include/aout/aout64.h

   1 /* `a.out' object-file definitions, including extensions to 64-bit fields */
   2
   3 #ifndef __A_OUT_64_H__
   4 #define __A_OUT_64_H__
   5
   6 /* This is the layout on disk of the 32-bit or 64-bit exec header. */
   7
   8 #ifndef external_exec
   9 struct external_exec
  10 {
  11   bfd_byte e_info[4];           /* magic number and stuff               */
  12   bfd_byte e_text[BYTES_IN_WORD]; /* length of text section in bytes    */
  13   bfd_byte e_data[BYTES_IN_WORD]; /* length of data section in bytes    */
  14   bfd_byte e_bss[BYTES_IN_WORD]; /* length of bss area in bytes                 */
  15   bfd_byte e_syms[BYTES_IN_WORD]; /* length of symbol table in bytes    */
  16   bfd_byte e_entry[BYTES_IN_WORD]; /* start address                     */
  17   bfd_byte e_trsize[BYTES_IN_WORD]; /* length of text relocation info   */
  18   bfd_byte e_drsize[BYTES_IN_WORD]; /* length of data relocation info   */
  19 };
  20
  21 #define EXEC_BYTES_SIZE (4 + BYTES_IN_WORD * 7)
  22
  23 /* Magic numbers for a.out files */
  24
  25 #if ARCH_SIZE==64
  26 #define OMAGIC 0x1001           /* Code indicating object file  */
  27 #define ZMAGIC 0x1002           /* Code indicating demand-paged executable.  */
  28 #define NMAGIC 0x1003           /* Code indicating pure executable.  */
  29
  30 /* There is no 64-bit QMAGIC as far as I know.  */
  31
  32 #define N_BADMAG(x)       (N_MAGIC(x) != OMAGIC         \
  33                         && N_MAGIC(x) != NMAGIC         \
  34                         && N_MAGIC(x) != ZMAGIC)
  35 #else
  36 #define OMAGIC 0407             /* ...object file or impure executable.  */
  37 #define NMAGIC 0410             /* Code indicating pure executable.  */
  38 #define ZMAGIC 0413             /* Code indicating demand-paged executable.  */
  39 #define BMAGIC 0415             /* Used by a b.out object.  */
  40
  41 /* This indicates a demand-paged executable with the header in the text.
  42    It is used by 386BSD (and variants) and Linux, at least.  */
  43 #ifndef QMAGIC
  44 #define QMAGIC 0314
  45 #endif
  46 # ifndef N_BADMAG
  47 #  define N_BADMAG(x)     (N_MAGIC(x) != OMAGIC         \
  48                         && N_MAGIC(x) != NMAGIC         \
  49                         && N_MAGIC(x) != ZMAGIC \
  50                         && N_MAGIC(x) != QMAGIC)
  51 # endif /* N_BADMAG */
  52 #endif
  53
  54 #endif
  55
  56 #ifdef QMAGIC
  57 #define N_IS_QMAGIC(x) (N_MAGIC (x) == QMAGIC)
  58 #else
  59 #define N_IS_QMAGIC(x) (0)
  60 #endif
  61
  62 /* The difference between TARGET_PAGE_SIZE and N_SEGSIZE is that TARGET_PAGE_SIZE is
  63    the finest granularity at which you can page something, thus it
  64    controls the padding (if any) before the text segment of a ZMAGIC
  65    file.  N_SEGSIZE is the resolution at which things can be marked as
  66    read-only versus read/write, so it controls the padding between the
  67    text segment and the data segment (in memory; on disk the padding
  68    between them is TARGET_PAGE_SIZE).  TARGET_PAGE_SIZE and N_SEGSIZE are the same
  69    for most machines, but different for sun3.  */
  70
  71 /* By default, segment size is constant.  But some machines override this
  72    to be a function of the a.out header (e.g. machine type).  */
  73
  74 #ifndef N_SEGSIZE
  75 #define N_SEGSIZE(x)    SEGMENT_SIZE
  76 #endif
  77 \f
  78 /* Virtual memory address of the text section.
  79    This is getting very complicated.  A good reason to discard a.out format
  80    for something that specifies these fields explicitly.  But til then...
  81
  82    * OMAGIC and NMAGIC files:
  83        (object files: text for "relocatable addr 0" right after the header)
  84        start at 0, offset is EXEC_BYTES_SIZE, size as stated.
