xref: /freebsd-9.3-release/lib/libc/powerpc/gen/sigsetjmp.S

/*-
 * Copyright (c) 2002 Peter Grehan.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */
/*      $NetBSD: sigsetjmp.S,v 1.4 1998/10/03 12:30:38 tsubai Exp $     */

#include <machine/asm.h>
__FBSDID("$FreeBSD$");

/*
 * C library -- sigsetjmp, siglongjmp
 *
 *      siglongjmp(a,v)
 * will generate a "return(v?v:1)" from the last call to
 *      sigsetjmp(a, savemask)
 * by restoring registers from the stack.
 * The previous signal state is restored if savemask is non-zero
 *
 * jmpbuf layout:
 *     +------------+
 *     |  savemask  |
 *     +------------+
 *     | sig state  |
 *     |            |
 *     | (4 words)  |
 *     |            |
 *     +------------+
 *     | saved regs |
 *     |    ...     |
 */


#include <sys/syscall.h>

ENTRY(sigsetjmp)
	mr	%r6,%r3
	stw	%r4,0(%r3)
	or.	%r7,%r4,%r4
	beq	1f
	li	%r3,1			/* SIG_BLOCK, but doesn't matter */
					/*            since set == NULL  */
	li	%r4,0			/* set = NULL */
	mr	%r5,%r6			/* &oset */
	addi	%r5,%r5,4
	li	%r0, SYS_sigprocmask   /* sigprocmask(SIG_BLOCK, NULL, &oset)*/
	sc				/* assume no error       XXX */
1:
	mflr	%r11
	mfcr	%r12
	mr	%r10,%r1
	mr	%r9,%r2
	stmw	%r9,20(%r6)
	li	%r3,0
	blr

ENTRY(siglongjmp)
	lmw	%r9,20(%r3)
	lwz	%r7,0(%r3)
	mr	%r6,%r4
	mtlr	%r11
	mtcr	%r12
	mr	%r1,%r10
	or.	%r7,%r7,%r7
	beq	1f
	mr	%r4,%r3
	li	%r3,3			/* SIG_SETMASK */
	addi	%r4,%r4,4		/* &set */
	li	%r5,0			/* oset = NULL */
	li	%r0,SYS_sigprocmask	/* sigprocmask(SIG_SET, &set, NULL) */
	sc				/* assume no error       XXX */
1:
	or.	%r3,%r6,%r6
	bnelr
	li	%r3,1
	blr

	.section .note.GNU-stack,"",%progbits