1 /* $NetBSD: __sigtramp2.S,v 1.2 2006/01/06 04:38:10 uwe Exp $ */
4 * Copyright (c) 2003 The NetBSD Foundation, Inc.
7 * This code is derived from software contributed to The NetBSD Foundation
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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.
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
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28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
35 * The SH signal trampoline is invoked only to return from
36 * the signal; the kernel calls the signal handler directly.
38 * On entry, stack looks like:
41 * sp-> ucontext structure
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.
48 NENTRY(__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 */
54 SET_ENTRY_SIZE(__sigtramp_siginfo_2)