Add some new files needed for linux 2.6.x compatibility.

Please don't style(9) the NetBSD code, we want to stay in sync. Not imported
on a vendor branch since we need local changes.

Sponsored by:	Google SoC 2006
Submitted by:	rdivacky
With help from:	manu@NetBSD.org
Obtained from:	NetBSD (linux_{futex,time}.*)

1 files changed, 500 insertions, 0 deletions

diff --git a/sys/compat/linux/linux_futex.c b/sys/compat/linux/linux_futex.c
new file mode 100644
index 000000000000..889d29d6d485
--- /dev/null
+++ b/sys/compat/linux/linux_futex.c
@@ -0,0 +1,500 @@
+/*	$NetBSD: linux_futex.c,v 1.5 2005/11/23 16:14:57 manu Exp $ */
+
+/*-
+ * Copyright (c) 2005 Emmanuel Dreyfus, 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.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by Emmanuel Dreyfus
+ * 4. The name of the author may not be used to endorse or promote 
+ *    products derived from this software without specific prior written 
+ *    permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE 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("$FreeBSD$");
+#if 0
+ __KERNEL_RCSID(1, "$NetBSD: linux_futex.c,v 1.5 2005/11/23 16:14:57 manu Exp $");
+#endif
+
+#include "opt_compat.h"
+
+#include <sys/param.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/systm.h>
+#include <sys/proc.h>
+#include <sys/queue.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <sys/malloc.h>
+
+#ifdef COMPAT_LINUX32
+#include <machine/../linux32/linux.h>
+#include <machine/../linux32/linux32_proto.h>
+#else
+#include <machine/../linux/linux.h>
+#include <machine/../linux/linux_proto.h>
+#endif
+#include <compat/linux/linux_futex.h>
+
+struct futex;
+
+struct waiting_proc {
+	struct thread *wp_t;
+	struct futex *wp_new_futex;
+	TAILQ_ENTRY(waiting_proc) wp_list;
+};
+struct futex {
+	void *f_uaddr;
+	int f_refcount;
+	LIST_ENTRY(futex) f_list;
+	TAILQ_HEAD(lf_waiting_proc, waiting_proc) f_waiting_proc;
+};
+
+LIST_HEAD(futex_list, futex) futex_list;
+struct mtx futex_mtx;		/* this protects the LIST of futexes */
+
+#define FUTEX_LOCK mtx_lock(&futex_mtx)
+#define FUTEX_UNLOCK mtx_unlock(&futex_mtx)
+
+#define FUTEX_LOCKED	1
+#define FUTEX_UNLOCKED	0
+
+#define FUTEX_SYSTEM_LOCK mtx_lock(&Giant)
+#define FUTEX_SYSTEM_UNLOCK mtx_unlock(&Giant)
+
+static struct futex *futex_get(void *, int);
+static void futex_put(struct futex *);
+static int futex_sleep(struct futex *, struct thread *, unsigned long);
+static int futex_wake(struct futex *, int, struct futex *);
+#ifdef __i386__
+static int futex_atomic_op(struct thread *td, int encoded_op, caddr_t uaddr);
+#endif 
+
+/* support.s */
+int futex_xchgl(int oparg, caddr_t uaddr, int *oldval);
+int futex_addl(int oparg, caddr_t uaddr, int *oldval);
+int futex_orl(int oparg, caddr_t uaddr, int *oldval);
+int futex_andnl(int oparg, caddr_t uaddr, int *oldval);
+int futex_xorl(int oparg, caddr_t uaddr, int *oldval);
