sim: bfin: keep track of the exact position of parallel insns

Some insns need to know which slot they're in to determine whether they
are valid.  So add an enum for each slot, and check that rather than the
overall insn len.  This makes tracking things in the code much clearer.
However, this code is functionally the same, so a follow up patch will
leverage this more to properly flag invalid parallel insn combos.

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

3 files changed, 75 insertions, 44 deletions

diff --git a/sim/bfin/ChangeLog b/sim/bfin/ChangeLog
index e11b974..f7fe209 100644
--- a/sim/bfin/ChangeLog
+++ b/sim/bfin/ChangeLog
@@ -1,5 +1,19 @@
 2012-04-08  Mike Frysinger  <vapier@gentoo.org>
 
+	* bfin-sim.h (bfin_parallel_group): New enum.
+	(bfin_cpu_state): Add new "group" member.
+	(PARALLEL_GROUP): Define.
+	* bfin-sim.c (decode_ProgCtrl_0): Change INSN_LEN check to
+	PARALLEL_GROUP.
+	(decode_CaCTRL_0, decode_PushPopReg_0, decode_ccMV_0, decode_CCflag_0,
+	decode_CC2dreg_0, decode_CC2stat_0, decode_BRCC_0, decode_UJUMP_0,
+	decode_LOGI2op_0, decode_LoopSetup_0, decode_LDIMMhalf_0,
+	decode_CALLa_0, decode_linkage_0): Likewise.
+	(_interp_insn_bfin): Set PARALLEL_GROUP.
+	(interp_insn_bfin): Likewise.
+
+2012-04-08  Mike Frysinger  <vapier@gentoo.org>
+
 	* bfin-sim.c (decode_dsp32alu_0): Delete extra space in TRACE_INSN.
 
 2012-04-01  Mike Frysinger  <vapier@gentoo.org>
diff --git a/sim/bfin/bfin-sim.c b/sim/bfin/bfin-sim.c
index 8e76291..25cc6d1 100644
--- a/sim/bfin/bfin-sim.c
+++ b/sim/bfin/bfin-sim.c
@@ -1762,7 +1762,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
       PROFILE_COUNT_INSN (cpu, pc, BFIN_INSN_ProgCtrl_branch);
       TRACE_INSN (cpu, "RTS;");
       IFETCH_CHECK (newpc);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       TRACE_BRANCH (cpu, pc, newpc, -1, "RTS");
       SET_PCREG (newpc);
@@ -1774,7 +1774,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
       PROFILE_COUNT_INSN (cpu, pc, BFIN_INSN_ProgCtrl_branch);
       TRACE_INSN (cpu, "RTI;");
       /* Do not do IFETCH_CHECK here -- LSB has special meaning.  */
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       cec_return (cpu, -1);
       CYCLE_DELAY = 5;
@@ -1786,7 +1786,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
       TRACE_INSN (cpu, "RTX;");
       /* XXX: Not sure if this is what the hardware does.  */
       IFETCH_CHECK (newpc);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       cec_return (cpu, IVG_EVX);
       CYCLE_DELAY = 5;
@@ -1798,7 +1798,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
       TRACE_INSN (cpu, "RTN;");
       /* XXX: Not sure if this is what the hardware does.  */
       IFETCH_CHECK (newpc);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       cec_return (cpu, IVG_NMI);
       CYCLE_DELAY = 5;
@@ -1807,7 +1807,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
     {
       PROFILE_COUNT_INSN (cpu, pc, BFIN_INSN_ProgCtrl_branch);
       TRACE_INSN (cpu, "RTE;");
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       cec_return (cpu, IVG_EMU);
       CYCLE_DELAY = 5;
@@ -1822,7 +1822,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
          in user mode, it's a NOP ...  */
       TRACE_INSN (cpu, "IDLE;");
 
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
 
       /* Timewarp !  */
@@ -1836,7 +1836,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
       PROFILE_COUNT_INSN (cpu, pc, BFIN_INSN_ProgCtrl_sync);
       /* Just NOP it.  */
       TRACE_INSN (cpu, "CSYNC;");
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       CYCLE_DELAY = 10;
     }
@@ -1845,7 +1845,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
       PROFILE_COUNT_INSN (cpu, pc, BFIN_INSN_ProgCtrl_sync);
       /* Just NOP it.  */
       TRACE_INSN (cpu, "SSYNC;");
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
 
