1 //= AArch64WinCOFFObjectWriter.cpp - AArch64 Windows COFF Object Writer C++ =//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===---------------------------------------------------------------------===//
9 
10 #include "MCTargetDesc/AArch64FixupKinds.h"
11 #include "llvm/ADT/Twine.h"
12 #include "llvm/BinaryFormat/COFF.h"
13 #include "llvm/MC/MCAsmBackend.h"
14 #include "llvm/MC/MCExpr.h"
15 #include "llvm/MC/MCFixup.h"
16 #include "llvm/MC/MCFixupKindInfo.h"
17 #include "llvm/MC/MCValue.h"
18 #include "llvm/MC/MCWinCOFFObjectWriter.h"
19 #include "llvm/Support/ErrorHandling.h"
20 #include "llvm/Support/raw_ostream.h"
21 #include <cassert>
22 
23 using namespace llvm;
24 
25 namespace {
26 
27 class AArch64WinCOFFObjectWriter : public MCWinCOFFObjectTargetWriter {
28 public:
29   AArch64WinCOFFObjectWriter()
30       : MCWinCOFFObjectTargetWriter(COFF::IMAGE_FILE_MACHINE_ARM64) {}
31 
32   ~AArch64WinCOFFObjectWriter() override = default;
33 
34   unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
35                         const MCFixup &Fixup, bool IsCrossSection,
36                         const MCAsmBackend &MAB) const override;
37 
38   bool recordRelocation(const MCFixup &) const override;
39 };
40 
41 } // end anonymous namespace
42 
43 unsigned AArch64WinCOFFObjectWriter::getRelocType(
44     MCContext &Ctx, const MCValue &Target, const MCFixup &Fixup,
45     bool IsCrossSection, const MCAsmBackend &MAB) const {
46   auto Modifier = Target.isAbsolute() ? MCSymbolRefExpr::VK_None
47                                       : Target.getSymA()->getKind();
48 
49   switch (static_cast<unsigned>(Fixup.getKind())) {
50   default: {
51     const MCFixupKindInfo &Info = MAB.getFixupKindInfo(Fixup.getKind());
52     report_fatal_error(Twine("unsupported relocation type: ") + Info.Name);
53   }
54 
55   case FK_Data_4:
56     switch (Modifier) {
57     default:
58       return COFF::IMAGE_REL_ARM64_ADDR32;
59     case MCSymbolRefExpr::VK_COFF_IMGREL32:
60       return COFF::IMAGE_REL_ARM64_ADDR32NB;
61     case MCSymbolRefExpr::VK_SECREL:
62       return COFF::IMAGE_REL_ARM64_SECREL;
63     }
64 
65   case FK_Data_8:
66     return COFF::IMAGE_REL_ARM64_ADDR64;
67 
68   case FK_SecRel_2:
69     return COFF::IMAGE_REL_ARM64_SECTION;
70 
71   case FK_SecRel_4:
72     return COFF::IMAGE_REL_ARM64_SECREL;
73 
74   case AArch64::fixup_aarch64_add_imm12:
75     return COFF::IMAGE_REL_ARM64_PAGEOFFSET_12A;
76 
77   case AArch64::fixup_aarch64_ldst_imm12_scale1:
78   case AArch64::fixup_aarch64_ldst_imm12_scale2:
79   case AArch64::fixup_aarch64_ldst_imm12_scale4:
80   case AArch64::fixup_aarch64_ldst_imm12_scale8:
81   case AArch64::fixup_aarch64_ldst_imm12_scale16:
82     return COFF::IMAGE_REL_ARM64_PAGEOFFSET_12L;
83 
84   case AArch64::fixup_aarch64_pcrel_adrp_imm21:
85     return COFF::IMAGE_REL_ARM64_PAGEBASE_REL21;
86 
87   case AArch64::fixup_aarch64_pcrel_branch26:
88   case AArch64::fixup_aarch64_pcrel_call26:
89     return COFF::IMAGE_REL_ARM64_BRANCH26;
90   }
91 }
92 
93 bool AArch64WinCOFFObjectWriter::recordRelocation(const MCFixup &Fixup) const {
94   return true;
95 }
96 
97 namespace llvm {
98 
99 MCObjectWriter *createAArch64WinCOFFObjectWriter(raw_pwrite_stream &OS) {
100   MCWinCOFFObjectTargetWriter *MOTW = new AArch64WinCOFFObjectWriter();
101   return createWinCOFFObjectWriter(MOTW, OS);
102 }
103 
104 } // end namespace llvm
105