+
+int
+linux_sys_futex(struct thread *td, struct linux_sys_futex_args *args)
+{
+	int val;
+	int ret;
+	struct l_timespec timeout = { 0, 0 };
+	int error = 0;
+	struct futex *f;
+	struct futex *newf;
+	int timeout_hz;
+	struct timeval tv = {0, 0};
+#ifdef __i386__
+	struct futex *f2;
+	int op_ret;
+#endif
+
+#ifdef	DEBUG
+	if (ldebug(sys_futex))
+	   	printf(ARGS(futex,"%p, %i, %i"), args->uaddr, args->op, args->val);
+#endif
+
+	switch (args->op) {
+	case LINUX_FUTEX_WAIT:
+	   	FUTEX_SYSTEM_LOCK;
+
+		if ((error = copyin(args->uaddr, 
+		    &val, sizeof(val))) != 0) {
+		   	FUTEX_SYSTEM_UNLOCK;
+			return error;
+		}
+
+		if (val != args->val) {
+		   	FUTEX_SYSTEM_UNLOCK;
+			return EWOULDBLOCK;
+		}
+
+		if (args->timeout != NULL) {
+			if ((error = copyin(args->timeout, 
+			    &timeout, sizeof(timeout))) != 0) {
+			  	FUTEX_SYSTEM_UNLOCK;
+				return error;
+			}
+		}
+
+#ifdef DEBUG
+		if (ldebug(sys_futex))
+   			printf("FUTEX_WAIT %d: val = %d, uaddr = %p, "
+		    		"*uaddr = %d, timeout = %d.%09ld\n", 
+		    		td->td_proc->p_pid, args->val, 
+		    		args->uaddr, val, timeout.tv_sec, timeout.tv_nsec); 
+#endif
+		tv.tv_usec = timeout.tv_sec * 1000000 + timeout.tv_nsec / 1000;
+		timeout_hz = tvtohz(&tv);
+
+		if (timeout.tv_sec == 0 && timeout.tv_nsec == 0)
+		   	timeout_hz = 0;
+      		/*
+                 * If the user process requests a non null timeout,
+                 * make sure we do not turn it into an infinite
+                 * timeout because timeout_hz gets null.
+                 *
+                 * We use a minimal timeout of 1/hz. Maybe it would
+                 * make sense to just return ETIMEDOUT without sleeping.
+                 */
+                if (((timeout.tv_sec != 0) || (timeout.tv_nsec != 0)) &&
+                    (timeout_hz == 0))
+                        timeout_hz = 1;
+
+
+		f = futex_get(args->uaddr, FUTEX_UNLOCKED);
+		ret = futex_sleep(f, td, timeout_hz);
+		futex_put(f);
+
+#ifdef DEBUG
+		if (ldebug(sys_futex))
+   			printf("FUTEX_WAIT %d: uaddr = %p, "
+		    		"ret = %d\n", td->td_proc->p_pid, args->uaddr, ret); 
+#endif
+
+		FUTEX_SYSTEM_UNLOCK;
+		switch (ret) {
+		case EWOULDBLOCK:	/* timeout */
+			return ETIMEDOUT;
+			break;
+		case EINTR:		/* signal */
+			return EINTR;
+			break;
+		case 0:			/* FUTEX_WAKE received */
+#ifdef DEBUG
+			if (ldebug(sys_futex))
+				printf("FUTEX_WAIT %d: uaddr = %p, got FUTEX_WAKE\n",
+			    		td->td_proc->p_pid, args->uaddr); 
+#endif
+			return 0;
+			break;
+		default:
+#ifdef DEBUG
+			if (ldebug(sys_futex))
+   				printf("FUTEX_WAIT: unexpected ret = %d\n", ret);
+#endif
+			break;
+		}
+
+		/* NOTREACHED */
+		break;
+		
+	case LINUX_FUTEX_WAKE:
+		FUTEX_SYSTEM_LOCK;
+
+		/* 
+		 * XXX: Linux is able cope with different addresses 
+		 * corresponding to the same mapped memory in the sleeping 
+		 * and the waker process.
