/*	$NetBSD: svr4_signal.c,v 1.39 2000/07/27 14:00:56 mrg Exp $	 */

/*-
 * Copyright (c) 1994, 1998 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Christos Zoulas and by Charles M. Hannum.
 *
 * 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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *        This product includes software developed by the NetBSD
 *        Foundation, Inc. and its contributors.
 * 4. Neither the name of The NetBSD Foundation 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 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 <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/filedesc.h>
#include <sys/ioctl.h>
#include <sys/mount.h>
#include <sys/kernel.h>
#include <sys/signal.h>
#include <sys/signalvar.h>
#include <sys/malloc.h>
#include <sys/wait.h>

#include <sys/syscallargs.h>

#include <compat/svr4/svr4_types.h>
#include <compat/svr4/svr4_signal.h>
#include <compat/svr4/svr4_lwp.h>
#include <compat/svr4/svr4_ucontext.h>
#include <compat/svr4/svr4_syscallargs.h>
#include <compat/svr4/svr4_util.h>
#include <compat/svr4/svr4_ucontext.h>

#define	svr4_sigmask(n)		(1 << (((n) - 1) & 31))
#define	svr4_sigword(n)		(((n) - 1) >> 5)
#define svr4_sigemptyset(s)	memset((s), 0, sizeof(*(s)))
#define	svr4_sigismember(s, n)	((s)->bits[svr4_sigword(n)] & svr4_sigmask(n))
#define	svr4_sigaddset(s, n)	((s)->bits[svr4_sigword(n)] |= svr4_sigmask(n))

static __inline void svr4_sigfillset __P((svr4_sigset_t *));
void svr4_to_native_sigaction __P((const struct svr4_sigaction *,
				struct sigaction *));
void native_to_svr4_sigaction __P((const struct sigaction *,
				struct svr4_sigaction *));

int native_to_svr4_sig[NSIG] = {
	0,
	SVR4_SIGHUP,
	SVR4_SIGINT,
	SVR4_SIGQUIT,
	SVR4_SIGILL,
	SVR4_SIGTRAP,
	SVR4_SIGABRT,
	SVR4_SIGEMT,
	SVR4_SIGFPE,
	SVR4_SIGKILL,
	SVR4_SIGBUS,
	SVR4_SIGSEGV,
	SVR4_SIGSYS,
	SVR4_SIGPIPE,
	SVR4_SIGALRM,
	SVR4_SIGTERM,
	SVR4_SIGURG,
	SVR4_SIGSTOP,
	SVR4_SIGTSTP,
	SVR4_SIGCONT,
	SVR4_SIGCHLD,
	SVR4_SIGTTIN,
	SVR4_SIGTTOU,
	SVR4_SIGIO,
	SVR4_SIGXCPU,
	SVR4_SIGXFSZ,
	SVR4_SIGVTALRM,
	SVR4_SIGPROF,
	SVR4_SIGWINCH,
	0,			/* SIGINFO */
	SVR4_SIGUSR1,
	SVR4_SIGUSR2,
	SVR4_SIGPWR,
};

int svr4_to_native_sig[SVR4_NSIG] = {
	0,
	SIGHUP,
	SIGINT,
	SIGQUIT,
	SIGILL,
	SIGTRAP,
	SIGABRT,
	SIGEMT,
	SIGFPE,
	SIGKILL,
	SIGBUS,
	SIGSEGV,
	SIGSYS,
	SIGPIPE,
	SIGALRM,
	SIGTERM,
	SIGUSR1,
	SIGUSR2,
	SIGCHLD,
	SIGPWR,
	SIGWINCH,
	SIGURG,
	SIGIO,
	SIGSTOP,
	SIGTSTP,
	SIGCONT,
	SIGTTIN,
	SIGTTOU,
	SIGVTALRM,
	SIGPROF,
	SIGXCPU,
	SIGXFSZ,
};

static __inline void
svr4_sigfillset(s)
	svr4_sigset_t *s;
{
	int i;

