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crash/x86_64.c
Dave Anderson e4cc9e7faf Fix for the X86_64 "bt" and "mach" commands when running against 
kernels that have the following Linux 3.18 commit, which removes the
special per-cpu exception stack for handling stack segment faults:

  commit 6f442be2fb22be02cafa606f1769fa1e6f894441
  x86_64, traps: Stop using IST for #SS

Without this patch, backtraces that originate on any of the other 4
per-cpu exception stacks will be mis-labeled at the transition point
back to the previous stack.  For example, backtraces that that
originate on the NMI stack will indicate that they are coming from
the "DOUBLEFAULT" stack.  The patch examines all idt_table entries
during initialization, looking for gate descriptors that have
non-zero index values, and when found, pulls out out the handler
function address; from that information, the exception stack name
string array is properly initialized rather than being hard-coded.
This fix also properly labels the exception stack names on x86_64
CONFIG_PREEMPT_RT realtime kernels, which only utilize 3 exception
stacks instead of the traditional 5 (now 4 with this kernel commit),
instead of just showing "RT".  Also, without the patch, the "mach"
command will mis-label the stack names when it displays the base
addresses of each per-cpu exception stack.
(anderson@redhat.com)
2014-12-15 15:23:52 -05:00

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/* x86_64.c -- core analysis suite
*
* Copyright (C) 2004-2014 David Anderson
* Copyright (C) 2004-2014 Red Hat, Inc. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include "defs.h"
#include "xen_hyper_defs.h"
#ifdef X86_64
static int x86_64_kvtop(struct task_context *, ulong, physaddr_t *, int);
static int x86_64_kvtop_xen_wpt(struct task_context *, ulong, physaddr_t *, int);
static int x86_64_uvtop(struct task_context *, ulong, physaddr_t *, int);
static int x86_64_uvtop_level4(struct task_context *, ulong, physaddr_t *, int);
static int x86_64_uvtop_level4_xen_wpt(struct task_context *, ulong, physaddr_t *, int);
static int x86_64_uvtop_level4_rhel4_xen_wpt(struct task_context *, ulong, physaddr_t *, int);
static ulong x86_64_vmalloc_start(void);
static int x86_64_is_task_addr(ulong);
static int x86_64_verify_symbol(const char *, ulong, char);
static int x86_64_verify_line_number(ulong, ulong, ulong);
static ulong x86_64_get_task_pgd(ulong);
static int x86_64_translate_pte(ulong, void *, ulonglong);
static ulong x86_64_processor_speed(void);
static int is_vsyscall_addr(ulong);
struct syment *x86_64_value_to_symbol(ulong, ulong *);
static int x86_64_eframe_search(struct bt_info *);
static int x86_64_eframe_verify(struct bt_info *, long, long, long, long, long, long);
#define EFRAME_PRINT (0x1)
#define EFRAME_VERIFY (0x2)
#define EFRAME_CS (0x4)
#define EFRAME_SEARCH (0x8)
static int x86_64_print_eframe_location(ulong, int, FILE *);
static void x86_64_back_trace_cmd(struct bt_info *);
static ulong x86_64_in_exception_stack(struct bt_info *, int *);
static ulong x86_64_in_irqstack(struct bt_info *);
static int x86_64_in_alternate_stack(int, ulong);
static ulong __schedule_frame_adjust(ulong, struct bt_info *);
static void x86_64_low_budget_back_trace_cmd(struct bt_info *);
static void x86_64_dwarf_back_trace_cmd(struct bt_info *);
static void x86_64_get_dumpfile_stack_frame(struct bt_info *, ulong *, ulong *);
static struct syment *x86_64_function_called_by(ulong);
static int is_direct_call_target(struct bt_info *);
static void get_x86_64_frame(struct bt_info *, ulong *, ulong *);
static ulong text_lock_function(char *, struct bt_info *, ulong);
static int x86_64_print_stack_entry(struct bt_info *, FILE *, int, int, ulong);
static void x86_64_display_full_frame(struct bt_info *, ulong, FILE *);
static void x86_64_do_bt_reference_check(struct bt_info *, ulong,char *);
static void x86_64_dump_irq(int);
static void x86_64_get_irq_affinity(int);
static void x86_64_show_interrupts(int, ulong *);
static char *x86_64_extract_idt_function(ulong *, char *, ulong *);
static ulong x86_64_get_pc(struct bt_info *);
static ulong x86_64_get_sp(struct bt_info *);
static void x86_64_get_stack_frame(struct bt_info *, ulong *, ulong *);
static int x86_64_dis_filter(ulong, char *, unsigned int);
static void x86_64_cmd_mach(void);
static int x86_64_get_smp_cpus(void);
static void x86_64_display_machine_stats(void);
static void x86_64_display_cpu_data(unsigned int);
static void x86_64_display_memmap(void);
static void x86_64_dump_line_number(ulong);
static struct line_number_hook x86_64_line_number_hooks[];
static void x86_64_calc_phys_base(void);
static int x86_64_is_module_addr(ulong);
static int x86_64_is_kvaddr(ulong);
static int x86_64_is_uvaddr(ulong, struct task_context *);
void x86_64_compiler_warning_stub(void);
static void x86_64_init_kernel_pgd(void);
static void x86_64_cpu_pda_init(void);
static void x86_64_per_cpu_init(void);
static void x86_64_ist_init(void);
static void x86_64_post_init(void);
static void parse_cmdline_args(void);
static void x86_64_clear_machdep_cache(void);
static void x86_64_irq_eframe_link_init(void);
static ulong x86_64_irq_eframe_link(ulong, struct bt_info *, FILE *);
static ulong search_for_switch_to(ulong, ulong);
static void x86_64_thread_return_init(void);
static void x86_64_framepointer_init(void);
static int x86_64_virt_phys_base(void);
static int x86_64_xendump_p2m_create(struct xendump_data *);
static int x86_64_pvops_xendump_p2m_create(struct xendump_data *);
static int x86_64_pvops_xendump_p2m_l2_create(struct xendump_data *);
static int x86_64_pvops_xendump_p2m_l3_create(struct xendump_data *);
static char *x86_64_xendump_load_page(ulong, struct xendump_data *);
static int x86_64_xendump_page_index(ulong, struct xendump_data *);
static int x86_64_xen_kdump_p2m_create(struct xen_kdump_data *);
static char *x86_64_xen_kdump_load_page(ulong, char *);
static ulong x86_64_xen_kdump_page_mfn(ulong);
static void x86_64_debug_dump_page(FILE *, char *, char *);
static void x86_64_get_xendump_regs(struct xendump_data *, struct bt_info *, ulong *, ulong *);
static ulong x86_64_xendump_panic_task(struct xendump_data *);
static void x86_64_init_hyper(int);
static ulong x86_64_get_stackbase_hyper(ulong);
static ulong x86_64_get_stacktop_hyper(ulong);
static int x86_64_framesize_cache_resize(void);
static int x86_64_framesize_cache_func(int, ulong, int *, int);
static ulong x86_64_get_framepointer(struct bt_info *, ulong);
int search_for_eframe_target_caller(struct bt_info *, ulong, int *);
static int x86_64_get_framesize(struct bt_info *, ulong, ulong);
static void x86_64_framesize_debug(struct bt_info *);
static void x86_64_get_active_set(void);
static int x86_64_get_kvaddr_ranges(struct vaddr_range *);
static int x86_64_verify_paddr(uint64_t);
static void GART_init(void);
static void x86_64_exception_stacks_init(void);
struct machine_specific x86_64_machine_specific = { 0 };
/*
* Do all necessary machine-specific setup here. This is called several
* times during initialization.
*/
void
x86_64_init(int when)
{
int len, dim;
if (XEN_HYPER_MODE()) {
x86_64_init_hyper(when);
return;
}
switch (when)
{
case SETUP_ENV:
machdep->process_elf_notes = x86_process_elf_notes;
break;
case PRE_SYMTAB:
machdep->verify_symbol = x86_64_verify_symbol;
machdep->verify_line_number = x86_64_verify_line_number;
machdep->machspec = &x86_64_machine_specific;
if (pc->flags & KERNEL_DEBUG_QUERY)
return;
machdep->pagesize = memory_page_size();
machdep->pageshift = ffs(machdep->pagesize) - 1;
machdep->pageoffset = machdep->pagesize - 1;
machdep->pagemask = ~((ulonglong)machdep->pageoffset);
machdep->stacksize = machdep->pagesize * 2;
if ((machdep->machspec->upml = (char *)malloc(PAGESIZE())) == NULL)
error(FATAL, "cannot malloc upml space.");
if ((machdep->pgd = (char *)malloc(PAGESIZE())) == NULL)
error(FATAL, "cannot malloc pgd space.");
if ((machdep->pmd = (char *)malloc(PAGESIZE())) == NULL)
error(FATAL, "cannot malloc pmd space.");
if ((machdep->ptbl = (char *)malloc(PAGESIZE())) == NULL)
error(FATAL, "cannot malloc ptbl space.");
if ((machdep->machspec->pml4 =
(char *)malloc(PAGESIZE()*2)) == NULL)
error(FATAL, "cannot malloc pml4 space.");
machdep->machspec->last_upml_read = 0;
machdep->machspec->last_pml4_read = 0;
machdep->last_pgd_read = 0;
machdep->last_pmd_read = 0;
machdep->last_ptbl_read = 0;
machdep->verify_paddr = x86_64_verify_paddr;
machdep->ptrs_per_pgd = PTRS_PER_PGD;
machdep->flags |= MACHDEP_BT_TEXT;
machdep->flags |= FRAMESIZE_DEBUG;
machdep->machspec->irq_eframe_link = UNINITIALIZED;
machdep->get_kvaddr_ranges = x86_64_get_kvaddr_ranges;
if (machdep->cmdline_args[0])
parse_cmdline_args();
break;
case PRE_GDB:
if (!(machdep->flags & VM_FLAGS)) {
if (symbol_exists("xen_start_info")) {
if (PVOPS())
machdep->flags |= VM_2_6_11;
else if (symbol_exists("low_pml4") &&
symbol_exists("swap_low_mappings"))
machdep->flags |= VM_XEN_RHEL4;
else
machdep->flags |= VM_XEN;
} else if (symbol_exists("boot_vmalloc_pgt"))
machdep->flags |= VM_ORIG;
else
machdep->flags |= VM_2_6_11;
}
switch (machdep->flags & VM_FLAGS)
{
case VM_ORIG:
/* pre-2.6.11 layout */
machdep->machspec->userspace_top = USERSPACE_TOP_ORIG;
machdep->machspec->page_offset = PAGE_OFFSET_ORIG;
machdep->machspec->vmalloc_start_addr = VMALLOC_START_ADDR_ORIG;
machdep->machspec->vmalloc_end = VMALLOC_END_ORIG;
machdep->machspec->modules_vaddr = MODULES_VADDR_ORIG;
machdep->machspec->modules_end = MODULES_END_ORIG;
free(machdep->machspec->upml);
machdep->machspec->upml = NULL;
machdep->uvtop = x86_64_uvtop;
break;
case VM_2_6_11:
/* 2.6.11 layout */
machdep->machspec->userspace_top = USERSPACE_TOP_2_6_11;
machdep->machspec->vmalloc_start_addr = VMALLOC_START_ADDR_2_6_11;
machdep->machspec->vmalloc_end = VMALLOC_END_2_6_11;
machdep->machspec->modules_vaddr = MODULES_VADDR_2_6_11;
machdep->machspec->modules_end = MODULES_END_2_6_11;
/* 2.6.24 layout */
machdep->machspec->vmemmap_vaddr = VMEMMAP_VADDR_2_6_24;
machdep->machspec->vmemmap_end = VMEMMAP_END_2_6_24;
if (symbol_exists("vmemmap_populate"))
machdep->flags |= VMEMMAP;
if (kernel_symbol_exists("end_pfn"))
/* 2.6.11 layout */
machdep->machspec->page_offset = PAGE_OFFSET_2_6_11;
else
/* 2.6.27 layout */
machdep->machspec->page_offset = PAGE_OFFSET_2_6_27;
machdep->uvtop = x86_64_uvtop_level4;
break;
case VM_XEN:
/* Xen layout */
machdep->machspec->userspace_top = USERSPACE_TOP_XEN;
machdep->machspec->page_offset = PAGE_OFFSET_XEN;
machdep->machspec->vmalloc_start_addr = VMALLOC_START_ADDR_XEN;
machdep->machspec->vmalloc_end = VMALLOC_END_XEN;
machdep->machspec->modules_vaddr = MODULES_VADDR_XEN;
machdep->machspec->modules_end = MODULES_END_XEN;
break;
case VM_XEN_RHEL4:
/* RHEL4 Xen layout */
machdep->machspec->userspace_top = USERSPACE_TOP_XEN_RHEL4;
machdep->machspec->page_offset = PAGE_OFFSET_XEN_RHEL4;
machdep->machspec->vmalloc_start_addr = VMALLOC_START_ADDR_XEN_RHEL4;
machdep->machspec->vmalloc_end = VMALLOC_END_XEN_RHEL4;
machdep->machspec->modules_vaddr = MODULES_VADDR_XEN_RHEL4;
machdep->machspec->modules_end = MODULES_END_XEN_RHEL4;
break;
}
machdep->kvbase = (ulong)PAGE_OFFSET;
machdep->identity_map_base = (ulong)PAGE_OFFSET;
machdep->is_kvaddr = x86_64_is_kvaddr;
machdep->is_uvaddr = x86_64_is_uvaddr;
machdep->eframe_search = x86_64_eframe_search;
machdep->back_trace = x86_64_low_budget_back_trace_cmd;
machdep->processor_speed = x86_64_processor_speed;
machdep->kvtop = x86_64_kvtop;
machdep->get_task_pgd = x86_64_get_task_pgd;
machdep->get_stack_frame = x86_64_get_stack_frame;
machdep->get_stackbase = generic_get_stackbase;
machdep->get_stacktop = generic_get_stacktop;
machdep->translate_pte = x86_64_translate_pte;
machdep->memory_size = generic_memory_size;
machdep->is_task_addr = x86_64_is_task_addr;
machdep->dis_filter = x86_64_dis_filter;
machdep->cmd_mach = x86_64_cmd_mach;
machdep->get_smp_cpus = x86_64_get_smp_cpus;
machdep->value_to_symbol = x86_64_value_to_symbol;
machdep->init_kernel_pgd = x86_64_init_kernel_pgd;
machdep->clear_machdep_cache = x86_64_clear_machdep_cache;
machdep->xendump_p2m_create = x86_64_xendump_p2m_create;
machdep->get_xendump_regs = x86_64_get_xendump_regs;
machdep->xen_kdump_p2m_create = x86_64_xen_kdump_p2m_create;
machdep->xendump_panic_task = x86_64_xendump_panic_task;
if (symbol_exists("vgettimeofday"))
machdep->machspec->vsyscall_page =
PAGEBASE(symbol_value("vgettimeofday"));
x86_64_calc_phys_base();
break;
case POST_GDB:
if (THIS_KERNEL_VERSION >= LINUX(2,6,26) &&
THIS_KERNEL_VERSION < LINUX(2,6,31)) {
machdep->machspec->modules_vaddr = MODULES_VADDR_2_6_26;
}
if (THIS_KERNEL_VERSION >= LINUX(2,6,27) &&
THIS_KERNEL_VERSION < LINUX(2,6,31)) {
machdep->machspec->modules_end = MODULES_END_2_6_27;
}
if (THIS_KERNEL_VERSION >= LINUX(2,6,31)) {
machdep->machspec->vmalloc_start_addr = VMALLOC_START_ADDR_2_6_31;
machdep->machspec->vmalloc_end = VMALLOC_END_2_6_31;
machdep->machspec->vmemmap_vaddr = VMEMMAP_VADDR_2_6_31;
machdep->machspec->vmemmap_end = VMEMMAP_END_2_6_31;
machdep->machspec->modules_vaddr = MODULES_VADDR_2_6_31;
machdep->machspec->modules_end = MODULES_END_2_6_31;
}
STRUCT_SIZE_INIT(cpuinfo_x86, "cpuinfo_x86");
/*
* Before 2.6.25 the structure was called gate_struct
*/
if (STRUCT_EXISTS("gate_desc"))
STRUCT_SIZE_INIT(gate_struct, "gate_desc");
else
STRUCT_SIZE_INIT(gate_struct, "gate_struct");
STRUCT_SIZE_INIT(e820map, "e820map");
STRUCT_SIZE_INIT(e820entry, "e820entry");
MEMBER_OFFSET_INIT(e820map_nr_map, "e820map", "nr_map");
MEMBER_OFFSET_INIT(e820entry_addr, "e820entry", "addr");
MEMBER_OFFSET_INIT(e820entry_size, "e820entry", "size");
MEMBER_OFFSET_INIT(e820entry_type, "e820entry", "type");
if (KVMDUMP_DUMPFILE())
set_kvm_iohole(NULL);
MEMBER_OFFSET_INIT(thread_struct_rip, "thread_struct", "rip");
MEMBER_OFFSET_INIT(thread_struct_rsp, "thread_struct", "rsp");
MEMBER_OFFSET_INIT(thread_struct_rsp0, "thread_struct", "rsp0");
if (INVALID_MEMBER(thread_struct_rip))
MEMBER_OFFSET_INIT(thread_struct_rip, "thread_struct", "ip");
if (INVALID_MEMBER(thread_struct_rsp))
MEMBER_OFFSET_INIT(thread_struct_rsp, "thread_struct", "sp");
if (INVALID_MEMBER(thread_struct_rsp0))
MEMBER_OFFSET_INIT(thread_struct_rsp0, "thread_struct", "sp0");
STRUCT_SIZE_INIT(tss_struct, "tss_struct");
MEMBER_OFFSET_INIT(tss_struct_ist, "tss_struct", "ist");
if (INVALID_MEMBER(tss_struct_ist)) {
long x86_tss_offset, ist_offset;
x86_tss_offset = MEMBER_OFFSET("tss_struct", "x86_tss");
ist_offset = MEMBER_OFFSET("x86_hw_tss", "ist");
if ((x86_tss_offset != INVALID_OFFSET) &&
(ist_offset != INVALID_OFFSET))
ASSIGN_OFFSET(tss_struct_ist) = x86_tss_offset +
ist_offset;
}
MEMBER_OFFSET_INIT(user_regs_struct_rip,
"user_regs_struct", "rip");
if (INVALID_MEMBER(user_regs_struct_rip))
MEMBER_OFFSET_INIT(user_regs_struct_rip,
"user_regs_struct", "ip");
MEMBER_OFFSET_INIT(user_regs_struct_rsp,
"user_regs_struct", "rsp");
if (INVALID_MEMBER(user_regs_struct_rsp))
MEMBER_OFFSET_INIT(user_regs_struct_rsp,
"user_regs_struct", "sp");
MEMBER_OFFSET_INIT(user_regs_struct_eflags,
"user_regs_struct", "eflags");
if (INVALID_MEMBER(user_regs_struct_eflags))
MEMBER_OFFSET_INIT(user_regs_struct_eflags,
"user_regs_struct", "flags");
MEMBER_OFFSET_INIT(user_regs_struct_cs,
"user_regs_struct", "cs");
MEMBER_OFFSET_INIT(user_regs_struct_ss,
"user_regs_struct", "ss");
MEMBER_OFFSET_INIT(user_regs_struct_rax,
"user_regs_struct", "rax");
if (INVALID_MEMBER(user_regs_struct_rax))
MEMBER_OFFSET_INIT(user_regs_struct_rax,
"user_regs_struct", "ax");
MEMBER_OFFSET_INIT(user_regs_struct_rbx,
"user_regs_struct", "rbx");
if (INVALID_MEMBER(user_regs_struct_rbx))
MEMBER_OFFSET_INIT(user_regs_struct_rbx,
"user_regs_struct", "bx");
MEMBER_OFFSET_INIT(user_regs_struct_rcx,
"user_regs_struct", "rcx");
if (INVALID_MEMBER(user_regs_struct_rcx))
MEMBER_OFFSET_INIT(user_regs_struct_rcx,
"user_regs_struct", "cx");
MEMBER_OFFSET_INIT(user_regs_struct_rdx,
"user_regs_struct", "rdx");
if (INVALID_MEMBER(user_regs_struct_rdx))
MEMBER_OFFSET_INIT(user_regs_struct_rdx,
"user_regs_struct", "dx");
MEMBER_OFFSET_INIT(user_regs_struct_rsi,
"user_regs_struct", "rsi");
if (INVALID_MEMBER(user_regs_struct_rsi))
MEMBER_OFFSET_INIT(user_regs_struct_rsi,
"user_regs_struct", "si");
MEMBER_OFFSET_INIT(user_regs_struct_rdi,
"user_regs_struct", "rdi");
if (INVALID_MEMBER(user_regs_struct_rdi))
MEMBER_OFFSET_INIT(user_regs_struct_rdi,
"user_regs_struct", "di");
MEMBER_OFFSET_INIT(user_regs_struct_rbp,
"user_regs_struct", "rbp");
if (INVALID_MEMBER(user_regs_struct_rbp))
MEMBER_OFFSET_INIT(user_regs_struct_rbp,
"user_regs_struct", "bp");
MEMBER_OFFSET_INIT(user_regs_struct_r8,
"user_regs_struct", "r8");
MEMBER_OFFSET_INIT(user_regs_struct_r9,
"user_regs_struct", "r9");
MEMBER_OFFSET_INIT(user_regs_struct_r10,
"user_regs_struct", "r10");
MEMBER_OFFSET_INIT(user_regs_struct_r11,
"user_regs_struct", "r11");
MEMBER_OFFSET_INIT(user_regs_struct_r12,
"user_regs_struct", "r12");
MEMBER_OFFSET_INIT(user_regs_struct_r13,
"user_regs_struct", "r13");
MEMBER_OFFSET_INIT(user_regs_struct_r14,
"user_regs_struct", "r14");
MEMBER_OFFSET_INIT(user_regs_struct_r15,
"user_regs_struct", "r15");
STRUCT_SIZE_INIT(user_regs_struct, "user_regs_struct");
if (!VALID_STRUCT(user_regs_struct)) {
/* Use this hardwired version -- sometimes the
* debuginfo doesn't pick this up even though
* it exists in the kernel; it shouldn't change.
*/
struct x86_64_user_regs_struct {
unsigned long r15, r14, r13, r12, bp, bx;
unsigned long r11, r10, r9, r8, ax, cx, dx;
unsigned long si, di, orig_ax, ip, cs;
unsigned long flags, sp, ss, fs_base;
unsigned long gs_base, ds, es, fs, gs;
};
ASSIGN_SIZE(user_regs_struct) =
sizeof(struct x86_64_user_regs_struct);
ASSIGN_OFFSET(user_regs_struct_rip) =
offsetof(struct x86_64_user_regs_struct, ip);
ASSIGN_OFFSET(user_regs_struct_rsp) =
offsetof(struct x86_64_user_regs_struct, sp);
ASSIGN_OFFSET(user_regs_struct_eflags) =
offsetof(struct x86_64_user_regs_struct, flags);
ASSIGN_OFFSET(user_regs_struct_cs) =
offsetof(struct x86_64_user_regs_struct, cs);
ASSIGN_OFFSET(user_regs_struct_ss) =
offsetof(struct x86_64_user_regs_struct, ss);
ASSIGN_OFFSET(user_regs_struct_rax) =
offsetof(struct x86_64_user_regs_struct, ax);
ASSIGN_OFFSET(user_regs_struct_rbx) =
offsetof(struct x86_64_user_regs_struct, bx);
ASSIGN_OFFSET(user_regs_struct_rcx) =
offsetof(struct x86_64_user_regs_struct, cx);
ASSIGN_OFFSET(user_regs_struct_rdx) =
offsetof(struct x86_64_user_regs_struct, dx);
ASSIGN_OFFSET(user_regs_struct_rsi) =
offsetof(struct x86_64_user_regs_struct, si);
ASSIGN_OFFSET(user_regs_struct_rdi) =
offsetof(struct x86_64_user_regs_struct, di);
ASSIGN_OFFSET(user_regs_struct_rbp) =
offsetof(struct x86_64_user_regs_struct, bp);
ASSIGN_OFFSET(user_regs_struct_r8) =
offsetof(struct x86_64_user_regs_struct, r8);
ASSIGN_OFFSET(user_regs_struct_r9) =
offsetof(struct x86_64_user_regs_struct, r9);
ASSIGN_OFFSET(user_regs_struct_r10) =
offsetof(struct x86_64_user_regs_struct, r10);
ASSIGN_OFFSET(user_regs_struct_r11) =
offsetof(struct x86_64_user_regs_struct, r11);
ASSIGN_OFFSET(user_regs_struct_r12) =
offsetof(struct x86_64_user_regs_struct, r12);
ASSIGN_OFFSET(user_regs_struct_r13) =
offsetof(struct x86_64_user_regs_struct, r13);
ASSIGN_OFFSET(user_regs_struct_r14) =
offsetof(struct x86_64_user_regs_struct, r14);
ASSIGN_OFFSET(user_regs_struct_r15) =
offsetof(struct x86_64_user_regs_struct, r15);
}
machdep->vmalloc_start = x86_64_vmalloc_start;
vt->vmalloc_start = machdep->vmalloc_start();
machdep->init_kernel_pgd();
if (STRUCT_EXISTS("x8664_pda"))
x86_64_cpu_pda_init();
else
x86_64_per_cpu_init();
x86_64_ist_init();
if (symbol_exists("repeat_nmi"))
machdep->flags |= NESTED_NMI;
machdep->in_alternate_stack = x86_64_in_alternate_stack;
if ((machdep->machspec->irqstack = (char *)
malloc(machdep->machspec->stkinfo.isize)) == NULL)
error(FATAL, "cannot malloc irqstack space.");
if (symbol_exists("irq_desc")) {
if (LKCD_KERNTYPES())
ARRAY_LENGTH_INIT_ALT(machdep->nr_irqs,
"irq_desc", "kernel_stat.irqs", NULL, 0);
else
ARRAY_LENGTH_INIT(machdep->nr_irqs, irq_desc,
"irq_desc", NULL, 0);
} else if (kernel_symbol_exists("nr_irqs"))
get_symbol_data("nr_irqs", sizeof(unsigned int),
&machdep->nr_irqs);
else
machdep->nr_irqs = 224; /* NR_IRQS (at least) */
machdep->dump_irq = x86_64_dump_irq;
machdep->get_irq_affinity = x86_64_get_irq_affinity;
machdep->show_interrupts = x86_64_show_interrupts;
if (THIS_KERNEL_VERSION < LINUX(2,6,24))
machdep->line_number_hooks = x86_64_line_number_hooks;
if (!machdep->hz) {
machdep->hz = HZ;
if (THIS_KERNEL_VERSION >= LINUX(2,6,0))
machdep->hz = 1000;
}
machdep->section_size_bits = _SECTION_SIZE_BITS;
if (!machdep->max_physmem_bits) {
if (THIS_KERNEL_VERSION >= LINUX(2,6,31))
machdep->max_physmem_bits =
_MAX_PHYSMEM_BITS_2_6_31;
else if (THIS_KERNEL_VERSION >= LINUX(2,6,26))
machdep->max_physmem_bits =
_MAX_PHYSMEM_BITS_2_6_26;
else {
machdep->max_physmem_bits = _MAX_PHYSMEM_BITS;
len = get_array_length("mem_section", &dim, 0);
/*
* Check for patched MAX_PHYSMEM_BITS.
*/
if (((len > 32) && !dim) ||
((len > 8192) && (dim == 1)))
machdep->max_physmem_bits =
_MAX_PHYSMEM_BITS_2_6_26;
}
}
if (XEN()) {
if (kt->xen_flags & WRITABLE_PAGE_TABLES) {
switch (machdep->flags & VM_FLAGS)
{
case VM_XEN:
case VM_2_6_11:
machdep->uvtop = x86_64_uvtop_level4_xen_wpt;
break;
case VM_XEN_RHEL4:
machdep->uvtop = x86_64_uvtop_level4_rhel4_xen_wpt;
break;
}
} else
machdep->uvtop = x86_64_uvtop_level4;
MEMBER_OFFSET_INIT(vcpu_guest_context_user_regs,
"vcpu_guest_context", "user_regs");
ASSIGN_OFFSET(cpu_user_regs_rsp) =
MEMBER_OFFSET("cpu_user_regs", "ss") - sizeof(ulong);
ASSIGN_OFFSET(cpu_user_regs_rip) =
MEMBER_OFFSET("cpu_user_regs", "cs") - sizeof(ulong);
}
x86_64_irq_eframe_link_init();
x86_64_framepointer_init();
x86_64_thread_return_init();
if (THIS_KERNEL_VERSION >= LINUX(2,6,28))
machdep->machspec->page_protnone = _PAGE_GLOBAL;
else
machdep->machspec->page_protnone = _PAGE_PSE;
STRUCT_SIZE_INIT(note_buf, "note_buf_t");
STRUCT_SIZE_INIT(elf_prstatus, "elf_prstatus");
MEMBER_OFFSET_INIT(elf_prstatus_pr_reg, "elf_prstatus",
"pr_reg");
STRUCT_SIZE_INIT(percpu_data, "percpu_data");
GART_init();
break;
case POST_VM:
init_unwind_table();
break;
case POST_INIT:
x86_64_post_init();
x86_64_get_active_set();
break;
case LOG_ONLY:
machdep->machspec = &x86_64_machine_specific;
x86_64_calc_phys_base();
break;
}
}
void
x86_64_dump_machdep_table(ulong arg)
{
int c, i, cpus;
int others;
struct machine_specific *ms;
ms = machdep->machspec;
others = 0;
fprintf(fp, " flags: %lx (", machdep->flags);
if (machdep->flags & KSYMS_START)
fprintf(fp, "%sKSYMS_START", others++ ? "|" : "");
if (machdep->flags & PT_REGS_INIT)
fprintf(fp, "%sPT_REGS_INIT", others++ ? "|" : "");
if (machdep->flags & MACHDEP_BT_TEXT)
fprintf(fp, "%sMACHDEP_BT_TEXT", others++ ? "|" : "");
if (machdep->flags & VM_ORIG)
fprintf(fp, "%sVM_ORIG", others++ ? "|" : "");
if (machdep->flags & VM_2_6_11)
fprintf(fp, "%sVM_2_6_11", others++ ? "|" : "");
if (machdep->flags & VM_XEN)
fprintf(fp, "%sVM_XEN", others++ ? "|" : "");
if (machdep->flags & VM_XEN_RHEL4)
fprintf(fp, "%sVM_XEN_RHEL4", others++ ? "|" : "");
if (machdep->flags & VMEMMAP)
fprintf(fp, "%sVMEMMAP", others++ ? "|" : "");
if (machdep->flags & NO_TSS)
fprintf(fp, "%sNO_TSS", others++ ? "|" : "");
if (machdep->flags & SCHED_TEXT)
fprintf(fp, "%sSCHED_TEXT", others++ ? "|" : "");
if (machdep->flags & PHYS_BASE)
fprintf(fp, "%sPHYS_BASE", others++ ? "|" : "");
if (machdep->flags & FRAMESIZE_DEBUG)
fprintf(fp, "%sFRAMESIZE_DEBUG", others++ ? "|" : "");
if (machdep->flags & FRAMEPOINTER)
fprintf(fp, "%sFRAMEPOINTER", others++ ? "|" : "");
if (machdep->flags & GART_REGION)
fprintf(fp, "%sGART_REGION", others++ ? "|" : "");
if (machdep->flags & NESTED_NMI)
fprintf(fp, "%sNESTED_NMI", others++ ? "|" : "");
fprintf(fp, ")\n");
fprintf(fp, " kvbase: %lx\n", machdep->kvbase);
fprintf(fp, " identity_map_base: %lx\n", machdep->kvbase);
fprintf(fp, " pagesize: %d\n", machdep->pagesize);
fprintf(fp, " pageshift: %d\n", machdep->pageshift);
fprintf(fp, " pagemask: %llx\n", machdep->pagemask);
fprintf(fp, " pageoffset: %lx\n", machdep->pageoffset);
fprintf(fp, " stacksize: %ld\n", machdep->stacksize);
fprintf(fp, " hz: %d\n", machdep->hz);
fprintf(fp, " mhz: %ld\n", machdep->mhz);
fprintf(fp, " memsize: %llu (0x%llx)\n",
(ulonglong)machdep->memsize, (ulonglong)machdep->memsize);
fprintf(fp, " bits: %d\n", machdep->bits);
fprintf(fp, " nr_irqs: %d\n", machdep->nr_irqs);
fprintf(fp, " eframe_search: x86_64_eframe_search()\n");
if (machdep->back_trace == x86_64_back_trace_cmd)
fprintf(fp, " back_trace: x86_64_back_trace_cmd()\n");
else if (machdep->back_trace == x86_64_low_budget_back_trace_cmd)
fprintf(fp,
" back_trace: x86_64_low_budget_back_trace_cmd() %s\n",
kt->flags & DWARF_UNWIND ?
"-> x86_64_dwarf_back_trace_cmd()" : "");
else if (machdep->back_trace == x86_64_dwarf_back_trace_cmd)
fprintf(fp,
" back_trace: x86_64_dwarf_back_trace_cmd() %s\n",
kt->flags & DWARF_UNWIND ?
"" : "->x86_64_low_budget_back_trace_cmd()");
else
fprintf(fp, " back_trace: %lx\n",
(ulong)machdep->back_trace);
fprintf(fp, " processor_speed: x86_64_processor_speed()\n");
if (machdep->uvtop == x86_64_uvtop)
fprintf(fp, " uvtop: x86_64_uvtop()\n");
else if (machdep->uvtop == x86_64_uvtop_level4)
fprintf(fp, " uvtop: x86_64_uvtop_level4()\n");
else if (machdep->uvtop == x86_64_uvtop_level4_xen_wpt)
fprintf(fp, " uvtop: x86_64_uvtop_level4_xen_wpt()\n");
else if (machdep->uvtop == x86_64_uvtop_level4_rhel4_xen_wpt)
fprintf(fp, " uvtop: x86_64_uvtop_level4_rhel4_xen_wpt()\n");
else
fprintf(fp, " uvtop: %lx\n", (ulong)machdep->uvtop);
fprintf(fp, " kvtop: x86_64_kvtop()");
if (XEN() && (kt->xen_flags & WRITABLE_PAGE_TABLES))
fprintf(fp, " -> x86_64_kvtop_xen_wpt()");
fprintf(fp, "\n");
fprintf(fp, " get_task_pgd: x86_64_get_task_pgd()\n");
fprintf(fp, " dump_irq: x86_64_dump_irq()\n");
fprintf(fp, " get_irq_affinity: x86_64_get_irq_affinity()\n");
fprintf(fp, " show_interrupts: x86_64_show_interrupts()\n");
fprintf(fp, " get_stack_frame: x86_64_get_stack_frame()\n");
fprintf(fp, " get_stackbase: generic_get_stackbase()\n");
fprintf(fp, " get_stacktop: generic_get_stacktop()\n");
fprintf(fp, " translate_pte: x86_64_translate_pte()\n");
fprintf(fp, " memory_size: generic_memory_size()\n");
fprintf(fp, " vmalloc_start: x86_64_vmalloc_start()\n");
fprintf(fp, " is_task_addr: x86_64_is_task_addr()\n");
fprintf(fp, " verify_symbol: x86_64_verify_symbol()\n");
fprintf(fp, " dis_filter: x86_64_dis_filter()\n");
fprintf(fp, " cmd_mach: x86_64_cmd_mach()\n");
fprintf(fp, " get_smp_cpus: x86_64_get_smp_cpus()\n");
fprintf(fp, " is_kvaddr: x86_64_is_kvaddr()\n");
fprintf(fp, " is_uvaddr: x86_64_is_uvaddr()\n");
fprintf(fp, " verify_paddr: x86_64_verify_paddr()\n");
fprintf(fp, " get_kvaddr_ranges: x86_64_get_kvaddr_ranges()\n");
fprintf(fp, " init_kernel_pgd: x86_64_init_kernel_pgd()\n");
fprintf(fp, "clear_machdep_cache: x86_64_clear_machdep_cache()\n");
fprintf(fp, " xendump_p2m_create: %s\n", PVOPS_XEN() ?
