syscalls 0.8.1

A list of Linux system calls.
Documentation 
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// On s390x, the following registers are used for args 1-6:
// arg1: %r2
// arg2: %r3
// arg3: %r4
// arg4: %r5
// arg5: %r6
// arg6: %r7
//
// syscall number: %r1
// return value: %r2
//
// No other registers are clobbered. syscalls can also modify memory. With the
// `asm!()` macro, it is assumed that memory is clobbered unless the nomem
// option is specified.
use core::arch::asm;

/// Issues a raw system call with 0 arguments.
///
/// # Safety
///
/// Running a system call is inherently unsafe. It is the caller's
/// responsibility to ensure safety.
#[inline(always)]
pub unsafe fn syscall0(n: usize) -> usize {
    let mut ret: usize;
    asm!(
        "svc 0",
        out("r2") ret,
        in("r1") n,
    );
    ret
}

/// Issues a raw system call with 1 argument.
///
/// # Safety
///
/// Running a system call is inherently unsafe. It is the caller's
/// responsibility to ensure safety.
#[inline(always)]
pub unsafe fn syscall1(n: usize, arg1: usize) -> usize {
    let mut ret: usize;
    asm!(
        "svc 0",
        lateout("r2") ret,
        in("r1") n,
        in("r2") arg1,
    );
    ret
}

/// Issues a raw system call with 2 arguments.
///
/// # Safety
///
/// Running a system call is inherently unsafe. It is the caller's
/// responsibility to ensure safety.
#[inline(always)]
pub unsafe fn syscall2(n: usize, arg1: usize, arg2: usize) -> usize {
    let mut ret: usize;
    asm!(
        "svc 0",
        lateout("r2") ret,
        in("r1") n,
        in("r2") arg1,
        in("r3") arg2,
    );
    ret
}

/// Issues a raw system call with 3 arguments.
///
/// # Safety
///
/// Running a system call is inherently unsafe. It is the caller's
/// responsibility to ensure safety.
#[inline(always)]
pub unsafe fn syscall3(
    n: usize,
    arg1: usize,
    arg2: usize,
    arg3: usize,
) -> usize {
    let mut ret: usize;
    asm!(
        "svc 0",
        lateout("r2") ret,
        in("r1") n,
        in("r2") arg1,
        in("r3") arg2,
        in("r4") arg3,
    );
    ret
}

/// Issues a raw system call with 4 arguments.
///
/// # Safety
///
/// Running a system call is inherently unsafe. It is the caller's
/// responsibility to ensure safety.
#[inline(always)]
pub unsafe fn syscall4(
    n: usize,
    arg1: usize,
    arg2: usize,
    arg3: usize,
    arg4: usize,
) -> usize {
    let mut ret: usize;
    asm!(
        "svc 0",
        lateout("r2") ret,
        in("r1") n,
        in("r2") arg1,
        in("r3") arg2,
        in("r4") arg3,
        in("r5") arg4,
    );
    ret
}

/// Issues a raw system call with 5 arguments.
///
/// # Safety
///
/// Running a system call is inherently unsafe. It is the caller's
/// responsibility to ensure safety.
#[inline(always)]
pub unsafe fn syscall5(
    n: usize,
    arg1: usize,
    arg2: usize,
    arg3: usize,
    arg4: usize,
    arg5: usize,
) -> usize {
    let mut ret: usize;
    asm!(
        "svc 0",
        lateout("r2") ret,
        in("r1") n,
        in("r2") arg1,
        in("r3") arg2,
        in("r4") arg3,
        in("r5") arg4,
        in("r6") arg5,
    );
    ret
}

/// Issues a raw system call with 6 arguments.
///
/// # Safety
///
/// Running a system call is inherently unsafe. It is the caller's
/// responsibility to ensure safety.
#[inline(always)]
pub unsafe fn syscall6(
    n: usize,
    arg1: usize,
    arg2: usize,
    arg3: usize,
    arg4: usize,
    arg5: usize,
    arg6: usize,
) -> usize {
    let mut ret: usize;
    asm!(
        "svc 0",
        lateout("r2") ret,
        in("r1") n,
        in("r2") arg1,
        in("r3") arg2,
        in("r4") arg3,
        in("r5") arg4,
        in("r6") arg5,
        in("r7") arg6,
    );
    ret
}