Unify Assembler files between Linux and Windows

Add new macro ASMABI used by Windows to change
calling API to "sysv_abi".

Reviewed-by: Attila Fülöp <attila@fueloep.org>
Reviewed-by: Richard Yao <richard.yao@alumni.stonybrook.edu>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Jorgen Lundman <lundman@lundman.net>
Closes #14228

include/os/freebsd/Makefile.am

@@ -6,6 +6,8 @@ noinst_HEADERS = \
 	\
 	%D%/spl/rpc/xdr.h \
 	\
+	%D%/spl/sys/ia32/asm_linkage.h \
+	\
 	%D%/spl/sys/acl.h \
 	%D%/spl/sys/acl_impl.h \
 	%D%/spl/sys/atomic.h \
@@ -88,3 +90,4 @@ noinst_HEADERS = \
 	%D%/zfs/sys/zfs_vnops_os.h \
 	%D%/zfs/sys/zfs_znode_impl.h \
 	%D%/zfs/sys/zpl.h
+

include/os/freebsd/spl/sys/ia32/asm_linkage.h

@@ -0,0 +1,178 @@
+/*
+ * 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 https://opensource.org/licenses/CDDL-1.0.
+ * 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 2008 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _IA32_SYS_ASM_LINKAGE_H
+#define	_IA32_SYS_ASM_LINKAGE_H
+
+#define	RET	ret
+
+/* Tell compiler to call assembler like Unix */
+#undef ASMABI
+#define	ASMABI	__attribute__((sysv_abi))
+
+#define	ENDBR
+
+#define	SECTION_TEXT .text
+#define	SECTION_STATIC .data
+
+#ifdef	__cplusplus
+extern "C" {
+#endif
+
+#ifdef _ASM	/* The remainder of this file is only for assembly files */
+
+
+/*
+ * make annoying differences in assembler syntax go away
+ */
+
+/*
+ * D16 and A16 are used to insert instructions prefixes; the
+ * macros help the assembler code be slightly more portable.
+ */
+#if !defined(__GNUC_AS__)
+/*
+ * /usr/ccs/bin/as prefixes are parsed as separate instructions
+ */
+#define	D16	data16;
+#define	A16	addr16;
+
+/*
+ * (There are some weird constructs in constant expressions)
+ */
+#define	_CONST(const)		[const]
+#define	_BITNOT(const)		-1!_CONST(const)
+#define	_MUL(a, b)		_CONST(a \* b)
+
+#else
+/*
+ * Why not use the 'data16' and 'addr16' prefixes .. well, the
+ * assembler doesn't quite believe in real mode, and thus argues with
+ * us about what we're trying to do.
+ */
+#define	D16	.byte	0x66;
+#define	A16	.byte	0x67;
+
+#define	_CONST(const)		(const)
+#define	_BITNOT(const)		~_CONST(const)
+#define	_MUL(a, b)		_CONST(a * b)
+
+#endif
+
+/*
+ * C pointers are different sizes between i386 and amd64.
+ * These constants can be used to compute offsets into pointer arrays.
+ */
+#if defined(__amd64)
+#define	CLONGSHIFT	3
+#define	CLONGSIZE	8
+#define	CLONGMASK	7
+#elif defined(__i386)
+#define	CLONGSHIFT	2
+#define	CLONGSIZE	4
+#define	CLONGMASK	3
+#endif
+
+/*
+ * Since we know we're either ILP32 or LP64 ..
+ */
+#define	CPTRSHIFT	CLONGSHIFT
+#define	CPTRSIZE	CLONGSIZE
+#define	CPTRMASK	CLONGMASK
+
+#if CPTRSIZE != (1 << CPTRSHIFT) || CLONGSIZE != (1 << CLONGSHIFT)
+#error	"inconsistent shift constants"
+#endif
+
+#if CPTRMASK != (CPTRSIZE - 1) || CLONGMASK != (CLONGSIZE - 1)
+#error	"inconsistent mask constants"
+#endif
+
+#define	ASM_ENTRY_ALIGN	16
+
+/*
+ * SSE register alignment and save areas
+ */
+
+#define	XMM_SIZE	16
+#define	XMM_ALIGN	16
+
+/*
+ * ENTRY provides the standard procedure entry code and an easy way to
+ * insert the calls to mcount for profiling. ENTRY_NP is identical, but
+ * never calls mcount.
+ */
+#define	ENTRY(x) \
+	.text; \
+	.align	ASM_ENTRY_ALIGN; \
+	.globl	x; \
+x:	MCOUNT(x)
+
+#define	ENTRY_NP(x) \
+	.text; \
+	.align	ASM_ENTRY_ALIGN; \
+	.globl	x; \
+x:
+
+#define	ENTRY_ALIGN(x, a) \
+	.text; \
+	.align	a; \
+	.globl	x; \
+x:
+
+/*
+ * ENTRY2 is identical to ENTRY but provides two labels for the entry point.
+ */
+#define	ENTRY2(x, y) \
+	.text;	\
+	.align	ASM_ENTRY_ALIGN; \
+	.globl	x, y; \
+x:; \
+y:	MCOUNT(x)
+
+#define	ENTRY_NP2(x, y) \
+	.text; \
+	.align	ASM_ENTRY_ALIGN; \
+	.globl	x, y; \
+x:; \
+y:
+
+
+/*
+ * SET_SIZE trails a function and set the size for the ELF symbol table.
+ */
+#define	SET_SIZE(x)
+
+#define	SET_OBJ(x)
+
+
+#endif /* _ASM */
+
+#ifdef	__cplusplus
+}
+#endif
+
+#endif	/* _IA32_SYS_ASM_LINKAGE_H */