bfd/mmo.c

   1 /* BFD back-end for mmo objects (MMIX-specific object-format).
   2    Copyright 2001, 2002, 2003, 2004, 2005, 2006
   3    Free Software Foundation, Inc.
   4    Written by Hans-Peter Nilsson (hp@bitrange.com).
   5    Infrastructure and other bits originally copied from srec.c and
   6    binary.c.
   7
   8 This file is part of BFD, the Binary File Descriptor library.
   9
  10 This program is free software; you can redistribute it and/or modify
  11 it under the terms of the GNU General Public License as published by
  12 the Free Software Foundation; either version 2 of the License, or
  13 (at your option) any later version.
  14
  15 This program is distributed in the hope that it will be useful,
  16 but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 GNU General Public License for more details.
  19
  20 You should have received a copy of the GNU General Public License
  21 along with this program; if not, write to the Free Software
  22 Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  23
  24 /*
  25 SECTION
  26         mmo backend
  27
  28         The mmo object format is used exclusively together with Professor
  29         Donald E.@: Knuth's educational 64-bit processor MMIX.  The simulator
  30         @command{mmix} which is available at
  31         @url{http://www-cs-faculty.stanford.edu/~knuth/programs/mmix.tar.gz}
  32         understands this format.  That package also includes a combined
  33         assembler and linker called @command{mmixal}.  The mmo format has
  34         no advantages feature-wise compared to e.g. ELF.  It is a simple
  35         non-relocatable object format with no support for archives or
  36         debugging information, except for symbol value information and
  37         line numbers (which is not yet implemented in BFD).  See
  38         @url{http://www-cs-faculty.stanford.edu/~knuth/mmix.html} for more
  39         information about MMIX.  The ELF format is used for intermediate
  40         object files in the BFD implementation.
  41
  42 @c We want to xref the symbol table node.  A feature in "chew"
  43 @c requires that "commands" do not contain spaces in the
  44 @c arguments.  Hence the hyphen in "Symbol-table".
  45 @menu
  46 @* File layout::
  47 @* Symbol-table::
  48 @* mmo section mapping::
  49 @end menu
  50
  51 INODE
  52 File layout, Symbol-table, mmo, mmo
  53 SUBSECTION
  54         File layout
  55
  56         The mmo file contents is not partitioned into named sections as
  57         with e.g.@: ELF.  Memory areas is formed by specifying the
  58         location of the data that follows.  Only the memory area
  59         @samp{0x0000@dots{}00} to @samp{0x01ff@dots{}ff} is executable, so
  60         it is used for code (and constants) and the area
  61         @samp{0x2000@dots{}00} to @samp{0x20ff@dots{}ff} is used for
  62         writable data.  @xref{mmo section mapping}.
  63
  64         There is provision for specifying ``special data'' of 65536
  65         different types.  We use type 80 (decimal), arbitrarily chosen the
  66         same as the ELF <<e_machine>> number for MMIX, filling it with
  67         section information normally found in ELF objects. @xref{mmo
  68         section mapping}.
  69
  70         Contents is entered as 32-bit words, xor:ed over previous
  71         contents, always zero-initialized.  A word that starts with the
  72         byte @samp{0x98} forms a command called a @samp{lopcode}, where
  73         the next byte distinguished between the thirteen lopcodes.  The
  74         two remaining bytes, called the @samp{Y} and @samp{Z} fields, or
  75         the @samp{YZ} field (a 16-bit big-endian number), are used for
  76         various purposes different for each lopcode.  As documented in
  77         @url{http://www-cs-faculty.stanford.edu/~knuth/mmixal-intro.ps.gz},
  78         the lopcodes are:
  79
  80         @table @code
  81         @item lop_quote
  82         0x98000001.  The next word is contents, regardless of whether it
  83         starts with 0x98 or not.
  84
  85         @item lop_loc
  86         0x9801YYZZ, where @samp{Z} is 1 or 2.  This is a location
  87         directive, setting the location for the next data to the next
  88         32-bit word (for @math{Z = 1}) or 64-bit word (for @math{Z = 2}),
  89         plus @math{Y * 2^56}.  Normally @samp{Y} is 0 for the text segment
  90         and 2 for the data segment.
  91
  92         @item lop_skip
  93         0x9802YYZZ.  Increase the current location by @samp{YZ} bytes.
  94
  95         @item lop_fixo
  96         0x9803YYZZ, where @samp{Z} is 1 or 2.  Store the current location
  97         as 64 bits into the location pointed to by the next 32-bit
  98         (@math{Z = 1}) or 64-bit (@math{Z = 2}) word, plus @math{Y *
  99         2^56}.
 100
 101         @item lop_fixr
 102         0x9804YYZZ.  @samp{YZ} is stored into the current location plus
 103         @math{2 - 4 * YZ}.
 104
 105         @item lop_fixrx
 106         0x980500ZZ.  @samp{Z} is 16 or 24.  A value @samp{L} derived from
 107         the following 32-bit word are used in a manner similar to
 108         @samp{YZ} in lop_fixr: it is xor:ed into the current location
 109         minus @math{4 * L}.  The first byte of the word is 0 or 1.  If it
 110         is 1, then @math{L = (@var{lowest 24 bits of word}) - 2^Z}, if 0,
 111         then @math{L = (@var{lowest 24 bits of word})}.
 112
 113         @item lop_file
 114         0x9806YYZZ.  @samp{Y} is the file number, @samp{Z} is count of
 115         32-bit words.  Set the file number to @samp{Y} and the line
 116         counter to 0.  The next @math{Z * 4} bytes contain the file name,
 117         padded with zeros if the count is not a multiple of four.  The
 118         same @samp{Y} may occur multiple times, but @samp{Z} must be 0 for
 119         all but the first occurrence.
 120
 121         @item lop_line
 122         0x9807YYZZ.  @samp{YZ} is the line number.  Together with
 123         lop_file, it forms the source location for the next 32-bit word.
 124         Note that for each non-lopcode 32-bit word, line numbers are
 125         assumed incremented by one.
 126
 127         @item lop_spec
 128         0x9808YYZZ.  @samp{YZ} is the type number.  Data until the next
 129         lopcode other than lop_quote forms special data of type @samp{YZ}.
 130         @xref{mmo section mapping}.
 131
 132         Other types than 80, (or type 80 with a content that does not
 133         parse) is stored in sections named <<.MMIX.spec_data.@var{n}>>
 134         where @var{n} is the @samp{YZ}-type.  The flags for such a
 135         sections say not to allocate or load the data.  The vma is 0.
 136         Contents of multiple occurrences of special data @var{n} is
 137         concatenated to the data of the previous lop_spec @var{n}s.  The
 138         location in data or code at which the lop_spec occurred is lost.
 139
 140         @item lop_pre
 141         0x980901ZZ.  The first lopcode in a file.  The @samp{Z} field forms the
 142         length of header information in 32-bit words, where the first word
 143         tells the time in seconds since @samp{00:00:00 GMT Jan 1 1970}.
 144
 145         @item lop_post
 146         0x980a00ZZ.  @math{Z > 32}.  This lopcode follows after all
 147         content-generating lopcodes in a program.  The @samp{Z} field
 148         denotes the value of @samp{rG} at the beginning of the program.
 149         The following @math{256 - Z} big-endian 64-bit words are loaded
 150         into global registers @samp{$G} @dots{} @samp{$255}.
 151
 152         @item lop_stab
 153         0x980b0000.  The next-to-last lopcode in a program.  Must follow
 154         immediately after the lop_post lopcode and its data.  After this
 155         lopcode follows all symbols in a compressed format
 156         (@pxref{Symbol-table}).
 157
 158         @item lop_end
 159         0x980cYYZZ.  The last lopcode in a program.  It must follow the
 160         lop_stab lopcode and its data.  The @samp{YZ} field contains the
 161         number of 32-bit words of symbol table information after the
 162         preceding lop_stab lopcode.
 163         @end table
 164
 165         Note that the lopcode "fixups"; <<lop_fixr>>, <<lop_fixrx>> and
 166         <<lop_fixo>> are not generated by BFD, but are handled.  They are
 167         generated by <<mmixal>>.
 168
 169 EXAMPLE
 170         This trivial one-label, one-instruction file:
 171
 172 | :Main TRAP 1,2,3
 173
 174         can be represented this way in mmo:
 175
 176 | 0x98090101 - lop_pre, one 32-bit word with timestamp.
 177 | <timestamp>
 178 | 0x98010002 - lop_loc, text segment, using a 64-bit address.
 179 |              Note that mmixal does not emit this for the file above.
 180 | 0x00000000 - Address, high 32 bits.
 181 | 0x00000000 - Address, low 32 bits.
 182 | 0x98060002 - lop_file, 2 32-bit words for file-name.
 183 | 0x74657374 - "test"
 184 | 0x2e730000 - ".s\0\0"
 185 | 0x98070001 - lop_line, line 1.
 186 | 0x00010203 - TRAP 1,2,3
 187 | 0x980a00ff - lop_post, setting $255 to 0.
 188 | 0x00000000
 189 | 0x00000000
 190 | 0x980b0000 - lop_stab for ":Main" = 0, serial 1.
 191 | 0x203a4040   @xref{Symbol-table}.
 192 | 0x10404020
 193 | 0x4d206120
 194 | 0x69016e00
 195 | 0x81000000
 196 | 0x980c0005 - lop_end; symbol table contained five 32-bit words.  */
 197
 198 #include "bfd.h"
 199 #include "sysdep.h"
 200 #include "libbfd.h"
 201 #include "libiberty.h"
 202 #include "elf/mmix.h"
 203 #include "opcode/mmix.h"
 204
 205 #define LOP 0x98
 206 #define LOP_QUOTE 0
 207 #define LOP_LOC 1
 208 #define LOP_SKIP 2
 209 #define LOP_FIXO 3
 210 #define LOP_FIXR 4
 211 #define LOP_FIXRX 5
 212 #define LOP_FILE 6
 213 #define LOP_LINE 7
 214 #define LOP_SPEC 8
 215 #define LOP_PRE 9
 216 #define LOP_POST 10
 217 #define LOP_STAB 11
 218 #define LOP_END 12
 219
 220 #define LOP_QUOTE_NEXT ((LOP << 24) | (LOP_QUOTE << 16) | 1)
 221 #define SPEC_DATA_SECTION 80
 222 #define LOP_SPEC_SECTION \
 223  ((LOP << 24) | (LOP_SPEC << 16) | SPEC_DATA_SECTION)
 224
 225 /* Must be a power of two.  If you change this to be >= 64k, you need a
 226    new test-case; the ld test b-loc64k.d touches chunk-size problem areas.  */
 227 #define MMO_SEC_CONTENTS_CHUNK_SIZE (1 << 15)
 228
 229 /* An arbitrary number for the maximum length section name size.  */
 230 #define MAX_SECTION_NAME_SIZE (1024 * 1024)
 231
 232 /* A quite arbitrary number for the maximum length section size.  */
 233 #define MAX_ARTIFICIAL_SECTION_SIZE (1024 * 1024 * 1024)
 234
 235 #define MMO3_WCHAR 0x80
 236 #define MMO3_LEFT 0x40
 237 #define MMO3_MIDDLE 0x20
 238 #define MMO3_RIGHT 0x10
 239 #define MMO3_TYPEBITS 0xf
 240 #define MMO3_REGQUAL_BITS 0xf
 241 #define MMO3_UNDEF 2
 242 #define MMO3_DATA 8
 243 #define MMO3_SYMBITS 0x2f
 244
 245 /* Put these everywhere in new code.  */
 246 #define FATAL_DEBUG                                             \
 247  _bfd_abort (__FILE__, __LINE__,                                \
 248              "Internal: Non-debugged code (test-case missing)")
 249
 250 #define BAD_CASE(x)                             \
 251  _bfd_abort (__FILE__, __LINE__,                \
 252              "bad case for " #x)
 253
 254 enum mmo_sym_type { mmo_reg_sym, mmo_undef_sym, mmo_data_sym, mmo_abs_sym};
 255
 256 /* When scanning the mmo file, a linked list of mmo_symbol
 257    structures is built to represent the symbol table (if there is
 258    one).  */
 259
 260 struct mmo_symbol
 261   {
 262     struct mmo_symbol *next;
 263     char *name;
 264     bfd_vma value;
 265     enum mmo_sym_type sym_type;
 266     unsigned int serno;
 267   };
 268
 269 struct mmo_data_list_struct
 270   {
 271     struct mmo_data_list_struct *next;
 272     bfd_vma where;
 273     bfd_size_type size;
 274     bfd_size_type allocated_size;
 275     bfd_byte data[1];
 276   };
 277
 278 typedef struct mmo_data_list_struct mmo_data_list_type;
 279
 280 struct mmo_symbol_trie
 281   {
 282     struct mmo_symbol_trie *left;
 283     struct mmo_symbol_trie *right;
 284     struct mmo_symbol_trie *middle;
 285
 286     bfd_byte symchar;
 287
 288     /* A zero name means there's nothing here.  */
 289     struct mmo_symbol sym;
 290   };
 291
 292 /* The mmo tdata information.  */
 293
 294 struct mmo_data_struct
 295   {
 296     struct mmo_symbol *symbols;
 297     struct mmo_symbol *symtail;
 298     asymbol *csymbols;
 299
 300     /* File representation of time (NULL) when this file was created.  */
 301     bfd_byte created[4];
 302
 303     /* When we're reading bytes recursively, check this occasionally.
