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1a4d82fc | 1 | /* elf.c -- Get debug data from an ELF file for backtraces. |
ba9703b0 | 2 | Copyright (C) 2012-2020 Free Software Foundation, Inc. |
1a4d82fc JJ |
3 | Written by Ian Lance Taylor, Google. |
4 | ||
5 | Redistribution and use in source and binary forms, with or without | |
6 | modification, are permitted provided that the following conditions are | |
7 | met: | |
8 | ||
9 | (1) Redistributions of source code must retain the above copyright | |
94b46f34 | 10 | notice, this list of conditions and the following disclaimer. |
1a4d82fc JJ |
11 | |
12 | (2) Redistributions in binary form must reproduce the above copyright | |
13 | notice, this list of conditions and the following disclaimer in | |
14 | the documentation and/or other materials provided with the | |
94b46f34 XL |
15 | distribution. |
16 | ||
1a4d82fc JJ |
17 | (3) The name of the author may not be used to |
18 | endorse or promote products derived from this software without | |
19 | specific prior written permission. | |
20 | ||
21 | THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
22 | IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
23 | WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
24 | DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, | |
25 | INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
26 | (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
27 | SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
29 | STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
30 | IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
31 | POSSIBILITY OF SUCH DAMAGE. */ | |
32 | ||
33 | #include "config.h" | |
34 | ||
94b46f34 | 35 | #include <errno.h> |
1a4d82fc JJ |
36 | #include <stdlib.h> |
37 | #include <string.h> | |
38 | #include <sys/types.h> | |
94b46f34 XL |
39 | #include <sys/stat.h> |
40 | #include <unistd.h> | |
1a4d82fc JJ |
41 | |
42 | #ifdef HAVE_DL_ITERATE_PHDR | |
43 | #include <link.h> | |
44 | #endif | |
45 | ||
46 | #include "backtrace.h" | |
47 | #include "internal.h" | |
48 | ||
94b46f34 XL |
49 | #ifndef S_ISLNK |
50 | #ifndef S_IFLNK | |
51 | #define S_IFLNK 0120000 | |
52 | #endif | |
53 | #ifndef S_IFMT | |
54 | #define S_IFMT 0170000 | |
55 | #endif | |
56 | #define S_ISLNK(m) (((m) & S_IFMT) == S_IFLNK) | |
57 | #endif | |
58 | ||
59 | #ifndef __GNUC__ | |
60 | #define __builtin_prefetch(p, r, l) | |
61 | #define unlikely(x) (x) | |
62 | #else | |
63 | #define unlikely(x) __builtin_expect(!!(x), 0) | |
64 | #endif | |
65 | ||
66 | #if !defined(HAVE_DECL_STRNLEN) || !HAVE_DECL_STRNLEN | |
67 | ||
68 | /* If strnlen is not declared, provide our own version. */ | |
69 | ||
70 | static size_t | |
71 | xstrnlen (const char *s, size_t maxlen) | |
72 | { | |
73 | size_t i; | |
74 | ||
75 | for (i = 0; i < maxlen; ++i) | |
76 | if (s[i] == '\0') | |
77 | break; | |
78 | return i; | |
79 | } | |
80 | ||
81 | #define strnlen xstrnlen | |
82 | ||
83 | #endif | |
84 | ||
85 | #ifndef HAVE_LSTAT | |
86 | ||
87 | /* Dummy version of lstat for systems that don't have it. */ | |
88 | ||
89 | static int | |
90 | xlstat (const char *path ATTRIBUTE_UNUSED, struct stat *st ATTRIBUTE_UNUSED) | |
91 | { | |
92 | return -1; | |
93 | } | |
94 | ||
95 | #define lstat xlstat | |
96 | ||
97 | #endif | |
98 | ||
99 | #ifndef HAVE_READLINK | |
100 | ||
101 | /* Dummy version of readlink for systems that don't have it. */ | |
102 | ||
103 | static ssize_t | |
104 | xreadlink (const char *path ATTRIBUTE_UNUSED, char *buf ATTRIBUTE_UNUSED, | |
105 | size_t bufsz ATTRIBUTE_UNUSED) | |
106 | { | |
107 | return -1; | |
108 | } | |
109 | ||
110 | #define readlink xreadlink | |
111 | ||
112 | #endif | |
113 | ||
1a4d82fc JJ |
114 | #ifndef HAVE_DL_ITERATE_PHDR |
115 | ||
116 | /* Dummy version of dl_iterate_phdr for systems that don't have it. */ | |
117 | ||
118 | #define dl_phdr_info x_dl_phdr_info | |
119 | #define dl_iterate_phdr x_dl_iterate_phdr | |
120 | ||
121 | struct dl_phdr_info | |
122 | { | |
123 | uintptr_t dlpi_addr; | |
124 | const char *dlpi_name; | |
125 | }; | |
126 | ||
127 | static int | |
128 | dl_iterate_phdr (int (*callback) (struct dl_phdr_info *, | |
129 | size_t, void *) ATTRIBUTE_UNUSED, | |
130 | void *data ATTRIBUTE_UNUSED) | |
131 | { | |
132 | return 0; | |
133 | } | |
134 | ||
135 | #endif /* ! defined (HAVE_DL_ITERATE_PHDR) */ | |
136 | ||
137 | /* The configure script must tell us whether we are 32-bit or 64-bit | |
138 | ELF. We could make this code test and support either possibility, | |
139 | but there is no point. This code only works for the currently | |
140 | running executable, which means that we know the ELF mode at | |
94b46f34 | 141 | configure time. */ |
1a4d82fc JJ |
142 | |
143 | #if BACKTRACE_ELF_SIZE != 32 && BACKTRACE_ELF_SIZE != 64 | |
144 | #error "Unknown BACKTRACE_ELF_SIZE" | |
145 | #endif | |
146 | ||
147 | /* <link.h> might #include <elf.h> which might define our constants | |
148 | with slightly different values. Undefine them to be safe. */ | |
149 | ||
150 | #undef EI_NIDENT | |
151 | #undef EI_MAG0 | |
152 | #undef EI_MAG1 | |
153 | #undef EI_MAG2 | |
154 | #undef EI_MAG3 | |
155 | #undef EI_CLASS | |
156 | #undef EI_DATA | |
157 | #undef EI_VERSION | |
158 | #undef ELF_MAG0 | |
159 | #undef ELF_MAG1 | |
160 | #undef ELF_MAG2 | |
161 | #undef ELF_MAG3 | |
162 | #undef ELFCLASS32 | |
163 | #undef ELFCLASS64 | |
164 | #undef ELFDATA2LSB | |
165 | #undef ELFDATA2MSB | |
166 | #undef EV_CURRENT | |
167 | #undef ET_DYN | |
94b46f34 XL |
168 | #undef EM_PPC64 |
169 | #undef EF_PPC64_ABI | |
1a4d82fc JJ |
170 | #undef SHN_LORESERVE |
171 | #undef SHN_XINDEX | |
172 | #undef SHN_UNDEF | |
94b46f34 | 173 | #undef SHT_PROGBITS |
1a4d82fc JJ |
174 | #undef SHT_SYMTAB |
175 | #undef SHT_STRTAB | |
176 | #undef SHT_DYNSYM | |
94b46f34 | 177 | #undef SHF_COMPRESSED |
1a4d82fc JJ |
178 | #undef STT_OBJECT |
179 | #undef STT_FUNC | |
94b46f34 XL |
180 | #undef NT_GNU_BUILD_ID |
181 | #undef ELFCOMPRESS_ZLIB | |
1a4d82fc JJ |
182 | |
183 | /* Basic types. */ | |
184 | ||
185 | typedef uint16_t b_elf_half; /* Elf_Half. */ | |
186 | typedef uint32_t b_elf_word; /* Elf_Word. */ | |
187 | typedef int32_t b_elf_sword; /* Elf_Sword. */ | |
188 | ||
189 | #if BACKTRACE_ELF_SIZE == 32 | |
190 | ||
191 | typedef uint32_t b_elf_addr; /* Elf_Addr. */ | |
192 | typedef uint32_t b_elf_off; /* Elf_Off. */ | |
193 | ||
194 | typedef uint32_t b_elf_wxword; /* 32-bit Elf_Word, 64-bit ELF_Xword. */ | |
195 | ||
196 | #else | |
197 | ||
198 | typedef uint64_t b_elf_addr; /* Elf_Addr. */ | |
199 | typedef uint64_t b_elf_off; /* Elf_Off. */ | |
200 | typedef uint64_t b_elf_xword; /* Elf_Xword. */ | |
201 | typedef int64_t b_elf_sxword; /* Elf_Sxword. */ | |
202 | ||
203 | typedef uint64_t b_elf_wxword; /* 32-bit Elf_Word, 64-bit ELF_Xword. */ | |
204 | ||
205 | #endif | |
206 | ||
207 | /* Data structures and associated constants. */ | |
208 | ||
209 | #define EI_NIDENT 16 | |
210 | ||
211 | typedef struct { | |
212 | unsigned char e_ident[EI_NIDENT]; /* ELF "magic number" */ | |
213 | b_elf_half e_type; /* Identifies object file type */ | |
214 | b_elf_half e_machine; /* Specifies required architecture */ | |
215 | b_elf_word e_version; /* Identifies object file version */ | |
216 | b_elf_addr e_entry; /* Entry point virtual address */ | |
217 | b_elf_off e_phoff; /* Program header table file offset */ | |
218 | b_elf_off e_shoff; /* Section header table file offset */ | |
219 | b_elf_word e_flags; /* Processor-specific flags */ | |
220 | b_elf_half e_ehsize; /* ELF header size in bytes */ | |
221 | b_elf_half e_phentsize; /* Program header table entry size */ | |
222 | b_elf_half e_phnum; /* Program header table entry count */ | |
223 | b_elf_half e_shentsize; /* Section header table entry size */ | |
224 | b_elf_half e_shnum; /* Section header table entry count */ | |
225 | b_elf_half e_shstrndx; /* Section header string table index */ | |
226 | } b_elf_ehdr; /* Elf_Ehdr. */ | |
227 | ||
228 | #define EI_MAG0 0 | |
229 | #define EI_MAG1 1 | |
230 | #define EI_MAG2 2 | |
231 | #define EI_MAG3 3 | |
232 | #define EI_CLASS 4 | |
233 | #define EI_DATA 5 | |
234 | #define EI_VERSION 6 | |
235 | ||
236 | #define ELFMAG0 0x7f | |
237 | #define ELFMAG1 'E' | |
238 | #define ELFMAG2 'L' | |
239 | #define ELFMAG3 'F' | |
240 | ||
241 | #define ELFCLASS32 1 | |
242 | #define ELFCLASS64 2 | |
243 | ||
244 | #define ELFDATA2LSB 1 | |
245 | #define ELFDATA2MSB 2 | |
246 | ||
247 | #define EV_CURRENT 1 | |
248 | ||
249 | #define ET_DYN 3 | |
250 | ||
94b46f34 XL |
251 | #define EM_PPC64 21 |
252 | #define EF_PPC64_ABI 3 | |
253 | ||
1a4d82fc JJ |
254 | typedef struct { |
255 | b_elf_word sh_name; /* Section name, index in string tbl */ | |
256 | b_elf_word sh_type; /* Type of section */ | |
257 | b_elf_wxword sh_flags; /* Miscellaneous section attributes */ | |
258 | b_elf_addr sh_addr; /* Section virtual addr at execution */ | |
259 | b_elf_off sh_offset; /* Section file offset */ | |
260 | b_elf_wxword sh_size; /* Size of section in bytes */ | |
261 | b_elf_word sh_link; /* Index of another section */ | |
262 | b_elf_word sh_info; /* Additional section information */ | |
263 | b_elf_wxword sh_addralign; /* Section alignment */ | |
264 | b_elf_wxword sh_entsize; /* Entry size if section holds table */ | |
265 | } b_elf_shdr; /* Elf_Shdr. */ | |
266 | ||
267 | #define SHN_UNDEF 0x0000 /* Undefined section */ | |
268 | #define SHN_LORESERVE 0xFF00 /* Begin range of reserved indices */ | |
269 | #define SHN_XINDEX 0xFFFF /* Section index is held elsewhere */ | |
270 | ||
94b46f34 | 271 | #define SHT_PROGBITS 1 |
1a4d82fc JJ |
272 | #define SHT_SYMTAB 2 |
273 | #define SHT_STRTAB 3 | |
274 | #define SHT_DYNSYM 11 | |
275 | ||
94b46f34 XL |
276 | #define SHF_COMPRESSED 0x800 |
277 | ||
1a4d82fc JJ |
278 | #if BACKTRACE_ELF_SIZE == 32 |
279 | ||
280 | typedef struct | |
281 | { | |
282 | b_elf_word st_name; /* Symbol name, index in string tbl */ | |
283 | b_elf_addr st_value; /* Symbol value */ | |
284 | b_elf_word st_size; /* Symbol size */ | |
285 | unsigned char st_info; /* Symbol binding and type */ | |
286 | unsigned char st_other; /* Visibility and other data */ | |
287 | b_elf_half st_shndx; /* Symbol section index */ | |
288 | } b_elf_sym; /* Elf_Sym. */ | |
289 | ||
290 | #else /* BACKTRACE_ELF_SIZE != 32 */ | |
291 | ||
292 | typedef struct | |
293 | { | |
294 | b_elf_word st_name; /* Symbol name, index in string tbl */ | |
295 | unsigned char st_info; /* Symbol binding and type */ | |
296 | unsigned char st_other; /* Visibility and other data */ | |
297 | b_elf_half st_shndx; /* Symbol section index */ | |
298 | b_elf_addr st_value; /* Symbol value */ | |
299 | b_elf_xword st_size; /* Symbol size */ | |
300 | } b_elf_sym; /* Elf_Sym. */ | |
301 | ||
302 | #endif /* BACKTRACE_ELF_SIZE != 32 */ | |
303 | ||
304 | #define STT_OBJECT 1 | |
305 | #define STT_FUNC 2 | |
306 | ||
94b46f34 XL |
307 | typedef struct |
308 | { | |
309 | uint32_t namesz; | |
310 | uint32_t descsz; | |
311 | uint32_t type; | |
312 | char name[1]; | |
313 | } b_elf_note; | |
314 | ||
315 | #define NT_GNU_BUILD_ID 3 | |
316 | ||
317 | #if BACKTRACE_ELF_SIZE == 32 | |
318 | ||
319 | typedef struct | |
320 | { | |
321 | b_elf_word ch_type; /* Compresstion algorithm */ | |
322 | b_elf_word ch_size; /* Uncompressed size */ | |
323 | b_elf_word ch_addralign; /* Alignment for uncompressed data */ | |
324 | } b_elf_chdr; /* Elf_Chdr */ | |
325 | ||
326 | #else /* BACKTRACE_ELF_SIZE != 32 */ | |
327 | ||
328 | typedef struct | |
329 | { | |
330 | b_elf_word ch_type; /* Compression algorithm */ | |
331 | b_elf_word ch_reserved; /* Reserved */ | |
332 | b_elf_xword ch_size; /* Uncompressed size */ | |
333 | b_elf_xword ch_addralign; /* Alignment for uncompressed data */ | |
334 | } b_elf_chdr; /* Elf_Chdr */ | |
335 | ||
336 | #endif /* BACKTRACE_ELF_SIZE != 32 */ | |
337 | ||
338 | #define ELFCOMPRESS_ZLIB 1 | |
339 | ||
ba9703b0 | 340 | /* Names of sections, indexed by enum dwarf_section in internal.h. */ |
1a4d82fc | 341 | |
ba9703b0 | 342 | static const char * const dwarf_section_names[DEBUG_MAX] = |
1a4d82fc JJ |
343 | { |
344 | ".debug_info", | |
345 | ".debug_line", | |
346 | ".debug_abbrev", | |
347 | ".debug_ranges", | |
94b46f34 | 348 | ".debug_str", |
ba9703b0 XL |
349 | ".debug_addr", |
350 | ".debug_str_offsets", | |
351 | ".debug_line_str", | |
352 | ".debug_rnglists" | |
1a4d82fc JJ |
353 | }; |
354 | ||
355 | /* Information we gather for the sections we care about. */ | |
356 | ||
357 | struct debug_section_info | |
358 | { | |
359 | /* Section file offset. */ | |
360 | off_t offset; | |
361 | /* Section size. */ | |
362 | size_t size; | |
363 | /* Section contents, after read from file. */ | |
364 | const unsigned char *data; | |
94b46f34 XL |
365 | /* Whether the SHF_COMPRESSED flag is set for the section. */ |
366 | int compressed; | |
1a4d82fc JJ |
367 | }; |
368 | ||
369 | /* Information we keep for an ELF symbol. */ | |
370 | ||
371 | struct elf_symbol | |
372 | { | |
373 | /* The name of the symbol. */ | |
374 | const char *name; | |
375 | /* The address of the symbol. */ | |
376 | uintptr_t address; | |
377 | /* The size of the symbol. */ | |
378 | size_t size; | |
379 | }; | |
380 | ||
381 | /* Information to pass to elf_syminfo. */ | |
382 | ||
383 | struct elf_syminfo_data | |
384 | { | |
385 | /* Symbols for the next module. */ | |
386 | struct elf_syminfo_data *next; | |
387 | /* The ELF symbols, sorted by address. */ | |
388 | struct elf_symbol *symbols; | |
389 | /* The number of symbols. */ | |
390 | size_t count; | |
391 | }; | |
392 | ||
94b46f34 XL |
393 | /* Information about PowerPC64 ELFv1 .opd section. */ |
394 | ||
395 | struct elf_ppc64_opd_data | |
396 | { | |
397 | /* Address of the .opd section. */ | |
398 | b_elf_addr addr; | |
399 | /* Section data. */ | |
400 | const char *data; | |
401 | /* Size of the .opd section. */ | |
402 | size_t size; | |
403 | /* Corresponding section view. */ | |
404 | struct backtrace_view view; | |
405 | }; | |
406 | ||
407 | /* Compute the CRC-32 of BUF/LEN. This uses the CRC used for | |
408 | .gnu_debuglink files. */ | |
409 | ||
410 | static uint32_t | |
411 | elf_crc32 (uint32_t crc, const unsigned char *buf, size_t len) | |
412 | { | |
413 | static const uint32_t crc32_table[256] = | |
414 | { | |
415 | 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, | |
416 | 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, | |
417 | 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, | |
418 | 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, | |
419 | 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, | |
420 | 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, | |
421 | 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, | |
422 | 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, | |
423 | 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, | |
424 | 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, | |
425 | 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, | |
