bfd/i386os9k.c

   1 /* BFD back-end for os9000 i386 binaries.
   2    Copyright (C) 1990-2018 Free Software Foundation, Inc.
   3    Written by Cygnus Support.
   4
   5    This file is part of BFD, the Binary File Descriptor library.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
  20    MA 02110-1301, USA.  */
  21
  22 #include "sysdep.h"
  23 #include "bfd.h"
  24 #include "libbfd.h"
  25 #include "bfdlink.h"
  26 #include "libaout.h"            /* BFD a.out internal data structures */
  27 #include "os9k.h"
  28
  29 /* Swaps the information in an executable header taken from a raw byte
  30    stream memory image, into the internal exec_header structure.  */
  31 static bfd_boolean
  32 os9k_swap_exec_header_in (bfd *abfd,
  33                           mh_com *raw_bytes,
  34                           struct internal_exec *execp)
  35 {
  36   mh_com *bytes = (mh_com *) raw_bytes;
  37   unsigned int dload, dmemsize, dmemstart;
  38
  39   /* Now fill in fields in the execp, from the bytes in the raw data.  */
  40   execp->a_info = H_GET_16 (abfd, bytes->m_sync);
  41   execp->a_syms = 0;
  42   execp->a_entry = H_GET_32 (abfd, bytes->m_exec);
  43   execp->a_talign = 2;
  44   execp->a_dalign = 2;
  45   execp->a_balign = 2;
  46
  47   dload = H_GET_32 (abfd, bytes->m_idata);
  48   execp->a_data = dload + 8;
  49
  50   if (bfd_seek (abfd, (file_ptr) dload, SEEK_SET) != 0
  51       || (bfd_bread (&dmemstart, (bfd_size_type) sizeof (dmemstart), abfd)
  52           != sizeof (dmemstart))
  53       || (bfd_bread (&dmemsize, (bfd_size_type) sizeof (dmemsize), abfd)
  54           != sizeof (dmemsize)))
  55     return FALSE;
  56
  57   execp->a_tload = 0;
  58   execp->a_dload = H_GET_32 (abfd, (unsigned char *) &dmemstart);
  59   execp->a_text = dload - execp->a_tload;
  60   execp->a_data = H_GET_32 (abfd, (unsigned char *) &dmemsize);
  61   execp->a_bss = H_GET_32 (abfd, bytes->m_data) - execp->a_data;
  62
  63   execp->a_trsize = 0;
  64   execp->a_drsize = 0;
  65
  66   return TRUE;
  67 }
  68
  69
  70 /* Finish up the opening of a b.out file for reading.  Fill in all the
  71    fields that are not handled by common code.  */
  72
  73 static const bfd_target *
  74 os9k_callback (bfd *abfd)
  75 {
  76   struct internal_exec *execp = exec_hdr (abfd);
  77   unsigned long bss_start;
  78
  79   /* Architecture and machine type.  */
  80   bfd_set_arch_mach (abfd, bfd_arch_i386, 0);
  81
  82   /* The positions of the string table and symbol table.  */
  83   obj_str_filepos (abfd) = 0;
  84   obj_sym_filepos (abfd) = 0;
  85
  86   /* The alignments of the sections.  */
  87   obj_textsec (abfd)->alignment_power = execp->a_talign;
  88   obj_datasec (abfd)->alignment_power = execp->a_dalign;
  89   obj_bsssec (abfd)->alignment_power = execp->a_balign;
  90
  91   /* The starting addresses of the sections.  */
  92   obj_textsec (abfd)->vma = execp->a_tload;
  93   obj_datasec (abfd)->vma = execp->a_dload;
  94
  95   /* And reload the sizes, since the aout module zaps them.  */
  96   obj_textsec (abfd)->size = execp->a_text;
  97
  98   bss_start = execp->a_dload + execp->a_data;   /* BSS = end of data section.  */
  99   obj_bsssec (abfd)->vma = align_power (bss_start, execp->a_balign);
 100
 101   /* The file positions of the sections.  */
 102   obj_textsec (abfd)->filepos = execp->a_entry;
 103   obj_datasec (abfd)->filepos = execp->a_dload;
 104
 105   /* The file positions of the relocation info ***
 106   obj_textsec (abfd)->rel_filepos = N_TROFF (execp);
 107   obj_datasec (abfd)->rel_filepos =  N_DROFF (execp);  */
 108
 109   adata (abfd).page_size = 1;   /* Not applicable.  */
 110   adata (abfd).segment_size = 1;/* Not applicable.  */
 111   adata (abfd).exec_bytes_size = MHCOM_BYTES_SIZE;
 112
 113   return abfd->xvec;
 114 }
 115
 116 static const bfd_target *
 117 os9k_object_p (bfd *abfd)
 118 {
 119   struct internal_exec anexec;
 120   mh_com exec_bytes;
 121
 122   if (bfd_bread (&exec_bytes, (bfd_size_type) MHCOM_BYTES_SIZE, abfd)
 123       != MHCOM_BYTES_SIZE)
 124     {
 125       if (bfd_get_error () != bfd_error_system_call)
 126         bfd_set_error (bfd_error_wrong_format);
 127       return 0;
 128     }
 129
 130   anexec.a_info = H_GET_16 (abfd, exec_bytes.m_sync);
 131   if (N_BADMAG (&anexec))
 132     {
 133       bfd_set_error (bfd_error_wrong_format);
 134       return 0;
 135     }
 136
 137   if (! os9k_swap_exec_header_in (abfd, &exec_bytes, &anexec))
