bfd/ppcboot.c

   1 /* BFD back-end for PPCbug boot records.
   2    Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002
   3    Free Software Foundation, Inc.
   4    Written by Michael Meissner, Cygnus Support, <meissner@cygnus.com>
   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 /* This is a BFD backend which may be used to write PowerPCBug boot objects.
  23    It may only be used for output, not input.  The intention is that this may
  24    be used as an output format for objcopy in order to generate raw binary
  25    data.
  26
  27    This is very simple.  The only complication is that the real data
  28    will start at some address X, and in some cases we will not want to
  29    include X zeroes just to get to that point.  Since the start
  30    address is not meaningful for this object file format, we use it
  31    instead to indicate the number of zeroes to skip at the start of
  32    the file.  objcopy cooperates by specially setting the start
  33    address to zero by default.  */
  34
  35 #include "safe-ctype.h"
  36 #include "bfd.h"
  37 #include "sysdep.h"
  38 #include "libbfd.h"
  39
  40 /* PPCbug location structure */
  41 typedef struct ppcboot_location {
  42   bfd_byte      ind;
  43   bfd_byte      head;
  44   bfd_byte      sector;
  45   bfd_byte      cylinder;
  46 } ppcboot_location_t;
  47
  48 /* PPCbug partition table layout */
  49 typedef struct ppcboot_partition {
  50   ppcboot_location_t    partition_begin;        /* partition begin */
  51   ppcboot_location_t    partition_end;          /* partition end */
  52   bfd_byte              sector_begin[4];        /* 32-bit start RBA (zero-based), little endian */
  53   bfd_byte              sector_length[4];       /* 32-bit RBA count (one-based), little endian */
  54 } ppcboot_partition_t;
  55
  56 /* PPCbug boot layout.  */
  57 typedef struct ppcboot_hdr {
  58   bfd_byte              pc_compatibility[446];  /* x86 instruction field */
  59   ppcboot_partition_t   partition[4];           /* partition information */
  60   bfd_byte              signature[2];           /* 0x55 and 0xaa */
  61   bfd_byte              entry_offset[4];        /* entry point offset, little endian */
  62   bfd_byte              length[4];              /* load image length, little endian */
  63   bfd_byte              flags;                  /* flag field */
  64   bfd_byte              os_id;                  /* OS_ID */
  65   char                  partition_name[32];     /* partition name */
  66   bfd_byte              reserved1[470];         /* reserved */
  67 }
  68 #ifdef __GNUC__
  69   __attribute__ ((packed))
  70 #endif
  71 ppcboot_hdr_t;
  72
  73 /* Signature bytes for last 2 bytes of the 512 byte record */
  74 #define SIGNATURE0 0x55
  75 #define SIGNATURE1 0xaa
  76
  77 /* PowerPC boot type */
  78 #define PPC_IND 0x41
  79
  80 /* Information needed for ppcboot header */
  81 typedef struct ppcboot_data {
  82   ppcboot_hdr_t header;                         /* raw header */
  83   asection *sec;                                /* single section */
  84 } ppcboot_data_t;
  85
  86 /* Any bfd we create by reading a ppcboot file has three symbols:
  87    a start symbol, an end symbol, and an absolute length symbol.  */
  88 #define PPCBOOT_SYMS 3
  89
  90 static boolean ppcboot_mkobject PARAMS ((bfd *));
  91 static const bfd_target *ppcboot_object_p PARAMS ((bfd *));
  92 static boolean ppcboot_set_arch_mach
  93   PARAMS ((bfd *, enum bfd_architecture, unsigned long));
  94 static boolean ppcboot_get_section_contents
  95   PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type));
  96 static long ppcboot_get_symtab_upper_bound PARAMS ((bfd *));
  97 static char *mangle_name PARAMS ((bfd *, char *));
  98 static long ppcboot_get_symtab PARAMS ((bfd *, asymbol **));
