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crash/unwind.c

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/*
* Copyright (C) 1999-2002 Hewlett-Packard Co
* David Mosberger-Tang <davidm@hpl.hp.com>
*/
/*
* unwind.c
*
* Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2012 David Anderson
* Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2012 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.
*
* Adapted from:
*
* arch/ia64/kernel/unwind.c (kernel-2.4.18-6.23)
*/
#ifdef IA64
/*
* WARNING: unw_frame_info, pt_regs and switch_stack have been
* copied to unwind.h, under the UNWIND_V[123] sections; this is
* done to rectify the need for this user-land code to use the same
* data structures that the target kernel is using.
*
* Basically it's a juggling match to keep the unw_frame_info,
* switch_stack and pt_regs structures in a "known" state -- as defined by
* the UNWIND_V[123] definitions used in the unwind.h header file -- and
* then passed to the 3 compile lines of unwind.c to create the three
* unwind_v[123].o object files.
*/
/*
* 2004-09-14 J. Nomura Added OS_INIT handling
*/
/* #include <asm/ptrace.h> can't include this -- it's changing over time! */
#include "defs.h"
#include "xen_hyper_defs.h"
typedef unsigned char u8;
typedef unsigned long long u64;
#undef PAGE_SIZE
#define PAGE_SIZE PAGESIZE()
#define GATE_ADDR (0xa000000000000000 + PAGE_SIZE)
#define CLEAR_SCRIPT_CACHE (TRUE)
#define _ASM_IA64_FPU_H
#include "unwind.h"
#include "unwind_i.h"
#include "rse.h"
static struct unw_reg_state *alloc_reg_state(void);
static void free_reg_state(struct unw_reg_state *);
static void rse_function_params(struct bt_info *bt, struct unw_frame_info *, char *);
static int load_unw_table(int);
static void verify_unw_member(char *, long);
static void verify_common_struct(char *, long);
static void dump_unwind_table(struct unw_table *);
static int unw_init_from_blocked_task(struct unw_frame_info *,
struct bt_info *);
static void unw_init_from_interruption(struct unw_frame_info *,
struct bt_info *, ulong, ulong);
static int unw_switch_from_osinit_v1(struct unw_frame_info *,
struct bt_info *);
static int unw_switch_from_osinit_v2(struct unw_frame_info *,
struct bt_info *);
static int unw_switch_from_osinit_v3(struct unw_frame_info *,
struct bt_info *, char *);
static unsigned long get_init_stack_ulong(unsigned long addr);
static void unw_init_frame_info(struct unw_frame_info *,
struct bt_info *, ulong);
static int find_save_locs(struct unw_frame_info *);
static int unw_unwind(struct unw_frame_info *);
static void run_script(struct unw_script *, struct unw_frame_info *);
static struct unw_script *script_lookup(struct unw_frame_info *);
static struct unw_script *script_new(unsigned long);
static void script_finalize(struct unw_script *, struct unw_state_record *);
static void script_emit(struct unw_script *, struct unw_insn);
static void emit_nat_info(struct unw_state_record *, int, struct unw_script *);
static struct unw_script *build_script(struct unw_frame_info *);
static struct unw_table_entry *lookup(struct unw_table *, unsigned long);
static void compile_reg(struct unw_state_record *, int, struct unw_script *);
static void compile_reg_v2(struct unw_state_record *, int, struct unw_script *);
#define UNW_LOG_CACHE_SIZE 7 /* each unw_script is ~256 bytes in size */
#define UNW_CACHE_SIZE (1 << UNW_LOG_CACHE_SIZE)
#define UNW_LOG_HASH_SIZE (UNW_LOG_CACHE_SIZE + 1)
#define UNW_HASH_SIZE (1 << UNW_LOG_HASH_SIZE)
#define UNW_DEBUG 0
#define UNW_STATS 0
#define p5 5
#define pNonSys p5 /* complement of pSys */
# define STAT(x...)
#define struct_offset(str,fld) ((char *)&((str *)NULL)->fld - (char *) 0)
#undef offsetof
#define offsetof(TYPE, MEMBER) ((size_t) &((TYPE *)0)->MEMBER)
/*
* Local snapshot of kernel's "unw" table, minus the spinlock_t and anything
* after the kernel_table. This allows the unmodified porting of the kernel
* code pieces that reference "unw.xxx" directly.
*
* The 2.6 kernel introduced a new pt_regs_offsets[32] array positioned in
* between the preg_index array and the kernel_table members.
*/
#ifdef REDHAT
static struct unw {
#else
static struct {
spinlock_t lock; /* spinlock for unwind data */
#endif /* !REDHAT */
/* list of unwind tables (one per load-module) */
struct unw_table *tables;
/* table of registers that prologues can save
(and order in which they're saved): */
unsigned char save_order[8];
/* maps a preserved register index (preg_index) to corresponding
switch_stack offset: */
unsigned short sw_off[sizeof(struct unw_frame_info) / 8];
unsigned short lru_head; /* index of lead-recently used script */
unsigned short lru_tail; /* index of most-recently used script */
/* index into unw_frame_info for preserved register i */
unsigned short preg_index[UNW_NUM_REGS];
/* unwind table for the kernel: */
struct unw_table kernel_table;
#ifndef REDHAT
/* unwind table describing the gate page (kernel code that is mapped
into user space): */
size_t gate_table_size;
unsigned long *gate_table;
/* hash table that maps instruction pointer to script index: */
unsigned short hash[UNW_HASH_SIZE];
/* script cache: */
struct unw_script cache[UNW_CACHE_SIZE];
# if UNW_DEBUG
const char *preg_name[UNW_NUM_REGS];
# endif
# if UNW_STATS
struct {
struct {
int lookups;
int hinted_hits;
int normal_hits;
int collision_chain_traversals;
} cache;
struct {
unsigned long build_time;
unsigned long run_time;
unsigned long parse_time;
int builds;
int news;
int collisions;
int runs;
} script;
struct {
unsigned long init_time;
unsigned long unwind_time;
int inits;
int unwinds;
} api;
} stat;
# endif
#endif /* !REDHAT */
} unw = { 0 };
static short pt_regs_offsets[32] = { 0 };
static struct unw_reg_state *
alloc_reg_state(void)
{
return((struct unw_reg_state *) GETBUF(sizeof(struct unw_reg_state)));
}
static void
free_reg_state(struct unw_reg_state *rs)
{
FREEBUF(rs);
}
static struct unw_labeled_state *
alloc_labeled_state(void)
{
return((struct unw_labeled_state *)
GETBUF(sizeof(struct unw_labeled_state)));
}
static void
free_labeled_state(struct unw_labeled_state *ls)
{
FREEBUF(ls);
}
typedef unsigned long unw_word;
/* Unwind accessors. */
static inline unsigned long
pt_regs_off_v2 (unsigned long reg)
{
short off = -1;
if (reg < 32)
off = pt_regs_offsets[reg];
if (off < 0) {
if (reg > 0)
error(INFO, "unwind: bad scratch reg r%lu\n", reg);
off = 0;
}
return (unsigned long) off;
}
/*
* Returns offset of rREG in struct pt_regs.
*/
static inline unsigned long
pt_regs_off (unsigned long reg)
{
unsigned long off =0;
if (machdep->flags & UNW_PTREGS)
return pt_regs_off_v2(reg);
if (reg >= 1 && reg <= 3)
off = struct_offset(struct pt_regs, r1) + 8*(reg - 1);
else if (reg <= 11)
off = struct_offset(struct pt_regs, r8) + 8*(reg - 8);
else if (reg <= 15)
off = struct_offset(struct pt_regs, r12) + 8*(reg - 12);
else if (reg <= 31)
off = struct_offset(struct pt_regs, r16) + 8*(reg - 16);
else if (reg > 0)
error(INFO, "unwind: bad scratch reg r%lu\n", reg);
return off;
}
#ifdef UNWIND_V1
static inline struct pt_regs *
get_scratch_regs (struct unw_frame_info *info)
{
struct pt_regs *pt_unused = NULL;
error(INFO, "get_scratch_regs: should not be here!\n");
return pt_unused;
}
#endif
#ifdef UNWIND_V2
static inline struct pt_regs *
get_scratch_regs (struct unw_frame_info *info)
{
if (!info->pt) {
/* This should not happen with valid unwind info. */
error(INFO,
"get_scratch_regs: bad unwind info: resetting info->pt\n");
if (info->flags & UNW_FLAG_INTERRUPT_FRAME)
info->pt = (unsigned long)((struct pt_regs *)
info->psp - 1);
else
info->pt = info->sp - 16;
}
return (struct pt_regs *) info->pt;
}
#endif
#ifdef UNWIND_V3
static inline struct pt_regs *
get_scratch_regs (struct unw_frame_info *info)
{
if (!info->pt) {
/* This should not happen with valid unwind info. */
error(INFO,
"get_scratch_regs: bad unwind info: resetting info->pt\n");
if (info->flags & UNW_FLAG_INTERRUPT_FRAME)
info->pt = (unsigned long)((struct pt_regs *)
info->psp - 1);
else
info->pt = info->sp - 16;
}
return (struct pt_regs *) info->pt;
}
#endif
int
#ifdef UNWIND_V1
unw_access_gr_v1 (struct unw_frame_info *info, int regnum, unsigned long *val, char *nat, int write)
#endif
#ifdef UNWIND_V2
unw_access_gr_v2 (struct unw_frame_info *info, int regnum, unsigned long *val, char *nat, int write)
#endif
#ifdef UNWIND_V3
unw_access_gr_v3 (struct unw_frame_info *info, int regnum, unsigned long *val, char *nat, int write)
#endif
{
unsigned long *addr, *nat_addr, nat_mask = 0, dummy_nat;
struct unw_ireg *ireg;
struct pt_regs *pt;
struct bt_info *bt = (struct bt_info *)info->task;
if ((unsigned) regnum - 1 >= 127) {
error(INFO, "unwind: trying to access non-existent r%u\n",
regnum);
return -1;
}
if (regnum < 32) {
if (regnum >= 4 && regnum <= 7) {
/* access a preserved register */
ireg = &info->r4 + (regnum - 4);
addr = ireg->loc;
if (addr) {
nat_addr = addr + ireg->nat.off;
switch (ireg->nat.type) {
case UNW_NAT_VAL:
/* simulate getf.sig/setf.sig */
if (write) {
if (*nat) {
/* write NaTVal and be done with it */
addr[0] = 0;
addr[1] = 0x1fffe;
return 0;
}
addr[1] = 0x1003e;
} else {
if (addr[0] == 0 && addr[1] == 0x1ffe) {
/* return NaT and be done with it */
*val = 0;
*nat = 1;
return 0;
}
}
/* fall through */
case UNW_NAT_NONE:
dummy_nat = 0;
nat_addr = &dummy_nat;
break;
case UNW_NAT_MEMSTK:
nat_mask = (1UL << ((long) addr & 0x1f8)/8);
break;
case UNW_NAT_REGSTK:
nat_addr = ia64_rse_rnat_addr(addr);
if ((unsigned long) addr < info->regstk.limit
|| (unsigned long) addr >= info->regstk.top)
{
error(INFO,
"unwind: %p outside of regstk "
"[0x%lx-0x%lx)\n", (void *) addr,
info->regstk.limit,
info->regstk.top);
return -1;
}
if ((unsigned long) nat_addr >= info->regstk.top)
nat_addr = &info->sw->ar_rnat;
nat_mask = (1UL << ia64_rse_slot_num(addr));
break;
}
} else {
addr = &info->sw->r4 + (regnum - 4);
nat_addr = &info->sw->ar_unat;
nat_mask = (1UL << ((long) addr & 0x1f8)/8);
}
} else {
/* access a scratch register */
if (machdep->flags & UNW_PTREGS) {
pt = get_scratch_regs(info);
addr = (unsigned long *) ((unsigned long)pt + pt_regs_off(regnum));
} else {
if (info->flags & UNW_FLAG_INTERRUPT_FRAME)
pt = (struct pt_regs *) info->psp - 1;
else
pt = (struct pt_regs *) info->sp - 1;
addr = (unsigned long *) ((long) pt + pt_regs_off(regnum));
}
if (info->pri_unat_loc)
nat_addr = info->pri_unat_loc;
else
nat_addr = &info->sw->ar_unat;
nat_mask = (1UL << ((long) addr & 0x1f8)/8);
}
} else {
/* access a stacked register */
addr = ia64_rse_skip_regs((unsigned long *) info->bsp, regnum - 32);
nat_addr = ia64_rse_rnat_addr(addr);
if ((unsigned long) addr < info->regstk.limit
|| (unsigned long) addr >= info->regstk.top)
{
error(INFO, "unwind: ignoring attempt to access register outside of rbs\n");
return -1;
}
if ((unsigned long) nat_addr >= info->regstk.top)
nat_addr = &info->sw->ar_rnat;
nat_mask = (1UL << ia64_rse_slot_num(addr));
}
if (write) {
*addr = *val;
if (*nat)
*nat_addr |= nat_mask;
else
*nat_addr &= ~nat_mask;
