include/coff/ecoff.h

   1 #ifndef ECOFF_H
   2 #define ECOFF_H
   3
   4 /* Generic ECOFF support.
   5    This does not include symbol information, found in sym.h and
   6    symconst.h.  */
   7
   8 /* Mips magic numbers used in filehdr.  MIPS_MAGIC_LITTLE is used on
   9    little endian machines.  MIPS_MAGIC_BIG is used on big endian
  10    machines.  Where is MIPS_MAGIC_1 from?  */
  11 #define MIPS_MAGIC_1 0x0180
  12 #define MIPS_MAGIC_LITTLE 0x0162
  13 #define MIPS_MAGIC_BIG 0x0160
  14
  15 /* Alpha magic numbers used in filehdr.  */
  16 #define ALPHA_MAGIC 0x183
  17
  18 /* Magic numbers used in a.out header.  */
  19 #define ECOFF_AOUT_OMAGIC 0407  /* not demand paged (ld -N).  */
  20 #define ECOFF_AOUT_ZMAGIC 0413  /* demand load format, eg normal ld output */
  21
  22 /* Names of special sections.  */
  23 #define _TEXT   ".text"
  24 #define _DATA   ".data"
  25 #define _BSS    ".bss"
  26 #define _RDATA  ".rdata"
  27 #define _SDATA  ".sdata"
  28 #define _SBSS   ".sbss"
  29 #define _LIT4   ".lit4"
  30 #define _LIT8   ".lit8"
  31 #define _LIB    ".lib"
  32 #define _INIT   ".init"
  33
  34 /* ECOFF uses some additional section flags.  */
  35 #define STYP_RDATA 0x100
  36 #define STYP_SDATA 0x200
  37 #define STYP_SBSS 0x400
  38 #define STYP_LIT8 0x8000000
  39 #define STYP_LIT4 0x10000000
  40 #define STYP_ECOFF_INIT 0x80000000
  41 #define STYP_OTHER_LOAD STYP_ECOFF_INIT
  42
  43 /* The linker needs a section to hold small common variables while
  44    linking.  There is no convenient way to create it when the linker
  45    needs it, so we always create one for each BFD.  We then avoid
  46    writing it out.  */
  47 #define SCOMMON ".scommon"
  48
  49 /* If the extern bit in a reloc is 1, then r_symndx is an index into
  50    the external symbol table.  If the extern bit is 0, then r_symndx
  51    indicates a section, and is one of the following values.  */
  52 #define RELOC_SECTION_NONE      0
  53 #define RELOC_SECTION_TEXT      1
  54 #define RELOC_SECTION_RDATA     2
  55 #define RELOC_SECTION_DATA      3
  56 #define RELOC_SECTION_SDATA     4
  57 #define RELOC_SECTION_SBSS      5
  58 #define RELOC_SECTION_BSS       6
  59 #define RELOC_SECTION_INIT      7
  60 #define RELOC_SECTION_LIT8      8
  61 #define RELOC_SECTION_LIT4      9
  62 #define RELOC_SECTION_XDATA    10
  63 #define RELOC_SECTION_PDATA    11
  64 #define RELOC_SECTION_FINI     12
  65 #define RELOC_SECTION_LITA     13
  66 #define RELOC_SECTION_ABS      14
  67
  68 /********************** STABS **********************/
  69
  70 /* gcc uses mips-tfile to output type information in special stabs
  71    entries.  These must match the corresponding definition in
  72    gcc/config/mips.h.  At some point, these should probably go into a
  73    shared include file, but currently gcc and gdb do not share any
  74    directories. */
  75 #define CODE_MASK 0x8F300
  76 #define ECOFF_IS_STAB(sym) (((sym)->index & 0xFFF00) == CODE_MASK)
  77 #define ECOFF_MARK_STAB(code) ((code)+CODE_MASK)
  78 #define ECOFF_UNMARK_STAB(code) ((code)-CODE_MASK)
  79 #define STABS_SYMBOL "@stabs"
  80
  81 /********************** COFF **********************/
  82
  83 /* gcc also uses mips-tfile to output COFF debugging information.
