//===-- 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/HexagonMCChecker.h"
#include "MCTargetDesc/HexagonMCCodeEmitter.h"
#include "MCTargetDesc/HexagonMCInstrInfo.h"
#include "MCTargetDesc/HexagonMCShuffler.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/MC/MCObjectWriter.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/TargetRegistry.h"
#include <sstream>
using namespace llvm;
using namespace Hexagon;
#define DEBUG_TYPE "hexagon-asm-backend"
static cl::opt<bool> DisableFixup
("mno-fixup", cl::desc("Disable fixing up resolved relocations for Hexagon"));
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;
void ReplaceInstruction(MCCodeEmitter &E, MCRelaxableFragment &RF,
MCInst &HMB) const {
SmallVector<MCFixup, 4> Fixups;
SmallString<256> Code;
raw_svector_ostream VecOS(Code);
E.encodeInstruction(HMB, VecOS, Fixups, RF.getSubtargetInfo());
// Update the fragment.
RF.setInst(HMB);
RF.getContents() = Code;
RF.getFixups() = Fixups;
}
public:
HexagonAsmBackend(const Target &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];
}
/// processFixupValue - Target hook to adjust the literal value of a fixup
/// if necessary. IsResolved signals whether the caller believes a relocation
/// is needed; the target can modify the value. The default does nothing.
void processFixupValue(const MCAssembler &Asm, const MCAsmLayout &Layout,
const MCFixup &Fixup, const MCFragment *DF,
const MCValue &Target, uint64_t &Value,
bool &IsResolved) override {
MCFixupKind Kind = Fixup.getKind();
switch((unsigned)Kind) {
default:
llvm_unreachable("Unknown Fixup Kind!");
case fixup_Hexagon_LO16:
case fixup_Hexagon_HI16:
case fixup_Hexagon_16:
case fixup_Hexagon_8:
case fixup_Hexagon_GPREL16_0:
case fixup_Hexagon_GPREL16_1:
case fixup_Hexagon_GPREL16_2:
case fixup_Hexagon_GPREL16_3:
case fixup_Hexagon_HL16:
case fixup_Hexagon_32_6_X:
case fixup_Hexagon_16_X:
case fixup_Hexagon_12_X:
case fixup_Hexagon_11_X:
case fixup_Hexagon_10_X:
case fixup_Hexagon_9_X:
case fixup_Hexagon_8_X:
case fixup_Hexagon_7_X:
case fixup_Hexagon_6_X:
case fixup_Hexagon_COPY:
case fixup_Hexagon_GLOB_DAT:
case fixup_Hexagon_JMP_SLOT:
case fixup_Hexagon_RELATIVE:
case fixup_Hexagon_PLT_B22_PCREL:
case fixup_Hexagon_GOTREL_LO16:
case fixup_Hexagon_GOTREL_HI16:
case fixup_Hexagon_GOTREL_32:
case fixup_Hexagon_GOT_LO16:
case fixup_Hexagon_GOT_HI16:
case fixup_Hexagon_GOT_32:
case fixup_Hexagon_GOT_16:
case fixup_Hexagon_DTPMOD_32:
case fixup_Hexagon_DTPREL_LO16:
case fixup_Hexagon_DTPREL_HI16:
case fixup_Hexagon_DTPREL_32:
case fixup_Hexagon_DTPREL_16:
case fixup_Hexagon_GD_PLT_B22_PCREL:
case fixup_Hexagon_LD_PLT_B22_PCREL:
case fixup_Hexagon_GD_GOT_LO16:
case fixup_Hexagon_GD_GOT_HI16:
case fixup_Hexagon_GD_GOT_32:
