bfd/ppcboot.c

   1 /* BFD back-end for PPCbug boot records.
   2    Copyright 1996, 1997, 1998, 1999, 2000, 2001
   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 <ctype.h>
  36
  37 #include "bfd.h"
  38 #include "sysdep.h"
  39 #include "libbfd.h"
  40
  41 /* PPCbug location structure */
  42 typedef struct ppcboot_location {
  43   bfd_byte      ind;
  44   bfd_byte      head;
  45   bfd_byte      sector;
  46   bfd_byte      cylinder;
  47 } ppcboot_location_t;
  48
  49 /* PPCbug partition table layout */
  50 typedef struct ppcboot_partition {
  51   ppcboot_location_t    partition_begin;        /* partition begin */
  52   ppcboot_location_t    partition_end;          /* partition end */
  53   bfd_byte              sector_begin[4];        /* 32-bit start RBA (zero-based), little endian */
  54   bfd_byte              sector_length[4];       /* 32-bit RBA count (one-based), little endian */
  55 } ppcboot_partition_t;
  56
  57 /* PPCbug boot layout.  */
  58 typedef struct ppcboot_hdr {
  59   bfd_byte              pc_compatibility[446];  /* x86 instruction field */
  60   ppcboot_partition_t   partition[4];           /* partition information */
  61   bfd_byte              signature[2];           /* 0x55 and 0xaa */
  62   bfd_byte              entry_offset[4];        /* entry point offset, little endian */
  63   bfd_byte              length[4];              /* load image length, little endian */
  64   bfd_byte              flags;                  /* flag field */
  65   bfd_byte              os_id;                  /* OS_ID */
  66   char                  partition_name[32];     /* partition name */
  67   bfd_byte              reserved1[470];         /* reserved */
  68 }
  69 #ifdef __GNUC__
  70   __attribute__ ((packed))
  71 #endif
  72 ppcboot_hdr_t;
  73
  74 /* Signature bytes for last 2 bytes of the 512 byte record */
  75 #define SIGNATURE0 0x55
  76 #define SIGNATURE1 0xaa
  77
  78 /* PowerPC boot type */
  79 #define PPC_IND 0x41
  80
  81 /* Information needed for ppcboot header */
  82 typedef struct ppcboot_data {
  83   ppcboot_hdr_t header;                         /* raw header */
  84   asection *sec;                                /* single section */
  85 } ppcboot_data_t;
  86
  87 /* Any bfd we create by reading a ppcboot file has three symbols:
  88    a start symbol, an end symbol, and an absolute length symbol.  */
  89 #define PPCBOOT_SYMS 3
  90
  91 static boolean ppcboot_mkobject PARAMS ((bfd *));
  92 static const bfd_target *ppcboot_object_p PARAMS ((bfd *));
  93 static boolean ppcboot_set_arch_mach
  94   PARAMS ((bfd *, enum bfd_architecture, unsigned long));
  95 static boolean ppcboot_get_section_contents
  96   PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type));
  97 static long ppcboot_get_symtab_upper_bound PARAMS ((bfd *));
  98 static char *mangle_name PARAMS ((bfd *, char *));
  99 static long ppcboot_get_symtab PARAMS ((bfd *, asymbol **));
 100 static asymbol *ppcboot_make_empty_symbol PARAMS ((bfd *));
 101 static void ppcboot_get_symbol_info PARAMS ((bfd *, asymbol *, symbol_info *));
 102 static boolean ppcboot_set_section_contents
 103   PARAMS ((bfd *, asection *, PTR, file_ptr, bfd_size_type));
 104 static int ppcboot_sizeof_headers PARAMS ((bfd *, boolean));
 105 static boolean ppcboot_bfd_print_private_bfd_data PARAMS ((bfd *, PTR));
 106
 107 #define ppcboot_set_tdata(abfd, ptr) ((abfd)->tdata.any = (PTR) (ptr))
 108 #define ppcboot_get_tdata(abfd) ((ppcboot_data_t *) ((abfd)->tdata.any))
