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atosl.c
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atosl.c
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/*
* Copyright (c) 2013, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <errno.h>
#include <unistd.h>
#include <fcntl.h>
#undef NDEBUG
#include <assert.h>
#include <arpa/inet.h>
#include <string.h>
#include <getopt.h>
#include <libgen.h>
#include <limits.h>
#include <dwarf.h>
#include <libdwarf.h>
#include "atosl.h"
#include "subprograms.h"
#include "common.h"
#define VERSION ATOSL_VERSION
#define DWARF_ASSERT(ret, err) \
do { \
if (ret == DW_DLV_ERROR) { \
fatal("dwarf_errmsg: %s", dwarf_errmsg(err)); \
} \
} while (0);
extern char *
cplus_demangle (const char *mangled, int options);
typedef unsigned long Dwarf_Word;
Dwarf_Unsigned
_dwarf_decode_u_leb128(Dwarf_Small * leb128,
Dwarf_Word * leb128_length);
#define DECODE_LEB128_UWORD(ptr, value) \
do { \
Dwarf_Word uleblen; \
value = _dwarf_decode_u_leb128(ptr,&uleblen); \
ptr += uleblen; \
} while (0)
static int debug = 0;
static const char *shortopts = "vl:o:A:gcC:VhD";
static struct option longopts[] = {
{"verbose", no_argument, NULL, 'v'},
{"load-address", required_argument, NULL, 'l'},
{"no-demangle", no_argument, NULL, 'D'},
{"dsym", required_argument, NULL, 'o'},
{"arch", required_argument, NULL, 'A'},
{"globals", no_argument, NULL, 'g'},
{"no-cache", no_argument, NULL, 'c'},
{"cache-dir", required_argument, NULL, 'C'},
{"version", no_argument, NULL, 'V'},
{"help", no_argument, NULL, 'h'},
{NULL, 0, NULL, 0}
};
static struct {
const char *name;
cpu_type_t type;
cpu_subtype_t subtype;
} arch_str_to_type[] = {
{"i386", CPU_TYPE_I386, CPU_SUBTYPE_X86_ALL},
{"armv6", CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V6},
{"armv7", CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7},
{"armv7s", CPU_TYPE_ARM, CPU_SUBTYPE_ARM_V7S},
{"arm64", CPU_TYPE_ARM64, CPU_SUBTYPE_ARM64_ALL},
{"arm64e", CPU_TYPE_ARM64, CPU_SUBTYPE_ARM64E}
};
struct symbol_t {
const char *name;
union {
struct nlist_t sym32;
struct nlist_64 sym64;
} sym;
Dwarf_Addr addr;
int thumb:1;
};
struct function_t {
const char *name;
Dwarf_Addr addr;
};
/* Various addresses, parsed from the cmdline or the mach-o sections */
static struct {
Dwarf_Addr load_address;
int use_globals;
int use_cache;
const char *dsym_filename;
cpu_type_t cpu_type;
cpu_subtype_t cpu_subtype;
const char *cache_dir;
int should_demangle;
} options = {
.load_address = LONG_MAX,
.use_globals = 0,
.use_cache = 1,
.cpu_type = CPU_TYPE_ARM,
.cpu_subtype = CPU_SUBTYPE_ARM_V7S,
.should_demangle = 1,
};
typedef int dwarf_mach_handle;
struct dwarf_section_t;
struct dwarf_section_t {
struct section_t mach_section;
struct dwarf_section_t *next;
};
struct dwarf_section_64_t;
struct dwarf_section_64_t {
struct section_64_t mach_section;
struct dwarf_section_64_t *next;
};
static struct {
/* Symbols from symtab */
struct symbol_t *symlist;
uint32_t nsymbols;
struct dwarf_subprogram_t *subprograms;
Dwarf_Addr intended_addr;
Dwarf_Addr linkedit_addr;
struct fat_arch_t arch;
uint8_t uuid[UUID_LEN];
uint8_t is_64;
uint8_t is_dwarf;
} context;
