libmwemu 0.25.2

x86 32/64bits and system internals emulator, for securely emulating malware and other stuff.
Documentation 
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use crate::color;
use crate::emu::Emu;
use iced_x86::Instruction;

pub fn execute(emu: &mut Emu, ins: &Instruction, instruction_sz: usize, _rep_step: bool) -> bool {
    emu.show_instruction(color!("Green"), &crate::emu::decoded_instruction::DecodedInstruction::X86(*ins));
    assert!(ins.op_count() == 2);

    let sz0 = emu.get_operand_sz(ins, 0);

    if sz0 == 128 {
        // `movhps xmm, m64`: load the high quadword of the xmm from memory,
        // keeping the low quadword. The memory operand is ALWAYS 64-bit;
        // `get_operand_sz` sometimes misreports it as 32, which previously made
        // us read only 32 bits and place them at bits [127:96] — corrupting the
        // high qword (e.g. a pointer became 0xVAL00000000). So read a qword
        // explicitly from the source address, like `movlps` does.
        let value0 = match emu.get_operand_xmm_value_128(ins, 0, false) {
            Some(v) => v,
            None => {
                log::trace!("error getting xmm value0");
                return false;
            }
        };
        let addr = match emu.get_operand_value(ins, 1, false) {
            Some(v) => v,
            None => {
                log::trace!("error getting movhps source address");
                return false;
            }
        };
        let value1 = match emu.maps.read_qword(addr) {
            Some(v) => v,
            None => {
                log::trace!("error reading movhps source qword at 0x{:x}", addr);
                return false;
            }
        };

        // keep low 64 bits of the destination, replace the high 64 bits.
        let result = (value0 & 0x0000000000000000_FFFFFFFFFFFFFFFFu128) | ((value1 as u128) << 64);
        emu.set_operand_xmm_value_128(ins, 0, result);
    } else {
        // `movhps m64, xmm`: store the high quadword of the xmm to memory (64-bit).
        let value1 = match emu.get_operand_xmm_value_128(ins, 1, true) {
            Some(v) => v,
            None => {
                log::trace!("error getting xmm value1");
                return false;
            }
        };
        let high = (value1 >> 64) as u64;
        let addr = match emu.get_operand_value(ins, 0, false) {
            Some(v) => v,
            None => {
                log::trace!("error getting movhps destination address");
                return false;
            }
        };
        emu.maps.write_qword(addr, high);
    }
    true
}