mirror of
https://github.com/crash-utility/crash
synced 2024-12-14 13:14:31 +00:00
1252 lines
33 KiB
C
1252 lines
33 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#if defined(X86_64)
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/*
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* Support for genarating DWARF CFI based backtraces.
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* Borrowed heavily from the kernel's implementation of unwinding using the
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* DWARF CFI written by Jan Beulich
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*/
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#ifdef X86_64
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#include "unwind_x86_64.h"
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#endif
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#ifdef X86
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#include "unwind_x86.h"
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#endif
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#include "defs.h"
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#define MAX_STACK_DEPTH 8
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static struct local_unwind_table {
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struct {
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unsigned long pc;
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unsigned long range;
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} core, init;
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void *address;
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unsigned long size;
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} *local_unwind_tables, default_unwind_table;
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static int gather_in_memory_unwind_tables(void);
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static int populate_local_tables(ulong, char *);
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static int unwind_tables_cnt = 0;
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static struct local_unwind_table *find_table(unsigned long);
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static void dump_local_unwind_tables(void);
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static const struct {
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unsigned offs:BITS_PER_LONG / 2;
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unsigned width:BITS_PER_LONG / 2;
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} reg_info[] = {
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UNW_REGISTER_INFO
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};
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#undef PTREGS_INFO
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#undef EXTRA_INFO
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#ifndef REG_INVALID
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#define REG_INVALID(r) (reg_info[r].width == 0)
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#endif
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#define DW_CFA_nop 0x00
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#define DW_CFA_set_loc 0x01
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#define DW_CFA_advance_loc1 0x02
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#define DW_CFA_advance_loc2 0x03
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#define DW_CFA_advance_loc4 0x04
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#define DW_CFA_offset_extended 0x05
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#define DW_CFA_restore_extended 0x06
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#define DW_CFA_undefined 0x07
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#define DW_CFA_same_value 0x08
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#define DW_CFA_register 0x09
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#define DW_CFA_remember_state 0x0a
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#define DW_CFA_restore_state 0x0b
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#define DW_CFA_def_cfa 0x0c
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#define DW_CFA_def_cfa_register 0x0d
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#define DW_CFA_def_cfa_offset 0x0e
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#define DW_CFA_def_cfa_expression 0x0f
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#define DW_CFA_expression 0x10
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#define DW_CFA_offset_extended_sf 0x11
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#define DW_CFA_def_cfa_sf 0x12
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#define DW_CFA_def_cfa_offset_sf 0x13
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#define DW_CFA_val_offset 0x14
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#define DW_CFA_val_offset_sf 0x15
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#define DW_CFA_val_expression 0x16
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#define DW_CFA_lo_user 0x1c
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#define DW_CFA_GNU_window_save 0x2d
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#define DW_CFA_GNU_args_size 0x2e
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#define DW_CFA_GNU_negative_offset_extended 0x2f
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#define DW_CFA_hi_user 0x3f
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#define DW_EH_PE_FORM 0x07
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#define DW_EH_PE_native 0x00
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#define DW_EH_PE_leb128 0x01
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#define DW_EH_PE_data2 0x02
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#define DW_EH_PE_data4 0x03
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#define DW_EH_PE_data8 0x04
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#define DW_EH_PE_signed 0x08
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#define DW_EH_PE_ADJUST 0x70
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#define DW_EH_PE_abs 0x00
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#define DW_EH_PE_pcrel 0x10
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#define DW_EH_PE_textrel 0x20
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#define DW_EH_PE_datarel 0x30
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#define DW_EH_PE_funcrel 0x40
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#define DW_EH_PE_aligned 0x50
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#define DW_EH_PE_indirect 0x80
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#define DW_EH_PE_omit 0xff
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#define min(x,y) ({ \
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typeof(x) _x = (x); \
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typeof(y) _y = (y); \
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(void) (&_x == &_y); \
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_x < _y ? _x : _y; })
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#define max(x,y) ({ \
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typeof(x) _x = (x); \
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typeof(y) _y = (y); \
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(void) (&_x == &_y); \
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_x > _y ? _x : _y; })
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#define STACK_LIMIT(ptr) (((ptr) - 1) & ~(THREAD_SIZE - 1))
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typedef unsigned long uleb128_t;
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typedef signed long sleb128_t;
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struct unwind_item {
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enum item_location {
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Nowhere,
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Memory,
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Register,
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Value
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} where;
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uleb128_t value;
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};
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struct unwind_state {
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uleb128_t loc, org;
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const u8 *cieStart, *cieEnd;
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uleb128_t codeAlign;
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sleb128_t dataAlign;
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struct cfa {
