321 lines
12 KiB
C++
321 lines
12 KiB
C++
//===-- RuntimeDyldELFMips.cpp ---- ELF/Mips specific code. -----*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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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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LLVM_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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LLVM_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"
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<< format("%llx", Addend)
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<< " Offset: " << format("%llx" PRIx64, Offset)
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<< " SID: " << format("%d", SectionID)
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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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LLVM_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) << " Type: "
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<< format("%x", Type) << " Addend: " << format("%x", Addend)
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<< " SymOffset: " << format("%x", Offset) << "\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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