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od-macho: dump compact unwind info.

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binutils/
	* od-macho.c (dump_section_header): Renames of dump_section.
	(dump_segment): Adjust after renaming.
	(OPT_COMPACT_UNWIND): Define.
	(options): Add compact unwind.
	(mach_o_help): Document compact_unwind.
	(unwind_x86_64_regs, unwind_x86_regs): New arrays.
	(dump_unwind_encoding_x86, dump_unwind_encoding)
	(dump_obj_compact_unwind, dump_exe_compact_unwind)
	(dump_section_content): New functions.
	(mach_o_dump): Handle compact unwind.

include/mach-o/
	* unwind.h: New file.
This commit is contained in:
Tristan Gingold 2014-03-17 09:46:36 +01:00
parent fbe383b9ee
commit 167e1c1f1f
4 changed files with 660 additions and 2 deletions
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13
binutils/ChangeLog
View file

@ -1,3 +1,16 @@
2014-03-17 Tristan Gingold <gingold@adacore.com>
* od-macho.c (dump_section_header): Renames of dump_section.
(dump_segment): Adjust after renaming.
(OPT_COMPACT_UNWIND): Define.
(options): Add compact unwind.
(mach_o_help): Document compact_unwind.
(unwind_x86_64_regs, unwind_x86_regs): New arrays.
(dump_unwind_encoding_x86, dump_unwind_encoding)
(dump_obj_compact_unwind, dump_exe_compact_unwind)
(dump_section_content): New functions.
(mach_o_dump): Handle compact unwind.
2014-03-17 Tristan Gingold <gingold@adacore.com>
* od-macho.c (dump_load_command): Handle lazy load dylib.

446
binutils/od-macho.c
View file

@ -31,6 +31,7 @@
#include "mach-o.h"
#include "mach-o/external.h"
#include "mach-o/codesign.h"
#include "mach-o/unwind.h"
/* Index of the options in the options[] array. */
#define OPT_HEADER 0
@ -40,6 +41,7 @@
#define OPT_DYSYMTAB 4
#define OPT_CODESIGN 5
#define OPT_SEG_SPLIT_INFO 6
#define OPT_COMPACT_UNWIND 7
/* List of actions. */
static struct objdump_private_option options[] =
@ -51,6 +53,7 @@ static struct objdump_private_option options[] =
{ "dysymtab", 0 },
{ "codesign", 0 },
{ "seg_split_info", 0 },
{ "compact_unwind", 0 },
{ NULL, 0 }
};
@ -68,6 +71,7 @@ For Mach-O files:\n\
dysymtab Display the dynamic symbol table\n\
codesign Display code signature\n\
seg_split_info Display segment split info\n\
compact_unwind Display compact unwinding info\n\
"));
}
@ -322,7 +326,7 @@ dump_section_map (bfd *abfd)
}
static void
dump_section (bfd *abfd ATTRIBUTE_UNUSED, bfd_mach_o_section *sec)
dump_section_header (bfd *abfd ATTRIBUTE_UNUSED, bfd_mach_o_section *sec)
{
printf (" Section: %-16s %-16s (bfdname: %s)\n",
sec->sectname, sec->segname, sec->bfdsection->name);
@ -391,7 +395,7 @@ dump_segment (bfd *abfd ATTRIBUTE_UNUSED, bfd_mach_o_load_command *cmd)
printf (" nsects: %lu ", seg->nsects);
printf (" flags: %lx\n", seg->flags);
for (sec = seg->sect_head; sec != NULL; sec = sec->next)
dump_section (abfd, sec);
dump_section_header (abfd, sec);
}
static void
@ -1088,6 +1092,437 @@ dump_load_commands (bfd *abfd, unsigned int cmd32, unsigned int cmd64)
