include/aout/adobe.h

   1 /* `a.out.adobe' differences from standard a.out files */
   2
   3 #ifndef __A_OUT_ADOBE_H__
   4 #define __A_OUT_ADOBE_H__
   5
   6 #define BYTES_IN_WORD   4
   7
   8 /* Struct external_exec is the same.  */
   9
  10 /* This is the layout on disk of the 32-bit or 64-bit exec header. */
  11
  12 struct external_exec
  13 {
  14   bfd_byte e_info[4];           /* magic number and stuff               */
  15   bfd_byte e_text[BYTES_IN_WORD]; /* length of text section in bytes    */
  16   bfd_byte e_data[BYTES_IN_WORD]; /* length of data section in bytes    */
  17   bfd_byte e_bss[BYTES_IN_WORD]; /* length of bss area in bytes                 */
  18   bfd_byte e_syms[BYTES_IN_WORD]; /* length of symbol table in bytes    */
  19   bfd_byte e_entry[BYTES_IN_WORD]; /* start address                     */
  20   bfd_byte e_trsize[BYTES_IN_WORD]; /* length of text relocation info   */
  21   bfd_byte e_drsize[BYTES_IN_WORD]; /* length of data relocation info   */
  22 };
  23
  24 #define EXEC_BYTES_SIZE (4 + BYTES_IN_WORD * 7)
  25
  26 /* Magic numbers for a.out files */
  27
  28 #undef  ZMAGIC
  29 #define ZMAGIC  0xAD0BE         /* Cute, eh?  */
  30 #undef  OMAGIC
  31 #undef  NMAGIC
  32
  33 #define N_BADMAG(x)       ((x).a_info != ZMAGIC)
  34
  35 /* By default, segment size is constant.  But some machines override this
  36    to be a function of the a.out header (e.g. machine type).  */
  37 #ifndef N_SEGSIZE
  38 #define N_SEGSIZE(x)    SEGMENT_SIZE
  39 #endif
  40 #undef N_SEGSIZE   /* FIXMEXXXX */
  41
  42 /* Segment information for the a.out.Adobe format is specified after the
  43    file header.  It contains N segment descriptors, followed by one with
  44    a type of zero.
  45
  46    The actual text of the segments starts at N_TXTOFF in the file,
  47    regardless of how many or how few segment headers there are.  */
  48
  49 struct external_segdesc {
  50         unsigned char e_type[1];
  51         unsigned char e_size[3];
  52         unsigned char e_virtbase[4];
  53         unsigned char e_filebase[4];
  54 };
  55
  56 struct internal_segdesc {
  57         unsigned int    a_type:8;       /* Segment type N_TEXT, N_DATA, 0 */
  58         unsigned int    a_size:24;      /* Segment size */
  59         bfd_vma         a_virtbase;     /* Virtual address */
  60         unsigned int    a_filebase;     /* Base address in object file */
  61 };
  62
  63 #define N_TXTADDR(x) \
  64
  65 /* This is documented to be at 1024, but appears to really be at 2048.
  66    FIXME?!  */
  67 #define N_TXTOFF(x)     2048
  68
  69 #define N_TXTSIZE(x) ((x).a_text)
  70
  71 #define N_DATADDR(x)
  72
  73 #define N_BSSADDR(x)
  74
  75 /* Offsets of the various portions of the file after the text segment.  */
  76
  77 #define N_DATOFF(x)     ( N_TXTOFF(x) + N_TXTSIZE(x) )
  78 #define N_TRELOFF(x)    ( N_DATOFF(x) + (x).a_data )
  79 #define N_DRELOFF(x)    ( N_TRELOFF(x) + (x).a_trsize )
  80 #define N_SYMOFF(x)     ( N_DRELOFF(x) + (x).a_drsize )
  81 #define N_STROFF(x)     ( N_SYMOFF(x) + (x).a_syms )
  82 \f
  83 /* Symbols */
  84 struct external_nlist {
  85   bfd_byte e_strx[BYTES_IN_WORD];       /* index into string table of name */
  86   bfd_byte e_type[1];                   /* type of symbol */
  87   bfd_byte e_other[1];                  /* misc info (usually empty) */
  88   bfd_byte e_desc[2];                   /* description field */
  89   bfd_byte e_value[BYTES_IN_WORD];      /* value of symbol */
  90 };
  91
  92 #define EXTERNAL_NLIST_SIZE (BYTES_IN_WORD+4+BYTES_IN_WORD)
  93
  94 struct internal_nlist {
  95   unsigned long n_strx;                 /* index into string table of name */
  96   unsigned char n_type;                 /* type of symbol */
  97   unsigned char n_other;                /* misc info (usually empty) */
  98   unsigned short n_desc;                /* description field */
  99   bfd_vma n_value;                      /* value of symbol */
 100 };
 101
 102 /* The n_type field is the symbol type, containing:  */
 103
 104 #define N_UNDF  0       /* Undefined symbol */
 105 #define N_ABS   2       /* Absolute symbol -- defined at particular addr */
 106 #define N_TEXT  4       /* Text sym -- defined at offset in text seg */
 107 #define N_DATA  6       /* Data sym -- defined at offset in data seg */
 108 #define N_BSS   8       /* BSS  sym -- defined at offset in zero'd seg */
 109 #define N_COMM  0x12    /* Common symbol (visible after shared lib dynlink) */
 110 #define N_FN    0x1f    /* File name of .o file */
 111 #define N_FN_SEQ 0x0C   /* N_FN from Sequent compilers (sigh) */
 112 /* Note: N_EXT can only be usefully OR-ed with N_UNDF, N_ABS, N_TEXT,
 113    N_DATA, or N_BSS.  When the low-order bit of other types is set,
 114    (e.g. N_WARNING versus N_FN), they are two different types.  */
 115 #define N_EXT   1       /* External symbol (as opposed to local-to-this-file) */
 116 #define N_TYPE  0x1e
 117 #define N_STAB  0xe0    /* If any of these bits are on, it's a debug symbol */
 118
 119 #define N_INDR 0x0a
 120
 121 /* The following symbols refer to set elements.
