27 lines
457 B
ArmAsm
27 lines
457 B
ArmAsm
#include "setarch.h"
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#include "defines.h"
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; dst A0
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; src A1
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; len A2
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.global ___reg_memcpy
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___reg_memcpy:
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MOVP A0P,A3P ; keep copy of result
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ADDP A2P,A0P ; point to end of dst
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ADDP A2P,A1P ; point to end of src
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CMPP A0P,A3P ; see if anything to do
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beq quit
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loop: subs #1,A1P ; point to byte
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mov.b @A1P,A2L ; get byte
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mov.b A2L,@-A0P ; save byte
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CMPP A0P,A3P ; at the front again ?
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bne loop
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; return with A0 pointing to dst
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quit: rts
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