1 /* BFD back-end for HP/UX core files. 2 Copyright 1993, 1994, 1996, 1998, 1999, 2001, 2002, 2003, 2004, 2006, 3 2007 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/user.h> /* After a.out.h */ 70 #include <sys/file.h> 71 72 /* Kludge: There's no explicit mechanism provided by sys/core.h to 73 conditionally know whether a proc_info has thread id fields. 74 However, CORE_ANON_SHMEM shows up first at 10.30, which is 75 happily also when meaningful thread id's show up in proc_info. */ 76 #if defined(CORE_ANON_SHMEM) 77 #define PROC_INFO_HAS_THREAD_ID (1) 78 #endif 79 80 /* This type appears at HP-UX 10.30. Defining it if not defined 81 by sys/core.h allows us to build for older HP-UX's, and (since 82 it won't be encountered in core-dumps from older HP-UX's) is 83 harmless. */ 84 #if !defined(CORE_ANON_SHMEM) 85 #define CORE_ANON_SHMEM 0x00000200 /* anonymous shared memory */ 86 #endif 87 88 /* These are stored in the bfd's tdata */ 89 90 /* .lwpid and .user_tid are only valid if PROC_INFO_HAS_THREAD_ID, else they 91 are set to 0. Also, until HP-UX implements MxN threads, .user_tid and 92 .lwpid are synonymous. */ 93 struct hpux_core_struct 94 { 95 int sig; 96 int lwpid; /* Kernel thread ID. */ 97 unsigned long user_tid; /* User thread ID. */ 98 char cmd[MAXCOMLEN + 1]; 99 }; 100 101 #define core_hdr(bfd) ((bfd)->tdata.hpux_core_data) 102 #define core_signal(bfd) (core_hdr(bfd)->sig) 103 #define core_command(bfd) (core_hdr(bfd)->cmd) 104 #define core_kernel_thread_id(bfd) (core_hdr(bfd)->lwpid) 105 #define core_user_thread_id(bfd) (core_hdr(bfd)->user_tid) 106 #define hpux_core_core_file_matches_executable_p generic_core_file_matches_executable_p 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 } 364 365 366 /* 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 }; 429