Fix bug in EBC thunk for X64 that appears when higher levels of compiler optimization is used.

This is a temporary fix that should for for most tool chains.  A more complete fix will be required to guarantee compatibility with all tool chains.


git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@8970 6f19259b-4bc3-4df7-8a09-765794883524

2 files changed, 4 insertions, 3 deletions

diff --git a/MdeModulePkg/Universal/EbcDxe/X64/EbcLowLevel.asm b/MdeModulePkg/Universal/EbcDxe/X64/EbcLowLevel.asm
index 6741405..2f968ca 100644
--- a/MdeModulePkg/Universal/EbcDxe/X64/EbcLowLevel.asm
+++ b/MdeModulePkg/Universal/EbcDxe/X64/EbcLowLevel.asm
@@ -92,6 +92,7 @@ EbcLLCALLEXNative    ENDP
 ;     The contents of the register in which the entry point is passed.

 ;

 EbcLLGetEbcEntryPoint        PROC    PUBLIC

+    mov  rax, r10

     ret

 EbcLLGetEbcEntryPoint    ENDP

 

diff --git a/MdeModulePkg/Universal/EbcDxe/X64/EbcSupport.c b/MdeModulePkg/Universal/EbcDxe/X64/EbcSupport.c
index 3f84bcc..6c0428d 100644
--- a/MdeModulePkg/Universal/EbcDxe/X64/EbcSupport.c
+++ b/MdeModulePkg/Universal/EbcDxe/X64/EbcSupport.c
@@ -412,14 +412,14 @@ EbcCreateThunks (
 

   //

   // Add code bytes to load up a processor register with the EBC entry point.

-  // mov rax, 123456789abcdef0h  => 48 B8 F0 DE BC 9A 78 56 34 12

+  // mov r10, 123456789abcdef0h  => 48 B8 F0 DE BC 9A 78 56 34 12

   // The first 8 bytes of the thunk entry is the address of the EBC

   // entry point.

   //

-  *Ptr = 0x48;

+  *Ptr = 0x49;

   Ptr++;

   Size--;

-  *Ptr = 0xB8;

+  *Ptr = 0xBA;

   Ptr++;

   Size--;

   Addr = (UINT64) EbcEntryPoint;