1/*	$NetBSD: sigsetjmp.S,v 1.19 2024/04/04 00:46:41 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: sigsetjmp.S,v 1.19 2024/04/04 00:46:41 riastradh Exp $")
40#endif
41
42/*
43 * sigsetjmp(sigjmp_buf env@esp[4,8), savemask@esp[8,12))
44 *
45 * ELF symbol: __sigsetjmp14, because the size of sigjmp_buf changed on
46 * some platforms in 1.4.
47 */
48ENTRY(__sigsetjmp14)
49	/*
50	 * Save the callee-saves registers: %ebp, %ebx, %edi, %esi,
51	 * plus %esp and the return address on the stack since it
52	 * will be overwritten if the caller makes any subroutine
53	 * calls before siglongjmp.
54	 */
55	movl	4(%esp),%ecx		/* ecx := env */
56	movl	0(%esp),%edx		/* edx := return address */
57	movl	%edx,0(%ecx)
58	movl	%ebx,4(%ecx)
59	movl	%esp,8(%ecx)
60	movl	%ebp,12(%ecx)
61	movl	%esi,16(%ecx)
62	movl	%edi,20(%ecx)
63
64	/* Check if we should save the signal mask, and remember it. */
65	movl	8(%esp),%eax		/* eax := savemask */
66	movl	%eax,40(%ecx)
67	testl	%eax,%eax		/* savemask == 0? */
68	jz	2f			/* jump if savemask == 0 */
69
70	/* Get the signal mask. */
71	leal	24(%ecx),%edx
72
73	PIC_PROLOGUE
74	pushl	%edx			/* oset (signal mask saved to) */
75	pushl	$0			/* set := NULL */
76	pushl	$0			/* how := 0 (ignored) */
77#ifdef __PIC__
78	call	PIC_PLT(_C_LABEL(__sigprocmask14))
79#else
80	call	_C_LABEL(__sigprocmask14)
81#endif
82	addl	$12,%esp		/* pop sigprocmask args */
83	PIC_EPILOGUE
84
852:	xorl	%eax,%eax		/* return 0 first time around */
86	ret
87END(__sigsetjmp14)
88
89/*
90 * siglongjmp(sigjmp_buf env@esp[4,8), int val@[8,12))
91 *
92 * ELF symbol: __siglongjmp14, because the size of sigjmp_buf changed
93 * on some platforms in 1.4.
94 */
95ENTRY(__siglongjmp14)
96	/*
97	 * Restore the callee-saves registers: %ebp, %ebx, %edi, %esi,
98	 * plus %esp and the return address on the stack.
99	 */
100	movl	4(%esp),%edx		/* edx := env */
101	movl	8(%esp),%eax		/* eax := val */
102	movl	0(%edx),%ecx		/* ecx := return address */
103	movl	4(%edx),%ebx
104	movl	8(%edx),%esp
105	movl	12(%edx),%ebp
106	movl	16(%edx),%esi
107	movl	20(%edx),%edi
108	movl	%ecx,0(%esp)		/* restore return address */
109
110	/* Check to see if we need to restore the signal mask. */
111	cmpl	$0,40(%edx)		/* savemask == 0 */
112	jz	2f			/* jump if savemask == 0 */
113
114	/* Restore the signal mask. */
115	leal	24(%edx),%edx
116
117	pushl	%eax			/* save val@eax */
118
119	PIC_PROLOGUE
120	pushl	$0			/* oset := NULL */
121	pushl	%edx			/* set (signal mask restored from) */
122	pushl	$3			/* how := SIG_SETMASK */
123#ifdef __PIC__
124	call	PIC_PLT(_C_LABEL(__sigprocmask14))
125#else
126	call	_C_LABEL(__sigprocmask14)
127#endif
128	addl	$12,%esp		/* pop sigprocmask args */
129	PIC_EPILOGUE
130
131	popl	%eax			/* restore val@eax */
132
1332:	testl	%eax,%eax		/* val == 0? */
134	jz	3f			/* jump if val == 0 */
135	ret				/* return val@eax */
136
1373:	incl	%eax			/* val@eax := 1 */
138	ret				/* return val@eax */
139END(__siglongjmp14)
140