bfd/i386os9k.c

   1 /* BFD back-end for os9000 i386 binaries.
   2    Copyright 1990, 1991, 1992, 1993, 1994, 1995, 1998, 1999
   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
  32 /* Swaps the information in an executable header taken from a raw byte
  33    stream memory image, into the internal exec_header structure.  */
  34 boolean
  35 os9k_swap_exec_header_in (abfd, raw_bytes, execp)
  36      bfd *abfd;
  37      mh_com *raw_bytes;
  38      struct internal_exec *execp;
  39 {
  40   mh_com *bytes = (mh_com *) raw_bytes;
  41   unsigned int dload, dmemsize, dmemstart;
  42
  43   /* Now fill in fields in the execp, from the bytes in the raw data.  */
  44   execp->a_info = bfd_h_get_16 (abfd, bytes->m_sync);
  45   execp->a_syms = 0;
  46   execp->a_entry = bfd_h_get_32 (abfd, bytes->m_exec);
  47   execp->a_talign = 2;
  48   execp->a_dalign = 2;
  49   execp->a_balign = 2;
  50
  51   dload = bfd_h_get_32 (abfd, bytes->m_idata);
  52   execp->a_data = dload + 8;
  53
  54   if (bfd_seek (abfd, (file_ptr) dload, SEEK_SET) != 0
  55       || (bfd_read (&dmemstart, sizeof (dmemstart), 1, abfd)
  56           != sizeof (dmemstart))
  57       || (bfd_read (&dmemsize, sizeof (dmemsize), 1, abfd)
  58           != sizeof (dmemsize)))
  59     return false;
  60
  61   execp->a_tload = 0;
  62   execp->a_dload = bfd_h_get_32 (abfd, (unsigned char *) &dmemstart);
  63   execp->a_text = dload - execp->a_tload;
  64   execp->a_data = bfd_h_get_32 (abfd, (unsigned char *) &dmemsize);
  65   execp->a_bss = bfd_h_get_32 (abfd, bytes->m_data) - execp->a_data;
  66
  67   execp->a_trsize = 0;
  68   execp->a_drsize = 0;
  69
  70   return true;
  71 }
  72
  73 #if 0
  74 /* Swaps the information in an internal exec header structure into the
  75    supplied buffer ready for writing to disk.  */
  76
  77 PROTO (void, os9k_swap_exec_header_out,
  78          (bfd * abfd,
  79           struct internal_exec * execp,
  80           struct mh_com * raw_bytes));
  81 void
  82 os9k_swap_exec_header_out (abfd, execp, raw_bytes)
  83      bfd *abfd;
  84      struct internal_exec *execp;
  85      mh_com *raw_bytes;
  86 {
  87   mh_com *bytes = (mh_com *) raw_bytes;
  88
  89   /* Now fill in fields in the raw data, from the fields in the exec struct. */
  90   bfd_h_put_32 (abfd, execp->a_info, bytes->e_info);
  91   bfd_h_put_32 (abfd, execp->a_text, bytes->e_text);
  92   bfd_h_put_32 (abfd, execp->a_data, bytes->e_data);
  93   bfd_h_put_32 (abfd, execp->a_bss, bytes->e_bss);
  94   bfd_h_put_32 (abfd, execp->a_syms, bytes->e_syms);
  95   bfd_h_put_32 (abfd, execp->a_entry, bytes->e_entry);
  96   bfd_h_put_32 (abfd, execp->a_trsize, bytes->e_trsize);
  97   bfd_h_put_32 (abfd, execp->a_drsize, bytes->e_drsize);
  98   bfd_h_put_32 (abfd, execp->a_tload, bytes->e_tload);
  99   bfd_h_put_32 (abfd, execp->a_dload, bytes->e_dload);
 100   bytes->e_talign[0] = execp->a_talign;
 101   bytes->e_dalign[0] = execp->a_dalign;
 102   bytes->e_balign[0] = execp->a_balign;
 103   bytes->e_relaxable[0] = execp->a_relaxable;
 104 }
 105
 106 #endif  /* 0 */
 107
 108 static const bfd_target *
 109 os9k_object_p (abfd)
 110      bfd *abfd;
 111 {
 112   struct internal_exec anexec;
 113   mh_com exec_bytes;
 114
 115   if (bfd_read ((PTR) & exec_bytes, MHCOM_BYTES_SIZE, 1, abfd)
 116       != MHCOM_BYTES_SIZE)
 117     {
 118       if (bfd_get_error () != bfd_error_system_call)
 119         bfd_set_error (bfd_error_wrong_format);
 120       return 0;
 121     }
 122
 123   anexec.a_info = bfd_h_get_16 (abfd, exec_bytes.m_sync);
 124   if (N_BADMAG (anexec))
 125     {
 126       bfd_set_error (bfd_error_wrong_format);
 127       return 0;
 128     }
 129
 130   if (! os9k_swap_exec_header_in (abfd, &exec_bytes, &anexec))
 131     {
 132       if (bfd_get_error () != bfd_error_system_call)
 133         bfd_set_error (bfd_error_wrong_format);
 134       return NULL;
 135     }
 136   return aout_32_some_aout_object_p (abfd, &anexec, os9k_callback);
 137 }
 138
 139
