Annotation of sys/lib/libkern/arch/m68k/scanc.S, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: scanc.S,v 1.3 2003/06/02 23:28:08 millert Exp $ */
! 2: /* $NetBSD: scanc.S,v 1.2 1994/10/26 06:39:31 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: * scanc(count, startc, table, mask)
! 46: */
! 47: ENTRY(scanc)
! 48: movl sp@(4),d0 | get length
! 49: jeq Lscdone | nothing to do, return
! 50: movl sp@(8),a0 | start of scan
! 51: movl sp@(12),a1 | table to compare with
! 52: movb sp@(19),d1 | and mask to use
! 53: movw d2,sp@- | need a scratch register
! 54: clrw d2 | clear it out
! 55: subqw #1,d0 | adjust for dbra
! 56: Lscloop:
! 57: movb a0@+,d2 | get character
! 58: movb a1@(0,d2:w),d2 | get table entry
! 59: andb d1,d2 | mask it
! 60: dbne d0,Lscloop | keep going til no more or non-zero
! 61: addqw #1,d0 | overshot by one
! 62: movw sp@+,d2 | restore scratch
! 63: Lscdone:
! 64: rts
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