include/aout64.h

   1 #ifndef __A_OUT_64_H__
   2 #define __A_OUT_64_H__
   3
   4
   5 /* This is the layout on disk of the 64 bit exec header. */
   6
   7 struct external_exec
   8 {
   9   bfd_byte e_info[4];           /* magic number and stuff               */
  10   bfd_byte e_text[BYTES_IN_WORD]; /* length of text section in bytes    */
  11   bfd_byte e_data[BYTES_IN_WORD]; /* length of data section in bytes    */
  12   bfd_byte e_bss[BYTES_IN_WORD]; /* length of bss area in bytes                 */
  13   bfd_byte e_syms[BYTES_IN_WORD]; /* length of symbol table in bytes    */
  14   bfd_byte e_entry[BYTES_IN_WORD]; /* start address                     */
  15   bfd_byte e_trsize[BYTES_IN_WORD]; /* length of text relocation info   */
  16   bfd_byte e_drsize[BYTES_IN_WORD]; /* length of data relocation info   */
  17 };
  18
  19
  20 #define EXEC_BYTES_SIZE (4 + BYTES_IN_WORD * 7)
  21
  22 /* This is the layout in memory of a "struct exec" while we process it.  */
  23 struct internal_exec
  24   {
  25     long a_info;                /* Magic number and flags packed                */
  26     bfd_vma a_text;             /* length of text, in bytes                     */
  27     bfd_vma a_data;             /* length of data, in bytes                     */
  28     bfd_vma a_bss;              /* length of uninitialized data area for file   */
  29     bfd_vma a_syms;             /* length of symbol table data in file          */
  30     bfd_vma a_entry;            /* start address                                */
  31     bfd_vma a_trsize;           /* length of relocation info for text, in bytes */
  32     bfd_vma a_drsize;           /* length of relocation info for data, in bytes */
  33   };
  34
  35
  36 /* Magic number is written
  37 < MSB                >
  38 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
  39 < FLAGS             > <    MACHINE TYPE     >   <  MAGIC                                     >
  40 */
  41 enum machine_type {
  42   M_UNKNOWN = 0,
  43   M_68010 = 1,
  44   M_68020 = 2,
  45   M_SPARC = 3,
  46   /* skip a bunch so we dont run into any of suns numbers */
  47   M_386 = 100,
  48   M_29K = 101,
  49   M_NEWONE = 200,
  50   M_NEWTWO = 201,
  51
  52 };
  53
  54 #define N_DYNAMIC(exec) ((exec).a_info & 0x8000000)
  55
  56 #define N_MAGIC(exec) ((exec).a_info & 0xffff)
  57 #define N_MACHTYPE(exec) ((enum machine_type)(((exec).a_info >> 16) & 0xff))
  58 #define N_FLAGS(exec) (((exec).a_info >> 24) & 0xff)
  59 #define N_SET_INFO(exec, magic, type, flags) \
  60 ((exec).a_info = ((magic) & 0xffff) \
  61  | (((int)(type) & 0xff) << 16) \
  62  | (((flags) & 0xff) << 24))
  63
  64 #define N_SET_MAGIC(exec, magic) \
  65 ((exec).a_info = (((exec).a_info & 0xffff0000) | ((magic) & 0xffff)))
  66
  67 #define N_SET_MACHTYPE(exec, machtype) \
  68 ((exec).a_info = \
  69  ((exec).a_info&0xff00ffff) | ((((int)(machtype))&0xff) << 16))
  70
  71 #define N_SET_FLAGS(exec, flags) \
  72 ((exec).a_info = \
  73  ((exec).a_info&0x00ffffff) | (((flags) & 0xff) << 24))
  74
  75 /* By default, segment size is constant.  But on some machines, it can
  76    be a function of the a.out header (e.g. machine type).  */
  77 #ifndef N_SEGSIZE
  78 #define N_SEGSIZE(x)    SEGMENT_SIZE
  79 #endif
  80
  81 #define _N_HDROFF(x)    (N_SEGSIZE(x) - EXEC_BYTES_SIZE)
  82 /* address in an a.out of the text section. When demand paged, it's
  83  set up a bit to make nothing at 0, when an object file it's 0.
