/* $NetBSD: compat_16_machdep.c,v 1.22 2017/03/16 16:13:20 chs Exp $ */ /*- * Copyright (c) 1998, 2001 The NetBSD Foundation, Inc. * All rights reserved. * * This code is derived from software contributed to The NetBSD Foundation * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility, * NASA Ames Research Center and by Chris Demetriou. * * 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 1996 The Board of Trustees of The Leland Stanford * Junior University. All Rights Reserved. * * Permission to use, copy, modify, and distribute this * software and its documentation for any purpose and without * fee is hereby granted, provided that the above copyright * notice appear in all copies. Stanford University * makes no representations about the suitability of this * software for any purpose. It is provided "as is" without * express or implied warranty. */ #include /* RCS ID & Copyright macro defns */ __KERNEL_RCSID(0, "$NetBSD: compat_16_machdep.c,v 1.22 2017/03/16 16:13:20 chs Exp $"); #ifdef _KERNEL_OPT #include "opt_cputype.h" #include "opt_compat_netbsd.h" #include "opt_compat_ultrix.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if !defined(__mips_o32) #define fpreg fpreg_oabi #endif #ifdef DEBUG int sigdebug = 0; int sigpid = 0; #define SDB_FOLLOW 0x01 #define SDB_KSTACK 0x02 #define SDB_FPSTATE 0x04 #endif /* * Send a signal to process. */ void sendsig_sigcontext(const ksiginfo_t *ksi, const sigset_t *returnmask) { int sig = ksi->ksi_signo; struct lwp * const l = curlwp; struct proc * const p = l->l_proc; struct sigacts * const ps = p->p_sigacts; struct pcb * const pcb = lwp_getpcb(l); int onstack, error; struct sigcontext *scp = getframe(l, sig, &onstack); struct sigcontext ksc; struct trapframe * const tf = l->l_md.md_utf; sig_t catcher = SIGACTION(p, sig).sa_handler; #if !defined(__mips_o32) if (p->p_md.md_abi != _MIPS_BSD_API_O32) sigexit(l, SIGILL); #endif scp--; #ifdef DEBUG if ((sigdebug & SDB_FOLLOW) || ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)) printf("sendsig(%d): sig %d ssp %p scp %p\n", p->p_pid, sig, &onstack, scp); #endif /* Build stack frame for signal trampoline. */ ksc.sc_pc = tf->tf_regs[_R_PC]; ksc.mullo = tf->tf_regs[_R_MULLO]; ksc.mulhi = tf->tf_regs[_R_MULHI]; /* Save register context. */ ksc.sc_regs[_R_ZERO] = 0xACEDBADE; /* magic number */ #if defined(__mips_o32) memcpy(&ksc.sc_regs[1], &tf->tf_regs[1], sizeof(ksc.sc_regs) - sizeof(ksc.sc_regs[0])); #else for (size_t i = 1; i < 32; i++) ksc.sc_regs[i] = tf->tf_regs[i]; #endif /* Save the FP state, if necessary, then copy it. */ ksc.sc_fpused = fpu_used_p(l); #if !defined(NOFPU) if (ksc.sc_fpused) { /* if FPU has current state, save it first */ fpu_save(l); } #endif *(struct fpreg *)ksc.sc_fpregs = *(struct fpreg *)&pcb->pcb_fpregs; /* Save signal stack. */ ksc.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK; /* Save signal mask. */ ksc.sc_mask = *returnmask; #if defined(COMPAT_13) || defined(COMPAT_ULTRIX) /* * XXX We always have to save an old style signal mask because * XXX we might be delivering a signal to a process which will * XXX escape from the signal in a non-standard way and invoke * XXX sigreturn() directly. */ native_sigset_to_sigset13(returnmask, &ksc.__sc_mask13); #endif sendsig_reset(l, sig); mutex_exit(p->p_lock); error = copyout(&ksc, (void *)scp, sizeof(ksc)); mutex_enter(p->p_lock); if (error != 0) { /* * Process has trashed its stack; give it an illegal * instruction to halt it in its tracks. */ #ifdef DEBUG if ((sigdebug & SDB_FOLLOW) || ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)) printf("sendsig(%d): copyout failed on sig %d\n", p->p_pid, sig); #endif sigexit(l, SIGILL); /* NOTREACHED */ } /* * Set up the registers to directly invoke the signal * handler. The return address will be set up to point * to the signal trampoline to bounce us back. */ tf->tf_regs[_R_A0] = sig; tf->tf_regs[_R_A1] = ksi->ksi_trap; tf->tf_regs[_R_A2] = (intptr_t)scp; tf->tf_regs[_R_A3] = (intptr_t)catcher; /* XXX ??? */ tf->tf_regs[_R_PC] = (intptr_t)catcher; tf->tf_regs[_R_T9] = (intptr_t)catcher; tf->tf_regs[_R_SP] = (intptr_t)scp; switch (ps->sa_sigdesc[sig].sd_vers) { case 0: /* legacy on-stack sigtramp */ tf->tf_regs[_R_RA] = (intptr_t)p->p_sigctx.ps_sigcode; break; #ifdef COMPAT_16 case 1: tf->tf_regs[_R_RA] = (intptr_t)ps->sa_sigdesc[sig].sd_tramp; break; #endif default: /* Don't know what trampoline version; kill it. */ sigexit(l, SIGILL); } /* Remember that we're now on the signal stack. */ if (onstack) l->l_sigstk.ss_flags |= SS_ONSTACK; #ifdef DEBUG if ((sigdebug & SDB_FOLLOW) || ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid)) printf("sendsig(%d): sig %d returns\n", p->p_pid, sig); #endif } #ifdef COMPAT_16 /* not needed if COMPAT_ULTRIX only */ /* * 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. */ /* ARGSUSED */ 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, ksc; struct trapframe * const tf = l->l_md.md_utf; struct proc * const p = l->l_proc; struct pcb * const pcb = lwp_getpcb(l); int error; #if !defined(__mips_o32) if (p->p_md.md_abi != _MIPS_BSD_API_O32) return ENOSYS; #endif /* * 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); #ifdef DEBUG if (sigdebug & SDB_FOLLOW) printf("sigreturn: pid %d, scp %p\n", l->l_proc->p_pid, scp); #endif if ((error = copyin(scp, &ksc, sizeof(ksc))) != 0) return (error); if ((u_int) ksc.sc_regs[_R_ZERO] != 0xacedbadeU)/* magic number */ return (EINVAL); /* Restore the register context. */ tf->tf_regs[_R_PC] = ksc.sc_pc; tf->tf_regs[_R_MULLO] = ksc.mullo; tf->tf_regs[_R_MULHI] = ksc.mulhi; #if defined(__mips_o32) memcpy(&tf->tf_regs[1], &scp->sc_regs[1], sizeof(scp->sc_regs) - sizeof(scp->sc_regs[0])); #else for (size_t i = 1; i < __arraycount(ksc.sc_regs); i++) tf->tf_regs[i] = ksc.sc_regs[i]; #endif #if !defined(NOFPU) if (scp->sc_fpused) { fpu_discard(l); } #endif *(struct fpreg *)&pcb->pcb_fpregs = *(struct fpreg *)scp->sc_fpregs; mutex_enter(p->p_lock); /* Restore signal stack. */ if (ksc.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, &ksc.sc_mask, 0); mutex_exit(p->p_lock); return (EJUSTRETURN); } #endif /* COMPAT_16 */