libmwemu 0.24.0

x86 32/64bits and system internals emulator, for securely emulating malware and other stuff.
Documentation 
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//! Tests for PMAXSW instruction (MMX).
//!
//! PMAXSW - Maximum of Packed Signed Word Integers (MMX)
//!
//! Compares packed signed word integers and returns maximum values.
//!
//! Opcode: 0F EE /r
//!
//! Flags affected: None
//!
//! Reference: /Users/int/dev/rax/docs/pmaxsb:pmaxsw:pmaxsd:pmaxsq.txt

use crate::*;

fn write_mm_via_mem(mem: u64, addr: u64, value: u64) {
    let mut emu = emu64();
    emu.maps.write_qword(addr, value);
}

#[test]
fn test_pmaxsw_basic() {
    let mut emu = emu64();
    let code = vec![
        0x0f, 0x6f, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00, // MOVQ MM0, [0x2000]
        0x0f, 0x6f, 0x0c, 0x25, 0x08, 0x20, 0x00, 0x00, // MOVQ MM1, [0x2008]
        0x0f, 0xee, 0xc1,                               // PMAXSW MM0, MM1
        0x0f, 0x7f, 0x04, 0x25, 0x10, 0x20, 0x00, 0x00, // MOVQ [0x2010], MM0
        0xf4,
    ];

    emu.load_code_bytes(&code);

    emu.maps.write_qword(0x2000, 0x0064003200190005);
    emu.maps.write_qword(0x2008, 0x00C8006400320014);

    emu.run(None).unwrap();

    let result = emu.maps.read_qword(0x2010).unwrap();
    assert_eq!(result, 0x00C8006400320014, "PMAXSW: basic maximum");
}

#[test]
fn test_pmaxsw_all_positive() {
    let mut emu = emu64();
    let code = vec![
        0x0f, 0x6f, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0x0f, 0x6f, 0x0c, 0x25, 0x08, 0x20, 0x00, 0x00,
        0x0f, 0xee, 0xc1,
        0x0f, 0x7f, 0x04, 0x25, 0x10, 0x20, 0x00, 0x00,
        0xf4,
    ];

    emu.load_code_bytes(&code);

    emu.maps.write_qword(0x2000, 0x7FFF7FFE7FFD7FFC);
    emu.maps.write_qword(0x2008, 0x7FFB7FFA7FF97FF8);

    emu.run(None).unwrap();

    let result = emu.maps.read_qword(0x2010).unwrap();
    assert_eq!(result, 0x7FFF7FFE7FFD7FFC, "PMAXSW: all positive");
}

#[test]
fn test_pmaxsw_all_negative() {
    let mut emu = emu64();
    let code = vec![
        0x0f, 0x6f, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0x0f, 0x6f, 0x0c, 0x25, 0x08, 0x20, 0x00, 0x00,
        0x0f, 0xee, 0xc1,
        0x0f, 0x7f, 0x04, 0x25, 0x10, 0x20, 0x00, 0x00,
        0xf4,
    ];

    emu.load_code_bytes(&code);

    emu.maps.write_qword(0x2000, 0xFFF0FFE0FFD0FFC0);
    emu.maps.write_qword(0x2008, 0xFFE8FFD8FFC8FFB8);

    emu.run(None).unwrap();

    let result = emu.maps.read_qword(0x2010).unwrap();
    assert_eq!(result, 0xFFF0FFE0FFD0FFC0, "PMAXSW: all negative");
}

#[test]
fn test_pmaxsw_mixed_signs() {
    let mut emu = emu64();
    let code = vec![
        0x0f, 0x6f, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0x0f, 0x6f, 0x0c, 0x25, 0x08, 0x20, 0x00, 0x00,
        0x0f, 0xee, 0xc1,
        0x0f, 0x7f, 0x04, 0x25, 0x10, 0x20, 0x00, 0x00,
        0xf4,
    ];

    emu.load_code_bytes(&code);

    emu.maps.write_qword(0x2000, 0x7FFF8000FFF00010);
    emu.maps.write_qword(0x2008, 0x0001FFFF00100020);

    emu.run(None).unwrap();

    let result = emu.maps.read_qword(0x2010).unwrap();
    assert_eq!(result, 0x7FFFFFFF00100020, "PMAXSW: mixed signs");
}

#[test]
fn test_pmaxsw_identical() {
    let mut emu = emu64();
    let code = vec![
        0x0f, 0x6f, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0x0f, 0x6f, 0x0c, 0x25, 0x08, 0x20, 0x00, 0x00,
        0x0f, 0xee, 0xc1,
        0x0f, 0x7f, 0x04, 0x25, 0x10, 0x20, 0x00, 0x00,
        0xf4,
    ];

    emu.load_code_bytes(&code);

    emu.maps.write_qword(0x2000, 0x1234567890ABCDEF);
    emu.maps.write_qword(0x2008, 0x1234567890ABCDEF);

    emu.run(None).unwrap();

    let result = emu.maps.read_qword(0x2010).unwrap();
    assert_eq!(result, 0x1234567890ABCDEF, "PMAXSW: identical values");
}

