From c8c8175b623c597cf18442ff1e13456beb41931d Mon Sep 17 00:00:00 2001
From: Sandra Loosemore <sandra@codesourcery.com>
Date: Wed, 1 Jul 2015 16:08:03 -0700
Subject: [PATCH] Opcodes and assembler support for Nios II R2

2015-07-01  Sandra Loosemore  <sandra@codesourcery.com>
	    Cesar Philippidis  <cesar@codesourcery.com>

	gas/
	* config/tc-nios2.c (nios2_min_align): New.
	(nop): Replace with....
	(nop_r1, nop_r2, nop_r2_cdx, nop32, nop16): New.
	(nios2_align): Handle alignment on 2-byte boundaries when CDX
	instructions may be present.
	(s_nios2_align): Adjust reference to nop.
	(CDXBRANCH, IS_CDXBRANCH): New.
	(CDX_UBRANCH_SUBTYPE, CDX_CBRANCH_SUBTYPE): New.
	(nios2_relax_subtype_size): Handle 2-byte CDX branches.
	(nios2_relax_frag): Likewise.
	(md_convert_frag): Handle R2 encodings.
	(nios2_check_overflow): Check that low-order bits are zero
	before applying rightshift from howto.
	(nios2_check_overflow): Correct negative overflow calculation.
	(nios2_diagnose_overflow): Handle signed_immed12_overflow.  Issue
	generic overflow messages for miscellaneous instruction formats.
	(md_apply_fix): Recognize new R2 relocations.  For pc_relative
	relocations, store fixup in *valP.
	(nios2_reglist_mask, nios2_reglist_dir): New.
	(nios2_parse_reglist): New.
	(nios2_parse_base_register): New.
	(nios2_assemble_expression): Handle constant expressions designated
	by BFD_RELOC_NONE.
	(nios2_assemble_reg3): New.
	(nios2_assemble_arg_c): Handle R2 instruction formats.
	(nios2_assemble_arg_d): Likewise.
	(nios2_assemble_arg_s): Likewise.
	(nios2_assemble_arg_t): Likewise.
	(nios2_assemble_arg_D): New.
	(nios2_assemble_arg_S): New.
	(nios2_assemble_arg_T): New.
	(nios2_assemble_arg_i): Handle R2 instruction formats.
	(nios2_assemble_arg_I): New.
	(nios2_assemble_arg_u): Handle R2 instruction formats.
	(nios2_assemble_arg_U): New.
	(nios2_assemble_arg_V): New.
	(nios2_assemble_arg_W): New.
	(nios2_assemble_arg_X): New.
	(nios2_assemble_arg_Y): New.
	(nios2_assemble_arg_o): Handle R2 instruction formats.
	(nios2_assemble_arg_O): New.
	(nios2_assemble_arg_P): New.
	(nios2_assemble_arg_j): Handle R2 instruction formats.
	(nios2_assemble_arg_k): New.
	(nios2_assemble_arg_l): Handle R2 instruction formats.
	(nios2_assemble_arg_m): Likewise.
	(nios2_assemble_arg_M): New.
	(nios2_assemble_arg_N): New.
	(nios2_assemble_arg_e): New.
	(nios2_assemble_arg_f): New.
	(nios2_assemble_arg_g): New.
	(nios2_assemble_arg_h): New.
	(nios2_assemble_arg_R): New.
	(nios2_assemble_arg_B): New.
	(nios2_assemble_args): Handle new argument letters.
	(nios2_consume_arg): Likewise.
	(nios2_translate_pseudo_insn): Avoid dereferencing null pointer
	in error message.
	(nios2_ps_insn_info_structs): Add nop.n.
	(output_ubranch): Handle CDX branches.
	(output_cbranch): Likewise.
	(output_call): Handle R2 encodings.
	(output_movia): Likewise.
	(md_begin): Initialize nios2_min_align.
	(md_assemble): Align to nios2_min_align.  Adjust nios2_min_align
	if a 16-bit instruction is seen.
	(nios2_cons_align): Use appropriate nop pattern.

