bfd/ptrace-core.c

   1 /* BFD backend for core files which use the ptrace_user structure
   2    Copyright 1993, 1994 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 <stdio.h>
  31 #include <sys/types.h>
  32 #include <sys/param.h>
  33 #include <sys/dir.h>
  34 #include <signal.h>
  35 #include <errno.h>
  36 #include <unistd.h>
  37 #include <sys/ptrace.h>
  38
  39
  40 struct trad_core_struct
  41   {
  42     asection *data_section;
  43     asection *stack_section;
  44     asection *reg_section;
  45     struct ptrace_user u;
  46   };
  47
  48 #define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u))
  49 #define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section)
  50 #define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section)
  51 #define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section)
  52
  53 /* forward declarations */
  54
  55 const bfd_target *ptrace_unix_core_file_p PARAMS ((bfd *abfd));
  56 char *          ptrace_unix_core_file_failing_command PARAMS ((bfd *abfd));
  57 int             ptrace_unix_core_file_failing_signal PARAMS ((bfd *abfd));
  58 boolean         ptrace_unix_core_file_matches_executable_p
  59                          PARAMS ((bfd *core_bfd, bfd *exec_bfd));
  60
  61 /* ARGSUSED */
  62 const bfd_target *
  63 ptrace_unix_core_file_p (abfd)
  64      bfd *abfd;
  65
  66 {
  67   int val;
  68   struct ptrace_user u;
  69   struct trad_core_struct *rawptr;
  70
  71   val = bfd_read ((void *)&u, 1, sizeof u, abfd);
  72   if (val != sizeof u || u.pt_magic != _BCS_PTRACE_MAGIC
  73       || u.pt_rev != _BCS_PTRACE_REV)
  74     {
  75       /* Too small to be a core file */
  76       bfd_set_error (bfd_error_wrong_format);
  77       return 0;
  78     }
  79
  80   /* OK, we believe you.  You're a core file (sure, sure).  */
  81
  82   /* Allocate both the upage and the struct core_data at once, so
  83      a single free() will free them both.  */
  84   rawptr = (struct trad_core_struct *)
  85                 bfd_zalloc (abfd, sizeof (struct trad_core_struct));
  86
  87   if (rawptr == NULL)
  88     return 0;
  89
  90   abfd->tdata.trad_core_data = rawptr;
  91
  92   rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
  93
  94   /* Create the sections.  This is raunchy, but bfd_close wants to free
  95      them separately.  */
  96
  97   core_stacksec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection));
  98   if (core_stacksec (abfd) == NULL)
  99     return NULL;
 100   core_datasec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection));
 101   if (core_datasec (abfd) == NULL)
 102     return NULL;
 103   core_regsec (abfd) = (asection *) bfd_zalloc (abfd, sizeof (asection));
 104   if (core_regsec (abfd) == NULL)
 105     return NULL;
 106
 107   core_stacksec (abfd)->name = ".stack";
 108   core_datasec (abfd)->name = ".data";
 109   core_regsec (abfd)->name = ".reg";
 110
 111   /* FIXME:  Need to worry about shared memory, library data, and library
 112      text.  I don't think that any of these things are supported on the
 113      system on which I am developing this for though. */
 114
 115
 116   core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 117   core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 118   core_regsec (abfd)->flags = SEC_HAS_CONTENTS;
 119
 120   core_datasec (abfd)->_raw_size =  u.pt_dsize;
 121   core_stacksec (abfd)->_raw_size = u.pt_ssize;
 122   core_regsec (abfd)->_raw_size = sizeof(u);
 123
 124   core_datasec (abfd)->vma = u.pt_o_data_start;
 125   core_stacksec (abfd)->vma = USRSTACK - u.pt_ssize;
 126   core_regsec (abfd)->vma = 0 - sizeof(u);      /* see trad-core.c */
 127
 128   core_datasec (abfd)->filepos = (int) u.pt_dataptr;
 129   core_stacksec (abfd)->filepos = (int) (u.pt_dataptr + u.pt_dsize);
 130   core_regsec (abfd)->filepos = 0; /* Register segment is ptrace_user */
 131
 132   /* Align to word at least */
 133   core_stacksec (abfd)->alignment_power = 2;
 134   core_datasec (abfd)->alignment_power = 2;
 135   core_regsec (abfd)->alignment_power = 2;
 136
 137   abfd->sections = core_stacksec (abfd);
 138   core_stacksec (abfd)->next = core_datasec (abfd);
 139   core_datasec (abfd)->next = core_regsec (abfd);
 140   abfd->section_count = 3;
 141
 142   return abfd->xvec;
 143 }
 144
 145 char *
 146 ptrace_unix_core_file_failing_command (abfd)
 147      bfd *abfd;
 148 {
 149   char *com = abfd->tdata.trad_core_data->u.pt_comm;
 150   if (*com)
 151     return com;
 152   else
 153     return 0;
 154 }
 155
 156 /* ARGSUSED */
 157 int
 158 ptrace_unix_core_file_failing_signal (abfd)
 159      bfd *abfd;
 160 {
 161   return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num;
 162 }
 163
 164 /* ARGSUSED */
 165 boolean
 166 ptrace_unix_core_file_matches_executable_p  (core_bfd, exec_bfd)
 167      bfd *core_bfd, *exec_bfd;
 168 {
 169   /* FIXME: Use pt_timdat field of the ptrace_user structure to match
 170      the date of the executable */
 171   return true;
 172 }
 173 \f
 174 /* If somebody calls any byte-swapping routines, shoot them.  */
 175 void
 176 swap_abort()
 177 {
 178   abort(); /* This way doesn't require any declaration for ANSI to fuck up */
 179 }
 180 #define NO_GET  ((bfd_vma (*) PARAMS ((   const bfd_byte *))) swap_abort )
 181 #define NO_PUT  ((void    (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort )
 182 #define NO_SIGNED_GET \
 183   ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort )
 184
 185 const bfd_target ptrace_core_vec =
 186   {
 187     "trad-core",
 188     bfd_target_unknown_flavour,
 189     true,                       /* target byte order */
 190     true,                       /* target headers byte order */
 191     (HAS_RELOC | EXEC_P |       /* object flags */
 192      HAS_LINENO | HAS_DEBUG |
 193      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 194     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 195     0,                                                     /* symbol prefix */
 196     ' ',                                                   /* ar_pad_char */
 197     16,                                                    /* ar_max_namelen */
 198     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit data */
 199     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit data */
 200     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit data */
 201     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit hdrs */
 202     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit hdrs */
 203     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit hdrs */
 204
 205     {                           /* bfd_check_format */
 206      _bfd_dummy_target,         /* unknown format */
 207      _bfd_dummy_target,         /* object file */
 208      _bfd_dummy_target,         /* archive */
 209      ptrace_unix_core_file_p    /* a core file */
 210     },
 211     {                           /* bfd_set_format */
 212      bfd_false, bfd_false,
 213      bfd_false, bfd_false
 214     },
 215     {                           /* bfd_write_contents */
 216      bfd_false, bfd_false,
 217      bfd_false, bfd_false
 218     },
 219
 220        BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 221        BFD_JUMP_TABLE_COPY (_bfd_generic),
 222        BFD_JUMP_TABLE_CORE (ptrace_unix),
 223        BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 224        BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 225        BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 226        BFD_JUMP_TABLE_WRITE (_bfd_generic),
 227        BFD_JUMP_TABLE_LINK (_bfd_nolink),
 228        BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 229
 230     (PTR) 0                     /* backend_data */
 231 };
 232
 233 #endif /* PTRACE_CORE */