BRK Breakpoint instruction This instruction generates a Breakpoint Instruction exception. The PE records the exception in ESR_ELx, using the EC value 0x3C, and captures the value of the immediate argument in ESR_ELx.ISS. Within a guarded memory region, while PSTATE.BTYPE != 0b00, a BRK instruction will not generate a Branch Target exception and will generate a Breakpoint Instruction exception as normal. For more information, see PSTATE.BTYPE. 1 1 0 1 0 1 0 0 0 0 1 0 0 0 0 0 BRK #<imm> constant bits(16) comment = imm16; if IsFeatureImplemented(FEAT_BTI) then SetBTypeCompatible(TRUE); <imm> Is a 16-bit unsigned immediate, in the range 0 to 65535, encoded in the "imm16" field. AArch64.SoftwareBreakpoint(comment);