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// SPDX-FileCopyrightText: edef <edef@unfathomable.blue>
// SPDX-License-Identifier: OSL-3.0
#[cfg(test)]
use std::fmt::{self, Debug};
#[cfg(test)]
pub(crate) fn libc_check<T: Debug + Eq + fmt::LowerHex>(
item: &'static str,
(our_name, our_value): (&'static str, T),
(libc_name, libc_value): (&'static str, T),
) {
match () {
_ if libc_name.ends_with(our_name) => {}
_ if libc_name.starts_with(&format!("{our_name}_")) => {}
() => panic!("{libc_name} doesn't match {our_name}"),
}
assert!(
our_value == libc_value,
"{item}::{our_name} ({our_value:#x}) != libc::{libc_name} ({libc_value:#x})",
);
}
#[macro_export]
macro_rules! syscall_bitflags {
(
$(
struct $BitFlags:ident: $T:ty {
$(
const $FLAG:ident = $value:expr => $LIBC_FLAG:ident;
)*
}
)*
) => {
#[test]
fn verify_syscall_bitflags() {
$(
$BitFlags::verify();
)*
}
$(
$crate::bitflags! {
pub(crate) struct $BitFlags: $T {
$(
const $FLAG = $value;
)*
}
}
impl $BitFlags {
#[cfg(test)]
fn verify() {
$(
$crate::syscall_abi::macros::libc_check(
stringify!($BitFlags),
(stringify!($FLAG), Self::$FLAG.bits()),
(stringify!($LIBC_FLAG), $crate::libc::$LIBC_FLAG)
);
)*
}
}
impl $crate::syscall_abi::SyscallArg for $BitFlags {
fn try_from_reg(reg: u64) -> Option<Self> {
$crate::syscall_abi::SyscallArg::try_from_reg(reg).and_then(Self::from_bits)
}
}
)*
};
}
#[macro_export]
macro_rules! syscall_enums {
(
$(
enum $Enum:ident: $T:ty {
$(
$VARIANT:ident = $value:literal $(=> $LIBC_VALUE:ident)?,
)*
}
)*
) => {
#[test]
fn verify_syscall_enums() {
$(
$Enum::verify();
)*
}
$(
#[derive(Debug, Copy, Clone, Eq, PartialEq)]
#[allow(non_camel_case_types)]
pub(crate) enum $Enum {
$($VARIANT = $value),*
}
impl $crate::syscall_abi::SyscallArg for $Enum {
fn try_from_reg(reg: u64) -> Option<Self> {
let reg = <$T as $crate::syscall_abi::SyscallArg>::try_from_reg(reg)?;
Some(match reg {
$(
$value => $Enum::$VARIANT,
)*
_ => return None
})
}
}
impl $Enum {
#[cfg(test)]
fn verify() {
$(
$(
$crate::syscall_abi::macros::libc_check(
stringify!($Enum),
(stringify!($VARIANT), Self::$VARIANT as $T),
(stringify!($LIBC_VALUE), $crate::libc::$LIBC_VALUE)
);
)?
)*
}
}
)*
};
}
#[macro_export]
macro_rules! define_syscalls {
(enum $SyscallEntry:ident {
$(fn $syscall:ident ( $($arg:ident : $Arg:ty),* ) -> $Ret:ty = $nr:literal ;)*
}) => {
#[derive(Debug, Clone)]
#[allow(non_camel_case_types)]
// TODO(edef): re-enable dead_code lint when we start fully interpreting syscall args
#[allow(dead_code)]
pub(crate) enum $SyscallEntry {
$($syscall {
$($arg : $Arg),*
}),*
}
impl $SyscallEntry {
pub(crate) fn from_regs(process: &Process, regs: $crate::libc::user_regs_struct) -> anyhow::Result<$SyscallEntry> {
use anyhow::bail;
Ok(match (regs.orig_rax, [regs.rdi, regs.rsi, regs.rdx, regs.r10, regs.r8, regs.r9]) {
$(
($nr, [$($arg,)* ..]) => $SyscallEntry::$syscall {
$($arg: match ProcessSyscallArg::try_from_process_reg(process, $arg) {
Some(x) => x,
None => bail!("couldn't parse {}(2) {}: {:#08x}", stringify!($syscall), stringify!($arg), $arg)
}),*
},
)*
(n, _) => bail!("unknown syscall number {n}")
})
}
}
}
}
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