sigsetjmp.S revision 217398 
1/*-
2 * Copyright (c) 2002 Peter Grehan.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26/*      $NetBSD: sigsetjmp.S,v 1.4 1998/10/03 12:30:38 tsubai Exp $     */
27
28#include <machine/asm.h>
29__FBSDID("$FreeBSD: head/lib/libc/powerpc/gen/sigsetjmp.S 217398 2011-01-14 11:33:40Z kib $");
30
31/*
32 * C library -- sigsetjmp, siglongjmp
33 *
34 *      siglongjmp(a,v)
35 * will generate a "return(v?v:1)" from the last call to
36 *      sigsetjmp(a, savemask)
37 * by restoring registers from the stack.
38 * The previous signal state is restored if savemask is non-zero
39 *
40 * jmpbuf layout:
41 *     +------------+
42 *     |  savemask  |
43 *     +------------+
44 *     | sig state  |
45 *     |            |
46 *     | (4 words)  |
47 *     |            |
48 *     +------------+
49 *     | saved regs |
50 *     |    ...     |
51 */
52
53
54#include <sys/syscall.h>
55
56ENTRY(sigsetjmp)
57	mr	%r6,%r3
58	stw	%r4,0(%r3)
59	or.	%r7,%r4,%r4
60	beq	1f
61	li	%r3,1			/* SIG_BLOCK, but doesn't matter */
62					/*            since set == NULL  */
63	li	%r4,0			/* set = NULL */
64	mr	%r5,%r6			/* &oset */
65	addi	%r5,%r5,4
66	li	%r0, SYS_sigprocmask   /* sigprocmask(SIG_BLOCK, NULL, &oset)*/
67	sc				/* assume no error       XXX */
681:
69	mflr	%r11
70	mfcr	%r12
71	mr	%r10,%r1
72	mr	%r9,%r2
73	stmw	%r9,20(%r6)
74	li	%r3,0
75	blr
76
77ENTRY(siglongjmp)
78	lmw	%r9,20(%r3)
79	lwz	%r7,0(%r3)
80	mr	%r6,%r4
81	mtlr	%r11
82	mtcr	%r12
83	mr	%r2,%r9
84	mr	%r1,%r10
85	or.	%r7,%r7,%r7
86	beq	1f
87	mr	%r4,%r3
88	li	%r3,3			/* SIG_SETMASK */
89	addi	%r4,%r4,4		/* &set */
90	li	%r5,0			/* oset = NULL */
91	li	%r0,SYS_sigprocmask	/* sigprocmask(SIG_SET, &set, NULL) */
92	sc				/* assume no error       XXX */
931:
94	or.	%r3,%r6,%r6
95	bnelr
96	li	%r3,1
97	blr
98
99	.section .note.GNU-stack,"",%progbits
100