  99 static void ppcboot_get_symbol_info PARAMS ((bfd *, asymbol *, symbol_info *));
 100 static boolean ppcboot_set_section_contents
 101   PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type));
 102 static int ppcboot_sizeof_headers PARAMS ((bfd *, boolean));
 103 static boolean ppcboot_bfd_print_private_bfd_data PARAMS ((bfd *, PTR));
 104
 105 #define ppcboot_set_tdata(abfd, ptr) ((abfd)->tdata.any = (PTR) (ptr))
 106 #define ppcboot_get_tdata(abfd) ((ppcboot_data_t *) ((abfd)->tdata.any))
 107 \f
 108 /* Create a ppcboot object.  Invoked via bfd_set_format.  */
 109
 110 static boolean
 111 ppcboot_mkobject (abfd)
 112      bfd *abfd;
 113 {
 114   if (!ppcboot_get_tdata (abfd))
 115     {
 116       bfd_size_type amt = sizeof (ppcboot_data_t);
 117       ppcboot_set_tdata (abfd, bfd_zalloc (abfd, amt));
 118     }
 119
 120   return true;
 121 }
 122
 123 \f
 124 /* Set the architecture to PowerPC */
 125 static boolean
 126 ppcboot_set_arch_mach (abfd, arch, machine)
 127      bfd *abfd;
 128      enum bfd_architecture arch;
 129      unsigned long machine;
 130 {
 131   if (arch == bfd_arch_unknown)
 132     arch = bfd_arch_powerpc;
 133
 134   else if (arch != bfd_arch_powerpc)
 135     return false;
 136
 137   return bfd_default_set_arch_mach (abfd, arch, machine);
 138 }
 139
 140 \f
 141 /* Any file may be considered to be a ppcboot file, provided the target
 142    was not defaulted.  That is, it must be explicitly specified as
 143    being ppcboot.  */
 144
 145 static const bfd_target *
 146 ppcboot_object_p (abfd)
 147      bfd *abfd;
 148 {
 149   struct stat statbuf;
 150   asection *sec;
 151   ppcboot_hdr_t hdr;
 152   size_t i;
 153   ppcboot_data_t *tdata;
 154
 155   BFD_ASSERT (sizeof (ppcboot_hdr_t) == 1024);
 156
 157   if (abfd->target_defaulted)
 158     {
 159       bfd_set_error (bfd_error_wrong_format);
 160       return NULL;
 161     }
 162
 163   /* Find the file size.  */
 164   if (bfd_stat (abfd, &statbuf) < 0)
 165     {
 166       bfd_set_error (bfd_error_system_call);
 167       return NULL;
 168     }
 169
 170   if ((size_t) statbuf.st_size < sizeof (ppcboot_hdr_t))
 171     {
 172       bfd_set_error (bfd_error_wrong_format);
 173       return NULL;
 174     }
 175
 176   if (bfd_bread ((PTR) &hdr, (bfd_size_type) sizeof (hdr), abfd)
 177       != sizeof (hdr))
 178     {
 179       if (bfd_get_error () != bfd_error_system_call)
 180         bfd_set_error (bfd_error_wrong_format);
 181
 182       return NULL;
 183     }
 184
 185   /* Now do some basic checks.  */
 186   for (i = 0; i < sizeof (hdr.pc_compatibility); i++)
 187     if (hdr.pc_compatibility[i])
 188       {
 189         bfd_set_error (bfd_error_wrong_format);
 190         return NULL;
 191       }
 192
 193   if (hdr.signature[0] != SIGNATURE0 || hdr.signature[1] != SIGNATURE1)
 194     {
 195       bfd_set_error (bfd_error_wrong_format);
 196       return NULL;
 197     }
 198
 199   if (hdr.partition[0].partition_end.ind != PPC_IND)
 200     {
 201       bfd_set_error (bfd_error_wrong_format);
 202       return NULL;
 203     }
 204
 205   abfd->symcount = PPCBOOT_SYMS;
 206
 207   /* One data section.  */
 208   sec = bfd_make_section (abfd, ".data");
 209   if (sec == NULL)
 210     return NULL;
 211   sec->flags = SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_CODE | SEC_HAS_CONTENTS;
 212   sec->vma = 0;
 213   sec->_raw_size = statbuf.st_size - sizeof (ppcboot_hdr_t);
 214   sec->filepos = sizeof (ppcboot_hdr_t);
 215
 216   ppcboot_mkobject (abfd);
 217   tdata = ppcboot_get_tdata (abfd);
 218   tdata->sec = sec;
 219   memcpy ((PTR) &tdata->header, (PTR) &hdr, sizeof (ppcboot_hdr_t));
 220
 221   ppcboot_set_arch_mach (abfd, bfd_arch_powerpc, 0L);
 222   return abfd->xvec;
 223 }
 224
