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dyld: obtain EXIDX offsets from section headers

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Gitea issue #16
This commit is contained in:
Astro 2020-07-27 01:58:42 +02:00
parent 7f983a453d
commit 641204425e
2 changed files with 22 additions and 6 deletions
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8
src/libdyld/src/file.rs
View File

@ -56,6 +56,14 @@ impl<'a> File<'a> {
})
}
pub fn section_headers<'b>(&'b self) -> impl Iterator<Item = Option<Elf32_Shdr>> + 'b
{
(0..self.ehdr.e_shnum).map(move |i| {
let shdr_off = self.ehdr.e_shoff as usize + mem::size_of::<Elf32_Shdr>() * i as usize;
self.read_unaligned::<Elf32_Shdr>(shdr_off)
})
}
pub fn dyn_header_vaddr(&self) -> Option<Range<usize>> {
self.program_headers()
.filter_map(|phdr| phdr)

20
src/libdyld/src/lib.rs
View File

@ -222,13 +222,21 @@ pub fn load(
.ok_or("program header requests an out of bounds load (in target)")?;
dst.copy_from_slice(src);
}
PT_ARM_EXIDX => {
let range = image.get(phdr.p_vaddr as usize..
(phdr.p_vaddr + phdr.p_filesz) as usize)
.ok_or("program header requests and out of bounds load (in target)")?;
_ => {}
}
}
// Obtain EXIDX
for shdr in file.section_headers() {
let shdr = shdr.ok_or("cannot read section header")?;
match shdr.sh_type as usize {
SHT_ARM_EXIDX => {
let slice = image.get(shdr.sh_addr as usize..
(shdr.sh_addr + shdr.sh_size) as usize)
.ok_or("section header requests an out of bounds load (in target)")?;
unsafe {
KERNEL_EXIDX_START = range.as_ptr() as u32;
KERNEL_EXIDX_END = range.as_ptr().add(range.len()) as u32;
KERNEL_EXIDX_START = slice.as_ptr() as u32;
KERNEL_EXIDX_END = slice.as_ptr().add(slice.len()) as u32;
}
}
_ => {}