bfd/hpux-core.c

   1 /* BFD back-end for HP/UX core files.
   2    Copyright 1993, 1994, 1996, 1998, 1999, 2001
   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 #include <machine/reg.h>
  65 #include <sys/user.h>           /* After a.out.h  */
  66 #include <sys/file.h>
  67
  68 /* Kludge: There's no explicit mechanism provided by sys/core.h to
  69    conditionally know whether a proc_info has thread id fields.
  70    However, CORE_ANON_SHMEM shows up first at 10.30, which is
  71    happily also when meaningful thread id's show up in proc_info. */
  72 #if defined(CORE_ANON_SHMEM)
  73 #define PROC_INFO_HAS_THREAD_ID (1)
  74 #endif
  75
  76 /* This type appears at HP-UX 10.30.  Defining it if not defined
  77    by sys/core.h allows us to build for older HP-UX's, and (since
  78    it won't be encountered in core-dumps from older HP-UX's) is
  79    harmless. */
  80 #if !defined(CORE_ANON_SHMEM)
  81 #define CORE_ANON_SHMEM 0x00000200         /* anonymous shared memory */
  82 #endif
  83
  84 /* These are stored in the bfd's tdata */
  85
  86 /* .lwpid and .user_tid are only valid if PROC_INFO_HAS_THREAD_ID, else they
  87    are set to 0.  Also, until HP-UX implements MxN threads, .user_tid and
  88    .lwpid are synonymous. */
  89 struct hpux_core_struct
  90 {
  91   int sig;
  92   int lwpid;               /* Kernel thread ID. */
  93   unsigned long user_tid;  /* User thread ID. */
  94   char cmd[MAXCOMLEN + 1];
  95 };
  96
  97 #define core_hdr(bfd) ((bfd)->tdata.hpux_core_data)
  98 #define core_signal(bfd) (core_hdr(bfd)->sig)
  99 #define core_command(bfd) (core_hdr(bfd)->cmd)
 100 #define core_kernel_thread_id(bfd) (core_hdr(bfd)->lwpid)
 101 #define core_user_thread_id(bfd) (core_hdr(bfd)->user_tid)
 102
 103 static asection *make_bfd_asection
 104   PARAMS ((bfd *, const char *, flagword, bfd_size_type, bfd_vma,
 105            unsigned int));
 106 static asymbol *hpux_core_make_empty_symbol PARAMS ((bfd *));
 107 static const bfd_target *hpux_core_core_file_p PARAMS ((bfd *));
 108 static char *hpux_core_core_file_failing_command PARAMS ((bfd *));
 109 static int hpux_core_core_file_failing_signal PARAMS ((bfd *));
 110 static boolean hpux_core_core_file_matches_executable_p
 111   PARAMS ((bfd *, bfd *));
 112 static void swap_abort PARAMS ((void));
 113
 114 static asection *
 115 make_bfd_asection (abfd, name, flags, _raw_size, vma, alignment_power)
 116      bfd *abfd;
 117      const char *name;
 118      flagword flags;
 119      bfd_size_type _raw_size;
 120      bfd_vma vma;
 121      unsigned int alignment_power;
 122 {
 123   asection *asect;
 124   char *newname;
 125
 126   newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1);
 127   if (!newname)
 128     return NULL;
 129
 130   strcpy (newname, name);
 131
 132   asect = bfd_make_section_anyway (abfd, newname);
 133   if (!asect)
 134     return NULL;
 135
 136   asect->flags = flags;
 137   asect->_raw_size = _raw_size;
 138   asect->vma = vma;
 139   asect->filepos = bfd_tell (abfd);
 140   asect->alignment_power = alignment_power;
 141
 142   return asect;
 143 }
 144
 145 static asymbol *
 146 hpux_core_make_empty_symbol (abfd)
 147      bfd *abfd;
 148 {
 149   asymbol *new;
 150
 151   new = (asymbol *) bfd_zalloc (abfd, (bfd_size_type) sizeof (asymbol));
 152   if (new)
 153     new->the_bfd = abfd;
 154   return new;
 155 }
 156
 157 /* this function builds a bfd target if the file is a corefile.
 158    It returns null or 0 if it finds out thaat it is not a core file.
 159    The way it checks this is by looking for allowed 'type' field values.
 160    These are declared in sys/core.h
 161    There are some values which are 'reserved for future use'. In particular
 162    CORE_NONE is actually defined as 0. This may be a catch-all for cases
 163    in which the core file is generated by some non-hpux application.
 164    (I am just guessing here!)
