--- m3-lang.c.orig	Sat Feb  6 13:14:26 1999
+++ m3-lang.c	Sun Mar 14 11:13:56 1999
@@ -546,6 +546,20 @@
 };
 #endif
 
+#if defined(__FreeBSD__) && defined(__i386__)
+#define HAVE_REGISTER_MAP
+#define DK	6	/* "Don't know" */
+static int regno_to_jmpbuf[24] = {
+    DK,  DK,  DK,   1,	/* eax, ecx,    edx, ebx */
+     2,   3,   4,   5,	/* esp, ebp,    esi, edi */
+     0,  DK,  DK,  DK,	/* eip, eflags, cs,  ss */
+    DK,  DK,  DK,  DK,	/* ds,  es,     fs,  gs */
+    DK,  DK,  DK,  DK,	/* st0, st1,    st2, st3 */
+    DK,  DK,  DK,  DK	/* st4, st5,    st6, st7 */
+};
+#undef DK
+#endif
+
 /*---------------------------------------------------- thread enumeration ---*/
 
 typedef struct {