Rework signal code to allow using it by other modules, like linprocfs:

1. Linux sigset always 64 bit on all platforms. In order to move Linux
sigset code to the linux_common module define it as 64 bit int. Move
Linux sigset manipulation routines to the MI path.

2. Move Linux signal number definitions to the MI path. In general, they
are the same on all platforms except for a few signals.

3. Map Linux RT signals to the FreeBSD RT signals and hide signal conversion
tables to avoid conversion errors.

4. Emulate Linux SIGPWR signal via FreeBSD SIGRTMIN signal which is outside
of allowed on Linux signal numbers.

PR:		197216

6 files changed, 322 insertions, 104 deletions

diff --git a/sys/compat/linux/linux.c b/sys/compat/linux/linux.c
new file mode 100644
index 000000000000..d1d787742c63
--- /dev/null
+++ b/sys/compat/linux/linux.c
@@ -0,0 +1,205 @@
+/*-
+ * Copyright (c) 2015 Dmitry Chagin
+ * 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 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 AUTHOR 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/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/signalvar.h>
+
+#include <compat/linux/linux.h>
+
+
+static int bsd_to_linux_sigtbl[LINUX_SIGTBLSZ] = {
+	LINUX_SIGHUP,	/* SIGHUP */
+	LINUX_SIGINT,	/* SIGINT */
+	LINUX_SIGQUIT,	/* SIGQUIT */
+	LINUX_SIGILL,	/* SIGILL */
+	LINUX_SIGTRAP,	/* SIGTRAP */
+	LINUX_SIGABRT,	/* SIGABRT */
+	0,		/* SIGEMT */
+	LINUX_SIGFPE,	/* SIGFPE */
+	LINUX_SIGKILL,	/* SIGKILL */
+	LINUX_SIGBUS,	/* SIGBUS */
+	LINUX_SIGSEGV,	/* SIGSEGV */
+	LINUX_SIGSYS,	/* SIGSYS */
+	LINUX_SIGPIPE,	/* SIGPIPE */
+	LINUX_SIGALRM,	/* SIGALRM */
+	LINUX_SIGTERM,	/* SIGTERM */
+	LINUX_SIGURG,	/* SIGURG */
+	LINUX_SIGSTOP,	/* SIGSTOP */
+	LINUX_SIGTSTP,	/* SIGTSTP */
+	LINUX_SIGCONT,	/* SIGCONT */
+	LINUX_SIGCHLD,	/* SIGCHLD */
+	LINUX_SIGTTIN,	/* SIGTTIN */
+	LINUX_SIGTTOU,	/* SIGTTOU */
+	LINUX_SIGIO,	/* SIGIO */
+	LINUX_SIGXCPU,	/* SIGXCPU */
+	LINUX_SIGXFSZ,	/* SIGXFSZ */
+	LINUX_SIGVTALRM,/* SIGVTALRM */
+	LINUX_SIGPROF,	/* SIGPROF */
+	LINUX_SIGWINCH,	/* SIGWINCH */
+	0,		/* SIGINFO */
+	LINUX_SIGUSR1,	/* SIGUSR1 */
+	LINUX_SIGUSR2	/* SIGUSR2 */
+};
+
+static int linux_to_bsd_sigtbl[LINUX_SIGTBLSZ] = {
+	SIGHUP,		/* LINUX_SIGHUP */
+	SIGINT,		/* LINUX_SIGINT */
+	SIGQUIT,	/* LINUX_SIGQUIT */
+	SIGILL,		/* LINUX_SIGILL */
+	SIGTRAP,	/* LINUX_SIGTRAP */
+	SIGABRT,	/* LINUX_SIGABRT */
+	SIGBUS,		/* LINUX_SIGBUS */
+	SIGFPE,		/* LINUX_SIGFPE */
+	SIGKILL,	/* LINUX_SIGKILL */
+	SIGUSR1,	/* LINUX_SIGUSR1 */
+	SIGSEGV,	/* LINUX_SIGSEGV */
+	SIGUSR2,	/* LINUX_SIGUSR2 */
+	SIGPIPE,	/* LINUX_SIGPIPE */
