libmwemu 0.24.1

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"), ins);

    assert!(ins.op_count() == 1 || ins.op_count() == 2);

    let value0 = match emu.get_operand_value(ins, 0, true) {
        Some(v) => v,
        None => return false,
    };

    if ins.op_count() == 1 {
        // 1 param

        let sz = emu.get_operand_sz(ins, 0);
        let result = match sz {
            64 => emu.flags_mut().shr1p64(value0),
            32 => emu.flags_mut().shr1p32(value0),
            16 => emu.flags_mut().shr1p16(value0),
            8 => emu.flags_mut().shr1p8(value0),
            _ => panic!("weird size"),
        };

        if !emu.set_operand_value(ins, 0, result) {
            return false;
        }
    } else {
        // 2 params

        let value1 = match emu.get_operand_value(ins, 1, true) {
            Some(v) => v,
            None => return false,
        };

        let sz = emu.get_operand_sz(ins, 0);
        let result = match sz {
            64 => emu.flags_mut().shr2p64(value0, value1),
            32 => emu.flags_mut().shr2p32(value0, value1),
            16 => emu.flags_mut().shr2p16(value0, value1),
            8 => emu.flags_mut().shr2p8(value0, value1),
            _ => panic!("weird size"),
        };

        //log::trace!("0x{:x} SHR 0x{:x} >> 0x{:x} = 0x{:x}", ins.ip32(), value0, value1, result);

        if !emu.set_operand_value(ins, 0, result) {
            return false;
        }
    }
    true
}