SVC Supervisor call This instruction 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. 1 1 0 1 0 1 0 0 0 0 0 0 0 0 0 1 SVC #<imm> constant bits(16) imm = imm16; <imm> Is a 16-bit unsigned immediate, in the range 0 to 65535, encoded in the "imm16" field. AArch64.CheckForSVCTrap(imm); AArch64.CallSupervisor(imm);