  85    * The text address, offset, and size of ZMAGIC files depend
  86      on the entry point of the file:
  87      * entry point below TEXT_START_ADDR:
  88        (hack for SunOS shared libraries)
  89        start at 0, offset is 0, size as stated.
  90      * If N_HEADER_IN_TEXT(x) is true (which defaults to being the
  91        case when the entry point is EXEC_BYTES_SIZE or further into a page):
  92        no padding is needed; text can start after exec header.  Sun
  93        considers the text segment of such files to include the exec header;
  94        for BFD's purposes, we don't, which makes more work for us.
  95        start at TEXT_START_ADDR + EXEC_BYTES_SIZE, offset is EXEC_BYTES_SIZE,
  96        size as stated minus EXEC_BYTES_SIZE.
  97      * If N_HEADER_IN_TEXT(x) is false (which defaults to being the case when
  98        the entry point is less than EXEC_BYTES_SIZE into a page (e.g. page
  99        aligned)): (padding is needed so that text can start at a page boundary)
 100        start at TEXT_START_ADDR, offset TARGET_PAGE_SIZE, size as stated.
 101
 102     Specific configurations may want to hardwire N_HEADER_IN_TEXT,
 103     for efficiency or to allow people to play games with the entry point.
 104     In that case, you would #define N_HEADER_IN_TEXT(x) as 1 for sunos,
 105     and as 0 for most other hosts (Sony News, Vax Ultrix, etc).
 106     (Do this in the appropriate bfd target file.)
 107     (The default is a heuristic that will break if people try changing
 108     the entry point, perhaps with the ld -e flag.)
 109
 110     * QMAGIC is always like a ZMAGIC for which N_HEADER_IN_TEXT is true,
 111     and for which the starting address is TARGET_PAGE_SIZE (or should this be
 112     SEGMENT_SIZE?) (TEXT_START_ADDR only applies to ZMAGIC, not to QMAGIC).
 113     */
 114
 115 /* This macro is only relevant for ZMAGIC files; QMAGIC always has the header
 116    in the text.  */
 117 #ifndef N_HEADER_IN_TEXT
 118 #define N_HEADER_IN_TEXT(x) (((x).a_entry & (TARGET_PAGE_SIZE-1)) >= EXEC_BYTES_SIZE)
 119 #endif
 120
 121 /* Sun shared libraries, not linux.  This macro is only relevant for ZMAGIC
 122    files.  */
 123 #ifndef N_SHARED_LIB
 124 #if defined (TEXT_START_ADDR) && TEXT_START_ADDR == 0
 125 #define N_SHARED_LIB(x) (0)
 126 #else
 127 #define N_SHARED_LIB(x) ((x).a_entry < TEXT_START_ADDR)
 128 #endif
 129 #endif
 130
 131 /* Returning 0 not TEXT_START_ADDR for OMAGIC and NMAGIC is based on
 132    the assumption that we are dealing with a .o file, not an
 133    executable.  This is necessary for OMAGIC (but means we don't work
 134    right on the output from ld -N); more questionable for NMAGIC.  */
 135
 136 #ifndef N_TXTADDR
 137 #define N_TXTADDR(x) \
 138     (/* The address of a QMAGIC file is always one page in, */ \
 139      /* with the header in the text.  */ \
 140      N_IS_QMAGIC (x) ? TARGET_PAGE_SIZE + EXEC_BYTES_SIZE : \
 141      N_MAGIC(x) != ZMAGIC ? 0 : /* object file or NMAGIC */\
 142      N_SHARED_LIB(x) ? 0 :      \
 143      N_HEADER_IN_TEXT(x)  ?     \
 144             TEXT_START_ADDR + EXEC_BYTES_SIZE : /* no padding */\
 145             TEXT_START_ADDR                     /* a page of padding */\
 146     )
 147 #endif
 148
 149 /* If N_HEADER_IN_TEXT is not true for ZMAGIC, there is some padding
 150    to make the text segment start at a certain boundary.  For most
 151    systems, this boundary is TARGET_PAGE_SIZE.  But for Linux, in the
 152    time-honored tradition of crazy ZMAGIC hacks, it is 1024 which is
 153    not what TARGET_PAGE_SIZE needs to be for QMAGIC.  */
 154
 155 #ifndef ZMAGIC_DISK_BLOCK_SIZE
 156 #define ZMAGIC_DISK_BLOCK_SIZE TARGET_PAGE_SIZE
 157 #endif
 158
 159 #define N_DISK_BLOCK_SIZE(x) \
 160   (N_MAGIC(x) == ZMAGIC ? ZMAGIC_DISK_BLOCK_SIZE : TARGET_PAGE_SIZE)
 161
 162 /* Offset in an a.out of the start of the text section. */
