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ruby/addr2line.c

2699 строки
76 KiB
C
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/**********************************************************************
addr2line.c -
$Author$
Copyright (C) 2010 Shinichiro Hamaji
**********************************************************************/
#if defined(__clang__) && defined(__has_warning)
#if __has_warning("-Wgnu-empty-initializer")
#pragma clang diagnostic ignored "-Wgnu-empty-initializer"
#endif
#if __has_warning("-Wgcc-compat")
#pragma clang diagnostic ignored "-Wgcc-compat"
#endif
#endif
#include "ruby/internal/config.h"
#include "ruby/defines.h"
#include "ruby/missing.h"
#include "addr2line.h"
#include <stdio.h>
#include <errno.h>
#ifdef HAVE_LIBPROC_H
#include <libproc.h>
#endif
#include "ruby/internal/stdbool.h"
#if defined(USE_ELF) || defined(HAVE_MACH_O_LOADER_H)
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
/* Make alloca work the best possible way. */
#ifdef __GNUC__
# ifndef alloca
# define alloca __builtin_alloca
# endif
#else
# ifdef HAVE_ALLOCA_H
# include <alloca.h>
# else
# ifdef _AIX
#pragma alloca
# else
# ifndef alloca /* predefined by HP cc +Olibcalls */
void *alloca();
# endif
# endif /* AIX */
# endif /* HAVE_ALLOCA_H */
# ifndef UNREACHABLE
# define UNREACHABLE __builtin_unreachable()
# endif
# ifndef UNREACHABLE_RETURN
# define UNREACHABLE_RETURN(_) __builtin_unreachable()
# endif
#endif /* __GNUC__ */
#ifndef UNREACHABLE
# define UNREACHABLE abort()
#endif
#ifndef UNREACHABLE_RETURN
# define UNREACHABLE_RETURN(_) return (abort(), (_))
#endif
#ifdef HAVE_DLADDR
# include <dlfcn.h>
#endif
#ifdef HAVE_MACH_O_LOADER_H
# include <crt_externs.h>
# include <mach-o/fat.h>
# include <mach-o/loader.h>
# include <mach-o/nlist.h>
# include <mach-o/stab.h>
#endif
#ifdef USE_ELF
# ifdef __OpenBSD__
# include <elf_abi.h>
# else
# include <elf.h>
# endif
#ifndef ElfW
# if SIZEOF_VOIDP == 8
# define ElfW(x) Elf64##_##x
# else
# define ElfW(x) Elf32##_##x
# endif
#endif
#ifndef ELF_ST_TYPE
# if SIZEOF_VOIDP == 8
# define ELF_ST_TYPE ELF64_ST_TYPE
# else
# define ELF_ST_TYPE ELF32_ST_TYPE
# endif
#endif
#endif
#ifdef SHF_COMPRESSED
# if defined(ELFCOMPRESS_ZLIB) && defined(HAVE_LIBZ)
/* FreeBSD 11.0 lacks ELFCOMPRESS_ZLIB */
# include <zlib.h>
# define SUPPORT_COMPRESSED_DEBUG_LINE
# endif
#else /* compatibility with glibc < 2.22 */
# define SHF_COMPRESSED 0
#endif
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif
#define DW_LNS_copy 0x01
#define DW_LNS_advance_pc 0x02
#define DW_LNS_advance_line 0x03
#define DW_LNS_set_file 0x04
#define DW_LNS_set_column 0x05
#define DW_LNS_negate_stmt 0x06
#define DW_LNS_set_basic_block 0x07
#define DW_LNS_const_add_pc 0x08
#define DW_LNS_fixed_advance_pc 0x09
#define DW_LNS_set_prologue_end 0x0a /* DWARF3 */
#define DW_LNS_set_epilogue_begin 0x0b /* DWARF3 */
#define DW_LNS_set_isa 0x0c /* DWARF3 */
/* Line number extended opcode name. */
#define DW_LNE_end_sequence 0x01
#define DW_LNE_set_address 0x02
#define DW_LNE_define_file 0x03
#define DW_LNE_set_discriminator 0x04 /* DWARF4 */
#define kprintf(...) fprintf(stderr, "" __VA_ARGS__)
typedef struct line_info {
const char *dirname;
const char *filename;
const char *path; /* object path */
int line;
uintptr_t base_addr;
uintptr_t saddr;
const char *sname; /* function name */
struct line_info *next;
} line_info_t;
struct dwarf_section {
char *ptr;
size_t size;
uint64_t flags;
};
typedef struct obj_info {
const char *path; /* object path */
char *mapped;
size_t mapped_size;
void *uncompressed;
uintptr_t base_addr;
uintptr_t vmaddr;
struct dwarf_section debug_abbrev;
struct dwarf_section debug_info;
struct dwarf_section debug_line;
struct dwarf_section debug_ranges;
struct dwarf_section debug_str_offsets;
struct dwarf_section debug_addr;
struct dwarf_section debug_rnglists;
struct dwarf_section debug_str;
struct dwarf_section debug_line_str;
struct obj_info *next;
} obj_info_t;
#define DWARF_SECTION_COUNT 9
static struct dwarf_section *
obj_dwarf_section_at(obj_info_t *obj, int n)
{
struct dwarf_section *ary[] = {
&obj->debug_abbrev,
&obj->debug_info,
&obj->debug_line,
&obj->debug_ranges,
&obj->debug_str_offsets,
&obj->debug_addr,
&obj->debug_rnglists,
&obj->debug_str,
&obj->debug_line_str
};
if (n < 0 || DWARF_SECTION_COUNT <= n) {
UNREACHABLE_RETURN(0);
}
return ary[n];
}
struct debug_section_definition {
const char *name;
struct dwarf_section *dwarf;
};
/* Avoid consuming stack as this module may be used from signal handler */
static char binary_filename[PATH_MAX + 1];
static unsigned long
uleb128(const char **p)
{
unsigned long r = 0;
int s = 0;
for (;;) {
unsigned char b = (unsigned char)*(*p)++;
if (b < 0x80) {
r += (unsigned long)b << s;
break;
}
r += (b & 0x7f) << s;
s += 7;
}
return r;
}
static long
sleb128(const char **p)
{
long r = 0;
int s = 0;
for (;;) {
unsigned char b = (unsigned char)*(*p)++;
if (b < 0x80) {
if (b & 0x40) {
r -= (0x80 - b) << s;
}
else {
r += (b & 0x3f) << s;
}
break;
}
r += (b & 0x7f) << s;
s += 7;
}
return r;
}
static const char *
get_nth_dirname(unsigned long dir, const char *p)
{
if (!dir--) {
return "";
}
while (dir--) {
while (*p) p++;
p++;
if (!*p) {
kprintf("Unexpected directory number %lu in %s\n",
dir, binary_filename);
return "";
}
}
return p;
}
static const char *parse_ver5_debug_line_header(const char *p, int idx, uint8_t format, obj_info_t *obj, const char **out_path, uint64_t *out_directory_index);
static void
fill_filename(int file, uint8_t format, uint16_t version, const char *include_directories, const char *filenames, line_info_t *line, obj_info_t *obj)
{
int i;
const char *p = filenames;
const char *filename;
unsigned long dir;
if (version >= 5) {
const char *path;
uint64_t directory_index = -1;
parse_ver5_debug_line_header(filenames, file, format, obj, &path, &directory_index);
line->filename = path;
parse_ver5_debug_line_header(include_directories, (int)directory_index, format, obj, &path, NULL);
line->dirname = path;
}
else {
for (i = 1; i <= file; i++) {
filename = p;
if (!*p) {
/* Need to output binary file name? */
kprintf("Unexpected file number %d in %s at %tx\n",
file, binary_filename, filenames - obj->mapped);
return;
}
while (*p) p++;
p++;
dir = uleb128(&p);
/* last modified. */
uleb128(&p);
/* size of the file. */
uleb128(&p);
if (i == file) {
line->filename = filename;
line->dirname = get_nth_dirname(dir, include_directories);
}
}
}
}
static void
fill_line(int num_traces, void **traces, uintptr_t addr, int file, int line,
uint8_t format, uint16_t version, const char *include_directories, const char *filenames,
obj_info_t *obj, line_info_t *lines, int offset)
{
int i;
addr += obj->base_addr - obj->vmaddr;
for (i = offset; i < num_traces; i++) {
uintptr_t a = (uintptr_t)traces[i];
/* We assume one line code doesn't result >100 bytes of native code.
