1//===-- SparcELFObjectWriter.cpp - Sparc ELF Writer -----------------------===//
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#include "MCTargetDesc/SparcFixupKinds.h"
10#include "MCTargetDesc/SparcMCExpr.h"
11#include "MCTargetDesc/SparcMCTargetDesc.h"
12#include "llvm/ADT/STLExtras.h"
13#include "llvm/MC/MCELFObjectWriter.h"
14#include "llvm/MC/MCExpr.h"
15#include "llvm/MC/MCObjectWriter.h"
16#include "llvm/MC/MCValue.h"
17#include "llvm/Support/ErrorHandling.h"
18
19using namespace llvm;
20
21namespace {
22  class SparcELFObjectWriter : public MCELFObjectTargetWriter {
23  public:
24    SparcELFObjectWriter(bool Is64Bit, uint8_t OSABI)
25      : MCELFObjectTargetWriter(Is64Bit, OSABI,
26                                Is64Bit ?  ELF::EM_SPARCV9 : ELF::EM_SPARC,
27                                /*HasRelocationAddend*/ true) {}
28
29    ~SparcELFObjectWriter() override {}
30
31  protected:
32    unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
33                          const MCFixup &Fixup, bool IsPCRel) const override;
34
35    bool needsRelocateWithSymbol(const MCSymbol &Sym,
36                                 unsigned Type) const override;
37
38  };
39}
40
41unsigned SparcELFObjectWriter::getRelocType(MCContext &Ctx,
42                                            const MCValue &Target,
43                                            const MCFixup &Fixup,
44                                            bool IsPCRel) const {
45
46  if (const SparcMCExpr *SExpr = dyn_cast<SparcMCExpr>(Fixup.getValue())) {
47    if (SExpr->getKind() == SparcMCExpr::VK_Sparc_R_DISP32)
48      return ELF::R_SPARC_DISP32;
49  }
50
51  if (IsPCRel) {
52    switch(Fixup.getTargetKind()) {
53    default:
54      llvm_unreachable("Unimplemented fixup -> relocation");
55    case FK_Data_1:                  return ELF::R_SPARC_DISP8;
56    case FK_Data_2:                  return ELF::R_SPARC_DISP16;
57    case FK_Data_4:                  return ELF::R_SPARC_DISP32;
58    case FK_Data_8:                  return ELF::R_SPARC_DISP64;
59    case Sparc::fixup_sparc_call30:  return ELF::R_SPARC_WDISP30;
60    case Sparc::fixup_sparc_br22:    return ELF::R_SPARC_WDISP22;
61    case Sparc::fixup_sparc_br19:    return ELF::R_SPARC_WDISP19;
62    case Sparc::fixup_sparc_pc22:    return ELF::R_SPARC_PC22;
63    case Sparc::fixup_sparc_pc10:    return ELF::R_SPARC_PC10;
64    case Sparc::fixup_sparc_wplt30:  return ELF::R_SPARC_WPLT30;
65    }
66  }
67
68  switch(Fixup.getTargetKind()) {
69  default:
70    llvm_unreachable("Unimplemented fixup -> relocation");
71  case FK_Data_1:                return ELF::R_SPARC_8;
72  case FK_Data_2:                return ((Fixup.getOffset() % 2)
73                                         ? ELF::R_SPARC_UA16
74                                         : ELF::R_SPARC_16);
75  case FK_Data_4:                return ((Fixup.getOffset() % 4)
76                                         ? ELF::R_SPARC_UA32
77                                         : ELF::R_SPARC_32);
78  case FK_Data_8:                return ((Fixup.getOffset() % 8)
79                                         ? ELF::R_SPARC_UA64
