bfd/hpux-core.c

   1 /* BFD back-end for HP/UX core files.
   2    Copyright 1993, 94, 95, 96, 97, 1998 Free Software Foundation, Inc.
   3    Written by Stu Grossman, Cygnus Support.
   4    Converted to back-end form by Ian Lance Taylor, Cygnus SUpport
   5
   6 This file is part of BFD, the Binary File Descriptor library.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; if not, write to the Free Software
  20 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  21
  22 /* This file can only be compiled on systems which use HP/UX style
  23    core files.  */
  24
  25 #include "bfd.h"
  26 #include "sysdep.h"
  27 #include "libbfd.h"
  28
  29 #if defined (HOST_HPPAHPUX) || defined (HOST_HP300HPUX) || defined (HOST_HPPAMPEIX)
  30
  31 /* FIXME: sys/core.h doesn't exist for HPUX version 7.  HPUX version
  32    5, 6, and 7 core files seem to be standard trad-core.c type core
  33    files; can we just use trad-core.c in addition to this file?  */
  34
  35 #include <sys/core.h>
  36 #include <sys/utsname.h>
  37
  38 #endif /* HOST_HPPAHPUX */
  39
  40 #ifdef HOST_HPPABSD
  41
  42 /* Not a very swift place to put it, but that's where the BSD port
  43    puts them.  */
  44 #include "/hpux/usr/include/sys/core.h"
  45
  46 #endif /* HOST_HPPABSD */
  47
  48 #include <sys/param.h>
  49 #ifdef HAVE_DIRENT_H
  50 # include <dirent.h>
  51 #else
  52 # ifdef HAVE_SYS_NDIR_H
  53 #  include <sys/ndir.h>
  54 # endif
  55 # ifdef HAVE_SYS_DIR_H
  56 #  include <sys/dir.h>
  57 # endif
  58 # ifdef HAVE_NDIR_H
  59 #  include <ndir.h>
  60 # endif
  61 #endif
  62 #include <signal.h>
  63 #include <machine/reg.h>
  64 #include <sys/user.h>           /* After a.out.h  */
  65 #include <sys/file.h>
  66
  67 /* Kludge: There's no explicit mechanism provided by sys/core.h to
  68    conditionally know whether a proc_info has thread id fields.
  69    However, CORE_ANON_SHMEM shows up first at 10.30, which is
  70    happily also when meaningful thread id's show up in proc_info. */
  71 #if defined(CORE_ANON_SHMEM)
  72 #define PROC_INFO_HAS_THREAD_ID (1)
  73 #endif
  74
  75 /* This type appears at HP-UX 10.30.  Defining it if not defined
  76    by sys/core.h allows us to build for older HP-UX's, and (since
  77    it won't be encountered in core-dumps from older HP-UX's) is
  78    harmless. */
  79 #if !defined(CORE_ANON_SHMEM)
  80 #define CORE_ANON_SHMEM 0x00000200         /* anonymous shared memory */
  81 #endif
  82
  83 /* These are stored in the bfd's tdata */
  84
  85 /* .lwpid and .user_tid are only valid if PROC_INFO_HAS_THREAD_ID, else they
  86    are set to 0.  Also, until HP-UX implements MxN threads, .user_tid and
  87    .lwpid are synonymous. */
  88 struct hpux_core_struct
  89 {
  90   int sig;
  91   int lwpid;               /* Kernel thread ID. */
  92   unsigned long user_tid;  /* User thread ID. */
  93   char cmd[MAXCOMLEN + 1];
  94 };
  95
  96 #define core_hdr(bfd) ((bfd)->tdata.hpux_core_data)
  97 #define core_signal(bfd) (core_hdr(bfd)->sig)
  98 #define core_command(bfd) (core_hdr(bfd)->cmd)
  99 #define core_kernel_thread_id(bfd) (core_hdr(bfd)->lwpid)
 100 #define core_user_thread_id(bfd) (core_hdr(bfd)->user_tid)
 101
 102 static void swap_abort PARAMS ((void));
 103
 104 static asection *
 105 make_bfd_asection (abfd, name, flags, _raw_size, vma, alignment_power)
 106      bfd *abfd;
 107      CONST char *name;
 108      flagword flags;
 109      bfd_size_type _raw_size;
