Fix the bug in x64 thunk code that it cannot handle the case when GDT is loaded in...

[mirror_edk2.git] / MdePkg / Library / BaseLib / Ia32 / LRotU64.S

diff --git a/MdePkg/Library/BaseLib/Ia32/LRotU64.S b/MdePkg/Library/BaseLib/Ia32/LRotU64.S
index a9f72d8505533119cc679875817c90288fe4ec18..246115dce693145a5c79eb5063a67813db362702 100644 (file)
--- a/MdePkg/Library/BaseLib/Ia32/LRotU64.S
+++ b/MdePkg/Library/BaseLib/Ia32/LRotU64.S
@@ -1,6 +1,6 @@
 #------------------------------------------------------------------------------\r
 #\r
-# Copyright (c) 2006, Intel Corporation\r
+# Copyright (c) 2006 - 2008, Intel Corporation\r
 # All rights reserved. This program and the accompanying materials\r
 # are licensed and made available under the terms and conditions of the BSD License\r
 # which accompanies this distribution.  The full text of the license may be found at\r
@@ -11,7 +11,7 @@
 #\r
 # Module Name:\r
 #\r
-#   LRotU64.asm\r
+#   LRotU64.S\r
 #\r
 # Abstract:\r
 #\r
@@ -19,7 +19,7 @@
 #\r
 #------------------------------------------------------------------------------\r
 \r
-.global _InternalMathLRotU64\r
+ASM_GLOBAL ASM_PFX(InternalMathLRotU64)\r
 \r
 #------------------------------------------------------------------------------\r
 # UINT64\r
@@ -29,7 +29,7 @@
 #   IN      UINTN                     Count\r
 #   );\r
 #------------------------------------------------------------------------------\r
-_InternalMathLRotU64:\r
+ASM_PFX(InternalMathLRotU64):\r
     push    %ebx\r
     movb    16(%esp), %cl\r
     movl    12(%esp), %edx\r
@@ -38,7 +38,7 @@ _InternalMathLRotU64:
     shldl   %cl, %eax, %edx\r
     rorl    %cl, %ebx\r
     shldl   %cl, %ebx, %eax\r
-    testb   $32, %cl\r
+    testb   $32, %cl                    # Count >= 32?\r
     cmovnz  %eax, %ecx\r
     cmovnz  %edx, %eax\r
     cmovnz  %ecx, %edx\r