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1 | /* alpha.h -- Header file for Alpha opcode table |
2 | Copyright 1996 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ | |
21 | ||
22 | #ifndef OPCODE_ALPHA_H | |
23 | #define OPCODE_ALPHA_H | |
24 | ||
25 | #include "bfd.h" /* for bfd_reloc_code_real_type */ | |
26 | ||
27 | /* The opcode table is an array of struct alpha_opcode. */ | |
28 | ||
29 | struct alpha_opcode | |
30 | { | |
31 | /* The opcode name. */ | |
32 | const char *name; | |
33 | ||
34 | /* The opcode itself. Those bits which will be filled in with | |
35 | operands are zeroes. */ | |
36 | unsigned opcode; | |
37 | ||
38 | /* The opcode mask. This is used by the disassembler. This is a | |
39 | mask containing ones indicating those bits which must match the | |
40 | opcode field, and zeroes indicating those bits which need not | |
41 | match (and are presumably filled in by operands). */ | |
42 | unsigned mask; | |
43 | ||
44 | /* One bit flags for the opcode. These are primarily used to | |
45 | indicate specific processors and environments support the | |
46 | instructions. The defined values are listed below. */ | |
47 | unsigned flags; | |
48 | ||
49 | /* An array of operand codes. Each code is an index into the | |
50 | operand table. They appear in the order which the operands must | |
51 | appear in assembly code, and are terminated by a zero. */ | |
52 | unsigned char operands[4]; | |
53 | }; | |
54 | ||
55 | /* The table itself is sorted by major opcode number, and is otherwise | |
56 | in the order in which the disassembler should consider | |
57 | instructions. */ | |
58 | extern const struct alpha_opcode alpha_opcodes[]; | |
59 | extern const int alpha_num_opcodes; | |
60 | ||
61 | /* Values defined for the flags field of a struct alpha_opcode. */ | |
62 | ||
63 | /* CPU Availability */ | |
64 | #define AXP_OPCODE_ALL 00001 | |
65 | #define AXP_OPCODE_EV4 00002 | |
66 | /* EV45 is not programatically different */ | |
67 | #define AXP_OPCODE_EV5 00004 | |
68 | #define AXP_OPCODE_EV56 00010 | |
69 | ||
70 | /* A macro to extract the major opcode from an instruction. */ | |
71 | #define AXP_OP(i) (((i) >> 26) & 0x3F) | |
72 | ||
73 | /* The total number of major opcodes. */ | |
74 | #define AXP_NOPS 0x40 | |
75 | ||
76 | \f | |
77 | /* The operands table is an array of struct alpha_operand. */ | |
78 | ||
79 | struct alpha_operand | |
80 | { | |
81 | /* The number of bits in the operand. */ | |
82 | int bits; | |
83 | ||
84 | /* How far the operand is left shifted in the instruction. */ | |
85 | int shift; | |
86 | ||
87 | /* The default relocation type for this operand. */ | |
88 | bfd_reloc_code_real_type default_reloc; | |
89 | ||
90 | /* Insertion function. This is used by the assembler. To insert an | |
91 | operand value into an instruction, check this field. | |
92 | ||
93 | If it is NULL, execute | |
94 | i |= (op & ((1 << o->bits) - 1)) << o->shift; | |
95 | (i is the instruction which we are filling in, o is a pointer to | |
96 | this structure, and op is the opcode value; this assumes twos | |
97 | complement arithmetic). | |
98 | ||
99 | If this field is not NULL, then simply call it with the | |
100 | instruction and the operand value. It will return the new value | |
101 | of the instruction. If the ERRMSG argument is not NULL, then if | |
102 | the operand value is illegal, *ERRMSG will be set to a warning | |
103 | string (the operand will be inserted in any case). If the | |
104 | operand value is legal, *ERRMSG will be unchanged (most operands | |
105 | can accept any value). */ | |
106 | unsigned (*insert) PARAMS ((unsigned instruction, int op, | |
107 | const char **errmsg)); | |
108 | ||
109 | /* Extraction function. This is used by the disassembler. To | |
110 | extract this operand type from an instruction, check this field. | |
111 | ||
112 | If it is NULL, compute | |
113 | op = ((i) >> o->shift) & ((1 << o->bits) - 1); | |
114 | if ((o->flags & AXP_OPERAND_SIGNED) != 0 | |
115 | && (op & (1 << (o->bits - 1))) != 0) | |
116 | op -= 1 << o->bits; | |
117 | (i is the instruction, o is a pointer to this structure, and op | |
118 | is the result; this assumes twos complement arithmetic). | |
119 | ||
120 | If this field is not NULL, then simply call it with the | |
121 | instruction value. It will return the value of the operand. If | |
122 | the INVALID argument is not NULL, *INVALID will be set to | |
123 | non-zero if this operand type can not actually be extracted from | |
124 | this operand (i.e., the instruction does not match). If the | |
