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From: "Lendacky, Thomas" <thomas.lendacky@amd.com>
To: devel@edk2.groups.io
Cc: Jordan Justen <jordan.l.justen@intel.com>,
	Laszlo Ersek <lersek@redhat.com>,
	Ard Biesheuvel <ard.biesheuvel@linaro.org>,
	Liming Gao <liming.gao@intel.com>,
	Eric Dong <eric.dong@intel.com>, Ray Ni <ray.ni@intel.com>,
	Anthony Perard <anthony.perard@citrix.com>,
	Julien Grall <julien@xen.org>,
	Brijesh Singh <brijesh.singh@amd.com>,
	Andrew Fish <afish@apple.com>
Subject: [PATCH v2 3/3] UefiCpuPkg/CpuExceptionHandler: Revert CpuExceptionHandler binary patching
Date: Wed,  6 May 2020 11:33:02 -0500	[thread overview]
Message-ID: <04d228920c68068ab367e298a943ad26718bb029.1588782781.git.thomas.lendacky@amd.com> (raw)
In-Reply-To: <cover.1588782781.git.thomas.lendacky@amd.com>

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2340

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@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Laszlo Ersek <lersek@redhat.com>
Cc: Liming Gao <liming.gao@intel.com>
Signed-off-by: Tom Lendacky <thomas.lendacky@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


  parent reply	other threads:[~2020-05-06 16:33 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-06 16:32 [PATCH v2 0/3] XCODE5 toolchain binary patching fix Lendacky, Thomas
2020-05-06 16:33 ` [PATCH v2 1/3] UefiCpuPkg/CpuExceptionHandler: Make XCODE5 changes toolchain specific Lendacky, Thomas
2020-05-06 19:01   ` Laszlo Ersek
2020-05-06 20:37     ` [edk2-devel] " Lendacky, Thomas
2020-05-06 16:33 ` [PATCH v2 2/3] OvmfPkg: Use toolchain appropriate CpuExceptionHandlerLib Lendacky, Thomas
2020-05-06 19:04   ` Laszlo Ersek
2020-05-06 16:33 ` Lendacky, Thomas [this message]
2020-05-06 19:31   ` [PATCH v2 3/3] UefiCpuPkg/CpuExceptionHandler: Revert CpuExceptionHandler binary patching Laszlo Ersek
2020-05-06 19:53 ` [PATCH v2 0/3] XCODE5 toolchain binary patching fix Laszlo Ersek

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