bfd/ptrace-core.c

   1 /* BFD backend for core files which use the ptrace_user structure
   2    Copyright 1993, 1994, 1995, 1996, 1998, 1999, 2001, 2002
   3    Free Software Foundation, Inc.
   4    The structure of this file is based on trad-core.c written by John Gilmore
   5    of Cygnus Support.
   6    Modified to work with the ptrace_user structure by Kevin A. Buettner.
   7    (Longterm it may be better to merge this file with trad-core.c)
   8
   9 This file is part of BFD, the Binary File Descriptor library.
  10
  11 This program is free software; you can redistribute it and/or modify
  12 it under the terms of the GNU General Public License as published by
  13 the Free Software Foundation; either version 2 of the License, or
  14 (at your option) any later version.
  15
  16 This program is distributed in the hope that it will be useful,
  17 but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 GNU General Public License for more details.
  20
  21 You should have received a copy of the GNU General Public License
  22 along with this program; if not, write to the Free Software
  23 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  24
  25 #ifdef PTRACE_CORE
  26
  27 #include "bfd.h"
  28 #include "sysdep.h"
  29 #include "libbfd.h"
  30
  31 #include <sys/param.h>
  32 #include <sys/dir.h>
  33 #include <signal.h>
  34 #include <sys/ptrace.h>
  35
  36 struct trad_core_struct
  37   {
  38     asection *data_section;
  39     asection *stack_section;
  40     asection *reg_section;
  41     struct ptrace_user u;
  42   };
  43
  44 #define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u))
  45 #define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section)
  46 #define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section)
  47 #define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section)
  48
  49 /* forward declarations */
  50
  51 const bfd_target *ptrace_unix_core_file_p PARAMS ((bfd *abfd));
  52 char *          ptrace_unix_core_file_failing_command PARAMS ((bfd *abfd));
  53 int             ptrace_unix_core_file_failing_signal PARAMS ((bfd *abfd));
  54 boolean         ptrace_unix_core_file_matches_executable_p
  55                          PARAMS ((bfd *core_bfd, bfd *exec_bfd));
  56 static void     swap_abort PARAMS ((void));
  57
  58 /* ARGSUSED */
  59 const bfd_target *
  60 ptrace_unix_core_file_p (abfd)
  61      bfd *abfd;
  62
  63 {
  64   int val;
  65   struct ptrace_user u;
  66   struct trad_core_struct *rawptr;
  67   bfd_size_type amt;
  68
  69   val = bfd_bread ((void *)&u, (bfd_size_type) sizeof u, abfd);
  70   if (val != sizeof u || u.pt_magic != _BCS_PTRACE_MAGIC
  71       || u.pt_rev != _BCS_PTRACE_REV)
  72     {
  73       /* Too small to be a core file */
  74       bfd_set_error (bfd_error_wrong_format);
  75       return 0;
  76     }
  77
  78   /* OK, we believe you.  You're a core file (sure, sure).  */
  79
  80   /* Allocate both the upage and the struct core_data at once, so
  81      a single free() will free them both.  */
  82   amt = sizeof (struct trad_core_struct);
  83   rawptr = (struct trad_core_struct *) bfd_zalloc (abfd, amt);
  84
  85   if (rawptr == NULL)
  86     return 0;
  87
  88   abfd->tdata.trad_core_data = rawptr;
  89
  90   rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
  91
  92   /* Create the sections.  */
  93
  94   core_stacksec (abfd) = bfd_make_section_anyway (abfd, ".stack");
  95   if (core_stacksec (abfd) == NULL)
  96     goto fail;
  97   core_datasec (abfd) = bfd_make_section_anyway (abfd, ".data");
  98   if (core_datasec (abfd) == NULL)
  99     goto fail;
 100   core_regsec (abfd) = bfd_make_section_anyway (abfd, ".reg");
 101   if (core_regsec (abfd) == NULL)
 102     goto fail;
 103
 104   /* FIXME:  Need to worry about shared memory, library data, and library
 105      text.  I don't think that any of these things are supported on the
 106      system on which I am developing this for though.  */
 107
 108   core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 109   core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 110   core_regsec (abfd)->flags = SEC_HAS_CONTENTS;
 111
 112   core_datasec (abfd)->_raw_size =  u.pt_dsize;
 113   core_stacksec (abfd)->_raw_size = u.pt_ssize;
 114   core_regsec (abfd)->_raw_size = sizeof (u);
