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
19 using namespace llvm;
20
21 namespace {
22 class SparcELFObjectWriter : public MCELFObjectTargetWriter {
23 public:
SparcELFObjectWriter(bool Is64Bit,uint8_t OSABI)24 SparcELFObjectWriter(bool Is64Bit, uint8_t OSABI)
25 : MCELFObjectTargetWriter(Is64Bit, OSABI,
26 Is64Bit ? ELF::EM_SPARCV9 : ELF::EM_SPARC,
27 /*HasRelocationAddend*/ true) {}
28
~SparcELFObjectWriter()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
GetRelocType(const MCValue & Target,const MCFixup & Fixup,bool IsPCRel) const41 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
needsRelocateWithSymbol(const MCSymbol & Sym,unsigned Type) const112 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
createSparcELFObjectWriter(raw_pwrite_stream & OS,bool Is64Bit,bool IsLittleEndian,uint8_t OSABI)133 MCObjectWriter *llvm::createSparcELFObjectWriter(raw_pwrite_stream &OS,
134 bool Is64Bit,
135 bool IsLittleEndian,
136 uint8_t OSABI) {
137 MCELFObjectTargetWriter *MOTW = new SparcELFObjectWriter(Is64Bit, OSABI);
138 return createELFObjectWriter(MOTW, OS, IsLittleEndian);
139 }
140