426 | 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, | |
427 | 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, | |
428 | 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, | |
429 | 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, | |
430 | 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, | |
431 | 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, | |
432 | 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, | |
433 | 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, | |
434 | 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, | |
435 | 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, | |
436 | 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, | |
437 | 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, | |
438 | 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, | |
439 | 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, | |
440 | 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, | |
441 | 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, | |
442 | 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, | |
443 | 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, | |
444 | 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, | |
445 | 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, | |
446 | 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, | |
447 | 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, | |
448 | 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, | |
449 | 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, | |
450 | 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, | |
451 | 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, | |
452 | 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, | |
453 | 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, | |
454 | 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, | |
455 | 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, | |
456 | 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, | |
457 | 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, | |
458 | 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, | |
459 | 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, | |
460 | 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, | |
461 | 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, | |
462 | 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, | |
463 | 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, | |
464 | 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, | |
465 | 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, | |
466 | 0x2d02ef8d | |
467 | }; | |
468 | const unsigned char *end; | |
469 | ||
470 | crc = ~crc; | |
471 | for (end = buf + len; buf < end; ++ buf) | |
472 | crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8); | |
473 | return ~crc; | |
474 | } | |
475 | ||
476 | /* Return the CRC-32 of the entire file open at DESCRIPTOR. */ | |
477 | ||
478 | static uint32_t | |
479 | elf_crc32_file (struct backtrace_state *state, int descriptor, | |
480 | backtrace_error_callback error_callback, void *data) | |
481 | { | |
482 | struct stat st; | |
483 | struct backtrace_view file_view; | |
484 | uint32_t ret; | |
485 | ||
486 | if (fstat (descriptor, &st) < 0) | |
487 | { | |
488 | error_callback (data, "fstat", errno); | |
489 | return 0; | |
490 | } | |
491 | ||
492 | if (!backtrace_get_view (state, descriptor, 0, st.st_size, error_callback, | |
493 | data, &file_view)) | |
494 | return 0; | |
495 | ||
496 | ret = elf_crc32 (0, (const unsigned char *) file_view.data, st.st_size); | |
497 | ||
498 | backtrace_release_view (state, &file_view, error_callback, data); | |
499 | ||
500 | return ret; | |
501 | } | |
502 | ||
1a4d82fc JJ |
503 | /* A dummy callback function used when we can't find any debug info. */ |
504 | ||
505 | static int | |
506 | elf_nodebug (struct backtrace_state *state ATTRIBUTE_UNUSED, | |
507 | uintptr_t pc ATTRIBUTE_UNUSED, | |
508 | backtrace_full_callback callback ATTRIBUTE_UNUSED, | |
509 | backtrace_error_callback error_callback, void *data) | |
510 | { | |
511 | error_callback (data, "no debug info in ELF executable", -1); | |
512 | return 0; | |
513 | } | |
514 | ||
515 | /* A dummy callback function used when we can't find a symbol | |
516 | table. */ | |
517 | ||
518 | static void | |
519 | elf_nosyms (struct backtrace_state *state ATTRIBUTE_UNUSED, | |
520 | uintptr_t addr ATTRIBUTE_UNUSED, | |
521 | backtrace_syminfo_callback callback ATTRIBUTE_UNUSED, | |
522 | backtrace_error_callback error_callback, void *data) | |
523 | { | |
524 | error_callback (data, "no symbol table in ELF executable", -1); | |
525 | } | |
526 | ||
527 | /* Compare struct elf_symbol for qsort. */ | |
528 | ||
529 | static int | |
530 | elf_symbol_compare (const void *v1, const void *v2) | |
531 | { | |
532 | const struct elf_symbol *e1 = (const struct elf_symbol *) v1; | |
533 | const struct elf_symbol *e2 = (const struct elf_symbol *) v2; | |
534 | ||
535 | if (e1->address < e2->address) | |
536 | return -1; | |
537 | else if (e1->address > e2->address) | |
538 | return 1; | |
539 | else | |
540 | return 0; | |
541 | } | |
542 | ||
543 | /* Compare an ADDR against an elf_symbol for bsearch. We allocate one | |
544 | extra entry in the array so that this can look safely at the next | |
545 | entry. */ | |
546 | ||
547 | static int | |
548 | elf_symbol_search (const void *vkey, const void *ventry) | |
549 | { | |
550 | const uintptr_t *key = (const uintptr_t *) vkey; | |
551 | const struct elf_symbol *entry = (const struct elf_symbol *) ventry; | |
552 | uintptr_t addr; | |
553 | ||
554 | addr = *key; | |
555 | if (addr < entry->address) | |
556 | return -1; | |
557 | else if (addr >= entry->address + entry->size) | |
558 | return 1; | |
559 | else | |
560 | return 0; | |
561 | } | |
562 | ||
563 | /* Initialize the symbol table info for elf_syminfo. */ | |
564 | ||
565 | static int | |
566 | elf_initialize_syminfo (struct backtrace_state *state, | |
567 | uintptr_t base_address, | |
568 | const unsigned char *symtab_data, size_t symtab_size, | |
569 | const unsigned char *strtab, size_t strtab_size, | |
570 | backtrace_error_callback error_callback, | |
94b46f34 XL |
571 | void *data, struct elf_syminfo_data *sdata, |
572 | struct elf_ppc64_opd_data *opd) | |
1a4d82fc JJ |
573 | { |
574 | size_t sym_count; | |
575 | const b_elf_sym *sym; | |
576 | size_t elf_symbol_count; | |
577 | size_t elf_symbol_size; | |
578 | struct elf_symbol *elf_symbols; | |
579 | size_t i; | |
580 | unsigned int j; | |
581 | ||
582 | sym_count = symtab_size / sizeof (b_elf_sym); | |
583 | ||
584 | /* We only care about function symbols. Count them. */ | |
585 | sym = (const b_elf_sym *) symtab_data; | |
586 | elf_symbol_count = 0; | |
587 | for (i = 0; i < sym_count; ++i, ++sym) | |
588 | { | |
589 | int info; | |
590 | ||
591 | info = sym->st_info & 0xf; | |
592 | if ((info == STT_FUNC || info == STT_OBJECT) | |
593 | && sym->st_shndx != SHN_UNDEF) | |
594 | ++elf_symbol_count; | |
595 | } | |
596 | ||
597 | elf_symbol_size = elf_symbol_count * sizeof (struct elf_symbol); | |
598 | elf_symbols = ((struct elf_symbol *) | |
599 | backtrace_alloc (state, elf_symbol_size, error_callback, | |
600 | data)); | |
601 | if (elf_symbols == NULL) | |
602 | return 0; | |
603 | ||
604 | sym = (const b_elf_sym *) symtab_data; | |
605 | j = 0; | |
606 | for (i = 0; i < sym_count; ++i, ++sym) | |
607 | { | |
608 | int info; | |
609 | ||
610 | info = sym->st_info & 0xf; | |
611 | if (info != STT_FUNC && info != STT_OBJECT) | |
612 | continue; | |
613 | if (sym->st_shndx == SHN_UNDEF) | |
614 | continue; | |
615 | if (sym->st_name >= strtab_size) | |
616 | { | |
617 | error_callback (data, "symbol string index out of range", 0); | |
618 | backtrace_free (state, elf_symbols, elf_symbol_size, error_callback, | |
619 | data); | |
620 | return 0; | |
621 | } | |
622 | elf_symbols[j].name = (const char *) strtab + sym->st_name; | |
94b46f34 XL |
623 | /* Special case PowerPC64 ELFv1 symbols in .opd section, if the symbol |
624 | is a function descriptor, read the actual code address from the | |
625 | descriptor. */ | |
626 | if (opd | |
627 | && sym->st_value >= opd->addr | |
628 | && sym->st_value < opd->addr + opd->size) | |
629 | elf_symbols[j].address | |
630 | = *(const b_elf_addr *) (opd->data + (sym->st_value - opd->addr)); | |
631 | else | |
632 | elf_symbols[j].address = sym->st_value; | |
633 | elf_symbols[j].address += base_address; | |
1a4d82fc JJ |
634 | elf_symbols[j].size = sym->st_size; |
635 | ++j; | |
636 | } | |
637 | ||
9346a6ac AL |
638 | backtrace_qsort (elf_symbols, elf_symbol_count, sizeof (struct elf_symbol), |
639 | elf_symbol_compare); | |
1a4d82fc JJ |
640 | |
641 | sdata->next = NULL; | |
642 | sdata->symbols = elf_symbols; | |
643 | sdata->count = elf_symbol_count; | |
644 | ||
645 | return 1; | |
646 | } | |
647 | ||
648 | /* Add EDATA to the list in STATE. */ | |
649 | ||
650 | static void | |
651 | elf_add_syminfo_data (struct backtrace_state *state, | |
652 | struct elf_syminfo_data *edata) | |
653 | { | |
654 | if (!state->threaded) | |
655 | { | |
656 | struct elf_syminfo_data **pp; | |
657 | ||
658 | for (pp = (struct elf_syminfo_data **) (void *) &state->syminfo_data; | |
659 | *pp != NULL; | |
660 | pp = &(*pp)->next) | |
661 | ; | |
662 | *pp = edata; | |
663 | } | |
664 | else | |
665 | { | |
666 | while (1) | |
667 | { | |
668 | struct elf_syminfo_data **pp; | |
669 | ||
670 | pp = (struct elf_syminfo_data **) (void *) &state->syminfo_data; | |
671 | ||
672 | while (1) | |
673 | { | |
674 | struct elf_syminfo_data *p; | |
675 | ||
676 | p = backtrace_atomic_load_pointer (pp); | |
677 | ||
678 | if (p == NULL) | |
679 | break; | |
680 | ||
681 | pp = &p->next; | |
682 | } | |
683 | ||
684 | if (__sync_bool_compare_and_swap (pp, NULL, edata)) | |
685 | break; | |
686 | } | |
687 | } | |
688 | } | |
689 | ||
690 | /* Return the symbol name and value for an ADDR. */ | |
691 | ||
692 | static void | |
693 | elf_syminfo (struct backtrace_state *state, uintptr_t addr, | |
694 | backtrace_syminfo_callback callback, | |
695 | backtrace_error_callback error_callback ATTRIBUTE_UNUSED, | |
696 | void *data) | |
697 | { | |
698 | struct elf_syminfo_data *edata; | |
699 | struct elf_symbol *sym = NULL; | |
700 | ||
701 | if (!state->threaded) | |
702 | { | |
703 | for (edata = (struct elf_syminfo_data *) state->syminfo_data; | |
704 | edata != NULL; | |
705 | edata = edata->next) | |
706 | { | |
707 | sym = ((struct elf_symbol *) | |
708 | bsearch (&addr, edata->symbols, edata->count, | |
709 | sizeof (struct elf_symbol), elf_symbol_search)); | |
710 | if (sym != NULL) | |
711 | break; | |
712 | } | |
713 | } | |
714 | else | |
715 | { | |
716 | struct elf_syminfo_data **pp; | |
717 | ||
718 | pp = (struct elf_syminfo_data **) (void *) &state->syminfo_data; | |
719 | while (1) | |
720 | { | |
721 | edata = backtrace_atomic_load_pointer (pp); | |
722 | if (edata == NULL) | |
723 | break; | |
724 | ||
725 | sym = ((struct elf_symbol *) | |
726 | bsearch (&addr, edata->symbols, edata->count, | |
727 | sizeof (struct elf_symbol), elf_symbol_search)); | |
728 | if (sym != NULL) | |
729 | break; | |
730 | ||
731 | pp = &edata->next; | |
732 | } | |
733 | } | |
734 | ||
735 | if (sym == NULL) | |
736 | callback (data, addr, NULL, 0, 0); | |
737 | else | |
738 | callback (data, addr, sym->name, sym->address, sym->size); | |
739 | } | |
740 | ||
94b46f34 | 741 | /* Return whether FILENAME is a symlink. */ |
1a4d82fc JJ |
742 | |
743 | static int | |
94b46f34 | 744 | elf_is_symlink (const char *filename) |
1a4d82fc | 745 | { |
94b46f34 | 746 | struct stat st; |
1a4d82fc | 747 | |
94b46f34 XL |
748 | if (lstat (filename, &st) < 0) |
749 | return 0; | |
750 | return S_ISLNK (st.st_mode); | |
751 | } | |
1a4d82fc | 752 | |
94b46f34 XL |
753 | /* Return the results of reading the symlink FILENAME in a buffer |
754 | allocated by backtrace_alloc. Return the length of the buffer in | |
755 | *LEN. */ | |
1a4d82fc | 756 | |
94b46f34 XL |
757 | static char * |
758 | elf_readlink (struct backtrace_state *state, const char *filename, | |
759 | backtrace_error_callback error_callback, void *data, | |
760 | size_t *plen) | |
761 | { | |
762 | size_t len; | |
763 | char *buf; | |
1a4d82fc | 764 | |
94b46f34 XL |
765 | len = 128; |
766 | while (1) | |
1a4d82fc | 767 | { |
94b46f34 XL |
768 | ssize_t rl; |
769 | ||
770 | buf = backtrace_alloc (state, len, error_callback, data); | |
771 | if (buf == NULL) | |
772 | return NULL; | |
773 | rl = readlink (filename, buf, len); | |
774 | if (rl < 0) | |
775 | { | |
776 | backtrace_free (state, buf, len, error_callback, data); | |
777 | return NULL; | |
778 | } | |
779 | if ((size_t) rl < len - 1) | |
780 | { | |
781 | buf[rl] = '\0'; | |
782 | *plen = len; | |
783 | return buf; | |
784 | } | |
785 | backtrace_free (state, buf, len, error_callback, data); | |
786 | len *= 2; | |
1a4d82fc | 787 | } |
94b46f34 | 788 | } |
1a4d82fc | 789 | |
ba9703b0 XL |
790 | #define SYSTEM_BUILD_ID_DIR "/usr/lib/debug/.build-id/" |
791 | ||
94b46f34 XL |
792 | /* Open a separate debug info file, using the build ID to find it. |
793 | Returns an open file descriptor, or -1. | |
1a4d82fc | 794 | |
94b46f34 XL |
795 | The GDB manual says that the only place gdb looks for a debug file |
796 | when the build ID is known is in /usr/lib/debug/.build-id. */ | |
1a4d82fc | 797 | |
94b46f34 XL |
798 | static int |
799 | elf_open_debugfile_by_buildid (struct backtrace_state *state, | |
800 | const char *buildid_data, size_t buildid_size, | |
801 | backtrace_error_callback error_callback, | |
802 | void *data) | |
803 | { | |
ba9703b0 | 804 | const char * const prefix = SYSTEM_BUILD_ID_DIR; |
94b46f34 XL |
805 | const size_t prefix_len = strlen (prefix); |
806 | const char * const suffix = ".debug"; | |
807 | const size_t suffix_len = strlen (suffix); | |
808 | size_t len; | |
809 | char *bd_filename; | |
810 | char *t; | |
811 | size_t i; | |
812 | int ret; | |
813 | int does_not_exist; | |
1a4d82fc | 814 | |
94b46f34 XL |
815 | len = prefix_len + buildid_size * 2 + suffix_len + 2; |
816 | bd_filename = backtrace_alloc (state, len, error_callback, data); | |
817 | if (bd_filename == NULL) | |
1a4d82fc JJ |
818 | return -1; |
819 | ||
94b46f34 XL |
820 | t = bd_filename; |
821 | memcpy (t, prefix, prefix_len); | |
822 | t += prefix_len; | |
823 | for (i = 0; i < buildid_size; i++) | |
1a4d82fc | 824 | { |
94b46f34 XL |
825 | unsigned char b; |
826 | unsigned char nib; | |
827 | ||
828 | b = (unsigned char) buildid_data[i]; | |
829 | nib = (b & 0xf0) >> 4; | |
830 | *t++ = nib < 10 ? '0' + nib : 'a' + nib - 10; | |
831 | nib = b & 0x0f; | |
832 | *t++ = nib < 10 ? '0' + nib : 'a' + nib - 10; | |
833 | if (i == 0) | |
834 | *t++ = '/'; | |
835 | } | |
836 | memcpy (t, suffix, suffix_len); | |
837 | t[suffix_len] = '\0'; | |
1a4d82fc | 838 | |
94b46f34 | 839 | ret = backtrace_open (bd_filename, error_callback, data, &does_not_exist); |
1a4d82fc | 840 | |
94b46f34 | 841 | backtrace_free (state, bd_filename, len, error_callback, data); |
