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| author | Ahmad Fatoum <a.fatoum@pengutronix.de> | 2022-10-19 15:53:22 +0200 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2022-10-24 11:03:51 +0200 |
| commit | 9f3477b0e9b3c0fec8afe196a1c0dcab7ad18b7c (patch) | |
| tree | ff31ed5fd0a2d95d2789d982abb8808ed66b191d /Makefile | |
| parent | 184f1b3ccdacc119104d1b401c6e33f78c44ed3d (diff) | |
| download | barebox-9f3477b0e9b3c0fec8afe196a1c0dcab7ad18b7c.tar.gz | |
Kbuild: disable ARM64 pointer authentication
The aarch64 cross-compiler built with Yocto's kirkstone release
configures -mbranch-protection=standard as default.
The resulting PACIASP/AUTIASP instructions are interpreted as NOPs by
existing CPUs, but they increase image size and misalign the barebox
header in ENTRY_FUNCTION(). Also on ARMv8.3+, where they serve a
purpose, we wouldn't benefit from them as we don't setup any pointer
authentication keys. Thus disable it.
The misaligned barebox header caused is_barebox_arm_head to fail,
breaking all code that verified barebox' header, like i.MX8MM
imx-usb-loader barebox-side support and barebox_update for
some ARM64 SoCs without a SoC-specific header.
Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20221019135322.2283270-1-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'Makefile')
| -rw-r--r-- | Makefile | 5 |
1 files changed, 5 insertions, 0 deletions
@@ -659,6 +659,11 @@ KBUILD_CFLAGS += $(call cc-option,-fno-stack-check) # Platforms that have their setjmp appropriately implemented may override this KBUILD_CFLAGS += $(call cc-option,-fcf-protection=none) +# We don't have the necessary infrastructure to benefit from ARMv8.3+ pointer +# authentication. On older CPUs, they are interpreted as NOPs and blot the +# code and break less portable code that expects a very specific code layout +KBUILD_CFLAGS += $(call cc-option,-mbranch-protection=none) + KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) # Align the bit size of userspace programs with the kernel |