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81187b54 KR |
1 | /* ELF executable support for BFD. |
2 | Copyright 1991, 1992, 1993 Free Software Foundation, Inc. | |
3 | ||
4 | Written by Fred Fish @ Cygnus Support, from information published | |
5 | in "UNIX System V Release 4, Programmers Guide: ANSI C and | |
6 | Programming Support Tools". Sufficient support for gdb. | |
7 | ||
8 | Rewritten by Mark Eichin @ Cygnus Support, from information | |
9 | published in "System V Application Binary Interface", chapters 4 | |
10 | and 5, as well as the various "Processor Supplement" documents | |
11 | derived from it. Added support for assembler and other object file | |
12 | utilities. | |
13 | ||
14 | This file is part of BFD, the Binary File Descriptor library. | |
15 | ||
16 | This program is free software; you can redistribute it and/or modify | |
17 | it under the terms of the GNU General Public License as published by | |
18 | the Free Software Foundation; either version 2 of the License, or | |
19 | (at your option) any later version. | |
20 | ||
21 | This program is distributed in the hope that it will be useful, | |
22 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24 | GNU General Public License for more details. | |
25 | ||
26 | You should have received a copy of the GNU General Public License | |
27 | along with this program; if not, write to the Free Software | |
28 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
29 | ||
30 | ||
31 | /**************************************** | |
32 | ||
33 | WARNING | |
34 | ||
35 | This is only a partial ELF implementation, | |
36 | incorporating only those parts that are | |
37 | required to get gdb up and running. It is | |
38 | expected that it will be expanded to a full | |
39 | ELF implementation at some future date. | |
40 | ||
41 | Unimplemented stubs call abort() to ensure | |
42 | that they get proper attention if they are | |
43 | ever called. The stubs are here since | |
44 | this version was hacked from the COFF | |
45 | version, and thus they will probably | |
46 | go away or get expanded appropriately in a | |
47 | future version. | |
48 | ||
49 | fnf@cygnus.com | |
50 | ||
51 | *****************************************/ | |
52 | ||
53 | ||
54 | /* Problems and other issues to resolve. | |
55 | ||
56 | (1) BFD expects there to be some fixed number of "sections" in | |
57 | the object file. I.E. there is a "section_count" variable in the | |
58 | bfd structure which contains the number of sections. However, ELF | |
59 | supports multiple "views" of a file. In particular, with current | |
60 | implementations, executable files typically have two tables, a | |
61 | program header table and a section header table, both of which | |
62 | partition the executable. | |
63 | ||
64 | In ELF-speak, the "linking view" of the file uses the section header | |
65 | table to access "sections" within the file, and the "execution view" | |
66 | uses the program header table to access "segments" within the file. | |
67 | "Segments" typically may contain all the data from one or more | |
68 | "sections". | |
69 | ||
70 | Note that the section header table is optional in ELF executables, | |
71 | but it is this information that is most useful to gdb. If the | |
72 | section header table is missing, then gdb should probably try | |
73 | to make do with the program header table. (FIXME) | |
74 | ||
75 | */ | |
76 | ||
77 | #include "bfd.h" | |
78 | #include "sysdep.h" | |
79 | #include "libbfd.h" | |
80 | #include "libelf.h" | |
81 | ||
82 | #ifdef HAVE_PROCFS /* Some core file support requires host /proc files */ | |
83 | #include <sys/procfs.h> | |
84 | #else | |
85 | #define bfd_prstatus(abfd, descdata, descsz, filepos) /* Define away */ | |
86 | #define bfd_fpregset(abfd, descdata, descsz, filepos) /* Define away */ | |
87 | #define bfd_prpsinfo(abfd, descdata, descsz, filepos) /* Define away */ | |
88 | #endif | |
89 | ||
90 | /* Forward declarations of static functions */ | |
91 | ||
92 | static char * | |
93 | elf_read PARAMS ((bfd *, long, int)); | |
94 | ||
95 | static struct sec * | |
96 | section_from_elf_index PARAMS ((bfd *, int)); | |
97 | ||
98 | static int | |
99 | elf_section_from_bfd_section PARAMS ((bfd *, struct sec *)); | |
100 | ||
101 | static boolean | |
102 | elf_slurp_symbol_table PARAMS ((bfd *, asymbol **)); | |
103 | ||
104 | static char * | |
105 | elf_get_str_section PARAMS ((bfd *, unsigned int)); | |
106 | ||
107 | /* Forward data declarations */ | |
108 | ||
109 | extern bfd_target elf_little_vec, elf_big_vec; | |
110 | ||
111 | /* Currently the elf_symbol_type struct just contains the generic bfd | |
112 | symbol structure. */ | |
113 | ||
114 | typedef struct | |
115 | { | |
116 | asymbol symbol; | |
117 | } elf_symbol_type; | |
118 | ||
119 | /* Some private data is stashed away for future use using the tdata pointer | |
120 | in the bfd structure. */ | |
121 | ||
122 | struct elf_obj_tdata | |
123 | { | |
124 | Elf_Internal_Ehdr elf_header[1]; /* Actual data, but ref like ptr */ | |
125 | Elf_Internal_Shdr *elf_sect_ptr; | |
126 | struct strtab *strtab_ptr; | |
127 | int symtab_section; | |
128 | void *prstatus; /* The raw /proc prstatus structure */ | |
129 | void *prpsinfo; /* The raw /proc prpsinfo structure */ | |
130 | }; | |
131 | ||
132 | #define elf_tdata(bfd) ((bfd) -> tdata.elf_obj_data) | |
133 | #define elf_elfheader(bfd) (elf_tdata(bfd) -> elf_header) | |
134 | #define elf_elfsections(bfd) (elf_tdata(bfd) -> elf_sect_ptr) | |
135 | #define elf_shstrtab(bfd) (elf_tdata(bfd) -> strtab_ptr) | |
136 | #define elf_onesymtab(bfd) (elf_tdata(bfd) -> symtab_section) | |
137 | #define core_prpsinfo(bfd) (elf_tdata(bfd) -> prpsinfo) | |
138 | #define core_prstatus(bfd) (elf_tdata(bfd) -> prstatus) | |
139 | ||
140 | /* Translate an ELF symbol in external format into an ELF symbol in internal | |
141 | format. */ | |
142 | ||
143 | static void | |
144 | DEFUN(elf_swap_symbol_in,(abfd, src, dst), | |
145 | bfd *abfd AND | |
146 | Elf_External_Sym *src AND | |
147 | Elf_Internal_Sym *dst) | |
148 | { | |
149 | dst -> st_name = bfd_h_get_32 (abfd, (bfd_byte *) src -> st_name); | |
150 | dst -> st_value = bfd_h_get_32 (abfd, (bfd_byte *) src -> st_value); | |
151 | dst -> st_size = bfd_h_get_32 (abfd, (bfd_byte *) src -> st_size); | |
152 | dst -> st_info = bfd_h_get_8 (abfd, (bfd_byte *) src -> st_info); | |
153 | dst -> st_other = bfd_h_get_8 (abfd, (bfd_byte *) src -> st_other); | |
154 | dst -> st_shndx = bfd_h_get_16 (abfd, (bfd_byte *) src -> st_shndx); | |
155 | } | |
156 | ||
157 | /* Translate an ELF symbol in internal format into an ELF symbol in external | |
158 | format. */ | |
159 | ||
160 | static void | |
161 | DEFUN(elf_swap_symbol_out,(abfd, src, dst), | |
162 | bfd *abfd AND | |
163 | Elf_Internal_Sym *src AND | |
164 | Elf_External_Sym *dst) | |
165 | { | |
166 | bfd_h_put_32 (abfd, src->st_name, dst->st_name); | |
167 | bfd_h_put_32 (abfd, src->st_value, dst->st_value); | |
168 | bfd_h_put_32 (abfd, src->st_size, dst->st_size); | |
169 | bfd_h_put_8 (abfd, src->st_info, dst->st_info); | |
170 | bfd_h_put_8 (abfd, src->st_other, dst->st_other); | |
171 | bfd_h_put_16 (abfd, src->st_shndx, dst->st_shndx); | |
172 | } | |
173 | ||
174 | ||
175 | /* Translate an ELF file header in external format into an ELF file header in | |
176 | internal format. */ | |
177 | ||
178 | static void | |
179 | DEFUN(elf_swap_ehdr_in,(abfd, src, dst), | |
180 | bfd *abfd AND | |
181 | Elf_External_Ehdr *src AND | |
182 | Elf_Internal_Ehdr *dst) | |
183 | { | |
184 | memcpy (dst -> e_ident, src -> e_ident, EI_NIDENT); | |
185 | dst -> e_type = bfd_h_get_16 (abfd, (bfd_byte *) src -> e_type); | |
186 | dst -> e_machine = bfd_h_get_16 (abfd, (bfd_byte *) src -> e_machine); | |
187 | dst -> e_version = bfd_h_get_32 (abfd, (bfd_byte *) src -> e_version); | |
188 | dst -> e_entry = bfd_h_get_32 (abfd, (bfd_byte *) src -> e_entry); | |
189 | dst -> e_phoff = bfd_h_get_32 (abfd, (bfd_byte *) src -> e_phoff); | |
190 | dst -> e_shoff = bfd_h_get_32 (abfd, (bfd_byte *) src -> e_shoff); | |
191 | dst -> e_flags = bfd_h_get_32 (abfd, (bfd_byte *) src -> e_flags); | |
192 | dst -> e_ehsize = bfd_h_get_16 (abfd, (bfd_byte *) src -> e_ehsize); | |
193 | dst -> e_phentsize = bfd_h_get_16 (abfd, (bfd_byte *) src -> e_phentsize); | |
194 | dst -> e_phnum = bfd_h_get_16 (abfd, (bfd_byte *) src -> e_phnum); | |
195 | dst -> e_shentsize = bfd_h_get_16 (abfd, (bfd_byte *) src -> e_shentsize); | |
196 | dst -> e_shnum = bfd_h_get_16 (abfd, (bfd_byte *) src -> e_shnum); | |
197 | dst -> e_shstrndx = bfd_h_get_16 (abfd, (bfd_byte *) src -> e_shstrndx); | |
198 | } | |
199 | ||
200 | /* Translate an ELF file header in internal format into an ELF file header in | |
201 | external format. */ | |
202 | ||
203 | static void | |
204 | DEFUN(elf_swap_ehdr_out,(abfd, src, dst), | |
205 | bfd *abfd AND | |
206 | Elf_Internal_Ehdr *src AND | |
207 | Elf_External_Ehdr *dst) | |
208 | { | |
209 | memcpy (dst -> e_ident, src -> e_ident, EI_NIDENT); | |
210 | /* note that all elements of dst are *arrays of unsigned char* already... */ | |
211 | bfd_h_put_16 (abfd, src->e_type, dst->e_type); | |
212 | bfd_h_put_16 (abfd, src->e_machine, dst->e_machine); | |
213 | bfd_h_put_32 (abfd, src->e_version, dst->e_version); | |
214 | bfd_h_put_32 (abfd, src->e_entry, dst->e_entry); | |
215 | bfd_h_put_32 (abfd, src->e_phoff, dst->e_phoff); | |
216 | bfd_h_put_32 (abfd, src->e_shoff, dst->e_shoff); | |
217 | bfd_h_put_32 (abfd, src->e_flags, dst->e_flags); | |
218 | bfd_h_put_16 (abfd, src->e_ehsize, dst->e_ehsize); | |
219 | bfd_h_put_16 (abfd, src->e_phentsize, dst->e_phentsize); | |
220 | bfd_h_put_16 (abfd, src->e_phnum, dst->e_phnum); | |
221 | bfd_h_put_16 (abfd, src->e_shentsize, dst->e_shentsize); | |
222 | bfd_h_put_16 (abfd, src->e_shnum, dst->e_shnum); | |
223 | bfd_h_put_16 (abfd, src->e_shstrndx, dst->e_shstrndx); | |
224 | } | |
225 | ||
226 | ||
227 | /* Translate an ELF section header table entry in external format into an | |
228 | ELF section header table entry in internal format. */ | |
229 | ||
230 | static void | |
231 | DEFUN(elf_swap_shdr_in,(abfd, src, dst), | |
232 | bfd *abfd AND | |
233 | Elf_External_Shdr *src AND | |
234 | Elf_Internal_Shdr *dst) | |
235 | { | |
236 | dst->sh_name = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_name); | |
237 | dst->sh_type = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_type); | |
238 | dst->sh_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_flags); | |
239 | dst->sh_addr = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_addr); | |
240 | dst->sh_offset = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_offset); | |
241 | dst->sh_size = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_size); | |
242 | dst->sh_link = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_link); | |
