52 lines
570 B
ArmAsm
52 lines
570 B
ArmAsm
.define .ror4
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.sect .text
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.sect .rom
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.sect .data
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.sect .bss
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.sect .text
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! Rotate 4 bytes right
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! Expects in de-reg: number of rotates
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! Expects on stack: operand
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! Yields on stack: result
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.ror4: pop h
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shld .retadr
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mov h,b
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mov l,c
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shld .bcreg
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pop h ! low-order bytes of operand
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pop b ! high order bytes of operand
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mov a,e
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ani 31
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jz 2f
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mov e,a
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mov a,l
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rar
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1: mov a,b
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rar
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mov b,a
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mov a,c
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rar
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mov c,a
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mov a,h
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rar
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mov h,a
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mov a,l
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rar
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mov l,a
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dcr e
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jnz 1b ! keep looping
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2: push b
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push h
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lhld .bcreg
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mov b,h
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mov c,l
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lhld .retadr
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pchl
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