compat_13_machdep.c revision 1.6
1/* $NetBSD: compat_13_machdep.c,v 1.6 1999/11/06 20:18:13 eeh 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#include <sparc64/sparc64/sigdebug.h> 51 52/* 53 * System call to cleanup state after a signal 54 * has been taken. Reset signal mask and 55 * stack state from context left by sendsig (above), 56 * and return to the given trap frame (if there is one). 57 * Check carefully to make sure that the user has not 58 * modified the state to gain improper privileges or to cause 59 * a machine fault. 60 */ 61/* ARGSUSED */ 62int 63compat_13_sys_sigreturn(p, v, retval) 64 struct proc *p; 65 void *v; 66 register_t *retval; 67{ 68 struct compat_13_sys_sigreturn_args /* { 69 syscallarg(struct sigcontext13 *) sigcntxp; 70 } */ *uap = v; 71 struct sigcontext13 sc, *scp; 72 sigset_t mask; 73 struct trapframe64 *tf; 74 75 /* First ensure consistent stack state (see sendsig). */ 76 write_user_windows(); 77#if 0 78 /* Make sure our D$ is not polluted w/bad data */ 79 blast_vcache(); 80#endif 81 if (rwindow_save(p)) { 82#ifdef DEBUG 83 printf("compat_13_sys_sigreturn: rwindow_save(%p) failed, sending SIGILL\n", p); 84 Debugger(); 85#endif 86 sigexit(p, SIGILL); 87 } 88#ifdef DEBUG 89 if (sigdebug & SDB_FOLLOW) { 90 printf("compat_13_sys_sigreturn: %s[%d], sigcntxp %p\n", 91 p->p_comm, p->p_pid, SCARG(uap, sigcntxp)); 92 if (sigdebug & SDB_DDB) Debugger(); 93 } 94#endif 95 96 scp = SCARG(uap, sigcntxp); 97 if ((vaddr_t)scp & 3 || (copyin((caddr_t)scp, &sc, sizeof sc) != 0)) 98#ifdef DEBUG 99 { 100 printf("compat_13_sys_sigreturn: copyin failed: scp=%p\n", scp); 101 Debugger(); 102 return (EFAULT); 103 } 104#else 105 return (EFAULT); 106#endif 107 108 scp = ≻ 109 110 tf = p->p_md.md_tf; 111 /* 112 * Only the icc bits in the psr are used, so it need not be 113 * verified. pc and npc must be multiples of 4. This is all 114 * that is required; if it holds, just do it. 115 */ 116 if (((scp->sc_pc | scp->sc_npc) & 3) != 0 || scp->sc_pc == 0 || scp->sc_npc == 0) 117#ifdef DEBUG 118 { 119 printf("compat_13_sys_sigreturn: pc %p or npc %p invalid\n", scp->sc_pc, scp->sc_npc); 120 Debugger(); 121 return (EINVAL); 122 } 123#endif 124 return (EINVAL); 125 /* take only psr ICC field */ 126#ifdef __arch64__ 127 tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | scp->sc_tstate; 128#else 129 tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | PSRCC_TO_TSTATE(scp->sc_psr); 130#endif 131 tf->tf_pc = scp->sc_pc; 132 tf->tf_npc = scp->sc_npc; 133 tf->tf_global[1] = scp->sc_g1; 134 tf->tf_out[0] = scp->sc_o0; 135 tf->tf_out[6] = scp->sc_sp; 136#ifdef DEBUG 137 if (sigdebug & SDB_FOLLOW) { 138 printf("compat_13_sys_sigreturn: return trapframe pc=%p sp=%p tstate=%llx\n", 139 (vaddr_t)tf->tf_pc, (vaddr_t)tf->tf_out[6], tf->tf_tstate); 140 if (sigdebug & SDB_DDB) Debugger(); 141 } 142#endif 143 144 if (scp->sc_onstack & SS_ONSTACK) 145 p->p_sigacts->ps_sigstk.ss_flags |= SS_ONSTACK; 146 else 147 p->p_sigacts->ps_sigstk.ss_flags &= ~SS_ONSTACK; 148 149 /* Restore signal mask */ 150 native_sigset13_to_sigset(&scp->sc_mask, &mask); 151 (void) sigprocmask1(p, SIG_SETMASK, &mask, 0); 152 153 return (EJUSTRETURN); 154} 155