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funny thing

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This commit is contained in:
Erin 2023-11-15 19:03:56 +01:00
parent b8432d544c
commit b84ff70014
10 changed files with 108 additions and 85 deletions
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16
hbvm/src/bmc.rs
View file

@ -43,17 +43,19 @@ impl BlockCopier {
/// - Same as for [`Memory::load`] and [`Memory::store`]
pub unsafe fn poll(&mut self, memory: &mut impl Memory) -> Poll<Result<(), BlkCopyError>> {
// Safety: Assuming uninit of array of MaybeUninit is sound
let mut buf = AlignedBuf(MaybeUninit::uninit().assume_init());
let mut buf = AlignedBuf(unsafe { MaybeUninit::uninit().assume_init() });
// We have at least one buffer size to copy
if self.n_buffers != 0 {
if let Err(e) = act(
if let Err(e) = unsafe {
act(
memory,
self.src,
self.dst,
buf.0.as_mut_ptr().cast(),
BUF_SIZE,
) {
)
} {
return Poll::Ready(Err(e));
}
@ -73,13 +75,15 @@ impl BlockCopier {
}
if self.rem != 0 {
if let Err(e) = act(
if let Err(e) = unsafe {
act(
memory,
self.src,
self.dst,
buf.0.as_mut_ptr().cast(),
self.rem,
) {
)
} {
return Poll::Ready(Err(e));
}
}
@ -97,6 +101,7 @@ unsafe fn act(
buf: *mut u8,
count: usize,
) -> Result<(), BlkCopyError> {
unsafe {
// Load to buffer
memory
.load(src, buf, count)
@ -112,6 +117,7 @@ unsafe fn act(
access_reason: MemoryAccessReason::Store,
addr,
})?;
}
Ok(())
}

4
hbvm/src/float/aarch64.rs
View file

@ -46,7 +46,7 @@ unsafe fn set_rounding_mode(mode: RoundingMode) {
}
let fpcr: u64;
asm!("mrs {}, fpcr", out(reg) fpcr);
unsafe { asm!("mrs {}, fpcr", out(reg) fpcr) };
let fpcr = fpcr & !(0b11 << 22)
| (match mode {
@ -56,7 +56,7 @@ unsafe fn set_rounding_mode(mode: RoundingMode) {
RoundingMode::Down => 0b10,
}) << 22;
asm!("msr fpcr, {}", in(reg) fpcr);
unsafe { asm!("msr fpcr, {}", in(reg) fpcr) };
}
#[inline(always)]

2
hbvm/src/float/x86_64.rs
View file

@ -56,6 +56,7 @@ fnsdef! {
/// [`default_rounding_mode`], you have to rely on inline assembly
#[inline(always)]
unsafe fn set_rounding_mode(mode: RoundingMode) {
unsafe {
arin::_MM_SET_ROUNDING_MODE(match mode {
RoundingMode::NearestEven => return,
RoundingMode::Truncate => arin::_MM_ROUND_TOWARD_ZERO,
@ -63,6 +64,7 @@ unsafe fn set_rounding_mode(mode: RoundingMode) {
RoundingMode::Down => arin::_MM_ROUND_DOWN,
})
}
}
#[inline(always)]
fn default_rounding_mode() {

1
hbvm/src/lib.rs
View file

@ -12,6 +12,7 @@
#![no_std]
#![cfg_attr(feature = "nightly", feature(fn_align))]
#![deny(unsafe_op_in_unsafe_fn)]
#[cfg(feature = "alloc")]
extern crate alloc;

14
hbvm/src/mem/softpaging/icache.rs
View file

@ -48,14 +48,14 @@ impl ICache {
let pbase = self
.data
.or_else(|| self.fetch_page(self.base + self.size, root_pt))?;
.or_else(|| unsafe { self.fetch_page(self.base + self.size, root_pt) })?;
// Get address base
let base = addr.map(|x| x & self.mask);
// Base not matching, fetch anew
if base != self.base {
self.fetch_page(base, root_pt)?;
unsafe { self.fetch_page(base, root_pt) }?;
};
let offset = addr.get() & !self.mask;
@ -68,25 +68,27 @@ impl ICache {
let first_copy = requ_size.saturating_sub(rem);
// Copy non-overflowing part
copy_nonoverlapping(pbase.as_ptr(), ret.as_mut_ptr().cast::<u8>(), first_copy);
unsafe { copy_nonoverlapping(pbase.as_ptr(), ret.as_mut_ptr().cast::<u8>(), first_copy) };
// Copy overflow
if rem != 0 {
let pbase = self.fetch_page(self.base + self.size, root_pt)?;
let pbase = unsafe { self.fetch_page(self.base + self.size, root_pt) }?;
// Unlikely, unsupported scenario
if rem > self.size as _ {
return None;
}
unsafe {
copy_nonoverlapping(
pbase.as_ptr(),
ret.as_mut_ptr().cast::<u8>().add(first_copy),
rem,
);
)
};
}
Some(ret.assume_init())
Some(unsafe { ret.assume_init() })
}
/// Fetch a page