}
}
static const char * const unwind_x86_64_regs[] =
{"", "rbx", "r12", "r13", "r14", "r15", "rbp", "???" };
static const char * const unwind_x86_regs[] =
{"", "ebx", "ecx", "edx", "edi", "edi", "ebp", "???" };
/* Dump x86 or x86-64 compact unwind encoding. Works for both architecture,
as the encoding is the same (but not register names). */
static void
dump_unwind_encoding_x86 (unsigned int encoding, unsigned int sz,
const char * const regs_name[])
{
unsigned int mode;
mode = encoding & MACH_O_UNWIND_X86_64_MODE_MASK;
switch (mode)
{
case MACH_O_UNWIND_X86_64_MODE_RBP_FRAME:
{
unsigned int regs;
char pfx = sz == 8 ? 'R' : 'E';
regs = encoding & MACH_O_UNWIND_X86_64_RBP_FRAME_REGSITERS;
printf (" %cSP frame", pfx);
if (regs != 0)
{
unsigned int offset;
int i;
offset = (encoding & MACH_O_UNWIND_X86_64_RBP_FRAME_OFFSET) >> 16;
printf (" at %cBP-%u:", pfx, offset * sz);
for (i = 0; i < 5; i++)
{
unsigned int reg = (regs >> (i * 3)) & 0x7;
if (reg != MACH_O_UNWIND_X86_64_REG_NONE)
printf (" %s", regs_name[reg]);
}
}
}
break;
case MACH_O_UNWIND_X86_64_MODE_STACK_IMMD:
case MACH_O_UNWIND_X86_64_MODE_STACK_IND:
{
unsigned int stack_size;
unsigned int reg_count;
unsigned int reg_perm;
unsigned int regs[6];
int i, j;
printf (" frameless");
stack_size =
(encoding & MACH_O_UNWIND_X86_64_FRAMELESS_STACK_SIZE) >> 16;
reg_count =
(encoding & MACH_O_UNWIND_X86_64_FRAMELESS_REG_COUNT) >> 10;
reg_perm = encoding & MACH_O_UNWIND_X86_64_FRAMELESS_REG_PERMUTATION;
if (mode == MACH_O_UNWIND_X86_64_MODE_STACK_IMMD)
printf (" size: 0x%03x", stack_size * sz);
else
{
unsigned int stack_adj;
stack_adj =
(encoding & MACH_O_UNWIND_X86_64_FRAMELESS_STACK_ADJUST) >> 13;
printf (" size at 0x%03x + 0x%02x", stack_size, stack_adj);
}
/* Registers are coded using arithmetic compression: the register
is indexed in range 0-6, the second in range 0-5, the third in
range 0-4, etc. Already used registers are removed in next
ranges. */
#define DO_PERM(R, NUM) R = reg_perm / NUM; reg_perm -= R * NUM
switch (reg_count)
{
case 6:
case 5:
DO_PERM (regs[0], 120);
DO_PERM (regs[1], 24);
DO_PERM (regs[2], 6);
DO_PERM (regs[3], 2);
DO_PERM (regs[4], 1);
regs[5] = 0; /* Not used if reg_count = 5. */
break;
case 4:
DO_PERM (regs[0], 60);
DO_PERM (regs[1], 12);
DO_PERM (regs[2], 3);
DO_PERM (regs[3], 1);
break;
case 3:
DO_PERM (regs[0], 20);
DO_PERM (regs[1], 4);
DO_PERM (regs[2], 1);
break;
case 2:
DO_PERM (regs[0], 5);
DO_PERM (regs[1], 1);
break;
case 1:
DO_PERM (regs[0], 1);
break;
case 0:
break;
default:
printf (" [bad reg count]");
return;
}
#undef DO_PERM
/* Renumber. */
for (i = reg_count - 1; i >= 0; i--)
{
unsigned int inc = 1;
for (j = 0; j < i; j++)
if (regs[i] >= regs[j])
inc++;
regs[i] += inc;
}
/* Display. */
for (i = 0; i < (int) reg_count; i++)
printf (" %s", regs_name[regs[i]]);
}
break;
case MACH_O_UNWIND_X86_64_MODE_DWARF:
printf (" Dwarf offset: 0x%06x",
encoding & MACH_O_UNWIND_X86_64_DWARF_SECTION_OFFSET);
