15c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles)/* Get information from dynamic table at the given index. 25c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Copyright (C) 2000, 2001, 2002 Red Hat, Inc. 35c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) This file is part of Red Hat elfutils. 45c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Written by Ulrich Drepper <drepper@redhat.com>, 2000. 55c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 65c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Red Hat elfutils is free software; you can redistribute it and/or modify 75c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) it under the terms of the GNU General Public License as published by the 85c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Free Software Foundation; version 2 of the License. 95c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 105c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Red Hat elfutils is distributed in the hope that it will be useful, but 115c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) WITHOUT ANY WARRANTY; without even the implied warranty of 125c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 135c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) General Public License for more details. 145c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 155c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) You should have received a copy of the GNU General Public License along 165c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) with Red Hat elfutils; if not, write to the Free Software Foundation, 175c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 185c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 195c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) In addition, as a special exception, Red Hat, Inc. gives You the 205c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) additional right to link the code of Red Hat elfutils with code licensed 215c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) under any Open Source Initiative certified open source license 225c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) (http://www.opensource.org/licenses/index.php) which requires the 2302772c6a72f1ee0b226341a4f4439970c29fc861Ben Murdoch distribution of source code with any binary distribution and to 245c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) distribute linked combinations of the two. Non-GPL Code permitted under 255c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) this exception must only link to the code of Red Hat elfutils through 265c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) those well defined interfaces identified in the file named EXCEPTION 275c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) found in the source code files (the "Approved Interfaces"). The files 2853e740f4a82e17f3ae59772501622dc354e42336Torne (Richard Coles) of Non-GPL Code may instantiate templates or use macros or inline 295c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) functions from the Approved Interfaces without causing the resulting 3053e740f4a82e17f3ae59772501622dc354e42336Torne (Richard Coles) work to be covered by the GNU General Public License. Only Red Hat, 315c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Inc. may make changes or additions to the list of Approved Interfaces. 32c1847b1379d12d0e05df27436bf19a9b1bf12deaTorne (Richard Coles) Red Hat's grant of this exception is conditioned upon your not adding 335c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) any new exceptions. If you wish to add a new Approved Interface or 345c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) exception, please contact Red Hat. You must obey the GNU General Public 355c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) License in all respects for all of the Red Hat elfutils code and other 365c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) code used in conjunction with Red Hat elfutils except the Non-GPL Code 375c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) covered by this exception. If you modify this file, you may extend this 385c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) exception to your version of the file, but you are not obligated to do 395c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) so. If you do not wish to provide this exception without modification, 405c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) you must delete this exception statement from your version and license 415c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) this file solely under the GPL without exception. 425c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) 435c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Red Hat elfutils is an included package of the Open Invention Network. 445c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) An included package of the Open Invention Network is a package for which 455c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Open Invention Network licensees cross-license their patents. No patent 465c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) license is granted, either expressly or impliedly, by designation as an 475c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) included package. Should you wish to participate in the Open Invention 485c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) Network licensing program, please visit www.openinventionnetwork.com 495c87bf8b86a7c82ef50fb7a89697d8e02e2553beTorne (Richard Coles) <http://www.openinventionnetwork.com>. */ 50 51#ifdef HAVE_CONFIG_H 52# include <config.h> 53#endif 54 55#include <assert.h> 56#include <gelf.h> 57#include <string.h> 58 59#include "libelfP.h" 60 61 62GElf_Dyn * 63gelf_getdyn (data, ndx, dst) 64 Elf_Data *data; 65 int ndx; 66 GElf_Dyn *dst; 67{ 68 Elf_Data_Scn *data_scn = (Elf_Data_Scn *) data; 69 GElf_Dyn *result = NULL; 70 Elf *elf; 71 72 if (data_scn == NULL) 73 return NULL; 74 75 if (unlikely (data_scn->d.d_type != ELF_T_DYN)) 76 { 77 __libelf_seterrno (ELF_E_INVALID_HANDLE); 78 return NULL; 79 } 80 81 elf = data_scn->s->elf; 82 83 rwlock_rdlock (elf->lock); 84 85 /* This is the one place where we have to take advantage of the fact 86 that an `Elf_Data' pointer is also a pointer to `Elf_Data_Scn'. 87 The interface is broken so that it requires this hack. */ 88 if (elf->class == ELFCLASS32) 89 { 90 Elf32_Dyn *src; 91 92 /* Here it gets a bit more complicated. The format of the symbol 93 table entries has to be adopted. The user better has provided 94 a buffer where we can store the information. While copying the 95 data we are converting the format. */ 96 if (unlikely ((ndx + 1) * sizeof (Elf32_Dyn) > data_scn->d.d_size)) 97 { 98 __libelf_seterrno (ELF_E_INVALID_INDEX); 99 goto out; 100 } 101 102 src = &((Elf32_Dyn *) data_scn->d.d_buf)[ndx]; 103 104 /* This might look like a simple copy operation but it's 105 not. There are zero- and sign-extensions going on. */ 106 dst->d_tag = src->d_tag; 107 /* It OK to copy `d_val' since `d_ptr' has the same size. */ 108 dst->d_un.d_val = src->d_un.d_val; 109 } 110 else 111 { 112 /* If this is a 64 bit object it's easy. */ 113 assert (sizeof (GElf_Dyn) == sizeof (Elf64_Dyn)); 114 115 /* The data is already in the correct form. Just make sure the 116 index is OK. */ 117 if (unlikely ((ndx + 1) * sizeof (GElf_Dyn) > data_scn->d.d_size)) 118 { 119 __libelf_seterrno (ELF_E_INVALID_INDEX); 120 goto out; 121 } 122 123 *dst = ((GElf_Dyn *) data_scn->d.d_buf)[ndx]; 124 } 125 126 result = dst; 127 128 out: 129 rwlock_unlock (elf->lock); 130 131 return result; 132} 133