"x86_64_pvops_xendump_p2m_create()" :
"x86_64_xendump_p2m_create()");
fprintf(fp, " get_xendump_regs: x86_64_get_xendump_regs()\n");
fprintf(fp, " xendump_panic_task: x86_64_xendump_panic_task()\n");
fprintf(fp, "xen_kdump_p2m_create: x86_64_xen_kdump_p2m_create()\n");
fprintf(fp, " line_number_hooks: %s\n", machdep->line_number_hooks ?
"x86_64_line_number_hooks" : "(unused)");
fprintf(fp, " verify_line_number: x86_64_verify_line_number()\n");
fprintf(fp, " value_to_symbol: x86_64_value_to_symbol()\n");
fprintf(fp, " in_alternate_stack: x86_64_in_alternate_stack()\n");
fprintf(fp, " last_pgd_read: %lx\n", machdep->last_pgd_read);
fprintf(fp, " last_pmd_read: %lx\n", machdep->last_pmd_read);
fprintf(fp, " last_ptbl_read: %lx\n", machdep->last_ptbl_read);
fprintf(fp, " pgd: %lx\n", (ulong)machdep->pgd);
fprintf(fp, " pmd: %lx\n", (ulong)machdep->pmd);
fprintf(fp, " ptbl: %lx\n", (ulong)machdep->ptbl);
fprintf(fp, " ptrs_per_pgd: %d\n", machdep->ptrs_per_pgd);
fprintf(fp, " section_size_bits: %ld\n", machdep->section_size_bits);
fprintf(fp, " max_physmem_bits: %ld\n", machdep->max_physmem_bits);
fprintf(fp, " sections_per_root: %ld\n", machdep->sections_per_root);
for (i = 0; i < MAX_MACHDEP_ARGS; i++) {
fprintf(fp, " cmdline_args[%d]: %s\n",
i, machdep->cmdline_args[i] ?
machdep->cmdline_args[i] : "(unused)");
}
fprintf(fp, " machspec: %016lx\n", (ulong)machdep->machspec);
fprintf(fp, " userspace_top: %016lx\n", (ulong)ms->userspace_top);
fprintf(fp, " page_offset: %016lx\n", (ulong)ms->page_offset);
fprintf(fp, " vmalloc_start_addr: %016lx\n", (ulong)ms->vmalloc_start_addr);
fprintf(fp, " vmalloc_end: %016lx\n", (ulong)ms->vmalloc_end);
fprintf(fp, " modules_vaddr: %016lx\n", (ulong)ms->modules_vaddr);
fprintf(fp, " modules_end: %016lx\n", (ulong)ms->modules_end);
fprintf(fp, " vmemmap_vaddr: %016lx %s\n", (ulong)ms->vmemmap_vaddr,
machdep->flags & VMEMMAP ? "" : "(unused)");
fprintf(fp, " vmemmap_end: %016lx %s\n", (ulong)ms->vmemmap_end,
machdep->flags & VMEMMAP ? "" : "(unused)");
fprintf(fp, " phys_base: %lx\n", (ulong)ms->phys_base);
fprintf(fp, " GART_start: %lx\n", ms->GART_start);
fprintf(fp, " GART_end: %lx\n", ms->GART_end);
fprintf(fp, " pml4: %lx\n", (ulong)ms->pml4);
fprintf(fp, " last_pml4_read: %lx\n", (ulong)ms->last_pml4_read);
if (ms->upml) {
fprintf(fp, " upml: %lx\n", (ulong)ms->upml);
fprintf(fp, " last_upml_read: %lx\n", (ulong)ms->last_upml_read);
} else {
fprintf(fp, " upml: (unused)\n");
fprintf(fp, " last_upml_read: (unused)\n");
}
fprintf(fp, " irqstack: %lx\n", (ulong)ms->irqstack);
fprintf(fp, " irq_eframe_link: %ld\n", ms->irq_eframe_link);
fprintf(fp, " pto: %s",
machdep->flags & PT_REGS_INIT ? "\n" : "(uninitialized)\n");
if (machdep->flags & PT_REGS_INIT) {
fprintf(fp, " r15: %ld\n", ms->pto.r15);
fprintf(fp, " r14: %ld\n", ms->pto.r14);
fprintf(fp, " r13: %ld\n", ms->pto.r13);
fprintf(fp, " r12: %ld\n", ms->pto.r12);
fprintf(fp, " rbp: %ld\n", ms->pto.rbp);
fprintf(fp, " rbx: %ld\n", ms->pto.rbx);
fprintf(fp, " r11: %ld\n", ms->pto.r11);
fprintf(fp, " r10: %ld\n", ms->pto.r10);
fprintf(fp, " r9: %ld\n", ms->pto.r9);
fprintf(fp, " r8: %ld\n", ms->pto.r8);
fprintf(fp, " rax: %ld\n", ms->pto.rax);
fprintf(fp, " rcx: %ld\n", ms->pto.rcx);
fprintf(fp, " rdx: %ld\n", ms->pto.rdx);
fprintf(fp, " rsi: %ld\n", ms->pto.rsi);
fprintf(fp, " rdi: %ld\n", ms->pto.rdi);
fprintf(fp, " orig_rax: %ld\n", ms->pto.orig_rax);
fprintf(fp, " rip: %ld\n", ms->pto.rip);
fprintf(fp, " cs: %ld\n", ms->pto.cs);
fprintf(fp, " eflags: %ld\n", ms->pto.eflags);
fprintf(fp, " rsp: %ld\n", ms->pto.rsp);
fprintf(fp, " ss: %ld\n", ms->pto.ss);
}
#define CPU_SPACES(C) \
((C) < 10 ? 3 : (C) < 100 ? 2 : (C) < 1000 ? 1 : 0)
fprintf(fp, "%s current[%d]:%s",
space(CPU_SPACES(kt->cpus)), kt->cpus,
ms->current ? "\n " : " (unused)\n");
for (c = 0; ms->current && (c < kt->cpus); c++) {
if (c && !(c%4))
fprintf(fp, "\n ");
fprintf(fp, "%016lx ", ms->current[c]);
}
if (ms->current)
fprintf(fp, "\n");
fprintf(fp, "%s crash_nmi_rsp[%d]:%s",
space(CPU_SPACES(kt->cpus)), kt->cpus,
ms->crash_nmi_rsp ? "\n " : " (unused)\n");
for (c = 0; ms->crash_nmi_rsp && (c < kt->cpus); c++) {
if (c && !(c%4))
fprintf(fp, "\n ");
fprintf(fp, "%016lx ", ms->crash_nmi_rsp[c]);
}
if (ms->crash_nmi_rsp)
fprintf(fp, "\n");
fprintf(fp, " vsyscall_page: %lx\n", ms->vsyscall_page);
fprintf(fp, " thread_return: %lx\n", ms->thread_return);
fprintf(fp, " page_protnone: %lx\n", ms->page_protnone);
fprintf(fp, " stkinfo: isize: %d\n",
ms->stkinfo.isize);
fprintf(fp, " esize[%d]: %d,%d,%d,%d,%d,%d,%d%s\n",
MAX_EXCEPTION_STACKS,
ms->stkinfo.esize[0],
ms->stkinfo.esize[1],
ms->stkinfo.esize[2],
ms->stkinfo.esize[3],
ms->stkinfo.esize[4],
ms->stkinfo.esize[5],
ms->stkinfo.esize[6],
machdep->flags & NO_TSS ? " (NO TSS) " : " ");
fprintf(fp, " NMI_stack_index: %d\n",
ms->stkinfo.NMI_stack_index);
fprintf(fp, " exception_stacks:\n");
for (i = 0; i < MAX_EXCEPTION_STACKS; i++)
fprintf(fp, " [%d]: %s\n", i,
ms->stkinfo.exception_stacks[i]);
fprintf(fp, " ebase[%s][%d]:",
arg ? "NR_CPUS" : "cpus", MAX_EXCEPTION_STACKS);
cpus = arg ? NR_CPUS : kt->cpus;
for (c = 0; c < cpus; c++) {
fprintf(fp, "\n %s[%d]: ", c < 10 ? " " : "", c);
for (i = 0; i < MAX_EXCEPTION_STACKS; i++) {
fprintf(fp, "%016lx ", ms->stkinfo.ebase[c][i]);
if (i == 3)
fprintf(fp, "\n ");
}
}
fprintf(fp, "\n ibase[%s]:\n ",
arg ? "NR_CPUS" : "cpus");
for (c = 0; c < cpus; c++) {
if (c && !(c%4))
fprintf(fp, "\n ");
fprintf(fp, "%016lx ", ms->stkinfo.ibase[c]);
}
fprintf(fp, "\n");
}
/*
* Gather the cpu_pda array info, updating any smp-related items that
* were possibly bypassed or improperly initialized in kernel_init().
*/
static void
x86_64_cpu_pda_init(void)
{
int i, cpus, nr_pda, cpunumber, _cpu_pda, _boot_cpu_pda;
char *cpu_pda_buf;
ulong level4_pgt, data_offset, cpu_pda_addr;
struct syment *sp, *nsp;
ulong offset, istacksize;
_boot_cpu_pda = FALSE;
level4_pgt = 0;
STRUCT_SIZE_INIT(x8664_pda, "x8664_pda");
MEMBER_OFFSET_INIT(x8664_pda_pcurrent, "x8664_pda", "pcurrent");
MEMBER_OFFSET_INIT(x8664_pda_data_offset, "x8664_pda", "data_offset");
MEMBER_OFFSET_INIT(x8664_pda_kernelstack, "x8664_pda", "kernelstack");
MEMBER_OFFSET_INIT(x8664_pda_irqrsp, "x8664_pda", "irqrsp");
MEMBER_OFFSET_INIT(x8664_pda_irqstackptr, "x8664_pda", "irqstackptr");
MEMBER_OFFSET_INIT(x8664_pda_level4_pgt, "x8664_pda", "level4_pgt");
MEMBER_OFFSET_INIT(x8664_pda_cpunumber, "x8664_pda", "cpunumber");
MEMBER_OFFSET_INIT(x8664_pda_me, "x8664_pda", "me");
cpu_pda_buf = GETBUF(SIZE(x8664_pda));
if (LKCD_KERNTYPES()) {
if (symbol_exists("_cpu_pda"))
_cpu_pda = TRUE;
else
_cpu_pda = FALSE;
nr_pda = get_cpus_possible();
} else {
if (symbol_exists("_cpu_pda")) {
if (!(nr_pda = get_array_length("_cpu_pda", NULL, 0)))
nr_pda = NR_CPUS;
_cpu_pda = TRUE;
} else {
if (!(nr_pda = get_array_length("cpu_pda", NULL, 0)))
nr_pda = NR_CPUS;
_cpu_pda = FALSE;
}
}
if (_cpu_pda) {
if (symbol_exists("_boot_cpu_pda"))
_boot_cpu_pda = TRUE;
else
_boot_cpu_pda = FALSE;
}
if (DUMPFILE() &&
!(machdep->machspec->current = calloc(nr_pda, sizeof(ulong))))
error(FATAL, "cannot calloc %d x86_64 current pointers!\n",
nr_pda);
for (i = cpus = 0; i < nr_pda; i++) {
if (_cpu_pda) {
if (_boot_cpu_pda) {
if (!_CPU_PDA_READ2(i, cpu_pda_buf))
break;
} else {
if (!_CPU_PDA_READ(i, cpu_pda_buf))
break;
}
} else {
if (!CPU_PDA_READ(i, cpu_pda_buf))
break;
}
if (VALID_MEMBER(x8664_pda_level4_pgt)) {
level4_pgt = ULONG(cpu_pda_buf + OFFSET(x8664_pda_level4_pgt));
if (!VALID_LEVEL4_PGT_ADDR(level4_pgt))
break;
}
cpunumber = INT(cpu_pda_buf + OFFSET(x8664_pda_cpunumber));
if (cpunumber != cpus)
break;
cpus++;
if (VALID_MEMBER(x8664_pda_data_offset)) {
data_offset = ULONG(cpu_pda_buf +
OFFSET(x8664_pda_data_offset));
kt->__per_cpu_offset[i] = data_offset;
kt->flags |= PER_CPU_OFF;
} else
data_offset = 0;
machdep->machspec->stkinfo.ibase[i] = ULONG(cpu_pda_buf +
OFFSET(x8664_pda_irqstackptr));
if (DUMPFILE())
machdep->machspec->current[i] = ULONG(cpu_pda_buf +
OFFSET(x8664_pda_pcurrent));
if (CRASHDEBUG(2))
fprintf(fp,
"CPU%d: level4_pgt: %lx "
"data_offset: %lx pcurrent: %lx\n",
i, level4_pgt, data_offset,
DUMPFILE() ? machdep->machspec->current[i] : 0);
}
if (!LKCD_KERNTYPES() &&
(i = get_array_length("boot_cpu_stack", NULL, 0))) {
istacksize = i;
} else if ((sp = symbol_search("boot_cpu_stack")) &&
(nsp = next_symbol(NULL, sp))) {
istacksize = (nsp->value - sp->value) & ~(PAGESIZE()-1);
if (istacksize != 16384)
error(WARNING,
"calculated irqstack size of %ld != 16K?\n\n",
istacksize);
} else
istacksize = 16384;
machdep->machspec->stkinfo.isize = istacksize;
/*
* Adjust the kernel top-of-stack values down to their base.
*/
for (i = 0; i < NR_CPUS; i++) {
if (machdep->machspec->stkinfo.ibase[i])
machdep->machspec->stkinfo.ibase[i] -= (istacksize-64);
else
break;
}
/*
* Sanity check cpu 0's IRQ stack, which should be located at
* the address of &boot_cpu_stack[0].
*/
sp = value_search(machdep->machspec->stkinfo.ibase[0], &offset);
nsp = symbol_search("boot_cpu_stack");
if (!sp || offset || !nsp || (sp->value != nsp->value)) {
if (symbol_exists("boot_cpu_stack")) {
error(WARNING,
"cpu 0 IRQ stack: %lx\n boot_cpu_stack: %lx\n\n",
machdep->machspec->stkinfo.ibase[0],
symbol_value("boot_cpu_stack"));
if (!machdep->machspec->stkinfo.ibase[0])
machdep->machspec->stkinfo.ibase[0] =
symbol_value("boot_cpu_stack");
} else
error(WARNING,
"boot_cpu_stack: symbol does not exist in this kernel!\n");
}
kt->cpus = cpus;
if (kt->cpus > 1)
kt->flags |= SMP;
verify_spinlock();
FREEBUF(cpu_pda_buf);
}
static void
x86_64_per_cpu_init(void)
{
int i, cpus, cpunumber;
struct machine_specific *ms;
struct syment *irq_sp, *curr_sp, *cpu_sp;
ms = machdep->machspec;
irq_sp = per_cpu_symbol_search("per_cpu__irq_stack_union");
cpu_sp = per_cpu_symbol_search("per_cpu__cpu_number");
curr_sp = per_cpu_symbol_search("per_cpu__current_task");
if (!(kt->flags & PER_CPU_OFF)) {
/*
* Presume kernel is !CONFIG_SMP.
*/
if (irq_sp || (irq_sp = symbol_search("irq_stack_union"))) {
ms->stkinfo.ibase[0] = irq_sp->value;
if ((ms->stkinfo.isize =
MEMBER_SIZE("irq_stack_union", "irq_stack")) <= 0)
ms->stkinfo.isize = 16384;
}
if (DUMPFILE() && curr_sp) {
if (!(ms->current = calloc(kt->cpus, sizeof(ulong))))
error(FATAL,
"cannot calloc"
" %d x86_64 current pointers!\n",
kt->cpus);
get_symbol_data(curr_sp->name, sizeof(ulong),
&ms->current[0]);
}
return;
}
if (!cpu_sp || !irq_sp)
return;
for (i = cpus = 0; i < NR_CPUS; i++) {
if (!readmem(cpu_sp->value + kt->__per_cpu_offset[i],
KVADDR, &cpunumber, sizeof(int),
"cpu number (per_cpu)", QUIET|RETURN_ON_ERROR))
break;
if (cpunumber != cpus)
break;
cpus++;
ms->stkinfo.ibase[i] = irq_sp->value + kt->__per_cpu_offset[i];
}
if ((ms->stkinfo.isize =
MEMBER_SIZE("irq_stack_union", "irq_stack")) <= 0)
ms->stkinfo.isize = 16384;
if (CRASHDEBUG(2))
fprintf(fp, "x86_64_per_cpu_init: "
"setup_percpu areas: %d\n", cpus);
if (cpus > 1)
kt->flags |= SMP;
if ((i = get_cpus_present()) && (!cpus || (i < cpus)))
kt->cpus = get_highest_cpu_present() + 1;
else
kt->cpus = cpus;
if (DUMPFILE() && curr_sp) {
if ((ms->current = calloc(kt->cpus, sizeof(ulong))) == NULL)
error(FATAL,
"cannot calloc %d x86_64 current pointers!\n",
kt->cpus);
for (i = 0; i < kt->cpus; i++)
if (!readmem(curr_sp->value + kt->__per_cpu_offset[i],
KVADDR, &ms->current[i], sizeof(ulong),
"current_task (per_cpu)", RETURN_ON_ERROR))
continue;
}
verify_spinlock();
}
/*
* Gather the ist addresses for each CPU.
*/
static void
x86_64_ist_init(void)
{
int c, i, cnt, cpus, esize;
ulong vaddr, offset;
ulong init_tss;
struct machine_specific *ms;
struct syment *boot_sp, *tss_sp, *ist_sp;
ms = machdep->machspec;
tss_sp = per_cpu_symbol_search("per_cpu__init_tss");
ist_sp = per_cpu_symbol_search("per_cpu__orig_ist");
x86_64_exception_stacks_init();
if (!tss_sp && symbol_exists("init_tss")) {
init_tss = symbol_value("init_tss");
for (c = cpus = 0; c < NR_CPUS; c++) {
vaddr = init_tss + (c * SIZE(tss_struct)) +
OFFSET(tss_struct_ist);
readmem(vaddr, KVADDR, &ms->stkinfo.ebase[c][0],
sizeof(ulong) * MAX_EXCEPTION_STACKS,
"tss_struct ist array", FAULT_ON_ERROR);
if (ms->stkinfo.ebase[c][0] == 0)
break;
}
} else if (tss_sp) {
for (c = 0; c < kt->cpus; c++) {
if ((kt->flags & SMP) && (kt->flags & PER_CPU_OFF)) {
if (kt->__per_cpu_offset[c] == 0)
break;
vaddr = tss_sp->value + kt->__per_cpu_offset[c];
} else
vaddr = tss_sp->value;
vaddr += OFFSET(tss_struct_ist);
readmem(vaddr, KVADDR, &ms->stkinfo.ebase[c][0],
sizeof(ulong) * MAX_EXCEPTION_STACKS,
"tss_struct ist array", FAULT_ON_ERROR);
if (ms->stkinfo.ebase[c][0] == 0)
break;
}
if (ist_sp) {
for (c = 0; c < kt->cpus; c++) {
ulong estacks[MAX_EXCEPTION_STACKS];
if ((kt->flags & SMP) && (kt->flags & PER_CPU_OFF)) {
if (kt->__per_cpu_offset[c] == 0)
break;
vaddr = ist_sp->value + kt->__per_cpu_offset[c];
} else
vaddr = ist_sp->value;
readmem(vaddr, KVADDR, &estacks[0],
sizeof(ulong) * MAX_EXCEPTION_STACKS,
"orig_ist array", FAULT_ON_ERROR);
for (i = 0; i < MAX_EXCEPTION_STACKS; i++) {
if (ms->stkinfo.ebase[c][i] != estacks[i])
error(WARNING,
"cpu %d %s stack: init_tss: %lx orig_ist: %lx\n", c,
ms->stkinfo.exception_stacks[i],
ms->stkinfo.ebase[c][i], estacks[i]);
ms->stkinfo.ebase[c][i] = estacks[i];
}
}
}
} else if (!symbol_exists("boot_exception_stacks")) {
machdep->flags |= NO_TSS;
if (CRASHDEBUG(1))
error(NOTE, "CONFIG_X86_NO_TSS\n");
return;
}
if (ms->stkinfo.ebase[0][0] && ms->stkinfo.ebase[0][1])
esize = ms->stkinfo.ebase[0][1] - ms->stkinfo.ebase[0][0];
else
esize = 4096;
/*
* Knowing the size, now adjust the top-of-stack addresses back down
* to the base stack address.
*/
for (c = 0; c < kt->cpus; c++) {
for (i = cnt = 0; i < MAX_EXCEPTION_STACKS; i++) {
if (ms->stkinfo.ebase[c][i] == 0)
break;
cnt++;
if ((THIS_KERNEL_VERSION >= LINUX(2,6,18)) &&
STREQ(ms->stkinfo.exception_stacks[i], "DEBUG"))
ms->stkinfo.esize[i] = esize*2;
else
ms->stkinfo.esize[i] = esize;
ms->stkinfo.ebase[c][i] -= ms->stkinfo.esize[i];
}
}
/*
* Sanity check cpu 0's first exception stack, which should be
* located at: &boot_exception_stacks[0]
*/
boot_sp = value_search(ms->stkinfo.ebase[0][0], &offset);
if (!boot_sp || offset ||
!STREQ(boot_sp->name, "boot_exception_stacks")) {
if ((boot_sp = symbol_search("boot_exception_stacks"))) {
error(WARNING,
"cpu 0 first exception stack: %lx\n boot_exception_stacks: %lx\n\n",
ms->stkinfo.ebase[0][0], boot_sp->value);
if (!ms->stkinfo.ebase[0][0])
ms->stkinfo.ebase[0][0] = boot_sp->value;
} else if (STRUCT_EXISTS("x8664_pda"))
error(WARNING,
"boot_exception_stacks: symbol does not exist in this kernel!\n");
}
}
static void
x86_64_post_init(void)
{
int c, i, clues;
struct machine_specific *ms;
ulong *up;
struct syment *spt, *spc;
ulong offset;
/*
* Check whether each cpu was stopped by an NMI.
*/
ms = machdep->machspec;
if (DUMPFILE() &&
(ms->crash_nmi_rsp = calloc(kt->cpus, sizeof(ulong))) == NULL)
error(FATAL, "cannot calloc %d x86_64 NMI rsp values\n",
kt->cpus);
for (c = 0; DUMPFILE() && (c < kt->cpus); c++) {
if (ms->stkinfo.ebase[c][NMI_STACK] == 0)
break;
if (!readmem(ms->stkinfo.ebase[c][NMI_STACK],
KVADDR, ms->irqstack,
ms->stkinfo.esize[NMI_STACK],
"NMI exception stack contents",
RETURN_ON_ERROR|QUIET))
continue;
for (i = clues = 0; i < (ms->stkinfo.esize[NMI_STACK])/sizeof(ulong); i++){
up = (ulong *)(&ms->irqstack[i*sizeof(ulong)]);
if (!is_kernel_text(*up) ||
!(spt = value_search(*up, &offset)))
continue;
if (STREQ(spt->name, "try_crashdump") ||
STREQ(spt->name, "die_nmi"))
clues++;
if ((STREQ(spt->name, "nmi_watchdog_tick") ||
STREQ(spt->name, "default_do_nmi"))) {
spc = x86_64_function_called_by((*up)-5);
if (spc && STREQ(spc->name, "die_nmi"))
clues += 2;
}
if (STREQ(spt->name, "crash_nmi_callback")) {
up = (ulong *)(&ms->irqstack[ms->stkinfo.esize[NMI_STACK]]);
up -= 2;
ms->crash_nmi_rsp[c] = *up;
}
}
if (clues >= 2)
kt->cpu_flags[c] |= NMI;
}
if (symbol_exists("__sched_text_start") &&
(symbol_value("__sched_text_start") == symbol_value("schedule")))
machdep->flags |= SCHED_TEXT;
}
/*
* No x86_64 swapper_pg_dir; initialize the vt->kernel_pgd[NR_CPUS] array
* with the lazily-sync'd init_level4_pgt page address. The level4 page
* could be taken from the per-cpu cpu_pda.level4_pgt pointer, but since
* the kernel pgd_offset_k() is defined as shown below, we'll derive
* the third-level pgd in the same manner:
*
* /@ This accesses the reference page table of the boot cpu.
* Other CPUs get synced lazily via the page fault handler. @/
*
* static inline pgd_t *pgd_offset_k(unsigned long address)
* {
* unsigned long addr;
*
* addr = pml4_val(init_level4_pgt[pml4_index(address)]);
* addr &= PHYSICAL_PAGE_MASK;
* return __pgd_offset_k((pgd_t *)__va(addr), address);
* }
*/
static void
x86_64_init_kernel_pgd(void)
{
int i;
ulong init_level4_pgt;
init_level4_pgt = symbol_value("init_level4_pgt");
for (i = 0; i < NR_CPUS; i++)
vt->kernel_pgd[i] = init_level4_pgt;
FILL_PML4();
}
/*
* x86_64 __pa() clone.
*/
ulong x86_64_VTOP(ulong vaddr)
{
if (vaddr >= __START_KERNEL_map)
return ((vaddr) - (ulong)__START_KERNEL_map + machdep->machspec->phys_base);
else
return ((vaddr) - PAGE_OFFSET);
}
/*
* Include both vmalloc'd and module address space as VMALLOC space.
*/
int
x86_64_IS_VMALLOC_ADDR(ulong vaddr)
{
return ((vaddr >= VMALLOC_START && vaddr <= VMALLOC_END) ||
((machdep->flags & VMEMMAP) &&
(vaddr >= VMEMMAP_VADDR && vaddr <= VMEMMAP_END)) ||
(vaddr >= MODULES_VADDR && vaddr <= MODULES_END));
}
static int
x86_64_is_module_addr(ulong vaddr)
{
return (vaddr >= MODULES_VADDR && vaddr <= MODULES_END);
}
/*
* Refining this may cause more problems than just doing it this way.
*/
static int
x86_64_is_kvaddr(ulong addr)
{
if (machdep->flags & VM_XEN_RHEL4)
return (addr >= VMALLOC_START);
else
return (addr >= PAGE_OFFSET);
}
static int
x86_64_is_uvaddr(ulong addr, struct task_context *tc)
{
return (addr < USERSPACE_TOP);
}
/*
* Translates a user virtual address to its physical address. cmd_vtop()
* sets the verbose flag so that the pte translation gets displayed; all
* other callers quietly accept the translation.
*
* This routine can also take mapped kernel virtual addresses if the -u flag
* was passed to cmd_vtop(), just pass it to x86_64_kvtop().