break;
default:
printf (" [unhandled mode]");
break;
}
}
static void
dump_unwind_encoding (bfd_mach_o_data_struct *mdata, unsigned int encoding)
{
printf ("0x%08x", encoding);
if (encoding == 0)
return;
switch (mdata->header.cputype)
{
case BFD_MACH_O_CPU_TYPE_X86_64:
dump_unwind_encoding_x86 (encoding, 8, unwind_x86_64_regs);
break;
case BFD_MACH_O_CPU_TYPE_I386:
dump_unwind_encoding_x86 (encoding, 4, unwind_x86_regs);
break;
default:
printf (" [unhandled cpu]");
break;
}
if (encoding & MACH_O_UNWIND_HAS_LSDA)
printf (" LSDA");
if (encoding & MACH_O_UNWIND_PERSONALITY_MASK)
printf (" PERS(%u)",
((encoding & MACH_O_UNWIND_PERSONALITY_MASK)
>> MACH_O_UNWIND_PERSONALITY_SHIFT));
}
static void
dump_obj_compact_unwind (bfd *abfd,
const unsigned char *content, bfd_size_type size)
{
bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
int is_64 = mdata->header.version == 2;
const unsigned char *p;
printf (" compact unwind info:\n");
printf (" start length personality lsda\n");
if (is_64)
{
struct mach_o_compact_unwind_64 *e =
(struct mach_o_compact_unwind_64 *) content;
for (p = content; p < content + size; p += sizeof (*e))
{
e = (struct mach_o_compact_unwind_64 *) p;
putchar (' ');
fprintf_vma (stdout, bfd_get_64 (abfd, e->start));
printf (" %08lx", bfd_get_32 (abfd, e->length));
putchar (' ');
fprintf_vma (stdout, bfd_get_64 (abfd, e->personnality));
putchar (' ');
fprintf_vma (stdout, bfd_get_64 (abfd, e->lsda));
putchar ('\n');
printf (" encoding: ");
dump_unwind_encoding (mdata, bfd_get_32 (abfd, e->encoding));
putchar ('\n');
}
}
else
{
printf ("unhandled\n");
}
}
static void
dump_exe_compact_unwind (bfd *abfd,
const unsigned char *content, bfd_size_type size)
{
bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
struct mach_o_unwind_info_header *hdr;
unsigned int version;
unsigned int encodings_offset;
unsigned int encodings_count;
unsigned int personality_offset;
unsigned int personality_count;
unsigned int index_offset;
unsigned int index_count;
struct mach_o_unwind_index_entry *index_entry;
unsigned int i;
/* The header. */
printf (" compact unwind info:\n");
hdr = (struct mach_o_unwind_info_header *) content;
if (size < sizeof (*hdr))
{
printf (" truncated!\n");
return;
}
version = bfd_get_32 (abfd, hdr->version);
if (version != MACH_O_UNWIND_SECTION_VERSION)
{
printf (" unknown version: %u\n", version);
return;
}
encodings_offset = bfd_get_32 (abfd, hdr->encodings_array_offset);
encodings_count = bfd_get_32 (abfd, hdr->encodings_array_count);
personality_offset = bfd_get_32 (abfd, hdr->personality_array_offset);
personality_count = bfd_get_32 (abfd, hdr->personality_array_count);
index_offset = bfd_get_32 (abfd, hdr->index_offset);
index_count = bfd_get_32 (abfd, hdr->index_count);
printf (" %u encodings, %u personalities, %u level-1 indexes:\n",
encodings_count, personality_count, index_count);
/* Level-1 index. */
printf (" idx function level2 off lsda off\n");
