syscall: Use std.math.cast instead of checked @truncate

1 files changed, 4 insertions, 5 deletions

diff --git a/src/lib/syscall.zig b/src/lib/syscall.zig
index d886360..a4c803a 100644
--- a/src/lib/syscall.zig
+++ b/src/lib/syscall.zig
@@ -84,12 +84,11 @@ pub const TerminateError = error{
 
 // terminate(pid: u16, tid: usize) !void
 fn terminate(proc: *const process.Info, trap_frame: *const trap.Frame) !void {
-    const pid: u16 = @truncate(trap_frame.general_purpose_registers[10]);
-    const tid = trap_frame.general_purpose_registers[11];
-
-    if (pid != trap_frame.general_purpose_registers[10]) {
+    const pid_wide = trap_frame.general_purpose_registers[10];
+    const pid = std.math.cast(u16, pid_wide) orelse {
         return TerminateError.PidOutOfRange;
-    }
+    };
+    const tid = trap_frame.general_purpose_registers[11];
 
     const target = process.findThread(pid, tid) orelse {
         return TerminateError.ProcessNotFound;