125 | operand is valid, *INVALID will not be changed. */ | |
126 | int (*extract) PARAMS ((unsigned instruction, int *invalid)); | |
127 | ||
128 | /* One bit syntax flags. */ | |
129 | unsigned flags; | |
130 | }; | |
131 | ||
132 | /* Elements in the table are retrieved by indexing with values from | |
133 | the operands field of the alpha_opcodes table. */ | |
134 | ||
135 | extern const struct alpha_operand alpha_operands[]; | |
136 | extern const int alpha_num_operands; | |
137 | ||
138 | /* Values defined for the flags field of a struct alpha_operand. */ | |
139 | ||
140 | /* Mask for selecting the type for typecheck purposes */ | |
141 | #define AXP_OPERAND_TYPECHECK_MASK \ | |
142 | (AXP_OPERAND_PARENS | AXP_OPERAND_COMMA | AXP_OPERAND_IR | \ | |
143 | AXP_OPERAND_FPR | AXP_OPERAND_RELATIVE | AXP_OPERAND_SIGNED | \ | |
144 | AXP_OPERAND_UNSIGNED) | |
145 | ||
146 | /* This operand does not actually exist in the assembler input. This | |
147 | is used to support extended mnemonics, for which two operands fields | |
148 | are identical. The assembler should call the insert function with | |
149 | any op value. The disassembler should call the extract function, | |
150 | ignore the return value, and check the value placed in the invalid | |
151 | argument. */ | |
152 | #define AXP_OPERAND_FAKE 01 | |
153 | ||
154 | /* The operand should be wrapped in parentheses rather than separated | |
155 | from the previous by a comma. This is used for the load and store | |
156 | instructions which want their operands to look like "Ra,disp(Rb)". */ | |
157 | #define AXP_OPERAND_PARENS 02 | |
158 | ||
159 | /* Used in combination with PARENS, this supresses the supression of | |
160 | the comma. This is used for "jmp Ra,(Rb),hint". */ | |
161 | #define AXP_OPERAND_COMMA 04 | |
162 | ||
163 | /* This operand names an integer register. */ | |
164 | #define AXP_OPERAND_IR 010 | |
165 | ||
166 | /* This operand names a floating point register. */ | |
167 | #define AXP_OPERAND_FPR 020 | |
168 | ||
169 | /* This operand is a relative branch displacement. The disassembler | |
170 | prints these symbolically if possible. */ | |
171 | #define AXP_OPERAND_RELATIVE 040 | |
172 | ||
173 | /* This operand takes signed values. */ | |
174 | #define AXP_OPERAND_SIGNED 0100 | |
175 | ||
176 | /* This operand takes unsigned values. This exists primarily so that | |
177 | a flags value of 0 can be treated as end-of-arguments. */ | |
178 | #define AXP_OPERAND_UNSIGNED 0200 | |
179 | ||
180 | /* Supress overflow detection on this field. This is used for hints. */ | |
181 | #define AXP_OPERAND_NOOVERFLOW 0400 | |
182 | ||
183 | /* Mask for optional argument default value. */ | |
184 | #define AXP_OPERAND_OPTIONAL_MASK 07000 | |
185 | ||
186 | /* This operand defaults to zero. This is used for jump hints. */ | |
187 | #define AXP_OPERAND_DEFAULT_ZERO 01000 | |
188 | ||
189 | /* This operand should default to the first (real) operand and is used | |
190 | in conjunction with AXP_OPERAND_OPTIONAL. This allows | |
191 | "and $0,3,$0" to be written as "and $0,3", etc. I don't like | |
192 | it, but it's what DEC does. */ | |
193 | #define AXP_OPERAND_DEFAULT_FIRST 02000 | |
194 | ||
195 | /* Similarly, this operand should default to the second (real) operand. | |
196 | This allows "negl $0" instead of "negl $0,$0". */ | |
197 | #define AXP_OPERAND_DEFAULT_SECOND 04000 | |
198 | ||
199 | \f | |
200 | /* Register common names */ | |
201 | ||
202 | #define AXP_REG_V0 0 | |
203 | #define AXP_REG_T0 1 | |
204 | #define AXP_REG_T1 2 | |
205 | #define AXP_REG_T2 3 | |
206 | #define AXP_REG_T3 4 | |
207 | #define AXP_REG_T4 5 | |
208 | #define AXP_REG_T5 6 | |
209 | #define AXP_REG_T6 7 | |
210 | #define AXP_REG_T7 8 | |
211 | #define AXP_REG_S0 9 | |
212 | #define AXP_REG_S1 10 | |
213 | #define AXP_REG_S2 11 | |
214 | #define AXP_REG_S3 12 | |
215 | #define AXP_REG_S4 13 | |
216 | #define AXP_REG_S5 14 | |
217 | #define AXP_REG_FP 15 | |
218 | #define AXP_REG_A0 16 | |
219 | #define AXP_REG_A1 17 | |
220 | #define AXP_REG_A2 18 | |
221 | #define AXP_REG_A3 19 | |
222 | #define AXP_REG_A4 20 | |
223 | #define AXP_REG_A5 21 | |
224 | #define AXP_REG_T8 22 | |
225 | #define AXP_REG_T9 23 | |
226 | #define AXP_REG_T10 24 | |
227 | #define AXP_REG_T11 25 | |
228 | #define AXP_REG_RA 26 | |
229 | #define AXP_REG_PV 27 | |
230 | #define AXP_REG_T12 27 | |
231 | #define AXP_REG_AT 28 | |
232 | #define AXP_REG_GP 29 | |
233 | #define AXP_REG_SP 30 | |
234 | #define AXP_REG_ZERO 31 | |
235 | ||
236 | #endif /* OPCODE_ALPHA_H */ |