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      1 /*	$NetBSD: _setjmp.S,v 1.2 2014/05/22 15:01:56 uebayasi Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2001 Wasabi Systems, Inc.
      5  * All rights reserved.
      6  *
      7  * Written by Frank van der Linden for Wasabi Systems, Inc.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer in the
     16  *    documentation and/or other materials provided with the distribution.
     17  * 3. All advertising materials mentioning features or use of this software
     18  *    must display the following acknowledgement:
     19  *      This product includes software developed for the NetBSD Project by
     20  *      Wasabi Systems, Inc.
     21  * 4. The name of Wasabi Systems, Inc. may not be used to endorse
     22  *    or promote products derived from this software without specific prior
     23  *    written permission.
     24  *
     25  * THIS SOFTWARE IS PROVIDED BY WASABI SYSTEMS, INC. ``AS IS'' AND
     26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     27  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     28  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL WASABI SYSTEMS, INC
     29  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     30  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     31  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     32  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     33  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     34  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     35  * POSSIBILITY OF SUCH DAMAGE.
     36  */
     37 
     38 
     39 #include <machine/asm.h>
     40 #include <machine/setjmp.h>
     41 #if defined(LIBC_SCCS)
     42 	RCSID("$NetBSD: _setjmp.S,v 1.2 2014/05/22 15:01:56 uebayasi Exp $")
     43 #endif
     44 
     45 /*
     46  * C library -- _setjmp, _longjmp
     47  *
     48  *	_longjmp(a,v)
     49  * will generate a "return(v)" from the last call to
     50  *	_setjmp(a)
     51  * by restoring registers from the stack.
     52  * The previous signal state is NOT restored.
     53  */
     54 
     55 ENTRY(_setjmp)
     56 	movq    (%rsp),%r11
     57 	movq    %rbx,(_JB_RBX * 8)(%rdi)
     58 	movq    %rbp,(_JB_RBP * 8)(%rdi)
     59 	movq    %r12,(_JB_R12 * 8)(%rdi)
     60 	movq    %r13,(_JB_R13 * 8)(%rdi)
     61 	movq    %r14,(_JB_R14 * 8)(%rdi)
     62 	movq    %r15,(_JB_R15 * 8)(%rdi)
     63 	movq    %rsp,(_JB_RSP * 8)(%rdi)
     64 	movq    %r11,(_JB_PC  * 8)(%rdi)
     65 
     66 	xorl	%eax,%eax
     67 	ret
     68 END(_setjmp)
     69 
     70 ENTRY(_longjmp)
     71 	movq    (_JB_RBX * 8)(%rdi),%rbx
     72 	movq    (_JB_RBP * 8)(%rdi),%rbp
     73 	movq    (_JB_R12 * 8)(%rdi),%r12
     74 	movq    (_JB_R13 * 8)(%rdi),%r13
     75 	movq    (_JB_R14 * 8)(%rdi),%r14
     76 	movq    (_JB_R15 * 8)(%rdi),%r15
     77 	movq    (_JB_RSP * 8)(%rdi),%rsp
     78 	movq    (_JB_PC  * 8)(%rdi),%r11
     79 
     80 	movl	%esi,%eax
     81 	testl	%eax,%eax
     82 	jnz	1f
     83 	incl	%eax
     84 1:	movq	%r11,0(%rsp)
     85 	ret
     86 END(_longjmp)
     87