xref: /src/sys/arch/hppa/hppa/sig_machdep.c

/*	$NetBSD: sig_machdep.c,v 1.28 2021/10/27 04:14:59 thorpej Exp $	*/

/*-
 * Copyright (c) 2002 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Matthew Fredette.
 *
 * 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) 1988 University of Utah.
 * Copyright (c) 1982, 1986, 1990, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * the Systems Programming Group of the University of Utah Computer
 * Science Department.
 *
 * 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.
 *
 *	from: Utah Hdr: machdep.c 1.74 92/12/20
 *	from: @(#)machdep.c	8.10 (Berkeley) 4/20/94
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: sig_machdep.c,v 1.28 2021/10/27 04:14:59 thorpej Exp $");

#include "opt_compat_netbsd.h"

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/kernel.h>
#include <sys/proc.h>
#include <sys/signal.h>
#include <sys/signalvar.h>

#include <sys/mount.h>
#include <sys/syscallargs.h>

#include <machine/cpu.h>
#include <machine/pcb.h>
#include <machine/reg.h>
#include <machine/frame.h>

#ifdef DEBUG
int sigdebug = 0;
int sigpid = 0;
#define SDB_FOLLOW	0x01
#define SDB_KSTACK	0x02
#define SDB_FPSTATE	0x04
#endif

static void *getframe(struct lwp *, int, int *);
static void *
getframe(struct lwp *l, int sig, int *onstack)
{
	struct proc *p = l->l_proc;
	struct trapframe *tf = l->l_md.md_regs;

	/* 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)
		return (void *)HPPA_FRAME_ROUND(l->l_sigstk.ss_sp);
	else
		return (void *)HPPA_FRAME_ROUND(tf->tf_sp);
}

struct sigframe_siginfo {
	siginfo_t sf_si;
	ucontext_t sf_uc;
};

void
sendsig_siginfo(const struct ksiginfo *ksi, const sigset_t *mask)
{
	struct lwp *l = curlwp;
	struct proc *p = l->l_proc;
	struct pcb *pcb = lwp_getpcb(l);
	struct sigacts *ps = p->p_sigacts;
	struct sigframe_siginfo *fp, frame;
	struct trapframe *tf;
	int sig = ksi->ksi_signo;
	sig_t catcher = SIGACTION(p, sig).sa_handler;
	int onstack, error;

	fp = getframe(l, sig, &onstack);
	tf = (struct trapframe *)l->l_md.md_regs;

	/* Build stack frame for signal trampoline. */
	switch (ps->sa_sigdesc[sig].sd_vers) {
	default:
		printf("sendsig_siginfo: bad version %d\n",
		       ps->sa_sigdesc[sig].sd_vers);
		sigexit(l, SIGILL);
	case __SIGTRAMP_SIGINFO_VERSION:
		break;
	}

	memset(&frame, 0, sizeof(frame));
	frame.sf_si._info = ksi->ksi_info;
	frame.sf_uc.uc_flags = _UC_SIGMASK |
		((l->l_sigstk.ss_flags & SS_ONSTACK) ?
		 _UC_SETSTACK : _UC_CLRSTACK);
	frame.sf_uc.uc_sigmask = *mask;
	frame.sf_uc.uc_link = l->l_ctxlink;
	sendsig_reset(l, sig);
	mutex_exit(p->p_lock);
	cpu_getmcontext(l, &frame.sf_uc.uc_mcontext, &frame.sf_uc.uc_flags);
	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 */
	}

	/*
	 * Set up the registers to invoke the signal trampoline.
	 */
	tf->tf_arg0 = sig;
	tf->tf_arg1 = (__greg_t)&fp->sf_si;
	tf->tf_arg2 = (__greg_t)&fp->sf_uc;
	tf->tf_r3 = (__greg_t)&fp->sf_uc;

	fp++;
	tf->tf_iisq_head = tf->tf_iisq_tail = pcb->pcb_space;
	tf->tf_iioq_head =
		(__greg_t)ps->sa_sigdesc[sig].sd_tramp | HPPA_PC_PRIV_USER;
	tf->tf_iioq_tail = tf->tf_iioq_head + 4;
	tf->tf_arg3 = (__greg_t)catcher;
	tf->tf_sp = HPPA_FRAME_ROUND(fp);

	/* Remember that we're now on the signal stack. */
	if (onstack)
		l->l_sigstk.ss_flags |= SS_ONSTACK;
}