.../Library/SmmCpuFeaturesLib/Ia32/SmiEntry.nasm | 24 ++++++++++-------- .../SmmCpuFeaturesLib/Ia32/SmiException.nasm | 5 ++-- .../Library/SmmCpuFeaturesLib/X64/SmiEntry.nasm | 29 ++++++++++++---------- .../SmmCpuFeaturesLib/X64/SmiException.nasm | 5 ++-- 4 files changed, 34 insertions(+), 29 deletions(-)
Replace hard-coded machine code with equivalent assembly source code.
Changes tested by checking for machine code equivalence by disassembling
the original and changed code.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Chris Ruffin <chris.ruffin@intel.com>
Cc: Yao, Jiewen <jiewen.yao@intel.com>
Cc: Kinney, Michael D <michael.d.kinney@intel.com>
---
.../Library/SmmCpuFeaturesLib/Ia32/SmiEntry.nasm | 24 ++++++++++--------
.../SmmCpuFeaturesLib/Ia32/SmiException.nasm | 5 ++--
.../Library/SmmCpuFeaturesLib/X64/SmiEntry.nasm | 29 ++++++++++++----------
.../SmmCpuFeaturesLib/X64/SmiException.nasm | 5 ++--
4 files changed, 34 insertions(+), 29 deletions(-)
diff --git a/UefiCpuPkg/Library/SmmCpuFeaturesLib/Ia32/SmiEntry.nasm b/UefiCpuPkg/Library/SmmCpuFeaturesLib/Ia32/SmiEntry.nasm
index b1c84a494f..00c0f0672c 100644
--- a/UefiCpuPkg/Library/SmmCpuFeaturesLib/Ia32/SmiEntry.nasm
+++ b/UefiCpuPkg/Library/SmmCpuFeaturesLib/Ia32/SmiEntry.nasm
@@ -1,5 +1,5 @@
;------------------------------------------------------------------------------ ;
-; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2016 - 2017, Intel Corporation. All rights reserved.<BR>
; This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License
; which accompanies this distribution. The full text of the license may be found at
@@ -51,6 +51,11 @@ global ASM_PFX(gStmSmbase)
global ASM_PFX(gStmXdSupported)
extern ASM_PFX(gStmSmiHandlerIdtr)
+ASM_PFX(gStmSmiCr3) EQU StmSmiCr3Patch - 4
+ASM_PFX(gStmSmiStack) EQU StmSmiStackPatch - 4
+ASM_PFX(gStmSmbase) EQU StmSmbasePatch - 4
+ASM_PFX(gStmXdSupported) EQU StmXdSupportedPatch - 1
+
SECTION .text
BITS 16
@@ -66,8 +71,8 @@ _StmSmiEntryPoint:
o32 lgdt [cs:bx] ; lgdt fword ptr cs:[bx]
mov ax, PROTECT_MODE_CS
mov [cs:bx-0x2],ax
- DB 0x66, 0xbf ; mov edi, SMBASE
-ASM_PFX(gStmSmbase): DD 0
+o32 mov edi, strict dword 0
+StmSmbasePatch:
lea eax, [edi + (@32bit - _StmSmiEntryPoint) + 0x8000]
mov [cs:bx-0x6],eax
mov ebx, cr0
@@ -87,15 +92,15 @@ o16 mov es, ax
o16 mov fs, ax
o16 mov gs, ax
o16 mov ss, ax
- DB 0xbc ; mov esp, imm32
-ASM_PFX(gStmSmiStack): DD 0
+ mov esp, strict dword 0
+StmSmiStackPatch:
mov eax, ASM_PFX(gStmSmiHandlerIdtr)
lidt [eax]
jmp ProtFlatMode
ProtFlatMode:
- DB 0xb8 ; mov eax, imm32
-ASM_PFX(gStmSmiCr3): DD 0
+ mov eax, strict dword 0
+StmSmiCr3Patch:
mov cr3, eax
;
; Need to test for CR4 specific bit support
@@ -134,8 +139,8 @@ ASM_PFX(gStmSmiCr3): DD 0
.6:
; enable NXE if supported
- DB 0b0h ; mov al, imm8
-ASM_PFX(gStmXdSupported): DB 1
+ mov al, strict byte 1
+StmXdSupportedPatch:
cmp al, 0
jz @SkipXd
;
@@ -268,4 +273,3 @@ _StmSmiHandler:
ASM_PFX(gcStmSmiHandlerSize) : DW $ - _StmSmiEntryPoint
ASM_PFX(gcStmSmiHandlerOffset) : DW _StmSmiHandler - _StmSmiEntryPoint
-
diff --git a/UefiCpuPkg/Library/SmmCpuFeaturesLib/Ia32/SmiException.nasm b/UefiCpuPkg/Library/SmmCpuFeaturesLib/Ia32/SmiException.nasm
index 0ce8501ba9..93dc3005b7 100644
--- a/UefiCpuPkg/Library/SmmCpuFeaturesLib/Ia32/SmiException.nasm
+++ b/UefiCpuPkg/Library/SmmCpuFeaturesLib/Ia32/SmiException.nasm
@@ -1,5 +1,5 @@
;------------------------------------------------------------------------------ ;
-; Copyright (c) 2009 - 2016, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2009 - 2017, Intel Corporation. All rights reserved.<BR>
