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ffa54e5c | 1 | /* simple-object-elf.c -- routines to manipulate ELF object files. |
82704155 | 2 | Copyright (C) 2010-2019 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> | |
db3410f8 EZ |
25 | /* mingw.org's MinGW doesn't have ENOTSUP. */ |
26 | #ifndef ENOTSUP | |
27 | # define ENOTSUP ENOSYS | |
28 | #endif | |
ffa54e5c DD |
29 | #include <stddef.h> |
30 | ||
31 | #ifdef HAVE_STDLIB_H | |
32 | #include <stdlib.h> | |
33 | #endif | |
34 | ||
35 | #ifdef HAVE_STDINT_H | |
36 | #include <stdint.h> | |
37 | #endif | |
38 | ||
39 | #ifdef HAVE_STRING_H | |
40 | #include <string.h> | |
41 | #endif | |
42 | ||
43 | #ifdef HAVE_INTTYPES_H | |
44 | #include <inttypes.h> | |
45 | #endif | |
46 | ||
47 | #include "simple-object-common.h" | |
48 | ||
49 | /* ELF structures and constants. */ | |
50 | ||
51 | /* 32-bit ELF file header. */ | |
52 | ||
53 | typedef struct { | |
54 | unsigned char e_ident[16]; /* ELF "magic number" */ | |
55 | unsigned char e_type[2]; /* Identifies object file type */ | |
56 | unsigned char e_machine[2]; /* Specifies required architecture */ | |
57 | unsigned char e_version[4]; /* Identifies object file version */ | |
58 | unsigned char e_entry[4]; /* Entry point virtual address */ | |
59 | unsigned char e_phoff[4]; /* Program header table file offset */ | |
60 | unsigned char e_shoff[4]; /* Section header table file offset */ | |
61 | unsigned char e_flags[4]; /* Processor-specific flags */ | |
62 | unsigned char e_ehsize[2]; /* ELF header size in bytes */ | |
63 | unsigned char e_phentsize[2]; /* Program header table entry size */ | |
64 | unsigned char e_phnum[2]; /* Program header table entry count */ | |
65 | unsigned char e_shentsize[2]; /* Section header table entry size */ | |
66 | unsigned char e_shnum[2]; /* Section header table entry count */ | |
67 | unsigned char e_shstrndx[2]; /* Section header string table index */ | |
68 | } Elf32_External_Ehdr; | |
69 | ||
70 | /* 64-bit ELF file header. */ | |
71 | ||
72 | typedef struct { | |
73 | unsigned char e_ident[16]; /* ELF "magic number" */ | |
74 | unsigned char e_type[2]; /* Identifies object file type */ | |
75 | unsigned char e_machine[2]; /* Specifies required architecture */ | |
76 | unsigned char e_version[4]; /* Identifies object file version */ | |
77 | unsigned char e_entry[8]; /* Entry point virtual address */ | |
78 | unsigned char e_phoff[8]; /* Program header table file offset */ | |
79 | unsigned char e_shoff[8]; /* Section header table file offset */ | |
80 | unsigned char e_flags[4]; /* Processor-specific flags */ | |
81 | unsigned char e_ehsize[2]; /* ELF header size in bytes */ | |
82 | unsigned char e_phentsize[2]; /* Program header table entry size */ | |
83 | unsigned char e_phnum[2]; /* Program header table entry count */ | |
84 | unsigned char e_shentsize[2]; /* Section header table entry size */ | |
85 | unsigned char e_shnum[2]; /* Section header table entry count */ | |
86 | unsigned char e_shstrndx[2]; /* Section header string table index */ | |
87 | } Elf64_External_Ehdr; | |
88 | ||
89 | /* Indexes and values in e_ident field of Ehdr. */ | |
90 | ||
91 | #define EI_MAG0 0 /* File identification byte 0 index */ | |
92 | #define ELFMAG0 0x7F /* Magic number byte 0 */ | |
93 | ||
94 | #define EI_MAG1 1 /* File identification byte 1 index */ | |
95 | #define ELFMAG1 'E' /* Magic number byte 1 */ | |
96 | ||
97 | #define EI_MAG2 2 /* File identification byte 2 index */ | |
98 | #define ELFMAG2 'L' /* Magic number byte 2 */ | |
99 | ||
100 | #define EI_MAG3 3 /* File identification byte 3 index */ | |
101 | #define ELFMAG3 'F' /* Magic number byte 3 */ | |
102 | ||
103 | #define EI_CLASS 4 /* File class */ | |
104 | #define ELFCLASSNONE 0 /* Invalid class */ | |
105 | #define ELFCLASS32 1 /* 32-bit objects */ | |
106 | #define ELFCLASS64 2 /* 64-bit objects */ | |
107 | ||
108 | #define EI_DATA 5 /* Data encoding */ | |
109 | #define ELFDATANONE 0 /* Invalid data encoding */ | |
110 | #define ELFDATA2LSB 1 /* 2's complement, little endian */ | |
111 | #define ELFDATA2MSB 2 /* 2's complement, big endian */ | |
112 | ||
113 | #define EI_VERSION 6 /* File version */ | |
114 | #define EV_CURRENT 1 /* Current version */ | |
115 | ||
116 | #define EI_OSABI 7 /* Operating System/ABI indication */ | |
117 | ||
118 | /* Values for e_type field of Ehdr. */ | |
119 | ||
120 | #define ET_REL 1 /* Relocatable file */ | |
121 | ||
f9e6589d DD |
122 | /* Values for e_machine field of Ehdr. */ |
123 | ||
124 | #define EM_SPARC 2 /* SUN SPARC */ | |
125 | #define EM_SPARC32PLUS 18 /* Sun's "v8plus" */ | |
126 | ||
ffa54e5c DD |
127 | /* Special section index values. */ |
128 | ||
f8ad2513 | 129 | #define SHN_UNDEF 0 /* Undefined section */ |
ffa54e5c | 130 | #define SHN_LORESERVE 0xFF00 /* Begin range of reserved indices */ |
f8ad2513 | 131 | #define SHN_COMMON 0xFFF2 /* Associated symbol is in common */ |
ffa54e5c | 132 | #define SHN_XINDEX 0xFFFF /* Section index is held elsewhere */ |
e9301e76 | 133 | #define SHN_HIRESERVE 0xffff /* End of reserved indices */ |
ffa54e5c | 134 | |
f8ad2513 | 135 | |
ffa54e5c DD |
136 | /* 32-bit ELF program header. */ |
137 | ||
138 | typedef struct { | |
139 | unsigned char p_type[4]; /* Identifies program segment type */ | |
140 | unsigned char p_offset[4]; /* Segment file offset */ | |
141 | unsigned char p_vaddr[4]; /* Segment virtual address */ | |
142 | unsigned char p_paddr[4]; /* Segment physical address */ | |
143 | unsigned char p_filesz[4]; /* Segment size in file */ | |
144 | unsigned char p_memsz[4]; /* Segment size in memory */ | |
145 | unsigned char p_flags[4]; /* Segment flags */ | |
146 | unsigned char p_align[4]; /* Segment alignment, file & memory */ | |
147 | } Elf32_External_Phdr; | |
148 | ||
149 | /* 64-bit ELF program header. */ | |
150 | ||
151 | typedef struct { | |
152 | unsigned char p_type[4]; /* Identifies program segment type */ | |
153 | unsigned char p_flags[4]; /* Segment flags */ | |
154 | unsigned char p_offset[8]; /* Segment file offset */ | |
155 | unsigned char p_vaddr[8]; /* Segment virtual address */ | |
156 | unsigned char p_paddr[8]; /* Segment physical address */ | |
157 | unsigned char p_filesz[8]; /* Segment size in file */ | |
158 | unsigned char p_memsz[8]; /* Segment size in memory */ | |
159 | unsigned char p_align[8]; /* Segment alignment, file & memory */ | |
160 | } Elf64_External_Phdr; | |
161 | ||
162 | /* 32-bit ELF section header */ | |
163 | ||
164 | typedef struct { | |
165 | unsigned char sh_name[4]; /* Section name, index in string tbl */ | |
166 | unsigned char sh_type[4]; /* Type of section */ | |
167 | unsigned char sh_flags[4]; /* Miscellaneous section attributes */ | |
168 | unsigned char sh_addr[4]; /* Section virtual addr at execution */ | |
169 | unsigned char sh_offset[4]; /* Section file offset */ | |
170 | unsigned char sh_size[4]; /* Size of section in bytes */ | |
171 | unsigned char sh_link[4]; /* Index of another section */ | |
172 | unsigned char sh_info[4]; /* Additional section information */ | |
173 | unsigned char sh_addralign[4]; /* Section alignment */ | |
174 | unsigned char sh_entsize[4]; /* Entry size if section holds table */ | |
175 | } Elf32_External_Shdr; | |
176 | ||
177 | /* 64-bit ELF section header. */ | |
178 | ||
179 | typedef struct { | |
180 | unsigned char sh_name[4]; /* Section name, index in string tbl */ | |
181 | unsigned char sh_type[4]; /* Type of section */ | |
182 | unsigned char sh_flags[8]; /* Miscellaneous section attributes */ | |
183 | unsigned char sh_addr[8]; /* Section virtual addr at execution */ | |
