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74e536eb62
After the N64 static relocation model support was added to llvm it is required to add its support in RuntimeDyld also because lldb uses ExecutionEngine for evaluating expressions. Reviewed by sdardis Differential: D31649 llvm-svn: 305997
319 lines
12 KiB
C++
319 lines
12 KiB
C++
//===-- RuntimeDyldELFMips.cpp ---- ELF/Mips specific code. -----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "RuntimeDyldELFMips.h"
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#include "llvm/BinaryFormat/ELF.h"
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#define DEBUG_TYPE "dyld"
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void RuntimeDyldELFMips::resolveRelocation(const RelocationEntry &RE,
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uint64_t Value) {
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const SectionEntry &Section = Sections[RE.SectionID];
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if (IsMipsO32ABI)
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resolveMIPSO32Relocation(Section, RE.Offset, Value, RE.RelType, RE.Addend);
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else if (IsMipsN32ABI) {
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resolveMIPSN32Relocation(Section, RE.Offset, Value, RE.RelType, RE.Addend,
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RE.SymOffset, RE.SectionID);
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} else if (IsMipsN64ABI)
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resolveMIPSN64Relocation(Section, RE.Offset, Value, RE.RelType, RE.Addend,
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RE.SymOffset, RE.SectionID);
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else
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llvm_unreachable("Mips ABI not handled");
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}
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uint64_t RuntimeDyldELFMips::evaluateRelocation(const RelocationEntry &RE,
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uint64_t Value,
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uint64_t Addend) {
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if (IsMipsN32ABI) {
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const SectionEntry &Section = Sections[RE.SectionID];
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Value = evaluateMIPS64Relocation(Section, RE.Offset, Value, RE.RelType,
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Addend, RE.SymOffset, RE.SectionID);
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return Value;
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}
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llvm_unreachable("Not reachable");
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}
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void RuntimeDyldELFMips::applyRelocation(const RelocationEntry &RE,
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uint64_t Value) {
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if (IsMipsN32ABI) {
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const SectionEntry &Section = Sections[RE.SectionID];
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applyMIPSRelocation(Section.getAddressWithOffset(RE.Offset), Value,
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RE.RelType);
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return;
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}
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llvm_unreachable("Not reachable");
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}
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int64_t
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RuntimeDyldELFMips::evaluateMIPS32Relocation(const SectionEntry &Section,
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uint64_t Offset, uint64_t Value,
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uint32_t Type) {
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DEBUG(dbgs() << "evaluateMIPS32Relocation, LocalAddress: 0x"
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<< format("%llx", Section.getAddressWithOffset(Offset))
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<< " FinalAddress: 0x"
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<< format("%llx", Section.getLoadAddressWithOffset(Offset))
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<< " Value: 0x" << format("%llx", Value) << " Type: 0x"
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<< format("%x", Type) << "\n");
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switch (Type) {
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default:
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llvm_unreachable("Unknown relocation type!");
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return Value;
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case ELF::R_MIPS_32:
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return Value;
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case ELF::R_MIPS_26:
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return Value >> 2;
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case ELF::R_MIPS_HI16:
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// Get the higher 16-bits. Also add 1 if bit 15 is 1.
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return (Value + 0x8000) >> 16;
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case ELF::R_MIPS_LO16:
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return Value;
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case ELF::R_MIPS_PC32: {
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uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
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return Value - FinalAddress;
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}
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case ELF::R_MIPS_PC16: {
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uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
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return (Value - FinalAddress) >> 2;
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}
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case ELF::R_MIPS_PC19_S2: {
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uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
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return (Value - (FinalAddress & ~0x3)) >> 2;
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}
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case ELF::R_MIPS_PC21_S2: {
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uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
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return (Value - FinalAddress) >> 2;
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}
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case ELF::R_MIPS_PC26_S2: {
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uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
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return (Value - FinalAddress) >> 2;
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}
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case ELF::R_MIPS_PCHI16: {
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uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
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return (Value - FinalAddress + 0x8000) >> 16;
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}
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case ELF::R_MIPS_PCLO16: {
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uint32_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
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return Value - FinalAddress;
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}
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}
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}
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int64_t RuntimeDyldELFMips::evaluateMIPS64Relocation(
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const SectionEntry &Section, uint64_t Offset, uint64_t Value, uint32_t Type,
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int64_t Addend, uint64_t SymOffset, SID SectionID) {
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DEBUG(dbgs() << "evaluateMIPS64Relocation, LocalAddress: 0x"
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<< format("%llx", Section.getAddressWithOffset(Offset))
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<< " FinalAddress: 0x"
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<< format("%llx", Section.getLoadAddressWithOffset(Offset))
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<< " Value: 0x" << format("%llx", Value) << " Type: 0x"
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<< format("%x", Type) << " Addend: 0x" << format("%llx", Addend)
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<< " SymOffset: " << format("%x", SymOffset) << "\n");
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switch (Type) {
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default:
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llvm_unreachable("Not implemented relocation type!");
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break;
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case ELF::R_MIPS_JALR:
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case ELF::R_MIPS_NONE:
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break;
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case ELF::R_MIPS_32:
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case ELF::R_MIPS_64:
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return Value + Addend;
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case ELF::R_MIPS_26:
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return ((Value + Addend) >> 2) & 0x3ffffff;
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case ELF::R_MIPS_GPREL16: {
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uint64_t GOTAddr = getSectionLoadAddress(SectionToGOTMap[SectionID]);
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return Value + Addend - (GOTAddr + 0x7ff0);
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}
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case ELF::R_MIPS_SUB:
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return Value - Addend;
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case ELF::R_MIPS_HI16:
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// Get the higher 16-bits. Also add 1 if bit 15 is 1.