index_entry = (struct mach_o_unwind_index_entry *) (content + index_offset);
for (i = 0; i < index_count; i++)
{
unsigned int func_offset;
unsigned int level2_offset;
unsigned int lsda_offset;
func_offset = bfd_get_32 (abfd, index_entry->function_offset);
level2_offset = bfd_get_32 (abfd, index_entry->second_level_offset);
lsda_offset = bfd_get_32 (abfd, index_entry->lsda_index_offset);
printf (" %3u 0x%08x 0x%08x 0x%08x\n",
i, func_offset, level2_offset, lsda_offset);
index_entry++;
}
/* Level-1 index. */
index_entry = (struct mach_o_unwind_index_entry *) (content + index_offset);
for (i = 0; i < index_count; i++)
{
unsigned int func_offset;
unsigned int level2_offset;
const unsigned char *level2;
unsigned int kind;
if (i == index_count - 1)
break;
func_offset = bfd_get_32 (abfd, index_entry->function_offset);
level2_offset = bfd_get_32 (abfd, index_entry->second_level_offset);
level2 = content + level2_offset;
kind = bfd_get_32 (abfd, level2);
switch (kind)
{
case MACH_O_UNWIND_SECOND_LEVEL_COMPRESSED:
{
struct mach_o_unwind_compressed_second_level_page_header *l2;
unsigned int entry_offset;
unsigned int entry_count;
unsigned int l2_encodings_offset;
unsigned int l2_encodings_count;
const unsigned char *en;
unsigned int j;
l2 = (struct mach_o_unwind_compressed_second_level_page_header *)
level2;
entry_offset = bfd_get_16 (abfd, l2->entry_page_offset);
entry_count = bfd_get_16 (abfd, l2->entry_count);
l2_encodings_offset = bfd_get_16 (abfd, l2->encodings_offset);
l2_encodings_count = bfd_get_16 (abfd, l2->encodings_count);
printf (" index %2u: compressed second level: "
"%u entries, %u encodings (at 0x%08x)\n",
i, entry_count, l2_encodings_count, l2_encodings_offset);
printf (" # function eidx encoding\n");
en = level2 + entry_offset;
for (j = 0; j < entry_count; j++)
{
unsigned int entry;
unsigned int en_func;
unsigned int enc_idx;
unsigned int encoding;
const unsigned char *enc_addr;
entry = bfd_get_32 (abfd, en);
en_func =
MACH_O_UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET (entry);
enc_idx =
MACH_O_UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX (entry);
if (enc_idx < encodings_count)
enc_addr = content + encodings_offset
+ 4 * enc_idx;
else
enc_addr = level2 + l2_encodings_offset
+ 4 * (enc_idx - encodings_count);
encoding = bfd_get_32 (abfd, enc_addr);
printf (" %-4u 0x%08x [%3u] ", j,
func_offset + en_func, enc_idx);
dump_unwind_encoding (mdata, encoding);
putchar ('\n');
en += 4;
}
}
break;
case MACH_O_UNWIND_SECOND_LEVEL_REGULAR:
{
struct mach_o_unwind_regular_second_level_page_header *l2;
struct mach_o_unwind_regular_second_level_entry *en;
unsigned int entry_offset;
unsigned int entry_count;
unsigned int j;
l2 = (struct mach_o_unwind_regular_second_level_page_header *)
level2;
entry_offset = bfd_get_16 (abfd, l2->entry_page_offset);
entry_count = bfd_get_16 (abfd, l2->entry_count);
printf (" index %2u: regular level 2 at 0x%04x, %u entries\n",
i, entry_offset, entry_count);
