forked from AbleOS/holey-bytes
Von-Neumann?
This commit is contained in:
parent
eadf9e0a1f
commit
430ccd170d
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@ -13,6 +13,9 @@ libfuzzer-sys = "0.4"
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[dependencies.hbvm]
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[dependencies.hbvm]
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path = ".."
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path = ".."
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[dependencies.hbbytecode]
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path = "../../hbbytecode"
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# Prevent this from interfering with workspaces
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# Prevent this from interfering with workspaces
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[workspace]
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[workspace]
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members = ["."]
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members = ["."]
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@ -1,15 +1,30 @@
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#![no_main]
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#![no_main]
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use {
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use {
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hbbytecode::valider::validate,
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hbvm::{
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hbvm::{
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mem::{HandlePageFault, Memory, MemoryAccessReason, PageSize},
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softpaging::{
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Vm,
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paging::{PageTable, Permission},
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HandlePageFault, PageSize, SoftPagedMem,
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},
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MemoryAccessReason, Vm,
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},
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},
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libfuzzer_sys::fuzz_target,
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libfuzzer_sys::fuzz_target,
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};
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};
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fuzz_target!(|data: &[u8]| {
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fuzz_target!(|data: &[u8]| {
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if let Ok(mut vm) = Vm::<_, 16384>::new_validated(data, TestTrapHandler, Default::default()) {
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if validate(data).is_ok() {
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let mut vm = unsafe {
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Vm::<_, 16384>::new(
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SoftPagedMem {
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pf_handler: TestTrapHandler,
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program: data,
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root_pt: Box::into_raw(Default::default()),
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},
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0,
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)
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};
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// Alloc and map some memory
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// Alloc and map some memory
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let pages = [
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let pages = [
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alloc_and_map(&mut vm.memory, 0),
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alloc_and_map(&mut vm.memory, 0),
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@ -26,22 +41,17 @@ fuzz_target!(|data: &[u8]| {
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}
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}
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});
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});
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fn alloc_and_map(memory: &mut Memory, at: u64) -> *mut u8 {
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fn alloc_and_map(memory: &mut SoftPagedMem<TestTrapHandler>, at: u64) -> *mut u8 {
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let ptr = Box::into_raw(Box::<Page>::default()).cast();
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let ptr = Box::into_raw(Box::<Page>::default()).cast();
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unsafe {
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unsafe {
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memory
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memory
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.map(
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.map(ptr, at, Permission::Write, PageSize::Size4K)
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ptr,
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at,
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hbvm::mem::paging::Permission::Write,
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PageSize::Size4K,
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)
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.unwrap()
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.unwrap()
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};
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};
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ptr
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ptr
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}
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}
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fn unmap_and_dealloc(memory: &mut Memory, ptr: *mut u8, from: u64) {
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fn unmap_and_dealloc(memory: &mut SoftPagedMem<TestTrapHandler>, ptr: *mut u8, from: u64) {
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memory.unmap(from).unwrap();
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memory.unmap(from).unwrap();
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let _ = unsafe { Box::from_raw(ptr.cast::<Page>()) };
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let _ = unsafe { Box::from_raw(ptr.cast::<Page>()) };
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}
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}
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@ -59,7 +69,7 @@ impl HandlePageFault for TestTrapHandler {
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fn page_fault(
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fn page_fault(
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&mut self,
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&mut self,
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_: MemoryAccessReason,
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_: MemoryAccessReason,
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_: &mut Memory,
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_: &mut PageTable,
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_: u64,
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_: u64,
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_: PageSize,
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_: PageSize,
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_: *mut u8,
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_: *mut u8,
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107
hbvm/src/lib.rs
107
hbvm/src/lib.rs
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@ -14,8 +14,6 @@
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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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#![warn(missing_docs, clippy::missing_docs_in_private_items)]
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#![warn(missing_docs, clippy::missing_docs_in_private_items)]
