1 /* Return converted data from raw chunk of ELF file. 2 Copyright (C) 2007 Red Hat, Inc. 3 This file is part of Red Hat elfutils. 4 5 Red Hat elfutils is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by the 7 Free Software Foundation; version 2 of the License. 8 9 Red Hat elfutils is distributed in the hope that it will be useful, but 10 WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 12 General Public License for more details. 13 14 You should have received a copy of the GNU General Public License along 15 with Red Hat elfutils; if not, write to the Free Software Foundation, 16 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 17 18 In addition, as a special exception, Red Hat, Inc. gives You the 19 additional right to link the code of Red Hat elfutils with code licensed 20 under any Open Source Initiative certified open source license 21 (http://www.opensource.org/licenses/index.php) which requires the 22 distribution of source code with any binary distribution and to 23 distribute linked combinations of the two. Non-GPL Code permitted under 24 this exception must only link to the code of Red Hat elfutils through 25 those well defined interfaces identified in the file named EXCEPTION 26 found in the source code files (the "Approved Interfaces"). The files 27 of Non-GPL Code may instantiate templates or use macros or inline 28 functions from the Approved Interfaces without causing the resulting 29 work to be covered by the GNU General Public License. Only Red Hat, 30 Inc. may make changes or additions to the list of Approved Interfaces. 31 Red Hat's grant of this exception is conditioned upon your not adding 32 any new exceptions. If you wish to add a new Approved Interface or 33 exception, please contact Red Hat. You must obey the GNU General Public 34 License in all respects for all of the Red Hat elfutils code and other 35 code used in conjunction with Red Hat elfutils except the Non-GPL Code 36 covered by this exception. If you modify this file, you may extend this 37 exception to your version of the file, but you are not obligated to do 38 so. If you do not wish to provide this exception without modification, 39 you must delete this exception statement from your version and license 40 this file solely under the GPL without exception. 41 42 Red Hat elfutils is an included package of the Open Invention Network. 43 An included package of the Open Invention Network is a package for which 44 Open Invention Network licensees cross-license their patents. No patent 45 license is granted, either expressly or impliedly, by designation as an 46 included package. Should you wish to participate in the Open Invention 47 Network licensing program, please visit www.openinventionnetwork.com 48 <http://www.openinventionnetwork.com>. */ 49 50 #ifdef HAVE_CONFIG_H 51 # include <config.h> 52 #endif 53 54 #include <assert.h> 55 #include <errno.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <unistd.h> 59 60 #include <system.h> 61 #include "libelfP.h" 62 #include "common.h" 63 64 Elf_Data * 65 elf_getdata_rawchunk (elf, offset, size, type) 66 Elf *elf; 67 /* ANDROID_CHANGE_BEGIN */ 68 #if 0 69 off64_t offset; 70 #else 71 off_t offset; 72 #endif 73 /* ANDROID_CHANGE_END */ 74 size_t size; 75 Elf_Type type; 76 { 77 if (unlikely (elf == NULL)) 78 return NULL; 79 80 if (unlikely (elf->kind != ELF_K_ELF)) 81 { 82 /* No valid descriptor. */ 83 __libelf_seterrno (ELF_E_INVALID_HANDLE); 84 return NULL; 85 } 86 87 /* ANDROID_CHANGE_BEGIN */ 88 #if 0 89 if (unlikely (size > elf->maximum_size 90 || (off64_t) (elf->maximum_size - size) < offset)) 91 #else 92 if (unlikely (size > elf->maximum_size 93 || (off_t) (elf->maximum_size - size) < offset)) 94 #endif 95 /* ANDROID_CHANGE_END */ 96 { 97 /* Invalid request. */ 98 __libelf_seterrno (ELF_E_INVALID_OP); 99 return NULL; 100 } 101 102 if (type >= ELF_T_NUM) 103 { 104 __libelf_seterrno (ELF_E_UNKNOWN_TYPE); 105 return NULL; 106 } 107 108 /* Get the raw bytes from the file. */ 109 void *rawchunk; 110 int flags = 0; 111 Elf_Data *result = NULL; 112 113 rwlock_rdlock (elf->lock); 114 115 /* If the file is mmap'ed we can use it directly. */ 116 if (elf->map_address != NULL) 117 rawchunk = elf->map_address + elf->start_offset + offset; 118 else 119 { 120 /* We allocate the memory and read the data from the file. */ 121 rawchunk = malloc (size); 122 if (rawchunk == NULL) 123 { 124 nomem: 125 __libelf_seterrno (ELF_E_NOMEM); 126 goto out; 127 } 128 129 /* Read the file content. */ 130 if (unlikely ((size_t) pread_retry (elf->fildes, rawchunk, size, 131 elf->start_offset + offset) 132 != size)) 133 { 134 /* Something went wrong. */ 135 free (rawchunk); 136 __libelf_seterrno (ELF_E_READ_ERROR); 137 goto out; 138 } 139 140 flags = ELF_F_MALLOCED; 141 } 142 143 /* Copy and/or convert the data as needed for aligned native-order access. */ 144 size_t align = __libelf_type_align (elf->class, type); 145 void *buffer; 146 if (elf->state.elf32.ehdr->e_ident[EI_DATA] == MY_ELFDATA) 147 { 148 if (((uintptr_t) rawchunk & (align - 1)) == 0) 149 /* No need to copy, we can use the raw data. */ 150 buffer = rawchunk; 151 else 152 { 153 /* A malloc'd block is always sufficiently aligned. */ 154 assert (flags == 0); 155 156 buffer = malloc (size); 157 if (unlikely (buffer == NULL)) 158 goto nomem; 159 flags = ELF_F_MALLOCED; 160 161 /* The copy will be appropriately aligned for direct access. */ 162 memcpy (buffer, rawchunk, size); 163 } 164 } 165 else 166 { 167 if (flags) 168 buffer = rawchunk; 169 else 170 { 171 buffer = malloc (size); 172 if (unlikely (buffer == NULL)) 173 goto nomem; 174 flags = ELF_F_MALLOCED; 175 } 176 177 /* Call the conversion function. */ 178 (*__elf_xfctstom[LIBELF_EV_IDX][LIBELF_EV_IDX][elf->class - 1][type]) 179 (buffer, rawchunk, size, 0); 180 } 181 182 /* Allocate the dummy container to point at this buffer. */ 183 Elf_Data_Chunk *chunk = calloc (1, sizeof *chunk); 184 if (chunk == NULL) 185 { 186 if (flags) 187 free (buffer); 188 goto nomem; 189 } 190 191 chunk->dummy_scn.elf = elf; 192 chunk->dummy_scn.flags = flags; 193 chunk->data.s = &chunk->dummy_scn; 194 chunk->data.d.d_buf = buffer; 195 chunk->data.d.d_size = size; 196 chunk->data.d.d_type = type; 197 chunk->data.d.d_align = align; 198 chunk->data.d.d_version = __libelf_version; 199 200 rwlock_unlock (elf->lock); 201 rwlock_wrlock (elf->lock); 202 203 chunk->next = elf->state.elf.rawchunks; 204 elf->state.elf.rawchunks = chunk; 205 result = &chunk->data.d; 206 207 out: 208 rwlock_unlock (elf->lock); 209 return result; 210 } 211
