1 /* BFD back-end for HP/UX core files.
2 Copyright (C) 1993-2024 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_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 #include <dirent.h>
52 #include <signal.h>
53 #ifdef HPUX_CORE
54 #include <machine/reg.h>
55 #endif
56 #include <sys/file.h>
57
58 /* Kludge: There's no explicit mechanism provided by sys/core.h to
59 conditionally know whether a proc_info has thread id fields.
60 However, CORE_ANON_SHMEM shows up first at 10.30, which is
61 happily also when meaningful thread id's show up in proc_info. */
62 #if defined(CORE_ANON_SHMEM)
63 #define PROC_INFO_HAS_THREAD_ID (1)
64 #endif
65
66 /* This type appears at HP-UX 10.30. Defining it if not defined
67 by sys/core.h allows us to build for older HP-UX's, and (since
68 it won't be encountered in core-dumps from older HP-UX's) is
69 harmless. */
70 #if !defined(CORE_ANON_SHMEM)
71 #define CORE_ANON_SHMEM 0x00000200 /* anonymous shared memory */
72 #endif
73
74 /* These are stored in the bfd's tdata */
75
76 /* .lwpid and .user_tid are only valid if PROC_INFO_HAS_THREAD_ID, else they
77 are set to 0. Also, until HP-UX implements MxN threads, .user_tid and
78 .lwpid are synonymous. */
79 struct hpux_core_struct
80 {
81 int sig;
82 int lwpid; /* Kernel thread ID. */
83 unsigned long user_tid; /* User thread ID. */
84 char cmd[MAXCOMLEN + 1];
85 };
86
87 #define core_hdr(bfd) ((bfd)->tdata.hpux_core_data)
88 #define core_signal(bfd) (core_hdr(bfd)->sig)
89 #define core_command(bfd) (core_hdr(bfd)->cmd)
90 #define core_kernel_thread_id(bfd) (core_hdr(bfd)->lwpid)
91 #define core_user_thread_id(bfd) (core_hdr(bfd)->user_tid)
92 #define hpux_core_core_file_matches_executable_p generic_core_file_matches_executable_p
93 #define hpux_core_core_file_pid _bfd_nocore_core_file_pid
94
95 static asection *make_bfd_asection (bfd *, const char *, flagword,
96 bfd_size_type, bfd_vma, unsigned int);
97 static bfd_cleanup hpux_core_core_file_p (bfd *);
98 static char *hpux_core_core_file_failing_command (bfd *);
99 static int hpux_core_core_file_failing_signal (bfd *);
100 static void swap_abort (void);
101
102 static asection *
make_bfd_asection(bfd * abfd,const char * name,flagword flags,bfd_size_type size,bfd_vma vma,unsigned int alignment_power)103 make_bfd_asection (bfd *abfd, const char *name, flagword flags,
104 bfd_size_type size, bfd_vma vma,
105 unsigned int alignment_power)
106 {
107 asection *asect;
108 char *newname;
109
110 newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1);
111 if (!newname)
112 return NULL;
113
114 strcpy (newname, name);
115
116 asect = bfd_make_section_anyway_with_flags (abfd, newname, flags);
117 if (!asect)
118 return NULL;
119
120 asect->size = size;
121 asect->vma = vma;
122 asect->filepos = bfd_tell (abfd);
123 asect->alignment_power = alignment_power;
124
125 return asect;
126 }
127
128 /* Return true if the given core file section corresponds to a thread,
129 based on its name. */
130
131 static int
thread_section_p(bfd * abfd ATTRIBUTE_UNUSED,asection * sect,void * obj ATTRIBUTE_UNUSED)132 thread_section_p (bfd *abfd ATTRIBUTE_UNUSED,
133 asection *sect,
134 void *obj ATTRIBUTE_UNUSED)
135 {
136 return startswith (sect->name, ".reg/");
137 }
138
139 /* this function builds a bfd target if the file is a corefile.
140 It returns null or 0 if it finds out thaat it is not a core file.
141 The way it checks this is by looking for allowed 'type' field values.
142 These are declared in sys/core.h
143 There are some values which are 'reserved for future use'. In particular
144 CORE_NONE is actually defined as 0. This may be a catch-all for cases
145 in which the core file is generated by some non-hpux application.
146 (I am just guessing here!)
147 */
148 static bfd_cleanup
hpux_core_core_file_p(bfd * abfd)149 hpux_core_core_file_p (bfd *abfd)
150 {
151 int good_sections = 0;
152 int unknown_sections = 0;
153
154 core_hdr (abfd) = (struct hpux_core_struct *)
155 bfd_zalloc (abfd, (bfd_size_type) sizeof (struct hpux_core_struct));
156 if (!core_hdr (abfd))
157 return NULL;
158
159 while (1)
160 {
161 int val;
162 struct corehead core_header;
163
164 val = bfd_read (&core_header, sizeof core_header, abfd);
165 if (val <= 0)
166 break;
167 switch (core_header.type)
168 {
169 case CORE_KERNEL:
170 case CORE_FORMAT:
171 /* Just skip this. */
172 bfd_seek (abfd, core_header.len, SEEK_CUR);
173 good_sections++;
174 break;
175 case CORE_EXEC:
176 {
177 struct proc_exec proc_exec;
178 if (bfd_read (&proc_exec, core_header.len, abfd) != core_header.len)
179 break;
180 strncpy (core_command (abfd), proc_exec.cmd, MAXCOMLEN + 1);
181 good_sections++;
182 }
183 break;
184 case CORE_PROC:
185 {
186 struct proc_info proc_info;
187 char secname[100]; /* Of arbitrary size, but plenty large. */
188
189 /* We need to read this section, 'cause we need to determine
190 whether the core-dumped app was threaded before we create
191 any .reg sections. */
192 if (bfd_read (&proc_info, core_header.len, abfd) != core_header.len)
193 break;
194
195 /* However, we also want to create those sections with the
196 file positioned at the start of the record, it seems. */
197 if (bfd_seek (abfd, -(file_ptr) core_header.len, SEEK_CUR) != 0)
198 break;
199
200 #if defined(PROC_INFO_HAS_THREAD_ID)
201 core_kernel_thread_id (abfd) = proc_info.lwpid;
202 core_user_thread_id (abfd) = proc_info.user_tid;
203 #else
204 core_kernel_thread_id (abfd) = 0;
205 core_user_thread_id (abfd) = 0;
206 #endif
207 /* If the program was unthreaded, then we'll just create a
208 .reg section.
209
210 If the program was threaded, then we'll create .reg/XXXXX
211 section for each thread, where XXXXX is a printable
212 representation of the kernel thread id. We'll also
213 create a .reg section for the thread that was running
214 and signalled at the time of the core-dump (i.e., this
215 is effectively an alias, needed to keep GDB happy.)
216
217 Note that we use `.reg/XXXXX' as opposed to '.regXXXXX'
218 because GDB expects that .reg2 will be the floating-
219 point registers. */
220 if (core_kernel_thread_id (abfd) == 0)
221 {
222 if (!make_bfd_asection (abfd, ".reg",
223 SEC_HAS_CONTENTS,
224 core_header.len,
225 (bfd_vma) offsetof (struct proc_info,
226 hw_regs),
227 2))
228 goto fail;
229 }
230 else
231 {
232 /* There are threads. Is this the one that caused the
233 core-dump? We'll claim it was the running thread. */
234 if (proc_info.sig != -1)
235 {
236 if (!make_bfd_asection (abfd, ".reg",
237 SEC_HAS_CONTENTS,
238 core_header.len,
239 (bfd_vma)offsetof (struct proc_info,
240 hw_regs),
241 2))
242 goto fail;
243 }
244 /* We always make one of these sections, for every thread. */
245 sprintf (secname, ".reg/%d", core_kernel_thread_id (abfd));
246 if (!make_bfd_asection (abfd, secname,
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 core_signal (abfd) = proc_info.sig;
255 if (bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR) != 0)
256 break;
257 good_sections++;
258 }
259 break;
260
261 case CORE_DATA:
262 case CORE_STACK:
263 case CORE_TEXT:
264 case CORE_MMF:
265 case CORE_SHM:
266 case CORE_ANON_SHMEM:
267 if (!make_bfd_asection (abfd, ".data",
268 SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
269 core_header.len,
270 (bfd_vma) core_header.addr, 2))
271 goto fail;
272
273 bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
274 good_sections++;
275 break;
276
277 case CORE_NONE:
278 /* Let's not punt if we encounter a section of unknown
279 type. Rather, let's make a note of it. If we later
280 see that there were also "good" sections, then we'll
281 declare that this a core file, but we'll also warn that
282 it may be incompatible with this gdb.
283 */
284 unknown_sections++;
285 break;
286
287 default:
288 goto fail; /*unrecognized core file type */
289 }
290 }
291
292 /* OK, we believe you. You're a core file (sure, sure). */
293
294 /* On HP/UX, we sometimes encounter core files where none of the threads
295 was found to be the running thread (ie the signal was set to -1 for
296 all threads). This happens when the program was aborted externally
297 via a TT_CORE ttrace system call. In that case, we just pick one
298 thread at random to be the active thread. */
299 if (core_kernel_thread_id (abfd) != 0
300 && bfd_get_section_by_name (abfd, ".reg") == NULL)
301 {
302 asection *asect = bfd_sections_find_if (abfd, thread_section_p, NULL);
303 asection *reg_sect;
304
305 if (asect != NULL)
306 {
307 reg_sect = make_bfd_asection (abfd, ".reg", asect->flags,
308 asect->size, asect->vma,
309 asect->alignment_power);
310 if (reg_sect == NULL)
311 goto fail;
312
313 reg_sect->filepos = asect->filepos;
314 }
315 }
316
317 /* Were there sections of unknown type? If so, yet there were
318 at least some complete sections of known type, then, issue
319 a warning. Possibly the core file was generated on a version
320 of HP-UX that is incompatible with that for which this gdb was
321 built.
322 */
323 if ((unknown_sections > 0) && (good_sections > 0))
324 _bfd_error_handler
325 ("%pB appears to be a core file,\nbut contains unknown sections."
326 " It may have been created on an incompatible\nversion of HP-UX."
327 " As a result, some information may be unavailable.\n",
328 abfd);
329
330 return _bfd_no_cleanup;
331
332 fail:
333 bfd_release (abfd, core_hdr (abfd));
334 core_hdr (abfd) = NULL;
335 bfd_section_list_clear (abfd);
336 return NULL;
337 }
338
339 static char *
hpux_core_core_file_failing_command(bfd * abfd)340 hpux_core_core_file_failing_command (bfd *abfd)
341 {
342 return core_command (abfd);
343 }
344
345 static int
hpux_core_core_file_failing_signal(bfd * abfd)346 hpux_core_core_file_failing_signal (bfd *abfd)
347 {
348 return core_signal (abfd);
349 }
350
351
352 /* If somebody calls any byte-swapping routines, shoot them. */
353 static void
swap_abort(void)354 swap_abort (void)
355 {
356 abort(); /* This way doesn't require any declaration for ANSI to fuck up */
357 }
358
359 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
360 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
361 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
362 #define NO_GET64 ((uint64_t (*) (const void *)) swap_abort)
363 #define NO_PUT64 ((void (*) (uint64_t, void *)) swap_abort)
364 #define NO_GETS64 ((int64_t (*) (const void *)) swap_abort)
365
366 const bfd_target core_hpux_vec =
367 {
368 "hpux-core",
369 bfd_target_unknown_flavour,
370 BFD_ENDIAN_BIG, /* target byte order */
371 BFD_ENDIAN_BIG, /* target headers byte order */
372 (HAS_RELOC | EXEC_P | /* object flags */
373 HAS_LINENO | HAS_DEBUG |
374 HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
375 (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
376 0, /* symbol prefix */
377 ' ', /* ar_pad_char */
378 16, /* ar_max_namelen */
379 0, /* match priority. */
380 TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols. */
381 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit data */
382 NO_GET, NO_GETS, NO_PUT, /* 32 bit data */
383 NO_GET, NO_GETS, NO_PUT, /* 16 bit data */
384 NO_GET64, NO_GETS64, NO_PUT64, /* 64 bit hdrs */
385 NO_GET, NO_GETS, NO_PUT, /* 32 bit hdrs */
386 NO_GET, NO_GETS, NO_PUT, /* 16 bit hdrs */
387
388 { /* bfd_check_format */
389 _bfd_dummy_target, /* unknown format */
390 _bfd_dummy_target, /* object file */
391 _bfd_dummy_target, /* archive */
392 hpux_core_core_file_p /* a core file */
393 },
394 { /* bfd_set_format */
395 _bfd_bool_bfd_false_error,
396 _bfd_bool_bfd_false_error,
397 _bfd_bool_bfd_false_error,
398 _bfd_bool_bfd_false_error
399 },
400 { /* bfd_write_contents */
401 _bfd_bool_bfd_false_error,
402 _bfd_bool_bfd_false_error,
403 _bfd_bool_bfd_false_error,
404 _bfd_bool_bfd_false_error
405 },
406
407 BFD_JUMP_TABLE_GENERIC (_bfd_generic),
408 BFD_JUMP_TABLE_COPY (_bfd_generic),
409 BFD_JUMP_TABLE_CORE (hpux_core),
410 BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
411 BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
412 BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
413 BFD_JUMP_TABLE_WRITE (_bfd_generic),
414 BFD_JUMP_TABLE_LINK (_bfd_nolink),
415 BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
416
417 NULL,
418
419 NULL /* backend_data */
420 };
421