bfd/ptrace-core.c

   1 /* BFD backend for core files which use the ptrace_user structure
   2    Copyright 1993 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., 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24    To use this file on a particular host, configure the host with these
  25    parameters in the config/h-HOST file:
  26
  27         HDEFINES=-DPTRACE_CORE
  28         HDEPFILES=ptrace-core.o
  29
  30 */
  31
  32 #ifdef PTRACE_CORE
  33
  34 #include "bfd.h"
  35 #include "sysdep.h"
  36 #include "libbfd.h"
  37
  38 #include <stdio.h>
  39 #include <sys/types.h>
  40 #include <sys/param.h>
  41 #include <sys/dir.h>
  42 #include <signal.h>
  43 #include <errno.h>
  44 #include <unistd.h>
  45 #include <sys/ptrace.h>
  46
  47
  48 struct trad_core_struct
  49   {
  50     asection *data_section;
  51     asection *stack_section;
  52     asection *reg_section;
  53     struct ptrace_user u;
  54   } *rawptr;
  55
  56 #define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u))
  57 #define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section)
  58 #define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section)
  59 #define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section)
  60
  61 /* forward declarations */
  62
  63 bfd_target *    ptrace_unix_core_file_p PARAMS ((bfd *abfd));
  64 char *          ptrace_unix_core_file_failing_command PARAMS ((bfd *abfd));
  65 int             ptrace_unix_core_file_failing_signal PARAMS ((bfd *abfd));
  66 boolean         ptrace_unix_core_file_matches_executable_p
  67                          PARAMS ((bfd *core_bfd, bfd *exec_bfd));
  68
  69 /* ARGSUSED */
  70 bfd_target *
  71 ptrace_unix_core_file_p (abfd)
  72      bfd *abfd;
  73
  74 {
  75   int val;
  76   struct ptrace_user u;
  77
  78   val = bfd_read ((void *)&u, 1, sizeof u, abfd);
  79   if (val != sizeof u || u.pt_magic != _BCS_PTRACE_MAGIC
  80       || u.pt_rev != _BCS_PTRACE_REV)
  81     {
  82       /* Too small to be a core file */
  83       bfd_set_error (bfd_error_wrong_format);
  84       return 0;
  85     }
  86
  87   /* OK, we believe you.  You're a core file (sure, sure).  */
  88
  89   /* Allocate both the upage and the struct core_data at once, so
  90      a single free() will free them both.  */
  91   rawptr = (struct trad_core_struct *)
  92                 bfd_zalloc (abfd, sizeof (struct trad_core_struct));
  93
  94   if (rawptr == NULL) {
  95     bfd_set_error (bfd_error_no_memory);
  96     return 0;
  97   }
  98
  99   abfd->tdata.trad_core_data = rawptr;
 100
 101   rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
 102
 103   /* Create the sections.  This is raunchy, but bfd_close wants to free
 104      them separately.  */
 105
 106   core_stacksec(abfd) = (asection *) bfd_zmalloc (sizeof (asection));
 107   if (core_stacksec (abfd) == NULL) {
 108   loser:
 109     bfd_set_error (bfd_error_no_memory);
 110     free ((void *)rawptr);
 111     return 0;
 112   }
 113   core_datasec (abfd) = (asection *) zalloc (sizeof (asection));
 114   if (core_datasec (abfd) == NULL) {
 115   loser1:
 116     free ((void *)core_stacksec (abfd));
 117     goto loser;
 118   }
 119   core_regsec (abfd) = (asection *) zalloc (sizeof (asection));
 120   if (core_regsec (abfd) == NULL) {
 121     free ((void *)core_datasec (abfd));
 122     goto loser1;
 123   }
 124
 125   core_stacksec (abfd)->name = ".stack";
 126   core_datasec (abfd)->name = ".data";
 127   core_regsec (abfd)->name = ".reg";
 128
 129   /* FIXME:  Need to worry about shared memory, library data, and library
 130      text.  I don't think that any of these things are supported on the
 131      system on which I am developing this for though. */
 132
 133
 134   core_stacksec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 135   core_datasec (abfd)->flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
 136   core_regsec (abfd)->flags = SEC_ALLOC + SEC_HAS_CONTENTS;
 137
 138   core_datasec (abfd)->_raw_size =  u.pt_dsize;
 139   core_stacksec (abfd)->_raw_size = u.pt_ssize;
 140   core_regsec (abfd)->_raw_size = sizeof(u);
 141
 142   core_datasec (abfd)->vma = u.pt_o_data_start;
 143   core_stacksec (abfd)->vma = USRSTACK - u.pt_ssize;