typedef struct {
dwarf_mach_handle handle;
Dwarf_Small length_size;
Dwarf_Small pointer_size;
Dwarf_Endianness endianness;
Dwarf_Unsigned section_count;
struct dwarf_section_t *sections;
struct dwarf_section_64_t *sections_64;
} dwarf_mach_object_access_internals_t;
void print_help(void)
{
fprintf(stderr, "atosl %s\n", VERSION);
fprintf(stderr, USAGE "\n");
fprintf(stderr, "\n");
fprintf(stderr,
" -o, --dsym=FILE\t\tfile to find symbols in\n");
fprintf(stderr,
" -v, --verbose\t\t\tenable verbose (debug) messages\n");
fprintf(stderr,
" -l, --load-address=ADDRESS\tspecify application load address\n");
fprintf(stderr,
" -A, --arch=ARCH\t\tspecify architecture\n");
fprintf(stderr,
" -g, --globals\t\t\tlookup symbols using global section\n");
fprintf(stderr,
" -c, --no-cache\t\tdon't cache debugging information\n");
fprintf(stderr,
" -D, --no-demangle\t\tdon't demangle symbols\n");
fprintf(stderr,
" -V, --version\t\t\tget current version\n");
fprintf(stderr,
" -h, --help\t\t\tthis help\n");
fprintf(stderr, "\n");
}
void dwarf_error_handler(Dwarf_Error err, Dwarf_Ptr ptr)
{
fatal("dwarf error: %s", dwarf_errmsg(err));
}
char *demangle(const char *sym)
{
char *demangled = NULL;
if (debug)
fprintf(stderr, "Unmangled name: %s\n", sym);
if (strncmp(sym, "_Z", 2) == 0)
demangled = cplus_demangle(sym, 0);
else if (strncmp(sym, "__Z", 3) == 0)
demangled = cplus_demangle(sym+1, 0);
return demangled;
}
int parse_uuid(dwarf_mach_object_access_internals_t *obj, uint32_t cmdsize)
{
int i;
int ret;
ret = _read(obj->handle, context.uuid, UUID_LEN);
if (ret < 0)
fatal_file(ret);
if (debug) {
fprintf(stderr, "%10s ", "uuid");
for (i = 0; i < UUID_LEN; i++) {
fprintf(stderr, "%.02x", context.uuid[i]);
}
fprintf(stderr, "\n");
}
return 0;
}
int parse_section(dwarf_mach_object_access_internals_t *obj)
{
int ret;
struct dwarf_section_t *s;
s = malloc(sizeof(*s));
if (!s)
fatal("unable to allocate memory");
memset(s, 0, sizeof(*s));
ret = _read(obj->handle, &s->mach_section, sizeof(s->mach_section));
if (ret < 0)
fatal_file(ret);
if (debug) {
fprintf(stderr, "Section\n");
fprintf(stderr, "%10s %s\n", "sectname", s->mach_section.sectname);
fprintf(stderr, "%10s %s\n", "segname", s->mach_section.segname);
fprintf(stderr, "%10s 0x%.08x\n", "addr", s->mach_section.addr);
fprintf(stderr, "%10s 0x%.08x\n", "size", s->mach_section.size);
fprintf(stderr, "%10s %d\n", "offset", s->mach_section.offset);
/* TODO: what is the second value here? */
fprintf(stderr, "%10s 2^%d (?)\n", "align", s->mach_section.align);
fprintf(stderr, "%10s %d\n", "reloff", s->mach_section.reloff);
fprintf(stderr, "%10s %d\n", "nreloc", s->mach_section.nreloc);
fprintf(stderr, "%10s 0x%.08x\n", "flags", s->mach_section.flags);
fprintf(stderr, "%10s %d\n", "reserved1", s->mach_section.reserved1);
fprintf(stderr, "%10s %d\n", "reserved2", s->mach_section.reserved2);
}
struct dwarf_section_t *sec = obj->sections;
if (!sec)
obj->sections = s;
else {
while (sec) {
if (sec->next == NULL) {
sec->next = s;
break;
} else {
sec = sec->next;
}
}
}
obj->section_count++;
return 0;
}
int parse_section_64(dwarf_mach_object_access_internals_t *obj)
{
int ret;
struct dwarf_section_64_t *s;
