diff --git a/arch/m68k/freestanding/bits.h b/arch/m68k/freestanding/bits.h
new file mode 100644
index 0000000..17d3bf8
--- /dev/null
+++ b/arch/m68k/freestanding/bits.h
@@ -0,0 +1,28 @@
+#ifndef LIBUCONTEXT_BITS_H
+#define LIBUCONTEXT_BITS_H
+
+typedef struct sigaltstack {
+	void *ss_sp;
+	int ss_flags;
+	size_t ss_size;
+} libucontext_stack_t;
+
+typedef int libucontext_greg_t, libucontext_gregset_t[18];
+typedef struct {
+	int f_pcr, f_psr, f_fpiaddr, f_fpregs[8][3];
+} libucontext_fpregset_t;
+
+typedef struct {
+	int version;
+	libucontext_gregset_t gregs;
+	libucontext_fpregset_t fpregs;
+} libucontext_mcontext_t;
+
+typedef struct libucontext_ucontext {
+	unsigned long uc_flags;
+	struct libucontext_ucontext *uc_link;
+	libucontext_stack_t uc_stack;
+	libucontext_mcontext_t uc_mcontext;
+} libucontext_ucontext_t;
+
+#endif