*/
static int
x86_64_uvtop_level4(struct task_context *tc, ulong uvaddr, physaddr_t *paddr, int verbose)
{
ulong mm;
ulong *pml;
ulong pml_paddr;
ulong pml_pte;
ulong *pgd;
ulong pgd_paddr;
ulong pgd_pte;
ulong *pmd;
ulong pmd_paddr;
ulong pmd_pte;
ulong *ptep;
ulong pte_paddr;
ulong pte;
physaddr_t physpage;
if (!tc)
error(FATAL, "current context invalid\n");
*paddr = 0;
if (IS_KVADDR(uvaddr))
return x86_64_kvtop(tc, uvaddr, paddr, verbose);
if ((mm = task_mm(tc->task, TRUE)))
pml = ULONG_PTR(tt->mm_struct + OFFSET(mm_struct_pgd));
else
readmem(tc->mm_struct + OFFSET(mm_struct_pgd), KVADDR, &pml,
sizeof(long), "mm_struct pgd", FAULT_ON_ERROR);
pml_paddr = x86_64_VTOP((ulong)pml);
FILL_UPML(pml_paddr, PHYSADDR, PAGESIZE());
pml = ((ulong *)pml_paddr) + pml4_index(uvaddr);
pml_pte = ULONG(machdep->machspec->upml + PAGEOFFSET(pml));
if (verbose)
fprintf(fp, " PML: %lx => %lx\n", (ulong)pml, pml_pte);
if (!(pml_pte & _PAGE_PRESENT))
goto no_upage;
pgd_paddr = pml_pte & PHYSICAL_PAGE_MASK;
FILL_PGD(pgd_paddr, PHYSADDR, PAGESIZE());
pgd = ((ulong *)pgd_paddr) + pgd_index(uvaddr);
pgd_pte = ULONG(machdep->pgd + PAGEOFFSET(pgd));
if (verbose)
fprintf(fp, " PUD: %lx => %lx\n", (ulong)pgd, pgd_pte);
if (!(pgd_pte & _PAGE_PRESENT))
goto no_upage;
/*
* pmd = pmd_offset(pgd, address);
*/
pmd_paddr = pgd_pte & PHYSICAL_PAGE_MASK;
FILL_PMD(pmd_paddr, PHYSADDR, PAGESIZE());
pmd = ((ulong *)pmd_paddr) + pmd_index(uvaddr);
pmd_pte = ULONG(machdep->pmd + PAGEOFFSET(pmd));
if (verbose)
fprintf(fp, " PMD: %lx => %lx\n", (ulong)pmd, pmd_pte);
if (!(pmd_pte & (_PAGE_PRESENT | _PAGE_PROTNONE)))
goto no_upage;
if (pmd_pte & _PAGE_PSE) {
if (verbose) {
fprintf(fp, " PAGE: %lx (2MB)\n\n",
PAGEBASE(pmd_pte) & PHYSICAL_PAGE_MASK);
x86_64_translate_pte(pmd_pte, 0, 0);
}
physpage = (PAGEBASE(pmd_pte) & PHYSICAL_PAGE_MASK) +
(uvaddr & ~_2MB_PAGE_MASK);
*paddr = physpage;
return TRUE;
}
/*
* ptep = pte_offset_map(pmd, address);
* pte = *ptep;
*/
pte_paddr = pmd_pte & PHYSICAL_PAGE_MASK;
FILL_PTBL(pte_paddr, PHYSADDR, PAGESIZE());
ptep = ((ulong *)pte_paddr) + pte_index(uvaddr);
pte = ULONG(machdep->ptbl + PAGEOFFSET(ptep));
if (verbose)
fprintf(fp, " PTE: %lx => %lx\n", (ulong)ptep, pte);
if (!(pte & (_PAGE_PRESENT))) {
*paddr = pte;
if (pte && verbose) {
fprintf(fp, "\n");
x86_64_translate_pte(pte, 0, 0);
}
goto no_upage;
}
*paddr = (PAGEBASE(pte) & PHYSICAL_PAGE_MASK) + PAGEOFFSET(uvaddr);
if (verbose) {
fprintf(fp, " PAGE: %lx\n\n",
PAGEBASE(*paddr) & PHYSICAL_PAGE_MASK);
x86_64_translate_pte(pte, 0, 0);
}
return TRUE;
no_upage:
return FALSE;
}
static int
x86_64_uvtop_level4_xen_wpt(struct task_context *tc, ulong uvaddr, physaddr_t *paddr, int verbose)
{
ulong mm;
ulong *pml;
ulong pml_paddr;
ulong pml_pte;
ulong *pgd;
ulong pgd_paddr;
ulong pgd_pte;
ulong *pmd;
ulong pmd_paddr;
ulong pmd_pte;
ulong pseudo_pmd_pte;
ulong *ptep;
ulong pte_paddr;
ulong pte;
ulong pseudo_pte;
physaddr_t physpage;
char buf[BUFSIZE];
if (!tc)
error(FATAL, "current context invalid\n");
*paddr = 0;
if (IS_KVADDR(uvaddr))
return x86_64_kvtop(tc, uvaddr, paddr, verbose);
if ((mm = task_mm(tc->task, TRUE)))
pml = ULONG_PTR(tt->mm_struct + OFFSET(mm_struct_pgd));
else
readmem(tc->mm_struct + OFFSET(mm_struct_pgd), KVADDR, &pml,
sizeof(long), "mm_struct pgd", FAULT_ON_ERROR);
pml_paddr = x86_64_VTOP((ulong)pml);
FILL_UPML(pml_paddr, PHYSADDR, PAGESIZE());
pml = ((ulong *)pml_paddr) + pml4_index(uvaddr);
pml_pte = ULONG(machdep->machspec->upml + PAGEOFFSET(pml));
if (verbose)
fprintf(fp, " PML: %lx => %lx [machine]\n", (ulong)pml, pml_pte);
if (!(pml_pte & _PAGE_PRESENT))
goto no_upage;
pgd_paddr = pml_pte & PHYSICAL_PAGE_MASK;
pgd_paddr = xen_m2p(pgd_paddr);
if (verbose)
fprintf(fp, " PML: %lx\n", pgd_paddr);
FILL_PGD(pgd_paddr, PHYSADDR, PAGESIZE());
pgd = ((ulong *)pgd_paddr) + pgd_index(uvaddr);
pgd_pte = ULONG(machdep->pgd + PAGEOFFSET(pgd));
if (verbose)
fprintf(fp, " PUD: %lx => %lx [machine]\n", (ulong)pgd, pgd_pte);
if (!(pgd_pte & _PAGE_PRESENT))
goto no_upage;
/*
* pmd = pmd_offset(pgd, address);
*/
pmd_paddr = pgd_pte & PHYSICAL_PAGE_MASK;
pmd_paddr = xen_m2p(pmd_paddr);
if (verbose)
fprintf(fp, " PUD: %lx\n", pmd_paddr);
FILL_PMD(pmd_paddr, PHYSADDR, PAGESIZE());
pmd = ((ulong *)pmd_paddr) + pmd_index(uvaddr);
pmd_pte = ULONG(machdep->pmd + PAGEOFFSET(pmd));
if (verbose)
fprintf(fp, " PMD: %lx => %lx [machine]\n", (ulong)pmd, pmd_pte);
if (!(pmd_pte & _PAGE_PRESENT))
goto no_upage;
if (pmd_pte & _PAGE_PSE) {
if (verbose)
fprintf(fp, " PAGE: %lx (2MB) [machine]\n",
PAGEBASE(pmd_pte) & PHYSICAL_PAGE_MASK);
pseudo_pmd_pte = xen_m2p(PAGEBASE(pmd_pte));
if (pseudo_pmd_pte == XEN_MACHADDR_NOT_FOUND) {
if (verbose)
fprintf(fp, " PAGE: page not available\n");
*paddr = PADDR_NOT_AVAILABLE;
return FALSE;
}
pseudo_pmd_pte |= PAGEOFFSET(pmd_pte);
if (verbose) {
fprintf(fp, " PAGE: %s (2MB)\n\n",
mkstring(buf, VADDR_PRLEN, RJUST|LONG_HEX,
MKSTR(PAGEBASE(pseudo_pmd_pte) &
PHYSICAL_PAGE_MASK)));
x86_64_translate_pte(pseudo_pmd_pte, 0, 0);
}
physpage = (PAGEBASE(pseudo_pmd_pte) & PHYSICAL_PAGE_MASK) +
(uvaddr & ~_2MB_PAGE_MASK);
*paddr = physpage;
return TRUE;
}
/*
* ptep = pte_offset_map(pmd, address);
* pte = *ptep;
*/
pte_paddr = pmd_pte & PHYSICAL_PAGE_MASK;
pte_paddr = xen_m2p(pte_paddr);
if (verbose)
fprintf(fp, " PMD: %lx\n", pte_paddr);
FILL_PTBL(pte_paddr, PHYSADDR, PAGESIZE());
ptep = ((ulong *)pte_paddr) + pte_index(uvaddr);
pte = ULONG(machdep->ptbl + PAGEOFFSET(ptep));
if (verbose)
fprintf(fp, " PTE: %lx => %lx [machine]\n", (ulong)ptep, pte);
if (!(pte & (_PAGE_PRESENT))) {
*paddr = pte;
if (pte && verbose) {
fprintf(fp, "\n");
x86_64_translate_pte(pte, 0, 0);
}
goto no_upage;
}
pseudo_pte = xen_m2p(pte & PHYSICAL_PAGE_MASK);
if (verbose)
fprintf(fp, " PTE: %lx\n", pseudo_pte + PAGEOFFSET(pte));
*paddr = (PAGEBASE(pseudo_pte) & PHYSICAL_PAGE_MASK) + PAGEOFFSET(uvaddr);
if (verbose) {
fprintf(fp, " PAGE: %lx [machine]\n",
PAGEBASE(pte) & PHYSICAL_PAGE_MASK);
fprintf(fp, " PAGE: %lx\n\n",
PAGEBASE(*paddr) & PHYSICAL_PAGE_MASK);
x86_64_translate_pte(pseudo_pte + PAGEOFFSET(pte), 0, 0);
}
return TRUE;
no_upage:
return FALSE;
}
static int
x86_64_uvtop_level4_rhel4_xen_wpt(struct task_context *tc, ulong uvaddr, physaddr_t *paddr, int verbose)
{
ulong mm;
ulong *pgd;
ulong pgd_paddr;
ulong pgd_pte;
ulong *pmd;
ulong pmd_paddr;
ulong pmd_pte;
ulong pseudo_pmd_pte;
ulong *ptep;
ulong pte_paddr;
ulong pte;
ulong pseudo_pte;
physaddr_t physpage;
char buf[BUFSIZE];
if (!tc)
error(FATAL, "current context invalid\n");
*paddr = 0;
if (IS_KVADDR(uvaddr))
return x86_64_kvtop(tc, uvaddr, paddr, verbose);
if ((mm = task_mm(tc->task, TRUE)))
pgd = ULONG_PTR(tt->mm_struct + OFFSET(mm_struct_pgd));
else
readmem(tc->mm_struct + OFFSET(mm_struct_pgd), KVADDR, &pgd,
sizeof(long), "mm_struct pgd", FAULT_ON_ERROR);
pgd_paddr = x86_64_VTOP((ulong)pgd);
FILL_PGD(pgd_paddr, PHYSADDR, PAGESIZE());
pgd = ((ulong *)pgd_paddr) + pgd_index(uvaddr);
pgd_pte = ULONG(machdep->pgd + PAGEOFFSET(pgd));
if (verbose)
fprintf(fp, " PGD: %lx => %lx [machine]\n", (ulong)pgd, pgd_pte);
if (!(pgd_pte & _PAGE_PRESENT))
goto no_upage;
/*
* pmd = pmd_offset(pgd, address);
*/
pmd_paddr = pgd_pte & PHYSICAL_PAGE_MASK;
pmd_paddr = xen_m2p(pmd_paddr);
if (verbose)
fprintf(fp, " PGD: %lx\n", pmd_paddr);
FILL_PMD(pmd_paddr, PHYSADDR, PAGESIZE());
pmd = ((ulong *)pmd_paddr) + pmd_index(uvaddr);
pmd_pte = ULONG(machdep->pmd + PAGEOFFSET(pmd));
if (verbose)
fprintf(fp, " PMD: %lx => %lx [machine]\n", (ulong)pmd, pmd_pte);
if (!(pmd_pte & _PAGE_PRESENT))
goto no_upage;
if (pmd_pte & _PAGE_PSE) {
if (verbose)
fprintf(fp, " PAGE: %lx (2MB) [machine]\n",
PAGEBASE(pmd_pte) & PHYSICAL_PAGE_MASK);
pseudo_pmd_pte = xen_m2p(PAGEBASE(pmd_pte));
if (pseudo_pmd_pte == XEN_MACHADDR_NOT_FOUND) {
if (verbose)
fprintf(fp, " PAGE: page not available\n");
*paddr = PADDR_NOT_AVAILABLE;
return FALSE;
}
pseudo_pmd_pte |= PAGEOFFSET(pmd_pte);
if (verbose) {
fprintf(fp, " PAGE: %s (2MB)\n\n",
mkstring(buf, VADDR_PRLEN, RJUST|LONG_HEX,
MKSTR(PAGEBASE(pseudo_pmd_pte) &
PHYSICAL_PAGE_MASK)));
x86_64_translate_pte(pseudo_pmd_pte, 0, 0);
}
physpage = (PAGEBASE(pseudo_pmd_pte) & PHYSICAL_PAGE_MASK) +
(uvaddr & ~_2MB_PAGE_MASK);
*paddr = physpage;
return TRUE;
}
/*
* ptep = pte_offset_map(pmd, address);
* pte = *ptep;
*/
pte_paddr = pmd_pte & PHYSICAL_PAGE_MASK;
pte_paddr = xen_m2p(pte_paddr);
if (verbose)
fprintf(fp, " PMD: %lx\n", pte_paddr);
FILL_PTBL(pte_paddr, PHYSADDR, PAGESIZE());
ptep = ((ulong *)pte_paddr) + pte_index(uvaddr);
pte = ULONG(machdep->ptbl + PAGEOFFSET(ptep));
if (verbose)
fprintf(fp, " PTE: %lx => %lx [machine]\n", (ulong)ptep, pte);
if (!(pte & (_PAGE_PRESENT))) {
*paddr = pte;
if (pte && verbose) {
fprintf(fp, "\n");
x86_64_translate_pte(pte, 0, 0);
}
goto no_upage;
}
pseudo_pte = xen_m2p(pte & PHYSICAL_PAGE_MASK);
if (verbose)
fprintf(fp, " PTE: %lx\n", pseudo_pte + PAGEOFFSET(pte));
*paddr = (PAGEBASE(pseudo_pte) & PHYSICAL_PAGE_MASK) + PAGEOFFSET(uvaddr);
if (verbose) {
fprintf(fp, " PAGE: %lx [machine]\n",
PAGEBASE(pte) & PHYSICAL_PAGE_MASK);
fprintf(fp, " PAGE: %lx\n\n",
PAGEBASE(*paddr) & PHYSICAL_PAGE_MASK);
x86_64_translate_pte(pseudo_pte + PAGEOFFSET(pte), 0, 0);
}
return TRUE;
no_upage:
return FALSE;
}
static int
x86_64_uvtop(struct task_context *tc, ulong uvaddr, physaddr_t *paddr, int verbose)
{
ulong mm;
ulong *pgd;
ulong pgd_paddr;
ulong pgd_pte;
ulong *pmd;
ulong pmd_paddr;
ulong pmd_pte;
ulong *ptep;
ulong pte_paddr;
ulong pte;
physaddr_t physpage;
if (!tc)
error(FATAL, "current context invalid\n");
*paddr = 0;
if (IS_KVADDR(uvaddr))
return x86_64_kvtop(tc, uvaddr, paddr, verbose);
/*
* pgd = pgd_offset(mm, address);
*/
if ((mm = task_mm(tc->task, TRUE)))
pgd = ULONG_PTR(tt->mm_struct + OFFSET(mm_struct_pgd));
else
readmem(tc->mm_struct + OFFSET(mm_struct_pgd), KVADDR, &pgd,
sizeof(long), "mm_struct pgd", FAULT_ON_ERROR);
pgd_paddr = x86_64_VTOP((ulong)pgd);
FILL_PGD(pgd_paddr, PHYSADDR, PAGESIZE());
pgd = ((ulong *)pgd_paddr) + pgd_index(uvaddr);
pgd_pte = ULONG(machdep->pgd + PAGEOFFSET(pgd));
if (verbose)
fprintf(fp, " PGD: %lx => %lx\n", (ulong)pgd, pgd_pte);
if (!(pgd_pte & _PAGE_PRESENT))
goto no_upage;
/*
* pmd = pmd_offset(pgd, address);
*/
pmd_paddr = pgd_pte & PHYSICAL_PAGE_MASK;
FILL_PMD(pmd_paddr, PHYSADDR, PAGESIZE());
pmd = ((ulong *)pmd_paddr) + pmd_index(uvaddr);
pmd_pte = ULONG(machdep->pmd + PAGEOFFSET(pmd));
if (verbose)
fprintf(fp, " PMD: %lx => %lx\n", (ulong)pmd, pmd_pte);
if (!(pmd_pte & _PAGE_PRESENT))
goto no_upage;
if (pmd_pte & _PAGE_PSE) {
if (verbose) {
fprintf(fp, " PAGE: %lx (2MB)\n\n",
PAGEBASE(pmd_pte) & PHYSICAL_PAGE_MASK);
x86_64_translate_pte(pmd_pte, 0, 0);
}
physpage = (PAGEBASE(pmd_pte) & PHYSICAL_PAGE_MASK) +
(uvaddr & ~_2MB_PAGE_MASK);
*paddr = physpage;
return TRUE;
}
/*
* ptep = pte_offset_map(pmd, address);
* pte = *ptep;
*/
pte_paddr = pmd_pte & PHYSICAL_PAGE_MASK;
FILL_PTBL(pte_paddr, PHYSADDR, PAGESIZE());
ptep = ((ulong *)pte_paddr) + pte_index(uvaddr);
pte = ULONG(machdep->ptbl + PAGEOFFSET(ptep));
if (verbose)
fprintf(fp, " PTE: %lx => %lx\n", (ulong)ptep, pte);
if (!(pte & (_PAGE_PRESENT))) {
*paddr = pte;
if (pte && verbose) {
fprintf(fp, "\n");
x86_64_translate_pte(pte, 0, 0);
}
goto no_upage;
}
*paddr = (PAGEBASE(pte) & PHYSICAL_PAGE_MASK) + PAGEOFFSET(uvaddr);
if (verbose) {
fprintf(fp, " PAGE: %lx\n\n",
PAGEBASE(*paddr) & PHYSICAL_PAGE_MASK);
x86_64_translate_pte(pte, 0, 0);
}
return TRUE;
no_upage:
return FALSE;
}
/*
* Translates a kernel virtual address to its physical address. cmd_vtop()
* sets the verbose flag so that the pte translation gets displayed; all
* other callers quietly accept the translation.
*/
static int
x86_64_kvtop(struct task_context *tc, ulong kvaddr, physaddr_t *paddr, int verbose)
{
ulong *pml4;
ulong *pgd;
ulong pgd_paddr;
ulong pgd_pte;
ulong *pmd;
ulong pmd_paddr;
ulong pmd_pte;
ulong *ptep;
ulong pte_paddr;
ulong pte;
physaddr_t physpage;
if (!IS_KVADDR(kvaddr))
return FALSE;
if (XEN_HYPER_MODE()) {
if (XEN_VIRT_ADDR(kvaddr)) {
*paddr = kvaddr - XEN_VIRT_START + xen_phys_start();
return TRUE;
}
if (DIRECTMAP_VIRT_ADDR(kvaddr)) {
*paddr = kvaddr - DIRECTMAP_VIRT_START;
return TRUE;
}
FILL_PML4_HYPER();
pml4 = ((ulong *)machdep->machspec->pml4) + pml4_index(kvaddr);
if (verbose) {
fprintf(fp, "PML4 DIRECTORY: %lx\n", vt->kernel_pgd[0]);
fprintf(fp, "PAGE DIRECTORY: %lx\n", *pml4);
}
} else {
if (!vt->vmalloc_start) {
*paddr = x86_64_VTOP(kvaddr);
return TRUE;
}
if (!IS_VMALLOC_ADDR(kvaddr)) {
*paddr = x86_64_VTOP(kvaddr);
if (!verbose)
return TRUE;
}
if (XEN() && (kt->xen_flags & WRITABLE_PAGE_TABLES))
return (x86_64_kvtop_xen_wpt(tc, kvaddr, paddr, verbose));
/*
* pgd = pgd_offset_k(addr);
*/
FILL_PML4();
pml4 = ((ulong *)machdep->machspec->pml4) + pml4_index(kvaddr);
if (verbose) {
fprintf(fp, "PML4 DIRECTORY: %lx\n", vt->kernel_pgd[0]);
fprintf(fp, "PAGE DIRECTORY: %lx\n", *pml4);
}
}
if (!(*pml4) & _PAGE_PRESENT)
goto no_kpage;
pgd_paddr = (*pml4) & PHYSICAL_PAGE_MASK;
FILL_PGD(pgd_paddr, PHYSADDR, PAGESIZE());
pgd = ((ulong *)pgd_paddr) + pgd_index(kvaddr);
pgd_pte = ULONG(machdep->pgd + PAGEOFFSET(pgd));
if (verbose)
fprintf(fp, " PUD: %lx => %lx\n", (ulong)pgd, pgd_pte);
if (!(pgd_pte & _PAGE_PRESENT))
goto no_kpage;
/*
* pmd = pmd_offset(pgd, addr);
*/
pmd_paddr = pgd_pte & PHYSICAL_PAGE_MASK;
FILL_PMD(pmd_paddr, PHYSADDR, PAGESIZE());
pmd = ((ulong *)pmd_paddr) + pmd_index(kvaddr);
pmd_pte = ULONG(machdep->pmd + PAGEOFFSET(pmd));
if (verbose)
fprintf(fp, " PMD: %lx => %lx\n", (ulong)pmd, pmd_pte);
if (!(pmd_pte & _PAGE_PRESENT))
goto no_kpage;
if (pmd_pte & _PAGE_PSE) {
if (verbose) {
fprintf(fp, " PAGE: %lx (2MB)\n\n",
PAGEBASE(pmd_pte) & PHYSICAL_PAGE_MASK);
x86_64_translate_pte(pmd_pte, 0, 0);
}
physpage = (PAGEBASE(pmd_pte) & PHYSICAL_PAGE_MASK) +
(kvaddr & ~_2MB_PAGE_MASK);
*paddr = physpage;
return TRUE;
}
/*
* ptep = pte_offset_map(pmd, addr);
* pte = *ptep;
*/
pte_paddr = pmd_pte & PHYSICAL_PAGE_MASK;
FILL_PTBL(pte_paddr, PHYSADDR, PAGESIZE());
ptep = ((ulong *)pte_paddr) + pte_index(kvaddr);
pte = ULONG(machdep->ptbl + PAGEOFFSET(ptep));
if (verbose)
fprintf(fp, " PTE: %lx => %lx\n", (ulong)ptep, pte);
if (!(pte & (_PAGE_PRESENT))) {
if (pte && verbose) {
fprintf(fp, "\n");
x86_64_translate_pte(pte, 0, 0);
}
goto no_kpage;
}
*paddr = (PAGEBASE(pte) & PHYSICAL_PAGE_MASK) + PAGEOFFSET(kvaddr);
if (verbose) {
fprintf(fp, " PAGE: %lx\n\n",
PAGEBASE(*paddr) & PHYSICAL_PAGE_MASK);
x86_64_translate_pte(pte, 0, 0);
}
return TRUE;
no_kpage:
return FALSE;
}
static int
x86_64_kvtop_xen_wpt(struct task_context *tc, ulong kvaddr, physaddr_t *paddr, int verbose)
{
ulong *pml4;
ulong *pgd;
ulong pgd_paddr;
ulong pgd_pte;
ulong *pmd;
ulong pmd_paddr;
ulong pmd_pte;
ulong pseudo_pmd_pte;
ulong *ptep;
ulong pte_paddr;
ulong pte;
ulong pseudo_pte;
physaddr_t physpage;
char buf[BUFSIZE];
/*
* pgd = pgd_offset_k(addr);
*/
FILL_PML4();
pml4 = ((ulong *)machdep->machspec->pml4) + pml4_index(kvaddr);
if (verbose) {
fprintf(fp, "PML4 DIRECTORY: %lx\n", vt->kernel_pgd[0]);
fprintf(fp, "PAGE DIRECTORY: %lx [machine]\n", *pml4);
}
if (!(*pml4) & _PAGE_PRESENT)
goto no_kpage;
pgd_paddr = (*pml4) & PHYSICAL_PAGE_MASK;
pgd_paddr = xen_m2p(pgd_paddr);
if (verbose)
fprintf(fp, "PAGE DIRECTORY: %lx\n", pgd_paddr);
FILL_PGD(pgd_paddr, PHYSADDR, PAGESIZE());
pgd = ((ulong *)pgd_paddr) + pgd_index(kvaddr);
pgd_pte = ULONG(machdep->pgd + PAGEOFFSET(pgd));
if (verbose)
fprintf(fp, " PUD: %lx => %lx [machine]\n", (ulong)pgd, pgd_pte);
if (!(pgd_pte & _PAGE_PRESENT))
goto no_kpage;
/*
* pmd = pmd_offset(pgd, addr);
*/
pmd_paddr = pgd_pte & PHYSICAL_PAGE_MASK;
pmd_paddr = xen_m2p(pmd_paddr);
if (verbose)
fprintf(fp, " PUD: %lx\n", pmd_paddr);
FILL_PMD(pmd_paddr, PHYSADDR, PAGESIZE());
pmd = ((ulong *)pmd_paddr) + pmd_index(kvaddr);
pmd_pte = ULONG(machdep->pmd + PAGEOFFSET(pmd));
if (verbose)
fprintf(fp, " PMD: %lx => %lx [machine]\n", (ulong)pmd, pmd_pte);
if (!(pmd_pte & _PAGE_PRESENT))
goto no_kpage;
if (pmd_pte & _PAGE_PSE) {
if (verbose)
fprintf(fp, " PAGE: %lx (2MB) [machine]\n",
PAGEBASE(pmd_pte) & PHYSICAL_PAGE_MASK);
pseudo_pmd_pte = xen_m2p(PAGEBASE(pmd_pte));
if (pseudo_pmd_pte == XEN_MACHADDR_NOT_FOUND) {
if (verbose)
fprintf(fp, " PAGE: page not available\n");
*paddr = PADDR_NOT_AVAILABLE;
return FALSE;
}
pseudo_pmd_pte |= PAGEOFFSET(pmd_pte);
if (verbose) {
fprintf(fp, " PAGE: %s (2MB)\n\n",
mkstring(buf, VADDR_PRLEN, RJUST|LONG_HEX,
MKSTR(PAGEBASE(pseudo_pmd_pte) &
PHYSICAL_PAGE_MASK)));
x86_64_translate_pte(pseudo_pmd_pte, 0, 0);
}
physpage = (PAGEBASE(pseudo_pmd_pte) & PHYSICAL_PAGE_MASK) +
(kvaddr & ~_2MB_PAGE_MASK);
*paddr = physpage;
return TRUE;
}
/*
* ptep = pte_offset_map(pmd, addr);
* pte = *ptep;
*/
pte_paddr = pmd_pte & PHYSICAL_PAGE_MASK;
pte_paddr = xen_m2p(pte_paddr);
if (verbose)
fprintf(fp, " PMD: %lx\n", pte_paddr);
FILL_PTBL(pte_paddr, PHYSADDR, PAGESIZE());
ptep = ((ulong *)pte_paddr) + pte_index(kvaddr);
pte = ULONG(machdep->ptbl + PAGEOFFSET(ptep));
if (verbose)
fprintf(fp, " PTE: %lx => %lx [machine]\n", (ulong)ptep, pte);
if (!(pte & (_PAGE_PRESENT))) {
if (pte && verbose) {
fprintf(fp, "\n");
x86_64_translate_pte(pte, 0, 0);
}
goto no_kpage;
}
pseudo_pte = xen_m2p(pte & PHYSICAL_PAGE_MASK);
if (verbose)
fprintf(fp, " PTE: %lx\n", pseudo_pte + PAGEOFFSET(pte));
*paddr = (PAGEBASE(pseudo_pte) & PHYSICAL_PAGE_MASK) + PAGEOFFSET(kvaddr);
if (verbose) {
fprintf(fp, " PAGE: %lx [machine]\n",
PAGEBASE(pte) & PHYSICAL_PAGE_MASK);
fprintf(fp, " PAGE: %lx\n\n",
PAGEBASE(*paddr) & PHYSICAL_PAGE_MASK);
x86_64_translate_pte(pseudo_pte + PAGEOFFSET(pte), 0, 0);
}
return TRUE;
no_kpage:
return FALSE;
}
/*
* Determine where vmalloc'd memory starts.
*/
static ulong
x86_64_vmalloc_start(void)
{
return ((ulong)VMALLOC_START);
}
/*
* thread_info implementation makes for less accurate results here.
*/
static int
x86_64_is_task_addr(ulong task)
{
if (tt->flags & THREAD_INFO)
return IS_KVADDR(task);
else
return (IS_KVADDR(task) && (ALIGNED_STACK_OFFSET(task) == 0));
}
/*
* easy enough...
*/
static ulong
x86_64_processor_speed(void)
{
unsigned long cpu_khz = 0;
if (machdep->mhz)
return (machdep->mhz);
if (symbol_exists("cpu_khz")) {
get_symbol_data("cpu_khz", sizeof(int), &cpu_khz);
if (cpu_khz)
return(machdep->mhz = cpu_khz/1000);
}
return 0;
}
/*
* Accept or reject a symbol from the kernel namelist.
*/
static int
x86_64_verify_symbol(const char *name, ulong value, char type)
{
if (!name || !strlen(name))
return FALSE;
if (XEN_HYPER_MODE() && STREQ(name, "__per_cpu_shift"))
return TRUE;
if (!(machdep->flags & KSYMS_START)) {
if (STREQ(name, "_text") || STREQ(name, "_stext")) {
machdep->flags |= KSYMS_START;
if (!st->first_ksymbol)
st->first_ksymbol = value;
return TRUE;
} else if (STREQ(name, "__per_cpu_start")) {
st->flags |= PERCPU_SYMS;
return TRUE;
} else if (st->flags & PERCPU_SYMS) {
if (STRNEQ(name, "per_cpu") ||
STREQ(name, "__per_cpu_end"))
return TRUE;
if ((type == 'V') || (type == 'd') || (type == 'D'))
return TRUE;
}
return FALSE;
}
return TRUE;
}
/*
* Prevent base kernel pc section ranges that end with a
* vsyscall address from being accepted for kernel module
* addresses.
*/
static int
x86_64_verify_line_number(ulong pc, ulong low, ulong high)
{
if (IS_MODULE_VADDR(pc) &&
!IS_MODULE_VADDR(low) && is_vsyscall_addr(high))
return FALSE;
return TRUE;
}
/*
* Get the relevant page directory pointer from a task structure.
*/
static ulong
x86_64_get_task_pgd(ulong task)
{
return (error(FATAL, "x86_64_get_task_pgd: N/A\n"));
}
/*
* Translate a PTE, returning TRUE if the page is present.
* If a physaddr pointer is passed in, don't print anything.
*/
static int
x86_64_translate_pte(ulong pte, void *physaddr, ulonglong unused)
{
int c, others, len1, len2, len3;
ulong paddr;
char buf[BUFSIZE];
char buf2[BUFSIZE];
char buf3[BUFSIZE];
char ptebuf[BUFSIZE];
char physbuf[BUFSIZE];
char *arglist[MAXARGS];
int page_present;
paddr = pte & PHYSICAL_PAGE_MASK;
page_present = pte & (_PAGE_PRESENT | _PAGE_PROTNONE);
if (physaddr) {
*((ulong *)physaddr) = paddr;
return page_present;
}
sprintf(ptebuf, "%lx", pte);
len1 = MAX(strlen(ptebuf), strlen("PTE"));
fprintf(fp, "%s ", mkstring(buf, len1, CENTER|LJUST, "PTE"));
if (!page_present && pte) {
swap_location(pte, buf);
if ((c = parse_line(buf, arglist)) != 3)
error(FATAL, "cannot determine swap location\n");
len2 = MAX(strlen(arglist[0]), strlen("SWAP"));
len3 = MAX(strlen(arglist[2]), strlen("OFFSET"));
fprintf(fp, "%s %s\n",
mkstring(buf2, len2, CENTER|LJUST, "SWAP"),
mkstring(buf3, len3, CENTER|LJUST, "OFFSET"));
strcpy(buf2, arglist[0]);
strcpy(buf3, arglist[2]);
fprintf(fp, "%s %s %s\n",
mkstring(ptebuf, len1, CENTER|RJUST, NULL),
mkstring(buf2, len2, CENTER|RJUST, NULL),
mkstring(buf3, len3, CENTER|RJUST, NULL));
return page_present;
}
sprintf(physbuf, "%lx", paddr);
len2 = MAX(strlen(physbuf), strlen("PHYSICAL"));
fprintf(fp, "%s ", mkstring(buf, len2, CENTER|LJUST, "PHYSICAL"));
fprintf(fp, "FLAGS\n");
fprintf(fp, "%s %s ",
mkstring(ptebuf, len1, CENTER|RJUST, NULL),
mkstring(physbuf, len2, CENTER|RJUST, NULL));
fprintf(fp, "(");
others = 0;
if (pte) {
if (pte & _PAGE_PRESENT)
fprintf(fp, "%sPRESENT", others++ ? "|" : "");
if (pte & _PAGE_RW)
fprintf(fp, "%sRW", others++ ? "|" : "");
if (pte & _PAGE_USER)
fprintf(fp, "%sUSER", others++ ? "|" : "");
if (pte & _PAGE_PWT)
fprintf(fp, "%sPWT", others++ ? "|" : "");
if (pte & _PAGE_PCD)
fprintf(fp, "%sPCD", others++ ? "|" : "");
if (pte & _PAGE_ACCESSED)
fprintf(fp, "%sACCESSED", others++ ? "|" : "");
if (pte & _PAGE_DIRTY)
fprintf(fp, "%sDIRTY", others++ ? "|" : "");
if ((pte & _PAGE_PSE) && (pte & _PAGE_PRESENT))
fprintf(fp, "%sPSE", others++ ? "|" : "");
if ((pte & _PAGE_PROTNONE) && !(pte & _PAGE_PRESENT))
fprintf(fp, "%sPROTNONE", others++ ? "|" : "");
if (pte & _PAGE_GLOBAL)
fprintf(fp, "%sGLOBAL", others++ ? "|" : "");
if (pte & _PAGE_NX)
fprintf(fp, "%sNX", others++ ? "|" : "");
} else {
fprintf(fp, "no mapping");
}
fprintf(fp, ")\n");
return (page_present);
}
/*
* Look for likely exception frames in a stack.
*/
static int
x86_64_eframe_search(struct bt_info *bt)
{
int i, c, cnt, estack_index;
ulong estack, irqstack, stacksize;
ulong *up;
struct machine_specific *ms;
struct bt_info bt_local;
if (bt->flags & BT_EFRAME_SEARCH2) {
BCOPY(bt, &bt_local, sizeof(struct bt_info));
bt->flags &= ~(ulonglong)BT_EFRAME_SEARCH2;
ms = machdep->machspec;
for (c = 0; c < kt->cpus; c++) {
if ((bt->flags & BT_CPUMASK) &&
!(NUM_IN_BITMAP(bt->cpumask, c)))
continue;
if (ms->stkinfo.ibase[c] == 0)
break;
bt->hp->esp = ms->stkinfo.ibase[c];
fprintf(fp, "CPU %d IRQ STACK:", c);
if (hide_offline_cpu(c)) {
fprintf(fp, " [OFFLINE]\n\n");
continue;
} else
fprintf(fp, "\n");
if ((cnt = x86_64_eframe_search(bt)))
fprintf(fp, "\n");
else
fprintf(fp, "(none found)\n\n");
}
for (c = 0; c < kt->cpus; c++) {
if ((bt->flags & BT_CPUMASK) &&
!(NUM_IN_BITMAP(bt->cpumask, c)))
continue;
for (i = 0; i < MAX_EXCEPTION_STACKS; i++) {
if (ms->stkinfo.ebase[c][i] == 0)
break;
bt->hp->esp = ms->stkinfo.ebase[c][i];
fprintf(fp, "CPU %d %s EXCEPTION STACK:",
c, ms->stkinfo.exception_stacks[i]);
if (hide_offline_cpu(c)) {
fprintf(fp, " [OFFLINE]\n\n");
continue;
} else
fprintf(fp, "\n");
if ((cnt = x86_64_eframe_search(bt)))
fprintf(fp, "\n");
else
fprintf(fp, "(none found)\n\n");
}
}
return 0;
}
if (bt->hp && bt->hp->esp) {
ms = machdep->machspec;
bt->stkptr = bt->hp->esp;
if ((estack = x86_64_in_exception_stack(bt, &estack_index))) {
stacksize = ms->stkinfo.esize[estack_index];
bt->stackbase = estack;
bt->stacktop = estack + ms->stkinfo.esize[estack_index];
bt->stackbuf = ms->irqstack;
alter_stackbuf(bt);
} else if ((irqstack = x86_64_in_irqstack(bt))) {
stacksize = ms->stkinfo.isize;
bt->stackbase = irqstack;
bt->stacktop = irqstack + ms->stkinfo.isize;
bt->stackbuf = ms->irqstack;
alter_stackbuf(bt);
} else if (!INSTACK(bt->stkptr, bt))
error(FATAL,
"unrecognized stack address for this task: %lx\n",
bt->hp->esp);
}
stacksize = bt->stacktop - bt->stackbase - SIZE(pt_regs);
if (bt->stkptr)
i = (bt->stkptr - bt->stackbase)/sizeof(ulong);
else
i = 0;
for (cnt = 0; i <= stacksize/sizeof(ulong); i++) {
up = (ulong *)(&bt->stackbuf[i*sizeof(ulong)]);
if (x86_64_exception_frame(EFRAME_SEARCH|EFRAME_PRINT|
EFRAME_VERIFY, 0, (char *)up, bt, fp))
cnt++;
}
return cnt;
}
static void
x86_64_display_full_frame(struct bt_info *bt, ulong rsp, FILE *ofp)
{
int i, u_idx;
ulong *up;
ulong words, addr;
char buf[BUFSIZE];
if (rsp < bt->frameptr)
return;
if (!INSTACK(rsp, bt) || !INSTACK(bt->frameptr, bt))
return;
words = (rsp - bt->frameptr) / sizeof(ulong) + 1;
addr = bt->frameptr;
u_idx = (bt->frameptr - bt->stackbase)/sizeof(ulong);
for (i = 0; i < words; i++, u_idx++) {
if (!(i & 1))
fprintf(ofp, "%s %lx: ", i ? "\n" : "", addr);
up = (ulong *)(&bt->stackbuf[u_idx*sizeof(ulong)]);
fprintf(ofp, "%s ", format_stack_entry(bt, buf, *up, 0));
addr += sizeof(ulong);
}
fprintf(ofp, "\n");
}
/*
* Check a frame for a requested reference.
*/
static void
x86_64_do_bt_reference_check(struct bt_info *bt, ulong text, char *name)
{
ulong offset;
struct syment *sp = NULL;
if (!name)
sp = value_search(text, &offset);
else if (!text)
sp = symbol_search(name);
switch (bt->ref->cmdflags & (BT_REF_SYMBOL|BT_REF_HEXVAL))
{
case BT_REF_SYMBOL:
if (name) {
if (STREQ(name, bt->ref->str))
bt->ref->cmdflags |= BT_REF_FOUND;
} else {
if (sp && !offset && STREQ(sp->name, bt->ref->str))
bt->ref->cmdflags |= BT_REF_FOUND;
}
break;
case BT_REF_HEXVAL:
if (text) {
if (bt->ref->hexval == text)
bt->ref->cmdflags |= BT_REF_FOUND;
} else if (sp && (bt->ref->hexval == sp->value))
bt->ref->cmdflags |= BT_REF_FOUND;
else if (!name && !text && (bt->ref->hexval == 0))
bt->ref->cmdflags |= BT_REF_FOUND;
break;
}
}
/*
* Determine the function containing a .text.lock. reference.
*/
static ulong
text_lock_function(char *name, struct bt_info *bt, ulong locktext)
{
int c, reterror, instr, arg;
char buf[BUFSIZE];
char *arglist[MAXARGS];
char *p1;
ulong locking_func;
instr = arg = -1;
locking_func = 0;
open_tmpfile2();
if (STREQ(name, ".text.lock.spinlock"))
sprintf(buf, "x/4i 0x%lx", locktext);
else
sprintf(buf, "x/1i 0x%lx", locktext);
if (!gdb_pass_through(buf, pc->tmpfile2, GNU_RETURN_ON_ERROR)) {
close_tmpfile2();
bt->flags |= BT_FRAMESIZE_DISABLE;
return 0;
}
rewind(pc->tmpfile2);
while (fgets(buf, BUFSIZE, pc->tmpfile2)) {
c = parse_line(buf, arglist);
if (instr == -1) {
/*
* Check whether <function+offset> are
* in the output string.
