xen: arm: make sure gcc doesn't use floating-point registers on arm64

By using -mgeneral-regs-only which is the Aarch64 equivalent to
-msoft-float.

Otherwise gcc will corrupt the d* registers, which we don't save/restore when
trapping to/from the hypervisor.

Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
Acked-by: Julien Grall <julien.grall@linaro.org>

diff --git a/xen/arch/arm/Rules.mk b/xen/arch/arm/Rules.mk
index 76b35d9bf222dd4676204f7816288df34026a03d..b5bf5cbd6697a72c4c247680a7e5ad45c85b94b5 100644 (file)
--- a/xen/arch/arm/Rules.mk
+++ b/xen/arch/arm/Rules.mk
@@ -28,6 +28,7 @@ endif
 
 ifeq ($(TARGET_SUBARCH),arm64)
 CFLAGS += -mcpu=generic
+CFLAGS += -mgeneral-regs-only # No fp registers etc
 arm32 := n
 arm64 := y
 endif