NetBSD/sys/lib/libkern/m68k/strcmp.S

67 lines
2.8 KiB
ArmAsm

/*-
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* the Systems Programming Group of the University of Utah Computer
* Science Department.
*
* 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
.text
/*.asciz "from: @(#)strcmp.s 5.1 (Berkeley) 5/12/90"*/
.asciz "$Id: strcmp.S,v 1.1 1994/03/29 07:14:54 chopps Exp $"
#endif /* LIBC_SCCS and not lint */
#include "DEFS.h"
/*
* NOTE: this guy returns result compatible with the VAX assembly version.
* The C version on the portable gen directory returns different results
* (different signs!) when comparing chars with the high bit on. Who is
* right??
*/
ENTRY(strcmp)
movl sp@(4),a0 /* a0 = string1 */
movl sp@(8),a1 /* a1 = string2 */
scloop:
movb a0@+,d0 /* get *string1 */
cmpb a1@+,d0 /* compare a byte */
jne scexit /* not equal, break out */
tstb d0 /* at end of string1? */
jne scloop /* no, keep going */
moveq #0,d0 /* strings are equal */
rts
scexit:
subb a1@-,d0 /* *string1 - *string2 */
extbl d0
rts