Added convenience macro for defining host externals
This commit is contained in:
ondra05
parent
86f466cdb0
commit
0775577d31
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@ -4,135 +4,165 @@ use wasmi::{
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Signature, Trap, ValueType,
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};
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const ADD_FUNC_INDEX: usize = 0;
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const GET_TIME_INDEX: usize = 2;
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const GET_RANDOM_INDEX: usize = 3;
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const GET_INPUT_INDEX: usize = 4;
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const PRINT_CHAR: usize = 6;
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const SEND_SIGNAL_INDEX: usize = 1;
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pub struct HostExternals;
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impl HostExternals {
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fn check_signature(&self, index: usize, signature: &Signature) -> bool {
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let (params, ret_ty): (&[_], _) = match index {
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ADD_FUNC_INDEX => (&[ValueType::I32, ValueType::I32], Some(ValueType::I32)),
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SEND_SIGNAL_INDEX => (&[ValueType::I32, ValueType::I32], Some(ValueType::I32)),
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GET_TIME_INDEX => (&[], Some(ValueType::I32)),
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GET_RANDOM_INDEX => (&[], Some(ValueType::I32)),
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GET_INPUT_INDEX => (&[], Some(ValueType::I32)),
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PRINT_CHAR => (&[ValueType::I32], None),
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_ => return false,
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};
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if params.len() != signature.params().len() || ret_ty != signature.return_type() {
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false
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} else {
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params
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.iter()
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.zip(signature.params())
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.find(|(ty, param)| ty != param)
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.is_none()
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}
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}
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macro_rules! wasmi_type {
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(bool) => {
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ValueType::I32
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};
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(u8) => {
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ValueType::I32
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};
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(u16) => {
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ValueType::I32
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};
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(u32) => {
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ValueType::I32
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};
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(u64) => {
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ValueType::I64
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};
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(i8) => {
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ValueType::I32
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};
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(i16) => {
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ValueType::I32
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};
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(i32) => {
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ValueType::I32
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};
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(i64) => {
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ValueType::I64
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};
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(f32) => {
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ValueType::F32
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};
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(f64) => {
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ValueType::F64
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};
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}
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impl Externals for HostExternals {
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fn invoke_index(
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&mut self,
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index: usize,
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args: RuntimeArgs,
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) -> Result<Option<RuntimeValue>, Trap> {
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match index {
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ADD_FUNC_INDEX => {
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let a: u32 = args.nth_checked(0)?;
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let b: u32 = args.nth_checked(1)?;
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let result = a + b;
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trace!("SYSCALL: {} + {} = {}", a, b, result);
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Ok(Some(RuntimeValue::I32(result as i32)))
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}
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macro_rules! wasmi_return_type {
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() => {
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None
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};
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($type: ident) => {
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Some(wasmi_type!($type))
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};
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}
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SEND_SIGNAL_INDEX => {
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let pid: u32 = args.nth_checked(0)?;
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let signal: u32 = args.nth_checked(1)?;
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trace!("SYSCALL: send signal {} to pid {}", signal, pid);
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let ret = RuntimeValue::I32(0);
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Ok(Some(ret))
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}
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GET_TIME_INDEX => {
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use core::sync::atomic::Ordering::*;
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trace!("SYSCALL: get time");
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x86_64::instructions::interrupts::disable();
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let tick_time = kernel::TICK.load(Relaxed);
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x86_64::instructions::interrupts::enable();
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let ret = RuntimeValue::I32(tick_time.try_into().unwrap());
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Ok(Some(ret))
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}
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GET_RANDOM_INDEX => {
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trace!("SYSCALL: get random");
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let rand = generate_process_pass();
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let ret = RuntimeValue::I32(rand as i32);
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// let ret = RuntimeValue::I32(rand.try_into().unwrap());
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Ok(Some(ret))
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}
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GET_INPUT_INDEX => {
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let input = None;
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x86_64::instructions::interrupts::without_interrupts(|| KEYBUFF.lock().pop());
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if let Some(chr) = input {
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trace!("SYSCALL: input: {}", chr);
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macro_rules! host_externals {
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(
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$($index: literal: $name: ident ($($arg_name: ident: $arg_type: ident),* $(,)?) $(-> $return_type: ident)? $block: block)*
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) => {
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pub struct HostExternals;
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impl Externals for HostExternals {
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fn invoke_index(
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&mut self,
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index: usize,
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args: RuntimeArgs
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) -> Result<Option<RuntimeValue>, Trap> {
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match index {
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$(
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$index => match args.as_ref() {
