bfd/hpux-core.c

   1 /* BFD back-end for HP/UX core files.
   2    Copyright 1993, 1994, 1996, 1998, 1999, 2001, 2002, 2003, 2004, 2005, 2006,
   3    2007, 2008 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 3 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,
  22    MA 02110-1301, USA.  */
  23
  24
  25 /* This file can only be compiled on systems which use HP/UX style
  26    core files.  */
  27
  28 #include "sysdep.h"
  29 #include "bfd.h"
  30 #include "libbfd.h"
  31
  32 #if defined (HOST_HPPAHPUX) || defined (HOST_HP300HPUX) || defined (HOST_HPPAMPEIX)
  33
  34 /* FIXME: sys/core.h doesn't exist for HPUX version 7.  HPUX version
  35    5, 6, and 7 core files seem to be standard trad-core.c type core
  36    files; can we just use trad-core.c in addition to this file?  */
  37
  38 #include <sys/core.h>
  39 #include <sys/utsname.h>
  40
  41 #endif /* HOST_HPPAHPUX */
  42
  43 #ifdef HOST_HPPABSD
  44
  45 /* Not a very swift place to put it, but that's where the BSD port
  46    puts them.  */
  47 #include "/hpux/usr/include/sys/core.h"
  48
  49 #endif /* HOST_HPPABSD */
  50
  51 #include <sys/param.h>
  52 #ifdef HAVE_DIRENT_H
  53 # include <dirent.h>
  54 #else
  55 # ifdef HAVE_SYS_NDIR_H
  56 #  include <sys/ndir.h>
  57 # endif
  58 # ifdef HAVE_SYS_DIR_H
  59 #  include <sys/dir.h>
  60 # endif
  61 # ifdef HAVE_NDIR_H
  62 #  include <ndir.h>
  63 # endif
  64 #endif
  65 #include <signal.h>
  66 #ifdef HPUX_CORE
  67 #include <machine/reg.h>
  68 #endif
  69 #include <sys/file.h>
  70
  71 /* Kludge: There's no explicit mechanism provided by sys/core.h to
  72    conditionally know whether a proc_info has thread id fields.
  73    However, CORE_ANON_SHMEM shows up first at 10.30, which is
  74    happily also when meaningful thread id's show up in proc_info. */
  75 #if defined(CORE_ANON_SHMEM)
  76 #define PROC_INFO_HAS_THREAD_ID (1)
  77 #endif
  78
  79 /* This type appears at HP-UX 10.30.  Defining it if not defined
  80    by sys/core.h allows us to build for older HP-UX's, and (since
  81    it won't be encountered in core-dumps from older HP-UX's) is
  82    harmless. */
  83 #if !defined(CORE_ANON_SHMEM)
  84 #define CORE_ANON_SHMEM 0x00000200         /* anonymous shared memory */
  85 #endif
  86
  87 /* These are stored in the bfd's tdata */
  88
  89 /* .lwpid and .user_tid are only valid if PROC_INFO_HAS_THREAD_ID, else they
  90    are set to 0.  Also, until HP-UX implements MxN threads, .user_tid and
  91    .lwpid are synonymous. */
  92 struct hpux_core_struct
  93 {
  94   int sig;
  95   int lwpid;               /* Kernel thread ID. */
  96   unsigned long user_tid;  /* User thread ID. */
  97   char cmd[MAXCOMLEN + 1];
  98 };
  99
 100 #define core_hdr(bfd) ((bfd)->tdata.hpux_core_data)
 101 #define core_signal(bfd) (core_hdr(bfd)->sig)
 102 #define core_command(bfd) (core_hdr(bfd)->cmd)
 103 #define core_kernel_thread_id(bfd) (core_hdr(bfd)->lwpid)
 104 #define core_user_thread_id(bfd) (core_hdr(bfd)->user_tid)
 105 #define hpux_core_core_file_matches_executable_p generic_core_file_matches_executable_p
 106 #define hpux_core_core_file_pid _bfd_nocore_core_file_pid
 107
 108 static asection *make_bfd_asection (bfd *, const char *, flagword,
 109                                     bfd_size_type, bfd_vma, unsigned int);
 110 static const bfd_target *hpux_core_core_file_p (bfd *);
 111 static char *hpux_core_core_file_failing_command (bfd *);
 112 static int hpux_core_core_file_failing_signal (bfd *);
 113 static void swap_abort (void);
 114
 115 static asection *
 116 make_bfd_asection (bfd *abfd, const char *name, flagword flags,
 117                    bfd_size_type size, bfd_vma vma,
 118                    unsigned int alignment_power)
 119 {
 120   asection *asect;
 121   char *newname;
 122
 123   newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1);
 124   if (!newname)
 125     return NULL;
 126
 127   strcpy (newname, name);
 128
 129   asect = bfd_make_section_anyway_with_flags (abfd, newname, flags);
 130   if (!asect)
 131     return NULL;
 132
 133   asect->size = size;
 134   asect->vma = vma;
 135   asect->filepos = bfd_tell (abfd);
 136   asect->alignment_power = alignment_power;
 137
 138   return asect;
 139 }
 140
 141 /* Return true if the given core file section corresponds to a thread,
 142    based on its name.  */
 143
 144 static int
 145 thread_section_p (bfd *abfd ATTRIBUTE_UNUSED,
 146                   asection *sect,
 147                   void *obj ATTRIBUTE_UNUSED)
 148 {
 149   return CONST_STRNEQ (sect->name, ".reg/");
 150 }
 151
 152 /* this function builds a bfd target if the file is a corefile.
 153    It returns null or 0 if it finds out thaat it is not a core file.
 154    The way it checks this is by looking for allowed 'type' field values.
 155    These are declared in sys/core.h
 156    There are some values which are 'reserved for future use'. In particular
 157    CORE_NONE is actually defined as 0. This may be a catch-all for cases
 158    in which the core file is generated by some non-hpux application.
 159    (I am just guessing here!)
 160 */
 161 static const bfd_target *
 162 hpux_core_core_file_p (bfd *abfd)
 163 {
 164   int  good_sections = 0;
 165   int  unknown_sections = 0;
 166
 167   core_hdr (abfd) = (struct hpux_core_struct *)
 168     bfd_zalloc (abfd, (bfd_size_type) sizeof (struct hpux_core_struct));
 169   if (!core_hdr (abfd))
 170     return NULL;
 171
 172   while (1)
 173     {
 174       int val;
 175       struct corehead core_header;
 176
 177       val = bfd_bread ((void *) &core_header,
 178                       (bfd_size_type) sizeof core_header, abfd);
 179       if (val <= 0)
 180         break;
 181       switch (core_header.type)
 182         {
 183         case CORE_KERNEL:
 184         case CORE_FORMAT:
 185           /* Just skip this.  */
 186           bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
 187           good_sections++;
 188           break;
 189         case CORE_EXEC:
 190           {
 191             struct proc_exec proc_exec;
 192             if (bfd_bread ((void *) &proc_exec, (bfd_size_type) core_header.len,
 193                           abfd) != core_header.len)
 194               break;
 195             strncpy (core_command (abfd), proc_exec.cmd, MAXCOMLEN + 1);
 196             good_sections++;
 197           }
 198           break;
 199         case CORE_PROC:
 200           {
 201             struct proc_info proc_info;
 202             char  secname[100];  /* Of arbitrary size, but plenty large. */
 203
 204             /* We need to read this section, 'cause we need to determine
 205                whether the core-dumped app was threaded before we create
 206                any .reg sections. */
 207             if (bfd_bread (&proc_info, (bfd_size_type) core_header.len, abfd)
 208                 != core_header.len)
 209               break;
 210
 211               /* However, we also want to create those sections with the
 212                  file positioned at the start of the record, it seems. */
 213             if (bfd_seek (abfd, -((file_ptr) core_header.len), SEEK_CUR) != 0)
 214               break;
 215
 216 #if defined(PROC_INFO_HAS_THREAD_ID)
 217             core_kernel_thread_id (abfd) = proc_info.lwpid;
 218             core_user_thread_id (abfd) = proc_info.user_tid;
 219 #else
 220             core_kernel_thread_id (abfd) = 0;
 221             core_user_thread_id (abfd) = 0;
 222 #endif
 223             /* If the program was unthreaded, then we'll just create a
 224                .reg section.
