bfd/i386os9k.c

   1 /* BFD back-end for os9000 i386 binaries.
   2    Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1998, 1999, 2001, 2002
   3    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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 PARAMS ((bfd *));
  31 static const bfd_target * os9k_object_p PARAMS ((bfd *));
  32 static int                os9k_sizeof_headers PARAMS ((bfd *, boolean));
  33 boolean                   os9k_swap_exec_header_in PARAMS ((bfd *, mh_com *, struct internal_exec *));
  34
  35 /* Swaps the information in an executable header taken from a raw byte
  36    stream memory image, into the internal exec_header structure.  */
  37 boolean
  38 os9k_swap_exec_header_in (abfd, raw_bytes, execp)
  39      bfd *abfd;
  40      mh_com *raw_bytes;
  41      struct internal_exec *execp;
  42 {
  43   mh_com *bytes = (mh_com *) raw_bytes;
  44   unsigned int dload, dmemsize, dmemstart;
  45
  46   /* Now fill in fields in the execp, from the bytes in the raw data.  */
  47   execp->a_info = H_GET_16 (abfd, bytes->m_sync);
  48   execp->a_syms = 0;
  49   execp->a_entry = H_GET_32 (abfd, bytes->m_exec);
  50   execp->a_talign = 2;
  51   execp->a_dalign = 2;
  52   execp->a_balign = 2;
  53
  54   dload = H_GET_32 (abfd, bytes->m_idata);
  55   execp->a_data = dload + 8;
  56
  57   if (bfd_seek (abfd, (file_ptr) dload, SEEK_SET) != 0
  58       || (bfd_bread (&dmemstart, (bfd_size_type) sizeof (dmemstart), abfd)
  59           != sizeof (dmemstart))
  60       || (bfd_bread (&dmemsize, (bfd_size_type) sizeof (dmemsize), abfd)
  61           != sizeof (dmemsize)))
  62     return false;
  63
  64   execp->a_tload = 0;
  65   execp->a_dload = H_GET_32 (abfd, (unsigned char *) &dmemstart);
  66   execp->a_text = dload - execp->a_tload;
  67   execp->a_data = H_GET_32 (abfd, (unsigned char *) &dmemsize);
  68   execp->a_bss = H_GET_32 (abfd, bytes->m_data) - execp->a_data;
  69
  70   execp->a_trsize = 0;
  71   execp->a_drsize = 0;
  72
  73   return true;
  74 }
  75
  76 #if 0
  77 /* Swaps the information in an internal exec header structure into the
  78    supplied buffer ready for writing to disk.  */
  79
  80 void os9k_swap_exec_header_out
  81   PARAMS ((bfd *, struct internal_exec *, struct mh_com *));
  82
  83 void
  84 os9k_swap_exec_header_out (abfd, execp, raw_bytes)
  85      bfd *abfd;
  86      struct internal_exec *execp;
  87      mh_com *raw_bytes;
  88 {
  89   mh_com *bytes = (mh_com *) raw_bytes;
  90
  91   /* Now fill in fields in the raw data, from the fields in the exec struct. */
  92   H_PUT_32 (abfd, execp->a_info, bytes->e_info);
  93   H_PUT_32 (abfd, execp->a_text, bytes->e_text);
  94   H_PUT_32 (abfd, execp->a_data, bytes->e_data);
  95   H_PUT_32 (abfd, execp->a_bss, bytes->e_bss);
  96   H_PUT_32 (abfd, execp->a_syms, bytes->e_syms);
  97   H_PUT_32 (abfd, execp->a_entry, bytes->e_entry);
  98   H_PUT_32 (abfd, execp->a_trsize, bytes->e_trsize);
  99   H_PUT_32 (abfd, execp->a_drsize, bytes->e_drsize);
 100   H_PUT_32 (abfd, execp->a_tload, bytes->e_tload);
 101   H_PUT_32 (abfd, execp->a_dload, bytes->e_dload);
 102   bytes->e_talign[0] = execp->a_talign;
 103   bytes->e_dalign[0] = execp->a_dalign;
 104   bytes->e_balign[0] = execp->a_balign;
