brb

Branch Record Buffer Injection

BRB <op>

Injects an entry into the Branch Record Buffer (Debug).

Pseudocode Operation

if PSTATE.EL == EL0 then
  UNDEFINED
else
  case op of
    when '0' BRBIall()
    when '1' BRBInj()

Example

BRB op

Encoding

Binary Layout

1101010100

31:22

0

21

01

20:19

001

18:16

0111

15:12

0010

11:8

op2

7:5

Rt

4:0

 

Format System

Opcode 0xD5097200

Extension FEAT_BRBE (Debug)

Operands

• op
  IALL/INJ

Related

More in FEAT_BRBE (Debug)

Reference

View in Arm A64 ISA Reference ↗ Arm A64 ISA

Instruction Forms

Encoding	Instruction		ISA		Bit pattern
0xD5097200	BRB <brb_op>{, <Xt>}		A64		1101010100 | 0 | 01 | 001 | 0111 | 0010 | op2 | Rt

Description

Branch Record Buffer. For more information, see op0==0b01, cache maintenance, TLB maintenance, and address translation instructions.