s = malloc(sizeof(*s));
if (!s)
fatal("unable to allocate memory");
memset(s, 0, sizeof(*s));
ret = _read(obj->handle, &s->mach_section, sizeof(s->mach_section));
if (ret < 0)
fatal_file(ret);
if (debug) {
fprintf(stderr, "Section\n");
fprintf(stderr, "%10s %s\n", "sectname", s->mach_section.sectname);
fprintf(stderr, "%10s %s\n", "segname", s->mach_section.segname);
fprintf(stderr, "%10s 0x%.8llx\n", "addr", (unsigned long long)s->mach_section.addr);
fprintf(stderr, "%10s 0x%.8llx\n", "size", (unsigned long long)s->mach_section.size);
fprintf(stderr, "%10s %d\n", "offset", s->mach_section.offset);
/* TODO: what is the second value here? */
fprintf(stderr, "%10s 2^%d (?)\n", "align", s->mach_section.align);
fprintf(stderr, "%10s %d\n", "reloff", s->mach_section.reloff);
fprintf(stderr, "%10s %d\n", "nreloc", s->mach_section.nreloc);
fprintf(stderr, "%10s 0x%.08x\n", "flags", s->mach_section.flags);
fprintf(stderr, "%10s %d\n", "reserved1", s->mach_section.reserved1);
fprintf(stderr, "%10s %d\n", "reserved2", s->mach_section.reserved2);
fprintf(stderr, "%10s %d\n", "reserved3", s->mach_section.reserved3);
}
struct dwarf_section_64_t *sec = obj->sections_64;
if (!sec) {
obj->sections_64 = s;
} else {
while (sec) {
if (sec->next == NULL) {
sec->next = s;
break;
} else {
sec = sec->next;
}
}
}
obj->section_count++;
return 0;
}
int parse_segment(dwarf_mach_object_access_internals_t *obj, uint32_t cmdsize)
{
int err;
int ret;
struct segment_command_t segment;
int i;
ret = _read(obj->handle, &segment, sizeof(segment));
if (ret < 0)
fatal_file(ret);
if (debug) {
fprintf(stderr, "Segment: %s\n", segment.segname);
fprintf(stderr, "\tvmaddr: 0x%.08x\n", segment.vmaddr);
fprintf(stderr, "\tvmsize: %d\n", segment.vmsize);
fprintf(stderr, "\tfileoff: 0x%.08x\n", segment.fileoff);
fprintf(stderr, "\tfilesize: %d\n", segment.filesize);
fprintf(stderr, "\tmaxprot: %d\n", segment.maxprot);
fprintf(stderr, "\tinitprot: %d\n", segment.initprot);
fprintf(stderr, "\tnsects: %d\n", segment.nsects);
fprintf(stderr, "\tflags: %.08x\n", segment.flags);
}
if (strcmp(segment.segname, "__TEXT") == 0) {
context.intended_addr = segment.vmaddr;
}
if (strcmp(segment.segname, "__LINKEDIT") == 0) {
context.linkedit_addr = segment.fileoff;
}
if (strcmp(segment.segname, "__DWARF") == 0) {
context.is_dwarf = 1;
}
for (i = 0; i < segment.nsects; i++) {
err = parse_section(obj);
if (err)
fatal("unable to parse section in `%s`", segment.segname);
}
return 0;
}
int parse_segment_64(dwarf_mach_object_access_internals_t *obj, uint32_t cmdsize)
{
int err;
int ret;
struct segment_command_64_t segment;
int i;
ret = _read(obj->handle, &segment, sizeof(segment));
if (ret < 0)
fatal_file(ret);
if (debug) {
fprintf(stderr, "Segment: %s\n", segment.segname);
fprintf(stderr, "\tvmaddr: 0x%.8llx\n", (unsigned long long)segment.vmaddr);
fprintf(stderr, "\tvmsize: %llu\n", (unsigned long long)segment.vmsize);
fprintf(stderr, "\tfileoff: 0x%.8llx\n", (unsigned long long)segment.fileoff);
fprintf(stderr, "\tfilesize: %llu\n", (unsigned long long)segment.filesize);
fprintf(stderr, "\tmaxprot: %d\n", segment.maxprot);
fprintf(stderr, "\tinitprot: %d\n", segment.initprot);
