1 /* $NetBSD: gelf_shdr.c,v 1.2 2014/03/09 16:58:04 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2006,2008 Joseph Koshy 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #if HAVE_NBTOOL_CONFIG_H 30 # include "nbtool_config.h" 31 #endif 32 33 #include <sys/cdefs.h> 34 35 #include <assert.h> 36 #include <gelf.h> 37 #include <libelf.h> 38 #include <limits.h> 39 40 #include "_libelf.h" 41 42 __RCSID("$NetBSD: gelf_shdr.c,v 1.2 2014/03/09 16:58:04 christos Exp $"); 43 ELFTC_VCSID("Id: gelf_shdr.c 2268 2011-12-03 17:05:11Z jkoshy "); 44 45 Elf32_Shdr * 46 elf32_getshdr(Elf_Scn *s) 47 { 48 return (_libelf_getshdr(s, ELFCLASS32)); 49 } 50 51 Elf64_Shdr * 52 elf64_getshdr(Elf_Scn *s) 53 { 54 return (_libelf_getshdr(s, ELFCLASS64)); 55 } 56 57 GElf_Shdr * 58 gelf_getshdr(Elf_Scn *s, GElf_Shdr *d) 59 { 60 int ec; 61 void *sh; 62 Elf32_Shdr *sh32; 63 Elf64_Shdr *sh64; 64 65 if (d == NULL) { 66 LIBELF_SET_ERROR(ARGUMENT, 0); 67 return (NULL); 68 } 69 70 if ((sh = _libelf_getshdr(s, ELFCLASSNONE)) == NULL) 71 return (NULL); 72 73 ec = s->s_elf->e_class; 74 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 75 76 if (ec == ELFCLASS32) { 77 sh32 = (Elf32_Shdr *) sh; 78 79 d->sh_name = sh32->sh_name; 80 d->sh_type = sh32->sh_type; 81 d->sh_flags = (Elf64_Xword) sh32->sh_flags; 82 d->sh_addr = (Elf64_Addr) sh32->sh_addr; 83 d->sh_offset = (Elf64_Off) sh32->sh_offset; 84 d->sh_size = (Elf64_Xword) sh32->sh_size; 85 d->sh_link = sh32->sh_link; 86 d->sh_info = sh32->sh_info; 87 d->sh_addralign = (Elf64_Xword) sh32->sh_addralign; 88 d->sh_entsize = (Elf64_Xword) sh32->sh_entsize; 89 } else { 90 sh64 = (Elf64_Shdr *) sh; 91 *d = *sh64; 92 } 93 94 return (d); 95 } 96 97 int 98 gelf_update_shdr(Elf_Scn *scn, GElf_Shdr *s) 99 { 100 int ec; 101 Elf *e; 102 Elf32_Shdr *sh32; 103 104 105 if (s == NULL || scn == NULL || (e = scn->s_elf) == NULL || 106 e->e_kind != ELF_K_ELF || 107 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) { 108 LIBELF_SET_ERROR(ARGUMENT, 0); 109 return (0); 110 } 111 112 if (e->e_cmd == ELF_C_READ) { 113 LIBELF_SET_ERROR(MODE, 0); 114 return (0); 115 } 116 117 (void) elf_flagscn(scn, ELF_C_SET, ELF_F_DIRTY); 118 119 if (ec == ELFCLASS64) { 120 scn->s_shdr.s_shdr64 = *s; 121 return (1); 122 } 123 124 sh32 = &scn->s_shdr.s_shdr32; 125 126 sh32->sh_name = s->sh_name; 127 sh32->sh_type = s->sh_type; 128 LIBELF_COPY_U32(sh32, s, sh_flags); 129 LIBELF_COPY_U32(sh32, s, sh_addr); 130 LIBELF_COPY_U32(sh32, s, sh_offset); 131 LIBELF_COPY_U32(sh32, s, sh_size); 132 sh32->sh_link = s->sh_link; 133 sh32->sh_info = s->sh_info; 134 LIBELF_COPY_U32(sh32, s, sh_addralign); 135 LIBELF_COPY_U32(sh32, s, sh_entsize); 136 137 return (1); 138 } 139