 304        Also holds write errors.  */
 305     bfd_boolean have_error;
 306
 307     /* Max symbol length that may appear in the lop_stab table.  Note that
 308        this table might just hold a subset of symbols for not-really large
 309        programs, as it can only be 65536 * 4 bytes large.  */
 310     int max_symbol_length;
 311
 312     /* Here's the symbol we build in lop_stab.  */
 313     char *lop_stab_symbol;
 314
 315     /* Index into lop_stab_symbol for the next character when parsing the
 316        symbol information.  */
 317     int symbol_position;
 318
 319     /* When creating arbitrary sections, we need to count section numbers.  */
 320     int sec_no;
 321
 322     /* When writing or reading byte-wise, we need to count the bytes
 323        within a 32-bit word.  */
 324     int byte_no;
 325
 326     /* We also need a buffer to hold the bytes we count reading or writing.  */
 327     bfd_byte buf[4];
 328   };
 329
 330 typedef struct mmo_data_struct tdata_type;
 331
 332 struct mmo_section_data_struct
 333   {
 334     mmo_data_list_type *head;
 335     mmo_data_list_type *tail;
 336   };
 337
 338 #define mmo_section_data(sec) \
 339   ((struct mmo_section_data_struct *) (sec)->used_by_bfd)
 340
 341 /* These structures are used in bfd_map_over_sections constructs.  */
 342
 343 /* Used when writing out sections; all but the register contents section
 344    which is stored in reg_section.  */
 345 struct mmo_write_sec_info
 346   {
 347     asection *reg_section;
 348     bfd_boolean retval;
 349   };
 350
 351 /* Used when trying to find a section corresponding to addr.  */
 352 struct mmo_find_sec_info
 353   {
 354     asection *sec;
 355     bfd_vma addr;
 356   };
 357
 358 static bfd_boolean mmo_bfd_copy_private_bfd_data (bfd *, bfd *);
 359 static void mmo_write_section_unless_reg_contents (bfd *, asection *, void *);
 360 static void mmo_find_sec_w_addr (bfd *, asection *, void *);
 361 static void mmo_find_sec_w_addr_grow (bfd *, asection *, void *);
 362 static asection *mmo_make_section (bfd *, const char *);
 363 static void mmo_get_symbol_info (bfd *, asymbol *, symbol_info *);
 364 static void mmo_print_symbol (bfd *, void *, asymbol *,
 365                               bfd_print_symbol_type);
 366 static void mmo_init (void);
 367 static bfd_boolean mmo_mkobject (bfd *);
 368 static bfd_boolean mmo_scan (bfd *);
 369 static asection *mmo_decide_section (bfd *, bfd_vma);
 370 static asection *mmo_get_generic_spec_data_section (bfd *, int);
 371 static asection *mmo_get_spec_section (bfd *, int);
 372 static INLINE bfd_byte *mmo_get_loc (asection *, bfd_vma, int);
 373 static void mmo_xore_64 (asection *, bfd_vma vma, bfd_vma value);
 374 static void mmo_xore_32 (asection *, bfd_vma vma, unsigned int);
 375 static void mmo_xore_16 (asection *, bfd_vma vma, unsigned int);
 376 static const bfd_target *mmo_object_p (bfd *);
 377 static void mmo_map_set_sizes (bfd *, asection *, void *);
 378 static bfd_boolean mmo_get_symbols (bfd *);
 379 static bfd_boolean mmo_create_symbol (bfd *, const char *, bfd_vma,
 380                                       enum mmo_sym_type, unsigned int);
 381 static bfd_boolean mmo_get_section_contents (bfd *, asection *, void *,
 382                                              file_ptr, bfd_size_type);
 383 static long mmo_get_symtab_upper_bound (bfd *);
 384 static long mmo_canonicalize_symtab (bfd *, asymbol **);
 385 static void mmo_get_symbol_info (bfd *, asymbol *, symbol_info *);
 386 static void mmo_print_symbol (bfd *, void *, asymbol *,
 387                               bfd_print_symbol_type);
 388 static bfd_boolean mmo_set_section_contents (bfd *, sec_ptr, const void *,
 389                                              file_ptr, bfd_size_type);
 390 static int mmo_sizeof_headers (bfd *, struct bfd_link_info *);
 391 static long mmo_get_reloc_upper_bound (bfd *, asection *);
 392 static bfd_boolean mmo_internal_write_header (bfd *);
 393 static bfd_boolean mmo_internal_write_post (bfd *, int, asection *);
 394 static bfd_boolean mmo_internal_add_3_sym (bfd *, struct mmo_symbol_trie *,
 395                                            const struct mmo_symbol *);
 396 static unsigned int mmo_internal_3_length (bfd *, struct mmo_symbol_trie *);
 397 static void mmo_internal_3_dump (bfd *, struct mmo_symbol_trie *);
 398 static void mmo_beb128_out (bfd *, int, int);
 399 static bfd_boolean mmo_internal_write_section (bfd *, asection *);
 400 static void mmo_write_tetra (bfd *, unsigned int);
 401 static void mmo_write_tetra_raw (bfd *, unsigned int);
 402 static void mmo_write_octa (bfd *, bfd_vma);
 403 static void mmo_write_octa_raw (bfd *, bfd_vma);
 404 static bfd_boolean mmo_write_chunk (bfd *, const bfd_byte *, unsigned int);
 405 static bfd_boolean mmo_flush_chunk (bfd *);
 406 static bfd_boolean mmo_write_loc_chunk (bfd *, bfd_vma, const bfd_byte *,
 407                                         unsigned int, bfd_vma *);
 408 static bfd_boolean mmo_write_chunk_list (bfd *, mmo_data_list_type *);
 409 static bfd_boolean mmo_write_loc_chunk_list (bfd *, mmo_data_list_type *);
 410 static bfd_boolean mmo_write_symbols_and_terminator (bfd *);
 411 static flagword mmo_sec_flags_from_bfd_flags (flagword);
 412 static flagword bfd_sec_flags_from_mmo_flags (flagword);
 413 static bfd_byte mmo_get_byte (bfd *);
 414 static void mmo_write_byte (bfd *, bfd_byte);
 415 static bfd_boolean mmo_new_section_hook (bfd *, asection *);
 416 static int mmo_sort_mmo_symbols (const void *, const void *);
 417 static bfd_boolean mmo_write_object_contents (bfd *);
 418 static long mmo_canonicalize_reloc (bfd *, sec_ptr, arelent **, asymbol **);
 419 static bfd_boolean mmo_write_section_description (bfd *, asection *);
 420 static bfd_boolean mmo_has_leading_or_trailing_zero_tetra_p (bfd *,
 421                                                              asection *);
 422
 423 /* Global "const" variables initialized once.  Must not depend on
 424    particular input or caller; put such things into the bfd or elsewhere.
 425    Look ma, no static per-invocation data!  */
 426
 427 static
 428 char valid_mmo_symbol_character_set[/* A-Z a-z (we assume consecutive
 429                                        codes; sorry EBCDIC:ers!).  */
 430                                     + 'Z' - 'A' + 1 + 'z' - 'a' + 1
 431                                     /* Digits.  */
 432                                     + 10
 433                                     /* ':' and '_'.  */
 434                                     + 1 + 1
 435                                     /* Codes higher than 126.  */
 436                                     + 256 - 126
 437                                     /* Ending zero.  */
 438                                     + 1];
 439
 440
 441 /* Get section SECNAME or create one if it doesn't exist.  When creating
 442    one, new memory for the name is allocated.  */
 443
 444 static asection *
 445 mmo_make_section (bfd *abfd, const char *secname)
 446 {
 447   asection *sec = bfd_get_section_by_name (abfd, secname);
 448
 449   if (sec == NULL)
 450     {
 451       char *newsecname = strdup (secname);
 452
 453       if (newsecname == NULL)
 454         {
 455           (*_bfd_error_handler)
 456             (_("%s: No core to allocate section name %s\n"),
 457              bfd_get_filename (abfd), secname);
 458           bfd_set_error (bfd_error_system_call);
 459           return NULL;
 460         }
 461       sec = bfd_make_section (abfd, newsecname);
 462     }
 463
 464   return sec;
 465 }
 466
 467 /* Nothing to do, but keep as a placeholder if we need it.
 468    Note that state that might differ between bfd:s must not be initialized
 469    here, nor must it be static.  Add it to tdata information instead.  */
 470
 471 static void
 472 mmo_init (void)
 473 {
 474   static bfd_boolean inited = FALSE;
 475   int i = 0;
 476   int j = 0;
 477   static const char letters[]
 478     = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789:_";
 479
 480   if (inited)
 481     return;
 482   inited = TRUE;
 483
 484   /* Fill in the set of valid symbol characters.  */
 485   strcpy (valid_mmo_symbol_character_set, letters);
 486   i = strlen (letters);
 487
 488   for (j = 126; j < 256; j++)
 489     valid_mmo_symbol_character_set[i++] = j;
 490 }
 491
 492 /* Check whether an existing file is an mmo file.  */
 493
 494 static const bfd_target *
 495 mmo_object_p (bfd *abfd)
 496 {
 497   struct stat statbuf;
 498   bfd_byte b[4];
 499
 500   mmo_init ();
 501
 502   if (bfd_stat (abfd, &statbuf) < 0
 503       || bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0
 504       || bfd_bread (b, 4, abfd) != 4)
 505     goto bad_final;
 506
 507   /* All mmo files are a multiple of four bytes long.
 508      Only recognize version one.  */
 509   if ((statbuf.st_size % 4) != 0
 510       || b[0] != LOP || b[1] != LOP_PRE || b[2] != 1)
 511     goto bad_format;
 512
 513   /* Get the last 32-bit word.  */
 514   if (bfd_seek (abfd, (file_ptr) statbuf.st_size - 4, SEEK_SET) != 0
 515       || bfd_bread (b, 4, abfd) != 4)
 516     goto bad_final;
 517
 518   /* Check if the file ends in a lop_end lopcode. */
 519   if (b[0] != LOP || b[1] != LOP_END || ! mmo_mkobject (abfd))
 520     goto bad_format;
 521
 522   /* Compute an upper bound on the max symbol length.  Not really
 523      important as all of the symbol information can only be 256k.  */
 524   abfd->tdata.mmo_data->max_symbol_length = (b[2] * 256 + b[3]) * 4;
 525   abfd->tdata.mmo_data->lop_stab_symbol
 526     = bfd_malloc (abfd->tdata.mmo_data->max_symbol_length + 1);
 527
 528   if (abfd->tdata.mmo_data->lop_stab_symbol == NULL)
 529     {
 530       (*_bfd_error_handler)
 531         (_("%s: No core to allocate a symbol %d bytes long\n"),
 532          bfd_get_filename (abfd), abfd->tdata.mmo_data->max_symbol_length);
 533       goto bad_final;
 534     }
 535
 536   /* Read in everything.  */
 537   if (! mmo_scan (abfd))
 538     goto bad_format_free;
 539
 540   if (abfd->symcount > 0)
 541     abfd->flags |= HAS_SYMS;
 542
 543   /* You'll have to tweak this if you want to use this format for other
 544      arches (not recommended due to its small-size limitations).  Look at
 545      the ELF format for how to make it target-generic.  */
 546   if (! bfd_default_set_arch_mach (abfd, bfd_arch_mmix, 0))
 547     goto bad_format_free;
 548
 549   return abfd->xvec;
 550
 551  bad_format_free:
 552   free (abfd->tdata.mmo_data->lop_stab_symbol);
 553  bad_format:
 554   bfd_set_error (bfd_error_wrong_format);
 555  bad_final:
 556   return NULL;
 557 }
 558
 559 /* Set up the mmo tdata information.  */
 560
 561 static bfd_boolean
 562 mmo_mkobject (bfd *abfd)
 563 {
 564   mmo_init ();
 565
 566   if (abfd->tdata.mmo_data == NULL)
 567     {
 568       time_t created;
 569
 570       /* All fields are zero-initialized, so we don't have to explicitly
 571          initialize most.  */
 572       tdata_type *tdata = (tdata_type *) bfd_zmalloc (sizeof (tdata_type));
 573       if (tdata == NULL)
 574         return FALSE;
 575
 576       created = time (NULL);
 577       bfd_put_32 (abfd, created, tdata->created);
 578
 579       abfd->tdata.mmo_data = tdata;
 580     }
 581
 582   return TRUE;
 583 }
 584
 585 static bfd_boolean
 586 mmo_bfd_copy_private_bfd_data (bfd *ibfd, bfd *obfd)
 587 {
 588   if (bfd_get_flavour (ibfd) != bfd_target_mmo_flavour
 589       || bfd_get_flavour (obfd) != bfd_target_mmo_flavour)
 590     return TRUE;
 591
 592   /* Copy the time the copied-from file was created.  If people want the
 593      time the file was last *modified*, they have that in the normal file
 594      information.  */
 595   memcpy (obfd->tdata.mmo_data->created, ibfd->tdata.mmo_data->created,
 596           sizeof (obfd->tdata.mmo_data->created));
 597   return TRUE;
 598 }
 599
 600 /* Helper functions for mmo_decide_section, used through
 601    bfd_map_over_sections.  */
 602
 603 static void
 604 mmo_find_sec_w_addr (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *p)
 605 {
 606   struct mmo_find_sec_info *infop = (struct mmo_find_sec_info *) p;
 607   bfd_vma vma = bfd_get_section_vma (abfd, sec);
 608
 609   /* Ignore sections that aren't loaded.  */
 610   if ((bfd_get_section_flags (abfd, sec) & (SEC_LOAD | SEC_ALLOC))
 611       !=  (SEC_LOAD | SEC_ALLOC))
 612     return;
 613
 614   if (infop->addr >= vma && infop->addr < vma + sec->size)
 615     infop->sec = sec;
 616 }
 617
 618 static void
 619 mmo_find_sec_w_addr_grow (bfd *abfd ATTRIBUTE_UNUSED, asection *sec, void *p)
 620 {
 621   struct mmo_find_sec_info *infop = (struct mmo_find_sec_info *) p;
 622   bfd_vma vma = bfd_get_section_vma (abfd, sec);
 623
 624   /* Ignore sections that aren't loaded.  */
 625   if ((bfd_get_section_flags (abfd, sec) & (SEC_LOAD | SEC_ALLOC))
 626       !=  (SEC_LOAD | SEC_ALLOC))
 627     return;
 628
 629   if (infop->addr >= vma && infop->addr < vma + MAX_ARTIFICIAL_SECTION_SIZE)
 630     infop->sec = sec;
 631 }
 632
 633 /* Find a section that corresponds to a VMA.  Automatically create .text
 634    or .data and set current section to it, depending on what vma.  If we
 635    can't deduce a section, make one up as ".MMIX.sec.N", where N is an
 636    increasing number.  */
 637
 638 static asection *
 639 mmo_decide_section (bfd *abfd, bfd_vma vma)
 640 {
 641   asection *sec = NULL;
 642   char sec_name[sizeof (".MMIX.sec.") + 20];
 643   struct mmo_find_sec_info info;
 644
 645   info.addr = vma;
 646   info.sec = NULL;
 647
 648   /* First see if there's a section that would match exactly.  */
 649   bfd_map_over_sections (abfd, mmo_find_sec_w_addr, &info);
 650
 651   if (info.sec != NULL)
 652     return info.sec;
 653
 654   /* If there's no such section, try and expand one of the existing ones,
 655      up to a limit.  Make sure we have .text and .data before we try that;
 656      create them corresponding to expected addresses and set flags to make
 657      them match the "loaded and with contents" expectation.  */
 658   if ((vma >> 56) == 0)
 659     {
 660       sec = bfd_make_section_old_way (abfd, MMO_TEXT_SECTION_NAME);
 661
 662       if (sec == NULL)
 663         return NULL;
 664
 665       if (! sec->user_set_vma)
 666         bfd_set_section_vma (abfd, sec, vma);
 667       if (! bfd_set_section_flags (abfd, sec,
 668                                    bfd_get_section_flags (abfd, sec)
 669                                    | SEC_CODE | SEC_LOAD | SEC_ALLOC))
 670         return NULL;
 671     }
 672   else if ((vma >> 56) == 0x20)
 673     {
 674       sec = bfd_make_section_old_way (abfd, MMO_DATA_SECTION_NAME);
 675
 676       if (sec == NULL)
 677         return NULL;
 678
 679       if (! sec->user_set_vma)
 680         bfd_set_section_vma (abfd, sec, vma);
 681       if (! bfd_set_section_flags (abfd, sec,
 682                                    bfd_get_section_flags (abfd, sec)
 683                                    | SEC_LOAD | SEC_ALLOC))
 684         return NULL;
 685     }
 686
 687   bfd_map_over_sections (abfd, mmo_find_sec_w_addr_grow, &info);
 688
 689   if (info.sec != NULL)
 690     return info.sec;
 691
 692   /* If there's still no suitable section, make a new one.  */
 693   sprintf (sec_name, ".MMIX.sec.%d", abfd->tdata.mmo_data->sec_no++);
 694   sec = mmo_make_section (abfd, sec_name);
 695   if (! sec->user_set_vma)
 696     bfd_set_section_vma (abfd, sec, vma);
 697
 698   if (! bfd_set_section_flags (abfd, sec,
 699                                bfd_get_section_flags (abfd, sec)
 700                                | SEC_LOAD | SEC_ALLOC))
 701     return NULL;
 702   return sec;
 703 }
 704
 705 /* Xor in a 64-bit value VALUE at VMA.  */
 706
 707 static INLINE void
 708 mmo_xore_64 (asection *sec, bfd_vma vma, bfd_vma value)
 709 {
 710   bfd_byte *loc = mmo_get_loc (sec, vma, 8);
 711   bfd_vma prev = bfd_get_64 (sec->owner, loc);
 712
 713   value ^= prev;
 714   bfd_put_64 (sec->owner, value, loc);
 715 }
 716
 717 /* Xor in a 32-bit value VALUE at VMA.  */
 718
 719 static INLINE void
 720 mmo_xore_32 (asection *sec, bfd_vma vma, unsigned int value)
 721 {
 722   bfd_byte *loc = mmo_get_loc (sec, vma, 4);
 723   unsigned int prev = bfd_get_32 (sec->owner, loc);
 724
 725   value ^= prev;
 726   bfd_put_32 (sec->owner, value, loc);
 727 }
 728
 729 /* Xor in a 16-bit value VALUE at VMA.  */
 730
 731 static INLINE void
 732 mmo_xore_16 (asection *sec, bfd_vma vma, unsigned int value)
 733 {