fprintf(stderr, "\tnsects: %d\n", segment.nsects);
fprintf(stderr, "\tflags: %.08x\n", segment.flags);
}
if (strcmp(segment.segname, "__TEXT") == 0) {
context.intended_addr = segment.vmaddr;
}
if (strcmp(segment.segname, "__LINKEDIT") == 0) {
context.linkedit_addr = segment.fileoff;
}
if (strcmp(segment.segname, "__DWARF") == 0) {
context.is_dwarf = 1;
}
for (i = 0; i < segment.nsects; i++) {
err = parse_section_64(obj);
if (err)
fatal("unable to parse section in `%s`", segment.segname);
}
return 0;
}
int parse_symtab(dwarf_mach_object_access_internals_t *obj, uint32_t cmdsize)
{
int ret;
off_t pos;
int i;
char *strtable;
struct symtab_command_t symtab;
struct symbol_t *current;
ret = _read(obj->handle, &symtab, sizeof(symtab));
if (ret < 0)
fatal_file(ret);
if (debug) {
fprintf(stderr, "Symbol\n");
fprintf(stderr, "%10s %.08x\n", "symoff", symtab.symoff);
fprintf(stderr, "%10s %d\n", "nsyms", symtab.nsyms);
fprintf(stderr, "%10s %.08x\n", "stroff", symtab.stroff);
fprintf(stderr, "%10s %d\n", "strsize", symtab.strsize);
}
strtable = malloc(symtab.strsize);
if (!strtable)
fatal("unable to allocate memory");
pos = lseek(obj->handle, 0, SEEK_CUR);
if (pos < 0)
fatal("error seeking: %s", strerror(errno));
ret = lseek(obj->handle, context.arch.offset+symtab.stroff, SEEK_SET);
if (ret < 0)
fatal("error seeking: %s", strerror(errno));
ret = _read(obj->handle, strtable, symtab.strsize);
if (ret < 0)
fatal_file(ret);
ret = lseek(obj->handle, context.arch.offset+symtab.symoff, SEEK_SET);
if (ret < 0)
fatal("error seeking: %s", strerror(errno));
context.nsymbols = symtab.nsyms;
context.symlist = malloc(sizeof(struct symbol_t) * symtab.nsyms);
if (!context.symlist)
fatal("unable to allocate memory");
current = context.symlist;
for (i = 0; i < symtab.nsyms; i++) {
ret = _read(obj->handle, context.is_64 ? (void*)¤t->sym.sym64 : (void*)¤t->sym.sym32, context.is_64 ? sizeof(current->sym.sym64) : sizeof(current->sym.sym32));
if (ret < 0)
fatal_file(ret);
if (context.is_64 ? current->sym.sym64.n_un.n_strx : current->sym.sym32.n_un.n_strx) {
if ((context.is_64 ? current->sym.sym64.n_un.n_strx : current->sym.sym32.n_un.n_strx) > symtab.strsize)
fatal("str offset (%d) greater than strsize (%d)",
(context.is_64 ? current->sym.sym64.n_un.n_strx : current->sym.sym32.n_un.n_strx), symtab.strsize);
current->name = strtable+(context.is_64 ? current->sym.sym64.n_un.n_strx : current->sym.sym32.n_un.n_strx);
}
current++;
}
ret = lseek(obj->handle, pos, SEEK_SET);
if (ret < 0)
fatal("error seeking: %s", strerror(errno));
return 0;
}
static int compare_symbols(const void *a, const void *b)
{
struct symbol_t *sym_a = (struct symbol_t *)a;
struct symbol_t *sym_b = (struct symbol_t *)b;
return sym_a->addr - sym_b->addr;
}
void print_symbol(const char *symbol, unsigned offset)
{
char *demangled = options.should_demangle ? demangle(symbol) : NULL;
const char *name = demangled ? demangled : symbol;
if (name[0] == '_')
name++;
printf("%s%s (in %s) + %d\n",
name,
demangled ? "()" : "",
basename((char *)options.dsym_filename),
offset);
if (demangled)
free(demangled);
}
/* Print symbol name based on stabs information.