 109 \f
 110 /* Create a ppcboot object.  Invoked via bfd_set_format.  */
 111
 112 static boolean
 113 ppcboot_mkobject (abfd)
 114      bfd *abfd;
 115 {
 116   if (!ppcboot_get_tdata (abfd))
 117     ppcboot_set_tdata (abfd, bfd_zalloc (abfd, sizeof (ppcboot_data_t)));
 118
 119   return true;
 120 }
 121
 122 \f
 123 /* Set the architecture to PowerPC */
 124 static 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
 154   BFD_ASSERT (sizeof (ppcboot_hdr_t) == 1024);
 155
 156   if (abfd->target_defaulted)
 157     {
 158       bfd_set_error (bfd_error_wrong_format);
 159       return NULL;
 160     }
 161
 162   /* Find the file size.  */
 163   if (bfd_stat (abfd, &statbuf) < 0)
 164     {
 165       bfd_set_error (bfd_error_system_call);
 166       return NULL;
 167     }
 168
 169   if ((size_t) statbuf.st_size < sizeof (ppcboot_hdr_t))
 170     {
 171       bfd_set_error (bfd_error_wrong_format);
 172       return NULL;
 173     }
 174
 175   if (bfd_read ((PTR) &hdr, sizeof (hdr), 1, abfd) != sizeof (hdr))
 176     {
 177       if (bfd_get_error () != bfd_error_system_call)
 178         bfd_set_error (bfd_error_wrong_format);
 179
 180       return NULL;
 181     }
 182
 183   /* Now do some basic checks.  */
 184   for (i = 0; i < sizeof (hdr.pc_compatibility); i++)
 185     if (hdr.pc_compatibility[i])
 186       {
 187         bfd_set_error (bfd_error_wrong_format);
 188         return NULL;
 189       }
 190
 191   if (hdr.signature[0] != SIGNATURE0 || hdr.signature[1] != SIGNATURE1)
 192     {
 193       bfd_set_error (bfd_error_wrong_format);
 194       return NULL;
 195     }
 196
 197   if (hdr.partition[0].partition_end.ind != PPC_IND)
 198     {
 199       bfd_set_error (bfd_error_wrong_format);
 200       return NULL;
 201     }
 202
 203   abfd->symcount = PPCBOOT_SYMS;
 204
 205   /* One data section.  */
 206   sec = bfd_make_section (abfd, ".data");
 207   if (sec == NULL)
 208     return NULL;
 209   sec->flags = SEC_ALLOC | SEC_LOAD | SEC_DATA | SEC_CODE | SEC_HAS_CONTENTS;
 210   sec->vma = 0;
 211   sec->_raw_size = statbuf.st_size - sizeof (ppcboot_hdr_t);
 212   sec->filepos = sizeof (ppcboot_hdr_t);
 213
 214   ppcboot_mkobject (abfd);
 215   tdata = ppcboot_get_tdata (abfd);
 216   tdata->sec = sec;
 217   memcpy ((PTR) &tdata->header, (PTR) &hdr, sizeof (ppcboot_hdr_t));
 218
 219   ppcboot_set_arch_mach (abfd, bfd_arch_powerpc, 0);
 220   return abfd->xvec;
 221 }
 222
 223 #define ppcboot_close_and_cleanup _bfd_generic_close_and_cleanup
 224 #define ppcboot_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
 225 #define ppcboot_new_section_hook _bfd_generic_new_section_hook
 226
 227 \f
 228 /* Get contents of the only section.  */
 229
 230 static boolean
 231 ppcboot_get_section_contents (abfd, section, location, offset, count)
 232      bfd *abfd;
 233      asection *section ATTRIBUTE_UNUSED;
 234      PTR location;
 235      file_ptr offset;
 236      bfd_size_type count;
 237 {
 238   if (bfd_seek (abfd, offset + sizeof (ppcboot_hdr_t), SEEK_SET) != 0
 239       || bfd_read (location, 1, count, abfd) != count)
 240     return false;
 241   return true;
 242 }
 243
 244 \f
 245 /* Return the amount of memory needed to read the symbol table.  */
 246
 247 static long
 248 ppcboot_get_symtab_upper_bound (abfd)
 249      bfd *abfd ATTRIBUTE_UNUSED;
 250 {
 251   return (PPCBOOT_SYMS + 1) * sizeof (asymbol *);
 252 }
 253
 254 \f
 255 /* Create a symbol name based on the bfd's filename.  */
 256