*/
if (LASTCHAR(arglist[0]) == ':') {
instr = 1;
arg = 2;
} else {
instr = 2;
arg = 3;
}
}
if (c < (arg+1))
break;
if (STREQ(arglist[instr], "jmpq") || STREQ(arglist[instr], "jmp")) {
p1 = arglist[arg];
reterror = 0;
locking_func = htol(p1, RETURN_ON_ERROR, &reterror);
if (reterror)
locking_func = 0;
break;
}
}
close_tmpfile2();
if (!locking_func)
bt->flags |= BT_FRAMESIZE_DISABLE;
return locking_func;
}
/*
* As of 2.6.29, the handy check for the "error_exit:" label
* no longer applies; it became an entry point that was jmp'd to
* after the exception handler was called. Therefore, if the
* return address is an offset from any of these functions,
* then the exception frame should be checked for:
*
* .macro errorentry sym do_sym
* errorentry invalid_TSS do_invalid_TSS
* errorentry segment_not_present do_segment_not_present
* errorentry alignment_check do_alignment_check
* errorentry xen_stack_segment do_stack_segment
* errorentry general_protection do_general_protection
* errorentry page_fault do_page_fault
*
* .macro zeroentry sym do_sym
* zeroentry divide_error do_divide_error
* zeroentry overflow do_overflow
* zeroentry bounds do_bounds
* zeroentry invalid_op do_invalid_op
* zeroentry device_not_available do_device_not_available
* zeroentry coprocessor_segment_overrun do_coprocessor_segment_overrun
* zeroentry spurious_interrupt_bug do_spurious_interrupt_bug
* zeroentry coprocessor_error do_coprocessor_error
* zeroentry simd_coprocessor_error do_simd_coprocessor_error
* zeroentry xen_hypervisor_callback xen_do_hypervisor_callback
* zeroentry xen_debug do_debug
* zeroentry xen_int3 do_int3
*/
static const char *exception_functions[] = {
"invalid_TSS",
"segment_not_present",
"alignment_check",
"xen_stack_segment",
"general_protection",
"page_fault",
"divide_error",
"overflow",
"bounds",
"invalid_op",
"device_not_available",
"coprocessor_segment_overrun",
"spurious_interrupt_bug",
"coprocessor_error",
"simd_coprocessor_error",
"xen_hypervisor_callback",
"xen_debug",
"xen_int3",
"async_page_fault",
NULL,
};
/*
* print one entry of a stack trace
*/
#define BACKTRACE_COMPLETE (1)
#define BACKTRACE_ENTRY_IGNORED (2)
#define BACKTRACE_ENTRY_DISPLAYED (3)
#define BACKTRACE_ENTRY_AND_EFRAME_DISPLAYED (4)
static int
x86_64_print_stack_entry(struct bt_info *bt, FILE *ofp, int level,
int stkindex, ulong text)
{
ulong rsp, offset, locking_func;
struct syment *sp, *spl;
char *name, *name_plus_offset;
int i, result;
long eframe_check;
char buf1[BUFSIZE];
char buf2[BUFSIZE];
struct load_module *lm;
eframe_check = -1;
if (!(bt->flags & BT_SAVE_EFRAME_IP))
bt->eframe_ip = 0;
offset = 0;
sp = value_search(text, &offset);
if (!sp)
return BACKTRACE_ENTRY_IGNORED;
name = sp->name;
if (offset && (bt->flags & BT_SYMBOL_OFFSET))
name_plus_offset = value_to_symstr(text, buf2, bt->radix);
else
name_plus_offset = NULL;
if (bt->flags & BT_TEXT_SYMBOLS) {
if (bt->flags & BT_EXCEPTION_FRAME)
rsp = bt->stkptr;
else
rsp = bt->stackbase + (stkindex * sizeof(long));
fprintf(ofp, " [%s] %s at %lx",
mkstring(buf1, VADDR_PRLEN, RJUST|LONG_HEX, MKSTR(rsp)),
name_plus_offset ? name_plus_offset : name, text);
if (module_symbol(text, NULL, &lm, NULL, 0))
fprintf(ofp, " [%s]", lm->mod_name);
fprintf(ofp, "\n");
if (BT_REFERENCE_CHECK(bt))
x86_64_do_bt_reference_check(bt, text, name);
return BACKTRACE_ENTRY_DISPLAYED;
}
if (!offset && !(bt->flags & BT_EXCEPTION_FRAME) &&
!(bt->flags & BT_START)) {
if (STREQ(name, "child_rip")) {
if (symbol_exists("kernel_thread"))
name = "kernel_thread";
else if (symbol_exists("arch_kernel_thread"))
name = "arch_kernel_thread";
}
else if (!(bt->flags & BT_SCHEDULE)) {
if (STREQ(name, "error_exit"))
eframe_check = 8;
else {
if (CRASHDEBUG(2))
fprintf(ofp,
"< ignoring text symbol with no offset: %s() >\n",
sp->name);
return BACKTRACE_ENTRY_IGNORED;
}
}
}
if ((THIS_KERNEL_VERSION >= LINUX(2,6,29)) &&
(eframe_check == -1) && offset &&
!(bt->flags & (BT_EXCEPTION_FRAME|BT_START|BT_SCHEDULE))) {
for (i = 0; exception_functions[i]; i++) {
if (STREQ(name, exception_functions[i])) {
eframe_check = 8;
break;
}
}
if (x86_64_in_irqstack(bt) && strstr(name, "_interrupt"))
eframe_check = 0;
}
if (bt->flags & BT_SCHEDULE)
name = "schedule";
if (STREQ(name, "child_rip")) {
if (symbol_exists("kernel_thread"))
name = "kernel_thread";
else if (symbol_exists("arch_kernel_thread"))
name = "arch_kernel_thread";
result = BACKTRACE_COMPLETE;
} else if (STREQ(name, "cpu_idle") ||
STREQ(name, "system_call_fastpath"))
result = BACKTRACE_COMPLETE;
else
result = BACKTRACE_ENTRY_DISPLAYED;
if (bt->flags & BT_EXCEPTION_FRAME)
rsp = bt->stkptr;
else if (bt->flags & BT_START)
rsp = bt->stkptr;
else
rsp = bt->stackbase + (stkindex * sizeof(long));
if ((bt->flags & BT_FULL)) {
if (bt->frameptr)
x86_64_display_full_frame(bt, rsp, ofp);
bt->frameptr = rsp + sizeof(ulong);
}
fprintf(ofp, "%s#%d [%8lx] %s at %lx", level < 10 ? " " : "", level,
rsp, name_plus_offset ? name_plus_offset : name, text);
if (STREQ(name, "tracesys"))
fprintf(ofp, " (via system_call)");
else if (STRNEQ(name, ".text.lock.")) {
if ((locking_func = text_lock_function(name, bt, text)) &&
(spl = value_search(locking_func, &offset)))
fprintf(ofp, " (via %s)", spl->name);
}
if (module_symbol(text, NULL, &lm, NULL, 0))
fprintf(ofp, " [%s]", lm->mod_name);
if (bt->flags & BT_FRAMESIZE_DISABLE)
fprintf(ofp, " *");
fprintf(ofp, "\n");
if (bt->flags & BT_LINE_NUMBERS) {
get_line_number(text, buf1, FALSE);
if (strlen(buf1))
fprintf(ofp, " %s\n", buf1);
}
if (eframe_check >= 0) {
if (x86_64_exception_frame(EFRAME_PRINT|EFRAME_VERIFY,
bt->stackbase + (stkindex*sizeof(long)) + eframe_check,
NULL, bt, ofp))
result = BACKTRACE_ENTRY_AND_EFRAME_DISPLAYED;
}
if (BT_REFERENCE_CHECK(bt))
x86_64_do_bt_reference_check(bt, text, name);
bt->call_target = name;
if (is_direct_call_target(bt)) {
if (CRASHDEBUG(2))
fprintf(ofp, "< enable BT_CHECK_CALLER for %s >\n",
bt->call_target);
bt->flags |= BT_CHECK_CALLER;
} else {
if (CRASHDEBUG(2) && (bt->flags & BT_CHECK_CALLER))
fprintf(ofp, "< disable BT_CHECK_CALLER for %s >\n",
bt->call_target);
if (bt->flags & BT_CHECK_CALLER) {
if (CRASHDEBUG(2))
fprintf(ofp, "< set BT_NO_CHECK_CALLER >\n");
bt->flags |= BT_NO_CHECK_CALLER;
}
bt->flags &= ~(ulonglong)BT_CHECK_CALLER;
}
return result;
}
/*
* Unroll a kernel stack.
*/
static void
x86_64_back_trace_cmd(struct bt_info *bt)
{
error(FATAL, "x86_64_back_trace_cmd: TBD\n");
}
/*
* Determine whether the initial stack pointer is located in one of the
* exception stacks.
*/
static ulong
x86_64_in_exception_stack(struct bt_info *bt, int *estack_index)
{
int c, i;
ulong rsp;
ulong estack;
struct machine_specific *ms;
rsp = bt->stkptr;
ms = machdep->machspec;
estack = 0;
for (c = 0; !estack && (c < kt->cpus); c++) {
for (i = 0; i < MAX_EXCEPTION_STACKS; i++) {
if (ms->stkinfo.ebase[c][i] == 0)
break;
if ((rsp >= ms->stkinfo.ebase[c][i]) &&
(rsp < (ms->stkinfo.ebase[c][i] +
ms->stkinfo.esize[i]))) {
estack = ms->stkinfo.ebase[c][i];
if (estack_index)
*estack_index = i;
if (CRASHDEBUG(1) && (c != bt->tc->processor))
error(INFO,
"task cpu: %d exception stack cpu: %d\n",
bt->tc->processor, c);
break;
}
}
}
return estack;
}
/*
* Determine whether the current stack pointer is in a cpu's irqstack.
*/
static ulong
x86_64_in_irqstack(struct bt_info *bt)
{
int c;
ulong rsp;
ulong irqstack;
struct machine_specific *ms;
rsp = bt->stkptr;
ms = machdep->machspec;
irqstack = 0;
for (c = 0; !irqstack && (c < kt->cpus); c++) {
if (ms->stkinfo.ibase[c] == 0)
break;
if ((rsp >= ms->stkinfo.ibase[c]) &&
(rsp < (ms->stkinfo.ibase[c] + ms->stkinfo.isize))) {
irqstack = ms->stkinfo.ibase[c];
if (CRASHDEBUG(1) && (c != bt->tc->processor))
error(INFO,
"task cpu: %d IRQ stack cpu: %d\n",
bt->tc->processor, c);
break;
}
}
return irqstack;
}
static int
x86_64_in_alternate_stack(int cpu, ulong rsp)
{
int i;
struct machine_specific *ms;
if (cpu >= NR_CPUS)
return FALSE;
ms = machdep->machspec;
if (ms->stkinfo.ibase[cpu] &&
(rsp >= ms->stkinfo.ibase[cpu]) &&
(rsp < (ms->stkinfo.ibase[cpu] + ms->stkinfo.isize)))
return TRUE;
for (i = 0; i < MAX_EXCEPTION_STACKS; i++) {
if (ms->stkinfo.ebase[cpu][i] &&
(rsp >= ms->stkinfo.ebase[cpu][i]) &&
(rsp < (ms->stkinfo.ebase[cpu][i] + ms->stkinfo.esize[i])))
return TRUE;
}
return FALSE;
}
#define STACK_TRANSITION_ERRMSG_E_I_P \
"cannot transition from exception stack to IRQ stack to current process stack:\n exception stack pointer: %lx\n IRQ stack pointer: %lx\n process stack pointer: %lx\n current stack base: %lx\n"
#define STACK_TRANSITION_ERRMSG_E_P \
"cannot transition from exception stack to current process stack:\n exception stack pointer: %lx\n process stack pointer: %lx\n current stack base: %lx\n"
#define STACK_TRANSITION_ERRMSG_I_P \
"cannot transition from IRQ stack to current process stack:\n IRQ stack pointer: %lx\n process stack pointer: %lx\n current stack base: %lx\n"
/*
* Low-budget back tracer -- dump text return addresses, following call chain
* when possible, along with any verifiable exception frames.
*/
static void
x86_64_low_budget_back_trace_cmd(struct bt_info *bt_in)
{
int i, level, done, framesize, estack_index;
ulong rsp, offset, stacktop;
ulong *up;
long cs;
struct syment *sp, *spt;
FILE *ofp;
ulong estack, irqstack;
ulong irq_eframe;
struct bt_info bt_local, *bt;
struct machine_specific *ms;
ulong last_process_stack_eframe;
ulong user_mode_eframe;
char *rip_symbol;
/*
* User may have made a run-time switch.
*/
if (kt->flags & DWARF_UNWIND) {
machdep->back_trace = x86_64_dwarf_back_trace_cmd;
x86_64_dwarf_back_trace_cmd(bt_in);
return;
}
bt = &bt_local;
BCOPY(bt_in, bt, sizeof(struct bt_info));
if (bt->flags & BT_FRAMESIZE_DEBUG) {
x86_64_framesize_debug(bt);
return;
}
level = 0;
done = FALSE;
irq_eframe = 0;
last_process_stack_eframe = 0;
bt->call_target = NULL;
rsp = bt->stkptr;
ms = machdep->machspec;
if (BT_REFERENCE_CHECK(bt))
ofp = pc->nullfp;
else
ofp = fp;
/* If rsp is in user stack, the memory may not be included in vmcore, and
* we only output the register's value. So it's not necessary to check
* whether it can be accessible.
*/
if (!(bt->flags & BT_USER_SPACE) && (!rsp || !accessible(rsp))) {
error(INFO, "cannot determine starting stack pointer\n");
if (KVMDUMP_DUMPFILE())
kvmdump_display_regs(bt->tc->processor, ofp);
else if (ELF_NOTES_VALID() && DISKDUMP_DUMPFILE())
diskdump_display_regs(bt->tc->processor, ofp);
else if (SADUMP_DUMPFILE())
sadump_display_regs(bt->tc->processor, ofp);
return;
}
if (bt->flags & BT_TEXT_SYMBOLS) {
if ((bt->flags & BT_USER_SPACE) &&
!(bt->flags & BT_TEXT_SYMBOLS_ALL))
return;
if (!(bt->flags & BT_TEXT_SYMBOLS_ALL))
fprintf(ofp, "%sSTART: %s%s at %lx\n",
space(VADDR_PRLEN > 8 ? 14 : 6),
closest_symbol(bt->instptr),
STREQ(closest_symbol(bt->instptr), "thread_return") ?
" (schedule)" : "",
bt->instptr);
} else if (bt->flags & BT_USER_SPACE) {
fprintf(ofp, " [exception RIP: user space]\n");
if (KVMDUMP_DUMPFILE())
kvmdump_display_regs(bt->tc->processor, ofp);
else if (ELF_NOTES_VALID() && DISKDUMP_DUMPFILE())
diskdump_display_regs(bt->tc->processor, ofp);
else if (SADUMP_DUMPFILE())
sadump_display_regs(bt->tc->processor, ofp);
else if (pc->flags2 & QEMU_MEM_DUMP_ELF)
display_regs_from_elf_notes(bt->tc->processor, ofp);
return;
} else if ((bt->flags & BT_KERNEL_SPACE) &&
(KVMDUMP_DUMPFILE() ||
(ELF_NOTES_VALID() && DISKDUMP_DUMPFILE()) ||
SADUMP_DUMPFILE() || (pc->flags2 & QEMU_MEM_DUMP_ELF))) {
fprintf(ofp, " [exception RIP: ");
if ((sp = value_search(bt->instptr, &offset))) {
fprintf(ofp, "%s", sp->name);
if (offset)
fprintf(ofp, (*gdb_output_radix == 16) ?
"+0x%lx" : "+%ld", offset);
} else
fprintf(ofp, "unknown or invalid address");
fprintf(ofp, "]\n");
if (KVMDUMP_DUMPFILE())
kvmdump_display_regs(bt->tc->processor, ofp);
else if (ELF_NOTES_VALID() && DISKDUMP_DUMPFILE())
diskdump_display_regs(bt->tc->processor, ofp);
else if (SADUMP_DUMPFILE())
sadump_display_regs(bt->tc->processor, ofp);
else if (pc->flags2 & QEMU_MEM_DUMP_ELF)
display_regs_from_elf_notes(bt->tc->processor, ofp);
} else if (bt->flags & BT_START) {
x86_64_print_stack_entry(bt, ofp, level,
0, bt->instptr);
bt->flags &= ~BT_START;
level++;
}
if ((estack = x86_64_in_exception_stack(bt, &estack_index))) {
in_exception_stack:
bt->flags |= BT_EXCEPTION_STACK;
/*
* The stack buffer will have been loaded with the process
* stack, so switch to the indicated exception stack.
*/
bt->stackbase = estack;
bt->stacktop = estack + ms->stkinfo.esize[estack_index];
bt->stackbuf = ms->irqstack;
if (!readmem(bt->stackbase, KVADDR, bt->stackbuf,
bt->stacktop - bt->stackbase,
bt->hp && (bt->hp->esp == bt->stkptr) ?
"irqstack contents via hook" : "irqstack contents",
RETURN_ON_ERROR))
error(FATAL, "read of exception stack at %lx failed\n",
bt->stackbase);
/*
* If irq_eframe is set, we've jumped back here from the
* IRQ stack dump below. Do basically the same thing as if
* had come from the processor stack, but presume that we
* must have been in kernel mode, i.e., took an exception
* while operating on an IRQ stack. (untested)
*/
if (irq_eframe) {
bt->flags |= BT_EXCEPTION_FRAME;
i = (irq_eframe - bt->stackbase)/sizeof(ulong);
x86_64_print_stack_entry(bt, ofp, level, i,
bt->instptr);
bt->flags &= ~(ulonglong)BT_EXCEPTION_FRAME;
cs = x86_64_exception_frame(EFRAME_PRINT|EFRAME_CS, 0,
bt->stackbuf + (irq_eframe - bt->stackbase),
bt, ofp);
rsp += SIZE(pt_regs); /* guaranteed kernel mode */
if (bt->eframe_ip && ((framesize = x86_64_get_framesize(bt,
bt->eframe_ip, rsp)) >= 0))
rsp += framesize;
level++;
irq_eframe = 0;
}
stacktop = bt->stacktop - SIZE(pt_regs);
if ((machdep->flags & NESTED_NMI) && estack_index == NMI_STACK)
stacktop -= 12*sizeof(ulong);
bt->flags &= ~BT_FRAMESIZE_DISABLE;
for (i = (rsp - bt->stackbase)/sizeof(ulong);
!done && (rsp < stacktop); i++, rsp += sizeof(ulong)) {
up = (ulong *)(&bt->stackbuf[i*sizeof(ulong)]);
if (!is_kernel_text(*up))
continue;
switch (x86_64_print_stack_entry(bt, ofp, level, i,*up))
{
case BACKTRACE_ENTRY_AND_EFRAME_DISPLAYED:
rsp += SIZE(pt_regs);
i += SIZE(pt_regs)/sizeof(ulong);
if (!bt->eframe_ip) {
level++;
break;
} /* else fall through */
case BACKTRACE_ENTRY_DISPLAYED:
level++;
if ((framesize = x86_64_get_framesize(bt,
bt->eframe_ip ? bt->eframe_ip : *up, rsp)) >= 0) {
rsp += framesize;
i += framesize/sizeof(ulong);
}
break;
case BACKTRACE_ENTRY_IGNORED:
break;
case BACKTRACE_COMPLETE:
done = TRUE;
break;
}
}
cs = x86_64_exception_frame(EFRAME_PRINT|EFRAME_CS, 0,
bt->stackbuf + (stacktop - bt->stackbase),
bt, ofp);
if (!BT_REFERENCE_CHECK(bt))
fprintf(fp, "--- <%s exception stack> ---\n",
ms->stkinfo.exception_stacks[estack_index]);
/*
* Find the CPU-saved, or handler-saved registers
*/
up = (ulong *)(&bt->stackbuf[bt->stacktop - bt->stackbase]);
up -= 5;
if ((machdep->flags & NESTED_NMI) &&
estack_index == NMI_STACK &&
bt->stkptr <= bt->stacktop - 17*sizeof(ulong)) {
up -= 12;
/* Copied and saved regs are swapped in pre-3.8 kernels */
if (*up == symbol_value("repeat_nmi"))
up += 5;
}
/* Registers (as saved by CPU):
*
* up[4] SS
* up[3] RSP
* up[2] RFLAGS
* up[1] CS
* up[0] RIP
*/
rsp = bt->stkptr = up[3];
bt->instptr = up[0];
if (cs & 3)
done = TRUE; /* user-mode exception */
else
done = FALSE; /* kernel-mode exception */
bt->frameptr = 0;
/*
* Print the return values from the estack end.
*/
if (!done) {
bt->flags |= BT_START|BT_SAVE_EFRAME_IP;
x86_64_print_stack_entry(bt, ofp, level,
0, bt->instptr);
bt->flags &=
~(BT_START|BT_SAVE_EFRAME_IP|BT_FRAMESIZE_DISABLE);
/*
* Protect against exception stack recursion.
*/
if (x86_64_in_exception_stack(bt, NULL) == estack) {
fprintf(ofp,
" [ %s exception stack recursion: "
"prior stack location overwritten ]\n",
ms->stkinfo.exception_stacks[estack_index]);
return;
}
level++;
if ((framesize = x86_64_get_framesize(bt, bt->instptr, rsp)) >= 0)
rsp += framesize;
}
}
/*
* IRQ stack entry always comes in via the process stack, regardless
* whether it happened while running in user or kernel space.
*/
if (!done && (irqstack = x86_64_in_irqstack(bt))) {
bt->flags |= BT_IRQSTACK;
/*
* Until coded otherwise, the stackbase will be pointing to
* either the exception stack or, more likely, the process
* stack base. Switch it to the IRQ stack.
*/
bt->stackbase = irqstack;
bt->stacktop = irqstack + ms->stkinfo.isize;
bt->stackbuf = ms->irqstack;
if (!readmem(bt->stackbase, KVADDR,
bt->stackbuf, bt->stacktop - bt->stackbase,
bt->hp && (bt->hp->esp == bt_in->stkptr) ?
"irqstack contents via hook" : "irqstack contents",
RETURN_ON_ERROR))
error(FATAL, "read of IRQ stack at %lx failed\n",
bt->stackbase);
stacktop = bt->stacktop - 64; /* from kernel code */
bt->flags &= ~BT_FRAMESIZE_DISABLE;
for (i = (rsp - bt->stackbase)/sizeof(ulong);
!done && (rsp < stacktop); i++, rsp += sizeof(ulong)) {
up = (ulong *)(&bt->stackbuf[i*sizeof(ulong)]);
if (!is_kernel_text(*up))
continue;
switch (x86_64_print_stack_entry(bt, ofp, level, i,*up))
{
case BACKTRACE_ENTRY_AND_EFRAME_DISPLAYED:
rsp += SIZE(pt_regs);
i += SIZE(pt_regs)/sizeof(ulong);
if (!bt->eframe_ip) {
level++;
break;
} /* else fall through */
case BACKTRACE_ENTRY_DISPLAYED:
level++;
if ((framesize = x86_64_get_framesize(bt,
bt->eframe_ip ? bt->eframe_ip : *up, rsp)) >= 0) {
rsp += framesize;
i += framesize/sizeof(ulong);
}
break;
case BACKTRACE_ENTRY_IGNORED:
break;
case BACKTRACE_COMPLETE:
done = TRUE;
break;
}
}
if (!BT_REFERENCE_CHECK(bt))
fprintf(fp, "--- <IRQ stack> ---\n");
/*
* stack = (unsigned long *) (irqstack_end[-1]);
* (where irqstack_end is 64 bytes below page end)
*/
up = (ulong *)(&bt->stackbuf[stacktop - bt->stackbase]);
up -= 1;
irq_eframe = rsp = bt->stkptr = x86_64_irq_eframe_link(*up, bt, ofp);
up -= 1;
bt->instptr = *up;
/*
* No exception frame when coming from call_softirq.
*/
if ((sp = value_search(bt->instptr, &offset)) &&
STREQ(sp->name, "call_softirq"))
irq_eframe = 0;
bt->frameptr = 0;
done = FALSE;
} else
irq_eframe = 0;
if (!done && (estack = x86_64_in_exception_stack(bt, &estack_index)))
goto in_exception_stack;
if (!done && (bt->flags & (BT_EXCEPTION_STACK|BT_IRQSTACK))) {
/*
* Verify that the rsp pointer taken from either the
* exception or IRQ stack points into the process stack.
*/
bt->stackbase = GET_STACKBASE(bt->tc->task);
bt->stacktop = GET_STACKTOP(bt->tc->task);
if (!INSTACK(rsp, bt)) {
switch (bt->flags & (BT_EXCEPTION_STACK|BT_IRQSTACK))
{
case (BT_EXCEPTION_STACK|BT_IRQSTACK):
error(FATAL, STACK_TRANSITION_ERRMSG_E_I_P,
bt_in->stkptr, bt->stkptr, rsp,
bt->stackbase);
case BT_EXCEPTION_STACK:
if (in_user_stack(bt->tc->task, rsp)) {
done = TRUE;
break;
}
if (STREQ(closest_symbol(bt->instptr),
"ia32_sysenter_target")) {
/*
* RSP 0 from MSR_IA32_SYSENTER_ESP?
*/
if (rsp == 0)
return;
done = TRUE;
break;
}
error(FATAL, STACK_TRANSITION_ERRMSG_E_P,
bt_in->stkptr, rsp, bt->stackbase);
case BT_IRQSTACK:
error(FATAL, STACK_TRANSITION_ERRMSG_I_P,
bt_in->stkptr, rsp, bt->stackbase);
}
}
/*
* Now fill the local stack buffer from the process stack.
*/
if (!readmem(bt->stackbase, KVADDR, bt->stackbuf,
bt->stacktop - bt->stackbase,
"irqstack contents", RETURN_ON_ERROR))
error(FATAL, "read of process stack at %lx failed\n",
bt->stackbase);
}
/*
* For a normally blocked task, hand-create the first level(s).
* associated with __schedule() and/or schedule().
*/
if (!done &&
!(bt->flags & (BT_TEXT_SYMBOLS|BT_EXCEPTION_STACK|BT_IRQSTACK)) &&
(rip_symbol = closest_symbol(bt->instptr)) &&
(STREQ(rip_symbol, "thread_return") ||
STREQ(rip_symbol, "schedule") ||
STREQ(rip_symbol, "__schedule"))) {
if (STREQ(rip_symbol, "__schedule")) {
i = (rsp - bt->stackbase)/sizeof(ulong);
x86_64_print_stack_entry(bt, ofp, level,
i, bt->instptr);
level++;
rsp = __schedule_frame_adjust(rsp, bt);
if (STREQ(closest_symbol(bt->instptr), "schedule"))
bt->flags |= BT_SCHEDULE;
} else
bt->flags |= BT_SCHEDULE;
if (bt->flags & BT_SCHEDULE) {
i = (rsp - bt->stackbase)/sizeof(ulong);
x86_64_print_stack_entry(bt, ofp, level,
i, bt->instptr);
bt->flags &= ~(ulonglong)BT_SCHEDULE;
rsp += sizeof(ulong);
level++;
}
}
/*
* Dump the IRQ exception frame from the process stack.
* If the CS register indicates a user exception frame,
* then set done to TRUE to avoid the process stack walk-through.
* Otherwise, bump up the rsp past the kernel-mode eframe.
*/
if (irq_eframe) {
bt->flags |= BT_EXCEPTION_FRAME;
i = (irq_eframe - bt->stackbase)/sizeof(ulong);
x86_64_print_stack_entry(bt, ofp, level, i, bt->instptr);
bt->flags &= ~(ulonglong)BT_EXCEPTION_FRAME;
cs = x86_64_exception_frame(EFRAME_PRINT|EFRAME_CS, 0,
bt->stackbuf + (irq_eframe - bt->stackbase), bt, ofp);
if (cs & 3)
done = TRUE; /* IRQ from user-mode */
else {
if (x86_64_print_eframe_location(rsp, level, ofp))
level++;
rsp += SIZE(pt_regs);
irq_eframe = 0;
bt->flags |= BT_EFRAME_TARGET;
if (bt->eframe_ip && ((framesize = x86_64_get_framesize(bt,
bt->eframe_ip, rsp)) >= 0))
rsp += framesize;
bt->flags &= ~BT_EFRAME_TARGET;
}
level++;
}
/*
* Walk the process stack.
*/
bt->flags &= ~BT_FRAMESIZE_DISABLE;
for (i = (rsp - bt->stackbase)/sizeof(ulong);
!done && (rsp < bt->stacktop); i++, rsp += sizeof(ulong)) {
up = (ulong *)(&bt->stackbuf[i*sizeof(ulong)]);
if (!is_kernel_text(*up))
continue;
if ((bt->flags & BT_CHECK_CALLER)) {
/*
* A non-zero offset value from the value_search()
* lets us know if it's a real text return address.
*/
if (!(spt = value_search(*up, &offset)))
continue;
if (!offset && !(bt->flags & BT_FRAMESIZE_DISABLE))
continue;
/*
* sp gets the syment of the function that the text
* routine above called before leaving its return
* address on the stack -- if it can be determined.
*/
sp = x86_64_function_called_by((*up)-5);
if (sp == NULL) {
/*
* We were unable to get the called function.
* If the text address had an offset, then
* it must have made an indirect call, and
* can't have called our target function.
*/
if (offset) {
if (CRASHDEBUG(1))
fprintf(ofp,
"< ignoring %s() -- makes indirect call and NOT %s()>\n",
spt->name,
bt->call_target);
continue;
}
} else if ((machdep->flags & SCHED_TEXT) &&
STREQ(bt->call_target, "schedule") &&
STREQ(sp->name, "__sched_text_start")) {
; /* bait and switch */
} else if (!STREQ(sp->name, bt->call_target)) {
/*
* We got function called by the text routine,
* but it's not our target function.
*/
if (CRASHDEBUG(2))
fprintf(ofp,
"< ignoring %s() -- calls %s() and NOT %s()>\n",
spt->name, sp->name,
bt->call_target);
continue;
}
}
switch (x86_64_print_stack_entry(bt, ofp, level, i,*up))
{
case BACKTRACE_ENTRY_AND_EFRAME_DISPLAYED:
last_process_stack_eframe = rsp + 8;
if (x86_64_print_eframe_location(last_process_stack_eframe, level, ofp))
level++;
rsp += SIZE(pt_regs);
i += SIZE(pt_regs)/sizeof(ulong);
if (!bt->eframe_ip) {
level++;
break;
} /* else fall through */
case BACKTRACE_ENTRY_DISPLAYED:
level++;
if ((framesize = x86_64_get_framesize(bt,
bt->eframe_ip ? bt->eframe_ip : *up, rsp)) >= 0) {
rsp += framesize;
i += framesize/sizeof(ulong);
}
break;
case BACKTRACE_ENTRY_IGNORED:
break;
case BACKTRACE_COMPLETE:
done = TRUE;
break;
}
}
if (!irq_eframe && !is_kernel_thread(bt->tc->task) &&
(GET_STACKBASE(bt->tc->task) == bt->stackbase)) {
user_mode_eframe = bt->stacktop - SIZE(pt_regs);
if (last_process_stack_eframe < user_mode_eframe)
x86_64_exception_frame(EFRAME_PRINT, 0, bt->stackbuf +
(bt->stacktop - bt->stackbase) - SIZE(pt_regs),
bt, ofp);
}
if (bt->flags & BT_TEXT_SYMBOLS) {
if (BT_REFERENCE_FOUND(bt)) {
print_task_header(fp, task_to_context(bt->task), 0);
BCOPY(bt_in, bt, sizeof(struct bt_info));
bt->ref = NULL;
machdep->back_trace(bt);
fprintf(fp, "\n");
}
}
}
/*
* Use dwarf CFI encodings to correctly follow the call chain.
*/
static void
x86_64_dwarf_back_trace_cmd(struct bt_info *bt_in)
{
int i, level, done, estack_index;
ulong rsp, offset, stacktop;
ulong *up;
long cs;
struct syment *sp;
FILE *ofp;
ulong estack, irqstack;
ulong irq_eframe;
struct bt_info bt_local, *bt;
struct machine_specific *ms;
ulong last_process_stack_eframe;
ulong user_mode_eframe;
/*
* User may have made a run-time switch.
*/
if (!(kt->flags & DWARF_UNWIND)) {
machdep->back_trace = x86_64_low_budget_back_trace_cmd;
x86_64_low_budget_back_trace_cmd(bt_in);
return;
}
bt = &bt_local;
BCOPY(bt_in, bt, sizeof(struct bt_info));
if (bt->flags & BT_FRAMESIZE_DEBUG) {
dwarf_debug(bt);
return;
}
level = 0;
done = FALSE;
irq_eframe = 0;
last_process_stack_eframe = 0;
bt->call_target = NULL;
bt->bptr = 0;
rsp = bt->stkptr;
if (!rsp) {
error(INFO, "cannot determine starting stack pointer\n");
return;
}
ms = machdep->machspec;
if (BT_REFERENCE_CHECK(bt))
ofp = pc->nullfp;
else
ofp = fp;
if (bt->flags & BT_TEXT_SYMBOLS) {
if (!(bt->flags & BT_TEXT_SYMBOLS_ALL))
fprintf(ofp, "%sSTART: %s%s at %lx\n",
space(VADDR_PRLEN > 8 ? 14 : 6),
closest_symbol(bt->instptr),
STREQ(closest_symbol(bt->instptr), "thread_return") ?
" (schedule)" : "",
bt->instptr);
} else if (bt->flags & BT_START) {
x86_64_print_stack_entry(bt, ofp, level,
0, bt->instptr);
bt->flags &= ~BT_START;
level++;
}
if ((estack = x86_64_in_exception_stack(bt, &estack_index))) {
in_exception_stack:
bt->flags |= BT_EXCEPTION_STACK;
/*
* The stack buffer will have been loaded with the process
* stack, so switch to the indicated exception stack.
*/
bt->stackbase = estack;
bt->stacktop = estack + ms->stkinfo.esize[estack_index];
bt->stackbuf = ms->irqstack;
if (!readmem(bt->stackbase, KVADDR, bt->stackbuf,
bt->stacktop - bt->stackbase,
bt->hp && (bt->hp->esp == bt->stkptr) ?
"irqstack contents via hook" : "irqstack contents",
RETURN_ON_ERROR))
error(FATAL, "read of exception stack at %lx failed\n",
bt->stackbase);
/*
* If irq_eframe is set, we've jumped back here from the
* IRQ stack dump below. Do basically the same thing as if
* had come from the processor stack, but presume that we
* must have been in kernel mode, i.e., took an exception
* while operating on an IRQ stack. (untested)
*/
if (irq_eframe) {
bt->flags |= BT_EXCEPTION_FRAME;
i = (irq_eframe - bt->stackbase)/sizeof(ulong);
x86_64_print_stack_entry(bt, ofp, level, i,
bt->instptr);
bt->flags &= ~(ulonglong)BT_EXCEPTION_FRAME;
cs = x86_64_exception_frame(EFRAME_PRINT|EFRAME_CS, 0,
bt->stackbuf + (irq_eframe - bt->stackbase),
bt, ofp);
rsp += SIZE(pt_regs); /* guaranteed kernel mode */
level++;
irq_eframe = 0;
}
stacktop = bt->stacktop - SIZE(pt_regs);
if ((machdep->flags & NESTED_NMI) &&
estack_index == NMI_STACK)
stacktop -= 12*sizeof(ulong);
if (!done) {
level = dwarf_backtrace(bt, level, stacktop);
done = TRUE;
}
cs = x86_64_exception_frame(EFRAME_PRINT|EFRAME_CS, 0,
bt->stackbuf + (stacktop - bt->stackbase),
bt, ofp);
if (!BT_REFERENCE_CHECK(bt))
fprintf(fp, "--- <exception stack> ---\n");
/*
* Find the CPU-saved, or handler-saved registers
*/
up = (ulong *)(&bt->stackbuf[bt->stacktop - bt->stackbase]);
up -= 5;
if ((machdep->flags & NESTED_NMI) &&
estack_index == NMI_STACK &&
bt->stkptr <= bt->stacktop - 17*sizeof(ulong)) {
up -= 12;
/* Copied and saved regs are swapped in pre-3.8 kernels */
if (*up == symbol_value("repeat_nmi"))
up += 5;
}
/* Registers (as saved by CPU):
*
* up[4] SS
* up[3] RSP
* up[2] RFLAGS
* up[1] CS
* up[0] RIP
*/
rsp = bt->stkptr = up[3];
bt->instptr = up[0];
if (cs & 3)
done = TRUE; /* user-mode exception */
else
done = FALSE; /* kernel-mode exception */
bt->frameptr = 0;
/*
* Print the return values from the estack end.
*/
if (!done) {
bt->flags |= BT_START;
x86_64_print_stack_entry(bt, ofp, level,
0, bt->instptr);
bt->flags &= ~BT_START;
level++;
}
}
/*
* IRQ stack entry always comes in via the process stack, regardless
* whether it happened while running in user or kernel space.
*/
if (!done && (irqstack = x86_64_in_irqstack(bt))) {
bt->flags |= BT_IRQSTACK;
/*
* Until coded otherwise, the stackbase will be pointing to
* either the exception stack or, more likely, the process
* stack base. Switch it to the IRQ stack.
*/
bt->stackbase = irqstack;
bt->stacktop = irqstack + ms->stkinfo.isize;
bt->stackbuf = ms->irqstack;
if (!readmem(bt->stackbase, KVADDR,
bt->stackbuf, bt->stacktop - bt->stackbase,
bt->hp && (bt->hp->esp == bt_in->stkptr) ?
"irqstack contents via hook" : "irqstack contents",
RETURN_ON_ERROR))
error(FATAL, "read of IRQ stack at %lx failed\n",
bt->stackbase);
stacktop = bt->stacktop - 64; /* from kernel code */
if (!done) {
level = dwarf_backtrace(bt, level, stacktop);
done = TRUE;
}
if (!BT_REFERENCE_CHECK(bt))
fprintf(fp, "--- <IRQ stack> ---\n");
/*
* stack = (unsigned long *) (irqstack_end[-1]);
* (where irqstack_end is 64 bytes below page end)
*/
up = (ulong *)(&bt->stackbuf[stacktop - bt->stackbase]);
up -= 1;
irq_eframe = rsp = bt->stkptr = (*up) - ms->irq_eframe_link;
up -= 1;
bt->instptr = *up;
/*
* No exception frame when coming from call_softirq.
