Commit | Line | Data |
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252b5132 | 1 | /* ELF core file support for BFD. |
3193e234 | 2 | Copyright 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003 |
7898deda | 3 | 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 | |
9 | the Free Software Foundation; either version 2 of the License, or | |
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 | |
19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
252b5132 | 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 | ||
b34976b6 | 35 | bfd_boolean |
252b5132 RH |
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); | |
b34976b6 | 47 | return FALSE; |
252b5132 RH |
48 | } |
49 | ||
3e932841 | 50 | /* See if the name in the corefile matches the executable name. */ |
252b5132 RH |
51 | corename = elf_tdata (core_bfd)->core_program; |
52 | if (corename != NULL) | |
53 | { | |
54 | const char* execname = strrchr (exec_bfd->filename, '/'); | |
3193e234 | 55 | |
252b5132 RH |
56 | execname = execname ? execname + 1 : exec_bfd->filename; |
57 | ||
58 | if (strcmp(execname, corename) != 0) | |
b34976b6 | 59 | return FALSE; |
252b5132 RH |
60 | } |
61 | ||
b34976b6 | 62 | return TRUE; |
252b5132 RH |
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 | |
3193e234 | 74 | floating point registers (.reg2). */ |
252b5132 RH |
75 | |
76 | const bfd_target * | |
77 | elf_core_file_p (abfd) | |
78 | bfd *abfd; | |
79 | { | |
3193e234 NC |
80 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form. */ |
81 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form. */ | |
82 | Elf_Internal_Phdr *i_phdrp; /* Elf program header, internal form. */ | |
252b5132 RH |
83 | unsigned int phindex; |
84 | struct elf_backend_data *ebd; | |
ed591155 | 85 | struct bfd_preserve preserve; |
dc810e39 | 86 | bfd_size_type amt; |
252b5132 | 87 | |
a7f84125 | 88 | preserve.marker = NULL; |
12e1f53e | 89 | |
252b5132 | 90 | /* Read in the ELF header in external format. */ |
dc810e39 AM |
91 | if (bfd_bread ((PTR) &x_ehdr, (bfd_size_type) sizeof (x_ehdr), abfd) |
92 | != sizeof (x_ehdr)) | |
252b5132 RH |
93 | { |
94 | if (bfd_get_error () != bfd_error_system_call) | |
a7f84125 AM |
95 | goto wrong; |
96 | else | |
97 | goto fail; | |
252b5132 RH |
98 | } |
99 | ||
3e932841 | 100 | /* Check the magic number. */ |
82e51918 | 101 | if (! elf_file_p (&x_ehdr)) |
60bcf0fa | 102 | goto wrong; |
252b5132 | 103 | |
3193e234 | 104 | /* FIXME: Check EI_VERSION here ! */ |
252b5132 | 105 | |
3e932841 | 106 | /* Check the address size ("class"). */ |
252b5132 RH |
107 | if (x_ehdr.e_ident[EI_CLASS] != ELFCLASS) |
108 | goto wrong; | |
109 | ||
3e932841 | 110 | /* Check the byteorder. */ |
252b5132 RH |
111 | switch (x_ehdr.e_ident[EI_DATA]) |
112 | { | |
3193e234 | 113 | case ELFDATA2MSB: /* Big-endian. */ |
252b5132 RH |
114 | if (! bfd_big_endian (abfd)) |
115 | goto wrong; | |
116 | break; | |
3193e234 | 117 | case ELFDATA2LSB: /* Little-endian. */ |
252b5132 RH |
118 | if (! bfd_little_endian (abfd)) |
119 | goto wrong; | |
120 | break; | |
121 | default: | |
122 | goto wrong; | |
123 | } | |
124 | ||
3e932841 | 125 | /* Give abfd an elf_obj_tdata. */ |
dc810e39 | 126 | amt = sizeof (struct elf_obj_tdata); |
a7f84125 AM |
127 | preserve.marker = bfd_zalloc (abfd, amt); |
128 | if (preserve.marker == NULL) | |
129 | goto fail; | |
130 | if (!bfd_preserve_save (abfd, &preserve)) | |
ed591155 AM |
131 | goto fail; |
132 | ||
a7f84125 AM |
133 | elf_tdata (abfd) = preserve.marker; |
134 | ||
3e932841 | 135 | /* Swap in the rest of the header, now that we have the byte order. */ |
252b5132 RH |
136 | i_ehdrp = elf_elfheader (abfd); |
137 | elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp); | |
138 | ||
139 | #if DEBUG & 1 | |
140 | elf_debug_file (i_ehdrp); | |
141 | #endif | |
142 | ||
143 | ebd = get_elf_backend_data (abfd); | |
144 | ||
145 | /* Check that the ELF e_machine field matches what this particular | |
146 | BFD format expects. */ | |
147 | ||
148 | if (ebd->elf_machine_code != i_ehdrp->e_machine | |
149 | && (ebd->elf_machine_alt1 == 0 | |
150 | || i_ehdrp->e_machine != ebd->elf_machine_alt1) | |
151 | && (ebd->elf_machine_alt2 == 0 | |
152 | || i_ehdrp->e_machine != ebd->elf_machine_alt2)) | |
153 | { | |
154 | const bfd_target * const *target_ptr; | |
155 | ||
156 | if (ebd->elf_machine_code != EM_NONE) | |
157 | goto wrong; | |
158 | ||
159 | /* This is the generic ELF target. Let it match any ELF target | |
