PPCAsmBackend.cpp revision 79aa3417eb6f58d668aadfedf075240a41d35a26
1b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner//===-- PPCAsmBackend.cpp - PPC Assembler Backend -------------------------===// 2b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner// 3b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner// The LLVM Compiler Infrastructure 4b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner// 5b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner// This file is distributed under the University of Illinois Open Source 6b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner// License. See LICENSE.TXT for details. 7b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner// 8b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner//===----------------------------------------------------------------------===// 9b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 10966aeb5788c242cfaca35c56c0ddc0ff778d4376Evan Cheng#include "MCTargetDesc/PPCMCTargetDesc.h" 11966aeb5788c242cfaca35c56c0ddc0ff778d4376Evan Cheng#include "MCTargetDesc/PPCFixupKinds.h" 1279aa3417eb6f58d668aadfedf075240a41d35a26Craig Topper#include "llvm/MC/MCAsmBackend.h" 132c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky#include "llvm/MC/MCELFObjectWriter.h" 14aa4b7dd13ba83152473950d7014a29686dc7eef6Daniel Dunbar#include "llvm/MC/MCMachObjectWriter.h" 15b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner#include "llvm/MC/MCSectionMachO.h" 16b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner#include "llvm/MC/MCObjectWriter.h" 17ba8297ec08cdf7ae0c1e0c18ce07922e1f822643Jim Grosbach#include "llvm/MC/MCValue.h" 1836d76a8dbc87b62de82a4a8c0d7cb4bb2a202934Daniel Dunbar#include "llvm/Object/MachOFormat.h" 192c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky#include "llvm/Support/ELF.h" 202c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky#include "llvm/Support/ErrorHandling.h" 213e74d6fdd248e20a280f1dff3da9a6c689c2c4c3Evan Cheng#include "llvm/Support/TargetRegistry.h" 22b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattnerusing namespace llvm; 23b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 242c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divackystatic unsigned adjustFixupValue(unsigned Kind, uint64_t Value) { 252c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky switch (Kind) { 262c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky default: 272c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky llvm_unreachable("Unknown fixup kind!"); 282c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky case FK_Data_1: 292c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky case FK_Data_2: 302c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky case FK_Data_4: 312c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky return Value; 322c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky case PPC::fixup_ppc_brcond14: 332c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky return Value & 0x3ffc; 342c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky case PPC::fixup_ppc_br24: 352c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky return Value & 0x3fffffc; 362c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky#if 0 372c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky case PPC::fixup_ppc_hi16: 382c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky return (Value >> 16) & 0xffff; 392c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky#endif 402c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky case PPC::fixup_ppc_ha16: 412c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky return ((Value >> 16) + ((Value & 0x8000) ? 1 : 0)) & 0xffff; 422c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky case PPC::fixup_ppc_lo16: 432c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky return Value & 0xffff; 442c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky } 452c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky} 462c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky 47b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattnernamespace { 48ae5abd595f5442767313a4c8a24008ad19323cebDaniel Dunbarclass PPCMachObjectWriter : public MCMachObjectTargetWriter { 495d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbarpublic: 505d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar PPCMachObjectWriter(bool Is64Bit, uint32_t CPUType, 515d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar uint32_t CPUSubtype) 525d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar : MCMachObjectTargetWriter(Is64Bit, CPUType, CPUSubtype) {} 53ba8297ec08cdf7ae0c1e0c18ce07922e1f822643Jim Grosbach 54ba8297ec08cdf7ae0c1e0c18ce07922e1f822643Jim Grosbach void RecordRelocation(MachObjectWriter *Writer, 55ba8297ec08cdf7ae0c1e0c18ce07922e1f822643Jim Grosbach const MCAssembler &Asm, const MCAsmLayout &Layout, 56ba8297ec08cdf7ae0c1e0c18ce07922e1f822643Jim Grosbach const MCFragment *Fragment, const MCFixup &Fixup, 57ba8297ec08cdf7ae0c1e0c18ce07922e1f822643Jim Grosbach MCValue Target, uint64_t &FixedValue) {} 58ae5abd595f5442767313a4c8a24008ad19323cebDaniel Dunbar}; 59ae5abd595f5442767313a4c8a24008ad19323cebDaniel Dunbar 6078c10eeaa57d1c6c4b7781d3c0bcb0cfbbc43b5cEvan Chengclass PPCAsmBackend : public MCAsmBackend { 61297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbarconst Target &TheTarget; 