1//===-- PPCAsmBackend.cpp - PPC Assembler Backend -------------------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "MCTargetDesc/PPCMCTargetDesc.h"
11#include "MCTargetDesc/PPCFixupKinds.h"
12#include "llvm/MC/MCAsmBackend.h"
13#include "llvm/MC/MCELFObjectWriter.h"
14#include "llvm/MC/MCFixupKindInfo.h"
15#include "llvm/MC/MCMachObjectWriter.h"
16#include "llvm/MC/MCSectionMachO.h"
17#include "llvm/MC/MCObjectWriter.h"
18#include "llvm/MC/MCValue.h"
19#include "llvm/Object/MachOFormat.h"
20#include "llvm/Support/ELF.h"
21#include "llvm/Support/ErrorHandling.h"
22#include "llvm/Support/TargetRegistry.h"
23using namespace llvm;
24
25static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
26 switch (Kind) {
27 default:
28 llvm_unreachable("Unknown fixup kind!");
29 case FK_Data_1:
30 case FK_Data_2:
31 case FK_Data_4:
32 return Value;
33 case PPC::fixup_ppc_brcond14:
34 return Value & 0x3ffc;
35 case PPC::fixup_ppc_br24:
36 return Value & 0x3fffffc;
37#if 0
38 case PPC::fixup_ppc_hi16:
39 return (Value >> 16) & 0xffff;
40#endif
41 case PPC::fixup_ppc_ha16:
42 return ((Value >> 16) + ((Value & 0x8000) ? 1 : 0)) & 0xffff;
43 case PPC::fixup_ppc_lo16:
44 return Value & 0xffff;
45 }
46}
47
48namespace {
49class PPCMachObjectWriter : public MCMachObjectTargetWriter {
50public:
51 PPCMachObjectWriter(bool Is64Bit, uint32_t CPUType,
52 uint32_t CPUSubtype)
53 : MCMachObjectTargetWriter(Is64Bit, CPUType, CPUSubtype) {}
54
55 void RecordRelocation(MachObjectWriter *Writer,
56 const MCAssembler &Asm, const MCAsmLayout &Layout,
57 const MCFragment *Fragment, const MCFixup &Fixup,
58 MCValue Target, uint64_t &FixedValue) {}
59};
60
61class PPCAsmBackend : public MCAsmBackend {
62const Target &TheTarget;
63public:
64 PPCAsmBackend(const Target &T) : MCAsmBackend(), TheTarget(T) {}
65
66 unsigned getNumFixupKinds() const { return PPC::NumTargetFixupKinds; }
67
68 const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const {
69 const static MCFixupKindInfo Infos[PPC::NumTargetFixupKinds] = {
70 // name offset bits flags
71 { "fixup_ppc_br24", 6, 24, MCFixupKindInfo::FKF_IsPCRel },
72 { "fixup_ppc_brcond14", 16, 14, MCFixupKindInfo::FKF_IsPCRel },
73 { "fixup_ppc_lo16", 16, 16, 0 },
74 { "fixup_ppc_ha16", 16, 16, 0 },
75 { "fixup_ppc_lo14", 16, 14, 0 }
76 };
77
78 if (Kind < FirstTargetFixupKind)
79 return MCAsmBackend::getFixupKindInfo(Kind);
80
81 assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
82 "Invalid kind!");
83 return Infos[Kind - FirstTargetFixupKind];
84 }
85
86 bool mayNeedRelaxation(const MCInst &Inst) const {
87 // FIXME.
88 return false;
89 }
90
91 bool fixupNeedsRelaxation(const MCFixup &Fixup,
92 uint64_t Value,
93 const MCInstFragment *DF,
94 const MCAsmLayout &Layout) const {
95 // FIXME.
96 llvm_unreachable("relaxInstruction() unimplemented");
97 }
98
99
100 void relaxInstruction(const MCInst &Inst, MCInst &Res) const {
101 // FIXME.
102 llvm_unreachable("relaxInstruction() unimplemented");
103 }
104
105 bool writeNopData(uint64_t Count, MCObjectWriter *OW) const {
106 // FIXME: Zero fill for now. That's not right, but at least will get the
107 // section size right.
108 for (uint64_t i = 0; i != Count; ++i)
109 OW->Write8(0);
110 return true;
111 }
112
113 unsigned getPointerSize() const {
114 StringRef Name = TheTarget.getName();
115 if (Name == "ppc64") return 8;
116 assert(Name == "ppc32" && "Unknown target name!");
117 return 4;
118 }
119};
120} // end anonymous namespace
121
122
123// FIXME: This should be in a separate file.
