// Copyright 2016 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use super::error::{Error, Result};

pub unsafe fn syscall0(mut a: usize) -> Result<usize> {
    asm!("int 0x80"
        : "={eax}"(a)
        : "{eax}"(a)
        : "memory"
        : "intel", "volatile");

    Error::demux(a)
}

pub unsafe fn syscall1(mut a: usize, b: usize) -> Result<usize> {
    asm!("int 0x80"
        : "={eax}"(a)
        : "{eax}"(a), "{ebx}"(b)
        : "memory"
        : "intel", "volatile");

    Error::demux(a)
}

// Clobbers all registers - special for clone
pub unsafe fn syscall1_clobber(mut a: usize, b: usize) -> Result<usize> {
    asm!("int 0x80"
        : "={eax}"(a)
        : "{eax}"(a), "{ebx}"(b)
        : "memory", "ebx", "ecx", "edx", "esi", "edi"
        : "intel", "volatile");

    Error::demux(a)
}

pub unsafe fn syscall2(mut a: usize, b: usize, c: usize) -> Result<usize> {
    asm!("int 0x80"
        : "={eax}"(a)
        : "{eax}"(a), "{ebx}"(b), "{ecx}"(c)
        : "memory"
        : "intel", "volatile");

    Error::demux(a)
}

pub unsafe fn syscall3(mut a: usize, b: usize, c: usize, d: usize) -> Result<usize> {
    asm!("int 0x80"
        : "={eax}"(a)
        : "{eax}"(a), "{ebx}"(b), "{ecx}"(c), "{edx}"(d)
        : "memory"
        : "intel", "volatile");

    Error::demux(a)
}

pub unsafe fn syscall4(mut a: usize, b: usize, c: usize, d: usize, e: usize) -> Result<usize> {
    asm!("int 0x80"
        : "={eax}"(a)
        : "{eax}"(a), "{ebx}"(b), "{ecx}"(c), "{edx}"(d), "{esi}"(e)
        : "memory"
        : "intel", "volatile");

    Error::demux(a)
}

pub unsafe fn syscall5(mut a: usize, b: usize, c: usize, d: usize, e: usize, f: usize)
                       -> Result<usize> {
    asm!("int 0x80"
        : "={eax}"(a)
        : "{eax}"(a), "{ebx}"(b), "{ecx}"(c), "{edx}"(d), "{esi}"(e), "{edi}"(f)
        : "memory"
        : "intel", "volatile");

    Error::demux(a)
}
