compat_13_machdep.c revision 1.14
1/* $NetBSD: compat_13_machdep.c,v 1.14 2003/07/15 03:36:08 lukem 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 1.14 2003/07/15 03:36:08 lukem 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/sa.h> 55#include <sys/syscallargs.h> 56#include <sparc64/sparc64/sigdebug.h> 57 58/* 59 * System call to cleanup state after a signal 60 * has been taken. Reset signal mask and 61 * stack state from context left by sendsig (above), 62 * and return to the given trap frame (if there is one). 63 * Check carefully to make sure that the user has not 64 * modified the state to gain improper privileges or to cause 65 * a machine fault. 66 */ 67/* ARGSUSED */ 68int 69compat_13_sys_sigreturn(l, v, retval) 70 struct lwp *l; 71 void *v; 72 register_t *retval; 73{ 74 struct compat_13_sys_sigreturn_args /* { 75 syscallarg(struct sigcontext13 *) sigcntxp; 76 } */ *uap = v; 77 struct proc *p = l->l_proc; 78 struct sigcontext13 sc, *scp; 79 struct trapframe64 *tf; 80 sigset_t mask; 81 82 /* First ensure consistent stack state (see sendsig). */ 83 write_user_windows(); 84 if (rwindow_save(l)) { 85#ifdef DEBUG 86 printf("compat_13_sys_sigreturn: rwindow_save(%p) failed, sending SIGILL\n", l); 87#ifdef DDB 88 Debugger(); 89#endif 90#endif 91 sigexit(l, SIGILL); 92 } 93#ifdef DEBUG 94 if (sigdebug & SDB_FOLLOW) { 95 printf("compat_13_sys_sigreturn: %s[%d], sigcntxp %p\n", 96 p->p_comm, p->p_pid, SCARG(uap, sigcntxp)); 97#ifdef DDB 98 if (sigdebug & SDB_DDB) Debugger(); 99#endif 100 } 101#endif 102 103 scp = SCARG(uap, sigcntxp); 104 if ((vaddr_t)scp & 3 || (copyin((caddr_t)scp, &sc, sizeof sc) != 0)) 105#ifdef DEBUG 106 { 107 printf("compat_13_sys_sigreturn: copyin failed: scp=%p\n", scp); 108#ifdef DDB 109 Debugger(); 110#endif 111 return (EFAULT); 112 } 113#else 114 return (EFAULT); 115#endif 116 117 scp = ≻ 118 119 tf = l->l_md.md_tf; 120 /* 121 * Only the icc bits in the psr are used, so it need not be 122 * verified. pc and npc must be multiples of 4. This is all 123 * that is required; if it holds, just do it. 124 */ 125 if (((scp->sc_pc | scp->sc_npc) & 3) != 0 || scp->sc_pc == 0 || scp->sc_npc == 0) 126#ifdef DEBUG 127 { 128 printf("compat_13_sys_sigreturn: pc %p or npc %p invalid\n", 129 (void *)scp->sc_pc, (void *)scp->sc_npc); 130#ifdef DDB 131 Debugger(); 132#endif 133 return (EINVAL); 134 } 135#endif 136 return (EINVAL); 137 /* take only psr ICC field */ 138#ifdef __arch64__ 139 tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | scp->sc_tstate; 140#else 141 tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | PSRCC_TO_TSTATE(scp->sc_psr); 142#endif 143 tf->tf_pc = scp->sc_pc; 144 tf->tf_npc = scp->sc_npc; 145 tf->tf_global[1] = scp->sc_g1; 146 tf->tf_out[0] = scp->sc_o0; 147 tf->tf_out[6] = scp->sc_sp; 148#ifdef DEBUG 149 if (sigdebug & SDB_FOLLOW) { 150 printf("compat_13_sys_sigreturn: return trapframe pc=%llx sp=%llx tstate=%llx\n", 151 (long long)tf->tf_pc, (long long)tf->tf_out[6], 152 (long long)tf->tf_tstate); 153#ifdef DDB 154 if (sigdebug & SDB_DDB) Debugger(); 155#endif 156 } 157#endif 158 159 if (scp->sc_onstack & SS_ONSTACK) 160 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 161 else 162 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 163 164 /* Restore signal mask */ 165 native_sigset13_to_sigset(&scp->sc_mask, &mask); 166 (void) sigprocmask1(p, SIG_SETMASK, &mask, 0); 167 168 return (EJUSTRETURN); 169} 170