bfd/hpux-core.c

   1 /* BFD back-end for HP/UX core files.
   2    Copyright 1993, 1994, 1996, 1998, 1999, 2001, 2002, 2003, 2004
   3    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 2 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, MA 02110-1301, USA.  */
  22
  23 /* This file can only be compiled on systems which use HP/UX style
  24    core files.  */
  25
  26 #include "bfd.h"
  27 #include "sysdep.h"
  28 #include "libbfd.h"
  29
  30 #if defined (HOST_HPPAHPUX) || defined (HOST_HP300HPUX) || defined (HOST_HPPAMPEIX)
  31
  32 /* FIXME: sys/core.h doesn't exist for HPUX version 7.  HPUX version
  33    5, 6, and 7 core files seem to be standard trad-core.c type core
  34    files; can we just use trad-core.c in addition to this file?  */
  35
  36 #include <sys/core.h>
  37 #include <sys/utsname.h>
  38
  39 #endif /* HOST_HPPAHPUX */
  40
  41 #ifdef HOST_HPPABSD
  42
  43 /* Not a very swift place to put it, but that's where the BSD port
  44    puts them.  */
  45 #include "/hpux/usr/include/sys/core.h"
  46
  47 #endif /* HOST_HPPABSD */
  48
  49 #include <sys/param.h>
  50 #ifdef HAVE_DIRENT_H
  51 # include <dirent.h>
  52 #else
  53 # ifdef HAVE_SYS_NDIR_H
  54 #  include <sys/ndir.h>
  55 # endif
  56 # ifdef HAVE_SYS_DIR_H
  57 #  include <sys/dir.h>
  58 # endif
  59 # ifdef HAVE_NDIR_H
  60 #  include <ndir.h>
  61 # endif
  62 #endif
  63 #include <signal.h>
  64 #ifdef HPUX_CORE
  65 #include <machine/reg.h>
  66 #endif
  67 #include <sys/user.h>           /* After a.out.h  */
  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
 105 static asection *make_bfd_asection
 106   PARAMS ((bfd *, const char *, flagword, bfd_size_type, bfd_vma,
 107            unsigned int));
 108 static const bfd_target *hpux_core_core_file_p
 109   PARAMS ((bfd *));
 110 static char *hpux_core_core_file_failing_command
 111   PARAMS ((bfd *));
 112 static int hpux_core_core_file_failing_signal
 113   PARAMS ((bfd *));
 114 static bfd_boolean hpux_core_core_file_matches_executable_p
 115   PARAMS ((bfd *, bfd *));
 116 static void swap_abort
 117   PARAMS ((void));
 118
 119 static asection *
 120 make_bfd_asection (abfd, name, flags, size, vma, alignment_power)
 121      bfd *abfd;
 122      const char *name;
 123      flagword flags;
 124      bfd_size_type size;
 125      bfd_vma vma;
 126      unsigned int alignment_power;
 127 {
 128   asection *asect;
 129   char *newname;
 130
 131   newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1);
 132   if (!newname)
 133     return NULL;
 134
 135   strcpy (newname, name);
 136
 137   asect = bfd_make_section_anyway (abfd, newname);
 138   if (!asect)
 139     return NULL;
 140
 141   asect->flags = flags;
 142   asect->size = size;
 143   asect->vma = vma;
 144   asect->filepos = bfd_tell (abfd);
 145   asect->alignment_power = alignment_power;
 146
 147   return asect;
 148 }
 149
 150 /* Return true if the given core file section corresponds to a thread,
 151    based on its name.  */
 152
 153 static int
 154 thread_section_p (bfd *abfd ATTRIBUTE_UNUSED,
 155                   asection *sect,
 156                   void *obj ATTRIBUTE_UNUSED)
 157 {
 158   return (strncmp (bfd_section_name (abfd, sect), ".reg/", 5) == 0);
 159 }
 160
 161 /* this function builds a bfd target if the file is a corefile.
 162    It returns null or 0 if it finds out thaat it is not a core file.
 163    The way it checks this is by looking for allowed 'type' field values.
 164    These are declared in sys/core.h
 165    There are some values which are 'reserved for future use'. In particular
 166    CORE_NONE is actually defined as 0. This may be a catch-all for cases
 167    in which the core file is generated by some non-hpux application.
 168    (I am just guessing here!)
