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252b5132 RH |
1 | /* ELF executable support for BFD. |
2 | Copyright 1991, 92, 93, 94, 95, 96, 97, 1998 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. Further work done by Ken Raeburn (Cygnus Support), Michael | |
13 | Meissner (Open Software Foundation), and Peter Hoogenboom (University | |
14 | of Utah) to finish and extend this. | |
15 | ||
16 | This file is part of BFD, the Binary File Descriptor library. | |
17 | ||
18 | This program is free software; you can redistribute it and/or modify | |
19 | it under the terms of the GNU General Public License as published by | |
20 | the Free Software Foundation; either version 2 of the License, or | |
21 | (at your option) any later version. | |
22 | ||
23 | This program is distributed in the hope that it will be useful, | |
24 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
26 | GNU General Public License for more details. | |
27 | ||
28 | You should have received a copy of the GNU General Public License | |
29 | along with this program; if not, write to the Free Software | |
30 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
31 | ||
32 | /* Problems and other issues to resolve. | |
33 | ||
34 | (1) BFD expects there to be some fixed number of "sections" in | |
35 | the object file. I.E. there is a "section_count" variable in the | |
36 | bfd structure which contains the number of sections. However, ELF | |
37 | supports multiple "views" of a file. In particular, with current | |
38 | implementations, executable files typically have two tables, a | |
39 | program header table and a section header table, both of which | |
40 | partition the executable. | |
41 | ||
42 | In ELF-speak, the "linking view" of the file uses the section header | |
43 | table to access "sections" within the file, and the "execution view" | |
44 | uses the program header table to access "segments" within the file. | |
45 | "Segments" typically may contain all the data from one or more | |
46 | "sections". | |
47 | ||
48 | Note that the section header table is optional in ELF executables, | |
49 | but it is this information that is most useful to gdb. If the | |
50 | section header table is missing, then gdb should probably try | |
51 | to make do with the program header table. (FIXME) | |
52 | ||
53 | (2) The code in this file is compiled twice, once in 32-bit mode and | |
54 | once in 64-bit mode. More of it should be made size-independent | |
55 | and moved into elf.c. | |
56 | ||
57 | (3) ELF section symbols are handled rather sloppily now. This should | |
58 | be cleaned up, and ELF section symbols reconciled with BFD section | |
59 | symbols. | |
60 | ||
61 | (4) We need a published spec for 64-bit ELF. We've got some stuff here | |
62 | that we're using for SPARC V9 64-bit chips, but don't assume that | |
63 | it's cast in stone. | |
64 | */ | |
65 | ||
66 | #include "bfd.h" | |
67 | #include "sysdep.h" | |
68 | #include "bfdlink.h" | |
69 | #include "libbfd.h" | |
70 | #include "elf-bfd.h" | |
71 | ||
72 | /* Renaming structures, typedefs, macros and functions to be size-specific. */ | |
73 | #define Elf_External_Ehdr NAME(Elf,External_Ehdr) | |
74 | #define Elf_External_Sym NAME(Elf,External_Sym) | |
75 | #define Elf_External_Shdr NAME(Elf,External_Shdr) | |
76 | #define Elf_External_Phdr NAME(Elf,External_Phdr) | |
77 | #define Elf_External_Rel NAME(Elf,External_Rel) | |
78 | #define Elf_External_Rela NAME(Elf,External_Rela) | |
79 | #define Elf_External_Dyn NAME(Elf,External_Dyn) | |
80 | ||
81 | #define elf_core_file_failing_command NAME(bfd_elf,core_file_failing_command) | |
82 | #define elf_core_file_failing_signal NAME(bfd_elf,core_file_failing_signal) | |
83 | #define elf_core_file_matches_executable_p \ | |
84 | NAME(bfd_elf,core_file_matches_executable_p) | |
85 | #define elf_object_p NAME(bfd_elf,object_p) | |
86 | #define elf_core_file_p NAME(bfd_elf,core_file_p) | |
87 | #define elf_get_symtab_upper_bound NAME(bfd_elf,get_symtab_upper_bound) | |
88 | #define elf_get_dynamic_symtab_upper_bound \ | |
89 | NAME(bfd_elf,get_dynamic_symtab_upper_bound) | |
90 | #define elf_swap_reloc_in NAME(bfd_elf,swap_reloc_in) | |
91 | #define elf_swap_reloca_in NAME(bfd_elf,swap_reloca_in) | |
92 | #define elf_swap_reloc_out NAME(bfd_elf,swap_reloc_out) | |
93 | #define elf_swap_reloca_out NAME(bfd_elf,swap_reloca_out) | |
94 | #define elf_swap_symbol_in NAME(bfd_elf,swap_symbol_in) | |
95 | #define elf_swap_symbol_out NAME(bfd_elf,swap_symbol_out) | |
96 | #define elf_swap_phdr_in NAME(bfd_elf,swap_phdr_in) | |
97 | #define elf_swap_phdr_out NAME(bfd_elf,swap_phdr_out) | |
98 | #define elf_swap_dyn_in NAME(bfd_elf,swap_dyn_in) | |
99 | #define elf_swap_dyn_out NAME(bfd_elf,swap_dyn_out) | |
100 | #define elf_get_reloc_upper_bound NAME(bfd_elf,get_reloc_upper_bound) | |
101 | #define elf_canonicalize_reloc NAME(bfd_elf,canonicalize_reloc) | |
102 | #define elf_slurp_symbol_table NAME(bfd_elf,slurp_symbol_table) | |
103 | #define elf_get_symtab NAME(bfd_elf,get_symtab) | |
104 | #define elf_canonicalize_dynamic_symtab \ | |
105 | NAME(bfd_elf,canonicalize_dynamic_symtab) | |
106 | #define elf_make_empty_symbol NAME(bfd_elf,make_empty_symbol) | |
107 | #define elf_get_symbol_info NAME(bfd_elf,get_symbol_info) | |
108 | #define elf_get_lineno NAME(bfd_elf,get_lineno) | |
109 | #define elf_set_arch_mach NAME(bfd_elf,set_arch_mach) | |
110 | #define elf_find_nearest_line NAME(bfd_elf,find_nearest_line) | |
111 | #define elf_sizeof_headers NAME(bfd_elf,sizeof_headers) | |
112 | #define elf_set_section_contents NAME(bfd_elf,set_section_contents) | |
113 | #define elf_no_info_to_howto NAME(bfd_elf,no_info_to_howto) | |
114 | #define elf_no_info_to_howto_rel NAME(bfd_elf,no_info_to_howto_rel) | |
115 | #define elf_find_section NAME(bfd_elf,find_section) | |
116 | #define elf_bfd_link_add_symbols NAME(bfd_elf,bfd_link_add_symbols) | |
117 | #define elf_add_dynamic_entry NAME(bfd_elf,add_dynamic_entry) | |
118 | #define elf_write_shdrs_and_ehdr NAME(bfd_elf,write_shdrs_and_ehdr) | |
119 | #define elf_write_out_phdrs NAME(bfd_elf,write_out_phdrs) | |
120 | #define elf_link_create_dynamic_sections \ | |
121 | NAME(bfd_elf,link_create_dynamic_sections) | |
122 | #define elf_link_record_dynamic_symbol _bfd_elf_link_record_dynamic_symbol | |
123 | #define elf_bfd_final_link NAME(bfd_elf,bfd_final_link) | |
124 | #define elf_create_pointer_linker_section NAME(bfd_elf,create_pointer_linker_section) | |
125 | #define elf_finish_pointer_linker_section NAME(bfd_elf,finish_pointer_linker_section) | |
126 | #define elf_gc_sections NAME(_bfd_elf,gc_sections) | |
127 | #define elf_gc_common_finalize_got_offsets \ | |
128 | NAME(_bfd_elf,gc_common_finalize_got_offsets) | |
129 | #define elf_gc_common_final_link NAME(_bfd_elf,gc_common_final_link) | |
130 | #define elf_gc_record_vtinherit NAME(_bfd_elf,gc_record_vtinherit) | |
131 | #define elf_gc_record_vtentry NAME(_bfd_elf,gc_record_vtentry) | |
