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.

Encoding: System

31	30	29	28	27	26	25	24	23	22	21	20	19	18	17	16	15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
1	1	0	1	0	1	0	0	0	0	1																	0	0	0	0	0
								opc			imm16																op2			LL

BRK #<imm>

Decoding algorithm

constant bits(16) comment = imm16;
if IsFeatureImplemented(FEAT_BTI) then
    SetBTypeCompatible(TRUE);

Operation

AArch64.SoftwareBreakpoint(comment);

Explanations

<imm>: Is a 16-bit unsigned immediate, in the range 0 to 65535, encoded in the "imm16" field.