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)
  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 #include <sys/dir.h>
  50 #include <signal.h>
  51 #include <machine/reg.h>
  52 #include <sys/user.h>           /* After a.out.h  */
  53 #include <sys/file.h>
  54
  55 /* Kludge: There's no explicit mechanism provided by sys/core.h to
  56    conditionally know whether a proc_info has thread id fields.
  57    However, CORE_ANON_SHMEM shows up first at 10.30, which is
  58    happily also when meaningful thread id's show up in proc_info. */
  59 #if defined(CORE_ANON_SHMEM)
  60 #define PROC_INFO_HAS_THREAD_ID (1)
  61 #endif
  62
  63 /* This type appears at HP-UX 10.30.  Defining it if not defined
  64    by sys/core.h allows us to build for older HP-UX's, and (since
  65    it won't be encountered in core-dumps from older HP-UX's) is
  66    harmless. */
  67 #if !defined(CORE_ANON_SHMEM)
  68 #define CORE_ANON_SHMEM 0x00000200         /* anonymous shared memory */
  69 #endif
  70
  71 /* These are stored in the bfd's tdata */
  72
  73 /* .lwpid and .user_tid are only valid if PROC_INFO_HAS_THREAD_ID, else they
  74    are set to 0.  Also, until HP-UX implements MxN threads, .user_tid and
  75    .lwpid are synonymous. */
  76 struct hpux_core_struct
  77 {
  78   int sig;
  79   int lwpid;               /* Kernel thread ID. */
  80   unsigned long user_tid;  /* User thread ID. */
  81   char cmd[MAXCOMLEN + 1];
  82 };
  83
  84 #define core_hdr(bfd) ((bfd)->tdata.hpux_core_data)
  85 #define core_signal(bfd) (core_hdr(bfd)->sig)
  86 #define core_command(bfd) (core_hdr(bfd)->cmd)
  87 #define core_kernel_thread_id(bfd) (core_hdr(bfd)->lwpid)
  88 #define core_user_thread_id(bfd) (core_hdr(bfd)->user_tid)
  89
  90 static void swap_abort PARAMS ((void));
  91
  92 static asection *
  93 make_bfd_asection (abfd, name, flags, _raw_size, vma, alignment_power)
  94      bfd *abfd;
  95      CONST char *name;
  96      flagword flags;
  97      bfd_size_type _raw_size;
  98      bfd_vma vma;
  99      unsigned int alignment_power;
 100 {
 101   asection *asect;
 102   char *newname;
 103
 104   newname = bfd_alloc (abfd, strlen (name) + 1);
 105   if (!newname)
 106     return NULL;
 107
 108   strcpy (newname, name);
 109
 110   asect = bfd_make_section_anyway (abfd, newname);
 111   if (!asect)
 112     return NULL;
 113
 114   asect->flags = flags;
 115   asect->_raw_size = _raw_size;
 116   asect->vma = vma;
 117   asect->filepos = bfd_tell (abfd);
 118   asect->alignment_power = alignment_power;
 119
 120   return asect;
 121 }
 122
 123 static asymbol *
 124 hpux_core_make_empty_symbol (abfd)
 125      bfd *abfd;
 126 {
 127   asymbol *new = (asymbol *) bfd_zalloc (abfd, sizeof (asymbol));
 128   if (new)
 129     new->the_bfd = abfd;
 130   return new;
 131 }
 132
 133
 134 /* this function builds a bfd target if the file is a corefile.
 135    It returns null or 0 if it finds out thaat it is not a core file.
 136    The way it checks this is by looking for allowed 'type' field values.
 137    These are declared in sys/core.h
 138    There are some values which are 'reserved for future use'. In particular
 139    CORE_NONE is actually defined as 0. This may be a catch-all for cases
 140    in which the core file is generated by some non-hpux application.
 141    (I am just guessing here!)
