gcspopm

Guarded Control Stack Pop

GCSPOPM

Pops the value from the Guarded Control Stack into LR.

Pseudocode Operation

if FEAT_GCS == '0' then
  UNDEFINED
else if PSTATE.EL == EL0 then
  UNDEFINED
else
  X[30] ← GCSPop()
  PC ← X[30]

Encoding

Binary Layout

1101010100

31:22

1

21

01

20:19

011

18:16

0111

15:12

0111

11:8

001

7:5

Rt

4:0

 

Format System

Opcode 0xD52B7720

Extension FEAT_GCS (Security)

Operands

Related

More in FEAT_GCS (Security)

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0xD52B7720	GCSPOPM {<Xt>}		A64		1101010100 | 1 | 01 | 011 | 0111 | 0111 | 001 | Rt

Description

Guarded Control Stack Pop loads the 64-bit doubleword that is pointed to by the current Guarded control stack pointer, writes it to the destination register, and increments the current Guarded control stack pointer register by the size of a Guarded control stack procedure return record.