Controls invasive and non-invasive debug in the Secure EL0 mode.
AArch32 System register SDER bits [31:0] are architecturally mapped to AArch64 System register SDER32_EL2[31:0] when EL2 is implemented and FEAT_SEL2 is implemented.
AArch32 System register SDER bits [31:0] are architecturally mapped to AArch64 System register SDER32_EL3[31:0] when EL3 is implemented.
This register is present only when (EL3 is implemented and EL3 is capable of using AArch32) or (EL1 is capable of using AArch32 and Secure EL1 is implemented). Otherwise, direct accesses to SDER are UNDEFINED.
This register is ignored by the PE when one or more of the following are true:
The PE is in Non-secure state.
EL1 is using AArch64.
SDER is a 32-bit register.
| 31 | 30 | 29 | 28 | 27 | 26 | 25 | 24 | 23 | 22 | 21 | 20 | 19 | 18 | 17 | 16 | 15 | 14 | 13 | 12 | 11 | 10 | 9 | 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
| RES0 | SUNIDEN | SUIDEN | |||||||||||||||||||||||||||||
Reserved, RES0.
Secure User Non-Invasive Debug Enable.
| SUNIDEN | Meaning |
|---|---|
| 0b0 |
This bit has no effect on non-invasive debug. |
| 0b1 |
Non-invasive debug is allowed in Secure EL0 using AArch32. |
When EL3 or Secure EL1 is using AArch32, the forms of non-invasive debug affected by this control are:
When Secure EL1 is using AArch64, this bit has no effect.
The reset behavior of this field is:
Secure User Invasive Debug Enable.
| SUIDEN | Meaning |
|---|---|
| 0b0 |
This bit does not affect the generation of debug exceptions at Secure EL0. |
| 0b1 |
If EL3 or EL1 is using AArch32, debug exceptions from Secure EL0 are enabled. |
The reset behavior of this field is:
Reserved, RES0.
Accesses to this register use the following encodings in the System register encoding space:
MRC{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}
| coproc | opc1 | CRn | CRm | opc2 |
|---|---|---|---|---|
| 0b1111 | 0b000 | 0b0001 | 0b0001 | 0b001 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T1 == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T1 == '1' then AArch32.TakeHypTrapException(0x03); elsif !IsCurrentSecurityState(SS_Secure) then UNDEFINED; elsif EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.<TDE,TDA> != '00' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then AArch64.AArch32SystemAccessTrap(EL3, 0x03); else R[t] = SDER; elsif PSTATE.EL == EL2 then UNDEFINED; elsif PSTATE.EL == EL3 then R[t] = SDER;
MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}
| coproc | opc1 | CRn | CRm | opc2 |
|---|---|---|---|---|
| 0b1111 | 0b000 | 0b0001 | 0b0001 | 0b001 |
if PSTATE.EL == EL0 then UNDEFINED; elsif PSTATE.EL == EL1 then if EL2Enabled() && !ELUsingAArch32(EL2) && HSTR_EL2.T1 == '1' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif EL2Enabled() && ELUsingAArch32(EL2) && HSTR.T1 == '1' then AArch32.TakeHypTrapException(0x03); elsif !IsCurrentSecurityState(SS_Secure) then UNDEFINED; elsif EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.<TDE,TDA> != '00' then AArch64.AArch32SystemAccessTrap(EL2, 0x03); elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDA == '1' then AArch64.AArch32SystemAccessTrap(EL3, 0x03); else SDER = R[t]; elsif PSTATE.EL == EL2 then UNDEFINED; elsif PSTATE.EL == EL3 then if CP15SDISABLE2 == Signal_High then UNDEFINED; else SDER = R[t];