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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@351636 91177308-0d34-0410-b5e6-96231b3b80d8
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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