include/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 struct external_exec
   9 {
  10   bfd_byte e_info[4];           /* magic number and stuff               */
  11   bfd_byte e_text[BYTES_IN_WORD]; /* length of text section in bytes    */
  12   bfd_byte e_data[BYTES_IN_WORD]; /* length of data section in bytes    */
  13   bfd_byte e_bss[BYTES_IN_WORD]; /* length of bss area in bytes                 */
  14   bfd_byte e_syms[BYTES_IN_WORD]; /* length of symbol table in bytes    */
  15   bfd_byte e_entry[BYTES_IN_WORD]; /* start address                     */
  16   bfd_byte e_trsize[BYTES_IN_WORD]; /* length of text relocation info   */
  17   bfd_byte e_drsize[BYTES_IN_WORD]; /* length of data relocation info   */
  18 };
  19
  20 #define EXEC_BYTES_SIZE (4 + BYTES_IN_WORD * 7)
  21
  22 /* By default, segment size is constant.  But on some machines, it can
  23    be a function of the a.out header (e.g. machine type).  */
  24 #ifndef N_SEGSIZE
  25 #define N_SEGSIZE(x)    SEGMENT_SIZE
  26 #endif
  27
  28 #define _N_HDROFF(x)    (N_SEGSIZE(x) - EXEC_BYTES_SIZE)
  29 /* address in an a.out of the text section. When demand paged, it's
  30  set up a bit to make nothing at 0, when an object file it's 0.
  31  There's a special hack case when the entry point is < TEXT_START_ADDR
  32  for executables, then the real start is 0
  33 */
  34
  35 #define N_TXTADDR(x) \
  36     (N_MAGIC(x)==OMAGIC? 0 \
  37      : (N_MAGIC(x) == ZMAGIC && (x).a_entry < TEXT_START_ADDR)? 0 \
  38      : TEXT_START_ADDR)
  39
  40 /* offset in an a.out of the start of the text section. When demand
  41    paged, this is the start of the file
  42 */
  43
  44 #define N_TXTOFF(x)     ( (N_MAGIC((x)) == ZMAGIC) ? 0 : EXEC_BYTES_SIZE)
  45 #if ARCH_SIZE==64
  46 #define PAGE_SIZE 0x2000
  47 #define OMAGIC 0x1001           /* Code indicating object file  */
  48 #define ZMAGIC 0x1002           /* Code indicating demand-paged executable.  */
  49 #define NMAGIC 0x1003           /* Code indicating pure executable.  */
  50 #else
  51 #ifndef PAGE_SIZE
  52 #define PAGE_SIZE 0x2000
  53 #endif
  54 #define OMAGIC 0407             /* Code indicating object file or impure executable.  */
  55 #define NMAGIC 0410             /* Code indicating pure executable.  */
  56 #define ZMAGIC 0413             /* Code indicating demand-paged executable.  */
  57 #endif
  58
  59 #define N_BADMAG(x)       (N_MAGIC(x) != OMAGIC         \
  60                         && N_MAGIC(x) != NMAGIC         \
  61                         && N_MAGIC(x) != ZMAGIC)
  62
  63
  64
  65 #define N_DATADDR(x) \
  66     (N_MAGIC(x)==OMAGIC? (N_TXTADDR(x)+(x).a_text) \
  67      :  (N_SEGSIZE(x) + ((N_TXTADDR(x)+(x).a_text-1) & ~(N_SEGSIZE(x)-1))))
  68
  69 #define N_BSSADDR(x) (N_DATADDR(x) + (x).a_data)
  70
  71
  72 #define N_DATOFF(x)     ( N_TXTOFF(x) + (x).a_text )
  73 #define N_TRELOFF(x)    ( N_DATOFF(x) + (x).a_data )
  74 #define N_DRELOFF(x)    ( N_TRELOFF(x) + (x).a_trsize )
  75 #define N_SYMOFF(x)     ( N_DRELOFF(x) + (x).a_drsize )
  76 #define N_STROFF(x)     ( N_SYMOFF(x) + (x).a_syms )
  77
  78
  79 /* Symbols */
  80 struct external_nlist {
  81   bfd_byte e_strx[BYTES_IN_WORD];       /* index into string table of name */
  82   bfd_byte e_type[1];                   /* type of symbol */
  83   bfd_byte e_other[1];                  /* misc info (usually empty) */
  84   bfd_byte e_desc[2];                   /* description field */
  85   bfd_byte e_value[BYTES_IN_WORD];      /* value of symbol */
  86 };
  87