*/
if ((sp = value_search(bt->instptr, &offset)) &&
STREQ(sp->name, "call_softirq"))
irq_eframe = 0;
bt->frameptr = 0;
done = FALSE;
} else
irq_eframe = 0;
if (!done && (estack = x86_64_in_exception_stack(bt, &estack_index)))
goto in_exception_stack;
if (!done && (bt->flags & (BT_EXCEPTION_STACK|BT_IRQSTACK))) {
/*
* Verify that the rsp pointer taken from either the
* exception or IRQ stack points into the process stack.
*/
bt->stackbase = GET_STACKBASE(bt->tc->task);
bt->stacktop = GET_STACKTOP(bt->tc->task);
if (!INSTACK(rsp, bt)) {
switch (bt->flags & (BT_EXCEPTION_STACK|BT_IRQSTACK))
{
case (BT_EXCEPTION_STACK|BT_IRQSTACK):
error(FATAL, STACK_TRANSITION_ERRMSG_E_I_P,
bt_in->stkptr, bt->stkptr, rsp,
bt->stackbase);
case BT_EXCEPTION_STACK:
error(FATAL, STACK_TRANSITION_ERRMSG_E_P,
bt_in->stkptr, rsp, bt->stackbase);
case BT_IRQSTACK:
error(FATAL, STACK_TRANSITION_ERRMSG_I_P,
bt_in->stkptr, rsp, bt->stackbase);
}
}
/*
* Now fill the local stack buffer from the process stack.
*/
if (!readmem(bt->stackbase, KVADDR, bt->stackbuf,
bt->stacktop - bt->stackbase,
"irqstack contents", RETURN_ON_ERROR))
error(FATAL, "read of process stack at %lx failed\n",
bt->stackbase);
}
/*
* Dump the IRQ exception frame from the process stack.
* If the CS register indicates a user exception frame,
* then set done to TRUE to avoid the process stack walk-through.
* Otherwise, bump up the rsp past the kernel-mode eframe.
*/
if (irq_eframe) {
bt->flags |= BT_EXCEPTION_FRAME;
level = dwarf_print_stack_entry(bt, level);
bt->flags &= ~(ulonglong)BT_EXCEPTION_FRAME;
cs = x86_64_exception_frame(EFRAME_PRINT|EFRAME_CS, 0,
bt->stackbuf + (irq_eframe - bt->stackbase), bt, ofp);
if (cs & 3)
done = TRUE; /* IRQ from user-mode */
else {
if (x86_64_print_eframe_location(rsp, level, ofp))
level++;
rsp += SIZE(pt_regs);
irq_eframe = 0;
}
level++;
}
/*
* Walk the process stack.
*/
if (!done) {
level = dwarf_backtrace(bt, level, bt->stacktop);
done = TRUE;
}
if (!irq_eframe && !is_kernel_thread(bt->tc->task) &&
(GET_STACKBASE(bt->tc->task) == bt->stackbase)) {
user_mode_eframe = bt->stacktop - SIZE(pt_regs);
if (last_process_stack_eframe < user_mode_eframe)
x86_64_exception_frame(EFRAME_PRINT, 0, bt->stackbuf +
(bt->stacktop - bt->stackbase) - SIZE(pt_regs),
bt, ofp);
}
if (bt->flags & BT_TEXT_SYMBOLS) {
if (BT_REFERENCE_FOUND(bt)) {
print_task_header(fp, task_to_context(bt->task), 0);
BCOPY(bt_in, bt, sizeof(struct bt_info));
bt->ref = NULL;
machdep->back_trace(bt);
fprintf(fp, "\n");
}
}
}
/*
* Functions that won't be called indirectly.
* Add more to this as they are discovered.
*/
static const char *direct_call_targets[] = {
"schedule",
"schedule_timeout",
NULL
};
static int
is_direct_call_target(struct bt_info *bt)
{
int i;
if (!bt->call_target || (bt->flags & BT_NO_CHECK_CALLER))
return FALSE;
if (strstr(bt->call_target, "schedule") &&
is_task_active(bt->task))
return FALSE;
for (i = 0; direct_call_targets[i]; i++) {
if (STREQ(direct_call_targets[i], bt->call_target))
return TRUE;
}
return FALSE;
}
static struct syment *
x86_64_function_called_by(ulong rip)
{
struct syment *sp;
char buf[BUFSIZE], *p1;
ulong value, offset;
unsigned char byte;
value = 0;
sp = NULL;
if (!readmem(rip, KVADDR, &byte, sizeof(unsigned char), "call byte",
QUIET|RETURN_ON_ERROR))
return sp;
if (byte != 0xe8)
return sp;
sprintf(buf, "x/i 0x%lx", rip);
open_tmpfile2();
if (gdb_pass_through(buf, pc->tmpfile2, GNU_RETURN_ON_ERROR)) {
rewind(pc->tmpfile2);
while (fgets(buf, BUFSIZE, pc->tmpfile2)) {
if ((p1 = strstr(buf, "callq")) &&
whitespace(*(p1-1))) {
if (extract_hex(p1, &value, NULLCHAR, TRUE))
break;
}
}
}
close_tmpfile2();
if (value)
sp = value_search(value, &offset);
/*
* Functions that jmp to schedule() or schedule_timeout().
*/
if (sp) {
if ((STREQ(sp->name, "schedule_timeout_interruptible") ||
STREQ(sp->name, "schedule_timeout_uninterruptible")))
sp = symbol_search("schedule_timeout");
if (STREQ(sp->name, "__cond_resched"))
sp = symbol_search("schedule");
}
return sp;
}
/*
* Unroll the kernel stack using a minimal amount of gdb services.
*/
static void
x86_64_back_trace(struct gnu_request *req, struct bt_info *bt)
{
error(FATAL, "x86_64_back_trace: unused\n");
}
/*
* Print exception frame information for x86_64.
*
* Pid: 0, comm: swapper Not tainted 2.6.5-1.360phro.rootsmp
* RIP: 0010:[<ffffffff8010f534>] <ffffffff8010f534>{default_idle+36}
* RSP: 0018:ffffffff8048bfd8 EFLAGS: 00000246
* RAX: 0000000000000000 RBX: ffffffff8010f510 RCX: 0000000000000018
* RDX: 0000010001e37280 RSI: ffffffff803ac0a0 RDI: 000001007f43c400
* RBP: 0000000000000000 R08: ffffffff8048a000 R09: 0000000000000000
* R10: ffffffff80482188 R11: 0000000000000001 R12: 0000000000000000
* R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
* FS: 0000002a96e14fc0(0000) GS:ffffffff80481d80(0000) GS:0000000055578aa0
* CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
* CR2: 0000002a9556b000 CR3: 0000000000101000 CR4: 00000000000006e0
*
*/
long
x86_64_exception_frame(ulong flags, ulong kvaddr, char *local,
struct bt_info *bt, FILE *ofp)
{
long rip, rsp, cs, ss, rflags, orig_rax, rbp;
long rax, rbx, rcx, rdx, rsi, rdi;
long r8, r9, r10, r11, r12, r13, r14, r15;
struct machine_specific *ms;
struct syment *sp;
ulong offset;
char *pt_regs_buf;
long verified;
long err;
char buf[BUFSIZE];
ms = machdep->machspec;
sp = NULL;
if (!(machdep->flags & PT_REGS_INIT) || (flags == EFRAME_INIT)) {
err = 0;
err |= ((ms->pto.r15 = MEMBER_OFFSET("pt_regs", "r15")) ==
INVALID_OFFSET);
err |= ((ms->pto.r14 = MEMBER_OFFSET("pt_regs", "r14")) ==
INVALID_OFFSET);
err |= ((ms->pto.r13 = MEMBER_OFFSET("pt_regs", "r13")) ==
INVALID_OFFSET);
err |= ((ms->pto.r12 = MEMBER_OFFSET("pt_regs", "r12")) ==
INVALID_OFFSET);
err |= ((ms->pto.r11 = MEMBER_OFFSET("pt_regs", "r11")) ==
INVALID_OFFSET);
err |= ((ms->pto.r10 = MEMBER_OFFSET("pt_regs", "r10")) ==
INVALID_OFFSET);
err |= ((ms->pto.r9 = MEMBER_OFFSET("pt_regs", "r9")) ==
INVALID_OFFSET);
err |= ((ms->pto.r8 = MEMBER_OFFSET("pt_regs", "r8")) ==
INVALID_OFFSET);
err |= ((ms->pto.cs = MEMBER_OFFSET("pt_regs", "cs")) ==
INVALID_OFFSET);
err |= ((ms->pto.ss = MEMBER_OFFSET("pt_regs", "ss")) ==
INVALID_OFFSET);
/*
* x86/x86_64 merge changed traditional register names.
*/
if (((ms->pto.rbp = MEMBER_OFFSET("pt_regs", "rbp")) ==
INVALID_OFFSET) &&
((ms->pto.rbp = MEMBER_OFFSET("pt_regs", "bp")) ==
INVALID_OFFSET))
err++;
if (((ms->pto.rax = MEMBER_OFFSET("pt_regs", "rax")) ==
INVALID_OFFSET) &&
((ms->pto.rax = MEMBER_OFFSET("pt_regs", "ax")) ==
INVALID_OFFSET))
err++;
if (((ms->pto.rbx = MEMBER_OFFSET("pt_regs", "rbx")) ==
INVALID_OFFSET) &&
((ms->pto.rbx = MEMBER_OFFSET("pt_regs", "bx")) ==
INVALID_OFFSET))
err++;
if (((ms->pto.rcx = MEMBER_OFFSET("pt_regs", "rcx")) ==
INVALID_OFFSET) &&
((ms->pto.rcx = MEMBER_OFFSET("pt_regs", "cx")) ==
INVALID_OFFSET))
err++;
if (((ms->pto.rdx = MEMBER_OFFSET("pt_regs", "rdx")) ==
INVALID_OFFSET) &&
((ms->pto.rdx = MEMBER_OFFSET("pt_regs", "dx")) ==
INVALID_OFFSET))
err++;
if (((ms->pto.rsi = MEMBER_OFFSET("pt_regs", "rsi")) ==
INVALID_OFFSET) &&
((ms->pto.rsi = MEMBER_OFFSET("pt_regs", "si")) ==
INVALID_OFFSET))
err++;
if (((ms->pto.rdi = MEMBER_OFFSET("pt_regs", "rdi")) ==
INVALID_OFFSET) &&
((ms->pto.rdi = MEMBER_OFFSET("pt_regs", "di")) ==
INVALID_OFFSET))
err++;
if (((ms->pto.rip = MEMBER_OFFSET("pt_regs", "rip")) ==
INVALID_OFFSET) &&
((ms->pto.rip = MEMBER_OFFSET("pt_regs", "ip")) ==
INVALID_OFFSET))
err++;
if (((ms->pto.rsp = MEMBER_OFFSET("pt_regs", "rsp")) ==
INVALID_OFFSET) &&
((ms->pto.rsp = MEMBER_OFFSET("pt_regs", "sp")) ==
INVALID_OFFSET))
err++;
if (((ms->pto.eflags = MEMBER_OFFSET("pt_regs", "eflags")) ==
INVALID_OFFSET) &&
((ms->pto.eflags = MEMBER_OFFSET("pt_regs", "flags")) ==
INVALID_OFFSET))
err++;
if (((ms->pto.orig_rax = MEMBER_OFFSET("pt_regs", "orig_rax")) ==
INVALID_OFFSET) &&
((ms->pto.orig_rax = MEMBER_OFFSET("pt_regs", "orig_ax")) ==
INVALID_OFFSET))
err++;
if (err)
error(WARNING, "pt_regs structure has changed\n");
machdep->flags |= PT_REGS_INIT;
if (flags == EFRAME_INIT)
return err;
}
if (kvaddr) {
pt_regs_buf = GETBUF(SIZE(pt_regs));
readmem(kvaddr, KVADDR, pt_regs_buf,
SIZE(pt_regs), "pt_regs", FAULT_ON_ERROR);
} else
pt_regs_buf = local;
rip = ULONG(pt_regs_buf + ms->pto.rip);
rsp = ULONG(pt_regs_buf + ms->pto.rsp);
cs = ULONG(pt_regs_buf + ms->pto.cs);
ss = ULONG(pt_regs_buf + ms->pto.ss);
rflags = ULONG(pt_regs_buf + ms->pto.eflags);
orig_rax = ULONG(pt_regs_buf + ms->pto.orig_rax);
rbp = ULONG(pt_regs_buf + ms->pto.rbp);
rax = ULONG(pt_regs_buf + ms->pto.rax);
rbx = ULONG(pt_regs_buf + ms->pto.rbx);
rcx = ULONG(pt_regs_buf + ms->pto.rcx);
rdx = ULONG(pt_regs_buf + ms->pto.rdx);
rsi = ULONG(pt_regs_buf + ms->pto.rsi);
rdi = ULONG(pt_regs_buf + ms->pto.rdi);
r8 = ULONG(pt_regs_buf + ms->pto.r8);
r9 = ULONG(pt_regs_buf + ms->pto.r9);
r10 = ULONG(pt_regs_buf + ms->pto.r10);
r11 = ULONG(pt_regs_buf + ms->pto.r11);
r12 = ULONG(pt_regs_buf + ms->pto.r12);
r13 = ULONG(pt_regs_buf + ms->pto.r13);
r14 = ULONG(pt_regs_buf + ms->pto.r14);
r15 = ULONG(pt_regs_buf + ms->pto.r15);
verified = x86_64_eframe_verify(bt,
kvaddr ? kvaddr : (local - bt->stackbuf) + bt->stackbase,
cs, ss, rip, rsp, rflags);
/*
* If it's print-if-verified request, don't print bogus eframes.
*/
if (!verified && ((flags & (EFRAME_VERIFY|EFRAME_PRINT)) ==
(EFRAME_VERIFY|EFRAME_PRINT)))
flags &= ~EFRAME_PRINT;
else if (CRASHDEBUG(1) && verified && (flags != EFRAME_VERIFY))
fprintf(ofp, "< exception frame at: %lx >\n", kvaddr ?
kvaddr : (local - bt->stackbuf) + bt->stackbase);
if (flags & EFRAME_PRINT) {
if (flags & EFRAME_SEARCH) {
fprintf(ofp, "\n %s-MODE EXCEPTION FRAME AT: %lx\n",
cs & 3 ? "USER" : "KERNEL",
kvaddr ? kvaddr :
(local - bt->stackbuf) + bt->stackbase);
if (!(cs & 3)) {
fprintf(ofp, " [exception RIP: ");
if ((sp = value_search(rip, &offset))) {
fprintf(ofp, "%s", sp->name);
if (offset)
fprintf(ofp,
(*gdb_output_radix == 16) ?
"+0x%lx" : "+%ld",
offset);
} else
fprintf(ofp,
"unknown or invalid address");
fprintf(ofp, "]\n");
}
} else if (!(cs & 3)) {
fprintf(ofp, " [exception RIP: ");
if ((sp = value_search(rip, &offset))) {
fprintf(ofp, "%s", sp->name);
if (offset)
fprintf(ofp, (*gdb_output_radix == 16) ?
"+0x%lx" : "+%ld", offset);
bt->eframe_ip = rip;
} else
fprintf(ofp, "unknown or invalid address");
fprintf(ofp, "]\n");
}
fprintf(ofp, " RIP: %016lx RSP: %016lx RFLAGS: %08lx\n",
rip, rsp, rflags);
fprintf(ofp, " RAX: %016lx RBX: %016lx RCX: %016lx\n",
rax, rbx, rcx);
fprintf(ofp, " RDX: %016lx RSI: %016lx RDI: %016lx\n",
rdx, rsi, rdi);
fprintf(ofp, " RBP: %016lx R8: %016lx R9: %016lx\n",
rbp, r8, r9);
fprintf(ofp, " R10: %016lx R11: %016lx R12: %016lx\n",
r10, r11, r12);
fprintf(ofp, " R13: %016lx R14: %016lx R15: %016lx\n",
r13, r14, r15);
fprintf(ofp, " ORIG_RAX: %016lx CS: %04lx SS: %04lx\n",
orig_rax, cs, ss);
if (!(cs & 3) && sp && (bt->flags & BT_LINE_NUMBERS)) {
get_line_number(rip, buf, FALSE);
if (strlen(buf))
fprintf(ofp, " %s\n", buf);
}
if (!verified && CRASHDEBUG((pc->flags & RUNTIME) ? 0 : 1))
error(WARNING, "possibly bogus exception frame\n");
}
if ((flags & EFRAME_PRINT) && BT_REFERENCE_CHECK(bt)) {
x86_64_do_bt_reference_check(bt, rip, NULL);
x86_64_do_bt_reference_check(bt, rsp, NULL);
x86_64_do_bt_reference_check(bt, cs, NULL);
x86_64_do_bt_reference_check(bt, ss, NULL);
x86_64_do_bt_reference_check(bt, rflags, NULL);
x86_64_do_bt_reference_check(bt, orig_rax, NULL);
x86_64_do_bt_reference_check(bt, rbp, NULL);
x86_64_do_bt_reference_check(bt, rax, NULL);
x86_64_do_bt_reference_check(bt, rbx, NULL);
x86_64_do_bt_reference_check(bt, rcx, NULL);
x86_64_do_bt_reference_check(bt, rdx, NULL);
x86_64_do_bt_reference_check(bt, rsi, NULL);
x86_64_do_bt_reference_check(bt, rdi, NULL);
x86_64_do_bt_reference_check(bt, r8, NULL);
x86_64_do_bt_reference_check(bt, r9, NULL);
x86_64_do_bt_reference_check(bt, r10, NULL);
x86_64_do_bt_reference_check(bt, r11, NULL);
x86_64_do_bt_reference_check(bt, r12, NULL);
x86_64_do_bt_reference_check(bt, r13, NULL);
x86_64_do_bt_reference_check(bt, r14, NULL);
x86_64_do_bt_reference_check(bt, r15, NULL);
}
/* Remember the rip and rsp for unwinding the process stack */
if (kt->flags & DWARF_UNWIND){
bt->instptr = rip;
bt->stkptr = rsp;
bt->bptr = rbp;
}
if (kvaddr)
FREEBUF(pt_regs_buf);
if (flags & EFRAME_CS)
return cs;
else if (flags & EFRAME_VERIFY)
return verified;
return 0;
}
static int
x86_64_print_eframe_location(ulong eframe, int level, FILE *ofp)
{
return FALSE;
#ifdef NOTDEF
ulong rip;
char *pt_regs_buf;
struct machine_specific *ms;
struct syment *sp;
ms = machdep->machspec;
pt_regs_buf = GETBUF(SIZE(pt_regs));
if (!readmem(eframe, KVADDR, pt_regs_buf, SIZE(pt_regs),
"pt_regs", RETURN_ON_ERROR|QUIET)) {
FREEBUF(pt_regs_buf);
return FALSE;
}
rip = ULONG(pt_regs_buf + ms->pto.rip);
FREEBUF(pt_regs_buf);
if (!(sp = value_search(rip, NULL)))
return FALSE;
fprintf(ofp, "%s#%d [%8lx] %s at %lx\n", level < 10 ? " " : "", level+1,
eframe, sp->name, rip);
return TRUE;
#endif
}
/*
* Check whether an RIP is in the FIXMAP vsyscall page.
*/
static int
is_vsyscall_addr(ulong rip)
{
ulong page;
if ((page = machdep->machspec->vsyscall_page))
if ((rip >= page) && (rip < (page+PAGESIZE())))
return TRUE;
return FALSE;
}
struct syment *
x86_64_value_to_symbol(ulong vaddr, ulong *offset)
{
struct syment *sp;
if (is_vsyscall_addr(vaddr) &&
(sp = value_search_base_kernel(vaddr, offset)))
return sp;
return generic_machdep_value_to_symbol(vaddr, offset);
}
/*
* Check that the verifiable registers contain reasonable data.
*/
#define RAZ_MASK 0xffffffffffc08028 /* return-as-zero bits */
static int
x86_64_eframe_verify(struct bt_info *bt, long kvaddr, long cs, long ss,
long rip, long rsp, long rflags)
{
int estack;
struct syment *sp;
ulong offset, exception;
if ((rflags & RAZ_MASK) || !(rflags & 0x2))
return FALSE;
if ((cs == 0x10) && (ss == 0x18)) {
if (is_kernel_text(rip) && IS_KVADDR(rsp))
return TRUE;
if (x86_64_is_module_addr(rip) &&
IS_KVADDR(rsp) &&
(rsp == (kvaddr + SIZE(pt_regs))))
return TRUE;
if (is_kernel_text(rip) &&
(bt->flags & BT_EXCEPTION_STACK) &&
in_user_stack(bt->tc->task, rsp))
return TRUE;
if (is_kernel_text(rip) && !IS_KVADDR(rsp) &&
(bt->flags & BT_EFRAME_SEARCH) &&
x86_64_in_exception_stack(bt, NULL))
return TRUE;
if (is_kernel_text(rip) &&
x86_64_in_exception_stack(bt, &estack) &&
(estack <= 1))
return TRUE;
/*
* RSP may be 0 from MSR_IA32_SYSENTER_ESP.
*/
if (STREQ(closest_symbol(rip), "ia32_sysenter_target"))
return TRUE;
if ((rip == 0) && INSTACK(rsp, bt) &&
STREQ(bt->call_target, "ret_from_fork"))
return TRUE;
if (readmem(kvaddr - 8, KVADDR, &exception, sizeof(ulong),
"exception type", RETURN_ON_ERROR|QUIET) &&
(sp = value_search(exception, &offset)) &&
STREQ(sp->name, "page_fault"))
return TRUE;
}
if ((cs == 0x10) && kvaddr) {
if (is_kernel_text(rip) && IS_KVADDR(rsp) &&
(rsp == (kvaddr + SIZE(pt_regs) + 8)))
return TRUE;
}
if ((cs == 0x10) && kvaddr) {
if (is_kernel_text(rip) && IS_KVADDR(rsp) &&
(rsp == (kvaddr + SIZE(pt_regs))))
return TRUE;
}
if ((cs == 0x10) && kvaddr) {
if (is_kernel_text(rip) && IS_KVADDR(rsp) &&
x86_64_in_exception_stack(bt, NULL))
return TRUE;
}
if ((cs == 0x33) && (ss == 0x2b)) {
if (IS_UVADDR(rip, bt->tc) && IS_UVADDR(rsp, bt->tc))
return TRUE;
if (is_vsyscall_addr(rip) && IS_UVADDR(rsp, bt->tc))
return TRUE;
}
if (XEN() && ((cs == 0x33) || (cs == 0xe033)) &&
((ss == 0x2b) || (ss == 0xe02b))) {
if (IS_UVADDR(rip, bt->tc) && IS_UVADDR(rsp, bt->tc))
return TRUE;
}
if (XEN() && ((cs == 0x10000e030) || (cs == 0xe030)) &&
(ss == 0xe02b)) {
if (is_kernel_text(rip) && IS_KVADDR(rsp))
return TRUE;
}
/*
* 32-bit segments
*/
if ((cs == 0x23) && (ss == 0x2b)) {
if (IS_UVADDR(rip, bt->tc) && IS_UVADDR(rsp, bt->tc))
return TRUE;
}
return FALSE;
}
/*
* Get a stack frame combination of pc and ra from the most relevent spot.
*/
static void
x86_64_get_stack_frame(struct bt_info *bt, ulong *pcp, ulong *spp)
{
if (bt->flags & BT_DUMPFILE_SEARCH)
return x86_64_get_dumpfile_stack_frame(bt, pcp, spp);
if (pcp)
*pcp = x86_64_get_pc(bt);
if (spp)
*spp = x86_64_get_sp(bt);
}
/*
* Get the starting point for the active cpus in a diskdump/netdump.
*/
static void
x86_64_get_dumpfile_stack_frame(struct bt_info *bt_in, ulong *rip, ulong *rsp)
{
int panic_task;
int i, j, estack, panic, stage, in_nmi_stack;
char *sym;
struct syment *sp;
ulong *up, *up2;
struct bt_info bt_local, *bt;
struct machine_specific *ms;
char *user_regs;
ulong ur_rip, ur_rsp;
ulong halt_rip, halt_rsp;
ulong crash_kexec_rip, crash_kexec_rsp;
ulong call_function_rip, call_function_rsp;
ulong sysrq_c_rip, sysrq_c_rsp;
ulong notify_die_rip, notify_die_rsp;
#define STACKTOP_INDEX(BT) (((BT)->stacktop - (BT)->stackbase)/sizeof(ulong))
bt = &bt_local;
BCOPY(bt_in, bt, sizeof(struct bt_info));
ms = machdep->machspec;
ur_rip = ur_rsp = 0;
halt_rip = halt_rsp = 0;
crash_kexec_rip = crash_kexec_rsp = 0;
call_function_rip = call_function_rsp = 0;
notify_die_rsp = notify_die_rip = 0;
sysrq_c_rip = sysrq_c_rsp = 0;
in_nmi_stack = stage = 0;
estack = -1;
panic = FALSE;
panic_task = tt->panic_task == bt->task ? TRUE : FALSE;
if (panic_task && bt->machdep) {
user_regs = bt->machdep;
if (x86_64_eframe_verify(bt,
0,
ULONG(user_regs + OFFSET(user_regs_struct_cs)),
ULONG(user_regs + OFFSET(user_regs_struct_ss)),
ULONG(user_regs + OFFSET(user_regs_struct_rip)),
ULONG(user_regs + OFFSET(user_regs_struct_rsp)),
ULONG(user_regs + OFFSET(user_regs_struct_eflags)))) {
bt->stkptr = ULONG(user_regs +
OFFSET(user_regs_struct_rsp));
if (x86_64_in_irqstack(bt)) {
ur_rip = ULONG(user_regs +
OFFSET(user_regs_struct_rip));
ur_rsp = ULONG(user_regs +
OFFSET(user_regs_struct_rsp));
goto skip_stage;
}
}
} else if (ELF_NOTES_VALID() && bt->machdep) {
user_regs = bt->machdep;
ur_rip = ULONG(user_regs +
OFFSET(user_regs_struct_rip));
ur_rsp = ULONG(user_regs +
OFFSET(user_regs_struct_rsp));
}
/*
* Check the process stack first.
*/
next_stack:
for (i = 0, up = (ulong *)bt->stackbuf; i < STACKTOP_INDEX(bt); i++, up++) {
sym = closest_symbol(*up);
if (XEN_CORE_DUMPFILE()) {
if (STREQ(sym, "crash_kexec")) {
sp = x86_64_function_called_by((*up)-5);
if (sp && STREQ(sp->name, "machine_kexec")) {
*rip = *up;
*rsp = bt->stackbase + ((char *)(up) - bt->stackbuf);
return;
}
}
if (STREQ(sym, "xen_machine_kexec")) {
*rip = *up;
*rsp = bt->stackbase + ((char *)(up) - bt->stackbuf);
return;
}
} else if (STREQ(sym, "netconsole_netdump") ||
STREQ(sym, "netpoll_start_netdump") ||
STREQ(sym, "start_disk_dump") ||
STREQ(sym, "disk_dump") ||
STREQ(sym, "crash_kexec") ||
STREQ(sym, "machine_kexec") ||
STREQ(sym, "try_crashdump")) {
if (STREQ(sym, "crash_kexec")) {
sp = x86_64_function_called_by((*up)-5);
if (sp && STREQ(sp->name, "machine_kexec")) {
*rip = *up;
*rsp = bt->stackbase + ((char *)(up) - bt->stackbuf);
return;
}
}
/*
* Use second instance of crash_kexec if it exists.
*/
if (!(bt->flags & BT_TEXT_SYMBOLS) &&
STREQ(sym, "crash_kexec") && !crash_kexec_rip) {
crash_kexec_rip = *up;
crash_kexec_rsp = bt->stackbase + ((char *)(up) - bt->stackbuf);
continue;
}
*rip = *up;
*rsp = bt->stackbase + ((char *)(up) - bt->stackbuf);
return;
}
if ((estack >= 0) &&
(STREQ(sym, "nmi_watchdog_tick") ||
STREQ(sym, "default_do_nmi"))) {
sp = x86_64_function_called_by((*up)-5);
if (!sp || !STREQ(sp->name, "die_nmi"))
continue;
*rip = *up;
*rsp = bt->stackbase + ((char *)(up) - bt->stackbuf);
bt_in->flags |= BT_START;
*rip = symbol_value("die_nmi");
*rsp = (*rsp) - (7*sizeof(ulong));
return;
}
if (STREQ(sym, "panic")) {
*rip = *up;
*rsp = bt->stackbase + ((char *)(up) - bt->stackbuf);
panic = TRUE;
continue; /* keep looking for die */
}
if (STREQ(sym, "die")) {
*rip = *up;
*rsp = bt->stackbase + ((char *)(up) - bt->stackbuf);
j = i;
up2 = up;
for (j++, up2++; j < STACKTOP_INDEX(bt); j++, up2++) {
sym = closest_symbol(*up2);
if (STREQ(sym, "sysrq_handle_crash"))
goto next_sysrq;
}
return;
}
if (STREQ(sym, "sysrq_handle_crash")) {
j = i;
up2 = up;
next_sysrq:
sysrq_c_rip = *up2;
sysrq_c_rsp = bt->stackbase + ((char *)(up2) - bt->stackbuf);
pc->flags |= SYSRQ;
for (j++, up2++; j < STACKTOP_INDEX(bt); j++, up2++) {
sym = closest_symbol(*up2);
if (STREQ(sym, "sysrq_handle_crash"))
goto next_sysrq;
}
}
if (!panic_task && (stage > 0) &&
(STREQ(sym, "smp_call_function_interrupt") ||
STREQ(sym, "stop_this_cpu"))) {
call_function_rip = *up;
call_function_rsp = bt->stackbase +
((char *)(up) - bt->stackbuf);
}
if (!panic_task && STREQ(sym, "crash_nmi_callback")) {
*rip = *up;
*rsp = bt->stackbase + ((char *)(up) - bt->stackbuf);
return;
}
if (!panic_task && in_nmi_stack &&
(pc->flags2 & VMCOREINFO) && STREQ(sym, "notify_die")) {
notify_die_rip = *up;
notify_die_rsp = bt->stackbase + ((char *)(up) - bt->stackbuf);
}
if (XEN_CORE_DUMPFILE() && !panic_task && (bt->tc->pid == 0) &&
(stage == 0) && STREQ(sym, "safe_halt")) {
halt_rip = *up;
halt_rsp = bt->stackbase + ((char *)(up) - bt->stackbuf);
}
if (XEN_CORE_DUMPFILE() && !panic_task && (bt->tc->pid == 0) &&
!halt_rip && (stage == 0) && STREQ(sym, "xen_idle")) {
halt_rip = *up;
halt_rsp = bt->stackbase + ((char *)(up) - bt->stackbuf);
}
if (!XEN_CORE_DUMPFILE() && !panic_task && (bt->tc->pid == 0) &&
!halt_rip && (stage == 0) && STREQ(sym, "cpu_idle")) {
halt_rip = *up;
halt_rsp = bt->stackbase + ((char *)(up) - bt->stackbuf);
}
}
if (panic)
return;
if (crash_kexec_rip) {
*rip = crash_kexec_rip;
*rsp = crash_kexec_rsp;
return;
}
skip_stage:
switch (stage)
{
/*
* Now check the processor's interrupt stack.
*/
case 0:
bt->stackbase = ms->stkinfo.ibase[bt->tc->processor];
bt->stacktop = ms->stkinfo.ibase[bt->tc->processor] +
ms->stkinfo.isize;
console("x86_64_get_dumpfile_stack_frame: searching IRQ stack at %lx\n",
bt->stackbase);
bt->stackbuf = ms->irqstack;
alter_stackbuf(bt);
stage = 1;
goto next_stack;
/*
* Check the exception stacks.
*/
case 1:
if (++estack == MAX_EXCEPTION_STACKS)
break;
bt->stackbase = ms->stkinfo.ebase[bt->tc->processor][estack];
bt->stacktop = ms->stkinfo.ebase[bt->tc->processor][estack] +
ms->stkinfo.esize[estack];
console("x86_64_get_dumpfile_stack_frame: searching %s estack at %lx\n",
ms->stkinfo.exception_stacks[estack], bt->stackbase);
if (!(bt->stackbase))
goto skip_stage;
bt->stackbuf = ms->irqstack;
alter_stackbuf(bt);
in_nmi_stack = STREQ(ms->stkinfo.exception_stacks[estack], "NMI");
goto next_stack;
}
if (sysrq_c_rip) {
*rip = sysrq_c_rip;
*rsp = sysrq_c_rsp;
return;
}
if (notify_die_rip) {
*rip = notify_die_rip;
*rsp = notify_die_rsp;
return;
}
/*
* We didn't find what we were looking for, so just use what was
* passed in from the ELF header.
*/
if (ur_rip && ur_rsp) {
*rip = ur_rip;
*rsp = ur_rsp;
if (is_kernel_text(ur_rip) &&
(INSTACK(ur_rsp, bt_in) ||
in_alternate_stack(bt->tc->processor, ur_rsp)))
bt_in->flags |= BT_KERNEL_SPACE;
if (!is_kernel_text(ur_rip) && in_user_stack(bt->tc->task, ur_rsp))
bt_in->flags |= BT_USER_SPACE;
return;
}
if (call_function_rip && call_function_rsp) {
*rip = call_function_rip;
*rsp = call_function_rsp;
return;
}
if (halt_rip && halt_rsp) {
*rip = halt_rip;
*rsp = halt_rsp;
if (KVMDUMP_DUMPFILE() || SADUMP_DUMPFILE())
bt_in->flags &= ~(ulonglong)BT_DUMPFILE_SEARCH;
return;
}
/*
* Use what was (already) saved in the panic task's
* registers found in the ELF header.
*/
if (bt->flags & BT_KDUMP_ELF_REGS) {
user_regs = bt->machdep;
ur_rip = ULONG(user_regs + OFFSET(user_regs_struct_rip));
ur_rsp = ULONG(user_regs + OFFSET(user_regs_struct_rsp));
if (!in_alternate_stack(bt->tc->processor, ur_rsp) &&
!stkptr_to_task(ur_rsp)) {
if (CRASHDEBUG(1))
error(INFO,
"x86_64_get_dumpfile_stack_frame: "
"ELF mismatch: RSP: %lx task: %lx\n",
ur_rsp, bt->task);
} else {
if (is_kernel_text(ur_rip) && (INSTACK(ur_rsp, bt_in) ||
in_alternate_stack(bt->tc->processor, ur_rsp)))
bt_in->flags |= BT_KERNEL_SPACE;
if (!is_kernel_text(ur_rip) && in_user_stack(bt->tc->task, ur_rsp))
bt_in->flags |= BT_USER_SPACE;
return;
}
}
if (CRASHDEBUG(1))
error(INFO,
"x86_64_get_dumpfile_stack_frame: cannot find anything useful (task: %lx)\n",
bt->task);
if (XEN_CORE_DUMPFILE() && !panic_task && is_task_active(bt->task) &&
!(bt->flags & (BT_TEXT_SYMBOLS_ALL|BT_TEXT_SYMBOLS)))
error(FATAL,
"starting backtrace locations of the active (non-crashing) "
"xen tasks\n cannot be determined: try -t or -T options\n");
bt->flags &= ~(ulonglong)BT_DUMPFILE_SEARCH;
machdep->get_stack_frame(bt, rip, rsp);
if (KVMDUMP_DUMPFILE() || SADUMP_DUMPFILE())
bt_in->flags &= ~(ulonglong)BT_DUMPFILE_SEARCH;
}
/*
* Get the saved RSP from the task's thread_struct.
