UefiCpuPkg: Fix nasm warning "signed byte value exceeds"

Currently, "push byte %[Vector]" causes nasm warning when Vector is larger
than 0x7F. This is because push accepts a signed value, and byte means
signed int8. Maximum signed int8 is 0x7F.
When Vector is larger the 0x7F, for example, when Vector is 255, byte 255
turns to -1, and causes the warning "signed byte value exceeds".
To avoid such warning, use dword instead of byte, this will increase 3 bytes
for each IdtVector.
For IA32, the size of IdtVector will increase from 10 bytes to 13 bytes.
For X64, the size of IdtVector will increase from 15 bytes to 18 bytes.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Ray Ni <ray.ni@intel.com>
Cc: Rahul Kumar <rahul1.kumar@intel.com>
Cc: Debkumar De <debkumar.de@intel.com>
Cc: Harry Han <harry.han@intel.com>
Cc: Catharine West <catharine.west@intel.com>
Reviewed-by: Ray Ni <ray.ni@intel.com>
Signed-off-by: Zhiguang Liu <zhiguang.liu@intel.com>

1 files changed, 5 insertions, 6 deletions

diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/Xcode5ExceptionHandlerAsm.nasm b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/Xcode5ExceptionHandlerAsm.nasm
index 7c0e3d3b0b..9574785742 100644
--- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/Xcode5ExceptionHandlerAsm.nasm
+++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/Xcode5ExceptionHandlerAsm.nasm
@@ -57,18 +57,17 @@ ALIGN   8
 AsmIdtVectorBegin:

 %assign Vector 0

 %rep  256

-    push    byte %[Vector]

+    push    strict dword %[Vector] ; This instruction pushes sign-extended 8-byte value on stack

     push    rax

-    mov     rax, strict qword 0 ;    mov     rax, ASM_PFX(CommonInterruptEntry)

+    mov     rax, strict qword 0    ; mov     rax, ASM_PFX(CommonInterruptEntry)

     jmp     rax

 %assign Vector Vector+1

 %endrep

 AsmIdtVectorEnd:

 

 HookAfterStubHeaderBegin:

-    db      0x6a        ; push

-@VectorNum:

-    db      0          ; 0 will be fixed

+    push    strict dword 0      ; 0 will be fixed

+VectorNum:

     push    rax

     mov     rax, strict qword 0 ;     mov     rax, HookAfterStubHeaderEnd

 JmpAbsoluteAddress:

@@ -478,6 +477,6 @@ ASM_PFX(AsmGetTemplateAddressMap):
 global ASM_PFX(AsmVectorNumFixup)

 ASM_PFX(AsmVectorNumFixup):

     mov     rax, rdx

-    mov     [rcx + (@VectorNum - HookAfterStubHeaderBegin)], al

+    mov     [rcx + (VectorNum - 4 - HookAfterStubHeaderBegin)], al

     ret