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ffa54e5c | 1 | /* simple-object-elf.c -- routines to manipulate ELF object files. |
2a8ae714 | 2 | Copyright (C) 2010-2018 Free Software Foundation, Inc. |
ffa54e5c DD |
3 | Written by Ian Lance Taylor, Google. |
4 | ||
5 | This program is free software; you can redistribute it and/or modify it | |
6 | under the terms of the GNU General Public License as published by the | |
7 | Free Software Foundation; either version 2, or (at your option) any | |
8 | later version. | |
9 | ||
10 | This program is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | GNU General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU General Public License | |
16 | along with this program; if not, write to the Free Software | |
17 | Foundation, 51 Franklin Street - Fifth Floor, | |
18 | Boston, MA 02110-1301, USA. */ | |
19 | ||
20 | #include "config.h" | |
21 | #include "libiberty.h" | |
22 | #include "simple-object.h" | |
23 | ||
24 | #include <errno.h> | |
25 | #include <stddef.h> | |
26 | ||
27 | #ifdef HAVE_STDLIB_H | |
28 | #include <stdlib.h> | |
29 | #endif | |
30 | ||
31 | #ifdef HAVE_STDINT_H | |
32 | #include <stdint.h> | |
33 | #endif | |
34 | ||
35 | #ifdef HAVE_STRING_H | |
36 | #include <string.h> | |
37 | #endif | |
38 | ||
39 | #ifdef HAVE_INTTYPES_H | |
40 | #include <inttypes.h> | |
41 | #endif | |
42 | ||
43 | #include "simple-object-common.h" | |
44 | ||
45 | /* ELF structures and constants. */ | |
46 | ||
47 | /* 32-bit ELF file header. */ | |
48 | ||
49 | typedef struct { | |
50 | unsigned char e_ident[16]; /* ELF "magic number" */ | |
51 | unsigned char e_type[2]; /* Identifies object file type */ | |
52 | unsigned char e_machine[2]; /* Specifies required architecture */ | |
53 | unsigned char e_version[4]; /* Identifies object file version */ | |
54 | unsigned char e_entry[4]; /* Entry point virtual address */ | |
55 | unsigned char e_phoff[4]; /* Program header table file offset */ | |
56 | unsigned char e_shoff[4]; /* Section header table file offset */ | |
57 | unsigned char e_flags[4]; /* Processor-specific flags */ | |
58 | unsigned char e_ehsize[2]; /* ELF header size in bytes */ | |
59 | unsigned char e_phentsize[2]; /* Program header table entry size */ | |
60 | unsigned char e_phnum[2]; /* Program header table entry count */ | |
61 | unsigned char e_shentsize[2]; /* Section header table entry size */ | |
62 | unsigned char e_shnum[2]; /* Section header table entry count */ | |
63 | unsigned char e_shstrndx[2]; /* Section header string table index */ | |
64 | } Elf32_External_Ehdr; | |
65 | ||
66 | /* 64-bit ELF file header. */ | |
67 | ||
68 | typedef struct { | |
69 | unsigned char e_ident[16]; /* ELF "magic number" */ | |
70 | unsigned char e_type[2]; /* Identifies object file type */ | |
71 | unsigned char e_machine[2]; /* Specifies required architecture */ | |
72 | unsigned char e_version[4]; /* Identifies object file version */ | |
73 | unsigned char e_entry[8]; /* Entry point virtual address */ | |
74 | unsigned char e_phoff[8]; /* Program header table file offset */ | |
75 | unsigned char e_shoff[8]; /* Section header table file offset */ | |
76 | unsigned char e_flags[4]; /* Processor-specific flags */ | |
77 | unsigned char e_ehsize[2]; /* ELF header size in bytes */ | |
78 | unsigned char e_phentsize[2]; /* Program header table entry size */ | |
79 | unsigned char e_phnum[2]; /* Program header table entry count */ | |
80 | unsigned char e_shentsize[2]; /* Section header table entry size */ | |
81 | unsigned char e_shnum[2]; /* Section header table entry count */ | |
82 | unsigned char e_shstrndx[2]; /* Section header string table index */ | |
83 | } Elf64_External_Ehdr; | |
84 | ||
85 | /* Indexes and values in e_ident field of Ehdr. */ | |
86 | ||
87 | #define EI_MAG0 0 /* File identification byte 0 index */ | |
88 | #define ELFMAG0 0x7F /* Magic number byte 0 */ | |
89 | ||
90 | #define EI_MAG1 1 /* File identification byte 1 index */ | |
91 | #define ELFMAG1 'E' /* Magic number byte 1 */ | |
92 | ||
93 | #define EI_MAG2 2 /* File identification byte 2 index */ | |
94 | #define ELFMAG2 'L' /* Magic number byte 2 */ | |
95 | ||
96 | #define EI_MAG3 3 /* File identification byte 3 index */ | |
97 | #define ELFMAG3 'F' /* Magic number byte 3 */ | |
98 | ||
99 | #define EI_CLASS 4 /* File class */ | |
100 | #define ELFCLASSNONE 0 /* Invalid class */ | |
101 | #define ELFCLASS32 1 /* 32-bit objects */ | |
102 | #define ELFCLASS64 2 /* 64-bit objects */ | |
103 | ||
104 | #define EI_DATA 5 /* Data encoding */ | |
105 | #define ELFDATANONE 0 /* Invalid data encoding */ | |
106 | #define ELFDATA2LSB 1 /* 2's complement, little endian */ | |
107 | #define ELFDATA2MSB 2 /* 2's complement, big endian */ | |
108 | ||
109 | #define EI_VERSION 6 /* File version */ | |
110 | #define EV_CURRENT 1 /* Current version */ | |
111 | ||
112 | #define EI_OSABI 7 /* Operating System/ABI indication */ | |
113 | ||
114 | /* Values for e_type field of Ehdr. */ | |
115 | ||
116 | #define ET_REL 1 /* Relocatable file */ | |
117 | ||
f9e6589d DD |
118 | /* Values for e_machine field of Ehdr. */ |
119 | ||
120 | #define EM_SPARC 2 /* SUN SPARC */ | |
121 | #define EM_SPARC32PLUS 18 /* Sun's "v8plus" */ | |
122 | ||
ffa54e5c DD |
123 | /* Special section index values. */ |
124 | ||
f8ad2513 | 125 | #define SHN_UNDEF 0 /* Undefined section */ |
ffa54e5c | 126 | #define SHN_LORESERVE 0xFF00 /* Begin range of reserved indices */ |
f8ad2513 | 127 | #define SHN_COMMON 0xFFF2 /* Associated symbol is in common */ |
ffa54e5c DD |
128 | #define SHN_XINDEX 0xFFFF /* Section index is held elsewhere */ |
129 | ||
f8ad2513 | 130 | |
ffa54e5c DD |
131 | /* 32-bit ELF program header. */ |
132 | ||
133 | typedef struct { | |
134 | unsigned char p_type[4]; /* Identifies program segment type */ | |
135 | unsigned char p_offset[4]; /* Segment file offset */ | |
136 | unsigned char p_vaddr[4]; /* Segment virtual address */ | |
137 | unsigned char p_paddr[4]; /* Segment physical address */ | |
138 | unsigned char p_filesz[4]; /* Segment size in file */ | |
139 | unsigned char p_memsz[4]; /* Segment size in memory */ | |
140 | unsigned char p_flags[4]; /* Segment flags */ | |
141 | unsigned char p_align[4]; /* Segment alignment, file & memory */ | |
142 | } Elf32_External_Phdr; | |
143 | ||
144 | /* 64-bit ELF program header. */ | |
145 | ||
146 | typedef struct { | |
147 | unsigned char p_type[4]; /* Identifies program segment type */ | |
148 | unsigned char p_flags[4]; /* Segment flags */ | |
149 | unsigned char p_offset[8]; /* Segment file offset */ | |
150 | unsigned char p_vaddr[8]; /* Segment virtual address */ | |
151 | unsigned char p_paddr[8]; /* Segment physical address */ | |
152 | unsigned char p_filesz[8]; /* Segment size in file */ | |
153 | unsigned char p_memsz[8]; /* Segment size in memory */ | |
154 | unsigned char p_align[8]; /* Segment alignment, file & memory */ | |
155 | } Elf64_External_Phdr; | |
156 | ||
157 | /* 32-bit ELF section header */ | |
158 | ||
159 | typedef struct { | |
160 | unsigned char sh_name[4]; /* Section name, index in string tbl */ | |
