gnu/dist/gdb6/bfd/i386os9k.c

   1 /* BFD back-end for os9000 i386 binaries.
   2    Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2001, 2002,
   3    2004, 2005 Free Software Foundation, Inc.
   4    Written by Cygnus Support.
   5
   6 This file is part of BFD, the Binary File Descriptor library.
   7
   8 This program is free software; you can redistribute it and/or modify
   9 it under the terms of the GNU General Public License as published by
  10 the Free Software Foundation; either version 2 of the License, or
  11 (at your option) any later version.
  12
  13 This program is distributed in the hope that it will be useful,
  14 but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this program; if not, write to the Free Software
  20 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  21
  22
  23 #include "bfd.h"
  24 #include "sysdep.h"
  25 #include "libbfd.h"
  26 #include "bfdlink.h"
  27 #include "libaout.h"            /* BFD a.out internal data structures */
  28 #include "os9k.h"
  29
  30 static const bfd_target * os9k_callback
  31   PARAMS ((bfd *));
  32 static const bfd_target * os9k_object_p
  33   PARAMS ((bfd *));
  34 static int os9k_sizeof_headers
  35   PARAMS ((bfd *, bfd_boolean));
  36 bfd_boolean os9k_swap_exec_header_in
  37   PARAMS ((bfd *, mh_com *, struct internal_exec *));
  38
  39 /* Swaps the information in an executable header taken from a raw byte
  40    stream memory image, into the internal exec_header structure.  */
  41 bfd_boolean
  42 os9k_swap_exec_header_in (abfd, raw_bytes, execp)
  43      bfd *abfd;
  44      mh_com *raw_bytes;
  45      struct internal_exec *execp;
  46 {
  47   mh_com *bytes = (mh_com *) raw_bytes;
  48   unsigned int dload, dmemsize, dmemstart;
  49
  50   /* Now fill in fields in the execp, from the bytes in the raw data.  */
  51   execp->a_info = H_GET_16 (abfd, bytes->m_sync);
  52   execp->a_syms = 0;
  53   execp->a_entry = H_GET_32 (abfd, bytes->m_exec);
  54   execp->a_talign = 2;
  55   execp->a_dalign = 2;
  56   execp->a_balign = 2;
  57
  58   dload = H_GET_32 (abfd, bytes->m_idata);
  59   execp->a_data = dload + 8;
  60
  61   if (bfd_seek (abfd, (file_ptr) dload, SEEK_SET) != 0
  62       || (bfd_bread (&dmemstart, (bfd_size_type) sizeof (dmemstart), abfd)
  63           != sizeof (dmemstart))
  64       || (bfd_bread (&dmemsize, (bfd_size_type) sizeof (dmemsize), abfd)
  65           != sizeof (dmemsize)))
  66     return FALSE;
  67
  68   execp->a_tload = 0;
  69   execp->a_dload = H_GET_32 (abfd, (unsigned char *) &dmemstart);
  70   execp->a_text = dload - execp->a_tload;
  71   execp->a_data = H_GET_32 (abfd, (unsigned char *) &dmemsize);
  72   execp->a_bss = H_GET_32 (abfd, bytes->m_data) - execp->a_data;
  73
  74   execp->a_trsize = 0;
  75   execp->a_drsize = 0;
  76
  77   return TRUE;
  78 }
  79
  80 static const bfd_target *
  81 os9k_object_p (abfd)
  82      bfd *abfd;
  83 {
  84   struct internal_exec anexec;
  85   mh_com exec_bytes;
  86
  87   if (bfd_bread ((PTR) &exec_bytes, (bfd_size_type) MHCOM_BYTES_SIZE, abfd)
  88       != MHCOM_BYTES_SIZE)
  89     {
  90       if (bfd_get_error () != bfd_error_system_call)
  91         bfd_set_error (bfd_error_wrong_format);
  92       return 0;
  93     }
  94
  95   anexec.a_info = H_GET_16 (abfd, exec_bytes.m_sync);
  96   if (N_BADMAG (anexec))
  97     {
  98       bfd_set_error (bfd_error_wrong_format);
  99       return 0;
 100     }
 101
 102   if (! os9k_swap_exec_header_in (abfd, &exec_bytes, &anexec))
 103     {
 104       if (bfd_get_error () != bfd_error_system_call)
 105         bfd_set_error (bfd_error_wrong_format);
 106       return NULL;
 107     }
 108   return aout_32_some_aout_object_p (abfd, &anexec, os9k_callback);
 109 }
 110
 111
 112 /* Finish up the opening of a b.out file for reading.  Fill in all the
 113    fields that are not handled by common code.  */
 114
 115 static const bfd_target *
 116 os9k_callback (abfd)
 117      bfd *abfd;
 118 {
 119   struct internal_exec *execp = exec_hdr (abfd);
 120   unsigned long bss_start;
 121
 122   /* Architecture and machine type.  */
 123   bfd_set_arch_mach (abfd, bfd_arch_i386, 0);
 124
 125   /* The positions of the string table and symbol table.  */
 126   obj_str_filepos (abfd) = 0;
 127   obj_sym_filepos (abfd) = 0;
 128
 129   /* The alignments of the sections.  */
 130   obj_textsec (abfd)->alignment_power = execp->a_talign;
