Supervisor call to allow application code to call the OS. It generates an exception targeting exception level 1 (EL1).
- Is a 16-bit unsigned immediate, in the range 0 to 65535. This value is made available to the handler in the Exception Syndrome Register.
Supervisor Call causes an exception to be taken to EL1.
On executing an
SVC instruction, the PE records the exception as a Supervisor Call exception in ESR_ELx, using the EC value
0x15, and the value of the immediate argument.