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252b5132 | 1 | /* BFD back end for traditional Unix core files (U-area and raw sections) |
7898deda NC |
2 | Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999, |
3 | 2000 | |
252b5132 RH |
4 | Free Software Foundation, Inc. |
5 | Written by John Gilmore of Cygnus Support. | |
6 | ||
7 | This file is part of BFD, the Binary File Descriptor library. | |
8 | ||
9 | This program is free software; you can redistribute it and/or modify | |
10 | it under the terms of the GNU General Public License as published by | |
11 | the Free Software Foundation; either version 2 of the License, or | |
12 | (at your option) any later version. | |
13 | ||
14 | This program is distributed in the hope that it will be useful, | |
15 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | GNU General Public License for more details. | |
18 | ||
19 | You should have received a copy of the GNU General Public License | |
20 | along with this program; if not, write to the Free Software | |
21 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
22 | ||
23 | #include "bfd.h" | |
24 | #include "sysdep.h" | |
25 | #include "libbfd.h" | |
26 | #include "libaout.h" /* BFD a.out internal data structures */ | |
27 | ||
28 | #include <sys/param.h> | |
12df4d3c AC |
29 | #ifdef HAVE_DIRENT_H |
30 | # include <dirent.h> | |
31 | #else | |
32 | # ifdef HAVE_SYS_NDIR_H | |
33 | # include <sys/ndir.h> | |
34 | # endif | |
35 | # ifdef HAVE_SYS_DIR_H | |
36 | # include <sys/dir.h> | |
37 | # endif | |
38 | # ifdef HAVE_NDIR_H | |
39 | # include <ndir.h> | |
40 | # endif | |
41 | #endif | |
252b5132 RH |
42 | #include <signal.h> |
43 | ||
44 | #include <sys/user.h> /* After a.out.h */ | |
45 | ||
46 | #ifdef TRAD_HEADER | |
47 | #include TRAD_HEADER | |
48 | #endif | |
49 | ||
5bff4f56 | 50 | struct trad_core_struct |
252b5132 RH |
51 | { |
52 | asection *data_section; | |
53 | asection *stack_section; | |
54 | asection *reg_section; | |
55 | struct user u; | |
56 | }; | |
57 | ||
58 | #define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u)) | |
59 | #define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section) | |
60 | #define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section) | |
61 | #define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section) | |
62 | ||
63 | /* forward declarations */ | |
64 | ||
65 | const bfd_target *trad_unix_core_file_p PARAMS ((bfd *abfd)); | |
66 | char * trad_unix_core_file_failing_command PARAMS ((bfd *abfd)); | |
67 | int trad_unix_core_file_failing_signal PARAMS ((bfd *abfd)); | |
68 | boolean trad_unix_core_file_matches_executable_p | |
69 | PARAMS ((bfd *core_bfd, bfd *exec_bfd)); | |
70 | static void swap_abort PARAMS ((void)); | |
71 | ||
72 | /* Handle 4.2-style (and perhaps also sysV-style) core dump file. */ | |
73 | ||
74 | /* ARGSUSED */ | |
75 | const bfd_target * | |
76 | trad_unix_core_file_p (abfd) | |
77 | bfd *abfd; | |
78 | ||
79 | { | |
80 | int val; | |
81 | struct user u; | |
82 | struct trad_core_struct *rawptr; | |
83 | ||
84 | #ifdef TRAD_CORE_USER_OFFSET | |
85 | /* If defined, this macro is the file position of the user struct. */ | |
86 | if (bfd_seek (abfd, TRAD_CORE_USER_OFFSET, SEEK_SET) != 0) | |
87 | return 0; | |
88 | #endif | |
5bff4f56 | 89 | |
252b5132 RH |
90 | val = bfd_read ((void *)&u, 1, sizeof u, abfd); |
91 | if (val != sizeof u) | |
92 | { | |
93 | /* Too small to be a core file */ | |
94 | bfd_set_error (bfd_error_wrong_format); | |
95 | return 0; | |
96 | } | |
97 | ||
98 | /* Sanity check perhaps??? */ | |
5bff4f56 | 99 | if (u.u_dsize > 0x1000000) /* Remember, it's in pages... */ |
252b5132 RH |
100 | { |
101 | bfd_set_error (bfd_error_wrong_format); | |
102 | return 0; | |
103 | } | |
104 | if (u.u_ssize > 0x1000000) | |
105 | { | |
106 | bfd_set_error (bfd_error_wrong_format); | |
107 | return 0; | |
108 | } | |
109 | ||
110 | /* Check that the size claimed is no greater than the file size. */ | |
111 | { | |
112 | FILE *stream = bfd_cache_lookup (abfd); | |
113 | struct stat statbuf; | |
114 | if (stream == NULL) | |
115 | return 0; | |
116 | if (fstat (fileno (stream), &statbuf) < 0) | |
117 | { | |
118 | bfd_set_error (bfd_error_system_call); | |
119 | return 0; | |
120 | } | |
7442e600 | 121 | if ((unsigned long) (NBPG * (UPAGES + u.u_dsize |
252b5132 | 122 | #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE |
7442e600 | 123 | - u.u_tsize |