We may want more reliable way eventually... */
if (addr < a && a < addr + 100) {
fill_filename(file, format, version, include_directories, filenames, &lines[i], obj);
lines[i].line = line;
}
}
}
struct LineNumberProgramHeader {
uint64_t unit_length;
uint16_t version;
uint8_t format; /* 4 or 8 */
uint64_t header_length;
uint8_t minimum_instruction_length;
uint8_t maximum_operations_per_instruction;
uint8_t default_is_stmt;
int8_t line_base;
uint8_t line_range;
uint8_t opcode_base;
/* uint8_t standard_opcode_lengths[opcode_base-1]; */
const char *include_directories;
const char *filenames;
const char *cu_start;
const char *cu_end;
};
static int
parse_debug_line_header(obj_info_t *obj, const char **pp, struct LineNumberProgramHeader *header)
{
const char *p = *pp;
header->unit_length = *(uint32_t *)p;
p += sizeof(uint32_t);
header->format = 4;
if (header->unit_length == 0xffffffff) {
header->unit_length = *(uint64_t *)p;
p += sizeof(uint64_t);
header->format = 8;
}
header->cu_end = p + header->unit_length;
header->version = *(uint16_t *)p;
p += sizeof(uint16_t);
if (header->version > 5) return -1;
if (header->version >= 5) {
/* address_size = *(uint8_t *)p++; */
/* segment_selector_size = *(uint8_t *)p++; */
p += 2;
}
header->header_length = header->format == 4 ? *(uint32_t *)p : *(uint64_t *)p;
p += header->format;
header->cu_start = p + header->header_length;
header->minimum_instruction_length = *(uint8_t *)p++;
if (header->version >= 4) {
/* maximum_operations_per_instruction = *(uint8_t *)p; */
if (*p != 1) return -1; /* For non-VLIW architectures, this field is 1 */
p++;
}
header->default_is_stmt = *(uint8_t *)p++;
header->line_base = *(int8_t *)p++;
header->line_range = *(uint8_t *)p++;
header->opcode_base = *(uint8_t *)p++;
/* header->standard_opcode_lengths = (uint8_t *)p - 1; */
p += header->opcode_base - 1;
if (header->version >= 5) {
header->include_directories = p;
p = parse_ver5_debug_line_header(p, -1, header->format, obj, NULL, NULL);
header->filenames = p;
}
else {
header->include_directories = p;
/* temporary measure for compress-debug-sections */
if (p >= header->cu_end) return -1;
/* skip include directories */
while (*p) {
p = memchr(p, '\0', header->cu_end - p);
if (!p) return -1;
p++;
}
p++;
header->filenames = p;
}
*pp = header->cu_start;
return 0;
}
static int
parse_debug_line_cu(int num_traces, void **traces, const char **debug_line,
obj_info_t *obj, line_info_t *lines, int offset)
{
const char *p = (const char *)*debug_line;
struct LineNumberProgramHeader header;
/* The registers. */
unsigned long addr = 0;
unsigned int file = 1;
unsigned int line = 1;
/* unsigned int column = 0; */
int is_stmt;
/* int basic_block = 0; */
/* int end_sequence = 0; */
/* int prologue_end = 0; */
/* int epilogue_begin = 0; */
/* unsigned int isa = 0; */
if (parse_debug_line_header(obj, &p, &header))
return -1;
is_stmt = header.default_is_stmt;
#define FILL_LINE() \
do { \
fill_line(num_traces, traces, addr, file, line, \
header.format, \
header.version, \
header.include_directories, \
header.filenames, \
obj, lines, offset); \
/*basic_block = prologue_end = epilogue_begin = 0;*/ \
} while (0)
while (p < header.cu_end) {
unsigned long a;
unsigned char op = *p++;
switch (op) {
case DW_LNS_copy:
FILL_LINE();
break;
case DW_LNS_advance_pc:
a = uleb128(&p) * header.minimum_instruction_length;
addr += a;
break;
case DW_LNS_advance_line: {
long a = sleb128(&p);
line += a;
break;
}
case DW_LNS_set_file:
file = (unsigned int)uleb128(&p);
break;
case DW_LNS_set_column:
/*column = (unsigned int)*/(void)uleb128(&p);
break;
case DW_LNS_negate_stmt:
is_stmt = !is_stmt;
break;
case DW_LNS_set_basic_block:
/*basic_block = 1; */
break;
case DW_LNS_const_add_pc:
a = ((255UL - header.opcode_base) / header.line_range) *
header.minimum_instruction_length;
addr += a;
break;
case DW_LNS_fixed_advance_pc:
a = *(uint16_t *)p;
p += sizeof(uint16_t);
addr += a;
break;
case DW_LNS_set_prologue_end:
/* prologue_end = 1; */
break;
case DW_LNS_set_epilogue_begin:
/* epilogue_begin = 1; */
break;
case DW_LNS_set_isa:
/* isa = (unsigned int)*/(void)uleb128(&p);
break;
case 0:
a = uleb128(&p);
op = *p++;
switch (op) {
case DW_LNE_end_sequence:
/* end_sequence = 1; */
FILL_LINE();
addr = 0;
file = 1;
line = 1;
/* column = 0; */
is_stmt = header.default_is_stmt;
/* end_sequence = 0; */
/* isa = 0; */
break;
case DW_LNE_set_address:
addr = *(unsigned long *)p;
p += sizeof(unsigned long);
break;
case DW_LNE_define_file:
kprintf("Unsupported operation in %s\n",
binary_filename);
break;
case DW_LNE_set_discriminator:
/* TODO:currently ignore */
uleb128(&p);
break;
default:
kprintf("Unknown extended opcode: %d in %s\n",
op, binary_filename);
}
break;
default: {
uint8_t adjusted_opcode = op - header.opcode_base;
uint8_t operation_advance = adjusted_opcode / header.line_range;
/* NOTE: this code doesn't support VLIW */
addr += operation_advance * header.minimum_instruction_length;
line += header.line_base + (adjusted_opcode % header.line_range);
FILL_LINE();
}
}
}
*debug_line = (char *)p;
return 0;
}
static int
parse_debug_line(int num_traces, void **traces,
const char *debug_line, unsigned long size,
obj_info_t *obj, line_info_t *lines, int offset)
{
const char *debug_line_end = debug_line + size;
while (debug_line < debug_line_end) {
if (parse_debug_line_cu(num_traces, traces, &debug_line, obj, lines, offset))
return -1;
}
if (debug_line != debug_line_end) {
kprintf("Unexpected size of .debug_line in %s\n",
binary_filename);
}
return 0;
}
/* read file and fill lines */
static uintptr_t
fill_lines(int num_traces, void **traces, int check_debuglink,
obj_info_t **objp, line_info_t *lines, int offset);
static void
append_obj(obj_info_t **objp)
{
obj_info_t *newobj = calloc(1, sizeof(obj_info_t));
if (*objp) (*objp)->next = newobj;
*objp = newobj;
}
#ifdef USE_ELF
/* Ideally we should check 4 paths to follow gnu_debuglink:
*
* - /usr/lib/debug/.build-id/ab/cdef1234.debug
* - /usr/bin/ruby.debug
* - /usr/bin/.debug/ruby.debug
* - /usr/lib/debug/usr/bin/ruby.debug.
*
* but we handle only two cases for now as the two formats are
* used by some linux distributions.
*
* See GDB's info for detail.
* https://sourceware.org/gdb/onlinedocs/gdb/Separate-Debug-Files.html
*/
// check the path pattern of "/usr/lib/debug/usr/bin/ruby.debug"
static void
follow_debuglink(const char *debuglink, int num_traces, void **traces,
obj_info_t **objp, line_info_t *lines, int offset)
{
static const char global_debug_dir[] = "/usr/lib/debug";
const size_t global_debug_dir_len = sizeof(global_debug_dir) - 1;
char *p;
obj_info_t *o1 = *objp, *o2;
size_t len;
p = strrchr(binary_filename, '/');
if (!p) {
return;
}
p[1] = '\0';
len = strlen(binary_filename);
if (len >= PATH_MAX - global_debug_dir_len)
len = PATH_MAX - global_debug_dir_len - 1;
memmove(binary_filename + global_debug_dir_len, binary_filename, len);
memcpy(binary_filename, global_debug_dir, global_debug_dir_len);
len += global_debug_dir_len;
strlcpy(binary_filename + len, debuglink, PATH_MAX - len);
append_obj(objp);
o2 = *objp;
o2->base_addr = o1->base_addr;
o2->path = o1->path;
fill_lines(num_traces, traces, 0, objp, lines, offset);
}
// check the path pattern of "/usr/lib/debug/.build-id/ab/cdef1234.debug"
static void
follow_debuglink_build_id(const char *build_id, size_t build_id_size, int num_traces, void **traces,
obj_info_t **objp, line_info_t *lines, int offset)
{
static const char global_debug_dir[] = "/usr/lib/debug/.build-id/";
const size_t global_debug_dir_len = sizeof(global_debug_dir) - 1;
char *p;
obj_info_t *o1 = *objp, *o2;
size_t i;
if (PATH_MAX < global_debug_dir_len + 1 + build_id_size * 2 + 6) return;
memcpy(binary_filename, global_debug_dir, global_debug_dir_len);
p = binary_filename + global_debug_dir_len;
for (i = 0; i < build_id_size; i++) {
static const char tbl[] = "0123456789abcdef";
unsigned char n = build_id[i];
*p++ = tbl[n / 16];
*p++ = tbl[n % 16];
if (i == 0) *p++ = '/';
}
strcpy(p, ".debug");
append_obj(objp);
o2 = *objp;
o2->base_addr = o1->base_addr;
o2->path = o1->path;
fill_lines(num_traces, traces, 0, objp, lines, offset);
}
#endif
enum
{
DW_TAG_compile_unit = 0x11,
DW_TAG_inlined_subroutine = 0x1d,
DW_TAG_subprogram = 0x2e,
};
/* Attributes encodings */
enum
{
DW_AT_sibling = 0x01,
DW_AT_location = 0x02,
DW_AT_name = 0x03,
/* Reserved 0x04 */
/* Reserved 0x05 */
