hlt

Halting Debug (Thumb)

HLT #<imm>

Enters halting debug state (Thumb encoding).

Details

Enters halting debug state (T32 encoding). The processor suspends and passes control to the debug system with a halting debug exception. The imm value is an optional 6-bit debugger-supplied breakpoint ID. This is a T32-only instruction; it generates a halting debug exception and does not resume normal execution until the debugger releases it.

Pseudocode Operation

GenerateException(HaltingDebugException); breakpoint_id ← imm

Example

HLT #16

Encoding

Binary Layout

1011101010

imm6

Format Thumb System

Opcode 0xBA80

Extension T32 (Thumb)

Operands

imm
ID

Reference (Arm AArch32 ISA)

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0x01000070	HLT{<q>} {#}<imm>		A32		cond \| 00010 \| 00 \| 0 \| imm12 \| 0111 \| imm4
0xBA80	HLT{<q>} {#}<imm>		T32		1011101010 \| imm6

Description

Halting breakpoint causes a software breakpoint to occur. Halting breakpoint is always unconditional, even inside an IT block.

Operation

EncodingSpecificOperations();
boolean is_async = FALSE;
Halt(DebugHalt_HaltInstruction, is_async);