1a4d82fc | 842 | |
94b46f34 XL |
843 | /* gdb checks that the debuginfo file has the same build ID note. |
844 | That seems kind of pointless to me--why would it have the right | |
845 | name but not the right build ID?--so skipping the check. */ | |
1a4d82fc | 846 | |
94b46f34 XL |
847 | return ret; |
848 | } | |
1a4d82fc | 849 | |
94b46f34 XL |
850 | /* Try to open a file whose name is PREFIX (length PREFIX_LEN) |
851 | concatenated with PREFIX2 (length PREFIX2_LEN) concatenated with | |
852 | DEBUGLINK_NAME. Returns an open file descriptor, or -1. */ | |
1a4d82fc | 853 | |
94b46f34 XL |
854 | static int |
855 | elf_try_debugfile (struct backtrace_state *state, const char *prefix, | |
856 | size_t prefix_len, const char *prefix2, size_t prefix2_len, | |
857 | const char *debuglink_name, | |
858 | backtrace_error_callback error_callback, void *data) | |
859 | { | |
860 | size_t debuglink_len; | |
861 | size_t try_len; | |
862 | char *try; | |
863 | int does_not_exist; | |
864 | int ret; | |
1a4d82fc | 865 | |
94b46f34 XL |
866 | debuglink_len = strlen (debuglink_name); |
867 | try_len = prefix_len + prefix2_len + debuglink_len + 1; | |
868 | try = backtrace_alloc (state, try_len, error_callback, data); | |
869 | if (try == NULL) | |
870 | return -1; | |
1a4d82fc | 871 | |
94b46f34 XL |
872 | memcpy (try, prefix, prefix_len); |
873 | memcpy (try + prefix_len, prefix2, prefix2_len); | |
874 | memcpy (try + prefix_len + prefix2_len, debuglink_name, debuglink_len); | |
875 | try[prefix_len + prefix2_len + debuglink_len] = '\0'; | |
1a4d82fc | 876 | |
94b46f34 | 877 | ret = backtrace_open (try, error_callback, data, &does_not_exist); |
1a4d82fc | 878 | |
94b46f34 | 879 | backtrace_free (state, try, try_len, error_callback, data); |
1a4d82fc | 880 | |
94b46f34 XL |
881 | return ret; |
882 | } | |
1a4d82fc | 883 | |
94b46f34 XL |
884 | /* Find a separate debug info file, using the debuglink section data |
885 | to find it. Returns an open file descriptor, or -1. */ | |
1a4d82fc | 886 | |
94b46f34 XL |
887 | static int |
888 | elf_find_debugfile_by_debuglink (struct backtrace_state *state, | |
889 | const char *filename, | |
890 | const char *debuglink_name, | |
891 | backtrace_error_callback error_callback, | |
892 | void *data) | |
893 | { | |
894 | int ret; | |
895 | char *alc; | |
896 | size_t alc_len; | |
897 | const char *slash; | |
898 | int ddescriptor; | |
899 | const char *prefix; | |
900 | size_t prefix_len; | |
901 | ||
902 | /* Resolve symlinks in FILENAME. Since FILENAME is fairly likely to | |
903 | be /proc/self/exe, symlinks are common. We don't try to resolve | |
904 | the whole path name, just the base name. */ | |
905 | ret = -1; | |
906 | alc = NULL; | |
907 | alc_len = 0; | |
908 | while (elf_is_symlink (filename)) | |
1a4d82fc | 909 | { |
94b46f34 XL |
910 | char *new_buf; |
911 | size_t new_len; | |
1a4d82fc | 912 | |
94b46f34 XL |
913 | new_buf = elf_readlink (state, filename, error_callback, data, &new_len); |
914 | if (new_buf == NULL) | |
915 | break; | |
1a4d82fc | 916 | |
94b46f34 XL |
917 | if (new_buf[0] == '/') |
918 | filename = new_buf; | |
919 | else | |
1a4d82fc | 920 | { |
94b46f34 XL |
921 | slash = strrchr (filename, '/'); |
922 | if (slash == NULL) | |
923 | filename = new_buf; | |
924 | else | |
925 | { | |
926 | size_t clen; | |
927 | char *c; | |
928 | ||
929 | slash++; | |
930 | clen = slash - filename + strlen (new_buf) + 1; | |
931 | c = backtrace_alloc (state, clen, error_callback, data); | |
932 | if (c == NULL) | |
933 | goto done; | |
934 | ||
935 | memcpy (c, filename, slash - filename); | |
936 | memcpy (c + (slash - filename), new_buf, strlen (new_buf)); | |
937 | c[slash - filename + strlen (new_buf)] = '\0'; | |
938 | backtrace_free (state, new_buf, new_len, error_callback, data); | |
939 | filename = c; | |
940 | new_buf = c; | |
941 | new_len = clen; | |
942 | } | |
1a4d82fc JJ |
943 | } |
944 | ||
94b46f34 XL |
945 | if (alc != NULL) |
946 | backtrace_free (state, alc, alc_len, error_callback, data); | |
947 | alc = new_buf; | |
948 | alc_len = new_len; | |
949 | } | |
1a4d82fc | 950 | |
94b46f34 XL |
951 | /* Look for DEBUGLINK_NAME in the same directory as FILENAME. */ |
952 | ||
953 | slash = strrchr (filename, '/'); | |
954 | if (slash == NULL) | |
955 | { | |
956 | prefix = ""; | |
957 | prefix_len = 0; | |
958 | } | |
959 | else | |
960 | { | |
961 | slash++; | |
962 | prefix = filename; | |
963 | prefix_len = slash - filename; | |
964 | } | |
965 | ||
966 | ddescriptor = elf_try_debugfile (state, prefix, prefix_len, "", 0, | |
967 | debuglink_name, error_callback, data); | |
968 | if (ddescriptor >= 0) | |
969 | { | |
970 | ret = ddescriptor; | |
971 | goto done; | |
972 | } | |
973 | ||
974 | /* Look for DEBUGLINK_NAME in a .debug subdirectory of FILENAME. */ | |
975 | ||
976 | ddescriptor = elf_try_debugfile (state, prefix, prefix_len, ".debug/", | |
977 | strlen (".debug/"), debuglink_name, | |
978 | error_callback, data); | |
979 | if (ddescriptor >= 0) | |
980 | { | |
981 | ret = ddescriptor; | |
982 | goto done; | |
983 | } | |
984 | ||
985 | /* Look for DEBUGLINK_NAME in /usr/lib/debug. */ | |
986 | ||
987 | ddescriptor = elf_try_debugfile (state, "/usr/lib/debug/", | |
988 | strlen ("/usr/lib/debug/"), prefix, | |
989 | prefix_len, debuglink_name, | |
990 | error_callback, data); | |
991 | if (ddescriptor >= 0) | |
992 | ret = ddescriptor; | |
993 | ||
994 | done: | |
995 | if (alc != NULL && alc_len > 0) | |
996 | backtrace_free (state, alc, alc_len, error_callback, data); | |
997 | return ret; | |
998 | } | |
999 | ||
1000 | /* Open a separate debug info file, using the debuglink section data | |
1001 | to find it. Returns an open file descriptor, or -1. */ | |
1002 | ||
1003 | static int | |
1004 | elf_open_debugfile_by_debuglink (struct backtrace_state *state, | |
1005 | const char *filename, | |
1006 | const char *debuglink_name, | |
1007 | uint32_t debuglink_crc, | |
1008 | backtrace_error_callback error_callback, | |
1009 | void *data) | |
1010 | { | |
1011 | int ddescriptor; | |
1012 | ||
1013 | ddescriptor = elf_find_debugfile_by_debuglink (state, filename, | |
1014 | debuglink_name, | |
1015 | error_callback, data); | |
1016 | if (ddescriptor < 0) | |
1017 | return -1; | |
1018 | ||
1019 | if (debuglink_crc != 0) | |
1020 | { | |
1021 | uint32_t got_crc; | |
1022 | ||
1023 | got_crc = elf_crc32_file (state, ddescriptor, error_callback, data); | |
1024 | if (got_crc != debuglink_crc) | |
1025 | { | |
1026 | backtrace_close (ddescriptor, error_callback, data); | |
1027 | return -1; | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | return ddescriptor; | |
1032 | } | |
1033 | ||
1034 | /* A function useful for setting a breakpoint for an inflation failure | |
1035 | when this code is compiled with -g. */ | |
1036 | ||
1037 | static void | |
1038 | elf_zlib_failed(void) | |
1039 | { | |
1040 | } | |
1041 | ||
1042 | /* *PVAL is the current value being read from the stream, and *PBITS | |
1043 | is the number of valid bits. Ensure that *PVAL holds at least 15 | |
1044 | bits by reading additional bits from *PPIN, up to PINEND, as | |
1045 | needed. Updates *PPIN, *PVAL and *PBITS. Returns 1 on success, 0 | |
1046 | on error. */ | |
1047 | ||
1048 | static int | |
1049 | elf_zlib_fetch (const unsigned char **ppin, const unsigned char *pinend, | |
1050 | uint64_t *pval, unsigned int *pbits) | |
1051 | { | |
1052 | unsigned int bits; | |
1053 | const unsigned char *pin; | |
1054 | uint64_t val; | |
1055 | uint32_t next; | |
1056 | ||
1057 | bits = *pbits; | |
1058 | if (bits >= 15) | |
1059 | return 1; | |
1060 | pin = *ppin; | |
1061 | val = *pval; | |
1062 | ||
1063 | if (unlikely (pinend - pin < 4)) | |
1064 | { | |
1065 | elf_zlib_failed (); | |
1066 | return 0; | |
1067 | } | |
1068 | ||
1069 | #if defined(__BYTE_ORDER__) && defined(__ORDER_LITTLE_ENDIAN__) \ | |
1070 | && defined(__ORDER_BIG_ENDIAN__) \ | |
1071 | && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ \ | |
1072 | || __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) | |
1073 | /* We've ensured that PIN is aligned. */ | |
1074 | next = *(const uint32_t *)pin; | |
1075 | ||
1076 | #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__ | |
1077 | next = __builtin_bswap32 (next); | |
1078 | #endif | |
1079 | #else | |
1080 | next = pin[0] | (pin[1] << 8) | (pin[2] << 16) | (pin[3] << 24); | |
1081 | #endif | |
1082 | ||
1083 | val |= (uint64_t)next << bits; | |
1084 | bits += 32; | |
1085 | pin += 4; | |
1086 | ||
1087 | /* We will need the next four bytes soon. */ | |
1088 | __builtin_prefetch (pin, 0, 0); | |
1089 | ||
1090 | *ppin = pin; | |
1091 | *pval = val; | |
1092 | *pbits = bits; | |
1093 | return 1; | |
1094 | } | |
1095 | ||
1096 | /* Huffman code tables, like the rest of the zlib format, are defined | |
1097 | by RFC 1951. We store a Huffman code table as a series of tables | |
1098 | stored sequentially in memory. Each entry in a table is 16 bits. | |
1099 | The first, main, table has 256 entries. It is followed by a set of | |
1100 | secondary tables of length 2 to 128 entries. The maximum length of | |
1101 | a code sequence in the deflate format is 15 bits, so that is all we | |
1102 | need. Each secondary table has an index, which is the offset of | |
1103 | the table in the overall memory storage. | |
1104 | ||
1105 | The deflate format says that all codes of a given bit length are | |
1106 | lexicographically consecutive. Perhaps we could have 130 values | |
1107 | that require a 15-bit code, perhaps requiring three secondary | |
1108 | tables of size 128. I don't know if this is actually possible, but | |
1109 | it suggests that the maximum size required for secondary tables is | |
1110 | 3 * 128 + 3 * 64 ... == 768. The zlib enough program reports 660 | |
1111 | as the maximum. We permit 768, since in addition to the 256 for | |
1112 | the primary table, with two bytes per entry, and with the two | |
1113 | tables we need, that gives us a page. | |
1114 | ||
1115 | A single table entry needs to store a value or (for the main table | |
1116 | only) the index and size of a secondary table. Values range from 0 | |
1117 | to 285, inclusive. Secondary table indexes, per above, range from | |
1118 | 0 to 510. For a value we need to store the number of bits we need | |
1119 | to determine that value (one value may appear multiple times in the | |
1120 | table), which is 1 to 8. For a secondary table we need to store | |
1121 | the number of bits used to index into the table, which is 1 to 7. | |
1122 | And of course we need 1 bit to decide whether we have a value or a | |
1123 | secondary table index. So each entry needs 9 bits for value/table | |
1124 | index, 3 bits for size, 1 bit what it is. For simplicity we use 16 | |
1125 | bits per entry. */ | |
1126 | ||
1127 | /* Number of entries we allocate to for one code table. We get a page | |
1128 | for the two code tables we need. */ | |
1129 | ||
1130 | #define HUFFMAN_TABLE_SIZE (1024) | |
1131 | ||
1132 | /* Bit masks and shifts for the values in the table. */ | |
1133 | ||
1134 | #define HUFFMAN_VALUE_MASK 0x01ff | |
1135 | #define HUFFMAN_BITS_SHIFT 9 | |
1136 | #define HUFFMAN_BITS_MASK 0x7 | |
1137 | #define HUFFMAN_SECONDARY_SHIFT 12 | |
1138 | ||
1139 | /* For working memory while inflating we need two code tables, we need | |
1140 | an array of code lengths (max value 15, so we use unsigned char), | |
1141 | and an array of unsigned shorts used while building a table. The | |
1142 | latter two arrays must be large enough to hold the maximum number | |
1143 | of code lengths, which RFC 1951 defines as 286 + 30. */ | |
1144 | ||
1145 | #define ZDEBUG_TABLE_SIZE \ | |
1146 | (2 * HUFFMAN_TABLE_SIZE * sizeof (uint16_t) \ | |
1147 | + (286 + 30) * sizeof (uint16_t) \ | |
1148 | + (286 + 30) * sizeof (unsigned char)) | |
1149 | ||
1150 | #define ZDEBUG_TABLE_CODELEN_OFFSET \ | |
1151 | (2 * HUFFMAN_TABLE_SIZE * sizeof (uint16_t) \ | |
1152 | + (286 + 30) * sizeof (uint16_t)) | |
1153 | ||
1154 | #define ZDEBUG_TABLE_WORK_OFFSET \ | |
1155 | (2 * HUFFMAN_TABLE_SIZE * sizeof (uint16_t)) | |
1156 | ||
1157 | #ifdef BACKTRACE_GENERATE_FIXED_HUFFMAN_TABLE | |
1158 | ||
1159 | /* Used by the main function that generates the fixed table to learn | |
1160 | the table size. */ | |
1161 | static size_t final_next_secondary; | |
1162 | ||
1163 | #endif | |
1164 | ||
1165 | /* Build a Huffman code table from an array of lengths in CODES of | |
1166 | length CODES_LEN. The table is stored into *TABLE. ZDEBUG_TABLE | |
1167 | is the same as for elf_zlib_inflate, used to find some work space. | |
1168 | Returns 1 on success, 0 on error. */ | |
1169 | ||
1170 | static int | |
1171 | elf_zlib_inflate_table (unsigned char *codes, size_t codes_len, | |
1172 | uint16_t *zdebug_table, uint16_t *table) | |
1173 | { | |
1174 | uint16_t count[16]; | |
1175 | uint16_t start[16]; | |
1176 | uint16_t prev[16]; | |
1177 | uint16_t firstcode[7]; | |
1178 | uint16_t *next; | |
1179 | size_t i; | |
1180 | size_t j; | |
1181 | unsigned int code; | |
1182 | size_t next_secondary; | |
1183 | ||
1184 | /* Count the number of code of each length. Set NEXT[val] to be the | |
1185 | next value after VAL with the same bit length. */ | |
1186 | ||
1187 | next = (uint16_t *) (((unsigned char *) zdebug_table) | |
1188 | + ZDEBUG_TABLE_WORK_OFFSET); | |
1189 | ||
1190 | memset (&count[0], 0, 16 * sizeof (uint16_t)); | |
1191 | for (i = 0; i < codes_len; ++i) | |
1192 | { | |
1193 | if (unlikely (codes[i] >= 16)) | |
1194 | { | |
1195 | elf_zlib_failed (); | |
1196 | return 0; | |
1197 | } | |
1198 | ||
1199 | if (count[codes[i]] == 0) | |
1200 | { | |
1201 | start[codes[i]] = i; | |
1202 | prev[codes[i]] = i; | |
1203 | } | |
1204 | else | |
1205 | { | |
1206 | next[prev[codes[i]]] = i; | |
1207 | prev[codes[i]] = i; | |
1208 | } | |
1209 | ||
1210 | ++count[codes[i]]; | |
1211 | } | |
1212 | ||
1213 | /* For each length, fill in the table for the codes of that | |
1214 | length. */ | |
1215 | ||
1216 | memset (table, 0, HUFFMAN_TABLE_SIZE * sizeof (uint16_t)); | |
1217 | ||
1218 | /* Handle the values that do not require a secondary table. */ | |
1219 | ||
1220 | code = 0; | |
1221 | for (j = 1; j <= 8; ++j) | |
1222 | { | |
1223 | unsigned int jcnt; | |
1224 | unsigned int val; | |
1225 | ||
1226 | jcnt = count[j]; | |
1227 | if (jcnt == 0) | |
1228 | continue; | |
1229 | ||
1230 | if (unlikely (jcnt > (1U << j))) | |
1231 | { | |
1232 | elf_zlib_failed (); | |
1233 | return 0; | |
1234 | } | |
1235 | ||
1236 | /* There are JCNT values that have this length, the values | |
1237 | starting from START[j] continuing through NEXT[VAL]. Those | |
1238 | values are assigned consecutive values starting at CODE. */ | |
1239 | ||
1240 | val = start[j]; | |
1241 | for (i = 0; i < jcnt; ++i) | |
1242 | { | |
1243 | uint16_t tval; | |
1244 | size_t ind; | |
1245 | unsigned int incr; | |
1246 | ||
1247 | /* In the compressed bit stream, the value VAL is encoded as | |
1248 | J bits with the value C. */ | |
1249 | ||
1250 | if (unlikely ((val & ~HUFFMAN_VALUE_MASK) != 0)) | |
1251 | { | |
1252 | elf_zlib_failed (); | |
1253 | return 0; | |
1254 | } | |
1255 | ||
1256 | tval = val | ((j - 1) << HUFFMAN_BITS_SHIFT); | |
1257 | ||
1258 | /* The table lookup uses 8 bits. If J is less than 8, we | |
1259 | don't know what the other bits will be. We need to fill | |
1260 | in all possibilities in the table. Since the Huffman | |
1261 | code is unambiguous, those entries can't be used for any | |
1262 | other code. */ | |
1263 | ||
1264 | for (ind = code; ind < 0x100; ind += 1 << j) | |
1265 | { | |
1266 | if (unlikely (table[ind] != 0)) | |
1267 | { | |
1268 | elf_zlib_failed (); | |
1269 | return 0; | |
1270 | } | |
1271 | table[ind] = tval; | |
1272 | } | |
1273 | ||
1274 | /* Advance to the next value with this length. */ | |
1275 | if (i + 1 < jcnt) | |
1276 | val = next[val]; | |
1277 | ||
1278 | /* The Huffman codes are stored in the bitstream with the | |
1279 | most significant bit first, as is required to make them | |
1280 | unambiguous. The effect is that when we read them from | |
1281 | the bitstream we see the bit sequence in reverse order: | |
1282 | the most significant bit of the Huffman code is the least | |
1283 | significant bit of the value we read from the bitstream. | |
1284 | That means that to make our table lookups work, we need | |
1285 | to reverse the bits of CODE. Since reversing bits is | |
1286 | tedious and in general requires using a table, we instead | |
1287 | increment CODE in reverse order. That is, if the number | |
1288 | of bits we are currently using, here named J, is 3, we | |
1289 | count as 000, 100, 010, 110, 001, 101, 011, 111, which is | |
1290 | to say the numbers from 0 to 7 but with the bits | |
1291 | reversed. Going to more bits, aka incrementing J, | |
1292 | effectively just adds more zero bits as the beginning, | |
1293 | and as such does not change the numeric value of CODE. | |
1294 | ||
1295 | To increment CODE of length J in reverse order, find the | |
1296 | most significant zero bit and set it to one while | |
1297 | clearing all higher bits. In other words, add 1 modulo | |
1298 | 2^J, only reversed. */ | |
1299 | ||
1300 | incr = 1U << (j - 1); | |
1301 | while ((code & incr) != 0) | |
1302 | incr >>= 1; | |
1303 | if (incr == 0) | |
1304 | code = 0; | |
1305 | else | |
1306 | { | |
1307 | code &= incr - 1; | |
1308 | code += incr; | |
1309 | } | |
1310 | } | |
1311 | } | |
1312 | ||
1313 | /* Handle the values that require a secondary table. */ | |
1314 | ||
1315 | /* Set FIRSTCODE, the number at which the codes start, for each | |
1316 | length. */ | |
1317 | ||
1318 | for (j = 9; j < 16; j++) | |
1319 | { | |
1320 | unsigned int jcnt; | |
1321 | unsigned int k; | |
1322 | ||
1323 | jcnt = count[j]; | |
1324 | if (jcnt == 0) | |
1325 | continue; | |
1326 | ||
1327 | /* There are JCNT values that have this length, the values | |
1328 | starting from START[j]. Those values are assigned | |
1329 | consecutive values starting at CODE. */ | |
1330 | ||
1331 | firstcode[j - 9] = code; | |
1332 | ||
1333 | /* Reverse add JCNT to CODE modulo 2^J. */ | |
1334 | for (k = 0; k < j; ++k) | |
1335 | { | |
1336 | if ((jcnt & (1U << k)) != 0) | |
1337 | { | |
1338 | unsigned int m; | |
1339 | unsigned int bit; | |
1340 | ||
1341 | bit = 1U << (j - k - 1); | |
1342 | for (m = 0; m < j - k; ++m, bit >>= 1) | |
1343 | { | |
1344 | if ((code & bit) == 0) | |
1345 | { | |
1346 | code += bit; | |
1347 | break; | |
1348 | } | |
1349 | code &= ~bit; | |
1350 | } | |
1351 | jcnt &= ~(1U << k); | |
1352 | } | |
1353 | } | |
1354 | if (unlikely (jcnt != 0)) | |
1355 | { | |
1356 | elf_zlib_failed (); | |
1357 | return 0; | |
1358 | } | |
1359 | } | |
1360 | ||
1361 | /* For J from 9 to 15, inclusive, we store COUNT[J] consecutive | |
1362 | values starting at START[J] with consecutive codes starting at | |
1363 | FIRSTCODE[J - 9]. In the primary table we need to point to the | |
1364 | secondary table, and the secondary table will be indexed by J - 9 | |
1365 | bits. We count down from 15 so that we install the larger | |
1366 | secondary tables first, as the smaller ones may be embedded in | |
1367 | the larger ones. */ | |
1368 | ||
1369 | next_secondary = 0; /* Index of next secondary table (after primary). */ | |
1370 | for (j = 15; j >= 9; j--) | |
1371 | { | |
1372 | unsigned int jcnt; | |
1373 | unsigned int val; | |
1374 | size_t primary; /* Current primary index. */ | |
1375 | size_t secondary; /* Offset to current secondary table. */ | |
1376 | size_t secondary_bits; /* Bit size of current secondary table. */ | |
1377 | ||
1378 | jcnt = count[j]; | |
1379 | if (jcnt == 0) | |
1380 | continue; | |
1381 | ||
1382 | val = start[j]; | |
1383 | code = firstcode[j - 9]; | |
1384 | primary = 0x100; | |
1385 | secondary = 0; | |
1386 | secondary_bits = 0; | |
1387 | for (i = 0; i < jcnt; ++i) | |
1388 | { | |
1389 | uint16_t tval; | |
1390 | size_t ind; | |
1391 | unsigned int incr; | |
1392 | ||
1393 | if ((code & 0xff) != primary) | |
1394 | { | |
1395 | uint16_t tprimary; | |
1396 | ||
1397 | /* Fill in a new primary table entry. */ | |
1398 | ||
1399 | primary = code & 0xff; | |
1400 | ||
1401 | tprimary = table[primary]; | |
1402 | if (tprimary == 0) | |
1403 | { | |
1404 | /* Start a new secondary table. */ | |
1405 | ||
1406 | if (unlikely ((next_secondary & HUFFMAN_VALUE_MASK) | |
1407 | != next_secondary)) | |
1408 | { | |
1409 | elf_zlib_failed (); | |
1410 | return 0; | |
1411 | } | |
1412 | ||
1413 | secondary = next_secondary; | |
1414 | secondary_bits = j - 8; | |
1415 | next_secondary += 1 << secondary_bits; | |
1416 | table[primary] = (secondary | |
1417 | + ((j - 8) << HUFFMAN_BITS_SHIFT) | |
1418 | + (1U << HUFFMAN_SECONDARY_SHIFT)); | |
1419 | } | |
1420 | else | |
1421 | { | |
1422 | /* There is an existing entry. It had better be a | |
1423 | secondary table with enough bits. */ | |
1424 | if (unlikely ((tprimary & (1U << HUFFMAN_SECONDARY_SHIFT)) | |
1425 | == 0)) | |
1426 | { | |
1427 | elf_zlib_failed (); | |
1428 | return 0; | |
1429 | } | |
1430 | secondary = tprimary & HUFFMAN_VALUE_MASK; | |
1431 | secondary_bits = ((tprimary >> HUFFMAN_BITS_SHIFT) | |
1432 | & HUFFMAN_BITS_MASK); | |
1433 | if (unlikely (secondary_bits < j - 8)) | |
1434 | { | |
1435 | elf_zlib_failed (); | |
1436 | return 0; | |
1437 | } | |
1438 | } | |
1439 | } | |
1440 | ||
1441 | /* Fill in secondary table entries. */ | |
1442 | ||
1443 | tval = val | ((j - 8) << HUFFMAN_BITS_SHIFT); | |
1444 | ||
1445 | for (ind = code >> 8; | |
1446 | ind < (1U << secondary_bits); | |
1447 | ind += 1U << (j - 8)) | |
1448 | { | |
1449 | if (unlikely (table[secondary + 0x100 + ind] != 0)) | |
1450 | { | |
1451 | elf_zlib_failed (); | |
1452 | return 0; | |
1453 | } | |
1454 | table[secondary + 0x100 + ind] = tval; | |
1455 | } | |
1456 | ||
1457 | if (i + 1 < jcnt) | |
1458 | val = next[val]; | |
1459 | ||
1460 | incr = 1U << (j - 1); | |
1461 | while ((code & incr) != 0) | |
1462 | incr >>= 1; | |
1463 | if (incr == 0) | |
1464 | code = 0; | |
1465 | else | |
1466 | { | |
1467 | code &= incr - 1; | |
1468 | code += incr; | |
1469 | } | |
1470 | } | |
1471 | } | |
1472 | ||
1473 | #ifdef BACKTRACE_GENERATE_FIXED_HUFFMAN_TABLE | |
1474 | final_next_secondary = next_secondary; | |
1475 | #endif | |
1476 | ||
1477 | return 1; | |
1478 | } | |
1479 | ||
1480 | #ifdef BACKTRACE_GENERATE_FIXED_HUFFMAN_TABLE | |
1481 | ||
1482 | /* Used to generate the fixed Huffman table for block type 1. */ | |
1483 | ||
1484 | #include <stdio.h> | |
1485 | ||
1486 | static uint16_t table[ZDEBUG_TABLE_SIZE]; | |
1487 | static unsigned char codes[288]; | |
1488 | ||
1489 | int | |
1490 | main () | |
1491 | { | |
1492 | size_t i; | |
1493 | ||
1494 | for (i = 0; i <= 143; ++i) | |
1495 | codes[i] = 8; | |
1496 | for (i = 144; i <= 255; ++i) | |
1497 | codes[i] = 9; | |
1498 | for (i = 256; i <= 279; ++i) | |
1499 | codes[i] = 7; | |
1500 | for (i = 280; i <= 287; ++i) | |
1501 | codes[i] = 8; | |
1502 | if (!elf_zlib_inflate_table (&codes[0], 288, &table[0], &table[0])) | |
1503 | { | |
1504 | fprintf (stderr, "elf_zlib_inflate_table failed\n"); | |
1505 | exit (EXIT_FAILURE); | |
1506 | } | |
1507 | ||
1508 | printf ("static const uint16_t elf_zlib_default_table[%#zx] =\n", | |
1509 | final_next_secondary + 0x100); | |
1510 | printf ("{\n"); | |
1511 | for (i = 0; i < final_next_secondary + 0x100; i += 8) | |
1512 | { | |
1513 | size_t j; | |
1514 | ||
1515 | printf (" "); | |
1516 | for (j = i; j < final_next_secondary + 0x100 && j < i + 8; ++j) | |
1517 | printf (" %#x,", table[j]); | |
1518 | printf ("\n"); | |
1519 | } | |
1520 | printf ("};\n"); | |
1521 | printf ("\n"); | |
1522 | ||
1523 | for (i = 0; i < 32; ++i) | |
1524 | codes[i] = 5; | |
1525 | if (!elf_zlib_inflate_table (&codes[0], 32, &table[0], &table[0])) | |
1526 | { | |
1527 | fprintf (stderr, "elf_zlib_inflate_table failed\n"); | |
1528 | exit (EXIT_FAILURE); | |
1529 | } | |
1530 | ||
1531 | printf ("static const uint16_t elf_zlib_default_dist_table[%#zx] =\n", | |
1532 | final_next_secondary + 0x100); | |
1533 | printf ("{\n"); | |
1534 | for (i = 0; i < final_next_secondary + 0x100; i += 8) | |
1535 | { | |
1536 | size_t j; | |
1537 | ||
1538 | printf (" "); | |
1539 | for (j = i; j < final_next_secondary + 0x100 && j < i + 8; ++j) | |
1540 | printf (" %#x,", table[j]); | |
1541 | printf ("\n"); | |
1542 | } | |
1543 | printf ("};\n"); | |
1544 | ||
1545 | return 0; | |
1546 | } | |
1547 | ||
1548 | #endif | |
1549 | ||
1550 | /* The fixed tables generated by the #ifdef'ed out main function | |
1551 | above. */ | |
1552 | ||
1553 | static const uint16_t elf_zlib_default_table[0x170] = | |
1554 | { | |
1555 | 0xd00, 0xe50, 0xe10, 0xf18, 0xd10, 0xe70, 0xe30, 0x1230, | |
1556 | 0xd08, 0xe60, 0xe20, 0x1210, 0xe00, 0xe80, 0xe40, 0x1250, | |
1557 | 0xd04, 0xe58, 0xe18, 0x1200, 0xd14, 0xe78, 0xe38, 0x1240, | |
1558 | 0xd0c, 0xe68, 0xe28, 0x1220, 0xe08, 0xe88, 0xe48, 0x1260, | |
1559 | 0xd02, 0xe54, 0xe14, 0xf1c, 0xd12, 0xe74, 0xe34, 0x1238, | |
1560 | 0xd0a, 0xe64, 0xe24, 0x1218, 0xe04, 0xe84, 0xe44, 0x1258, | |
1561 | 0xd06, 0xe5c, 0xe1c, 0x1208, 0xd16, 0xe7c, 0xe3c, 0x1248, | |
1562 | 0xd0e, 0xe6c, 0xe2c, 0x1228, 0xe0c, 0xe8c, 0xe4c, 0x1268, | |
1563 | 0xd01, 0xe52, 0xe12, 0xf1a, 0xd11, 0xe72, 0xe32, 0x1234, | |
1564 | 0xd09, 0xe62, 0xe22, 0x1214, 0xe02, 0xe82, 0xe42, 0x1254, | |
1565 | 0xd05, 0xe5a, 0xe1a, 0x1204, 0xd15, 0xe7a, 0xe3a, 0x1244, | |
1566 | 0xd0d, 0xe6a, 0xe2a, 0x1224, 0xe0a, 0xe8a, 0xe4a, 0x1264, | |
1567 | 0xd03, 0xe56, 0xe16, 0xf1e, 0xd13, 0xe76, 0xe36, 0x123c, | |
1568 | 0xd0b, 0xe66, 0xe26, 0x121c, 0xe06, 0xe86, 0xe46, 0x125c, | |
1569 | 0xd07, 0xe5e, 0xe1e, 0x120c, 0xd17, 0xe7e, 0xe3e, 0x124c, | |
1570 | 0xd0f, 0xe6e, 0xe2e, 0x122c, 0xe0e, 0xe8e, 0xe4e, 0x126c, | |
1571 | 0xd00, 0xe51, 0xe11, 0xf19, 0xd10, 0xe71, 0xe31, 0x1232, | |
1572 | 0xd08, 0xe61, 0xe21, 0x1212, 0xe01, 0xe81, 0xe41, 0x1252, | |
1573 | 0xd04, 0xe59, 0xe19, 0x1202, 0xd14, 0xe79, 0xe39, 0x1242, | |
1574 | 0xd0c, 0xe69, 0xe29, 0x1222, 0xe09, 0xe89, 0xe49, 0x1262, | |
1575 | 0xd02, 0xe55, 0xe15, 0xf1d, 0xd12, 0xe75, 0xe35, 0x123a, | |
1576 | 0xd0a, 0xe65, 0xe25, 0x121a, 0xe05, 0xe85, 0xe45, 0x125a, | |
1577 | 0xd06, 0xe5d, 0xe1d, 0x120a, 0xd16, 0xe7d, 0xe3d, 0x124a, | |
1578 | 0xd0e, 0xe6d, 0xe2d, 0x122a, 0xe0d, 0xe8d, 0xe4d, 0x126a, | |
1579 | 0xd01, 0xe53, 0xe13, 0xf1b, 0xd11, 0xe73, 0xe33, 0x1236, | |
1580 | 0xd09, 0xe63, 0xe23, 0x1216, 0xe03, 0xe83, 0xe43, 0x1256, | |
1581 | 0xd05, 0xe5b, 0xe1b, 0x1206, 0xd15, 0xe7b, 0xe3b, 0x1246, | |
1582 | 0xd0d, 0xe6b, 0xe2b, 0x1226, 0xe0b, 0xe8b, 0xe4b, 0x1266, | |
1583 | 0xd03, 0xe57, 0xe17, 0xf1f, 0xd13, 0xe77, 0xe37, 0x123e, | |
1584 | 0xd0b, 0xe67, 0xe27, 0x121e, 0xe07, 0xe87, 0xe47, 0x125e, | |
1585 | 0xd07, 0xe5f, 0xe1f, 0x120e, 0xd17, 0xe7f, 0xe3f, 0x124e, | |
1586 | 0xd0f, 0xe6f, 0xe2f, 0x122e, 0xe0f, 0xe8f, 0xe4f, 0x126e, | |
1587 | 0x290, 0x291, 0x292, 0x293, 0x294, 0x295, 0x296, 0x297, | |
1588 | 0x298, 0x299, 0x29a, 0x29b, 0x29c, 0x29d, 0x29e, 0x29f, | |
1589 | 0x2a0, 0x2a1, 0x2a2, 0x2a3, 0x2a4, 0x2a5, 0x2a6, 0x2a7, | |
1590 | 0x2a8, 0x2a9, 0x2aa, 0x2ab, 0x2ac, 0x2ad, 0x2ae, 0x2af, | |
1591 | 0x2b0, 0x2b1, 0x2b2, 0x2b3, 0x2b4, 0x2b5, 0x2b6, 0x2b7, | |
1592 | 0x2b8, 0x2b9, 0x2ba, 0x2bb, 0x2bc, 0x2bd, 0x2be, 0x2bf, | |
1593 | 0x2c0, 0x2c1, 0x2c2, 0x2c3, 0x2c4, 0x2c5, 0x2c6, 0x2c7, | |
1594 | 0x2c8, 0x2c9, 0x2ca, 0x2cb, 0x2cc, 0x2cd, 0x2ce, 0x2cf, | |
1595 | 0x2d0, 0x2d1, 0x2d2, 0x2d3, 0x2d4, 0x2d5, 0x2d6, 0x2d7, | |
1596 | 0x2d8, 0x2d9, 0x2da, 0x2db, 0x2dc, 0x2dd, 0x2de, 0x2df, | |
1597 | 0x2e0, 0x2e1, 0x2e2, 0x2e3, 0x2e4, 0x2e5, 0x2e6, 0x2e7, | |
1598 | 0x2e8, 0x2e9, 0x2ea, 0x2eb, 0x2ec, 0x2ed, 0x2ee, 0x2ef, | |
1599 | 0x2f0, 0x2f1, 0x2f2, 0x2f3, 0x2f4, 0x2f5, 0x2f6, 0x2f7, | |
1600 | 0x2f8, 0x2f9, 0x2fa, 0x2fb, 0x2fc, 0x2fd, 0x2fe, 0x2ff, | |
1601 | }; | |
1602 | ||
1603 | static const uint16_t elf_zlib_default_dist_table[0x100] = | |
1604 | { | |
1605 | 0x800, 0x810, 0x808, 0x818, 0x804, 0x814, 0x80c, 0x81c, | |
1606 | 0x802, 0x812, 0x80a, 0x81a, 0x806, 0x816, 0x80e, 0x81e, | |
1607 | 0x801, 0x811, 0x809, 0x819, 0x805, 0x815, 0x80d, 0x81d, | |
1608 | 0x803, 0x813, 0x80b, 0x81b, 0x807, 0x817, 0x80f, 0x81f, | |
1609 | 0x800, 0x810, 0x808, 0x818, 0x804, 0x814, 0x80c, 0x81c, | |
1610 | 0x802, 0x812, 0x80a, 0x81a, 0x806, 0x816, 0x80e, 0x81e, | |
1611 | 0x801, 0x811, 0x809, 0x819, 0x805, 0x815, 0x80d, 0x81d, | |
1612 | 0x803, 0x813, 0x80b, 0x81b, 0x807, 0x817, 0x80f, 0x81f, | |
1613 | 0x800, 0x810, 0x808, 0x818, 0x804, 0x814, 0x80c, 0x81c, | |
1614 | 0x802, 0x812, 0x80a, 0x81a, 0x806, 0x816, 0x80e, 0x81e, | |
1615 | 0x801, 0x811, 0x809, 0x819, 0x805, 0x815, 0x80d, 0x81d, | |
1616 | 0x803, 0x813, 0x80b, 0x81b, 0x807, 0x817, 0x80f, 0x81f, | |
1617 | 0x800, 0x810, 0x808, 0x818, 0x804, 0x814, 0x80c, 0x81c, | |
1618 | 0x802, 0x812, 0x80a, 0x81a, 0x806, 0x816, 0x80e, 0x81e, | |
1619 | 0x801, 0x811, 0x809, 0x819, 0x805, 0x815, 0x80d, 0x81d, | |
1620 | 0x803, 0x813, 0x80b, 0x81b, 0x807, 0x817, 0x80f, 0x81f, | |
1621 | 0x800, 0x810, 0x808, 0x818, 0x804, 0x814, 0x80c, 0x81c, | |
1622 | 0x802, 0x812, 0x80a, 0x81a, 0x806, 0x816, 0x80e, 0x81e, | |
1623 | 0x801, 0x811, 0x809, 0x819, 0x805, 0x815, 0x80d, 0x81d, | |
1624 | 0x803, 0x813, 0x80b, 0x81b, 0x807, 0x817, 0x80f, 0x81f, | |
1625 | 0x800, 0x810, 0x808, 0x818, 0x804, 0x814, 0x80c, 0x81c, | |
1626 | 0x802, 0x812, 0x80a, 0x81a, 0x806, 0x816, 0x80e, 0x81e, | |
1627 | 0x801, 0x811, 0x809, 0x819, 0x805, 0x815, 0x80d, 0x81d, | |
1628 | 0x803, 0x813, 0x80b, 0x81b, 0x807, 0x817, 0x80f, 0x81f, | |
1629 | 0x800, 0x810, 0x808, 0x818, 0x804, 0x814, 0x80c, 0x81c, | |
1630 | 0x802, 0x812, 0x80a, 0x81a, 0x806, 0x816, 0x80e, 0x81e, | |
1631 | 0x801, 0x811, 0x809, 0x819, 0x805, 0x815, 0x80d, 0x81d, | |
1632 | 0x803, 0x813, 0x80b, 0x81b, 0x807, 0x817, 0x80f, 0x81f, | |
1633 | 0x800, 0x810, 0x808, 0x818, 0x804, 0x814, 0x80c, 0x81c, | |
1634 | 0x802, 0x812, 0x80a, 0x81a, 0x806, 0x816, 0x80e, 0x81e, | |
1635 | 0x801, 0x811, 0x809, 0x819, 0x805, 0x815, 0x80d, 0x81d, | |
1636 | 0x803, 0x813, 0x80b, 0x81b, 0x807, 0x817, 0x80f, 0x81f, | |
1637 | }; | |
1638 | ||
1639 | /* Inflate a zlib stream from PIN/SIN to POUT/SOUT. Return 1 on | |
1640 | success, 0 on some error parsing the stream. */ | |
1641 | ||
1642 | static int | |
1643 | elf_zlib_inflate (const unsigned char *pin, size_t sin, uint16_t *zdebug_table, | |
1644 | unsigned char *pout, size_t sout) | |
1645 | { | |
1646 | unsigned char *porigout; | |
1647 | const unsigned char *pinend; | |
1648 | unsigned char *poutend; | |
1649 | ||
1650 | /* We can apparently see multiple zlib streams concatenated | |
1651 | together, so keep going as long as there is something to read. | |
1652 | The last 4 bytes are the checksum. */ | |
1653 | porigout = pout; | |
1654 | pinend = pin + sin; | |
1655 | poutend = pout + sout; | |
1656 | while ((pinend - pin) > 4) | |
1657 | { | |
1658 | uint64_t val; | |
1659 | unsigned int bits; | |
1660 | int last; | |
1661 | ||
1662 | /* Read the two byte zlib header. */ | |
1663 | ||
1664 | if (unlikely ((pin[0] & 0xf) != 8)) /* 8 is zlib encoding. */ | |
1665 | { | |
1666 | /* Unknown compression method. */ | |
1667 | elf_zlib_failed (); | |
1668 | return 0; | |
1669 | } | |
1670 | if (unlikely ((pin[0] >> 4) > 7)) | |
1671 | { | |
1672 | /* Window size too large. Other than this check, we don't | |
1673 | care about the window size. */ | |
1674 | elf_zlib_failed (); | |
1675 | return 0; | |
1676 | } | |
1677 | if (unlikely ((pin[1] & 0x20) != 0)) | |
1678 | { | |
1679 | /* Stream expects a predefined dictionary, but we have no | |
1680 | dictionary. */ | |
1681 | elf_zlib_failed (); | |
1682 | return 0; | |
1683 | } | |
1684 | val = (pin[0] << 8) | pin[1]; | |
1685 | if (unlikely (val % 31 != 0)) | |
1686 | { | |
1687 | /* Header check failure. */ | |
1688 | elf_zlib_failed (); | |
1689 | return 0; | |
1690 | } | |
1691 | pin += 2; | |
1692 | ||
1693 | /* Align PIN to a 32-bit boundary. */ | |
1694 | ||
1695 | val = 0; | |
1696 | bits = 0; | |
1697 | while ((((uintptr_t) pin) & 3) != 0) | |
1698 | { | |
1699 | val |= (uint64_t)*pin << bits; | |
1700 | bits += 8; | |
1701 | ++pin; | |
1702 | } | |
1703 | ||
1704 | /* Read blocks until one is marked last. */ | |
1705 | ||
1706 | last = 0; | |
1707 | ||
1708 | while (!last) | |
1709 | { | |
1710 | unsigned int type; | |
1711 | const uint16_t *tlit; | |
1712 | const uint16_t *tdist; | |
1713 | ||
1714 | if (!elf_zlib_fetch (&pin, pinend, &val, &bits)) | |
1715 | return 0; | |
1716 | ||
1717 | last = val & 1; | |
1718 | type = (val >> 1) & 3; | |
1719 | val >>= 3; | |
1720 | bits -= 3; | |
1721 | ||
1722 | if (unlikely (type == 3)) | |
1723 | { | |
1724 | /* Invalid block type. */ | |
1725 | elf_zlib_failed (); | |
1726 | return 0; | |
1727 | } | |
1728 | ||
1729 | if (type == 0) | |
1730 | { | |
1731 | uint16_t len; | |
1732 | uint16_t lenc; | |
1733 | ||
1734 | /* An uncompressed block. */ | |
1735 | ||
1736 | /* If we've read ahead more than a byte, back up. */ | |
1737 | while (bits > 8) | |
1738 | { | |
1739 | --pin; | |
1740 | bits -= 8; | |
1741 | } | |
1742 | ||
1743 | val = 0; | |
1744 | bits = 0; | |
1745 | if (unlikely ((pinend - pin) < 4)) | |
1746 | { | |
1747 | /* Missing length. */ | |
1748 | elf_zlib_failed (); | |
1749 | return 0; | |
1750 | } | |
1751 | len = pin[0] | (pin[1] << 8); | |
1752 | lenc = pin[2] | (pin[3] << 8); | |
1753 | pin += 4; | |
1754 | lenc = ~lenc; | |
1755 | if (unlikely (len != lenc)) | |
1756 | { | |
1757 | /* Corrupt data. */ | |
1758 | elf_zlib_failed (); | |
1759 | return 0; | |
1760 | } | |
1761 | if (unlikely (len > (unsigned int) (pinend - pin) | |
1762 | || len > (unsigned int) (poutend - pout))) | |
1763 | { | |
1764 | /* Not enough space in buffers. */ | |
1765 | elf_zlib_failed (); | |
1766 | return 0; | |
1767 | } | |
1768 | memcpy (pout, pin, len); | |
1769 | pout += len; | |
1770 | pin += len; | |
1771 | ||
1772 | /* Align PIN. */ | |
1773 | while ((((uintptr_t) pin) & 3) != 0) | |
1774 | { | |
1775 | val |= (uint64_t)*pin << bits; | |
1776 | bits += 8; | |
1777 | ++pin; | |
1778 | } | |
1779 | ||
1780 | /* Go around to read the next block. */ | |
1781 | continue; | |
1782 | } | |
1783 | ||
1784 | if (type == 1) | |
1785 | { | |
1786 | tlit = elf_zlib_default_table; | |
1787 | tdist = elf_zlib_default_dist_table; | |
1788 | } | |
1789 | else | |
1790 | { | |
1791 | unsigned int nlit; | |
1792 | unsigned int ndist; | |
1793 | unsigned int nclen; | |
1794 | unsigned char codebits[19]; | |
1795 | unsigned char *plenbase; | |
1796 | unsigned char *plen; | |
1797 | unsigned char *plenend; | |
1798 | ||
1799 | /* Read a Huffman encoding table. The various magic | |
1800 | numbers here are from RFC 1951. */ | |
1801 | ||
1802 | if (!elf_zlib_fetch (&pin, pinend, &val, &bits)) | |
1803 | return 0; | |
1804 | ||
1805 | nlit = (val & 0x1f) + 257; | |
1806 | val >>= 5; | |
1807 | ndist = (val & 0x1f) + 1; | |
1808 | val >>= 5; | |
1809 | nclen = (val & 0xf) + 4; | |
1810 | val >>= 4; | |
1811 | bits -= 14; | |
1812 | if (unlikely (nlit > 286 || ndist > 30)) | |
1813 | { | |
1814 | /* Values out of range. */ | |
1815 | elf_zlib_failed (); | |
1816 | return 0; | |
1817 | } | |
1818 | ||
1819 | /* Read and build the table used to compress the | |
1820 | literal, length, and distance codes. */ | |
1821 | ||
1822 | memset(&codebits[0], 0, 19); | |
1823 | ||
1824 | /* There are always at least 4 elements in the | |
1825 | table. */ | |
1826 | ||
1827 | if (!elf_zlib_fetch (&pin, pinend, &val, &bits)) | |
1828 | return 0; | |
1829 | ||
1830 | codebits[16] = val & 7; | |
1831 | codebits[17] = (val >> 3) & 7; | |
1832 | codebits[18] = (val >> 6) & 7; | |
1833 | codebits[0] = (val >> 9) & 7; | |
1834 | val >>= 12; | |
1835 | bits -= 12; | |
1836 | ||
1837 | if (nclen == 4) | |
1838 | goto codebitsdone; | |
1839 | ||
1840 | codebits[8] = val & 7; | |
1841 | val >>= 3; | |
1842 | bits -= 3; | |
1843 | ||
1844 | if (nclen == 5) | |
1845 | goto codebitsdone; | |
1846 | ||
1847 | if (!elf_zlib_fetch (&pin, pinend, &val, &bits)) | |
1848 | return 0; | |
1849 | ||
1850 | codebits[7] = val & 7; | |
1851 | val >>= 3; | |
1852 | bits -= 3; | |
1853 | ||
1854 | if (nclen == 6) | |
1855 | goto codebitsdone; | |
1856 | ||
1857 | codebits[9] = val & 7; | |
1858 | val >>= 3; | |
1859 | bits -= 3; | |
1860 | ||
1861 | if (nclen == 7) | |
1862 | goto codebitsdone; | |
1863 | ||
1864 | codebits[6] = val & 7; | |
1865 | val >>= 3; | |
1866 | bits -= 3; | |
1867 | ||
1868 | if (nclen == 8) | |
1869 | goto codebitsdone; | |
1870 | ||
1871 | codebits[10] = val & 7; | |
1872 | val >>= 3; | |
1873 | bits -= 3; | |
1874 | ||
1875 | if (nclen == 9) | |
1876 | goto codebitsdone; | |
1877 | ||
1878 | codebits[5] = val & 7; | |
1879 | val >>= 3; | |
1880 | bits -= 3; | |
1881 | ||
1882 | if (nclen == 10) | |
1883 | goto codebitsdone; | |
1884 | ||
1885 | if (!elf_zlib_fetch (&pin, pinend, &val, &bits)) | |
1886 | return 0; | |
1887 | ||
1888 | codebits[11] = val & 7; | |
1889 | val >>= 3; | |
1890 | bits -= 3; | |
1891 | ||
1892 | if (nclen == 11) | |
1893 | goto codebitsdone; | |
1894 | ||
1895 | codebits[4] = val & 7; | |
1896 | val >>= 3; | |
1897 | bits -= 3; | |
1898 | ||
1899 | if (nclen == 12) | |
1900 | goto codebitsdone; | |
1901 | ||
1902 | codebits[12] = val & 7; | |
1903 | val >>= 3; | |
1904 | bits -= 3; | |
1905 | ||
1906 | if (nclen == 13) | |
1907 | goto codebitsdone; | |
1908 | ||
1909 | codebits[3] = val & 7; | |
1910 | val >>= 3; | |
1911 | bits -= 3; | |
1912 | ||
1913 | if (nclen == 14) | |
1914 | goto codebitsdone; | |
1915 | ||
1916 | codebits[13] = val & 7; | |
1917 | val >>= 3; | |
1918 | bits -= 3; | |
1919 | ||
1920 | if (nclen == 15) | |
1921 | goto codebitsdone; | |
1922 | ||
1923 | if (!elf_zlib_fetch (&pin, pinend, &val, &bits)) | |
1924 | return 0; | |
1925 | ||
1926 | codebits[2] = val & 7; | |
1927 | val >>= 3; | |
1928 | bits -= 3; | |
1929 | ||
1930 | if (nclen == 16) | |
1931 | goto codebitsdone; | |
1932 | ||
1933 | codebits[14] = val & 7; | |
1934 | val >>= 3; | |
1935 | bits -= 3; | |
1936 | ||
1937 | if (nclen == 17) | |
1938 | goto codebitsdone; | |
1939 | ||
1940 | codebits[1] = val & 7; | |
1941 | val >>= 3; | |
1942 | bits -= 3; | |
1943 | ||
1944 | if (nclen == 18) | |
1945 | goto codebitsdone; | |
1946 | ||
1947 | codebits[15] = val & 7; | |
1948 | val >>= 3; | |
1949 | bits -= 3; | |
1950 | ||
1951 | codebitsdone: | |
1952 | ||
1953 | if (!elf_zlib_inflate_table (codebits, 19, zdebug_table, | |
1954 | zdebug_table)) | |
1955 | return 0; | |
1956 | ||
1957 | /* Read the compressed bit lengths of the literal, | |
1958 | length, and distance codes. We have allocated space | |
1959 | at the end of zdebug_table to hold them. */ | |
1960 | ||
1961 | plenbase = (((unsigned char *) zdebug_table) | |
1962 | + ZDEBUG_TABLE_CODELEN_OFFSET); | |
1963 | plen = plenbase; | |
1964 | plenend = plen + nlit + ndist; | |
1965 | while (plen < plenend) | |
1966 | { | |
1967 | uint16_t t; | |
1968 | unsigned int b; | |
1969 | uint16_t v; | |
1970 | ||
1971 | if (!elf_zlib_fetch (&pin, pinend, &val, &bits)) | |
1972 | return 0; | |
1973 | ||
1974 | t = zdebug_table[val & 0xff]; | |
1975 | ||
1976 | /* The compression here uses bit lengths up to 7, so | |
1977 | a secondary table is never necessary. */ | |
1978 | if (unlikely ((t & (1U << HUFFMAN_SECONDARY_SHIFT)) != 0)) | |
1979 | { | |
1980 | elf_zlib_failed (); | |
1981 | return 0; | |
1982 | } | |
1983 | ||
1984 | b = (t >> HUFFMAN_BITS_SHIFT) & HUFFMAN_BITS_MASK; | |
1985 | val >>= b + 1; | |
1986 | bits -= b + 1; | |
1987 | ||
1988 | v = t & HUFFMAN_VALUE_MASK; | |
1989 | if (v < 16) | |
1990 | *plen++ = v; | |
1991 | else if (v == 16) | |
1992 | { | |
1993 | unsigned int c; | |
1994 | unsigned int prev; | |
1995 | ||
1996 | /* Copy previous entry 3 to 6 times. */ | |
1997 | ||
1998 | if (unlikely (plen == plenbase)) | |
1999 | { | |
2000 | elf_zlib_failed (); | |
2001 | return 0; | |
2002 | } | |
2003 | ||
2004 | /* We used up to 7 bits since the last | |
2005 | elf_zlib_fetch, so we have at least 8 bits | |
2006 | available here. */ | |
2007 | ||
2008 | c = 3 + (val & 0x3); | |
2009 | val >>= 2; | |
2010 | bits -= 2; | |
2011 | if (unlikely ((unsigned int) (plenend - plen) < c)) | |
2012 | { | |
2013 | elf_zlib_failed (); | |
2014 | return 0; | |
2015 | } | |
2016 | ||
2017 | prev = plen[-1]; | |
2018 | switch (c) | |
2019 | { | |
2020 | case 6: | |
2021 | *plen++ = prev; | |
2022 | /* fallthrough */ | |
2023 | case 5: | |
2024 | *plen++ = prev; | |
2025 | /* fallthrough */ | |
2026 | case 4: | |
2027 | *plen++ = prev; | |
2028 | } | |
2029 | *plen++ = prev; | |
2030 | *plen++ = prev; | |
2031 | *plen++ = prev; | |
2032 | } | |
2033 | else if (v == 17) | |
2034 | { | |
2035 | unsigned int c; | |
2036 | ||
2037 | /* Store zero 3 to 10 times. */ | |
2038 | ||
2039 | /* We used up to 7 bits since the last | |
2040 | elf_zlib_fetch, so we have at least 8 bits | |
2041 | available here. */ | |
2042 | ||
2043 | c = 3 + (val & 0x7); | |
2044 | val >>= 3; | |
2045 | bits -= 3; | |
2046 | if (unlikely ((unsigned int) (plenend - plen) < c)) | |
2047 | { | |
2048 | elf_zlib_failed (); | |
2049 | return 0; | |
2050 | } | |
2051 | ||
2052 | switch (c) | |
2053 | { | |
2054 | case 10: | |
2055 | *plen++ = 0; | |
2056 | /* fallthrough */ | |
2057 | case 9: | |
2058 | *plen++ = 0; | |
2059 | /* fallthrough */ | |
2060 | case 8: | |
2061 | *plen++ = 0; | |
2062 | /* fallthrough */ | |
2063 | case 7: | |
2064 | *plen++ = 0; | |
2065 | /* fallthrough */ | |
2066 | case 6: | |
2067 | *plen++ = 0; | |
2068 | /* fallthrough */ | |
2069 | case 5: | |
2070 | *plen++ = 0; | |
2071 | /* fallthrough */ | |
2072 | case 4: | |
2073 | *plen++ = 0; | |
2074 | } | |
2075 | *plen++ = 0; | |
2076 | *plen++ = 0; | |
2077 | *plen++ = 0; | |
2078 | } | |
2079 | else if (v == 18) | |
2080 | { | |
2081 | unsigned int c; | |
2082 | ||
2083 | /* Store zero 11 to 138 times. */ | |
2084 | ||
2085 | /* We used up to 7 bits since the last | |
2086 | elf_zlib_fetch, so we have at least 8 bits | |
2087 | available here. */ | |
2088 | ||
2089 | c = 11 + (val & 0x7f); | |
2090 | val >>= 7; | |
2091 | bits -= 7; | |
2092 | if (unlikely ((unsigned int) (plenend - plen) < c)) | |
2093 | { | |
2094 | elf_zlib_failed (); | |
2095 | return 0; | |
2096 | } | |
2097 | ||
2098 | memset (plen, 0, c); | |
2099 | plen += c; | |
2100 | } | |
2101 | else | |
2102 | { | |
2103 | elf_zlib_failed (); | |
2104 | return 0; | |
2105 | } | |
2106 | } | |
2107 | ||
2108 | /* Make sure that the stop code can appear. */ | |
2109 | ||
2110 | plen = plenbase; | |
2111 | if (unlikely (plen[256] == 0)) | |
2112 | { | |
2113 | elf_zlib_failed (); | |
2114 | return 0; | |
2115 | } | |
2116 | ||
2117 | /* Build the decompression tables. */ | |
2118 | ||
2119 | if (!elf_zlib_inflate_table (plen, nlit, zdebug_table, | |
2120 | zdebug_table)) | |
2121 | return 0; | |
2122 | if (!elf_zlib_inflate_table (plen + nlit, ndist, zdebug_table, | |
2123 | zdebug_table + HUFFMAN_TABLE_SIZE)) | |
2124 | return 0; | |
2125 | tlit = zdebug_table; | |
2126 | tdist = zdebug_table + HUFFMAN_TABLE_SIZE; | |
2127 | } | |
2128 | ||
2129 | /* Inflate values until the end of the block. This is the | |
2130 | main loop of the inflation code. */ | |
2131 | ||
2132 | while (1) | |
2133 | { | |
2134 | uint16_t t; | |
2135 | unsigned int b; | |
2136 | uint16_t v; | |
2137 | unsigned int lit; | |
2138 | ||
2139 | if (!elf_zlib_fetch (&pin, pinend, &val, &bits)) | |
2140 | return 0; | |
2141 | ||
2142 | t = tlit[val & 0xff]; | |
2143 | b = (t >> HUFFMAN_BITS_SHIFT) & HUFFMAN_BITS_MASK; | |
2144 | v = t & HUFFMAN_VALUE_MASK; | |
2145 | ||
2146 | if ((t & (1U << HUFFMAN_SECONDARY_SHIFT)) == 0) | |
2147 | { | |
2148 | lit = v; | |
2149 | val >>= b + 1; | |
2150 | bits -= b + 1; | |
2151 | } | |
2152 | else | |
2153 | { | |
2154 | t = tlit[v + 0x100 + ((val >> 8) & ((1U << b) - 1))]; | |
2155 | b = (t >> HUFFMAN_BITS_SHIFT) & HUFFMAN_BITS_MASK; | |
2156 | lit = t & HUFFMAN_VALUE_MASK; | |
2157 | val >>= b + 8; | |
2158 | bits -= b + 8; | |
2159 | } | |
2160 | ||
2161 | if (lit < 256) | |
2162 | { | |
2163 | if (unlikely (pout == poutend)) | |
2164 | { | |
2165 | elf_zlib_failed (); | |
2166 | return 0; | |
2167 | } | |
2168 | ||
2169 | *pout++ = lit; | |
2170 | ||
2171 | /* We will need to write the next byte soon. We ask | |
2172 | for high temporal locality because we will write | |
2173 | to the whole cache line soon. */ | |
2174 | __builtin_prefetch (pout, 1, 3); | |
2175 | } | |
2176 | else if (lit == 256) | |
2177 | { | |
2178 | /* The end of the block. */ | |
2179 | break; | |
2180 | } | |
2181 | else | |
2182 | { | |
2183 | unsigned int dist; | |
2184 | unsigned int len; | |
2185 | ||
2186 | /* Convert lit into a length. */ | |
2187 | ||
2188 | if (lit < 265) | |
2189 | len = lit - 257 + 3; | |
2190 | else if (lit == 285) | |
2191 | len = 258; | |
2192 | else if (unlikely (lit > 285)) | |
2193 | { | |
2194 | elf_zlib_failed (); | |
2195 | return 0; | |
2196 | } | |
2197 | else | |
2198 | { | |
2199 | unsigned int extra; | |
2200 | ||
2201 | if (!elf_zlib_fetch (&pin, pinend, &val, &bits)) | |
2202 | return 0; | |