  84  There's a special hack case when the entry point is < TEXT_START_ADDR
  85  for executables, then the real start is 0
  86 */
  87
  88 #define N_TXTADDR(x) \
  89     (N_MAGIC(x)==OMAGIC? 0 \
  90      : (N_MAGIC(x) == ZMAGIC && (x).a_entry < TEXT_START_ADDR)? 0 \
  91      : TEXT_START_ADDR)
  92
  93 /* offset in an a.out of the start of the text section. When demand
  94    paged, this is the start of the file
  95 */
  96
  97 #define N_TXTOFF(x)     ( (N_MAGIC((x)) == ZMAGIC) ? 0 : EXEC_BYTES_SIZE)
  98 #if ARCH_SIZE==64
  99 #define PAGE_SIZE 0x2000
 100 #define OMAGIC 0x1001           /* Code indicating object file  */
 101 #define ZMAGIC 0x1002           /* Code indicating demand-paged executable.  */
 102 #define NMAGIC 0x1003           /* Code indicating pure executable.  */
 103 #else
 104 #ifndef PAGE_SIZE
 105 #define PAGE_SIZE 0x2000
 106 #endif
 107 #define OMAGIC 0407             /* Code indicating object file or impure executable.  */
 108 #define NMAGIC 0410             /* Code indicating pure executable.  */
 109 #define ZMAGIC 0413             /* Code indicating demand-paged executable.  */
 110 #endif
 111
 112 #define N_BADMAG(x)       (N_MAGIC(x) != OMAGIC         \
 113                         && N_MAGIC(x) != NMAGIC         \
 114                         && N_MAGIC(x) != ZMAGIC)
 115
 116
 117
 118 #define N_DATADDR(x) \
 119     (N_MAGIC(x)==OMAGIC? (N_TXTADDR(x)+(x).a_text) \
 120      :  (N_SEGSIZE(x) + ((N_TXTADDR(x)+(x).a_text-1) & ~(N_SEGSIZE(x)-1))))
 121
 122 #define N_BSSADDR(x) (N_DATADDR(x) + (x).a_data)
 123
 124
 125 #define N_DATOFF(x)     ( N_TXTOFF(x) + (x).a_text )
 126 #define N_TRELOFF(x)    ( N_DATOFF(x) + (x).a_data )
 127 #define N_DRELOFF(x)    ( N_TRELOFF(x) + (x).a_trsize )
 128 #define N_SYMOFF(x)     ( N_DRELOFF(x) + (x).a_drsize )
 129 #define N_STROFF(x)     ( N_SYMOFF(x) + (x).a_syms )
 130
 131
 132 /* Symbols */
 133 struct external_nlist {
 134   bfd_byte e_strx[BYTES_IN_WORD]; /* index into string table of symbol name     */
 135   bfd_byte e_type[1];          /* type of symbol                                */
 136   bfd_byte e_other[1];         /* misc info (usually empty)                     */
 137   bfd_byte e_desc[2];          /* description field                             */
 138   bfd_byte e_value[BYTES_IN_WORD];/* value of symbol                            */
 139 };
 140
 141 #define EXTERNAL_LIST_SIZE (BYTES_IN_WORD+4+BYTES_IN_WORD)
 142 struct internal_nlist {
 143   char *strx;                           /* index into string table of symbol name       */
 144   uint8_type n_type;                    /* type of symbol                               */
 145   uint8_type n_other;                   /* misc info (usually empty)                    */
 146   uint16_type n_desc;                   /* description field                            */
 147   bfd_vma n_value;                      /* value of symbol                              */
 148 };
 149
 150 /* The n_type field is packed :
 151
 152   7 6 5 4 3 2 1 0
 153                 ^-      if set the symbol is externaly visible
 154                 0       local
 155                 1       N_EXT external
 156           ^ ^ ^----     select which section the symbol belongs to
 157         0 0 0 0 x        N_UNDF, undefined
 158         0 0 0 1 x        N_ABS,  no section, base at 0
 159         0 0 1 0 x        N_TEXT, text section
 160         0 0 1 1 x        N_DATA, data section
 161         0 1 0 0 x        N_BSS,  bss section
 162         ^----------     if set the symbol is a set element
 163         1 0 1 0 x        N_SETA absolute set element symbol
 164         1 0 1 1 x        N_SETT text set element symbol
 165         1 1 0 0 x        N_SETD data set element symbol
 166         1 1 0 1 x        N_SETB bss set element symbol
 167         1 1 1 0 x        N_SETV pointer to set vector in data area
 168         1 1 1 1 0        N_TYPE mask for all of the above
 169
 170   1 1 1 0 0 0 0 0        N_STAB type is a stab
 171 */
 172
 173 #define N_UNDF  0
 174 #define N_ABS   2
 175 #define N_TEXT  4
 176 #define N_DATA  6
 177 #define N_BSS   8
 178 #define N_FN    0x0e
 179 #define N_COMM  0x12    /* Common symbol (visible after shared lib dynlink) */
 180 #define N_EXT   1
 181 #define N_TYPE  0x1e
 182 #define N_STAB  0xe0
 183
 184 #define N_INDR 0x0a
 185
 186 /* The following symbols refer to set elements.
 187    All the N_SET[ATDB] symbols with the same name form one set.
 188    Space is allocated for the set in the text section, and each set
 189    elements value is stored into one word of the space.