 140 /* Finish up the opening of a b.out file for reading.  Fill in all the
 141    fields that are not handled by common code.  */
 142
 143 static const bfd_target *
 144 os9k_callback (abfd)
 145      bfd *abfd;
 146 {
 147   struct internal_exec *execp = exec_hdr (abfd);
 148   unsigned long bss_start;
 149
 150   /* Architecture and machine type */
 151   bfd_set_arch_mach (abfd, bfd_arch_i386, 0);
 152
 153   /* The positions of the string table and symbol table.  */
 154   obj_str_filepos (abfd) = 0;
 155   obj_sym_filepos (abfd) = 0;
 156
 157   /* The alignments of the sections */
 158   obj_textsec (abfd)->alignment_power = execp->a_talign;
 159   obj_datasec (abfd)->alignment_power = execp->a_dalign;
 160   obj_bsssec (abfd)->alignment_power = execp->a_balign;
 161
 162   /* The starting addresses of the sections.  */
 163   obj_textsec (abfd)->vma = execp->a_tload;
 164   obj_datasec (abfd)->vma = execp->a_dload;
 165
 166   /* And reload the sizes, since the aout module zaps them */
 167   obj_textsec (abfd)->_raw_size = execp->a_text;
 168
 169   bss_start = execp->a_dload + execp->a_data;   /* BSS = end of data section */
 170   obj_bsssec (abfd)->vma = align_power (bss_start, execp->a_balign);
 171
 172   /* The file positions of the sections */
 173   obj_textsec (abfd)->filepos = execp->a_entry;
 174   obj_datasec (abfd)->filepos = execp->a_dload;
 175
 176   /* The file positions of the relocation info ***
 177   obj_textsec (abfd)->rel_filepos = N_TROFF(*execp);
 178   obj_datasec (abfd)->rel_filepos =  N_DROFF(*execp);
 179   */
 180
 181   adata (abfd).page_size = 1;   /* Not applicable. */
 182   adata (abfd).segment_size = 1;/* Not applicable. */
 183   adata (abfd).exec_bytes_size = MHCOM_BYTES_SIZE;
 184
 185   return abfd->xvec;
 186 }
 187
 188 #if 0
 189 struct bout_data_struct
 190 {
 191   struct aoutdata a;
 192   struct internal_exec e;
 193 };
 194
 195 static boolean
 196 os9k_mkobject (abfd)
 197      bfd *abfd;
 198 {
 199   struct bout_data_struct *rawptr;
 200
 201   rawptr = (struct bout_data_struct *) bfd_zalloc (abfd, sizeof (struct bout_data_struct));
 202   if (rawptr == NULL)
 203     return false;
 204
 205   abfd->tdata.bout_data = rawptr;
 206   exec_hdr (abfd) = &rawptr->e;
 207
 208   obj_textsec (abfd) = (asection *) NULL;
 209   obj_datasec (abfd) = (asection *) NULL;
 210   obj_bsssec (abfd) = (asection *) NULL;
 211
 212   return true;
 213 }
 214
 215 static boolean
 216 os9k_write_object_contents (abfd)
 217      bfd *abfd;
 218 {
 219   struct external_exec swapped_hdr;
 220
 221   if (! aout_32_make_sections (abfd))
 222     return false;
 223
 224   exec_hdr (abfd)->a_info = BMAGIC;
 225
 226   exec_hdr (abfd)->a_text = obj_textsec (abfd)->_raw_size;
 227   exec_hdr (abfd)->a_data = obj_datasec (abfd)->_raw_size;
 228   exec_hdr (abfd)->a_bss = obj_bsssec (abfd)->_raw_size;
 229   exec_hdr (abfd)->a_syms = bfd_get_symcount (abfd) * sizeof (struct nlist);
 230   exec_hdr (abfd)->a_entry = bfd_get_start_address (abfd);
 231   exec_hdr (abfd)->a_trsize = ((obj_textsec (abfd)->reloc_count) *
 232                                sizeof (struct relocation_info));
 233   exec_hdr (abfd)->a_drsize = ((obj_datasec (abfd)->reloc_count) *
 234                                sizeof (struct relocation_info));
 235
 236   exec_hdr (abfd)->a_talign = obj_textsec (abfd)->alignment_power;
 237   exec_hdr (abfd)->a_dalign = obj_datasec (abfd)->alignment_power;
 238   exec_hdr (abfd)->a_balign = obj_bsssec (abfd)->alignment_power;
 239
 240   exec_hdr (abfd)->a_tload = obj_textsec (abfd)->vma;
 241   exec_hdr (abfd)->a_dload = obj_datasec (abfd)->vma;
 242
 243   bout_swap_exec_header_out (abfd, exec_hdr (abfd), &swapped_hdr);
 244
 245   if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
 246       || (bfd_write ((PTR) & swapped_hdr, 1, EXEC_BYTES_SIZE, abfd)
 247           != EXEC_BYTES_SIZE))
 248     return false;
 249
 250   /* Now write out reloc info, followed by syms and strings */
 251   if (bfd_get_symcount (abfd) != 0)
