Go to most recent revision | Details | Last modification | View Log | RSS feed
Rev | Author | Line No. | Line |
---|---|---|---|
5197 | serge | 1 | /* ELF core file support for BFD. |
2 | Copyright 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2005, 2007, |
||
3 | 2008, 2010 Free Software Foundation, Inc. |
||
4 | |||
5 | This file is part of BFD, the Binary File Descriptor library. |
||
6 | |||
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 |
||
9 | the Free Software Foundation; either version 3 of the License, or |
||
10 | (at your option) any later version. |
||
11 | |||
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. |
||
16 | |||
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 |
||
19 | Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, |
||
20 | MA 02110-1301, USA. */ |
||
21 | |||
22 | char* |
||
23 | elf_core_file_failing_command (bfd *abfd) |
||
24 | { |
||
25 | return elf_tdata (abfd)->core->command; |
||
26 | } |
||
27 | |||
28 | int |
||
29 | elf_core_file_failing_signal (bfd *abfd) |
||
30 | { |
||
31 | return elf_tdata (abfd)->core->signal; |
||
32 | } |
||
33 | |||
34 | int |
||
35 | elf_core_file_pid (bfd *abfd) |
||
36 | { |
||
37 | return elf_tdata (abfd)->core->pid; |
||
38 | } |
||
39 | |||
40 | bfd_boolean |
||
41 | elf_core_file_matches_executable_p (bfd *core_bfd, bfd *exec_bfd) |
||
42 | { |
||
43 | char* corename; |
||
44 | |||
45 | /* xvecs must match if both are ELF files for the same target. */ |
||
46 | |||
47 | if (core_bfd->xvec != exec_bfd->xvec) |
||
48 | { |
||
49 | bfd_set_error (bfd_error_system_call); |
||
50 | return FALSE; |
||
51 | } |
||
52 | |||
53 | /* See if the name in the corefile matches the executable name. */ |
||
54 | corename = elf_tdata (core_bfd)->core->program; |
||
55 | if (corename != NULL) |
||
56 | { |
||
57 | const char* execname = strrchr (exec_bfd->filename, '/'); |
||
58 | |||
59 | execname = execname ? execname + 1 : exec_bfd->filename; |
||
60 | |||
61 | if (strcmp (execname, corename) != 0) |
||
62 | return FALSE; |
||
63 | } |
||
64 | |||
65 | return TRUE; |
||
66 | } |
||
67 | |||
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 |
||
77 | floating point registers (.reg2). */ |
||
78 | |||
79 | const bfd_target * |
||
80 | elf_core_file_p (bfd *abfd) |
||
81 | { |
||
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. */ |
||
85 | unsigned int phindex; |
||
86 | const struct elf_backend_data *ebd; |
||
87 | bfd_size_type amt; |
||
88 | |||
89 | /* Read in the ELF header in external format. */ |
||
90 | if (bfd_bread (&x_ehdr, sizeof (x_ehdr), abfd) != sizeof (x_ehdr)) |
||
91 | { |
||
92 | if (bfd_get_error () != bfd_error_system_call) |
||
93 | goto wrong; |
||
94 | else |
||
95 | goto fail; |
||
96 | } |
||
97 | |||
98 | /* Check the magic number. */ |
||
99 | if (! elf_file_p (&x_ehdr)) |
||
100 | goto wrong; |
||
101 | |||
102 | /* FIXME: Check EI_VERSION here ! */ |
||
103 | |||
104 | /* Check the address size ("class"). */ |
||
105 | if (x_ehdr.e_ident[EI_CLASS] != ELFCLASS) |
||
106 | goto wrong; |
||
107 | |||
108 | /* Check the byteorder. */ |
||
109 | switch (x_ehdr.e_ident[EI_DATA]) |
||
110 | { |
||
111 | case ELFDATA2MSB: /* Big-endian. */ |
||
112 | if (! bfd_big_endian (abfd)) |
||
113 | goto wrong; |
||
114 | break; |
||
115 | case ELFDATA2LSB: /* Little-endian. */ |
||
116 | if (! bfd_little_endian (abfd)) |
||
117 | goto wrong; |
||
118 | break; |
||
119 | default: |
||
120 | goto wrong; |
||
121 | } |
||
122 | |||
123 | /* Give abfd an elf_obj_tdata. */ |
||
124 | if (! (*abfd->xvec->_bfd_set_format[bfd_core]) (abfd)) |
||
125 | goto fail; |
||
126 | |||
127 | /* Swap in the rest of the header, now that we have the byte order. */ |
||
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 | { |
||
156 | const struct elf_backend_data *back; |
||
157 | |||
158 | if ((*target_ptr)->flavour != bfd_target_elf_flavour) |
||
159 | continue; |
||
160 | back = xvec_get_elf_backend_data (*target_ptr); |
||
161 | if (back->s->arch_size != ARCH_SIZE) |
||
162 | continue; |
||
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)) |
||
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 |
||
177 | we are hosed. */ |
||
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 | |||
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 | |||
241 | /* Move to the start of the program headers. */ |
||
242 | if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0) |
||
243 | goto wrong; |
||
244 | |||
245 | /* Allocate space for the program headers. */ |
||
246 | amt = sizeof (*i_phdrp) * i_ehdrp->e_phnum; |
||
247 | i_phdrp = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt); |
||
248 | if (!i_phdrp) |
||
249 | goto fail; |
||
250 | |||
251 | elf_tdata (abfd)->phdr = i_phdrp; |
||
252 | |||
253 | /* Read and convert to internal form. */ |
||
254 | for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) |
||
255 | { |
||
256 | Elf_External_Phdr x_phdr; |
||
257 | |||
258 | if (bfd_bread (&x_phdr, sizeof (x_phdr), abfd) != sizeof (x_phdr)) |
||
259 | goto fail; |
||
260 | |||
261 | elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex); |
||
262 | } |
||
263 | |||
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. */ |
||
267 | if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0) |
||
268 | /* It's OK if this fails for the generic target. */ |
||
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; |
||
280 | |||
281 | /* Process each program header. */ |
||
282 | for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) |
||
283 | if (! bfd_section_from_phdr (abfd, i_phdrp + phindex, (int) phindex)) |
||
284 | goto fail; |
||
285 | |||
286 | /* Check for core truncation. */ |
||
287 | { |
||
288 | bfd_size_type high = 0; |
||
289 | struct stat statbuf; |
||
290 | for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) |
||
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 | } |
||
311 | |||
312 | /* Save the entry point from the ELF header. */ |
||
313 | bfd_get_start_address (abfd) = i_ehdrp->e_entry; |
||
314 | return abfd->xvec; |
||
315 | |||
316 | wrong: |
||
317 | bfd_set_error (bfd_error_wrong_format); |
||
318 | fail: |
||
319 | return NULL; |
||
320 | }>>>>>=> |