+	SIGALRM,	/* LINUX_SIGALRM */
+	SIGTERM,	/* LINUX_SIGTERM */
+	SIGBUS,		/* LINUX_SIGSTKFLT */
+	SIGCHLD,	/* LINUX_SIGCHLD */
+	SIGCONT,	/* LINUX_SIGCONT */
+	SIGSTOP,	/* LINUX_SIGSTOP */
+	SIGTSTP,	/* LINUX_SIGTSTP */
+	SIGTTIN,	/* LINUX_SIGTTIN */
+	SIGTTOU,	/* LINUX_SIGTTOU */
+	SIGURG,		/* LINUX_SIGURG */
+	SIGXCPU,	/* LINUX_SIGXCPU */
+	SIGXFSZ,	/* LINUX_SIGXFSZ */
+	SIGVTALRM,	/* LINUX_SIGVTALARM */
+	SIGPROF,	/* LINUX_SIGPROF */
+	SIGWINCH,	/* LINUX_SIGWINCH */
+	SIGIO,		/* LINUX_SIGIO */
+	/*
+	 * FreeBSD does not have SIGPWR signal, map Linux SIGPWR signal
+	 * to the first unused FreeBSD signal number. Since Linux supports
+	 * signals from 1 to 64 we are ok here as our SIGRTMIN = 65.
+	 */
+	SIGRTMIN,	/* LINUX_SIGPWR */
+	SIGSYS		/* LINUX_SIGSYS */
+};
+
+/*
+ * Map Linux RT signals to the FreeBSD RT signals.
+ */
+static inline int
+linux_to_bsd_rt_signal(int sig)
+{
+
+	return (SIGRTMIN + 1 + sig - LINUX_SIGRTMIN);
+}
+
+static inline int
+bsd_to_linux_rt_signal(int sig)
+{
+
+	return (sig - SIGRTMIN - 1 + LINUX_SIGRTMIN);
+}
+
+int
+linux_to_bsd_signal(int sig)
+{
+
+	KASSERT(sig > 0 && sig <= LINUX_SIGRTMAX, ("Invalid Linux signal\n"));
+
+	if (sig < LINUX_SIGRTMIN)
+		return (linux_to_bsd_sigtbl[_SIG_IDX(sig)]);
+
+	return (linux_to_bsd_rt_signal(sig));
+}
+
+int
+bsd_to_linux_signal(int sig)
+{
+
+	if (sig <= LINUX_SIGTBLSZ)
+		return (bsd_to_linux_sigtbl[_SIG_IDX(sig)]);
+	if (sig == SIGRTMIN)
+		return (LINUX_SIGPWR);
+
+	return (bsd_to_linux_rt_signal(sig));
+}
+
+int
+linux_to_bsd_sigaltstack(int lsa)
+{
+	int bsa = 0;
+
+	if (lsa & LINUX_SS_DISABLE)
+		bsa |= SS_DISABLE;
+	/*
+	 * Linux ignores SS_ONSTACK flag for ss
+	 * parameter while FreeBSD prohibits it.
+	 */
+	return (bsa);
+}
+
+int
+bsd_to_linux_sigaltstack(int bsa)
+{
+	int lsa = 0;
+
+	if (bsa & SS_DISABLE)
+		lsa |= LINUX_SS_DISABLE;
+	if (bsa & SS_ONSTACK)
+		lsa |= LINUX_SS_ONSTACK;
+	return (lsa);
+}
+
+void
+linux_to_bsd_sigset(l_sigset_t *lss, sigset_t *bss)
+{
+	int b, l;
+
+	SIGEMPTYSET(*bss);
+	for (l = 1; l <= LINUX_SIGRTMAX; l++) {
+		if (LINUX_SIGISMEMBER(*lss, l)) {
+			b = linux_to_bsd_signal(l);
+			if (b)
+				SIGADDSET(*bss, b);
+		}
+	}
+}
+
+void
+bsd_to_linux_sigset(sigset_t *bss, l_sigset_t *lss)
+{
+	int b, l;
+
+	LINUX_SIGEMPTYSET(*lss);
+	for (b = 1; b <= SIGRTMAX; b++) {
+		if (SIGISMEMBER(*bss, b)) {
+			l = bsd_to_linux_signal(b);
+			if (l)
+				LINUX_SIGADDSET(*lss, l);
+		}
+	}
+}
diff --git a/sys/compat/linux/linux.h b/sys/compat/linux/linux.h
new file mode 100644
index 000000000000..974440f94c26
--- /dev/null
+++ b/sys/compat/linux/linux.h
@@ -0,0 +1,95 @@