 257 static char *
 258 mangle_name (abfd, suffix)
 259      bfd *abfd;
 260      char *suffix;
 261 {
 262   int size;
 263   char *buf;
 264   char *p;
 265
 266   size = (strlen (bfd_get_filename (abfd))
 267           + strlen (suffix)
 268           + sizeof "_ppcboot__");
 269
 270   buf = (char *) bfd_alloc (abfd, size);
 271   if (buf == NULL)
 272     return "";
 273
 274   sprintf (buf, "_ppcboot_%s_%s", bfd_get_filename (abfd), suffix);
 275
 276   /* Change any non-alphanumeric characters to underscores.  */
 277   for (p = buf; *p; p++)
 278     if (! isalnum ((unsigned char) *p))
 279       *p = '_';
 280
 281   return buf;
 282 }
 283
 284 \f
 285 /* Return the symbol table.  */
 286
 287 static long
 288 ppcboot_get_symtab (abfd, alocation)
 289      bfd *abfd;
 290      asymbol **alocation;
 291 {
 292   asection *sec = ppcboot_get_tdata (abfd)->sec;
 293   asymbol *syms;
 294   unsigned int i;
 295
 296   syms = (asymbol *) bfd_alloc (abfd, PPCBOOT_SYMS * sizeof (asymbol));
 297   if (syms == NULL)
 298     return false;
 299
 300   /* Start symbol.  */
 301   syms[0].the_bfd = abfd;
 302   syms[0].name = mangle_name (abfd, "start");
 303   syms[0].value = 0;
 304   syms[0].flags = BSF_GLOBAL;
 305   syms[0].section = sec;
 306   syms[0].udata.p = NULL;
 307
 308   /* End symbol.  */
 309   syms[1].the_bfd = abfd;
 310   syms[1].name = mangle_name (abfd, "end");
 311   syms[1].value = sec->_raw_size;
 312   syms[1].flags = BSF_GLOBAL;
 313   syms[1].section = sec;
 314   syms[1].udata.p = NULL;
 315
 316   /* Size symbol.  */
 317   syms[2].the_bfd = abfd;
 318   syms[2].name = mangle_name (abfd, "size");
 319   syms[2].value = sec->_raw_size;
 320   syms[2].flags = BSF_GLOBAL;
 321   syms[2].section = bfd_abs_section_ptr;
 322   syms[2].udata.p = NULL;
 323
 324   for (i = 0; i < PPCBOOT_SYMS; i++)
 325     *alocation++ = syms++;
 326   *alocation = NULL;
 327
 328   return PPCBOOT_SYMS;
 329 }
 330
 331 \f
 332 /* Make an empty symbol.  */
 333
 334 static asymbol *
 335 ppcboot_make_empty_symbol (abfd)
 336      bfd *abfd;
 337 {
 338   return (asymbol *) bfd_alloc (abfd, sizeof (asymbol));
 339 }
 340
 341 \f
 342 #define ppcboot_print_symbol _bfd_nosymbols_print_symbol
 343
 344 /* Get information about a symbol.  */
 345
 346 static void
 347 ppcboot_get_symbol_info (ignore_abfd, symbol, ret)
 348      bfd *ignore_abfd ATTRIBUTE_UNUSED;
 349      asymbol *symbol;
 350      symbol_info *ret;
 351 {
 352   bfd_symbol_info (symbol, ret);
 353 }
 354
 355 #define ppcboot_bfd_is_local_label_name bfd_generic_is_local_label_name
 356 #define ppcboot_get_lineno _bfd_nosymbols_get_lineno
 357 #define ppcboot_find_nearest_line _bfd_nosymbols_find_nearest_line
 358 #define ppcboot_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
 359 #define ppcboot_read_minisymbols _bfd_generic_read_minisymbols
 360 #define ppcboot_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
 361
 362 #define ppcboot_get_reloc_upper_bound \
 363   ((long (*) PARAMS ((bfd *, asection *))) bfd_0l)
 364 #define ppcboot_canonicalize_reloc \
 365   ((long (*) PARAMS ((bfd *, asection *, arelent **, asymbol **))) bfd_0l)
 366 #define ppcboot_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
 367 \f
 368 /* Write section contents of a ppcboot file.  */
 369
 370 static boolean
 371 ppcboot_set_section_contents (abfd, sec, data, offset, size)
 372      bfd *abfd;
 373      asection *sec;
 374      PTR data;
 375      file_ptr offset;
 376      bfd_size_type size;
