source: trunk/src/binutils/bfd/sco5-core.c@ 610

Last change on this file since 610 was 610, checked in by bird, 22 years ago

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1/* BFD back end for SCO5 core files (U-area and raw sections)
2 Copyright 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
3 Written by Jouke Numan <[email protected]>
4
5This file is part of BFD, the Binary File Descriptor library.
6
7This program is free software; you can redistribute it and/or modify
8it under the terms of the GNU General Public License as published by
9the Free Software Foundation; either version 2 of the License, or
10(at your option) any later version.
11
12This program is distributed in the hope that it will be useful,
13but WITHOUT ANY WARRANTY; without even the implied warranty of
14MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15GNU General Public License for more details.
16
17You should have received a copy of the GNU General Public License
18along with this program; if not, write to the Free Software
19Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
20
21#include "bfd.h"
22#include "sysdep.h"
23#include "libbfd.h"
24#include "libaout.h" /* BFD a.out internal data structures */
25
26#include <stdio.h>
27#include <sys/types.h>
28#include <sys/param.h>
29#include <sys/dir.h>
30#include <signal.h>
31
32#include <sys/user.h> /* After a.out.h */
33#include <sys/paccess.h>
34#include <sys/region.h>
35
36struct sco5_core_struct
37{
38 struct user u;
39};
40
41/* forward declarations */
42
43static asection *make_bfd_asection
44 PARAMS ((bfd *, const char *, flagword, bfd_size_type, bfd_vma, file_ptr));
45static struct user *read_uarea PARAMS ((bfd *, int));
46const bfd_target *sco5_core_file_p PARAMS ((bfd *abfd));
47char *sco5_core_file_failing_command PARAMS ((bfd *abfd));
48int sco5_core_file_failing_signal PARAMS ((bfd *abfd));
49bfd_boolean sco5_core_file_matches_executable_p
50 PARAMS ((bfd *core_bfd, bfd *exec_bfd));
51static void swap_abort PARAMS ((void));
52
53static asection *
54make_bfd_asection (abfd, name, flags, _raw_size, vma, filepos)
55 bfd *abfd;
56 const char *name;
57 flagword flags;
58 bfd_size_type _raw_size;
59 bfd_vma vma;
60 file_ptr filepos;
61{
62 asection *asect;
63
64 asect = bfd_make_section_anyway (abfd, name);
65 if (!asect)
66 return NULL;
67 asect->flags = flags;
68 asect->_raw_size = _raw_size;
69 asect->vma = vma;
70 asect->filepos = filepos;
71 asect->alignment_power = 2;
72
73 return asect;
74}
75
76static struct user *
77read_uarea(abfd, filepos)
78 bfd *abfd;
79 int filepos;
80
81{
82 struct sco5_core_struct *rawptr;
83 bfd_size_type amt = sizeof (struct sco5_core_struct);
84
85 rawptr = (struct sco5_core_struct *) bfd_zmalloc (amt);
86 if (rawptr == NULL)
87 return NULL;
88
89 abfd->tdata.sco5_core_data = rawptr;
90
91 if (bfd_seek (abfd, (file_ptr) filepos, SEEK_SET) != 0
92 || bfd_bread ((void *) &rawptr->u, (bfd_size_type) sizeof rawptr->u,
93 abfd) != sizeof rawptr->u)
94 {
95 bfd_set_error (bfd_error_wrong_format);
96 return NULL;
97 }
98
99 /* Sanity check perhaps??? */
100 if (rawptr->u.u_dsize > 0x1000000) /* Remember, it's in pages... */
101 {
102 bfd_set_error (bfd_error_wrong_format);
103 return NULL;
104 }
105 if (rawptr->u.u_ssize > 0x1000000)
106 {
107 bfd_set_error (bfd_error_wrong_format);
108 return NULL;
109 }
110 return &rawptr->u;
111}
112
113/* ARGSUSED */
114const bfd_target *
115sco5_core_file_p (abfd)
116 bfd *abfd;
117{
118 int coffset_siz, val, nsecs, cheadoffs;
119 int coresize;
120 struct user *u;
121 struct coreoffsets coffsets;
122 struct coresecthead chead;
123 char *secname;
124 flagword flags;
125
126 /* Read coreoffsets region at end of core (see core(FP)) */
127
128 {
129 FILE *stream = bfd_cache_lookup (abfd);
130 struct stat statbuf;
131 if (stream == NULL)
132 return NULL;
133 if (fstat (fileno (stream), &statbuf) < 0)
134 {
135 bfd_set_error (bfd_error_system_call);
136 return NULL;
137 }
138 coresize = statbuf.st_size;
