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
|
invalid_msg:
.asciz "Invalid instruction at %X\n"
.global m68k_invalid
m68k_invalid:
lea invalid_msg(%rip), %rdi
mov %ecx, %esi
xor %rax, %rax
call printf
mov $1, %rdi
call exit
.global bcd_add
bcd_add:
xchg %rax, %rdi
mov %cl, %ch
mov %al, %ah
and $0xF, %ch
and $0xF, %ah
and $0xF0, %cl
and $0xF0, %al
add %ah, %ch
cmp $10, %ch
jb no_adjust
add $6, %ch
no_adjust:
add %ch, %al
add %al, %cl
mov $0, %ch
jc def_adjust
cmp $0xA0, %cl
jb no_adjust_h
def_adjust:
add $0x60, %cl
mov $1, %ch
no_adjust_h:
mov %rdi, %rax
ret
.global bcd_sub
bcd_sub:
xchg %rax, %rdi
mov %cl, %ch
mov %al, %ah
and $0xF, %ch
and $0xF, %ah
and $0xF0, %cl
and $0xF0, %al
sub %ah, %ch
cmp $10, %ch
jb no_adjusts
sub $6, %ch
no_adjusts:
add %ch, %cl
sub %al, %cl
mov $0, %ch
jc def_adjusts
cmp $0xA0, %cl
jb no_adjust_hs
def_adjusts:
sub $0x60, %cl
mov $1, %ch
no_adjust_hs:
mov %rdi, %rax
ret
.global get_sr
get_sr:
mov 5(%rsi), %cl
shl $8, %cx
mov (%rsi), %cl
shl $1, %cl
or %bl, %cl
shl $1, %cl
or %dl, %cl
shl $1, %cl
or %bh, %cl
shl $1, %cl
or %dh, %cl
ret
.global set_sr
set_sr:
mov %cl, %dh
and $1, %dh
shr $1, %cl
mov %cl, %bh
and $1, %bh
shr $1, %cl
mov %cl, %dl
and $1, %dl
shr $1, %cl
mov %cl, %bl
and $1, %bl
shr $1, %cl
and $1, %cl
mov %cl, (%rsi)
shr $8, %cx
mov %cl, 5(%rsi)
ret
.global set_ccr
set_ccr:
mov %cl, %dh
and $1, %dh
shr $1, %cl
mov %cl, %bh
and $1, %bh
shr $1, %cl
mov %cl, %dl
and $1, %dl
shr $1, %cl
mov %cl, %bl
and $1, %bl
shr $1, %cl
and $1, %cl
mov %cl, (%rsi)
ret
|