 190    The first word of the space is the length of the set (number of elements).
 191
 192    The address of the set is made into an N_SETV symbol
 193    whose name is the same as the name of the set.
 194    This symbol acts like a N_DATA global symbol
 195    in that it can satisfy undefined external references.  */
 196
 197 /* These appear as input to LD, in a .o file.  */
 198 #define N_SETA  0x14            /* Absolute set element symbol */
 199 #define N_SETT  0x16            /* Text set element symbol */
 200 #define N_SETD  0x18            /* Data set element symbol */
 201 #define N_SETB  0x1A            /* Bss set element symbol */
 202
 203 /* This is output from LD.  */
 204 #define N_SETV  0x1C            /* Pointer to set vector in data area.  */
 205
 206 /* Warning symbol. The text gives a warning message, the next symbol
 207    in the table will be undefined. When the symbol is referenced, the
 208    message is printed.  */
 209
 210 #define N_WARNING 0x1e
 211
 212 /* Relocations
 213
 214   There are two types of relocation flavours for a.out systems,
 215   standard and extended. The standard form is used on systems where
 216   the instruction has room for all the bits of an offset to the operand, whilst the
 217   extended form is used when an address operand has to be split over n
 218   instructions. Eg, on the 68k, each move instruction can reference
 219   the target with a displacement of 16 or 32 bits. On the sparc, move
 220   instructions use an offset of 14 bits, so the offset is stored in
 221   the reloc field, and the data in the section is ignored.
 222 */
 223
 224 /* This structure describes a single relocation to be performed.
 225    The text-relocation section of the file is a vector of these structures,
 226    all of which apply to the text section.
 227    Likewise, the data-relocation section applies to the data section.  */
 228
 229 struct reloc_std_external {
 230   bfd_byte      r_address[BYTES_IN_WORD];       /* offset of of data to relocate        */
 231   bfd_byte r_index[3];  /* symbol table index of symbol         */
 232   bfd_byte r_type[1];   /* relocation type                      */
 233 };
 234
 235 #define RELOC_STD_BITS_PCREL_BIG        0x80
 236 #define RELOC_STD_BITS_PCREL_LITTLE     0x01
 237
 238 #define RELOC_STD_BITS_LENGTH_BIG       0x60
 239 #define RELOC_STD_BITS_LENGTH_SH_BIG    5       /* To shift to units place */
 240 #define RELOC_STD_BITS_LENGTH_LITTLE    0x06
 241 #define RELOC_STD_BITS_LENGTH_SH_LITTLE 1
 242
 243 #define RELOC_STD_BITS_EXTERN_BIG       0x10
 244 #define RELOC_STD_BITS_EXTERN_LITTLE    0x08
 245
 246 #define RELOC_STD_BITS_BASEREL_BIG      0x08
 247 #define RELOC_STD_BITS_BASEREL_LITTLE   0x08
 248
 249 #define RELOC_STD_BITS_JMPTABLE_BIG     0x04
 250 #define RELOC_STD_BITS_JMPTABLE_LITTLE  0x04
 251
 252 #define RELOC_STD_BITS_RELATIVE_BIG     0x02
 253 #define RELOC_STD_BITS_RELATIVE_LITTLE  0x02
 254
 255 #define RELOC_STD_SIZE  (BYTES_IN_WORD + 3 + 1)         /* Bytes per relocation entry */
 256
 257 struct reloc_std_internal
 258 {
 259   bfd_vma r_address;            /* Address (within segment) to be relocated.  */
 260   /* The meaning of r_symbolnum depends on r_extern.  */
 261   unsigned int r_symbolnum:24;
 262   /* Nonzero means value is a pc-relative offset
 263      and it should be relocated for changes in its own address
 264      as well as for changes in the symbol or section specified.  */
 265   unsigned int r_pcrel:1;
 266   /* Length (as exponent of 2) of the field to be relocated.
 267      Thus, a value of 2 indicates 1<<2 bytes.  */
 268   unsigned int r_length:2;
 269   /* 1 => relocate with value of symbol.
 270      r_symbolnum is the index of the symbol
 271      in files the symbol table.
 272      0 => relocate with the address of a segment.
