elf_loader 0.15.0

A no_std-friendly ELF loader, runtime linker, and JIT linker for Rust.
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

//! x86 (32-bit / i386) ELF relocation numbering.

use elf::abi::EM_386;

use crate::arch::ArchKind;
use crate::elf::{Elf32Layout, ElfMachine, ElfRel, ElfRelocationType};
use crate::relocation::RelocationArch;

const R_386_32: u32 = 1;
const R_386_COPY: u32 = 5;
const R_386_GLOB_DAT: u32 = 6;
const R_386_JMP_SLOT: u32 = 7;
const R_386_RELATIVE: u32 = 8;
const R_386_TLS_TPOFF: u32 = 14;
const R_386_TLS_DTPMOD32: u32 = 35;
const R_386_TLS_DTPOFF32: u32 = 36;
const R_386_IRELATIVE: u32 = 42;

/// x86 (i386, 32-bit) architecture marker.
#[derive(Debug, Clone, Copy, Default)]
pub struct X86Arch;

impl RelocationArch for X86Arch {
    const KIND: ArchKind = ArchKind::X86;
    const MACHINE: ElfMachine = ElfMachine::new(EM_386);
    type Layout = Elf32Layout;
    type Relocation = ElfRel<Self::Layout>;

    const NONE: ElfRelocationType = ElfRelocationType::new(0);
    const RELATIVE: ElfRelocationType = ElfRelocationType::new(R_386_RELATIVE);
    const GOT: ElfRelocationType = ElfRelocationType::new(R_386_GLOB_DAT);
    const SYMBOLIC: ElfRelocationType = ElfRelocationType::new(R_386_32);
    const JUMP_SLOT: ElfRelocationType = ElfRelocationType::new(R_386_JMP_SLOT);
    const IRELATIVE: ElfRelocationType = ElfRelocationType::new(R_386_IRELATIVE);
    const COPY: ElfRelocationType = ElfRelocationType::new(R_386_COPY);

    const DTPMOD: ElfRelocationType = ElfRelocationType::new(R_386_TLS_DTPMOD32);
    const DTPOFF: ElfRelocationType = ElfRelocationType::new(R_386_TLS_DTPOFF32);
    const TPOFF: ElfRelocationType = ElfRelocationType::new(R_386_TLS_TPOFF);
    // x86 (32-bit) does not define a TLSDESC relocation.
    const TLSDESC: Option<ElfRelocationType> = None;

    // `true` only when this ZST is the host's relocation backend.
    const SUPPORTS_NATIVE_RUNTIME: bool = cfg!(target_arch = "x86");

    #[inline]
    fn rel_type_to_str(r_type: ElfRelocationType) -> &'static str {
        match r_type.raw() {
            R_386_32 => "R_386_32",
            R_386_GLOB_DAT => "R_386_GLOB_DAT",
            R_386_COPY => "R_386_COPY",
            R_386_JMP_SLOT => "R_386_JMP_SLOT",
            R_386_RELATIVE => "R_386_RELATIVE",
            R_386_TLS_DTPMOD32 => "R_386_TLS_DTPMOD32",
            R_386_TLS_DTPOFF32 => "R_386_TLS_DTPOFF32",
            R_386_IRELATIVE => "R_386_IRELATIVE",
            R_386_TLS_TPOFF => "R_386_TLS_TPOFF",
            _ => "UNKNOWN",
        }
    }
}

impl crate::relocation::RelocationValueProvider for X86Arch {}
impl crate::linker::scan::GotPltTarget for X86Arch {}