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UefiCpuPkg: CpuExceptionHandlerLib: Make self modifying code work with Xcode

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CpuExceptionHandlerLib has code that contains absolute relocations, not supported by
Xcode for X64, and it then copies this code to an alternate location in memory. It is 
very hard to write IP relative self-modifiying code. I had to update AsmVectorNumFixup()
to also patch in the absolute addressess after the code was copied. 
 
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Anderw Fish <afish@apple.com>
Reviewed-by: Jeff Fan <jeff.fan@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16068 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
Anderw Fish
2014-09-09 06:50:51 +00:00
committed by vanjeff
parent 19ee4a9049
commit 07da1ac8c4
7 changed files with 109 additions and 264 deletions
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2
UefiCpuPkg/Library/CpuExceptionHandlerLib/Ia32/ExceptionHandlerAsm.S
View File

@@ -632,7 +632,7 @@ ASM_PFX(AsmGetTemplateAddressMap):
popl %ebp
ret
#-------------------------------------------------------------------------------------
# AsmVectorNumFixup (*VectorBase, VectorNum);
# AsmVectorNumFixup (*NewVectorAddr, VectorNum, *OldVectorAddr);
#-------------------------------------------------------------------------------------
ASM_GLOBAL ASM_PFX(AsmVectorNumFixup)
ASM_PFX(AsmVectorNumFixup):

2
UefiCpuPkg/Library/CpuExceptionHandlerLib/Ia32/ExceptionHandlerAsm.asm
View File

@@ -434,7 +434,7 @@ AsmGetTemplateAddressMap proc near public
AsmGetTemplateAddressMap ENDP
;-------------------------------------------------------------------------------------
; AsmVectorNumFixup (*VectorBase, VectorNum);
; AsmVectorNumFixup (*NewVectorAddr, VectorNum, *OldVectorAddr);
;-------------------------------------------------------------------------------------
AsmVectorNumFixup proc near public
mov eax, dword ptr [esp + 8]