393 lines
7.4 KiB
C
393 lines
7.4 KiB
C
|
#include "dso.h"
|
||
|
|
#include "symbol.h"
|
||
|
|
#include "symsrc.h"
|
||
|
|
|
||
|
|
#include <errno.h>
|
||
|
|
#include <unistd.h>
|
||
|
|
#include <stdio.h>
|
||
|
|
#include <fcntl.h>
|
||
|
|
#include <string.h>
|
||
|
|
#include <stdlib.h>
|
||
|
|
#include <byteswap.h>
|
||
|
|
#include <sys/stat.h>
|
||
|
|
#include <linux/zalloc.h>
|
||
|
|
#include <internal/lib.h>
|
||
|
|
|
||
|
|
static bool check_need_swap(int file_endian)
|
||
|
|
{
|
||
|
|
const int data = 1;
|
||
|
|
u8 *check = (u8 *)&data;
|
||
|
|
int host_endian;
|
||
|
|
|
||
|
|
if (check[0] == 1)
|
||
|
|
host_endian = ELFDATA2LSB;
|
||
|
|
else
|
||
|
|
host_endian = ELFDATA2MSB;
|
||
|
|
|
||
|
|
return host_endian != file_endian;
|
||
|
|
}
|
||
|
|
|
||
|
|
#define NOTE_ALIGN(sz) (((sz) + 3) & ~3)
|
||
|
|
|
||
|
|
#define NT_GNU_BUILD_ID 3
|
||
|
|
|
||
|
|
static int read_build_id(void *note_data, size_t note_len, struct build_id *bid,
|
||
|
|
bool need_swap)
|
||
|
|
{
|
||
|
|
size_t size = sizeof(bid->data);
|
||
|
|
struct {
|
||
|
|
u32 n_namesz;
|
||
|
|
u32 n_descsz;
|
||
|
|
u32 n_type;
|
||
|
|
} *nhdr;
|
||
|
|
void *ptr;
|
||
|
|
|
||
|
|
ptr = note_data;
|
||
|
|
while (ptr < (note_data + note_len)) {
|
||
|
|
const char *name;
|
||
|
|
size_t namesz, descsz;
|
||
|
|
|
||
|
|
nhdr = ptr;
|
||
|
|
if (need_swap) {
|
||
|
|
nhdr->n_namesz = bswap_32(nhdr->n_namesz);
|
||
|
|
nhdr->n_descsz = bswap_32(nhdr->n_descsz);
|
||
|
|
nhdr->n_type = bswap_32(nhdr->n_type);
|
||
|
|
}
|
||
|
|
|
||
|
|
namesz = NOTE_ALIGN(nhdr->n_namesz);
|
||
|
|
descsz = NOTE_ALIGN(nhdr->n_descsz);
|
||
|
|
|
||
|
|
ptr += sizeof(*nhdr);
|
||
|
|
name = ptr;
|
||
|
|
ptr += namesz;
|
||
|
|
if (nhdr->n_type == NT_GNU_BUILD_ID &&
|
||
|
|
nhdr->n_namesz == sizeof("GNU")) {
|
||
|
|
if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
|
||
|
|
size_t sz = min(size, descsz);
|
||
|
|
memcpy(bid->data, ptr, sz);
|
||
|
|
memset(bid->data + sz, 0, size - sz);
|
||
|
|
bid->size = sz;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
ptr += descsz;
|
||
|
|
}
|
||
|
|
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
int filename__read_debuglink(const char *filename __maybe_unused,
|
||
|
|
char *debuglink __maybe_unused,
|
||
|
|
size_t size __maybe_unused)
|
||
|
|
{
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Just try PT_NOTE header otherwise fails
|
||
|
|
*/
|
||
|
|
int filename__read_build_id(const char *filename, struct build_id *bid)
|
||
|
|
{
|
||
|
|
FILE *fp;
|
||
|
|
int ret = -1;
|
||
|
|
bool need_swap = false;
|
||
|
|
u8 e_ident[EI_NIDENT];
|
||
|
|
size_t buf_size;
|
||
|
|
void *buf;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
fp = fopen(filename, "r");
|
||
|
|
if (fp == NULL)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (fread(e_ident, sizeof(e_ident), 1, fp) != 1)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
if (memcmp(e_ident, ELFMAG, SELFMAG) ||
|
||
|
|
e_ident[EI_VERSION] != EV_CURRENT)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
need_swap = check_need_swap(e_ident[EI_DATA]);
|
||
|
|
|
||
|
|
/* for simplicity */
|
||
|
|
fseek(fp, 0, SEEK_SET);
|
||
|
|
|
||
|
|
if (e_ident[EI_CLASS] == ELFCLASS32) {
|
||
|
|
Elf32_Ehdr ehdr;
|
||
|
|
Elf32_Phdr *phdr;
|
||
|
|
|
||
|
|
if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
if (need_swap) {
|
||
|
|
ehdr.e_phoff = bswap_32(ehdr.e_phoff);
|
||
|
|
ehdr.e_phentsize = bswap_16(ehdr.e_phentsize);
|
||
|
|
ehdr.e_phnum = bswap_16(ehdr.e_phnum);
|
||
|
|
}
|
||
|
|
|
||
|
|
