1/*	$NetBSD: compat_13_sigreturn13.s,v 1.8 2024/01/17 12:19:06 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. Neither the name of the University nor the names of its contributors
21 *    may be used to endorse or promote products derived from this software
22 *    without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 *
36 * from: Utah $Hdr: locore.s 1.66 92/12/22$
37 *
38 *	@(#)locore.s	8.6 (Berkeley) 5/27/94
39 */
40
41#include <machine/asm.h>
42
43#include "assym.h"
44
45	.file	"compat_13_sigreturn13.s"
46	.text
47
48/*
49 * The compat_13_sigreturn13() syscall comes here.  It requires special
50 * handling because we must open a hole in the stack to fill in the
51 * (possibly much larger) original stack frame.
52 */
53ENTRY_NOPROFILE(m68k_compat_13_sigreturn13_stub)
54	lea	-84(%sp),%sp		| leave enough space for largest frame
55	movl	84(%sp),(%sp)		| move up current 8 byte frame
56	movl	88(%sp),4(%sp)
57	movl	#84,-(%sp)		| default: adjust by 84 bytes
58	moveml	#0xFFFF,-(%sp)		| save user registers
59	movl	%usp,%a0		| save the user SP
60	movl	%a0,FR_SP(%sp)		|   in the savearea
61	movl	#SYS_compat_13_sigreturn13,-(%sp)	| push syscall number
62	jbsr	_C_LABEL(syscall)	| handle it
63	addql	#4,%sp			| pop syscall#
64	movl	FR_SP(%sp),%a0		| grab and restore
65	movl	%a0,%usp		|   user SP
66	lea	FR_HW(%sp),%a1		| pointer to HW frame
67	movw	FR_ADJ(%sp),%d0		| do we need to adjust the stack?
68	jeq	2f			| no, just continue
69	moveq	#92,%d1			| total size
70	subw	%d0,%d1			|  - hole size = frame size
71	lea	92(%a1),%a0		| destination
72	addw	%d1,%a1			| source
73	lsrw	#1,%d1			| convert to word count
74	subqw	#1,%d1			| minus 1 for dbf
751:
76	movw	-(%a1),-(%a0)		| copy a word
77	dbf	%d1,1b			| continue
78	movl	%a0,%a1			| new HW frame base
792:
80	movl	%a1,FR_SP(%sp)		| new SP value
81	moveml	(%sp)+,#0x7FFF		| restore user registers
82	movl	(%sp),%sp		| and our SP
83	jra	_ASM_LABEL(rei)		| all done
84