243 | dst->sh_info = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_info); | |
244 | dst->sh_addralign = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_addralign); | |
245 | dst->sh_entsize = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_entsize); | |
246 | /* we haven't done any processing on it yet, so... */ | |
247 | dst->rawdata = (void*)0; | |
248 | } | |
249 | ||
250 | /* Translate an ELF section header table entry in internal format into an | |
251 | ELF section header table entry in external format. */ | |
252 | ||
253 | static void | |
254 | DEFUN(elf_swap_shdr_out,(abfd, src, dst), | |
255 | bfd *abfd AND | |
256 | Elf_Internal_Shdr *src AND | |
257 | Elf_External_Shdr *dst) | |
258 | { | |
259 | /* note that all elements of dst are *arrays of unsigned char* already... */ | |
260 | bfd_h_put_32 (abfd, src->sh_name, dst->sh_name); | |
261 | bfd_h_put_32 (abfd, src->sh_type, dst->sh_type); | |
262 | bfd_h_put_32 (abfd, src->sh_flags, dst->sh_flags); | |
263 | bfd_h_put_32 (abfd, src->sh_addr, dst->sh_addr); | |
264 | bfd_h_put_32 (abfd, src->sh_offset, dst->sh_offset); | |
265 | bfd_h_put_32 (abfd, src->sh_size, dst->sh_size); | |
266 | bfd_h_put_32 (abfd, src->sh_link, dst->sh_link); | |
267 | bfd_h_put_32 (abfd, src->sh_info, dst->sh_info); | |
268 | bfd_h_put_32 (abfd, src->sh_addralign, dst->sh_addralign); | |
269 | bfd_h_put_32 (abfd, src->sh_entsize, dst->sh_entsize); | |
270 | } | |
271 | ||
272 | ||
273 | /* Translate an ELF program header table entry in external format into an | |
274 | ELF program header table entry in internal format. */ | |
275 | ||
276 | static void | |
277 | DEFUN(elf_swap_phdr_in,(abfd, src, dst), | |
278 | bfd *abfd AND | |
279 | Elf_External_Phdr *src AND | |
280 | Elf_Internal_Phdr *dst) | |
281 | { | |
282 | dst->p_type = bfd_h_get_32 (abfd, (bfd_byte *) src->p_type); | |
283 | dst->p_offset = bfd_h_get_32 (abfd, (bfd_byte *) src->p_offset); | |
284 | dst->p_vaddr = bfd_h_get_32 (abfd, (bfd_byte *) src->p_vaddr); | |
285 | dst->p_paddr = bfd_h_get_32 (abfd, (bfd_byte *) src->p_paddr); | |
286 | dst->p_filesz = bfd_h_get_32 (abfd, (bfd_byte *) src->p_filesz); | |
287 | dst->p_memsz = bfd_h_get_32 (abfd, (bfd_byte *) src->p_memsz); | |
288 | dst->p_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->p_flags); | |
289 | dst->p_align = bfd_h_get_32 (abfd, (bfd_byte *) src->p_align); | |
290 | } | |
291 | ||
292 | ||
293 | /* Translate an ELF reloc from external format to internal format. */ | |
294 | static void | |
295 | DEFUN(elf_swap_reloc_in,(abfd, src, dst), | |
296 | bfd *abfd AND | |
297 | Elf_External_Rel *src AND | |
298 | Elf_Internal_Rel *dst) | |
299 | { | |
300 | dst->r_offset = bfd_h_get_32 (abfd, (bfd_byte *) src->r_offset); | |
301 | dst->r_info = bfd_h_get_32 (abfd, (bfd_byte *) src->r_info); | |
302 | } | |
303 | ||
304 | static void | |
305 | DEFUN(elf_swap_reloca_in,(abfd, src, dst), | |
306 | bfd *abfd AND | |
307 | Elf_External_Rela *src AND | |
308 | Elf_Internal_Rela *dst) | |
309 | { | |
310 | dst->r_offset = bfd_h_get_32 (abfd, (bfd_byte *) src->r_offset); | |
311 | dst->r_info = bfd_h_get_32 (abfd, (bfd_byte *) src->r_info); | |
312 | dst->r_addend = bfd_h_get_32 (abfd, (bfd_byte *) src->r_addend); | |
313 | } | |
314 | ||
315 | /* Translate an ELF reloc from internal format to external format. */ | |
316 | static void | |
317 | DEFUN(elf_swap_reloc_out,(abfd, src, dst), | |
318 | bfd *abfd AND | |
319 | Elf_Internal_Rel *src AND | |
320 | Elf_External_Rel *dst) | |
321 | { | |
322 | bfd_h_put_32 (abfd, src->r_offset, dst->r_offset); | |
323 | bfd_h_put_32 (abfd, src->r_info, dst->r_info); | |
324 | } | |
325 | ||
326 | static void | |
327 | DEFUN(elf_swap_reloca_out,(abfd, src, dst), | |
328 | bfd *abfd AND | |
329 | Elf_Internal_Rela *src AND | |
330 | Elf_External_Rela *dst) | |
331 | { | |
332 | bfd_h_put_32 (abfd, src->r_offset, dst->r_offset); | |
333 | bfd_h_put_32 (abfd, src->r_info, dst->r_info); | |
334 | bfd_h_put_32 (abfd, src->r_addend, dst->r_addend); | |
335 | } | |
336 | ||
337 | /* | |
338 | INTERNAL_FUNCTION | |
339 | bfd_elf_find_section | |
340 | ||
341 | SYNOPSIS | |
342 | struct elf_internal_shdr *bfd_elf_find_section (bfd *abfd, char *name); | |
343 | ||
344 | DESCRIPTION | |
345 | Helper functions for GDB to locate the string tables. | |
346 | Since BFD hides string tables from callers, GDB needs to use an | |
347 | internal hook to find them. Sun's .stabstr, in particular, | |
348 | isn't even pointed to by the .stab section, so ordinary | |
349 | mechanisms wouldn't work to find it, even if we had some. | |
350 | */ | |
351 | ||
352 | struct elf_internal_shdr * | |
353 | DEFUN(bfd_elf_find_section, (abfd, name), | |
354 | bfd *abfd AND | |
355 | char *name) | |
356 | { | |
357 | Elf_Internal_Shdr *i_shdrp; | |
358 | Elf_Internal_Shdr *gotit = NULL; | |
359 | char *shstrtab; | |
360 | unsigned int max; | |
361 | unsigned int i; | |
362 | ||
363 | i_shdrp = elf_elfsections (abfd); | |
364 | if (i_shdrp != NULL) | |
365 | { | |
366 | shstrtab = elf_get_str_section (abfd, elf_elfheader (abfd)->e_shstrndx); | |
367 | if (shstrtab != NULL) | |
368 | { | |
369 | max = elf_elfheader (abfd)->e_shnum; | |
370 | for (i = 1; i < max; i++) | |
371 | { | |
372 | if (!strcmp (&shstrtab[i_shdrp[i].sh_name], name)) | |
373 | { | |
374 | gotit = &i_shdrp[i]; | |
375 | } | |
376 | } | |
377 | } | |
378 | } | |
379 | return (gotit); | |
380 | } | |
381 | ||
382 | /* End of GDB support. */ | |
383 | ||
384 | static char * | |
385 | DEFUN(elf_get_str_section, (abfd, shindex), | |
386 | bfd *abfd AND | |
387 | unsigned int shindex) | |
388 | { | |
389 | Elf_Internal_Shdr *i_shdrp; | |
390 | char *shstrtab = NULL; | |
391 | unsigned int offset; | |
392 | unsigned int shstrtabsize; | |
393 | ||
394 | i_shdrp = elf_elfsections (abfd); | |
395 | if (i_shdrp != NULL) | |
396 | { | |
397 | shstrtab = i_shdrp[shindex].rawdata; | |
398 | if (shstrtab == NULL) | |
399 | { | |
400 | /* No cached one, attempt to read, and cache what we read. */ | |
401 | offset = i_shdrp[shindex].sh_offset; | |
402 | shstrtabsize = i_shdrp[shindex].sh_size; | |
403 | shstrtab = elf_read (abfd, offset, shstrtabsize); | |
404 | i_shdrp[shindex].rawdata = (void*) shstrtab; | |
405 | } | |
406 | } | |
407 | return (shstrtab); | |
408 | } | |
409 | ||
410 | static char * | |
411 | DEFUN(elf_string_from_elf_section, (abfd, shindex, strindex), | |
412 | bfd *abfd AND | |
413 | unsigned int shindex AND | |
414 | unsigned int strindex) | |
415 | { | |
416 | Elf_Internal_Shdr *i_shdrp = elf_elfsections (abfd); | |
417 | Elf_Internal_Shdr *hdr = i_shdrp + shindex; | |
418 | ||
419 | if (! hdr->rawdata) | |
420 | { | |
421 | if (elf_get_str_section (abfd, shindex) == NULL) | |
422 | { | |
423 | return NULL; | |
424 | } | |
425 | } | |
426 | return ((char*)hdr->rawdata)+strindex; | |
427 | } | |
428 | ||
429 | #define elf_string_from_elf_strtab(abfd, strindex) \ | |
430 | elf_string_from_elf_section (abfd, elf_elfheader(abfd)->e_shstrndx, strindex) | |
431 | ||
432 | /* Create a new bfd section from an ELF section header. */ | |
433 | ||
434 | static boolean | |
435 | DEFUN(bfd_section_from_shdr, (abfd, shindex), | |
436 | bfd *abfd AND | |
437 | unsigned int shindex) | |
438 | { | |
439 | Elf_Internal_Shdr *i_shdrp = elf_elfsections (abfd); | |
440 | Elf_Internal_Shdr *hdr = i_shdrp + shindex; | |
441 | asection *newsect; | |
442 | char *name; | |
443 | ||
444 | name = hdr->sh_name ? | |
445 | elf_string_from_elf_strtab (abfd, hdr->sh_name) : "unnamed"; | |
446 | ||
447 | switch(hdr->sh_type) { | |
448 | ||
449 | case SHT_NULL: | |
450 | /* inactive section. Throw it away. */ | |
451 | return true; | |
452 | ||
453 | case SHT_PROGBITS: | |
454 | case SHT_NOBITS: | |
455 | /* Bits that get saved. This one is real. */ | |
456 | if (! hdr->rawdata ) | |
457 | { | |
458 | newsect = bfd_make_section (abfd, name); | |
459 | newsect->vma = hdr->sh_addr; | |
460 | newsect->_raw_size = hdr->sh_size; | |
461 | newsect->filepos = hdr->sh_offset; /* so we can read back the bits */ | |
462 | newsect->flags |= SEC_HAS_CONTENTS; | |
463 | ||
464 | if (hdr->sh_flags & SHF_ALLOC) | |
465 | { | |
466 | newsect->flags |= SEC_ALLOC; | |
467 | if (hdr->sh_type != SHT_NOBITS) | |
468 | newsect->flags |= SEC_LOAD; | |
469 | } | |
470 | ||
471 | if (!(hdr->sh_flags & SHF_WRITE)) | |
472 | newsect->flags |= SEC_READONLY; | |
473 | ||
474 | if (hdr->sh_flags & SHF_EXECINSTR) | |
475 | newsect->flags |= SEC_CODE; /* FIXME: may only contain SOME code */ | |
476 | else | |
477 | newsect->flags |= SEC_DATA; | |
478 | ||
479 | hdr->rawdata = (void*)newsect; | |
480 | } | |
481 | return true; | |
482 | break; | |
483 | ||
484 | case SHT_SYMTAB: /* A symbol table */ | |
485 | BFD_ASSERT (hdr->sh_entsize == sizeof (Elf_External_Sym)); | |
486 | elf_onesymtab (abfd) = shindex; | |
487 | abfd->flags |= HAS_SYMS; | |
488 | return true; | |
489 | ||
490 | case SHT_STRTAB: /* A string table */ | |
491 | return true; | |
492 | ||
493 | case SHT_REL: | |
494 | case SHT_RELA: | |
495 | /* *these* do a lot of work -- but build no sections! */ | |
496 | /* the spec says there can be multiple strtabs, but only one symtab */ | |
497 | /* but there can be lots of REL* sections. */ | |
498 | /* FIXME: The above statement is wrong! There are typically at least | |
499 | two symbol tables in a dynamically linked executable, ".dynsym" | |
500 | which is the dynamic linkage symbol table and ".symtab", which is | |
501 | the "traditional" symbol table. -fnf */ | |
502 | ||
503 | { | |
504 | asection *target_sect; | |
505 | ||
506 | bfd_section_from_shdr (abfd, hdr->sh_link); /* symbol table */ | |
507 | bfd_section_from_shdr (abfd, hdr->sh_info); /* target */ | |
508 | target_sect = section_from_elf_index (abfd, hdr->sh_info); | |
509 | if (target_sect == NULL) | |
510 | return false; | |
511 | ||
512 | #if 0 | |
513 | /* FIXME: We are only prepared to read one symbol table, so | |
514 | do NOT read the dynamic symbol table since it is only a | |
515 | subset of the full symbol table. Also see comment above. -fnf */ | |
516 | if (!elf_slurp_symbol_table(abfd, i_shdrp + hdr->sh_link)) | |
517 | return false; | |
518 | #endif | |
519 | ||
520 | target_sect->reloc_count = hdr->sh_size / hdr->sh_entsize; | |
521 | target_sect->flags |= SEC_RELOC; | |
522 | target_sect->relocation = 0; | |
523 | target_sect->rel_filepos = hdr->sh_offset; | |
524 | return true; | |
525 | } | |
526 | break; | |
527 | ||
528 | case SHT_HASH: | |
529 | case SHT_DYNAMIC: | |
530 | case SHT_DYNSYM: /* could treat this like symtab... */ | |
531 | #if 0 | |
532 | fprintf(stderr, "Dynamic Linking sections not yet supported.\n"); | |
533 | abort (); | |
534 | #endif | |
535 | break; | |
536 | ||
537 | case SHT_NOTE: | |
538 | #if 0 | |
539 | fprintf(stderr, "Note Sections not yet supported.\n"); | |
540 | abort (); | |
541 | #endif | |
542 | break; | |
543 | ||
544 | case SHT_SHLIB: | |
545 | #if 0 | |