184 | unsigned char sh_offset[8]; /* Section file offset */ | |
185 | unsigned char sh_size[8]; /* Size of section in bytes */ | |
186 | unsigned char sh_link[4]; /* Index of another section */ | |
187 | unsigned char sh_info[4]; /* Additional section information */ | |
188 | unsigned char sh_addralign[8]; /* Section alignment */ | |
189 | unsigned char sh_entsize[8]; /* Entry size if section holds table */ | |
190 | } Elf64_External_Shdr; | |
191 | ||
192 | /* Values for sh_type field. */ | |
193 | ||
f8ad2513 | 194 | #define SHT_NULL 0 /* Section header table entry unused */ |
ffa54e5c | 195 | #define SHT_PROGBITS 1 /* Program data */ |
f8ad2513 | 196 | #define SHT_SYMTAB 2 /* Link editing symbol table */ |
ffa54e5c | 197 | #define SHT_STRTAB 3 /* A string table */ |
f8ad2513 NC |
198 | #define SHT_RELA 4 /* Relocation entries with addends */ |
199 | #define SHT_REL 9 /* Relocation entries, no addends */ | |
200 | #define SHT_GROUP 17 /* Section contains a section group */ | |
e9301e76 | 201 | #define SHT_SYMTAB_SHNDX 18 /* Extended section indeces */ |
f8ad2513 NC |
202 | |
203 | /* Values for sh_flags field. */ | |
204 | ||
e9301e76 | 205 | #define SHF_INFO_LINK 0x00000040 /* `sh_info' contains SHT index */ |
2a8ae714 | 206 | #define SHF_EXECINSTR 0x00000004 /* Executable section. */ |
f8ad2513 NC |
207 | #define SHF_EXCLUDE 0x80000000 /* Link editor is to exclude this |
208 | section from executable and | |
209 | shared library that it builds | |
210 | when those objects are not to be | |
211 | further relocated. */ | |
212 | /* Symbol table entry. */ | |
213 | ||
214 | typedef struct | |
215 | { | |
216 | unsigned char st_name[4]; /* Symbol name (string tbl index) */ | |
217 | unsigned char st_value[4]; /* Symbol value */ | |
218 | unsigned char st_size[4]; /* Symbol size */ | |
219 | unsigned char st_info; /* Symbol type and binding */ | |
220 | unsigned char st_other; /* Symbol visibility */ | |
221 | unsigned char st_shndx[2]; /* Section index */ | |
222 | } Elf32_External_Sym; | |
223 | ||
224 | typedef struct | |
225 | { | |
226 | unsigned char st_name[4]; /* Symbol name (string tbl index) */ | |
227 | unsigned char st_info; /* Symbol type and binding */ | |
228 | unsigned char st_other; /* Symbol visibility */ | |
229 | unsigned char st_shndx[2]; /* Section index */ | |
230 | unsigned char st_value[8]; /* Symbol value */ | |
231 | unsigned char st_size[8]; /* Symbol size */ | |
232 | } Elf64_External_Sym; | |
233 | ||
234 | #define ELF_ST_BIND(val) (((unsigned char) (val)) >> 4) | |
235 | #define ELF_ST_TYPE(val) ((val) & 0xf) | |
236 | #define ELF_ST_INFO(bind, type) (((bind) << 4) + ((type) & 0xf)) | |
237 | ||
238 | #define STT_NOTYPE 0 /* Symbol type is unspecified */ | |
239 | #define STT_OBJECT 1 /* Symbol is a data object */ | |
240 | #define STT_FUNC 2 /* Symbol is a code object */ | |
241 | #define STT_TLS 6 /* Thread local data object */ | |
242 | #define STT_GNU_IFUNC 10 /* Symbol is an indirect code object */ | |
243 | ||
244 | #define STB_LOCAL 0 /* Local symbol */ | |
245 | #define STB_GLOBAL 1 /* Global symbol */ | |
2a8ae714 | 246 | #define STB_WEAK 2 /* Weak global */ |
f8ad2513 NC |
247 | |
248 | #define STV_DEFAULT 0 /* Visibility is specified by binding type */ | |
2a8ae714 | 249 | #define STV_HIDDEN 2 /* Can only be seen inside currect component */ |
ffa54e5c DD |
250 | |
251 | /* Functions to fetch and store different ELF types, depending on the | |
252 | endianness and size. */ | |
253 | ||
254 | struct elf_type_functions | |
255 | { | |
256 | unsigned short (*fetch_Elf_Half) (const unsigned char *); | |
257 | unsigned int (*fetch_Elf_Word) (const unsigned char *); | |
258 | ulong_type (*fetch_Elf_Addr) (const unsigned char *); | |
259 | void (*set_Elf_Half) (unsigned char *, unsigned short); | |
260 | void (*set_Elf_Word) (unsigned char *, unsigned int); | |
261 | void (*set_Elf_Addr) (unsigned char *, ulong_type); | |
262 | }; | |
263 | ||
264 | static const struct elf_type_functions elf_big_32_functions = | |
265 | { | |
266 | simple_object_fetch_big_16, | |
267 | simple_object_fetch_big_32, | |
268 | simple_object_fetch_big_32_ulong, | |
269 | simple_object_set_big_16, | |
270 | simple_object_set_big_32, | |
271 | simple_object_set_big_32_ulong | |
272 | }; | |
273 | ||
274 | static const struct elf_type_functions elf_little_32_functions = | |
275 | { | |
276 | simple_object_fetch_little_16, | |
277 | simple_object_fetch_little_32, | |
278 | simple_object_fetch_little_32_ulong, | |
279 | simple_object_set_little_16, | |
280 | simple_object_set_little_32, | |
281 | simple_object_set_little_32_ulong | |
282 | }; | |
283 | ||
284 | #ifdef UNSIGNED_64BIT_TYPE | |
285 | ||
286 | static const struct elf_type_functions elf_big_64_functions = | |
287 | { | |
288 | simple_object_fetch_big_16, | |
289 | simple_object_fetch_big_32, | |
290 | simple_object_fetch_big_64, | |
291 | simple_object_set_big_16, | |
292 | simple_object_set_big_32, | |
293 | simple_object_set_big_64 | |
294 | }; | |
295 | ||
296 | static const struct elf_type_functions elf_little_64_functions = | |
297 | { | |
298 | simple_object_fetch_little_16, | |
299 | simple_object_fetch_little_32, | |
300 | simple_object_fetch_little_64, | |
301 | simple_object_set_little_16, | |
302 | simple_object_set_little_32, | |
303 | simple_object_set_little_64 | |
304 | }; | |
305 | ||
306 | #endif | |
307 | ||
308 | /* Hideous macro to fetch the value of a field from an external ELF | |
309 | struct of some sort. TYPEFUNCS is the set of type functions. | |
310 | BUFFER points to the external data. STRUCTTYPE is the appropriate | |
311 | struct type. FIELD is a field within the struct. TYPE is the type | |
312 | of the field in the struct: Elf_Half, Elf_Word, or Elf_Addr. */ | |
313 | ||
314 | #define ELF_FETCH_STRUCT_FIELD(TYPEFUNCS, STRUCTTYPE, FIELD, BUFFER, TYPE) \ | |
315 | ((TYPEFUNCS)->fetch_ ## TYPE ((BUFFER) + offsetof (STRUCTTYPE, FIELD))) | |
316 | ||
317 | /* Even more hideous macro to fetch the value of FIELD from BUFFER. | |
318 | SIZE is 32 or 64. STRUCTTYPE is the name of the struct from | |
319 | elf/external.h: Ehdr, Shdr, etc. FIELD is the name of a field in | |
320 | the struct. TYPE is the type of the field in the struct: Elf_Half, | |
321 | Elf_Word, or Elf_Addr. */ | |
322 | ||
323 | #define ELF_FETCH_SIZED_FIELD(TYPEFUNCS, SIZE, STRUCTTYPE, BUFFER, \ | |
324 | FIELD, TYPE) \ | |
325 | ELF_FETCH_STRUCT_FIELD (TYPEFUNCS, \ | |
326 | Elf ## SIZE ## _External_ ## STRUCTTYPE, \ | |
327 | FIELD, BUFFER, TYPE) | |
328 | ||
329 | /* Like ELF_FETCH_SIZED_FIELD but taking an ELFCLASS value. */ | |
330 | ||
331 | #define ELF_FETCH_FIELD(TYPEFUNCS, CLASS, STRUCTTYPE, BUFFER, \ | |
332 | FIELD, TYPE) \ | |
333 | ((CLASS) == ELFCLASS32 \ | |
334 | ? ELF_FETCH_SIZED_FIELD (TYPEFUNCS, 32, STRUCTTYPE, BUFFER, FIELD, \ | |
335 | TYPE) \ | |
336 | : ELF_FETCH_SIZED_FIELD (TYPEFUNCS, 64, STRUCTTYPE, BUFFER, FIELD, \ | |
337 | TYPE)) | |
338 | ||
339 | /* Hideous macro to set the value of a field in an external ELF | |
340 | structure to VAL. TYPEFUNCS is the set of type functions. BUFFER | |
341 | points to the external data. STRUCTTYPE is the appropriate | |
342 | structure type. FIELD is a field within the struct. TYPE is the | |
343 | type of the field in the struct: Elf_Half, Elf_Word, or | |
344 | Elf_Addr. */ | |
345 | ||
346 | #define ELF_SET_STRUCT_FIELD(TYPEFUNCS, STRUCTTYPE, FIELD, BUFFER, TYPE, VAL) \ | |
347 | (TYPEFUNCS)->set_ ## TYPE ((BUFFER) + offsetof (STRUCTTYPE, FIELD), (VAL)) | |
348 | ||
349 | /* Even more hideous macro to set the value of FIELD in BUFFER to VAL. | |