       /* Really 10+, but no model info for this.  */
@@ -1855,7 +1855,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
     {
       PROFILE_COUNT_INSN (cpu, pc, BFIN_INSN_ProgCtrl_cec);
       TRACE_INSN (cpu, "EMUEXCPT;");
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       cec_exception (cpu, VEC_SIM_TRAP);
     }
@@ -1863,7 +1863,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
     {
       PROFILE_COUNT_INSN (cpu, pc, BFIN_INSN_ProgCtrl_cec);
       TRACE_INSN (cpu, "CLI R%i;", poprnd);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       SET_DREG (poprnd, cec_cli (cpu));
     }
@@ -1871,7 +1871,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
     {
       PROFILE_COUNT_INSN (cpu, pc, BFIN_INSN_ProgCtrl_cec);
       TRACE_INSN (cpu, "STI R%i;", poprnd);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       cec_sti (cpu, DREG (poprnd));
       CYCLE_DELAY = 3;
@@ -1882,7 +1882,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
       PROFILE_COUNT_INSN (cpu, pc, BFIN_INSN_ProgCtrl_branch);
       TRACE_INSN (cpu, "JUMP (%s);", get_preg_name (poprnd));
       IFETCH_CHECK (newpc);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       TRACE_BRANCH (cpu, pc, newpc, -1, "JUMP (Preg)");
       SET_PCREG (newpc);
@@ -1896,7 +1896,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
       PROFILE_COUNT_INSN (cpu, pc, BFIN_INSN_ProgCtrl_branch);
       TRACE_INSN (cpu, "CALL (%s);", get_preg_name (poprnd));
       IFETCH_CHECK (newpc);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       TRACE_BRANCH (cpu, pc, newpc, -1, "CALL (Preg)");
       /* If we're at the end of a hardware loop, RETS is going to be
@@ -1913,7 +1913,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
       PROFILE_COUNT_INSN (cpu, pc, BFIN_INSN_ProgCtrl_branch);
       TRACE_INSN (cpu, "CALL (PC + %s);", get_preg_name (poprnd));
       IFETCH_CHECK (newpc);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       TRACE_BRANCH (cpu, pc, newpc, -1, "CALL (PC + Preg)");
       SET_RETSREG (hwloop_get_next_pc (cpu, pc, 2));
@@ -1928,7 +1928,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
       PROFILE_COUNT_INSN (cpu, pc, BFIN_INSN_ProgCtrl_branch);
       TRACE_INSN (cpu, "JUMP (PC + %s);", get_preg_name (poprnd));
       IFETCH_CHECK (newpc);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       TRACE_BRANCH (cpu, pc, newpc, -1, "JUMP (PC + Preg)");
       SET_PCREG (newpc);
@@ -1941,7 +1941,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
       int raise = uimm4 (poprnd);
       PROFILE_COUNT_INSN (cpu, pc, BFIN_INSN_ProgCtrl_cec);
       TRACE_INSN (cpu, "RAISE %s;", uimm4_str (raise));
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       cec_require_supervisor (cpu);
       if (raise == IVG_IVHW)
@@ -1955,7 +1955,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
       int excpt = uimm4 (poprnd);
       PROFILE_COUNT_INSN (cpu, pc, BFIN_INSN_ProgCtrl_cec);
       TRACE_INSN (cpu, "EXCPT %s;", uimm4_str (excpt));
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       cec_exception (cpu, excpt);
       CYCLE_DELAY = 3;
@@ -1966,7 +1966,7 @@ decode_ProgCtrl_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
       bu8 byte;
       PROFILE_COUNT_INSN (cpu, pc, BFIN_INSN_ProgCtrl_atomic);
       TRACE_INSN (cpu, "TESTSET (%s);", get_preg_name (poprnd));
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       byte = GET_WORD (addr);
       SET_CCREG (byte == 0);
@@ -1995,7 +1995,7 @@ decode_CaCTRL_0 (SIM_CPU *cpu, bu16 iw0)
   TRACE_EXTRACT (cpu, "%s: a:%i op:%i reg:%i", __func__, a, op, reg);
   TRACE_INSN (cpu, "%s [%s%s];", sinsn[op], get_preg_name (reg), a ? "++" : "");
 
