Implement exec

Implement brk

kernel/syscall/mod.rs

@@ -30,6 +30,8 @@ pub enum Call {
     Exec = 11,
     /// Get process ID
     GetPid = 20,
+    /// Set process break
+    Brk = 45,
     /// Yield to scheduler
     SchedYield = 158
 }
@@ -46,6 +48,7 @@ impl Call {
             6 => Ok(Call::Close),
             11 => Ok(Call::Exec),
             20 => Ok(Call::GetPid),
+            45 => Ok(Call::Brk),
             158 => Ok(Call::SchedYield),
             _ => Err(Error::NoCall)
         }
@@ -63,6 +66,8 @@ pub enum Error {
     NoEntry = 2,
     /// No such process
     NoProcess = 3,
+    /// Invalid executable format
+    NoExec = 8,
     /// Bad file number
     BadFile = 9,
     /// Try again
@@ -100,6 +105,7 @@ pub fn handle(a: usize, b: usize, c: usize, d: usize, e: usize, _f: usize) -> Re
         Call::Close => close(b),
         Call::Exec => exec(convert_slice(b as *const u8, c)?, convert_slice(d as *const [usize; 2], e)?),
         Call::GetPid => getpid(),
+        Call::Brk => brk(b),
         Call::SchedYield => sched_yield()
     }
 }