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
  31   PARAMS ((bfd *));
  32 static const bfd_target * os9k_object_p
  33   PARAMS ((bfd *));
  34 static int os9k_sizeof_headers
  35   PARAMS ((bfd *, bfd_boolean));
  36 bfd_boolean os9k_swap_exec_header_in
  37   PARAMS ((bfd *, mh_com *, struct internal_exec *));
  38
  39 /* Swaps the information in an executable header taken from a raw byte
  40    stream memory image, into the internal exec_header structure.  */
  41 bfd_boolean
  42 os9k_swap_exec_header_in (abfd, raw_bytes, execp)
  43      bfd *abfd;
  44      mh_com *raw_bytes;
  45      struct internal_exec *execp;
  46 {
  47   mh_com *bytes = (mh_com *) raw_bytes;
  48   unsigned int dload, dmemsize, dmemstart;
  49
  50   /* Now fill in fields in the execp, from the bytes in the raw data.  */
  51   execp->a_info = H_GET_16 (abfd, bytes->m_sync);
  52   execp->a_syms = 0;
  53   execp->a_entry = H_GET_32 (abfd, bytes->m_exec);
  54   execp->a_talign = 2;
  55   execp->a_dalign = 2;
  56   execp->a_balign = 2;
  57
  58   dload = H_GET_32 (abfd, bytes->m_idata);
  59   execp->a_data = dload + 8;
  60
  61   if (bfd_seek (abfd, (file_ptr) dload, SEEK_SET) != 0
  62       || (bfd_bread (&dmemstart, (bfd_size_type) sizeof (dmemstart), abfd)
  63           != sizeof (dmemstart))
  64       || (bfd_bread (&dmemsize, (bfd_size_type) sizeof (dmemsize), abfd)
  65           != sizeof (dmemsize)))
  66     return FALSE;
  67
  68   execp->a_tload = 0;
  69   execp->a_dload = H_GET_32 (abfd, (unsigned char *) &dmemstart);
  70   execp->a_text = dload - execp->a_tload;
  71   execp->a_data = H_GET_32 (abfd, (unsigned char *) &dmemsize);
  72   execp->a_bss = H_GET_32 (abfd, bytes->m_data) - execp->a_data;
  73
  74   execp->a_trsize = 0;
  75   execp->a_drsize = 0;
  76
  77   return TRUE;
  78 }
  79
  80 #if 0
  81 /* Swaps the information in an internal exec header structure into the
  82    supplied buffer ready for writing to disk.  */
  83
  84 void os9k_swap_exec_header_out
  85   PARAMS ((bfd *, struct internal_exec *, struct mh_com *));
  86
  87 void
  88 os9k_swap_exec_header_out (abfd, execp, raw_bytes)
  89      bfd *abfd;
  90      struct internal_exec *execp;
  91      mh_com *raw_bytes;
  92 {
  93   mh_com *bytes = (mh_com *) raw_bytes;
  94
  95   /* Now fill in fields in the raw data, from the fields in the exec struct. */
  96   H_PUT_32 (abfd, execp->a_info, bytes->e_info);
  97   H_PUT_32 (abfd, execp->a_text, bytes->e_text);
  98   H_PUT_32 (abfd, execp->a_data, bytes->e_data);
  99   H_PUT_32 (abfd, execp->a_bss, bytes->e_bss);
 100   H_PUT_32 (abfd, execp->a_syms, bytes->e_syms);
 101   H_PUT_32 (abfd, execp->a_entry, bytes->e_entry);
 102   H_PUT_32 (abfd, execp->a_trsize, bytes->e_trsize);
 103   H_PUT_32 (abfd, execp->a_drsize, bytes->e_drsize);
 104   H_PUT_32 (abfd, execp->a_tload, bytes->e_tload);
 105   H_PUT_32 (abfd, execp->a_dload, bytes->e_dload);
 106   bytes->e_talign[0] = execp->a_talign;
 107   bytes->e_dalign[0] = execp->a_dalign;
 108   bytes->e_balign[0] = execp->a_balign;
 109   bytes->e_relaxable[0] = execp->a_relaxable;
 110 }
 111
 112 #endif  /* 0 */
 113
 114 static const bfd_target *
 115 os9k_object_p (abfd)
 116      bfd *abfd;
 117 {