	include/opcode/
	* nios2.h (enum iw_format_type): Add R2 formats.
	(enum overflow_type): Add signed_immed12_overflow and
	enumeration_overflow for R2.
	(struct nios2_opcode): Document new argument letters for R2.
	(REG_3BIT, REG_LDWM, REG_POP): Define.
	(includes): Include nios2r2.h.
	(nios2_r2_opcodes, nios2_num_r2_opcodes): Declare.
	(nios2_r2_asi_n_mappings, nios2_num_r2_asi_n_mappings): Declare.
	(nios2_r2_shi_n_mappings, nios2_num_r2_shi_n_mappings): Declare.
	(nios2_r2_andi_n_mappings, nios2_num_r2_andi_n_mappings): Declare.
	(nios2_r2_reg3_mappings, nios2_num_r2_reg3_mappings): Declare.
	(nios2_r2_reg_range_mappings, nios2_num_r2_reg_range_mappings):
	Declare.
	* nios2r2.h: New file.

	opcodes/
	* nios2-dis.c (nios2_extract_opcode): New.
	(nios2_disassembler_state): New.
	(nios2_find_opcode_hash): Use mach parameter to select correct
	disassembler state.
	(nios2_print_insn_arg): Extend to support new R2 argument letters
	and formats.
	(print_insn_nios2): Check for 16-bit instruction at end of memory.
	* nios2-opc.c (nios2_builtin_regs): Add R2 register attributes.
	(NIOS2_NUM_OPCODES): Rename to...
	(NIOS2_NUM_R1_OPCODES): This.
	(nios2_r2_opcodes): New.
	(NIOS2_NUM_R2_OPCODES): New.
	(nios2_num_r2_opcodes): New.
	(nios2_r2_asi_n_mappings, nios2_num_r2_asi_n_mappings): New.
	(nios2_r2_shi_n_mappings, nios2_num_r2_shi_n_mappings): New.
	(nios2_r2_andi_n_mappings, nios2_num_r2_andi_n_mappings): New.
	(nios2_r2_reg3_mappings, nios2_num_r2_reg3_mappings): New.
	(nios2_r2_reg_range_mappings, nios2_num_r2_reg_range_mappings):	New.
---
 gas/ChangeLog            |   71 ++
 gas/config/tc-nios2.c    | 1575 ++++++++++++++++++++++++++++++++++----
 include/opcode/ChangeLog |   18 +
 include/opcode/nios2.h   |   79 +-
 include/opcode/nios2r2.h | 1081 ++++++++++++++++++++++++++
 opcodes/ChangeLog        |   22 +
 opcodes/nios2-dis.c      |  550 ++++++++++++-
 opcodes/nios2-opc.c      |  436 ++++++++++-
 8 files changed, 3634 insertions(+), 198 deletions(-)
 create mode 100644 include/opcode/nios2r2.h

