nc 0.9.7

Access system calls directly
Documentation 
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// Copyright (c) 2020 Xu Shaohua <shaohua@biofan.org>. All rights reserved.
// Use of this source is governed by Apache-2.0 License that can be found
// in the LICENSE file.

#![allow(clippy::missing_errors_doc)]
#![allow(clippy::missing_safety_doc)]
#![allow(clippy::module_name_repetitions)]

use core::arch::asm;

use super::types::{check_errno, Errno, Sysno};

#[inline]
pub unsafe fn syscall0(n: Sysno) -> Result<usize, Errno> {
    let ret: usize;
    asm!("syscall",
        in("rax") n,
        out("rcx") _,  // clobbered by syscalls
        out("r11") _,  // clobbered by syscalls
        lateout("rax") ret,
    );
    check_errno(ret)
}

#[inline]
pub unsafe fn syscall1(n: Sysno, a1: usize) -> Result<usize, Errno> {
    let ret: usize;
    asm!("syscall",
        in("rax") n,
        in("rdi") a1,
        out("rcx") _,
        out("r11") _,
        lateout("rax") ret,
    );
    check_errno(ret)
}

#[inline]
pub unsafe fn syscall2(n: Sysno, a1: usize, a2: usize) -> Result<usize, Errno> {
    let ret: usize;
    asm!("syscall",
        in("rax") n,
        in("rdi") a1,
        in("rsi") a2,
        out("rcx") _,
        out("r11") _,
        lateout("rax") ret,
    );
    check_errno(ret)
}

#[inline]
pub unsafe fn syscall3(n: Sysno, a1: usize, a2: usize, a3: usize) -> Result<usize, Errno> {
    let ret: usize;
    asm!("syscall",
        in("rax") n,
        in("rdi") a1,
        in("rsi") a2,
        in("rdx") a3,
        out("rcx") _,
        out("r11") _,
        lateout("rax") ret,
    );
    check_errno(ret)
}

#[inline]
pub unsafe fn syscall4(
    n: Sysno,
    a1: usize,
    a2: usize,
    a3: usize,
    a4: usize,
) -> Result<usize, Errno> {
    let ret: usize;
    asm!("syscall",
        in("rax") n,
        in("rdi") a1,
        in("rsi") a2,
        in("rdx") a3,
        in("r10") a4,
        out("rcx") _,
        out("r11") _,
        lateout("rax") ret,
    );
    check_errno(ret)
}

#[inline]
pub unsafe fn syscall5(
    n: Sysno,
    a1: usize,
    a2: usize,
    a3: usize,
    a4: usize,
    a5: usize,
) -> Result<usize, Errno> {
    let ret: usize;
    asm!("syscall",
        in("rax") n,
        in("rdi") a1,
        in("rsi") a2,
        in("rdx") a3,
        in("r10") a4,
        in("r8") a5,
        out("rcx") _,
        out("r11") _,
        lateout("rax") ret,
    );
    check_errno(ret)
}

#[inline]
pub unsafe fn syscall6(
    n: Sysno,
    a1: usize,
    a2: usize,
    a3: usize,
    a4: usize,
    a5: usize,
    a6: usize,
) -> Result<usize, Errno> {
    let ret: usize;
    asm!("syscall",
        in("rax") n,
        in("rdi") a1,
        in("rsi") a2,
        in("rdx") a3,
        in("r10") a4,
        in("r8") a5,
        in("r9") a6,
        out("rcx") _,
        out("r11") _,
        lateout("rax") ret,
    );
    check_errno(ret)
}