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[2/2] machine/arch-arm64: add -mbranch-protection=standard

Message ID 20230713110119.3959009-2-ross.burton@arm.com
State New
Headers show
Series [1/2] gcc: don't pass --enable-standard-branch-protection | expand

Commit Message

Ross Burton July 13, 2023, 11:01 a.m. UTC 
From: Ross Burton <ross.burton@arm.com>

Enable branch protection (PAC/BTI) for all aarch64 builds.  This was
previously enabled at a global level in the GCC build, but that breaks
the gcc test suite.

Signed-off-by: Ross Burton <ross.burton@arm.com>
---
 meta/conf/machine/include/arm/arch-arm64.inc | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

diff --git a/meta/conf/machine/include/arm/arch-arm64.inc b/meta/conf/machine/include/arm/arch-arm64.inc
index 0e2efb5a40f..832d0000acb 100644
--- a/meta/conf/machine/include/arm/arch-arm64.inc
+++ b/meta/conf/machine/include/arm/arch-arm64.inc
@@ -37,3 +37,8 @@  TUNE_ARCH = "${@bb.utils.contains('TUNE_FEATURES', 'aarch64', '${TUNE_ARCH_64}',
 TUNE_PKGARCH = "${@bb.utils.contains('TUNE_FEATURES', 'aarch64', '${TUNE_PKGARCH_64}', '${TUNE_PKGARCH_32}', d)}"
 ABIEXTENSION = "${@bb.utils.contains('TUNE_FEATURES', 'aarch64', '${ABIEXTENSION_64}', '${ABIEXTENSION_32}', d)}"
 TARGET_FPU = "${@bb.utils.contains('TUNE_FEATURES', 'aarch64', '${TARGET_FPU_64}', '${TARGET_FPU_32}', d)}"
+
+# Emit branch protection (PAC/BTI) instructions.  On hardware that doesn't
+# support these they're meaningless NOP instructions, so there's very little
+# reason not to.
+TUNE_CCARGS .= "${@bb.utils.contains('TUNE_FEATURES', 'aarch64', ' -mbranch-protection=standard', '', d)}"