-  if (INSN_LEN == 8)
+  if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
     /* None of these can be part of a parallel instruction.  */
     illegal_instruction_combination (cpu);
 
@@ -2054,7 +2054,8 @@ decode_PushPopReg_0 (SIM_CPU *cpu, bu16 iw0)
 	illegal_instruction (cpu);
       TRACE_INSN (cpu, "%s = [SP++];", reg_name);
       /* Can't pop USP while in userspace.  */
-      if (INSN_LEN == 8 || (grp == 7 && reg == 0 && cec_is_user_mode(cpu)))
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE
+	  || (grp == 7 && reg == 0 && cec_is_user_mode(cpu)))
 	illegal_instruction_combination (cpu);
       /* XXX: The valid register check is in reg_write(), so we might
               incorrectly do a GET_LONG() here ...  */
@@ -2068,7 +2069,7 @@ decode_PushPopReg_0 (SIM_CPU *cpu, bu16 iw0)
   else
     {
       TRACE_INSN (cpu, "[--SP] = %s;", reg_name);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
 
       sp -= 4;
@@ -2183,7 +2184,7 @@ decode_ccMV_0 (SIM_CPU *cpu, bu16 iw0)
   TRACE_INSN (cpu, "IF %sCC %s = %s;", T ? "" : "! ",
 	      get_allreg_name (d, dst),
 	      get_allreg_name (s, src));
-  if (INSN_LEN == 8)
+  if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
     illegal_instruction_combination (cpu);
 
   if (cond)
@@ -2219,21 +2220,21 @@ decode_CCflag_0 (SIM_CPU *cpu, bu16 iw0)
       if (opc == 5 && I == 0 && G == 0)
 	{
 	  TRACE_INSN (cpu, "CC = A0 == A1;");
-	  if (INSN_LEN == 8)
+	  if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	    illegal_instruction_combination (cpu);
 	  SET_CCREG (acc0 == acc1);
 	}
       else if (opc == 6 && I == 0 && G == 0)
 	{
 	  TRACE_INSN (cpu, "CC = A0 < A1");
-	  if (INSN_LEN == 8)
+	  if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	    illegal_instruction_combination (cpu);
 	  SET_CCREG (acc0 < acc1);
 	}
       else if (opc == 7 && I == 0 && G == 0)
 	{
 	  TRACE_INSN (cpu, "CC = A0 <= A1");
-	  if (INSN_LEN == 8)
+	  if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	    illegal_instruction_combination (cpu);
 	  SET_CCREG (acc0 <= acc1);
 	}
@@ -2330,21 +2331,21 @@ decode_CC2dreg_0 (SIM_CPU *cpu, bu16 iw0)
   if (op == 0)
     {
       TRACE_INSN (cpu, "R%i = CC;", reg);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       SET_DREG (reg, CCREG);
     }
   else if (op == 1)
     {
       TRACE_INSN (cpu, "CC = R%i;", reg);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       SET_CCREG (DREG (reg) != 0);
     }
   else if (op == 3 && reg == 0)
     {
       TRACE_INSN (cpu, "CC = !CC;");
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       SET_CCREG (!CCREG);
     }
@@ -2376,7 +2377,7 @@ decode_CC2stat_0 (SIM_CPU *cpu, bu16 iw0)
   if (cbit == 5)
     illegal_instruction (cpu);
 
-  if (INSN_LEN == 8)
+  if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
     illegal_instruction_combination (cpu);
 
   pval = !!(ASTAT & (1 << cbit));
@@ -2422,7 +2423,7 @@ decode_BRCC_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
   TRACE_INSN (cpu, "IF %sCC JUMP %#x%s;", T ? "" : "! ",
 	      pcrel, B ? " (bp)" : "");
 
