1 //===-- AVRELFObjectWriter.cpp - AVR 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/AVRFixupKinds.h"
10 #include "MCTargetDesc/AVRMCTargetDesc.h"
11
12 #include "llvm/MC/MCAssembler.h"
13 #include "llvm/MC/MCELFObjectWriter.h"
14 #include "llvm/MC/MCExpr.h"
15 #include "llvm/MC/MCObjectWriter.h"
16 #include "llvm/MC/MCSection.h"
17 #include "llvm/MC/MCValue.h"
18 #include "llvm/Support/ErrorHandling.h"
19
20 namespace llvm {
21
22 /// Writes AVR machine code into an ELF32 object file.
23 class AVRELFObjectWriter : public MCELFObjectTargetWriter {
24 public:
25 AVRELFObjectWriter(uint8_t OSABI);
26
~AVRELFObjectWriter()27 virtual ~AVRELFObjectWriter() {}
28
29 unsigned getRelocType(MCContext &Ctx,
30 const MCValue &Target,
31 const MCFixup &Fixup,
32 bool IsPCRel) const override;
33 };
34
AVRELFObjectWriter(uint8_t OSABI)35 AVRELFObjectWriter::AVRELFObjectWriter(uint8_t OSABI)
36 : MCELFObjectTargetWriter(false, OSABI, ELF::EM_AVR, true) {}
37
getRelocType(MCContext & Ctx,const MCValue & Target,const MCFixup & Fixup,bool IsPCRel) const38 unsigned AVRELFObjectWriter::getRelocType(MCContext &Ctx,
39 const MCValue &Target,
40 const MCFixup &Fixup,
41 bool IsPCRel) const {
42 MCSymbolRefExpr::VariantKind Modifier = Target.getAccessVariant();
43 switch ((unsigned) Fixup.getKind()) {
44 case FK_Data_1:
45 switch (Modifier) {
46 default:
47 llvm_unreachable("Unsupported Modifier");
48 case MCSymbolRefExpr::VK_None:
49 return ELF::R_AVR_8;
50 case MCSymbolRefExpr::VK_AVR_DIFF8:
51 return ELF::R_AVR_DIFF8;
52 case MCSymbolRefExpr::VK_AVR_LO8:
53 return ELF::R_AVR_8_LO8;
54 case MCSymbolRefExpr::VK_AVR_HI8:
55 return ELF::R_AVR_8_HI8;
56 case MCSymbolRefExpr::VK_AVR_HLO8:
57 return ELF::R_AVR_8_HLO8;
58 }
59 case FK_Data_4:
60 switch (Modifier) {
61 default:
62 llvm_unreachable("Unsupported Modifier");
63 case MCSymbolRefExpr::VK_None:
64 return ELF::R_AVR_32;
65 case MCSymbolRefExpr::VK_AVR_DIFF32:
66 return ELF::R_AVR_DIFF32;
67 }
68 case FK_Data_2:
69 switch (Modifier) {
70 default:
71 llvm_unreachable("Unsupported Modifier");
72 case MCSymbolRefExpr::VK_None:
73 return ELF::R_AVR_16;
74 case MCSymbolRefExpr::VK_AVR_NONE:
75 return ELF::R_AVR_16_PM;
76 case MCSymbolRefExpr::VK_AVR_DIFF16:
77 return ELF::R_AVR_DIFF16;
78 }
79 case AVR::fixup_32:
80 return ELF::R_AVR_32;
81 case AVR::fixup_7_pcrel:
82 return ELF::R_AVR_7_PCREL;
83 case AVR::fixup_13_pcrel:
84 return ELF::R_AVR_13_PCREL;
85 case AVR::fixup_16:
86 return ELF::R_AVR_16;
87 case AVR::fixup_16_pm:
88 return ELF::R_AVR_16_PM;
89 case AVR::fixup_lo8_ldi:
90 return ELF::R_AVR_LO8_LDI;
91 case AVR::fixup_hi8_ldi:
92 return ELF::R_AVR_HI8_LDI;
93 case AVR::fixup_hh8_ldi:
94 return ELF::R_AVR_HH8_LDI;
95 case AVR::fixup_lo8_ldi_neg:
96 return ELF::R_AVR_LO8_LDI_NEG;
97 case AVR::fixup_hi8_ldi_neg:
98 return ELF::R_AVR_HI8_LDI_NEG;
99 case AVR::fixup_hh8_ldi_neg:
100 return ELF::R_AVR_HH8_LDI_NEG;
101 case AVR::fixup_lo8_ldi_pm:
102 return ELF::R_AVR_LO8_LDI_PM;
103 case AVR::fixup_hi8_ldi_pm:
104 return ELF::R_AVR_HI8_LDI_PM;
105 case AVR::fixup_hh8_ldi_pm:
106 return ELF::R_AVR_HH8_LDI_PM;
107 case AVR::fixup_lo8_ldi_pm_neg:
108 return ELF::R_AVR_LO8_LDI_PM_NEG;
109 case AVR::fixup_hi8_ldi_pm_neg:
110 return ELF::R_AVR_HI8_LDI_PM_NEG;
111 case AVR::fixup_hh8_ldi_pm_neg:
112 return ELF::R_AVR_HH8_LDI_PM_NEG;
113 case AVR::fixup_call:
114 return ELF::R_AVR_CALL;
115 case AVR::fixup_ldi:
116 return ELF::R_AVR_LDI;
117 case AVR::fixup_6:
118 return ELF::R_AVR_6;
119 case AVR::fixup_6_adiw:
120 return ELF::R_AVR_6_ADIW;
121 case AVR::fixup_ms8_ldi:
122 return ELF::R_AVR_MS8_LDI;
123 case AVR::fixup_ms8_ldi_neg:
124 return ELF::R_AVR_MS8_LDI_NEG;
125 case AVR::fixup_lo8_ldi_gs:
126 return ELF::R_AVR_LO8_LDI_GS;
127 case AVR::fixup_hi8_ldi_gs:
128 return ELF::R_AVR_HI8_LDI_GS;
129 case AVR::fixup_8:
130 return ELF::R_AVR_8;
131 case AVR::fixup_8_lo8:
132 return ELF::R_AVR_8_LO8;
133 case AVR::fixup_8_hi8:
134 return ELF::R_AVR_8_HI8;
135 case AVR::fixup_8_hlo8:
136 return ELF::R_AVR_8_HLO8;
137 case AVR::fixup_diff8:
138 return ELF::R_AVR_DIFF8;
139 case AVR::fixup_diff16:
140 return ELF::R_AVR_DIFF16;
141 case AVR::fixup_diff32:
142 return ELF::R_AVR_DIFF32;
143 case AVR::fixup_lds_sts_16:
144 return ELF::R_AVR_LDS_STS_16;
145 case AVR::fixup_port6:
146 return ELF::R_AVR_PORT6;
147 case AVR::fixup_port5:
148 return ELF::R_AVR_PORT5;
149 default:
150 llvm_unreachable("invalid fixup kind!");
151 }
152 }
153
createAVRELFObjectWriter(uint8_t OSABI)154 std::unique_ptr<MCObjectTargetWriter> createAVRELFObjectWriter(uint8_t OSABI) {
155 return std::make_unique<AVRELFObjectWriter>(OSABI);
156 }
157
158 } // end of namespace llvm
159
160