=> R0 = reason code
<= R0 = returned value
This SWI enables you to read current state variables.
Read info subreason code
R0 Returns
0 Get current routine
RTSupport handle for current routine, or 0 if in foreground, or -1 if in interrupt context
1 Get current priority setting
Integer value, or -1 if in interrupt context
2 Get base address of SVC stack
Base address of SVC stack for real-time routines
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