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
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
|
//===-- AArch64WinCOFFStreamer.cpp - ARM Target WinCOFF Streamer ----*- 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
//
//===----------------------------------------------------------------------===//
#include "AArch64WinCOFFStreamer.h"
#include "llvm/MC/MCAsmBackend.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCObjectWriter.h"
#include "llvm/MC/MCWin64EH.h"
#include "llvm/MC/MCWinCOFFStreamer.h"
using namespace llvm;
namespace {
class AArch64WinCOFFStreamer : public MCWinCOFFStreamer {
Win64EH::ARM64UnwindEmitter EHStreamer;
public:
AArch64WinCOFFStreamer(MCContext &C, std::unique_ptr<MCAsmBackend> AB,
std::unique_ptr<MCCodeEmitter> CE,
std::unique_ptr<MCObjectWriter> OW)
: MCWinCOFFStreamer(C, std::move(AB), std::move(CE), std::move(OW)) {}
void EmitWinEHHandlerData(SMLoc Loc) override;
void EmitWindowsUnwindTables() override;
void FinishImpl() override;
};
void AArch64WinCOFFStreamer::EmitWinEHHandlerData(SMLoc Loc) {
MCStreamer::EmitWinEHHandlerData(Loc);
// We have to emit the unwind info now, because this directive
// actually switches to the .xdata section!
EHStreamer.EmitUnwindInfo(*this, getCurrentWinFrameInfo());
}
void AArch64WinCOFFStreamer::EmitWindowsUnwindTables() {
if (!getNumWinFrameInfos())
return;
EHStreamer.Emit(*this);
}
void AArch64WinCOFFStreamer::FinishImpl() {
EmitFrames(nullptr);
EmitWindowsUnwindTables();
MCWinCOFFStreamer::FinishImpl();
}
} // end anonymous namespace
namespace llvm {
// Helper function to common out unwind code setup for those codes that can
// belong to both prolog and epilog.
// There are three types of Windows ARM64 SEH codes. They can
// 1) take no operands: SEH_Nop, SEH_PrologEnd, SEH_EpilogStart, SEH_EpilogEnd
// 2) take an offset: SEH_StackAlloc, SEH_SaveFPLR, SEH_SaveFPLR_X
// 3) take a register and an offset/size: all others
void AArch64TargetWinCOFFStreamer::EmitARM64WinUnwindCode(unsigned UnwindCode,
int Reg,
int Offset) {
auto &S = getStreamer();
WinEH::FrameInfo *CurFrame = S.EnsureValidWinFrameInfo(SMLoc());
if (!CurFrame)
return;
MCSymbol *Label = S.EmitCFILabel();
auto Inst = WinEH::Instruction(UnwindCode, Label, Reg, Offset);
if (InEpilogCFI)
CurFrame->EpilogMap[CurrentEpilog].push_back(Inst);
else
CurFrame->Instructions.push_back(Inst);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFIAllocStack(unsigned Size) {
unsigned Op = Win64EH::UOP_AllocSmall;
if (Size >= 16384)
Op = Win64EH::UOP_AllocLarge;
else if (Size >= 512)
Op = Win64EH::UOP_AllocMedium;
EmitARM64WinUnwindCode(Op, -1, Size);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveFPLR(int Offset) {
EmitARM64WinUnwindCode(Win64EH::UOP_SaveFPLR, -1, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveFPLRX(int Offset) {
EmitARM64WinUnwindCode(Win64EH::UOP_SaveFPLRX, -1, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveReg(unsigned Reg,
int Offset) {
assert(Offset >= 0 && Offset <= 504 &&
"Offset for save reg should be >= 0 && <= 504");
EmitARM64WinUnwindCode(Win64EH::UOP_SaveReg, Reg, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveRegX(unsigned Reg,
int Offset) {
EmitARM64WinUnwindCode(Win64EH::UOP_SaveRegX, Reg, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveRegP(unsigned Reg,
int Offset) {
EmitARM64WinUnwindCode(Win64EH::UOP_SaveRegP, Reg, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveRegPX(unsigned Reg,
int Offset) {
EmitARM64WinUnwindCode(Win64EH::UOP_SaveRegPX, Reg, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveFReg(unsigned Reg,
int Offset) {
assert(Offset >= 0 && Offset <= 504 &&
"Offset for save reg should be >= 0 && <= 504");
EmitARM64WinUnwindCode(Win64EH::UOP_SaveFReg, Reg, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveFRegX(unsigned Reg,
int Offset) {
EmitARM64WinUnwindCode(Win64EH::UOP_SaveFRegX, Reg, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveFRegP(unsigned Reg,
int Offset) {
EmitARM64WinUnwindCode(Win64EH::UOP_SaveFRegP, Reg, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISaveFRegPX(unsigned Reg,
int Offset) {
EmitARM64WinUnwindCode(Win64EH::UOP_SaveFRegPX, Reg, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFISetFP() {
EmitARM64WinUnwindCode(Win64EH::UOP_SetFP, -1, 0);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFIAddFP(unsigned Offset) {
assert(Offset <= 2040 && "UOP_AddFP must have offset <= 2040");
EmitARM64WinUnwindCode(Win64EH::UOP_AddFP, -1, Offset);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFINop() {
EmitARM64WinUnwindCode(Win64EH::UOP_Nop, -1, 0);
}
// The functions below handle opcodes that can end up in either a prolog or
// an epilog, but not both.
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFIPrologEnd() {
auto &S = getStreamer();
WinEH::FrameInfo *CurFrame = S.EnsureValidWinFrameInfo(SMLoc());
if (!CurFrame)
return;
MCSymbol *Label = S.EmitCFILabel();
CurFrame->PrologEnd = Label;
WinEH::Instruction Inst = WinEH::Instruction(Win64EH::UOP_End, Label, -1, 0);
auto it = CurFrame->Instructions.begin();
CurFrame->Instructions.insert(it, Inst);
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFIEpilogStart() {
auto &S = getStreamer();
WinEH::FrameInfo *CurFrame = S.EnsureValidWinFrameInfo(SMLoc());
if (!CurFrame)
return;
InEpilogCFI = true;
CurrentEpilog = S.EmitCFILabel();
}
void AArch64TargetWinCOFFStreamer::EmitARM64WinCFIEpilogEnd() {
auto &S = getStreamer();
WinEH::FrameInfo *CurFrame = S.EnsureValidWinFrameInfo(SMLoc());
if (!CurFrame)
return;
InEpilogCFI = false;
MCSymbol *Label = S.EmitCFILabel();
WinEH::Instruction Inst = WinEH::Instruction(Win64EH::UOP_End, Label, -1, 0);
CurFrame->EpilogMap[CurrentEpilog].push_back(Inst);
CurrentEpilog = nullptr;
}
MCWinCOFFStreamer *createAArch64WinCOFFStreamer(
MCContext &Context, std::unique_ptr<MCAsmBackend> MAB,
std::unique_ptr<MCObjectWriter> OW, std::unique_ptr<MCCodeEmitter> Emitter,
bool RelaxAll, bool IncrementalLinkerCompatible) {
auto *S = new AArch64WinCOFFStreamer(Context, std::move(MAB),
std::move(Emitter), std::move(OW));
S->getAssembler().setIncrementalLinkerCompatible(IncrementalLinkerCompatible);
return S;
}
} // end llvm namespace
|