18
hbvm/src/mem/softpaging/mapping.rs
View file

@ -36,9 +36,11 @@ impl<'p, A, const OUT_PROG_EXEC: bool> SoftPagedMem<'p, A, OUT_PROG_EXEC> {
// Walk pagetable levels
for lvl in (lookup_depth + 1..5).rev() {
let entry = (*current_pt)
let entry = unsafe {
(*current_pt)
.table
.get_unchecked_mut(addr_extract_index(target, lvl));
.get_unchecked_mut(addr_extract_index(target, lvl))
};
let ptr = entry.ptr();
match entry.permission() {
@ -46,13 +48,13 @@ impl<'p, A, const OUT_PROG_EXEC: bool> SoftPagedMem<'p, A, OUT_PROG_EXEC> {
// No worries! Let's create one (allocates).
Permission::Empty => {
// Increase children count
(*current_pt).childen += 1;
unsafe { *current_pt }.childen += 1;
let table = Box::into_raw(Box::new(PtPointedData {
pt: PageTable::default(),
}));
core::ptr::write(entry, PtEntry::new(table, Permission::Node));
unsafe { core::ptr::write(entry, PtEntry::new(table, Permission::Node)) };
current_pt = table as _;
}
// Continue walking
@ -63,9 +65,11 @@ impl<'p, A, const OUT_PROG_EXEC: bool> SoftPagedMem<'p, A, OUT_PROG_EXEC> {
}
}
let node = (*current_pt)
let node = unsafe {
(*current_pt)
.table
.get_unchecked_mut(addr_extract_index(target, lookup_depth));
.get_unchecked_mut(addr_extract_index(target, lookup_depth))
};
// Check if node is not mapped
if node.permission() != Permission::Empty {
@ -73,8 +77,10 @@ impl<'p, A, const OUT_PROG_EXEC: bool> SoftPagedMem<'p, A, OUT_PROG_EXEC> {
}
// Write entry
unsafe {
(*current_pt).childen += 1;
core::ptr::write(node, PtEntry::new(host.cast(), perm));
}
Ok(())
}

10
hbvm/src/mem/softpaging/mod.rs
View file

@ -51,7 +51,7 @@ impl<'p, PfH: HandlePageFault, const OUT_PROG_EXEC: bool> Memory
target,
count,
perm_check::readable,
|src, dst, count| core::ptr::copy_nonoverlapping(src, dst, count),
|src, dst, count| unsafe { core::ptr::copy_nonoverlapping(src, dst, count) },
)
.map_err(LoadError)
}
@ -72,7 +72,7 @@ impl<'p, PfH: HandlePageFault, const OUT_PROG_EXEC: bool> Memory
source.cast_mut(),
count,
perm_check::writable,
|dst, src, count| core::ptr::copy_nonoverlapping(src, dst, count),
|dst, src, count| unsafe { core::ptr::copy_nonoverlapping(src, dst, count) },
)
.map_err(StoreError)
}
@ -80,16 +80,14 @@ impl<'p, PfH: HandlePageFault, const OUT_PROG_EXEC: bool> Memory
#[inline(always)]
unsafe fn prog_read<T>(&mut self, addr: Address) -> T {
if OUT_PROG_EXEC && addr.truncate_usize() > self.program.len() {
return self
.icache
.fetch::<T>(addr, self.root_pt)
return unsafe { self.icache.fetch::<T>(addr, self.root_pt) }
.unwrap_or_else(|| unsafe { core::mem::zeroed() });
}
let addr = addr.truncate_usize();
self.program
.get(addr..addr + size_of::<T>())
.map(|x| x.as_ptr().cast::<T>().read())
.map(|x| unsafe { x.as_ptr().cast::<T>().read() })
.unwrap_or_else(|| unsafe { core::mem::zeroed() })
}
}

