bfd/i386os9k.c

   1 /* BFD back-end for os9000 i386 binaries.
   2    Copyright 1990, 1991, 1992, 1993, 1994 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 2 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., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21
  22 #include "bfd.h"
  23 #include "sysdep.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 static bfd_target *os9k_callback PARAMS ((bfd *));
  30
  31 /* Swaps the information in an executable header taken from a raw byte
  32    stream memory image, into the internal exec_header structure.  */
  33 boolean
  34 os9k_swap_exec_header_in (abfd, raw_bytes, execp)
  35      bfd *abfd;
  36      mh_com *raw_bytes;
  37      struct internal_exec *execp;
  38 {
  39   mh_com *bytes = (mh_com *) raw_bytes;
  40   unsigned int dload, dmemsize, dmemstart;
  41
  42   /* Now fill in fields in the execp, from the bytes in the raw data.  */
  43   execp->a_info = bfd_h_get_16 (abfd, bytes->m_sync);
  44   execp->a_syms = 0;
  45   execp->a_entry = bfd_h_get_32 (abfd, bytes->m_exec);
  46   execp->a_talign = 2;
  47   execp->a_dalign = 2;
  48   execp->a_balign = 2;
  49
  50   dload = bfd_h_get_32 (abfd, bytes->m_idata);
  51   execp->a_data = dload + 8;
  52
  53   if (bfd_seek (abfd, (file_ptr) dload, SEEK_SET) != 0
  54       || (bfd_read (&dmemstart, sizeof (dmemstart), 1, abfd)
  55           != sizeof (dmemstart))
  56       || (bfd_read (&dmemsize, sizeof (dmemsize), 1, abfd)
  57           != sizeof (dmemsize)))
  58     return false;
  59
  60   execp->a_tload = 0;
  61   execp->a_dload = bfd_h_get_32 (abfd, (unsigned char *) &dmemstart);
  62   execp->a_text = dload - execp->a_tload;
  63   execp->a_data = bfd_h_get_32 (abfd, (unsigned char *) &dmemsize);
  64   execp->a_bss = bfd_h_get_32 (abfd, bytes->m_data) - execp->a_data;
  65
  66   execp->a_trsize = 0;
  67   execp->a_drsize = 0;
  68
  69   return true;
  70 }
  71
  72 #if 0
  73 /* Swaps the information in an internal exec header structure into the
  74    supplied buffer ready for writing to disk.  */
  75
  76 PROTO (void, os9k_swap_exec_header_out,
  77          (bfd * abfd,
  78           struct internal_exec * execp,
  79           struct mh_com * raw_bytes));
  80 void
  81 os9k_swap_exec_header_out (abfd, execp, raw_bytes)
  82      bfd *abfd;
  83      struct internal_exec *execp;
  84      mh_com *raw_bytes;
  85 {
  86   mh_com *bytes = (mh_com *) raw_bytes;
  87
  88   /* Now fill in fields in the raw data, from the fields in the exec struct. */
  89   bfd_h_put_32 (abfd, execp->a_info, bytes->e_info);
  90   bfd_h_put_32 (abfd, execp->a_text, bytes->e_text);
  91   bfd_h_put_32 (abfd, execp->a_data, bytes->e_data);
  92   bfd_h_put_32 (abfd, execp->a_bss, bytes->e_bss);
  93   bfd_h_put_32 (abfd, execp->a_syms, bytes->e_syms);
  94   bfd_h_put_32 (abfd, execp->a_entry, bytes->e_entry);
  95   bfd_h_put_32 (abfd, execp->a_trsize, bytes->e_trsize);
  96   bfd_h_put_32 (abfd, execp->a_drsize, bytes->e_drsize);
  97   bfd_h_put_32 (abfd, execp->a_tload, bytes->e_tload);
  98   bfd_h_put_32 (abfd, execp->a_dload, bytes->e_dload);
  99   bytes->e_talign[0] = execp->a_talign;
 100   bytes->e_dalign[0] = execp->a_dalign;
 101   bytes->e_balign[0] = execp->a_balign;
 102   bytes->e_relaxable[0] = execp->a_relaxable;
 103 }
 104
 105 #endif  /* 0 */
 106
 107 static bfd_target *
 108 os9k_object_p (abfd)
 109      bfd *abfd;
 110 {
 111   struct internal_exec anexec;
 112   mh_com exec_bytes;
 113
 114   if (bfd_read ((PTR) & exec_bytes, MHCOM_BYTES_SIZE, 1, abfd)
 115       != MHCOM_BYTES_SIZE)
 116     {
 117       if (bfd_get_error () != bfd_error_system_call)
 118         bfd_set_error (bfd_error_wrong_format);
 119       return 0;
 120     }
 121
 122   anexec.a_info = bfd_h_get_16 (abfd, exec_bytes.m_sync);
 123   if (N_BADMAG (anexec))
 124     {
 125       bfd_set_error (bfd_error_wrong_format);
 126       return 0;
 127     }
 128
 129   if (! os9k_swap_exec_header_in (abfd, &exec_bytes, &anexec))
 130     {
 131       if (bfd_get_error () != bfd_error_system_call)
 132         bfd_set_error (bfd_error_wrong_format);
 133       return NULL;
 134     }
 135   return aout_32_some_aout_object_p (abfd, &anexec, os9k_callback);
 136 }
 137
 138
 139 /* Finish up the opening of a b.out file for reading.  Fill in all the
