LLVM 20.0.0git
M68kELFObjectWriter.cpp
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1//===-- M68kELFObjectWriter.cpp - M68k ELF Writer ---------------*- C++ -*-===//
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/// \file
10/// This file contains definitions for M68k ELF Writers
11///
12//===----------------------------------------------------------------------===//
13
16
18#include "llvm/MC/MCAsmInfo.h"
19#include "llvm/MC/MCContext.h"
21#include "llvm/MC/MCExpr.h"
22#include "llvm/MC/MCValue.h"
24
25using namespace llvm;
26
27namespace {
28class M68kELFObjectWriter : public MCELFObjectTargetWriter {
29public:
30 M68kELFObjectWriter(uint8_t OSABI);
31
32 ~M68kELFObjectWriter() override;
33
34protected:
35 unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
36 const MCFixup &Fixup, bool IsPCRel) const override;
37};
38} // namespace
39
40M68kELFObjectWriter::M68kELFObjectWriter(uint8_t OSABI)
41 : MCELFObjectTargetWriter(false, OSABI, ELF::EM_68K, /* RELA */ true) {}
42
43M68kELFObjectWriter::~M68kELFObjectWriter() {}
44
46
47static M68kRelType
48getType(unsigned Kind, MCSymbolRefExpr::VariantKind &Modifier, bool &IsPCRel) {
49 switch (Kind) {
50 case FK_Data_4:
51 case FK_PCRel_4:
52 return RT_32;
53 case FK_PCRel_2:
54 case FK_Data_2:
55 return RT_16;
56 case FK_PCRel_1:
57 case FK_Data_1:
58 return RT_8;
59 }
60 llvm_unreachable("Unimplemented");
61}
62
63unsigned M68kELFObjectWriter::getRelocType(MCContext &Ctx,
64 const MCValue &Target,
65 const MCFixup &Fixup,
66 bool IsPCRel) const {
67 MCSymbolRefExpr::VariantKind Modifier = Target.getAccessVariant();
68 unsigned Kind = Fixup.getKind();
69 M68kRelType Type = getType(Kind, Modifier, IsPCRel);
70 switch (Modifier) {
71 default:
72 llvm_unreachable("Unimplemented");
73
75 switch (Type) {
76 case RT_32:
77 return ELF::R_68K_TLS_GD32;
78 case RT_16:
79 return ELF::R_68K_TLS_GD16;
80 case RT_8:
81 return ELF::R_68K_TLS_GD8;
82 }
83 llvm_unreachable("Unrecognized size");
85 switch (Type) {
86 case RT_32:
87 return ELF::R_68K_TLS_LDM32;
88 case RT_16:
89 return ELF::R_68K_TLS_LDM16;
90 case RT_8:
91 return ELF::R_68K_TLS_LDM8;
92 }
93 llvm_unreachable("Unrecognized size");
95 switch (Type) {
96 case RT_32:
97 return ELF::R_68K_TLS_LDO32;
98 case RT_16:
99 return ELF::R_68K_TLS_LDO16;
100 case RT_8:
101 return ELF::R_68K_TLS_LDO8;
102 }
103 llvm_unreachable("Unrecognized size");
105 switch (Type) {
106 case RT_32:
107 return ELF::R_68K_TLS_IE32;
108 case RT_16:
109 return ELF::R_68K_TLS_IE16;
110 case RT_8:
111 return ELF::R_68K_TLS_IE8;
112 }
113 llvm_unreachable("Unrecognized size");
115 switch (Type) {
116 case RT_32:
117 return ELF::R_68K_TLS_LE32;
118 case RT_16:
119 return ELF::R_68K_TLS_LE16;
120 case RT_8:
121 return ELF::R_68K_TLS_LE8;
122 }
123 llvm_unreachable("Unrecognized size");
125 switch (Type) {
126 case RT_32:
127 return IsPCRel ? ELF::R_68K_PC32 : ELF::R_68K_32;
128 case RT_16:
129 return IsPCRel ? ELF::R_68K_PC16 : ELF::R_68K_16;
130 case RT_8:
131 return IsPCRel ? ELF::R_68K_PC8 : ELF::R_68K_8;
132 }
133 llvm_unreachable("Unrecognized size");
135 switch (Type) {
136 case RT_32:
137 return ELF::R_68K_GOTPCREL32;
138 case RT_16:
139 return ELF::R_68K_GOTPCREL16;
140 case RT_8:
141 return ELF::R_68K_GOTPCREL8;
142 }
143 llvm_unreachable("Unrecognized size");
145 assert(!IsPCRel);
146 switch (Type) {
147 case RT_32:
148 return ELF::R_68K_GOTOFF32;
149 case RT_16:
150 return ELF::R_68K_GOTOFF16;
151 case RT_8:
152 return ELF::R_68K_GOTOFF8;
153 }
154 llvm_unreachable("Unrecognized size");
156 switch (Type) {
157 case RT_32:
158 return ELF::R_68K_PLT32;
159 case RT_16:
160 return ELF::R_68K_PLT16;
161 case RT_8:
162 return ELF::R_68K_PLT8;
163 }
164 llvm_unreachable("Unrecognized size");
165 }
166}
167
168std::unique_ptr<MCObjectTargetWriter>
170 return std::make_unique<M68kELFObjectWriter>(OSABI);
171}
basic Basic Alias true
static M68kRelType getType(unsigned Kind, MCSymbolRefExpr::VariantKind &Modifier, bool &IsPCRel)
This file contains M68k specific fixup entries.
This file provides M68k specific target descriptions.
PowerPC TLS Dynamic Call Fixup
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
Context object for machine code objects.
Definition: MCContext.h:83
virtual unsigned getRelocType(MCContext &Ctx, const MCValue &Target, const MCFixup &Fixup, bool IsPCRel) const =0
Encode information on a single operation to perform on a byte sequence (e.g., an encoded instruction)...
Definition: MCFixup.h:71
This represents an "assembler immediate".
Definition: MCValue.h:36
Target - Wrapper for Target specific information.
The instances of the Type class are immutable: once they are created, they are never changed.
Definition: Type.h:45
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
@ EM_68K
Definition: ELF.h:138
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
std::unique_ptr< MCObjectTargetWriter > createM68kELFObjectWriter(uint8_t OSABI)
Construct an M68k ELF object writer.
@ FK_PCRel_4
A four-byte pc relative fixup.
Definition: MCFixup.h:30
@ FK_PCRel_2
A two-byte pc relative fixup.
Definition: MCFixup.h:29
@ FK_Data_1
A one-byte fixup.
Definition: MCFixup.h:23
@ FK_Data_4
A four-byte fixup.
Definition: MCFixup.h:25
@ FK_PCRel_1
A one-byte pc relative fixup.
Definition: MCFixup.h:28
@ FK_Data_2
A two-byte fixup.
Definition: MCFixup.h:24