1 /* $NetBSD: compat_13_machdep.c,v 1.12 2009/11/21 04:16:51 rmind 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 *
20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
30 * POSSIBILITY OF SUCH DAMAGE.
31 */
32
33 #include <sys/cdefs.h>
34 __KERNEL_RCSID(0, "$NetBSD: compat_13_machdep.c,v 1.12 2009/11/21 04:16:51 rmind Exp $");
35
36 #ifdef _KERNEL_OPT
37 #include "opt_compat_netbsd.h"
38 #endif
39
40 #include <sys/param.h>
41 #include <sys/systm.h>
42 #include <sys/proc.h>
43 #include <sys/kernel.h>
44 #include <sys/mount.h>
45 #include <sys/signal.h>
46 #include <sys/signalvar.h>
47
48 #include <compat/sys/signal.h>
49 #include <compat/sys/signalvar.h>
50
51 #include <sys/syscallargs.h>
52
53 /*
54 * System call to cleanup state after a signal
55 * has been taken. Reset signal mask and
56 * stack state from context left by sendsig (above),
57 * and return to the given trap frame (if there is one).
58 * Check carefully to make sure that the user has not
59 * modified the state to gain improper privileges or to cause
60 * a machine fault.
61 */
62 /* ARGSUSED */
63 int
compat_13_sys_sigreturn(struct lwp * l,const struct compat_13_sys_sigreturn_args * uap,register_t * retval)64 compat_13_sys_sigreturn(struct lwp *l, const struct compat_13_sys_sigreturn_args *uap, register_t *retval)
65 {
66 /* {
67 syscallarg(struct sigcontext13 *) sigcntxp;
68 } */
69 struct proc *p = l->l_proc;
70 struct sigcontext13 sc, *scp;
71 sigset_t mask;
72 struct trapframe *tf;
73 int error;
74
75 /* First ensure consistent stack state (see sendsig). */
76 write_user_windows();
77 if (rwindow_save(l)) {
78 mutex_enter(p->p_lock);
79 sigexit(l, SIGILL);
80 }
81
82 if ((error = copyin(SCARG(uap, sigcntxp), &sc, sizeof sc)) != 0)
83 return (error);
84 scp = ≻
85
86 tf = l->l_md.md_tf;
87 /*
88 * Only the icc bits in the psr are used, so it need not be
89 * verified. pc and npc must be multiples of 4. This is all
90 * that is required; if it holds, just do it.
91 */
92 if (((scp->sc_pc | scp->sc_npc) & 3) != 0)
93 return (EINVAL);
94 /* take only psr ICC field */
95 tf->tf_psr = (tf->tf_psr & ~PSR_ICC) | (scp->sc_psr & PSR_ICC);
96 tf->tf_pc = scp->sc_pc;
97 tf->tf_npc = scp->sc_npc;
98 tf->tf_global[1] = scp->sc_g1;
99 tf->tf_out[0] = scp->sc_o0;
100 tf->tf_out[6] = scp->sc_sp;
101
102 mutex_enter(p->p_lock);
103 if (scp->sc_onstack & SS_ONSTACK)
104 l->l_sigstk.ss_flags |= SS_ONSTACK;
105 else
106 l->l_sigstk.ss_flags &= ~SS_ONSTACK;
107 /* Restore signal mask */
108 native_sigset13_to_sigset(&scp->sc_mask, &mask);
109 (void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
110 mutex_exit(p->p_lock);
111
112 return (EJUSTRETURN);
113 }
114