+		 */
+#ifdef DEBUG
+		if (ldebug(sys_futex))
+   			printf("FUTEX_WAKE %d: uaddr = %p, val = %d\n", 
+		   		 td->td_proc->p_pid, args->uaddr, args->val); 
+#endif
+		f = futex_get(args->uaddr, FUTEX_UNLOCKED);
+		td->td_retval[0] = futex_wake(f, args->val, NULL);
+		futex_put(f);
+
+		FUTEX_SYSTEM_UNLOCK;
+		break;
+
+	case LINUX_FUTEX_CMP_REQUEUE:
+		FUTEX_SYSTEM_LOCK;
+
+		if ((error = copyin(args->uaddr, 
+		    &val, sizeof(val))) != 0) {
+		   	FUTEX_SYSTEM_UNLOCK;
+			return error;
+		}
+
+		if (val != args->val3) {
+		   	FUTEX_SYSTEM_UNLOCK;
+			return EAGAIN;
+		}
+
+		f = futex_get(args->uaddr, FUTEX_UNLOCKED);
+		newf = futex_get(args->uaddr2, FUTEX_UNLOCKED);
+		td->td_retval[0] = futex_wake(f, args->val, newf);
+		futex_put(f);
+		futex_put(newf);
+
+		FUTEX_SYSTEM_UNLOCK;
+		break;
+
+	case LINUX_FUTEX_REQUEUE:
+		FUTEX_SYSTEM_LOCK;
+		
+		f = futex_get(args->uaddr, FUTEX_UNLOCKED);
+		newf = futex_get(args->uaddr2, FUTEX_UNLOCKED);
+		td->td_retval[0] = futex_wake(f, args->val, newf);
+		futex_put(f);
+		futex_put(newf);
+		
+		FUTEX_SYSTEM_UNLOCK;
+		break;
+
+	case LINUX_FUTEX_FD:
+		printf("linux_sys_futex: unimplemented op %d\n", 
+		    args->op);
+		break;
+
+	case LINUX_FUTEX_WAKE_OP:
+#ifdef	__i386__
+		FUTEX_SYSTEM_LOCK;
+#ifdef DEBUG
+		if (ldebug(sys_futex))
+   		   	printf("FUTEX_WAKE_OP: %d: uaddr = %p, op = %d, val = %d, uaddr2 = %p, val3 = %d\n",
+		      		td->td_proc->p_pid, args->uaddr, args->op, args->val, args->uaddr2, args->val3);
+#endif
+		f = futex_get(args->uaddr, FUTEX_UNLOCKED);
+		f2 = futex_get(args->uaddr2, FUTEX_UNLOCKED);
+
+		/* This function returns positive number as results
+		 * and negative as errors
+		 */
+		op_ret = futex_atomic_op(td, args->val3, args->uaddr2);
+		if (op_ret < 0) {
+
+		   	/* XXX: we dont handle the EFAULT yet */
+		   	if (op_ret != -EFAULT) {
+			   	futex_put(f);
+			   	futex_put(f2);
+				FUTEX_SYSTEM_UNLOCK;
+			   	return (-op_ret);
+			}
+
+			futex_put(f);
+			futex_put(f2);
+
+		   	FUTEX_SYSTEM_UNLOCK;
+			return (EFAULT);
+
+		}
+
+		ret = futex_wake(f, args->val, NULL);
+		futex_put(f);
+		if (op_ret > 0) {
+		   	printf("second wakeup\n");
+		   	op_ret = 0;
+		   	/* Linux always puts there 0 retries */
+   		   	op_ret += futex_wake(f2, 0, NULL);
+			ret += op_ret;
+		}
+		futex_put(f2);
+		td->td_retval[0] = ret;
+
+		FUTEX_SYSTEM_UNLOCK;
+#else
+		printf("linux_sys_futex: wake_op not implemented");
+#endif
+	   	break;
+
+	default:
+		printf("linux_sys_futex: unknown op %d\n", 
+		    args->op);
+		break;
+	}
+	return 0;
+}
+
+static struct futex *
+futex_get(void *uaddr, int locked)
+{
+	struct futex *f;
+
+	if (locked == FUTEX_UNLOCKED)
+   	   	FUTEX_LOCK;
+	LIST_FOREACH(f, &futex_list, f_list) {
+		if (f->f_uaddr == uaddr) {
+			f->f_refcount++;
+			if (locked == FUTEX_UNLOCKED)
+   			   	FUTEX_UNLOCK;
+			return f;
+		}
+	}
+	if (locked == FUTEX_UNLOCKED)
+   	   	FUTEX_UNLOCK;
+
+	/* Not found, create it */
+	f = malloc(sizeof(*f), M_LINUX, M_WAITOK);
+	f->f_uaddr = uaddr;
+	f->f_refcount = 1;
+	TAILQ_INIT(&f->f_waiting_proc);
+	if (locked == FUTEX_UNLOCKED)
+   	   	FUTEX_LOCK;
+	LIST_INSERT_HEAD(&futex_list, f, f_list);
