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
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
29 ~SparcELFObjectWriter() override = default;
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
getRelocType(MCContext & Ctx,const MCValue & Target,const MCFixup & Fixup,bool IsPCRel) const41 unsigned SparcELFObjectWriter::getRelocType(MCContext &Ctx,
42 const MCValue &Target,
43 const MCFixup &Fixup,
44 bool IsPCRel) const {
45 MCFixupKind Kind = Fixup.getKind();
46 if (Kind >= FirstLiteralRelocationKind)
47 return Kind - FirstLiteralRelocationKind;
48
49 if (const SparcMCExpr *SExpr = dyn_cast<SparcMCExpr>(Fixup.getValue())) {
50 if (SExpr->getKind() == SparcMCExpr::VK_Sparc_R_DISP32)
51 return ELF::R_SPARC_DISP32;
52 }
53
54 if (IsPCRel) {
55 switch(Fixup.getTargetKind()) {
56 default:
57 llvm_unreachable("Unimplemented fixup -> relocation");
58 case FK_Data_1: return ELF::R_SPARC_DISP8;
59 case FK_Data_2: return ELF::R_SPARC_DISP16;
60 case FK_Data_4: return ELF::R_SPARC_DISP32;
61 case FK_Data_8: return ELF::R_SPARC_DISP64;
62 case Sparc::fixup_sparc_call30: return ELF::R_SPARC_WDISP30;
63 case Sparc::fixup_sparc_br22: return ELF::R_SPARC_WDISP22;
64 case Sparc::fixup_sparc_br19: return ELF::R_SPARC_WDISP19;
65 case Sparc::fixup_sparc_pc22: return ELF::R_SPARC_PC22;
66 case Sparc::fixup_sparc_pc10: return ELF::R_SPARC_PC10;
67 case Sparc::fixup_sparc_wplt30: return ELF::R_SPARC_WPLT30;
68 }
69 }
70
71 switch(Fixup.getTargetKind()) {
72 default:
73 llvm_unreachable("Unimplemented fixup -> relocation");
74 case FK_NONE: return ELF::R_SPARC_NONE;
75 case FK_Data_1: return ELF::R_SPARC_8;
76 case FK_Data_2: return ((Fixup.getOffset() % 2)
77 ? ELF::R_SPARC_UA16
78 : ELF::R_SPARC_16);
79 case FK_Data_4: return ((Fixup.getOffset() % 4)
80 ? ELF::R_SPARC_UA32
81 : ELF::R_SPARC_32);
82 case FK_Data_8: return ((Fixup.getOffset() % 8)
83 ? ELF::R_SPARC_UA64
84 : ELF::R_SPARC_64);
85 case Sparc::fixup_sparc_13: return ELF::R_SPARC_13;
86 case Sparc::fixup_sparc_hi22: return ELF::R_SPARC_HI22;
87 case Sparc::fixup_sparc_lo10: return ELF::R_SPARC_LO10;
88 case Sparc::fixup_sparc_h44: return ELF::R_SPARC_H44;
89 case Sparc::fixup_sparc_m44: return ELF::R_SPARC_M44;
90 case Sparc::fixup_sparc_l44: return ELF::R_SPARC_L44;
91 case Sparc::fixup_sparc_hh: return ELF::R_SPARC_HH22;
92 case Sparc::fixup_sparc_hm: return ELF::R_SPARC_HM10;
93 case Sparc::fixup_sparc_lm: return ELF::R_SPARC_LM22;
94 case Sparc::fixup_sparc_got22: return ELF::R_SPARC_GOT22;
95 case Sparc::fixup_sparc_got10: return ELF::R_SPARC_GOT10;
96 case Sparc::fixup_sparc_got13: return ELF::R_SPARC_GOT13;
97 case Sparc::fixup_sparc_tls_gd_hi22: return ELF::R_SPARC_TLS_GD_HI22;