2203 | ||
2204 | /* This is an expression for the table of length | |
2205 | codes in RFC 1951 3.2.5. */ | |
2206 | lit -= 265; | |
2207 | extra = (lit >> 2) + 1; | |
2208 | len = (lit & 3) << extra; | |
2209 | len += 11; | |
2210 | len += ((1U << (extra - 1)) - 1) << 3; | |
2211 | len += val & ((1U << extra) - 1); | |
2212 | val >>= extra; | |
2213 | bits -= extra; | |
2214 | } | |
2215 | ||
2216 | if (!elf_zlib_fetch (&pin, pinend, &val, &bits)) | |
2217 | return 0; | |
2218 | ||
2219 | t = tdist[val & 0xff]; | |
2220 | b = (t >> HUFFMAN_BITS_SHIFT) & HUFFMAN_BITS_MASK; | |
2221 | v = t & HUFFMAN_VALUE_MASK; | |
2222 | ||
2223 | if ((t & (1U << HUFFMAN_SECONDARY_SHIFT)) == 0) | |
2224 | { | |
2225 | dist = v; | |
2226 | val >>= b + 1; | |
2227 | bits -= b + 1; | |
2228 | } | |
2229 | else | |
2230 | { | |
2231 | t = tdist[v + 0x100 + ((val >> 8) & ((1U << b) - 1))]; | |
2232 | b = (t >> HUFFMAN_BITS_SHIFT) & HUFFMAN_BITS_MASK; | |
2233 | dist = t & HUFFMAN_VALUE_MASK; | |
2234 | val >>= b + 8; | |
2235 | bits -= b + 8; | |
2236 | } | |
2237 | ||
2238 | /* Convert dist to a distance. */ | |
2239 | ||
2240 | if (dist == 0) | |
2241 | { | |
2242 | /* A distance of 1. A common case, meaning | |
2243 | repeat the last character LEN times. */ | |
2244 | ||
2245 | if (unlikely (pout == porigout)) | |
2246 | { | |
2247 | elf_zlib_failed (); | |
2248 | return 0; | |
2249 | } | |
2250 | ||
2251 | if (unlikely ((unsigned int) (poutend - pout) < len)) | |
2252 | { | |
2253 | elf_zlib_failed (); | |
2254 | return 0; | |
2255 | } | |
2256 | ||
2257 | memset (pout, pout[-1], len); | |
2258 | pout += len; | |
2259 | } | |
2260 | else if (unlikely (dist > 29)) | |
2261 | { | |
2262 | elf_zlib_failed (); | |
2263 | return 0; | |
2264 | } | |
2265 | else | |
2266 | { | |
2267 | if (dist < 4) | |
2268 | dist = dist + 1; | |
2269 | else | |
2270 | { | |
2271 | unsigned int extra; | |
2272 | ||
2273 | if (!elf_zlib_fetch (&pin, pinend, &val, &bits)) | |
2274 | return 0; | |
2275 | ||
2276 | /* This is an expression for the table of | |
2277 | distance codes in RFC 1951 3.2.5. */ | |
2278 | dist -= 4; | |
2279 | extra = (dist >> 1) + 1; | |
2280 | dist = (dist & 1) << extra; | |
2281 | dist += 5; | |
2282 | dist += ((1U << (extra - 1)) - 1) << 2; | |
2283 | dist += val & ((1U << extra) - 1); | |
2284 | val >>= extra; | |
2285 | bits -= extra; | |
2286 | } | |
2287 | ||
2288 | /* Go back dist bytes, and copy len bytes from | |
2289 | there. */ | |
2290 | ||
2291 | if (unlikely ((unsigned int) (pout - porigout) < dist)) | |
2292 | { | |
2293 | elf_zlib_failed (); | |
2294 | return 0; | |
2295 | } | |
2296 | ||
2297 | if (unlikely ((unsigned int) (poutend - pout) < len)) | |
2298 | { | |
2299 | elf_zlib_failed (); | |
2300 | return 0; | |
2301 | } | |
2302 | ||
2303 | if (dist >= len) | |
2304 | { | |
2305 | memcpy (pout, pout - dist, len); | |
2306 | pout += len; | |
2307 | } | |
2308 | else | |
2309 | { | |
2310 | while (len > 0) | |
2311 | { | |
2312 | unsigned int copy; | |
2313 | ||
2314 | copy = len < dist ? len : dist; | |
2315 | memcpy (pout, pout - dist, copy); | |
2316 | len -= copy; | |
2317 | pout += copy; | |
2318 | } | |
2319 | } | |
2320 | } | |
2321 | } | |
2322 | } | |
2323 | } | |
2324 | } | |
2325 | ||
2326 | /* We should have filled the output buffer. */ | |
2327 | if (unlikely (pout != poutend)) | |
2328 | { | |
2329 | elf_zlib_failed (); | |
2330 | return 0; | |
2331 | } | |
2332 | ||
2333 | return 1; | |
2334 | } | |
2335 | ||
2336 | /* Verify the zlib checksum. The checksum is in the 4 bytes at | |
2337 | CHECKBYTES, and the uncompressed data is at UNCOMPRESSED / | |
2338 | UNCOMPRESSED_SIZE. Returns 1 on success, 0 on failure. */ | |
2339 | ||
2340 | static int | |
2341 | elf_zlib_verify_checksum (const unsigned char *checkbytes, | |
2342 | const unsigned char *uncompressed, | |
2343 | size_t uncompressed_size) | |
2344 | { | |
2345 | unsigned int i; | |
2346 | unsigned int cksum; | |
2347 | const unsigned char *p; | |
2348 | uint32_t s1; | |
2349 | uint32_t s2; | |
2350 | size_t hsz; | |
2351 | ||
2352 | cksum = 0; | |
2353 | for (i = 0; i < 4; i++) | |
2354 | cksum = (cksum << 8) | checkbytes[i]; | |
2355 | ||
2356 | s1 = 1; | |
2357 | s2 = 0; | |
2358 | ||
2359 | /* Minimize modulo operations. */ | |
2360 | ||
2361 | p = uncompressed; | |
2362 | hsz = uncompressed_size; | |
2363 | while (hsz >= 5552) | |
2364 | { | |
2365 | for (i = 0; i < 5552; i += 16) | |
2366 | { | |
2367 | /* Manually unroll loop 16 times. */ | |
2368 | s1 = s1 + *p++; | |
2369 | s2 = s2 + s1; | |
2370 | s1 = s1 + *p++; | |
2371 | s2 = s2 + s1; | |
2372 | s1 = s1 + *p++; | |
2373 | s2 = s2 + s1; | |
2374 | s1 = s1 + *p++; | |
2375 | s2 = s2 + s1; | |
2376 | s1 = s1 + *p++; | |
2377 | s2 = s2 + s1; | |
2378 | s1 = s1 + *p++; | |
2379 | s2 = s2 + s1; | |
2380 | s1 = s1 + *p++; | |
2381 | s2 = s2 + s1; | |
2382 | s1 = s1 + *p++; | |
2383 | s2 = s2 + s1; | |
2384 | s1 = s1 + *p++; | |
2385 | s2 = s2 + s1; | |
2386 | s1 = s1 + *p++; | |
2387 | s2 = s2 + s1; | |
2388 | s1 = s1 + *p++; | |
2389 | s2 = s2 + s1; | |
2390 | s1 = s1 + *p++; | |
2391 | s2 = s2 + s1; | |
2392 | s1 = s1 + *p++; | |
2393 | s2 = s2 + s1; | |
2394 | s1 = s1 + *p++; | |
2395 | s2 = s2 + s1; | |
2396 | s1 = s1 + *p++; | |
2397 | s2 = s2 + s1; | |
2398 | s1 = s1 + *p++; | |
2399 | s2 = s2 + s1; | |
2400 | } | |
2401 | hsz -= 5552; | |
2402 | s1 %= 65521; | |
2403 | s2 %= 65521; | |
2404 | } | |
2405 | ||
2406 | while (hsz >= 16) | |
2407 | { | |
2408 | /* Manually unroll loop 16 times. */ | |
2409 | s1 = s1 + *p++; | |
2410 | s2 = s2 + s1; | |
2411 | s1 = s1 + *p++; | |
2412 | s2 = s2 + s1; | |
2413 | s1 = s1 + *p++; | |
2414 | s2 = s2 + s1; | |
2415 | s1 = s1 + *p++; | |
2416 | s2 = s2 + s1; | |
2417 | s1 = s1 + *p++; | |
2418 | s2 = s2 + s1; | |
2419 | s1 = s1 + *p++; | |
2420 | s2 = s2 + s1; | |
2421 | s1 = s1 + *p++; | |
2422 | s2 = s2 + s1; | |
2423 | s1 = s1 + *p++; | |
2424 | s2 = s2 + s1; | |
2425 | s1 = s1 + *p++; | |
2426 | s2 = s2 + s1; | |
2427 | s1 = s1 + *p++; | |
2428 | s2 = s2 + s1; | |
2429 | s1 = s1 + *p++; | |
2430 | s2 = s2 + s1; | |
2431 | s1 = s1 + *p++; | |
2432 | s2 = s2 + s1; | |
2433 | s1 = s1 + *p++; | |
2434 | s2 = s2 + s1; | |
2435 | s1 = s1 + *p++; | |
2436 | s2 = s2 + s1; | |
2437 | s1 = s1 + *p++; | |
2438 | s2 = s2 + s1; | |
2439 | s1 = s1 + *p++; | |
2440 | s2 = s2 + s1; | |
2441 | ||
2442 | hsz -= 16; | |
2443 | } | |
2444 | ||
2445 | for (i = 0; i < hsz; ++i) | |
2446 | { | |
2447 | s1 = s1 + *p++; | |
2448 | s2 = s2 + s1; | |
2449 | } | |
2450 | ||
2451 | s1 %= 65521; | |
2452 | s2 %= 65521; | |
2453 | ||
2454 | if (unlikely ((s2 << 16) + s1 != cksum)) | |
2455 | { | |
2456 | elf_zlib_failed (); | |
2457 | return 0; | |
2458 | } | |
2459 | ||
2460 | return 1; | |
2461 | } | |
2462 | ||
2463 | /* Inflate a zlib stream from PIN/SIN to POUT/SOUT, and verify the | |
2464 | checksum. Return 1 on success, 0 on error. */ | |
2465 | ||
2466 | static int | |
2467 | elf_zlib_inflate_and_verify (const unsigned char *pin, size_t sin, | |
2468 | uint16_t *zdebug_table, unsigned char *pout, | |
2469 | size_t sout) | |
2470 | { | |
2471 | if (!elf_zlib_inflate (pin, sin, zdebug_table, pout, sout)) | |
2472 | return 0; | |
2473 | if (!elf_zlib_verify_checksum (pin + sin - 4, pout, sout)) | |
2474 | return 0; | |
2475 | return 1; | |
2476 | } | |
2477 | ||
2478 | /* Uncompress the old compressed debug format, the one emitted by | |
2479 | --compress-debug-sections=zlib-gnu. The compressed data is in | |
2480 | COMPRESSED / COMPRESSED_SIZE, and the function writes to | |
2481 | *UNCOMPRESSED / *UNCOMPRESSED_SIZE. ZDEBUG_TABLE is work space to | |
2482 | hold Huffman tables. Returns 0 on error, 1 on successful | |
2483 | decompression or if something goes wrong. In general we try to | |
2484 | carry on, by returning 1, even if we can't decompress. */ | |
2485 | ||
2486 | static int | |
2487 | elf_uncompress_zdebug (struct backtrace_state *state, | |
2488 | const unsigned char *compressed, size_t compressed_size, | |
2489 | uint16_t *zdebug_table, | |
2490 | backtrace_error_callback error_callback, void *data, | |
2491 | unsigned char **uncompressed, size_t *uncompressed_size) | |
2492 | { | |
2493 | size_t sz; | |
2494 | size_t i; | |
2495 | unsigned char *po; | |
2496 | ||
2497 | *uncompressed = NULL; | |
2498 | *uncompressed_size = 0; | |
2499 | ||
2500 | /* The format starts with the four bytes ZLIB, followed by the 8 | |
2501 | byte length of the uncompressed data in big-endian order, | |
2502 | followed by a zlib stream. */ | |
2503 | ||
2504 | if (compressed_size < 12 || memcmp (compressed, "ZLIB", 4) != 0) | |
2505 | return 1; | |
2506 | ||
2507 | sz = 0; | |
2508 | for (i = 0; i < 8; i++) | |
2509 | sz = (sz << 8) | compressed[i + 4]; | |
2510 | ||
2511 | if (*uncompressed != NULL && *uncompressed_size >= sz) | |
2512 | po = *uncompressed; | |
2513 | else | |
2514 | { | |
2515 | po = (unsigned char *) backtrace_alloc (state, sz, error_callback, data); | |
2516 | if (po == NULL) | |
2517 | return 0; | |
2518 | } | |
2519 | ||
2520 | if (!elf_zlib_inflate_and_verify (compressed + 12, compressed_size - 12, | |
2521 | zdebug_table, po, sz)) | |
2522 | return 1; | |
2523 | ||
2524 | *uncompressed = po; | |
2525 | *uncompressed_size = sz; | |
2526 | ||
2527 | return 1; | |
2528 | } | |
2529 | ||
2530 | /* Uncompress the new compressed debug format, the official standard | |
2531 | ELF approach emitted by --compress-debug-sections=zlib-gabi. The | |
2532 | compressed data is in COMPRESSED / COMPRESSED_SIZE, and the | |
2533 | function writes to *UNCOMPRESSED / *UNCOMPRESSED_SIZE. | |
2534 | ZDEBUG_TABLE is work space as for elf_uncompress_zdebug. Returns 0 | |
2535 | on error, 1 on successful decompression or if something goes wrong. | |
2536 | In general we try to carry on, by returning 1, even if we can't | |
2537 | decompress. */ | |
2538 | ||
2539 | static int | |
2540 | elf_uncompress_chdr (struct backtrace_state *state, | |
2541 | const unsigned char *compressed, size_t compressed_size, | |
2542 | uint16_t *zdebug_table, | |
2543 | backtrace_error_callback error_callback, void *data, | |
2544 | unsigned char **uncompressed, size_t *uncompressed_size) | |
2545 | { | |
2546 | const b_elf_chdr *chdr; | |
2547 | unsigned char *po; | |
2548 | ||
2549 | *uncompressed = NULL; | |
2550 | *uncompressed_size = 0; | |
2551 | ||
2552 | /* The format starts with an ELF compression header. */ | |
2553 | if (compressed_size < sizeof (b_elf_chdr)) | |
2554 | return 1; | |
2555 | ||
2556 | chdr = (const b_elf_chdr *) compressed; | |
2557 | ||
2558 | if (chdr->ch_type != ELFCOMPRESS_ZLIB) | |
2559 | { | |
2560 | /* Unsupported compression algorithm. */ | |
2561 | return 1; | |
2562 | } | |
2563 | ||
2564 | if (*uncompressed != NULL && *uncompressed_size >= chdr->ch_size) | |
2565 | po = *uncompressed; | |
2566 | else | |
2567 | { | |
2568 | po = (unsigned char *) backtrace_alloc (state, chdr->ch_size, | |
2569 | error_callback, data); | |
2570 | if (po == NULL) | |
2571 | return 0; | |
2572 | } | |
2573 | ||
2574 | if (!elf_zlib_inflate_and_verify (compressed + sizeof (b_elf_chdr), | |
2575 | compressed_size - sizeof (b_elf_chdr), | |
2576 | zdebug_table, po, chdr->ch_size)) | |
2577 | return 1; | |
2578 | ||
2579 | *uncompressed = po; | |
2580 | *uncompressed_size = chdr->ch_size; | |
2581 | ||
2582 | return 1; | |
2583 | } | |
2584 | ||
2585 | /* This function is a hook for testing the zlib support. It is only | |
2586 | used by tests. */ | |
2587 | ||
2588 | int | |
2589 | backtrace_uncompress_zdebug (struct backtrace_state *state, | |
2590 | const unsigned char *compressed, | |
2591 | size_t compressed_size, | |
2592 | backtrace_error_callback error_callback, | |
2593 | void *data, unsigned char **uncompressed, | |
2594 | size_t *uncompressed_size) | |
2595 | { | |
2596 | uint16_t *zdebug_table; | |
2597 | int ret; | |
2598 | ||
2599 | zdebug_table = ((uint16_t *) backtrace_alloc (state, ZDEBUG_TABLE_SIZE, | |
2600 | error_callback, data)); | |
2601 | if (zdebug_table == NULL) | |
2602 | return 0; | |
2603 | ret = elf_uncompress_zdebug (state, compressed, compressed_size, | |
2604 | zdebug_table, error_callback, data, | |
2605 | uncompressed, uncompressed_size); | |
2606 | backtrace_free (state, zdebug_table, ZDEBUG_TABLE_SIZE, | |
2607 | error_callback, data); | |
2608 | return ret; | |
2609 | } | |
2610 | ||
2611 | /* Add the backtrace data for one ELF file. Returns 1 on success, | |
2612 | 0 on failure (in both cases descriptor is closed) or -1 if exe | |
2613 | is non-zero and the ELF file is ET_DYN, which tells the caller that | |
2614 | elf_add will need to be called on the descriptor again after | |
2615 | base_address is determined. */ | |
2616 | ||
2617 | static int | |
2618 | elf_add (struct backtrace_state *state, const char *filename, int descriptor, | |
2619 | uintptr_t base_address, backtrace_error_callback error_callback, | |
2620 | void *data, fileline *fileline_fn, int *found_sym, int *found_dwarf, | |
ba9703b0 XL |
2621 | struct dwarf_data **fileline_entry, int exe, int debuginfo, |
2622 | const char *with_buildid_data, uint32_t with_buildid_size) | |
94b46f34 XL |
2623 | { |
2624 | struct backtrace_view ehdr_view; | |
2625 | b_elf_ehdr ehdr; | |
2626 | off_t shoff; | |
2627 | unsigned int shnum; | |
2628 | unsigned int shstrndx; | |
2629 | struct backtrace_view shdrs_view; | |
2630 | int shdrs_view_valid; | |
2631 | const b_elf_shdr *shdrs; | |
2632 | const b_elf_shdr *shstrhdr; | |
2633 | size_t shstr_size; | |
2634 | off_t shstr_off; | |
2635 | struct backtrace_view names_view; | |
2636 | int names_view_valid; | |
2637 | const char *names; | |
2638 | unsigned int symtab_shndx; | |
2639 | unsigned int dynsym_shndx; | |
2640 | unsigned int i; | |
2641 | struct debug_section_info sections[DEBUG_MAX]; | |
ba9703b0 | 2642 | struct debug_section_info zsections[DEBUG_MAX]; |
94b46f34 XL |
2643 | struct backtrace_view symtab_view; |
2644 | int symtab_view_valid; | |
2645 | struct backtrace_view strtab_view; | |
2646 | int strtab_view_valid; | |
2647 | struct backtrace_view buildid_view; | |
2648 | int buildid_view_valid; | |
2649 | const char *buildid_data; | |
2650 | uint32_t buildid_size; | |
2651 | struct backtrace_view debuglink_view; | |
2652 | int debuglink_view_valid; | |
2653 | const char *debuglink_name; | |
2654 | uint32_t debuglink_crc; | |
ba9703b0 XL |
2655 | struct backtrace_view debugaltlink_view; |
2656 | int debugaltlink_view_valid; | |
2657 | const char *debugaltlink_name; | |
2658 | const char *debugaltlink_buildid_data; | |
2659 | uint32_t debugaltlink_buildid_size; | |
94b46f34 XL |
2660 | off_t min_offset; |
2661 | off_t max_offset; | |
ba9703b0 | 2662 | off_t debug_size; |
94b46f34 XL |
2663 | struct backtrace_view debug_view; |
2664 | int debug_view_valid; | |
2665 | unsigned int using_debug_view; | |
2666 | uint16_t *zdebug_table; | |
ba9703b0 XL |
2667 | struct backtrace_view split_debug_view[DEBUG_MAX]; |
2668 | unsigned char split_debug_view_valid[DEBUG_MAX]; | |
94b46f34 | 2669 | struct elf_ppc64_opd_data opd_data, *opd; |
