Note two shortcomings of GDB on MIPS that should be addressed.

contrib/gdb/gdb/mipsfbsd-tdep.c

@@ -205,6 +205,8 @@ static struct core_fns mipsfbsd_elfcore_fns =
  * 0x7ffeffec    sigcode       -> 44 bytes
  *
  * 0x7ffeffc4    sigcode end   env strings etc start
+ *
+ * XXX This is out-of-date and varies by ABI.
  */
 #define MIPS_FBSD_SIGTRAMP_START           (0x7ffeffc4)
 #define MIPS_FBSD_SIGTRAMP_END             (0x7ffeffec)

gnu/usr.bin/gdb/arch/mips/Makefile

@@ -1,5 +1,8 @@
 # $FreeBSD$
 
+#
+# XXX Should set DEFAULT_BFD_VEC based on target.
+#
 .if !defined(GDB_CROSS_DEBUGGER)
 LIBSRCS+= mipsfbsd-nat.c fbsd-threads.c
 .endif