SDER32_EL3, AArch32 Secure Debug Enable Register
The SDER32_EL3 characteristics are:
Purpose
Allows access to the AArch32 register SDER from AArch64 state only. Its value has no effect on execution in AArch64 state.
Configuration
AArch64 System register SDER32_EL3 bits [31:0] are architecturally mapped to AArch32 System register SDER[31:0] .
If EL1 is AArch64 only, this register is UNDEFINED.
This register is in the Warm reset domain. On a Warm or Cold reset RW fields in this register reset to architecturally UNKNOWN values.
Attributes
SDER32_EL3 is a 64-bit register.
Field descriptions
The SDER32_EL3 bit assignments are:
| 63 | 62 | 61 | 60 | 59 | 58 | 57 | 56 | 55 | 54 | 53 | 52 | 51 | 50 | 49 | 48 | 47 | 46 | 45 | 44 | 43 | 42 | 41 | 40 | 39 | 38 | 37 | 36 | 35 | 34 | 33 | 32 |
| RES0 | |||||||||||||||||||||||||||||||
| RES0 | SUNIDEN | SUIDEN | |||||||||||||||||||||||||||||
| 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 |
Bits [63:2]
Reserved, RES0.
SUNIDEN, bit [1]
Secure User Non-Invasive Debug Enable:
| SUNIDEN | Meaning |
|---|---|
| 0b0 |
Performance Monitors event counting prohibited in Secure EL0 unless allowed by MDCR_EL3.SPME or the IMPLEMENTATION DEFINED authentication interface ExternalSecureNoninvasiveDebugEnabled(). |
| 0b1 |
Performance Monitors event counting allowed in Secure EL0. |
On a Warm reset, this field resets to an architecturally UNKNOWN value.
SUIDEN, bit [0]
Secure User Invasive Debug Enable:
| SUIDEN | Meaning |
|---|---|
| 0b0 |
Debug exceptions other than Breakpoint Instruction exceptions from Secure EL0 are disabled, unless enabled by MDCR_EL3.SPD32. |
| 0b1 |
Debug exceptions from Secure EL0 are enabled. |
On a Warm reset, this field resets to an architecturally UNKNOWN value.
Accessing the SDER32_EL3
Accesses to this register use the following encodings:
MRS <Xt>, SDER32_EL3
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b11 | 0b110 | 0b0001 | 0b0001 | 0b001 |
if PSTATE.EL == EL0 then
UNDEFINED;
elsif PSTATE.EL == EL1 then
UNDEFINED;
elsif PSTATE.EL == EL2 then
UNDEFINED;
elsif PSTATE.EL == EL3 then
return SDER32_EL3;
MSR SDER32_EL3, <Xt>
| op0 | op1 | CRn | CRm | op2 |
|---|---|---|---|---|
| 0b11 | 0b110 | 0b0001 | 0b0001 | 0b001 |
if PSTATE.EL == EL0 then
UNDEFINED;
elsif PSTATE.EL == EL1 then
UNDEFINED;
elsif PSTATE.EL == EL2 then
UNDEFINED;
elsif PSTATE.EL == EL3 then
SDER32_EL3 = X[t];