Commit | Line | Data |
---|---|---|
252b5132 | 1 | /* ELF core file support for BFD. |
536d0ff4 | 2 | Copyright 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2005, 2007, |
ecd12bc1 | 3 | 2008, 2010 Free Software Foundation, Inc. |
252b5132 | 4 | |
3193e234 | 5 | This file is part of BFD, the Binary File Descriptor library. |
252b5132 | 6 | |
3193e234 NC |
7 | This program is free software; you can redistribute it and/or modify |
8 | it under the terms of the GNU General Public License as published by | |
cd123cb7 | 9 | the Free Software Foundation; either version 3 of the License, or |
3193e234 | 10 | (at your option) any later version. |
252b5132 | 11 | |
3193e234 NC |
12 | This program is distributed in the hope that it will be useful, |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
252b5132 | 16 | |
3193e234 NC |
17 | You should have received a copy of the GNU General Public License |
18 | along with this program; if not, write to the Free Software | |
cd123cb7 NC |
19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
20 | MA 02110-1301, USA. */ | |
252b5132 | 21 | |
252b5132 | 22 | char* |
268b6b39 | 23 | elf_core_file_failing_command (bfd *abfd) |
252b5132 | 24 | { |
228e534f | 25 | return elf_tdata (abfd)->core->command; |
252b5132 RH |
26 | } |
27 | ||
28 | int | |
268b6b39 | 29 | elf_core_file_failing_signal (bfd *abfd) |
252b5132 | 30 | { |
228e534f | 31 | return elf_tdata (abfd)->core->signal; |
252b5132 RH |
32 | } |
33 | ||
261b8d08 PA |
34 | int |
35 | elf_core_file_pid (bfd *abfd) | |
36 | { | |
228e534f | 37 | return elf_tdata (abfd)->core->pid; |
261b8d08 PA |
38 | } |
39 | ||
b34976b6 | 40 | bfd_boolean |
268b6b39 | 41 | elf_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd) |
252b5132 RH |
42 | { |
43 | char* corename; | |
44 | ||
3e932841 | 45 | /* xvecs must match if both are ELF files for the same target. */ |
252b5132 RH |
46 | |
47 | if (core_bfd->xvec != exec_bfd->xvec) | |
48 | { | |
49 | bfd_set_error (bfd_error_system_call); | |
b34976b6 | 50 | return FALSE; |
252b5132 RH |
51 | } |
52 | ||
3e932841 | 53 | /* See if the name in the corefile matches the executable name. */ |
228e534f | 54 | corename = elf_tdata (core_bfd)->core->program; |
252b5132 RH |
55 | if (corename != NULL) |
56 | { | |
57 | const char* execname = strrchr (exec_bfd->filename, '/'); | |
3193e234 | 58 | |
252b5132 RH |
59 | execname = execname ? execname + 1 : exec_bfd->filename; |
60 | ||
268b6b39 | 61 | if (strcmp (execname, corename) != 0) |
b34976b6 | 62 | return FALSE; |
252b5132 RH |
63 | } |
64 | ||
b34976b6 | 65 | return TRUE; |
252b5132 RH |
66 | } |
67 | ||
252b5132 RH |
68 | /* Core files are simply standard ELF formatted files that partition |
69 | the file using the execution view of the file (program header table) | |
70 | rather than the linking view. In fact, there is no section header | |
71 | table in a core file. | |
72 | ||
73 | The process status information (including the contents of the general | |
74 | register set) and the floating point register set are stored in a | |
75 | segment of type PT_NOTE. We handcraft a couple of extra bfd sections | |
76 | that allow standard bfd access to the general registers (.reg) and the | |