+	if (locked == FUTEX_UNLOCKED)
+   	   	FUTEX_UNLOCK;
+
+	return f;
+}
+
+static void 
+futex_put(f)
+	struct futex *f;
+{
+   	FUTEX_LOCK;
+   	f->f_refcount--;
+	if (f->f_refcount == 0) {
+		LIST_REMOVE(f, f_list);
+		free(f, M_LINUX);
+	}
+	FUTEX_UNLOCK;
+
+	return;
+}
+
+static int 
+futex_sleep(struct futex *f, struct thread *td, unsigned long timeout)
+{
+	struct waiting_proc *wp;
+	int ret;
+
+	wp = malloc(sizeof(*wp), M_LINUX, M_WAITOK);
+	wp->wp_t = td;
+	wp->wp_new_futex = NULL;
+	FUTEX_LOCK;
+	TAILQ_INSERT_TAIL(&f->f_waiting_proc, wp, wp_list);
+	FUTEX_UNLOCK;
+
+#ifdef DEBUG
+	if (ldebug(sys_futex))
+   		printf("FUTEX --> %d tlseep timeout = %ld\n", td->td_proc->p_pid,
+	  	      timeout);
+#endif
+	ret = tsleep(wp, PCATCH|PZERO, "linuxfutex", timeout);
+
+	FUTEX_LOCK;
+	TAILQ_REMOVE(&f->f_waiting_proc, wp, wp_list);
+	FUTEX_UNLOCK;
+
+	if ((ret == 0) && (wp->wp_new_futex != NULL)) {
+		ret = futex_sleep(wp->wp_new_futex, td, timeout);
+		futex_put(wp->wp_new_futex); /* futex_get called in wakeup */
+	}
+
+	free(wp, M_LINUX);
+
+	return ret;
+}
+
+static int
+futex_wake(struct futex *f, int n, struct futex *newf)
+{
+	struct waiting_proc *wp;
+	int count = 0; 
+
+	FUTEX_LOCK;
+	TAILQ_FOREACH(wp, &f->f_waiting_proc, wp_list) {
+		if (count <= n) {
+			wakeup(wp);
+			count++;
+		} else {
+			if (newf != NULL) {
+				/* futex_put called after tsleep */
+				wp->wp_new_futex = futex_get(newf->f_uaddr, FUTEX_LOCKED);
+				wakeup(wp);
+			}
+		}
+	}
+	FUTEX_UNLOCK;
+
+	return count;
+}
+
+#ifdef __i386__
+static int
+futex_atomic_op(struct thread *td, int encoded_op, caddr_t uaddr)
+{
+   	int op = (encoded_op >> 28) & 7;
+        int cmp = (encoded_op >> 24) & 15;
+        int oparg = (encoded_op << 8) >> 20;
+        int cmparg = (encoded_op << 20) >> 20;
+        int oldval = 0, ret;
+
+	if (encoded_op & (FUTEX_OP_OPARG_SHIFT << 28))
+	   	oparg = 1 << oparg;
+
+#ifdef DEBUG	
+	printf("futex_atomic_op: op = %d, cmp = %d, oparg = %d, cmparg = %d, uaddr = %p\n",
+	      op, cmp, oparg, cmparg, uaddr);
+#endif
+	/* XXX: linux verifies access here and returns EFAULT */
+
+	critical_enter();
+
+	switch (op) {
+	   	case FUTEX_OP_SET:
+		   	ret = futex_xchgl(oparg, uaddr, &oldval);
+			break;
+		case FUTEX_OP_ADD:
+			ret = futex_addl(oparg, uaddr, &oldval);
+			break;
+		case FUTEX_OP_OR:
+			ret = futex_orl(oparg, uaddr, &oldval);
+			break;
+		case FUTEX_OP_ANDN:
+			ret = futex_andnl(oparg, uaddr, &oldval);
+			break;
+		case FUTEX_OP_XOR:
+			ret = futex_xorl(oparg, uaddr, &oldval);
+			break;
+		default:
+			ret = -ENOSYS;
+	}
+
+	critical_exit();
+
+	if (!ret)
+	   	switch (cmp) {
+		      case FUTEX_OP_CMP_EQ: 
+			 	ret = (oldval == cmparg); 
+				break;
+		      case FUTEX_OP_CMP_NE: 
+				ret = (oldval != cmparg); 
+				break;
+		      case FUTEX_OP_CMP_LT: 
+				ret = (oldval < cmparg); 
+				break;
+		      case FUTEX_OP_CMP_GE: 
+				ret = (oldval >= cmparg); 
+				break;
+		      case FUTEX_OP_CMP_LE: 
+				ret = (oldval <= cmparg); 
+				break;
+		      case FUTEX_OP_CMP_GT: 
+				ret = (oldval > cmparg); 
+				break;
+		      default: ret = -ENOSYS;
+		}
+
+	return (ret);
+}
+#endif