1 //===- ELFObjectFile.cpp - ELF object file implementation -----------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Part of the ELFObjectFile class implementation.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/ADT/Triple.h"
15 #include "llvm/MC/SubtargetFeature.h"
16 #include "llvm/Object/ELF.h"
17 #include "llvm/Object/ELFObjectFile.h"
18 #include "llvm/Object/ELFTypes.h"
19 #include "llvm/Object/Error.h"
20 #include "llvm/Support/ARMBuildAttributes.h"
21 #include "llvm/Support/ARMAttributeParser.h"
22 #include "llvm/Support/ELF.h"
23 #include "llvm/Support/Endian.h"
24 #include "llvm/Support/ErrorHandling.h"
25 #include "llvm/Support/MathExtras.h"
31 #include <system_error>
35 using namespace object;
37 ELFObjectFileBase::ELFObjectFileBase(unsigned int Type, MemoryBufferRef Source)
38 : ObjectFile(Type, Source) {}
40 ErrorOr<std::unique_ptr<ObjectFile>>
41 ObjectFile::createELFObjectFile(MemoryBufferRef Obj) {
42 std::pair<unsigned char, unsigned char> Ident =
43 getElfArchType(Obj.getBuffer());
44 std::size_t MaxAlignment =
45 1ULL << countTrailingZeros(uintptr_t(Obj.getBufferStart()));
48 return object_error::parse_failed;
51 std::unique_ptr<ObjectFile> R;
52 if (Ident.first == ELF::ELFCLASS32) {
53 if (Ident.second == ELF::ELFDATA2LSB)
54 R.reset(new ELFObjectFile<ELFType<support::little, false>>(Obj, EC));
55 else if (Ident.second == ELF::ELFDATA2MSB)
56 R.reset(new ELFObjectFile<ELFType<support::big, false>>(Obj, EC));
58 return object_error::parse_failed;
59 } else if (Ident.first == ELF::ELFCLASS64) {
60 if (Ident.second == ELF::ELFDATA2LSB)
61 R.reset(new ELFObjectFile<ELFType<support::little, true>>(Obj, EC));
62 else if (Ident.second == ELF::ELFDATA2MSB)
63 R.reset(new ELFObjectFile<ELFType<support::big, true>>(Obj, EC));
65 return object_error::parse_failed;
67 return object_error::parse_failed;
75 SubtargetFeatures ELFObjectFileBase::getMIPSFeatures() const {
76 SubtargetFeatures Features;
77 unsigned PlatformFlags;
78 getPlatformFlags(PlatformFlags);
80 switch (PlatformFlags & ELF::EF_MIPS_ARCH) {
81 case ELF::EF_MIPS_ARCH_1:
83 case ELF::EF_MIPS_ARCH_2:
84 Features.AddFeature("mips2");
86 case ELF::EF_MIPS_ARCH_3:
87 Features.AddFeature("mips3");
89 case ELF::EF_MIPS_ARCH_4:
90 Features.AddFeature("mips4");
92 case ELF::EF_MIPS_ARCH_5:
93 Features.AddFeature("mips5");
95 case ELF::EF_MIPS_ARCH_32:
96 Features.AddFeature("mips32");
98 case ELF::EF_MIPS_ARCH_64:
99 Features.AddFeature("mips64");
101 case ELF::EF_MIPS_ARCH_32R2:
102 Features.AddFeature("mips32r2");
104 case ELF::EF_MIPS_ARCH_64R2:
105 Features.AddFeature("mips64r2");
107 case ELF::EF_MIPS_ARCH_32R6:
108 Features.AddFeature("mips32r6");
110 case ELF::EF_MIPS_ARCH_64R6:
111 Features.AddFeature("mips64r6");
114 llvm_unreachable("Unknown EF_MIPS_ARCH value");
117 switch (PlatformFlags & ELF::EF_MIPS_MACH) {
118 case ELF::EF_MIPS_MACH_NONE:
119 // No feature associated with this value.
