1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
|
/*
* Copyright (C) 2010 Tobias Klauser <tklauser@distanz.ch>
* Copyright (C) 2010 chysun2000@gmail.com
*
* This file is part of nios2sim-ng.
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*/
#ifndef _INSTRUCTION_H_
#define _INSTRUCTION_H_
/*
* Instruction Word Formats
*/
/* I-Type instruction */
struct i_type {
uint8_t op:6;
uint16_t imm16;
uint8_t b:5;
uint8_t a:5;
} __packed;
/* R-Type instruction */
struct r_type {
uint8_t op:6;
/*
* Some R-Type instructions embed a small immediate value in the
* low-order bits of OPX.
*/
union {
uint16_t opx11:11;
struct {
uint8_t n:5;
uint8_t opx6:6;
} __packed;
} opx;
uint8_t c:5;
uint8_t b:5;
uint8_t a:5;
} __packed;
/* J-Type instruction */
struct j_type {
uint8_t op:6;
uint32_t imm26:26;
} __packed;
/*
* Instruction Opcodes
*/
/* OPX Encodings for R-Type instructions */
enum {
/* 0x00 */
ERET = 0x01,
ROLI = 0x02,
ROL = 0x03,
FLUSHP = 0x04,
RET = 0x05,
NOR = 0x06,
MULXUU = 0x07,
CMPGE = 0x08,
BRET = 0x09,
/* 0x0A */
ROR = 0x0B,
FLUSHI = 0x0C,
JMP = 0x0D,
AND = 0x0E,
/* 0x0F */
CMPLT = 0x10,
/* 0x11 */
SLLI = 0x12,
SLL = 0x13,
/* 0x14 */
/* 0x15 */
OR = 0x16,
MULXSU = 0x17,
CMPNE = 0x18,
/* 0x19 */
SRLI = 0x1A,
SRL = 0x1B,
NEXTPC = 0x1C,
CALLR = 0x1D,
XOR = 0x1E,
MULXSS = 0x1F,
CMPEQ = 0x20,
/* 0x21 */
/* 0x22 */
/* 0x23 */
DIVU = 0x24,
DIV = 0x25,
RDCTL = 0x26,
MUL = 0x27,
CMPGEU = 0x28,
INITI = 0x29,
/* 0x2A */
/* 0x2B */
/* 0x2C */
TRAP = 0x2D,
WRCTL = 0x2E,
/* 0x2F */
CMPLTU = 0x30,
ADD = 0x31,
/* 0x32 */
/* 0x33 */
BREAK = 0x34,
/* 0x35 */
SYNC = 0x36,
/* 0x37 */
/* 0x38 */
SUB = 0x39,
SRAI = 0x3A,
SRA = 0x3b,
};
/*
* OP Encodings for I-Type instructions (except for CALL, which is a J-type
* instruction)
*/
enum {
CALL = 0x00, /* J-type */
JMPI = 0x01,
/* 0x02 */
LDBU = 0x03,
ADDI = 0x04,
STB = 0x05,
BR = 0x06,
LDB = 0x07,
CMPGEI = 0x08,
/* 0x09 */
/* 0x0A */
LDHU = 0x0B,
ANDI = 0x0C,
STH = 0x0D,
BGE = 0x0E,
LDH = 0x0F,
CMPLTI = 0x10,
/* 0x11 */
/* 0x12 */
INITDA = 0x13,
ORI = 0x14,
STW = 0x15,
BLT = 0x16,
LDW = 0x17,
CMPNEI = 0x18,
/* 0x19 */
/* 0x1A */
FLUSHDA = 0x1B,
XORI = 0x1C,
/* 0x1D */
BNE = 0x1E,
/* 0x1F */
CMPEQI = 0x20,
/* 0x21 */
/* 0x22 */
LDBUIO = 0x23,
MULI = 0x24,
STBIO = 0x25,
BEQ = 0x26,
LDBIO = 0x27,
CMPGEUI = 0x28,
/* 0x29 */
/* 0x2A */
LDHUIO = 0x2B,
ANDHI = 0x2C,
STHIO = 0x2D,
BGEU = 0x2E,
LDHIO = 0x2F,
CMPLTUI = 0x30,
/* 0x31 */
CUSTOM = 0x32,
INITD = 0x33,
ORHI = 0x34,
STWIO = 0x35,
BLTU = 0x36,
LDWIO = 0x37,
/* 0x38 */
/* 0x39 */
R_TYPE = 0x3A,
FLUSHD = 0x3B,
XORHI = 0x3C,
};
#endif /* _INSTRUCTION_H_ */
|
