1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
//===-- llvm/MC/MCELFObjectWriter.h - ELF Object Writer ---------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_MC_MCELFOBJECTWRITER_H
#define LLVM_MC_MCELFOBJECTWRITER_H
#include "llvm/ADT/Triple.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/ELF.h"
#include <vector>
namespace llvm {
class MCAssembler;
class MCFixup;
class MCFragment;
class MCObjectWriter;
class MCSectionData;
class MCSymbol;
class MCSymbolData;
class MCValue;
class MCELFObjectTargetWriter {
const uint8_t OSABI;
const uint16_t EMachine;
const unsigned HasRelocationAddend : 1;
const unsigned Is64Bit : 1;
const unsigned IsN64 : 1;
protected:
MCELFObjectTargetWriter(bool Is64Bit_, uint8_t OSABI_,
uint16_t EMachine_, bool HasRelocationAddend,
bool IsN64=false);
public:
static uint8_t getOSABI(Triple::OSType OSType) {
switch (OSType) {
case Triple::CloudABI:
return ELF::ELFOSABI_CLOUDABI;
case Triple::PS4:
case Triple::FreeBSD:
return ELF::ELFOSABI_FREEBSD;
case Triple::Linux:
return ELF::ELFOSABI_LINUX;
default:
return ELF::ELFOSABI_NONE;
}
}
virtual ~MCELFObjectTargetWriter() {}
virtual unsigned GetRelocType(const MCValue &Target, const MCFixup &Fixup,
bool IsPCRel) const = 0;
virtual bool needsRelocateWithSymbol(const MCSymbolData &SD,
unsigned Type) const;
/// @name Accessors
/// @{
uint8_t getOSABI() const { return OSABI; }
uint16_t getEMachine() const { return EMachine; }
bool hasRelocationAddend() const { return HasRelocationAddend; }
bool is64Bit() const { return Is64Bit; }
bool isN64() const { return IsN64; }
/// @}
// Instead of changing everyone's API we pack the N64 Type fields
// into the existing 32 bit data unsigned.
#define R_TYPE_SHIFT 0
#define R_TYPE_MASK 0xffffff00
#define R_TYPE2_SHIFT 8
#define R_TYPE2_MASK 0xffff00ff
#define R_TYPE3_SHIFT 16
#define R_TYPE3_MASK 0xff00ffff
#define R_SSYM_SHIFT 24
#define R_SSYM_MASK 0x00ffffff
// N64 relocation type accessors
uint8_t getRType(uint32_t Type) const {
return (unsigned)((Type >> R_TYPE_SHIFT) & 0xff);
}
uint8_t getRType2(uint32_t Type) const {
return (unsigned)((Type >> R_TYPE2_SHIFT) & 0xff);
}
uint8_t getRType3(uint32_t Type) const {
return (unsigned)((Type >> R_TYPE3_SHIFT) & 0xff);
}
uint8_t getRSsym(uint32_t Type) const {
return (unsigned)((Type >> R_SSYM_SHIFT) & 0xff);
}
// N64 relocation type setting
unsigned setRType(unsigned Value, unsigned Type) const {
return ((Type & R_TYPE_MASK) | ((Value & 0xff) << R_TYPE_SHIFT));
}
unsigned setRType2(unsigned Value, unsigned Type) const {
return (Type & R_TYPE2_MASK) | ((Value & 0xff) << R_TYPE2_SHIFT);
}
unsigned setRType3(unsigned Value, unsigned Type) const {
return (Type & R_TYPE3_MASK) | ((Value & 0xff) << R_TYPE3_SHIFT);
}
unsigned setRSsym(unsigned Value, unsigned Type) const {
return (Type & R_SSYM_MASK) | ((Value & 0xff) << R_SSYM_SHIFT);
}
};
/// \brief Construct a new ELF writer instance.
///
/// \param MOTW - The target specific ELF writer subclass.
/// \param OS - The stream to write to.
/// \returns The constructed object writer.
MCObjectWriter *createELFObjectWriter(MCELFObjectTargetWriter *MOTW,
raw_ostream &OS, bool IsLittleEndian);
} // End llvm namespace
#endif
|