 144   core_regsec (abfd)->vma = 0 - sizeof(u);      /* see trad-core.c */
 145
 146   core_datasec (abfd)->filepos = (int) u.pt_dataptr;
 147   core_stacksec (abfd)->filepos = (int) (u.pt_dataptr + u.pt_dsize);
 148   core_regsec (abfd)->filepos = 0; /* Register segment is ptrace_user */
 149
 150   /* Align to word at least */
 151   core_stacksec (abfd)->alignment_power = 2;
 152   core_datasec (abfd)->alignment_power = 2;
 153   core_regsec (abfd)->alignment_power = 2;
 154
 155   abfd->sections = core_stacksec (abfd);
 156   core_stacksec (abfd)->next = core_datasec (abfd);
 157   core_datasec (abfd)->next = core_regsec (abfd);
 158   abfd->section_count = 3;
 159
 160   return abfd->xvec;
 161 }
 162
 163 char *
 164 ptrace_unix_core_file_failing_command (abfd)
 165      bfd *abfd;
 166 {
 167   char *com = abfd->tdata.trad_core_data->u.pt_comm;
 168   if (*com)
 169     return com;
 170   else
 171     return 0;
 172 }
 173
 174 /* ARGSUSED */
 175 int
 176 ptrace_unix_core_file_failing_signal (abfd)
 177      bfd *abfd;
 178 {
 179   return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num;
 180 }
 181
 182 /* ARGSUSED */
 183 boolean
 184 ptrace_unix_core_file_matches_executable_p  (core_bfd, exec_bfd)
 185      bfd *core_bfd, *exec_bfd;
 186 {
 187   /* FIXME: Use pt_timdat field of the ptrace_user structure to match
 188      the date of the executable */
 189   return true;
 190 }
 191 \f
 192 /* If somebody calls any byte-swapping routines, shoot them.  */
 193 void
 194 swap_abort()
 195 {
 196   abort(); /* This way doesn't require any declaration for ANSI to fuck up */
 197 }
 198 #define NO_GET  ((bfd_vma (*) PARAMS ((   const bfd_byte *))) swap_abort )
 199 #define NO_PUT  ((void    (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort )
 200 #define NO_SIGNED_GET \
 201   ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort )
 202
 203 bfd_target ptrace_core_vec =
 204   {
 205     "trad-core",
 206     bfd_target_unknown_flavour,
 207     true,                       /* target byte order */
 208     true,                       /* target headers byte order */
 209     (HAS_RELOC | EXEC_P |       /* object flags */
 210      HAS_LINENO | HAS_DEBUG |
 211      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 212     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 213     0,                                                     /* symbol prefix */
 214     ' ',                                                   /* ar_pad_char */
 215     16,                                                    /* ar_max_namelen */
 216     3,                                                     /* minimum alignment power */
 217     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit data */
 218     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit data */
 219     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit data */
 220     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit hdrs */
 221     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit hdrs */
 222     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit hdrs */
 223
 224     {                           /* bfd_check_format */
 225      _bfd_dummy_target,         /* unknown format */
 226      _bfd_dummy_target,         /* object file */
 227      _bfd_dummy_target,         /* archive */
 228      ptrace_unix_core_file_p    /* a core file */
 229     },
 230     {                           /* bfd_set_format */
 231      bfd_false, bfd_false,
 232      bfd_false, bfd_false
 233     },
 234     {                           /* bfd_write_contents */
 235      bfd_false, bfd_false,
 236      bfd_false, bfd_false
 237     },
 238
 239        BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 240        BFD_JUMP_TABLE_COPY (_bfd_generic),
 241        BFD_JUMP_TABLE_CORE (ptrace_unix),
 242        BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 243        BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 244        BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 245        BFD_JUMP_TABLE_WRITE (_bfd_generic),
 246        BFD_JUMP_TABLE_LINK (_bfd_nolink),
 247
 248     (PTR) 0                     /* backend_data */
 249 };
 250
 251 #endif /* PTRACE_CORE */