Commit | Line | Data |
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252b5132 | 1 | /* ELF executable support for BFD. |
7898deda | 2 | Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, |
e460dd0d | 3 | 2001, 2002, 2003, 2004, 2005, 2006 Free Software Foundation, Inc. |
252b5132 RH |
4 | |
5 | Written by Fred Fish @ Cygnus Support, from information published | |
6 | in "UNIX System V Release 4, Programmers Guide: ANSI C and | |
7 | Programming Support Tools". Sufficient support for gdb. | |
8 | ||
9 | Rewritten by Mark Eichin @ Cygnus Support, from information | |
10 | published in "System V Application Binary Interface", chapters 4 | |
11 | and 5, as well as the various "Processor Supplement" documents | |
12 | derived from it. Added support for assembler and other object file | |
13 | utilities. Further work done by Ken Raeburn (Cygnus Support), Michael | |
14 | Meissner (Open Software Foundation), and Peter Hoogenboom (University | |
15 | of Utah) to finish and extend this. | |
16 | ||
17 | This file is part of BFD, the Binary File Descriptor library. | |
18 | ||
19 | This program is free software; you can redistribute it and/or modify | |
20 | it under the terms of the GNU General Public License as published by | |
21 | the Free Software Foundation; either version 2 of the License, or | |
22 | (at your option) any later version. | |
23 | ||
24 | This program is distributed in the hope that it will be useful, | |
25 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27 | GNU General Public License for more details. | |
28 | ||
29 | You should have received a copy of the GNU General Public License | |
30 | along with this program; if not, write to the Free Software | |
3e110533 | 31 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */ |
252b5132 RH |
32 | |
33 | /* Problems and other issues to resolve. | |
34 | ||
35 | (1) BFD expects there to be some fixed number of "sections" in | |
0560d0f7 | 36 | the object file. I.E. there is a "section_count" variable in the |
252b5132 RH |
37 | bfd structure which contains the number of sections. However, ELF |
38 | supports multiple "views" of a file. In particular, with current | |
39 | implementations, executable files typically have two tables, a | |
40 | program header table and a section header table, both of which | |
41 | partition the executable. | |
42 | ||
43 | In ELF-speak, the "linking view" of the file uses the section header | |
44 | table to access "sections" within the file, and the "execution view" | |
45 | uses the program header table to access "segments" within the file. | |
46 | "Segments" typically may contain all the data from one or more | |
47 | "sections". | |
48 | ||
49 | Note that the section header table is optional in ELF executables, | |
50 | but it is this information that is most useful to gdb. If the | |
51 | section header table is missing, then gdb should probably try | |
52 | to make do with the program header table. (FIXME) | |
53 | ||
54 | (2) The code in this file is compiled twice, once in 32-bit mode and | |
55 | once in 64-bit mode. More of it should be made size-independent | |
56 | and moved into elf.c. | |
57 | ||
58 | (3) ELF section symbols are handled rather sloppily now. This should | |
59 | be cleaned up, and ELF section symbols reconciled with BFD section | |
60 | symbols. | |
61 | ||
62 | (4) We need a published spec for 64-bit ELF. We've got some stuff here | |
63 | that we're using for SPARC V9 64-bit chips, but don't assume that | |
64 | it's cast in stone. | |
65 | */ | |
66 | ||
67 | #include "bfd.h" | |
68 | #include "sysdep.h" | |
210ba1e8 | 69 | #include "libiberty.h" |
252b5132 RH |
70 | #include "bfdlink.h" |
71 | #include "libbfd.h" | |
72 | #include "elf-bfd.h" | |
73 | ||
74 | /* Renaming structures, typedefs, macros and functions to be size-specific. */ | |
75 | #define Elf_External_Ehdr NAME(Elf,External_Ehdr) | |
76 | #define Elf_External_Sym NAME(Elf,External_Sym) | |
77 | #define Elf_External_Shdr NAME(Elf,External_Shdr) | |
78 | #define Elf_External_Phdr NAME(Elf,External_Phdr) | |
79 | #define Elf_External_Rel NAME(Elf,External_Rel) | |
80 | #define Elf_External_Rela NAME(Elf,External_Rela) | |
81 | #define Elf_External_Dyn NAME(Elf,External_Dyn) | |
82 | ||
83 | #define elf_core_file_failing_command NAME(bfd_elf,core_file_failing_command) | |
84 | #define elf_core_file_failing_signal NAME(bfd_elf,core_file_failing_signal) | |
85 | #define elf_core_file_matches_executable_p \ | |
86 | NAME(bfd_elf,core_file_matches_executable_p) | |
87 | #define elf_object_p NAME(bfd_elf,object_p) | |
88 | #define elf_core_file_p NAME(bfd_elf,core_file_p) | |
89 | #define elf_get_symtab_upper_bound NAME(bfd_elf,get_symtab_upper_bound) | |
90 | #define elf_get_dynamic_symtab_upper_bound \ | |
91 | NAME(bfd_elf,get_dynamic_symtab_upper_bound) | |
92 | #define elf_swap_reloc_in NAME(bfd_elf,swap_reloc_in) | |
93 | #define elf_swap_reloca_in NAME(bfd_elf,swap_reloca_in) | |
94 | #define elf_swap_reloc_out NAME(bfd_elf,swap_reloc_out) | |
95 | #define elf_swap_reloca_out NAME(bfd_elf,swap_reloca_out) | |
96 | #define elf_swap_symbol_in NAME(bfd_elf,swap_symbol_in) | |
97 | #define elf_swap_symbol_out NAME(bfd_elf,swap_symbol_out) | |
98 | #define elf_swap_phdr_in NAME(bfd_elf,swap_phdr_in) | |
99 | #define elf_swap_phdr_out NAME(bfd_elf,swap_phdr_out) | |
100 | #define elf_swap_dyn_in NAME(bfd_elf,swap_dyn_in) | |
101 | #define elf_swap_dyn_out NAME(bfd_elf,swap_dyn_out) | |
102 | #define elf_get_reloc_upper_bound NAME(bfd_elf,get_reloc_upper_bound) | |
103 | #define elf_canonicalize_reloc NAME(bfd_elf,canonicalize_reloc) | |
104 | #define elf_slurp_symbol_table NAME(bfd_elf,slurp_symbol_table) | |
6cee3f79 | 105 | #define elf_canonicalize_symtab NAME(bfd_elf,canonicalize_symtab) |
252b5132 RH |
106 | #define elf_canonicalize_dynamic_symtab \ |
107 | NAME(bfd_elf,canonicalize_dynamic_symtab) | |
4c45e5c9 JJ |
108 | #define elf_get_synthetic_symtab \ |
109 | NAME(bfd_elf,get_synthetic_symtab) | |
252b5132 RH |
110 | #define elf_make_empty_symbol NAME(bfd_elf,make_empty_symbol) |
111 | #define elf_get_symbol_info NAME(bfd_elf,get_symbol_info) | |
112 | #define elf_get_lineno NAME(bfd_elf,get_lineno) | |
113 | #define elf_set_arch_mach NAME(bfd_elf,set_arch_mach) | |
114 | #define elf_find_nearest_line NAME(bfd_elf,find_nearest_line) | |
115 | #define elf_sizeof_headers NAME(bfd_elf,sizeof_headers) | |
116 | #define elf_set_section_contents NAME(bfd_elf,set_section_contents) | |
117 | #define elf_no_info_to_howto NAME(bfd_elf,no_info_to_howto) | |
118 | #define elf_no_info_to_howto_rel NAME(bfd_elf,no_info_to_howto_rel) | |
119 | #define elf_find_section NAME(bfd_elf,find_section) | |
252b5132 RH |
120 | #define elf_write_shdrs_and_ehdr NAME(bfd_elf,write_shdrs_and_ehdr) |
121 | #define elf_write_out_phdrs NAME(bfd_elf,write_out_phdrs) | |
b9f66672 JL |
122 | #define elf_write_relocs NAME(bfd_elf,write_relocs) |
123 | #define elf_slurp_reloc_table NAME(bfd_elf,slurp_reloc_table) | |
252b5132 RH |
124 | |
125 | #if ARCH_SIZE == 64 | |
126 | #define ELF_R_INFO(X,Y) ELF64_R_INFO(X,Y) | |
127 | #define ELF_R_SYM(X) ELF64_R_SYM(X) | |
128 | #define ELF_R_TYPE(X) ELF64_R_TYPE(X) | |
129 | #define ELFCLASS ELFCLASS64 | |
130 | #define FILE_ALIGN 8 | |
131 | #define LOG_FILE_ALIGN 3 | |
132 | #endif | |
133 | #if ARCH_SIZE == 32 | |
134 | #define ELF_R_INFO(X,Y) ELF32_R_INFO(X,Y) | |
135 | #define ELF_R_SYM(X) ELF32_R_SYM(X) | |
136 | #define ELF_R_TYPE(X) ELF32_R_TYPE(X) | |
137 | #define ELFCLASS ELFCLASS32 | |
138 | #define FILE_ALIGN 4 | |
139 | #define LOG_FILE_ALIGN 2 | |
140 | #endif | |
141 | ||
e460dd0d | 142 | #if DEBUG & 2 |
268b6b39 | 143 | static void elf_debug_section (int, Elf_Internal_Shdr *); |
e460dd0d AM |
144 | #endif |
145 | #if DEBUG & 1 | |
268b6b39 | 146 | static void elf_debug_file (Elf_Internal_Ehdr *); |
252b5132 RH |
147 | #endif |
148 | \f | |
149 | /* Structure swapping routines */ | |
150 | ||
151 | /* Should perhaps use put_offset, put_word, etc. For now, the two versions | |
152 | can be handled by explicitly specifying 32 bits or "the long type". */ | |
153 | #if ARCH_SIZE == 64 | |
dc810e39 AM |
154 | #define H_PUT_WORD H_PUT_64 |
155 | #define H_PUT_SIGNED_WORD H_PUT_S64 | |
156 | #define H_GET_WORD H_GET_64 | |
157 | #define H_GET_SIGNED_WORD H_GET_S64 | |
252b5132 RH |
158 | #endif |
159 | #if ARCH_SIZE == 32 | |
dc810e39 AM |
160 | #define H_PUT_WORD H_PUT_32 |
161 | #define H_PUT_SIGNED_WORD H_PUT_S32 | |
162 | #define H_GET_WORD H_GET_32 | |
163 | #define H_GET_SIGNED_WORD H_GET_S32 | |
252b5132 RH |
164 | #endif |
165 | ||
166 | /* Translate an ELF symbol in external format into an ELF symbol in internal | |
3e932841 | 167 | format. */ |
252b5132 RH |
168 | |
169 | void | |
268b6b39 AM |
170 | elf_swap_symbol_in (bfd *abfd, |
171 | const void *psrc, | |
172 | const void *pshn, | |
173 | Elf_Internal_Sym *dst) | |
252b5132 | 174 | { |
268b6b39 AM |
175 | const Elf_External_Sym *src = psrc; |
176 | const Elf_External_Sym_Shndx *shndx = pshn; | |
86dc0f79 RH |
177 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
178 | ||
dc810e39 | 179 | dst->st_name = H_GET_32 (abfd, src->st_name); |
86dc0f79 | 180 | if (signed_vma) |