buf_size = ehdr.e_phentsize * ehdr.e_phnum;
|
||
|
|
buf = malloc(buf_size);
|
||
|
|
if (buf == NULL)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
fseek(fp, ehdr.e_phoff, SEEK_SET);
|
||
|
|
if (fread(buf, buf_size, 1, fp) != 1)
|
||
|
|
goto out_free;
|
||
|
|
|
||
|
|
for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) {
|
||
|
|
void *tmp;
|
||
|
|
long offset;
|
||
|
|
|
||
|
|
if (need_swap) {
|
||
|
|
phdr->p_type = bswap_32(phdr->p_type);
|
||
|
|
phdr->p_offset = bswap_32(phdr->p_offset);
|
||
|
|
phdr->p_filesz = bswap_32(phdr->p_filesz);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (phdr->p_type != PT_NOTE)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
buf_size = phdr->p_filesz;
|
||
|
|
offset = phdr->p_offset;
|
||
|
|
tmp = realloc(buf, buf_size);
|
||
|
|
if (tmp == NULL)
|
||
|
|
goto out_free;
|
||
|
|
|
||
|
|
buf = tmp;
|
||
|
|
fseek(fp, offset, SEEK_SET);
|
||
|
|
if (fread(buf, buf_size, 1, fp) != 1)
|
||
|
|
goto out_free;
|
||
|
|
|
||
|
|
ret = read_build_id(buf, buf_size, bid, need_swap);
|
||
|
|
if (ret == 0)
|
||
|
|
ret = bid->size;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
Elf64_Ehdr ehdr;
|
||
|
|
Elf64_Phdr *phdr;
|
||
|
|
|
||
|
|
if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
if (need_swap) {
|
||
|
|
ehdr.e_phoff = bswap_64(ehdr.e_phoff);
|
||
|
|
ehdr.e_phentsize = bswap_16(ehdr.e_phentsize);
|
||
|
|
ehdr.e_phnum = bswap_16(ehdr.e_phnum);
|
||
|
|
}
|
||
|
|
|
||
|
|
buf_size = ehdr.e_phentsize * ehdr.e_phnum;
|
||
|
|
buf = malloc(buf_size);
|
||
|
|
if (buf == NULL)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
fseek(fp, ehdr.e_phoff, SEEK_SET);
|
||
|
|
if (fread(buf, buf_size, 1, fp) != 1)
|
||
|
|
goto out_free;
|
||
|
|
|
||
|
|
for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) {
|
||
|
|
void *tmp;
|
||
|
|
long offset;
|
||
|
|
|
||
|
|
if (need_swap) {
|
||
|
|
phdr->p_type = bswap_32(phdr->p_type);
|
||
|
|
phdr->p_offset = bswap_64(phdr->p_offset);
|
||
|
|
phdr->p_filesz = bswap_64(phdr->p_filesz);
|
||
|
|
}
|
||
|
|
|
||
|
|
if (phdr->p_type != PT_NOTE)
|
||
|
|
continue;
|
||
|
|
|
||
|
|
buf_size = phdr->p_filesz;
|
||
|
|
offset = phdr->p_offset;
|
||
|
|
tmp = realloc(buf, buf_size);
|
||
|
|
if (tmp == NULL)
|
||
|
|
goto out_free;
|
||
|
|
|
||
|
|
buf = tmp;
|
||
|
|
fseek(fp, offset, SEEK_SET);
|
||
|
|
if (fread(buf, buf_size, 1, fp) != 1)
|
||
|
|
goto out_free;
|
||
|
|
|
||
|
|
ret = read_build_id(buf, buf_size, bid, need_swap);
|
||
|
|
if (ret == 0)
|
||
|
|
ret = bid->size;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
out_free:
|
||
|
|
free(buf);
|
||
|
|
out:
|
||
|
|
fclose(fp);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
int sysfs__read_build_id(const char *filename, struct build_id *bid)
|
||
|
|
{
|
||
|
|
int fd;
|
||
|
|
int ret = -1;
|
||
|
|
struct stat stbuf;
|
||
|
|
size_t buf_size;
|
||
|
|
void *buf;
|
||
|
|
|
||
|
|
fd = open(filename, O_RDONLY);
|
||
|
|
if (fd < 0)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (fstat(fd, &stbuf) < 0)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
buf_size = stbuf.st_size;
|
||
|
|
buf = malloc(buf_size);
|
||
|
|
if (buf == NULL)
|
||
|
|
goto out;
|
||
|
|
|
||
|
|
if (read(fd, buf, buf_size) != (ssize_t) buf_size)
|
||
|
|
goto out_free;
|
||
|
|
|
||
|
|
ret = read_build_id(buf, buf_size, bid, false);
|
||
|
|
out_free:
|
||
|
|
free(buf);
|
||
|
|
out:
|
||
|
|
close(fd);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
|
||
|
|
enum dso_binary_type type)
|
||
|
|
{
|
||
|
|
int fd = open(name, O_RDONLY);
