libmwemu 0.24.1

x86 32/64bits and system internals emulator, for securely emulating malware and other stuff.
Documentation 
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//! Tests for the FIMUL instruction.
//!
//! FIMUL - Multiply integer with floating-point (m16int and m32int)
//!
//! Reference: /Users/int/dev/rax/docs/fmul:fmulp:fimul.txt
//!
//! Opcode: DE /1 - FIMUL m16int  ; ST(0) = ST(0) * m16int
//! Opcode: DA /1 - FIMUL m32int  ; ST(0) = ST(0) * m32int

use crate::*;

const DATA_ADDR: u64 = 0x2000;

fn write_f64(mem: u64, addr: u64, value: f64) {
    let mut emu = emu64();    emu.maps.write_bytes_slice(addr, &value.to_le_bytes());
}

fn write_i16(mem: u64, addr: u64, value: i16) {
    let mut emu = emu64();    emu.maps.write_bytes_slice(addr, &value.to_le_bytes());
}

fn write_i32(mem: u64, addr: u64, value: i32) {
    let mut emu = emu64();    emu.maps.write_bytes_slice(addr, &value.to_le_bytes());
}

fn read_f64(mem: u64, addr: u64) -> f64 {
    let emu = emu64();    let mut buf = [0u8; 8];
    emu.maps.read_bytes_buff(&mut buf, addr);
    f64::from_le_bytes(buf)
}

// FIMUL m16int tests
#[test]
fn test_fimul_m16int_basic() {
    let mut emu = emu64();    let code = [
        0xDD, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00, // FLD qword [0x2000]
        0xDE, 0x0C, 0x25, 0x08, 0x20, 0x00, 0x00, // FIMUL word [0x2008]
        0xDD, 0x1C, 0x25, 0x00, 0x30, 0x00, 0x00, // FSTP qword [0x3000]
        0xf4,
    ];
    emu.load_code_bytes(&code);
    emu.maps.write_f64(DATA_ADDR, 2.5);
    emu.maps.write_word(DATA_ADDR + 8, (4) as i16 as u16);

    emu.run(None).unwrap();
    assert_eq!(emu.maps.read_f64(0x3000).unwrap(), 10.0);
}

#[test]
fn test_fimul_m16int_negative() {
    let mut emu = emu64();    let code = [
        0xDD, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0xDE, 0x0C, 0x25, 0x08, 0x20, 0x00, 0x00,
        0xDD, 0x1C, 0x25, 0x00, 0x30, 0x00, 0x00,
        0xf4,
    ];
    emu.load_code_bytes(&code);
    emu.maps.write_f64(DATA_ADDR, 3.0);
    emu.maps.write_word(DATA_ADDR + 8, (-5) as i16 as u16);

    emu.run(None).unwrap();
    assert_eq!(emu.maps.read_f64(0x3000).unwrap(), -15.0);
}

#[test]
fn test_fimul_m16int_zero() {
    let mut emu = emu64();    let code = [
        0xDD, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0xDE, 0x0C, 0x25, 0x08, 0x20, 0x00, 0x00,
        0xDD, 0x1C, 0x25, 0x00, 0x30, 0x00, 0x00,
        0xf4,
    ];
    emu.load_code_bytes(&code);
    emu.maps.write_f64(DATA_ADDR, 999.999);
    emu.maps.write_word(DATA_ADDR + 8, (0) as i16 as u16);

    emu.run(None).unwrap();
    let result = emu.maps.read_f64(0x3000).unwrap();
    assert_eq!(result, 0.0);
    assert!(!result.is_sign_negative());
}

#[test]
fn test_fimul_m16int_one() {
    let mut emu = emu64();    let code = [
        0xDD, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0xDE, 0x0C, 0x25, 0x08, 0x20, 0x00, 0x00,
        0xDD, 0x1C, 0x25, 0x00, 0x30, 0x00, 0x00,
        0xf4,
    ];
    emu.load_code_bytes(&code);
    emu.maps.write_f64(DATA_ADDR, 123.456);
    emu.maps.write_word(DATA_ADDR + 8, (1) as i16 as u16);

    emu.run(None).unwrap();
    assert_eq!(emu.maps.read_f64(0x3000).unwrap(), 123.456);
}

#[test]
fn test_fimul_m16int_max() {
    let mut emu = emu64();    let code = [
        0xDD, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0xDE, 0x0C, 0x25, 0x08, 0x20, 0x00, 0x00,
        0xDD, 0x1C, 0x25, 0x00, 0x30, 0x00, 0x00,
        0xf4,
    ];
    emu.load_code_bytes(&code);
    emu.maps.write_f64(DATA_ADDR, 2.0);
    emu.maps.write_word(DATA_ADDR + 8, (i16::MAX) as i16 as u16);

    emu.run(None).unwrap();
    assert_eq!(emu.maps.read_f64(0x3000).unwrap(), 2.0 * i16::MAX as f64);
}