*/
static ulong
x86_64_get_sp(struct bt_info *bt)
{
ulong offset, rsp;
if (tt->flags & THREAD_INFO) {
readmem(bt->task + OFFSET(task_struct_thread) +
OFFSET(thread_struct_rsp), KVADDR,
&rsp, sizeof(void *),
"thread_struct rsp", FAULT_ON_ERROR);
return rsp;
}
offset = OFFSET(task_struct_thread) + OFFSET(thread_struct_rsp);
return GET_STACK_ULONG(offset);
}
/*
* Get the saved PC from the task's thread_struct if it exists;
* otherwise just use the pre-determined thread_return value.
*/
static ulong
x86_64_get_pc(struct bt_info *bt)
{
ulong offset, rip;
if (INVALID_MEMBER(thread_struct_rip))
return machdep->machspec->thread_return;
if (tt->flags & THREAD_INFO) {
readmem(bt->task + OFFSET(task_struct_thread) +
OFFSET(thread_struct_rip), KVADDR,
&rip, sizeof(void *),
"thread_struct rip", FAULT_ON_ERROR);
if (rip)
return rip;
else
return machdep->machspec->thread_return;
}
offset = OFFSET(task_struct_thread) + OFFSET(thread_struct_rip);
return GET_STACK_ULONG(offset);
}
/*
* Do the work for x86_64_get_sp() and x86_64_get_pc().
*/
static void
get_x86_64_frame(struct bt_info *bt, ulong *getpc, ulong *getsp)
{
error(FATAL, "get_x86_64_frame: TBD\n");
}
/*
* Do the work for cmd_irq().
*/
static void
x86_64_dump_irq(int irq)
{
if (symbol_exists("irq_desc") ||
kernel_symbol_exists("irq_desc_ptrs") ||
kernel_symbol_exists("irq_desc_tree")) {
machdep->dump_irq = generic_dump_irq;
return(generic_dump_irq(irq));
}
error(FATAL,
"x86_64_dump_irq: irq_desc[] or irq_desc_tree do not exist?\n");
}
static void
x86_64_get_irq_affinity(int irq)
{
if (symbol_exists("irq_desc") ||
kernel_symbol_exists("irq_desc_ptrs") ||
kernel_symbol_exists("irq_desc_tree")) {
machdep->get_irq_affinity = generic_get_irq_affinity;
return(generic_get_irq_affinity(irq));
}
error(FATAL,
"x86_64_get_irq_affinity: irq_desc[] or irq_desc_tree do not exist?\n");
}
static void
x86_64_show_interrupts(int irq, ulong *cpus)
{
if (symbol_exists("irq_desc") ||
kernel_symbol_exists("irq_desc_ptrs") ||
kernel_symbol_exists("irq_desc_tree")) {
machdep->show_interrupts = generic_show_interrupts;
return(generic_show_interrupts(irq, cpus));
}
error(FATAL,
"x86_64_show_interrupts: irq_desc[] or irq_desc_tree do not exist?\n");
}
/*
* Do the work for irq -d
*/
void
x86_64_display_idt_table(void)
{
int i;
char *idt_table_buf;
char buf[BUFSIZE];
ulong *ip;
if (INVALID_SIZE(gate_struct)) {
option_not_supported('d');
return;
}
idt_table_buf = GETBUF(SIZE(gate_struct) * 256);
readmem(symbol_value("idt_table"), KVADDR, idt_table_buf,
SIZE(gate_struct) * 256, "idt_table", FAULT_ON_ERROR);
ip = (ulong *)idt_table_buf;
for (i = 0; i < 256; i++, ip += 2) {
if (i < 10)
fprintf(fp, " ");
else if (i < 100)
fprintf(fp, " ");
fprintf(fp, "[%d] %s\n",
i, x86_64_extract_idt_function(ip, buf, NULL));
}
FREEBUF(idt_table_buf);
}
static void
x86_64_exception_stacks_init(void)
{
char *idt_table_buf;
char buf[BUFSIZE];
int i;
ulong *ip, ist;
long size;
struct machine_specific *ms;
ms = machdep->machspec;
ms->stkinfo.NMI_stack_index = -1;
for (i = 0; i < MAX_EXCEPTION_STACKS; i++)
ms->stkinfo.exception_stacks[i] = "(unknown)";
if (!kernel_symbol_exists("idt_table"))
return;
if (INVALID_SIZE(gate_struct))
size = 16;
else
size = SIZE(gate_struct);
idt_table_buf = GETBUF(size * 256);
readmem(symbol_value("idt_table"), KVADDR, idt_table_buf,
size * 256, "idt_table", FAULT_ON_ERROR);
ip = (ulong *)idt_table_buf;
if (CRASHDEBUG(1))
fprintf(fp, "exception IST:\n");
for (i = 0; i < 256; i++, ip += 2) {
ist = ((*ip) >> 32) & 0x7;
if (ist) {
x86_64_extract_idt_function(ip, buf, NULL);
if (CRASHDEBUG(1))
fprintf(fp, " %ld: %s\n", ist, buf);
if (strstr(buf, "nmi")) {
ms->stkinfo.NMI_stack_index = ist-1;
ms->stkinfo.exception_stacks[ist-1] = "NMI";
}
if (strstr(buf, "debug"))
ms->stkinfo.exception_stacks[ist-1] = "DEBUG";
if (strstr(buf, "stack"))
ms->stkinfo.exception_stacks[ist-1] = "STACKFAULT";
if (strstr(buf, "double"))
ms->stkinfo.exception_stacks[ist-1] = "DOUBLEFAULT";
if (strstr(buf, "machine"))
ms->stkinfo.exception_stacks[ist-1] = "MCE";
}
}
if (CRASHDEBUG(1)) {
fprintf(fp, "exception stacks:\n");
for (i = 0; i < MAX_EXCEPTION_STACKS; i++)
fprintf(fp, " [%d]: %s\n", i, ms->stkinfo.exception_stacks[i]);
}
FREEBUF(idt_table_buf);
}
/*
* Extract the function name out of the IDT entry.
*/
static char *
x86_64_extract_idt_function(ulong *ip, char *buf, ulong *retaddr)
{
ulong i1, i2, addr;
char locbuf[BUFSIZE];
physaddr_t phys;
if (buf)
BZERO(buf, BUFSIZE);
i1 = *ip;
i2 = *(ip+1);
i2 <<= 32;
addr = i2 & 0xffffffff00000000;
addr |= (i1 & 0xffff);
i1 >>= 32;
addr |= (i1 & 0xffff0000);
if (retaddr)
*retaddr = addr;
if (!buf)
return NULL;
value_to_symstr(addr, locbuf, 0);
if (strlen(locbuf))
sprintf(buf, "%s", locbuf);
else {
sprintf(buf, "%016lx", addr);
if (kvtop(NULL, addr, &phys, 0)) {
addr = machdep->kvbase + (ulong)phys;
if (value_to_symstr(addr, locbuf, 0)) {
strcat(buf, " <");
strcat(buf, locbuf);
strcat(buf, ">");
}
}
}
return buf;
}
/*
* Filter disassembly output if the output radix is not gdb's default 10
*/
static int
x86_64_dis_filter(ulong vaddr, char *inbuf, unsigned int output_radix)
{
char buf1[BUFSIZE];
char buf2[BUFSIZE];
char *colon, *p1;
int argc;
char *argv[MAXARGS];
ulong value;
if (!inbuf)
return TRUE;
/*
* For some reason gdb can go off into the weeds translating text addresses,
* (on alpha -- not necessarily seen on x86_64) so this routine both fixes the
* references as well as imposing the current output radix on the translations.
*/
console(" IN: %s", inbuf);
colon = strstr(inbuf, ":");
if (colon) {
sprintf(buf1, "0x%lx <%s>", vaddr,
value_to_symstr(vaddr, buf2, output_radix));
sprintf(buf2, "%s%s", buf1, colon);
strcpy(inbuf, buf2);
}
strcpy(buf1, inbuf);
argc = parse_line(buf1, argv);
if ((FIRSTCHAR(argv[argc-1]) == '<') &&
(LASTCHAR(argv[argc-1]) == '>')) {
p1 = rindex(inbuf, '<');
while ((p1 > inbuf) && !STRNEQ(p1, " 0x"))
p1--;
if (!STRNEQ(p1, " 0x"))
return FALSE;
p1++;
if (!extract_hex(p1, &value, NULLCHAR, TRUE))
return FALSE;
sprintf(buf1, "0x%lx <%s>\n", value,
value_to_symstr(value, buf2, output_radix));
sprintf(p1, "%s", buf1);
} else if (STREQ(argv[argc-2], "callq") &&
hexadecimal(argv[argc-1], 0)) {
/*
* Update module code of the form:
*
* callq 0xffffffffa0017aa0
*
* to show a bracketed direct call target.
*/
p1 = &LASTCHAR(inbuf);
if (extract_hex(argv[argc-1], &value, NULLCHAR, TRUE)) {
sprintf(buf1, " <%s>\n",
value_to_symstr(value, buf2, output_radix));
if (IS_MODULE_VADDR(value) &&
!strstr(buf2, "+"))
sprintf(p1, "%s", buf1);
}
}
if (value_symbol(vaddr) &&
(strstr(inbuf, "nopl 0x0(%rax,%rax,1)") ||
strstr(inbuf, "data32 data32 data32 xchg %ax,%ax"))) {
strip_line_end(inbuf);
strcat(inbuf, " [FTRACE NOP]\n");
}
console("OUT: %s", inbuf);
return TRUE;
}
/*
* Override smp_num_cpus if possible and necessary.
*/
int
x86_64_get_smp_cpus(void)
{
int i, cpus, nr_pda, cpunumber, _cpu_pda, _boot_cpu_pda;
char *cpu_pda_buf;
ulong level4_pgt, cpu_pda_addr;
struct syment *sp;
if (!VALID_STRUCT(x8664_pda)) {
if (!(sp = per_cpu_symbol_search("per_cpu__cpu_number")) ||
!(kt->flags & PER_CPU_OFF))
return 1;
for (i = cpus = 0; i < NR_CPUS; i++) {
if (kt->__per_cpu_offset[i] == 0)
break;
if (!readmem(sp->value + kt->__per_cpu_offset[i],
KVADDR, &cpunumber, sizeof(int),
"cpu number (per_cpu)", QUIET|RETURN_ON_ERROR))
break;
if (cpunumber != cpus)
break;
cpus++;
}
if ((i = get_cpus_present()) && (!cpus || (i < cpus)))
cpus = get_highest_cpu_present() + 1;
return cpus;
}
_boot_cpu_pda = FALSE;
cpu_pda_buf = GETBUF(SIZE(x8664_pda));
if (LKCD_KERNTYPES()) {
if (symbol_exists("_cpu_pda"))
_cpu_pda = TRUE;
else
_cpu_pda = FALSE;
nr_pda = get_cpus_possible();
} else {
if (symbol_exists("_cpu_pda")) {
if (!(nr_pda = get_array_length("_cpu_pda", NULL, 0)))
nr_pda = NR_CPUS;
_cpu_pda = TRUE;
} else {
if (!(nr_pda = get_array_length("cpu_pda", NULL, 0)))
nr_pda = NR_CPUS;
_cpu_pda = FALSE;
}
}
if (_cpu_pda) {
if (symbol_exists("_boot_cpu_pda"))
_boot_cpu_pda = TRUE;
else
_boot_cpu_pda = FALSE;
}
for (i = cpus = 0; i < nr_pda; i++) {
if (_cpu_pda) {
if (_boot_cpu_pda) {
if (!_CPU_PDA_READ2(i, cpu_pda_buf))
break;
} else {
if (!_CPU_PDA_READ(i, cpu_pda_buf))
break;
}
} else {
if (!CPU_PDA_READ(i, cpu_pda_buf))
break;
}
if (VALID_MEMBER(x8664_pda_level4_pgt)) {
level4_pgt = ULONG(cpu_pda_buf + OFFSET(x8664_pda_level4_pgt));
if (!VALID_LEVEL4_PGT_ADDR(level4_pgt))
break;
}
cpunumber = INT(cpu_pda_buf + OFFSET(x8664_pda_cpunumber));
if (cpunumber != cpus)
break;
cpus++;
}
FREEBUF(cpu_pda_buf);
return cpus;
}
/*
* Machine dependent command.
*/
void
x86_64_cmd_mach(void)
{
int c, cflag, mflag;
unsigned int radix;
cflag = mflag = radix = 0;
while ((c = getopt(argcnt, args, "cmxd")) != EOF) {
switch(c)
{
case 'c':
cflag++;
break;
case 'm':
mflag++;
x86_64_display_memmap();
break;
case 'x':
if (radix == 10)
error(FATAL,
"-d and -x are mutually exclusive\n");
radix = 16;
break;
case 'd':
if (radix == 16)
error(FATAL,
"-d and -x are mutually exclusive\n");
radix = 10;
break;
default:
argerrs++;
break;
}
}
if (argerrs)
cmd_usage(pc->curcmd, SYNOPSIS);
if (cflag)
x86_64_display_cpu_data(radix);
if (!cflag && !mflag)
x86_64_display_machine_stats();
}
/*
* "mach" command output.
*/
static void
x86_64_display_machine_stats(void)
{
int i, c;
struct new_utsname *uts;
char buf[BUFSIZE];
ulong mhz;
uts = &kt->utsname;
fprintf(fp, " MACHINE TYPE: %s\n", uts->machine);
fprintf(fp, " MEMORY SIZE: %s\n", get_memory_size(buf));
fprintf(fp, " CPUS: %d", kt->cpus);
if (kt->cpus - get_cpus_to_display())
fprintf(fp, " [OFFLINE: %d]\n",
kt->cpus - get_cpus_to_display());
else
fprintf(fp, "\n");
if (!STREQ(kt->hypervisor, "(undetermined)") &&
!STREQ(kt->hypervisor, "bare hardware"))
fprintf(fp, " HYPERVISOR: %s\n", kt->hypervisor);
fprintf(fp, " PROCESSOR SPEED: ");
if ((mhz = machdep->processor_speed()))
fprintf(fp, "%ld Mhz\n", mhz);
else
fprintf(fp, "(unknown)\n");
fprintf(fp, " HZ: %d\n", machdep->hz);
fprintf(fp, " PAGE SIZE: %d\n", PAGESIZE());
// fprintf(fp, " L1 CACHE SIZE: %d\n", l1_cache_size());
fprintf(fp, " KERNEL VIRTUAL BASE: %lx\n", machdep->kvbase);
fprintf(fp, " KERNEL VMALLOC BASE: %lx\n", vt->vmalloc_start);
if (machdep->flags & VMEMMAP)
fprintf(fp, " KERNEL VMEMMAP BASE: %lx\n", machdep->machspec->vmemmap_vaddr);
fprintf(fp, " KERNEL START MAP: %lx\n", __START_KERNEL_map);
fprintf(fp, " KERNEL MODULES BASE: %lx\n", MODULES_VADDR);
fprintf(fp, " KERNEL STACK SIZE: %ld\n", STACKSIZE());
fprintf(fp, " IRQ STACK SIZE: %d\n", machdep->machspec->stkinfo.isize);
fprintf(fp, " IRQ STACKS:\n");
for (c = 0; c < kt->cpus; c++) {
sprintf(buf, "CPU %d", c);
fprintf(fp, "%22s: %016lx",
buf, machdep->machspec->stkinfo.ibase[c]);
if (hide_offline_cpu(c))
fprintf(fp, " [OFFLINE]\n");
else
fprintf(fp, "\n");
}
for (i = 0; i < MAX_EXCEPTION_STACKS; i++) {
if (machdep->machspec->stkinfo.ebase[0][i] == 0)
break;
fprintf(fp, "%11s STACK SIZE: %d\n",
machdep->machspec->stkinfo.exception_stacks[i],
machdep->machspec->stkinfo.esize[i]);
sprintf(buf, "%s STACKS:\n", machdep->machspec->stkinfo.exception_stacks[i]);
fprintf(fp, "%24s", buf);
for (c = 0; c < kt->cpus; c++) {
if (machdep->machspec->stkinfo.ebase[c][i] == 0)
break;
sprintf(buf, "CPU %d", c);
fprintf(fp, "%22s: %016lx",
buf, machdep->machspec->stkinfo.ebase[c][i]);
if (hide_offline_cpu(c))
fprintf(fp, " [OFFLINE]\n");
else
fprintf(fp, "\n");
}
}
}
/*
* "mach -c"
*/
static void
x86_64_display_cpu_data(unsigned int radix)
{
int cpu, cpus, boot_cpu, _cpu_pda;
ulong cpu_data;
ulong cpu_pda, cpu_pda_addr;
struct syment *per_cpu;
boot_cpu = _cpu_pda = FALSE;
cpu_data = cpu_pda = 0;
cpus = 0;
per_cpu = NULL;
if (symbol_exists("cpu_data")) {
cpu_data = symbol_value("cpu_data");
cpus = kt->cpus;
boot_cpu = FALSE;
} else if ((per_cpu = per_cpu_symbol_search("per_cpu__cpu_info"))) {
cpus = kt->cpus;
boot_cpu = FALSE;
} else if (symbol_exists("boot_cpu_data")) {
cpu_data = symbol_value("boot_cpu_data");
boot_cpu = TRUE;
cpus = 1;
}
if (symbol_exists("_cpu_pda")) {
cpu_pda = symbol_value("_cpu_pda");
_cpu_pda = TRUE;
} else if (symbol_exists("cpu_pda")) {
cpu_pda = symbol_value("cpu_pda");
_cpu_pda = FALSE;
}
for (cpu = 0; cpu < cpus; cpu++) {
if (boot_cpu)
fprintf(fp, "BOOT CPU:\n");
else {
if (hide_offline_cpu(cpu)) {
fprintf(fp, "%sCPU %d: [OFFLINE]\n", cpu ? "\n" : "", cpu);
continue;
} else
fprintf(fp, "%sCPU %d:\n", cpu ? "\n" : "", cpu);
}
if (per_cpu)
cpu_data = per_cpu->value + kt->__per_cpu_offset[cpu];
dump_struct("cpuinfo_x86", cpu_data, radix);
if (_cpu_pda) {
readmem(cpu_pda, KVADDR, &cpu_pda_addr,
sizeof(unsigned long), "_cpu_pda addr", FAULT_ON_ERROR);
fprintf(fp, "\n");
dump_struct("x8664_pda", cpu_pda_addr, radix);
cpu_pda += sizeof(void *);
} else if (VALID_STRUCT(x8664_pda)) {
fprintf(fp, "\n");
dump_struct("x8664_pda", cpu_pda, radix);
cpu_pda += SIZE(x8664_pda);
}
if (!per_cpu)
cpu_data += SIZE(cpuinfo_x86);
}
}
/*
* "mach -m"
*/
static char *e820type[] = {
"(invalid type)",
"E820_RAM",
"E820_RESERVED",
"E820_ACPI",
"E820_NVS",
"E820_UNUSABLE",
};
static void
x86_64_display_memmap(void)
{
ulong e820;
int nr_map, i;
char *buf, *e820entry_ptr;
ulonglong addr, size;
uint type;
e820 = symbol_value("e820");
if (CRASHDEBUG(1))
dump_struct("e820map", e820, RADIX(16));
buf = (char *)GETBUF(SIZE(e820map));
readmem(e820, KVADDR, &buf[0], SIZE(e820map),
"e820map", FAULT_ON_ERROR);
nr_map = INT(buf + OFFSET(e820map_nr_map));
fprintf(fp, " PHYSICAL ADDRESS RANGE TYPE\n");
for (i = 0; i < nr_map; i++) {
e820entry_ptr = buf + sizeof(int) + (SIZE(e820entry) * i);
addr = ULONGLONG(e820entry_ptr + OFFSET(e820entry_addr));
size = ULONGLONG(e820entry_ptr + OFFSET(e820entry_size));
type = UINT(e820entry_ptr + OFFSET(e820entry_type));
fprintf(fp, "%016llx - %016llx ", addr, addr+size);
if (type >= (sizeof(e820type)/sizeof(char *)))
fprintf(fp, "type %d\n", type);
else
fprintf(fp, "%s\n", e820type[type]);
}
}
static const char *hook_files[] = {
"arch/x86_64/kernel/entry.S",
"arch/x86_64/kernel/head.S",
"arch/x86_64/kernel/semaphore.c"
};
#define ENTRY_S ((char **)&hook_files[0])
#define HEAD_S ((char **)&hook_files[1])
#define SEMAPHORE_C ((char **)&hook_files[2])
static struct line_number_hook x86_64_line_number_hooks[] = {
{"ret_from_fork", ENTRY_S},
{"system_call", ENTRY_S},
{"int_ret_from_sys_call", ENTRY_S},
{"ptregscall_common", ENTRY_S},
{"stub_execve", ENTRY_S},
{"stub_rt_sigreturn", ENTRY_S},
{"common_interrupt", ENTRY_S},
{"ret_from_intr", ENTRY_S},
{"load_gs_index", ENTRY_S},
{"arch_kernel_thread", ENTRY_S},
{"execve", ENTRY_S},
{"page_fault", ENTRY_S},
{"coprocessor_error", ENTRY_S},
{"simd_coprocessor_error", ENTRY_S},
{"device_not_available", ENTRY_S},
{"debug", ENTRY_S},
{"nmi", ENTRY_S},
{"int3", ENTRY_S},
{"overflow", ENTRY_S},
{"bounds", ENTRY_S},
{"invalid_op", ENTRY_S},
{"coprocessor_segment_overrun", ENTRY_S},
{"reserved", ENTRY_S},
{"double_fault", ENTRY_S},
{"invalid_TSS", ENTRY_S},
{"segment_not_present", ENTRY_S},
{"stack_segment", ENTRY_S},
{"general_protection", ENTRY_S},
{"alignment_check", ENTRY_S},
{"divide_error", ENTRY_S},
{"spurious_interrupt_bug", ENTRY_S},
{"machine_check", ENTRY_S},
{"call_debug", ENTRY_S},
{NULL, NULL} /* list must be NULL-terminated */
};
static void
x86_64_dump_line_number(ulong callpc)
{
error(FATAL, "x86_64_dump_line_number: TBD\n");
}
void
x86_64_compiler_warning_stub(void)
{
struct line_number_hook *lhp;
char **p ATTRIBUTE_UNUSED;
lhp = &x86_64_line_number_hooks[0]; lhp++;
p = ENTRY_S;
x86_64_back_trace(NULL, NULL);
get_x86_64_frame(NULL, NULL, NULL);
x86_64_dump_line_number(0);
}
/*
* Force the VM address-range selection via:
*
* --machdep vm=orig
* --machdep vm=2.6.11
*
* Force the phys_base address via:
*
* --machdep phys_base=<address>
*
* Force the IRQ stack back-link via:
*
* --machdep irq_eframe_link=<offset>
*
* Force max_physmem_bits via:
*
* --machdep max_physmem_bits=<count>
*/
void
parse_cmdline_args(void)
{
int index, i, c, errflag;
char *p;
char buf[BUFSIZE];
char *arglist[MAXARGS];
int megabytes;
int lines = 0;
int vm_flag;
ulong value;
for (index = 0; index < MAX_MACHDEP_ARGS; index++) {
if (!machdep->cmdline_args[index])
break;
if (!strstr(machdep->cmdline_args[index], "=")) {
error(WARNING, "ignoring --machdep option: %s\n\n",
machdep->cmdline_args[index]);
continue;
}
strcpy(buf, machdep->cmdline_args[index]);
for (p = buf; *p; p++) {
if (*p == ',')
*p = ' ';
}
c = parse_line(buf, arglist);
for (i = vm_flag = 0; i < c; i++) {
errflag = 0;
if (STRNEQ(arglist[i], "vm=")) {
vm_flag++;
p = arglist[i] + strlen("vm=");
if (strlen(p)) {
if (STREQ(p, "orig")) {
machdep->flags |= VM_ORIG;
continue;
} else if (STREQ(p, "2.6.11")) {
machdep->flags |= VM_2_6_11;
continue;
} else if (STREQ(p, "xen")) {
machdep->flags |= VM_XEN;
continue;
} else if (STREQ(p, "xen-rhel4")) {
machdep->flags |= VM_XEN_RHEL4;
continue;
}
}
} else if (STRNEQ(arglist[i], "phys_base=")) {
megabytes = FALSE;
if ((LASTCHAR(arglist[i]) == 'm') ||
(LASTCHAR(arglist[i]) == 'M')) {
LASTCHAR(arglist[i]) = NULLCHAR;
megabytes = TRUE;
}
p = arglist[i] + strlen("phys_base=");
if (strlen(p)) {
if (megabytes) {
value = dtol(p, RETURN_ON_ERROR|QUIET,
&errflag);
} else
value = htol(p, RETURN_ON_ERROR|QUIET,
&errflag);
if (!errflag) {
if (megabytes)
value = MEGABYTES(value);
machdep->machspec->phys_base = value;
error(NOTE,
"setting phys_base to: 0x%lx\n\n",
machdep->machspec->phys_base);
machdep->flags |= PHYS_BASE;
continue;
}
}
} else if (STRNEQ(arglist[i], "irq_eframe_link=")) {
p = arglist[i] + strlen("irq_eframe_link=");
if (strlen(p)) {
value = stol(p, RETURN_ON_ERROR|QUIET, &errflag);
if (!errflag) {
machdep->machspec->irq_eframe_link = value;
continue;
}
}
} else if (STRNEQ(arglist[i], "max_physmem_bits=")) {
p = arglist[i] + strlen("max_physmem_bits=");
if (strlen(p)) {
value = stol(p, RETURN_ON_ERROR|QUIET, &errflag);
if (!errflag) {
machdep->max_physmem_bits = value;
error(NOTE,
"setting max_physmem_bits to: %ld\n\n",
machdep->max_physmem_bits);
continue;
}
}
}
error(WARNING, "ignoring --machdep option: %s\n", arglist[i]);
lines++;
}
if (vm_flag) {
switch (machdep->flags & VM_FLAGS)
{
case 0:
break;
case VM_ORIG:
error(NOTE, "using original x86_64 VM address ranges\n");
lines++;
break;
case VM_2_6_11:
error(NOTE, "using 2.6.11 x86_64 VM address ranges\n");
lines++;
break;
case VM_XEN:
error(NOTE, "using xen x86_64 VM address ranges\n");
lines++;
break;
case VM_XEN_RHEL4:
error(NOTE, "using RHEL4 xen x86_64 VM address ranges\n");
lines++;
break;
default:
error(WARNING, "cannot set multiple vm values\n");
lines++;
machdep->flags &= ~VM_FLAGS;
break;
}
}
if (lines)
fprintf(fp, "\n");
}
}
void
x86_64_clear_machdep_cache(void)
{
machdep->machspec->last_upml_read = 0;
}
#define PUSH_RBP_MOV_RSP_RBP 0xe5894855
static void
x86_64_framepointer_init(void)
{
unsigned int push_rbp_mov_rsp_rbp;
int i, check;
char *checkfuncs[] = {"sys_open", "sys_fork", "sys_read",
"do_futex", "do_fork", "vfs_read"};
if (pc->flags & KERNEL_DEBUG_QUERY)
return;
for (i = check = 0; i < 6; i++) {
if (!kernel_symbol_exists(checkfuncs[i]))
continue;
if (!readmem(symbol_value(checkfuncs[i]), KVADDR,
&push_rbp_mov_rsp_rbp, sizeof(uint),
"framepointer check", RETURN_ON_ERROR))
return;
if ((push_rbp_mov_rsp_rbp == 0x66666666) ||
(push_rbp_mov_rsp_rbp == 0x00441f0f)) {
if (!readmem(symbol_value(checkfuncs[i]) + 5,
KVADDR, &push_rbp_mov_rsp_rbp, sizeof(uint),
"framepointer check", RETURN_ON_ERROR))
return;
}
if (push_rbp_mov_rsp_rbp == PUSH_RBP_MOV_RSP_RBP)
check++;
}
if (check >= 3)
machdep->flags |= FRAMEPOINTER;
}
static ulong
search_for_switch_to(ulong start, ulong end)
{
ulong max_instructions, address;
char buf1[BUFSIZE];
char search_string1[BUFSIZE];
char search_string2[BUFSIZE];
int found;
max_instructions = end - start;
found = FALSE;
sprintf(buf1, "x/%ldi 0x%lx", max_instructions, start);
if (symbol_exists("__switch_to")) {
sprintf(search_string1,
"callq 0x%lx", symbol_value("__switch_to"));
sprintf(search_string2,
"call 0x%lx", symbol_value("__switch_to"));
} else {
search_string1[0] = NULLCHAR;
search_string2[0] = NULLCHAR;
}
open_tmpfile();
if (!gdb_pass_through(buf1, pc->tmpfile, GNU_RETURN_ON_ERROR))
return FALSE;
rewind(pc->tmpfile);
while (fgets(buf1, BUFSIZE, pc->tmpfile)) {
if (found)
break;
if (strstr(buf1, "<__switch_to>"))
found = TRUE;
if (strlen(search_string1) && strstr(buf1, search_string1))
found = TRUE;
if (strlen(search_string2) && strstr(buf1, search_string2))
found = TRUE;
}
close_tmpfile();
if (found && extract_hex(buf1, &address, ':', TRUE))
return address;
return 0;
}
static void
x86_64_thread_return_init(void)
{
struct syment *sp, *spn;
ulong address;
if ((sp = kernel_symbol_search("thread_return"))) {
machdep->machspec->thread_return = sp->value;
return;
}
if ((sp = kernel_symbol_search("schedule")) &&
(spn = next_symbol(NULL, sp)) &&
(address = search_for_switch_to(sp->value, spn->value))) {
machdep->machspec->thread_return = address;
return;
}
if ((sp = kernel_symbol_search("__schedule")) &&
(spn = next_symbol(NULL, sp)) &&
(address = search_for_switch_to(sp->value, spn->value))) {
machdep->machspec->thread_return = address;
return;
}
error(INFO, "cannot determine thread return address\n");
machdep->machspec->thread_return =
(sp = kernel_symbol_search("schedule")) ? sp->value : 0;
}
static void
x86_64_irq_eframe_link_init(void)
{
int c;
struct syment *sp, *spn;
char buf[BUFSIZE];
char link_register[BUFSIZE];
char *arglist[MAXARGS];
ulong max_instructions;
if (machdep->machspec->irq_eframe_link == UNINITIALIZED)
machdep->machspec->irq_eframe_link = 0;
else
return;
if (THIS_KERNEL_VERSION < LINUX(2,6,9))
return;
if (!(sp = symbol_search("common_interrupt")) ||
!(spn = next_symbol(NULL, sp))) {
return;
}
max_instructions = spn->value - sp->value;
open_tmpfile();
sprintf(buf, "x/%ldi 0x%lx",
max_instructions, sp->value);
if (!gdb_pass_through(buf, pc->tmpfile, GNU_RETURN_ON_ERROR))
return;
link_register[0] = NULLCHAR;
rewind(pc->tmpfile);
while (fgets(buf, BUFSIZE, pc->tmpfile)) {
if (!strstr(buf, sp->name))
break;
if ((c = parse_line(buf, arglist)) < 4)
continue;
if (strstr(arglist[2], "push"))
strcpy(link_register, arglist[3]);
}
close_tmpfile();
if (CRASHDEBUG(1))
fprintf(fp, "IRQ stack link register: %s\n",
strlen(link_register) ?
link_register : "undetermined");
if (STREQ(link_register, "%rbp"))
machdep->machspec->irq_eframe_link = 40;
else if (THIS_KERNEL_VERSION >= LINUX(2,6,29))
machdep->machspec->irq_eframe_link = 40;
}
/*
* Calculate and verify the IRQ exception frame location from the
* stack reference at the top of the IRQ stack, possibly adjusting
* the ms->irq_eframe_link value.
*/
static ulong
x86_64_irq_eframe_link(ulong stkref, struct bt_info *bt, FILE *ofp)
{
ulong irq_eframe;
irq_eframe = stkref - machdep->machspec->irq_eframe_link;
if (x86_64_exception_frame(EFRAME_VERIFY, irq_eframe, 0, bt, ofp))
return irq_eframe;
if (x86_64_exception_frame(EFRAME_VERIFY, irq_eframe+8, 0, bt, ofp)) {
machdep->machspec->irq_eframe_link -= 8;
return (irq_eframe + 8);
}
return irq_eframe;
}
#include "netdump.h"
/*
* From the xen vmcore, create an index of mfns for each page that makes
* up the dom0 kernel's complete phys_to_machine_mapping[max_pfn] array.
*/
#define MAX_X86_64_FRAMES (512)
#define MFNS_PER_FRAME (PAGESIZE()/sizeof(ulong))
static int
x86_64_xen_kdump_p2m_create(struct xen_kdump_data *xkd)
{
int i, j;
ulong kvaddr;
ulong *up;
ulong frames;
ulong frame_mfn[MAX_X86_64_FRAMES] = { 0 };
int mfns[MAX_X86_64_FRAMES] = { 0 };
struct syment *sp;
/*
* Temporarily read physical (machine) addresses from vmcore by
* going directly to read_netdump() instead of via read_kdump().
