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LibELF: Restore the relocation code from git history

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This is going to be very useful for implementing kernel modules.
We'll also need it for dynamic linking later on.
This commit is contained in:
Andreas Kling 2019-11-28 20:53:02 +01:00
parent 0c4f29f71f
commit c10a5ac4ad
3 changed files with 94 additions and 4 deletions
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44
Libraries/LibELF/ELFImage.cpp
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@ -106,14 +106,21 @@ bool ELFImage::parse()
for (unsigned i = 0; i < section_count(); ++i) {
auto& sh = section_header(i);
if (sh.sh_type == SHT_SYMTAB) {
ASSERT(!m_symbol_table_section_index);
ASSERT(!m_symbol_table_section_index || m_symbol_table_section_index == i);
m_symbol_table_section_index = i;
}
if (sh.sh_type == SHT_STRTAB && i != header().e_shstrndx) {
ASSERT(!m_string_table_section_index);
ASSERT(!m_string_table_section_index || m_string_table_section_index == i);
m_string_table_section_index = i;
}
}
// Then create a name-to-index map.
for (unsigned i = 0; i < section_count(); ++i) {
auto& section = this->section(i);
m_sections.set(section.name(), move(i));
}
return true;
}
@ -173,3 +180,36 @@ const ELFImage::ProgramHeader ELFImage::program_header(unsigned index) const
ASSERT(index < program_header_count());
return ProgramHeader(*this, index);
}
const ELFImage::Relocation ELFImage::RelocationSection::relocation(unsigned index) const
{
ASSERT(index < relocation_count());
auto* rels = reinterpret_cast<const Elf32_Rel*>(m_image.raw_data(offset()));
return Relocation(m_image, rels[index]);
}
const ELFImage::RelocationSection ELFImage::Section::relocations() const
{
// FIXME: This is ugly.
char relocation_sectionName[128];
sprintf(relocation_sectionName, ".rel%s", name());
#ifdef ELFIMAGE_DEBUG
kprintf("looking for '%s'\n", relocation_sectionName);
#endif
auto relocation_section = m_image.lookup_section(relocation_sectionName);
if (relocation_section.type() != SHT_REL)
return static_cast<const RelocationSection>(m_image.section(0));
#ifdef ELFIMAGE_DEBUG
kprintf("Found relocations for %s in %s\n", name(), relocation_section.name());
#endif
return static_cast<const RelocationSection>(relocation_section);
}
const ELFImage::Section ELFImage::lookup_section(const char* name) const
{
if (auto it = m_sections.find(name); it != m_sections.end())
return section((*it).value);
return section(0);
}