 163 #ifndef N_TXTOFF
 164 #define N_TXTOFF(x)     \
 165     (/* For {O,N,Q}MAGIC, no padding.  */ \
 166      N_MAGIC(x) != ZMAGIC ? EXEC_BYTES_SIZE : \
 167      N_SHARED_LIB(x) ? 0 : \
 168      N_HEADER_IN_TEXT(x) ?      \
 169             EXEC_BYTES_SIZE :                   /* no padding */\
 170             ZMAGIC_DISK_BLOCK_SIZE              /* a page of padding */\
 171     )
 172 #endif
 173 /* Size of the text section.  It's always as stated, except that we
 174    offset it to `undo' the adjustment to N_TXTADDR and N_TXTOFF
 175    for ZMAGIC files that nominally include the exec header
 176    as part of the first page of text.  (BFD doesn't consider the
 177    exec header to be part of the text segment.)  */
 178 #ifndef N_TXTSIZE
 179 #define N_TXTSIZE(x) \
 180     (/* For QMAGIC, we don't consider the header part of the text section.  */\
 181      N_IS_QMAGIC (x) ? (x).a_text - EXEC_BYTES_SIZE : \
 182      (N_MAGIC(x) != ZMAGIC || N_SHARED_LIB(x)) ? (x).a_text : \
 183      N_HEADER_IN_TEXT(x)  ?     \
 184             (x).a_text - EXEC_BYTES_SIZE:       /* no padding */\
 185             (x).a_text                          /* a page of padding */\
 186     )
 187 #endif
 188 /* The address of the data segment in virtual memory.
 189    It is the text segment address, plus text segment size, rounded
 190    up to a N_SEGSIZE boundary for pure or pageable files. */
 191 #ifndef N_DATADDR
 192 #define N_DATADDR(x) \
 193     (N_MAGIC(x)==OMAGIC? (N_TXTADDR(x)+N_TXTSIZE(x)) \
 194      :  (N_SEGSIZE(x) + ((N_TXTADDR(x)+N_TXTSIZE(x)-1) & ~(N_SEGSIZE(x)-1))))
 195 #endif
 196 /* The address of the BSS segment -- immediately after the data segment.  */
 197
 198 #define N_BSSADDR(x)    (N_DATADDR(x) + (x).a_data)
 199
 200 /* Offsets of the various portions of the file after the text segment.  */
 201
 202 /* For {Q,Z}MAGIC, there is padding to make the data segment start on
 203    a page boundary.  Most of the time the a_text field (and thus
 204    N_TXTSIZE) already contains this padding.  It is possible that for
 205    BSDI and/or 386BSD it sometimes doesn't contain the padding, and
 206    perhaps we should be adding it here.  But this seems kind of
 207    questionable and probably should be BSDI/386BSD-specific if we do
 208    do it.
 209
 210    For NMAGIC (at least for hp300 BSD, probably others), there is
 211    padding in memory only, not on disk, so we must *not* ever pad here
 212    for NMAGIC.  */
 213
 214 #ifndef N_DATOFF
 215 #define N_DATOFF(x) \
 216  (N_TXTOFF(x) + N_TXTSIZE(x))
 217 #endif
 218
 219 #ifndef N_TRELOFF
 220 #define N_TRELOFF(x)    ( N_DATOFF(x) + (x).a_data )
 221 #endif
 222 #ifndef N_DRELOFF
 223 #define N_DRELOFF(x)    ( N_TRELOFF(x) + (x).a_trsize )
 224 #endif
 225 #ifndef N_SYMOFF
 226 #define N_SYMOFF(x)     ( N_DRELOFF(x) + (x).a_drsize )
 227 #endif
 228 #ifndef N_STROFF
 229 #define N_STROFF(x)     ( N_SYMOFF(x) + (x).a_syms )
 230 #endif
 231 \f
 232 /* Symbols */
 233 #ifndef external_nlist
 234 struct external_nlist {
 235   bfd_byte e_strx[BYTES_IN_WORD];       /* index into string table of name */
 236   bfd_byte e_type[1];                   /* type of symbol */
 237   bfd_byte e_other[1];                  /* misc info (usually empty) */
 238   bfd_byte e_desc[2];                   /* description field */
 239   bfd_byte e_value[BYTES_IN_WORD];      /* value of symbol */
 240 };
 241 #define EXTERNAL_NLIST_SIZE (BYTES_IN_WORD+4+BYTES_IN_WORD)
 242 #endif
 243
 244 struct internal_nlist {
 245   unsigned long n_strx;                 /* index into string table of name */
 246   unsigned char n_type;                 /* type of symbol */
 247   unsigned char n_other;                /* misc info (usually empty) */
 248   unsigned short n_desc;                /* description field */
 249   bfd_vma n_value;                      /* value of symbol */