 734   bfd_byte *loc = mmo_get_loc (sec, vma, 2);
 735   unsigned int prev = bfd_get_16 (sec->owner, loc);
 736
 737   value ^= prev;
 738   bfd_put_16 (sec->owner, value, loc);
 739 }
 740
 741 /* Write a 32-bit word to output file, no lop_quote generated.  */
 742
 743 static INLINE void
 744 mmo_write_tetra_raw (bfd *abfd, unsigned int value)
 745 {
 746   bfd_byte buf[4];
 747
 748   bfd_put_32 (abfd, value, buf);
 749
 750   if (bfd_bwrite (buf, 4, abfd) != 4)
 751     abfd->tdata.mmo_data->have_error = TRUE;
 752 }
 753
 754 /* Write a 32-bit word to output file; lop_quote if necessary.  */
 755
 756 static INLINE void
 757 mmo_write_tetra (bfd *abfd, unsigned int value)
 758 {
 759   if (((value >> 24) & 0xff) == LOP)
 760     mmo_write_tetra_raw (abfd, LOP_QUOTE_NEXT);
 761
 762   mmo_write_tetra_raw (abfd, value);
 763 }
 764
 765 /* Write a 64-bit word to output file, perhaps with lop_quoting.  */
 766
 767 static INLINE void
 768 mmo_write_octa (bfd *abfd, bfd_vma value)
 769 {
 770   mmo_write_tetra (abfd, (unsigned int) (value >> 32));
 771   mmo_write_tetra (abfd, (unsigned int) value);
 772 }
 773
 774 /* Write a 64-bit word to output file, without lop_quoting.  */
 775
 776 static INLINE void
 777 mmo_write_octa_raw (bfd *abfd, bfd_vma value)
 778 {
 779   mmo_write_tetra_raw (abfd, (unsigned int) (value >> 32));
 780   mmo_write_tetra_raw (abfd, (unsigned int) value);
 781 }
 782
 783 /* Write quoted contents.  Intended to be called multiple times in
 784    sequence, followed by a call to mmo_flush_chunk.  */
 785
 786 static INLINE bfd_boolean
 787 mmo_write_chunk (bfd *abfd, const bfd_byte *loc, unsigned int len)
 788 {
 789   bfd_boolean retval = TRUE;
 790
 791   /* Fill up a tetra from bytes remaining from a previous chunk.  */
 792   if (abfd->tdata.mmo_data->byte_no != 0)
 793     {
 794       while (abfd->tdata.mmo_data->byte_no < 4 && len != 0)
 795         {
 796           abfd->tdata.mmo_data->buf[abfd->tdata.mmo_data->byte_no++] = *loc++;
 797           len--;
 798         }
 799
 800       if (abfd->tdata.mmo_data->byte_no == 4)
 801         {
 802           mmo_write_tetra (abfd,
 803                            bfd_get_32 (abfd, abfd->tdata.mmo_data->buf));
 804           abfd->tdata.mmo_data->byte_no = 0;
 805         }
 806     }
 807
 808   while (len >= 4)
 809     {
 810       if (loc[0] == LOP)
 811         mmo_write_tetra_raw (abfd, LOP_QUOTE_NEXT);
 812
 813       retval = (retval
 814                 && ! abfd->tdata.mmo_data->have_error
 815                 && 4 == bfd_bwrite (loc, 4, abfd));
 816
 817       loc += 4;
 818       len -= 4;
 819     }
 820
 821   if (len)
 822     {
 823       memcpy (abfd->tdata.mmo_data->buf, loc, len);
 824       abfd->tdata.mmo_data->byte_no = len;
 825     }
 826
 827   if (! retval)
 828     abfd->tdata.mmo_data->have_error = TRUE;
 829   return retval;
 830 }
 831
 832 /* Flush remaining bytes, from a previous mmo_write_chunk, zero-padded to
 833    4 bytes.  */
 834
 835 static INLINE bfd_boolean
 836 mmo_flush_chunk (bfd *abfd)
 837 {
 838   if (abfd->tdata.mmo_data->byte_no != 0)
 839     {
 840       memset (abfd->tdata.mmo_data->buf + abfd->tdata.mmo_data->byte_no,
 841               0, 4 - abfd->tdata.mmo_data->byte_no);
 842       mmo_write_tetra (abfd,
 843                        bfd_get_32 (abfd, abfd->tdata.mmo_data->buf));
 844       abfd->tdata.mmo_data->byte_no = 0;
 845     }
 846
 847   return ! abfd->tdata.mmo_data->have_error;
 848 }
 849
 850 /* Same, but from a list.  */
 851
 852 static INLINE bfd_boolean
 853 mmo_write_chunk_list (bfd *abfd, mmo_data_list_type *datap)
 854 {
 855   for (; datap != NULL; datap = datap->next)
 856     if (! mmo_write_chunk (abfd, datap->data, datap->size))
 857       return FALSE;
 858
 859   return mmo_flush_chunk (abfd);
 860 }
 861
 862 /* Write a lop_loc and some contents.  A caller needs to call
 863    mmo_flush_chunk after calling this function.  The location is only
 864    output if different than *LAST_VMAP, which is updated after this call.  */
 865
 866 static bfd_boolean
 867 mmo_write_loc_chunk (bfd *abfd, bfd_vma vma, const bfd_byte *loc,
 868                      unsigned int len, bfd_vma *last_vmap)
 869 {
 870   /* Find an initial and trailing section of zero tetras; we don't need to
 871      write out zeros.  FIXME: When we do this, we should emit section size
 872      and address specifiers, else objcopy can't always perform an identity
 873      translation.  Only do this if we *don't* have left-over data from a
 874      previous write or the vma of this chunk is *not* the next address,
 875      because then data isn't tetrabyte-aligned and we're concatenating to
 876      that left-over data.  */
 877
 878   if (abfd->tdata.mmo_data->byte_no == 0 || vma != *last_vmap)
 879     {
 880       while (len >= 4 && bfd_get_32 (abfd, loc) == 0)
 881         {
 882           vma += 4;
 883           len -= 4;
 884           loc += 4;
 885         }
 886
 887       while (len >= 4 && bfd_get_32 (abfd, loc + len - 4) == 0)
 888         len -= 4;
 889     }
 890
 891   /* Only write out the location if it's different than the one the caller
 892      (supposedly) previously handled, accounting for omitted leading zeros.  */
 893   if (vma != *last_vmap)
 894     {
 895       /* We might be in the middle of a sequence.  */
 896       mmo_flush_chunk (abfd);
 897
 898       /* We always write the location as 64 bits; no use saving bytes
 899          here.  */
 900       mmo_write_tetra_raw (abfd, (LOP << 24) | (LOP_LOC << 16) | 2);
 901       mmo_write_octa_raw (abfd, vma);
 902     }
 903
 904   /* Update to reflect end of this chunk, with trailing zeros omitted.  */
 905   *last_vmap = vma + len;
 906
 907   return (! abfd->tdata.mmo_data->have_error
 908           && mmo_write_chunk (abfd, loc, len));
 909 }
 910
 911 /* Same, but from a list.  */
 912
 913 static INLINE bfd_boolean
 914 mmo_write_loc_chunk_list (bfd *abfd, mmo_data_list_type *datap)
 915 {
 916   /* Get an address different than the address of the first chunk.  */
 917   bfd_vma last_vma = datap ? datap->where - 1 : 0;
 918
 919   for (; datap != NULL; datap = datap->next)
 920     if (! mmo_write_loc_chunk (abfd, datap->where, datap->data, datap->size,
 921                                &last_vma))
 922       return FALSE;
 923
 924   return mmo_flush_chunk (abfd);
 925 }
 926
 927 /* Make a .MMIX.spec_data.N section.  */
 928
 929 static asection *
 930 mmo_get_generic_spec_data_section (bfd *abfd, int spec_data_number)
 931 {
 932   asection *sec;
 933   char secname[sizeof (MMIX_OTHER_SPEC_SECTION_PREFIX) + 20]
 934     = MMIX_OTHER_SPEC_SECTION_PREFIX;
 935
 936   sprintf (secname + strlen (MMIX_OTHER_SPEC_SECTION_PREFIX),
 937            "%d", spec_data_number);
 938
 939   sec = mmo_make_section (abfd, secname);
 940
 941   return sec;
 942 }
 943
 944 /* Make a special section for SPEC_DATA_NUMBER.  If it is the one we use
 945    ourselves, parse some of its data to get at the section name.  */
 946
 947 static asection *
 948 mmo_get_spec_section (bfd *abfd, int spec_data_number)
 949 {
 950   char *secname;
 951   asection *sec;
 952   bfd_byte buf[4];
 953   unsigned int secname_length;
 954   unsigned int i;
 955   bfd_vma section_length;
 956   bfd_vma section_vma;
 957   mmo_data_list_type *loc;
 958   flagword flags;
 959   long orig_pos;
 960
 961   /* If this isn't the "special" special data, then make a placeholder
 962      section.  */
 963   if (spec_data_number != SPEC_DATA_SECTION)
 964     return mmo_get_generic_spec_data_section (abfd, spec_data_number);
 965
 966   /* Seek back to this position if there was a format error.  */
 967   orig_pos = bfd_tell (abfd);
 968
 969   /* Read the length (in 32-bit words).  */
 970   if (bfd_bread (buf, 4, abfd) != 4)
 971     goto format_error;
 972
 973   if (buf[0] == LOP)
 974     {
 975       if (buf[1] != LOP_QUOTE)
 976         goto format_error;
 977
 978       if (bfd_bread (buf, 4, abfd) != 4)
 979         goto format_error;
 980     }
 981
 982   /* We don't care to keep the name length accurate.  It's
 983      zero-terminated.  */
 984   secname_length = bfd_get_32 (abfd, buf) * 4;
 985
 986   /* Check section name length for sanity.  */
 987   if (secname_length > MAX_SECTION_NAME_SIZE)
 988     goto format_error;
 989
 990   /* This should be free'd regardless if a section is created.  */
 991   secname = bfd_malloc (secname_length + 1);
 992   secname[secname_length] = 0;
 993
 994   for (i = 0; i < secname_length / 4; i++)
 995     {
 996       if (bfd_bread (secname + i * 4, 4, abfd) != 4)
 997         goto format_error_free;
 998
 999       if (secname[i * 4] == (char) LOP)
1000         {
1001           /* A bit of overkill, but we handle char 0x98 in a section name,
1002              and recognize misparsing.  */
1003           if (secname[i * 4 + 1] != LOP_QUOTE
1004               || bfd_bread (secname + i * 4, 4, abfd) != 4)
1005             /* Whoops.  We thought this was a name, and now we found a
1006                non-lop_quote lopcode before we parsed the whole length of
1007                the name.  Signal end-of-file in the same manner.  */
1008               goto format_error_free;
1009         }
1010     }
1011
1012   /* Get the section flags.  */
1013   if (bfd_bread (buf, 4, abfd) != 4
1014       || (buf[0] == LOP
1015           && (buf[1] != LOP_QUOTE || bfd_bread (buf, 4, abfd) != 4)))
1016     goto format_error_free;
1017
1018   flags = bfd_get_32 (abfd, buf);
1019
1020   /* Get the section length.  */
1021   if (bfd_bread (buf, 4, abfd) != 4
1022       || (buf[0] == LOP
1023           && (buf[1] != LOP_QUOTE || bfd_bread (buf, 4, abfd) != 4)))
1024     goto format_error_free;
1025
1026   section_length = (bfd_vma) bfd_get_32 (abfd, buf) << 32;
1027
1028   /* That's the first, high-part.  Now get the low part.  */
1029
1030   if (bfd_bread (buf, 4, abfd) != 4
1031       || (buf[0] == LOP
1032           && (buf[1] != LOP_QUOTE || bfd_bread (buf, 4, abfd) != 4)))
1033     goto format_error_free;
1034
1035   section_length |= (bfd_vma) bfd_get_32 (abfd, buf);
1036
1037   /* Check the section length for sanity.  */
1038   if (section_length > MAX_ARTIFICIAL_SECTION_SIZE)
1039     goto format_error_free;
1040
1041   /* Get the section VMA.  */
1042   if (bfd_bread (buf, 4, abfd) != 4
1043       || (buf[0] == LOP
1044           && (buf[1] != LOP_QUOTE || bfd_bread (buf, 4, abfd) != 4)))
1045     goto format_error_free;
1046
1047   section_vma = (bfd_vma) bfd_get_32 (abfd, buf) << 32;
1048
1049   /* That's the first, high-part.  Now get the low part.  */
1050   if (bfd_bread (buf, 4, abfd) != 4
1051       || (buf[0] == LOP
1052           && (buf[1] != LOP_QUOTE || bfd_bread (buf, 4, abfd) != 4)))
1053     goto format_error_free;
1054
1055   section_vma |= (bfd_vma) bfd_get_32 (abfd, buf);
1056
1057   sec = mmo_make_section (abfd, secname);
1058   free (secname);
1059   if (sec == NULL)
1060     goto format_error;
1061
1062   /* We allocate a buffer here for the advertised size, with head room for
1063      tetrabyte alignment.  */
1064   loc = bfd_zmalloc (section_length + 3
1065                      + sizeof (struct mmo_data_list_struct));
1066   if (loc == NULL)
1067     goto format_error;
1068
1069   /* Use a TETRA-rounded size for the allocated buffer; we set the
1070      "visible" section size below.  */
1071   loc->size = (section_length + 3) & ~3;
1072
1073   /* Add in the section flags we found to those bfd entered during this
1074      process and set the contents.  */
1075   if (! bfd_set_section_flags (abfd, sec,
1076                                bfd_sec_flags_from_mmo_flags (flags)
1077                                | bfd_get_section_flags (abfd, sec)
1078                                | (section_length != 0 ? SEC_HAS_CONTENTS : 0))
1079       || ! bfd_set_section_size (abfd, sec, sec->size + section_length)
1080       /* Set VMA only for the first occurrence.  */
1081       || (! sec->user_set_vma
1082           && ! bfd_set_section_vma  (abfd, sec, section_vma)))
1083     {
1084       /* If we get an error for any of the calls above, signal more than
1085          just a format error for the spec section.  */
1086       return NULL;
1087     }
1088
1089   loc->next = NULL;
1090   if (mmo_section_data (sec)->tail != NULL)
1091     mmo_section_data (sec)->tail->next = loc;
1092   else
1093     mmo_section_data (sec)->head = loc;
1094   mmo_section_data (sec)->tail = loc;
1095   loc->where = section_vma;
1096
1097   return sec;
1098
1099  format_error_free:
1100   free (secname);
1101  format_error:
1102   if (bfd_seek (abfd, orig_pos, SEEK_SET) != 0)
1103     return NULL;
1104
1105   return mmo_get_generic_spec_data_section (abfd, spec_data_number);
1106 }
1107
1108 /* Read a byte, but read from file in multiples of 32-bit words.  */
1109
1110 static bfd_byte
1111 mmo_get_byte (bfd *abfd)
1112 {
1113   bfd_byte retval;
1114
1115   if (abfd->tdata.mmo_data->byte_no == 0)
1116     {
1117       if (! abfd->tdata.mmo_data->have_error
1118           && bfd_bread (abfd->tdata.mmo_data->buf, 4, abfd) != 4)
1119         {
1120           abfd->tdata.mmo_data->have_error = TRUE;
1121
1122           /* A value somewhat safe against tripping on some inconsistency
1123              when mopping up after this error.  */
1124           return 128;
1125         }
1126     }
1127
1128   retval = abfd->tdata.mmo_data->buf[abfd->tdata.mmo_data->byte_no];
1129   abfd->tdata.mmo_data->byte_no = (abfd->tdata.mmo_data->byte_no + 1) % 4;
1130
1131   return retval;
1132 }
1133
1134 /* Write a byte, in multiples of 32-bit words.  */
1135
1136 static void
1137 mmo_write_byte (bfd *abfd, bfd_byte value)
1138 {
1139   abfd->tdata.mmo_data->buf[(abfd->tdata.mmo_data->byte_no++ % 4)] = value;
1140   if ((abfd->tdata.mmo_data->byte_no % 4) == 0)
1141     {
1142       if (! abfd->tdata.mmo_data->have_error
1143           && bfd_bwrite (abfd->tdata.mmo_data->buf, 4, abfd) != 4)
1144         abfd->tdata.mmo_data->have_error = TRUE;
1145     }
1146 }
1147
1148 /* Create a symbol.  */
1149
1150 static bfd_boolean
1151 mmo_create_symbol (bfd *abfd, const char *symname, bfd_vma addr, enum
1152                    mmo_sym_type sym_type, unsigned int serno)
1153 {
1154   struct mmo_symbol *n;
1155
1156   n = (struct mmo_symbol *) bfd_alloc (abfd, sizeof (struct mmo_symbol));
1157   if (n == NULL)
1158     return FALSE;
1159
1160   n->name = bfd_alloc (abfd, strlen (symname) + 1);
1161   if (n->name == NULL)
1162     return FALSE;
1163
1164   strcpy (n->name, symname);
1165
1166   n->value = addr;
1167   n->sym_type = sym_type;
1168   n->serno = serno;
1169
1170   if (abfd->tdata.mmo_data->symbols == NULL)
1171     abfd->tdata.mmo_data->symbols = n;
1172   else
1173     abfd->tdata.mmo_data->symtail->next = n;
1174   abfd->tdata.mmo_data->symtail = n;
1175   n->next = NULL;
1176
1177   ++abfd->symcount;
1178
1179   /* Check that :Main equals the last octa of the .MMIX.reg_contents
1180      section, as it's the one place we're sure to pass when reading a mmo
1181      object.  For written objects, we do it while setting the symbol
1182      table.  */
1183   if (strcmp (symname, MMIX_START_SYMBOL_NAME) == 0
1184       && bfd_get_start_address (abfd) != addr)
1185     {
1186       (*_bfd_error_handler)
1187         (_("%s: invalid mmo file: initialization value for $255 is not `Main'\n"),
1188          bfd_get_filename (abfd));
1189       bfd_set_error (bfd_error_bad_value);
1190       return FALSE;
1191     }
1192
1193   return TRUE;
1194 }
1195
1196 /* Read in symbols.  */
1197
1198 static bfd_boolean
1199 mmo_get_symbols (bfd *abfd)
1200 {
1201 /*
1202 INODE
1203 Symbol-table, mmo section mapping, File layout, mmo
1204 SUBSECTION
1205         Symbol table format
1206
1207         From mmixal.w (or really, the generated mmixal.tex) in
1208         @url{http://www-cs-faculty.stanford.edu/~knuth/programs/mmix.tar.gz}):
1209         ``Symbols are stored and retrieved by means of a @samp{ternary
1210         search trie}, following ideas of Bentley and Sedgewick. (See
1211         ACM--SIAM Symp.@: on Discrete Algorithms @samp{8} (1997), 360--369;
1212         R.@:Sedgewick, @samp{Algorithms in C} (Reading, Mass.@:
1213         Addison--Wesley, 1998), @samp{15.4}.)  Each trie node stores a
1214         character, and there are branches to subtries for the cases where
1215         a given character is less than, equal to, or greater than the
1216         character in the trie.  There also is a pointer to a symbol table
1217         entry if a symbol ends at the current node.''
