1 /* BFD back-end for HP/UX core files.
2 Copyright (C) 1993-2016 Free Software Foundation, Inc.
3 Written by Stu Grossman, Cygnus Support.
4 Converted to back-end form by Ian Lance Taylor, Cygnus SUpport
5
6 This file is part of BFD, the Binary File Descriptor library.
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
21 MA 02110-1301, USA. */
22
23
24 /* This file can only be compiled on systems which use HP/UX style
25 core files. */
26
27 #include "sysdep.h"
28 #include "bfd.h"
29 #include "libbfd.h"
30
31 #if defined (HOST_HPPAHPUX) || defined (HOST_HP300HPUX) || defined (HOST_HPPAMPEIX)
32
33 /* FIXME: sys/core.h doesn't exist for HPUX version 7. HPUX version
34 5, 6, and 7 core files seem to be standard trad-core.c type core
35 files; can we just use trad-core.c in addition to this file? */
36
37 #include <sys/core.h>
38 #include <sys/utsname.h>
39
40 #endif /* HOST_HPPAHPUX */
41
42 #ifdef HOST_HPPABSD
43
44 /* Not a very swift place to put it, but that's where the BSD port
45 puts them. */
46 #include "/hpux/usr/include/sys/core.h"
47
48 #endif /* HOST_HPPABSD */
49
50 #include <sys/param.h>
51 #ifdef HAVE_DIRENT_H
52 # include <dirent.h>
53 #else
54 # ifdef HAVE_SYS_NDIR_H
55 # include <sys/ndir.h>
56 # endif
57 # ifdef HAVE_SYS_DIR_H
58 # include <sys/dir.h>
59 # endif
60 # ifdef HAVE_NDIR_H
61 # include <ndir.h>
62 # endif
63 #endif
64 #include <signal.h>
65 #ifdef HPUX_CORE
66 #include <machine/reg.h>
67 #endif
68 #include <sys/file.h>
69
70 /* Kludge: There's no explicit mechanism provided by sys/core.h to
71 conditionally know whether a proc_info has thread id fields.
72 However, CORE_ANON_SHMEM shows up first at 10.30, which is
73 happily also when meaningful thread id's show up in proc_info. */
74 #if defined(CORE_ANON_SHMEM)
75 #define PROC_INFO_HAS_THREAD_ID (1)
76 #endif
77
78 /* This type appears at HP-UX 10.30. Defining it if not defined
79 by sys/core.h allows us to build for older HP-UX's, and (since
80 it won't be encountered in core-dumps from older HP-UX's) is
81 harmless. */
82 #if !defined(CORE_ANON_SHMEM)
83 #define CORE_ANON_SHMEM 0x00000200 /* anonymous shared memory */
84 #endif
85
86 /* These are stored in the bfd's tdata */
87
88 /* .lwpid and .user_tid are only valid if PROC_INFO_HAS_THREAD_ID, else they
89 are set to 0. Also, until HP-UX implements MxN threads, .user_tid and
90 .lwpid are synonymous. */
91 struct hpux_core_struct
92 {
93 int sig;
94 int lwpid; /* Kernel thread ID. */
95 unsigned long user_tid; /* User thread ID. */
96 char cmd[MAXCOMLEN + 1];
97 };
98
99 #define core_hdr(bfd) ((bfd)->tdata.hpux_core_data)
100 #define core_signal(bfd) (core_hdr(bfd)->sig)
101 #define core_command(bfd) (core_hdr(bfd)->cmd)
102 #define core_kernel_thread_id(bfd) (core_hdr(bfd)->lwpid)
103 #define core_user_thread_id(bfd) (core_hdr(bfd)->user_tid)
104 #define hpux_core_core_file_matches_executable_p generic_core_file_matches_executable_p
105 #define hpux_core_core_file_pid _bfd_nocore_core_file_pid
106
107 static asection *make_bfd_asection (bfd *, const char *, flagword,
108 bfd_size_type, bfd_vma, unsigned int);
109 static const bfd_target *hpux_core_core_file_p (bfd *);
110 static char *hpux_core_core_file_failing_command (bfd *);
111 static int hpux_core_core_file_failing_signal (bfd *);
112 static void swap_abort (void);
113
114 static asection *
make_bfd_asection(bfd * abfd,const char * name,flagword flags,bfd_size_type size,bfd_vma vma,unsigned int alignment_power)115 make_bfd_asection (bfd *abfd, const char *name, flagword flags,
116 bfd_size_type size, bfd_vma vma,
117 unsigned int alignment_power)
118 {
119 asection *asect;
120 char *newname;
121
122 newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1);
123 if (!newname)
124 return NULL;
125
126 strcpy (newname, name);
127
128 asect = bfd_make_section_anyway_with_flags (abfd, newname, flags);
129 if (!asect)
130 return NULL;
131
132 asect->size = size;
133 asect->vma = vma;
134 asect->filepos = bfd_tell (abfd);
135 asect->alignment_power = alignment_power;
136
137 return asect;
138 }
139
140 /* Return true if the given core file section corresponds to a thread,
141 based on its name. */
142
143 static int
thread_section_p(bfd * abfd ATTRIBUTE_UNUSED,asection * sect,void * obj ATTRIBUTE_UNUSED)144 thread_section_p (bfd *abfd ATTRIBUTE_UNUSED,
145 asection *sect,
146 void *obj ATTRIBUTE_UNUSED)
147 {
148 return CONST_STRNEQ (sect->name, ".reg/");
149 }
150
151 /* this function builds a bfd target if the file is a corefile.
152 It returns null or 0 if it finds out thaat it is not a core file.
153 The way it checks this is by looking for allowed 'type' field values.
154 These are declared in sys/core.h
155 There are some values which are 'reserved for future use'. In particular
156 CORE_NONE is actually defined as 0. This may be a catch-all for cases
157 in which the core file is generated by some non-hpux application.
158 (I am just guessing here!)
159 */
160 static const bfd_target *
hpux_core_core_file_p(bfd * abfd)161 hpux_core_core_file_p (bfd *abfd)
162 {
163 int good_sections = 0;
164 int unknown_sections = 0;
165
166 core_hdr (abfd) = (struct hpux_core_struct *)
167 bfd_zalloc (abfd, (bfd_size_type) sizeof (struct hpux_core_struct));
168 if (!core_hdr (abfd))
169 return NULL;
170
171 while (1)
172 {
173 int val;
174 struct corehead core_header;
175
176 val = bfd_bread ((void *) &core_header,
177 (bfd_size_type) sizeof core_header, abfd);
178 if (val <= 0)
179 break;
180 switch (core_header.type)
181 {
182 case CORE_KERNEL:
183 case CORE_FORMAT:
184 /* Just skip this. */
185 bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
186 good_sections++;
187 break;
188 case CORE_EXEC:
189 {
190 struct proc_exec proc_exec;
191 if (bfd_bread ((void *) &proc_exec, (bfd_size_type) core_header.len,
192 abfd) != core_header.len)
193 break;
194 strncpy (core_command (abfd), proc_exec.cmd, MAXCOMLEN + 1);
195 good_sections++;
196 }
197 break;
198 case CORE_PROC:
199 {
200 struct proc_info proc_info;
201 char secname[100]; /* Of arbitrary size, but plenty large. */
202
203 /* We need to read this section, 'cause we need to determine
204 whether the core-dumped app was threaded before we create
205 any .reg sections. */
206 if (bfd_bread (&proc_info, (bfd_size_type) core_header.len, abfd)
207 != core_header.len)
208 break;
209
210 /* However, we also want to create those sections with the
211 file positioned at the start of the record, it seems. */
212 if (bfd_seek (abfd, -((file_ptr) core_header.len), SEEK_CUR) != 0)
213 break;
214
215 #if defined(PROC_INFO_HAS_THREAD_ID)
216 core_kernel_thread_id (abfd) = proc_info.lwpid;
217 core_user_thread_id (abfd) = proc_info.user_tid;
218 #else
219 core_kernel_thread_id (abfd) = 0;
220 core_user_thread_id (abfd) = 0;
221 #endif
222 /* If the program was unthreaded, then we'll just create a
223 .reg section.
224
225 If the program was threaded, then we'll create .reg/XXXXX
226 section for each thread, where XXXXX is a printable
227 representation of the kernel thread id. We'll also
228 create a .reg section for the thread that was running
229 and signalled at the time of the core-dump (i.e., this
230 is effectively an alias, needed to keep GDB happy.)
231
232 Note that we use `.reg/XXXXX' as opposed to '.regXXXXX'
233 because GDB expects that .reg2 will be the floating-
234 point registers. */
235 if (core_kernel_thread_id (abfd) == 0)
236 {
237 if (!make_bfd_asection (abfd, ".reg",
238 SEC_HAS_CONTENTS,
239 core_header.len,
240 (bfd_vma) offsetof (struct proc_info,
241 hw_regs),
242 2))
243 goto fail;
244 }
245 else
246 {
247 /* There are threads. Is this the one that caused the
248 core-dump? We'll claim it was the running thread. */
249 if (proc_info.sig != -1)
250 {
251 if (!make_bfd_asection (abfd, ".reg",
252 SEC_HAS_CONTENTS,
253 core_header.len,
254 (bfd_vma)offsetof (struct proc_info,
255 hw_regs),
256 2))
257 goto fail;
258 }
259 /* We always make one of these sections, for every thread. */
260 sprintf (secname, ".reg/%d", core_kernel_thread_id (abfd));
261 if (!make_bfd_asection (abfd, secname,
262 SEC_HAS_CONTENTS,
263 core_header.len,
264 (bfd_vma) offsetof (struct proc_info,
265 hw_regs),
266 2))
267 goto fail;
268 }
269 core_signal (abfd) = proc_info.sig;
270 if (bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR) != 0)
271 break;
272 good_sections++;
273 }
274 break;
275
276 case CORE_DATA:
277 case CORE_STACK:
278 case CORE_TEXT:
279 case CORE_MMF:
280 case CORE_SHM:
281 case CORE_ANON_SHMEM:
282 if (!make_bfd_asection (abfd, ".data",
283 SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
284 core_header.len,
285 (bfd_vma) core_header.addr, 2))
286 goto fail;
287
288 bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
289 good_sections++;
290 break;
291
292 case CORE_NONE:
293 /* Let's not punt if we encounter a section of unknown
294 type. Rather, let's make a note of it. If we later
295 see that there were also "good" sections, then we'll
296 declare that this a core file, but we'll also warn that
297 it may be incompatible with this gdb.
298 */
299 unknown_sections++;
300 break;
301
302 default:
303 goto fail; /*unrecognized core file type */
304 }
305 }
306
307 /* OK, we believe you. You're a core file (sure, sure). */
308
309 /* On HP/UX, we sometimes encounter core files where none of the threads
310 was found to be the running thread (ie the signal was set to -1 for
311 all threads). This happens when the program was aborted externally
312 via a TT_CORE ttrace system call. In that case, we just pick one
313 thread at random to be the active thread. */
314 if (core_kernel_thread_id (abfd) != 0
315 && bfd_get_section_by_name (abfd, ".reg") == NULL)
316 {
317 asection *asect = bfd_sections_find_if (abfd, thread_section_p, NULL);
318 asection *reg_sect;
319
320 if (asect != NULL)
321 {
322 reg_sect = make_bfd_asection (abfd, ".reg", asect->flags,
323 asect->size, asect->vma,
324 asect->alignment_power);
325 if (reg_sect == NULL)
326 goto fail;
327
328 reg_sect->filepos = asect->filepos;
329 }
330 }
331
332 /* Were there sections of unknown type? If so, yet there were
333 at least some complete sections of known type, then, issue
334 a warning. Possibly the core file was generated on a version
335 of HP-UX that is incompatible with that for which this gdb was
336 built.
337 */
338 if ((unknown_sections > 0) && (good_sections > 0))
339 (*_bfd_error_handler)
340 ("%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",
341 abfd->filename);
342
343 return abfd->xvec;
344
345 fail:
346 bfd_release (abfd, core_hdr (abfd));
347 core_hdr (abfd) = NULL;
348 bfd_section_list_clear (abfd);
349 return NULL;
350 }
351
352 static char *
hpux_core_core_file_failing_command(bfd * abfd)353 hpux_core_core_file_failing_command (bfd *abfd)
354 {
355 return core_command (abfd);
356 }
357
358 static int
hpux_core_core_file_failing_signal(bfd * abfd)359 hpux_core_core_file_failing_signal (bfd *abfd)
360 {
361 return core_signal (abfd);
362 }
363
364
365 /* If somebody calls any byte-swapping routines, shoot them. */
366 static void
swap_abort(void)367 swap_abort (void)
368 {
369 abort(); /* This way doesn't require any declaration for ANSI to fuck up */
370 }
371
372 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
373 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
374 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
375 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
376 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
377 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
378
379 const bfd_target core_hpux_vec =
380 {
381 "hpux-core",
382 bfd_target_unknown_flavour,
383 BFD_ENDIAN_BIG, /* target byte order */
384 BFD_ENDIAN_BIG, /* target headers byte order */
385 (HAS_RELOC | EXEC_P | /* object flags */
386 HAS_LINENO | HAS_DEBUG |
387 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
388 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
389 0, /* symbol prefix */
390 ' ', /* ar_pad_char */
391 16, /* ar_max_namelen */
392 0, /* match priority. */
393 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */
394 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */
395 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */
396 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */
397 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */
398 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */
399
400 { /* bfd_check_format */
401 _bfd_dummy_target, /* unknown format */
402 _bfd_dummy_target, /* object file */
403 _bfd_dummy_target, /* archive */
404 hpux_core_core_file_p /* a core file */
405 },
406 { /* bfd_set_format */
407 bfd_false, bfd_false,
408 bfd_false, bfd_false
409 },
410 { /* bfd_write_contents */
411 bfd_false, bfd_false,
412 bfd_false, bfd_false
413 },
414
415 BFD_JUMP_TABLE_GENERIC (_bfd_generic),
416 BFD_JUMP_TABLE_COPY (_bfd_generic),
417 BFD_JUMP_TABLE_CORE (hpux_core),
418 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
419 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
420 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
421 BFD_JUMP_TABLE_WRITE (_bfd_generic),
422 BFD_JUMP_TABLE_LINK (_bfd_nolink),
423 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
424
425 NULL,
426
427 NULL /* backend_data */
428 };
429