} else {
if ((IA64_GET_STACK_ULONG(nat_addr) & nat_mask) == 0) {
*val = IA64_GET_STACK_ULONG(addr);
*nat = 0;
} else {
*val = 0; /* if register is a NaT, *addr may contain kernel data! */
*nat = 1;
}
}
return 0;
}
int
#ifdef UNWIND_V1
unw_access_br_v1 (struct unw_frame_info *info, int regnum, unsigned long *val, int write)
#endif
#ifdef UNWIND_V2
unw_access_br_v2 (struct unw_frame_info *info, int regnum, unsigned long *val, int write)
#endif
#ifdef UNWIND_V3
unw_access_br_v3 (struct unw_frame_info *info, int regnum, unsigned long *val, int write)
#endif
{
unsigned long *addr;
struct pt_regs *pt;
struct bt_info *bt = (struct bt_info *)info->task;
if (info->flags & UNW_FLAG_INTERRUPT_FRAME)
pt = (struct pt_regs *) info->psp - 1;
else
pt = (struct pt_regs *) info->sp - 1;
switch (regnum) {
/* scratch: */
case 0: addr = &pt->b0; break;
case 6: addr = &pt->b6; break;
case 7: addr = &pt->b7; break;
/* preserved: */
case 1: case 2: case 3: case 4: case 5:
addr = *(&info->b1_loc + (regnum - 1));
if (!addr)
addr = &info->sw->b1 + (regnum - 1);
break;
default:
error(INFO, "unwind: trying to access non-existent b%u\n",
regnum);
return -1;
}
if (write)
*addr = *val;
else
*val = IA64_GET_STACK_ULONG(addr);
return 0;
}
#ifdef UNWIND_V1
int
unw_access_fr_v1 (struct unw_frame_info *info, int regnum, struct ia64_fpreg *val, int write)
{
struct ia64_fpreg *addr = 0;
struct pt_regs *pt;
struct bt_info *bt = (struct bt_info *)info->task;
if ((unsigned) (regnum - 2) >= 126) {
error(INFO, "unwind: trying to access non-existent f%u\n",
regnum);
return -1;
}
if (info->flags & UNW_FLAG_INTERRUPT_FRAME)
pt = (struct pt_regs *) info->psp - 1;
else
pt = (struct pt_regs *) info->sp - 1;
if (regnum <= 5) {
addr = *(&info->f2_loc + (regnum - 2));
if (!addr)
addr = &info->sw->f2 + (regnum - 2);
} else if (regnum <= 15) {
if (regnum <= 9)
addr = &pt->f6 + (regnum - 6);
else
addr = &info->sw->f10 + (regnum - 10);
} else if (regnum <= 31) {
addr = info->fr_loc[regnum - 16];
if (!addr)
addr = &info->sw->f16 + (regnum - 16);
} else {
#ifdef REDHAT
struct bt_info *bt = (struct bt_info *)info->task;
addr = (struct ia64_fpreg *)
(bt->task + OFFSET(task_struct_thread) +
OFFSET(thread_struct_fph) +
((regnum - 32) * sizeof(struct ia64_fpreg)));
#else
struct task_struct *t = info->task;
if (write)
ia64_sync_fph(t);
else
ia64_flush_fph(t);
addr = t->thread.fph + (regnum - 32);
#endif
}
if (write)
*addr = *val;
else
GET_STACK_DATA(addr, val, sizeof(struct ia64_fpreg));
return 0;
}
#endif
#ifdef UNWIND_V2
int
unw_access_fr_v2 (struct unw_frame_info *info, int regnum, struct ia64_fpreg *val, int write)
{
struct ia64_fpreg *addr = 0;
struct pt_regs *pt;
struct bt_info *bt = (struct bt_info *)info->task;
if ((unsigned) (regnum - 2) >= 126) {
error(INFO, "unwind: trying to access non-existent f%u\n",
regnum);
return -1;
}
if (regnum <= 5) {
addr = *(&info->f2_loc + (regnum - 2));
if (!addr)
addr = &info->sw->f2 + (regnum - 2);
} else if (regnum <= 15) {
if (regnum <= 11) {
pt = get_scratch_regs(info);
addr = &pt->f6 + (regnum - 6);
}
else
addr = &info->sw->f12 + (regnum - 12);
} else if (regnum <= 31) {
addr = info->fr_loc[regnum - 16];
if (!addr)
addr = &info->sw->f16 + (regnum - 16);
} else {
#ifdef REDHAT
struct bt_info *bt = (struct bt_info *)info->task;
addr = (struct ia64_fpreg *)
(bt->task + OFFSET(task_struct_thread) +
OFFSET(thread_struct_fph) +
((regnum - 32) * sizeof(struct ia64_fpreg)));
#else
struct task_struct *t = info->task;
if (write)
ia64_sync_fph(t);
else
ia64_flush_fph(t);
addr = t->thread.fph + (regnum - 32);
#endif
}
if (write)
*addr = *val;
else
GET_STACK_DATA(addr, val, sizeof(struct ia64_fpreg));
return 0;
}
#endif
#ifdef UNWIND_V3
int
unw_access_fr_v3 (struct unw_frame_info *info, int regnum, struct ia64_fpreg *val, int write)
{
struct ia64_fpreg *addr = 0;
struct pt_regs *pt;
struct bt_info *bt = (struct bt_info *)info->task;
if ((unsigned) (regnum - 2) >= 126) {
error(INFO, "unwind: trying to access non-existent f%u\n",
regnum);
return -1;
}
if (regnum <= 5) {
addr = *(&info->f2_loc + (regnum - 2));
if (!addr)
addr = &info->sw->f2 + (regnum - 2);
} else if (regnum <= 15) {
if (regnum <= 11) {
pt = get_scratch_regs(info);
addr = &pt->f6 + (regnum - 6);
}
else
addr = &info->sw->f12 + (regnum - 12);
} else if (regnum <= 31) {
addr = info->fr_loc[regnum - 16];
if (!addr)
addr = &info->sw->f16 + (regnum - 16);
} else {
#ifdef REDHAT
struct bt_info *bt = (struct bt_info *)info->task;
addr = (struct ia64_fpreg *)
(bt->task + OFFSET(task_struct_thread) +
OFFSET(thread_struct_fph) +
((regnum - 32) * sizeof(struct ia64_fpreg)));
#else
struct task_struct *t = info->task;
if (write)
ia64_sync_fph(t);
else
ia64_flush_fph(t);
addr = t->thread.fph + (regnum - 32);
#endif
}
if (write)
*addr = *val;
else
GET_STACK_DATA(addr, val, sizeof(struct ia64_fpreg));
return 0;
}
#endif
int
#ifdef UNWIND_V1
unw_access_ar_v1 (struct unw_frame_info *info, int regnum, unsigned long *val, int write)
#endif
#ifdef UNWIND_V2
unw_access_ar_v2 (struct unw_frame_info *info, int regnum, unsigned long *val, int write)
#endif
#ifdef UNWIND_V3
unw_access_ar_v3 (struct unw_frame_info *info, int regnum, unsigned long *val, int write)
#endif
{
unsigned long *addr;
struct pt_regs *pt;
struct bt_info *bt = (struct bt_info *)info->task;
if (info->flags & UNW_FLAG_INTERRUPT_FRAME)
pt = (struct pt_regs *) info->psp - 1;
else
pt = (struct pt_regs *) info->sp - 1;
switch (regnum) {
case UNW_AR_BSP:
addr = info->bsp_loc;
if (!addr)
addr = &info->sw->ar_bspstore;
break;
case UNW_AR_BSPSTORE:
addr = info->bspstore_loc;
if (!addr)
addr = &info->sw->ar_bspstore;
break;
case UNW_AR_PFS:
addr = info->pfs_loc;
if (!addr)
addr = &info->sw->ar_pfs;
break;
case UNW_AR_RNAT:
addr = info->rnat_loc;
if (!addr)
addr = &info->sw->ar_rnat;
break;
case UNW_AR_UNAT:
addr = info->unat_loc;
if (!addr)
addr = &info->sw->ar_unat;
break;
case UNW_AR_LC:
addr = info->lc_loc;
if (!addr)
addr = &info->sw->ar_lc;
break;
case UNW_AR_EC:
if (!info->cfm_loc)
return -1;
if (write)
*info->cfm_loc =
(*info->cfm_loc & ~(0x3fUL << 52)) | ((*val & 0x3f) << 52);
else
*val = (IA64_GET_STACK_ULONG(info->cfm_loc) >> 52) & 0x3f;
return 0;
case UNW_AR_FPSR:
addr = info->fpsr_loc;
if (!addr)
addr = &info->sw->ar_fpsr;
break;
case UNW_AR_RSC:
if (machdep->flags & UNW_PTREGS)
pt = get_scratch_regs(info);
addr = &pt->ar_rsc;
break;
case UNW_AR_CCV:
if (machdep->flags & UNW_PTREGS)
pt = get_scratch_regs(info);
addr = &pt->ar_ccv;
break;
#if defined(UNWIND_V3)
case UNW_AR_CSD:
if (machdep->flags & UNW_PTREGS)
pt = get_scratch_regs(info);
addr = &pt->ar_csd;
break;
case UNW_AR_SSD:
if (machdep->flags & UNW_PTREGS)
pt = get_scratch_regs(info);
addr = &pt->ar_ssd;
break;
#endif
default:
error(INFO, "unwind: trying to access non-existent ar%u\n",
regnum);
return -1;
}
if (write)
*addr = *val;
else
*val = IA64_GET_STACK_ULONG(addr);
return 0;
}
int
#ifdef UNWIND_V1
unw_access_pr_v1 (struct unw_frame_info *info, unsigned long *val, int write)
#endif
#ifdef UNWIND_V2
unw_access_pr_v2 (struct unw_frame_info *info, unsigned long *val, int write)
#endif
#ifdef UNWIND_V3
unw_access_pr_v3 (struct unw_frame_info *info, unsigned long *val, int write)
#endif
{
unsigned long *addr;
struct bt_info *bt = (struct bt_info *)info->task;
addr = info->pr_loc;
if (!addr)
addr = &info->sw->pr;
if (write)
*addr = *val;
else
*val = IA64_GET_STACK_ULONG(addr);
return 0;
}
/* Routines to manipulate the state stack. */
static inline void
push (struct unw_state_record *sr)
{
struct unw_reg_state *rs;
rs = alloc_reg_state();
if (!rs) {
error(INFO, "unwind: cannot stack reg state!\n");
return;
}
memcpy(rs, &sr->curr, sizeof(*rs));
sr->curr.next = rs;
}
static void
pop (struct unw_state_record *sr)
{
struct unw_reg_state *rs = sr->curr.next;
if (!rs) {
error(INFO, "unwind: stack underflow!\n");
return;
}
memcpy(&sr->curr, rs, sizeof(*rs));
free_reg_state(rs);
}
/* Make a copy of the state stack. Non-recursive to avoid stack overflows. */
static struct unw_reg_state *
dup_state_stack (struct unw_reg_state *rs)
{
struct unw_reg_state *copy, *prev = NULL, *first = NULL;
while (rs) {
copy = alloc_reg_state();
if (!copy) {
error(INFO, "unwind.dup_state_stack: out of memory\n");
return NULL;
}
memcpy(copy, rs, sizeof(*copy));
if (first)
prev->next = copy;
else
first = copy;
rs = rs->next;
prev = copy;
}
return first;
}
/* Free all stacked register states (but not RS itself). */
static void
free_state_stack (struct unw_reg_state *rs)
{
struct unw_reg_state *p, *next;
for (p = rs->next; p != NULL; p = next) {
next = p->next;
free_reg_state(p);
}
rs->next = NULL;
}
/* Routines to manipulate the state stack. */
static enum unw_register_index __attribute__((const))
decode_abreg (unsigned char abreg, int memory)
{
switch (abreg) {
case 0x04 ... 0x07: return UNW_REG_R4 + (abreg - 0x04);
case 0x22 ... 0x25: return UNW_REG_F2 + (abreg - 0x22);
case 0x30 ... 0x3f: return UNW_REG_F16 + (abreg - 0x30);
case 0x41 ... 0x45: return UNW_REG_B1 + (abreg - 0x41);
case 0x60: return UNW_REG_PR;
case 0x61: return UNW_REG_PSP;
case 0x62: return memory ? UNW_REG_PRI_UNAT_MEM : UNW_REG_PRI_UNAT_GR;
case 0x63: return UNW_REG_RP;
case 0x64: return UNW_REG_BSP;
case 0x65: return UNW_REG_BSPSTORE;
case 0x66: return UNW_REG_RNAT;
case 0x67: return UNW_REG_UNAT;
case 0x68: return UNW_REG_FPSR;
case 0x69: return UNW_REG_PFS;
case 0x6a: return UNW_REG_LC;
default:
break;
}
error(INFO, "unwind: bad abreg=0x%x\n", abreg);
return UNW_REG_LC;
}
static void
set_reg (struct unw_reg_info *reg, enum unw_where where, int when, unsigned long val)
{
reg->val = val;
reg->where = where;
if (reg->when == UNW_WHEN_NEVER)
reg->when = when;
}
static void
alloc_spill_area (unsigned long *offp, unsigned long regsize,
struct unw_reg_info *lo, struct unw_reg_info *hi)
{
struct unw_reg_info *reg;
for (reg = hi; reg >= lo; --reg) {
if (reg->where == UNW_WHERE_SPILL_HOME) {
reg->where = UNW_WHERE_PSPREL;
*offp -= regsize;
reg->val = *offp;
#ifndef KERNEL_FIX
reg->val = 0x10 - *offp;
*offp += regsize;
#endif
}
}
}
static inline void
spill_next_when (struct unw_reg_info **regp, struct unw_reg_info *lim, unw_word t)
{
struct unw_reg_info *reg;
for (reg = *regp; reg <= lim; ++reg) {
if (reg->where == UNW_WHERE_SPILL_HOME) {
reg->when = t;
*regp = reg + 1;
return;
}
}
error(INFO, "unwind: excess spill!\n");
}
static inline void
finish_prologue (struct unw_state_record *sr)
{
struct unw_reg_info *reg;
unsigned long off;
int i;
/*
* First, resolve implicit register save locations (see Section "11.4.2.3 Rules
* for Using Unwind Descriptors", rule 3):
*/
for (i = 0; i < (int) sizeof(unw.save_order)/sizeof(unw.save_order[0]); ++i) {
reg = sr->curr.reg + unw.save_order[i];
if (reg->where == UNW_WHERE_GR_SAVE) {
reg->where = UNW_WHERE_GR;
reg->val = sr->gr_save_loc++;
}
}
/*
* Next, compute when the fp, general, and branch registers get
* saved. This must come before alloc_spill_area() because
* we need to know which registers are spilled to their home
* locations.
