Document Number: ARM-ECM-0359818 Non-Confidential
Version: 1.0 Page 6 of 30
processor to separate secure and non-secure memory regions, similar to the SAU.
MPU
Memory Protection Unit. Controls the permissions that privileged and unprivileged
execution modes have, memory region by memory region.
NSC region
Non-Secure Callable memory region. Secure memory that is callable by code
executing in non-secure state.
SG Secure Gateway Instruction. Switches to secure state.
TT Test Target Instruction. Used to inspect MPU, SAU, and IDAU configurations.
Entry function A function in secure memory that can be called from secure and non-secure state.
Non-secure function call A function call in secure memory that switches to non-secure state.
Secure gateway Occurrence of an SG instruction in a NSC region.
Secure gateway veneer A code sequence that provides a secure gateway to an entry function.
LSB Least Significant Bit.
A32 Instruction set previously known as ARM
®
.
T32 Instruction set previously known as Thumb
®
.
2 SCOPE
2.1 Scope
ARMv8-M Security Extensions is in some contexts known as Cortex
®
-M Security Extensions and is referred to as
CMSE throughout this document.
This document states the requirements that development tools must satisfy in order to develop software in C that
uses the feature defined by CMSE. This document describes a machine-level standard that can be mapped
directly by functions written in C and assembly language.
This document also describes the support for the new
TT instruction introduced in ARMv8-M. This instruction is
not part of CMSE, but is closely related.
Some of the requirements defined by this document will be included in future [ACLE] and [BSABI] documents.
2.2 Conventions
This document consists of informative text and requirements.
0 Requirements are numbered in the left margin and highlighted as shown here.
A permanent unique reference consists of the document number, document version, and requirement number.
3 OVERVIEW OF CMSE
3.1 Introduction
CMSE is an optional part of the ARMv8-M baseline and mainline architecture defined by [ARMV8M]. CMSE is
designed to combine code from multiple vendors without requiring trust between them. CMSE gives vendors the
ability to protect their software assets (code and data) by restricting access to the memory where their software
assets reside, except for a set of explicitly exported entry points that are defined by the vendor. This supports the
creation of a trusted software stack that provides features such as secure remote firmware updates, while
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