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LibELF: Implement support for RELA relocations

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This commit is contained in:
Gunnar Beutner 2021-07-01 02:24:11 +02:00 • committed by Andreas Kling
parent 1f93ffcd72
commit f9a8c6f053
Notes: sideshowbarker 2024-07-18 11:11:08 +09:00
3 changed files with 33 additions and 11 deletions
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20
Userland/Libraries/LibELF/DynamicObject.h
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@ -133,8 +133,9 @@ public:
class RelocationSection : public Section {
public:
explicit RelocationSection(const Section& section)
explicit RelocationSection(const Section& section, bool addend_used)
: Section(section.m_dynamic, section.m_section_offset, section.m_section_size_bytes, section.m_entry_size, section.m_name)
, m_addend_used(addend_used)
{
}
unsigned relocation_count() const { return entry_count(); }
@ -145,14 +146,18 @@ public:
void for_each_relocation(F) const;
template<VoidFunction<DynamicObject::Relocation&> F>
void for_each_relocation(F func) const;
private:
const bool m_addend_used;
};
class Relocation {
public:
Relocation(const DynamicObject& dynamic, const ElfW(Rel) & rel, unsigned offset_in_section)
Relocation(const DynamicObject& dynamic, const ElfW(Rela) & rel, unsigned offset_in_section, bool addend_used)
: m_dynamic(dynamic)
, m_rel(rel)
, m_offset_in_section(offset_in_section)
, m_addend_used(addend_used)
{
}
@ -173,6 +178,13 @@ public:
}
unsigned symbol_index() const { return ELF64_R_SYM(m_rel.r_info); }
#endif
unsigned addend() const
{
VERIFY(m_addend_used);
return m_rel.r_addend;
}
bool addend_used() const { return m_addend_used; }
Symbol symbol() const
{
return m_dynamic.symbol(symbol_index());
@ -186,8 +198,9 @@ public:
private:
const DynamicObject& m_dynamic;
const ElfW(Rel) & m_rel;
const ElfW(Rela) & m_rel;
const unsigned m_offset_in_section;
const bool m_addend_used;
};
enum class HashType {
@ -357,6 +370,7 @@ private:
size_t m_number_of_relocations { 0 };
size_t m_size_of_relocation_entry { 0 };
size_t m_size_of_relocation_table { 0 };
bool m_addend_used { false };
FlatPtr m_relocation_table_offset { 0 };
bool m_is_elf_dynamic { false };