Annotation of sys/lib/libkern/arch/m68k/skpc.S, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: skpc.S,v 1.3 2003/06/02 23:28:08 millert Exp $ */
! 2: /* $NetBSD: skpc.S,v 1.2 1994/10/26 06:39:32 cgd Exp $ */
! 3:
! 4: /*
! 5: * Copyright (c) 1988 University of Utah.
! 6: * Copyright (c) 1980, 1990 The Regents of the University of California.
! 7: * All rights reserved.
! 8: *
! 9: * This code is derived from software contributed to Berkeley by
! 10: * the Systems Programming Group of the University of Utah Computer
! 11: * Science Department.
! 12: *
! 13: * Redistribution and use in source and binary forms, with or without
! 14: * modification, are permitted provided that the following conditions
! 15: * are met:
! 16: * 1. Redistributions of source code must retain the above copyright
! 17: * notice, this list of conditions and the following disclaimer.
! 18: * 2. Redistributions in binary form must reproduce the above copyright
! 19: * notice, this list of conditions and the following disclaimer in the
! 20: * documentation and/or other materials provided with the distribution.
! 21: * 3. Neither the name of the University nor the names of its contributors
! 22: * may be used to endorse or promote products derived from this software
! 23: * without specific prior written permission.
! 24: *
! 25: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
! 26: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
! 27: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
! 28: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
! 29: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
! 30: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
! 31: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
! 32: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
! 33: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
! 34: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
! 35: * SUCH DAMAGE.
! 36: *
! 37: * from: Utah Hdr: locore.s 1.58 91/04/22
! 38: * @(#)locore.s 7.11 (Berkeley) 5/9/91
! 39: */
! 40:
! 41: #include "DEFS.h"
! 42:
! 43: /*
! 44: * Emulate fancy VAX string operations:
! 45: * skpc(mask, count, startc)
! 46: */
! 47: ENTRY(skpc)
! 48: movl sp@(8),d0 | get length
! 49: jeq Lskdone | nothing to do, return
! 50: movb sp@(7),d1 | mask to use
! 51: movl sp@(12),a0 | where to start
! 52: subqw #1,d0 | adjust for dbcc
! 53: Lskloop:
! 54: cmpb a0@+,d1 | compate with mask
! 55: dbne d0,Lskloop | keep going til no more or zero
! 56: addqw #1,d0 | overshot by one
! 57: Lskdone:
! 58: rts
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