160 | for which we do not have a specific backend. */ | |
161 | ||
162 | for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++) | |
163 | { | |
164 | struct elf_backend_data *back; | |
165 | ||
166 | if ((*target_ptr)->flavour != bfd_target_elf_flavour) | |
167 | continue; | |
168 | back = (struct elf_backend_data *) (*target_ptr)->backend_data; | |
3193e234 NC |
169 | if (back->elf_machine_code == i_ehdrp->e_machine |
170 | || (back->elf_machine_alt1 != 0 | |
171 | && i_ehdrp->e_machine == back->elf_machine_alt1) | |
172 | || (back->elf_machine_alt2 != 0 | |
173 | && i_ehdrp->e_machine == back->elf_machine_alt2)) | |
252b5132 RH |
174 | { |
175 | /* target_ptr is an ELF backend which matches this | |
176 | object file, so reject the generic ELF target. */ | |
177 | goto wrong; | |
178 | } | |
179 | } | |
180 | } | |
181 | ||
182 | /* If there is no program header, or the type is not a core file, then | |
3e932841 | 183 | we are hosed. */ |
252b5132 RH |
184 | if (i_ehdrp->e_phoff == 0 || i_ehdrp->e_type != ET_CORE) |
185 | goto wrong; | |
186 | ||
187 | /* Does BFD's idea of the phdr size match the size | |
188 | recorded in the file? */ | |
189 | if (i_ehdrp->e_phentsize != sizeof (Elf_External_Phdr)) | |
190 | goto wrong; | |
191 | ||
d20966a7 | 192 | /* Move to the start of the program headers. */ |
dc810e39 | 193 | if (bfd_seek (abfd, (file_ptr) i_ehdrp->e_phoff, SEEK_SET) != 0) |
d20966a7 | 194 | goto wrong; |
3e932841 KH |
195 | |
196 | /* Allocate space for the program headers. */ | |
dc810e39 AM |
197 | amt = sizeof (*i_phdrp) * i_ehdrp->e_phnum; |
198 | i_phdrp = (Elf_Internal_Phdr *) bfd_alloc (abfd, amt); | |
252b5132 | 199 | if (!i_phdrp) |
0ab2f69a | 200 | goto fail; |
252b5132 RH |
201 | |
202 | elf_tdata (abfd)->phdr = i_phdrp; | |
203 | ||
3e932841 | 204 | /* Read and convert to internal form. */ |
252b5132 RH |
205 | for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) |
206 | { | |
207 | Elf_External_Phdr x_phdr; | |
3193e234 | 208 | |
dc810e39 | 209 | if (bfd_bread ((PTR) &x_phdr, (bfd_size_type) sizeof (x_phdr), abfd) |
252b5132 | 210 | != sizeof (x_phdr)) |
0ab2f69a | 211 | goto fail; |
252b5132 RH |
212 | |
213 | elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex); | |
214 | } | |
215 | ||
702248bb JT |
216 | /* Set the machine architecture. Do this before processing the |
217 | program headers since we need to know the architecture type | |
218 | when processing the notes of some systems' core files. */ | |
252b5132 RH |
219 | if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0)) |
220 | { | |
221 | /* It's OK if this fails for the generic target. */ | |
222 | if (ebd->elf_machine_code != EM_NONE) | |
0ab2f69a | 223 | goto fail; |
252b5132 RH |
224 | } |
225 | ||
a94cef6a JT |
226 | /* Process each program header. */ |
227 | for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) | |
3193e234 NC |
228 | if (! bfd_section_from_phdr (abfd, i_phdrp + phindex, (int) phindex)) |
229 | goto fail; | |
a94cef6a | 230 | |
3e932841 | 231 | /* Save the entry point from the ELF header. */ |
252b5132 RH |
232 | bfd_get_start_address (abfd) = i_ehdrp->e_entry; |
233 | ||
279b54a1 MS |
234 | /* Let the backend double check the format and override global |
235 | information. */ | |
3193e234 NC |
236 | if (ebd->elf_backend_object_p |
237 | && (! (*ebd->elf_backend_object_p) (abfd))) | |
238 | goto wrong; | |
279b54a1 | 239 | |
a7f84125 | 240 | bfd_preserve_finish (abfd, &preserve); |
252b5132 | 241 | return abfd->xvec; |
0ab2f69a MS |
242 | |
243 | wrong: | |
12e1f53e HPN |
244 | /* There is way too much undoing of half-known state here. The caller, |
245 | bfd_check_format_matches, really shouldn't iterate on live bfd's to | |
246 | check match/no-match like it does. We have to rely on that a call to | |
247 | bfd_default_set_arch_mach with the previously known mach, undoes what | |
248 | was done by the first bfd_default_set_arch_mach (with mach 0) here. | |
249 | For this to work, only elf-data and the mach may be changed by the | |
250 | target-specific elf_backend_object_p function. Note that saving the | |
251 | whole bfd here and restoring it would be even worse; the first thing | |
252 | you notice is that the cached bfd file position gets out of sync. */ | |
0ab2f69a | 253 | bfd_set_error (bfd_error_wrong_format); |
ed591155 | 254 | |
0ab2f69a | 255 | fail: |
a7f84125 AM |
256 | if (preserve.marker != NULL) |
257 | bfd_preserve_restore (abfd, &preserve); | |
0ab2f69a | 258 | return NULL; |
252b5132 | 259 | } |