546 | fprintf(stderr, "SHLIB Sections not supported (and non conforming.)\n"); | |
547 | #endif | |
548 | return true; | |
549 | ||
550 | default: | |
551 | break; | |
552 | } | |
553 | ||
554 | return (true); | |
555 | } | |
556 | ||
557 | ||
558 | ||
559 | ||
560 | struct strtab { | |
561 | char *tab; | |
562 | int nentries; | |
563 | int length; | |
564 | }; | |
565 | ||
566 | ||
567 | static struct strtab * | |
568 | DEFUN(bfd_new_strtab, (abfd), | |
569 | bfd *abfd) | |
570 | { | |
571 | struct strtab *ss; | |
572 | ||
573 | ss = (struct strtab *) bfd_xmalloc(sizeof(struct strtab)); | |
574 | ss->tab = bfd_xmalloc(1); | |
575 | BFD_ASSERT(ss->tab != 0); | |
576 | *ss->tab = 0; | |
577 | ss->nentries = 0; | |
578 | ss->length = 1; | |
579 | ||
580 | return ss; | |
581 | } | |
582 | ||
583 | static int | |
584 | DEFUN(bfd_add_to_strtab, (abfd, ss, str), | |
585 | bfd *abfd AND | |
586 | struct strtab *ss AND | |
587 | CONST char *str) | |
588 | { | |
589 | /* should search first, but for now: */ | |
590 | /* include the trailing NUL */ | |
591 | int ln = strlen(str)+1; | |
592 | ||
593 | /* should this be using obstacks? */ | |
594 | ss->tab = realloc(ss->tab, ss->length + ln); | |
595 | ||
596 | BFD_ASSERT(ss->tab != 0); | |
597 | strcpy(ss->tab + ss->length, str); | |
598 | ss->nentries++; | |
599 | ss->length += ln; | |
600 | ||
601 | return ss->length - ln; | |
602 | } | |
603 | ||
604 | static int | |
605 | DEFUN(bfd_add_2_to_strtab, (abfd, ss, str, str2), | |
606 | bfd *abfd AND | |
607 | struct strtab *ss AND | |
608 | char *str AND | |
609 | CONST char *str2) | |
610 | { | |
611 | /* should search first, but for now: */ | |
612 | /* include the trailing NUL */ | |
613 | int ln = strlen(str)+strlen(str2)+1; | |
614 | ||
615 | /* should this be using obstacks? */ | |
616 | if (ss->length) | |
617 | ss->tab = realloc(ss->tab, ss->length + ln); | |
618 | else | |
619 | ss->tab = bfd_xmalloc(ln); | |
620 | ||
621 | BFD_ASSERT(ss->tab != 0); | |
622 | strcpy(ss->tab + ss->length, str); | |
623 | strcpy(ss->tab + ss->length + strlen(str), str2); | |
624 | ss->nentries++; | |
625 | ss->length += ln; | |
626 | ||
627 | return ss->length - ln; | |
628 | } | |
629 | ||
630 | /* Create a new ELF section from a bfd section. */ | |
631 | ||
632 | static boolean | |
633 | DEFUN(bfd_shdr_from_section, (abfd, hdr, shstrtab, indx), | |
634 | bfd *abfd AND | |
635 | Elf_Internal_Shdr *hdr AND | |
636 | struct strtab *shstrtab AND | |
637 | int indx) | |
638 | { | |
639 | asection *sect; | |
640 | int ndx; | |
641 | ||
642 | /* figure out out to write the section name from the bfd section name. MWE */ | |
643 | ||
644 | sect = abfd->sections; | |
645 | for (ndx = indx; --ndx; ) | |
646 | { | |
647 | sect = sect->next; | |
648 | } | |
649 | hdr[indx].sh_name = bfd_add_to_strtab(abfd, shstrtab, | |
650 | bfd_section_name(abfd, sect)); | |
651 | hdr[indx].sh_addr = sect->vma; | |
652 | hdr[indx].sh_size = sect->_raw_size; | |
653 | hdr[indx].sh_flags = 0; | |
654 | /* these need to be preserved on */ | |
655 | hdr[indx].sh_link = 0; | |
656 | hdr[indx].sh_info = 0; | |
657 | hdr[indx].sh_addralign = 0; | |
658 | hdr[indx].sh_entsize = 0; | |
659 | ||
660 | hdr[indx].sh_type = 0; | |
661 | if (sect->flags & SEC_RELOC) { | |
662 | hdr[indx].sh_type = SHT_RELA; /* FIXME -- sparc specific */ | |
663 | } | |
664 | ||
665 | if (sect->flags & SEC_HAS_CONTENTS) | |
666 | { | |
667 | hdr[indx].sh_offset = sect->filepos; | |
668 | hdr[indx].sh_size = sect->_raw_size; | |
669 | } | |
670 | if (sect->flags & SEC_ALLOC) | |
671 | { | |
672 | hdr[indx].sh_flags |= SHF_ALLOC; | |
673 | if (sect->flags & SEC_LOAD) | |
674 | { | |
675 | /* do something with sh_type ? */ | |
676 | } | |
677 | } | |
678 | if (!(sect->flags & SEC_READONLY)) | |
679 | hdr[indx].sh_flags |= SHF_WRITE; | |
680 | ||
681 | if (sect->flags & SEC_CODE) | |
682 | hdr[indx].sh_flags |= SHF_EXECINSTR; | |
683 | ||
684 | return (true); | |
685 | } | |
686 | ||
687 | /* Create a new bfd section from an ELF program header. | |
688 | ||
689 | Since program segments have no names, we generate a synthetic name | |
690 | of the form segment<NUM>, where NUM is generally the index in the | |
691 | program header table. For segments that are split (see below) we | |
692 | generate the names segment<NUM>a and segment<NUM>b. | |
693 | ||
694 | Note that some program segments may have a file size that is different than | |
695 | (less than) the memory size. All this means is that at execution the | |
696 | system must allocate the amount of memory specified by the memory size, | |
697 | but only initialize it with the first "file size" bytes read from the | |
698 | file. This would occur for example, with program segments consisting | |
699 | of combined data+bss. | |
700 | ||
701 | To handle the above situation, this routine generates TWO bfd sections | |
702 | for the single program segment. The first has the length specified by | |
703 | the file size of the segment, and the second has the length specified | |
704 | by the difference between the two sizes. In effect, the segment is split | |
705 | into it's initialized and uninitialized parts. | |
706 | ||
707 | */ | |
708 | ||
709 | static boolean | |
710 | DEFUN(bfd_section_from_phdr, (abfd, hdr, index), | |
711 | bfd *abfd AND | |
712 | Elf_Internal_Phdr *hdr AND | |
713 | int index) | |
714 | { | |
715 | asection *newsect; | |
716 | char *name; | |
717 | char namebuf[64]; | |
718 | int split; | |
719 | ||
720 | split = ((hdr -> p_memsz > 0) && | |
721 | (hdr -> p_filesz > 0) && | |
722 | (hdr -> p_memsz > hdr -> p_filesz)); | |
723 | sprintf (namebuf, split ? "segment%da" : "segment%d", index); | |
724 | name = bfd_alloc (abfd, strlen (namebuf) + 1); | |
725 | strcpy (name, namebuf); | |
726 | newsect = bfd_make_section (abfd, name); | |
727 | newsect -> vma = hdr -> p_vaddr; | |
728 | newsect -> _raw_size = hdr -> p_filesz; | |
729 | newsect -> filepos = hdr -> p_offset; | |
730 | newsect -> flags |= SEC_HAS_CONTENTS; | |
731 | if (hdr -> p_type == PT_LOAD) | |
732 | { | |
733 | newsect -> flags |= SEC_ALLOC; | |
734 | newsect -> flags |= SEC_LOAD; | |
735 | if (hdr -> p_flags & PF_X) | |
736 | { | |
737 | /* FIXME: all we known is that it has execute PERMISSION, | |
738 | may be data. */ | |
739 | newsect -> flags |= SEC_CODE; | |
740 | } | |
741 | } | |
742 | if (!(hdr -> p_flags & PF_W)) | |
743 | { | |
744 | newsect -> flags |= SEC_READONLY; | |
745 | } | |
746 | ||
747 | if (split) | |
748 | { | |
749 | sprintf (namebuf, "segment%db", index); | |
750 | name = bfd_alloc (abfd, strlen (namebuf) + 1); | |
751 | strcpy (name, namebuf); | |
752 | newsect = bfd_make_section (abfd, name); | |
753 | newsect -> vma = hdr -> p_vaddr + hdr -> p_filesz; | |
754 | newsect -> _raw_size = hdr -> p_memsz - hdr -> p_filesz; | |
755 | if (hdr -> p_type == PT_LOAD) | |
756 | { | |
757 | newsect -> flags |= SEC_ALLOC; | |
758 | if (hdr -> p_flags & PF_X) | |
759 | newsect -> flags |= SEC_CODE; | |
760 | } | |
761 | if (!(hdr -> p_flags & PF_W)) | |
762 | newsect -> flags |= SEC_READONLY; | |
763 | } | |
764 | ||
765 | return (true); | |
766 | } | |
767 | ||
768 | #ifdef HAVE_PROCFS | |
769 | ||
770 | static void | |
771 | DEFUN(bfd_prstatus,(abfd, descdata, descsz, filepos), | |
772 | bfd *abfd AND | |
773 | char *descdata AND | |
774 | int descsz AND | |
775 | long filepos) | |
776 | { | |
777 | asection *newsect; | |
778 | prstatus_t *status = (prstatus_t *)0; | |
779 | ||
780 | if (descsz == sizeof (prstatus_t)) | |
781 | { | |
782 | newsect = bfd_make_section (abfd, ".reg"); | |
783 | newsect -> _raw_size = sizeof (status->pr_reg); | |
784 | newsect -> filepos = filepos + (long) &status->pr_reg; | |
785 | newsect -> flags = SEC_ALLOC | SEC_HAS_CONTENTS; | |
786 | newsect -> alignment_power = 2; | |
787 | if ((core_prstatus (abfd) = bfd_alloc (abfd, descsz)) != NULL) | |
788 | { | |
789 | memcpy (core_prstatus (abfd), descdata, descsz); | |
790 | } | |
791 | } | |
792 | } | |
793 | ||
794 | /* Stash a copy of the prpsinfo structure away for future use. */ | |
795 | ||
796 | static void | |
797 | DEFUN(bfd_prpsinfo,(abfd, descdata, descsz, filepos), | |
798 | bfd *abfd AND | |
799 | char *descdata AND | |
800 | int descsz AND | |
801 | long filepos) | |
802 | { | |
803 | asection *newsect; | |
804 | ||
805 | if (descsz == sizeof (prpsinfo_t)) | |
806 | { | |
807 | if ((core_prpsinfo (abfd) = bfd_alloc (abfd, descsz)) != NULL) | |
808 | { | |
809 | memcpy (core_prpsinfo (abfd), descdata, descsz); | |
810 | } | |
811 | } | |
812 | } | |
813 | ||
814 | static void | |
815 | DEFUN(bfd_fpregset,(abfd, descdata, descsz, filepos), | |
816 | bfd *abfd AND | |
817 | char *descdata AND | |
818 | int descsz AND | |
819 | long filepos) | |
820 | { | |
821 | asection *newsect; | |
822 | ||
823 | newsect = bfd_make_section (abfd, ".reg2"); | |
824 | newsect -> _raw_size = descsz; | |
825 | newsect -> filepos = filepos; | |
826 | newsect -> flags = SEC_ALLOC | SEC_HAS_CONTENTS; | |
827 | newsect -> alignment_power = 2; | |
828 | } | |
829 | ||
830 | #endif /* HAVE_PROCFS */ | |
831 | ||
832 | /* Return a pointer to the args (including the command name) that were | |
833 | seen by the program that generated the core dump. Note that for | |
834 | some reason, a spurious space is tacked onto the end of the args | |
835 | in some (at least one anyway) implementations, so strip it off if | |
836 | it exists. */ | |
837 | ||
838 | char * | |
839 | DEFUN(elf_core_file_failing_command, (abfd), | |
840 | bfd *abfd) | |
841 | { | |
842 | #ifdef HAVE_PROCFS | |
843 | if (core_prpsinfo (abfd)) | |
844 | { | |
845 | prpsinfo_t *p = core_prpsinfo (abfd); | |
846 | char *scan = p -> pr_psargs; | |
847 | while (*scan++) {;} | |
848 | scan -= 2; | |
849 | if ((scan > p -> pr_psargs) && (*scan == ' ')) | |
850 | { | |
851 | *scan = '\000'; | |
852 | } | |
853 | return (p -> pr_psargs); | |
854 | } | |
855 | #endif | |
856 | return (NULL); | |
857 | } | |
858 | ||
859 | /* Return the number of the signal that caused the core dump. Presumably, | |
860 | since we have a core file, we got a signal of some kind, so don't bother | |
861 | checking the other process status fields, just return the signal number. | |
862 | */ | |
863 | ||
864 | int | |
865 | DEFUN(elf_core_file_failing_signal, (abfd), | |
866 | bfd *abfd) | |
867 | { | |
868 | #ifdef HAVE_PROCFS | |
869 | if (core_prstatus (abfd)) | |
870 | { | |
871 | return (((prstatus_t *)(core_prstatus (abfd))) -> pr_cursig); | |
872 | } | |
873 | #endif | |
874 | return (-1); | |
875 | } | |
876 | ||
877 | /* Check to see if the core file could reasonably be expected to have | |
878 | come for the current executable file. Note that by default we return | |
879 | true unless we find something that indicates that there might be a | |
880 | problem. | |
881 | */ | |
882 | ||
883 | boolean | |
884 | DEFUN(elf_core_file_matches_executable_p, (core_bfd, exec_bfd), | |
