LLVM  10.0.0svn
SparcELFObjectWriter.cpp
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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 
12 #include "llvm/ADT/STLExtras.h"
14 #include "llvm/MC/MCExpr.h"
15 #include "llvm/MC/MCObjectWriter.h"
16 #include "llvm/MC/MCValue.h"
18 
19 using namespace llvm;
20 
21 namespace {
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 
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_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 
115 bool 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 
136 std::unique_ptr<MCObjectTargetWriter>
137 llvm::createSparcELFObjectWriter(bool Is64Bit, uint8_t OSABI) {
138  return llvm::make_unique<SparcELFObjectWriter>(Is64Bit, OSABI);
139 }
fixup_sparc_got22 - 22-bit fixup corresponding to got22(foo)
fixup_sparc_13 - 13-bit fixup
This class represents lattice values for constants.
Definition: AllocatorList.h:23
This represents an "assembler immediate".
Definition: MCValue.h:39
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:41
block Block Frequency true
fixup_sparc_m44 - 10-bit fixup corresponding to m44(foo)
Encode information on a single operation to perform on a byte sequence (e.g., an encoded instruction)...
Definition: MCFixup.h:77
fixup_sparc_got10 - 10-bit fixup corresponding to got10(foo)
static unsigned getRelocType(const MCValue &Target, const MCFixupKind FixupKind, const bool IsPCRel)
Translates generic PPC fixup kind to Mach-O/PPC relocation type enum.
A four-byte fixup.
Definition: MCFixup.h:26
Context object for machine code objects.
Definition: MCContext.h:64
std::unique_ptr< MCObjectTargetWriter > createSparcELFObjectWriter(bool Is64Bit, uint8_t OSABI)
fixup_sparc_hm - 10-bit fixup corresponding to hm(foo)
fixup_sparc_br19 - 19-bit PC relative relocation for branches on icc/xcc
The instances of the Type class are immutable: once they are created, they are never changed...
Definition: Type.h:45
fixup_sparc_hh - 22-bit fixup corresponding to hh(foo)
uint32_t getOffset() const
Definition: MCFixup.h:128
fixup_sparc_l44 - 12-bit fixup corresponding to l44(foo)
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
A one-byte fixup.
Definition: MCFixup.h:24
fixup_sparc_lo10 - 10-bit fixup corresponding to lo(foo)
fixup_sparc_got13 - 13-bit fixup corresponding to got13(foo)
Target - Wrapper for Target specific information.
fixup_sparc_pc22 - 22-bit fixup corresponding to pc22(foo)
A eight-byte fixup.
Definition: MCFixup.h:27
fixup_sparc_br22 - 22-bit PC relative relocation for branches
const MCExpr * getValue() const
Definition: MCFixup.h:131
fixups for Thread Local Storage
fixup_sparc_hi22 - 22-bit fixup corresponding to hi(foo) for sethi
A two-byte fixup.
Definition: MCFixup.h:25
fixup_sparc_h44 - 22-bit fixup corresponding to h44(foo)
MCFixupKind getKind() const
Definition: MCFixup.h:126
fixup_sparc_pc10 - 10-bit fixup corresponding to pc10(foo)