Cmp/neg test bench

From Zet

In this example these instructions are tested:

• cmp and neg

Code

.code16
start:
 
movw $96, %sp
 
# cmp word tests
movw $0x0001, %ax
movw $0x0002, %bx
cmpw %bx, %ax
movw %ax, (0)
movw %bx, (2)
pushf
 
movw $0xffff, %dx
movw $0xffff, (4)
cmpw %dx, (4)
movw %dx, (6)
pushf
 
movw $0xffff, %cx
movw $0x0001, (8)
cmpw (8), %cx
movw %cx, (10)
pushf
 
movw $0x8000, %ax
cmpw $0x0001, %ax
movw %ax, (12)
pushf
 
movw $0x8000, %bp
.byte 0x83,0xfd,0xff
movw %bp, (14)
pushf
 
movw $0x7f81, %si
cmpw $0x903c, %si
movw %si, (16)
pushf
 
movw $0xefc3, (18)
cmpw $0xc664, (18)
pushf
 
movw $0xe933, (20)
.word 0x3e83, 0x0014
.byte 0x64
pushf
 
# cmp byte tests
movb $0x01, (22)
cmpb $0x02, (22)
pushf
 
movb $0xff, %dh
cmpb $0xff, %dh
movw %dx, (23)
pushf
 
movb $0xff, %al
cmpb $0x01, %al
movw %ax, (25)
pushf
 
movb $0x80, (27)
movb $0x01, %ch
cmpb (27), %ch
movw %cx, (28)
pushf
 
movb $0x80, %bl
movb $0x7f, (30)
cmpb %bl, (30)
movw %bx, (31)
pushf
 
movb $0xbc, %al
movb $0x8e, %ah
cmpb %al, %ah
movw %ax, (33)
pushf
 
# neg word tests
movw $0x0, %cx
negw %cx
movw %cx, (34)
pushf
 
movw $0x7fff, (36)
negw (36)
pushf
 
movw $0x8000, %bp
negw %bp
movw %bp, (38)
pushf
 
movw $0xace9, (40)
negw (40)
pushf
 
# neg byte tests
movb $0x0, %ah
negb %ah
movw %ax, (42)
pushf
 
movb $0x7f, (44)
negb (44)
pushf
 
movb $0xc9, %cl
negb %cl
movw %cx, (45)
pushf
 
movb $0x80, (47)
negb (47)
pushf
hlt
 
.org 65520
jmp start
.org 65535
.byte 0xff
 
 

Results

Memory contents at the end should be:

0x00:  0x0001  0x0002  0xffff  0xffff  0x0001  0xffff  0x8000  0x8000
0x10:  0x7f81  0xefc3  0xe933  0xff01  0xffff  0x8080  0x01ff  0x807f
0x20:  0xbc00  0x0000  0x8001  0x8000  0x5317  0x00bc  0x3781  0x8000
0x30:  0xXXXX  0xXXXX  0x0883  0x0013  0x0097  0x0046  0x0017  0x0887
0x40:  0x0093  0x0046  0x0087  0x0887  0x0887  0x0082  0x0046  0x0097
0x50:  0x0096  0x0016  0x0893  0x0093  0x0816  0x0082  0x0046  0x0097