885 | bfd *core_bfd AND | |
886 | bfd *exec_bfd) | |
887 | { | |
888 | #ifdef HAVE_PROCFS | |
889 | char *corename; | |
890 | char *execname; | |
891 | #endif | |
892 | ||
893 | /* First, xvecs must match since both are ELF files for the same target. */ | |
894 | ||
895 | if (core_bfd->xvec != exec_bfd->xvec) | |
896 | { | |
897 | bfd_error = system_call_error; | |
898 | return (false); | |
899 | } | |
900 | ||
901 | #ifdef HAVE_PROCFS | |
902 | ||
903 | /* If no prpsinfo, just return true. Otherwise, grab the last component | |
904 | of the exec'd pathname from the prpsinfo. */ | |
905 | ||
906 | if (core_prpsinfo (core_bfd)) | |
907 | { | |
908 | corename = (((struct prpsinfo *) core_prpsinfo (core_bfd)) -> pr_fname); | |
909 | } | |
910 | else | |
911 | { | |
912 | return (true); | |
913 | } | |
914 | ||
915 | /* Find the last component of the executable pathname. */ | |
916 | ||
917 | if ((execname = strrchr (exec_bfd -> filename, '/')) != NULL) | |
918 | { | |
919 | execname++; | |
920 | } | |
921 | else | |
922 | { | |
923 | execname = (char *) exec_bfd -> filename; | |
924 | } | |
925 | ||
926 | /* See if they match */ | |
927 | ||
928 | return (strcmp (execname, corename) ? false : true); | |
929 | ||
930 | #else | |
931 | ||
932 | return (true); | |
933 | ||
934 | #endif /* HAVE_PROCFS */ | |
935 | } | |
936 | ||
937 | /* ELF core files contain a segment of type PT_NOTE, that holds much of | |
938 | the information that would normally be available from the /proc interface | |
939 | for the process, at the time the process dumped core. Currently this | |
940 | includes copies of the prstatus, prpsinfo, and fpregset structures. | |
941 | ||
942 | Since these structures are potentially machine dependent in size and | |
943 | ordering, bfd provides two levels of support for them. The first level, | |
944 | available on all machines since it does not require that the host | |
945 | have /proc support or the relevant include files, is to create a bfd | |
946 | section for each of the prstatus, prpsinfo, and fpregset structures, | |
947 | without any interpretation of their contents. With just this support, | |
948 | the bfd client will have to interpret the structures itself. Even with | |
949 | /proc support, it might want these full structures for it's own reasons. | |
950 | ||
951 | In the second level of support, where HAVE_PROCFS is defined, bfd will | |
952 | pick apart the structures to gather some additional information that | |
953 | clients may want, such as the general register set, the name of the | |
954 | exec'ed file and its arguments, the signal (if any) that caused the | |
955 | core dump, etc. | |
956 | ||
957 | */ | |
958 | ||
959 | static boolean | |
960 | DEFUN(elf_corefile_note, (abfd, hdr), | |
961 | bfd *abfd AND | |
962 | Elf_Internal_Phdr *hdr) | |
963 | { | |
964 | Elf_External_Note *x_note_p; /* Elf note, external form */ | |
965 | Elf_Internal_Note i_note; /* Elf note, internal form */ | |
966 | char *buf = NULL; /* Entire note segment contents */ | |
967 | char *namedata; /* Name portion of the note */ | |
968 | char *descdata; /* Descriptor portion of the note */ | |
969 | char *sectname; /* Name to use for new section */ | |
970 | long filepos; /* File offset to descriptor data */ | |
971 | asection *newsect; | |
972 | ||
973 | if (hdr -> p_filesz > 0 | |
974 | && (buf = (char *) bfd_xmalloc (hdr -> p_filesz)) != NULL | |
975 | && bfd_seek (abfd, hdr -> p_offset, SEEK_SET) != -1 | |
976 | && bfd_read ((PTR) buf, hdr -> p_filesz, 1, abfd) == hdr -> p_filesz) | |
977 | { | |
978 | x_note_p = (Elf_External_Note *) buf; | |
979 | while ((char *) x_note_p < (buf + hdr -> p_filesz)) | |
980 | { | |
981 | i_note.namesz = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p -> namesz); | |
982 | i_note.descsz = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p -> descsz); | |
983 | i_note.type = bfd_h_get_32 (abfd, (bfd_byte *) x_note_p -> type); | |
984 | namedata = x_note_p -> name; | |
985 | descdata = namedata + BFD_ALIGN (i_note.namesz, 4); | |
986 | filepos = hdr -> p_offset + (descdata - buf); | |
987 | switch (i_note.type) { | |
988 | case NT_PRSTATUS: | |
989 | /* process descdata as prstatus info */ | |
990 | bfd_prstatus (abfd, descdata, i_note.descsz, filepos); | |
991 | sectname = ".prstatus"; | |
992 | break; | |
993 | case NT_FPREGSET: | |
994 | /* process descdata as fpregset info */ | |
995 | bfd_fpregset (abfd, descdata, i_note.descsz, filepos); | |
996 | sectname = ".fpregset"; | |
997 | break; | |
998 | case NT_PRPSINFO: | |
999 | /* process descdata as prpsinfo */ | |
1000 | bfd_prpsinfo (abfd, descdata, i_note.descsz, filepos); | |
1001 | sectname = ".prpsinfo"; | |
1002 | break; | |
1003 | default: | |
1004 | /* Unknown descriptor, just ignore it. */ | |
1005 | sectname = NULL; | |
1006 | break; | |
1007 | } | |
1008 | if (sectname != NULL) | |
1009 | { | |
1010 | newsect = bfd_make_section (abfd, sectname); | |
1011 | newsect -> _raw_size = i_note.descsz; | |
1012 | newsect -> filepos = filepos; | |
1013 | newsect -> flags = SEC_ALLOC | SEC_HAS_CONTENTS; | |
1014 | newsect -> alignment_power = 2; | |
1015 | } | |
1016 | x_note_p = (Elf_External_Note *) | |
1017 | (descdata + BFD_ALIGN (i_note.descsz, 4)); | |
1018 | } | |
1019 | } | |
1020 | if (buf != NULL) | |
1021 | { | |
1022 | free (buf); | |
1023 | } | |
1024 | return true; | |
1025 | ||
1026 | } | |
1027 | ||
1028 | ||
1029 | /* Read a specified number of bytes at a specified offset in an ELF | |
1030 | file, into a newly allocated buffer, and return a pointer to the | |
1031 | buffer. */ | |
1032 | ||
1033 | static char * | |
1034 | DEFUN(elf_read, (abfd, offset, size), | |
1035 | bfd *abfd AND | |
1036 | long offset AND | |
1037 | int size) | |
1038 | { | |
1039 | char *buf; | |
1040 | ||
1041 | if ((buf = bfd_alloc (abfd, size)) == NULL) | |
1042 | { | |
1043 | bfd_error = no_memory; | |
1044 | return (NULL); | |
1045 | } | |
1046 | if (bfd_seek (abfd, offset, SEEK_SET) == -1) | |
1047 | { | |
1048 | bfd_error = system_call_error; | |
1049 | return (NULL); | |
1050 | } | |
1051 | if (bfd_read ((PTR) buf, size, 1, abfd) != size) | |
1052 | { | |
1053 | bfd_error = system_call_error; | |
1054 | return (NULL); | |
1055 | } | |
1056 | return (buf); | |
1057 | } | |
1058 | ||
1059 | /* Begin processing a given object. | |
1060 | ||
1061 | First we validate the file by reading in the ELF header and checking | |
1062 | the magic number. | |
1063 | ||
1064 | */ | |
1065 | ||
1066 | bfd_target * | |
1067 | DEFUN (elf_object_p, (abfd), bfd *abfd) | |
1068 | { | |
1069 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ | |
1070 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ | |
1071 | Elf_External_Shdr x_shdr; /* Section header table entry, external form */ | |
1072 | Elf_Internal_Shdr *i_shdrp; /* Section header table, internal form */ | |
1073 | int shindex; | |
1074 | char *shstrtab; /* Internal copy of section header stringtab */ | |
1075 | ||
1076 | /* Read in the ELF header in external format. */ | |
1077 | ||
1078 | if (bfd_read ((PTR) &x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr)) | |
1079 | { | |
1080 | bfd_error = system_call_error; | |
1081 | return (NULL); | |
1082 | } | |
1083 | ||
1084 | /* Now check to see if we have a valid ELF file, and one that BFD can | |
1085 | make use of. The magic number must match, the address size ('class') | |
1086 | and byte-swapping must match our XVEC entry, and it must have a | |
1087 | section header table (FIXME: See comments re sections at top of this | |
1088 | file). */ | |
1089 | ||
1090 | if (x_ehdr.e_ident[EI_MAG0] != ELFMAG0 || | |
1091 | x_ehdr.e_ident[EI_MAG1] != ELFMAG1 || | |
1092 | x_ehdr.e_ident[EI_MAG2] != ELFMAG2 || | |
1093 | x_ehdr.e_ident[EI_MAG3] != ELFMAG3) | |
1094 | { | |
1095 | wrong: | |
1096 | bfd_error = wrong_format; | |
1097 | return (NULL); | |
1098 | } | |
1099 | ||
1100 | /* FIXME, Check EI_VERSION here ! */ | |
1101 | ||
1102 | switch (x_ehdr.e_ident[EI_CLASS]) | |
1103 | { | |
1104 | case ELFCLASSNONE: /* address size not specified */ | |
1105 | goto wrong; /* No support if can't tell address size */ | |
1106 | case ELFCLASS32: /* 32-bit addresses */ | |
1107 | break; | |
1108 | case ELFCLASS64: /* 64-bit addresses */ | |
1109 | goto wrong; /* FIXME: 64 bits not yet supported */ | |
1110 | default: | |
1111 | goto wrong; /* No support if unknown address class */ | |
1112 | } | |
1113 | ||
1114 | /* Switch xvec to match the specified byte order. */ | |
1115 | switch (x_ehdr.e_ident[EI_DATA]) | |
1116 | { | |
1117 | case ELFDATA2MSB: /* Big-endian */ | |
1118 | if (!abfd->xvec->header_byteorder_big_p) | |
1119 | goto wrong; | |
1120 | break; | |
1121 | case ELFDATA2LSB: /* Little-endian */ | |
1122 | if (abfd->xvec->header_byteorder_big_p) | |
1123 | goto wrong; | |
1124 | break; | |
1125 | case ELFDATANONE: /* No data encoding specified */ | |
1126 | default: /* Unknown data encoding specified */ | |
1127 | goto wrong; | |
1128 | } | |
1129 | ||
1130 | /* Allocate an instance of the elf_obj_tdata structure and hook it up to | |
1131 | the tdata pointer in the bfd. */ | |
1132 | ||
1133 | if (NULL == (elf_tdata (abfd) = (struct elf_obj_tdata *) | |
1134 | bfd_zalloc (abfd, sizeof (struct elf_obj_tdata)))) | |
1135 | { | |
1136 | bfd_error = no_memory; | |
1137 | return (NULL); | |
1138 | } | |
1139 | ||
1140 | /* FIXME: Any `wrong' exits below here will leak memory (tdata). */ | |
1141 | ||
1142 | /* Now that we know the byte order, swap in the rest of the header */ | |
1143 | i_ehdrp = elf_elfheader (abfd); | |
1144 | elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp); | |
1145 | ||
1146 | /* If there is no section header table, we're hosed. */ | |
1147 | if (i_ehdrp->e_shoff == 0) | |
1148 | goto wrong; | |
1149 | ||
1150 | if (i_ehdrp->e_type == ET_EXEC || i_ehdrp->e_type == ET_DYN) | |
1151 | abfd -> flags |= EXEC_P; | |
1152 | ||
1153 | switch (i_ehdrp->e_machine) | |
1154 | { | |
1155 | case EM_NONE: | |
1156 | case EM_M32: /* or should this be bfd_arch_obscure? */ | |
1157 | bfd_default_set_arch_mach(abfd, bfd_arch_unknown, 0); | |
1158 | break; | |
1159 | case EM_SPARC: | |
1160 | bfd_default_set_arch_mach(abfd, bfd_arch_sparc, 0); | |
1161 | break; | |
1162 | case EM_386: | |
1163 | bfd_default_set_arch_mach(abfd, bfd_arch_i386, 0); | |
1164 | break; | |
1165 | case EM_68K: | |
1166 | bfd_default_set_arch_mach(abfd, bfd_arch_m68k, 0); | |
1167 | break; | |
1168 | case EM_88K: | |
1169 | bfd_default_set_arch_mach(abfd, bfd_arch_m88k, 0); | |
1170 | break; | |
1171 | case EM_860: | |
1172 | bfd_default_set_arch_mach(abfd, bfd_arch_i860, 0); | |
1173 | break; | |
1174 | case EM_MIPS: | |
1175 | bfd_default_set_arch_mach(abfd, bfd_arch_mips, 0); | |
1176 | break; | |
1177 | default: | |
1178 | goto wrong; | |
1179 | } | |
1180 | ||
1181 | /* Allocate space for a copy of the section header table in | |
