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@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
64 static int
get_offsets(Dwarf * dbg)65 get_offsets (Dwarf *dbg)
66 {
67 size_t allocated = 0;
68 size_t cnt = 0;
69 struct pubnames_s *mem = NULL;
70 const size_t entsize = sizeof (struct pubnames_s);
71 unsigned char *const startp = dbg->sectiondata[IDX_debug_pubnames]->d_buf;
72 unsigned char *readp = startp;
73 unsigned char *endp = readp + dbg->sectiondata[IDX_debug_pubnames]->d_size;
74
75 while (readp + 14 < endp)
76 {
77 /* If necessary, allocate more entries. */
78 if (cnt >= allocated)
79 {
80 allocated = MAX (10, 2 * allocated);
81 struct pubnames_s *newmem
82 = (struct pubnames_s *) realloc (mem, allocated * entsize);
83 if (newmem == NULL)
84 {
85 __libdw_seterrno (DWARF_E_NOMEM);
86 err_return:
87 free (mem);
88 return -1;
89 }
90
91 mem = newmem;
92 }
93
94 /* Read the set header. */
95 int len_bytes = 4;
96 Dwarf_Off len = read_4ubyte_unaligned_inc (dbg, readp);
97 if (len == DWARF3_LENGTH_64_BIT)
98 {
99 len = read_8ubyte_unaligned_inc (dbg, readp);
100 len_bytes = 8;
101 }
102 else if (unlikely (len >= DWARF3_LENGTH_MIN_ESCAPE_CODE
103 && len <= DWARF3_LENGTH_MAX_ESCAPE_CODE))
104 {
105 __libdw_seterrno (DWARF_E_INVALID_DWARF);
106 goto err_return;
107 }
108
109 /* Now we know the offset of the first offset/name pair. */
110 mem[cnt].set_start = readp + 2 + 2 * len_bytes - startp;
111 mem[cnt].address_len = len_bytes;
112 if (mem[cnt].set_start >= dbg->sectiondata[IDX_debug_pubnames]->d_size)
113 /* Something wrong, the first entry is beyond the end of
114 the section. */
115 break;
116
117 /* Read the version. It better be two for now. */
118 uint16_t version = read_2ubyte_unaligned (dbg, readp);
119 if (unlikely (version != 2))
120 {
121 __libdw_seterrno (DWARF_E_INVALID_VERSION);
122 goto err_return;
123 }
124
125 /* Get the CU offset. */
126 if (__libdw_read_offset (dbg, IDX_debug_pubnames, readp + 2, len_bytes,
127 &mem[cnt].cu_offset, IDX_debug_info, 3))
128 /* Error has been already set in reader. */
129 goto err_return;
130
131 /* Determine the size of the CU header. */
132 unsigned char *infop
133 = ((unsigned char *) dbg->sectiondata[IDX_debug_info]->d_buf
134 + mem[cnt].cu_offset);
135 if (read_4ubyte_unaligned_noncvt (infop) == DWARF3_LENGTH_64_BIT)
136 mem[cnt].cu_header_size = 23;
137 else
138 mem[cnt].cu_header_size = 11;
139
140 ++cnt;
141
142 /* Advance to the next set. */
143 readp += len;
144 }
145
146 if (mem == NULL)
147 {
148 __libdw_seterrno (DWARF_E_NO_ENTRY);
149 return -1;
150 }
151
152 dbg->pubnames_sets = (struct pubnames_s *) realloc (mem, cnt * entsize);
153 dbg->pubnames_nsets = cnt;
154
155 return 0;
156 }
157
158
159 ptrdiff_t
dwarf_getpubnames(dbg,callback,arg,offset)160 dwarf_getpubnames (dbg, callback, arg, offset)
161 Dwarf *dbg;
162 int (*callback) (Dwarf *, Dwarf_Global *, void *);
163 void *arg;
164 ptrdiff_t offset;
165 {
166 if (dbg == NULL)
167 return -1l;
168
169 if (unlikely (offset < 0))
170 {
171 __libdw_seterrno (DWARF_E_INVALID_OFFSET);
172 return -1l;
173 }
174
175 /* Make sure it is a valid offset. */
176 if (unlikely (dbg->sectiondata[IDX_debug_pubnames] == NULL
177 || ((size_t) offset
178 >= dbg->sectiondata[IDX_debug_pubnames]->d_size)))
179 /* No (more) entry. */
180 return 0;
181
182 /* If necessary read the set information. */
183 if (dbg->pubnames_nsets == 0 && unlikely (get_offsets (dbg) != 0))
184 return -1l;
185
186 /* Find the place where to start. */
187 size_t cnt;
188 if (offset == 0)
189 {
190 cnt = 0;
191 offset = dbg->pubnames_sets[0].set_start;
192 }
193 else
194 {
195 for (cnt = 0; cnt + 1 < dbg->pubnames_nsets; ++cnt)
196 if ((Dwarf_Off) offset >= dbg->pubnames_sets[cnt].set_start)
197 {
198 assert ((Dwarf_Off) offset
199 < dbg->pubnames_sets[cnt + 1].set_start);
200 break;
201 }
202 assert (cnt + 1 < dbg->pubnames_nsets);
203 }
204
205 unsigned char *startp
206 = (unsigned char *) dbg->sectiondata[IDX_debug_pubnames]->d_buf;
207 unsigned char *readp = startp + offset;
208 while (1)
209 {
210 Dwarf_Global gl;
211
212 gl.cu_offset = (dbg->pubnames_sets[cnt].cu_offset
213 + dbg->pubnames_sets[cnt].cu_header_size);
214
215 while (1)
216 {
217 /* READP points to the next offset/name pair. */
218 if (dbg->pubnames_sets[cnt].address_len == 4)
219 gl.die_offset = read_4ubyte_unaligned_inc (dbg, readp);
220 else
221 gl.die_offset = read_8ubyte_unaligned_inc (dbg, readp);
222
223 /* If the offset is zero we reached the end of the set. */
224 if (gl.die_offset == 0)
225 break;
226
227 /* Add the CU offset. */
228 gl.die_offset += dbg->pubnames_sets[cnt].cu_offset;
229
230 gl.name = (char *) readp;
231 readp = (unsigned char *) rawmemchr (gl.name, '\0') + 1;
232
233 /* We found name and DIE offset. Report it. */
234 if (callback (dbg, &gl, arg) != DWARF_CB_OK)
235 {
236 /* The user wants us to stop. Return the offset of the
237 next entry. */
238 return readp - startp;
239 }
240 }
241
242 if (++cnt == dbg->pubnames_nsets)
243 /* This was the last set. */
244 break;
245
246 startp = (unsigned char *) dbg->sectiondata[IDX_debug_pubnames]->d_buf;
247 readp = startp + dbg->pubnames_sets[cnt].set_start;
248 }
249
250 /* We are done. No more entries. */
251 return 0;
252 }
253