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., 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 const bfd_target *hpux_core_core_file_p
 107   PARAMS ((bfd *));
 108 static char *hpux_core_core_file_failing_command
 109   PARAMS ((bfd *));
 110 static int hpux_core_core_file_failing_signal
 111   PARAMS ((bfd *));
 112 static bfd_boolean hpux_core_core_file_matches_executable_p
 113   PARAMS ((bfd *, bfd *));
 114 static void swap_abort
 115   PARAMS ((void));
 116
 117 static asection *
 118 make_bfd_asection (abfd, name, flags, _raw_size, vma, alignment_power)
 119      bfd *abfd;
 120      const char *name;
 121      flagword flags;
 122      bfd_size_type _raw_size;
 123      bfd_vma vma;
 124      unsigned int alignment_power;
 125 {
 126   asection *asect;
 127   char *newname;
 128
 129   newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1);
 130   if (!newname)
 131     return NULL;
 132
 133   strcpy (newname, name);
 134
 135   asect = bfd_make_section_anyway (abfd, newname);
 136   if (!asect)
 137     return NULL;
 138
 139   asect->flags = flags;
 140   asect->_raw_size = _raw_size;
 141   asect->vma = vma;
 142   asect->filepos = bfd_tell (abfd);
 143   asect->alignment_power = alignment_power;
 144
 145   return asect;
 146 }
 147
 148 /* this function builds a bfd target if the file is a corefile.
 149    It returns null or 0 if it finds out thaat it is not a core file.
 150    The way it checks this is by looking for allowed 'type' field values.
 151    These are declared in sys/core.h
 152    There are some values which are 'reserved for future use'. In particular
 153    CORE_NONE is actually defined as 0. This may be a catch-all for cases
 154    in which the core file is generated by some non-hpux application.
 155    (I am just guessing here!)
 156 */
 157 static const bfd_target *
 158 hpux_core_core_file_p (abfd)
 159      bfd *abfd;
 160 {
 161   int  good_sections = 0;
 162   int  unknown_sections = 0;
 163
 164   core_hdr (abfd) = (struct hpux_core_struct *)
 165     bfd_zalloc (abfd, (bfd_size_type) sizeof (struct hpux_core_struct));
 166   if (!core_hdr (abfd))
 167     return NULL;
 168
 169   while (1)
 170     {
 171       int val;
 172       struct corehead core_header;
 173
 174       val = bfd_bread ((void *) &core_header,
 175                       (bfd_size_type) sizeof core_header, abfd);
 176       if (val <= 0)
 177         break;
 178       switch (core_header.type)
 179         {
 180         case CORE_KERNEL:
 181         case CORE_FORMAT:
 182           /* Just skip this.  */
 183           bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
 184           good_sections++;
 185           break;
 186         case CORE_EXEC:
 187           {
 188             struct proc_exec proc_exec;
 189             if (bfd_bread ((void *) &proc_exec, (bfd_size_type) core_header.len,
 190                           abfd) != core_header.len)
 191               break;
 192             strncpy (core_command (abfd), proc_exec.cmd, MAXCOMLEN + 1);
 193             good_sections++;
 194           }
 195           break;
 196         case CORE_PROC:
 197           {
 198             struct proc_info proc_info;
 199             char  secname[100];  /* Of arbitrary size, but plenty large. */
 200
 201             /* We need to read this section, 'cause we need to determine
 202                whether the core-dumped app was threaded before we create
 203                any .reg sections. */
 204             if (bfd_bread (&proc_info, (bfd_size_type) core_header.len, abfd)
 205                 != core_header.len)
 206               break;
 207
 208               /* However, we also want to create those sections with the
 209                  file positioned at the start of the record, it seems. */
 210             if (bfd_seek (abfd, (file_ptr) -core_header.len, SEEK_CUR) != 0)
 211               break;
 212
 213 #if defined(PROC_INFO_HAS_THREAD_ID)
 214             core_kernel_thread_id (abfd) = proc_info.lwpid;
 215             core_user_thread_id (abfd) = proc_info.user_tid;
 216 #else
 217             core_kernel_thread_id (abfd) = 0;
 218             core_user_thread_id (abfd) = 0;
 219 #endif
 220             /* If the program was unthreaded, then we'll just create a
 221                .reg section.
 222
 223                If the program was threaded, then we'll create .reg/XXXXX
 224                section for each thread, where XXXXX is a printable
 225                representation of the kernel thread id.  We'll also
 226                create a .reg section for the thread that was running
 227                and signalled at the time of the core-dump (i.e., this
 228                is effectively an alias, needed to keep GDB happy.)
