linux-unsafe 0.12.1

Raw linux system call stubs.
Documentation 
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//! Thin wrappers around the CPU instructions for making system calls on ARM.

use core::arch::asm;

/// The type of all system call arguments and return values on this platform.
pub type V = u32;

/// Call into a system function with one argument.
#[inline(always)]
pub unsafe fn syscall0(n: V) -> V {
    let ret: V;
    asm!(
        "svc 0",
        in("r7") n,
        out("r0") ret,
    );
    ret
}

/// Call into a system function with one argument.
#[inline(always)]
pub unsafe fn syscall1(n: V, a0: V) -> V {
    let ret: V;
    asm!(
        "svc 0",
        in("r7") n,
        inout("r0") a0 => ret,
    );
    ret
}

/// Call into a system function with two arguments.
#[inline(always)]
pub unsafe fn syscall2(n: V, a0: V, a1: V) -> V {
    let ret: V;
    asm!(
        "svc 0",
        in("r7") n,
        inout("r0") a0 => ret,
        in("r1") a1,
    );
    ret
}

/// Call into a system function with three arguments.
#[inline(always)]
pub unsafe fn syscall3(n: V, a0: V, a1: V, a2: V) -> V {
    let ret: V;
    asm!(
        "svc 0",
        in("r7") n,
        inout("r0") a0 => ret,
        in("r1") a1,
        in("r2") a2,
    );
    ret
}

/// Call into a system function with four arguments.
#[inline(always)]
pub unsafe fn syscall4(n: V, a0: V, a1: V, a2: V, a3: V) -> V {
    let ret: V;
    asm!(
        "svc 0",
        in("r7") n,
        inout("r0") a0 => ret,
        in("r1") a1,
        in("r2") a2,
        in("r3") a3,
    );
    ret
}

/// Call into a system function with five arguments.
#[inline(always)]
pub unsafe fn syscall5(n: V, a0: V, a1: V, a2: V, a3: V, a4: V) -> V {
    let ret: V;
    asm!(
        "svc 0",
        in("r7") n,
        inout("r0") a0 => ret,
        in("r1") a1,
        in("r2") a2,
        in("r3") a3,
        in("r4") a4,
    );
    ret
}

/// Call into a system function with six arguments.
#[inline(always)]
pub unsafe fn syscall6(n: V, a0: V, a1: V, a2: V, a3: V, a4: V, a5: V) -> V {
    let ret: V;
    asm!(
        "svc 0",
        in("r7") n,
        inout("r0") a0 => ret,
        in("r1") a1,
        in("r2") a2,
        in("r3") a3,
        in("r4") a4,
        in("r5") a5,
    );
    ret
}

/// Given a result value from a system call that follows the standard error
/// return convention for this platform, returns either the given value
/// verbatim or the kernel error code extracted from it.
///
/// For ARM, the standard way to signal an error is to return a result
/// between -4095 and -1 inclusive, with all other values representing
/// successful results.
///
/// A small number of system calls signal errors in different ways. This
/// function is not compatible with the results from those calls.
#[inline]
pub fn unpack_standard_result(raw: V) -> Result<V, i32> {
    if (raw as u64) >= ((-4095 as i64) as u64) {
        let err = -(raw as i32);
        Err(err)
    } else {
        Ok(raw)
    }
}

include!(concat!(env!("OUT_DIR"), "/syscall_nrs_arm.rs"));
pub(crate) mod errno {
    include!(concat!(env!("OUT_DIR"), "/errnos_arm.rs"));
}

// Architecture-specific types and constants
pub(crate) mod types {}