*/
if (sr->imask) {
unsigned char kind, mask = 0, *cp = sr->imask;
unsigned long t;
static const unsigned char limit[3] = {
UNW_REG_F31, UNW_REG_R7, UNW_REG_B5
};
struct unw_reg_info *(regs[3]);
regs[0] = sr->curr.reg + UNW_REG_F2;
regs[1] = sr->curr.reg + UNW_REG_R4;
regs[2] = sr->curr.reg + UNW_REG_B1;
for (t = 0; t < sr->region_len; ++t) {
if ((t & 3) == 0)
mask = *cp++;
kind = (mask >> 2*(3-(t & 3))) & 3;
if (kind > 0)
spill_next_when(&regs[kind - 1], sr->curr.reg + limit[kind - 1],
sr->region_start + t);
}
}
/*
* Next, lay out the memory stack spill area:
*/
if (sr->any_spills) {
off = sr->spill_offset;
alloc_spill_area(&off, 16, sr->curr.reg + UNW_REG_F2, sr->curr.reg + UNW_REG_F31);
alloc_spill_area(&off, 8, sr->curr.reg + UNW_REG_B1, sr->curr.reg + UNW_REG_B5);
alloc_spill_area(&off, 8, sr->curr.reg + UNW_REG_R4, sr->curr.reg + UNW_REG_R7);
}
}
/*
* Region header descriptors.
*/
static void
desc_prologue (int body, unw_word rlen, unsigned char mask, unsigned char grsave,
struct unw_state_record *sr)
{
int i;
if (!(sr->in_body || sr->first_region))
finish_prologue(sr);
sr->first_region = 0;
/* check if we're done: */
if (sr->when_target < sr->region_start + sr->region_len) {
sr->done = 1;
return;
}
for (i = 0; i < sr->epilogue_count; ++i)
pop(sr);
sr->epilogue_count = 0;
sr->epilogue_start = UNW_WHEN_NEVER;
if (!body)
push(sr);
sr->region_start += sr->region_len;
sr->region_len = rlen;
sr->in_body = body;
if (!body) {
for (i = 0; i < 4; ++i) {
if (mask & 0x8)
set_reg(sr->curr.reg + unw.save_order[i], UNW_WHERE_GR,
sr->region_start + sr->region_len - 1, grsave++);
mask <<= 1;
}
sr->gr_save_loc = grsave;
sr->any_spills = 0;
sr->imask = 0;
sr->spill_offset = 0x10; /* default to psp+16 */
}
}
/*
* Prologue descriptors.
*/
static inline void
desc_abi (unsigned char abi, unsigned char context, struct unw_state_record *sr)
{
console("desc_abi: abi: 0x%x context: %c\n", abi, context);
if (((abi == 0) || (abi == 3)) && context == 'i')
sr->flags |= UNW_FLAG_INTERRUPT_FRAME;
else
error(INFO, "unwind: ignoring unwabi(abi=0x%x,context=0x%x)\n", abi, context);
}
static inline void
desc_br_gr (unsigned char brmask, unsigned char gr, struct unw_state_record *sr)
{
int i;
for (i = 0; i < 5; ++i) {
if (brmask & 1)
set_reg(sr->curr.reg + UNW_REG_B1 + i, UNW_WHERE_GR,
sr->region_start + sr->region_len - 1, gr++);
brmask >>= 1;
}
}
static inline void
desc_br_mem (unsigned char brmask, struct unw_state_record *sr)
{
int i;
for (i = 0; i < 5; ++i) {
if (brmask & 1) {
set_reg(sr->curr.reg + UNW_REG_B1 + i, UNW_WHERE_SPILL_HOME,
sr->region_start + sr->region_len - 1, 0);
sr->any_spills = 1;
}
brmask >>= 1;
}
}
static inline void
desc_frgr_mem (unsigned char grmask, unw_word frmask, struct unw_state_record *sr)
{
int i;
for (i = 0; i < 4; ++i) {
if ((grmask & 1) != 0) {
set_reg(sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_SPILL_HOME,
sr->region_start + sr->region_len - 1, 0);
sr->any_spills = 1;
}
grmask >>= 1;
}
for (i = 0; i < 20; ++i) {
if ((frmask & 1) != 0) {
int base = (i < 4) ? UNW_REG_F2 : UNW_REG_F16 - 4;
set_reg(sr->curr.reg + base + i, UNW_WHERE_SPILL_HOME,
sr->region_start + sr->region_len - 1, 0);
sr->any_spills = 1;
}
frmask >>= 1;
}
#ifndef KERNEL_FIX
for (i = 0; i < 20; ++i) {
if ((frmask & 1) != 0) {
set_reg(sr->curr.reg + UNW_REG_F2 + i, UNW_WHERE_SPILL_HOME,
sr->region_start + sr->region_len - 1, 0);
sr->any_spills = 1;
}
frmask >>= 1;
}
#endif
}
static inline void
desc_fr_mem (unsigned char frmask, struct unw_state_record *sr)
{
int i;
for (i = 0; i < 4; ++i) {
if ((frmask & 1) != 0) {
set_reg(sr->curr.reg + UNW_REG_F2 + i, UNW_WHERE_SPILL_HOME,
sr->region_start + sr->region_len - 1, 0);
sr->any_spills = 1;
}
frmask >>= 1;
}
}
static inline void
desc_gr_gr (unsigned char grmask, unsigned char gr, struct unw_state_record *sr)
{
int i;
for (i = 0; i < 4; ++i) {
if ((grmask & 1) != 0)
set_reg(sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_GR,
sr->region_start + sr->region_len - 1, gr++);
grmask >>= 1;
}
}
static inline void
desc_gr_mem (unsigned char grmask, struct unw_state_record *sr)
{
int i;
for (i = 0; i < 4; ++i) {
if ((grmask & 1) != 0) {
set_reg(sr->curr.reg + UNW_REG_R4 + i, UNW_WHERE_SPILL_HOME,
sr->region_start + sr->region_len - 1, 0);
sr->any_spills = 1;
}
grmask >>= 1;
}
}
static inline void
desc_mem_stack_f (unw_word t, unw_word size, struct unw_state_record *sr)
{
set_reg(sr->curr.reg + UNW_REG_PSP, UNW_WHERE_NONE,
sr->region_start + MIN((int)t, sr->region_len - 1), 16*size);
}
static inline void
desc_mem_stack_v (unw_word t, struct unw_state_record *sr)
{
sr->curr.reg[UNW_REG_PSP].when = sr->region_start + MIN((int)t, sr->region_len - 1);
}
static inline void
desc_reg_gr (unsigned char reg, unsigned char dst, struct unw_state_record *sr)
{
set_reg(sr->curr.reg + reg, UNW_WHERE_GR, sr->region_start + sr->region_len - 1, dst);
}
static inline void
desc_reg_psprel (unsigned char reg, unw_word pspoff, struct unw_state_record *sr)
{
set_reg(sr->curr.reg + reg, UNW_WHERE_PSPREL, sr->region_start + sr->region_len - 1,
0x10 - 4*pspoff);
}
static inline void
desc_reg_sprel (unsigned char reg, unw_word spoff, struct unw_state_record *sr)
{
set_reg(sr->curr.reg + reg, UNW_WHERE_SPREL, sr->region_start + sr->region_len - 1,
4*spoff);
}
static inline void
desc_rp_br (unsigned char dst, struct unw_state_record *sr)
{
sr->return_link_reg = dst;
}
static inline void
desc_reg_when (unsigned char regnum, unw_word t, struct unw_state_record *sr)
{
struct unw_reg_info *reg = sr->curr.reg + regnum;
if (reg->where == UNW_WHERE_NONE)
reg->where = UNW_WHERE_GR_SAVE;
reg->when = sr->region_start + MIN((int)t, sr->region_len - 1);
}
static inline void
desc_spill_base (unw_word pspoff, struct unw_state_record *sr)
{
sr->spill_offset = 0x10 - 4*pspoff;
}
static inline unsigned char *
desc_spill_mask (unsigned char *imaskp, struct unw_state_record *sr)
{
sr->imask = imaskp;
return imaskp + (2*sr->region_len + 7)/8;
}
/*
* Body descriptors.
*/
static inline void
desc_epilogue (unw_word t, unw_word ecount, struct unw_state_record *sr)
{
sr->epilogue_start = sr->region_start + sr->region_len - 1 - t;
sr->epilogue_count = ecount + 1;
}
static inline void
desc_copy_state (unw_word label, struct unw_state_record *sr)
{
struct unw_labeled_state *ls;
for (ls = sr->labeled_states; ls; ls = ls->next) {
if (ls->label == label) {
free_state_stack(&sr->curr);
memcpy(&sr->curr, &ls->saved_state, sizeof(sr->curr));
sr->curr.next = dup_state_stack(ls->saved_state.next);
return;
}
}
error(INFO, "unwind: failed to find state labeled 0x%lx\n", label);
}
static inline void
desc_label_state (unw_word label, struct unw_state_record *sr)
{
struct unw_labeled_state *ls;
ls = alloc_labeled_state();
if (!ls) {
error(INFO, "unwind.desc_label_state(): out of memory\n");
return;
}
ls->label = label;
memcpy(&ls->saved_state, &sr->curr, sizeof(ls->saved_state));
ls->saved_state.next = dup_state_stack(sr->curr.next);
/* insert into list of labeled states: */
ls->next = sr->labeled_states;
sr->labeled_states = ls;
}
/*
* General descriptors.