dc810e39 | 181 | dst->st_value = H_GET_SIGNED_WORD (abfd, src->st_value); |
86dc0f79 | 182 | else |
dc810e39 AM |
183 | dst->st_value = H_GET_WORD (abfd, src->st_value); |
184 | dst->st_size = H_GET_WORD (abfd, src->st_size); | |
185 | dst->st_info = H_GET_8 (abfd, src->st_info); | |
186 | dst->st_other = H_GET_8 (abfd, src->st_other); | |
187 | dst->st_shndx = H_GET_16 (abfd, src->st_shndx); | |
9ad5cbcf AM |
188 | if (dst->st_shndx == SHN_XINDEX) |
189 | { | |
190 | if (shndx == NULL) | |
191 | abort (); | |
192 | dst->st_shndx = H_GET_32 (abfd, shndx->est_shndx); | |
193 | } | |
252b5132 RH |
194 | } |
195 | ||
196 | /* Translate an ELF symbol in internal format into an ELF symbol in external | |
3e932841 | 197 | format. */ |
252b5132 RH |
198 | |
199 | void | |
268b6b39 AM |
200 | elf_swap_symbol_out (bfd *abfd, |
201 | const Elf_Internal_Sym *src, | |
202 | void *cdst, | |
203 | void *shndx) | |
252b5132 | 204 | { |
9ad5cbcf | 205 | unsigned int tmp; |
268b6b39 | 206 | Elf_External_Sym *dst = cdst; |
dc810e39 AM |
207 | H_PUT_32 (abfd, src->st_name, dst->st_name); |
208 | H_PUT_WORD (abfd, src->st_value, dst->st_value); | |
209 | H_PUT_WORD (abfd, src->st_size, dst->st_size); | |
210 | H_PUT_8 (abfd, src->st_info, dst->st_info); | |
211 | H_PUT_8 (abfd, src->st_other, dst->st_other); | |
9ad5cbcf AM |
212 | tmp = src->st_shndx; |
213 | if (tmp > SHN_HIRESERVE) | |
214 | { | |
215 | if (shndx == NULL) | |
216 | abort (); | |
217 | H_PUT_32 (abfd, tmp, shndx); | |
218 | tmp = SHN_XINDEX; | |
219 | } | |
220 | H_PUT_16 (abfd, tmp, dst->st_shndx); | |
252b5132 RH |
221 | } |
222 | ||
252b5132 | 223 | /* Translate an ELF file header in external format into an ELF file header in |
3e932841 | 224 | internal format. */ |
252b5132 RH |
225 | |
226 | static void | |
268b6b39 AM |
227 | elf_swap_ehdr_in (bfd *abfd, |
228 | const Elf_External_Ehdr *src, | |
229 | Elf_Internal_Ehdr *dst) | |
252b5132 | 230 | { |
448cafa4 | 231 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
252b5132 | 232 | memcpy (dst->e_ident, src->e_ident, EI_NIDENT); |
dc810e39 AM |
233 | dst->e_type = H_GET_16 (abfd, src->e_type); |
234 | dst->e_machine = H_GET_16 (abfd, src->e_machine); | |
235 | dst->e_version = H_GET_32 (abfd, src->e_version); | |
448cafa4 | 236 | if (signed_vma) |
dc810e39 | 237 | dst->e_entry = H_GET_SIGNED_WORD (abfd, src->e_entry); |
448cafa4 | 238 | else |
dc810e39 AM |
239 | dst->e_entry = H_GET_WORD (abfd, src->e_entry); |
240 | dst->e_phoff = H_GET_WORD (abfd, src->e_phoff); | |
241 | dst->e_shoff = H_GET_WORD (abfd, src->e_shoff); | |
242 | dst->e_flags = H_GET_32 (abfd, src->e_flags); | |
243 | dst->e_ehsize = H_GET_16 (abfd, src->e_ehsize); | |
244 | dst->e_phentsize = H_GET_16 (abfd, src->e_phentsize); | |
245 | dst->e_phnum = H_GET_16 (abfd, src->e_phnum); | |
246 | dst->e_shentsize = H_GET_16 (abfd, src->e_shentsize); | |
247 | dst->e_shnum = H_GET_16 (abfd, src->e_shnum); | |
248 | dst->e_shstrndx = H_GET_16 (abfd, src->e_shstrndx); | |
252b5132 RH |
249 | } |
250 | ||
251 | /* Translate an ELF file header in internal format into an ELF file header in | |
3e932841 | 252 | external format. */ |
252b5132 RH |
253 | |
254 | static void | |
268b6b39 AM |
255 | elf_swap_ehdr_out (bfd *abfd, |
256 | const Elf_Internal_Ehdr *src, | |
257 | Elf_External_Ehdr *dst) | |
252b5132 | 258 | { |
5732c114 | 259 | unsigned int tmp; |
448cafa4 | 260 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
252b5132 | 261 | memcpy (dst->e_ident, src->e_ident, EI_NIDENT); |
3e932841 | 262 | /* note that all elements of dst are *arrays of unsigned char* already... */ |
dc810e39 AM |
263 | H_PUT_16 (abfd, src->e_type, dst->e_type); |
264 | H_PUT_16 (abfd, src->e_machine, dst->e_machine); | |
265 | H_PUT_32 (abfd, src->e_version, dst->e_version); | |
448cafa4 | 266 | if (signed_vma) |
dc810e39 | 267 | H_PUT_SIGNED_WORD (abfd, src->e_entry, dst->e_entry); |
448cafa4 | 268 | else |
dc810e39 AM |
269 | H_PUT_WORD (abfd, src->e_entry, dst->e_entry); |
270 | H_PUT_WORD (abfd, src->e_phoff, dst->e_phoff); | |
271 | H_PUT_WORD (abfd, src->e_shoff, dst->e_shoff); | |
272 | H_PUT_32 (abfd, src->e_flags, dst->e_flags); | |
273 | H_PUT_16 (abfd, src->e_ehsize, dst->e_ehsize); | |
274 | H_PUT_16 (abfd, src->e_phentsize, dst->e_phentsize); | |
275 | H_PUT_16 (abfd, src->e_phnum, dst->e_phnum); | |
276 | H_PUT_16 (abfd, src->e_shentsize, dst->e_shentsize); | |
5732c114 AM |
277 | tmp = src->e_shnum; |
278 | if (tmp >= SHN_LORESERVE) | |
279 | tmp = SHN_UNDEF; | |
280 | H_PUT_16 (abfd, tmp, dst->e_shnum); | |
281 | tmp = src->e_shstrndx; | |
282 | if (tmp >= SHN_LORESERVE) | |
283 | tmp = SHN_XINDEX; | |
284 | H_PUT_16 (abfd, tmp, dst->e_shstrndx); | |
252b5132 RH |
285 | } |
286 | ||
252b5132 | 287 | /* Translate an ELF section header table entry in external format into an |
3e932841 | 288 | ELF section header table entry in internal format. */ |
252b5132 RH |
289 | |
290 | static void | |
268b6b39 AM |
291 | elf_swap_shdr_in (bfd *abfd, |
292 | const Elf_External_Shdr *src, | |
293 | Elf_Internal_Shdr *dst) | |
252b5132 | 294 | { |
86dc0f79 RH |
295 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
296 | ||
dc810e39 AM |
297 | dst->sh_name = H_GET_32 (abfd, src->sh_name); |
298 | dst->sh_type = H_GET_32 (abfd, src->sh_type); | |
299 | dst->sh_flags = H_GET_WORD (abfd, src->sh_flags); | |
86dc0f79 | 300 | if (signed_vma) |
dc810e39 | 301 | dst->sh_addr = H_GET_SIGNED_WORD (abfd, src->sh_addr); |
86dc0f79 | 302 | else |
dc810e39 AM |
303 | dst->sh_addr = H_GET_WORD (abfd, src->sh_addr); |
304 | dst->sh_offset = H_GET_WORD (abfd, src->sh_offset); | |
305 | dst->sh_size = H_GET_WORD (abfd, src->sh_size); | |
306 | dst->sh_link = H_GET_32 (abfd, src->sh_link); | |
307 | dst->sh_info = H_GET_32 (abfd, src->sh_info); | |
308 | dst->sh_addralign = H_GET_WORD (abfd, src->sh_addralign); | |
309 | dst->sh_entsize = H_GET_WORD (abfd, src->sh_entsize); | |
252b5132 RH |
310 | dst->bfd_section = NULL; |
311 | dst->contents = NULL; | |
312 | } | |
313 | ||
314 | /* Translate an ELF section header table entry in internal format into an | |
3e932841 | 315 | ELF section header table entry in external format. */ |
252b5132 RH |
316 | |
317 | static void | |
268b6b39 AM |
318 | elf_swap_shdr_out (bfd *abfd, |
319 | const Elf_Internal_Shdr *src, | |
320 | Elf_External_Shdr *dst) | |
252b5132 | 321 | { |
3e932841 | 322 | /* note that all elements of dst are *arrays of unsigned char* already... */ |
dc810e39 AM |
323 | H_PUT_32 (abfd, src->sh_name, dst->sh_name); |
324 | H_PUT_32 (abfd, src->sh_type, dst->sh_type); | |
325 | H_PUT_WORD (abfd, src->sh_flags, dst->sh_flags); | |
326 | H_PUT_WORD (abfd, src->sh_addr, dst->sh_addr); | |
327 | H_PUT_WORD (abfd, src->sh_offset, dst->sh_offset); | |
328 | H_PUT_WORD (abfd, src->sh_size, dst->sh_size); | |
329 | H_PUT_32 (abfd, src->sh_link, dst->sh_link); | |
330 | H_PUT_32 (abfd, src->sh_info, dst->sh_info); | |
331 | H_PUT_WORD (abfd, src->sh_addralign, dst->sh_addralign); | |
332 | H_PUT_WORD (abfd, src->sh_entsize, dst->sh_entsize); | |
252b5132 RH |
333 | } |
334 | ||
252b5132 | 335 | /* Translate an ELF program header table entry in external format into an |
3e932841 | 336 | ELF program header table entry in internal format. */ |
252b5132 RH |
337 | |
338 | void | |
268b6b39 AM |
339 | elf_swap_phdr_in (bfd *abfd, |
340 | const Elf_External_Phdr *src, | |
341 | Elf_Internal_Phdr *dst) | |
252b5132 | 342 | { |
86dc0f79 RH |
343 | int signed_vma = get_elf_backend_data (abfd)->sign_extend_vma; |
344 | ||
dc810e39 AM |
345 | dst->p_type = H_GET_32 (abfd, src->p_type); |
346 | dst->p_flags = H_GET_32 (abfd, src->p_flags); | |
347 | dst->p_offset = H_GET_WORD (abfd, src->p_offset); | |
86dc0f79 RH |
348 | if (signed_vma) |
349 | { | |
dc810e39 AM |
350 | dst->p_vaddr = H_GET_SIGNED_WORD (abfd, src->p_vaddr); |
351 | dst->p_paddr = H_GET_SIGNED_WORD (abfd, src->p_paddr); | |
86dc0f79 RH |
352 | } |
353 | else | |
354 | { | |
dc810e39 AM |
355 | dst->p_vaddr = H_GET_WORD (abfd, src->p_vaddr); |
356 | dst->p_paddr = H_GET_WORD (abfd, src->p_paddr); | |
86dc0f79 | 357 | } |
dc810e39 AM |
358 | dst->p_filesz = H_GET_WORD (abfd, src->p_filesz); |
359 | dst->p_memsz = H_GET_WORD (abfd, src->p_memsz); | |
360 | dst->p_align = H_GET_WORD (abfd, src->p_align); | |
252b5132 RH |
361 | } |
362 | ||
363 | void | |
268b6b39 AM |
364 | elf_swap_phdr_out (bfd *abfd, |
365 | const Elf_Internal_Phdr *src, | |
366 | Elf_External_Phdr *dst) | |
252b5132 | 367 | { |
3e932841 | 368 | /* note that all elements of dst are *arrays of unsigned char* already... */ |
dc810e39 AM |
369 | H_PUT_32 (abfd, src->p_type, dst->p_type); |
370 | H_PUT_WORD (abfd, src->p_offset, dst->p_offset); | |
371 | H_PUT_WORD (abfd, src->p_vaddr, dst->p_vaddr); | |
372 | H_PUT_WORD (abfd, src->p_paddr, dst->p_paddr); | |
373 | H_PUT_WORD (abfd, src->p_filesz, dst->p_filesz); | |
374 | H_PUT_WORD (abfd, src->p_memsz, dst->p_memsz); | |
375 | H_PUT_32 (abfd, src->p_flags, dst->p_flags); | |
376 | H_PUT_WORD (abfd, src->p_align, dst->p_align); | |
252b5132 RH |
377 | } |
378 | ||
3e932841 | 379 | /* Translate an ELF reloc from external format to internal format. */ |
947216bf | 380 | void |
268b6b39 AM |
381 | elf_swap_reloc_in (bfd *abfd, |
382 | const bfd_byte *s, | |
383 | Elf_Internal_Rela *dst) | |
