1 /*
2 * Copyright (C) 2019-2021 Intel Corporation
3 *
4 * SPDX-License-Identifier: MIT
5 *
6 */
7
8 #include "shared/source/compiler_interface/linker.h"
9
10 #include "shared/source/command_stream/command_stream_receiver.h"
11 #include "shared/source/compiler_interface/linker.inl"
12 #include "shared/source/device/device.h"
13 #include "shared/source/device_binary_format/elf/zebin_elf.h"
14 #include "shared/source/helpers/blit_commands_helper.h"
15 #include "shared/source/helpers/debug_helpers.h"
16 #include "shared/source/helpers/hw_helper.h"
17 #include "shared/source/helpers/ptr_math.h"
18 #include "shared/source/kernel/implicit_args.h"
19 #include "shared/source/kernel/kernel_descriptor.h"
20 #include "shared/source/memory_manager/graphics_allocation.h"
21 #include "shared/source/memory_manager/memory_manager.h"
22
23 #include "RelocationInfo.h"
24
25 #include <sstream>
26
27 namespace NEO {
28
getSegmentForSection(ConstStringRef name)29 SegmentType LinkerInput::getSegmentForSection(ConstStringRef name) {
30 if (name == NEO::Elf::SectionsNamesZebin::dataConst || name == NEO::Elf::SectionsNamesZebin::dataGlobalConst) {
31 return NEO::SegmentType::GlobalConstants;
32 } else if (name == NEO::Elf::SectionsNamesZebin::dataGlobal) {
33 return NEO::SegmentType::GlobalVariables;
34 } else if (name == NEO::Elf::SectionsNamesZebin::dataConstString) {
35 return NEO::SegmentType::GlobalStrings;
36 } else if (name.startsWith(NEO::Elf::SpecialSectionNames::text.data())) {
37 return NEO::SegmentType::Instructions;
38 }
39 return NEO::SegmentType::Unknown;
40 }
41
decodeGlobalVariablesSymbolTable(const void * data,uint32_t numEntries)42 bool LinkerInput::decodeGlobalVariablesSymbolTable(const void *data, uint32_t numEntries) {
43 auto symbolEntryIt = reinterpret_cast<const vISA::GenSymEntry *>(data);
44 auto symbolEntryEnd = symbolEntryIt + numEntries;
45 symbols.reserve(symbols.size() + numEntries);
46 for (; symbolEntryIt != symbolEntryEnd; ++symbolEntryIt) {
47 DEBUG_BREAK_IF(symbols.count(symbolEntryIt->s_name) > 0);
48 SymbolInfo &symbolInfo = symbols[symbolEntryIt->s_name];
49 symbolInfo.offset = symbolEntryIt->s_offset;
50 symbolInfo.size = symbolEntryIt->s_size;
51 switch (symbolEntryIt->s_type) {
52 default:
53 DEBUG_BREAK_IF(true);
54 this->valid = false;
55 return false;
56 case vISA::S_GLOBAL_VAR:
57 symbolInfo.segment = SegmentType::GlobalVariables;
58 traits.exportsGlobalVariables = true;
59 break;
60 case vISA::S_GLOBAL_VAR_CONST:
61 symbolInfo.segment = SegmentType::GlobalConstants;
62 traits.exportsGlobalConstants = true;
63 break;
64 }
65 }
66 return true;
67 }
68
decodeExportedFunctionsSymbolTable(const void * data,uint32_t numEntries,uint32_t instructionsSegmentId)69 bool LinkerInput::decodeExportedFunctionsSymbolTable(const void *data, uint32_t numEntries, uint32_t instructionsSegmentId) {
70 auto symbolEntryIt = reinterpret_cast<const vISA::GenSymEntry *>(data);
71 auto symbolEntryEnd = symbolEntryIt + numEntries;
72 symbols.reserve(symbols.size() + numEntries);
73 for (; symbolEntryIt != symbolEntryEnd; ++symbolEntryIt) {
74 SymbolInfo &symbolInfo = symbols[symbolEntryIt->s_name];
75 symbolInfo.offset = symbolEntryIt->s_offset;
76 symbolInfo.size = symbolEntryIt->s_size;
77 switch (symbolEntryIt->s_type) {
78 default:
79 DEBUG_BREAK_IF(true);
80 this->valid = false;
81 return false;
82 case vISA::S_UNDEF:
83 if (this->undefinedSymbolsAllowed) {
84 symbols.erase(symbolEntryIt->s_name);
