forked from AbleOS/holey-bytes
Shrunk
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@ -11,9 +11,10 @@
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// - Mapped pages should be at least 4 KiB
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// - Mapped pages should be at least 4 KiB
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#![no_std]
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#![no_std]
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#![cfg_attr(feature = "nightly", feature(fn_align))]
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#![cfg_attr(feature = "nightly", feature(fn_align))]
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use core::marker::PhantomData;
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#[cfg(feature = "alloc")]
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#[cfg(feature = "alloc")]
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extern crate alloc;
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extern crate alloc;
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@ -47,11 +48,14 @@ pub struct Vm<'a, PfHandler, const TIMER_QUOTIENT: usize> {
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pub pc: usize,
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pub pc: usize,
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/// Program
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/// Program
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program: &'a [u8],
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program: *const u8,
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/// Cached program length (without unreachable end)
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/// Cached program length (without unreachable end)
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program_len: usize,
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program_len: usize,
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/// Program lifetime
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_program_lt: PhantomData<&'a [u8]>,
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/// Program timer
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/// Program timer
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timer: usize,
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timer: usize,
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@ -73,7 +77,8 @@ impl<'a, PfHandler: HandlePageFault, const TIMER_QUOTIENT: usize>
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pfhandler: traph,
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pfhandler: traph,
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pc: 0,
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pc: 0,
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program_len: program.len() - 12,
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program_len: program.len() - 12,
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program: &program[4..],
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program: program[4..].as_ptr(),
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_program_lt: Default::default(),
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timer: 0,
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timer: 0,
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copier: None,
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copier: None,
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}
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}
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@ -121,7 +126,7 @@ impl<'a, PfHandler: HandlePageFault, const TIMER_QUOTIENT: usize>
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// - Yes, we assume you run 64 bit CPU. Else ?conradluget a better CPU
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// - Yes, we assume you run 64 bit CPU. Else ?conradluget a better CPU
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// sorry 8 bit fans, HBVM won't run on your Speccy :(
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// sorry 8 bit fans, HBVM won't run on your Speccy :(
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unsafe {
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unsafe {
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match *self.program.get_unchecked(self.pc) {
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match *self.program.add(self.pc) {
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UN => {
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UN => {
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self.decode::<()>();
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self.decode::<()>();
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return Err(VmRunError::Unreachable);
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return Err(VmRunError::Unreachable);
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@ -386,7 +391,7 @@ impl<'a, PfHandler: HandlePageFault, const TIMER_QUOTIENT: usize>
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/// Decode instruction operands
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/// Decode instruction operands
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#[inline]
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#[inline]
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unsafe fn decode<T: OpParam>(&mut self) -> T {
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unsafe fn decode<T: OpParam>(&mut self) -> T {
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let data = self.program.as_ptr().add(self.pc + 1).cast::<T>().read();
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let data = self.program.add(self.pc + 1).cast::<T>().read();
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self.pc += 1 + size_of::<T>();
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self.pc += 1 + size_of::<T>();
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data
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data
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}
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}
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