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/MCELFObjectWriter.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::emitDirectiveOptionPush() {}
39void LoongArchTargetELFStreamer::emitDirectiveOptionPop() {}
40void LoongArchTargetELFStreamer::emitDirectiveOptionRelax() {}
41void LoongArchTargetELFStreamer::emitDirectiveOptionNoRelax() {}
42
43void LoongArchTargetELFStreamer::emitDTPRel32Value(const MCExpr *Value) {
44 auto &S = getStreamer();
45 S.ensureHeadroom(Headroom: 4);
46 S.addFixup(Value, Kind: LoongArch::fixup_loongarch_dtprel32);
47 S.appendContents(Num: 4, Elt: 0);
48}
49
50void LoongArchTargetELFStreamer::emitDTPRel64Value(const MCExpr *Value) {
51 auto &S = getStreamer();
52 S.ensureHeadroom(Headroom: 8);
53 S.addFixup(Value, Kind: LoongArch::fixup_loongarch_dtprel64);
54 S.appendContents(Num: 8, Elt: 0);
55}
56
57void LoongArchTargetELFStreamer::finish() {
58 LoongArchTargetStreamer::finish();
59 ELFObjectWriter &W = getStreamer().getWriter();
60 LoongArchABI::ABI ABI = getTargetABI();
61
62 // Figure out the e_flags.
63 //
64 // Bitness is already represented with the EI_CLASS byte in the current spec,
65 // so here we only record the base ABI modifier. Also set the object file ABI
66 // version to v1, as upstream LLVM cannot handle the previous stack-machine-
67 // based relocs from day one.
68 //
69 // Refer to LoongArch ELF psABI v2.01 for details.
70 unsigned EFlags = W.getELFHeaderEFlags();
71 EFlags |= ELF::EF_LOONGARCH_OBJABI_V1;
72 switch (ABI) {
73 case LoongArchABI::ABI_ILP32S:
74 case LoongArchABI::ABI_LP64S:
75 EFlags |= ELF::EF_LOONGARCH_ABI_SOFT_FLOAT;
76 break;
77 case LoongArchABI::ABI_ILP32F:
78 case LoongArchABI::ABI_LP64F:
79 EFlags |= ELF::EF_LOONGARCH_ABI_SINGLE_FLOAT;
80 break;
81 case LoongArchABI::ABI_ILP32D:
82 case LoongArchABI::ABI_LP64D:
83 EFlags |= ELF::EF_LOONGARCH_ABI_DOUBLE_FLOAT;
84 break;
85 case LoongArchABI::ABI_Unknown:
86 llvm_unreachable("Improperly initialized target ABI");
87 }
88 W.setELFHeaderEFlags(EFlags);
89}
90
91namespace {
92class LoongArchELFStreamer : public MCELFStreamer {
93public:
94 LoongArchELFStreamer(MCContext &C, std::unique_ptr<MCAsmBackend> MAB,
95 std::unique_ptr<MCObjectWriter> MOW,
96 std::unique_ptr<MCCodeEmitter> MCE)
97 : MCELFStreamer(C, std::move(MAB), std::move(MOW), std::move(MCE)) {}
98};
99} // end namespace
100
101namespace llvm {
102MCELFStreamer *createLoongArchELFStreamer(MCContext &C,
103 std::unique_ptr<MCAsmBackend> MAB,
104 std::unique_ptr<MCObjectWriter> MOW,
105 std::unique_ptr<MCCodeEmitter> MCE) {
106 LoongArchELFStreamer *S = new LoongArchELFStreamer(
107 C, std::move(MAB), std::move(MOW), std::move(MCE));
108 return S;
109}
110} // end namespace llvm
111