bfd/hppabsd-core.c

   1 /* BFD back-end for HPPA BSD core files.
   2    Copyright 1993, 1994, 1995, 1998, 1999, 2001, 2002, 2003, 2004, 2005,
   3    2006, 2007 Free Software Foundation, Inc.
   4
   5    This file is part of BFD, the Binary File Descriptor library.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.
  20
  21    Written by the Center for Software Science at the University of Utah
  22    and by Cygnus Support.
  23
  24    The core file structure for the Utah 4.3BSD and OSF1 ports on the
  25    PA is a mix between traditional cores and hpux cores -- just
  26    different enough that supporting this format would tend to add
  27    gross hacks to trad-core.c or hpux-core.c.  So instead we keep any
  28    gross hacks isolated to this file.  */
  29
  30 /* This file can only be compiled on systems which use HPPA-BSD style
  31    core files.
  32
  33    I would not expect this to be of use to any other host/target, but
  34    you never know.  */
  35
  36 #include "sysdep.h"
  37 #include "bfd.h"
  38 #include "libbfd.h"
  39
  40 #if defined (HOST_HPPABSD)
  41
  42 #include "machine/vmparam.h"
  43
  44 #include <sys/param.h>
  45 #include <sys/dir.h>
  46 #include <signal.h>
  47 #include <machine/reg.h>
  48 #include <sys/user.h>           /* After a.out.h  */
  49 #include <sys/file.h>
  50
  51 static asection *make_bfd_asection
  52   PARAMS ((bfd *, const char *, flagword, bfd_size_type, file_ptr,
  53            unsigned int));
  54 static const bfd_target *hppabsd_core_core_file_p
  55   PARAMS ((bfd *));
  56 static char *hppabsd_core_core_file_failing_command
  57   PARAMS ((bfd *));
  58 static int hppabsd_core_core_file_failing_signal
  59   PARAMS ((bfd *));
  60 #define hppabsd_core_core_file_matches_executable_p generic_core_file_matches_executable_p
  61 static void swap_abort
  62   PARAMS ((void));
  63
  64 /* These are stored in the bfd's tdata.  */
  65
  66 struct hppabsd_core_struct
  67   {
  68     int sig;
  69     char cmd[MAXCOMLEN + 1];
  70     asection *data_section;
  71     asection *stack_section;
  72     asection *reg_section;
  73   };
  74
  75 #define core_hdr(bfd) ((bfd)->tdata.hppabsd_core_data)
  76 #define core_signal(bfd) (core_hdr(bfd)->sig)
  77 #define core_command(bfd) (core_hdr(bfd)->cmd)
  78 #define core_datasec(bfd) (core_hdr(bfd)->data_section)
  79 #define core_stacksec(bfd) (core_hdr(bfd)->stack_section)
  80 #define core_regsec(bfd) (core_hdr(bfd)->reg_section)
  81
  82 static asection *
  83 make_bfd_asection (abfd, name, flags, size, offset, alignment_power)
  84      bfd *abfd;
  85      const char *name;
  86      flagword flags;
  87      bfd_size_type size;
  88      file_ptr offset;
  89      unsigned int alignment_power;
  90 {
  91   asection *asect;
  92
  93   asect = bfd_make_section_with_flags (abfd, name, flags);
  94   if (!asect)
  95     return NULL;
  96
  97   asect->size = size;
  98   asect->filepos = offset;
  99   asect->alignment_power = alignment_power;
 100
 101   return asect;
 102 }
 103
 104 static const bfd_target *
 105 hppabsd_core_core_file_p (abfd)
 106      bfd *abfd;
 107 {
 108   int val;
 109   struct user u;
 110   struct hppabsd_core_struct *coredata;
 111   int clicksz;
 112
 113   /* Try to read in the u-area.  We will need information from this
 114      to know how to grok the rest of the core structures.  */
 115   val = bfd_bread ((void *) &u, (bfd_size_type) sizeof u, abfd);
 116   if (val != sizeof u)
 117     {
 118       if (bfd_get_error () != bfd_error_system_call)
 119         bfd_set_error (bfd_error_wrong_format);
 120       return NULL;
 121     }
 122
 123   /* Get the page size out of the u structure.  This will be different
 124      for PA 1.0 machines and PA 1.1 machines.   Yuk!  */
 125   clicksz = u.u_pcb.pcb_pgsz;
 126
 127   /* clicksz must be a power of two >= 2k.  */
 128   if (clicksz < 0x800
 129       || clicksz != (clicksz & -clicksz))
 130     {
 131       bfd_set_error (bfd_error_wrong_format);
 132       return NULL;
 133     }
 134
 135   /* Sanity checks.  Make sure the size of the core file matches the
 136      the size computed from information within the core itself.  */
 137   {
 138     struct stat statbuf;
 139
 140     if (bfd_stat (abfd, &statbuf) < 0)
 141       return NULL;
 142
 143     if (NBPG * (UPAGES + u.u_dsize + u.u_ssize) > statbuf.st_size)
 144       {
 145         bfd_set_error (bfd_error_file_truncated);
 146         return NULL;
 147       }
 148     if (clicksz * (UPAGES + u.u_dsize + u.u_ssize) < statbuf.st_size)
 149       {
 150         /* The file is too big.  Maybe it's not a core file
 151            or we otherwise have bad values for u_dsize and u_ssize).  */
 152         bfd_set_error (bfd_error_wrong_format);
 153         return NULL;
 154       }
 155   }
 156
 157   /* OK, we believe you.  You're a core file (sure, sure).  */
 158
 159   coredata = (struct hppabsd_core_struct *)
 160     bfd_zalloc (abfd, (bfd_size_type) sizeof (struct hppabsd_core_struct));
 161   if (!coredata)
 162     return NULL;
 163
 164   /* Make the core data and available via the tdata part of the BFD.  */
 165   abfd->tdata.hppabsd_core_data = coredata;
 166
 167   /* Create the sections.  */
 168   core_stacksec (abfd) = make_bfd_asection (abfd, ".stack",
 169                                            SEC_ALLOC + SEC_HAS_CONTENTS,
 170                                            clicksz * u.u_ssize,
 171                                            NBPG * (USIZE + KSTAKSIZE)
 172                                              + clicksz * u.u_dsize, 2);
 173   if (core_stacksec (abfd) == NULL)
 174     goto fail;
 175   core_stacksec (abfd)->vma = USRSTACK;
 176
 177   core_datasec (abfd) = make_bfd_asection (abfd, ".data",
 178                                           SEC_ALLOC + SEC_LOAD
 179                                             + SEC_HAS_CONTENTS,
 180                                           clicksz * u.u_dsize,
 181                                           NBPG * (USIZE + KSTAKSIZE), 2);
 182   if (core_datasec (abfd) == NULL)
 183     goto fail;
 184   core_datasec (abfd)->vma = UDATASEG;
 185
 186   core_regsec (abfd) = make_bfd_asection (abfd, ".reg",
 187                                          SEC_HAS_CONTENTS,
 188                                          KSTAKSIZE * NBPG,
 189                                          NBPG * USIZE, 2);
 190   if (core_regsec (abfd) == NULL)
 191     goto fail;
 192   core_regsec (abfd)->vma = 0;
 193
 194   strncpy (core_command (abfd), u.u_comm, MAXCOMLEN + 1);
 195   core_signal (abfd) = u.u_code;
 196   return abfd->xvec;
 197
 198  fail:
 199   bfd_release (abfd, abfd->tdata.any);
 200   abfd->tdata.any = NULL;
 201   bfd_section_list_clear (abfd);
 202   return NULL;
 203 }
 204
 205 static char *
 206 hppabsd_core_core_file_failing_command (abfd)
 207      bfd *abfd;
 208 {
 209   return core_command (abfd);
 210 }
 211
 212 static int
 213 hppabsd_core_core_file_failing_signal (abfd)
 214      bfd *abfd;
 215 {
 216   return core_signal (abfd);
 217 }
 218 \f
 219 /* If somebody calls any byte-swapping routines, shoot them.  */
 220 static void
 221 swap_abort ()
 222 {
 223   /* This way doesn't require any declaration for ANSI to fuck up.  */
 224   abort ();
 225 }
 226
 227 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
 228 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
 229 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
 230 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
 231 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
 232 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
 233
 234 const bfd_target hppabsd_core_vec =
 235   {
 236     "hppabsd-core",
 237     bfd_target_unknown_flavour,
 238     BFD_ENDIAN_BIG,             /* target byte order */
 239     BFD_ENDIAN_BIG,             /* target headers byte order */
 240     (HAS_RELOC | EXEC_P |       /* object flags */
 241      HAS_LINENO | HAS_DEBUG |
 242      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 243     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 244     0,                                                     /* symbol prefix */
 245     ' ',                                                   /* ar_pad_char */
 246     16,                                                    /* ar_max_namelen */
 247     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit data */
 248     NO_GET, NO_GETS, NO_PUT,            /* 32 bit data */
 249     NO_GET, NO_GETS, NO_PUT,            /* 16 bit data */
 250     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit hdrs */
 251     NO_GET, NO_GETS, NO_PUT,            /* 32 bit hdrs */
 252     NO_GET, NO_GETS, NO_PUT,            /* 16 bit hdrs */
 253
 254     {                           /* bfd_check_format */
 255       _bfd_dummy_target,                /* unknown format */
 256       _bfd_dummy_target,                /* object file */
 257       _bfd_dummy_target,                /* archive */
 258       hppabsd_core_core_file_p          /* a core file */
 259     },
 260     {                           /* bfd_set_format */
 261       bfd_false, bfd_false,
 262       bfd_false, bfd_false
 263     },
 264     {                           /* bfd_write_contents */
 265       bfd_false, bfd_false,
 266       bfd_false, bfd_false
 267     },
 268
 269     BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 270     BFD_JUMP_TABLE_COPY (_bfd_generic),
 271     BFD_JUMP_TABLE_CORE (hppabsd_core),
 272     BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 273     BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 274     BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 275     BFD_JUMP_TABLE_WRITE (_bfd_generic),
 276     BFD_JUMP_TABLE_LINK (_bfd_nolink),
 277     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 278
 279     NULL,
 280
 281     (PTR) 0                     /* backend_data */
 282   };
 283 #endif