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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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@ -26,16 +24,14 @@ mod bmc;
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use {
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use {
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bmc::BlockCopier,
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bmc::BlockCopier,
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core::{cmp::Ordering, mem::size_of, ops},
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core::{cmp::Ordering, mem::size_of, ops, slice::SliceIndex},
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derive_more::Display,
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derive_more::Display,
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hbbytecode::{
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hbbytecode::{OpParam, ParamBB, ParamBBB, ParamBBBB, ParamBBD, ParamBBDH, ParamBBW, ParamBD},
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valider, OpParam, ParamBB, ParamBBB, ParamBBBB, ParamBBD, ParamBBDH, ParamBBW, ParamBD,
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},
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value::{Value, ValueVariant},
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value::{Value, ValueVariant},
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};
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};
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/// HoleyBytes Virtual Machine
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/// HoleyBytes Virtual Machine
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pub struct Vm<'a, Mem, const TIMER_QUOTIENT: usize> {
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pub struct Vm<Mem, const TIMER_QUOTIENT: usize> {
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/// Holds 256 registers
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/// Holds 256 registers
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///
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///
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/// Writing to register 0 is considered undefined behaviour
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/// Writing to register 0 is considered undefined behaviour
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@ -48,15 +44,6 @@ pub struct Vm<'a, Mem, const TIMER_QUOTIENT: usize> {
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/// Program counter
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/// Program counter
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pub pc: usize,
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pub pc: usize,
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/// Program
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program: *const u8,
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/// Cached program length (without unreachable end)
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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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@ -64,7 +51,7 @@ pub struct Vm<'a, Mem, const TIMER_QUOTIENT: usize> {
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copier: Option<BlockCopier>,
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copier: Option<BlockCopier>,
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}
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}
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impl<'a, Mem, const TIMER_QUOTIENT: usize> Vm<'a, Mem, TIMER_QUOTIENT>
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impl<Mem, const TIMER_QUOTIENT: usize> Vm<Mem, TIMER_QUOTIENT>
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where
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where
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Mem: Memory,
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Mem: Memory,
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{
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{
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@ -72,25 +59,16 @@ where
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///
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///
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/// # Safety
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/// # Safety
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/// Program code has to be validated
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/// Program code has to be validated
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pub unsafe fn new_unchecked(program: &'a [u8], memory: Mem) -> Self {
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pub unsafe fn new(memory: Mem, entry: u64) -> Self {
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Self {
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Self {
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registers: [Value::from(0_u64); 256],
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registers: [Value::from(0_u64); 256],
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memory,
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memory,
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pc: 0,
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pc: entry as _,
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program_len: program.len() - 12,
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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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}
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}
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/// Create a new VM with program and trap handler only if it passes validation
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pub fn new_validated(program: &'a [u8], memory: Mem) -> Result<Self, valider::Error> {
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valider::validate(program)?;
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Ok(unsafe { Self::new_unchecked(program, memory) })
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}
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/// Execute program
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/// Execute program
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///
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///
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/// Program can return [`VmRunError`] if a trap handling failed
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/// Program can return [`VmRunError`] if a trap handling failed
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@ -98,11 +76,6 @@ where
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pub fn run(&mut self) -> Result<VmRunOk, VmRunError> {
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pub fn run(&mut self) -> Result<VmRunOk, VmRunError> {
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use hbbytecode::opcode::*;
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use hbbytecode::opcode::*;
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loop {
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loop {
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// Check instruction boundary
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if self.pc >= self.program_len {
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return Err(VmRunError::AddrOutOfBounds);
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}
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// Big match
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// Big match
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//
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//
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// Contribution guide:
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// Contribution guide:
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@ -123,7 +96,11 @@ where
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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.add(self.pc) {
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match *self
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.memory
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.load_prog(self.pc)
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.ok_or(VmRunError::ProgramFetchLoadEx(self.pc as _))?
