compat_13_machdep.c revision 1.24
1/* $NetBSD: compat_13_machdep.c,v 1.24 2017/08/22 09:12:49 maxv 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 * 20 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 21 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 22 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 23 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 24 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 25 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 26 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 27 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 29 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 30 * POSSIBILITY OF SUCH DAMAGE. 31 */ 32 33#include <sys/cdefs.h> 34__KERNEL_RCSID(0, "$NetBSD: compat_13_machdep.c,v 1.24 2017/08/22 09:12:49 maxv Exp $"); 35 36#ifdef _KERNEL_OPT 37#include "opt_ddb.h" 38#endif 39 40#include <sys/param.h> 41#include <sys/systm.h> 42#include <sys/proc.h> 43#include <sys/kernel.h> 44#include <sys/mount.h> 45#include <sys/signal.h> 46#include <sys/signalvar.h> 47 48#include <sys/syscallargs.h> 49#include <sparc64/sparc64/sigdebug.h> 50 51#include <compat/sys/signal.h> 52#include <compat/sys/signalvar.h> 53/* 54 * System call to cleanup state after a signal 55 * has been taken. Reset signal mask and 56 * stack state from context left by sendsig (above), 57 * and return to the given trap frame (if there is one). 58 * Check carefully to make sure that the user has not 59 * modified the state to gain improper privileges or to cause 60 * a machine fault. 61 */ 62/* ARGSUSED */ 63int 64compat_13_sys_sigreturn(struct lwp *l, const struct compat_13_sys_sigreturn_args *uap, register_t *retval) 65{ 66 /* { 67 syscallarg(struct sigcontext13 *) sigcntxp; 68 } */ 69 struct sigcontext13 sc, *scp; 70 struct trapframe64 *tf; 71 struct proc *p = l->l_proc; 72 sigset_t mask; 73 74 /* First ensure consistent stack state (see sendsig). */ 75 write_user_windows(); 76 if (rwindow_save(l)) { 77#ifdef DEBUG 78 printf("compat_13_sys_sigreturn: rwindow_save(%p) failed, sending SIGILL\n", l); 79#ifdef DDB 80 Debugger(); 81#endif 82#endif 83 mutex_enter(p->p_lock); 84 sigexit(l, SIGILL); 85 } 86#ifdef DEBUG 87 if (sigdebug & SDB_FOLLOW) { 88 printf("compat_13_sys_sigreturn: %s[%d], sigcntxp %p\n", 89 p->p_comm, p->p_pid, SCARG(uap, sigcntxp)); 90#ifdef DDB 91 if (sigdebug & SDB_DDB) Debugger(); 92#endif 93 } 94#endif 95 96 scp = SCARG(uap, sigcntxp); 97 if ((vaddr_t)scp & 3 || (copyin((void *)scp, &sc, sizeof sc) != 0)) 98#ifdef DEBUG 99 { 100 printf("compat_13_sys_sigreturn: copyin failed: scp=%p\n", scp); 101#ifdef DDB 102 Debugger(); 103#endif 104 return (EFAULT); 105 } 106#else 107 return (EFAULT); 108#endif 109 110 scp = ≻ 111 112 tf = l->l_md.md_tf; 113 /* 114 * Only the icc bits in the psr are used, so it need not be 115 * verified. pc and npc must be multiples of 4. This is all 116 * that is required; if it holds, just do it. 117 */ 118 if (((scp->sc_pc | scp->sc_npc) & 3) != 0 || scp->sc_pc == 0 || scp->sc_npc == 0) 119#ifdef DEBUG 120 { 121 printf("compat_13_sys_sigreturn: pc %p or npc %p invalid\n", 122 (void *)scp->sc_pc, (void *)scp->sc_npc); 123#ifdef DDB 124 Debugger(); 125#endif 126 return (EINVAL); 127 } 128#endif 129 return (EINVAL); 130 /* take only psr ICC field */ 131#ifdef __arch64__ 132 tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | (scp->sc_tstate & TSTATE_CCR); 133#else 134 tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | PSRCC_TO_TSTATE(scp->sc_psr); 135#endif 136 tf->tf_pc = scp->sc_pc; 137 tf->tf_npc = scp->sc_npc; 138 tf->tf_global[1] = scp->sc_g1; 139 tf->tf_out[0] = scp->sc_o0; 140 tf->tf_out[6] = scp->sc_sp; 141#ifdef DEBUG 142 if (sigdebug & SDB_FOLLOW) { 143 printf("compat_13_sys_sigreturn: return trapframe pc=%llx sp=%llx tstate=%llx\n", 144 (long long)tf->tf_pc, (long long)tf->tf_out[6], 145 (long long)tf->tf_tstate); 146#ifdef DDB 147 if (sigdebug & SDB_DDB) Debugger(); 148#endif 149 } 150#endif 151 152 mutex_enter(p->p_lock); 153 if (scp->sc_onstack & SS_ONSTACK) 154 l->l_sigstk.ss_flags |= SS_ONSTACK; 155 else 156 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 157 158 /* Restore signal mask */ 159 native_sigset13_to_sigset(&scp->sc_mask, &mask); 160 (void) sigprocmask1(l, SIG_SETMASK, &mask, 0); 161 mutex_exit(p->p_lock); 162 163 return (EJUSTRETURN); 164} 165