compat_13_machdep.c revision 1.13
1/* $NetBSD: compat_13_machdep.c,v 1.13 2003/01/18 06:55:23 thorpej 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_ddb.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/sa.h> 52#include <sys/syscallargs.h> 53#include <sparc64/sparc64/sigdebug.h> 54 55/* 56 * System call to cleanup state after a signal 57 * has been taken. Reset signal mask and 58 * stack state from context left by sendsig (above), 59 * and return to the given trap frame (if there is one). 60 * Check carefully to make sure that the user has not 61 * modified the state to gain improper privileges or to cause 62 * a machine fault. 63 */ 64/* ARGSUSED */ 65int 66compat_13_sys_sigreturn(l, v, retval) 67 struct lwp *l; 68 void *v; 69 register_t *retval; 70{ 71 struct compat_13_sys_sigreturn_args /* { 72 syscallarg(struct sigcontext13 *) sigcntxp; 73 } */ *uap = v; 74 struct proc *p = l->l_proc; 75 struct sigcontext13 sc, *scp; 76 struct trapframe64 *tf; 77 sigset_t mask; 78 79 /* First ensure consistent stack state (see sendsig). */ 80 write_user_windows(); 81 if (rwindow_save(l)) { 82#ifdef DEBUG 83 printf("compat_13_sys_sigreturn: rwindow_save(%p) failed, sending SIGILL\n", l); 84#ifdef DDB 85 Debugger(); 86#endif 87#endif 88 sigexit(l, SIGILL); 89 } 90#ifdef DEBUG 91 if (sigdebug & SDB_FOLLOW) { 92 printf("compat_13_sys_sigreturn: %s[%d], sigcntxp %p\n", 93 p->p_comm, p->p_pid, SCARG(uap, sigcntxp)); 94#ifdef DDB 95 if (sigdebug & SDB_DDB) Debugger(); 96#endif 97 } 98#endif 99 100 scp = SCARG(uap, sigcntxp); 101 if ((vaddr_t)scp & 3 || (copyin((caddr_t)scp, &sc, sizeof sc) != 0)) 102#ifdef DEBUG 103 { 104 printf("compat_13_sys_sigreturn: copyin failed: scp=%p\n", scp); 105#ifdef DDB 106 Debugger(); 107#endif 108 return (EFAULT); 109 } 110#else 111 return (EFAULT); 112#endif 113 114 scp = ≻ 115 116 tf = l->l_md.md_tf; 117 /* 118 * Only the icc bits in the psr are used, so it need not be 119 * verified. pc and npc must be multiples of 4. This is all 120 * that is required; if it holds, just do it. 121 */ 122 if (((scp->sc_pc | scp->sc_npc) & 3) != 0 || scp->sc_pc == 0 || scp->sc_npc == 0) 123#ifdef DEBUG 124 { 125 printf("compat_13_sys_sigreturn: pc %p or npc %p invalid\n", 126 (void *)scp->sc_pc, (void *)scp->sc_npc); 127#ifdef DDB 128 Debugger(); 129#endif 130 return (EINVAL); 131 } 132#endif 133 return (EINVAL); 134 /* take only psr ICC field */ 135#ifdef __arch64__ 136 tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | scp->sc_tstate; 137#else 138 tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | PSRCC_TO_TSTATE(scp->sc_psr); 139#endif 140 tf->tf_pc = scp->sc_pc; 141 tf->tf_npc = scp->sc_npc; 142 tf->tf_global[1] = scp->sc_g1; 143 tf->tf_out[0] = scp->sc_o0; 144 tf->tf_out[6] = scp->sc_sp; 145#ifdef DEBUG 146 if (sigdebug & SDB_FOLLOW) { 147 printf("compat_13_sys_sigreturn: return trapframe pc=%llx sp=%llx tstate=%llx\n", 148 (long long)tf->tf_pc, (long long)tf->tf_out[6], 149 (long long)tf->tf_tstate); 150#ifdef DDB 151 if (sigdebug & SDB_DDB) Debugger(); 152#endif 153 } 154#endif 155 156 if (scp->sc_onstack & SS_ONSTACK) 157 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 158 else 159 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 160 161 /* Restore signal mask */ 162 native_sigset13_to_sigset(&scp->sc_mask, &mask); 163 (void) sigprocmask1(p, SIG_SETMASK, &mask, 0); 164 165 return (EJUSTRETURN); 166} 167