 250 };
 251
 252 /* The n_type field is the symbol type, containing:  */
 253
 254 #define N_UNDF  0       /* Undefined symbol */
 255 #define N_ABS   2       /* Absolute symbol -- defined at particular addr */
 256 #define N_TEXT  4       /* Text sym -- defined at offset in text seg */
 257 #define N_DATA  6       /* Data sym -- defined at offset in data seg */
 258 #define N_BSS   8       /* BSS  sym -- defined at offset in zero'd seg */
 259 #define N_COMM  0x12    /* Common symbol (visible after shared lib dynlink) */
 260 #define N_FN    0x1f    /* File name of .o file */
 261 #define N_FN_SEQ 0x0C   /* N_FN from Sequent compilers (sigh) */
 262 /* Note: N_EXT can only be usefully OR-ed with N_UNDF, N_ABS, N_TEXT,
 263    N_DATA, or N_BSS.  When the low-order bit of other types is set,
 264    (e.g. N_WARNING versus N_FN), they are two different types.  */
 265 #define N_EXT   1       /* External symbol (as opposed to local-to-this-file) */
 266 #define N_TYPE  0x1e
 267 #define N_STAB  0xe0    /* If any of these bits are on, it's a debug symbol */
 268
 269 #define N_INDR 0x0a
 270
 271 /* The following symbols refer to set elements.
 272    All the N_SET[ATDB] symbols with the same name form one set.
 273    Space is allocated for the set in the text section, and each set
 274    elements value is stored into one word of the space.
 275    The first word of the space is the length of the set (number of elements).
 276
 277    The address of the set is made into an N_SETV symbol
 278    whose name is the same as the name of the set.
 279    This symbol acts like a N_DATA global symbol
 280    in that it can satisfy undefined external references.  */
 281
 282 /* These appear as input to LD, in a .o file.  */
 283 #define N_SETA  0x14            /* Absolute set element symbol */
 284 #define N_SETT  0x16            /* Text set element symbol */
 285 #define N_SETD  0x18            /* Data set element symbol */
 286 #define N_SETB  0x1A            /* Bss set element symbol */
 287
 288 /* This is output from LD.  */
 289 #define N_SETV  0x1C            /* Pointer to set vector in data area.  */
 290
 291 /* Warning symbol. The text gives a warning message, the next symbol
 292    in the table will be undefined. When the symbol is referenced, the
 293    message is printed.  */
 294
 295 #define N_WARNING 0x1e
 296
 297 /* Weak symbols.  These are a GNU extension to the a.out format.  The
 298    semantics are those of ELF weak symbols.  Weak symbols are always
 299    externally visible.  The N_WEAK? values are squeezed into the
 300    available slots.  The value of a N_WEAKU symbol is 0.  The values
 301    of the other types are the definitions.  */
 302 #define N_WEAKU 0x0d            /* Weak undefined symbol.  */
 303 #define N_WEAKA 0x0e            /* Weak absolute symbol.  */
 304 #define N_WEAKT 0x0f            /* Weak text symbol.  */
 305 #define N_WEAKD 0x10            /* Weak data symbol.  */
 306 #define N_WEAKB 0x11            /* Weak bss symbol.  */
 307
 308 /* Relocations
 309
 310   There are two types of relocation flavours for a.out systems,
 311   standard and extended. The standard form is used on systems where the
 312   instruction has room for all the bits of an offset to the operand, whilst
 313   the extended form is used when an address operand has to be split over n
 314   instructions. Eg, on the 68k, each move instruction can reference
 315   the target with a displacement of 16 or 32 bits. On the sparc, move
 316   instructions use an offset of 14 bits, so the offset is stored in
 317   the reloc field, and the data in the section is ignored.
 318 */
 319
 320 /* This structure describes a single relocation to be performed.
 321    The text-relocation section of the file is a vector of these structures,
 322    all of which apply to the text section.
