1/*	$NetBSD: compat_13_sigreturn13.s,v 1.2 1999/11/10 00:01:32 thorpej Exp $	*/
2
3/*
4 * Copyright (c) 1988 University of Utah.
5 * Copyright (c) 1980, 1990, 1993
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * This code is derived from software contributed to Berkeley by
9 * the Systems Programming Group of the University of Utah Computer
10 * Science Department.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. All advertising materials mentioning features or use of this software
21 *    must display the following acknowledgement:
22 *	This product includes software developed by the University of
23 *	California, Berkeley and its contributors.
24 * 4. Neither the name of the University nor the names of its contributors
25 *    may be used to endorse or promote products derived from this software
26 *    without specific prior written permission.
27 *
28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
31 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
38 * SUCH DAMAGE.
39 *
40 * from: Utah $Hdr: locore.s 1.66 92/12/22$
41 *
42 *	@(#)locore.s	8.6 (Berkeley) 5/27/94
43 */
44
45/*
46 * NOTICE: This file is included by <m68k/m68k/sigreturn.s>.
47 */
48
49/*
50 * The compat_13_sigreturn13() syscall comes here.  It requires special
51 * handling because we must open a hole in the stack to fill in the
52 * (possibly much larger) original stack frame.
53 */
54ENTRY_NOPROFILE(m68k_compat_13_sigreturn13_stub)
55	lea	%sp@(-84),%sp		| leave enough space for largest frame
56	movl	%sp@(84),%sp@		| move up current 8 byte frame
57	movl	%sp@(88),%sp@(4)
58	movl	#84,%sp@-		| default: adjust by 84 bytes
59	moveml	#0xFFFF,%sp@-		| save user registers
60	movl	%usp,%a0		| save the user SP
61	movl	%a0,%sp@(FR_SP)		|   in the savearea
62	movl	#SYS_compat_13_sigreturn13,%sp@-	| push syscall number
63	jbsr	_C_LABEL(syscall)	| handle it
64	addql	#4,%sp			| pop syscall#
65	movl	%sp@(FR_SP),%a0		| grab and restore
66	movl	%a0,%usp		|   user SP
67	lea	%sp@(FR_HW),%a1		| pointer to HW frame
68	movw	%sp@(FR_ADJ),%d0	| do we need to adjust the stack?
69	jeq	Lc13sigr1		| no, just continue
70	moveq	#92,%d1			| total size
71	subw	%d0,%d1			|  - hole size = frame size
72	lea	%a1@(92),%a0		| destination
73	addw	%d1,%a1			| source
74	lsrw	#1,%d1			| convert to word count
75	subqw	#1,%d1			| minus 1 for dbf
76Lc13sigrlp:
77	movw	%a1@-,%a0@-		| copy a word
78	dbf	%d1,Lc13sigrlp		| continue
79	movl	%a0,%a1			| new HW frame base
80Lc13sigr1:
81	movl	%a1,%sp@(FR_SP)		| new SP value
82	moveml	%sp@+,#0x7FFF		| restore user registers
83	movl	%sp@,%sp		| and our SP
84	jra	_ASM_LABEL(rei)		| all done
85