Commit | Line | Data |
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252b5132 RH |
1 | /* ELF core file support for BFD. |
2 | Copyright (C) 1995, 1996, 1997, 1998 Free Software Foundation, Inc. | |
3 | ||
4 | This file is part of BFD, the Binary File Descriptor library. | |
5 | ||
6 | This program is free software; you can redistribute it and/or modify | |
7 | it under the terms of the GNU General Public License as published by | |
8 | the Free Software Foundation; either version 2 of the License, or | |
9 | (at your option) any later version. | |
10 | ||
11 | This program is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | GNU General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with this program; if not, write to the Free Software | |
18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
19 | ||
20 | ||
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 | ||
35 | ||
36 | boolean | |
37 | elf_core_file_matches_executable_p (core_bfd, exec_bfd) | |
38 | bfd *core_bfd; | |
39 | bfd *exec_bfd; | |
40 | { | |
41 | char* corename; | |
42 | ||
43 | /* xvecs must match if both are ELF files for the same target. */ | |
44 | ||
45 | if (core_bfd->xvec != exec_bfd->xvec) | |
46 | { | |
47 | bfd_set_error (bfd_error_system_call); | |
48 | return false; | |
49 | } | |
50 | ||
51 | /* See if the name in the corefile matches the executable name. */ | |
52 | ||
53 | corename = elf_tdata (core_bfd)->core_program; | |
54 | if (corename != NULL) | |
55 | { | |
56 | const char* execname = strrchr (exec_bfd->filename, '/'); | |
57 | execname = execname ? execname + 1 : exec_bfd->filename; | |
58 | ||
59 | if (strcmp(execname, corename) != 0) | |
60 | return false; | |
61 | } | |
62 | ||
63 | return true; | |
64 | } | |
65 | ||
66 | ||
67 | /* Core files are simply standard ELF formatted files that partition | |
68 | the file using the execution view of the file (program header table) | |
69 | rather than the linking view. In fact, there is no section header | |
70 | table in a core file. | |
71 | ||
72 | The process status information (including the contents of the general | |
73 | register set) and the floating point register set are stored in a | |
74 | segment of type PT_NOTE. We handcraft a couple of extra bfd sections | |
75 | that allow standard bfd access to the general registers (.reg) and the | |
76 | floating point registers (.reg2). | |
77 | ||
78 | */ | |
79 | ||
80 | const bfd_target * | |
81 | elf_core_file_p (abfd) | |
82 | bfd *abfd; | |
83 | { | |
84 | Elf_External_Ehdr x_ehdr; /* Elf file header, external form */ | |
85 | Elf_Internal_Ehdr *i_ehdrp; /* Elf file header, internal form */ | |
0ab2f69a | 86 | Elf_Internal_Phdr *i_phdrp = NULL; /* Elf program header, internal form */ |
252b5132 RH |
87 | unsigned int phindex; |
88 | struct elf_backend_data *ebd; | |
0ab2f69a MS |
89 | struct elf_obj_tdata *preserved_tdata = elf_tdata (abfd); |
90 | struct elf_obj_tdata *new_tdata = NULL; | |
252b5132 RH |
91 | |
92 | /* Read in the ELF header in external format. */ | |
93 | if (bfd_read ((PTR) & x_ehdr, sizeof (x_ehdr), 1, abfd) != sizeof (x_ehdr)) | |
94 | { | |
95 | if (bfd_get_error () != bfd_error_system_call) | |
96 | bfd_set_error (bfd_error_wrong_format); | |
97 | return NULL; | |
98 | } | |
99 | ||
100 | /* Check the magic number. */ | |
101 | if (elf_file_p (&x_ehdr) == false) | |
60bcf0fa | 102 | goto wrong; |
252b5132 RH |
103 | |
104 | /* FIXME: Check EI_VERSION here ! */ | |
105 | ||
106 | /* Check the address size ("class"). */ | |
107 | if (x_ehdr.e_ident[EI_CLASS] != ELFCLASS) | |
108 | goto wrong; | |
109 | ||
110 | /* Check the byteorder. */ | |
111 | switch (x_ehdr.e_ident[EI_DATA]) | |
112 | { | |
113 | case ELFDATA2MSB: /* Big-endian */ | |
114 | if (! bfd_big_endian (abfd)) | |
115 | goto wrong; | |
116 | break; | |
117 | case ELFDATA2LSB: /* Little-endian */ | |
118 | if (! bfd_little_endian (abfd)) | |
119 | goto wrong; | |
120 | break; | |
121 | default: | |
122 | goto wrong; | |
123 | } | |
124 | ||
125 | /* Give abfd an elf_obj_tdata. */ | |
0ab2f69a | 126 | new_tdata = |
252b5132 | 127 | (struct elf_obj_tdata *) bfd_zalloc (abfd, sizeof (struct elf_obj_tdata)); |