3193e234 | 77 | floating point registers (.reg2). */ |
252b5132 RH |
78 | |
79 | const bfd_target * | |
268b6b39 | 80 | elf_core_file_p (bfd *abfd) |
252b5132 | 81 | { |
3193e234 NC |
82 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form. */ |
83 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form. */ | |
84 | Elf_Internal_Phdr *i_phdrp; /* Elf program header, internal form. */ | |
252b5132 | 85 | unsigned int phindex; |
9c5bfbb7 | 86 | const struct elf_backend_data *ebd; |
dc810e39 | 87 | bfd_size_type amt; |
252b5132 RH |
88 | |
89 | /* Read in the ELF header in external format. */ | |
268b6b39 | 90 | if (bfd_bread (&x_ehdr, sizeof (x_ehdr), abfd) != sizeof (x_ehdr)) |
252b5132 RH |
91 | { |
92 | if (bfd_get_error () != bfd_error_system_call) | |
a7f84125 AM |
93 | goto wrong; |
94 | else | |
95 | goto fail; | |
252b5132 RH |
96 | } |
97 | ||
3e932841 | 98 | /* Check the magic number. */ |
82e51918 | 99 | if (! elf_file_p (&x_ehdr)) |
60bcf0fa | 100 | goto wrong; |
252b5132 | 101 | |
3193e234 | 102 | /* FIXME: Check EI_VERSION here ! */ |
252b5132 | 103 | |
3e932841 | 104 | /* Check the address size ("class"). */ |
252b5132 RH |
105 | if (x_ehdr.e_ident[EI_CLASS] != ELFCLASS) |
106 | goto wrong; | |
107 | ||
3e932841 | 108 | /* Check the byteorder. */ |
252b5132 RH |
109 | switch (x_ehdr.e_ident[EI_DATA]) |
110 | { | |
3193e234 | 111 | case ELFDATA2MSB: /* Big-endian. */ |
252b5132 RH |
112 | if (! bfd_big_endian (abfd)) |
113 | goto wrong; | |
114 | break; | |
3193e234 | 115 | case ELFDATA2LSB: /* Little-endian. */ |
252b5132 RH |
116 | if (! bfd_little_endian (abfd)) |
117 | goto wrong; | |
118 | break; | |
119 | default: | |
120 | goto wrong; | |
121 | } | |
122 | ||
0c83546a AM |
123 | /* Give abfd an elf_obj_tdata. */ |
124 | if (! (*abfd->xvec->_bfd_set_format[bfd_core]) (abfd)) | |
125 | goto fail; | |
a7f84125 | 126 | |
3e932841 | 127 | /* Swap in the rest of the header, now that we have the byte order. */ |
252b5132 RH |
128 | i_ehdrp = elf_elfheader (abfd); |
129 | elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp); | |
130 | ||
131 | #if DEBUG & 1 | |
132 | elf_debug_file (i_ehdrp); | |
133 | #endif | |
134 | ||
135 | ebd = get_elf_backend_data (abfd); | |
136 | ||
137 | /* Check that the ELF e_machine field matches what this particular | |
138 | BFD format expects. */ | |
139 | ||
140 | if (ebd->elf_machine_code != i_ehdrp->e_machine | |
141 | && (ebd->elf_machine_alt1 == 0 | |
142 | || i_ehdrp->e_machine != ebd->elf_machine_alt1) | |
143 | && (ebd->elf_machine_alt2 == 0 | |
144 | || i_ehdrp->e_machine != ebd->elf_machine_alt2)) | |
145 | { | |
146 | const bfd_target * const *target_ptr; | |
147 | ||
148 | if (ebd->elf_machine_code != EM_NONE) | |
149 | goto wrong; | |
150 | ||
151 | /* This is the generic ELF target. Let it match any ELF target | |
152 | for which we do not have a specific backend. */ | |
153 | ||
154 | for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++) | |
155 | { | |
9c5bfbb7 | 156 | const struct elf_backend_data *back; |
252b5132 RH |
157 | |
158 | if ((*target_ptr)->flavour != bfd_target_elf_flavour) | |
159 | continue; | |