printf (" # function encoding\n");
en = (struct mach_o_unwind_regular_second_level_entry *)
(level2 + entry_offset);
for (j = 0; j < entry_count; j++)
{
unsigned int en_func;
unsigned int encoding;
en_func = bfd_get_32 (abfd, en->function_offset);
encoding = bfd_get_32 (abfd, en->encoding);
printf (" %-4u 0x%08x ", j, en_func);
dump_unwind_encoding (mdata, encoding);
putchar ('\n');
en++;
}
}
break;
default:
printf (" index %2u: unhandled second level format (%u)\n",
i, kind);
break;
}
{
struct mach_o_unwind_lsda_index_entry *lsda;
unsigned int lsda_offset;
unsigned int next_lsda_offset;
unsigned int nbr_lsda;
unsigned int j;
lsda_offset = bfd_get_32 (abfd, index_entry->lsda_index_offset);
next_lsda_offset = bfd_get_32 (abfd, index_entry[1].lsda_index_offset);
lsda = (struct mach_o_unwind_lsda_index_entry *)
(content + lsda_offset);
nbr_lsda = (next_lsda_offset - lsda_offset) / sizeof (*lsda);
for (j = 0; j < nbr_lsda; j++)
{
printf (" lsda %-3u: function 0x%08x lsda 0x%08x\n",
j, (unsigned int) bfd_get_32 (abfd, lsda->function_offset),
(unsigned int) bfd_get_32 (abfd, lsda->lsda_offset));
lsda++;
}
}
index_entry++;
}
}
static void
dump_section_content (bfd *abfd,
const char *segname, const char *sectname,
void (*dump)(bfd*, const unsigned char*, bfd_size_type))
{
bfd_mach_o_data_struct *mdata = bfd_mach_o_get_data (abfd);
unsigned int i;
for (i = 0; i < mdata->header.ncmds; i++)
{
bfd_mach_o_load_command *cmd = &mdata->commands[i];
if (cmd->type == BFD_MACH_O_LC_SEGMENT
|| cmd->type == BFD_MACH_O_LC_SEGMENT_64)
{
bfd_mach_o_segment_command *seg = &cmd->command.segment;
bfd_mach_o_section *sec;
for (sec = seg->sect_head; sec != NULL; sec = sec->next)
if (strcmp (sec->segname, segname) == 0
&& strcmp (sec->sectname, sectname) == 0)
{
bfd_size_type size;
asection *bfdsec = sec->bfdsection;
unsigned char *content;
size = bfd_get_section_size (bfdsec);
content = (unsigned char *) xmalloc (size);
bfd_get_section_contents (abfd, bfdsec, content, 0, size);
(*dump)(abfd, content, size);
free (content);
}
}
}
}
/* Dump ABFD (according to the options[] array). */
static void
@ -1107,6 +1542,13 @@ mach_o_dump (bfd *abfd)
dump_load_commands (abfd, BFD_MACH_O_LC_CODE_SIGNATURE, 0);
if (options[OPT_SEG_SPLIT_INFO].selected)
dump_load_commands (abfd, BFD_MACH_O_LC_SEGMENT_SPLIT_INFO, 0);
if (options[OPT_COMPACT_UNWIND].selected)
{
dump_section_content (abfd, "__LD", "__compact_unwind",
dump_obj_compact_unwind);
dump_section_content (abfd, "__TEXT", "__unwind_info",
dump_exe_compact_unwind);
}
}
/* Vector for Mach-O. */

4
include/mach-o/ChangeLog
View file

@ -1,3 +1,7 @@
2014-03-17 Tristan Gingold <gingold@adacore.com>
* unwind.h: New file.
2014-03-05 Alan Modra <amodra@gmail.com>
Update copyright years.

199
include/mach-o/unwind.h Normal file
View file

@ -0,0 +1,199 @@
/* Mach-O compact unwind encoding.
Copyright (C) 2014 Free Software Foundation, Inc.
This file is part of BFD, the Binary File Descriptor library.
