Hi,
X64 debug register support in GdbStub implementation in EmbeddedPkg
dereferences EFI_SYSTEM_CONTEXT through SystemContextIa32 union member and
not SystemContextX64:
https://github.com/tianocore/edk2/blob/master/EmbeddedPkg/GdbStub/X64/Processor.c#L423
Link highlights only one instance of the problem - there are many more.
This led to state corruption when i tried to debug EFI firmware running on
amd64 processor.
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