1 //===-- AVRELFObjectWriter.cpp - AVR ELF Writer ---------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "MCTargetDesc/AVRFixupKinds.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       return ELF::R_AVR_16_PM;
77     case MCSymbolRefExpr::VK_AVR_DIFF16:
78       return ELF::R_AVR_DIFF16;
79     }
80   case AVR::fixup_32:
81     return ELF::R_AVR_32;
82   case AVR::fixup_7_pcrel:
83     return ELF::R_AVR_7_PCREL;
84   case AVR::fixup_13_pcrel:
85     return ELF::R_AVR_13_PCREL;
86   case AVR::fixup_16:
87     return ELF::R_AVR_16;
88   case AVR::fixup_16_pm:
89     return ELF::R_AVR_16_PM;
90   case AVR::fixup_lo8_ldi:
91     return ELF::R_AVR_LO8_LDI;
92   case AVR::fixup_hi8_ldi:
93     return ELF::R_AVR_HI8_LDI;
94   case AVR::fixup_hh8_ldi:
95     return ELF::R_AVR_HH8_LDI;
96   case AVR::fixup_lo8_ldi_neg:
97     return ELF::R_AVR_LO8_LDI_NEG;
98   case AVR::fixup_hi8_ldi_neg:
99     return ELF::R_AVR_HI8_LDI_NEG;
100   case AVR::fixup_hh8_ldi_neg:
101     return ELF::R_AVR_HH8_LDI_NEG;
102   case AVR::fixup_lo8_ldi_pm:
103     return ELF::R_AVR_LO8_LDI_PM;
104   case AVR::fixup_hi8_ldi_pm:
105     return ELF::R_AVR_HI8_LDI_PM;
106   case AVR::fixup_hh8_ldi_pm:
107     return ELF::R_AVR_HH8_LDI_PM;
108   case AVR::fixup_lo8_ldi_pm_neg:
109     return ELF::R_AVR_LO8_LDI_PM_NEG;
110   case AVR::fixup_hi8_ldi_pm_neg:
111     return ELF::R_AVR_HI8_LDI_PM_NEG;
112   case AVR::fixup_hh8_ldi_pm_neg:
113     return ELF::R_AVR_HH8_LDI_PM_NEG;
114   case AVR::fixup_call:
115     return ELF::R_AVR_CALL;
116   case AVR::fixup_ldi:
117     return ELF::R_AVR_LDI;
118   case AVR::fixup_6:
119     return ELF::R_AVR_6;
120   case AVR::fixup_6_adiw:
121     return ELF::R_AVR_6_ADIW;
122   case AVR::fixup_ms8_ldi:
123     return ELF::R_AVR_MS8_LDI;
124   case AVR::fixup_ms8_ldi_neg:
125     return ELF::R_AVR_MS8_LDI_NEG;
126   case AVR::fixup_lo8_ldi_gs:
127     return ELF::R_AVR_LO8_LDI_GS;
128   case AVR::fixup_hi8_ldi_gs:
129     return ELF::R_AVR_HI8_LDI_GS;
130   case AVR::fixup_8:
131     return ELF::R_AVR_8;
132   case AVR::fixup_8_lo8:
133     return ELF::R_AVR_8_LO8;
134   case AVR::fixup_8_hi8:
135     return ELF::R_AVR_8_HI8;
136   case AVR::fixup_8_hlo8:
137     return ELF::R_AVR_8_HLO8;
138   case AVR::fixup_diff8:
139     return ELF::R_AVR_DIFF8;
140   case AVR::fixup_diff16:
141     return ELF::R_AVR_DIFF16;
142   case AVR::fixup_diff32:
143     return ELF::R_AVR_DIFF32;
144   case AVR::fixup_lds_sts_16:
145     return ELF::R_AVR_LDS_STS_16;
146   case AVR::fixup_port6:
147     return ELF::R_AVR_PORT6;
148   case AVR::fixup_port5:
149     return ELF::R_AVR_PORT5;
150   default:
151     llvm_unreachable("invalid fixup kind!");
152   }
153 }
154 
155 std::unique_ptr<MCObjectTargetWriter> createAVRELFObjectWriter(uint8_t OSABI) {
156   return make_unique<AVRELFObjectWriter>(OSABI);
157 }
158 
159 } // end of namespace llvm
160 
161