1218
1219         So it's a tree encoded as a stream of bytes.  The stream of bytes
1220         acts on a single virtual global symbol, adding and removing
1221         characters and signalling complete symbol points.  Here, we read
1222         the stream and create symbols at the completion points.
1223
1224         First, there's a control byte <<m>>.  If any of the listed bits
1225         in <<m>> is nonzero, we execute what stands at the right, in
1226         the listed order:
1227
1228 | (MMO3_LEFT)
1229 | 0x40 - Traverse left trie.
1230 |        (Read a new command byte and recurse.)
1231 |
1232 | (MMO3_SYMBITS)
1233 | 0x2f - Read the next byte as a character and store it in the
1234 |        current character position; increment character position.
1235 |        Test the bits of <<m>>:
1236 |
1237 |        (MMO3_WCHAR)
1238 |        0x80 - The character is 16-bit (so read another byte,
1239 |               merge into current character.
1240 |
1241 |        (MMO3_TYPEBITS)
1242 |        0xf  - We have a complete symbol; parse the type, value
1243 |               and serial number and do what should be done
1244 |               with a symbol.  The type and length information
1245 |               is in j = (m & 0xf).
1246 |
1247 |               (MMO3_REGQUAL_BITS)
1248 |               j == 0xf: A register variable.  The following
1249 |                         byte tells which register.
1250 |               j <= 8:   An absolute symbol.  Read j bytes as the
1251 |                         big-endian number the symbol equals.
1252 |                         A j = 2 with two zero bytes denotes an
1253 |                         unknown symbol.
1254 |               j > 8:    As with j <= 8, but add (0x20 << 56)
1255 |                         to the value in the following j - 8
1256 |                         bytes.
1257 |
1258 |               Then comes the serial number, as a variant of
1259 |               uleb128, but better named ubeb128:
1260 |               Read bytes and shift the previous value left 7
1261 |               (multiply by 128).  Add in the new byte, repeat
1262 |               until a byte has bit 7 set.  The serial number
1263 |               is the computed value minus 128.
1264 |
1265 |        (MMO3_MIDDLE)
1266 |        0x20 - Traverse middle trie.  (Read a new command byte
1267 |               and recurse.)  Decrement character position.
1268 |
1269 | (MMO3_RIGHT)
1270 | 0x10 - Traverse right trie.  (Read a new command byte and
1271 |        recurse.)
1272
1273         Let's look again at the <<lop_stab>> for the trivial file
1274         (@pxref{File layout}).
1275
1276 | 0x980b0000 - lop_stab for ":Main" = 0, serial 1.
1277 | 0x203a4040
1278 | 0x10404020
1279 | 0x4d206120
1280 | 0x69016e00
1281 | 0x81000000
1282
1283         This forms the trivial trie (note that the path between ``:'' and
1284         ``M'' is redundant):
1285
1286 | 203a     ":"
1287 | 40       /
1288 | 40      /
1289 | 10      \
1290 | 40      /
1291 | 40     /
1292 | 204d  "M"
1293 | 2061  "a"
1294 | 2069  "i"
1295 | 016e  "n" is the last character in a full symbol, and
1296 |       with a value represented in one byte.
1297 | 00    The value is 0.
1298 | 81    The serial number is 1.  */
1299
1300   bfd_byte m = mmo_get_byte (abfd);
1301
1302   /* Check first if we have a bad hair day.  */
1303   if (abfd->tdata.mmo_data->have_error)
1304     return FALSE;
1305
1306   if (m & MMO3_LEFT)
1307     /* Traverse left trie. */
1308     mmo_get_symbols (abfd);
1309
1310   if (m & MMO3_SYMBITS)
1311     {
1312       bfd_byte c = mmo_get_byte (abfd);
1313       bfd_byte j = m & MMO3_TYPEBITS;
1314       bfd_vma addr = 0;
1315       enum mmo_sym_type sym_type;
1316       unsigned int serno = 0;
1317       bfd_byte k;
1318
1319       if (m & MMO3_WCHAR)
1320         {
1321           bfd_byte c2 = mmo_get_byte (abfd);
1322
1323           /* A two-byte character.  We can't grok this, but neither can
1324              mmotype, for other cases than the second byte being zero.  */
1325
1326           if (c != 0)
1327             {
1328               abfd->tdata.mmo_data->lop_stab_symbol
1329                 [abfd->tdata.mmo_data->symbol_position] = 0;
1330
1331               (*_bfd_error_handler)
1332                 (_("%s: unsupported wide character sequence"
1333                    " 0x%02X 0x%02X after symbol name starting with `%s'\n"),
1334                  bfd_get_filename (abfd), c, c2,
1335                  abfd->tdata.mmo_data->lop_stab_symbol);
1336               bfd_set_error (bfd_error_bad_value);
1337               abfd->tdata.mmo_data->have_error = TRUE;
1338               return FALSE;
1339             }
1340           else
1341             c = c2;
1342         }
1343
1344       abfd->tdata.mmo_data->lop_stab_symbol[abfd->tdata.mmo_data->symbol_position++] = c;
1345       abfd->tdata.mmo_data->lop_stab_symbol[abfd->tdata.mmo_data->symbol_position] = 0;
1346
1347       if (j & MMO3_REGQUAL_BITS)
1348         {
1349           if (j == MMO3_REGQUAL_BITS)
1350             {
1351               sym_type = mmo_reg_sym;
1352               addr = mmo_get_byte (abfd);
1353             }
1354           else if (j <= 8)
1355             {
1356               unsigned int i;
1357
1358               for (i = 0; i < j; i++)
1359                 addr = (addr << 8) + mmo_get_byte (abfd);
1360
1361               if (addr == 0 && j == MMO3_UNDEF)
1362                 sym_type = mmo_undef_sym;
1363               else
1364                 sym_type = mmo_abs_sym;
1365             }
1366           else
1367             {
1368               unsigned int i;
1369
1370               for (i = MMO3_DATA; i < j; i++)
1371                 addr = (addr << 8) + mmo_get_byte (abfd);
1372
1373               addr += (bfd_vma) 0x20 << 56;
1374               sym_type = mmo_data_sym;
1375             }
1376
1377           /* Get the serial number.  */
1378           do
1379             {
1380               k = mmo_get_byte (abfd);
1381               serno = (serno << 7) + k;
1382             }
1383           while (k < 128);
1384           serno -= 128;
1385
1386           /* Got it.  Now enter it.  Skip a leading ":".  */
1387           if (! abfd->tdata.mmo_data->have_error
1388               && ! mmo_create_symbol (abfd,
1389                                       abfd->tdata.mmo_data->lop_stab_symbol
1390                                       + 1,
1391                                       addr, sym_type, serno))
1392             abfd->tdata.mmo_data->have_error = TRUE;
1393         }
1394
1395       if (m & MMO3_MIDDLE)
1396         /* Traverse middle trie. */
1397         mmo_get_symbols (abfd);
1398
1399       abfd->tdata.mmo_data->symbol_position--;
1400     }
1401
1402   if (m & MMO3_RIGHT)
1403     /* Traverse right trie.  */
1404     mmo_get_symbols (abfd);
1405
1406   return ! abfd->tdata.mmo_data->have_error;
1407 }
1408
1409 /* Get the location of memory area [VMA..VMA + SIZE - 1], which we think
1410    is in section SEC.  Adjust and reallocate zero-initialized contents.
1411    If there's new contents, allocate to the next multiple of
1412    MMO_SEC_CONTENTS_CHUNK_SIZE.  */
1413
1414 static INLINE bfd_byte *
1415 mmo_get_loc (asection *sec, bfd_vma vma, int size)
1416 {
1417   bfd_size_type allocated_size;
1418   struct mmo_section_data_struct *sdatap = mmo_section_data (sec);
1419   struct mmo_data_list_struct *datap = sdatap->head;
1420   struct mmo_data_list_struct *entry;
1421
1422   /* First search the list to see if we have the requested chunk in one
1423      piece, or perhaps if we have a suitable chunk with room to fit.  */
1424   for (; datap != NULL; datap = datap->next)
1425     {
1426       if (datap->where <= vma
1427           && datap->where + datap->size >= vma + size)
1428         return datap->data + vma - datap->where;
1429       else if (datap->where <= vma
1430                && datap->where + datap->allocated_size >= vma + size
1431                /* Only munch on the "allocated size" if it does not
1432                   overlap the next chunk.  */
1433                && (datap->next == NULL || datap->next->where >= vma + size))
1434         {
1435           /* There was room allocated, but the size wasn't set to include
1436              it.  Do that now.  */
1437           datap->size += (vma + size) - (datap->where + datap->size);
1438
1439           /* Update the section size.  This happens only if we update the
1440              32-bit-aligned chunk size.  Callers that have
1441              non-32-bit-aligned sections should do all allocation and
1442              size-setting by themselves or at least set the section size
1443              after the last allocating call to this function.  */
1444           if (vma + size > sec->vma + sec->size)
1445             sec->size += (vma + size) - (sec->vma + sec->size);
1446
1447           return datap->data + vma - datap->where;
1448         }
1449     }
1450
1451   /* Not found; allocate a new block.  First check in case we get a
1452      request for a size split up over several blocks; we'll have to return
1453      NULL for those cases, requesting the caller to split up the request.
1454      Requests with an address aligned on MMO_SEC_CONTENTS_CHUNK_SIZE bytes and
1455      for no more than MMO_SEC_CONTENTS_CHUNK_SIZE will always get resolved.  */
1456
1457   for (datap = sdatap->head; datap != NULL; datap = datap->next)
1458     if ((datap->where <= vma && datap->where + datap->size > vma)
1459         || (datap->where < vma + size
1460             && datap->where + datap->size >= vma + size))
1461       return NULL;
1462
1463   allocated_size
1464     = (size + MMO_SEC_CONTENTS_CHUNK_SIZE - 1) & ~(MMO_SEC_CONTENTS_CHUNK_SIZE - 1);
1465   entry = (mmo_data_list_type *)
1466     bfd_zalloc (sec->owner, sizeof (mmo_data_list_type) + allocated_size);
1467   if (entry == NULL)
1468     return NULL;
1469   entry->where = vma;
1470   entry->size = size;
1471   entry->allocated_size = allocated_size;
1472
1473   datap = sdatap->head;
1474
1475   /* Sort the records by address.  Optimize for the common case of adding
1476      a record to the end of the list.  */
1477   if (sdatap->tail != NULL && entry->where >= sdatap->tail->where)
1478     {
1479       sdatap->tail->next = entry;
1480       entry->next = NULL;
1481       sdatap->tail = entry;
1482     }
1483   else
1484     {
1485       mmo_data_list_type **look;
1486       for (look = &sdatap->head;
1487            *look != NULL && (*look)->where < entry->where;
1488            look = &(*look)->next)
1489         ;
1490       entry->next = *look;
1491       *look = entry;
1492       if (entry->next == NULL)
1493         {
1494           sdatap->tail = entry;
1495
1496           /* We get here for the first time (at other times too) for this
1497              section.  Say we have contents.  */
1498           if (! bfd_set_section_flags (sec->owner, sec,
1499                                        bfd_get_section_flags (sec->owner, sec)
1500                                        | SEC_HAS_CONTENTS))
1501             return NULL;
1502         }
1503     }
1504
1505   /* Update the section size.  This happens only when we add contents and
1506      re-size as we go.  The section size will then be aligned to 32 bits.  */
1507   if (vma + size > sec->vma + sec->size)
1508     sec->size += (vma + size) - (sec->vma + sec->size);
1509   return entry->data;
1510 }
1511
1512 /* Set sizes once we've read in all sections.  */
1513
1514 static void
1515 mmo_map_set_sizes (bfd *abfd ATTRIBUTE_UNUSED, asection *sec,
1516                    void *ignored ATTRIBUTE_UNUSED)
1517 {
1518   sec->lma = sec->vma;
1519 }
1520
1521 /* Read the mmo file and turn it into sections.  */
1522
1523 static bfd_boolean
1524 mmo_scan (bfd *abfd)
1525 {
1526   unsigned int i;
1527   unsigned int lineno = 1;
1528   bfd_boolean error = FALSE;
1529   bfd_vma vma = 0;
1530   asection *sec = bfd_make_section_old_way (abfd, MMO_TEXT_SECTION_NAME);
1531   asection *non_spec_sec = NULL;
1532   bfd_vma non_spec_vma = 0;
1533   char *current_filename = NULL;
1534   bfd_size_type nbytes_read = 0;
1535   /* Buffer with room to read a 64-bit value.  */
1536   bfd_byte buf[8];
1537   long stab_loc = -1;
1538   char *file_names[256];
1539
1540   memset (file_names, 0, sizeof (file_names));
1541
1542   if (bfd_seek (abfd, (file_ptr) 0, SEEK_SET) != 0)
1543     goto error_return;
1544
1545   while ((nbytes_read = bfd_bread (buf, 4, abfd)) == 4)
1546     {
1547       if (buf[0] == LOP)
1548         {
1549           unsigned int y = bfd_get_8 (abfd, buf + 2);
1550           unsigned int z = bfd_get_8 (abfd, buf + 3);
1551
1552           /* Change back to the original section for lopcodes other
1553              than LOP_QUOTE that comes after a LOP_SPEC.  */
1554           if ((buf[1] != LOP_QUOTE || y != 0 || z != 1)
1555               && non_spec_sec != NULL)
1556             {
1557               sec = non_spec_sec;
1558               vma = non_spec_vma;
1559               non_spec_sec = NULL;
1560             }
1561
1562           switch (buf[1])
1563             {
1564             default:
1565               (*_bfd_error_handler)
1566                 (_("%s: invalid mmo file: unsupported lopcode `%d'\n"),
1567                  bfd_get_filename (abfd), buf[1]);
1568               bfd_set_error (bfd_error_bad_value);
1569               goto error_return;
1570
1571             case LOP_QUOTE:
1572               /* Quote the next 32-bit word.  */
1573               if (y != 0 || z != 1)
1574                 {
1575                   (*_bfd_error_handler)
1576                     (_("%s: invalid mmo file: expected YZ = 1 got YZ = %d for lop_quote\n"),
1577                      bfd_get_filename (abfd), y*256+z);
1578                   bfd_set_error (bfd_error_bad_value);
1579                   goto error_return;
1580                 }
1581               if (bfd_bread (buf, 4, abfd) != 4)
1582                 goto error_return;
1583
1584               mmo_xore_32 (sec, vma, bfd_get_32 (abfd, buf));
1585               vma += 4;
1586               vma &= ~3;
1587               lineno++;
1588               break;
1589
1590             case LOP_LOC:
1591               /* Set vma (and section).  */
1592               vma = (bfd_vma) y << 56;
1593               if (z == 1)
1594                 {
1595                   /* Get a 32-bit value.  */
1596                   if (bfd_bread (buf, 4, abfd) != 4)
1597                     goto error_return;
1598
1599                   vma += bfd_get_32 (abfd, buf);
1600                 }
1601               else if (z == 2)
1602                 {
1603                   /* Get a 64-bit value.  */
1604                   if (bfd_bread (buf, 8, abfd) != 8)
1605                     goto error_return;
1606
1607                   vma += bfd_get_64 (abfd, buf);
1608                 }
1609               else
1610                 {
1611                   (*_bfd_error_handler)
1612                     (_("%s: invalid mmo file: expected z = 1 or z = 2, got z = %d for lop_loc\n"),
