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 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