1 /* BFD back-end for HP/UX core files.
2 Copyright 1993, 1994, 1996, 1998, 1999, 2001, 2002, 2003, 2004, 2005, 2006,
3 2007, 2008, 2010, 2011, 2012 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 3 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,
22 MA 02110-1301, USA. */
23
24
25 /* This file can only be compiled on systems which use HP/UX style
26 core files. */
27
28 #include "sysdep.h"
29 #include "bfd.h"
30 #include "libbfd.h"
31
32 #if defined (HOST_HPPAHPUX) || defined (HOST_HP300HPUX) || defined (HOST_HPPAMPEIX)
33
34 /* FIXME: sys/core.h doesn't exist for HPUX version 7. HPUX version
35 5, 6, and 7 core files seem to be standard trad-core.c type core
36 files; can we just use trad-core.c in addition to this file? */
37
38 #include <sys/core.h>
39 #include <sys/utsname.h>
40
41 #endif /* HOST_HPPAHPUX */
42
43 #ifdef HOST_HPPABSD
44
45 /* Not a very swift place to put it, but that's where the BSD port
46 puts them. */
47 #include "/hpux/usr/include/sys/core.h"
48
49 #endif /* HOST_HPPABSD */
50
51 #include <sys/param.h>
52 #ifdef HAVE_DIRENT_H
53 # include <dirent.h>
54 #else
55 # ifdef HAVE_SYS_NDIR_H
56 # include <sys/ndir.h>
57 # endif
58 # ifdef HAVE_SYS_DIR_H
59 # include <sys/dir.h>
60 # endif
61 # ifdef HAVE_NDIR_H
62 # include <ndir.h>
63 # endif
64 #endif
65 #include <signal.h>
66 #ifdef HPUX_CORE
67 #include <machine/reg.h>
68 #endif
69 #include <sys/file.h>
70
71 /* Kludge: There's no explicit mechanism provided by sys/core.h to
72 conditionally know whether a proc_info has thread id fields.
73 However, CORE_ANON_SHMEM shows up first at 10.30, which is
74 happily also when meaningful thread id's show up in proc_info. */
75 #if defined(CORE_ANON_SHMEM)
76 #define PROC_INFO_HAS_THREAD_ID (1)
77 #endif
78
79 /* This type appears at HP-UX 10.30. Defining it if not defined
80 by sys/core.h allows us to build for older HP-UX's, and (since
81 it won't be encountered in core-dumps from older HP-UX's) is
82 harmless. */
83 #if !defined(CORE_ANON_SHMEM)
84 #define CORE_ANON_SHMEM 0x00000200 /* anonymous shared memory */
85 #endif
86
87 /* These are stored in the bfd's tdata */
88
89 /* .lwpid and .user_tid are only valid if PROC_INFO_HAS_THREAD_ID, else they
90 are set to 0. Also, until HP-UX implements MxN threads, .user_tid and
91 .lwpid are synonymous. */
92 struct hpux_core_struct
93 {
94 int sig;
95 int lwpid; /* Kernel thread ID. */
96 unsigned long user_tid; /* User thread ID. */
97 char cmd[MAXCOMLEN + 1];
98 };
99
100 #define core_hdr(bfd) ((bfd)->tdata.hpux_core_data)
101 #define core_signal(bfd) (core_hdr(bfd)->sig)
102 #define core_command(bfd) (core_hdr(bfd)->cmd)
103 #define core_kernel_thread_id(bfd) (core_hdr(bfd)->lwpid)
104 #define core_user_thread_id(bfd) (core_hdr(bfd)->user_tid)
105 #define hpux_core_core_file_matches_executable_p generic_core_file_matches_executable_p
106 #define hpux_core_core_file_pid _bfd_nocore_core_file_pid
107
108 static asection *make_bfd_asection (bfd *, const char *, flagword,
109 bfd_size_type, bfd_vma, unsigned int);
110 static const bfd_target *hpux_core_core_file_p (bfd *);
111 static char *hpux_core_core_file_failing_command (bfd *);
112 static int hpux_core_core_file_failing_signal (bfd *);
113 static void swap_abort (void);
114
115 static asection *
make_bfd_asection(bfd * abfd,const char * name,flagword flags,bfd_size_type size,bfd_vma vma,unsigned int alignment_power)116 make_bfd_asection (bfd *abfd, const char *name, flagword flags,
117 bfd_size_type size, bfd_vma vma,
118 unsigned int alignment_power)
119 {
120 asection *asect;
121 char *newname;
122
123 newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1);
124 if (!newname)
125 return NULL;
126
127 strcpy (newname, name);
128
129 asect = bfd_make_section_anyway_with_flags (abfd, newname, flags);
130 if (!asect)
131 return NULL;
132
133 asect->size = size;
134 asect->vma = vma;
135 asect->filepos = bfd_tell (abfd);
136 asect->alignment_power = alignment_power;
137
138 return asect;
139 }
140
141 /* Return true if the given core file section corresponds to a thread,
142 based on its name. */
143
144 static int
thread_section_p(bfd * abfd ATTRIBUTE_UNUSED,asection * sect,void * obj ATTRIBUTE_UNUSED)145 thread_section_p (bfd *abfd ATTRIBUTE_UNUSED,
146 asection *sect,
147 void *obj ATTRIBUTE_UNUSED)
148 {
149 return CONST_STRNEQ (sect->name, ".reg/");
150 }
151
152 /* this function builds a bfd target if the file is a corefile.
