1 files changed, 25 insertions, 0 deletions
diff --git a/arch/x86_64/syscall_entry.c b/arch/x86_64/syscall_entry.c
new file mode 100644
index 0000000..56dedce
--- /dev/null
+++ b/arch/x86_64/syscall_entry.c
@@ -0,0 +1,25 @@
+#include "arch/processor.h"
+#include "syscall/handler.h"
+
+__attribute__((naked))
+void _syscall_entry()
+{
+    __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)));
+}