* Currently only handles functions (N_FUN stabs)
*
* See README.stabs for stabs format information.
*
* Here we find pairs of N_FUN stabs. The first has the name of the function and its starting address;
* the second has its size.
*
* We could also symbolicate global and static symbols (N_GSYM and N_STSYM) here,
* but it's not necessary to do so since they'll be picked up by the generic symbol table
* search later in this function.
*
* Return 1 if a symbol corresponding to search_addr was found; 0 otherwise.
*/
int handle_stabs_symbol(int is_fun_stab, Dwarf_Addr search_addr, const struct symbol_t *symbol)
{
/* These are static since they need to persist across pairs of symbols. */
static const char *last_fun_name = NULL;
static Dwarf_Addr last_addr;
if (is_fun_stab) {
if (last_fun_name) { /* if this is non-null, the last symbol was an N_FUN stab as well. */
if (debug)
fprintf(stderr, "\t\tSecond consecutive N_FUN symbol. Function size: %llu (0x%llx)\n",
symbol->addr, symbol->addr);
if (last_addr <= search_addr
&& search_addr < last_addr + symbol->addr) {
print_symbol(last_fun_name, (unsigned int)(search_addr - last_addr));
return 1;
} else if (debug)
fprintf(stderr, "\t\tNot printing symbol %s; 0x%llx not in the interval [0x%llx 0x%llx).\n",
last_fun_name, search_addr, last_addr, last_addr + symbol->addr);
last_fun_name = NULL;
} else { /* last_fun_name is null, so this is the first N_FUN in (possibly) a pair. */
last_fun_name = symbol->name;
if (debug)
fprintf(stderr, "\t\tFirst consecutive N_FUN symbol. Function name: %s; addr: 0x%llx\n",
symbol->name, symbol->addr);
}
} else {
if (debug && last_fun_name) {
fprintf(stderr, "%s", "\t\tN_FUN symbol not part of a pair! Ignoring.\n");
fprintf(stderr, "Name: %s, addr: 0x%llx (%llu)\n", last_fun_name, last_addr, last_addr);
}
last_fun_name = NULL;
}
last_addr = symbol->addr;
return 0;
}
int find_and_print_symtab_symbol(Dwarf_Addr slide, Dwarf_Addr addr)
{
union {
struct nlist_t nlist32;
struct nlist_64 nlist64;
} nlist;
struct symbol_t *current;
int found = 0;
int i;
int is_stab;
uint8_t type;
addr = addr - slide;
current = context.symlist;
for (i = 0; i < context.nsymbols; i++) {
memcpy(context.is_64 ? (void*)&nlist.nlist64 : (void*)&nlist.nlist32, context.is_64 ? (void*)¤t->sym.sym64 : (void*)¤t->sym.sym32, context.is_64 ? sizeof(current->sym.sym64) : sizeof(current->sym.sym32));
current->thumb = ((context.is_64 ? nlist.nlist64.n_desc : nlist.nlist32.n_desc) & N_ARM_THUMB_DEF) ? 1 : 0;
current->addr = context.is_64 ? nlist.nlist64.n_value : nlist.nlist32.n_value;
type = context.is_64 ? nlist.nlist64.n_type : nlist.nlist32.n_type;
is_stab = type & N_STAB;
if (debug) {
fprintf(stderr, "\t\tname: %s\n", current->name);
fprintf(stderr, "\t\tn_un.n_un.n_strx: %d\n", context.is_64 ? nlist.nlist64.n_un.n_strx : nlist.nlist32.n_un.n_strx);
fprintf(stderr, "\t\traw n_type: 0x%x\n", context.is_64 ? nlist.nlist64.n_type : nlist.nlist32.n_type);
fprintf(stderr, "\t\tn_type: ");
if (is_stab)
fprintf(stderr, "N_STAB ");
if ((context.is_64 ? nlist.nlist64.n_type : nlist.nlist32.n_type) & N_PEXT)
fprintf(stderr, "N_PEXT ");
if ((context.is_64 ? nlist.nlist64.n_type : nlist.nlist32.n_type) & N_EXT)
fprintf(stderr, "N_EXT ");
fprintf(stderr, "\n");