 118   struct internal_exec anexec;
 119   mh_com exec_bytes;
 120
 121   if (bfd_bread ((PTR) &exec_bytes, (bfd_size_type) MHCOM_BYTES_SIZE, abfd)
 122       != MHCOM_BYTES_SIZE)
 123     {
 124       if (bfd_get_error () != bfd_error_system_call)
 125         bfd_set_error (bfd_error_wrong_format);
 126       return 0;
 127     }
 128
 129   anexec.a_info = H_GET_16 (abfd, exec_bytes.m_sync);
 130   if (N_BADMAG (anexec))
 131     {
 132       bfd_set_error (bfd_error_wrong_format);
 133       return 0;
 134     }
 135
 136   if (! os9k_swap_exec_header_in (abfd, &exec_bytes, &anexec))
 137     {
 138       if (bfd_get_error () != bfd_error_system_call)
 139         bfd_set_error (bfd_error_wrong_format);
 140       return NULL;
 141     }
 142   return aout_32_some_aout_object_p (abfd, &anexec, os9k_callback);
 143 }
 144
 145
 146 /* Finish up the opening of a b.out file for reading.  Fill in all the
 147    fields that are not handled by common code.  */
 148
 149 static const bfd_target *
 150 os9k_callback (abfd)
 151      bfd *abfd;
 152 {
 153   struct internal_exec *execp = exec_hdr (abfd);
 154   unsigned long bss_start;
 155
 156   /* Architecture and machine type.  */
 157   bfd_set_arch_mach (abfd, bfd_arch_i386, 0);
 158
 159   /* The positions of the string table and symbol table.  */
 160   obj_str_filepos (abfd) = 0;
 161   obj_sym_filepos (abfd) = 0;
 162
 163   /* The alignments of the sections.  */
 164   obj_textsec (abfd)->alignment_power = execp->a_talign;
 165   obj_datasec (abfd)->alignment_power = execp->a_dalign;
 166   obj_bsssec (abfd)->alignment_power = execp->a_balign;
 167
 168   /* The starting addresses of the sections.  */
 169   obj_textsec (abfd)->vma = execp->a_tload;
 170   obj_datasec (abfd)->vma = execp->a_dload;
 171
 172   /* And reload the sizes, since the aout module zaps them.  */
 173   obj_textsec (abfd)->_raw_size = execp->a_text;
 174
 175   bss_start = execp->a_dload + execp->a_data;   /* BSS = end of data section.  */
 176   obj_bsssec (abfd)->vma = align_power (bss_start, execp->a_balign);
 177
 178   /* The file positions of the sections.  */
 179   obj_textsec (abfd)->filepos = execp->a_entry;
 180   obj_datasec (abfd)->filepos = execp->a_dload;
 181
 182   /* The file positions of the relocation info ***
 183   obj_textsec (abfd)->rel_filepos = N_TROFF(*execp);
 184   obj_datasec (abfd)->rel_filepos =  N_DROFF(*execp);  */
 185
 186   adata (abfd).page_size = 1;   /* Not applicable.  */
 187   adata (abfd).segment_size = 1;/* Not applicable.  */
 188   adata (abfd).exec_bytes_size = MHCOM_BYTES_SIZE;
 189
 190   return abfd->xvec;
 191 }
 192
 193 #if 0
 194 struct bout_data_struct
 195 {
 196   struct aoutdata a;
 197   struct internal_exec e;
 198 };
 199
 200 static bfd_boolean
 201 os9k_mkobject (abfd)
 202      bfd *abfd;
 203 {
 204   struct bout_data_struct *rawptr;
 205   bfd_size_type amt = sizeof (struct bout_data_struct);
 206
 207   rawptr = (struct bout_data_struct *) bfd_zalloc (abfd, amt);
 208   if (rawptr == NULL)
 209     return FALSE;
 210
 211   abfd->tdata.bout_data = rawptr;
 212   exec_hdr (abfd) = &rawptr->e;
 213
 214   obj_textsec (abfd) = (asection *) NULL;
 215   obj_datasec (abfd) = (asection *) NULL;
 216   obj_bsssec (abfd) = (asection *) NULL;
