Java Code Examples for ghidra.program.model.mem.Memory#setInt()

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Example 1

Source File: RelocationFixupHandler.java From ghidra with Apache License 2.0

6 votes

protected boolean process32BitRelocation(Program program, Relocation relocation,
		Address oldImageBase, Address newImageBase) throws MemoryAccessException,
		CodeUnitInsertionException {
	long diff = newImageBase.subtract(oldImageBase);

	Address address = relocation.getAddress();
	Memory memory = program.getMemory();
	int value = memory.getInt(address);
	int newValue = (int) (value + diff);

	InstructionStasher instructionStasher = new InstructionStasher(program, address);

	memory.setInt(address, newValue);

	instructionStasher.restore();

	return true;
}

Example 2

Source File: PIC30_ElfRelocationHandler.java From ghidra with Apache License 2.0

4 votes

@Override
public void relocate(ElfRelocationContext elfRelocationContext, ElfRelocation relocation, Address relocationAddress)
		throws MemoryAccessException, NotFoundException {

	int type = relocation.getType();
	if (type == R_PIC30_NONE) {
		return;
	}

	Program program = elfRelocationContext.getProgram();
	Memory memory = program.getMemory();

	int symbolIndex = relocation.getSymbolIndex();

	int addend = (int) relocation.getAddend();

	if (symbolIndex == 0) {// TODO
		return;
	}

	long relocWordOffset = (int) relocationAddress.getAddressableWordOffset();

	ElfSymbol sym = elfRelocationContext.getSymbol(symbolIndex);
	int symbolValue = (int) elfRelocationContext.getSymbolValue(sym); // word offset

	int oldValue = memory.getInt(relocationAddress);
	short oldShortValue = memory.getShort(relocationAddress);

	int newValue;

	ElfHeader elf = elfRelocationContext.getElfHeader();
	if (elf.e_machine() == ElfConstants.EM_DSPIC30F) {
		switch (type) {
		case R_PIC30_16: // 2
			newValue = (symbolValue + addend + oldShortValue) & 0xffff;
			memory.setShort(relocationAddress, (short) newValue);
			break;
		case R_PIC30_32: // 3
			newValue = symbolValue + addend + oldValue;
			memory.setInt(relocationAddress, newValue);
			break;
		case R_PIC30_FILE_REG_WORD_WITH_DST: // 7
			int reloc = symbolValue >> 1;
			reloc += addend;
			reloc += oldValue >> 4;
			reloc &= 0x7fff;
			newValue = (reloc << 4) | (oldValue & ~0x7fff0);
			memory.setInt(relocationAddress, newValue);
			break;
		case R_PIC30_WORD: // 8
		case R_PIC30_WORD_TBLOFFSET: // 0x15
			reloc = symbolValue;
			reloc += addend;
			reloc += oldValue >> 4;
			reloc &= 0xffff;
			newValue = (reloc << 4) | (oldValue & ~0x0ffff0);
			memory.setInt(relocationAddress, newValue);
			break;
		case R_PIC30_WORD_TBLPAGE: // 0x18
			reloc = symbolValue >> 16;
			reloc += addend;
			reloc += oldValue >> 4;
			reloc &= 0xffff;
			if (isEDSVariant(elfRelocationContext)) {
				reloc |= 0x100;
			}
			newValue = (reloc << 4) | (oldValue & ~0x0ffff0);
			memory.setInt(relocationAddress, newValue);
			break;
		case R_PIC30_PCREL_BRANCH: // 0x1c
			newValue = (int) (symbolValue - relocWordOffset + oldShortValue - 2);
			newValue >>>= 1;
			memory.setShort(relocationAddress, (short) (newValue & 0xffff));
			break;
		default:
			String symbolName = sym.getNameAsString();
			markAsUnhandled(program, relocationAddress, type, symbolIndex, symbolName,
					elfRelocationContext.getLog());
			break;
		}
	}
}

Example 3

Source File: SPARC_ElfRelocationHandler.java From ghidra with Apache License 2.0

4 votes

@Override
public void relocate(ElfRelocationContext elfRelocationContext, ElfRelocation relocation,
		Address relocationAddress) throws MemoryAccessException, NotFoundException {

	ElfHeader elf = elfRelocationContext.getElfHeader();
	if (elf.e_machine() != ElfConstants.EM_SPARC &&
		elf.e_machine() != ElfConstants.EM_SPARC32PLUS) {
		return;
	}

	Program program = elfRelocationContext.getProgram();
	Memory memory = program.getMemory();

	int type = relocation.getType();
	if (type == SPARC_ElfRelocationConstants.R_SPARC_NONE) {
		return;
	}

	int symbolIndex = relocation.getSymbolIndex();

	long addend = relocation.getAddend(); // will be 0 for REL case

	long offset = (int) relocationAddress.getOffset();

	ElfSymbol sym = elfRelocationContext.getSymbol(symbolIndex);
	String symbolName = sym != null ? sym.getNameAsString() : null;

	long symbolValue = elfRelocationContext.getSymbolValue(sym);

	int oldValue = memory.getInt(relocationAddress);
	int newValue = 0;

	switch (type) {
		case SPARC_ElfRelocationConstants.R_SPARC_DISP32:
			newValue = (int) (symbolValue + addend - offset);
			memory.setInt(relocationAddress, oldValue | newValue);
			break;
		case SPARC_ElfRelocationConstants.R_SPARC_WDISP30:
			newValue = (int) (symbolValue + addend - offset) >>> 2;
			memory.setInt(relocationAddress, oldValue | newValue);
			break;
		case SPARC_ElfRelocationConstants.R_SPARC_HI22:
			newValue = ((int) symbolValue + (int) addend) >>> 10;
			memory.setInt(relocationAddress, oldValue | newValue);
			break;
		case SPARC_ElfRelocationConstants.R_SPARC_LO10:
			newValue = ((int) symbolValue + (int) addend) & 0x3FF;
			memory.setInt(relocationAddress, oldValue | newValue);
			break;
		case SPARC_ElfRelocationConstants.R_SPARC_JMP_SLOT:
			// should copy address of symbol in EXTERNAL block
		case SPARC_ElfRelocationConstants.R_SPARC_32:
			newValue = (int) symbolValue + (int) addend;
			memory.setInt(relocationAddress, newValue);
			break;
		// we punt on this because it's not linked yet!
		case SPARC_ElfRelocationConstants.R_SPARC_GLOB_DAT:
			newValue = (int) symbolValue;
			memory.setInt(relocationAddress, newValue);
			break;
		case SPARC_ElfRelocationConstants.R_SPARC_RELATIVE:
			newValue = (int) elf.getImageBase() + (int) addend;
			memory.setInt(relocationAddress, newValue);
			break;
		case SPARC_ElfRelocationConstants.R_SPARC_UA32:
			newValue = (int) symbolValue + (int) addend;
			memory.setInt(relocationAddress, newValue);
			break;
		case SPARC_ElfRelocationConstants.R_SPARC_COPY:
			markAsWarning(program, relocationAddress, "R_SPARC_COPY", symbolName, symbolIndex,
				"Runtime copy not supported", elfRelocationContext.getLog());
			break;
		default:
			markAsUnhandled(program, relocationAddress, type, symbolIndex, symbolName,
				elfRelocationContext.getLog());
			break;
	}
}