252b5132 | 124 | #endif |
7442e600 ILT |
125 | + u.u_ssize)) |
126 | > (unsigned long) statbuf.st_size) | |
252b5132 | 127 | { |
b35efbcd | 128 | bfd_set_error (bfd_error_wrong_format); |
252b5132 RH |
129 | return 0; |
130 | } | |
131 | #ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE | |
7442e600 | 132 | if ((unsigned long) (NBPG * (UPAGES + u.u_dsize + u.u_ssize) |
252b5132 RH |
133 | #ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED |
134 | /* Some systems write the file too big. */ | |
7442e600 | 135 | + TRAD_CORE_EXTRA_SIZE_ALLOWED |
252b5132 | 136 | #endif |
7442e600 ILT |
137 | ) |
138 | < (unsigned long) statbuf.st_size) | |
252b5132 RH |
139 | { |
140 | /* The file is too big. Maybe it's not a core file | |
141 | or we otherwise have bad values for u_dsize and u_ssize). */ | |
142 | bfd_set_error (bfd_error_wrong_format); | |
143 | return 0; | |
144 | } | |
145 | #endif | |
146 | } | |
147 | ||
148 | /* OK, we believe you. You're a core file (sure, sure). */ | |
149 | ||
150 | /* Allocate both the upage and the struct core_data at once, so | |
151 | a single free() will free them both. */ | |
152 | rawptr = (struct trad_core_struct *) | |
153 | bfd_zmalloc (sizeof (struct trad_core_struct)); | |
154 | if (rawptr == NULL) | |
155 | return 0; | |
5bff4f56 | 156 | |
252b5132 RH |
157 | abfd->tdata.trad_core_data = rawptr; |
158 | ||
159 | rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */ | |
160 | ||
161 | /* Create the sections. This is raunchy, but bfd_close wants to free | |
162 | them separately. */ | |
163 | ||
164 | core_stacksec(abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection)); | |
165 | if (core_stacksec (abfd) == NULL) | |
166 | return NULL; | |
167 | core_datasec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection)); | |
168 | if (core_datasec (abfd) == NULL) | |
169 | return NULL; | |
170 | core_regsec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection)); | |
171 | if (core_regsec (abfd) == NULL) | |
172 | return NULL; | |
173 | ||
174 | core_stacksec (abfd)->name = ".stack"; | |
175 | core_datasec (abfd)->name = ".data"; | |
176 | core_regsec (abfd)->name = ".reg"; | |
177 | ||
178 | core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; | |
179 | core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS; | |
180 | core_regsec (abfd)->flags = SEC_HAS_CONTENTS; | |
181 | ||
182 | core_datasec (abfd)->_raw_size = NBPG * u.u_dsize | |
183 | #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE | |
184 | - NBPG * u.u_tsize | |
185 | #endif | |
186 | ; | |
187 | core_stacksec (abfd)->_raw_size = NBPG * u.u_ssize; | |
188 | core_regsec (abfd)->_raw_size = NBPG * UPAGES; /* Larger than sizeof struct u */ | |
189 | ||
190 | /* What a hack... we'd like to steal it from the exec file, | |
191 | since the upage does not seem to provide it. FIXME. */ | |
192 | #ifdef HOST_DATA_START_ADDR | |
193 | core_datasec (abfd)->vma = HOST_DATA_START_ADDR; | |
194 | #else | |
195 | core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize); | |
196 | #endif | |
197 | ||
198 | #ifdef HOST_STACK_START_ADDR | |
199 | core_stacksec (abfd)->vma = HOST_STACK_START_ADDR; | |
200 | #else | |
201 | core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize); | |
202 | #endif | |
203 | ||
204 | /* This is tricky. As the "register section", we give them the entire | |
205 | upage and stack. u.u_ar0 points to where "register 0" is stored. | |
206 | There are two tricks with this, though. One is that the rest of the | |
207 | registers might be at positive or negative (or both) displacements | |
208 | from *u_ar0. The other is that u_ar0 is sometimes an absolute address | |
209 | in kernel memory, and on other systems it is an offset from the beginning | |
210 | of the `struct user'. | |
5bff4f56 | 211 | |
252b5132 RH |
212 | As a practical matter, we don't know where the registers actually are, |
213 | so we have to pass the whole area to GDB. We encode the value of u_ar0 | |
214 | by setting the .regs section up so that its virtual memory address | |
215 | 0 is at the place pointed to by u_ar0 (by setting the vma of the start | |
216 | of the section to -u_ar0). GDB uses this info to locate the regs, | |
5bff4f56 | 217 | using minor trickery to get around the offset-or-absolute-addr problem. */ |
f6af82bd | 218 | core_regsec (abfd)->vma = - (bfd_vma) u.u_ar0; |
252b5132 RH |
219 | |
220 | core_datasec (abfd)->filepos = NBPG * UPAGES; | |
