1 /* $NetBSD: compat_13_machdep.c,v 1.2 2000/12/22 22:58:55 jdolecek 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 "opt_compat_netbsd.h" 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/proc.h> 45 #include <sys/user.h> 46 #include <sys/kernel.h> 47 #include <sys/mount.h> 48 #include <sys/signal.h> 49 #include <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(p, v, retval) 65 struct proc *p; 66 void *v; 67 register_t *retval; 68 { 69 struct compat_13_sys_sigreturn_args /* { 70 syscallarg(struct sigcontext13 *) sigcntxp; 71 } */ *uap = v; 72 struct sigcontext13 sc, *scp; 73 sigset_t mask; 74 struct trapframe *tf; 75 int error; 76 77 /* First ensure consistent stack state (see sendsig). */ 78 write_user_windows(); 79 if (rwindow_save(p)) 80 sigexit(p, SIGILL); 81 82 if ((error = copyin(SCARG(uap, sigcntxp), &sc, sizeof sc)) != 0) 83 return (error); 84 scp = ≻ 85 86 tf = p->p_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 if (scp->sc_onstack & SS_ONSTACK) 103 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 104 else 105 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 106 107 /* Restore signal mask */ 108 native_sigset13_to_sigset(&scp->sc_mask, &mask); 109 (void) sigprocmask1(p, SIG_SETMASK, &mask, 0); 110 111 return (EJUSTRETURN); 112 } 113