I will help to check-in this patch.

Reviewed-by: Jeff Fan <[email protected]>

-----Original Message-----
From: Jordan Justen [mailto:[email protected]] 
Sent: Saturday, October 18, 2014 12:05 AM
To: [email protected]
Subject: [edk2] [PATCH] MdeModulePkg DebugSupportDxe: Fix build error with GNU 
assembler

The GNU assembler (2.24.51.20140918) is failing to build when movw is used on 
this instruction. Instead use the mov instruction, which matches the other 
cases of loading segment registers.

The error message seen is:
  AsmFuncs.iii:283: Error: incorrect register `%rax' used with `w' suffix

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Jordan Justen <[email protected]>
---
 MdeModulePkg/Universal/DebugSupportDxe/X64/AsmFuncs.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/MdeModulePkg/Universal/DebugSupportDxe/X64/AsmFuncs.S 
b/MdeModulePkg/Universal/DebugSupportDxe/X64/AsmFuncs.S
index 9783ec6..7f0919e 100644
--- a/MdeModulePkg/Universal/DebugSupportDxe/X64/AsmFuncs.S
+++ b/MdeModulePkg/Universal/DebugSupportDxe/X64/AsmFuncs.S
@@ -280,7 +280,7 @@ ExtraPushDone:
 
                 mov     %ds, %rax
                 pushq   %rax
-                movw    %es, %rax
+                mov     %es, %rax
                 pushq   %rax
                 mov     %fs, %rax
                 pushq   %rax
--
2.1.1


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