#[test]
fn test_fimul_m16int_min() {
    let mut emu = emu64();    let code = [
        0xDD, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0xDE, 0x0C, 0x25, 0x08, 0x20, 0x00, 0x00,
        0xDD, 0x1C, 0x25, 0x00, 0x30, 0x00, 0x00,
        0xf4,
    ];
    emu.load_code_bytes(&code);
    emu.maps.write_f64(DATA_ADDR, 2.0);
    emu.maps.write_word(DATA_ADDR + 8, (i16::MIN) as i16 as u16);

    emu.run(None).unwrap();
    assert_eq!(emu.maps.read_f64(0x3000).unwrap(), 2.0 * i16::MIN as f64);
}

#[test]
fn test_fimul_m16int_fractional() {
    let mut emu = emu64();    let code = [
        0xDD, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0xDE, 0x0C, 0x25, 0x08, 0x20, 0x00, 0x00,
        0xDD, 0x1C, 0x25, 0x00, 0x30, 0x00, 0x00,
        0xf4,
    ];
    emu.load_code_bytes(&code);
    emu.maps.write_f64(DATA_ADDR, 0.125);
    emu.maps.write_word(DATA_ADDR + 8, (8) as i16 as u16);

    emu.run(None).unwrap();
    assert_eq!(emu.maps.read_f64(0x3000).unwrap(), 1.0);
}

// FIMUL m32int tests
#[test]
fn test_fimul_m32int_basic() {
    let mut emu = emu64();    let code = [
        0xDD, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0xDA, 0x0C, 0x25, 0x08, 0x20, 0x00, 0x00, // FIMUL dword [0x2008]
        0xDD, 0x1C, 0x25, 0x00, 0x30, 0x00, 0x00,
        0xf4,
    ];
    emu.load_code_bytes(&code);
    emu.maps.write_f64(DATA_ADDR, 1.5);
    emu.maps.write_dword(DATA_ADDR + 8, (1000) as i32 as u32);

    emu.run(None).unwrap();
    assert_eq!(emu.maps.read_f64(0x3000).unwrap(), 1500.0);
}

#[test]
fn test_fimul_m32int_negative() {
    let mut emu = emu64();    let code = [
        0xDD, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0xDA, 0x0C, 0x25, 0x08, 0x20, 0x00, 0x00,
        0xDD, 0x1C, 0x25, 0x00, 0x30, 0x00, 0x00,
        0xf4,
    ];
    emu.load_code_bytes(&code);
    emu.maps.write_f64(DATA_ADDR, -2.5);
    emu.maps.write_dword(DATA_ADDR + 8, (100) as i32 as u32);

    emu.run(None).unwrap();
    assert_eq!(emu.maps.read_f64(0x3000).unwrap(), -250.0);
}

#[test]
fn test_fimul_m32int_zero() {
    let mut emu = emu64();    let code = [
        0xDD, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0xDA, 0x0C, 0x25, 0x08, 0x20, 0x00, 0x00,
        0xDD, 0x1C, 0x25, 0x00, 0x30, 0x00, 0x00,
        0xf4,
    ];
    emu.load_code_bytes(&code);
    emu.maps.write_f64(DATA_ADDR, 999.999);
    emu.maps.write_dword(DATA_ADDR + 8, (0) as i32 as u32);

    emu.run(None).unwrap();
    let result = emu.maps.read_f64(0x3000).unwrap();
    assert_eq!(result, 0.0);
    assert!(!result.is_sign_negative());
}

#[test]
fn test_fimul_m32int_large() {
    let mut emu = emu64();    let code = [
        0xDD, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0xDA, 0x0C, 0x25, 0x08, 0x20, 0x00, 0x00,
        0xDD, 0x1C, 0x25, 0x00, 0x30, 0x00, 0x00,
        0xf4,
    ];
    emu.load_code_bytes(&code);
    emu.maps.write_f64(DATA_ADDR, 0.001);
    emu.maps.write_dword(DATA_ADDR + 8, (1000000) as i32 as u32);

    emu.run(None).unwrap();
    assert_eq!(emu.maps.read_f64(0x3000).unwrap(), 1000.0);
}