 225 #define ppcboot_close_and_cleanup _bfd_generic_close_and_cleanup
 226 #define ppcboot_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
 227 #define ppcboot_new_section_hook _bfd_generic_new_section_hook
 228
 229 \f
 230 /* Get contents of the only section.  */
 231
 232 static boolean
 233 ppcboot_get_section_contents (abfd, section, location, offset, count)
 234      bfd *abfd;
 235      asection *section ATTRIBUTE_UNUSED;
 236      PTR location;
 237      file_ptr offset;
 238      bfd_size_type count;
 239 {
 240   if (bfd_seek (abfd, offset + (file_ptr) sizeof (ppcboot_hdr_t), SEEK_SET) != 0
 241       || bfd_bread (location, count, abfd) != count)
 242     return false;
 243   return true;
 244 }
 245
 246 \f
 247 /* Return the amount of memory needed to read the symbol table.  */
 248
 249 static long
 250 ppcboot_get_symtab_upper_bound (abfd)
 251      bfd *abfd ATTRIBUTE_UNUSED;
 252 {
 253   return (PPCBOOT_SYMS + 1) * sizeof (asymbol *);
 254 }
 255
 256 \f
 257 /* Create a symbol name based on the bfd's filename.  */
 258
 259 static char *
 260 mangle_name (abfd, suffix)
 261      bfd *abfd;
 262      char *suffix;
 263 {
 264   bfd_size_type size;
 265   char *buf;
 266   char *p;
 267
 268   size = (strlen (bfd_get_filename (abfd))
 269           + strlen (suffix)
 270           + sizeof "_ppcboot__");
 271
 272   buf = (char *) bfd_alloc (abfd, size);
 273   if (buf == NULL)
 274     return "";
 275
 276   sprintf (buf, "_ppcboot_%s_%s", bfd_get_filename (abfd), suffix);
 277
 278   /* Change any non-alphanumeric characters to underscores.  */
 279   for (p = buf; *p; p++)
 280     if (! ISALNUM (*p))
 281       *p = '_';
 282
 283   return buf;
 284 }
 285
 286 \f
 287 /* Return the symbol table.  */
 288
 289 static long
 290 ppcboot_get_symtab (abfd, alocation)
 291      bfd *abfd;
 292      asymbol **alocation;
 293 {
 294   asection *sec = ppcboot_get_tdata (abfd)->sec;
 295   asymbol *syms;
 296   unsigned int i;
 297   bfd_size_type amt = PPCBOOT_SYMS * sizeof (asymbol);
 298
 299   syms = (asymbol *) bfd_alloc (abfd, amt);
 300   if (syms == NULL)
 301     return false;
 302
 303   /* Start symbol.  */
 304   syms[0].the_bfd = abfd;
 305   syms[0].name = mangle_name (abfd, "start");
 306   syms[0].value = 0;
 307   syms[0].flags = BSF_GLOBAL;
 308   syms[0].section = sec;
 309   syms[0].udata.p = NULL;
 310
 311   /* End symbol.  */
 312   syms[1].the_bfd = abfd;
 313   syms[1].name = mangle_name (abfd, "end");
 314   syms[1].value = sec->_raw_size;
 315   syms[1].flags = BSF_GLOBAL;
 316   syms[1].section = sec;
 317   syms[1].udata.p = NULL;
 318
 319   /* Size symbol.  */
 320   syms[2].the_bfd = abfd;
 321   syms[2].name = mangle_name (abfd, "size");
 322   syms[2].value = sec->_raw_size;
 323   syms[2].flags = BSF_GLOBAL;
 324   syms[2].section = bfd_abs_section_ptr;
 325   syms[2].udata.p = NULL;
 326
 327   for (i = 0; i < PPCBOOT_SYMS; i++)
 328     *alocation++ = syms++;
 329   *alocation = NULL;
 330
 331   return PPCBOOT_SYMS;
 332 }
 333
 334 #define ppcboot_make_empty_symbol _bfd_generic_make_empty_symbol
 335 #define ppcboot_print_symbol _bfd_nosymbols_print_symbol
 336
 337 /* Get information about a symbol.  */
 338
 339 static void
 340 ppcboot_get_symbol_info (ignore_abfd, symbol, ret)
 341      bfd *ignore_abfd ATTRIBUTE_UNUSED;
 342      asymbol *symbol;
 343      symbol_info *ret;
 344 {
 345   bfd_symbol_info (symbol, ret);
 346 }
 347
 348 #define ppcboot_bfd_is_local_label_name bfd_generic_is_local_label_name
 349 #define ppcboot_get_lineno _bfd_nosymbols_get_lineno
 350 #define ppcboot_find_nearest_line _bfd_nosymbols_find_nearest_line
 351 #define ppcboot_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
 352 #define ppcboot_read_minisymbols _bfd_generic_read_minisymbols
 353 #define ppcboot_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
 354
 355 #define ppcboot_get_reloc_upper_bound \
 356   ((long (*) PARAMS ((bfd *, asection *))) bfd_0l)
 357 #define ppcboot_canonicalize_reloc \
 358   ((long (*) PARAMS ((bfd *, asection *, arelent **, asymbol **))) bfd_0l)
 359 #define ppcboot_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
 360 \f
 361 /* Write section contents of a ppcboot file.  */
 362
 363 static boolean
 364 ppcboot_set_section_contents (abfd, sec, data, offset, size)
 365      bfd *abfd;
 366      asection *sec;
 367      PTR data;
 368      file_ptr offset;
 369      bfd_size_type size;
 370 {
 371   if (! abfd->output_has_begun)
 372     {
 373       bfd_vma low;
 374       asection *s;
 375
 376       /* The lowest section VMA sets the virtual address of the start
 377          of the file.  We use the set the file position of all the
 378          sections.  */
 379       low = abfd->sections->vma;
 380       for (s = abfd->sections->next; s != NULL; s = s->next)
 381         if (s->vma < low)
 382           low = s->vma;
 383
 384       for (s = abfd->sections; s != NULL; s = s->next)
 385         s->filepos = s->vma - low;
 386
 387       abfd->output_has_begun = true;
 388     }
 389
 390   return _bfd_generic_set_section_contents (abfd, sec, data, offset, size);
 391 }
 392
 393 \f
 394 static int
 395 ppcboot_sizeof_headers (abfd, exec)
 396      bfd *abfd ATTRIBUTE_UNUSED;
 397      boolean exec ATTRIBUTE_UNUSED;
 398 {
 399   return sizeof (ppcboot_hdr_t);
 400 }
 401
 402 \f
 403 /* Print out the program headers.  */
 404
 405 static boolean
 406 ppcboot_bfd_print_private_bfd_data (abfd, farg)
 407      bfd *abfd;
 408      PTR farg;
 409 {
 410   FILE *f = (FILE *)farg;
 411   ppcboot_data_t *tdata = ppcboot_get_tdata (abfd);
 412   long entry_offset = bfd_getl_signed_32 ((PTR) tdata->header.entry_offset);
 413   long length = bfd_getl_signed_32 ((PTR) tdata->header.length);
 414   int i;
 415
 416   fprintf (f, _("\nppcboot header:\n"));
 417   fprintf (f, _("Entry offset        = 0x%.8lx (%ld)\n"), entry_offset, entry_offset);
 418   fprintf (f, _("Length              = 0x%.8lx (%ld)\n"), length, length);
 419
 420   if (tdata->header.flags)
 421     fprintf (f, _("Flag field          = 0x%.2x\n"), tdata->header.flags);
 422
 423   if (tdata->header.os_id)
 424     fprintf (f, "OS_ID               = 0x%.2x\n", tdata->header.os_id);
 425
 426   if (tdata->header.partition_name)
 427     fprintf (f, _("Partition name      = \"%s\"\n"), tdata->header.partition_name);
 428
 429   for (i = 0; i < 4; i++)
 430     {
 431       long sector_begin  = bfd_getl_signed_32 ((PTR) tdata->header.partition[i].sector_begin);
 432       long sector_length = bfd_getl_signed_32 ((PTR) tdata->header.partition[i].sector_length);
 433
 434       /* Skip all 0 entries */
 435       if (!tdata->header.partition[i].partition_begin.ind
 436           && !tdata->header.partition[i].partition_begin.head
 437           && !tdata->header.partition[i].partition_begin.sector
 438           && !tdata->header.partition[i].partition_begin.cylinder
 439           && !tdata->header.partition[i].partition_end.ind
 440           && !tdata->header.partition[i].partition_end.head
 441           && !tdata->header.partition[i].partition_end.sector
 442           && !tdata->header.partition[i].partition_end.cylinder
 443           && !sector_begin && !sector_length)
 444         continue;
 445
 446       fprintf (f, _("\nPartition[%d] start  = { 0x%.2x, 0x%.2x, 0x%.2x, 0x%.2x }\n"), i,
 447                tdata->header.partition[i].partition_begin.ind,
 448                tdata->header.partition[i].partition_begin.head,
 449                tdata->header.partition[i].partition_begin.sector,
 450                tdata->header.partition[i].partition_begin.cylinder);
 451
