/* $NetBSD: compat_16_machdep.c,v 1.18 2021/10/27 04:15:00 thorpej Exp $ */ /*- * Copyright (c) 1996, 1997, 1998 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. * * 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. */ #include __KERNEL_RCSID(0, "$NetBSD: compat_16_machdep.c,v 1.18 2021/10/27 04:15:00 thorpej Exp $"); #ifdef _KERNEL_OPT #include "opt_compat_netbsd.h" #endif #include #include #include #include #include #include #include #include #include #include #if defined(COMPAT_16) #include #include #ifdef DEBUG /* See sigdebug.h */ #include #endif #ifdef __arch64__ #define STACK_OFFSET BIAS #define CPOUTREG(l,v) copyout(&(v), (l), sizeof(v)) #undef CCFSZ #define CCFSZ CC64FSZ #else #define STACK_OFFSET 0 #define CPOUTREG(l,v) copyout(&(v), (l), sizeof(v)) #endif struct sigframe_sigcontext { int sf_signo; /* signal number */ int sf_code; /* code */ #ifndef __arch64__ struct sigcontext *sf_scp; /* SunOS user addr of sigcontext */ int sf_addr; /* SunOS compat, always 0 for now */ #endif struct sigcontext sf_sc; /* actual sigcontext */ }; /* * Send an interrupt to process. */ 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; const void *addr; struct rwindow *newsp; #ifdef NOT_DEBUG struct rwindow tmpwin; #endif int onstack, error; int sig = ksi->ksi_signo; struct sigframe_sigcontext *fp = getframe(l, sig, &onstack); struct sigframe_sigcontext sf; sig_t catcher = SIGACTION(p, sig).sa_handler; struct trapframe64 *tf = l->l_md.md_tf; /* Allocate an aligned sigframe */ fp = (void *)((u_long)(fp - 1) & ~0x0f); #ifdef DEBUG sigpid = p->p_pid; if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) { printf("sendsig_sigcontext: %s[%d] sig %d newusp %p scp %p\n", p->p_comm, p->p_pid, sig, fp, &fp->sf_sc); #ifdef DDB if (sigdebug & SDB_DDB) Debugger(); #endif } #endif /* * Now set up the signal frame. We build it in kernel space * and then copy it out. We probably ought to just build it * directly in user space.... */ sf.sf_signo = sig; sf.sf_code = ksi->ksi_trap; #ifndef __arch64__ sf.sf_scp = 0; sf.sf_addr = 0; /* XXX */ #endif /* * Build the signal context to be used by sigreturn. */ sf.sf_sc.sc_onstack = l->l_sigstk.ss_flags & SS_ONSTACK; sf.sf_sc.sc_mask = *mask; #ifdef COMPAT_13 /* * 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(mask, &sf.sf_sc.__sc_mask13); #endif /* Save register context. */ sf.sf_sc.sc_sp = (long)tf->tf_out[6]; sf.sf_sc.sc_pc = tf->tf_pc; sf.sf_sc.sc_npc = tf->tf_npc; #ifdef __arch64__ sf.sf_sc.sc_tstate = tf->tf_tstate; /* XXX */ #else sf.sf_sc.sc_psr = TSTATECCR_TO_PSR(tf->tf_tstate); /* XXX */ #endif sf.sf_sc.sc_g1 = tf->tf_global[1]; sf.sf_sc.sc_o0 = tf->tf_out[0]; /* * Put the stack in a consistent state before we whack away * at it. Note that write_user_windows may just dump the * registers into the pcb; we need them in the process's memory. * We also need to make sure that when we start the signal handler, * its %i6 (%fp), which is loaded from the newly allocated stack area, * joins seamlessly with the frame it was in when the signal occurred, * so that the debugger and _longjmp code can back up through it. */ sendsig_reset(l, sig); mutex_exit(p->p_lock); newsp = (struct rwindow *)((vaddr_t)fp - sizeof(struct rwindow)); write_user_windows(); #ifdef DEBUG if ((sigdebug & SDB_KSTACK)) printf("sendsig: saving sf to %p, setting stack pointer %p to %p\n", fp, &(((struct rwindow *)newsp)->rw_in[6]), (void *)(unsigned long)tf->tf_out[6]); #endif error = (rwindow_save(l) || copyout((void *)&sf, (void *)fp, sizeof sf) || #ifdef NOT_DEBUG copyin(oldsp, &tmpwin, sizeof(tmpwin)) || copyout(&tmpwin, newsp, sizeof(tmpwin)) || #endif CPOUTREG(&(((struct rwindow *)newsp)->rw_in[6]), tf->tf_out[6])); mutex_enter(p->p_lock); if (error) { /* * Process has trashed its stack; give it an illegal * instruction to halt it in its tracks. */ #ifdef DEBUG mutex_exit(p->p_lock); if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) printf("sendsig: window save or copyout error\n"); printf("sendsig: stack was trashed trying to send sig %d, sending