266 lines
11 KiB
C++
266 lines
11 KiB
C++
/****************************************************************************
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* Copyright (C) 2018-2020 Maschell
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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****************************************************************************/
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#include "ModuleDataFactory.h"
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#include "../ElfUtils.h"
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#include "elfio/elfio.hpp"
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#include <coreinit/cache.h>
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#include <map>
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#include <string>
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#include <vector>
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using namespace ELFIO;
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std::optional<ModuleData>
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ModuleDataFactory::load(const std::string &path, uint32_t destination_address, uint32_t maximum_size, relocation_trampolin_entry_t *trampolin_data, uint32_t trampolin_data_length) {
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elfio reader;
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ModuleData moduleData;
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// Load ELF data
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if (!reader.load(path)) {
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DEBUG_FUNCTION_LINE("Can't find or process %s", path.c_str());
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return {};
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}
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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);
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uint32_t sizeOfModule = 0;
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for (uint32_t i = 0; i < sec_num; ++i) {
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section *psec = reader.sections[i];
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if (psec->get_type() == 0x80000002) {
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continue;
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}
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if ((psec->get_type() == SHT_PROGBITS || psec->get_type() == SHT_NOBITS) && (psec->get_flags() & SHF_ALLOC)) {
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sizeOfModule += psec->get_size() + 1;
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}
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}
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if (sizeOfModule > maximum_size) {
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DEBUG_FUNCTION_LINE("Module is too big.");
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return {};
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}
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uint32_t baseOffset = (destination_address - sizeOfModule) & 0xFFFFFF00;
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uint32_t offset_text = baseOffset;
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uint32_t offset_data = offset_text;
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uint32_t entrypoint = offset_text + (uint32_t) reader.get_entry() - 0x02000000;
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uint32_t totalSize = 0;
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for (uint32_t i = 0; i < sec_num; ++i) {
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section *psec = reader.sections[i];
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if (psec->get_type() == 0x80000002) {
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continue;
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}
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if ((psec->get_type() == SHT_PROGBITS || psec->get_type() == SHT_NOBITS) && (psec->get_flags() & SHF_ALLOC)) {
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uint32_t sectionSize = psec->get_size();
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auto address = (uint32_t) psec->get_address();
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destinations[psec->get_index()] = (uint8_t *) baseOffset;
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uint32_t destination = baseOffset + address;
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if ((address >= 0x02000000) && address < 0x10000000) {
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destination -= 0x02000000;
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destinations[psec->get_index()] -= 0x02000000;
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baseOffset += sectionSize;
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offset_data += sectionSize;
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} else if ((address >= 0x10000000) && address < 0xC0000000) {
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destination -= 0x10000000;
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destinations[psec->get_index()] -= 0x10000000;
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} else if (address >= 0xC0000000) {
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destination -= 0xC0000000;
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destinations[psec->get_index()] -= 0xC0000000;
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} else {
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DEBUG_FUNCTION_LINE("Unhandled case");
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free(destinations);
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return {};
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}
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const char *p = reader.sections[i]->get_data();
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if (psec->get_type() == SHT_NOBITS) {
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DEBUG_FUNCTION_LINE("memset section %s %08X [%08X] to 0 (%d bytes)", psec->get_name().c_str(), destination, destination + sectionSize, sectionSize);
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memset((void *) destination, 0, sectionSize);
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} else if (psec->get_type() == SHT_PROGBITS) {
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DEBUG_FUNCTION_LINE("Copy section %s %08X -> %08X [%08X] (%d bytes)", psec->get_name().c_str(), p, destination, destination + sectionSize, sectionSize);
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memcpy((void *) destination, p, sectionSize);
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}
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//nextAddress = ROUNDUP(destination + sectionSize,0x100);
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if (psec->get_name() == ".bss") {
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moduleData.setBSSLocation(destination, sectionSize);
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DEBUG_FUNCTION_LINE("Saved %s section info. Location: %08X size: %08X", psec->get_name().c_str(), destination, sectionSize);
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} else if (psec->get_name() == ".sbss") {
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moduleData.setSBSSLocation(destination, sectionSize);
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DEBUG_FUNCTION_LINE("Saved %s section info. Location: %08X size: %08X", psec->get_name().c_str(), destination, sectionSize);
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}
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totalSize += sectionSize;
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DEBUG_FUNCTION_LINE("DCFlushRange %08X - %08X", destination, destination + sectionSize);
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DCFlushRange((void *) destination, sectionSize);
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DEBUG_FUNCTION_LINE("ICInvalidateRange %08X - %08X", destination, destination + sectionSize);
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ICInvalidateRange((void *) destination, sectionSize);
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}
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}
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for (uint32_t i = 0; i < sec_num; ++i) {
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section *psec = reader.sections[i];
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if ((psec->get_type() == SHT_PROGBITS || psec->get_type() == SHT_NOBITS) && (psec->get_flags() & SHF_ALLOC)) {
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DEBUG_FUNCTION_LINE("Linking (%d)... %s", i, psec->get_name().c_str());
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if (!linkSection(reader, psec->get_index(), (uint32_t) destinations[psec->get_index()], offset_text, offset_data, trampolin_data, trampolin_data_length)) {
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DEBUG_FUNCTION_LINE("elfLink failed");
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free(destinations);
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return {};
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}
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}
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}