161 | unsigned char sh_type[4]; /* Type of section */ | |
162 | unsigned char sh_flags[4]; /* Miscellaneous section attributes */ | |
163 | unsigned char sh_addr[4]; /* Section virtual addr at execution */ | |
164 | unsigned char sh_offset[4]; /* Section file offset */ | |
165 | unsigned char sh_size[4]; /* Size of section in bytes */ | |
166 | unsigned char sh_link[4]; /* Index of another section */ | |
167 | unsigned char sh_info[4]; /* Additional section information */ | |
168 | unsigned char sh_addralign[4]; /* Section alignment */ | |
169 | unsigned char sh_entsize[4]; /* Entry size if section holds table */ | |
170 | } Elf32_External_Shdr; | |
171 | ||
172 | /* 64-bit ELF section header. */ | |
173 | ||
174 | typedef struct { | |
175 | unsigned char sh_name[4]; /* Section name, index in string tbl */ | |
176 | unsigned char sh_type[4]; /* Type of section */ | |
177 | unsigned char sh_flags[8]; /* Miscellaneous section attributes */ | |
178 | unsigned char sh_addr[8]; /* Section virtual addr at execution */ | |
179 | unsigned char sh_offset[8]; /* Section file offset */ | |
180 | unsigned char sh_size[8]; /* Size of section in bytes */ | |
181 | unsigned char sh_link[4]; /* Index of another section */ | |
182 | unsigned char sh_info[4]; /* Additional section information */ | |
183 | unsigned char sh_addralign[8]; /* Section alignment */ | |
184 | unsigned char sh_entsize[8]; /* Entry size if section holds table */ | |
185 | } Elf64_External_Shdr; | |
186 | ||
187 | /* Values for sh_type field. */ | |
188 | ||
f8ad2513 | 189 | #define SHT_NULL 0 /* Section header table entry unused */ |
ffa54e5c | 190 | #define SHT_PROGBITS 1 /* Program data */ |
f8ad2513 | 191 | #define SHT_SYMTAB 2 /* Link editing symbol table */ |
ffa54e5c | 192 | #define SHT_STRTAB 3 /* A string table */ |
f8ad2513 NC |
193 | #define SHT_RELA 4 /* Relocation entries with addends */ |
194 | #define SHT_REL 9 /* Relocation entries, no addends */ | |
195 | #define SHT_GROUP 17 /* Section contains a section group */ | |
196 | ||
197 | /* Values for sh_flags field. */ | |
198 | ||
2a8ae714 | 199 | #define SHF_EXECINSTR 0x00000004 /* Executable section. */ |
f8ad2513 NC |
200 | #define SHF_EXCLUDE 0x80000000 /* Link editor is to exclude this |
201 | section from executable and | |
202 | shared library that it builds | |
203 | when those objects are not to be | |
204 | further relocated. */ | |
205 | /* Symbol table entry. */ | |
206 | ||
207 | typedef struct | |
208 | { | |
209 | unsigned char st_name[4]; /* Symbol name (string tbl index) */ | |
210 | unsigned char st_value[4]; /* Symbol value */ | |
211 | unsigned char st_size[4]; /* Symbol size */ | |
212 | unsigned char st_info; /* Symbol type and binding */ | |
213 | unsigned char st_other; /* Symbol visibility */ | |
214 | unsigned char st_shndx[2]; /* Section index */ | |
215 | } Elf32_External_Sym; | |
216 | ||
217 | typedef struct | |
218 | { | |
219 | unsigned char st_name[4]; /* Symbol name (string tbl index) */ | |
220 | unsigned char st_info; /* Symbol type and binding */ | |
221 | unsigned char st_other; /* Symbol visibility */ | |
222 | unsigned char st_shndx[2]; /* Section index */ | |
223 | unsigned char st_value[8]; /* Symbol value */ | |
224 | unsigned char st_size[8]; /* Symbol size */ | |
225 | } Elf64_External_Sym; | |
226 | ||
227 | #define ELF_ST_BIND(val) (((unsigned char) (val)) >> 4) | |
228 | #define ELF_ST_TYPE(val) ((val) & 0xf) | |
229 | #define ELF_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf)) | |
230 | ||
231 | #define STT_NOTYPE 0 /* Symbol type is unspecified */ | |
232 | #define STT_OBJECT 1 /* Symbol is a data object */ | |
233 | #define STT_FUNC 2 /* Symbol is a code object */ | |
234 | #define STT_TLS 6 /* Thread local data object */ | |
235 | #define STT_GNU_IFUNC 10 /* Symbol is an indirect code object */ | |
236 | ||
237 | #define STB_LOCAL 0 /* Local symbol */ | |
238 | #define STB_GLOBAL 1 /* Global symbol */ | |
2a8ae714 | 239 | #define STB_WEAK 2 /* Weak global */ |
f8ad2513 NC |
240 | |
241 | #define STV_DEFAULT 0 /* Visibility is specified by binding type */ | |
2a8ae714 | 242 | #define STV_HIDDEN 2 /* Can only be seen inside currect component */ |
ffa54e5c DD |
243 | |
244 | /* Functions to fetch and store different ELF types, depending on the | |
245 | endianness and size. */ | |
246 | ||
247 | struct elf_type_functions | |
248 | { | |
249 | unsigned short (*fetch_Elf_Half) (const unsigned char *); | |
250 | unsigned int (*fetch_Elf_Word) (const unsigned char *); | |
251 | ulong_type (*fetch_Elf_Addr) (const unsigned char *); | |
252 | void (*set_Elf_Half) (unsigned char *, unsigned short); | |
253 | void (*set_Elf_Word) (unsigned char *, unsigned int); | |
254 | void (*set_Elf_Addr) (unsigned char *, ulong_type); | |
255 | }; | |
256 | ||
257 | static const struct elf_type_functions elf_big_32_functions = | |
258 | { | |
259 | simple_object_fetch_big_16, | |
260 | simple_object_fetch_big_32, | |
261 | simple_object_fetch_big_32_ulong, | |
262 | simple_object_set_big_16, | |
263 | simple_object_set_big_32, | |
264 | simple_object_set_big_32_ulong | |
265 | }; | |
266 | ||
267 | static const struct elf_type_functions elf_little_32_functions = | |
268 | { | |
269 | simple_object_fetch_little_16, | |
270 | simple_object_fetch_little_32, | |
271 | simple_object_fetch_little_32_ulong, | |
272 | simple_object_set_little_16, | |
273 | simple_object_set_little_32, | |
274 | simple_object_set_little_32_ulong | |
275 | }; | |
276 | ||
277 | #ifdef UNSIGNED_64BIT_TYPE | |
278 | ||
279 | static const struct elf_type_functions elf_big_64_functions = | |
280 | { | |
281 | simple_object_fetch_big_16, | |
282 | simple_object_fetch_big_32, | |
283 | simple_object_fetch_big_64, | |
284 | simple_object_set_big_16, | |
285 | simple_object_set_big_32, | |
286 | simple_object_set_big_64 | |
287 | }; | |
288 | ||
289 | static const struct elf_type_functions elf_little_64_functions = | |
290 | { | |
291 | simple_object_fetch_little_16, | |
292 | simple_object_fetch_little_32, | |
293 | simple_object_fetch_little_64, | |
294 | simple_object_set_little_16, | |
295 | simple_object_set_little_32, | |
296 | simple_object_set_little_64 | |
297 | }; | |
298 | ||
299 | #endif | |
300 | ||
301 | /* Hideous macro to fetch the value of a field from an external ELF | |
302 | struct of some sort. TYPEFUNCS is the set of type functions. | |
303 | BUFFER points to the external data. STRUCTTYPE is the appropriate | |
304 | struct type. FIELD is a field within the struct. TYPE is the type | |
305 | of the field in the struct: Elf_Half, Elf_Word, or Elf_Addr. */ | |
306 | ||
307 | #define ELF_FETCH_STRUCT_FIELD(TYPEFUNCS, STRUCTTYPE, FIELD, BUFFER, TYPE) \ | |
308 | ((TYPEFUNCS)->fetch_ ## TYPE ((BUFFER) + offsetof (STRUCTTYPE, FIELD))) | |
309 | ||
310 | /* Even more hideous macro to fetch the value of FIELD from BUFFER. | |
311 | SIZE is 32 or 64. STRUCTTYPE is the name of the struct from | |
312 | elf/external.h: Ehdr, Shdr, etc. FIELD is the name of a field in | |
313 | the struct. TYPE is the type of the field in the struct: Elf_Half, | |
314 | Elf_Word, or Elf_Addr. */ | |
