minix/lib/i86/em/em_inn.s
2005-04-21 14:53:53 +00:00

31 lines
357 B
ArmAsm
Executable file

.define .inn
.text
! #bytes in cx
! bit # in ax
.inn:
xor dx,dx
mov bx,#8
div bx
mov bx,sp
add bx,#2
add bx,ax
cmp ax,cx
jae 1f
movb al,(bx)
mov bx,dx
testb al,bits(bx)
jz 1f
mov ax,#1
jmp 2f
1:
xor ax,ax
2:
pop bx
add sp,cx
! ax is result
jmp (bx)
.data
bits:
.data1 1,2,4,8,16,32,64,128