/* $NetBSD: sunos_machdep.c,v 1.35 2023/12/20 05:33:59 thorpej Exp $ */ /* * Copyright (c) 1995 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: sunos_machdep.c,v 1.35 2023/12/20 05:33:59 thorpej Exp $"); #ifdef _KERNEL_OPT #include "opt_ddb.h" #endif #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #ifdef DEBUG #include #endif struct sunos_sigcontext { int sc_onstack; /* sigstack state to restore */ int sc_mask; /* signal mask to restore (old style) */ /* begin machine dependent portion */ int sc_sp; /* %sp to restore */ int sc_pc; /* pc to restore */ int sc_npc; /* npc to restore */ int sc_psr; /* pstate to restore */ int sc_g1; /* %g1 to restore */ int sc_o0; /* %o0 to restore */ }; struct sunos_sigframe { int sf_signo; /* signal number */ int sf_code; /* code */ uint32_t sf_scp; /* SunOS user addr of sigcontext */ int sf_addr; /* SunOS compat, always 0 for now */ struct sunos_sigcontext sf_sc; /* actual sigcontext */ }; void sunos_sendsig(const ksiginfo_t *ksi, const sigset_t *mask) { register struct lwp *l = curlwp; struct proc *p = l->l_proc; register struct sunos_sigframe *fp; register struct trapframe64 *tf; register int addr, onstack; struct rwindow32 *oldsp, *newsp; register32_t sp; int sig = ksi->ksi_signo, error; sig_t catcher = SIGACTION(p, sig).sa_handler; struct sunos_sigframe sf; tf = (struct trapframe64 *)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]; /* * Compute new user stack addresses, subtract off * one signal frame, and align. */ onstack = (l->l_sigstk.ss_flags & (SS_DISABLE | SS_ONSTACK)) == 0 && (SIGACTION(p, sig).sa_flags & SA_ONSTACK) != 0; if (onstack) fp = (struct sunos_sigframe *)((char *)l->l_sigstk.ss_sp + l->l_sigstk.ss_size); else fp = (struct sunos_sigframe *)oldsp; fp = (struct sunos_sigframe *)((long)(fp - 1) & ~7); #ifdef DEBUG sigpid = p->p_pid; if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) { printf("sunos_sendsig: %s[%d] sig %d newusp %p scp %p oldsp %p\n", p->p_comm, p->p_pid, sig, fp, &fp->sf_sc, oldsp); #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; 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 = l->l_sigstk.ss_flags & SS_ONSTACK; native_sigset_to_sigset13(mask, &sf.sf_sc.sc_mask); sf.sf_sc.sc_sp = (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("sunos_sendsig: saving sf to %p, setting stack pointer %p to %p\n", fp, &(((struct rwindow32 *)newsp)->rw_in[6]), oldsp); #endif sp = (register32_t)(uintptr_t)oldsp; error = (rwindow_save(l) || copyout((void *)&sf, (void *)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 if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) printf("sunos_sendsig: window save or copyout error\n"); printf("sunos_sendsig: stack was trashed trying to send sig %d, sending SIGILL\n", sig); #ifdef DDB if (sigdebug & SDB_DDB) Debugger(); #endif #endif sigexit(l, SIGILL); /* NOTREACHED */ } #ifdef DEBUG if (sigdebug & SDB_FOLLOW) { printf("sunos_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 = (long)catcher; /* user does his own trampolining */ tf->tf_pc = addr; tf->tf_npc = addr + 4; tf->tf_out[6] = (uint64_t)(u_int)(u_long)newsp; #ifdef DEBUG if ((sigdebug & SDB_KSTACK) && p->p_pid == sigpid) { printf("sunos_sendsig: about to return to catcher %p thru %p\n", catcher, (void *)(u_long)addr); #ifdef DDB if (sigdebug & SDB_DDB) Debugger(); #endif } #endif } int sunos_sys_sigreturn(register struct lwp *l, const struct sunos_sys_sigreturn_args *uap, register_t *retval) { struct proc *p = l->l_proc; struct sunos_sigcontext sc, *scp; sigset_t mask; struct trapframe64 *tf; /* First ensure consistent stack state (see sendsig). */ write_user_windows(); if (rwindow_save(l)) { mutex_enter(p->p_lock); sigexit(l, SIGILL); } #ifdef DEBUG if (sigdebug & SDB_FOLLOW) { printf("sunos_sigreturn: %s[%d], sigcntxp %p\n", p->p_comm, p->p_pid, SCARG(uap, sigcntxp)); #ifdef DDB if (sigdebug & SDB_DDB) Debugger(); #endif } #endif scp = (struct sunos_sigcontext *)SCARG(uap, sigcntxp); if ((vaddr_t)scp & 3 || (copyin((void *)scp, &sc, sizeof sc) != 0)) return (EFAULT); scp = ≻ tf = (struct trapframe64 *)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 (((scp->sc_pc | scp->sc_npc) & 3) != 0 || scp->sc_pc == 0 || scp->sc_npc == 0) #ifdef DEBUG { printf("sunos_sigreturn: pc %p or npc %p invalid\n", (void *)(u_long)scp->sc_pc, (void *)(u_long)scp->sc_npc); #ifdef DDB Debugger(); #endif return (EINVAL); } #endif return (EINVAL); /* take only psr ICC field */ tf->tf_tstate = (int64_t)(tf->tf_tstate & ~TSTATE_CCR) | PSRCC_TO_TSTATE(scp->sc_psr); tf->tf_pc = scp->sc_pc; tf->tf_npc = scp->sc_npc; tf->tf_global[1] = scp->sc_g1; tf->tf_out[0] = scp->sc_o0; tf->tf_out[6] = scp->sc_sp; #ifdef DEBUG if (sigdebug & SDB_FOLLOW) { printf("sunos_sigreturn: return trapframe pc=%p sp=%p tstate=%llx\n", (void *)(u_long)tf->tf_pc, (void *)(u_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); if (scp->sc_onstack & SS_ONSTACK) l->l_sigstk.ss_flags |= SS_ONSTACK; else l->l_sigstk.ss_flags &= ~SS_ONSTACK; /* Restore signal mask */ native_sigset13_to_sigset(&scp->sc_mask, &mask); (void) sigprocmask1(l, SIG_SETMASK, &mask, 0); mutex_exit(p->p_lock); return (EJUSTRETURN); }