124namespace {
125 class DarwinPPCAsmBackend : public PPCAsmBackend {
126 public:
127 DarwinPPCAsmBackend(const Target &T) : PPCAsmBackend(T) { }
128
129 void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
130 uint64_t Value) const {
131 llvm_unreachable("UNIMP");
132 }
133
134 MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
135 bool is64 = getPointerSize() == 8;
136 return createMachObjectWriter(new PPCMachObjectWriter(
137 /*Is64Bit=*/is64,
138 (is64 ? object::mach::CTM_PowerPC64 :
139 object::mach::CTM_PowerPC),
140 object::mach::CSPPC_ALL),
141 OS, /*IsLittleEndian=*/false);
142 }
143
144 virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
145 return false;
146 }
147 };
148
149 class ELFPPCAsmBackend : public PPCAsmBackend {
150 uint8_t OSABI;
151 public:
152 ELFPPCAsmBackend(const Target &T, uint8_t OSABI) :
153 PPCAsmBackend(T), OSABI(OSABI) { }
154
155 void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
156 uint64_t Value) const {
157 Value = adjustFixupValue(Fixup.getKind(), Value);
158 if (!Value) return; // Doesn't change encoding.
159
160 unsigned Offset = Fixup.getOffset();
161
162 // For each byte of the fragment that the fixup touches, mask in the bits from
163 // the fixup value. The Value has been "split up" into the appropriate
164 // bitfields above.
165 for (unsigned i = 0; i != 4; ++i)
166 Data[Offset + i] |= uint8_t((Value >> ((4 - i - 1)*8)) & 0xff);
167 }
168
169 MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
170 bool is64 = getPointerSize() == 8;
171 return createPPCELFObjectWriter(OS, is64, OSABI);
172 }
173
174 virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
175 return false;
176 }
177 };
178
179} // end anonymous namespace
180
181
182
183
| 1//===-- PPCAsmBackend.cpp - PPC Assembler Backend -------------------------===//
2//
3// The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. See LICENSE.TXT for details.
7//
8//===----------------------------------------------------------------------===//
9
10#include "MCTargetDesc/PPCMCTargetDesc.h"
11#include "MCTargetDesc/PPCFixupKinds.h"
12#include "llvm/MC/MCAsmBackend.h"
13#include "llvm/MC/MCELFObjectWriter.h"
14#include "llvm/MC/MCFixupKindInfo.h"
15#include "llvm/MC/MCMachObjectWriter.h"
16#include "llvm/MC/MCSectionMachO.h"
17#include "llvm/MC/MCObjectWriter.h"
18#include "llvm/MC/MCValue.h"
19#include "llvm/Object/MachOFormat.h"
20#include "llvm/Support/ELF.h"
21#include "llvm/Support/ErrorHandling.h"
22#include "llvm/Support/TargetRegistry.h"
23using namespace llvm;
24
25static unsigned adjustFixupValue(unsigned Kind, uint64_t Value) {
26 switch (Kind) {
27 default:
28 llvm_unreachable("Unknown fixup kind!");
29 case FK_Data_1:
30 case FK_Data_2:
31 case FK_Data_4:
32 return Value;
33 case PPC::fixup_ppc_brcond14:
34 return Value & 0x3ffc;
35 case PPC::fixup_ppc_br24:
36 return Value & 0x3fffffc;
37#if 0
38 case PPC::fixup_ppc_hi16:
39 return (Value >> 16) & 0xffff;
40#endif
41 case PPC::fixup_ppc_ha16:
42 return ((Value >> 16) + ((Value & 0x8000) ? 1 : 0)) & 0xffff;
43 case PPC::fixup_ppc_lo16:
44 return Value & 0xffff;
45 }
46}
47
48namespace {
49class PPCMachObjectWriter : public MCMachObjectTargetWriter {
50public:
51 PPCMachObjectWriter(bool Is64Bit, uint32_t CPUType,
52 uint32_t CPUSubtype)
53 : MCMachObjectTargetWriter(Is64Bit, CPUType, CPUSubtype) {}
54
55 void RecordRelocation(MachObjectWriter *Writer,
56 const MCAssembler &Asm, const MCAsmLayout &Layout,
57 const MCFragment *Fragment, const MCFixup &Fixup,
58 MCValue Target, uint64_t &FixedValue) {}
59};
60
61class PPCAsmBackend : public MCAsmBackend {
62const Target &TheTarget;
