bfd/hppabsd-core.c

   1 /* BFD back-end for HPPA BSD core files.
   2    Copyright (C) 1993-2025 Free Software Foundation, Inc.
   3
   4    This file is part of BFD, the Binary File Descriptor library.
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  19    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 #define hppabsd_core_core_file_matches_executable_p generic_core_file_matches_executable_p
  52 #define hppabsd_core_core_file_pid _bfd_nocore_core_file_pid
  53
  54 /* These are stored in the bfd's tdata.  */
  55
  56 struct hppabsd_core_struct
  57 {
  58   int sig;
  59   char cmd[MAXCOMLEN + 1];
  60   asection *data_section;
  61   asection *stack_section;
  62   asection *reg_section;
  63 };
  64
  65 #define core_hdr(bfd) ((bfd)->tdata.hppabsd_core_data)
  66 #define core_signal(bfd)   (core_hdr(bfd)->sig)
  67 #define core_command(bfd)  (core_hdr(bfd)->cmd)
  68 #define core_datasec(bfd)  (core_hdr(bfd)->data_section)
  69 #define core_stacksec(bfd) (core_hdr(bfd)->stack_section)
  70 #define core_regsec(bfd)   (core_hdr(bfd)->reg_section)
  71
  72 static asection *
  73 make_bfd_asection (bfd *abfd,
  74                    const char *name,
  75                    flagword flags,
  76                    bfd_size_type size,
  77                    file_ptr offset,
  78                    unsigned int alignment_power)
  79 {
  80   asection *asect;
  81
  82   asect = bfd_make_section_with_flags (abfd, name, flags);
  83   if (!asect)
  84     return NULL;
  85
  86   asect->size = size;
  87   asect->filepos = offset;
  88   asect->alignment_power = alignment_power;
  89
  90   return asect;
  91 }
  92
  93 static bfd_cleanup
  94 hppabsd_core_core_file_p (bfd *abfd)
  95 {
  96   int val;
  97   struct user u;
  98   struct hppabsd_core_struct *coredata;
  99   int clicksz;
 100
 101   /* Try to read in the u-area.  We will need information from this
 102      to know how to grok the rest of the core structures.  */
 103   val = bfd_read (&u, sizeof u, abfd);
 104   if (val != sizeof u)
 105     {
 106       if (bfd_get_error () != bfd_error_system_call)
 107         bfd_set_error (bfd_error_wrong_format);
 108       return NULL;
 109     }
 110
 111   /* Get the page size out of the u structure.  This will be different
 112      for PA 1.0 machines and PA 1.1 machines.   Yuk!  */
 113   clicksz = u.u_pcb.pcb_pgsz;
 114
 115   /* clicksz must be a power of two >= 2k.  */
 116   if (clicksz < 0x800
 117       || clicksz != (clicksz & -clicksz))
 118     {
 119       bfd_set_error (bfd_error_wrong_format);
 120       return NULL;
 121     }
 122
 123   /* Sanity checks.  Make sure the size of the core file matches the
 124      the size computed from information within the core itself.  */
 125   {
 126     struct stat statbuf;
 127
 128     if (bfd_stat (abfd, &statbuf) < 0)
 129       return NULL;
 130
 131     if (NBPG * (UPAGES + u.u_dsize + u.u_ssize) > statbuf.st_size)
 132       {
 133         bfd_set_error (bfd_error_file_truncated);
 134         return NULL;
 135       }
 136     if (clicksz * (UPAGES + u.u_dsize + u.u_ssize) < statbuf.st_size)
 137       {
 138         /* The file is too big.  Maybe it's not a core file
 139            or we otherwise have bad values for u_dsize and u_ssize).  */
 140         bfd_set_error (bfd_error_wrong_format);
 141         return NULL;
 142       }
 143   }
 144
 145   /* OK, we believe you.  You're a core file (sure, sure).  */
 146
 147   coredata = (struct hppabsd_core_struct *)
 148     bfd_zalloc (abfd, (bfd_size_type) sizeof (struct hppabsd_core_struct));
 149   if (!coredata)
 150     return NULL;
 151
 152   /* Make the core data and available via the tdata part of the BFD.  */
 153   abfd->tdata.hppabsd_core_data = coredata;
 154
 155   /* Create the sections.  */
 156   core_stacksec (abfd) = make_bfd_asection (abfd, ".stack",
 157                                            SEC_ALLOC + SEC_HAS_CONTENTS,
 158                                            clicksz * u.u_ssize,
 159                                            NBPG * (USIZE + KSTAKSIZE)
 160                                              + clicksz * u.u_dsize, 2);
 161   if (core_stacksec (abfd) == NULL)
 162     goto fail;
 163   core_stacksec (abfd)->vma = USRSTACK;
 164
 165   core_datasec (abfd) = make_bfd_asection (abfd, ".data",
 166                                           SEC_ALLOC + SEC_LOAD
 167                                             + SEC_HAS_CONTENTS,
 168                                           clicksz * u.u_dsize,
 169                                           NBPG * (USIZE + KSTAKSIZE), 2);
 170   if (core_datasec (abfd) == NULL)
 171     goto fail;
 172   core_datasec (abfd)->vma = UDATASEG;
 173
 174   core_regsec (abfd) = make_bfd_asection (abfd, ".reg",
 175                                          SEC_HAS_CONTENTS,
 176                                          KSTAKSIZE * NBPG,
 177                                          NBPG * USIZE, 2);
 178   if (core_regsec (abfd) == NULL)
 179     goto fail;
 180   core_regsec (abfd)->vma = 0;
 181
 182   strncpy (core_command (abfd), u.u_comm, MAXCOMLEN);
 183   core_command (abfd)[MAXCOMLEN] = 0;
 184   core_signal (abfd) = u.u_code;
 185   return _bfd_no_cleanup;
 186
 187  fail:
 188   bfd_release (abfd, abfd->tdata.any);
 189   abfd->tdata.any = NULL;
 190   bfd_section_list_clear (abfd);
 191   return NULL;
 192 }
 193
 194 static char *
 195 hppabsd_core_core_file_failing_command (bfd *abfd)
 196 {
 197   return core_command (abfd);
 198 }
 199
 200 static int
 201 hppabsd_core_core_file_failing_signal (bfd *abfd)
 202 {
 203   return core_signal (abfd);
 204 }
 205 \f
 206 /* If somebody calls any byte-swapping routines, shoot them.  */
 207 static void
 208 swap_abort (void)
 209 {
 210   /* This way doesn't require any declaration for ANSI to fuck up.  */
 211   abort ();
 212 }
 213
 214 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
 215 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
 216 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
 217 #define NO_GET64 ((uint64_t (*) (const void *)) swap_abort)
 218 #define NO_PUT64 ((void (*) (uint64_t, void *)) swap_abort)
 219 #define NO_GETS64 ((int64_t (*) (const void *)) swap_abort)
 220
 221 const bfd_target core_hppabsd_vec =
 222   {
 223     "hppabsd-core",
 224     bfd_target_unknown_flavour,
 225     BFD_ENDIAN_BIG,             /* target byte order */
 226     BFD_ENDIAN_BIG,             /* target headers byte order */
 227     (HAS_RELOC | EXEC_P |       /* object flags */
 228      HAS_LINENO | HAS_DEBUG |
 229      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 230     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 231     0,                                                     /* symbol prefix */
 232     ' ',                                                   /* ar_pad_char */
 233     16,                                                    /* ar_max_namelen */
 234     TARGET_KEEP_UNUSED_SECTION_SYMBOLS, /* keep unused section symbols.  */
 235     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit data */
 236     NO_GET, NO_GETS, NO_PUT,            /* 32 bit data */
 237     NO_GET, NO_GETS, NO_PUT,            /* 16 bit data */
 238     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit hdrs */
 239     NO_GET, NO_GETS, NO_PUT,            /* 32 bit hdrs */
 240     NO_GET, NO_GETS, NO_PUT,            /* 16 bit hdrs */
 241
 242     {                           /* bfd_check_format */
 243       _bfd_dummy_target,                /* unknown format */
 244       _bfd_dummy_target,                /* object file */
 245       _bfd_dummy_target,                /* archive */
 246       hppabsd_core_core_file_p          /* a core file */
 247     },
 248     {                           /* bfd_set_format */
 249       _bfd_bool_bfd_false_error,
 250       _bfd_bool_bfd_false_error,
 251       _bfd_bool_bfd_false_error,
 252       _bfd_bool_bfd_false_error
 253     },
 254     {                           /* bfd_write_contents */
 255       _bfd_bool_bfd_false_error,
 256       _bfd_bool_bfd_false_error,
 257       _bfd_bool_bfd_false_error,
 258       _bfd_bool_bfd_false_error
 259     },
 260
 261     BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 262     BFD_JUMP_TABLE_COPY (_bfd_generic),
 263     BFD_JUMP_TABLE_CORE (hppabsd_core),
 264     BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 265     BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 266     BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 267     BFD_JUMP_TABLE_WRITE (_bfd_generic),
 268     BFD_JUMP_TABLE_LINK (_bfd_nolink),
 269     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 270
 271     NULL,
 272
 273     NULL                        /* backend_data */
 274   };
 275 #endif