 122    All the N_SET[ATDB] symbols with the same name form one set.
 123    Space is allocated for the set in the text section, and each set
 124    elements value is stored into one word of the space.
 125    The first word of the space is the length of the set (number of elements).
 126
 127    The address of the set is made into an N_SETV symbol
 128    whose name is the same as the name of the set.
 129    This symbol acts like a N_DATA global symbol
 130    in that it can satisfy undefined external references.  */
 131
 132 /* These appear as input to LD, in a .o file.  */
 133 #define N_SETA  0x14            /* Absolute set element symbol */
 134 #define N_SETT  0x16            /* Text set element symbol */
 135 #define N_SETD  0x18            /* Data set element symbol */
 136 #define N_SETB  0x1A            /* Bss set element symbol */
 137
 138 /* This is output from LD.  */
 139 #define N_SETV  0x1C            /* Pointer to set vector in data area.  */
 140
 141 /* Warning symbol. The text gives a warning message, the next symbol
 142    in the table will be undefined. When the symbol is referenced, the
 143    message is printed.  */
 144
 145 #define N_WARNING 0x1e
 146
 147 /* Relocations
 148
 149   There are two types of relocation flavours for a.out systems,
 150   standard and extended. The standard form is used on systems where the
 151   instruction has room for all the bits of an offset to the operand, whilst
 152   the extended form is used when an address operand has to be split over n
 153   instructions. Eg, on the 68k, each move instruction can reference
 154   the target with a displacement of 16 or 32 bits. On the sparc, move
 155   instructions use an offset of 14 bits, so the offset is stored in
 156   the reloc field, and the data in the section is ignored.
 157 */
 158
 159 /* This structure describes a single relocation to be performed.
 160    The text-relocation section of the file is a vector of these structures,
 161    all of which apply to the text section.
 162    Likewise, the data-relocation section applies to the data section.  */
 163
 164 struct reloc_std_external {
 165   bfd_byte r_address[BYTES_IN_WORD];    /* offset of of data to relocate */
 166   bfd_byte r_index[3];  /* symbol table index of symbol         */
 167   bfd_byte r_type[1];   /* relocation type                      */
 168 };
 169
 170 #define RELOC_STD_BITS_PCREL_BIG        0x80
 171 #define RELOC_STD_BITS_PCREL_LITTLE     0x01
 172
 173 #define RELOC_STD_BITS_LENGTH_BIG       0x60
 174 #define RELOC_STD_BITS_LENGTH_SH_BIG    5       /* To shift to units place */
 175 #define RELOC_STD_BITS_LENGTH_LITTLE    0x06
 176 #define RELOC_STD_BITS_LENGTH_SH_LITTLE 1
 177
 178 #define RELOC_STD_BITS_EXTERN_BIG       0x10
 179 #define RELOC_STD_BITS_EXTERN_LITTLE    0x08
 180
 181 #define RELOC_STD_BITS_BASEREL_BIG      0x08
 182 #define RELOC_STD_BITS_BASEREL_LITTLE   0x08
 183
 184 #define RELOC_STD_BITS_JMPTABLE_BIG     0x04
 185 #define RELOC_STD_BITS_JMPTABLE_LITTLE  0x04
 186
 187 #define RELOC_STD_BITS_RELATIVE_BIG     0x02
 188 #define RELOC_STD_BITS_RELATIVE_LITTLE  0x02
 189
 190 #define RELOC_STD_SIZE  (BYTES_IN_WORD + 3 + 1)         /* Bytes per relocation entry */
 191
 192 struct reloc_std_internal
 193 {
 194   bfd_vma r_address;            /* Address (within segment) to be relocated.  */
 195   /* The meaning of r_symbolnum depends on r_extern.  */
 196   unsigned int r_symbolnum:24;
 197   /* Nonzero means value is a pc-relative offset
 198      and it should be relocated for changes in its own address
 199      as well as for changes in the symbol or section specified.  */
 200   unsigned int r_pcrel:1;
 201   /* Length (as exponent of 2) of the field to be relocated.
