bkpt

Breakpoint (Thumb)

BKPT #<imm>

Software Breakpoint (Thumb encoding).

Details

Software Breakpoint (Thumb encoding). This T32 instruction raises a Prefetch Abort exception with the encoded immediate value available to the debugger or exception handler. It is used to halt execution for debugging purposes. No condition flags are affected.

Pseudocode Operation

PrefetchAbort(imm8)

Example

BKPT #16

Encoding

Binary Layout

10111110

imm8

Format Thumb System

Opcode 0xBE00

Extension T32 (Thumb)

Operands

imm
ID

Reference (Arm AArch32 ISA)

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0x01200070	BKPT{<q>} {#}<imm>		A32		cond \| 00010 \| 01 \| 0 \| imm12 \| 0111 \| imm4
0xBE00	BKPT{<q>} {#}<imm>		T32		10111110 \| imm8

Description

Breakpoint causes a Breakpoint Instruction exception. Breakpoint is always unconditional, even when inside an IT block.

Operation

EncodingSpecificOperations();
AArch32.SoftwareBreakpoint(imm16);