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