-
Notifications
You must be signed in to change notification settings - Fork 2
/
simple_encode_manual.mips
168 lines (148 loc) · 4.43 KB
/
simple_encode_manual.mips
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
# 32 bit mips
# ELF 32-bit MSB executable, MIPS, MIPS-I version 1, dynamically linked (uses
# shared libs), for GNU/Linux 4.10.8, with unknown capability 0x41000000 =
# 0xf676e75, with unknown capability 0x10000 = 0x70401, not stripped
#
# add
# sub
# and
# or
# slt
# addi
# beq
# j
# lw
# sw
# this is the first thing run on our processor. sp is already 0
# -------------------------------------------------------
# Modified 32 bit wide structure:
#
# 11 states
# 32 bits
# 4 16-bit registers
# 1 16-bit program counter
#
#
# Instruction | Function | Encoding | op | funct
# ------------------------------------------------------------------------------------------
# add $1, $2, $3 | addition: $1 <- $2 + $3 | R | 000000 | 100000
# sub $1, $2, $3 | subtraction: $1 <- $2 – $3 | R | 000000 | 100010
# and $1, $2, $3 | bitwise and: $1 <- $2 and $3 | R | 000000 | 100100
# or $1, $2, $3 | bitwise or: $1 <- $2 or $3 | R | 000000 | 100101
# slt $1, $2, $3 | set less than: $1 <- 1 if $2 < $3 | R | 000000 | 101010
# | $1 <- 0 otherwise
# sra $1, $2, $3 | shift right arith $1 <- $2 >>> $3 | R | 000000 | 000011
# sll $1, $2, $3 | shift left logic $1 <- $2 << $3 | R | 000000 | 000000
# addi $1, $2, imm | add immediate: $1 <- $2 + imm | I | 001000 | n/a
# beq $1, $2, imm | branch if equal: PC <- PC + imm × 4 | I | 000100 | n/a
# j destination | jump: PC <- destinationa | J | 000010 | n/a
# lw $1, imm($2) | load word: $1 <- mem[$2 + imm] | I | 100000 | n/a
# sw $1, imm($2) | store word: mem[$2 + imm] <- $1 | I | 101000 | n/a
#
#
# R (add $rd, $ra, $rb) 6 5 5 5 5 6
# 0 ra rb rd 0 funct
#
# I (beq $ra, $rb, imm) 6 5 5 16
# op ra rb imm
#
# J (j dest) 6 26
# op dest
#
# examples:
# * addi: 001000 aaaaa bbbbb iiiiiiii iiiiiiii
# * beq: 000100 aaaaa bbbbb iiiiiiii iiiiiiii
# * sw: 101000 aaaaa bbbbb iiiiiiii iiiiiiii
# * lw: 101000 aaaaa bbbbb iiiiiiii iiiiiiii
#
# * j: 000010 dd dddddddd dddddddd dddddddd
#
# * add: 000000 aaaaa bbbbb ddddd 00000 100000
Main:
addi $fp, $sp, 0
addi $2, $0, 60
sw $2, 12($fp)
sw $0, 16($fp)
lw $2, 12($fp)
addi $0, $0, 0 # no-op
addi $3, $2, 1
sw $3, 12($fp)
addi $3, $fp, 8
add $2, $3, $2
lw $2, 20($2)
addi $0, $0, 0 # no-op
sw $2, 8($fp)
j Whilecheck
addi $0, $0, 0 # no-op
Whilebody:
addi $2, $0, 7
sw $2, 20($fp)
j Forcheck
addi $0, $0, 0 # no-op
Forbody:
lw $2, 16($fp)
addi $0, $0, 0 # no-op
addi $2, $2, 1
addi $3, $fp, 8
add $2, $3, $2
lw $2, 120($2)
addi $0, $0, 0 # no-op
sw $2, 24($fp)
lw $2, 24($fp)
addi $0, $0, 0 # no-op
addi $7, $0, 0xfe
and $3, $2, $7
lw $4, 8($fp)
lw $2, 20($fp)
addi $0, $0, 0 # no-op
sra $2, $4, $2 # TODO
addi $7, $0, 0x1
and $2, $2, $7
or $2, $3, $2
sw $2, 24($fp)
lw $2, 24($fp)
addi $0, $0, 0 # no-op
sll $3, $2, 24 # TODO
sra $3, $3, 24 # TODO
lw $2, 16($fp)
addi $4, $fp, 8
add $2, $4, $2
sw $3, 120($2)
lw $2, 16($fp)
addi $0, $0, 0 # no-op
addi $2, $2, 1
sw $2, 16($fp)
lw $2, 20($fp)
addi $0, $0, 0 # no-op
addi $2, $2, -1
sw $2, 20($fp)
Forcheck:
lw $2, 20($fp)
addi $0, $0, 0 # no-op
slt $7, $0, $2
beq $7, $0, Forcheckcont1
j Forbody
Forcheckcont1:
addi $0, $0, 0 # no-op
lw $2, 12($fp)
addi $0, $0, 0 # no-op
addi $3, $2, 1
sw $3, 12($fp)
addi $3, $fp, 8
add $2, $3, $2
lw $2, 20($2)
addi $0, $0, 0 # no-op
sw $2, 8($fp)
Whilecheck:
lw $3, 12($fp)
addi $2, $0, 100
beq $3, $2, End
addi $0, $0, 0 # no-op
lw $3, 16($fp)
addi $2, $0, 1000
beq $3, $2, End
j Whilebody
End:
addi $0, $0, 0 # no-op
addi $2, $0, 0
addi $sp, $fp, 0