bfd/ppcboot.c

   1 /* BFD back-end for PPCbug boot records.
   2    Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2006,
   3    2007 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., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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 "sysdep.h"
  36 #include "safe-ctype.h"
  37 #include "bfd.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 bfd_boolean ppcboot_mkobject PARAMS ((bfd *));
  91 static const bfd_target *ppcboot_object_p PARAMS ((bfd *));
  92 static bfd_boolean ppcboot_set_arch_mach
  93   PARAMS ((bfd *, enum bfd_architecture, unsigned long));
  94 static bfd_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_canonicalize_symtab PARAMS ((bfd *, asymbol **));
  99 static void ppcboot_get_symbol_info PARAMS ((bfd *, asymbol *, symbol_info *));
 100 static bfd_boolean ppcboot_set_section_contents
 101   PARAMS ((bfd *, asection *, const PTR, file_ptr, bfd_size_type));
 102 static bfd_boolean ppcboot_bfd_print_private_bfd_data PARAMS ((bfd *, PTR));
 103
 104 #define ppcboot_set_tdata(abfd, ptr) ((abfd)->tdata.any = (PTR) (ptr))
 105 #define ppcboot_get_tdata(abfd) ((ppcboot_data_t *) ((abfd)->tdata.any))
 106 \f
 107 /* Create a ppcboot object.  Invoked via bfd_set_format.  */
 108
 109 static bfd_boolean
 110 ppcboot_mkobject (abfd)
 111      bfd *abfd;
 112 {
 113   if (!ppcboot_get_tdata (abfd))
 114     {
 115       bfd_size_type amt = sizeof (ppcboot_data_t);
 116       ppcboot_set_tdata (abfd, bfd_zalloc (abfd, amt));
 117     }
 118
 119   return TRUE;
 120 }
 121
 122 \f
 123 /* Set the architecture to PowerPC */
 124 static bfd_boolean
 125 ppcboot_set_arch_mach (abfd, arch, machine)
 126      bfd *abfd;
 127      enum bfd_architecture arch;
 128      unsigned long machine;
 129 {
 130   if (arch == bfd_arch_unknown)
 131     arch = bfd_arch_powerpc;
 132
 133   else if (arch != bfd_arch_powerpc)
 134     return FALSE;
 135
 136   return bfd_default_set_arch_mach (abfd, arch, machine);
 137 }
 138
 139 \f
 140 /* Any file may be considered to be a ppcboot file, provided the target
 141    was not defaulted.  That is, it must be explicitly specified as
 142    being ppcboot.  */
 143
 144 static const bfd_target *
 145 ppcboot_object_p (abfd)
 146      bfd *abfd;
 147 {
 148   struct stat statbuf;
 149   asection *sec;
 150   ppcboot_hdr_t hdr;
 151   size_t i;
 152   ppcboot_data_t *tdata;
 153   flagword flags;
 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   flags = SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_CODE | SEC_HAS_CONTENTS;
 209   sec = bfd_make_section_with_flags (abfd, ".data", flags);
 210   if (sec == NULL)
 211     return NULL;
 212   sec->vma = 0;
 213   sec->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 bfd_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_canonicalize_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->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->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_target_special_symbol \
 349   ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false)
 350 #define ppcboot_bfd_is_local_label_name bfd_generic_is_local_label_name
 351 #define ppcboot_get_lineno _bfd_nosymbols_get_lineno
 352 #define ppcboot_find_nearest_line _bfd_nosymbols_find_nearest_line
 353 #define ppcboot_find_inliner_info _bfd_nosymbols_find_inliner_info
 354 #define ppcboot_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
 355 #define ppcboot_read_minisymbols _bfd_generic_read_minisymbols
 356 #define ppcboot_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
 357 \f
 358 /* Write section contents of a ppcboot file.  */
 359
 360 static bfd_boolean
 361 ppcboot_set_section_contents (abfd, sec, data, offset, size)
 362      bfd *abfd;
 363      asection *sec;