252b5132 | 384 | { |
947216bf | 385 | const Elf_External_Rel *src = (const Elf_External_Rel *) s; |
dc810e39 AM |
386 | dst->r_offset = H_GET_WORD (abfd, src->r_offset); |
387 | dst->r_info = H_GET_WORD (abfd, src->r_info); | |
947216bf | 388 | dst->r_addend = 0; |
252b5132 RH |
389 | } |
390 | ||
947216bf | 391 | void |
268b6b39 AM |
392 | elf_swap_reloca_in (bfd *abfd, |
393 | const bfd_byte *s, | |
394 | Elf_Internal_Rela *dst) | |
252b5132 | 395 | { |
947216bf | 396 | const Elf_External_Rela *src = (const Elf_External_Rela *) s; |
dc810e39 AM |
397 | dst->r_offset = H_GET_WORD (abfd, src->r_offset); |
398 | dst->r_info = H_GET_WORD (abfd, src->r_info); | |
399 | dst->r_addend = H_GET_SIGNED_WORD (abfd, src->r_addend); | |
252b5132 RH |
400 | } |
401 | ||
3e932841 | 402 | /* Translate an ELF reloc from internal format to external format. */ |
947216bf | 403 | void |
268b6b39 AM |
404 | elf_swap_reloc_out (bfd *abfd, |
405 | const Elf_Internal_Rela *src, | |
406 | bfd_byte *d) | |
252b5132 | 407 | { |
947216bf | 408 | Elf_External_Rel *dst = (Elf_External_Rel *) d; |
dc810e39 AM |
409 | H_PUT_WORD (abfd, src->r_offset, dst->r_offset); |
410 | H_PUT_WORD (abfd, src->r_info, dst->r_info); | |
252b5132 RH |
411 | } |
412 | ||
947216bf | 413 | void |
268b6b39 AM |
414 | elf_swap_reloca_out (bfd *abfd, |
415 | const Elf_Internal_Rela *src, | |
416 | bfd_byte *d) | |
252b5132 | 417 | { |
947216bf | 418 | Elf_External_Rela *dst = (Elf_External_Rela *) d; |
dc810e39 AM |
419 | H_PUT_WORD (abfd, src->r_offset, dst->r_offset); |
420 | H_PUT_WORD (abfd, src->r_info, dst->r_info); | |
421 | H_PUT_SIGNED_WORD (abfd, src->r_addend, dst->r_addend); | |
252b5132 RH |
422 | } |
423 | ||
268b6b39 AM |
424 | void |
425 | elf_swap_dyn_in (bfd *abfd, | |
426 | const void *p, | |
427 | Elf_Internal_Dyn *dst) | |
252b5132 | 428 | { |
268b6b39 | 429 | const Elf_External_Dyn *src = p; |
252b5132 | 430 | |
dc810e39 AM |
431 | dst->d_tag = H_GET_WORD (abfd, src->d_tag); |
432 | dst->d_un.d_val = H_GET_WORD (abfd, src->d_un.d_val); | |
252b5132 RH |
433 | } |
434 | ||
268b6b39 AM |
435 | void |
436 | elf_swap_dyn_out (bfd *abfd, | |
437 | const Elf_Internal_Dyn *src, | |
438 | void *p) | |
252b5132 | 439 | { |
268b6b39 | 440 | Elf_External_Dyn *dst = p; |
c7ac6ff8 | 441 | |
dc810e39 AM |
442 | H_PUT_WORD (abfd, src->d_tag, dst->d_tag); |
443 | H_PUT_WORD (abfd, src->d_un.d_val, dst->d_un.d_val); | |
252b5132 RH |
444 | } |
445 | \f | |
446 | /* ELF .o/exec file reading */ | |
447 | ||
252b5132 RH |
448 | /* Begin processing a given object. |
449 | ||
450 | First we validate the file by reading in the ELF header and checking | |
451 | the magic number. */ | |
452 | ||
268b6b39 AM |
453 | static inline bfd_boolean |
454 | elf_file_p (Elf_External_Ehdr *x_ehdrp) | |
252b5132 RH |
455 | { |
456 | return ((x_ehdrp->e_ident[EI_MAG0] == ELFMAG0) | |
457 | && (x_ehdrp->e_ident[EI_MAG1] == ELFMAG1) | |
458 | && (x_ehdrp->e_ident[EI_MAG2] == ELFMAG2) | |
459 | && (x_ehdrp->e_ident[EI_MAG3] == ELFMAG3)); | |
460 | } | |
461 | ||
462 | /* Check to see if the file associated with ABFD matches the target vector | |
463 | that ABFD points to. | |
464 | ||
465 | Note that we may be called several times with the same ABFD, but different | |
466 | target vectors, most of which will not match. We have to avoid leaving | |
467 | any side effects in ABFD, or any data it points to (like tdata), if the | |
468 | file does not match the target vector. */ | |
469 | ||
470 | const bfd_target * | |
268b6b39 | 471 | elf_object_p (bfd *abfd) |
252b5132 RH |
472 | { |
473 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ | |
474 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ | |
475 | Elf_External_Shdr x_shdr; /* Section header table entry, external form */ | |
5732c114 | 476 | Elf_Internal_Shdr i_shdr; |
ed591155 | 477 | Elf_Internal_Shdr *i_shdrp; /* Section header table, internal form */ |
252b5132 | 478 | unsigned int shindex; |
9c5bfbb7 | 479 | const struct elf_backend_data *ebd; |
ed591155 | 480 | struct bfd_preserve preserve; |
252b5132 | 481 | asection *s; |
dc810e39 | 482 | bfd_size_type amt; |
252b5132 | 483 | |
e84d6fca | 484 | preserve.marker = NULL; |
a17cc40f | 485 | |
252b5132 RH |
486 | /* Read in the ELF header in external format. */ |
487 | ||
268b6b39 | 488 | if (bfd_bread (&x_ehdr, sizeof (x_ehdr), abfd) != sizeof (x_ehdr)) |
252b5132 RH |
489 | { |
490 | if (bfd_get_error () != bfd_error_system_call) | |
491 | goto got_wrong_format_error; | |
492 | else | |
493 | goto got_no_match; | |
494 | } | |
495 | ||
496 | /* Now check to see if we have a valid ELF file, and one that BFD can | |
497 | make use of. The magic number must match, the address size ('class') | |
498 | and byte-swapping must match our XVEC entry, and it must have a | |
499 | section header table (FIXME: See comments re sections at top of this | |
3e932841 | 500 | file). */ |
252b5132 | 501 | |
82e51918 AM |
502 | if (! elf_file_p (&x_ehdr) |
503 | || x_ehdr.e_ident[EI_VERSION] != EV_CURRENT | |
504 | || x_ehdr.e_ident[EI_CLASS] != ELFCLASS) | |
252b5132 RH |
505 | goto got_wrong_format_error; |
506 | ||
507 | /* Check that file's byte order matches xvec's */ | |
508 | switch (x_ehdr.e_ident[EI_DATA]) | |
509 | { | |
510 | case ELFDATA2MSB: /* Big-endian */ | |
511 | if (! bfd_header_big_endian (abfd)) | |
512 | goto got_wrong_format_error; | |
513 | break; | |
514 | case ELFDATA2LSB: /* Little-endian */ | |
515 | if (! bfd_header_little_endian (abfd)) | |
516 | goto got_wrong_format_error; | |
517 | break; | |
518 | case ELFDATANONE: /* No data encoding specified */ | |
519 | default: /* Unknown data encoding specified */ | |
520 | goto got_wrong_format_error; | |
521 | } | |
522 | ||
0c83546a AM |
523 | if (!bfd_preserve_save (abfd, &preserve)) |
524 | goto got_no_match; | |
525 | ||
252b5132 RH |
526 | /* Allocate an instance of the elf_obj_tdata structure and hook it up to |
527 | the tdata pointer in the bfd. */ | |
528 | ||
0c83546a | 529 | if (! (*abfd->xvec->_bfd_set_format[bfd_object]) (abfd)) |
252b5132 | 530 | goto got_no_match; |
0c83546a | 531 | preserve.marker = elf_tdata (abfd); |
e84d6fca | 532 | |
252b5132 RH |
533 | /* Now that we know the byte order, swap in the rest of the header */ |
534 | i_ehdrp = elf_elfheader (abfd); | |
535 | elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp); | |
536 | #if DEBUG & 1 | |
537 | elf_debug_file (i_ehdrp); | |
538 | #endif | |
539 | ||
540 | /* Reject ET_CORE (header indicates core file, not object file) */ | |
541 | if (i_ehdrp->e_type == ET_CORE) | |
542 | goto got_wrong_format_error; | |
543 | ||
0c35f01a AM |
544 | /* If this is a relocatable file and there is no section header |
545 | table, then we're hosed. */ | |
546 | if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_type == ET_REL) | |
252b5132 RH |
547 | goto got_wrong_format_error; |
548 | ||
e460dd0d | 549 | /* As a simple sanity check, verify that what BFD thinks is the |
252b5132 | 550 | size of each section header table entry actually matches the size |
0c35f01a AM |
551 | recorded in the file, but only if there are any sections. */ |
552 | if (i_ehdrp->e_shentsize != sizeof (x_shdr) && i_ehdrp->e_shnum != 0) | |
252b5132 RH |
553 | goto got_wrong_format_error; |
554 | ||
7ece0d85 JJ |
555 | /* Further sanity check. */ |
556 | if (i_ehdrp->e_shoff == 0 && i_ehdrp->e_shnum != 0) | |
557 | goto got_wrong_format_error; | |
558 | ||
252b5132 RH |
559 | ebd = get_elf_backend_data (abfd); |
560 | ||
561 | /* Check that the ELF e_machine field matches what this particular | |
562 | BFD format expects. */ | |
563 | if (ebd->elf_machine_code != i_ehdrp->e_machine | |
e84d6fca AM |
564 | && (ebd->elf_machine_alt1 == 0 |
565 | || i_ehdrp->e_machine != ebd->elf_machine_alt1) | |
566 | && (ebd->elf_machine_alt2 == 0 | |
567 | || i_ehdrp->e_machine != ebd->elf_machine_alt2)) | |
252b5132 RH |
568 | { |
569 | const bfd_target * const *target_ptr; | |
570 | ||
571 | if (ebd->elf_machine_code != EM_NONE) | |
572 | goto got_wrong_format_error; | |
573 | ||
574 | /* This is the generic ELF target. Let it match any ELF target | |
575 | for which we do not have a specific backend. */ | |
576 | for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++) | |
577 | { | |
9c5bfbb7 | 578 | const struct elf_backend_data *back; |
252b5132 RH |
579 | |
580 | if ((*target_ptr)->flavour != bfd_target_elf_flavour) | |
581 | continue; | |
9c5bfbb7 | 582 | back = (const struct elf_backend_data *) (*target_ptr)->backend_data; |
252b5132 RH |
583 | if (back->elf_machine_code == i_ehdrp->e_machine |
584 | || (back->elf_machine_alt1 != 0 | |
585 | && back->elf_machine_alt1 == i_ehdrp->e_machine) | |
586 | || (back->elf_machine_alt2 != 0 | |
587 | && back->elf_machine_alt2 == i_ehdrp->e_machine)) | |
588 | { | |
589 | /* target_ptr is an ELF backend which matches this | |
590 | object file, so reject the generic ELF target. */ | |
591 | goto got_wrong_format_error; | |
592 | } | |
593 | } | |
594 | } | |
595 | ||
596 | if (i_ehdrp->e_type == ET_EXEC) | |
597 | abfd->flags |= EXEC_P; | |
598 | else if (i_ehdrp->e_type == ET_DYN) | |
599 | abfd->flags |= DYNAMIC; | |
600 | ||
601 | if (i_ehdrp->e_phnum > 0) | |
602 | abfd->flags |= D_PAGED; | |