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{
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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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}
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}
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/// Decode instruction operands
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/// Decode instruction operands
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#[inline]
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#[inline(always)]
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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.add(self.pc + 1).cast::<T>().read();
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let pc1 = self.pc + 1;
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let data = self
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.memory
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.load_prog_unchecked(pc1..pc1 + size_of::<T>())
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.as_ptr()
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.cast::<T>()
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.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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/// Perform binary operating over two registers
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/// Perform binary operating over two registers
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#[inline]
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#[inline(always)]
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unsafe fn binary_op<T: ValueVariant>(&mut self, op: impl Fn(T, T) -> T) {
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unsafe fn binary_op<T: ValueVariant>(&mut self, op: impl Fn(T, T) -> T) {
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let ParamBBB(tg, a0, a1) = self.decode();
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let ParamBBB(tg, a0, a1) = self.decode();
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self.write_reg(
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self.write_reg(
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@ -406,7 +390,7 @@ where
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}
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}
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/// Perform binary operation over register and immediate
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/// Perform binary operation over register and immediate
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#[inline]
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#[inline(always)]
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unsafe fn binary_op_imm<T: ValueVariant>(&mut self, op: impl Fn(T, T) -> T) {
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unsafe fn binary_op_imm<T: ValueVariant>(&mut self, op: impl Fn(T, T) -> T) {
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let ParamBBD(tg, reg, imm) = self.decode();
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let ParamBBD(tg, reg, imm) = self.decode();
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self.write_reg(
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self.write_reg(
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@ -416,14 +400,14 @@ where
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}
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}
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/// Perform binary operation over register and shift immediate
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/// Perform binary operation over register and shift immediate
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#[inline]
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#[inline(always)]
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unsafe fn binary_op_ims<T: ValueVariant>(&mut self, op: impl Fn(T, u32) -> T) {
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unsafe fn binary_op_ims<T: ValueVariant>(&mut self, op: impl Fn(T, u32) -> T) {
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let ParamBBW(tg, reg, imm) = self.decode();
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let ParamBBW(tg, reg, imm) = self.decode();
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self.write_reg(tg, op(self.read_reg(reg).cast::<T>(), imm));
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self.write_reg(tg, op(self.read_reg(reg).cast::<T>(), imm));
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}
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}
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/// Jump at `#3` if ordering on `#0 <=> #1` is equal to expected
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/// Jump at `#3` if ordering on `#0 <=> #1` is equal to expected
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#[inline]
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#[inline(always)]
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unsafe fn cond_jmp<T: ValueVariant + Ord>(&mut self, expected: Ordering) {
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unsafe fn cond_jmp<T: ValueVariant + Ord>(&mut self, expected: Ordering) {
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let ParamBBD(a0, a1, ja) = self.decode();
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let ParamBBD(a0, a1, ja) = self.decode();
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if self
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if self
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@ -437,14 +421,14 @@ where
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}
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}
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/// Read register
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/// Read register
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#[inline]
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#[inline(always)]
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unsafe fn read_reg(&self, n: u8) -> Value {
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unsafe fn read_reg(&self, n: u8) -> Value {
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*self.registers.get_unchecked(n as usize)
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*self.registers.get_unchecked(n as usize)
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}
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}
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/// Write a register.
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/// Write a register.
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/// Writing to register 0 is no-op.
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/// Writing to register 0 is no-op.
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#[inline]
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#[inline(always)]
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unsafe fn write_reg(&mut self, n: u8, value: impl Into<Value>) {
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unsafe fn write_reg(&mut self, n: u8, value: impl Into<Value>) {
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if n != 0 {
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if n != 0 {
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*self.registers.get_unchecked_mut(n as usize) = value.into();
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*self.registers.get_unchecked_mut(n as usize) = value.into();
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@ -452,7 +436,7 @@ where
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}
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}
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/// Load / Store Address check-computation überfunction
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/// Load / Store Address check-computation überfunction
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#[inline]
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#[inline(always)]
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unsafe fn ldst_addr_uber(
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unsafe fn ldst_addr_uber(
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&self,
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&self,
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dst: u8,
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dst: u8,
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@ -485,6 +469,9 @@ pub enum VmRunError {
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/// Unhandled load access exception
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/// Unhandled load access exception
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LoadAccessEx(u64),
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LoadAccessEx(u64),
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/// Unhandled instruction load access exception
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ProgramFetchLoadEx(u64),
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/// Unhandled store access exception
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/// Unhandled store access exception
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StoreAccessEx(u64),
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StoreAccessEx(u64),
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@ -529,6 +516,40 @@ pub trait Memory {
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source: *const u8,
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source: *const u8,
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count: usize,
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count: usize,
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) -> Result<(), StoreError>;
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) -> Result<(), StoreError>;
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/// Fetch bytes from program section
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///
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/// # Why?