 142 */
 143 static const bfd_target *
 144 hpux_core_core_file_p (abfd)
 145      bfd *abfd;
 146 {
 147   int  good_sections = 0;
 148   int  unknown_sections = 0;
 149
 150   core_hdr (abfd) = (struct hpux_core_struct *)
 151     bfd_zalloc (abfd, sizeof (struct hpux_core_struct));
 152   if (!core_hdr (abfd))
 153     return NULL;
 154
 155   while (1)
 156     {
 157       int val;
 158       struct corehead core_header;
 159
 160       val = bfd_read ((void *) &core_header, 1, sizeof core_header, abfd);
 161       if (val <= 0)
 162         break;
 163       switch (core_header.type)
 164         {
 165         case CORE_KERNEL:
 166         case CORE_FORMAT:
 167           bfd_seek (abfd, core_header.len, SEEK_CUR);   /* Just skip this */
 168           good_sections++;
 169           break;
 170         case CORE_EXEC:
 171           {
 172             struct proc_exec proc_exec;
 173             if (bfd_read ((void *) &proc_exec, 1, core_header.len, abfd)
 174                 != core_header.len)
 175               break;
 176             strncpy (core_command (abfd), proc_exec.cmd, MAXCOMLEN + 1);
 177             good_sections++;
 178           }
 179           break;
 180         case CORE_PROC:
 181           {
 182             struct proc_info proc_info;
 183             char  secname[100];  /* Of arbitrary size, but plenty large. */
 184
 185             /* We need to read this section, 'cause we need to determine
 186                whether the core-dumped app was threaded before we create
 187                any .reg sections. */
 188             if (bfd_read (&proc_info, 1, core_header.len, abfd)
 189                 != core_header.len)
 190               break;
 191
 192               /* However, we also want to create those sections with the
 193                  file positioned at the start of the record, it seems. */
 194             if (bfd_seek (abfd, -core_header.len, SEEK_CUR) != 0)
 195               break;
 196
 197 #if defined(PROC_INFO_HAS_THREAD_ID)
 198             core_kernel_thread_id (abfd) = proc_info.lwpid;
 199             core_user_thread_id (abfd) = proc_info.user_tid;
 200 #else
 201             core_kernel_thread_id (abfd) = 0;
 202             core_user_thread_id (abfd) = 0;
 203 #endif
 204             /* If the program was unthreaded, then we'll just create a
 205                .reg section.
 206
 207                If the program was threaded, then we'll create .reg/XXXXX
 208                section for each thread, where XXXXX is a printable
 209                representation of the kernel thread id.  We'll also
 210                create a .reg section for the thread that was running
 211                and signalled at the time of the core-dump (i.e., this
 212                is effectively an alias, needed to keep GDB happy.)
 213
 214                Note that we use `.reg/XXXXX' as opposed to '.regXXXXX'
 215                because GDB expects that .reg2 will be the floating-
 216                point registers. */
 217             if (core_kernel_thread_id (abfd) == 0)
 218               {
 219                 if (!make_bfd_asection (abfd, ".reg",
 220                                         SEC_HAS_CONTENTS,
 221                                         core_header.len,
 222                                         (int) &proc_info - (int) & proc_info.hw_regs,
 223                                         2))
 224                   return NULL;
 225               }
 226             else
 227               {
 228                 /* There are threads.  Is this the one that caused the
 229                    core-dump?  We'll claim it was the running thread. */
 230                 if (proc_info.sig != -1)
 231                   {
 232                     if (!make_bfd_asection (abfd, ".reg",
 233                                             SEC_HAS_CONTENTS,
 234                                             core_header.len,
 235                                             (int) &proc_info - (int) & proc_info.hw_regs,
 236                                             2))
 237                       return NULL;
 238                   }
 239                 /* We always make one of these sections, for every thread. */
 240                 sprintf (secname, ".reg/%d", core_kernel_thread_id (abfd));
 241                 if (!make_bfd_asection (abfd, secname,
 242                                         SEC_HAS_CONTENTS,
 243                                         core_header.len,
 244                                         (int) &proc_info - (int) & proc_info.hw_regs,
 245                                         2))
 246                   return NULL;
 247               }
 248             core_signal (abfd) = proc_info.sig;
 249             if (bfd_seek (abfd, core_header.len, SEEK_CUR) != 0)
 250               break;
 251             good_sections++;
 252           }
 253           break;
 254
 255         case CORE_DATA:
 256         case CORE_STACK:
 257         case CORE_TEXT:
 258         case CORE_MMF:
 259         case CORE_SHM:
 260         case CORE_ANON_SHMEM:
 261           if (!make_bfd_asection (abfd, ".data",
 262                                   SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 263                                   core_header.len, core_header.addr, 2))
 264             return NULL;
 265
 266           bfd_seek (abfd, core_header.len, SEEK_CUR);
 267           good_sections++;
 268           break;
 269
 270         case CORE_NONE:
 271           /* Let's not punt if we encounter a section of unknown
 272              type.  Rather, let's make a note of it.  If we later
 273              see that there were also "good" sections, then we'll
 274              declare that this a core file, but we'll also warn that
 275              it may be incompatible with this gdb.