*/
pc->readmem = read_netdump;
if (CRASHDEBUG(1))
fprintf(fp, "readmem (temporary): read_netdump()\n");
if (xkd->flags & KDUMP_CR3)
goto use_cr3;
if (CRASHDEBUG(1))
fprintf(fp, "x86_64_xen_kdump_p2m_create: p2m_mfn: %lx\n",
xkd->p2m_mfn);
if (!readmem(PTOB(xkd->p2m_mfn), PHYSADDR, xkd->page, PAGESIZE(),
"xen kdump p2m mfn page", RETURN_ON_ERROR))
error(FATAL, "cannot read xen kdump p2m mfn page\n");
if (CRASHDEBUG(2))
x86_64_debug_dump_page(fp, xkd->page, "pfn_to_mfn_frame_list");
for (i = 0, up = (ulong *)xkd->page; i < MAX_X86_64_FRAMES; i++, up++)
frame_mfn[i] = *up;
for (i = 0; i < MAX_X86_64_FRAMES; i++) {
if (!frame_mfn[i])
break;
if (!readmem(PTOB(frame_mfn[i]), PHYSADDR, xkd->page,
PAGESIZE(), "xen kdump p2m mfn list page", RETURN_ON_ERROR))
error(FATAL, "cannot read xen kdump p2m mfn list page\n");
for (j = 0, up = (ulong *)xkd->page; j < MFNS_PER_FRAME; j++, up++)
if (*up)
mfns[i]++;
xkd->p2m_frames += mfns[i];
if (CRASHDEBUG(7))
x86_64_debug_dump_page(fp, xkd->page, "pfn_to_mfn_frame_list page");
}
if (CRASHDEBUG(1))
fprintf(fp, "p2m_frames: %d\n", xkd->p2m_frames);
if ((xkd->p2m_mfn_frame_list = (ulong *)
malloc(xkd->p2m_frames * sizeof(ulong))) == NULL)
error(FATAL, "cannot malloc p2m_frame_index_list");
for (i = 0, frames = xkd->p2m_frames; frames; i++) {
if (!readmem(PTOB(frame_mfn[i]), PHYSADDR,
&xkd->p2m_mfn_frame_list[i * MFNS_PER_FRAME],
mfns[i] * sizeof(ulong), "xen kdump p2m mfn list page",
RETURN_ON_ERROR))
error(FATAL, "cannot read xen kdump p2m mfn list page\n");
frames -= mfns[i];
}
if (CRASHDEBUG(2)) {
for (i = 0; i < xkd->p2m_frames; i++)
fprintf(fp, "%lx ", xkd->p2m_mfn_frame_list[i]);
fprintf(fp, "\n");
}
pc->readmem = read_kdump;
if (CRASHDEBUG(1))
fprintf(fp, "readmem (restore): read_kdump()\n");
return TRUE;
use_cr3:
if (CRASHDEBUG(1))
fprintf(fp, "x86_64_xen_kdump_p2m_create: cr3: %lx\n", xkd->cr3);
if (!readmem(PTOB(xkd->cr3), PHYSADDR, machdep->machspec->pml4,
PAGESIZE(), "xen kdump cr3 page", RETURN_ON_ERROR))
error(FATAL, "cannot read xen kdump cr3 page\n");
if (CRASHDEBUG(7))
x86_64_debug_dump_page(fp, machdep->machspec->pml4,
"contents of PML4 page:");
/*
* kernel version < 2.6.27 => end_pfn
* kernel version >= 2.6.27 => max_pfn
*/
if ((sp = symbol_search("end_pfn")))
kvaddr = sp->value;
else
kvaddr = symbol_value("max_pfn");
if (!x86_64_xen_kdump_load_page(kvaddr, xkd->page))
return FALSE;
up = (ulong *)(xkd->page + PAGEOFFSET(kvaddr));
xkd->p2m_frames = (*up/(PAGESIZE()/sizeof(ulong))) +
((*up%(PAGESIZE()/sizeof(ulong))) ? 1 : 0);
if (CRASHDEBUG(1))
fprintf(fp, "end_pfn at %lx: %lx (%ld) -> %d p2m_frames\n",
kvaddr, *up, *up, xkd->p2m_frames);
if ((xkd->p2m_mfn_frame_list = (ulong *)
malloc(xkd->p2m_frames * sizeof(ulong))) == NULL)
error(FATAL, "cannot malloc p2m_frame_index_list");
kvaddr = symbol_value("phys_to_machine_mapping");
if (!x86_64_xen_kdump_load_page(kvaddr, xkd->page))
return FALSE;
up = (ulong *)(xkd->page + PAGEOFFSET(kvaddr));
kvaddr = *up;
if (CRASHDEBUG(1))
fprintf(fp, "phys_to_machine_mapping: %lx\n", kvaddr);
machdep->last_pgd_read = BADADDR;
machdep->last_pmd_read = BADADDR;
machdep->last_ptbl_read = BADADDR;
for (i = 0; i < xkd->p2m_frames; i++) {
xkd->p2m_mfn_frame_list[i] = x86_64_xen_kdump_page_mfn(kvaddr);
kvaddr += PAGESIZE();
}
if (CRASHDEBUG(1)) {
for (i = 0; i < xkd->p2m_frames; i++)
fprintf(fp, "%lx ", xkd->p2m_mfn_frame_list[i]);
fprintf(fp, "\n");
}
machdep->last_pgd_read = 0;
machdep->last_ptbl_read = 0;
machdep->last_pmd_read = 0;
pc->readmem = read_kdump;
if (CRASHDEBUG(1))
fprintf(fp, "readmem (restore): read_kdump()\n");
return TRUE;
}
static char *
x86_64_xen_kdump_load_page(ulong kvaddr, char *pgbuf)
{
ulong mfn;
ulong *pml4, *pgd, *pmd, *ptep;
pml4 = ((ulong *)machdep->machspec->pml4) + pml4_index(kvaddr);
mfn = ((*pml4) & PHYSICAL_PAGE_MASK) >> PAGESHIFT();
if (CRASHDEBUG(3))
fprintf(fp,
"[%lx] pml4: %lx mfn: %lx pml4_index: %lx\n",
kvaddr, *pml4, mfn, pml4_index(kvaddr));
if (!readmem(PTOB(mfn), PHYSADDR, machdep->pgd, PAGESIZE(),
"xen kdump pud page", RETURN_ON_ERROR))
error(FATAL, "cannot read/find pud page\n");
machdep->last_pgd_read = mfn;
if (CRASHDEBUG(7))
x86_64_debug_dump_page(fp, machdep->pgd,
"contents of page upper directory page:");
pgd = ((ulong *)machdep->pgd) + pgd_index(kvaddr);
mfn = ((*pgd) & PHYSICAL_PAGE_MASK) >> PAGESHIFT();
if (CRASHDEBUG(3))
fprintf(fp,
"[%lx] pgd: %lx mfn: %lx pgd_index: %lx\n",
kvaddr, *pgd, mfn, pgd_index(kvaddr));
if (!readmem(PTOB(mfn), PHYSADDR, machdep->pmd, PAGESIZE(),
"xen kdump pmd page", RETURN_ON_ERROR))
error(FATAL, "cannot read/find pmd page\n");
machdep->last_pmd_read = mfn;
if (CRASHDEBUG(7))
x86_64_debug_dump_page(fp, machdep->pmd,
"contents of page middle directory page:");
pmd = ((ulong *)machdep->pmd) + pmd_index(kvaddr);
mfn = ((*pmd) & PHYSICAL_PAGE_MASK) >> PAGESHIFT();
if (CRASHDEBUG(3))
fprintf(fp,
"[%lx] pmd: %lx mfn: %lx pmd_index: %lx\n",
kvaddr, *pmd, mfn, pmd_index(kvaddr));
if (!readmem(PTOB(mfn), PHYSADDR, machdep->ptbl, PAGESIZE(),
"xen kdump page table page", RETURN_ON_ERROR))
error(FATAL, "cannot read/find page table page\n");
machdep->last_ptbl_read = mfn;
if (CRASHDEBUG(7))
x86_64_debug_dump_page(fp, machdep->ptbl,
"contents of page table page:");
ptep = ((ulong *)machdep->ptbl) + pte_index(kvaddr);
mfn = ((*ptep) & PHYSICAL_PAGE_MASK) >> PAGESHIFT();
if (CRASHDEBUG(3))
fprintf(fp,
"[%lx] ptep: %lx mfn: %lx pte_index: %lx\n",
kvaddr, *ptep, mfn, pte_index(kvaddr));
if (!readmem(PTOB(mfn), PHYSADDR, pgbuf, PAGESIZE(),
"xen kdump page table page", RETURN_ON_ERROR))
error(FATAL, "cannot read/find pte page\n");
if (CRASHDEBUG(7))
x86_64_debug_dump_page(fp, pgbuf,
"contents of page:");
return pgbuf;
}
static ulong
x86_64_xen_kdump_page_mfn(ulong kvaddr)
{
ulong mfn;
ulong *pml4, *pgd, *pmd, *ptep;
pml4 = ((ulong *)machdep->machspec->pml4) + pml4_index(kvaddr);
mfn = ((*pml4) & PHYSICAL_PAGE_MASK) >> PAGESHIFT();
if ((mfn != machdep->last_pgd_read) &&
!readmem(PTOB(mfn), PHYSADDR, machdep->pgd, PAGESIZE(),
"xen kdump pud entry", RETURN_ON_ERROR))
error(FATAL, "cannot read/find pud page\n");
machdep->last_pgd_read = mfn;
pgd = ((ulong *)machdep->pgd) + pgd_index(kvaddr);
mfn = ((*pgd) & PHYSICAL_PAGE_MASK) >> PAGESHIFT();
if ((mfn != machdep->last_pmd_read) &&
!readmem(PTOB(mfn), PHYSADDR, machdep->pmd, PAGESIZE(),
"xen kdump pmd entry", RETURN_ON_ERROR))
error(FATAL, "cannot read/find pmd page\n");
machdep->last_pmd_read = mfn;
pmd = ((ulong *)machdep->pmd) + pmd_index(kvaddr);
mfn = ((*pmd) & PHYSICAL_PAGE_MASK) >> PAGESHIFT();
if ((mfn != machdep->last_ptbl_read) &&
!readmem(PTOB(mfn), PHYSADDR, machdep->ptbl, PAGESIZE(),
"xen kdump page table page", RETURN_ON_ERROR))
error(FATAL, "cannot read/find page table page\n");
machdep->last_ptbl_read = mfn;
ptep = ((ulong *)machdep->ptbl) + pte_index(kvaddr);
mfn = ((*ptep) & PHYSICAL_PAGE_MASK) >> PAGESHIFT();
return mfn;
}
#include "xendump.h"
/*
* Determine the physical address base for relocatable kernels.
*/
static void
x86_64_calc_phys_base(void)
{
int i;
FILE *iomem;
char buf[BUFSIZE];
char *p1;
ulong phys_base, text_start, kernel_code_start;
int errflag;
struct vmcore_data *vd;
static struct xendump_data *xd;
Elf64_Phdr *phdr;
if (machdep->flags & PHYS_BASE) /* --machdep override */
return;
machdep->machspec->phys_base = 0; /* default/traditional */
if (pc->flags2 & GET_LOG)
text_start = BADADDR;
else {
if (!kernel_symbol_exists("phys_base"))
return;
if (!symbol_exists("_text"))
return;
else
text_start = symbol_value("_text");
if (REMOTE()) {
phys_base = get_remote_phys_base(text_start, symbol_value("phys_base"));
if (phys_base) {
machdep->machspec->phys_base = phys_base;
if (CRASHDEBUG(1)) {
fprintf(fp, "_text: %lx ", text_start);
fprintf(fp, "phys_base: %lx\n\n",
machdep->machspec->phys_base);
}
return;
}
}
}
if (ACTIVE()) {
if ((iomem = fopen("/proc/iomem", "r")) == NULL)
return;
errflag = 1;
while (fgets(buf, BUFSIZE, iomem)) {
if (strstr(buf, ": Kernel code")) {
clean_line(buf);
errflag = 0;
break;
}
}
fclose(iomem);
if (errflag)
return;
if (!(p1 = strstr(buf, "-")))
return;
else
*p1 = NULLCHAR;
errflag = 0;
kernel_code_start = htol(buf, RETURN_ON_ERROR|QUIET, &errflag);
if (errflag)
return;
machdep->machspec->phys_base = kernel_code_start -
(text_start - __START_KERNEL_map);
if (CRASHDEBUG(1)) {
fprintf(fp, "_text: %lx ", text_start);
fprintf(fp, "Kernel code: %lx -> ", kernel_code_start);
fprintf(fp, "phys_base: %lx\n\n",
machdep->machspec->phys_base);
}
return;
}
/*
* Get relocation value from whatever dumpfile format is being used.
*/
if (DISKDUMP_DUMPFILE()) {
if (diskdump_phys_base(&phys_base)) {
machdep->machspec->phys_base = phys_base;
if ((pc->flags2 & QEMU_MEM_DUMP_COMPRESSED) &&
!x86_64_virt_phys_base())
error(WARNING,
"cannot determine physical base address:"
" defaulting to %lx\n\n",
machdep->machspec->phys_base);
if (CRASHDEBUG(1))
fprintf(fp, "compressed kdump: phys_base: %lx\n",
phys_base);
}
return;
}
if (KVMDUMP_DUMPFILE()) {
if (kvmdump_phys_base(&phys_base)) {
machdep->machspec->phys_base = phys_base;
if (CRASHDEBUG(1))
fprintf(fp, "kvmdump: phys_base: %lx\n",
phys_base);
} else {
machdep->machspec->phys_base = phys_base;
if (!x86_64_virt_phys_base())
error(WARNING,
"cannot determine physical base address:"
" defaulting to %lx\n\n",
phys_base);
}
return;
}
if (SADUMP_DUMPFILE()) {
if (sadump_phys_base(&phys_base)) {
machdep->machspec->phys_base = phys_base;
if (CRASHDEBUG(1))
fprintf(fp, "sadump: phys_base: %lx\n",
phys_base);
} else {
machdep->machspec->phys_base = phys_base;
if (!x86_64_virt_phys_base())
error(WARNING,
"cannot determine physical base address:"
" defaulting to %lx\n\n",
phys_base);
}
return;
}
if ((vd = get_kdump_vmcore_data())) {
for (i = 0; i < vd->num_pt_load_segments; i++) {
phdr = vd->load64 + i;
if ((phdr->p_vaddr >= __START_KERNEL_map) &&
!(IS_VMALLOC_ADDR(phdr->p_vaddr))) {
machdep->machspec->phys_base = phdr->p_paddr -
(phdr->p_vaddr & ~(__START_KERNEL_map));
if (CRASHDEBUG(1)) {
fprintf(fp, "p_vaddr: %lx p_paddr: %lx -> ",
phdr->p_vaddr, phdr->p_paddr);
fprintf(fp, "phys_base: %lx\n\n",
machdep->machspec->phys_base);
}
break;
}
}
if ((pc->flags2 & QEMU_MEM_DUMP_ELF) && !x86_64_virt_phys_base())
error(WARNING,
"cannot determine physical base address:"
" defaulting to %lx\n\n",
machdep->machspec->phys_base);
return;
}
if ((xd = get_xendump_data())) {
if (text_start == __START_KERNEL_map) {
/*
* Xen kernels are not relocable (yet) and don't have
* the "phys_base" entry point, so this is most likely
* a xendump of a fully-virtualized relocatable kernel.
* No clues exist in the xendump header, so hardwire
* phys_base to 2MB and hope for the best.
*/
machdep->machspec->phys_base = 0x200000;
if (CRASHDEBUG(1))
fprintf(fp,
"default relocatable phys_base: %lx\n",
machdep->machspec->phys_base);
} else if (text_start > __START_KERNEL_map) {
switch (xd->flags & (XC_CORE_ELF|XC_CORE_NO_P2M))
{
/*
* If this is a new ELF-style xendump with no
* p2m information, then it also must be a
* fully-virtualized relocatable kernel. Again,
* the xendump header is useless, and we don't
* have /proc/iomem, so presume that the kernel
* code starts at 2MB.
*/
case (XC_CORE_ELF|XC_CORE_NO_P2M):
machdep->machspec->phys_base = 0x200000 -
(text_start - __START_KERNEL_map);
if (CRASHDEBUG(1))
fprintf(fp, "default relocatable "
"phys_base: %lx\n",
machdep->machspec->phys_base);
break;
default:
break;
}
}
if (xd->xc_core.header.xch_magic == XC_CORE_MAGIC_HVM)
x86_64_virt_phys_base();
}
}
/*
* Verify, or possibly override, the xendump/kvmdump phys_base
* calculation by trying to read linux_banner from a range of
* typical physical offsets.
*/
static int
x86_64_virt_phys_base(void)
{
char buf[BUFSIZE];
struct syment *sp;
ulong phys, linux_banner_phys;
if (!(sp = symbol_search("linux_banner")) ||
!((sp->type == 'R') || (sp->type == 'r')))
return FALSE;
linux_banner_phys = sp->value - __START_KERNEL_map;
if (readmem(linux_banner_phys + machdep->machspec->phys_base,
PHYSADDR, buf, strlen("Linux version"), "linux_banner verify",
QUIET|RETURN_ON_ERROR) && STRNEQ(buf, "Linux version"))
return TRUE;
for (phys = (ulong)(-MEGABYTES(16)); phys != MEGABYTES(16+1);
phys += MEGABYTES(1)) {
if (readmem(linux_banner_phys + phys, PHYSADDR, buf,
strlen("Linux version"), "linux_banner search",
QUIET|RETURN_ON_ERROR) && STRNEQ(buf, "Linux version")) {
if (CRASHDEBUG(1))
fprintf(fp,
"virtual dump phys_base: %lx %s\n", phys,
machdep->machspec->phys_base != phys ?
"override" : "");
machdep->machspec->phys_base = phys;
return TRUE;
}
}
return FALSE;
}
/*
* Create an index of mfns for each page that makes up the
* kernel's complete phys_to_machine_mapping[max_pfn] array.
*/
static int
x86_64_xendump_p2m_create(struct xendump_data *xd)
{
int i, idx;
ulong mfn, kvaddr, ctrlreg[8], ctrlreg_offset;
ulong *up;
off_t offset;
struct syment *sp;
/*
* Check for pvops Xen kernel before presuming it's HVM.
*/
if (symbol_exists("pv_init_ops") && symbol_exists("xen_patch") &&
(xd->xc_core.header.xch_magic == XC_CORE_MAGIC))
return x86_64_pvops_xendump_p2m_create(xd);
if (!symbol_exists("phys_to_machine_mapping")) {
xd->flags |= XC_CORE_NO_P2M;
return TRUE;
}
if ((ctrlreg_offset = MEMBER_OFFSET("vcpu_guest_context", "ctrlreg")) ==
INVALID_OFFSET)
error(FATAL,
"cannot determine vcpu_guest_context.ctrlreg offset\n");
else if (CRASHDEBUG(1))
fprintf(xd->ofp,
"MEMBER_OFFSET(vcpu_guest_context, ctrlreg): %ld\n",
ctrlreg_offset);
offset = xd->xc_core.header.xch_ctxt_offset +
(off_t)ctrlreg_offset;
if (lseek(xd->xfd, offset, SEEK_SET) == -1)
error(FATAL, "cannot lseek to xch_ctxt_offset\n");
if (read(xd->xfd, &ctrlreg, sizeof(ctrlreg)) !=
sizeof(ctrlreg))
error(FATAL, "cannot read vcpu_guest_context ctrlreg[8]\n");
for (i = 0; CRASHDEBUG(1) && (i < 8); i++)
fprintf(xd->ofp, "ctrlreg[%d]: %lx\n", i, ctrlreg[i]);
mfn = ctrlreg[3] >> PAGESHIFT();
if (!xc_core_mfn_to_page(mfn, machdep->machspec->pml4))
error(FATAL, "cannot read/find cr3 page\n");
if (CRASHDEBUG(7))
x86_64_debug_dump_page(xd->ofp, machdep->machspec->pml4,
"contents of PML4 page:");
/*
* kernel version < 2.6.27 => end_pfn
* kernel version >= 2.6.27 => max_pfn
*/
if ((sp = symbol_search("end_pfn")))
kvaddr = sp->value;
else
kvaddr = symbol_value("max_pfn");
if (!x86_64_xendump_load_page(kvaddr, xd))
return FALSE;
up = (ulong *)(xd->page + PAGEOFFSET(kvaddr));
if (CRASHDEBUG(1))
fprintf(xd->ofp, "end pfn: %lx\n", *up);
xd->xc_core.p2m_frames = (*up/(PAGESIZE()/sizeof(ulong))) +
((*up%(PAGESIZE()/sizeof(ulong))) ? 1 : 0);
if ((xd->xc_core.p2m_frame_index_list = (ulong *)
malloc(xd->xc_core.p2m_frames * sizeof(ulong))) == NULL)
error(FATAL, "cannot malloc p2m_frame_list");
kvaddr = symbol_value("phys_to_machine_mapping");
if (!x86_64_xendump_load_page(kvaddr, xd))
return FALSE;
up = (ulong *)(xd->page + PAGEOFFSET(kvaddr));
if (CRASHDEBUG(1))
fprintf(fp, "phys_to_machine_mapping: %lx\n", *up);
kvaddr = *up;
machdep->last_ptbl_read = BADADDR;
for (i = 0; i < xd->xc_core.p2m_frames; i++) {
if ((idx = x86_64_xendump_page_index(kvaddr, xd)) == MFN_NOT_FOUND)
return FALSE;
xd->xc_core.p2m_frame_index_list[i] = idx;
kvaddr += PAGESIZE();
}
machdep->last_ptbl_read = 0;
return TRUE;
}
static int
x86_64_pvops_xendump_p2m_create(struct xendump_data *xd)
{
int i;
ulong mfn, kvaddr, ctrlreg[8], ctrlreg_offset;
ulong *up;
off_t offset;
struct syment *sp;
if ((ctrlreg_offset = MEMBER_OFFSET("vcpu_guest_context", "ctrlreg")) ==
INVALID_OFFSET)
error(FATAL,
"cannot determine vcpu_guest_context.ctrlreg offset\n");
else if (CRASHDEBUG(1))
fprintf(xd->ofp,
"MEMBER_OFFSET(vcpu_guest_context, ctrlreg): %ld\n",
ctrlreg_offset);
offset = xd->xc_core.header.xch_ctxt_offset +
(off_t)ctrlreg_offset;
if (lseek(xd->xfd, offset, SEEK_SET) == -1)
error(FATAL, "cannot lseek to xch_ctxt_offset\n");
if (read(xd->xfd, &ctrlreg, sizeof(ctrlreg)) !=
sizeof(ctrlreg))
error(FATAL, "cannot read vcpu_guest_context ctrlreg[8]\n");
for (i = 0; CRASHDEBUG(1) && (i < 8); i++)
fprintf(xd->ofp, "ctrlreg[%d]: %lx\n", i, ctrlreg[i]);
mfn = ctrlreg[3] >> PAGESHIFT();
if (!xc_core_mfn_to_page(mfn, machdep->machspec->pml4))
error(FATAL, "cannot read/find cr3 page\n");
if (CRASHDEBUG(7))
x86_64_debug_dump_page(xd->ofp, machdep->machspec->pml4,
"contents of PML4 page:");
/*
* kernel version < 2.6.27 => end_pfn
* kernel version >= 2.6.27 => max_pfn
*/
if ((sp = symbol_search("end_pfn")))
kvaddr = sp->value;
else
kvaddr = symbol_value("max_pfn");
if (!x86_64_xendump_load_page(kvaddr, xd))
return FALSE;
up = (ulong *)(xd->page + PAGEOFFSET(kvaddr));
if (CRASHDEBUG(1))
fprintf(xd->ofp, "end pfn: %lx\n", *up);
xd->xc_core.p2m_frames = (*up/(PAGESIZE()/sizeof(ulong))) +
((*up%(PAGESIZE()/sizeof(ulong))) ? 1 : 0);
if ((xd->xc_core.p2m_frame_index_list = (ulong *)
malloc(xd->xc_core.p2m_frames * sizeof(ulong))) == NULL)
error(FATAL, "cannot malloc p2m_frame_list");
if (symbol_exists("p2m_mid_missing"))
return x86_64_pvops_xendump_p2m_l3_create(xd);
else
return x86_64_pvops_xendump_p2m_l2_create(xd);
}
static int x86_64_pvops_xendump_p2m_l2_create(struct xendump_data *xd)
{
int i, idx, p;
ulong kvaddr, *up;
machdep->last_ptbl_read = BADADDR;
kvaddr = symbol_value("p2m_top");
for (p = 0; p < xd->xc_core.p2m_frames; p += XEN_PFNS_PER_PAGE) {
if (!x86_64_xendump_load_page(kvaddr, xd))
return FALSE;
if (CRASHDEBUG(7))
x86_64_debug_dump_page(xd->ofp, xd->page,
"contents of page:");
up = (ulong *)(xd->page);
for (i = 0; i < XEN_PFNS_PER_PAGE; i++, up++) {
if ((p+i) >= xd->xc_core.p2m_frames)
break;
if ((idx = x86_64_xendump_page_index(*up, xd)) == MFN_NOT_FOUND)
return FALSE;
xd->xc_core.p2m_frame_index_list[p+i] = idx;
}
kvaddr += PAGESIZE();
}
machdep->last_ptbl_read = 0;
return TRUE;
}
static int x86_64_pvops_xendump_p2m_l3_create(struct xendump_data *xd)
{
int i, idx, j, p2m_frame, ret = FALSE;
ulong kvaddr, *p2m_mid, p2m_mid_missing, p2m_missing, *p2m_top;
p2m_top = NULL;
machdep->last_ptbl_read = BADADDR;
kvaddr = symbol_value("p2m_missing");
if (!x86_64_xendump_load_page(kvaddr, xd))
goto err;
p2m_missing = *(ulong *)(xd->page + PAGEOFFSET(kvaddr));
kvaddr = symbol_value("p2m_mid_missing");
if (!x86_64_xendump_load_page(kvaddr, xd))
goto err;
p2m_mid_missing = *(ulong *)(xd->page + PAGEOFFSET(kvaddr));
kvaddr = symbol_value("p2m_top");
if (!x86_64_xendump_load_page(kvaddr, xd))
goto err;
kvaddr = *(ulong *)(xd->page + PAGEOFFSET(kvaddr));
if (!x86_64_xendump_load_page(kvaddr, xd))
goto err;
if (CRASHDEBUG(7))
x86_64_debug_dump_page(xd->ofp, xd->page,
"contents of p2m_top page:");
p2m_top = (ulong *)GETBUF(PAGESIZE());
memcpy(p2m_top, xd->page, PAGESIZE());
for (i = 0; i < XEN_P2M_TOP_PER_PAGE; ++i) {
p2m_frame = i * XEN_P2M_MID_PER_PAGE;
if (p2m_frame >= xd->xc_core.p2m_frames)
break;
if (p2m_top[i] == p2m_mid_missing)
continue;
if (!x86_64_xendump_load_page(p2m_top[i], xd))
goto err;
if (CRASHDEBUG(7))
x86_64_debug_dump_page(xd->ofp, xd->page,
"contents of p2m_mid page:");
p2m_mid = (ulong *)xd->page;
for (j = 0; j < XEN_P2M_MID_PER_PAGE; ++j, ++p2m_frame) {
if (p2m_frame >= xd->xc_core.p2m_frames)
break;
if (p2m_mid[j] == p2m_missing)
continue;
idx = x86_64_xendump_page_index(p2m_mid[j], xd);
if (idx == MFN_NOT_FOUND)
goto err;
xd->xc_core.p2m_frame_index_list[p2m_frame] = idx;
}
}
machdep->last_ptbl_read = 0;
ret = TRUE;
err:
if (p2m_top)
FREEBUF(p2m_top);
return ret;
}
static void
x86_64_debug_dump_page(FILE *ofp, char *page, char *name)
{
int i;
ulong *up;
fprintf(ofp, "%s\n", name);
up = (ulong *)page;
for (i = 0; i < 256; i++) {
fprintf(ofp, "%016lx: %016lx %016lx\n",
(ulong)((i * 2) * sizeof(ulong)),
*up, *(up+1));
up += 2;
}
}
/*
* Find the page associate with the kvaddr, and read its contents
* into the passed-in buffer.
*/
static char *
x86_64_xendump_load_page(ulong kvaddr, struct xendump_data *xd)
{
ulong mfn;
ulong *pml4, *pgd, *pmd, *ptep;
pml4 = ((ulong *)machdep->machspec->pml4) + pml4_index(kvaddr);
mfn = ((*pml4) & PHYSICAL_PAGE_MASK) >> PAGESHIFT();
if (CRASHDEBUG(3))
fprintf(xd->ofp,
"[%lx] pml4: %lx mfn: %lx pml4_index: %lx\n",
kvaddr, *pml4, mfn, pml4_index(kvaddr));
if (!xc_core_mfn_to_page(mfn, machdep->pgd))
error(FATAL, "cannot read/find pud page\n");
machdep->last_pgd_read = mfn;
if (CRASHDEBUG(7))
x86_64_debug_dump_page(xd->ofp, machdep->pgd,
"contents of page upper directory page:");
pgd = ((ulong *)machdep->pgd) + pgd_index(kvaddr);
mfn = ((*pgd) & PHYSICAL_PAGE_MASK) >> PAGESHIFT();
if (CRASHDEBUG(3))
fprintf(xd->ofp,
"[%lx] pgd: %lx mfn: %lx pgd_index: %lx\n",
kvaddr, *pgd, mfn, pgd_index(kvaddr));
if (!xc_core_mfn_to_page(mfn, machdep->pmd))
error(FATAL, "cannot read/find pmd page\n");
machdep->last_pmd_read = mfn;
if (CRASHDEBUG(7))
x86_64_debug_dump_page(xd->ofp, machdep->pmd,
"contents of page middle directory page:");
pmd = ((ulong *)machdep->pmd) + pmd_index(kvaddr);
mfn = ((*pmd) & PHYSICAL_PAGE_MASK) >> PAGESHIFT();
if (CRASHDEBUG(3))
fprintf(xd->ofp,
"[%lx] pmd: %lx mfn: %lx pmd_index: %lx\n",
kvaddr, *pmd, mfn, pmd_index(kvaddr));
if (!xc_core_mfn_to_page(mfn, machdep->ptbl))
error(FATAL, "cannot read/find page table page\n");
machdep->last_ptbl_read = mfn;
if (CRASHDEBUG(7))
x86_64_debug_dump_page(xd->ofp, machdep->ptbl,
"contents of page table page:");
ptep = ((ulong *)machdep->ptbl) + pte_index(kvaddr);
mfn = ((*ptep) & PHYSICAL_PAGE_MASK) >> PAGESHIFT();
if (CRASHDEBUG(3))
fprintf(xd->ofp,
"[%lx] ptep: %lx mfn: %lx pte_index: %lx\n",
kvaddr, *ptep, mfn, pte_index(kvaddr));
if (!xc_core_mfn_to_page(mfn, xd->page))
error(FATAL, "cannot read/find pte page\n");
if (CRASHDEBUG(7))
x86_64_debug_dump_page(xd->ofp, xd->page,
"contents of page:");
return xd->page;
}
/*
* Find the dumpfile page index associated with the kvaddr.
*/
static int
x86_64_xendump_page_index(ulong kvaddr, struct xendump_data *xd)
{
int idx;
ulong mfn;
ulong *pml4, *pgd, *pmd, *ptep;
pml4 = ((ulong *)machdep->machspec->pml4) + pml4_index(kvaddr);
mfn = ((*pml4) & PHYSICAL_PAGE_MASK) >> PAGESHIFT();
if ((mfn != machdep->last_pgd_read) &&
!xc_core_mfn_to_page(mfn, machdep->pgd))
error(FATAL, "cannot read/find pud page\n");
machdep->last_pgd_read = mfn;
pgd = ((ulong *)machdep->pgd) + pgd_index(kvaddr);
mfn = ((*pgd) & PHYSICAL_PAGE_MASK) >> PAGESHIFT();
if ((mfn != machdep->last_pmd_read) &&
!xc_core_mfn_to_page(mfn, machdep->pmd))
error(FATAL, "cannot read/find pmd page\n");
machdep->last_pmd_read = mfn;
pmd = ((ulong *)machdep->pmd) + pmd_index(kvaddr);
mfn = ((*pmd) & PHYSICAL_PAGE_MASK) >> PAGESHIFT();
if ((mfn != machdep->last_ptbl_read) &&
!xc_core_mfn_to_page(mfn, machdep->ptbl))
error(FATAL, "cannot read/find page table page\n");
machdep->last_ptbl_read = mfn;
ptep = ((ulong *)machdep->ptbl) + pte_index(kvaddr);
mfn = ((*ptep) & PHYSICAL_PAGE_MASK) >> PAGESHIFT();
if ((idx = xc_core_mfn_to_page_index(mfn)) == MFN_NOT_FOUND)
error(INFO, "cannot determine page index for %lx\n",
kvaddr);
return idx;
}
/*
* Pull the rsp from the cpu_user_regs struct in the header
* turn it into a task, and match it with the active_set.
* Unfortunately, the registers in the vcpu_guest_context
* are not necessarily those of the panic task, so for now
* let get_active_set_panic_task() get the right task.
*/
static ulong
x86_64_xendump_panic_task(struct xendump_data *xd)
{
int i;
ulong rsp;
off_t offset;
ulong task;
if (INVALID_MEMBER(vcpu_guest_context_user_regs) ||
INVALID_MEMBER(cpu_user_regs_esp))
return NO_TASK;
offset = xd->xc_core.header.xch_ctxt_offset +
(off_t)OFFSET(vcpu_guest_context_user_regs) +
(off_t)OFFSET(cpu_user_regs_rsp);
if (lseek(xd->xfd, offset, SEEK_SET) == -1)
return NO_TASK;
if (read(xd->xfd, &rsp, sizeof(ulong)) != sizeof(ulong))
return NO_TASK;
if (IS_KVADDR(rsp) && (task = stkptr_to_task(rsp))) {
for (i = 0; i < NR_CPUS; i++) {
if (task == tt->active_set[i]) {
if (CRASHDEBUG(0))
error(INFO,
"x86_64_xendump_panic_task: rsp: %lx -> task: %lx\n",
rsp, task);
return task;
}
}
error(WARNING,
"x86_64_xendump_panic_task: rsp: %lx -> task: %lx (not active)\n",
rsp);
}
return NO_TASK;
}
/*
* Because of an off-by-one vcpu bug in early xc_domain_dumpcore()
* instantiations, the registers in the vcpu_guest_context are not
* necessarily those of the panic task. Furthermore, the rsp is
* seemingly unassociated with the task, presumably due a hypervisor
* callback, so only accept the contents if they retfer to the panic
* task's stack.
*/
static void
x86_64_get_xendump_regs(struct xendump_data *xd, struct bt_info *bt, ulong *rip, ulong *rsp)
{
ulong task, xrip, xrsp;
off_t offset;
struct syment *sp;
char *rip_symbol;
int cpu;
if (INVALID_MEMBER(vcpu_guest_context_user_regs) ||
INVALID_MEMBER(cpu_user_regs_rip) ||
INVALID_MEMBER(cpu_user_regs_rsp))
goto generic;
offset = xd->xc_core.header.xch_ctxt_offset +
(off_t)OFFSET(vcpu_guest_context_user_regs) +
(off_t)OFFSET(cpu_user_regs_rsp);
if (lseek(xd->xfd, offset, SEEK_SET) == -1)
goto generic;
if (read(xd->xfd, &xrsp, sizeof(ulong)) != sizeof(ulong))
goto generic;
offset = xd->xc_core.header.xch_ctxt_offset +
(off_t)OFFSET(vcpu_guest_context_user_regs) +
(off_t)OFFSET(cpu_user_regs_rip);
if (lseek(xd->xfd, offset, SEEK_SET) == -1)
goto generic;
if (read(xd->xfd, &xrip, sizeof(ulong)) != sizeof(ulong))
goto generic;
/*
* This works -- comes from smp_send_stop call in panic.
* But xendump_panic_hook() will forestall this function
* from being called (for now).
*/
if (IS_KVADDR(xrsp) && (task = stkptr_to_task(xrsp)) &&
(task == bt->task)) {
if (CRASHDEBUG(1))
fprintf(xd->ofp,
"hooks from vcpu_guest_context: rip: %lx rsp: %lx\n", xrip, xrsp);
*rip = xrip;
*rsp = xrsp;
return;
}
generic:
machdep->get_stack_frame(bt, rip, rsp);
/*
* If this is an active task showing itself in schedule(),
* then the thread_struct rsp is stale. It has to be coming
* from a callback via the interrupt stack.
