From 4c34a8ea191155f438901e635bd87810072b19a4 Mon Sep 17 00:00:00 2001 From: Chris Ruffin Date: Thu, 28 Sep 2017 09:51:44 +0800 Subject: [PATCH] UefiCpuPkg/SmmCpuFeaturesLib: replace hard-coded machine code 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 Cc: Jiewen Yao Cc: Michael D Kinney Reviewed-by: Eric Dong --- .../SmmCpuFeaturesLib/Ia32/SmiEntry.nasm | 24 ++++++++------- .../SmmCpuFeaturesLib/Ia32/SmiException.nasm | 5 ++-- .../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.
+; Copyright (c) 2016 - 2017, Intel Corporation. All rights reserved.
; 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.
+; Copyright (c) 2009 - 2017, Intel Corporation. All rights reserved.
; 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.
+; Copyright (c) 2016 - 2017, Intel Corporation. All rights reserved.
; 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.
+; Copyright (c) 2016 - 2017, Intel Corporation. All rights reserved.
; 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 - -- 2.39.2