 202      Thus, a value of 2 indicates 1<<2 bytes.  */
 203   unsigned int r_length:2;
 204   /* 1 => relocate with value of symbol.
 205      r_symbolnum is the index of the symbol
 206      in files the symbol table.
 207      0 => relocate with the address of a segment.
 208      r_symbolnum is N_TEXT, N_DATA, N_BSS or N_ABS
 209      (the N_EXT bit may be set also, but signifies nothing).  */
 210   unsigned int r_extern:1;
 211   /* The next three bits are for SunOS shared libraries, and seem to
 212      be undocumented.  */
 213   unsigned int r_baserel:1;     /* Linkage table relative */
 214   unsigned int r_jmptable:1;    /* pc-relative to jump table */
 215   unsigned int r_relative:1;    /* "relative relocation" */
 216   /* unused */
 217   unsigned int r_pad:1;         /* Padding -- set to zero */
 218 };
 219
 220
 221 /* EXTENDED RELOCS  */
 222
 223 struct reloc_ext_external {
 224   bfd_byte r_address[BYTES_IN_WORD];    /* offset of of data to relocate        */
 225   bfd_byte r_index[3];  /* symbol table index of symbol         */
 226   bfd_byte r_type[1];   /* relocation type                      */
 227   bfd_byte r_addend[BYTES_IN_WORD];     /* datum addend                         */
 228 };
 229
 230 #define RELOC_EXT_BITS_EXTERN_BIG       0x80
 231 #define RELOC_EXT_BITS_EXTERN_LITTLE    0x01
 232
 233 #define RELOC_EXT_BITS_TYPE_BIG         0x1F
 234 #define RELOC_EXT_BITS_TYPE_SH_BIG      0
 235 #define RELOC_EXT_BITS_TYPE_LITTLE      0xF8
 236 #define RELOC_EXT_BITS_TYPE_SH_LITTLE   3
 237
 238 /* Bytes per relocation entry */
 239 #define RELOC_EXT_SIZE  (BYTES_IN_WORD + 3 + 1 + BYTES_IN_WORD)
 240
 241 enum reloc_type
 242 {
 243   /* simple relocations */
 244   RELOC_8,                      /* data[0:7] = addend + sv              */
 245   RELOC_16,                     /* data[0:15] = addend + sv             */
 246   RELOC_32,                     /* data[0:31] = addend + sv             */
 247   /* pc-rel displacement */
 248   RELOC_DISP8,                  /* data[0:7] = addend - pc + sv         */
 249   RELOC_DISP16,                 /* data[0:15] = addend - pc + sv        */
 250   RELOC_DISP32,                 /* data[0:31] = addend - pc + sv        */
 251   /* Special */
 252   RELOC_WDISP30,                /* data[0:29] = (addend + sv - pc)>>2   */
 253   RELOC_WDISP22,                /* data[0:21] = (addend + sv - pc)>>2   */
 254   RELOC_HI22,                   /* data[0:21] = (addend + sv)>>10       */
 255   RELOC_22,                     /* data[0:21] = (addend + sv)           */
 256   RELOC_13,                     /* data[0:12] = (addend + sv)           */
 257   RELOC_LO10,                   /* data[0:9] = (addend + sv)            */
 258   RELOC_SFA_BASE,
 259   RELOC_SFA_OFF13,
 260   /* P.I.C. (base-relative) */
 261   RELOC_BASE10,                 /* Not sure - maybe we can do this the */
 262   RELOC_BASE13,                 /* right way now */
 263   RELOC_BASE22,
 264   /* for some sort of pc-rel P.I.C. (?) */
 265   RELOC_PC10,
 266   RELOC_PC22,
 267   /* P.I.C. jump table */
 268   RELOC_JMP_TBL,
 269   /* reputedly for shared libraries somehow */
 270   RELOC_SEGOFF16,
 271   RELOC_GLOB_DAT,
 272   RELOC_JMP_SLOT,
 273   RELOC_RELATIVE,
 274
 275   RELOC_11,
 276   RELOC_WDISP2_14,
 277   RELOC_WDISP19,
 278   RELOC_HHI22,                  /* data[0:21] = (addend + sv) >> 42     */
 279   RELOC_HLO10,                  /* data[0:9] = (addend + sv) >> 32      */
 280
 281   /* 29K relocation types */
 282   RELOC_JUMPTARG,
 283   RELOC_CONST,
 284   RELOC_CONSTH,
 285
 286   NO_RELOC
 287   };
 288
 289
 290 struct reloc_internal {
 291   bfd_vma r_address;            /* offset of of data to relocate        */
 292   long  r_index;                /* symbol table index of symbol         */
 293   enum reloc_type r_type;       /* relocation type                      */
 294   bfd_vma r_addend;             /* datum addend                         */
 295 };
 296
 297 #endif                          /* __A_OUT_ADOBE_H__ */