106 lines
5.0 KiB
C++
106 lines
5.0 KiB
C++
#include "DynamicLinkingHelper.h"
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#include <cstring>
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#include <memory>
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dyn_linking_function_t *DynamicLinkingHelper::getOrAddFunctionEntryByName(dyn_linking_relocation_data_t *data, const char *functionName) {
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if (data == nullptr) {
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return nullptr;
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}
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if (functionName == nullptr) {
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return nullptr;
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}
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dyn_linking_function_t *result = nullptr;
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for (auto &curEntry : data->functions) {
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if (strlen(curEntry.functionName) == 0) {
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if (strlen(functionName) > DYN_LINK_FUNCTION_NAME_LENGTH) {
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DEBUG_FUNCTION_LINE("Failed to add function name, it's too long.");
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return nullptr;
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}
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strncpy(curEntry.functionName, functionName, DYN_LINK_FUNCTION_NAME_LENGTH);
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result = &curEntry;
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break;
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}
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if (strncmp(curEntry.functionName, functionName, DYN_LINK_FUNCTION_NAME_LENGTH) == 0) {
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result = &curEntry;
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break;
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}
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}
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return result;
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}
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dyn_linking_import_t *DynamicLinkingHelper::getOrAddFunctionImportByName(dyn_linking_relocation_data_t *data, const char *importName) {
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return getOrAddImport(data, importName, false);
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}
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dyn_linking_import_t *DynamicLinkingHelper::getOrAddDataImportByName(dyn_linking_relocation_data_t *data, const char *importName) {
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return getOrAddImport(data, importName, true);
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}
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dyn_linking_import_t *DynamicLinkingHelper::getOrAddImport(dyn_linking_relocation_data_t *data, const char *importName, bool isData) {
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if (importName == nullptr || data == nullptr) {
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return nullptr;
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}
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dyn_linking_import_t *result = nullptr;
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for (auto &curEntry : data->imports) {
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if (strlen(curEntry.importName) == 0) {
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if (strlen(importName) > DYN_LINK_IMPORT_NAME_LENGTH) {
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DEBUG_FUNCTION_LINE("Failed to add Import, it's too long.");
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return nullptr;
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}
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strncpy(curEntry.importName, importName, DYN_LINK_IMPORT_NAME_LENGTH);
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curEntry.isData = isData;
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result = &curEntry;
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break;
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}
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if (strncmp(curEntry.importName, importName, DYN_LINK_IMPORT_NAME_LENGTH) == 0 && (curEntry.isData == isData)) {
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return &curEntry;
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}
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}
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return result;
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}
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bool DynamicLinkingHelper::addReloationEntry(dyn_linking_relocation_data_t *linking_data, dyn_linking_relocation_entry_t *linking_entries, uint32_t linking_entry_length,
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const std::shared_ptr<RelocationData> &relocationData) {
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return addReloationEntry(linking_data, linking_entries, linking_entry_length, relocationData->getType(), relocationData->getOffset(), relocationData->getAddend(), relocationData->getDestination(),
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relocationData->getName(),
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relocationData->getImportRPLInformation());
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}
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bool DynamicLinkingHelper::addReloationEntry(dyn_linking_relocation_data_t *linking_data, dyn_linking_relocation_entry_t *linking_entries, uint32_t linking_entry_length, char type, size_t offset,
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int32_t addend, const void *destination,
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const std::string &name, const std::shared_ptr<ImportRPLInformation> &rplInfo) {
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dyn_linking_import_t *importInfoGbl = DynamicLinkingHelper::getOrAddImport(linking_data, rplInfo->getName().c_str(), rplInfo->isData());
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if (importInfoGbl == nullptr) {
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DEBUG_FUNCTION_LINE("Getting import info failed. Probably maximum of %d rpl files to import reached.", DYN_LINK_IMPORT_LIST_LENGTH);
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return false;
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}
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dyn_linking_function_t *functionInfo = DynamicLinkingHelper::getOrAddFunctionEntryByName(linking_data, name.c_str());
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if (functionInfo == nullptr) {
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DEBUG_FUNCTION_LINE("Getting import info failed. Probably maximum of %d function to be relocated reached.", DYN_LINK_FUNCTION_LIST_LENGTH);
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return false;
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}
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return addReloationEntry(linking_entries, linking_entry_length, type, offset, addend, destination, functionInfo, importInfoGbl);
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}
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bool DynamicLinkingHelper::addReloationEntry(dyn_linking_relocation_entry_t *linking_entries, uint32_t linking_entry_length, char type, size_t offset, int32_t addend, const void *destination,
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dyn_linking_function_t *functionName,
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dyn_linking_import_t *importInfo) {
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for (uint32_t i = 0; i < linking_entry_length; i++) {
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dyn_linking_relocation_entry_t *curEntry = &(linking_entries[i]);
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if (curEntry->functionEntry != nullptr) {
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continue;
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}
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curEntry->type = type;
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curEntry->offset = offset;
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curEntry->addend = addend;
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curEntry->destination = (void *) destination;
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curEntry->functionEntry = functionName;
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curEntry->importEntry = importInfo;
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return true;
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}
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DEBUG_FUNCTION_LINE("Failed to find empty slot for saving relocations entry. We ned more than %d slots.", linking_entry_length);
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return false;
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}
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