/* Reserved 0x06 */
/* Reserved 0x07 */
/* Reserved 0x08 */
DW_AT_ordering = 0x09,
/* Reserved 0x0a */
DW_AT_byte_size = 0x0b,
/* Reserved 0x0c */
DW_AT_bit_size = 0x0d,
/* Reserved 0x0e */
/* Reserved 0x0f */
DW_AT_stmt_list = 0x10,
DW_AT_low_pc = 0x11,
DW_AT_high_pc = 0x12,
DW_AT_language = 0x13,
/* Reserved 0x14 */
DW_AT_discr = 0x15,
DW_AT_discr_value = 0x16,
DW_AT_visibility = 0x17,
DW_AT_import = 0x18,
DW_AT_string_length = 0x19,
DW_AT_common_reference = 0x1a,
DW_AT_comp_dir = 0x1b,
DW_AT_const_value = 0x1c,
DW_AT_containing_type = 0x1d,
DW_AT_default_value = 0x1e,
/* Reserved 0x1f */
DW_AT_inline = 0x20,
DW_AT_is_optional = 0x21,
DW_AT_lower_bound = 0x22,
/* Reserved 0x23 */
/* Reserved 0x24 */
DW_AT_producer = 0x25,
/* Reserved 0x26 */
DW_AT_prototyped = 0x27,
/* Reserved 0x28 */
/* Reserved 0x29 */
DW_AT_return_addr = 0x2a,
/* Reserved 0x2b */
DW_AT_start_scope = 0x2c,
/* Reserved 0x2d */
DW_AT_bit_stride = 0x2e,
DW_AT_upper_bound = 0x2f,
/* Reserved 0x30 */
DW_AT_abstract_origin = 0x31,
DW_AT_accessibility = 0x32,
DW_AT_address_class = 0x33,
DW_AT_artificial = 0x34,
DW_AT_base_types = 0x35,
DW_AT_calling_convention = 0x36,
DW_AT_count = 0x37,
DW_AT_data_member_location = 0x38,
DW_AT_decl_column = 0x39,
DW_AT_decl_file = 0x3a,
DW_AT_decl_line = 0x3b,
DW_AT_declaration = 0x3c,
DW_AT_discr_list = 0x3d,
DW_AT_encoding = 0x3e,
DW_AT_external = 0x3f,
DW_AT_frame_base = 0x40,
DW_AT_friend = 0x41,
DW_AT_identifier_case = 0x42,
/* Reserved 0x43 */
DW_AT_namelist_item = 0x44,
DW_AT_priority = 0x45,
DW_AT_segment = 0x46,
DW_AT_specification = 0x47,
DW_AT_static_link = 0x48,
DW_AT_type = 0x49,
DW_AT_use_location = 0x4a,
DW_AT_variable_parameter = 0x4b,
DW_AT_virtuality = 0x4c,
DW_AT_vtable_elem_location = 0x4d,
DW_AT_allocated = 0x4e,
DW_AT_associated = 0x4f,
DW_AT_data_location = 0x50,
DW_AT_byte_stride = 0x51,
DW_AT_entry_pc = 0x52,
DW_AT_use_UTF8 = 0x53,
DW_AT_extension = 0x54,
DW_AT_ranges = 0x55,
DW_AT_trampoline = 0x56,
DW_AT_call_column = 0x57,
DW_AT_call_file = 0x58,
DW_AT_call_line = 0x59,
DW_AT_description = 0x5a,
DW_AT_binary_scale = 0x5b,
DW_AT_decimal_scale = 0x5c,
DW_AT_small = 0x5d,
DW_AT_decimal_sign = 0x5e,
DW_AT_digit_count = 0x5f,
DW_AT_picture_string = 0x60,
DW_AT_mutable = 0x61,
DW_AT_threads_scaled = 0x62,
DW_AT_explicit = 0x63,
DW_AT_object_pointer = 0x64,
DW_AT_endianity = 0x65,
DW_AT_elemental = 0x66,
DW_AT_pure = 0x67,
DW_AT_recursive = 0x68,
DW_AT_signature = 0x69,
DW_AT_main_subprogram = 0x6a,
DW_AT_data_bit_offset = 0x6b,
DW_AT_const_expr = 0x6c,
DW_AT_enum_class = 0x6d,
DW_AT_linkage_name = 0x6e,
DW_AT_string_length_bit_size = 0x6f,
DW_AT_string_length_byte_size = 0x70,
DW_AT_rank = 0x71,
DW_AT_str_offsets_base = 0x72,
DW_AT_addr_base = 0x73,
DW_AT_rnglists_base = 0x74,
/* Reserved 0x75 */
DW_AT_dwo_name = 0x76,
DW_AT_reference = 0x77,
DW_AT_rvalue_reference = 0x78,
DW_AT_macros = 0x79,
DW_AT_call_all_calls = 0x7a,
DW_AT_call_all_source_calls = 0x7b,
DW_AT_call_all_tail_calls = 0x7c,
DW_AT_call_return_pc = 0x7d,
DW_AT_call_value = 0x7e,
DW_AT_call_origin = 0x7f,
DW_AT_call_parameter = 0x80,
DW_AT_call_pc = 0x81,
DW_AT_call_tail_call = 0x82,
DW_AT_call_target = 0x83,
DW_AT_call_target_clobbered = 0x84,
DW_AT_call_data_location = 0x85,
DW_AT_call_data_value = 0x86,
DW_AT_noreturn = 0x87,
DW_AT_alignment = 0x88,
DW_AT_export_symbols = 0x89,
DW_AT_deleted = 0x8a,
DW_AT_defaulted = 0x8b,
DW_AT_loclists_base = 0x8c,
DW_AT_lo_user = 0x2000,
DW_AT_hi_user = 0x3fff
};
/* Attribute form encodings */
enum
{
DW_FORM_addr = 0x01,
/* Reserved 0x02 */
DW_FORM_block2 = 0x03,
DW_FORM_block4 = 0x04,
DW_FORM_data2 = 0x05,
DW_FORM_data4 = 0x06,
DW_FORM_data8 = 0x07,
DW_FORM_string = 0x08,
DW_FORM_block = 0x09,
DW_FORM_block1 = 0x0a,
DW_FORM_data1 = 0x0b,
DW_FORM_flag = 0x0c,
DW_FORM_sdata = 0x0d,
DW_FORM_strp = 0x0e,
DW_FORM_udata = 0x0f,
DW_FORM_ref_addr = 0x10,
DW_FORM_ref1 = 0x11,
DW_FORM_ref2 = 0x12,
DW_FORM_ref4 = 0x13,
DW_FORM_ref8 = 0x14,
DW_FORM_ref_udata = 0x15,
DW_FORM_indirect = 0x16,
DW_FORM_sec_offset = 0x17,
DW_FORM_exprloc = 0x18,
DW_FORM_flag_present = 0x19,
DW_FORM_strx = 0x1a,
DW_FORM_addrx = 0x1b,
DW_FORM_ref_sup4 = 0x1c,
DW_FORM_strp_sup = 0x1d,
DW_FORM_data16 = 0x1e,
DW_FORM_line_strp = 0x1f,
DW_FORM_ref_sig8 = 0x20,
DW_FORM_implicit_const = 0x21,
DW_FORM_loclistx = 0x22,
DW_FORM_rnglistx = 0x23,
DW_FORM_ref_sup8 = 0x24,
DW_FORM_strx1 = 0x25,
DW_FORM_strx2 = 0x26,
DW_FORM_strx3 = 0x27,
DW_FORM_strx4 = 0x28,
DW_FORM_addrx1 = 0x29,
DW_FORM_addrx2 = 0x2a,
DW_FORM_addrx3 = 0x2b,
DW_FORM_addrx4 = 0x2c,
/* GNU extensions for referring to .gnu_debugaltlink dwz-compressed info */
DW_FORM_GNU_ref_alt = 0x1f20,
DW_FORM_GNU_strp_alt = 0x1f21
};
/* Range list entry encodings */
enum {
DW_RLE_end_of_list = 0x00,
DW_RLE_base_addressx = 0x01,
DW_RLE_startx_endx = 0x02,
DW_RLE_startx_length = 0x03,
DW_RLE_offset_pair = 0x04,
DW_RLE_base_address = 0x05,
DW_RLE_start_end = 0x06,
DW_RLE_start_length = 0x07
};
enum {
VAL_none = 0,
VAL_cstr = 1,
VAL_data = 2,
VAL_uint = 3,
VAL_int = 4,
VAL_addr = 5
};
# define ABBREV_TABLE_SIZE 256
typedef struct {
obj_info_t *obj;
const char *file;
uint8_t current_version;
const char *current_cu;
uint64_t current_low_pc;
uint64_t current_str_offsets_base;
uint64_t current_addr_base;
uint64_t current_rnglists_base;
const char *debug_line_cu_end;
uint8_t debug_line_format;
uint16_t debug_line_version;
const char *debug_line_files;
const char *debug_line_directories;
const char *p;
const char *cu_end;
const char *pend;
const char *q0;
const char *q;
int format; // 4 or 8
uint8_t address_size;
int level;
const char *abbrev_table[ABBREV_TABLE_SIZE];
} DebugInfoReader;
typedef struct {
ptrdiff_t pos;
int tag;
int has_children;
} DIE;
typedef struct {
union {
const char *ptr;
uint64_t uint64;
int64_t int64;
uint64_t addr_idx;
} as;
uint64_t off;
uint64_t at;
uint64_t form;
size_t size;
int type;
} DebugInfoValue;
#if defined(WORDS_BIGENDIAN)
#define MERGE_2INTS(a,b,sz) (((uint64_t)(a)<<sz)|(b))
#else
#define MERGE_2INTS(a,b,sz) (((uint64_t)(b)<<sz)|(a))
#endif
static uint16_t
get_uint16(const uint8_t *p)
{
return (uint16_t)MERGE_2INTS(p[0],p[1],8);
}
static uint32_t
get_uint32(const uint8_t *p)
{
return (uint32_t)MERGE_2INTS(get_uint16(p),get_uint16(p+2),16);
}
static uint64_t
get_uint64(const uint8_t *p)
{
return MERGE_2INTS(get_uint32(p),get_uint32(p+4),32);
}
static uint8_t
read_uint8(const char **ptr)
{
const char *p = *ptr;
*ptr = (p + 1);
return (uint8_t)*p;
}
static uint16_t
read_uint16(const char **ptr)
{
const char *p = *ptr;
*ptr = (p + 2);
return get_uint16((const uint8_t *)p);
}
static uint32_t
read_uint24(const char **ptr)
{
const char *p = *ptr;
*ptr = (p + 3);
return ((uint8_t)*p << 16) | get_uint16((const uint8_t *)p+1);
}
static uint32_t
read_uint32(const char **ptr)
{
const char *p = *ptr;
*ptr = (p + 4);
return get_uint32((const uint8_t *)p);
}
static uint64_t
read_uint64(const char **ptr)
{
const unsigned char *p = (const unsigned char *)*ptr;
*ptr = (char *)(p + 8);
return get_uint64(p);
}
static uintptr_t
read_uintptr(const char **ptr)
{
const unsigned char *p = (const unsigned char *)*ptr;
*ptr = (char *)(p + SIZEOF_VOIDP);
#if SIZEOF_VOIDP == 8
return get_uint64(p);
#else
return get_uint32(p);
#endif
}
static uint64_t
read_uint(DebugInfoReader *reader)
{
if (reader->format == 4) {
return read_uint32(&reader->p);
} else { /* 64 bit */
return read_uint64(&reader->p);
}
}
static uint64_t
read_uleb128(DebugInfoReader *reader)
{
return uleb128(&reader->p);
}
static int64_t
read_sleb128(DebugInfoReader *reader)
{
return sleb128(&reader->p);
}
static void
debug_info_reader_init(DebugInfoReader *reader, obj_info_t *obj)
{
reader->file = obj->mapped;
reader->obj = obj;
reader->p = obj->debug_info.ptr;
reader->pend = obj->debug_info.ptr + obj->debug_info.size;
reader->debug_line_cu_end = obj->debug_line.ptr;
reader->current_low_pc = 0;
reader->current_str_offsets_base = 0;
reader->current_addr_base = 0;
reader->current_rnglists_base = 0;
}
static void
di_skip_die_attributes(const char **p)
{
for (;;) {
uint64_t at = uleb128(p);
uint64_t form = uleb128(p);
if (!at && !form) break;
switch (form) {
default:
break;
case DW_FORM_implicit_const:
sleb128(p);
break;
}
}
}
static void
di_read_debug_abbrev_cu(DebugInfoReader *reader)
{
uint64_t prev = 0;
const char *p = reader->q0;
for (;;) {
uint64_t abbrev_number = uleb128(&p);
if (abbrev_number <= prev) break;