fprintf(stderr, "\t\tType: ");
switch (type & N_TYPE) {
case 0: fprintf(stderr, "U "); break;
case N_ABS: fprintf(stderr, "A "); break;
case N_SECT: fprintf(stderr, "S "); break;
case N_INDR: fprintf(stderr, "I "); break;
}
fprintf(stderr, "\n");
fprintf(stderr, "\t\tn_sect: %d\n", context.is_64 ? nlist.nlist64.n_sect : nlist.nlist32.n_sect);
fprintf(stderr, "\t\tn_desc: %d\n", context.is_64 ? nlist.nlist64.n_desc : nlist.nlist32.n_desc);
fprintf(stderr, "\t\tn_value: 0x%llx\n", (unsigned long long)(context.is_64 ? nlist.nlist64.n_value : nlist.nlist32.n_value));
fprintf(stderr, "\t\taddr: 0x%llx\n", current->addr);
}
if (handle_stabs_symbol(is_stab && type == N_FUN, addr, current))
return DW_DLV_OK;
current++;
if (debug)
fprintf(stderr, "\n");
}
qsort(context.symlist, context.nsymbols, sizeof(*current), compare_symbols);
current = context.symlist;
for (i = 0; i < context.nsymbols; i++) {
if (current->addr > addr) {
if (i < 1) {
/* Someone is asking about a symbol that comes before the first
* one we know about. In that case we don't have a match for
* them */
break;
}
struct symbol_t *prev = (current - 1);
print_symbol(prev->name, (unsigned int)(addr - prev->addr));
found = 1;
break;
}
current++;
}
return found ? DW_DLV_OK : DW_DLV_NO_ENTRY;
}
int parse_command(
dwarf_mach_object_access_internals_t *obj,
struct load_command_t load_command)
{
int ret = 0;
int cmdsize;
switch (load_command.cmd) {
case LC_UUID:
ret = parse_uuid(obj, load_command.cmdsize);
break;
case LC_SEGMENT:
ret = parse_segment(obj, load_command.cmdsize);
break;
case LC_SEGMENT_64:
ret = parse_segment_64(obj, load_command.cmdsize);
break;
case LC_SYMTAB:
ret = parse_symtab(obj, load_command.cmdsize);
break;
default:
if (debug)
fprintf(stderr, "Warning: unhandled command: 0x%x\n",
load_command.cmd);
/* Fallthrough */
case LC_PREPAGE:
cmdsize = load_command.cmdsize - sizeof(load_command);
ret = lseek(obj->handle, cmdsize, SEEK_CUR);
if (ret < 0)
fatal("error seeking: %s", strerror(errno));
break;
}
return ret;
}
static int dwarf_mach_object_access_internals_init(
dwarf_mach_handle handle,
void *obj_in,
int *error)
{
int ret;
struct mach_header_t header;
struct load_command_t load_command;
int i;
dwarf_mach_object_access_internals_t *obj =
(dwarf_mach_object_access_internals_t *)obj_in;
obj->handle = handle;
obj->length_size = 4;
obj->pointer_size = 4;
obj->endianness = DW_OBJECT_LSB;
obj->sections = NULL;
obj->sections_64 = NULL;
ret = _read(obj->handle, &header, sizeof(header));
if (ret < 0)
fatal_file(ret);
// mask cpusubtype
header.cpusubtype &= ~CPU_SUBTYPE_MASK;
/* Need to skip 4 bytes of the reserved field of mach_header_64 */
if (header.cputype == CPU_TYPE_ARM64 && (header.cpusubtype == CPU_SUBTYPE_ARM64_ALL || header.cpusubtype == CPU_SUBTYPE_ARM64E)) {
context.is_64 = 1;
ret = lseek(obj->handle, sizeof(uint32_t), SEEK_CUR);
if (ret < 0)
fatal_file(ret);
}
if (debug) {
fprintf(stderr, "Mach Header:\n");
fprintf(stderr, "\tCPU Type: %d\n", header.cputype);
fprintf(stderr, "\tCPU Subtype: %d\n", header.cpusubtype);
fprintf(stderr, "\tFiletype: %d\n", header.filetype);
fprintf(stderr, "\tNumber of Cmds: %d\n", header.ncmds);
fprintf(stderr, "\tSize of commands: %d\n", header.sizeofcmds);
