include/opcode/alpha.h

   1 /* alpha.h -- Header file for Alpha opcode table
   2    Copyright 1996, 1999, 2001, 2003 Free Software Foundation, Inc.
   3    Contributed by Richard Henderson <rth@tamu.edu>,
   4    patterned after the PPC opcode table written by Ian Lance Taylor.
   5
   6 This file is part of GDB, GAS, and the GNU binutils.
   7
   8 GDB, GAS, and the GNU binutils are free software; you can redistribute
   9 them and/or modify them under the terms of the GNU General Public
  10 License as published by the Free Software Foundation; either version
  11 1, or (at your option) any later version.
  12
  13 GDB, GAS, and the GNU binutils are distributed in the hope that they
  14 will be useful, but WITHOUT ANY WARRANTY; without even the implied
  15 warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
  16 the GNU General Public License for more details.
  17
  18 You should have received a copy of the GNU General Public License
  19 along with this file; see the file COPYING.  If not, write to the Free
  20 Software Foundation, 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  21
  22 #ifndef OPCODE_ALPHA_H
  23 #define OPCODE_ALPHA_H
  24
  25 /* The opcode table is an array of struct alpha_opcode.  */
  26
  27 struct alpha_opcode
  28 {
  29   /* The opcode name.  */
  30   const char *name;
  31
  32   /* The opcode itself.  Those bits which will be filled in with
  33      operands are zeroes.  */
  34   unsigned opcode;
  35
  36   /* The opcode mask.  This is used by the disassembler.  This is a
  37      mask containing ones indicating those bits which must match the
  38      opcode field, and zeroes indicating those bits which need not
  39      match (and are presumably filled in by operands).  */
  40   unsigned mask;
  41
  42   /* One bit flags for the opcode.  These are primarily used to
  43      indicate specific processors and environments support the
  44      instructions.  The defined values are listed below. */
  45   unsigned flags;
  46
  47   /* An array of operand codes.  Each code is an index into the
  48      operand table.  They appear in the order which the operands must
  49      appear in assembly code, and are terminated by a zero.  */
  50   unsigned char operands[4];
  51 };
  52
  53 /* The table itself is sorted by major opcode number, and is otherwise
  54    in the order in which the disassembler should consider
  55    instructions.  */
  56 extern const struct alpha_opcode alpha_opcodes[];
  57 extern const unsigned alpha_num_opcodes;
  58
  59 /* Values defined for the flags field of a struct alpha_opcode.  */
  60
  61 /* CPU Availability */
  62 #define AXP_OPCODE_BASE  0x0001  /* Base architecture -- all cpus.  */
  63 #define AXP_OPCODE_EV4   0x0002  /* EV4 specific PALcode insns.  */
  64 #define AXP_OPCODE_EV5   0x0004  /* EV5 specific PALcode insns.  */
  65 #define AXP_OPCODE_EV6   0x0008  /* EV6 specific PALcode insns.  */
  66 #define AXP_OPCODE_BWX   0x0100  /* Byte/word extension (amask bit 0).  */
  67 #define AXP_OPCODE_CIX   0x0200  /* "Count" extension (amask bit 1).  */
  68 #define AXP_OPCODE_MAX   0x0400  /* Multimedia extension (amask bit 8).  */
  69
  70 #define AXP_OPCODE_NOPAL (~(AXP_OPCODE_EV4|AXP_OPCODE_EV5|AXP_OPCODE_EV6))
  71
  72 /* A macro to extract the major opcode from an instruction.  */
  73 #define AXP_OP(i)       (((i) >> 26) & 0x3F)
  74
  75 /* The total number of major opcodes. */
  76 #define AXP_NOPS        0x40
  77
  78 \f
  79 /* The operands table is an array of struct alpha_operand.  */
  80
  81 struct alpha_operand
  82 {
  83   /* The number of bits in the operand.  */
  84   unsigned int bits : 5;
  85
  86   /* How far the operand is left shifted in the instruction.  */
  87   unsigned int shift : 5;
  88
  89   /* The default relocation type for this operand.  */
  90   signed int default_reloc : 16;
  91
  92   /* One bit syntax flags.  */
  93   unsigned int flags : 16;
  94
  95   /* Insertion function.  This is used by the assembler.  To insert an
  96      operand value into an instruction, check this field.
  97
  98      If it is NULL, execute
  99          i |= (op & ((1 << o->bits) - 1)) << o->shift;
 100      (i is the instruction which we are filling in, o is a pointer to
 101      this structure, and op is the opcode value; this assumes twos
 102      complement arithmetic).
 103
 104      If this field is not NULL, then simply call it with the
 105      instruction and the operand value.  It will return the new value
 106      of the instruction.  If the ERRMSG argument is not NULL, then if
 107      the operand value is illegal, *ERRMSG will be set to a warning
 108      string (the operand will be inserted in any case).  If the
 109      operand value is legal, *ERRMSG will be unchanged (most operands
 110      can accept any value).  */
 111   unsigned (*insert) (unsigned instruction, int op, const char **errmsg);
 112
 113   /* Extraction function.  This is used by the disassembler.  To
 114      extract this operand type from an instruction, check this field.
 115
 116      If it is NULL, compute
 117          op = ((i) >> o->shift) & ((1 << o->bits) - 1);
 118          if ((o->flags & AXP_OPERAND_SIGNED) != 0
 119              && (op & (1 << (o->bits - 1))) != 0)
 120            op -= 1 << o->bits;
 121      (i is the instruction, o is a pointer to this structure, and op
 122      is the result; this assumes twos complement arithmetic).