diff --git a/gas/ChangeLog b/gas/ChangeLog
index 470cd9f7c1a..b18637fdbe7 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,74 @@
+2015-07-01  Sandra Loosemore  <sandra@codesourcery.com>
+	    Cesar Philippidis  <cesar@codesourcery.com>
+
+	* config/tc-nios2.c (nios2_min_align): New.
+	(nop): Replace with....
+	(nop_r1, nop_r2, nop_r2_cdx, nop32, nop16): New.
+	(nios2_align): Handle alignment on 2-byte boundaries when CDX
+	instructions may be present.
+	(s_nios2_align): Adjust reference to nop.
+	(CDXBRANCH, IS_CDXBRANCH): New.
+	(CDX_UBRANCH_SUBTYPE, CDX_CBRANCH_SUBTYPE): New.
+	(nios2_relax_subtype_size): Handle 2-byte CDX branches.
+	(nios2_relax_frag): Likewise.
+	(md_convert_frag): Handle R2 encodings.
+	(nios2_check_overflow): Check that low-order bits are zero
+	before applying rightshift from howto.
+	(nios2_check_overflow): Correct negative overflow calculation.
+	(nios2_diagnose_overflow): Handle signed_immed12_overflow.  Issue
+	generic overflow messages for miscellaneous instruction formats.
+	(md_apply_fix): Recognize new R2 relocations.  For pc_relative
+	relocations, store fixup in *valP.
+	(nios2_reglist_mask, nios2_reglist_dir): New.
+	(nios2_parse_reglist): New.
+	(nios2_parse_base_register): New.
+	(nios2_assemble_expression): Handle constant expressions designated
+	by BFD_RELOC_NONE.
+	(nios2_assemble_reg3): New.
+	(nios2_assemble_arg_c): Handle R2 instruction formats.
+	(nios2_assemble_arg_d): Likewise.
+	(nios2_assemble_arg_s): Likewise.
+	(nios2_assemble_arg_t): Likewise.
+	(nios2_assemble_arg_D): New.
+	(nios2_assemble_arg_S): New.
+	(nios2_assemble_arg_T): New.
+	(nios2_assemble_arg_i): Handle R2 instruction formats.
+	(nios2_assemble_arg_I): New.
+	(nios2_assemble_arg_u): Handle R2 instruction formats.
+	(nios2_assemble_arg_U): New.
+	(nios2_assemble_arg_V): New.
+	(nios2_assemble_arg_W): New.
+	(nios2_assemble_arg_X): New.
+	(nios2_assemble_arg_Y): New.
+	(nios2_assemble_arg_o): Handle R2 instruction formats.
+	(nios2_assemble_arg_O): New.
+	(nios2_assemble_arg_P): New.
+	(nios2_assemble_arg_j): Handle R2 instruction formats.
+	(nios2_assemble_arg_k): New.
+	(nios2_assemble_arg_l): Handle R2 instruction formats.
+	(nios2_assemble_arg_m): Likewise.
+	(nios2_assemble_arg_M): New.
+	(nios2_assemble_arg_N): New.
+	(nios2_assemble_arg_e): New.
+	(nios2_assemble_arg_f): New.
+	(nios2_assemble_arg_g): New.
+	(nios2_assemble_arg_h): New.
+	(nios2_assemble_arg_R): New.
+	(nios2_assemble_arg_B): New.
+	(nios2_assemble_args): Handle new argument letters.
+	(nios2_consume_arg): Likewise.
+	(nios2_translate_pseudo_insn): Avoid dereferencing null pointer
+	in error message.
+	(nios2_ps_insn_info_structs): Add nop.n.
+	(output_ubranch): Handle CDX branches.
+	(output_cbranch): Likewise.
+	(output_call): Handle R2 encodings.
+	(output_movia): Likewise.
+	(md_begin): Initialize nios2_min_align.
+	(md_assemble): Align to nios2_min_align.  Adjust nios2_min_align
+	if a 16-bit instruction is seen.
+	(nios2_cons_align): Use appropriate nop pattern.
+
 2015-07-01  Sandra Loosemore  <sandra@codesourcery.com>
 	    Cesar Philippidis  <cesar@codesourcery.com>
 
diff --git a/gas/config/tc-nios2.c b/gas/config/tc-nios2.c
index 549ca98f5f7..4488a4748bf 100644
--- a/gas/config/tc-nios2.c
+++ b/gas/config/tc-nios2.c
@@ -210,6 +210,11 @@ static int nios2_auto_align_on = 1;
    labels preceeding instructions.  */
 static symbolS *nios2_last_label;
 
+/* If we saw a 16-bit CDX instruction, we can align on 2-byte boundaries
+   instead of 4-bytes.  Use this to keep track of the minimum power-of-2
+   alignment.  */
+static int nios2_min_align = 2;
+
 #ifdef OBJ_ELF
 /* Pre-defined "_GLOBAL_OFFSET_TABLE_"	*/
 symbolS *GOT_symbol;
@@ -322,8 +327,12 @@ nios2_special_relocation_p (const char *str)
 }
 
 
-/* nop fill pattern for text section.  */
-static char const nop[4] = { 0x3a, 0x88, 0x01, 0x00 };
+/* nop fill patterns for text section.  */
+static char const nop_r1[4] = { 0x3a, 0x88, 0x01, 0x00 };
+static char const nop_r2[4] = { 0x20, 0x00, 0x00, 0xc4 };
+static char const nop_r2_cdx[2] = { 0x3b, 0x00 };
+static char const *nop32 = nop_r1;
+static char const *nop16 = NULL;
 