ba9703b0 | 2670 | struct dwarf_sections dwarf_sections; |
94b46f34 XL |
2671 | |
2672 | if (!debuginfo) | |
2673 | { | |
2674 | *found_sym = 0; | |
2675 | *found_dwarf = 0; | |
2676 | } | |
2677 | ||
2678 | shdrs_view_valid = 0; | |
2679 | names_view_valid = 0; | |
2680 | symtab_view_valid = 0; | |
2681 | strtab_view_valid = 0; | |
2682 | buildid_view_valid = 0; | |
2683 | buildid_data = NULL; | |
2684 | buildid_size = 0; | |
2685 | debuglink_view_valid = 0; | |
2686 | debuglink_name = NULL; | |
2687 | debuglink_crc = 0; | |
ba9703b0 XL |
2688 | debugaltlink_view_valid = 0; |
2689 | debugaltlink_name = NULL; | |
2690 | debugaltlink_buildid_data = NULL; | |
2691 | debugaltlink_buildid_size = 0; | |
94b46f34 | 2692 | debug_view_valid = 0; |
ba9703b0 | 2693 | memset (&split_debug_view_valid[0], 0, sizeof split_debug_view_valid); |
94b46f34 XL |
2694 | opd = NULL; |
2695 | ||
2696 | if (!backtrace_get_view (state, descriptor, 0, sizeof ehdr, error_callback, | |
2697 | data, &ehdr_view)) | |
2698 | goto fail; | |
2699 | ||
2700 | memcpy (&ehdr, ehdr_view.data, sizeof ehdr); | |
2701 | ||
2702 | backtrace_release_view (state, &ehdr_view, error_callback, data); | |
2703 | ||
2704 | if (ehdr.e_ident[EI_MAG0] != ELFMAG0 | |
2705 | || ehdr.e_ident[EI_MAG1] != ELFMAG1 | |
2706 | || ehdr.e_ident[EI_MAG2] != ELFMAG2 | |
2707 | || ehdr.e_ident[EI_MAG3] != ELFMAG3) | |
2708 | { | |
2709 | error_callback (data, "executable file is not ELF", 0); | |
2710 | goto fail; | |
2711 | } | |
2712 | if (ehdr.e_ident[EI_VERSION] != EV_CURRENT) | |
2713 | { | |
2714 | error_callback (data, "executable file is unrecognized ELF version", 0); | |
2715 | goto fail; | |
2716 | } | |
2717 | ||
2718 | #if BACKTRACE_ELF_SIZE == 32 | |
2719 | #define BACKTRACE_ELFCLASS ELFCLASS32 | |
2720 | #else | |
2721 | #define BACKTRACE_ELFCLASS ELFCLASS64 | |
2722 | #endif | |
2723 | ||
2724 | if (ehdr.e_ident[EI_CLASS] != BACKTRACE_ELFCLASS) | |
2725 | { | |
2726 | error_callback (data, "executable file is unexpected ELF class", 0); | |
2727 | goto fail; | |
2728 | } | |
2729 | ||
2730 | if (ehdr.e_ident[EI_DATA] != ELFDATA2LSB | |
2731 | && ehdr.e_ident[EI_DATA] != ELFDATA2MSB) | |
2732 | { | |
2733 | error_callback (data, "executable file has unknown endianness", 0); | |
2734 | goto fail; | |
2735 | } | |
2736 | ||
2737 | /* If the executable is ET_DYN, it is either a PIE, or we are running | |
2738 | directly a shared library with .interp. We need to wait for | |
2739 | dl_iterate_phdr in that case to determine the actual base_address. */ | |
2740 | if (exe && ehdr.e_type == ET_DYN) | |
2741 | return -1; | |
2742 | ||
2743 | shoff = ehdr.e_shoff; | |
2744 | shnum = ehdr.e_shnum; | |
2745 | shstrndx = ehdr.e_shstrndx; | |
2746 | ||
2747 | if ((shnum == 0 || shstrndx == SHN_XINDEX) | |
2748 | && shoff != 0) | |
2749 | { | |
2750 | struct backtrace_view shdr_view; | |
2751 | const b_elf_shdr *shdr; | |
2752 | ||
2753 | if (!backtrace_get_view (state, descriptor, shoff, sizeof shdr, | |
2754 | error_callback, data, &shdr_view)) | |
2755 | goto fail; | |
2756 | ||
2757 | shdr = (const b_elf_shdr *) shdr_view.data; | |
2758 | ||
2759 | if (shnum == 0) | |
2760 | shnum = shdr->sh_size; | |
2761 | ||
2762 | if (shstrndx == SHN_XINDEX) | |
2763 | { | |
2764 | shstrndx = shdr->sh_link; | |
2765 | ||
2766 | /* Versions of the GNU binutils between 2.12 and 2.18 did | |
2767 | not handle objects with more than SHN_LORESERVE sections | |
2768 | correctly. All large section indexes were offset by | |
2769 | 0x100. There is more information at | |
2770 | http://sourceware.org/bugzilla/show_bug.cgi?id-5900 . | |
2771 | Fortunately these object files are easy to detect, as the | |
2772 | GNU binutils always put the section header string table | |
2773 | near the end of the list of sections. Thus if the | |
2774 | section header string table index is larger than the | |
2775 | number of sections, then we know we have to subtract | |
2776 | 0x100 to get the real section index. */ | |
2777 | if (shstrndx >= shnum && shstrndx >= SHN_LORESERVE + 0x100) | |
2778 | shstrndx -= 0x100; | |
2779 | } | |
2780 | ||
2781 | backtrace_release_view (state, &shdr_view, error_callback, data); | |
2782 | } | |
2783 | ||
2784 | /* To translate PC to file/line when using DWARF, we need to find | |
2785 | the .debug_info and .debug_line sections. */ | |
2786 | ||
2787 | /* Read the section headers, skipping the first one. */ | |
2788 | ||
2789 | if (!backtrace_get_view (state, descriptor, shoff + sizeof (b_elf_shdr), | |
2790 | (shnum - 1) * sizeof (b_elf_shdr), | |
2791 | error_callback, data, &shdrs_view)) | |
2792 | goto fail; | |
2793 | shdrs_view_valid = 1; | |
2794 | shdrs = (const b_elf_shdr *) shdrs_view.data; | |
2795 | ||
2796 | /* Read the section names. */ | |
2797 | ||
2798 | shstrhdr = &shdrs[shstrndx - 1]; | |
2799 | shstr_size = shstrhdr->sh_size; | |
2800 | shstr_off = shstrhdr->sh_offset; | |
2801 | ||
ba9703b0 | 2802 | if (!backtrace_get_view (state, descriptor, shstr_off, shstrhdr->sh_size, |
94b46f34 XL |
2803 | error_callback, data, &names_view)) |
2804 | goto fail; | |
2805 | names_view_valid = 1; | |
2806 | names = (const char *) names_view.data; | |
2807 | ||
2808 | symtab_shndx = 0; | |
2809 | dynsym_shndx = 0; | |
2810 | ||
2811 | memset (sections, 0, sizeof sections); | |
ba9703b0 | 2812 | memset (zsections, 0, sizeof zsections); |
94b46f34 XL |
2813 | |
2814 | /* Look for the symbol table. */ | |
2815 | for (i = 1; i < shnum; ++i) | |
2816 | { | |
2817 | const b_elf_shdr *shdr; | |
2818 | unsigned int sh_name; | |
2819 | const char *name; | |
2820 | int j; | |
2821 | ||
2822 | shdr = &shdrs[i - 1]; | |
2823 | ||
2824 | if (shdr->sh_type == SHT_SYMTAB) | |
2825 | symtab_shndx = i; | |
2826 | else if (shdr->sh_type == SHT_DYNSYM) | |
2827 | dynsym_shndx = i; | |
2828 | ||
2829 | sh_name = shdr->sh_name; | |
2830 | if (sh_name >= shstr_size) | |
2831 | { | |
2832 | error_callback (data, "ELF section name out of range", 0); | |
2833 | goto fail; | |
2834 | } | |
2835 | ||
2836 | name = names + sh_name; | |
2837 | ||
2838 | for (j = 0; j < (int) DEBUG_MAX; ++j) | |
2839 | { | |
ba9703b0 | 2840 | if (strcmp (name, dwarf_section_names[j]) == 0) |
1a4d82fc JJ |
2841 | { |
2842 | sections[j].offset = shdr->sh_offset; | |
2843 | sections[j].size = shdr->sh_size; | |
94b46f34 | 2844 | sections[j].compressed = (shdr->sh_flags & SHF_COMPRESSED) != 0; |
1a4d82fc JJ |
2845 | break; |
2846 | } | |
2847 | } | |
94b46f34 | 2848 | |
ba9703b0 XL |
2849 | if (name[0] == '.' && name[1] == 'z') |
2850 | { | |
2851 | for (j = 0; j < (int) DEBUG_MAX; ++j) | |
2852 | { | |
2853 | if (strcmp (name + 2, dwarf_section_names[j] + 1) == 0) | |
2854 | { | |
2855 | zsections[j].offset = shdr->sh_offset; | |
2856 | zsections[j].size = shdr->sh_size; | |
2857 | break; | |
2858 | } | |
2859 | } | |
2860 | } | |
2861 | ||
94b46f34 XL |
2862 | /* Read the build ID if present. This could check for any |
2863 | SHT_NOTE section with the right note name and type, but gdb | |
2864 | looks for a specific section name. */ | |
ba9703b0 | 2865 | if ((!debuginfo || with_buildid_data != NULL) |
94b46f34 XL |
2866 | && !buildid_view_valid |
2867 | && strcmp (name, ".note.gnu.build-id") == 0) | |
2868 | { | |
2869 | const b_elf_note *note; | |
2870 | ||
2871 | if (!backtrace_get_view (state, descriptor, shdr->sh_offset, | |
2872 | shdr->sh_size, error_callback, data, | |
2873 | &buildid_view)) | |
2874 | goto fail; | |
2875 | ||
2876 | buildid_view_valid = 1; | |
2877 | note = (const b_elf_note *) buildid_view.data; | |
2878 | if (note->type == NT_GNU_BUILD_ID | |
2879 | && note->namesz == 4 | |
2880 | && strncmp (note->name, "GNU", 4) == 0 | |
ba9703b0 | 2881 | && shdr->sh_size <= 12 + ((note->namesz + 3) & ~ 3) + note->descsz) |
94b46f34 XL |
2882 | { |
2883 | buildid_data = ¬e->name[0] + ((note->namesz + 3) & ~ 3); | |
2884 | buildid_size = note->descsz; | |
2885 | } | |
ba9703b0 XL |
2886 | |
2887 | if (with_buildid_size != 0) | |
2888 | { | |
2889 | if (buildid_size != with_buildid_size) | |
2890 | goto fail; | |
2891 | ||
2892 | if (memcmp (buildid_data, with_buildid_data, buildid_size) != 0) | |
2893 | goto fail; | |
2894 | } | |
94b46f34 XL |
2895 | } |
2896 | ||
2897 | /* Read the debuglink file if present. */ | |
2898 | if (!debuginfo | |
2899 | && !debuglink_view_valid | |
2900 | && strcmp (name, ".gnu_debuglink") == 0) | |
2901 | { | |
2902 | const char *debuglink_data; | |
2903 | size_t crc_offset; | |
2904 | ||
2905 | if (!backtrace_get_view (state, descriptor, shdr->sh_offset, | |
2906 | shdr->sh_size, error_callback, data, | |
2907 | &debuglink_view)) | |
2908 | goto fail; | |
2909 | ||
2910 | debuglink_view_valid = 1; | |
2911 | debuglink_data = (const char *) debuglink_view.data; | |
2912 | crc_offset = strnlen (debuglink_data, shdr->sh_size); | |
2913 | crc_offset = (crc_offset + 3) & ~3; | |
2914 | if (crc_offset + 4 <= shdr->sh_size) | |
2915 | { | |
2916 | debuglink_name = debuglink_data; | |
2917 | debuglink_crc = *(const uint32_t*)(debuglink_data + crc_offset); | |
2918 | } | |
2919 | } | |
2920 | ||
ba9703b0 XL |
2921 | if (!debugaltlink_view_valid |
2922 | && strcmp (name, ".gnu_debugaltlink") == 0) | |
2923 | { | |
2924 | const char *debugaltlink_data; | |
2925 | size_t debugaltlink_name_len; | |
2926 | ||
2927 | if (!backtrace_get_view (state, descriptor, shdr->sh_offset, | |
2928 | shdr->sh_size, error_callback, data, | |
2929 | &debugaltlink_view)) | |
2930 | goto fail; | |
2931 | ||
2932 | debugaltlink_view_valid = 1; | |
2933 | debugaltlink_data = (const char *) debugaltlink_view.data; | |
2934 | debugaltlink_name = debugaltlink_data; | |
2935 | debugaltlink_name_len = strnlen (debugaltlink_data, shdr->sh_size); | |
2936 | if (debugaltlink_name_len < shdr->sh_size) | |
2937 | { | |
2938 | /* Include terminating zero. */ | |
2939 | debugaltlink_name_len += 1; | |
2940 | ||
2941 | debugaltlink_buildid_data | |
2942 | = debugaltlink_data + debugaltlink_name_len; | |
2943 | debugaltlink_buildid_size = shdr->sh_size - debugaltlink_name_len; | |
2944 | } | |
2945 | } | |
2946 | ||
94b46f34 XL |
2947 | /* Read the .opd section on PowerPC64 ELFv1. */ |
2948 | if (ehdr.e_machine == EM_PPC64 | |
2949 | && (ehdr.e_flags & EF_PPC64_ABI) < 2 | |
2950 | && shdr->sh_type == SHT_PROGBITS | |
2951 | && strcmp (name, ".opd") == 0) | |
2952 | { | |
2953 | if (!backtrace_get_view (state, descriptor, shdr->sh_offset, | |
2954 | shdr->sh_size, error_callback, data, | |
2955 | &opd_data.view)) | |
2956 | goto fail; | |
2957 | ||
2958 | opd = &opd_data; | |
2959 | opd->addr = shdr->sh_addr; | |
2960 | opd->data = (const char *) opd_data.view.data; | |
2961 | opd->size = shdr->sh_size; | |
2962 | } | |
1a4d82fc JJ |
2963 | } |
2964 | ||
2965 | if (symtab_shndx == 0) | |
2966 | symtab_shndx = dynsym_shndx; | |
94b46f34 | 2967 | if (symtab_shndx != 0 && !debuginfo) |
1a4d82fc JJ |
2968 | { |
2969 | const b_elf_shdr *symtab_shdr; | |
2970 | unsigned int strtab_shndx; | |
2971 | const b_elf_shdr *strtab_shdr; | |
2972 | struct elf_syminfo_data *sdata; | |
2973 | ||
2974 | symtab_shdr = &shdrs[symtab_shndx - 1]; | |
2975 | strtab_shndx = symtab_shdr->sh_link; | |
2976 | if (strtab_shndx >= shnum) | |
2977 | { | |
2978 | error_callback (data, | |
2979 | "ELF symbol table strtab link out of range", 0); | |
2980 | goto fail; | |
2981 | } | |
2982 | strtab_shdr = &shdrs[strtab_shndx - 1]; | |
2983 | ||
2984 | if (!backtrace_get_view (state, descriptor, symtab_shdr->sh_offset, | |
2985 | symtab_shdr->sh_size, error_callback, data, | |
2986 | &symtab_view)) | |
2987 | goto fail; | |
2988 | symtab_view_valid = 1; | |
2989 | ||
2990 | if (!backtrace_get_view (state, descriptor, strtab_shdr->sh_offset, | |
2991 | strtab_shdr->sh_size, error_callback, data, | |
2992 | &strtab_view)) | |
2993 | goto fail; | |
2994 | strtab_view_valid = 1; | |
2995 | ||
2996 | sdata = ((struct elf_syminfo_data *) | |
2997 | backtrace_alloc (state, sizeof *sdata, error_callback, data)); | |
2998 | if (sdata == NULL) | |
2999 | goto fail; | |
3000 | ||
3001 | if (!elf_initialize_syminfo (state, base_address, | |
3002 | symtab_view.data, symtab_shdr->sh_size, | |
3003 | strtab_view.data, strtab_shdr->sh_size, | |
94b46f34 | 3004 | error_callback, data, sdata, opd)) |
1a4d82fc JJ |
3005 | { |
3006 | backtrace_free (state, sdata, sizeof *sdata, error_callback, data); | |
3007 | goto fail; | |
3008 | } | |
3009 | ||
3010 | /* We no longer need the symbol table, but we hold on to the | |
3011 | string table permanently. */ | |
3012 | backtrace_release_view (state, &symtab_view, error_callback, data); | |
94b46f34 | 3013 | symtab_view_valid = 0; |
ba9703b0 | 3014 | strtab_view_valid = 0; |
1a4d82fc JJ |
3015 | |
3016 | *found_sym = 1; | |
3017 | ||
3018 | elf_add_syminfo_data (state, sdata); | |
3019 | } | |
3020 | ||
1a4d82fc JJ |
3021 | backtrace_release_view (state, &shdrs_view, error_callback, data); |
3022 | shdrs_view_valid = 0; | |
3023 | backtrace_release_view (state, &names_view, error_callback, data); | |
3024 | names_view_valid = 0; | |
3025 | ||
94b46f34 XL |
3026 | /* If the debug info is in a separate file, read that one instead. */ |
3027 | ||
3028 | if (buildid_data != NULL) | |
3029 | { | |
3030 | int d; | |
3031 | ||
3032 | d = elf_open_debugfile_by_buildid (state, buildid_data, buildid_size, | |
3033 | error_callback, data); | |
3034 | if (d >= 0) | |
3035 | { | |
3036 | int ret; | |
3037 | ||
3038 | backtrace_release_view (state, &buildid_view, error_callback, data); | |
3039 | if (debuglink_view_valid) | |
3040 | backtrace_release_view (state, &debuglink_view, error_callback, | |
3041 | data); | |
ba9703b0 XL |
3042 | if (debugaltlink_view_valid) |
3043 | backtrace_release_view (state, &debugaltlink_view, error_callback, | |
3044 | data); | |
3045 | ret = elf_add (state, "", d, base_address, error_callback, data, | |
3046 | fileline_fn, found_sym, found_dwarf, NULL, 0, 1, NULL, | |
3047 | 0); | |
94b46f34 XL |
3048 | if (ret < 0) |
3049 | backtrace_close (d, error_callback, data); | |
3050 | else | |
3051 | backtrace_close (descriptor, error_callback, data); | |
3052 | return ret; | |
3053 | } | |
3054 | } | |
3055 | ||
3056 | if (buildid_view_valid) | |
3057 | { | |
3058 | backtrace_release_view (state, &buildid_view, error_callback, data); | |
3059 | buildid_view_valid = 0; | |
3060 | } | |
3061 | ||
3062 | if (opd) | |
3063 | { | |
3064 | backtrace_release_view (state, &opd->view, error_callback, data); | |
3065 | opd = NULL; | |
3066 | } | |
3067 | ||
3068 | if (debuglink_name != NULL) | |
3069 | { | |
3070 | int d; | |
3071 | ||
3072 | d = elf_open_debugfile_by_debuglink (state, filename, debuglink_name, | |
3073 | debuglink_crc, error_callback, | |
3074 | data); | |
3075 | if (d >= 0) | |
3076 | { | |
3077 | int ret; | |
3078 | ||
3079 | backtrace_release_view (state, &debuglink_view, error_callback, | |
3080 | data); | |
ba9703b0 XL |
3081 | if (debugaltlink_view_valid) |
3082 | backtrace_release_view (state, &debugaltlink_view, error_callback, | |
3083 | data); | |
3084 | ret = elf_add (state, "", d, base_address, error_callback, data, | |
