drps

Debug Restore PE State

DRPS

Restores state from SPSR_ELx and DLR_EL0.

Pseudocode Operation

PC ← DLR_EL0
PSTATE ← SPSR_ELx

Encoding

Binary Layout

1101011

31:25

0101

24:21

11111

20:16

000000

15:10

11111

9:5

00000

4:0

 

Format System

Opcode 0xD6BF03E0

Extension System

Operands

Related

More in System

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0xD6BF03E0	DRPS		A64		1101011 | 0101 | 11111 | 000000 | 11111 | 00000

Description

Debug restore PE state using the SPSR for the current Exception level. When executed, the PE restores PSTATE from the SPSR. The PE checks the SPSR for the current Exception level for an illegal return event. See Illegal return events from AArch64 state. This instruction is UNDEFINED at EL0. This instruction is UNDEFINED in Non-debug state. For more information on the operation of DRPS, see DRPS.

Operation

if !Halted() || PSTATE.EL == EL0 then UNDEFINED;
DRPSInstruction();