if (abbrev_number < ABBREV_TABLE_SIZE) {
reader->abbrev_table[abbrev_number] = p;
}
prev = abbrev_number;
uleb128(&p); /* tag */
p++; /* has_children */
di_skip_die_attributes(&p);
}
}
static int
di_read_debug_line_cu(DebugInfoReader *reader)
{
const char *p;
struct LineNumberProgramHeader header;
p = (const char *)reader->debug_line_cu_end;
if (parse_debug_line_header(reader->obj, &p, &header))
return -1;
reader->debug_line_cu_end = (char *)header.cu_end;
reader->debug_line_format = header.format;
reader->debug_line_version = header.version;
reader->debug_line_directories = (char *)header.include_directories;
reader->debug_line_files = (char *)header.filenames;
return 0;
}
static void
set_addr_idx_value(DebugInfoValue *v, uint64_t n)
{
v->as.addr_idx = n;
v->type = VAL_addr;
}
static void
set_uint_value(DebugInfoValue *v, uint64_t n)
{
v->as.uint64 = n;
v->type = VAL_uint;
}
static void
set_int_value(DebugInfoValue *v, int64_t n)
{
v->as.int64 = n;
v->type = VAL_int;
}
static void
set_cstr_value(DebugInfoValue *v, const char *s)
{
v->as.ptr = s;
v->off = 0;
v->type = VAL_cstr;
}
static void
set_cstrp_value(DebugInfoValue *v, const char *s, uint64_t off)
{
v->as.ptr = s;
v->off = off;
v->type = VAL_cstr;
}
static void
set_data_value(DebugInfoValue *v, const char *s)
{
v->as.ptr = s;
v->type = VAL_data;
}
static const char *
get_cstr_value(DebugInfoValue *v)
{
if (v->as.ptr) {
return v->as.ptr + v->off;
} else {
return NULL;
}
}
static const char *
resolve_strx(DebugInfoReader *reader, uint64_t idx)
{
const char *p = reader->obj->debug_str_offsets.ptr + reader->current_str_offsets_base;
uint64_t off;
if (reader->format == 4) {
off = ((uint32_t *)p)[idx];
}
else {
off = ((uint64_t *)p)[idx];
}
return reader->obj->debug_str.ptr + off;
}
static bool
debug_info_reader_read_addr_value_member(DebugInfoReader *reader, DebugInfoValue *v, int size)
{
if (size == 4) {
set_uint_value(v, read_uint32(&reader->p));
} else if (size == 8) {
set_uint_value(v, read_uint64(&reader->p));
} else {
return false;
}
return true;
}
#define debug_info_reader_read_addr_value(reader, v, mem) \
if (!debug_info_reader_read_addr_value_member((reader), (v), (reader)->mem)) { \
kprintf("unknown " #mem ":%d", (reader)->mem); \
return false; \
}
static bool
debug_info_reader_read_value(DebugInfoReader *reader, uint64_t form, DebugInfoValue *v)
{
switch (form) {
case DW_FORM_addr:
debug_info_reader_read_addr_value(reader, v, address_size);
break;
case DW_FORM_block2:
v->size = read_uint16(&reader->p);
set_data_value(v, reader->p);
reader->p += v->size;
break;
case DW_FORM_block4:
v->size = read_uint32(&reader->p);
set_data_value(v, reader->p);
reader->p += v->size;
break;
case DW_FORM_data2:
set_uint_value(v, read_uint16(&reader->p));
break;
case DW_FORM_data4:
set_uint_value(v, read_uint32(&reader->p));
break;
case DW_FORM_data8:
set_uint_value(v, read_uint64(&reader->p));
break;
case DW_FORM_string:
v->size = strlen(reader->p);
set_cstr_value(v, reader->p);
reader->p += v->size + 1;
break;
case DW_FORM_block:
v->size = uleb128(&reader->p);
set_data_value(v, reader->p);
reader->p += v->size;
break;
case DW_FORM_block1:
v->size = read_uint8(&reader->p);
set_data_value(v, reader->p);
reader->p += v->size;
break;
case DW_FORM_data1:
set_uint_value(v, read_uint8(&reader->p));
break;
case DW_FORM_flag:
set_uint_value(v, read_uint8(&reader->p));
break;
case DW_FORM_sdata:
set_int_value(v, read_sleb128(reader));
break;
case DW_FORM_strp:
set_cstrp_value(v, reader->obj->debug_str.ptr, read_uint(reader));
break;
case DW_FORM_udata:
set_uint_value(v, read_uleb128(reader));
break;
case DW_FORM_ref_addr:
if (reader->current_version <= 2) {
// DWARF Version 2 specifies that references have
// the same size as an address on the target system
debug_info_reader_read_addr_value(reader, v, address_size);
} else {
debug_info_reader_read_addr_value(reader, v, format);
}
break;
case DW_FORM_ref1:
set_uint_value(v, read_uint8(&reader->p));
break;
case DW_FORM_ref2:
set_uint_value(v, read_uint16(&reader->p));
break;
case DW_FORM_ref4:
set_uint_value(v, read_uint32(&reader->p));
break;
case DW_FORM_ref8:
set_uint_value(v, read_uint64(&reader->p));
break;
case DW_FORM_ref_udata:
set_uint_value(v, uleb128(&reader->p));
break;
case DW_FORM_indirect:
/* TODO: read the referred value */
set_uint_value(v, uleb128(&reader->p));
break;
case DW_FORM_sec_offset:
set_uint_value(v, read_uint(reader)); /* offset */
/* addrptr: debug_addr */
/* lineptr: debug_line */
/* loclist: debug_loclists */
/* loclistptr: debug_loclists */
/* macptr: debug_macro */
/* rnglist: debug_rnglists */
/* rnglistptr: debug_rnglists */
/* stroffsetsptr: debug_str_offsets */
break;
case DW_FORM_exprloc:
v->size = (size_t)read_uleb128(reader);
set_data_value(v, reader->p);
reader->p += v->size;
break;
case DW_FORM_flag_present:
set_uint_value(v, 1);
break;
case DW_FORM_strx:
set_cstr_value(v, resolve_strx(reader, uleb128(&reader->p)));
break;
case DW_FORM_addrx:
set_addr_idx_value(v, uleb128(&reader->p));
break;
case DW_FORM_ref_sup4:
set_uint_value(v, read_uint32(&reader->p));
break;
case DW_FORM_strp_sup:
set_uint_value(v, read_uint(reader));
/* *p = reader->sup_file + reader->sup_str->sh_offset + ret; */
break;
case DW_FORM_data16:
v->size = 16;
set_data_value(v, reader->p);
reader->p += v->size;
break;
case DW_FORM_line_strp:
set_cstrp_value(v, reader->obj->debug_line_str.ptr, read_uint(reader));
break;
case DW_FORM_ref_sig8:
set_uint_value(v, read_uint64(&reader->p));
break;
case DW_FORM_implicit_const:
set_int_value(v, sleb128(&reader->q));
break;
case DW_FORM_loclistx:
set_uint_value(v, read_uleb128(reader));
break;
case DW_FORM_rnglistx:
set_uint_value(v, read_uleb128(reader));
break;
case DW_FORM_ref_sup8:
set_uint_value(v, read_uint64(&reader->p));
break;
case DW_FORM_strx1:
set_cstr_value(v, resolve_strx(reader, read_uint8(&reader->p)));
break;
case DW_FORM_strx2:
set_cstr_value(v, resolve_strx(reader, read_uint16(&reader->p)));
break;
case DW_FORM_strx3:
set_cstr_value(v, resolve_strx(reader, read_uint24(&reader->p)));
break;
case DW_FORM_strx4:
set_cstr_value(v, resolve_strx(reader, read_uint32(&reader->p)));
break;
case DW_FORM_addrx1:
set_addr_idx_value(v, read_uint8(&reader->p));
break;
case DW_FORM_addrx2:
set_addr_idx_value(v, read_uint16(&reader->p));
break;
case DW_FORM_addrx3:
set_addr_idx_value(v, read_uint24(&reader->p));
break;
case DW_FORM_addrx4:
set_addr_idx_value(v, read_uint32(&reader->p));
break;
/* we have no support for actually reading the real values of these refs out
* of the .gnu_debugaltlink dwz-compressed debuginfo at the moment, but "read"
* them anyway so that we advance the reader by the right amount. */
case DW_FORM_GNU_ref_alt:
case DW_FORM_GNU_strp_alt:
read_uint(reader);
set_uint_value(v, 0);
break;
case 0:
goto fail;
break;
}
return true;
fail:
kprintf("%d: unsupported form: %#"PRIx64"\n", __LINE__, form);
return false;
}
/* find abbrev in current compilation unit */
static const char *
di_find_abbrev(DebugInfoReader *reader, uint64_t abbrev_number)
{
const char *p;
if (abbrev_number < ABBREV_TABLE_SIZE) {
return reader->abbrev_table[abbrev_number];
}
p = reader->abbrev_table[ABBREV_TABLE_SIZE-1];
/* skip 255th record */
uleb128(&p); /* tag */
p++; /* has_children */
di_skip_die_attributes(&p);
for (uint64_t n = uleb128(&p); abbrev_number != n; n = uleb128(&p)) {
if (n == 0) {
kprintf("%d: Abbrev Number %"PRId64" not found\n",__LINE__, abbrev_number);
return NULL;
}
uleb128(&p); /* tag */
p++; /* has_children */
di_skip_die_attributes(&p);
}
return p;
}
#if 0
static void
hexdump0(const unsigned char *p, size_t n)
{
size_t i;
kprintf(" 0 1 2 3 4 5 6 7 8 9 A B C D E F\n");
for (i=0; i < n; i++){
switch (i & 15) {
case 0:
kprintf("%02" PRIdSIZE ": %02X ", i/16, p[i]);
break;
case 15:
kprintf("%02X\n", p[i]);
break;
default:
kprintf("%02X ", p[i]);
break;
}
}
if ((i & 15) != 15) {
kprintf("\n");
}
}
#define hexdump(p,n) hexdump0((const unsigned char *)p, n)
static void
div_inspect(DebugInfoValue *v)
{
switch (v->type) {
case VAL_uint:
kprintf("%d: type:%d size:%" PRIxSIZE " v:%"PRIx64"\n",__LINE__,v->type,v->size,v->as.uint64);
break;
case VAL_int:
kprintf("%d: type:%d size:%" PRIxSIZE " v:%"PRId64"\n",__LINE__,v->type,v->size,(int64_t)v->as.uint64);
break;
case VAL_cstr:
kprintf("%d: type:%d size:%" PRIxSIZE " v:'%s'\n",__LINE__,v->type,v->size,v->as.ptr);