23
hbvm/src/vmrun.rs
View file

@ -17,7 +17,8 @@ use {
macro_rules! handler {
($self:expr, |$ty:ident ($($ident:pat),* $(,)?)| $expr:expr) => {{
let $ty($($ident),*) = $self.decode::<$ty>();
#[allow(unused_unsafe)]
let $ty($($ident),*) = unsafe { $self.decode::<$ty>() };
#[allow(clippy::no_effect)] let e = $expr;
$self.bump_pc::<$ty>();
e
@ -383,7 +384,7 @@ where
/// Decode instruction operands
#[inline(always)]
unsafe fn decode<T: Copy>(&mut self) -> T {
self.memory.prog_read::<T>(self.pc + 1_u64)
unsafe { self.memory.prog_read::<T>(self.pc + 1_u64) }
}
/// Load
@ -400,6 +401,7 @@ where
_ => 0,
};
unsafe {
self.memory.load(
self.ldst_addr_uber(dst, base, offset, count, n)?,
self.registers
@ -407,7 +409,8 @@ where
.add(usize::from(dst) + usize::from(n))
.cast(),
usize::from(count).saturating_sub(n.into()),
)?;
)
}?;
Ok(())
}
@ -421,11 +424,13 @@ where
offset: u64,
count: u16,
) -> Result<(), VmRunError> {
unsafe {
self.memory.store(
self.ldst_addr_uber(dst, base, offset, count, 0)?,
self.registers.as_ptr().add(usize::from(dst)).cast(),
count.into(),
)?;
)
}?;
Ok(())
}
@ -438,7 +443,7 @@ where
/// Perform binary operating over two registers
#[inline(always)]
unsafe fn binary_op<T: ValueVariant>(&mut self, op: impl Fn(T, T) -> T) {
let OpsRRR(tg, a0, a1) = self.decode();
let OpsRRR(tg, a0, a1) = unsafe { self.decode() };
self.write_reg(
tg,
op(self.read_reg(a0).cast::<T>(), self.read_reg(a1).cast::<T>()),
@ -453,7 +458,7 @@ where
#[repr(packed)]
struct OpsRRImm<I>(OpsRR, I);
let OpsRRImm::<T>(OpsRR(tg, reg), imm) = self.decode();
let OpsRRImm::<T>(OpsRR(tg, reg), imm) = unsafe { self.decode() };
self.write_reg(tg, op(self.read_reg(reg).cast::<T>(), imm));
self.bump_pc::<OpsRRImm<T>>();
}
@ -461,7 +466,7 @@ where
/// Perform binary operation over register and shift immediate
#[inline(always)]
unsafe fn binary_op_shift<T: ValueVariant>(&mut self, op: impl Fn(T, u32) -> T) {
let OpsRRR(tg, a0, a1) = self.decode();
let OpsRRR(tg, a0, a1) = unsafe { self.decode() };
self.write_reg(
tg,
op(
@ -475,7 +480,7 @@ where
/// Perform binary operation over register and shift immediate
#[inline(always)]
unsafe fn binary_op_ims<T: ValueVariant>(&mut self, op: impl Fn(T, u32) -> T) {
let OpsRRB(tg, reg, imm) = self.decode();
let OpsRRB(tg, reg, imm) = unsafe { self.decode() };
self.write_reg(tg, op(self.read_reg(reg).cast::<T>(), imm.into()));
self.bump_pc::<OpsRRW>();
}
@ -534,7 +539,7 @@ where
/// Jump at `PC + #3` if ordering on `#0 <=> #1` is equal to expected
#[inline(always)]
unsafe fn cond_jmp<T: ValueVariant + Ord>(&mut self, expected: Ordering) {
let OpsRRP(a0, a1, ja) = self.decode();
let OpsRRP(a0, a1, ja) = unsafe { self.decode() };
if self
.read_reg(a0)
.cast::<T>()

5
hbxrt/src/main.rs
View file

@ -1,4 +1,7 @@
//! Holey Bytes Experimental Runtime
#![deny(unsafe_op_in_unsafe_fn)]
mod mem;
use {
@ -32,7 +35,6 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
eprintln!("[I] Image loaded at {ptr:p}");
// Execute program
let mut vm = unsafe { Vm::<_, 0>::new(mem::HostMemory, Address::new(ptr as u64)) };
// Memory access fault handling
@ -60,6 +62,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
)?;
}
// Execute program
let stat = loop {
match vm.run() {
Ok(VmRunOk::Breakpoint) => eprintln!(

2
hbxrt/src/mem.rs
View file

@ -26,6 +26,6 @@ impl Memory for HostMemory {
#[inline]
unsafe fn prog_read<T: Copy>(&mut self, addr: Address) -> T {
core::ptr::read(addr.get() as *const T)
unsafe { core::ptr::read(addr.get() as *const T) }
}
}