 452       fprintf (f, _("Partition[%d] end    = { 0x%.2x, 0x%.2x, 0x%.2x, 0x%.2x }\n"), i,
 453                tdata->header.partition[i].partition_end.ind,
 454                tdata->header.partition[i].partition_end.head,
 455                tdata->header.partition[i].partition_end.sector,
 456                tdata->header.partition[i].partition_end.cylinder);
 457
 458       fprintf (f, _("Partition[%d] sector = 0x%.8lx (%ld)\n"), i, sector_begin, sector_begin);
 459       fprintf (f, _("Partition[%d] length = 0x%.8lx (%ld)\n"), i, sector_length, sector_length);
 460     }
 461
 462   fprintf (f, "\n");
 463   return true;
 464 }
 465
 466 \f
 467 #define ppcboot_bfd_get_relocated_section_contents \
 468   bfd_generic_get_relocated_section_contents
 469 #define ppcboot_bfd_relax_section bfd_generic_relax_section
 470 #define ppcboot_bfd_gc_sections bfd_generic_gc_sections
 471 #define ppcboot_bfd_merge_sections bfd_generic_merge_sections
 472 #define ppcboot_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
 473 #define ppcboot_bfd_link_add_symbols _bfd_generic_link_add_symbols
 474 #define ppcboot_bfd_final_link _bfd_generic_final_link
 475 #define ppcboot_bfd_link_split_section _bfd_generic_link_split_section
 476 #define ppcboot_get_section_contents_in_window \
 477   _bfd_generic_get_section_contents_in_window
 478
 479 #define ppcboot_bfd_copy_private_bfd_data _bfd_generic_bfd_copy_private_bfd_data
 480 #define ppcboot_bfd_merge_private_bfd_data _bfd_generic_bfd_merge_private_bfd_data
 481 #define ppcboot_bfd_copy_private_section_data _bfd_generic_bfd_copy_private_section_data
 482 #define ppcboot_bfd_copy_private_symbol_data _bfd_generic_bfd_copy_private_symbol_data
 483 #define ppcboot_bfd_set_private_flags _bfd_generic_bfd_set_private_flags
 484 #define ppcboot_bfd_print_private_bfd_dat ppcboot_bfd_print_private_bfd_data
 485
 486 const bfd_target ppcboot_vec =
 487 {
 488   "ppcboot",                    /* name */
 489   bfd_target_unknown_flavour,   /* flavour */
 490   BFD_ENDIAN_BIG,               /* byteorder is big endian for code */
 491   BFD_ENDIAN_LITTLE,            /* header_byteorder */
 492   EXEC_P,                       /* object_flags */
 493   (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | SEC_DATA
 494    | SEC_ROM | SEC_HAS_CONTENTS), /* section_flags */
 495   0,                            /* symbol_leading_char */
 496   ' ',                          /* ar_pad_char */
 497   16,                           /* ar_max_namelen */
 498   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 499   bfd_getb32, bfd_getb_signed_32, bfd_putb32,
 500   bfd_getb16, bfd_getb_signed_16, bfd_putb16,   /* data */
 501   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 502   bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 503   bfd_getl16, bfd_getl_signed_16, bfd_putl16,   /* hdrs */
 504   {                             /* bfd_check_format */
 505     _bfd_dummy_target,
 506     ppcboot_object_p,           /* bfd_check_format */
 507     _bfd_dummy_target,
 508     _bfd_dummy_target,
 509   },
 510   {                             /* bfd_set_format */
 511     bfd_false,
 512     ppcboot_mkobject,
 513     bfd_false,
 514     bfd_false,
 515   },
 516   {                             /* bfd_write_contents */
 517     bfd_false,
 518     bfd_true,
 519     bfd_false,
 520     bfd_false,
 521   },
 522
 523   BFD_JUMP_TABLE_GENERIC (ppcboot),
 524   BFD_JUMP_TABLE_COPY (ppcboot),
 525   BFD_JUMP_TABLE_CORE (_bfd_nocore),
 526   BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 527   BFD_JUMP_TABLE_SYMBOLS (ppcboot),
 528   BFD_JUMP_TABLE_RELOCS (ppcboot),
 529   BFD_JUMP_TABLE_WRITE (ppcboot),
 530   BFD_JUMP_TABLE_LINK (ppcboot),
 531   BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 532
 533   NULL,
 534
 535   NULL
 536 };