  88 #define EXTERNAL_NLIST_SIZE (BYTES_IN_WORD+4+BYTES_IN_WORD)
  89
  90 struct internal_nlist {
  91   unsigned long n_strx;                 /* index into string table of name */
  92   unsigned char n_type;                 /* type of symbol */
  93   unsigned char n_other;                /* misc info (usually empty) */
  94   unsigned short n_desc;                /* description field */
  95   bfd_vma n_value;                      /* value of symbol */
  96 };
  97
  98 /* The n_type field is the symbol type, containing:  */
  99
 100 #define N_UNDF  0       /* Undefined symbol */
 101 #define N_ABS   2       /* Absolute symbol -- defined at particular addr */
 102 #define N_TEXT  4       /* Text sym -- defined at offset in text seg */
 103 #define N_DATA  6       /* Data sym -- defined at offset in data seg */
 104 #define N_BSS   8       /* BSS  sym -- defined at offset in zero'd seg */
 105 #define N_COMM  0x12    /* Common symbol (visible after shared lib dynlink) */
 106 #define N_FN    0x1f    /* File name of .o file */
 107 /* Note: N_EXT can only be usefully OR-ed with N_UNDF, N_ABS, N_TEXT,
 108    N_DATA, or N_BSS.  When the low-order bit of other types is set,
 109    (e.g. N_WARNING versus N_FN), they are two different types.  */
 110 #define N_EXT   1       /* External symbol (as opposed to local-to-this-file) */
 111 #define N_TYPE  0x1e
 112 #define N_STAB  0xe0    /* If any of these bits are on, it's a debug symbol */
 113
 114 #define N_INDR 0x0a
 115
 116 /* The following symbols refer to set elements.
 117    All the N_SET[ATDB] symbols with the same name form one set.
 118    Space is allocated for the set in the text section, and each set
 119    elements value is stored into one word of the space.
 120    The first word of the space is the length of the set (number of elements).
 121
 122    The address of the set is made into an N_SETV symbol
 123    whose name is the same as the name of the set.
 124    This symbol acts like a N_DATA global symbol
 125    in that it can satisfy undefined external references.  */
 126
 127 /* These appear as input to LD, in a .o file.  */
 128 #define N_SETA  0x14            /* Absolute set element symbol */
 129 #define N_SETT  0x16            /* Text set element symbol */
 130 #define N_SETD  0x18            /* Data set element symbol */
 131 #define N_SETB  0x1A            /* Bss set element symbol */
 132
 133 /* This is output from LD.  */
 134 #define N_SETV  0x1C            /* Pointer to set vector in data area.  */
 135
 136 /* Warning symbol. The text gives a warning message, the next symbol
 137    in the table will be undefined. When the symbol is referenced, the
 138    message is printed.  */
 139
 140 #define N_WARNING 0x1e
 141
 142 /* Relocations
 143
 144   There are two types of relocation flavours for a.out systems,
 145   standard and extended. The standard form is used on systems where the
 146   instruction has room for all the bits of an offset to the operand, whilst
 147   the extended form is used when an address operand has to be split over n
 148   instructions. Eg, on the 68k, each move instruction can reference
 149   the target with a displacement of 16 or 32 bits. On the sparc, move
 150   instructions use an offset of 14 bits, so the offset is stored in
 151   the reloc field, and the data in the section is ignored.
 152 */
 153
 154 /* This structure describes a single relocation to be performed.
 155    The text-relocation section of the file is a vector of these structures,
 156    all of which apply to the text section.
