diff --git a/MdePkg/Include/Ia32/ProcessorBind.h b/MdePkg/Include/Ia32/ProcessorBind.h
index a397f4b4b5..5bb57fc7e2 100644
--- a/MdePkg/Include/Ia32/ProcessorBind.h
+++ b/MdePkg/Include/Ia32/ProcessorBind.h
@@ -333,7 +333,7 @@ typedef INT32   INTN;
 #endif
 
 //
-// For symbol name in GNU assembly code, an extra "_" is necessary
+// Macros for GNU assembly code
 //
 #if defined(__GNUC__)
   #if defined(linux)
@@ -341,11 +341,11 @@ typedef INT32   INTN;
   #else
     #define ASM_PFX(name) _##name
   #endif 
-  #if defined(__APPLE__)
-    #define ASM_GLOBAL .globl
-  #else
-    #define ASM_GLOBAL .global
-  #endif 
+  ///
+  /// For GNU assembly code, .global or .globl can declare global symbols.
+  /// Define this macro to unify the usage.
+  ///
+  #define ASM_GLOBAL .globl
 #endif
 
 /**
diff --git a/MdePkg/Include/Ipf/ProcessorBind.h b/MdePkg/Include/Ipf/ProcessorBind.h
index 9c41f3ebc1..da79467c75 100644
--- a/MdePkg/Include/Ipf/ProcessorBind.h
+++ b/MdePkg/Include/Ipf/ProcessorBind.h
@@ -392,11 +392,11 @@ typedef INT64   INTN;
   #define GLOBAL_REMOVE_IF_UNREFERENCED
 #endif
 
-#if defined(__APPLE__)
-  #define ASM_GLOBAL .globl
-#else
-  #define ASM_GLOBAL .global
-#endif 
+///
+/// For GNU assembly code, .global or .globl can declare global symbols.
+/// Define this macro to unify the usage.
+///
+#define ASM_GLOBAL .globl
 
 ///
 /// A pointer to a function in IPF points to a plabel.
diff --git a/MdePkg/Include/X64/ProcessorBind.h b/MdePkg/Include/X64/ProcessorBind.h
index ce19867851..fd4a91922b 100644
--- a/MdePkg/Include/X64/ProcessorBind.h
+++ b/MdePkg/Include/X64/ProcessorBind.h
@@ -397,19 +397,19 @@ typedef INT64   INTN;
 #endif
 
 //
-// For symbol name in GNU assembly code, an extra "_" is necessary
+// Macros for GNU assembly code
 //
 #if defined(__GNUC__)
   #if defined(linux)
     #define ASM_PFX(name) name
   #else
     #define ASM_PFX(name) _##name
-  #endif  
-  #if defined(__APPLE__)
-    #define ASM_GLOBAL .globl
-  #else
-    #define ASM_GLOBAL .global
   #endif 
+  ///
+  /// For GNU assembly code, .global or .globl can declare global symbols.
+  /// Define this macro to unify the usage.
+  ///
+  #define ASM_GLOBAL .globl
 #endif
 
 /**