Function DecodeAddrMode3Instruction

arch/ARM/ARMDisassembler.c:1758–1978

}

static DecodeStatus DecodeAddrMode3Instruction(MCInst *Inst, unsigned Insn,
		uint64_t Address, const void *Decoder)
{
	DecodeStatus S = MCDisassembler_Success;

	unsigned Rt = fieldFromInstruction_4(Insn, 12, 4);
	unsigned Rn = fieldFromInstruction_4(Insn, 16, 4);
	unsigned Rm = fieldFromInstruction_4(Insn, 0, 4);
	unsigned type = fieldFromInstruction_4(Insn, 22, 1);
	unsigned imm = fieldFromInstruction_4(Insn, 8, 4);
	unsigned U = ((~fieldFromInstruction_4(Insn, 23, 1)) & 1) << 8;
	unsigned pred = fieldFromInstruction_4(Insn, 28, 4);
	unsigned W = fieldFromInstruction_4(Insn, 21, 1);
	unsigned P = fieldFromInstruction_4(Insn, 24, 1);
	unsigned Rt2 = Rt + 1;

	bool writeback = (W == 1) | (P == 0);

	// For {LD,ST}RD, Rt must be even, else undefined.
	switch (MCInst_getOpcode(Inst)) {
		case ARM_STRD:
		case ARM_STRD_PRE:
		case ARM_STRD_POST:
		case ARM_LDRD:
		case ARM_LDRD_PRE:
		case ARM_LDRD_POST:
			if (Rt & 0x1)
				S = MCDisassembler_SoftFail;
			break;
		default:
			break;
	}

	switch (MCInst_getOpcode(Inst)) {
		case ARM_STRD:
		case ARM_STRD_PRE:
		case ARM_STRD_POST:
			if (P == 0 && W == 1)
				S = MCDisassembler_SoftFail;

			if (writeback && (Rn == 15 || Rn == Rt || Rn == Rt2))
				S = MCDisassembler_SoftFail;

			if (type && Rm == 15)
				S = MCDisassembler_SoftFail;

			if (Rt2 == 15)
				S = MCDisassembler_SoftFail;

			if (!type && fieldFromInstruction_4(Insn, 8, 4))
				S = MCDisassembler_SoftFail;

			break;

		case ARM_STRH:
		case ARM_STRH_PRE:
		case ARM_STRH_POST:
			if (Rt == 15)