 140    fields that are not handled by common code.  */
 141
 142 static bfd_target *
 143 os9k_callback (abfd)
 144      bfd *abfd;
 145 {
 146   struct internal_exec *execp = exec_hdr (abfd);
 147   unsigned long bss_start;
 148
 149   /* Architecture and machine type */
 150   bfd_set_arch_mach (abfd, bfd_arch_i386, 0);
 151
 152   /* The positions of the string table and symbol table.  */
 153   obj_str_filepos (abfd) = 0;
 154   obj_sym_filepos (abfd) = 0;
 155
 156   /* The alignments of the sections */
 157   obj_textsec (abfd)->alignment_power = execp->a_talign;
 158   obj_datasec (abfd)->alignment_power = execp->a_dalign;
 159   obj_bsssec (abfd)->alignment_power = execp->a_balign;
 160
 161   /* The starting addresses of the sections.  */
 162   obj_textsec (abfd)->vma = execp->a_tload;
 163   obj_datasec (abfd)->vma = execp->a_dload;
 164
 165   /* And reload the sizes, since the aout module zaps them */
 166   obj_textsec (abfd)->_raw_size = execp->a_text;
 167
 168   bss_start = execp->a_dload + execp->a_data;   /* BSS = end of data section */
 169   obj_bsssec (abfd)->vma = align_power (bss_start, execp->a_balign);
 170
 171   /* The file positions of the sections */
 172   obj_textsec (abfd)->filepos = execp->a_entry;
 173   obj_datasec (abfd)->filepos = execp->a_dload;
 174
 175   /* The file positions of the relocation info ***
 176   obj_textsec (abfd)->rel_filepos = N_TROFF(*execp);
 177   obj_datasec (abfd)->rel_filepos =  N_DROFF(*execp);
 178   */
 179
 180   adata (abfd).page_size = 1;   /* Not applicable. */
 181   adata (abfd).segment_size = 1;/* Not applicable. */
 182   adata (abfd).exec_bytes_size = MHCOM_BYTES_SIZE;
 183
 184   return abfd->xvec;
 185 }
 186
 187 #if 0
 188 struct bout_data_struct
 189 {
 190   struct aoutdata a;
 191   struct internal_exec e;
 192 };
 193
 194 static boolean
 195 os9k_mkobject (abfd)
 196      bfd *abfd;
 197 {
 198   struct bout_data_struct *rawptr;
 199
 200   rawptr = (struct bout_data_struct *) bfd_zalloc (abfd, sizeof (struct bout_data_struct));
 201   if (rawptr == NULL)
 202     {
 203       bfd_set_error (bfd_error_no_memory);
 204       return false;
 205     }
 206
 207   abfd->tdata.bout_data = rawptr;
 208   exec_hdr (abfd) = &rawptr->e;
 209
 210   /* For simplicity's sake we just make all the sections right here. */
 211   obj_textsec (abfd) = (asection *) NULL;
 212   obj_datasec (abfd) = (asection *) NULL;
 213   obj_bsssec (abfd) = (asection *) NULL;
 214
 215   bfd_make_section (abfd, ".text");
 216   bfd_make_section (abfd, ".data");
 217   bfd_make_section (abfd, ".bss");
 218
 219   return true;
 220 }
 221
 222 static boolean
 223 os9k_write_object_contents (abfd)
 224      bfd *abfd;
 225 {
 226   struct external_exec swapped_hdr;
 227
 228   exec_hdr (abfd)->a_info = BMAGIC;
 229
 230   exec_hdr (abfd)->a_text = obj_textsec (abfd)->_raw_size;
 231   exec_hdr (abfd)->a_data = obj_datasec (abfd)->_raw_size;
 232   exec_hdr (abfd)->a_bss = obj_bsssec (abfd)->_raw_size;
 233   exec_hdr (abfd)->a_syms = bfd_get_symcount (abfd) * sizeof (struct nlist);
 234   exec_hdr (abfd)->a_entry = bfd_get_start_address (abfd);
 235   exec_hdr (abfd)->a_trsize = ((obj_textsec (abfd)->reloc_count) *
 236                                sizeof (struct relocation_info));
 237   exec_hdr (abfd)->a_drsize = ((obj_datasec (abfd)->reloc_count) *
 238                                sizeof (struct relocation_info));
 239
 240   exec_hdr (abfd)->a_talign = obj_textsec (abfd)->alignment_power;
 241   exec_hdr (abfd)->a_dalign = obj_datasec (abfd)->alignment_power;
 242   exec_hdr (abfd)->a_balign = obj_bsssec (abfd)->alignment_power;
 243
 244   exec_hdr (abfd)->a_tload = obj_textsec (abfd)->vma;
 245   exec_hdr (abfd)->a_dload = obj_datasec (abfd)->vma;
 246
 247   bout_swap_exec_header_out (abfd, exec_hdr (abfd), &swapped_hdr);
 248
 249   if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
 250       || (bfd_write ((PTR) & swapped_hdr, 1, EXEC_BYTES_SIZE, abfd)
 251           != EXEC_BYTES_SIZE))
 252     return false;
 253
 254   /* Now write out reloc info, followed by syms and strings */
 255   if (bfd_get_symcount (abfd) != 0)
 256     {
 257       if (bfd_seek (abfd, (file_ptr) (N_SYMOFF (*exec_hdr (abfd))), SEEK_SET)
 258           != 0)
 259         return false;
 260
 261       if (!aout_32_write_syms (abfd))