*/
static inline int
desc_is_active (unsigned char qp, unw_word t, struct unw_state_record *sr)
{
if (sr->when_target <= sr->region_start + MIN((int)t, sr->region_len - 1))
return 0;
if (qp > 0) {
if ((sr->pr_val & (1UL << qp)) == 0)
return 0;
sr->pr_mask |= (1UL << qp);
}
return 1;
}
static inline void
desc_restore_p (unsigned char qp, unw_word t, unsigned char abreg, struct unw_state_record *sr)
{
struct unw_reg_info *r;
if (!desc_is_active(qp, t, sr))
return;
r = sr->curr.reg + decode_abreg(abreg, 0);
r->where = UNW_WHERE_NONE;
r->when = UNW_WHEN_NEVER;
r->val = 0;
}
static inline void
desc_spill_reg_p (unsigned char qp, unw_word t, unsigned char abreg, unsigned char x,
unsigned char ytreg, struct unw_state_record *sr)
{
enum unw_where where = UNW_WHERE_GR;
struct unw_reg_info *r;
if (!desc_is_active(qp, t, sr))
return;
if (x)
where = UNW_WHERE_BR;
else if (ytreg & 0x80)
where = UNW_WHERE_FR;
r = sr->curr.reg + decode_abreg(abreg, 0);
r->where = where;
r->when = sr->region_start + MIN((int)t, sr->region_len - 1);
r->val = (ytreg & 0x7f);
}
static inline void
desc_spill_psprel_p (unsigned char qp, unw_word t, unsigned char abreg, unw_word pspoff,
struct unw_state_record *sr)
{
struct unw_reg_info *r;
if (!desc_is_active(qp, t, sr))
return;
r = sr->curr.reg + decode_abreg(abreg, 1);
r->where = UNW_WHERE_PSPREL;
r->when = sr->region_start + MIN((int)t, sr->region_len - 1);
r->val = 0x10 - 4*pspoff;
}
static inline void
desc_spill_sprel_p (unsigned char qp, unw_word t, unsigned char abreg, unw_word spoff,
struct unw_state_record *sr)
{
struct unw_reg_info *r;
if (!desc_is_active(qp, t, sr))
return;
r = sr->curr.reg + decode_abreg(abreg, 1);
r->where = UNW_WHERE_SPREL;
r->when = sr->region_start + MIN((int)t, sr->region_len - 1);
r->val = 4*spoff;
}
#define UNW_DEC_BAD_CODE(code) error(INFO, "unwind: unknown code 0x%02x\n", code);
/*
* region headers:
*/
#define UNW_DEC_PROLOGUE_GR(fmt,r,m,gr,arg) desc_prologue(0,r,m,gr,arg)
#define UNW_DEC_PROLOGUE(fmt,b,r,arg) desc_prologue(b,r,0,32,arg)
/*
* prologue descriptors:
*/
#define UNW_DEC_ABI(fmt,a,c,arg) desc_abi(a,c,arg)
#define UNW_DEC_BR_GR(fmt,b,g,arg) desc_br_gr(b,g,arg)
#define UNW_DEC_BR_MEM(fmt,b,arg) desc_br_mem(b,arg)
#define UNW_DEC_FRGR_MEM(fmt,g,f,arg) desc_frgr_mem(g,f,arg)
#define UNW_DEC_FR_MEM(fmt,f,arg) desc_fr_mem(f,arg)
#define UNW_DEC_GR_GR(fmt,m,g,arg) desc_gr_gr(m,g,arg)
#define UNW_DEC_GR_MEM(fmt,m,arg) desc_gr_mem(m,arg)
#define UNW_DEC_MEM_STACK_F(fmt,t,s,arg) desc_mem_stack_f(t,s,arg)
#define UNW_DEC_MEM_STACK_V(fmt,t,arg) desc_mem_stack_v(t,arg)
#define UNW_DEC_REG_GR(fmt,r,d,arg) desc_reg_gr(r,d,arg)
#define UNW_DEC_REG_PSPREL(fmt,r,o,arg) desc_reg_psprel(r,o,arg)
#define UNW_DEC_REG_SPREL(fmt,r,o,arg) desc_reg_sprel(r,o,arg)
#define UNW_DEC_REG_WHEN(fmt,r,t,arg) desc_reg_when(r,t,arg)
#define UNW_DEC_PRIUNAT_WHEN_GR(fmt,t,arg) desc_reg_when(UNW_REG_PRI_UNAT_GR,t,arg)
#define UNW_DEC_PRIUNAT_WHEN_MEM(fmt,t,arg) desc_reg_when(UNW_REG_PRI_UNAT_MEM,t,arg)
#define UNW_DEC_PRIUNAT_GR(fmt,r,arg) desc_reg_gr(UNW_REG_PRI_UNAT_GR,r,arg)
#define UNW_DEC_PRIUNAT_PSPREL(fmt,o,arg) desc_reg_psprel(UNW_REG_PRI_UNAT_MEM,o,arg)
#define UNW_DEC_PRIUNAT_SPREL(fmt,o,arg) desc_reg_sprel(UNW_REG_PRI_UNAT_MEM,o,arg)
#define UNW_DEC_RP_BR(fmt,d,arg) desc_rp_br(d,arg)
#define UNW_DEC_SPILL_BASE(fmt,o,arg) desc_spill_base(o,arg)
#define UNW_DEC_SPILL_MASK(fmt,m,arg) (m = desc_spill_mask(m,arg))
/*
* body descriptors:
*/
#define UNW_DEC_EPILOGUE(fmt,t,c,arg) desc_epilogue(t,c,arg)
#define UNW_DEC_COPY_STATE(fmt,l,arg) desc_copy_state(l,arg)
#define UNW_DEC_LABEL_STATE(fmt,l,arg) desc_label_state(l,arg)
/*
* general unwind descriptors:
*/
#define UNW_DEC_SPILL_REG_P(f,p,t,a,x,y,arg) desc_spill_reg_p(p,t,a,x,y,arg)
#define UNW_DEC_SPILL_REG(f,t,a,x,y,arg) desc_spill_reg_p(0,t,a,x,y,arg)
#define UNW_DEC_SPILL_PSPREL_P(f,p,t,a,o,arg) desc_spill_psprel_p(p,t,a,o,arg)
#define UNW_DEC_SPILL_PSPREL(f,t,a,o,arg) desc_spill_psprel_p(0,t,a,o,arg)
#define UNW_DEC_SPILL_SPREL_P(f,p,t,a,o,arg) desc_spill_sprel_p(p,t,a,o,arg)
#define UNW_DEC_SPILL_SPREL(f,t,a,o,arg) desc_spill_sprel_p(0,t,a,o,arg)
#define UNW_DEC_RESTORE_P(f,p,t,a,arg) desc_restore_p(p,t,a,arg)
#define UNW_DEC_RESTORE(f,t,a,arg) desc_restore_p(0,t,a,arg)
#include "unwind_decoder.c"
/*
* Run a sanity check on the common structure usage, and do an initial
* read of the unw table. If anything fails, the UNW_OUT_OF_SYNC flag
* will be set and backtraces not allowed.
*/
void
#ifdef UNWIND_V1
unwind_init_v1(void)
#endif
#ifdef UNWIND_V2
unwind_init_v2(void)
#endif
#ifdef UNWIND_V3
unwind_init_v3(void)
#endif
{
int len;
struct gnu_request request, *req;
req = &request;
if (LKCD_KERNTYPES()) {
if ((len = STRUCT_SIZE("unw")) == 0) {
error(WARNING,
"cannot determine unw.tables offset; no struct unw\n");
machdep->flags |= UNW_OUT_OF_SYNC;
return;
}
machdep->machspec->unw_tables_offset =
MEMBER_OFFSET("unw", "tables");
if (MEMBER_EXISTS("unw", "r0"))
machdep->flags |= UNW_R0;
/*
* no verification of save_order, sw_off, preg_index as
* we're purely depending on the structure definition.
*/
if (MEMBER_EXISTS("unw", "pt_regs_offsets")) {
machdep->machspec->unw_pt_regs_offsets =
MEMBER_OFFSET("unw", "pt_regs_offsets") -
machdep->machspec->unw_tables_offset;
machdep->machspec->unw_kernel_table_offset =
MEMBER_OFFSET("unw", "kernel_table") -
machdep->machspec->unw_tables_offset;
machdep->flags |= UNW_PTREGS;
}
if (!load_unw_table(CLEAR_SCRIPT_CACHE)) {
error(WARNING,
"unwind_init: cannot read kernel unw table\n");
machdep->flags |= UNW_OUT_OF_SYNC;
}
machdep->machspec->unw = (void *)&unw;
/* fall to common structure size verifications */
goto verify;
}
if (get_symbol_type("unw", "tables", req) == TYPE_CODE_UNDEF) {
/*
* KLUDGE ALERT:
* If unw.tables cannot be ascertained by gdb, try unw.save_order,
* given that it is the field just after unw.tables.
*/
if (get_symbol_type("unw", "save_order", req) == TYPE_CODE_UNDEF) {
error(WARNING, "cannot determine unw.tables offset\n");
machdep->flags |= UNW_OUT_OF_SYNC;
} else
req->member_offset -= BITS_PER_BYTE * sizeof(void *);
if (CRASHDEBUG(1))
error(WARNING, "using unw.save_order to determine unw.tables\n");
}
if (!(machdep->flags & UNW_OUT_OF_SYNC)) {
machdep->machspec->unw_tables_offset =
req->member_offset/BITS_PER_BYTE;
if (get_symbol_type("unw", "r0", req) != TYPE_CODE_UNDEF)
machdep->flags |= UNW_R0;
verify_unw_member("save_order",
struct_offset(struct unw, save_order));
verify_unw_member("sw_off", struct_offset(struct unw, sw_off));
verify_unw_member("preg_index",
struct_offset(struct unw, preg_index));
if (get_symbol_type("unw", "pt_regs_offsets", req)
== TYPE_CODE_ARRAY) {
machdep->machspec->unw_pt_regs_offsets =
req->member_offset/BITS_PER_BYTE -
machdep->machspec->unw_tables_offset;
get_symbol_type("unw", "kernel_table", req);
machdep->machspec->unw_kernel_table_offset =
req->member_offset/BITS_PER_BYTE -
machdep->machspec->unw_tables_offset;
machdep->flags |= UNW_PTREGS;
} else
verify_unw_member("kernel_table",
struct_offset(struct unw, kernel_table));
if (!load_unw_table(CLEAR_SCRIPT_CACHE)) {
error(WARNING, "unwind_init: cannot read kernel unw table\n");
machdep->flags |= UNW_OUT_OF_SYNC;
}
machdep->machspec->unw = (void *)&unw;
}
verify:
verify_common_struct("unw_frame_info", sizeof(struct unw_frame_info));
verify_common_struct("unw_table", sizeof(struct unw_table));
verify_common_struct("unw_table_entry", sizeof(struct unw_table_entry));
verify_common_struct("unw_state_record",
sizeof(struct unw_state_record));
verify_common_struct("unw_labeled_state",
sizeof(struct unw_labeled_state));
verify_common_struct("unw_reg_info", sizeof(struct unw_reg_info));
verify_common_struct("unw_insn", sizeof(struct unw_insn));
}
/*
* Check whether the unw fields used in this port exist at the same
* offset as the local version of the structure.
*/
static void
verify_unw_member(char *member, long loffs)
{
struct gnu_request request, *req;
long koffs;
req = &request;
if (get_symbol_type("unw", member, req) == TYPE_CODE_UNDEF) {
error(WARNING, "cannot determine unw.%s offset\n", member);
machdep->flags |= UNW_OUT_OF_SYNC;
} else {
koffs = (req->member_offset/BITS_PER_BYTE) -
machdep->machspec->unw_tables_offset;
if (machdep->flags & UNW_R0)
koffs -= sizeof(unsigned long);
if (koffs != loffs) {
error(WARNING,
"unw.%s offset differs: %ld (local: %d)\n",
member, koffs, loffs);
machdep->flags |= UNW_OUT_OF_SYNC;
} else if (CRASHDEBUG(3))
error(INFO,
"unw.%s offset OK: %ld (local: %d)\n",
member, koffs, loffs);
}
}
/*
* Check whether the sizes of common local/kernel structures match.
