1 files changed, 86 insertions, 0 deletions
diff --git a/src/crt.rs b/src/crt.rs
new file mode 100644
index 0000000..ad316e2
--- /dev/null
+++ b/src/crt.rs
@@ -0,0 +1,86 @@
+//! C runtime library.
+//!
+//! Functions imported from `ntoskrnl.exe`.
+
+extern "C"
+{
+	pub fn memcmp(s1: *const u8, s2: *const u8, n: usize) -> i32;
+	pub fn memcpy(dest: *mut u8, src: *const u8, n: usize) -> *mut u8;
+
+	pub fn strlen(s: *const u8) -> usize;
+	pub fn strcmp(s1: *const u8, s2: *const u8) -> i32;
+	pub fn strcpy(dest: *mut u8, src: *const u8) -> *mut u8;
+	pub fn strcat(dest: *mut u8, src: *const u8) -> *mut u8;
+	pub fn strncpy(dest: *mut u8, src: *const u8, n: usize) -> *mut u8;
+
+	pub fn wcslen(s: *const u16) -> usize;
+	pub fn wcscpy(dest: *mut u16, src: *const u16) -> *mut u16;
+	pub fn wcsncpy(dest: *mut u16, src: *const u16, n: usize) -> *mut u16;
+}
+
+
+#[no_mangle]
+#[allow(non_upper_case_globals)]
+#[cfg(target_arch="x86")]
+#[doc(hidden)]
+pub static __security_cookie: usize = 0xBB40E64E;
+
+#[no_mangle]
+#[allow(non_upper_case_globals)]
+#[cfg(target_arch="x86_64")]
+#[doc(hidden)]
+pub static __security_cookie: usize = 0x00002B992DDFA232;
+
+
+#[doc(hidden)]
+pub mod rust_intrinsics
+{
+	// Idk why, but linker cannot find `_memcmp` for llvm intrinsics. So lets make forward one.
+	#[no_mangle]
+	pub unsafe extern fn memcmp(s1: *const u8, s2: *const u8, n: usize) -> i32 {
+		return ::crt::memcmp(s1, s2, n);
+	}
+
+	// ported from compiler-rt
+	#[no_mangle]
+	pub unsafe extern fn __mulodi4(a: i64, b: i64, overflow: &mut i32) -> i64 {
+		const N: i32 = 64;
+		const MIN: i64 = 1 << (N-1);
+		const MAX: i64 = !MIN;
+		*overflow = 0;
+
+		let result = a * b;
+		if a == MIN {
+			if b != 0 && b != 1 {
+				*overflow = 1;
+			}
+			return result;
+		}
+
+		if b == MIN {
+			if a != 0 && a != 1 {
+				*overflow = 1;
+			}
+			return result;
+		}
+
+		let sa = a >> (N-1);
+		let sb = b >> (N-1);
+		let abs_a = (a ^ sa) - sa;
+		let abs_b = (b ^ sb) - sb;
+
+		if abs_a < 2 || abs_b < 2 {
+			return result;
+		}
+		if sa == sb {
+			if abs_a > MAX / abs_b {
+				*overflow = 1;
+			}
+		} else {
+			if abs_a > MIN / -abs_b {
+				*overflow = 1;
+			}
+		}
+		return result;
+	}
+}