3 Sep
2024
3 Sep
'24
8:57 a.m.
On Thu, Aug 29, 2024 at 12:27:20AM +0100, Mark Brown wrote:
In preparation for adding arm64 GCS support make the map_shadow_stack() SHADOW_STACK_SET_TOKEN flag generic and add _SET_MARKER. The existing flag indicates that a token usable for stack switch should be added to the top of the newly mapped GCS region while the new flag indicates that a top of stack marker suitable for use by unwinders should be added above that.
For arm64 the top of stack marker is all bits 0.
Reviewed-by: Thiago Jung Bauermann thiago.bauermann@linaro.org Reviewed-by: Catalin Marinas catalin.marinas@arm.com Signed-off-by: Mark Brown broonie@kernel.org
Acked-by: Yury Khrustalev yury.khrustalev@arm.com