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[binutils.git] / bfd / trad-core.c
blobe34851431855039f9921300e3a7dd74632b1d885
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, 2006, 2007
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 3 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,
22 MA 02110-1301, USA. */
24 #include "sysdep.h"
25 #include "bfd.h"
26 #include "libbfd.h"
27 #include "libaout.h" /* BFD a.out internal data structures */
29 #include <sys/param.h>
30 #ifdef HAVE_DIRENT_H
31 # include <dirent.h>
32 #else
33 # ifdef HAVE_SYS_NDIR_H
34 # include <sys/ndir.h>
35 # endif
36 # ifdef HAVE_SYS_DIR_H
37 # include <sys/dir.h>
38 # endif
39 # ifdef HAVE_NDIR_H
40 # include <ndir.h>
41 # endif
42 #endif
43 #include <signal.h>
45 #include <sys/user.h> /* After a.out.h */
47 #ifdef TRAD_HEADER
48 #include TRAD_HEADER
49 #endif
51 #ifndef NBPG
52 # define NBPG getpagesize()
53 #endif
55 struct trad_core_struct
57 asection *data_section;
58 asection *stack_section;
59 asection *reg_section;
60 struct user u;
63 #define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u))
64 #define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section)
65 #define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section)
66 #define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section)
68 /* forward declarations */
70 const bfd_target *trad_unix_core_file_p PARAMS ((bfd *abfd));
71 char * trad_unix_core_file_failing_command PARAMS ((bfd *abfd));
72 int trad_unix_core_file_failing_signal PARAMS ((bfd *abfd));
73 #define trad_unix_core_file_matches_executable_p generic_core_file_matches_executable_p
74 static void swap_abort PARAMS ((void));
76 /* Handle 4.2-style (and perhaps also sysV-style) core dump file. */
78 const bfd_target *
79 trad_unix_core_file_p (abfd)
80 bfd *abfd;
83 int val;
84 struct user u;
85 struct trad_core_struct *rawptr;
86 bfd_size_type amt;
87 flagword flags;
89 #ifdef TRAD_CORE_USER_OFFSET
90 /* If defined, this macro is the file position of the user struct. */
91 if (bfd_seek (abfd, (file_ptr) TRAD_CORE_USER_OFFSET, SEEK_SET) != 0)
92 return 0;
93 #endif
95 val = bfd_bread ((void *) &u, (bfd_size_type) sizeof u, abfd);
96 if (val != sizeof u)
98 /* Too small to be a core file */
99 bfd_set_error (bfd_error_wrong_format);
100 return 0;
103 /* Sanity check perhaps??? */
104 if (u.u_dsize > 0x1000000) /* Remember, it's in pages... */
106 bfd_set_error (bfd_error_wrong_format);
107 return 0;
109 if (u.u_ssize > 0x1000000)
111 bfd_set_error (bfd_error_wrong_format);
112 return 0;
115 /* Check that the size claimed is no greater than the file size. */
117 struct stat statbuf;
119 if (bfd_stat (abfd, &statbuf) < 0)
120 return 0;
122 if ((ufile_ptr) NBPG * (UPAGES + u.u_dsize
123 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
124 - u.u_tsize
125 #endif
126 + u.u_ssize)
127 > (ufile_ptr) statbuf.st_size)
129 bfd_set_error (bfd_error_wrong_format);
130 return 0;
132 #ifndef TRAD_CORE_ALLOW_ANY_EXTRA_SIZE
133 if (((ufile_ptr) NBPG * (UPAGES + u.u_dsize + u.u_ssize)
134 #ifdef TRAD_CORE_EXTRA_SIZE_ALLOWED
135 /* Some systems write the file too big. */
136 + TRAD_CORE_EXTRA_SIZE_ALLOWED
137 #endif
139 < (ufile_ptr) statbuf.st_size)
141 /* The file is too big. Maybe it's not a core file
142 or we otherwise have bad values for u_dsize and u_ssize). */
143 bfd_set_error (bfd_error_wrong_format);
144 return 0;
146 #endif
149 /* OK, we believe you. You're a core file (sure, sure). */
151 /* Allocate both the upage and the struct core_data at once, so
152 a single free() will free them both. */
153 amt = sizeof (struct trad_core_struct);
154 rawptr = (struct trad_core_struct *) bfd_zmalloc (amt);
155 if (rawptr == NULL)
156 return 0;
158 abfd->tdata.trad_core_data = rawptr;
160 rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
162 /* Create the sections. */
164 flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
165 core_stacksec(abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack",
166 flags);
167 if (core_stacksec (abfd) == NULL)
168 goto fail;
169 core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data",
170 flags);
171 if (core_datasec (abfd) == NULL)
172 goto fail;
173 core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg",
174 SEC_HAS_CONTENTS);
175 if (core_regsec (abfd) == NULL)
176 goto fail;
178 core_datasec (abfd)->size = NBPG * u.u_dsize
179 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
180 - NBPG * u.u_tsize
181 #endif
183 core_stacksec (abfd)->size = NBPG * u.u_ssize;
184 core_regsec (abfd)->size = NBPG * UPAGES; /* Larger than sizeof struct u */
186 /* What a hack... we'd like to steal it from the exec file,
187 since the upage does not seem to provide it. FIXME. */
188 #ifdef HOST_DATA_START_ADDR
189 core_datasec (abfd)->vma = HOST_DATA_START_ADDR;
190 #else
191 core_datasec (abfd)->vma = HOST_TEXT_START_ADDR + (NBPG * u.u_tsize);
192 #endif
194 #ifdef HOST_STACK_START_ADDR
195 core_stacksec (abfd)->vma = HOST_STACK_START_ADDR;
196 #else
197 core_stacksec (abfd)->vma = HOST_STACK_END_ADDR - (NBPG * u.u_ssize);
198 #endif
200 /* This is tricky. As the "register section", we give them the entire
201 upage and stack. u.u_ar0 points to where "register 0" is stored.