#[test]
fn test_pmaxsw_max_value() {
    let mut emu = emu64();
    let code = vec![
        0x0f, 0x6f, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0x0f, 0x6f, 0x0c, 0x25, 0x08, 0x20, 0x00, 0x00,
        0x0f, 0xee, 0xc1,
        0x0f, 0x7f, 0x04, 0x25, 0x10, 0x20, 0x00, 0x00,
        0xf4,
    ];

    emu.load_code_bytes(&code);

    emu.maps.write_qword(0x2000, 0x7FFF7FFF7FFF7FFF);
    emu.maps.write_qword(0x2008, 0x0000000000000000);

    emu.run(None).unwrap();

    let result = emu.maps.read_qword(0x2010).unwrap();
    assert_eq!(result, 0x7FFF7FFF7FFF7FFF, "PMAXSW: max value vs zero");
}

#[test]
fn test_pmaxsw_min_value() {
    let mut emu = emu64();
    let code = vec![
        0x0f, 0x6f, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0x0f, 0x6f, 0x0c, 0x25, 0x08, 0x20, 0x00, 0x00,
        0x0f, 0xee, 0xc1,
        0x0f, 0x7f, 0x04, 0x25, 0x10, 0x20, 0x00, 0x00,
        0xf4,
    ];

    emu.load_code_bytes(&code);

    emu.maps.write_qword(0x2000, 0x8000800080008000);
    emu.maps.write_qword(0x2008, 0x0000000000000000);

    emu.run(None).unwrap();

    let result = emu.maps.read_qword(0x2010).unwrap();
    assert_eq!(result, 0x0000000000000000, "PMAXSW: min value vs zero");
}

#[test]
fn test_pmaxsw_memory_operand() {
    let mut emu = emu64();
    let code = vec![
        0x0f, 0x6f, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0x0f, 0xee, 0x04, 0x25, 0x08, 0x20, 0x00, 0x00,
        0x0f, 0x7f, 0x04, 0x25, 0x10, 0x20, 0x00, 0x00,
        0xf4,
    ];

    emu.load_code_bytes(&code);

    emu.maps.write_qword(0x2000, 0x1000200030004000);
    emu.maps.write_qword(0x2008, 0x0800180028003800);

    emu.run(None).unwrap();

    let result = emu.maps.read_qword(0x2010).unwrap();
    assert_eq!(result, 0x1000200030004000, "PMAXSW: memory operand");
}

#[test]
fn test_pmaxsw_alternating() {
    let mut emu = emu64();
    let code = vec![
        0x0f, 0x6f, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0x0f, 0x6f, 0x0c, 0x25, 0x08, 0x20, 0x00, 0x00,
        0x0f, 0xee, 0xc1,
        0x0f, 0x7f, 0x04, 0x25, 0x10, 0x20, 0x00, 0x00,
        0xf4,
    ];

    emu.load_code_bytes(&code);

    emu.maps.write_qword(0x2000, 0x7FFF80007FFF8000);
    emu.maps.write_qword(0x2008, 0x80007FFF80007FFF);

    emu.run(None).unwrap();

    let result = emu.maps.read_qword(0x2010).unwrap();
    assert_eq!(result, 0x7FFF7FFF7FFF7FFF, "PMAXSW: alternating pattern");
}

#[test]
fn test_pmaxsw_sequential() {
    let mut emu = emu64();
    let code = vec![
        0x0f, 0x6f, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0x0f, 0x6f, 0x0c, 0x25, 0x08, 0x20, 0x00, 0x00,
        0x0f, 0xee, 0xc1,
        0x0f, 0x6f, 0x14, 0x25, 0x10, 0x20, 0x00, 0x00,
        0x0f, 0xee, 0xc2,
        0x0f, 0x7f, 0x04, 0x25, 0x18, 0x20, 0x00, 0x00,
        0xf4,
    ];

    emu.load_code_bytes(&code);

    emu.maps.write_qword(0x2000, 0x1000200030004000);
    emu.maps.write_qword(0x2008, 0x0800300020005000);
    emu.maps.write_qword(0x2010, 0x0C00250035004500);

    emu.run(None).unwrap();

    let result = emu.maps.read_qword(0x2018).unwrap();
    assert_eq!(result, 0x1000300035005000, "PMAXSW: sequential maximum");
}

#[test]
fn test_pmaxsw_self() {
    let mut emu = emu64();
    let code = vec![
        0x0f, 0x6f, 0x04, 0x25, 0x00, 0x20, 0x00, 0x00,
        0x0f, 0xee, 0xc0,
        0x0f, 0x7f, 0x04, 0x25, 0x10, 0x20, 0x00, 0x00,
        0xf4,
    ];

    emu.load_code_bytes(&code);

    emu.maps.write_qword(0x2000, 0x123456789ABCDEF0);

    emu.run(None).unwrap();

    let result = emu.maps.read_qword(0x2010).unwrap();
    assert_eq!(result, 0x123456789ABCDEF0, "PMAXSW: self-maximum");
}