|
||
|
|
if (fd < 0)
|
||
|
|
goto out_errno;
|
||
|
|
|
||
|
|
ss->name = strdup(name);
|
||
|
|
if (!ss->name)
|
||
|
|
goto out_close;
|
||
|
|
|
||
|
|
ss->fd = fd;
|
||
|
|
ss->type = type;
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
out_close:
|
||
|
|
close(fd);
|
||
|
|
out_errno:
|
||
|
|
dso->load_errno = errno;
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool symsrc__possibly_runtime(struct symsrc *ss __maybe_unused)
|
||
|
|
{
|
||
|
|
/* Assume all sym sources could be a runtime image. */
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool symsrc__has_symtab(struct symsrc *ss __maybe_unused)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
void symsrc__destroy(struct symsrc *ss)
|
||
|
|
{
|
||
|
|
zfree(&ss->name);
|
||
|
|
close(ss->fd);
|
||
|
|
}
|
||
|
|
|
||
|
|
int dso__synthesize_plt_symbols(struct dso *dso __maybe_unused,
|
||
|
|
struct symsrc *ss __maybe_unused)
|
||
|
|
{
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int fd__is_64_bit(int fd)
|
||
|
|
{
|
||
|
|
u8 e_ident[EI_NIDENT];
|
||
|
|
|
||
|
|
if (lseek(fd, 0, SEEK_SET))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (readn(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (memcmp(e_ident, ELFMAG, SELFMAG) ||
|
||
|
|
e_ident[EI_VERSION] != EV_CURRENT)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
return e_ident[EI_CLASS] == ELFCLASS64;
|
||
|
|
}
|
||
|
|
|
||
|
|
enum dso_type dso__type_fd(int fd)
|
||
|
|
{
|
||
|
|
Elf64_Ehdr ehdr;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = fd__is_64_bit(fd);
|
||
|
|
if (ret < 0)
|
||
|
|
return DSO__TYPE_UNKNOWN;
|
||
|
|
|
||
|
|
if (ret)
|
||
|
|
return DSO__TYPE_64BIT;
|
||
|
|
|
||
|
|
if (readn(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
|
||
|
|
return DSO__TYPE_UNKNOWN;
|
||
|
|
|
||
|
|
if (ehdr.e_machine == EM_X86_64)
|
||
|
|
return DSO__TYPE_X32BIT;
|
||
|
|
|
||
|
|
return DSO__TYPE_32BIT;
|
||
|
|
}
|
||
|
|
|
||
|
|
int dso__load_sym(struct dso *dso, struct map *map __maybe_unused,
|
||
|
|
struct symsrc *ss,
|
||
|
|
struct symsrc *runtime_ss __maybe_unused,
|
||
|
|
int kmodule __maybe_unused)
|
||
|
|
{
|
||
|
|
struct build_id bid;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
ret = fd__is_64_bit(ss->fd);
|
||
|
|
if (ret >= 0)
|
||
|
|
dso->is_64_bit = ret;
|
||
|
|
|
||
|
|
if (filename__read_build_id(ss->name, &bid) > 0)
|
||
|
|
dso__set_build_id(dso, &bid);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int file__read_maps(int fd __maybe_unused, bool exe __maybe_unused,
|
||
|
|
mapfn_t mapfn __maybe_unused, void *data __maybe_unused,
|
||
|
|
bool *is_64_bit __maybe_unused)
|
||
|
|
{
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
int kcore_extract__create(struct kcore_extract *kce __maybe_unused)
|
||
|
|
{
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
void kcore_extract__delete(struct kcore_extract *kce __maybe_unused)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
int kcore_copy(const char *from_dir __maybe_unused,
|
||
|
|
const char *to_dir __maybe_unused)
|
||
|
|
{
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
void symbol__elf_init(void)
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
char *dso__demangle_sym(struct dso *dso __maybe_unused,
|
||
|
|
int kmodule __maybe_unused,
|
||
|
|
const char *elf_name __maybe_unused)
|
||
|
|
{
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
bool filename__has_section(const char *filename __maybe_unused, const char *sec __maybe_unused)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|