1182 | internal form, seek to the section header table in the file, | |
1183 | read it in, and convert it to internal form. As a simple sanity | |
1184 | check, verify that the what BFD thinks is the size of each section | |
1185 | header table entry actually matches the size recorded in the file. */ | |
1186 | ||
1187 | if (i_ehdrp->e_shentsize != sizeof (x_shdr)) | |
1188 | goto wrong; | |
1189 | i_shdrp = (Elf_Internal_Shdr *) | |
1190 | bfd_alloc (abfd, sizeof (*i_shdrp) * i_ehdrp->e_shnum); | |
1191 | if (! i_shdrp) | |
1192 | { | |
1193 | bfd_error = no_memory; | |
1194 | return (NULL); | |
1195 | } | |
1196 | if (bfd_seek (abfd, i_ehdrp->e_shoff, SEEK_SET) == -1) | |
1197 | { | |
1198 | bfd_error = system_call_error; | |
1199 | return (NULL); | |
1200 | } | |
1201 | for (shindex = 0; shindex < i_ehdrp->e_shnum; shindex++) | |
1202 | { | |
1203 | if (bfd_read ((PTR) &x_shdr, sizeof x_shdr, 1, abfd) | |
1204 | != sizeof (x_shdr)) | |
1205 | { | |
1206 | bfd_error = system_call_error; | |
1207 | return (NULL); | |
1208 | } | |
1209 | elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex); | |
1210 | } | |
1211 | ||
1212 | elf_elfsections (abfd) = i_shdrp; | |
1213 | ||
1214 | /* Read in the string table containing the names of the sections. We | |
1215 | will need the base pointer to this table later. */ | |
1216 | /* We read this inline now, so that we don't have to go through | |
1217 | bfd_section_from_shdr with it (since this particular strtab is | |
1218 | used to find all of the ELF section names.) */ | |
1219 | ||
1220 | shstrtab = elf_get_str_section (abfd, i_ehdrp->e_shstrndx); | |
1221 | if (! shstrtab) | |
1222 | return (NULL); | |
1223 | ||
1224 | /* Once all of the section headers have been read and converted, we | |
1225 | can start processing them. Note that the first section header is | |
1226 | a dummy placeholder entry, so we ignore it. | |
1227 | ||
1228 | We also watch for the symbol table section and remember the file | |
1229 | offset and section size for both the symbol table section and the | |
1230 | associated string table section. */ | |
1231 | ||
1232 | for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++) | |
1233 | { | |
1234 | bfd_section_from_shdr (abfd, shindex); | |
1235 | } | |
1236 | ||
1237 | /* Remember the entry point specified in the ELF file header. */ | |
1238 | ||
1239 | bfd_get_start_address (abfd) = i_ehdrp->e_entry; | |
1240 | ||
1241 | return (abfd->xvec); | |
1242 | } | |
1243 | ||
1244 | /* Core files are simply standard ELF formatted files that partition | |
1245 | the file using the execution view of the file (program header table) | |
1246 | rather than the linking view. In fact, there is no section header | |
1247 | table in a core file. | |
1248 | ||
1249 | The process status information (including the contents of the general | |
1250 | register set) and the floating point register set are stored in a | |
1251 | segment of type PT_NOTE. We handcraft a couple of extra bfd sections | |
1252 | that allow standard bfd access to the general registers (.reg) and the | |
1253 | floating point registers (.reg2). | |
1254 | ||
1255 | */ | |
1256 | ||
1257 | bfd_target * | |
1258 | DEFUN (elf_core_file_p, (abfd), bfd *abfd) | |
1259 | { | |
1260 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ | |
1261 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ | |
1262 | Elf_External_Phdr x_phdr; /* Program header table entry, external form */ | |
1263 | Elf_Internal_Phdr *i_phdrp; /* Program header table, internal form */ | |
1264 | unsigned int phindex; | |
1265 | ||
1266 | /* Read in the ELF header in external format. */ | |
1267 | ||
1268 | if (bfd_read ((PTR) &x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr)) | |
1269 | { | |
1270 | bfd_error = system_call_error; | |
1271 | return (NULL); | |
1272 | } | |
1273 | ||
1274 | /* Now check to see if we have a valid ELF file, and one that BFD can | |
1275 | make use of. The magic number must match, the address size ('class') | |
1276 | and byte-swapping must match our XVEC entry, and it must have a | |
1277 | program header table (FIXME: See comments re segments at top of this | |
1278 | file). */ | |
1279 | ||
1280 | if (x_ehdr.e_ident[EI_MAG0] != ELFMAG0 || | |
1281 | x_ehdr.e_ident[EI_MAG1] != ELFMAG1 || | |
1282 | x_ehdr.e_ident[EI_MAG2] != ELFMAG2 || | |
1283 | x_ehdr.e_ident[EI_MAG3] != ELFMAG3) | |
1284 | { | |
1285 | wrong: | |
1286 | bfd_error = wrong_format; | |
1287 | return (NULL); | |
1288 | } | |
1289 | ||
1290 | /* FIXME, Check EI_VERSION here ! */ | |
1291 | ||
1292 | switch (x_ehdr.e_ident[EI_CLASS]) | |
1293 | { | |
1294 | case ELFCLASSNONE: /* address size not specified */ | |
1295 | goto wrong; /* No support if can't tell address size */ | |
1296 | case ELFCLASS32: /* 32-bit addresses */ | |
1297 | break; | |
1298 | case ELFCLASS64: /* 64-bit addresses */ | |
1299 | goto wrong; /* FIXME: 64 bits not yet supported */ | |
1300 | default: | |
1301 | goto wrong; /* No support if unknown address class */ | |
1302 | } | |
1303 | ||
1304 | /* Switch xvec to match the specified byte order. */ | |
1305 | switch (x_ehdr.e_ident[EI_DATA]) | |
1306 | { | |
1307 | case ELFDATA2MSB: /* Big-endian */ | |
1308 | if (abfd->xvec->byteorder_big_p == false) | |
1309 | goto wrong; | |
1310 | break; | |
1311 | case ELFDATA2LSB: /* Little-endian */ | |
1312 | if (abfd->xvec->byteorder_big_p == true) | |
1313 | goto wrong; | |
1314 | break; | |
1315 | case ELFDATANONE: /* No data encoding specified */ | |
1316 | default: /* Unknown data encoding specified */ | |
1317 | goto wrong; | |
1318 | } | |
1319 | ||
1320 | /* Allocate an instance of the elf_obj_tdata structure and hook it up to | |
1321 | the tdata pointer in the bfd. */ | |
1322 | ||
1323 | elf_tdata (abfd) = | |
1324 | (struct elf_obj_tdata *) bfd_zalloc (abfd, sizeof (struct elf_obj_tdata)); | |
1325 | if (elf_tdata (abfd) == NULL) | |
1326 | { | |
1327 | bfd_error = no_memory; | |
1328 | return (NULL); | |
1329 | } | |
1330 | ||
1331 | /* FIXME, `wrong' returns from this point onward, leak memory. */ | |
1332 | ||
1333 | /* Now that we know the byte order, swap in the rest of the header */ | |
1334 | i_ehdrp = elf_elfheader (abfd); | |
1335 | elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp); | |
1336 | ||
1337 | /* If there is no program header, or the type is not a core file, then | |
1338 | we are hosed. */ | |
1339 | if (i_ehdrp->e_phoff == 0 || i_ehdrp->e_type != ET_CORE) | |
1340 | goto wrong; | |
1341 | ||
1342 | /* Allocate space for a copy of the program header table in | |
1343 | internal form, seek to the program header table in the file, | |
1344 | read it in, and convert it to internal form. As a simple sanity | |
1345 | check, verify that the what BFD thinks is the size of each program | |
1346 | header table entry actually matches the size recorded in the file. */ | |
1347 | ||
1348 | if (i_ehdrp->e_phentsize != sizeof (x_phdr)) | |
1349 | goto wrong; | |
1350 | i_phdrp = (Elf_Internal_Phdr *) | |
1351 | bfd_alloc (abfd, sizeof (*i_phdrp) * i_ehdrp->e_phnum); | |
1352 | if (! i_phdrp) | |
1353 | { | |
1354 | bfd_error = no_memory; | |
1355 | return (NULL); | |
1356 | } | |
1357 | if (bfd_seek (abfd, i_ehdrp->e_phoff, SEEK_SET) == -1) | |
1358 | { | |
1359 | bfd_error = system_call_error; | |
1360 | return (NULL); | |
1361 | } | |
1362 | for (phindex = 0; phindex < i_ehdrp->e_phnum; phindex++) | |
1363 | { | |
1364 | if (bfd_read ((PTR) &x_phdr, sizeof (x_phdr), 1, abfd) | |
1365 | != sizeof (x_phdr)) | |
1366 | { | |
1367 | bfd_error = system_call_error; | |
1368 | return (NULL); | |
1369 | } | |
1370 | elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex); | |
1371 | } | |
1372 | ||
1373 | /* Once all of the program headers have been read and converted, we | |
1374 | can start processing them. */ | |
1375 | ||
1376 | for (phindex = 0; phindex < i_ehdrp->e_phnum; phindex++) | |
1377 | { | |
1378 | bfd_section_from_phdr (abfd, i_phdrp + phindex, phindex); | |
1379 | if ((i_phdrp + phindex) -> p_type == PT_NOTE) | |
1380 | { | |
1381 | elf_corefile_note (abfd, i_phdrp + phindex); | |
1382 | } | |
1383 | } | |
1384 | ||
1385 | /* Remember the entry point specified in the ELF file header. */ | |
1386 | ||
1387 | bfd_get_start_address (abfd) = i_ehdrp->e_entry; | |
1388 | ||
1389 | return (abfd->xvec); | |
1390 | } | |
1391 | ||
1392 | boolean | |
1393 | DEFUN (elf_mkobject, (abfd), bfd *abfd) | |
1394 | { | |
1395 | /* this just does initialization */ | |
1396 | /* coff_mkobject zalloc's space for tdata.coff_obj_data ... */ | |
1397 | elf_tdata(abfd) = (struct elf_obj_tdata *) | |
1398 | bfd_zalloc (abfd, sizeof(struct elf_obj_tdata)); | |
1399 | if (elf_tdata(abfd) == 0) { | |
1400 | bfd_error = no_memory; | |
1401 | return false; | |
1402 | } | |
1403 | /* since everything is done at close time, do we need any | |
1404 | initialization? */ | |
1405 | ||
1406 | return (true); | |
1407 | } | |
1408 | ||
1409 | /* | |
1410 | Create ELF output from BFD sections. | |
1411 | ||
1412 | Essentially, just create the section header and forget about the program | |
1413 | header for now. | |
1414 | ||
1415 | */ | |
1416 | ||
1417 | /* lacking nested functions and nested types, set up for mapping over | |
1418 | BFD sections to produce ELF sections */ | |
1419 | ||
1420 | typedef struct { | |
1421 | Elf_Internal_Ehdr *i_ehdr; | |
1422 | Elf_Internal_Shdr *i_shdrp; | |
1423 | struct strtab *shstrtab; | |
1424 | int symtab_section; | |
1425 | } elf_sect_thunk; | |
1426 | ||
1427 | ||
1428 | ||
1429 | static void | |
1430 | DEFUN (elf_make_sections, (abfd, asect, obj), | |
1431 | bfd *abfd AND | |
1432 | asection *asect AND | |
1433 | PTR obj) | |
1434 | { | |
1435 | elf_sect_thunk *thunk = (elf_sect_thunk*)obj; | |
1436 | /* most of what is in bfd_shdr_from_section goes in here... */ | |
1437 | /* and all of these sections generate at *least* one ELF section. */ | |
1438 | int this_section; | |
1439 | int idx; | |
1440 | ||
1441 | /* check if we're making a PROGBITS section... */ | |
1442 | /* if ((asect->flags & SEC_ALLOC) && (asect->flags & SEC_LOAD)) */ | |
1443 | /* this was too strict... what *do* we want to check here? */ | |
1444 | if(1) | |
1445 | { | |
1446 | Elf_Internal_Shdr *this_hdr; | |
1447 | this_section = elf_section_from_bfd_section (abfd, asect); | |
1448 | this_hdr = &thunk->i_shdrp[this_section]; | |
1449 | ||
1450 | this_hdr->sh_addr = asect->vma; | |
1451 | this_hdr->sh_size = asect->_raw_size; | |
1452 | /* contents already set by elf_set_section_contents */ | |
1453 | ||
1454 | if (asect->flags & SEC_RELOC) | |
1455 | { | |
1456 | /* emit a reloc section, and thus strtab and symtab... */ | |
1457 | Elf_Internal_Shdr *rela_hdr; | |
1458 | Elf_Internal_Shdr *symtab_hdr; | |
1459 | Elf_External_Rela *outbound_relocs; | |
1460 | int rela_section; | |
1461 | ||
1462 | symtab_hdr = &thunk->i_shdrp[thunk->symtab_section]; | |
1463 | ||
1464 | if (thunk->symtab_section == this_section + 1) | |
