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, 2003, 2004, 2006
   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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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 #define ptrace_unix_core_file_matches_executable_p generic_core_file_matches_executable_p
  55 static void swap_abort PARAMS ((void));
  56
  57 const bfd_target *
  58 ptrace_unix_core_file_p (abfd)
  59      bfd *abfd;
  60
  61 {
  62   int val;
  63   struct ptrace_user u;
  64   struct trad_core_struct *rawptr;
  65   bfd_size_type amt;
  66   flagword flags;
  67
  68   val = bfd_bread ((void *)&u, (bfd_size_type) sizeof u, abfd);
  69   if (val != sizeof u || u.pt_magic != _BCS_PTRACE_MAGIC
  70       || u.pt_rev != _BCS_PTRACE_REV)
  71     {
  72       /* Too small to be a core file */
  73       bfd_set_error (bfd_error_wrong_format);
  74       return 0;
  75     }
  76
  77   /* OK, we believe you.  You're a core file (sure, sure).  */
  78
  79   /* Allocate both the upage and the struct core_data at once, so
  80      a single free() will free them both.  */
  81   amt = sizeof (struct trad_core_struct);
  82   rawptr = (struct trad_core_struct *) bfd_zalloc (abfd, amt);
  83
  84   if (rawptr == NULL)
  85     return 0;
  86
  87   abfd->tdata.trad_core_data = rawptr;
  88
  89   rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
  90
  91   /* Create the sections.  */
  92
  93   flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
  94   core_stacksec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack",
  95                                                              flags);
  96   if (core_stacksec (abfd) == NULL)
  97     goto fail;
  98   core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data",
  99                                                             flags);
 100   if (core_datasec (abfd) == NULL)
 101     goto fail;
 102   core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg",
 103                                                            SEC_HAS_CONTENTS);
 104   if (core_regsec (abfd) == NULL)
 105     goto fail;
 106
 107   /* FIXME:  Need to worry about shared memory, library data, and library
 108      text.  I don't think that any of these things are supported on the
 109      system on which I am developing this for though.  */
 110
 111   core_datasec (abfd)->size =  u.pt_dsize;
 112   core_stacksec (abfd)->size = u.pt_ssize;
 113   core_regsec (abfd)->size = sizeof (u);
 114
 115   core_datasec (abfd)->vma = u.pt_o_data_start;
 116   core_stacksec (abfd)->vma = USRSTACK - u.pt_ssize;
 117   core_regsec (abfd)->vma = 0 - sizeof (u);     /* see trad-core.c */
 118
 119   core_datasec (abfd)->filepos = (int) u.pt_dataptr;
 120   core_stacksec (abfd)->filepos = (int) (u.pt_dataptr + u.pt_dsize);
 121   core_regsec (abfd)->filepos = 0; /* Register segment is ptrace_user */
 122
 123   /* Align to word at least */
 124   core_stacksec (abfd)->alignment_power = 2;
 125   core_datasec (abfd)->alignment_power = 2;
 126   core_regsec (abfd)->alignment_power = 2;
 127
 128   return abfd->xvec;
 129
 130  fail:
 131   bfd_release (abfd, abfd->tdata.any);
 132   abfd->tdata.any = NULL;
 133   bfd_section_list_clear (abfd);
 134   return NULL;
 135 }
 136
 137 char *
 138 ptrace_unix_core_file_failing_command (abfd)
 139      bfd *abfd;
 140 {
 141   char *com = abfd->tdata.trad_core_data->u.pt_comm;
 142   if (*com)
 143     return com;
 144   else
 145     return 0;
 146 }
 147
 148 int
 149 ptrace_unix_core_file_failing_signal (abfd)
 150      bfd *abfd;
 151 {
 152   return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num;
 153 }
 154 \f
 155 /* If somebody calls any byte-swapping routines, shoot them.  */
 156 static void
 157 swap_abort ()
 158 {
 159   abort (); /* This way doesn't require any declaration for ANSI to fuck up */
 160 }
 161
 162 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
 163 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
 164 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
 165 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
 166 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
 167 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
 168
 169 const bfd_target ptrace_core_vec =
 170   {
 171     "trad-core",
 172     bfd_target_unknown_flavour,
 173     BFD_ENDIAN_UNKNOWN,         /* target byte order */
 174     BFD_ENDIAN_UNKNOWN,         /* target headers byte order */
 175     (HAS_RELOC | EXEC_P |       /* object flags */
 176      HAS_LINENO | HAS_DEBUG |
 177      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 178     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 179     0,                                                     /* symbol prefix */
 180     ' ',                                                   /* ar_pad_char */
 181     16,                                                    /* ar_max_namelen */
 182     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit data */
 183     NO_GET, NO_GETS, NO_PUT,            /* 32 bit data */
 184     NO_GET, NO_GETS, NO_PUT,            /* 16 bit data */
 185     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit hdrs */
 186     NO_GET, NO_GETS, NO_PUT,            /* 32 bit hdrs */
 187     NO_GET, NO_GETS, NO_PUT,            /* 16 bit hdrs */
 188
 189     {                           /* bfd_check_format */
 190       _bfd_dummy_target,                /* unknown format */
 191       _bfd_dummy_target,                /* object file */
 192       _bfd_dummy_target,                /* archive */
 193       ptrace_unix_core_file_p           /* a core file */
 194     },
 195     {                           /* bfd_set_format */
 196       bfd_false, bfd_false,
 197       bfd_false, bfd_false
 198     },
 199     {                           /* bfd_write_contents */
 200       bfd_false, bfd_false,
 201       bfd_false, bfd_false
 202     },
 203
 204     BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 205     BFD_JUMP_TABLE_COPY (_bfd_generic),
 206     BFD_JUMP_TABLE_CORE (ptrace_unix),
 207     BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 208     BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 209     BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 210     BFD_JUMP_TABLE_WRITE (_bfd_generic),
 211     BFD_JUMP_TABLE_LINK (_bfd_nolink),
 212     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 213
 214     NULL,
 215
 216     (PTR) 0                     /* backend_data */
 217   };
 218
 219 #endif /* PTRACE_CORE */