forked from AbleOS/holey-bytes
Address type, changed behaviour on address overflow
ondra05
parent
7cf1d79b6e
commit
2874369fcc
|
|
@ -3,11 +3,14 @@
|
|||
use {
|
||||
hbbytecode::valider::validate,
|
||||
hbvm::{
|
||||
mem::softpaging::{
|
||||
paging::{PageTable, Permission},
|
||||
HandlePageFault, PageSize, SoftPagedMem,
|
||||
mem::{
|
||||
softpaging::{
|
||||
paging::{PageTable, Permission},
|
||||
HandlePageFault, PageSize, SoftPagedMem,
|
||||
},
|
||||
Address, MemoryAccessReason,
|
||||
},
|
||||
MemoryAccessReason, Vm,
|
||||
Vm,
|
||||
},
|
||||
libfuzzer_sys::fuzz_target,
|
||||
};
|
||||
|
|
@ -22,7 +25,7 @@ fuzz_target!(|data: &[u8]| {
|
|||
root_pt: Box::into_raw(Default::default()),
|
||||
icache: Default::default(),
|
||||
},
|
||||
0,
|
||||
Address::new(4),
|
||||
)
|
||||
};
|
||||
|
||||
|
|
@ -32,8 +35,6 @@ fuzz_target!(|data: &[u8]| {
|
|||
alloc_and_map(&mut vm.memory, 4096),
|
||||
];
|
||||
|
||||
unsafe { vm.memory.write() };
|
||||
|
||||
// Run VM
|
||||
let _ = vm.run();
|
||||
|
||||
|
|
@ -50,14 +51,14 @@ fn alloc_and_map(memory: &mut SoftPagedMem<TestTrapHandler>, at: u64) -> *mut u8
|
|||
let ptr = Box::into_raw(Box::<Page>::default()).cast();
|
||||
unsafe {
|
||||
memory
|
||||
.map(ptr, at, Permission::Write, PageSize::Size4K)
|
||||
.map(ptr, Address::new(at), Permission::Write, PageSize::Size4K)
|
||||
.unwrap()
|
||||
};
|
||||
ptr
|
||||
}
|
||||
|
||||
fn unmap_and_dealloc(memory: &mut SoftPagedMem<TestTrapHandler>, ptr: *mut u8, from: u64) {
|
||||
memory.unmap(from).unwrap();
|
||||
memory.unmap(Address::new(from)).unwrap();
|
||||
let _ = unsafe { Box::from_raw(ptr.cast::<Page>()) };
|
||||
}
|
||||
|
||||
|
|
@ -75,7 +76,7 @@ impl HandlePageFault for TestTrapHandler {
|
|||
&mut self,
|
||||
_: MemoryAccessReason,
|
||||
_: &mut PageTable,
|
||||
_: u64,
|
||||
_: Address,
|
||||
_: PageSize,
|
||||
_: *mut u8,
|
||||
) -> bool {
|
||||
|
|
|
|||
|
|
@ -1,7 +1,8 @@
|
|||
//! Block memory copier state machine
|
||||
|
||||
use {
|
||||
super::{Memory, mem::MemoryAccessReason, VmRunError},
|
||||
super::{mem::MemoryAccessReason, Memory, VmRunError},
|
||||
crate::mem::Address,
|
||||
core::{mem::MaybeUninit, task::Poll},
|
||||
};
|
||||
|
||||
|
|
@ -15,9 +16,9 @@ struct AlignedBuf([MaybeUninit<u8>; BUF_SIZE]);
|
|||
/// State for block memory copy
|
||||
pub struct BlockCopier {
|
||||
/// Source address
|
||||
src: u64,
|
||||
src: Address,
|
||||
/// Destination address
|
||||
dst: u64,
|
||||
dst: Address,
|
||||
/// How many buffer sizes to copy?
|
||||
n_buffers: usize,
|
||||
/// …and what remainds after?
|
||||
|
|
@ -27,7 +28,7 @@ pub struct BlockCopier {
|
|||
impl BlockCopier {
|
||||
/// Construct a new one
|
||||
#[inline]
|
||||
pub fn new(src: u64, dst: u64, count: usize) -> Self {
|
||||
pub fn new(src: Address, dst: Address, count: usize) -> Self {
|
||||
Self {
|
||||
src,
|
||||
dst,
|
||||
|
|
@ -57,17 +58,8 @@ impl BlockCopier {
|
|||
}
|
||||
|
||||
// Bump source and destination address
|
||||
//
|
||||
// If we are over the address space, bail.