1613                      bfd_get_filename (abfd), z);
1614                   bfd_set_error (bfd_error_bad_value);
1615                   goto error_return;
1616                 }
1617
1618               sec = mmo_decide_section (abfd, vma);
1619               if (sec == NULL)
1620                 goto error_return;
1621               break;
1622
1623             case LOP_SKIP:
1624               /* Move forward within the same section.  */
1625               vma += y * 256 + z;
1626
1627               sec = mmo_decide_section (abfd, vma);
1628               if (sec == NULL)
1629                 goto error_return;
1630               break;
1631
1632             case LOP_FIXO:
1633               /* A fixup: Store the current vma somewhere.  Position using
1634                  same format as LOP_LOC.  */
1635               {
1636                 bfd_vma p = (bfd_vma) y << 56;
1637                 asection *fixosec;
1638
1639                 if (z == 1)
1640                   {
1641                     /* Get a 32-bit value.  */
1642                     if (bfd_bread (buf, 4, abfd) != 4)
1643                       goto error_return;
1644
1645                     p += bfd_get_32 (abfd, buf);
1646                   }
1647                 else if (z == 2)
1648                   {
1649                     /* Get a 64-bit value.  */
1650                     if (bfd_bread (buf, 8, abfd) != 8)
1651                       goto error_return;
1652
1653                     p += bfd_get_64 (abfd, buf);
1654                   }
1655                 else
1656                   {
1657                     (*_bfd_error_handler)
1658                       (_("%s: invalid mmo file: expected z = 1 or z = 2, got z = %d for lop_fixo\n"),
1659                        bfd_get_filename (abfd), z);
1660                     bfd_set_error (bfd_error_bad_value);
1661                     goto error_return;
1662                   }
1663
1664                 /* The section where we store this address might be a
1665                    different one than the current section.  */
1666                 fixosec = mmo_decide_section (abfd, p);
1667                 if (fixosec == NULL)
1668                   goto error_return;
1669                 mmo_xore_64 (fixosec, p, vma);
1670               }
1671             break;
1672
1673             case LOP_FIXR:
1674               /* A fixup: Store YZ of this lopcode into YZ at vma - 4 * yz.  */
1675               {
1676                 unsigned int yz = (y * 256 + z);
1677                 bfd_vma p = vma + 2 - 4 * yz;
1678                 asection *fixrsec = mmo_decide_section (abfd, p);
1679                 if (fixrsec == NULL)
1680                   goto error_return;
1681                 mmo_xore_16 (fixrsec, p, yz);
1682               }
1683             break;
1684
1685             case LOP_FIXRX:
1686               /* A fixup, similar to lop_fixr, but taking larger numbers
1687                  and can change branches into the opposite direction
1688                  (gasp!).  */
1689               {
1690                 bfd_vma delta;
1691                 bfd_vma p;
1692                 asection *fixrsec;
1693
1694                 if (y != 0)
1695                   {
1696                     (*_bfd_error_handler)
1697                       (_("%s: invalid mmo file: expected y = 0, got y = %d for lop_fixrx\n"),
1698                        bfd_get_filename (abfd), y);
1699                     bfd_set_error (bfd_error_bad_value);
1700                     goto error_return;
1701                   }
1702
1703                 if (z != 16 && z != 24)
1704                   {
1705                     (*_bfd_error_handler)
1706                       (_("%s: invalid mmo file: expected z = 16 or z = 24, got z = %d for lop_fixrx\n"),
1707                        bfd_get_filename (abfd), z);
1708                     bfd_set_error (bfd_error_bad_value);
1709                     goto error_return;
1710                   }
1711
1712                 /* Get the next 32-bit value.  */
1713                 if (bfd_bread (buf, 4, abfd) != 4)
1714                   goto error_return;
1715
1716                 delta = bfd_get_32 (abfd, buf);
1717
1718                 /* Do an, ehm, involved calculation for the location of
1719                    the fixup.  See mmixal documentation for a verbose
1720                    explanation.  We follow it verbosely here for the
1721                    readers delight.  */
1722                 if (buf[0] == 0)
1723                   p = vma - 4 * delta;
1724                 else if (buf[0] == 1)
1725                   p = vma - 4 * ((delta & 0xffffff) - (1 << z));
1726                 else
1727                   {
1728                     (*_bfd_error_handler)
1729                       (_("%s: invalid mmo file: leading byte of operand word must be 0 or 1, got %d for lop_fixrx\n"),
1730                        bfd_get_filename (abfd), buf[0]);
1731                     bfd_set_error (bfd_error_bad_value);
1732                     goto error_return;
1733                   }
1734
1735                 fixrsec = mmo_decide_section (abfd, vma);
1736                 if (fixrsec == NULL)
1737                   goto error_return;
1738                 mmo_xore_32 (fixrsec, p, delta);
1739               }
1740             break;
1741
1742             case LOP_FILE:
1743               /* Set current file and perhaps the file name.  Reset line
1744                  number.  */
1745               if (z != 0)
1746                 {
1747                   char *fname = bfd_malloc (z * 4 + 1);
1748
1749                   if (fname == NULL)
1750                     {
1751                       (*_bfd_error_handler)
1752                         (_("%s: cannot allocate file name for file number %d, %d bytes\n"),
1753                          bfd_get_filename (abfd), y, z * 4 + 1);
1754                       bfd_set_error (bfd_error_system_call);
1755                       goto error_return;
1756                     }
1757
1758                   fname[z * 4] = 0;
1759
1760                   for (i = 0; i < z; i++)
1761                     {
1762                       if (bfd_bread (fname + i * 4, 4, abfd) != 4)
1763                         {
1764                           free (fname);
1765                           goto error_return;
1766                         }
1767                     }
1768
1769                   if (file_names[y] != NULL)
1770                     {
1771                       (*_bfd_error_handler)
1772                         (_("%s: invalid mmo file: file number %d `%s',"
1773                            " was already entered as `%s'\n"),
1774                          bfd_get_filename (abfd), y, fname, file_names[y]);
1775                       bfd_set_error (bfd_error_bad_value);
1776                       goto error_return;
1777                     }
1778
1779                   file_names[y] = fname;
1780                 }
1781
1782               if (file_names[y] == NULL)
1783                 {
1784                   (*_bfd_error_handler)
1785                     (_("%s: invalid mmo file: file name for number %d"
1786                        " was not specified before use\n"),
1787                      bfd_get_filename (abfd), y);
1788                   bfd_set_error (bfd_error_bad_value);
1789                   goto error_return;
1790                 }
1791
1792               current_filename = file_names[y];
1793               lineno = 0;
1794               break;
1795
1796             case LOP_LINE:
1797               /* Set line number.  */
1798               lineno = y * 256 + z;
1799               /* FIXME: Create a sequence of mmo-specific line number
1800                  entries for each section, then translate into canonical
1801                  format.  */
1802               break;
1803
1804             case LOP_SPEC:
1805               /* Special data follows until the next non-lop_quote
1806                  lopcode.  */
1807               non_spec_sec = sec;
1808               non_spec_vma = vma;
1809               sec = mmo_get_spec_section (abfd, y * 256 + z);
1810               if (sec == NULL)
1811                 goto error_return;
1812
1813               vma = sec->vma;
1814               break;
1815
1816             case LOP_PRE:
1817               {
1818                 /* We ignore header information, except we read in the
1819                    creation time from the first 32-bit word with the time
1820                    in seconds since era.  */
1821                 if (z >= 1
1822                     && bfd_bread (abfd->tdata.mmo_data->created, 4,
1823                                  abfd) != 4)
1824                   goto error_return;
1825
1826                 for (i = 1; i < z; i++)
1827                   if (bfd_bread (buf, 4, abfd) != 4)
1828                     goto error_return;
1829               }
1830               break;
1831
1832             case LOP_POST:
1833               /* This tells of the contents of registers $Z..$255 at
1834                  startup.  We make a section out of it, with VMA = Z * 8,
1835                  but only if Z != 255 or the contents is non-zero.  */
1836               {
1837                 asection *rsec;
1838                 bfd_byte *loc;
1839                 bfd_vma first_octa;
1840                 bfd_vma startaddr_octa;
1841
1842                 /* Read first octaword outside loop to simplify logic when
1843                    excluding the Z == 255, octa == 0 case.  */
1844                 if (bfd_bread (buf, 8, abfd) != 8)
1845                   goto error_return;
1846
1847                 first_octa = bfd_get_64 (abfd, buf);
1848
1849                 /* Don't emit contents for the trivial case which is
1850                    always present; $255 pointing to Main.  */
1851                 if (z != 255)
1852                   {
1853                     rsec
1854                       = bfd_make_section_old_way (abfd,
1855                                                   MMIX_REG_CONTENTS_SECTION_NAME);
1856                     rsec->flags |= SEC_LINKER_CREATED;
1857                     rsec->vma = z * 8;
1858                     loc = mmo_get_loc (rsec, z * 8, (255 - z) * 8);
1859                     bfd_put_64 (abfd, first_octa, loc);
1860
1861                     for (i = z + 1; i < 255; i++)
1862                       {
1863                         if (bfd_bread (loc + (i - z) * 8, 8, abfd) != 8)
1864                           goto error_return;
1865                       }
1866
1867                     /* Read out the last octabyte, and use it to set the
1868                        start address.  */
1869                     if (bfd_bread (buf, 8, abfd) != 8)
1870                       goto error_return;
1871
1872                     startaddr_octa = bfd_get_64 (abfd, buf);
1873                   }
1874                 else
1875                   startaddr_octa = first_octa;
1876
1877                 if (! bfd_set_start_address (abfd, startaddr_octa))
1878                   {
1879                     /* Currently this can't fail, but this should handle
1880                        future failures.  */
1881                     bfd_set_error (bfd_error_bad_value);
1882                     goto error_return;
1883                   }
1884               }
1885               break;
1886
1887             case LOP_STAB:
1888               /* We read in the symbols now, not later.  */
1889               if (y != 0 || z != 0)
1890                 {
1891                   (*_bfd_error_handler)
1892                     (_("%s: invalid mmo file: fields y and z of lop_stab"
1893                        " non-zero, y: %d, z: %d\n"),
1894                      bfd_get_filename (abfd), y, z);
1895                   bfd_set_error (bfd_error_bad_value);
1896                   goto error_return;
1897                 }
1898
1899               /* Save the location, so we can check that YZ in the LOP_END
1900                  is correct.  */
1901               stab_loc = bfd_tell (abfd);
1902
1903               /* It's not said that an MMO can be without symbols (though
1904                  mmixal will refuse to assemble files without Main), but
1905                  it seems it would still be a valid mmo-file, so allow it.
1906                  We detect the absence of a symbol area in that the upper
1907                  limit is computed (from the lop_end YZ field) as 0.
1908                  Don't call mmo_get_symbols; it can only detect the end of
1909                  a valid symbol trie, not the absence of one.  */
1910               if (abfd->tdata.mmo_data->max_symbol_length != 0
1911                   && ! mmo_get_symbols (abfd))
1912                 goto error_return;
1913               break;
1914
1915             case LOP_END:
1916               {
1917                 /* This must be the last 32-bit word in an mmo file.
1918                    Let's find out.  */
1919                 struct stat statbuf;
1920                 file_ptr curpos = bfd_tell (abfd);
1921
1922                 if (bfd_stat (abfd, &statbuf) < 0)
1923                   goto error_return;
1924
1925                 if (statbuf.st_size != curpos)
1926                   {
1927                     (*_bfd_error_handler)
1928                       (_("%s: invalid mmo file: lop_end not last item in"
1929                          " file\n"),
1930                        bfd_get_filename (abfd));
1931                     bfd_set_error (bfd_error_bad_value);
1932                     goto error_return;
1933                   }
1934
1935                 /* Check that the YZ field is right.  Subtract the size of
1936                    this LOP_END in the calculation; YZ does not include
1937                    it.  */
1938                 if ((long) (y * 256 + z) * 4 != (curpos - stab_loc) - 4)
1939                   {
1940                     (*_bfd_error_handler)
1941                       (_("%s: invalid mmo file: YZ of lop_end (%ld)"
1942                          " not equal to the number of tetras to the preceding"
1943                          " lop_stab (%ld)\n"),
1944                        bfd_get_filename (abfd), (long) (y * 256 + z),
1945                        (curpos - stab_loc - 4)/4);
1946                     bfd_set_error (bfd_error_bad_value);
1947                     goto error_return;
1948                   }
1949
1950                 bfd_map_over_sections (abfd, mmo_map_set_sizes, NULL);
1951                 goto done;
1952               }
1953             }
1954         }
1955       else
1956         {
1957           /* This wasn't a lopcode, so store it in the current section.  */
1958           mmo_xore_32 (sec, vma & ~3, bfd_get_32 (abfd, buf));
1959           vma += 4;
1960           vma &= ~3;
1961           lineno++;
1962         }
1963     }
1964
1965   /* We know this file is a multiple of four bytes (checked in
1966      mmo_object_p), so if we got something other than 0, this was a bad
1967      file (although it's more likely we'll get 0 in that case too).
