bfd/lynx-core.c

   1 /* BFD back end for Lynx core files
   2    Copyright 1993, 1994, 1995, 2001 Free Software Foundation, Inc.
   3    Written by Stu Grossman of Cygnus Support.
   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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #include "bfd.h"
  22 #include "sysdep.h"
  23 #include "libbfd.h"
  24
  25 #ifdef LYNX_CORE
  26
  27 #include <sys/conf.h>
  28 #include <sys/kernel.h>
  29 /* sys/kernel.h should define this, but doesn't always, sigh.  */
  30 #ifndef __LYNXOS
  31 #define __LYNXOS
  32 #endif
  33 #include <sys/mem.h>
  34 #include <sys/signal.h>
  35 #include <sys/time.h>
  36 #include <sys/resource.h>
  37 #include <sys/itimer.h>
  38 #include <sys/file.h>
  39 #include <sys/proc.h>
  40
  41 /* These are stored in the bfd's tdata */
  42
  43 struct lynx_core_struct
  44 {
  45   int sig;
  46   char cmd[PNMLEN + 1];
  47 };
  48
  49 #define core_hdr(bfd) ((bfd)->tdata.lynx_core_data)
  50 #define core_signal(bfd) (core_hdr(bfd)->sig)
  51 #define core_command(bfd) (core_hdr(bfd)->cmd)
  52
  53 /* Handle Lynx core dump file.  */
  54
  55 static asection *
  56 make_bfd_asection (abfd, name, flags, _raw_size, vma, filepos)
  57      bfd *abfd;
  58      CONST char *name;
  59      flagword flags;
  60      bfd_size_type _raw_size;
  61      bfd_vma vma;
  62      file_ptr filepos;
  63 {
  64   asection *asect;
  65   char *newname;
  66
  67   newname = bfd_alloc (abfd, strlen (name) + 1);
  68   if (!newname)
  69     return NULL;
  70
  71   strcpy (newname, name);
  72
  73   asect = bfd_make_section (abfd, newname);
  74   if (!asect)
  75     return NULL;
  76
  77   asect->flags = flags;
  78   asect->_raw_size = _raw_size;
  79   asect->vma = vma;
  80   asect->filepos = filepos;
  81   asect->alignment_power = 2;
  82
  83   return asect;
  84 }
  85
  86 const bfd_target *
  87 lynx_core_file_p (abfd)
  88      bfd *abfd;
  89 {
  90   int val;
  91   int secnum;
  92   struct pssentry pss;
  93   size_t tcontext_size;
  94   core_st_t *threadp;
  95   int pagesize;
  96   asection *newsect;
  97
  98   pagesize = getpagesize ();    /* Serious cross-target issue here...  This
  99                                    really needs to come from a system-specific
 100                                    header file.  */
 101
 102   /* Get the pss entry from the core file */
 103
 104   if (bfd_seek (abfd, 0, SEEK_SET) != 0)
 105     return NULL;
 106
 107   val = bfd_read ((void *)&pss, 1, sizeof pss, abfd);
 108   if (val != sizeof pss)
 109     {
 110       /* Too small to be a core file */
 111       if (bfd_get_error () != bfd_error_system_call)
 112         bfd_set_error (bfd_error_wrong_format);
 113       return NULL;
 114     }
 115
 116   core_hdr (abfd) = (struct lynx_core_struct *)
 117     bfd_zalloc (abfd, sizeof (struct lynx_core_struct));
 118
 119   if (!core_hdr (abfd))
 120     return NULL;
 121
 122   strncpy (core_command (abfd), pss.pname, PNMLEN + 1);
 123
 124   /* Compute the size of the thread contexts */
 125
 126   tcontext_size = pss.threadcnt * sizeof (core_st_t);
 127
 128   /* Allocate space for the thread contexts */
 129
 130   threadp = (core_st_t *)bfd_alloc (abfd, tcontext_size);
 131   if (!threadp)
 132     return NULL;
 133
 134   /* Save thread contexts */
 135
 136   if (bfd_seek (abfd, pagesize, SEEK_SET) != 0)
 137     return NULL;
 138
 139   val = bfd_read ((void *)threadp, pss.threadcnt, sizeof (core_st_t), abfd);
 140
 141   if (val != tcontext_size)
 142     {
 143       /* Probably too small to be a core file */
 144       if (bfd_get_error () != bfd_error_system_call)
 145         bfd_set_error (bfd_error_wrong_format);
 146       return NULL;
 147     }
 148
 149   core_signal (abfd) = threadp->currsig;
 150
 151   newsect = make_bfd_asection (abfd, ".stack",
 152                                SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 153                                pss.ssize,
 154                                pss.slimit,
 155                                pagesize + tcontext_size);
 156   if (!newsect)
 157     return NULL;
 158
 159   newsect = make_bfd_asection (abfd, ".data",
 160                                SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 161                                pss.data_len + pss.bss_len,
 162                                pss.data_start,
 163                                pagesize + tcontext_size + pss.ssize
 164 #if defined (SPARC) || defined (__SPARC__)
 165                                /* SPARC Lynx seems to start dumping
 166                                   the .data section at a page
 167                                   boundary.  It's OK to check a
 168                                   #define like SPARC here because this
 169                                   file can only be compiled on a Lynx
 170                                   host.  */
 171                                + pss.data_start % pagesize
 172 #endif
 173                                );
 174   if (!newsect)
 175     return NULL;
 176
 177 /* And, now for the .reg/XXX pseudo sections.  Each thread has it's own
 178    .reg/XXX section, where XXX is the thread id (without leading zeros).  The
 179    currently running thread (at the time of the core dump) also has an alias
 180    called `.reg' (just to keep GDB happy).  Note that we use `.reg/XXX' as
 181    opposed to `.regXXX' because GDB expects that .reg2 will be the floating-
 182    point registers.  */
 183
 184   newsect = make_bfd_asection (abfd, ".reg",
 185                                SEC_HAS_CONTENTS,
 186                                sizeof (core_st_t),
 187                                0,
 188                                pagesize);
 189   if (!newsect)
 190     return NULL;
 191
 192   for (secnum = 0; secnum < pss.threadcnt; secnum++)
 193     {
 194       char secname[100];
 195
 196       sprintf (secname, ".reg/%d", BUILDPID (0, threadp[secnum].tid));
 197       newsect = make_bfd_asection (abfd, secname,
 198                                    SEC_HAS_CONTENTS,
 199                                    sizeof (core_st_t),
 200                                    0,
 201                                    pagesize + secnum * sizeof (core_st_t));
 202       if (!newsect)
 203         return NULL;
 204     }
 205
 206   return abfd->xvec;
 207 }
 208
 209 char *
 210 lynx_core_file_failing_command (abfd)
 211      bfd *abfd;
 212 {
 213   return core_command (abfd);
 214 }
 215
 216 int
 217 lynx_core_file_failing_signal (abfd)
 218      bfd *abfd;
 219 {
 220   return core_signal (abfd);
 221 }
 222
 223 boolean
 224 lynx_core_file_matches_executable_p  (core_bfd, exec_bfd)
 225      bfd *core_bfd, *exec_bfd;
 226 {
 227   return true;          /* FIXME, We have no way of telling at this point */
 228 }
 229
 230 #endif /* LYNX_CORE */