DCPS3 Debug Change PE State to EL3 Debug Change PE State to EL3 allows the debugger to move the PE into EL3 from a lower Exception level or to a specific mode at the current Exception level. DCPS3 is undefined if any of: The PE is in Non-debug state. EL3 is not implemented. EDSCR.SDD is set to 1. When the PE executes DCPS3: If EL3 is using AArch32, the PE enters Monitor mode and LR_mon, SPSR_mon, DLR and DSPSR become UNKNOWN. If DCPS3 is executed in Monitor mode, SCR.NS is cleared to 0. If EL3 is using AArch64, the PE enters EL3 using AArch64, selects SP_EL3, and ELR_EL3, ESR_EL3, SPSR_EL3, DLR_EL0 and DSPSR_EL0 become UNKNOWN. For more information on the operation of the DCPS<n> instructions, see DCPS. 1 1 1 1 0 1 1 1 1 0 0 0 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 DCPS3 if !HaveEL(EL3) then UNDEFINED; if !Halted() || EDSCR.SDD == '1' then UNDEFINED; if ELUsingAArch32(EL3) then from_secure = CurrentSecurityState() == SS_Secure; if PSTATE.M == M32_Monitor then SCR.NS = '0'; AArch32.WriteMode(M32_Monitor); if HavePANExt() then if !from_secure then PSTATE.PAN = '0'; elsif SCTLR.SPAN == '0' then PSTATE.PAN = '1'; PSTATE.E = SCTLR.EE; LR_mon = bits(32) UNKNOWN; SPSR_mon = bits(32) UNKNOWN; DLR = bits(32) UNKNOWN; DSPSR = bits(32) UNKNOWN; else // Targeting EL3 using AArch64 AArch64.MaybeZeroRegisterUppers(); MaybeZeroSVEUppers(EL3); PSTATE.nRW = '0'; PSTATE.SP = '1'; PSTATE.EL = EL3; if HaveUAOExt() then PSTATE.UAO = '0'; ELR_EL3 = bits(64) UNKNOWN; ESR_EL3 = bits(64) UNKNOWN; SPSR_EL3 = bits(64) UNKNOWN; DLR_EL0 = bits(64) UNKNOWN; DSPSR_EL0 = bits(64) UNKNOWN; sync_errors = HaveIESB() && SCTLR_EL3.IESB == '1'; if HaveDoubleFaultExt() && EffectiveEA() == '1' && SCR_EL3.NMEA == '1' then sync_errors = TRUE; // SCTLR_EL3.IESB might be ignored in Debug state. if !ConstrainUnpredictableBool(Unpredictable_IESBinDebug) then sync_errors = FALSE; if sync_errors then SynchronizeErrors(); UpdateEDSCRFields(); // Update EDSCR PE state flags