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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>
This commit is contained in:
Zhiguang Liu 2022-07-06 21:10:13 +08:00 committed by mergify[bot]
parent fca5de51e1
commit 8a5782d704
3 changed files with 9 additions and 11 deletions
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2
UefiCpuPkg/Library/CpuExceptionHandlerLib/CpuExceptionCommon.h
View File

@ -22,7 +22,7 @@
#define CPU_EXCEPTION_NUM 32
#define CPU_INTERRUPT_NUM 256
#define HOOKAFTER_STUB_SIZE 16
#define HOOKAFTER_STUB_SIZE 18
//
// Exception Error Code of Page-Fault Exception

7
UefiCpuPkg/Library/CpuExceptionHandlerLib/Ia32/ExceptionHandlerAsm.nasm
View File

@ -34,7 +34,7 @@ ALIGN 8
AsmIdtVectorBegin:
%assign Vector 0
%rep 256
push byte %[Vector];
push strict dword %[Vector];
push eax
mov eax, ASM_PFX(CommonInterruptEntry)
jmp eax
@ -43,9 +43,8 @@ AsmIdtVectorBegin:
AsmIdtVectorEnd:
HookAfterStubBegin:
db 0x6a ; push
push strict dword 0 ; 0 will be fixed
VectorNum:
db 0 ; 0 will be fixed
push eax
mov eax, HookAfterStubHeaderEnd
jmp eax
@ -453,5 +452,5 @@ global ASM_PFX(AsmVectorNumFixup)
ASM_PFX(AsmVectorNumFixup):
mov eax, dword [esp + 8]
mov ecx, [esp + 4]
mov [ecx + (VectorNum - HookAfterStubBegin)], al
mov [ecx + (VectorNum - 4 - HookAfterStubBegin)], al
ret

11
UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/Xcode5ExceptionHandlerAsm.nasm
View File

@ -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