bfd/lynx-core.c

   1 /* BFD back end for Lynx core files
   2    Copyright 1993, 1994, 1995, 2001, 2002, 2004, 2005, 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 #define lynx_core_file_pid _bfd_nocore_core_file_pid
  57
  58 /* Handle Lynx core dump file.  */
  59
  60 static asection *
  61 make_bfd_asection (abfd, name, flags, size, vma, filepos)
  62      bfd *abfd;
  63      const char *name;
  64      flagword flags;
  65      bfd_size_type size;
  66      bfd_vma vma;
  67      file_ptr filepos;
  68 {
  69   asection *asect;
  70   char *newname;
  71
  72   newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1);
  73   if (!newname)
  74     return NULL;
  75
  76   strcpy (newname, name);
  77
  78   asect = bfd_make_section_with_flags (abfd, newname, flags);
  79   if (!asect)
  80     return NULL;
  81
  82   asect->size = size;
  83   asect->vma = vma;
  84   asect->filepos = filepos;
  85   asect->alignment_power = 2;
  86
  87   return asect;
  88 }
  89
  90 const bfd_target *
  91 lynx_core_file_p (abfd)
  92      bfd *abfd;
  93 {
  94   int secnum;
  95   struct pssentry pss;
  96   bfd_size_type tcontext_size;
  97   core_st_t *threadp;
  98   int pagesize;
  99   asection *newsect;
 100   bfd_size_type amt;
 101
 102   pagesize = getpagesize ();    /* Serious cross-target issue here...  This
 103                                    really needs to come from a system-specific
 104                                    header file.  */
 105
 106   /* Get the pss entry from the core file */
 107
 108   if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
 109     return NULL;
 110
 111   amt = sizeof pss;
 112   if (bfd_bread ((void *) &pss, amt, abfd) != amt)
 113     {
 114       /* Too small to be a core file */
 115       if (bfd_get_error () != bfd_error_system_call)
 116         bfd_set_error (bfd_error_wrong_format);
 117       return NULL;
 118     }
 119
 120   amt = sizeof (struct lynx_core_struct);
 121   core_hdr (abfd) = (struct lynx_core_struct *) bfd_zalloc (abfd, amt);
 122
 123   if (!core_hdr (abfd))
 124     return NULL;
 125
 126   strncpy (core_command (abfd), pss.pname, PNMLEN + 1);
 127
 128   /* Compute the size of the thread contexts */
 129
 130   tcontext_size = pss.threadcnt * sizeof (core_st_t);
 131
 132   /* Allocate space for the thread contexts */
 133
 134   threadp = (core_st_t *) bfd_alloc (abfd, tcontext_size);
 135   if (!threadp)
 136     goto fail;
 137
 138   /* Save thread contexts */
 139
 140   if (bfd_seek (abfd, (file_ptr) pagesize, SEEK_SET) != 0)
 141     goto fail;
 142
 143   if (bfd_bread ((void *) threadp, tcontext_size, abfd) != tcontext_size)
 144     {
 145       /* Probably too small to be a core file */
 146       if (bfd_get_error () != bfd_error_system_call)
 147         bfd_set_error (bfd_error_wrong_format);
 148       goto fail;
 149     }
 150
 151   core_signal (abfd) = threadp->currsig;
 152
 153   newsect = make_bfd_asection (abfd, ".stack",
 154                                SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 155                                pss.ssize,
 156                                pss.slimit,
 157                                pagesize + tcontext_size);
 158   if (!newsect)
 159     goto fail;
 160
 161   newsect = make_bfd_asection (abfd, ".data",
 162                                SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 163                                pss.data_len + pss.bss_len,
 164                                pss.data_start,
 165                                pagesize + tcontext_size + pss.ssize
 166 #if defined (SPARC) || defined (__SPARC__)
 167                                /* SPARC Lynx seems to start dumping
 168                                   the .data section at a page
 169                                   boundary.  It's OK to check a
 170                                   #define like SPARC here because this
 171                                   file can only be compiled on a Lynx
 172                                   host.  */
 173                                + pss.data_start % pagesize
 174 #endif
 175                                );
 176   if (!newsect)
 177     goto fail;
 178
 179 /* And, now for the .reg/XXX pseudo sections.  Each thread has it's own
 180    .reg/XXX section, where XXX is the thread id (without leading zeros).  The
 181    currently running thread (at the time of the core dump) also has an alias
 182    called `.reg' (just to keep GDB happy).  Note that we use `.reg/XXX' as
 183    opposed to `.regXXX' because GDB expects that .reg2 will be the floating-
 184    point registers.  */
 185
 186   newsect = make_bfd_asection (abfd, ".reg",
 187                                SEC_HAS_CONTENTS,
 188                                sizeof (core_st_t),
 189                                0,
 190                                pagesize);
 191   if (!newsect)
 192     goto fail;
 193
 194   for (secnum = 0; secnum < pss.threadcnt; secnum++)
 195     {
 196       char secname[100];
 197
 198       sprintf (secname, ".reg/%d", BUILDPID (0, threadp[secnum].tid));
 199       newsect = make_bfd_asection (abfd, secname,
 200                                    SEC_HAS_CONTENTS,
 201                                    sizeof (core_st_t),
 202                                    0,
 203                                    pagesize + secnum * sizeof (core_st_t));
 204       if (!newsect)
 205         goto fail;
 206     }
 207
 208   return abfd->xvec;
 209
 210  fail:
 211   bfd_release (abfd, core_hdr (abfd));
 212   core_hdr (abfd) = NULL;
 213   bfd_section_list_clear (abfd);
 214   return NULL;
 215 }
 216
 217 char *
 218 lynx_core_file_failing_command (abfd)
 219      bfd *abfd;
 220 {
 221   return core_command (abfd);
 222 }
 223
 224 int
 225 lynx_core_file_failing_signal (abfd)
 226      bfd *abfd;
 227 {
 228   return core_signal (abfd);
 229 }
 230
 231 #endif /* LYNX_CORE */