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llvm-project/llvm/lib/Target/Hexagon/MCTargetDesc/HexagonAsmBackend.cpp

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//===-- HexagonAsmBackend.cpp - Hexagon Assembler Backend -----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "Hexagon.h"
#include "HexagonFixupKinds.h"
#include "HexagonMCTargetDesc.h"
#include "MCTargetDesc/HexagonBaseInfo.h"
#include "MCTargetDesc/HexagonMCInstrInfo.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCAsmLayout.h"
#include "llvm/MC/MCAssembler.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCELFObjectWriter.h"
#include "llvm/MC/MCFixupKindInfo.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/TargetRegistry.h"
using namespace llvm;
using namespace Hexagon;
#define DEBUG_TYPE "hexagon-asm-backend"
namespace {
class HexagonAsmBackend : public MCAsmBackend {
uint8_t OSABI;
StringRef CPU;
mutable uint64_t relaxedCnt;
std::unique_ptr <MCInstrInfo> MCII;
std::unique_ptr <MCInst *> RelaxTarget;
MCInst * Extender;
public:
HexagonAsmBackend(Target const &T, uint8_t OSABI, StringRef CPU) :
OSABI(OSABI), MCII (T.createMCInstrInfo()), RelaxTarget(new MCInst *),
Extender(nullptr) {}
MCObjectWriter *createObjectWriter(raw_pwrite_stream &OS) const override {
return createHexagonELFObjectWriter(OS, OSABI, CPU);
}
void setExtender(MCContext &Context) const {
if (Extender == nullptr)
const_cast<HexagonAsmBackend *>(this)->Extender = new (Context) MCInst;
}
MCInst *takeExtender() const {
assert(Extender != nullptr);
MCInst * Result = Extender;
const_cast<HexagonAsmBackend *>(this)->Extender = nullptr;
return Result;
}
unsigned getNumFixupKinds() const override {
return Hexagon::NumTargetFixupKinds;
}
const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override {
const static MCFixupKindInfo Infos[Hexagon::NumTargetFixupKinds] = {
// This table *must* be in same the order of fixup_* kinds in
// HexagonFixupKinds.h.
//
// namei offset bits flags
{"fixup_Hexagon_B22_PCREL", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
{"fixup_Hexagon_B15_PCREL", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
{"fixup_Hexagon_B7_PCREL", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
{"fixup_Hexagon_LO16", 0, 32, 0},
{"fixup_Hexagon_HI16", 0, 32, 0},
{"fixup_Hexagon_32", 0, 32, 0},
{"fixup_Hexagon_16", 0, 32, 0},
{"fixup_Hexagon_8", 0, 32, 0},
{"fixup_Hexagon_GPREL16_0", 0, 32, 0},
{"fixup_Hexagon_GPREL16_1", 0, 32, 0},
{"fixup_Hexagon_GPREL16_2", 0, 32, 0},
{"fixup_Hexagon_GPREL16_3", 0, 32, 0},
{"fixup_Hexagon_HL16", 0, 32, 0},
{"fixup_Hexagon_B13_PCREL", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
{"fixup_Hexagon_B9_PCREL", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
