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
21using namespace llvm;
22
23// This part is for ELF object output.
24LoongArchTargetELFStreamer::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 TT: STI.getTargetTriple(), FeatureBits: STI.getFeatureBits(),
31 ABIName: MAB.getTargetOptions().getABIName()));
32}
33
34MCELFStreamer &LoongArchTargetELFStreamer::getStreamer() {
35 return static_cast<MCELFStreamer &>(Streamer);
36}
37
38void LoongArchTargetELFStreamer::finish() {
39 LoongArchTargetStreamer::finish();
40 ELFObjectWriter &W = getStreamer().getWriter();
41 LoongArchABI::ABI ABI = getTargetABI();
42
43 // Figure out the e_flags.
44 //
45 // Bitness is already represented with the EI_CLASS byte in the current spec,
46 // so here we only record the base ABI modifier. Also set the object file ABI
47 // version to v1, as upstream LLVM cannot handle the previous stack-machine-
48 // based relocs from day one.
49 //
50 // Refer to LoongArch ELF psABI v2.01 for details.
51 unsigned EFlags = W.getELFHeaderEFlags();
52 EFlags |= ELF::EF_LOONGARCH_OBJABI_V1;
53 switch (ABI) {
54 case LoongArchABI::ABI_ILP32S:
55 case LoongArchABI::ABI_LP64S:
56 EFlags |= ELF::EF_LOONGARCH_ABI_SOFT_FLOAT;
57 break;
58 case LoongArchABI::ABI_ILP32F:
59 case LoongArchABI::ABI_LP64F:
60 EFlags |= ELF::EF_LOONGARCH_ABI_SINGLE_FLOAT;
61 break;
62 case LoongArchABI::ABI_ILP32D:
63 case LoongArchABI::ABI_LP64D:
64 EFlags |= ELF::EF_LOONGARCH_ABI_DOUBLE_FLOAT;
65 break;
66 case LoongArchABI::ABI_Unknown:
67 llvm_unreachable("Improperly initialized target ABI");
68 }
69 W.setELFHeaderEFlags(EFlags);
70}
71
72namespace {
73class LoongArchELFStreamer : public MCELFStreamer {
74public:
75 LoongArchELFStreamer(MCContext &C, std::unique_ptr<MCAsmBackend> MAB,
76 std::unique_ptr<MCObjectWriter> MOW,
77 std::unique_ptr<MCCodeEmitter> MCE)
78 : MCELFStreamer(C, std::move(MAB), std::move(MOW), std::move(MCE)) {}
79};
80} // end namespace
81
82namespace llvm {
83MCELFStreamer *createLoongArchELFStreamer(MCContext &C,
84 std::unique_ptr<MCAsmBackend> MAB,
85 std::unique_ptr<MCObjectWriter> MOW,
86 std::unique_ptr<MCCodeEmitter> MCE) {
87 LoongArchELFStreamer *S = new LoongArchELFStreamer(
88 C, std::move(MAB), std::move(MOW), std::move(MCE));
89 return S;
90}
91} // end namespace llvm
92