ARM Architecture Reference Manual ARMv7-A and ARMv7-R edition

The format of the SDER is:
31
Bits [31:2] Reserved. UNK/SBZP.
SUNIDEN, bit [1]
Secure User Non-Invasive Debug ENable:
0 non-invasive debug not permitted in Secure User mode
1 non-invasive debug permitted in Secure User mode.
SUIDEN, bit [0]
Secure User Invasive Debug ENable:
0 invasive debug not permitted in Secure User mode
1 invasive debug permitted in Secure User mode.
For more information about the use of the SUNIDEN and SUIDEN bits see:
Chapter C2 Invasive Debug Authentication
Chapter C7 Non-invasive Debug Authentication.
Virtual Memory System Architecture (VMSA)
Note
Invasive and non-invasive debug in Secure privileged modes is controlled by hardware only. For more
information, see Chapter C2 Invasive Debug Authentication and Chapter C7 Non-invasive Debug
Authentication.
Accessing the SDER
UNK/SBZP
To access the SDER you read or write the CP15 registers with set to 0, set to c1, set to
c1, and set to 1. For example:
MRC p15,0,,c1,c1,1 ; Read CP15 Secure Debug Enable Register
MCR p15,0,,c1,c1,1 ; Write CP15 Secure Debug Enable Register
ARM DDI 0406B Copyright © 1996-1998, 2000, 2004-2008 ARM Limited. All rights reserved. B3-109
2
SUNIDEN
SUIDEN
1
0