fprintf(stderr, "\tFlags: %.08x\n", header.flags);
}
switch (header.filetype) {
case MH_DSYM:
if (debug)
fprintf(stderr, "File type: debug file\n");
break;
case MH_DYLIB:
if (debug)
fprintf(stderr, "File type: dynamic library\n");
break;
case MH_DYLIB_STUB:
if (debug)
fprintf(stderr, "File type: dynamic library stub\n");
break;
case MH_EXECUTE:
if (debug)
fprintf(stderr, "File type: executable file\n");
break;
case MH_DYLINKER:
if (debug)
fprintf(stderr, "File type: dyld file\n");
break;
case MH_FILESET:
if (debug)
fprintf(stderr, "File type: file set\n");
break;
default:
fatal("unsupported file type: 0x%x", header.filetype);
assert(0);
}
for (i = 0; i < header.ncmds; i++) {
ret = _read(obj->handle, &load_command, sizeof(load_command));
if (ret < 0)
fatal_file(ret);
if (debug) {
fprintf(stderr, "Load Command %d\n", i);
fprintf(stderr, "%10s %x\n", "cmd", load_command.cmd);
fprintf(stderr, "%10s %d\n", "cmdsize", load_command.cmdsize);
}
ret = parse_command(obj, load_command);
if (ret < 0)
fatal("unable to parse command %x", load_command.cmd);
}
return DW_DLV_OK;
}
static Dwarf_Endianness dwarf_mach_object_access_get_byte_order(void *obj_in)
{
dwarf_mach_object_access_internals_t *obj =
(dwarf_mach_object_access_internals_t *)obj_in;
return obj->endianness;
}
static Dwarf_Unsigned dwarf_mach_object_access_get_section_count(void *obj_in)
{
dwarf_mach_object_access_internals_t *obj =
(dwarf_mach_object_access_internals_t *)obj_in;
return obj->section_count;
}
static int dwarf_mach_object_access_get_section_info(
void *obj_in,
Dwarf_Half section_index,
Dwarf_Obj_Access_Section *ret_scn,
int *error)
{
int i;
dwarf_mach_object_access_internals_t *obj =
(dwarf_mach_object_access_internals_t *)obj_in;
if (section_index >= obj->section_count) {
*error = DW_DLE_MDE;
return DW_DLV_ERROR;
}
if (obj->sections_64) {
struct dwarf_section_64_t *sec = obj->sections_64;
for (i = 0; i < section_index; i++) {
sec = sec->next;
}
sec->mach_section.sectname[1] = '.';
ret_scn->size = sec->mach_section.size;
ret_scn->addr = sec->mach_section.addr;
ret_scn->name = sec->mach_section.sectname+1;
} else {
struct dwarf_section_t *sec = obj->sections;
for (i = 0; i < section_index; i++) {
sec = sec->next;
}
sec->mach_section.sectname[1] = '.';
ret_scn->size = sec->mach_section.size;
ret_scn->addr = sec->mach_section.addr;
ret_scn->name = sec->mach_section.sectname+1;
}
if (strcmp(ret_scn->name, ".debug_pubnames__DWARF") == 0)
ret_scn->name = ".debug_pubnames";
ret_scn->link = 0; /* rela section or from symtab to strtab */
ret_scn->entrysize = 0;
return DW_DLV_OK;
}
static int dwarf_mach_object_access_load_section(
void *obj_in,
Dwarf_Half section_index,
Dwarf_Small **section_data,
int *error)
{
void *addr;
int i;
int ret;
dwarf_mach_object_access_internals_t *obj =
(dwarf_mach_object_access_internals_t *)obj_in;
if (section_index >= obj->section_count) {
*error = DW_DLE_MDE;
return DW_DLV_ERROR;
}
if (obj->sections_64) {
struct dwarf_section_64_t *sec = obj->sections_64;
for (i = 0; i < section_index; i++) {
sec = sec->next;
}
addr = malloc(sec->mach_section.size);
if (!addr)
fatal("unable to allocate memory");
ret = lseek(obj->handle, context.arch.offset + sec->mach_section.offset, SEEK_SET);
if (ret < 0)