 364      const PTR data;
 365      file_ptr offset;
 366      bfd_size_type size;
 367 {
 368   if (! abfd->output_has_begun)
 369     {
 370       bfd_vma low;
 371       asection *s;
 372
 373       /* The lowest section VMA sets the virtual address of the start
 374          of the file.  We use the set the file position of all the
 375          sections.  */
 376       low = abfd->sections->vma;
 377       for (s = abfd->sections->next; s != NULL; s = s->next)
 378         if (s->vma < low)
 379           low = s->vma;
 380
 381       for (s = abfd->sections; s != NULL; s = s->next)
 382         s->filepos = s->vma - low;
 383
 384       abfd->output_has_begun = TRUE;
 385     }
 386
 387   return _bfd_generic_set_section_contents (abfd, sec, data, offset, size);
 388 }
 389
 390 \f
 391 static int
 392 ppcboot_sizeof_headers (bfd *abfd ATTRIBUTE_UNUSED,
 393                         struct bfd_link_info *info ATTRIBUTE_UNUSED)
 394 {
 395   return sizeof (ppcboot_hdr_t);
 396 }
 397
 398 \f
 399 /* Print out the program headers.  */
 400
 401 static bfd_boolean
 402 ppcboot_bfd_print_private_bfd_data (abfd, farg)
 403      bfd *abfd;
 404      PTR farg;
 405 {
 406   FILE *f = (FILE *)farg;
 407   ppcboot_data_t *tdata = ppcboot_get_tdata (abfd);
 408   long entry_offset = bfd_getl_signed_32 ((PTR) tdata->header.entry_offset);
 409   long length = bfd_getl_signed_32 ((PTR) tdata->header.length);
 410   int i;
 411
 412   fprintf (f, _("\nppcboot header:\n"));
 413   fprintf (f, _("Entry offset        = 0x%.8lx (%ld)\n"), entry_offset, entry_offset);
 414   fprintf (f, _("Length              = 0x%.8lx (%ld)\n"), length, length);
 415
 416   if (tdata->header.flags)
 417     fprintf (f, _("Flag field          = 0x%.2x\n"), tdata->header.flags);
 418
 419   if (tdata->header.os_id)
 420     fprintf (f, "OS_ID               = 0x%.2x\n", tdata->header.os_id);
 421
 422   if (tdata->header.partition_name)
 423     fprintf (f, _("Partition name      = \"%s\"\n"), tdata->header.partition_name);
 424
 425   for (i = 0; i < 4; i++)
 426     {
 427       long sector_begin  = bfd_getl_signed_32 ((PTR) tdata->header.partition[i].sector_begin);
 428       long sector_length = bfd_getl_signed_32 ((PTR) tdata->header.partition[i].sector_length);
 429
 430       /* Skip all 0 entries */
 431       if (!tdata->header.partition[i].partition_begin.ind
 432           && !tdata->header.partition[i].partition_begin.head
 433           && !tdata->header.partition[i].partition_begin.sector
 434           && !tdata->header.partition[i].partition_begin.cylinder
 435           && !tdata->header.partition[i].partition_end.ind
 436           && !tdata->header.partition[i].partition_end.head
 437           && !tdata->header.partition[i].partition_end.sector
 438           && !tdata->header.partition[i].partition_end.cylinder
 439           && !sector_begin && !sector_length)
 440         continue;
 441
 442       fprintf (f, _("\nPartition[%d] start  = { 0x%.2x, 0x%.2x, 0x%.2x, 0x%.2x }\n"), i,
 443                tdata->header.partition[i].partition_begin.ind,
 444                tdata->header.partition[i].partition_begin.head,
 445                tdata->header.partition[i].partition_begin.sector,
 446                tdata->header.partition[i].partition_begin.cylinder);
 447
 448       fprintf (f, _("Partition[%d] end    = { 0x%.2x, 0x%.2x, 0x%.2x, 0x%.2x }\n"), i,
 449                tdata->header.partition[i].partition_end.ind,
 450                tdata->header.partition[i].partition_end.head,
 451                tdata->header.partition[i].partition_end.sector,
 452                tdata->header.partition[i].partition_end.cylinder);
 453
 454       fprintf (f, _("Partition[%d] sector = 0x%.8lx (%ld)\n"), i, sector_begin, sector_begin);
