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Shared Debug.DebugTarget Pseudocode

Library pseudocode for shared/debug/DebugTarget/DebugTarget

// DebugTarget()
// =============
// Returns the debug exception target Exception level

bits(2) DebugTarget()
    secure = IsSecure();
    return DebugTargetFrom(secure);

Library pseudocode for shared/debug/DebugTarget/DebugTargetFrom

// DebugTargetFrom()
// =================

bits(2) DebugTargetFrom(boolean secure)
    if HaveEL(EL2) && !secure then
        if ELUsingAArch32(EL2) then
            route_to_el2 = (HDCR.TDE == '1' || HCR.TGE == '1');
        else
            route_to_el2 = (MDCR_EL2.TDE == '1' || HCR_EL2.TGE == '1');
    else
        route_to_el2 = FALSE;

    if route_to_el2 then
        target = EL2;
    elsif HaveEL(EL3) && HighestELUsingAArch32() && secure then
        target = EL3;
    else
        target = EL1;

    return target;
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