+/*-
+ * Copyright (c) 2015 Dmitry Chagin
+ * 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 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 AUTHOR 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.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _LINUX_MI_H_
+#define _LINUX_MI_H_
+
+/* sigaltstack */
+#define	LINUX_SS_ONSTACK	1
+#define	LINUX_SS_DISABLE	2
+
+int linux_to_bsd_sigaltstack(int lsa);
+int bsd_to_linux_sigaltstack(int bsa);
+
+/* sigset */
+typedef struct {
+	uint64_t	__mask;
+} l_sigset_t;
+
+/* primitives to manipulate sigset_t */
+#define	LINUX_SIGEMPTYSET(set)		(set).__mask = 0
+#define	LINUX_SIGISMEMBER(set, sig)	(1UL & ((set).__mask >> _SIG_IDX(sig)))
+#define	LINUX_SIGADDSET(set, sig)	(set).__mask |= 1UL << _SIG_IDX(sig)
+
+void linux_to_bsd_sigset(l_sigset_t *, sigset_t *);
+void bsd_to_linux_sigset(sigset_t *, l_sigset_t *);
+
+/* signaling */
+#define	LINUX_SIGHUP		1
+#define	LINUX_SIGINT		2
+#define	LINUX_SIGQUIT		3
+#define	LINUX_SIGILL		4
+#define	LINUX_SIGTRAP		5
+#define	LINUX_SIGABRT		6
+#define	LINUX_SIGIOT		LINUX_SIGABRT
+#define	LINUX_SIGBUS		7
+#define	LINUX_SIGFPE		8
+#define	LINUX_SIGKILL		9
+#define	LINUX_SIGUSR1		10
+#define	LINUX_SIGSEGV		11
+#define	LINUX_SIGUSR2		12
+#define	LINUX_SIGPIPE		13
+#define	LINUX_SIGALRM		14
+#define	LINUX_SIGTERM		15
+#define	LINUX_SIGSTKFLT		16
+#define	LINUX_SIGCHLD		17
+#define	LINUX_SIGCONT		18
+#define	LINUX_SIGSTOP		19
+#define	LINUX_SIGTSTP		20
+#define	LINUX_SIGTTIN		21
+#define	LINUX_SIGTTOU		22
+#define	LINUX_SIGURG		23
+#define	LINUX_SIGXCPU		24
+#define	LINUX_SIGXFSZ		25
+#define	LINUX_SIGVTALRM		26
+#define	LINUX_SIGPROF		27
+#define	LINUX_SIGWINCH		28
+#define	LINUX_SIGIO		29
+#define	LINUX_SIGPOLL		LINUX_SIGIO
+#define	LINUX_SIGPWR		30
+#define	LINUX_SIGSYS		31
+#define	LINUX_SIGTBLSZ		31
+#define	LINUX_SIGRTMIN		32
+#define	LINUX_SIGRTMAX		64
+
+#define LINUX_SIG_VALID(sig)	((sig) <= LINUX_SIGRTMAX && (sig) > 0)
+
+int linux_to_bsd_signal(int sig);
+int bsd_to_linux_signal(int sig);
+
+#endif /* _LINUX_MI_H_ */
diff --git a/sys/compat/linux/linux_fork.c b/sys/compat/linux/linux_fork.c
index eee0fe8c5084..0fd47fdd26fb 100644
--- a/sys/compat/linux/linux_fork.c
+++ b/sys/compat/linux/linux_fork.c
@@ -56,7 +56,6 @@ __FBSDID("$FreeBSD$");
 #include <machine/../linux/linux.h>
 #include <machine/../linux/linux_proto.h>
 #endif
-#include <compat/linux/linux_signal.h>
 #include <compat/linux/linux_emul.h>
 #include <compat/linux/linux_futex.h>
 #include <compat/linux/linux_misc.h>
@@ -159,9 +158,7 @@ linux_clone_proc(struct thread *td, struct linux_clone_args *args)
 
