1/*	$NetBSD: __sigtramp2.S,v 1.2 2006/01/06 04:38:10 uwe Exp $ */
2
3/*-
4 * Copyright (c) 2003 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Jason R. Thorpe.
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 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include "SYS.h"
33
34/*
35 * The SH signal trampoline is invoked only to return from
36 * the signal; the kernel calls the signal handler directly.
37 *
38 * On entry, stack looks like:
39 *
40 *		siginfo structure
41 *	sp->	ucontext structure
42 *
43 * NB: This order is different from what other ports use (siginfo at
44 * the top of the stack), because we want to avoid wasting two
45 * instructions to skip to the ucontext.  Not that this order really
46 * matters, but I think this inconsistency deserves an explanation.
47 */
48NENTRY(__sigtramp_siginfo_2)
49	mov	r15, r4			/* get pointer to ucontext */
50	SYSTRAP(setcontext)		/* and call setcontext() */
51	mov	r0, r4			/* exit with errno */
52	SYSTRAP(exit)			/* if sigreturn fails */
53
54	SET_ENTRY_SIZE(__sigtramp_siginfo_2)
55