 229
 230                Note that we use `.reg/XXXXX' as opposed to '.regXXXXX'
 231                because GDB expects that .reg2 will be the floating-
 232                point registers. */
 233             if (core_kernel_thread_id (abfd) == 0)
 234               {
 235                 if (!make_bfd_asection (abfd, ".reg",
 236                                         SEC_HAS_CONTENTS,
 237                                         core_header.len,
 238                                         (int) &proc_info - (int) & proc_info.hw_regs,
 239                                         2))
 240                   goto fail;
 241               }
 242             else
 243               {
 244                 /* There are threads.  Is this the one that caused the
 245                    core-dump?  We'll claim it was the running thread. */
 246                 if (proc_info.sig != -1)
 247                   {
 248                     if (!make_bfd_asection (abfd, ".reg",
 249                                             SEC_HAS_CONTENTS,
 250                                             core_header.len,
 251                                             (int) &proc_info - (int) & proc_info.hw_regs,
 252                                             2))
 253                       goto fail;
 254                   }
 255                 /* We always make one of these sections, for every thread. */
 256                 sprintf (secname, ".reg/%d", core_kernel_thread_id (abfd));
 257                 if (!make_bfd_asection (abfd, secname,
 258                                         SEC_HAS_CONTENTS,
 259                                         core_header.len,
 260                                         (int) &proc_info - (int) & proc_info.hw_regs,
 261                                         2))
 262                   goto fail;
 263               }
 264             core_signal (abfd) = proc_info.sig;
 265             if (bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR) != 0)
 266               break;
 267             good_sections++;
 268           }
 269           break;
 270
 271         case CORE_DATA:
 272         case CORE_STACK:
 273         case CORE_TEXT:
 274         case CORE_MMF:
 275         case CORE_SHM:
 276         case CORE_ANON_SHMEM:
 277           if (!make_bfd_asection (abfd, ".data",
 278                                   SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 279                                   core_header.len, core_header.addr, 2))
 280             goto fail;
 281
 282           bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
 283           good_sections++;
 284           break;
 285
 286         case CORE_NONE:
 287           /* Let's not punt if we encounter a section of unknown
 288              type.  Rather, let's make a note of it.  If we later
 289              see that there were also "good" sections, then we'll
 290              declare that this a core file, but we'll also warn that
 291              it may be incompatible with this gdb.
 292              */
 293           unknown_sections++;
 294           break;
 295
 296          default:
 297            goto fail; /*unrecognized core file type */
 298         }
 299     }
 300
 301   /* OK, we believe you.  You're a core file (sure, sure).  */
 302
 303   /* Were there sections of unknown type?  If so, yet there were
 304      at least some complete sections of known type, then, issue
 305      a warning.  Possibly the core file was generated on a version
 306      of HP-UX that is incompatible with that for which this gdb was
 307      built.
 308      */
 309   if ((unknown_sections > 0) && (good_sections > 0))
 310     (*_bfd_error_handler)
 311       ("%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",
 312        abfd->filename);
 313
 314   return abfd->xvec;
 315
 316  fail:
 317   bfd_release (abfd, core_hdr (abfd));
 318   core_hdr (abfd) = NULL;
 319   bfd_section_list_clear (abfd);
 320   return NULL;
 321 }
 322
 323 static char *
 324 hpux_core_core_file_failing_command (abfd)
 325      bfd *abfd;
 326 {
 327   return core_command (abfd);
 328 }
 329
 330 static int
 331 hpux_core_core_file_failing_signal (abfd)
 332      bfd *abfd;
 333 {
 334   return core_signal (abfd);
 335 }
 336
 337 static bfd_boolean
 338 hpux_core_core_file_matches_executable_p (core_bfd, exec_bfd)
 339      bfd *core_bfd ATTRIBUTE_UNUSED;
 340      bfd *exec_bfd ATTRIBUTE_UNUSED;
 341 {
 342   return TRUE;                  /* FIXME, We have no way of telling at this point */
 343 }
 344 \f
 345 /* If somebody calls any byte-swapping routines, shoot them.  */
 346 static void
 347 swap_abort ()
 348 {
 349   abort(); /* This way doesn't require any declaration for ANSI to fuck up */
 350 }
 351
 352 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
 353 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
 354 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
 355 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
 356 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
 357 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
 358
 359 const bfd_target hpux_core_vec =
 360   {
 361     "hpux-core",
 362     bfd_target_unknown_flavour,
 363     BFD_ENDIAN_BIG,             /* target byte order */
 364     BFD_ENDIAN_BIG,             /* target headers byte order */
 365     (HAS_RELOC | EXEC_P |       /* object flags */
 366      HAS_LINENO | HAS_DEBUG |
 367      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 368     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 369     0,                                                     /* symbol prefix */
 370     ' ',                                                   /* ar_pad_char */
 371     16,                                                    /* ar_max_namelen */
 372     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit data */
 373     NO_GET, NO_GETS, NO_PUT,            /* 32 bit data */
 374     NO_GET, NO_GETS, NO_PUT,            /* 16 bit data */
 375     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit hdrs */
 376     NO_GET, NO_GETS, NO_PUT,            /* 32 bit hdrs */
 377     NO_GET, NO_GETS, NO_PUT,            /* 16 bit hdrs */
 378
 379     {                           /* bfd_check_format */
 380       _bfd_dummy_target,                /* unknown format */
 381       _bfd_dummy_target,                /* object file */
 382       _bfd_dummy_target,                /* archive */
 383       hpux_core_core_file_p             /* a core file */
 384     },
 385     {                           /* bfd_set_format */
 386       bfd_false, bfd_false,
 387       bfd_false, bfd_false
 388     },
 389     {                           /* bfd_write_contents */
 390       bfd_false, bfd_false,
 391       bfd_false, bfd_false
 392     },
 393
 394     BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 395     BFD_JUMP_TABLE_COPY (_bfd_generic),
 396     BFD_JUMP_TABLE_CORE (hpux_core),
 397     BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 398     BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 399     BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 400     BFD_JUMP_TABLE_WRITE (_bfd_generic),
 401     BFD_JUMP_TABLE_LINK (_bfd_nolink),
 402     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 403
 404     NULL,
 405
 406     (PTR) 0                     /* backend_data */
 407   };