Home | History | Annotate | Line # | Download | only in x86_64
scanc.S revision 1.1.120.1 
      1  1.1.120.1   mjf /*	$NetBSD: scanc.S,v 1.1.120.1 2008/06/02 13:24:16 mjf Exp $	*/
      2        1.1  fvdl 
      3        1.1  fvdl /*-
      4        1.1  fvdl  * Copyright (c) 1998 The NetBSD Foundation, Inc.
      5        1.1  fvdl  * All rights reserved.
      6        1.1  fvdl  *
      7        1.1  fvdl  * This code is derived from software contributed to The NetBSD Foundation
      8        1.1  fvdl  * by Charles M. Hannum.
      9        1.1  fvdl  *
     10        1.1  fvdl  * Redistribution and use in source and binary forms, with or without
     11        1.1  fvdl  * modification, are permitted provided that the following conditions
     12        1.1  fvdl  * are met:
     13        1.1  fvdl  * 1. Redistributions of source code must retain the above copyright
     14        1.1  fvdl  *    notice, this list of conditions and the following disclaimer.
     15        1.1  fvdl  * 2. Redistributions in binary form must reproduce the above copyright
     16        1.1  fvdl  *    notice, this list of conditions and the following disclaimer in the
     17        1.1  fvdl  *    documentation and/or other materials provided with the distribution.
     18        1.1  fvdl  *
     19        1.1  fvdl  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20        1.1  fvdl  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21        1.1  fvdl  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22        1.1  fvdl  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23        1.1  fvdl  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24        1.1  fvdl  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25        1.1  fvdl  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26        1.1  fvdl  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27        1.1  fvdl  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28        1.1  fvdl  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29        1.1  fvdl  * POSSIBILITY OF SUCH DAMAGE.
     30        1.1  fvdl  */
     31        1.1  fvdl 
     32        1.1  fvdl /*
     33        1.1  fvdl  * Adapted for NetBSD/x86_64 by Frank van der Linden <fvdl (at) wasabisystems.com>
     34        1.1  fvdl  */
     35        1.1  fvdl 
     36        1.1  fvdl #include <machine/asm.h>
     37        1.1  fvdl 
     38        1.1  fvdl ENTRY(scanc)
     39        1.1  fvdl 	movq	%rdx,%r11
     40        1.1  fvdl 	movb	%cl,%dl
     41        1.1  fvdl 	movl	%edi,%ecx
     42        1.1  fvdl 	testl	%ecx,%ecx
     43        1.1  fvdl 	jz	2f
     44        1.1  fvdl 	movq	%r11,%rdi
     45        1.1  fvdl 	xorq	%rax,%rax
     46        1.1  fvdl 	cld
     47        1.1  fvdl 1:
     48        1.1  fvdl 	lodsb
     49        1.1  fvdl 	testb	%dl,(%rax,%rdi)
     50        1.1  fvdl 	jnz	2f
     51        1.1  fvdl 	decl	%ecx
     52        1.1  fvdl 	jnz	1b
     53        1.1  fvdl 2:
     54        1.1  fvdl 	movl	%ecx,%eax
     55        1.1  fvdl 	ret
     56