* can share a fair amount of code between different variants. */
#if defined __FreeBSD__
#define CONTEXT_ADDR_FROM_STEM(stem) &context->uc_mcontext.mc_ ## stem
-#elif defined __OpenBSD__
+#elif defined(__OpenBSD__)
#define CONTEXT_ADDR_FROM_STEM(stem) &context->sc_ ## stem
+#elif defined __NetBSD__
+#define CONTEXT_ADDR_FROM_STEM(stem) &((context)->uc_mcontext.__gregs[_REG_ ## stem])
#else
#error unsupported BSD variant
#endif
+#if defined(LISP_FEATURE_SB_THREAD)
+
+#if defined LISP_FEATURE_FREEBSD
+/* FIXME: why is this only done for SB-THREAD? */
+#define RESTORE_FP_CONTROL_FROM_CONTEXT
+void os_restore_fp_control(os_context_t *context);
+#endif
+
+#endif
+
#endif /* _X86_BSD_OS_H */