 323    Likewise, the data-relocation section applies to the data section.  */
 324
 325 struct reloc_std_external {
 326   bfd_byte      r_address[BYTES_IN_WORD];       /* offset of of data to relocate        */
 327   bfd_byte r_index[3];  /* symbol table index of symbol         */
 328   bfd_byte r_type[1];   /* relocation type                      */
 329 };
 330
 331 #define RELOC_STD_BITS_PCREL_BIG        ((unsigned int) 0x80)
 332 #define RELOC_STD_BITS_PCREL_LITTLE     ((unsigned int) 0x01)
 333
 334 #define RELOC_STD_BITS_LENGTH_BIG       ((unsigned int) 0x60)
 335 #define RELOC_STD_BITS_LENGTH_SH_BIG    5
 336 #define RELOC_STD_BITS_LENGTH_LITTLE    ((unsigned int) 0x06)
 337 #define RELOC_STD_BITS_LENGTH_SH_LITTLE 1
 338
 339 #define RELOC_STD_BITS_EXTERN_BIG       ((unsigned int) 0x10)
 340 #define RELOC_STD_BITS_EXTERN_LITTLE    ((unsigned int) 0x08)
 341
 342 #define RELOC_STD_BITS_BASEREL_BIG      ((unsigned int) 0x08)
 343 #define RELOC_STD_BITS_BASEREL_LITTLE   ((unsigned int) 0x10)
 344
 345 #define RELOC_STD_BITS_JMPTABLE_BIG     ((unsigned int) 0x04)
 346 #define RELOC_STD_BITS_JMPTABLE_LITTLE  ((unsigned int) 0x20)
 347
 348 #define RELOC_STD_BITS_RELATIVE_BIG     ((unsigned int) 0x02)
 349 #define RELOC_STD_BITS_RELATIVE_LITTLE  ((unsigned int) 0x40)
 350
 351 #define RELOC_STD_SIZE  (BYTES_IN_WORD + 3 + 1)         /* Bytes per relocation entry */
 352
 353 struct reloc_std_internal
 354 {
 355   bfd_vma r_address;            /* Address (within segment) to be relocated.  */
 356   /* The meaning of r_symbolnum depends on r_extern.  */
 357   unsigned int r_symbolnum:24;
 358   /* Nonzero means value is a pc-relative offset
 359      and it should be relocated for changes in its own address
 360      as well as for changes in the symbol or section specified.  */
 361   unsigned int r_pcrel:1;
 362   /* Length (as exponent of 2) of the field to be relocated.
 363      Thus, a value of 2 indicates 1<<2 bytes.  */
 364   unsigned int r_length:2;
 365   /* 1 => relocate with value of symbol.
 366      r_symbolnum is the index of the symbol
 367      in files the symbol table.
 368      0 => relocate with the address of a segment.
 369      r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS
 370      (the N_EXT bit may be set also, but signifies nothing).  */
 371   unsigned int r_extern:1;
 372   /* The next three bits are for SunOS shared libraries, and seem to
 373      be undocumented.  */
 374   unsigned int r_baserel:1;     /* Linkage table relative */
 375   unsigned int r_jmptable:1;    /* pc-relative to jump table */
 376   unsigned int r_relative:1;    /* "relative relocation" */
 377   /* unused */
 378   unsigned int r_pad:1;         /* Padding -- set to zero */
 379 };
 380
 381
 382 /* EXTENDED RELOCS  */
 383
 384 struct reloc_ext_external {
 385   bfd_byte r_address[BYTES_IN_WORD];    /* offset of of data to relocate        */
 386   bfd_byte r_index[3];  /* symbol table index of symbol         */
 387   bfd_byte r_type[1];   /* relocation type                      */
 388   bfd_byte r_addend[BYTES_IN_WORD];     /* datum addend                         */
 389 };
 390
 391 #ifndef RELOC_EXT_BITS_EXTERN_BIG
 392 #define RELOC_EXT_BITS_EXTERN_BIG       ((unsigned int) 0x80)
 393 #endif
 394
 395 #ifndef RELOC_EXT_BITS_EXTERN_LITTLE
 396 #define RELOC_EXT_BITS_EXTERN_LITTLE    ((unsigned int) 0x01)
 397 #endif
 398
 399 #ifndef RELOC_EXT_BITS_TYPE_BIG
 400 #define RELOC_EXT_BITS_TYPE_BIG         ((unsigned int) 0x1F)
 401 #endif
 402
 403 #ifndef RELOC_EXT_BITS_TYPE_SH_BIG
 404 #define RELOC_EXT_BITS_TYPE_SH_BIG      0