 123
 124      If this field is not NULL, then simply call it with the
 125      instruction value.  It will return the value of the operand.  If
 126      the INVALID argument is not NULL, *INVALID will be set to
 127      non-zero if this operand type can not actually be extracted from
 128      this operand (i.e., the instruction does not match).  If the
 129      operand is valid, *INVALID will not be changed.  */
 130   int (*extract) (unsigned instruction, int *invalid);
 131 };
 132
 133 /* Elements in the table are retrieved by indexing with values from
 134    the operands field of the alpha_opcodes table.  */
 135
 136 extern const struct alpha_operand alpha_operands[];
 137 extern const unsigned alpha_num_operands;
 138
 139 /* Values defined for the flags field of a struct alpha_operand.  */
 140
 141 /* Mask for selecting the type for typecheck purposes */
 142 #define AXP_OPERAND_TYPECHECK_MASK                                      \
 143   (AXP_OPERAND_PARENS | AXP_OPERAND_COMMA | AXP_OPERAND_IR |            \
 144    AXP_OPERAND_FPR | AXP_OPERAND_RELATIVE | AXP_OPERAND_SIGNED |        \
 145    AXP_OPERAND_UNSIGNED)
 146
 147 /* This operand does not actually exist in the assembler input.  This
 148    is used to support extended mnemonics, for which two operands fields
 149    are identical.  The assembler should call the insert function with
 150    any op value.  The disassembler should call the extract function,
 151    ignore the return value, and check the value placed in the invalid
 152    argument.  */
 153 #define AXP_OPERAND_FAKE        01
 154
 155 /* The operand should be wrapped in parentheses rather than separated
 156    from the previous by a comma.  This is used for the load and store
 157    instructions which want their operands to look like "Ra,disp(Rb)".  */
 158 #define AXP_OPERAND_PARENS      02
 159
 160 /* Used in combination with PARENS, this supresses the supression of
 161    the comma.  This is used for "jmp Ra,(Rb),hint".  */
 162 #define AXP_OPERAND_COMMA       04
 163
 164 /* This operand names an integer register.  */
 165 #define AXP_OPERAND_IR          010
 166
 167 /* This operand names a floating point register.  */
 168 #define AXP_OPERAND_FPR         020
 169
 170 /* This operand is a relative branch displacement.  The disassembler
 171    prints these symbolically if possible.  */
 172 #define AXP_OPERAND_RELATIVE    040
 173
 174 /* This operand takes signed values.  */
 175 #define AXP_OPERAND_SIGNED      0100
 176
 177 /* This operand takes unsigned values.  This exists primarily so that
 178    a flags value of 0 can be treated as end-of-arguments.  */
 179 #define AXP_OPERAND_UNSIGNED    0200
 180
 181 /* Supress overflow detection on this field.  This is used for hints. */
 182 #define AXP_OPERAND_NOOVERFLOW  0400
 183
 184 /* Mask for optional argument default value.  */
 185 #define AXP_OPERAND_OPTIONAL_MASK 07000
 186
 187 /* This operand defaults to zero.  This is used for jump hints.  */
 188 #define AXP_OPERAND_DEFAULT_ZERO 01000
 189
 190 /* This operand should default to the first (real) operand and is used
 191    in conjunction with AXP_OPERAND_OPTIONAL.  This allows
 192    "and $0,3,$0" to be written as "and $0,3", etc.  I don't like
 193    it, but it's what DEC does.  */
 194 #define AXP_OPERAND_DEFAULT_FIRST 02000
 195
 196 /* Similarly, this operand should default to the second (real) operand.
 197    This allows "negl $0" instead of "negl $0,$0".  */
 198 #define AXP_OPERAND_DEFAULT_SECOND 04000
 199
 200 \f
 201 /* Register common names */
 202
 203 #define AXP_REG_V0      0
 204 #define AXP_REG_T0      1
 205 #define AXP_REG_T1      2
 206 #define AXP_REG_T2      3
 207 #define AXP_REG_T3      4
 208 #define AXP_REG_T4      5
 209 #define AXP_REG_T5      6
 210 #define AXP_REG_T6      7
 211 #define AXP_REG_T7      8
 212 #define AXP_REG_S0      9
 213 #define AXP_REG_S1      10
 214 #define AXP_REG_S2      11
 215 #define AXP_REG_S3      12
 216 #define AXP_REG_S4      13
 217 #define AXP_REG_S5      14
 218 #define AXP_REG_FP      15
 219 #define AXP_REG_A0      16
 220 #define AXP_REG_A1      17
 221 #define AXP_REG_A2      18
 222 #define AXP_REG_A3      19
 223 #define AXP_REG_A4      20
 224 #define AXP_REG_A5      21
 225 #define AXP_REG_T8      22
 226 #define AXP_REG_T9      23
 227 #define AXP_REG_T10     24
 228 #define AXP_REG_T11     25
 229 #define AXP_REG_RA      26
 230 #define AXP_REG_PV      27
 231 #define AXP_REG_T12     27
 232 #define AXP_REG_AT      28
 233 #define AXP_REG_GP      29
 234 #define AXP_REG_SP      30
 235 #define AXP_REG_ZERO    31
 236
 237 #endif /* OPCODE_ALPHA_H */