{"fixup_Hexagon_B32_PCREL_X", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
{"fixup_Hexagon_32_6_X", 0, 32, 0},
{"fixup_Hexagon_B22_PCREL_X", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
{"fixup_Hexagon_B15_PCREL_X", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
{"fixup_Hexagon_B13_PCREL_X", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
{"fixup_Hexagon_B9_PCREL_X", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
{"fixup_Hexagon_B7_PCREL_X", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
{"fixup_Hexagon_16_X", 0, 32, 0},
{"fixup_Hexagon_12_X", 0, 32, 0},
{"fixup_Hexagon_11_X", 0, 32, 0},
{"fixup_Hexagon_10_X", 0, 32, 0},
{"fixup_Hexagon_9_X", 0, 32, 0},
{"fixup_Hexagon_8_X", 0, 32, 0},
{"fixup_Hexagon_7_X", 0, 32, 0},
{"fixup_Hexagon_6_X", 0, 32, 0},
{"fixup_Hexagon_32_PCREL", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
{"fixup_Hexagon_COPY", 0, 32, 0},
{"fixup_Hexagon_GLOB_DAT", 0, 32, 0},
{"fixup_Hexagon_JMP_SLOT", 0, 32, 0},
{"fixup_Hexagon_RELATIVE", 0, 32, 0},
{"fixup_Hexagon_PLT_B22_PCREL", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
{"fixup_Hexagon_GOTREL_LO16", 0, 32, 0},
{"fixup_Hexagon_GOTREL_HI16", 0, 32, 0},
{"fixup_Hexagon_GOTREL_32", 0, 32, 0},
{"fixup_Hexagon_GOT_LO16", 0, 32, 0},
{"fixup_Hexagon_GOT_HI16", 0, 32, 0},
{"fixup_Hexagon_GOT_32", 0, 32, 0},
{"fixup_Hexagon_GOT_16", 0, 32, 0},
{"fixup_Hexagon_DTPMOD_32", 0, 32, 0},
{"fixup_Hexagon_DTPREL_LO16", 0, 32, 0},
{"fixup_Hexagon_DTPREL_HI16", 0, 32, 0},
{"fixup_Hexagon_DTPREL_32", 0, 32, 0},
{"fixup_Hexagon_DTPREL_16", 0, 32, 0},
{"fixup_Hexagon_GD_PLT_B22_PCREL", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
{"fixup_Hexagon_LD_PLT_B22_PCREL", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
{"fixup_Hexagon_GD_GOT_LO16", 0, 32, 0},
{"fixup_Hexagon_GD_GOT_HI16", 0, 32, 0},
{"fixup_Hexagon_GD_GOT_32", 0, 32, 0},
{"fixup_Hexagon_GD_GOT_16", 0, 32, 0},
{"fixup_Hexagon_LD_GOT_LO16", 0, 32, 0},
{"fixup_Hexagon_LD_GOT_HI16", 0, 32, 0},
{"fixup_Hexagon_LD_GOT_32", 0, 32, 0},
{"fixup_Hexagon_LD_GOT_16", 0, 32, 0},
{"fixup_Hexagon_IE_LO16", 0, 32, 0},
{"fixup_Hexagon_IE_HI16", 0, 32, 0},
{"fixup_Hexagon_IE_32", 0, 32, 0},
{"fixup_Hexagon_IE_16", 0, 32, 0},
{"fixup_Hexagon_IE_GOT_LO16", 0, 32, 0},
{"fixup_Hexagon_IE_GOT_HI16", 0, 32, 0},
{"fixup_Hexagon_IE_GOT_32", 0, 32, 0},
{"fixup_Hexagon_IE_GOT_16", 0, 32, 0},
{"fixup_Hexagon_TPREL_LO16", 0, 32, 0},
{"fixup_Hexagon_TPREL_HI16", 0, 32, 0},
{"fixup_Hexagon_TPREL_32", 0, 32, 0},
{"fixup_Hexagon_TPREL_16", 0, 32, 0},
{"fixup_Hexagon_6_PCREL_X", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
{"fixup_Hexagon_GOTREL_32_6_X", 0, 32, 0},
{"fixup_Hexagon_GOTREL_16_X", 0, 32, 0},
{"fixup_Hexagon_GOTREL_11_X", 0, 32, 0},
{"fixup_Hexagon_GOT_32_6_X", 0, 32, 0},
{"fixup_Hexagon_GOT_16_X", 0, 32, 0},
