EDECCR External Debug Exception Catch Control Register EDECCR is in the Core power domain Debug 0x098 EDECCR When DoubleLockStatus(), or !IsCorePowered(), or OSLockStatus() ERROR When SoftwareLockStatus(addrdesc) RO RW OSECCR_EL1 Architectural AArch64 31 0 31 0 31 0 31 0 DBGOSECCR Architectural AArch32 31 0 31 0 31 0 31 0 Controls Exception Catch debug events. For more information, see 'Exception Catch debug event'. Debug EDECCR is a 32-bit register. 31 23 31:23 Reserved, RES0. RLR2 22 22 0 Controls exception catch on exception return to Realm EL2 in conjunction with EDECCR.RLE2. 0b0 If EDECCR.RLE2 is 0, then Exception Catch debug events are disabled for Realm EL2. If EDECCR.RLE2 is 1, then Exception Catch debug events are enabled for exception entry and exception return to Realm EL2. 0b1 If EDECCR.RLE2 is 0, then Exception Catch debug events are enabled for exception returns to Realm EL2. If EDECCR.RLE2 is 1, then Exception Catch debug events are enabled for exception entry to Realm EL2. '0' When FEAT_RME is implemented 22 22 22 Reserved, RES0. Otherwise RLR1 21 21 0 Controls exception catch on exception return to Realm EL1 in conjunction with EDECCR.RLE1. 0b0 If EDECCR.RLE1 is 0, then Exception Catch debug events are disabled for Realm EL1. If EDECCR.RLE1 is 1, then Exception Catch debug events are enabled for exception entry and exception return to Realm EL1. 0b1 If EDECCR.RLE1 is 0, then Exception Catch debug events are enabled for exception returns to Realm EL1. If EDECCR.RLE1 is 1, then Exception Catch debug events are enabled for exception entry to Realm EL1. '0' When FEAT_RME is implemented 21 21 21 Reserved, RES0. Otherwise RLR0 20 20 0 Controls exception catch on exception return to Realm EL0. 0b0 Exception Catch debug events are disabled for Realm EL0. 0b1 Exception Catch debug events are enabled for exception returns to Realm EL0. '0' When FEAT_RME is implemented 20 20 20 Reserved, RES0. Otherwise 19 19 19 Reserved, RES0. RLE2 18 18 0 Controls exception catch on exception entry to Realm EL2. Also controls exception catch on exception return to Realm EL2 in conjunction with EDECCR.RLR2. 0b0 If EDECCR.RLR2 is 0, then Exception Catch debug events are disabled for Realm EL2. If EDECCR.RLR2 is 1, then Exception Catch debug events are enabled for exception returns to Realm EL2. 0b1 If EDECCR.RLR2 is 0, then Exception Catch debug events are enabled for exception entry and exception return to Realm EL2. If EDECCR.RLR2 is 1, then Exception Catch debug events are enabled for exception entry to Realm EL2. '0' When FEAT_RME is implemented 18 18 18 Reserved, RES0. Otherwise RLE1 17 17 0 Controls exception catch on exception entry to Realm EL1. Also controls exception catch on exception return to Realm EL1 in conjunction with EDECCR.RLR1. 0b0 If EDECCR.RLR1 is 0, then Exception Catch debug events are disabled for Realm EL1. If EDECCR.RLR1 is 1, then Exception Catch debug events are enabled for exception returns to Realm EL1. 0b1 If EDECCR.RLR1 is 0, then Exception Catch debug events are enabled for exception entry and exception return to Realm EL1. If EDECCR.RLR1 is 1, then Exception Catch debug events are enabled for exception entry to Realm EL1. '0' When FEAT_RME is implemented 17 17 17 Reserved, RES0. Otherwise RLE0 16 16 16 RES0 NSR3 15 15 15 RES0 NSR2 14 14 0 Controls exception catch on exception return to Non-secure EL2 in conjunction with EDECCR.NSE2. 0b0 If EDECCR.NSE2 is 0, then Exception Catch debug events are disabled for Non-secure EL2. If EDECCR.NSE2 is 1, then Exception Catch debug events are enabled for exception entry, reset entry, and exception return to Non-secure EL2. 0b1 If EDECCR.NSE2 is 0, then Exception Catch debug events are enabled for exception returns to Non-secure EL2. If EDECCR.NSE2 is 1, then Exception Catch debug events are enabled for exception entry and reset entry to Non-secure EL2. '0' When FEAT_Debugv8p2 is implemented and Non-secure EL2 is implemented 14 14 14 Reserved, RES0. Otherwise NSR1 13 13 0 Controls exception catch on exception return to Non-secure EL1 in conjunction with EDECCR.NSE1. 