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.
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 
33 MCELFStreamer &LoongArchTargetELFStreamer::getStreamer() {
34   return static_cast<MCELFStreamer &>(Streamer);
35 }
36 
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:
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 {
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