350 | SIZE is 32 or 64. STRUCTTYPE is the name of the struct from | |
351 | elf/external.h: Ehdr, Shdr, etc. FIELD is the name of a field in | |
352 | the struct. TYPE is the type of the field in the struct: Elf_Half, | |
353 | Elf_Word, or Elf_Addr. */ | |
354 | ||
355 | #define ELF_SET_SIZED_FIELD(TYPEFUNCS, SIZE, STRUCTTYPE, BUFFER, FIELD, \ | |
356 | TYPE, VAL) \ | |
357 | ELF_SET_STRUCT_FIELD (TYPEFUNCS, \ | |
358 | Elf ## SIZE ## _External_ ## STRUCTTYPE, \ | |
359 | FIELD, BUFFER, TYPE, VAL) | |
360 | ||
361 | /* Like ELF_SET_SIZED_FIELD but taking an ELFCLASS value. */ | |
362 | ||
363 | #define ELF_SET_FIELD(TYPEFUNCS, CLASS, STRUCTTYPE, BUFFER, FIELD, \ | |
364 | TYPE, VAL) \ | |
365 | ((CLASS) == ELFCLASS32 \ | |
366 | ? ELF_SET_SIZED_FIELD (TYPEFUNCS, 32, STRUCTTYPE, BUFFER, FIELD, \ | |
367 | TYPE, VAL) \ | |
368 | : ELF_SET_SIZED_FIELD (TYPEFUNCS, 64, STRUCTTYPE, BUFFER, FIELD, \ | |
369 | TYPE, VAL)) | |
370 | ||
371 | /* Private data for an simple_object_read. */ | |
372 | ||
373 | struct simple_object_elf_read | |
374 | { | |
375 | /* Type functions. */ | |
376 | const struct elf_type_functions* type_functions; | |
377 | /* Elf data. */ | |
378 | unsigned char ei_data; | |
379 | /* Elf class. */ | |
380 | unsigned char ei_class; | |
381 | /* ELF OS ABI. */ | |
382 | unsigned char ei_osabi; | |
383 | /* Elf machine number. */ | |
384 | unsigned short machine; | |
385 | /* Processor specific flags. */ | |
386 | unsigned int flags; | |
387 | /* File offset of section headers. */ | |
388 | ulong_type shoff; | |
389 | /* Number of sections. */ | |
390 | unsigned int shnum; | |
391 | /* Index of string table section header. */ | |
392 | unsigned int shstrndx; | |
393 | }; | |
394 | ||
395 | /* Private data for an simple_object_attributes. */ | |
396 | ||
397 | struct simple_object_elf_attributes | |
398 | { | |
399 | /* Type functions. */ | |
400 | const struct elf_type_functions* type_functions; | |
401 | /* Elf data. */ | |
402 | unsigned char ei_data; | |
403 | /* Elf class. */ | |
404 | unsigned char ei_class; | |
405 | /* ELF OS ABI. */ | |
406 | unsigned char ei_osabi; | |
407 | /* Elf machine number. */ | |
408 | unsigned short machine; | |
409 | /* Processor specific flags. */ | |
410 | unsigned int flags; | |
411 | }; | |
412 | ||
f8ad2513 NC |
413 | /* Private data for an simple_object_write. */ |
414 | ||
415 | struct simple_object_elf_write | |
416 | { | |
417 | struct simple_object_elf_attributes attrs; | |
418 | unsigned char *shdrs; | |
419 | }; | |
420 | ||
ffa54e5c DD |
421 | /* See if we have an ELF file. */ |
422 | ||
423 | static void * | |
424 | simple_object_elf_match (unsigned char header[SIMPLE_OBJECT_MATCH_HEADER_LEN], | |
425 | int descriptor, off_t offset, | |
426 | const char *segment_name ATTRIBUTE_UNUSED, | |
427 | const char **errmsg, int *err) | |
428 | { | |
429 | unsigned char ei_data; | |
430 | unsigned char ei_class; | |
431 | const struct elf_type_functions *type_functions; | |
432 | unsigned char ehdr[sizeof (Elf64_External_Ehdr)]; | |
433 | struct simple_object_elf_read *eor; | |
434 | ||
435 | if (header[EI_MAG0] != ELFMAG0 | |
436 | || header[EI_MAG1] != ELFMAG1 | |
437 | || header[EI_MAG2] != ELFMAG2 | |
438 | || header[EI_MAG3] != ELFMAG3 | |
439 | || header[EI_VERSION] != EV_CURRENT) | |
440 | { | |
441 | *errmsg = NULL; | |
442 | *err = 0; | |
443 | return NULL; | |
444 | } | |
445 | ||
446 | ei_data = header[EI_DATA]; | |
447 | if (ei_data != ELFDATA2LSB && ei_data != ELFDATA2MSB) | |
448 | { | |
449 | *errmsg = "unknown ELF endianness"; | |
450 | *err = 0; | |
451 | return NULL; | |
452 | } | |
453 | ||
454 | ei_class = header[EI_CLASS]; | |
455 | switch (ei_class) | |
456 | { | |
457 | case ELFCLASS32: | |
458 | type_functions = (ei_data == ELFDATA2LSB | |
459 | ? &elf_little_32_functions | |
460 | : &elf_big_32_functions); | |
461 | break; | |
462 | ||
463 | case ELFCLASS64: | |
464 | #ifndef UNSIGNED_64BIT_TYPE | |
465 | *errmsg = "64-bit ELF objects not supported"; | |
466 | *err = 0; | |
467 | return NULL; | |
468 | #else | |
469 | type_functions = (ei_data == ELFDATA2LSB | |
470 | ? &elf_little_64_functions | |
471 | : &elf_big_64_functions); | |
472 | break; | |
473 | #endif | |
474 | ||
475 | default: | |
476 | *errmsg = "unrecognized ELF size"; | |
477 | *err = 0; | |
478 | return NULL; | |
479 | } | |
480 | ||
481 | if (!simple_object_internal_read (descriptor, offset, ehdr, sizeof ehdr, | |
482 | errmsg, err)) | |
483 | return NULL; | |
484 | ||
485 | eor = XNEW (struct simple_object_elf_read); | |
486 | eor->type_functions = type_functions; | |
487 | eor->ei_data = ei_data; | |
488 | eor->ei_class = ei_class; | |
489 | eor->ei_osabi = header[EI_OSABI]; | |
490 | eor->machine = ELF_FETCH_FIELD (type_functions, ei_class, Ehdr, ehdr, | |
491 | e_machine, Elf_Half); | |
492 | eor->flags = ELF_FETCH_FIELD (type_functions, ei_class, Ehdr, ehdr, | |
493 | e_flags, Elf_Word); | |
494 | eor->shoff = ELF_FETCH_FIELD (type_functions, ei_class, Ehdr, ehdr, | |
495 | e_shoff, Elf_Addr); | |
496 | eor->shnum = ELF_FETCH_FIELD (type_functions, ei_class, Ehdr, ehdr, | |
497 | e_shnum, Elf_Half); | |
498 | eor->shstrndx = ELF_FETCH_FIELD (type_functions, ei_class, Ehdr, ehdr, | |
499 | e_shstrndx, Elf_Half); | |
500 | ||
501 | if ((eor->shnum == 0 || eor->shstrndx == SHN_XINDEX) | |
502 | && eor->shoff != 0) | |
503 | { | |
504 | unsigned char shdr[sizeof (Elf64_External_Shdr)]; | |
505 | ||
506 | /* Object file has more than 0xffff sections. */ | |
507 | ||
508 | if (!simple_object_internal_read (descriptor, offset + eor->shoff, shdr, | |
509 | (ei_class == ELFCLASS32 | |
510 | ? sizeof (Elf32_External_Shdr) | |
511 | : sizeof (Elf64_External_Shdr)), | |
512 | errmsg, err)) | |
513 | { | |
514 | XDELETE (eor); | |
515 | return NULL; | |
516 | } | |
517 | ||
518 | if (eor->shnum == 0) | |
519 | eor->shnum = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
520 | shdr, sh_size, Elf_Addr); | |
521 | ||
522 | if (eor->shstrndx == SHN_XINDEX) | |
523 | { | |
524 | eor->shstrndx = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
525 | shdr, sh_link, Elf_Word); | |
526 | ||
527 | /* Versions of the GNU binutils between 2.12 and 2.18 did | |
528 | not handle objects with more than SHN_LORESERVE sections | |
529 | correctly. All large section indexes were offset by | |
530 | 0x100. There is more information at | |
531 | http://sourceware.org/bugzilla/show_bug.cgi?id-5900 . | |
532 | Fortunately these object files are easy to detect, as the | |
533 | GNU binutils always put the section header string table | |
534 | near the end of the list of sections. Thus if the | |
535 | section header string table index is larger than the | |
536 | number of sections, then we know we have to subtract | |
537 | 0x100 to get the real section index. */ | |
538 | if (eor->shstrndx >= eor->shnum | |
539 | && eor->shstrndx >= SHN_LORESERVE + 0x100) | |
540 | eor->shstrndx -= 0x100; | |
541 | } | |
542 | } | |
543 | ||
544 | if (eor->shstrndx >= eor->shnum) | |
545 | { | |
546 | *errmsg = "invalid ELF shstrndx >= shnum"; | |
547 | *err = 0; | |
548 | XDELETE (eor); | |
549 | return NULL; | |
550 | } | |
551 | ||
552 | return (void *) eor; | |
553 | } | |
554 | ||
555 | /* Find all sections in an ELF file. */ | |
556 | ||
557 | static const char * | |
558 | simple_object_elf_find_sections (simple_object_read *sobj, | |
559 | int (*pfn) (void *, const char *, | |
560 | off_t offset, off_t length), | |
561 | void *data, | |
562 | int *err) | |
563 | { | |
564 | struct simple_object_elf_read *eor = | |
565 | (struct simple_object_elf_read *) sobj->data; | |
566 | const struct elf_type_functions *type_functions = eor->type_functions; | |
567 | unsigned char ei_class = eor->ei_class; | |
568 | size_t shdr_size; | |
569 | unsigned int shnum; | |
570 | unsigned char *shdrs; | |
571 | const char *errmsg; | |
572 | unsigned char *shstrhdr; | |
573 | size_t name_size; | |
574 | off_t shstroff; | |
575 | unsigned char *names; | |
576 | unsigned int i; | |
577 | ||
578 | shdr_size = (ei_class == ELFCLASS32 | |
579 | ? sizeof (Elf32_External_Shdr) | |
580 | : sizeof (Elf64_External_Shdr)); | |
581 | ||
582 | /* Read the section headers. We skip section 0, which is not a | |
583 | useful section. */ | |
584 | ||
585 | shnum = eor->shnum; | |
586 | shdrs = XNEWVEC (unsigned char, shdr_size * (shnum - 1)); | |
587 | ||
588 | if (!simple_object_internal_read (sobj->descriptor, | |
589 | sobj->offset + eor->shoff + shdr_size, | |
590 | shdrs, | |
591 | shdr_size * (shnum - 1), | |
592 | &errmsg, err)) | |
593 | { | |
594 | XDELETEVEC (shdrs); | |
595 | return errmsg; | |
596 | } | |
597 | ||
598 | /* Read the section names. */ | |
599 | ||
600 | shstrhdr = shdrs + (eor->shstrndx - 1) * shdr_size; | |
601 | name_size = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
602 | shstrhdr, sh_size, Elf_Addr); | |
603 | shstroff = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
604 | shstrhdr, sh_offset, Elf_Addr); | |
605 | names = XNEWVEC (unsigned char, name_size); | |
606 | if (!simple_object_internal_read (sobj->descriptor, | |
607 | sobj->offset + shstroff, | |
608 | names, name_size, &errmsg, err)) | |
609 | { | |
610 | XDELETEVEC (names); | |
611 | XDELETEVEC (shdrs); | |
612 | return errmsg; | |
613 | } | |
614 | ||
615 | for (i = 1; i < shnum; ++i) | |
616 | { | |
617 | unsigned char *shdr; | |
618 | unsigned int sh_name; | |
619 | const char *name; | |
620 | off_t offset; | |
621 | off_t length; | |
622 | ||
623 | shdr = shdrs + (i - 1) * shdr_size; | |
624 | sh_name = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
625 | shdr, sh_name, Elf_Word); | |
626 | if (sh_name >= name_size) | |
627 | { | |
628 | *err = 0; | |
629 | XDELETEVEC (names); | |
630 | XDELETEVEC (shdrs); | |
631 | return "ELF section name out of range"; | |
632 | } | |
633 | ||
634 | name = (const char *) names + sh_name; | |
635 | offset = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
636 | shdr, sh_offset, Elf_Addr); | |
637 | length = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
638 | shdr, sh_size, Elf_Addr); | |
639 | ||
640 | if (!(*pfn) (data, name, offset, length)) | |
641 | break; | |
642 | } | |
643 | ||
644 | XDELETEVEC (names); | |
645 | XDELETEVEC (shdrs); | |
646 | ||
647 | return NULL; | |
648 | } | |
649 | ||
650 | /* Fetch the attributes for an simple_object_read. */ | |
651 | ||
652 | static void * | |
653 | simple_object_elf_fetch_attributes (simple_object_read *sobj, | |
654 | const char **errmsg ATTRIBUTE_UNUSED, | |
655 | int *err ATTRIBUTE_UNUSED) | |
656 | { | |
657 | struct simple_object_elf_read *eor = | |
658 | (struct simple_object_elf_read *) sobj->data; | |
659 | struct simple_object_elf_attributes *ret; | |
660 | ||
661 | ret = XNEW (struct simple_object_elf_attributes); | |
662 | ret->type_functions = eor->type_functions; | |
663 | ret->ei_data = eor->ei_data; | |
664 | ret->ei_class = eor->ei_class; | |
665 | ret->ei_osabi = eor->ei_osabi; | |
666 | ret->machine = eor->machine; | |
667 | ret->flags = eor->flags; | |
668 | return ret; | |
669 | } | |
670 | ||
671 | /* Release the privata data for an simple_object_read. */ | |
672 | ||
673 | static void | |
674 | simple_object_elf_release_read (void *data) | |
675 | { | |
676 | XDELETE (data); | |
677 | } | |
678 | ||
679 | /* Compare two attributes structures. */ | |
680 | ||
681 | static const char * | |
f9e6589d | 682 | simple_object_elf_attributes_merge (void *todata, void *fromdata, int *err) |
ffa54e5c | 683 | { |
f9e6589d DD |
684 | struct simple_object_elf_attributes *to = |
685 | (struct simple_object_elf_attributes *) todata; | |
686 | struct simple_object_elf_attributes *from = | |
687 | (struct simple_object_elf_attributes *) fromdata; | |
688 | ||
689 | if (to->ei_data != from->ei_data || to->ei_class != from->ei_class) | |
ffa54e5c DD |
690 | { |
691 | *err = 0; | |
692 | return "ELF object format mismatch"; | |
693 | } | |
f9e6589d DD |
694 | |
695 | if (to->machine != from->machine) | |
696 | { | |
697 | int ok; | |
698 | ||
699 | /* EM_SPARC and EM_SPARC32PLUS are compatible and force an | |
700 | output of EM_SPARC32PLUS. */ | |
701 | ok = 0; | |
702 | switch (to->machine) | |
703 | { | |
704 | case EM_SPARC: | |
705 | if (from->machine == EM_SPARC32PLUS) | |
706 | { | |
707 | to->machine = from->machine; | |
708 | ok = 1; | |
709 | } | |
710 | break; | |
711 | ||
712 | case EM_SPARC32PLUS: | |
713 | if (from->machine == EM_SPARC) | |
714 | ok = 1; | |
715 | break; | |
716 | ||
717 | default: | |
718 | break; | |
719 | } | |
720 | ||
721 | if (!ok) | |
722 | { | |
723 | *err = 0; | |
724 | return "ELF machine number mismatch"; | |
725 | } | |
726 | } | |
727 | ||
ffa54e5c DD |
728 | return NULL; |
729 | } | |
730 | ||
731 | /* Release the private data for an attributes structure. */ | |
732 | ||
733 | static void | |
734 | simple_object_elf_release_attributes (void *data) | |
735 | { | |
736 | XDELETE (data); | |
737 | } | |
738 | ||
739 | /* Prepare to write out a file. */ | |
740 | ||
741 | static void * | |
742 | simple_object_elf_start_write (void *attributes_data, | |
743 | const char **errmsg ATTRIBUTE_UNUSED, | |
744 | int *err ATTRIBUTE_UNUSED) | |
745 | { | |
746 | struct simple_object_elf_attributes *attrs = | |
747 | (struct simple_object_elf_attributes *) attributes_data; | |
f8ad2513 | 748 | struct simple_object_elf_write *ret; |
ffa54e5c DD |
749 | |
750 | /* We're just going to record the attributes, but we need to make a | |
751 | copy because the user may delete them. */ | |
f8ad2513 NC |
752 | ret = XNEW (struct simple_object_elf_write); |
753 | ret->attrs = *attrs; | |
754 | ret->shdrs = NULL; | |
ffa54e5c DD |
755 | return ret; |
756 | } | |
757 | ||
758 | /* Write out an ELF ehdr. */ | |
759 | ||
760 | static int | |
761 | simple_object_elf_write_ehdr (simple_object_write *sobj, int descriptor, | |
762 | const char **errmsg, int *err) | |
763 | { | |
764 | struct simple_object_elf_attributes *attrs = | |
765 | (struct simple_object_elf_attributes *) sobj->data; | |
766 | const struct elf_type_functions* fns; | |
767 | unsigned char cl; | |
768 | size_t ehdr_size; | |
769 | unsigned char buf[sizeof (Elf64_External_Ehdr)]; | |
770 | simple_object_write_section *section; | |
771 | unsigned int shnum; | |
b55f9678 | 772 | unsigned int shstrndx; |
ffa54e5c DD |
773 | |
774 | fns = attrs->type_functions; | |
775 | cl = attrs->ei_class; | |
776 | ||
777 | shnum = 0; | |
778 | for (section = sobj->sections; section != NULL; section = section->next) | |
779 | ++shnum; | |
780 | if (shnum > 0) | |
781 | { | |
782 | /* Add a section header for the dummy section and one for | |
783 | .shstrtab. */ | |
784 | shnum += 2; | |
785 | } | |
786 | ||
787 | ehdr_size = (cl == ELFCLASS32 | |
788 | ? sizeof (Elf32_External_Ehdr) | |
789 | : sizeof (Elf64_External_Ehdr)); | |
790 | memset (buf, 0, sizeof (Elf64_External_Ehdr)); | |
791 | ||
792 | buf[EI_MAG0] = ELFMAG0; | |
793 | buf[EI_MAG1] = ELFMAG1; | |
794 | buf[EI_MAG2] = ELFMAG2; | |
795 | buf[EI_MAG3] = ELFMAG3; | |
796 | buf[EI_CLASS] = cl; | |
797 | buf[EI_DATA] = attrs->ei_data; | |
798 | buf[EI_VERSION] = EV_CURRENT; | |
799 | buf[EI_OSABI] = attrs->ei_osabi; | |
800 | ||
801 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_type, Elf_Half, ET_REL); | |
802 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_machine, Elf_Half, attrs->machine); | |
803 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_version, Elf_Word, EV_CURRENT); | |
804 | /* e_entry left as zero. */ | |
805 | /* e_phoff left as zero. */ | |
806 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_shoff, Elf_Addr, ehdr_size); | |
807 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_flags, Elf_Word, attrs->flags); | |
808 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_ehsize, Elf_Half, ehdr_size); | |
809 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_phentsize, Elf_Half, | |
810 | (cl == ELFCLASS32 | |
811 | ? sizeof (Elf32_External_Phdr) | |
812 | : sizeof (Elf64_External_Phdr))); | |
813 | /* e_phnum left as zero. */ | |
814 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_shentsize, Elf_Half, | |
815 | (cl == ELFCLASS32 | |
816 | ? sizeof (Elf32_External_Shdr) | |
817 | : sizeof (Elf64_External_Shdr))); | |
b55f9678 IB |
818 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_shnum, Elf_Half, |
819 | shnum >= SHN_LORESERVE ? 0 : shnum); | |
820 | if (shnum == 0) | |
821 | shstrndx = 0; | |
822 | else | |
823 | { | |
824 | shstrndx = shnum - 1; | |
825 | if (shstrndx >= SHN_LORESERVE) | |
826 | shstrndx = SHN_XINDEX; | |
827 | } | |
828 | ELF_SET_FIELD (fns, cl, Ehdr, buf, e_shstrndx, Elf_Half, shstrndx); | |
ffa54e5c DD |
829 | |
830 | return simple_object_internal_write (descriptor, 0, buf, ehdr_size, | |
831 | errmsg, err); | |
832 | } | |
833 | ||
834 | /* Write out an ELF shdr. */ | |
835 | ||
836 | static int | |
837 | simple_object_elf_write_shdr (simple_object_write *sobj, int descriptor, | |
838 | off_t offset, unsigned int sh_name, | |
839 | unsigned int sh_type, unsigned int sh_flags, | |
f8ad2513 | 840 | off_t sh_addr, |
ffa54e5c | 841 | unsigned int sh_offset, unsigned int sh_size, |
f8ad2513 NC |
842 | unsigned int sh_link, unsigned int sh_info, |
843 | size_t sh_addralign, | |
844 | size_t sh_entsize, | |
b55f9678 | 845 | const char **errmsg, int *err) |
ffa54e5c DD |
846 | { |
847 | struct simple_object_elf_attributes *attrs = | |
848 | (struct simple_object_elf_attributes *) sobj->data; | |
849 | const struct elf_type_functions* fns; | |
850 | unsigned char cl; | |
851 | size_t shdr_size; | |
852 | unsigned char buf[sizeof (Elf64_External_Shdr)]; | |
853 | ||
854 | fns = attrs->type_functions; | |
855 | cl = attrs->ei_class; | |
856 | ||
857 | shdr_size = (cl == ELFCLASS32 | |
858 | ? sizeof (Elf32_External_Shdr) | |
859 | : sizeof (Elf64_External_Shdr)); | |
860 | memset (buf, 0, sizeof (Elf64_External_Shdr)); | |
861 | ||
862 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_name, Elf_Word, sh_name); | |
863 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_type, Elf_Word, sh_type); | |
864 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_flags, Elf_Addr, sh_flags); | |
f8ad2513 | 865 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_addr, Elf_Addr, sh_addr); |
ffa54e5c DD |
866 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_offset, Elf_Addr, sh_offset); |
867 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_size, Elf_Addr, sh_size); | |
b55f9678 | 868 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_link, Elf_Word, sh_link); |
f8ad2513 | 869 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_info, Elf_Word, sh_info); |
ffa54e5c | 870 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_addralign, Elf_Addr, sh_addralign); |
f8ad2513 | 871 | ELF_SET_FIELD (fns, cl, Shdr, buf, sh_entsize, Elf_Addr, sh_entsize); |
ffa54e5c DD |
872 | |
873 | return simple_object_internal_write (descriptor, offset, buf, shdr_size, | |
874 | errmsg, err); | |
875 | } | |
876 | ||
877 | /* Write out a complete ELF file. | |
878 | Ehdr | |
879 | initial dummy Shdr | |
880 | user-created Shdrs | |
881 | .shstrtab Shdr | |
882 | user-created section data | |
883 | .shstrtab data */ | |
884 | ||
885 | static const char * | |
886 | simple_object_elf_write_to_file (simple_object_write *sobj, int descriptor, | |
887 | int *err) | |
888 | { | |
f8ad2513 NC |
889 | struct simple_object_elf_write *eow = |
890 | (struct simple_object_elf_write *) sobj->data; | |
891 | struct simple_object_elf_attributes *attrs = &eow->attrs; | |
ffa54e5c DD |
892 | unsigned char cl; |
893 | size_t ehdr_size; | |
894 | size_t shdr_size; | |
895 | const char *errmsg; | |
896 | simple_object_write_section *section; | |
897 | unsigned int shnum; | |
898 | size_t shdr_offset; | |
899 | size_t sh_offset; | |
b55f9678 IB |
900 | unsigned int first_sh_size; |
901 | unsigned int first_sh_link; | |
ffa54e5c DD |
902 | size_t sh_name; |
903 | unsigned char zero; | |
f8ad2513 | 904 | unsigned secnum; |
ffa54e5c DD |
905 | |
906 | if (!simple_object_elf_write_ehdr (sobj, descriptor, &errmsg, err)) | |
907 | return errmsg; | |
908 | ||
909 | cl = attrs->ei_class; | |
910 | if (cl == ELFCLASS32) | |
911 | { | |
912 | ehdr_size = sizeof (Elf32_External_Ehdr); | |
913 | shdr_size = sizeof (Elf32_External_Shdr); | |
914 | } | |
915 | else | |
916 | { | |
917 | ehdr_size = sizeof (Elf64_External_Ehdr); | |
918 | shdr_size = sizeof (Elf64_External_Shdr); | |
919 | } | |
920 | ||
921 | shnum = 0; | |
922 | for (section = sobj->sections; section != NULL; section = section->next) | |
923 | ++shnum; | |
924 | if (shnum == 0) | |
925 | return NULL; | |
926 | ||
927 | /* Add initial dummy Shdr and .shstrtab. */ | |
928 | shnum += 2; | |
929 | ||
930 | shdr_offset = ehdr_size; | |
931 | sh_offset = shdr_offset + shnum * shdr_size; | |
932 | ||
b55f9678 IB |
933 | if (shnum < SHN_LORESERVE) |
934 | first_sh_size = 0; | |
935 | else | |
936 | first_sh_size = shnum; | |
937 | if (shnum - 1 < SHN_LORESERVE) | |
938 | first_sh_link = 0; | |
939 | else | |
940 | first_sh_link = shnum - 1; | |
ffa54e5c | 941 | if (!simple_object_elf_write_shdr (sobj, descriptor, shdr_offset, |
f8ad2513 NC |
942 | 0, 0, 0, 0, 0, first_sh_size, first_sh_link, |
943 | 0, 0, 0, &errmsg, err)) | |
ffa54e5c DD |
944 | return errmsg; |
945 | ||
946 | shdr_offset += shdr_size; | |
947 | ||
948 | sh_name = 1; | |
f8ad2513 | 949 | secnum = 0; |
ffa54e5c DD |
950 | for (section = sobj->sections; section != NULL; section = section->next) |
951 | { | |
952 | size_t mask; | |
953 | size_t new_sh_offset; | |
954 | size_t sh_size; | |
955 | struct simple_object_write_section_buffer *buffer; | |
f8ad2513 NC |
956 | unsigned int sh_type = SHT_PROGBITS; |
957 | unsigned int sh_flags = 0; | |
958 | off_t sh_addr = 0; | |
959 | unsigned int sh_link = 0; | |
960 | unsigned int sh_info = 0; | |
961 | size_t sh_addralign = 1U << section->align; | |
962 | size_t sh_entsize = 0; | |
963 | if (eow->shdrs) | |
964 | { | |
965 | sh_type = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, | |
966 | eow->shdrs + secnum * shdr_size, | |
967 | sh_type, Elf_Word); | |
968 | sh_flags = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, | |
969 | eow->shdrs + secnum * shdr_size, | |
970 | sh_flags, Elf_Addr); | |
971 | sh_addr = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, | |
972 | eow->shdrs + secnum * shdr_size, | |
973 | sh_addr, Elf_Addr); | |
974 | sh_link = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, | |
975 | eow->shdrs + secnum * shdr_size, | |
976 | sh_link, Elf_Word); | |
977 | sh_info = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, | |
978 | eow->shdrs + secnum * shdr_size, | |
979 | sh_info, Elf_Word); | |
980 | sh_addralign = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, | |
981 | eow->shdrs + secnum * shdr_size, | |
