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UefiCpuPkg/PiSmmCpuDxeSmm: patch "gSmmInitStack" with PatchInstructionX86()

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Rename the variable to "gPatchSmmInitStack" so that its association with
PatchInstructionX86() is clear from the declaration, change its type to
X86_ASSEMBLY_PATCH_LABEL, and patch it with PatchInstructionX86(). This
lets us remove the binary (DB) encoding of some instructions in
"SmmInit.nasm".

The size of the patched source operand is (sizeof (UINTN)).

Cc: Eric Dong <eric.dong@intel.com>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=866
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>
This commit is contained in:
Laszlo Ersek
2018-02-02 04:46:26 +01:00
parent 456c4ccab2
commit 5830d2c399
4 changed files with 12 additions and 8 deletions
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6
UefiCpuPkg/PiSmmCpuDxeSmm/X64/SmmInit.nasm
View File

@@ -25,7 +25,7 @@ extern ASM_PFX(mSmmRelocationOriginalAddress)
global ASM_PFX(gPatchSmmCr3)
global ASM_PFX(gPatchSmmCr4)
global ASM_PFX(gPatchSmmCr0)
global ASM_PFX(gSmmInitStack)
global ASM_PFX(gPatchSmmInitStack)
global ASM_PFX(gcSmiInitGdtr)
global ASM_PFX(gcSmmInitSize)
global ASM_PFX(gcSmmInitTemplate)
@@ -72,8 +72,8 @@ ASM_PFX(gPatchSmmCr0):
BITS 64
@LongMode: ; long-mode starts here
DB 0x48, 0xbc ; mov rsp, imm64
ASM_PFX(gSmmInitStack): DQ 0
mov rsp, strict qword 0 ; source operand will be patched
ASM_PFX(gPatchSmmInitStack):
and sp, 0xfff0 ; make sure RSP is 16-byte aligned
;
; Accoring to X64 calling convention, XMM0~5 are volatile, we need to save