 105   bytes->e_relaxable[0] = execp->a_relaxable;
 106 }
 107
 108 #endif  /* 0 */
 109
 110 static const bfd_target *
 111 os9k_object_p (abfd)
 112      bfd *abfd;
 113 {
 114   struct internal_exec anexec;
 115   mh_com exec_bytes;
 116
 117   if (bfd_bread ((PTR) &exec_bytes, (bfd_size_type) MHCOM_BYTES_SIZE, abfd)
 118       != MHCOM_BYTES_SIZE)
 119     {
 120       if (bfd_get_error () != bfd_error_system_call)
 121         bfd_set_error (bfd_error_wrong_format);
 122       return 0;
 123     }
 124
 125   anexec.a_info = H_GET_16 (abfd, exec_bytes.m_sync);
 126   if (N_BADMAG (anexec))
 127     {
 128       bfd_set_error (bfd_error_wrong_format);
 129       return 0;
 130     }
 131
 132   if (! os9k_swap_exec_header_in (abfd, &exec_bytes, &anexec))
 133     {
 134       if (bfd_get_error () != bfd_error_system_call)
 135         bfd_set_error (bfd_error_wrong_format);
 136       return NULL;
 137     }
 138   return aout_32_some_aout_object_p (abfd, &anexec, os9k_callback);
 139 }
 140
 141
 142 /* Finish up the opening of a b.out file for reading.  Fill in all the
 143    fields that are not handled by common code.  */
 144
 145 static const bfd_target *
 146 os9k_callback (abfd)
 147      bfd *abfd;
 148 {
 149   struct internal_exec *execp = exec_hdr (abfd);
 150   unsigned long bss_start;
 151
 152   /* Architecture and machine type.  */
 153   bfd_set_arch_mach (abfd, bfd_arch_i386, 0);
 154
 155   /* The positions of the string table and symbol table.  */
 156   obj_str_filepos (abfd) = 0;
 157   obj_sym_filepos (abfd) = 0;
 158
 159   /* The alignments of the sections.  */
 160   obj_textsec (abfd)->alignment_power = execp->a_talign;
 161   obj_datasec (abfd)->alignment_power = execp->a_dalign;
 162   obj_bsssec (abfd)->alignment_power = execp->a_balign;
 163
 164   /* The starting addresses of the sections.  */
 165   obj_textsec (abfd)->vma = execp->a_tload;
 166   obj_datasec (abfd)->vma = execp->a_dload;
 167
 168   /* And reload the sizes, since the aout module zaps them.  */
 169   obj_textsec (abfd)->_raw_size = execp->a_text;
 170
 171   bss_start = execp->a_dload + execp->a_data;   /* BSS = end of data section.  */
 172   obj_bsssec (abfd)->vma = align_power (bss_start, execp->a_balign);
 173
 174   /* The file positions of the sections.  */
 175   obj_textsec (abfd)->filepos = execp->a_entry;
 176   obj_datasec (abfd)->filepos = execp->a_dload;
 177
 178   /* The file positions of the relocation info ***
 179   obj_textsec (abfd)->rel_filepos = N_TROFF(*execp);
 180   obj_datasec (abfd)->rel_filepos =  N_DROFF(*execp);  */
 181
 182   adata (abfd).page_size = 1;   /* Not applicable.  */
 183   adata (abfd).segment_size = 1;/* Not applicable.  */
 184   adata (abfd).exec_bytes_size = MHCOM_BYTES_SIZE;
 185
 186   return abfd->xvec;
 187 }
 188
 189 #if 0
 190 struct bout_data_struct
 191 {
 192   struct aoutdata a;
 193   struct internal_exec e;
 194 };
 195
 196 static boolean
 197 os9k_mkobject (abfd)
 198      bfd *abfd;
 199 {
 200   struct bout_data_struct *rawptr;
 201   bfd_size_type amt = sizeof (struct bout_data_struct);
 202
 203   rawptr = (struct bout_data_struct *) bfd_zalloc (abfd, amt);
 204   if (rawptr == NULL)
 205     return false;
 206
 207   abfd->tdata.bout_data = rawptr;