	svr4_sigemptyset(s);
	for (i = 1; i < SVR4_NSIG; i++)
		if (svr4_to_native_sig[i] != 0)
			svr4_sigaddset(s, i);
}

void
svr4_to_native_sigset(sss, bss)
	const svr4_sigset_t *sss;
	sigset_t *bss;
{
	int i, newsig;

	sigemptyset(bss);
	for (i = 1; i < SVR4_NSIG; i++) {
		if (svr4_sigismember(sss, i)) {
			newsig = svr4_to_native_sig[i];
			if (newsig)
				sigaddset(bss, newsig);
		}
	}
}


void
native_to_svr4_sigset(bss, sss)
	const sigset_t *bss;
	svr4_sigset_t *sss;
{
	int i, newsig;

	svr4_sigemptyset(sss);
	for (i = 1; i < NSIG; i++) {
		if (sigismember(bss, i)) {
			newsig = native_to_svr4_sig[i];
			if (newsig)
				svr4_sigaddset(sss, newsig);
		}
	}
}

/*
 * XXX: Only a subset of the flags is currently implemented.
 */
void
svr4_to_native_sigaction(ssa, bsa)
	const struct svr4_sigaction *ssa;
	struct sigaction *bsa;
{

	bsa->sa_handler = (sig_t) ssa->sa_handler;
	svr4_to_native_sigset(&ssa->sa_mask, &bsa->sa_mask);
	bsa->sa_flags = 0;
	if ((ssa->sa_flags & SVR4_SA_ONSTACK) != 0)
		bsa->sa_flags |= SA_ONSTACK;
	if ((ssa->sa_flags & SVR4_SA_RESETHAND) != 0)
		bsa->sa_flags |= SA_RESETHAND;
	if ((ssa->sa_flags & SVR4_SA_RESTART) != 0)
		bsa->sa_flags |= SA_RESTART;
	if ((ssa->sa_flags & SVR4_SA_SIGINFO) != 0)
		DPRINTF(("svr4_to_native_sigaction: SA_SIGINFO ignored\n"));
	if ((ssa->sa_flags & SVR4_SA_NODEFER) != 0)
		bsa->sa_flags |= SA_NODEFER;
	if ((ssa->sa_flags & SVR4_SA_NOCLDWAIT) != 0)
		bsa->sa_flags |= SA_NOCLDWAIT;
	if ((ssa->sa_flags & SVR4_SA_NOCLDSTOP) != 0)
		bsa->sa_flags |= SA_NOCLDSTOP;
	if ((ssa->sa_flags & ~SVR4_SA_ALLBITS) != 0)
		DPRINTF(("svr4_to_native_sigaction: extra bits %x ignored\n",
		    ssa->sa_flags & ~SVR4_SA_ALLBITS));
}

void
native_to_svr4_sigaction(bsa, ssa)
	const struct sigaction *bsa;
	struct svr4_sigaction *ssa;
{

	ssa->sa_handler = (svr4_sig_t) bsa->sa_handler;
	native_to_svr4_sigset(&bsa->sa_mask, &ssa->sa_mask);
	ssa->sa_flags = 0;
	if ((bsa->sa_flags & SA_ONSTACK) != 0)
		ssa->sa_flags |= SVR4_SA_ONSTACK;
	if ((bsa->sa_flags & SA_RESETHAND) != 0)
		ssa->sa_flags |= SVR4_SA_RESETHAND;
	if ((bsa->sa_flags & SA_RESTART) != 0)
		ssa->sa_flags |= SVR4_SA_RESTART;
	if ((bsa->sa_flags & SA_NODEFER) != 0)
		ssa->sa_flags |= SVR4_SA_NODEFER;
	if ((bsa->sa_flags & SA_NOCLDSTOP) != 0)
		ssa->sa_flags |= SVR4_SA_NOCLDSTOP;
}

void
svr4_to_native_sigaltstack(sss, bss)
	const struct svr4_sigaltstack *sss;
	struct sigaltstack *bss;
{

