WiiUPluginLoaderBackend/source/plugin/PluginInformationFactory.cpp

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/****************************************************************************
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* Copyright (C) 2018-2020 Maschell
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
****************************************************************************/
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#include "PluginInformationFactory.h"
#include "../utils/ElfUtils.h"
#include "../utils/utils.h"
#include <coreinit/cache.h>
#include <map>
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#include <memory>
#include <string>
#include <vector>
#include <wups/function_patching.h>
using namespace ELFIO;
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std::optional<std::shared_ptr<PluginInformation>>
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PluginInformationFactory::load(const std::shared_ptr<PluginData> &pluginData, MEMHeapHandle heapHandle, relocation_trampoline_entry_t *trampoline_data, uint32_t trampoline_data_length,
uint8_t trampolineId) {
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if (pluginData->buffer == nullptr) {
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DEBUG_FUNCTION_LINE("Buffer was nullptr");
return std::nullopt;
}
elfio reader;
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if (!reader.load((char *) pluginData->buffer, pluginData->length)) {
DEBUG_FUNCTION_LINE("Can't process PluginData in elfio");
return std::nullopt;
}
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auto pluginInfo = std::make_shared<PluginInformation>();
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uint32_t sec_num = reader.sections.size();
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auto **destinations = (uint8_t **) malloc(sizeof(uint8_t *) * sec_num);
uint32_t totalSize = 0;
uint32_t text_size = 0;
uint32_t data_size = 0;
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for (uint32_t i = 0; i < sec_num; ++i) {
section *psec = reader.sections[i];
if (psec->get_type() == 0x80000002) {
continue;
}
if ((psec->get_type() == SHT_PROGBITS || psec->get_type() == SHT_NOBITS) && (psec->get_flags() & SHF_ALLOC)) {
uint32_t sectionSize = psec->get_size();
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auto address = (uint32_t) psec->get_address();
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if ((address >= 0x02000000) && address < 0x10000000) {
text_size += sectionSize;
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} else if ((address >= 0x10000000) && address < 0xC0000000) {
data_size += sectionSize;
}
if (psec->get_name().rfind(".wups.", 0) == 0) {
data_size += sectionSize;
}
}
}
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void *text_data = MEMAllocFromExpHeapEx(heapHandle, text_size, 0x1000);
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if (text_data == nullptr) {
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DEBUG_FUNCTION_LINE("Failed to alloc memory for the .text section (%d bytes)", text_size);
return std::nullopt;
}
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DEBUG_FUNCTION_LINE_VERBOSE("Allocated %d kb from ExpHeap", text_size / 1024);
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void *data_data = MEMAllocFromExpHeapEx(heapHandle, data_size, 0x1000);
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if (data_data == nullptr) {
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DEBUG_FUNCTION_LINE("Failed to alloc memory for the .data section (%d bytes)", data_size);
MEMFreeToExpHeap(heapHandle, text_data);
return std::nullopt;
}
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DEBUG_FUNCTION_LINE_VERBOSE("Allocated %d kb from ExpHeap", data_size / 1024);
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for (uint32_t i = 0; i < sec_num; ++i) {
section *psec = reader.sections[i];
if (psec->get_type() == 0x80000002) {
continue;
}
if ((psec->get_type() == SHT_PROGBITS || psec->get_type() == SHT_NOBITS) && (psec->get_flags() & SHF_ALLOC)) {
uint32_t sectionSize = psec->get_size();
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auto address = (uint32_t) psec->get_address();
uint32_t destination = address;
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if ((address >= 0x02000000) && address < 0x10000000) {
destination += (uint32_t) text_data;
destination -= 0x02000000;
destinations[psec->get_index()] = (uint8_t *) text_data;
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} else if ((address >= 0x10000000) && address < 0xC0000000) {
destination += (uint32_t) data_data;
destination -= 0x10000000;
destinations[psec->get_index()] = (uint8_t *) data_data;
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} else if (address >= 0xC0000000) {
destination += (uint32_t) data_data;
destination -= 0xC0000000;
//destinations[psec->get_index()] = (uint8_t *) data_data;
//destinations[psec->get_index()] -= 0xC0000000;
} else {
DEBUG_FUNCTION_LINE("Unhandled case");
free(destinations);
MEMFreeToExpHeap(heapHandle, text_data);
MEMFreeToExpHeap(heapHandle, data_data);
return std::nullopt;
}
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const char *p = psec->get_data();
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if (psec->get_type() == SHT_NOBITS) {
