bfd/ptrace-core.c

   1 /* BFD backend for core files which use the ptrace_user structure
   2    Copyright 1993, 94, 95, 96, 1998 Free Software Foundation, Inc.
   3    The structure of this file is based on trad-core.c written by John Gilmore
   4    of Cygnus Support.
   5    Modified to work with the ptrace_user structure by Kevin A. Buettner.
   6    (Longterm it may be better to merge this file with trad-core.c)
   7
   8 This file is part of BFD, the Binary File Descriptor library.
   9
  10 This program is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 2 of the License, or
  13 (at your option) any later version.
  14
  15 This program is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with this program; if not, write to the Free Software
  22 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  23
  24 #ifdef PTRACE_CORE
  25
  26 #include "bfd.h"
  27 #include "sysdep.h"
  28 #include "libbfd.h"
  29
  30 #include <sys/param.h>
  31 #include <sys/dir.h>
  32 #include <signal.h>
  33 #include <sys/ptrace.h>
  34
  35 struct trad_core_struct
  36   {
  37     asection *data_section;
  38     asection *stack_section;
  39     asection *reg_section;
  40     struct ptrace_user u;
  41   };
  42
  43 #define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u))
  44 #define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section)
  45 #define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section)
  46 #define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section)
  47
  48 /* forward declarations */
  49
  50 const bfd_target *ptrace_unix_core_file_p PARAMS ((bfd *abfd));
  51 char *          ptrace_unix_core_file_failing_command PARAMS ((bfd *abfd));
  52 int             ptrace_unix_core_file_failing_signal PARAMS ((bfd *abfd));
  53 boolean         ptrace_unix_core_file_matches_executable_p
  54                          PARAMS ((bfd *core_bfd, bfd *exec_bfd));
  55 static void     swap_abort PARAMS ((void));
  56
  57 /* ARGSUSED */
  58 const bfd_target *
  59 ptrace_unix_core_file_p (abfd)
  60      bfd *abfd;
  61
  62 {
  63   int val;
  64   struct ptrace_user u;
  65   struct trad_core_struct *rawptr;
  66
  67   val = bfd_read ((void *)&u, 1, sizeof u, abfd);
  68   if (val != sizeof u || u.pt_magic != _BCS_PTRACE_MAGIC
  69       || u.pt_rev != _BCS_PTRACE_REV)
  70     {
  71       /* Too small to be a core file */
  72       bfd_set_error (bfd_error_wrong_format);
  73       return 0;
  74     }
  75
  76   /* OK, we believe you.  You're a core file (sure, sure).  */
  77
  78   /* Allocate both the upage and the struct core_data at once, so
  79      a single free() will free them both.  */
  80   rawptr = (struct trad_core_struct *)
  81                 bfd_zalloc (abfd, sizeof (struct trad_core_struct));
  82
  83   if (rawptr == NULL)
  84     return 0;
  85
  86   abfd->tdata.trad_core_data = rawptr;
  87
  88   rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
  89
  90   /* Create the sections.  This is raunchy, but bfd_close wants to free
  91      them separately.  */
  92
  93   core_stacksec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection));
  94   if (core_stacksec (abfd) == NULL)
  95     return NULL;
  96   core_datasec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection));
  97   if (core_datasec (abfd) == NULL)
  98     return NULL;
  99   core_regsec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection));
 100   if (core_regsec (abfd) == NULL)
 101     return NULL;
 102
 103   core_stacksec (abfd)->name = ".stack";
 104   core_datasec (abfd)->name = ".data";
 105   core_regsec (abfd)->name = ".reg";
 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_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 112   core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 113   core_regsec (abfd)->flags = SEC_HAS_CONTENTS;
 114
 115   core_datasec (abfd)->_raw_size =  u.pt_dsize;
 116   core_stacksec (abfd)->_raw_size = u.pt_ssize;
 117   core_regsec (abfd)->_raw_size = sizeof (u);
 118
 119   core_datasec (abfd)->vma = u.pt_o_data_start;
 120   core_stacksec (abfd)->vma = USRSTACK - u.pt_ssize;
 121   core_regsec (abfd)->vma = 0 - sizeof (u);     /* see trad-core.c */
