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Implement PLT relocations for SimpleJIT

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This commit is contained in:
bjorn3
2020-11-12 16:19:16 +01:00
parent eaa2c5b3c2
commit 5458473765
2 changed files with 79 additions and 6 deletions
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11
cranelift/simplejit/src/compiled_blob.rs
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@@ -15,6 +15,7 @@ impl CompiledBlob {
&self,
get_address: impl Fn(&ExternalName) -> *const u8,
get_got_entry: impl Fn(&ExternalName) -> *const u8,
get_plt_entry: impl Fn(&ExternalName) -> *const u8,
) {
use std::ptr::write_unaligned;
@@ -62,7 +63,15 @@ impl CompiledBlob {
write_unaligned(at as *mut i32, pcrel)
};
}
Reloc::X86CallPLTRel4 => todo!("PLT relocation"),
Reloc::X86CallPLTRel4 => {
let base = get_plt_entry(name);
let what = unsafe { base.offset(isize::try_from(addend).unwrap()) };
let pcrel = i32::try_from((what as isize) - (at as isize)).unwrap();
#[cfg_attr(feature = "cargo-clippy", allow(clippy::cast_ptr_alignment))]
unsafe {
write_unaligned(at as *mut i32, pcrel)
};
}
_ => unimplemented!(),
}
}