384 lines
7.2 KiB
C
384 lines
7.2 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include "symbol.h"
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#include "util.h"
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#include <errno.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <string.h>
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#include <byteswap.h>
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#include <sys/stat.h>
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static bool check_need_swap(int file_endian)
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{
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const int data = 1;
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u8 *check = (u8 *)&data;
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int host_endian;
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if (check[0] == 1)
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host_endian = ELFDATA2LSB;
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else
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host_endian = ELFDATA2MSB;
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return host_endian != file_endian;
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}
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#define NOTE_ALIGN(sz) (((sz) + 3) & ~3)
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#define NT_GNU_BUILD_ID 3
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static int read_build_id(void *note_data, size_t note_len, void *bf,
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size_t size, bool need_swap)
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{
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struct {
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u32 n_namesz;
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u32 n_descsz;
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u32 n_type;
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} *nhdr;
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void *ptr;
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ptr = note_data;
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while (ptr < (note_data + note_len)) {
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const char *name;
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size_t namesz, descsz;
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nhdr = ptr;
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if (need_swap) {
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nhdr->n_namesz = bswap_32(nhdr->n_namesz);
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nhdr->n_descsz = bswap_32(nhdr->n_descsz);
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nhdr->n_type = bswap_32(nhdr->n_type);
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}
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namesz = NOTE_ALIGN(nhdr->n_namesz);
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descsz = NOTE_ALIGN(nhdr->n_descsz);
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ptr += sizeof(*nhdr);
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name = ptr;
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ptr += namesz;
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if (nhdr->n_type == NT_GNU_BUILD_ID &&
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nhdr->n_namesz == sizeof("GNU")) {
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if (memcmp(name, "GNU", sizeof("GNU")) == 0) {
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size_t sz = min(size, descsz);
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memcpy(bf, ptr, sz);
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memset(bf + sz, 0, size - sz);
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return 0;
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}
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}
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ptr += descsz;
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}
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return -1;
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}
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int filename__read_debuglink(const char *filename __maybe_unused,
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char *debuglink __maybe_unused,
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size_t size __maybe_unused)
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{
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return -1;
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}
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/*
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* Just try PT_NOTE header otherwise fails
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*/
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int filename__read_build_id(const char *filename, void *bf, size_t size)
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{
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FILE *fp;
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int ret = -1;
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bool need_swap = false;
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u8 e_ident[EI_NIDENT];
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size_t buf_size;
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void *buf;
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int i;
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fp = fopen(filename, "r");
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if (fp == NULL)
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return -1;
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if (fread(e_ident, sizeof(e_ident), 1, fp) != 1)
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goto out;
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if (memcmp(e_ident, ELFMAG, SELFMAG) ||
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e_ident[EI_VERSION] != EV_CURRENT)
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goto out;
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need_swap = check_need_swap(e_ident[EI_DATA]);
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/* for simplicity */
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fseek(fp, 0, SEEK_SET);
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if (e_ident[EI_CLASS] == ELFCLASS32) {
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Elf32_Ehdr ehdr;
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Elf32_Phdr *phdr;
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if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
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goto out;
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if (need_swap) {
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ehdr.e_phoff = bswap_32(ehdr.e_phoff);
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ehdr.e_phentsize = bswap_16(ehdr.e_phentsize);
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ehdr.e_phnum = bswap_16(ehdr.e_phnum);
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}
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buf_size = ehdr.e_phentsize * ehdr.e_phnum;
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buf = malloc(buf_size);
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if (buf == NULL)
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goto out;
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fseek(fp, ehdr.e_phoff, SEEK_SET);
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if (fread(buf, buf_size, 1, fp) != 1)
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goto out_free;
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for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) {
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void *tmp;
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long offset;
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if (need_swap) {
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phdr->p_type = bswap_32(phdr->p_type);
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phdr->p_offset = bswap_32(phdr->p_offset);
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phdr->p_filesz = bswap_32(phdr->p_filesz);
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}
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if (phdr->p_type != PT_NOTE)
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continue;
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buf_size = phdr->p_filesz;
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offset = phdr->p_offset;
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tmp = realloc(buf, buf_size);
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if (tmp == NULL)
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goto out_free;
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buf = tmp;
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fseek(fp, offset, SEEK_SET);
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if (fread(buf, buf_size, 1, fp) != 1)
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goto out_free;
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ret = read_build_id(buf, buf_size, bf, size, need_swap);
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if (ret == 0)
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ret = size;
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break;
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}
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} else {
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Elf64_Ehdr ehdr;
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Elf64_Phdr *phdr;
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if (fread(&ehdr, sizeof(ehdr), 1, fp) != 1)
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goto out;
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if (need_swap) {
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ehdr.e_phoff = bswap_64(ehdr.e_phoff);
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ehdr.e_phentsize = bswap_16(ehdr.e_phentsize);
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ehdr.e_phnum = bswap_16(ehdr.e_phnum);
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}
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buf_size = ehdr.e_phentsize * ehdr.e_phnum;
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buf = malloc(buf_size);
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if (buf == NULL)
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goto out;
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fseek(fp, ehdr.e_phoff, SEEK_SET);
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if (fread(buf, buf_size, 1, fp) != 1)
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goto out_free;
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for (i = 0, phdr = buf; i < ehdr.e_phnum; i++, phdr++) {
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void *tmp;
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long offset;
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if (need_swap) {
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phdr->p_type = bswap_32(phdr->p_type);
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phdr->p_offset = bswap_64(phdr->p_offset);
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phdr->p_filesz = bswap_64(phdr->p_filesz);