85 break;
86 } else {
87 DEBUG_BREAK_IF(true);
88 this->valid = false;
89 return false;
90 }
91 case vISA::S_GLOBAL_VAR:
92 symbolInfo.segment = SegmentType::GlobalVariables;
93 traits.exportsGlobalVariables = true;
94 break;
95 case vISA::S_GLOBAL_VAR_CONST:
96 symbolInfo.segment = SegmentType::GlobalConstants;
97 traits.exportsGlobalConstants = true;
98 break;
99 case vISA::S_FUNC:
100 symbolInfo.segment = SegmentType::Instructions;
101 traits.exportsFunctions = true;
102 UNRECOVERABLE_IF((this->exportedFunctionsSegmentId != -1) && (this->exportedFunctionsSegmentId != static_cast<int32_t>(instructionsSegmentId)));
103 this->exportedFunctionsSegmentId = static_cast<int32_t>(instructionsSegmentId);
104 break;
105 }
106 }
107 return true;
108 }
109
decodeRelocationTable(const void * data,uint32_t numEntries,uint32_t instructionsSegmentId)110 bool LinkerInput::decodeRelocationTable(const void *data, uint32_t numEntries, uint32_t instructionsSegmentId) {
111 this->traits.requiresPatchingOfInstructionSegments = true;
112 auto relocEntryIt = reinterpret_cast<const vISA::GenRelocEntry *>(data);
113 auto relocEntryEnd = relocEntryIt + numEntries;
114 if (instructionsSegmentId >= relocations.size()) {
115 static_assert(std::is_nothrow_move_constructible<decltype(relocations[0])>::value, "");
116 relocations.resize(instructionsSegmentId + 1);
117 }
118
119 auto &outRelocInfo = relocations[instructionsSegmentId];
120 outRelocInfo.reserve(numEntries);
121 for (; relocEntryIt != relocEntryEnd; ++relocEntryIt) {
122 RelocationInfo relocInfo{};
123 relocInfo.offset = relocEntryIt->r_offset;
124 relocInfo.symbolName = relocEntryIt->r_symbol;
125 relocInfo.relocationSegment = SegmentType::Instructions;
126 switch (relocEntryIt->r_type) {
127 default:
128 DEBUG_BREAK_IF(true);
129 this->valid = false;
130 return false;
131 case vISA::R_SYM_ADDR:
132 relocInfo.type = RelocationInfo::Type::Address;
133 break;
134 case vISA::R_SYM_ADDR_32:
135 relocInfo.type = RelocationInfo::Type::AddressLow;
136 break;
137 case vISA::R_SYM_ADDR_32_HI:
138 relocInfo.type = RelocationInfo::Type::AddressHigh;
139 break;
140 case vISA::R_PER_THREAD_PAYLOAD_OFFSET_32:
141 relocInfo.type = RelocationInfo::Type::PerThreadPayloadOffset;
142 break;
143 }
144 outRelocInfo.push_back(std::move(relocInfo));
145 }
146 return true;
147 }
148
addDataRelocationInfo(const RelocationInfo & relocationInfo)149 void LinkerInput::addDataRelocationInfo(const RelocationInfo &relocationInfo) {
150 DEBUG_BREAK_IF((relocationInfo.relocationSegment != SegmentType::GlobalConstants) && (relocationInfo.relocationSegment != SegmentType::GlobalVariables));
151 this->traits.requiresPatchingOfGlobalVariablesBuffer |= (relocationInfo.relocationSegment == SegmentType::GlobalVariables);
152 this->traits.requiresPatchingOfGlobalConstantsBuffer |= (relocationInfo.relocationSegment == SegmentType::GlobalConstants);
153 this->dataRelocations.push_back(relocationInfo);
154 }
155
addElfTextSegmentRelocation(RelocationInfo relocationInfo,uint32_t instructionsSegmentId)156 void LinkerInput::addElfTextSegmentRelocation(RelocationInfo relocationInfo, uint32_t instructionsSegmentId) {
157 this->traits.requiresPatchingOfInstructionSegments = true;
158
159 if (instructionsSegmentId >= relocations.size()) {
160 static_assert(std::is_nothrow_move_constructible<decltype(relocations[0])>::value, "");
161 relocations.resize(instructionsSegmentId + 1);
162 }
163