62297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbarpublic: 6378c10eeaa57d1c6c4b7781d3c0bcb0cfbbc43b5cEvan Cheng PPCAsmBackend(const Target &T) : MCAsmBackend(), TheTarget(T) {} 642761fc427082215c2affcc9d8db8491400bc9e5dDaniel Dunbar 65297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar unsigned getNumFixupKinds() const { return PPC::NumTargetFixupKinds; } 66297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar 67297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const { 68297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar const static MCFixupKindInfo Infos[PPC::NumTargetFixupKinds] = { 69297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar // name offset bits flags 70297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar { "fixup_ppc_br24", 6, 24, MCFixupKindInfo::FKF_IsPCRel }, 71297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar { "fixup_ppc_brcond14", 16, 14, MCFixupKindInfo::FKF_IsPCRel }, 72297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar { "fixup_ppc_lo16", 16, 16, 0 }, 73297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar { "fixup_ppc_ha16", 16, 16, 0 }, 74297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar { "fixup_ppc_lo14", 16, 14, 0 } 75297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar }; 76bc3af9b618c061294c7df00f3313f9c5234b8450Jim Grosbach 77297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar if (Kind < FirstTargetFixupKind) 7878c10eeaa57d1c6c4b7781d3c0bcb0cfbbc43b5cEvan Cheng return MCAsmBackend::getFixupKindInfo(Kind); 79bc3af9b618c061294c7df00f3313f9c5234b8450Jim Grosbach 80297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() && 81297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar "Invalid kind!"); 82297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar return Infos[Kind - FirstTargetFixupKind]; 83297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar } 84bc3af9b618c061294c7df00f3313f9c5234b8450Jim Grosbach 85ec3433852dd11e8ff60c9610b4c84468e5935f2bJim Grosbach bool mayNeedRelaxation(const MCInst &Inst) const { 86297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar // FIXME. 87297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar return false; 88297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar } 89370b78d795154899a22ca2b4674e890661ff1d59Jim Grosbach 90370b78d795154899a22ca2b4674e890661ff1d59Jim Grosbach bool fixupNeedsRelaxation(const MCFixup &Fixup, 91370b78d795154899a22ca2b4674e890661ff1d59Jim Grosbach uint64_t Value, 92370b78d795154899a22ca2b4674e890661ff1d59Jim Grosbach const MCInstFragment *DF, 93370b78d795154899a22ca2b4674e890661ff1d59Jim Grosbach const MCAsmLayout &Layout) const { 94370b78d795154899a22ca2b4674e890661ff1d59Jim Grosbach // FIXME. 95bc2198133a1836598b54b943420748e75d5dea94Craig Topper llvm_unreachable("relaxInstruction() unimplemented"); 96370b78d795154899a22ca2b4674e890661ff1d59Jim Grosbach } 97370b78d795154899a22ca2b4674e890661ff1d59Jim Grosbach 98bc3af9b618c061294c7df00f3313f9c5234b8450Jim Grosbach 99ec3433852dd11e8ff60c9610b4c84468e5935f2bJim Grosbach void relaxInstruction(const MCInst &Inst, MCInst &Res) const { 100297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar // FIXME. 101bc2198133a1836598b54b943420748e75d5dea94Craig Topper llvm_unreachable("relaxInstruction() unimplemented"); 102297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar } 103bc3af9b618c061294c7df00f3313f9c5234b8450Jim Grosbach 104ec3433852dd11e8ff60c9610b4c84468e5935f2bJim Grosbach bool writeNopData(uint64_t Count, MCObjectWriter *OW) const { 105297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar // FIXME: Zero fill for now. That's not right, but at least will get the 106297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar // section size right. 107297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar for (uint64_t i = 0; i != Count; ++i) 108297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar OW->Write8(0); 109297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar return true; 110bc3af9b618c061294c7df00f3313f9c5234b8450Jim Grosbach } 111bc3af9b618c061294c7df00f3313f9c5234b8450Jim Grosbach 112297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar unsigned getPointerSize() const { 113297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar StringRef Name = TheTarget.getName(); 114297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar if (Name == "ppc64") return 8; 115297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar assert(Name == "ppc32" && "Unknown target name!"); 116297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar return 4; 117297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar } 118297ed28bf9c633db52ff31115d439a0133b00efbDaniel Dunbar}; 119b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner} // end anonymous namespace 120b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 121b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 122b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner// FIXME: This should be in a separate file. 123b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattnernamespace { 124b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner class DarwinPPCAsmBackend : public PPCAsmBackend { 125b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner public: 1267b62afac0a6f967e7466e60ceb26bfdcff2e59f4Daniel Dunbar DarwinPPCAsmBackend(const Target &T) : PPCAsmBackend(T) { } 