  84    These are the values it uses when outputting the .type directive.
  85    These should also be in a shared include file.  */
  86 #define N_BTMASK        (017)
  87 #define N_TMASK         (060)
  88 #define N_BTSHFT        (4)
  89 #define N_TSHIFT        (2)
  90
  91 /********************** AUX **********************/
  92
  93 /* The auxiliary type information is the same on all known ECOFF
  94    targets.  I can't see any reason that it would ever change, so I am
  95    going to gamble and define the external structures here, in the
  96    target independent ECOFF header file.  The internal forms are
  97    defined in coff/sym.h, which was originally donated by MIPS
  98    Computer Systems.  */
  99
 100 /* Type information external record */
 101
 102 struct tir_ext {
 103         unsigned char   t_bits1[1];
 104         unsigned char   t_tq45[1];
 105         unsigned char   t_tq01[1];
 106         unsigned char   t_tq23[1];
 107 };
 108
 109 #define TIR_BITS1_FBITFIELD_BIG         0x80
 110 #define TIR_BITS1_FBITFIELD_LITTLE      0x01
 111
 112 #define TIR_BITS1_CONTINUED_BIG         0x40
 113 #define TIR_BITS1_CONTINUED_LITTLE      0x02
 114
 115 #define TIR_BITS1_BT_BIG                0x3F
 116 #define TIR_BITS1_BT_SH_BIG             0
 117 #define TIR_BITS1_BT_LITTLE             0xFC
 118 #define TIR_BITS1_BT_SH_LITTLE          2
 119
 120 #define TIR_BITS_TQ4_BIG                0xF0
 121 #define TIR_BITS_TQ4_SH_BIG             4
 122 #define TIR_BITS_TQ5_BIG                0x0F
 123 #define TIR_BITS_TQ5_SH_BIG             0
 124 #define TIR_BITS_TQ4_LITTLE             0x0F
 125 #define TIR_BITS_TQ4_SH_LITTLE          0
 126 #define TIR_BITS_TQ5_LITTLE             0xF0
 127 #define TIR_BITS_TQ5_SH_LITTLE          4
 128
 129 #define TIR_BITS_TQ0_BIG                0xF0
 130 #define TIR_BITS_TQ0_SH_BIG             4
 131 #define TIR_BITS_TQ1_BIG                0x0F
 132 #define TIR_BITS_TQ1_SH_BIG             0
 133 #define TIR_BITS_TQ0_LITTLE             0x0F
 134 #define TIR_BITS_TQ0_SH_LITTLE          0
 135 #define TIR_BITS_TQ1_LITTLE             0xF0
 136 #define TIR_BITS_TQ1_SH_LITTLE          4
 137
 138 #define TIR_BITS_TQ2_BIG                0xF0
 139 #define TIR_BITS_TQ2_SH_BIG             4
 140 #define TIR_BITS_TQ3_BIG                0x0F
 141 #define TIR_BITS_TQ3_SH_BIG             0
 142 #define TIR_BITS_TQ2_LITTLE             0x0F
 143 #define TIR_BITS_TQ2_SH_LITTLE          0
 144 #define TIR_BITS_TQ3_LITTLE             0xF0
 145 #define TIR_BITS_TQ3_SH_LITTLE          4
 146
 147 /* Relative symbol external record */
 148
 149 struct rndx_ext {
 150         unsigned char   r_bits[4];
 151 };
 152
 153 #define RNDX_BITS0_RFD_SH_LEFT_BIG      4
 154 #define RNDX_BITS1_RFD_BIG              0xF0
 155 #define RNDX_BITS1_RFD_SH_BIG           4
 156
 157 #define RNDX_BITS0_RFD_SH_LEFT_LITTLE   0
