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Erin 2023-08-07 01:50:21 +02:00 committed by ondra05
parent a2be0adefa
commit 33c0499977
1 changed files with 10 additions and 5 deletions
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15
hbvm/src/lib.rs
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@ -11,9 +11,10 @@
// - Mapped pages should be at least 4 KiB // - Mapped pages should be at least 4 KiB
#![no_std] #![no_std]
#![cfg_attr(feature = "nightly", feature(fn_align))] #![cfg_attr(feature = "nightly", feature(fn_align))]
use core::marker::PhantomData;
#[cfg(feature = "alloc")] #[cfg(feature = "alloc")]
extern crate alloc; extern crate alloc;
@ -47,11 +48,14 @@ pub struct Vm<'a, PfHandler, const TIMER_QUOTIENT: usize> {
pub pc: usize, pub pc: usize,
/// Program /// Program
program: &'a [u8], program: *const u8,
/// Cached program length (without unreachable end) /// Cached program length (without unreachable end)
program_len: usize, program_len: usize,
/// Program lifetime
_program_lt: PhantomData<&'a [u8]>,
/// Program timer /// Program timer
timer: usize, timer: usize,
@ -73,7 +77,8 @@ impl<'a, PfHandler: HandlePageFault, const TIMER_QUOTIENT: usize>
pfhandler: traph, pfhandler: traph,
pc: 0, pc: 0,
program_len: program.len() - 12, program_len: program.len() - 12,
program: &program[4..], program: program[4..].as_ptr(),
_program_lt: Default::default(),
timer: 0, timer: 0,
copier: None, copier: None,
} }
@ -121,7 +126,7 @@ impl<'a, PfHandler: HandlePageFault, const TIMER_QUOTIENT: usize>
// - Yes, we assume you run 64 bit CPU. Else ?conradluget a better CPU // - Yes, we assume you run 64 bit CPU. Else ?conradluget a better CPU
// sorry 8 bit fans, HBVM won't run on your Speccy :( // sorry 8 bit fans, HBVM won't run on your Speccy :(
unsafe { unsafe {
match *self.program.get_unchecked(self.pc) { match *self.program.add(self.pc) {
UN => { UN => {
self.decode::<()>(); self.decode::<()>();
return Err(VmRunError::Unreachable); return Err(VmRunError::Unreachable);
@ -386,7 +391,7 @@ impl<'a, PfHandler: HandlePageFault, const TIMER_QUOTIENT: usize>
/// Decode instruction operands /// Decode instruction operands
#[inline] #[inline]
unsafe fn decode<T: OpParam>(&mut self) -> T { unsafe fn decode<T: OpParam>(&mut self) -> T {
let data = self.program.as_ptr().add(self.pc + 1).cast::<T>().read(); let data = self.program.add(self.pc + 1).cast::<T>().read();
self.pc += 1 + size_of::<T>(); self.pc += 1 + size_of::<T>();
data data
} }