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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
|
//=--- AArch64MCExpr.h - AArch64 specific MC expression classes ---*- C++ -*-=//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file describes AArch64-specific MCExprs, used for modifiers like
// ":lo12:" or ":gottprel_g1:".
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_AARCH64_MCTARGETDESC_AARCH64MCEXPR_H
#define LLVM_LIB_TARGET_AARCH64_MCTARGETDESC_AARCH64MCEXPR_H
#include "llvm/MC/MCExpr.h"
#include "llvm/Support/ErrorHandling.h"
namespace llvm {
class AArch64MCExpr : public MCTargetExpr {
public:
enum VariantKind {
// Symbol locations specifying (roughly speaking) what calculation should be
// performed to construct the final address for the relocated
// symbol. E.g. direct, via the GOT, ...
VK_ABS = 0x001,
VK_SABS = 0x002,
VK_PREL = 0x003,
VK_GOT = 0x004,
VK_DTPREL = 0x005,
VK_GOTTPREL = 0x006,
VK_TPREL = 0x007,
VK_TLSDESC = 0x008,
VK_SECREL = 0x009,
VK_SymLocBits = 0x00f,
// Variants specifying which part of the final address calculation is
// used. E.g. the low 12 bits for an ADD/LDR, the middle 16 bits for a
// MOVZ/MOVK.
VK_PAGE = 0x010,
VK_PAGEOFF = 0x020,
VK_HI12 = 0x030,
VK_G0 = 0x040,
VK_G1 = 0x050,
VK_G2 = 0x060,
VK_G3 = 0x070,
VK_LO15 = 0x080,
VK_AddressFragBits = 0x0f0,
// Whether the final relocation is a checked one (where a linker should
// perform a range-check on the final address) or not. Note that this field
// is unfortunately sometimes omitted from the assembly syntax. E.g. :lo12:
// on its own is a non-checked relocation. We side with ELF on being
// explicit about this!
VK_NC = 0x100,
// Convenience definitions for referring to specific textual representations
// of relocation specifiers. Note that this means the "_NC" is sometimes
// omitted in line with assembly syntax here (VK_LO12 rather than VK_LO12_NC
// since a user would write ":lo12:").
VK_CALL = VK_ABS,
VK_ABS_PAGE = VK_ABS | VK_PAGE,
VK_ABS_PAGE_NC = VK_ABS | VK_PAGE | VK_NC,
VK_ABS_G3 = VK_ABS | VK_G3,
VK_ABS_G2 = VK_ABS | VK_G2,
VK_ABS_G2_S = VK_SABS | VK_G2,
VK_ABS_G2_NC = VK_ABS | VK_G2 | VK_NC,
VK_ABS_G1 = VK_ABS | VK_G1,
VK_ABS_G1_S = VK_SABS | VK_G1,
VK_ABS_G1_NC = VK_ABS | VK_G1 | VK_NC,
VK_ABS_G0 = VK_ABS | VK_G0,
VK_ABS_G0_S = VK_SABS | VK_G0,
VK_ABS_G0_NC = VK_ABS | VK_G0 | VK_NC,
VK_LO12 = VK_ABS | VK_PAGEOFF | VK_NC,
VK_PREL_G3 = VK_PREL | VK_G3,
VK_PREL_G2 = VK_PREL | VK_G2,
VK_PREL_G2_NC = VK_PREL | VK_G2 | VK_NC,
VK_PREL_G1 = VK_PREL | VK_G1,
VK_PREL_G1_NC = VK_PREL | VK_G1 | VK_NC,
VK_PREL_G0 = VK_PREL | VK_G0,
