| 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 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 * |
| 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 |
| 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 * |
| 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 * |
| 354 | hpux_core_core_file_failing_command (bfd *abfd) |
| 355 | { |
| 356 | return core_command (abfd); |
| 357 | } |
| 358 | |
| 359 | static int |
| 360 | hpux_core_core_file_failing_signal (bfd *abfd) |
| 361 | { |
| 362 | return core_signal (abfd); |
| 363 | } |
| 364 | |
| 365 | \f |
| 366 | /* If somebody calls any byte-swapping routines, shoot them. */ |
| 367 | static 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 | 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 | (PTR) 0 /* backend_data */ |
| 428 | }; |