arch: arm: add compiler flags for PACBTI #90064
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Introduce a Kconfig choice to select Pointer Authentication and Branch Target Identification (PACBTI) features on Armv8.1-M Mainline CPUs. The available options map to supported `-mbranch-protection` levels (`standard`, `pac-ret`, `bti`, and combinations) documented at https://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html These options enable hardware-assisted control-flow integrity mechanisms on targets like Cortex-M85, and require a toolchain with PACBTI support, such as GCC 14.2 or newer. Signed-off-by: Sudan Landge <sudan.landge@arm.com>
Add Cortex-M85 under the Arm v8.1-M architecture variant column. Cortex-M85 shares feature support with Cortex-M55, including Privileged Execute Never (PXN), and additionally introduces Pointer Authentication and Branch Target Identification (PACBTI) extensions. Signed-off-by: Sudan Landge <sudan.landge@arm.com>
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Update PACBTI support for architecture variants in the features table and add a new section introducing PACBTI support/limitations. Signed-off-by: Sudan Landge <sudan.landge@arm.com>
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What is the change?
Introduce a Kconfig choice to select Pointer Authentication and Branch
Target Identification (PACBTI) features on Armv8.1-M Mainline.
The available options map to supported
-mbranch-protectionlevels(
standard,pac-ret,bti, and combinations) documented athttps://gcc.gnu.org/onlinedocs/gcc/ARM-Options.html and works on
targets like Cortex-M85, and require a toolchain with PACBTI support, such
as GCC 14.2 or newer.
Why do we need this change?
These options enable hardware-assisted control-flow integrity mechanisms to mitigate return oriented programming and jump oriented programming.
Signed-off-by: Sudan Landge sudan.landge@arm.com