315 | ||
316 | #define ELF_FETCH_SIZED_FIELD(TYPEFUNCS, SIZE, STRUCTTYPE, BUFFER, \ | |
317 | FIELD, TYPE) \ | |
318 | ELF_FETCH_STRUCT_FIELD (TYPEFUNCS, \ | |
319 | Elf ## SIZE ## _External_ ## STRUCTTYPE, \ | |
320 | FIELD, BUFFER, TYPE) | |
321 | ||
322 | /* Like ELF_FETCH_SIZED_FIELD but taking an ELFCLASS value. */ | |
323 | ||
324 | #define ELF_FETCH_FIELD(TYPEFUNCS, CLASS, STRUCTTYPE, BUFFER, \ | |
325 | FIELD, TYPE) \ | |
326 | ((CLASS) == ELFCLASS32 \ | |
327 | ? ELF_FETCH_SIZED_FIELD (TYPEFUNCS, 32, STRUCTTYPE, BUFFER, FIELD, \ | |
328 | TYPE) \ | |
329 | : ELF_FETCH_SIZED_FIELD (TYPEFUNCS, 64, STRUCTTYPE, BUFFER, FIELD, \ | |
330 | TYPE)) | |
331 | ||
332 | /* Hideous macro to set the value of a field in an external ELF | |
333 | structure to VAL. TYPEFUNCS is the set of type functions. BUFFER | |
334 | points to the external data. STRUCTTYPE is the appropriate | |
335 | structure type. FIELD is a field within the struct. TYPE is the | |
336 | type of the field in the struct: Elf_Half, Elf_Word, or | |
337 | Elf_Addr. */ | |
338 | ||
339 | #define ELF_SET_STRUCT_FIELD(TYPEFUNCS, STRUCTTYPE, FIELD, BUFFER, TYPE, VAL) \ | |
340 | (TYPEFUNCS)->set_ ## TYPE ((BUFFER) + offsetof (STRUCTTYPE, FIELD), (VAL)) | |
341 | ||
342 | /* Even more hideous macro to set the value of FIELD in BUFFER to VAL. | |
343 | SIZE is 32 or 64. STRUCTTYPE is the name of the struct from | |
344 | elf/external.h: Ehdr, Shdr, etc. FIELD is the name of a field in | |
345 | the struct. TYPE is the type of the field in the struct: Elf_Half, | |
346 | Elf_Word, or Elf_Addr. */ | |
347 | ||
348 | #define ELF_SET_SIZED_FIELD(TYPEFUNCS, SIZE, STRUCTTYPE, BUFFER, FIELD, \ | |
349 | TYPE, VAL) \ | |
350 | ELF_SET_STRUCT_FIELD (TYPEFUNCS, \ | |
351 | Elf ## SIZE ## _External_ ## STRUCTTYPE, \ | |
352 | FIELD, BUFFER, TYPE, VAL) | |
353 | ||
354 | /* Like ELF_SET_SIZED_FIELD but taking an ELFCLASS value. */ | |
355 | ||
356 | #define ELF_SET_FIELD(TYPEFUNCS, CLASS, STRUCTTYPE, BUFFER, FIELD, \ | |
357 | TYPE, VAL) \ | |
358 | ((CLASS) == ELFCLASS32 \ | |
359 | ? ELF_SET_SIZED_FIELD (TYPEFUNCS, 32, STRUCTTYPE, BUFFER, FIELD, \ | |
360 | TYPE, VAL) \ | |
361 | : ELF_SET_SIZED_FIELD (TYPEFUNCS, 64, STRUCTTYPE, BUFFER, FIELD, \ | |
362 | TYPE, VAL)) | |
363 | ||
364 | /* Private data for an simple_object_read. */ | |
365 | ||
366 | struct simple_object_elf_read | |
367 | { | |
368 | /* Type functions. */ | |
369 | const struct elf_type_functions* type_functions; | |
370 | /* Elf data. */ | |
371 | unsigned char ei_data; | |
372 | /* Elf class. */ | |
373 | unsigned char ei_class; | |
374 | /* ELF OS ABI. */ | |
375 | unsigned char ei_osabi; | |
376 | /* Elf machine number. */ | |
377 | unsigned short machine; | |
378 | /* Processor specific flags. */ | |
379 | unsigned int flags; | |
380 | /* File offset of section headers. */ | |
381 | ulong_type shoff; | |
382 | /* Number of sections. */ | |
383 | unsigned int shnum; | |
384 | /* Index of string table section header. */ | |
385 | unsigned int shstrndx; | |
386 | }; | |
387 | ||
388 | /* Private data for an simple_object_attributes. */ | |
389 | ||
390 | struct simple_object_elf_attributes | |
391 | { | |
392 | /* Type functions. */ | |
393 | const struct elf_type_functions* type_functions; | |
394 | /* Elf data. */ | |
395 | unsigned char ei_data; | |
396 | /* Elf class. */ | |
397 | unsigned char ei_class; | |
398 | /* ELF OS ABI. */ | |
399 | unsigned char ei_osabi; | |
400 | /* Elf machine number. */ | |
401 | unsigned short machine; | |
402 | /* Processor specific flags. */ | |
403 | unsigned int flags; | |
404 | }; | |
405 | ||
f8ad2513 NC |
406 | /* Private data for an simple_object_write. */ |
407 | ||
408 | struct simple_object_elf_write | |
409 | { | |
410 | struct simple_object_elf_attributes attrs; | |
411 | unsigned char *shdrs; | |
412 | }; | |
413 | ||
ffa54e5c DD |
414 | /* See if we have an ELF file. */ |
415 | ||
416 | static void * | |
417 | simple_object_elf_match (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN], | |
418 | int descriptor, off_t offset, | |
419 | const char *segment_name ATTRIBUTE_UNUSED, | |
420 | const char **errmsg, int *err) | |
421 | { | |
422 | unsigned char ei_data; | |
423 | unsigned char ei_class; | |
424 | const struct elf_type_functions *type_functions; | |
425 | unsigned char ehdr[sizeof (Elf64_External_Ehdr)]; | |
426 | struct simple_object_elf_read *eor; | |
427 | ||
428 | if (header[EI_MAG0] != ELFMAG0 | |
429 | || header[EI_MAG1] != ELFMAG1 | |
430 | || header[EI_MAG2] != ELFMAG2 | |
431 | || header[EI_MAG3] != ELFMAG3 | |
432 | || header[EI_VERSION] != EV_CURRENT) | |
433 | { | |
434 | *errmsg = NULL; | |
435 | *err = 0; | |
436 | return NULL; | |
437 | } | |
438 | ||
439 | ei_data = header[EI_DATA]; | |
440 | if (ei_data != ELFDATA2LSB && ei_data != ELFDATA2MSB) | |
441 | { | |
442 | *errmsg = "unknown ELF endianness"; | |
443 | *err = 0; | |
444 | return NULL; | |
445 | } | |
446 | ||
447 | ei_class = header[EI_CLASS]; | |
448 | switch (ei_class) | |
449 | { | |
450 | case ELFCLASS32: | |
451 | type_functions = (ei_data == ELFDATA2LSB | |
452 | ? &elf_little_32_functions | |
453 | : &elf_big_32_functions); | |
454 | break; | |
455 | ||
456 | case ELFCLASS64: | |
457 | #ifndef UNSIGNED_64BIT_TYPE | |
458 | *errmsg = "64-bit ELF objects not supported"; | |
459 | *err = 0; | |
460 | return NULL; | |
461 | #else | |
462 | type_functions = (ei_data == ELFDATA2LSB | |
463 | ? &elf_little_64_functions | |
464 | : &elf_big_64_functions); | |
465 | break; | |
466 | #endif | |
467 | ||
468 | default: | |
469 | *errmsg = "unrecognized ELF size"; | |
470 | *err = 0; | |
471 | return NULL; | |
472 | } | |
473 | ||
474 | if (!simple_object_internal_read (descriptor, offset, ehdr, sizeof ehdr, | |
475 | errmsg, err)) | |
476 | return NULL; | |
477 | ||
478 | eor = XNEW (struct simple_object_elf_read); | |
479 | eor->type_functions = type_functions; | |
480 | eor->ei_data = ei_data; | |
481 | eor->ei_class = ei_class; | |
482 | eor->ei_osabi = header[EI_OSABI]; | |
483 | eor->machine = ELF_FETCH_FIELD (type_functions, ei_class, Ehdr, ehdr, | |
484 | e_machine, Elf_Half); | |
485 | eor->flags = ELF_FETCH_FIELD (type_functions, ei_class, Ehdr, ehdr, | |
486 | e_flags, Elf_Word); | |
487 | eor->shoff = ELF_FETCH_FIELD (type_functions, ei_class, Ehdr, ehdr, | |
488 | e_shoff, Elf_Addr); | |
489 | eor->shnum = ELF_FETCH_FIELD (type_functions, ei_class, Ehdr, ehdr, | |
490 | e_shnum, Elf_Half); | |
491 | eor->shstrndx = ELF_FETCH_FIELD (type_functions, ei_class, Ehdr, ehdr, | |
492 | e_shstrndx, Elf_Half); | |
493 | ||
494 | if ((eor->shnum == 0 || eor->shstrndx == SHN_XINDEX) | |
495 | && eor->shoff != 0) | |
496 | { | |
497 | unsigned char shdr[sizeof (Elf64_External_Shdr)]; | |
498 | ||
499 | /* Object file has more than 0xffff sections. */ | |
500 | ||
501 | if (!simple_object_internal_read (descriptor, offset + eor->shoff, shdr, | |
502 | (ei_class == ELFCLASS32 | |
503 | ? sizeof (Elf32_External_Shdr) | |
504 | : sizeof (Elf64_External_Shdr)), | |
505 | errmsg, err)) | |
506 | { | |
507 | XDELETE (eor); | |
508 | return NULL; | |