|
||||
match self.src.checked_add(BUF_SIZE as u64) {
|
||||
Some(n) => self.src = n,
|
||||
None => return Poll::Ready(Err(BlkCopyError::OutOfBounds)),
|
||||
};
|
||||
|
||||
match self.dst.checked_add(BUF_SIZE as u64) {
|
||||
Some(n) => self.dst = n,
|
||||
None => return Poll::Ready(Err(BlkCopyError::OutOfBounds)),
|
||||
};
|
||||
self.src += BUF_SIZE;
|
||||
self.dst += BUF_SIZE;
|
||||
|
||||
self.n_buffers -= 1;
|
||||
|
||||
|
|
@ -100,15 +92,15 @@ impl BlockCopier {
|
|||
#[inline]
|
||||
unsafe fn act(
|
||||
memory: &mut impl Memory,
|
||||
src: u64,
|
||||
dst: u64,
|
||||
src: Address,
|
||||
dst: Address,
|
||||
buf: *mut u8,
|
||||
count: usize,
|
||||
) -> Result<(), BlkCopyError> {
|
||||
// Load to buffer
|
||||
memory
|
||||
.load(src, buf, count)
|
||||
.map_err(|super::mem::LoadError(addr)| BlkCopyError::Access {
|
||||
.map_err(|super::mem::LoadError(addr)| BlkCopyError {
|
||||
access_reason: MemoryAccessReason::Load,
|
||||
addr,
|
||||
})?;
|
||||
|
|
@ -116,7 +108,7 @@ unsafe fn act(
|
|||
// Store from buffer
|
||||
memory
|
||||
.store(dst, buf, count)
|
||||
.map_err(|super::mem::StoreError(addr)| BlkCopyError::Access {
|
||||
.map_err(|super::mem::StoreError(addr)| BlkCopyError {
|
||||
access_reason: MemoryAccessReason::Store,
|
||||
addr,
|
||||
})?;
|
||||
|
|
@ -126,30 +118,18 @@ unsafe fn act(
|
|||
|
||||
/// Error occured when copying a block of memory
|
||||
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
|
||||
pub enum BlkCopyError {
|
||||
/// Memory access error
|
||||
Access {
|
||||
/// Kind of access
|
||||
access_reason: MemoryAccessReason,
|
||||
/// VM Address
|
||||
addr: u64,
|
||||
},
|
||||
/// Address out of bounds
|
||||
OutOfBounds,
|
||||
pub struct BlkCopyError {
|
||||
/// Kind of access
|
||||
access_reason: MemoryAccessReason,
|
||||
/// VM Address
|
||||
addr: Address,
|
||||
}
|
||||
|
||||
impl From<BlkCopyError> for VmRunError {
|
||||
fn from(value: BlkCopyError) -> Self {
|
||||
match value {
|
||||
BlkCopyError::Access {
|
||||
access_reason: MemoryAccessReason::Load,
|
||||
addr,
|
||||
} => Self::LoadAccessEx(addr),
|
||||
BlkCopyError::Access {
|
||||
access_reason: MemoryAccessReason::Store,
|
||||
addr,
|
||||
} => Self::StoreAccessEx(addr),
|
||||
BlkCopyError::OutOfBounds => Self::AddrOutOfBounds,
|
||||
match value.access_reason {
|
||||
MemoryAccessReason::Load => Self::LoadAccessEx(value.addr),
|
||||
MemoryAccessReason::Store => Self::StoreAccessEx(value.addr),
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -12,9 +12,9 @@
|
|||
|
||||
#![no_std]
|
||||
#![cfg_attr(feature = "nightly", feature(fn_align))]
|
||||
#![warn(missing_docs, clippy::missing_docs_in_private_items)]
|
||||
#![warn(missing_docs)]
|
||||
|
||||
use mem::Memory;
|
||||
use mem::{Memory, Address};
|
||||
|
||||
#[cfg(feature = "alloc")]
|
||||
extern crate alloc;
|
||||
|
|
@ -39,7 +39,7 @@ pub struct Vm<Mem, const TIMER_QUOTIENT: usize> {
|
|||
pub memory: Mem,
|
||||
|
||||
/// Program counter
|
||||
pub pc: usize,
|
||||
pub pc: Address,
|
||||
|
||||
/// Program timer
|
||||
timer: usize,
|
||||
|
|
@ -56,11 +56,11 @@ where
|
|||
///
|
||||
/// # Safety
|
||||
/// Program code has to be validated
|
||||
pub unsafe fn new(memory: Mem, entry: u64) -> Self {