 157    Likewise, the data-relocation section applies to the data section.  */
 158
 159 struct reloc_std_external {
 160   bfd_byte      r_address[BYTES_IN_WORD];       /* offset of of data to relocate        */
 161   bfd_byte r_index[3];  /* symbol table index of symbol         */
 162   bfd_byte r_type[1];   /* relocation type                      */
 163 };
 164
 165 #define RELOC_STD_BITS_PCREL_BIG        0x80
 166 #define RELOC_STD_BITS_PCREL_LITTLE     0x01
 167
 168 #define RELOC_STD_BITS_LENGTH_BIG       0x60
 169 #define RELOC_STD_BITS_LENGTH_SH_BIG    5       /* To shift to units place */
 170 #define RELOC_STD_BITS_LENGTH_LITTLE    0x06
 171 #define RELOC_STD_BITS_LENGTH_SH_LITTLE 1
 172
 173 #define RELOC_STD_BITS_EXTERN_BIG       0x10
 174 #define RELOC_STD_BITS_EXTERN_LITTLE    0x08
 175
 176 #define RELOC_STD_BITS_BASEREL_BIG      0x08
 177 #define RELOC_STD_BITS_BASEREL_LITTLE   0x08
 178
 179 #define RELOC_STD_BITS_JMPTABLE_BIG     0x04
 180 #define RELOC_STD_BITS_JMPTABLE_LITTLE  0x04
 181
 182 #define RELOC_STD_BITS_RELATIVE_BIG     0x02
 183 #define RELOC_STD_BITS_RELATIVE_LITTLE  0x02
 184
 185 #define RELOC_STD_SIZE  (BYTES_IN_WORD + 3 + 1)         /* Bytes per relocation entry */
 186
 187 struct reloc_std_internal
 188 {
 189   bfd_vma r_address;            /* Address (within segment) to be relocated.  */
 190   /* The meaning of r_symbolnum depends on r_extern.  */
 191   unsigned int r_symbolnum:24;
 192   /* Nonzero means value is a pc-relative offset
 193      and it should be relocated for changes in its own address
 194      as well as for changes in the symbol or section specified.  */
 195   unsigned int r_pcrel:1;
 196   /* Length (as exponent of 2) of the field to be relocated.
 197      Thus, a value of 2 indicates 1<<2 bytes.  */
 198   unsigned int r_length:2;
 199   /* 1 => relocate with value of symbol.
 200      r_symbolnum is the index of the symbol
 201      in files the symbol table.
 202      0 => relocate with the address of a segment.
 203      r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS
 204      (the N_EXT bit may be set also, but signifies nothing).  */
 205   unsigned int r_extern:1;
 206   /* The next three bits are for SunOS shared libraries, and seem to
 207      be undocumented.  */
 208   unsigned int r_baserel:1;     /* Linkage table relative */
 209   unsigned int r_jmptable:1;    /* pc-relative to jump table */
 210   unsigned int r_relative:1;    /* "relative relocation" */
 211   /* unused */
 212   unsigned int r_pad:1;         /* Padding -- set to zero */
 213 };
 214
 215
 216 /* EXTENDED RELOCS  */
 217
 218 struct reloc_ext_external {
 219   bfd_byte r_address[BYTES_IN_WORD];    /* offset of of data to relocate        */
 220   bfd_byte r_index[3];  /* symbol table index of symbol         */
 221   bfd_byte r_type[1];   /* relocation type                      */
 222   bfd_byte r_addend[BYTES_IN_WORD];     /* datum addend                         */
 223 };
 224
 225 #define RELOC_EXT_BITS_EXTERN_BIG       0x80
 226 #define RELOC_EXT_BITS_EXTERN_LITTLE    0x01
 227
 228 #define RELOC_EXT_BITS_TYPE_BIG         0x1F
 229 #define RELOC_EXT_BITS_TYPE_SH_BIG      0
 230 #define RELOC_EXT_BITS_TYPE_LITTLE      0xF8
 231 #define RELOC_EXT_BITS_TYPE_SH_LITTLE   3
 232
 233 /* Bytes per relocation entry */
