NMI Support Patch 8:

[NTOS]: Implement a GNU Assembler version of the Windows SDK ASM calling convention macros. Only stdCall and its helpers have been written -- feel free to write the rest. Based on callconv.inc from Microsoft). SUGGESTION: Slowly start rewriting current code to use calling convention macros as it is much cleaner.


svn path=/trunk/; revision=44868

reactos/ntoskrnl/include/internal/i386/callconv.s

@@ -0,0 +1,100 @@
+/*
+ * PROJECT:         ReactOS Source Development Kit (SDK)
+ * LICENSE:         BSD - See COPYING.ARM in the top level directory
+ * FILE:            include/ddk/api/callconv.s
+ * PURPOSE:         x86 Calling Convention Helpers
+ * PROGRAMMERS:     ReactOS Portable Systems Group
+ */
+
+/* INCLUDES *******************************************************************/
+
+//
+// @name CountArg
+// 
+// This macro counts the number of arguments in the ArgList and returns
+// the value in cCount.
+//
+// @param cCount - Count of arguments
+// @param ArgList - Argument list
+//
+// @remark None.
+//
+.macro CountArg cCount:req,ArgList:vararg
+
+	cCount = 0
+
+    .irp arg, \ArgList
+		cCount = cCount+1
+	.endr
+
+.endm
+
+//
+// @name RevPush
+// 
+// This macro pushes the arguments in ArgList in the reverse order
+// and returns the number of arguments in cCount
+//
+// @param cCount - Count of arguments
+// @param ArgList - Argument list
+//
+// @remark None.
+//
+.macro RevPush cCount:req,ArgList:vararg
+	LOCAL index, x
+
+	CountArg cCount, ArgList
+
+	index = cCount
+	.rept cCount
+		x = 0
+		.irp arg,ArgList
+			x=x+1
+			.ifeq index-x
+				push arg
+				.exitm
+			.endif
+		.endr
+
+		index = index-1
+	.endr
+.endm
+
+//
+// @name stdCallCall
+// 
+// This macro performs a function call using the STDCALL convention and applies
+// the correct name decoration required based on the stack bytes
+//
+// @param Func - Function name
+// @param N - Number of stack bytes for arguments
+//
+// @remark None.
+//
+.macro stdCallCall Func:req,N:req
+	.ifdef __imp_&Func&@&N
+    	call dword ptr [__imp_&Func&@&N]
+	.else
+    	call Func&@&N
+	.endif
+.endm
+
+//
+// @name stdCall
+// 
+// This macro pushes the arguments required for a function call using the
+// STDCALL convention and then issues the call
+//
+// @param Func - Function name
+// @param ArgList - Argument list
+//
+// @remark None.
+//
+.macro stdCall Func:req,ArgList:vararg
+	LOCAL Bytes
+
+	RevPush Bytes,ArgList
+	Bytes = Bytes*4
+
+	stdCallCall Func, %(Bytes)
+.endm