153 It returns null or 0 if it finds out thaat it is not a core file.
154 The way it checks this is by looking for allowed 'type' field values.
155 These are declared in sys/core.h
156 There are some values which are 'reserved for future use'. In particular
157 CORE_NONE is actually defined as 0. This may be a catch-all for cases
158 in which the core file is generated by some non-hpux application.
159 (I am just guessing here!)
160 */
161 static const bfd_target *
hpux_core_core_file_p(bfd * abfd)162 hpux_core_core_file_p (bfd *abfd)
163 {
164 int good_sections = 0;
165 int unknown_sections = 0;
166
167 core_hdr (abfd) = (struct hpux_core_struct *)
168 bfd_zalloc (abfd, (bfd_size_type) sizeof (struct hpux_core_struct));
169 if (!core_hdr (abfd))
170 return NULL;
171
172 while (1)
173 {
174 int val;
175 struct corehead core_header;
176
177 val = bfd_bread ((void *) &core_header,
178 (bfd_size_type) sizeof core_header, abfd);
179 if (val <= 0)
180 break;
181 switch (core_header.type)
182 {
183 case CORE_KERNEL:
184 case CORE_FORMAT:
185 /* Just skip this. */
186 bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
187 good_sections++;
188 break;
189 case CORE_EXEC:
190 {
191 struct proc_exec proc_exec;
192 if (bfd_bread ((void *) &proc_exec, (bfd_size_type) core_header.len,
193 abfd) != core_header.len)
194 break;
195 strncpy (core_command (abfd), proc_exec.cmd, MAXCOMLEN + 1);
196 good_sections++;
197 }
198 break;
199 case CORE_PROC:
200 {
201 struct proc_info proc_info;
202 char secname[100]; /* Of arbitrary size, but plenty large. */
203
204 /* We need to read this section, 'cause we need to determine
205 whether the core-dumped app was threaded before we create
206 any .reg sections. */
207 if (bfd_bread (&proc_info, (bfd_size_type) core_header.len, abfd)
208 != core_header.len)
209 break;
210
211 /* However, we also want to create those sections with the
212 file positioned at the start of the record, it seems. */
213 if (bfd_seek (abfd, -((file_ptr) core_header.len), SEEK_CUR) != 0)
214 break;
215
216 #if defined(PROC_INFO_HAS_THREAD_ID)
217 core_kernel_thread_id (abfd) = proc_info.lwpid;
218 core_user_thread_id (abfd) = proc_info.user_tid;
219 #else
220 core_kernel_thread_id (abfd) = 0;
221 core_user_thread_id (abfd) = 0;
222 #endif
223 /* If the program was unthreaded, then we'll just create a
224 .reg section.
225
226 If the program was threaded, then we'll create .reg/XXXXX
227 section for each thread, where XXXXX is a printable
228 representation of the kernel thread id. We'll also
229 create a .reg section for the thread that was running
230 and signalled at the time of the core-dump (i.e., this
231 is effectively an alias, needed to keep GDB happy.)
232
233 Note that we use `.reg/XXXXX' as opposed to '.regXXXXX'
234 because GDB expects that .reg2 will be the floating-
235 point registers. */
236 if (core_kernel_thread_id (abfd) == 0)
237 {
238 if (!make_bfd_asection (abfd, ".reg",
239 SEC_HAS_CONTENTS,
240 core_header.len,
241 (bfd_vma) offsetof (struct proc_info,
242 hw_regs),
243 2))
244 goto fail;
245 }
246 else
247 {
248 /* There are threads. Is this the one that caused the
249 core-dump? We'll claim it was the running thread. */
250 if (proc_info.sig != -1)
251 {
252 if (!make_bfd_asection (abfd, ".reg",
253 SEC_HAS_CONTENTS,
254 core_header.len,
255 (bfd_vma)offsetof (struct proc_info,
256 hw_regs),
257 2))
258 goto fail;
259 }
260 /* We always make one of these sections, for every thread. */
261 sprintf (secname, ".reg/%d", core_kernel_thread_id (abfd));
262 if (!make_bfd_asection (abfd, secname,
263 SEC_HAS_CONTENTS,
264 core_header.len,
265 (bfd_vma) offsetof (struct proc_info,
266 hw_regs),
267 2))
268 goto fail;
269 }
270 core_signal (abfd) = proc_info.sig;
271 if (bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR) != 0)
272 break;
273 good_sections++;
274 }
275 break;
276
277 case CORE_DATA:
278 case CORE_STACK:
279 case CORE_TEXT:
280 case CORE_MMF:
281 case CORE_SHM:
282 case CORE_ANON_SHMEM:
283 if (!make_bfd_asection (abfd, ".data",
284 SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
285 core_header.len,
286 (bfd_vma) core_header.addr, 2))
287 goto fail;
288
289 bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
290 good_sections++;
291 break;
292
293 case CORE_NONE:
294 /* Let's not punt if we encounter a section of unknown
295 type. Rather, let's make a note of it. If we later
296 see that there were also "good" sections, then we'll
297 declare that this a core file, but we'll also warn that
298 it may be incompatible with this gdb.
