106 lines
4.8 KiB
C++
106 lines
4.8 KiB
C++
#include "DynamicLinkingHelper.h"
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#include <cstring>
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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 & function : data->functions) {
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dyn_linking_function_t *curEntry = &function;
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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.\n");
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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 & import : data->imports) {
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dyn_linking_import_t *curEntry = &import;
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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.\n");
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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::addRelocationEntry(dyn_linking_relocation_data_t *linking_data, dyn_linking_relocation_entry_t *linking_entries, uint32_t linking_entry_length, const RelocationData &relocationData) {
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return addRelocationEntry(linking_data, linking_entries, linking_entry_length, relocationData.getType(),
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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::addRelocationEntry(dyn_linking_relocation_data_t *linking_data, dyn_linking_relocation_entry_t *linking_entries, uint32_t linking_entry_length, char type, size_t offset, int32_t addend, void *destination,
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const std::string& name, const 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.\n", 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.\n", DYN_LINK_FUNCTION_LIST_LENGTH);
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return false;
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}
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return addRelocationEntry(linking_entries, linking_entry_length, type, offset, addend, destination, functionInfo,
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importInfoGbl);
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}
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bool DynamicLinkingHelper::addRelocationEntry(dyn_linking_relocation_entry_t *linking_entries, uint32_t linking_entry_length, char type, size_t offset, int32_t addend, void *destination, 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 = 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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return false;
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}
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