bfd/hpux-core.c

   1 /* BFD back-end for HP/UX core files.
   2    Copyright 1993, 1994, 1996, 1998, 1999, 2001, 2002, 2003, 2004, 2006
   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 #define hpux_core_core_file_matches_executable_p generic_core_file_matches_executable_p
 105
 106 static asection *make_bfd_asection (bfd *, const char *, flagword,
 107                                     bfd_size_type, bfd_vma, unsigned int);
 108 static const bfd_target *hpux_core_core_file_p (bfd *);
 109 static char *hpux_core_core_file_failing_command (bfd *);
 110 static int hpux_core_core_file_failing_signal (bfd *);
 111 static void swap_abort (void);
 112
 113 static asection *
 114 make_bfd_asection (bfd *abfd, const char *name, flagword flags,
 115                    bfd_size_type size, bfd_vma vma,
 116                    unsigned int alignment_power)
 117 {
 118   asection *asect;
 119   char *newname;
 120
 121   newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1);
 122   if (!newname)
 123     return NULL;
 124
 125   strcpy (newname, name);
 126
 127   asect = bfd_make_section_anyway_with_flags (abfd, newname, flags);
 128   if (!asect)
 129     return NULL;
 130
 131   asect->size = size;
 132   asect->vma = vma;
 133   asect->filepos = bfd_tell (abfd);
 134   asect->alignment_power = alignment_power;
 135
 136   return asect;
 137 }
 138
 139 /* Return true if the given core file section corresponds to a thread,
 140    based on its name.  */
 141
 142 static int
 143 thread_section_p (bfd *abfd ATTRIBUTE_UNUSED,
 144                   asection *sect,
 145                   void *obj ATTRIBUTE_UNUSED)
 146 {
 147   return (strncmp (sect->name, ".reg/", 5) == 0);
 148 }
 149
 150 /* this function builds a bfd target if the file is a corefile.
 151    It returns null or 0 if it finds out thaat it is not a core file.
 152    The way it checks this is by looking for allowed 'type' field values.
 153    These are declared in sys/core.h
 154    There are some values which are 'reserved for future use'. In particular
 155    CORE_NONE is actually defined as 0. This may be a catch-all for cases
 156    in which the core file is generated by some non-hpux application.
 157    (I am just guessing here!)
 158 */
 159 static const bfd_target *
 160 hpux_core_core_file_p (bfd *abfd)
 161 {
 162   int  good_sections = 0;
 163   int  unknown_sections = 0;
 164
 165   core_hdr (abfd) = (struct hpux_core_struct *)
 166     bfd_zalloc (abfd, (bfd_size_type) sizeof (struct hpux_core_struct));
 167   if (!core_hdr (abfd))
 168     return NULL;
 169
 170   while (1)
 171     {
 172       int val;
 173       struct corehead core_header;
 174
 175       val = bfd_bread ((void *) &core_header,
 176                       (bfd_size_type) sizeof core_header, abfd);
 177       if (val <= 0)
 178         break;
 179       switch (core_header.type)
 180         {
 181         case CORE_KERNEL:
 182         case CORE_FORMAT:
 183           /* Just skip this.  */
 184           bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
 185           good_sections++;
 186           break;
 187         case CORE_EXEC:
 188           {
 189             struct proc_exec proc_exec;
 190             if (bfd_bread ((void *) &proc_exec, (bfd_size_type) core_header.len,
 191                           abfd) != core_header.len)
 192               break;
 193             strncpy (core_command (abfd), proc_exec.cmd, MAXCOMLEN + 1);
 194             good_sections++;
 195           }
 196           break;
 197         case CORE_PROC:
 198           {
 199             struct proc_info proc_info;
 200             char  secname[100];  /* Of arbitrary size, but plenty large. */
 201
 202             /* We need to read this section, 'cause we need to determine
 203                whether the core-dumped app was threaded before we create
 204                any .reg sections. */
 205             if (bfd_bread (&proc_info, (bfd_size_type) core_header.len, abfd)
 206                 != core_header.len)
 207               break;
 208
 209               /* However, we also want to create those sections with the
 210                  file positioned at the start of the record, it seems. */
 211             if (bfd_seek (abfd, -((file_ptr) core_header.len), SEEK_CUR) != 0)
 212               break;
 213
 214 #if defined(PROC_INFO_HAS_THREAD_ID)
 215             core_kernel_thread_id (abfd) = proc_info.lwpid;
 216             core_user_thread_id (abfd) = proc_info.user_tid;
 217 #else
 218             core_kernel_thread_id (abfd) = 0;
 219             core_user_thread_id (abfd) = 0;
 220 #endif
 221             /* If the program was unthreaded, then we'll just create a
 222                .reg section.