*/
if (is_task_active(bt->task) && (rip_symbol = closest_symbol(*rip)) &&
(STREQ(rip_symbol, "thread_return") || STREQ(rip_symbol, "schedule"))) {
cpu = bt->tc->processor;
xrsp = machdep->machspec->stkinfo.ibase[cpu] +
machdep->machspec->stkinfo.isize - sizeof(ulong);
while (readmem(xrsp, KVADDR, &xrip,
sizeof(ulong), "xendump rsp", RETURN_ON_ERROR)) {
if ((sp = value_search(xrip, (ulong *)&offset)) &&
STREQ(sp->name, "smp_really_stop_cpu") && offset) {
*rip = xrip;
*rsp = xrsp;
if (CRASHDEBUG(1))
error(INFO,
"switch thread_return to smp_call_function_interrupt\n");
break;
}
xrsp -= sizeof(ulong);
if (xrsp <= machdep->machspec->stkinfo.ibase[cpu])
break;
}
}
}
/* for XEN Hypervisor analysis */
static int
x86_64_is_kvaddr_hyper(ulong addr)
{
return (addr >= HYPERVISOR_VIRT_START && addr < HYPERVISOR_VIRT_END);
}
static ulong
x86_64_get_stackbase_hyper(ulong task)
{
struct xen_hyper_vcpu_context *vcc;
struct xen_hyper_pcpu_context *pcc;
ulong rsp0, base;
/* task means vcpu here */
vcc = xen_hyper_vcpu_to_vcpu_context(task);
if (!vcc)
error(FATAL, "invalid vcpu\n");
pcc = xen_hyper_id_to_pcpu_context(vcc->processor);
if (!pcc)
error(FATAL, "invalid pcpu number\n");
rsp0 = pcc->sp.rsp0;
base = rsp0 & (~(STACKSIZE() - 1));
return base;
}
static ulong
x86_64_get_stacktop_hyper(ulong task)
{
return x86_64_get_stackbase_hyper(task) + STACKSIZE();
}
#define EXCEPTION_STACKSIZE_HYPER (1024UL)
static ulong
x86_64_in_exception_stack_hyper(ulong vcpu, ulong rsp)
{
struct xen_hyper_vcpu_context *vcc;
struct xen_hyper_pcpu_context *pcc;
int i;
ulong stackbase;
vcc = xen_hyper_vcpu_to_vcpu_context(vcpu);
if (!vcc)
error(FATAL, "invalid vcpu\n");
pcc = xen_hyper_id_to_pcpu_context(vcc->processor);
if (!pcc)
error(FATAL, "invalid pcpu number\n");
for (i = 0; i < XEN_HYPER_TSS_IST_MAX; i++) {
if (pcc->ist[i] == 0) {
continue;
}
stackbase = pcc->ist[i] - EXCEPTION_STACKSIZE_HYPER;
if ((rsp & ~(EXCEPTION_STACKSIZE_HYPER - 1)) == stackbase) {
return stackbase;
}
}
return 0;
}
static void
x86_64_get_stack_frame_hyper(struct bt_info *bt, ulong *pcp, ulong *spp)
{
struct xen_hyper_vcpu_context *vcc;
int pcpu;
ulong *regs;
ulong rsp, rip;
/* task means vcpu here */
vcc = xen_hyper_vcpu_to_vcpu_context(bt->task);
if (!vcc)
error(FATAL, "invalid vcpu\n");
pcpu = vcc->processor;
if (!xen_hyper_test_pcpu_id(pcpu)) {
error(FATAL, "invalid pcpu number\n");
}
if (bt->flags & BT_TEXT_SYMBOLS_ALL) {
if (spp)
*spp = x86_64_get_stackbase_hyper(bt->task);
if (pcp)
*pcp = 0;
bt->flags &= ~BT_TEXT_SYMBOLS_ALL;
return;
}
regs = (ulong *)xen_hyper_id_to_dumpinfo_context(pcpu)->pr_reg_ptr;
rsp = XEN_HYPER_X86_64_NOTE_RSP(regs);
rip = XEN_HYPER_X86_64_NOTE_RIP(regs);
if (spp) {
if (x86_64_in_exception_stack_hyper(bt->task, rsp))
*spp = rsp;
else if (rsp < x86_64_get_stackbase_hyper(bt->task) ||
rsp >= x86_64_get_stacktop_hyper(bt->task))
*spp = x86_64_get_stackbase_hyper(bt->task);
else
*spp = rsp;
}
if (pcp) {
if (is_kernel_text(rip))
*pcp = rip;
else
*pcp = 0;
}
}
static int
x86_64_print_stack_entry_hyper(struct bt_info *bt, FILE *ofp, int level,
int stkindex, ulong text)
{
ulong rsp, offset;
struct syment *sp;
char *name, *name_plus_offset;
int result;
char buf1[BUFSIZE];
char buf2[BUFSIZE];
offset = 0;
sp = value_search(text, &offset);
if (!sp)
return BACKTRACE_ENTRY_IGNORED;
name = sp->name;
if (offset && (bt->flags & BT_SYMBOL_OFFSET))
name_plus_offset = value_to_symstr(text, buf2, bt->radix);
else
name_plus_offset = NULL;
if (STREQ(name, "syscall_enter"))
result = BACKTRACE_COMPLETE;
else
result = BACKTRACE_ENTRY_DISPLAYED;
rsp = bt->stackbase + (stkindex * sizeof(long));
if ((bt->flags & BT_FULL)) {
if (bt->frameptr)
x86_64_display_full_frame(bt, rsp, ofp);
bt->frameptr = rsp + sizeof(ulong);
}
fprintf(ofp, "%s#%d [%8lx] %s at %lx\n", level < 10 ? " " : "", level,
rsp, name_plus_offset ? name_plus_offset : name, text);
if (bt->flags & BT_LINE_NUMBERS) {
get_line_number(text, buf1, FALSE);
if (strlen(buf1))
fprintf(ofp, " %s\n", buf1);
}
if (BT_REFERENCE_CHECK(bt))
x86_64_do_bt_reference_check(bt, text, name);
return result;
}
static void
x86_64_print_eframe_regs_hyper(struct bt_info *bt)
{
ulong *up;
ulong offset;
struct syment *sp;
up = (ulong *)(&bt->stackbuf[bt->stacktop - bt->stackbase]);
up -= 21;
fprintf(fp, " [exception RIP: ");
if ((sp = value_search(up[16], &offset))) {
fprintf(fp, "%s", sp->name);
if (offset)
fprintf(fp, (*gdb_output_radix == 16) ?
"+0x%lx" : "+%ld", offset);
} else
fprintf(fp, "unknown or invalid address");
fprintf(fp, "]\n");
fprintf(fp, " RIP: %016lx RSP: %016lx RFLAGS: %08lx\n",
up[16], up[19], up[18]);
fprintf(fp, " RAX: %016lx RBX: %016lx RCX: %016lx\n",
up[10], up[5], up[11]);
fprintf(fp, " RDX: %016lx RSI: %016lx RDI: %016lx\n",
up[12], up[13], up[14]);
fprintf(fp, " RBP: %016lx R8: %016lx R9: %016lx\n",
up[4], up[9], up[8]);
fprintf(fp, " R10: %016lx R11: %016lx R12: %016lx\n",
up[7], up[6], up[3]);
fprintf(fp, " R13: %016lx R14: %016lx R15: %016lx\n",
up[2], up[1], up[0]);
fprintf(fp, " ORIG_RAX: %016lx CS: %04lx SS: %04lx\n",
up[15], up[17], up[20]);
fprintf(fp, "--- <exception stack> ---\n");
}
/*
* simple back tracer for xen hypervisor
* irq stack does not exist. so relative easy.
*/
static void
x86_64_simple_back_trace_cmd_hyper(struct bt_info *bt_in)
{
int i, level, done;
ulong rsp, estack, stacktop;
ulong *up;
FILE *ofp;
struct bt_info bt_local, *bt;
char ebuf[EXCEPTION_STACKSIZE_HYPER];
bt = &bt_local;
BCOPY(bt_in, bt, sizeof(struct bt_info));
if (bt->flags & BT_FRAMESIZE_DEBUG) {
error(INFO, "-F not support\n");
return;
}
level = 0;
done = FALSE;
bt->call_target = NULL;
rsp = bt->stkptr;
if (!rsp) {
error(INFO, "cannot determine starting stack pointer\n");
return;
}
if (BT_REFERENCE_CHECK(bt))
ofp = pc->nullfp;
else
ofp = fp;
while ((estack = x86_64_in_exception_stack_hyper(bt->task, rsp))) {
bt->flags |= BT_EXCEPTION_STACK;
bt->stackbase = estack;
bt->stacktop = estack + EXCEPTION_STACKSIZE_HYPER;
bt->stackbuf = ebuf;
if (!readmem(bt->stackbase, KVADDR, bt->stackbuf,
bt->stacktop - bt->stackbase, "exception stack contents",
RETURN_ON_ERROR))
error(FATAL, "read of exception stack at %lx failed\n",
bt->stackbase);
stacktop = bt->stacktop - 168;
for (i = (rsp - bt->stackbase)/sizeof(ulong);
!done && (rsp < stacktop); i++, rsp += sizeof(ulong)) {
up = (ulong *)(&bt->stackbuf[i*sizeof(ulong)]);
if (!is_kernel_text(*up))
continue;
switch (x86_64_print_stack_entry_hyper(bt, ofp, level, i,*up))
{
case BACKTRACE_ENTRY_DISPLAYED:
level++;
break;
case BACKTRACE_ENTRY_IGNORED:
break;
case BACKTRACE_COMPLETE:
done = TRUE;
break;
}
}
if (!BT_REFERENCE_CHECK(bt))
x86_64_print_eframe_regs_hyper(bt);
up = (ulong *)(&bt->stackbuf[bt->stacktop - bt->stackbase]);
up -= 2;
rsp = bt->stkptr = *up;
up -= 3;
bt->instptr = *up;
done = FALSE;
bt->frameptr = 0;
}
if (bt->flags & BT_EXCEPTION_STACK) {
bt->flags &= ~BT_EXCEPTION_STACK;
bt->stackbase = bt_in->stackbase;
bt->stacktop = bt_in->stacktop;
bt->stackbuf = bt_in->stackbuf;
}
for (i = (rsp - bt->stackbase)/sizeof(ulong);
!done && (rsp < bt->stacktop); i++, rsp += sizeof(ulong)) {
up = (ulong *)(&bt->stackbuf[i*sizeof(ulong)]);
if (!is_kernel_text(*up))
continue;
switch (x86_64_print_stack_entry_hyper(bt, ofp, level, i,*up))
{
case BACKTRACE_ENTRY_DISPLAYED:
level++;
break;
case BACKTRACE_ENTRY_IGNORED:
break;
case BACKTRACE_COMPLETE:
done = TRUE;
break;
}
}
}
static void
x86_64_init_hyper(int when)
{
switch (when)
{
case PRE_SYMTAB:
machdep->verify_symbol = x86_64_verify_symbol;
machdep->machspec = &x86_64_machine_specific;
if (pc->flags & KERNEL_DEBUG_QUERY)
return;
machdep->pagesize = memory_page_size();
machdep->pageshift = ffs(machdep->pagesize) - 1;
machdep->pageoffset = machdep->pagesize - 1;
machdep->pagemask = ~((ulonglong)machdep->pageoffset);
machdep->stacksize = machdep->pagesize * 2;
if ((machdep->machspec->upml = (char *)malloc(PAGESIZE())) == NULL)
error(FATAL, "cannot malloc upml space.");
if ((machdep->pgd = (char *)malloc(PAGESIZE())) == NULL)
error(FATAL, "cannot malloc pgd space.");
if ((machdep->pmd = (char *)malloc(PAGESIZE())) == NULL)
error(FATAL, "cannot malloc pmd space.");
if ((machdep->ptbl = (char *)malloc(PAGESIZE())) == NULL)
error(FATAL, "cannot malloc ptbl space.");
if ((machdep->machspec->pml4 =
(char *)malloc(PAGESIZE()*2)) == NULL)
error(FATAL, "cannot malloc pml4 space.");
machdep->machspec->last_upml_read = 0;
machdep->machspec->last_pml4_read = 0;
machdep->last_pgd_read = 0;
machdep->last_pmd_read = 0;
machdep->last_ptbl_read = 0;
machdep->verify_paddr = generic_verify_paddr;
machdep->ptrs_per_pgd = PTRS_PER_PGD;
if (machdep->cmdline_args[0])
parse_cmdline_args();
break;
case PRE_GDB:
machdep->machspec->page_offset = PAGE_OFFSET_XEN_HYPER;
machdep->kvbase = (ulong)HYPERVISOR_VIRT_START;
machdep->identity_map_base = (ulong)PAGE_OFFSET_XEN_HYPER;
machdep->is_kvaddr = x86_64_is_kvaddr_hyper;
machdep->is_uvaddr = x86_64_is_uvaddr;
machdep->eframe_search = x86_64_eframe_search;
machdep->back_trace = x86_64_simple_back_trace_cmd_hyper;
machdep->processor_speed = x86_64_processor_speed;
machdep->kvtop = x86_64_kvtop;
machdep->get_task_pgd = x86_64_get_task_pgd;
machdep->get_stack_frame = x86_64_get_stack_frame_hyper;
machdep->get_stackbase = x86_64_get_stackbase_hyper;
machdep->get_stacktop = x86_64_get_stacktop_hyper;
machdep->translate_pte = x86_64_translate_pte;
machdep->memory_size = xen_hyper_x86_memory_size; /* KAK add */
machdep->is_task_addr = x86_64_is_task_addr;
machdep->dis_filter = x86_64_dis_filter;
machdep->cmd_mach = x86_64_cmd_mach;
machdep->get_smp_cpus = xen_hyper_x86_get_smp_cpus; /* KAK add */
machdep->line_number_hooks = x86_64_line_number_hooks;
machdep->value_to_symbol = generic_machdep_value_to_symbol;
machdep->init_kernel_pgd = x86_64_init_kernel_pgd;
machdep->clear_machdep_cache = x86_64_clear_machdep_cache;
/* machdep table for Xen Hypervisor */
xhmachdep->pcpu_init = xen_hyper_x86_pcpu_init;
break;
case POST_GDB:
XEN_HYPER_STRUCT_SIZE_INIT(cpuinfo_x86, "cpuinfo_x86");
XEN_HYPER_STRUCT_SIZE_INIT(tss_struct, "tss_struct");
XEN_HYPER_ASSIGN_OFFSET(tss_struct_rsp0) = MEMBER_OFFSET("tss_struct", "__blh") + sizeof(short unsigned int);
XEN_HYPER_MEMBER_OFFSET_INIT(tss_struct_ist, "tss_struct", "ist");
if (symbol_exists("cpu_data")) {
xht->cpu_data_address = symbol_value("cpu_data");
}
/* KAK Can this be calculated? */
if (!machdep->hz) {
machdep->hz = XEN_HYPER_HZ;
}
break;
case POST_INIT:
break;
}
}
struct framesize_cache {
ulong textaddr;
int framesize;
int exception;
};
static struct framesize_cache *x86_64_framesize_cache = NULL;
static int framesize_cache_entries = 0;
#define FRAMESIZE_QUERY (1)
#define FRAMESIZE_ENTER (2)
#define FRAMESIZE_DUMP (3)
#define FRAMESIZE_CACHE_INCR (50)
static int
x86_64_framesize_cache_resize(void)
{
int i;
struct framesize_cache *new_fc, *fc;
if ((new_fc = realloc(x86_64_framesize_cache,
(framesize_cache_entries+FRAMESIZE_CACHE_INCR) *
sizeof(struct framesize_cache))) == NULL) {
error(INFO, "cannot realloc x86_64_framesize_cache space!\n");
return FALSE;
}
fc = new_fc + framesize_cache_entries;
for (i = framesize_cache_entries;
i < (framesize_cache_entries+FRAMESIZE_CACHE_INCR);
fc++, i++) {
fc->textaddr = 0;
fc->framesize = 0;
fc->exception = 0;
}
x86_64_framesize_cache = new_fc;
framesize_cache_entries += FRAMESIZE_CACHE_INCR;
return TRUE;
}
static int
x86_64_framesize_cache_func(int cmd, ulong textaddr, int *framesize, int exception)
{
int i, n;
struct framesize_cache *fc;
char buf[BUFSIZE];
if (!x86_64_framesize_cache) {
framesize_cache_entries = FRAMESIZE_CACHE_INCR;
if ((x86_64_framesize_cache = calloc(framesize_cache_entries,
sizeof(struct framesize_cache))) == NULL)
error(FATAL,
"cannot calloc x86_64_framesize_cache space!\n");
}
switch (cmd)
{
case FRAMESIZE_QUERY:
fc = &x86_64_framesize_cache[0];
for (i = 0; i < framesize_cache_entries; i++, fc++) {
if (fc->textaddr == textaddr) {
if (fc->exception != exception)
return FALSE;
*framesize = fc->framesize;
return TRUE;
}
}
return FALSE;
case FRAMESIZE_ENTER:
retry:
fc = &x86_64_framesize_cache[0];
for (i = 0; i < framesize_cache_entries; i++, fc++) {
if ((fc->textaddr == 0) ||
(fc->textaddr == textaddr)) {
if (*framesize == -1) {
fc->textaddr = 0;
fc->framesize = 0;
fc->exception = 0;
for (n = i+1; n < framesize_cache_entries;
i++, n++)
x86_64_framesize_cache[i] =
x86_64_framesize_cache[n];
return 0;
}
fc->textaddr = textaddr;
fc->framesize = *framesize;
fc->exception = exception;
return fc->framesize;
}
}
if (x86_64_framesize_cache_resize())
goto retry;
return *framesize;
case FRAMESIZE_DUMP:
fc = &x86_64_framesize_cache[0];
for (i = 0; i < framesize_cache_entries; i++, fc++) {
if (fc->textaddr == 0) {
if (i < (framesize_cache_entries-1)) {
fprintf(fp, "[%d-%d]: (unused)\n",
i, framesize_cache_entries-1);
}
break;
}
fprintf(fp, "[%3d]: %lx %3d %s (%s)\n", i,
fc->textaddr, fc->framesize,
fc->exception ? "EX" : "CF",
value_to_symstr(fc->textaddr, buf, 0));
}
break;
}
return TRUE;
}
ulong
x86_64_get_framepointer(struct bt_info *bt, ulong rsp)
{
ulong stackptr, framepointer, retaddr;
framepointer = 0;
stackptr = rsp - sizeof(ulong);
if (!INSTACK(stackptr, bt))
return 0;
if (!readmem(stackptr, KVADDR, &framepointer,
sizeof(ulong), "framepointer", RETURN_ON_ERROR|QUIET))
return 0;
if (!INSTACK(framepointer, bt))
return 0;
if (framepointer <= (rsp+sizeof(ulong)))
return 0;
if (!readmem(framepointer + sizeof(ulong), KVADDR, &retaddr,
sizeof(ulong), "return address", RETURN_ON_ERROR|QUIET))
return 0;
if (!is_kernel_text(retaddr))
return 0;
return framepointer;
}
int
search_for_eframe_target_caller(struct bt_info *bt, ulong stkptr, int *framesize)
{
int i;
ulong *up, offset, rsp;
struct syment *sp1, *sp2;
char *called_function;
if ((sp1 = value_search(bt->eframe_ip, &offset)))
called_function = sp1->name;
else
return FALSE;
rsp = stkptr;
for (i = (rsp - bt->stackbase)/sizeof(ulong);
rsp < bt->stacktop; i++, rsp += sizeof(ulong)) {
up = (ulong *)(&bt->stackbuf[i*sizeof(ulong)]);
if (!is_kernel_text(*up))
continue;
if (!(sp1 = value_search(*up, &offset)))
continue;
if (!offset && !(bt->flags & BT_FRAMESIZE_DISABLE))
continue;
/*
* Get the syment of the function that the text
* routine above called before leaving its return
* address on the stack -- if it can be determined.
*/
if ((sp2 = x86_64_function_called_by((*up)-5))) {
if (STREQ(sp2->name, called_function)) {
if (CRASHDEBUG(1)) {
fprintf(fp,
"< %lx/%s rsp: %lx caller: %s >\n",
bt->eframe_ip, called_function,
stkptr, sp1->name);
}
*framesize = rsp - stkptr;
return TRUE;
}
}
}
return FALSE;
}
#define BT_FRAMESIZE_IGNORE_MASK \
(BT_OLD_BACK_TRACE|BT_TEXT_SYMBOLS|BT_TEXT_SYMBOLS_ALL|BT_FRAMESIZE_DISABLE)
static int
x86_64_get_framesize(struct bt_info *bt, ulong textaddr, ulong rsp)
{
int c, framesize, instr, arg, max;
struct syment *sp;
long max_instructions;
ulong offset;
char buf[BUFSIZE];
char buf2[BUFSIZE];
char *arglist[MAXARGS];
ulong locking_func, textaddr_save, current, framepointer;
char *p1, *p2;
int reterror;
int arg_exists;
int exception;
if (!(bt->flags & BT_FRAMESIZE_DEBUG)) {
if ((bt->flags & BT_FRAMESIZE_IGNORE_MASK) ||
(kt->flags & USE_OLD_BT))
return 0;
}
if (!(sp = value_search(textaddr, &offset))) {
if (!(bt->flags & BT_FRAMESIZE_DEBUG))
bt->flags |= BT_FRAMESIZE_DISABLE;
return 0;
}
exception = bt->eframe_ip == textaddr ? TRUE : FALSE;
if ((bt->flags & BT_EFRAME_TARGET) &&
search_for_eframe_target_caller(bt, rsp, &framesize))
return framesize;
if (!(bt->flags & BT_FRAMESIZE_DEBUG) &&
x86_64_framesize_cache_func(FRAMESIZE_QUERY, textaddr, &framesize,
exception)) {
if (framesize == -1)
bt->flags |= BT_FRAMESIZE_DISABLE;
return framesize;
}
/*
* Bait and switch an incoming .text.lock address
* with the containing function's address.
*/
if (STRNEQ(sp->name, ".text.lock.") &&
(locking_func = text_lock_function(sp->name, bt, textaddr))) {
if (!(sp = value_search(locking_func, &offset))) {
bt->flags |= BT_FRAMESIZE_DISABLE;
return 0;
}
textaddr_save = textaddr;
textaddr = locking_func;
} else
textaddr_save = 0;
/*
* As of 2.6.29, "irq_entries_start" replaced the range of IRQ
* entry points named IRQ0x00_interrupt through IRQ0x##_interrupt.
* Each IRQ entry point in the list of non-symbolically-named
* entry stubs consists of a single pushq and a jmp.
*/
if (STREQ(sp->name, "irq_entries_start")) {
#define PUSH_IMM8 0x6a
if (readmem(textaddr, KVADDR, &instr,
sizeof(short), "irq_entries_start instruction",
QUIET|RETURN_ON_ERROR) &&
((instr & 0xff) == PUSH_IMM8))
framesize = 0;
else
framesize = 8;
return (x86_64_framesize_cache_func(FRAMESIZE_ENTER, textaddr,
&framesize, exception));
}
if ((machdep->flags & FRAMEPOINTER) &&
rsp && !exception && !textaddr_save) {
framepointer = x86_64_get_framepointer(bt, rsp);
if (CRASHDEBUG(3)) {
if (framepointer)
fprintf(fp,
" rsp: %lx framepointer: %lx -> %ld\n",
rsp, framepointer, framepointer - rsp);
else
fprintf(fp,
" rsp: %lx framepointer: (unknown)\n", rsp);
}
if (framepointer) {
framesize = framepointer - rsp;
return (x86_64_framesize_cache_func(FRAMESIZE_ENTER,
textaddr, &framesize, 0));
}
}
if ((sp->value >= kt->init_begin) && (sp->value < kt->init_end))
return 0;
framesize = max = 0;
max_instructions = textaddr - sp->value;
instr = arg = -1;
open_tmpfile2();
sprintf(buf, "x/%ldi 0x%lx",
max_instructions, sp->value);
if (!gdb_pass_through(buf, pc->tmpfile2, GNU_RETURN_ON_ERROR)) {
close_tmpfile2();
bt->flags |= BT_FRAMESIZE_DISABLE;
return 0;
}
rewind(pc->tmpfile2);
while (fgets(buf, BUFSIZE, pc->tmpfile2)) {
strcpy(buf2, buf);
if (CRASHDEBUG(3))
fprintf(fp, "%s", buf2);
c = parse_line(buf, arglist);
if (instr == -1) {
/*
* Check whether <function+offset> are
* in the output string.
*/
if (LASTCHAR(arglist[0]) == ':') {
instr = 1;
arg = 2;
} else {
instr = 2;
arg = 3;
}
}
if (c < (instr+1))
continue;
else if (c >= (arg+1))
arg_exists = TRUE;
else
arg_exists = FALSE;
reterror = 0;
current = htol(strip_ending_char(arglist[0], ':'),
RETURN_ON_ERROR, &reterror);
if (reterror)
continue;
if (current > textaddr)
break;
else if ((current == textaddr) && !exception)
break;
if (STRNEQ(arglist[instr], "push")) {
framesize += 8;
if (CRASHDEBUG(2) || (bt->flags & BT_FRAMESIZE_DEBUG))
fprintf(fp, "%s\t[framesize: %d]\n",
strip_linefeeds(buf2), framesize);
max = framesize;
} else if (STRNEQ(arglist[instr], "pop") ||
STRNEQ(arglist[instr], "leaveq")) {
if (framesize > 0)
framesize -= 8;
if (CRASHDEBUG(2) || (bt->flags & BT_FRAMESIZE_DEBUG))
fprintf(fp, "%s\t[framesize: %d]\n",
strip_linefeeds(buf2), framesize);
} else if (arg_exists && STRNEQ(arglist[instr], "add") &&
(p1 = strstr(arglist[arg], ",%rsp"))) {
*p1 = NULLCHAR;
p2 = arglist[arg];
reterror = 0;
offset = htol(p2+1, RETURN_ON_ERROR, &reterror);
if (reterror)
continue;
if (framesize > 0)
framesize -= offset;
if (CRASHDEBUG(2) || (bt->flags & BT_FRAMESIZE_DEBUG))
fprintf(fp, "%s\t[framesize: %d]\n",
strip_linefeeds(buf2), framesize);
} else if (arg_exists && STRNEQ(arglist[instr], "sub") &&
(p1 = strstr(arglist[arg], ",%rsp"))) {
*p1 = NULLCHAR;
p2 = arglist[arg];
reterror = 0;
offset = htol(p2+1, RETURN_ON_ERROR, &reterror);
if (reterror)
continue;
framesize += offset;
max = framesize;
if (CRASHDEBUG(2) || (bt->flags & BT_FRAMESIZE_DEBUG))
fprintf(fp, "%s\t[framesize: %d]\n",
strip_linefeeds(buf2), framesize);
} else if (STRNEQ(arglist[instr], "retq")) {
if (!exception) {
framesize = max;
if (CRASHDEBUG(2) || (bt->flags & BT_FRAMESIZE_DEBUG))
fprintf(fp, "%s\t[framesize restored to: %d]\n",
strip_linefeeds(buf2), max);
}
} else if (STRNEQ(arglist[instr], "retq_NOT_CHECKED")) {
bt->flags |= BT_FRAMESIZE_DISABLE;
framesize = -1;
if (CRASHDEBUG(2) || (bt->flags & BT_FRAMESIZE_DEBUG))
fprintf(fp, "%s\t[framesize: DISABLED]\n",
strip_linefeeds(buf2));
break;
}
}
close_tmpfile2();
if (textaddr_save)
textaddr = textaddr_save;
return (x86_64_framesize_cache_func(FRAMESIZE_ENTER, textaddr,
&framesize, exception));
}
static void
x86_64_framesize_debug(struct bt_info *bt)
{
int framesize;
int exception;
exception = (bt->flags & BT_EFRAME_SEARCH);
switch (bt->hp->esp)
{
case 1: /* "dump" */
x86_64_framesize_cache_func(FRAMESIZE_DUMP, 0, NULL, 0);
break;
case 0:
if (bt->hp->eip) { /* clear one entry */
framesize = -1;
x86_64_framesize_cache_func(FRAMESIZE_ENTER, bt->hp->eip,
&framesize, exception);
} else { /* clear all entries */
BZERO(&x86_64_framesize_cache[0],
sizeof(struct framesize_cache)*framesize_cache_entries);
fprintf(fp, "framesize cache cleared\n");
}
break;
case -1:
if (!bt->hp->eip)
error(INFO, "x86_64_framesize_debug: ignoring command\n");
else
x86_64_get_framesize(bt, bt->hp->eip, 0);
break;
case -3:
machdep->flags |= FRAMEPOINTER;
BZERO(&x86_64_framesize_cache[0],
sizeof(struct framesize_cache)*framesize_cache_entries);
fprintf(fp,
"framesize cache cleared and FRAMEPOINTER turned ON\n");
break;
case -4:
machdep->flags &= ~FRAMEPOINTER;
BZERO(&x86_64_framesize_cache[0],
sizeof(struct framesize_cache)*framesize_cache_entries);
fprintf(fp,
"framesize cache cleared and FRAMEPOINTER turned OFF\n");
break;
default:
if (bt->hp->esp > 1) {
framesize = bt->hp->esp;
if (bt->hp->eip)
x86_64_framesize_cache_func(FRAMESIZE_ENTER, bt->hp->eip,
&framesize, exception);
} else
error(INFO, "x86_64_framesize_debug: ignoring command\n");
break;
}
}
/*
* The __schedule() framesize should only have to be calculated
* one time, but always verify that the previously-determined
* framesize applies to this task, and if it doesn't, recalculate.
* Update the bt->instptr here, and return the new stack pointer.
*/
static ulong
__schedule_frame_adjust(ulong rsp_in, struct bt_info *bt)
{
int i, found;
ulong rsp, *up;
struct syment *sp;
int framesize;
if (!INSTACK(rsp_in, bt))
error(FATAL,
"invalid RSP: %lx bt->stackbase/stacktop: %lx/%lx cpu: %d\n",
rsp_in, bt->stackbase, bt->stacktop, bt->tc->processor);
if (x86_64_framesize_cache_func(FRAMESIZE_QUERY,
machdep->machspec->thread_return, &framesize, 0)) {
rsp = rsp_in + framesize;
i = (rsp - bt->stackbase)/sizeof(ulong);
up = (ulong *)(&bt->stackbuf[i*sizeof(ulong)]);
if (is_kernel_text_offset(*up) &&
(sp = x86_64_function_called_by((*up)-5)) &&
STREQ(sp->name, "__schedule")) {
bt->instptr = *up;
return (rsp);
}
}
rsp = rsp_in;
for (found = FALSE, i = (rsp - bt->stackbase)/sizeof(ulong);
rsp < bt->stacktop; i++, rsp += sizeof(ulong)) {
up = (ulong *)(&bt->stackbuf[i*sizeof(ulong)]);
if (!is_kernel_text_offset(*up))
continue;
if ((sp = x86_64_function_called_by((*up)-5)) &&
(STREQ(sp->name, "__schedule"))) {
framesize = (int)(rsp - rsp_in);
bt->instptr = *up;
x86_64_framesize_cache_func(FRAMESIZE_ENTER,
machdep->machspec->thread_return,
&framesize, 0);
bt->instptr = *up;
found = TRUE;
break;
}
}
if (CRASHDEBUG(1) && !found)
error(INFO, "cannot determine __schedule() caller\n");
return (found ? rsp : rsp_in);
}
static void
x86_64_get_active_set(void)
{
int c;
ulong current;
struct task_context *actctx, *curctx;
struct machine_specific *ms;
if (ACTIVE())
return;
ms = machdep->machspec;
if (!ms->current)
return;
if (CRASHDEBUG(1))
fprintf(fp, "x86_64_get_active_set: runqueue vs. %s\n",
VALID_STRUCT(x8664_pda) ? "x8664_pda" : "current_task");
for (c = 0; c < kt->cpus; c++) {
if (!tt->active_set[c])
continue;
current = ms->current[c];
curctx = task_to_context(current);
actctx = task_to_context(tt->active_set[c]);
if (CRASHDEBUG(1))
fprintf(fp, " [%d]: %016lx %016lx %s%s\n",
c, tt->active_set[c], current,
curctx ? "" : "(invalid task)",
curctx && (curctx->processor != c) ?
"(wrong processor)" : "");
if (!curctx || (curctx->processor != c))
continue;
if (tt->active_set[c] == current)
continue;
if (tt->active_set[c] == tt->panic_task)
continue;
if (stkptr_to_task(ms->crash_nmi_rsp[c]) == curctx->task)
tt->active_set[c] = tt->panic_threads[c] = current;
error(INFO,
"inconsistent active task indications for CPU %d:\n", c);
error(CONT,
" %srunqueue: %lx \"%s\" (default)\n",
VALID_STRUCT(x8664_pda) ? "" : " ",
actctx->task, actctx->comm);
error(CONT,
"%s: %lx \"%s\" %s\n%s",
VALID_STRUCT(x8664_pda) ? " x8664_pda" : "current_task",
current, curctx->comm,
tt->active_set[c] == current ? "(reassigned)" : "",
CRASHDEBUG(1) ? "" : "\n");
}
}
static int
compare_kvaddr(const void *v1, const void *v2)
{
struct vaddr_range *r1, *r2;
r1 = (struct vaddr_range *)v1;
r2 = (struct vaddr_range *)v2;
return (r1->start < r2->start ? -1 :
r1->start == r2->start ? 0 : 1);
}
/*
* Populate the vaddr_range array with a sorted list of
* kernel virtual address ranges. The caller is responsible
* for ensuring that the array is large enough, so it should
* first call this function with a NULL vaddr_range pointer,
* which will return the count of kernel virtual address
* space ranges.
*/
static int
x86_64_get_kvaddr_ranges(struct vaddr_range *vrp)
{
int cnt;
ulong start;
cnt = 0;
vrp[cnt].type = KVADDR_UNITY_MAP;
vrp[cnt].start = machdep->machspec->page_offset;
vrp[cnt++].end = vt->high_memory;
vrp[cnt].type = KVADDR_START_MAP;
vrp[cnt].start = __START_KERNEL_map;
vrp[cnt++].end = kt->end;
vrp[cnt].type = KVADDR_VMALLOC;
vrp[cnt].start = machdep->machspec->vmalloc_start_addr;
vrp[cnt++].end = last_vmalloc_address();
/*
* Verify that these two regions stand alone.
*/
if (st->mods_installed) {
start = lowest_module_address();
if (!in_vmlist_segment(start)) {
vrp[cnt].type = KVADDR_MODULES;
vrp[cnt].start = start;
vrp[cnt++].end = roundup(highest_module_address(),
PAGESIZE());
}
}
if (machdep->flags & VMEMMAP) {
start = machdep->machspec->vmemmap_vaddr;
if (!in_vmlist_segment(start)) {
vrp[cnt].type = KVADDR_VMEMMAP;
vrp[cnt].start = start;
vrp[cnt++].end = vt->node_table[vt->numnodes-1].mem_map +
(vt->node_table[vt->numnodes-1].size * SIZE(page));
}
}
qsort(vrp, cnt, sizeof(struct vaddr_range), compare_kvaddr);
return cnt;
}
/*
* Determine the physical memory range reserved for GART.
*/
static void
GART_init(void)
{
char resource[BUFSIZE];
struct syment *sp;
struct machine_specific *ms;
if (!(sp = kernel_symbol_search("gart_resource")))
return;
STRUCT_SIZE_INIT(resource, "resource");
MEMBER_OFFSET_INIT(resource_start, "resource", "start");
MEMBER_OFFSET_INIT(resource_end, "resource", "end");
if (VALID_STRUCT(resource) &&
VALID_MEMBER(resource_start) &&
VALID_MEMBER(resource_end)) {
if (!readmem(sp->value, KVADDR, resource,
SIZE(resource), "GART resource", RETURN_ON_ERROR))
return;
ms = machdep->machspec;
ms->GART_start = ULONG(resource + OFFSET(resource_start));
ms->GART_end = ULONG(resource + OFFSET(resource_end));
if (ms->GART_start && ms->GART_end) {
machdep->flags |= GART_REGION;
if (CRASHDEBUG(1))
fprintf(fp, "GART address range: %lx - %lx\n",
ms->GART_start, ms->GART_end);
}
}
}
static int
x86_64_verify_paddr(uint64_t paddr)
{
struct machine_specific *ms;
if (machdep->flags & GART_REGION) {
ms = machdep->machspec;
if (ms->GART_start && ms->GART_end &&
(paddr >= ms->GART_start) &&
(paddr <= ms->GART_end))
return FALSE;
}
return TRUE;
}
#endif /* X86_64 */
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