1 /* $NetBSD: compat_13_machdep.c,v 1.3 2000/12/22 22:58:54 jdolecek Exp $ */ 2 3 /* 4 * Copyright (c) 1988 University of Utah. 5 * Copyright (c) 1982, 1986, 1990, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * the Systems Programming Group of the University of Utah Computer 10 * Science Department. 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * from: Utah Hdr: machdep.c 1.74 92/12/20 41 * from: @(#)machdep.c 8.10 (Berkeley) 4/20/94 42 */ 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/proc.h> 48 #include <sys/user.h> 49 #include <sys/signal.h> 50 #include <sys/signalvar.h> 51 52 #include <sys/mount.h> 53 #include <sys/syscallargs.h> 54 55 #include <machine/cpu.h> 56 #include <machine/reg.h> 57 58 extern int fputype; 59 extern short exframesize[]; 60 void m68881_restore __P((struct fpframe *)); 61 62 /* 63 * System call to cleanup state after a signal 64 * has been taken. Reset signal mask and 65 * stack state from context left by sendsig (above). 66 * Return to previous pc and psl as specified by 67 * context left by sendsig. Check carefully to 68 * make sure that the user has not modified the 69 * psl to gain improper privileges or to cause 70 * a machine fault. 71 */ 72 int 73 compat_13_sys_sigreturn(p, v, retval) 74 struct proc *p; 75 void *v; 76 register_t *retval; 77 { 78 struct compat_13_sys_sigreturn_args /* { 79 syscallarg(struct sigcontext13 *) sigcntxp; 80 } */ *uap = v; 81 struct sigcontext13 *scp; 82 struct frame *frame; 83 struct sigcontext13 tsigc; 84 sigset_t mask; 85 86 /* 87 * The trampoline code hands us the context. 88 * It is unsafe to keep track of it ourselves, in the event that a 89 * program jumps out of a signal handler. 90 */ 91 scp = SCARG(uap, sigcntxp); 92 if ((int)scp & 1) 93 return (EINVAL); 94 95 if (copyin(scp, &tsigc, sizeof(tsigc)) != 0) 96 return (EFAULT); 97 scp = &tsigc; 98 99 /* Make sure the user isn't pulling a fast one on us! */ 100 if ((scp->sc_ps & (PSL_MBZ|PSL_IPL|PSL_S)) != 0) 101 return (EINVAL); 102 103 /* Restore register context. */ 104 frame = (struct frame *) p->p_md.md_regs; 105 106 /* 107 * We only support restoring the sigcontext13 in this call. 108 * We are not called from the sigcode (per sendsig()), so 109 * we will not have a sigstate to restore. 110 */ 111 if (scp->sc_ap != 0) 112 return (EINVAL); 113 114 /* 115 * Restore the user supplied information. 116 * This should be at the last so that the error (EINVAL) 117 * is reported to the sigreturn caller, not to the 118 * jump destination. 119 */ 120 121 frame->f_regs[SP] = scp->sc_sp; 122 frame->f_regs[A6] = scp->sc_fp; 123 frame->f_pc = scp->sc_pc; 124 frame->f_sr = scp->sc_ps; 125 126 /* Restore signal stack. */ 127 if (scp->sc_onstack & SS_ONSTACK) 128 p->p_sigctx.ps_sigstk.ss_flags |= SS_ONSTACK; 129 else 130 p->p_sigctx.ps_sigstk.ss_flags &= ~SS_ONSTACK; 131 132 /* Restore signal mask. */ 133 native_sigset13_to_sigset(&scp->sc_mask, &mask); 134 (void) sigprocmask1(p, SIG_SETMASK, &mask, 0); 135 136 return (EJUSTRETURN); 137 } 138