221 | core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize | |
222 | #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE | |
223 | - NBPG * u.u_tsize | |
224 | #endif | |
225 | ; | |
226 | core_regsec (abfd)->filepos = 0; /* Register segment is the upage */ | |
227 | ||
228 | /* Align to word at least */ | |
229 | core_stacksec (abfd)->alignment_power = 2; | |
230 | core_datasec (abfd)->alignment_power = 2; | |
231 | core_regsec (abfd)->alignment_power = 2; | |
232 | ||
233 | abfd->sections = core_stacksec (abfd); | |
234 | core_stacksec (abfd)->next = core_datasec (abfd); | |
235 | core_datasec (abfd)->next = core_regsec (abfd); | |
236 | abfd->section_count = 3; | |
237 | ||
238 | return abfd->xvec; | |
239 | } | |
240 | ||
241 | char * | |
242 | trad_unix_core_file_failing_command (abfd) | |
243 | bfd *abfd; | |
244 | { | |
245 | #ifndef NO_CORE_COMMAND | |
246 | char *com = abfd->tdata.trad_core_data->u.u_comm; | |
247 | if (*com) | |
248 | return com; | |
249 | else | |
250 | #endif | |
251 | return 0; | |
252 | } | |
253 | ||
254 | /* ARGSUSED */ | |
255 | int | |
256 | trad_unix_core_file_failing_signal (ignore_abfd) | |
7442e600 | 257 | bfd *ignore_abfd ATTRIBUTE_UNUSED; |
252b5132 RH |
258 | { |
259 | #ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL | |
260 | return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd); | |
261 | #else | |
262 | return -1; /* FIXME, where is it? */ | |
263 | #endif | |
264 | } | |
265 | ||
266 | /* ARGSUSED */ | |
267 | boolean | |
268 | trad_unix_core_file_matches_executable_p (core_bfd, exec_bfd) | |
7442e600 ILT |
269 | bfd *core_bfd ATTRIBUTE_UNUSED; |
270 | bfd *exec_bfd ATTRIBUTE_UNUSED; | |
252b5132 RH |
271 | { |
272 | return true; /* FIXME, We have no way of telling at this point */ | |
273 | } | |
274 | \f | |
275 | /* If somebody calls any byte-swapping routines, shoot them. */ | |
276 | static void | |
5bff4f56 | 277 | swap_abort () |
252b5132 | 278 | { |
5bff4f56 | 279 | abort (); /* This way doesn't require any declaration for ANSI to fuck up */ |
252b5132 RH |
280 | } |
281 | #define NO_GET ((bfd_vma (*) PARAMS (( const bfd_byte *))) swap_abort ) | |
282 | #define NO_PUT ((void (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort ) | |
283 | #define NO_SIGNED_GET \ | |
284 | ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort ) | |
285 | ||
286 | const bfd_target trad_core_vec = | |
287 | { | |
288 | "trad-core", | |
289 | bfd_target_unknown_flavour, | |
290 | BFD_ENDIAN_UNKNOWN, /* target byte order */ | |
291 | BFD_ENDIAN_UNKNOWN, /* target headers byte order */ | |
292 | (HAS_RELOC | EXEC_P | /* object flags */ | |
293 | HAS_LINENO | HAS_DEBUG | | |
294 | HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED), | |
295 | (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */ | |
296 | 0, /* symbol prefix */ | |
297 | ' ', /* ar_pad_char */ | |
298 | 16, /* ar_max_namelen */ | |
299 | NO_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit data */ | |
300 | NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit data */ | |
301 | NO_GET, NO_SIGNED_GET, NO_PUT, /* 16 bit data */ | |
302 | NO_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit hdrs */ | |
303 | NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit hdrs */ | |
304 | NO_GET, NO_SIGNED_GET, NO_PUT, /* 16 bit hdrs */ | |
305 | ||
306 | { /* bfd_check_format */ | |
307 | _bfd_dummy_target, /* unknown format */ | |
308 | _bfd_dummy_target, /* object file */ | |
309 | _bfd_dummy_target, /* archive */ | |
310 | trad_unix_core_file_p /* a core file */ | |
311 | }, | |
312 | { /* bfd_set_format */ | |
313 | bfd_false, bfd_false, | |
314 | bfd_false, bfd_false | |
315 | }, | |
316 | { /* bfd_write_contents */ | |
317 | bfd_false, bfd_false, | |
318 | bfd_false, bfd_false | |
319 | }, | |
5bff4f56 | 320 | |
252b5132 RH |
321 | BFD_JUMP_TABLE_GENERIC (_bfd_generic), |
322 | BFD_JUMP_TABLE_COPY (_bfd_generic), | |
323 | BFD_JUMP_TABLE_CORE (trad_unix), | |
324 | BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive), | |
325 | BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols), | |
326 | BFD_JUMP_TABLE_RELOCS (_bfd_norelocs), | |
327 | BFD_JUMP_TABLE_WRITE (_bfd_generic), | |
328 | BFD_JUMP_TABLE_LINK (_bfd_nolink), | |
329 | BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic), | |
330 | ||
c3c89269 | 331 | NULL, |
5bff4f56 | 332 | |
252b5132 RH |
333 | (PTR) 0 /* backend_data */ |
334 | }; |