603 | ||
604 | if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0)) | |
605 | { | |
606 | /* It's OK if this fails for the generic target. */ | |
607 | if (ebd->elf_machine_code != EM_NONE) | |
608 | goto got_no_match; | |
609 | } | |
610 | ||
7ece0d85 JJ |
611 | if (i_ehdrp->e_shoff != 0) |
612 | { | |
0560d0f7 AM |
613 | bfd_signed_vma where = i_ehdrp->e_shoff; |
614 | ||
615 | if (where != (file_ptr) where) | |
616 | goto got_wrong_format_error; | |
617 | ||
7ece0d85 | 618 | /* Seek to the section header table in the file. */ |
0560d0f7 | 619 | if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0) |
7ece0d85 | 620 | goto got_no_match; |
5732c114 | 621 | |
7ece0d85 JJ |
622 | /* Read the first section header at index 0, and convert to internal |
623 | form. */ | |
268b6b39 | 624 | if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr)) |
7ece0d85 JJ |
625 | goto got_no_match; |
626 | elf_swap_shdr_in (abfd, &x_shdr, &i_shdr); | |
5732c114 | 627 | |
7ece0d85 JJ |
628 | /* If the section count is zero, the actual count is in the first |
629 | section header. */ | |
630 | if (i_ehdrp->e_shnum == SHN_UNDEF) | |
0560d0f7 AM |
631 | { |
632 | i_ehdrp->e_shnum = i_shdr.sh_size; | |
24639c7d JJ |
633 | if (i_ehdrp->e_shnum != i_shdr.sh_size |
634 | || i_ehdrp->e_shnum == 0) | |
0560d0f7 AM |
635 | goto got_wrong_format_error; |
636 | } | |
5732c114 | 637 | |
7ece0d85 JJ |
638 | /* And similarly for the string table index. */ |
639 | if (i_ehdrp->e_shstrndx == SHN_XINDEX) | |
0560d0f7 AM |
640 | { |
641 | i_ehdrp->e_shstrndx = i_shdr.sh_link; | |
642 | if (i_ehdrp->e_shstrndx != i_shdr.sh_link) | |
643 | goto got_wrong_format_error; | |
644 | } | |
645 | ||
646 | /* Sanity check that we can read all of the section headers. | |
647 | It ought to be good enough to just read the last one. */ | |
648 | if (i_ehdrp->e_shnum != 1) | |
649 | { | |
650 | /* Check that we don't have a totally silly number of sections. */ | |
24639c7d JJ |
651 | if (i_ehdrp->e_shnum > (unsigned int) -1 / sizeof (x_shdr) |
652 | || i_ehdrp->e_shnum > (unsigned int) -1 / sizeof (i_shdr)) | |
0560d0f7 AM |
653 | goto got_wrong_format_error; |
654 | ||
655 | where += (i_ehdrp->e_shnum - 1) * sizeof (x_shdr); | |
656 | if (where != (file_ptr) where) | |
657 | goto got_wrong_format_error; | |
658 | if ((bfd_size_type) where <= i_ehdrp->e_shoff) | |
659 | goto got_wrong_format_error; | |
660 | ||
661 | if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0) | |
662 | goto got_no_match; | |
663 | if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr)) | |
664 | goto got_no_match; | |
665 | ||
666 | /* Back to where we were. */ | |
667 | where = i_ehdrp->e_shoff + sizeof (x_shdr); | |
668 | if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0) | |
669 | goto got_no_match; | |
670 | } | |
7ece0d85 | 671 | } |
5732c114 | 672 | |
252b5132 | 673 | /* Allocate space for a copy of the section header table in |
5732c114 | 674 | internal form. */ |
0c35f01a AM |
675 | if (i_ehdrp->e_shnum != 0) |
676 | { | |
5732c114 | 677 | Elf_Internal_Shdr *shdrp; |
9ad5cbcf | 678 | unsigned int num_sec; |
5732c114 | 679 | |
0c35f01a | 680 | amt = sizeof (*i_shdrp) * i_ehdrp->e_shnum; |
268b6b39 | 681 | i_shdrp = bfd_alloc (abfd, amt); |
5732c114 AM |
682 | if (!i_shdrp) |
683 | goto got_no_match; | |
9ad5cbcf AM |
684 | num_sec = i_ehdrp->e_shnum; |
685 | if (num_sec > SHN_LORESERVE) | |
686 | num_sec += SHN_HIRESERVE + 1 - SHN_LORESERVE; | |
687 | elf_numsections (abfd) = num_sec; | |
688 | amt = sizeof (i_shdrp) * num_sec; | |
268b6b39 | 689 | elf_elfsections (abfd) = bfd_alloc (abfd, amt); |
5732c114 | 690 | if (!elf_elfsections (abfd)) |
0c35f01a | 691 | goto got_no_match; |
5732c114 AM |
692 | |
693 | memcpy (i_shdrp, &i_shdr, sizeof (*i_shdrp)); | |
694 | shdrp = i_shdrp; | |
695 | shindex = 0; | |
9ad5cbcf | 696 | if (num_sec > SHN_LORESERVE) |
5732c114 AM |
697 | { |
698 | for ( ; shindex < SHN_LORESERVE; shindex++) | |
699 | elf_elfsections (abfd)[shindex] = shdrp++; | |
700 | for ( ; shindex < SHN_HIRESERVE + 1; shindex++) | |
9ad5cbcf | 701 | elf_elfsections (abfd)[shindex] = i_shdrp; |
5732c114 | 702 | } |
9ad5cbcf | 703 | for ( ; shindex < num_sec; shindex++) |
5732c114 | 704 | elf_elfsections (abfd)[shindex] = shdrp++; |
5732c114 | 705 | |
ed591155 AM |
706 | /* Read in the rest of the section header table and convert it |
707 | to internal form. */ | |
708 | for (shindex = 1; shindex < i_ehdrp->e_shnum; shindex++) | |
709 | { | |
268b6b39 | 710 | if (bfd_bread (&x_shdr, sizeof x_shdr, abfd) != sizeof (x_shdr)) |
ed591155 AM |
711 | goto got_no_match; |
712 | elf_swap_shdr_in (abfd, &x_shdr, i_shdrp + shindex); | |
713 | ||
24639c7d JJ |
714 | /* Sanity check sh_link and sh_info. */ |
715 | if (i_shdrp[shindex].sh_link >= num_sec | |
716 | || (i_shdrp[shindex].sh_link >= SHN_LORESERVE | |
717 | && i_shdrp[shindex].sh_link <= SHN_HIRESERVE)) | |
718 | goto got_wrong_format_error; | |
719 | ||
720 | if (((i_shdrp[shindex].sh_flags & SHF_INFO_LINK) | |
721 | || i_shdrp[shindex].sh_type == SHT_RELA | |
722 | || i_shdrp[shindex].sh_type == SHT_REL) | |
723 | && (i_shdrp[shindex].sh_info >= num_sec | |
724 | || (i_shdrp[shindex].sh_info >= SHN_LORESERVE | |
725 | && i_shdrp[shindex].sh_info <= SHN_HIRESERVE))) | |
726 | goto got_wrong_format_error; | |
727 | ||
ed591155 AM |
728 | /* If the section is loaded, but not page aligned, clear |
729 | D_PAGED. */ | |
730 | if (i_shdrp[shindex].sh_size != 0 | |
731 | && (i_shdrp[shindex].sh_flags & SHF_ALLOC) != 0 | |
732 | && i_shdrp[shindex].sh_type != SHT_NOBITS | |
733 | && (((i_shdrp[shindex].sh_addr - i_shdrp[shindex].sh_offset) | |
b1342370 | 734 | % ebd->minpagesize) |
ed591155 AM |
735 | != 0)) |
736 | abfd->flags &= ~D_PAGED; | |
737 | } | |
252b5132 | 738 | } |
ed591155 | 739 | |
24639c7d JJ |
740 | /* A further sanity check. */ |
741 | if (i_ehdrp->e_shnum != 0) | |
742 | { | |
743 | if (i_ehdrp->e_shstrndx >= elf_numsections (abfd) | |
744 | || (i_ehdrp->e_shstrndx >= SHN_LORESERVE | |
745 | && i_ehdrp->e_shstrndx <= SHN_HIRESERVE)) | |
0b49d371 NC |
746 | { |
747 | /* PR 2257: | |
748 | We used to just goto got_wrong_format_error here | |
749 | but there are binaries in existance for which this test | |
750 | will prevent the binutils from working with them at all. | |
751 | So we are kind, and reset the string index value to 0 | |
752 | so that at least some processing can be done. */ | |
753 | i_ehdrp->e_shstrndx = SHN_UNDEF; | |
754 | _bfd_error_handler (_("warning: %s has a corrupt string table index - ignoring"), abfd->filename); | |
755 | } | |
24639c7d | 756 | } |
0b49d371 | 757 | else if (i_ehdrp->e_shstrndx != SHN_UNDEF) |
24639c7d JJ |
758 | goto got_wrong_format_error; |
759 | ||
252b5132 RH |
760 | /* Read in the program headers. */ |
761 | if (i_ehdrp->e_phnum == 0) | |
762 | elf_tdata (abfd)->phdr = NULL; | |
763 | else | |
764 | { | |
765 | Elf_Internal_Phdr *i_phdr; | |
766 | unsigned int i; | |
767 | ||
dc810e39 | 768 | amt = i_ehdrp->e_phnum * sizeof (Elf_Internal_Phdr); |
268b6b39 | 769 | elf_tdata (abfd)->phdr = bfd_alloc (abfd, amt); |
252b5132 RH |
770 | if (elf_tdata (abfd)->phdr == NULL) |
771 | goto got_no_match; | |
dc810e39 | 772 | if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0) |
252b5132 RH |
773 | goto got_no_match; |
774 | i_phdr = elf_tdata (abfd)->phdr; | |
775 | for (i = 0; i < i_ehdrp->e_phnum; i++, i_phdr++) | |
776 | { | |
777 | Elf_External_Phdr x_phdr; | |
778 | ||
268b6b39 | 779 | if (bfd_bread (&x_phdr, sizeof x_phdr, abfd) != sizeof x_phdr) |
252b5132 RH |
780 | goto got_no_match; |
781 | elf_swap_phdr_in (abfd, &x_phdr, i_phdr); | |
782 | } | |
783 | } | |
784 | ||
1b3a8575 | 785 | if (i_ehdrp->e_shstrndx != 0 && i_ehdrp->e_shoff != 0) |
252b5132 | 786 | { |
9ad5cbcf AM |
787 | unsigned int num_sec; |
788 | ||
0c35f01a AM |
789 | /* Once all of the section headers have been read and converted, we |
790 | can start processing them. Note that the first section header is | |
791 | a dummy placeholder entry, so we ignore it. */ | |
9ad5cbcf AM |
792 | num_sec = elf_numsections (abfd); |
793 | for (shindex = 1; shindex < num_sec; shindex++) | |
0c35f01a AM |
794 | { |
795 | if (! bfd_section_from_shdr (abfd, shindex)) | |
796 | goto got_no_match; | |
9ad5cbcf AM |
797 | if (shindex == SHN_LORESERVE - 1) |
798 | shindex += SHN_HIRESERVE + 1 - SHN_LORESERVE; | |
0c35f01a | 799 | } |
3d7f7666 | 800 | |
dd863624 L |
801 | /* Set up ELF sections for SHF_GROUP and SHF_LINK_ORDER. */ |
802 | if (! _bfd_elf_setup_sections (abfd)) | |
3d7f7666 | 803 | goto got_wrong_format_error; |
252b5132 RH |
804 | } |
805 | ||
806 | /* Let the backend double check the format and override global | |
807 | information. */ | |
808 | if (ebd->elf_backend_object_p) | |
809 | { | |
82e51918 | 810 | if (! (*ebd->elf_backend_object_p) (abfd)) |
252b5132 RH |
811 | goto got_wrong_format_error; |
812 | } | |
813 | ||
a14199db AM |
814 | /* Remember the entry point specified in the ELF file header. */ |
815 | bfd_set_start_address (abfd, i_ehdrp->e_entry); | |
816 | ||
252b5132 RH |
817 | /* If we have created any reloc sections that are associated with |
818 | debugging sections, mark the reloc sections as debugging as well. */ | |