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uleb128_t reg, offs;
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} cfa;
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struct unwind_item regs[ARRAY_SIZE(reg_info)];
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unsigned stackDepth:8;
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unsigned version:8;
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const u8 *label;
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const u8 *stack[MAX_STACK_DEPTH];
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};
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static const struct cfa badCFA = { ARRAY_SIZE(reg_info), 1 };
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static uleb128_t get_uleb128(const u8 **pcur, const u8 *end)
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{
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const u8 *cur = *pcur;
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uleb128_t value;
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unsigned shift;
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for (shift = 0, value = 0; cur < end; shift += 7) {
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if (shift + 7 > 8 * sizeof(value)
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&& (*cur & 0x7fU) >= (1U << (8 * sizeof(value) - shift))) {
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cur = end + 1;
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break;
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}
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value |= (uleb128_t)(*cur & 0x7f) << shift;
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if (!(*cur++ & 0x80))
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break;
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}
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*pcur = cur;
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return value;
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}
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static sleb128_t get_sleb128(const u8 **pcur, const u8 *end)
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{
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const u8 *cur = *pcur;
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sleb128_t value;
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unsigned shift;
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for (shift = 0, value = 0; cur < end; shift += 7) {
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if (shift + 7 > 8 * sizeof(value)
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&& (*cur & 0x7fU) >= (1U << (8 * sizeof(value) - shift))) {
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cur = end + 1;
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break;
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}
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value |= (sleb128_t)(*cur & 0x7f) << shift;
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if (!(*cur & 0x80)) {
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value |= -(*cur++ & 0x40) << shift;
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break;
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}
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}
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*pcur = cur;
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return value;
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}
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static unsigned long read_pointer(const u8 **pLoc,
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const void *end,
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signed ptrType)
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{
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unsigned long value = 0;
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union {
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const u8 *p8;
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const u16 *p16u;
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const s16 *p16s;
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const u32 *p32u;
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const s32 *p32s;
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const unsigned long *pul;
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} ptr;
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if (ptrType < 0 || ptrType == DW_EH_PE_omit)
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return 0;
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ptr.p8 = *pLoc;
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switch(ptrType & DW_EH_PE_FORM) {
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case DW_EH_PE_data2:
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if (end < (const void *)(ptr.p16u + 1))
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return 0;
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if(ptrType & DW_EH_PE_signed)
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value = get_unaligned(ptr.p16s++);
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else
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value = get_unaligned(ptr.p16u++);
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break;
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case DW_EH_PE_data4:
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#ifdef CONFIG_64BIT
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if (end < (const void *)(ptr.p32u + 1))
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return 0;
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if(ptrType & DW_EH_PE_signed)
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value = get_unaligned(ptr.p32s++);
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else
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value = get_unaligned(ptr.p32u++);
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break;
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case DW_EH_PE_data8:
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BUILD_BUG_ON(sizeof(u64) != sizeof(value));
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#else
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BUILD_BUG_ON(sizeof(u32) != sizeof(value));
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#endif
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case DW_EH_PE_native:
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if (end < (const void *)(ptr.pul + 1))
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return 0;
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value = get_unaligned(ptr.pul++);
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break;
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case DW_EH_PE_leb128:
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BUILD_BUG_ON(sizeof(uleb128_t) > sizeof(value));
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value = ptrType & DW_EH_PE_signed
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? get_sleb128(&ptr.p8, end)
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: get_uleb128(&ptr.p8, end);
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if ((const void *)ptr.p8 > end)
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return 0;
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break;
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default:
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return 0;
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}
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switch(ptrType & DW_EH_PE_ADJUST) {
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case DW_EH_PE_abs:
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break;
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case DW_EH_PE_pcrel:
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value += (unsigned long)*pLoc;
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break;
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default:
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return 0;
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}
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/* TBD
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if ((ptrType & DW_EH_PE_indirect)
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&& __get_user(value, (unsigned long *)value))
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return 0;
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*/
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*pLoc = ptr.p8;
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return value;
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}
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static signed fde_pointer_type(const u32 *cie)
