BKPT -- AArch32

BKPT

Breakpoint causes a Breakpoint Instruction exception.

Breakpoint is always unconditional, even when inside an IT block.

It has encodings from the following instruction sets: A32 ( A1 ) and T32 ( T1 ) .

constant imm16 = imm12:imm4; if cond != '1110' then UNPREDICTABLE; // BKPT must be encoded with AL condition

If cond != '1110', then one of the following behaviors must occur:

15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
1	0	1	1	1	1	1	0	imm8

constant imm16 = ZeroExtend(imm8, 16);

For more information about the constrained unpredictable behavior of this instruction, see Architectural Constraints on UNPREDICTABLE behaviors.

<q>	See Standard assembler syntax fields. A BKPT instruction must be unconditional.

<imm>	For encoding A1: is a 16-bit unsigned immediate, in the range 0 to 65535, encoded in the "imm12:imm4" field. This value: Is recorded in the Comment field of ESR_ELx.ISS if the Software Breakpoint Instruction exception is taken to an exception level that is using AArch64. Is ignored otherwise.
	For encoding T1: is a 8-bit unsigned immediate, in the range 0 to 255, encoded in the "imm8" field. This value: Is recorded in the Comment field of ESR_ELx.ISS if the Software Breakpoint Instruction exception is taken to an exception level that is using AArch64. Is ignored otherwise.

Internal version only: isa v01_31, pseudocode v2024-03_rel ; Build timestamp: 2024-03-25T10:05