compat_13_machdep.c revision 1.4
1/* $NetBSD: compat_13_machdep.c,v 1.4 1999/01/31 09:21:18 mrg 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 struct compat_13_sys_sigreturn_args /* { 68 syscallarg(struct sigcontext13 *) sigcntxp; 69 } */ *uap = v; 70 struct sigcontext13 sc, *scp; 71 sigset_t mask; 72 struct trapframe *tf; 73 74 /* First ensure consistent stack state (see sendsig). */ 75 write_user_windows(); 76#if 0 77 /* Make sure our D$ is not polluted w/bad data */ 78 blast_vcache(); 79#endif 80 if (rwindow_save(p)) 81 sigexit(p, SIGILL); 82 83 scp = SCARG(uap, sigcntxp); 84 if ((vaddr_t)scp & 3 || (copyin((caddr_t)scp, &sc, sizeof sc) != 0)) 85 return (EFAULT); 86 scp = ≻ 87 88 tf = p->p_md.md_tf; 89 /* 90 * Only the icc bits in the psr are used, so it need not be 91 * verified. pc and npc must be multiples of 4. This is all 92 * that is required; if it holds, just do it. 93 */ 94 if (((scp->sc_pc | scp->sc_npc) & 3) != 0 || scp->sc_pc == 0 || scp->sc_npc == 0) 95#ifdef DEBUG 96 { 97 printf("sigreturn13: pc %p or npc %p invalid\n", scp->sc_pc, scp->sc_npc); 98 Debugger(); 99 return (EINVAL); 100 } 101#endif 102 return (EINVAL); 103 /* take only psr ICC field */ 104#ifdef __arch64__ 105 tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | scp->sc_tstate; 106#else 107 tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | PSRCC_TO_TSTATE(scp->sc_psr); 108#endif 109 tf->tf_pc = scp->sc_pc; 110 tf->tf_npc = scp->sc_npc; 111 tf->tf_global[1] = scp->sc_g1; 112 tf->tf_out[0] = scp->sc_o0; 113 tf->tf_out[6] = scp->sc_sp; 114 115 if (scp->sc_onstack & SS_ONSTACK) 116 p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK; 117 else 118 p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; 119 120 /* Restore signal mask */ 121 native_sigset13_to_sigset(&scp->sc_mask, &mask); 122 (void) sigprocmask1(p, SIG_SETMASK, &mask, 0); 123 124 return (EJUSTRETURN); 125} 126