Line data Source code
1 : /* Return list address ranges.
2 : Copyright (C) 2000-2010, 2016, 2017 Red Hat, Inc.
3 : This file is part of elfutils.
4 : Written by Ulrich Drepper <drepper@redhat.com>, 2000.
5 :
6 : This file is free software; you can redistribute it and/or modify
7 : it under the terms of either
8 :
9 : * the GNU Lesser General Public License as published by the Free
10 : Software Foundation; either version 3 of the License, or (at
11 : your option) any later version
12 :
13 : or
14 :
15 : * the GNU General Public License as published by the Free
16 : Software Foundation; either version 2 of the License, or (at
17 : your option) any later version
18 :
19 : or both in parallel, as here.
20 :
21 : elfutils is distributed in the hope that it will be useful, but
22 : WITHOUT ANY WARRANTY; without even the implied warranty of
23 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 : General Public License for more details.
25 :
26 : You should have received copies of the GNU General Public License and
27 : the GNU Lesser General Public License along with this program. If
28 : not, see <http://www.gnu.org/licenses/>. */
29 :
30 : #ifdef HAVE_CONFIG_H
31 : # include <config.h>
32 : #endif
33 :
34 : #include <stdlib.h>
35 : #include <assert.h>
36 : #include "libdwP.h"
37 : #include <dwarf.h>
38 :
39 : struct arangelist
40 : {
41 : Dwarf_Arange arange;
42 : struct arangelist *next;
43 : };
44 :
45 : /* Compare by Dwarf_Arange.addr, given pointers into an array of pointeers. */
46 : static int
47 46 : compare_aranges (const void *a, const void *b)
48 : {
49 46 : struct arangelist *const *p1 = a, *const *p2 = b;
50 46 : struct arangelist *l1 = *p1, *l2 = *p2;
51 46 : if (l1->arange.addr != l2->arange.addr)
52 46 : return (l1->arange.addr < l2->arange.addr) ? -1 : 1;
53 : return 0;
54 : }
55 :
56 : int
57 77 : dwarf_getaranges (Dwarf *dbg, Dwarf_Aranges **aranges, size_t *naranges)
58 : {
59 77 : if (dbg == NULL)
60 : return -1;
61 :
62 77 : if (dbg->aranges != NULL)
63 : {
64 13 : *aranges = dbg->aranges;
65 13 : if (naranges != NULL)
66 13 : *naranges = dbg->aranges->naranges;
67 : return 0;
68 : }
69 :
70 64 : if (dbg->sectiondata[IDX_debug_aranges] == NULL)
71 : {
72 : /* No such section. */
73 4 : *aranges = NULL;
74 4 : if (naranges != NULL)
75 4 : *naranges = 0;
76 : return 0;
77 : }
78 :
79 60 : if (dbg->sectiondata[IDX_debug_aranges]->d_buf == NULL)
80 : return -1;
81 :
82 60 : struct arangelist *arangelist = NULL;
83 60 : unsigned int narangelist = 0;
84 :
85 60 : const unsigned char *readp = dbg->sectiondata[IDX_debug_aranges]->d_buf;
86 60 : const unsigned char *readendp
87 60 : = readp + dbg->sectiondata[IDX_debug_aranges]->d_size;
88 :
89 204 : while (readp < readendp)
90 : {
91 84 : const unsigned char *hdrstart = readp;
92 :
93 : /* Each entry starts with a header:
94 :
95 : 1. A 4-byte or 12-byte length containing the length of the
96 : set of entries for this compilation unit, not including the
97 : length field itself. [...]
98 :
99 : 2. A 2-byte version identifier containing the value 2 for
100 : DWARF Version 2.1.
101 :
102 : 3. A 4-byte or 8-byte offset into the .debug_info section. [...]
103 :
104 : 4. A 1-byte unsigned integer containing the size in bytes of
105 : an address (or the offset portion of an address for segmented
106 : addressing) on the target system.
