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/* $OpenBSD: swab.S,v 1.4 2002/06/18 08:34:46 espie Exp $ */
/*
* Copyright (c) 2002 Marc Espie.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE OPENBSD PROJECT AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OPENBSD
* PROJECT OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "DEFS.h"
#if defined(LIBC_SCCS)
.text
.asciz "$OpenBSD: swab.S,v 1.4 2002/06/18 08:34:46 espie Exp $"
#endif /* LIBC_SCCS */
ENTRY(swab)
movl sp@(12),d1 | #bytes
lsrl #1,d1 | -> #words
beq swab_end
subql #1,d1 | for proper dbf behaviour
movl sp@(4),a0 | src
movl sp@(8),a1 | and dst
swab_loop:
movw a0@+,d0
rorw #8,d0
movw d0,a1@+
dbf d1,swab_loop
swab_end:
rts
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