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dyld: keep EXIDX section data through program header entry

This commit is contained in:
Astro 2020-06-24 00:18:34 +02:00
parent 64cdf0ade3
commit 571ab66114
2 changed files with 22 additions and 10 deletions
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2
src/libdyld/src/elf.rs
View File

@ -255,6 +255,7 @@ pub const PT_SUNWSTACK: u32 = 1879048187;
pub const PT_HISUNW: u32 = 1879048191;
pub const PT_HIOS: u32 = 1879048191;
pub const PT_LOPROC: u32 = 1879048192;
pub const PT_ARM_EXIDX: u32 = 1879048193;
pub const PT_HIPROC: u32 = 2147483647;
pub const PF_X: usize = 1;
pub const PF_W: usize = 2;
@ -1334,7 +1335,6 @@ pub const SHF_ARM_COMDEF: usize = 2147483648;
pub const PF_ARM_SB: usize = 268435456;
pub const PF_ARM_PI: usize = 536870912;
pub const PF_ARM_ABS: usize = 1073741824;
pub const PT_ARM_EXIDX: usize = 1879048193;
pub const SHT_ARM_EXIDX: usize = 1879048193;
pub const SHT_ARM_PREEMPTMAP: usize = 1879048194;
pub const SHT_ARM_ATTRIBUTES: usize = 1879048195;

30
src/libdyld/src/lib.rs
View File

@ -4,7 +4,7 @@ extern crate alloc;
extern crate log;
use core::{fmt, str, convert};
use alloc::string::String;
use alloc::{borrow::ToOwned, string::String, vec::Vec};
use log::{debug, trace};
use elf::*;
@ -60,6 +60,7 @@ fn elf_hash(name: &[u8]) -> u32 {
pub struct Library {
pub image: Image,
dyn_section: DynamicSection,
pub exidx: Vec<u8>,
}
impl Library {
@ -164,21 +165,31 @@ pub fn load(
.map_err(|_| "cannot allocate target image")?;
debug!("ELF target: {} bytes, align to {:X}, allocated at {:08X}", image_size, image_align, image.ptr() as usize);
let mut exidx = None;
// LOAD
for phdr in file.program_headers() {
let phdr = phdr.ok_or("cannot read program header")?;
if phdr.p_type != PT_LOAD { continue; }
trace!("Program header: {:08X}+{:08X} to {:08X}",
phdr.p_offset, phdr.p_filesz,
image.ptr() as u32
);
let src = file.get(phdr.p_offset as usize..(phdr.p_offset + phdr.p_filesz) as usize)
.ok_or("program header requests an out of bounds load (in file)")?;
let dst = image.get_mut(phdr.p_vaddr as usize..
(phdr.p_vaddr + phdr.p_filesz) as usize)
.ok_or("program header requests an out of bounds load (in target)")?;
dst.copy_from_slice(src);
let file_range = phdr.p_offset as usize..(phdr.p_offset + phdr.p_filesz) as usize;
match phdr.p_type {
PT_LOAD => {
let src = file.get(file_range)
.ok_or("program header requests an out of bounds load (in file)")?;
let dst = image.get_mut(phdr.p_vaddr as usize..
(phdr.p_vaddr + phdr.p_filesz) as usize)
.ok_or("program header requests an out of bounds load (in target)")?;
dst.copy_from_slice(src);
}
PT_ARM_EXIDX => {
let src = file.get(file_range)
.ok_or("program header requests an out of bounds load (in file)")?;
exidx = Some(src.to_owned());
}
_ => {}
}
}
// relocate DYNAMIC
@ -190,6 +201,7 @@ pub fn load(
let lib = Library {
image,
dyn_section,
exidx: exidx.ok_or("missing EXIDX program header")?,
};
for rela in lib.rela() {