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rpc: enforce alignment

This commit is contained in:
occheung 2021-08-24 17:00:28 +08:00
parent de0f2d4a28
commit 8fa47b8119
1 changed files with 14 additions and 2 deletions
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16
artiq/firmware/libproto_artiq/rpc_proto.rs
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@ -5,6 +5,18 @@ use byteorder::{NativeEndian, ByteOrder};
use io::{ProtoRead, Read, Write, ProtoWrite, Error};
use self::tag::{Tag, TagIterator, split_tag};
unsafe fn align_ptr<T>(ptr: *const ()) -> *const T {
let alignment = core::mem::align_of::<T>() as isize;
let fix = (alignment - (ptr as isize) % alignment) % alignment;
((ptr as isize) + fix) as *const T
}
unsafe fn align_ptr_mut<T>(ptr: *mut ()) -> *mut T {
let alignment = core::mem::align_of::<T>() as isize;
let fix = (alignment - (ptr as isize) % alignment) % alignment;
((ptr as isize) + fix) as *mut T
}
unsafe fn recv_value<R, E>(reader: &mut R, tag: Tag, data: &mut *mut (),
alloc: &Fn(usize) -> Result<*mut (), E>)
-> Result<(), E>
@ -13,7 +25,7 @@ unsafe fn recv_value<R, E>(reader: &mut R, tag: Tag, data: &mut *mut (),
{
macro_rules! consume_value {
($ty:ty, |$ptr:ident| $map:expr) => ({
let $ptr = (*data) as *mut $ty;
let $ptr = align_ptr_mut::<$ty>(*data) as *mut $ty;
*data = $ptr.offset(1) as *mut ();
$map
})
@ -161,7 +173,7 @@ unsafe fn send_value<W>(writer: &mut W, tag: Tag, data: &mut *const ())
{
macro_rules! consume_value {
($ty:ty, |$ptr:ident| $map:expr) => ({
let $ptr = (*data) as *const $ty;
let $ptr = align_ptr::<$ty>(*data);
*data = $ptr.offset(1) as *const ();
$map
})