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Annotation of sys/lib/libkern/arch/m68k/strcmp.S, Revision 1.1.1.1

1.1       nbrk        1: /*     $OpenBSD: strcmp.S,v 1.3 2003/06/02 23:28:08 millert Exp $      */
                      2:
                      3: /*-
                      4:  * Copyright (c) 1990 The Regents of the University of California.
                      5:  * All rights reserved.
                      6:  *
                      7:  * This code is derived from software contributed to Berkeley by
                      8:  * the Systems Programming Group of the University of Utah Computer
                      9:  * Science Department.
                     10:  *
                     11:  * Redistribution and use in source and binary forms, with or without
                     12:  * modification, are permitted provided that the following conditions
                     13:  * are met:
                     14:  * 1. Redistributions of source code must retain the above copyright
                     15:  *    notice, this list of conditions and the following disclaimer.
                     16:  * 2. Redistributions in binary form must reproduce the above copyright
                     17:  *    notice, this list of conditions and the following disclaimer in the
                     18:  *    documentation and/or other materials provided with the distribution.
                     19:  * 3. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  */
                     35:
                     36: #if defined(LIBC_SCCS) && !defined(lint)
                     37:        .text
                     38:        /*.asciz "from: @(#)strcmp.s    5.1 (Berkeley) 5/12/90"*/
                     39:        .asciz "$OpenBSD: strcmp.S,v 1.3 2003/06/02 23:28:08 millert Exp $"
                     40: #endif /* LIBC_SCCS and not lint */
                     41:
                     42: #include "DEFS.h"
                     43:
                     44: /*
                     45:  * NOTE: this guy returns result compatible with the VAX assembly version.
                     46:  * The C version on the portable gen directory returns different results
                     47:  * (different signs!) when comparing chars with the high bit on.  Who is
                     48:  * right??
                     49:  */
                     50: ENTRY(strcmp)
                     51:        movl    sp@(4),a0               | a0 = string1
                     52:        movl    sp@(8),a1               | a1 = string2
                     53: scloop:
                     54:        movb    a0@+,d0                 | get *string1
                     55:        cmpb    a1@+,d0                 | compare a byte
                     56:        bne     scexit                  | not equal, break out
                     57:        tstb    d0                      | at end of string1?
                     58:        bne     scloop                  | no, keep going
                     59:        moveq   #0,d0                   | strings are equal
                     60:        rts
                     61: scexit:
                     62:        subb    a1@-,d0                 | *string1 - *string2
                     63:        extbl   d0
                     64:        rts