f7231afc | 160 | back = xvec_get_elf_backend_data (*target_ptr); |
11a7ae4f AM |
161 | if (back->s->arch_size != ARCH_SIZE) |
162 | continue; | |
3193e234 NC |
163 | if (back->elf_machine_code == i_ehdrp->e_machine |
164 | || (back->elf_machine_alt1 != 0 | |
165 | && i_ehdrp->e_machine == back->elf_machine_alt1) | |
166 | || (back->elf_machine_alt2 != 0 | |
167 | && i_ehdrp->e_machine == back->elf_machine_alt2)) | |
252b5132 RH |
168 | { |
169 | /* target_ptr is an ELF backend which matches this | |
170 | object file, so reject the generic ELF target. */ | |
171 | goto wrong; | |
172 | } | |
173 | } | |
174 | } | |
175 | ||
176 | /* If there is no program header, or the type is not a core file, then | |
3e932841 | 177 | we are hosed. */ |
252b5132 RH |
178 | if (i_ehdrp->e_phoff == 0 || i_ehdrp->e_type != ET_CORE) |
179 | goto wrong; | |
180 | ||
181 | /* Does BFD's idea of the phdr size match the size | |
182 | recorded in the file? */ | |
183 | if (i_ehdrp->e_phentsize != sizeof (Elf_External_Phdr)) | |
184 | goto wrong; | |
185 | ||
ecd12bc1 AM |
186 | /* If the program header count is PN_XNUM(0xffff), the actual |
187 | count is in the first section header. */ | |
188 | if (i_ehdrp->e_shoff != 0 && i_ehdrp->e_phnum == PN_XNUM) | |
189 | { | |
190 | Elf_External_Shdr x_shdr; | |
191 | Elf_Internal_Shdr i_shdr; | |
192 | bfd_signed_vma where = i_ehdrp->e_shoff; | |
193 | ||
194 | if (where != (file_ptr) where) | |
195 | goto wrong; | |
196 | ||
197 | /* Seek to the section header table in the file. */ | |
198 | if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0) | |
199 | goto fail; | |
200 | ||
201 | /* Read the first section header at index 0, and convert to internal | |
202 | form. */ | |
203 | if (bfd_bread (&x_shdr, sizeof (x_shdr), abfd) != sizeof (x_shdr)) | |
204 | goto fail; | |
205 | elf_swap_shdr_in (abfd, &x_shdr, &i_shdr); | |
206 | ||
207 | if (i_shdr.sh_info != 0) | |
208 | { | |
209 | i_ehdrp->e_phnum = i_shdr.sh_info; | |
210 | if (i_ehdrp->e_phnum != i_shdr.sh_info) | |
211 | goto wrong; | |
212 | } | |
213 | } | |
214 | ||
215 | /* Sanity check that we can read all of the program headers. | |
216 | It ought to be good enough to just read the last one. */ | |
217 | if (i_ehdrp->e_phnum > 1) | |
218 | { | |
219 | Elf_External_Phdr x_phdr; | |
220 | Elf_Internal_Phdr i_phdr; | |
221 | bfd_signed_vma where; | |
222 | ||
223 | /* Check that we don't have a totally silly number of | |
224 | program headers. */ | |
225 | if (i_ehdrp->e_phnum > (unsigned int) -1 / sizeof (x_phdr) | |
226 | || i_ehdrp->e_phnum > (unsigned int) -1 / sizeof (i_phdr)) | |
227 | goto wrong; | |
228 | ||
229 | where = i_ehdrp->e_phoff + (i_ehdrp->e_phnum - 1) * sizeof (x_phdr); | |
230 | if (where != (file_ptr) where) | |
231 | goto wrong; | |
232 | if ((bfd_size_type) where <= i_ehdrp->e_phoff) | |
233 | goto wrong; | |
234 | ||
235 | if (bfd_seek (abfd, (file_ptr) where, SEEK_SET) != 0) | |
236 | goto fail; | |
237 | if (bfd_bread (&x_phdr, sizeof (x_phdr), abfd) != sizeof (x_phdr)) | |
238 | goto fail; | |
239 | } | |
240 | ||
d20966a7 | 241 | /* Move to the start of the program headers. */ |
dc810e39 | 242 | if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0) |
