Method return_error_message

kernel/src/process.rs:192–205

Modify a thread context, setting registers Note: Should only be applied to threads that will return from a syscall. If error != 0 then an error is sent along with the message Note: - RCX and R11 are used by sysret so can't be used to return data

(&self, error: usize, message: Message)

    ///  - RCX and R11 are used by sysret so can't be used
    ///    to return data
    pub fn return_error_message(&self, error: usize, message: Message) {
        let context = self.context_mut();

        let (ctrl, data1, data2, data3) = message.to_values(self);
        context.rax = ctrl as usize;
        if error != 0 {
            // Error returning a message
            context.rax |=  syscalls::SYSCALL_ERROR_CONTAINS_MESSAGE |
            (error & syscalls::SYSCALL_ERROR_MASK);
        }
        context.rdi = data1 as usize;
        context.rsi = data2 as usize;
        context.rdx = data3 as usize;
    }

    /// Return a message to the thread
    pub fn return_message(&self, message: Message) {