rum Operation Font Conventions
if (PR[qp]) {
if (is_reserved_field(PSR_TYPE, PSR_UM, imm24))
reserved_register_field_fault();

if (imm24{1}) PSR{1} = 0;
if (imm24{2} && PSR.sp == 0) //non-secure perf monitor
PSR{2} = 0;
if (imm24{3}) PSR{3} = 0;
if (imm24{4}) PSR{4} = 0;
if (imm24{5}) PSR{5} = 0;
}