efi_loader: __cyg_profile_func_enter/_exit

U-Boot can be compiled with function tracing enabled.

When compiling with FTRACE __cyg_profile_func_enter() is called when a
function is entered and __cyg_profile_func_exit() when the function is
left.

To avoid a crash we have to define these function for the free-standing
UEFI binaries.
Signed-off-by: NHeinrich Schuchardt <xypron.glpk@gmx.de>

lib/efi_loader/efi_freestanding.c

@@ -88,3 +88,35 @@ void *memset(void *s, int c, size_t n)
 		*d++ = c;
 	return s;
 }
+
+/**
+ * __cyg_profile_func_enter() - record function entry
+ *
+ * This is called on every function entry when compiling with
+ * -finstrument-functions.
+ *
+ * We do nothing here.
+ *
+ * @param func_ptr	Pointer to function being entered
+ * @param caller	Pointer to function which called this function
+ */
+void __attribute__((no_instrument_function))
+__cyg_profile_func_enter(void *func_ptr, void *caller)
+{
+}
+
+/**
+ * __cyg_profile_func_exit() - record function exit
+ *
+ * This is called on every function exit when compiling with
+ * -finstrument-functions.
+ *
+ * We do nothing here.
+ *
+ * @param func_ptr	Pointer to function being entered
+ * @param caller	Pointer to function which called this function
+ */
+void __attribute__((no_instrument_function))
+__cyg_profile_func_exit(void *func_ptr, void *caller)
+{
+}