819 | for (s = abfd->sections; s != NULL; s = s->next) | |
820 | { | |
821 | if ((elf_section_data (s)->this_hdr.sh_type == SHT_REL | |
822 | || elf_section_data (s)->this_hdr.sh_type == SHT_RELA) | |
823 | && elf_section_data (s)->this_hdr.sh_info > 0) | |
824 | { | |
825 | unsigned long targ_index; | |
826 | asection *targ_sec; | |
827 | ||
828 | targ_index = elf_section_data (s)->this_hdr.sh_info; | |
829 | targ_sec = bfd_section_from_elf_index (abfd, targ_index); | |
830 | if (targ_sec != NULL | |
831 | && (targ_sec->flags & SEC_DEBUGGING) != 0) | |
832 | s->flags |= SEC_DEBUGGING; | |
833 | } | |
834 | } | |
835 | ||
e84d6fca AM |
836 | bfd_preserve_finish (abfd, &preserve); |
837 | return abfd->xvec; | |
252b5132 RH |
838 | |
839 | got_wrong_format_error: | |
a77a9fef HPN |
840 | /* There is way too much undoing of half-known state here. The caller, |
841 | bfd_check_format_matches, really shouldn't iterate on live bfd's to | |
842 | check match/no-match like it does. We have to rely on that a call to | |
843 | bfd_default_set_arch_mach with the previously known mach, undoes what | |
844 | was done by the first bfd_default_set_arch_mach (with mach 0) here. | |
845 | For this to work, only elf-data and the mach may be changed by the | |
846 | target-specific elf_backend_object_p function. Note that saving the | |
847 | whole bfd here and restoring it would be even worse; the first thing | |
848 | you notice is that the cached bfd file position gets out of sync. */ | |
252b5132 | 849 | bfd_set_error (bfd_error_wrong_format); |
ed591155 | 850 | |
252b5132 | 851 | got_no_match: |
e84d6fca AM |
852 | if (preserve.marker != NULL) |
853 | bfd_preserve_restore (abfd, &preserve); | |
ed591155 | 854 | return NULL; |
252b5132 RH |
855 | } |
856 | \f | |
857 | /* ELF .o/exec file writing */ | |
858 | ||
859 | /* Write out the relocs. */ | |
860 | ||
b9f66672 | 861 | void |
268b6b39 | 862 | elf_write_relocs (bfd *abfd, asection *sec, void *data) |
252b5132 | 863 | { |
268b6b39 | 864 | bfd_boolean *failedp = data; |
252b5132 | 865 | Elf_Internal_Shdr *rela_hdr; |
947216bf | 866 | bfd_vma addr_offset; |
c39a58e6 | 867 | void (*swap_out) (bfd *, const Elf_Internal_Rela *, bfd_byte *); |
947216bf AM |
868 | size_t extsize; |
869 | bfd_byte *dst_rela; | |
252b5132 | 870 | unsigned int idx; |
947216bf AM |
871 | asymbol *last_sym; |
872 | int last_sym_idx; | |
252b5132 RH |
873 | |
874 | /* If we have already failed, don't do anything. */ | |
875 | if (*failedp) | |
876 | return; | |
877 | ||
878 | if ((sec->flags & SEC_RELOC) == 0) | |
879 | return; | |
880 | ||
881 | /* The linker backend writes the relocs out itself, and sets the | |
882 | reloc_count field to zero to inhibit writing them here. Also, | |
883 | sometimes the SEC_RELOC flag gets set even when there aren't any | |
884 | relocs. */ | |
885 | if (sec->reloc_count == 0) | |
886 | return; | |
887 | ||
9a44bbd9 DJ |
888 | /* If we have opened an existing file for update, reloc_count may be |
889 | set even though we are not linking. In that case we have nothing | |
890 | to do. */ | |
891 | if (sec->orelocation == NULL) | |
892 | return; | |
893 | ||
252b5132 RH |
894 | rela_hdr = &elf_section_data (sec)->rel_hdr; |
895 | ||
896 | rela_hdr->sh_size = rela_hdr->sh_entsize * sec->reloc_count; | |
268b6b39 | 897 | rela_hdr->contents = bfd_alloc (abfd, rela_hdr->sh_size); |
252b5132 RH |
898 | if (rela_hdr->contents == NULL) |
899 | { | |
b34976b6 | 900 | *failedp = TRUE; |
252b5132 RH |
901 | return; |
902 | } | |
903 | ||
bf572ba0 MM |
904 | /* Figure out whether the relocations are RELA or REL relocations. */ |
905 | if (rela_hdr->sh_type == SHT_RELA) | |
947216bf AM |
906 | { |
907 | swap_out = elf_swap_reloca_out; | |
908 | extsize = sizeof (Elf_External_Rela); | |
909 | } | |
bf572ba0 | 910 | else if (rela_hdr->sh_type == SHT_REL) |
947216bf AM |
911 | { |
912 | swap_out = elf_swap_reloc_out; | |
913 | extsize = sizeof (Elf_External_Rel); | |
914 | } | |
bf572ba0 MM |
915 | else |
916 | /* Every relocation section should be either an SHT_RELA or an | |
917 | SHT_REL section. */ | |
918 | abort (); | |
919 | ||
947216bf AM |
920 | /* The address of an ELF reloc is section relative for an object |
921 | file, and absolute for an executable file or shared library. | |
922 | The address of a BFD reloc is always section relative. */ | |
923 | addr_offset = 0; | |
924 | if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0) | |
925 | addr_offset = sec->vma; | |
926 | ||
3e932841 | 927 | /* orelocation has the data, reloc_count has the count... */ |
947216bf AM |
928 | last_sym = 0; |
929 | last_sym_idx = 0; | |
930 | dst_rela = rela_hdr->contents; | |
252b5132 | 931 | |
947216bf AM |
932 | for (idx = 0; idx < sec->reloc_count; idx++, dst_rela += extsize) |
933 | { | |
934 | Elf_Internal_Rela src_rela; | |
935 | arelent *ptr; | |
936 | asymbol *sym; | |
937 | int n; | |
938 | ||
939 | ptr = sec->orelocation[idx]; | |
940 | sym = *ptr->sym_ptr_ptr; | |
941 | if (sym == last_sym) | |
942 | n = last_sym_idx; | |
943 | else if (bfd_is_abs_section (sym->section) && sym->value == 0) | |
944 | n = STN_UNDEF; | |
945 | else | |
252b5132 | 946 | { |
947216bf AM |
947 | last_sym = sym; |
948 | n = _bfd_elf_symbol_from_bfd_symbol (abfd, &sym); | |
949 | if (n < 0) | |
252b5132 | 950 | { |
b34976b6 | 951 | *failedp = TRUE; |
252b5132 RH |
952 | return; |
953 | } | |
947216bf | 954 | last_sym_idx = n; |
252b5132 | 955 | } |
252b5132 | 956 | |
947216bf AM |
957 | if ((*ptr->sym_ptr_ptr)->the_bfd != NULL |
958 | && (*ptr->sym_ptr_ptr)->the_bfd->xvec != abfd->xvec | |
959 | && ! _bfd_elf_validate_reloc (abfd, ptr)) | |
252b5132 | 960 | { |
b34976b6 | 961 | *failedp = TRUE; |
947216bf | 962 | return; |
252b5132 | 963 | } |
947216bf AM |
964 | |
965 | src_rela.r_offset = ptr->address + addr_offset; | |
966 | src_rela.r_info = ELF_R_INFO (n, ptr->howto->type); | |
967 | src_rela.r_addend = ptr->addend; | |
968 | (*swap_out) (abfd, &src_rela, dst_rela); | |
252b5132 RH |
969 | } |
970 | } | |
971 | ||
972 | /* Write out the program headers. */ | |
973 | ||
974 | int | |
268b6b39 AM |
975 | elf_write_out_phdrs (bfd *abfd, |
976 | const Elf_Internal_Phdr *phdr, | |
977 | unsigned int count) | |
252b5132 RH |
978 | { |
979 | while (count--) | |
980 | { | |
981 | Elf_External_Phdr extphdr; | |
982 | elf_swap_phdr_out (abfd, phdr, &extphdr); | |
268b6b39 AM |
983 | if (bfd_bwrite (&extphdr, sizeof (Elf_External_Phdr), abfd) |
984 | != sizeof (Elf_External_Phdr)) | |
252b5132 RH |
985 | return -1; |
986 | phdr++; | |
987 | } | |
988 | return 0; | |
989 | } | |
990 | ||
991 | /* Write out the section headers and the ELF file header. */ | |
992 | ||
b34976b6 | 993 | bfd_boolean |
268b6b39 | 994 | elf_write_shdrs_and_ehdr (bfd *abfd) |
252b5132 RH |
995 | { |
996 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ | |
997 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ | |
998 | Elf_External_Shdr *x_shdrp; /* Section header table, external form */ | |
999 | Elf_Internal_Shdr **i_shdrp; /* Section header table, internal form */ | |
1000 | unsigned int count; | |
dc810e39 | 1001 | bfd_size_type amt; |
252b5132 RH |
1002 | |
1003 | i_ehdrp = elf_elfheader (abfd); | |
1004 | i_shdrp = elf_elfsections (abfd); | |
1005 | ||
3e932841 | 1006 | /* swap the header before spitting it out... */ |
252b5132 RH |
1007 | |
1008 | #if DEBUG & 1 | |
1009 | elf_debug_file (i_ehdrp); | |
1010 | #endif | |
1011 | elf_swap_ehdr_out (abfd, i_ehdrp, &x_ehdr); | |
dc810e39 | 1012 | amt = sizeof (x_ehdr); |
252b5132 | 1013 | if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0 |
268b6b39 | 1014 | || bfd_bwrite (&x_ehdr, amt, abfd) != amt) |
b34976b6 | 1015 | return FALSE; |
252b5132 | 1016 | |
5732c114 AM |
1017 | /* Some fields in the first section header handle overflow of ehdr |
1018 | fields. */ | |
1019 | if (i_ehdrp->e_shnum >= SHN_LORESERVE) | |
1020 | i_shdrp[0]->sh_size = i_ehdrp->e_shnum; | |
1021 | if (i_ehdrp->e_shstrndx >= SHN_LORESERVE) | |
1022 | i_shdrp[0]->sh_link = i_ehdrp->e_shstrndx; | |
1023 | ||
3e932841 | 1024 | /* at this point we've concocted all the ELF sections... */ |
5732c114 AM |
1025 | amt = i_ehdrp->e_shnum; |
1026 | amt *= sizeof (*x_shdrp); | |
268b6b39 | 1027 | x_shdrp = bfd_alloc (abfd, amt); |
252b5132 | 1028 | if (!x_shdrp) |
b34976b6 | 1029 | return FALSE; |
252b5132 | 1030 | |
5732c114 | 1031 | for (count = 0; count < i_ehdrp->e_shnum; i_shdrp++, count++) |
252b5132 RH |
1032 | { |
1033 | #if DEBUG & 2 | |
5732c114 | 1034 | elf_debug_section (count, *i_shdrp); |
252b5132 | 1035 | #endif |
5732c114 | 1036 | elf_swap_shdr_out (abfd, *i_shdrp, x_shdrp + count); |
b34976b6 | 1037 | |
5732c114 AM |
1038 | if (count == SHN_LORESERVE - 1) |
1039 | i_shdrp += SHN_HIRESERVE + 1 - SHN_LORESERVE; | |
252b5132 RH |
1040 | } |
1041 | if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_shoff, SEEK_SET) != 0 | |
268b6b39 | 1042 | || bfd_bwrite (x_shdrp, amt, abfd) != amt) |
b34976b6 | 1043 | return FALSE; |
252b5132 | 1044 | |
3e932841 | 1045 | /* need to dump the string table too... */ |
252b5132 | 1046 | |
b34976b6 | 1047 | return TRUE; |
252b5132 RH |
1048 | } |
1049 | ||
1050 | long | |
268b6b39 | 1051 | elf_slurp_symbol_table (bfd *abfd, asymbol **symptrs, bfd_boolean dynamic) |
