RuntimeDyldELF/AArch64: Implement basic GOT support
This patch implements two GOT relocations:
R_AARCH64_ADR_GOT_PAGE and R_AARCH64_LD64_GOT_LO12_NC
Differential revision: https://reviews.llvm.org/D28571
llvm-svn: 294191
diff --git a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.h b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.h
index d1867d0..4989797 100644
--- a/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.h
+++ b/llvm/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.h
@@ -43,6 +43,9 @@
bool resolveAArch64ShortBranch(unsigned SectionID, relocation_iterator RelI,
const RelocationValueRef &Value);
+ void resolveAArch64Branch(unsigned SectionID, const RelocationValueRef &Value,
+ relocation_iterator RelI, StubMap &Stubs);
+
void resolveARMRelocation(const SectionEntry &Section, uint64_t Offset,
uint32_t Value, uint32_t Type, int32_t Addend);
@@ -88,24 +91,26 @@
ObjSectionToIDMap &LocalSections,
RelocationValueRef &Rel);
protected:
- size_t getGOTEntrySize();
+ size_t getGOTEntrySize() override;
private:
SectionEntry &getSection(unsigned SectionID) { return Sections[SectionID]; }
// Allocate no GOT entries for use in the given section.
- uint64_t allocateGOTEntries(unsigned SectionID, unsigned no);
+ uint64_t allocateGOTEntries(unsigned no);
+
+ // Find GOT entry corresponding to relocation or create new one.
+ uint64_t findOrAllocGOTEntry(const RelocationValueRef &Value,
+ unsigned GOTRelType);
// Resolve the relvative address of GOTOffset in Section ID and place
// it at the given Offset
void resolveGOTOffsetRelocation(unsigned SectionID, uint64_t Offset,
- uint64_t GOTOffset);
+ uint64_t GOTOffset, uint32_t Type);
// For a GOT entry referenced from SectionID, compute a relocation entry
// that will place the final resolved value in the GOT slot
- RelocationEntry computeGOTOffsetRE(unsigned SectionID,
- uint64_t GOTOffset,
- uint64_t SymbolOffset,
+ RelocationEntry computeGOTOffsetRE(uint64_t GOTOffset, uint64_t SymbolOffset,
unsigned Type);
// Compute the address in memory where we can find the placeholder
@@ -146,6 +151,10 @@
SmallVector<SID, 2> UnregisteredEHFrameSections;
SmallVector<SID, 2> RegisteredEHFrameSections;
+ // Map between GOT relocation value and corresponding GOT offset
+ std::map<RelocationValueRef, uint64_t> GOTOffsetMap;
+
+ bool relocationNeedsGot(const RelocationRef &R) const override;
bool relocationNeedsStub(const RelocationRef &R) const override;
public: