1 /* alpha.h -- Header file for Alpha opcode table
2 Copyright 1996, 1999 Free Software Foundation, Inc.
3 Contributed by Richard Henderson <rth@tamu.edu>,
4 patterned after the PPC opcode table written by Ian Lance Taylor.
6 This file is part of GDB, GAS, and the GNU binutils.
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.
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.
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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22 #ifndef OPCODE_ALPHA_H
23 #define OPCODE_ALPHA_H
25 /* The opcode table is an array of struct alpha_opcode. */
29 /* The opcode name. */
32 /* The opcode itself. Those bits which will be filled in with
33 operands are zeroes. */
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). */
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. */
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];
53 /* The table itself is sorted by major opcode number, and is otherwise
54 in the order in which the disassembler should consider
56 extern const struct alpha_opcode alpha_opcodes[];
57 extern const unsigned alpha_num_opcodes;
59 /* Values defined for the flags field of a struct alpha_opcode. */
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). */
70 #define AXP_OPCODE_NOPAL (~(AXP_OPCODE_EV4|AXP_OPCODE_EV5|AXP_OPCODE_EV6))
72 /* A macro to extract the major opcode from an instruction. */
73 #define AXP_OP(i) (((i) >> 26) & 0x3F)
75 /* The total number of major opcodes. */
79 /* The operands table is an array of struct alpha_operand. */
83 /* The number of bits in the operand. */
86 /* How far the operand is left shifted in the instruction. */
89 /* The default relocation type for this operand. */
92 /* One bit syntax flags. */
95 /* Insertion function. This is used by the assembler. To insert an
96 operand value into an instruction, check this field.
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).
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) PARAMS ((unsigned instruction, int op,
112 const char **errmsg));
114 /* Extraction function. This is used by the disassembler. To
115 extract this operand type from an instruction, check this field.
117 If it is NULL, compute
118 op = ((i) >> o->shift) & ((1 << o->bits) - 1);
119 if ((o->flags & AXP_OPERAND_SIGNED) != 0
120 && (op & (1 << (o->bits - 1))) != 0)
122 (i is the instruction, o is a pointer to this structure, and op
123 is the result; this assumes twos complement arithmetic).
125 If this field is not NULL, then simply call it with the
126 instruction value. It will return the value of the operand. If
127 the INVALID argument is not NULL, *INVALID will be set to
128 non-zero if this operand type can not actually be extracted from
129 this operand (i.e., the instruction does not match). If the
130 operand is valid, *INVALID will not be changed. */
131 int (*extract) PARAMS ((unsigned instruction, int *invalid));
134 /* Elements in the table are retrieved by indexing with values from
135 the operands field of the alpha_opcodes table. */
137 extern const struct alpha_operand alpha_operands[];
138 extern const unsigned alpha_num_operands;
140 /* Values defined for the flags field of a struct alpha_operand. */
142 /* Mask for selecting the type for typecheck purposes */
143 #define AXP_OPERAND_TYPECHECK_MASK \
144 (AXP_OPERAND_PARENS | AXP_OPERAND_COMMA | AXP_OPERAND_IR | \
145 AXP_OPERAND_FPR | AXP_OPERAND_RELATIVE | AXP_OPERAND_SIGNED | \
146 AXP_OPERAND_UNSIGNED)
148 /* This operand does not actually exist in the assembler input. This
149 is used to support extended mnemonics, for which two operands fields
150 are identical. The assembler should call the insert function with
151 any op value. The disassembler should call the extract function,
152 ignore the return value, and check the value placed in the invalid
154 #define AXP_OPERAND_FAKE 01
156 /* The operand should be wrapped in parentheses rather than separated
157 from the previous by a comma. This is used for the load and store
158 instructions which want their operands to look like "Ra,disp(Rb)". */
159 #define AXP_OPERAND_PARENS 02
161 /* Used in combination with PARENS, this supresses the supression of
162 the comma. This is used for "jmp Ra,(Rb),hint". */
163 #define AXP_OPERAND_COMMA 04
165 /* This operand names an integer register. */
166 #define AXP_OPERAND_IR 010
168 /* This operand names a floating point register. */
169 #define AXP_OPERAND_FPR 020
171 /* This operand is a relative branch displacement. The disassembler
172 prints these symbolically if possible. */
173 #define AXP_OPERAND_RELATIVE 040
175 /* This operand takes signed values. */
176 #define AXP_OPERAND_SIGNED 0100
178 /* This operand takes unsigned values. This exists primarily so that
179 a flags value of 0 can be treated as end-of-arguments. */
180 #define AXP_OPERAND_UNSIGNED 0200
182 /* Supress overflow detection on this field. This is used for hints. */
183 #define AXP_OPERAND_NOOVERFLOW 0400
185 /* Mask for optional argument default value. */
186 #define AXP_OPERAND_OPTIONAL_MASK 07000
188 /* This operand defaults to zero. This is used for jump hints. */
189 #define AXP_OPERAND_DEFAULT_ZERO 01000
191 /* This operand should default to the first (real) operand and is used
192 in conjunction with AXP_OPERAND_OPTIONAL. This allows
193 "and $0,3,$0" to be written as "and $0,3", etc. I don't like
194 it, but it's what DEC does. */
195 #define AXP_OPERAND_DEFAULT_FIRST 02000
197 /* Similarly, this operand should default to the second (real) operand.
198 This allows "negl $0" instead of "negl $0,$0". */
199 #define AXP_OPERAND_DEFAULT_SECOND 04000
202 /* Register common names */
214 #define AXP_REG_S1 10
215 #define AXP_REG_S2 11
216 #define AXP_REG_S3 12
217 #define AXP_REG_S4 13
218 #define AXP_REG_S5 14
219 #define AXP_REG_FP 15
220 #define AXP_REG_A0 16
221 #define AXP_REG_A1 17
222 #define AXP_REG_A2 18
223 #define AXP_REG_A3 19
224 #define AXP_REG_A4 20
225 #define AXP_REG_A5 21
226 #define AXP_REG_T8 22
227 #define AXP_REG_T9 23
228 #define AXP_REG_T10 24
229 #define AXP_REG_T11 25
230 #define AXP_REG_RA 26
231 #define AXP_REG_PV 27
232 #define AXP_REG_T12 27
233 #define AXP_REG_AT 28
234 #define AXP_REG_GP 29
235 #define AXP_REG_SP 30
236 #define AXP_REG_ZERO 31
238 #endif /* OPCODE_ALPHA_H */