WUMSLoader/source/module/ModuleDataFactory.cpp

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2020-04-28 14:43:07 +02:00
/****************************************************************************
* 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 "ModuleDataFactory.h"
#include "elfio/elfio.hpp"
#include "utils/utils.h"
#include "ElfUtils.h"
using namespace ELFIO;
ModuleData * ModuleDataFactory::load(std::string path, uint32_t destination_address, uint32_t maximum_size, relocation_trampolin_entry_t * trampolin_data, uint32_t trampolin_data_length) {
elfio reader;
ModuleData * moduleData = new ModuleData();
if(moduleData == NULL) {
return NULL;
}
// Load ELF data
if (!reader.load(path)) {
DEBUG_FUNCTION_LINE("Can't find or process %s", path.c_str());
delete moduleData;
return NULL;
}
uint32_t sec_num = reader.sections.size();
uint8_t **destinations = (uint8_t **) malloc(sizeof(uint8_t *) * sec_num);
uint32_t baseOffset = destination_address;
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;
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();
uint32_t 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);
delete moduleData;
return NULL;
}
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().compare(".bss") == 0) {
moduleData->setBSSLocation(destination, sectionSize);
DEBUG_FUNCTION_LINE("Saved %s section info. Location: %08X size: %08X", psec->get_name().c_str(), destination, sectionSize);
} else if(psec->get_name().compare(".sbss") == 0) {
moduleData->setSBSSLocation(destination, sectionSize);
DEBUG_FUNCTION_LINE("Saved %s section info. Location: %08X size: %08X", psec->get_name().c_str(), destination, sectionSize);
}
totalSize += 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);
delete moduleData;
return NULL;
}
}
}
std::vector<RelocationData*> relocationData = getImportRelocationData(reader, destinations);
for (auto const& reloc : relocationData) {
moduleData->addRelocationData(reloc);
}
DCFlushRange((void*)destination_address, totalSize);
ICInvalidateRange((void*)destination_address, totalSize);
free(destinations);
moduleData->setEntrypoint(entrypoint);
moduleData->setAddress(destination_address);
moduleData->setSize(totalSize);
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DEBUG_FUNCTION_LINE("Saved entrypoint as %08X", entrypoint);
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(adjusted_sym_value < 0xC0000000) {
continue;
}
ImportRPLInformation * rplInfo = ImportRPLInformation::createImportRPLInformation(infoMap[sym_section_index]);
if(rplInfo == NULL) {
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 = new RelocationData(type, offset - 0x02000000, addend, (void*)(destinations[section_index] + 0x02000000), sym_name, rplInfo);
//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;
}
uint32_t 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;
}