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/AVRMCExpr.h"
11 #include "MCTargetDesc/AVRMCTargetDesc.h"
12 
13 #include "llvm/MC/MCAssembler.h"
14 #include "llvm/MC/MCELFObjectWriter.h"
15 #include "llvm/MC/MCExpr.h"
16 #include "llvm/MC/MCObjectWriter.h"
17 #include "llvm/MC/MCSection.h"
18 #include "llvm/MC/MCValue.h"
19 #include "llvm/Support/ErrorHandling.h"
20 
21 namespace llvm {
22 
23 /// Writes AVR machine code into an ELF32 object file.
24 class AVRELFObjectWriter : public MCELFObjectTargetWriter {
25 public:
26   AVRELFObjectWriter(uint8_t OSABI);
27 
28   virtual ~AVRELFObjectWriter() {}
29 
30   unsigned getRelocType(MCContext &Ctx,
31                         const MCValue &Target,
32                         const MCFixup &Fixup,
33                         bool IsPCRel) const override;
34 };
35 
36 AVRELFObjectWriter::AVRELFObjectWriter(uint8_t OSABI)
37     : MCELFObjectTargetWriter(false, OSABI, ELF::EM_AVR, true) {}
38 
39 unsigned AVRELFObjectWriter::getRelocType(MCContext &Ctx,
40                                           const MCValue &Target,
41                                           const MCFixup &Fixup,
42                                           bool IsPCRel) const {
43   MCSymbolRefExpr::VariantKind Modifier = Target.getAccessVariant();
44   switch ((unsigned) Fixup.getKind()) {
45   case FK_Data_1:
46     switch (Modifier) {
47     default:
48       llvm_unreachable("Unsupported Modifier");
49     case MCSymbolRefExpr::VK_None:
50       return ELF::R_AVR_8;
51     case MCSymbolRefExpr::VK_AVR_DIFF8:
52       return ELF::R_AVR_DIFF8;
53     case MCSymbolRefExpr::VK_AVR_LO8:
54       return ELF::R_AVR_8_LO8;
55     case MCSymbolRefExpr::VK_AVR_HI8:
56       return ELF::R_AVR_8_HI8;
57     case MCSymbolRefExpr::VK_AVR_HLO8:
58       return ELF::R_AVR_8_HLO8;
59     }
60   case FK_Data_4:
61     switch (Modifier) {
62     default:
63       llvm_unreachable("Unsupported Modifier");
64     case MCSymbolRefExpr::VK_None:
65       return ELF::R_AVR_32;
66     case MCSymbolRefExpr::VK_AVR_DIFF32:
67       return ELF::R_AVR_DIFF32;
68     }
69   case FK_Data_2:
70     switch (Modifier) {
71     default:
72       llvm_unreachable("Unsupported Modifier");
73     case MCSymbolRefExpr::VK_None:
74       return ELF::R_AVR_16;
75     case MCSymbolRefExpr::VK_AVR_NONE:
76     case MCSymbolRefExpr::VK_AVR_PM:
77       return ELF::R_AVR_16_PM;
78     case MCSymbolRefExpr::VK_AVR_DIFF16:
79       return ELF::R_AVR_DIFF16;
80     }
81   case AVR::fixup_32:
82     return ELF::R_AVR_32;
83   case AVR::fixup_7_pcrel:
84     return ELF::R_AVR_7_PCREL;
85   case AVR::fixup_13_pcrel:
86     return ELF::R_AVR_13_PCREL;
87   case AVR::fixup_16:
88     return ELF::R_AVR_16;
89   case AVR::fixup_16_pm:
90     return ELF::R_AVR_16_PM;
91   case AVR::fixup_lo8_ldi:
92     return ELF::R_AVR_LO8_LDI;
93   case AVR::fixup_hi8_ldi:
94     return ELF::R_AVR_HI8_LDI;
95   case AVR::fixup_hh8_ldi:
96     return ELF::R_AVR_HH8_LDI;
97   case AVR::fixup_lo8_ldi_neg:
98     return ELF::R_AVR_LO8_LDI_NEG;
99   case AVR::fixup_hi8_ldi_neg:
100     return ELF::R_AVR_HI8_LDI_NEG;
101   case AVR::fixup_hh8_ldi_neg:
102     return ELF::R_AVR_HH8_LDI_NEG;
103   case AVR::fixup_lo8_ldi_pm:
104     return ELF::R_AVR_LO8_LDI_PM;
105   case AVR::fixup_hi8_ldi_pm:
106     return ELF::R_AVR_HI8_LDI_PM;
107   case AVR::fixup_hh8_ldi_pm:
108     return ELF::R_AVR_HH8_LDI_PM;
109   case AVR::fixup_lo8_ldi_pm_neg:
110     return ELF::R_AVR_LO8_LDI_PM_NEG;
111   case AVR::fixup_hi8_ldi_pm_neg:
112     return ELF::R_AVR_HI8_LDI_PM_NEG;
113   case AVR::fixup_hh8_ldi_pm_neg:
114     return ELF::R_AVR_HH8_LDI_PM_NEG;
115   case AVR::fixup_call:
116     return ELF::R_AVR_CALL;
117   case AVR::fixup_ldi:
118     return ELF::R_AVR_LDI;
119   case AVR::fixup_6:
120     return ELF::R_AVR_6;
121   case AVR::fixup_6_adiw:
122     return ELF::R_AVR_6_ADIW;
123   case AVR::fixup_ms8_ldi:
124     return ELF::R_AVR_MS8_LDI;
125   case AVR::fixup_ms8_ldi_neg:
126     return ELF::R_AVR_MS8_LDI_NEG;
127   case AVR::fixup_lo8_ldi_gs:
128     return ELF::R_AVR_LO8_LDI_GS;
129   case AVR::fixup_hi8_ldi_gs:
130     return ELF::R_AVR_HI8_LDI_GS;
131   case AVR::fixup_8:
132     return ELF::R_AVR_8;
133   case AVR::fixup_8_lo8:
134     return ELF::R_AVR_8_LO8;
135   case AVR::fixup_8_hi8:
136     return ELF::R_AVR_8_HI8;
137   case AVR::fixup_8_hlo8:
138     return ELF::R_AVR_8_HLO8;
139   case AVR::fixup_diff8:
140     return ELF::R_AVR_DIFF8;
141   case AVR::fixup_diff16:
142     return ELF::R_AVR_DIFF16;
143   case AVR::fixup_diff32:
144     return ELF::R_AVR_DIFF32;
145   case AVR::fixup_lds_sts_16:
146     return ELF::R_AVR_LDS_STS_16;
147   case AVR::fixup_port6:
148     return ELF::R_AVR_PORT6;
149   case AVR::fixup_port5:
150     return ELF::R_AVR_PORT5;
151   default:
152     llvm_unreachable("invalid fixup kind!");
153   }
154 }
155 
156 std::unique_ptr<MCObjectTargetWriter> createAVRELFObjectWriter(uint8_t OSABI) {
157   return std::make_unique<AVRELFObjectWriter>(OSABI);
158 }
159 
160 } // end of namespace llvm
161 
162