1 //===-- LoongArchELFStreamer.cpp - LoongArch ELF Target Streamer Methods --===//
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 // This file provides LoongArch specific target streamer methods.
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "LoongArchELFStreamer.h"
14 #include "LoongArchAsmBackend.h"
15 #include "LoongArchBaseInfo.h"
16 #include "llvm/BinaryFormat/ELF.h"
17 #include "llvm/MC/MCAssembler.h"
18 #include "llvm/MC/MCCodeEmitter.h"
19 #include "llvm/MC/MCObjectWriter.h"
20
21 using namespace llvm;
22
23 // This part is for ELF object output.
LoongArchTargetELFStreamer(MCStreamer & S,const MCSubtargetInfo & STI)24 LoongArchTargetELFStreamer::LoongArchTargetELFStreamer(
25 MCStreamer &S, const MCSubtargetInfo &STI)
26 : LoongArchTargetStreamer(S) {
27 auto &MAB = static_cast<LoongArchAsmBackend &>(
28 getStreamer().getAssembler().getBackend());
29 setTargetABI(LoongArchABI::computeTargetABI(
30 STI.getTargetTriple(), MAB.getTargetOptions().getABIName()));
31 }
32
getStreamer()33 MCELFStreamer &LoongArchTargetELFStreamer::getStreamer() {
34 return static_cast<MCELFStreamer &>(Streamer);
35 }
36
finish()37 void LoongArchTargetELFStreamer::finish() {
38 LoongArchTargetStreamer::finish();
39 MCAssembler &MCA = getStreamer().getAssembler();
40 LoongArchABI::ABI ABI = getTargetABI();
41
42 // Figure out the e_flags.
43 //
44 // Bitness is already represented with the EI_CLASS byte in the current spec,
45 // so here we only record the base ABI modifier. Also set the object file ABI
46 // version to v1, as upstream LLVM cannot handle the previous stack-machine-
47 // based relocs from day one.
48 //
49 // Refer to LoongArch ELF psABI v2.01 for details.
50 unsigned EFlags = MCA.getELFHeaderEFlags();
51 EFlags |= ELF::EF_LOONGARCH_OBJABI_V1;
52 switch (ABI) {
53 case LoongArchABI::ABI_ILP32S:
54 case LoongArchABI::ABI_LP64S:
55 EFlags |= ELF::EF_LOONGARCH_ABI_SOFT_FLOAT;
56 break;
57 case LoongArchABI::ABI_ILP32F:
58 case LoongArchABI::ABI_LP64F:
59 EFlags |= ELF::EF_LOONGARCH_ABI_SINGLE_FLOAT;
60 break;
61 case LoongArchABI::ABI_ILP32D:
62 case LoongArchABI::ABI_LP64D:
63 EFlags |= ELF::EF_LOONGARCH_ABI_DOUBLE_FLOAT;
64 break;
65 case LoongArchABI::ABI_Unknown:
66 llvm_unreachable("Improperly initialized target ABI");
67 }
68 MCA.setELFHeaderEFlags(EFlags);
69 }
70
71 namespace {
72 class LoongArchELFStreamer : public MCELFStreamer {
73 public:
LoongArchELFStreamer(MCContext & C,std::unique_ptr<MCAsmBackend> MAB,std::unique_ptr<MCObjectWriter> MOW,std::unique_ptr<MCCodeEmitter> MCE)74 LoongArchELFStreamer(MCContext &C, std::unique_ptr<MCAsmBackend> MAB,
75 std::unique_ptr<MCObjectWriter> MOW,
76 std::unique_ptr<MCCodeEmitter> MCE)
77 : MCELFStreamer(C, std::move(MAB), std::move(MOW), std::move(MCE)) {}
78 };
79 } // end namespace
80
81 namespace llvm {
createLoongArchELFStreamer(MCContext & C,std::unique_ptr<MCAsmBackend> MAB,std::unique_ptr<MCObjectWriter> MOW,std::unique_ptr<MCCodeEmitter> MCE,bool RelaxAll)82 MCELFStreamer *createLoongArchELFStreamer(MCContext &C,
83 std::unique_ptr<MCAsmBackend> MAB,
84 std::unique_ptr<MCObjectWriter> MOW,
85 std::unique_ptr<MCCodeEmitter> MCE,
86 bool RelaxAll) {
87 LoongArchELFStreamer *S = new LoongArchELFStreamer(
88 C, std::move(MAB), std::move(MOW), std::move(MCE));
89 S->getAssembler().setRelaxAll(RelaxAll);
90 return S;
91 }
92 } // end namespace llvm
93