 225
 226                If the program was threaded, then we'll create .reg/XXXXX
 227                section for each thread, where XXXXX is a printable
 228                representation of the kernel thread id.  We'll also
 229                create a .reg section for the thread that was running
 230                and signalled at the time of the core-dump (i.e., this
 231                is effectively an alias, needed to keep GDB happy.)
 232
 233                Note that we use `.reg/XXXXX' as opposed to '.regXXXXX'
 234                because GDB expects that .reg2 will be the floating-
 235                point registers. */
 236             if (core_kernel_thread_id (abfd) == 0)
 237               {
 238                 if (!make_bfd_asection (abfd, ".reg",
 239                                         SEC_HAS_CONTENTS,
 240                                         core_header.len,
 241                                         (bfd_vma) offsetof (struct proc_info,
 242                                                             hw_regs),
 243                                         2))
 244                   goto fail;
 245               }
 246             else
 247               {
 248                 /* There are threads.  Is this the one that caused the
 249                    core-dump?  We'll claim it was the running thread. */
 250                 if (proc_info.sig != -1)
 251                   {
 252                     if (!make_bfd_asection (abfd, ".reg",
 253                                             SEC_HAS_CONTENTS,
 254                                             core_header.len,
 255                                             (bfd_vma)offsetof (struct proc_info,
 256                                                                hw_regs),
 257                                             2))
 258                       goto fail;
 259                   }
 260                 /* We always make one of these sections, for every thread. */
 261                 sprintf (secname, ".reg/%d", core_kernel_thread_id (abfd));
 262                 if (!make_bfd_asection (abfd, secname,
 263                                         SEC_HAS_CONTENTS,
 264                                         core_header.len,
 265                                         (bfd_vma) offsetof (struct proc_info,
 266                                                             hw_regs),
 267                                         2))
 268                   goto fail;
 269               }
 270             core_signal (abfd) = proc_info.sig;
 271             if (bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR) != 0)
 272               break;
 273             good_sections++;
 274           }
 275           break;
 276
 277         case CORE_DATA:
 278         case CORE_STACK:
 279         case CORE_TEXT:
 280         case CORE_MMF:
 281         case CORE_SHM:
 282         case CORE_ANON_SHMEM:
 283           if (!make_bfd_asection (abfd, ".data",
 284                                   SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 285                                   core_header.len,
 286                                   (bfd_vma) core_header.addr, 2))
 287             goto fail;
 288
 289           bfd_seek (abfd, (file_ptr) core_header.len, SEEK_CUR);
 290           good_sections++;
 291           break;
 292
 293         case CORE_NONE:
 294           /* Let's not punt if we encounter a section of unknown
 295              type.  Rather, let's make a note of it.  If we later
 296              see that there were also "good" sections, then we'll
 297              declare that this a core file, but we'll also warn that
 298              it may be incompatible with this gdb.
 299              */
 300           unknown_sections++;
 301           break;
 302
 303          default:
 304            goto fail; /*unrecognized core file type */
 305         }
 306     }
 307
 308   /* OK, we believe you.  You're a core file (sure, sure).  */
 309
 310   /* On HP/UX, we sometimes encounter core files where none of the threads
 311      was found to be the running thread (ie the signal was set to -1 for
 312      all threads).  This happens when the program was aborted externally
 313      via a TT_CORE ttrace system call.  In that case, we just pick one
 314      thread at random to be the active thread.  */
 315   if (core_kernel_thread_id (abfd) != 0
 316       && bfd_get_section_by_name (abfd, ".reg") == NULL)
 317     {
 318       asection *asect = bfd_sections_find_if (abfd, thread_section_p, NULL);
 319       asection *reg_sect;
 320
 321       if (asect != NULL)
 322         {
 323           reg_sect = make_bfd_asection (abfd, ".reg", asect->flags,
 324                                         asect->size, asect->vma,
 325                                         asect->alignment_power);
 326           if (reg_sect == NULL)
 327             goto fail;
 328
 329           reg_sect->filepos = asect->filepos;
 330         }
 331     }
 332
 333   /* Were there sections of unknown type?  If so, yet there were
 334      at least some complete sections of known type, then, issue
 335      a warning.  Possibly the core file was generated on a version
 336      of HP-UX that is incompatible with that for which this gdb was
 337      built.
 338      */
 339   if ((unknown_sections > 0) && (good_sections > 0))
 340     (*_bfd_error_handler)
 341       ("%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",
 342        abfd->filename);
 343
 344   return abfd->xvec;
 345
 346  fail:
 347   bfd_release (abfd, core_hdr (abfd));
 348   core_hdr (abfd) = NULL;
 349   bfd_section_list_clear (abfd);
 350   return NULL;
 351 }
 352
 353 static char *
 354 hpux_core_core_file_failing_command (bfd *abfd)
 355 {
 356   return core_command (abfd);
 357 }
 358
 359 static int
 360 hpux_core_core_file_failing_signal (bfd *abfd)
 361 {
 362   return core_signal (abfd);
 363 }
 364
 365 \f
 366 /* If somebody calls any byte-swapping routines, shoot them.  */
 367 static void
 368 swap_abort (void)
 369 {
 370   abort(); /* This way doesn't require any declaration for ANSI to fuck up */
 371 }
 372
 373 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
 374 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
 375 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
 376 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
 377 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
 378 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
 379
 380 const bfd_target hpux_core_vec =
 381   {
 382     "hpux-core",
 383     bfd_target_unknown_flavour,
 384     BFD_ENDIAN_BIG,             /* target byte order */
 385     BFD_ENDIAN_BIG,             /* target headers byte order */
 386     (HAS_RELOC | EXEC_P |       /* object flags */
 387      HAS_LINENO | HAS_DEBUG |
 388      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 389     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 390     0,                                                     /* symbol prefix */
 391     ' ',                                                   /* ar_pad_char */
 392     16,                                                    /* ar_max_namelen */
 393     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit data */
 394     NO_GET, NO_GETS, NO_PUT,            /* 32 bit data */
 395     NO_GET, NO_GETS, NO_PUT,            /* 16 bit data */
 396     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit hdrs */
 397     NO_GET, NO_GETS, NO_PUT,            /* 32 bit hdrs */
 398     NO_GET, NO_GETS, NO_PUT,            /* 16 bit hdrs */
 399
 400     {                           /* bfd_check_format */
 401       _bfd_dummy_target,                /* unknown format */
 402       _bfd_dummy_target,                /* object file */
 403       _bfd_dummy_target,                /* archive */
 404       hpux_core_core_file_p             /* a core file */
 405     },
 406     {                           /* bfd_set_format */
 407       bfd_false, bfd_false,
 408       bfd_false, bfd_false
 409     },
 410     {                           /* bfd_write_contents */
 411       bfd_false, bfd_false,
 412       bfd_false, bfd_false
 413     },
 414
 415     BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 416     BFD_JUMP_TABLE_COPY (_bfd_generic),
 417     BFD_JUMP_TABLE_CORE (hpux_core),
 418     BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 419     BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 420     BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 421     BFD_JUMP_TABLE_WRITE (_bfd_generic),
 422     BFD_JUMP_TABLE_LINK (_bfd_nolink),
 423     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 424
 425     NULL,
 426
 427     (PTR) 0                     /* backend_data */
 428   };