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return ((Value + Addend + 0x8000) >> 16) & 0xffff;
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case ELF::R_MIPS_LO16:
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return (Value + Addend) & 0xffff;
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case ELF::R_MIPS_HIGHER:
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return ((Value + Addend + 0x80008000) >> 32) & 0xffff;
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case ELF::R_MIPS_HIGHEST:
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return ((Value + Addend + 0x800080008000) >> 48) & 0xffff;
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case ELF::R_MIPS_CALL16:
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case ELF::R_MIPS_GOT_DISP:
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case ELF::R_MIPS_GOT_PAGE: {
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uint8_t *LocalGOTAddr =
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getSectionAddress(SectionToGOTMap[SectionID]) + SymOffset;
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uint64_t GOTEntry = readBytesUnaligned(LocalGOTAddr, getGOTEntrySize());
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Value += Addend;
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if (Type == ELF::R_MIPS_GOT_PAGE)
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Value = (Value + 0x8000) & ~0xffff;
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if (GOTEntry)
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assert(GOTEntry == Value &&
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"GOT entry has two different addresses.");
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else
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writeBytesUnaligned(Value, LocalGOTAddr, getGOTEntrySize());
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return (SymOffset - 0x7ff0) & 0xffff;
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}
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case ELF::R_MIPS_GOT_OFST: {
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int64_t page = (Value + Addend + 0x8000) & ~0xffff;
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return (Value + Addend - page) & 0xffff;
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}
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case ELF::R_MIPS_GPREL32: {
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uint64_t GOTAddr = getSectionLoadAddress(SectionToGOTMap[SectionID]);
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return Value + Addend - (GOTAddr + 0x7ff0);
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}
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case ELF::R_MIPS_PC16: {
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uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
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return ((Value + Addend - FinalAddress) >> 2) & 0xffff;
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}
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case ELF::R_MIPS_PC32: {
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uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
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return Value + Addend - FinalAddress;
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}
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case ELF::R_MIPS_PC18_S3: {
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uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
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return ((Value + Addend - (FinalAddress & ~0x7)) >> 3) & 0x3ffff;
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}
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case ELF::R_MIPS_PC19_S2: {
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uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
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return ((Value + Addend - (FinalAddress & ~0x3)) >> 2) & 0x7ffff;
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}
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case ELF::R_MIPS_PC21_S2: {
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uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
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return ((Value + Addend - FinalAddress) >> 2) & 0x1fffff;
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}
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case ELF::R_MIPS_PC26_S2: {
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uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
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return ((Value + Addend - FinalAddress) >> 2) & 0x3ffffff;
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}
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case ELF::R_MIPS_PCHI16: {
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uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
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return ((Value + Addend - FinalAddress + 0x8000) >> 16) & 0xffff;
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}
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case ELF::R_MIPS_PCLO16: {
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uint64_t FinalAddress = Section.getLoadAddressWithOffset(Offset);
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return (Value + Addend - FinalAddress) & 0xffff;
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}
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}
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return 0;
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}
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void RuntimeDyldELFMips::applyMIPSRelocation(uint8_t *TargetPtr, int64_t Value,
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uint32_t Type) {
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uint32_t Insn = readBytesUnaligned(TargetPtr, 4);
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switch (Type) {
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default:
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llvm_unreachable("Unknown relocation type!");
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break;
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case ELF::R_MIPS_GPREL16:
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case ELF::R_MIPS_HI16:
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case ELF::R_MIPS_LO16:
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case ELF::R_MIPS_HIGHER:
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case ELF::R_MIPS_HIGHEST:
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case ELF::R_MIPS_PC16:
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case ELF::R_MIPS_PCHI16:
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case ELF::R_MIPS_PCLO16:
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case ELF::R_MIPS_CALL16:
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case ELF::R_MIPS_GOT_DISP:
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case ELF::R_MIPS_GOT_PAGE:
