MLK-15286 arm: arm64: only use general regs

When compiling with android toolchain, there is an instruction
"str     q0, [x8],#16", but x8 is not 16bytes aligned,
this instruction will trigger sync abort.

So, following Linux kernel, only use general regs for arm64.
If not, compiler may use simd registers Q[x]. We need to avoid
using simd registers in U-Boot, because load/store Q[x] has
restriction that 128bits aligned when str/ldr.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
(cherry picked from commit 186ccd8de53f986c5913432638dfaca9bdc97e89)
(cherry picked from commit 8f3f0d339783e066f7815408949677b62e465b62)

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 5384981..22360a3 100644 (file)
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -18,7 +18,7 @@ arch-$(CONFIG_CPU_V7A)                =$(call cc-option, -march=armv7-a, \
                                 $(call cc-option, -march=armv7))
 arch-$(CONFIG_CPU_V7M)         =-march=armv7-m
 arch-$(CONFIG_CPU_V7R)         =-march=armv7-r
-arch-$(CONFIG_ARM64)           =-march=armv8-a
+arch-$(CONFIG_ARM64)           =-march=armv8-a -mgeneral-regs-only
 
 # On Tegra systems we must build SPL for the armv4 core on the device
 # but otherwise we can use the value in CONFIG_SYS_ARM_ARCH