bfd/hpux-core.c

   1 /* BFD back-end for HP/UX core files.
   2    Copyright 1993, 1994, 1996, 1998, 1999, 2001, 2002
   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 PARAMS ((bfd *));
 107 static char *hpux_core_core_file_failing_command PARAMS ((bfd *));
 108 static int hpux_core_core_file_failing_signal PARAMS ((bfd *));
 109 static boolean hpux_core_core_file_matches_executable_p
 110   PARAMS ((bfd *, bfd *));
 111 static void swap_abort PARAMS ((void));
 112
 113 static asection *
 114 make_bfd_asection (abfd, name, flags, _raw_size, vma, alignment_power)
 115      bfd *abfd;
 116      const char *name;
 117      flagword flags;
 118      bfd_size_type _raw_size;
 119      bfd_vma vma;
 120      unsigned int alignment_power;
 121 {
 122   asection *asect;
 123   char *newname;
 124
 125   newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1);
 126   if (!newname)
 127     return NULL;
 128
 129   strcpy (newname, name);
 130
 131   asect = bfd_make_section_anyway (abfd, newname);
 132   if (!asect)
 133     return NULL;
 134
 135   asect->flags = flags;
 136   asect->_raw_size = _raw_size;
 137   asect->vma = vma;
 138   asect->filepos = bfd_tell (abfd);
 139   asect->alignment_power = alignment_power;
 140
 141   return asect;
 142 }
 143
 144 /* this function builds a bfd target if the file is a corefile.
 145    It returns null or 0 if it finds out thaat it is not a core file.
 146    The way it checks this is by looking for allowed 'type' field values.
 147    These are declared in sys/core.h
 148    There are some values which are 'reserved for future use'. In particular
 149    CORE_NONE is actually defined as 0. This may be a catch-all for cases
 150    in which the core file is generated by some non-hpux application.
 151    (I am just guessing here!)
 152 */
 153 static const bfd_target *
 154 hpux_core_core_file_p (abfd)
 155      bfd *abfd;
 156 {
 157   int  good_sections = 0;
 158   int  unknown_sections = 0;
 159
 160   core_hdr (abfd) = (struct hpux_core_struct *)
 161     bfd_zalloc (abfd, (bfd_size_type) sizeof (struct hpux_core_struct));
 162   if (!core_hdr (abfd))
 163     return NULL;
 164
 165   while (1)
 166     {
 167       int val;
 168       struct corehead core_header;
 169
 170       val = bfd_bread ((void *) &core_header,
 171                       (bfd_size_type) sizeof core_header, abfd);
 172       if (val <= 0)
 173         break;
 174       switch (core_header.type)
 175         {
 176         case CORE_KERNEL:
 177         case CORE_FORMAT:
 178           /* Just skip this.  */
 179           bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
 180           good_sections++;
 181           break;
 182         case CORE_EXEC:
 183           {
 184             struct proc_exec proc_exec;
 185             if (bfd_bread ((void *) &proc_exec, (bfd_size_type) core_header.len,
 186                           abfd) != core_header.len)
 187               break;
 188             strncpy (core_command (abfd), proc_exec.cmd, MAXCOMLEN + 1);
 189             good_sections++;
 190           }
 191           break;
 192         case CORE_PROC:
 193           {
 194             struct proc_info proc_info;
 195             char  secname[100];  /* Of arbitrary size, but plenty large. */
 196
 197             /* We need to read this section, 'cause we need to determine
 198                whether the core-dumped app was threaded before we create
 199                any .reg sections. */
 200             if (bfd_bread (&proc_info, (bfd_size_type) core_header.len, abfd)
 201                 != core_header.len)
 202               break;
 203
 204               /* However, we also want to create those sections with the
 205                  file positioned at the start of the record, it seems. */
 206             if (bfd_seek (abfd, (file_ptr) -core_header.len, SEEK_CUR) != 0)
 207               break;
 208
 209 #if defined(PROC_INFO_HAS_THREAD_ID)
 210             core_kernel_thread_id (abfd) = proc_info.lwpid;
 211             core_user_thread_id (abfd) = proc_info.user_tid;
 212 #else
 213             core_kernel_thread_id (abfd) = 0;
 214             core_user_thread_id (abfd) = 0;
 215 #endif
 216             /* If the program was unthreaded, then we'll just create a
 217                .reg section.
 218
 219                If the program was threaded, then we'll create .reg/XXXXX
 220                section for each thread, where XXXXX is a printable
 221                representation of the kernel thread id.  We'll also
 222                create a .reg section for the thread that was running
 223                and signalled at the time of the core-dump (i.e., this
 224                is effectively an alias, needed to keep GDB happy.)