 165 */
 166 static const bfd_target *
 167 hpux_core_core_file_p (abfd)
 168      bfd *abfd;
 169 {
 170   int  good_sections = 0;
 171   int  unknown_sections = 0;
 172
 173   core_hdr (abfd) = (struct hpux_core_struct *)
 174     bfd_zalloc (abfd, (bfd_size_type) sizeof (struct hpux_core_struct));
 175   if (!core_hdr (abfd))
 176     return NULL;
 177
 178   while (1)
 179     {
 180       int val;
 181       struct corehead core_header;
 182
 183       val = bfd_bread ((void *) &core_header,
 184                       (bfd_size_type) sizeof core_header, abfd);
 185       if (val <= 0)
 186         break;
 187       switch (core_header.type)
 188         {
 189         case CORE_KERNEL:
 190         case CORE_FORMAT:
 191           /* Just skip this.  */
 192           bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
 193           good_sections++;
 194           break;
 195         case CORE_EXEC:
 196           {
 197             struct proc_exec proc_exec;
 198             if (bfd_bread ((void *) &proc_exec, (bfd_size_type) core_header.len,
 199                           abfd) != core_header.len)
 200               break;
 201             strncpy (core_command (abfd), proc_exec.cmd, MAXCOMLEN + 1);
 202             good_sections++;
 203           }
 204           break;
 205         case CORE_PROC:
 206           {
 207             struct proc_info proc_info;
 208             char  secname[100];  /* Of arbitrary size, but plenty large. */
 209
 210             /* We need to read this section, 'cause we need to determine
 211                whether the core-dumped app was threaded before we create
 212                any .reg sections. */
 213             if (bfd_bread (&proc_info, (bfd_size_type) core_header.len, abfd)
 214                 != core_header.len)
 215               break;
 216
 217               /* However, we also want to create those sections with the
 218                  file positioned at the start of the record, it seems. */
 219             if (bfd_seek (abfd, (file_ptr) -core_header.len, SEEK_CUR) != 0)
 220               break;
 221
 222 #if defined(PROC_INFO_HAS_THREAD_ID)
 223             core_kernel_thread_id (abfd) = proc_info.lwpid;
 224             core_user_thread_id (abfd) = proc_info.user_tid;
 225 #else
 226             core_kernel_thread_id (abfd) = 0;
 227             core_user_thread_id (abfd) = 0;
 228 #endif
 229             /* If the program was unthreaded, then we'll just create a
 230                .reg section.
 231
 232                If the program was threaded, then we'll create .reg/XXXXX
 233                section for each thread, where XXXXX is a printable
 234                representation of the kernel thread id.  We'll also
 235                create a .reg section for the thread that was running
 236                and signalled at the time of the core-dump (i.e., this
 237                is effectively an alias, needed to keep GDB happy.)
 238
 239                Note that we use `.reg/XXXXX' as opposed to '.regXXXXX'
 240                because GDB expects that .reg2 will be the floating-
 241                point registers. */
 242             if (core_kernel_thread_id (abfd) == 0)
 243               {
 244                 if (!make_bfd_asection (abfd, ".reg",
 245                                         SEC_HAS_CONTENTS,
 246                                         core_header.len,
 247                                         (int) &proc_info - (int) & proc_info.hw_regs,
 248                                         2))
 249                   return NULL;
 250               }
 251             else
 252               {
 253                 /* There are threads.  Is this the one that caused the
 254                    core-dump?  We'll claim it was the running thread. */
 255                 if (proc_info.sig != -1)
 256                   {
 257                     if (!make_bfd_asection (abfd, ".reg",
 258                                             SEC_HAS_CONTENTS,
 259                                             core_header.len,
 260                                             (int) &proc_info - (int) & proc_info.hw_regs,
 261                                             2))
 262                       return NULL;
 263                   }
 264                 /* We always make one of these sections, for every thread. */
 265                 sprintf (secname, ".reg/%d", core_kernel_thread_id (abfd));
 266                 if (!make_bfd_asection (abfd, secname,
 267                                         SEC_HAS_CONTENTS,
 268                                         core_header.len,
 269                                         (int) &proc_info - (int) & proc_info.hw_regs,
 270                                         2))
 271                   return NULL;
 272               }
 273             core_signal (abfd) = proc_info.sig;
 274             if (bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR) != 0)
 275               break;
 276             good_sections++;
 277           }
 278           break;
 279
 280         case CORE_DATA:
 281         case CORE_STACK:
 282         case CORE_TEXT:
 283         case CORE_MMF:
 284         case CORE_SHM:
 285         case CORE_ANON_SHMEM:
 286           if (!make_bfd_asection (abfd, ".data",
 287                                   SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 288                                   core_header.len, core_header.addr, 2))
 289             return NULL;
 290
 291           bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
 292           good_sections++;
 293           break;
 294
 295         case CORE_NONE:
 296           /* Let's not punt if we encounter a section of unknown
 297              type.  Rather, let's make a note of it.  If we later
 298              see that there were also "good" sections, then we'll
 299              declare that this a core file, but we'll also warn that
 300              it may be incompatible with this gdb.
