Commit | Line | Data |
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252b5132 | 1 | /* ELF core file support for BFD. |
7898deda NC |
2 | Copyright 1995, 1996, 1997, 1998, 2000, 2001 |
3 | Free Software Foundation, Inc. | |
252b5132 RH |
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 2 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
20 | ||
252b5132 RH |
21 | char* |
22 | elf_core_file_failing_command (abfd) | |
23 | bfd *abfd; | |
24 | { | |
25 | return elf_tdata (abfd)->core_command; | |
26 | } | |
27 | ||
28 | int | |
29 | elf_core_file_failing_signal (abfd) | |
30 | bfd *abfd; | |
31 | { | |
32 | return elf_tdata (abfd)->core_signal; | |
33 | } | |
34 | ||
252b5132 RH |
35 | boolean |
36 | elf_core_file_matches_executable_p (core_bfd, exec_bfd) | |
37 | bfd *core_bfd; | |
38 | bfd *exec_bfd; | |
39 | { | |
40 | char* corename; | |
41 | ||
3e932841 | 42 | /* xvecs must match if both are ELF files for the same target. */ |
252b5132 RH |
43 | |
44 | if (core_bfd->xvec != exec_bfd->xvec) | |
45 | { | |
46 | bfd_set_error (bfd_error_system_call); | |
47 | return false; | |
48 | } | |
49 | ||
3e932841 | 50 | /* See if the name in the corefile matches the executable name. */ |
252b5132 RH |
51 | |
52 | corename = elf_tdata (core_bfd)->core_program; | |
53 | if (corename != NULL) | |
54 | { | |
55 | const char* execname = strrchr (exec_bfd->filename, '/'); | |
56 | execname = execname ? execname + 1 : exec_bfd->filename; | |
57 | ||
58 | if (strcmp(execname, corename) != 0) | |
59 | return false; | |
60 | } | |
61 | ||
62 | return true; | |
63 | } | |
64 | ||
252b5132 RH |
65 | /* Core files are simply standard ELF formatted files that partition |
66 | the file using the execution view of the file (program header table) | |
67 | rather than the linking view. In fact, there is no section header | |
68 | table in a core file. | |
69 | ||
70 | The process status information (including the contents of the general | |
71 | register set) and the floating point register set are stored in a | |
72 | segment of type PT_NOTE. We handcraft a couple of extra bfd sections | |
73 | that allow standard bfd access to the general registers (.reg) and the | |
74 | floating point registers (.reg2). | |
75 | ||
76 | */ | |
77 | ||
78 | const bfd_target * | |
79 | elf_core_file_p (abfd) | |
80 | 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 */ | |
0ab2f69a | 84 | Elf_Internal_Phdr *i_phdrp = NULL; /* Elf program header, internal form */ |
252b5132 RH |
85 | unsigned int phindex; |
86 | struct elf_backend_data *ebd; | |
0ab2f69a | 87 | struct elf_obj_tdata *preserved_tdata = elf_tdata (abfd); |
12e1f53e HPN |
88 | struct sec *preserved_sections = abfd->sections; |
89 | unsigned int preserved_section_count = abfd->section_count; | |
90 | enum bfd_architecture previous_arch = bfd_get_arch (abfd); | |
91 | unsigned long previous_mach = bfd_get_mach (abfd); | |
0ab2f69a | 92 | struct elf_obj_tdata *new_tdata = NULL; |
dc810e39 | 93 | bfd_size_type amt; |
252b5132 | 94 | |
12e1f53e HPN |
95 | /* Clear section information, since there might be a recognized bfd that |
96 | we now check if we can replace, and we don't want to append to it. */ | |
97 | abfd->sections = NULL; | |
98 | abfd->section_count = 0; | |
99 | ||
252b5132 | 100 | /* Read in the ELF header in external format. */ |
dc810e39 AM |
