OpenZFS 7431 - ZFS Channel Programs

Authored by: Chris Williamson <chris.williamson@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: John Kennedy <john.kennedy@delphix.com>
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Approved by: Garrett D'Amore <garrett@damore.org>
Ported-by: Don Brady <don.brady@delphix.com>
Ported-by: John Kennedy <john.kennedy@delphix.com>

OpenZFS-issue: https://www.illumos.org/issues/7431
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/dfc11533

Porting Notes:
* The CLI long option arguments for '-t' and '-m' don't parse on linux
* Switched from kmem_alloc to vmem_alloc in zcp_lua_alloc
* Lua implementation is built as its own module (zlua.ko)
* Lua headers consumed directly by zfs code moved to 'include/sys/lua/'
* There is no native setjmp/longjump available in stock Linux kernel.
  Brought over implementations from illumos and FreeBSD
* The get_temporary_prop() was adapted due to VFS platform differences
* Use of inline functions in lua parser to reduce stack usage per C call
* Skip some ZFS Test Suite ZCP tests on sparc64 to avoid stack overflow

module/lua/setjmp/setjmp_i386.S

@@ -0,0 +1,69 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+/*
+ * Copyright (c) 1992, 2010, Oracle and/or its affiliates. All rights reserved.
+ */
+
+#define	ENTRY(x) \
+	.text; \
+	.align	8; \
+	.globl	x; \
+	.type	x, @function; \
+x:
+
+#define	SET_SIZE(x) \
+	.size	x, [.-x]
+
+/*
+ * Setjmp and longjmp implement non-local gotos using state vectors
+ * type label_t.
+ */
+#ifdef __i386__
+
+	ENTRY(setjmp)			/* save area is passed in eax */
+	movl	%ebp, 0(%eax)		/* save ebp */
+	movl	%ebx, 4(%eax)		/* save ebx */
+	movl	%esi, 8(%eax)		/* save esi */
+	movl	%edi, 12(%eax)		/* save edi */
+	movl	%esp, 16(%eax)		/* save esp */
+	movl	(%esp), %ecx		/* %eip (return address) */
+	movl	%ecx, 20(%eax)		/* save eip */
+	subl	%eax, %eax		/* return 0 */
+	ret
+	SET_SIZE(setjmp)
+
+	ENTRY(longjmp)			/* save area is passed in eax */
+	movl	0(%eax), %ebp		/* restore ebp */
+	movl	4(%eax), %ebx		/* restore ebx */
+	movl	8(%eax), %esi		/* restore esi */
+	movl	12(%eax), %edi		/* restore edi */
+	movl	16(%eax), %esp		/* restore esp */
+	movl	20(%eax), %ecx		/* %eip (return address) */
+	addl	$4, %esp		/* pop ret adr */
+	jmp	*%ecx			/* indirect jump */
+	SET_SIZE(longjmp)
+
+#ifdef __ELF__
+.section .note.GNU-stack,"",%progbits
+#endif
+
+#endif /* __i386__ */