{"fixup_Hexagon_GOT_11_X", 0, 32, 0},
{"fixup_Hexagon_DTPREL_32_6_X", 0, 32, 0},
{"fixup_Hexagon_DTPREL_16_X", 0, 32, 0},
{"fixup_Hexagon_DTPREL_11_X", 0, 32, 0},
{"fixup_Hexagon_GD_GOT_32_6_X", 0, 32, 0},
{"fixup_Hexagon_GD_GOT_16_X", 0, 32, 0},
{"fixup_Hexagon_GD_GOT_11_X", 0, 32, 0},
{"fixup_Hexagon_LD_GOT_32_6_X", 0, 32, 0},
{"fixup_Hexagon_LD_GOT_16_X", 0, 32, 0},
{"fixup_Hexagon_LD_GOT_11_X", 0, 32, 0},
{"fixup_Hexagon_IE_32_6_X", 0, 32, 0},
{"fixup_Hexagon_IE_16_X", 0, 32, 0},
{"fixup_Hexagon_IE_GOT_32_6_X", 0, 32, 0},
{"fixup_Hexagon_IE_GOT_16_X", 0, 32, 0},
{"fixup_Hexagon_IE_GOT_11_X", 0, 32, 0},
{"fixup_Hexagon_TPREL_32_6_X", 0, 32, 0},
{"fixup_Hexagon_TPREL_16_X", 0, 32, 0},
{"fixup_Hexagon_TPREL_11_X", 0, 32, 0}};
if (Kind < FirstTargetFixupKind) {
return MCAsmBackend::getFixupKindInfo(Kind);
}
assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
"Invalid kind!");
return Infos[Kind - FirstTargetFixupKind];
}
void applyFixup(MCFixup const & /*Fixup*/, char * /*Data*/,
unsigned /*DataSize*/, uint64_t /*Value*/,
bool /*IsPCRel*/) const override {
return;
}
bool isInstRelaxable(MCInst const &HMI) const {
const MCInstrDesc &MCID = HexagonMCInstrInfo::getDesc(*MCII, HMI);
bool Relaxable = false;
// Branches and loop-setup insns are handled as necessary by relaxation.
if (llvm::HexagonMCInstrInfo::getType(*MCII, HMI) == HexagonII::TypeJ ||
(llvm::HexagonMCInstrInfo::getType(*MCII, HMI) == HexagonII::TypeNV &&
MCID.isBranch()) ||
(llvm::HexagonMCInstrInfo::getType(*MCII, HMI) == HexagonII::TypeCR &&
HMI.getOpcode() != Hexagon::C4_addipc))
if (HexagonMCInstrInfo::isExtendable(*MCII, HMI))
Relaxable = true;
return Relaxable;
}
/// MayNeedRelaxation - Check whether the given instruction may need
/// relaxation.
///
/// \param Inst - The instruction to test.
bool mayNeedRelaxation(MCInst const &Inst) const override {
assert(HexagonMCInstrInfo::isBundle(Inst));
bool PreviousIsExtender = false;
for (auto const &I : HexagonMCInstrInfo::bundleInstructions(Inst)) {
auto const &Inst = *I.getInst();
if (!PreviousIsExtender) {
if (isInstRelaxable(Inst))
return true;
}
PreviousIsExtender = HexagonMCInstrInfo::isImmext(Inst);
}
return false;
}
/// fixupNeedsRelaxation - Target specific predicate for whether a given
/// fixup requires the associated instruction to be relaxed.
bool fixupNeedsRelaxationAdvanced(const MCFixup &Fixup, bool Resolved,
uint64_t Value,
const MCRelaxableFragment *DF,
const MCAsmLayout &Layout) const override {
MCInst const &MCB = DF->getInst();
assert(HexagonMCInstrInfo::isBundle(MCB));
*RelaxTarget = nullptr;
MCInst &MCI = const_cast<MCInst &>(HexagonMCInstrInfo::instruction(
MCB, Fixup.getOffset() / HEXAGON_INSTR_SIZE));
// If we cannot resolve the fixup value, it requires relaxation.