1465 | rela_section = thunk->symtab_section + 2; /* symtab + symstrtab */ | |
1466 | else | |
1467 | rela_section = this_section + 1; | |
1468 | rela_hdr = &thunk->i_shdrp[rela_section]; | |
1469 | rela_hdr->sh_type = SHT_RELA; | |
1470 | rela_hdr->sh_link = thunk->symtab_section; | |
1471 | rela_hdr->sh_info = this_section; | |
1472 | rela_hdr->sh_entsize = sizeof (Elf_External_Rela); | |
1473 | /* orelocation has the data, reloc_count has the count... */ | |
1474 | rela_hdr->sh_size = rela_hdr->sh_entsize * asect->reloc_count; | |
1475 | outbound_relocs = (Elf_External_Rela *) | |
1476 | bfd_alloc(abfd, asect->reloc_count * sizeof(Elf_External_Rela)); | |
1477 | for (idx = 0; idx < asect->reloc_count; idx++) | |
1478 | { | |
1479 | Elf_Internal_Rela dst; | |
1480 | arelent *ptr; | |
1481 | Elf_External_Rela *src; | |
1482 | ||
1483 | ptr = asect->orelocation[idx]; | |
1484 | src = outbound_relocs + idx; | |
1485 | if (asect->flags & SEC_RELOC) | |
1486 | dst.r_offset = ptr->address - asect->vma; | |
1487 | else | |
1488 | dst.r_offset = ptr->address; | |
1489 | ||
1490 | dst.r_info = ELF_R_INFO(1 /*ptr->sym_ptr_ptr*/, /* needs index into symtab (FIXME) */ | |
1491 | ptr->howto->type); | |
1492 | ||
1493 | dst.r_addend = ptr->addend; | |
1494 | elf_swap_reloca_out(abfd, &dst, src); | |
1495 | } | |
1496 | rela_hdr->contents = (void*)outbound_relocs; | |
1497 | } | |
1498 | } | |
1499 | } | |
1500 | ||
1501 | static void | |
1502 | DEFUN (elf_fake_sections, (abfd, asect, obj), | |
1503 | bfd *abfd AND | |
1504 | asection *asect AND | |
1505 | PTR obj) | |
1506 | { | |
1507 | elf_sect_thunk *thunk = (elf_sect_thunk*)obj; | |
1508 | /* most of what is in bfd_shdr_from_section goes in here... */ | |
1509 | /* and all of these sections generate at *least* one ELF section. */ | |
1510 | int this_section; | |
1511 | ||
1512 | /* check if we're making a PROGBITS section... */ | |
1513 | /* if ((asect->flags & SEC_ALLOC) && (asect->flags & SEC_LOAD)) */ | |
1514 | /* this was too strict... what *do* we want to check here? */ | |
1515 | if(1) | |
1516 | { | |
1517 | Elf_Internal_Shdr *this_hdr; | |
1518 | this_section = thunk->i_ehdr->e_shnum++; | |
1519 | this_hdr = &thunk->i_shdrp[this_section]; | |
1520 | this_hdr->sh_name = | |
1521 | bfd_add_to_strtab (abfd, thunk->shstrtab, asect->name); | |
1522 | /* we need to log the type *now* so that elf_section_from_bfd_section | |
1523 | can find us... have to set rawdata too. */ | |
1524 | this_hdr->rawdata = (void*)asect; | |
1525 | if ((asect->flags & SEC_ALLOC) && (asect->flags & SEC_LOAD)) | |
1526 | this_hdr->sh_type = SHT_PROGBITS; | |
1527 | else | |
1528 | /* what *do* we put here? */ | |
1529 | this_hdr->sh_type = SHT_PROGBITS; | |
1530 | ||
1531 | ||
1532 | if (asect->flags & SEC_RELOC) | |
1533 | { | |
1534 | /* emit a reloc section, and thus strtab and symtab... */ | |
1535 | Elf_Internal_Shdr *rela_hdr; | |
1536 | Elf_Internal_Shdr *symtab_hdr; | |
1537 | Elf_Internal_Shdr *symstrtab_hdr; | |
1538 | int rela_section; | |
1539 | int symstrtab_section; | |
1540 | ||
1541 | /* note that only one symtab is used, so just remember it | |
1542 | for now */ | |
1543 | if (! thunk->symtab_section) | |
1544 | { | |
1545 | thunk->symtab_section = thunk->i_ehdr->e_shnum++; | |
1546 | symtab_hdr = &thunk->i_shdrp[thunk->symtab_section]; | |
1547 | symtab_hdr->sh_name = | |
1548 | bfd_add_to_strtab (abfd, thunk->shstrtab, ".symtab"); | |
1549 | symtab_hdr->sh_type = SHT_SYMTAB; | |
1550 | symtab_hdr->sh_entsize = sizeof (Elf_External_Sym); | |
1551 | ||
1552 | symstrtab_section = thunk->i_ehdr->e_shnum++; | |
1553 | BFD_ASSERT(symstrtab_section == thunk->symtab_section+1); | |
1554 | symstrtab_hdr = &thunk->i_shdrp[symstrtab_section]; | |
1555 | symtab_hdr->sh_link = symstrtab_section; | |
1556 | symstrtab_hdr->sh_name = | |
1557 | bfd_add_to_strtab (abfd, thunk->shstrtab, ".strtab"); | |
1558 | symstrtab_hdr->sh_type = SHT_STRTAB; | |
1559 | ||
1560 | symtab_hdr->contents = 0; | |
1561 | symstrtab_hdr->contents = 0; | |
1562 | symstrtab_hdr->sh_size = 0; | |
1563 | } | |
1564 | else | |
1565 | symtab_hdr = &thunk->i_shdrp[thunk->symtab_section]; | |
1566 | ||
1567 | rela_section = thunk->i_ehdr->e_shnum++; | |
1568 | rela_hdr = &thunk->i_shdrp[rela_section]; | |
1569 | rela_hdr->sh_name = | |
1570 | bfd_add_2_to_strtab (abfd, thunk->shstrtab, ".rela", asect->name); | |
1571 | rela_hdr->sh_type = SHT_RELA; | |
1572 | rela_hdr->sh_link = thunk->symtab_section; | |
1573 | rela_hdr->sh_info = this_section; | |
1574 | rela_hdr->sh_entsize = sizeof (Elf_External_Rela); | |
1575 | } | |
1576 | } | |
1577 | } | |
1578 | ||
1579 | ||
1580 | static boolean | |
1581 | DEFUN (elf_compute_section_file_positions, (abfd), bfd *abfd) | |
1582 | { | |
1583 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ | |
1584 | Elf_Internal_Shdr *i_shdrp; /* Section header table, internal form */ | |
1585 | struct strtab *shstrtab; | |
1586 | int count, maxsections; | |
1587 | elf_sect_thunk est; | |
1588 | ||
1589 | if (! elf_shstrtab (abfd)) { | |
1590 | i_ehdrp = elf_elfheader (abfd); /* build new header in tdata memory */ | |
1591 | shstrtab = bfd_new_strtab(abfd); | |
1592 | ||
1593 | i_ehdrp->e_ident[EI_MAG0] = ELFMAG0; | |
1594 | i_ehdrp->e_ident[EI_MAG1] = ELFMAG1; | |
1595 | i_ehdrp->e_ident[EI_MAG2] = ELFMAG2; | |
1596 | i_ehdrp->e_ident[EI_MAG3] = ELFMAG3; | |
1597 | ||
1598 | i_ehdrp->e_ident[EI_CLASS] = ELFCLASS32; /* FIXME: find out from bfd */ | |
1599 | i_ehdrp->e_ident[EI_DATA] = | |
1600 | abfd->xvec->byteorder_big_p ? ELFDATA2MSB : ELFDATA2LSB; | |
1601 | i_ehdrp->e_ident[EI_VERSION] = EV_CURRENT; | |
1602 | ||
1603 | for(count = EI_PAD; count < EI_NIDENT; count ++) | |
1604 | i_ehdrp->e_ident[count] = 0; | |
1605 | ||
1606 | i_ehdrp->e_type = (abfd->flags & EXEC_P)? ET_EXEC : ET_REL; | |
1607 | switch(bfd_get_arch(abfd)) | |
1608 | { | |
1609 | case bfd_arch_unknown: | |
1610 | i_ehdrp->e_machine = EM_NONE; | |
1611 | break; | |
1612 | case bfd_arch_sparc: | |
1613 | i_ehdrp->e_machine = EM_SPARC; | |
1614 | break; | |
1615 | case bfd_arch_i386: | |
1616 | i_ehdrp->e_machine = EM_386; | |
1617 | break; | |
1618 | case bfd_arch_m68k: | |
1619 | i_ehdrp->e_machine = EM_68K; | |
1620 | break; | |
1621 | case bfd_arch_m88k: | |
1622 | i_ehdrp->e_machine = EM_88K; | |
1623 | break; | |
1624 | case bfd_arch_i860: | |
1625 | i_ehdrp->e_machine = EM_860; | |
1626 | break; | |
1627 | case bfd_arch_mips: /* MIPS Rxxxx */ | |
1628 | i_ehdrp->e_machine = EM_MIPS; /* only MIPS R3000 */ | |
1629 | break; | |
1630 | /* also note that EM_M32, AT&T WE32100 is unknown to bfd */ | |
1631 | default: | |
1632 | i_ehdrp->e_machine = EM_NONE; | |
1633 | } | |
1634 | i_ehdrp->e_version = EV_CURRENT; | |
1635 | i_ehdrp->e_ehsize = sizeof(Elf_External_Ehdr); | |
1636 | ||
1637 | /* no program header, for now. */ | |
1638 | i_ehdrp->e_phoff = 0; | |
1639 | i_ehdrp->e_phentsize = 0; | |
1640 | i_ehdrp->e_phnum = 0; | |
1641 | ||
1642 | /* each bfd section is section header entry */ | |
1643 | i_ehdrp->e_entry = bfd_get_start_address (abfd); | |
1644 | i_ehdrp->e_shentsize = sizeof (Elf_External_Shdr); | |
1645 | ||
1646 | /* figure at most each section can have a rel, strtab, symtab */ | |
1647 | maxsections = 4*bfd_count_sections(abfd)+2; | |
1648 | ||
1649 | i_ehdrp->e_shoff = i_ehdrp->e_ehsize; | |
1650 | ||
1651 | /* and we'll just have to fix up the offsets later. */ | |
1652 | /* outbase += i_ehdr.e_shentsize * i_ehdr.e_shnum; */ | |
1653 | ||
1654 | i_shdrp = (Elf_Internal_Shdr *) | |
1655 | bfd_alloc (abfd, sizeof (*i_shdrp) * maxsections); | |
1656 | if (! i_shdrp) | |
1657 | { | |
1658 | bfd_error = no_memory; | |
1659 | return (false); | |
1660 | } | |
1661 | for (count=0; count < maxsections; count++) | |
1662 | { | |
1663 | i_shdrp[count].rawdata = 0; | |
1664 | i_shdrp[count].contents = 0; | |
1665 | } | |
1666 | ||
1667 | ||
1668 | i_shdrp[0].sh_name = 0; | |
1669 | i_shdrp[0].sh_type = SHT_NULL; | |
1670 | i_shdrp[0].sh_flags = 0; | |
1671 | i_shdrp[0].sh_addr = 0; | |
1672 | i_shdrp[0].sh_offset = 0; | |
1673 | i_shdrp[0].sh_size = 0; | |
1674 | i_shdrp[0].sh_link = SHN_UNDEF; | |
1675 | i_shdrp[0].sh_info = 0; | |
1676 | i_shdrp[0].sh_addralign = 0; | |
1677 | i_shdrp[0].sh_entsize = 0; | |
1678 | ||
1679 | i_ehdrp->e_shnum = 1; | |
1680 | ||
1681 | elf_elfsections (abfd) = i_shdrp; | |
1682 | elf_shstrtab (abfd) = shstrtab; | |
1683 | } | |
1684 | est.i_ehdr = elf_elfheader(abfd); | |
1685 | est.i_shdrp = elf_elfsections(abfd); | |
1686 | est.shstrtab = elf_shstrtab(abfd); | |
1687 | est.symtab_section = 0; /* elf_fake_sections fils it in */ | |
1688 | ||
1689 | bfd_map_over_sections(abfd, elf_fake_sections, &est); | |
1690 | elf_onesymtab (abfd) = est.symtab_section; | |
1691 | return (true); | |
1692 | } | |
1693 | ||
1694 | boolean | |
1695 | DEFUN (elf_write_object_contents, (abfd), bfd *abfd) | |
1696 | { | |
1697 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ | |
1698 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ | |
1699 | Elf_External_Shdr *x_shdrp; /* Section header table, external form */ | |
1700 | Elf_Internal_Shdr *i_shdrp; /* Section header table, internal form */ | |
1701 | asection *nsect; | |
1702 | elf_sect_thunk est; | |
1703 | ||
1704 | int outbase = 0; | |
1705 | int count; | |
1706 | struct strtab *shstrtab; | |
1707 | ||
1708 | if(abfd->output_has_begun == false) | |
1709 | elf_compute_section_file_positions(abfd); | |
1710 | ||
1711 | i_ehdrp = elf_elfheader (abfd); | |
1712 | i_shdrp = elf_elfsections (abfd); | |
1713 | shstrtab = elf_shstrtab (abfd); | |
1714 | ||
1715 | est.i_ehdr = i_ehdrp; | |
1716 | est.i_shdrp = i_shdrp; | |
1717 | est.shstrtab = shstrtab; | |
1718 | est.symtab_section = elf_onesymtab (abfd); /* filled in by elf_fake */ | |
1719 | ||
1720 | bfd_map_over_sections(abfd, elf_make_sections, &est); | |
1721 | ||
1722 | /* dump out the one symtab */ | |
1723 | { | |
1724 | int symcount = bfd_get_symcount (abfd); | |
1725 | asymbol ** syms = bfd_get_outsymbols (abfd); | |
1726 | struct strtab * stt = bfd_new_strtab (abfd); | |
1727 | Elf_Internal_Shdr *symtab_hdr; | |
1728 | Elf_Internal_Shdr *symstrtab_hdr; | |
1729 | int symstrtab_section; | |
1730 | Elf_External_Sym *outbound_syms; | |
1731 | int idx; | |
1732 | ||
1733 | symtab_hdr = &i_shdrp[est.symtab_section]; | |
1734 | symtab_hdr->sh_type = SHT_SYMTAB; | |
1735 | symtab_hdr->sh_entsize = sizeof (Elf_External_Sym); | |
1736 | symtab_hdr->sh_size = symtab_hdr->sh_entsize * symcount; | |
1737 | ||
1738 | /* see assert in elf_fake_sections that supports this: */ | |
1739 | symstrtab_section = est.symtab_section+1; | |
1740 | symstrtab_hdr = &i_shdrp[symstrtab_section]; | |
1741 | symtab_hdr->sh_link = symstrtab_section; | |
1742 | symstrtab_hdr->sh_type = SHT_STRTAB; | |
1743 | ||
1744 | outbound_syms = (Elf_External_Sym*) | |
1745 | bfd_alloc(abfd, (1+symcount) * sizeof(Elf_External_Sym)); | |