case fixup_Hexagon_GD_GOT_16:
case fixup_Hexagon_LD_GOT_LO16:
case fixup_Hexagon_LD_GOT_HI16:
case fixup_Hexagon_LD_GOT_32:
case fixup_Hexagon_LD_GOT_16:
case fixup_Hexagon_IE_LO16:
case fixup_Hexagon_IE_HI16:
case fixup_Hexagon_IE_32:
case fixup_Hexagon_IE_16:
case fixup_Hexagon_IE_GOT_LO16:
case fixup_Hexagon_IE_GOT_HI16:
case fixup_Hexagon_IE_GOT_32:
case fixup_Hexagon_IE_GOT_16:
case fixup_Hexagon_TPREL_LO16:
case fixup_Hexagon_TPREL_HI16:
case fixup_Hexagon_TPREL_32:
case fixup_Hexagon_TPREL_16:
case fixup_Hexagon_GOTREL_32_6_X:
case fixup_Hexagon_GOTREL_16_X:
case fixup_Hexagon_GOTREL_11_X:
case fixup_Hexagon_GOT_32_6_X:
case fixup_Hexagon_GOT_16_X:
case fixup_Hexagon_GOT_11_X:
case fixup_Hexagon_DTPREL_32_6_X:
case fixup_Hexagon_DTPREL_16_X:
case fixup_Hexagon_DTPREL_11_X:
case fixup_Hexagon_GD_GOT_32_6_X:
case fixup_Hexagon_GD_GOT_16_X:
case fixup_Hexagon_GD_GOT_11_X:
case fixup_Hexagon_LD_GOT_32_6_X:
case fixup_Hexagon_LD_GOT_16_X:
case fixup_Hexagon_LD_GOT_11_X:
case fixup_Hexagon_IE_32_6_X:
case fixup_Hexagon_IE_16_X:
case fixup_Hexagon_IE_GOT_32_6_X:
case fixup_Hexagon_IE_GOT_16_X:
case fixup_Hexagon_IE_GOT_11_X:
case fixup_Hexagon_TPREL_32_6_X:
case fixup_Hexagon_TPREL_16_X:
case fixup_Hexagon_TPREL_11_X:
case fixup_Hexagon_32_PCREL:
case fixup_Hexagon_6_PCREL_X:
case fixup_Hexagon_23_REG:
// These relocations should always have a relocation recorded
IsResolved = false;
return;
case fixup_Hexagon_B22_PCREL:
//IsResolved = false;
break;
case fixup_Hexagon_B13_PCREL:
case fixup_Hexagon_B13_PCREL_X:
case fixup_Hexagon_B32_PCREL_X:
case fixup_Hexagon_B22_PCREL_X:
case fixup_Hexagon_B15_PCREL:
case fixup_Hexagon_B15_PCREL_X:
case fixup_Hexagon_B9_PCREL:
case fixup_Hexagon_B9_PCREL_X:
case fixup_Hexagon_B7_PCREL:
case fixup_Hexagon_B7_PCREL_X:
if (DisableFixup)
IsResolved = false;
break;
case FK_Data_1:
case FK_Data_2:
case FK_Data_4:
case FK_PCRel_4:
case fixup_Hexagon_32:
// Leave these relocations alone as they are used for EH.
return;
}
}
/// getFixupKindNumBytes - The number of bytes the fixup may change.
static unsigned getFixupKindNumBytes(unsigned Kind) {
switch (Kind) {
default:
return 0;
case FK_Data_1:
return 1;
case FK_Data_2:
return 2;
case FK_Data_4: // this later gets mapped to R_HEX_32
case FK_PCRel_4: // this later gets mapped to R_HEX_32_PCREL
case fixup_Hexagon_32:
case fixup_Hexagon_B32_PCREL_X:
case fixup_Hexagon_B22_PCREL:
case fixup_Hexagon_B22_PCREL_X:
case fixup_Hexagon_B15_PCREL:
case fixup_Hexagon_B15_PCREL_X:
case fixup_Hexagon_B13_PCREL:
case fixup_Hexagon_B13_PCREL_X:
case fixup_Hexagon_B9_PCREL:
case fixup_Hexagon_B9_PCREL_X:
case fixup_Hexagon_B7_PCREL:
case fixup_Hexagon_B7_PCREL_X:
return 4;
}
}
// Make up for left shift when encoding the operand.