 131   obj_datasec (abfd)->alignment_power = execp->a_dalign;
 132   obj_bsssec (abfd)->alignment_power = execp->a_balign;
 133
 134   /* The starting addresses of the sections.  */
 135   obj_textsec (abfd)->vma = execp->a_tload;
 136   obj_datasec (abfd)->vma = execp->a_dload;
 137
 138   /* And reload the sizes, since the aout module zaps them.  */
 139   obj_textsec (abfd)->size = execp->a_text;
 140
 141   bss_start = execp->a_dload + execp->a_data;   /* BSS = end of data section.  */
 142   obj_bsssec (abfd)->vma = align_power (bss_start, execp->a_balign);
 143
 144   /* The file positions of the sections.  */
 145   obj_textsec (abfd)->filepos = execp->a_entry;
 146   obj_datasec (abfd)->filepos = execp->a_dload;
 147
 148   /* The file positions of the relocation info ***
 149   obj_textsec (abfd)->rel_filepos = N_TROFF(*execp);
 150   obj_datasec (abfd)->rel_filepos =  N_DROFF(*execp);  */
 151
 152   adata (abfd).page_size = 1;   /* Not applicable.  */
 153   adata (abfd).segment_size = 1;/* Not applicable.  */
 154   adata (abfd).exec_bytes_size = MHCOM_BYTES_SIZE;
 155
 156   return abfd->xvec;
 157 }
 158
 159 static int
 160 os9k_sizeof_headers (ignore_abfd, ignore)
 161      bfd *ignore_abfd ATTRIBUTE_UNUSED;
 162      bfd_boolean ignore ATTRIBUTE_UNUSED;
 163 {
 164   return sizeof (struct internal_exec);
 165 }
 166
 167 \f
 168
 169 #define aout_32_close_and_cleanup aout_32_bfd_free_cached_info
 170
 171 #define aout_32_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
 172
 173 #define aout_32_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
 174
 175 #define aout_32_get_section_contents_in_window \
 176   _bfd_generic_get_section_contents_in_window
 177
 178 #define os9k_bfd_get_relocated_section_contents \
 179   bfd_generic_get_relocated_section_contents
 180 #define os9k_bfd_relax_section bfd_generic_relax_section
 181 #define os9k_bfd_gc_sections bfd_generic_gc_sections
 182 #define os9k_bfd_merge_sections bfd_generic_merge_sections
 183 #define os9k_bfd_is_group_section bfd_generic_is_group_section
 184 #define os9k_bfd_discard_group bfd_generic_discard_group
 185 #define os9k_section_already_linked \
 186   _bfd_generic_section_already_linked
 187 #define os9k_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
 188 #define os9k_bfd_link_hash_table_free _bfd_generic_link_hash_table_free
 189 #define os9k_bfd_link_add_symbols _bfd_generic_link_add_symbols
 190 #define os9k_bfd_link_just_syms _bfd_generic_link_just_syms
 191 #define os9k_bfd_final_link _bfd_generic_final_link
 192 #define os9k_bfd_link_split_section  _bfd_generic_link_split_section
 193
 194 const bfd_target i386os9k_vec =
 195   {
 196     "i386os9k",                 /* name */
 197     bfd_target_os9k_flavour,
 198     BFD_ENDIAN_LITTLE,          /* data byte order is little */
 199     BFD_ENDIAN_LITTLE,          /* hdr byte order is little */
 200     (HAS_RELOC | EXEC_P | WP_TEXT),     /* object flags */
 201     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD),  /* section flags */
 202     0,                          /* symbol leading char */
 203     ' ',                                /* ar_pad_char */
 204     16,                         /* ar_max_namelen */
 205
 206     bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 207     bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 208     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
 209     bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 210     bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 211     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
 212     {_bfd_dummy_target, os9k_object_p,  /* bfd_check_format */
 213      bfd_generic_archive_p, _bfd_dummy_target},
 214     {bfd_false, bfd_false,      /* bfd_set_format */
 215      _bfd_generic_mkarchive, bfd_false},
 216     {bfd_false, bfd_false,      /* bfd_write_contents */
 217      _bfd_write_archive_contents, bfd_false},
 218
 219     BFD_JUMP_TABLE_GENERIC (aout_32),
 220     BFD_JUMP_TABLE_COPY (_bfd_generic),
 221     BFD_JUMP_TABLE_CORE (_bfd_nocore),
 222     BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_bsd),
 223     BFD_JUMP_TABLE_SYMBOLS (aout_32),
 224     BFD_JUMP_TABLE_RELOCS (aout_32),
 225     BFD_JUMP_TABLE_WRITE (aout_32),
 226     BFD_JUMP_TABLE_LINK (os9k),
 227     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 228
 229     NULL,
 230
 231     (PTR) 0,
 232   };