1/*	$NetBSD: linux_sigcode.S,v 1.2 2001/04/11 19:41:02 manu Exp $ */
2
3/*
4 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
5 * Copyright (C) 1995, 1996 TooLs GmbH.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by TooLs GmbH.
19 * 4. The name of TooLs GmbH may not be used to endorse or promote products
20 *    derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33
34/*
35 * The following code is just a copy from sys/arch/powerpc/powerpc/sigcode.S
36 * Obviously, there are little chance that it works for Linux emulation, so
37 * it will have to be rewritten.
38 * Emmanuel Dreyfus <p99dreyf@criens.u-psud.fr>
39 */
40
41#include <machine/asm.h>
42
43#include <compat/linux/linux_syscall.h>
44
45/*
46 * This is copied from sys/compat/linux/arch/powerpc/linux_machdep.h
47 */
48#define LINUX__SIGNAL_FRAMESIZE 64
49
50/*
51 * The following code gets copied to the top of the user stack on process
52 * execution.  It does signal trampolining on signal delivery.
53 *
54 * On entry r1 points to a struct sigframe at bottom of current stack.
55 * All other registers are unchanged.
56 *
57 * XXX Linux just does this:
58 *  0x38007777   li r0,0x7777
59 *  0x44000002   sc
60 */
61	.globl	_C_LABEL(linux_sigcode),_C_LABEL(linux_esigcode)
62_C_LABEL(linux_sigcode):
63	addi	1,1,-16			/* reserved space for callee */
64	blrl
65	addi	3,1,16+LINUX__SIGNAL_FRAMESIZE	/* compute &sf_sc */
66	li	0,LINUX_SYS_sigreturn
67	sc				/* linux_sys_sigreturn(scp) */
68	li	0,LINUX_SYS_exit
69	sc				/* linux_sys_exit(errno) */
70_C_LABEL(linux_esigcode):
71