EnvironmentLoader/source/module/ModuleDataFactory.cpp
2022-05-13 19:18:19 +02:00

289 lines
12 KiB
C++

/****************************************************************************
* Copyright (C) 2018-2021 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/>.
****************************************************************************/
#include "ModuleDataFactory.h"
#include "../utils/FileUtils.h"
#include "ElfUtils.h"
#include <coreinit/cache.h>
#include <map>
#include <string>
#include <vector>
using namespace ELFIO;
std::optional<std::shared_ptr<ModuleData>>
ModuleDataFactory::load(const std::string &path, uint32_t destination_address_end, uint32_t maximum_size, relocation_trampoline_entry_t *trampoline_data, uint32_t trampoline_data_length) {
elfio reader;
std::shared_ptr<ModuleData> moduleData = std::make_shared<ModuleData>();
uint8_t *buffer = nullptr;
uint32_t fsize = 0;
if (LoadFileToMem(path.c_str(), &buffer, &fsize) < 0) {
DEBUG_FUNCTION_LINE_ERR("Failed to load file");
return {};
}
// Load ELF data
if (!reader.load(reinterpret_cast<char *>(buffer), fsize)) {
DEBUG_FUNCTION_LINE_ERR("Can't find or process %s", path.c_str());
free(buffer);
return {};
}
uint32_t sec_num = reader.sections.size();
auto **destinations = (uint8_t **) malloc(sizeof(uint8_t *) * sec_num);
uint32_t sizeOfModule = 0;
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)) {
sizeOfModule += psec->get_size() + 1;
}
}
if (sizeOfModule > maximum_size) {
DEBUG_FUNCTION_LINE_ERR("Module is too big.");
free(destinations);
free(buffer);
return {};
}
uint32_t baseOffset = (destination_address_end - sizeOfModule) & 0xFFFFFF00;
uint32_t startAddress = baseOffset;
uint32_t offset_text = baseOffset;
uint32_t offset_data = offset_text;
uint32_t entrypoint = offset_text + (uint32_t) reader.get_entry() - 0x02000000;
uint32_t totalSize = 0;
uint32_t endAddress = 0;
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();
totalSize += sectionSize;
if (totalSize > maximum_size) {
DEBUG_FUNCTION_LINE_ERR("Couldn't load setup module because it's too big.");
free(destinations);
free(buffer);
return {};
}
auto address = (uint32_t) psec->get_address();
destinations[psec->get_index()] = (uint8_t *) baseOffset;
uint32_t destination = baseOffset + address;
if ((address >= 0x02000000) && address < 0x10000000) {
destination -= 0x02000000;
destinations[psec->get_index()] -= 0x02000000;
baseOffset += sectionSize;
offset_data += sectionSize;
} else if ((address >= 0x10000000) && address < 0xC0000000) {
destination -= 0x10000000;
destinations[psec->get_index()] -= 0x10000000;
} else if (address >= 0xC0000000) {
destination -= 0xC0000000;
destinations[psec->get_index()] -= 0xC0000000;
} else {
DEBUG_FUNCTION_LINE_ERR("Unhandled case");
free(destinations);
free(buffer);
return std::nullopt;
}
const char *p = reader.sections[i]->get_data();
if (psec->get_type() == SHT_NOBITS) {
DEBUG_FUNCTION_LINE("memset section %s %08X to 0 (%d bytes)", psec->get_name().c_str(), destination, sectionSize);
memset((void *) destination, 0, sectionSize);
} else if (psec->get_type() == SHT_PROGBITS) {
DEBUG_FUNCTION_LINE("Copy section %s %08X -> %08X (%d bytes)", psec->get_name().c_str(), p, destination, sectionSize);
memcpy((void *) destination, p, sectionSize);
}
//nextAddress = ROUNDUP(destination + sectionSize, 0x100);
if (psec->get_name() == ".bss") {
DEBUG_FUNCTION_LINE("memset %s section. Location: %08X size: %08X", psec->get_name().c_str(), destination, sectionSize);
memset(reinterpret_cast<void *>(destination), 0, sectionSize);
} else if (psec->get_name() == ".sbss") {
DEBUG_FUNCTION_LINE("memset %s section. Location: %08X size: %08X", psec->get_name().c_str(), destination, sectionSize);
memset(reinterpret_cast<void *>(destination), 0, sectionSize);
}
if (endAddress < destination + sectionSize) {
endAddress = destination + sectionSize;
}
DCFlushRange((void *) destination, sectionSize);
