bfd/i386os9k.c

   1 /* BFD back-end for os9000 i386 binaries.
   2    Copyright 1990, 91, 92, 93, 94, 95, 98, 1999 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 const 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 const 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 const 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     return false;
 203
 204   abfd->tdata.bout_data = rawptr;
 205   exec_hdr (abfd) = &rawptr->e;
 206
 207   obj_textsec (abfd) = (asection *) NULL;
 208   obj_datasec (abfd) = (asection *) NULL;
 209   obj_bsssec (abfd) = (asection *) NULL;
 210
 211   return true;
 212 }
 213
 214 static boolean
 215 os9k_write_object_contents (abfd)
 216      bfd *abfd;
 217 {
 218   struct external_exec swapped_hdr;
 219
 220   if (! aout_32_make_sections (abfd))
 221     return false;
 222
 223   exec_hdr (abfd)->a_info = BMAGIC;
 224
 225   exec_hdr (abfd)->a_text = obj_textsec (abfd)->_raw_size;
 226   exec_hdr (abfd)->a_data = obj_datasec (abfd)->_raw_size;
 227   exec_hdr (abfd)->a_bss = obj_bsssec (abfd)->_raw_size;
 228   exec_hdr (abfd)->a_syms = bfd_get_symcount (abfd) * sizeof (struct nlist);
 229   exec_hdr (abfd)->a_entry = bfd_get_start_address (abfd);
 230   exec_hdr (abfd)->a_trsize = ((obj_textsec (abfd)->reloc_count) *
 231                                sizeof (struct relocation_info));
 232   exec_hdr (abfd)->a_drsize = ((obj_datasec (abfd)->reloc_count) *
 233                                sizeof (struct relocation_info));
 234
 235   exec_hdr (abfd)->a_talign = obj_textsec (abfd)->alignment_power;
 236   exec_hdr (abfd)->a_dalign = obj_datasec (abfd)->alignment_power;
 237   exec_hdr (abfd)->a_balign = obj_bsssec (abfd)->alignment_power;
 238
 239   exec_hdr (abfd)->a_tload = obj_textsec (abfd)->vma;
 240   exec_hdr (abfd)->a_dload = obj_datasec (abfd)->vma;
 241
 242   bout_swap_exec_header_out (abfd, exec_hdr (abfd), &swapped_hdr);
 243
 244   if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
 245       || (bfd_write ((PTR) & swapped_hdr, 1, EXEC_BYTES_SIZE, abfd)
 246           != EXEC_BYTES_SIZE))
 247     return false;
 248
 249   /* Now write out reloc info, followed by syms and strings */
 250   if (bfd_get_symcount (abfd) != 0)
 251     {
 252       if (bfd_seek (abfd, (file_ptr) (N_SYMOFF (*exec_hdr (abfd))), SEEK_SET)
 253           != 0)
 254         return false;
 255
 256       if (!aout_32_write_syms (abfd))
 257         return false;
 258
 259       if (bfd_seek (abfd, (file_ptr) (N_TROFF (*exec_hdr (abfd))), SEEK_SET)
 260           != 0)
 261         return false;
 262
 263       if (!b_out_squirt_out_relocs (abfd, obj_textsec (abfd)))
 264         return false;
 265       if (bfd_seek (abfd, (file_ptr) (N_DROFF (*exec_hdr (abfd))), SEEK_SET)
 266           != 0)
 267         return false;
 268
 269       if (!b_out_squirt_out_relocs (abfd, obj_datasec (abfd)))
 270         return false;
 271     }
 272   return true;
 273 }
 274 \f
 275 static boolean
 276 os9k_set_section_contents (abfd, section, location, offset, count)
 277      bfd *abfd;
 278      sec_ptr section;
 279      unsigned char *location;
 280      file_ptr offset;
 281      int count;
 282 {
 283
 284   if (abfd->output_has_begun == false)
 285     {                           /* set by bfd.c handler */
 286       if (! aout_32_make_sections (abfd))
 287         return false;
 288
 289       obj_textsec (abfd)->filepos = sizeof (struct internal_exec);
 290       obj_datasec (abfd)->filepos = obj_textsec (abfd)->filepos
 291         + obj_textsec (abfd)->_raw_size;
 292
 293     }
 294   /* regardless, once we know what we're doing, we might as well get going */
 295   if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0)
 296     return false;
 297
 298   if (count != 0)
 299     {
 300       return (bfd_write ((PTR) location, 1, count, abfd) == count) ? true : false;
 301     }
 302   return true;
 303 }
 304 #endif  /* 0 */
 305
 306 static int
 307 os9k_sizeof_headers (ignore_abfd, ignore)
 308      bfd *ignore_abfd ATTRIBUTE_UNUSED;
 309      boolean ignore ATTRIBUTE_UNUSED;
 310 {
 311   return sizeof (struct internal_exec);
 312 }
 313
 314
 315 /***********************************************************************/
 316
 317 #define aout_32_close_and_cleanup aout_32_bfd_free_cached_info
 318
 319 #define aout_32_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
 320
 321 #define aout_32_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
 322
 323 #define aout_32_get_section_contents_in_window \
 324   _bfd_generic_get_section_contents_in_window
 325
 326 #define os9k_bfd_get_relocated_section_contents \
 327   bfd_generic_get_relocated_section_contents
 328 #define os9k_bfd_relax_section bfd_generic_relax_section
 329 #define os9k_bfd_gc_sections bfd_generic_gc_sections
 330 #define os9k_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
 331 #define os9k_bfd_link_add_symbols _bfd_generic_link_add_symbols
 332 #define os9k_bfd_final_link _bfd_generic_final_link
 333 #define os9k_bfd_link_split_section  _bfd_generic_link_split_section
 334
 335 const bfd_target i386os9k_vec =
 336 {
 337   "i386os9k",                   /* name */
 338   bfd_target_os9k_flavour,
 339   BFD_ENDIAN_LITTLE,            /* data byte order is little */
 340   BFD_ENDIAN_LITTLE,            /* hdr byte order is little */
 341   (HAS_RELOC | EXEC_P | WP_TEXT),       /* object flags */
 342   (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD),    /* section flags */
 343   0,                            /* symbol leading char */
 344   ' ',                          /* ar_pad_char */
 345   16,                           /* ar_max_namelen */
 346
 347   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 348   bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 349   bfd_getl16, bfd_getl_signed_16, bfd_putl16,   /* data */
 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,   /* hdrs */
 353   {_bfd_dummy_target, os9k_object_p,    /* bfd_check_format */
 354    bfd_generic_archive_p, _bfd_dummy_target},
 355   {bfd_false, bfd_false,        /* bfd_set_format */
 356    _bfd_generic_mkarchive, bfd_false},
 357   {bfd_false, bfd_false,        /* bfd_write_contents */
 358    _bfd_write_archive_contents, bfd_false},
 359
 360      BFD_JUMP_TABLE_GENERIC (aout_32),
 361      BFD_JUMP_TABLE_COPY (_bfd_generic),
 362      BFD_JUMP_TABLE_CORE (_bfd_nocore),
 363      BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_bsd),
 364      BFD_JUMP_TABLE_SYMBOLS (aout_32),
 365      BFD_JUMP_TABLE_RELOCS (aout_32),
 366      BFD_JUMP_TABLE_WRITE (aout_32),
 367      BFD_JUMP_TABLE_LINK (os9k),
 368      BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 369
 370   (PTR) 0,
 371 };