if (!Resolved) {
switch ((unsigned)Fixup.getKind()) {
case fixup_Hexagon_B22_PCREL:
// GetFixupCount assumes B22 won't relax
// Fallthrough
default:
return false;
break;
case fixup_Hexagon_B13_PCREL:
case fixup_Hexagon_B15_PCREL:
case fixup_Hexagon_B9_PCREL:
case fixup_Hexagon_B7_PCREL: {
if (HexagonMCInstrInfo::bundleSize(MCB) < HEXAGON_PACKET_SIZE) {
++relaxedCnt;
*RelaxTarget = &MCI;
setExtender(Layout.getAssembler().getContext());
return true;
} else {
return false;
}
break;
}
}
}
bool Relaxable = isInstRelaxable(MCI);
if (Relaxable == false)
return false;
MCFixupKind Kind = Fixup.getKind();
int64_t sValue = Value;
int64_t maxValue;
switch ((unsigned)Kind) {
case fixup_Hexagon_B7_PCREL:
maxValue = 1 << 8;
break;
case fixup_Hexagon_B9_PCREL:
maxValue = 1 << 10;
break;
case fixup_Hexagon_B15_PCREL:
maxValue = 1 << 16;
break;
case fixup_Hexagon_B22_PCREL:
maxValue = 1 << 23;
break;
default:
maxValue = INT64_MAX;
break;
}
bool isFarAway = -maxValue > sValue || sValue > maxValue - 1;
if (isFarAway) {
if (HexagonMCInstrInfo::bundleSize(MCB) < HEXAGON_PACKET_SIZE) {
++relaxedCnt;
*RelaxTarget = &MCI;
setExtender(Layout.getAssembler().getContext());
return true;
}
}
return false;
}
/// Simple predicate for targets where !Resolved implies requiring relaxation
bool fixupNeedsRelaxation(const MCFixup &Fixup, uint64_t Value,
const MCRelaxableFragment *DF,
const MCAsmLayout &Layout) const override {
llvm_unreachable("Handled by fixupNeedsRelaxationAdvanced");
}
void relaxInstruction(MCInst const & Inst,
MCInst & Res) const override {
assert(HexagonMCInstrInfo::isBundle(Inst) &&
"Hexagon relaxInstruction only works on bundles");
Res = HexagonMCInstrInfo::createBundle();
// Copy the results into the bundle.
bool Update = false;
for (auto &I : HexagonMCInstrInfo::bundleInstructions(Inst)) {
MCInst &CrntHMI = const_cast<MCInst &>(*I.getInst());
// if immediate extender needed, add it in
if (*RelaxTarget == &CrntHMI) {
Update = true;
assert((HexagonMCInstrInfo::bundleSize(Res) < HEXAGON_PACKET_SIZE) &&
"No room to insert extender for relaxation");
MCInst *HMIx = takeExtender();
*HMIx = HexagonMCInstrInfo::deriveExtender(
*MCII, CrntHMI,
HexagonMCInstrInfo::getExtendableOperand(*MCII, CrntHMI));
Res.addOperand(MCOperand::createInst(HMIx));
*RelaxTarget = nullptr;
}
// now copy over the original instruction(the one we may have extended)
Res.addOperand(MCOperand::createInst(I.getInst()));
}
(void)Update;
assert(Update && "Didn't find relaxation target");
}
bool writeNopData(uint64_t Count,
MCObjectWriter * OW) const override {
static const uint32_t Nopcode = 0x7f000000, // Hard-coded NOP.
ParseIn = 0x00004000, // In packet parse-bits.
ParseEnd = 0x0000c000; // End of packet parse-bits.
while(Count % HEXAGON_INSTR_SIZE) {
DEBUG(dbgs() << "Alignment not a multiple of the instruction size:" <<
Count % HEXAGON_INSTR_SIZE << "/" << HEXAGON_INSTR_SIZE << "\n");
--Count;
OW->write8(0);
}
while(Count) {
Count -= HEXAGON_INSTR_SIZE;
// Close the packet whenever a multiple of the maximum packet size remains
uint32_t ParseBits = (Count % (HEXAGON_PACKET_SIZE * HEXAGON_INSTR_SIZE))?
ParseIn: ParseEnd;
OW->write32(Nopcode | ParseBits);
}
return true;
}
};
} // end anonymous namespace
namespace llvm {
MCAsmBackend *createHexagonAsmBackend(Target const &T,
MCRegisterInfo const & /*MRI*/,
const Triple &TT, StringRef CPU) {
uint8_t OSABI = MCELFObjectTargetWriter::getOSABI(TT.getOS());
return new HexagonAsmBackend(T, OSABI, CPU);
}
}
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