63public:
64 PPCAsmBackend(const Target &T) : MCAsmBackend(), TheTarget(T) {}
65
66 unsigned getNumFixupKinds() const { return PPC::NumTargetFixupKinds; }
67
68 const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const {
69 const static MCFixupKindInfo Infos[PPC::NumTargetFixupKinds] = {
70 // name offset bits flags
71 { "fixup_ppc_br24", 6, 24, MCFixupKindInfo::FKF_IsPCRel },
72 { "fixup_ppc_brcond14", 16, 14, MCFixupKindInfo::FKF_IsPCRel },
73 { "fixup_ppc_lo16", 16, 16, 0 },
74 { "fixup_ppc_ha16", 16, 16, 0 },
75 { "fixup_ppc_lo14", 16, 14, 0 }
76 };
77
78 if (Kind < FirstTargetFixupKind)
79 return MCAsmBackend::getFixupKindInfo(Kind);
80
81 assert(unsigned(Kind - FirstTargetFixupKind) < getNumFixupKinds() &&
82 "Invalid kind!");
83 return Infos[Kind - FirstTargetFixupKind];
84 }
85
86 bool mayNeedRelaxation(const MCInst &Inst) const {
87 // FIXME.
88 return false;
89 }
90
91 bool fixupNeedsRelaxation(const MCFixup &Fixup,
92 uint64_t Value,
93 const MCInstFragment *DF,
94 const MCAsmLayout &Layout) const {
95 // FIXME.
96 llvm_unreachable("relaxInstruction() unimplemented");
97 }
98
99
100 void relaxInstruction(const MCInst &Inst, MCInst &Res) const {
101 // FIXME.
102 llvm_unreachable("relaxInstruction() unimplemented");
103 }
104
105 bool writeNopData(uint64_t Count, MCObjectWriter *OW) const {
106 // FIXME: Zero fill for now. That's not right, but at least will get the
107 // section size right.
108 for (uint64_t i = 0; i != Count; ++i)
109 OW->Write8(0);
110 return true;
111 }
112
113 unsigned getPointerSize() const {
114 StringRef Name = TheTarget.getName();
115 if (Name == "ppc64") return 8;
116 assert(Name == "ppc32" && "Unknown target name!");
117 return 4;
118 }
119};
120} // end anonymous namespace
121
122
123// FIXME: This should be in a separate file.
124namespace {
125 class DarwinPPCAsmBackend : public PPCAsmBackend {
126 public:
127 DarwinPPCAsmBackend(const Target &T) : PPCAsmBackend(T) { }
128
129 void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
130 uint64_t Value) const {
131 llvm_unreachable("UNIMP");
132 }
133
134 MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
135 bool is64 = getPointerSize() == 8;
136 return createMachObjectWriter(new PPCMachObjectWriter(
137 /*Is64Bit=*/is64,
138 (is64 ? object::mach::CTM_PowerPC64 :
139 object::mach::CTM_PowerPC),
140 object::mach::CSPPC_ALL),
141 OS, /*IsLittleEndian=*/false);
142 }
143
144 virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
145 return false;
146 }
147 };
148
149 class ELFPPCAsmBackend : public PPCAsmBackend {
150 uint8_t OSABI;
151 public:
152 ELFPPCAsmBackend(const Target &T, uint8_t OSABI) :
153 PPCAsmBackend(T), OSABI(OSABI) { }
154
155 void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
156 uint64_t Value) const {
157 Value = adjustFixupValue(Fixup.getKind(), Value);
158 if (!Value) return; // Doesn't change encoding.
159
160 unsigned Offset = Fixup.getOffset();
161
162 // For each byte of the fragment that the fixup touches, mask in the bits from
163 // the fixup value. The Value has been "split up" into the appropriate
164 // bitfields above.
165 for (unsigned i = 0; i != 4; ++i)
166 Data[Offset + i] |= uint8_t((Value >> ((4 - i - 1)*8)) & 0xff);
167 }
168
169 MCObjectWriter *createObjectWriter(raw_ostream &OS) const {
170 bool is64 = getPointerSize() == 8;
171 return createPPCELFObjectWriter(OS, is64, OSABI);
172 }
173
174 virtual bool doesSectionRequireSymbols(const MCSection &Section) const {
175 return false;
176 }
177 };
178
179} // end anonymous namespace
180
181
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