-  if (INSN_LEN == 8)
+  if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
     illegal_instruction_combination (cpu);
 
   if (cond)
@@ -2458,7 +2459,7 @@ decode_UJUMP_0 (SIM_CPU *cpu, bu16 iw0, bu32 pc)
 
   TRACE_INSN (cpu, "JUMP.S %#x;", pcrel);
 
-  if (INSN_LEN == 8)
+  if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
     illegal_instruction_combination (cpu);
 
   TRACE_BRANCH (cpu, pc, newpc, -1, "JUMP.S");
@@ -2705,21 +2706,21 @@ decode_LOGI2op_0 (SIM_CPU *cpu, bu16 iw0)
   if (opc == 0)
     {
       TRACE_INSN (cpu, "CC = ! BITTST (R%i, %s);", dst, uimm_str);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       SET_CCREG ((~DREG (dst) >> uimm) & 1);
     }
   else if (opc == 1)
     {
       TRACE_INSN (cpu, "CC = BITTST (R%i, %s);", dst, uimm_str);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       SET_CCREG ((DREG (dst) >> uimm) & 1);
     }
   else if (opc == 2)
     {
       TRACE_INSN (cpu, "BITSET (R%i, %s);", dst, uimm_str);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       SET_DREG (dst, DREG (dst) | (1 << uimm));
       setflags_logical (cpu, DREG (dst));
@@ -2727,7 +2728,7 @@ decode_LOGI2op_0 (SIM_CPU *cpu, bu16 iw0)
   else if (opc == 3)
     {
       TRACE_INSN (cpu, "BITTGL (R%i, %s);", dst, uimm_str);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       SET_DREG (dst, DREG (dst) ^ (1 << uimm));
       setflags_logical (cpu, DREG (dst));
@@ -2735,7 +2736,7 @@ decode_LOGI2op_0 (SIM_CPU *cpu, bu16 iw0)
   else if (opc == 4)
     {
       TRACE_INSN (cpu, "BITCLR (R%i, %s);", dst, uimm_str);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       SET_DREG (dst, DREG (dst) & ~(1 << uimm));
       setflags_logical (cpu, DREG (dst));
@@ -2743,21 +2744,21 @@ decode_LOGI2op_0 (SIM_CPU *cpu, bu16 iw0)
   else if (opc == 5)
     {
       TRACE_INSN (cpu, "R%i >>>= %s;", dst, uimm_str);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       SET_DREG (dst, ashiftrt (cpu, DREG (dst), uimm, 32));
     }
   else if (opc == 6)
     {
       TRACE_INSN (cpu, "R%i >>= %s;", dst, uimm_str);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       SET_DREG (dst, lshiftrt (cpu, DREG (dst), uimm, 32));
     }
   else if (opc == 7)
     {
       TRACE_INSN (cpu, "R%i <<= %s;", dst, uimm_str);
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       SET_DREG (dst, lshift (cpu, DREG (dst), uimm, 32, 0, 0));
     }
@@ -3465,7 +3466,7 @@ decode_LoopSetup_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1, bu32 pc)
   if (reg > 7)
     illegal_instruction (cpu);
 
-  if (INSN_LEN == 8)
+  if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
     illegal_instruction_combination (cpu);
 
   if (rop == 0)
@@ -3513,7 +3514,7 @@ decode_LDIMMhalf_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1)
   TRACE_EXTRACT (cpu, "%s: Z:%i H:%i S:%i grp:%i reg:%i hword:%#x",
 		 __func__, Z, H, S, grp, reg, hword);
 
-  if (INSN_LEN == 8)
+  if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
     illegal_instruction_combination (cpu);
 
   if (S == 1)
@@ -3565,7 +3566,7 @@ decode_CALLa_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1, bu32 pc)
 
   TRACE_INSN (cpu, "%s %#x;", S ? "CALL" : "JUMP.L", pcrel);
 
-  if (INSN_LEN == 8)
+  if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
     illegal_instruction_combination (cpu);
 
   if (S == 1)
@@ -3699,7 +3700,7 @@ decode_linkage_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1)
       int size = uimm16s4 (framesize);
       sp = SPREG;
       TRACE_INSN (cpu, "LINK %s;", uimm16s4_str (framesize));
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       sp -= 4;
       PUT_LONG (sp, RETSREG);
@@ -3714,7 +3715,7 @@ decode_linkage_0 (SIM_CPU *cpu, bu16 iw0, bu16 iw1)
       /* Restore SP from FP.  */
       sp = FPREG;
       TRACE_INSN (cpu, "UNLINK;");
-      if (INSN_LEN == 8)
+      if (PARALLEL_GROUP != BFIN_PARALLEL_NONE)
 	illegal_instruction_combination (cpu);
       SET_FPREG (GET_LONG (sp));
       sp += 4;
@@ -6177,6 +6178,7 @@ _interp_insn_bfin (SIM_CPU *cpu, bu32 pc)
       trace_prefix (sd, cpu, NULL_CIA, pc, TRACE_LINENUM_P (cpu),
 			NULL, 0, "|| %#"PRIx64, sim_events_time (sd));
       insn_len = 8;
+      PARALLEL_GROUP = BFIN_PARALLEL_GROUP0;
     }
   else
     insn_len = 4;
@@ -6238,6 +6240,7 @@ interp_insn_bfin (SIM_CPU *cpu, bu32 pc)
   bu32 insn_len;
 
   BFIN_CPU_STATE.n_stores = 0;
+  PARALLEL_GROUP = BFIN_PARALLEL_NONE;
   DIS_ALGN_EXPT &= ~1;
   CYCLE_DELAY = 1;
   INSN_LEN = 0;
@@ -6247,7 +6250,9 @@ interp_insn_bfin (SIM_CPU *cpu, bu32 pc)
   /* Proper display of multiple issue instructions.  */
   if (insn_len == 8)
     {
+      PARALLEL_GROUP = BFIN_PARALLEL_GROUP1;
       _interp_insn_bfin (cpu, pc + 4);
+      PARALLEL_GROUP = BFIN_PARALLEL_GROUP2;
       _interp_insn_bfin (cpu, pc + 6);
     }
   for (i = 0; i < BFIN_CPU_STATE.n_stores; i++)
diff --git a/sim/bfin/bfin-sim.h b/sim/bfin/bfin-sim.h
index 17bcdeb..9dadcd9 100644
--- a/sim/bfin/bfin-sim.h
+++ b/sim/bfin/bfin-sim.h
@@ -44,6 +44,13 @@ struct store {
   bu32 val;
 };
 
+enum bfin_parallel_group {
+  BFIN_PARALLEL_NONE,
+  BFIN_PARALLEL_GROUP0,	/* 32bit slot.  */
+  BFIN_PARALLEL_GROUP1,	/* 16bit group1.  */
+  BFIN_PARALLEL_GROUP2,	/* 16bit group2.  */
+};
+
 /* The KSP/USP handling wrt SP may not follow the hardware exactly (the hw
    looks at current mode and uses either SP or USP based on that.  We instead
    always operate on SP and mirror things in KSP and USP.  During a CEC
@@ -78,6 +85,10 @@ struct bfin_cpu_state
   /* The pc currently being interpreted in parallel insns.  */
   bu32 multi_pc;
 
+  /* Some insns are valid in group1, and others in group2, so we
+     need to keep track of the exact slot we're processing.  */
+  enum bfin_parallel_group group;
+
   /* Needed for supporting the DISALGNEXCPT instruction */
   int dis_algn_expt;
 
@@ -126,6 +137,7 @@ struct bfin_cpu_state
 #define EMUDAT_INREG	(BFIN_CPU_STATE.emudat[0])
 #define EMUDAT_OUTREG	(BFIN_CPU_STATE.emudat[1])
 #define INSN_LEN	(BFIN_CPU_STATE.insn_len)
+#define PARALLEL_GROUP	(BFIN_CPU_STATE.group)
 #define CYCLE_DELAY	(BFIN_CPU_STATE.cycle_delay)
 #define DIS_ALGN_EXPT	(BFIN_CPU_STATE.dis_algn_expt)