139 }
140 /* Last long in core is sizeof struct coreoffsets, read it */
141 if ((bfd_seek (abfd, (file_ptr) (coresize - sizeof coffset_siz),
142 SEEK_SET) != 0)
143 || bfd_bread ((void *) &coffset_siz, (bfd_size_type) sizeof coffset_siz,
144 abfd) != sizeof coffset_siz)
145 {
146 bfd_set_error (bfd_error_wrong_format);
147 return NULL;
148 }
149
150 /* Use it to seek start of coreoffsets region, read it and determine
151 validity */
152 if ((bfd_seek (abfd, (file_ptr) (coresize - coffset_siz), SEEK_SET) != 0)
153 || (bfd_bread ((void *) &coffsets, (bfd_size_type) sizeof coffsets, abfd)
154 != sizeof coffsets)
155 || ((coffsets.u_info != 1) && (coffsets.u_info != C_VERSION)))
156 {
157 bfd_set_error (bfd_error_wrong_format);
158 return NULL;
159 }
160
161 if (coffsets.u_info == 1)
162 {
163 /* Old version, no section heads, read info from user struct */
164
165 u = read_uarea (abfd, coffsets.u_user);
166 if (! u)
167 goto fail;
168
169 if (!make_bfd_asection (abfd, ".reg", SEC_HAS_CONTENTS,
170 (bfd_size_type) coffsets.u_usize,
171 0 - (bfd_vma) u->u_ar0,
172 (file_ptr) coffsets.u_user))
173 goto fail;
174
175 if (!make_bfd_asection (abfd, ".data",
176 SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
177 ((bfd_size_type) u->u_exdata.ux_dsize
178 + u->u_exdata.ux_bsize),
179 (bfd_vma) u->u_exdata.ux_datorg,
180 (file_ptr) coffsets.u_data))
181 goto fail;
182
183 if (!make_bfd_asection (abfd, ".stack",
184 SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
185 (bfd_size_type) u->u_ssize * NBPC,
186 (bfd_vma) u->u_sub,
187 (file_ptr) coffsets.u_stack))
188 goto fail;
189
190 return abfd->xvec; /* Done for version 1 */
191 }
192
193 /* Immediately before coreoffsets region is a long with offset in core
194 to first coresecthead (CORES_OFFSETS), the long before this is the
195 number of section heads in the list. Read both longs and read the
196 coresecthead and check its validity */
197
198 if ((bfd_seek (abfd,
199 (file_ptr) (coresize - coffset_siz - 2 * sizeof coffset_siz),
200 SEEK_SET) != 0)
201 || (bfd_bread ((void *) &nsecs, (bfd_size_type) sizeof nsecs, abfd)
202 != sizeof nsecs)
203 || (bfd_bread ((void *) &cheadoffs, (bfd_size_type) sizeof cheadoffs,
204 abfd) != sizeof cheadoffs)
205 || (bfd_seek (abfd, (file_ptr) cheadoffs, SEEK_SET) != 0)
206 || (bfd_bread ((void *) &chead, (bfd_size_type) sizeof chead, abfd)
207 != sizeof chead)
208 || (chead.cs_stype != CORES_OFFSETS)
209 || (chead.cs_x.csx_magic != COREMAGIC_NUMBER))
210 {
211 bfd_set_error (bfd_error_wrong_format);
212 goto fail;
213 }
214
215 /* OK, we believe you. You're a core file (sure, sure). */
216
217 /* Now loop over all regions and map them */
218 nsecs--; /* We've seen CORES_OFFSETS already */
219 for (; nsecs; nsecs--)
220 {
221 if ((bfd_seek (abfd, (file_ptr) chead.cs_hseek, SEEK_SET) != 0)
222 || (bfd_bread ((void *) &chead, (bfd_size_type) sizeof chead, abfd)
223 != sizeof chead))
224 {
225 bfd_set_error (bfd_error_wrong_format);
226 goto fail;
227 }
228
229 switch (chead.cs_stype)
230 {
231 case CORES_MAGIC: /* Core header, check magic */
232 if (chead.cs_x.csx_magic != COREMAGIC_NUMBER)
233 {
234 bfd_set_error (bfd_error_wrong_format);
235 goto fail;
236 }
237 secname = NULL;
238 nsecs++; /* MAGIC not in section cnt!*/
239 break;
240 case CORES_UAREA: /* U-area, read in tdata */
241 u = read_uarea (abfd, chead.cs_sseek);
242 if (! u)
243 goto fail;
244
245 /* This is tricky. As the "register section", we give them
246 the entire upage and stack. u.u_ar0 points to where
247 "register 0" is stored. There are two tricks with this,
248 though. One is that the rest of the registers might be
249 at positive or negative (or both) displacements from
250 *u_ar0. The other is that u_ar0 is sometimes an absolute
251 address in kernel memory, and on other systems it is an
252 offset from the beginning of the `struct user'.
253
254 As a practical matter, we don't know where the registers
255 actually are, so we have to pass the whole area to GDB.
