/* $NetBSD: netbsd32_machdep_16.c,v 1.3 2019/03/01 11:06:55 pgoyette Exp $ */ /* * Copyright (c) 1998, 2001 Matthew R. Green * All rights reserved. * * 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 AUTHOR ``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 AUTHOR 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: netbsd32_machdep_16.c,v 1.3 2019/03/01 11:06:55 pgoyette Exp $"); #ifdef _KERNEL_OPT #include "opt_compat_netbsd.h" #include "opt_modular.h" #include "opt_execfmt.h" #include "firm_events.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include void netbsd32_sendsig_siginfo(const ksiginfo_t *, const sigset_t *); void netbsd32_sendsig_16(const ksiginfo_t *, const sigset_t *); /* * NB: since this is a 32-bit address world, sf_scp and sf_sc * can't be a pointer since those are 64-bits wide. */ struct sparc32_sigframe { int sf_signo; /* signal number */ int sf_code; /* code */ u_int sf_scp; /* SunOS user addr of sigcontext */ int sf_addr; /* SunOS compat, always 0 for now */ struct netbsd32_sigcontext sf_sc; /* actual sigcontext */ }; extern struct netbsd32_sendsig_hook_t netbsd32_sendsig_hook; #undef DEBUG #ifdef DEBUG extern int sigdebug; #endif static void netbsd32_sendsig_sigcontext(const ksiginfo_t *ksi, const sigset_t *mask) { int sig = ksi->ksi_signo; struct lwp *l = curlwp; struct proc *p = l->l_proc; struct sparc32_sigframe *fp; struct trapframe64 *tf; int addr, onstack, error; struct rwindow32 *oldsp, *newsp; register32_t sp; sig_t catcher = SIGACTION(p, sig).sa_handler; struct sparc32_sigframe sf; extern char netbsd32_sigcode[], netbsd32_esigcode[]; #define szsigcode (netbsd32_esigcode - netbsd32_sigcode) tf = l->l_md.md_tf; /* Need to attempt to zero extend this 32-bit pointer */ oldsp = (struct rwindow32 *)(u_long)(u_int)tf->tf_out[6]; /* Do we need to jump onto the signal stack? */ onstack = (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; if (onstack) { fp = (struct sparc32_sigframe *)((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size); l->l_sigstk.ss_flags |= SS_ONSTACK; } else fp = (struct sparc32_sigframe *)oldsp; fp = (struct sparc32_sigframe *)((u_long)(fp - 1) & ~7); #ifdef DEBUG sigpid = p->p_pid; if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) { printf("sendsig: %s[%d] sig %d newusp %p scp %p oldsp %p\n", p->p_comm, p->p_pid, sig, fp, &fp->sf_sc, oldsp); if (sigdebug & SDB_DDB) Debugger(); } #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.... */ memset(&sf, 0, sizeof(sf)); sf.sf_signo = sig; sf.sf_code = (u_int)ksi->ksi_trap; sf.sf_scp = (u_long)&fp->sf_sc; sf.sf_addr = 0; /* XXX */ /* * Build the signal context to be used by sigreturn. */ sf.sf_sc.sc_onstack = onstack; sf.sf_sc.sc_mask = *mask; sf.sf_sc.sc_sp = (u_long)oldsp; sf.sf_sc.sc_pc = tf->tf_pc; sf.sf_sc.sc_npc = tf->tf_npc; sf.sf_sc.sc_psr = TSTATECCR_TO_PSR(tf->tf_tstate); /* XXX */ 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 rwindow32 *)((long)fp - sizeof(struct rwindow32)); write_user_windows(); #ifdef DEBUG if ((sigdebug & SDB_KSTACK)) printf("sendsig: saving sf to %p, setting stack pointer %p to %p\n", fp, &(((struct rwindow32 *)newsp)->rw_in[6]), oldsp); #endif sp = NETBSD32PTR32I(oldsp); error = (rwindow_save(l) || copyout(&sf, fp, sizeof sf) || copyout(&sp, &(((struct rwindow32 *)newsp)->rw_in[6]), sizeof(sp))); 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); if (sigdebug & SDB_DDB) Debugger(); 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. */ addr = p->p_psstrp - szsigcode; tf->tf_global[1] = (long)catcher; tf->tf_pc = addr; tf->tf_npc = addr + 4; tf->tf_out[6] = (uint64_t)(u_int)(u_long)newsp; /* 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, addr); if (sigdebug & SDB_DDB) Debugger(); mutex_enter(p->p_lock); } #endif } struct sparc32_sigframe_siginfo { siginfo32_t sf_si; ucontext32_t sf_uc; }; void netbsd32_sendsig_16(const ksiginfo_t *ksi, const sigset_t *mask) { if (curproc->p_sigacts->sa_sigdesc[ksi->ksi_signo].sd_vers < 2) netbsd32_sendsig_sigcontext(ksi, mask); else netbsd32_sendsig_siginfo(ksi, mask); } #undef DEBUG /* * 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. */ /* ARGSUSED */ int compat_16_netbsd32___sigreturn14(struct lwp *l, const struct compat_16_netbsd32___sigreturn14_args *uap, register_t *retval) { /* { syscallarg(struct sigcontext *) sigcntxp; } */ struct netbsd32_sigcontext sc, *scp; struct trapframe64 *tf; struct proc *p = l->l_proc; /* First ensure consistent stack state (see sendsig). */ write_user_windows(); if (rwindow_save(l)) { #ifdef DEBUG printf("netbsd32_sigreturn14: rwindow_save(%p) failed, sending SIGILL\n", p); Debugger(); #endif mutex_enter(p->p_lock); sigexit(l, SIGILL); } #ifdef DEBUG if (sigdebug & SDB_FOLLOW) { printf("netbsd32_sigreturn14: %s[%d], sigcntxp %p\n", p->p_comm, p->p_pid, SCARG(uap, sigcntxp)); if (sigdebug & SDB_DDB) Debugger(); } #endif scp = (struct netbsd32_sigcontext *)(u_long)SCARG(uap, sigcntxp); if ((vaddr_t)scp & 3 || (copyin((void *)scp, &sc, sizeof sc) != 0)) { #ifdef DEBUG printf("netbsd32_sigreturn14: copyin failed: scp=%p\n", scp); Debugger(); #endif return (EINVAL); } 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("netbsd32_sigreturn14: pc %p or npc %p invalid\n", sc.sc_pc, sc.sc_npc); Debugger(); return (EINVAL); } #else return (EINVAL); #endif /* take only psr ICC field */ tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | PSRCC_TO_TSTATE(sc.sc_psr); tf->tf_pc = (int64_t)sc.sc_pc; tf->tf_npc = (int64_t)sc.sc_npc; tf->tf_global[1] = (int64_t)sc.sc_g1; tf->tf_out[0] = (int64_t)sc.sc_o0; tf->tf_out[6] = (int64_t)sc.sc_sp; #ifdef DEBUG if (sigdebug & SDB_FOLLOW) { printf("netbsd32_sigreturn14: return trapframe pc=%p sp=%p tstate=%llx\n", (vaddr_t)tf->tf_pc, (vaddr_t)tf->tf_out[6], tf->tf_tstate); if (sigdebug & SDB_DDB) Debugger(); } #endif /* Restore signal stack. */ mutex_enter(p->p_lock); 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); } void netbsd32_machdep_md_16_init(void) { MODULE_HOOK_SET(netbsd32_sendsig_hook, "nb32_16", netbsd32_sendsig_16); } void netbsd32_machdep_md_16_fini(void) { MODULE_HOOK_UNSET(netbsd32_sendsig_hook); }