1 /* $NetBSD: compat_13_machdep.c,v 1.24 2017/08/22 09:12:49 maxv 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 1.24 2017/08/22 09:12:49 maxv Exp $");
35
36 #ifdef _KERNEL_OPT
37 #include "opt_ddb.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 <sys/syscallargs.h>
49 #include <sparc64/sparc64/sigdebug.h>
50
51 #include <compat/sys/signal.h>
52 #include <compat/sys/signalvar.h>
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 sigcontext13 sc, *scp;
70 struct trapframe64 *tf;
71 struct proc *p = l->l_proc;
72 sigset_t mask;
73
74 /* First ensure consistent stack state (see sendsig). */
75 write_user_windows();
76 if (rwindow_save(l)) {
77 #ifdef DEBUG
78 printf("compat_13_sys_sigreturn: rwindow_save(%p) failed, sending SIGILL\n", l);
79 #ifdef DDB
80 Debugger();
81 #endif
82 #endif
83 mutex_enter(p->p_lock);
84 sigexit(l, SIGILL);
85 }
86 #ifdef DEBUG
87 if (sigdebug & SDB_FOLLOW) {
88 printf("compat_13_sys_sigreturn: %s[%d], sigcntxp %p\n",
89 p->p_comm, p->p_pid, SCARG(uap, sigcntxp));
90 #ifdef DDB
91 if (sigdebug & SDB_DDB) Debugger();
92 #endif
93 }
94 #endif
95
96 scp = SCARG(uap, sigcntxp);
97 if ((vaddr_t)scp & 3 || (copyin((void *)scp, &sc, sizeof sc) != 0))
98 #ifdef DEBUG
99 {
100 printf("compat_13_sys_sigreturn: copyin failed: scp=%p\n", scp);
101 #ifdef DDB
102 Debugger();
103 #endif
104 return (EFAULT);
105 }
106 #else
107 return (EFAULT);
108 #endif
109
110 scp = ≻
111
112 tf = l->l_md.md_tf;
113 /*
114 * Only the icc bits in the psr are used, so it need not be
115 * verified. pc and npc must be multiples of 4. This is all
116 * that is required; if it holds, just do it.
117 */
118 if (((scp->sc_pc | scp->sc_npc) & 3) != 0 || scp->sc_pc == 0 || scp->sc_npc == 0)
119 #ifdef DEBUG
120 {
121 printf("compat_13_sys_sigreturn: pc %p or npc %p invalid\n",
122 (void *)scp->sc_pc, (void *)scp->sc_npc);
123 #ifdef DDB
124 Debugger();
125 #endif
126 return (EINVAL);
127 }
128 #endif
129 return (EINVAL);
130 /* take only psr ICC field */
131 #ifdef __arch64__
132 tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | (scp->sc_tstate & TSTATE_CCR);
133 #else
134 tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | PSRCC_TO_TSTATE(scp->sc_psr);
135 #endif
136 tf->tf_pc = scp->sc_pc;
137 tf->tf_npc = scp->sc_npc;
138 tf->tf_global[1] = scp->sc_g1;
139 tf->tf_out[0] = scp->sc_o0;
140 tf->tf_out[6] = scp->sc_sp;
141 #ifdef DEBUG
142 if (sigdebug & SDB_FOLLOW) {
143 printf("compat_13_sys_sigreturn: return trapframe pc=%llx sp=%llx tstate=%llx\n",
144 (long long)tf->tf_pc, (long long)tf->tf_out[6],
145 (long long)tf->tf_tstate);
146 #ifdef DDB
147 if (sigdebug & SDB_DDB) Debugger();
148 #endif
149 }
150 #endif
151
152 mutex_enter(p->p_lock);
153 if (scp->sc_onstack & SS_ONSTACK)
154 l->l_sigstk.ss_flags |= SS_ONSTACK;
155 else
156 l->l_sigstk.ss_flags &= ~SS_ONSTACK;
157
158 /* Restore signal mask */
159 native_sigset13_to_sigset(&scp->sc_mask, &mask);
160 (void) sigprocmask1(l, SIG_SETMASK, &mask, 0);
161 mutex_exit(p->p_lock);
162
163 return (EJUSTRETURN);
164 }
165