107 :
108 : 5. A 1-byte unsigned integer containing the size in bytes of
109 : a segment descriptor on the target system. */
110 84 : if (unlikely (readp + 4 > readendp))
111 : goto invalid;
112 :
113 87 : Dwarf_Word length = read_4ubyte_unaligned_inc (dbg, readp);
114 84 : unsigned int length_bytes = 4;
115 84 : if (length == DWARF3_LENGTH_64_BIT)
116 : {
117 0 : if (unlikely (readp + 8 > readendp))
118 : goto invalid;
119 :
120 0 : length = read_8ubyte_unaligned_inc (dbg, readp);
121 0 : length_bytes = 8;
122 : }
123 84 : else if (unlikely (length >= DWARF3_LENGTH_MIN_ESCAPE_CODE
124 : && length <= DWARF3_LENGTH_MAX_ESCAPE_CODE))
125 : goto invalid;
126 :
127 84 : if (unlikely (readp + 2 > readendp))
128 : goto invalid;
129 :
130 84 : unsigned int version = read_2ubyte_unaligned_inc (dbg, readp);
131 84 : if (version != 2)
132 : {
133 0 : invalid:
134 0 : __libdw_seterrno (DWARF_E_INVALID_DWARF);
135 0 : fail:
136 0 : while (arangelist != NULL)
137 : {
138 0 : struct arangelist *next = arangelist->next;
139 0 : free (arangelist);
140 0 : arangelist = next;
141 : }
142 0 : return -1;
143 : }
144 :
145 84 : Dwarf_Word offset = 0;
146 84 : if (__libdw_read_offset_inc (dbg,
147 : IDX_debug_aranges, &readp,
148 : length_bytes, &offset, IDX_debug_info, 4))
149 : goto fail;
150 :
151 84 : unsigned int address_size = *readp++;
152 84 : if (unlikely (address_size != 4 && address_size != 8))
153 : goto invalid;
154 :
155 : /* We don't actually support segment selectors. */
156 84 : unsigned int segment_size = *readp++;
157 84 : if (segment_size != 0)
158 : goto invalid;
159 :
160 : /* Round the address to the next multiple of 2*address_size. */
161 168 : readp += ((2 * address_size - ((readp - hdrstart) % (2 * address_size)))
162 84 : % (2 * address_size));
163 :
164 : while (1)
165 97 : {
166 : Dwarf_Word range_address;
167 : Dwarf_Word range_length;
168 :
169 181 : if (__libdw_read_address_inc (dbg, IDX_debug_aranges, &readp,
170 : address_size, &range_address))
171 : goto fail;
172 :
173 181 : if (readp + address_size > readendp)
174 : goto invalid;
175 :
176 181 : if (address_size == 4)
177 94 : range_length = read_4ubyte_unaligned_inc (dbg, readp);
178 : else
179 93 : range_length = read_8ubyte_unaligned_inc (dbg, readp);
180 :
181 : /* Two zero values mark the end. */
182 181 : if (range_address == 0 && range_length == 0)
183 : break;
184 :
185 : /* We don't use alloca for these temporary structures because
186 : the total number of them can be quite large. */
187 97 : struct arangelist *new_arange = malloc (sizeof *new_arange);
188 97 : if (unlikely (new_arange == NULL))
189 : {
190 0 : __libdw_seterrno (DWARF_E_NOMEM);
191 0 : goto fail;
192 : }
193 :
194 97 : new_arange->arange.addr = range_address;
195 97 : new_arange->arange.length = range_length;
196 :
197 : /* We store the actual CU DIE offset, not the CU header offset. */
198 97 : Dwarf_CU *cu = __libdw_findcu (dbg, offset, false);
199 97 : if (unlikely (cu == NULL))
200 : goto fail;
201 194 : new_arange->arange.offset = __libdw_first_die_off_from_cu (cu);
202 :
203 97 : new_arange->next = arangelist;
204 97 : arangelist = new_arange;
205 97 : ++narangelist;
206 :
207 : /* Sanity-check the data. */
208 97 : if (unlikely (new_arange->arange.offset
209 : >= dbg->sectiondata[IDX_debug_info]->d_size))
210 : goto invalid;
211 : }
212 : }
213 :
214 60 : if (narangelist == 0)
215 : {
216 0 : assert (arangelist == NULL);
217 0 : if (naranges != NULL)
218 0 : *naranges = 0;
219 0 : *aranges = NULL;
220 0 : return 0;
221 : }
222 :
223 : /* Allocate the array for the result. */
224 60 : void *buf = libdw_alloc (dbg, Dwarf_Aranges,
225 : sizeof (Dwarf_Aranges)
226 : + narangelist * sizeof (Dwarf_Arange), 1);
227 :
228 : /* First use the buffer for the pointers, and sort the entries.
229 : We'll write the pointers in the end of the buffer, and then
230 : copy into the buffer from the beginning so the overlap works. */
231 : assert (sizeof (Dwarf_Arange) >= sizeof (Dwarf_Arange *));
232 60 : struct arangelist **sortaranges
233 : = (buf + sizeof (Dwarf_Aranges)
234 60 : + ((sizeof (Dwarf_Arange) - sizeof sortaranges[0]) * narangelist));
235 :
236 : /* The list is in LIFO order and usually they come in clumps with
237 : ascending addresses. So fill from the back to probably start with
238 : runs already in order before we sort. */
239 60 : unsigned int i = narangelist;
240 217 : while (i-- > 0)
241 : {
242 97 : sortaranges[i] = arangelist;
243 97 : arangelist = arangelist->next;
244 : }
245 60 : assert (arangelist == NULL);
246 :
247 : /* Sort by ascending address. */
248 60 : qsort (sortaranges, narangelist, sizeof sortaranges[0], &compare_aranges);
249 :
250 : /* Now that they are sorted, put them in the final array.
251 : The buffers overlap, so we've clobbered the early elements
252 : of SORTARANGES by the time we're reading the later ones. */
253 60 : *aranges = buf;
254 60 : (*aranges)->dbg = dbg;
255 60 : (*aranges)->naranges = narangelist;
256 60 : dbg->aranges = *aranges;
257 60 : if (naranges != NULL)
258 60 : *naranges = narangelist;
259 97 : for (i = 0; i < narangelist; ++i)
260 : {
261 97 : struct arangelist *elt = sortaranges[i];
262 97 : (*aranges)->info[i] = elt->arange;
263 97 : free (elt);
264 : }
265 :
266 : return 0;
267 : }
268 : INTDEF(dwarf_getaranges)
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