1 /* BFD back-end for HP/UX core files.
2 Copyright 1993, 1994, 1996, 1998, 1999, 2001, 2002, 2003, 2004
3 Free Software Foundation, Inc.
4 Written by Stu Grossman, Cygnus Support.
5 Converted to back-end form by Ian Lance Taylor, 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
22
23 /* This file can only be compiled on systems which use HP/UX style
24 core files. */
25
26 #include "bfd.h"
27 #include "sysdep.h"
28 #include "libbfd.h"
29
30 #if defined (HOST_HPPAHPUX) || defined (HOST_HP300HPUX) || defined (HOST_HPPAMPEIX)
31
32 /* FIXME: sys/core.h doesn't exist for HPUX version 7. HPUX version
33 5, 6, and 7 core files seem to be standard trad-core.c type core
34 files; can we just use trad-core.c in addition to this file? */
35
36 #include <sys/core.h>
37 #include <sys/utsname.h>
38
39 #endif /* HOST_HPPAHPUX */
40
41 #ifdef HOST_HPPABSD
42
43 /* Not a very swift place to put it, but that's where the BSD port
44 puts them. */
45 #include "/hpux/usr/include/sys/core.h"
46
47 #endif /* HOST_HPPABSD */
48
49 #include <sys/param.h>
50 #ifdef HAVE_DIRENT_H
51 # include <dirent.h>
52 #else
53 # ifdef HAVE_SYS_NDIR_H
54 # include <sys/ndir.h>
55 # endif
56 # ifdef HAVE_SYS_DIR_H
57 # include <sys/dir.h>
58 # endif
59 # ifdef HAVE_NDIR_H
60 # include <ndir.h>
61 # endif
62 #endif
63 #include <signal.h>
64 #include <machine/reg.h>
65 #include <sys/user.h> /* After a.out.h */
66 #include <sys/file.h>
67
68 /* Kludge: There's no explicit mechanism provided by sys/core.h to
69 conditionally know whether a proc_info has thread id fields.
70 However, CORE_ANON_SHMEM shows up first at 10.30, which is
71 happily also when meaningful thread id's show up in proc_info. */
72 #if defined(CORE_ANON_SHMEM)
73 #define PROC_INFO_HAS_THREAD_ID (1)
74 #endif
75
76 /* This type appears at HP-UX 10.30. Defining it if not defined
77 by sys/core.h allows us to build for older HP-UX's, and (since
78 it won't be encountered in core-dumps from older HP-UX's) is
79 harmless. */
80 #if !defined(CORE_ANON_SHMEM)
81 #define CORE_ANON_SHMEM 0x00000200 /* anonymous shared memory */
82 #endif
83
84 /* These are stored in the bfd's tdata */
85
86 /* .lwpid and .user_tid are only valid if PROC_INFO_HAS_THREAD_ID, else they
87 are set to 0. Also, until HP-UX implements MxN threads, .user_tid and
88 .lwpid are synonymous. */
89 struct hpux_core_struct
90 {
91 int sig;
92 int lwpid; /* Kernel thread ID. */
93 unsigned long user_tid; /* User thread ID. */
94 char cmd[MAXCOMLEN + 1];
95 };
96
97 #define core_hdr(bfd) ((bfd)->tdata.hpux_core_data)
98 #define core_signal(bfd) (core_hdr(bfd)->sig)
99 #define core_command(bfd) (core_hdr(bfd)->cmd)
100 #define core_kernel_thread_id(bfd) (core_hdr(bfd)->lwpid)
101 #define core_user_thread_id(bfd) (core_hdr(bfd)->user_tid)
102
103 static asection *make_bfd_asection
104 PARAMS ((bfd *, const char *, flagword, bfd_size_type, bfd_vma,
105 unsigned int));
106 static const bfd_target *hpux_core_core_file_p
107 PARAMS ((bfd *));
108 static char *hpux_core_core_file_failing_command
109 PARAMS ((bfd *));
110 static int hpux_core_core_file_failing_signal
111 PARAMS ((bfd *));
112 static bfd_boolean hpux_core_core_file_matches_executable_p
113 PARAMS ((bfd *, bfd *));
114 static void swap_abort
115 PARAMS ((void));
116
117 static asection *
make_bfd_asection(abfd,name,flags,size,vma,alignment_power)118 make_bfd_asection (abfd, name, flags, size, vma, alignment_power)
119 bfd *abfd;
120 const char *name;
121 flagword flags;
122 bfd_size_type size;
123 bfd_vma vma;
124 unsigned int alignment_power;
125 {
126 asection *asect;
127 char *newname;
128
129 newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1);
130 if (!newname)
131 return NULL;
132
133 strcpy (newname, name);
134
135 asect = bfd_make_section_anyway (abfd, newname);
136 if (!asect)
137 return NULL;
138
139 asect->flags = flags;
140 asect->size = size;
141 asect->vma = vma;
142 asect->filepos = bfd_tell (abfd);
143 asect->alignment_power = alignment_power;
144
145 return asect;
146 }
147
148 /* Return true if the given core file section corresponds to a thread,
149 based on its name. */
150
151 static int
thread_section_p(bfd * abfd ATTRIBUTE_UNUSED,asection * sect,void * obj ATTRIBUTE_UNUSED)152 thread_section_p (bfd *abfd ATTRIBUTE_UNUSED,
153 asection *sect,
154 void *obj ATTRIBUTE_UNUSED)
155 {
156 return (strncmp (bfd_section_name (abfd, sect), ".reg/", 5) == 0);
157 }
158
159 /* this function builds a bfd target if the file is a corefile.