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{
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const u8 *ptr = (const u8 *)(cie + 2);
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unsigned version = *ptr;
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if (version != 1)
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return -1; /* unsupported */
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if (*++ptr) {
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const char *aug;
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const u8 *end = (const u8 *)(cie + 1) + *cie;
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uleb128_t len;
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/* check if augmentation size is first (and thus present) */
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if (*ptr != 'z')
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return -1;
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/* check if augmentation string is nul-terminated */
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if ((ptr = memchr(aug = (const void *)ptr, 0, end - ptr)) == NULL)
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return -1;
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++ptr; /* skip terminator */
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get_uleb128(&ptr, end); /* skip code alignment */
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get_sleb128(&ptr, end); /* skip data alignment */
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/* skip return address column */
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version <= 1 ? (void)++ptr : (void)get_uleb128(&ptr, end);
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len = get_uleb128(&ptr, end); /* augmentation length */
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if (ptr + len < ptr || ptr + len > end)
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return -1;
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end = ptr + len;
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while (*++aug) {
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if (ptr >= end)
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return -1;
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switch(*aug) {
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case 'L':
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++ptr;
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break;
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case 'P': {
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signed ptrType = *ptr++;
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if (!read_pointer(&ptr, end, ptrType) || ptr > end)
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return -1;
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}
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break;
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case 'R':
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return *ptr;
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default:
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return -1;
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}
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}
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}
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return DW_EH_PE_native|DW_EH_PE_abs;
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}
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static int advance_loc(unsigned long delta, struct unwind_state *state)
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{
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state->loc += delta * state->codeAlign;
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return delta > 0;
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}
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static void set_rule(uleb128_t reg,
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enum item_location where,
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uleb128_t value,
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struct unwind_state *state)
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{
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if (reg < ARRAY_SIZE(state->regs)) {
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state->regs[reg].where = where;
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state->regs[reg].value = value;
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}
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}
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static int processCFI(const u8 *start,
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const u8 *end,
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unsigned long targetLoc,
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signed ptrType,
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struct unwind_state *state)
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{
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union {
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const u8 *p8;
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const u16 *p16;
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const u32 *p32;
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} ptr;
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int result = 1;
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if (start != state->cieStart) {
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state->loc = state->org;
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result = processCFI(state->cieStart, state->cieEnd, 0, ptrType, state);
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if (targetLoc == 0 && state->label == NULL)
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return result;
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}
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for (ptr.p8 = start; result && ptr.p8 < end; ) {
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switch(*ptr.p8 >> 6) {
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uleb128_t value;
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case 0:
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switch(*ptr.p8++) {
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case DW_CFA_nop:
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break;
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case DW_CFA_set_loc:
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if ((state->loc = read_pointer(&ptr.p8, end,
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ptrType)) == 0)
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result = 0;
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break;
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case DW_CFA_advance_loc1:
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result = ptr.p8 < end && advance_loc(*ptr.p8++, state);
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break;
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case DW_CFA_advance_loc2:
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result = ptr.p8 <= end + 2
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&& advance_loc(*ptr.p16++, state);
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break;
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case DW_CFA_advance_loc4:
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result = ptr.p8 <= end + 4
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&& advance_loc(*ptr.p32++, state);
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break;
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case DW_CFA_offset_extended:
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value = get_uleb128(&ptr.p8, end);
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set_rule(value, Memory,
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get_uleb128(&ptr.p8, end), state);
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break;
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case DW_CFA_val_offset:
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value = get_uleb128(&ptr.p8, end);
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set_rule(value, Value,
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get_uleb128(&ptr.p8, end), state);
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break;
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case DW_CFA_offset_extended_sf:
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value = get_uleb128(&ptr.p8, end);
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set_rule(value, Memory,
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get_sleb128(&ptr.p8, end), state);
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break;
