公开(公告)号：US11681636B2

公开(公告)日：2023-06-20

申请号：US16981816

申请日：2019-02-12

Applicant: Arm Limited

Inventor： Graeme Peter Barnes ,  Jasen Milov Borisov

IPC: G06F12/14 ,  G06F7/58 ,  G06F9/30 ,  G06F21/79 ,  G06F12/0842 ,  G06F12/0853 ,  G06F12/0897 ,  G06F12/1027

CPC classification number: G06F12/1441 ,  G06F7/582 ,  G06F9/3004 ,  G06F9/30076 ,  G06F9/30101 ,  G06F9/30145 ,  G06F12/0842 ,  G06F12/0853 ,  G06F12/0897 ,  G06F12/1027 ,  G06F21/79

Abstract: An apparatus has processing circuitry (4); memory access circuitry (15) to perform a guard tag check for a tag checking target address having an associated address tag, the guard tag check comprising comparing the address tag with a guard tag stored in a memory system in association with a block of one or more memory locations comprising an addressed location identified by the target address; and an instruction decoder (6) responsive to a random tag setting instruction specifying a tag setting target address, to control the processing circuitry (4) to set the address tag associated with the tag setting target address to a random tag value randomly selected from a set of candidate tag values.