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 3 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.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
MA 02110-1301, USA. */
#ifndef _MACH_O_UNWIND_H
#define _MACH_O_UNWIND_H
/* Encodings bits for all cpus. */
#define MACH_O_UNWIND_IS_NOT_FUNCTION_START 0x80000000
#define MACH_O_UNWIND_HAS_LSDA 0x40000000
#define MACH_O_UNWIND_PERSONALITY_MASK 0x30000000
#define MACH_O_UNWIND_PERSONALITY_SHIFT 28
/* Encodings for x86-64. */
/* Kind of encoding (4 bits). */
#define MACH_O_UNWIND_X86_64_MODE_MASK 0x0f000000
/* Frame is RBP based, using the standard sequence: push %rbp; mov %rsp, %rbp.
Non-volatile registers must be saved in the stack starting at %rbp-8 to
%rbp-2040 (offset is encoded in offset bits * 8). Registers saved are
encoded in registers bits, 3 bits per register. */
#define MACH_O_UNWIND_X86_64_MODE_RBP_FRAME 0x01000000
#define MACH_O_UNWIND_X86_64_RBP_FRAME_REGSITERS 0x00007FFF
#define MACH_O_UNWIND_X86_64_RBP_FRAME_OFFSET 0x00FF0000
/* Frameless function, with a small stack size. */
#define MACH_O_UNWIND_X86_64_MODE_STACK_IMMD 0x02000000
#define MACH_O_UNWIND_X86_64_FRAMELESS_STACK_SIZE 0x00FF0000
#define MACH_O_UNWIND_X86_64_FRAMELESS_REG_COUNT 0x00001C00
#define MACH_O_UNWIND_X86_64_FRAMELESS_REG_PERMUTATION 0x000003FF
/* Frameless function, with a larger stack size. The stack size is the sum
of the X in subq $X,%rsp (address of X is at function + stack size bits)
and stack adjust. */
#define MACH_O_UNWIND_X86_64_MODE_STACK_IND 0x03000000
#define MACH_O_UNWIND_X86_64_FRAMELESS_STACK_ADJUST 0x0000E000
/* Use dwarf. */
#define MACH_O_UNWIND_X86_64_MODE_DWARF 0x04000000
#define MACH_O_UNWIND_X86_64_DWARF_SECTION_OFFSET 0x00ffffff
/* Registers. */
#define MACH_O_UNWIND_X86_64_REG_NONE 0
#define MACH_O_UNWIND_X86_64_REG_RBX 1
#define MACH_O_UNWIND_X86_64_REG_R12 2
#define MACH_O_UNWIND_X86_64_REG_R13 3
#define MACH_O_UNWIND_X86_64_REG_R14 4
#define MACH_O_UNWIND_X86_64_REG_R15 5
#define MACH_O_UNWIND_X86_64_REG_RBP 6
/* Encodings for x86 (almot the same as x86-64). */
/* Kind of encoding (4 bits). */
#define MACH_O_UNWIND_X86_MODE_MASK 0x0f000000
/* Frame is EBP based, using the standard sequence: push %ebp; mov %esp, %ebp.