 /* Handles all machine-dependent alignment needs.  */
 static void
@@ -350,16 +359,26 @@ nios2_align (int log_size, const char *pfill, symbolS *label)
 
   if (align != 0)
     {
-      if (subseg_text_p (now_seg) && align >= 2)
+      if (subseg_text_p (now_seg) && align >= nios2_min_align)
 	{
-	  /* First, make sure we're on a four-byte boundary, in case
+	  /* First, make sure we're on the minimum boundary, in case
 	     someone has been putting .byte values the text section.  */
-	  if (nios2_current_align < 2 || switched_seg_p)
-	    frag_align (2, 0, 0);
+	  if (nios2_current_align < nios2_min_align || switched_seg_p)
+	    frag_align (nios2_min_align, 0, 0);
+
+	  /* If we might be on a 2-byte boundary, first align to a
+	     4-byte boundary using the 2-byte nop as fill.  */
+	  if (nios2_min_align == 1
+	      && align > nios2_min_align
+	      && pfill == nop32 )
+	    {
+	      gas_assert (nop16);
+	      frag_align_pattern (2, nop16, 2, 0);
+	    }
 
 	  /* Now fill in the alignment pattern.  */
 	  if (pfill != NULL)
-	    frag_align_pattern (align, pfill, sizeof nop, 0);
+	    frag_align_pattern (align, pfill, 4, 0);
 	  else
 	    frag_align (align, 0, 0);
 	}
@@ -470,7 +489,7 @@ s_nios2_align (int ignore ATTRIBUTE_UNUSED)
       pfill = (const char *) &fill;
     }
   else if (subseg_text_p (now_seg))
-    pfill = (const char *) &nop;
+    pfill = (const char *) nop32;
   else
     {
       pfill = NULL;
@@ -669,6 +688,11 @@ const pseudo_typeS md_pseudo_table[] = {
      jmp at
      skip:
    respectively.
+
+   16-bit CDX branch instructions are relaxed first into equivalent
+   32-bit branches and then the above transformations are applied
+   if necessary.  
+
 */
 
 /* Arbitrarily limit the number of addis we can insert; we need to be able
@@ -685,7 +709,7 @@ const pseudo_typeS md_pseudo_table[] = {
 /* The fr_subtype field represents the target-specific relocation state.
    It has type relax_substateT (unsigned int).  We use it to track the
    number of addis necessary, plus a bit to track whether this is a
-   conditional branch.
+   conditional branch and a bit for 16-bit CDX instructions.
    Regardless of the smaller RELAX_MAX_ADDI limit, we reserve 16 bits
    in the fr_subtype to encode the number of addis so that the whole
    theoretically-valid range is representable.
@@ -693,10 +717,14 @@ const pseudo_typeS md_pseudo_table[] = {
    represents a branch that needs to be relaxed.  */
 #define UBRANCH (0 << 16)
 #define CBRANCH (1 << 16)
+#define CDXBRANCH (1 << 17)
 #define IS_CBRANCH(SUBTYPE) ((SUBTYPE) & CBRANCH)
 #define IS_UBRANCH(SUBTYPE) (!IS_CBRANCH (SUBTYPE))
+#define IS_CDXBRANCH(SUBTYPE) ((SUBTYPE) & CDXBRANCH)
 #define UBRANCH_SUBTYPE(N) (UBRANCH | (N))
 #define CBRANCH_SUBTYPE(N) (CBRANCH | (N))
+#define CDX_UBRANCH_SUBTYPE(N) (CDXBRANCH | UBRANCH | (N))
+#define CDX_CBRANCH_SUBTYPE(N) (CDXBRANCH | CBRANCH | (N))
 #define SUBTYPE_ADDIS(SUBTYPE) ((SUBTYPE) & 0xffff)
 
 /* For the -relax-section mode, unconditional branches require 2 extra i
@@ -730,7 +758,7 @@ nios2_relax_subtype_size (relax_substateT subtype)
   int n = SUBTYPE_ADDIS (subtype);
   if (n == 0)
     /* Regular conditional/unconditional branch instruction.  */
-    return 4;
+    return (IS_CDXBRANCH (subtype) ? 2 : 4);
   else if (nios2_as_options.relax == relax_all)
     return (IS_CBRANCH (subtype) ? CBRANCH_JUMP_SIZE : UBRANCH_JUMP_SIZE);
   else if (IS_CBRANCH (subtype))
@@ -761,6 +789,7 @@ nios2_relax_frag (segT segment, fragS *fragp, long stretch)
       fragS *sym_frag = symbol_get_frag (symbolp);
       offsetT offset;
       int n;
+      bfd_boolean is_cdx = FALSE;
 
       target += S_GET_VALUE (symbolp);
 
