In user mode on Windows, it points to TEB (Thread Environment Block). more information here https://learn.microsoft.com/en-us/cpp/build/arm64-windows-abi-conventions?view=msvc-170#integer-registers https://learn.microsoft.com/en-us/windows/win32/api/winternl/ns-winternl-teb
Regards, Evgeny -----Original Message----- Friday, February 23, 2024 5:56 PM Richard Sandiford wrote: How does the MS ABI use this register? Same question for Darwin I suppose. Thanks, Richard
