Changes

svcReturnFromException updates the contents of the kernel stack frame with what the user provided in the TLS structure, sets TPIDR_EL0 to 1, then:

svcReturnFromException updates the contents of the kernel stack frame with what the user provided in the TLS structure, sets TPIDR_EL0 to 1, then:

* if the provided error code is 0, gracefully pivots and returns from exception

* if the provided error code is 0, gracefully pivots and returns from exception

* if it is not, replays the exception and pass it to the KDebug (see above). One can pass 0x10001 to prevent process termination

* if it is not, replays the exception and pass it to the KDebug (see above). One can pass 0x10001 to prevent process termination. If the process is attached, this also prevents crash-collection/termination (different from the exception handler behavior)

Note that if a thread that wasn't faulting calls svcReturnFromException, it signals an "invalid syscall" exception

Note that if a thread that wasn't faulting calls svcReturnFromException, it signals an "invalid syscall" exception