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    2005, 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 #define ptrace_unix_core_file_pid _bfd_nocore_core_file_pid
  57 static void swap_abort PARAMS ((void));
  58
  59 const bfd_target *
  60 ptrace_unix_core_file_p (abfd)
  61      bfd *abfd;
  62
  63 {
  64   int val;
  65   struct ptrace_user u;
  66   struct trad_core_struct *rawptr;
  67   bfd_size_type amt;
  68   flagword flags;
  69
  70   val = bfd_bread ((void *)&u, (bfd_size_type) sizeof u, abfd);
  71   if (val != sizeof u || u.pt_magic != _BCS_PTRACE_MAGIC
  72       || u.pt_rev != _BCS_PTRACE_REV)
  73     {
  74       /* Too small to be a core file */
  75       bfd_set_error (bfd_error_wrong_format);
  76       return 0;
  77     }
  78
  79   /* OK, we believe you.  You're a core file (sure, sure).  */
  80
  81   /* Allocate both the upage and the struct core_data at once, so
  82      a single free() will free them both.  */
  83   amt = sizeof (struct trad_core_struct);
  84   rawptr = (struct trad_core_struct *) bfd_zalloc (abfd, amt);
  85
  86   if (rawptr == NULL)
  87     return 0;
  88
  89   abfd->tdata.trad_core_data = rawptr;
  90
  91   rawptr->u = u; /*Copy the uarea into the tdata part of the bfd */
  92
  93   /* Create the sections.  */
  94
  95   flags = SEC_ALLOC + SEC_LOAD + SEC_HAS_CONTENTS;
  96   core_stacksec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".stack",
  97                                                              flags);
  98   if (core_stacksec (abfd) == NULL)
  99     goto fail;
 100   core_datasec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".data",
 101                                                             flags);
 102   if (core_datasec (abfd) == NULL)
 103     goto fail;
 104   core_regsec (abfd) = bfd_make_section_anyway_with_flags (abfd, ".reg",
 105                                                            SEC_HAS_CONTENTS);
 106   if (core_regsec (abfd) == NULL)
 107     goto fail;
 108
 109   /* FIXME:  Need to worry about shared memory, library data, and library
 110      text.  I don't think that any of these things are supported on the
 111      system on which I am developing this for though.  */
 112
 113   core_datasec (abfd)->size =  u.pt_dsize;
 114   core_stacksec (abfd)->size = u.pt_ssize;
 115   core_regsec (abfd)->size = sizeof (u);
 116
 117   core_datasec (abfd)->vma = u.pt_o_data_start;
 118   core_stacksec (abfd)->vma = USRSTACK - u.pt_ssize;
 119   core_regsec (abfd)->vma = 0 - sizeof (u);     /* see trad-core.c */
 120
 121   core_datasec (abfd)->filepos = (int) u.pt_dataptr;
 122   core_stacksec (abfd)->filepos = (int) (u.pt_dataptr + u.pt_dsize);
 123   core_regsec (abfd)->filepos = 0; /* Register segment is ptrace_user */
 124
 125   /* Align to word at least */
 126   core_stacksec (abfd)->alignment_power = 2;
 127   core_datasec (abfd)->alignment_power = 2;
 128   core_regsec (abfd)->alignment_power = 2;
 129
 130   return abfd->xvec;
 131
 132  fail:
 133   bfd_release (abfd, abfd->tdata.any);
 134   abfd->tdata.any = NULL;
 135   bfd_section_list_clear (abfd);
 136   return NULL;
 137 }
 138
 139 char *
 140 ptrace_unix_core_file_failing_command (abfd)
 141      bfd *abfd;
 142 {
 143   char *com = abfd->tdata.trad_core_data->u.pt_comm;
 144   if (*com)
 145     return com;
 146   else
 147     return 0;
 148 }
 149
 150 int
 151 ptrace_unix_core_file_failing_signal (abfd)
 152      bfd *abfd;
 153 {
 154   return abfd->tdata.trad_core_data->u.pt_sigframe.sig_num;
 155 }
 156 \f
 157 /* If somebody calls any byte-swapping routines, shoot them.  */
 158 static void
 159 swap_abort ()
 160 {
 161   abort (); /* This way doesn't require any declaration for ANSI to fuck up */
 162 }
 163
 164 #define NO_GET ((bfd_vma (*) (const void *)) swap_abort)
 165 #define NO_PUT ((void (*) (bfd_vma, void *)) swap_abort)
 166 #define NO_GETS ((bfd_signed_vma (*) (const void *)) swap_abort)
 167 #define NO_GET64 ((bfd_uint64_t (*) (const void *)) swap_abort)
 168 #define NO_PUT64 ((void (*) (bfd_uint64_t, void *)) swap_abort)
 169 #define NO_GETS64 ((bfd_int64_t (*) (const void *)) swap_abort)
 170
 171 const bfd_target ptrace_core_vec =
 172   {
 173     "trad-core",
 174     bfd_target_unknown_flavour,
 175     BFD_ENDIAN_UNKNOWN,         /* target byte order */
 176     BFD_ENDIAN_UNKNOWN,         /* target headers byte order */
 177     (HAS_RELOC | EXEC_P |       /* object flags */
 178      HAS_LINENO | HAS_DEBUG |
 179      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 180     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 181     0,                                                     /* symbol prefix */
 182     ' ',                                                   /* ar_pad_char */
 183     16,                                                    /* ar_max_namelen */
 184     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit data */
 185     NO_GET, NO_GETS, NO_PUT,            /* 32 bit data */
 186     NO_GET, NO_GETS, NO_PUT,            /* 16 bit data */
 187     NO_GET64, NO_GETS64, NO_PUT64,      /* 64 bit hdrs */
 188     NO_GET, NO_GETS, NO_PUT,            /* 32 bit hdrs */
 189     NO_GET, NO_GETS, NO_PUT,            /* 16 bit hdrs */
 190
 191     {                           /* bfd_check_format */
 192       _bfd_dummy_target,                /* unknown format */
 193       _bfd_dummy_target,                /* object file */
 194       _bfd_dummy_target,                /* archive */
 195       ptrace_unix_core_file_p           /* a core file */
 196     },
 197     {                           /* bfd_set_format */
 198       bfd_false, bfd_false,
 199       bfd_false, bfd_false
 200     },
 201     {                           /* bfd_write_contents */
 202       bfd_false, bfd_false,
 203       bfd_false, bfd_false
 204     },
 205
 206     BFD_JUMP_TABLE_GENERIC (_bfd_generic),
 207     BFD_JUMP_TABLE_COPY (_bfd_generic),
 208     BFD_JUMP_TABLE_CORE (ptrace_unix),
 209     BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 210     BFD_JUMP_TABLE_SYMBOLS (_bfd_nosymbols),
 211     BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 212     BFD_JUMP_TABLE_WRITE (_bfd_generic),
 213     BFD_JUMP_TABLE_LINK (_bfd_nolink),
 214     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 215
 216     NULL,
 217
 218     (PTR) 0                     /* backend_data */
 219   };
 220
 221 #endif /* PTRACE_CORE */