31 lines
477 B
ArmAsm
31 lines
477 B
ArmAsm
.define blm
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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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!size in R0
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blm:
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popl saveret, *RR14
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ldm savereg, R4, $10
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ldk R2, $0
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ld R4, R2
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pop R3, *RR14 !RR2: dst address
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pop R5, *RR14 !RR4: src address
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ld R1, R0
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sra R0
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jr EQ, 2f
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!now avoid wrong copy in case the pieces overlap
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cp R5, R3
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jr EQ, 2f
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jr LT, 1f
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ldir *RR2, *RR4, R0
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jr 2f
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1: dec R1, $2
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add R3, R1
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add R5, R1
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lddr *RR2, *RR4, R0
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2: ldm R4, savereg, $10
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pushl *RR14, saveret
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ret
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