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