 115
 116   core_datasec (abfd)->vma = u.pt_o_data_start;
 117   core_stacksec (abfd)->vma = USRSTACK - u.pt_ssize;
 118   core_regsec (abfd)->vma = 0 - sizeof (u);     /* see trad-core.c */
 119
 120   core_datasec (abfd)->filepos = (int) u.pt_dataptr;
 121   core_stacksec (abfd)->filepos = (int) (u.pt_dataptr + u.pt_dsize);
 122   core_regsec (abfd)->filepos = 0; /* Register segment is ptrace_user */
 123
 124   /* Align to word at least */
 125   core_stacksec (abfd)->alignment_power = 2;
 126   core_datasec (abfd)->alignment_power = 2;
 127   core_regsec (abfd)->alignment_power = 2;
 128
 129   return abfd->xvec;
 130
 131  fail:
 132   bfd_release (abfd, abfd->tdata.any);
 133   abfd->tdata.any = NULL;
 134   bfd_section_list_clear (abfd);
 135   return NULL;
 136 }
 137
 138 char *
 139 ptrace_unix_core_file_failing_command (abfd)
 140      bfd *abfd;
 141 {
 142   char *com = abfd->tdata.trad_core_data->u.pt_comm;
 143   if (*com)
 144     return com;
 145   else
 146     return 0;
 147 }
 148
 149 /* ARGSUSED */
 150 int
 151 ptrace_unix_core_file_failing_signal (abfd)
 152      bfd *abfd;
 153 {
 154   return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num;
 155 }
 156
 157 /* ARGSUSED */
 158 boolean
 159 ptrace_unix_core_file_matches_executable_p  (core_bfd, exec_bfd)
 160      bfd *core_bfd, *exec_bfd;
 161 {
 162   /* FIXME: Use pt_timdat field of the ptrace_user structure to match
 163      the date of the executable */
 164   return true;
 165 }
 166 \f
 167 /* If somebody calls any byte-swapping routines, shoot them.  */
 168 static void
 169 swap_abort ()
 170 {
 171   abort (); /* This way doesn't require any declaration for ANSI to fuck up */
 172 }
 173 #define NO_GET  ((bfd_vma (*) PARAMS ((   const bfd_byte *))) swap_abort )
 174 #define NO_PUT  ((void    (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort )
 175 #define NO_SIGNED_GET \
 176   ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort )
 177
 178 const bfd_target ptrace_core_vec =
 179   {
 180     "trad-core",
 181     bfd_target_unknown_flavour,
 182     BFD_ENDIAN_UNKNOWN,         /* target byte order */
 183     BFD_ENDIAN_UNKNOWN,         /* target headers byte order */
 184     (HAS_RELOC | EXEC_P |       /* object flags */
 185      HAS_LINENO | HAS_DEBUG |
 186      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 187     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 188     0,                                                     /* symbol prefix */
 189     ' ',                                                   /* ar_pad_char */
 190     16,                                                    /* ar_max_namelen */
 191     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit data */
 192     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit data */
 193     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit data */
 194     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit hdrs */
 195     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit hdrs */
 196     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit hdrs */
 197
 198     {                           /* bfd_check_format */
 199      _bfd_dummy_target,         /* unknown format */
 200      _bfd_dummy_target,         /* object file */
 201      _bfd_dummy_target,         /* archive */
 202      ptrace_unix_core_file_p    /* a core file */
 203     },
 204     {                           /* bfd_set_format */
 205      bfd_false, bfd_false,
 206      bfd_false, bfd_false
 207     },
 208     {                           /* bfd_write_contents */
 209      bfd_false, bfd_false,
 210      bfd_false, bfd_false
 211     },
 212
 213        BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 214        BFD_JUMP_TABLE_COPY (_bfd_generic),
 215        BFD_JUMP_TABLE_CORE (ptrace_unix),
 216        BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 217        BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 218        BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 219        BFD_JUMP_TABLE_WRITE (_bfd_generic),
 220        BFD_JUMP_TABLE_LINK (_bfd_nolink),
 221        BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 222
 223     NULL,
 224
 225     (PTR) 0                     /* backend_data */
 226 };
 227
 228 #endif /* PTRACE_CORE */