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, 2006 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 /* Swaps the information in an executable header taken from a raw byte
  31    stream memory image, into the internal exec_header structure.  */
  32 static bfd_boolean
  33 os9k_swap_exec_header_in (bfd *abfd,
  34                           mh_com *raw_bytes,
  35                           struct internal_exec *execp)
  36 {
  37   mh_com *bytes = (mh_com *) raw_bytes;
  38   unsigned int dload, dmemsize, dmemstart;
  39
  40   /* Now fill in fields in the execp, from the bytes in the raw data.  */
  41   execp->a_info = H_GET_16 (abfd, bytes->m_sync);
  42   execp->a_syms = 0;
  43   execp->a_entry = H_GET_32 (abfd, bytes->m_exec);
  44   execp->a_talign = 2;
  45   execp->a_dalign = 2;
  46   execp->a_balign = 2;
  47
  48   dload = H_GET_32 (abfd, bytes->m_idata);
  49   execp->a_data = dload + 8;
  50
  51   if (bfd_seek (abfd, (file_ptr) dload, SEEK_SET) != 0
  52       || (bfd_bread (&dmemstart, (bfd_size_type) sizeof (dmemstart), abfd)
  53           != sizeof (dmemstart))
  54       || (bfd_bread (&dmemsize, (bfd_size_type) sizeof (dmemsize), abfd)
  55           != sizeof (dmemsize)))
  56     return FALSE;
  57
  58   execp->a_tload = 0;
  59   execp->a_dload = H_GET_32 (abfd, (unsigned char *) &dmemstart);
  60   execp->a_text = dload - execp->a_tload;
  61   execp->a_data = H_GET_32 (abfd, (unsigned char *) &dmemsize);
  62   execp->a_bss = H_GET_32 (abfd, bytes->m_data) - execp->a_data;
  63
  64   execp->a_trsize = 0;
  65   execp->a_drsize = 0;
  66
  67   return TRUE;
  68 }
  69
  70
  71 /* Finish up the opening of a b.out file for reading.  Fill in all the
  72    fields that are not handled by common code.  */
  73
  74 static const bfd_target *
  75 os9k_callback (bfd *abfd)
  76 {
  77   struct internal_exec *execp = exec_hdr (abfd);
  78   unsigned long bss_start;
  79
  80   /* Architecture and machine type.  */
  81   bfd_set_arch_mach (abfd, bfd_arch_i386, 0);
  82
  83   /* The positions of the string table and symbol table.  */
  84   obj_str_filepos (abfd) = 0;
  85   obj_sym_filepos (abfd) = 0;
  86
  87   /* The alignments of the sections.  */
  88   obj_textsec (abfd)->alignment_power = execp->a_talign;
  89   obj_datasec (abfd)->alignment_power = execp->a_dalign;
  90   obj_bsssec (abfd)->alignment_power = execp->a_balign;
  91
  92   /* The starting addresses of the sections.  */
  93   obj_textsec (abfd)->vma = execp->a_tload;
  94   obj_datasec (abfd)->vma = execp->a_dload;
  95
  96   /* And reload the sizes, since the aout module zaps them.  */
  97   obj_textsec (abfd)->size = execp->a_text;
  98
  99   bss_start = execp->a_dload + execp->a_data;   /* BSS = end of data section.  */
 100   obj_bsssec (abfd)->vma = align_power (bss_start, execp->a_balign);
 101
 102   /* The file positions of the sections.  */
 103   obj_textsec (abfd)->filepos = execp->a_entry;
 104   obj_datasec (abfd)->filepos = execp->a_dload;
 105
 106   /* The file positions of the relocation info ***
 107   obj_textsec (abfd)->rel_filepos = N_TROFF(*execp);
 108   obj_datasec (abfd)->rel_filepos =  N_DROFF(*execp);  */
 109
 110   adata (abfd).page_size = 1;   /* Not applicable.  */
 111   adata (abfd).segment_size = 1;/* Not applicable.  */
 112   adata (abfd).exec_bytes_size = MHCOM_BYTES_SIZE;
 113
 114   return abfd->xvec;
 115 }
 116
 117 static const bfd_target *
 118 os9k_object_p (bfd *abfd)
 119 {
 120   struct internal_exec anexec;
 121   mh_com exec_bytes;
 122
 123   if (bfd_bread ((PTR) &exec_bytes, (bfd_size_type) MHCOM_BYTES_SIZE, abfd)
 124       != MHCOM_BYTES_SIZE)
 125     {
 126       if (bfd_get_error () != bfd_error_system_call)
 127         bfd_set_error (bfd_error_wrong_format);
 128       return 0;
