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The GCS support patches are based on GDB 15. Copy the GDB 14.2 recipe from meta, upgrade to 15.1, and add the patches. Signed-off-by: James McGregor <james.mcgregor2@arm.com>
Guarded Control Stack prototype =============================== To build: First, install Kas if you don't already have it: $ pip3 install --user kas Then use Kas to build an image: $ kas build --update gcs.yml To run the image inside an FVP: $ kas shell gcs.yml -c "../../scripts/runfvp --console" To run the tests automatically, Kas can be used: $ kas build --update meta-arm-gcs/gcs-test.yml Verification: On boot, the kernel should detect that the cores have GCS: CPU features: detected: Guarded Control Stack (GCS) Binaries should be tagged with PAC/BTI/GCS: $ readelf -n /bin/bash | grep AArch Properties: AArch64 feature: BTI, PAC, GCS Enabling GCS tunables shouldn't cause crashes: $ GLIBC_TUNABLES=glibc.cpu.aarch64_gcs=1:glibc.cpu.aarch64_gcs_policy=2 ls / bin boot dev etc home lib lost+found media mnt proc run sbin sys tmp usr var