diff --git a/scripts/bindgen.py b/scripts/bindgen.py
index 48baa0e..e04433a 100755
--- a/scripts/bindgen.py
+++ b/scripts/bindgen.py
@@ -115,9 +115,75 @@ for decl in data:
 	if gen_stub == False:
 		s += ';\n\n'
 	else:
-		s += '\n{\n\t'
+		s += '\n{\n'
+
+
+		# NOTE: check and cast arguments
 		retTag = decl['ret']['tag']
 
+		firstArgIndex = 0
+		if retTag != 'v':
+			firstArgIndex = 1
+
+		for argIndex, arg in enumerate(decl['args']):
+
+			argName = arg['name']
+			typeName = arg['type']['name']
+			typeCName = arg['type'].get('cname', typeName)
+			argTag = arg['type']['tag']
+
+			s += '\t'
+
+			if argTag == 'i':
+				s += typeCName + ' ' + argName + ' = *(i32*)&_sp[' + str(firstArgIndex + argIndex) + '];\n'
+			elif argTag == 'I':
+				s += typeCName + ' ' + argName + ' = *(i64*)&_sp[' + str(firstArgIndex + argIndex) + '];\n'
+			elif argTag == 'f':
+				s += typeCName + ' ' + argName + ' = *(f32*)&_sp[' + str(firstArgIndex + argIndex) + '];\n'
+			elif argTag == 'F':
+				s += typeCName + ' ' + argName + ' = *(f64*)&_sp[' + str(firstArgIndex + argIndex) + '];\n'
+			elif argTag == 'p':
+				s += typeCName + ' ' + argName + ' = ('+ typeCName +')((char*)_mem + *(i32*)&_sp[' + str(firstArgIndex + argIndex) + ']);\n'
+			elif argTag == 'S':
+				s += typeCName + ' ' + argName + ' = *('+ typeCName +'*)((char*)_mem + *(i32*)&_sp[' + str(firstArgIndex + argIndex) + ']);\n'
+			else:
+				print('unrecognized type ' + c + ' in procedure signature\n')
+				break
+
+		# check pointer arg length
+		for arg in decl['args']:
+
+			argName = arg['name']
+			typeName = arg['type']['name']
+			typeCName = arg['type'].get('cname', typeName)
+			argTag = arg['type']['tag']
+			argLen = arg.get('len')
+
+			if argTag == 'p' and argLen != None:
+
+				components =  argLen.get('components')
+				countArg = argLen.get('count')
+
+				s += '\tASSERT((char*)' + argName + ' + '
+
+				if components != None:
+					s += str(components)
+					if countArg != None:
+						s += '*'
+				if countArg != None:
+					s += countArg
+
+				if typeCName.startswith('void') == False and typeCName.startswith('const void') == False:
+					s += '*sizeof('+typeCName+')'
+
+				s += ' < ((char*)_mem + m3_GetMemorySize(runtime)));\n'
+
+		##############################################################################
+		#TODO: make sure return slot can contain return type
+		##############################################################################
+
+		s += '\t'
+
 		if retTag == 'i':
 			s += '*((i32*)&_sp[0]) = '
 		elif retTag == 'I':
@@ -133,29 +199,8 @@ for decl in data:
 
 		s += cname + '('
 
-		firstArgIndex = 0
-		if retTag != 'v':
-			firstArgIndex = 1
-
 		for i, arg in enumerate(decl['args']):
-			typeName = arg['type']['name']
-			typeCName = arg['type'].get('cname', typeName)
-			argTag = arg['type']['tag']
-			if argTag == 'i':
-				s += '*(i32*)&_sp[' + str(firstArgIndex + i) + ']'
-			elif argTag == 'I':
-				s += '*(i64*)&_sp[' + str(firstArgIndex + i) + ']'
-			elif argTag == 'f':
-				s += '*(f32*)&_sp[' + str(firstArgIndex + i) + ']'
-			elif argTag == 'F':
-				s += '*(f64*)&_sp[' + str(firstArgIndex + i) + ']'
-			elif argTag == 'p':
-				s += '(void*)((char*)_mem + *(i32*)&_sp[' + str(firstArgIndex + i) + '])'
-			elif argTag == 'S':
-				s += '*(' + typeCName + '*)((char*)_mem + *(i32*)&_sp[' + str(firstArgIndex + i) + '])'
-			else:
-				print('unrecognized type ' + c + ' in procedure signature\n')
-				break
+			s += arg['name']
 
 			if i+1 < len(decl['args']):
 				s += ', '
diff --git a/scripts/gles_gen.py b/scripts/gles_gen.py
index f4668de..0d45fa3 100644
--- a/scripts/gles_gen.py
+++ b/scripts/gles_gen.py
@@ -22,10 +22,13 @@ def gen_gles_header(spec, filename):
 	tree = et.parse(spec)
 	reg.loadElementTree(tree)
 
-	gen = COutputGenerator()
+	logFile = open('./gles_gen.log', 'w')
+	gen = COutputGenerator(diagFile=logFile)
 	reg.setGenerator(gen)
 	reg.apiGen(genOpts)
 
+	logFile.close()
+
 
 def get_bindgen_tag_for_type(typeName):
 	typeToTags = {
@@ -159,6 +162,9 @@ def gen_gles_bindgen_json(spec, filename):
 
 			typeName = typeName.strip()
 
+			if typeName.endswith('**'):
+				print("Warning: function " + name + ": parameter " + argName + " has 2 (or more) levels of indirection")
+
 			typeTag = get_bindgen_tag_for_type(typeName)
 
 			if typeTag == None: