diff options
Diffstat (limited to 'UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchExceptionHandler.c')
| -rw-r--r-- | UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchExceptionHandler.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchExceptionHandler.c b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchExceptionHandler.c index 80e9f08e5b..4e85880ed4 100644 --- a/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchExceptionHandler.c +++ b/UefiCpuPkg/Library/CpuExceptionHandlerLib/X64/ArchExceptionHandler.c @@ -223,7 +223,10 @@ ArchSetupExceptionStack ( // Fixup exception task descriptor and task-state segment
//
ZeroMem (Tss, sizeof (*Tss));
- StackTop = StackTop - CPU_STACK_ALIGNMENT;
+ //
+ // Plus 1 byte is for compact stack layout in case StackTop is already aligned.
+ //
+ StackTop = StackTop - CPU_STACK_ALIGNMENT + 1;
StackTop = (UINTN)ALIGN_POINTER (StackTop, CPU_STACK_ALIGNMENT);
IdtTable = (IA32_IDT_GATE_DESCRIPTOR *)Idtr.Base;
for (Index = 0; Index < CPU_STACK_SWITCH_EXCEPTION_NUMBER; ++Index) {
|