509 | } | |
510 | ||
511 | if (eor->shnum == 0) | |
512 | eor->shnum = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
513 | shdr, sh_size, Elf_Addr); | |
514 | ||
515 | if (eor->shstrndx == SHN_XINDEX) | |
516 | { | |
517 | eor->shstrndx = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
518 | shdr, sh_link, Elf_Word); | |
519 | ||
520 | /* Versions of the GNU binutils between 2.12 and 2.18 did | |
521 | not handle objects with more than SHN_LORESERVE sections | |
522 | correctly. All large section indexes were offset by | |
523 | 0x100. There is more information at | |
524 | http://sourceware.org/bugzilla/show_bug.cgi?id-5900 . | |
525 | Fortunately these object files are easy to detect, as the | |
526 | GNU binutils always put the section header string table | |
527 | near the end of the list of sections. Thus if the | |
528 | section header string table index is larger than the | |
529 | number of sections, then we know we have to subtract | |
530 | 0x100 to get the real section index. */ | |
531 | if (eor->shstrndx >= eor->shnum | |
532 | && eor->shstrndx >= SHN_LORESERVE + 0x100) | |
533 | eor->shstrndx -= 0x100; | |
534 | } | |
535 | } | |
536 | ||
537 | if (eor->shstrndx >= eor->shnum) | |
538 | { | |
539 | *errmsg = "invalid ELF shstrndx >= shnum"; | |
540 | *err = 0; | |
541 | XDELETE (eor); | |
542 | return NULL; | |
543 | } | |
544 | ||
545 | return (void *) eor; | |
546 | } | |
547 | ||
548 | /* Find all sections in an ELF file. */ | |
549 | ||
550 | static const char * | |
551 | simple_object_elf_find_sections (simple_object_read *sobj, | |
552 | int (*pfn) (void *, const char *, | |
553 | off_t offset, off_t length), | |
554 | void *data, | |
555 | int *err) | |
556 | { | |
557 | struct simple_object_elf_read *eor = | |
558 | (struct simple_object_elf_read *) sobj->data; | |
559 | const struct elf_type_functions *type_functions = eor->type_functions; | |
560 | unsigned char ei_class = eor->ei_class; | |
561 | size_t shdr_size; | |
562 | unsigned int shnum; | |
563 | unsigned char *shdrs; | |
564 | const char *errmsg; | |
565 | unsigned char *shstrhdr; | |
566 | size_t name_size; | |
567 | off_t shstroff; | |
568 | unsigned char *names; | |
569 | unsigned int i; | |
570 | ||
571 | shdr_size = (ei_class == ELFCLASS32 | |
572 | ? sizeof (Elf32_External_Shdr) | |
573 | : sizeof (Elf64_External_Shdr)); | |
574 | ||
575 | /* Read the section headers. We skip section 0, which is not a | |
576 | useful section. */ | |
577 | ||
578 | shnum = eor->shnum; | |
579 | shdrs = XNEWVEC (unsigned char, shdr_size * (shnum - 1)); | |
580 | ||
581 | if (!simple_object_internal_read (sobj->descriptor, | |
582 | sobj->offset + eor->shoff + shdr_size, | |
583 | shdrs, | |
584 | shdr_size * (shnum - 1), | |
585 | &errmsg, err)) | |
586 | { | |
587 | XDELETEVEC (shdrs); | |
588 | return errmsg; | |
589 | } | |
590 | ||
591 | /* Read the section names. */ | |
592 | ||
593 | shstrhdr = shdrs + (eor->shstrndx - 1) * shdr_size; | |
594 | name_size = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
595 | shstrhdr, sh_size, Elf_Addr); | |
596 | shstroff = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
597 | shstrhdr, sh_offset, Elf_Addr); | |
598 | names = XNEWVEC (unsigned char, name_size); | |
599 | if (!simple_object_internal_read (sobj->descriptor, | |
600 | sobj->offset + shstroff, | |
601 | names, name_size, &errmsg, err)) | |
602 | { | |
603 | XDELETEVEC (names); | |
604 | XDELETEVEC (shdrs); | |
605 | return errmsg; | |
606 | } | |
607 | ||
608 | for (i = 1; i < shnum; ++i) | |
609 | { | |
610 | unsigned char *shdr; | |
611 | unsigned int sh_name; | |
612 | const char *name; | |
613 | off_t offset; | |
614 | off_t length; | |
615 | ||
616 | shdr = shdrs + (i - 1) * shdr_size; | |
617 | sh_name = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
618 | shdr, sh_name, Elf_Word); | |
619 | if (sh_name >= name_size) | |
620 | { | |
621 | *err = 0; | |
622 | XDELETEVEC (names); | |
623 | XDELETEVEC (shdrs); | |
624 | return "ELF section name out of range"; | |
625 | } | |
626 | ||
627 | name = (const char *) names + sh_name; | |
628 | offset = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
629 | shdr, sh_offset, Elf_Addr); | |
630 | length = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
631 | shdr, sh_size, Elf_Addr); | |
632 | ||
633 | if (!(*pfn) (data, name, offset, length)) | |
634 | break; | |
635 | } | |
636 | ||
637 | XDELETEVEC (names); | |
638 | XDELETEVEC (shdrs); | |
639 | ||
640 | return NULL; | |
641 | } | |
642 | ||
643 | /* Fetch the attributes for an simple_object_read. */ | |
644 | ||
645 | static void * | |
646 | simple_object_elf_fetch_attributes (simple_object_read *sobj, | |
647 | const char **errmsg ATTRIBUTE_UNUSED, | |
648 | int *err ATTRIBUTE_UNUSED) | |
649 | { | |
650 | struct simple_object_elf_read *eor = | |
651 | (struct simple_object_elf_read *) sobj->data; | |
652 | struct simple_object_elf_attributes *ret; | |
653 | ||
654 | ret = XNEW (struct simple_object_elf_attributes); | |
655 | ret->type_functions = eor->type_functions; | |
656 | ret->ei_data = eor->ei_data; | |
657 | ret->ei_class = eor->ei_class; | |
658 | ret->ei_osabi = eor->ei_osabi; | |
659 | ret->machine = eor->machine; | |
660 | ret->flags = eor->flags; | |
661 | return ret; | |
662 | } | |
663 | ||
664 | /* Release the privata data for an simple_object_read. */ | |
665 | ||
666 | static void | |
667 | simple_object_elf_release_read (void *data) | |
668 | { | |
669 | XDELETE (data); | |
670 | } | |
671 | ||
672 | /* Compare two attributes structures. */ | |
673 | ||
674 | static const char * | |
f9e6589d | 675 | simple_object_elf_attributes_merge (void *todata, void *fromdata, int *err) |
ffa54e5c | 676 | { |
f9e6589d DD |
677 | struct simple_object_elf_attributes *to = |
678 | (struct simple_object_elf_attributes *) todata; | |
679 | struct simple_object_elf_attributes *from = | |
680 | (struct simple_object_elf_attributes *) fromdata; | |
681 | ||
682 | if (to->ei_data != from->ei_data || to->ei_class != from->ei_class) | |
ffa54e5c DD |
683 | { |
684 | *err = 0; | |
685 | return "ELF object format mismatch"; | |
686 | } | |
f9e6589d DD |
687 | |
688 | if (to->machine != from->machine) | |
689 | { | |
690 | int ok; | |
691 | ||
692 | /* EM_SPARC and EM_SPARC32PLUS are compatible and force an | |
693 | output of EM_SPARC32PLUS. */ | |
694 | ok = 0; | |
695 | switch (to->machine) | |
696 | { | |
697 | case EM_SPARC: | |
698 | if (from->machine == EM_SPARC32PLUS) | |
699 | { | |
700 | to->machine = from->machine; | |
701 | ok = 1; | |
702 | } | |
703 | break; | |
704 | ||
705 | case EM_SPARC32PLUS: | |
706 | if (from->machine == EM_SPARC) | |
707 | ok = 1; | |
708 | break; | |
709 | ||
710 | default: | |
711 | break; | |
712 | } | |
713 | ||
714 | if (!ok) | |
715 | { | |
716 | *err = 0; | |
717 | return "ELF machine number mismatch"; | |
718 | } | |
719 | } | |
720 | ||
ffa54e5c DD |
721 | return NULL; |
722 | } | |
723 | ||
724 | /* Release the private data for an attributes structure. */ | |
725 | ||
726 | static void | |
727 | simple_object_elf_release_attributes (void *data) | |