*/
static void
verify_common_struct(char *structname, long loclen)
{
long len;
len = STRUCT_SIZE(structname);
if (len < 0) {
error(WARNING, "cannot determine size of %s\n", structname);
machdep->flags |= UNW_OUT_OF_SYNC;
} else if (len != loclen) {
error(WARNING, "%s size differs: %ld (local: %d)\n",
structname, len, loclen);
machdep->flags |= UNW_OUT_OF_SYNC;
}
}
/*
* Do a one-time read of the useful part of the kernel's unw table into the
* truncated local version, followed by a one-time read of the kernel's
* unw_table_entry array into a permanently allocated location. The
* script cache is cleared only if requested.
*/
static int
load_unw_table(int clear_cache)
{
int i;
size_t len;
struct machine_specific *ms;
struct unw_table_entry *kernel_unw_table_entry_array;
if (machdep->flags & UNW_OUT_OF_SYNC)
return FALSE;
ms = machdep->machspec;
if (clear_cache) {
if (!ms->script_cache) {
len = sizeof(struct unw_script) * UNW_CACHE_SIZE;
if ((ms->script_cache =
(struct unw_script *)malloc(len)) == NULL) {
error(WARNING,
"cannot malloc unw_script cache\n");
return FALSE;
}
}
for (i = 0; i < UNW_CACHE_SIZE; i++)
BZERO((void *)&ms->script_cache[i],
sizeof(struct unw_script));
ms->script_index = 0;
}
if (machdep->flags & UNW_READ)
return TRUE;
if (machdep->flags & UNW_R0) {
struct unw *unw_temp, *up;
unw_temp = (struct unw *)GETBUF(sizeof(struct unw) * 2);
up = unw_temp;
if (!readmem(symbol_value("unw")+ms->unw_tables_offset,
KVADDR, up,
sizeof(struct unw) + sizeof(struct unw_table *),
"unw", RETURN_ON_ERROR|QUIET))
return FALSE;
unw.tables = up->tables;
/*
* Bump the "up" pointer by 8 to account for the
* "r0" member that comes after the "tables" member.
*/
up = (struct unw *)(((unsigned long)unw_temp) +
sizeof(struct unw_table *));
for (i = 0; i < 8; i++)
unw.save_order[i] = up->save_order[i];
for (i = 0; i < (sizeof(struct unw_frame_info) / 8); i++)
unw.sw_off[i] = up->sw_off[i];
unw.lru_head = up->lru_head;
unw.lru_tail = up->lru_tail;
for (i = 0; i < UNW_NUM_REGS; i++)
unw.preg_index[i] = up->preg_index[i];
BCOPY(&up->kernel_table, &unw.kernel_table,
sizeof(struct unw_table));
FREEBUF(unw_temp);
} else {
if (!readmem(symbol_value("unw")+ms->unw_tables_offset,
KVADDR, &unw, sizeof(struct unw), "unw", RETURN_ON_ERROR|QUIET))
return FALSE;
}
if (machdep->flags & UNW_PTREGS) {
if (!readmem(symbol_value("unw")+ms->unw_kernel_table_offset+
machdep->machspec->unw_tables_offset,
KVADDR, &unw.kernel_table, sizeof(struct unw_table),
"unw.kernel_table", RETURN_ON_ERROR|QUIET))
return FALSE;
if (!readmem(symbol_value("unw")+ms->unw_pt_regs_offsets+
machdep->machspec->unw_tables_offset,
KVADDR, &pt_regs_offsets, sizeof(pt_regs_offsets),
"unw.pt_regs_offsets", RETURN_ON_ERROR|QUIET))
return FALSE;
}
len = unw.kernel_table.length * sizeof(struct unw_table_entry);
if ((kernel_unw_table_entry_array =
(struct unw_table_entry *)malloc(len)) == NULL) {
error(WARNING,
"cannot malloc kernel unw.kernel_table array (len: %d)\n",
len);
return FALSE;
}
if (!readmem((ulong)unw.kernel_table.array,
KVADDR, kernel_unw_table_entry_array, len,
"kernel unw_table_entry array", RETURN_ON_ERROR|QUIET)) {
error(WARNING, "cannot read kernel unw.kernel_table array\n");
return FALSE;
}
/*
* Bait and switch for the kernel array only.
*/
unw.kernel_table.array = kernel_unw_table_entry_array;
machdep->flags |= UNW_READ;
return TRUE;
}
/*
* The main back trace loop. If we get interrupted in the midst of an
* operation, unw_in_progress will left TRUE, and the next time we come
* here, the script_cache will be cleared.
*/
void
#ifdef UNWIND_V1
unwind_v1(struct bt_info *bt)
#endif
#ifdef UNWIND_V2
unwind_v2(struct bt_info *bt)
#endif
#ifdef UNWIND_V3
unwind_v3(struct bt_info *bt)
#endif
{
struct unw_frame_info unw_frame_info, *info;
unsigned long ip, sp, bsp;
struct syment *sm;
struct pt_regs *pt;
int frame;
char *name, *name_plus_offset;
ulong offset;
struct load_module *lm;
static int unw_in_progress = FALSE;
char buf[BUFSIZE];
if (bt->debug)
CRASHDEBUG_SUSPEND(bt->debug);
if (!load_unw_table(unw_in_progress ? CLEAR_SCRIPT_CACHE : 0))
error(FATAL, "unwind: cannot read kernel unw table\n");
unw_in_progress = TRUE;
info = &unw_frame_info;
if (!unw_init_from_blocked_task(info, bt))
goto unwind_return;
frame = 0;
do {
restart:
unw_get_ip(info, &ip);
unw_get_sp(info, &sp);
unw_get_bsp(info, &bsp);
if (XEN_HYPER_MODE()) {
if (!IS_KVADDR(ip))
break;
} else {
if (ip < GATE_ADDR + PAGE_SIZE)
break;
}
name_plus_offset = NULL;
if ((sm = value_search(ip, &offset))) {
name = sm->name;
if ((bt->flags & BT_SYMBOL_OFFSET) && offset)
name_plus_offset = value_to_symstr(ip, buf, bt->radix);
} else
name = "(unknown)";
if (BT_REFERENCE_CHECK(bt)) {
switch (bt->ref->cmdflags &
(BT_REF_SYMBOL|BT_REF_HEXVAL))
{
case BT_REF_SYMBOL:
if (STREQ(name, bt->ref->str)) {
bt->ref->cmdflags |= BT_REF_FOUND;
goto unwind_return;
}
break;
case BT_REF_HEXVAL:
if (bt->ref->hexval == ip) {
bt->ref->cmdflags |= BT_REF_FOUND;
goto unwind_return;
}
break;
}
} else {
fprintf(fp, "%s#%d [BSP:%lx] %s at %lx",
frame >= 10 ? "" : " ", frame,
bsp, name_plus_offset ? name_plus_offset : name, ip);
if (module_symbol(ip, NULL, &lm, NULL, 0))
fprintf(fp, " [%s]", lm->mod_name);
fprintf(fp, "\n");
if (bt->flags & BT_FULL)
rse_function_params(bt, info, name);
if (bt->flags & BT_LINE_NUMBERS)
ia64_dump_line_number(ip);
if (info->flags & UNW_FLAG_INTERRUPT_FRAME) {
pt = (struct pt_regs *)info->psp - 1;
ia64_exception_frame((ulong)pt, bt);
}
}
if (STREQ(name, "start_kernel") ||
STREQ(name, "start_secondary") ||
STREQ(name, "start_kernel_thread"))
break;
/*
* "init_handler_platform" indicates that this task was
* interrupted by INIT and its stack was switched.
*/
if (STREQ(name, "init_handler_platform")) {
unw_switch_from_osinit_v1(info, bt);
frame++;
goto restart;
}
/*
* In some cases, init_handler_platform is inlined into
* ia64_init_handler.
*/
if (STREQ(name, "ia64_init_handler")) {
if (symbol_exists("ia64_mca_modify_original_stack")) {
/*
* 2.6.14 or later kernels no longer keep
* minstate info in pt_regs/switch_stack.
* unw_switch_from_osinit_v3() will try
* to find the interrupted task and restart
* backtrace itself.
*/
if (unw_switch_from_osinit_v3(info, bt, "INIT") == FALSE)
break;
} else {
if (unw_switch_from_osinit_v2(info, bt) == FALSE)
break;
frame++;
goto restart;
}
}
if (STREQ(name, "ia64_mca_handler") &&
symbol_exists("ia64_mca_modify_original_stack"))
if (unw_switch_from_osinit_v3(info, bt, "MCA") == FALSE)
break;
frame++;
} while (unw_unwind(info) >= 0);
unwind_return:
if (bt->flags & BT_UNWIND_ERROR)
load_unw_table(CLEAR_SCRIPT_CACHE);
if (bt->debug)
CRASHDEBUG_RESTORE();
unw_in_progress = FALSE;
}
void
#ifdef UNWIND_V1
dump_unwind_stats_v1(void)
#endif
#ifdef UNWIND_V2
dump_unwind_stats_v2(void)
#endif
#ifdef UNWIND_V3
dump_unwind_stats_v3(void)
#endif
{
int i;
struct machine_specific *ms;
char buf[BUFSIZE];
if (machdep->flags & UNW_OUT_OF_SYNC) {
fprintf(fp, "\n");
return;
}
ms = machdep->machspec;
fprintf(fp, " %2ld%% (%ld of %ld)\n",
ms->script_cache_fills ?
(ms->script_cache_hits * 100)/ms->script_cache_fills : 0,
ms->script_cache_hits, ms->script_cache_fills);
for (i = 0; i < UNW_CACHE_SIZE; i++) {
if (ms->script_cache[i].ip)
fprintf(fp, " [%3d]: %lx %s\n",
i, ms->script_cache[i].ip,
value_to_symstr(ms->script_cache[i].ip, buf, 0));
}
}
int
#ifdef UNWIND_V1
unwind_debug_v1(ulong arg)
#endif
#ifdef UNWIND_V2
unwind_debug_v2(ulong arg)
#endif
#ifdef UNWIND_V3
unwind_debug_v3(ulong arg)
#endif
{
struct unw_table *table, *target;
struct unw_table unw_table_buf;
target = (struct unw_table *)arg;
table = unw.tables;
do {
if (!readmem((ulong)table, KVADDR, &unw_table_buf,
sizeof(struct unw_table), "module unw_table",
RETURN_ON_ERROR))
break;
switch (arg)
{
case 3:
dump_unwind_table(table);
break;
default:
if (table == target)
dump_unwind_table(table);
break;
}
table = &unw_table_buf;
table = table->next;
} while (table);
return TRUE;
}
static void
dump_unwind_table(struct unw_table *table)
{
struct unw_table unw_table_buf, *tbl;
readmem((ulong)table, KVADDR, &unw_table_buf,
sizeof(struct unw_table), "module unw_table",
RETURN_ON_ERROR);
tbl = &unw_table_buf;
dump_struct("unw_table", (ulong)table, RADIX(16));
}
static unsigned long
get_init_stack_ulong(unsigned long addr)
{
unsigned long tmp;
readmem(addr, KVADDR, &tmp, sizeof(unsigned long),
"get_init_stack_ulong", FAULT_ON_ERROR);
return tmp;
}
static int
unw_init_from_blocked_task(struct unw_frame_info *info, struct bt_info *bt)
{
ulong sw;
sw = SWITCH_STACK_ADDR(bt->task);
if (XEN_HYPER_MODE()) {
if (!INSTACK(sw, bt) && !ia64_in_mca_stack_hyper(sw, bt))
return FALSE;
} else {
if (!INSTACK(sw, bt) && !ia64_in_init_stack(sw))
return FALSE;
}
unw_init_frame_info(info, bt, sw);
return TRUE;
}
/*
* unw_init_from_interruption
* Initialize frame info from specified pt_regs/switch_stack.