 110      bfd_vma vma;
 111      unsigned int alignment_power;
 112 {
 113   asection *asect;
 114   char *newname;
 115
 116   newname = bfd_alloc (abfd, strlen (name) + 1);
 117   if (!newname)
 118     return NULL;
 119
 120   strcpy (newname, name);
 121
 122   asect = bfd_make_section_anyway (abfd, newname);
 123   if (!asect)
 124     return NULL;
 125
 126   asect->flags = flags;
 127   asect->_raw_size = _raw_size;
 128   asect->vma = vma;
 129   asect->filepos = bfd_tell (abfd);
 130   asect->alignment_power = alignment_power;
 131
 132   return asect;
 133 }
 134
 135 static asymbol *
 136 hpux_core_make_empty_symbol (abfd)
 137      bfd *abfd;
 138 {
 139   asymbol *new = (asymbol *) bfd_zalloc (abfd, sizeof (asymbol));
 140   if (new)
 141     new->the_bfd = abfd;
 142   return new;
 143 }
 144
 145
 146 /* this function builds a bfd target if the file is a corefile.
 147    It returns null or 0 if it finds out thaat it is not a core file.
 148    The way it checks this is by looking for allowed 'type' field values.
 149    These are declared in sys/core.h
 150    There are some values which are 'reserved for future use'. In particular
 151    CORE_NONE is actually defined as 0. This may be a catch-all for cases
 152    in which the core file is generated by some non-hpux application.
 153    (I am just guessing here!)
 154 */
 155 static const bfd_target *
 156 hpux_core_core_file_p (abfd)
 157      bfd *abfd;
 158 {
 159   int  good_sections = 0;
 160   int  unknown_sections = 0;
 161
 162   core_hdr (abfd) = (struct hpux_core_struct *)
 163     bfd_zalloc (abfd, sizeof (struct hpux_core_struct));
 164   if (!core_hdr (abfd))
 165     return NULL;
 166
 167   while (1)
 168     {
 169       int val;
 170       struct corehead core_header;
 171
 172       val = bfd_read ((void *) &core_header, 1, sizeof core_header, abfd);
 173       if (val <= 0)
 174         break;
 175       switch (core_header.type)
 176         {
 177         case CORE_KERNEL:
 178         case CORE_FORMAT:
 179           bfd_seek (abfd, core_header.len, SEEK_CUR);   /* Just skip this */
 180           good_sections++;
 181           break;
 182         case CORE_EXEC:
 183           {
 184             struct proc_exec proc_exec;
 185             if (bfd_read ((void *) &proc_exec, 1, core_header.len, abfd)
 186                 != 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_read (&proc_info, 1, 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, -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                   return NULL;
 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                       return NULL;
 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                   return NULL;
 259               }
 260             core_signal (abfd) = proc_info.sig;
 261             if (bfd_seek (abfd, 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             return NULL;
 277
 278           bfd_seek (abfd, 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: return 0; /*unrecognized core file type */
 293         }
 294     }
 295
 296   /* OK, we believe you.  You're a core file (sure, sure).  */
 297
 298   /* Were there sections of unknown type?  If so, yet there were
 299      at least some complete sections of known type, then, issue
 300      a warning.  Possibly the core file was generated on a version
 301      of HP-UX that is incompatible with that for which this gdb was
 302      built.
 303      */
 304   if ((unknown_sections > 0) && (good_sections > 0))
 305     (*_bfd_error_handler)
 306       ("%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",
 307        abfd->filename);
 308
 309   return abfd->xvec;
 310 }
 311
 312 static char *
 313 hpux_core_core_file_failing_command (abfd)
 314      bfd *abfd;
 315 {
 316   return core_command (abfd);
 317 }
 318
 319 /* ARGSUSED */
 320 static int
 321 hpux_core_core_file_failing_signal (abfd)
 322      bfd *abfd;
 323 {
 324   return core_signal (abfd);
 325 }
 326
 327 /* ARGSUSED */
 328 static boolean
 329 hpux_core_core_file_matches_executable_p (core_bfd, exec_bfd)
 330      bfd *core_bfd, *exec_bfd;
 331 {
 332   return true;                  /* FIXME, We have no way of telling at this point */
 333 }
 334 \f
 335 #define hpux_core_get_symtab_upper_bound _bfd_nosymbols_get_symtab_upper_bound
 336 #define hpux_core_get_symtab _bfd_nosymbols_get_symtab
 337 #define hpux_core_print_symbol _bfd_nosymbols_print_symbol
 338 #define hpux_core_get_symbol_info _bfd_nosymbols_get_symbol_info
 339 #define hpux_core_bfd_is_local_label_name \
 340   _bfd_nosymbols_bfd_is_local_label_name
 341 #define hpux_core_get_lineno _bfd_nosymbols_get_lineno
 342 #define hpux_core_find_nearest_line _bfd_nosymbols_find_nearest_line
 343 #define hpux_core_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
 344 #define hpux_core_read_minisymbols _bfd_nosymbols_read_minisymbols
 345 #define hpux_core_minisymbol_to_symbol _bfd_nosymbols_minisymbol_to_symbol
 346
 347 /* If somebody calls any byte-swapping routines, shoot them.  */
 348 static void
 349 swap_abort()
 350 {
 351   abort(); /* This way doesn't require any declaration for ANSI to fuck up */
 352 }
 353 #define NO_GET  ((bfd_vma (*) PARAMS ((   const bfd_byte *))) swap_abort )
 354 #define NO_PUT  ((void    (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort )
 355 #define NO_SIGNED_GET \
 356   ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort )
 357
 358 const bfd_target hpux_core_vec =
 359   {
 360     "hpux-core",
 361     bfd_target_unknown_flavour,
 362     BFD_ENDIAN_BIG,             /* target byte order */
 363     BFD_ENDIAN_BIG,             /* target headers byte order */
 364     (HAS_RELOC | EXEC_P |       /* object flags */
 365      HAS_LINENO | HAS_DEBUG |
 366      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 367     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 368     0,                                                     /* symbol prefix */
 369     ' ',                                                   /* ar_pad_char */
 370     16,                                                    /* ar_max_namelen */
 371     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit data */
 372     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit data */
 373     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit data */
 374     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit hdrs */
 375     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit hdrs */
 376     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit hdrs */
 377
 378     {                           /* bfd_check_format */
 379      _bfd_dummy_target,         /* unknown format */
 380      _bfd_dummy_target,         /* object file */
 381      _bfd_dummy_target,         /* archive */
 382      hpux_core_core_file_p      /* a core file */
 383     },
 384     {                           /* bfd_set_format */
 385      bfd_false, bfd_false,
 386      bfd_false, bfd_false
 387     },
 388     {                           /* bfd_write_contents */
 389      bfd_false, bfd_false,
 390      bfd_false, bfd_false
 391     },
 392
 393        BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 394        BFD_JUMP_TABLE_COPY (_bfd_generic),
 395        BFD_JUMP_TABLE_CORE (hpux_core),
 396        BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 397        BFD_JUMP_TABLE_SYMBOLS (hpux_core),
 398        BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 399        BFD_JUMP_TABLE_WRITE (_bfd_generic),
 400        BFD_JUMP_TABLE_LINK (_bfd_nolink),
 401        BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 402
 403     (PTR) 0                     /* backend_data */
 404 };