compat_13_machdep.c revision 1.11
1/* $NetBSD: compat_13_machdep.c,v 1.11 2000/12/22 22:58:56 jdolecek 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/syscallargs.h> 52#include <sparc64/sparc64/sigdebug.h> 53 54/* 55 * System call to cleanup state after a signal 56 * has been taken. Reset signal mask and 57 * stack state from context left by sendsig (above), 58 * and return to the given trap frame (if there is one). 59 * Check carefully to make sure that the user has not 60 * modified the state to gain improper privileges or to cause 61 * a machine fault. 62 */ 63/* ARGSUSED */ 64int 65compat_13_sys_sigreturn(p, v, retval) 66 struct proc *p; 67 void *v; 68 register_t *retval; 69{ 70 struct compat_13_sys_sigreturn_args /* { 71 syscallarg(struct sigcontext13 *) sigcntxp; 72 } */ *uap = v; 73 struct sigcontext13 sc, *scp; 74 sigset_t mask; 75 struct trapframe64 *tf; 76 77 /* First ensure consistent stack state (see sendsig). */ 78 write_user_windows(); 79 if (rwindow_save(p)) { 80#ifdef DEBUG 81 printf("compat_13_sys_sigreturn: rwindow_save(%p) failed, sending SIGILL\n", p); 82#ifdef DDB 83 Debugger(); 84#endif 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#ifdef DDB 93 if (sigdebug & SDB_DDB) Debugger(); 94#endif 95 } 96#endif 97 98 scp = SCARG(uap, sigcntxp); 99 if ((vaddr_t)scp & 3 || (copyin((caddr_t)scp, &sc, sizeof sc) != 0)) 100#ifdef DEBUG 101 { 102 printf("compat_13_sys_sigreturn: copyin failed: scp=%p\n", scp); 103#ifdef DDB 104 Debugger(); 105#endif 106 return (EFAULT); 107 } 108#else 109 return (EFAULT); 110#endif 111 112 scp = ≻ 113 114 tf = p->p_md.md_tf; 115 /* 116 * Only the icc bits in the psr are used, so it need not be 117 * verified. pc and npc must be multiples of 4. This is all 118 * that is required; if it holds, just do it. 119 */ 120 if (((scp->sc_pc | scp->sc_npc) & 3) != 0 || scp->sc_pc == 0 || scp->sc_npc == 0) 121#ifdef DEBUG 122 { 123 printf("compat_13_sys_sigreturn: pc %qx or npc %qx invalid\n", 124 (u_int64_t)scp->sc_pc, (u_int64_t)scp->sc_npc); 125#ifdef DDB 126 Debugger(); 127#endif 128 return (EINVAL); 129 } 130#endif 131 return (EINVAL); 132 /* take only psr ICC field */ 133#ifdef __arch64__ 134 tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | scp->sc_tstate; 135#else 136 tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | PSRCC_TO_TSTATE(scp->sc_psr); 137#endif 138 tf->tf_pc = scp->sc_pc; 139 tf->tf_npc = scp->sc_npc; 140 tf->tf_global[1] = scp->sc_g1; 141 tf->tf_out[0] = scp->sc_o0; 142 tf->tf_out[6] = scp->sc_sp; 143#ifdef DEBUG 144 if (sigdebug & SDB_FOLLOW) { 145 printf("compat_13_sys_sigreturn: return trapframe pc=%qx sp=%qx tstate=%qx\n", 146 (u_int64_t)tf->tf_pc, (u_int64_t)tf->tf_out[6], 147 (u_int64_t)tf->tf_tstate); 148#ifdef DDB 149 if (sigdebug & SDB_DDB) Debugger(); 150#endif 151 } 152#endif 153 154 if (scp->sc_onstack & SS_ONSTACK) 155 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 156 else 157 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 158 159 /* Restore signal mask */ 160 native_sigset13_to_sigset(&scp->sc_mask, &mask); 161 (void) sigprocmask1(p, SIG_SETMASK, &mask, 0); 162 163 return (EJUSTRETURN); 164} 165