 234 #define RELOC_EXT_SIZE  (BYTES_IN_WORD + 3 + 1 + BYTES_IN_WORD)
 235
 236 enum reloc_type
 237 {
 238   /* simple relocations */
 239   RELOC_8,                      /* data[0:7] = addend + sv              */
 240   RELOC_16,                     /* data[0:15] = addend + sv             */
 241   RELOC_32,                     /* data[0:31] = addend + sv             */
 242   /* pc-rel displacement */
 243   RELOC_DISP8,                  /* data[0:7] = addend - pc + sv         */
 244   RELOC_DISP16,                 /* data[0:15] = addend - pc + sv        */
 245   RELOC_DISP32,                 /* data[0:31] = addend - pc + sv        */
 246   /* Special */
 247   RELOC_WDISP30,                /* data[0:29] = (addend + sv - pc)>>2   */
 248   RELOC_WDISP22,                /* data[0:21] = (addend + sv - pc)>>2   */
 249   RELOC_HI22,                   /* data[0:21] = (addend + sv)>>10       */
 250   RELOC_22,                     /* data[0:21] = (addend + sv)           */
 251   RELOC_13,                     /* data[0:12] = (addend + sv)           */
 252   RELOC_LO10,                   /* data[0:9] = (addend + sv)            */
 253   RELOC_SFA_BASE,
 254   RELOC_SFA_OFF13,
 255   /* P.I.C. (base-relative) */
 256   RELOC_BASE10,                 /* Not sure - maybe we can do this the */
 257   RELOC_BASE13,                 /* right way now */
 258   RELOC_BASE22,
 259   /* for some sort of pc-rel P.I.C. (?) */
 260   RELOC_PC10,
 261   RELOC_PC22,
 262   /* P.I.C. jump table */
 263   RELOC_JMP_TBL,
 264   /* reputedly for shared libraries somehow */
 265   RELOC_SEGOFF16,
 266   RELOC_GLOB_DAT,
 267   RELOC_JMP_SLOT,
 268   RELOC_RELATIVE,
 269
 270   RELOC_11,
 271   RELOC_WDISP2_14,
 272   RELOC_WDISP19,
 273   RELOC_HHI22,                  /* data[0:21] = (addend + sv) >> 42     */
 274   RELOC_HLO10,                  /* data[0:9] = (addend + sv) >> 32      */
 275
 276   /* 29K relocation types */
 277   RELOC_JUMPTARG,
 278   RELOC_CONST,
 279   RELOC_CONSTH,
 280
 281   /* All the new ones I can think of *//*v9*/
 282
 283   RELOC_64,                     /* data[0:63] = addend + sv             *//*v9*/
 284   RELOC_DISP64,                 /* data[0:63] = addend - pc + sv        *//*v9*/
 285   RELOC_WDISP21,                /* data[0:20] = (addend + sv - pc)>>2   *//*v9*/
 286   RELOC_DISP21,                 /* data[0:20] = addend - pc + sv        *//*v9*/
 287   RELOC_DISP14,                 /* data[0:13] = addend - pc + sv        *//*v9*/
 288   /* Q .
 289      What are the other ones,
 290      Since this is a clean slate, can we throw away the ones we dont
 291      understand ? Should we sort the values ? What about using a
 292      microcode format like the 68k ?
 293      */
 294   NO_RELOC
 295   };
 296
 297
 298 struct reloc_internal {
 299   bfd_vma r_address;            /* offset of of data to relocate        */
 300   long  r_index;                /* symbol table index of symbol         */
 301   enum reloc_type r_type;       /* relocation type                      */
 302   bfd_vma r_addend;             /* datum addend                         */
 303 };
 304
 305 /* Q.
 306    Should the length of the string table be 4 bytes or 8 bytes ?
 307
 308    Q.
 309    What about archive indexes ?
 310
 311  */
 312
 313 #endif                          /* __A_OUT_64_H__ */