 169 */
 170 static const bfd_target *
 171 hpux_core_core_file_p (abfd)
 172      bfd *abfd;
 173 {
 174   int  good_sections = 0;
 175   int  unknown_sections = 0;
 176
 177   core_hdr (abfd) = (struct hpux_core_struct *)
 178     bfd_zalloc (abfd, (bfd_size_type) sizeof (struct hpux_core_struct));
 179   if (!core_hdr (abfd))
 180     return NULL;
 181
 182   while (1)
 183     {
 184       int val;
 185       struct corehead core_header;
 186
 187       val = bfd_bread ((void *) &core_header,
 188                       (bfd_size_type) sizeof core_header, abfd);
 189       if (val <= 0)
 190         break;
 191       switch (core_header.type)
 192         {
 193         case CORE_KERNEL:
 194         case CORE_FORMAT:
 195           /* Just skip this.  */
 196           bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
 197           good_sections++;
 198           break;
 199         case CORE_EXEC:
 200           {
 201             struct proc_exec proc_exec;
 202             if (bfd_bread ((void *) &proc_exec, (bfd_size_type) core_header.len,
 203                           abfd) != core_header.len)
 204               break;
 205             strncpy (core_command (abfd), proc_exec.cmd, MAXCOMLEN + 1);
 206             good_sections++;
 207           }
 208           break;
 209         case CORE_PROC:
 210           {
 211             struct proc_info proc_info;
 212             char  secname[100];  /* Of arbitrary size, but plenty large. */
 213
 214             /* We need to read this section, 'cause we need to determine
 215                whether the core-dumped app was threaded before we create
 216                any .reg sections. */
 217             if (bfd_bread (&proc_info, (bfd_size_type) core_header.len, abfd)
 218                 != core_header.len)
 219               break;
 220
 221               /* However, we also want to create those sections with the
 222                  file positioned at the start of the record, it seems. */
 223             if (bfd_seek (abfd, -((file_ptr) core_header.len), SEEK_CUR) != 0)
 224               break;
 225
 226 #if defined(PROC_INFO_HAS_THREAD_ID)
 227             core_kernel_thread_id (abfd) = proc_info.lwpid;
 228             core_user_thread_id (abfd) = proc_info.user_tid;
 229 #else
 230             core_kernel_thread_id (abfd) = 0;
 231             core_user_thread_id (abfd) = 0;
 232 #endif
 233             /* If the program was unthreaded, then we'll just create a
 234                .reg section.
 235
 236                If the program was threaded, then we'll create .reg/XXXXX
 237                section for each thread, where XXXXX is a printable
 238                representation of the kernel thread id.  We'll also
 239                create a .reg section for the thread that was running
 240                and signalled at the time of the core-dump (i.e., this
 241                is effectively an alias, needed to keep GDB happy.)
 242
 243                Note that we use `.reg/XXXXX' as opposed to '.regXXXXX'
 244                because GDB expects that .reg2 will be the floating-
 245                point registers. */
 246             if (core_kernel_thread_id (abfd) == 0)
 247               {
 248                 if (!make_bfd_asection (abfd, ".reg",
 249                                         SEC_HAS_CONTENTS,
 250                                         core_header.len,
 251                                         (bfd_vma) offsetof (struct proc_info,
 252                                                             hw_regs),
 253                                         2))
 254                   goto fail;
 255               }
 256             else
 257               {
 258                 /* There are threads.  Is this the one that caused the
 259                    core-dump?  We'll claim it was the running thread. */
 260                 if (proc_info.sig != -1)
 261                   {
 262                     if (!make_bfd_asection (abfd, ".reg",
 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                 /* We always make one of these sections, for every thread. */
 271                 sprintf (secname, ".reg/%d", core_kernel_thread_id (abfd));
 272                 if (!make_bfd_asection (abfd, secname,
 273                                         SEC_HAS_CONTENTS,
 274                                         core_header.len,
 275                                         (bfd_vma) offsetof (struct proc_info,
 276                                                             hw_regs),
 277                                         2))
 278                   goto fail;
 279               }
 280             core_signal (abfd) = proc_info.sig;
 281             if (bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR) != 0)
 282               break;
 283             good_sections++;
 284           }
 285           break;
 286
 287         case CORE_DATA:
 288         case CORE_STACK:
 289         case CORE_TEXT:
 290         case CORE_MMF:
 291         case CORE_SHM:
 292         case CORE_ANON_SHMEM:
 293           if (!make_bfd_asection (abfd, ".data",
 294                                   SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 295                                   core_header.len,
 296                                   (bfd_vma) core_header.addr, 2))
 297             goto fail;
 298
 299           bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
 300           good_sections++;
 301           break;
 302
 303         case CORE_NONE:
 304           /* Let's not punt if we encounter a section of unknown
 305              type.  Rather, let's make a note of it.  If we later
 306              see that there were also "good" sections, then we'll
 307              declare that this a core file, but we'll also warn that
 308              it may be incompatible with this gdb.
