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
|
//===-- llvm/Target/ARMTargetObjectFile.cpp - ARM Object Info Impl --------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "ARMTargetObjectFile.h"
#include "ARMSubtarget.h"
#include "ARMTargetMachine.h"
#include "llvm/BinaryFormat/Dwarf.h"
#include "llvm/BinaryFormat/ELF.h"
#include "llvm/MC/MCAsmInfo.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCSectionELF.h"
#include "llvm/MC/MCTargetOptions.h"
#include "llvm/MC/SectionKind.h"
#include "llvm/Target/TargetMachine.h"
#include <cassert>
using namespace llvm;
using namespace dwarf;
//===----------------------------------------------------------------------===//
// ELF Target
//===----------------------------------------------------------------------===//
void ARMElfTargetObjectFile::Initialize(MCContext &Ctx,
const TargetMachine &TM) {
const ARMBaseTargetMachine &ARM_TM = static_cast<const ARMBaseTargetMachine &>(TM);
bool isAAPCS_ABI = ARM_TM.TargetABI == ARMBaseTargetMachine::ARMABI::ARM_ABI_AAPCS;
// genExecuteOnly = ARM_TM.getSubtargetImpl()->genExecuteOnly();
TargetLoweringObjectFileELF::Initialize(Ctx, TM);
InitializeELF(isAAPCS_ABI);
if (isAAPCS_ABI) {
LSDASection = nullptr;
}
AttributesSection =
getContext().getELFSection(".ARM.attributes", ELF::SHT_ARM_ATTRIBUTES, 0);
}
const MCExpr *ARMElfTargetObjectFile::getTTypeGlobalReference(
const GlobalValue *GV, unsigned Encoding, const TargetMachine &TM,
MachineModuleInfo *MMI, MCStreamer &Streamer) const {
if (TM.getMCAsmInfo()->getExceptionHandlingType() != ExceptionHandling::ARM)
return TargetLoweringObjectFileELF::getTTypeGlobalReference(
GV, Encoding, TM, MMI, Streamer);
assert(Encoding == DW_EH_PE_absptr && "Can handle absptr encoding only");
return MCSymbolRefExpr::create(TM.getSymbol(GV),
MCSymbolRefExpr::VK_ARM_TARGET2, getContext());
}
const MCExpr *ARMElfTargetObjectFile::
getDebugThreadLocalSymbol(const MCSymbol *Sym) const {
return MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_ARM_TLSLDO,
getContext());
}
static bool isExecuteOnlyFunction(const GlobalObject *GO, SectionKind SK,
const TargetMachine &TM) {
if (const Function *F = dyn_cast<Function>(GO))
if (TM.getSubtarget<ARMSubtarget>(*F).genExecuteOnly() && SK.isText())
return true;
return false;
}
MCSection *ARMElfTargetObjectFile::getExplicitSectionGlobal(
const GlobalObject *GO, SectionKind SK, const TargetMachine &TM) const {
// Set execute-only access for the explicit section
if (isExecuteOnlyFunction(GO, SK, TM))
SK = SectionKind::getExecuteOnly();
return TargetLoweringObjectFileELF::getExplicitSectionGlobal(GO, SK, TM);
}
MCSection *ARMElfTargetObjectFile::SelectSectionForGlobal(
const GlobalObject *GO, SectionKind SK, const TargetMachine &TM) const {
// Place the global in the execute-only text section
if (isExecuteOnlyFunction(GO, SK, TM))
SK = SectionKind::getExecuteOnly();
return TargetLoweringObjectFileELF::SelectSectionForGlobal(GO, SK, TM);
}
|