132 | ||
133 | #if ARCH_SIZE == 64 | |
134 | #define ELF_R_INFO(X,Y) ELF64_R_INFO(X,Y) | |
135 | #define ELF_R_SYM(X) ELF64_R_SYM(X) | |
136 | #define ELF_R_TYPE(X) ELF64_R_TYPE(X) | |
137 | #define ELFCLASS ELFCLASS64 | |
138 | #define FILE_ALIGN 8 | |
139 | #define LOG_FILE_ALIGN 3 | |
140 | #endif | |
141 | #if ARCH_SIZE == 32 | |
142 | #define ELF_R_INFO(X,Y) ELF32_R_INFO(X,Y) | |
143 | #define ELF_R_SYM(X) ELF32_R_SYM(X) | |
144 | #define ELF_R_TYPE(X) ELF32_R_TYPE(X) | |
145 | #define ELFCLASS ELFCLASS32 | |
146 | #define FILE_ALIGN 4 | |
147 | #define LOG_FILE_ALIGN 2 | |
148 | #endif | |
149 | ||
150 | /* Static functions */ | |
151 | ||
152 | static void elf_swap_ehdr_in | |
153 | PARAMS ((bfd *, const Elf_External_Ehdr *, Elf_Internal_Ehdr *)); | |
154 | static void elf_swap_ehdr_out | |
155 | PARAMS ((bfd *, const Elf_Internal_Ehdr *, Elf_External_Ehdr *)); | |
156 | static void elf_swap_shdr_in | |
157 | PARAMS ((bfd *, const Elf_External_Shdr *, Elf_Internal_Shdr *)); | |
158 | static void elf_swap_shdr_out | |
159 | PARAMS ((bfd *, const Elf_Internal_Shdr *, Elf_External_Shdr *)); | |
160 | ||
161 | #define elf_stringtab_init _bfd_elf_stringtab_init | |
162 | ||
163 | #define section_from_elf_index bfd_section_from_elf_index | |
164 | ||
165 | static boolean elf_slurp_reloc_table | |
166 | PARAMS ((bfd *, asection *, asymbol **, boolean)); | |
167 | ||
168 | static void write_relocs PARAMS ((bfd *, asection *, PTR)); | |
169 | ||
170 | static boolean elf_file_p PARAMS ((Elf_External_Ehdr *)); | |
171 | ||
172 | #ifdef DEBUG | |
173 | static void elf_debug_section PARAMS ((int, Elf_Internal_Shdr *)); | |
174 | static void elf_debug_file PARAMS ((Elf_Internal_Ehdr *)); | |
175 | static char *elf_symbol_flags PARAMS ((flagword)); | |
176 | #endif | |
177 | \f | |
178 | /* Structure swapping routines */ | |
179 | ||
180 | /* Should perhaps use put_offset, put_word, etc. For now, the two versions | |
181 | can be handled by explicitly specifying 32 bits or "the long type". */ | |
182 | #if ARCH_SIZE == 64 | |
183 | #define put_word bfd_h_put_64 | |
184 | #define put_signed_word bfd_h_put_signed_64 | |
185 | #define get_word bfd_h_get_64 | |
186 | #define get_signed_word bfd_h_get_signed_64 | |
187 | #endif | |
188 | #if ARCH_SIZE == 32 | |
189 | #define put_word bfd_h_put_32 | |
190 | #define put_signed_word bfd_h_put_signed_32 | |
191 | #define get_word bfd_h_get_32 | |
192 | #define get_signed_word bfd_h_get_signed_32 | |
193 | #endif | |
194 | ||
195 | /* Translate an ELF symbol in external format into an ELF symbol in internal | |
196 | format. */ | |
197 | ||
198 | void | |
199 | elf_swap_symbol_in (abfd, src, dst) | |
200 | bfd *abfd; | |
201 | const Elf_External_Sym *src; | |
202 | Elf_Internal_Sym *dst; | |
203 | { | |
204 | dst->st_name = bfd_h_get_32 (abfd, (bfd_byte *) src->st_name); | |
205 | dst->st_value = get_word (abfd, (bfd_byte *) src->st_value); | |
206 | dst->st_size = get_word (abfd, (bfd_byte *) src->st_size); | |
207 | dst->st_info = bfd_h_get_8 (abfd, (bfd_byte *) src->st_info); | |
208 | dst->st_other = bfd_h_get_8 (abfd, (bfd_byte *) src->st_other); | |
209 | dst->st_shndx = bfd_h_get_16 (abfd, (bfd_byte *) src->st_shndx); | |
210 | } | |
211 | ||
212 | /* Translate an ELF symbol in internal format into an ELF symbol in external | |
213 | format. */ | |
214 | ||
215 | void | |
216 | elf_swap_symbol_out (abfd, src, cdst) | |
217 | bfd *abfd; | |
218 | const Elf_Internal_Sym *src; | |
219 | PTR cdst; | |
220 | { | |
221 | Elf_External_Sym *dst = (Elf_External_Sym *) cdst; | |
222 | bfd_h_put_32 (abfd, src->st_name, dst->st_name); | |
223 | put_word (abfd, src->st_value, dst->st_value); | |
224 | put_word (abfd, src->st_size, dst->st_size); | |
225 | bfd_h_put_8 (abfd, src->st_info, dst->st_info); | |
226 | bfd_h_put_8 (abfd, src->st_other, dst->st_other); | |
227 | bfd_h_put_16 (abfd, src->st_shndx, dst->st_shndx); | |
228 | } | |
229 | ||
230 | ||
231 | /* Translate an ELF file header in external format into an ELF file header in | |
232 | internal format. */ | |
233 | ||
234 | static void | |
235 | elf_swap_ehdr_in (abfd, src, dst) | |
236 | bfd *abfd; | |
237 | const Elf_External_Ehdr *src; | |
238 | Elf_Internal_Ehdr *dst; | |
239 | { | |
240 | memcpy (dst->e_ident, src->e_ident, EI_NIDENT); | |
241 | dst->e_type = bfd_h_get_16 (abfd, (bfd_byte *) src->e_type); | |
242 | dst->e_machine = bfd_h_get_16 (abfd, (bfd_byte *) src->e_machine); | |
243 | dst->e_version = bfd_h_get_32 (abfd, (bfd_byte *) src->e_version); | |
244 | dst->e_entry = get_word (abfd, (bfd_byte *) src->e_entry); | |
245 | dst->e_phoff = get_word (abfd, (bfd_byte *) src->e_phoff); | |
246 | dst->e_shoff = get_word (abfd, (bfd_byte *) src->e_shoff); | |
247 | dst->e_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->e_flags); | |
248 | dst->e_ehsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_ehsize); | |
249 | dst->e_phentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phentsize); | |
250 | dst->e_phnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_phnum); | |
251 | dst->e_shentsize = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shentsize); | |
252 | dst->e_shnum = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shnum); | |
253 | dst->e_shstrndx = bfd_h_get_16 (abfd, (bfd_byte *) src->e_shstrndx); | |
254 | } | |
255 | ||
256 | /* Translate an ELF file header in internal format into an ELF file header in | |
257 | external format. */ | |
258 | ||
259 | static void | |
260 | elf_swap_ehdr_out (abfd, src, dst) | |
261 | bfd *abfd; | |
262 | const Elf_Internal_Ehdr *src; | |
263 | Elf_External_Ehdr *dst; | |
264 | { | |
265 | memcpy (dst->e_ident, src->e_ident, EI_NIDENT); | |
266 | /* note that all elements of dst are *arrays of unsigned char* already... */ | |
267 | bfd_h_put_16 (abfd, src->e_type, dst->e_type); | |
268 | bfd_h_put_16 (abfd, src->e_machine, dst->e_machine); | |
269 | bfd_h_put_32 (abfd, src->e_version, dst->e_version); | |
270 | put_word (abfd, src->e_entry, dst->e_entry); | |
271 | put_word (abfd, src->e_phoff, dst->e_phoff); | |
272 | put_word (abfd, src->e_shoff, dst->e_shoff); | |
273 | bfd_h_put_32 (abfd, src->e_flags, dst->e_flags); | |
274 | bfd_h_put_16 (abfd, src->e_ehsize, dst->e_ehsize); | |
275 | bfd_h_put_16 (abfd, src->e_phentsize, dst->e_phentsize); | |
276 | bfd_h_put_16 (abfd, src->e_phnum, dst->e_phnum); | |
277 | bfd_h_put_16 (abfd, src->e_shentsize, dst->e_shentsize); | |
278 | bfd_h_put_16 (abfd, src->e_shnum, dst->e_shnum); | |
279 | bfd_h_put_16 (abfd, src->e_shstrndx, dst->e_shstrndx); | |
280 | } | |
281 | ||
282 | ||
283 | /* Translate an ELF section header table entry in external format into an | |
284 | ELF section header table entry in internal format. */ | |
285 | ||
286 | static void | |
287 | elf_swap_shdr_in (abfd, src, dst) | |
288 | bfd *abfd; | |
289 | const Elf_External_Shdr *src; | |
290 | Elf_Internal_Shdr *dst; | |
291 | { | |