fatal("error seeking: %s", strerror(errno));
ret = _read(obj->handle, addr, sec->mach_section.size);
if (ret < 0)
fatal_file(ret);
} else {
struct dwarf_section_t *sec = obj->sections;
for (i = 0; i < section_index; i++) {
sec = sec->next;
}
addr = malloc(sec->mach_section.size);
if (!addr)
fatal("unable to allocate memory");
ret = lseek(obj->handle, context.arch.offset + sec->mach_section.offset, SEEK_SET);
if (ret < 0)
fatal("error seeking: %s", strerror(errno));
ret = _read(obj->handle, addr, sec->mach_section.size);
if (ret < 0)
fatal_file(ret);
}
*section_data = addr;
return DW_DLV_OK;
}
static int dwarf_mach_object_relocate_a_section(
void *obj_in,
Dwarf_Half section_index,
Dwarf_Debug dbg,
int *error)
{
return DW_DLV_NO_ENTRY;
}
static Dwarf_Small dwarf_mach_object_access_get_length_size(void *obj_in)
{
dwarf_mach_object_access_internals_t *obj =
(dwarf_mach_object_access_internals_t *)obj_in;
return obj->length_size;
}
static Dwarf_Small dwarf_mach_object_access_get_pointer_size(void *obj_in)
{
dwarf_mach_object_access_internals_t *obj =
(dwarf_mach_object_access_internals_t *)obj_in;
return obj->pointer_size;
}
static const struct Dwarf_Obj_Access_Methods_s
dwarf_mach_object_access_methods = {
dwarf_mach_object_access_get_section_info,
dwarf_mach_object_access_get_byte_order,
dwarf_mach_object_access_get_length_size,
dwarf_mach_object_access_get_pointer_size,
dwarf_mach_object_access_get_section_count,
dwarf_mach_object_access_load_section,
dwarf_mach_object_relocate_a_section
};
void dwarf_mach_object_access_init(
dwarf_mach_handle handle,
Dwarf_Obj_Access_Interface **ret_obj,
int *err)
{
int res = 0;
dwarf_mach_object_access_internals_t *internals = NULL;
Dwarf_Obj_Access_Interface *intfc = NULL;
internals = malloc(sizeof(*internals));
if (!internals)
fatal("unable to allocate memory");
memset(internals, 0, sizeof(*internals));
res = dwarf_mach_object_access_internals_init(handle, internals, err);
if (res != DW_DLV_OK)
fatal("error initializing dwarf internals");
intfc = malloc(sizeof(Dwarf_Obj_Access_Interface));
if (!intfc)
fatal("unable to allocate memory");
intfc->object = internals;
intfc->methods = &dwarf_mach_object_access_methods;
*ret_obj = intfc;
}
void dwarf_mach_object_access_finish(Dwarf_Obj_Access_Interface *obj)
{
if (!obj)
return;
if (obj->object)
free(obj->object);
free(obj);
}
struct dwarf_subprogram_t *lookup_symbol(Dwarf_Addr addr)
{
struct dwarf_subprogram_t *subprogram = context.subprograms;
while (subprogram) {
if ((addr >= subprogram->lowpc) &&
(addr < subprogram->highpc)) {
return subprogram;
}
subprogram = subprogram->next;
}
return NULL;
}
int print_subprogram_symbol(Dwarf_Addr slide, Dwarf_Addr addr)
{
char *demangled = NULL;
addr -= slide;
struct dwarf_subprogram_t *match = lookup_symbol(addr);
if (match) {
demangled = options.should_demangle ? demangle(match->name) : NULL;
printf("%s (in %s) + %d\n",
demangled ?: match->name,
basename((char *)options.dsym_filename),
(unsigned int)(addr - match->lowpc));
if (demangled)
free(demangled);
}
return match ? 0 : -1;
}
int print_dwarf_symbol(Dwarf_Debug dbg, Dwarf_Addr slide, Dwarf_Addr addr)
{
static Dwarf_Arange *arange_buf = NULL;
Dwarf_Line *linebuf = NULL;
Dwarf_Signed linecount = 0;