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case DW_CFA_val_offset_sf:
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value = get_uleb128(&ptr.p8, end);
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set_rule(value, Value,
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get_sleb128(&ptr.p8, end), state);
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break;
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case DW_CFA_restore_extended:
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case DW_CFA_undefined:
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case DW_CFA_same_value:
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set_rule(get_uleb128(&ptr.p8, end), Nowhere, 0, state);
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break;
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case DW_CFA_register:
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value = get_uleb128(&ptr.p8, end);
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set_rule(value, Register,
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get_uleb128(&ptr.p8, end), state);
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break;
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case DW_CFA_remember_state:
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if (ptr.p8 == state->label) {
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state->label = NULL;
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return 1;
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}
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if (state->stackDepth >= MAX_STACK_DEPTH)
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return 0;
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state->stack[state->stackDepth++] = ptr.p8;
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break;
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case DW_CFA_restore_state:
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if (state->stackDepth) {
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const uleb128_t loc = state->loc;
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const u8 *label = state->label;
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state->label = state->stack[state->stackDepth - 1];
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memcpy(&state->cfa, &badCFA, sizeof(state->cfa));
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memset(state->regs, 0, sizeof(state->regs));
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state->stackDepth = 0;
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result = processCFI(start, end, 0, ptrType, state);
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state->loc = loc;
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state->label = label;
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} else
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return 0;
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break;
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case DW_CFA_def_cfa:
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state->cfa.reg = get_uleb128(&ptr.p8, end);
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/*nobreak*/
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case DW_CFA_def_cfa_offset:
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state->cfa.offs = get_uleb128(&ptr.p8, end);
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break;
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case DW_CFA_def_cfa_sf:
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state->cfa.reg = get_uleb128(&ptr.p8, end);
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/*nobreak*/
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case DW_CFA_def_cfa_offset_sf:
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state->cfa.offs = get_sleb128(&ptr.p8, end)
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* state->dataAlign;
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break;
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case DW_CFA_def_cfa_register:
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state->cfa.reg = get_uleb128(&ptr.p8, end);
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break;
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/*todo case DW_CFA_def_cfa_expression: */
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/*todo case DW_CFA_expression: */
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/*todo case DW_CFA_val_expression: */
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case DW_CFA_GNU_args_size:
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get_uleb128(&ptr.p8, end);
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break;
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case DW_CFA_GNU_negative_offset_extended:
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value = get_uleb128(&ptr.p8, end);
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set_rule(value, Memory, (uleb128_t)0 -
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get_uleb128(&ptr.p8, end), state);
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break;
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case DW_CFA_GNU_window_save:
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default:
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result = 0;
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break;
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}
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break;
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case 1:
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result = advance_loc(*ptr.p8++ & 0x3f, state);
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break;
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case 2:
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value = *ptr.p8++ & 0x3f;
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set_rule(value, Memory, get_uleb128(&ptr.p8, end),
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state);
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break;
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case 3:
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set_rule(*ptr.p8++ & 0x3f, Nowhere, 0, state);
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break;
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}
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if (ptr.p8 > end)
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result = 0;
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if (result && targetLoc != 0 && targetLoc < state->loc)
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return 1;
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}
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return result
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&& ptr.p8 == end
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&& (targetLoc == 0
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|| (/*todo While in theory this should apply, gcc in practice omits
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everything past the function prolog, and hence the location
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never reaches the end of the function.
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targetLoc < state->loc &&*/ state->label == NULL));
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}
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|
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|
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/* Unwind to previous to frame. Returns 0 if successful, negative
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* number in case of an error. */
|
|
int
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unwind(struct unwind_frame_info *frame, int is_ehframe)
|
|
{
|
|
#define FRAME_REG(r, t) (((t *)frame)[reg_info[r].offs])
|
|
const u32 *fde = NULL, *cie = NULL;
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const u8 *ptr = NULL, *end = NULL;
|
|
unsigned long startLoc = 0, endLoc = 0, cfa;
|
|
unsigned i;
|
|
signed ptrType = -1;
|
|
uleb128_t retAddrReg = 0;
|
|
// struct unwind_table *table;
|
|
void *unwind_table;
|
|
struct local_unwind_table *table;
|
|
struct unwind_state state;
|
|
u64 reg_ptr = 0;
|
|
|
|
|
|
if (UNW_PC(frame) == 0)
|
|
return -EINVAL;
|
|
|
|
if ((table = find_table(UNW_PC(frame)))) {
|
|
// unsigned long tableSize = unwind_table_size;
|
|
unsigned long tableSize = table->size;
|
|
|
|
unwind_table = table->address;
|
|
|
|
for (fde = unwind_table;
|
|
tableSize > sizeof(*fde) && tableSize - sizeof(*fde) >= *fde;
|
|
tableSize -= sizeof(*fde) + *fde,
|
|
fde += 1 + *fde / sizeof(*fde)) {
|
|
if (!*fde || (*fde & (sizeof(*fde) - 1)))
|
|
break;
|
|
if (is_ehframe && !fde[1])
|
