initial signal implementation

kernel-src/include/x86-64/arch/signal.h

@@ -0,0 +1,20 @@
+#ifndef _ARCH_SIGNAL_H
+#define _ARCH_SIGNAL_H
+
+#include <kernel/signal.h>
+
+#define ARCH_SIGNAL_STACK_GROWS_DOWNWARDS 1
+#define ARCH_SIGNAL_REDZONE_SIZE 128
+
+#define ARCH_SIGNAL_GETFROMRETURN(x) 
+
+typedef struct {
+	void *restorer;
+	stack_t oldstack;
+	sigset_t oldmask;
+	context_t context;
+	extracontext_t extracontext;
+	siginfo_t siginfo;
+} sigframe_t;
+
+#endif