252b5132 RH |
1052 | { |
1053 | Elf_Internal_Shdr *hdr; | |
1054 | Elf_Internal_Shdr *verhdr; | |
1055 | unsigned long symcount; /* Number of external ELF symbols */ | |
1056 | elf_symbol_type *sym; /* Pointer to current bfd symbol */ | |
1057 | elf_symbol_type *symbase; /* Buffer for generated bfd symbols */ | |
6cdc0ccc AM |
1058 | Elf_Internal_Sym *isym; |
1059 | Elf_Internal_Sym *isymend; | |
1060 | Elf_Internal_Sym *isymbuf = NULL; | |
1061 | Elf_External_Versym *xver; | |
1062 | Elf_External_Versym *xverbuf = NULL; | |
9c5bfbb7 | 1063 | const struct elf_backend_data *ebd; |
dc810e39 | 1064 | bfd_size_type amt; |
252b5132 RH |
1065 | |
1066 | /* Read each raw ELF symbol, converting from external ELF form to | |
1067 | internal ELF form, and then using the information to create a | |
1068 | canonical bfd symbol table entry. | |
1069 | ||
1070 | Note that we allocate the initial bfd canonical symbol buffer | |
1071 | based on a one-to-one mapping of the ELF symbols to canonical | |
1072 | symbols. We actually use all the ELF symbols, so there will be no | |
1073 | space left over at the end. When we have all the symbols, we | |
3e932841 | 1074 | build the caller's pointer vector. */ |
252b5132 RH |
1075 | |
1076 | if (! dynamic) | |
1077 | { | |
1078 | hdr = &elf_tdata (abfd)->symtab_hdr; | |
1079 | verhdr = NULL; | |
1080 | } | |
1081 | else | |
1082 | { | |
1083 | hdr = &elf_tdata (abfd)->dynsymtab_hdr; | |
1084 | if (elf_dynversym (abfd) == 0) | |
1085 | verhdr = NULL; | |
1086 | else | |
1087 | verhdr = &elf_tdata (abfd)->dynversym_hdr; | |
1088 | if ((elf_tdata (abfd)->dynverdef_section != 0 | |
1089 | && elf_tdata (abfd)->verdef == NULL) | |
1090 | || (elf_tdata (abfd)->dynverref_section != 0 | |
1091 | && elf_tdata (abfd)->verref == NULL)) | |
1092 | { | |
fc0e6df6 | 1093 | if (!_bfd_elf_slurp_version_tables (abfd, FALSE)) |
252b5132 RH |
1094 | return -1; |
1095 | } | |
1096 | } | |
1097 | ||
6cdc0ccc | 1098 | ebd = get_elf_backend_data (abfd); |
252b5132 | 1099 | symcount = hdr->sh_size / sizeof (Elf_External_Sym); |
252b5132 RH |
1100 | if (symcount == 0) |
1101 | sym = symbase = NULL; | |
1102 | else | |
1103 | { | |
6cdc0ccc AM |
1104 | isymbuf = bfd_elf_get_elf_syms (abfd, hdr, symcount, 0, |
1105 | NULL, NULL, NULL); | |
1106 | if (isymbuf == NULL) | |
1107 | return -1; | |
252b5132 | 1108 | |
dc810e39 AM |
1109 | amt = symcount; |
1110 | amt *= sizeof (elf_symbol_type); | |
268b6b39 | 1111 | symbase = bfd_zalloc (abfd, amt); |
252b5132 | 1112 | if (symbase == (elf_symbol_type *) NULL) |
9ad5cbcf | 1113 | goto error_return; |
252b5132 RH |
1114 | |
1115 | /* Read the raw ELF version symbol information. */ | |
252b5132 RH |
1116 | if (verhdr != NULL |
1117 | && verhdr->sh_size / sizeof (Elf_External_Versym) != symcount) | |
1118 | { | |
1119 | (*_bfd_error_handler) | |
1120 | (_("%s: version count (%ld) does not match symbol count (%ld)"), | |
1121 | abfd->filename, | |
1122 | (long) (verhdr->sh_size / sizeof (Elf_External_Versym)), | |
1123 | symcount); | |
1124 | ||
1125 | /* Slurp in the symbols without the version information, | |
0560d0f7 | 1126 | since that is more helpful than just quitting. */ |
252b5132 RH |
1127 | verhdr = NULL; |
1128 | } | |
1129 | ||
1130 | if (verhdr != NULL) | |
1131 | { | |
1132 | if (bfd_seek (abfd, verhdr->sh_offset, SEEK_SET) != 0) | |
1133 | goto error_return; | |
1134 | ||
268b6b39 | 1135 | xverbuf = bfd_malloc (verhdr->sh_size); |
6cdc0ccc | 1136 | if (xverbuf == NULL && verhdr->sh_size != 0) |
252b5132 RH |
1137 | goto error_return; |
1138 | ||
268b6b39 | 1139 | if (bfd_bread (xverbuf, verhdr->sh_size, abfd) != verhdr->sh_size) |
252b5132 RH |
1140 | goto error_return; |
1141 | } | |
1142 | ||
1143 | /* Skip first symbol, which is a null dummy. */ | |
6cdc0ccc AM |
1144 | xver = xverbuf; |
1145 | if (xver != NULL) | |
1146 | ++xver; | |
1147 | isymend = isymbuf + symcount; | |
1148 | for (isym = isymbuf + 1, sym = symbase; isym < isymend; isym++, sym++) | |
252b5132 | 1149 | { |
6cdc0ccc | 1150 | memcpy (&sym->internal_elf_sym, isym, sizeof (Elf_Internal_Sym)); |
252b5132 RH |
1151 | sym->symbol.the_bfd = abfd; |
1152 | ||
26c61ae5 | 1153 | sym->symbol.name = bfd_elf_sym_name (abfd, hdr, isym, NULL); |
252b5132 | 1154 | |
6cdc0ccc | 1155 | sym->symbol.value = isym->st_value; |
252b5132 | 1156 | |
6cdc0ccc | 1157 | if (isym->st_shndx == SHN_UNDEF) |
9ad5cbcf AM |
1158 | { |
1159 | sym->symbol.section = bfd_und_section_ptr; | |
1160 | } | |
6cdc0ccc AM |
1161 | else if (isym->st_shndx < SHN_LORESERVE |
1162 | || isym->st_shndx > SHN_HIRESERVE) | |
252b5132 | 1163 | { |
140f6c8e AM |
1164 | sym->symbol.section = bfd_section_from_elf_index (abfd, |
1165 | isym->st_shndx); | |
252b5132 RH |
1166 | if (sym->symbol.section == NULL) |
1167 | { | |
1168 | /* This symbol is in a section for which we did not | |
1169 | create a BFD section. Just use bfd_abs_section, | |
1170 | although it is wrong. FIXME. */ | |
1171 | sym->symbol.section = bfd_abs_section_ptr; | |
1172 | } | |
1173 | } | |
6cdc0ccc | 1174 | else if (isym->st_shndx == SHN_ABS) |
252b5132 RH |
1175 | { |
1176 | sym->symbol.section = bfd_abs_section_ptr; | |
1177 | } | |
6cdc0ccc | 1178 | else if (isym->st_shndx == SHN_COMMON) |
252b5132 RH |
1179 | { |
1180 | sym->symbol.section = bfd_com_section_ptr; | |
1181 | /* Elf puts the alignment into the `value' field, and | |
1182 | the size into the `size' field. BFD wants to see the | |
1183 | size in the value field, and doesn't care (at the | |
1184 | moment) about the alignment. */ | |
6cdc0ccc | 1185 | sym->symbol.value = isym->st_size; |
252b5132 | 1186 | } |
252b5132 RH |
1187 | else |
1188 | sym->symbol.section = bfd_abs_section_ptr; | |
1189 | ||
1049f94e | 1190 | /* If this is a relocatable file, then the symbol value is |
0560d0f7 | 1191 | already section relative. */ |
252b5132 RH |
1192 | if ((abfd->flags & (EXEC_P | DYNAMIC)) != 0) |
1193 | sym->symbol.value -= sym->symbol.section->vma; | |
1194 | ||
6cdc0ccc | 1195 | switch (ELF_ST_BIND (isym->st_info)) |
252b5132 RH |
1196 | { |
1197 | case STB_LOCAL: | |
1198 | sym->symbol.flags |= BSF_LOCAL; | |
1199 | break; | |
1200 | case STB_GLOBAL: | |
6cdc0ccc | 1201 | if (isym->st_shndx != SHN_UNDEF && isym->st_shndx != SHN_COMMON) |
252b5132 RH |
1202 | sym->symbol.flags |= BSF_GLOBAL; |
1203 | break; | |
1204 | case STB_WEAK: | |
1205 | sym->symbol.flags |= BSF_WEAK; | |
1206 | break; | |
1207 | } | |
1208 | ||
6cdc0ccc | 1209 | switch (ELF_ST_TYPE (isym->st_info)) |
252b5132 RH |
1210 | { |
1211 | case STT_SECTION: | |
1212 | sym->symbol.flags |= BSF_SECTION_SYM | BSF_DEBUGGING; | |
1213 | break; | |
1214 | case STT_FILE: | |
1215 | sym->symbol.flags |= BSF_FILE | BSF_DEBUGGING; | |
1216 | break; | |
1217 | case STT_FUNC: | |
1218 | sym->symbol.flags |= BSF_FUNCTION; | |
1219 | break; | |
1220 | case STT_OBJECT: | |
1221 | sym->symbol.flags |= BSF_OBJECT; | |
1222 | break; | |
0be9069d L |
1223 | case STT_TLS: |
1224 | sym->symbol.flags |= BSF_THREAD_LOCAL; | |
1225 | break; | |
252b5132 RH |
1226 | } |
1227 | ||
1228 | if (dynamic) | |
1229 | sym->symbol.flags |= BSF_DYNAMIC; | |
1230 | ||
6cdc0ccc | 1231 | if (xver != NULL) |
252b5132 RH |
1232 | { |
1233 | Elf_Internal_Versym iversym; | |
1234 | ||
6cdc0ccc | 1235 | _bfd_elf_swap_versym_in (abfd, xver, &iversym); |
252b5132 | 1236 | sym->version = iversym.vs_vers; |
6cdc0ccc | 1237 | xver++; |
252b5132 RH |
1238 | } |
1239 | ||
1240 | /* Do some backend-specific processing on this symbol. */ | |
6cdc0ccc AM |
1241 | if (ebd->elf_backend_symbol_processing) |
1242 | (*ebd->elf_backend_symbol_processing) (abfd, &sym->symbol); | |
252b5132 RH |
1243 | } |
1244 | } | |
1245 | ||
1246 | /* Do some backend-specific processing on this symbol table. */ | |
6cdc0ccc AM |
1247 | if (ebd->elf_backend_symbol_table_processing) |
1248 | (*ebd->elf_backend_symbol_table_processing) (abfd, symbase, symcount); | |
252b5132 RH |
1249 | |
1250 | /* We rely on the zalloc to clear out the final symbol entry. */ | |
1251 | ||
1252 | symcount = sym - symbase; | |
1253 | ||
1254 | /* Fill in the user's symbol pointer vector if needed. */ | |
1255 | if (symptrs) | |
1256 | { | |
1257 | long l = symcount; | |
1258 | ||
1259 | sym = symbase; | |
1260 | while (l-- > 0) | |
1261 | { | |
1262 | *symptrs++ = &sym->symbol; | |
1263 | sym++; | |
1264 | } | |
1265 | *symptrs = 0; /* Final null pointer */ | |
1266 | } | |
1267 | ||
6cdc0ccc AM |
1268 | if (xverbuf != NULL) |
1269 | free (xverbuf); | |
1270 | if (isymbuf != NULL && hdr->contents != (unsigned char *) isymbuf) | |
1271 | free (isymbuf); | |
252b5132 | 1272 | return symcount; |
9ad5cbcf | 1273 | |
252b5132 | 1274 | error_return: |
6cdc0ccc AM |
1275 | if (xverbuf != NULL) |
1276 | free (xverbuf); | |
1277 | if (isymbuf != NULL && hdr->contents != (unsigned char *) isymbuf) | |
1278 | free (isymbuf); | |
252b5132 RH |
1279 | return -1; |
1280 | } | |
1281 | ||
5c799c07 | 1282 | /* Read relocations for ASECT from REL_HDR. There are RELOC_COUNT of |
42fdc509 | 1283 | them. */ |
252b5132 | 1284 | |
b34976b6 | 1285 | static bfd_boolean |
268b6b39 AM |
1286 | elf_slurp_reloc_table_from_section (bfd *abfd, |
1287 | asection *asect, | |
1288 | Elf_Internal_Shdr *rel_hdr, | |
1289 | bfd_size_type reloc_count, | |
