1 files changed, 403 insertions, 0 deletions

diff --git a/sys/compat/linux/linux_signal.c b/sys/compat/linux/linux_signal.c
new file mode 100644
index 000000000000..82705b0b06c1
--- /dev/null
+++ b/sys/compat/linux/linux_signal.c
@@ -0,0 +1,403 @@
+/*-
+ * Copyright (c) 1994-1995 Søren Schmidt
+ * 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 
+ *    in this position and unchanged.
+ * 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. The name of the author may not be used to endorse or promote products
+ *    derived from this software withough specific prior written permission
+ *
+ * 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/sysproto.h>
+#include <sys/proc.h>
+#include <sys/signalvar.h>
+
+#include <machine/../linux/linux.h>
+#include <machine/../linux/linux_proto.h>
+#include <compat/linux/linux_signal.h>
+#include <compat/linux/linux_util.h>
+
+void
+linux_to_bsd_sigset(linux_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, linux_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);
+		}
+	}
+}
+
+static void
+linux_to_bsd_sigaction(linux_sigaction_t *lsa, struct sigaction *bsa)
+{
+
+	linux_to_bsd_sigset(&lsa->lsa_mask, &bsa->sa_mask);
+	bsa->sa_handler = lsa->lsa_handler;
+	bsa->sa_flags = 0;
+	if (lsa->lsa_flags & LINUX_SA_NOCLDSTOP)
+		bsa->sa_flags |= SA_NOCLDSTOP;
+	if (lsa->lsa_flags & LINUX_SA_NOCLDWAIT)
+		bsa->sa_flags |= SA_NOCLDWAIT;
+	if (lsa->lsa_flags & LINUX_SA_SIGINFO)
+		bsa->sa_flags |= SA_SIGINFO;
+	if (lsa->lsa_flags & LINUX_SA_ONSTACK)
+		bsa->sa_flags |= SA_ONSTACK;
+	if (lsa->lsa_flags & LINUX_SA_RESTART)
+		bsa->sa_flags |= SA_RESTART;
+	if (lsa->lsa_flags & LINUX_SA_ONESHOT)
+		bsa->sa_flags |= SA_RESETHAND;
+	if (lsa->lsa_flags & LINUX_SA_NOMASK)
+		bsa->sa_flags |= SA_NODEFER;
+}
+
+static void
+bsd_to_linux_sigaction(struct sigaction *bsa, linux_sigaction_t *lsa)
+{
+
+	bsd_to_linux_sigset(&bsa->sa_mask, &lsa->lsa_mask);
+	lsa->lsa_handler = bsa->sa_handler;
+	lsa->lsa_restorer = NULL;	/* unsupported */
+	lsa->lsa_flags = 0;
+	if (bsa->sa_flags & SA_NOCLDSTOP)
+		lsa->lsa_flags |= LINUX_SA_NOCLDSTOP;
+	if (bsa->sa_flags & SA_NOCLDWAIT)
+		lsa->lsa_flags |= LINUX_SA_NOCLDWAIT;
+	if (bsa->sa_flags & SA_SIGINFO)
+		lsa->lsa_flags |= LINUX_SA_SIGINFO;
+	if (bsa->sa_flags & SA_ONSTACK)
+		lsa->lsa_flags |= LINUX_SA_ONSTACK;
+	if (bsa->sa_flags & SA_RESTART)
+		lsa->lsa_flags |= LINUX_SA_RESTART;
+	if (bsa->sa_flags & SA_RESETHAND)
+		lsa->lsa_flags |= LINUX_SA_ONESHOT;
+	if (bsa->sa_flags & SA_NODEFER)
+		lsa->lsa_flags |= LINUX_SA_NOMASK;
+}
+
+int
+linux_do_sigaction(struct proc *p, int linux_sig, linux_sigaction_t *linux_nsa,
+		   linux_sigaction_t *linux_osa)
+{
+	struct sigaction *nsa, *osa;
+	struct sigaction_args sa_args;
+	int error;
+	caddr_t sg = stackgap_init();
+
+	if (linux_sig <= 0 || linux_sig > LINUX_NSIG)
+		return (EINVAL);
+
+	if (linux_osa != NULL)