1968      If we got end-of-file, then there was no lop_stab, so the file has
1969      invalid format.  */
1970
1971   if (nbytes_read != 0)
1972     bfd_set_error (bfd_error_system_call);
1973   else
1974     bfd_set_error (bfd_error_bad_value);
1975
1976  error_return:
1977   error = TRUE;
1978  done:
1979   /* Mark the .text and .data section with their normal attribute if they
1980      contain anything.  This is not redundant wrt. mmo_decide_section,
1981      since that code might never execute, and conversely the alloc+code
1982      section flags must be set then.  */
1983   sec = bfd_get_section_by_name (abfd, MMO_TEXT_SECTION_NAME);
1984   if (sec != NULL
1985       && (bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS)
1986       && ! bfd_set_section_flags (abfd, sec,
1987                                   bfd_get_section_flags (abfd, sec)
1988                                   | SEC_ALLOC | SEC_LOAD | SEC_CODE))
1989     error = TRUE;
1990
1991   sec = bfd_get_section_by_name (abfd, MMO_DATA_SECTION_NAME);
1992   if (sec != NULL
1993       && (bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS)
1994       && ! bfd_set_section_flags (abfd, sec,
1995                                   bfd_get_section_flags (abfd, sec)
1996                                   | SEC_ALLOC | SEC_LOAD))
1997     error = TRUE;
1998
1999   /* Free whatever resources we took.  */
2000   for (i = 0; i < sizeof (file_names) / sizeof (file_names[0]); i++)
2001     if (file_names[i])
2002       free (file_names[i]);
2003   return ! error;
2004 }
2005
2006 /* A hook to set up object file dependent section information.  For mmo,
2007    we point out the shape of allocated section contents.  */
2008
2009 static bfd_boolean
2010 mmo_new_section_hook (bfd *abfd, asection *newsect)
2011 {
2012   if (!newsect->used_by_bfd)
2013     {
2014       /* We zero-fill all fields and assume NULL is represented by an all
2015          zero-bit pattern.  */
2016       newsect->used_by_bfd
2017         = bfd_zalloc (abfd, sizeof (struct mmo_section_data_struct));
2018       if (!newsect->used_by_bfd)
2019         return FALSE;
2020     }
2021
2022   /* Always align to at least 32-bit words.  */
2023   newsect->alignment_power = 2;
2024   return _bfd_generic_new_section_hook (abfd, newsect);
2025 }
2026
2027 /* We already have section contents loaded for sections that have
2028    contents.  */
2029
2030 static bfd_boolean
2031 mmo_get_section_contents (bfd *abfd ATTRIBUTE_UNUSED,
2032                           asection *sec,
2033                           void * location,
2034                           file_ptr offset,
2035                           bfd_size_type bytes_to_do)
2036 {
2037   /* Iterate over diminishing chunk sizes, copying contents, like
2038      mmo_set_section_contents.  */
2039   while (bytes_to_do)
2040     {
2041       /* A minor song-and-dance to make sure we're not bitten by the
2042          distant possibility of the cast from bfd_vma to int making the
2043          chunk zero-sized.  */
2044       int chunk_size
2045         = (int) bytes_to_do != 0 ? bytes_to_do : MMO_SEC_CONTENTS_CHUNK_SIZE;
2046       bfd_byte *loc;
2047
2048       do
2049         loc = mmo_get_loc (sec, sec->vma + offset, chunk_size);
2050       while (loc == NULL && (chunk_size /= 2) != 0);
2051
2052       if (chunk_size == 0)
2053         return FALSE;
2054
2055       memcpy (location, loc, chunk_size);
2056
2057       location += chunk_size;
2058       bytes_to_do -= chunk_size;
2059       offset += chunk_size;
2060     }
2061   return TRUE;
2062 }
2063
2064 /* Return the amount of memory needed to read the symbol table.  */
2065
2066 static long
2067 mmo_get_symtab_upper_bound (bfd *abfd)
2068 {
2069   return (abfd->symcount + 1) * sizeof (asymbol *);
2070 }
2071
2072 /* Sort mmo symbols by serial number.  */
2073
2074 static int
2075 mmo_sort_mmo_symbols (const void *arg1, const void *arg2)
2076 {
2077   const struct mmo_symbol *sym1 = *(const struct mmo_symbol **) arg1;
2078   const struct mmo_symbol *sym2 = *(const struct mmo_symbol **) arg2;
2079
2080   /* Sort by serial number first.  */
2081   if (sym1->serno < sym2->serno)
2082     return -1;
2083   else if (sym1->serno > sym2->serno)
2084     return 1;
2085
2086   /* Then sort by address of the table entries.  */
2087   return ((const char *) arg1 - (const char *) arg2);
2088 }
2089
2090 /* Translate the symbol table.  */
2091
2092 static long
2093 mmo_canonicalize_symtab (bfd *abfd, asymbol **alocation)
2094 {
2095   unsigned int symcount = bfd_get_symcount (abfd);
2096   asymbol *csymbols;
2097   unsigned int i;
2098
2099   csymbols = abfd->tdata.mmo_data->csymbols;
2100   if (csymbols == NULL)
2101     {
2102       asymbol *c;
2103       struct mmo_symbol *s;
2104       struct mmo_symbol **msp;
2105
2106       /* First we store the symbols into the table we'll return, then we
2107          qsort it on the serial number, with secondary on the address of
2108          the symbol, to preserve order if there would be non-unique serial
2109          numbers.  */
2110       for (s = abfd->tdata.mmo_data->symbols,
2111              msp = (struct mmo_symbol **) alocation;
2112            s != NULL;
2113            s = s->next, ++msp)
2114         *msp = s;
2115
2116       *msp = NULL;
2117
2118       qsort (alocation, symcount, sizeof (struct mmo_symbol *),
2119              mmo_sort_mmo_symbols);
2120
2121       csymbols = (asymbol *) bfd_alloc (abfd, symcount * sizeof (asymbol));
2122       if (csymbols == NULL && symcount != 0)
2123         return FALSE;
2124       abfd->tdata.mmo_data->csymbols = csymbols;
2125
2126       for (msp = (struct mmo_symbol **) alocation, c = csymbols;
2127            *msp != NULL;
2128            msp++, ++c)
2129         {
2130           s = *msp;
2131           c->the_bfd = abfd;
2132           c->name = s->name;
2133           c->value = s->value;
2134           c->flags = BSF_GLOBAL;
2135
2136           if (s->sym_type == mmo_data_sym)
2137             {
2138               c->section
2139                 = bfd_get_section_by_name (abfd, MMO_DATA_SECTION_NAME);
2140
2141               if (c->section == NULL)
2142                 c->section = bfd_abs_section_ptr;
2143               else
2144                 c->value -= c->section->vma;
2145             }
2146           else if (s->sym_type == mmo_undef_sym)
2147             c->section = bfd_und_section_ptr;
2148           else if (s->sym_type == mmo_reg_sym)
2149             {
2150               c->section
2151                 = bfd_make_section_old_way (abfd, MMIX_REG_SECTION_NAME);
2152               c->section->flags |= SEC_LINKER_CREATED;
2153             }
2154           else
2155             {
2156               asection *textsec
2157                 = bfd_get_section_by_name (abfd, MMO_TEXT_SECTION_NAME);
2158               asection *datasec;
2159
2160               if (textsec != NULL
2161                   && c->value >= textsec->vma
2162                   && c->value <= textsec->vma + textsec->size)
2163                 {
2164                   c->section = textsec;
2165                   c->value -= c->section->vma;
2166                 }
2167               /* In mmo, symbol types depend on the VMA.  Therefore, if
2168                  the data section isn't within the usual bounds, its
2169                  symbols are marked as absolute.  Correct that.  This
2170                  means we can't have absolute symbols with values matching
2171                  data section addresses, but we also can't have with
2172                  absolute symbols with values matching text section
2173                  addresses.  For such needs, use the ELF format.  */
2174               else if ((datasec
2175                         = bfd_get_section_by_name (abfd,
2176                                                    MMO_DATA_SECTION_NAME))
2177                        != NULL
2178                        && c->value >= datasec->vma
2179                        && c->value <= datasec->vma + datasec->size)
2180                 {
2181                   c->section = datasec;
2182                   c->value -= c->section->vma;
2183                 }
2184               else
2185                 c->section = bfd_abs_section_ptr;
2186             }
2187
2188           c->udata.p = NULL;
2189         }
2190     }
2191
2192   /* Last, overwrite the incoming table with the right-type entries.  */
2193   for (i = 0; i < symcount; i++)
2194     *alocation++ = csymbols++;
2195   *alocation = NULL;
2196
2197   return symcount;
2198 }
2199
2200 /* Get information about a symbol.  */
2201
2202 static void
2203 mmo_get_symbol_info (bfd *ignore_abfd ATTRIBUTE_UNUSED,
2204                      asymbol *symbol, symbol_info *ret)
2205 {
2206   bfd_symbol_info (symbol, ret);
2207 }
2208
2209 static void
2210 mmo_print_symbol (bfd *abfd, void *afile, asymbol *symbol,
2211                   bfd_print_symbol_type how)
2212 {
2213   FILE *file = (FILE *) afile;
2214
2215   switch (how)
2216     {
2217     case bfd_print_symbol_name:
2218       fprintf (file, "%s", symbol->name);
2219       break;
2220     default:
2221       bfd_print_symbol_vandf (abfd, file, symbol);
2222
2223       fprintf (file, " %-5s %s",
2224                symbol->section->name,
2225                symbol->name);
2226     }
2227 }
2228
2229 /* We can't map a file directly into executable code, so the
2230    size of header information is irrelevant.  */
2231
2232 static int
2233 mmo_sizeof_headers (bfd *abfd ATTRIBUTE_UNUSED,
2234                     struct bfd_link_info *info ATTRIBUTE_UNUSED)
2235 {
2236   return 0;
2237 }
2238
2239 /* Write the (section-neutral) file preamble.  */
2240
2241 static bfd_boolean
2242 mmo_internal_write_header (bfd *abfd)
2243 {
2244   const char lop_pre_bfd[] = { LOP, LOP_PRE, 1, 1};
2245
2246   if (bfd_bwrite (lop_pre_bfd, 4, abfd) != 4)
2247     return FALSE;
2248
2249   /* Copy creation time of original file.  */
2250   if (bfd_bwrite (abfd->tdata.mmo_data->created, 4, abfd) != 4)
2251     return FALSE;
2252
2253   return TRUE;
2254 }
2255
2256 /* Write the LOP_POST record, with global register initializations.
2257    Z is the Z field of the LOP_POST, corresponding to 255 - number of
2258    registers at DATA.  The Z = 255 field is filled in with the
2259    start-address.  */
2260
2261 static bfd_boolean
2262 mmo_internal_write_post (bfd *abfd, int z, asection *sec)
2263 {
2264   int i;
2265   bfd_byte buf[8];
2266   mmo_write_tetra_raw (abfd, (LOP << 24) | (LOP_POST << 16) | z);
2267
2268   for (i = z; i < 255; i++)
2269     {
2270       bfd_byte *data = mmo_get_loc (sec, i * 8, 8);
2271
2272       if (bfd_bwrite (data, 8, abfd) != 8)
2273         return FALSE;
2274     }
2275
2276   /* For Z == $255, we always emit the start location; supposedly Main,
2277      but we have it handy at bfd_get_start_address.  If we're called with
2278      Z == 255, don't assume DATA is valid.  */
2279   bfd_put_64 (abfd, bfd_get_start_address (abfd), buf);
2280
2281   return ! abfd->tdata.mmo_data->have_error && bfd_bwrite (buf, 8, abfd) == 8;
2282 }
2283
2284 /* Translate to and from BFD flags.  This is to make sure that we don't
2285    get bitten by BFD flag number changes.  */
2286
2287 static flagword
2288 mmo_sec_flags_from_bfd_flags (flagword flags)
2289 {
2290   flagword oflags = 0;
2291
2292   if (flags & SEC_ALLOC)
2293     oflags |= MMO_SEC_ALLOC;
2294   if (flags & SEC_LOAD)
2295     oflags |= MMO_SEC_LOAD;
2296   if (flags & SEC_RELOC)
2297     oflags |= MMO_SEC_RELOC;
2298   if (flags & SEC_READONLY)
2299     oflags |= MMO_SEC_READONLY;
2300   if (flags & SEC_CODE)
2301     oflags |= MMO_SEC_CODE;
2302   if (flags & SEC_DATA)
2303     oflags |= MMO_SEC_DATA;
2304   if (flags & SEC_NEVER_LOAD)
2305     oflags |= MMO_SEC_NEVER_LOAD;
2306   if (flags & SEC_IS_COMMON)
2307     oflags |= MMO_SEC_IS_COMMON;
2308   if (flags & SEC_DEBUGGING)
2309     oflags |= MMO_SEC_DEBUGGING;
2310
2311   return oflags;
2312 }
2313
2314 static flagword
2315 bfd_sec_flags_from_mmo_flags (flagword flags)
2316 {
2317   flagword oflags = 0;
2318
2319   if (flags & MMO_SEC_ALLOC)
2320     oflags |= SEC_ALLOC;
2321   if (flags & MMO_SEC_LOAD)
2322     oflags |= SEC_LOAD;
2323   if (flags & MMO_SEC_RELOC)
2324     oflags |= SEC_RELOC;
2325   if (flags & MMO_SEC_READONLY)
2326     oflags |= SEC_READONLY;
2327   if (flags & MMO_SEC_CODE)
2328     oflags |= SEC_CODE;
2329   if (flags & MMO_SEC_DATA)
2330     oflags |= SEC_DATA;
2331   if (flags & MMO_SEC_NEVER_LOAD)
2332     oflags |= SEC_NEVER_LOAD;
2333   if (flags & MMO_SEC_IS_COMMON)
2334     oflags |= SEC_IS_COMMON;
2335   if (flags & MMO_SEC_DEBUGGING)
2336     oflags |= SEC_DEBUGGING;
2337
2338   return oflags;
2339 }
2340
2341 /* Return TRUE iff the leading or trailing tetrabyte in SEC is defined and
2342    is 0.  */
2343
2344 static bfd_boolean
2345 mmo_has_leading_or_trailing_zero_tetra_p (bfd *abfd, asection *sec)
2346 {
2347   bfd_vma secaddr = bfd_get_section_vma (abfd, sec);
2348
2349   if (sec->size < 4)
2350     return FALSE;
2351
2352   if (bfd_get_32 (abfd, mmo_get_loc (sec, secaddr, 4)) == 0
2353       && bfd_get_32 (abfd,
2354                      mmo_get_loc (sec, secaddr + sec->size - 4, 4)) == 0)
2355     return TRUE;
2356
2357   return FALSE;
2358 }
2359
2360 /* Write a section.  */
2361
2362 static bfd_boolean
2363 mmo_internal_write_section (bfd *abfd, asection *sec)
2364 {
2365   /* We do it differently depending on what section this is:
2366
2367    ".text": Output, prepended by information about the first source file
2368    (not yet implemented.)
2369
2370    ".data": Output.
2371
2372    (".MMIX.reg_contents": Not handled here.)
2373
2374    Anything else: Output inside a lop_spec 80, in the format described
2375    above.  */
2376
2377   if (strcmp (sec->name, MMO_TEXT_SECTION_NAME) == 0)
2378     {
2379       bfd_vma secaddr = bfd_get_section_vma (abfd, sec);
2380
2381       /* Because leading and trailing zeros are omitted in output, we need to
2382          specify the section boundaries so they're correct when the file
2383          is read in again.  That's also the case if this section is
2384          specified as not within its usual boundaries or alignments.  */
2385       if (sec->size != 0
2386           && (secaddr + sec->size >= (bfd_vma) 1 << 56
2387               || (secaddr & 3) != 0
2388               || (sec->size & 3) != 0
2389               || mmo_has_leading_or_trailing_zero_tetra_p (abfd, sec)))
2390         {
2391           if (!mmo_write_section_description (abfd, sec))
2392             return FALSE;
2393         }
2394
2395       /* FIXME: Output source file name and line number.  */
2396       return mmo_write_loc_chunk_list (abfd, mmo_section_data (sec)->head);
2397     }
2398   else if (strcmp (sec->name, MMO_DATA_SECTION_NAME) == 0)
2399     {
2400       bfd_vma secaddr = bfd_get_section_vma (abfd, sec);
2401
2402       /* Same goes as for MMO_TEXT_SECTION_NAME above.  */
2403       if (sec->size != 0
2404           && (secaddr < (bfd_vma) 0x20 << 56
2405               || secaddr + sec->size >= (bfd_vma) 0x21 << 56
2406               || (secaddr & 3) != 0
2407               || (sec->size & 3) != 0
2408               || mmo_has_leading_or_trailing_zero_tetra_p (abfd, sec)))
2409         {
2410           if (!mmo_write_section_description (abfd, sec))
2411             return FALSE;
2412         }
2413
2414       return mmo_write_loc_chunk_list (abfd, mmo_section_data (sec)->head);
2415     }
2416   else if (strcmp (sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0)
2417     /* Not handled here.  */
2418     {
2419       /* This would normally be an abort call since this can't happen, but
2420          we don't do that.  */
2421       bfd_set_error (bfd_error_bad_value);
2422       return FALSE;
2423     }
2424   else if (CONST_STRNEQ (sec->name, MMIX_OTHER_SPEC_SECTION_PREFIX))
2425     {
2426       int n = atoi (sec->name + strlen (MMIX_OTHER_SPEC_SECTION_PREFIX));
2427
2428       mmo_write_tetra_raw (abfd, (LOP << 24) | (LOP_SPEC << 16) | n);
2429       return (! abfd->tdata.mmo_data->have_error
2430               && mmo_write_chunk_list (abfd, mmo_section_data (sec)->head));
2431     }
2432   /* Ignore sections that are just allocated or empty; we write out
2433      _contents_ here.  */
2434   else if ((bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS) != 0
2435            && sec->size != 0)
2436     {
2437       if (!mmo_write_section_description (abfd, sec))
2438         return FALSE;
2439
2440       /* Writing a LOP_LOC ends the LOP_SPEC data, and makes data actually
2441          loaded.  */
2442       if (bfd_get_section_flags (abfd, sec) & SEC_LOAD)
2443         return (! abfd->tdata.mmo_data->have_error
2444                 && mmo_write_loc_chunk_list (abfd,
2445                                          mmo_section_data (sec)->head));
2446       return (! abfd->tdata.mmo_data->have_error
2447               && mmo_write_chunk_list (abfd, mmo_section_data (sec)->head));
2448     }
2449
2450   /* Some section without contents.  */
2451   return TRUE;
2452 }
2453
2454 /* Write the description of a section, extended-mmo-style.  */
2455
2456 static bfd_boolean
2457 mmo_write_section_description (bfd *abfd, asection *sec)
2458 {
2459   /* Keep the following document-comment formatted the way it is.  */
2460 /*
2461 INODE
2462 mmo section mapping, , Symbol-table, mmo
2463 SUBSECTION
2464         mmo section mapping
2465
2466         The implementation in BFD uses special data type 80 (decimal) to
2467         encapsulate and describe named sections, containing e.g.@: debug
2468         information.  If needed, any datum in the encapsulation will be
2469         quoted using lop_quote.  First comes a 32-bit word holding the
2470         number of 32-bit words containing the zero-terminated zero-padded
2471         segment name.  After the name there's a 32-bit word holding flags
2472         describing the section type.  Then comes a 64-bit big-endian word
2473         with the section length (in bytes), then another with the section
2474         start address.  Depending on the type of section, the contents
2475         might follow, zero-padded to 32-bit boundary.  For a loadable
2476         section (such as data or code), the contents might follow at some
2477         later point, not necessarily immediately, as a lop_loc with the
2478         same start address as in the section description, followed by the
2479         contents.  This in effect forms a descriptor that must be emitted
2480         before the actual contents.  Sections described this way must not
2481         overlap.
2482
2483         For areas that don't have such descriptors, synthetic sections are
2484         formed by BFD.  Consecutive contents in the two memory areas
2485         @samp{0x0000@dots{}00} to @samp{0x01ff@dots{}ff} and
2486         @samp{0x2000@dots{}00} to @samp{0x20ff@dots{}ff} are entered in
2487         sections named <<.text>> and <<.data>> respectively.  If an area
2488         is not otherwise described, but would together with a neighboring
2489         lower area be less than @samp{0x40000000} bytes long, it is joined
2490         with the lower area and the gap is zero-filled.  For other cases,
2491         a new section is formed, named <<.MMIX.sec.@var{n}>>.  Here,
2492         @var{n} is a number, a running count through the mmo file,
2493         starting at 0.
