SDER, Secure Debug Enable Register

The SDER characteristics are:

Purpose

Controls invasive and non-invasive debug in the Secure EL0 mode.

Configuration

AArch32 System register SDER bits [31:0] are architecturally mapped to AArch64 System register SDER32_EL3[31:0] .

This register is present only when HaveEL(EL3) or the implemented Security state is Secure state. 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.

This register is in the Warm reset domain. Some or all RW fields of this register have defined reset values. On a Warm or Cold reset these apply only if the PE resets into an Exception level that is using AArch32. Otherwise, on a Warm or Cold reset RW fields in this register reset to architecturally UNKNOWN values.

Attributes

SDER is a 32-bit register.

Field descriptions

The SDER bit assignments are:

Bits [31:2]

Reserved, RES0.

SUNIDEN, bit [1]

Secure User Non-Invasive Debug Enable.

On a Warm reset, this field resets to 0.

SUIDEN, bit [0]

Secure User Invasive Debug Enable.

On a Warm reset, this field resets to 0.

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 (!HaveEL(EL3) || !ELUsingAArch32(EL3)) && SCR_EL3.NS == '0' then
        return SDER;
    else
        UNDEFINED;
elsif PSTATE.EL == EL2 then
    UNDEFINED;
elsif PSTATE.EL == EL3 then
    return SDER;
              

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 (!HaveEL(EL3) || !ELUsingAArch32(EL3)) && SCR_EL3.NS == '0' then
        SDER = R[t];
    else
        UNDEFINED;
elsif PSTATE.EL == EL2 then
    UNDEFINED;
elsif PSTATE.EL == EL3 then
    if SCR.NS == '0' && CP15SDISABLE2 == HIGH then
        UNDEFINED;
    else
        SDER = R[t];