202 There are two tricks with this, though. One is that the rest of the
203 registers might be at positive or negative (or both) displacements
204 from *u_ar0. The other is that u_ar0 is sometimes an absolute address
205 in kernel memory, and on other systems it is an offset from the beginning
206 of the `struct user'.
208 As a practical matter, we don't know where the registers actually are,
209 so we have to pass the whole area to GDB. We encode the value of u_ar0
210 by setting the .regs section up so that its virtual memory address
211 0 is at the place pointed to by u_ar0 (by setting the vma of the start
212 of the section to -u_ar0). GDB uses this info to locate the regs,
213 using minor trickery to get around the offset-or-absolute-addr problem. */
214 core_regsec (abfd)->vma = - (bfd_vma) (unsigned long) u.u_ar0;
216 core_datasec (abfd)->filepos = NBPG * UPAGES;
217 core_stacksec (abfd)->filepos = (NBPG * UPAGES) + NBPG * u.u_dsize
218 #ifdef TRAD_CORE_DSIZE_INCLUDES_TSIZE
219 - NBPG * u.u_tsize
220 #endif
222 core_regsec (abfd)->filepos = 0; /* Register segment is the upage */
224 /* Align to word at least */
225 core_stacksec (abfd)->alignment_power = 2;
226 core_datasec (abfd)->alignment_power = 2;
227 core_regsec (abfd)->alignment_power = 2;
229 return abfd->xvec;
231 fail:
232 bfd_release (abfd, abfd->tdata.any);
233 abfd->tdata.any = NULL;
234 bfd_section_list_clear (abfd);
235 return NULL;
238 char *
239 trad_unix_core_file_failing_command (abfd)
240 bfd *abfd;
242 #ifndef NO_CORE_COMMAND
243 char *com = abfd->tdata.trad_core_data->u.u_comm;
244 if (*com)
245 return com;
246 else
247 #endif
248 return 0;
252 trad_unix_core_file_failing_signal (ignore_abfd)
253 bfd *ignore_abfd ATTRIBUTE_UNUSED;
255 #ifdef TRAD_UNIX_CORE_FILE_FAILING_SIGNAL
256 return TRAD_UNIX_CORE_FILE_FAILING_SIGNAL(ignore_abfd);
257 #else
258 return -1; /* FIXME, where is it? */
259 #endif
262 /* If somebody calls any byte-swapping routines, shoot them. */
263 static void
264 swap_abort ()
266 abort (); /* This way doesn't require any declaration for ANSI to fuck up */
269 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
270 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
271 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
272 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
273 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
274 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
276 const bfd_target trad_core_vec =
278 "trad-core",
279 bfd_target_unknown_flavour,
280 BFD_ENDIAN_UNKNOWN, /* target byte order */
281 BFD_ENDIAN_UNKNOWN, /* target headers byte order */
282 (HAS_RELOC | EXEC_P | /* object flags */
283 HAS_LINENO | HAS_DEBUG |
284 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
285 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
286 0, /* symbol prefix */
287 ' ', /* ar_pad_char */
288 16, /* ar_max_namelen */
289 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */
290 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */
291 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */
292 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */
293 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */
294 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */
296 { /* bfd_check_format */
297 _bfd_dummy_target, /* unknown format */
298 _bfd_dummy_target, /* object file */
299 _bfd_dummy_target, /* archive */
300 trad_unix_core_file_p /* a core file */
302 { /* bfd_set_format */
303 bfd_false, bfd_false,
304 bfd_false, bfd_false
306 { /* bfd_write_contents */
307 bfd_false, bfd_false,
308 bfd_false, bfd_false
311 BFD_JUMP_TABLE_GENERIC (_bfd_generic),
312 BFD_JUMP_TABLE_COPY (_bfd_generic),
313 BFD_JUMP_TABLE_CORE (trad_unix),
314 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
315 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
316 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
317 BFD_JUMP_TABLE_WRITE (_bfd_generic),
318 BFD_JUMP_TABLE_LINK (_bfd_nolink),
319 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
321 NULL,
323 (PTR) 0 /* backend_data */