	bss->ss_sp = sss->ss_sp;
	bss->ss_size = sss->ss_size;
	bss->ss_flags = 0;
	if ((sss->ss_flags & SVR4_SS_DISABLE) != 0)
		bss->ss_flags |= SS_DISABLE;
	if ((sss->ss_flags & SVR4_SS_ONSTACK) != 0)
		bss->ss_flags |= SS_ONSTACK;
	if ((sss->ss_flags & ~SVR4_SS_ALLBITS) != 0)
/*XXX*/		printf("svr4_to_native_sigaltstack: extra bits %x ignored\n",
		    sss->ss_flags & ~SVR4_SS_ALLBITS);
}

void
native_to_svr4_sigaltstack(bss, sss)
	const struct sigaltstack *bss;
	struct svr4_sigaltstack *sss;
{

	sss->ss_sp = bss->ss_sp;
	sss->ss_size = bss->ss_size;
	sss->ss_flags = 0;
	if ((bss->ss_flags & SS_DISABLE) != 0)
		sss->ss_flags |= SVR4_SS_DISABLE;
	if ((bss->ss_flags & SS_ONSTACK) != 0)
		sss->ss_flags |= SVR4_SS_ONSTACK;
}

int
svr4_sys_sigaction(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	struct svr4_sys_sigaction_args /* {
		syscallarg(int) signum;
		syscallarg(const struct svr4_sigaction *) nsa;
		syscallarg(struct svr4_sigaction *) osa;
	} */ *uap = v;
	struct svr4_sigaction nssa, ossa;
	struct sigaction nbsa, obsa;
	int error;

	if (SCARG(uap, nsa)) {
		error = copyin(SCARG(uap, nsa), &nssa, sizeof(nssa));
		if (error)
			return (error);
		svr4_to_native_sigaction(&nssa, &nbsa);
	}
	error = sigaction1(p, svr4_to_native_sig[SCARG(uap, signum)],
	    SCARG(uap, nsa) ? &nbsa : 0, SCARG(uap, osa) ? &obsa : 0);
	if (error)
		return (error);
	if (SCARG(uap, osa)) {
		native_to_svr4_sigaction(&obsa, &ossa);
		error = copyout(&ossa, SCARG(uap, osa), sizeof(ossa));
		if (error)
			return (error);
	}
	return (0);
}

int 
svr4_sys_sigaltstack(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	struct svr4_sys_sigaltstack_args /* {
		syscallarg(const struct svr4_sigaltstack *) nss;
		syscallarg(struct svr4_sigaltstack *) oss;
	} */ *uap = v;
	struct svr4_sigaltstack nsss, osss;
	struct sigaltstack nbss, obss;
	int error;

	if (SCARG(uap, nss)) {
		error = copyin(SCARG(uap, nss), &nsss, sizeof(nsss));
		if (error)
			return (error);
		svr4_to_native_sigaltstack(&nsss, &nbss);
	}
	error = sigaltstack1(p,
	    SCARG(uap, nss) ? &nbss : 0, SCARG(uap, oss) ? &obss : 0);
	if (error)
		return (error);
	if (SCARG(uap, oss)) {
		native_to_svr4_sigaltstack(&obss, &osss);
		error = copyout(&osss, SCARG(uap, oss), sizeof(osss));
		if (error)
			return (error);
	}
	return (0);
}