 273      r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS
 274      (the N_EXT bit may be set also, but signifies nothing).  */
 275   unsigned int r_extern:1;
 276   /* The next three bits are for SunOS shared libraries, and seem to
 277      be undocumented.  */
 278   unsigned int r_baserel:1;     /* Linkage table relative */
 279   unsigned int r_jmptable:1;    /* pc-relative to jump table */
 280   unsigned int r_relative:1;    /* "relative relocation" */
 281   /* unused */
 282   unsigned int r_pad:1;         /* Padding -- set to zero */
 283 };
 284
 285
 286 /* EXTENDED RELOCS  */
 287
 288 struct reloc_ext_external {
 289   bfd_byte r_address[BYTES_IN_WORD];    /* offset of of data to relocate        */
 290   bfd_byte r_index[3];  /* symbol table index of symbol         */
 291   bfd_byte r_type[1];   /* relocation type                      */
 292   bfd_byte r_addend[BYTES_IN_WORD];     /* datum addend                         */
 293 };
 294
 295 #define RELOC_EXT_BITS_EXTERN_BIG       0x80
 296 #define RELOC_EXT_BITS_EXTERN_LITTLE    0x01
 297
 298 #define RELOC_EXT_BITS_TYPE_BIG         0x1F
 299 #define RELOC_EXT_BITS_TYPE_SH_BIG      0
 300 #define RELOC_EXT_BITS_TYPE_LITTLE      0xF8
 301 #define RELOC_EXT_BITS_TYPE_SH_LITTLE   3
 302
 303 #define RELOC_EXT_SIZE  (BYTES_IN_WORD + 3 + 1 + BYTES_IN_WORD) /* Bytes per relocation entry */
 304
 305 enum reloc_type
 306 {
 307
 308
 309
 310
 311
 312   /* simple relocations */
 313   RELOC_8,                      /* data[0:7] = addend + sv              */
 314   RELOC_16,                     /* data[0:15] = addend + sv             */
 315   RELOC_32,                     /* data[0:31] = addend + sv             */
 316   /* pc-rel displacement */
 317   RELOC_DISP8,                  /* data[0:7] = addend - pc + sv         */
 318   RELOC_DISP16,                 /* data[0:15] = addend - pc + sv        */
 319   RELOC_DISP32,                 /* data[0:31] = addend - pc + sv        */
 320   /* Special */
 321   RELOC_WDISP30,                /* data[0:29] = (addend + sv - pc)>>2   */
 322   RELOC_WDISP22,                /* data[0:21] = (addend + sv - pc)>>2   */
 323   RELOC_HI22,                   /* data[0:21] = (addend + sv)>>10       */
 324   RELOC_22,                     /* data[0:21] = (addend + sv)           */
 325   RELOC_13,                     /* data[0:12] = (addend + sv)           */
 326   RELOC_LO10,                   /* data[0:9] = (addend + sv)            */
 327   RELOC_SFA_BASE,
 328   RELOC_SFA_OFF13,
 329   /* P.I.C. (base-relative) */
 330   RELOC_BASE10,                 /* Not sure - maybe we can do this the */
 331   RELOC_BASE13,                 /* right way now */
 332   RELOC_BASE22,
 333   /* for some sort of pc-rel P.I.C. (?) */
 334   RELOC_PC10,
 335   RELOC_PC22,
 336   /* P.I.C. jump table */
 337   RELOC_JMP_TBL,
 338   /* reputedly for shared libraries somehow */
 339   RELOC_SEGOFF16,
 340   RELOC_GLOB_DAT,
 341   RELOC_JMP_SLOT,
 342   RELOC_RELATIVE,
 343
 344   RELOC_11,
 345   RELOC_WDISP2_14,
 346   RELOC_WDISP19,
 347   RELOC_HHI22,                  /* data[0:21] = (addend + sv) >> 42     */
 348   RELOC_HLO10,                  /* data[0:9] = (addend + sv) >> 32      */
 349
 350   /* 29K relocation types */
 351   RELOC_JUMPTARG,
 352   RELOC_CONST,
 353   RELOC_CONSTH,
 354
 355   /* All the new ones I can think of *//*v9*/
 356
 357   RELOC_64,                     /* data[0:63] = addend + sv             *//*v9*/
 358   RELOC_DISP64,                 /* data[0:63] = addend - pc + sv        *//*v9*/
 359   RELOC_WDISP21,                /* data[0:20] = (addend + sv - pc)>>2   *//*v9*/
 360   RELOC_DISP21,                 /* data[0:20] = addend - pc + sv        *//*v9*/
 361   RELOC_DISP14,                 /* data[0:13] = addend - pc + sv        *//*v9*/
 362   /* Q .
 363      What are the other ones,
 364      Since this is a clean slate, can we throw away the ones we dont
 365      understand ? Should we sort the values ? What about using a
 366      microcode format like the 68k ?
 367      */
 368   NO_RELOC
 369   };
 370
 371
 372 struct reloc_internal {
 373   bfd_vma r_address;            /* offset of of data to relocate        */
 374   long  r_index;                /* symbol table index of symbol         */
 375   enum reloc_type r_type;       /* relocation type                      */
 376   bfd_vma r_addend;             /* datum addend                         */
 377 };
 378
 379 /* Q.
 380    Should the length of the string table be 4 bytes or 8 bytes ?
 381
 382    Q.
 383    What about archive indexes ?
 384
 385  */
 386
 387 #endif                          /* __A_OUT_GNU_H__ */