101 | if (bfd_bread ((PTR) &x_ehdr, (bfd_size_type) sizeof (x_ehdr), abfd) |
102 | != sizeof (x_ehdr)) | |
252b5132 RH |
103 | { |
104 | if (bfd_get_error () != bfd_error_system_call) | |
105 | bfd_set_error (bfd_error_wrong_format); | |
106 | return NULL; | |
107 | } | |
108 | ||
3e932841 | 109 | /* Check the magic number. */ |
252b5132 | 110 | if (elf_file_p (&x_ehdr) == false) |
60bcf0fa | 111 | goto wrong; |
252b5132 RH |
112 | |
113 | /* FIXME: Check EI_VERSION here ! */ | |
114 | ||
3e932841 | 115 | /* Check the address size ("class"). */ |
252b5132 RH |
116 | if (x_ehdr.e_ident[EI_CLASS] != ELFCLASS) |
117 | goto wrong; | |
118 | ||
3e932841 | 119 | /* Check the byteorder. */ |
252b5132 RH |
120 | switch (x_ehdr.e_ident[EI_DATA]) |
121 | { | |
122 | case ELFDATA2MSB: /* Big-endian */ | |
123 | if (! bfd_big_endian (abfd)) | |
124 | goto wrong; | |
125 | break; | |
126 | case ELFDATA2LSB: /* Little-endian */ | |
127 | if (! bfd_little_endian (abfd)) | |
128 | goto wrong; | |
129 | break; | |
130 | default: | |
131 | goto wrong; | |
132 | } | |
133 | ||
3e932841 | 134 | /* Give abfd an elf_obj_tdata. */ |
dc810e39 AM |
135 | amt = sizeof (struct elf_obj_tdata); |
136 | new_tdata = (struct elf_obj_tdata *) bfd_zalloc (abfd, amt); | |
0ab2f69a | 137 | if (new_tdata == NULL) |
252b5132 | 138 | return NULL; |
3e932841 | 139 | elf_tdata (abfd) = new_tdata; |
252b5132 | 140 | |
3e932841 | 141 | /* Swap in the rest of the header, now that we have the byte order. */ |
252b5132 RH |
142 | i_ehdrp = elf_elfheader (abfd); |
143 | elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp); | |
144 | ||
145 | #if DEBUG & 1 | |
146 | elf_debug_file (i_ehdrp); | |
147 | #endif | |
148 | ||
149 | ebd = get_elf_backend_data (abfd); | |
150 | ||
151 | /* Check that the ELF e_machine field matches what this particular | |
152 | BFD format expects. */ | |
153 | ||
154 | if (ebd->elf_machine_code != i_ehdrp->e_machine | |
155 | && (ebd->elf_machine_alt1 == 0 | |
156 | || i_ehdrp->e_machine != ebd->elf_machine_alt1) | |
157 | && (ebd->elf_machine_alt2 == 0 | |
158 | || i_ehdrp->e_machine != ebd->elf_machine_alt2)) | |
159 | { | |
160 | const bfd_target * const *target_ptr; | |
161 | ||
162 | if (ebd->elf_machine_code != EM_NONE) | |
163 | goto wrong; | |
164 | ||
165 | /* This is the generic ELF target. Let it match any ELF target | |
166 | for which we do not have a specific backend. */ | |
167 | ||
168 | for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++) | |
169 | { | |
170 | struct elf_backend_data *back; | |
171 | ||
172 | if ((*target_ptr)->flavour != bfd_target_elf_flavour) | |
173 | continue; | |
174 | back = (struct elf_backend_data *) (*target_ptr)->backend_data; | |
175 | if (back->elf_machine_code == i_ehdrp->e_machine) | |
176 | { | |
177 | /* target_ptr is an ELF backend which matches this | |
178 | object file, so reject the generic ELF target. */ | |
179 | goto wrong; | |
180 | } | |
181 | } | |
182 | } | |
183 | ||
184 | /* If there is no program header, or the type is not a core file, then | |
3e932841 | 185 | we are hosed. */ |
252b5132 RH |
186 | if (i_ehdrp->e_phoff == 0 || i_ehdrp->e_type != ET_CORE) |
187 | goto wrong; | |
188 | ||
189 | /* Does BFD's idea of the phdr size match the size | |
190 | recorded in the file? */ | |
191 | if (i_ehdrp->e_phentsize != sizeof (Elf_External_Phdr)) | |
