lookup_elf32.c revision 1.3.2.2
1 1.3.2.2 yamt /* $NetBSD: lookup_elf32.c,v 1.3.2.2 2010/03/11 15:04:22 yamt Exp $ */ 2 1.3.2.2 yamt 3 1.3.2.2 yamt /*- 4 1.3.2.2 yamt * Copyright (c) 2010 The NetBSD Foundation, Inc. 5 1.3.2.2 yamt * All rights reserved. 6 1.3.2.2 yamt * 7 1.3.2.2 yamt * This code is derived from software contributed to The NetBSD Foundation 8 1.3.2.2 yamt * by Martin Husemann. 9 1.3.2.2 yamt * 10 1.3.2.2 yamt * Redistribution and use in source and binary forms, with or without 11 1.3.2.2 yamt * modification, are permitted provided that the following conditions 12 1.3.2.2 yamt * are met: 13 1.3.2.2 yamt * 1. Redistributions of source code must retain the above copyright 14 1.3.2.2 yamt * notice, this list of conditions and the following disclaimer. 15 1.3.2.2 yamt * 2. Redistributions in binary form must reproduce the above copyright 16 1.3.2.2 yamt * notice, this list of conditions and the following disclaimer in the 17 1.3.2.2 yamt * documentation and/or other materials provided with the distribution. 18 1.3.2.2 yamt * 19 1.3.2.2 yamt * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.3.2.2 yamt * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.3.2.2 yamt * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.3.2.2 yamt * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.3.2.2 yamt * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.3.2.2 yamt * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.3.2.2 yamt * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.3.2.2 yamt * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.3.2.2 yamt * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.3.2.2 yamt * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.3.2.2 yamt * POSSIBILITY OF SUCH DAMAGE. 30 1.3.2.2 yamt */ 31 1.3.2.2 yamt 32 1.3.2.2 yamt /* If not included by lookup_elf64.c, ELFSIZE won't be defined. */ 33 1.3.2.2 yamt #ifndef ELFSIZE 34 1.3.2.2 yamt #define ELFSIZE 32 35 1.3.2.2 yamt #endif 36 1.3.2.2 yamt 37 1.3.2.2 yamt #include <lib/libkern/libkern.h> 38 1.3.2.2 yamt #include <sys/param.h> 39 1.3.2.2 yamt #include <sys/exec_elf.h> 40 1.3.2.2 yamt 41 1.3.2.2 yamt #if ((ELFSIZE == 32) && defined(BOOT_ELF32)) || \ 42 1.3.2.2 yamt ((ELFSIZE == 64) && defined(BOOT_ELF64)) 43 1.3.2.2 yamt 44 1.3.2.2 yamt void * ELFNAMEEND(lookup_symbol)(const char *, void *, void *); 45 1.3.2.2 yamt 46 1.3.2.2 yamt void * 47 1.3.2.2 yamt ELFNAMEEND(lookup_symbol)(const char *symname, void *sstab, void *estab) 48 1.3.2.2 yamt { 49 1.3.2.2 yamt Elf_Ehdr *elf; 50 1.3.2.2 yamt Elf_Shdr *shp; 51 1.3.2.2 yamt Elf_Sym *symtab_start, *symtab_end, *sp; 52 1.3.2.2 yamt char *strtab_start, *strtab_end; 53 1.3.2.2 yamt int i, j; 54 1.3.2.2 yamt 55 1.3.2.2 yamt elf = sstab; 56 1.3.2.2 yamt if (elf->e_shoff == 0) 57 1.3.2.2 yamt return NULL; 58 1.3.2.2 yamt 59 1.3.2.2 yamt switch (elf->e_machine) { 60 1.3.2.2 yamt ELFDEFNNAME(MACHDEP_ID_CASES) 61 1.3.2.2 yamt default: 62 1.3.2.2 yamt return NULL; 63 1.3.2.2 yamt } 64 1.3.2.2 yamt 65 1.3.2.2 yamt symtab_start = symtab_end = NULL; 66 1.3.2.2 yamt strtab_start = strtab_end = NULL; 67 1.3.2.2 yamt 68 1.3.2.2 yamt shp = (Elf_Shdr *)((char *)sstab + elf->e_shoff); 69 1.3.2.2 yamt for (i = 0; i < elf->e_shnum; i++) { 70 1.3.2.2 yamt if (shp[i].sh_type != SHT_SYMTAB) 71 1.3.2.2 yamt continue; 72 1.3.2.2 yamt if (shp[i].sh_offset == 0) 73 1.3.2.2 yamt continue; 74 1.3.2.2 yamt symtab_start = (Elf_Sym*)((char*)sstab + shp[i].sh_offset); 75 1.3.2.2 yamt symtab_end = (Elf_Sym*)((char*)sstab + shp[i].sh_offset 76 1.3.2.2 yamt + shp[i].sh_size); 77 1.3.2.2 yamt j = shp[i].sh_link; 78 1.3.2.2 yamt if (shp[j].sh_offset == 0) 79 1.3.2.2 yamt continue; 80 1.3.2.2 yamt strtab_start = (char*)sstab + shp[j].sh_offset; 81 1.3.2.2 yamt strtab_end = (char*)sstab + shp[j].sh_offset + shp[j].sh_size; 82 1.3.2.2 yamt break; 83 1.3.2.2 yamt } 84 1.3.2.2 yamt 85 1.3.2.2 yamt if (!symtab_start || !strtab_start) 86 1.3.2.2 yamt return NULL; 87 1.3.2.2 yamt 88 1.3.2.2 yamt for (sp = symtab_start; sp < symtab_end; sp++) 89 1.3.2.2 yamt if (sp->st_name != 0 && 90 1.3.2.2 yamt strcmp(strtab_start + sp->st_name, symname) == 0) 91 1.3.2.2 yamt return (void*)(uintptr_t)sp->st_value; 92 1.3.2.2 yamt 93 1.3.2.2 yamt return NULL; 94 1.3.2.2 yamt } 95 1.3.2.2 yamt 96 1.3.2.2 yamt #endif /* (ELFSIZE == 32 && BOOT_ELF32) || (ELFSIZE == 64 && BOOT_ELF64) */ 97
Indexes created Thu Oct 02 14:10:14 GMT 2025