break;
case VAL_data:
kprintf("%d: type:%d size:%" PRIxSIZE " v:\n",__LINE__,v->type,v->size);
hexdump(v->as.ptr, 16);
break;
}
}
#endif
static DIE *
di_read_die(DebugInfoReader *reader, DIE *die)
{
uint64_t abbrev_number = uleb128(&reader->p);
if (abbrev_number == 0) {
reader->level--;
return NULL;
}
if (!(reader->q = di_find_abbrev(reader, abbrev_number))) return NULL;
die->pos = reader->p - reader->obj->debug_info.ptr - 1;
die->tag = (int)uleb128(&reader->q); /* tag */
die->has_children = *reader->q++; /* has_children */
if (die->has_children) {
reader->level++;
}
return die;
}
static DebugInfoValue *
di_read_record(DebugInfoReader *reader, DebugInfoValue *vp)
{
uint64_t at = uleb128(&reader->q);
uint64_t form = uleb128(&reader->q);
if (!at || !form) return NULL;
vp->at = at;
vp->form = form;
if (!debug_info_reader_read_value(reader, form, vp)) return NULL;
return vp;
}
static bool
di_skip_records(DebugInfoReader *reader)
{
for (;;) {
DebugInfoValue v = {{0}};
uint64_t at = uleb128(&reader->q);
uint64_t form = uleb128(&reader->q);
if (!at || !form) return true;
if (!debug_info_reader_read_value(reader, form, &v)) return false;
}
}
typedef struct addr_header {
const char *ptr;
uint64_t unit_length;
uint8_t format;
uint8_t address_size;
/* uint8_t segment_selector_size; */
} addr_header_t;
static bool
addr_header_init(obj_info_t *obj, addr_header_t *header) {
const char *p = obj->debug_addr.ptr;
header->ptr = p;
if (!p) return true;
header->unit_length = *(uint32_t *)p;
p += sizeof(uint32_t);
header->format = 4;
if (header->unit_length == 0xffffffff) {
header->unit_length = *(uint64_t *)p;
p += sizeof(uint64_t);
header->format = 8;
}
p += 2; /* version */
header->address_size = *p++;
if (header->address_size != 4 && header->address_size != 8) {
kprintf("unknown address_size:%d", header->address_size);
return false;
}
p++; /* segment_selector_size */
return true;
}
static uint64_t
read_addr(addr_header_t *header, uint64_t addr_base, uint64_t idx) {
if (header->address_size == 4) {
return ((uint32_t*)(header->ptr + addr_base))[idx];
}
else {
return ((uint64_t*)(header->ptr + addr_base))[idx];
}
}
typedef struct rnglists_header {
uint64_t unit_length;
uint8_t format;
uint8_t address_size;
uint32_t offset_entry_count;
} rnglists_header_t;
static bool
rnglists_header_init(obj_info_t *obj, rnglists_header_t *header) {
const char *p = obj->debug_rnglists.ptr;
if (!p) return true;
header->unit_length = *(uint32_t *)p;
p += sizeof(uint32_t);
header->format = 4;
if (header->unit_length == 0xffffffff) {
header->unit_length = *(uint64_t *)p;
p += sizeof(uint64_t);
header->format = 8;
}
p += 2; /* version */
header->address_size = *p++;
if (header->address_size != 4 && header->address_size != 8) {
kprintf("unknown address_size:%d", header->address_size);
return false;
}
p++; /* segment_selector_size */
header->offset_entry_count = *(uint32_t *)p;
return true;
}
typedef struct {
uint64_t low_pc;
uint64_t high_pc;
uint64_t ranges;
bool low_pc_set;
bool high_pc_set;
bool ranges_set;
} ranges_t;
static void
ranges_set(ranges_t *ptr, DebugInfoValue *v, addr_header_t *addr_header, uint64_t addr_base)
{
uint64_t n = 0;
if (v->type == VAL_uint) {
n = v->as.uint64;
}
else if (v->type == VAL_addr) {
n = read_addr(addr_header, addr_base, v->as.addr_idx);
}
switch (v->at) {
case DW_AT_low_pc:
ptr->low_pc = n;
ptr->low_pc_set = true;
break;
case DW_AT_high_pc:
if (v->form == DW_FORM_addr) {
ptr->high_pc = n;
}
else {
ptr->high_pc = ptr->low_pc + n;
}
ptr->high_pc_set = true;
break;
case DW_AT_ranges:
ptr->ranges = n;
ptr->ranges_set = true;
break;
}
}
static uint64_t
read_dw_form_addr(DebugInfoReader *reader, const char **ptr)
{
const char *p = *ptr;
*ptr = p + reader->address_size;
if (reader->address_size == 4) {
return read_uint32(&p);
} else {
return read_uint64(&p);
}
}
static uintptr_t
ranges_include(DebugInfoReader *reader, ranges_t *ptr, uint64_t addr, rnglists_header_t *rnglists_header)
{
if (ptr->high_pc_set) {
if (ptr->ranges_set || !ptr->low_pc_set) {
return UINTPTR_MAX;
}
if (ptr->low_pc <= addr && addr <= ptr->high_pc) {
return (uintptr_t)ptr->low_pc;
}
}
else if (ptr->ranges_set) {
/* TODO: support base address selection entry */
const char *p;
uint64_t base = ptr->low_pc_set ? ptr->low_pc : reader->current_low_pc;
bool base_valid = true;
if (reader->current_version >= 5) {
if (rnglists_header->offset_entry_count == 0) {
// DW_FORM_sec_offset
p = reader->obj->debug_rnglists.ptr + ptr->ranges + reader->current_rnglists_base;
}
else {
// DW_FORM_rnglistx
const char *offset_array = reader->obj->debug_rnglists.ptr + reader->current_rnglists_base;
if (rnglists_header->format == 4) {
p = offset_array + ((uint32_t *)offset_array)[ptr->ranges];
}
else {
p = offset_array + ((uint64_t *)offset_array)[ptr->ranges];
}
}
for (;;) {
uint8_t rle = read_uint8(&p);
uintptr_t from = 0, to = 0;
if (rle == DW_RLE_end_of_list) break;
switch (rle) {
case DW_RLE_base_addressx:
uleb128(&p);
base_valid = false; /* not supported yet */
break;
case DW_RLE_startx_endx:
uleb128(&p);
uleb128(&p);
break;
case DW_RLE_startx_length:
uleb128(&p);
uleb128(&p);
break;
case DW_RLE_offset_pair:
if (!base_valid) break;
from = (uintptr_t)base + uleb128(&p);
to = (uintptr_t)base + uleb128(&p);
break;
case DW_RLE_base_address:
base = read_dw_form_addr(reader, &p);
base_valid = true;
break;
case DW_RLE_start_end:
from = (uintptr_t)read_dw_form_addr(reader, &p);
to = (uintptr_t)read_dw_form_addr(reader, &p);
break;
case DW_RLE_start_length:
from = (uintptr_t)read_dw_form_addr(reader, &p);
to = from + uleb128(&p);
break;
}
if (from <= addr && addr < to) {
return from;
}
}
return 0;
}
p = reader->obj->debug_ranges.ptr + ptr->ranges;
for (;;) {
uintptr_t from = read_uintptr(&p);
uintptr_t to = read_uintptr(&p);
if (!from && !to) break;
if (from == UINTPTR_MAX) {
/* base address selection entry */
base = to;
}
else if (base + from <= addr && addr < base + to) {
return (uintptr_t)base + from;
}
}
}
else if (ptr->low_pc_set) {
if (ptr->low_pc == addr) {
return (uintptr_t)ptr->low_pc;
}
}
return 0;
}
#if 0
static void
ranges_inspect(DebugInfoReader *reader, ranges_t *ptr)
{
if (ptr->high_pc_set) {
if (ptr->ranges_set || !ptr->low_pc_set) {
kprintf("low_pc_set:%d high_pc_set:%d ranges_set:%d\n",ptr->low_pc_set,ptr->high_pc_set,ptr->ranges_set);
return;
}
kprintf("low_pc:%"PRIx64" high_pc:%"PRIx64"\n",ptr->low_pc,ptr->high_pc);
}
else if (ptr->ranges_set) {
char *p = reader->obj->debug_ranges.ptr + ptr->ranges;
kprintf("low_pc:%"PRIx64" ranges:%"PRIx64" %lx ",ptr->low_pc,ptr->ranges, p-reader->obj->mapped);
for (;;) {
uintptr_t from = read_uintptr(&p);
uintptr_t to = read_uintptr(&p);
if (!from && !to) break;
kprintf("%"PRIx64"-%"PRIx64" ",ptr->low_pc+from,ptr->low_pc+to);
}
kprintf("\n");
}
else if (ptr->low_pc_set) {
kprintf("low_pc:%"PRIx64"\n",ptr->low_pc);
}
else {
kprintf("empty\n");
}
}
#endif
static int
di_read_cu(DebugInfoReader *reader)
{
uint64_t unit_length;
uint16_t version;
uint64_t debug_abbrev_offset;
reader->format = 4;
reader->current_cu = reader->p;
unit_length = read_uint32(&reader->p);
if (unit_length == 0xffffffff) {
unit_length = read_uint64(&reader->p);
reader->format = 8;
}
reader->cu_end = reader->p + unit_length;
version = read_uint16(&reader->p);
reader->current_version = version;
if (version > 5) {
return -1;
}
else if (version == 5) {
/* unit_type = */ read_uint8(&reader->p);
reader->address_size = read_uint8(&reader->p);
debug_abbrev_offset = read_uint(reader);
}
else {
debug_abbrev_offset = read_uint(reader);
reader->address_size = read_uint8(&reader->p);
}
if (reader->address_size != 4 && reader->address_size != 8) {
kprintf("unknown address_size:%d", reader->address_size);
return -1;
}
reader->q0 = reader->obj->debug_abbrev.ptr + debug_abbrev_offset;
reader->level = 0;
di_read_debug_abbrev_cu(reader);
if (di_read_debug_line_cu(reader)) return -1;
do {
DIE die;
if (!di_read_die(reader, &die)) continue;
if (die.tag != DW_TAG_compile_unit) {
if (!di_skip_records(reader)) return -1;
break;
}
reader->current_str_offsets_base = 0;
reader->current_addr_base = 0;
reader->current_rnglists_base = 0;
DebugInfoValue low_pc = {{0}};
/* enumerate abbrev */
for (;;) {
DebugInfoValue v = {{0}};
if (!di_read_record(reader, &v)) break;
switch (v.at) {
case DW_AT_low_pc:
// clang may output DW_AT_addr_base after DW_AT_low_pc.
