bfd/lynx-core.c

   1 /* BFD back end for Lynx core files
   2    Copyright (C) 1993-2020 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
  20    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 #define lynx_core_file_pid _bfd_nocore_core_file_pid
  56
  57 /* Handle Lynx core dump file.  */
  58
  59 static asection *
  60 make_bfd_asection (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 (bfd *abfd)
  90 {
  91   int secnum;
  92   struct pssentry pss;
  93   bfd_size_type tcontext_size;
  94   core_st_t *threadp;
  95   int pagesize;
  96   asection *newsect;
  97   bfd_size_type amt;
  98
  99   pagesize = getpagesize ();    /* Serious cross-target issue here...  This
 100                                    really needs to come from a system-specific
 101                                    header file.  */
 102
 103   /* Get the pss entry from the core file */
 104
 105   if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
 106     return NULL;
 107
 108   amt = sizeof pss;
 109   if (bfd_bread ((void *) &pss, amt, abfd) != amt)
 110     {
 111       /* Too small to be a core file */
 112       if (bfd_get_error () != bfd_error_system_call)
 113         bfd_set_error (bfd_error_wrong_format);
 114       return NULL;
 115     }
 116
 117   amt = sizeof (struct lynx_core_struct);
 118   core_hdr (abfd) = (struct lynx_core_struct *) bfd_zalloc (abfd, amt);
 119
 120   if (!core_hdr (abfd))
 121     return NULL;
 122
 123   strncpy (core_command (abfd), pss.pname, PNMLEN + 1);
 124
 125   /* Compute the size of the thread contexts */
 126
 127   tcontext_size = pss.threadcnt * sizeof (core_st_t);
 128
 129   /* Allocate space for the thread contexts */
 130
 131   threadp = (core_st_t *) bfd_alloc (abfd, tcontext_size);
 132   if (!threadp)
 133     goto fail;
 134
 135   /* Save thread contexts */
 136
 137   if (bfd_seek (abfd, (file_ptr) pagesize, SEEK_SET) != 0)
 138     goto fail;
 139
 140   if (bfd_bread ((void *) threadp, tcontext_size, abfd) != tcontext_size)
 141     {
 142       /* Probably too small to be a core file */
 143       if (bfd_get_error () != bfd_error_system_call)
 144         bfd_set_error (bfd_error_wrong_format);
 145       goto fail;
 146     }
 147
 148   core_signal (abfd) = threadp->currsig;
 149
 150   newsect = make_bfd_asection (abfd, ".stack",
 151                                SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 152                                pss.ssize,
 153                                pss.slimit,
 154                                pagesize + tcontext_size);
 155   if (!newsect)
 156     goto fail;
 157
 158   newsect = make_bfd_asection (abfd, ".data",
 159                                SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS,
 160                                pss.data_len + pss.bss_len,
 161                                pss.data_start,
 162                                pagesize + tcontext_size + pss.ssize
 163 #if defined (SPARC) || defined (__SPARC__)
 164                                /* SPARC Lynx seems to start dumping
 165                                   the .data section at a page
 166                                   boundary.  It's OK to check a
 167                                   #define like SPARC here because this
 168                                   file can only be compiled on a Lynx
 169                                   host.  */
 170                                + pss.data_start % pagesize
 171 #endif
 172                                );
 173   if (!newsect)
 174     goto fail;
 175
 176 /* And, now for the .reg/XXX pseudo sections.  Each thread has it's own
 177    .reg/XXX section, where XXX is the thread id (without leading zeros).  The
 178    currently running thread (at the time of the core dump) also has an alias
 179    called `.reg' (just to keep GDB happy).  Note that we use `.reg/XXX' as
 180    opposed to `.regXXX' because GDB expects that .reg2 will be the floating-
 181    point registers.  */
 182
 183   newsect = make_bfd_asection (abfd, ".reg",
 184                                SEC_HAS_CONTENTS,
 185                                sizeof (core_st_t),
 186                                0,
 187                                pagesize);
 188   if (!newsect)
 189     goto fail;
 190
 191   for (secnum = 0; secnum < pss.threadcnt; secnum++)
 192     {
 193       char secname[100];
 194
 195       sprintf (secname, ".reg/%d", BUILDPID (0, threadp[secnum].tid));
 196       newsect = make_bfd_asection (abfd, secname,
 197                                    SEC_HAS_CONTENTS,
 198                                    sizeof (core_st_t),
 199                                    0,
 200                                    pagesize + secnum * sizeof (core_st_t));
 201       if (!newsect)
 202         goto fail;
 203     }
 204
 205   return abfd->xvec;
 206
 207  fail:
 208   bfd_release (abfd, core_hdr (abfd));
 209   core_hdr (abfd) = NULL;
 210   bfd_section_list_clear (abfd);
 211   return NULL;
 212 }
 213
 214 char *
 215 lynx_core_file_failing_command (bfd *abfd)
 216 {
 217   return core_command (abfd);
 218 }
 219
 220 int
 221 lynx_core_file_failing_signal (bfd *abfd)
 222 {
 223   return core_signal (abfd);
 224 }
 225
 226 #endif /* LYNX_CORE */