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use core::{mem, slice};
use core::arch::asm;
use core::ops::{Deref, DerefMut};
use super::error::{Error, Result};
macro_rules! syscall {
($($name:ident($a:ident, $($b:ident, $($c:ident, $($d:ident, $($e:ident, $($f:ident, )?)?)?)?)?);)+) => {
$(
pub unsafe fn $name(mut $a: usize, $($b: usize, $($c: usize, $($d: usize, $($e: usize, $($f: usize)?)?)?)?)?) -> Result<usize> {
asm!(
"int 0x80",
inout("eax") $a,
$(
in("ebx") $b,
$(
in("ecx") $c,
$(
in("edx") $d,
$(
in("esi") $e,
$(
in("edi") $f,
)?
)?
)?
)?
)?
options(nostack),
);
Error::demux($a)
}
)+
};
}
syscall! {
syscall0(a,);
syscall1(a, b,);
syscall2(a, b, c,);
syscall3(a, b, c, d,);
// Must be done custom because LLVM reserves ESI
//syscall4(a, b, c, d, e,);
//syscall5(a, b, c, d, e, f,);
}
pub unsafe fn syscall4(mut a: usize, b: usize, c: usize, d: usize, e: usize)
-> Result<usize> {
asm!(
"xchg esi, {e}
int 0x80
xchg esi, {e}",
e = in(reg) e,
inout("eax") a,
in("ebx") b,
in("ecx") c,
in("edx") d,
options(nostack),
);
Error::demux(a)
}
pub unsafe fn syscall5(mut a: usize, b: usize, c: usize, d: usize, e: usize, f: usize)
-> Result<usize> {
asm!(
"xchg esi, {e}
int 0x80
xchg esi, {e}",
e = in(reg) e,
inout("eax") a,
in("ebx") b,
in("ecx") c,
in("edx") d,
in("edi") f,
options(nostack),
);
Error::demux(a)
}
#[derive(Clone, Copy, Debug, Default)]
#[repr(packed)]
pub struct EnvRegisters {
pub fsbase: u32,
pub gsbase: u32,
}
impl Deref for EnvRegisters {
type Target = [u8];
fn deref(&self) -> &[u8] {
unsafe {
slice::from_raw_parts(self as *const EnvRegisters as *const u8, mem::size_of::<EnvRegisters>())
}
}
}
impl DerefMut for EnvRegisters {
fn deref_mut(&mut self) -> &mut [u8] {
unsafe {
slice::from_raw_parts_mut(self as *mut EnvRegisters as *mut u8, mem::size_of::<EnvRegisters>())
}
}
}
|
