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[binutils.git] / bfd / trad-core.c
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1 /* BFD back end for traditional Unix core files (U-area and raw sections)
2 Copyright 1988, 1989, 1991, 1992, 1993, 1994, 1995, 1996, 1998, 1999,
3 2000, 2001, 2002, 2003, 2004, 2005
4 Free Software Foundation, Inc.
5 Written by John Gilmore of Cygnus Support.
7 This file is part of BFD, the Binary File Descriptor library.
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.
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.
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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
23 #include "bfd.h"
24 #include "sysdep.h"
25 #include "libbfd.h"
26 #include "libaout.h" /* BFD a.out internal data structures */
28 #include <sys/param.h>
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
42 #include <signal.h>
44 #include <sys/user.h> /* After a.out.h */
46 #ifdef TRAD_HEADER
47 #include TRAD_HEADER
48 #endif
50 struct trad_core_struct
52 asection *data_section;
53 asection *stack_section;
54 asection *reg_section;
55 struct user u;
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)
63 /* forward declarations */
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 bfd_boolean trad_unix_core_file_matches_executable_p
69 PARAMS ((bfd *core_bfd, bfd *exec_bfd));
70 static void swap_abort PARAMS ((void));
72 /* Handle 4.2-style (and perhaps also sysV-style) core dump file. */
74 const bfd_target *
75 trad_unix_core_file_p (abfd)
76 bfd *abfd;
79 int val;
80 struct user u;
81 struct trad_core_struct *rawptr;
82 bfd_size_type amt;
84 #ifdef TRAD_CORE_USER_OFFSET
85 /* If defined, this macro is the file position of the user struct. */
86 if (bfd_seek (abfd, (file_ptr) TRAD_CORE_USER_OFFSET, SEEK_SET) != 0)
87 return 0;
88 #endif
90 val = bfd_bread ((void *) &u, (bfd_size_type) sizeof u, abfd);
91 if (val != sizeof u)
93 /* Too small to be a core file */
94 bfd_set_error (bfd_error_wrong_format);
95 return 0;
98 /* Sanity check perhaps??? */
99 if (u.u_dsize > 0x1000000) /* Remember, it's in pages... */
101 bfd_set_error (bfd_error_wrong_format);
102 return 0;
104 if (u.u_ssize > 0x1000000)
106 bfd_set_error (bfd_error_wrong_format);
107 return 0;
110 /* Check that the size claimed is no greater than the file size. */
112 struct stat statbuf;
114 if (bfd_stat (abfd, &statbuf) < 0)
115 return 0;
117 if ((unsigned long) (NBPG * (UPAGES + u.u_dsize
118 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
119 - u.u_tsize
120 #endif
121 + u.u_ssize))
122 > (unsigned long) statbuf.st_size)
124 bfd_set_error (bfd_error_wrong_format);
125 return 0;
127 #ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE
128 if ((unsigned long) (NBPG * (UPAGES + u.u_dsize + u.u_ssize)
129 #ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED
130 /* Some systems write the file too big. */
131 + TRAD_CORE_EXTRA_SIZE_ALLOWED
132 #endif
134 < (unsigned long) statbuf.st_size)
136 /* The file is too big. Maybe it's not a core file
137 or we otherwise have bad values for u_dsize and u_ssize). */
138 bfd_set_error (bfd_error_wrong_format);
139 return 0;
141 #endif
144 /* OK, we believe you. You're a core file (sure, sure). */
146 /* Allocate both the upage and the struct core_data at once, so
147 a single free() will free them both. */
148 amt = sizeof (struct trad_core_struct);
149 rawptr = (struct trad_core_struct *) bfd_zmalloc (amt);
150 if (rawptr == NULL)
151 return 0;
153 abfd->tdata.trad_core_data = rawptr;
155 rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
157 /* Create the sections. */
159 core_stacksec(abfd) = bfd_make_section_anyway (abfd, ".stack");
160 if (core_stacksec (abfd) == NULL)
161 goto fail;
162 core_datasec (abfd) = bfd_make_section_anyway (abfd, ".data");
163 if (core_datasec (abfd) == NULL)
164 goto fail;
165 core_regsec (abfd) = bfd_make_section_anyway (abfd, ".reg");
166 if (core_regsec (abfd) == NULL)
167 goto fail;
169 core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
170 core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
171 core_regsec (abfd)->flags = SEC_HAS_CONTENTS;
173 core_datasec (abfd)->size = NBPG * u.u_dsize
174 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
175 - NBPG * u.u_tsize
176 #endif
178 core_stacksec (abfd)->size = NBPG * u.u_ssize;
179 core_regsec (abfd)->size = NBPG * UPAGES; /* Larger than sizeof struct u */
181 /* What a hack... we'd like to steal it from the exec file,
182 since the upage does not seem to provide it. FIXME. */
183 #ifdef HOST_DATA_START_ADDR
184 core_datasec (abfd)->vma = HOST_DATA_START_ADDR;
185 #else
186 core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize);
187 #endif
189 #ifdef HOST_STACK_START_ADDR
190 core_stacksec (abfd)->vma = HOST_STACK_START_ADDR;
191 #else
192 core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize);
193 #endif
195 /* This is tricky. As the "register section", we give them the entire
196 upage and stack. u.u_ar0 points to where "register 0" is stored.