// We need to resolve the DW_FORM_addr* after DW_AT_addr_base is parsed.
low_pc = v;
break;
case DW_AT_str_offsets_base:
reader->current_str_offsets_base = v.as.uint64;
break;
case DW_AT_addr_base:
reader->current_addr_base = v.as.uint64;
break;
case DW_AT_rnglists_base:
reader->current_rnglists_base = v.as.uint64;
break;
}
}
// Resolve the DW_FORM_addr of DW_AT_low_pc
switch (low_pc.type) {
case VAL_uint:
reader->current_low_pc = low_pc.as.uint64;
break;
case VAL_addr:
{
addr_header_t header = {0};
if (!addr_header_init(reader->obj, &header)) return -1;
reader->current_low_pc = read_addr(&header, reader->current_addr_base, low_pc.as.addr_idx);
}
break;
}
} while (0);
return 0;
}
static void
read_abstract_origin(DebugInfoReader *reader, uint64_t form, uint64_t abstract_origin, line_info_t *line)
{
const char *p = reader->p;
const char *q = reader->q;
int level = reader->level;
DIE die;
switch (form) {
case DW_FORM_ref1:
case DW_FORM_ref2:
case DW_FORM_ref4:
case DW_FORM_ref8:
case DW_FORM_ref_udata:
reader->p = reader->current_cu + abstract_origin;
break;
case DW_FORM_ref_addr:
goto finish; /* not supported yet */
case DW_FORM_ref_sig8:
goto finish; /* not supported yet */
case DW_FORM_ref_sup4:
case DW_FORM_ref_sup8:
goto finish; /* not supported yet */
default:
goto finish;
}
if (!di_read_die(reader, &die)) goto finish;
/* enumerate abbrev */
for (;;) {
DebugInfoValue v = {{0}};
if (!di_read_record(reader, &v)) break;
switch (v.at) {
case DW_AT_name:
line->sname = get_cstr_value(&v);
break;
}
}
finish:
reader->p = p;
reader->q = q;
reader->level = level;
}
static bool
debug_info_read(DebugInfoReader *reader, int num_traces, void **traces,
line_info_t *lines, int offset) {
addr_header_t addr_header = {0};
if (!addr_header_init(reader->obj, &addr_header)) return false;
rnglists_header_t rnglists_header = {0};
if (!rnglists_header_init(reader->obj, &rnglists_header)) return false;
while (reader->p < reader->cu_end) {
DIE die;
ranges_t ranges = {0};
line_info_t line = {0};
if (!di_read_die(reader, &die)) continue;
/* kprintf("%d:%tx: <%d>\n",__LINE__,die.pos,reader->level,die.tag); */
if (die.tag != DW_TAG_subprogram && die.tag != DW_TAG_inlined_subroutine) {
skip_die:
if (!di_skip_records(reader)) return false;
continue;
}
/* enumerate abbrev */
for (;;) {
DebugInfoValue v = {{0}};
/* ptrdiff_t pos = reader->p - reader->p0; */
if (!di_read_record(reader, &v)) break;
/* kprintf("\n%d:%tx: AT:%lx FORM:%lx\n",__LINE__,pos,v.at,v.form); */
/* div_inspect(&v); */
switch (v.at) {
case DW_AT_name:
line.sname = get_cstr_value(&v);
break;
case DW_AT_call_file:
fill_filename((int)v.as.uint64, reader->debug_line_format, reader->debug_line_version, reader->debug_line_directories, reader->debug_line_files, &line, reader->obj);
break;
case DW_AT_call_line:
line.line = (int)v.as.uint64;
break;
case DW_AT_low_pc:
case DW_AT_high_pc:
case DW_AT_ranges:
ranges_set(&ranges, &v, &addr_header, reader->current_addr_base);
break;
case DW_AT_declaration:
goto skip_die;
case DW_AT_inline:
/* 1 or 3 */
break; /* goto skip_die; */
case DW_AT_abstract_origin:
read_abstract_origin(reader, v.form, v.as.uint64, &line);
break; /* goto skip_die; */
}
}
/* ranges_inspect(reader, &ranges); */
/* kprintf("%d:%tx: %x ",__LINE__,diepos,die.tag); */
for (int i=offset; i < num_traces; i++) {
uintptr_t addr = (uintptr_t)traces[i];
uintptr_t offset = addr - reader->obj->base_addr + reader->obj->vmaddr;
uintptr_t saddr = ranges_include(reader, &ranges, offset, &rnglists_header);
if (saddr == UINTPTR_MAX) return false;
if (saddr) {
/* kprintf("%d:%tx: %d %lx->%lx %x %s: %s/%s %d %s %s %s\n",__LINE__,die.pos, i,addr,offset, die.tag,line.sname,line.dirname,line.filename,line.line,reader->obj->path,line.sname,lines[i].sname); */
if (lines[i].sname) {
line_info_t *lp = malloc(sizeof(line_info_t));
memcpy(lp, &lines[i], sizeof(line_info_t));
lines[i].next = lp;
lp->dirname = line.dirname;
lp->filename = line.filename;
lp->line = line.line;
lp->saddr = 0;
}
lines[i].path = reader->obj->path;
lines[i].base_addr = line.base_addr;
lines[i].sname = line.sname;
lines[i].saddr = saddr + reader->obj->base_addr - reader->obj->vmaddr;
}
}
}
return true;
}
// This function parses the following attributes of Line Number Program Header in DWARF 5:
//
// * directory_entry_format_count
// * directory_entry_format
// * directories_count
// * directories
//
// or
//
// * file_name_entry_format_count
// * file_name_entry_format
// * file_names_count
// * file_names
//
// It records DW_LNCT_path and DW_LNCT_directory_index at the index "idx".
static const char *
parse_ver5_debug_line_header(const char *p, int idx, uint8_t format, obj_info_t *obj, const char **out_path, uint64_t *out_directory_index) {
int i, j;
int entry_format_count = *(uint8_t *)p++;
const char *entry_format = p;
/* skip the part of entry_format */
for (i = 0; i < entry_format_count * 2; i++) uleb128(&p);
int entry_count = (int)uleb128(&p);
DebugInfoReader reader = {0};
debug_info_reader_init(&reader, obj);
reader.format = format;
reader.p = p;
for (j = 0; j < entry_count; j++) {
const char *format = entry_format;
for (i = 0; i < entry_format_count; i++) {
DebugInfoValue v = {{0}};
unsigned long dw_lnct = uleb128(&format);
unsigned long dw_form = uleb128(&format);
if (!debug_info_reader_read_value(&reader, dw_form, &v)) return 0;
if (dw_lnct == 1 /* DW_LNCT_path */ && v.type == VAL_cstr && out_path)
*out_path = v.as.ptr + v.off;
if (dw_lnct == 2 /* DW_LNCT_directory_index */ && v.type == VAL_uint && out_directory_index)
*out_directory_index = v.as.uint64;
}
if (j == idx) return 0;
}
return reader.p;
}
#ifdef USE_ELF
static unsigned long
uncompress_debug_section(ElfW(Shdr) *shdr, char *file, char **ptr)
{
*ptr = NULL;
#ifdef SUPPORT_COMPRESSED_DEBUG_LINE
ElfW(Chdr) *chdr = (ElfW(Chdr) *)(file + shdr->sh_offset);
unsigned long destsize = chdr->ch_size;
int ret = 0;
if (chdr->ch_type != ELFCOMPRESS_ZLIB) {
/* unsupported compression type */
return 0;
}
*ptr = malloc(destsize);
if (!*ptr) return 0;
ret = uncompress((Bytef *)*ptr, &destsize,
(const Bytef*)chdr + sizeof(ElfW(Chdr)),
shdr->sh_size - sizeof(ElfW(Chdr)));
if (ret != Z_OK) goto fail;
return destsize;
fail:
free(*ptr);
*ptr = NULL;
#endif
return 0;
}
/* read file and fill lines */
static uintptr_t
fill_lines(int num_traces, void **traces, int check_debuglink,
obj_info_t **objp, line_info_t *lines, int offset)
{
int i, j;
char *shstr;
ElfW(Ehdr) *ehdr;
ElfW(Shdr) *shdr, *shstr_shdr;
ElfW(Shdr) *gnu_debuglink_shdr = NULL;
ElfW(Shdr) *note_gnu_build_id = NULL;
int fd;
off_t filesize;
char *file;
ElfW(Shdr) *symtab_shdr = NULL, *strtab_shdr = NULL;
ElfW(Shdr) *dynsym_shdr = NULL, *dynstr_shdr = NULL;
obj_info_t *obj = *objp;
uintptr_t dladdr_fbase = 0;
fd = open(binary_filename, O_RDONLY);
if (fd < 0) {
goto fail;
}
filesize = lseek(fd, 0, SEEK_END);
if (filesize < 0) {
int e = errno;
close(fd);
kprintf("lseek: %s\n", strerror(e));
goto fail;
}
#if SIZEOF_OFF_T > SIZEOF_SIZE_T
if (filesize > (off_t)SIZE_MAX) {
close(fd);
kprintf("Too large file %s\n", binary_filename);
goto fail;
}
#endif
lseek(fd, 0, SEEK_SET);
/* async-signal unsafe */
file = (char *)mmap(NULL, (size_t)filesize, PROT_READ, MAP_SHARED, fd, 0);
if (file == MAP_FAILED) {
int e = errno;
close(fd);
kprintf("mmap: %s\n", strerror(e));
goto fail;
}
close(fd);
ehdr = (ElfW(Ehdr) *)file;
if (memcmp(ehdr->e_ident, "\177ELF", 4) != 0) {
/*
* Huh? Maybe filename was overridden by setproctitle() and
* it match non-elf file.
