Fix LC_DYLD_EXPORTS_TRIE offset fixup

Fixes #29

lib.rs

@@ -360,7 +360,7 @@ const LC_DYLD_INFO: u32 = 0x22;
 const LC_DYLD_INFO_ONLY: u32 = 0x80000022;
 const LC_DYLIB_CODE_SIGN_DRS: u32 = 0x2b;
 const LC_LINKER_OPTIMIZATION_HINT: u32 = 0x2d;
-const LC_DYLD_EXPORTS_TRIE: u32 = 0x8000001e;
+const LC_DYLD_EXPORTS_TRIE: u32 = 0x80000033;
 const LC_DYLD_CHAINED_FIXUPS: u32 = 0x80000034;
 
 const CPU_TYPE_ARM_64: i32 = 0x0100000c;

tests/rtld_default.rs

@@ -0,0 +1,21 @@
+extern "C" {
+    fn dlsym(handle: isize, symbol: *const u8) -> usize;
+    fn dlerror() -> *const u8;
+}
+
+#[no_mangle]
+pub extern "C" fn exported_sym() {
+    println!("Hello from exported_sym");
+}
+
+const RTLD_DEFAULT: isize = -2;
+
+fn main() {
+    if unsafe { dlsym(RTLD_DEFAULT, "exported_sym\0".as_ptr()) } == 0 {
+        let err = unsafe { dlerror() };
+        let err = unsafe { std::ffi::CStr::from_ptr(err as _) };
+        let err = err.to_str().unwrap();
+        eprintln!("Error: {}", err);
+        panic!("Symbol not found");
+    }
+}

tests/test_rtld_default.sh

@@ -0,0 +1,4 @@
+rustc --target x86_64-apple-darwin -Clink-arg="-Wl,-exported_symbol,_exported_sym" tests/rtld_default.rs
+cargo r -- ./tests/rtld_default tests/test.txt ./tests/out
+chmod +x ./tests/out
+./tests/out