197 There are two tricks with this, though. One is that the rest of the
198 registers might be at positive or negative (or both) displacements
199 from *u_ar0. The other is that u_ar0 is sometimes an absolute address
200 in kernel memory, and on other systems it is an offset from the beginning
201 of the `struct user'.
203 As a practical matter, we don't know where the registers actually are,
204 so we have to pass the whole area to GDB. We encode the value of u_ar0
205 by setting the .regs section up so that its virtual memory address
206 0 is at the place pointed to by u_ar0 (by setting the vma of the start
207 of the section to -u_ar0). GDB uses this info to locate the regs,
208 using minor trickery to get around the offset-or-absolute-addr problem. */
209 core_regsec (abfd)->vma = - (bfd_vma) (unsigned long) u.u_ar0;
211 core_datasec (abfd)->filepos = NBPG * UPAGES;
212 core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize
213 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
214 - NBPG * u.u_tsize
215 #endif
217 core_regsec (abfd)->filepos = 0; /* Register segment is the upage */
219 /* Align to word at least */
220 core_stacksec (abfd)->alignment_power = 2;
221 core_datasec (abfd)->alignment_power = 2;
222 core_regsec (abfd)->alignment_power = 2;
224 return abfd->xvec;
226 fail:
227 bfd_release (abfd, abfd->tdata.any);
228 abfd->tdata.any = NULL;
229 bfd_section_list_clear (abfd);
230 return NULL;
233 char *
234 trad_unix_core_file_failing_command (abfd)
235 bfd *abfd;
237 #ifndef NO_CORE_COMMAND
238 char *com = abfd->tdata.trad_core_data->u.u_comm;
239 if (*com)
240 return com;
241 else
242 #endif
243 return 0;
247 trad_unix_core_file_failing_signal (ignore_abfd)
248 bfd *ignore_abfd ATTRIBUTE_UNUSED;
250 #ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL
251 return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd);
252 #else
253 return -1; /* FIXME, where is it? */
254 #endif
257 bfd_boolean
258 trad_unix_core_file_matches_executable_p (core_bfd, exec_bfd)
259 bfd *core_bfd ATTRIBUTE_UNUSED;
260 bfd *exec_bfd ATTRIBUTE_UNUSED;
262 return TRUE; /* FIXME, We have no way of telling at this point */
265 /* If somebody calls any byte-swapping routines, shoot them. */
266 static void
267 swap_abort ()
269 abort (); /* This way doesn't require any declaration for ANSI to fuck up */
272 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
273 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
274 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
275 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
276 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
277 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
279 const bfd_target trad_core_vec =
281 "trad-core",
282 bfd_target_unknown_flavour,
283 BFD_ENDIAN_UNKNOWN, /* target byte order */
284 BFD_ENDIAN_UNKNOWN, /* target headers byte order */
285 (HAS_RELOC | EXEC_P | /* object flags */
286 HAS_LINENO | HAS_DEBUG |
287 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
288 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
289 0, /* symbol prefix */
290 ' ', /* ar_pad_char */
291 16, /* ar_max_namelen */
292 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */
293 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */
294 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */
295 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */
296 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */
297 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */
299 { /* bfd_check_format */
300 _bfd_dummy_target, /* unknown format */
301 _bfd_dummy_target, /* object file */
302 _bfd_dummy_target, /* archive */
303 trad_unix_core_file_p /* a core file */
305 { /* bfd_set_format */
306 bfd_false, bfd_false,
307 bfd_false, bfd_false
309 { /* bfd_write_contents */
310 bfd_false, bfd_false,
311 bfd_false, bfd_false
314 BFD_JUMP_TABLE_GENERIC (_bfd_generic),
315 BFD_JUMP_TABLE_COPY (_bfd_generic),
316 BFD_JUMP_TABLE_CORE (trad_unix),
317 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
318 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
319 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
320 BFD_JUMP_TABLE_WRITE (_bfd_generic),
321 BFD_JUMP_TABLE_LINK (_bfd_nolink),
322 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
324 NULL,
326 (PTR) 0 /* backend_data */