192 | goto wrong; | |
193 | ||
d20966a7 | 194 | /* Move to the start of the program headers. */ |
dc810e39 | 195 | if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0) |
d20966a7 | 196 | goto wrong; |
3e932841 KH |
197 | |
198 | /* Allocate space for the program headers. */ | |
dc810e39 AM |
199 | amt = sizeof (*i_phdrp) * i_ehdrp->e_phnum; |
200 | i_phdrp = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt); | |
252b5132 | 201 | if (!i_phdrp) |
0ab2f69a | 202 | goto fail; |
252b5132 RH |
203 | |
204 | elf_tdata (abfd)->phdr = i_phdrp; | |
205 | ||
3e932841 | 206 | /* Read and convert to internal form. */ |
252b5132 RH |
207 | for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) |
208 | { | |
209 | Elf_External_Phdr x_phdr; | |
dc810e39 | 210 | if (bfd_bread ((PTR) &x_phdr, (bfd_size_type) sizeof (x_phdr), abfd) |
252b5132 | 211 | != sizeof (x_phdr)) |
0ab2f69a | 212 | goto fail; |
252b5132 RH |
213 | |
214 | elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex); | |
215 | } | |
216 | ||
3e932841 | 217 | /* Process each program header. */ |
252b5132 RH |
218 | for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) |
219 | { | |
dc810e39 | 220 | if (! bfd_section_from_phdr (abfd, i_phdrp + phindex, (int) phindex)) |
0ab2f69a | 221 | goto fail; |
252b5132 RH |
222 | } |
223 | ||
3e932841 | 224 | /* Set the machine architecture. */ |
252b5132 RH |
225 | if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0)) |
226 | { | |
227 | /* It's OK if this fails for the generic target. */ | |
228 | if (ebd->elf_machine_code != EM_NONE) | |
0ab2f69a | 229 | goto fail; |
252b5132 RH |
230 | } |
231 | ||
3e932841 | 232 | /* Save the entry point from the ELF header. */ |
252b5132 RH |
233 | bfd_get_start_address (abfd) = i_ehdrp->e_entry; |
234 | ||
279b54a1 MS |
235 | /* Let the backend double check the format and override global |
236 | information. */ | |
237 | if (ebd->elf_backend_object_p) | |
238 | { | |
239 | if ((*ebd->elf_backend_object_p) (abfd) == false) | |
240 | goto wrong; | |
241 | } | |
242 | ||
252b5132 | 243 | return abfd->xvec; |
0ab2f69a MS |
244 | |
245 | wrong: | |
12e1f53e HPN |
246 | /* There is way too much undoing of half-known state here. The caller, |
247 | bfd_check_format_matches, really shouldn't iterate on live bfd's to | |
248 | check match/no-match like it does. We have to rely on that a call to | |
249 | bfd_default_set_arch_mach with the previously known mach, undoes what | |
250 | was done by the first bfd_default_set_arch_mach (with mach 0) here. | |
251 | For this to work, only elf-data and the mach may be changed by the | |
252 | target-specific elf_backend_object_p function. Note that saving the | |
253 | whole bfd here and restoring it would be even worse; the first thing | |
254 | you notice is that the cached bfd file position gets out of sync. */ | |
255 | bfd_default_set_arch_mach (abfd, previous_arch, previous_mach); | |
0ab2f69a MS |
256 | bfd_set_error (bfd_error_wrong_format); |
257 | fail: | |
258 | if (i_phdrp != NULL) | |
259 | bfd_release (abfd, i_phdrp); | |
260 | if (new_tdata != NULL) | |
261 | bfd_release (abfd, new_tdata); | |
262 | elf_tdata (abfd) = preserved_tdata; | |
12e1f53e HPN |
263 | abfd->sections = preserved_sections; |
264 | abfd->section_count = preserved_section_count; | |
0ab2f69a | 265 | return NULL; |
252b5132 | 266 | } |