97 lines
3.1 KiB
C
97 lines
3.1 KiB
C
/* $NetBSD: lookup_elf32.c,v 1.3 2010/02/11 21:28:16 martin Exp $ */
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/*-
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* Copyright (c) 2010 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Martin Husemann.
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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 NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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/* If not included by lookup_elf64.c, ELFSIZE won't be defined. */
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#ifndef ELFSIZE
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#define ELFSIZE 32
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#endif
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#include <lib/libkern/libkern.h>
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#include <sys/param.h>
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#include <sys/exec_elf.h>
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#if ((ELFSIZE == 32) && defined(BOOT_ELF32)) || \
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((ELFSIZE == 64) && defined(BOOT_ELF64))
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void * ELFNAMEEND(lookup_symbol)(const char *, void *, void *);
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void *
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ELFNAMEEND(lookup_symbol)(const char *symname, void *sstab, void *estab)
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{
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Elf_Ehdr *elf;
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Elf_Shdr *shp;
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Elf_Sym *symtab_start, *symtab_end, *sp;
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char *strtab_start, *strtab_end;
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int i, j;
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elf = sstab;
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if (elf->e_shoff == 0)
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return NULL;
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switch (elf->e_machine) {
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ELFDEFNNAME(MACHDEP_ID_CASES)
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default:
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return NULL;
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}
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symtab_start = symtab_end = NULL;
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strtab_start = strtab_end = NULL;
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shp = (Elf_Shdr *)((char *)sstab + elf->e_shoff);
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for (i = 0; i < elf->e_shnum; i++) {
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if (shp[i].sh_type != SHT_SYMTAB)
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continue;
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if (shp[i].sh_offset == 0)
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continue;
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symtab_start = (Elf_Sym*)((char*)sstab + shp[i].sh_offset);
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symtab_end = (Elf_Sym*)((char*)sstab + shp[i].sh_offset
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+ shp[i].sh_size);
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j = shp[i].sh_link;
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if (shp[j].sh_offset == 0)
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continue;
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strtab_start = (char*)sstab + shp[j].sh_offset;
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strtab_end = (char*)sstab + shp[j].sh_offset + shp[j].sh_size;
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break;
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}
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if (!symtab_start || !strtab_start)
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return NULL;
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for (sp = symtab_start; sp < symtab_end; sp++)
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if (sp->st_name != 0 &&
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strcmp(strtab_start + sp->st_name, symname) == 0)
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return (void*)(uintptr_t)sp->st_value;
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return NULL;
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}
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#endif /* (ELFSIZE == 32 && BOOT_ELF32) || (ELFSIZE == 64 && BOOT_ELF64) */
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