160 It returns null or 0 if it finds out thaat it is not a core file.
161 The way it checks this is by looking for allowed 'type' field values.
162 These are declared in sys/core.h
163 There are some values which are 'reserved for future use'. In particular
164 CORE_NONE is actually defined as 0. This may be a catch-all for cases
165 in which the core file is generated by some non-hpux application.
166 (I am just guessing here!)
167 */
168 static const bfd_target *
hpux_core_core_file_p(abfd)169 hpux_core_core_file_p (abfd)
170 bfd *abfd;
171 {
172 int good_sections = 0;
173 int unknown_sections = 0;
174
175 core_hdr (abfd) = (struct hpux_core_struct *)
176 bfd_zalloc (abfd, (bfd_size_type) sizeof (struct hpux_core_struct));
177 if (!core_hdr (abfd))
178 return NULL;
179
180 while (1)
181 {
182 int val;
183 struct corehead core_header;
184
185 val = bfd_bread ((void *) &core_header,
186 (bfd_size_type) sizeof core_header, abfd);
187 if (val <= 0)
188 break;
189 switch (core_header.type)
190 {
191 case CORE_KERNEL:
192 case CORE_FORMAT:
193 /* Just skip this. */
194 bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
195 good_sections++;
196 break;
197 case CORE_EXEC:
198 {
199 struct proc_exec proc_exec;
200 if (bfd_bread ((void *) &proc_exec, (bfd_size_type) core_header.len,
201 abfd) != core_header.len)
202 break;
203 strncpy (core_command (abfd), proc_exec.cmd, MAXCOMLEN + 1);
204 good_sections++;
205 }
206 break;
207 case CORE_PROC:
208 {
209 struct proc_info proc_info;
210 char secname[100]; /* Of arbitrary size, but plenty large. */
211
212 /* We need to read this section, 'cause we need to determine
213 whether the core-dumped app was threaded before we create
214 any .reg sections. */
215 if (bfd_bread (&proc_info, (bfd_size_type) core_header.len, abfd)
216 != core_header.len)
217 break;
218
219 /* However, we also want to create those sections with the
220 file positioned at the start of the record, it seems. */
221 if (bfd_seek (abfd, -((file_ptr) core_header.len), SEEK_CUR) != 0)
222 break;
223
224 #if defined(PROC_INFO_HAS_THREAD_ID)
225 core_kernel_thread_id (abfd) = proc_info.lwpid;
226 core_user_thread_id (abfd) = proc_info.user_tid;
227 #else
228 core_kernel_thread_id (abfd) = 0;
229 core_user_thread_id (abfd) = 0;
230 #endif
231 /* If the program was unthreaded, then we'll just create a
232 .reg section.
233
234 If the program was threaded, then we'll create .reg/XXXXX
235 section for each thread, where XXXXX is a printable
236 representation of the kernel thread id. We'll also
237 create a .reg section for the thread that was running
238 and signalled at the time of the core-dump (i.e., this
239 is effectively an alias, needed to keep GDB happy.)
240
241 Note that we use `.reg/XXXXX' as opposed to '.regXXXXX'
242 because GDB expects that .reg2 will be the floating-
243 point registers. */
244 if (core_kernel_thread_id (abfd) == 0)
245 {
246 if (!make_bfd_asection (abfd, ".reg",
247 SEC_HAS_CONTENTS,
248 core_header.len,
249 (bfd_vma) offsetof (struct proc_info,
250 hw_regs),
251 2))
252 goto fail;
253 }
254 else
255 {
256 /* There are threads. Is this the one that caused the
257 core-dump? We'll claim it was the running thread. */
258 if (proc_info.sig != -1)
259 {
260 if (!make_bfd_asection (abfd, ".reg",
261 SEC_HAS_CONTENTS,
262 core_header.len,
263 (bfd_vma)offsetof (struct proc_info,
264 hw_regs),
265 2))
266 goto fail;
267 }
268 /* We always make one of these sections, for every thread. */
269 sprintf (secname, ".reg/%d", core_kernel_thread_id (abfd));
270 if (!make_bfd_asection (abfd, secname,
271 SEC_HAS_CONTENTS,
272 core_header.len,
273 (bfd_vma) offsetof (struct proc_info,
274 hw_regs),
275 2))
276 goto fail;
277 }
278 core_signal (abfd) = proc_info.sig;
279 if (bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR) != 0)
280 break;
281 good_sections++;
282 }
283 break;
284
285 case CORE_DATA:
286 case CORE_STACK:
287 case CORE_TEXT:
288 case CORE_MMF:
289 case CORE_SHM:
290 case CORE_ANON_SHMEM:
291 if (!make_bfd_asection (abfd, ".data",
292 SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
293 core_header.len,
294 (bfd_vma) core_header.addr, 2))
295 goto fail;
296
297 bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
298 good_sections++;
299 break;
300
301 case CORE_NONE:
302 /* Let's not punt if we encounter a section of unknown
303 type. Rather, let's make a note of it. If we later
304 see that there were also "good" sections, then we'll
305 declare that this a core file, but we'll also warn that
306 it may be incompatible with this gdb.
