1164190Sjkoshy/*- 2164190Sjkoshy * Copyright (c) 2006 Joseph Koshy 3164190Sjkoshy * All rights reserved. 4164190Sjkoshy * 5164190Sjkoshy * Redistribution and use in source and binary forms, with or without 6164190Sjkoshy * modification, are permitted provided that the following conditions 7164190Sjkoshy * are met: 8164190Sjkoshy * 1. Redistributions of source code must retain the above copyright 9164190Sjkoshy * notice, this list of conditions and the following disclaimer. 10164190Sjkoshy * 2. Redistributions in binary form must reproduce the above copyright 11164190Sjkoshy * notice, this list of conditions and the following disclaimer in the 12164190Sjkoshy * documentation and/or other materials provided with the distribution. 13164190Sjkoshy * 14164190Sjkoshy * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15164190Sjkoshy * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16164190Sjkoshy * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17164190Sjkoshy * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18164190Sjkoshy * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19164190Sjkoshy * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20164190Sjkoshy * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21164190Sjkoshy * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22164190Sjkoshy * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23164190Sjkoshy * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24164190Sjkoshy * SUCH DAMAGE. 25164190Sjkoshy */ 26164190Sjkoshy 27164190Sjkoshy#include <sys/cdefs.h> 28164190Sjkoshy__FBSDID("$FreeBSD$"); 29164190Sjkoshy 30164190Sjkoshy#include <sys/limits.h> 31164190Sjkoshy 32164190Sjkoshy#include <assert.h> 33164190Sjkoshy#include <gelf.h> 34164190Sjkoshy 35164190Sjkoshy#include "_libelf.h" 36164190Sjkoshy 37164190SjkoshyGElf_Dyn * 38164190Sjkoshygelf_getdyn(Elf_Data *d, int ndx, GElf_Dyn *dst) 39164190Sjkoshy{ 40164190Sjkoshy int ec; 41164190Sjkoshy Elf *e; 42164190Sjkoshy Elf_Scn *scn; 43164190Sjkoshy Elf32_Dyn *dyn32; 44164190Sjkoshy Elf64_Dyn *dyn64; 45164190Sjkoshy size_t msz; 46164190Sjkoshy uint32_t sh_type; 47164190Sjkoshy 48164190Sjkoshy if (d == NULL || ndx < 0 || dst == NULL || 49164190Sjkoshy (scn = d->d_scn) == NULL || 50164190Sjkoshy (e = scn->s_elf) == NULL) { 51164190Sjkoshy LIBELF_SET_ERROR(ARGUMENT, 0); 52164190Sjkoshy return (NULL); 53164190Sjkoshy } 54164190Sjkoshy 55164190Sjkoshy ec = e->e_class; 56164190Sjkoshy assert(ec == ELFCLASS32 || ec == ELFCLASS64); 57164190Sjkoshy 58164190Sjkoshy if (ec == ELFCLASS32) 59164190Sjkoshy sh_type = scn->s_shdr.s_shdr32.sh_type; 60164190Sjkoshy else 61164190Sjkoshy sh_type = scn->s_shdr.s_shdr64.sh_type; 62164190Sjkoshy 63164190Sjkoshy if (_libelf_xlate_shtype(sh_type) != ELF_T_DYN) { 64164190Sjkoshy LIBELF_SET_ERROR(ARGUMENT, 0); 65164190Sjkoshy return (NULL); 66164190Sjkoshy } 67164190Sjkoshy 68164190Sjkoshy msz = _libelf_msize(ELF_T_DYN, ec, e->e_version); 69164190Sjkoshy 70164190Sjkoshy assert(msz > 0); 71164190Sjkoshy 72164190Sjkoshy if (msz * ndx >= d->d_size) { 73164190Sjkoshy LIBELF_SET_ERROR(ARGUMENT, 0); 74164190Sjkoshy return (NULL); 75164190Sjkoshy } 76164190Sjkoshy 77164190Sjkoshy if (ec == ELFCLASS32) { 78164190Sjkoshy dyn32 = (Elf32_Dyn *) d->d_buf + ndx; 79164190Sjkoshy 80164190Sjkoshy dst->d_tag = dyn32->d_tag; 81164190Sjkoshy dst->d_un.d_val = (Elf64_Xword) dyn32->d_un.d_val; 82164190Sjkoshy 83164190Sjkoshy } else { 84164190Sjkoshy 85164190Sjkoshy dyn64 = (Elf64_Dyn *) d->d_buf + ndx; 86164190Sjkoshy 87164190Sjkoshy *dst = *dyn64; 88164190Sjkoshy } 89164190Sjkoshy 90164190Sjkoshy return (dst); 91164190Sjkoshy} 92164190Sjkoshy 93164190Sjkoshyint 94164190Sjkoshygelf_update_dyn(Elf_Data *d, int ndx, GElf_Dyn *ds) 95164190Sjkoshy{ 96164190Sjkoshy int ec; 97164190Sjkoshy Elf *e; 98164190Sjkoshy Elf_Scn *scn; 99164190Sjkoshy Elf32_Dyn *dyn32; 100164190Sjkoshy Elf64_Dyn *dyn64; 101164190Sjkoshy size_t msz; 102164190Sjkoshy uint32_t sh_type; 103164190Sjkoshy 104164190Sjkoshy if (d == NULL || ndx < 0 || ds == NULL || 105164190Sjkoshy (scn = d->d_scn) == NULL || 106164190Sjkoshy (e = scn->s_elf) == NULL) { 107164190Sjkoshy LIBELF_SET_ERROR(ARGUMENT, 0); 108164190Sjkoshy return (0); 109164190Sjkoshy } 110164190Sjkoshy 111164190Sjkoshy ec = e->e_class; 112164190Sjkoshy assert(ec == ELFCLASS32 || ec == ELFCLASS64); 113164190Sjkoshy 114164190Sjkoshy if (ec == ELFCLASS32) 115164190Sjkoshy sh_type = scn->s_shdr.s_shdr32.sh_type; 116164190Sjkoshy else 117164190Sjkoshy sh_type = scn->s_shdr.s_shdr64.sh_type; 118164190Sjkoshy 119164190Sjkoshy if (_libelf_xlate_shtype(sh_type) != ELF_T_DYN) { 120164190Sjkoshy LIBELF_SET_ERROR(ARGUMENT, 0); 121164190Sjkoshy return (0); 122164190Sjkoshy } 123164190Sjkoshy 124164190Sjkoshy msz = _libelf_msize(ELF_T_DYN, ec, e->e_version); 125164190Sjkoshy assert(msz > 0); 126164190Sjkoshy 127164190Sjkoshy if (msz * ndx >= d->d_size) { 128164190Sjkoshy LIBELF_SET_ERROR(ARGUMENT, 0); 129164190Sjkoshy return (0); 130164190Sjkoshy } 131164190Sjkoshy 132164190Sjkoshy if (ec == ELFCLASS32) { 133164190Sjkoshy dyn32 = (Elf32_Dyn *) d->d_buf + ndx; 134164190Sjkoshy 135164190Sjkoshy LIBELF_COPY_S32(dyn32, ds, d_tag); 136164190Sjkoshy LIBELF_COPY_U32(dyn32, ds, d_un.d_val); 137164190Sjkoshy } else { 138164190Sjkoshy dyn64 = (Elf64_Dyn *) d->d_buf + ndx; 139164190Sjkoshy 140164190Sjkoshy *dyn64 = *ds; 141164190Sjkoshy } 142164190Sjkoshy 143164190Sjkoshy return (1); 144164190Sjkoshy} 145