 	exit_signal = args->flags & 0x000000ff;
 	if (LINUX_SIG_VALID(exit_signal)) {
-		if (exit_signal <= LINUX_SIGTBLSZ)
-			exit_signal =
-			    linux_to_bsd_signal[_SIG_IDX(exit_signal)];
+		exit_signal = linux_to_bsd_signal(exit_signal);
 	} else if (exit_signal != 0)
 		return (EINVAL);
 
diff --git a/sys/compat/linux/linux_misc.c b/sys/compat/linux/linux_misc.c
index 15764bcd5157..b00dc073eab0 100644
--- a/sys/compat/linux/linux_misc.c
+++ b/sys/compat/linux/linux_misc.c
@@ -871,10 +871,10 @@ linux_common_wait(struct thread *td, int pid, int *status,
 		tmpstat &= 0xffff;
 		if (WIFSIGNALED(tmpstat))
 			tmpstat = (tmpstat & 0xffffff80) |
-			    BSD_TO_LINUX_SIGNAL(WTERMSIG(tmpstat));
+			    bsd_to_linux_signal(WTERMSIG(tmpstat));
 		else if (WIFSTOPPED(tmpstat))
 			tmpstat = (tmpstat & 0xffff00ff) |
-			    (BSD_TO_LINUX_SIGNAL(WSTOPSIG(tmpstat)) << 8);
+			    (bsd_to_linux_signal(WSTOPSIG(tmpstat)) << 8);
 		else if (WIFCONTINUED(tmpstat))
 			tmpstat = 0xffff;
 		error = copyout(&tmpstat, status, sizeof(int));
@@ -987,7 +987,7 @@ linux_waitid(struct thread *td, struct linux_waitid_args *args)
 		if (td->td_retval[0] == 0)
 			bzero(&lsi, sizeof(lsi));
 		else {
-			sig = BSD_TO_LINUX_SIGNAL(siginfo.si_signo);
+			sig = bsd_to_linux_signal(siginfo.si_signo);
 			siginfo_to_lsiginfo(&siginfo, &lsi, sig);
 		}
 		error = copyout(&lsi, args->info, sizeof(lsi));
diff --git a/sys/compat/linux/linux_signal.c b/sys/compat/linux/linux_signal.c
index f60e7312c5bb..0ecf537467c3 100644
--- a/sys/compat/linux/linux_signal.c
+++ b/sys/compat/linux/linux_signal.c
@@ -60,42 +60,6 @@ static int	linux_do_tkill(struct thread *td, struct thread *tdt,
 static void	sicode_to_lsicode(int si_code, int *lsi_code);
 
 
-#if defined(__i386__) || (defined(__amd64__) && defined(COMPAT_LINUX32))
-void
-linux_to_bsd_sigset(l_sigset_t *lss, sigset_t *bss)
-{
-	int b, l;
-
-	SIGEMPTYSET(*bss);
-	bss->__bits[0] = lss->__bits[0] & ~((1U << LINUX_SIGTBLSZ) - 1);
-	bss->__bits[1] = lss->__bits[1];
-	for (l = 1; l <= LINUX_SIGTBLSZ; l++) {
-		if (LINUX_SIGISMEMBER(*lss, l)) {
-			b = linux_to_bsd_signal[_SIG_IDX(l)];
-			if (b)
-				SIGADDSET(*bss, b);
-		}
-	}
-}
-
-void
-bsd_to_linux_sigset(sigset_t *bss, l_sigset_t *lss)
-{
-	int b, l;
-
-	LINUX_SIGEMPTYSET(*lss);
-	lss->__bits[0] = bss->__bits[0] & ~((1U << LINUX_SIGTBLSZ) - 1);
-	lss->__bits[1] = bss->__bits[1];
-	for (b = 1; b <= LINUX_SIGTBLSZ; b++) {
-		if (SIGISMEMBER(*bss, b)) {
-			l = bsd_to_linux_signal[_SIG_IDX(b)];
-			if (l)
-				LINUX_SIGADDSET(*lss, l);
-		}
-	}
-}
-#endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
-
 static void
 linux_to_bsd_sigaction(l_sigaction_t *lsa, struct sigaction *bsa)
 {
@@ -163,11 +127,7 @@ linux_do_sigaction(struct thread *td, int linux_sig, l_sigaction_t *linux_nsa,
 		linux_to_bsd_sigaction(linux_nsa, nsa);
 	} else
 		nsa = NULL;
-
-	if (linux_sig <= LINUX_SIGTBLSZ)
-		sig = linux_to_bsd_signal[_SIG_IDX(linux_sig)];
-	else
-		sig = linux_sig;
+	sig = linux_to_bsd_signal(linux_sig);
 