*/
goto fail;
}
obj->mapped = file;
obj->mapped_size = (size_t)filesize;
shdr = (ElfW(Shdr) *)(file + ehdr->e_shoff);
shstr_shdr = shdr + ehdr->e_shstrndx;
shstr = file + shstr_shdr->sh_offset;
for (i = 0; i < ehdr->e_shnum; i++) {
char *section_name = shstr + shdr[i].sh_name;
switch (shdr[i].sh_type) {
case SHT_STRTAB:
if (!strcmp(section_name, ".strtab")) {
strtab_shdr = shdr + i;
}
else if (!strcmp(section_name, ".dynstr")) {
dynstr_shdr = shdr + i;
}
break;
case SHT_SYMTAB:
/* if (!strcmp(section_name, ".symtab")) */
symtab_shdr = shdr + i;
break;
case SHT_DYNSYM:
/* if (!strcmp(section_name, ".dynsym")) */
dynsym_shdr = shdr + i;
break;
case SHT_NOTE:
if (!strcmp(section_name, ".note.gnu.build-id")) {
note_gnu_build_id = shdr + i;
}
break;
case SHT_PROGBITS:
if (!strcmp(section_name, ".gnu_debuglink")) {
gnu_debuglink_shdr = shdr + i;
}
else {
const char *debug_section_names[] = {
".debug_abbrev",
".debug_info",
".debug_line",
".debug_ranges",
".debug_str_offsets",
".debug_addr",
".debug_rnglists",
".debug_str",
".debug_line_str"
};
for (j=0; j < DWARF_SECTION_COUNT; j++) {
struct dwarf_section *s = obj_dwarf_section_at(obj, j);
if (strcmp(section_name, debug_section_names[j]) != 0)
continue;
s->ptr = file + shdr[i].sh_offset;
s->size = shdr[i].sh_size;
s->flags = shdr[i].sh_flags;
if (s->flags & SHF_COMPRESSED) {
s->size = uncompress_debug_section(&shdr[i], file, &s->ptr);
if (!s->size) goto fail;
}
break;
}
}
break;
}
}
if (offset == -1) {
/* main executable */
offset = 0;
if (dynsym_shdr && dynstr_shdr) {
char *strtab = file + dynstr_shdr->sh_offset;
ElfW(Sym) *symtab = (ElfW(Sym) *)(file + dynsym_shdr->sh_offset);
int symtab_count = (int)(dynsym_shdr->sh_size / sizeof(ElfW(Sym)));
void *handle = dlopen(NULL, RTLD_NOW|RTLD_LOCAL);
if (handle) {
for (j = 0; j < symtab_count; j++) {
ElfW(Sym) *sym = &symtab[j];
Dl_info info;
void *s;
if (ELF_ST_TYPE(sym->st_info) != STT_FUNC || sym->st_size == 0) continue;
s = dlsym(handle, strtab + sym->st_name);
if (s && dladdr(s, &info)) {
obj->base_addr = dladdr_fbase;
dladdr_fbase = (uintptr_t)info.dli_fbase;
break;
}
}
dlclose(handle);
}
if (ehdr->e_type == ET_EXEC) {
obj->base_addr = 0;
}
else {
/* PIE (position-independent executable) */
obj->base_addr = dladdr_fbase;
}
}
}
if (obj->debug_info.ptr && obj->debug_abbrev.ptr) {
DebugInfoReader reader;
debug_info_reader_init(&reader, obj);
i = 0;
while (reader.p < reader.pend) {
/* kprintf("%d:%tx: CU[%d]\n", __LINE__, reader.p - reader.obj->debug_info.ptr, i++); */
if (di_read_cu(&reader)) goto use_symtab;
if (!debug_info_read(&reader, num_traces, traces, lines, offset))
goto use_symtab;
}
}
else {
/* This file doesn't have dwarf, use symtab or dynsym */
use_symtab:
if (!symtab_shdr) {
/* This file doesn't have symtab, use dynsym instead */
symtab_shdr = dynsym_shdr;
strtab_shdr = dynstr_shdr;
}
if (symtab_shdr && strtab_shdr) {
char *strtab = file + strtab_shdr->sh_offset;
ElfW(Sym) *symtab = (ElfW(Sym) *)(file + symtab_shdr->sh_offset);
int symtab_count = (int)(symtab_shdr->sh_size / sizeof(ElfW(Sym)));
for (j = 0; j < symtab_count; j++) {
ElfW(Sym) *sym = &symtab[j];
uintptr_t saddr = (uintptr_t)sym->st_value + obj->base_addr;
if (ELF_ST_TYPE(sym->st_info) != STT_FUNC) continue;
for (i = offset; i < num_traces; i++) {
uintptr_t d = (uintptr_t)traces[i] - saddr;
if (lines[i].line > 0 || d > (uintptr_t)sym->st_size)
continue;
/* fill symbol name and addr from .symtab */
if (!lines[i].sname) lines[i].sname = strtab + sym->st_name;
lines[i].saddr = saddr;
lines[i].path = obj->path;
lines[i].base_addr = obj->base_addr;
}
}
}
}
if (!obj->debug_line.ptr) {
/* This file doesn't have .debug_line section,
let's check .gnu_debuglink section instead. */
if (gnu_debuglink_shdr && check_debuglink) {
follow_debuglink(file + gnu_debuglink_shdr->sh_offset,
num_traces, traces,
objp, lines, offset);
}
if (note_gnu_build_id && check_debuglink) {
ElfW(Nhdr) *nhdr = (ElfW(Nhdr)*) (file + note_gnu_build_id->sh_offset);
const char *build_id = (char *)(nhdr + 1) + nhdr->n_namesz;
follow_debuglink_build_id(build_id, nhdr->n_descsz,
num_traces, traces,
objp, lines, offset);
}
goto finish;
}
if (parse_debug_line(num_traces, traces,
obj->debug_line.ptr,
obj->debug_line.size,
obj, lines, offset) == -1)
goto fail;
finish:
return dladdr_fbase;
fail:
return (uintptr_t)-1;
}
#else /* Mach-O */
/* read file and fill lines */
static uintptr_t
fill_lines(int num_traces, void **traces, int check_debuglink,
obj_info_t **objp, line_info_t *lines, int offset)
{
# ifdef __LP64__
# define LP(x) x##_64
# else
# define LP(x) x
# endif
int fd;
off_t filesize;
char *file, *p = NULL;
obj_info_t *obj = *objp;
struct LP(mach_header) *header;
uintptr_t dladdr_fbase = 0;
{
char *s = binary_filename;
char *base = strrchr(binary_filename, '/')+1;
size_t max = PATH_MAX;
size_t size = strlen(binary_filename);
size_t basesize = size - (base - binary_filename);
s += size;
max -= size;
p = s;
size = strlcpy(s, ".dSYM/Contents/Resources/DWARF/", max);
if (size == 0) goto fail;
s += size;
max -= size;
if (max <= basesize) goto fail;
memcpy(s, base, basesize);
s[basesize] = 0;
fd = open(binary_filename, O_RDONLY);
if (fd < 0) {
*p = 0; /* binary_filename becomes original file name */
fd = open(binary_filename, O_RDONLY);
if (fd < 0) {
goto fail;
}
}
}
filesize = lseek(fd, 0, SEEK_END);
if (filesize < 0) {
int e = errno;
close(fd);
kprintf("lseek: %s\n", strerror(e));
goto fail;
}
#if SIZEOF_OFF_T > SIZEOF_SIZE_T
if (filesize > (off_t)SIZE_MAX) {
close(fd);
kprintf("Too large file %s\n", binary_filename);
goto fail;
}
#endif
lseek(fd, 0, SEEK_SET);
/* async-signal unsafe */
file = (char *)mmap(NULL, (size_t)filesize, PROT_READ, MAP_SHARED, fd, 0);
if (file == MAP_FAILED) {
int e = errno;
close(fd);
kprintf("mmap: %s\n", strerror(e));
goto fail;
}
close(fd);
obj->mapped = file;
obj->mapped_size = (size_t)filesize;
header = (struct LP(mach_header) *)file;
if (header->magic == LP(MH_MAGIC)) {
/* non universal binary */
p = file;
}
else if (header->magic == FAT_CIGAM) {
struct LP(mach_header) *mhp = _NSGetMachExecuteHeader();
struct fat_header *fat = (struct fat_header *)file;
char *q = file + sizeof(*fat);
uint32_t nfat_arch = __builtin_bswap32(fat->nfat_arch);
/* kprintf("%d: fat:%s %d\n",__LINE__, binary_filename,nfat_arch); */
for (uint32_t i = 0; i < nfat_arch; i++) {
struct fat_arch *arch = (struct fat_arch *)q;
cpu_type_t cputype = __builtin_bswap32(arch->cputype);
cpu_subtype_t cpusubtype = __builtin_bswap32(arch->cpusubtype);
uint32_t offset = __builtin_bswap32(arch->offset);
/* kprintf("%d: fat %d %x/%x %x/%x\n",__LINE__, i, mhp->cputype,mhp->cpusubtype, cputype,cpusubtype); */
if (mhp->cputype == cputype &&
(cpu_subtype_t)(mhp->cpusubtype & ~CPU_SUBTYPE_MASK) == cpusubtype) {
p = file + offset;
file = p;
header = (struct LP(mach_header) *)p;
if (header->magic == LP(MH_MAGIC)) {
goto found_mach_header;
}
break;
}
q += sizeof(*arch);
}
kprintf("'%s' is not a Mach-O universal binary file!\n",binary_filename);
close(fd);
goto fail;
}
else {
kprintf("'%s' is not a "
# ifdef __LP64__
"64"
# else
"32"
# endif
"-bit Mach-O file!\n",binary_filename);
close(fd);
goto fail;
}
found_mach_header:
p += sizeof(*header);
for (uint32_t i = 0; i < (uint32_t)header->ncmds; i++) {
struct load_command *lcmd = (struct load_command *)p;
switch (lcmd->cmd) {
case LP(LC_SEGMENT):
{
static const char *debug_section_names[] = {
"__debug_abbrev",