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std::vector<RelocationData> relocationData = getImportRelocationData(reader, destinations);
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for (auto const &reloc : relocationData) {
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moduleData.addRelocationData(reloc);
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}
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DEBUG_FUNCTION_LINE("DCFlushRange %08X - %08X", baseOffset, baseOffset + totalSize);
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DCFlushRange((void *) baseOffset, totalSize);
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DEBUG_FUNCTION_LINE("ICInvalidateRange %08X - %08X", baseOffset, baseOffset + totalSize);
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ICInvalidateRange((void *) baseOffset, totalSize);
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free(destinations);
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moduleData.setEntrypoint(entrypoint);
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DEBUG_FUNCTION_LINE("Saved entrypoint as %08X", entrypoint);
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return moduleData;
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}
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std::vector<RelocationData> ModuleDataFactory::getImportRelocationData(const elfio &reader, uint8_t **destinations) {
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std::vector<RelocationData> result;
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std::map<uint32_t, std::string> infoMap;
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uint32_t sec_num = reader.sections.size();
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for (uint32_t i = 0; i < sec_num; ++i) {
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section *psec = reader.sections[i];
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if (psec->get_type() == 0x80000002) {
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infoMap[i] = psec->get_name();
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}
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}
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for (uint32_t i = 0; i < sec_num; ++i) {
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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("Found relocation section %s", psec->get_name().c_str());
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relocation_section_accessor rel(reader, psec);
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for (uint32_t j = 0; j < (uint32_t) rel.get_entries_num(); ++j) {
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Elf64_Addr offset;
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Elf_Word type;
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Elf_Sxword addend;
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std::string sym_name;
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Elf64_Addr sym_value;
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Elf_Half sym_section_index;
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if (!rel.get_entry(j, offset, sym_value, sym_name, type, addend, sym_section_index)) {
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DEBUG_FUNCTION_LINE("Failed to get relocation");
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break;
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}
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auto adjusted_sym_value = (uint32_t) sym_value;
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if (adjusted_sym_value < 0xC0000000) {
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continue;
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}
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std::optional<ImportRPLInformation> rplInfo = ImportRPLInformation::createImportRPLInformation(infoMap[sym_section_index]);
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if (!rplInfo) {
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DEBUG_FUNCTION_LINE("Failed to create import information");
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break;
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}
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uint32_t section_index = psec->get_info();
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// When these relocations are performed, we don't need the 0xC0000000 offset anymore.
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RelocationData relocationData(type, offset - 0x02000000, addend, (void *) (destinations[section_index] + 0x02000000), sym_name, rplInfo.value());
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//relocationData->printInformation();
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result.push_back(relocationData);
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}
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}
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}
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return result;
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}
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bool ModuleDataFactory::linkSection(const elfio &reader, uint32_t section_index, uint32_t destination, uint32_t base_text, uint32_t base_data, relocation_trampolin_entry_t *trampolin_data,
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uint32_t trampolin_data_length) {
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uint32_t sec_num = reader.sections.size();
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for (uint32_t i = 0; i < sec_num; ++i) {
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section *psec = reader.sections[i];
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if (psec->get_info() == section_index) {
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DEBUG_FUNCTION_LINE("Found relocation section %s", psec->get_name().c_str());
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relocation_section_accessor rel(reader, psec);
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for (uint32_t j = 0; j < (uint32_t) rel.get_entries_num(); ++j) {
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Elf64_Addr offset;
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Elf_Word type;
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Elf_Sxword addend;
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std::string sym_name;
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Elf64_Addr sym_value;
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Elf_Half sym_section_index;
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if (!rel.get_entry(j, offset, sym_value, sym_name, type, addend, sym_section_index)) {
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DEBUG_FUNCTION_LINE("Failed to get relocation");
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break;
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}
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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) {
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adjusted_sym_value -= 0x02000000;
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adjusted_sym_value += base_text;
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} else if ((adjusted_sym_value >= 0x10000000) && adjusted_sym_value < 0xC0000000) {
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adjusted_sym_value -= 0x10000000;
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adjusted_sym_value += base_data;
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} else if (adjusted_sym_value >= 0xC0000000) {
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// Skip imports
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continue;
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} else if (adjusted_sym_value == 0x0) {
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//
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} else {
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DEBUG_FUNCTION_LINE("Unhandled case %08X", adjusted_sym_value);
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return false;
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}
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if (sym_section_index == SHN_ABS) {
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//
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} else if (sym_section_index > SHN_LORESERVE) {
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DEBUG_FUNCTION_LINE("NOT IMPLEMENTED: %04X", sym_section_index);
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return false;
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}
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if (!ElfUtils::elfLinkOne(type, offset, addend, destination, adjusted_sym_value, trampolin_data, trampolin_data_length, RELOC_TYPE_FIXED)) {
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DEBUG_FUNCTION_LINE("Link failed");
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return false;
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}
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}
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DEBUG_FUNCTION_LINE("done");
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}
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}
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return true;
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}
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