|
continue; /* this is a CIE */
|
|
else if (fde[1] == 0xffffffff)
|
|
continue; /* this is a CIE */
|
|
if ((fde[1] & (sizeof(*fde) - 1))
|
|
|| fde[1] > (unsigned long)(fde + 1)
|
|
- (unsigned long)unwind_table)
|
|
continue; /* this is not a valid FDE */
|
|
if (is_ehframe)
|
|
cie = fde + 1 - fde[1] / sizeof(*fde);
|
|
else
|
|
cie = unwind_table + fde[1];
|
|
if (*cie <= sizeof(*cie) + 4
|
|
|| *cie >= fde[1] - sizeof(*fde)
|
|
|| (*cie & (sizeof(*cie) - 1))
|
|
|| (cie[1] != 0xffffffff && cie[1])
|
|
|| (ptrType = fde_pointer_type(cie)) < 0) {
|
|
cie = NULL; /* this is not a (valid) CIE */
|
|
continue;
|
|
}
|
|
ptr = (const u8 *)(fde + 2);
|
|
startLoc = read_pointer(&ptr,
|
|
(const u8 *)(fde + 1) + *fde,
|
|
ptrType);
|
|
endLoc = startLoc
|
|
+ read_pointer(&ptr,
|
|
(const u8 *)(fde + 1) + *fde,
|
|
ptrType & DW_EH_PE_indirect
|
|
? ptrType
|
|
: ptrType & (DW_EH_PE_FORM|DW_EH_PE_signed));
|
|
if (UNW_PC(frame) >= startLoc && UNW_PC(frame) < endLoc)
|
|
break;
|
|
cie = NULL;
|
|
}
|
|
}
|
|
if (cie != NULL) {
|
|
memset(&state, 0, sizeof(state));
|
|
state.cieEnd = ptr; /* keep here temporarily */
|
|
ptr = (const u8 *)(cie + 2);
|
|
end = (const u8 *)(cie + 1) + *cie;
|
|
if ((state.version = *ptr) != 1)
|
|
cie = NULL; /* unsupported version */
|
|
else if (*++ptr) {
|
|
/* check if augmentation size is first (and thus present) */
|
|
if (*ptr == 'z') {
|
|
/* check for ignorable (or already handled)
|
|
* nul-terminated augmentation string */
|
|
while (++ptr < end && *ptr)
|
|
if (strchr("LPR", *ptr) == NULL)
|
|
break;
|
|
}
|
|
if (ptr >= end || *ptr)
|
|
cie = NULL;
|
|
}
|
|
++ptr;
|
|
}
|
|
if (cie != NULL) {
|
|
/* get code aligment factor */
|
|
state.codeAlign = get_uleb128(&ptr, end);
|
|
/* get data aligment factor */
|
|
state.dataAlign = get_sleb128(&ptr, end);
|
|
if (state.codeAlign == 0 || state.dataAlign == 0 || ptr >= end)
|
|
cie = NULL;
|
|
else {
|
|
retAddrReg = state.version <= 1 ? *ptr++ : get_uleb128(&ptr, end);
|
|
/* skip augmentation */
|
|
if (((const char *)(cie + 2))[1] == 'z')
|
|
ptr += get_uleb128(&ptr, end);
|
|
if (ptr > end
|
|
|| retAddrReg >= ARRAY_SIZE(reg_info)
|
|
|| REG_INVALID(retAddrReg)
|
|
|| reg_info[retAddrReg].width != sizeof(unsigned long))
|
|
cie = NULL;
|
|
}
|
|
}
|
|
if (cie != NULL) {
|
|
state.cieStart = ptr;
|
|
ptr = state.cieEnd;
|
|
state.cieEnd = end;
|
|
end = (const u8 *)(fde + 1) + *fde;
|
|
/* skip augmentation */
|
|
if (((const char *)(cie + 2))[1] == 'z') {
|
|
uleb128_t augSize = get_uleb128(&ptr, end);
|
|
|
|
if ((ptr += augSize) > end)
|
|
fde = NULL;
|
|
}
|
|
}
|
|
if (cie == NULL || fde == NULL)
|
|
return -ENXIO;
|
|
|
|
state.org = startLoc;
|
|
memcpy(&state.cfa, &badCFA, sizeof(state.cfa));
|
|
/* process instructions */
|
|
if (!processCFI(ptr, end, UNW_PC(frame), ptrType, &state)
|
|
|| state.loc > endLoc
|
|
|| state.regs[retAddrReg].where == Nowhere
|
|
|| state.cfa.reg >= ARRAY_SIZE(reg_info)
|
|
|| reg_info[state.cfa.reg].width != sizeof(unsigned long)
|
|
|| state.cfa.offs % sizeof(unsigned long)) {
|
|
return -EIO;
|
|
}
|
|
/* update frame */
|
|
cfa = FRAME_REG(state.cfa.reg, unsigned long) + state.cfa.offs;
|
|
startLoc = min((unsigned long)UNW_SP(frame), cfa);
|
|
endLoc = max((unsigned long)UNW_SP(frame), cfa);
|
|
if (STACK_LIMIT(startLoc) != STACK_LIMIT(endLoc)) {
|
|
startLoc = min(STACK_LIMIT(cfa), cfa);
|
|
endLoc = max(STACK_LIMIT(cfa), cfa);
|
|
}
|
|
#ifndef CONFIG_64BIT
|
|
# define CASES CASE(8); CASE(16); CASE(32)
|
|
#else
|
|
# define CASES CASE(8); CASE(16); CASE(32); CASE(64)
|
|
#endif
|
|
for (i = 0; i < ARRAY_SIZE(state.regs); ++i) {
|
|
if (REG_INVALID(i)) {
|
|
if (state.regs[i].where == Nowhere)
|
|
continue;
|
|
return -EIO;
|
|
}
|
|
switch(state.regs[i].where) {
|
|
default:
|
|
break;
|
|
case Register:
|
|
if (state.regs[i].value >= ARRAY_SIZE(reg_info)
|
|
|| REG_INVALID(state.regs[i].value)
|
|
|| reg_info[i].width > reg_info[state.regs[i].value].width){
|
|
return -EIO;
|
|
}
|
|
switch(reg_info[state.regs[i].value].width) {
|
|
#define CASE(n) \
|
|
case sizeof(u##n): \
|
|
state.regs[i].value = FRAME_REG(state.regs[i].value, \
|
|
const u##n); \
|
|
break
|
|
CASES;
|
|
#undef CASE
|
|
default:
|
|
return -EIO;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
for (i = 0; i < ARRAY_SIZE(state.regs); ++i) {
|
|
if (REG_INVALID(i))
|
|
continue;
|
|
switch(state.regs[i].where) {
|
|
case Nowhere:
|
|
if (reg_info[i].width != sizeof(UNW_SP(frame))
|
|
|| &FRAME_REG(i, __typeof__(UNW_SP(frame)))
|
|
!= &UNW_SP(frame))
|
|
continue;
|
|
UNW_SP(frame) = cfa;
|
|
break;
|
|
case Register:
|
|
switch(reg_info[i].width) {
|
|
#define CASE(n) case sizeof(u##n): \
|
|
FRAME_REG(i, u##n) = state.regs[i].value; \
|
|
break
|
|
CASES;
|
|
#undef CASE
|
|
default:
|
|
return -EIO;
|
|
}
|
|
break;
|
|
case Value:
|
|
if (reg_info[i].width != sizeof(unsigned long)){
|
|
return -EIO;}
|
|
FRAME_REG(i, unsigned long) = cfa + state.regs[i].value
|
|
* state.dataAlign;
|
|
break;
|
|
case Memory: {
|
|
unsigned long addr = cfa + state.regs[i].value
|
|
* state.dataAlign;
|
|
if ((state.regs[i].value * state.dataAlign)
|
|
% sizeof(unsigned long)
|
|
|| addr < startLoc
|
|
|| addr + sizeof(unsigned long) < addr
|
|
|| addr + sizeof(unsigned long) > endLoc){
|
|
return -EIO;}
|
|
switch(reg_info[i].width) {
|
|
#define CASE(n) case sizeof(u##n): \
|
|
readmem(addr, KVADDR, ®_ptr,sizeof(u##n), "register", RETURN_ON_ERROR|QUIET); \
|
|
FRAME_REG(i, u##n) = (u##n)reg_ptr;\
|
|
break
|
|
CASES;
|
|
#undef CASE
|
|
default:
|
|
return -EIO;
|
|
}
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
return 0;
|
|
#undef CASES
|
|
#undef FRAME_REG
|
|
}
|
|
|
|
/*
|
|
* Initialize the unwind table(s) in the best-case order:
|
|
*
|
|
* 1. Use the in-memory kernel and module unwind tables.
|
|
* 2. Use the in-memory kernel-only .eh_frame data. (possible?)
|
|
* 3. Use the kernel-only .eh_frame data from the vmlinux file.
|
|
*/
|
|
void
|
|
init_unwind_table(void)
|
|
{
|
|
ulong unwind_table_size;
|
|
void *unwind_table;
|
|
|
|
kt->flags &= ~DWARF_UNWIND;
|
|
|
|
if (gather_in_memory_unwind_tables()) {
|
|
if (CRASHDEBUG(1))
|
|
fprintf(fp, "init_unwind_table: DWARF_UNWIND_MEMORY (%d tables)\n",
|
|
unwind_tables_cnt);
|
|
|
|
kt->flags |= DWARF_UNWIND_MEMORY;
|
|
if (unwind_tables_cnt > 1)
|
|
kt->flags |= DWARF_UNWIND_MODULES;
|
|
if (!(kt->flags & NO_DWARF_UNWIND))
|
|
kt->flags |= DWARF_UNWIND;
|
|
|
|
return;
|
|
}
|
|
|
|
if (symbol_exists("__start_unwind") &&
|
|
symbol_exists("__end_unwind")) {
|
|
unwind_table_size = symbol_value("__end_unwind") -
|
|
symbol_value("__start_unwind");
|
|
|
|
if (!(unwind_table = malloc(unwind_table_size))) {
|
|
error(WARNING, "cannot malloc unwind table space\n");
|
|
goto try_eh_frame;
|
|
}
|
|
|
|
if (!readmem(symbol_value("__start_unwind"), KVADDR, unwind_table,
|
|
unwind_table_size, "unwind table", RETURN_ON_ERROR)) {
|
|
error(WARNING, "cannot read unwind table data\n");
|
|
free(unwind_table);
|
|
goto try_eh_frame;
|
|
}
|
|
|
|
kt->flags |= DWARF_UNWIND_MEMORY;
|
|
if (!(kt->flags & NO_DWARF_UNWIND))
|
|
kt->flags |= DWARF_UNWIND;
|
|
|
|
default_unwind_table.size = unwind_table_size;
|
|
default_unwind_table.address = unwind_table;
|
|
|
|
if (CRASHDEBUG(1))
|
|
fprintf(fp, "init_unwind_table: DWARF_UNWIND_MEMORY\n");
|
|
|
|
return;
|
|
}
|
|
|
|
try_eh_frame:
|
|
|
|
if (st->dwarf_eh_frame_size || st->dwarf_debug_frame_size) {
|
|
int fd;
|
|
int is_ehframe = (!st->dwarf_debug_frame_size &&
|
|
st->dwarf_eh_frame_size);
|
|
|
|
unwind_table_size = is_ehframe ? st->dwarf_eh_frame_size :
|
|
st->dwarf_debug_frame_size;
|
|
|
|
if (!(unwind_table = malloc(unwind_table_size))) {
|
|
error(WARNING, "cannot malloc unwind table space\n");
|
|
return;
|
|
}
|
|
|
|
if ((fd = open(pc->namelist, O_RDONLY)) < 0) {
|
|
error(WARNING, "cannot open %s for %s data\n",
|
|
pc->namelist, is_ehframe ? ".eh_frame" : ".debug_frame");
|
|
free(unwind_table);
|
|
return;
|
|
}
|
|
|
|
if (is_ehframe)
|
|
lseek(fd, st->dwarf_eh_frame_file_offset, SEEK_SET);
|
|
else
|
|
lseek(fd, st->dwarf_debug_frame_file_offset, SEEK_SET);
|
|
|
|
if (read(fd, unwind_table, unwind_table_size) !=
|
|
unwind_table_size) {
|
|
if (CRASHDEBUG(1))
|
|
error(WARNING, "cannot read %s data from %s\n",
|
|
is_ehframe ? ".eh_frame" : ".debug_frame", pc->namelist);
|
|
free(unwind_table);
|
|
return;
|
|
}
|
|
|
|
close(fd);
|
|
|
|
default_unwind_table.size = unwind_table_size;
|
|
default_unwind_table.address = unwind_table;
|
|
|
|
kt->flags |= DWARF_UNWIND_EH_FRAME;
|
|
if (!(kt->flags & NO_DWARF_UNWIND))
|
|
kt->flags |= DWARF_UNWIND;
|
|
|
|
if (CRASHDEBUG(1))
|
|
fprintf(fp, "init_unwind_table: DWARF_UNWIND_EH_FRAME\n");
|
|
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Find the appropriate kernel-only "root_table" unwind_table,
|
|
* and pass it to populate_local_tables() to do the heavy lifting.
