1//===-- SparcELFObjectWriter.cpp - Sparc ELF Writer -----------------------===//
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/SparcFixupKinds.h"
11#include "MCTargetDesc/SparcMCExpr.h"
12#include "MCTargetDesc/SparcMCTargetDesc.h"
13#include "llvm/ADT/STLExtras.h"
14#include "llvm/MC/MCELFObjectWriter.h"
15#include "llvm/MC/MCExpr.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((unsigned)Fixup.getKind()) {
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((unsigned)Fixup.getKind()) {
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_hi22:  return ELF::R_SPARC_HI22;
82  case Sparc::fixup_sparc_lo10:  return ELF::R_SPARC_LO10;
83  case Sparc::fixup_sparc_h44:   return ELF::R_SPARC_H44;
84  case Sparc::fixup_sparc_m44:   return ELF::R_SPARC_M44;
85  case Sparc::fixup_sparc_l44:   return ELF::R_SPARC_L44;
86  case Sparc::fixup_sparc_hh:    return ELF::R_SPARC_HH22;
87  case Sparc::fixup_sparc_hm:    return ELF::R_SPARC_HM10;
88  case Sparc::fixup_sparc_got22: return ELF::R_SPARC_GOT22;
89  case Sparc::fixup_sparc_got10: return ELF::R_SPARC_GOT10;
90  case Sparc::fixup_sparc_tls_gd_hi22:   return ELF::R_SPARC_TLS_GD_HI22;
91  case Sparc::fixup_sparc_tls_gd_lo10:   return ELF::R_SPARC_TLS_GD_LO10;
92  case Sparc::fixup_sparc_tls_gd_add:    return ELF::R_SPARC_TLS_GD_ADD;
93  case Sparc::fixup_sparc_tls_gd_call:   return ELF::R_SPARC_TLS_GD_CALL;
94  case Sparc::fixup_sparc_tls_ldm_hi22:  return ELF::R_SPARC_TLS_LDM_HI22;
95  case Sparc::fixup_sparc_tls_ldm_lo10:  return ELF::R_SPARC_TLS_LDM_LO10;
96  case Sparc::fixup_sparc_tls_ldm_add:   return ELF::R_SPARC_TLS_LDM_ADD;
97  case Sparc::fixup_sparc_tls_ldm_call:  return ELF::R_SPARC_TLS_LDM_CALL;
98  case Sparc::fixup_sparc_tls_ldo_hix22: return ELF::R_SPARC_TLS_LDO_HIX22;
99  case Sparc::fixup_sparc_tls_ldo_lox10: return ELF::R_SPARC_TLS_LDO_LOX10;
100  case Sparc::fixup_sparc_tls_ldo_add:   return ELF::R_SPARC_TLS_LDO_ADD;
101  case Sparc::fixup_sparc_tls_ie_hi22:   return ELF::R_SPARC_TLS_IE_HI22;
102  case Sparc::fixup_sparc_tls_ie_lo10:   return ELF::R_SPARC_TLS_IE_LO10;
103  case Sparc::fixup_sparc_tls_ie_ld:     return ELF::R_SPARC_TLS_IE_LD;
104  case Sparc::fixup_sparc_tls_ie_ldx:    return ELF::R_SPARC_TLS_IE_LDX;
105  case Sparc::fixup_sparc_tls_ie_add:    return ELF::R_SPARC_TLS_IE_ADD;
106  case Sparc::fixup_sparc_tls_le_hix22:  return ELF::R_SPARC_TLS_LE_HIX22;
107  case Sparc::fixup_sparc_tls_le_lox10:  return ELF::R_SPARC_TLS_LE_LOX10;
108  }
109
110  return ELF::R_SPARC_NONE;
111}
112
113bool SparcELFObjectWriter::needsRelocateWithSymbol(const MCSymbol &Sym,
114                                                 unsigned Type) const {
115  switch (Type) {
116    default:
117      return false;
118
119    // All relocations that use a GOT need a symbol, not an offset, as
120    // the offset of the symbol within the section is irrelevant to
121    // where the GOT entry is. Don't need to list all the TLS entries,
122    // as they're all marked as requiring a symbol anyways.
123    case ELF::R_SPARC_GOT10:
124    case ELF::R_SPARC_GOT13:
125    case ELF::R_SPARC_GOT22:
126    case ELF::R_SPARC_GOTDATA_HIX22:
127    case ELF::R_SPARC_GOTDATA_LOX10:
128    case ELF::R_SPARC_GOTDATA_OP_HIX22:
129    case ELF::R_SPARC_GOTDATA_OP_LOX10:
130      return true;
131  }
132}
133
134MCObjectWriter *llvm::createSparcELFObjectWriter(raw_pwrite_stream &OS,
135                                                 bool Is64Bit,
136                                                 bool IsLittleEndian,
137                                                 uint8_t OSABI) {
138  MCELFObjectTargetWriter *MOTW = new SparcELFObjectWriter(Is64Bit, OSABI);
139  return createELFObjectWriter(MOTW, OS, IsLittleEndian);
140}
141