164 auto &outRelocInfo = relocations[instructionsSegmentId];
165
166 relocationInfo.relocationSegment = SegmentType::Instructions;
167
168 outRelocInfo.push_back(std::move(relocationInfo));
169 }
170
decodeElfSymbolTableAndRelocations(Elf::Elf<Elf::EI_CLASS_64> & elf,const SectionNameToSegmentIdMap & nameToSegmentId)171 void LinkerInput::decodeElfSymbolTableAndRelocations(Elf::Elf<Elf::EI_CLASS_64> &elf, const SectionNameToSegmentIdMap &nameToSegmentId) {
172 for (auto &reloc : elf.getRelocations()) {
173 NEO::LinkerInput::RelocationInfo relocationInfo;
174 relocationInfo.offset = reloc.offset;
175 relocationInfo.symbolName = reloc.symbolName;
176
177 switch (reloc.relocType) {
178 case uint32_t(Elf::RELOCATION_X8664_TYPE::R_X8664_64):
179 relocationInfo.type = NEO::LinkerInput::RelocationInfo::Type::Address;
180 break;
181 case uint32_t(Elf::RELOCATION_X8664_TYPE::R_X8664_32):
182 relocationInfo.type = NEO::LinkerInput::RelocationInfo::Type::AddressLow;
183 break;
184 default: // Zebin relocation type
185 relocationInfo.type = reloc.relocType < uint32_t(NEO::LinkerInput::RelocationInfo::Type::RelocTypeMax)
186 ? static_cast<NEO::LinkerInput::RelocationInfo::Type>(reloc.relocType)
187 : NEO::LinkerInput::RelocationInfo::Type::Unknown;
188 break;
189 }
190 auto name = elf.getSectionName(reloc.targetSectionIndex);
191 ConstStringRef nameRef(name);
192
193 if (nameRef.startsWith(NEO::Elf::SectionsNamesZebin::textPrefix.data())) {
194 auto kernelName = name.substr(static_cast<int>(NEO::Elf::SectionsNamesZebin::textPrefix.length()));
195 auto segmentIdIter = nameToSegmentId.find(kernelName);
196 if (segmentIdIter != nameToSegmentId.end()) {
197 this->addElfTextSegmentRelocation(relocationInfo, segmentIdIter->second);
198 }
199 } else if (nameRef.startsWith(NEO::Elf::SpecialSectionNames::data.data())) {
200 auto symbolSectionName = elf.getSectionName(reloc.symbolSectionIndex);
201 auto symbolSegment = getSegmentForSection(symbolSectionName);
202 auto relocationSegment = getSegmentForSection(nameRef);
203 if (symbolSegment != NEO::SegmentType::Unknown &&
204 (relocationSegment == NEO::SegmentType::GlobalConstants || relocationSegment == NEO::SegmentType::GlobalVariables)) {
205 relocationInfo.relocationSegment = relocationSegment;
206 this->addDataRelocationInfo(relocationInfo);
207 }
208 }
209 }
210
211 symbols.reserve(elf.getSymbols().size());
212
213 for (auto &symbol : elf.getSymbols()) {
214 auto bind = elf.extractSymbolBind(symbol);
215
216 if (bind == Elf::SYMBOL_TABLE_BIND::STB_GLOBAL) {
217 SymbolInfo symbolInfo;
218 symbolInfo.offset = static_cast<uint32_t>(symbol.value);
219 symbolInfo.size = static_cast<uint32_t>(symbol.size);
220 auto type = elf.extractSymbolType(symbol);
221
222 auto symbolSectionName = elf.getSectionName(symbol.shndx);
223 auto symbolSegment = getSegmentForSection(symbolSectionName);
224
225 switch (type) {
226 default:
227 this->valid &= this->undefinedSymbolsAllowed;
228 DEBUG_BREAK_IF(false == this->undefinedSymbolsAllowed);
229 continue;
230 case Elf::SYMBOL_TABLE_TYPE::STT_OBJECT:
231 symbolInfo.segment = symbolSegment;
232 traits.exportsGlobalVariables |= symbolSegment == SegmentType::GlobalVariables;
233 traits.exportsGlobalConstants |= symbolSegment == SegmentType::GlobalConstants;
234 break;
235 case Elf::SYMBOL_TABLE_TYPE::STT_FUNC: {
236 auto kernelName = symbolSectionName.substr(static_cast<int>(NEO::Elf::SectionsNamesZebin::textPrefix.length()));
237 auto segmentIdIter = nameToSegmentId.find(kernelName);
