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 <assert.h> 28 #include <gelf.h> 29 #include <libelf.h> 30 #include <limits.h> 31 #include <stdint.h> 32 33 #include "_libelf.h" 34 35 ELFTC_VCSID("$Id: gelf_shdr.c 3177 2015-03-30 18:19:41Z emaste $"); 36 37 Elf32_Shdr * 38 elf32_getshdr(Elf_Scn *s) 39 { 40 return (_libelf_getshdr(s, ELFCLASS32)); 41 } 42 43 Elf64_Shdr * 44 elf64_getshdr(Elf_Scn *s) 45 { 46 return (_libelf_getshdr(s, ELFCLASS64)); 47 } 48 49 GElf_Shdr * 50 gelf_getshdr(Elf_Scn *s, GElf_Shdr *d) 51 { 52 int ec; 53 void *sh; 54 Elf32_Shdr *sh32; 55 Elf64_Shdr *sh64; 56 57 if (d == NULL) { 58 LIBELF_SET_ERROR(ARGUMENT, 0); 59 return (NULL); 60 } 61 62 if ((sh = _libelf_getshdr(s, ELFCLASSNONE)) == NULL) 63 return (NULL); 64 65 ec = s->s_elf->e_class; 66 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 67 68 if (ec == ELFCLASS32) { 69 sh32 = (Elf32_Shdr *) sh; 70 71 d->sh_name = sh32->sh_name; 72 d->sh_type = sh32->sh_type; 73 d->sh_flags = (Elf64_Xword) sh32->sh_flags; 74 d->sh_addr = (Elf64_Addr) sh32->sh_addr; 75 d->sh_offset = (Elf64_Off) sh32->sh_offset; 76 d->sh_size = (Elf64_Xword) sh32->sh_size; 77 d->sh_link = sh32->sh_link; 78 d->sh_info = sh32->sh_info; 79 d->sh_addralign = (Elf64_Xword) sh32->sh_addralign; 80 d->sh_entsize = (Elf64_Xword) sh32->sh_entsize; 81 } else { 82 sh64 = (Elf64_Shdr *) sh; 83 *d = *sh64; 84 } 85 86 return (d); 87 } 88 89 int 90 gelf_update_shdr(Elf_Scn *scn, GElf_Shdr *s) 91 { 92 int ec; 93 Elf *e; 94 Elf32_Shdr *sh32; 95 96 97 if (s == NULL || scn == NULL || (e = scn->s_elf) == NULL || 98 e->e_kind != ELF_K_ELF || 99 ((ec = e->e_class) != ELFCLASS32 && ec != ELFCLASS64)) { 100 LIBELF_SET_ERROR(ARGUMENT, 0); 101 return (0); 102 } 103 104 if (e->e_cmd == ELF_C_READ) { 105 LIBELF_SET_ERROR(MODE, 0); 106 return (0); 107 } 108 109 (void) elf_flagscn(scn, ELF_C_SET, ELF_F_DIRTY); 110 111 if (ec == ELFCLASS64) { 112 scn->s_shdr.s_shdr64 = *s; 113 return (1); 114 } 115 116 sh32 = &scn->s_shdr.s_shdr32; 117 118 sh32->sh_name = s->sh_name; 119 sh32->sh_type = s->sh_type; 120 LIBELF_COPY_U32(sh32, s, sh_flags); 121 LIBELF_COPY_U32(sh32, s, sh_addr); 122 LIBELF_COPY_U32(sh32, s, sh_offset); 123 LIBELF_COPY_U32(sh32, s, sh_size); 124 sh32->sh_link = s->sh_link; 125 sh32->sh_info = s->sh_info; 126 LIBELF_COPY_U32(sh32, s, sh_addralign); 127 LIBELF_COPY_U32(sh32, s, sh_entsize); 128 129 return (1); 130 } 131