/*
 * Stolen from the ibcs2 one
 */
int
svr4_sys_signal(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	struct svr4_sys_signal_args /* {
		syscallarg(int) signum;
		syscallarg(svr4_sig_t) handler;
	} */ *uap = v;
	int signum = svr4_to_native_sig[SVR4_SIGNO(SCARG(uap, signum))];
	struct sigaction nbsa, obsa;
	sigset_t ss;
	int error;

	if (signum <= 0 || signum >= SVR4_NSIG)
		return (EINVAL);

	switch (SVR4_SIGCALL(SCARG(uap, signum))) {
	case SVR4_SIGDEFER_MASK:
		if (SCARG(uap, handler) == SVR4_SIG_HOLD)
			goto sighold;
		/* FALLTHROUGH */

	case SVR4_SIGNAL_MASK:
		nbsa.sa_handler = (sig_t)SCARG(uap, handler);
		sigemptyset(&nbsa.sa_mask);
		nbsa.sa_flags = 0;
		error = sigaction1(p, signum, &nbsa, &obsa);
		if (error)
			return (error);
		*retval = (u_int)(u_long)obsa.sa_handler;
		return (0);

	case SVR4_SIGHOLD_MASK:
	sighold:
		sigemptyset(&ss);
		sigaddset(&ss, signum);
		return (sigprocmask1(p, SIG_BLOCK, &ss, 0));

	case SVR4_SIGRELSE_MASK:
		sigemptyset(&ss);
		sigaddset(&ss, signum);
		return (sigprocmask1(p, SIG_UNBLOCK, &ss, 0));

	case SVR4_SIGIGNORE_MASK:
		nbsa.sa_handler = SIG_IGN;
		sigemptyset(&nbsa.sa_mask);
		nbsa.sa_flags = 0;
		return (sigaction1(p, signum, &nbsa, 0));

	case SVR4_SIGPAUSE_MASK:
		ss = p->p_sigmask;
		sigdelset(&ss, signum);
		return (sigsuspend1(p, &ss));

	default:
		return (ENOSYS);
	}
}

int
svr4_sys_sigprocmask(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	struct svr4_sys_sigprocmask_args /* {
		syscallarg(int) how;
		syscallarg(const svr4_sigset_t *) set;
		syscallarg(svr4_sigset_t *) oset;
	} */ *uap = v;
	svr4_sigset_t nsss, osss;
	sigset_t nbss, obss;
	int how;
	int error;

	/*
	 * Initialize how to 0 to avoid a compiler warning.  Note that
	 * this is safe because of the check in the default: case.
	 */
	how = 0;

	switch (SCARG(uap, how)) {
	case SVR4_SIG_BLOCK:
		how = SIG_BLOCK;
		break;
	case SVR4_SIG_UNBLOCK:
		how = SIG_UNBLOCK;
		break;
	case SVR4_SIG_SETMASK:
		how = SIG_SETMASK;
		break;
	default:
		if (SCARG(uap, set))
			return EINVAL;
		break;
	}

	if (SCARG(uap, set)) {
		error = copyin(SCARG(uap, set), &nsss, sizeof(nsss));
		if (error)
			return error;
		svr4_to_native_sigset(&nsss, &nbss);
	}
	error = sigprocmask1(p, how,
	    SCARG(uap, set) ? &nbss : NULL, SCARG(uap, oset) ? &obss : NULL);
	if (error)
		return error;
	if (SCARG(uap, oset)) {
		native_to_svr4_sigset(&obss, &osss);
		error = copyout(&osss, SCARG(uap, oset), sizeof(osss));
		if (error)
			return error;
	}
	return 0;
}

int
svr4_sys_sigpending(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	struct svr4_sys_sigpending_args /* {
		syscallarg(int) what;
		syscallarg(svr4_sigset_t *) set;
	} */ *uap = v;
	sigset_t bss;
	svr4_sigset_t sss;

	switch (SCARG(uap, what)) {
	case 1:	/* sigpending */
		sigpending1(p, &bss);
		native_to_svr4_sigset(&bss, &sss);
		break;

	case 2:	/* sigfillset */
		svr4_sigfillset(&sss);
		break;

	default:
		return (EINVAL);
	}
	return (copyout(&sss, SCARG(uap, set), sizeof(sss)));
}

int
svr4_sys_sigsuspend(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	struct svr4_sys_sigsuspend_args /* {
		syscallarg(const svr4_sigset_t *) set;
	} */ *uap = v;
	svr4_sigset_t sss;
	sigset_t bss;
	int error;

	if (SCARG(uap, set)) {
		error = copyin(SCARG(uap, set), &sss, sizeof(sss));
		if (error)
			return (error);
		svr4_to_native_sigset(&sss, &bss);
	}

	return (sigsuspend1(p, SCARG(uap, set) ? &bss : 0));
}

int
svr4_sys_pause(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{

	return (sigsuspend1(p, 0));
}

int
svr4_sys_kill(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	struct svr4_sys_kill_args /* {
		syscallarg(int) pid;
		syscallarg(int) signum;
	} */ *uap = v;
	struct sys_kill_args ka;

