minix/lib/libc/arch/m68k/string/swab.S

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/* $NetBSD: swab.S,v 1.10 2013/07/18 21:37:47 matt Exp $ */
#include <machine/asm.h>
ENTRY(swab)
movl 4(%sp),%a0 | source
movl 8(%sp),%a1 | destination
movl 12(%sp),%d0 | count
lsrl #1,%d0 | count is in bytes; we need words
jeq swdone
swloop:
#ifdef __mcoldfire__
movb (%a0)+,1(%a1)
movb (%a0)+,(%a1)
addql #2,%a1
#else
movw (%a0)+,%d1
rorw #8,%d1
movw %d1,(%a1)+
#endif
subql #1,%d0
jne swloop
swdone:
rts
END(swab)