LLVM  3.7.0
SparcELFObjectWriter.cpp
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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 
13 #include "llvm/ADT/STLExtras.h"
15 #include "llvm/MC/MCExpr.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(const MCValue &Target, const MCFixup &Fixup,
33  bool IsPCRel) const override;
34 
35  bool needsRelocateWithSymbol(const MCSymbol &Sym,
36  unsigned Type) const override;
37 
38  };
39 }
40 
41 unsigned SparcELFObjectWriter::GetRelocType(const MCValue &Target,
42  const MCFixup &Fixup,
43  bool IsPCRel) const {
44 
45  if (const SparcMCExpr *SExpr = dyn_cast<SparcMCExpr>(Fixup.getValue())) {
46  if (SExpr->getKind() == SparcMCExpr::VK_Sparc_R_DISP32)
47  return ELF::R_SPARC_DISP32;
48  }
49 
50  if (IsPCRel) {
51  switch((unsigned)Fixup.getKind()) {
52  default:
53  llvm_unreachable("Unimplemented fixup -> relocation");
54  case FK_Data_1: return ELF::R_SPARC_DISP8;
55  case FK_Data_2: return ELF::R_SPARC_DISP16;
56  case FK_Data_4: return ELF::R_SPARC_DISP32;
57  case FK_Data_8: return ELF::R_SPARC_DISP64;
58  case Sparc::fixup_sparc_call30: return ELF::R_SPARC_WDISP30;
59  case Sparc::fixup_sparc_br22: return ELF::R_SPARC_WDISP22;
60  case Sparc::fixup_sparc_br19: return ELF::R_SPARC_WDISP19;
61  case Sparc::fixup_sparc_pc22: return ELF::R_SPARC_PC22;
62  case Sparc::fixup_sparc_pc10: return ELF::R_SPARC_PC10;
63  case Sparc::fixup_sparc_wplt30: return ELF::R_SPARC_WPLT30;
64  }
65  }
66 
67  switch((unsigned)Fixup.getKind()) {
68  default:
69  llvm_unreachable("Unimplemented fixup -> relocation");
70  case FK_Data_1: return ELF::R_SPARC_8;
71  case FK_Data_2: return ((Fixup.getOffset() % 2)
72  ? ELF::R_SPARC_UA16
73  : ELF::R_SPARC_16);
74  case FK_Data_4: return ((Fixup.getOffset() % 4)
75  ? ELF::R_SPARC_UA32
76  : ELF::R_SPARC_32);
77  case FK_Data_8: return ((Fixup.getOffset() % 8)
78  ? ELF::R_SPARC_UA64
79  : ELF::R_SPARC_64);
80  case Sparc::fixup_sparc_hi22: return ELF::R_SPARC_HI22;
81  case Sparc::fixup_sparc_lo10: return ELF::R_SPARC_LO10;
82  case Sparc::fixup_sparc_h44: return ELF::R_SPARC_H44;
83  case Sparc::fixup_sparc_m44: return ELF::R_SPARC_M44;
84  case Sparc::fixup_sparc_l44: return ELF::R_SPARC_L44;
85  case Sparc::fixup_sparc_hh: return ELF::R_SPARC_HH22;
86  case Sparc::fixup_sparc_hm: return ELF::R_SPARC_HM10;
87  case Sparc::fixup_sparc_got22: return ELF::R_SPARC_GOT22;
88  case Sparc::fixup_sparc_got10: return ELF::R_SPARC_GOT10;
89  case Sparc::fixup_sparc_tls_gd_hi22: return ELF::R_SPARC_TLS_GD_HI22;
90  case Sparc::fixup_sparc_tls_gd_lo10: return ELF::R_SPARC_TLS_GD_LO10;
91  case Sparc::fixup_sparc_tls_gd_add: return ELF::R_SPARC_TLS_GD_ADD;
92  case Sparc::fixup_sparc_tls_gd_call: return ELF::R_SPARC_TLS_GD_CALL;
93  case Sparc::fixup_sparc_tls_ldm_hi22: return ELF::R_SPARC_TLS_LDM_HI22;
94  case Sparc::fixup_sparc_tls_ldm_lo10: return ELF::R_SPARC_TLS_LDM_LO10;
95  case Sparc::fixup_sparc_tls_ldm_add: return ELF::R_SPARC_TLS_LDM_ADD;
96  case Sparc::fixup_sparc_tls_ldm_call: return ELF::R_SPARC_TLS_LDM_CALL;
97  case Sparc::fixup_sparc_tls_ldo_hix22: return ELF::R_SPARC_TLS_LDO_HIX22;
98  case Sparc::fixup_sparc_tls_ldo_lox10: return ELF::R_SPARC_TLS_LDO_LOX10;
99  case Sparc::fixup_sparc_tls_ldo_add: return ELF::R_SPARC_TLS_LDO_ADD;
100  case Sparc::fixup_sparc_tls_ie_hi22: return ELF::R_SPARC_TLS_IE_HI22;
101  case Sparc::fixup_sparc_tls_ie_lo10: return ELF::R_SPARC_TLS_IE_LO10;