 262         return false;
 263
 264       if (bfd_seek (abfd, (file_ptr) (N_TROFF (*exec_hdr (abfd))), SEEK_SET)
 265           != 0)
 266         return false;
 267
 268       if (!b_out_squirt_out_relocs (abfd, obj_textsec (abfd)))
 269         return false;
 270       if (bfd_seek (abfd, (file_ptr) (N_DROFF (*exec_hdr (abfd))), SEEK_SET)
 271           != 0)
 272         return false;
 273
 274       if (!b_out_squirt_out_relocs (abfd, obj_datasec (abfd)))
 275         return false;
 276     }
 277   return true;
 278 }
 279 \f
 280 static boolean
 281 os9k_set_section_contents (abfd, section, location, offset, count)
 282      bfd *abfd;
 283      sec_ptr section;
 284      unsigned char *location;
 285      file_ptr offset;
 286      int count;
 287 {
 288
 289   if (abfd->output_has_begun == false)
 290     {                           /* set by bfd.c handler */
 291       if ((obj_textsec (abfd) == NULL) || (obj_datasec (abfd) == NULL)  /*||
 292                   (obj_textsec (abfd)->_cooked_size == 0) || (obj_datasec (abfd)->_cooked_size == 0)*/ )
 293         {
 294           bfd_set_error (bfd_error_invalid_operation);
 295           return false;
 296         }
 297
 298       obj_textsec (abfd)->filepos = sizeof (struct internal_exec);
 299       obj_datasec (abfd)->filepos = obj_textsec (abfd)->filepos
 300         + obj_textsec (abfd)->_raw_size;
 301
 302     }
 303   /* regardless, once we know what we're doing, we might as well get going */
 304   if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0)
 305     return false;
 306
 307   if (count != 0)
 308     {
 309       return (bfd_write ((PTR) location, 1, count, abfd) == count) ? true : false;
 310     }
 311   return true;
 312 }
 313 #endif  /* 0 */
 314
 315 static int
 316 os9k_sizeof_headers (ignore_abfd, ignore)
 317      bfd *ignore_abfd;
 318      boolean ignore;
 319 {
 320   return sizeof (struct internal_exec);
 321 }
 322
 323
 324 /***********************************************************************/
 325
 326 #define aout_32_close_and_cleanup aout_32_bfd_free_cached_info
 327
 328 #define aout_32_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
 329
 330 #define aout_32_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
 331
 332 #define os9k_bfd_get_relocated_section_contents \
 333   bfd_generic_get_relocated_section_contents
 334 #define os9k_bfd_relax_section bfd_generic_relax_section
 335 #define os9k_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
 336 #define os9k_bfd_link_add_symbols _bfd_generic_link_add_symbols
 337 #define os9k_bfd_final_link _bfd_generic_final_link
 338
 339 bfd_target i386os9k_vec =
 340 {
 341   "i386os9k",                   /* name */
 342   bfd_target_os9k_flavour,
 343   false,                        /* data byte order is little */
 344   false,                        /* hdr byte order is big */
 345   (HAS_RELOC | EXEC_P | WP_TEXT),       /* object flags */
 346   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD),    /* section flags */
 347   0,                            /* symbol leading char */
 348   ' ',                          /* ar_pad_char */
 349   16,                           /* ar_max_namelen */
 350   2,                            /* minumum alignment power */
 351
 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,   /* data */
 355   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 356   bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 357   bfd_getl16, bfd_getl_signed_16, bfd_putl16,   /* hdrs */
 358   {_bfd_dummy_target, os9k_object_p,    /* bfd_check_format */
 359    bfd_generic_archive_p, _bfd_dummy_target},
 360   {bfd_false, bfd_false,        /* bfd_set_format */
 361    _bfd_generic_mkarchive, bfd_false},
 362   {bfd_false, bfd_false,        /* bfd_write_contents */
 363    _bfd_write_archive_contents, bfd_false},
 364
 365      BFD_JUMP_TABLE_GENERIC (aout_32),
 366      BFD_JUMP_TABLE_COPY (_bfd_generic),
 367      BFD_JUMP_TABLE_CORE (_bfd_nocore),
 368      BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_bsd),
 369      BFD_JUMP_TABLE_SYMBOLS (aout_32),
 370      BFD_JUMP_TABLE_RELOCS (aout_32),
 371      BFD_JUMP_TABLE_WRITE (aout_32),
 372      BFD_JUMP_TABLE_LINK (os9k),
 373      BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 374
 375   (PTR) 0,
 376 };