static uint64_t adjustFixupValue(MCFixupKind Kind, uint64_t Value) {
switch((unsigned)Kind) {
default:
break;
case fixup_Hexagon_B7_PCREL:
case fixup_Hexagon_B9_PCREL:
case fixup_Hexagon_B13_PCREL:
case fixup_Hexagon_B15_PCREL:
case fixup_Hexagon_B22_PCREL:
Value >>= 2;
break;
case fixup_Hexagon_B7_PCREL_X:
case fixup_Hexagon_B9_PCREL_X:
case fixup_Hexagon_B13_PCREL_X:
case fixup_Hexagon_B15_PCREL_X:
case fixup_Hexagon_B22_PCREL_X:
Value &= 0x3f;
break;
case fixup_Hexagon_B32_PCREL_X:
Value >>= 6;
break;
}
return (Value);
}
void HandleFixupError(const int bits, const int align_bits,
const int64_t FixupValue, const char *fixupStr) const {
// Error: value 1124 out of range: -1024-1023 when resolving
// symbol in file xprtsock.S
const APInt IntMin = APInt::getSignedMinValue(bits+align_bits);
const APInt IntMax = APInt::getSignedMaxValue(bits+align_bits);
std::stringstream errStr;
errStr << "\nError: value " <<
FixupValue <<
" out of range: " <<
IntMin.getSExtValue() <<
"-" <<
IntMax.getSExtValue() <<
" when resolving " <<
fixupStr <<
" fixup\n";
llvm_unreachable(errStr.str().c_str());
}
/// ApplyFixup - Apply the \arg Value for given \arg Fixup into the provided
/// data fragment, at the offset specified by the fixup and following the
/// fixup kind as appropriate.
void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
uint64_t FixupValue, bool IsPCRel) const override {
// When FixupValue is 0 the relocation is external and there
// is nothing for us to do.
if (!FixupValue) return;
MCFixupKind Kind = Fixup.getKind();
uint64_t Value;
uint32_t InstMask;
uint32_t Reloc;
// LLVM gives us an encoded value, we have to convert it back
// to a real offset before we can use it.
uint32_t Offset = Fixup.getOffset();
unsigned NumBytes = getFixupKindNumBytes(Kind);
assert(Offset + NumBytes <= DataSize && "Invalid fixup offset!");
char *InstAddr = Data + Offset;
Value = adjustFixupValue(Kind, FixupValue);
if(!Value)
return;
int sValue = (int)Value;
switch((unsigned)Kind) {
default:
return;
case fixup_Hexagon_B7_PCREL:
if (!(isIntN(7, sValue)))
HandleFixupError(7, 2, (int64_t)FixupValue, "B7_PCREL");
case fixup_Hexagon_B7_PCREL_X:
InstMask = 0x00001f18; // Word32_B7
Reloc = (((Value >> 2) & 0x1f) << 8) | // Value 6-2 = Target 12-8
((Value & 0x3) << 3); // Value 1-0 = Target 4-3
break;
case fixup_Hexagon_B9_PCREL:
if (!(isIntN(9, sValue)))
HandleFixupError(9, 2, (int64_t)FixupValue, "B9_PCREL");
case fixup_Hexagon_B9_PCREL_X:
InstMask = 0x003000fe; // Word32_B9
Reloc = (((Value >> 7) & 0x3) << 20) | // Value 8-7 = Target 21-20
((Value & 0x7f) << 1); // Value 6-0 = Target 7-1
break;
// Since the existing branches that use this relocation cannot be
// extended, they should only be fixed up if the target is within range.
case fixup_Hexagon_B13_PCREL:
if (!(isIntN(13, sValue)))
HandleFixupError(13, 2, (int64_t)FixupValue, "B13_PCREL");
case fixup_Hexagon_B13_PCREL_X:
InstMask = 0x00202ffe; // Word32_B13
Reloc = (((Value >> 12) & 0x1) << 21) | // Value 12 = Target 21
(((Value >> 11) & 0x1) << 13) | // Value 11 = Target 13
((Value & 0x7ff) << 1); // Value 10-0 = Target 11-1
break;
case fixup_Hexagon_B15_PCREL:
if (!(isIntN(15, sValue)))
HandleFixupError(15, 2, (int64_t)FixupValue, "B15_PCREL");
case fixup_Hexagon_B15_PCREL_X:
InstMask = 0x00df20fe; // Word32_B15
Reloc = (((Value >> 13) & 0x3) << 22) | // Value 14-13 = Target 23-22
(((Value >> 8) & 0x1f) << 16) | // Value 12-8 = Target 20-16
(((Value >> 7) & 0x1) << 13) | // Value 7 = Target 13
((Value & 0x7f) << 1); // Value 6-0 = Target 7-1
break;
case fixup_Hexagon_B22_PCREL:
if (!(isIntN(22, sValue)))
HandleFixupError(22, 2, (int64_t)FixupValue, "B22_PCREL");
case fixup_Hexagon_B22_PCREL_X:
InstMask = 0x01ff3ffe; // Word32_B22
Reloc = (((Value >> 13) & 0x1ff) << 16) | // Value 21-13 = Target 24-16
((Value & 0x1fff) << 1); // Value 12-0 = Target 13-1
break;
case fixup_Hexagon_B32_PCREL_X:
InstMask = 0x0fff3fff; // Word32_X26
Reloc = (((Value >> 14) & 0xfff) << 16) | // Value 25-14 = Target 27-16
(Value & 0x3fff); // Value 13-0 = Target 13-0
break;
case FK_Data_1:
case FK_Data_2:
case FK_Data_4:
case fixup_Hexagon_32:
InstMask = 0xffffffff; // Word32
Reloc = Value;
break;
}
DEBUG(dbgs() << "Name=" << getFixupKindInfo(Kind).Name << "(" <<
(unsigned)Kind << ")\n");
DEBUG(uint32_t OldData = 0;
for (unsigned i = 0; i < NumBytes; i++)
OldData |= (InstAddr[i] << (i * 8)) & (0xff << (i * 8));
dbgs() << "\tBValue=0x"; dbgs().write_hex(Value) <<
": AValue=0x"; dbgs().write_hex(FixupValue) <<
": Offset=" << Offset <<
": Size=" << DataSize <<
": OInst=0x"; dbgs().write_hex(OldData) <<
": Reloc=0x"; dbgs().write_hex(Reloc););
// For each byte of the fragment that the fixup touches, mask in the
// bits from the fixup value. The Value has been "split up" into the
// appropriate bitfields above.