 405 #endif
 406
 407 #ifndef RELOC_EXT_BITS_TYPE_LITTLE
 408 #define RELOC_EXT_BITS_TYPE_LITTLE      ((unsigned int) 0xF8)
 409 #endif
 410
 411 #ifndef RELOC_EXT_BITS_TYPE_SH_LITTLE
 412 #define RELOC_EXT_BITS_TYPE_SH_LITTLE   3
 413 #endif
 414
 415 /* Bytes per relocation entry */
 416 #define RELOC_EXT_SIZE  (BYTES_IN_WORD + 3 + 1 + BYTES_IN_WORD)
 417
 418 enum reloc_type
 419 {
 420   /* simple relocations */
 421   RELOC_8,                      /* data[0:7] = addend + sv              */
 422   RELOC_16,                     /* data[0:15] = addend + sv             */
 423   RELOC_32,                     /* data[0:31] = addend + sv             */
 424   /* pc-rel displacement */
 425   RELOC_DISP8,                  /* data[0:7] = addend - pc + sv         */
 426   RELOC_DISP16,                 /* data[0:15] = addend - pc + sv        */
 427   RELOC_DISP32,                 /* data[0:31] = addend - pc + sv        */
 428   /* Special */
 429   RELOC_WDISP30,                /* data[0:29] = (addend + sv - pc)>>2   */
 430   RELOC_WDISP22,                /* data[0:21] = (addend + sv - pc)>>2   */
 431   RELOC_HI22,                   /* data[0:21] = (addend + sv)>>10       */
 432   RELOC_22,                     /* data[0:21] = (addend + sv)           */
 433   RELOC_13,                     /* data[0:12] = (addend + sv)           */
 434   RELOC_LO10,                   /* data[0:9] = (addend + sv)            */
 435   RELOC_SFA_BASE,
 436   RELOC_SFA_OFF13,
 437   /* P.I.C. (base-relative) */
 438   RELOC_BASE10,                 /* Not sure - maybe we can do this the */
 439   RELOC_BASE13,                 /* right way now */
 440   RELOC_BASE22,
 441   /* for some sort of pc-rel P.I.C. (?) */
 442   RELOC_PC10,
 443   RELOC_PC22,
 444   /* P.I.C. jump table */
 445   RELOC_JMP_TBL,
 446   /* reputedly for shared libraries somehow */
 447   RELOC_SEGOFF16,
 448   RELOC_GLOB_DAT,
 449   RELOC_JMP_SLOT,
 450   RELOC_RELATIVE,
 451
 452   RELOC_11,
 453   RELOC_WDISP2_14,
 454   RELOC_WDISP19,
 455   RELOC_HHI22,                  /* data[0:21] = (addend + sv) >> 42     */
 456   RELOC_HLO10,                  /* data[0:9] = (addend + sv) >> 32      */
 457
 458   /* 29K relocation types */
 459   RELOC_JUMPTARG,
 460   RELOC_CONST,
 461   RELOC_CONSTH,
 462
 463   /* All the new ones I can think of, for sparc v9 */
 464
 465   RELOC_64,                     /* data[0:63] = addend + sv             */
 466   RELOC_DISP64,                 /* data[0:63] = addend - pc + sv        */
 467   RELOC_WDISP21,                /* data[0:20] = (addend + sv - pc)>>2   */
 468   RELOC_DISP21,                 /* data[0:20] = addend - pc + sv        */
 469   RELOC_DISP14,                 /* data[0:13] = addend - pc + sv        */
 470   /* Q .
 471      What are the other ones,
 472      Since this is a clean slate, can we throw away the ones we dont
 473      understand ? Should we sort the values ? What about using a
 474      microcode format like the 68k ?
 475      */
 476   NO_RELOC
 477   };
 478
 479
 480 struct reloc_internal {
 481   bfd_vma r_address;            /* offset of of data to relocate        */
 482   long  r_index;                /* symbol table index of symbol         */
 483   enum reloc_type r_type;       /* relocation type                      */
 484   bfd_vma r_addend;             /* datum addend                         */
 485 };
 486
 487 /* Q.
 488    Should the length of the string table be 4 bytes or 8 bytes ?
 489
 490    Q.
 491    What about archive indexes ?
 492
 493  */
 494
 495 #endif                          /* __A_OUT_64_H__ */