[bfin] hookize FUNCTION_ARG &co.

diff --git a/gcc/config/bfin/bfin-protos.h b/gcc/config/bfin/bfin-protos.h
index 4a9b7a1..e4c2665 100644
--- a/gcc/config/bfin/bfin-protos.h
+++ b/gcc/config/bfin/bfin-protos.h
@@ -65,8 +65,6 @@ 
 
 #define Mmode enum machine_mode
 
-extern rtx function_arg (CUMULATIVE_ARGS *, Mmode, tree, int);
-extern void function_arg_advance (CUMULATIVE_ARGS *, Mmode, tree, int);
 extern bool function_arg_regno_p (int);
 
 extern const char *output_load_immediate (rtx *);
diff --git a/gcc/config/bfin/bfin.c b/gcc/config/bfin/bfin.c
index d0a1396..87861fb 100644
--- a/gcc/config/bfin/bfin.c
+++ b/gcc/config/bfin/bfin.c
@@ -1907,9 +1907,9 @@  init_cumulative_args (CUMULATIVE_ARGS *cum, tree fntype,
    of mode MODE and data type TYPE.
    (TYPE is null for libcalls where that information may not be available.)  */
 
-void
-function_arg_advance (CUMULATIVE_ARGS *cum, enum machine_mode mode, tree type,
-		      int named ATTRIBUTE_UNUSED)
+static void
+bfin_function_arg_advance (CUMULATIVE_ARGS *cum, enum machine_mode mode,
+			   const_tree type, bool named ATTRIBUTE_UNUSED)
 {
   int count, bytes, words;
 
@@ -1946,9 +1946,9 @@  function_arg_advance (CUMULATIVE_ARGS *cum, enum machine_mode mode, tree type,
    NAMED is nonzero if this argument is a named parameter
     (otherwise it is an extra parameter matching an ellipsis).  */
 
-struct rtx_def *
-function_arg (CUMULATIVE_ARGS *cum, enum machine_mode mode, tree type,
-	      int named ATTRIBUTE_UNUSED)
+static rtx
+bfin_function_arg (CUMULATIVE_ARGS *cum, enum machine_mode mode,
+		   const_tree type, bool named ATTRIBUTE_UNUSED)
 {
   int bytes
     = (mode == BLKmode) ? int_size_in_bytes (type) : GET_MODE_SIZE (mode);
@@ -6611,6 +6611,12 @@  bfin_expand_builtin (tree exp, rtx target ATTRIBUTE_UNUSED,
 #undef TARGET_ARG_PARTIAL_BYTES
 #define TARGET_ARG_PARTIAL_BYTES bfin_arg_partial_bytes
 
+#undef TARGET_FUNCTION_ARG
+#define TARGET_FUNCTION_ARG bfin_function_arg
+
+#undef TARGET_FUNCTION_ARG_ADVANCE
+#define TARGET_FUNCTION_ARG_ADVANCE bfin_function_arg_advance
+
 #undef TARGET_PASS_BY_REFERENCE
 #define TARGET_PASS_BY_REFERENCE bfin_pass_by_reference
 
diff --git a/gcc/config/bfin/bfin.h b/gcc/config/bfin/bfin.h
index e6e2aae..5d1aca0 100644
--- a/gcc/config/bfin/bfin.h
+++ b/gcc/config/bfin/bfin.h
@@ -839,22 +839,6 @@  typedef struct {
   int call_cookie;		/* Do special things for this call */
 } CUMULATIVE_ARGS;
 
-/* Define where to put the arguments to a function.
-   Value is zero to push the argument on the stack,
-   or a hard register in which to store the argument.
-
-   MODE is the argument's machine mode.
-   TYPE is the data type of the argument (as a tree).
-    This is null for libcalls where that information may
-    not be available.
-   CUM is a variable of type CUMULATIVE_ARGS which gives info about
-    the preceding args and about the function being called.
-   NAMED is nonzero if this argument is a named parameter
-    (otherwise it is an extra parameter matching an ellipsis).  */
-
-#define FUNCTION_ARG(CUM, MODE, TYPE, NAMED) \
-  (function_arg (&CUM, MODE, TYPE, NAMED))
-
 #define FUNCTION_ARG_REGNO_P(REGNO) function_arg_regno_p (REGNO)
 
 
@@ -864,12 +848,6 @@  typedef struct {
 #define INIT_CUMULATIVE_ARGS(CUM,FNTYPE,LIBNAME,INDIRECT, N_NAMED_ARGS)	\
   (init_cumulative_args (&CUM, FNTYPE, LIBNAME))
 
-/* Update the data in CUM to advance over an argument
-   of mode MODE and data type TYPE.
-   (TYPE is null for libcalls where that information may not be available.)  */
-#define FUNCTION_ARG_ADVANCE(CUM, MODE, TYPE, NAMED)	\
-  (function_arg_advance (&CUM, MODE, TYPE, NAMED))
-
 /* Define how to find the value returned by a function.
    VALTYPE is the data type of the value (as a tree).
    If the precise function being called is known, FUNC is its FUNCTION_DECL;