sim: bfin: allow pushing of SP

The hardware respects this insn, and some code (like the on-chip bootrom)
uses it, so allow it.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

sim/bfin/ChangeLog

@@ -1,3 +1,8 @@
+2011-05-14  Mike Frysinger  <vapier@gentoo.org>
+
+	* bfin-sim.c (decode_PushPopReg_0): Delete (grp == 1 && reg == 6)
+	check for SP reg.
+
 2011-05-14  Mike Frysinger  <vapier@gentoo.org>
 
 	* dv-bfin_uart.c (bfin_uart_write_byte): Add a mcr arg.  Declare a

sim/bfin/bfin-sim.c

@@ -2035,8 +2035,7 @@ decode_PushPopReg_0 (SIM_CPU *cpu, bu16 iw0)
   else
     {
       TRACE_INSN (cpu, "[--SP] = %s;", reg_name);
-      /* Can't push SP.  */
-      if (INSN_LEN == 8 || (grp == 1 && reg == 6))
+      if (INSN_LEN == 8)
 	illegal_instruction_combination (cpu);
 
       sp -= 4;