|
|
*/
|
|
static int
|
|
gather_in_memory_unwind_tables(void)
|
|
{
|
|
int i, cnt, found;
|
|
struct syment *sp, *root_tables[10];
|
|
char *root_table_buf;
|
|
char buf[BUFSIZE];
|
|
ulong name;
|
|
|
|
STRUCT_SIZE_INIT(unwind_table, "unwind_table");
|
|
MEMBER_OFFSET_INIT(unwind_table_core, "unwind_table", "core");
|
|
MEMBER_OFFSET_INIT(unwind_table_init, "unwind_table", "init");
|
|
MEMBER_OFFSET_INIT(unwind_table_address, "unwind_table", "address");
|
|
MEMBER_OFFSET_INIT(unwind_table_size, "unwind_table", "size");
|
|
MEMBER_OFFSET_INIT(unwind_table_link, "unwind_table", "link");
|
|
MEMBER_OFFSET_INIT(unwind_table_name, "unwind_table", "name");
|
|
|
|
if (INVALID_SIZE(unwind_table) ||
|
|
INVALID_MEMBER(unwind_table_core) ||
|
|
INVALID_MEMBER(unwind_table_init) ||
|
|
INVALID_MEMBER(unwind_table_address) ||
|
|
INVALID_MEMBER(unwind_table_size) ||
|
|
INVALID_MEMBER(unwind_table_link) ||
|
|
INVALID_MEMBER(unwind_table_name)) {
|
|
if (CRASHDEBUG(1))
|
|
error(NOTE,
|
|
"unwind_table structure has changed, or does not exist in this kernel\n");
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Unfortunately there are two kernel root_table symbols.
|
|
*/
|
|
if (!(cnt = get_syment_array("root_table", root_tables, 10)))
|
|
return 0;
|
|
|
|
root_table_buf = GETBUF(SIZE(unwind_table));
|
|
for (i = found = 0; i < cnt; i++) {
|
|
sp = root_tables[i];
|
|
if (!readmem(sp->value, KVADDR, root_table_buf,
|
|
SIZE(unwind_table), "root unwind_table",
|
|
RETURN_ON_ERROR|QUIET))
|
|
goto gather_failed;
|
|
|
|
name = ULONG(root_table_buf + OFFSET(unwind_table_name));
|
|
if (read_string(name, buf, strlen("kernel")+1) &&
|
|
STREQ("kernel", buf)) {
|
|
found++;
|
|
if (CRASHDEBUG(1))
|
|
fprintf(fp, "root_table name: %lx [%s]\n",
|
|
name, buf);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (!found)
|
|
goto gather_failed;
|
|
|
|
cnt = populate_local_tables(sp->value, root_table_buf);
|
|
|
|
FREEBUF(root_table_buf);
|
|
return cnt;
|
|
|
|
gather_failed:
|
|
|
|
FREEBUF(root_table_buf);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Transfer the relevant data from the kernel and module unwind_table
|
|
* structures to the local_unwind_table structures.
|
|
*/
|
|
static int
|
|
populate_local_tables(ulong root, char *buf)
|
|
{
|
|
struct list_data list_data, *ld;
|
|
int i, cnt;
|
|
ulong *table_list;
|
|
ulong vaddr;
|
|
struct local_unwind_table *tp;
|
|
|
|
ld = &list_data;
|
|
BZERO(ld, sizeof(struct list_data));
|
|
ld->start = root;
|
|
ld->member_offset = OFFSET(unwind_table_link);
|
|
ld->flags = RETURN_ON_LIST_ERROR;
|
|
if (CRASHDEBUG(1))
|
|
ld->flags |= VERBOSE;
|
|
|
|
hq_open();
|
|
cnt = do_list(ld);
|
|
if (cnt == -1) {
|
|
error(WARNING, "UNWIND: failed to gather unwind_table list");
|
|
return 0;
|
|
}
|
|
table_list = (ulong *)GETBUF(cnt * sizeof(ulong));
|
|
cnt = retrieve_list(table_list, cnt);
|
|
hq_close();
|
|
|
|
if (!(local_unwind_tables =
|
|
malloc(sizeof(struct local_unwind_table) * cnt))) {
|
|
error(WARNING, "cannot malloc unwind_table space (%d tables)\n",
|
|
cnt);
|
|
FREEBUF(table_list);
|
|
return 0;
|
|
}
|
|
|
|
for (i = 0; i < cnt; i++, tp++) {
|
|
|
|
if (!readmem(table_list[i], KVADDR, buf,
|
|
SIZE(unwind_table), "unwind_table",
|
|
RETURN_ON_ERROR|QUIET)) {
|
|
error(WARNING, "cannot read unwind_table\n");
|
|
goto failed;
|
|
}
|
|
|
|
tp = &local_unwind_tables[i];
|
|
|
|
/*
|
|
* Copy the required table info for find_table().