2494
2495 EXAMPLE
2496         A loadable section specified as:
2497
2498 | .section secname,"ax"
2499 | TETRA 1,2,3,4,-1,-2009
2500 | BYTE 80
2501
2502         and linked to address @samp{0x4}, is represented by the sequence:
2503
2504 | 0x98080050 - lop_spec 80
2505 | 0x00000002 - two 32-bit words for the section name
2506 | 0x7365636e - "secn"
2507 | 0x616d6500 - "ame\0"
2508 | 0x00000033 - flags CODE, READONLY, LOAD, ALLOC
2509 | 0x00000000 - high 32 bits of section length
2510 | 0x0000001c - section length is 28 bytes; 6 * 4 + 1 + alignment to 32 bits
2511 | 0x00000000 - high 32 bits of section address
2512 | 0x00000004 - section address is 4
2513 | 0x98010002 - 64 bits with address of following data
2514 | 0x00000000 - high 32 bits of address
2515 | 0x00000004 - low 32 bits: data starts at address 4
2516 | 0x00000001 - 1
2517 | 0x00000002 - 2
2518 | 0x00000003 - 3
2519 | 0x00000004 - 4
2520 | 0xffffffff - -1
2521 | 0xfffff827 - -2009
2522 | 0x50000000 - 80 as a byte, padded with zeros.
2523
2524         Note that the lop_spec wrapping does not include the section
2525         contents.  Compare this to a non-loaded section specified as:
2526
2527 | .section thirdsec
2528 | TETRA 200001,100002
2529 | BYTE 38,40
2530
2531         This, when linked to address @samp{0x200000000000001c}, is
2532         represented by:
2533
2534 | 0x98080050 - lop_spec 80
2535 | 0x00000002 - two 32-bit words for the section name
2536 | 0x7365636e - "thir"
2537 | 0x616d6500 - "dsec"
2538 | 0x00000010 - flag READONLY
2539 | 0x00000000 - high 32 bits of section length
2540 | 0x0000000c - section length is 12 bytes; 2 * 4 + 2 + alignment to 32 bits
2541 | 0x20000000 - high 32 bits of address
2542 | 0x0000001c - low 32 bits of address 0x200000000000001c
2543 | 0x00030d41 - 200001
2544 | 0x000186a2 - 100002
2545 | 0x26280000 - 38, 40 as bytes, padded with zeros
2546
2547         For the latter example, the section contents must not be
2548         loaded in memory, and is therefore specified as part of the
2549         special data.  The address is usually unimportant but might
2550         provide information for e.g.@: the DWARF 2 debugging format.  */
2551
2552   mmo_write_tetra_raw (abfd, LOP_SPEC_SECTION);
2553   mmo_write_tetra (abfd, (strlen (sec->name) + 3) / 4);
2554   mmo_write_chunk (abfd, (bfd_byte *) sec->name, strlen (sec->name));
2555   mmo_flush_chunk (abfd);
2556   /* FIXME: We can get debug sections (.debug_line & Co.) with a section
2557      flag still having SEC_RELOC set.  Investigate.  This might be true
2558      for all alien sections; perhaps mmo.em should clear that flag.  Might
2559      be related to weak references.  */
2560   mmo_write_tetra (abfd,
2561                    mmo_sec_flags_from_bfd_flags
2562                    (bfd_get_section_flags (abfd, sec)));
2563   mmo_write_octa (abfd, sec->size);
2564   mmo_write_octa (abfd, bfd_get_section_vma (abfd, sec));
2565   return TRUE;
2566 }
2567
2568 /* We save up all data before output.  */
2569
2570 static bfd_boolean
2571 mmo_set_section_contents (bfd *abfd ATTRIBUTE_UNUSED, sec_ptr sec,
2572                           const void *location, file_ptr offset,
2573                           bfd_size_type bytes_to_do)
2574 {
2575   /* Iterate over diminishing chunk sizes, copying contents.  */
2576   while (bytes_to_do)
2577     {
2578       /* A minor song-and-dance to make sure we're not bitten by the
2579          distant possibility of the cast from bfd_vma to int making the
2580          chunk zero-sized.  */
2581       int chunk_size
2582         = (int) bytes_to_do != 0 ? bytes_to_do : MMO_SEC_CONTENTS_CHUNK_SIZE;
2583       bfd_byte *loc;
2584
2585       do
2586         loc = mmo_get_loc (sec, sec->vma + offset, chunk_size);
2587       while (loc == NULL && (chunk_size /= 2) != 0);
2588
2589       if (chunk_size == 0)
2590         return FALSE;
2591
2592       memcpy (loc, location, chunk_size);
2593
2594       location += chunk_size;
2595       bytes_to_do -= chunk_size;
2596       offset += chunk_size;
2597     }
2598   return TRUE;
2599 }
2600
2601 /* Add a symbol to a trie-tree.  */
2602
2603 static bfd_boolean
2604 mmo_internal_add_3_sym (bfd *abfd, struct mmo_symbol_trie *rootp,
2605                         const struct mmo_symbol *symp)
2606 {
2607   const char *name = symp->name;
2608   struct mmo_symbol_trie *trie = rootp;
2609   struct mmo_symbol_trie **triep = NULL;
2610
2611   while (*name && trie != NULL)
2612     {
2613       if (*name < trie->symchar)
2614         {
2615           triep = &trie->left;
2616           trie = trie->left;
2617         }
2618       else if (*name > trie->symchar)
2619         {
2620           triep = &trie->right;
2621           trie = trie->right;
2622         }
2623       else if (*name == trie->symchar)
2624         {
2625           triep = &trie->middle;
2626           name++;
2627
2628           /* Make sure "trie" points to where we should fill in the
2629              current symbol whenever we've iterated through "name".  We
2630              would lose the right position if we encounter "foobar" then
2631              "foo".  */
2632           if (*name)
2633             trie = trie->middle;
2634         }
2635     }
2636
2637   while (*name != 0)
2638     {
2639       /* Create middle branches for the rest of the characters.  */
2640       trie = bfd_zalloc (abfd, sizeof (struct mmo_symbol_trie));
2641       *triep = trie;
2642       trie->symchar = *name++;
2643       triep = &trie->middle;
2644     }
2645
2646   /* We discover a duplicate symbol rather late in the process, but still;
2647      we discover it and bail out.  */
2648   if (trie->sym.name != NULL)
2649     {
2650       (*_bfd_error_handler)
2651         (_("%s: invalid symbol table: duplicate symbol `%s'\n"),
2652          bfd_get_filename (abfd), trie->sym.name);
2653       bfd_set_error (bfd_error_bad_value);
2654       return FALSE;
2655     }
2656
2657   memcpy (&trie->sym, symp, sizeof *symp);
2658   return TRUE;
2659 }
2660
2661 /* Find out the length of the serialized version of a trie in bytes.  */
2662
2663 static unsigned int
2664 mmo_internal_3_length (bfd *abfd, struct mmo_symbol_trie *trie)
2665 {
2666   /* First, one for the control byte.  */
2667   unsigned int length = 1;
2668
2669   if (trie == NULL)
2670     return 0;
2671
2672   /* Add in the recursion to the left.  */
2673   length += mmo_internal_3_length (abfd, trie->left);
2674
2675   /* Add in the middle trie and the character.  */
2676   length += 1 + mmo_internal_3_length (abfd, trie->middle);
2677
2678   /* Add in the recursion to the right.  */
2679   length += mmo_internal_3_length (abfd, trie->right);
2680
2681   /* Add in bytes for the symbol (if this is an endnode). */
2682   if (trie->sym.name != NULL)
2683     {
2684       unsigned int serno = trie->sym.serno;
2685
2686       /* First what it takes to encode the value. */
2687       if (trie->sym.sym_type == mmo_reg_sym)
2688         length++;
2689       else if (trie->sym.sym_type == mmo_undef_sym)
2690         length += 2;
2691       else
2692         {
2693           bfd_vma value = trie->sym.value;
2694
2695           /* Coded in one to eight following bytes.  */
2696           if (trie->sym.sym_type == mmo_data_sym)
2697             value -= (bfd_vma) 0x20 << 56;
2698
2699           do
2700             {
2701               value >>= 8;
2702               length++;
2703             }
2704           while (value != 0);
2705         }
2706
2707       /* Find out what it takes to encode the serial number.  */
2708       do
2709         {
2710           serno >>= 7;
2711           length++;
2712         }
2713       while (serno != 0);
2714     }
2715
2716   return length;
2717 }
2718
2719 /* Helper function for outputting the serial number of a symbol, output as
2720    a variant of leb128 (see dwarf2 documentation) which could be called
2721    beb128.  Using a helper function and recursion simplifies debugging.  */
2722
2723 static void
2724 mmo_beb128_out (bfd *abfd, int serno, int marker)
2725 {
2726   if (serno & ~0x7f)
2727     mmo_beb128_out (abfd, serno >> 7, 0);
2728   mmo_write_byte (abfd, marker | (serno & 0x7f));
2729 }
2730
2731 /* Serialize a trie.  */
2732
2733 static void
2734 mmo_internal_3_dump (bfd *abfd, struct mmo_symbol_trie *trie)
2735 {
2736   bfd_byte control = 0;
2737
2738   if (trie == NULL)
2739     return;
2740
2741   if (trie->left)
2742     control |= MMO3_LEFT;
2743
2744   if (trie->middle)
2745     control |= MMO3_MIDDLE;
2746
2747   if (trie->right)
2748     control |= MMO3_RIGHT;
2749
2750   if (trie->sym.name != NULL)
2751     {
2752       /* Encode the symbol type and length of value bytes.  */
2753       if (trie->sym.sym_type == mmo_reg_sym)
2754         control |= MMO3_REGQUAL_BITS;
2755       else if (trie->sym.sym_type == mmo_undef_sym)
2756         control |= MMO3_UNDEF;
2757       else
2758         {
2759           bfd_vma value = trie->sym.value;
2760
2761           /* Coded in 1..8 following bytes.  */
2762           if (trie->sym.sym_type == mmo_data_sym)
2763             {
2764               control |= MMO3_DATA;
2765               value -= (bfd_vma) 0x20 << 56;
2766             }
2767
2768           do
2769             {
2770               value >>= 8;
2771               control++;
2772             }
2773           while (value != 0);
2774         }
2775     }
2776
2777   /* The control byte is output before recursing.  */
2778   mmo_write_byte (abfd, control);
2779
2780   mmo_internal_3_dump (abfd, trie->left);
2781
2782   if (control & MMO3_SYMBITS)
2783     {
2784       mmo_write_byte (abfd, trie->symchar);
2785
2786       if (trie->sym.name != NULL)
2787         {
2788           if (trie->sym.sym_type == mmo_reg_sym)
2789             mmo_write_byte (abfd, trie->sym.value);
2790           else if (trie->sym.sym_type == mmo_undef_sym)
2791             {
2792               mmo_write_byte (abfd, 0);
2793               mmo_write_byte (abfd, 0);
2794             }
2795           else
2796             {
2797               bfd_vma value = trie->sym.value;
2798
2799               bfd_byte byte_n = control & 15;
2800
2801               /* Coded in 1..8 following bytes.  Note that the value is
2802                  shifted out big-endian.  */
2803               if (trie->sym.sym_type == mmo_data_sym)
2804                 {
2805                   value -= (bfd_vma) 0x20 << 56;
2806                   byte_n -= 8;
2807                 }
2808
2809               do
2810                 {
2811                   mmo_write_byte (abfd, (value >> ((byte_n - 1) * 8)) & 0xff);
2812                   byte_n--;
2813                 }
2814               while (byte_n != 0);
2815             }
2816
2817           mmo_beb128_out (abfd, trie->sym.serno, 128);
2818         }
2819       mmo_internal_3_dump (abfd, trie->middle);
2820     }
2821   mmo_internal_3_dump (abfd, trie->right);
2822 }
2823
2824 /* Write symbols in mmo format.  Also write the lop_end terminator.  */
2825
2826 static bfd_boolean
2827 mmo_write_symbols_and_terminator (bfd *abfd)
2828 {
2829   int count = bfd_get_symcount (abfd);
2830   asymbol *maintable[2];
2831   asymbol **table;
2832   asymbol **orig_table = bfd_get_outsymbols (abfd);
2833   int serno;
2834   struct mmo_symbol_trie root;
2835   int trie_len;
2836   int i;
2837   bfd_byte buf[4];
2838
2839   /* Create a symbol for "Main".  */
2840   asymbol *fakemain = bfd_make_empty_symbol (abfd);
2841
2842   fakemain->flags = BSF_GLOBAL;
2843   fakemain->value = bfd_get_start_address (abfd);
2844   fakemain->name = MMIX_START_SYMBOL_NAME;
2845   fakemain->section = bfd_abs_section_ptr;
2846   maintable[0] = fakemain;
2847   maintable[1] = NULL;
2848
2849   memset (&root, 0, sizeof (root));
2850
2851   /* Make all symbols take a left turn.  */
2852   root.symchar = 0xff;
2853
2854   /* There must always be a ":Main", so we'll add one if there are no
2855      symbols.  Make sure we have room for it.  */
2856   table = bfd_alloc (abfd, (count + 1) * sizeof (asymbol *));
2857   if (table == NULL)
2858     return FALSE;
2859
2860   memcpy (table, orig_table, count * sizeof (asymbol *));
2861
2862   /* Move :Main (if there is one) to the first position.  This is
2863      necessary to get the same layout of the trie-tree when linking as
2864      when objcopying the result as in the objcopy.exp test "simple objcopy
2865      of executable".  It also automatically takes care of assigning serial
2866      number 1 to :Main (as is mandatory).  */
2867   for (i = 0; i < count; i++)
2868     if (table[i] != NULL
2869         && strcmp (table[i]->name, MMIX_START_SYMBOL_NAME) == 0
2870         && (table[i]->flags & (BSF_DEBUGGING|BSF_GLOBAL)) == BSF_GLOBAL)
2871       {
2872         asymbol *mainsym = table[i];
2873         memcpy (table + 1, orig_table, i * sizeof (asymbol *));
2874         table[0] = mainsym;
2875
2876         /* Check that the value assigned to :Main is the same as the entry
2877            address.  The default linker script asserts this.  This is as
2878            good a place as any to check this consistency. */
2879         if ((mainsym->value
2880              + mainsym->section->output_section->vma
2881              + mainsym->section->output_offset)
2882             != bfd_get_start_address (abfd))
2883           {
2884             /* Arbitrary buffer to hold the printable representation of a
2885                vma.  */
2886             char vmas_main[40];
2887             char vmas_start[40];
2888             bfd_vma vma_start = bfd_get_start_address (abfd);
2889
2890             sprintf_vma (vmas_main, mainsym->value);
2891             sprintf_vma (vmas_start, vma_start);
2892
2893             (*_bfd_error_handler)
2894               (_("%s: Bad symbol definition: `Main' set to %s rather"
2895                  " than the start address %s\n"),
2896                bfd_get_filename (abfd), vmas_main, vmas_start);
2897             bfd_set_error (bfd_error_bad_value);
2898             return FALSE;
2899           }
2900         break;
2901       }
2902   if (i == count && count != 0)
2903     {
2904       /* When there are symbols, there must be a :Main.  There was no
2905          :Main, so we need to add it manually.  */
2906       memcpy (table + 1, orig_table, count * sizeof (asymbol *));
2907       table[0] = fakemain;
2908       count++;
2909     }
2910
2911   for (i = 0, serno = 1; i < count && table[i] != NULL; i++)
2912     {
2913       asymbol *s = table[i];
2914
2915       /* It's not enough to consult bfd_is_local_label, since it does not
2916          mean "local" in the sense of linkable-and-observable-after-link.