0b0 If EDECCR.NSE1 is 0, then Exception Catch debug events are disabled for Non-secure EL1. If EDECCR.NSE1 is 1, then Exception Catch debug events are enabled for exception entry, reset entry, and exception return to Non-secure EL1. 0b1 If EDECCR.NSE1 is 0, then Exception Catch debug events are enabled for exception returns to Non-secure EL1. If EDECCR.NSE1 is 1, then Exception Catch debug events are enabled for exception entry and reset entry to Non-secure EL1. '0' When FEAT_Debugv8p2 is implemented and Non-secure EL1 is implemented 13 13 13 Reserved, RES0. Otherwise NSR0 12 12 0 Controls exception catch on exception return to Non-secure EL0. 0b0 Exception Catch debug events are disabled for Non-secure EL0. 0b1 Exception Catch debug events are enabled for exception returns to Non-secure EL0. '0' When FEAT_Debugv8p2 is implemented and Non-secure EL0 is implemented 12 12 12 Reserved, RES0. Otherwise SR3 11 11 0 Controls exception catch on exception return to EL3 in conjunction with EDECCR.SE3. 0b0 If EDECCR.SE3 is 0, then Exception Catch debug events are disabled for EL3. If EDECCR.SE3 is 1, then Exception Catch debug events are enabled for exception entry, reset entry, and exception return to EL3. 0b1 If EDECCR.SE3 is 0, then Exception Catch debug events are enabled for exception returns to EL3. If EDECCR.SE3 is 1, then Exception Catch debug events are enabled for exception entry and reset entry to EL3. '0' When FEAT_Debugv8p2 is implemented and EL3 is implemented 11 11 11 Reserved, RES0. Otherwise SR2 10 10 0 Controls exception catch on exception return to Secure EL2 in conjunction with EDECCR.SE2. 0b0 If EDECCR.SE2 is 0, then Exception Catch debug events are disabled for Secure EL2. If EDECCR.SE2 is 1, then Exception Catch debug events are enabled for exception entry, reset entry, and exception return to Secure EL2. 0b1 If EDECCR.SE2 is 0, then Exception Catch debug events are enabled for exception returns to Secure EL2. If EDECCR.SE2 is 1, then Exception Catch debug events are enabled for exception entry and reset entry to Secure EL2. '0' When FEAT_Debugv8p2 is implemented and FEAT_SEL2 is implemented 10 10 10 Reserved, RES0. Otherwise SR1 9 9 0 Controls exception catch on exception return to Secure EL1 in conjunction with EDECCR.SE1. 0b0 If EDECCR.SE1 is 0, then Exception Catch debug events are disabled for Secure EL1. If EDECCR.SE1 is 1, then Exception Catch debug events are enabled for exception entry, reset entry, and exception return to Secure EL1. 0b1 If EDECCR.SE1 is 0, then Exception Catch debug events are enabled for exception returns to Secure EL1. If EDECCR.SE1 is 1, then Exception Catch debug events are enabled for exception entry and reset entry to Secure EL1. '0' When FEAT_Debugv8p2 is implemented and Secure EL1 is implemented 9 9 9 Reserved, RES0. Otherwise SR0 8 8 0 Controls exception catch on exception return to Secure EL0. 0b0 Exception Catch debug events are disabled for Secure EL0. 0b1 Exception Catch debug events are enabled for exception returns to Secure EL0. '0' When FEAT_Debugv8p2 is implemented and Secure EL0 is implemented 8 8 8 Reserved, RES0. Otherwise NSE3 7 7 7 RES0 NSE2 6 6 0 Controls exception catch on exception entry to Non-secure EL2. Also controls exception catch on exception return to Non-secure EL2 in conjunction with EDECCR.NSR2. It is IMPLEMENTATION DEFINED whether a reset entry to an Exception level will generate an Exception Catch debug event. 0b0 If EDECCR.NSR2 is 0, then Exception Catch debug events are disabled for Non-secure EL2. If EDECCR.NSR2 is 1, then Exception Catch debug events are enabled for exception returns to Non-secure EL2. 0b1 If EDECCR.NSR2 is 0, then Exception Catch debug events are enabled for exception entry, reset entry, and exception return to Non-secure EL2. If EDECCR.NSR2 is 1, then Exception Catch debug events are enabled for exception entry and reset entry to Non-secure EL2. '0' When FEAT_Debugv8p2 is implemented and Non-secure EL2 is implemented NSE2 6 6 0 Coarse-grained exception catch for Non-secure EL2. Controls Exception Catch debug events for Non-secure EL2. 0b0 Exception Catch debug events are disabled for Non-secure EL2. 