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

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Example 1

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;
		}
	}
}