LLVM 20.0.0git
AVRELFObjectWriter.cpp
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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
11
12#include "llvm/MC/MCAssembler.h"
14#include "llvm/MC/MCExpr.h"
16#include "llvm/MC/MCSection.h"
17#include "llvm/MC/MCValue.h"
19
20namespace llvm {
21
22/// Writes AVR machine code into an ELF32 object file.
24public:
26
27 virtual ~AVRELFObjectWriter() = default;
28
29 unsigned getRelocType(MCContext &Ctx, const MCValue &Target,
30 const MCFixup &Fixup, bool IsPCRel) const override;
31};
32
34 : MCELFObjectTargetWriter(false, OSABI, ELF::EM_AVR, true) {}
35
37 const MCFixup &Fixup,
38 bool IsPCRel) const {
39 const unsigned Kind = Fixup.getTargetKind();
41 return Kind - FirstLiteralRelocationKind;
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");
49 return ELF::R_AVR_8;
51 return ELF::R_AVR_DIFF8;
53 return ELF::R_AVR_8_LO8;
55 return ELF::R_AVR_8_HI8;
57 return ELF::R_AVR_8_HLO8;
58 }
59 case FK_Data_4:
60 switch (Modifier) {
61 default:
62 llvm_unreachable("Unsupported Modifier");
64 return ELF::R_AVR_32;
66 return ELF::R_AVR_DIFF32;
67 }
68 case FK_Data_2:
69 switch (Modifier) {
70 default:
71 llvm_unreachable("Unsupported Modifier");
73 return ELF::R_AVR_16;
76 return ELF::R_AVR_16_PM;
78 return ELF::R_AVR_DIFF16;
79 }
80 case AVR::fixup_32:
81 return ELF::R_AVR_32;
83 return ELF::R_AVR_7_PCREL;
85 return ELF::R_AVR_13_PCREL;
86 case AVR::fixup_16:
87 return ELF::R_AVR_16;
89 return ELF::R_AVR_16_PM;
91 return ELF::R_AVR_LO8_LDI;
93 return ELF::R_AVR_HI8_LDI;
95 return ELF::R_AVR_HH8_LDI;
97 return ELF::R_AVR_LO8_LDI_NEG;
99 return ELF::R_AVR_HI8_LDI_NEG;
101 return ELF::R_AVR_HH8_LDI_NEG;
103 return ELF::R_AVR_LO8_LDI_PM;
105 return ELF::R_AVR_HI8_LDI_PM;
107 return ELF::R_AVR_HH8_LDI_PM;
109 return ELF::R_AVR_LO8_LDI_PM_NEG;
111 return ELF::R_AVR_HI8_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;
121 return ELF::R_AVR_6_ADIW;
123 return ELF::R_AVR_MS8_LDI;
125 return ELF::R_AVR_MS8_LDI_NEG;
127 return ELF::R_AVR_LO8_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;
137 return ELF::R_AVR_8_HLO8;
138 case AVR::fixup_diff8:
139 return ELF::R_AVR_DIFF8;
141 return ELF::R_AVR_DIFF16;
143 return ELF::R_AVR_DIFF32;
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
155std::unique_ptr<MCObjectTargetWriter> createAVRELFObjectWriter(uint8_t OSABI) {
156 return std::make_unique<AVRELFObjectWriter>(OSABI);
157}
158
159} // end of namespace llvm
basic Basic Alias true
PowerPC TLS Dynamic Call Fixup
Writes AVR machine code into an ELF32 object file.
unsigned getRelocType(MCContext &Ctx, const MCValue &Target, const MCFixup &Fixup, bool IsPCRel) const override
virtual ~AVRELFObjectWriter()=default
Context object for machine code objects.
Definition: MCContext.h:83
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.
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
@ fixup_16_pm
A 16-bit program memory address.
Definition: AVRFixupKinds.h:46
@ fixup_16
A 16-bit address.
Definition: AVRFixupKinds.h:44
@ fixup_call
A 22-bit fixup for the target of a CALL k or JMP k instruction.