80                                         : ELF::R_SPARC_64);
81  case Sparc::fixup_sparc_13:    return ELF::R_SPARC_13;
82  case Sparc::fixup_sparc_hi22:  return ELF::R_SPARC_HI22;
83  case Sparc::fixup_sparc_lo10:  return ELF::R_SPARC_LO10;
84  case Sparc::fixup_sparc_h44:   return ELF::R_SPARC_H44;
85  case Sparc::fixup_sparc_m44:   return ELF::R_SPARC_M44;
86  case Sparc::fixup_sparc_l44:   return ELF::R_SPARC_L44;
87  case Sparc::fixup_sparc_hh:    return ELF::R_SPARC_HH22;
88  case Sparc::fixup_sparc_hm:    return ELF::R_SPARC_HM10;
89  case Sparc::fixup_sparc_got22: return ELF::R_SPARC_GOT22;
90  case Sparc::fixup_sparc_got10: return ELF::R_SPARC_GOT10;
91  case Sparc::fixup_sparc_got13: return ELF::R_SPARC_GOT13;
92  case Sparc::fixup_sparc_tls_gd_hi22:   return ELF::R_SPARC_TLS_GD_HI22;
93  case Sparc::fixup_sparc_tls_gd_lo10:   return ELF::R_SPARC_TLS_GD_LO10;
94  case Sparc::fixup_sparc_tls_gd_add:    return ELF::R_SPARC_TLS_GD_ADD;
95  case Sparc::fixup_sparc_tls_gd_call:   return ELF::R_SPARC_TLS_GD_CALL;
96  case Sparc::fixup_sparc_tls_ldm_hi22:  return ELF::R_SPARC_TLS_LDM_HI22;
97  case Sparc::fixup_sparc_tls_ldm_lo10:  return ELF::R_SPARC_TLS_LDM_LO10;
98  case Sparc::fixup_sparc_tls_ldm_add:   return ELF::R_SPARC_TLS_LDM_ADD;
99  case Sparc::fixup_sparc_tls_ldm_call:  return ELF::R_SPARC_TLS_LDM_CALL;
100  case Sparc::fixup_sparc_tls_ldo_hix22: return ELF::R_SPARC_TLS_LDO_HIX22;
101  case Sparc::fixup_sparc_tls_ldo_lox10: return ELF::R_SPARC_TLS_LDO_LOX10;
102  case Sparc::fixup_sparc_tls_ldo_add:   return ELF::R_SPARC_TLS_LDO_ADD;
103  case Sparc::fixup_sparc_tls_ie_hi22:   return ELF::R_SPARC_TLS_IE_HI22;
104  case Sparc::fixup_sparc_tls_ie_lo10:   return ELF::R_SPARC_TLS_IE_LO10;
105  case Sparc::fixup_sparc_tls_ie_ld:     return ELF::R_SPARC_TLS_IE_LD;
106  case Sparc::fixup_sparc_tls_ie_ldx:    return ELF::R_SPARC_TLS_IE_LDX;
107  case Sparc::fixup_sparc_tls_ie_add:    return ELF::R_SPARC_TLS_IE_ADD;
108  case Sparc::fixup_sparc_tls_le_hix22:  return ELF::R_SPARC_TLS_LE_HIX22;
109  case Sparc::fixup_sparc_tls_le_lox10:  return ELF::R_SPARC_TLS_LE_LOX10;
110  }
111
112  return ELF::R_SPARC_NONE;
113}
114
115bool SparcELFObjectWriter::needsRelocateWithSymbol(const MCSymbol &Sym,
116                                                 unsigned Type) const {
117  switch (Type) {
118    default:
119      return false;
120
121    // All relocations that use a GOT need a symbol, not an offset, as
122    // the offset of the symbol within the section is irrelevant to
123    // where the GOT entry is. Don't need to list all the TLS entries,
124    // as they're all marked as requiring a symbol anyways.
125    case ELF::R_SPARC_GOT10:
126    case ELF::R_SPARC_GOT13:
127    case ELF::R_SPARC_GOT22:
128    case ELF::R_SPARC_GOTDATA_HIX22:
129    case ELF::R_SPARC_GOTDATA_LOX10:
130    case ELF::R_SPARC_GOTDATA_OP_HIX22:
131    case ELF::R_SPARC_GOTDATA_OP_LOX10:
132      return true;
133  }
134}
135
136std::unique_ptr<MCObjectTargetWriter>
137llvm::createSparcELFObjectWriter(bool Is64Bit, uint8_t OSABI) {
138  return std::make_unique<SparcELFObjectWriter>(Is64Bit, OSABI);
139}
140