 129     }
 130
 131   anexec.a_info = H_GET_16 (abfd, exec_bytes.m_sync);
 132   if (N_BADMAG (anexec))
 133     {
 134       bfd_set_error (bfd_error_wrong_format);
 135       return 0;
 136     }
 137
 138   if (! os9k_swap_exec_header_in (abfd, &exec_bytes, &anexec))
 139     {
 140       if (bfd_get_error () != bfd_error_system_call)
 141         bfd_set_error (bfd_error_wrong_format);
 142       return NULL;
 143     }
 144   return aout_32_some_aout_object_p (abfd, &anexec, os9k_callback);
 145 }
 146
 147 static int
 148 os9k_sizeof_headers (bfd *abfd ATTRIBUTE_UNUSED,
 149                      struct bfd_link_info *info ATTRIBUTE_UNUSED)
 150 {
 151   return sizeof (struct internal_exec);
 152 }
 153
 154 \f
 155
 156 #define aout_32_close_and_cleanup aout_32_bfd_free_cached_info
 157
 158 #define aout_32_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
 159
 160 #define aout_32_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
 161
 162 #define aout_32_get_section_contents_in_window \
 163   _bfd_generic_get_section_contents_in_window
 164
 165 #define os9k_bfd_get_relocated_section_contents \
 166   bfd_generic_get_relocated_section_contents
 167 #define os9k_bfd_relax_section bfd_generic_relax_section
 168 #define os9k_bfd_gc_sections bfd_generic_gc_sections
 169 #define os9k_bfd_merge_sections bfd_generic_merge_sections
 170 #define os9k_bfd_is_group_section bfd_generic_is_group_section
 171 #define os9k_bfd_discard_group bfd_generic_discard_group
 172 #define os9k_section_already_linked \
 173   _bfd_generic_section_already_linked
 174 #define os9k_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
 175 #define os9k_bfd_link_hash_table_free _bfd_generic_link_hash_table_free
 176 #define os9k_bfd_link_add_symbols _bfd_generic_link_add_symbols
 177 #define os9k_bfd_link_just_syms _bfd_generic_link_just_syms
 178 #define os9k_bfd_final_link _bfd_generic_final_link
 179 #define os9k_bfd_link_split_section  _bfd_generic_link_split_section
 180
 181 const bfd_target i386os9k_vec =
 182   {
 183     "i386os9k",                 /* name */
 184     bfd_target_os9k_flavour,
 185     BFD_ENDIAN_LITTLE,          /* data byte order is little */
 186     BFD_ENDIAN_LITTLE,          /* hdr byte order is little */
 187     (HAS_RELOC | EXEC_P | WP_TEXT),     /* object flags */
 188     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD),  /* section flags */
 189     0,                          /* symbol leading char */
 190     ' ',                                /* ar_pad_char */
 191     16,                         /* ar_max_namelen */
 192
 193     bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 194     bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 195     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
 196     bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 197     bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 198     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
 199     {_bfd_dummy_target, os9k_object_p,  /* bfd_check_format */
 200      bfd_generic_archive_p, _bfd_dummy_target},
 201     {bfd_false, bfd_false,      /* bfd_set_format */
 202      _bfd_generic_mkarchive, bfd_false},
 203     {bfd_false, bfd_false,      /* bfd_write_contents */
 204      _bfd_write_archive_contents, bfd_false},
 205
 206     BFD_JUMP_TABLE_GENERIC (aout_32),
 207     BFD_JUMP_TABLE_COPY (_bfd_generic),
 208     BFD_JUMP_TABLE_CORE (_bfd_nocore),
 209     BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_bsd),
 210     BFD_JUMP_TABLE_SYMBOLS (aout_32),
 211     BFD_JUMP_TABLE_RELOCS (aout_32),
 212     BFD_JUMP_TABLE_WRITE (aout_32),
 213     BFD_JUMP_TABLE_LINK (os9k),
 214     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 215
 216     NULL,
 217
 218     (PTR) 0,
 219   };