BPFMCTargetDesc.cpp
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//===-- BPFMCTargetDesc.cpp - BPF Target Descriptions ---------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file provides BPF specific target descriptions.
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/BPFMCTargetDesc.h"
#include "MCTargetDesc/BPFInstPrinter.h"
#include "MCTargetDesc/BPFMCAsmInfo.h"
#include "TargetInfo/BPFTargetInfo.h"
#include "llvm/MC/MCInstrAnalysis.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/Support/Host.h"
#include "llvm/Support/TargetRegistry.h"
#define GET_INSTRINFO_MC_DESC
#include "BPFGenInstrInfo.inc"
#define GET_SUBTARGETINFO_MC_DESC
#include "BPFGenSubtargetInfo.inc"
#define GET_REGINFO_MC_DESC
#include "BPFGenRegisterInfo.inc"
using namespace llvm;
static MCInstrInfo *createBPFMCInstrInfo() {
MCInstrInfo *X = new MCInstrInfo();
InitBPFMCInstrInfo(X);
return X;
}
static MCRegisterInfo *createBPFMCRegisterInfo(const Triple &TT) {
MCRegisterInfo *X = new MCRegisterInfo();
InitBPFMCRegisterInfo(X, BPF::R11 /* RAReg doesn't exist */);
return X;
}
static MCSubtargetInfo *createBPFMCSubtargetInfo(const Triple &TT,
StringRef CPU, StringRef FS) {
return createBPFMCSubtargetInfoImpl(TT, CPU, FS);
}
static MCStreamer *createBPFMCStreamer(const Triple &T, MCContext &Ctx,
std::unique_ptr<MCAsmBackend> &&MAB,
std::unique_ptr<MCObjectWriter> &&OW,
std::unique_ptr<MCCodeEmitter> &&Emitter,
bool RelaxAll) {
return createELFStreamer(Ctx, std::move(MAB), std::move(OW), std::move(Emitter),
RelaxAll);
}
static MCInstPrinter *createBPFMCInstPrinter(const Triple &T,
unsigned SyntaxVariant,
const MCAsmInfo &MAI,
const MCInstrInfo &MII,
const MCRegisterInfo &MRI) {
if (SyntaxVariant == 0)
return new BPFInstPrinter(MAI, MII, MRI);
return nullptr;
}
namespace {
class BPFMCInstrAnalysis : public MCInstrAnalysis {
public:
explicit BPFMCInstrAnalysis(const MCInstrInfo *Info)
: MCInstrAnalysis(Info) {}
bool evaluateBranch(const MCInst &Inst, uint64_t Addr, uint64_t Size,
uint64_t &Target) const override {
// The target is the 3rd operand of cond inst and the 1st of uncond inst.
int16_t Imm;
if (isConditionalBranch(Inst)) {
Imm = Inst.getOperand(2).getImm();
} else if (isUnconditionalBranch(Inst))
Imm = Inst.getOperand(0).getImm();
else
return false;
Target = Addr + Size + Imm * Size;
return true;
}
};
} // end anonymous namespace
static MCInstrAnalysis *createBPFInstrAnalysis(const MCInstrInfo *Info) {
return new BPFMCInstrAnalysis(Info);
}
extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeBPFTargetMC() {
for (Target *T :
{&getTheBPFleTarget(), &getTheBPFbeTarget(), &getTheBPFTarget()}) {
// Register the MC asm info.
RegisterMCAsmInfo<BPFMCAsmInfo> X(*T);
// Register the MC instruction info.
TargetRegistry::RegisterMCInstrInfo(*T, createBPFMCInstrInfo);
// Register the MC register info.
TargetRegistry::RegisterMCRegInfo(*T, createBPFMCRegisterInfo);
// Register the MC subtarget info.
TargetRegistry::RegisterMCSubtargetInfo(*T,
createBPFMCSubtargetInfo);
// Register the object streamer
TargetRegistry::RegisterELFStreamer(*T, createBPFMCStreamer);
// Register the MCInstPrinter.
TargetRegistry::RegisterMCInstPrinter(*T, createBPFMCInstPrinter);
// Register the MC instruction analyzer.
TargetRegistry::RegisterMCInstrAnalysis(*T, createBPFInstrAnalysis);
}
// Register the MC code emitter
TargetRegistry::RegisterMCCodeEmitter(getTheBPFleTarget(),
createBPFMCCodeEmitter);
TargetRegistry::RegisterMCCodeEmitter(getTheBPFbeTarget(),
createBPFbeMCCodeEmitter);
// Register the ASM Backend
TargetRegistry::RegisterMCAsmBackend(getTheBPFleTarget(),
createBPFAsmBackend);
TargetRegistry::RegisterMCAsmBackend(getTheBPFbeTarget(),
createBPFbeAsmBackend);
if (sys::IsLittleEndianHost) {
TargetRegistry::RegisterMCCodeEmitter(getTheBPFTarget(),
createBPFMCCodeEmitter);
TargetRegistry::RegisterMCAsmBackend(getTheBPFTarget(),
createBPFAsmBackend);
} else {
TargetRegistry::RegisterMCCodeEmitter(getTheBPFTarget(),
createBPFbeMCCodeEmitter);
TargetRegistry::RegisterMCAsmBackend(getTheBPFTarget(),
createBPFbeAsmBackend);
}
}