*
* Similar to unw_init_frame_info() except that:
* - do not use readmem to access stack
* (because stack may be modified by unw_init_from_saved_regs)
* - use ar.ifs and ar.iip instead of ar.pfs and b0, respectively
* - use sof(size-of-frame) of ar.ifs to caluculate bsp,
* instead of sol(size-of-local) of ar.pfs
* (because of cover instruction in kernel minstate save macro)
*/
static void
unw_init_from_interruption(struct unw_frame_info *info, struct bt_info *bt, ulong pt, ulong sw)
{
// unsigned long rbslimit, rbstop, stklimit, stktop, sof, ar_pfs;
unsigned long rbslimit, rbstop, stklimit, stktop, sof;
ulong t;
t = bt->task;
memset(info, 0, sizeof(*info));
rbslimit = (unsigned long) t + IA64_RBS_OFFSET;
rbstop = IA64_GET_STACK_ULONG(sw + OFFSET(switch_stack_ar_bspstore));
if (rbstop - (unsigned long) t >= IA64_STK_OFFSET)
rbstop = rbslimit;
stklimit = (unsigned long) t + IA64_STK_OFFSET;
stktop = IA64_GET_STACK_ULONG(pt + offsetof(struct pt_regs, r12));
if (stktop <= rbstop)
stktop = rbstop;
info->regstk.limit = rbslimit;
info->regstk.top = rbstop;
info->memstk.limit = stklimit;
info->memstk.top = stktop;
info->task = (struct task_struct *)bt;
info->sw = (struct switch_stack *)sw;
info->sp = info->psp = stktop;
info->pr = IA64_GET_STACK_ULONG(sw + OFFSET(switch_stack_pr));
info->cfm_loc = (unsigned long *) (pt + offsetof(struct pt_regs, cr_ifs));
info->unat_loc = (unsigned long *) (pt + offsetof(struct pt_regs, ar_unat));
info->pfs_loc = (unsigned long *) (pt + offsetof(struct pt_regs, ar_pfs));
/* register stack is covered */
sof = IA64_GET_STACK_ULONG(info->cfm_loc) & 0x7f;
info->bsp = (unsigned long)
ia64_rse_skip_regs((unsigned long *) info->regstk.top, -sof);
/* interrupted ip is saved in iip */
info->ip = IA64_GET_STACK_ULONG(pt + offsetof(struct pt_regs, cr_iip));
#if defined(UNWIND_V2) || defined(UNWIND_V3)
info->pt = pt;
#endif
find_save_locs(info);
}
/*
* unw_switch_from_osinit
* switch back to interrupted context
*
* assumption: init_handler_platform() has 3 arguments,
* 2nd arg is pt_regs and 3rd arg is switch_stack.
*/
static int
unw_switch_from_osinit_v1(struct unw_frame_info *info, struct bt_info *bt)
{
unsigned long pt, sw;
char is_nat;
/* pt_regs is the 2nd argument of init_handler_platform */
if (unw_get_gr(info, 33, &pt, &is_nat)) {
fprintf(fp, "gr 33 get error\n");
return FALSE;
}
/* switch_stack is the 3rd argument of init_handler_platform */
if (unw_get_gr(info, 34, &sw, &is_nat)) {
fprintf(fp, "gr 33 get error\n");
return FALSE;
}
unw_init_from_interruption(info, bt, pt, sw);
ia64_exception_frame(pt, bt);
return TRUE;
}
static int
unw_switch_from_osinit_v2(struct unw_frame_info *info, struct bt_info *bt)
{
unsigned long pt, sw;
char is_nat;
/* pt_regs is the 1st argument of ia64_init_handler */
if (unw_get_gr(info, 32, &pt, &is_nat)) {
fprintf(fp, "gr 32 get error\n");
return FALSE;
}
/* switch_stack is the 2nd argument of ia64_init_handler */
if (unw_get_gr(info, 33, &sw, &is_nat)) {
fprintf(fp, "gr 33 get error\n");
return FALSE;
}
/* Fix me! */
sw = info->psp + 16;
pt = sw + STRUCT_SIZE("switch_stack");
unw_init_from_interruption(info, bt, pt, sw);
ia64_exception_frame(pt, bt);
return TRUE;
}
/* CPL (current privilege level) is 2-bit field */
#define IA64_PSR_CPL0_BIT 32
#define IA64_PSR_CPL_MASK (3UL << IA64_PSR_CPL0_BIT)
static int
user_mode(struct bt_info *bt, unsigned long pt)
{
unsigned long cr_ipsr;
cr_ipsr = IA64_GET_STACK_ULONG(pt + offsetof(struct pt_regs, cr_ipsr));
if (cr_ipsr & IA64_PSR_CPL_MASK)
return 1;
return 0;
}
/*
* Cope with INIT/MCA stack for the kernel 2.6.14 or later
*
* Returns FALSE if no more unwinding is needed.
*/
#define ALIGN16(x) ((x)&~15)
static int
unw_switch_from_osinit_v3(struct unw_frame_info *info, struct bt_info *bt,
char *type)
{
unsigned long pt, sw, sos, pid;
char *p, *q;
struct task_context *tc = NULL;
struct bt_info clone_bt;
unsigned long kr_current, offset_kr;
/*
* The structure of INIT/MCA stack
*
* +---------------------------+ <-------- IA64_STK_OFFSET
* | pt_regs |
* +---------------------------+
* | switch_stack |
* +---------------------------+
* | SAL/OS state |
* +---------------------------+
* | 16 byte scratch area |
* +---------------------------+ <-------- SP at start of C handler
* | ..... |
* +---------------------------+
* | RBS for MCA/INIT handler |
* +---------------------------+
* | struct task for MCA/INIT |
* +---------------------------+ <-------- bt->task
*/
pt = ALIGN16(bt->task + IA64_STK_OFFSET - STRUCT_SIZE("pt_regs"));
sw = ALIGN16(pt - STRUCT_SIZE("switch_stack"));
sos = ALIGN16(sw - STRUCT_SIZE("ia64_sal_os_state"));
/*
* 1. Try to find interrupted task from comm
*
* comm format of INIT/MCA task:
* - "<type> <pid>"
* - "<type> <comm> <processor>"
* where "<type>" is either "INIT" or "MCA".
* The latter form is chosen if PID is 0.
*
* See ia64_mca_modify_comm() in arch/ia64/kernel/mca.c
*/
if (!bt->tc || !bt->tc->comm)
goto find_exframe;
/*
* If comm is "INIT" or "MCA", it means original stack is not modified.
*/
if (STREQ(bt->tc->comm, type)) {
/* Get pid using ia64_sal_os_state */
pid = 0;
offset_kr = MEMBER_OFFSET("ia64_sal_os_state",
"prev_IA64_KR_CURRENT");
readmem(sos + offset_kr, KVADDR, &kr_current, sizeof(ulong),
"ia64_sal_os_state prev_IA64_KR_CURRENT",
FAULT_ON_ERROR);
readmem(kr_current + OFFSET(task_struct_pid), KVADDR, &pid,
sizeof(pid_t), "task_struct pid", FAULT_ON_ERROR);
if (pid)
tc = pid_to_context(pid);
else {
tc = pid_to_context(0);
while (tc) {
if (tc != bt->tc &&
tc->processor == bt->tc->processor)
break;
tc = tc->tc_next;
}
}
if (tc) {
/* Clone bt_info and do backtrace */
clone_bt_info(bt, &clone_bt, tc);
if (!BT_REFERENCE_CHECK(&clone_bt)) {
fprintf(fp, "(%s) INTERRUPTED TASK\n", type);
print_task_header(fp, tc, 0);
}
if (!user_mode(bt, pt))
goto find_exframe;
else if (!BT_REFERENCE_CHECK(bt)) {
fprintf(fp, " #0 [interrupted in user space]\n");
/* at least show the incomplete exception frame */
bt->flags |= BT_INCOMPLETE_USER_EFRAME;
ia64_exception_frame(pt, bt);
}
}
return FALSE;
}
if ((p = strstr(bt->tc->comm, type))) {
p += strlen(type);
if (*p != ' ')
goto find_exframe;
if ((q = strchr(++p, ' '))) {
/*
* "<type> <comm> <processor>"
*
* We came from one of the PID 0 swapper tasks,
* so just find the one with the same cpu as
* the passed-in INIT/MCA task.
*/
tc = pid_to_context(0);
while (tc) {
if (tc != bt->tc &&
tc->processor == bt->tc->processor)
break;
tc = tc->tc_next;
}
} else if (sscanf(p, "%lu", &pid) > 0)
/* "<type> <pid>" */
tc = pid_to_context(pid);
}
if (tc) {
/* Clone bt_info and do backtrace */
clone_bt_info(bt, &clone_bt, tc);
if (!BT_REFERENCE_CHECK(&clone_bt)) {
fprintf(fp, "(%s) INTERRUPTED TASK\n", type);
print_task_header(fp, tc, 0);
}
if (!user_mode(bt, pt))
back_trace(&clone_bt);
else if (!BT_REFERENCE_CHECK(bt)) {
fprintf(fp, " #0 [interrupted in user space]\n");
/* at least show the incomplete exception frame */
bt->flags |= BT_INCOMPLETE_USER_EFRAME;
ia64_exception_frame(pt, bt);
}
return FALSE;
}
/* task matching with INIT/MCA task's comm is not found */
find_exframe:
/*
* 2. If step 1 doesn't work, try best to find exception frame
*/
unw_init_from_interruption(info, bt, pt, sw);
if (!BT_REFERENCE_CHECK(bt))
ia64_exception_frame(pt, bt);
return TRUE;
}
static void
unw_init_frame_info (struct unw_frame_info *info, struct bt_info *bt, ulong sw)
{
unsigned long rbslimit, rbstop, stklimit, stktop, sol, ar_pfs;
ulong t;
t = bt->task;
/*
* Subtle stuff here: we _could_ unwind through the
* switch_stack frame but we don't want to do that because it
* would be slow as each preserved register would have to be
* processed. Instead, what we do here is zero out the frame
* info and start the unwind process at the function that
* created the switch_stack frame. When a preserved value in
* switch_stack needs to be accessed, run_script() will
* initialize the appropriate pointer on demand.
*/
memset(info, 0, sizeof(*info));
rbslimit = (unsigned long) t + IA64_RBS_OFFSET;
readmem(sw + OFFSET(switch_stack_ar_bspstore), KVADDR,
&rbstop, sizeof(ulong), "switch_stack ar_bspstore",
FAULT_ON_ERROR);
if (rbstop - (unsigned long) t >= IA64_STK_OFFSET)
rbstop = rbslimit;
stklimit = (unsigned long) t + IA64_STK_OFFSET;
stktop = (unsigned long) sw - 16;
if (stktop <= rbstop)
stktop = rbstop;
info->regstk.limit = rbslimit;
info->regstk.top = rbstop;
info->memstk.limit = stklimit;
info->memstk.top = stktop;
info->task = (struct task_struct *)bt;
info->sw = (struct switch_stack *)sw;
info->sp = info->psp = (unsigned long) (sw + SIZE(switch_stack)) - 16;
info->cfm_loc = (ulong *)(sw + OFFSET(switch_stack_ar_pfs));
ar_pfs = IA64_GET_STACK_ULONG(info->cfm_loc);
sol = (ar_pfs >> 7) & 0x7f;
info->bsp = (unsigned long)
ia64_rse_skip_regs((unsigned long *) info->regstk.top, -sol);
info->ip = IA64_GET_STACK_ULONG(sw + OFFSET(switch_stack_b0));
info->pr = IA64_GET_STACK_ULONG(sw + OFFSET(switch_stack_pr));
find_save_locs(info);
}
/*
* Display the arguments to a function, presuming that they are found at
* the beginning of the sol section.
