syscalls: Add sys_arch_prctl helper

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

include/syscall-codes.h

@@ -22,6 +22,10 @@
 #define __NR_exit		60
 #define __NR_unlink		87
 
+#define __NR__sysctl		156
+#define __NR_prctl		157
+#define __NR_arch_prctl		158
+
 #define __NR_set_thread_area	205
 #define __NR_get_thread_area	211
 

include/syscall.h

@@ -221,6 +221,10 @@ static always_inline long sys_get_thread_area(user_desc_t *info)
 	return syscall1(__NR_get_thread_area, (long)info);
 }
 
+static always_inline long sys_arch_prctl(int code, void *addr)
+{
+	return syscall2(__NR_arch_prctl, code, (unsigned long)addr);
+}
 
 #else /* CONFIG_X86_64 */
 # error x86-32 bit mode not yet implemented