diff options
Diffstat (limited to 'lib/libc')
| -rw-r--r-- | lib/libc/arch/m68k/string/swab.S | 55 |
1 files changed, 40 insertions, 15 deletions
diff --git a/lib/libc/arch/m68k/string/swab.S b/lib/libc/arch/m68k/string/swab.S index 4a93118be97..46ddf7cc3bd 100644 --- a/lib/libc/arch/m68k/string/swab.S +++ b/lib/libc/arch/m68k/string/swab.S @@ -1,23 +1,48 @@ +/* $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 1.3 1996/08/19 08:15:29 tholo Exp $" + .asciz "$OpenBSD: swab.S,v 1.4 2002/06/18 08:34:46 espie Exp $" #endif /* LIBC_SCCS */ ENTRY(swab) - movl sp@(4),a0 | source - movl sp@(8),a1 | destination - movl sp@(12),d0 | count - lsrl #1,d0 | count is in bytes; we need words - beq swdone - -swloop: - movw a0@+,d1 - rorw #8,d1 - movw d1,a1@+ - subql #1,d0 - bne swloop - -swdone: + 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 + |