 208   exec_hdr (abfd) = &rawptr->e;
 209
 210   obj_textsec (abfd) = (asection *) NULL;
 211   obj_datasec (abfd) = (asection *) NULL;
 212   obj_bsssec (abfd) = (asection *) NULL;
 213
 214   return true;
 215 }
 216
 217 static boolean
 218 os9k_write_object_contents (abfd)
 219      bfd *abfd;
 220 {
 221   struct external_exec swapped_hdr;
 222
 223   if (! aout_32_make_sections (abfd))
 224     return false;
 225
 226   exec_hdr (abfd)->a_info = BMAGIC;
 227
 228   exec_hdr (abfd)->a_text = obj_textsec (abfd)->_raw_size;
 229   exec_hdr (abfd)->a_data = obj_datasec (abfd)->_raw_size;
 230   exec_hdr (abfd)->a_bss = obj_bsssec (abfd)->_raw_size;
 231   exec_hdr (abfd)->a_syms = bfd_get_symcount (abfd) * sizeof (struct nlist);
 232   exec_hdr (abfd)->a_entry = bfd_get_start_address (abfd);
 233   exec_hdr (abfd)->a_trsize = ((obj_textsec (abfd)->reloc_count) *
 234                                sizeof (struct relocation_info));
 235   exec_hdr (abfd)->a_drsize = ((obj_datasec (abfd)->reloc_count) *
 236                                sizeof (struct relocation_info));
 237
 238   exec_hdr (abfd)->a_talign = obj_textsec (abfd)->alignment_power;
 239   exec_hdr (abfd)->a_dalign = obj_datasec (abfd)->alignment_power;
 240   exec_hdr (abfd)->a_balign = obj_bsssec (abfd)->alignment_power;
 241
 242   exec_hdr (abfd)->a_tload = obj_textsec (abfd)->vma;
 243   exec_hdr (abfd)->a_dload = obj_datasec (abfd)->vma;
 244
 245   bout_swap_exec_header_out (abfd, exec_hdr (abfd), &swapped_hdr);
 246
 247   if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
 248       || bfd_bwrite ((PTR) & swapped_hdr, (bfd_size_type) EXEC_BYTES_SIZE,
 249                     abfd) != EXEC_BYTES_SIZE)
 250     return false;
 251
 252   /* Now write out reloc info, followed by syms and strings.  */
 253   if (bfd_get_symcount (abfd) != 0)
 254     {
 255       if (bfd_seek (abfd, (file_ptr) (N_SYMOFF (*exec_hdr (abfd))), SEEK_SET)
 256           != 0)
 257         return false;
 258
 259       if (!aout_32_write_syms (abfd))
 260         return false;
 261
 262       if (bfd_seek (abfd, (file_ptr) (N_TROFF (*exec_hdr (abfd))), SEEK_SET)
 263           != 0)
 264         return false;
 265
 266       if (!b_out_squirt_out_relocs (abfd, obj_textsec (abfd)))
 267         return false;
 268       if (bfd_seek (abfd, (file_ptr) (N_DROFF (*exec_hdr (abfd))), SEEK_SET)
 269           != 0)
 270         return false;
 271
 272       if (!b_out_squirt_out_relocs (abfd, obj_datasec (abfd)))
 273         return false;
 274     }
 275   return true;
 276 }
 277 \f
 278 static boolean
 279 os9k_set_section_contents (abfd, section, location, offset, count)
 280      bfd *abfd;
 281      sec_ptr section;
 282      unsigned char *location;
 283      file_ptr offset;
 284      int count;
 285 {
 286
 287   if (abfd->output_has_begun == false)
 288     {                           /* set by bfd.c handler */
 289       if (! aout_32_make_sections (abfd))
 290         return false;
 291
 292       obj_textsec (abfd)->filepos = sizeof (struct internal_exec);
 293       obj_datasec (abfd)->filepos = obj_textsec (abfd)->filepos
 294         + obj_textsec (abfd)->_raw_size;
 295
 296     }
 297   /* Regardless, once we know what we're doing, we might as well get going.  */
