compat_13_machdep.c revision 1.1 
1/*	$NetBSD: compat_13_machdep.c,v 1.1 1998/09/17 04:52:17 thorpej Exp $	*/
2
3/*-
4 * Copyright (c) 1996, 1997, 1998 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 of the Numerical Aerospace Simulation Facility,
9 * NASA Ames Research Center.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 *    must display the following acknowledgement:
21 *	This product includes software developed by the NetBSD
22 *	Foundation, Inc. and its contributors.
23 * 4. Neither the name of The NetBSD Foundation nor the names of its
24 *    contributors may be used to endorse or promote products derived
25 *    from this software without specific prior written permission.
26 *
27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37 * POSSIBILITY OF SUCH DAMAGE.
38 */
39
40#include <sys/param.h>
41#include <sys/systm.h>
42#include <sys/proc.h>
43#include <sys/user.h>
44#include <sys/kernel.h>
45#include <sys/mount.h>
46#include <sys/signal.h>
47#include <sys/signalvar.h>
48
49#include <sys/syscallargs.h>
50
51/*
52 * System call to cleanup state after a signal
53 * has been taken.  Reset signal mask and
54 * stack state from context left by sendsig (above),
55 * and return to the given trap frame (if there is one).
56 * Check carefully to make sure that the user has not
57 * modified the state to gain improper privileges or to cause
58 * a machine fault.
59 */
60/* ARGSUSED */
61int
62compat_13_sys_sigreturn(p, v, retval)
63	struct proc *p;
64	void *v;
65	register_t *retval;
66{
67#ifdef _LP64
68	panic("compat_13_sys_sigreturn");
69#else
70	struct compat_13_sys_sigreturn_args /* {
71		syscallarg(struct sigcontext13 *) sigcntxp;
72	} */ *uap = v;
73	struct sigcontext13 sc, *scp;
74	sigset_t mask;
75	struct trapframe *tf;
76
77	/* First ensure consistent stack state (see sendsig). */
78	write_user_windows();
79#if 0
80	/* Make sure our D$ is not polluted w/bad data */
81	blast_vcache();
82#endif
83	if (rwindow_save(p))
84		sigexit(p, SIGILL);
85
86	scp = SCARG(uap, sigcntxp);
87	f ((vaddr_t)scp & 3 || (copyin((caddr_t)scp, &sc, sizeof sc) != 0))
88		return (EFAULT);
89	scp = &sc;
90
91	tf = p->p_md.md_tf;
92	/*
93	 * Only the icc bits in the psr are used, so it need not be
94	 * verified.  pc and npc must be multiples of 4.  This is all
95	 * that is required; if it holds, just do it.
96	 */
97	if (((scp->sc_pc | scp->sc_npc) & 3) != 0)
98		return (EINVAL);
99	/* take only psr ICC field */
100	tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | PSRCC_TO_TSTATE(scp->sc_psr);
101	tf->tf_pc = scp->sc_pc;
102	tf->tf_npc = scp->sc_npc;
103	tf->tf_global[1] = scp->sc_g1;
104	tf->tf_out[0] = scp->sc_o0;
105	tf->tf_out[6] = scp->sc_sp;
106
107	if (scp->sc_onstack & SS_ONSTACK)
108		p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK;
109	else
110		p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK;
111
112	/* Restore signal mask */
113	native_sigset13_to_sigset(&scp->sc_mask, &mask);
114	(void) sigprocmask1(p, SIG_SETMASK, &mask, 0);
115
116	return (EJUSTRETURN);
117#endif /* _LP64 */
118}
119