[Minios-devel] [UNIKRAFT PATCH v4 2/5] arch/arm64: Define the size of callee-saved-registers for thread switch

[Jia He <justin.he@xxxxxxx>]

In thread context switch, we will save the callee-saved registers
(x19 ~ x28) and Frame Point Register and Link Register to prev's
thread stack [1]

[1] 
http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055b/IHI0055B_aapcs64.pdf

Signed-off-by: Wei Chen <wei.chen@xxxxxxx>
Signed-off-by: Jianyong Wu <jianyong.wu@xxxxxxx>
Signed-off-by: Jia He <justin.he@xxxxxxx>
---
 arch/arm/arm64/include/uk/asm/lcpu.h | 41 +++++++++++++++++++++++-----
 1 file changed, 34 insertions(+), 7 deletions(-)

diff --git a/arch/arm/arm64/include/uk/asm/lcpu.h 
b/arch/arm/arm64/include/uk/asm/lcpu.h
index 9eea746..45d1b23 100644
--- a/arch/arm/arm64/include/uk/asm/lcpu.h
+++ b/arch/arm/arm64/include/uk/asm/lcpu.h
@@ -44,32 +44,59 @@
 #define __TRAP_STACK_SIZE      288
 #define __SP_OFFSET            272
 #define __SP_EL0_OFFSET                280
+
+/*
+ * In thread context switch, we will save the callee-saved registers
+ * (x19 ~ x28) and Frame Point Register and Link Register to prev's
+ * thread stack:
+ * 
http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055b/IHI0055B_aapcs64.pdf
+ */
+#define __CALLEE_SAVED_SIZE    96
+
 #else
+
+#include <stdint.h>
+
 /*
  * Change this structure must update TRAP_STACK_SIZE at the same time.
  * This data structure must be 16-byte alignment.
  */
 struct __regs {
        /* Generic Purpose registers, from x0 ~ x29 */
-       unsigned long x[30];
+       uint64_t x[30];
 
        /* Link Register (x30) */
-       unsigned long lr;
+       uint64_t lr;
 
        /* Exception Link Register */
-       unsigned long elr_el1;
+       uint64_t elr_el1;
 
        /* Processor State Register */
-       unsigned long spsr_el1;
+       uint64_t spsr_el1;
 
        /* Exception Status Register */
-       unsigned long esr_el1;
+       uint64_t esr_el1;
 
        /* Stack Pointer */
-       unsigned long sp;
+       uint64_t sp;
 
        /* Stack Pointer from el0 */
-       unsigned long sp_el0;
+       uint64_t sp_el0;
+};
+
+/*
+ * Change this structure must update __CALLEE_SAVED_SIZE at the
+ * same time.
+ */
+struct __callee_saved_regs {
+       /* Callee-saved registers, from x19 ~ x28 */
+       uint64_t callee[10];
+
+       /* Frame Point Register (x29) */
+       uint64_t fp;
+
+       /* Link Register (x30) */
+       uint64_t lr;
 };
 
 /*
-- 
2.17.1


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