/* $NetBSD: compat_16_machdep.c,v 1.2 2021/10/27 04:15:00 thorpej Exp $ */ /*- * Copyright (c) 1996, 1997, 1998, 2002 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Charles M. Hannum and by Jason R. Thorpe of the Numerical Aerospace * Simulation Facility, NASA Ames Research Center. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE * POSSIBILITY OF SUCH DAMAGE. */ /*- * Copyright (c) 1982, 1987, 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * William Jolitz. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * @(#)machdep.c 7.4 (Berkeley) 6/3/91 */ #include <sys/cdefs.h> __KERNEL_RCSID(0, "$NetBSD: compat_16_machdep.c,v 1.2 2021/10/27 04:15:00 thorpej Exp $"); #ifdef _KERNEL_OPT #include "opt_compat_netbsd.h" #endif #include <sys/param.h> #include <sys/systm.h> #include <sys/proc.h> #include <sys/signal.h> #include <sys/signalvar.h> #include <sys/syscallargs.h> #include <compat/sys/signal.h> #include <compat/sys/signalvar.h> #ifdef COMPAT_16 /* * Stack is set up to allow sigcode stored * in u. to call routine, followed by kcall * to sigreturn routine below. After sigreturn * resets the signal mask, the stack, and the * frame pointer, it returns to the user * specified pc, psl. */ void sendsig_sigcontext(const ksiginfo_t *ksi, const sigset_t *mask) { struct lwp *l = curlwp; struct proc *p = l->l_proc; struct sigacts *ps = p->p_sigacts; struct trapframe *tf = l->l_md.md_regs; int sig = ksi->ksi_info._signo; sig_t catcher = SIGACTION(p, sig).sa_handler; struct sigframe_sigcontext *fp, frame; int onstack, error; fp = getframe(l, sig, &onstack); --fp; /* Save register context. */ frame.sf_sc.sc_ssr = tf->tf_ssr; frame.sf_sc.sc_spc = tf->tf_spc; frame.sf_sc.sc_pr = tf->tf_pr; frame.sf_sc.sc_r15 = tf->tf_r15; frame.sf_sc.sc_r14 = tf->tf_r14; frame.sf_sc.sc_r13 = tf->tf_r13; frame.sf_sc.sc_r12 = tf->tf_r12; frame.sf_sc.sc_r11 = tf->tf_r11; frame.sf_sc.sc_r10 = tf->tf_r10; frame.sf_sc.sc_r9 = tf->tf_r9; frame.sf_sc.sc_r8 = tf->tf_r8; frame.sf_sc.sc_r7 = tf->tf_r7; frame.sf_sc.sc_r6 = tf->tf_r6; frame.sf_sc.sc_r5 = tf->tf_r5; frame.sf_sc.sc_r4 = tf->tf_r4; frame.sf_sc.sc_r3 = tf->tf_r3; frame.sf_sc.sc_r2 = tf->tf_r2; frame.sf_sc.sc_r1 = tf->tf_r1; frame.sf_sc.sc_r0 = tf->tf_r0; frame.sf_sc.sc_expevt = tf->tf_expevt; /* Save signal stack. */ frame.sf_sc.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK; /* Save signal mask. */ frame.sf_sc.sc_mask = *mask; sendsig_reset(l, sig); mutex_exit(p->p_lock); error = copyout(&frame, fp, sizeof(frame)); mutex_enter(p->p_lock); if (error != 0) { /* * Process has trashed its stack; give it an illegal * instruction to halt it in its tracks. */ sigexit(l, SIGILL); /* NOTREACHED */ } /* * Build context to run handler in. We invoke the handler * directly, only returning via the trampoline. */ switch (ps->sa_sigdesc[sig].sd_vers) { case __SIGTRAMP_SIGCODE_VERSION: /* legacy on-stack sigtramp */ tf->tf_pr = (int)p->p_sigctx.ps_sigcode; break; case __SIGTRAMP_SIGCONTEXT_VERSION: tf->tf_pr = (int)ps->sa_sigdesc[sig].sd_tramp; break; default: /* Don't know what trampoline version; kill it. */ printf("sendsig_sigcontext: bad version %d\n", ps->sa_sigdesc[sig].sd_vers); sigexit(l, SIGILL); } tf->tf_r4 = sig; tf->tf_r5 = ksi->ksi_code; tf->tf_r6 = (int)&fp->sf_sc; tf->tf_spc = (int)catcher; tf->tf_r15 = (int)fp; /* Remember if we're now on the signal stack. */ if (onstack) l->l_sigstk.ss_flags |= SS_ONSTACK; } /* * System call to cleanup state after a signal * has been taken. Reset signal mask and * stack state from context left by sendsig (above). * Return to previous pc and psl as specified by * context left by sendsig. Check carefully to * make sure that the user has not modified the * psl to gain improper privileges or to cause * a machine fault. */ int compat_16_sys___sigreturn14(struct lwp *l, const struct compat_16_sys___sigreturn14_args *uap, register_t *retval) { /* { syscallarg(struct sigcontext *) sigcntxp; } */ struct sigcontext *scp, context; struct trapframe *tf; struct proc *p = l->l_proc; /* * The trampoline code hands us the context. * It is unsafe to keep track of it ourselves, in the event that a * program jumps out of a signal handler. */ scp = SCARG(uap, sigcntxp); if (copyin((void *)scp, &context, sizeof(*scp)) != 0) return (EFAULT); /* Restore signal context. */ tf = l->l_md.md_regs; /* Check for security violations. */ if (((context.sc_ssr ^ tf->tf_ssr) & PSL_USERSTATIC) != 0) return (EINVAL); tf->tf_ssr = context.sc_ssr; tf->tf_r0 = context.sc_r0; tf->tf_r1 = context.sc_r1; tf->tf_r2 = context.sc_r2; tf->tf_r3 = context.sc_r3; tf->tf_r4 = context.sc_r4; tf->tf_r5 = context.sc_r5; tf->tf_r6 = context.sc_r6; tf->tf_r7 = context.sc_r7; tf->tf_r8 = context.sc_r8; tf->tf_r9 = context.sc_r9; tf->tf_r10 = context.sc_r10; tf->tf_r11 = context.sc_r11; tf->tf_r12 = context.sc_r12; tf->tf_r13 = context.sc_r13; tf->tf_r14 = context.sc_r14; tf->tf_spc = context.sc_spc; tf->tf_r15 = context.sc_r15; tf->tf_pr = context.sc_pr; mutex_enter(p->p_lock); /* Restore signal stack. */ if (context.sc_onstack & SS_ONSTACK) l->l_sigstk.ss_flags |= SS_ONSTACK; else l->l_sigstk.ss_flags &= ~SS_ONSTACK; /* Restore signal mask. */ (void) sigprocmask1(l, SIG_SETMASK, &context.sc_mask, 0); mutex_exit(p->p_lock); return (EJUSTRETURN); } #endif /* COMPAT_16 */
