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
|
//===-- X86MachORelocationInfo.cpp ----------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/X86MCTargetDesc.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCRelocationInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Object/MachO.h"
using namespace llvm;
using namespace object;
using namespace MachO;
namespace {
class X86_64MachORelocationInfo : public MCRelocationInfo {
public:
X86_64MachORelocationInfo(MCContext &Ctx) : MCRelocationInfo(Ctx) {}
const MCExpr *createExprForRelocation(RelocationRef Rel) override {
const MachOObjectFile *Obj = cast<MachOObjectFile>(Rel.getObjectFile());
uint64_t RelType; Rel.getType(RelType);
symbol_iterator SymI = Rel.getSymbol();
StringRef SymName; SymI->getName(SymName);
uint64_t SymAddr; SymI->getAddress(SymAddr);
any_relocation_info RE = Obj->getRelocation(Rel.getRawDataRefImpl());
bool isPCRel = Obj->getAnyRelocationPCRel(RE);
MCSymbol *Sym = Ctx.GetOrCreateSymbol(SymName);
// FIXME: check that the value is actually the same.
if (!Sym->isVariable())
Sym->setVariableValue(MCConstantExpr::Create(SymAddr, Ctx));
const MCExpr *Expr = nullptr;
switch(RelType) {
case X86_64_RELOC_TLV:
Expr = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_TLVP, Ctx);
break;
case X86_64_RELOC_SIGNED_4:
Expr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Sym, Ctx),
MCConstantExpr::Create(4, Ctx),
Ctx);
break;
case X86_64_RELOC_SIGNED_2:
Expr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Sym, Ctx),
MCConstantExpr::Create(2, Ctx),
Ctx);
break;
case X86_64_RELOC_SIGNED_1:
Expr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(Sym, Ctx),
MCConstantExpr::Create(1, Ctx),
Ctx);
break;
case X86_64_RELOC_GOT_LOAD:
Expr = MCSymbolRefExpr::Create(Sym, MCSymbolRefExpr::VK_GOTPCREL, Ctx);
break;
case X86_64_RELOC_GOT:
Expr = MCSymbolRefExpr::Create(Sym, isPCRel ?
MCSymbolRefExpr::VK_GOTPCREL :
MCSymbolRefExpr::VK_GOT,
Ctx);
break;
case X86_64_RELOC_SUBTRACTOR:
{
Rel.moveNext();
any_relocation_info RENext =
Obj->getRelocation(Rel.getRawDataRefImpl());
// X86_64_SUBTRACTOR must be followed by a relocation of type
// X86_64_RELOC_UNSIGNED.
// NOTE: Scattered relocations don't exist on x86_64.
unsigned RType = Obj->getAnyRelocationType(RENext);
if (RType != X86_64_RELOC_UNSIGNED)
report_fatal_error("Expected X86_64_RELOC_UNSIGNED after "
"X86_64_RELOC_SUBTRACTOR.");
const MCExpr *LHS = MCSymbolRefExpr::Create(Sym, Ctx);
symbol_iterator RSymI = Rel.getSymbol();
uint64_t RSymAddr;
RSymI->getAddress(RSymAddr);
StringRef RSymName;
RSymI->getName(RSymName);
MCSymbol *RSym = Ctx.GetOrCreateSymbol(RSymName);
if (!RSym->isVariable())
RSym->setVariableValue(MCConstantExpr::Create(RSymAddr, Ctx));
const MCExpr *RHS = MCSymbolRefExpr::Create(RSym, Ctx);
Expr = MCBinaryExpr::CreateSub(LHS, RHS, Ctx);
break;
}
default:
Expr = MCSymbolRefExpr::Create(Sym, Ctx);
break;
}
return Expr;
}
};
} // End unnamed namespace
/// createX86_64MachORelocationInfo - Construct an X86-64 Mach-O RelocationInfo.
MCRelocationInfo *llvm::createX86_64MachORelocationInfo(MCContext &Ctx) {
return new X86_64MachORelocationInfo(Ctx);
}
|