 158 #define RNDX_BITS1_RFD_LITTLE           0x0F
 159 #define RNDX_BITS1_RFD_SH_LEFT_LITTLE   8
 160
 161 #define RNDX_BITS1_INDEX_BIG            0x0F
 162 #define RNDX_BITS1_INDEX_SH_LEFT_BIG    16
 163 #define RNDX_BITS2_INDEX_SH_LEFT_BIG    8
 164 #define RNDX_BITS3_INDEX_SH_LEFT_BIG    0
 165
 166 #define RNDX_BITS1_INDEX_LITTLE         0xF0
 167 #define RNDX_BITS1_INDEX_SH_LITTLE      4
 168 #define RNDX_BITS2_INDEX_SH_LEFT_LITTLE 4
 169 #define RNDX_BITS3_INDEX_SH_LEFT_LITTLE 12
 170
 171 /* Auxiliary symbol information external record */
 172
 173 union aux_ext {
 174         struct tir_ext  a_ti;
 175         struct rndx_ext a_rndx;
 176         unsigned char   a_dnLow[4];
 177         unsigned char   a_dnHigh[4];
 178         unsigned char   a_isym[4];
 179         unsigned char   a_iss[4];
 180         unsigned char   a_width[4];
 181         unsigned char   a_count[4];
 182 };
 183
 184 #define AUX_GET_ANY(bigend, ax, field) \
 185   ((bigend) ? bfd_getb32 ((ax)->field) : bfd_getl32 ((ax)->field))
 186
 187 #define AUX_GET_DNLOW(bigend, ax)       AUX_GET_ANY ((bigend), (ax), a_dnLow)
 188 #define AUX_GET_DNHIGH(bigend, ax)      AUX_GET_ANY ((bigend), (ax), a_dnHigh)
 189 #define AUX_GET_ISYM(bigend, ax)        AUX_GET_ANY ((bigend), (ax), a_isym)
 190 #define AUX_GET_ISS(bigend, ax)         AUX_GET_ANY ((bigend), (ax), a_iss)
 191 #define AUX_GET_WIDTH(bigend, ax)       AUX_GET_ANY ((bigend), (ax), a_width)
 192 #define AUX_GET_COUNT(bigend, ax)       AUX_GET_ANY ((bigend), (ax), a_count)
 193
 194 #define AUX_PUT_ANY(bigend, val, ax, field) \
 195   ((bigend) \
 196    ? (bfd_putb32 ((val), (ax)->field), 0) \
 197    : (bfd_putl32 ((val), (ax)->field), 0))
 198
 199 #define AUX_PUT_DNLOW(bigend, val, ax) \
 200   AUX_PUT_ANY ((bigend), (val), (ax), a_dnLow)
 201 #define AUX_PUT_DNHIGH(bigend, val, ax) \
 202   AUX_PUT_ANY ((bigend), (val), (ax), a_dnHigh)
 203 #define AUX_PUT_ISYM(bigend, val, ax) \
 204   AUX_PUT_ANY ((bigend), (val), (ax), a_isym)
 205 #define AUX_PUT_ISS(bigend, val, ax) \
 206   AUX_PUT_ANY ((bigend), (val), (ax), a_iss)
 207 #define AUX_PUT_WIDTH(bigend, val, ax) \
 208   AUX_PUT_ANY ((bigend), (val), (ax), a_width)
 209 #define AUX_PUT_COUNT(bigend, val, ax) \
 210   AUX_PUT_ANY ((bigend), (val), (ax), a_count)
 211
 212 /* Prototypes for the swapping functions.  These require that sym.h be
 213    included before this file.  */
 214
 215 extern void ecoff_swap_tir_in PARAMS ((int bigend, struct tir_ext *, TIR *));
 216 extern void ecoff_swap_tir_out PARAMS ((int bigend, TIR *, struct tir_ext *));
 217 extern void ecoff_swap_rndx_in PARAMS ((int bigend, struct rndx_ext *,
 218                                         RNDXR *));
 219 extern void ecoff_swap_rndx_out PARAMS ((int bigend, RNDXR *,
 220                                          struct rndx_ext *));
 221
 222 #endif /* ! defined (ECOFF_H) */