for (unsigned i = 0; i < NumBytes; i++){
InstAddr[i] &= uint8_t(~InstMask >> (i * 8)) & 0xff; // Clear reloc bits
InstAddr[i] |= uint8_t(Reloc >> (i * 8)) & 0xff; // Apply new reloc
}
DEBUG(uint32_t NewData = 0;
for (unsigned i = 0; i < NumBytes; i++)
NewData |= (InstAddr[i] << (i * 8)) & (0xff << (i * 8));
dbgs() << ": NInst=0x"; dbgs().write_hex(NewData) << "\n";);
}
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::TypeCOMPOUND &&
MCID.isBranch()) ||
(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;
MCOperand const &Operand =
HMI.getOperand(HexagonMCInstrInfo::getExtendableOp(*MCII, HMI));
if (HexagonMCInstrInfo::mustNotExtend(*Operand.getExpr()))
Relaxable = false;
}
return Relaxable;
}
/// MayNeedRelaxation - Check whether the given instruction may need
/// relaxation.
///
/// \param Inst - The instruction to test.
bool mayNeedRelaxation(MCInst const &Inst) const override {
return true;
}
/// 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));
bool Relaxable = isInstRelaxable(MCI);
if (Relaxable == false)
return false;
// 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;
}
}
}
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(const MCInst &Inst, const MCSubtargetInfo &STI,
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;
}
void finishLayout(MCAssembler const &Asm,
MCAsmLayout &Layout) const override {
for (auto I : Layout.getSectionOrder()) {
auto &Fragments = I->getFragmentList();
for (auto &J : Fragments) {
switch (J.getKind()) {
default:
break;
case MCFragment::FT_Align: {
auto Size = Asm.computeFragmentSize(Layout, J);
for (auto K = J.getIterator();
K != Fragments.begin() && Size >= HEXAGON_PACKET_SIZE;) {
--K;
switch (K->getKind()) {
default:
break;
case MCFragment::FT_Align: {
// Don't pad before other alignments
Size = 0;
break;
}
case MCFragment::FT_Relaxable: {
auto &RF = cast<MCRelaxableFragment>(*K);
auto &Inst = const_cast<MCInst &>(RF.getInst());
while (Size > 0 && HexagonMCInstrInfo::bundleSize(Inst) < 4) {
MCInst *Nop = new (Asm.getContext()) MCInst;
Nop->setOpcode(Hexagon::A2_nop);
Inst.addOperand(MCOperand::createInst(Nop));
Size -= 4;
if (!HexagonMCChecker(
*MCII, RF.getSubtargetInfo(), Inst, Inst,
*Asm.getContext().getRegisterInfo()).check()) {
Inst.erase(Inst.end() - 1);
Size = 0;
}
}
bool Error = HexagonMCShuffle(*MCII, RF.getSubtargetInfo(), Inst);
//assert(!Error);
(void)Error;
ReplaceInstruction(Asm.getEmitter(), RF, Inst);
Layout.invalidateFragmentsFrom(&RF);
Size = 0; // Only look back one instruction
break;
}
}
}
}
}
}
}
}
};
} // 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);
}
}