arch: arm: add compiler flags for PACBTI #90064
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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-protection
levels(
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 [email protected]