 301              */
 302           unknown_sections++;
 303           break;
 304
 305          default: return 0; /*unrecognized core file type */
 306         }
 307     }
 308
 309   /* OK, we believe you.  You're a core file (sure, sure).  */
 310
 311   /* Were there sections of unknown type?  If so, yet there were
 312      at least some complete sections of known type, then, issue
 313      a warning.  Possibly the core file was generated on a version
 314      of HP-UX that is incompatible with that for which this gdb was
 315      built.
 316      */
 317   if ((unknown_sections > 0) && (good_sections > 0))
 318     (*_bfd_error_handler)
 319       ("%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",
 320        abfd->filename);
 321
 322   return abfd->xvec;
 323 }
 324
 325 static char *
 326 hpux_core_core_file_failing_command (abfd)
 327      bfd *abfd;
 328 {
 329   return core_command (abfd);
 330 }
 331
 332 /* ARGSUSED */
 333 static int
 334 hpux_core_core_file_failing_signal (abfd)
 335      bfd *abfd;
 336 {
 337   return core_signal (abfd);
 338 }
 339
 340 /* ARGSUSED */
 341 static boolean
 342 hpux_core_core_file_matches_executable_p (core_bfd, exec_bfd)
 343      bfd *core_bfd ATTRIBUTE_UNUSED;
 344      bfd *exec_bfd ATTRIBUTE_UNUSED;
 345 {
 346   return true;                  /* FIXME, We have no way of telling at this point */
 347 }
 348 \f
 349 #define hpux_core_get_symtab_upper_bound _bfd_nosymbols_get_symtab_upper_bound
 350 #define hpux_core_get_symtab _bfd_nosymbols_get_symtab
 351 #define hpux_core_print_symbol _bfd_nosymbols_print_symbol
 352 #define hpux_core_get_symbol_info _bfd_nosymbols_get_symbol_info
 353 #define hpux_core_bfd_is_local_label_name \
 354   _bfd_nosymbols_bfd_is_local_label_name
 355 #define hpux_core_get_lineno _bfd_nosymbols_get_lineno
 356 #define hpux_core_find_nearest_line _bfd_nosymbols_find_nearest_line
 357 #define hpux_core_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
 358 #define hpux_core_read_minisymbols _bfd_nosymbols_read_minisymbols
 359 #define hpux_core_minisymbol_to_symbol _bfd_nosymbols_minisymbol_to_symbol
 360
 361 /* If somebody calls any byte-swapping routines, shoot them.  */
 362 static void
 363 swap_abort ()
 364 {
 365   abort(); /* This way doesn't require any declaration for ANSI to fuck up */
 366 }
 367 #define NO_GET  ((bfd_vma (*) PARAMS ((   const bfd_byte *))) swap_abort )
 368 #define NO_PUT  ((void    (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort )
 369 #define NO_SIGNED_GET \
 370   ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort )
 371
 372 const bfd_target hpux_core_vec =
 373   {
 374     "hpux-core",
 375     bfd_target_unknown_flavour,
 376     BFD_ENDIAN_BIG,             /* target byte order */
 377     BFD_ENDIAN_BIG,             /* target headers byte order */
 378     (HAS_RELOC | EXEC_P |       /* object flags */
 379      HAS_LINENO | HAS_DEBUG |
 380      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 381     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 382     0,                                                     /* symbol prefix */
 383     ' ',                                                   /* ar_pad_char */
 384     16,                                                    /* ar_max_namelen */
 385     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit data */
 386     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit data */
 387     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit data */
 388     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit hdrs */
 389     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit hdrs */
 390     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit hdrs */
 391
 392     {                           /* bfd_check_format */
 393      _bfd_dummy_target,         /* unknown format */
 394      _bfd_dummy_target,         /* object file */
 395      _bfd_dummy_target,         /* archive */
 396      hpux_core_core_file_p      /* a core file */
 397     },
 398     {                           /* bfd_set_format */
 399      bfd_false, bfd_false,
 400      bfd_false, bfd_false
 401     },
 402     {                           /* bfd_write_contents */
 403      bfd_false, bfd_false,
 404      bfd_false, bfd_false
 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 (hpux_core),
 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     (PTR) 0                     /* backend_data */
 420 };