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use std::fmt::Write;
use yaxpeax_arch::{Decoder, LengthedInstruction};
use yaxpeax_arch::display::DisplaySink;
use yaxpeax_x86::real_mode::InstDecoder;
use yaxpeax_x86::real_mode::{DisplayRules, DisplayStyle};
use yaxpeax_x86::real_mode::AbsoluteAddressFormatter;
use std::fmt;
fn test_display_rule<Rules: for<'f, 'g> DisplayRules<yaxpeax_arch::display::FmtSink<'f, fmt::Formatter<'g>>>>(
decoder: &InstDecoder, testcase: &'static TestCase, rules: [&Rules; 3]
) {
let mut reader = yaxpeax_arch::U8Reader::new(testcase.bytes);
let instr = decoder.decode(&mut reader).expect("display rule tests only run on instructions that decode");
assert_eq!(instr.len().to_const(), testcase.bytes.len() as u32, "instruction length is incorrect");
let intel_match = {
let actual = instr.display_rules(rules[0]).to_string();
if testcase.intel == actual {
Ok(())
} else {
Err(actual)
}
};
let c_match = {
let actual = instr.display_rules(rules[1]).to_string();
if let Some(c) = testcase.c.as_ref() {
if *c == actual.as_str() {
Ok(())
} else {
Err(actual)
}
} else {
Ok(())
}
};
let masm_match = {
let actual = instr.display_rules(rules[2]).to_string();
if let Some(masm) = testcase.masm.as_ref() {
if *masm == actual.as_str() {
Ok(())
} else {
Err(actual)
}
} else {
Ok(())
}
};
if intel_match.is_err() || c_match.is_err() || masm_match.is_err() {
let mut hex = String::new();
for b in testcase.bytes {
write!(hex, "{:02x}", b).unwrap();
}
eprintln!("rule-based formatting test failed for a covered style. \n \
instr: {}\n \
hex: {}", instr, hex);
if let Err(actual) = intel_match {
eprintln!(" [-] intel style: {}, wanted {}", actual, testcase.intel);
} else {
eprintln!(" [+] intel style: OK ({})", testcase.intel);
}
if let Err(actual) = c_match {
eprintln!(" [-] c style : {}, wanted {}", actual, testcase.c.unwrap());
} else {
eprintln!(" [+] c style : OK ({})", testcase.c.unwrap());
}
if let Err(actual) = masm_match {
eprintln!(" [-] masm style : {}, wanted {}", actual, testcase.masm.unwrap());
} else {
eprintln!(" [+] masm style : OK ({})", testcase.masm.unwrap());
}
panic!("rule-based formatting failed for {}", instr);
}
}
struct TestCase {
bytes: &'static [u8],
intel: &'static str,
c: Option<&'static str>,
masm: Option<&'static str>,
}
impl TestCase {
const fn new(bytes: &'static [u8], intel: &'static str, c: Option<&'static str>, masm: Option<&'static str>) -> Self {
Self { bytes, intel, c, masm }
}
}
#[test]
fn test_absolute_addr() {
let rules = AbsoluteAddressFormatter::new(0x3800);
let rules_c = rules.with_style(DisplayStyle::C);
let rules_masm = rules.with_style(DisplayStyle::Masm);
let decoder = InstDecoder::default();
static CASES: &'static [TestCase] = &[
TestCase::new(
&[0x33, 0xc0],
"xor ax, ax", Some("ax ^= ax"), Some("xor ax, ax")
),
TestCase::new(
&[0x33, 0x45, 0x78],
"xor ax, word [di + 0x78]", Some("ax ^= [di + 0x78]"), Some("xor ax, word ptr [di + 78h]"),
),
TestCase::new(
&[0xeb, 0x10],
"jmp 0x3812", Some("jmp 0x3812"), Some("jmp 3812h"),
),
TestCase::new(
&[0xe9, 0x00, 0xd0],
"jmp 0x803", Some("jmp 0x803"), Some("jmp 803h"),
),
];
for case in CASES.iter() {
test_display_rule(&decoder, case, [&rules, &rules_c, &rules_masm]);
}
}
/// a simple DisplayRules impl to test that addresses directly at symbols are printed reasonably.
/// if a symbol is not directly at an address, the address is printed instead.
#[derive(Copy, Clone)]
struct SimpleSymbolicator<'syms> {
eip: u32,
style: DisplayStyle,
symbols: &'syms [(u32, &'static str)],
}
impl<'syms> SimpleSymbolicator<'syms> {
pub fn new(eip: u32, symbols: &'syms [(u32, &'static str)]) -> Self {
SimpleSymbolicator {
eip,
style: DisplayStyle::Intel,
symbols,
}
}
pub fn with_style(mut self, style: DisplayStyle) -> Self {
self.style = style;
self
}
}
impl<'syms, S: DisplaySink> DisplayRules<S> for SimpleSymbolicator<'syms> {
fn display_style(&self) -> DisplayStyle {
self.style
}
fn instr_addr(&self) -> Option<u32> {
Some(self.eip)
}
fn emit_address(&self, addr: u32, s: &mut S) -> Result<bool, fmt::Error> {
for (sym_addr, sym) in self.symbols {
if *sym_addr == addr {
s.write_str(sym)?;
return Ok(true);
}
}
Ok(false)
}
}
#[test]
fn test_symbolication() {
let syms = &[
(0x0000_9000, "memcpy"),
(0x0000_c000, "global"),
(0x0000_8002, "branch_target"),
(0x0000_8003, "wide_target"),
];
let rules = SimpleSymbolicator::new(0x0000_8000, syms);
let rules_c = rules.with_style(DisplayStyle::C);
let rules_masm = rules.with_style(DisplayStyle::Masm);
let decoder = InstDecoder::default();
static CASES: &'static [TestCase] = &[
TestCase::new(
&[0xe8, 0xfd, 0x0f],
"call memcpy", Some("call memcpy"), Some("call memcpy")
),
TestCase::new(
&[0x33, 0x45, 0x78],
"xor ax, word [di + 0x78]", Some("ax ^= [di + 0x78]"), Some("xor ax, word ptr [di + 78h]"),
),
TestCase::new(
&[0xa2, 0x00, 0xc0],
"mov byte [global], al", Some("[global] = al"), Some("mov byte ptr [global], al"),
),
TestCase::new(
&[0xeb, 0x00],
"jmp branch_target", Some("jmp branch_target"), Some("jmp branch_target"),
),
TestCase::new(
&[0xe9, 0x00, 0x00],
"jmp wide_target", Some("jmp wide_target"), Some("jmp wide_target"),
),
];
for case in CASES.iter() {
test_display_rule(&decoder, case, [&rules, &rules_c, &rules_masm]);
}
}
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