1290 | arelent *relents, | |
1291 | asymbol **symbols, | |
1292 | bfd_boolean dynamic) | |
252b5132 | 1293 | { |
9c5bfbb7 | 1294 | const struct elf_backend_data * const ebd = get_elf_backend_data (abfd); |
268b6b39 | 1295 | void *allocated = NULL; |
252b5132 | 1296 | bfd_byte *native_relocs; |
252b5132 RH |
1297 | arelent *relent; |
1298 | unsigned int i; | |
1299 | int entsize; | |
5ad8645c | 1300 | unsigned int symcount; |
252b5132 | 1301 | |
268b6b39 | 1302 | allocated = bfd_malloc (rel_hdr->sh_size); |
252b5132 RH |
1303 | if (allocated == NULL) |
1304 | goto error_return; | |
1305 | ||
1306 | if (bfd_seek (abfd, rel_hdr->sh_offset, SEEK_SET) != 0 | |
dc810e39 | 1307 | || (bfd_bread (allocated, rel_hdr->sh_size, abfd) |
252b5132 RH |
1308 | != rel_hdr->sh_size)) |
1309 | goto error_return; | |
1310 | ||
268b6b39 | 1311 | native_relocs = allocated; |
252b5132 | 1312 | |
252b5132 RH |
1313 | entsize = rel_hdr->sh_entsize; |
1314 | BFD_ASSERT (entsize == sizeof (Elf_External_Rel) | |
1315 | || entsize == sizeof (Elf_External_Rela)); | |
1316 | ||
5ad8645c AM |
1317 | if (dynamic) |
1318 | symcount = bfd_get_dynamic_symcount (abfd); | |
1319 | else | |
1320 | symcount = bfd_get_symcount (abfd); | |
1321 | ||
252b5132 RH |
1322 | for (i = 0, relent = relents; |
1323 | i < reloc_count; | |
1324 | i++, relent++, native_relocs += entsize) | |
1325 | { | |
1326 | Elf_Internal_Rela rela; | |
252b5132 RH |
1327 | |
1328 | if (entsize == sizeof (Elf_External_Rela)) | |
947216bf | 1329 | elf_swap_reloca_in (abfd, native_relocs, &rela); |
252b5132 | 1330 | else |
947216bf | 1331 | elf_swap_reloc_in (abfd, native_relocs, &rela); |
252b5132 RH |
1332 | |
1333 | /* The address of an ELF reloc is section relative for an object | |
1334 | file, and absolute for an executable file or shared library. | |
1335 | The address of a normal BFD reloc is always section relative, | |
1336 | and the address of a dynamic reloc is absolute.. */ | |
1337 | if ((abfd->flags & (EXEC_P | DYNAMIC)) == 0 || dynamic) | |
1338 | relent->address = rela.r_offset; | |
1339 | else | |
1340 | relent->address = rela.r_offset - asect->vma; | |
1341 | ||
1342 | if (ELF_R_SYM (rela.r_info) == 0) | |
1343 | relent->sym_ptr_ptr = bfd_abs_section_ptr->symbol_ptr_ptr; | |
05a487dc | 1344 | else if (ELF_R_SYM (rela.r_info) > symcount) |
1f70368c DJ |
1345 | { |
1346 | (*_bfd_error_handler) | |
1347 | (_("%s(%s): relocation %d has invalid symbol index %ld"), | |
1348 | abfd->filename, asect->name, i, ELF_R_SYM (rela.r_info)); | |
1349 | relent->sym_ptr_ptr = bfd_abs_section.symbol_ptr_ptr; | |
1350 | } | |
252b5132 RH |
1351 | else |
1352 | { | |
b48c61bc | 1353 | asymbol **ps; |
252b5132 | 1354 | ps = symbols + ELF_R_SYM (rela.r_info) - 1; |
252b5132 | 1355 | |
f9cfae62 | 1356 | relent->sym_ptr_ptr = ps; |
252b5132 RH |
1357 | } |
1358 | ||
1359 | relent->addend = rela.r_addend; | |
1360 | ||
90fff0d4 DJ |
1361 | if ((entsize == sizeof (Elf_External_Rela) |
1362 | && ebd->elf_info_to_howto != NULL) | |
1363 | || ebd->elf_info_to_howto_rel == NULL) | |
252b5132 RH |
1364 | (*ebd->elf_info_to_howto) (abfd, relent, &rela); |
1365 | else | |
947216bf | 1366 | (*ebd->elf_info_to_howto_rel) (abfd, relent, &rela); |
252b5132 RH |
1367 | } |
1368 | ||
252b5132 RH |
1369 | if (allocated != NULL) |
1370 | free (allocated); | |
1371 | ||
b34976b6 | 1372 | return TRUE; |
252b5132 RH |
1373 | |
1374 | error_return: | |
1375 | if (allocated != NULL) | |
1376 | free (allocated); | |
b34976b6 | 1377 | return FALSE; |
252b5132 RH |
1378 | } |
1379 | ||
42fdc509 MM |
1380 | /* Read in and swap the external relocs. */ |
1381 | ||
b34976b6 | 1382 | bfd_boolean |
268b6b39 AM |
1383 | elf_slurp_reloc_table (bfd *abfd, |
1384 | asection *asect, | |
1385 | asymbol **symbols, | |
1386 | bfd_boolean dynamic) | |
42fdc509 MM |
1387 | { |
1388 | struct bfd_elf_section_data * const d = elf_section_data (asect); | |
1389 | Elf_Internal_Shdr *rel_hdr; | |
1390 | Elf_Internal_Shdr *rel_hdr2; | |
1391 | bfd_size_type reloc_count; | |
1392 | bfd_size_type reloc_count2; | |
1393 | arelent *relents; | |
dc810e39 | 1394 | bfd_size_type amt; |
42fdc509 MM |
1395 | |
1396 | if (asect->relocation != NULL) | |
b34976b6 | 1397 | return TRUE; |
42fdc509 MM |
1398 | |
1399 | if (! dynamic) | |
1400 | { | |
1401 | if ((asect->flags & SEC_RELOC) == 0 | |
1402 | || asect->reloc_count == 0) | |
b34976b6 | 1403 | return TRUE; |
42fdc509 MM |
1404 | |
1405 | rel_hdr = &d->rel_hdr; | |
d9bc7a44 | 1406 | reloc_count = NUM_SHDR_ENTRIES (rel_hdr); |
42fdc509 | 1407 | rel_hdr2 = d->rel_hdr2; |
d9bc7a44 | 1408 | reloc_count2 = (rel_hdr2 ? NUM_SHDR_ENTRIES (rel_hdr2) : 0); |
42fdc509 MM |
1409 | |
1410 | BFD_ASSERT (asect->reloc_count == reloc_count + reloc_count2); | |
1411 | BFD_ASSERT (asect->rel_filepos == rel_hdr->sh_offset | |
1412 | || (rel_hdr2 && asect->rel_filepos == rel_hdr2->sh_offset)); | |
1413 | ||
1414 | } | |
1415 | else | |
1416 | { | |
57e21bef MM |
1417 | /* Note that ASECT->RELOC_COUNT tends not to be accurate in this |
1418 | case because relocations against this section may use the | |
1419 | dynamic symbol table, and in that case bfd_section_from_shdr | |
1420 | in elf.c does not update the RELOC_COUNT. */ | |
eea6121a | 1421 | if (asect->size == 0) |
b34976b6 | 1422 | return TRUE; |
42fdc509 MM |
1423 | |
1424 | rel_hdr = &d->this_hdr; | |
d9bc7a44 | 1425 | reloc_count = NUM_SHDR_ENTRIES (rel_hdr); |
42fdc509 | 1426 | rel_hdr2 = NULL; |
57e21bef | 1427 | reloc_count2 = 0; |
42fdc509 MM |
1428 | } |
1429 | ||
dc810e39 | 1430 | amt = (reloc_count + reloc_count2) * sizeof (arelent); |
268b6b39 | 1431 | relents = bfd_alloc (abfd, amt); |
42fdc509 | 1432 | if (relents == NULL) |
b34976b6 | 1433 | return FALSE; |
42fdc509 MM |
1434 | |
1435 | if (!elf_slurp_reloc_table_from_section (abfd, asect, | |
1436 | rel_hdr, reloc_count, | |
1437 | relents, | |
1438 | symbols, dynamic)) | |
b34976b6 | 1439 | return FALSE; |
60bcf0fa NC |
1440 | |
1441 | if (rel_hdr2 | |
42fdc509 MM |
1442 | && !elf_slurp_reloc_table_from_section (abfd, asect, |
1443 | rel_hdr2, reloc_count2, | |
1444 | relents + reloc_count, | |
1445 | symbols, dynamic)) | |
b34976b6 | 1446 | return FALSE; |
42fdc509 | 1447 | |
42fdc509 | 1448 | asect->relocation = relents; |
b34976b6 | 1449 | return TRUE; |
42fdc509 MM |
1450 | } |
1451 | ||
e460dd0d | 1452 | #if DEBUG & 2 |
252b5132 | 1453 | static void |
268b6b39 | 1454 | elf_debug_section (int num, Elf_Internal_Shdr *hdr) |
252b5132 RH |
1455 | { |
1456 | fprintf (stderr, "\nSection#%d '%s' 0x%.8lx\n", num, | |
1457 | hdr->bfd_section != NULL ? hdr->bfd_section->name : "", | |
1458 | (long) hdr); | |
1459 | fprintf (stderr, | |
1460 | "sh_name = %ld\tsh_type = %ld\tsh_flags = %ld\n", | |
1461 | (long) hdr->sh_name, | |
1462 | (long) hdr->sh_type, | |
1463 | (long) hdr->sh_flags); | |
1464 | fprintf (stderr, | |
1465 | "sh_addr = %ld\tsh_offset = %ld\tsh_size = %ld\n", | |
1466 | (long) hdr->sh_addr, | |
1467 | (long) hdr->sh_offset, | |
1468 | (long) hdr->sh_size); | |
1469 | fprintf (stderr, | |
1470 | "sh_link = %ld\tsh_info = %ld\tsh_addralign = %ld\n", | |
1471 | (long) hdr->sh_link, | |
1472 | (long) hdr->sh_info, | |
1473 | (long) hdr->sh_addralign); | |
1474 | fprintf (stderr, "sh_entsize = %ld\n", | |
1475 | (long) hdr->sh_entsize); | |
1476 | fflush (stderr); | |
1477 | } | |
e460dd0d | 1478 | #endif |
252b5132 | 1479 | |
e460dd0d | 1480 | #if DEBUG & 1 |
252b5132 | 1481 | static void |
268b6b39 | 1482 | elf_debug_file (Elf_Internal_Ehdr *ehdrp) |
252b5132 RH |
1483 | { |
1484 | fprintf (stderr, "e_entry = 0x%.8lx\n", (long) ehdrp->e_entry); | |
1485 | fprintf (stderr, "e_phoff = %ld\n", (long) ehdrp->e_phoff); | |
1486 | fprintf (stderr, "e_phnum = %ld\n", (long) ehdrp->e_phnum); | |
1487 | fprintf (stderr, "e_phentsize = %ld\n", (long) ehdrp->e_phentsize); | |
1488 | fprintf (stderr, "e_shoff = %ld\n", (long) ehdrp->e_shoff); | |
1489 | fprintf (stderr, "e_shnum = %ld\n", (long) ehdrp->e_shnum); | |
1490 | fprintf (stderr, "e_shentsize = %ld\n", (long) ehdrp->e_shentsize); | |
1491 | } | |
252b5132 RH |
1492 | #endif |
1493 | \f | |
8d6337fe RM |
1494 | /* Create a new BFD as if by bfd_openr. Rather than opening a file, |
1495 | reconstruct an ELF file by reading the segments out of remote memory | |
1496 | based on the ELF file header at EHDR_VMA and the ELF program headers it | |
1497 | points to. If not null, *LOADBASEP is filled in with the difference | |
1498 | between the VMAs from which the segments were read, and the VMAs the | |
1499 | file headers (and hence BFD's idea of each section's VMA) put them at. | |
1500 | ||
1501 | The function TARGET_READ_MEMORY is called to copy LEN bytes from the | |
1502 | remote memory at target address VMA into the local buffer at MYADDR; it | |
1503 | should return zero on success or an `errno' code on failure. TEMPL must | |
1504 | be a BFD for a target with the word size and byte order found in the | |
1505 | remote memory. */ | |
1506 | ||
1507 | bfd * | |
268b6b39 AM |
1508 | NAME(_bfd_elf,bfd_from_remote_memory) |
1509 | (bfd *templ, | |
1510 | bfd_vma ehdr_vma, | |
1511 | bfd_vma *loadbasep, | |
f075ee0c | 1512 | int (*target_read_memory) (bfd_vma, bfd_byte *, int)) |
8d6337fe RM |
1513 | { |
