1 //===-- BPFMCTargetDesc.cpp - BPF Target Descriptions ---------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file provides BPF specific target descriptions.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "BPF.h"
15 #include "BPFMCTargetDesc.h"
16 #include "BPFMCAsmInfo.h"
17 #include "InstPrinter/BPFInstPrinter.h"
18 #include "llvm/MC/MCCodeGenInfo.h"
19 #include "llvm/MC/MCInstrInfo.h"
20 #include "llvm/MC/MCRegisterInfo.h"
21 #include "llvm/MC/MCStreamer.h"
22 #include "llvm/MC/MCSubtargetInfo.h"
23 #include "llvm/Support/ErrorHandling.h"
24 #include "llvm/Support/TargetRegistry.h"
25 
26 #define GET_INSTRINFO_MC_DESC
27 #include "BPFGenInstrInfo.inc"
28 
29 #define GET_SUBTARGETINFO_MC_DESC
30 #include "BPFGenSubtargetInfo.inc"
31 
32 #define GET_REGINFO_MC_DESC
33 #include "BPFGenRegisterInfo.inc"
34 
35 using namespace llvm;
36 
37 static MCInstrInfo *createBPFMCInstrInfo() {
38   MCInstrInfo *X = new MCInstrInfo();
39   InitBPFMCInstrInfo(X);
40   return X;
41 }
42 
43 static MCRegisterInfo *createBPFMCRegisterInfo(const Triple &TT) {
44   MCRegisterInfo *X = new MCRegisterInfo();
45   InitBPFMCRegisterInfo(X, BPF::R11 /* RAReg doesn't exist */);
46   return X;
47 }
48 
49 static MCSubtargetInfo *createBPFMCSubtargetInfo(const Triple &TT,
50                                                  StringRef CPU, StringRef FS) {
51   MCSubtargetInfo *X = new MCSubtargetInfo();
52   InitBPFMCSubtargetInfo(X, TT, CPU, FS);
53   return X;
54 }
55 
56 static MCCodeGenInfo *createBPFMCCodeGenInfo(const Triple &TT, Reloc::Model RM,
57                                              CodeModel::Model CM,
58                                              CodeGenOpt::Level OL) {
59   MCCodeGenInfo *X = new MCCodeGenInfo();
60   X->initMCCodeGenInfo(RM, CM, OL);
61   return X;
62 }
63 
64 static MCStreamer *createBPFMCStreamer(const Triple &T,
65                                        MCContext &Ctx, MCAsmBackend &MAB,
66                                        raw_pwrite_stream &OS, MCCodeEmitter *Emitter,
67                                        bool RelaxAll) {
68   return createELFStreamer(Ctx, MAB, OS, Emitter, RelaxAll);
69 }
70 
71 static MCInstPrinter *createBPFMCInstPrinter(const Triple &T,
72                                              unsigned SyntaxVariant,
73                                              const MCAsmInfo &MAI,
74                                              const MCInstrInfo &MII,
75                                              const MCRegisterInfo &MRI) {
76   if (SyntaxVariant == 0)
77     return new BPFInstPrinter(MAI, MII, MRI);
78   return 0;
79 }
80 
81 extern "C" void LLVMInitializeBPFTargetMC() {
82   for (Target *T : {&TheBPFleTarget, &TheBPFbeTarget, &TheBPFTarget}) {
83     // Register the MC asm info.
84     RegisterMCAsmInfo<BPFMCAsmInfo> X(*T);
85 
86     // Register the MC codegen info.
87     TargetRegistry::RegisterMCCodeGenInfo(*T, createBPFMCCodeGenInfo);
88 
89     // Register the MC instruction info.
90     TargetRegistry::RegisterMCInstrInfo(*T, createBPFMCInstrInfo);
91 
92     // Register the MC register info.
93     TargetRegistry::RegisterMCRegInfo(*T, createBPFMCRegisterInfo);
94 
95     // Register the MC subtarget info.
96     TargetRegistry::RegisterMCSubtargetInfo(*T,
97                                             createBPFMCSubtargetInfo);
98 
99     // Register the object streamer
100     TargetRegistry::RegisterELFStreamer(*T, createBPFMCStreamer);
101 
102     // Register the MCInstPrinter.
103     TargetRegistry::RegisterMCInstPrinter(*T, createBPFMCInstPrinter);
104   }
105 
106   // Register the MC code emitter
107   TargetRegistry::RegisterMCCodeEmitter(TheBPFleTarget, createBPFMCCodeEmitter);
108   TargetRegistry::RegisterMCCodeEmitter(TheBPFbeTarget, createBPFbeMCCodeEmitter);
109 
110   // Register the ASM Backend
111   TargetRegistry::RegisterMCAsmBackend(TheBPFleTarget, createBPFAsmBackend);
112   TargetRegistry::RegisterMCAsmBackend(TheBPFbeTarget, createBPFbeAsmBackend);
113 
114   if (sys::IsLittleEndianHost) {
115     TargetRegistry::RegisterMCCodeEmitter(TheBPFTarget, createBPFMCCodeEmitter);
116     TargetRegistry::RegisterMCAsmBackend(TheBPFTarget, createBPFAsmBackend);
117   } else {
118     TargetRegistry::RegisterMCCodeEmitter(TheBPFTarget, createBPFbeMCCodeEmitter);
119     TargetRegistry::RegisterMCAsmBackend(TheBPFTarget, createBPFbeAsmBackend);
120   }
121 }
122