153 lines
3.7 KiB
C
153 lines
3.7 KiB
C
/* $NetBSD: sym.c,v 1.2 2010/11/24 13:17:56 christos Exp $ */
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/*-
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* Copyright (c) 2010 YAMAMOTO Takashi,
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__RCSID("$NetBSD: sym.c,v 1.2 2010/11/24 13:17:56 christos Exp $");
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#endif /* not lint */
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#include <assert.h>
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#include <err.h>
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#include <fcntl.h>
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#include <gelf.h>
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#include <inttypes.h>
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#include <libelf.h>
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#include <stdlib.h>
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#include <string.h>
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#include <util.h>
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#include "sym.h"
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struct sym {
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char *name;
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uint64_t value;
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uint64_t size;
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};
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static struct sym **syms = NULL;
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static size_t nsyms = 0;
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static int
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compare_value(const void *p1, const void *p2)
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{
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const struct sym *s1 = *(const struct sym * const *)p1;
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const struct sym *s2 = *(const struct sym * const *)p2;
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if (s1->value > s2->value) {
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return -1;
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} else if (s1->value < s2->value) {
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return 1;
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}
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return 0;
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}
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void
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ksymload(const char *ksyms)
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{
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Elf *e;
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Elf_Scn *s;
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GElf_Shdr sh_store;
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GElf_Shdr *sh;
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Elf_Data *d;
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int fd;
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size_t size, i;
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fd = open(ksyms, O_RDONLY);
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if (fd == -1) {
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err(EXIT_FAILURE, "open");
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}
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if (elf_version(EV_CURRENT) == EV_NONE) {
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goto elffail;
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}
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e = elf_begin(fd, ELF_C_READ, NULL);
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if (e == NULL) {
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goto elffail;
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}
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for (s = elf_nextscn(e, NULL); s != NULL; s = elf_nextscn(e, s)) {
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sh = gelf_getshdr(s, &sh_store);
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if (sh == NULL) {
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goto elffail;
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}
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if (sh->sh_type == SHT_SYMTAB) {
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break;
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}
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}
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if (s == NULL) {
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errx(EXIT_FAILURE, "no symtab");
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}
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d = elf_getdata(s, NULL);
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if (d == NULL) {
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goto elffail;
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}
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assert(sh->sh_size == d->d_size);
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size = sh->sh_size / sh->sh_entsize;
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for (i = 1; i < size; i++) {
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GElf_Sym st_store;
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GElf_Sym *st;
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struct sym *sym;
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st = gelf_getsym(d, (int)i, &st_store);
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if (st == NULL) {
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goto elffail;
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}
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if (ELF_ST_TYPE(st->st_info) != STT_FUNC) {
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continue;
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}
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sym = emalloc(sizeof(*sym));
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sym->name = estrdup(elf_strptr(e, sh->sh_link, st->st_name));
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sym->value = (uint64_t)st->st_value;
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sym->size = st->st_size;
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nsyms++;
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syms = erealloc(syms, sizeof(*syms) * nsyms);
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syms[nsyms - 1] = sym;
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}
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qsort(syms, nsyms, sizeof(*syms), compare_value);
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return;
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elffail:
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errx(EXIT_FAILURE, "libelf: %s", elf_errmsg(elf_errno()));
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}
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const char *
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ksymlookup(uint64_t value, uint64_t *offset)
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{
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size_t i;
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for (i = 0; i < nsyms; i++) {
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const struct sym *sym = syms[i];
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if (sym->value <= value) {
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*offset = value - sym->value;
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return sym->name;
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}
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if (sym->size != 0 && sym->value + sym->size < value) {
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break;
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}
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}
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return NULL;
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}
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