3085 | fileline_fn, found_sym, found_dwarf, NULL, 0, 1, NULL, | |
3086 | 0); | |
94b46f34 XL |
3087 | if (ret < 0) |
3088 | backtrace_close (d, error_callback, data); | |
3089 | else | |
3090 | backtrace_close(descriptor, error_callback, data); | |
3091 | return ret; | |
3092 | } | |
3093 | } | |
3094 | ||
3095 | if (debuglink_view_valid) | |
3096 | { | |
3097 | backtrace_release_view (state, &debuglink_view, error_callback, data); | |
3098 | debuglink_view_valid = 0; | |
3099 | } | |
3100 | ||
ba9703b0 XL |
3101 | struct dwarf_data *fileline_altlink = NULL; |
3102 | if (debugaltlink_name != NULL) | |
3103 | { | |
3104 | int d; | |
3105 | ||
3106 | d = elf_open_debugfile_by_debuglink (state, filename, debugaltlink_name, | |
3107 | 0, error_callback, data); | |
3108 | if (d >= 0) | |
3109 | { | |
3110 | int ret; | |
3111 | ||
3112 | ret = elf_add (state, filename, d, base_address, error_callback, data, | |
3113 | fileline_fn, found_sym, found_dwarf, &fileline_altlink, | |
3114 | 0, 1, debugaltlink_buildid_data, | |
3115 | debugaltlink_buildid_size); | |
3116 | backtrace_release_view (state, &debugaltlink_view, error_callback, | |
3117 | data); | |
3118 | debugaltlink_view_valid = 0; | |
3119 | if (ret < 0) | |
3120 | { | |
3121 | backtrace_close (d, error_callback, data); | |
3122 | return ret; | |
3123 | } | |
3124 | } | |
3125 | } | |
3126 | ||
3127 | if (debugaltlink_view_valid) | |
3128 | { | |
3129 | backtrace_release_view (state, &debugaltlink_view, error_callback, data); | |
3130 | debugaltlink_view_valid = 0; | |
3131 | } | |
3132 | ||
1a4d82fc | 3133 | /* Read all the debug sections in a single view, since they are |
ba9703b0 XL |
3134 | probably adjacent in the file. If any of sections are |
3135 | uncompressed, we never release this view. */ | |
1a4d82fc JJ |
3136 | |
3137 | min_offset = 0; | |
3138 | max_offset = 0; | |
ba9703b0 | 3139 | debug_size = 0; |
1a4d82fc JJ |
3140 | for (i = 0; i < (int) DEBUG_MAX; ++i) |
3141 | { | |
3142 | off_t end; | |
3143 | ||
ba9703b0 XL |
3144 | if (sections[i].size != 0) |
3145 | { | |
3146 | if (min_offset == 0 || sections[i].offset < min_offset) | |
3147 | min_offset = sections[i].offset; | |
3148 | end = sections[i].offset + sections[i].size; | |
3149 | if (end > max_offset) | |
3150 | max_offset = end; | |
3151 | debug_size += sections[i].size; | |
3152 | } | |
3153 | if (zsections[i].size != 0) | |
3154 | { | |
3155 | if (min_offset == 0 || zsections[i].offset < min_offset) | |
3156 | min_offset = zsections[i].offset; | |
3157 | end = zsections[i].offset + zsections[i].size; | |
3158 | if (end > max_offset) | |
3159 | max_offset = end; | |
3160 | debug_size += zsections[i].size; | |
3161 | } | |
1a4d82fc JJ |
3162 | } |
3163 | if (min_offset == 0 || max_offset == 0) | |
3164 | { | |
3165 | if (!backtrace_close (descriptor, error_callback, data)) | |
3166 | goto fail; | |
1a4d82fc JJ |
3167 | return 1; |
3168 | } | |
3169 | ||
ba9703b0 XL |
3170 | /* If the total debug section size is large, assume that there are |
3171 | gaps between the sections, and read them individually. */ | |
3172 | ||
3173 | if (max_offset - min_offset < 0x20000000 | |
3174 | || max_offset - min_offset < debug_size + 0x10000) | |
3175 | { | |
3176 | if (!backtrace_get_view (state, descriptor, min_offset, | |
3177 | max_offset - min_offset, | |
3178 | error_callback, data, &debug_view)) | |
3179 | goto fail; | |
3180 | debug_view_valid = 1; | |
3181 | } | |
3182 | else | |
3183 | { | |
3184 | memset (&split_debug_view[0], 0, sizeof split_debug_view); | |
3185 | for (i = 0; i < (int) DEBUG_MAX; ++i) | |
3186 | { | |
3187 | struct debug_section_info *dsec; | |
3188 | ||
3189 | if (sections[i].size != 0) | |
3190 | dsec = §ions[i]; | |
3191 | else if (zsections[i].size != 0) | |
3192 | dsec = &zsections[i]; | |
3193 | else | |
3194 | continue; | |
3195 | ||
3196 | if (!backtrace_get_view (state, descriptor, dsec->offset, dsec->size, | |
3197 | error_callback, data, &split_debug_view[i])) | |
3198 | goto fail; | |
3199 | split_debug_view_valid[i] = 1; | |
3200 | ||
3201 | if (sections[i].size != 0) | |
3202 | sections[i].data = ((const unsigned char *) | |
3203 | split_debug_view[i].data); | |
3204 | else | |
3205 | zsections[i].data = ((const unsigned char *) | |
3206 | split_debug_view[i].data); | |
3207 | } | |
3208 | } | |
1a4d82fc JJ |
3209 | |
3210 | /* We've read all we need from the executable. */ | |
3211 | if (!backtrace_close (descriptor, error_callback, data)) | |
3212 | goto fail; | |
3213 | descriptor = -1; | |
3214 | ||
94b46f34 | 3215 | using_debug_view = 0; |
ba9703b0 | 3216 | if (debug_view_valid) |
1a4d82fc | 3217 | { |
ba9703b0 | 3218 | for (i = 0; i < (int) DEBUG_MAX; ++i) |
94b46f34 | 3219 | { |
ba9703b0 XL |
3220 | if (sections[i].size == 0) |
3221 | sections[i].data = NULL; | |
3222 | else | |
3223 | { | |
3224 | sections[i].data = ((const unsigned char *) debug_view.data | |
3225 | + (sections[i].offset - min_offset)); | |
3226 | ++using_debug_view; | |
3227 | } | |
3228 | ||
3229 | if (zsections[i].size == 0) | |
3230 | zsections[i].data = NULL; | |
3231 | else | |
3232 | zsections[i].data = ((const unsigned char *) debug_view.data | |
3233 | + (zsections[i].offset - min_offset)); | |
94b46f34 XL |
3234 | } |
3235 | } | |
3236 | ||
3237 | /* Uncompress the old format (--compress-debug-sections=zlib-gnu). */ | |
3238 | ||
3239 | zdebug_table = NULL; | |
ba9703b0 | 3240 | for (i = 0; i < (int) DEBUG_MAX; ++i) |
94b46f34 | 3241 | { |
ba9703b0 | 3242 | if (sections[i].size == 0 && zsections[i].size > 0) |
94b46f34 XL |
3243 | { |
3244 | unsigned char *uncompressed_data; | |
3245 | size_t uncompressed_size; | |
3246 | ||
3247 | if (zdebug_table == NULL) | |
3248 | { | |
3249 | zdebug_table = ((uint16_t *) | |
3250 | backtrace_alloc (state, ZDEBUG_TABLE_SIZE, | |
3251 | error_callback, data)); | |
3252 | if (zdebug_table == NULL) | |
3253 | goto fail; | |
3254 | } | |
3255 | ||
3256 | uncompressed_data = NULL; | |
3257 | uncompressed_size = 0; | |
ba9703b0 XL |
3258 | if (!elf_uncompress_zdebug (state, zsections[i].data, |
3259 | zsections[i].size, zdebug_table, | |
94b46f34 XL |
3260 | error_callback, data, |
3261 | &uncompressed_data, &uncompressed_size)) | |
3262 | goto fail; | |
3263 | sections[i].data = uncompressed_data; | |
3264 | sections[i].size = uncompressed_size; | |
3265 | sections[i].compressed = 0; | |
ba9703b0 XL |
3266 | |
3267 | if (split_debug_view_valid[i]) | |
3268 | { | |
3269 | backtrace_release_view (state, &split_debug_view[i], | |
3270 | error_callback, data); | |
3271 | split_debug_view_valid[i] = 0; | |
3272 | } | |
94b46f34 XL |
3273 | } |
3274 | } | |
3275 | ||
3276 | /* Uncompress the official ELF format | |
3277 | (--compress-debug-sections=zlib-gabi). */ | |
ba9703b0 | 3278 | for (i = 0; i < (int) DEBUG_MAX; ++i) |
94b46f34 XL |
3279 | { |
3280 | unsigned char *uncompressed_data; | |
3281 | size_t uncompressed_size; | |
3282 | ||
3283 | if (sections[i].size == 0 || !sections[i].compressed) | |
3284 | continue; | |
3285 | ||
3286 | if (zdebug_table == NULL) | |
3287 | { | |
3288 | zdebug_table = ((uint16_t *) | |
3289 | backtrace_alloc (state, ZDEBUG_TABLE_SIZE, | |
3290 | error_callback, data)); | |
3291 | if (zdebug_table == NULL) | |
3292 | goto fail; | |
3293 | } | |
3294 | ||
3295 | uncompressed_data = NULL; | |
3296 | uncompressed_size = 0; | |
3297 | if (!elf_uncompress_chdr (state, sections[i].data, sections[i].size, | |
3298 | zdebug_table, error_callback, data, | |
3299 | &uncompressed_data, &uncompressed_size)) | |
3300 | goto fail; | |
3301 | sections[i].data = uncompressed_data; | |
3302 | sections[i].size = uncompressed_size; | |
3303 | sections[i].compressed = 0; | |
3304 | ||
ba9703b0 XL |
3305 | if (debug_view_valid) |
3306 | --using_debug_view; | |
3307 | else if (split_debug_view_valid[i]) | |
3308 | { | |
3309 | backtrace_release_view (state, &split_debug_view[i], | |
3310 | error_callback, data); | |
3311 | split_debug_view_valid[i] = 0; | |
3312 | } | |
94b46f34 XL |
3313 | } |
3314 | ||
3315 | if (zdebug_table != NULL) | |
3316 | backtrace_free (state, zdebug_table, ZDEBUG_TABLE_SIZE, | |
3317 | error_callback, data); | |
3318 | ||
3319 | if (debug_view_valid && using_debug_view == 0) | |
3320 | { | |
3321 | backtrace_release_view (state, &debug_view, error_callback, data); | |
3322 | debug_view_valid = 0; | |
1a4d82fc JJ |
3323 | } |
3324 | ||
ba9703b0 XL |
3325 | for (i = 0; i < (int) DEBUG_MAX; ++i) |
3326 | { | |
3327 | dwarf_sections.data[i] = sections[i].data; | |
3328 | dwarf_sections.size[i] = sections[i].size; | |
3329 | } | |
3330 | ||
3331 | if (!backtrace_dwarf_add (state, base_address, &dwarf_sections, | |
1a4d82fc | 3332 | ehdr.e_ident[EI_DATA] == ELFDATA2MSB, |
ba9703b0 XL |
3333 | fileline_altlink, |
3334 | error_callback, data, fileline_fn, | |
3335 | fileline_entry)) | |
1a4d82fc JJ |
3336 | goto fail; |
3337 | ||
3338 | *found_dwarf = 1; | |
3339 | ||
3340 | return 1; | |
3341 | ||
3342 | fail: | |
3343 | if (shdrs_view_valid) | |
3344 | backtrace_release_view (state, &shdrs_view, error_callback, data); | |
3345 | if (names_view_valid) | |
3346 | backtrace_release_view (state, &names_view, error_callback, data); | |
3347 | if (symtab_view_valid) | |
3348 | backtrace_release_view (state, &symtab_view, error_callback, data); | |
3349 | if (strtab_view_valid) | |
3350 | backtrace_release_view (state, &strtab_view, error_callback, data); | |
94b46f34 XL |
3351 | if (debuglink_view_valid) |
3352 | backtrace_release_view (state, &debuglink_view, error_callback, data); | |
ba9703b0 XL |
3353 | if (debugaltlink_view_valid) |
3354 | backtrace_release_view (state, &debugaltlink_view, error_callback, data); | |
94b46f34 XL |
3355 | if (buildid_view_valid) |
3356 | backtrace_release_view (state, &buildid_view, error_callback, data); | |
1a4d82fc JJ |
3357 | if (debug_view_valid) |
3358 | backtrace_release_view (state, &debug_view, error_callback, data); | |
ba9703b0 XL |
3359 | for (i = 0; i < (int) DEBUG_MAX; ++i) |
3360 | { | |
3361 | if (split_debug_view_valid[i]) | |
3362 | backtrace_release_view (state, &split_debug_view[i], | |
3363 | error_callback, data); | |
3364 | } | |
94b46f34 XL |
3365 | if (opd) |
3366 | backtrace_release_view (state, &opd->view, error_callback, data); | |
1a4d82fc JJ |
3367 | if (descriptor != -1) |
3368 | backtrace_close (descriptor, error_callback, data); | |
3369 | return 0; | |
3370 | } | |
3371 | ||
3372 | /* Data passed to phdr_callback. */ | |
3373 | ||
3374 | struct phdr_data | |
3375 | { | |
3376 | struct backtrace_state *state; | |
3377 | backtrace_error_callback error_callback; | |
3378 | void *data; | |
3379 | fileline *fileline_fn; | |
3380 | int *found_sym; | |
3381 | int *found_dwarf; | |
94b46f34 | 3382 | const char *exe_filename; |
1a4d82fc JJ |
3383 | int exe_descriptor; |
3384 | }; | |
3385 | ||
3386 | /* Callback passed to dl_iterate_phdr. Load debug info from shared | |
3387 | libraries. */ | |
3388 | ||
3389 | static int | |
a7813a04 XL |
3390 | #ifdef __i386__ |
3391 | __attribute__ ((__force_align_arg_pointer__)) | |
3392 | #endif | |
1a4d82fc JJ |
3393 | phdr_callback (struct dl_phdr_info *info, size_t size ATTRIBUTE_UNUSED, |
3394 | void *pdata) | |
3395 | { | |
3396 | struct phdr_data *pd = (struct phdr_data *) pdata; | |
94b46f34 | 3397 | const char *filename; |
1a4d82fc JJ |
3398 | int descriptor; |
3399 | int does_not_exist; | |
3400 | fileline elf_fileline_fn; | |
3401 | int found_dwarf; | |
3402 | ||
3403 | /* There is not much we can do if we don't have the module name, | |
3404 | unless executable is ET_DYN, where we expect the very first | |
3405 | phdr_callback to be for the PIE. */ | |
3406 | if (info->dlpi_name == NULL || info->dlpi_name[0] == '\0') | |
3407 | { | |
3408 | if (pd->exe_descriptor == -1) | |
3409 | return 0; | |
94b46f34 | 3410 | filename = pd->exe_filename; |
1a4d82fc JJ |
3411 | descriptor = pd->exe_descriptor; |
3412 | pd->exe_descriptor = -1; | |
3413 | } | |
3414 | else | |
3415 | { | |
3416 | if (pd->exe_descriptor != -1) | |
3417 | { | |
3418 | backtrace_close (pd->exe_descriptor, pd->error_callback, pd->data); | |
3419 | pd->exe_descriptor = -1; | |
3420 | } | |
3421 | ||
94b46f34 | 3422 | filename = info->dlpi_name; |
1a4d82fc JJ |
3423 | descriptor = backtrace_open (info->dlpi_name, pd->error_callback, |
3424 | pd->data, &does_not_exist); | |
3425 | if (descriptor < 0) | |
3426 | return 0; | |
3427 | } | |
3428 | ||
94b46f34 XL |
3429 | if (elf_add (pd->state, filename, descriptor, info->dlpi_addr, |
3430 | pd->error_callback, pd->data, &elf_fileline_fn, pd->found_sym, | |
ba9703b0 | 3431 | &found_dwarf, NULL, 0, 0, NULL, 0)) |
1a4d82fc JJ |
3432 | { |
3433 | if (found_dwarf) | |
3434 | { | |
3435 | *pd->found_dwarf = 1; | |
3436 | *pd->fileline_fn = elf_fileline_fn; | |
3437 | } | |
3438 | } | |
3439 | ||
3440 | return 0; | |
3441 | } | |
3442 | ||
3443 | /* Initialize the backtrace data we need from an ELF executable. At | |
3444 | the ELF level, all we need to do is find the debug info | |
3445 | sections. */ | |
3446 | ||
3447 | int | |
94b46f34 XL |
3448 | backtrace_initialize (struct backtrace_state *state, const char *filename, |
3449 | int descriptor, backtrace_error_callback error_callback, | |
1a4d82fc JJ |
3450 | void *data, fileline *fileline_fn) |
3451 | { | |
3452 | int ret; | |
3453 | int found_sym; | |
3454 | int found_dwarf; | |
a7813a04 | 3455 | fileline elf_fileline_fn = elf_nodebug; |
1a4d82fc JJ |
3456 | struct phdr_data pd; |
3457 | ||
94b46f34 | 3458 | ret = elf_add (state, filename, descriptor, 0, error_callback, data, |
ba9703b0 XL |
3459 | &elf_fileline_fn, &found_sym, &found_dwarf, NULL, 1, 0, NULL, |
3460 | 0); | |
1a4d82fc JJ |
3461 | if (!ret) |
3462 | return 0; | |
3463 | ||
3464 | pd.state = state; | |
3465 | pd.error_callback = error_callback; | |
3466 | pd.data = data; | |
3467 | pd.fileline_fn = &elf_fileline_fn; | |
3468 | pd.found_sym = &found_sym; | |
3469 | pd.found_dwarf = &found_dwarf; | |
94b46f34 | 3470 | pd.exe_filename = filename; |
1a4d82fc JJ |
3471 | pd.exe_descriptor = ret < 0 ? descriptor : -1; |
3472 | ||
3473 | dl_iterate_phdr (phdr_callback, (void *) &pd); | |
3474 | ||
3475 | if (!state->threaded) | |
3476 | { | |
3477 | if (found_sym) | |
3478 | state->syminfo_fn = elf_syminfo; | |
3479 | else if (state->syminfo_fn == NULL) | |
3480 | state->syminfo_fn = elf_nosyms; | |
3481 | } | |
3482 | else | |
3483 | { | |
3484 | if (found_sym) | |
3485 | backtrace_atomic_store_pointer (&state->syminfo_fn, elf_syminfo); | |
3486 | else | |
9cc50fc6 SL |
3487 | (void) __sync_bool_compare_and_swap (&state->syminfo_fn, NULL, |
3488 | elf_nosyms); | |
1a4d82fc JJ |
3489 | } |
3490 | ||
3491 | if (!state->threaded) | |
94b46f34 | 3492 | *fileline_fn = state->fileline_fn; |
1a4d82fc | 3493 | else |
94b46f34 | 3494 | *fileline_fn = backtrace_atomic_load_pointer (&state->fileline_fn); |
1a4d82fc | 3495 | |
94b46f34 XL |
3496 | if (*fileline_fn == NULL || *fileline_fn == elf_nodebug) |
3497 | *fileline_fn = elf_fileline_fn; | |
1a4d82fc JJ |
3498 | |
3499 | return 1; | |
3500 | } |