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28 lines
445 B
ArmAsm
28 lines
445 B
ArmAsm
/* $NetBSD: swab.S,v 1.11 2014/03/18 18:20:37 riastradh Exp $ */
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#include <machine/asm.h>
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ENTRY(swab)
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movl 4(%sp),%a0 | source
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movl 8(%sp),%a1 | destination
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movl 12(%sp),%d0 | count
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lsrl #1,%d0 | count is in bytes; we need words
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jeq swdone
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swloop:
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#ifdef __mcoldfire__
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movb (%a0)+,1(%a1)
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movb (%a0)+,(%a1)
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addql #2,%a1
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#else
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movw (%a0)+,%d1
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rorw #8,%d1
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movw %d1,(%a1)+
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#endif
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subql #1,%d0
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jne swloop
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swdone:
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rts
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END(swab)
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