|
||||
pub unsafe fn new(memory: Mem, entry: Address) -> Self {
|
||||
Self {
|
||||
registers: [Value::from(0_u64); 256],
|
||||
memory,
|
||||
pc: entry as _,
|
||||
pc: entry,
|
||||
timer: 0,
|
||||
copier: None,
|
||||
}
|
||||
|
|
@ -75,13 +75,13 @@ pub enum VmRunError {
|
|||
InvalidOpcode(u8),
|
||||
|
||||
/// Unhandled load access exception
|
||||
LoadAccessEx(u64),
|
||||
LoadAccessEx(Address),
|
||||
|
||||
/// Unhandled instruction load access exception
|
||||
ProgramFetchLoadEx(u64),
|
||||
ProgramFetchLoadEx(Address),
|
||||
|
||||
/// Unhandled store access exception
|
||||
StoreAccessEx(u64),
|
||||
StoreAccessEx(Address),
|
||||
|
||||
/// Register out-of-bounds access
|
||||
RegOutOfBounds,
|
||||
|
|
|
|||
|
|
@ -1,3 +1,5 @@
|
|||
use hbvm::mem::Address;
|
||||
|
||||
use {
|
||||
hbbytecode::valider::validate,
|
||||
hbvm::{
|
||||
|
|
@ -26,7 +28,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
|
|||
root_pt: Box::into_raw(Default::default()),
|
||||
icache: Default::default(),
|
||||
},
|
||||
4,
|
||||
Address::new(4),
|
||||
);
|
||||
let data = {
|
||||
let ptr = std::alloc::alloc_zeroed(std::alloc::Layout::from_size_align_unchecked(
|
||||
|
|
@ -41,7 +43,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
|
|||
vm.memory
|
||||
.map(
|
||||
data,
|
||||
8192,
|
||||
Address::new(8192),
|
||||
hbvm::mem::softpaging::paging::Permission::Write,
|
||||
PageSize::Size4K,
|
||||
)
|
||||
|
|
@ -54,7 +56,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
|
|||
data,
|
||||
std::alloc::Layout::from_size_align_unchecked(4096, 4096),
|
||||
);
|
||||
vm.memory.unmap(8192).unwrap();
|
||||
vm.memory.unmap(Address::new(8192)).unwrap();
|
||||
let _ = Box::from_raw(vm.memory.root_pt);
|
||||
}
|
||||
}
|
||||
|
|
@ -72,7 +74,7 @@ impl HandlePageFault for TestTrapHandler {
|
|||
&mut self,
|
||||
_: MemoryAccessReason,
|
||||
_: &mut PageTable,
|
||||
_: u64,
|
||||
_: Address,
|
||||
_: PageSize,
|
||||
_: *mut u8,
|
||||
) -> bool {
|
||||
|
|
|
|||
|
|
@ -0,0 +1,108 @@
|
|||
//! Virtual(?) memory address
|
||||
|
||||
use {
|
||||
core::{fmt::Debug, ops},
|
||||
derive_more::Display,
|
||||
};
|
||||
|
||||
/// Memory address
|
||||
#[derive(Clone, Copy, Display, PartialEq, Eq, PartialOrd, Ord)]
|
||||
#[display(fmt = "{_0:x}")]
|
||||
pub struct Address(u64);
|
||||
impl Address {
|
||||
/// A null address
|
||||
pub const NULL: Self = Self(0);
|
||||
|
||||
/// Saturating integer addition. Computes self + rhs, saturating at the numeric bounds instead of overflowing.
|
||||
#[inline]
|
||||
pub fn saturating_add<T: AddressOp>(self, rhs: T) -> Self {
|
||||
Self(self.0.saturating_add(rhs.cast_u64()))
|
||||
}
|
||||
|
||||
/// Saturating integer subtraction. Computes self - rhs, saturating at the numeric bounds instead of overflowing.
|
||||
#[inline]
|
||||
pub fn saturating_sub<T: AddressOp>(self, rhs: T) -> Self {
|
||||
Self(self.0.saturating_sub(rhs.cast_u64()))
|
||||
}
|
||||
|
||||
/// Cast or if smaller, truncate to [`usize`]
|
||||
pub fn truncate_usize(self) -> usize {
|
||||
self.0 as _
|
||||
}
|
||||
|
||||
/// Get inner value
|
||||
#[inline(always)]
|
||||
pub fn get(self) -> u64 {
|
||||
self.0
|
||||
}
|
||||
|
||||
/// Construct new address