+		osa = stackgap_alloc(&sg, sizeof(struct sigaction));
+	else
+		osa = NULL;
+
+	if (linux_nsa != NULL) {
+		nsa = stackgap_alloc(&sg, sizeof(struct sigaction));
+		linux_to_bsd_sigaction(linux_nsa, nsa);
+	}
+	else
+		nsa = NULL;
+
+	if (linux_sig <= LINUX_SIGTBLSZ)
+		sa_args.sig = linux_to_bsd_signal[_SIG_IDX(linux_sig)];
+	else
+		sa_args.sig = linux_sig;
+
+	sa_args.act = nsa;
+	sa_args.oact = osa;
+	error = sigaction(p, &sa_args);
+	if (error)
+		return (error);
+
+	if (linux_osa != NULL)
+		bsd_to_linux_sigaction(osa, linux_osa);
+
+	return (0);
+}
+
+int
+linux_signal(struct proc *p, struct linux_signal_args *args)
+{
+	linux_sigaction_t nsa, osa;
+	int error;
+
+#ifdef DEBUG
+	printf("Linux-emul(%ld): signal(%d, %p)\n",
+	       (long)p->p_pid, args->sig, (void *)args->handler);
+#endif
+
+	nsa.lsa_handler = args->handler;
+	nsa.lsa_flags = LINUX_SA_ONESHOT | LINUX_SA_NOMASK;
+	LINUX_SIGEMPTYSET(nsa.lsa_mask);
+
+	error = linux_do_sigaction(p, args->sig, &nsa, &osa);
+	p->p_retval[0] = (int)osa.lsa_handler;
+
+	return (error);
+}
+
+int
+linux_rt_sigaction(struct proc *p, struct linux_rt_sigaction_args *args)
+{
+	linux_sigaction_t nsa, osa;
+	int error;
+
+#ifdef DEBUG
+	printf("Linux-emul(%ld): rt_sigaction(%d, %p, %p, %d)\n",
+	       (long)p->p_pid, args->sig, (void *)args->act,
+	       (void *)args->oact, args->sigsetsize);
+#endif
+
+	if (args->sigsetsize != sizeof(linux_sigset_t))
+		return (EINVAL);
+
+	if (args->act != NULL) {
+		error = copyin(args->act, &nsa, sizeof(linux_sigaction_t));
+		if (error)
+			return (error);
+	}
+
+	error = linux_do_sigaction(p, args->sig,
+				   args->act ? &nsa : NULL,
+				   args->oact ? &osa : NULL);
+
+	if (args->oact != NULL && !error) {
+		error = copyout(&osa, args->oact, sizeof(linux_sigaction_t));
+	}
+
+	return (error);
+}
+
+static int
+linux_do_sigprocmask(struct proc *p, int how, linux_sigset_t *new,
+		     linux_sigset_t *old)
+{
+	int error, s;
+	sigset_t mask;
+
+	error = 0;
+	p->p_retval[0] = 0;
+
+	if (old != NULL)
+		bsd_to_linux_sigset(&p->p_sigmask, old);
+
+	if (new != NULL) {
+		linux_to_bsd_sigset(new, &mask);
+
+		s = splhigh();
+
+		switch (how) {
+		case LINUX_SIG_BLOCK:
+			SIGSETOR(p->p_sigmask, mask);
+			SIG_CANTMASK(p->p_sigmask);
+			break;
+		case LINUX_SIG_UNBLOCK:
+			SIGSETNAND(p->p_sigmask, mask);
+			break;
+		case LINUX_SIG_SETMASK:
+			p->p_sigmask = mask;
+			SIG_CANTMASK(p->p_sigmask);
+			break;
+		default:
+			error = EINVAL;
+			break;
+		}
+
+		splx(s);
+	}
+
+	return (error);
+}
+
+int
+linux_sigprocmask(struct proc *p, struct linux_sigprocmask_args *args)
+{
+	linux_osigset_t mask;
+	linux_sigset_t set, oset;
+	int error;
+
+#ifdef DEBUG
+	printf("Linux-emul(%d): sigprocmask(%d, *, *)\n", p->p_pid, args->how);
+#endif
+
+	if (args->mask != NULL) {
+		error = copyin(args->mask, &mask, sizeof(linux_osigset_t));
+		if (error)
+			return (error);
+		LINUX_SIGEMPTYSET(set);