982 | sh_addralign, Elf_Addr); | |
983 | sh_entsize = ELF_FETCH_FIELD (attrs->type_functions, attrs->ei_class, Shdr, | |
984 | eow->shdrs + secnum * shdr_size, | |
985 | sh_entsize, Elf_Addr); | |
986 | secnum++; | |
987 | } | |
ffa54e5c | 988 | |
f8ad2513 | 989 | mask = sh_addralign - 1; |
ffa54e5c DD |
990 | new_sh_offset = sh_offset + mask; |
991 | new_sh_offset &= ~ mask; | |
992 | while (new_sh_offset > sh_offset) | |
993 | { | |
994 | unsigned char zeroes[16]; | |
995 | size_t write; | |
996 | ||
997 | memset (zeroes, 0, sizeof zeroes); | |
998 | write = new_sh_offset - sh_offset; | |
999 | if (write > sizeof zeroes) | |
1000 | write = sizeof zeroes; | |
1001 | if (!simple_object_internal_write (descriptor, sh_offset, zeroes, | |
1002 | write, &errmsg, err)) | |
1003 | return errmsg; | |
1004 | sh_offset += write; | |
1005 | } | |
1006 | ||
1007 | sh_size = 0; | |
1008 | for (buffer = section->buffers; buffer != NULL; buffer = buffer->next) | |
1009 | { | |
1010 | if (!simple_object_internal_write (descriptor, sh_offset + sh_size, | |
1011 | ((const unsigned char *) | |
1012 | buffer->buffer), | |
1013 | buffer->size, &errmsg, err)) | |
1014 | return errmsg; | |
1015 | sh_size += buffer->size; | |
1016 | } | |
1017 | ||
1018 | if (!simple_object_elf_write_shdr (sobj, descriptor, shdr_offset, | |
f8ad2513 NC |
1019 | sh_name, sh_type, sh_flags, |
1020 | sh_addr, sh_offset, | |
1021 | sh_size, sh_link, sh_info, | |
1022 | sh_addralign, sh_entsize, | |
ffa54e5c DD |
1023 | &errmsg, err)) |
1024 | return errmsg; | |
1025 | ||
1026 | shdr_offset += shdr_size; | |
1027 | sh_name += strlen (section->name) + 1; | |
1028 | sh_offset += sh_size; | |
1029 | } | |
1030 | ||
1031 | if (!simple_object_elf_write_shdr (sobj, descriptor, shdr_offset, | |
f8ad2513 NC |
1032 | sh_name, SHT_STRTAB, 0, 0, sh_offset, |
1033 | sh_name + strlen (".shstrtab") + 1, 0, 0, | |
1034 | 1, 0, &errmsg, err)) | |
ffa54e5c DD |
1035 | return errmsg; |
1036 | ||
1037 | /* .shstrtab has a leading zero byte. */ | |
1038 | zero = 0; | |
1039 | if (!simple_object_internal_write (descriptor, sh_offset, &zero, 1, | |
1040 | &errmsg, err)) | |
1041 | return errmsg; | |
1042 | ++sh_offset; | |
1043 | ||
1044 | for (section = sobj->sections; section != NULL; section = section->next) | |
1045 | { | |
1046 | size_t len; | |
1047 | ||
1048 | len = strlen (section->name) + 1; | |
1049 | if (!simple_object_internal_write (descriptor, sh_offset, | |
1050 | (const unsigned char *) section->name, | |
1051 | len, &errmsg, err)) | |
1052 | return errmsg; | |
1053 | sh_offset += len; | |
1054 | } | |
1055 | ||
1056 | if (!simple_object_internal_write (descriptor, sh_offset, | |
1057 | (const unsigned char *) ".shstrtab", | |
1058 | strlen (".shstrtab") + 1, &errmsg, err)) | |
1059 | return errmsg; | |
1060 | ||
1061 | return NULL; | |
1062 | } | |
1063 | ||
1064 | /* Release the private data for an simple_object_write structure. */ | |
1065 | ||
1066 | static void | |
1067 | simple_object_elf_release_write (void *data) | |
1068 | { | |
f8ad2513 NC |
1069 | struct simple_object_elf_write *eow = (struct simple_object_elf_write *) data; |
1070 | if (eow->shdrs) | |
1071 | XDELETE (eow->shdrs); | |
ffa54e5c DD |
1072 | XDELETE (data); |
1073 | } | |
1074 | ||
f8ad2513 NC |
1075 | /* Copy all sections in an ELF file. */ |
1076 | ||
1077 | static const char * | |
1078 | simple_object_elf_copy_lto_debug_sections (simple_object_read *sobj, | |
1079 | simple_object_write *dobj, | |
e9301e76 | 1080 | char *(*pfn) (const char *), |
f8ad2513 NC |
1081 | int *err) |
1082 | { | |
1083 | struct simple_object_elf_read *eor = | |
1084 | (struct simple_object_elf_read *) sobj->data; | |
1085 | const struct elf_type_functions *type_functions = eor->type_functions; | |
1086 | struct simple_object_elf_write *eow = | |
1087 | (struct simple_object_elf_write *) dobj->data; | |
1088 | unsigned char ei_class = eor->ei_class; | |
1089 | size_t shdr_size; | |
1090 | unsigned int shnum; | |
1091 | unsigned char *shdrs; | |
1092 | const char *errmsg; | |
1093 | unsigned char *shstrhdr; | |
1094 | size_t name_size; | |
1095 | off_t shstroff; | |
1096 | unsigned char *names; | |
1097 | unsigned int i; | |
2a8ae714 | 1098 | int changed; |
f8ad2513 NC |
1099 | int *pfnret; |
1100 | const char **pfnname; | |
e9301e76 NC |
1101 | unsigned new_i; |
1102 | unsigned *sh_map; | |
2a8ae714 | 1103 | unsigned first_shndx = 0; |
e9301e76 | 1104 | unsigned int *symtab_indices_shndx; |
f8ad2513 NC |
1105 | |
1106 | shdr_size = (ei_class == ELFCLASS32 | |
1107 | ? sizeof (Elf32_External_Shdr) | |
1108 | : sizeof (Elf64_External_Shdr)); | |
1109 | ||
1110 | /* Read the section headers. We skip section 0, which is not a | |
1111 | useful section. */ | |
1112 | ||
1113 | shnum = eor->shnum; | |
1114 | shdrs = XNEWVEC (unsigned char, shdr_size * (shnum - 1)); | |
1115 | ||
1116 | if (!simple_object_internal_read (sobj->descriptor, | |
1117 | sobj->offset + eor->shoff + shdr_size, | |
1118 | shdrs, | |
1119 | shdr_size * (shnum - 1), | |
1120 | &errmsg, err)) | |
1121 | { | |
1122 | XDELETEVEC (shdrs); | |
1123 | return errmsg; | |
1124 | } | |
1125 | ||
1126 | /* Read the section names. */ | |
1127 | ||
1128 | shstrhdr = shdrs + (eor->shstrndx - 1) * shdr_size; | |
1129 | name_size = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1130 | shstrhdr, sh_size, Elf_Addr); | |
1131 | shstroff = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1132 | shstrhdr, sh_offset, Elf_Addr); | |
1133 | names = XNEWVEC (unsigned char, name_size); | |
1134 | if (!simple_object_internal_read (sobj->descriptor, | |
1135 | sobj->offset + shstroff, | |
1136 | names, name_size, &errmsg, err)) | |
1137 | { | |
1138 | XDELETEVEC (names); | |
1139 | XDELETEVEC (shdrs); | |
1140 | return errmsg; | |
1141 | } | |
1142 | ||
f8ad2513 NC |
1143 | pfnret = XNEWVEC (int, shnum); |
1144 | pfnname = XNEWVEC (const char *, shnum); | |
1145 | ||
e9301e76 NC |
1146 | /* Map of symtab to index section. */ |
1147 | symtab_indices_shndx = XCNEWVEC (unsigned int, shnum - 1); | |
1148 | ||
f8ad2513 NC |
1149 | /* First perform the callbacks to know which sections to preserve and |
1150 | what name to use for those. */ | |
1151 | for (i = 1; i < shnum; ++i) | |
1152 | { | |
1153 | unsigned char *shdr; | |
e9301e76 | 1154 | unsigned int sh_name, sh_type; |
f8ad2513 | 1155 | const char *name; |
e9301e76 | 1156 | char *ret; |
f8ad2513 NC |
1157 | |
1158 | shdr = shdrs + (i - 1) * shdr_size; | |
1159 | sh_name = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1160 | shdr, sh_name, Elf_Word); | |
1161 | if (sh_name >= name_size) | |
1162 | { | |
1163 | *err = 0; | |
1164 | XDELETEVEC (names); | |
1165 | XDELETEVEC (shdrs); | |
1166 | return "ELF section name out of range"; | |
1167 | } | |
1168 | ||
1169 | name = (const char *) names + sh_name; | |
1170 | ||
e9301e76 NC |
1171 | ret = (*pfn) (name); |
1172 | pfnret[i - 1] = ret == NULL ? -1 : 0; | |
1173 | pfnname[i - 1] = ret == NULL ? name : ret; | |
2a8ae714 NC |
1174 | if (first_shndx == 0 |
1175 | && pfnret[i - 1] == 0) | |
1176 | first_shndx = i; | |
e9301e76 NC |
1177 | |
1178 | /* Remember the indexes of existing SHT_SYMTAB_SHNDX sections. */ | |
1179 | sh_type = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1180 | shdr, sh_type, Elf_Word); | |
1181 | if (sh_type == SHT_SYMTAB_SHNDX) | |
1182 | { | |
1183 | unsigned int sh_link; | |
1184 | sh_link = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1185 | shdr, sh_link, Elf_Word); | |
1186 | symtab_indices_shndx[sh_link - 1] = i; | |
1187 | /* Always discard the extended index sections, after | |
1188 | copying it will not be needed. This way we don't need to | |
1189 | update it and deal with the ordering constraints of | |
1190 | processing the existing symtab and changing the index. */ | |
1191 | pfnret[i - 1] = -1; | |
1192 | } | |
f8ad2513 NC |
1193 | } |
1194 | ||
1195 | /* Mark sections as preserved that are required by to be preserved | |
1196 | sections. */ | |
26a67918 | 1197 | do |
f8ad2513 | 1198 | { |
26a67918 PA |
1199 | changed = 0; |
1200 | for (i = 1; i < shnum; ++i) | |
f8ad2513 | 1201 | { |
26a67918 PA |
1202 | unsigned char *shdr; |
1203 | unsigned int sh_type, sh_info, sh_link; | |
1204 | off_t offset; | |
1205 | off_t length; | |
1206 | ||
1207 | shdr = shdrs + (i - 1) * shdr_size; | |
1208 | sh_type = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1209 | shdr, sh_type, Elf_Word); | |
1210 | sh_info = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1211 | shdr, sh_info, Elf_Word); | |
1212 | sh_link = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1213 | shdr, sh_link, Elf_Word); | |
1214 | if (sh_type == SHT_GROUP) | |
f8ad2513 | 1215 | { |
26a67918 PA |
1216 | /* Mark groups containing copied sections. */ |
1217 | unsigned entsize = ELF_FETCH_FIELD (type_functions, ei_class, | |
1218 | Shdr, shdr, sh_entsize, | |
1219 | Elf_Addr); | |
1220 | unsigned char *ent, *buf; | |
1221 | int keep = 0; | |
1222 | offset = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1223 | shdr, sh_offset, Elf_Addr); | |
1224 | length = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1225 | shdr, sh_size, Elf_Addr); | |
1226 | buf = XNEWVEC (unsigned char, length); | |
1227 | if (!simple_object_internal_read (sobj->descriptor, | |
1228 | sobj->offset + offset, buf, | |
1229 | (size_t) length, &errmsg, err)) | |
1230 | { | |
1231 | XDELETEVEC (buf); | |
1232 | XDELETEVEC (names); | |
1233 | XDELETEVEC (shdrs); | |
1234 | return errmsg; | |
1235 | } | |
1236 | for (ent = buf + entsize; ent < buf + length; ent += entsize) | |
1237 | { | |
1238 | unsigned sec = type_functions->fetch_Elf_Word (ent); | |
1239 | if (pfnret[sec - 1] == 0) | |
1240 | keep = 1; | |
1241 | } | |
1242 | if (keep) | |
1243 | { | |
1244 | changed |= (pfnret[sh_link - 1] == -1 | |
1245 | || pfnret[i - 1] == -1); | |
1246 | pfnret[sh_link - 1] = 0; | |
1247 | pfnret[i - 1] = 0; | |
1248 | } | |
f8ad2513 | 1249 | } |
26a67918 PA |
1250 | if (sh_type == SHT_RELA |
1251 | || sh_type == SHT_REL) | |
f8ad2513 | 1252 | { |
26a67918 PA |
1253 | /* Mark relocation sections and symtab of copied sections. */ |
1254 | if (pfnret[sh_info - 1] == 0) | |
1255 | { | |
1256 | changed |= (pfnret[sh_link - 1] == -1 | |
1257 | || pfnret[i - 1] == -1); | |
1258 | pfnret[sh_link - 1] = 0; | |
1259 | pfnret[i - 1] = 0; | |
1260 | } | |
f8ad2513 | 1261 | } |
26a67918 | 1262 | if (sh_type == SHT_SYMTAB) |
f8ad2513 | 1263 | { |
26a67918 PA |
1264 | /* Mark strings sections of copied symtabs. */ |
1265 | if (pfnret[i - 1] == 0) | |
1266 | { | |
1267 | changed |= pfnret[sh_link - 1] == -1; | |
1268 | pfnret[sh_link - 1] = 0; | |
1269 | } | |
f8ad2513 NC |
1270 | } |
1271 | } | |
f8ad2513 | 1272 | } |
26a67918 | 1273 | while (changed); |
f8ad2513 | 1274 | |
e9301e76 NC |
1275 | /* Compute a mapping of old -> new section numbers. */ |
1276 | sh_map = XNEWVEC (unsigned, shnum); | |
1277 | sh_map[0] = 0; | |
1278 | new_i = 1; | |
1279 | for (i = 1; i < shnum; ++i) | |
1280 | { | |
1281 | if (pfnret[i - 1] == -1) | |
1282 | sh_map[i] = 0; | |
1283 | else | |
1284 | sh_map[i] = new_i++; | |
1285 | } | |
1286 | if (new_i - 1 >= SHN_LORESERVE) | |
1287 | { | |
1288 | *err = ENOTSUP; | |
1289 | return "Too many copied sections"; | |
1290 | } | |
1291 | eow->shdrs = XNEWVEC (unsigned char, shdr_size * (new_i - 1)); | |
1292 | ||
f8ad2513 | 1293 | /* Then perform the actual copying. */ |
e9301e76 | 1294 | new_i = 0; |
f8ad2513 NC |
1295 | for (i = 1; i < shnum; ++i) |
1296 | { | |
1297 | unsigned char *shdr; | |
1298 | unsigned int sh_name, sh_type; | |
1299 | const char *name; | |
1300 | off_t offset; | |
1301 | off_t length; | |
f8ad2513 NC |
1302 | simple_object_write_section *dest; |
1303 | off_t flags; | |
1304 | unsigned char *buf; | |
1305 | ||
e9301e76 NC |
1306 | if (pfnret[i - 1]) |
1307 | continue; | |
1308 | ||
1309 | new_i++; | |
f8ad2513 NC |
1310 | shdr = shdrs + (i - 1) * shdr_size; |
1311 | sh_name = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1312 | shdr, sh_name, Elf_Word); | |
1313 | if (sh_name >= name_size) | |
1314 | { | |
1315 | *err = 0; | |
1316 | XDELETEVEC (names); | |
1317 | XDELETEVEC (shdrs); | |
e9301e76 | 1318 | XDELETEVEC (symtab_indices_shndx); |
f8ad2513 NC |
1319 | return "ELF section name out of range"; |
1320 | } | |
1321 | ||
e9301e76 | 1322 | name = pfnname[i - 1]; |
f8ad2513 NC |
1323 | offset = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
1324 | shdr, sh_offset, Elf_Addr); | |
1325 | length = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1326 | shdr, sh_size, Elf_Addr); | |
1327 | sh_type = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1328 | shdr, sh_type, Elf_Word); | |
1329 | ||
e9301e76 NC |
1330 | dest = simple_object_write_create_section (dobj, pfnname[i - 1], |
1331 | 0, &errmsg, err); | |
f8ad2513 NC |
1332 | if (dest == NULL) |
1333 | { | |
1334 | XDELETEVEC (names); | |
1335 | XDELETEVEC (shdrs); | |
e9301e76 | 1336 | XDELETEVEC (symtab_indices_shndx); |
f8ad2513 NC |
1337 | return errmsg; |
1338 | } | |
1339 | ||
1340 | /* Record the SHDR of the source. */ | |
e9301e76 NC |
1341 | memcpy (eow->shdrs + (new_i - 1) * shdr_size, shdr, shdr_size); |
1342 | shdr = eow->shdrs + (new_i - 1) * shdr_size; | |
f8ad2513 NC |
1343 | |
1344 | /* Copy the data. | |
1345 | ??? This is quite wasteful and ideally would be delayed until | |
1346 | write_to_file (). Thus it questions the interfacing | |
1347 | which eventually should contain destination creation plus | |
1348 | writing. */ | |
e9301e76 NC |
1349 | buf = XNEWVEC (unsigned char, length); |
1350 | if (!simple_object_internal_read (sobj->descriptor, | |
1351 | sobj->offset + offset, buf, | |
1352 | (size_t) length, &errmsg, err)) | |
1353 | { | |
1354 | XDELETEVEC (buf); | |
1355 | XDELETEVEC (names); | |
1356 | XDELETEVEC (shdrs); | |
1357 | XDELETEVEC (symtab_indices_shndx); | |
1358 | return errmsg; | |
1359 | } | |
1360 | ||
1361 | /* If we are processing .symtab purge __gnu_lto_v1 and | |
1362 | __gnu_lto_slim symbols from it and any symbols in discarded | |
f8ad2513 | 1363 | sections. */ |
e9301e76 | 1364 | if (sh_type == SHT_SYMTAB) |
f8ad2513 | 1365 | { |
e9301e76 NC |
1366 | unsigned entsize = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, |
1367 | shdr, sh_entsize, Elf_Addr); | |
1368 | unsigned strtab = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1369 | shdr, sh_link, Elf_Word); | |
1370 | unsigned char *strshdr = shdrs + (strtab - 1) * shdr_size; | |
1371 | off_t stroff = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1372 | strshdr, sh_offset, Elf_Addr); | |
1373 | size_t strsz = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1374 | strshdr, sh_size, Elf_Addr); | |
1375 | char *strings = XNEWVEC (char, strsz); | |
1376 | char *gnu_lto = strings; | |
1377 | unsigned char *ent; | |
1378 | unsigned *shndx_table = NULL; | |
1379 | simple_object_internal_read (sobj->descriptor, | |
1380 | sobj->offset + stroff, | |
1381 | (unsigned char *)strings, | |
1382 | strsz, &errmsg, err); | |
1383 | /* Find gnu_lto_ in strings. */ | |
1384 | while ((gnu_lto = (char *) memchr (gnu_lto, 'g', | |
1385 | strings + strsz - gnu_lto))) | |
1386 | if (strncmp (gnu_lto, "gnu_lto_v1", | |