98 case Sparc::fixup_sparc_tls_gd_lo10: return ELF::R_SPARC_TLS_GD_LO10;
99 case Sparc::fixup_sparc_tls_gd_add: return ELF::R_SPARC_TLS_GD_ADD;
100 case Sparc::fixup_sparc_tls_gd_call: return ELF::R_SPARC_TLS_GD_CALL;
101 case Sparc::fixup_sparc_tls_ldm_hi22: return ELF::R_SPARC_TLS_LDM_HI22;
102 case Sparc::fixup_sparc_tls_ldm_lo10: return ELF::R_SPARC_TLS_LDM_LO10;
103 case Sparc::fixup_sparc_tls_ldm_add: return ELF::R_SPARC_TLS_LDM_ADD;
104 case Sparc::fixup_sparc_tls_ldm_call: return ELF::R_SPARC_TLS_LDM_CALL;
105 case Sparc::fixup_sparc_tls_ldo_hix22: return ELF::R_SPARC_TLS_LDO_HIX22;
106 case Sparc::fixup_sparc_tls_ldo_lox10: return ELF::R_SPARC_TLS_LDO_LOX10;
107 case Sparc::fixup_sparc_tls_ldo_add: return ELF::R_SPARC_TLS_LDO_ADD;
108 case Sparc::fixup_sparc_tls_ie_hi22: return ELF::R_SPARC_TLS_IE_HI22;
109 case Sparc::fixup_sparc_tls_ie_lo10: return ELF::R_SPARC_TLS_IE_LO10;
110 case Sparc::fixup_sparc_tls_ie_ld: return ELF::R_SPARC_TLS_IE_LD;
111 case Sparc::fixup_sparc_tls_ie_ldx: return ELF::R_SPARC_TLS_IE_LDX;
112 case Sparc::fixup_sparc_tls_ie_add: return ELF::R_SPARC_TLS_IE_ADD;
113 case Sparc::fixup_sparc_tls_le_hix22: return ELF::R_SPARC_TLS_LE_HIX22;
114 case Sparc::fixup_sparc_tls_le_lox10: return ELF::R_SPARC_TLS_LE_LOX10;
115 case Sparc::fixup_sparc_hix22: return ELF::R_SPARC_HIX22;
116 case Sparc::fixup_sparc_lox10: return ELF::R_SPARC_LOX10;
117 case Sparc::fixup_sparc_gotdata_hix22: return ELF::R_SPARC_GOTDATA_HIX22;
118 case Sparc::fixup_sparc_gotdata_lox10: return ELF::R_SPARC_GOTDATA_LOX10;
119 case Sparc::fixup_sparc_gotdata_op: return ELF::R_SPARC_GOTDATA_OP;
120 }
121
122 return ELF::R_SPARC_NONE;
123 }
124
needsRelocateWithSymbol(const MCSymbol & Sym,unsigned Type) const125 bool SparcELFObjectWriter::needsRelocateWithSymbol(const MCSymbol &Sym,
126 unsigned Type) const {
127 switch (Type) {
128 default:
129 return false;
130
131 // All relocations that use a GOT need a symbol, not an offset, as
132 // the offset of the symbol within the section is irrelevant to
133 // where the GOT entry is. Don't need to list all the TLS entries,
134 // as they're all marked as requiring a symbol anyways.
135 case ELF::R_SPARC_GOT10:
136 case ELF::R_SPARC_GOT13:
137 case ELF::R_SPARC_GOT22:
138 case ELF::R_SPARC_GOTDATA_HIX22:
139 case ELF::R_SPARC_GOTDATA_LOX10:
140 case ELF::R_SPARC_GOTDATA_OP_HIX22:
141 case ELF::R_SPARC_GOTDATA_OP_LOX10:
142 return true;
143 }
144 }
145
146 std::unique_ptr<MCObjectTargetWriter>
createSparcELFObjectWriter(bool Is64Bit,uint8_t OSABI)147 llvm::createSparcELFObjectWriter(bool Is64Bit, uint8_t OSABI) {
148 return std::make_unique<SparcELFObjectWriter>(Is64Bit, OSABI);
149 }
150