[Minios-devel] [UNIKRAFT PATCHv6 35/37] arch/arm64: Add function for stack pointer retrieval

[Wei Chen <wei.chen@xxxxxxx>]

The ukdebug will print bottom address of stack in
debug messages. So we just implement this function
for Arm64 to retrieve stack pointer.

Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
---
 include/uk/arch/arm/arm64/lcpu.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/uk/arch/arm/arm64/lcpu.h b/include/uk/arch/arm/arm64/lcpu.h
index 3e1fd9b..2719313 100644
--- a/include/uk/arch/arm/arm64/lcpu.h
+++ b/include/uk/arch/arm/arm64/lcpu.h
@@ -100,4 +100,13 @@ struct __regs {
 #define wmb()   dsb(st) /* Full system memory barrier store */
 #endif
 
+static inline unsigned long ukarch_read_sp(void)
+{
+       unsigned long sp;
+
+       __asm__ __volatile("mov %0, sp": "=&r"(sp));
+
+       return sp;
+}
+
 #endif /* __ASSEMBLY__ */
-- 
2.17.1


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