1 /* Get public symbol information. 2 Copyright (C) 2002, 2003, 2004, 2005, 2008 Red Hat, Inc. 3 This file is part of Red Hat elfutils. 4 Written by Ulrich Drepper <drepper (at) redhat.com>, 2002. 5 6 Red Hat elfutils is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by the 8 Free Software Foundation; version 2 of the License. 9 10 Red Hat elfutils is distributed in the hope that it will be useful, but 11 WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 General Public License for more details. 14 15 You should have received a copy of the GNU General Public License along 16 with Red Hat elfutils; if not, write to the Free Software Foundation, 17 Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301 USA. 18 19 In addition, as a special exception, Red Hat, Inc. gives You the 20 additional right to link the code of Red Hat elfutils with code licensed 21 under any Open Source Initiative certified open source license 22 (http://www.opensource.org/licenses/index.php) which requires the 23 distribution of source code with any binary distribution and to 24 distribute linked combinations of the two. Non-GPL Code permitted under 25 this exception must only link to the code of Red Hat elfutils through 26 those well defined interfaces identified in the file named EXCEPTION 27 found in the source code files (the "Approved Interfaces"). The files 28 of Non-GPL Code may instantiate templates or use macros or inline 29 functions from the Approved Interfaces without causing the resulting 30 work to be covered by the GNU General Public License. Only Red Hat, 31 Inc. may make changes or additions to the list of Approved Interfaces. 32 Red Hat's grant of this exception is conditioned upon your not adding 33 any new exceptions. If you wish to add a new Approved Interface or 34 exception, please contact Red Hat. You must obey the GNU General Public 35 License in all respects for all of the Red Hat elfutils code and other 36 code used in conjunction with Red Hat elfutils except the Non-GPL Code 37 covered by this exception. If you modify this file, you may extend this 38 exception to your version of the file, but you are not obligated to do 39 so. If you do not wish to provide this exception without modification, 40 you must delete this exception statement from your version and license 41 this file solely under the GPL without exception. 42 43 Red Hat elfutils is an included package of the Open Invention Network. 44 An included package of the Open Invention Network is a package for which 45 Open Invention Network licensees cross-license their patents. No patent 46 license is granted, either expressly or impliedly, by designation as an 47 included package. Should you wish to participate in the Open Invention 48 Network licensing program, please visit www.openinventionnetwork.com 49 <http://www.openinventionnetwork.com>. */ 50 51 #ifdef HAVE_CONFIG_H 52 # include <config.h> 53 #endif 54 55 #include <assert.h> 56 #include <stdlib.h> 57 #include <string.h> 58 #include <sys/param.h> 59 60 #include <libdwP.h> 61 #include <dwarf.h> 62 63 /* ANDROID_CHANGE_BEGIN */ 64 #include <AndroidFixup.h> 65 /* ANDROID_CHANGE_END */ 66 67 static int 68 get_offsets (Dwarf *dbg) 69 { 70 size_t allocated = 0; 71 size_t cnt = 0; 72 struct pubnames_s *mem = NULL; 73 const size_t entsize = sizeof (struct pubnames_s); 74 unsigned char *const startp = dbg->sectiondata[IDX_debug_pubnames]->d_buf; 75 unsigned char *readp = startp; 76 unsigned char *endp = readp + dbg->sectiondata[IDX_debug_pubnames]->d_size; 77 78 while (readp + 14 < endp) 79 { 80 /* If necessary, allocate more entries. */ 81 if (cnt >= allocated) 82 { 83 allocated = MAX (10, 2 * allocated); 84 struct pubnames_s *newmem 85 = (struct pubnames_s *) realloc (mem, allocated * entsize); 86 if (newmem == NULL) 87 { 88 __libdw_seterrno (DWARF_E_NOMEM); 89 err_return: 90 free (mem); 91 return -1; 92 } 93 94 mem = newmem; 95 } 96 97 /* Read the set header. */ 98 int len_bytes = 4; 99 Dwarf_Off len = read_4ubyte_unaligned_inc (dbg, readp); 100 if (len == DWARF3_LENGTH_64_BIT) 101 { 102 len = read_8ubyte_unaligned_inc (dbg, readp); 103 len_bytes = 8; 104 } 105 else if (unlikely (len >= DWARF3_LENGTH_MIN_ESCAPE_CODE 106 && len <= DWARF3_LENGTH_MAX_ESCAPE_CODE)) 107 { 108 invalid_dwarf: 109 __libdw_seterrno (DWARF_E_INVALID_DWARF); 110 goto err_return; 111 } 112 113 /* Now we know the offset of the first offset/name pair. */ 114 mem[cnt].set_start = readp + 2 + 2 * len_bytes - startp; 115 mem[cnt].address_len = len_bytes; 116 if (mem[cnt].set_start >= dbg->sectiondata[IDX_debug_pubnames]->d_size) 117 /* Something wrong, the first entry is beyond the end of 118 the section. */ 119 break; 120 121 /* Read the version. It better be two for now. */ 122 uint16_t version = read_2ubyte_unaligned (dbg, readp); 123 if (unlikely (version != 2)) 124 { 125 __libdw_seterrno (DWARF_E_INVALID_VERSION); 126 goto err_return; 127 } 128 129 /* Get the CU offset. */ 130 if (len_bytes == 4) 131 mem[cnt].cu_offset = read_4ubyte_unaligned (dbg, readp + 2); 132 else 133 mem[cnt].cu_offset = read_8ubyte_unaligned (dbg, readp + 2); 134 135 /* Determine the size of the CU header. */ 136 if (unlikely (dbg->sectiondata[IDX_debug_info] == NULL 137 || dbg->sectiondata[IDX_debug_info]->d_buf == NULL 138 || (mem[cnt].cu_offset + 3 139 >= dbg->sectiondata[IDX_debug_info]->d_size))) 140 goto invalid_dwarf; 141 142 unsigned char *infop 143 = ((unsigned char *) dbg->sectiondata[IDX_debug_info]->d_buf 144 + mem[cnt].cu_offset); 145 if (read_4ubyte_unaligned_noncvt (infop) == DWARF3_LENGTH_64_BIT) 146 mem[cnt].cu_header_size = 23; 147 else 148 mem[cnt].cu_header_size = 11; 149 150 ++cnt; 151 152 /* Advance to the next set. */ 153 readp += len; 154 } 155 156 if (mem == NULL) 157 { 158 __libdw_seterrno (DWARF_E_NO_ENTRY); 159 return -1; 160 } 161 162 dbg->pubnames_sets = (struct pubnames_s *) realloc (mem, cnt * entsize); 163 dbg->pubnames_nsets = cnt; 164 165 return 0; 166 } 167 168 169 ptrdiff_t 170 dwarf_getpubnames (dbg, callback, arg, offset) 171 Dwarf *dbg; 172 int (*callback) (Dwarf *, Dwarf_Global *, void *); 173 void *arg; 174 ptrdiff_t offset; 175 { 176 if (dbg == NULL) 177 return -1l; 178 179 if (unlikely (offset < 0)) 180 { 181 __libdw_seterrno (DWARF_E_INVALID_OFFSET); 182 return -1l; 183 } 184 185 /* Make sure it is a valid offset. */ 186 if (unlikely (dbg->sectiondata[IDX_debug_pubnames] == NULL 187 || ((size_t) offset 188 >= dbg->sectiondata[IDX_debug_pubnames]->d_size))) 189 /* No (more) entry. */ 190 return 0; 191 192 /* If necessary read the set information. */ 193 if (dbg->pubnames_nsets == 0 && unlikely (get_offsets (dbg) != 0)) 194 return -1l; 195 196 /* Find the place where to start. */ 197 size_t cnt; 198 if (offset == 0) 199 { 200 cnt = 0; 201 offset = dbg->pubnames_sets[0].set_start; 202 } 203 else 204 { 205 for (cnt = 0; cnt + 1 < dbg->pubnames_nsets; ++cnt) 206 if ((Dwarf_Off) offset >= dbg->pubnames_sets[cnt].set_start) 207 { 208 assert ((Dwarf_Off) offset 209 < dbg->pubnames_sets[cnt + 1].set_start); 210 break; 211 } 212 assert (cnt + 1 < dbg->pubnames_nsets); 213 } 214 215 unsigned char *startp 216 = (unsigned char *) dbg->sectiondata[IDX_debug_pubnames]->d_buf; 217 unsigned char *readp = startp + offset; 218 while (1) 219 { 220 Dwarf_Global gl; 221 222 gl.cu_offset = (dbg->pubnames_sets[cnt].cu_offset 223 + dbg->pubnames_sets[cnt].cu_header_size); 224 225 while (1) 226 { 227 /* READP points to the next offset/name pair. */ 228 if (dbg->pubnames_sets[cnt].address_len == 4) 229 gl.die_offset = read_4ubyte_unaligned_inc (dbg, readp); 230 else 231 gl.die_offset = read_8ubyte_unaligned_inc (dbg, readp); 232 233 /* If the offset is zero we reached the end of the set. */ 234 if (gl.die_offset == 0) 235 break; 236 237 /* Add the CU offset. */ 238 gl.die_offset += dbg->pubnames_sets[cnt].cu_offset; 239 240 gl.name = (char *) readp; 241 readp = (unsigned char *) rawmemchr (gl.name, '\0') + 1; 242 243 /* We found name and DIE offset. Report it. */ 244 if (callback (dbg, &gl, arg) != DWARF_CB_OK) 245 { 246 /* The user wants us to stop. Return the offset of the 247 next entry. */ 248 return readp - startp; 249 } 250 } 251 252 if (++cnt == dbg->pubnames_nsets) 253 /* This was the last set. */ 254 break; 255 256 startp = (unsigned char *) dbg->sectiondata[IDX_debug_pubnames]->d_buf; 257 readp = startp + dbg->pubnames_sets[cnt].set_start; 258 } 259 260 /* We are done. No more entries. */ 261 return 0; 262 } 263
