[EXTERNAL] [edk2-devel] [PATCH 4/4] UefiCpuPkg/CpuExceptionHandler: Revert binary patching in standard CpuExceptionHandlerLib
Bret Barkelew via groups.io
bret.barkelew=microsoft.com at groups.io
Fri May 1 20:49:23 UTC 2020
Acked-by: Bret Barkelew <bret.barkelew at microsoft.com>
- Bret
________________________________
From: devel at edk2.groups.io <devel at edk2.groups.io> on behalf of Lendacky, Thomas via groups.io <thomas.lendacky=amd.com at groups.io>
Sent: Friday, May 1, 2020 1:17:41 PM
To: devel at edk2.groups.io <devel at edk2.groups.io>
Cc: Jordan Justen <jordan.l.justen at intel.com>; Laszlo Ersek <lersek at redhat.com>; Ard Biesheuvel <ard.biesheuvel at linaro.org>; Liming Gao <liming.gao at intel.com>; Eric Dong <eric.dong at intel.com>; Ray Ni <ray.ni at intel.com>; Brijesh Singh <brijesh.singh at amd.com>; Anthony Perard <anthony.perard at citrix.com>; Benjamin You <benjamin.you at intel.com>; Guo Dong <guo.dong at intel.com>; Julien Grall <julien at xen.org>; Maurice Ma <maurice.ma at intel.com>; Andrew Fish <afish at apple.com>
Subject: [EXTERNAL] [edk2-devel] [PATCH 4/4] UefiCpuPkg/CpuExceptionHandler: Revert binary patching in standard CpuExceptionHandlerLib
BZ: https://nam06.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugzilla.tianocore.org%2Fshow_bug.cgi%3Fid%3D2340&data=02%7C01%7Cbret.barkelew%40microsoft.com%7Cc233bc94949a424f66bf08d7ee0cc626%7C72f988bf86f141af91ab2d7cd011db47%7C1%7C0%7C637239610952998859&sdata=rm%2FpiCDgatUHtU9PEQGWTzFT70XmkpbIukV7eiHWHeo%3D&reserved=0
Now that an XCODE5 specific CpuExceptionHandlerLib library is in place,
revert the changes made to the ExceptionHandlerAsm.nasm in commit
2db0ccc2d7fe ("UefiCpuPkg: Update CpuExceptionHandlerLib pass XCODE5 tool
chain") so that binary patching of flash code is not performed.
Cc: Eric Dong <eric.dong at intel.com>
Cc: Ray Ni <ray.ni at intel.com>
Cc: Laszlo Ersek <lersek at redhat.com>
Cc: Liming Gao <liming.gao at intel.com>
Signed-off-by: Tom Lendacky <thomas.lendacky at amd.com>
---
.../X64/ExceptionHandlerAsm.nasm | 25 +++++--------------
1 file changed, 6 insertions(+), 19 deletions(-)
diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ExceptionHandlerAsm.nasm b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ExceptionHandlerAsm.nasm
index 19198f273137..3814f9de3703 100644
--- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ExceptionHandlerAsm.nasm
+++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ExceptionHandlerAsm.nasm
@@ -34,7 +34,7 @@ AsmIdtVectorBegin:
db 0x6a ; push #VectorNum
db ($ - AsmIdtVectorBegin) / ((AsmIdtVectorEnd - AsmIdtVectorBegin) / 32) ; VectorNum
push rax
- mov rax, strict qword 0 ; mov rax, ASM_PFX(CommonInterruptEntry)
+ mov rax, ASM_PFX(CommonInterruptEntry)
jmp rax
%endrep
AsmIdtVectorEnd:
@@ -44,8 +44,7 @@ HookAfterStubHeaderBegin:
@VectorNum:
db 0 ; 0 will be fixed
push rax
- mov rax, strict qword 0 ; mov rax, HookAfterStubHeaderEnd
-JmpAbsoluteAddress:
+ mov rax, HookAfterStubHeaderEnd
jmp rax
HookAfterStubHeaderEnd:
mov rax, rsp
@@ -257,7 +256,8 @@ HasErrorCode:
; and make sure RSP is 16-byte aligned
;
sub rsp, 4 * 8 + 8
- call ASM_PFX(CommonExceptionHandler)
+ mov rax, ASM_PFX(CommonExceptionHandler)
+ call rax
add rsp, 4 * 8 + 8
cli
@@ -365,24 +365,11 @@ DoIret:
; comments here for definition of address map
global ASM_PFX(AsmGetTemplateAddressMap)
ASM_PFX(AsmGetTemplateAddressMap):
- lea rax, [AsmIdtVectorBegin]
+ mov rax, AsmIdtVectorBegin
mov qword [rcx], rax
mov qword [rcx + 0x8], (AsmIdtVectorEnd - AsmIdtVectorBegin) / 32
- lea rax, [HookAfterStubHeaderBegin]
+ mov rax, HookAfterStubHeaderBegin
mov qword [rcx + 0x10], rax
-
-; Fix up CommonInterruptEntry address
- lea rax, [ASM_PFX(CommonInterruptEntry)]
- lea rcx, [AsmIdtVectorBegin]
-%rep 32
- mov qword [rcx + (JmpAbsoluteAddress - 8 - HookAfterStubHeaderBegin)], rax
- add rcx, (AsmIdtVectorEnd - AsmIdtVectorBegin) / 32
-%endrep
-; Fix up HookAfterStubHeaderEnd
- lea rax, [HookAfterStubHeaderEnd]
- lea rcx, [JmpAbsoluteAddress]
- mov qword [rcx - 8], rax
-
ret
;-------------------------------------------------------------------------------------
--
2.17.1
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