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WUMSLoader/source/module/ModuleDataFactory.cpp

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/****************************************************************************
* Copyright (C) 2018 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 <string>
#include <vector>
#include <map>
#include <coreinit/cache.h>
#include <wums.h>
#include "ModuleDataFactory.h"
#include "utils/utils.h"
#include "ElfUtils.h"
using namespace ELFIO;
std::optional<ModuleData> ModuleDataFactory::load(const std::string& path, uint32_t *destination_address_ptr, uint32_t maximum_size, relocation_trampolin_entry_t *trampolin_data, uint32_t trampolin_data_length) {
elfio reader;
ModuleData moduleData;
// Load ELF data
if (!reader.load(path)) {
DEBUG_FUNCTION_LINE("Can't find or process %s", path.c_str());
return std::nullopt;
}
uint32_t sec_num = reader.sections.size();
auto **destinations = (uint8_t **) malloc(sizeof(uint8_t *) * sec_num);
uint32_t baseOffset = *destination_address_ptr;
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("Couldn't load setup module because it's too big.");
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("Unhandled case");
free(destinations);
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") {
moduleData.setBSSLocation(destination, sectionSize);
memset(reinterpret_cast<void *>(destination), 0, sectionSize);
} else if (psec->get_name() == ".sbss") {
moduleData.setSBSSLocation(destination, sectionSize);
memset(reinterpret_cast<void *>(destination), 0, sectionSize);
}
moduleData.addSectionInfo(SectionInfo(psec->get_name(), destination, sectionSize));
DEBUG_FUNCTION_LINE("Saved %s section info. Location: %08X size: %08X", psec->get_name().c_str(), destination, 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, trampolin_data, trampolin_data_length)) {
DEBUG_FUNCTION_LINE("elfLink failed");
free(destinations);
return std::nullopt;
}
}
}
std::vector<RelocationData> relocationData = getImportRelocationData(reader, destinations);
for (auto const &reloc : relocationData) {
moduleData.addRelocationData(reloc);
}
std::optional<SectionInfo> secInfo = moduleData.getSectionInfo(".wums.exports");
if (secInfo && secInfo->getSize() > 0) {
size_t entries_count = secInfo->getSize() / sizeof(wums_entry_t);
auto *entries = (wums_entry_t *) secInfo->getAddress();
if (entries != nullptr) {
for (size_t j = 0; j < entries_count; j++) {
wums_entry_t *exp = &entries[j];
DEBUG_FUNCTION_LINE("Saving export of type %08X, name %s, target: %08X"/*,pluginData.getPluginInformation()->getName().c_str()*/, exp->type, exp->name, (void *) exp->address);
ExportData export_data(exp->type, exp->name, exp->address);
moduleData.addExportData(export_data);
}
}
}
secInfo = moduleData.getSectionInfo(".wums.hooks");
if (secInfo && secInfo->getSize() > 0) {
size_t entries_count = secInfo->getSize() / sizeof(wums_hook_t);
auto *hooks = (wums_hook_t *) secInfo->getAddress();
if (hooks != nullptr) {
for (size_t j = 0; j < entries_count; j++) {
wums_hook_t *hook = &hooks[j];
DEBUG_FUNCTION_LINE("Saving hook of type %08X, target: %08X"/*,pluginData.getPluginInformation()->getName().c_str()*/, hook->type, hook->target);
HookData hook_data(hook->type, hook->target);
moduleData.addHookData(hook_data);
}
}
}
secInfo = moduleData.getSectionInfo(".wums.meta");
if (secInfo && secInfo->getSize() > 0) {
auto *entries = (wums_entry_t *) secInfo->getAddress();
if (entries != nullptr) {
char *curEntry = (char *) secInfo->getAddress();
while ((uint32_t) curEntry < (uint32_t) secInfo->getAddress() + secInfo->getSize()) {
if (*curEntry == '\0') {
curEntry++;
continue;
}
auto firstFound = std::string(curEntry).find_first_of('=');
if (firstFound != std::string::npos) {
curEntry[firstFound] = '\0';
std::string key(curEntry);
std::string value(curEntry + firstFound + 1);
if (key == "export_name") {
DEBUG_FUNCTION_LINE("export_name = %s", value.c_str());
moduleData.setExportName(value);
} else if (key == "skipEntrypoint") {
if (value == "true") {
DEBUG_FUNCTION_LINE("skipEntrypoint = %s", value.c_str());
moduleData.setSkipEntrypoint(true);
} else {
moduleData.setSkipEntrypoint(false);
}
} else if (key == "initBeforeRelocationDoneHook") {
if (value == "true") {
DEBUG_FUNCTION_LINE("initBeforeRelocationDoneHook = %s", value.c_str());
moduleData.setInitBeforeRelocationDoneHook(true);
} else {
moduleData.setInitBeforeRelocationDoneHook(false);
}
} else if (key == "wums") {
if (value != "0.2") {
DEBUG_FUNCTION_LINE("Warning: Ignoring module - Unsupported WUMS version: %s.\n", value.c_str());
return std::nullopt;
}
}
}
curEntry += strlen(curEntry) + 1;
}
}
}
DCFlushRange((void *) *destination_address_ptr, totalSize);
ICInvalidateRange((void *) *destination_address_ptr, totalSize);
free(destinations);
moduleData.setEntrypoint(entrypoint);
moduleData.setStartAddress(*destination_address_ptr);
moduleData.setEndAddress(endAddress);
DEBUG_FUNCTION_LINE("Saved entrypoint as %08X", entrypoint);
DEBUG_FUNCTION_LINE("Saved startAddress as %08X", *destination_address_ptr);
DEBUG_FUNCTION_LINE("Saved endAddress as %08X", endAddress);
*destination_address_ptr = (*destination_address_ptr + totalSize + 0x100) & 0xFFFFFF00;
return moduleData;
}
std::vector<RelocationData> ModuleDataFactory::getImportRelocationData(elfio &reader, uint8_t **destinations) {
std::vector<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("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("Failed to get relocation");
break;
}
// uint32_t adjusted_sym_value = (uint32_t) sym_value;
if (infoMap.count(sym_section_index) == 0) {
continue;
}
std::optional<ImportRPLInformation> rplInfo = ImportRPLInformation::createImportRPLInformation(infoMap[sym_section_index]);
if (!rplInfo) {
DEBUG_FUNCTION_LINE("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.
RelocationData 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_trampolin_entry_t *trampolin_data, uint32_t trampolin_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("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("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("Unhandled case %08X", adjusted_sym_value);
return false;
}
if (sym_section_index == SHN_ABS) {
//
} else if (sym_section_index > SHN_LORESERVE) {
DEBUG_FUNCTION_LINE("NOT IMPLEMENTED: %04X", sym_section_index);
return false;
}
if (!ElfUtils::elfLinkOne(type, offset, addend, destination, adjusted_sym_value, trampolin_data, trampolin_data_length, RELOC_TYPE_FIXED)) {
DEBUG_FUNCTION_LINE("Link failed");
return false;
}
}
DEBUG_FUNCTION_LINE("done");
}
}
return true;
}
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