|
|
*/
|
|
BCOPY(buf + OFFSET(unwind_table_core),
|
|
(char *)&tp->core.pc, sizeof(ulong)*2);
|
|
BCOPY(buf + OFFSET(unwind_table_init),
|
|
(char *)&tp->init.pc, sizeof(ulong)*2);
|
|
BCOPY(buf + OFFSET(unwind_table_size),
|
|
(char *)&tp->size, sizeof(ulong));
|
|
|
|
/*
|
|
* Then read the DWARF CFI data.
|
|
*/
|
|
vaddr = ULONG(buf + OFFSET(unwind_table_address));
|
|
|
|
if (!(tp->address = malloc(tp->size))) {
|
|
error(WARNING, "cannot malloc unwind_table space\n");
|
|
goto failed;
|
|
break;
|
|
}
|
|
if (!readmem(vaddr, KVADDR, tp->address,
|
|
tp->size, "DWARF CFI data", RETURN_ON_ERROR|QUIET)) {
|
|
error(WARNING, "cannot read unwind_table data\n");
|
|
goto failed;
|
|
}
|
|
}
|
|
|
|
unwind_tables_cnt = cnt;
|
|
|
|
if (CRASHDEBUG(7))
|
|
dump_local_unwind_tables();
|
|
|
|
failed:
|
|
|
|
FREEBUF(table_list);
|
|
return unwind_tables_cnt;
|
|
}
|
|
|
|
/*
|
|
* Find the unwind_table containing a pc.
|
|
*/
|
|
static struct local_unwind_table *
|
|
find_table(unsigned long pc)
|
|
{
|
|
int i;
|
|
struct local_unwind_table *tp, *table;
|
|
|
|
table = &default_unwind_table;
|
|
|
|
for (i = 0; i < unwind_tables_cnt; i++, tp++) {
|
|
tp = &local_unwind_tables[i];
|
|
if ((pc >= tp->core.pc
|
|
&& pc < tp->core.pc + tp->core.range)
|
|
|| (pc >= tp->init.pc
|
|
&& pc < tp->init.pc + tp->init.range)) {
|
|
table = tp;
|
|
break;
|
|
}
|
|
}
|
|
|
|
return table;
|
|
}
|
|
|
|
static void
|
|
dump_local_unwind_tables(void)
|
|
{
|
|
int i, others;
|
|
struct local_unwind_table *tp;
|
|
|
|
others = 0;
|
|
fprintf(fp, "DWARF flags: (");
|
|
if (kt->flags & DWARF_UNWIND)
|
|
fprintf(fp, "%sDWARF_UNWIND", others++ ? "|" : "");
|
|
if (kt->flags & NO_DWARF_UNWIND)
|
|
fprintf(fp, "%sNO_DWARF_UNWIND", others++ ? "|" : "");
|
|
if (kt->flags & DWARF_UNWIND_MEMORY)
|
|
fprintf(fp, "%sDWARF_UNWIND_MEMORY", others++ ? "|" : "");
|
|
if (kt->flags & DWARF_UNWIND_EH_FRAME)
|
|
fprintf(fp, "%sDWARF_UNWIND_EH_FRAME", others++ ? "|" : "");
|
|
if (kt->flags & DWARF_UNWIND_MODULES)
|
|
fprintf(fp, "%sDWARF_UNWIND_MODULES", others++ ? "|" : "");
|
|
fprintf(fp, ")\n\n");
|
|
|
|
fprintf(fp, "default_unwind_table:\n");
|
|
fprintf(fp, " address: %lx\n",
|
|
(ulong)default_unwind_table.address);
|
|
fprintf(fp, " size: %ld\n\n",
|
|
(ulong)default_unwind_table.size);
|
|
|
|
fprintf(fp, "local_unwind_tables[%d]:\n", unwind_tables_cnt);
|
|
for (i = 0; i < unwind_tables_cnt; i++, tp++) {
|
|
tp = &local_unwind_tables[i];
|
|
fprintf(fp, "[%d]\n", i);
|
|
fprintf(fp, " core: pc: %lx\n", tp->core.pc);
|
|
fprintf(fp, " range: %ld\n", tp->core.range);
|
|
fprintf(fp, " init: pc: %lx\n", tp->init.pc);
|
|
fprintf(fp, " range: %ld\n", tp->init.range);
|
|
fprintf(fp, " address: %lx\n", (ulong)tp->address);
|
|
fprintf(fp, " size: %ld\n", tp->size);
|
|
}
|
|
}
|
|
|
|
|
|
int
|
|
dwarf_backtrace(struct bt_info *bt, int level, ulong stacktop)
|
|
{
|
|
unsigned long bp, offset;
|
|
struct syment *sp;
|
|
char *name;
|
|
struct unwind_frame_info *frame;
|
|
int is_ehframe = (!st->dwarf_debug_frame_size && st->dwarf_eh_frame_size);
|
|
|
|
frame = (struct unwind_frame_info *)GETBUF(sizeof(struct unwind_frame_info));
|
|
// frame->regs.rsp = bt->stkptr;
|
|
// frame->regs.rip = bt->instptr;
|
|
UNW_SP(frame) = bt->stkptr;
|
|
UNW_PC(frame) = bt->instptr;
|
|
|
|
/* read rbp from stack for non active tasks */
|
|
if (!(bt->flags & BT_DUMPFILE_SEARCH) && !bt->bptr) {
|
|
// readmem(frame->regs.rsp, KVADDR, &bp,
|
|
readmem(UNW_SP(frame), KVADDR, &bp,
|
|
sizeof(unsigned long), "reading bp", FAULT_ON_ERROR);
|
|
frame->regs.rbp = bp; /* fixme for x86 */
|
|
}
|
|
|
|
sp = value_search(UNW_PC(frame), &offset);
|
|
if (!sp) {
|
|
if (CRASHDEBUG(1))
|
|
fprintf(fp, "unwind: cannot find symbol for PC: %lx\n",
|
|
UNW_PC(frame));
|
|
goto bailout;
|
|
}
|
|
|
|
/*
|
|
* If offset is zero, it means we have crossed over to the next
|
|
* function. Recalculate by adjusting the text address
