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 2 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, MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include "bfd.h"
  24 #include "libbfd.h"
  25
  26 #ifdef LYNX_CORE
  27
  28 #include <sys/conf.h>
  29 #include <sys/kernel.h>
  30 /* sys/kernel.h should define this, but doesn't always, sigh.  */
  31 #ifndef __LYNXOS
  32 #define __LYNXOS
  33 #endif
  34 #include <sys/mem.h>
  35 #include <sys/signal.h>
  36 #include <sys/time.h>
  37 #include <sys/resource.h>
  38 #include <sys/itimer.h>
  39 #include <sys/file.h>
  40 #include <sys/proc.h>
  41
  42 /* These are stored in the bfd's tdata */
  43
  44 struct lynx_core_struct
  45 {
  46   int sig;
  47   char cmd[PNMLEN + 1];
  48 };
  49
  50 #define core_hdr(bfd) ((bfd)->tdata.lynx_core_data)
  51 #define core_signal(bfd) (core_hdr(bfd)->sig)
  52 #define core_command(bfd) (core_hdr(bfd)->cmd)
  53
  54 #define lynx_core_file_matches_executable_p generic_core_file_matches_executable_p
  55
  56 /* Handle Lynx core dump file.  */
  57
  58 static asection *
  59 make_bfd_asection (abfd, name, flags, size, vma, filepos)
  60      bfd *abfd;
  61      const char *name;
  62      flagword flags;
  63      bfd_size_type size;
  64      bfd_vma vma;
  65      file_ptr filepos;
  66 {
  67   asection *asect;
  68   char *newname;
  69
  70   newname = bfd_alloc (abfd, (bfd_size_type) strlen (name) + 1);
  71   if (!newname)
  72     return NULL;
  73
  74   strcpy (newname, name);
  75
  76   asect = bfd_make_section_with_flags (abfd, newname, flags);
  77   if (!asect)
  78     return NULL;
  79
  80   asect->size = size;
  81   asect->vma = vma;
  82   asect->filepos = filepos;
  83   asect->alignment_power = 2;
  84
  85   return asect;
  86 }
  87
  88 const bfd_target *
  89 lynx_core_file_p (abfd)
  90      bfd *abfd;
  91 {
  92   int secnum;
  93   struct pssentry pss;
  94   bfd_size_type tcontext_size;
  95   core_st_t *threadp;
  96   int pagesize;
  97   asection *newsect;
  98   bfd_size_type amt;
  99
 100   pagesize = getpagesize ();    /* Serious cross-target issue here...  This
 101                                    really needs to come from a system-specific
 102                                    header file.  */
 103
 104   /* Get the pss entry from the core file */
 105
 106   if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
 107     return NULL;
 108
 109   amt = sizeof pss;
 110   if (bfd_bread ((void *) &pss, amt, abfd) != amt)
 111     {
 112       /* Too small to be a core file */
 113       if (bfd_get_error () != bfd_error_system_call)
 114         bfd_set_error (bfd_error_wrong_format);
 115       return NULL;
 116     }
 117
 118   amt = sizeof (struct lynx_core_struct);
 119   core_hdr (abfd) = (struct lynx_core_struct *) bfd_zalloc (abfd, amt);
 120
 121   if (!core_hdr (abfd))
 122     return NULL;
 123
 124   strncpy (core_command (abfd), pss.pname, PNMLEN + 1);
 125
 126   /* Compute the size of the thread contexts */
 127
 128   tcontext_size = pss.threadcnt * sizeof (core_st_t);
 129
 130   /* Allocate space for the thread contexts */
 131
 132   threadp = (core_st_t *) bfd_alloc (abfd, tcontext_size);
 133   if (!threadp)
 134     goto fail;
 135
 136   /* Save thread contexts */
 137
 138   if (bfd_seek (abfd, (file_ptr) pagesize, SEEK_SET) != 0)
 139     goto fail;
 140
 141   if (bfd_bread ((void *) threadp, tcontext_size, abfd) != 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       goto fail;
 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     goto fail;
 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     goto fail;
 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     goto fail;
 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         goto fail;
 204     }
 205
 206   return abfd->xvec;
 207
 208  fail:
 209   bfd_release (abfd, core_hdr (abfd));
 210   core_hdr (abfd) = NULL;
 211   bfd_section_list_clear (abfd);
 212   return NULL;
 213 }
 214
 215 char *
 216 lynx_core_file_failing_command (abfd)
 217      bfd *abfd;
 218 {
 219   return core_command (abfd);
 220 }
 221
 222 int
 223 lynx_core_file_failing_signal (abfd)
 224      bfd *abfd;
 225 {
 226   return core_signal (abfd);
 227 }
 228
 229 #endif /* LYNX_CORE */