elf_loader 0.15.1

A no_std-friendly ELF loader, runtime linker, and JIT linker for Rust.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76

use crate::{
    Result,
    elf::ElfRelType,
    elf::Lifecycle,
    image::{ModuleScope, RawObject},
    logging,
    relocation::{RelocHelper, RelocationArch, RelocationHandler},
};

use alloc::{boxed::Box, vec::Vec};

pub(crate) struct ObjectRelocation<Arch: RelocationArch = crate::arch::NativeArch> {
    sections: Box<[&'static [ElfRelType<Arch>]]>,
}

impl<Arch: RelocationArch> ObjectRelocation<Arch> {
    pub(crate) fn new(sections: Vec<&'static [ElfRelType<Arch>]>) -> Self {
        Self {
            sections: sections.into_boxed_slice(),
        }
    }
}

impl<D: 'static, Arch> RawObject<D, Arch>
where
    Arch: RelocationArch,
{
    pub(crate) fn relocate_impl<PreH, PostH>(
        mut self,
        scope: ModuleScope<Arch>,
        pre_handler: &PreH,
        post_handler: &PostH,
    ) -> Result<crate::image::LoadedCore<D, Arch>>
    where
        PreH: RelocationHandler<Arch> + ?Sized,
        PostH: RelocationHandler<Arch> + ?Sized,
    {
        logging::debug!("Relocating object: {}", self.core.name());

        let mut helper = RelocHelper::new(
            &self.core,
            scope,
            pre_handler,
            post_handler,
            self.core.tls_get_addr(),
            None,
        );
        for reloc in self.relocation.sections.iter() {
            for rel in *reloc {
                if !helper.handle_pre(rel)?.is_unhandled() {
                    continue;
                }
                Arch::relocate_object(&mut helper, rel, &mut self.pltgot)?;
                helper.handle_post(rel)?;
            }
        }

        let RelocHelper {
            scope,
            tls_desc_args,
            ..
        } = helper;
        unsafe {
            self.core.set_tls_desc_args(tls_desc_args);
        }

        (self.mprotect)()?;

        logging::trace!("[{}] Executing init functions", self.core.name());
        self.init.call(&Lifecycle::new(None, self.init_array));

        logging::info!("Relocation completed for {}", self.core.name());

        Ok(unsafe { crate::image::LoadedCore::from_core_deps(self.core, scope) })
    }
}