256 We encode the value of u_ar0 by setting the .regs section
257 up so that its virtual memory address 0 is at the place
258 pointed to by u_ar0 (by setting the vma of the start of
259 the section to -u_ar0). GDB uses this info to locate the
260 regs, using minor trickery to get around the
261 offset-or-absolute-addr problem. */
262
263 chead.cs_vaddr = 0 - (bfd_vma) u->u_ar0;
264
265 secname = ".reg";
266 flags = SEC_HAS_CONTENTS;
267
268 break;
269 case CORES_PREGION: /* A program region, map it */
270 switch (chead.cs_x.csx_preg.csxp_rtyp)
271 {
272 case PT_DATA:
273 secname = ".data"; /* Data region. */
274 break;
275 case PT_STACK:
276 secname = ".stack"; /* Stack region. */
277 break;
278 case PT_SHMEM:
279 secname = ".shmem"; /* Shared memory */
280 break;
281 case PT_LIBDAT:
282 secname = ".libdat"; /* Shared library data */
283 break;
284 case PT_V86:
285 secname = ".virt86"; /* Virtual 8086 mode */
286 break;
287 case PT_SHFIL:
288 secname = ".mmfile"; /* Memory mapped file */
289 break;
290 case PT_XDATA0:
291 secname = ".Xdat0"; /* XENIX data region, virtual 0 */
292 break;
293 default:
294 secname = "";
295 }
296 flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
297 break;
298 case CORES_PROC: /* struct proc */
299 case CORES_ITIMER: /* interval timers */
300 case CORES_SCOUTSNAME: /* struct scoutsname */
301 secname = NULL; /* Ignore these */
302 break;
303 default:
304 (*_bfd_error_handler) ("Unhandled SCO core file section type %d\n",
305 chead.cs_stype);
306 continue;
307 }
308
309 if (secname
310 && !make_bfd_asection (abfd, secname, flags,
311 (bfd_size_type) chead.cs_vsize,
312 (bfd_vma) chead.cs_vaddr,
313 (file_ptr) chead.cs_sseek))
314 goto fail;
315
316 }
317
318 return abfd->xvec;
319
320 fail:
321 if (abfd->tdata.any)
322 {
323 bfd_release (abfd, abfd->tdata.any);
324 abfd->tdata.any = NULL;
325 }
326 bfd_section_list_clear (abfd);
327 return NULL;
328}
329
330char *
331sco5_core_file_failing_command (abfd)
332 bfd *abfd;
333{
334 char *com = abfd->tdata.sco5_core_data->u.u_comm;
335 if (*com)
336 return com;
337 else
338 return NULL;
339}
340
341/* ARGSUSED */
342int
343sco5_core_file_failing_signal (ignore_abfd)
344 bfd *ignore_abfd;
345{
346 return ((ignore_abfd->tdata.sco5_core_data->u.u_sysabort != 0)
347 ? ignore_abfd->tdata.sco5_core_data->u.u_sysabort
348 : -1);
349}
350
351/* ARGSUSED */
352bfd_boolean
353sco5_core_file_matches_executable_p (core_bfd, exec_bfd)
354 bfd *core_bfd ATTRIBUTE_UNUSED;
355 bfd *exec_bfd ATTRIBUTE_UNUSED;
356{
357 return TRUE; /* FIXME, We have no way of telling at this point */
358}
359
360/* If somebody calls any byte-swapping routines, shoot them. */
361static void
362swap_abort ()
363{
364 abort (); /* This way doesn't require any declaration for ANSI to fuck up */
365}
366#define NO_GET ((bfd_vma (*) PARAMS (( const bfd_byte *))) swap_abort )
367#define NO_PUT ((void (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort )
368#define NO_SIGNED_GET \
369 ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort )
370
371const bfd_target sco5_core_vec =
372 {
373 "sco5-core",
374 bfd_target_unknown_flavour,
375 BFD_ENDIAN_LITTLE, /* target byte order */
376 BFD_ENDIAN_LITTLE, /* target headers byte order */
377 (HAS_RELOC | EXEC_P | /* object flags */
378 HAS_LINENO | HAS_DEBUG |
379 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
380 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
381 0, /* symbol prefix */
382 ' ', /* ar_pad_char */
383 16, /* ar_max_namelen */
384 NO_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit data */
385 NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit data */
386 NO_GET, NO_SIGNED_GET, NO_PUT, /* 16 bit data */
387 NO_GET, NO_SIGNED_GET, NO_PUT, /* 64 bit hdrs */
388 NO_GET, NO_SIGNED_GET, NO_PUT, /* 32 bit hdrs */
389 NO_GET, NO_SIGNED_GET, NO_PUT, /* 16 bit hdrs */
390
391 { /* bfd_check_format */
392 _bfd_dummy_target, /* unknown format */
393 _bfd_dummy_target, /* object file */
394 _bfd_dummy_target, /* archive */
395 sco5_core_file_p /* a core file */
396 },
397 { /* bfd_set_format */
398 bfd_false, bfd_false,
399 bfd_false, bfd_false
400 },
401 { /* bfd_write_contents */
402 bfd_false, bfd_false,
403 bfd_false, bfd_false
404 },
405
406 BFD_JUMP_TABLE_GENERIC (_bfd_generic),
407 BFD_JUMP_TABLE_COPY (_bfd_generic),
408 BFD_JUMP_TABLE_CORE (sco5),
409 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
410 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
411 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
412 BFD_JUMP_TABLE_WRITE (_bfd_generic),
413 BFD_JUMP_TABLE_LINK (_bfd_nolink),
414 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
415
416 NULL,
417
418 (PTR) 0 /* backend_data */
419};
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