*/
#define MAX_REGISTER_PARAMS (8)
static void
rse_function_params(struct bt_info *bt, struct unw_frame_info *info, char *name)
{
int i;
int numargs;
char is_nat[MAX_REGISTER_PARAMS];
int retval[MAX_REGISTER_PARAMS];
char buf1[BUFSIZE], buf2[BUFSIZE], buf3[BUFSIZE], *p1;
ulong arglist[MAX_REGISTER_PARAMS];
ulong ip;
if (GDB_PATCHED())
return;
unw_get_ip(info, &ip);
numargs = MIN(get_function_numargs(ip), MAX_REGISTER_PARAMS);
if (CRASHDEBUG(1))
fprintf(fp, "rse_function_params: %s: %d args\n",
name, numargs);
switch (numargs)
{
case 0:
fprintf(fp, " (void)\n");
return;
case -1:
return;
default:
break;
}
for (i = 0; i < numargs; i++) {
arglist[i] = is_nat[i] = retval[i] = 0;
retval[i] = unw_get_gr(info, 32+i, &arglist[i], &is_nat[i]);
}
sprintf(buf1, " (");
for (i = 0; i < numargs; i++) {
p1 = &buf1[strlen(buf1)];
if (retval[i] != 0)
sprintf(buf2, "unknown");
if (is_nat[i])
sprintf(buf2, "[NAT]");
else {
if (bt->flags & BT_FULL_SYM_SLAB)
sprintf(buf2, "%s",
format_stack_entry(bt, buf3,
arglist[i], kt->end));
else
sprintf(buf2, "%lx", arglist[i]);
}
sprintf(p1, "%s%s", i ? ", " : "", buf2);
if (strlen(buf1) >= 80)
sprintf(p1, ",\n %s", buf2);
}
strcat(buf1, ")\n");
fprintf(fp, "%s", buf1);
}
static int
find_save_locs (struct unw_frame_info *info)
{
struct unw_script *scr;
if ((info->ip & (machdep->machspec->unimpl_va_mask | 0xf)) ||
IS_UVADDR(info->ip, NULL)) {
info->rp_loc = 0;
return -1;
}
scr = script_lookup(info);
if (!scr) {
scr = build_script(info);
if (!scr) {
error(INFO,
"failed to build unwind script for ip %lx\n",
info->ip);
return -1;
}
}
run_script(scr, info);
return 0;
}
static int
unw_unwind (struct unw_frame_info *info)
{
unsigned long prev_ip, prev_sp, prev_bsp;
unsigned long ip, pr, num_regs;
int retval;
struct bt_info *bt = (struct bt_info *)info->task;
prev_ip = info->ip;
prev_sp = info->sp;
prev_bsp = info->bsp;
/* restore the ip */
if (!info->rp_loc) {
error(INFO,
"unwind: failed to locate return link (ip=0x%lx)!\n",
info->ip);
return -1;
}
ip = info->ip = IA64_GET_STACK_ULONG(info->rp_loc);
if (ip < GATE_ADDR + PAGE_SIZE) {
/*
* We don't have unwind info for the gate page,
* so we consider that part
* of user-space for the purpose of unwinding.
*/
console("unwind: reached user-space (ip=0x%lx)\n", ip);
return -1;
}
/* restore the cfm: */
if (!info->pfs_loc) {
error(INFO, "unwind: failed to locate ar.pfs!\n");
return -1;
}
info->cfm_loc = info->pfs_loc;
/* restore the bsp: */
pr = info->pr;
num_regs = 0;
if ((info->flags & UNW_FLAG_INTERRUPT_FRAME)) {
#ifdef UNWIND_V1
if ((pr & (1UL << pNonSys)) != 0)
num_regs = IA64_GET_STACK_ULONG(info->cfm_loc) & 0x7f; /* size of frame */
info->pfs_loc =
(unsigned long *) (info->sp + 16 + struct_offset(struct pt_regs, ar_pfs));
#endif
#ifdef UNWIND_V2
info->pt = info->sp + 16;
if ((pr & (1UL << pNonSys)) != 0)
num_regs = IA64_GET_STACK_ULONG(info->cfm_loc) & 0x7f; /* size of frame */
info->pfs_loc =
(unsigned long *) (info->pt + offsetof(struct pt_regs, ar_pfs));
#endif
#ifdef UNWIND_V3
info->pt = info->sp + 16;
if ((pr & (1UL << pNonSys)) != 0)
num_regs = IA64_GET_STACK_ULONG(info->cfm_loc) & 0x7f; /* size of frame */
info->pfs_loc =
(unsigned long *) (info->pt + offsetof(struct pt_regs, ar_pfs));
#endif
} else
num_regs = (IA64_GET_STACK_ULONG(info->cfm_loc) >> 7) & 0x7f; /* size of locals */
info->bsp = (unsigned long) ia64_rse_skip_regs((unsigned long *) info->bsp, -num_regs);
if (info->bsp < info->regstk.limit || info->bsp > info->regstk.top) {
error(INFO, "unwind: bsp (0x%lx) out of range [0x%lx-0x%lx]\n",
info->bsp, info->regstk.limit, info->regstk.top);
return -1;
}
/* restore the sp: */
info->sp = info->psp;
if ((info->sp < info->memstk.top || info->sp > info->memstk.limit)
&& !ia64_in_init_stack(info->sp)) {
error(INFO, "unwind: sp (0x%lx) out of range [0x%lx-0x%lx]\n",
info->sp, info->memstk.top, info->memstk.limit);
return -1;
}
if (info->ip == prev_ip && info->sp == prev_sp && info->bsp == prev_bsp) {
error(INFO,
"unwind: ip, sp, bsp remain unchanged; stopping here (ip=0x%lx)\n",
ip);
return -1;
}
/* as we unwind, the saved ar.unat becomes the primary unat: */
info->pri_unat_loc = info->unat_loc;
/* finally, restore the predicates: */
unw_get_pr(info, &info->pr);
retval = find_save_locs(info);
return retval;
}
/*
* Apply the unwinding actions represented by OPS and update SR to
* reflect the state that existed upon entry to the function that this
* unwinder represents.
*/
static void
run_script (struct unw_script *script, struct unw_frame_info *state)
{
struct unw_insn *ip, *limit, next_insn;
unsigned long opc, dst, val, off;
unsigned long *s = (unsigned long *) state;
struct bt_info *bt = (struct bt_info *)state->task;
state->flags = script->flags;
ip = script->insn;
limit = script->insn + script->count;
next_insn = *ip;
while (ip++ < limit) {
opc = next_insn.opc;
dst = next_insn.dst;
val = next_insn.val;
next_insn = *ip;
redo:
switch (opc) {
case UNW_INSN_ADD:
s[dst] += val;
break;
case UNW_INSN_MOVE2:
if (!s[val])
goto lazy_init;
s[dst+1] = s[val+1];
s[dst] = s[val];
break;
case UNW_INSN_MOVE:
if (!s[val])
goto lazy_init;
s[dst] = s[val];
break;
#if defined(UNWIND_V2) || defined(UNWIND_V3)
case UNW_INSN_MOVE_SCRATCH:
if (state->pt) {
s[dst] = (unsigned long) get_scratch_regs(state) + val;
} else {
s[dst] = 0;
}
break;
#endif
case UNW_INSN_MOVE_STACKED:
s[dst] = (unsigned long) ia64_rse_skip_regs((unsigned long *)state->bsp,
val);
break;
case UNW_INSN_ADD_PSP:
s[dst] = state->psp + val;
break;
case UNW_INSN_ADD_SP:
s[dst] = state->sp + val;
break;
case UNW_INSN_SETNAT_MEMSTK:
if (!state->pri_unat_loc)
state->pri_unat_loc = &state->sw->ar_unat;
/* register off. is a multiple of 8, so the least 3 bits (type) are 0 */
s[dst+1] = ((unsigned long)(state->pri_unat_loc) - s[dst]) | UNW_NAT_MEMSTK;
break;
case UNW_INSN_SETNAT_TYPE:
s[dst+1] = val;
break;
case UNW_INSN_LOAD:
#if UNW_DEBUG
if ((s[val] & (local_cpu_data->unimpl_va_mask | 0x7)) != 0
|| s[val] < TASK_SIZE)
{
debug(1, "unwind: rejecting bad psp=0x%lx\n", s[val]);
break;
}
#endif
s[dst] = IA64_GET_STACK_ULONG(s[val]);
break;
}
}
return;
lazy_init:
off = unw.sw_off[val];
s[val] = (unsigned long) state->sw + off;
if (off >= struct_offset(struct switch_stack, r4)
&& off <= struct_offset(struct switch_stack, r7))
/*
* We're initializing a general register: init NaT info, too. Note that
* the offset is a multiple of 8 which gives us the 3 bits needed for
* the type field.
*/
s[val+1] = (struct_offset(struct switch_stack, ar_unat) - off) | UNW_NAT_MEMSTK;
goto redo;
}
/*
* Don't bother with the kernel's script hashing scheme -- we're not worried
* about lookup speed.
*/
static struct unw_script *
script_lookup(struct unw_frame_info *info)
{
int i;
struct unw_script *script;
unsigned long ip, pr;
struct machine_specific *ms;
ms = machdep->machspec;
ms->script_cache_fills++;
ip = info->ip;
pr = info->pr;
for (i = 0; i < UNW_CACHE_SIZE; i++) {
script = &ms->script_cache[i];
if (!script->ip)
break;
if ((ip == script->ip) &&
(((pr ^ script->pr_val) & script->pr_mask) == 0)) {
ms->script_cache_hits++;
return script;
}
}
return NULL;
}
static struct unw_script *
script_new(unsigned long ip)
{
struct unw_script *script;
struct machine_specific *ms;
ms = machdep->machspec;
script = &ms->script_cache[ms->script_index];
BZERO(script, sizeof(struct unw_script));
ms->script_index++;
ms->script_index %= UNW_CACHE_SIZE;
script->ip = ip;
return script;
}
static void
script_finalize (struct unw_script *script, struct unw_state_record *sr)
{
script->pr_mask = sr->pr_mask;
script->pr_val = sr->pr_val;
}
static void
script_emit(struct unw_script *script, struct unw_insn insn)
{
if (script->count >= UNW_MAX_SCRIPT_LEN) {
error(INFO,
"unwind: script exceeds maximum size of %u instructions!\n",
UNW_MAX_SCRIPT_LEN);
return;
}
script->insn[script->count++] = insn;
}
static void
emit_nat_info(struct unw_state_record *sr, int i, struct unw_script *script)
{
struct unw_reg_info *r = sr->curr.reg + i;
enum unw_insn_opcode opc;
struct unw_insn insn;
unsigned long val = 0;
switch (r->where) {
case UNW_WHERE_GR:
if (r->val >= 32) {
/* register got spilled to a stacked register */
opc = UNW_INSN_SETNAT_TYPE;
val = UNW_NAT_REGSTK;
} else
/* register got spilled to a scratch register */
opc = UNW_INSN_SETNAT_MEMSTK;
break;
case UNW_WHERE_FR:
opc = UNW_INSN_SETNAT_TYPE;
val = UNW_NAT_VAL;
break;
case UNW_WHERE_BR:
opc = UNW_INSN_SETNAT_TYPE;
val = UNW_NAT_NONE;
break;
case UNW_WHERE_PSPREL:
case UNW_WHERE_SPREL:
opc = UNW_INSN_SETNAT_MEMSTK;
break;
default:
error(INFO,
"unwind: don't know how to emit nat info for where = %u\n",
r->where);
return;
}
insn.opc = opc;
insn.dst = unw.preg_index[i];
insn.val = val;
script_emit(script, insn);
}
/*
* Build an unwind script that unwinds from state OLD_STATE to the
* entrypoint of the function that called OLD_STATE.
*/
#define UNWIND_INFO_BUFSIZE (3000) /* absurdly large static buffer that */
/* should avoid need for GETBUF() */
static struct unw_script *
build_script (struct unw_frame_info *info)
{
const struct unw_table_entry *e = 0;
struct unw_script *script = 0;
struct unw_labeled_state *ls, *next;
unsigned long ip = info->ip;
struct unw_state_record sr;
struct unw_table *table;
struct unw_reg_info *r;
struct unw_insn insn;
u8 *dp, *desc_end;
u64 hdr;
int i;
struct unw_table unw_table_buf;
char unwind_info_buf[UNWIND_INFO_BUFSIZE];
struct bt_info *bt = (struct bt_info *)info->task;
/* build state record */
memset(&sr, 0, sizeof(sr));
for (r = sr.curr.reg; r < sr.curr.reg + UNW_NUM_REGS; ++r)
r->when = UNW_WHEN_NEVER;
sr.pr_val = info->pr;
script = script_new(ip);
if (!script) {
error(INFO, "failed to create a new unwind script\n");
return 0;
}
/*
* The kernel table is embedded and guaranteed to be the first
* one on the list.
*/
table = &unw.kernel_table;
if (ip >= table->start && ip < table->end)
e = lookup(table, ip - table->segment_base);
/*
* If not found, walk through the module list.
