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      1 /*	$NetBSD: compat_setjmp.S,v 1.4 2025/05/03 19:55:32 riastradh 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  * William Jolitz.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. Neither the name of the University nor the names of its contributors
     19  *    may be used to endorse or promote products derived from this software
     20  *    without specific prior written permission.
     21  *
     22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     32  * SUCH DAMAGE.
     33  *
     34  *	from: @(#)setjmp.s	5.1 (Berkeley) 4/23/90
     35  */
     36 
     37 #include <machine/asm.h>
     38 #if defined(LIBC_SCCS)
     39 	RCSID("$NetBSD: compat_setjmp.S,v 1.4 2025/05/03 19:55:32 riastradh Exp $")
     40 #endif
     41 
     42 /*
     43  * C library -- _setjmp, _longjmp
     44  *
     45  *	longjmp(a,v)
     46  * will generate a "return(v)" from the last call to
     47  *	setjmp(a)
     48  * by restoring registers from the stack.
     49  * The previous signal state is restored.
     50  */
     51 
     52 ENTRY(setjmp)
     53 
     54 	PIC_PROLOGUE
     55 	pushl	$0
     56 	call	PIC_PLT(_C_LABEL(sigblock))
     57 	addl	$4,%esp
     58 	PIC_EPILOGUE
     59 
     60 	movl	4(%esp),%ecx
     61 	movl	0(%esp),%edx
     62 	movl	%edx, 0(%ecx)
     63 	movl	%ebx, 4(%ecx)
     64 	movl	%esp, 8(%ecx)
     65 	movl	%ebp,12(%ecx)
     66 	movl	%esi,16(%ecx)
     67 	movl	%edi,20(%ecx)
     68 	movl	%eax,24(%ecx)
     69 	xorl	%eax,%eax
     70 	ret
     71 END(setjmp)
     72 
     73 ENTRY(longjmp)
     74 	movl	4(%esp),%edx
     75 
     76 	PIC_PROLOGUE
     77 	pushl	24(%edx)
     78 	call	PIC_PLT(_C_LABEL(sigsetmask))
     79 	addl	$4,%esp
     80 	PIC_EPILOGUE
     81 
     82 	movl	4(%esp),%edx
     83 	movl	8(%esp),%eax
     84 	movl	0(%edx),%ecx
     85 	movl	4(%edx),%ebx
     86 	movl	8(%edx),%esp
     87 	movl	12(%edx),%ebp
     88 	movl	16(%edx),%esi
     89 	movl	20(%edx),%edi
     90 	testl	%eax,%eax
     91 	jnz	1f
     92 	incl	%eax
     93 1:	movl	%ecx,0(%esp)
     94 	ret
     95 END(longjmp)
     96