Nate,
GCC generates assembly code that uses `RBP` to store `Private` local variable
for below C code in PeiCore/Dispatcher.c
```c
if (StackOffsetPositive) {
SecCoreData = (CONST EFI_SEC_PEI_HAND_OFF *)((UINTN)(VOID *)SecCoreData
+ StackOffset);
Private = (PEI_CORE_INSTANCE *)((UINTN)(VOID *)Private +
StackOffset);
} else {
SecCoreData = (CONST EFI_SEC_PEI_HAND_OFF *)((UINTN)(VOID *)SecCoreData
- StackOffset);
Private = (PEI_CORE_INSTANCE *)((UINTN)(VOID *)Private -
StackOffset);
}
TemporaryRamSupportPpi->TemporaryRamMigration (
PeiServices,
TemporaryRamBase,
(EFI_PHYSICAL_ADDRESS)(UINTN)(TopOfNewStack -
TemporaryStackSize),
TemporaryRamSize
);
PeiCore (SecCoreData, NULL, Private);
```
If `TemporaryRamMigration()` updates the `RBP` to point to physical memory by
adding/subtracting
the `StackOffset`, that results the Private is added/subtracted by
`StackOffset` twice: One in the C code before calling
TemporayRamSupport PPI, the other in `TemporaryRamMigration ()`.
Since `FspSecMain.SecSwitchStack()` does update the `RBP`, have you met the
similar issue?
The issue doesn't always happen. It depends on whether `RBP` is used to store
either `SecCoreData` or `Private`.
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