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() = default;
29 
30   unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
31                         const MCFixup &Fixup, bool IsPCRel) const override;
32 };
33 
AVRELFObjectWriter(uint8_t OSABI)34 AVRELFObjectWriter::AVRELFObjectWriter(uint8_t OSABI)
35     : MCELFObjectTargetWriter(false, OSABI, ELF::EM_AVR, true) {}
36 
getRelocType(MCContext & Ctx,const MCValue & Target,const MCFixup & Fixup,bool IsPCRel) const37 unsigned AVRELFObjectWriter::getRelocType(MCContext &Ctx, const MCValue &Target,
38                                           const MCFixup &Fixup,
39                                           bool IsPCRel) const {
40   MCSymbolRefExpr::VariantKind Modifier = Target.getAccessVariant();
41   switch ((unsigned)Fixup.getKind()) {
42   case FK_Data_1:
43     switch (Modifier) {
44     default:
45       llvm_unreachable("Unsupported Modifier");
46     case MCSymbolRefExpr::VK_None:
47       return ELF::R_AVR_8;
48     case MCSymbolRefExpr::VK_AVR_DIFF8:
49       return ELF::R_AVR_DIFF8;
50     case MCSymbolRefExpr::VK_AVR_LO8:
51       return ELF::R_AVR_8_LO8;
52     case MCSymbolRefExpr::VK_AVR_HI8:
53       return ELF::R_AVR_8_HI8;
54     case MCSymbolRefExpr::VK_AVR_HLO8:
55       return ELF::R_AVR_8_HLO8;
56     }
57   case FK_Data_4:
58     switch (Modifier) {
59     default:
60       llvm_unreachable("Unsupported Modifier");
61     case MCSymbolRefExpr::VK_None:
62       return ELF::R_AVR_32;
63     case MCSymbolRefExpr::VK_AVR_DIFF32:
64       return ELF::R_AVR_DIFF32;
65     }
66   case FK_Data_2:
67     switch (Modifier) {
68     default:
69       llvm_unreachable("Unsupported Modifier");
70     case MCSymbolRefExpr::VK_None:
71       return ELF::R_AVR_16;
72     case MCSymbolRefExpr::VK_AVR_NONE:
73     case MCSymbolRefExpr::VK_AVR_PM:
74       return ELF::R_AVR_16_PM;
75     case MCSymbolRefExpr::VK_AVR_DIFF16:
76       return ELF::R_AVR_DIFF16;
77     }
78   case AVR::fixup_32:
79     return ELF::R_AVR_32;
80   case AVR::fixup_7_pcrel:
81     return ELF::R_AVR_7_PCREL;
82   case AVR::fixup_13_pcrel:
83     return ELF::R_AVR_13_PCREL;
84   case AVR::fixup_16:
85     return ELF::R_AVR_16;
86   case AVR::fixup_16_pm:
87     return ELF::R_AVR_16_PM;
88   case AVR::fixup_lo8_ldi:
89     return ELF::R_AVR_LO8_LDI;
90   case AVR::fixup_hi8_ldi:
91     return ELF::R_AVR_HI8_LDI;
92   case AVR::fixup_hh8_ldi:
93     return ELF::R_AVR_HH8_LDI;
94   case AVR::fixup_lo8_ldi_neg:
95     return ELF::R_AVR_LO8_LDI_NEG;
96   case AVR::fixup_hi8_ldi_neg:
97     return ELF::R_AVR_HI8_LDI_NEG;
98   case AVR::fixup_hh8_ldi_neg:
99     return ELF::R_AVR_HH8_LDI_NEG;
100   case AVR::fixup_lo8_ldi_pm:
101     return ELF::R_AVR_LO8_LDI_PM;
102   case AVR::fixup_hi8_ldi_pm:
103     return ELF::R_AVR_HI8_LDI_PM;
104   case AVR::fixup_hh8_ldi_pm:
105     return ELF::R_AVR_HH8_LDI_PM;
106   case AVR::fixup_lo8_ldi_pm_neg:
107     return ELF::R_AVR_LO8_LDI_PM_NEG;
108   case AVR::fixup_hi8_ldi_pm_neg:
109     return ELF::R_AVR_HI8_LDI_PM_NEG;
110   case AVR::fixup_hh8_ldi_pm_neg:
111     return ELF::R_AVR_HH8_LDI_PM_NEG;
112   case AVR::fixup_call:
113     return ELF::R_AVR_CALL;
114   case AVR::fixup_ldi:
115     return ELF::R_AVR_LDI;
116   case AVR::fixup_6:
117     return ELF::R_AVR_6;
118   case AVR::fixup_6_adiw:
119     return ELF::R_AVR_6_ADIW;
120   case AVR::fixup_ms8_ldi:
121     return ELF::R_AVR_MS8_LDI;
122   case AVR::fixup_ms8_ldi_neg:
123     return ELF::R_AVR_MS8_LDI_NEG;
124   case AVR::fixup_lo8_ldi_gs:
125     return ELF::R_AVR_LO8_LDI_GS;
126   case AVR::fixup_hi8_ldi_gs:
127     return ELF::R_AVR_HI8_LDI_GS;
128   case AVR::fixup_8:
129     return ELF::R_AVR_8;
130   case AVR::fixup_8_lo8:
131     return ELF::R_AVR_8_LO8;
132   case AVR::fixup_8_hi8:
133     return ELF::R_AVR_8_HI8;
134   case AVR::fixup_8_hlo8:
135     return ELF::R_AVR_8_HLO8;
136   case AVR::fixup_diff8:
137     return ELF::R_AVR_DIFF8;
138   case AVR::fixup_diff16:
139     return ELF::R_AVR_DIFF16;
140   case AVR::fixup_diff32:
141     return ELF::R_AVR_DIFF32;
142   case AVR::fixup_lds_sts_16:
143     return ELF::R_AVR_LDS_STS_16;
144   case AVR::fixup_port6:
145     return ELF::R_AVR_PORT6;
146   case AVR::fixup_port5:
147     return ELF::R_AVR_PORT5;
148   default:
149     llvm_unreachable("invalid fixup kind!");
150   }
151 }
152 
createAVRELFObjectWriter(uint8_t OSABI)153 std::unique_ptr<MCObjectTargetWriter> createAVRELFObjectWriter(uint8_t OSABI) {
154   return std::make_unique<AVRELFObjectWriter>(OSABI);
155 }
156 
157 } // end of namespace llvm
158