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 "llvm/BinaryFormat/ELF.h"
16 #include "llvm/MC/MCAssembler.h"
17 #include "llvm/MC/MCCodeEmitter.h"
18 #include "llvm/MC/MCObjectWriter.h"
19 
20 using namespace llvm;
21 
22 // This part is for ELF object output.
23 LoongArchTargetELFStreamer::LoongArchTargetELFStreamer(
24     MCStreamer &S, const MCSubtargetInfo &STI)
25     : LoongArchTargetStreamer(S) {
26   // FIXME: select appropriate ABI.
27   setTargetABI(STI.getTargetTriple().isArch64Bit() ? LoongArchABI::ABI_LP64D
28                                                    : LoongArchABI::ABI_ILP32D);
29 }
30 
31 MCELFStreamer &LoongArchTargetELFStreamer::getStreamer() {
32   return static_cast<MCELFStreamer &>(Streamer);
33 }
34 
35 void LoongArchTargetELFStreamer::finish() {
36   LoongArchTargetStreamer::finish();
37   MCAssembler &MCA = getStreamer().getAssembler();
38   LoongArchABI::ABI ABI = getTargetABI();
39 
40   // Figure out the e_flags.
41   //
42   // Bitness is already represented with the EI_CLASS byte in the current spec,
43   // so here we only record the base ABI modifier. Also set the object file ABI
44   // version to v1, as upstream LLVM cannot handle the previous stack-machine-
45   // based relocs from day one.
46   //
47   // Refer to LoongArch ELF psABI v2.01 for details.
48   unsigned EFlags = MCA.getELFHeaderEFlags();
49   EFlags |= ELF::EF_LOONGARCH_OBJABI_V1;
50   switch (ABI) {
51   case LoongArchABI::ABI_ILP32S:
52   case LoongArchABI::ABI_LP64S:
53     EFlags |= ELF::EF_LOONGARCH_ABI_SOFT_FLOAT;
54     break;
55   case LoongArchABI::ABI_ILP32F:
56   case LoongArchABI::ABI_LP64F:
57     EFlags |= ELF::EF_LOONGARCH_ABI_SINGLE_FLOAT;
58     break;
59   case LoongArchABI::ABI_ILP32D:
60   case LoongArchABI::ABI_LP64D:
61     EFlags |= ELF::EF_LOONGARCH_ABI_DOUBLE_FLOAT;
62     break;
63   case LoongArchABI::ABI_Unknown:
64     llvm_unreachable("Improperly initialized target ABI");
65   }
66   MCA.setELFHeaderEFlags(EFlags);
67 }
68 
69 namespace {
70 class LoongArchELFStreamer : public MCELFStreamer {
71 public:
72   LoongArchELFStreamer(MCContext &C, std::unique_ptr<MCAsmBackend> MAB,
73                        std::unique_ptr<MCObjectWriter> MOW,
74                        std::unique_ptr<MCCodeEmitter> MCE)
75       : MCELFStreamer(C, std::move(MAB), std::move(MOW), std::move(MCE)) {}
76 };
77 } // end namespace
78 
79 namespace llvm {
80 MCELFStreamer *createLoongArchELFStreamer(MCContext &C,
81                                           std::unique_ptr<MCAsmBackend> MAB,
82                                           std::unique_ptr<MCObjectWriter> MOW,
83                                           std::unique_ptr<MCCodeEmitter> MCE,
84                                           bool RelaxAll) {
85   LoongArchELFStreamer *S = new LoongArchELFStreamer(
86       C, std::move(MAB), std::move(MOW), std::move(MCE));
87   S->getAssembler().setRelaxAll(RelaxAll);
88   return S;
89 }
90 } // end namespace llvm
91