1//===-- M68kMCTargetDesc.cpp - M68k Target Descriptions ---------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8///
9/// \file
10/// This file provides M68k target specific descriptions.
11///
12//===----------------------------------------------------------------------===//
13
14#include "M68kMCTargetDesc.h"
15#include "M68kInstPrinter.h"
16#include "M68kMCAsmInfo.h"
17#include "TargetInfo/M68kTargetInfo.h"
18
19#include "llvm/MC/MCELFStreamer.h"
20#include "llvm/MC/MCInstPrinter.h"
21#include "llvm/MC/MCInstrInfo.h"
22#include "llvm/MC/MCRegisterInfo.h"
23#include "llvm/MC/MCSubtargetInfo.h"
24#include "llvm/MC/MCSymbol.h"
25#include "llvm/MC/MachineLocation.h"
26#include "llvm/MC/TargetRegistry.h"
27#include "llvm/Support/CommandLine.h"
28#include "llvm/Support/ErrorHandling.h"
29#include "llvm/Support/FormattedStream.h"
30
31using namespace llvm;
32
33#define GET_INSTRINFO_MC_DESC
34#define ENABLE_INSTR_PREDICATE_VERIFIER
35#include "M68kGenInstrInfo.inc"
36
37#define GET_SUBTARGETINFO_MC_DESC
38#include "M68kGenSubtargetInfo.inc"
39
40#define GET_REGINFO_MC_DESC
41#include "M68kGenRegisterInfo.inc"
42
43// TODO Implement feature set parsing logics
44static std::string ParseM68kTriple(const Triple &TT, StringRef CPU) {
45  return "";
46}
47
48static MCInstrInfo *createM68kMCInstrInfo() {
49  MCInstrInfo *X = new MCInstrInfo();
50  InitM68kMCInstrInfo(X); // defined in M68kGenInstrInfo.inc
51  return X;
52}
53
54static MCRegisterInfo *createM68kMCRegisterInfo(const Triple &TT) {
55  MCRegisterInfo *X = new MCRegisterInfo();
56  InitM68kMCRegisterInfo(X, llvm::M68k::A0, 0, 0, llvm::M68k::PC);
57  return X;
58}
59
60static MCSubtargetInfo *createM68kMCSubtargetInfo(const Triple &TT,
61                                                  StringRef CPU, StringRef FS) {
62  std::string ArchFS = ParseM68kTriple(TT, CPU);
63  if (!FS.empty()) {
64    if (!ArchFS.empty()) {
65      ArchFS = (ArchFS + "," + FS).str();
66    } else {
67      ArchFS = FS.str();
68    }
69  }
70  return createM68kMCSubtargetInfoImpl(TT, CPU, /*TuneCPU=*/CPU, ArchFS);
71}
72
73static MCAsmInfo *createM68kMCAsmInfo(const MCRegisterInfo &MRI,
74                                      const Triple &TT,
75                                      const MCTargetOptions &TO) {
76  MCAsmInfo *MAI = new M68kELFMCAsmInfo(TT);
77
78  // Initialize initial frame state.
79  // Calculate amount of bytes used for return address storing
80  int StackGrowth = -4;
81
82  // Initial state of the frame pointer is SP+StackGrowth.
83  // TODO: Add tests for `cfi_*` directives
84  MCCFIInstruction Inst = MCCFIInstruction::cfiDefCfa(
85      nullptr, MRI.getDwarfRegNum(llvm::M68k::SP, true), -StackGrowth);
86  MAI->addInitialFrameState(Inst);
87
88  // Add return address to move list
89  Inst = MCCFIInstruction::createOffset(
90      nullptr, MRI.getDwarfRegNum(M68k::PC, true), StackGrowth);
91  MAI->addInitialFrameState(Inst);
92
93  return MAI;
94}
95
96static MCRelocationInfo *createM68kMCRelocationInfo(const Triple &TheTriple,
97                                                    MCContext &Ctx) {
98  // Default to the stock relocation info.
99  return llvm::createMCRelocationInfo(TheTriple, Ctx);
100}
101
102static MCInstPrinter *createM68kMCInstPrinter(const Triple &T,
103                                              unsigned SyntaxVariant,
104                                              const MCAsmInfo &MAI,
105                                              const MCInstrInfo &MII,
106                                              const MCRegisterInfo &MRI) {
107  return new M68kInstPrinter(MAI, MII, MRI);
108}
109
110extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeM68kTargetMC() {
111  Target &T = getTheM68kTarget();
112
113  // Register the MC asm info.
114  RegisterMCAsmInfoFn X(T, createM68kMCAsmInfo);
115
116  // Register the MC instruction info.
117  TargetRegistry::RegisterMCInstrInfo(T, createM68kMCInstrInfo);
118
119  // Register the MC register info.
120  TargetRegistry::RegisterMCRegInfo(T, createM68kMCRegisterInfo);
121
122  // Register the MC subtarget info.
123  TargetRegistry::RegisterMCSubtargetInfo(T, createM68kMCSubtargetInfo);
124
125  // Register the code emitter.
126  TargetRegistry::RegisterMCCodeEmitter(T, createM68kMCCodeEmitter);
127
128  // Register the MCInstPrinter.
129  TargetRegistry::RegisterMCInstPrinter(T, createM68kMCInstPrinter);
130
131  // Register the MC relocation info.
132  TargetRegistry::RegisterMCRelocationInfo(T, createM68kMCRelocationInfo);
133
134  // Register the asm backend.
135  TargetRegistry::RegisterMCAsmBackend(T, createM68kAsmBackend);
136}
137