@ fixup_hh8_ldi
Replaces the immediate operand of a 16-bit Rd, K instruction with the upper 8 bits of a 24-bit value ...
Definition: AVRFixupKinds.h:59
@ fixup_ms8_ldi_neg
Replaces the immediate operand of a 16-bit Rd, K instruction with the upper 8 bits of a negated 32-bi...
Definition: AVRFixupKinds.h:75
@ fixup_32
A 32-bit AVR fixup.
Definition: AVRFixupKinds.h:28
@ fixup_lo8_ldi_neg
Replaces the immediate operand of a 16-bit Rd, K instruction with the lower 8 bits of a negated 16-bi...
Definition: AVRFixupKinds.h:66
@ fixup_6_adiw
A symbol+addr fixup for the `LDD <x>+<n>, <r>" family of instructions.
@ fixup_ms8_ldi
Replaces the immediate operand of a 16-bit Rd, K instruction with the upper 8 bits of a 32-bit value ...
Definition: AVRFixupKinds.h:62
@ fixup_7_pcrel
A 7-bit PC-relative fixup for the family of conditional branches which take 7-bit targets (BRNE,...
Definition: AVRFixupKinds.h:32
@ fixup_ldi
Replaces the 8-bit immediate with another value.
Definition: AVRFixupKinds.h:49
@ fixup_lo8_ldi
Replaces the immediate operand of a 16-bit Rd, K instruction with the lower 8 bits of a 16-bit value ...
Definition: AVRFixupKinds.h:53
@ fixup_hi8_ldi_pm_neg
Replaces the immediate operand of a 16-bit Rd, K instruction with the upper 8 bits of a negated 16-bi...
Definition: AVRFixupKinds.h:96
@ fixup_hi8_ldi
Replaces the immediate operand of a 16-bit Rd, K instruction with the upper 8 bits of a 16-bit value ...
Definition: AVRFixupKinds.h:56
@ fixup_lo8_ldi_pm
Replaces the immediate operand of a 16-bit Rd, K instruction with the lower 8 bits of a 16-bit progra...
Definition: AVRFixupKinds.h:79
@ fixup_port6
A 6-bit port address.
@ fixup_hh8_ldi_neg
Replaces the immediate operand of a 16-bit Rd, K instruction with the upper 8 bits of a negated 24-bi...
Definition: AVRFixupKinds.h:72
@ fixup_hh8_ldi_pm
Replaces the immediate operand of a 16-bit Rd, K instruction with the upper 8 bits of a 24-bit progra...
Definition: AVRFixupKinds.h:87
@ fixup_port5
A 5-bit port address.
@ fixup_lo8_ldi_pm_neg
Replaces the immediate operand of a 16-bit Rd, K instruction with the lower 8 bits of a negated 16-bi...
Definition: AVRFixupKinds.h:92
@ fixup_hi8_ldi_pm
Replaces the immediate operand of a 16-bit Rd, K instruction with the upper 8 bits of a 16-bit progra...
Definition: AVRFixupKinds.h:83
@ fixup_hh8_ldi_pm_neg
Replaces the immediate operand of a 16-bit Rd, K instruction with the upper 8 bits of a negated 24-bi...
@ fixup_13_pcrel
A 12-bit PC-relative fixup for the family of branches which take 12-bit targets (RJMP,...
Definition: AVRFixupKinds.h:41
@ fixup_hi8_ldi_neg
Replaces the immediate operand of a 16-bit Rd, K instruction with the upper 8 bits of a negated 16-bi...
Definition: AVRFixupKinds.h:69
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
@ FirstLiteralRelocationKind
The range [FirstLiteralRelocationKind, MaxTargetFixupKind) is used for relocations coming from ....
Definition: MCFixup.h:50
@ FK_Data_1
A one-byte fixup.
Definition: MCFixup.h:23
@ FK_Data_4
A four-byte fixup.
Definition: MCFixup.h:25
@ FK_Data_2
A two-byte fixup.
Definition: MCFixup.h:24
std::unique_ptr< MCObjectTargetWriter > createAVRELFObjectWriter(uint8_t OSABI)
Creates an ELF object writer for AVR.