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case ELF::R_MIPS_GOT_OFST:
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Insn = (Insn & 0xffff0000) | (Value & 0x0000ffff);
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writeBytesUnaligned(Insn, TargetPtr, 4);
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break;
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case ELF::R_MIPS_PC18_S3:
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Insn = (Insn & 0xfffc0000) | (Value & 0x0003ffff);
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writeBytesUnaligned(Insn, TargetPtr, 4);
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break;
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case ELF::R_MIPS_PC19_S2:
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Insn = (Insn & 0xfff80000) | (Value & 0x0007ffff);
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writeBytesUnaligned(Insn, TargetPtr, 4);
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break;
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case ELF::R_MIPS_PC21_S2:
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Insn = (Insn & 0xffe00000) | (Value & 0x001fffff);
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writeBytesUnaligned(Insn, TargetPtr, 4);
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break;
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case ELF::R_MIPS_26:
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case ELF::R_MIPS_PC26_S2:
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Insn = (Insn & 0xfc000000) | (Value & 0x03ffffff);
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writeBytesUnaligned(Insn, TargetPtr, 4);
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break;
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case ELF::R_MIPS_32:
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case ELF::R_MIPS_GPREL32:
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case ELF::R_MIPS_PC32:
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writeBytesUnaligned(Value & 0xffffffff, TargetPtr, 4);
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break;
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case ELF::R_MIPS_64:
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case ELF::R_MIPS_SUB:
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writeBytesUnaligned(Value, TargetPtr, 8);
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break;
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}
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}
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void RuntimeDyldELFMips::resolveMIPSN32Relocation(
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const SectionEntry &Section, uint64_t Offset, uint64_t Value, uint32_t Type,
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int64_t Addend, uint64_t SymOffset, SID SectionID) {
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int64_t CalculatedValue = evaluateMIPS64Relocation(
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Section, Offset, Value, Type, Addend, SymOffset, SectionID);
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applyMIPSRelocation(Section.getAddressWithOffset(Offset), CalculatedValue,
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Type);
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}
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void RuntimeDyldELFMips::resolveMIPSN64Relocation(
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const SectionEntry &Section, uint64_t Offset, uint64_t Value, uint32_t Type,
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int64_t Addend, uint64_t SymOffset, SID SectionID) {
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uint32_t r_type = Type & 0xff;
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uint32_t r_type2 = (Type >> 8) & 0xff;
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uint32_t r_type3 = (Type >> 16) & 0xff;
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// RelType is used to keep information for which relocation type we are
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// applying relocation.
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uint32_t RelType = r_type;
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int64_t CalculatedValue = evaluateMIPS64Relocation(Section, Offset, Value,
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RelType, Addend,
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SymOffset, SectionID);
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if (r_type2 != ELF::R_MIPS_NONE) {
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RelType = r_type2;
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CalculatedValue = evaluateMIPS64Relocation(Section, Offset, 0, RelType,
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CalculatedValue, SymOffset,
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SectionID);
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}
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if (r_type3 != ELF::R_MIPS_NONE) {
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RelType = r_type3;
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CalculatedValue = evaluateMIPS64Relocation(Section, Offset, 0, RelType,
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CalculatedValue, SymOffset,
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SectionID);
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}
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applyMIPSRelocation(Section.getAddressWithOffset(Offset), CalculatedValue,
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RelType);
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}
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void RuntimeDyldELFMips::resolveMIPSO32Relocation(const SectionEntry &Section,
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uint64_t Offset,
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uint32_t Value, uint32_t Type,
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int32_t Addend) {
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uint8_t *TargetPtr = Section.getAddressWithOffset(Offset);
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Value += Addend;
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DEBUG(dbgs() << "resolveMIPSO32Relocation, LocalAddress: "
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<< Section.getAddressWithOffset(Offset) << " FinalAddress: "
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<< format("%p", Section.getLoadAddressWithOffset(Offset))
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<< " Value: " << format("%x", Value)
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<< " Type: " << format("%x", Type)
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<< " Addend: " << format("%x", Addend) << "\n");
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Value = evaluateMIPS32Relocation(Section, Offset, Value, Type);
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applyMIPSRelocation(TargetPtr, Value, Type);
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}
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