1387 | strings + strsz - gnu_lto) == 0) | |
1388 | break; | |
1389 | else | |
1390 | gnu_lto++; | |
1391 | /* Read the section index table if present. */ | |
1392 | if (symtab_indices_shndx[i - 1] != 0) | |
f8ad2513 | 1393 | { |
e9301e76 NC |
1394 | unsigned char *sidxhdr = shdrs + (strtab - 1) * shdr_size; |
1395 | off_t sidxoff = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1396 | sidxhdr, sh_offset, Elf_Addr); | |
1397 | size_t sidxsz = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1398 | sidxhdr, sh_size, Elf_Addr); | |
1399 | shndx_table = (unsigned *)XNEWVEC (char, sidxsz); | |
1400 | simple_object_internal_read (sobj->descriptor, | |
1401 | sobj->offset + sidxoff, | |
1402 | (unsigned char *)shndx_table, | |
1403 | sidxsz, &errmsg, err); | |
f8ad2513 | 1404 | } |
e9301e76 | 1405 | for (ent = buf; ent < buf + length; ent += entsize) |
f8ad2513 | 1406 | { |
e9301e76 NC |
1407 | unsigned st_shndx = ELF_FETCH_FIELD (type_functions, ei_class, |
1408 | Sym, ent, | |
1409 | st_shndx, Elf_Half); | |
1410 | unsigned raw_st_shndx = st_shndx; | |
1411 | unsigned char *st_info; | |
1412 | unsigned char *st_other; | |
1413 | int discard = 0; | |
1414 | if (ei_class == ELFCLASS32) | |
f8ad2513 | 1415 | { |
e9301e76 NC |
1416 | st_info = &((Elf32_External_Sym *)ent)->st_info; |
1417 | st_other = &((Elf32_External_Sym *)ent)->st_other; | |
1418 | } | |
1419 | else | |
1420 | { | |
1421 | st_info = &((Elf64_External_Sym *)ent)->st_info; | |
1422 | st_other = &((Elf64_External_Sym *)ent)->st_other; | |
1423 | } | |
1424 | if (st_shndx == SHN_XINDEX) | |
1425 | st_shndx = type_functions->fetch_Elf_Word | |
1426 | ((unsigned char *)(shndx_table + (ent - buf) / entsize)); | |
1427 | /* Eliminate all COMMONs - this includes __gnu_lto_v1 | |
1428 | and __gnu_lto_slim which otherwise cause endless | |
1429 | LTO plugin invocation. */ | |
1430 | if (st_shndx == SHN_COMMON) | |
1431 | discard = 1; | |
1432 | /* We also need to remove symbols refering to sections | |
1433 | we'll eventually remove as with fat LTO objects | |
1434 | we otherwise get duplicate symbols at final link | |
1435 | (with GNU ld, gold is fine and ignores symbols in | |
1436 | sections marked as EXCLUDE). ld/20513 */ | |
1437 | else if (st_shndx != SHN_UNDEF | |
1438 | && st_shndx < shnum | |
1439 | && pfnret[st_shndx - 1] == -1) | |
1440 | discard = 1; | |
1441 | ||
1442 | if (discard) | |
1443 | { | |
1444 | /* Make discarded symbols undefined and unnamed | |
1445 | in case it is local. */ | |
1446 | int bind = ELF_ST_BIND (*st_info); | |
1447 | int other = STV_DEFAULT; | |
1448 | if (bind == STB_LOCAL) | |
f8ad2513 | 1449 | { |
e9301e76 NC |
1450 | /* Make discarded local symbols unnamed and |
1451 | defined in the first prevailing section. */ | |
1452 | ELF_SET_FIELD (type_functions, ei_class, Sym, | |
1453 | ent, st_name, Elf_Word, 0); | |
1454 | ELF_SET_FIELD (type_functions, ei_class, Sym, | |
1455 | ent, st_shndx, Elf_Half, | |
1456 | sh_map[first_shndx]); | |
f8ad2513 NC |
1457 | } |
1458 | else | |
1459 | { | |
e9301e76 NC |
1460 | /* Make discarded global symbols hidden weak |
1461 | undefined and sharing the gnu_lto_ name. */ | |
1462 | bind = STB_WEAK; | |
1463 | other = STV_HIDDEN; | |
1464 | if (gnu_lto) | |
1465 | ELF_SET_FIELD (type_functions, ei_class, Sym, | |
1466 | ent, st_name, Elf_Word, | |
1467 | gnu_lto - strings); | |
f8ad2513 | 1468 | ELF_SET_FIELD (type_functions, ei_class, Sym, |
e9301e76 | 1469 | ent, st_shndx, Elf_Half, SHN_UNDEF); |
f8ad2513 | 1470 | } |
e9301e76 NC |
1471 | *st_other = other; |
1472 | *st_info = ELF_ST_INFO (bind, STT_NOTYPE); | |
1473 | ELF_SET_FIELD (type_functions, ei_class, Sym, | |
1474 | ent, st_value, Elf_Addr, 0); | |
1475 | ELF_SET_FIELD (type_functions, ei_class, Sym, | |
1476 | ent, st_size, Elf_Word, 0); | |
f8ad2513 | 1477 | } |
e9301e76 NC |
1478 | else if (raw_st_shndx < SHN_LORESERVE |
1479 | || raw_st_shndx == SHN_XINDEX) | |
1480 | /* Remap the section reference. */ | |
1481 | ELF_SET_FIELD (type_functions, ei_class, Sym, | |
1482 | ent, st_shndx, Elf_Half, sh_map[st_shndx]); | |
f8ad2513 | 1483 | } |
e9301e76 NC |
1484 | XDELETEVEC (strings); |
1485 | XDELETEVEC (shndx_table); | |
1486 | } | |
1487 | else if (sh_type == SHT_GROUP) | |
1488 | { | |
1489 | /* Remap section indices in groups and remove removed members. */ | |
1490 | unsigned char *ent, *dst; | |
1491 | for (dst = ent = buf + 4; ent < buf + length; ent += 4) | |
f8ad2513 | 1492 | { |
e9301e76 NC |
1493 | unsigned shndx = type_functions->fetch_Elf_Word (ent); |
1494 | if (pfnret[shndx - 1] == -1) | |
1495 | ; | |
1496 | else | |
1497 | { | |
1498 | type_functions->set_Elf_Word (dst, sh_map[shndx]); | |
1499 | dst += 4; | |
1500 | } | |
f8ad2513 | 1501 | } |
e9301e76 NC |
1502 | /* Adjust the length. */ |
1503 | length = dst - buf; | |
f8ad2513 | 1504 | } |
e9301e76 NC |
1505 | |
1506 | errmsg = simple_object_write_add_data (dobj, dest, | |
1507 | buf, length, 1, err); | |
1508 | XDELETEVEC (buf); | |
1509 | if (errmsg) | |
f8ad2513 | 1510 | { |
e9301e76 NC |
1511 | XDELETEVEC (names); |
1512 | XDELETEVEC (shdrs); | |
1513 | XDELETEVEC (symtab_indices_shndx); | |
1514 | return errmsg; | |
f8ad2513 NC |
1515 | } |
1516 | ||
1517 | flags = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1518 | shdr, sh_flags, Elf_Addr); | |
e9301e76 NC |
1519 | /* Remap the section references. */ |
1520 | { | |
1521 | unsigned int sh_info, sh_link; | |
1522 | if (flags & SHF_INFO_LINK || sh_type == SHT_REL || sh_type == SHT_RELA) | |
1523 | { | |
1524 | sh_info = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1525 | shdr, sh_info, Elf_Word); | |
1526 | if (sh_info < SHN_LORESERVE | |
1527 | || sh_info > SHN_HIRESERVE) | |
1528 | sh_info = sh_map[sh_info]; | |
1529 | ELF_SET_FIELD (type_functions, ei_class, Shdr, | |
1530 | shdr, sh_info, Elf_Word, sh_info); | |
1531 | } | |
1532 | sh_link = ELF_FETCH_FIELD (type_functions, ei_class, Shdr, | |
1533 | shdr, sh_link, Elf_Word); | |
1534 | if (sh_link < SHN_LORESERVE | |
1535 | || sh_link > SHN_HIRESERVE) | |
1536 | sh_link = sh_map[sh_link]; | |
1537 | ELF_SET_FIELD (type_functions, ei_class, Shdr, | |
1538 | shdr, sh_link, Elf_Word, sh_link); | |
1539 | } | |
1540 | /* The debugobj doesn't contain any code, thus no trampolines. | |
1541 | Even when the original object needs trampolines, debugobj | |
1542 | doesn't. */ | |
1543 | if (strcmp (name, ".note.GNU-stack") == 0) | |
1544 | flags &= ~SHF_EXECINSTR; | |
1545 | /* Clear SHF_EXCLUDE on to be preserved sections. */ | |
1546 | flags &= ~SHF_EXCLUDE; | |
f8ad2513 NC |
1547 | ELF_SET_FIELD (type_functions, ei_class, Shdr, |
1548 | shdr, sh_flags, Elf_Addr, flags); | |
1549 | } | |
1550 | ||
1551 | XDELETEVEC (names); | |
1552 | XDELETEVEC (shdrs); | |
1553 | XDELETEVEC (pfnret); | |
1554 | XDELETEVEC (pfnname); | |
e9301e76 NC |
1555 | XDELETEVEC (symtab_indices_shndx); |
1556 | XDELETEVEC (sh_map); | |
f8ad2513 NC |
1557 | |
1558 | return NULL; | |
1559 | } | |
1560 | ||
1561 | ||
ffa54e5c DD |
1562 | /* The ELF functions. */ |
1563 | ||
1564 | const struct simple_object_functions simple_object_elf_functions = | |
1565 | { | |
1566 | simple_object_elf_match, | |
1567 | simple_object_elf_find_sections, | |
1568 | simple_object_elf_fetch_attributes, | |
1569 | simple_object_elf_release_read, | |
f9e6589d | 1570 | simple_object_elf_attributes_merge, |
ffa54e5c DD |
1571 | simple_object_elf_release_attributes, |
1572 | simple_object_elf_start_write, | |
1573 | simple_object_elf_write_to_file, | |
f8ad2513 NC |
1574 | simple_object_elf_release_write, |
1575 | simple_object_elf_copy_lto_debug_sections | |
ffa54e5c | 1576 | }; |