*/
while (!e && table->next) {
if (!readmem((ulong)table->next, KVADDR, &unw_table_buf,
sizeof(struct unw_table), "module unw_table",
RETURN_ON_ERROR))
break;
table = &unw_table_buf;
if (ip >= table->start && ip < table->end)
e = lookup(table, ip - table->segment_base);
}
if (!e) {
/* no info, return default unwinder (leaf proc, no mem stack,
no saved regs) */
if (CRASHDEBUG(2))
error(INFO, "unwind: no unwind info for ip %lx\n", ip);
bt->flags |= BT_UNWIND_ERROR;
sr.curr.reg[UNW_REG_RP].where = UNW_WHERE_BR;
sr.curr.reg[UNW_REG_RP].when = -1;
sr.curr.reg[UNW_REG_RP].val = 0;
compile_reg(&sr, UNW_REG_RP, script);
script_finalize(script, &sr);
return script;
}
sr.when_target =
(3*((ip & ~0xfUL) - (table->segment_base + e->start_offset))/16
+ (ip & 0xfUL));
#ifdef REDHAT
readmem((ulong)(table->segment_base + e->info_offset), KVADDR,
unwind_info_buf, UNWIND_INFO_BUFSIZE, "unwind info",
FAULT_ON_ERROR);
hdr = *(u64 *)unwind_info_buf;
if (((UNW_LENGTH(hdr)*8)+8) > UNWIND_INFO_BUFSIZE)
error(FATAL,
"absurdly large unwind_info: %d (redefine UNWIND_INFO_BUFSIZE)\n",
(UNW_LENGTH(hdr)*8)+8);
dp = (u8 *)(unwind_info_buf + 8);
desc_end = dp + 8*UNW_LENGTH(hdr);
#else
hdr = *(u64 *) (table->segment_base + e->info_offset);
dp = (u8 *) (table->segment_base + e->info_offset + 8);
desc_end = dp + 8*UNW_LENGTH(hdr);
#endif
while (!sr.done && dp < desc_end)
dp = unw_decode(dp, sr.in_body, &sr);
if (sr.when_target > sr.epilogue_start) {
/*
* sp has been restored and all values on the memory stack below
* psp also have been restored.
*/
sr.curr.reg[UNW_REG_PSP].val = 0;
sr.curr.reg[UNW_REG_PSP].where = UNW_WHERE_NONE;
sr.curr.reg[UNW_REG_PSP].when = UNW_WHEN_NEVER;
for (r = sr.curr.reg; r < sr.curr.reg + UNW_NUM_REGS; ++r)
if ((r->where == UNW_WHERE_PSPREL && r->val <= 0x10)
|| r->where == UNW_WHERE_SPREL)
{
r->val = 0;
r->where = UNW_WHERE_NONE;
r->when = UNW_WHEN_NEVER;
}
}
script->flags = sr.flags;
/*
* If RP did't get saved, generate entry for the return link
* register.
*/
if (sr.curr.reg[UNW_REG_RP].when >= sr.when_target) {
sr.curr.reg[UNW_REG_RP].where = UNW_WHERE_BR;
sr.curr.reg[UNW_REG_RP].when = -1;
sr.curr.reg[UNW_REG_RP].val = sr.return_link_reg;
}
/* translate state record into unwinder instructions: */
/*
* First, set psp if we're dealing with a fixed-size frame;
* subsequent instructions may depend on this value.
*/
if (sr.when_target > sr.curr.reg[UNW_REG_PSP].when
&& (sr.curr.reg[UNW_REG_PSP].where == UNW_WHERE_NONE)
&& sr.curr.reg[UNW_REG_PSP].val != 0) {
/* new psp is sp plus frame size */
insn.opc = UNW_INSN_ADD;
insn.dst = struct_offset(struct unw_frame_info, psp)/8;
insn.val = sr.curr.reg[UNW_REG_PSP].val; /* frame size */
script_emit(script, insn);
}
/* determine where the primary UNaT is: */
if (sr.when_target < sr.curr.reg[UNW_REG_PRI_UNAT_GR].when)
i = UNW_REG_PRI_UNAT_MEM;
else if (sr.when_target < sr.curr.reg[UNW_REG_PRI_UNAT_MEM].when)
i = UNW_REG_PRI_UNAT_GR;
else if (sr.curr.reg[UNW_REG_PRI_UNAT_MEM].when >
sr.curr.reg[UNW_REG_PRI_UNAT_GR].when)
i = UNW_REG_PRI_UNAT_MEM;
else
i = UNW_REG_PRI_UNAT_GR;
compile_reg(&sr, i, script);
for (i = UNW_REG_BSP; i < UNW_NUM_REGS; ++i)
compile_reg(&sr, i, script);
/* free labeled register states & stack: */
for (ls = sr.labeled_states; ls; ls = next) {
next = ls->next;
free_state_stack(&ls->saved_state);
free_labeled_state(ls);
}
free_state_stack(&sr.curr);
script_finalize(script, &sr);
return script;
}
static struct unw_table_entry *
lookup(struct unw_table *table, unsigned long rel_ip)
{
struct unw_table_entry *e = 0;
unsigned long lo, hi, mid;
struct unw_table_entry *array, *loc_array;
static struct unw_table_entry e_returned;
if (table == &unw.kernel_table) {
array = (struct unw_table_entry *)table->array;
loc_array = NULL;
} else {
loc_array = (struct unw_table_entry *)
GETBUF(table->length * sizeof(struct unw_table_entry));
if (!readmem((ulong)table->array, KVADDR, loc_array,
table->length * sizeof(struct unw_table_entry),
"module unw_table_entry array", RETURN_ON_ERROR|QUIET)) {
if (IS_MODULE_VADDR(table->segment_base + rel_ip))
error(WARNING,
"cannot read module unw_table_entry array\n");
return 0;
}
array = loc_array;
}
/* do a binary search for right entry: */
for (lo = 0, hi = table->length; lo < hi; ) {
mid = (lo + hi) / 2;
e = &array[mid];
if (rel_ip < e->start_offset)
hi = mid;
else if (rel_ip >= e->end_offset)
lo = mid + 1;
else
break;
}
/*
* Return a pointer to a static copy of "e" if found, and
* give back the module buffer if used.
*/
if (e) {
BCOPY(e, &e_returned, sizeof(struct unw_table_entry));
e = &e_returned;
}
if (loc_array)
FREEBUF(loc_array);
if (rel_ip < e->start_offset || rel_ip >= e->end_offset)
return NULL;
return e;
}
static void
compile_reg (struct unw_state_record *sr, int i, struct unw_script *script)
{
struct unw_reg_info *r = sr->curr.reg + i;
enum unw_insn_opcode opc;
unsigned long val, rval;
struct unw_insn insn;
long need_nat_info;
if (machdep->flags & UNW_PTREGS) {
compile_reg_v2(sr, i, script);
return;
}
if (r->where == UNW_WHERE_NONE || r->when >= sr->when_target)
return;
opc = UNW_INSN_MOVE;
val = rval = r->val;
need_nat_info = (i >= UNW_REG_R4 && i <= UNW_REG_R7);
switch (r->where) {
case UNW_WHERE_GR:
if (rval >= 32) {
opc = UNW_INSN_MOVE_STACKED;
val = rval - 32;
} else if (rval >= 4 && rval <= 7) {
if (need_nat_info) {
opc = UNW_INSN_MOVE2;
need_nat_info = 0;
}
val = unw.preg_index[UNW_REG_R4 + (rval - 4)];
} else {
opc = UNW_INSN_ADD_SP;
val = -SIZE(pt_regs) + pt_regs_off(rval);
}
break;
case UNW_WHERE_FR:
if (rval <= 5)
val = unw.preg_index[UNW_REG_F2 + (rval - 2)];
else if (rval >= 16 && rval <= 31)
val = unw.preg_index[UNW_REG_F16 + (rval - 16)];
else {
opc = UNW_INSN_ADD_SP;
val = -SIZE(pt_regs);
if (rval <= 9)
val += struct_offset(struct pt_regs, f6) + 16*(rval - 6);
else
error(INFO,
"unwind: kernel may not touch f%lu\n",
rval);
}
break;
case UNW_WHERE_BR:
if (rval >= 1 && rval <= 5)
val = unw.preg_index[UNW_REG_B1 + (rval - 1)];
else {
opc = UNW_INSN_ADD_SP;
val = -SIZE(pt_regs);
if (rval == 0)
val += struct_offset(struct pt_regs, b0);
else if (rval == 6)
val += struct_offset(struct pt_regs, b6);
else
val += struct_offset(struct pt_regs, b7);
}
break;
case UNW_WHERE_SPREL:
opc = UNW_INSN_ADD_SP;
break;
case UNW_WHERE_PSPREL:
opc = UNW_INSN_ADD_PSP;
break;
default:
error(INFO,
"unwind: register %u has unexpected `where' value of %u\n",
i, r->where);
break;
}
insn.opc = opc;
insn.dst = unw.preg_index[i];
insn.val = val;
script_emit(script, insn);
if (need_nat_info)
emit_nat_info(sr, i, script);
if (i == UNW_REG_PSP) {
/*
* info->psp must contain the _value_ of the previous
* sp, not it's save location. We get this by
* dereferencing the value we just stored in
* info->psp:
*/
insn.opc = UNW_INSN_LOAD;
insn.dst = insn.val = unw.preg_index[UNW_REG_PSP];
script_emit(script, insn);
}
}
static void
compile_reg_v2 (struct unw_state_record *sr, int i, struct unw_script *script)
{
struct unw_reg_info *r = sr->curr.reg + i;
enum unw_insn_opcode opc;
unsigned long val, rval;
struct unw_insn insn;
long need_nat_info;
if (r->where == UNW_WHERE_NONE || r->when >= sr->when_target)
return;
opc = UNW_INSN_MOVE;
val = rval = r->val;
need_nat_info = (i >= UNW_REG_R4 && i <= UNW_REG_R7);
switch (r->where) {
case UNW_WHERE_GR:
if (rval >= 32) {
opc = UNW_INSN_MOVE_STACKED;
val = rval - 32;
} else if (rval >= 4 && rval <= 7) {
if (need_nat_info) {
opc = UNW_INSN_MOVE2;
need_nat_info = 0;
}
val = unw.preg_index[UNW_REG_R4 + (rval - 4)];
} else {
/* register got spilled to a scratch register */
opc = UNW_INSN_MOVE_SCRATCH;
val = pt_regs_off(rval);
}
break;
case UNW_WHERE_FR:
if (rval <= 5)
val = unw.preg_index[UNW_REG_F2 + (rval - 2)];
else if (rval >= 16 && rval <= 31)
val = unw.preg_index[UNW_REG_F16 + (rval - 16)];
else {
opc = UNW_INSN_MOVE_SCRATCH;
if (rval <= 11)
val = offsetof(struct pt_regs, f6) + 16*(rval - 6);
else
error(INFO,
"compile_reg: kernel may not touch f%lu\n",
rval);
}
break;
case UNW_WHERE_BR:
if (rval >= 1 && rval <= 5)
val = unw.preg_index[UNW_REG_B1 + (rval - 1)];
else {
opc = UNW_INSN_MOVE_SCRATCH;
if (rval == 0)
val = offsetof(struct pt_regs, b0);
else if (rval == 6)
val = offsetof(struct pt_regs, b6);
else
val = offsetof(struct pt_regs, b7);
}
break;
case UNW_WHERE_SPREL:
opc = UNW_INSN_ADD_SP;
break;
case UNW_WHERE_PSPREL:
opc = UNW_INSN_ADD_PSP;
break;
default:
error(INFO,
"compile_reg: register %u has unexpected `where' value of %u\n",
i, r->where);
break;
}
insn.opc = opc;
insn.dst = unw.preg_index[i];
insn.val = val;
script_emit(script, insn);
if (need_nat_info)
emit_nat_info(sr, i, script);
if (i == UNW_REG_PSP) {
/*
* info->psp must contain the _value_ of the previous
* sp, not it's save location. We get this by
* dereferencing the value we just stored in
* info->psp:
*/
insn.opc = UNW_INSN_LOAD;
insn.dst = insn.val = unw.preg_index[UNW_REG_PSP];
script_emit(script, insn);
}
}
#endif /* IA64 */
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