121 case ELF::EF_MIPS_MACH_OCTEON:
122 Features.AddFeature("cnmips");
125 llvm_unreachable("Unknown EF_MIPS_ARCH value");
128 if (PlatformFlags & ELF::EF_MIPS_ARCH_ASE_M16)
129 Features.AddFeature("mips16");
130 if (PlatformFlags & ELF::EF_MIPS_MICROMIPS)
131 Features.AddFeature("micromips");
136 SubtargetFeatures ELFObjectFileBase::getARMFeatures() const {
137 SubtargetFeatures Features;
138 ARMAttributeParser Attributes;
139 std::error_code EC = getBuildAttributes(Attributes);
141 return SubtargetFeatures();
143 // both ARMv7-M and R have to support thumb hardware div
145 if (Attributes.hasAttribute(ARMBuildAttrs::CPU_arch))
146 isV7 = Attributes.getAttributeValue(ARMBuildAttrs::CPU_arch)
147 == ARMBuildAttrs::v7;
149 if (Attributes.hasAttribute(ARMBuildAttrs::CPU_arch_profile)) {
150 switch(Attributes.getAttributeValue(ARMBuildAttrs::CPU_arch_profile)) {
151 case ARMBuildAttrs::ApplicationProfile:
152 Features.AddFeature("aclass");
154 case ARMBuildAttrs::RealTimeProfile:
155 Features.AddFeature("rclass");
157 Features.AddFeature("hwdiv");
159 case ARMBuildAttrs::MicroControllerProfile:
160 Features.AddFeature("mclass");
162 Features.AddFeature("hwdiv");
167 if (Attributes.hasAttribute(ARMBuildAttrs::THUMB_ISA_use)) {
168 switch(Attributes.getAttributeValue(ARMBuildAttrs::THUMB_ISA_use)) {
171 case ARMBuildAttrs::Not_Allowed:
172 Features.AddFeature("thumb", false);
173 Features.AddFeature("thumb2", false);
175 case ARMBuildAttrs::AllowThumb32:
176 Features.AddFeature("thumb2");
181 if (Attributes.hasAttribute(ARMBuildAttrs::FP_arch)) {
182 switch(Attributes.getAttributeValue(ARMBuildAttrs::FP_arch)) {
185 case ARMBuildAttrs::Not_Allowed:
186 Features.AddFeature("vfp2", false);
187 Features.AddFeature("vfp3", false);
188 Features.AddFeature("vfp4", false);
190 case ARMBuildAttrs::AllowFPv2:
191 Features.AddFeature("vfp2");
193 case ARMBuildAttrs::AllowFPv3A:
194 case ARMBuildAttrs::AllowFPv3B:
195 Features.AddFeature("vfp3");
197 case ARMBuildAttrs::AllowFPv4A:
198 case ARMBuildAttrs::AllowFPv4B:
199 Features.AddFeature("vfp4");
204 if (Attributes.hasAttribute(ARMBuildAttrs::Advanced_SIMD_arch)) {
205 switch(Attributes.getAttributeValue(ARMBuildAttrs::Advanced_SIMD_arch)) {
208 case ARMBuildAttrs::Not_Allowed:
209 Features.AddFeature("neon", false);
210 Features.AddFeature("fp16", false);
212 case ARMBuildAttrs::AllowNeon:
213 Features.AddFeature("neon");
215 case ARMBuildAttrs::AllowNeon2:
216 Features.AddFeature("neon");
217 Features.AddFeature("fp16");
222 if (Attributes.hasAttribute(ARMBuildAttrs::DIV_use)) {
223 switch(Attributes.getAttributeValue(ARMBuildAttrs::DIV_use)) {
226 case ARMBuildAttrs::DisallowDIV:
227 Features.AddFeature("hwdiv", false);
228 Features.AddFeature("hwdiv-arm", false);
230 case ARMBuildAttrs::AllowDIVExt:
231 Features.AddFeature("hwdiv");
232 Features.AddFeature("hwdiv-arm");
240 SubtargetFeatures ELFObjectFileBase::getFeatures() const {
241 switch (getEMachine()) {
243 return getMIPSFeatures();
245 return getARMFeatures();
247 return SubtargetFeatures();
251 // FIXME Encode from a tablegen description or target parser.
252 void ELFObjectFileBase::setARMSubArch(Triple &TheTriple) const {
253 if (TheTriple.getSubArch() != Triple::NoSubArch)
256 ARMAttributeParser Attributes;
257 std::error_code EC = getBuildAttributes(Attributes);
262 // Default to ARM, but use the triple if it's been set.
263 if (TheTriple.getArch() == Triple::thumb ||
264 TheTriple.getArch() == Triple::thumbeb)
269 if (Attributes.hasAttribute(ARMBuildAttrs::CPU_arch)) {
270 switch(Attributes.getAttributeValue(ARMBuildAttrs::CPU_arch)) {
271 case ARMBuildAttrs::v4:
274 case ARMBuildAttrs::v4T:
277 case ARMBuildAttrs::v5T:
280 case ARMBuildAttrs::v5TE:
283 case ARMBuildAttrs::v5TEJ:
286 case ARMBuildAttrs::v6:
289 case ARMBuildAttrs::v6KZ:
292 case ARMBuildAttrs::v6T2:
295 case ARMBuildAttrs::v6K:
298 case ARMBuildAttrs::v7:
301 case ARMBuildAttrs::v6_M:
304 case ARMBuildAttrs::v6S_M:
307 case ARMBuildAttrs::v7E_M:
312 if (!isLittleEndian())
315 TheTriple.setArchName(Triple);