GCC developers have been working to support the compiler-side changes for dealing with ARMv8-M Security Extensions.
New to ARMv8-M over ARMv6-M/ARMv7-M are low-overhead hardware-based security extensions with ARM TrustZone. ARM documentation on the ARMv8-M security extensions explain, "It defines a system-wide division of physical memory into Secure regions and Non-secure regions, and two system-wide security states that are enforced by hardware...
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