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 /* No archive file support via this BFD */
 193 #define ptrace_unix_openr_next_archived_file    bfd_generic_openr_next_archived_file
 194 #define ptrace_unix_generic_stat_arch_elt               bfd_generic_stat_arch_elt
 195 #define ptrace_unix_slurp_armap                 bfd_false
 196 #define ptrace_unix_slurp_extended_name_table   bfd_true
 197 #define ptrace_unix_write_armap                 (boolean (*) PARAMS     \
 198     ((bfd *arch, unsigned int elength, struct orl *map, \
 199       unsigned int orl_count, int stridx))) bfd_false
 200 #define ptrace_unix_truncate_arname             bfd_dont_truncate_arname
 201 #define aout_32_openr_next_archived_file        bfd_generic_openr_next_archived_file
 202
 203 #define ptrace_unix_close_and_cleanup           bfd_generic_close_and_cleanup
 204 #define ptrace_unix_set_section_contents                (boolean (*) PARAMS     \
 205         ((bfd *abfd, asection *section, PTR data, file_ptr offset,      \
 206         bfd_size_type count))) bfd_generic_set_section_contents
 207 #define ptrace_unix_get_section_contents                bfd_generic_get_section_contents
 208 #define ptrace_unix_new_section_hook            (boolean (*) PARAMS     \
 209         ((bfd *, sec_ptr))) bfd_true
 210 #define ptrace_unix_get_symtab_upper_bound      bfd_0l
 211 #define ptrace_unix_get_symtab                  (long (*) PARAMS \
 212         ((bfd *, struct symbol_cache_entry **))) bfd_0l
 213 #define ptrace_unix_get_reloc_upper_bound       (long (*) PARAMS \
 214         ((bfd *, sec_ptr))) bfd_0l
 215 #define ptrace_unix_canonicalize_reloc          (long (*) PARAMS \
 216         ((bfd *, sec_ptr, arelent **, struct symbol_cache_entry**))) bfd_0l
 217 #define ptrace_unix_make_empty_symbol           (struct symbol_cache_entry * \
 218         (*) PARAMS ((bfd *))) bfd_false
 219 #define ptrace_unix_print_symbol                        (void (*) PARAMS        \
 220         ((bfd *, PTR, struct symbol_cache_entry  *,                     \
 221         bfd_print_symbol_type))) bfd_false
 222 #define ptrace_unix_get_symbol_info             (void (*) PARAMS        \
 223         ((bfd *, struct symbol_cache_entry  *,                  \
 224         symbol_info *))) bfd_false
 225 #define ptrace_unix_get_lineno                  (alent * (*) PARAMS     \
 226         ((bfd *, struct symbol_cache_entry *))) bfd_nullvoidptr
 227 #define ptrace_unix_set_arch_mach                       (boolean (*) PARAMS     \
 228         ((bfd *, enum bfd_architecture, unsigned long))) bfd_false
 229 #define ptrace_unix_find_nearest_line           (boolean (*) PARAMS     \
 230         ((bfd *abfd, struct sec  *section,                              \
 231          struct symbol_cache_entry  **symbols,bfd_vma offset,           \
 232          CONST char **file, CONST char **func, unsigned int *line))) bfd_false
 233 #define ptrace_unix_sizeof_headers              (int (*) PARAMS \
 234         ((bfd *, boolean))) bfd_0
 235
 236 #define ptrace_unix_bfd_debug_info_start                bfd_void
 237 #define ptrace_unix_bfd_debug_info_end          bfd_void
 238 #define ptrace_unix_bfd_debug_info_accumulate   (void (*) PARAMS        \
 239         ((bfd *, struct sec *))) bfd_void
 240 #define ptrace_unix_bfd_get_relocated_section_contents bfd_generic_get_relocated_section_contents
 241 #define ptrace_unix_bfd_relax_section           bfd_generic_relax_section
 242 #define ptrace_unix_bfd_reloc_type_lookup \
 243   ((CONST struct reloc_howto_struct *(*) PARAMS ((bfd *, bfd_reloc_code_real_type))) bfd_nullvoidptr)
 244 #define ptrace_unix_bfd_make_debug_symbol \
 245   ((asymbol *(*) PARAMS ((bfd *, void *, unsigned long))) bfd_nullvoidptr)
 246 #define ptrace_unix_bfd_link_hash_table_create \
 247   ((struct bfd_link_hash_table *(*) PARAMS ((bfd *))) bfd_nullvoidptr)
 248 #define ptrace_unix_bfd_link_add_symbols \
 249   ((boolean (*) PARAMS ((bfd *, struct bfd_link_info *))) bfd_false)
 250 #define ptrace_unix_bfd_final_link \
 251   ((boolean (*) PARAMS ((bfd *, struct bfd_link_info *))) bfd_false)
 252 #define ptrace_unix_bfd_copy_private_section_data \
 253   ((boolean (*) PARAMS ((bfd *, asection *, bfd *, asection *))) bfd_false)
 254 #define ptrace_unix_bfd_copy_private_bfd_data \
 255   ((boolean (*) PARAMS ((bfd *, bfd *))) bfd_false)
 256 #define ptrace_unix_bfd_is_local_label \
 257   ((boolean (*) PARAMS ((bfd *, bfd *))) bfd_false)
 258 #define ptrace_unix_bfd_free_cached_info bfd_true
 259
 260 /* If somebody calls any byte-swapping routines, shoot them.  */
 261 void
 262 swap_abort()
 263 {
 264   abort(); /* This way doesn't require any declaration for ANSI to fuck up */
 265 }
 266 #define NO_GET  ((bfd_vma (*) PARAMS ((   const bfd_byte *))) swap_abort )
 267 #define NO_PUT  ((void    (*) PARAMS ((bfd_vma, bfd_byte *))) swap_abort )
 268 #define NO_SIGNED_GET \
 269   ((bfd_signed_vma (*) PARAMS ((const bfd_byte *))) swap_abort )
 270
 271 bfd_target ptrace_core_vec =
 272   {
 273     "trad-core",
 274     bfd_target_unknown_flavour,
 275     true,                       /* target byte order */
 276     true,                       /* target headers byte order */
 277     (HAS_RELOC | EXEC_P |       /* object flags */
 278      HAS_LINENO | HAS_DEBUG |
 279      HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
 280     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* section flags */
 281     0,                                                     /* symbol prefix */
 282     ' ',                                                   /* ar_pad_char */
 283     16,                                                    /* ar_max_namelen */
 284     3,                                                     /* minimum alignment power */
 285     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit data */
 286     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit data */
 287     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit data */
 288     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 64 bit hdrs */
 289     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 32 bit hdrs */
 290     NO_GET, NO_SIGNED_GET, NO_PUT,      /* 16 bit hdrs */
 291
 292     {                           /* bfd_check_format */
 293      _bfd_dummy_target,         /* unknown format */
 294      _bfd_dummy_target,         /* object file */
 295      _bfd_dummy_target,         /* archive */
 296      ptrace_unix_core_file_p    /* a core file */
 297     },
 298     {                           /* bfd_set_format */
 299      bfd_false, bfd_false,
 300      bfd_false, bfd_false
 301     },
 302     {                           /* bfd_write_contents */
 303      bfd_false, bfd_false,
 304      bfd_false, bfd_false
 305     },
 306
 307     JUMP_TABLE(ptrace_unix),
 308     (PTR) 0                     /* backend_data */
 309 };
 310
 311 #endif /* PTRACE_CORE */