728 | { | |
729 | XDELETE (data); | |
730 | } | |
731 | ||
732 | /* Prepare to write out a file. */ | |
733 | ||
734 | static void * | |
735 | simple_object_elf_start_write (void *attributes_data, | |
736 | const char **errmsg ATTRIBUTE_UNUSED, | |
737 | int *err ATTRIBUTE_UNUSED) | |
738 | { | |
739 | struct simple_object_elf_attributes *attrs = | |
740 | (struct simple_object_elf_attributes *) attributes_data; | |
f8ad2513 | 741 | struct simple_object_elf_write *ret; |
ffa54e5c DD |
742 | |
743 | /* We're just going to record the attributes, but we need to make a | |
744 | copy because the user may delete them. */ | |
f8ad2513 NC |
745 | ret = XNEW (struct simple_object_elf_write); |
746 | ret->attrs = *attrs; | |
747 | ret->shdrs = NULL; | |
ffa54e5c DD |
748 | return ret; |
749 | } | |
750 | ||
751 | /* Write out an ELF ehdr. */ | |
752 | ||
753 | static int | |
754 | simple_object_elf_write_ehdr (simple_object_write *sobj, int descriptor, | |
755 | const char **errmsg, int *err) | |
756 | { | |
757 | struct simple_object_elf_attributes *attrs = | |
758 | (struct simple_object_elf_attributes *) sobj->data; | |
759 | const struct elf_type_functions* fns; | |
760 | unsigned char cl; | |
761 | size_t ehdr_size; | |
762 | unsigned char buf[sizeof (Elf64_External_Ehdr)]; | |
763 | simple_object_write_section *section; | |
764 | unsigned int shnum; | |
b55f9678 | 765 | unsigned int shstrndx; |
ffa54e5c DD |
766 | |
767 | fns = attrs->type_functions; | |
768 | cl = attrs->ei_class; | |
769 | ||
770 | shnum = 0; | |
771 | for (section = sobj->sections; section != NULL; section = section->next) | |
772 | ++shnum; | |
773 | if (shnum > 0) | |
774 | { | |
775 | /* Add a section header for the dummy section and one for | |
776 | .shstrtab. */ | |
777 | shnum += 2; | |
778 | } | |
779 | ||
780 | ehdr_size = (cl == ELFCLASS32 | |
781 | ? sizeof (Elf32_External_Ehdr) | |
782 | : sizeof (Elf64_External_Ehdr)); | |
783 | memset (buf, 0, sizeof (Elf64_External_Ehdr)); | |
784 | ||
785 | buf[EI_MAG0] = ELFMAG0; | |
786 | buf[EI_MAG1] = ELFMAG1; | |
787 | buf[EI_MAG2] = ELFMAG2; | |
788 | buf[EI_MAG3] = ELFMAG3; | |
789 | buf[EI_CLASS] = cl; | |
790 | buf[EI_DATA] = attrs->ei_data; | |
791 | buf[EI_VERSION] = EV_CURRENT; | |
792 | buf[EI_OSABI] = attrs->ei_osabi; | |
793 | ||
794 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_type, Elf_Half, ET_REL); | |
795 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_machine, Elf_Half, attrs->machine); | |
796 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_version, Elf_Word, EV_CURRENT); | |
797 | /* e_entry left as zero. */ | |
798 | /* e_phoff left as zero. */ | |
799 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_shoff, Elf_Addr, ehdr_size); | |
800 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_flags, Elf_Word, attrs->flags); | |
801 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_ehsize, Elf_Half, ehdr_size); | |
802 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_phentsize, Elf_Half, | |
803 | (cl == ELFCLASS32 | |
804 | ? sizeof (Elf32_External_Phdr) | |
805 | : sizeof (Elf64_External_Phdr))); | |
806 | /* e_phnum left as zero. */ | |
807 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_shentsize, Elf_Half, | |
808 | (cl == ELFCLASS32 | |
809 | ? sizeof (Elf32_External_Shdr) | |
810 | : sizeof (Elf64_External_Shdr))); | |
b55f9678 IB |
811 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_shnum, Elf_Half, |
812 | shnum >= SHN_LORESERVE ? 0 : shnum); | |
813 | if (shnum == 0) | |
814 | shstrndx = 0; | |
815 | else | |
816 | { | |
817 | shstrndx = shnum - 1; | |
818 | if (shstrndx >= SHN_LORESERVE) | |
819 | shstrndx = SHN_XINDEX; | |
820 | } | |
821 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_shstrndx, Elf_Half, shstrndx); | |
ffa54e5c DD |
822 | |
823 | return simple_object_internal_write (descriptor, 0, buf, ehdr_size, | |
824 | errmsg, err); | |
825 | } | |
826 | ||
827 | /* Write out an ELF shdr. */ | |
828 | ||
829 | static int | |
830 | simple_object_elf_write_shdr (simple_object_write *sobj, int descriptor, | |
831 | off_t offset, unsigned int sh_name, | |
832 | unsigned int sh_type, unsigned int sh_flags, | |
f8ad2513 | 833 | off_t sh_addr, |
ffa54e5c | 834 | unsigned int sh_offset, unsigned int sh_size, |
f8ad2513 NC |
835 | unsigned int sh_link, unsigned int sh_info, |
836 | size_t sh_addralign, | |
837 | size_t sh_entsize, | |
b55f9678 | 838 | const char **errmsg, int *err) |
ffa54e5c DD |
839 | { |
840 | struct simple_object_elf_attributes *attrs = | |
841 | (struct simple_object_elf_attributes *) sobj->data; | |
842 | const struct elf_type_functions* fns; | |
843 | unsigned char cl; | |
844 | size_t shdr_size; | |
845 | unsigned char buf[sizeof (Elf64_External_Shdr)]; | |
846 | ||
847 | fns = attrs->type_functions; | |
848 | cl = attrs->ei_class; | |
849 | ||
850 | shdr_size = (cl == ELFCLASS32 | |
851 | ? sizeof (Elf32_External_Shdr) | |
852 | : sizeof (Elf64_External_Shdr)); | |
853 | memset (buf, 0, sizeof (Elf64_External_Shdr)); | |
854 | ||
855 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_name, Elf_Word, sh_name); | |
856 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_type, Elf_Word, sh_type); | |
857 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_flags, Elf_Addr, sh_flags); | |
f8ad2513 | 858 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_addr, Elf_Addr, sh_addr); |
ffa54e5c DD |
859 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_offset, Elf_Addr, sh_offset); |
860 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_size, Elf_Addr, sh_size); | |
b55f9678 | 861 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_link, Elf_Word, sh_link); |
f8ad2513 | 862 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_info, Elf_Word, sh_info); |
ffa54e5c | 863 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_addralign, Elf_Addr, sh_addralign); |
f8ad2513 | 864 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_entsize, Elf_Addr, sh_entsize); |
ffa54e5c DD |
865 | |
866 | return simple_object_internal_write (descriptor, offset, buf, shdr_size, | |
867 | errmsg, err); | |
868 | } | |
869 | ||
870 | /* Write out a complete ELF file. | |
871 | Ehdr | |
872 | initial dummy Shdr | |
873 | user-created Shdrs | |
874 | .shstrtab Shdr | |
875 | user-created section data | |
876 | .shstrtab data */ | |
877 | ||
878 | static const char * | |
879 | simple_object_elf_write_to_file (simple_object_write *sobj, int descriptor, | |
880 | int *err) | |
881 | { | |
f8ad2513 NC |
882 | struct simple_object_elf_write *eow = |
883 | (struct simple_object_elf_write *) sobj->data; | |
884 | struct simple_object_elf_attributes *attrs = &eow->attrs; | |
ffa54e5c DD |
885 | unsigned char cl; |
886 | size_t ehdr_size; | |
887 | size_t shdr_size; | |
888 | const char *errmsg; | |
889 | simple_object_write_section *section; | |
890 | unsigned int shnum; | |
891 | size_t shdr_offset; | |
892 | size_t sh_offset; | |
b55f9678 IB |
893 | unsigned int first_sh_size; |
894 | unsigned int first_sh_link; | |
ffa54e5c DD |
895 | size_t sh_name; |
896 | unsigned char zero; | |
f8ad2513 | 897 | unsigned secnum; |