; This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License
; which accompanies this distribution. The full text of the license may be found at
@@ -87,7 +87,7 @@ ASM_PFX(OnException):
mov ebx, eax
mov eax, 4
- DB 0x0f, 0x01, 0x0c1 ; VMCALL
+ vmcall
jmp $
global ASM_PFX(OnStmSetup)
@@ -173,4 +173,3 @@ ASM_PFX(OnStmTeardown):
.72:
rsm
-
diff --git a/UefiCpuPkg/Library/SmmCpuFeaturesLib/X64/SmiEntry.nasm b/UefiCpuPkg/Library/SmmCpuFeaturesLib/X64/SmiEntry.nasm
index c801591fc7..bcac643e96 100644
--- a/UefiCpuPkg/Library/SmmCpuFeaturesLib/X64/SmiEntry.nasm
+++ b/UefiCpuPkg/Library/SmmCpuFeaturesLib/X64/SmiEntry.nasm
@@ -1,5 +1,5 @@
;------------------------------------------------------------------------------ ;
-; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2016 - 2017, Intel Corporation. All rights reserved.<BR>
; This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License
; which accompanies this distribution. The full text of the license may be found at
@@ -61,6 +61,11 @@ global ASM_PFX(gcStmSmiHandlerTemplate)
global ASM_PFX(gcStmSmiHandlerSize)
global ASM_PFX(gcStmSmiHandlerOffset)
+ASM_PFX(gStmSmbase) EQU StmSmbasePatch - 4
+ASM_PFX(gStmSmiStack) EQU StmSmiStackPatch - 4
+ASM_PFX(gStmSmiCr3) EQU StmSmiCr3Patch - 4
+ASM_PFX(gStmXdSupported) EQU StmXdSupportedPatch - 1
+
DEFAULT REL
SECTION .text
@@ -76,8 +81,8 @@ _StmSmiEntryPoint:
o32 lgdt [cs:bx] ; lgdt fword ptr cs:[bx]
mov ax, PROTECT_MODE_CS
mov [cs:bx-0x2],ax
- DB 0x66, 0xbf ; mov edi, SMBASE
-ASM_PFX(gStmSmbase): DD 0
+o32 mov edi, strict dword 0
+StmSmbasePatch:
lea eax, [edi + (@ProtectedMode - _StmSmiEntryPoint) + 0x8000]
mov [cs:bx-0x6],eax
mov ebx, cr0
@@ -97,14 +102,14 @@ o16 mov es, ax
o16 mov fs, ax
o16 mov gs, ax
o16 mov ss, ax
- DB 0xbc ; mov esp, imm32
-ASM_PFX(gStmSmiStack): DD 0
+ mov esp, strict dword 0
+StmSmiStackPatch:
jmp ProtFlatMode
BITS 64
ProtFlatMode:
- DB 0xb8 ; mov eax, offset gStmSmiCr3
-ASM_PFX(gStmSmiCr3): DD 0
+ mov eax, strict dword 0
+StmSmiCr3Patch:
mov cr3, rax
mov eax, 0x668 ; as cr4.PGE is not set here, refresh cr3
mov cr4, rax ; in PreModifyMtrrs() to flush TLB.
@@ -119,8 +124,8 @@ ASM_PFX(gStmSmiCr3): DD 0
ltr ax
; enable NXE if supported
- DB 0xb0 ; mov al, imm8
-ASM_PFX(gStmXdSupported): DB 1
+ mov al, strict byte 1
+StmXdSupportedPatch:
cmp al, 0
jz @SkipXd
;
@@ -178,8 +183,7 @@ CommonHandler:
; Save FP registers
;
sub rsp, 0x200
- DB 0x48 ; FXSAVE64
- fxsave [rsp]
+ fxsave64 [rsp]
add rsp, -0x20
@@ -200,8 +204,7 @@ CommonHandler:
;
; Restore FP registers
;
- DB 0x48 ; FXRSTOR64
- fxrstor [rsp]
+ fxrstor64 [rsp]
add rsp, 0x200
diff --git a/UefiCpuPkg/Library/SmmCpuFeaturesLib/X64/SmiException.nasm b/UefiCpuPkg/Library/SmmCpuFeaturesLib/X64/SmiException.nasm
index fe1bf3f165..ce9d7c2bb6 100644
--- a/UefiCpuPkg/Library/SmmCpuFeaturesLib/X64/SmiException.nasm
+++ b/UefiCpuPkg/Library/SmmCpuFeaturesLib/X64/SmiException.nasm
@@ -1,5 +1,5 @@
;------------------------------------------------------------------------------ ;
-; Copyright (c) 2016, Intel Corporation. All rights reserved.<BR>
+; Copyright (c) 2016 - 2017, Intel Corporation. All rights reserved.<BR>
; This program and the accompanying materials
; are licensed and made available under the terms and conditions of the BSD License
; which accompanies this distribution. The full text of the license may be found at
@@ -86,7 +86,7 @@ ASM_PFX(OnException):
add rsp, 0x28
mov ebx, eax
mov eax, 4
- DB 0x0f, 0x01, 0x0c1 ; VMCALL
+ vmcall
jmp $
global ASM_PFX(OnStmSetup)
@@ -176,4 +176,3 @@ ASM_PFX(OnStmTeardown):
.12:
rsm
-
--
2.13.3.windows.1
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