 377 {
 378   if (! abfd->output_has_begun)
 379     {
 380       bfd_vma low;
 381       asection *s;
 382
 383       /* The lowest section VMA sets the virtual address of the start
 384          of the file.  We use the set the file position of all the
 385          sections.  */
 386       low = abfd->sections->vma;
 387       for (s = abfd->sections->next; s != NULL; s = s->next)
 388         if (s->vma < low)
 389           low = s->vma;
 390
 391       for (s = abfd->sections; s != NULL; s = s->next)
 392         s->filepos = s->vma - low;
 393
 394       abfd->output_has_begun = true;
 395     }
 396
 397   return _bfd_generic_set_section_contents (abfd, sec, data, offset, size);
 398 }
 399
 400 \f
 401 static int
 402 ppcboot_sizeof_headers (abfd, exec)
 403      bfd *abfd ATTRIBUTE_UNUSED;
 404      boolean exec ATTRIBUTE_UNUSED;
 405 {
 406   return sizeof (ppcboot_hdr_t);
 407 }
 408
 409 \f
 410 /* Print out the program headers.  */
 411
 412 static boolean
 413 ppcboot_bfd_print_private_bfd_data (abfd, farg)
 414      bfd *abfd;
 415      PTR farg;
 416 {
 417   FILE *f = (FILE *)farg;
 418   ppcboot_data_t *tdata = ppcboot_get_tdata (abfd);
 419   long entry_offset = bfd_getl_signed_32 ((PTR) tdata->header.entry_offset);
 420   long length = bfd_getl_signed_32 ((PTR) tdata->header.length);
 421   int i;
 422
 423   fprintf (f, _("\nppcboot header:\n"));
 424   fprintf (f, _("Entry offset        = 0x%.8lx (%ld)\n"), entry_offset, entry_offset);
 425   fprintf (f, _("Length              = 0x%.8lx (%ld)\n"), length, length);
 426
 427   if (tdata->header.flags)
 428     fprintf (f, _("Flag field          = 0x%.2x\n"), tdata->header.flags);
 429
 430   if (tdata->header.os_id)
 431     fprintf (f, "OS_ID               = 0x%.2x\n", tdata->header.os_id);
 432
 433   if (tdata->header.partition_name)
 434     fprintf (f, _("Partition name      = \"%s\"\n"), tdata->header.partition_name);
 435
 436   for (i = 0; i < 4; i++)
 437     {
 438       long sector_begin  = bfd_getl_signed_32 ((PTR) tdata->header.partition[i].sector_begin);
 439       long sector_length = bfd_getl_signed_32 ((PTR) tdata->header.partition[i].sector_length);
 440
 441       /* Skip all 0 entries */
 442       if (!tdata->header.partition[i].partition_begin.ind
 443           && !tdata->header.partition[i].partition_begin.head
 444           && !tdata->header.partition[i].partition_begin.sector
 445           && !tdata->header.partition[i].partition_begin.cylinder
 446           && !tdata->header.partition[i].partition_end.ind
 447           && !tdata->header.partition[i].partition_end.head
 448           && !tdata->header.partition[i].partition_end.sector
 449           && !tdata->header.partition[i].partition_end.cylinder
 450           && !sector_begin && !sector_length)
 451         continue;
 452
 453       fprintf (f, _("\nPartition[%d] start  = { 0x%.2x, 0x%.2x, 0x%.2x, 0x%.2x }\n"), i,
 454                tdata->header.partition[i].partition_begin.ind,
 455                tdata->header.partition[i].partition_begin.head,
 456                tdata->header.partition[i].partition_begin.sector,
 457                tdata->header.partition[i].partition_begin.cylinder);
 458
 459       fprintf (f, _("Partition[%d] end    = { 0x%.2x, 0x%.2x, 0x%.2x, 0x%.2x }\n"), i,
 460                tdata->header.partition[i].partition_end.ind,
 461                tdata->header.partition[i].partition_end.head,
 462                tdata->header.partition[i].partition_end.sector,
