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,
   3    2006, 2007  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 3 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,
  24    MA 02110-1301, USA.  */
  25
  26 #ifdef PTRACE_CORE
  27
  28 #include "sysdep.h"
  29 #include "bfd.h"
  30 #include "libbfd.h"
  31
  32 #include <sys/param.h>
  33 #include <sys/dir.h>
  34 #include <signal.h>
  35 #include <sys/ptrace.h>
  36
  37 struct trad_core_struct
  38   {
  39     asection *data_section;
  40     asection *stack_section;
  41     asection *reg_section;
  42     struct ptrace_user u;
  43   };
  44
  45 #define core_upage(bfd) (&((bfd)->tdata.trad_core_data->u))
  46 #define core_datasec(bfd) ((bfd)->tdata.trad_core_data->data_section)
  47 #define core_stacksec(bfd) ((bfd)->tdata.trad_core_data->stack_section)
  48 #define core_regsec(bfd) ((bfd)->tdata.trad_core_data->reg_section)
  49
  50 /* forward declarations */
  51
  52 const bfd_target *ptrace_unix_core_file_p PARAMS ((bfd *abfd));
  53 char * ptrace_unix_core_file_failing_command PARAMS ((bfd *abfd));
  54 int ptrace_unix_core_file_failing_signal PARAMS ((bfd *abfd));
  55 #define ptrace_unix_core_file_matches_executable_p generic_core_file_matches_executable_p
  56 static void swap_abort PARAMS ((void));
  57
  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   bfd_size_type amt;
  67   flagword flags;
  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   flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
  95   core_stacksec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack",
  96                                                              flags);
  97   if (core_stacksec (abfd) == NULL)
  98     goto fail;
  99   core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data",
 100                                                             flags);
 101   if (core_datasec (abfd) == NULL)
 102     goto fail;
 103   core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg",
 104                                                            SEC_HAS_CONTENTS);
 105   if (core_regsec (abfd) == NULL)
 106     goto fail;
 107
 108   /* FIXME:  Need to worry about shared memory, library data, and library
 109      text.  I don't think that any of these things are supported on the
 110      system on which I am developing this for though.  */
 111
 112   core_datasec (abfd)->size =  u.pt_dsize;
 113   core_stacksec (abfd)->size = u.pt_ssize;
 114   core_regsec (abfd)->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 int
 150 ptrace_unix_core_file_failing_signal (abfd)
 151      bfd *abfd;
 152 {
 153   return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num;
 154 }
 155 \f
 156 /* If somebody calls any byte-swapping routines, shoot them.  */
 157 static void
 158 swap_abort ()
 159 {
 160   abort (); /* This way doesn't require any declaration for ANSI to fuck up */
 161 }
 162
 163 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
 164 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
 165 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
 166 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
 167 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
 168 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
 169
 170 const bfd_target ptrace_core_vec =
 171   {
 172     "trad-core",
 173     bfd_target_unknown_flavour,
 174     BFD_ENDIAN_UNKNOWN,         /* target byte order */
 175     BFD_ENDIAN_UNKNOWN,         /* target headers byte order */
 176     (HAS_RELOC | EXEC_P |       /* object flags */
 177      HAS_LINENO | HAS_DEBUG |
 178      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 179     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 180     0,                                                     /* symbol prefix */
 181     ' ',                                                   /* ar_pad_char */
 182     16,                                                    /* ar_max_namelen */
 183     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit data */
 184     NO_GET, NO_GETS, NO_PUT,            /* 32 bit data */
 185     NO_GET, NO_GETS, NO_PUT,            /* 16 bit data */
 186     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit hdrs */
 187     NO_GET, NO_GETS, NO_PUT,            /* 32 bit hdrs */
 188     NO_GET, NO_GETS, NO_PUT,            /* 16 bit hdrs */
 189
 190     {                           /* bfd_check_format */
 191       _bfd_dummy_target,                /* unknown format */
 192       _bfd_dummy_target,                /* object file */
 193       _bfd_dummy_target,                /* archive */
 194       ptrace_unix_core_file_p           /* a core file */
 195     },
 196     {                           /* bfd_set_format */
 197       bfd_false, bfd_false,
 198       bfd_false, bfd_false
 199     },
 200     {                           /* bfd_write_contents */
 201       bfd_false, bfd_false,
 202       bfd_false, bfd_false
 203     },
 204
 205     BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 206     BFD_JUMP_TABLE_COPY (_bfd_generic),
 207     BFD_JUMP_TABLE_CORE (ptrace_unix),
 208     BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 209     BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 210     BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 211     BFD_JUMP_TABLE_WRITE (_bfd_generic),
 212     BFD_JUMP_TABLE_LINK (_bfd_nolink),
 213     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 214
 215     NULL,
 216
 217     (PTR) 0                     /* backend_data */
 218   };
 219
 220 #endif /* PTRACE_CORE */