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}
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if (phdr->p_type != PT_NOTE)
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continue;
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buf_size = phdr->p_filesz;
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offset = phdr->p_offset;
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tmp = realloc(buf, buf_size);
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if (tmp == NULL)
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goto out_free;
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buf = tmp;
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fseek(fp, offset, SEEK_SET);
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if (fread(buf, buf_size, 1, fp) != 1)
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goto out_free;
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ret = read_build_id(buf, buf_size, bf, size, need_swap);
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if (ret == 0)
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ret = size;
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break;
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}
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}
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out_free:
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free(buf);
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out:
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fclose(fp);
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return ret;
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}
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int sysfs__read_build_id(const char *filename, void *build_id, size_t size)
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{
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int fd;
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int ret = -1;
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struct stat stbuf;
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size_t buf_size;
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void *buf;
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fd = open(filename, O_RDONLY);
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if (fd < 0)
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return -1;
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if (fstat(fd, &stbuf) < 0)
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goto out;
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buf_size = stbuf.st_size;
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buf = malloc(buf_size);
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if (buf == NULL)
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goto out;
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if (read(fd, buf, buf_size) != (ssize_t) buf_size)
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goto out_free;
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ret = read_build_id(buf, buf_size, build_id, size, false);
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out_free:
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free(buf);
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out:
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close(fd);
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return ret;
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}
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int symsrc__init(struct symsrc *ss, struct dso *dso, const char *name,
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enum dso_binary_type type)
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{
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int fd = open(name, O_RDONLY);
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if (fd < 0)
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goto out_errno;
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ss->name = strdup(name);
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if (!ss->name)
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goto out_close;
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ss->fd = fd;
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ss->type = type;
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return 0;
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out_close:
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close(fd);
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out_errno:
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dso->load_errno = errno;
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return -1;
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}
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bool symsrc__possibly_runtime(struct symsrc *ss __maybe_unused)
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{
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/* Assume all sym sources could be a runtime image. */
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return true;
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}
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bool symsrc__has_symtab(struct symsrc *ss __maybe_unused)
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{
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return false;
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}
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void symsrc__destroy(struct symsrc *ss)
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{
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zfree(&ss->name);
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close(ss->fd);
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}
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int dso__synthesize_plt_symbols(struct dso *dso __maybe_unused,
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struct symsrc *ss __maybe_unused)
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{
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return 0;
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}
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static int fd__is_64_bit(int fd)
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{
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u8 e_ident[EI_NIDENT];
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if (lseek(fd, 0, SEEK_SET))
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return -1;
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if (readn(fd, e_ident, sizeof(e_ident)) != sizeof(e_ident))
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return -1;
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if (memcmp(e_ident, ELFMAG, SELFMAG) ||
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e_ident[EI_VERSION] != EV_CURRENT)
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return -1;
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return e_ident[EI_CLASS] == ELFCLASS64;
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}
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enum dso_type dso__type_fd(int fd)
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{
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Elf64_Ehdr ehdr;
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int ret;
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ret = fd__is_64_bit(fd);
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if (ret < 0)
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return DSO__TYPE_UNKNOWN;
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if (ret)
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return DSO__TYPE_64BIT;
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if (readn(fd, &ehdr, sizeof(ehdr)) != sizeof(ehdr))
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return DSO__TYPE_UNKNOWN;
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if (ehdr.e_machine == EM_X86_64)
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return DSO__TYPE_X32BIT;
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return DSO__TYPE_32BIT;
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}
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int dso__load_sym(struct dso *dso, struct map *map __maybe_unused,
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struct symsrc *ss,
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struct symsrc *runtime_ss __maybe_unused,
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int kmodule __maybe_unused)
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{
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unsigned char build_id[BUILD_ID_SIZE];
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int ret;
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ret = fd__is_64_bit(ss->fd);
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if (ret >= 0)
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dso->is_64_bit = ret;
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if (filename__read_build_id(ss->name, build_id, BUILD_ID_SIZE) > 0) {
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dso__set_build_id(dso, build_id);
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}
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return 0;
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}
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int file__read_maps(int fd __maybe_unused, bool exe __maybe_unused,
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mapfn_t mapfn __maybe_unused, void *data __maybe_unused,
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bool *is_64_bit __maybe_unused)
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{
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return -1;
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}
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int kcore_extract__create(struct kcore_extract *kce __maybe_unused)
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{
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return -1;
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}
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void kcore_extract__delete(struct kcore_extract *kce __maybe_unused)
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{
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}
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int kcore_copy(const char *from_dir __maybe_unused,
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const char *to_dir __maybe_unused)
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{
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return -1;
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}
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void symbol__elf_init(void)
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{
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}
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char *dso__demangle_sym(struct dso *dso __maybe_unused,
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int kmodule __maybe_unused,
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const char *elf_name __maybe_unused)
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{
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return NULL;
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}
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