"__debug_info",
"__debug_line",
"__debug_ranges",
"__debug_str_offsets",
"__debug_addr",
"__debug_rnglists",
"__debug_str",
"__debug_line_str",
};
struct LP(segment_command) *scmd = (struct LP(segment_command) *)lcmd;
if (strcmp(scmd->segname, "__TEXT") == 0) {
obj->vmaddr = scmd->vmaddr;
}
else if (strcmp(scmd->segname, "__DWARF") == 0) {
p += sizeof(struct LP(segment_command));
for (uint64_t i = 0; i < scmd->nsects; i++) {
struct LP(section) *sect = (struct LP(section) *)p;
p += sizeof(struct LP(section));
for (int j=0; j < DWARF_SECTION_COUNT; j++) {
struct dwarf_section *s = obj_dwarf_section_at(obj, j);
if (strcmp(sect->sectname, debug_section_names[j]) != 0)
continue;
s->ptr = file + sect->offset;
s->size = sect->size;
s->flags = sect->flags;
if (s->flags & SHF_COMPRESSED) {
goto fail;
}
break;
}
}
}
}
break;
case LC_SYMTAB:
{
struct symtab_command *cmd = (struct symtab_command *)lcmd;
struct LP(nlist) *nl = (struct LP(nlist) *)(file + cmd->symoff);
char *strtab = file + cmd->stroff, *sname = 0;
uint32_t j;
uintptr_t saddr = 0;
/* kprintf("[%2d]: %x/symtab %p\n", i, cmd->cmd, (void *)p); */
for (j = 0; j < cmd->nsyms; j++) {
uintptr_t symsize, d;
struct LP(nlist) *e = &nl[j];
/* kprintf("[%2d][%4d]: %02x/%x/%x: %s %llx\n", i, j, e->n_type,e->n_sect,e->n_desc,strtab+e->n_un.n_strx,e->n_value); */
if (e->n_type != N_FUN) continue;
if (e->n_sect) {
saddr = (uintptr_t)e->n_value + obj->base_addr - obj->vmaddr;
sname = strtab + e->n_un.n_strx;
/* kprintf("[%2d][%4d]: %02x/%x/%x: %s %llx\n", i, j, e->n_type,e->n_sect,e->n_desc,strtab+e->n_un.n_strx,e->n_value); */
continue;
}
for (int k = offset; k < num_traces; k++) {
d = (uintptr_t)traces[k] - saddr;
symsize = e->n_value;
/* kprintf("%lx %lx %lx\n",saddr,symsize,traces[k]); */
if (lines[k].line > 0 || d > (uintptr_t)symsize)
continue;
/* fill symbol name and addr from .symtab */
if (!lines[k].sname) lines[k].sname = sname;
lines[k].saddr = saddr;
lines[k].path = obj->path;
lines[k].base_addr = obj->base_addr;
}
}
}
}
p += lcmd->cmdsize;
}
if (obj->debug_info.ptr && obj->debug_abbrev.ptr) {
DebugInfoReader reader;
debug_info_reader_init(&reader, obj);
while (reader.p < reader.pend) {
if (di_read_cu(&reader)) goto fail;
if (!debug_info_read(&reader, num_traces, traces, lines, offset))
goto fail;
}
}
if (parse_debug_line(num_traces, traces,
obj->debug_line.ptr,
obj->debug_line.size,
obj, lines, offset) == -1)
goto fail;
return dladdr_fbase;
fail:
return (uintptr_t)-1;
}
#endif
#define HAVE_MAIN_EXE_PATH
#if defined(__FreeBSD__) || defined(__DragonFly__)
# include <sys/sysctl.h>
#endif
/* ssize_t main_exe_path(void)
*
* store the path of the main executable to `binary_filename`,
* and returns strlen(binary_filename).
* it is NUL terminated.
*/
#if defined(__linux__) || defined(__NetBSD__)
static ssize_t
main_exe_path(void)
{
# if defined(__linux__)
# define PROC_SELF_EXE "/proc/self/exe"
# elif defined(__NetBSD__)
# define PROC_SELF_EXE "/proc/curproc/exe"
# endif
ssize_t len = readlink(PROC_SELF_EXE, binary_filename, PATH_MAX);
if (len < 0) return 0;
binary_filename[len] = 0;
return len;
}
#elif defined(__FreeBSD__) || defined(__DragonFly__)
static ssize_t
main_exe_path(void)
{
int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
size_t len = PATH_MAX;
int err = sysctl(mib, 4, binary_filename, &len, NULL, 0);
if (err) {
kprintf("Can't get the path of ruby");
return -1;
}
len--; /* sysctl sets strlen+1 */
return len;
}
#elif defined(HAVE_LIBPROC_H)
static ssize_t
main_exe_path(void)
{
int len = proc_pidpath(getpid(), binary_filename, PATH_MAX);
if (len == 0) return 0;
binary_filename[len] = 0;
return len;
}
#else
#undef HAVE_MAIN_EXE_PATH
#endif
static void
print_line0(line_info_t *line, void *address)
{
uintptr_t addr = (uintptr_t)address;
uintptr_t d = addr - line->saddr;
if (!address) {
/* inlined */
if (line->dirname && line->dirname[0]) {
kprintf("%s(%s) %s/%s:%d\n", line->path, line->sname, line->dirname, line->filename, line->line);
}
else {
kprintf("%s(%s) %s:%d\n", line->path, line->sname, line->filename, line->line);
}
}
else if (!line->path) {
kprintf("[0x%"PRIxPTR"]\n", addr);
}
else if (!line->sname) {
kprintf("%s(0x%"PRIxPTR") [0x%"PRIxPTR"]\n", line->path, addr-line->base_addr, addr);
}
else if (!line->saddr) {
kprintf("%s(%s) [0x%"PRIxPTR"]\n", line->path, line->sname, addr);
}
else if (line->line <= 0) {
kprintf("%s(%s+0x%"PRIxPTR") [0x%"PRIxPTR"]\n", line->path, line->sname,
d, addr);
}
else if (!line->filename) {
kprintf("%s(%s+0x%"PRIxPTR") [0x%"PRIxPTR"] ???:%d\n", line->path, line->sname,
d, addr, line->line);
}
else if (line->dirname && line->dirname[0]) {
kprintf("%s(%s+0x%"PRIxPTR") [0x%"PRIxPTR"] %s/%s:%d\n", line->path, line->sname,
d, addr, line->dirname, line->filename, line->line);
}
else {
kprintf("%s(%s+0x%"PRIxPTR") [0x%"PRIxPTR"] %s:%d\n", line->path, line->sname,
d, addr, line->filename, line->line);
}
}
static void
print_line(line_info_t *line, void *address)
{
print_line0(line, address);
if (line->next) {
print_line(line->next, NULL);
}
}
void
rb_dump_backtrace_with_lines(int num_traces, void **traces)
{
int i;
/* async-signal unsafe */
line_info_t *lines = (line_info_t *)calloc(num_traces, sizeof(line_info_t));
obj_info_t *obj = NULL;
/* 2 is NULL + main executable */
void **dladdr_fbases = (void **)calloc(num_traces+2, sizeof(void *));
#ifdef HAVE_MAIN_EXE_PATH
char *main_path = NULL; /* used on printing backtrace */
ssize_t len;
if ((len = main_exe_path()) > 0) {
main_path = (char *)alloca(len + 1);
if (main_path) {
uintptr_t addr;
memcpy(main_path, binary_filename, len+1);
append_obj(&obj);
obj->path = main_path;
addr = fill_lines(num_traces, traces, 1, &obj, lines, -1);
if (addr != (uintptr_t)-1) {
dladdr_fbases[0] = (void *)addr;
}
}
}
#endif
/* fill source lines by reading dwarf */
for (i = 0; i < num_traces; i++) {
Dl_info info;
if (lines[i].line) continue;
if (dladdr(traces[i], &info)) {
const char *path;
void **p;
/* skip symbols which is in already checked objects */
/* if the binary is strip-ed, this may effect */
for (p=dladdr_fbases; *p; p++) {
if (*p == info.dli_fbase) {
if (info.dli_fname) lines[i].path = info.dli_fname;
if (info.dli_sname) lines[i].sname = info.dli_sname;
goto next_line;
}
}
*p = info.dli_fbase;
append_obj(&obj);
obj->base_addr = (uintptr_t)info.dli_fbase;
path = info.dli_fname;
obj->path = path;
if (path) lines[i].path = path;
if (info.dli_sname) {
lines[i].sname = info.dli_sname;
lines[i].saddr = (uintptr_t)info.dli_saddr;
}
strlcpy(binary_filename, path, PATH_MAX);
if (fill_lines(num_traces, traces, 1, &obj, lines, i) == (uintptr_t)-1)
break;
}
next_line:
continue;
}
/* output */
for (i = 0; i < num_traces; i++) {
print_line(&lines[i], traces[i]);
/* FreeBSD's backtrace may show _start and so on */
if (lines[i].sname && strcmp("main", lines[i].sname) == 0)
break;
}
/* free */
while (obj) {
obj_info_t *o = obj;
for (i=0; i < DWARF_SECTION_COUNT; i++) {
struct dwarf_section *s = obj_dwarf_section_at(obj, i);
if (s->flags & SHF_COMPRESSED) {
free(s->ptr);
}
}
if (obj->mapped_size) {
munmap(obj->mapped, obj->mapped_size);
}
obj = o->next;
free(o);
}
for (i = 0; i < num_traces; i++) {
line_info_t *line = lines[i].next;
while (line) {
line_info_t *l = line;
line = line->next;
free(l);
}
}
free(lines);
free(dladdr_fbases);
}
#undef kprintf
#else /* defined(USE_ELF) */
#error not supported
#endif
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