system calls

src/include/kernel/sched.h

@@ -23,6 +23,7 @@ typedef struct _thread_t{
 	struct _thread_t* prev;
 	struct _proc_t* proc;
 	arch_regs* regs;
+	arch_extraregs extraregs;
 	state_t state;
 	void* kernelstack;
 	void* kernelstackbase;

src/include/kernel/syscalls.h

@@ -0,0 +1,11 @@
+#ifndef _SYSCALLS_H_INCLUDE
+#define _SYSCALLS_H_INCLUDE
+
+typedef struct {
+        long ret;
+        long errno;
+} syscallret;
+
+syscallret syscall_libc_log(char* str);
+
+#endif