1514 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ | |
1515 | Elf_Internal_Ehdr i_ehdr; /* Elf file header, internal form */ | |
1516 | Elf_External_Phdr *x_phdrs; | |
1517 | Elf_Internal_Phdr *i_phdrs, *last_phdr; | |
1518 | bfd *nbfd; | |
1519 | struct bfd_in_memory *bim; | |
1520 | int contents_size; | |
f075ee0c | 1521 | bfd_byte *contents; |
8d6337fe RM |
1522 | int err; |
1523 | unsigned int i; | |
1524 | bfd_vma loadbase; | |
1525 | ||
1526 | /* Read in the ELF header in external format. */ | |
f075ee0c | 1527 | err = target_read_memory (ehdr_vma, (bfd_byte *) &x_ehdr, sizeof x_ehdr); |
8d6337fe RM |
1528 | if (err) |
1529 | { | |
1530 | bfd_set_error (bfd_error_system_call); | |
1531 | errno = err; | |
1532 | return NULL; | |
1533 | } | |
1534 | ||
1535 | /* Now check to see if we have a valid ELF file, and one that BFD can | |
1536 | make use of. The magic number must match, the address size ('class') | |
1537 | and byte-swapping must match our XVEC entry. */ | |
1538 | ||
1539 | if (! elf_file_p (&x_ehdr) | |
1540 | || x_ehdr.e_ident[EI_VERSION] != EV_CURRENT | |
1541 | || x_ehdr.e_ident[EI_CLASS] != ELFCLASS) | |
1542 | { | |
1543 | bfd_set_error (bfd_error_wrong_format); | |
1544 | return NULL; | |
1545 | } | |
1546 | ||
1547 | /* Check that file's byte order matches xvec's */ | |
1548 | switch (x_ehdr.e_ident[EI_DATA]) | |
1549 | { | |
1550 | case ELFDATA2MSB: /* Big-endian */ | |
1551 | if (! bfd_header_big_endian (templ)) | |
1552 | { | |
1553 | bfd_set_error (bfd_error_wrong_format); | |
1554 | return NULL; | |
1555 | } | |
1556 | break; | |
1557 | case ELFDATA2LSB: /* Little-endian */ | |
1558 | if (! bfd_header_little_endian (templ)) | |
1559 | { | |
1560 | bfd_set_error (bfd_error_wrong_format); | |
1561 | return NULL; | |
1562 | } | |
1563 | break; | |
1564 | case ELFDATANONE: /* No data encoding specified */ | |
1565 | default: /* Unknown data encoding specified */ | |
1566 | bfd_set_error (bfd_error_wrong_format); | |
1567 | return NULL; | |
1568 | } | |
1569 | ||
1570 | elf_swap_ehdr_in (templ, &x_ehdr, &i_ehdr); | |
1571 | ||
1572 | /* The file header tells where to find the program headers. | |
1573 | These are what we use to actually choose what to read. */ | |
1574 | ||
1575 | if (i_ehdr.e_phentsize != sizeof (Elf_External_Phdr) || i_ehdr.e_phnum == 0) | |
1576 | { | |
1577 | bfd_set_error (bfd_error_wrong_format); | |
1578 | return NULL; | |
1579 | } | |
1580 | ||
268b6b39 | 1581 | x_phdrs = bfd_malloc (i_ehdr.e_phnum * (sizeof *x_phdrs + sizeof *i_phdrs)); |
8d6337fe RM |
1582 | if (x_phdrs == NULL) |
1583 | { | |
1584 | bfd_set_error (bfd_error_no_memory); | |
1585 | return NULL; | |
1586 | } | |
f075ee0c | 1587 | err = target_read_memory (ehdr_vma + i_ehdr.e_phoff, (bfd_byte *) x_phdrs, |
8d6337fe RM |
1588 | i_ehdr.e_phnum * sizeof x_phdrs[0]); |
1589 | if (err) | |
1590 | { | |
1591 | free (x_phdrs); | |
1592 | bfd_set_error (bfd_error_system_call); | |
1593 | errno = err; | |
1594 | return NULL; | |
1595 | } | |
1596 | i_phdrs = (Elf_Internal_Phdr *) &x_phdrs[i_ehdr.e_phnum]; | |
1597 | ||
1598 | contents_size = 0; | |
1599 | last_phdr = NULL; | |
1600 | loadbase = ehdr_vma; | |
1601 | for (i = 0; i < i_ehdr.e_phnum; ++i) | |
1602 | { | |
1603 | elf_swap_phdr_in (templ, &x_phdrs[i], &i_phdrs[i]); | |
653bb2de JW |
1604 | /* IA-64 vDSO may have two mappings for one segment, where one mapping |
1605 | is executable only, and one is read only. We must not use the | |
1606 | executable one. */ | |
1607 | if (i_phdrs[i].p_type == PT_LOAD && (i_phdrs[i].p_flags & PF_R)) | |
8d6337fe RM |
1608 | { |
1609 | bfd_vma segment_end; | |
1610 | segment_end = (i_phdrs[i].p_offset + i_phdrs[i].p_filesz | |
1611 | + i_phdrs[i].p_align - 1) & -i_phdrs[i].p_align; | |
1612 | if (segment_end > (bfd_vma) contents_size) | |
1613 | contents_size = segment_end; | |
1614 | ||
1615 | if ((i_phdrs[i].p_offset & -i_phdrs[i].p_align) == 0) | |
1616 | loadbase = ehdr_vma - (i_phdrs[i].p_vaddr & -i_phdrs[i].p_align); | |
1617 | ||
1618 | last_phdr = &i_phdrs[i]; | |
1619 | } | |
1620 | } | |
1621 | if (last_phdr == NULL) | |
1622 | { | |
1623 | /* There were no PT_LOAD segments, so we don't have anything to read. */ | |
1624 | free (x_phdrs); | |
1625 | bfd_set_error (bfd_error_wrong_format); | |
1626 | return NULL; | |
1627 | } | |
1628 | ||
1629 | /* Trim the last segment so we don't bother with zeros in the last page | |
1630 | that are off the end of the file. However, if the extra bit in that | |
1631 | page includes the section headers, keep them. */ | |
1632 | if ((bfd_vma) contents_size > last_phdr->p_offset + last_phdr->p_filesz | |
1633 | && (bfd_vma) contents_size >= (i_ehdr.e_shoff | |
1634 | + i_ehdr.e_shnum * i_ehdr.e_shentsize)) | |
1635 | { | |
1636 | contents_size = last_phdr->p_offset + last_phdr->p_filesz; | |
1637 | if ((bfd_vma) contents_size < (i_ehdr.e_shoff | |
1638 | + i_ehdr.e_shnum * i_ehdr.e_shentsize)) | |
1639 | contents_size = i_ehdr.e_shoff + i_ehdr.e_shnum * i_ehdr.e_shentsize; | |
1640 | } | |
1641 | else | |
1642 | contents_size = last_phdr->p_offset + last_phdr->p_filesz; | |
1643 | ||
1644 | /* Now we know the size of the whole image we want read in. */ | |
268b6b39 | 1645 | contents = bfd_zmalloc (contents_size); |
8d6337fe RM |
1646 | if (contents == NULL) |
1647 | { | |
1648 | free (x_phdrs); | |
1649 | bfd_set_error (bfd_error_no_memory); | |
1650 | return NULL; | |
1651 | } | |
1652 | ||
1653 | for (i = 0; i < i_ehdr.e_phnum; ++i) | |
653bb2de JW |
1654 | /* IA-64 vDSO may have two mappings for one segment, where one mapping |
1655 | is executable only, and one is read only. We must not use the | |
1656 | executable one. */ | |
1657 | if (i_phdrs[i].p_type == PT_LOAD && (i_phdrs[i].p_flags & PF_R)) | |
8d6337fe RM |
1658 | { |
1659 | bfd_vma start = i_phdrs[i].p_offset & -i_phdrs[i].p_align; | |
1660 | bfd_vma end = (i_phdrs[i].p_offset + i_phdrs[i].p_filesz | |
1661 | + i_phdrs[i].p_align - 1) & -i_phdrs[i].p_align; | |
1662 | if (end > (bfd_vma) contents_size) | |
1663 | end = contents_size; | |
1664 | err = target_read_memory ((loadbase + i_phdrs[i].p_vaddr) | |
1665 | & -i_phdrs[i].p_align, | |
1666 | contents + start, end - start); | |
1667 | if (err) | |
1668 | { | |
1669 | free (x_phdrs); | |
1670 | free (contents); | |
1671 | bfd_set_error (bfd_error_system_call); | |
1672 | errno = err; | |
1673 | return NULL; | |
1674 | } | |
1675 | } | |
1676 | free (x_phdrs); | |
1677 | ||
1678 | /* If the segments visible in memory didn't include the section headers, | |
1679 | then clear them from the file header. */ | |
1680 | if ((bfd_vma) contents_size < (i_ehdr.e_shoff | |
1681 | + i_ehdr.e_shnum * i_ehdr.e_shentsize)) | |
1682 | { | |
1683 | memset (&x_ehdr.e_shoff, 0, sizeof x_ehdr.e_shoff); | |
1684 | memset (&x_ehdr.e_shnum, 0, sizeof x_ehdr.e_shnum); | |
1685 | memset (&x_ehdr.e_shstrndx, 0, sizeof x_ehdr.e_shstrndx); | |
1686 | } | |
1687 | ||
1688 | /* This will normally have been in the first PT_LOAD segment. But it | |
1689 | conceivably could be missing, and we might have just changed it. */ | |
1690 | memcpy (contents, &x_ehdr, sizeof x_ehdr); | |
1691 | ||
1692 | /* Now we have a memory image of the ELF file contents. Make a BFD. */ | |
268b6b39 | 1693 | bim = bfd_malloc (sizeof (struct bfd_in_memory)); |
8d6337fe RM |
1694 | if (bim == NULL) |
1695 | { | |
1696 | free (contents); | |
1697 | bfd_set_error (bfd_error_no_memory); | |
1698 | return NULL; | |
1699 | } | |
1700 | nbfd = _bfd_new_bfd (); | |
1701 | if (nbfd == NULL) | |
1702 | { | |
1703 | free (bim); | |
1704 | free (contents); | |
1705 | bfd_set_error (bfd_error_no_memory); | |
1706 | return NULL; | |
1707 | } | |
1708 | nbfd->filename = "<in-memory>"; | |
1709 | nbfd->xvec = templ->xvec; | |
1710 | bim->size = contents_size; | |
1711 | bim->buffer = contents; | |
268b6b39 | 1712 | nbfd->iostream = bim; |
8d6337fe RM |
1713 | nbfd->flags = BFD_IN_MEMORY; |
1714 | nbfd->direction = read_direction; | |
1715 | nbfd->mtime = time (NULL); | |
1716 | nbfd->mtime_set = TRUE; | |
1717 | ||
1718 | if (loadbasep) | |
1719 | *loadbasep = loadbase; | |
1720 | return nbfd; | |
1721 | } | |
1722 | \f | |
252b5132 | 1723 | #include "elfcore.h" |
252b5132 RH |
1724 | \f |
1725 | /* Size-dependent data and functions. */ | |
1726 | const struct elf_size_info NAME(_bfd_elf,size_info) = { | |
1727 | sizeof (Elf_External_Ehdr), | |
1728 | sizeof (Elf_External_Phdr), | |
1729 | sizeof (Elf_External_Shdr), | |
1730 | sizeof (Elf_External_Rel), | |
1731 | sizeof (Elf_External_Rela), | |
1732 | sizeof (Elf_External_Sym), | |
1733 | sizeof (Elf_External_Dyn), | |
1734 | sizeof (Elf_External_Note), | |
70bcb145 | 1735 | 4, |
c7ac6ff8 | 1736 | 1, |
45d6a902 | 1737 | ARCH_SIZE, LOG_FILE_ALIGN, |
252b5132 RH |
1738 | ELFCLASS, EV_CURRENT, |
1739 | elf_write_out_phdrs, | |
1740 | elf_write_shdrs_and_ehdr, | |
b9f66672 | 1741 | elf_write_relocs, |
73ff0d56 | 1742 | elf_swap_symbol_in, |
252b5132 RH |
1743 | elf_swap_symbol_out, |
1744 | elf_slurp_reloc_table, | |
1745 | elf_slurp_symbol_table, | |
c7ac6ff8 MM |
1746 | elf_swap_dyn_in, |
1747 | elf_swap_dyn_out, | |
947216bf AM |
1748 | elf_swap_reloc_in, |
1749 | elf_swap_reloc_out, | |
1750 | elf_swap_reloca_in, | |
1751 | elf_swap_reloca_out | |
252b5132 | 1752 | }; |