|
||||
#[inline(always)]
|
||||
pub fn new(val: u64) -> Self {
|
||||
Self(val)
|
||||
}
|
||||
|
||||
/// Do something with inner value
|
||||
#[inline(always)]
|
||||
pub fn map(self, f: impl Fn(u64) -> u64) -> Self {
|
||||
Self(f(self.0))
|
||||
}
|
||||
}
|
||||
|
||||
impl<T: AddressOp> ops::Add<T> for Address {
|
||||
type Output = Self;
|
||||
|
||||
#[inline]
|
||||
fn add(self, rhs: T) -> Self::Output {
|
||||
Self(self.0.wrapping_add(rhs.cast_u64()))
|
||||
}
|
||||
}
|
||||
|
||||
impl<T: AddressOp> ops::Sub<T> for Address {
|
||||
type Output = Self;
|
||||
|
||||
#[inline]
|
||||
fn sub(self, rhs: T) -> Self::Output {
|
||||
Self(self.0.wrapping_sub(rhs.cast_u64()))
|
||||
}
|
||||
}
|
||||
|
||||
impl<T: AddressOp> ops::AddAssign<T> for Address {
|
||||
fn add_assign(&mut self, rhs: T) {
|
||||
self.0 = self.0.wrapping_add(rhs.cast_u64())
|
||||
}
|
||||
}
|
||||
|
||||
impl<T: AddressOp> ops::SubAssign<T> for Address {
|
||||
fn sub_assign(&mut self, rhs: T) {
|
||||
self.0 = self.0.wrapping_sub(rhs.cast_u64())
|
||||
}
|
||||
}
|
||||
|
||||
impl From<Address> for u64 {
|
||||
#[inline(always)]
|
||||
fn from(value: Address) -> Self {
|
||||
value.0
|
||||
}
|
||||
}
|
||||
|
||||
impl Debug for Address {
|
||||
fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
|
||||
write!(f, "[{:0x}]", self.0)
|
||||
}
|
||||
}
|
||||
|
||||
/// Can perform address operations with
|
||||
pub trait AddressOp {
|
||||
/// Cast to u64, truncating or extending
|
||||
fn cast_u64(self) -> u64;
|
||||
}
|
||||
|
||||
macro_rules! impl_address_ops(($($ty:ty),* $(,)?) => {
|
||||
$(impl AddressOp for $ty {
|
||||
#[inline(always)]
|
||||
fn cast_u64(self) -> u64 { self as _ }
|
||||
})*
|
||||
});
|
||||
|
||||
impl_address_ops!(u8, u16, u32, u64, usize);
|
||||
|
|
@ -1,16 +1,24 @@
|
|||
//! Memory implementations
|
||||
|
||||
use {derive_more::Display, hbbytecode::ProgramVal};
|
||||
|
||||
pub mod softpaging;
|
||||
|
||||
mod addr;
|
||||
|
||||
pub use addr::Address;
|
||||
use {derive_more::Display, hbbytecode::ProgramVal};
|
||||
|
||||
/// Load-store memory access
|
||||
pub trait Memory {
|
||||
/// Load data from memory on address
|
||||
///
|
||||
/// # Safety
|
||||
/// - Shall not overrun the buffer
|
||||
unsafe fn load(&mut self, addr: u64, target: *mut u8, count: usize) -> Result<(), LoadError>;
|
||||
unsafe fn load(
|
||||
&mut self,
|
||||
addr: Address,
|
||||
target: *mut u8,
|
||||
count: usize,
|
||||
) -> Result<(), LoadError>;
|
||||
|
||||
/// Store data to memory on address
|
||||
///
|
||||
|
|
@ -18,7 +26,7 @@ pub trait Memory {
|
|||
/// - Shall not overrun the buffer
|
||||
unsafe fn store(
|
||||
&mut self,
|
||||
addr: u64,
|
||||
addr: Address,
|
||||
source: *const u8,
|
||||
count: usize,
|
||||
) -> Result<(), StoreError>;
|
||||
|
|
@ -27,24 +35,24 @@ pub trait Memory {
|
|||
///
|
||||
/// # Safety
|
||||
/// - Data read have to be valid
|
||||
unsafe fn prog_read<T: ProgramVal>(&mut self, addr: u64) -> Option<T>;
|
||||
unsafe fn prog_read<T: ProgramVal>(&mut self, addr: Address) -> Option<T>;
|
||||
|
||||
/// Read from program memory to exectue
|
||||
///
|
||||
/// # Safety
|
||||
/// - You have to be really sure that these bytes are there, understand?