d20966a7 | 243 | goto wrong; |
3e932841 KH |
244 | |
245 | /* Allocate space for the program headers. */ | |
dc810e39 | 246 | amt = sizeof (*i_phdrp) * i_ehdrp->e_phnum; |
a50b1753 | 247 | i_phdrp = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt); |
252b5132 | 248 | if (!i_phdrp) |
0ab2f69a | 249 | goto fail; |
252b5132 RH |
250 | |
251 | elf_tdata (abfd)->phdr = i_phdrp; | |
252 | ||
3e932841 | 253 | /* Read and convert to internal form. */ |
252b5132 RH |
254 | for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) |
255 | { | |
256 | Elf_External_Phdr x_phdr; | |
3193e234 | 257 | |
268b6b39 | 258 | if (bfd_bread (&x_phdr, sizeof (x_phdr), abfd) != sizeof (x_phdr)) |
0ab2f69a | 259 | goto fail; |
252b5132 RH |
260 | |
261 | elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex); | |
262 | } | |
263 | ||
702248bb JT |
264 | /* Set the machine architecture. Do this before processing the |
265 | program headers since we need to know the architecture type | |
266 | when processing the notes of some systems' core files. */ | |
5cba516c | 267 | if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0) |
252b5132 | 268 | /* It's OK if this fails for the generic target. */ |
5cba516c NC |
269 | && ebd->elf_machine_code != EM_NONE) |
270 | goto fail; | |
271 | ||
272 | /* Let the backend double check the format and override global | |
273 | information. We do this before processing the program headers | |
274 | to allow the correct machine (as opposed to just the default | |
275 | machine) to be set, making it possible for grok_prstatus and | |
276 | grok_psinfo to rely on the mach setting. */ | |
277 | if (ebd->elf_backend_object_p != NULL | |
278 | && ! ebd->elf_backend_object_p (abfd)) | |
279 | goto wrong; | |
252b5132 | 280 | |
a94cef6a JT |
281 | /* Process each program header. */ |
282 | for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) | |
3193e234 NC |
283 | if (! bfd_section_from_phdr (abfd, i_phdrp + phindex, (int) phindex)) |
284 | goto fail; | |
a94cef6a | 285 | |
536d0ff4 AM |
286 | /* Check for core truncation. */ |
287 | { | |
288 | bfd_size_type high = 0; | |
289 | struct stat statbuf; | |
68ffbac6 | 290 | for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) |
536d0ff4 AM |
291 | { |
292 | Elf_Internal_Phdr *p = i_phdrp + phindex; | |
293 | if (p->p_filesz) | |
294 | { | |
295 | bfd_size_type current = p->p_offset + p->p_filesz; | |
296 | if (high < current) | |
297 | high = current; | |
298 | } | |
299 | } | |
300 | if (bfd_stat (abfd, &statbuf) == 0) | |
301 | { | |
302 | if ((bfd_size_type) statbuf.st_size < high) | |
303 | { | |
304 | (*_bfd_error_handler) | |
305 | (_("Warning: %B is truncated: expected core file " | |
306 | "size >= %lu, found: %lu."), | |
307 | abfd, (unsigned long) high, (unsigned long) statbuf.st_size); | |
308 | } | |
309 | } | |
310 | } | |
68ffbac6 | 311 | |
3e932841 | 312 | /* Save the entry point from the ELF header. */ |
252b5132 | 313 | bfd_get_start_address (abfd) = i_ehdrp->e_entry; |
252b5132 | 314 | return abfd->xvec; |
0ab2f69a MS |
315 | |
316 | wrong: | |
317 | bfd_set_error (bfd_error_wrong_format); | |
318 | fail: | |
0ab2f69a | 319 | return NULL; |
252b5132 | 320 | } |