 138     {
 139       if (bfd_get_error () != bfd_error_system_call)
 140         bfd_set_error (bfd_error_wrong_format);
 141       return NULL;
 142     }
 143   return aout_32_some_aout_object_p (abfd, &anexec, os9k_callback);
 144 }
 145
 146 static int
 147 os9k_sizeof_headers (bfd *abfd ATTRIBUTE_UNUSED,
 148                      struct bfd_link_info *info ATTRIBUTE_UNUSED)
 149 {
 150   return sizeof (struct internal_exec);
 151 }
 152
 153 \f
 154
 155 #define aout_32_close_and_cleanup aout_32_bfd_free_cached_info
 156
 157 #define aout_32_find_line             _bfd_nosymbols_find_line
 158 #define aout_32_get_symbol_version_string \
 159   _bfd_nosymbols_get_symbol_version_string
 160 #define aout_32_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
 161
 162 #define aout_32_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
 163 #define aout_32_bfd_reloc_name_lookup _bfd_norelocs_bfd_reloc_name_lookup
 164
 165 #define aout_32_get_section_contents_in_window \
 166   _bfd_generic_get_section_contents_in_window
 167
 168 #define aout_32_set_reloc _bfd_generic_set_reloc
 169
 170 #define os9k_bfd_get_relocated_section_contents \
 171   bfd_generic_get_relocated_section_contents
 172 #define os9k_bfd_relax_section bfd_generic_relax_section
 173 #define os9k_bfd_gc_sections bfd_generic_gc_sections
 174 #define os9k_bfd_lookup_section_flags bfd_generic_lookup_section_flags
 175 #define os9k_bfd_merge_sections bfd_generic_merge_sections
 176 #define os9k_bfd_is_group_section bfd_generic_is_group_section
 177 #define os9k_bfd_discard_group bfd_generic_discard_group
 178 #define os9k_section_already_linked \
 179   _bfd_generic_section_already_linked
 180 #define os9k_bfd_define_common_symbol bfd_generic_define_common_symbol
 181 #define os9k_bfd_define_start_stop bfd_generic_define_start_stop
 182 #define os9k_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
 183 #define os9k_bfd_link_add_symbols _bfd_generic_link_add_symbols
 184 #define os9k_bfd_link_just_syms _bfd_generic_link_just_syms
 185 #define os9k_bfd_copy_link_hash_symbol_type \
 186   _bfd_generic_copy_link_hash_symbol_type
 187 #define os9k_bfd_final_link _bfd_generic_final_link
 188 #define os9k_bfd_link_split_section  _bfd_generic_link_split_section
 189 #define os9k_bfd_link_check_relocs   _bfd_generic_link_check_relocs
 190
 191 const bfd_target i386_aout_os9k_vec =
 192   {
 193     "i386os9k",                 /* name */
 194     bfd_target_os9k_flavour,
 195     BFD_ENDIAN_LITTLE,          /* data byte order is little */
 196     BFD_ENDIAN_LITTLE,          /* hdr byte order is little */
 197     (HAS_RELOC | EXEC_P | WP_TEXT),     /* object flags */
 198     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD),  /* section flags */
 199     0,                          /* symbol leading char */
 200     ' ',                                /* ar_pad_char */
 201     16,                         /* ar_max_namelen */
 202     0,                          /* match priority.  */
 203
 204     bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 205     bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 206     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
 207     bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 208     bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 209     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
 210     {                           /* bfd_check_format */
 211       _bfd_dummy_target,
 212       os9k_object_p,
 213       bfd_generic_archive_p,
 214       _bfd_dummy_target
 215     },
 216     {                           /* bfd_set_format */
 217       _bfd_bool_bfd_false_error,
 218       _bfd_bool_bfd_false_error,
 219       _bfd_generic_mkarchive,
 220       _bfd_bool_bfd_false_error
 221     },
 222     {                           /* bfd_write_contents */
 223       _bfd_bool_bfd_false_error,
 224       _bfd_bool_bfd_false_error,
 225       _bfd_write_archive_contents,
 226       _bfd_bool_bfd_false_error
 227     },
 228
 229     BFD_JUMP_TABLE_GENERIC (aout_32),
 230     BFD_JUMP_TABLE_COPY (_bfd_generic),
 231     BFD_JUMP_TABLE_CORE (_bfd_nocore),
 232     BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_bsd),
 233     BFD_JUMP_TABLE_SYMBOLS (aout_32),
 234     BFD_JUMP_TABLE_RELOCS (aout_32),
 235     BFD_JUMP_TABLE_WRITE (aout_32),
 236     BFD_JUMP_TABLE_LINK (os9k),
 237     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 238
 239     NULL,
 240
 241     NULL,
 242   };