[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] xen/arm64: Correctly align VFP regs
On arm64, VFP instructions requires vfpregs to be 128-byte aligned. By chance, the field is already correctly aligned. In the case if someone decides to add a new field before, Xen will receive a data abort as soon as it saves/restores VFP. We are safe on arm32 as the only constraint is to be 32-byte aligned. Reported-by: Chen Baozi <baozich@xxxxxxxxx> Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx> --- I think this patch is a good candidate for backporting to Xen 4.4 --- xen/include/asm-arm/arm64/vfp.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/xen/include/asm-arm/arm64/vfp.h b/xen/include/asm-arm/arm64/vfp.h index 373f156..6ab5d36 100644 --- a/xen/include/asm-arm/arm64/vfp.h +++ b/xen/include/asm-arm/arm64/vfp.h @@ -1,9 +1,12 @@ #ifndef _ARM_ARM64_VFP_H #define _ARM_ARM64_VFP_H +/* ARM64 VFP instruction requires fpregs address to be 128-byte aligned */ +#define __vfp_aligned __attribute__((aligned(16))) + struct vfp_state { - uint64_t fpregs[64]; + uint64_t fpregs[64] __vfp_aligned; uint32_t fpcr; uint32_t fpexc32_el2; uint32_t fpsr; -- 1.7.10.4 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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