1746 | /* now generate the data (for "contents") */ | |
1747 | for (idx = 0; idx < symcount; idx++) | |
1748 | { | |
1749 | Elf_Internal_Sym sym; | |
1750 | sym.st_name = bfd_add_to_strtab (abfd, stt, syms[idx]->name); | |
1751 | sym.st_value = syms[idx]->value; | |
1752 | sym.st_size = 0; /* we should recover this (FIXME) */ | |
1753 | if (syms[idx]->flags & BSF_WEAK) | |
1754 | sym.st_info = ELF_ST_INFO(STB_WEAK, STT_OBJECT); | |
1755 | else if (syms[idx]->flags & BSF_LOCAL) | |
1756 | sym.st_info = ELF_ST_INFO(STB_LOCAL, STT_OBJECT); | |
1757 | else if (syms[idx]->flags & BSF_GLOBAL) | |
1758 | sym.st_info = ELF_ST_INFO(STB_GLOBAL, STT_OBJECT); | |
1759 | else if (syms[idx]->flags & BSF_SECTION_SYM) | |
1760 | sym.st_info = ELF_ST_INFO(STB_LOCAL, STT_SECTION); | |
1761 | else if (syms[idx]->flags & BSF_FILE) | |
1762 | sym.st_info = ELF_ST_INFO(STB_LOCAL, STT_FILE); | |
1763 | ||
1764 | sym.st_other = 0; | |
1765 | if (syms[idx]->section) | |
1766 | sym.st_shndx = | |
1767 | elf_section_from_bfd_section(abfd, | |
1768 | syms[idx]->section->output_section); | |
1769 | else | |
1770 | sym.st_shndx = SHN_UNDEF; | |
1771 | ||
1772 | elf_swap_symbol_out (abfd, &sym, outbound_syms+idx+1); | |
1773 | } | |
1774 | { | |
1775 | /* fill in 0th symbol */ | |
1776 | Elf_Internal_Sym sym; | |
1777 | sym.st_name = 0; | |
1778 | sym.st_value = 0; | |
1779 | sym.st_size = 0; | |
1780 | sym.st_info = 0; | |
1781 | sym.st_other = 0; | |
1782 | sym.st_shndx = SHN_UNDEF; | |
1783 | elf_swap_symbol_out (abfd, &sym, outbound_syms); | |
1784 | } | |
1785 | symtab_hdr->contents = (void*)outbound_syms; | |
1786 | symstrtab_hdr->contents = (void*)stt->tab; | |
1787 | symstrtab_hdr->sh_size = stt->length; | |
1788 | } | |
1789 | ||
1790 | /* put the strtab out too... */ | |
1791 | { | |
1792 | Elf_Internal_Shdr *this_hdr; | |
1793 | int this_section; | |
1794 | ||
1795 | this_section = i_ehdrp->e_shnum++; | |
1796 | i_ehdrp->e_shstrndx = this_section; | |
1797 | this_hdr = &i_shdrp[this_section]; | |
1798 | this_hdr->sh_name = bfd_add_to_strtab (abfd, shstrtab, ".shstrtab"); | |
1799 | this_hdr->sh_type = SHT_STRTAB; | |
1800 | this_hdr->sh_size = shstrtab->length; | |
1801 | this_hdr->contents = (void*)shstrtab->tab; | |
1802 | } | |
1803 | ||
1804 | outbase = i_ehdrp->e_ehsize; | |
1805 | ||
1806 | /* swap the header before spitting it out... */ | |
1807 | elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr); | |
1808 | bfd_seek (abfd, (file_ptr) 0, SEEK_SET); | |
1809 | bfd_write ((PTR) &x_ehdr, sizeof(x_ehdr), 1, abfd); | |
1810 | ||
1811 | outbase += i_ehdrp->e_shentsize * i_ehdrp->e_shnum; | |
1812 | ||
1813 | /* now we fix up the offsets... */ | |
1814 | for (count = 1; count < i_ehdrp->e_shnum; count ++) | |
1815 | { | |
1816 | i_shdrp[count].sh_offset = outbase; | |
1817 | outbase += i_shdrp[count].sh_size; | |
1818 | } | |
1819 | ||
1820 | /* at this point we've concocted all the ELF sections... */ | |
1821 | x_shdrp = (Elf_External_Shdr *) | |
1822 | bfd_alloc (abfd, sizeof (*x_shdrp) * (i_ehdrp->e_shnum)); | |
1823 | if (! x_shdrp) | |
1824 | { | |
1825 | bfd_error = no_memory; | |
1826 | return (false); | |
1827 | } | |
1828 | ||
1829 | for (count = 0; count < i_ehdrp->e_shnum; count ++) | |
1830 | { | |
1831 | elf_swap_shdr_out (abfd, i_shdrp+count, x_shdrp+count); | |
1832 | } | |
1833 | bfd_write ((PTR) x_shdrp, sizeof(*x_shdrp), i_ehdrp->e_shnum, abfd); | |
1834 | /* need to dump the string table too... */ | |
1835 | ||
1836 | /* after writing the headers, we need to write the sections too... */ | |
1837 | nsect = abfd->sections; | |
1838 | for (count = 0; count < i_ehdrp->e_shnum; count ++) | |
1839 | { | |
1840 | if(i_shdrp[count].contents) | |
1841 | { | |
1842 | bfd_seek (abfd, i_shdrp[count].sh_offset, SEEK_SET); | |
1843 | bfd_write (i_shdrp[count].contents, i_shdrp[count].sh_size, 1, abfd); | |
1844 | } | |
1845 | } | |
1846 | ||
1847 | /* sample use of bfd: | |
1848 | * bfd_seek (abfd, (file_ptr) 0, SEEK_SET); | |
1849 | * bfd_write ((PTR) &exec_bytes, 1, EXEC_BYTES_SIZE, abfd); | |
1850 | * if (bfd_seek(abfd, scn_base, SEEK_SET) != 0) | |
1851 | * return false; | |
1852 | * old = bfd_tell(abfd); | |
1853 | */ | |
1854 | ||
1855 | return true; | |
1856 | ||
1857 | } | |
1858 | ||
1859 | /* Given an index of a section, retrieve a pointer to it. Note | |
1860 | that for our purposes, sections are indexed by {1, 2, ...} with | |
1861 | 0 being an illegal index. */ | |
1862 | ||
1863 | /* In the original, each ELF section went into exactly one BFD | |
1864 | section. This doesn't really make sense, so we need a real mapping. | |
1865 | The mapping has to hide in the Elf_Internal_Shdr since asection | |
1866 | doesn't have anything like a tdata field... */ | |
1867 | ||
1868 | static struct sec * | |
1869 | DEFUN (section_from_elf_index, (abfd, index), | |
1870 | bfd *abfd AND | |
1871 | int index) | |
1872 | { | |
1873 | Elf_Internal_Shdr *i_shdrp = elf_elfsections (abfd); | |
1874 | Elf_Internal_Shdr *hdr = i_shdrp + index; | |
1875 | ||
1876 | switch (hdr->sh_type) | |
1877 | { | |
1878 | /* ELF sections that map to BFD sections */ | |
1879 | case SHT_PROGBITS: | |
1880 | case SHT_NOBITS: | |
1881 | if (! hdr->rawdata) | |
1882 | bfd_section_from_shdr (abfd, index); | |
1883 | return (struct sec *)hdr->rawdata; | |
1884 | ||
1885 | default: | |
1886 | return (struct sec *)&bfd_abs_section; | |
1887 | } | |
1888 | } | |
1889 | ||
1890 | /* given a section, search the header to find them... */ | |
1891 | static int | |
1892 | DEFUN (elf_section_from_bfd_section, (abfd, asect), | |
1893 | bfd *abfd AND | |
1894 | struct sec *asect) | |
1895 | { | |
1896 | Elf_Internal_Shdr *i_shdrp = elf_elfsections (abfd); | |
1897 | int index; | |
1898 | Elf_Internal_Shdr *hdr; | |
1899 | int maxindex = elf_elfheader (abfd)->e_shnum; | |
1900 | ||
1901 | for(index = 0; index < maxindex; index++) { | |
1902 | hdr = &i_shdrp[index]; | |
1903 | switch (hdr->sh_type) | |
1904 | { | |
1905 | /* ELF sections that map to BFD sections */ | |
1906 | case SHT_PROGBITS: | |
1907 | case SHT_NOBITS: | |
1908 | if (hdr->rawdata) | |
1909 | { | |
1910 | if (((struct sec *)(hdr->rawdata)) == asect) | |
1911 | return index; | |
1912 | } | |
1913 | break; | |
1914 | default: | |
1915 | break; | |
1916 | } | |
1917 | } | |
1918 | return 0; | |
1919 | } | |
1920 | ||
1921 | static boolean | |
1922 | DEFUN (elf_slurp_symbol_table, (abfd, symptrs), | |
1923 | bfd *abfd AND | |
1924 | asymbol **symptrs) /* Buffer for generated bfd symbols */ | |
1925 | { | |
1926 | Elf_Internal_Shdr *i_shdrp = elf_elfsections (abfd); | |
1927 | Elf_Internal_Shdr *hdr = i_shdrp + elf_onesymtab (abfd); | |
1928 | int symcount; /* Number of external ELF symbols */ | |
1929 | int i; | |
1930 | asymbol *sym; /* Pointer to current bfd symbol */ | |
1931 | asymbol *symbase; /* Buffer for generated bfd symbols */ | |
1932 | Elf_Internal_Sym i_sym; | |
1933 | Elf_External_Sym *x_symp; | |
1934 | ||
1935 | /* this is only valid because there is only one symtab... */ | |
1936 | /* FIXME: This is incorrect, there may also be a dynamic symbol | |
1937 | table which is a subset of the full symbol table. We either need | |
1938 | to be prepared to read both (and merge them) or ensure that we | |
1939 | only read the full symbol table. Currently we only get called to | |
1940 | read the full symbol table. -fnf */ | |
1941 | if (bfd_get_outsymbols (abfd) != NULL) | |
1942 | { | |
1943 | return (true); | |
1944 | } | |
1945 | ||
1946 | /* Read each raw ELF symbol, converting from external ELF form to | |
1947 | internal ELF form, and then using the information to create a | |
1948 | canonical bfd symbol table entry. | |
1949 | ||
1950 | Note that we allocate the initial bfd canonical symbol buffer | |
1951 | based on a one-to-one mapping of the ELF symbols to canonical | |
1952 | symbols. We actually use all the ELF symbols, so there will be no | |
1953 | space left over at the end. When we have all the symbols, we | |
1954 | build the caller's pointer vector. */ | |
1955 | ||
1956 | if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1) | |
1957 | { | |
1958 | bfd_error = system_call_error; | |
1959 | return (false); | |
1960 | } | |
1961 | ||
1962 | symcount = hdr->sh_size / sizeof (Elf_External_Sym); | |
1963 | symbase = (asymbol *) bfd_zalloc (abfd, symcount * sizeof (asymbol)); | |
1964 | sym = symbase; | |
1965 | ||
1966 | /* Temporarily allocate room for the raw ELF symbols. */ | |
1967 | x_symp = (Elf_External_Sym *) bfd_xmalloc (symcount * sizeof (Elf_External_Sym)); | |
1968 | ||
1969 | if (bfd_read ((PTR) x_symp, sizeof (Elf_External_Sym), symcount, abfd) | |
1970 | != symcount * sizeof (Elf_External_Sym)) | |
1971 | { | |
1972 | free ((PTR)x_symp); | |
1973 | bfd_error = system_call_error; | |
1974 | return (false); | |
1975 | } | |
1976 | /* Skip first symbol, which is a null dummy. */ | |
1977 | for (i = 1; i < symcount; i++) | |
1978 | { | |
1979 | elf_swap_symbol_in (abfd, x_symp + i, &i_sym); | |
1980 | sym -> the_bfd = abfd; | |
1981 | if (i_sym.st_name > 0) | |
1982 | sym -> name = elf_string_from_elf_section(abfd, hdr->sh_link, | |
1983 | i_sym.st_name); | |
1984 | else | |
1985 | sym -> name = "unnamed"; /* perhaps should include the number? */ | |
1986 | sym -> value = i_sym.st_value; | |
1987 | /* FIXME -- this is almost certainly bogus. It's from Pace Willisson's | |
1988 | hasty Solaris support, to pass the sizes of object files or functions | |
1989 | down into GDB via the back door, to circumvent some other kludge in | |
1990 | how Sun hacked stabs. -- gnu@cygnus.com */ | |
1991 | sym -> udata = (PTR)i_sym.st_size; | |
1992 | /* FIXME -- end of bogosity. */ | |
1993 | if (i_sym.st_shndx > 0 && i_sym.st_shndx < SHN_LORESERV) | |
1994 | { | |
1995 | sym -> section = section_from_elf_index (abfd, i_sym.st_shndx); | |
1996 | } | |
1997 | else if (i_sym.st_shndx == SHN_ABS) | |
1998 | { | |
1999 | sym -> section = &bfd_abs_section; | |
2000 | } | |
2001 | else if (i_sym.st_shndx == SHN_COMMON) | |
2002 | { | |
2003 | sym -> section = &bfd_com_section; | |
2004 | } | |
2005 | else if (i_sym.st_shndx == SHN_UNDEF) | |
2006 | { | |
2007 | sym -> section = &bfd_und_section; | |
2008 | } | |
2009 | else | |
2010 | sym -> section = &bfd_abs_section; | |
2011 | ||
2012 | switch (ELF_ST_BIND (i_sym.st_info)) | |
2013 | { | |
2014 | case STB_LOCAL: | |
2015 | sym -> flags |= BSF_LOCAL; | |
2016 | break; | |
2017 | case STB_GLOBAL: | |
2018 | sym -> flags |= (BSF_GLOBAL | BSF_EXPORT); | |
2019 | break; | |
2020 | case STB_WEAK: | |
2021 | sym -> flags |= BSF_WEAK; | |
2022 | break; | |
2023 | } | |
2024 | ||
2025 | switch (ELF_ST_TYPE (i_sym.st_info)) | |
2026 | { | |
2027 | case STT_SECTION: | |
2028 | sym->flags |= BSF_SECTION_SYM | BSF_DEBUGGING; | |
2029 | break; | |
2030 | case STT_FILE: | |
2031 | sym->flags |= BSF_FILE | BSF_DEBUGGING; | |
2032 | break; | |
2033 | } | |
2034 | sym++; | |
