forked from M-Labs/artiq-zynq
dyld: add Image.rebind()
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12ba867268
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@ -93,6 +93,7 @@ extern fn dl_unwind_find_exidx(pc: u32, len_ptr: *mut u32) -> u32 {
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pub struct Library {
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pub struct Library {
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pub image: Image,
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pub image: Image,
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pub arch: Arch,
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dyn_section: DynamicSection,
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dyn_section: DynamicSection,
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}
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}
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@ -163,6 +164,11 @@ impl Library {
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Ok(self.strtab().get(offset..offset + size)
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Ok(self.strtab().get(offset..offset + size)
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.ok_or("cannot read symbol name")?)
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.ok_or("cannot read symbol name")?)
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}
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}
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/// Rebind Rela by `name` to a new `addr`
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pub fn rebind(&self, name: &[u8], addr: *const ()) -> Result<(), Error> {
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reloc::rebind(self.arch, self, name, addr as Elf32_Word)
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}
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}
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}
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pub fn load(
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pub fn load(
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@ -235,6 +241,7 @@ pub fn load(
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debug!("Relocating {} rela, {} rel, {} pltrel",
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debug!("Relocating {} rela, {} rel, {} pltrel",
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dyn_section.rela.len(), dyn_section.rel.len(), dyn_section.pltrel.len());
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dyn_section.rela.len(), dyn_section.rel.len(), dyn_section.pltrel.len());
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let lib = Library {
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let lib = Library {
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arch,
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image,
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image,
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dyn_section
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dyn_section
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};
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};
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@ -133,3 +133,27 @@ pub fn relocate<R: Relocatable>(
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lib.image.write(rel.offset(), value)
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lib.image.write(rel.offset(), value)
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}
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}
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pub fn rebind(
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arch: Arch, lib: &Library, name: &[u8], value: Elf32_Word
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) -> Result<(), Error> {
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for rela in lib.pltrel() {
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let rel_type = RelType::new(arch, rela.type_info())
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.ok_or("unsupported relocation type")?;
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match rel_type {
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RelType::Lookup => {
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let sym = lib.symtab().get(ELF32_R_SYM(rela.r_info) as usize)
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.ok_or("symbol out of bounds of symbol table")?;
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let sym_name = lib.name_starting_at(sym.st_name as usize)?;
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if sym_name == name {
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lib.image.write(rela.offset(), value)?
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}
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}
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// No associated symbols for other relocation types.
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_ => {}
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}
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}
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Ok(())
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}
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