bfd/lynx-core.c

   1 /* BFD back end for Lynx core files
   2    Copyright 1993, 1994, 1995, 2001, 2002, 2004, 2006, 2007
   3    Free Software Foundation, Inc.
   4    Written by Stu Grossman of 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
  21    MA 02110-1301, USA.  */
  22
  23 #include "sysdep.h"
  24 #include "bfd.h"
  25 #include "libbfd.h"
  26
  27 #ifdef LYNX_CORE
  28
  29 #include <sys/conf.h>
  30 #include <sys/kernel.h>
  31 /* sys/kernel.h should define this, but doesn't always, sigh.  */
  32 #ifndef __LYNXOS
  33 #define __LYNXOS
  34 #endif
  35 #include <sys/mem.h>
  36 #include <sys/signal.h>
  37 #include <sys/time.h>
  38 #include <sys/resource.h>
  39 #include <sys/itimer.h>
  40 #include <sys/file.h>
  41 #include <sys/proc.h>
  42
  43 /* These are stored in the bfd's tdata */
  44
  45 struct lynx_core_struct
  46 {
  47   int sig;
  48   char cmd[PNMLEN + 1];
  49 };
  50
  51 #define core_hdr(bfd) ((bfd)->tdata.lynx_core_data)
  52 #define core_signal(bfd) (core_hdr(bfd)->sig)
  53 #define core_command(bfd) (core_hdr(bfd)->cmd)
  54
  55 #define lynx_core_file_matches_executable_p generic_core_file_matches_executable_p
  56
  57 /* Handle Lynx core dump file.  */
  58
  59 static asection *
  60 make_bfd_asection (abfd, name, flags, size, vma, filepos)
  61      bfd *abfd;
  62      const char *name;
  63      flagword flags;
  64      bfd_size_type size;
  65      bfd_vma vma;
  66      file_ptr filepos;
  67 {
  68   asection *asect;
  69   char *newname;
  70
  71   newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1);
  72   if (!newname)
  73     return NULL;
  74
  75   strcpy (newname, name);
  76
  77   asect = bfd_make_section_with_flags (abfd, newname, flags);
  78   if (!asect)
  79     return NULL;
  80
  81   asect->size = size;
  82   asect->vma = vma;
  83   asect->filepos = filepos;
  84   asect->alignment_power = 2;
  85
  86   return asect;
  87 }
  88
  89 const bfd_target *
  90 lynx_core_file_p (abfd)
  91      bfd *abfd;
  92 {
  93   int secnum;
  94   struct pssentry pss;
  95   bfd_size_type tcontext_size;
  96   core_st_t *threadp;
  97   int pagesize;
  98   asection *newsect;
  99   bfd_size_type amt;
 100
 101   pagesize = getpagesize ();    /* Serious cross-target issue here...  This
 102                                    really needs to come from a system-specific
 103                                    header file.  */
 104
 105   /* Get the pss entry from the core file */
 106
 107   if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
 108     return NULL;
 109
 110   amt = sizeof pss;
 111   if (bfd_bread ((void *) &pss, amt, abfd) != amt)
 112     {
 113       /* Too small to be a core file */
 114       if (bfd_get_error () != bfd_error_system_call)
 115         bfd_set_error (bfd_error_wrong_format);
 116       return NULL;
 117     }
 118
 119   amt = sizeof (struct lynx_core_struct);
 120   core_hdr (abfd) = (struct lynx_core_struct *) bfd_zalloc (abfd, amt);
 121
 122   if (!core_hdr (abfd))
 123     return NULL;
 124
 125   strncpy (core_command (abfd), pss.pname, PNMLEN + 1);
 126
 127   /* Compute the size of the thread contexts */
 128
 129   tcontext_size = pss.threadcnt * sizeof (core_st_t);
 130
 131   /* Allocate space for the thread contexts */
 132
 133   threadp = (core_st_t *) bfd_alloc (abfd, tcontext_size);
 134   if (!threadp)
 135     goto fail;
 136
 137   /* Save thread contexts */
 138
 139   if (bfd_seek (abfd, (file_ptr) pagesize, SEEK_SET) != 0)
 140     goto fail;
 141
 142   if (bfd_bread ((void *) threadp, tcontext_size, abfd) != tcontext_size)
 143     {
 144       /* Probably too small to be a core file */
 145       if (bfd_get_error () != bfd_error_system_call)
 146         bfd_set_error (bfd_error_wrong_format);
 147       goto fail;
 148     }
 149
 150   core_signal (abfd) = threadp->currsig;
 151
 152   newsect = make_bfd_asection (abfd, ".stack",
 153                                SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 154                                pss.ssize,
 155                                pss.slimit,
 156                                pagesize + tcontext_size);
 157   if (!newsect)
 158     goto fail;
 159
 160   newsect = make_bfd_asection (abfd, ".data",
 161                                SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 162                                pss.data_len + pss.bss_len,
 163                                pss.data_start,
 164                                pagesize + tcontext_size + pss.ssize
 165 #if defined (SPARC) || defined (__SPARC__)
 166                                /* SPARC Lynx seems to start dumping
 167                                   the .data section at a page
 168                                   boundary.  It's OK to check a
 169                                   #define like SPARC here because this
 170                                   file can only be compiled on a Lynx
 171                                   host.  */
 172                                + pss.data_start % pagesize
 173 #endif
 174                                );
 175   if (!newsect)
 176     goto fail;
 177
 178 /* And, now for the .reg/XXX pseudo sections.  Each thread has it's own
 179    .reg/XXX section, where XXX is the thread id (without leading zeros).  The
 180    currently running thread (at the time of the core dump) also has an alias
 181    called `.reg' (just to keep GDB happy).  Note that we use `.reg/XXX' as
 182    opposed to `.regXXX' because GDB expects that .reg2 will be the floating-
 183    point registers.  */
 184
 185   newsect = make_bfd_asection (abfd, ".reg",
 186                                SEC_HAS_CONTENTS,
 187                                sizeof (core_st_t),
 188                                0,
 189                                pagesize);
 190   if (!newsect)
 191     goto fail;
 192
 193   for (secnum = 0; secnum < pss.threadcnt; secnum++)
 194     {
 195       char secname[100];
 196
 197       sprintf (secname, ".reg/%d", BUILDPID (0, threadp[secnum].tid));
 198       newsect = make_bfd_asection (abfd, secname,
 199                                    SEC_HAS_CONTENTS,
 200                                    sizeof (core_st_t),
 201                                    0,
 202                                    pagesize + secnum * sizeof (core_st_t));
 203       if (!newsect)
 204         goto fail;
 205     }
 206
 207   return abfd->xvec;
 208
 209  fail:
 210   bfd_release (abfd, core_hdr (abfd));
 211   core_hdr (abfd) = NULL;
 212   bfd_section_list_clear (abfd);
 213   return NULL;
 214 }
 215
 216 char *
 217 lynx_core_file_failing_command (abfd)
 218      bfd *abfd;
 219 {
 220   return core_command (abfd);
 221 }
 222
 223 int
 224 lynx_core_file_failing_signal (abfd)
 225      bfd *abfd;
 226 {
 227   return core_signal (abfd);
 228 }
 229
 230 #endif /* LYNX_CORE */