@@ -777,7 +806,15 @@ nios2_relax_frag (segT segment, fragS *fragp, long stretch)
       /* We subtract fr_var (4 for 32-bit insns) because all pc relative
 	 branches are from the next instruction.  */
       offset = target - fragp->fr_address - fragp->fr_fix - fragp->fr_var;
-      if (offset >= -32768 && offset <= 32764)
+      if (IS_CDXBRANCH (subtype) && IS_UBRANCH (subtype)
+	  && offset >= -1024 && offset < 1024)
+	/* PC-relative CDX branch with 11-bit offset.  */
+	is_cdx = TRUE;
+      else if (IS_CDXBRANCH (subtype) && IS_CBRANCH (subtype)
+	       && offset >= -128 && offset < 128)
+	/* PC-relative CDX branch with 8-bit offset.  */
+	is_cdx = TRUE;
+      else if (offset >= -32768 && offset < 32768)
 	/* Fits in PC-relative branch.  */
 	n = 0;
       else if (nios2_as_options.relax == relax_all)
@@ -816,7 +853,9 @@ nios2_relax_frag (segT segment, fragS *fragp, long stretch)
 	/* We cannot handle this case, diagnose overflow later.  */
 	return 0;
 
-      if (IS_CBRANCH (subtype))
+      if (is_cdx)
+	fragp->fr_subtype = subtype;
+      else if (IS_CBRANCH (subtype))
 	fragp->fr_subtype = CBRANCH_SUBTYPE (n);
       else
 	fragp->fr_subtype = UBRANCH_SUBTYPE (n);
@@ -841,16 +880,50 @@ md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, segT segment ATTRIBUTE_UNUSED,
   addressT target = fragp->fr_offset;
   symbolS *symbolp = fragp->fr_symbol;
   offsetT offset;
-  unsigned int addend_mask, addi_mask;
+  unsigned int addend_mask, addi_mask, op;
   offsetT addend, remainder;
   int i;
+  bfd_boolean is_r2 = (bfd_get_mach (stdoutput) == bfd_mach_nios2r2);
+
+  /* If this is a CDX branch we're not relaxing, just generate the fixup.  */
+  if (IS_CDXBRANCH (subtype))
+    {
+      gas_assert (is_r2);
+      fix_new (fragp, fragp->fr_fix, 2, fragp->fr_symbol,
+	       fragp->fr_offset, 1,
+	       (IS_UBRANCH (subtype)
+		? BFD_RELOC_NIOS2_R2_I10_1_PCREL
+		: BFD_RELOC_NIOS2_R2_T1I7_1_PCREL));
+      fragp->fr_fix += 2;
+      return;
+    }
+
+  /* If this is a CDX branch we are relaxing, turn it into an equivalent
+     32-bit branch and then fall through to the normal non-CDX cases.  */
+  if (fragp->fr_var == 2)
+    {
+      unsigned int opcode = md_chars_to_number (buffer, 2);
+      gas_assert (is_r2);
+      if (IS_CBRANCH (subtype))
+	{
+	  unsigned int reg = nios2_r2_reg3_mappings[GET_IW_T1I7_A3 (opcode)];
+	  if (GET_IW_R2_OP (opcode) == R2_OP_BNEZ_N)
+	    opcode = MATCH_R2_BNE | SET_IW_F2I16_A (reg);
+	  else
+	    opcode = MATCH_R2_BEQ | SET_IW_F2I16_A (reg);
+	}
+      else
+	opcode = MATCH_R2_BR;
+      md_number_to_chars (buffer, opcode, 4);
+      fragp->fr_var = 4;
+    }
 
