diff --git a/MdePkg/Include/Ia32/Nasm.inc b/MdePkg/Include/Ia32/Nasm.inc
index 31ce861f1e..fa42f9d3e9 100644
--- a/MdePkg/Include/Ia32/Nasm.inc
+++ b/MdePkg/Include/Ia32/Nasm.inc
@@ -9,6 +9,18 @@
 ;
 ;------------------------------------------------------------------------------
 
+%macro SAVEPREVSSP     0
+    DB 0xF3, 0x0F, 0x01, 0xEA
+%endmacro
+
+%macro CLRSSBSY_EAX    0
+    DB 0x67, 0xF3, 0x0F, 0xAE, 0x30
+%endmacro
+
+%macro RSTORSSP_EAX    0
+    DB 0x67, 0xF3, 0x0F, 0x01, 0x28
+%endmacro
+
 %macro SETSSBSY        0
     DB 0xF3, 0x0F, 0x01, 0xE8
 %endmacro
diff --git a/MdePkg/Include/X64/Nasm.inc b/MdePkg/Include/X64/Nasm.inc
index 42412735ea..e57a803c81 100644
--- a/MdePkg/Include/X64/Nasm.inc
+++ b/MdePkg/Include/X64/Nasm.inc
@@ -9,6 +9,18 @@
 ;
 ;------------------------------------------------------------------------------
 
+%macro SAVEPREVSSP     0
+    DB 0xF3, 0x0F, 0x01, 0xEA
+%endmacro
+
+%macro CLRSSBSY_RAX    0
+    DB 0xF3, 0x0F, 0xAE, 0x30
+%endmacro
+
+%macro RSTORSSP_RAX    0
+    DB 0xF3, 0x0F, 0x01, 0x28
+%endmacro
+
 %macro SETSSBSY        0
     DB 0xF3, 0x0F, 0x01, 0xE8
 %endmacro