VK_PREL_G0_NC = VK_PREL | VK_G0 | VK_NC,
VK_GOT_LO12 = VK_GOT | VK_PAGEOFF | VK_NC,
VK_GOT_PAGE = VK_GOT | VK_PAGE,
VK_GOT_PAGE_LO15 = VK_GOT | VK_LO15 | VK_NC,
VK_DTPREL_G2 = VK_DTPREL | VK_G2,
VK_DTPREL_G1 = VK_DTPREL | VK_G1,
VK_DTPREL_G1_NC = VK_DTPREL | VK_G1 | VK_NC,
VK_DTPREL_G0 = VK_DTPREL | VK_G0,
VK_DTPREL_G0_NC = VK_DTPREL | VK_G0 | VK_NC,
VK_DTPREL_HI12 = VK_DTPREL | VK_HI12,
VK_DTPREL_LO12 = VK_DTPREL | VK_PAGEOFF,
VK_DTPREL_LO12_NC = VK_DTPREL | VK_PAGEOFF | VK_NC,
VK_GOTTPREL_PAGE = VK_GOTTPREL | VK_PAGE,
VK_GOTTPREL_LO12_NC = VK_GOTTPREL | VK_PAGEOFF | VK_NC,
VK_GOTTPREL_G1 = VK_GOTTPREL | VK_G1,
VK_GOTTPREL_G0_NC = VK_GOTTPREL | VK_G0 | VK_NC,
VK_TPREL_G2 = VK_TPREL | VK_G2,
VK_TPREL_G1 = VK_TPREL | VK_G1,
VK_TPREL_G1_NC = VK_TPREL | VK_G1 | VK_NC,
VK_TPREL_G0 = VK_TPREL | VK_G0,
VK_TPREL_G0_NC = VK_TPREL | VK_G0 | VK_NC,
VK_TPREL_HI12 = VK_TPREL | VK_HI12,
VK_TPREL_LO12 = VK_TPREL | VK_PAGEOFF,
VK_TPREL_LO12_NC = VK_TPREL | VK_PAGEOFF | VK_NC,
VK_TLSDESC_LO12 = VK_TLSDESC | VK_PAGEOFF,
VK_TLSDESC_PAGE = VK_TLSDESC | VK_PAGE,
VK_SECREL_LO12 = VK_SECREL | VK_PAGEOFF,
VK_SECREL_HI12 = VK_SECREL | VK_HI12,
VK_INVALID = 0xfff
};
private:
const MCExpr *Expr;
const VariantKind Kind;
explicit AArch64MCExpr(const MCExpr *Expr, VariantKind Kind)
: Expr(Expr), Kind(Kind) {}
public:
/// @name Construction
/// @{
static const AArch64MCExpr *create(const MCExpr *Expr, VariantKind Kind,
MCContext &Ctx);
/// @}
/// @name Accessors
/// @{
/// Get the kind of this expression.
VariantKind getKind() const { return Kind; }
/// Get the expression this modifier applies to.
const MCExpr *getSubExpr() const { return Expr; }
/// @}
/// @name VariantKind information extractors.
/// @{
static VariantKind getSymbolLoc(VariantKind Kind) {
return static_cast<VariantKind>(Kind & VK_SymLocBits);
}
static VariantKind getAddressFrag(VariantKind Kind) {
return static_cast<VariantKind>(Kind & VK_AddressFragBits);
}
static bool isNotChecked(VariantKind Kind) { return Kind & VK_NC; }
/// @}
/// Convert the variant kind into an ELF-appropriate modifier
/// (e.g. ":got:", ":lo12:").
StringRef getVariantKindName() const;
void printImpl(raw_ostream &OS, const MCAsmInfo *MAI) const override;
void visitUsedExpr(MCStreamer &Streamer) const override;
MCFragment *findAssociatedFragment() const override;
bool evaluateAsRelocatableImpl(MCValue &Res, const MCAsmLayout *Layout,
const MCFixup *Fixup) const override;
void fixELFSymbolsInTLSFixups(MCAssembler &Asm) const override;
static bool classof(const MCExpr *E) {
return E->getKind() == MCExpr::Target;
}
};
} // end namespace llvm
#endif
|