SIGILL\n", sig); #ifdef DDB if (sigdebug & SDB_DDB) Debugger(); #endif mutex_enter(p->p_lock); #endif sigexit(l, SIGILL); /* NOTREACHED */ } #ifdef DEBUG if (sigdebug & SDB_FOLLOW) { printf("sendsig: %s[%d] sig %d scp %p\n", p->p_comm, p->p_pid, sig, &fp->sf_sc); } #endif /* * Arrange to continue execution at the code copied out in exec(). * It needs the function to call in %g1, and a new stack pointer. */ switch (ps->sa_sigdesc[sig].sd_vers) { case __SIGTRAMP_SIGCODE_VERSION: /* legacy on-stack sigtramp */ addr = p->p_sigctx.ps_sigcode; break; case __SIGTRAMP_SIGCONTEXT_VERSION: addr = ps->sa_sigdesc[sig].sd_tramp; break; default: addr = NULL; /* XXX: gcc */ /* Don't know what trampoline version; kill it. */ sigexit(l, SIGILL); } tf->tf_global[1] = (vaddr_t)catcher; tf->tf_pc = (const vaddr_t)addr; tf->tf_npc = (const vaddr_t)addr + 4; tf->tf_out[6] = (vaddr_t)newsp - STACK_OFFSET; /* Remember that we're now on the signal stack. */ if (onstack) l->l_sigstk.ss_flags |= SS_ONSTACK; #ifdef DEBUG if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) { mutex_exit(p->p_lock); printf("sendsig: about to return to catcher %p thru %p\n", catcher, (void *)(unsigned long)addr); #ifdef DDB if (sigdebug & SDB_DDB) Debugger(); #endif mutex_enter(p->p_lock); } #endif } /* * System call to cleanup state after a signal * has been taken. Reset signal mask and * stack state from context left by sendsig (above), * and return to the given trap frame (if there is one). * Check carefully to make sure that the user has not * modified the state to gain improper privileges or to cause * a machine fault. */ int compat_16_sys___sigreturn14(struct lwp *, const struct compat_16_sys___sigreturn14_args *, register_t *); /* 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 sc, *scp; struct trapframe64 *tf; int error = EINVAL; struct proc *p = l->l_proc; /* First ensure consistent stack state (see sendsig). */ write_user_windows(); if (rwindow_save(l)) { #ifdef DEBUG printf("sigreturn14: rwindow_save(%p) failed, sending SIGILL\n", p); #ifdef DDB if (sigdebug & SDB_DDB) Debugger(); #endif #endif mutex_enter(p->p_lock); sigexit(l, SIGILL); } #ifdef DEBUG if (sigdebug & SDB_FOLLOW) { printf("sigreturn14: %s[%d], sigcntxp %p\n", p->p_comm, p->p_pid, SCARG(uap, sigcntxp)); #ifdef DDB if (sigdebug & SDB_DDB) Debugger(); #endif } #endif scp = SCARG(uap, sigcntxp); if (((vaddr_t)scp & 3) != 0 || (error = copyin((void *)scp, &sc, sizeof sc)) != 0) #ifdef DEBUG { printf("sigreturn14: copyin failed: scp=%p\n", scp); #ifdef DDB if (sigdebug & SDB_DDB) Debugger(); #endif return (error); } #else return (error); #endif scp = ≻ tf = l->l_md.md_tf; /* * Only the icc bits in the psr are used, so it need not be * verified. pc and npc must be multiples of 4. This is all * that is required; if it holds, just do it. */ if (((sc.sc_pc | sc.sc_npc) & 3) != 0 || (sc.sc_pc == 0) || (sc.sc_npc == 0)) #ifdef DEBUG { printf("sigreturn14: pc %p or npc %p invalid\n", (void *)(unsigned long)sc.sc_pc, (void *)(unsigned long)sc.sc_npc); #ifdef DDB if (sigdebug & SDB_DDB) Debugger(); #endif return (EINVAL); } #else return (EINVAL); #endif /* take only psr ICC field */ #ifdef __arch64__ tf->tf_tstate = (uint64_t)(tf->tf_tstate & ~TSTATE_CCR) | (scp->sc_tstate & TSTATE_CCR); #else tf->tf_tstate = (uint64_t)(tf->tf_tstate & ~TSTATE_CCR) | PSRCC_TO_TSTATE(scp->sc_psr); #endif tf->tf_pc = (uint64_t)scp->sc_pc; tf->tf_npc = (uint64_t)scp->sc_npc; tf->tf_global[1] = (uint64_t)scp->sc_g1; tf->tf_out[0] = (uint64_t)scp->sc_o0; tf->tf_out[6] = (uint64_t)scp->sc_sp; #ifdef DEBUG if (sigdebug & SDB_FOLLOW) { printf("sigreturn14: return trapframe pc=%p sp=%p tstate=%llx\n", (void *)(unsigned long)tf->tf_pc, (void *)(unsigned long)tf->tf_out[6], (unsigned long long)tf->tf_tstate); #ifdef DDB if (sigdebug & SDB_DDB) Debugger(); #endif } #endif mutex_enter(p->p_lock); /* Restore signal stack. */ if (sc.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, &sc.sc_mask, 0); mutex_exit(p->p_lock); return (EJUSTRETURN); } #endif /* COMPAT_16 */