238 if (segmentIdIter != nameToSegmentId.end()) {
239 symbolInfo.segment = SegmentType::Instructions;
240 traits.exportsFunctions = true;
241 int32_t instructionsSegmentId = static_cast<int32_t>(segmentIdIter->second);
242 UNRECOVERABLE_IF((this->exportedFunctionsSegmentId != -1) && (this->exportedFunctionsSegmentId != instructionsSegmentId));
243 this->exportedFunctionsSegmentId = instructionsSegmentId;
244 }
245 } break;
246 }
247 symbols.insert({elf.getSymbolName(symbol.name), symbolInfo});
248 }
249 }
250 }
251
processRelocations(const SegmentInfo & globalVariables,const SegmentInfo & globalConstants,const SegmentInfo & exportedFunctions,const SegmentInfo & globalStrings)252 bool Linker::processRelocations(const SegmentInfo &globalVariables, const SegmentInfo &globalConstants, const SegmentInfo &exportedFunctions, const SegmentInfo &globalStrings) {
253 relocatedSymbols.reserve(data.getSymbols().size());
254 for (auto &symbol : data.getSymbols()) {
255 const SegmentInfo *seg = nullptr;
256 switch (symbol.second.segment) {
257 default:
258 DEBUG_BREAK_IF(true);
259 return false;
260 case SegmentType::GlobalVariables:
261 seg = &globalVariables;
262 break;
263 case SegmentType::GlobalConstants:
264 seg = &globalConstants;
265 break;
266 case SegmentType::GlobalStrings:
267 seg = &globalStrings;
268 break;
269 case SegmentType::Instructions:
270 seg = &exportedFunctions;
271 break;
272 }
273 uintptr_t gpuAddress = seg->gpuAddress + symbol.second.offset;
274 if (symbol.second.offset + symbol.second.size > seg->segmentSize) {
275 DEBUG_BREAK_IF(true);
276 return false;
277 }
278 relocatedSymbols[symbol.first] = {symbol.second, gpuAddress};
279 }
280 return true;
281 }
282
addressSizeInBytes(LinkerInput::RelocationInfo::Type relocationtype)283 uint32_t addressSizeInBytes(LinkerInput::RelocationInfo::Type relocationtype) {
284 return (relocationtype == LinkerInput::RelocationInfo::Type::Address) ? sizeof(uintptr_t) : sizeof(uint32_t);
285 }
286
patchAddress(void * relocAddress,const Linker::RelocatedSymbol & symbol,const Linker::RelocationInfo & relocation)287 void Linker::patchAddress(void *relocAddress, const Linker::RelocatedSymbol &symbol, const Linker::RelocationInfo &relocation) {
288 uint64_t gpuAddressAs64bit = static_cast<uint64_t>(symbol.gpuAddress);
289 switch (relocation.type) {
290 default:
291 UNRECOVERABLE_IF(RelocationInfo::Type::Address != relocation.type);
292 *reinterpret_cast<uintptr_t *>(relocAddress) = symbol.gpuAddress;
293 break;
294 case RelocationInfo::Type::AddressLow:
295 *reinterpret_cast<uint32_t *>(relocAddress) = static_cast<uint32_t>(gpuAddressAs64bit & 0xffffffff);
296 break;
297 case RelocationInfo::Type::AddressHigh:
298 *reinterpret_cast<uint32_t *>(relocAddress) = static_cast<uint32_t>((gpuAddressAs64bit >> 32) & 0xffffffff);
299 break;
300 }
301 }
302
patchInstructionsSegments(const std::vector<PatchableSegment> & instructionsSegments,std::vector<UnresolvedExternal> & outUnresolvedExternals)303 void Linker::patchInstructionsSegments(const std::vector<PatchableSegment> &instructionsSegments, std::vector<UnresolvedExternal> &outUnresolvedExternals) {
304 if (false == data.getTraits().requiresPatchingOfInstructionSegments) {
305 return;
306 }
307 UNRECOVERABLE_IF(data.getRelocationsInInstructionSegments().size() > instructionsSegments.size());
308 auto segIt = instructionsSegments.begin();
309 uint32_t segId = 0u;