#[test]
fn test_fimul_m32int_max() {
    let mut emu = emu64();    let code = [
        0xDD, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0xDA, 0x0C, 0x25, 0x08, 0x20, 0x00, 0x00,
        0xDD, 0x1C, 0x25, 0x00, 0x30, 0x00, 0x00,
        0xf4,
    ];
    emu.load_code_bytes(&code);
    emu.maps.write_f64(DATA_ADDR, 2.0);
    emu.maps.write_dword(DATA_ADDR + 8, (i32::MAX) as i32 as u32);

    emu.run(None).unwrap();
    assert_eq!(emu.maps.read_f64(0x3000).unwrap(), 2.0 * i32::MAX as f64);
}

#[test]
fn test_fimul_m32int_commutative() {
    let mut emu = emu64();    let code = [
        0xDD, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0xDA, 0x0C, 0x25, 0x08, 0x20, 0x00, 0x00,
        0xDD, 0x1C, 0x25, 0x00, 0x30, 0x00, 0x00,
        0xf4,
    ];
    emu.load_code_bytes(&code);
    emu.maps.write_f64(DATA_ADDR, 123.456);
    emu.maps.write_dword(DATA_ADDR + 8, (10) as i32 as u32);

    emu.run(None).unwrap();
    assert_eq!(emu.maps.read_f64(0x3000).unwrap(), 1234.56);
}

#[test]
fn test_fimul_chain() {
    let mut emu = emu64();    let code = [
        0xDD, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00, // FLD 2.0
        0xDA, 0x0C, 0x25, 0x08, 0x20, 0x00, 0x00, // FIMUL 3
        0xDA, 0x0C, 0x25, 0x0C, 0x20, 0x00, 0x00, // FIMUL 4
        0xDA, 0x0C, 0x25, 0x10, 0x20, 0x00, 0x00, // FIMUL 5
        0xDD, 0x1C, 0x25, 0x00, 0x30, 0x00, 0x00,
        0xf4,
    ];
    emu.load_code_bytes(&code);
    emu.maps.write_f64(DATA_ADDR, 2.0);
    emu.maps.write_dword(DATA_ADDR + 8, (3) as i32 as u32);
    emu.maps.write_dword(DATA_ADDR + 12, (4) as i32 as u32);
    emu.maps.write_dword(DATA_ADDR + 16, (5) as i32 as u32);

    emu.run(None).unwrap();
    assert_eq!(emu.maps.read_f64(0x3000).unwrap(), 120.0); // 2 * 3 * 4 * 5
}

#[test]
fn test_fimul_infinity() {
    let mut emu = emu64();    let code = [
        0xDD, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0xDA, 0x0C, 0x25, 0x08, 0x20, 0x00, 0x00,
        0xDD, 0x1C, 0x25, 0x00, 0x30, 0x00, 0x00,
        0xf4,
    ];
    emu.load_code_bytes(&code);
    emu.maps.write_f64(DATA_ADDR, f64::INFINITY);
    emu.maps.write_dword(DATA_ADDR + 8, (5) as i32 as u32);

    emu.run(None).unwrap();
    let result = emu.maps.read_f64(0x3000).unwrap();
    assert!(result.is_infinite() && result.is_sign_positive());
}

#[test]
fn test_fimul_neg_infinity() {
    let mut emu = emu64();    let code = [
        0xDD, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0xDA, 0x0C, 0x25, 0x08, 0x20, 0x00, 0x00,
        0xDD, 0x1C, 0x25, 0x00, 0x30, 0x00, 0x00,
        0xf4,
    ];
    emu.load_code_bytes(&code);
    emu.maps.write_f64(DATA_ADDR, f64::NEG_INFINITY);
    emu.maps.write_dword(DATA_ADDR + 8, (5) as i32 as u32);

    emu.run(None).unwrap();
    let result = emu.maps.read_f64(0x3000).unwrap();
    assert!(result.is_infinite() && result.is_sign_negative());
}

#[test]
fn test_fimul_negative_int_pos_infinity() {
    let mut emu = emu64();    let code = [
        0xDD, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0xDA, 0x0C, 0x25, 0x08, 0x20, 0x00, 0x00,
        0xDD, 0x1C, 0x25, 0x00, 0x30, 0x00, 0x00,
        0xf4,
    ];
    emu.load_code_bytes(&code);
    emu.maps.write_f64(DATA_ADDR, f64::INFINITY);
    emu.maps.write_dword(DATA_ADDR + 8, (-5) as i32 as u32);

    emu.run(None).unwrap();
    let result = emu.maps.read_f64(0x3000).unwrap();
    assert!(result.is_infinite() && result.is_sign_negative());
}