gelf_cap.c revision 164190
13259Sdg/*- 23259Sdg * Copyright (c) 2006 Joseph Koshy 33259Sdg * All rights reserved. 43259Sdg * 53259Sdg * Redistribution and use in source and binary forms, with or without 63259Sdg * modification, are permitted provided that the following conditions 73259Sdg * are met: 83259Sdg * 1. Redistributions of source code must retain the above copyright 93259Sdg * notice, this list of conditions and the following disclaimer. 103259Sdg * 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__FBSDID("$FreeBSD: head/lib/libelf/gelf_cap.c 164190 2006-11-11 17:16:35Z jkoshy $"); 29 30#include <sys/limits.h> 31 32#include <assert.h> 33#include <gelf.h> 34 35#include "_libelf.h" 36 37GElf_Cap * 38gelf_getcap(Elf_Data *d, int ndx, GElf_Cap *dst) 39{ 40 int ec; 41 Elf *e; 42 Elf_Scn *scn; 43 Elf32_Cap *cap32; 44 Elf64_Cap *cap64; 45 size_t msz; 46 uint32_t sh_type; 47 48 if (d == NULL || ndx < 0 || dst == NULL || 49 (scn = d->d_scn) == NULL || 50 (e = scn->s_elf) == NULL) { 51 LIBELF_SET_ERROR(ARGUMENT, 0); 52 return (NULL); 53 } 54 55 ec = e->e_class; 56 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 57 58 if (ec == ELFCLASS32) 59 sh_type = scn->s_shdr.s_shdr32.sh_type; 60 else 61 sh_type = scn->s_shdr.s_shdr64.sh_type; 62 63 if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) { 64 LIBELF_SET_ERROR(ARGUMENT, 0); 65 return (NULL); 66 } 67 68 msz = _libelf_msize(ELF_T_CAP, ec, e->e_version); 69 70 assert(msz > 0); 71 72 if (msz * ndx >= d->d_size) { 73 LIBELF_SET_ERROR(ARGUMENT, 0); 74 return (NULL); 75 } 76 77 if (ec == ELFCLASS32) { 78 79 cap32 = (Elf32_Cap *) d->d_buf + ndx; 80 81 dst->c_tag = cap32->c_tag; 82 dst->c_un.c_val = (Elf64_Xword) cap32->c_un.c_val; 83 84 } else { 85 86 cap64 = (Elf64_Cap *) d->d_buf + ndx; 87 88 *dst = *cap64; 89 } 90 91 return (dst); 92} 93 94int 95gelf_update_cap(Elf_Data *d, int ndx, GElf_Cap *gc) 96{ 97 int ec; 98 Elf *e; 99 Elf_Scn *scn; 100 Elf32_Cap *cap32; 101 Elf64_Cap *cap64; 102 size_t msz; 103 uint32_t sh_type; 104 105 if (d == NULL || ndx < 0 || gc == NULL || 106 (scn = d->d_scn) == NULL || 107 (e = scn->s_elf) == NULL) { 108 LIBELF_SET_ERROR(ARGUMENT, 0); 109 return (0); 110 } 111 112 ec = e->e_class; 113 assert(ec == ELFCLASS32 || ec == ELFCLASS64); 114 115 if (ec == ELFCLASS32) 116 sh_type = scn->s_shdr.s_shdr32.sh_type; 117 else 118 sh_type = scn->s_shdr.s_shdr64.sh_type; 119 120 if (_libelf_xlate_shtype(sh_type) != ELF_T_CAP) { 121 LIBELF_SET_ERROR(ARGUMENT, 0); 122 return (0); 123 } 124 125 msz = _libelf_msize(ELF_T_CAP, ec, e->e_version); 126 assert(msz > 0); 127 128 if (msz * ndx >= d->d_size) { 129 LIBELF_SET_ERROR(ARGUMENT, 0); 130 return (0); 131 } 132 133 if (ec == ELFCLASS32) { 134 cap32 = (Elf32_Cap *) d->d_buf + ndx; 135 136 LIBELF_COPY_U32(cap32, gc, c_tag); 137 LIBELF_COPY_U32(cap32, gc, c_un.c_val); 138 } else { 139 cap64 = (Elf64_Cap *) d->d_buf + ndx; 140 141 *cap64 = *gc; 142 } 143 144 return (1); 145} 146