|
||||
unsafe fn prog_read_unchecked<T: ProgramVal>(&mut self, addr: u64) -> T;
|
||||
unsafe fn prog_read_unchecked<T: ProgramVal>(&mut self, addr: Address) -> T;
|
||||
}
|
||||
|
||||
/// Unhandled load access trap
|
||||
#[derive(Clone, Copy, Display, Debug, PartialEq, Eq)]
|
||||
#[display(fmt = "Load access error at address {_0:#x}")]
|
||||
pub struct LoadError(pub u64);
|
||||
#[display(fmt = "Load access error at address {_0}")]
|
||||
pub struct LoadError(pub Address);
|
||||
|
||||
/// Unhandled store access trap
|
||||
#[derive(Clone, Copy, Display, Debug, PartialEq, Eq)]
|
||||
#[display(fmt = "Store access error at address {_0:#x}")]
|
||||
pub struct StoreError(pub u64);
|
||||
#[display(fmt = "Store access error at address {_0}")]
|
||||
pub struct StoreError(pub Address);
|
||||
|
||||
/// Reason to access memory
|
||||
#[derive(Clone, Copy, Display, Debug, PartialEq, Eq)]
|
||||
|
|
|
|||
|
|
@ -1,5 +1,7 @@
|
|||
//! Program instruction cache
|
||||
|
||||
use crate::mem::Address;
|
||||
|
||||
use {
|
||||
super::{lookup::AddrPageLookuper, paging::PageTable, PageSize},
|
||||
core::{
|
||||
|
|
@ -12,7 +14,7 @@ use {
|
|||
#[derive(Clone, Debug)]
|
||||
pub struct ICache {
|
||||
/// Current page address base
|
||||
base: u64,
|
||||
base: Address,
|
||||
/// Curent page pointer
|
||||
data: Option<NonNull<u8>>,
|
||||
/// Current page size
|
||||
|
|
@ -24,7 +26,7 @@ pub struct ICache {
|
|||
impl Default for ICache {
|
||||
fn default() -> Self {
|
||||
Self {
|
||||
base: Default::default(),
|
||||
base: Address::NULL,
|
||||
data: Default::default(),
|
||||
size: PageSize::Size4K,
|
||||
mask: Default::default(),
|
||||
|
|
@ -37,22 +39,26 @@ impl ICache {
|
|||
///
|
||||
/// # Safety
|
||||
/// `T` should be valid to read from instruction memory
|
||||
pub(super) unsafe fn fetch<T>(&mut self, addr: u64, root_pt: *const PageTable) -> Option<T> {
|
||||
pub(super) unsafe fn fetch<T>(
|
||||
&mut self,
|
||||
addr: Address,
|
||||
root_pt: *const PageTable,
|
||||
) -> Option<T> {
|
||||
let mut ret = MaybeUninit::<T>::uninit();
|
||||
|
||||
let pbase = self
|
||||
.data
|
||||
.or_else(|| self.fetch_page(self.base.checked_add(self.size as _)?, root_pt))?;
|
||||
.or_else(|| self.fetch_page(self.base + self.size, root_pt))?;
|
||||
|
||||
// Get address base
|
||||
let base = addr & self.mask;
|
||||
let base = addr.map(|x| x & self.mask);
|
||||
|
||||
// Base not matching, fetch anew
|
||||
if base != self.base {
|
||||
self.fetch_page(base, root_pt)?;
|
||||
};
|
||||
|
||||
let offset = addr & !self.mask;
|
||||
let offset = addr.get() & !self.mask;
|
||||
let requ_size = size_of::<T>();
|
||||
|
||||
// Page overflow
|
||||
|
|
@ -66,7 +72,7 @@ impl ICache {
|
|||
|
||||
// Copy overflow
|
||||
if rem != 0 {
|
||||
let pbase = self.fetch_page(self.base.checked_add(self.size as _)?, root_pt)?;
|
||||
let pbase = self.fetch_page(self.base + self.size, root_pt)?;
|
||||
|
||||
// Unlikely, unsupported scenario
|
||||
if rem > self.size as _ {
|
||||
|
|
@ -84,7 +90,7 @@ impl ICache {
|
|||
}
|
||||
|
||||
/// Fetch a page
|
||||
unsafe fn fetch_page(&mut self, addr: u64, pt: *const PageTable) -> Option<NonNull<u8>> {
|
||||
unsafe fn fetch_page(&mut self, addr: Address, pt: *const PageTable) -> Option<NonNull<u8>> {
|
||||
let res = AddrPageLookuper::new(addr, 0, pt).next()?.ok()?;
|
||||
if !super::perm_check::executable(res.perm) {
|
||||
return None;
|
||||
|
|
@ -97,7 +103,7 @@ impl ICache {
|
|||
_ => return None,
|
||||
};
|
||||
self.data = Some(NonNull::new(res.ptr)?);
|
||||
self.base = addr & self.mask;
|
||||
self.base = addr.map(|x| x & self.mask);
|
||||
self.data
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,5 +1,7 @@
|
|||
//! Address lookup
|
||||
|
||||
use crate::mem::addr::Address;
|
||||
|
||||
use super::{
|
||||
addr_extract_index,
|
||||
paging::{PageTable, Permission},
|
||||
|
|
@ -9,7 +11,7 @@ use super::{
|
|||
/// Good result from address split
|
||||
pub struct AddrPageLookupOk {
|
||||
/// Virtual address
|
||||
pub vaddr: u64,
|
||||
pub vaddr: Address,
|
||||
|
||||
/// Pointer to the start for perform operation