0ab2f69a | 128 | if (new_tdata == NULL) |
252b5132 | 129 | return NULL; |
0ab2f69a | 130 | elf_tdata (abfd) = new_tdata; |
252b5132 RH |
131 | |
132 | /* Swap in the rest of the header, now that we have the byte order. */ | |
133 | i_ehdrp = elf_elfheader (abfd); | |
134 | elf_swap_ehdr_in (abfd, &x_ehdr, i_ehdrp); | |
135 | ||
136 | #if DEBUG & 1 | |
137 | elf_debug_file (i_ehdrp); | |
138 | #endif | |
139 | ||
140 | ebd = get_elf_backend_data (abfd); | |
141 | ||
142 | /* Check that the ELF e_machine field matches what this particular | |
143 | BFD format expects. */ | |
144 | ||
145 | if (ebd->elf_machine_code != i_ehdrp->e_machine | |
146 | && (ebd->elf_machine_alt1 == 0 | |
147 | || i_ehdrp->e_machine != ebd->elf_machine_alt1) | |
148 | && (ebd->elf_machine_alt2 == 0 | |
149 | || i_ehdrp->e_machine != ebd->elf_machine_alt2)) | |
150 | { | |
151 | const bfd_target * const *target_ptr; | |
152 | ||
153 | if (ebd->elf_machine_code != EM_NONE) | |
154 | goto wrong; | |
155 | ||
156 | /* This is the generic ELF target. Let it match any ELF target | |
157 | for which we do not have a specific backend. */ | |
158 | ||
159 | for (target_ptr = bfd_target_vector; *target_ptr != NULL; target_ptr++) | |
160 | { | |
161 | struct elf_backend_data *back; | |
162 | ||
163 | if ((*target_ptr)->flavour != bfd_target_elf_flavour) | |
164 | continue; | |
165 | back = (struct elf_backend_data *) (*target_ptr)->backend_data; | |
166 | if (back->elf_machine_code == i_ehdrp->e_machine) | |
167 | { | |
168 | /* target_ptr is an ELF backend which matches this | |
169 | object file, so reject the generic ELF target. */ | |
170 | goto wrong; | |
171 | } | |
172 | } | |
173 | } | |
174 | ||
175 | /* If there is no program header, or the type is not a core file, then | |
176 | we are hosed. */ | |
177 | if (i_ehdrp->e_phoff == 0 || i_ehdrp->e_type != ET_CORE) | |
178 | goto wrong; | |
179 | ||
180 | /* Does BFD's idea of the phdr size match the size | |
181 | recorded in the file? */ | |
182 | if (i_ehdrp->e_phentsize != sizeof (Elf_External_Phdr)) | |
183 | goto wrong; | |
184 | ||
185 | /* Allocate space for the program headers. */ | |
186 | i_phdrp = (Elf_Internal_Phdr *) | |
187 | bfd_alloc (abfd, sizeof (*i_phdrp) * i_ehdrp->e_phnum); | |
188 | if (!i_phdrp) | |
0ab2f69a | 189 | goto fail; |
252b5132 RH |
190 | |
191 | elf_tdata (abfd)->phdr = i_phdrp; | |
192 | ||
193 | /* Read and convert to internal form. */ | |
194 | for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) | |
195 | { | |
196 | Elf_External_Phdr x_phdr; | |
197 | if (bfd_read ((PTR) &x_phdr, sizeof (x_phdr), 1, abfd) | |
198 | != sizeof (x_phdr)) | |
0ab2f69a | 199 | goto fail; |
252b5132 RH |
200 | |
201 | elf_swap_phdr_in (abfd, &x_phdr, i_phdrp + phindex); | |
202 | } | |
203 | ||
204 | /* Process each program header. */ | |
205 | for (phindex = 0; phindex < i_ehdrp->e_phnum; ++phindex) | |
206 | { | |
207 | if (!_bfd_elfcore_section_from_phdr (abfd, i_phdrp + phindex, phindex)) | |
0ab2f69a | 208 | goto fail; |
252b5132 RH |
209 | } |
210 | ||
211 | /* Set the machine architecture. */ | |
212 | if (! bfd_default_set_arch_mach (abfd, ebd->arch, 0)) | |
213 | { | |
214 | /* It's OK if this fails for the generic target. */ | |
215 | if (ebd->elf_machine_code != EM_NONE) | |
0ab2f69a | 216 | goto fail; |
252b5132 RH |
217 | } |
218 | ||
219 | /* Save the entry point from the ELF header. */ | |
220 | bfd_get_start_address (abfd) = i_ehdrp->e_entry; | |
221 | ||
279b54a1 MS |
222 | /* Let the backend double check the format and override global |
223 | information. */ | |
224 | if (ebd->elf_backend_object_p) | |
225 | { | |
226 | if ((*ebd->elf_backend_object_p) (abfd) == false) | |
227 | goto wrong; | |
228 | } | |
229 | ||
252b5132 | 230 | return abfd->xvec; |
0ab2f69a MS |
231 | |
232 | wrong: | |
233 | bfd_set_error (bfd_error_wrong_format); | |
234 | fail: | |
235 | if (i_phdrp != NULL) | |
236 | bfd_release (abfd, i_phdrp); | |
237 | if (new_tdata != NULL) | |
238 | bfd_release (abfd, new_tdata); | |
239 | elf_tdata (abfd) = preserved_tdata; | |
240 | return NULL; | |
252b5132 | 241 | } |