310 for (auto relocsIt = data.getRelocationsInInstructionSegments().begin(), relocsEnd = data.getRelocationsInInstructionSegments().end();
311 relocsIt != relocsEnd; ++relocsIt, ++segIt, ++segId) {
312 auto &thisSegmentRelocs = *relocsIt;
313 const PatchableSegment &instSeg = *segIt;
314 for (const auto &relocation : thisSegmentRelocs) {
315 if (shouldIgnoreRelocation(relocation)) {
316 continue;
317 }
318 UNRECOVERABLE_IF(nullptr == instSeg.hostPointer);
319 auto relocAddress = ptrOffset(instSeg.hostPointer, static_cast<uintptr_t>(relocation.offset));
320 if (relocation.symbolName == implicitArgsRelocationSymbolName) {
321 pImplicitArgsRelocationAddresses.insert({segId, reinterpret_cast<uint32_t *>(relocAddress)});
322 continue;
323 }
324 auto symbolIt = relocatedSymbols.find(relocation.symbolName);
325
326 bool invalidOffset = relocation.offset + addressSizeInBytes(relocation.type) > instSeg.segmentSize;
327 bool unresolvedExternal = (symbolIt == relocatedSymbols.end());
328
329 DEBUG_BREAK_IF(invalidOffset);
330 if (invalidOffset || unresolvedExternal) {
331 uint32_t segId = static_cast<uint32_t>(segIt - instructionsSegments.begin());
332 outUnresolvedExternals.push_back(UnresolvedExternal{relocation, segId, invalidOffset});
333 continue;
334 }
335
336 patchAddress(relocAddress, symbolIt->second, relocation);
337 }
338 }
339 }
340
patchDataSegments(const SegmentInfo & globalVariablesSegInfo,const SegmentInfo & globalConstantsSegInfo,GraphicsAllocation * globalVariablesSeg,GraphicsAllocation * globalConstantsSeg,std::vector<UnresolvedExternal> & outUnresolvedExternals,Device * pDevice,const void * constantsInitData,const void * variablesInitData)341 void Linker::patchDataSegments(const SegmentInfo &globalVariablesSegInfo, const SegmentInfo &globalConstantsSegInfo,
342 GraphicsAllocation *globalVariablesSeg, GraphicsAllocation *globalConstantsSeg,
343 std::vector<UnresolvedExternal> &outUnresolvedExternals, Device *pDevice,
344 const void *constantsInitData, const void *variablesInitData) {
345 for (const auto &relocation : data.getDataRelocations()) {
346 auto symbolIt = relocatedSymbols.find(relocation.symbolName);
347 if (symbolIt == relocatedSymbols.end()) {
348 outUnresolvedExternals.push_back(UnresolvedExternal{relocation});
349 continue;
350 }
351 uint64_t srcGpuAddressAs64Bit = symbolIt->second.gpuAddress;
352
353 GraphicsAllocation *dst = nullptr;
354 const void *initData = nullptr;
355 if (SegmentType::GlobalVariables == relocation.relocationSegment) {
356 dst = globalVariablesSeg;
357 initData = variablesInitData;
358 } else if (SegmentType::GlobalConstants == relocation.relocationSegment) {
359 dst = globalConstantsSeg;
360 initData = constantsInitData;
361 } else {
362 outUnresolvedExternals.push_back(UnresolvedExternal{relocation});
363 continue;
364 }
365 UNRECOVERABLE_IF(nullptr == dst);
366
367 auto relocType = (LinkerInput::Traits::PointerSize::Ptr32bit == data.getTraits().pointerSize) ? RelocationInfo::Type::AddressLow : relocation.type;
368 bool invalidOffset = relocation.offset + addressSizeInBytes(relocType) > dst->getUnderlyingBufferSize();
369 DEBUG_BREAK_IF(invalidOffset);
370 if (invalidOffset) {
371 outUnresolvedExternals.push_back(UnresolvedExternal{relocation});
372 continue;
373 }
374
375 uint64_t incrementValue = 0U;
376 switch (relocType) {
377 default:
378 UNRECOVERABLE_IF(RelocationInfo::Type::Address != relocType);
379 incrementValue = srcGpuAddressAs64Bit;