   /* If we didn't or can't relax, this is a regular branch instruction.
      We just need to generate the fixup for the symbol and offset.  */
   if (n == 0)
     {
-      fix_new (fragp, fragp->fr_fix, 4, fragp->fr_symbol, fragp->fr_offset, 1,
-	       BFD_RELOC_16_PCREL);
+      fix_new (fragp, fragp->fr_fix, 4, fragp->fr_symbol,
+	       fragp->fr_offset, 1, BFD_RELOC_16_PCREL);
       fragp->fr_fix += 4;
       return;
     }
@@ -871,35 +944,66 @@ md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, segT segment ATTRIBUTE_UNUSED,
 	nbytes = 12;
 
       br_opcode = md_chars_to_number (buffer, 4);
-      old_op = GET_IW_R1_OP (br_opcode);
-      switch (old_op)
+      if (is_r2)
 	{
-	case R1_OP_BEQ:
-	  new_op = R1_OP_BNE;
-	  break;
-	case R1_OP_BNE:
-	  new_op = R1_OP_BEQ;
-	  break;
-	case R1_OP_BGE:
-	  new_op = R1_OP_BLT;
-	  break;
-	case R1_OP_BGEU:
-	  new_op = R1_OP_BLTU;
-	  break;
-	case R1_OP_BLT:
-	  new_op = R1_OP_BGE;
-	  break;
-	case R1_OP_BLTU:
-	  new_op = R1_OP_BGEU;
-	  break;
-	default:
-	  as_bad_where (fragp->fr_file, fragp->fr_line,
-			_("expecting conditional branch for relaxation\n"));
-	  abort ();
+	  old_op = GET_IW_R2_OP (br_opcode);
+	  switch (old_op)
+	    {
+	    case R2_OP_BEQ:
+	      new_op = R2_OP_BNE;
+	      break;
+	    case R2_OP_BNE:
+	      new_op = R2_OP_BEQ;
+	      break;
+	    case R2_OP_BGE:
+	      new_op = R2_OP_BLT;
+	      break;
+	    case R2_OP_BGEU:
+	      new_op = R2_OP_BLTU;
+	      break;
+	    case R2_OP_BLT:
+	      new_op = R2_OP_BGE;
+	      break;
+	    case R2_OP_BLTU:
+	      new_op = R2_OP_BGEU;
+	      break;
+	    default:
+	      abort ();
+	    }
+	  br_opcode = ((br_opcode & ~IW_R2_OP_SHIFTED_MASK)
+		       | SET_IW_R2_OP (new_op));
+	  br_opcode = br_opcode | SET_IW_F2I16_IMM16 (nbytes);
+	}
+      else
+	{
+	  old_op = GET_IW_R1_OP (br_opcode);
+	  switch (old_op)
+	    {
+	    case R1_OP_BEQ:
+	      new_op = R1_OP_BNE;
+	      break;
+	    case R1_OP_BNE:
+	      new_op = R1_OP_BEQ;
+	      break;
+	    case R1_OP_BGE:
+	      new_op = R1_OP_BLT;
+	      break;
+	    case R1_OP_BGEU:
+	      new_op = R1_OP_BLTU;
+	      break;
+	    case R1_OP_BLT:
+	      new_op = R1_OP_BGE;
+	      break;
+	    case R1_OP_BLTU:
+	      new_op = R1_OP_BGEU;
+	      break;
+	    default:
+	      abort ();
+	    }
+	  br_opcode = ((br_opcode & ~IW_R1_OP_SHIFTED_MASK)
+		       | SET_IW_R1_OP (new_op));
+	  br_opcode = br_opcode | SET_IW_I_IMM16 (nbytes);
 	}
-
-      br_opcode = (br_opcode & ~IW_R1_OP_SHIFTED_MASK) | SET_IW_R1_OP (new_op);
-      br_opcode = br_opcode | SET_IW_I_IMM16 (nbytes);
       md_number_to_chars (buffer, br_opcode, 4);
       fragp->fr_fix += 4;
       buffer += 4;
@@ -909,8 +1013,11 @@ md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, segT segment ATTRIBUTE_UNUSED,
   if (nios2_as_options.relax == relax_section)
     {
       /* Insert the nextpc instruction.  */
-      md_number_to_chars (buffer,
-			  MATCH_R1_NEXTPC | SET_IW_R_C (AT_REGNUM), 4);
+      if (is_r2)
+	op = MATCH_R2_NEXTPC | SET_IW_F3X6L5_C (AT_REGNUM);
+      else
+	op = MATCH_R1_NEXTPC | SET_IW_R_C (AT_REGNUM);
+      md_number_to_chars (buffer, op, 4);
       fragp->fr_fix += 4;
       buffer += 4;
   