102  case Sparc::fixup_sparc_tls_ie_ld: return ELF::R_SPARC_TLS_IE_LD;
103  case Sparc::fixup_sparc_tls_ie_ldx: return ELF::R_SPARC_TLS_IE_LDX;
104  case Sparc::fixup_sparc_tls_ie_add: return ELF::R_SPARC_TLS_IE_ADD;
105  case Sparc::fixup_sparc_tls_le_hix22: return ELF::R_SPARC_TLS_LE_HIX22;
106  case Sparc::fixup_sparc_tls_le_lox10: return ELF::R_SPARC_TLS_LE_LOX10;
107  }
108 
109  return ELF::R_SPARC_NONE;
110 }
111 
112 bool SparcELFObjectWriter::needsRelocateWithSymbol(const MCSymbol &Sym,
113  unsigned Type) const {
114  switch (Type) {
115  default:
116  return false;
117 
118  // All relocations that use a GOT need a symbol, not an offset, as
119  // the offset of the symbol within the section is irrelevant to
120  // where the GOT entry is. Don't need to list all the TLS entries,
121  // as they're all marked as requiring a symbol anyways.
122  case ELF::R_SPARC_GOT10:
123  case ELF::R_SPARC_GOT13:
124  case ELF::R_SPARC_GOT22:
125  case ELF::R_SPARC_GOTDATA_HIX22:
126  case ELF::R_SPARC_GOTDATA_LOX10:
127  case ELF::R_SPARC_GOTDATA_OP_HIX22:
128  case ELF::R_SPARC_GOTDATA_OP_LOX10:
129  return true;
130  }
131 }
132 
134  bool Is64Bit,
135  bool IsLittleEndian,
136  uint8_t OSABI) {
137  MCELFObjectTargetWriter *MOTW = new SparcELFObjectWriter(Is64Bit, OSABI);
138  return createELFObjectWriter(MOTW, OS, IsLittleEndian);
139 }
fixup_sparc_got22 - 22-bit fixup corresponding to got22(foo)
This represents an "assembler immediate".
Definition: MCValue.h:44
MCSymbol - Instances of this class represent a symbol name in the MC file, and MCSymbols are created ...
Definition: MCSymbol.h:39
fixup_sparc_m44 - 10-bit fixup corresponding to m44(foo)
Defines the object file and target independent interfaces used by the assembler backend to write nati...
MCObjectWriter * createSparcELFObjectWriter(raw_pwrite_stream &OS, bool Is64Bit, bool IsLIttleEndian, uint8_t OSABI)
Encode information on a single operation to perform on a byte sequence (e.g., an encoded instruction)...
Definition: MCFixup.h:62
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
Definition: ErrorHandling.h:98
fixup_sparc_got10 - 10-bit fixup corresponding to got10(foo)
A four-byte fixup.
Definition: MCFixup.h:26
fixup_sparc_hm - 10-bit fixup corresponding to hm(foo)
uint32_t getOffset() const
Definition: MCFixup.h:91
fixup_sparc_br19 - 19-bit PC relative relocation for branches on icc/xcc
#define true
Definition: ConvertUTF.c:66
const MCExpr * getValue() const
Definition: MCFixup.h:94
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)
fixup_sparc_l44 - 12-bit fixup corresponding to l44(foo)
MCFixupKind getKind() const
Definition: MCFixup.h:89
A one-byte fixup.
Definition: MCFixup.h:24
PowerPC TLS Dynamic Call Fixup
fixup_sparc_lo10 - 10-bit fixup corresponding to lo(foo)
Target - Wrapper for Target specific information.
fixup_sparc_pc22 - 22-bit fixup corresponding to pc22(foo)
MCObjectWriter * createELFObjectWriter(MCELFObjectTargetWriter *MOTW, raw_pwrite_stream &OS, bool IsLittleEndian)
Construct a new ELF writer instance.
A eight-byte fixup.
Definition: MCFixup.h:27
An abstract base class for streams implementations that also support a pwrite operation.
Definition: raw_ostream.h:321
fixup_sparc_br22 - 22-bit PC relative relocation for branches
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)
fixup_sparc_pc10 - 10-bit fixup corresponding to pc10(foo)