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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
Remove the split of symbol tables for data (MAP__VARIABLE) and for functions (MAP__FUNCTION), its unneeded and there were various places doing two lookups to find a symbol, so simplify this. We still will consider only the symbols that matched the filters in place, i.e. see the (elf_(sec,sym)|symbol_type)__filter() routines in the patch, just so that we consider only the same symbols as before, to reduce the possibility of regressions. All the tests on 50-something build environments, in varios versions of lots of distros and cross build environments were performed without build regressions, as usual with all pull requests the other tests were also performed: 'perf test' and 'make -C tools/perf build-test'. Also this was done at a great granularity so that regressions can be bisected more easily. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-hiq0fy2rsleupnqqwuojo1ne@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
383 lines
7.2 KiB
C
383 lines
7.2 KiB
C
// 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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