 223
 224                If the program was threaded, then we'll create .reg/XXXXX
 225                section for each thread, where XXXXX is a printable
 226                representation of the kernel thread id.  We'll also
 227                create a .reg section for the thread that was running
 228                and signalled at the time of the core-dump (i.e., this
 229                is effectively an alias, needed to keep GDB happy.)
 230
 231                Note that we use `.reg/XXXXX' as opposed to '.regXXXXX'
 232                because GDB expects that .reg2 will be the floating-
 233                point registers. */
 234             if (core_kernel_thread_id (abfd) == 0)
 235               {
 236                 if (!make_bfd_asection (abfd, ".reg",
 237                                         SEC_HAS_CONTENTS,
 238                                         core_header.len,
 239                                         (bfd_vma) offsetof (struct proc_info,
 240                                                             hw_regs),
 241                                         2))
 242                   goto fail;
 243               }
 244             else
 245               {
 246                 /* There are threads.  Is this the one that caused the
 247                    core-dump?  We'll claim it was the running thread. */
 248                 if (proc_info.sig != -1)
 249                   {
 250                     if (!make_bfd_asection (abfd, ".reg",
 251                                             SEC_HAS_CONTENTS,
 252                                             core_header.len,
 253                                             (bfd_vma)offsetof (struct proc_info,
 254                                                                hw_regs),
 255                                             2))
 256                       goto fail;
 257                   }
 258                 /* We always make one of these sections, for every thread. */
 259                 sprintf (secname, ".reg/%d", core_kernel_thread_id (abfd));
 260                 if (!make_bfd_asection (abfd, secname,
 261                                         SEC_HAS_CONTENTS,
 262                                         core_header.len,
 263                                         (bfd_vma) offsetof (struct proc_info,
 264                                                             hw_regs),
 265                                         2))
 266                   goto fail;
 267               }
 268             core_signal (abfd) = proc_info.sig;
 269             if (bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR) != 0)
 270               break;
 271             good_sections++;
 272           }
 273           break;
 274
 275         case CORE_DATA:
 276         case CORE_STACK:
 277         case CORE_TEXT:
 278         case CORE_MMF:
 279         case CORE_SHM:
 280         case CORE_ANON_SHMEM:
 281           if (!make_bfd_asection (abfd, ".data",
 282                                   SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 283                                   core_header.len,
 284                                   (bfd_vma) core_header.addr, 2))
 285             goto fail;
 286
 287           bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
 288           good_sections++;
 289           break;
 290
 291         case CORE_NONE:
 292           /* Let's not punt if we encounter a section of unknown
 293              type.  Rather, let's make a note of it.  If we later
 294              see that there were also "good" sections, then we'll
 295              declare that this a core file, but we'll also warn that
 296              it may be incompatible with this gdb.
