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