dynlink/compartment/
tls.rs

1use std::{alloc::Layout, ptr::NonNull};
2
3use tracing::{debug, trace};
4
5use super::Compartment;
6use crate::{
7    tls::{TlsInfo, TlsModId, TlsModule, TlsRegion},
8    DynlinkError, DynlinkErrorKind,
9};
10
11impl Compartment {
12    pub(crate) fn insert(&mut self, tm: TlsModule) -> TlsModId {
13        let prev_gen = self.tls_gen;
14        self.tls_gen += 1;
15        let prev_info = self
16            .tls_info
17            .remove(&prev_gen)
18            .unwrap_or_else(|| TlsInfo::new(self.tls_gen));
19        let mut next = prev_info.clone_to_new_gen(self.tls_gen);
20        let id = next.insert(tm);
21        self.tls_info.insert(self.tls_gen, next);
22        id
23    }
24
25    /// Advance the TLS generation count by 1.
26    pub fn advance_tls_generation(&mut self) -> u64 {
27        let tng = self.tls_gen + 1;
28        let initial = if let Some(prev) = self.tls_info.get(&self.tls_gen) {
29            prev.clone_to_new_gen(tng)
30        } else {
31            TlsInfo::new(tng)
32        };
33        self.tls_info.insert(tng, initial);
34        tng
35    }
36
37    /// Build a useable TLS region, complete with copied templates, a control block, and a dtv.
38    pub fn build_tls_region<T>(
39        &mut self,
40        tcb: T,
41        alloc: impl FnOnce(Layout) -> Option<NonNull<u8>>,
42    ) -> Result<TlsRegion, DynlinkError> {
43        let tls_info = self.tls_info.get(&self.tls_gen).ok_or_else(|| {
44            DynlinkError::new(DynlinkErrorKind::NoTLSInfo {
45                library: self.name.clone(),
46            })
47        })?;
48        let alloc_layout = tls_info
49            .allocation_layout::<T>()
50            .map_err(DynlinkErrorKind::from)?;
51        // Each compartment has its own libstd, so we can just all alloc directly.
52        let base = alloc(alloc_layout).ok_or_else(|| DynlinkErrorKind::FailedToAllocate {
53            comp: self.name.clone(),
54            layout: alloc_layout,
55        })?;
56        debug!(
57            "{}: building static TLS region (size: {}, align: {}) -> {:p}",
58            self,
59            alloc_layout.size(),
60            alloc_layout.align(),
61            base
62        );
63
64        let tls_info = self.tls_info.get(&self.tls_gen).ok_or_else(|| {
65            DynlinkError::new(DynlinkErrorKind::NoTLSInfo {
66                library: self.name.clone(),
67            })
68        })?;
69        let tls_region = tls_info.allocate(self, base, tcb);
70        trace!("{}: static TLS region: {:?}", self, tls_region);
71        tls_region
72    }
73}
dynlink/compartment/tls.rs

dynlink/compartment/
tls.rs