 309              */
 310           unknown_sections++;
 311           break;
 312
 313          default:
 314            goto fail; /*unrecognized core file type */
 315         }
 316     }
 317
 318   /* OK, we believe you.  You're a core file (sure, sure).  */
 319
 320   /* On HP/UX, we sometimes encounter core files where none of the threads
 321      was found to be the running thread (ie the signal was set to -1 for
 322      all threads).  This happens when the program was aborted externally
 323      via a TT_CORE ttrace system call.  In that case, we just pick one
 324      thread at random to be the active thread.  */
 325   if (core_kernel_thread_id (abfd) != 0
 326       && bfd_get_section_by_name (abfd, ".reg") == NULL)
 327     {
 328       asection *asect = bfd_sections_find_if (abfd, thread_section_p, NULL);
 329       asection *reg_sect;
 330
 331       if (asect != NULL)
 332         {
 333           reg_sect = make_bfd_asection (abfd, ".reg", asect->flags,
 334                                         asect->size, asect->vma,
 335                                         asect->alignment_power);
 336           if (reg_sect == NULL)
 337             goto fail;
 338
 339           reg_sect->filepos = asect->filepos;
 340         }
 341     }
 342
 343   /* Were there sections of unknown type?  If so, yet there were
 344      at least some complete sections of known type, then, issue
 345      a warning.  Possibly the core file was generated on a version
 346      of HP-UX that is incompatible with that for which this gdb was
 347      built.
 348      */
 349   if ((unknown_sections > 0) && (good_sections > 0))
 350     (*_bfd_error_handler)
 351       ("%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",
 352        abfd->filename);
 353
 354   return abfd->xvec;
 355
 356  fail:
 357   bfd_release (abfd, core_hdr (abfd));
 358   core_hdr (abfd) = NULL;
 359   bfd_section_list_clear (abfd);
 360   return NULL;
 361 }
 362
 363 static char *
 364 hpux_core_core_file_failing_command (abfd)
 365      bfd *abfd;
 366 {
 367   return core_command (abfd);
 368 }
 369
 370 static int
 371 hpux_core_core_file_failing_signal (abfd)
 372      bfd *abfd;
 373 {
 374   return core_signal (abfd);
 375 }
 376
 377 static bfd_boolean
 378 hpux_core_core_file_matches_executable_p (core_bfd, exec_bfd)
 379      bfd *core_bfd ATTRIBUTE_UNUSED;
 380      bfd *exec_bfd ATTRIBUTE_UNUSED;
 381 {
 382   return TRUE;                  /* FIXME, We have no way of telling at this point */
 383 }
 384 \f
 385 /* If somebody calls any byte-swapping routines, shoot them.  */
 386 static void
 387 swap_abort ()
 388 {
 389   abort(); /* This way doesn't require any declaration for ANSI to fuck up */
 390 }
 391
 392 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
 393 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
 394 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
 395 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
 396 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
 397 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
 398
 399 const bfd_target hpux_core_vec =
 400   {
 401     "hpux-core",
 402     bfd_target_unknown_flavour,
 403     BFD_ENDIAN_BIG,             /* target byte order */
 404     BFD_ENDIAN_BIG,             /* target headers byte order */
 405     (HAS_RELOC | EXEC_P |       /* object flags */
 406      HAS_LINENO | HAS_DEBUG |
 407      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 408     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 409     0,                                                     /* symbol prefix */
 410     ' ',                                                   /* ar_pad_char */
 411     16,                                                    /* ar_max_namelen */
 412     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit data */
 413     NO_GET, NO_GETS, NO_PUT,            /* 32 bit data */
 414     NO_GET, NO_GETS, NO_PUT,            /* 16 bit data */
 415     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit hdrs */
 416     NO_GET, NO_GETS, NO_PUT,            /* 32 bit hdrs */
 417     NO_GET, NO_GETS, NO_PUT,            /* 16 bit hdrs */
 418
 419     {                           /* bfd_check_format */
 420       _bfd_dummy_target,                /* unknown format */
 421       _bfd_dummy_target,                /* object file */
 422       _bfd_dummy_target,                /* archive */
 423       hpux_core_core_file_p             /* a core file */
 424     },
 425     {                           /* bfd_set_format */
 426       bfd_false, bfd_false,
 427       bfd_false, bfd_false
 428     },
 429     {                           /* bfd_write_contents */
 430       bfd_false, bfd_false,
 431       bfd_false, bfd_false
 432     },
 433
 434     BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 435     BFD_JUMP_TABLE_COPY (_bfd_generic),
 436     BFD_JUMP_TABLE_CORE (hpux_core),
 437     BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 438     BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 439     BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 440     BFD_JUMP_TABLE_WRITE (_bfd_generic),
 441     BFD_JUMP_TABLE_LINK (_bfd_nolink),
 442     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 443
 444     NULL,
 445
 446     (PTR) 0                     /* backend_data */
 447   };