ffa54e5c DD |
898 | |
899 | if (!simple_object_elf_write_ehdr (sobj, descriptor, &errmsg, err)) | |
900 | return errmsg; | |
901 | ||
902 | cl = attrs->ei_class; | |
903 | if (cl == ELFCLASS32) | |
904 | { | |
905 | ehdr_size = sizeof (Elf32_External_Ehdr); | |
906 | shdr_size = sizeof (Elf32_External_Shdr); | |
907 | } | |
908 | else | |
909 | { | |
910 | ehdr_size = sizeof (Elf64_External_Ehdr); | |
911 | shdr_size = sizeof (Elf64_External_Shdr); | |
912 | } | |
913 | ||
914 | shnum = 0; | |
915 | for (section = sobj->sections; section != NULL; section = section->next) | |
916 | ++shnum; | |
917 | if (shnum == 0) | |
918 | return NULL; | |
919 | ||
920 | /* Add initial dummy Shdr and .shstrtab. */ | |
921 | shnum += 2; | |
922 | ||
923 | shdr_offset = ehdr_size; | |
924 | sh_offset = shdr_offset + shnum * shdr_size; | |
925 | ||
b55f9678 IB |
926 | if (shnum < SHN_LORESERVE) |
927 | first_sh_size = 0; | |
928 | else | |
929 | first_sh_size = shnum; | |
930 | if (shnum - 1 < SHN_LORESERVE) | |
931 | first_sh_link = 0; | |
932 | else | |
933 | first_sh_link = shnum - 1; | |
ffa54e5c | 934 | if (!simple_object_elf_write_shdr (sobj, descriptor, shdr_offset, |
f8ad2513 NC |
935 | 0, 0, 0, 0, 0, first_sh_size, first_sh_link, |
936 | 0, 0, 0, &errmsg, err)) | |
ffa54e5c DD |
937 | return errmsg; |
938 | ||
939 | shdr_offset += shdr_size; | |
940 | ||
941 | sh_name = 1; | |
f8ad2513 | 942 | secnum = 0; |
ffa54e5c DD |
943 | for (section = sobj->sections; section != NULL; section = section->next) |
944 | { | |
945 | size_t mask; | |
946 | size_t new_sh_offset; | |
947 | size_t sh_size; | |
948 | struct simple_object_write_section_buffer *buffer; | |
f8ad2513 NC |
949 | unsigned int sh_type = SHT_PROGBITS; |
950 | unsigned int sh_flags = 0; | |
951 | off_t sh_addr = 0; | |
952 | unsigned int sh_link = 0; | |
953 | unsigned int sh_info = 0; | |
954 | size_t sh_addralign = 1U << section->align; | |
955 | size_t sh_entsize = 0; | |
956 | if (eow->shdrs) | |
957 | { | |
958 | sh_type = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, | |
959 | eow->shdrs + secnum * shdr_size, | |
960 | sh_type, Elf_Word); | |
961 | sh_flags = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, | |
962 | eow->shdrs + secnum * shdr_size, | |
963 | sh_flags, Elf_Addr); | |
964 | sh_addr = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, | |
965 | eow->shdrs + secnum * shdr_size, | |
966 | sh_addr, Elf_Addr); | |
967 | sh_link = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, | |
968 | eow->shdrs + secnum * shdr_size, | |
969 | sh_link, Elf_Word); | |
970 | sh_info = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, | |
971 | eow->shdrs + secnum * shdr_size, | |
972 | sh_info, Elf_Word); | |
973 | sh_addralign = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, | |
974 | eow->shdrs + secnum * shdr_size, | |
975 | sh_addralign, Elf_Addr); | |
976 | sh_entsize = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, | |
977 | eow->shdrs + secnum * shdr_size, | |
978 | sh_entsize, Elf_Addr); | |
979 | secnum++; | |
980 | } | |
ffa54e5c | 981 | |
f8ad2513 | 982 | mask = sh_addralign - 1; |
ffa54e5c DD |
983 | new_sh_offset = sh_offset + mask; |
984 | new_sh_offset &= ~ mask; | |
985 | while (new_sh_offset > sh_offset) | |
986 | { | |
987 | unsigned char zeroes[16]; | |
988 | size_t write; | |
989 | ||
990 | memset (zeroes, 0, sizeof zeroes); | |
991 | write = new_sh_offset - sh_offset; | |
992 | if (write > sizeof zeroes) | |
993 | write = sizeof zeroes; | |
994 | if (!simple_object_internal_write (descriptor, sh_offset, zeroes, | |
995 | write, &errmsg, err)) | |
996 | return errmsg; | |
997 | sh_offset += write; | |
998 | } | |
999 | ||
1000 | sh_size = 0; | |
1001 | for (buffer = section->buffers; buffer != NULL; buffer = buffer->next) | |
1002 | { | |
1003 | if (!simple_object_internal_write (descriptor, sh_offset + sh_size, | |
1004 | ((const unsigned char *) | |
1005 | buffer->buffer), | |
1006 | buffer->size, &errmsg, err)) | |
1007 | return errmsg; | |
1008 | sh_size += buffer->size; | |
1009 | } | |
1010 | ||
1011 | if (!simple_object_elf_write_shdr (sobj, descriptor, shdr_offset, | |
f8ad2513 NC |
1012 | sh_name, sh_type, sh_flags, |
1013 | sh_addr, sh_offset, | |
1014 | sh_size, sh_link, sh_info, | |
1015 | sh_addralign, sh_entsize, | |
ffa54e5c DD |
1016 | &errmsg, err)) |
1017 | return errmsg; | |
1018 | ||
1019 | shdr_offset += shdr_size; | |
1020 | sh_name += strlen (section->name) + 1; | |
1021 | sh_offset += sh_size; | |
1022 | } | |
1023 | ||
1024 | if (!simple_object_elf_write_shdr (sobj, descriptor, shdr_offset, | |
f8ad2513 NC |
1025 | sh_name, SHT_STRTAB, 0, 0, sh_offset, |
1026 | sh_name + strlen (".shstrtab") + 1, 0, 0, | |
1027 | 1, 0, &errmsg, err)) | |
ffa54e5c DD |
1028 | return errmsg; |
1029 | ||
1030 | /* .shstrtab has a leading zero byte. */ | |
1031 | zero = 0; | |
1032 | if (!simple_object_internal_write (descriptor, sh_offset, &zero, 1, | |
1033 | &errmsg, err)) | |
1034 | return errmsg; | |
1035 | ++sh_offset; | |
1036 | ||
1037 | for (section = sobj->sections; section != NULL; section = section->next) | |
1038 | { | |
1039 | size_t len; | |
1040 | ||
1041 | len = strlen (section->name) + 1; | |
1042 | if (!simple_object_internal_write (descriptor, sh_offset, | |
1043 | (const unsigned char *) section->name, | |
1044 | len, &errmsg, err)) | |
1045 | return errmsg; | |
1046 | sh_offset += len; | |
1047 | } | |
1048 | ||
1049 | if (!simple_object_internal_write (descriptor, sh_offset, | |
1050 | (const unsigned char *) ".shstrtab", | |
1051 | strlen (".shstrtab") + 1, &errmsg, err)) | |
1052 | return errmsg; | |
1053 | ||
1054 | return NULL; | |
1055 | } | |
1056 | ||
1057 | /* Release the private data for an simple_object_write structure. */ | |
1058 | ||
1059 | static void | |
1060 | simple_object_elf_release_write (void *data) | |
1061 | { | |
f8ad2513 NC |
1062 | struct simple_object_elf_write *eow = (struct simple_object_elf_write *) data; |
1063 | if (eow->shdrs) | |
1064 | XDELETE (eow->shdrs); | |
ffa54e5c DD |
1065 | XDELETE (data); |
1066 | } | |
1067 | ||
f8ad2513 NC |
1068 | /* Copy all sections in an ELF file. */ |
1069 | ||
1070 | static const char * | |
1071 | simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj, | |
1072 | simple_object_write *dobj, | |
1073 | int (*pfn) (const char **), | |
1074 | int *err) | |
1075 | { | |
1076 | struct simple_object_elf_read *eor = | |
1077 | (struct simple_object_elf_read *) sobj->data; | |
1078 | const struct elf_type_functions *type_functions = eor->type_functions; | |
1079 | struct simple_object_elf_write *eow = | |
1080 | (struct simple_object_elf_write *) dobj->data; | |
1081 | unsigned char ei_class = eor->ei_class; | |
1082 | size_t shdr_size; | |
1083 | unsigned int shnum; | |
1084 | unsigned char *shdrs; | |
1085 | const char *errmsg; | |
1086 | unsigned char *shstrhdr; | |
1087 | size_t name_size; | |
1088 | off_t shstroff; | |
1089 | unsigned char *names; | |
1090 | unsigned int i; | |
2a8ae714 | 1091 | int changed; |
f8ad2513 NC |
1092 | int *pfnret; |
1093 | const char **pfnname; | |
