impl sys_arch_prctl set fs

kernel/src/syscall/ctrl.rs

@@ -0,0 +1,14 @@
+use super::*;
+
+pub fn sys_arch_prctl(code: i32, addr: usize, tf: &mut TrapFrame) -> SysResult {
+    const ARCH_SET_FS: i32 = 0x1002;
+    match code {
+        #[cfg(target_arch = "x86_64")]
+        ARCH_SET_FS => {
+            info!("sys_arch_prctl: set FS to {:#x}", addr);
+            tf.fsbase = addr;
+            Ok(0)
+        }
+        _ => Err(SysError::Inval),
+    }
+}

kernel/src/syscall/mod.rs

@@ -17,11 +17,13 @@ use self::fs::*;
 use self::mem::*;
 use self::proc::*;
 use self::time::*;
+use self::ctrl::*;
 
 mod fs;
 mod mem;
 mod proc;
 mod time;
+mod ctrl;
 
 /// System call dispatcher
 pub fn syscall(id: usize, args: [usize; 6], tf: &mut TrapFrame) -> isize {
@@ -102,10 +104,7 @@ pub fn syscall(id: usize, args: [usize; 6], tf: &mut TrapFrame) -> isize {
             warn!("sys_sigaltstack is unimplemented");
             Ok(0)
         }
-        158 => {
-            warn!("sys_arch_prctl is unimplemented");
-            Ok(0)
-        }
+        158 => sys_arch_prctl(args[0] as i32, args[1], tf),
         218 => {
             warn!("sys_set_tid_address is unimplemented");
             Ok(0)