0b1 Exception Catch debug events are enabled for Non-secure EL2. '0' When Non-secure EL2 is implemented 6 6 6 Reserved, RES0. Otherwise NSE1 5 5 0 Controls exception catch on exception entry to Non-secure EL1. Also controls exception catch on exception return to Non-secure EL1 in conjunction with EDECCR.NSR1. It is IMPLEMENTATION DEFINED whether a reset entry to an Exception level will generate an Exception Catch debug event. 0b0 If EDECCR.NSR1 is 0, then Exception Catch debug events are disabled for Non-secure EL1. If EDECCR.NSR1 is 1, then Exception Catch debug events are enabled for exception returns to Non-secure EL1. 0b1 If EDECCR.NSR1 is 0, then Exception Catch debug events are enabled for exception entry, reset entry, and exception return to Non-secure EL1. If EDECCR.NSR1 is 1, then Exception Catch debug events are enabled for exception entry and reset entry to Non-secure EL1. '0' When FEAT_Debugv8p2 is implemented and Non-secure EL1 is implemented NSE1 5 5 0 Coarse-grained exception catch for Non-secure EL1. Controls Exception Catch debug events for Non-secure EL1. 0b0 Exception Catch debug events are disabled for Non-secure EL1. 0b1 Exception Catch debug events are enabled for Non-secure EL1. '0' When Non-secure EL1 is implemented 5 5 5 Reserved, RES0. Otherwise NSE0 4 4 4 RES0 SE3 3 3 0 Controls exception catch on exception entry to EL3. Also controls exception catch on exception return to EL3 in conjunction with EDECCR.SR3. It is IMPLEMENTATION DEFINED whether a reset entry to an Exception level will generate an Exception Catch debug event. 0b0 If EDECCR.SR3 is 0, then Exception Catch debug events are disabled for EL3. If EDECCR.SR3 is 1, then Exception Catch debug events are enabled for exception returns to EL3. 0b1 If EDECCR.SR3 is 0, then Exception Catch debug events are enabled for exception entry, reset entry, and exception return to EL3. If EDECCR.SR3 is 1, then Exception Catch debug events are enabled for exception entry and reset entry to EL3. '0' When FEAT_Debugv8p2 is implemented and EL3 is implemented SE3 3 3 0 Coarse-grained exception catch for EL3. Controls Exception Catch debug events for EL3. 0b0 Exception Catch debug events are disabled for EL3. 0b1 Exception Catch debug events are enabled for EL3. '0' When FEAT_Debugv8p2 is not implemented and EL3 is implemented 3 3 3 Reserved, RES0. Otherwise SE2 2 2 0 Controls exception catch on exception entry to Secure EL2. Also controls exception catch on exception return to Secure EL2 in conjunction with EDECCR.SR2. It is IMPLEMENTATION DEFINED whether a reset entry to an Exception level will generate an Exception Catch debug event. 0b0 If EDECCR.SR2 is 0, then Exception Catch debug events are disabled for Secure EL2. If EDECCR.SR2 is 1, then Exception Catch debug events are enabled for exception returns to Secure EL2. 0b1 If EDECCR.SR2 is 0, then Exception Catch debug events are enabled for exception entry, reset entry, and exception return to Secure EL2. If EDECCR.SR2 is 1, then Exception Catch debug events are enabled for exception entry and reset entry to Secure EL2. '0' When FEAT_Debugv8p2 is implemented and FEAT_SEL2 is implemented 2 2 2 Reserved, RES0. Otherwise SE1 1 1 0 Controls exception catch on exception entry to Secure EL1. Also controls exception catch on exception return to Secure EL1 in conjunction with EDECCR.SR1. It is IMPLEMENTATION DEFINED whether a reset entry to an Exception level will generate an Exception Catch debug event. 0b0 If EDECCR.SR1 is 0, then Exception Catch debug events are disabled for Secure EL1. If EDECCR.SR1 is 1, then Exception Catch debug events are enabled for exception returns to Secure EL1. 0b1 If EDECCR.SR1 is 0, then Exception Catch debug events are enabled for exception entry, reset entry, and exception return to Secure EL1. If EDECCR.SR1 is 1, then Exception Catch debug events are enabled for exception entry and reset entry to Secure EL1. '0' When FEAT_Debugv8p2 is implemented and Secure EL1 is implemented SE1 1 1 0 Coarse-grained exception catch for Secure EL1. Controls Exception Catch debug events for Secure EL1. 0b0 Exception Catch debug events are disabled for Secure EL1. 0b1 Exception Catch debug events are enabled for Secure EL1. '0' When Secure EL1 is implemented 1 1 1 Reserved, RES0. Otherwise SE0 0 0 0 RES0 2026-03-26 20:27:25 2026-03_rel