2a8ae714 | 1094 | unsigned first_shndx = 0; |
f8ad2513 NC |
1095 | |
1096 | shdr_size = (ei_class == ELFCLASS32 | |
1097 | ? sizeof (Elf32_External_Shdr) | |
1098 | : sizeof (Elf64_External_Shdr)); | |
1099 | ||
1100 | /* Read the section headers. We skip section 0, which is not a | |
1101 | useful section. */ | |
1102 | ||
1103 | shnum = eor->shnum; | |
1104 | shdrs = XNEWVEC (unsigned char, shdr_size * (shnum - 1)); | |
1105 | ||
1106 | if (!simple_object_internal_read (sobj->descriptor, | |
1107 | sobj->offset + eor->shoff + shdr_size, | |
1108 | shdrs, | |
1109 | shdr_size * (shnum - 1), | |
1110 | &errmsg, err)) | |
1111 | { | |
1112 | XDELETEVEC (shdrs); | |
1113 | return errmsg; | |
1114 | } | |
1115 | ||
1116 | /* Read the section names. */ | |
1117 | ||
1118 | shstrhdr = shdrs + (eor->shstrndx - 1) * shdr_size; | |
1119 | name_size = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1120 | shstrhdr, sh_size, Elf_Addr); | |
1121 | shstroff = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1122 | shstrhdr, sh_offset, Elf_Addr); | |
1123 | names = XNEWVEC (unsigned char, name_size); | |
1124 | if (!simple_object_internal_read (sobj->descriptor, | |
1125 | sobj->offset + shstroff, | |
1126 | names, name_size, &errmsg, err)) | |
1127 | { | |
1128 | XDELETEVEC (names); | |
1129 | XDELETEVEC (shdrs); | |
1130 | return errmsg; | |
1131 | } | |
1132 | ||
1133 | eow->shdrs = XNEWVEC (unsigned char, shdr_size * (shnum - 1)); | |
1134 | pfnret = XNEWVEC (int, shnum); | |
1135 | pfnname = XNEWVEC (const char *, shnum); | |
1136 | ||
1137 | /* First perform the callbacks to know which sections to preserve and | |
1138 | what name to use for those. */ | |
1139 | for (i = 1; i < shnum; ++i) | |
1140 | { | |
1141 | unsigned char *shdr; | |
1142 | unsigned int sh_name; | |
1143 | const char *name; | |
1144 | int ret; | |
1145 | ||
1146 | shdr = shdrs + (i - 1) * shdr_size; | |
1147 | sh_name = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1148 | shdr, sh_name, Elf_Word); | |
1149 | if (sh_name >= name_size) | |
1150 | { | |
1151 | *err = 0; | |
1152 | XDELETEVEC (names); | |
1153 | XDELETEVEC (shdrs); | |
1154 | return "ELF section name out of range"; | |
1155 | } | |
1156 | ||
1157 | name = (const char *) names + sh_name; | |
1158 | ||
1159 | ret = (*pfn) (&name); | |
1160 | pfnret[i - 1] = ret == 1 ? 0 : -1; | |
1161 | pfnname[i - 1] = name; | |
2a8ae714 NC |
1162 | if (first_shndx == 0 |
1163 | && pfnret[i - 1] == 0) | |
1164 | first_shndx = i; | |
f8ad2513 NC |
1165 | } |
1166 | ||
1167 | /* Mark sections as preserved that are required by to be preserved | |
1168 | sections. */ | |
26a67918 | 1169 | do |
f8ad2513 | 1170 | { |
26a67918 PA |
1171 | changed = 0; |
1172 | for (i = 1; i < shnum; ++i) | |
f8ad2513 | 1173 | { |
26a67918 PA |
1174 | unsigned char *shdr; |
1175 | unsigned int sh_type, sh_info, sh_link; | |
1176 | off_t offset; | |
1177 | off_t length; | |
1178 | ||
1179 | shdr = shdrs + (i - 1) * shdr_size; | |
1180 | sh_type = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1181 | shdr, sh_type, Elf_Word); | |
1182 | sh_info = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1183 | shdr, sh_info, Elf_Word); | |
1184 | sh_link = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1185 | shdr, sh_link, Elf_Word); | |
1186 | if (sh_type == SHT_GROUP) | |
f8ad2513 | 1187 | { |
26a67918 PA |
1188 | /* Mark groups containing copied sections. */ |
1189 | unsigned entsize = ELF_FETCH_FIELD (type_functions, ei_class, | |
1190 | Shdr, shdr, sh_entsize, | |
1191 | Elf_Addr); | |
1192 | unsigned char *ent, *buf; | |
1193 | int keep = 0; | |
1194 | offset = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1195 | shdr, sh_offset, Elf_Addr); | |
1196 | length = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1197 | shdr, sh_size, Elf_Addr); | |
1198 | buf = XNEWVEC (unsigned char, length); | |
1199 | if (!simple_object_internal_read (sobj->descriptor, | |
1200 | sobj->offset + offset, buf, | |
1201 | (size_t) length, &errmsg, err)) | |
1202 | { | |
1203 | XDELETEVEC (buf); | |
1204 | XDELETEVEC (names); | |
1205 | XDELETEVEC (shdrs); | |
1206 | return errmsg; | |
1207 | } | |
1208 | for (ent = buf + entsize; ent < buf + length; ent += entsize) | |
1209 | { | |
1210 | unsigned sec = type_functions->fetch_Elf_Word (ent); | |
1211 | if (pfnret[sec - 1] == 0) | |
1212 | keep = 1; | |
1213 | } | |
1214 | if (keep) | |
1215 | { | |
1216 | changed |= (pfnret[sh_link - 1] == -1 | |
1217 | || pfnret[i - 1] == -1); | |
1218 | pfnret[sh_link - 1] = 0; | |
1219 | pfnret[i - 1] = 0; | |
1220 | } | |
f8ad2513 | 1221 | } |
26a67918 PA |
1222 | if (sh_type == SHT_RELA |
1223 | || sh_type == SHT_REL) | |
f8ad2513 | 1224 | { |
26a67918 PA |
1225 | /* Mark relocation sections and symtab of copied sections. */ |
1226 | if (pfnret[sh_info - 1] == 0) | |
1227 | { | |
1228 | changed |= (pfnret[sh_link - 1] == -1 | |
1229 | || pfnret[i - 1] == -1); | |
1230 | pfnret[sh_link - 1] = 0; | |
1231 | pfnret[i - 1] = 0; | |
1232 | } | |
f8ad2513 | 1233 | } |
26a67918 | 1234 | if (sh_type == SHT_SYMTAB) |
f8ad2513 | 1235 | { |
26a67918 PA |
1236 | /* Mark strings sections of copied symtabs. */ |
1237 | if (pfnret[i - 1] == 0) | |
1238 | { | |
1239 | changed |= pfnret[sh_link - 1] == -1; | |
1240 | pfnret[sh_link - 1] = 0; | |
1241 | } | |
f8ad2513 NC |
1242 | } |
1243 | } | |
f8ad2513 | 1244 | } |
26a67918 | 1245 | while (changed); |
f8ad2513 NC |
1246 | |
1247 | /* Then perform the actual copying. */ | |
1248 | for (i = 1; i < shnum; ++i) | |
1249 | { | |
1250 | unsigned char *shdr; | |
1251 | unsigned int sh_name, sh_type; | |
1252 | const char *name; | |
1253 | off_t offset; | |
1254 | off_t length; | |
1255 | int ret; | |
f8ad2513 NC |
1256 | simple_object_write_section *dest; |
1257 | off_t flags; | |
1258 | unsigned char *buf; | |
1259 | ||
1260 | shdr = shdrs + (i - 1) * shdr_size; | |
1261 | sh_name = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1262 | shdr, sh_name, Elf_Word); | |
1263 | if (sh_name >= name_size) | |
1264 | { | |
1265 | *err = 0; | |
1266 | XDELETEVEC (names); | |
1267 | XDELETEVEC (shdrs); | |
1268 | return "ELF section name out of range"; | |
1269 | } | |
1270 | ||
1271 | name = (const char *) names + sh_name; | |
1272 | offset = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1273 | shdr, sh_offset, Elf_Addr); | |
1274 | length = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1275 | shdr, sh_size, Elf_Addr); | |
1276 | sh_type = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1277 | shdr, sh_type, Elf_Word); | |
1278 | ||
1279 | ret = pfnret[i - 1]; | |
1280 | name = ret == 0 ? pfnname[i - 1] : ""; | |
1281 | ||
1282 | dest = simple_object_write_create_section (dobj, name, 0, &errmsg, err); | |
1283 | if (dest == NULL) | |
1284 | { | |
1285 | XDELETEVEC (names); | |
1286 | XDELETEVEC (shdrs); | |
1287 | return errmsg; | |
1288 | } | |
1289 | ||
1290 | /* Record the SHDR of the source. */ | |
1291 | memcpy (eow->shdrs + (i - 1) * shdr_size, shdr, shdr_size); | |
1292 | shdr = eow->shdrs + (i - 1) * shdr_size; | |
1293 | ||
1294 | /* Copy the data. | |
