libmwemu 0.24.5

x86 32/64bits and system internals emulator, for securely emulating malware and other stuff.
Documentation 
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use crate::emu::Emu;
use yaxpeax_arm::armv8::a64::Instruction;

use super::super::helpers::*;

pub fn execute(emu: &mut Emu, ins: &Instruction, op: ShiftOp) -> bool {
    let is64 = operand_is_64(&ins.operands[0]);
    let a = read_operand_value(emu, &ins.operands[1]);
    let b = read_operand_value(emu, &ins.operands[2]);
    let shift = if is64 { b & 63 } else { b & 31 };
    let result = match op {
        ShiftOp::Lsl => a << shift,
        ShiftOp::Lsr => if is64 { a >> shift } else { ((a as u32) >> shift) as u64 },
        ShiftOp::Asr => if is64 { ((a as i64) >> shift) as u64 } else { ((a as i32) >> (shift as u32)) as u32 as u64 },
        ShiftOp::Ror => if is64 { a.rotate_right(shift as u32) } else { ((a as u32).rotate_right(shift as u32)) as u64 },
    };
    let result = if is64 { result } else { result & 0xffffffff };
    write_reg(emu, &ins.operands[0], result);
    true
}