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[$($arg_name),*] => {
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$(
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let $arg_name: $arg_type = (*$arg_name)
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.try_into()
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.ok_or(wasmi::TrapKind::UnexpectedSignature)?;
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)*
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$block
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},
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_ => return Err(wasmi::TrapKind::UnexpectedSignature.into()),
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}
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),*
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_ => {
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error!("Unimplemented function at {index}");
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Err(Trap::new(wasmi::TrapKind::Unreachable))
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}
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}
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let ret = RuntimeValue::I32(input.unwrap_or(0x00 as char) as i32);
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Ok(Some(ret))
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}
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PRINT_CHAR => {
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let chr: u8 = args.nth_checked(0)?;
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trace!("SYSCALL: print: {}", chr);
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print!("{}", char::from(chr));
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Ok(None)
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}
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_ => {
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error!("Unimplemented function at {}", index);
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Err(Trap::new(wasmi::TrapKind::Unreachable))
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}
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}
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}
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impl ModuleImportResolver for HostExternals {
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fn resolve_func(&self, field_name: &str, signature: &Signature) -> Result<FuncRef, Error> {
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let (index, param_types, return_type): (usize, &[ValueType], Option<ValueType>) =
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match field_name {
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$(
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stringify!($name) => (
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$index,
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&[$(wasmi_type!($arg_type)),*],
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wasmi_return_type!($($return_type)?),
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),
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)*
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_ => {
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return Err(Error::Instantiation(format!(
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"Export {field_name} not found",
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)));
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},
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};
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if !(param_types.len() != signature.params().len() || return_type != signature.return_type())
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&& param_types
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.iter()
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.zip(signature.params())
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.find(|(ty, param)| ty != param)
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.is_none()
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{
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trace!("Resolved export {field_name} at func {index}");
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Ok(FuncInstance::alloc_host(signature.clone(), index))
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} else {
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Err(Error::Instantiation(format!(
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"Export {field_name} has a bad signature {signature:?}",
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)))
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}
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}
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}
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};
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}
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impl ModuleImportResolver for HostExternals {
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fn resolve_func(&self, field_name: &str, signature: &Signature) -> Result<FuncRef, Error> {
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let index = match field_name {
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"add" => ADD_FUNC_INDEX,
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"send_signal" => SEND_SIGNAL_INDEX,
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"get_time" => GET_TIME_INDEX,
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"get_random" => GET_RANDOM_INDEX,
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"get_input" => GET_INPUT_INDEX,
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"print_char" => PRINT_CHAR,
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_ => {
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return Err(Error::Instantiation(format!(
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"Export {} not found",
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field_name
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)))
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}
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};
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host_externals! {
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0: add(a: u32, b: u32) -> u32 {
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let result = a + b;
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trace!("SYSCALL: {} + {} = {}", a, b, result);
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Ok(Some(result.into()))
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}
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if !self.check_signature(index, signature) {
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return Err(Error::Instantiation(format!(
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"Export {} has a bad signature {:?}",
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field_name, signature
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)));
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1: send_signal(pid: u32, signal: u32) -> i32 {
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trace!("SYSCALL: send signal {} to pid {}", signal, pid);
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Ok(Some(0.into()))
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}
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2: get_time() -> u32 {
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use core::sync::atomic::Ordering::*;
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trace!("SYSCALL: get time");
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x86_64::instructions::interrupts::disable();
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let tick_time = kernel::TICK.load(Relaxed);
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x86_64::instructions::interrupts::enable();
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let ret: u32 = tick_time.try_into().unwrap();
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Ok(Some(ret.into()))
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}
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3: get_random() -> i32 {
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trace!("SYSCALL: get random");
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let rand = generate_process_pass() as i32;
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Ok(Some(rand.into()))
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}
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4: get_input() -> i32 {
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let input = None;
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x86_64::instructions::interrupts::without_interrupts(|| KEYBUFF.lock().pop());
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if let Some(chr) = input {
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trace!("SYSCALL: input: {}", chr);
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}
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trace!("Resolved export {} as func {}", field_name, index);
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Ok(FuncInstance::alloc_host(signature.clone(), index))
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let ret = input.unwrap_or(0x00 as char) as i32;
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Ok(Some(ret.into()))
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}
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5: print_char(chr: u8) {
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trace!("SYSCALL: print: {}", chr);
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print!("{}", char::from(chr));
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Ok(None)
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}
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}
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