[Minios-devel] [UNIKRAFT PATCH v4 5/7] arch/arm64: Don't pass -mgeneral-regs-only when CONFIG_FPSIMD is y

[Jia He <justin.he@xxxxxxx>]

Support CONFIG_FPSIMD in Unikraft app will take some overhead during
context switch. Hence still use -mgeneral-regs-only when
CONFIG_FPSIMD is 'n'

Signed-off-by: Jia He <justin.he@xxxxxxx>
Reviewed-by: Sharan Santhanam <sharan.santhanam@xxxxxxxxx>
---
 arch/arm/arm64/Makefile.uk | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/arm/arm64/Makefile.uk b/arch/arm/arm64/Makefile.uk
index 77e5204..a90305a 100644
--- a/arch/arm/arm64/Makefile.uk
+++ b/arch/arm/arm64/Makefile.uk
@@ -3,7 +3,12 @@
 # we should not enable the FP & SIMD access for kernel. As GCC will
 # the FP & SIMD registers to pass parameters, we use -mgeneral-regs-only
 # flag to force GCC to use generic registers
+ifeq ($(CONFIG_FPSIMD),y)
+ARCHFLAGS     += -D__ARM_64__
+else
 ARCHFLAGS     += -D__ARM_64__ -mgeneral-regs-only
+endif
+
 ISR_ARCHFLAGS += -D__ARM_64__ -mgeneral-regs-only
 
 # Disable FPU for trap/exception/interrupt handlers
-- 
2.17.1


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