 252     {
 253       if (bfd_seek (abfd, (file_ptr) (N_SYMOFF (*exec_hdr (abfd))), SEEK_SET)
 254           != 0)
 255         return false;
 256
 257       if (!aout_32_write_syms (abfd))
 258         return false;
 259
 260       if (bfd_seek (abfd, (file_ptr) (N_TROFF (*exec_hdr (abfd))), SEEK_SET)
 261           != 0)
 262         return false;
 263
 264       if (!b_out_squirt_out_relocs (abfd, obj_textsec (abfd)))
 265         return false;
 266       if (bfd_seek (abfd, (file_ptr) (N_DROFF (*exec_hdr (abfd))), SEEK_SET)
 267           != 0)
 268         return false;
 269
 270       if (!b_out_squirt_out_relocs (abfd, obj_datasec (abfd)))
 271         return false;
 272     }
 273   return true;
 274 }
 275 \f
 276 static boolean
 277 os9k_set_section_contents (abfd, section, location, offset, count)
 278      bfd *abfd;
 279      sec_ptr section;
 280      unsigned char *location;
 281      file_ptr offset;
 282      int count;
 283 {
 284
 285   if (abfd->output_has_begun == false)
 286     {                           /* set by bfd.c handler */
 287       if (! aout_32_make_sections (abfd))
 288         return false;
 289
 290       obj_textsec (abfd)->filepos = sizeof (struct internal_exec);
 291       obj_datasec (abfd)->filepos = obj_textsec (abfd)->filepos
 292         + obj_textsec (abfd)->_raw_size;
 293
 294     }
 295   /* regardless, once we know what we're doing, we might as well get going */
 296   if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0)
 297     return false;
 298
 299   if (count != 0)
 300     {
 301       return (bfd_write ((PTR) location, 1, count, abfd) == count) ? true : false;
 302     }
 303   return true;
 304 }
 305 #endif  /* 0 */
 306
 307 static int
 308 os9k_sizeof_headers (ignore_abfd, ignore)
 309      bfd *ignore_abfd ATTRIBUTE_UNUSED;
 310      boolean ignore ATTRIBUTE_UNUSED;
 311 {
 312   return sizeof (struct internal_exec);
 313 }
 314
 315
 316 /***********************************************************************/
 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_add_symbols _bfd_generic_link_add_symbols
 334 #define os9k_bfd_final_link _bfd_generic_final_link
 335 #define os9k_bfd_link_split_section  _bfd_generic_link_split_section
 336
 337 const bfd_target i386os9k_vec =
 338 {
 339   "i386os9k",                   /* name */
 340   bfd_target_os9k_flavour,
 341   BFD_ENDIAN_LITTLE,            /* data byte order is little */
 342   BFD_ENDIAN_LITTLE,            /* hdr byte order is little */
 343   (HAS_RELOC | EXEC_P | WP_TEXT),       /* object flags */
 344   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD),    /* section flags */
 345   0,                            /* symbol leading char */
 346   ' ',                          /* ar_pad_char */
 347   16,                           /* ar_max_namelen */
 348
 349   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 350   bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 351   bfd_getl16, bfd_getl_signed_16, bfd_putl16,   /* data */
 352   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 353   bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 354   bfd_getl16, bfd_getl_signed_16, bfd_putl16,   /* hdrs */
 355   {_bfd_dummy_target, os9k_object_p,    /* bfd_check_format */
 356    bfd_generic_archive_p, _bfd_dummy_target},
 357   {bfd_false, bfd_false,        /* bfd_set_format */
 358    _bfd_generic_mkarchive, bfd_false},
 359   {bfd_false, bfd_false,        /* bfd_write_contents */
 360    _bfd_write_archive_contents, bfd_false},
 361
 362      BFD_JUMP_TABLE_GENERIC (aout_32),
 363      BFD_JUMP_TABLE_COPY (_bfd_generic),
 364      BFD_JUMP_TABLE_CORE (_bfd_nocore),
 365      BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_bsd),
 366      BFD_JUMP_TABLE_SYMBOLS (aout_32),
 367      BFD_JUMP_TABLE_RELOCS (aout_32),
 368      BFD_JUMP_TABLE_WRITE (aout_32),
 369      BFD_JUMP_TABLE_LINK (os9k),
 370      BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 371
 372   NULL,
 373
 374   (PTR) 0,
 375 };