 276              */
 277           unknown_sections++;
 278           break;
 279
 280          default: return 0; /*unrecognized core file type */
 281         }
 282     }
 283
 284   /* OK, we believe you.  You're a core file (sure, sure).  */
 285
 286   /* Were there sections of unknown type?  If so, yet there were
 287      at least some complete sections of known type, then, issue
 288      a warning.  Possibly the core file was generated on a version
 289      of HP-UX that is incompatible with that for which this gdb was
 290      built.
 291      */
 292   if ((unknown_sections > 0) && (good_sections > 0))
 293     warning ("%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",
 294              abfd->filename);
 295
 296   return abfd->xvec;
 297 }
 298
 299 static char *
 300 hpux_core_core_file_failing_command (abfd)
 301      bfd *abfd;
 302 {
 303   return core_command (abfd);
 304 }
 305
 306 /* ARGSUSED */
 307 static int
 308 hpux_core_core_file_failing_signal (abfd)
 309      bfd *abfd;
 310 {
 311   return core_signal (abfd);
 312 }
 313
 314 /* ARGSUSED */
 315 static boolean
 316 hpux_core_core_file_matches_executable_p (core_bfd, exec_bfd)
 317      bfd *core_bfd, *exec_bfd;
 318 {
 319   return true;                  /* FIXME, We have no way of telling at this point */
 320 }
 321 \f
 322 #define hpux_core_get_symtab_upper_bound _bfd_nosymbols_get_symtab_upper_bound
 323 #define hpux_core_get_symtab _bfd_nosymbols_get_symtab
 324 #define hpux_core_print_symbol _bfd_nosymbols_print_symbol
 325 #define hpux_core_get_symbol_info _bfd_nosymbols_get_symbol_info
 326 #define hpux_core_bfd_is_local_label_name \
 327   _bfd_nosymbols_bfd_is_local_label_name
 328 #define hpux_core_get_lineno _bfd_nosymbols_get_lineno
 329 #define hpux_core_find_nearest_line _bfd_nosymbols_find_nearest_line
 330 #define hpux_core_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
 331 #define hpux_core_read_minisymbols _bfd_nosymbols_read_minisymbols
 332 #define hpux_core_minisymbol_to_symbol _bfd_nosymbols_minisymbol_to_symbol
 333
 334 /* If somebody calls any byte-swapping routines, shoot them.  */
 335 static void
 336 swap_abort()
 337 {
 338   abort(); /* This way doesn't require any declaration for ANSI to fuck up */
 339 }
 340 #define NO_GET  ((bfd_vma (*) PARAMS ((   const bfd_byte *))) swap_abort )
 341 #define NO_PUT  ((void    (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort )
 342 #define NO_SIGNED_GET \
 343   ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort )
 344
 345 const bfd_target hpux_core_vec =
 346   {
 347     "hpux-core",
 348     bfd_target_unknown_flavour,
 349     BFD_ENDIAN_BIG,             /* target byte order */
 350     BFD_ENDIAN_BIG,             /* target headers byte order */
 351     (HAS_RELOC | EXEC_P |       /* object flags */
 352      HAS_LINENO | HAS_DEBUG |
 353      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 354     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 355     0,                                                     /* symbol prefix */
 356     ' ',                                                   /* ar_pad_char */
 357     16,                                                    /* ar_max_namelen */
 358     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit data */
 359     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit data */
 360     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit data */
 361     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit hdrs */
 362     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit hdrs */
 363     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit hdrs */
 364
 365     {                           /* bfd_check_format */
 366      _bfd_dummy_target,         /* unknown format */
 367      _bfd_dummy_target,         /* object file */
 368      _bfd_dummy_target,         /* archive */
 369      hpux_core_core_file_p      /* a core file */
 370     },
 371     {                           /* bfd_set_format */
 372      bfd_false, bfd_false,
 373      bfd_false, bfd_false
 374     },
 375     {                           /* bfd_write_contents */
 376      bfd_false, bfd_false,
 377      bfd_false, bfd_false
 378     },
 379
 380        BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 381        BFD_JUMP_TABLE_COPY (_bfd_generic),
 382        BFD_JUMP_TABLE_CORE (hpux_core),
 383        BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 384        BFD_JUMP_TABLE_SYMBOLS (hpux_core),
 385        BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 386        BFD_JUMP_TABLE_WRITE (_bfd_generic),
 387        BFD_JUMP_TABLE_LINK (_bfd_nolink),
 388        BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 389
 390     (PTR) 0                     /* backend_data */
 391 };