+		set.__bits[0] = mask;
+	}
+
+	error = linux_do_sigprocmask(p, args->how,
+				     args->mask ? &set : NULL,
+				     args->omask ? &oset : NULL);
+
+	if (args->omask != NULL && !error) {
+		mask = oset.__bits[0];
+		error = copyout(&mask, args->omask, sizeof(linux_osigset_t));
+	}
+
+	return (error);
+}
+
+int
+linux_rt_sigprocmask(struct proc *p, struct linux_rt_sigprocmask_args *args)
+{
+	linux_sigset_t set, oset;
+	int error;
+
+#ifdef DEBUG
+	printf("Linux-emul(%ld): rt_sigprocmask(%d, %p, %p, %d)\n",
+	       (long)p->p_pid, args->how, (void *)args->mask,
+	       (void *)args->omask, args->sigsetsize);
+#endif
+
+	if (args->sigsetsize != sizeof(linux_sigset_t))
+		return EINVAL;
+
+	if (args->mask != NULL) {
+		error = copyin(args->mask, &set, sizeof(linux_sigset_t));
+		if (error)
+			return (error);
+	}
+
+	error = linux_do_sigprocmask(p, args->how,
+				     args->mask ? &set : NULL,
+				     args->omask ? &oset : NULL);
+
+	if (args->omask != NULL && !error) {
+		error = copyout(&oset, args->omask, sizeof(linux_sigset_t));
+	}
+
+	return (error);
+}
+
+int
+linux_siggetmask(struct proc *p, struct linux_siggetmask_args *args)
+{
+	linux_sigset_t mask;
+
+#ifdef DEBUG
+	printf("Linux-emul(%d): siggetmask()\n", p->p_pid);
+#endif
+
+	bsd_to_linux_sigset(&p->p_sigmask, &mask);
+	p->p_retval[0] = mask.__bits[0];
+	return (0);
+}
+
+int
+linux_sigsetmask(struct proc *p, struct linux_sigsetmask_args *args)
+{
+	linux_sigset_t lset;
+	sigset_t bset;
+	int s;
+
+#ifdef DEBUG
+	printf("Linux-emul(%ld): sigsetmask(%08lx)\n",
+	       (long)p->p_pid, (unsigned long)args->mask);
+#endif
+
+	bsd_to_linux_sigset(&p->p_sigmask, &lset);
+	p->p_retval[0] = lset.__bits[0];
+	LINUX_SIGEMPTYSET(lset);
+	lset.__bits[0] = args->mask;
+	linux_to_bsd_sigset(&lset, &bset);
+	s = splhigh();
+	p->p_sigmask = bset;
+	SIG_CANTMASK(p->p_sigmask);
+	splx(s);
+	return (0);
+}
+
+int
+linux_sigpending(struct proc *p, struct linux_sigpending_args *args)
+{
+	sigset_t bset;
+	linux_sigset_t lset;
+	linux_osigset_t mask;
+
+#ifdef DEBUG
+	printf("Linux-emul(%d): sigpending(*)\n", p->p_pid);
+#endif
+
+	bset = p->p_siglist;
+	SIGSETAND(bset, p->p_sigmask);
+	bsd_to_linux_sigset(&bset, &lset);
+	mask = lset.__bits[0];
+	return (copyout(&mask, args->mask, sizeof(mask)));
+}
+
+int
+linux_kill(struct proc *p, struct linux_kill_args *args)
+{
+	struct kill_args /* {
+	    int pid;
+	    int signum;
+	} */ tmp;
+
+#ifdef DEBUG
+	printf("Linux-emul(%d): kill(%d, %d)\n",
+	       p->p_pid, args->pid, args->signum);
+#endif
+
+	/*
+	 * Allow signal 0 as a means to check for privileges
+	 */
+	if (args->signum < 0 || args->signum > LINUX_NSIG)
+		return EINVAL;
+
+	if (args->signum > 0 && args->signum <= LINUX_SIGTBLSZ)
+		tmp.signum = linux_to_bsd_signal[_SIG_IDX(args->signum)];
+	else
+		tmp.signum = args->signum;
+
+	tmp.pid = args->pid;
+	return (kill(p, &tmp));
+}