1295 | ??? This is quite wasteful and ideally would be delayed until | |
1296 | write_to_file (). Thus it questions the interfacing | |
1297 | which eventually should contain destination creation plus | |
1298 | writing. */ | |
1299 | /* Keep empty sections for sections we should discard. This avoids | |
1300 | the need to rewrite section indices in symtab and relocation | |
1301 | sections. */ | |
1302 | if (ret == 0) | |
1303 | { | |
1304 | buf = XNEWVEC (unsigned char, length); | |
1305 | if (!simple_object_internal_read (sobj->descriptor, | |
1306 | sobj->offset + offset, buf, | |
1307 | (size_t) length, &errmsg, err)) | |
1308 | { | |
1309 | XDELETEVEC (buf); | |
1310 | XDELETEVEC (names); | |
1311 | XDELETEVEC (shdrs); | |
1312 | return errmsg; | |
1313 | } | |
1314 | ||
1315 | /* If we are processing .symtab purge __gnu_lto_v1 and | |
1316 | __gnu_lto_slim symbols from it. */ | |
1317 | if (sh_type == SHT_SYMTAB) | |
1318 | { | |
1319 | unsigned entsize = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1320 | shdr, sh_entsize, Elf_Addr); | |
1321 | unsigned strtab = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1322 | shdr, sh_link, Elf_Word); | |
1323 | unsigned char *strshdr = shdrs + (strtab - 1) * shdr_size; | |
1324 | off_t stroff = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1325 | strshdr, sh_offset, Elf_Addr); | |
1326 | size_t strsz = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1327 | strshdr, sh_size, Elf_Addr); | |
1328 | char *strings = XNEWVEC (char, strsz); | |
1329 | unsigned char *ent; | |
1330 | simple_object_internal_read (sobj->descriptor, | |
1331 | sobj->offset + stroff, | |
1332 | (unsigned char *)strings, | |
1333 | strsz, &errmsg, err); | |
2a8ae714 NC |
1334 | /* Find gnu_lto_ in strings. */ |
1335 | char *gnu_lto = strings; | |
1336 | while ((gnu_lto = memchr (gnu_lto, 'g', | |
1337 | strings + strsz - gnu_lto))) | |
1338 | if (strncmp (gnu_lto, "gnu_lto_v1", | |
1339 | strings + strsz - gnu_lto) == 0) | |
1340 | break; | |
1341 | else | |
1342 | gnu_lto++; | |
f8ad2513 NC |
1343 | for (ent = buf; ent < buf + length; ent += entsize) |
1344 | { | |
1345 | unsigned st_shndx = ELF_FETCH_FIELD (type_functions, ei_class, | |
1346 | Sym, ent, | |
1347 | st_shndx, Elf_Half); | |
1348 | unsigned char *st_info; | |
1349 | unsigned char *st_other; | |
1350 | int discard = 0; | |
1351 | if (ei_class == ELFCLASS32) | |
1352 | { | |
1353 | st_info = &((Elf32_External_Sym *)ent)->st_info; | |
1354 | st_other = &((Elf32_External_Sym *)ent)->st_other; | |
1355 | } | |
1356 | else | |
1357 | { | |
1358 | st_info = &((Elf64_External_Sym *)ent)->st_info; | |
1359 | st_other = &((Elf64_External_Sym *)ent)->st_other; | |
1360 | } | |
1361 | /* Eliminate all COMMONs - this includes __gnu_lto_v1 | |
1362 | and __gnu_lto_slim which otherwise cause endless | |
1363 | LTO plugin invocation. */ | |
1364 | if (st_shndx == SHN_COMMON) | |
f8ad2513 NC |
1365 | discard = 1; |
1366 | /* We also need to remove symbols refering to sections | |
1367 | we'll eventually remove as with fat LTO objects | |
1368 | we otherwise get duplicate symbols at final link | |
1369 | (with GNU ld, gold is fine and ignores symbols in | |
1370 | sections marked as EXCLUDE). ld/20513 */ | |
1371 | else if (st_shndx != SHN_UNDEF | |
1372 | && st_shndx < shnum | |
1373 | && pfnret[st_shndx - 1] == -1) | |
1374 | discard = 1; | |
1375 | ||
1376 | if (discard) | |
1377 | { | |
1378 | /* Make discarded symbols undefined and unnamed | |
1379 | in case it is local. */ | |
2a8ae714 NC |
1380 | int bind = ELF_ST_BIND (*st_info); |
1381 | int other = STV_DEFAULT; | |
1382 | if (bind == STB_LOCAL) | |
1383 | { | |
1384 | /* Make discarded local symbols unnamed and | |
1385 | defined in the first prevailing section. */ | |
1386 | ELF_SET_FIELD (type_functions, ei_class, Sym, | |
1387 | ent, st_name, Elf_Word, 0); | |
1388 | ELF_SET_FIELD (type_functions, ei_class, Sym, | |
1389 | ent, st_shndx, Elf_Half, first_shndx); | |
1390 | } | |
1391 | else | |
1392 | { | |
1393 | /* Make discarded global symbols hidden weak | |
1394 | undefined and sharing the gnu_lto_ name. */ | |
1395 | bind = STB_WEAK; | |
1396 | other = STV_HIDDEN; | |
1397 | if (gnu_lto) | |
1398 | ELF_SET_FIELD (type_functions, ei_class, Sym, | |
1399 | ent, st_name, Elf_Word, | |
1400 | gnu_lto - strings); | |
1401 | ELF_SET_FIELD (type_functions, ei_class, Sym, | |
1402 | ent, st_shndx, Elf_Half, SHN_UNDEF); | |
1403 | } | |
1404 | *st_other = other; | |
1405 | *st_info = ELF_ST_INFO (bind, STT_NOTYPE); | |
f8ad2513 NC |
1406 | ELF_SET_FIELD (type_functions, ei_class, Sym, |
1407 | ent, st_value, Elf_Addr, 0); | |
1408 | ELF_SET_FIELD (type_functions, ei_class, Sym, | |
1409 | ent, st_size, Elf_Word, 0); | |
f8ad2513 NC |
1410 | } |
1411 | } | |
1412 | XDELETEVEC (strings); | |
1413 | } | |
1414 | ||
1415 | errmsg = simple_object_write_add_data (dobj, dest, | |
1416 | buf, length, 1, err); | |
1417 | XDELETEVEC (buf); | |
1418 | if (errmsg) | |
1419 | { | |
1420 | XDELETEVEC (names); | |
1421 | XDELETEVEC (shdrs); | |
1422 | return errmsg; | |
1423 | } | |
1424 | } | |
1425 | else | |
1426 | { | |
1427 | /* For deleted sections mark the section header table entry as | |
1428 | unused. That allows the link editor to remove it in a partial | |
1429 | link. */ | |
1430 | ELF_SET_FIELD (type_functions, ei_class, Shdr, | |
1431 | shdr, sh_type, Elf_Word, SHT_NULL); | |
2a8ae714 NC |
1432 | ELF_SET_FIELD (type_functions, ei_class, Shdr, |
1433 | shdr, sh_info, Elf_Word, 0); | |
1434 | ELF_SET_FIELD (type_functions, ei_class, Shdr, | |
1435 | shdr, sh_link, Elf_Word, 0); | |
f8ad2513 NC |
1436 | } |
1437 | ||
1438 | flags = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1439 | shdr, sh_flags, Elf_Addr); | |
1440 | if (ret == 0) | |
2a8ae714 NC |
1441 | { |
1442 | /* The debugobj doesn't contain any code, thus no trampolines. | |
1443 | Even when the original object needs trampolines, debugobj | |
1444 | doesn't. */ | |
1445 | if (strcmp (name, ".note.GNU-stack") == 0) | |
1446 | flags &= ~SHF_EXECINSTR; | |
1447 | flags &= ~SHF_EXCLUDE; | |
1448 | } | |
f8ad2513 NC |
1449 | else if (ret == -1) |
1450 | flags = SHF_EXCLUDE; | |
1451 | ELF_SET_FIELD (type_functions, ei_class, Shdr, | |
1452 | shdr, sh_flags, Elf_Addr, flags); | |
1453 | } | |
1454 | ||
1455 | XDELETEVEC (names); | |
1456 | XDELETEVEC (shdrs); | |
1457 | XDELETEVEC (pfnret); | |
1458 | XDELETEVEC (pfnname); | |
1459 | ||
1460 | return NULL; | |
1461 | } | |
1462 | ||
1463 | ||
ffa54e5c DD |
1464 | /* The ELF functions. */ |
1465 | ||
1466 | const struct simple_object_functions simple_object_elf_functions = | |
1467 | { | |
1468 | simple_object_elf_match, | |
1469 | simple_object_elf_find_sections, | |
1470 | simple_object_elf_fetch_attributes, | |
1471 | simple_object_elf_release_read, | |
f9e6589d | 1472 | simple_object_elf_attributes_merge, |
ffa54e5c DD |
1473 | simple_object_elf_release_attributes, |
1474 | simple_object_elf_start_write, | |
1475 | simple_object_elf_write_to_file, | |
f8ad2513 NC |
1476 | simple_object_elf_release_write, |
1477 | simple_object_elf_copy_lto_debug_sections | |
ffa54e5c | 1478 | }; |