1 /* $NetBSD: compat_13_machdep.c,v 1.14 2009/11/23 00:11:44 rmind Exp $ */ 2 3 /* 4 * Copyright (c) 1982, 1986, 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * the Systems Programming Group of the University of Utah Computer 9 * Science Department. 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. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 * 35 * from: Utah Hdr: machdep.c 1.74 92/12/20 36 * from: @(#)machdep.c 8.10 (Berkeley) 4/20/94 37 */ 38 /* 39 * Copyright (c) 1988 University of Utah. 40 * 41 * This code is derived from software contributed to Berkeley by 42 * the Systems Programming Group of the University of Utah Computer 43 * Science Department. 44 * 45 * Redistribution and use in source and binary forms, with or without 46 * modification, are permitted provided that the following conditions 47 * are met: 48 * 1. Redistributions of source code must retain the above copyright 49 * notice, this list of conditions and the following disclaimer. 50 * 2. Redistributions in binary form must reproduce the above copyright 51 * notice, this list of conditions and the following disclaimer in the 52 * documentation and/or other materials provided with the distribution. 53 * 3. All advertising materials mentioning features or use of this software 54 * must display the following acknowledgement: 55 * This product includes software developed by the University of 56 * California, Berkeley and its contributors. 57 * 4. Neither the name of the University nor the names of its contributors 58 * may be used to endorse or promote products derived from this software 59 * without specific prior written permission. 60 * 61 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 62 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 63 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 64 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 65 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 66 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 67 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 68 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 69 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 70 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 71 * SUCH DAMAGE. 72 * 73 * from: Utah Hdr: machdep.c 1.74 92/12/20 74 * from: @(#)machdep.c 8.10 (Berkeley) 4/20/94 75 */ 76 77 #include <sys/cdefs.h> 78 __KERNEL_RCSID(0, "$NetBSD: compat_13_machdep.c,v 1.14 2009/11/23 00:11:44 rmind Exp $"); 79 80 #include <sys/param.h> 81 #include <sys/systm.h> 82 #include <sys/kernel.h> 83 #include <sys/proc.h> 84 #include <sys/signal.h> 85 #include <sys/signalvar.h> 86 87 #include <sys/mount.h> 88 #include <sys/syscallargs.h> 89 90 #include <compat/sys/signal.h> 91 #include <compat/sys/signalvar.h> 92 93 #include <machine/cpu.h> 94 #include <machine/reg.h> 95 96 /* 97 * System call to cleanup state after a signal 98 * has been taken. Reset signal mask and 99 * stack state from context left by sendsig (above). 100 * Return to previous pc and psl as specified by 101 * context left by sendsig. Check carefully to 102 * make sure that the user has not modified the 103 * psl to gain improper privileges or to cause 104 * a machine fault. 105 */ 106 int 107 compat_13_sys_sigreturn(struct lwp *l, const struct compat_13_sys_sigreturn_args *uap, register_t *retval) 108 { 109 /* { 110 syscallarg(struct sigcontext13 *) sigcntxp; 111 } */ 112 struct proc *p = l->l_proc; 113 struct sigcontext13 *scp; 114 struct frame *frame; 115 struct sigcontext13 tsigc; 116 sigset_t mask; 117 118 /* 119 * The trampoline code hands us the context. 120 * It is unsafe to keep track of it ourselves, in the event that a 121 * program jumps out of a signal handler. 122 */ 123 scp = SCARG(uap, sigcntxp); 124 if ((int)scp & 1) 125 return EINVAL; 126 127 if (copyin(scp, &tsigc, sizeof(tsigc)) != 0) 128 return EFAULT; 129 scp = &tsigc; 130 131 /* Make sure the user isn't pulling a fast one on us! */ 132 if ((scp->sc_ps & (PSL_MBZ|PSL_IPL|PSL_S)) != 0) 133 return EINVAL; 134 135 /* Restore register context. */ 136 frame = (struct frame *)l->l_md.md_regs; 137 138 /* 139 * We only support restoring the sigcontext13 in this call. 140 * We are not called from the sigcode (per sendsig()), so 141 * we will not have a sigstate to restore. 142 */ 143 if (scp->sc_ap != 0) 144 return EINVAL; 145 146 /* 147 * Restore the user supplied information. 148 * This should be at the last so that the error (EINVAL) 149 * is reported to the sigreturn caller, not to the 150 * jump destination. 151 */ 152 153 frame->f_regs[SP] = scp->sc_sp; 154 frame->f_regs[A6] = scp->sc_fp; 155 frame->f_pc = scp->sc_pc; 156 frame->f_sr = scp->sc_ps; 157 158 mutex_enter(p->p_lock); 159 160 /* Restore signal stack. */ 161 if (scp->sc_onstack & SS_ONSTACK) 162 l->l_sigstk.ss_flags |= SS_ONSTACK; 163 else 164 l->l_sigstk.ss_flags &= ~SS_ONSTACK; 165 166 /* Restore signal mask. */ 167 native_sigset13_to_sigset(&scp->sc_mask, &mask); 168 (void)sigprocmask1(l, SIG_SETMASK, &mask, 0); 169 170 mutex_exit(p->p_lock); 171 172 return EJUSTRETURN; 173 } 174