 298   if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0)
 299     return false;
 300
 301   if (count != 0)
 302     return bfd_bwrite ((PTR) location, (bfd_size_type) count, abfd) == count;
 303
 304   return true;
 305 }
 306 #endif  /* 0 */
 307
 308 static int
 309 os9k_sizeof_headers (ignore_abfd, ignore)
 310      bfd *ignore_abfd ATTRIBUTE_UNUSED;
 311      boolean ignore ATTRIBUTE_UNUSED;
 312 {
 313   return sizeof (struct internal_exec);
 314 }
 315
 316 \f
 317
 318 #define aout_32_close_and_cleanup aout_32_bfd_free_cached_info
 319
 320 #define aout_32_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
 321
 322 #define aout_32_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
 323
 324 #define aout_32_get_section_contents_in_window \
 325   _bfd_generic_get_section_contents_in_window
 326
 327 #define os9k_bfd_get_relocated_section_contents \
 328   bfd_generic_get_relocated_section_contents
 329 #define os9k_bfd_relax_section bfd_generic_relax_section
 330 #define os9k_bfd_gc_sections bfd_generic_gc_sections
 331 #define os9k_bfd_merge_sections bfd_generic_merge_sections
 332 #define os9k_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
 333 #define os9k_bfd_link_hash_table_free _bfd_generic_link_hash_table_free
 334 #define os9k_bfd_link_add_symbols _bfd_generic_link_add_symbols
 335 #define os9k_bfd_final_link _bfd_generic_final_link
 336 #define os9k_bfd_link_split_section  _bfd_generic_link_split_section
 337
 338 const bfd_target i386os9k_vec =
 339   {
 340     "i386os9k",                 /* name */
 341     bfd_target_os9k_flavour,
 342     BFD_ENDIAN_LITTLE,          /* data byte order is little */
 343     BFD_ENDIAN_LITTLE,          /* hdr byte order is little */
 344     (HAS_RELOC | EXEC_P | WP_TEXT),     /* object flags */
 345     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD),  /* section flags */
 346     0,                          /* symbol leading char */
 347     ' ',                                /* ar_pad_char */
 348     16,                         /* ar_max_namelen */
 349
 350     bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 351     bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 352     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
 353     bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 354     bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 355     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
 356     {_bfd_dummy_target, os9k_object_p,  /* bfd_check_format */
 357      bfd_generic_archive_p, _bfd_dummy_target},
 358     {bfd_false, bfd_false,      /* bfd_set_format */
 359      _bfd_generic_mkarchive, bfd_false},
 360     {bfd_false, bfd_false,      /* bfd_write_contents */
 361      _bfd_write_archive_contents, bfd_false},
 362
 363     BFD_JUMP_TABLE_GENERIC (aout_32),
 364     BFD_JUMP_TABLE_COPY (_bfd_generic),
 365     BFD_JUMP_TABLE_CORE (_bfd_nocore),
 366     BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_bsd),
 367     BFD_JUMP_TABLE_SYMBOLS (aout_32),
 368     BFD_JUMP_TABLE_RELOCS (aout_32),
 369     BFD_JUMP_TABLE_WRITE (aout_32),
 370     BFD_JUMP_TABLE_LINK (os9k),
 371     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 372
 373     NULL,
 374
 375     (PTR) 0,
 376   };