380 patchIncrement<uint64_t>(pDevice, dst, static_cast<size_t>(relocation.offset), initData, incrementValue);
381 break;
382 case RelocationInfo::Type::AddressLow:
383 incrementValue = srcGpuAddressAs64Bit & 0xffffffff;
384 patchIncrement<uint32_t>(pDevice, dst, static_cast<size_t>(relocation.offset), initData, incrementValue);
385 break;
386 case RelocationInfo::Type::AddressHigh:
387 incrementValue = (srcGpuAddressAs64Bit >> 32) & 0xffffffff;
388 patchIncrement<uint32_t>(pDevice, dst, static_cast<size_t>(relocation.offset), initData, incrementValue);
389 break;
390 }
391 }
392 }
393
constructLinkerErrorMessage(const Linker::UnresolvedExternals & unresolvedExternals,const std::vector<std::string> & instructionsSegmentsNames)394 std::string constructLinkerErrorMessage(const Linker::UnresolvedExternals &unresolvedExternals, const std::vector<std::string> &instructionsSegmentsNames) {
395 std::stringstream errorStream;
396 if (unresolvedExternals.size() == 0) {
397 errorStream << "Internal linker error";
398 } else {
399 for (const auto &unresExtern : unresolvedExternals) {
400 if (unresExtern.internalError) {
401 errorStream << "error : internal linker error while handling symbol ";
402 } else {
403 errorStream << "error : unresolved external symbol ";
404 }
405
406 if (unresExtern.unresolvedRelocation.relocationSegment == NEO::SegmentType::Instructions) {
407 errorStream << unresExtern.unresolvedRelocation.symbolName << " at offset " << unresExtern.unresolvedRelocation.offset
408 << " in instructions segment #" << unresExtern.instructionsSegmentId;
409 if (instructionsSegmentsNames.size() > unresExtern.instructionsSegmentId) {
410 errorStream << " (aka " << instructionsSegmentsNames[unresExtern.instructionsSegmentId] << ")";
411 }
412 } else {
413 errorStream << " symbol #" << unresExtern.unresolvedRelocation.symbolName << " at offset " << unresExtern.unresolvedRelocation.offset
414 << " in data segment #" << asString(unresExtern.unresolvedRelocation.relocationSegment);
415 }
416 errorStream << "\n";
417 }
418 }
419 return errorStream.str();
420 }
421
constructRelocationsDebugMessage(const Linker::RelocatedSymbolsMap & relocatedSymbols)422 std::string constructRelocationsDebugMessage(const Linker::RelocatedSymbolsMap &relocatedSymbols) {
423 if (relocatedSymbols.empty()) {
424 return "";
425 }
426 std::stringstream stream;
427 stream << "Relocations debug informations :\n";
428 for (const auto &symbol : relocatedSymbols) {
429 stream << " * \"" << symbol.first << "\" [" << symbol.second.symbol.size << " bytes]";
430 stream << " " << asString(symbol.second.symbol.segment) << "_SEGMENT@" << symbol.second.symbol.offset;
431 stream << " -> " << std::hex << std::showbase << symbol.second.gpuAddress << " GPUVA" << std::dec;
432 stream << "\n";
433 }
434 return stream.str();
435 }
436
applyDebugDataRelocations(const NEO::Elf::Elf<NEO::Elf::EI_CLASS_64> & decodedElf,ArrayRef<uint8_t> inputOutputElf,const SegmentInfo & text,const SegmentInfo & globalData,const SegmentInfo & constData)437 void Linker::applyDebugDataRelocations(const NEO::Elf::Elf<NEO::Elf::EI_CLASS_64> &decodedElf, ArrayRef<uint8_t> inputOutputElf, const SegmentInfo &text, const SegmentInfo &globalData, const SegmentInfo &constData) {
438
439 for (auto &reloc : decodedElf.getDebugInfoRelocations()) {
440 auto targetSectionName = decodedElf.getSectionName(reloc.targetSectionIndex);
441 auto sectionName = decodedElf.getSectionName(reloc.symbolSectionIndex);