 122
 123   core_datasec (abfd)->filepos = (int) u.pt_dataptr;
 124   core_stacksec (abfd)->filepos = (int) (u.pt_dataptr + u.pt_dsize);
 125   core_regsec (abfd)->filepos = 0; /* Register segment is ptrace_user */
 126
 127   /* Align to word at least */
 128   core_stacksec (abfd)->alignment_power = 2;
 129   core_datasec (abfd)->alignment_power = 2;
 130   core_regsec (abfd)->alignment_power = 2;
 131
 132   abfd->sections = core_stacksec (abfd);
 133   core_stacksec (abfd)->next = core_datasec (abfd);
 134   core_datasec (abfd)->next = core_regsec (abfd);
 135   abfd->section_count = 3;
 136
 137   return abfd->xvec;
 138 }
 139
 140 char *
 141 ptrace_unix_core_file_failing_command (abfd)
 142      bfd *abfd;
 143 {
 144   char *com = abfd->tdata.trad_core_data->u.pt_comm;
 145   if (*com)
 146     return com;
 147   else
 148     return 0;
 149 }
 150
 151 /* ARGSUSED */
 152 int
 153 ptrace_unix_core_file_failing_signal (abfd)
 154      bfd *abfd;
 155 {
 156   return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num;
 157 }
 158
 159 /* ARGSUSED */
 160 boolean
 161 ptrace_unix_core_file_matches_executable_p  (core_bfd, exec_bfd)
 162      bfd *core_bfd, *exec_bfd;
 163 {
 164   /* FIXME: Use pt_timdat field of the ptrace_user structure to match
 165      the date of the executable */
 166   return true;
 167 }
 168 \f
 169 /* If somebody calls any byte-swapping routines, shoot them.  */
 170 static void
 171 swap_abort ()
 172 {
 173   abort (); /* This way doesn't require any declaration for ANSI to fuck up */
 174 }
 175 #define NO_GET  ((bfd_vma (*) PARAMS ((   const bfd_byte *))) swap_abort )
 176 #define NO_PUT  ((void    (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort )
 177 #define NO_SIGNED_GET \
 178   ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort )
 179
 180 const bfd_target ptrace_core_vec =
 181   {
 182     "trad-core",
 183     bfd_target_unknown_flavour,
 184     BFD_ENDIAN_UNKNOWN,         /* target byte order */
 185     BFD_ENDIAN_UNKNOWN,         /* target headers byte order */
 186     (HAS_RELOC | EXEC_P |       /* object flags */
 187      HAS_LINENO | HAS_DEBUG |
 188      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 189     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 190     0,                                                     /* symbol prefix */
 191     ' ',                                                   /* ar_pad_char */
 192     16,                                                    /* ar_max_namelen */
 193     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit data */
 194     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit data */
 195     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit data */
 196     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit hdrs */
 197     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit hdrs */
 198     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit hdrs */
 199
 200     {                           /* bfd_check_format */
 201      _bfd_dummy_target,         /* unknown format */
 202      _bfd_dummy_target,         /* object file */
 203      _bfd_dummy_target,         /* archive */
 204      ptrace_unix_core_file_p    /* a core file */
 205     },
 206     {                           /* bfd_set_format */
 207      bfd_false, bfd_false,
 208      bfd_false, bfd_false
 209     },
 210     {                           /* bfd_write_contents */
 211      bfd_false, bfd_false,
 212      bfd_false, bfd_false
 213     },
 214
 215        BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 216        BFD_JUMP_TABLE_COPY (_bfd_generic),
 217        BFD_JUMP_TABLE_CORE (ptrace_unix),
 218        BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 219        BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 220        BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 221        BFD_JUMP_TABLE_WRITE (_bfd_generic),
 222        BFD_JUMP_TABLE_LINK (_bfd_nolink),
 223        BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 224
 225     NULL,
 226
 227     (PTR) 0                     /* backend_data */
 228 };
 229
 230 #endif /* PTRACE_CORE */