=> R0 = Pointer to error block
R1 = "ABEX" (&58454241) If Return code
R2 = Return code
<= Never returns
This SWI passes control over to the most recent exit handler.
If R1 = "ABEX", and 0 <= R2 <= Sys$RCLimit, then Sys$ReturnCode is set to R2.
If R1 = "ABEX" and R2 is outside this range, then Sys$ReturnCode is still set to R2, and a garbled error message issued (0 is used at the pointer to an error block). This is a very long lived OS bug.
See also OS_ExitAndDie
See PRM 1, page 300.
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