1 files changed, 25 insertions, 0 deletions
diff --git a/arch/x86_64/syscall.c b/arch/x86_64/syscall.c
new file mode 100644
index 0000000..a563525
--- /dev/null
+++ b/arch/x86_64/syscall.c
@@ -0,0 +1,25 @@
+#include "arch/x86_64/processor.h"
+#include <stddef.h>
+    
+__attribute__((naked))
+void _syscall_entry(void)
+{
+    __asm__ volatile(" \
+            pushq %%r11; \
+            pushq %%rcx; \
+            swapgs; \
+            movq %%gs:%c[tcb], %%rax; \
+            movq %%rsp, %c[sp](%%rax); \
+            movq %c[ksp](%%rax), %%rsp; \
+            pushq %c[sp](%%rax); \
+            callq _syscall_handler; \
+            swapgs; \
+            popq %%rsp; \
+            popq %%rcx; \
+            popq %%r11; \
+            sysretq;"
+            ::
+            [tcb] "i"(offsetof(processor_t, tcb)),
+            [sp] "i"(offsetof(tcb_t, sp)),
+            [ksp] "i"(offsetof(tcb_t, ksp)));
+}