292 | dst->sh_name = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_name); | |
293 | dst->sh_type = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_type); | |
294 | dst->sh_flags = get_word (abfd, (bfd_byte *) src->sh_flags); | |
295 | dst->sh_addr = get_word (abfd, (bfd_byte *) src->sh_addr); | |
296 | dst->sh_offset = get_word (abfd, (bfd_byte *) src->sh_offset); | |
297 | dst->sh_size = get_word (abfd, (bfd_byte *) src->sh_size); | |
298 | dst->sh_link = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_link); | |
299 | dst->sh_info = bfd_h_get_32 (abfd, (bfd_byte *) src->sh_info); | |
300 | dst->sh_addralign = get_word (abfd, (bfd_byte *) src->sh_addralign); | |
301 | dst->sh_entsize = get_word (abfd, (bfd_byte *) src->sh_entsize); | |
302 | dst->bfd_section = NULL; | |
303 | dst->contents = NULL; | |
304 | } | |
305 | ||
306 | /* Translate an ELF section header table entry in internal format into an | |
307 | ELF section header table entry in external format. */ | |
308 | ||
309 | static void | |
310 | elf_swap_shdr_out (abfd, src, dst) | |
311 | bfd *abfd; | |
312 | const Elf_Internal_Shdr *src; | |
313 | Elf_External_Shdr *dst; | |
314 | { | |
315 | /* note that all elements of dst are *arrays of unsigned char* already... */ | |
316 | bfd_h_put_32 (abfd, src->sh_name, dst->sh_name); | |
317 | bfd_h_put_32 (abfd, src->sh_type, dst->sh_type); | |
318 | put_word (abfd, src->sh_flags, dst->sh_flags); | |
319 | put_word (abfd, src->sh_addr, dst->sh_addr); | |
320 | put_word (abfd, src->sh_offset, dst->sh_offset); | |
321 | put_word (abfd, src->sh_size, dst->sh_size); | |
322 | bfd_h_put_32 (abfd, src->sh_link, dst->sh_link); | |
323 | bfd_h_put_32 (abfd, src->sh_info, dst->sh_info); | |
324 | put_word (abfd, src->sh_addralign, dst->sh_addralign); | |
325 | put_word (abfd, src->sh_entsize, dst->sh_entsize); | |
326 | } | |
327 | ||
328 | ||
329 | /* Translate an ELF program header table entry in external format into an | |
330 | ELF program header table entry in internal format. */ | |
331 | ||
332 | void | |
333 | elf_swap_phdr_in (abfd, src, dst) | |
334 | bfd *abfd; | |
335 | const Elf_External_Phdr *src; | |
336 | Elf_Internal_Phdr *dst; | |
337 | { | |
338 | dst->p_type = bfd_h_get_32 (abfd, (bfd_byte *) src->p_type); | |
339 | dst->p_flags = bfd_h_get_32 (abfd, (bfd_byte *) src->p_flags); | |
340 | dst->p_offset = get_word (abfd, (bfd_byte *) src->p_offset); | |
341 | dst->p_vaddr = get_word (abfd, (bfd_byte *) src->p_vaddr); | |
342 | dst->p_paddr = get_word (abfd, (bfd_byte *) src->p_paddr); | |
343 | dst->p_filesz = get_word (abfd, (bfd_byte *) src->p_filesz); | |
344 | dst->p_memsz = get_word (abfd, (bfd_byte *) src->p_memsz); | |
345 | dst->p_align = get_word (abfd, (bfd_byte *) src->p_align); | |
346 | } | |
347 | ||
348 | void | |
349 | elf_swap_phdr_out (abfd, src, dst) | |
350 | bfd *abfd; | |
351 | const Elf_Internal_Phdr *src; | |
352 | Elf_External_Phdr *dst; | |
353 | { | |
354 | /* note that all elements of dst are *arrays of unsigned char* already... */ | |
355 | bfd_h_put_32 (abfd, src->p_type, dst->p_type); | |
356 | put_word (abfd, src->p_offset, dst->p_offset); | |
357 | put_word (abfd, src->p_vaddr, dst->p_vaddr); | |
358 | put_word (abfd, src->p_paddr, dst->p_paddr); | |
359 | put_word (abfd, src->p_filesz, dst->p_filesz); | |
360 | put_word (abfd, src->p_memsz, dst->p_memsz); | |
361 | bfd_h_put_32 (abfd, src->p_flags, dst->p_flags); | |
362 | put_word (abfd, src->p_align, dst->p_align); | |
363 | } | |
364 | ||
365 | /* Translate an ELF reloc from external format to internal format. */ | |
366 | INLINE void | |
367 | elf_swap_reloc_in (abfd, src, dst) | |
368 | bfd *abfd; | |
369 | const Elf_External_Rel *src; | |
370 | Elf_Internal_Rel *dst; | |
371 | { | |
372 | dst->r_offset = get_word (abfd, (bfd_byte *) src->r_offset); | |
373 | dst->r_info = get_word (abfd, (bfd_byte *) src->r_info); | |
374 | } | |
375 | ||
376 | INLINE void | |
377 | elf_swap_reloca_in (abfd, src, dst) | |
378 | bfd *abfd; | |
379 | const Elf_External_Rela *src; | |
380 | Elf_Internal_Rela *dst; | |
381 | { | |
382 | dst->r_offset = get_word (abfd, (bfd_byte *) src->r_offset); | |
383 | dst->r_info = get_word (abfd, (bfd_byte *) src->r_info); | |
384 | dst->r_addend = get_signed_word (abfd, (bfd_byte *) src->r_addend); | |
385 | } | |
386 | ||
387 | /* Translate an ELF reloc from internal format to external format. */ | |
388 | INLINE void | |
389 | elf_swap_reloc_out (abfd, src, dst) | |
390 | bfd *abfd; | |
391 | const Elf_Internal_Rel *src; | |
392 | Elf_External_Rel *dst; | |
393 | { | |
394 | put_word (abfd, src->r_offset, dst->r_offset); | |
395 | put_word (abfd, src->r_info, dst->r_info); | |
396 | } | |
397 | ||
398 | INLINE void | |
399 | elf_swap_reloca_out (abfd, src, dst) | |
400 | bfd *abfd; | |
401 | const Elf_Internal_Rela *src; | |
402 | Elf_External_Rela *dst; | |
403 | { | |
404 | put_word (abfd, src->r_offset, dst->r_offset); | |
405 | put_word (abfd, src->r_info, dst->r_info); | |
406 | put_signed_word (abfd, src->r_addend, dst->r_addend); | |
407 | } | |
408 | ||
409 | INLINE void | |
410 | elf_swap_dyn_in (abfd, p, dst) | |
411 | bfd *abfd; | |
412 | const PTR p; | |
413 | Elf_Internal_Dyn *dst; | |
414 | { | |
415 | const Elf_External_Dyn *src = (const Elf_External_Dyn *) p; | |
416 | ||
417 | dst->d_tag = get_word (abfd, src->d_tag); | |
418 | dst->d_un.d_val = get_word (abfd, src->d_un.d_val); | |
419 | } | |
420 | ||
421 | INLINE void | |
422 | elf_swap_dyn_out (abfd, src, dst) | |
423 | bfd *abfd; | |
424 | const Elf_Internal_Dyn *src; | |
425 | Elf_External_Dyn *dst; | |
426 | { | |
427 | put_word (abfd, src->d_tag, dst->d_tag); | |
428 | put_word (abfd, src->d_un.d_val, dst->d_un.d_val); | |
429 | } | |
430 | \f | |
431 | /* ELF .o/exec file reading */ | |
432 | ||
433 | ||
434 | /* Begin processing a given object. | |
435 | ||
436 | First we validate the file by reading in the ELF header and checking | |
437 | the magic number. */ | |
438 | ||
439 | static INLINE boolean | |
440 | elf_file_p (x_ehdrp) | |
441 | Elf_External_Ehdr *x_ehdrp; | |
442 | { | |
443 | return ((x_ehdrp->e_ident[EI_MAG0] == ELFMAG0) | |
444 | && (x_ehdrp->e_ident[EI_MAG1] == ELFMAG1) | |
445 | && (x_ehdrp->e_ident[EI_MAG2] == ELFMAG2) | |
446 | && (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3)); | |
447 | } | |
448 | ||
449 | /* Check to see if the file associated with ABFD matches the target vector | |
450 | that ABFD points to. | |
451 | ||
452 | Note that we may be called several times with the same ABFD, but different | |
453 | target vectors, most of which will not match. We have to avoid leaving | |
454 | any side effects in ABFD, or any data it points to (like tdata), if the | |
455 | file does not match the target vector. */ | |
456 | ||
457 | const bfd_target * | |
458 | elf_object_p (abfd) | |
459 | bfd *abfd; | |
460 | { | |
461 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ | |
462 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ | |
463 | Elf_External_Shdr x_shdr; /* Section header table entry, external form */ | |
464 | Elf_Internal_Shdr *i_shdrp = NULL; /* Section header table, internal form */ | |
465 | unsigned int shindex; | |
466 | char *shstrtab; /* Internal copy of section header stringtab */ | |
467 | struct elf_backend_data *ebd; | |
468 | struct elf_obj_tdata *preserved_tdata = elf_tdata (abfd); | |
469 | struct elf_obj_tdata *new_tdata = NULL; | |
470 | asection *s; | |
471 | ||
472 | /* Read in the ELF header in external format. */ | |
473 | ||
474 | if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr)) | |
475 | { | |
476 | if (bfd_get_error () != bfd_error_system_call) | |
477 | goto got_wrong_format_error; | |
478 | else | |
479 | goto got_no_match; | |
480 | } | |
481 | ||
482 | /* Now check to see if we have a valid ELF file, and one that BFD can | |
483 | make use of. The magic number must match, the address size ('class') | |
484 | and byte-swapping must match our XVEC entry, and it must have a | |
485 | section header table (FIXME: See comments re sections at top of this | |
486 | file). */ | |
487 | ||
488 | if ((elf_file_p (&x_ehdr) == false) || | |
489 | (x_ehdr.e_ident[EI_VERSION] != EV_CURRENT) || | |
490 | (x_ehdr.e_ident[EI_CLASS] != ELFCLASS)) | |
491 | goto got_wrong_format_error; | |
492 | ||
493 | /* Check that file's byte order matches xvec's */ | |
494 | switch (x_ehdr.e_ident[EI_DATA]) | |
495 | { | |
496 | case ELFDATA2MSB: /* Big-endian */ | |
497 | if (! bfd_header_big_endian (abfd)) | |
498 | goto got_wrong_format_error; | |
499 | break; | |
500 | case ELFDATA2LSB: /* Little-endian */ | |
501 | if (! bfd_header_little_endian (abfd)) | |
502 | goto got_wrong_format_error; | |
503 | break; | |
504 | case ELFDATANONE: /* No data encoding specified */ | |
505 | default: /* Unknown data encoding specified */ | |
506 | goto got_wrong_format_error; | |
507 | } | |
508 | ||
509 | /* Allocate an instance of the elf_obj_tdata structure and hook it up to | |
510 | the tdata pointer in the bfd. */ | |
511 | ||
512 | new_tdata = ((struct elf_obj_tdata *) | |
513 | bfd_zalloc (abfd, sizeof (struct elf_obj_tdata))); | |
514 | if (new_tdata == NULL) | |
515 | goto got_no_match; | |
516 | elf_tdata (abfd) = new_tdata; | |
517 | ||
518 | /* Now that we know the byte order, swap in the rest of the header */ | |
519 | i_ehdrp = elf_elfheader (abfd); | |
520 | elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp); | |
521 | #if DEBUG & 1 | |
522 | elf_debug_file (i_ehdrp); | |
523 | #endif | |
524 | ||
525 | /* Reject ET_CORE (header indicates core file, not object file) */ | |
526 | if (i_ehdrp->e_type == ET_CORE) | |
527 | goto got_wrong_format_error; | |
528 | ||
529 | /* If there is no section header table, we're hosed. */ | |
530 | if (i_ehdrp->e_shoff == 0) | |
531 | goto got_wrong_format_error; | |
532 | ||
533 | /* As a simple sanity check, verify that the what BFD thinks is the | |
534 | size of each section header table entry actually matches the size | |
535 | recorded in the file. */ | |
536 | if (i_ehdrp->e_shentsize != sizeof (x_shdr)) | |
537 | goto got_wrong_format_error; | |
538 | ||
539 | ebd = get_elf_backend_data (abfd); | |
540 | ||
541 | /* Check that the ELF e_machine field matches what this particular | |
542 | BFD format expects. */ | |
543 | if (ebd->elf_machine_code != i_ehdrp->e_machine | |
544 | && (ebd->elf_machine_alt1 == 0 || i_ehdrp->e_machine != ebd->elf_machine_alt1) | |
545 | && (ebd->elf_machine_alt2 == 0 || i_ehdrp->e_machine != ebd->elf_machine_alt2)) | |
546 | { | |
547 | const bfd_target * const *target_ptr; | |
548 | ||
549 | if (ebd->elf_machine_code != EM_NONE) | |
550 | goto got_wrong_format_error; | |
551 | ||
552 | /* This is the generic ELF target. Let it match any ELF target | |
553 | for which we do not have a specific backend. */ | |
554 | for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++) | |
555 | { | |
556 | struct elf_backend_data *back; | |
557 | ||
558 | if ((*target_ptr)->flavour != bfd_target_elf_flavour) | |
559 | continue; | |
560 | back = (struct elf_backend_data *) (*target_ptr)->backend_data; | |
561 | if (back->elf_machine_code == i_ehdrp->e_machine | |
562 | || (back->elf_machine_alt1 != 0 | |
563 | && back->elf_machine_alt1 == i_ehdrp->e_machine) | |
564 | || (back->elf_machine_alt2 != 0 | |
565 | && back->elf_machine_alt2 == i_ehdrp->e_machine)) | |
566 | { | |
567 | /* target_ptr is an ELF backend which matches this | |
568 | object file, so reject the generic ELF target. */ | |
569 | goto got_wrong_format_error; | |
570 | } | |
571 | } | |
572 | } | |
573 | ||
574 | if (i_ehdrp->e_type == ET_EXEC) | |
575 | abfd->flags |= EXEC_P; | |
576 | else if (i_ehdrp->e_type == ET_DYN) | |
577 | abfd->flags |= DYNAMIC; | |
578 | ||
579 | if (i_ehdrp->e_phnum > 0) | |
580 | abfd->flags |= D_PAGED; | |
581 | ||
582 | if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0)) | |
583 | { | |
584 | /* It's OK if this fails for the generic target. */ | |
585 | if (ebd->elf_machine_code != EM_NONE) | |
586 | goto got_no_match; | |
587 | } | |
588 | ||
589 | /* Remember the entry point specified in the ELF file header. */ | |
590 | bfd_get_start_address (abfd) = i_ehdrp->e_entry; | |
591 | ||
592 | /* Allocate space for a copy of the section header table in | |
593 | internal form, seek to the section header table in the file, | |
594 | read it in, and convert it to internal form. */ | |
595 | i_shdrp = ((Elf_Internal_Shdr *) | |
596 | bfd_alloc (abfd, sizeof (*i_shdrp) * i_ehdrp->e_shnum)); | |
597 | elf_elfsections (abfd) = ((Elf_Internal_Shdr **) | |
598 | bfd_alloc (abfd, | |
599 | sizeof (i_shdrp) * i_ehdrp->e_shnum)); | |
600 | if (!i_shdrp || !elf_elfsections (abfd)) | |
601 | goto got_no_match; | |
602 | if (bfd_seek (abfd, i_ehdrp->e_shoff, SEEK_SET) != 0) | |
603 | goto got_no_match; | |
604 | for (shindex = 0; shindex < i_ehdrp->e_shnum; shindex++) | |
605 | { | |
606 | if (bfd_read ((PTR) & x_shdr, sizeof x_shdr, 1, abfd) != sizeof (x_shdr)) | |
607 | goto got_no_match; | |
608 | elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex); | |
609 | elf_elfsections (abfd)[shindex] = i_shdrp + shindex; | |
610 | ||
611 | /* If the section is loaded, but not page aligned, clear | |
612 | D_PAGED. */ | |
613 | if ((i_shdrp[shindex].sh_flags & SHF_ALLOC) != 0 | |
614 | && i_shdrp[shindex].sh_type != SHT_NOBITS | |
615 | && (((i_shdrp[shindex].sh_addr - i_shdrp[shindex].sh_offset) | |
616 | % ebd->maxpagesize) | |
617 | != 0)) | |
618 | abfd->flags &= ~D_PAGED; | |
619 | } | |
620 | if (i_ehdrp->e_shstrndx) | |
621 | { | |
622 | if (! bfd_section_from_shdr (abfd, i_ehdrp->e_shstrndx)) | |
623 | goto got_no_match; | |
624 | } | |
625 | ||
626 | /* Read in the program headers. */ | |
627 | if (i_ehdrp->e_phnum == 0) | |
628 | elf_tdata (abfd)->phdr = NULL; | |
629 | else | |
630 | { | |
631 | Elf_Internal_Phdr *i_phdr; | |