ICInvalidateRange((void *) destination, sectionSize);
}
}
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)) {
DEBUG_FUNCTION_LINE("Linking (%d)... %s", i, psec->get_name().c_str());
if (!linkSection(reader, psec->get_index(), (uint32_t) destinations[psec->get_index()], offset_text, offset_data, trampoline_data, trampoline_data_length)) {
DEBUG_FUNCTION_LINE_ERR("elfLink failed");
free(destinations);
free(buffer);
return std::nullopt;
}
}
}
auto relocationData = getImportRelocationData(reader, destinations);
for (auto const &reloc : relocationData) {
moduleData->addRelocationData(reloc);
}
DCFlushRange((void *) baseOffset, totalSize);
ICInvalidateRange((void *) baseOffset, totalSize);
free(destinations);
free(buffer);
moduleData->setStartAddress(startAddress);
moduleData->setEndAddress(endAddress);
moduleData->setEntrypoint(entrypoint);
DEBUG_FUNCTION_LINE("Saved entrypoint as %08X", entrypoint);
return moduleData;
}
std::vector<std::shared_ptr<RelocationData>> ModuleDataFactory::getImportRelocationData(elfio &reader, uint8_t **destinations) {
std::vector<std::shared_ptr<RelocationData>> result;
std::map<uint32_t, std::string> infoMap;
uint32_t sec_num = reader.sections.size();
for (uint32_t i = 0; i < sec_num; ++i) {
section *psec = reader.sections[i];
if (psec->get_type() == 0x80000002) {
infoMap[i] = psec->get_name();
}
}
for (uint32_t i = 0; i < sec_num; ++i) {
section *psec = reader.sections[i];
if (psec->get_type() == SHT_RELA || psec->get_type() == SHT_REL) {
DEBUG_FUNCTION_LINE_VERBOSE("Found relocation section %s", psec->get_name().c_str());
relocation_section_accessor rel(reader, psec);
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_ERR("Failed to get relocation");
break;
}
// uint32_t adjusted_sym_value = (uint32_t) sym_value;
if (infoMap.count(sym_section_index) == 0) {
continue;
}
auto rplInfo = ImportRPLInformation::createImportRPLInformation(infoMap[sym_section_index]);
if (!rplInfo) {
DEBUG_FUNCTION_LINE_ERR("Failed to create import information");
break;
}
uint32_t section_index = psec->get_info();
// When these relocations are performed, we don't need the 0xC0000000 offset anymore.
auto relocationData = std::make_shared<RelocationData>(type, offset - 0x02000000, addend, (void *) (destinations[section_index] + 0x02000000), sym_name, rplInfo.value());
//relocationData->printInformation();
result.push_back(relocationData);
}
}
}
return result;
}
bool ModuleDataFactory::linkSection(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) {
uint32_t sec_num = reader.sections.size();
for (uint32_t i = 0; i < sec_num; ++i) {
section *psec = reader.sections[i];
if (psec->get_info() == section_index) {
DEBUG_FUNCTION_LINE_VERBOSE("Found relocation section %s", psec->get_name().c_str());
relocation_section_accessor rel(reader, psec);
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_ERR("Failed to get relocation");
break;
}
auto adjusted_sym_value = (uint32_t) sym_value;
if ((adjusted_sym_value >= 0x02000000) && adjusted_sym_value < 0x10000000) {
adjusted_sym_value -= 0x02000000;
adjusted_sym_value += base_text;
} else if ((adjusted_sym_value >= 0x10000000) && adjusted_sym_value < 0xC0000000) {
adjusted_sym_value -= 0x10000000;
adjusted_sym_value += base_data;
} else if (adjusted_sym_value >= 0xC0000000) {
// Skip imports
continue;
} else if (adjusted_sym_value == 0x0) {
//
} else {
DEBUG_FUNCTION_LINE_ERR("Unhandled case %08X", adjusted_sym_value);
return false;
}
if (sym_section_index == SHN_ABS) {
//
} else if (sym_section_index > SHN_LORESERVE) {
DEBUG_FUNCTION_LINE_ERR("NOT IMPLEMENTED: %04X", sym_section_index);
return false;
}
if (!ElfUtils::elfLinkOne(type, offset, addend, destination, adjusted_sym_value, trampoline_data, trampoline_data_length, RELOC_TYPE_FIXED)) {
DEBUG_FUNCTION_LINE_ERR("Link failed");
return false;
}
}
DEBUG_FUNCTION_LINE_VERBOSE("done");
}
}
return true;
}