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DBGOSLAR, Debug OS Lock Access Register

The DBGOSLAR characteristics are:

Purpose

Provides a lock for the debug registers. The OS Lock also disables some debug exceptions and debug events.

Configuration

AArch32 System register DBGOSLAR bits [31:0] are architecturally mapped to AArch64 System register OSLAR_EL1[31:0] .

AArch32 System register DBGOSLAR bits [31:0] are architecturally mapped to External register OSLAR_EL1[31:0] .

Attributes

DBGOSLAR is a 32-bit register.

Field descriptions

The DBGOSLAR bit assignments are:

313029282726252423222120191817161514131211109876543210
OS Lock Access

OS Lock Access, bits [31:0]

OS Lock Access. Writing the value 0xC5ACCE55 to the DBGOSLAR sets the OS lock to 1. Writing any other value sets the OS lock to 0.

Use DBGOSLSR.OSLK to check the current status of the lock.

Accessing the DBGOSLAR

Accesses to this register use the following encodings:

MCR{<c>}{<q>} <coproc>, {#}<opc1>, <Rt>, <CRn>, <CRm>{, {#}<opc2>}

coprocopc1CRnCRmopc2
0b11100b0000b00010b00000b100
if PSTATE.EL == EL0 then
    UNDEFINED;
elsif PSTATE.EL == EL1 then
    if EL2Enabled() && !ELUsingAArch32(EL2) && MDCR_EL2.<TDE,TDOSA> != '00' then
        AArch64.AArch32SystemAccessTrap(EL2, 0x05);
    elsif EL2Enabled() && ELUsingAArch32(EL2) && HDCR.<TDE,TDOSA> != '00' then
        AArch32.TakeHypTrapException(0x05);
    elsif HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x05);
    else
        DBGOSLAR = R[t];
elsif PSTATE.EL == EL2 then
    if HaveEL(EL3) && !ELUsingAArch32(EL3) && MDCR_EL3.TDOSA == '1' then
        AArch64.AArch32SystemAccessTrap(EL3, 0x05);
    else
        DBGOSLAR = R[t];
elsif PSTATE.EL == EL3 then
    DBGOSLAR = R[t];
              


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