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