127bc3af9b618c061294c7df00f3313f9c5234b8450Jim Grosbach 128ec3433852dd11e8ff60c9610b4c84468e5935f2bJim Grosbach void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize, 129b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner uint64_t Value) const { 130bc2198133a1836598b54b943420748e75d5dea94Craig Topper llvm_unreachable("UNIMP"); 131b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner } 132bc3af9b618c061294c7df00f3313f9c5234b8450Jim Grosbach 133b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner MCObjectWriter *createObjectWriter(raw_ostream &OS) const { 134b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner bool is64 = getPointerSize() == 8; 1355d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar return createMachObjectWriter(new PPCMachObjectWriter( 1365d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar /*Is64Bit=*/is64, 1375d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar (is64 ? object::mach::CTM_PowerPC64 : 1385d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar object::mach::CTM_PowerPC), 1395d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar object::mach::CSPPC_ALL), 1405d05d9769ec98cdee359fd934a56c9455e21232bDaniel Dunbar OS, /*IsLittleEndian=*/false); 141b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner } 142bc3af9b618c061294c7df00f3313f9c5234b8450Jim Grosbach 143b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner virtual bool doesSectionRequireSymbols(const MCSection &Section) const { 144b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner return false; 145b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner } 146b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner }; 1472c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky 1482c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky class ELFPPCAsmBackend : public PPCAsmBackend { 149dc9a8a378daf432d8dcfc178507afe149706f9a6Rafael Espindola uint8_t OSABI; 1502c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky public: 151dc9a8a378daf432d8dcfc178507afe149706f9a6Rafael Espindola ELFPPCAsmBackend(const Target &T, uint8_t OSABI) : 152dc9a8a378daf432d8dcfc178507afe149706f9a6Rafael Espindola PPCAsmBackend(T), OSABI(OSABI) { } 153bc3af9b618c061294c7df00f3313f9c5234b8450Jim Grosbach 154ec3433852dd11e8ff60c9610b4c84468e5935f2bJim Grosbach void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize, 1552c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky uint64_t Value) const { 1562c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky Value = adjustFixupValue(Fixup.getKind(), Value); 1572c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky if (!Value) return; // Doesn't change encoding. 1582c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky 1592c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky unsigned Offset = Fixup.getOffset(); 1602c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky 1612c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky // For each byte of the fragment that the fixup touches, mask in the bits from 1622c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky // the fixup value. The Value has been "split up" into the appropriate 1632c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky // bitfields above. 1642c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky for (unsigned i = 0; i != 4; ++i) 1652c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky Data[Offset + i] |= uint8_t((Value >> ((4 - i - 1)*8)) & 0xff); 1662c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky } 167bc3af9b618c061294c7df00f3313f9c5234b8450Jim Grosbach 1682c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky MCObjectWriter *createObjectWriter(raw_ostream &OS) const { 1692c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky bool is64 = getPointerSize() == 8; 170f51e95a9f2ce10ca0eb8a353e1fc1d9d49ec130cRafael Espindola return createPPCELFObjectWriter(OS, is64, OSABI); 1712c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky } 172bc3af9b618c061294c7df00f3313f9c5234b8450Jim Grosbach 1732c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky virtual bool doesSectionRequireSymbols(const MCSection &Section) const { 1742c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky return false; 1752c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky } 1762c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky }; 1772c0d69fad0e658117922f3d96d9b732bedf9fd47Roman Divacky 178b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner} // end anonymous namespace 179b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 180b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 181b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 182b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner 18378c10eeaa57d1c6c4b7781d3c0bcb0cfbbc43b5cEvan ChengMCAsmBackend *llvm::createPPCAsmBackend(const Target &T, StringRef TT) { 184912225e18559a73228099330a4c253fdccf9fa3dDaniel Dunbar if (Triple(TT).isOSDarwin()) 185b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner return new DarwinPPCAsmBackend(T); 186912225e18559a73228099330a4c253fdccf9fa3dDaniel Dunbar 187dc9a8a378daf432d8dcfc178507afe149706f9a6Rafael Espindola uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(Triple(TT).getOS()); 188dc9a8a378daf432d8dcfc178507afe149706f9a6Rafael Espindola return new ELFPPCAsmBackend(T, OSABI); 189b46443a686c29a1aa8f881c48c35d3f61a35f7acChris Lattner} 190