|
||||
pub ptr: *mut u8,
|
||||
|
|
@ -24,7 +26,7 @@ pub struct AddrPageLookupOk {
|
|||
/// Errornous address split result
|
||||
pub struct AddrPageLookupError {
|
||||
/// Address of failure
|
||||
pub addr: u64,
|
||||
pub addr: Address,
|
||||
|
||||
/// Requested page size
|
||||
pub size: PageSize,
|
||||
|
|
@ -33,7 +35,7 @@ pub struct AddrPageLookupError {
|
|||
/// Address splitter into pages
|
||||
pub struct AddrPageLookuper {
|
||||
/// Current address
|
||||
addr: u64,
|
||||
addr: Address,
|
||||
|
||||
/// Size left
|
||||
size: usize,
|
||||
|
|
@ -45,7 +47,7 @@ pub struct AddrPageLookuper {
|
|||
impl AddrPageLookuper {
|
||||
/// Create a new page lookuper
|
||||
#[inline]
|
||||
pub const fn new(addr: u64, size: usize, pagetable: *const PageTable) -> Self {
|
||||
pub const fn new(addr: Address, size: usize, pagetable: *const PageTable) -> Self {
|
||||
Self {
|
||||
addr,
|
||||
size,
|
||||
|
|
@ -55,7 +57,7 @@ impl AddrPageLookuper {
|
|||
|
||||
/// Bump address by size X
|
||||
pub fn bump(&mut self, page_size: PageSize) {
|
||||
self.addr += page_size as u64;
|
||||
self.addr += page_size;
|
||||
self.size = self.size.saturating_sub(page_size as _);
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,5 +1,7 @@
|
|||
//! Automatic memory mapping
|
||||
|
||||
use crate::mem::addr::Address;
|
||||
|
||||
use {
|
||||
super::{
|
||||
addr_extract_index,
|
||||
|
|
@ -10,7 +12,7 @@ use {
|
|||
derive_more::Display,
|
||||
};
|
||||
|
||||
impl<'p, A, const OUT_PROG_EXEC: bool> SoftPagedMem<'p, A, OUT_PROG_EXEC> {
|
||||
impl<'p, A, const OUT_PROG_EXEC: bool> SoftPagedMem<'p, A, OUT_PROG_EXEC> {
|
||||
/// Maps host's memory into VM's memory
|
||||
///
|
||||
/// # Safety
|
||||
|
|
@ -20,7 +22,7 @@ impl<'p, A, const OUT_PROG_EXEC: bool> SoftPagedMem<'p, A, OUT_PROG_EXEC> {
|
|||
pub unsafe fn map(
|
||||
&mut self,
|
||||
host: *mut u8,
|
||||
target: u64,
|
||||
target: Address,
|
||||
perm: Permission,
|
||||
pagesize: PageSize,
|
||||
) -> Result<(), MapError> {
|
||||
|
|
@ -82,7 +84,7 @@ impl<'p, A, const OUT_PROG_EXEC: bool> SoftPagedMem<'p, A, OUT_PROG_EXEC> {
|
|||
///
|
||||
/// If errors, it only means there is no entry to unmap and in most cases
|
||||
/// just should be ignored.
|
||||
pub fn unmap(&mut self, addr: u64) -> Result<(), NothingToUnmap> {
|
||||
pub fn unmap(&mut self, addr: Address) -> Result<(), NothingToUnmap> {
|
||||
let mut current_pt = self.root_pt;
|
||||
let mut page_tables = [core::ptr::null_mut(); 5];
|
||||
|
||||
|
|
|
|||
|
|
@ -1,9 +1,5 @@
|
|||
//! Platform independent, software paged memory implementation
|
||||
|
||||
use core::mem::size_of;
|
||||
|
||||
use self::icache::ICache;
|
||||
|
||||
pub mod icache;
|
||||
pub mod lookup;
|
||||
pub mod paging;
|
||||
|
|
@ -12,7 +8,9 @@ pub mod paging;
|
|||
pub mod mapping;
|
||||
|
||||
use {
|
||||
super::{LoadError, Memory, MemoryAccessReason, StoreError},
|
||||
super::{addr::Address, LoadError, Memory, MemoryAccessReason, StoreError},
|
||||
core::mem::size_of,
|
||||
icache::ICache,
|
||||
lookup::{AddrPageLookupError, AddrPageLookupOk, AddrPageLookuper},
|
||||
paging::{PageTable, Permission},
|
||||
};
|
||||
|
|
@ -41,7 +39,12 @@ impl<'p, PfH: HandlePageFault, const OUT_PROG_EXEC: bool> Memory
|
|||
///
|
||||
/// # Safety
|
||||
/// Applies same conditions as for [`core::ptr::copy_nonoverlapping`]
|
||||
unsafe fn load(&mut self, addr: u64, target: *mut u8, count: usize) -> Result<(), LoadError> {
|
||||
unsafe fn load(
|
||||
&mut self,
|
||||
addr: Address,
|
||||
target: *mut u8,
|
||||
count: usize,
|
||||
) -> Result<(), LoadError> {
|
||||
self.memory_access(
|
||||
MemoryAccessReason::Load,
|
||||
addr,
|
||||
|
|
@ -59,7 +62,7 @@ impl<'p, PfH: HandlePageFault, const OUT_PROG_EXEC: bool> Memory
|
|||
/// Applies same conditions as for [`core::ptr::copy_nonoverlapping`]
|
||||
unsafe fn store(
|
||||
&mut self,
|
||||
addr: u64,
|
||||
addr: Address,
|
||||
source: *const u8,
|
||||
count: usize,
|
||||
) -> Result<(), StoreError> {
|
||||
|
|
@ -75,27 +78,31 @@ impl<'p, PfH: HandlePageFault, const OUT_PROG_EXEC: bool> Memory