442 auto symbolAddress = decodedElf.getSymbolValue(reloc.symbolTableIndex);
443
444 if (sectionName == Elf::SpecialSectionNames::text) {
445 symbolAddress += text.gpuAddress;
446 } else if (ConstStringRef(sectionName.c_str()).startsWith(Elf::SectionsNamesZebin::dataConst.data())) {
447 symbolAddress += constData.gpuAddress;
448 } else if (ConstStringRef(sectionName.c_str()).startsWith(Elf::SectionsNamesZebin::dataGlobal.data())) {
449 symbolAddress += globalData.gpuAddress;
450 } else {
451 // do not offset debug sections
452 if (!ConstStringRef(sectionName.c_str()).startsWith(Elf::SpecialSectionNames::debug.data())) {
453 // skip other sections
454 continue;
455 }
456 }
457
458 symbolAddress += reloc.addend;
459
460 auto targetSectionOffset = decodedElf.sectionHeaders[reloc.targetSectionIndex].header->offset;
461 auto relocLocation = reinterpret_cast<uint64_t>(inputOutputElf.begin()) + targetSectionOffset + reloc.offset;
462
463 if (static_cast<Elf::RELOCATION_X8664_TYPE>(reloc.relocType) == Elf::RELOCATION_X8664_TYPE::R_X8664_64) {
464 *reinterpret_cast<uint64_t *>(relocLocation) = symbolAddress;
465 } else if (static_cast<Elf::RELOCATION_X8664_TYPE>(reloc.relocType) == Elf::RELOCATION_X8664_TYPE::R_X8664_32) {
466 *reinterpret_cast<uint32_t *>(relocLocation) = static_cast<uint32_t>(symbolAddress & uint32_t(-1));
467 }
468 }
469 }
470
resolveImplicitArgs(const KernelDescriptorsT & kernelDescriptors,Device * pDevice)471 void Linker::resolveImplicitArgs(const KernelDescriptorsT &kernelDescriptors, Device *pDevice) {
472 for (auto i = 0u; i < kernelDescriptors.size(); i++) {
473 UNRECOVERABLE_IF(!kernelDescriptors[i]);
474 KernelDescriptor &kernelDescriptor = *kernelDescriptors[i];
475 auto pImplicitArgsReloc = pImplicitArgsRelocationAddresses.find(i);
476 if (pImplicitArgsReloc != pImplicitArgsRelocationAddresses.end()) {
477 UNRECOVERABLE_IF(!pDevice);
478 kernelDescriptor.kernelAttributes.flags.requiresImplicitArgs = kernelDescriptor.kernelAttributes.flags.useStackCalls || pDevice->getDebugger() != nullptr;
479 if (kernelDescriptor.kernelAttributes.flags.requiresImplicitArgs) {
480 *pImplicitArgsReloc->second = sizeof(ImplicitArgs);
481 } else {
482 *pImplicitArgsReloc->second = 0u;
483 }
484 }
485 }
486 }
487
resolveBuiltins(Device * pDevice,UnresolvedExternals & outUnresolvedExternals,const std::vector<PatchableSegment> & instructionsSegments)488 void Linker::resolveBuiltins(Device *pDevice, UnresolvedExternals &outUnresolvedExternals, const std::vector<PatchableSegment> &instructionsSegments) {
489 int vecIndex = static_cast<int>(outUnresolvedExternals.size() - 1u);
490 for (; vecIndex >= 0; --vecIndex) {
491 if (outUnresolvedExternals[vecIndex].unresolvedRelocation.symbolName == subDeviceID) {
492 RelocatedSymbol symbol;
493 symbol.gpuAddress = static_cast<uintptr_t>(pDevice->getDefaultEngine().commandStreamReceiver->getWorkPartitionAllocationGpuAddress());
494 auto relocAddress = ptrOffset(instructionsSegments[outUnresolvedExternals[vecIndex].instructionsSegmentId].hostPointer,
495 static_cast<uintptr_t>(outUnresolvedExternals[vecIndex].unresolvedRelocation.offset));
496
497 NEO::Linker::patchAddress(relocAddress, symbol, outUnresolvedExternals[vecIndex].unresolvedRelocation);
498
499 outUnresolvedExternals[vecIndex] = outUnresolvedExternals[outUnresolvedExternals.size() - 1u];
500 outUnresolvedExternals.resize(outUnresolvedExternals.size() - 1u);
501 }
502 }
503 }
504 } // namespace NEO