632 | unsigned int i; | |
633 | ||
634 | elf_tdata (abfd)->phdr = ((Elf_Internal_Phdr *) | |
635 | bfd_alloc (abfd, | |
636 | (i_ehdrp->e_phnum | |
637 | * sizeof (Elf_Internal_Phdr)))); | |
638 | if (elf_tdata (abfd)->phdr == NULL) | |
639 | goto got_no_match; | |
640 | if (bfd_seek (abfd, i_ehdrp->e_phoff, SEEK_SET) != 0) | |
641 | goto got_no_match; | |
642 | i_phdr = elf_tdata (abfd)->phdr; | |
643 | for (i = 0; i < i_ehdrp->e_phnum; i++, i_phdr++) | |
644 | { | |
645 | Elf_External_Phdr x_phdr; | |
646 | ||
647 | if (bfd_read ((PTR) &x_phdr, sizeof x_phdr, 1, abfd) | |
648 | != sizeof x_phdr) | |
649 | goto got_no_match; | |
650 | elf_swap_phdr_in (abfd, &x_phdr, i_phdr); | |
651 | } | |
652 | } | |
653 | ||
654 | /* Read in the string table containing the names of the sections. We | |
655 | will need the base pointer to this table later. */ | |
656 | /* We read this inline now, so that we don't have to go through | |
657 | bfd_section_from_shdr with it (since this particular strtab is | |
658 | used to find all of the ELF section names.) */ | |
659 | ||
660 | shstrtab = bfd_elf_get_str_section (abfd, i_ehdrp->e_shstrndx); | |
661 | if (!shstrtab) | |
662 | goto got_no_match; | |
663 | ||
664 | /* Once all of the section headers have been read and converted, we | |
665 | can start processing them. Note that the first section header is | |
666 | a dummy placeholder entry, so we ignore it. */ | |
667 | ||
668 | for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++) | |
669 | { | |
670 | if (! bfd_section_from_shdr (abfd, shindex)) | |
671 | goto got_no_match; | |
672 | } | |
673 | ||
674 | /* Let the backend double check the format and override global | |
675 | information. */ | |
676 | if (ebd->elf_backend_object_p) | |
677 | { | |
678 | if ((*ebd->elf_backend_object_p) (abfd) == false) | |
679 | goto got_wrong_format_error; | |
680 | } | |
681 | ||
682 | /* If we have created any reloc sections that are associated with | |
683 | debugging sections, mark the reloc sections as debugging as well. */ | |
684 | for (s = abfd->sections; s != NULL; s = s->next) | |
685 | { | |
686 | if ((elf_section_data (s)->this_hdr.sh_type == SHT_REL | |
687 | || elf_section_data (s)->this_hdr.sh_type == SHT_RELA) | |
688 | && elf_section_data (s)->this_hdr.sh_info > 0) | |
689 | { | |
690 | unsigned long targ_index; | |
691 | asection *targ_sec; | |
692 | ||
693 | targ_index = elf_section_data (s)->this_hdr.sh_info; | |
694 | targ_sec = bfd_section_from_elf_index (abfd, targ_index); | |
695 | if (targ_sec != NULL | |
696 | && (targ_sec->flags & SEC_DEBUGGING) != 0) | |
697 | s->flags |= SEC_DEBUGGING; | |
698 | } | |
699 | } | |
700 | ||
701 | return (abfd->xvec); | |
702 | ||
703 | got_wrong_format_error: | |
704 | bfd_set_error (bfd_error_wrong_format); | |
705 | got_no_match: | |
706 | if (new_tdata != NULL | |
707 | && new_tdata->elf_sect_ptr != NULL) | |
708 | bfd_release (abfd, new_tdata->elf_sect_ptr); | |
709 | if (i_shdrp != NULL) | |
710 | bfd_release (abfd, i_shdrp); | |
711 | if (new_tdata != NULL) | |
712 | bfd_release (abfd, new_tdata); | |
713 | elf_tdata (abfd) = preserved_tdata; | |
714 | return (NULL); | |
715 | } | |
716 | \f | |
717 | /* ELF .o/exec file writing */ | |
718 | ||
719 | /* Write out the relocs. */ | |
720 | ||
721 | static void | |
722 | write_relocs (abfd, sec, data) | |
723 | bfd *abfd; | |
724 | asection *sec; | |
725 | PTR data; | |
726 | { | |
727 | boolean *failedp = (boolean *) data; | |
728 | Elf_Internal_Shdr *rela_hdr; | |
729 | Elf_External_Rela *outbound_relocas; | |
730 | Elf_External_Rel *outbound_relocs; | |
731 | unsigned int idx; | |
732 | int use_rela_p = get_elf_backend_data (abfd)->use_rela_p; | |
733 | asymbol *last_sym = 0; | |
734 | int last_sym_idx = 0; | |
735 | ||
736 | /* If we have already failed, don't do anything. */ | |
737 | if (*failedp) | |
738 | return; | |
739 | ||
740 | if ((sec->flags & SEC_RELOC) == 0) | |
741 | return; | |
742 | ||
743 | /* The linker backend writes the relocs out itself, and sets the | |
744 | reloc_count field to zero to inhibit writing them here. Also, | |
745 | sometimes the SEC_RELOC flag gets set even when there aren't any | |
746 | relocs. */ | |
747 | if (sec->reloc_count == 0) | |
748 | return; | |
749 | ||
750 | rela_hdr = &elf_section_data (sec)->rel_hdr; | |
751 | ||
752 | rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count; | |
753 | rela_hdr->contents = (PTR) bfd_alloc (abfd, rela_hdr->sh_size); | |
754 | if (rela_hdr->contents == NULL) | |
755 | { | |
756 | *failedp = true; | |
757 | return; | |
758 | } | |
759 | ||
760 | /* orelocation has the data, reloc_count has the count... */ | |
761 | if (use_rela_p) | |
762 | { | |
763 | outbound_relocas = (Elf_External_Rela *) rela_hdr->contents; | |
764 | ||
765 | for (idx = 0; idx < sec->reloc_count; idx++) | |
766 | { | |
767 | Elf_Internal_Rela dst_rela; | |
768 | Elf_External_Rela *src_rela; | |
769 | arelent *ptr; | |
770 | asymbol *sym; | |
771 | int n; | |
772 | ||
773 | ptr = sec->orelocation[idx]; | |
774 | src_rela = outbound_relocas + idx; | |
775 | ||
776 | /* The address of an ELF reloc is section relative for an object | |
777 | file, and absolute for an executable file or shared library. | |
778 | The address of a BFD reloc is always section relative. */ | |
779 | if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0) | |
780 | dst_rela.r_offset = ptr->address; | |
781 | else | |
782 | dst_rela.r_offset = ptr->address + sec->vma; | |
783 | ||
784 | sym = *ptr->sym_ptr_ptr; | |
785 | if (sym == last_sym) | |
786 | n = last_sym_idx; | |
787 | else if (bfd_is_abs_section (sym->section) && sym->value == 0) | |
788 | n = STN_UNDEF; | |
789 | else | |
790 | { | |
791 | last_sym = sym; | |
792 | n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym); | |
793 | if (n < 0) | |
794 | { | |
795 | *failedp = true; | |
796 | return; | |
797 | } | |
798 | last_sym_idx = n; | |
799 | } | |
800 | ||
801 | if ((*ptr->sym_ptr_ptr)->the_bfd != NULL | |
802 | && (*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec | |
803 | && ! _bfd_elf_validate_reloc (abfd, ptr)) | |
804 | { | |
805 | *failedp = true; | |
806 | return; | |
807 | } | |
808 | ||
809 | dst_rela.r_info = ELF_R_INFO (n, ptr->howto->type); | |
810 | ||
811 | dst_rela.r_addend = ptr->addend; | |
812 | elf_swap_reloca_out (abfd, &dst_rela, src_rela); | |
813 | } | |
814 | } | |
815 | else | |
816 | /* REL relocations */ | |
817 | { | |
818 | outbound_relocs = (Elf_External_Rel *) rela_hdr->contents; | |
819 | ||
820 | for (idx = 0; idx < sec->reloc_count; idx++) | |
821 | { | |
822 | Elf_Internal_Rel dst_rel; | |
823 | Elf_External_Rel *src_rel; | |
824 | arelent *ptr; | |
825 | int n; | |
826 | asymbol *sym; | |
827 | ||
828 | ptr = sec->orelocation[idx]; | |
829 | sym = *ptr->sym_ptr_ptr; | |
830 | src_rel = outbound_relocs + idx; | |
831 | ||
832 | /* The address of an ELF reloc is section relative for an object | |