|
|||
}
|
||||
|
||||
#[inline(always)]
|
||||
unsafe fn prog_read<T>(&mut self, addr: u64) -> Option<T> {
|
||||
if OUT_PROG_EXEC && addr as usize > self.program.len() {
|
||||
unsafe fn prog_read<T>(&mut self, addr: Address) -> Option<T> {
|
||||
if OUT_PROG_EXEC && addr.truncate_usize() > self.program.len() {
|
||||
return self.icache.fetch::<T>(addr, self.root_pt);
|
||||
}
|
||||
|
||||
let addr = addr as usize;
|
||||
let addr = addr.truncate_usize();
|
||||
self.program
|
||||
.get(addr..addr + size_of::<T>())
|
||||
.map(|x| x.as_ptr().cast::<T>().read())
|
||||
}
|
||||
|
||||
#[inline(always)]
|
||||
unsafe fn prog_read_unchecked<T>(&mut self, addr: u64) -> T {
|
||||
if OUT_PROG_EXEC && addr as usize > self.program.len() {
|
||||
unsafe fn prog_read_unchecked<T>(&mut self, addr: Address) -> T {
|
||||
if OUT_PROG_EXEC && addr.truncate_usize() > self.program.len() {
|
||||
return self
|
||||
.icache
|
||||
.fetch::<T>(addr as _, self.root_pt)
|
||||
.fetch::<T>(addr, self.root_pt)
|
||||
.unwrap_or_else(|| core::mem::zeroed());
|
||||
}
|
||||
|
||||
self.program.as_ptr().add(addr as _).cast::<T>().read()
|
||||
self.program
|
||||
.as_ptr()
|
||||
.add(addr.truncate_usize())
|
||||
.cast::<T>()
|
||||
.read()
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -110,32 +117,32 @@ impl<'p, PfH: HandlePageFault, const OUT_PROG_EXEC: bool> SoftPagedMem<'p, PfH,
|
|||
fn memory_access(
|
||||
&mut self,
|
||||
reason: MemoryAccessReason,
|
||||
src: u64,
|
||||
src: Address,
|
||||
mut dst: *mut u8,
|
||||
len: usize,
|
||||
permission_check: fn(Permission) -> bool,
|
||||
action: fn(*mut u8, *mut u8, usize),
|
||||
) -> Result<(), u64> {
|
||||
) -> Result<(), Address> {
|
||||
// Memory load from program section
|
||||
let (src, len) = if src < self.program.len() as _ {
|
||||
let (src, len) = if src.truncate_usize() < self.program.len() as _ {
|
||||
// Allow only loads
|
||||
if reason != MemoryAccessReason::Load {
|
||||
return Err(src);
|
||||
}
|
||||
|
||||
// Determine how much data to copy from here
|
||||
let to_copy = len.clamp(0, self.program.len().saturating_sub(src as _));
|
||||
let to_copy = len.clamp(0, self.program.len().saturating_sub(src.truncate_usize()));
|
||||
|
||||
// Perform action
|
||||
action(
|
||||
unsafe { self.program.as_ptr().add(src as _).cast_mut() },
|
||||
unsafe { self.program.as_ptr().add(src.truncate_usize()).cast_mut() },
|
||||
dst,
|
||||
to_copy,
|
||||
);
|
||||
|
||||
// Return shifted from what we've already copied
|
||||
(
|
||||
src.saturating_add(to_copy as _),
|
||||
src.saturating_add(to_copy as u64),
|
||||
len.saturating_sub(to_copy),
|
||||
)
|
||||
} else {
|
||||
|
|
@ -196,8 +203,9 @@ impl<'p, PfH: HandlePageFault, const OUT_PROG_EXEC: bool> SoftPagedMem<'p, PfH,
|
|||
///
|
||||
/// The level shall not be larger than 4, otherwise
|
||||
/// the output of the function is unspecified (yes, it can also panic :)
|
||||
pub fn addr_extract_index(addr: u64, lvl: u8) -> usize {
|
||||
pub fn addr_extract_index(addr: Address, lvl: u8) -> usize {
|
||||
debug_assert!(lvl <= 4);
|
||||
let addr = addr.get();
|
||||
usize::try_from((addr >> (lvl * 8 + 12)) & ((1 << 8) - 1)).expect("?conradluget a better CPU")
|
||||
}
|
||||
|
||||
|
|
@ -226,6 +234,22 @@ impl PageSize {
|
|||
}
|
||||
}
|
||||
|
||||
impl core::ops::Add<PageSize> for Address {
|
||||
type Output = Self;
|
||||
|
||||
#[inline(always)]
|
||||
fn add(self, rhs: PageSize) -> Self::Output {
|
||||
self + (rhs as u64)
|
||||
}
|
||||
}
|
||||
|
||||
impl core::ops::AddAssign<PageSize> for Address {
|
||||
#[inline(always)]
|
||||
fn add_assign(&mut self, rhs: PageSize) {
|
||||
*self = Self::new(self.get().wrapping_add(rhs as u64));
|
||||
}
|
||||
}
|
||||
|
||||
/// Permisison checks
|
||||
pub mod perm_check {
|
||||
use super::paging::Permission;
|
||||
|
|
@ -263,7 +287,7 @@ pub trait HandlePageFault {
|
|||
&mut self,
|
||||
reason: MemoryAccessReason,
|
||||
pagetable: &mut PageTable,
|
||||
vaddr: u64,
|
||||
vaddr: Address,
|
||||
size: PageSize,
|
||||
dataptr: *mut u8,
|
||||
) -> bool
|
||||
|
|
|
|||
|
|
@ -2,6 +2,8 @@
|
|||
//!