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DEBUG_FUNCTION_LINE_VERBOSE("memset section %s %08X to 0 (%d bytes)", psec->get_name().c_str(), destination, sectionSize);
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memset((void *) destination, 0, sectionSize);
} else if (psec->get_type() == SHT_PROGBITS) {
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DEBUG_FUNCTION_LINE_VERBOSE("Copy section %s %08X -> %08X (%d bytes)", psec->get_name().c_str(), p, destination, sectionSize);
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memcpy((void *) destination, p, sectionSize);
}
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std::string sectionName(psec->get_name());
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pluginInfo->addSectionInfo(std::make_shared<SectionInfo>(sectionName, destination, sectionSize));
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DEBUG_FUNCTION_LINE_VERBOSE("Saved %s section info. Location: %08X size: %08X", psec->get_name().c_str(), destination, sectionSize);
totalSize += sectionSize;
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DCFlushRange((void *) destination, sectionSize);
ICInvalidateRange((void *) destination, sectionSize);
}
}
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for (uint32_t i = 0; i < sec_num; ++i) {
section *psec = reader.sections[i];
if ((psec->get_type() == SHT_PROGBITS || psec->get_type() == SHT_NOBITS) && (psec->get_flags() & SHF_ALLOC)) {
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DEBUG_FUNCTION_LINE_VERBOSE("Linking (%d)... %s at %08X", i, psec->get_name().c_str(), destinations[psec->get_index()]);
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if (!linkSection(reader, psec->get_index(), (uint32_t) destinations[psec->get_index()], (uint32_t) text_data, (uint32_t) data_data, trampoline_data, trampoline_data_length,
trampolineId)) {
DEBUG_FUNCTION_LINE("elfLink failed");
free(destinations);
MEMFreeToExpHeap(heapHandle, text_data);
MEMFreeToExpHeap(heapHandle, data_data);
return std::nullopt;
}
}
}
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auto relocationData = getImportRelocationData(reader, destinations);
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for (auto const &reloc : relocationData) {
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pluginInfo->addRelocationData(reloc);
}
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DCFlushRange((void *) text_data, text_size);
ICInvalidateRange((void *) text_data, text_size);
DCFlushRange((void *) data_data, data_size);
ICInvalidateRange((void *) data_data, data_size);
free(destinations);
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pluginInfo->setTrampolineId(trampolineId);
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auto secInfo = pluginInfo->getSectionInfo(".wups.hooks");
if (secInfo && secInfo.value()->getSize() > 0) {
size_t entries_count = secInfo.value()->getSize() / sizeof(wups_loader_hook_t);
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auto *entries = (wups_loader_hook_t *) secInfo.value()->getAddress();
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if (entries != nullptr) {
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for (size_t j = 0; j < entries_count; j++) {
wups_loader_hook_t *hook = &entries[j];
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DEBUG_FUNCTION_LINE_VERBOSE("Saving hook of plugin Type: %08X, target: %08X" /*,pluginData->getPluginInformation()->getName().c_str()*/, hook->type, (void *) hook->target);
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auto hook_data = std::make_shared<HookData>((void *) hook->target, hook->type);
pluginInfo->addHookData(hook_data);
}
}
}
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secInfo = pluginInfo->getSectionInfo(".wups.load");
if (secInfo && secInfo.value()->getSize() > 0) {
size_t entries_count = secInfo.value()->getSize() / sizeof(wups_loader_entry_t);
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auto *entries = (wups_loader_entry_t *) secInfo.value()->getAddress();
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if (entries != nullptr) {
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for (size_t j = 0; j < entries_count; j++) {
wups_loader_entry_t *cur_function = &entries[j];
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DEBUG_FUNCTION_LINE_VERBOSE("Saving function \"%s\" of plugin . PA:%08X VA:%08X Library: %08X, target: %08X, call_addr: %08X",
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cur_function->_function.name /*,pluginData->getPluginInformation()->getName().c_str()*/,
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cur_function->_function.physical_address, cur_function->_function.virtual_address, cur_function->_function.library, cur_function->_function.target,
(void *) cur_function->_function.call_addr);
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auto function_data = std::make_shared<FunctionData>((void *) cur_function->_function.physical_address, (void *) cur_function->_function.virtual_address, cur_function->_function.name,
(function_replacement_library_type_t) cur_function->_function.library,
(void *) cur_function->_function.target, (void *) cur_function->_function.call_addr,
(FunctionPatcherTargetProcess) cur_function->_function.targetProcess);
pluginInfo->addFunctionData(function_data);
}
}
}
// Get the symbol for functions.
Elf_Half n = reader.sections.size();
for (Elf_Half i = 0; i < n; ++i) {
section *sec = reader.sections[i];
if (SHT_SYMTAB == sec->get_type()) {
symbol_section_accessor symbols(reader, sec);
auto sym_no = (uint32_t) symbols.get_symbols_num();
if (sym_no > 0) {
for (Elf_Half j = 0; j < sym_no; ++j) {
std::string name;
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Elf64_Addr value = 0;
Elf_Xword size = 0;
unsigned char bind = 0;
unsigned char type = 0;
Elf_Half section = 0;
unsigned char other = 0;
if (symbols.get_symbol(j, name, value, size, bind, type, section, other)) {
if (type == STT_FUNC) { // We only care about functions.
auto sectionVal = reader.sections[section];
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auto offsetVal = value - sectionVal->get_address();
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auto sectionOpt = pluginInfo->getSectionInfo(sectionVal->get_name());
if (!sectionOpt.has_value()) {
continue;
}
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auto finalAddress = offsetVal + sectionOpt.value()->getAddress();
pluginInfo->addFunctionSymbolData(std::make_shared<FunctionSymbolData>(name, (void *) finalAddress, (uint32_t) size));
}
}
}
break;
}
}
}
// Save the addresses for the allocated memory. This way we can free it again :)
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pluginInfo->allocatedDataMemoryAddress = data_data;
pluginInfo->allocatedTextMemoryAddress = text_data;
return pluginInfo;
}
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std::vector<std::shared_ptr<RelocationData>> PluginInformationFactory::getImportRelocationData(const elfio &reader, uint8_t **destinations) {
std::vector<std::shared_ptr<RelocationData>> result;
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std::map<uint32_t, std::string> infoMap;
uint32_t sec_num = reader.sections.size();
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for (uint32_t i = 0; i < sec_num; ++i) {
section *psec = reader.sections[i];
if (psec->get_type() == 0x80000002) {
infoMap[i] = psec->get_name();
}
}
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for (uint32_t i = 0; i < sec_num; ++i) {
section *psec = reader.sections[i];
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if (psec->get_type() == SHT_RELA || psec->get_type() == SHT_REL) {
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DEBUG_FUNCTION_LINE_VERBOSE("Found relocation section %s", psec->get_name().c_str());
relocation_section_accessor rel(reader, psec);
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for (uint32_t j = 0; j < (uint32_t) rel.get_entries_num(); ++j) {
Elf64_Addr offset;
Elf_Word type;
Elf_Sxword addend;
std::string sym_name;
Elf64_Addr sym_value;
Elf_Half sym_section_index;
if (!rel.get_entry(j, offset, sym_value, sym_name, type, addend, sym_section_index)) {
DEBUG_FUNCTION_LINE("Failed to get relocation");
break;
}
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auto adjusted_sym_value = (uint32_t) sym_value;
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if (adjusted_sym_value < 0xC0000000) {
continue;
}
std::string fimport = ".fimport_";
std::string dimport = ".dimport_";
bool isData = false;
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std::string rplName;
std::string rawSectionName = infoMap[sym_section_index];
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if (rawSectionName.size() < fimport.size()) {
DEBUG_FUNCTION_LINE("Section name was shorter than expected, skipping this relocation");
continue;
} else if (std::equal(fimport.begin(), fimport.end(), rawSectionName.begin())) {
rplName = rawSectionName.substr(fimport.size());
} else if (std::equal(dimport.begin(), dimport.end(), rawSectionName.begin())) {
rplName = rawSectionName.substr(dimport.size());
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isData = true;
} else {
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DEBUG_FUNCTION_LINE("invalid section name");