833 | file, and absolute for an executable file or shared library. | |
834 | The address of a BFD reloc is always section relative. */ | |
835 | if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0) | |
836 | dst_rel.r_offset = ptr->address; | |
837 | else | |
838 | dst_rel.r_offset = ptr->address + sec->vma; | |
839 | ||
840 | if (sym == last_sym) | |
841 | n = last_sym_idx; | |
842 | else | |
843 | { | |
844 | last_sym = sym; | |
845 | n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym); | |
846 | if (n < 0) | |
847 | { | |
848 | *failedp = true; | |
849 | return; | |
850 | } | |
851 | last_sym_idx = n; | |
852 | } | |
853 | ||
854 | if ((*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec | |
855 | && ! _bfd_elf_validate_reloc (abfd, ptr)) | |
856 | { | |
857 | *failedp = true; | |
858 | return; | |
859 | } | |
860 | ||
861 | dst_rel.r_info = ELF_R_INFO (n, ptr->howto->type); | |
862 | ||
863 | elf_swap_reloc_out (abfd, &dst_rel, src_rel); | |
864 | } | |
865 | } | |
866 | } | |
867 | ||
868 | /* Write out the program headers. */ | |
869 | ||
870 | int | |
871 | elf_write_out_phdrs (abfd, phdr, count) | |
872 | bfd *abfd; | |
873 | const Elf_Internal_Phdr *phdr; | |
874 | int count; | |
875 | { | |
876 | while (count--) | |
877 | { | |
878 | Elf_External_Phdr extphdr; | |
879 | elf_swap_phdr_out (abfd, phdr, &extphdr); | |
880 | if (bfd_write (&extphdr, sizeof (Elf_External_Phdr), 1, abfd) | |
881 | != sizeof (Elf_External_Phdr)) | |
882 | return -1; | |
883 | phdr++; | |
884 | } | |
885 | return 0; | |
886 | } | |
887 | ||
888 | /* Write out the section headers and the ELF file header. */ | |
889 | ||
890 | boolean | |
891 | elf_write_shdrs_and_ehdr (abfd) | |
892 | bfd *abfd; | |
893 | { | |
894 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ | |
895 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ | |
896 | Elf_External_Shdr *x_shdrp; /* Section header table, external form */ | |
897 | Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */ | |
898 | unsigned int count; | |
899 | ||
900 | i_ehdrp = elf_elfheader (abfd); | |
901 | i_shdrp = elf_elfsections (abfd); | |
902 | ||
903 | /* swap the header before spitting it out... */ | |
904 | ||
905 | #if DEBUG & 1 | |
906 | elf_debug_file (i_ehdrp); | |
907 | #endif | |
908 | elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr); | |
909 | if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 | |
910 | || (bfd_write ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) | |
911 | != sizeof (x_ehdr))) | |
912 | return false; | |
913 | ||
914 | /* at this point we've concocted all the ELF sections... */ | |
915 | x_shdrp = (Elf_External_Shdr *) | |
916 | bfd_alloc (abfd, sizeof (*x_shdrp) * (i_ehdrp->e_shnum)); | |
917 | if (!x_shdrp) | |
918 | return false; | |
919 | ||
920 | for (count = 0; count < i_ehdrp->e_shnum; count++) | |
921 | { | |
922 | #if DEBUG & 2 | |
923 | elf_debug_section (count, i_shdrp[count]); | |
924 | #endif | |
925 | elf_swap_shdr_out (abfd, i_shdrp[count], x_shdrp + count); | |
926 | } | |
927 | if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0 | |
928 | || (bfd_write ((PTR) x_shdrp, sizeof (*x_shdrp), i_ehdrp->e_shnum, abfd) | |
929 | != sizeof (*x_shdrp) * i_ehdrp->e_shnum)) | |
930 | return false; | |
931 | ||
932 | /* need to dump the string table too... */ | |
933 | ||
934 | return true; | |
935 | } | |
936 | ||
937 | long | |
938 | elf_slurp_symbol_table (abfd, symptrs, dynamic) | |
939 | bfd *abfd; | |
940 | asymbol **symptrs; /* Buffer for generated bfd symbols */ | |
941 | boolean dynamic; | |
942 | { | |
943 | Elf_Internal_Shdr *hdr; | |
944 | Elf_Internal_Shdr *verhdr; | |
945 | unsigned long symcount; /* Number of external ELF symbols */ | |
946 | elf_symbol_type *sym; /* Pointer to current bfd symbol */ | |
947 | elf_symbol_type *symbase; /* Buffer for generated bfd symbols */ | |
948 | Elf_Internal_Sym i_sym; | |
949 | Elf_External_Sym *x_symp = NULL; | |
950 | Elf_External_Versym *x_versymp = NULL; | |
951 | ||
952 | /* Read each raw ELF symbol, converting from external ELF form to | |
953 | internal ELF form, and then using the information to create a | |
954 | canonical bfd symbol table entry. | |
955 | ||
956 | Note that we allocate the initial bfd canonical symbol buffer | |
957 | based on a one-to-one mapping of the ELF symbols to canonical | |
958 | symbols. We actually use all the ELF symbols, so there will be no | |
959 | space left over at the end. When we have all the symbols, we | |
960 | build the caller's pointer vector. */ | |
961 | ||
962 | if (! dynamic) | |
963 | { | |
964 | hdr = &elf_tdata (abfd)->symtab_hdr; | |
965 | verhdr = NULL; | |
966 | } | |
967 | else | |
968 | { | |
969 | hdr = &elf_tdata (abfd)->dynsymtab_hdr; | |
970 | if (elf_dynversym (abfd) == 0) | |
971 | verhdr = NULL; | |
972 | else | |
973 | verhdr = &elf_tdata (abfd)->dynversym_hdr; | |
974 | if ((elf_tdata (abfd)->dynverdef_section != 0 | |
975 | && elf_tdata (abfd)->verdef == NULL) | |
976 | || (elf_tdata (abfd)->dynverref_section != 0 | |
977 | && elf_tdata (abfd)->verref == NULL)) | |
978 | { | |
979 | if (! _bfd_elf_slurp_version_tables (abfd)) | |
980 | return -1; | |
981 | } | |
982 | } | |
983 | ||
984 | if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1) | |
985 | return -1; | |
986 | ||
987 | symcount = hdr->sh_size / sizeof (Elf_External_Sym); | |
988 | ||
989 | if (symcount == 0) | |
990 | sym = symbase = NULL; | |
991 | else | |
992 | { | |
993 | unsigned long i; | |
994 | ||
995 | if (bfd_seek (abfd, hdr->sh_offset, SEEK_SET) == -1) | |
996 | return -1; | |
997 | ||
998 | symbase = ((elf_symbol_type *) | |
999 | bfd_zalloc (abfd, symcount * sizeof (elf_symbol_type))); | |
1000 | if (symbase == (elf_symbol_type *) NULL) | |
1001 | return -1; | |
1002 | sym = symbase; | |
1003 | ||
1004 | /* Temporarily allocate room for the raw ELF symbols. */ | |
1005 | x_symp = ((Elf_External_Sym *) | |
1006 | bfd_malloc (symcount * sizeof (Elf_External_Sym))); | |
1007 | if (x_symp == NULL && symcount != 0) | |
1008 | goto error_return; | |
1009 | ||
1010 | if (bfd_read ((PTR) x_symp, sizeof (Elf_External_Sym), symcount, abfd) | |
1011 | != symcount * sizeof (Elf_External_Sym)) | |
1012 | goto error_return; | |
1013 | ||
1014 | /* Read the raw ELF version symbol information. */ | |
1015 | ||
1016 | if (verhdr != NULL | |
1017 | && verhdr->sh_size / sizeof (Elf_External_Versym) != symcount) | |
1018 | { | |
1019 | (*_bfd_error_handler) | |
1020 | (_("%s: version count (%ld) does not match symbol count (%ld)"), | |
1021 | abfd->filename, | |
1022 | (long) (verhdr->sh_size / sizeof (Elf_External_Versym)), | |
1023 | symcount); | |
1024 | ||
1025 | /* Slurp in the symbols without the version information, | |
1026 | since that is more helpful than just quitting. */ | |
1027 | verhdr = NULL; | |
1028 | } | |
1029 | ||
1030 | if (verhdr != NULL) | |
1031 | { | |
1032 | if (bfd_seek (abfd, verhdr->sh_offset, SEEK_SET) != 0) | |
1033 | goto error_return; | |