2917          Let's just check the BSF_GLOBAL flag.
2918
2919          Also, don't export symbols with characters not in the allowed set.  */
2920       if ((s->flags & (BSF_DEBUGGING|BSF_GLOBAL)) == BSF_GLOBAL
2921           && strspn (s->name,
2922                      valid_mmo_symbol_character_set) == strlen (s->name))
2923         {
2924           struct mmo_symbol sym;
2925           memset (&sym, 0, sizeof (sym));
2926
2927           /* Need to strip const here; strdup:ing would leak and the
2928              existing string must be safe to reuse.  */
2929           sym.name = (char *) s->name;
2930           sym.value =
2931             s->value
2932             + s->section->output_section->vma
2933             + s->section->output_offset;
2934
2935           if (bfd_is_und_section (s->section))
2936             sym.sym_type = mmo_undef_sym;
2937           else if (strcmp (s->section->name, MMO_DATA_SECTION_NAME) == 0
2938                    /* The encoding of data symbols require that the "rest"
2939                       of the value fits in 6 bytes, so the upper two bytes
2940                       must be 0x2000.  All other symbols get to be the
2941                       absolute type.  */
2942                    && (sym.value >> 48) == 0x2000)
2943             sym.sym_type = mmo_data_sym;
2944           else if (strcmp (s->section->name, MMIX_REG_SECTION_NAME) == 0)
2945             sym.sym_type = mmo_reg_sym;
2946           else if (strcmp (s->section->name,
2947                            MMIX_REG_CONTENTS_SECTION_NAME) == 0)
2948             {
2949               sym.sym_type = mmo_reg_sym;
2950               sym.value /= 8;
2951             }
2952           else
2953             sym.sym_type = mmo_abs_sym;
2954
2955           /* FIXME: We assume the order of the received symbols is an
2956              ordered mapping of the serial numbers.  This is not
2957              necessarily true if we e.g. objcopy a mmo file to another and
2958              there are gaps in the numbering.  Not sure if this can
2959              happen.  Not sure what to do.  */
2960           sym.serno = serno++;
2961
2962           if (! mmo_internal_add_3_sym (abfd, &root, &sym))
2963             return FALSE;
2964         }
2965     }
2966
2967   /* Change the root node to be a ":"-prefix.  */
2968   root.symchar = ':';
2969   root.middle = root.left;
2970   root.right = NULL;
2971   root.left = NULL;
2972
2973   /* We have to find out if we can fit the whole symbol table in the mmo
2974      symtab.  It would be bad to assume we can always fit it in 262144
2975      bytes.  If we can't, just leave the Main symbol.  */
2976   trie_len = (mmo_internal_3_length (abfd, &root) + 3)/4;
2977
2978   if (trie_len > 0xffff)
2979     {
2980       /* Test this code by using a lower limit in the test above and check
2981          that the single "Main" symbol is emitted and handled properly.
2982          There's no specific test-case.  */
2983       struct mmo_symbol sym;
2984
2985       (*_bfd_error_handler)
2986         (_("%s: warning: symbol table too large for mmo, larger than 65535"
2987            " 32-bit words: %d.  Only `Main' will be emitted.\n"),
2988          bfd_get_filename (abfd), trie_len);
2989
2990       memset (&sym, 0, sizeof (sym));
2991       sym.sym_type = mmo_abs_sym;
2992       sym.name = MMIX_START_SYMBOL_NAME;
2993       sym.serno = 1;
2994       sym.value = bfd_get_start_address (abfd);
2995
2996       /* Then patch up a symbol table to be just the ":Main" symbol.  */
2997       memset (&root, 0, sizeof (root));
2998       root.left = root.middle;
2999       root.symchar = 0xff;
3000       root.middle = NULL;
3001       root.right = NULL;
3002
3003       if (! mmo_internal_add_3_sym (abfd, &root, &sym))
3004         return FALSE;
3005
3006       root.symchar = ':';
3007       root.middle = root.left;
3008       root.right = NULL;
3009       root.left = NULL;
3010
3011       trie_len = (mmo_internal_3_length (abfd, &root) + 3)/4;
3012     }
3013
3014   /* Reset the written-bytes counter.  */
3015   abfd->tdata.mmo_data->byte_no = 0;
3016
3017   /* Put out the lop_stab mark.  */
3018   bfd_put_32 (abfd, (LOP << 24) | (LOP_STAB << 16), buf);
3019   if (bfd_bwrite (buf, 4, abfd) != 4)
3020     return FALSE;
3021
3022   /* Dump out symbols.  */
3023   mmo_internal_3_dump (abfd, &root);
3024
3025   if (trie_len != (abfd->tdata.mmo_data->byte_no + 3)/4)
3026     {
3027       /* I haven't seen this trig.  It seems no use claiming this case
3028          isn't debugged and abort if we get here.  Instead emit a
3029          diagnostic and fail "normally".  */
3030       (*_bfd_error_handler)
3031         (_("%s: internal error, symbol table changed size from %d to %d"
3032            " words\n"),
3033          bfd_get_filename (abfd), trie_len,
3034          (abfd->tdata.mmo_data->byte_no + 3)/4);
3035       bfd_set_error (bfd_error_bad_value);
3036       return FALSE;
3037     }
3038
3039   /* Dump out remaining bytes in the buffer and handle I/O errors by
3040      propagating errors.  */
3041   if ((abfd->tdata.mmo_data->byte_no % 4) != 0
3042       || abfd->tdata.mmo_data->have_error)
3043     {
3044       memset (abfd->tdata.mmo_data->buf + (abfd->tdata.mmo_data->byte_no % 4),
3045               0, 4 - (abfd->tdata.mmo_data->byte_no % 4));
3046
3047       if (abfd->tdata.mmo_data->have_error
3048           || bfd_bwrite (abfd->tdata.mmo_data->buf, 4, abfd) != 4)
3049         return FALSE;
3050     }
3051
3052   bfd_put_32 (abfd, (LOP << 24) | (LOP_END << 16) | trie_len, buf);
3053   return bfd_bwrite (buf, 4, abfd) == 4;
3054 }
3055
3056 /* Write section unless it is the register contents section.  For that, we
3057    instead store the section in the supplied pointer.  This function is
3058    used through bfd_map_over_sections.  */
3059
3060 static void
3061 mmo_write_section_unless_reg_contents (bfd *abfd, asection *sec, void *p)
3062 {
3063   struct mmo_write_sec_info *infop = (struct mmo_write_sec_info *) p;
3064
3065   if (! infop->retval)
3066     return;
3067
3068   if (strcmp (sec->name, MMIX_REG_CONTENTS_SECTION_NAME) == 0)
3069     {
3070       infop->reg_section = sec;
3071       return;
3072     }
3073
3074   /* Exclude the convenience register section.  */
3075   if (strcmp (sec->name, MMIX_REG_SECTION_NAME) == 0)
3076     {
3077       if (bfd_get_section_flags (abfd, sec) & SEC_HAS_CONTENTS)
3078         {
3079           /* Make sure it hasn't got contents.  It seems impossible to
3080              make it carry contents, so we don't have a test-case for
3081              this.  */
3082           (*_bfd_error_handler)
3083             (_("%s: internal error, internal register section %s had"
3084                " contents\n"),
3085              bfd_get_filename (abfd), sec->name);
3086           bfd_set_error (bfd_error_bad_value);
3087           infop->retval = FALSE;
3088           return;
3089         }
3090
3091       return;
3092     }
3093
3094   infop->retval = mmo_internal_write_section (abfd, sec);
3095 }
3096
3097 /* Do the actual output of a file.  Assumes mmo_set_section_contents is
3098    already called. */
3099
3100 static bfd_boolean
3101 mmo_write_object_contents (bfd *abfd)
3102 {
3103   struct mmo_write_sec_info wsecinfo;
3104
3105   /* First, there are a few words of preamble.  */
3106   if (! mmo_internal_write_header (abfd))
3107     return FALSE;
3108
3109   wsecinfo.reg_section = NULL;
3110   wsecinfo.retval = TRUE;
3111
3112   bfd_map_over_sections (abfd, mmo_write_section_unless_reg_contents,
3113                          &wsecinfo);
3114
3115   if (! wsecinfo.retval)
3116     return FALSE;
3117
3118   if (wsecinfo.reg_section != NULL)
3119     {
3120       asection *sec = wsecinfo.reg_section;
3121       unsigned int z = (unsigned int) (sec->vma / 8);
3122
3123       /* Registers 0..31 must not be global.  Do sanity check on the "vma"
3124          of the register contents section and check that it corresponds to
3125          the length of the section.  */
3126       if (z < 32 || z >= 255 || (sec->vma & 7) != 0
3127           || sec->vma != 256 * 8 - sec->size - 8)
3128         {
3129           bfd_set_error (bfd_error_bad_value);
3130
3131           if (sec->size == 0)
3132             /* There must always be at least one such register.  */
3133             (*_bfd_error_handler)
3134               (_("%s: no initialized registers; section length 0\n"),
3135                bfd_get_filename (abfd));
3136           else if (sec->vma > (256 - 32) * 8)
3137             /* Provide better error message for the case of too many
3138                global registers.  */
3139             (*_bfd_error_handler)
3140               (_("%s: too many initialized registers; section length %ld\n"),
3141                bfd_get_filename (abfd),
3142                (long) sec->size);
3143           else
3144             (*_bfd_error_handler)
3145               (_("%s: invalid start address for initialized registers of"
3146                  " length %ld: 0x%lx%08lx\n"),
3147                bfd_get_filename (abfd),
3148                (long) sec->size,
3149                (unsigned long) (sec->vma >> 32), (unsigned long) (sec->vma));
3150
3151           return FALSE;
3152         }
3153
3154       if (! mmo_internal_write_post (abfd, z, sec))
3155         return FALSE;
3156     }
3157   else
3158     if (! mmo_internal_write_post (abfd, 255, NULL))
3159       return FALSE;
3160
3161   return mmo_write_symbols_and_terminator (abfd);
3162 }
3163
3164 /* Return the size of a NULL pointer, so we support linking in an mmo
3165    object.  */
3166
3167 static long
3168 mmo_get_reloc_upper_bound (bfd *abfd ATTRIBUTE_UNUSED,
3169                            asection *sec ATTRIBUTE_UNUSED)
3170 {
3171   return sizeof (void *);
3172 }
3173
3174 /* Similarly canonicalize relocs to empty, filling in the terminating NULL
3175    pointer.  */
3176
3177 long
3178 mmo_canonicalize_reloc (bfd *abfd ATTRIBUTE_UNUSED,
3179                         sec_ptr section ATTRIBUTE_UNUSED, arelent **relptr,
3180                         asymbol **symbols ATTRIBUTE_UNUSED)
3181 {
3182   *relptr = NULL;
3183   return 0;
3184 }
3185
3186 /* If there's anything in particular in a mmo bfd that we want to free,
3187    make this a real function.  Only do this if you see major memory
3188    thrashing; zealous free:ing will cause unwanted behavior, especially if
3189    you "free" memory allocated with "bfd_alloc", or even "bfd_release" a
3190    block allocated with "bfd_alloc"; they're really allocated from an
3191    obstack, and we don't know what was allocated there since this
3192    particular allocation.  */
3193
3194 #define mmo_close_and_cleanup _bfd_generic_close_and_cleanup
3195 #define mmo_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
3196
3197 /* Perhaps we need to adjust this one; mmo labels (originally) without a
3198    leading ':' might more appropriately be called local.  */
3199 #define mmo_bfd_is_local_label_name bfd_generic_is_local_label_name
3200 #define mmo_bfd_is_target_special_symbol  \
3201   ((bfd_boolean (*) (bfd *, asymbol *)) bfd_false)
3202
3203 /* Is this one really used or defined by anyone?  */
3204 #define mmo_get_lineno _bfd_nosymbols_get_lineno
3205
3206 /* FIXME: We can do better on this one, if we have a dwarf2 .debug_line
3207    section or if MMO line numbers are implemented.  */
3208 #define mmo_find_nearest_line _bfd_nosymbols_find_nearest_line
3209 #define mmo_find_inliner_info _bfd_nosymbols_find_inliner_info
3210 #define mmo_make_empty_symbol _bfd_generic_make_empty_symbol
3211 #define mmo_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
3212 #define mmo_read_minisymbols _bfd_generic_read_minisymbols
3213 #define mmo_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
3214
3215 #define mmo_get_section_contents_in_window \
3216   _bfd_generic_get_section_contents_in_window
3217 #define mmo_bfd_get_relocated_section_contents \
3218   bfd_generic_get_relocated_section_contents
3219 #define mmo_bfd_gc_sections bfd_generic_gc_sections
3220 #define mmo_bfd_link_hash_table_create _bfd_generic_link_hash_table_create
3221 #define mmo_bfd_link_hash_table_free _bfd_generic_link_hash_table_free
3222 #define mmo_bfd_link_add_symbols _bfd_generic_link_add_symbols
3223 #define mmo_bfd_link_just_syms _bfd_generic_link_just_syms
3224 #define mmo_bfd_final_link _bfd_generic_final_link
3225 #define mmo_bfd_link_split_section _bfd_generic_link_split_section
3226
3227 /* Strictly speaking, only MMIX uses this restricted format, but let's not
3228    stop anybody from shooting themselves in the foot.  */
3229 #define mmo_set_arch_mach bfd_default_set_arch_mach
3230 #define mmo_bfd_relax_section bfd_generic_relax_section
3231 #define mmo_bfd_merge_sections bfd_generic_merge_sections
3232 #define mmo_bfd_is_group_section bfd_generic_is_group_section
3233 #define mmo_bfd_discard_group bfd_generic_discard_group
3234 #define mmo_section_already_linked \
3235   _bfd_generic_section_already_linked
3236
3237 /* objcopy will be upset if we return -1 from bfd_get_reloc_upper_bound by
3238    using BFD_JUMP_TABLE_RELOCS (_bfd_norelocs) rather than 0.  FIXME: Most
3239    likely a bug in the _bfd_norelocs definition.
3240
3241    On the other hand, we smuggle in an mmo object (because setting up ELF
3242    is too cumbersome) when linking (from other formats, presumably ELF) to
3243    represent the g255 entry.  We need to link that object, so need to say
3244    it has no relocs.  Upper bound for the size of the relocation table is
3245    the size of a NULL pointer, and we support "canonicalization" for that
3246    pointer.  */
3247 #define mmo_bfd_reloc_type_lookup _bfd_norelocs_bfd_reloc_type_lookup
3248
3249 /* We want to copy time of creation, otherwise we'd use
3250    BFD_JUMP_TABLE_COPY (_bfd_generic).  */
3251 #define mmo_bfd_merge_private_bfd_data _bfd_generic_bfd_merge_private_bfd_data
3252 #define mmo_bfd_copy_private_section_data _bfd_generic_bfd_copy_private_section_data
3253 #define mmo_bfd_copy_private_symbol_data _bfd_generic_bfd_copy_private_symbol_data
3254 #define mmo_bfd_copy_private_header_data _bfd_generic_bfd_copy_private_header_data
3255 #define mmo_bfd_set_private_flags _bfd_generic_bfd_set_private_flags
3256 #define mmo_bfd_print_private_bfd_data _bfd_generic_bfd_print_private_bfd_data
3257
3258 const bfd_target bfd_mmo_vec =
3259 {
3260   "mmo",                        /* name */
3261   bfd_target_mmo_flavour,
3262   BFD_ENDIAN_BIG,               /* target byte order */
3263   BFD_ENDIAN_BIG,               /* target headers byte order */
3264
3265   /* FIXME: Might need adjustments.  */
3266   (HAS_RELOC | EXEC_P |         /* object flags */
3267    HAS_LINENO | HAS_DEBUG |
3268    HAS_SYMS | HAS_LOCALS | WP_TEXT),
3269
3270   /* FIXME: Might need adjustments.  */
3271   (SEC_CODE | SEC_DATA | SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD
3272    | SEC_READONLY | SEC_EXCLUDE | SEC_DEBUGGING | SEC_IN_MEMORY),
3273                                 /* section flags */
3274   0,                            /* leading underscore */
3275   ' ',                          /* ar_pad_char */
3276   16,                           /* ar_max_namelen */
3277   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
3278   bfd_getb32, bfd_getb_signed_32, bfd_putb32,
3279   bfd_getb16, bfd_getb_signed_16, bfd_putb16,   /* data */
3280   bfd_getb64, bfd_getb_signed_64, bfd_putb64,
3281   bfd_getb32, bfd_getb_signed_32, bfd_putb32,
3282   bfd_getb16, bfd_getb_signed_16, bfd_putb16,   /* hdrs */
3283
3284   {
3285     _bfd_dummy_target,
3286     mmo_object_p,               /* bfd_check_format */
3287     _bfd_dummy_target,
3288     _bfd_dummy_target,
3289   },
3290   {
3291     bfd_false,
3292     mmo_mkobject,
3293     bfd_false,
3294     bfd_false,
3295   },
3296   {                             /* bfd_write_contents */
3297     bfd_false,
3298     mmo_write_object_contents,
3299     bfd_false,
3300     bfd_false,
3301   },
3302
3303   BFD_JUMP_TABLE_GENERIC (mmo),
3304   BFD_JUMP_TABLE_COPY (mmo),
3305   BFD_JUMP_TABLE_CORE (_bfd_nocore),
3306   BFD_JUMP_TABLE_ARCHIVE (_bfd_noarchive),
3307   BFD_JUMP_TABLE_SYMBOLS (mmo),
3308   /* We have to provide a valid method for getting relocs, returning zero,
3309      so we can't say BFD_JUMP_TABLE_RELOCS (_bfd_norelocs).  */
3310   BFD_JUMP_TABLE_RELOCS (mmo),
3311   BFD_JUMP_TABLE_WRITE (mmo),
3312   BFD_JUMP_TABLE_LINK (mmo),
3313   BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
3314
3315   NULL,
3316
3317   NULL
3318 };