|
||||
//! Have fun
|
||||
|
||||
use crate::mem::Address;
|
||||
|
||||
use {
|
||||
super::{
|
||||
bmc::BlockCopier,
|
||||
|
|
@ -202,8 +204,8 @@ where
|
|||
self.pc -= size_of::<ParamBBD>() + 1;
|
||||
|
||||
self.copier = Some(BlockCopier::new(
|
||||
self.read_reg(src).cast(),
|
||||
self.read_reg(dst).cast(),
|
||||
Address::new(self.read_reg(src).cast()),
|
||||
Address::new(self.read_reg(dst).cast()),
|
||||
count as _,
|
||||
));
|
||||
|
||||
|
|
@ -244,16 +246,16 @@ where
|
|||
// Jump and link. Save PC after this instruction to
|
||||
// specified register and jump to reg + offset.
|
||||
let ParamBBD(save, reg, offset) = self.decode();
|
||||
self.write_reg(save, self.pc as u64);
|
||||
self.write_reg(save, self.pc.get());
|
||||
self.pc =
|
||||
(self.read_reg(reg).cast::<u64>().saturating_add(offset)) as usize;
|
||||
Address::new(self.read_reg(reg).cast::<u64>().saturating_add(offset));
|
||||
}
|
||||
// Conditional jumps, jump only to immediates
|
||||
JEQ => self.cond_jmp::<u64>(Ordering::Equal),
|
||||
JNE => {
|
||||
let ParamBBD(a0, a1, jt) = self.decode();
|
||||
if self.read_reg(a0).cast::<u64>() != self.read_reg(a1).cast::<u64>() {
|
||||
self.pc = jt as usize;
|
||||
self.pc = Address::new(jt);
|
||||
}
|
||||
}
|
||||
JLT => self.cond_jmp::<u64>(Ordering::Less),
|
||||
|
|
@ -317,7 +319,7 @@ where
|
|||
/// Decode instruction operands
|
||||
#[inline(always)]
|
||||
unsafe fn decode<T: ProgramVal>(&mut self) -> T {
|
||||
let pc1 = self.pc + 1;
|
||||
let pc1 = self.pc + 1_u64;
|
||||
let data = self.memory.prog_read_unchecked::<T>(pc1 as _);
|
||||
self.pc += 1 + size_of::<T>();
|
||||
data
|
||||
|
|
@ -360,7 +362,7 @@ where
|
|||
.cmp(&self.read_reg(a1).cast::<T>())
|
||||
== expected
|
||||
{
|
||||
self.pc = ja as usize;
|
||||
self.pc = Address::new(ja);
|
||||
}
|
||||
}
|
||||
|
||||
|
|
@ -388,7 +390,7 @@ where
|
|||
offset: u64,
|
||||
size: u16,
|
||||
adder: u8,
|
||||
) -> Result<u64, VmRunError> {
|
||||
) -> Result<Address, VmRunError> {
|
||||
let reg = dst.checked_add(adder).ok_or(VmRunError::RegOutOfBounds)?;
|
||||
|
||||
if usize::from(reg) * 8 + usize::from(size) > 2048 {
|
||||
|
|
@ -399,6 +401,7 @@ where
|
|||
.checked_add(offset)
|
||||
.and_then(|x| x.checked_add(adder.into()))
|
||||
.ok_or(VmRunError::AddrOutOfBounds)
|
||||
.map(Address::new)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue