bfd/lynx-core.c

   1 /* BFD back end for Lynx core files
   2    Copyright 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 #include "bfd.h"
  22 #include "sysdep.h"
  23 #include "libbfd.h"
  24
  25 #ifdef HOST_LYNX                /* Core files only work locally for now */
  26
  27 /* These are stored in the bfd's tdata */
  28
  29 struct lynx_core_struct
  30 {
  31   int sig;
  32   char cmd[PNMLEN + 1];
  33 };
  34
  35 #define core_hdr(bfd) ((bfd)->tdata.lynx_core_data)
  36 #define core_signal(bfd) (core_hdr(bfd)->sig)
  37 #define core_command(bfd) (core_hdr(bfd)->cmd)
  38
  39 /* Handle Lynx core dump file.  */
  40
  41 static asection *
  42 make_bfd_asection (abfd, name, flags, _raw_size, vma, filepos)
  43      bfd *abfd;
  44      CONST char *name;
  45      flagword flags;
  46      bfd_size_type _raw_size;
  47      bfd_vma vma;
  48      file_ptr filepos;
  49 {
  50   asection *asect;
  51   char *newname;
  52
  53   newname = bfd_alloc (abfd, strlen (name) + 1);
  54   if (!newname)
  55     return NULL;
  56
  57   strcpy (newname, name);
  58
  59   asect = bfd_make_section (abfd, newname);
  60   if (!asect)
  61     return NULL;
  62
  63   asect->flags = flags;
  64   asect->_raw_size = _raw_size;
  65   asect->vma = vma;
  66   asect->filepos = filepos;
  67   asect->alignment_power = 2;
  68
  69   return asect;
  70 }
  71
  72 /* ARGSUSED */
  73 bfd_target *
  74 lynx_core_file_p (abfd)
  75      bfd *abfd;
  76 {
  77   int val;
  78   int secnum;
  79   struct pssentry pss;
  80   size_t tcontext_size;
  81   core_st_t *threadp;
  82   int pagesize;
  83   asection *newsect;
  84
  85   pagesize = getpagesize ();    /* Serious cross-target issue here...  This
  86                                    really needs to come from a system-specific
  87                                    header file.  */
  88
  89   /* Get the pss entry from the core file */
  90
  91   bfd_seek (abfd, 0, SEEK_SET);
  92
  93   val = bfd_read ((void *)&pss, 1, sizeof pss, abfd);
  94   if (val != sizeof pss)
  95     {
  96       /* Too small to be a core file */
  97       bfd_error = wrong_format;
  98       return NULL;
  99   }
 100
 101   core_hdr (abfd) = (struct lynx_core_struct *)
 102     bfd_zalloc (abfd, sizeof (struct lynx_core_struct));
 103
 104   if (!core_hdr (abfd))
 105     {
 106       bfd_error = no_memory;
 107       return NULL;
 108     }
 109
 110   strncpy (core_command (abfd), pss.pname, PNMLEN + 1);
 111
 112   /* Compute the size of the thread contexts */
 113
 114   tcontext_size = pss.threadcnt * sizeof (core_st_t);
 115
 116   /* Allocate space for the thread contexts */
 117
 118   threadp = (core_st_t *)bfd_zalloc (abfd, tcontext_size);
 119   if (!threadp)
 120     {
 121       bfd_error = no_memory;
 122       return NULL;
 123     }
 124
 125   /* Save thread contexts */
 126
 127   bfd_seek (abfd, pagesize, SEEK_SET);
 128
 129   val = bfd_read ((void *)threadp, pss.threadcnt, sizeof (core_st_t), abfd);
 130
 131   if (val != tcontext_size)
 132     {
 133       /* Probably too small to be a core file */
 134       bfd_error = wrong_format;
 135       return NULL;
 136     }
 137
 138   core_signal (abfd) = threadp->currsig;
 139
 140   newsect = make_bfd_asection (abfd, ".stack",
 141                                SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 142                                pss.ssize,
 143                                pss.slimit,
 144                                pagesize + tcontext_size);
 145   if (!newsect)
 146     {
 147       bfd_error = no_memory;
 148       return NULL;
 149     }
 150
 151   newsect = make_bfd_asection (abfd, ".data",
 152                                SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 153                                pss.data_len + pss.bss_len,
 154                                pss.data_start,
 155                                pagesize + tcontext_size + pss.ssize);
 156   if (!newsect)
 157     {
 158       bfd_error = no_memory;
 159       return NULL;
 160     }
 161
 162   for (secnum = 0; secnum < pss.threadcnt; secnum++)
 163     {
 164       char secname[100];
 165
 166       sprintf (secname, ".reg%d", threadp[secnum].tid);
 167       newsect = make_bfd_asection (abfd, secname,
 168                                    SEC_ALLOC + SEC_HAS_CONTENTS,
 169                                    sizeof (core_st_t),
 170                                    0,
 171                                    pagesize + secnum * sizeof (core_st_t));
 172       if (!newsect)
 173         {
 174           bfd_error = no_memory;
 175           return NULL;
 176         }
 177     }
 178
 179   return abfd->xvec;
 180 }
 181
 182 char *
 183 lynx_core_file_failing_command (abfd)
 184      bfd *abfd;
 185 {
 186   return core_command (abfd);
 187 }
 188
 189 /* ARGSUSED */
 190 int
 191 lynx_core_file_failing_signal (abfd)
 192      bfd *abfd;
 193 {
 194   return core_signal (abfd);
 195 }
 196
 197 /* ARGSUSED */
 198 boolean
 199 lynx_core_file_matches_executable_p  (core_bfd, exec_bfd)
 200      bfd *core_bfd, *exec_bfd;
 201 {
 202   return true;          /* FIXME, We have no way of telling at this point */
 203 }
 204
 205 #endif /* HOST_LYNX */