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/// Even Holey Bytes programs operate with
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/// single address space, the actual implementation
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/// may be different, so for these reasons there is a
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/// separate function.
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///
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/// Also if your memory implementation differentiates between
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/// readable and executable memory, this is the way to distinguish
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/// the loads.
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///
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/// # Notice for implementors
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/// This is a hot function. This is called on each opcode fetch
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/// and instruction decode. Inlining the implementation is highly
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/// recommended!
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///
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/// If you utilise some more heavy memory implementation, consider
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/// performing caching as HBVM does not do that for you.
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///
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/// Has to return all the requested data. If cannot fetch data of requested
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/// length, return [`None`].
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fn load_prog<I>(&mut self, index: I) -> Option<&I::Output>
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where
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I: SliceIndex<[u8]>;
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|
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/// Fetch bytes from program section, unchecked.
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///
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/// # Safety
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/// You really have to be sure you get the bytes, got me?
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unsafe fn load_prog_unchecked<I>(&mut self, index: I) -> &I::Output
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where
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I: SliceIndex<[u8]>;
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}
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}
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|
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/// Unhandled load access trap
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/// Unhandled load access trap
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|
|
|
@ -10,15 +10,20 @@ use {
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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fn main() -> Result<(), Box<dyn std::error::Error>> {
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let mut prog = vec![];
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let mut prog = vec![];
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stdin().read_to_end(&mut prog)?;
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stdin().read_to_end(&mut prog)?;
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println!("{prog:?}");
|
|
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|
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if let Err(e) = validate(&prog) {
|
if let Err(e) = validate(&prog) {
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eprintln!("Program validation error: {e:?}");
|
eprintln!("Program validation error: {e:?}");
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||||||
return Ok(());
|
return Ok(());
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||||||
} else {
|
} else {
|
||||||
unsafe {
|
unsafe {
|
||||||
let mut vm =
|
let mut vm = Vm::<_, 0>::new(
|
||||||
Vm::<_, 0>::new_unchecked(&prog, SoftPagedMem::<TestTrapHandler>::default());
|
SoftPagedMem {
|
||||||
|
pf_handler: TestTrapHandler,
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|
program: &prog,
|
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|
root_pt: Box::into_raw(Default::default()),
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|
},
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|
0,
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|