 297              */
 298           unknown_sections++;
 299           break;
 300
 301          default:
 302            goto fail; /*unrecognized core file type */
 303         }
 304     }
 305
 306   /* OK, we believe you.  You're a core file (sure, sure).  */
 307
 308   /* On HP/UX, we sometimes encounter core files where none of the threads
 309      was found to be the running thread (ie the signal was set to -1 for
 310      all threads).  This happens when the program was aborted externally
 311      via a TT_CORE ttrace system call.  In that case, we just pick one
 312      thread at random to be the active thread.  */
 313   if (core_kernel_thread_id (abfd) != 0
 314       && bfd_get_section_by_name (abfd, ".reg") == NULL)
 315     {
 316       asection *asect = bfd_sections_find_if (abfd, thread_section_p, NULL);
 317       asection *reg_sect;
 318
 319       if (asect != NULL)
 320         {
 321           reg_sect = make_bfd_asection (abfd, ".reg", asect->flags,
 322                                         asect->size, asect->vma,
 323                                         asect->alignment_power);
 324           if (reg_sect == NULL)
 325             goto fail;
 326
 327           reg_sect->filepos = asect->filepos;
 328         }
 329     }
 330
 331   /* Were there sections of unknown type?  If so, yet there were
 332      at least some complete sections of known type, then, issue
 333      a warning.  Possibly the core file was generated on a version
 334      of HP-UX that is incompatible with that for which this gdb was
 335      built.
 336      */
 337   if ((unknown_sections > 0) && (good_sections > 0))
 338     (*_bfd_error_handler)
 339       ("%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",
 340        abfd->filename);
 341
 342   return abfd->xvec;
 343
 344  fail:
 345   bfd_release (abfd, core_hdr (abfd));
 346   core_hdr (abfd) = NULL;
 347   bfd_section_list_clear (abfd);
 348   return NULL;
 349 }
 350
 351 static char *
 352 hpux_core_core_file_failing_command (bfd *abfd)
 353 {
 354   return core_command (abfd);
 355 }
 356
 357 static int
 358 hpux_core_core_file_failing_signal (bfd *abfd)
 359 {
 360   return core_signal (abfd);
 361 }
 362
 363 \f
 364 /* If somebody calls any byte-swapping routines, shoot them.  */
 365 static void
 366 swap_abort (void)
 367 {
 368   abort(); /* This way doesn't require any declaration for ANSI to fuck up */
 369 }
 370
 371 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
 372 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
 373 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
 374 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
 375 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
 376 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
 377
 378 const bfd_target hpux_core_vec =
 379   {
 380     "hpux-core",
 381     bfd_target_unknown_flavour,
 382     BFD_ENDIAN_BIG,             /* target byte order */
 383     BFD_ENDIAN_BIG,             /* target headers byte order */
 384     (HAS_RELOC | EXEC_P |       /* object flags */
 385      HAS_LINENO | HAS_DEBUG |
 386      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 387     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 388     0,                                                     /* symbol prefix */
 389     ' ',                                                   /* ar_pad_char */
 390     16,                                                    /* ar_max_namelen */
 391     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit data */
 392     NO_GET, NO_GETS, NO_PUT,            /* 32 bit data */
 393     NO_GET, NO_GETS, NO_PUT,            /* 16 bit data */
 394     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit hdrs */
 395     NO_GET, NO_GETS, NO_PUT,            /* 32 bit hdrs */
 396     NO_GET, NO_GETS, NO_PUT,            /* 16 bit hdrs */
 397
 398     {                           /* bfd_check_format */
 399       _bfd_dummy_target,                /* unknown format */
 400       _bfd_dummy_target,                /* object file */
 401       _bfd_dummy_target,                /* archive */
 402       hpux_core_core_file_p             /* a core file */
 403     },
 404     {                           /* bfd_set_format */
 405       bfd_false, bfd_false,
 406       bfd_false, bfd_false
 407     },
 408     {                           /* bfd_write_contents */
 409       bfd_false, bfd_false,
 410       bfd_false, bfd_false
 411     },
 412
 413     BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 414     BFD_JUMP_TABLE_COPY (_bfd_generic),
 415     BFD_JUMP_TABLE_CORE (hpux_core),
 416     BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 417     BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 418     BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 419     BFD_JUMP_TABLE_WRITE (_bfd_generic),
 420     BFD_JUMP_TABLE_LINK (_bfd_nolink),
 421     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 422
 423     NULL,
 424
 425     (PTR) 0                     /* backend_data */
 426   };