feat(security): add support for SLS mitigation
This patch enables support for the gcc compiler option "-mharden-sls",
the default is not to use this option. Setting HARDEN_SLS=1 sets
"-mharden-sls=all" that enables all hardening against straight line
speculation.
Signed-off-by: Bipin Ravi <bipin.ravi@arm.com>
Change-Id: I59f5963c22431571f5aebe7e0c5642b32362f4c9
(cherry picked from commit 538516f5d3db6e2c30dfa9f0b82859389f529e78)
diff --git a/make_helpers/defaults.mk b/make_helpers/defaults.mk
index 61e9dd6..d9c6483 100644
--- a/make_helpers/defaults.mk
+++ b/make_helpers/defaults.mk
@@ -220,6 +220,10 @@
# by lower ELs.
HANDLE_EA_EL3_FIRST_NS := 0
+# Enables support for the gcc compiler option "-mharden-sls=all".
+# By default, disables all SLS hardening.
+HARDEN_SLS := 0
+
# Secure hash algorithm flag, accepts 3 values: sha256, sha384 and sha512.
# The default value is sha256.
HASH_ALG := sha256