 225
 226                Note that we use `.reg/XXXXX' as opposed to '.regXXXXX'
 227                because GDB expects that .reg2 will be the floating-
 228                point registers. */
 229             if (core_kernel_thread_id (abfd) == 0)
 230               {
 231                 if (!make_bfd_asection (abfd, ".reg",
 232                                         SEC_HAS_CONTENTS,
 233                                         core_header.len,
 234                                         (int) &proc_info - (int) & proc_info.hw_regs,
 235                                         2))
 236                   goto fail;
 237               }
 238             else
 239               {
 240                 /* There are threads.  Is this the one that caused the
 241                    core-dump?  We'll claim it was the running thread. */
 242                 if (proc_info.sig != -1)
 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                       goto fail;
 250                   }
 251                 /* We always make one of these sections, for every thread. */
 252                 sprintf (secname, ".reg/%d", core_kernel_thread_id (abfd));
 253                 if (!make_bfd_asection (abfd, secname,
 254                                         SEC_HAS_CONTENTS,
 255                                         core_header.len,
 256                                         (int) &proc_info - (int) & proc_info.hw_regs,
 257                                         2))
 258                   goto fail;
 259               }
 260             core_signal (abfd) = proc_info.sig;
 261             if (bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR) != 0)
 262               break;
 263             good_sections++;
 264           }
 265           break;
 266
 267         case CORE_DATA:
 268         case CORE_STACK:
 269         case CORE_TEXT:
 270         case CORE_MMF:
 271         case CORE_SHM:
 272         case CORE_ANON_SHMEM:
 273           if (!make_bfd_asection (abfd, ".data",
 274                                   SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 275                                   core_header.len, core_header.addr, 2))
 276             goto fail;
 277
 278           bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
 279           good_sections++;
 280           break;
 281
 282         case CORE_NONE:
 283           /* Let's not punt if we encounter a section of unknown
 284              type.  Rather, let's make a note of it.  If we later
 285              see that there were also "good" sections, then we'll
 286              declare that this a core file, but we'll also warn that
 287              it may be incompatible with this gdb.
 288              */
 289           unknown_sections++;
 290           break;
 291
 292          default:
 293            goto fail; /*unrecognized core file type */
 294         }
 295     }
 296
 297   /* OK, we believe you.  You're a core file (sure, sure).  */
 298
 299   /* Were there sections of unknown type?  If so, yet there were
 300      at least some complete sections of known type, then, issue
 301      a warning.  Possibly the core file was generated on a version
 302      of HP-UX that is incompatible with that for which this gdb was
 303      built.
 304      */
 305   if ((unknown_sections > 0) && (good_sections > 0))
 306     (*_bfd_error_handler)
 307       ("%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",
 308        abfd->filename);
 309
 310   return abfd->xvec;
 311
 312  fail:
 313   bfd_release (abfd, core_hdr (abfd));
 314   core_hdr (abfd) = NULL;
 315   bfd_section_list_clear (abfd);
 316   return NULL;
 317 }
 318
 319 static char *
 320 hpux_core_core_file_failing_command (abfd)
 321      bfd *abfd;
 322 {
 323   return core_command (abfd);
 324 }
 325
 326 /* ARGSUSED */
 327 static int
 328 hpux_core_core_file_failing_signal (abfd)
 329      bfd *abfd;
 330 {
 331   return core_signal (abfd);
 332 }
 333
 334 /* ARGSUSED */
 335 static boolean
 336 hpux_core_core_file_matches_executable_p (core_bfd, exec_bfd)
 337      bfd *core_bfd ATTRIBUTE_UNUSED;
 338      bfd *exec_bfd ATTRIBUTE_UNUSED;
 339 {
 340   return true;                  /* FIXME, We have no way of telling at this point */
 341 }
 342 \f
 343 /* If somebody calls any byte-swapping routines, shoot them.  */
 344 static void
 345 swap_abort ()
 346 {
 347   abort(); /* This way doesn't require any declaration for ANSI to fuck up */
 348 }
 349 #define NO_GET  ((bfd_vma (*) PARAMS ((   const bfd_byte *))) swap_abort )
 350 #define NO_PUT  ((void    (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort )
 351 #define NO_SIGNED_GET \
 352   ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort )
 353
 354 const bfd_target hpux_core_vec =
 355   {
 356     "hpux-core",
 357     bfd_target_unknown_flavour,
 358     BFD_ENDIAN_BIG,             /* target byte order */
 359     BFD_ENDIAN_BIG,             /* target headers byte order */
 360     (HAS_RELOC | EXEC_P |       /* object flags */
 361      HAS_LINENO | HAS_DEBUG |
 362      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 363     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 364     0,                                                     /* symbol prefix */
 365     ' ',                                                   /* ar_pad_char */
 366     16,                                                    /* ar_max_namelen */
 367     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit data */
 368     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit data */
 369     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit data */
 370     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit hdrs */
 371     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit hdrs */
 372     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit hdrs */
 373
 374     {                           /* bfd_check_format */
 375      _bfd_dummy_target,         /* unknown format */
 376      _bfd_dummy_target,         /* object file */
 377      _bfd_dummy_target,         /* archive */
 378      hpux_core_core_file_p      /* a core file */
 379     },
 380     {                           /* bfd_set_format */
 381      bfd_false, bfd_false,
 382      bfd_false, bfd_false
 383     },
 384     {                           /* bfd_write_contents */
 385      bfd_false, bfd_false,
 386      bfd_false, bfd_false
 387     },
 388
 389     BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 390     BFD_JUMP_TABLE_COPY (_bfd_generic),
 391     BFD_JUMP_TABLE_CORE (hpux_core),
 392     BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 393     BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 394     BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 395     BFD_JUMP_TABLE_WRITE (_bfd_generic),
 396     BFD_JUMP_TABLE_LINK (_bfd_nolink),
 397     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 398
 399     NULL,
 400
 401     (PTR) 0                     /* backend_data */
 402 };