307 */
308 unknown_sections++;
309 break;
310
311 default:
312 goto fail; /*unrecognized core file type */
313 }
314 }
315
316 /* OK, we believe you. You're a core file (sure, sure). */
317
318 /* On HP/UX, we sometimes encounter core files where none of the threads
319 was found to be the running thread (ie the signal was set to -1 for
320 all threads). This happens when the program was aborted externally
321 via a TT_CORE ttrace system call. In that case, we just pick one
322 thread at random to be the active thread. */
323 if (core_kernel_thread_id (abfd) != 0
324 && bfd_get_section_by_name (abfd, ".reg") == NULL)
325 {
326 asection *asect = bfd_sections_find_if (abfd, thread_section_p, NULL);
327 asection *reg_sect;
328
329 if (asect != NULL)
330 {
331 reg_sect = make_bfd_asection (abfd, ".reg", asect->flags,
332 asect->size, asect->vma,
333 asect->alignment_power);
334 if (reg_sect == NULL)
335 goto fail;
336
337 reg_sect->filepos = asect->filepos;
338 }
339 }
340
341 /* Were there sections of unknown type? If so, yet there were
342 at least some complete sections of known type, then, issue
343 a warning. Possibly the core file was generated on a version
344 of HP-UX that is incompatible with that for which this gdb was
345 built.
346 */
347 if ((unknown_sections > 0) && (good_sections > 0))
348 (*_bfd_error_handler)
349 ("%s appears to be a core file,\nbut contains unknown sections. It may have been created on an incompatible\nversion of HP-UX. As a result, some information may be unavailable.\n",
350 abfd->filename);
351
352 return abfd->xvec;
353
354 fail:
355 bfd_release (abfd, core_hdr (abfd));
356 core_hdr (abfd) = NULL;
357 bfd_section_list_clear (abfd);
358 return NULL;
359 }
360
361 static char *
hpux_core_core_file_failing_command(abfd)362 hpux_core_core_file_failing_command (abfd)
363 bfd *abfd;
364 {
365 return core_command (abfd);
366 }
367
368 static int
hpux_core_core_file_failing_signal(abfd)369 hpux_core_core_file_failing_signal (abfd)
370 bfd *abfd;
371 {
372 return core_signal (abfd);
373 }
374
375 static bfd_boolean
hpux_core_core_file_matches_executable_p(core_bfd,exec_bfd)376 hpux_core_core_file_matches_executable_p (core_bfd, exec_bfd)
377 bfd *core_bfd ATTRIBUTE_UNUSED;
378 bfd *exec_bfd ATTRIBUTE_UNUSED;
379 {
380 return TRUE; /* FIXME, We have no way of telling at this point */
381 }
382
383 /* If somebody calls any byte-swapping routines, shoot them. */
384 static void
swap_abort()385 swap_abort ()
386 {
387 abort(); /* This way doesn't require any declaration for ANSI to fuck up */
388 }
389
390 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
391 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
392 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
393 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
394 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
395 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
396
397 const bfd_target hpux_core_vec =
398 {
399 "hpux-core",
400 bfd_target_unknown_flavour,
401 BFD_ENDIAN_BIG, /* target byte order */
402 BFD_ENDIAN_BIG, /* target headers byte order */
403 (HAS_RELOC | EXEC_P | /* object flags */
404 HAS_LINENO | HAS_DEBUG |
405 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
406 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
407 0, /* symbol prefix */
408 ' ', /* ar_pad_char */
409 16, /* ar_max_namelen */
410 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */
411 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */
412 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */
413 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */
414 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */
415 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */
416
417 { /* bfd_check_format */
418 _bfd_dummy_target, /* unknown format */
419 _bfd_dummy_target, /* object file */
420 _bfd_dummy_target, /* archive */
421 hpux_core_core_file_p /* a core file */
422 },
423 { /* bfd_set_format */
424 bfd_false, bfd_false,
425 bfd_false, bfd_false
426 },
427 { /* bfd_write_contents */
428 bfd_false, bfd_false,
429 bfd_false, bfd_false
430 },
431
432 BFD_JUMP_TABLE_GENERIC (_bfd_generic),
433 BFD_JUMP_TABLE_COPY (_bfd_generic),
434 BFD_JUMP_TABLE_CORE (hpux_core),
435 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
436 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
437 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
438 BFD_JUMP_TABLE_WRITE (_bfd_generic),
439 BFD_JUMP_TABLE_LINK (_bfd_nolink),
440 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
441
442 NULL,
443
444 (PTR) 0 /* backend_data */
445 };
446