1034 | ||
1035 | x_versymp = (Elf_External_Versym *) bfd_malloc (verhdr->sh_size); | |
1036 | if (x_versymp == NULL && verhdr->sh_size != 0) | |
1037 | goto error_return; | |
1038 | ||
1039 | if (bfd_read ((PTR) x_versymp, 1, verhdr->sh_size, abfd) | |
1040 | != verhdr->sh_size) | |
1041 | goto error_return; | |
1042 | } | |
1043 | ||
1044 | /* Skip first symbol, which is a null dummy. */ | |
1045 | for (i = 1; i < symcount; i++) | |
1046 | { | |
1047 | elf_swap_symbol_in (abfd, x_symp + i, &i_sym); | |
1048 | memcpy (&sym->internal_elf_sym, &i_sym, sizeof (Elf_Internal_Sym)); | |
1049 | #ifdef ELF_KEEP_EXTSYM | |
1050 | memcpy (&sym->native_elf_sym, x_symp + i, sizeof (Elf_External_Sym)); | |
1051 | #endif | |
1052 | sym->symbol.the_bfd = abfd; | |
1053 | ||
1054 | sym->symbol.name = bfd_elf_string_from_elf_section (abfd, | |
1055 | hdr->sh_link, | |
1056 | i_sym.st_name); | |
1057 | ||
1058 | sym->symbol.value = i_sym.st_value; | |
1059 | ||
1060 | if (i_sym.st_shndx > 0 && i_sym.st_shndx < SHN_LORESERVE) | |
1061 | { | |
1062 | sym->symbol.section = section_from_elf_index (abfd, | |
1063 | i_sym.st_shndx); | |
1064 | if (sym->symbol.section == NULL) | |
1065 | { | |
1066 | /* This symbol is in a section for which we did not | |
1067 | create a BFD section. Just use bfd_abs_section, | |
1068 | although it is wrong. FIXME. */ | |
1069 | sym->symbol.section = bfd_abs_section_ptr; | |
1070 | } | |
1071 | } | |
1072 | else if (i_sym.st_shndx == SHN_ABS) | |
1073 | { | |
1074 | sym->symbol.section = bfd_abs_section_ptr; | |
1075 | } | |
1076 | else if (i_sym.st_shndx == SHN_COMMON) | |
1077 | { | |
1078 | sym->symbol.section = bfd_com_section_ptr; | |
1079 | /* Elf puts the alignment into the `value' field, and | |
1080 | the size into the `size' field. BFD wants to see the | |
1081 | size in the value field, and doesn't care (at the | |
1082 | moment) about the alignment. */ | |
1083 | sym->symbol.value = i_sym.st_size; | |
1084 | } | |
1085 | else if (i_sym.st_shndx == SHN_UNDEF) | |
1086 | { | |
1087 | sym->symbol.section = bfd_und_section_ptr; | |
1088 | } | |
1089 | else | |
1090 | sym->symbol.section = bfd_abs_section_ptr; | |
1091 | ||
1092 | /* If this is a relocateable file, then the symbol value is | |
1093 | already section relative. */ | |
1094 | if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0) | |
1095 | sym->symbol.value -= sym->symbol.section->vma; | |
1096 | ||
1097 | switch (ELF_ST_BIND (i_sym.st_info)) | |
1098 | { | |
1099 | case STB_LOCAL: | |
1100 | sym->symbol.flags |= BSF_LOCAL; | |
1101 | break; | |
1102 | case STB_GLOBAL: | |
1103 | if (i_sym.st_shndx != SHN_UNDEF | |
1104 | && i_sym.st_shndx != SHN_COMMON) | |
1105 | sym->symbol.flags |= BSF_GLOBAL; | |
1106 | break; | |
1107 | case STB_WEAK: | |
1108 | sym->symbol.flags |= BSF_WEAK; | |
1109 | break; | |
1110 | } | |
1111 | ||
1112 | switch (ELF_ST_TYPE (i_sym.st_info)) | |
1113 | { | |
1114 | case STT_SECTION: | |
1115 | sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING; | |
1116 | break; | |
1117 | case STT_FILE: | |
1118 | sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING; | |
1119 | break; | |
1120 | case STT_FUNC: | |
1121 | sym->symbol.flags |= BSF_FUNCTION; | |
1122 | break; | |
1123 | case STT_OBJECT: | |
1124 | sym->symbol.flags |= BSF_OBJECT; | |
1125 | break; | |
1126 | } | |
1127 | ||
1128 | if (dynamic) | |
1129 | sym->symbol.flags |= BSF_DYNAMIC; | |
1130 | ||
1131 | if (x_versymp != NULL) | |
1132 | { | |
1133 | Elf_Internal_Versym iversym; | |
1134 | ||
1135 | _bfd_elf_swap_versym_in (abfd, x_versymp + i, &iversym); | |
1136 | sym->version = iversym.vs_vers; | |
1137 | } | |
1138 | ||
1139 | /* Do some backend-specific processing on this symbol. */ | |
1140 | { | |
1141 | struct elf_backend_data *ebd = get_elf_backend_data (abfd); | |
1142 | if (ebd->elf_backend_symbol_processing) | |
1143 | (*ebd->elf_backend_symbol_processing) (abfd, &sym->symbol); | |
1144 | } | |
1145 | ||
1146 | sym++; | |
1147 | } | |
1148 | } | |
1149 | ||
1150 | /* Do some backend-specific processing on this symbol table. */ | |
1151 | { | |
1152 | struct elf_backend_data *ebd = get_elf_backend_data (abfd); | |
1153 | if (ebd->elf_backend_symbol_table_processing) | |
1154 | (*ebd->elf_backend_symbol_table_processing) (abfd, symbase, symcount); | |
1155 | } | |
1156 | ||
1157 | /* We rely on the zalloc to clear out the final symbol entry. */ | |
1158 | ||
1159 | symcount = sym - symbase; | |
1160 | ||
1161 | /* Fill in the user's symbol pointer vector if needed. */ | |
1162 | if (symptrs) | |
1163 | { | |
1164 | long l = symcount; | |
1165 | ||
1166 | sym = symbase; | |
1167 | while (l-- > 0) | |
1168 | { | |
1169 | *symptrs++ = &sym->symbol; | |
1170 | sym++; | |
1171 | } | |
1172 | *symptrs = 0; /* Final null pointer */ | |
1173 | } | |
1174 | ||
1175 | if (x_versymp != NULL) | |
1176 | free (x_versymp); | |
1177 | if (x_symp != NULL) | |
1178 | free (x_symp); | |
1179 | return symcount; | |
1180 | error_return: | |
1181 | if (x_versymp != NULL) | |
1182 | free (x_versymp); | |
1183 | if (x_symp != NULL) | |
1184 | free (x_symp); | |
1185 | return -1; | |
1186 | } | |
1187 | ||
1188 | /* Read in and swap the external relocs. */ | |
1189 | ||
1190 | static boolean | |
1191 | elf_slurp_reloc_table (abfd, asect, symbols, dynamic) | |
1192 | bfd *abfd; | |
1193 | asection *asect; | |
1194 | asymbol **symbols; | |
1195 | boolean dynamic; | |
1196 | { | |
1197 | struct elf_backend_data * const ebd = get_elf_backend_data (abfd); | |
1198 | struct bfd_elf_section_data * const d = elf_section_data (asect); | |
1199 | Elf_Internal_Shdr *rel_hdr; | |
1200 | bfd_size_type reloc_count; | |
1201 | PTR allocated = NULL; | |
1202 | bfd_byte *native_relocs; | |
1203 | arelent *relents; | |
1204 | arelent *relent; | |
1205 | unsigned int i; | |
1206 | int entsize; | |
1207 | ||
1208 | if (asect->relocation != NULL) | |
1209 | return true; | |
1210 | ||
1211 | if (! dynamic) | |
1212 | { | |
1213 | if ((asect->flags & SEC_RELOC) == 0 | |
1214 | || asect->reloc_count == 0) | |
1215 | return true; | |
1216 | ||
1217 | rel_hdr = &d->rel_hdr; | |
1218 | reloc_count = asect->reloc_count; | |
1219 | ||
1220 | BFD_ASSERT (asect->rel_filepos == rel_hdr->sh_offset | |
1221 | && reloc_count == rel_hdr->sh_size / rel_hdr->sh_entsize); | |
1222 | } | |
1223 | else | |
1224 | { | |
1225 | if (asect->_raw_size == 0) | |
1226 | return true; | |
1227 | ||
1228 | rel_hdr = &d->this_hdr; | |
1229 | reloc_count = rel_hdr->sh_size / rel_hdr->sh_entsize; | |
1230 | } | |
1231 | ||
1232 | allocated = (PTR) bfd_malloc ((size_t) rel_hdr->sh_size); | |
1233 | if (allocated == NULL) | |
1234 | goto error_return; | |
1235 | ||
1236 | if (bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0 | |
1237 | || (bfd_read (allocated, 1, rel_hdr->sh_size, abfd) | |
1238 | != rel_hdr->sh_size)) | |
1239 | goto error_return; | |
1240 | ||
1241 | native_relocs = (bfd_byte *) allocated; | |
1242 | ||