|
|
*/
|
|
if (!offset) {
|
|
sp = value_search(UNW_PC(frame) - 1, &offset);
|
|
if (!sp) {
|
|
if (CRASHDEBUG(1))
|
|
fprintf(fp,
|
|
"unwind: cannot find symbol for PC: %lx\n",
|
|
UNW_PC(frame)-1);
|
|
goto bailout;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
name = sp->name;
|
|
fprintf(fp, " #%d [%016lx] %s at %016lx \n", level, UNW_SP(frame), name, UNW_PC(frame));
|
|
|
|
if (CRASHDEBUG(2))
|
|
fprintf(fp, " < SP: %lx PC: %lx FP: %lx >\n", UNW_SP(frame),
|
|
UNW_PC(frame), frame->regs.rbp);
|
|
|
|
while ((UNW_SP(frame) < stacktop)
|
|
&& !unwind(frame, is_ehframe) && UNW_PC(frame)) {
|
|
/* To prevent rip pushed on IRQ stack being reported both
|
|
* both on the IRQ and process stacks
|
|
*/
|
|
if ((bt->flags & BT_IRQSTACK) && (UNW_SP(frame) >= stacktop - 16))
|
|
break;
|
|
level++;
|
|
sp = value_search(UNW_PC(frame), &offset);
|
|
if (!sp) {
|
|
if (CRASHDEBUG(1))
|
|
fprintf(fp,
|
|
"unwind: cannot find symbol for PC: %lx\n",
|
|
UNW_PC(frame));
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* If offset is zero, it means we have crossed over to the next
|
|
* function. Recalculate by adjusting the text address
|
|
*/
|
|
if (!offset) {
|
|
sp = value_search(UNW_PC(frame) - 1, &offset);
|
|
if (!sp) {
|
|
if (CRASHDEBUG(1))
|
|
fprintf(fp,
|
|
"unwind: cannot find symbol for PC: %lx\n",
|
|
UNW_PC(frame)-1);
|
|
goto bailout;
|
|
}
|
|
}
|
|
name = sp->name;
|
|
fprintf(fp, "%s#%d [%016lx] %s at %016lx \n", level < 10 ? " " : "",
|
|
level, UNW_SP(frame), name, UNW_PC(frame));
|
|
|
|
if (CRASHDEBUG(2))
|
|
fprintf(fp, " < SP: %lx PC: %lx FP: %lx >\n", UNW_SP(frame),
|
|
UNW_PC(frame), frame->regs.rbp);
|
|
}
|
|
|
|
bailout:
|
|
FREEBUF(frame);
|
|
return ++level;
|
|
}
|
|
|
|
int
|
|
dwarf_print_stack_entry(struct bt_info *bt, int level)
|
|
{
|
|
unsigned long offset;
|
|
struct syment *sp;
|
|
char *name;
|
|
struct unwind_frame_info *frame;
|
|
|
|
frame = (struct unwind_frame_info *)GETBUF(sizeof(struct unwind_frame_info));
|
|
UNW_SP(frame) = bt->stkptr;
|
|
UNW_PC(frame) = bt->instptr;
|
|
|
|
sp = value_search(UNW_PC(frame), &offset);
|
|
if (!sp) {
|
|
if (CRASHDEBUG(1))
|
|
fprintf(fp, "unwind: cannot find symbol for PC: %lx\n",
|
|
UNW_PC(frame));
|
|
goto bailout;
|
|
}
|
|
|
|
/*
|
|
* If offset is zero, it means we have crossed over to the next
|
|
* function. Recalculate by adjusting the text address
|
|
*/
|
|
if (!offset) {
|
|
sp = value_search(UNW_PC(frame) - 1, &offset);
|
|
if (!sp) {
|
|
if (CRASHDEBUG(1))
|
|
fprintf(fp,
|
|
"unwind: cannot find symbol for PC: %lx\n",
|
|
UNW_PC(frame)-1);
|
|
goto bailout;
|
|
}
|
|
}
|
|
name = sp->name;
|
|
fprintf(fp, " #%d [%016lx] %s at %016lx \n", level, UNW_SP(frame), name, UNW_PC(frame));
|
|
|
|
bailout:
|
|
FREEBUF(frame);
|
|
return level;
|
|
}
|
|
|
|
void
|
|
dwarf_debug(struct bt_info *bt)
|
|
{
|
|
struct unwind_frame_info *frame;
|
|
ulong bp;
|
|
int is_ehframe = (!st->dwarf_debug_frame_size && st->dwarf_eh_frame_size);
|
|
|
|
if (!bt->hp->eip) {
|
|
dump_local_unwind_tables();
|
|
return;
|
|
}
|
|
|
|
if (!(kt->flags & DWARF_UNWIND_CAPABLE)) {
|
|
error(INFO, "not DWARF capable\n");
|
|
return;
|
|
}
|
|
|
|
frame = (struct unwind_frame_info *)GETBUF(sizeof(struct unwind_frame_info));
|
|
|
|
/*
|
|
* XXX: This only works for the first PC/SP pair seen in a normal
|
|
* backtrace, so it's not particularly helpful. Ideally it should
|
|
* be capable to take any PC/SP pair in a stack, but it appears to
|
|
* related to the rbp value.
|
|
*/
|
|
|
|
UNW_PC(frame) = bt->hp->eip;
|
|
UNW_SP(frame) = bt->hp->esp;
|
|
|
|
readmem(UNW_SP(frame), KVADDR, &bp,
|
|
sizeof(unsigned long), "reading bp", FAULT_ON_ERROR);
|
|
frame->regs.rbp = bp; /* fixme for x86 */
|
|
|
|
unwind(frame, is_ehframe);
|
|
|
|
fprintf(fp, "frame size: %lx (%lx)\n",
|
|
(ulong)UNW_SP(frame), (ulong)UNW_SP(frame) - bt->hp->esp);
|
|
|
|
FREEBUF(frame);
|
|
}
|
|
|
|
|
|
#endif
|