 	error = kern_sigaction(td, sig, nsa, osa, 0);
 	if (error)
@@ -289,7 +249,7 @@ linux_sigprocmask(struct thread *td, struct linux_sigprocmask_args *args)
 		if (error)
 			return (error);
 		LINUX_SIGEMPTYSET(set);
-		set.__bits[0] = mask;
+		set.__mask = mask;
 	}
 
 	error = linux_do_sigprocmask(td, args->how,
@@ -297,7 +257,7 @@ linux_sigprocmask(struct thread *td, struct linux_sigprocmask_args *args)
 				     args->omask ? &oset : NULL);
 
 	if (args->omask != NULL && !error) {
-		mask = oset.__bits[0];
+		mask = oset.__mask;
 		error = copyout(&mask, args->omask, sizeof(l_osigset_t));
 	}
 
@@ -353,7 +313,7 @@ linux_sgetmask(struct thread *td, struct linux_sgetmask_args *args)
 	PROC_LOCK(p);
 	bsd_to_linux_sigset(&td->td_sigmask, &mask);
 	PROC_UNLOCK(p);
-	td->td_retval[0] = mask.__bits[0];
+	td->td_retval[0] = mask.__mask;
 	return (0);
 }
 
@@ -371,9 +331,9 @@ linux_ssetmask(struct thread *td, struct linux_ssetmask_args *args)
 
 	PROC_LOCK(p);
 	bsd_to_linux_sigset(&td->td_sigmask, &lset);
-	td->td_retval[0] = lset.__bits[0];
+	td->td_retval[0] = lset.__mask;
 	LINUX_SIGEMPTYSET(lset);
-	lset.__bits[0] = args->mask;
+	lset.__mask = args->mask;
 	linux_to_bsd_sigset(&lset, &bset);
 	td->td_sigmask = bset;
 	SIG_CANTMASK(td->td_sigmask);
@@ -401,7 +361,7 @@ linux_sigpending(struct thread *td, struct linux_sigpending_args *args)
 	SIGSETAND(bset, td->td_sigmask);
 	PROC_UNLOCK(p);
 	bsd_to_linux_sigset(&bset, &lset);
-	mask = lset.__bits[0];
+	mask = lset.__mask;
 	return (copyout(&mask, args->mask, sizeof(mask)));
 }
 #endif /* __i386__ || (__amd64__ && COMPAT_LINUX32) */
@@ -505,7 +465,7 @@ linux_rt_sigtimedwait(struct thread *td,
 	if (error)
 		return (error);
 
-	sig = BSD_TO_LINUX_SIGNAL(info.ksi_signo);
+	sig = bsd_to_linux_signal(info.ksi_signo);
 
 	if (args->ptr) {
 		memset(&linfo, 0, sizeof(linfo));
@@ -537,10 +497,10 @@ linux_kill(struct thread *td, struct linux_kill_args *args)
 	if (!LINUX_SIG_VALID(args->signum) && args->signum != 0)
 		return (EINVAL);
 
-	if (args->signum > 0 && args->signum <= LINUX_SIGTBLSZ)
-		tmp.signum = linux_to_bsd_signal[_SIG_IDX(args->signum)];
+	if (args->signum > 0)
+		tmp.signum = linux_to_bsd_signal(args->signum);
 	else
-		tmp.signum = args->signum;
+		tmp.signum = 0;
 
 	tmp.pid = args->pid;
 	return (sys_kill(td, &tmp));
@@ -590,10 +550,10 @@ linux_tgkill(struct thread *td, struct linux_tgkill_args *args)
 	if (!LINUX_SIG_VALID(args->sig) && args->sig != 0)
 		return (EINVAL);
 
-	if (args->sig > 0 && args->sig <= LINUX_SIGTBLSZ)
-		sig = linux_to_bsd_signal[_SIG_IDX(args->sig)];
+	if (args->sig > 0)
+		sig = linux_to_bsd_signal(args->sig);
 	else
-		sig = args->sig;
+		sig = 0;
 
 	tdt = linux_tdfind(td, args->pid, args->tgid);
 	if (tdt == NULL)
@@ -628,8 +588,7 @@ linux_tkill(struct thread *td, struct linux_tkill_args *args)
 	if (!LINUX_SIG_VALID(args->sig))
 		return (EINVAL);
 
