compat_13_machdep.c revision 1.18
1/* $NetBSD: compat_13_machdep.c,v 1.18 2007/03/04 06:00:50 christos 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/cdefs.h> 41__KERNEL_RCSID(0, "$NetBSD: compat_13_machdep.c,v 1.18 2007/03/04 06:00:50 christos Exp $"); 42 43#include "opt_ddb.h" 44 45#include <sys/param.h> 46#include <sys/systm.h> 47#include <sys/proc.h> 48#include <sys/user.h> 49#include <sys/kernel.h> 50#include <sys/mount.h> 51#include <sys/signal.h> 52#include <sys/signalvar.h> 53 54#include <sys/syscallargs.h> 55#include <sparc64/sparc64/sigdebug.h> 56 57#include <compat/sys/signal.h> 58#include <compat/sys/signalvar.h> 59/* 60 * System call to cleanup state after a signal 61 * has been taken. Reset signal mask and 62 * stack state from context left by sendsig (above), 63 * and return to the given trap frame (if there is one). 64 * Check carefully to make sure that the user has not 65 * modified the state to gain improper privileges or to cause 66 * a machine fault. 67 */ 68/* ARGSUSED */ 69int 70compat_13_sys_sigreturn(l, v, retval) 71 struct lwp *l; 72 void *v; 73 register_t *retval; 74{ 75 struct compat_13_sys_sigreturn_args /* { 76 syscallarg(struct sigcontext13 *) sigcntxp; 77 } */ *uap = v; 78 struct sigcontext13 sc, *scp; 79 struct trapframe64 *tf; 80 struct proc *p = l->l_proc; 81 sigset_t mask; 82 83 /* First ensure consistent stack state (see sendsig). */ 84 write_user_windows(); 85 if (rwindow_save(l)) { 86#ifdef DEBUG 87 printf("compat_13_sys_sigreturn: rwindow_save(%p) failed, sending SIGILL\n", l); 88#ifdef DDB 89 Debugger(); 90#endif 91#endif 92 mutex_enter(&p->p_smutex); 93 sigexit(l, SIGILL); 94 } 95#ifdef DEBUG 96 if (sigdebug & SDB_FOLLOW) { 97 printf("compat_13_sys_sigreturn: %s[%d], sigcntxp %p\n", 98 p->p_comm, p->p_pid, SCARG(uap, sigcntxp)); 99#ifdef DDB 100 if (sigdebug & SDB_DDB) Debugger(); 101#endif 102 } 103#endif 104 105 scp = SCARG(uap, sigcntxp); 106 if ((vaddr_t)scp & 3 || (copyin((void *)scp, &sc, sizeof sc) != 0)) 107#ifdef DEBUG 108 { 109 printf("compat_13_sys_sigreturn: copyin failed: scp=%p\n", scp); 110#ifdef DDB 111 Debugger(); 112#endif 113 return (EFAULT); 114 } 115#else 116 return (EFAULT); 117#endif 118 119 scp = ≻ 120 121 tf = l->l_md.md_tf; 122 /* 123 * Only the icc bits in the psr are used, so it need not be 124 * verified. pc and npc must be multiples of 4. This is all 125 * that is required; if it holds, just do it. 126 */ 127 if (((scp->sc_pc | scp->sc_npc) & 3) != 0 || scp->sc_pc == 0 || scp->sc_npc == 0) 128#ifdef DEBUG 129 { 130 printf("compat_13_sys_sigreturn: pc %p or npc %p invalid\n", 131 (void *)scp->sc_pc, (void *)scp->sc_npc); 132#ifdef DDB 133 Debugger(); 134#endif 135 return (EINVAL); 136 } 137#endif 138 return (EINVAL); 139 /* take only psr ICC field */ 140#ifdef __arch64__ 141 tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | scp->sc_tstate; 142#else 143 tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | PSRCC_TO_TSTATE(scp->sc_psr); 144#endif 145 tf->tf_pc = scp->sc_pc; 146 tf->tf_npc = scp->sc_npc; 147 tf->tf_global[1] = scp->sc_g1; 148 tf->tf_out[0] = scp->sc_o0; 149 tf->tf_out[6] = scp->sc_sp; 150#ifdef DEBUG 151 if (sigdebug & SDB_FOLLOW) { 152 printf("compat_13_sys_sigreturn: return trapframe pc=%llx sp=%llx tstate=%llx\n", 153 (long long)tf->tf_pc, (long long)tf->tf_out[6], 154 (long long)tf->tf_tstate); 155#ifdef DDB 156 if (sigdebug & SDB_DDB) Debugger(); 157#endif 158 } 159#endif 160 161 mutex_enter(&p->p_smutex); 162 if (scp->sc_onstack & SS_ONSTACK) 163 l->l_sigstk.ss_flags |= SS_ONSTACK; 164 else 165 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 166 167 /* Restore signal mask */ 168 native_sigset13_to_sigset(&scp->sc_mask, &mask); 169 (void) sigprocmask1(l, SIG_SETMASK, &mask, 0); 170 mutex_exit(&p->p_smutex); 171 172 return (EJUSTRETURN); 173} 174