1243 | relents = (arelent *) bfd_alloc (abfd, reloc_count * sizeof (arelent)); | |
1244 | if (relents == NULL) | |
1245 | goto error_return; | |
1246 | ||
1247 | entsize = rel_hdr->sh_entsize; | |
1248 | BFD_ASSERT (entsize == sizeof (Elf_External_Rel) | |
1249 | || entsize == sizeof (Elf_External_Rela)); | |
1250 | ||
1251 | for (i = 0, relent = relents; | |
1252 | i < reloc_count; | |
1253 | i++, relent++, native_relocs += entsize) | |
1254 | { | |
1255 | Elf_Internal_Rela rela; | |
1256 | Elf_Internal_Rel rel; | |
1257 | ||
1258 | if (entsize == sizeof (Elf_External_Rela)) | |
1259 | elf_swap_reloca_in (abfd, (Elf_External_Rela *) native_relocs, &rela); | |
1260 | else | |
1261 | { | |
1262 | elf_swap_reloc_in (abfd, (Elf_External_Rel *) native_relocs, &rel); | |
1263 | rela.r_offset = rel.r_offset; | |
1264 | rela.r_info = rel.r_info; | |
1265 | rela.r_addend = 0; | |
1266 | } | |
1267 | ||
1268 | /* The address of an ELF reloc is section relative for an object | |
1269 | file, and absolute for an executable file or shared library. | |
1270 | The address of a normal BFD reloc is always section relative, | |
1271 | and the address of a dynamic reloc is absolute.. */ | |
1272 | if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0 || dynamic) | |
1273 | relent->address = rela.r_offset; | |
1274 | else | |
1275 | relent->address = rela.r_offset - asect->vma; | |
1276 | ||
1277 | if (ELF_R_SYM (rela.r_info) == 0) | |
1278 | relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; | |
1279 | else | |
1280 | { | |
1281 | asymbol **ps, *s; | |
1282 | ||
1283 | ps = symbols + ELF_R_SYM (rela.r_info) - 1; | |
1284 | s = *ps; | |
1285 | ||
1286 | /* Canonicalize ELF section symbols. FIXME: Why? */ | |
1287 | if ((s->flags & BSF_SECTION_SYM) == 0) | |
1288 | relent->sym_ptr_ptr = ps; | |
1289 | else | |
1290 | relent->sym_ptr_ptr = s->section->symbol_ptr_ptr; | |
1291 | } | |
1292 | ||
1293 | relent->addend = rela.r_addend; | |
1294 | ||
1295 | if (entsize == sizeof (Elf_External_Rela)) | |
1296 | (*ebd->elf_info_to_howto) (abfd, relent, &rela); | |
1297 | else | |
1298 | (*ebd->elf_info_to_howto_rel) (abfd, relent, &rel); | |
1299 | } | |
1300 | ||
1301 | asect->relocation = relents; | |
1302 | ||
1303 | if (allocated != NULL) | |
1304 | free (allocated); | |
1305 | ||
1306 | return true; | |
1307 | ||
1308 | error_return: | |
1309 | if (allocated != NULL) | |
1310 | free (allocated); | |
1311 | return false; | |
1312 | } | |
1313 | ||
1314 | #ifdef DEBUG | |
1315 | static void | |
1316 | elf_debug_section (num, hdr) | |
1317 | int num; | |
1318 | Elf_Internal_Shdr *hdr; | |
1319 | { | |
1320 | fprintf (stderr, "\nSection#%d '%s' 0x%.8lx\n", num, | |
1321 | hdr->bfd_section != NULL ? hdr->bfd_section->name : "", | |
1322 | (long) hdr); | |
1323 | fprintf (stderr, | |
1324 | "sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n", | |
1325 | (long) hdr->sh_name, | |
1326 | (long) hdr->sh_type, | |
1327 | (long) hdr->sh_flags); | |
1328 | fprintf (stderr, | |
1329 | "sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n", | |
1330 | (long) hdr->sh_addr, | |
1331 | (long) hdr->sh_offset, | |
1332 | (long) hdr->sh_size); | |
1333 | fprintf (stderr, | |
1334 | "sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n", | |
1335 | (long) hdr->sh_link, | |
1336 | (long) hdr->sh_info, | |
1337 | (long) hdr->sh_addralign); | |
1338 | fprintf (stderr, "sh_entsize = %ld\n", | |
1339 | (long) hdr->sh_entsize); | |
1340 | fflush (stderr); | |
1341 | } | |
1342 | ||
1343 | static void | |
1344 | elf_debug_file (ehdrp) | |
1345 | Elf_Internal_Ehdr *ehdrp; | |
1346 | { | |
1347 | fprintf (stderr, "e_entry = 0x%.8lx\n", (long) ehdrp->e_entry); | |
1348 | fprintf (stderr, "e_phoff = %ld\n", (long) ehdrp->e_phoff); | |
1349 | fprintf (stderr, "e_phnum = %ld\n", (long) ehdrp->e_phnum); | |
1350 | fprintf (stderr, "e_phentsize = %ld\n", (long) ehdrp->e_phentsize); | |
1351 | fprintf (stderr, "e_shoff = %ld\n", (long) ehdrp->e_shoff); | |
1352 | fprintf (stderr, "e_shnum = %ld\n", (long) ehdrp->e_shnum); | |
1353 | fprintf (stderr, "e_shentsize = %ld\n", (long) ehdrp->e_shentsize); | |
1354 | } | |
1355 | ||
1356 | static char * | |
1357 | elf_symbol_flags (flags) | |
1358 | flagword flags; | |
1359 | { | |
1360 | static char buffer[1024]; | |
1361 | ||
1362 | buffer[0] = '\0'; | |
1363 | if (flags & BSF_LOCAL) | |
1364 | strcat (buffer, " local"); | |
1365 | ||
1366 | if (flags & BSF_GLOBAL) | |
1367 | strcat (buffer, " global"); | |
1368 | ||
1369 | if (flags & BSF_DEBUGGING) | |
1370 | strcat (buffer, " debug"); | |
1371 | ||
1372 | if (flags & BSF_FUNCTION) | |
1373 | strcat (buffer, " function"); | |
1374 | ||
1375 | if (flags & BSF_KEEP) | |
1376 | strcat (buffer, " keep"); | |
1377 | ||
1378 | if (flags & BSF_KEEP_G) | |
1379 | strcat (buffer, " keep_g"); | |
1380 | ||
1381 | if (flags & BSF_WEAK) | |
1382 | strcat (buffer, " weak"); | |
1383 | ||
1384 | if (flags & BSF_SECTION_SYM) | |
1385 | strcat (buffer, " section-sym"); | |
1386 | ||
1387 | if (flags & BSF_OLD_COMMON) | |
1388 | strcat (buffer, " old-common"); | |
1389 | ||
1390 | if (flags & BSF_NOT_AT_END) | |
1391 | strcat (buffer, " not-at-end"); | |
1392 | ||
1393 | if (flags & BSF_CONSTRUCTOR) | |
1394 | strcat (buffer, " constructor"); | |
1395 | ||
1396 | if (flags & BSF_WARNING) | |
1397 | strcat (buffer, " warning"); | |
1398 | ||
1399 | if (flags & BSF_INDIRECT) | |
1400 | strcat (buffer, " indirect"); | |
1401 | ||
1402 | if (flags & BSF_FILE) | |
1403 | strcat (buffer, " file"); | |
1404 | ||
1405 | if (flags & DYNAMIC) | |
1406 | strcat (buffer, " dynamic"); | |
1407 | ||
1408 | if (flags & ~(BSF_LOCAL | |
1409 | | BSF_GLOBAL | |
1410 | | BSF_DEBUGGING | |
1411 | | BSF_FUNCTION | |
1412 | | BSF_KEEP | |
1413 | | BSF_KEEP_G | |
1414 | | BSF_WEAK | |
1415 | | BSF_SECTION_SYM | |
1416 | | BSF_OLD_COMMON | |
1417 | | BSF_NOT_AT_END | |
1418 | | BSF_CONSTRUCTOR | |
1419 | | BSF_WARNING | |
1420 | | BSF_INDIRECT | |
1421 | | BSF_FILE | |
1422 | | BSF_DYNAMIC)) | |
1423 | strcat (buffer, " unknown-bits"); | |
1424 | ||
1425 | return buffer; | |
1426 | } | |
1427 | #endif | |
1428 | \f | |
1429 | #include "elfcore.h" | |
1430 | #include "elflink.h" | |
1431 | \f | |
1432 | /* Size-dependent data and functions. */ | |
1433 | const struct elf_size_info NAME(_bfd_elf,size_info) = { | |
1434 | sizeof (Elf_External_Ehdr), | |
1435 | sizeof (Elf_External_Phdr), | |
1436 | sizeof (Elf_External_Shdr), | |
1437 | sizeof (Elf_External_Rel), | |
1438 | sizeof (Elf_External_Rela), | |
1439 | sizeof (Elf_External_Sym), | |
1440 | sizeof (Elf_External_Dyn), | |
1441 | sizeof (Elf_External_Note), | |
1442 | ||
1443 | ARCH_SIZE, FILE_ALIGN, | |
1444 | ELFCLASS, EV_CURRENT, | |
1445 | elf_write_out_phdrs, | |
1446 | elf_write_shdrs_and_ehdr, | |
1447 | write_relocs, | |
1448 | elf_swap_symbol_out, | |
1449 | elf_slurp_reloc_table, | |
1450 | elf_slurp_symbol_table, | |
1451 | elf_swap_dyn_in | |
1452 | }; |