 217
 218   return TRUE;
 219 }
 220
 221 static bfd_boolean
 222 os9k_write_object_contents (abfd)
 223      bfd *abfd;
 224 {
 225   struct external_exec swapped_hdr;
 226
 227   if (! aout_32_make_sections (abfd))
 228     return FALSE;
 229
 230   exec_hdr (abfd)->a_info = BMAGIC;
 231
 232   exec_hdr (abfd)->a_text = obj_textsec (abfd)->_raw_size;
 233   exec_hdr (abfd)->a_data = obj_datasec (abfd)->_raw_size;
 234   exec_hdr (abfd)->a_bss = obj_bsssec (abfd)->_raw_size;
 235   exec_hdr (abfd)->a_syms = bfd_get_symcount (abfd) * sizeof (struct nlist);
 236   exec_hdr (abfd)->a_entry = bfd_get_start_address (abfd);
 237   exec_hdr (abfd)->a_trsize = ((obj_textsec (abfd)->reloc_count) *
 238                                sizeof (struct relocation_info));
 239   exec_hdr (abfd)->a_drsize = ((obj_datasec (abfd)->reloc_count) *
 240                                sizeof (struct relocation_info));
 241
 242   exec_hdr (abfd)->a_talign = obj_textsec (abfd)->alignment_power;
 243   exec_hdr (abfd)->a_dalign = obj_datasec (abfd)->alignment_power;
 244   exec_hdr (abfd)->a_balign = obj_bsssec (abfd)->alignment_power;
 245
 246   exec_hdr (abfd)->a_tload = obj_textsec (abfd)->vma;
 247   exec_hdr (abfd)->a_dload = obj_datasec (abfd)->vma;
 248
 249   bout_swap_exec_header_out (abfd, exec_hdr (abfd), &swapped_hdr);
 250
 251   if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
 252       || bfd_bwrite ((PTR) & swapped_hdr, (bfd_size_type) EXEC_BYTES_SIZE,
 253                     abfd) != EXEC_BYTES_SIZE)
 254     return FALSE;
 255
 256   /* Now write out reloc info, followed by syms and strings.  */
 257   if (bfd_get_symcount (abfd) != 0)
 258     {
 259       if (bfd_seek (abfd, (file_ptr) (N_SYMOFF (*exec_hdr (abfd))), SEEK_SET)
 260           != 0)
 261         return FALSE;
 262
 263       if (!aout_32_write_syms (abfd))
 264         return FALSE;
 265
 266       if (bfd_seek (abfd, (file_ptr) (N_TROFF (*exec_hdr (abfd))), SEEK_SET)
 267           != 0)
 268         return FALSE;
 269
 270       if (!b_out_squirt_out_relocs (abfd, obj_textsec (abfd)))
 271         return FALSE;
 272       if (bfd_seek (abfd, (file_ptr) (N_DROFF (*exec_hdr (abfd))), SEEK_SET)
 273           != 0)
 274         return FALSE;
 275
 276       if (!b_out_squirt_out_relocs (abfd, obj_datasec (abfd)))
 277         return FALSE;
 278     }
 279   return TRUE;
 280 }
 281 \f
 282 static bfd_boolean
 283 os9k_set_section_contents (abfd, section, location, offset, count)
 284      bfd *abfd;
 285      sec_ptr section;
 286      unsigned char *location;
 287      file_ptr offset;
 288      int count;
 289 {
 290
 291   if (! abfd->output_has_begun)
 292     {                           /* set by bfd.c handler */
 293       if (! aout_32_make_sections (abfd))
 294         return FALSE;
 295
 296       obj_textsec (abfd)->filepos = sizeof (struct internal_exec);
 297       obj_datasec (abfd)->filepos = obj_textsec (abfd)->filepos
 298         + obj_textsec (abfd)->_raw_size;
 299
 300     }
 301   /* Regardless, once we know what we're doing, we might as well get going.  */
 302   if (bfd_seek (abfd, section->filepos + offset, SEEK_SET) != 0)
 303     return FALSE;
 304
 305   if (count != 0)