 455       fprintf (f, _("Partition[%d] length = 0x%.8lx (%ld)\n"), i, sector_length, sector_length);
 456     }
 457
 458   fprintf (f, "\n");
 459   return TRUE;
 460 }
 461
 462 \f
 463 #define ppcboot_bfd_get_relocated_section_contents \
 464   bfd_generic_get_relocated_section_contents
 465 #define ppcboot_bfd_relax_section bfd_generic_relax_section
 466 #define ppcboot_bfd_gc_sections bfd_generic_gc_sections
 467 #define ppcboot_bfd_merge_sections bfd_generic_merge_sections
 468 #define ppcboot_bfd_is_group_section bfd_generic_is_group_section
 469 #define ppcboot_bfd_discard_group bfd_generic_discard_group
 470 #define ppcboot_section_already_linked \
 471   _bfd_generic_section_already_linked
 472 #define ppcboot_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
 473 #define ppcboot_bfd_link_hash_table_free _bfd_generic_link_hash_table_free
 474 #define ppcboot_bfd_link_add_symbols _bfd_generic_link_add_symbols
 475 #define ppcboot_bfd_link_just_syms _bfd_generic_link_just_syms
 476 #define ppcboot_bfd_final_link _bfd_generic_final_link
 477 #define ppcboot_bfd_link_split_section _bfd_generic_link_split_section
 478 #define ppcboot_get_section_contents_in_window \
 479   _bfd_generic_get_section_contents_in_window
 480
 481 #define ppcboot_bfd_copy_private_bfd_data _bfd_generic_bfd_copy_private_bfd_data
 482 #define ppcboot_bfd_merge_private_bfd_data _bfd_generic_bfd_merge_private_bfd_data
 483 #define ppcboot_bfd_copy_private_section_data _bfd_generic_bfd_copy_private_section_data
 484 #define ppcboot_bfd_copy_private_symbol_data _bfd_generic_bfd_copy_private_symbol_data
 485 #define ppcboot_bfd_copy_private_header_data _bfd_generic_bfd_copy_private_header_data
 486 #define ppcboot_bfd_set_private_flags _bfd_generic_bfd_set_private_flags
 487 #define ppcboot_bfd_print_private_bfd_dat ppcboot_bfd_print_private_bfd_data
 488
 489 const bfd_target ppcboot_vec =
 490 {
 491   "ppcboot",                    /* name */
 492   bfd_target_unknown_flavour,   /* flavour */
 493   BFD_ENDIAN_BIG,               /* byteorder is big endian for code */
 494   BFD_ENDIAN_LITTLE,            /* header_byteorder */
 495   EXEC_P,                       /* object_flags */
 496   (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | SEC_DATA
 497    | SEC_ROM | SEC_HAS_CONTENTS), /* section_flags */
 498   0,                            /* symbol_leading_char */
 499   ' ',                          /* ar_pad_char */
 500   16,                           /* ar_max_namelen */
 501   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 502   bfd_getb32, bfd_getb_signed_32, bfd_putb32,
 503   bfd_getb16, bfd_getb_signed_16, bfd_putb16,   /* data */
 504   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 505   bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 506   bfd_getl16, bfd_getl_signed_16, bfd_putl16,   /* hdrs */
 507   {                             /* bfd_check_format */
 508     _bfd_dummy_target,
 509     ppcboot_object_p,           /* bfd_check_format */
 510     _bfd_dummy_target,
 511     _bfd_dummy_target,
 512   },
 513   {                             /* bfd_set_format */
 514     bfd_false,
 515     ppcboot_mkobject,
 516     bfd_false,
 517     bfd_false,
 518   },
 519   {                             /* bfd_write_contents */
 520     bfd_false,
 521     bfd_true,
 522     bfd_false,
 523     bfd_false,
 524   },
 525
 526   BFD_JUMP_TABLE_GENERIC (ppcboot),
 527   BFD_JUMP_TABLE_COPY (ppcboot),
 528   BFD_JUMP_TABLE_CORE (_bfd_nocore),
 529   BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 530   BFD_JUMP_TABLE_SYMBOLS (ppcboot),
 531   BFD_JUMP_TABLE_RELOCS (_bfd_norelocs),
 532   BFD_JUMP_TABLE_WRITE (ppcboot),
 533   BFD_JUMP_TABLE_LINK (ppcboot),
 534   BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 535
 536   NULL,
 537
 538   NULL
 539 };