-
-	sig = BSD_TO_LINUX_SIGNAL(args->sig);
+	sig = linux_to_bsd_signal(args->sig);
 
 	tdt = linux_tdfind(td, args->tid, -1);
 	if (tdt == NULL)
@@ -727,9 +686,9 @@ siginfo_to_lsiginfo(const siginfo_t *si, l_siginfo_t *lsi, l_int sig)
 			lsi->lsi_uid = si->si_uid;
 
 			if (si->si_code == CLD_STOPPED)
-				lsi->lsi_status = BSD_TO_LINUX_SIGNAL(si->si_status);
+				lsi->lsi_status = bsd_to_linux_signal(si->si_status);
 			else if (si->si_code == CLD_CONTINUED)
-				lsi->lsi_status = BSD_TO_LINUX_SIGNAL(SIGCONT);
+				lsi->lsi_status = bsd_to_linux_signal(SIGCONT);
 			else
 				lsi->lsi_status = si->si_status;
 			break;
@@ -754,32 +713,6 @@ siginfo_to_lsiginfo(const siginfo_t *si, l_siginfo_t *lsi, l_int sig)
 	}
 }
 
-int
-linux_to_bsd_sigaltstack(int lsa)
-{
-	int bsa = 0;
-
-	if (lsa & LINUX_SS_DISABLE)
-		bsa |= SS_DISABLE;
-	/*
-	 * Linux ignores SS_ONSTACK flag for ss
-	 * parameter while FreeBSD prohibits it.
-	 */
-	return (bsa);
-}
-
-int
-bsd_to_linux_sigaltstack(int bsa)
-{
-	int lsa = 0;
-
-	if (bsa & SS_DISABLE)
-		lsa |= LINUX_SS_DISABLE;
-	if (bsa & SS_ONSTACK)
-		lsa |= LINUX_SS_ONSTACK;
-	return (lsa);
-}
-
 void
 lsiginfo_to_ksiginfo(const l_siginfo_t *lsi, ksiginfo_t *ksi, int sig)
 {
@@ -812,7 +745,7 @@ linux_rt_sigqueueinfo(struct thread *td, struct linux_rt_sigqueueinfo_args *args
 	if (linfo.lsi_code >= 0)
 		return (EPERM);
 
-	sig = BSD_TO_LINUX_SIGNAL(args->sig);
+	sig = linux_to_bsd_signal(args->sig);
 
 	error = ESRCH;
 	if ((p = pfind(args->pid)) != NULL ||
diff --git a/sys/compat/linux/linux_signal.h b/sys/compat/linux/linux_signal.h
index eb06bb0c90de..510bfb38397c 100644
--- a/sys/compat/linux/linux_signal.h
+++ b/sys/compat/linux/linux_signal.h
@@ -43,21 +43,9 @@
 #define	LINUX_SI_SIGIO		-5	/* sent by queued SIGIO */
 #define	LINUX_SI_TKILL		-6	/* sent by tkill system call */
 
-extern int bsd_to_linux_signal[];
-extern int linux_to_bsd_signal[];
-
-int linux_to_bsd_sigaltstack(int lsa);
-int bsd_to_linux_sigaltstack(int bsa);
-void linux_to_bsd_sigset(l_sigset_t *, sigset_t *);
-void bsd_to_linux_sigset(sigset_t *, l_sigset_t *);
 int linux_do_sigaction(struct thread *, int, l_sigaction_t *, l_sigaction_t *);
 void ksiginfo_to_lsiginfo(const ksiginfo_t *ksi, l_siginfo_t *lsi, l_int sig);
 void siginfo_to_lsiginfo(const siginfo_t *si, l_siginfo_t *lsi, l_int sig);
 void lsiginfo_to_ksiginfo(const l_siginfo_t *lsi, ksiginfo_t *ksi, int sig);
 
-#define LINUX_SIG_VALID(sig)	((sig) <= LINUX_NSIG && (sig) > 0)
-
-#define BSD_TO_LINUX_SIGNAL(sig)				\
-	(((sig) <= LINUX_SIGTBLSZ) ? bsd_to_linux_signal[_SIG_IDX(sig)] : sig)
-
 #endif /* _LINUX_SIGNAL_H_ */