diff --git a/mach-test/build.rs b/mach-test/build.rs
index 661e3fa..7ba095b 100644
--- a/mach-test/build.rs
+++ b/mach-test/build.rs
@@ -128,6 +128,8 @@ fn main() {
         .header("mach/vm_task.h")
         .header("mach/vm_types.h");
 
+    cfg.header("mach-o/loader.h").header("mach-o/dyld.h");
+
     // The below doesn't exist in Xcode 14:
     if xcode < Xcode(14, 0) {
         cfg.header("mach/lock_set.h");
diff --git a/src/dyld.rs b/src/dyld.rs
new file mode 100644
index 0000000..8202d37
--- /dev/null
+++ b/src/dyld.rs
@@ -0,0 +1,16 @@
+//! This module roughly corresponds to `mach-o/dyld.h`.
+
+use loader::mach_header;
+
+extern "C" {
+    pub fn _dyld_image_count() -> u32;
+    pub fn _dyld_get_image_header(image_index: u32) -> *const mach_header;
+    pub fn _dyld_get_image_vmaddr_slide(image_index: u32) -> ::libc::intptr_t;
+    pub fn _dyld_get_image_name(image_index: u32) -> *const ::libc::c_char;
+    pub fn _dyld_register_func_for_add_image(
+        callback: unsafe extern "C" fn(mh: *const mach_header, vmaddr_slide: ::libc::intptr_t),
+    );
+    pub fn _dyld_register_func_for_remove_image(
+        callback: unsafe extern "C" fn(mh: *const mach_header, vmaddr_slide: ::libc::intptr_t),
+    );
+}
diff --git a/src/lib.rs b/src/lib.rs
index 4306ee3..e0c87a0 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -24,11 +24,13 @@ pub mod clock;
 pub mod clock_priv;
 pub mod clock_reply;
 pub mod clock_types; // TODO: test
+pub mod dyld;
 pub mod dyld_kernel;
 // pub mod error; // TODO
 pub mod exc;
 pub mod exception_types;
 pub mod kern_return;
+pub mod loader;
 pub mod mach_init;
 pub mod mach_port;
 pub mod mach_time;
diff --git a/src/loader.rs b/src/loader.rs
new file mode 100644
index 0000000..1b0d3a9
--- /dev/null
+++ b/src/loader.rs
@@ -0,0 +1,14 @@
+//! This module roughly corresponds to `mach-o/loader.h`.
+
+#[repr(C)]
+#[allow(dead_code, non_snake_case)]
+#[derive(Copy, Clone, Debug)]
+pub struct mach_header {
+    pub magic: u32,
+    pub cputype: ::libc::cpu_type_t,
+    pub cpusubtype: ::libc::cpu_subtype_t,
+    pub filetype: u32,
+    pub ncmds: u32,
+    pub sizeofcmds: u32,
+    pub flags: u32,
+}