);
|
||||||
let data = {
|
let data = {
|
||||||
let ptr = std::alloc::alloc_zeroed(std::alloc::Layout::from_size_align_unchecked(
|
let ptr = std::alloc::alloc_zeroed(std::alloc::Layout::from_size_align_unchecked(
|
||||||
4096, 4096,
|
4096, 4096,
|
||||||
|
@ -32,7 +37,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
|
||||||
vm.memory
|
vm.memory
|
||||||
.map(
|
.map(
|
||||||
data,
|
data,
|
||||||
0,
|
8192,
|
||||||
hbvm::softpaging::paging::Permission::Write,
|
hbvm::softpaging::paging::Permission::Write,
|
||||||
PageSize::Size4K,
|
PageSize::Size4K,
|
||||||
)
|
)
|
||||||
|
@ -46,7 +51,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
|
||||||
data,
|
data,
|
||||||
std::alloc::Layout::from_size_align_unchecked(4096, 4096),
|
std::alloc::Layout::from_size_align_unchecked(4096, 4096),
|
||||||
);
|
);
|
||||||
vm.memory.unmap(0).unwrap();
|
vm.memory.unmap(8192).unwrap();
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
Ok(())
|
Ok(())
|
||||||
|
|
|
@ -4,6 +4,7 @@ pub mod paging;
|
||||||
|
|
||||||
use {
|
use {
|
||||||
super::{LoadError, Memory, MemoryAccessReason, StoreError},
|
super::{LoadError, Memory, MemoryAccessReason, StoreError},
|
||||||
|
core::slice::SliceIndex,
|
||||||
derive_more::Display,
|
derive_more::Display,
|
||||||
paging::{PageTable, Permission},
|
paging::{PageTable, Permission},
|
||||||
};
|
};
|
||||||
|
@ -13,14 +14,16 @@ use {alloc::boxed::Box, paging::PtEntry};
|
||||||
|
|
||||||
/// HoleyBytes software paged memory
|
/// HoleyBytes software paged memory
|
||||||
#[derive(Clone, Debug)]
|
#[derive(Clone, Debug)]
|
||||||
pub struct SoftPagedMem<PfHandler> {
|
pub struct SoftPagedMem<'p, PfH> {
|
||||||
/// Root page table
|
/// Root page table
|
||||||
pub root_pt: *mut PageTable,
|
pub root_pt: *mut PageTable,
|
||||||
/// Page fault handler
|
/// Page fault handler
|
||||||
pub pf_handler: PfHandler,
|
pub pf_handler: PfH,
|
||||||
|
/// Program memory segment
|
||||||
|
pub program: &'p [u8],
|
||||||
}
|
}
|
||||||
|
|
||||||
impl<PfHandler: HandlePageFault> Memory for SoftPagedMem<PfHandler> {
|
impl<'p, PfH: HandlePageFault> Memory for SoftPagedMem<'p, PfH> {
|
||||||
/// Load value from an address
|
/// Load value from an address
|
||||||
///
|
///
|
||||||
/// # Safety
|
/// # Safety
|
||||||
|
@ -57,9 +60,27 @@ impl<PfHandler: HandlePageFault> Memory for SoftPagedMem<PfHandler> {
|
||||||
)
|
)
|
||||||
.map_err(StoreError)
|
.map_err(StoreError)
|
||||||
}
|
}
|
||||||
|
|
||||||
|
/// Fetch slice from program memory section
|
||||||
|
#[inline(always)]
|
||||||
|
fn load_prog<I>(&mut self, index: I) -> Option<&I::Output>
|
||||||
|
where
|
||||||
|
I: SliceIndex<[u8]>,
|
||||||
|
{
|
||||||
|
self.program.get(index)
|
||||||
|
}
|
||||||
|
|
||||||
|
/// Fetch slice from program memory section, unchecked!
|
||||||
|
#[inline(always)]
|
||||||
|
unsafe fn load_prog_unchecked<I>(&mut self, index: I) -> &I::Output
|
||||||
|
where
|
||||||
|
I: SliceIndex<[u8]>,
|
||||||
|
{
|
||||||
|
self.program.get_unchecked(index)
|
||||||
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
impl<PfHandler: HandlePageFault> SoftPagedMem<PfHandler> {
|
impl<'p, PfH: HandlePageFault> SoftPagedMem<'p, PfH> {
|
||||||
// Everyone behold, the holy function, the god of HBVM memory accesses!
|
// Everyone behold, the holy function, the god of HBVM memory accesses!
|
||||||
|
|
||||||
/// Split address to pages, check their permissions and feed pointers with offset
|
/// Split address to pages, check their permissions and feed pointers with offset
|
||||||
|
@ -239,24 +260,14 @@ impl Iterator for AddrPageLookuper {
|
||||||
}
|
}
|
||||||
|
|
||||||
#[cfg(feature = "alloc")]
|
#[cfg(feature = "alloc")]
|
||||||
impl<PfHandler: Default> Default for SoftPagedMem<PfHandler> {
|
impl<'p, A> Drop for SoftPagedMem<'p, A> {
|
||||||
fn default() -> Self {
|
|
||||||
Self {
|
|
||||||
root_pt: Box::into_raw(Default::default()),
|
|
||||||
pf_handler: Default::default(),
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
#[cfg(feature = "alloc")]
|
|
||||||
impl<A> Drop for SoftPagedMem<A> {
|
|
||||||
fn drop(&mut self) {
|
fn drop(&mut self) {
|
||||||
let _ = unsafe { Box::from_raw(self.root_pt) };
|
let _ = unsafe { Box::from_raw(self.root_pt) };
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
#[cfg(feature = "alloc")]
|
#[cfg(feature = "alloc")]
|
||||||
impl<A> SoftPagedMem<A> {
|
impl<'p, A> SoftPagedMem<'p, A> {
|
||||||
/// Maps host's memory into VM's memory
|
/// Maps host's memory into VM's memory
|
||||||
///
|
///
|
||||||
/// # Safety
|
/// # Safety
|
||||||
|
|
Loading…
Reference in a new issue