 306     return bfd_bwrite ((PTR) location, (bfd_size_type) count, abfd) == count;
 307
 308   return TRUE;
 309 }
 310 #endif  /* 0 */
 311
 312 static int
 313 os9k_sizeof_headers (ignore_abfd, ignore)
 314      bfd *ignore_abfd ATTRIBUTE_UNUSED;
 315      bfd_boolean ignore ATTRIBUTE_UNUSED;
 316 {
 317   return sizeof (struct internal_exec);
 318 }
 319
 320 \f
 321
 322 #define aout_32_close_and_cleanup aout_32_bfd_free_cached_info
 323
 324 #define aout_32_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
 325
 326 #define aout_32_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
 327
 328 #define aout_32_get_section_contents_in_window \
 329   _bfd_generic_get_section_contents_in_window
 330
 331 #define os9k_bfd_get_relocated_section_contents \
 332   bfd_generic_get_relocated_section_contents
 333 #define os9k_bfd_relax_section bfd_generic_relax_section
 334 #define os9k_bfd_gc_sections bfd_generic_gc_sections
 335 #define os9k_bfd_merge_sections bfd_generic_merge_sections
 336 #define os9k_bfd_discard_group bfd_generic_discard_group
 337 #define os9k_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
 338 #define os9k_bfd_link_hash_table_free _bfd_generic_link_hash_table_free
 339 #define os9k_bfd_link_add_symbols _bfd_generic_link_add_symbols
 340 #define os9k_bfd_link_just_syms _bfd_generic_link_just_syms
 341 #define os9k_bfd_final_link _bfd_generic_final_link
 342 #define os9k_bfd_link_split_section  _bfd_generic_link_split_section
 343
 344 const bfd_target i386os9k_vec =
 345   {
 346     "i386os9k",                 /* name */
 347     bfd_target_os9k_flavour,
 348     BFD_ENDIAN_LITTLE,          /* data byte order is little */
 349     BFD_ENDIAN_LITTLE,          /* hdr byte order is little */
 350     (HAS_RELOC | EXEC_P | WP_TEXT),     /* object flags */
 351     (SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD),  /* section flags */
 352     0,                          /* symbol leading char */
 353     ' ',                                /* ar_pad_char */
 354     16,                         /* ar_max_namelen */
 355
 356     bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 357     bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 358     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
 359     bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 360     bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 361     bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
 362     {_bfd_dummy_target, os9k_object_p,  /* bfd_check_format */
 363      bfd_generic_archive_p, _bfd_dummy_target},
 364     {bfd_false, bfd_false,      /* bfd_set_format */
 365      _bfd_generic_mkarchive, bfd_false},
 366     {bfd_false, bfd_false,      /* bfd_write_contents */
 367      _bfd_write_archive_contents, bfd_false},
 368
 369     BFD_JUMP_TABLE_GENERIC (aout_32),
 370     BFD_JUMP_TABLE_COPY (_bfd_generic),
 371     BFD_JUMP_TABLE_CORE (_bfd_nocore),
 372     BFD_JUMP_TABLE_ARCHIVE (_bfd_archive_bsd),
 373     BFD_JUMP_TABLE_SYMBOLS (aout_32),
 374     BFD_JUMP_TABLE_RELOCS (aout_32),
 375     BFD_JUMP_TABLE_WRITE (aout_32),
 376     BFD_JUMP_TABLE_LINK (os9k),
 377     BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 378
 379     NULL,
 380
 381     (PTR) 0,
 382   };