 463                tdata->header.partition[i].partition_end.cylinder);
 464
 465       fprintf (f, _("Partition[%d] sector = 0x%.8lx (%ld)\n"), i, sector_begin, sector_begin);
 466       fprintf (f, _("Partition[%d] length = 0x%.8lx (%ld)\n"), i, sector_length, sector_length);
 467     }
 468
 469   fprintf (f, "\n");
 470   return true;
 471 }
 472
 473 \f
 474 #define ppcboot_bfd_get_relocated_section_contents \
 475   bfd_generic_get_relocated_section_contents
 476 #define ppcboot_bfd_relax_section bfd_generic_relax_section
 477 #define ppcboot_bfd_gc_sections bfd_generic_gc_sections
 478 #define ppcboot_bfd_merge_sections bfd_generic_merge_sections
 479 #define ppcboot_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
 480 #define ppcboot_bfd_link_add_symbols _bfd_generic_link_add_symbols
 481 #define ppcboot_bfd_final_link _bfd_generic_final_link
 482 #define ppcboot_bfd_link_split_section _bfd_generic_link_split_section
 483 #define ppcboot_get_section_contents_in_window \
 484   _bfd_generic_get_section_contents_in_window
 485
 486 #define ppcboot_bfd_copy_private_bfd_data _bfd_generic_bfd_copy_private_bfd_data
 487 #define ppcboot_bfd_merge_private_bfd_data _bfd_generic_bfd_merge_private_bfd_data
 488 #define ppcboot_bfd_copy_private_section_data _bfd_generic_bfd_copy_private_section_data
 489 #define ppcboot_bfd_copy_private_symbol_data _bfd_generic_bfd_copy_private_symbol_data
 490 #define ppcboot_bfd_set_private_flags _bfd_generic_bfd_set_private_flags
 491 #define ppcboot_bfd_print_private_bfd_dat ppcboot_bfd_print_private_bfd_data
 492
 493 const bfd_target ppcboot_vec =
 494 {
 495   "ppcboot",                    /* name */
 496   bfd_target_unknown_flavour,   /* flavour */
 497   BFD_ENDIAN_BIG,               /* byteorder is big endian for code */
 498   BFD_ENDIAN_LITTLE,            /* header_byteorder */
 499   EXEC_P,                       /* object_flags */
 500   (SEC_ALLOC | SEC_LOAD | SEC_READONLY | SEC_CODE | SEC_DATA
 501    | SEC_ROM | SEC_HAS_CONTENTS), /* section_flags */
 502   0,                            /* symbol_leading_char */
 503   ' ',                          /* ar_pad_char */
 504   16,                           /* ar_max_namelen */
 505   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
 506   bfd_getb32, bfd_getb_signed_32, bfd_putb32,
 507   bfd_getb16, bfd_getb_signed_16, bfd_putb16,   /* data */
 508   bfd_getl64, bfd_getl_signed_64, bfd_putl64,
 509   bfd_getl32, bfd_getl_signed_32, bfd_putl32,
 510   bfd_getl16, bfd_getl_signed_16, bfd_putl16,   /* hdrs */
 511   {                             /* bfd_check_format */
 512     _bfd_dummy_target,
 513     ppcboot_object_p,           /* bfd_check_format */
 514     _bfd_dummy_target,
 515     _bfd_dummy_target,
 516   },
 517   {                             /* bfd_set_format */
 518     bfd_false,
 519     ppcboot_mkobject,
 520     bfd_false,
 521     bfd_false,
 522   },
 523   {                             /* bfd_write_contents */
 524     bfd_false,
 525     bfd_true,
 526     bfd_false,
 527     bfd_false,
 528   },
 529
 530   BFD_JUMP_TABLE_GENERIC (ppcboot),
 531   BFD_JUMP_TABLE_COPY (ppcboot),
 532   BFD_JUMP_TABLE_CORE (_bfd_nocore),
 533   BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
 534   BFD_JUMP_TABLE_SYMBOLS (ppcboot),
 535   BFD_JUMP_TABLE_RELOCS (ppcboot),
 536   BFD_JUMP_TABLE_WRITE (ppcboot),
 537   BFD_JUMP_TABLE_LINK (ppcboot),
 538   BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
 539
 540   NULL,
 541
 542   NULL
 543 };