2035 | } | |
2036 | ||
2037 | /* We rely on the zalloc to clear out the final symbol entry. */ | |
2038 | ||
2039 | /* We're now done with the raw symbols. */ | |
2040 | free ((PTR)x_symp); | |
2041 | ||
2042 | bfd_get_symcount(abfd) = symcount = sym - symbase; | |
2043 | ||
2044 | /* Fill in the user's symbol pointer vector if needed. */ | |
2045 | if (symptrs) | |
2046 | { | |
2047 | sym = symbase; | |
2048 | while (symcount-- > 0) | |
2049 | { | |
2050 | *symptrs++ = sym++; | |
2051 | } | |
2052 | *symptrs = 0; /* Final null pointer */ | |
2053 | } | |
2054 | ||
2055 | return (true); | |
2056 | } | |
2057 | ||
2058 | /* Return the number of bytes required to hold the symtab vector. | |
2059 | ||
2060 | Note that we base it on the count plus 1, since we will null terminate | |
2061 | the vector allocated based on this size. However, the ELF symbol table | |
2062 | always has a dummy entry as symbol #0, so it ends up even. */ | |
2063 | ||
2064 | unsigned int | |
2065 | DEFUN (elf_get_symtab_upper_bound, (abfd), bfd *abfd) | |
2066 | { | |
2067 | unsigned int symcount; | |
2068 | unsigned int symtab_size = 0; | |
2069 | Elf_Internal_Shdr *i_shdrp; | |
2070 | Elf_Internal_Shdr *hdr; | |
2071 | ||
2072 | i_shdrp = elf_elfsections (abfd); | |
2073 | if (i_shdrp != NULL) | |
2074 | { | |
2075 | hdr = i_shdrp + elf_onesymtab (abfd); | |
2076 | symcount = hdr->sh_size / sizeof (Elf_External_Sym); | |
2077 | symtab_size = (symcount - 1 + 1) * (sizeof (asymbol)); | |
2078 | } | |
2079 | return (symtab_size); | |
2080 | } | |
2081 | ||
2082 | /* | |
2083 | This function return the number of bytes required to store the | |
2084 | relocation information associated with section <<sect>> | |
2085 | attached to bfd <<abfd>> | |
2086 | ||
2087 | */ | |
2088 | unsigned int | |
2089 | elf_get_reloc_upper_bound (abfd, asect) | |
2090 | bfd *abfd; | |
2091 | sec_ptr asect; | |
2092 | { | |
2093 | if (asect->flags & SEC_RELOC) | |
2094 | { | |
2095 | /* either rel or rela */ | |
2096 | return asect->_raw_size; | |
2097 | } | |
2098 | else | |
2099 | return (0); | |
2100 | } | |
2101 | ||
2102 | static boolean | |
2103 | DEFUN(elf_slurp_reloca_table,(abfd, asect, symbols), | |
2104 | bfd *abfd AND | |
2105 | sec_ptr asect AND | |
2106 | asymbol **symbols) | |
2107 | { | |
2108 | Elf_External_Rela *native_relocs; | |
2109 | arelent *reloc_cache; | |
2110 | arelent *cache_ptr; | |
2111 | ||
2112 | unsigned int idx; | |
2113 | ||
2114 | if (asect->relocation) | |
2115 | return true; | |
2116 | if (asect->reloc_count == 0) | |
2117 | return true; | |
2118 | if (asect->flags & SEC_CONSTRUCTOR) | |
2119 | return true; | |
2120 | ||
2121 | bfd_seek (abfd, asect->rel_filepos, SEEK_SET); | |
2122 | native_relocs = (Elf_External_Rela *) | |
2123 | bfd_alloc(abfd, asect->reloc_count * sizeof(Elf_External_Rela)); | |
2124 | bfd_read ((PTR) native_relocs, | |
2125 | sizeof(Elf_External_Rela), asect->reloc_count, abfd); | |
2126 | ||
2127 | reloc_cache = (arelent *) | |
2128 | bfd_alloc(abfd, (size_t) (asect->reloc_count * sizeof(arelent))); | |
2129 | ||
2130 | if (! reloc_cache) { | |
2131 | bfd_error = no_memory; | |
2132 | return false; | |
2133 | } | |
2134 | ||
2135 | for (idx = 0; idx < asect->reloc_count; idx ++) | |
2136 | { | |
2137 | #ifdef RELOC_PROCESSING | |
2138 | /* sparc, 68k, 88k, 860 use rela only. */ | |
2139 | /* 386 and we32000 use rel only... fix it for them later. */ | |
2140 | Elf_Internal_Rela dst; | |
2141 | Elf_External_Rela *src; | |
2142 | ||
2143 | cache_ptr = reloc_cache + idx; | |
2144 | src = native_relocs + idx; | |
2145 | elf_swap_reloca_in(abfd, src, &dst); | |
2146 | ||
2147 | RELOC_PROCESSING(cache_ptr, &dst, symbols, abfd, asect); | |
2148 | #else | |
2149 | Elf_Internal_Rela dst; | |
2150 | Elf_External_Rela *src; | |
2151 | ||
2152 | cache_ptr = reloc_cache + idx; | |
2153 | src = native_relocs + idx; | |
2154 | ||
2155 | elf_swap_reloca_in(abfd, src, &dst); | |
2156 | ||
2157 | if(asect->flags & SEC_RELOC) | |
2158 | { | |
2159 | /* relocatable, so the offset is off of the section */ | |
2160 | cache_ptr->address = dst.r_offset + asect->vma; | |
2161 | } | |
2162 | else | |
2163 | { | |
2164 | /* non-relocatable, so the offset a virtual address */ | |
2165 | cache_ptr->address = dst.r_offset; | |
2166 | } | |
2167 | /* ELF_R_SYM(dst.r_info) is the symbol table offset... */ | |
2168 | cache_ptr->sym_ptr_ptr = symbols + ELF_R_SYM(dst.r_info); | |
2169 | cache_ptr->addend = dst.r_addend; | |
2170 | ||
2171 | /* Fill in the cache_ptr->howto field from dst.r_type */ | |
2172 | { | |
2173 | struct elf_backend_data *ebd; | |
2174 | ebd = (struct elf_backend_data *) (abfd->xvec->backend_data); | |
2175 | (*ebd->elf_info_to_howto)(abfd, cache_ptr, &dst); | |
2176 | } | |
2177 | #endif | |
2178 | } | |
2179 | ||
2180 | asect->relocation = reloc_cache; | |
2181 | return true; | |
2182 | } | |
2183 | ||
2184 | ||
2185 | unsigned int | |
2186 | elf_canonicalize_reloc (abfd, section, relptr, symbols) | |
2187 | bfd *abfd; | |
2188 | sec_ptr section; | |
2189 | arelent **relptr; | |
2190 | asymbol **symbols; | |
2191 | { | |
2192 | arelent *tblptr = section->relocation; | |
2193 | unsigned int count = 0; | |
2194 | ||
2195 | /* snarfed from coffcode.h */ | |
2196 | /* FIXME: this could be reloc... */ | |
2197 | elf_slurp_reloca_table(abfd, section, symbols); | |
2198 | ||
2199 | tblptr = section->relocation; | |
2200 | if (!tblptr) | |
2201 | return 0; | |
2202 | ||
2203 | for (; count++ < section->reloc_count;) | |
2204 | *relptr++ = tblptr++; | |
2205 | ||
2206 | *relptr = 0; | |
2207 | return section->reloc_count; | |
2208 | } | |
2209 | ||
2210 | unsigned int | |
2211 | DEFUN (elf_get_symtab, (abfd, alocation), | |
2212 | bfd *abfd AND | |
2213 | asymbol **alocation) | |
2214 | { | |
2215 | ||
2216 | if (!elf_slurp_symbol_table (abfd, alocation)) | |
2217 | return (0); | |
2218 | else | |
2219 | return (bfd_get_symcount (abfd)); | |
2220 | } | |
2221 | ||
2222 | asymbol * | |
2223 | DEFUN (elf_make_empty_symbol, (abfd), | |
2224 | bfd *abfd) | |
2225 | { | |
2226 | elf_symbol_type *newsym; | |
2227 | ||
2228 | newsym = (elf_symbol_type *) bfd_zalloc (abfd, sizeof (elf_symbol_type)); | |
2229 | if (! newsym) | |
2230 | { | |
2231 | bfd_error = no_memory; | |
2232 | return (NULL); | |
2233 | } | |
2234 | else | |
2235 | { | |
2236 | newsym -> symbol.the_bfd = abfd; | |
2237 | return (&newsym -> symbol); | |
2238 | } | |
2239 | } | |
2240 | ||
2241 | void | |
2242 | DEFUN (elf_print_symbol,(ignore_abfd, filep, symbol, how), | |
2243 | bfd *ignore_abfd AND | |
2244 | PTR filep AND | |
2245 | asymbol *symbol AND | |
2246 | bfd_print_symbol_type how) | |
2247 | { | |
2248 | FILE *file = (FILE *)filep; | |
2249 | switch (how) | |
2250 | { | |
2251 | case bfd_print_symbol_name: | |
2252 | fprintf(file, "%s", symbol->name); | |
2253 | break; | |
2254 | case bfd_print_symbol_more: | |
2255 | fprintf(file, "elf %lx %lx", | |
2256 | symbol->value, | |
2257 | symbol->flags); | |
2258 | break; | |
2259 | case bfd_print_symbol_nm: | |
2260 | case bfd_print_symbol_all: | |
2261 | { | |
2262 | CONST char *section_name; | |
2263 | section_name = symbol->section? symbol->section->name : "(*none*)"; | |
2264 | bfd_print_symbol_vandf((PTR) file, symbol); | |
2265 | fprintf(file, " %s\t%s", | |
2266 | section_name, | |
2267 | symbol->name); | |
2268 | } | |
2269 | break; | |
2270 | } | |
2271 | ||
2272 | } | |
2273 | ||
2274 | alent * | |
2275 | DEFUN (elf_get_lineno,(ignore_abfd, symbol), | |
2276 | bfd *ignore_abfd AND | |
2277 | asymbol *symbol) | |
2278 | { | |
2279 | fprintf (stderr, "elf_get_lineno unimplemented\n"); | |
2280 | fflush (stderr); | |
2281 | abort (); | |
2282 | return (NULL); | |
2283 | } | |
2284 | ||
2285 | boolean | |
2286 | DEFUN (elf_set_arch_mach,(abfd, arch, machine), | |
2287 | bfd *abfd AND | |
2288 | enum bfd_architecture arch AND | |
2289 | unsigned long machine) | |
2290 | { | |
2291 | /* Allow any architecture to be supported by the elf backend */ | |
2292 | switch(arch) | |
2293 | { | |
2294 | case bfd_arch_unknown: /* EM_NONE */ | |
2295 | case bfd_arch_sparc: /* EM_SPARC */ | |
2296 | case bfd_arch_i386: /* EM_386 */ | |
2297 | case bfd_arch_m68k: /* EM_68K */ | |
2298 | case bfd_arch_m88k: /* EM_88K */ | |
2299 | case bfd_arch_i860: /* EM_860 */ | |
2300 | case bfd_arch_mips: /* EM_MIPS (MIPS R3000) */ | |
2301 | return bfd_default_set_arch_mach(abfd, arch, machine); | |
2302 | default: | |
2303 | return false; | |
2304 | } | |
2305 | } | |
2306 | ||
2307 | boolean | |
2308 | DEFUN (elf_find_nearest_line,(abfd, | |
2309 | section, | |
2310 | symbols, | |
2311 | offset, | |
2312 | filename_ptr, | |
2313 | functionname_ptr, | |
2314 | line_ptr), | |
2315 | bfd *abfd AND | |
2316 | asection *section AND | |
2317 | asymbol **symbols AND | |
2318 | bfd_vma offset AND | |
2319 | CONST char **filename_ptr AND | |
2320 | CONST char **functionname_ptr AND | |
2321 | unsigned int *line_ptr) | |
2322 | { | |
2323 | fprintf (stderr, "elf_find_nearest_line unimplemented\n"); | |
2324 | fflush (stderr); | |
2325 | abort (); | |
2326 | return (false); | |
2327 | } | |
2328 | ||
2329 | int | |
2330 | DEFUN (elf_sizeof_headers, (abfd, reloc), | |
2331 | bfd *abfd AND | |
2332 | boolean reloc) | |
2333 | { | |
2334 | fprintf (stderr, "elf_sizeof_headers unimplemented\n"); | |
2335 | fflush (stderr); | |
2336 | abort (); | |
2337 | return (0); | |
2338 | } | |
2339 | ||
2340 | boolean | |
2341 | DEFUN(elf_set_section_contents, (abfd, section, location, offset, count), | |
2342 | bfd *abfd AND | |
2343 | sec_ptr section AND | |
2344 | PTR location AND | |
2345 | file_ptr offset AND | |
2346 | bfd_size_type count) | |
2347 | { | |
2348 | int dest_sect; | |
2349 | void *contents; | |
2350 | if (abfd->output_has_begun == false) /* set by bfd.c handler? */ | |
2351 | { | |
2352 | /* do setup calculations (FIXME) */ | |
2353 | elf_compute_section_file_positions(abfd); | |
2354 | } | |
2355 | #if 0 | |
2356 | if(bfd_seek (abfd, (file_ptr)section->filepos + offset, SEEK_SET) == -1) | |
2357 | return false; | |
2358 | if(bfd_write (location, (bfd_size_type)1, count, abfd) != count) | |
2359 | return false; | |
2360 | #endif | |
2361 | /* we really just need to save the contents away... */ | |
2362 | dest_sect = elf_section_from_bfd_section(abfd, section); | |
2363 | if(!dest_sect) | |
2364 | return false; | |
2365 | ||
2366 | /* FIXME: allocate in set_section_size, then copy in here... */ | |
2367 | contents = (void*)bfd_alloc(abfd, count); | |
2368 | BFD_ASSERT(contents); | |
2369 | memcpy(contents, location, count); | |
2370 | elf_elfsections (abfd)[dest_sect].contents = contents; | |
2371 | ||
2372 | return true; | |
2373 | } | |
2374 | ||
2375 | void | |
2376 | DEFUN (elf_no_info_to_howto, (abfd, cache_ptr, dst), | |
2377 | bfd *abfd AND | |
2378 | arelent *cache_ptr AND | |
2379 | Elf_Internal_Rela *dst) | |
2380 | { | |
2381 | abort (); | |
2382 | } |