299 */
300 unknown_sections++;
301 break;
302
303 default:
304 goto fail; /*unrecognized core file type */
305 }
306 }
307
308 /* OK, we believe you. You're a core file (sure, sure). */
309
310 /* On HP/UX, we sometimes encounter core files where none of the threads
311 was found to be the running thread (ie the signal was set to -1 for
312 all threads). This happens when the program was aborted externally
313 via a TT_CORE ttrace system call. In that case, we just pick one
314 thread at random to be the active thread. */
315 if (core_kernel_thread_id (abfd) != 0
316 && bfd_get_section_by_name (abfd, ".reg") == NULL)
317 {
318 asection *asect = bfd_sections_find_if (abfd, thread_section_p, NULL);
319 asection *reg_sect;
320
321 if (asect != NULL)
322 {
323 reg_sect = make_bfd_asection (abfd, ".reg", asect->flags,
324 asect->size, asect->vma,
325 asect->alignment_power);
326 if (reg_sect == NULL)
327 goto fail;
328
329 reg_sect->filepos = asect->filepos;
330 }
331 }
332
333 /* Were there sections of unknown type? If so, yet there were
334 at least some complete sections of known type, then, issue
335 a warning. Possibly the core file was generated on a version
336 of HP-UX that is incompatible with that for which this gdb was
337 built.
338 */
339 if ((unknown_sections > 0) && (good_sections > 0))
340 (*_bfd_error_handler)
341 ("%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",
342 abfd->filename);
343
344 return abfd->xvec;
345
346 fail:
347 bfd_release (abfd, core_hdr (abfd));
348 core_hdr (abfd) = NULL;
349 bfd_section_list_clear (abfd);
350 return NULL;
351 }
352
353 static char *
hpux_core_core_file_failing_command(bfd * abfd)354 hpux_core_core_file_failing_command (bfd *abfd)
355 {
356 return core_command (abfd);
357 }
358
359 static int
hpux_core_core_file_failing_signal(bfd * abfd)360 hpux_core_core_file_failing_signal (bfd *abfd)
361 {
362 return core_signal (abfd);
363 }
364
365
366 /* If somebody calls any byte-swapping routines, shoot them. */
367 static void
swap_abort(void)368 swap_abort (void)
369 {
370 abort(); /* This way doesn't require any declaration for ANSI to fuck up */
371 }
372
373 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
374 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
375 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
376 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
377 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
378 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
379
380 const bfd_target hpux_core_vec =
381 {
382 "hpux-core",
383 bfd_target_unknown_flavour,
384 BFD_ENDIAN_BIG, /* target byte order */
385 BFD_ENDIAN_BIG, /* target headers byte order */
386 (HAS_RELOC | EXEC_P | /* object flags */
387 HAS_LINENO | HAS_DEBUG |
388 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
389 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
390 0, /* symbol prefix */
391 ' ', /* ar_pad_char */
392 16, /* ar_max_namelen */
393 0, /* match priority. */
394 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */
395 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */
396 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */
397 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */
398 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */
399 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */
400
401 { /* bfd_check_format */
402 _bfd_dummy_target, /* unknown format */
403 _bfd_dummy_target, /* object file */
404 _bfd_dummy_target, /* archive */
405 hpux_core_core_file_p /* a core file */
406 },
407 { /* bfd_set_format */
408 bfd_false, bfd_false,
409 bfd_false, bfd_false
410 },
411 { /* bfd_write_contents */
412 bfd_false, bfd_false,
413 bfd_false, bfd_false
414 },
415
416 BFD_JUMP_TABLE_GENERIC (_bfd_generic),
417 BFD_JUMP_TABLE_COPY (_bfd_generic),
418 BFD_JUMP_TABLE_CORE (hpux_core),
419 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
420 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
421 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
422 BFD_JUMP_TABLE_WRITE (_bfd_generic),
423 BFD_JUMP_TABLE_LINK (_bfd_nolink),
424 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
425
426 NULL,
427
428 NULL /* backend_data */
429 };
430