Non-volatile registers must be saved in the stack starting at %ebp-4 to
%ebp-240 (offset is encoded in offset bits * 4). Registers saved are
encoded in registers bits, 3 bits per register. */
#define MACH_O_UNWIND_X86_MODE_EBP_FRAME 0x01000000
#define MACH_O_UNWIND_X86_EBP_FRAME_REGSITERS 0x00007FFF
#define MACH_O_UNWIND_X86_EBP_FRAME_OFFSET 0x00FF0000
/* Frameless function, with a small stack size. */
#define MACH_O_UNWIND_X86_MODE_STACK_IMMD 0x02000000
#define MACH_O_UNWIND_X86_FRAMELESS_STACK_SIZE 0x00FF0000
#define MACH_O_UNWIND_X86_FRAMELESS_REG_COUNT 0x00001C00
#define MACH_O_UNWIND_X86_FRAMELESS_REG_PERMUTATION 0x000003FF
/* Frameless function, with a larger stack size. The stack size is the sum
of the X in subq $X,%esp (address of X is at function + stack size bits)
and stack adjust. */
#define MACH_O_UNWIND_X86_MODE_STACK_IND 0x03000000
#define MACH_O_UNWIND_X86_FRAMELESS_STACK_ADJUST 0x0000E000
/* Use dwarf. */
#define MACH_O_UNWIND_X86_MODE_DWARF 0x04000000
#define MACH_O_UNWIND_X86_DWARF_SECTION_OFFSET 0x00ffffff
/* Registers. */
#define MACH_O_UNWIND_X86_REG_NONE 0
#define MACH_O_UNWIND_X86_REG_EBX 1
#define MACH_O_UNWIND_X86_REG_ECX 2
#define MACH_O_UNWIND_X86_REG_EDX 3
#define MACH_O_UNWIND_X86_REG_EDI 4
#define MACH_O_UNWIND_X86_REG_ESI 5
#define MACH_O_UNWIND_X86_REG_EBP 6
/* Entry in object file (in __LD,__compact_unwind section). */
struct mach_o_compact_unwind_32
{
unsigned char start[4];
unsigned char length[4];
unsigned char encoding[4];
unsigned char personality[4];
unsigned char lsda[4];
};
struct mach_o_compact_unwind_64
{
unsigned char start[8];
unsigned char length[4];
unsigned char encoding[4];
unsigned char personnality[8];
unsigned char lsda[8];
};
/* Header in images (in __TEXT,__unwind_info). */
#define MACH_O_UNWIND_SECTION_VERSION 1 /* Current verion in header. */
struct mach_o_unwind_info_header
{
unsigned char version[4]; /* Currently MACH_O_UNWIND_SECTION_VERSION. */
unsigned char encodings_array_offset[4];
unsigned char encodings_array_count[4];
unsigned char personality_array_offset[4];
unsigned char personality_array_count[4];
unsigned char index_offset[4];
unsigned char index_count[4];
/* Followed by:
- encodings array
These are the encodings shared, for index < encoding_array_count
- personality array
count given by personality_array_count
- index entries
count given by index_count
- lsda index entries
last offset given by lsda offset of last index_entry.
*/
};
struct mach_o_unwind_index_entry
{
unsigned char function_offset[4];
unsigned char second_level_offset[4];
unsigned char lsda_index_offset[4];
};
struct mach_o_unwind_lsda_index_entry
{
unsigned char function_offset[4];
unsigned char lsda_offset[4];
};
/* Second level index pages. */
#define MACH_O_UNWIND_SECOND_LEVEL_REGULAR 2
struct mach_o_unwind_regular_second_level_page_header
{
unsigned char kind[4];
unsigned char entry_page_offset[2];
unsigned char entry_count[2];
/* Array of entries. */
};
struct mach_o_unwind_regular_second_level_entry
{
unsigned char function_offset[4];
unsigned char encoding[4];
};
#define MACH_O_UNWIND_SECOND_LEVEL_COMPRESSED 3
struct mach_o_unwind_compressed_second_level_page_header
{
unsigned char kind[4];
unsigned char entry_page_offset[2];
unsigned char entry_count[2];
unsigned char encodings_offset[2];
unsigned char encodings_count[2];
/* Followed by entries array (one word, see below). */
/* Followed by (non-common) encodings array. */
};
/* Compressed entries are one word, containing function offset and encoding
index. */
#define MACH_O_UNWIND_INFO_COMPRESSED_ENTRY_FUNC_OFFSET(en) \
((en) & 0x00FFFFFF)
#define MACH_O_UNWIND_INFO_COMPRESSED_ENTRY_ENCODING_INDEX(en) \
(((en) >> 24) & 0xFF)
#endif /* _MACH_O_UNWIND_H */