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