42 lines
598 B
ArmAsm
42 lines
598 B
ArmAsm
.define .sts
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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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! use trp.z
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! object size given by 2-byte integer on
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! top of stack.
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! parameters:
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! on stack
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! checks if #bytes is even or 1,
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! else traps
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.sts:
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pop ix ! save return address
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pop de ! # bytes to transfer
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pop hl ! destination address
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srl d ! divide de by 2
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rr e
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jr nc,1f ! see if it was odd
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ld a,e ! yes, must be 1
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or d
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jr nz,.trp.z ! no, error
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pop de ! transfer 1 byte,
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! padded with zeroes
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ld (hl),e
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jp (ix)
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1:
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pop bc
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ld (hl), c
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inc hl
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ld (hl),b
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inc hl
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dec de
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ld a,e
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or d
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jr nz,1b
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jp (ix)
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