	SCARG(&ka, pid) = SCARG(uap, pid);
	SCARG(&ka, signum) = svr4_to_native_sig[SCARG(uap, signum)];
	return sys_kill(p, &ka, retval);
}

void
svr4_getcontext(p, uc, mask)
	struct proc *p;
	struct svr4_ucontext *uc;
	sigset_t *mask;
{
	void *sp;
	struct svr4_sigaltstack *ss = &uc->uc_stack;

	memset(uc, 0, sizeof(*uc));

	/* get machine context */
	sp = svr4_getmcontext(p, &uc->uc_mcontext, &uc->uc_flags);

	/* get link */
	uc->uc_link = p->p_ctxlink;

	/* get stack state. XXX: solaris appears to do this */
#if 0
	svr4_to_native_sigaltstack(&uc->uc_stack, &p->p_sigacts->ps_sigstk);
#else
	ss->ss_sp = (void *)(((u_long) sp) & ~(16384 - 1));
	ss->ss_size = 16384;
	ss->ss_flags = 0;
#endif
	/* get signal mask */
	native_to_svr4_sigset(mask, &uc->uc_sigmask);

	uc->uc_flags |= SVR4_UC_STACK|SVR4_UC_SIGMASK;
}


int
svr4_setcontext(p, uc)
	struct proc *p;
	struct svr4_ucontext *uc;
{
	int error;

	/* set machine context */
	if ((error = svr4_setmcontext(p, &uc->uc_mcontext, uc->uc_flags)) != 0)
		return error;

	/* set link */
	p->p_ctxlink = uc->uc_link;

	/* set signal stack */
	if (uc->uc_flags & SVR4_UC_STACK) {
		svr4_to_native_sigaltstack(&uc->uc_stack,
		    &p->p_sigacts->ps_sigstk);
	}

	/* set signal mask */
	if (uc->uc_flags & SVR4_UC_SIGMASK) {
		sigset_t mask;

		svr4_to_native_sigset(&uc->uc_sigmask, &mask);
		(void)sigprocmask1(p, SIG_SETMASK, &mask, 0);
	}

	return EJUSTRETURN;
}

int 
svr4_sys_context(p, v, retval)
	struct proc *p;
	void *v;
	register_t *retval;
{
	struct svr4_sys_context_args /* {
		syscallarg(int) func;
		syscallarg(struct svr4_ucontext *) uc;
	} */ *uap = v;
	struct svr4_ucontext uc;
	int error;
	*retval = 0;

	switch (SCARG(uap, func)) {
	case SVR4_GETCONTEXT:
		DPRINTF(("getcontext(%p)\n", SCARG(uap, uc)));
		svr4_getcontext(p, &uc, &p->p_sigmask);
		return copyout(&uc, SCARG(uap, uc), sizeof(uc));

	case SVR4_SETCONTEXT: 
		DPRINTF(("setcontext(%p)\n", SCARG(uap, uc)));
		if (SCARG(uap, uc) == NULL)
			exit1(p, W_EXITCODE(0, 0));
		else if ((error = copyin(SCARG(uap, uc), &uc, sizeof(uc))) != 0)
			return error;
		else
			return svr4_setcontext(p, &uc);

	default:
		DPRINTF(("context(%d, %p)\n", SCARG(uap, func),
		    SCARG(uap, uc)));
		return ENOSYS;
	}
	return 0;
}