continue;
}
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auto rplInfo = std::make_shared<ImportRPLInformation>(rplName, isData);
uint32_t section_index = psec->get_info();
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result.push_back(std::make_shared<RelocationData>(type, offset - 0x02000000, addend, (void *) (destinations[section_index]), sym_name, rplInfo));
}
}
}
return result;
}
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bool PluginInformationFactory::linkSection(const elfio &reader, uint32_t section_index, uint32_t destination, uint32_t base_text, uint32_t base_data, relocation_trampoline_entry_t *trampoline_data,
uint32_t trampoline_data_length,
uint8_t trampolineId) {
uint32_t sec_num = reader.sections.size();
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for (uint32_t i = 0; i < sec_num; ++i) {
section *psec = reader.sections[i];
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if (psec->get_info() == section_index) {
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DEBUG_FUNCTION_LINE_VERBOSE("Found relocation section %s", psec->get_name().c_str());
relocation_section_accessor rel(reader, psec);
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for (uint32_t j = 0; j < (uint32_t) rel.get_entries_num(); ++j) {
Elf64_Addr offset;
Elf_Word type;
Elf_Sxword addend;
std::string sym_name;
Elf64_Addr sym_value;
Elf_Half sym_section_index;
if (!rel.get_entry(j, offset, sym_value, sym_name, type, addend, sym_section_index)) {
DEBUG_FUNCTION_LINE("Failed to get relocation");
break;
}
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auto adjusted_sym_value = (uint32_t) sym_value;
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if ((adjusted_sym_value >= 0x02000000) && adjusted_sym_value < 0x10000000) {
adjusted_sym_value -= 0x02000000;
adjusted_sym_value += base_text;
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} else if ((adjusted_sym_value >= 0x10000000) && adjusted_sym_value < 0xC0000000) {
adjusted_sym_value -= 0x10000000;
adjusted_sym_value += base_data;
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} else if (adjusted_sym_value >= 0xC0000000) {
//DEBUG_FUNCTION_LINE("Skip imports");
// Skip imports
continue;
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} else if (adjusted_sym_value == 0x0) {
//
} else {
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DEBUG_FUNCTION_LINE("Unhandled case %08X", adjusted_sym_value);
return false;
}
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auto adjusted_offset = (uint32_t) offset;
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if ((offset >= 0x02000000) && offset < 0x10000000) {
adjusted_offset -= 0x02000000;
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} else if ((adjusted_offset >= 0x10000000) && adjusted_offset < 0xC0000000) {
adjusted_offset -= 0x10000000;
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} else if (adjusted_offset >= 0xC0000000) {
adjusted_offset -= 0xC0000000;
}
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if (sym_section_index == SHN_ABS) {
//
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} else if (sym_section_index > SHN_LORESERVE) {
DEBUG_FUNCTION_LINE("NOT IMPLEMENTED: %04X", sym_section_index);
return false;
}
// DEBUG_FUNCTION_LINE_VERBOSE("sym_value %08X adjusted_sym_value %08X offset %08X adjusted_offset %08X", (uint32_t) sym_value, adjusted_sym_value, (uint32_t) offset, adjusted_offset);
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if (!ElfUtils::elfLinkOne(type, adjusted_offset, addend, destination, adjusted_sym_value, trampoline_data, trampoline_data_length, RELOC_TYPE_FIXED, trampolineId)) {
DEBUG_FUNCTION_LINE("Link failed");
return false;
}
}
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DEBUG_FUNCTION_LINE_VERBOSE("done");
return true;
}
}
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DEBUG_FUNCTION_LINE_VERBOSE("Failed to find relocation section");
return true;
}