@@ -921,12 +1028,20 @@ md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, segT segment ATTRIBUTE_UNUSED,
 	addend = 32767;
       else
 	addend = -32768;
-      addend_mask = SET_IW_I_IMM16 ((unsigned int)addend);
+      if (is_r2)
+	addend_mask = SET_IW_F2I16_IMM16 ((unsigned int)addend);
+      else
+	addend_mask = SET_IW_I_IMM16 ((unsigned int)addend);
 
       /* Insert n-1 addi instructions.  */
-      addi_mask = (MATCH_R1_ADDI
-		   | SET_IW_I_B (AT_REGNUM)
-		   | SET_IW_I_A (AT_REGNUM));
+      if (is_r2)
+	addi_mask = (MATCH_R2_ADDI
+		     | SET_IW_F2I16_B (AT_REGNUM)
+		     | SET_IW_F2I16_A (AT_REGNUM));
+      else
+	addi_mask = (MATCH_R1_ADDI
+		     | SET_IW_I_B (AT_REGNUM)
+		     | SET_IW_I_A (AT_REGNUM));
       for (i = 0; i < n - 1; i ++)
 	{
 	  md_number_to_chars (buffer, addi_mask | addend_mask, 4);
@@ -937,7 +1052,10 @@ md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, segT segment ATTRIBUTE_UNUSED,
       /* Insert the last addi instruction to hold the remainder.  */
       remainder = offset - addend * (n - 1);
       gas_assert (remainder >= -32768 && remainder <= 32767);
-      addend_mask = SET_IW_I_IMM16 ((unsigned int)remainder);
+      if (is_r2)
+	addend_mask = SET_IW_F2I16_IMM16 ((unsigned int)remainder);
+      else
+	addend_mask = SET_IW_I_IMM16 ((unsigned int)remainder);
       md_number_to_chars (buffer, addi_mask | addend_mask, 4);
       fragp->fr_fix += 4;
       buffer += 4;
@@ -946,18 +1064,22 @@ md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, segT segment ATTRIBUTE_UNUSED,
   /* Load at for the absolute case.  */
   else
     {
-      md_number_to_chars (buffer,
-			  (MATCH_R1_ORHI | SET_IW_I_B (AT_REGNUM)
-			   | SET_IW_I_A (0)),
-			  4);
+      if (is_r2)
+	op = MATCH_R2_ORHI | SET_IW_F2I16_B (AT_REGNUM) | SET_IW_F2I16_A (0);
+      else
+	op = MATCH_R1_ORHI | SET_IW_I_B (AT_REGNUM) | SET_IW_I_A (0);
+      md_number_to_chars (buffer, op, 4);
       fix_new (fragp, fragp->fr_fix, 4, fragp->fr_symbol, fragp->fr_offset,
 	       0, BFD_RELOC_NIOS2_HI16);
       fragp->fr_fix += 4;
       buffer += 4;
-      md_number_to_chars (buffer,
-			  (MATCH_R1_ORI | SET_IW_I_B (AT_REGNUM)
-			   | SET_IW_I_A (AT_REGNUM)),
-			  4);
+      if (is_r2)
+	op = (MATCH_R2_ORI | SET_IW_F2I16_B (AT_REGNUM)
+	      | SET_IW_F2I16_A (AT_REGNUM));
+      else
+	op = (MATCH_R1_ORI | SET_IW_I_B (AT_REGNUM)
+	      | SET_IW_I_A (AT_REGNUM));
+      md_number_to_chars (buffer, op, 4);
       fix_new (fragp, fragp->fr_fix, 4, fragp->fr_symbol, fragp->fr_offset,
 	       0, BFD_RELOC_NIOS2_LO16);
       fragp->fr_fix += 4;
@@ -965,7 +1087,11 @@ md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, segT segment ATTRIBUTE_UNUSED,
     }
 
   /* Insert the jmp instruction.  */
-  md_number_to_chars (buffer, MATCH_R1_JMP | SET_IW_R_A (AT_REGNUM), 4);
+  if (is_r2)
+    op = MATCH_R2_JMP | SET_IW_F3X6L5_A (AT_REGNUM);
+  else
+    op = MATCH_R1_JMP | SET_IW_R_A (AT_REGNUM);
+  md_number_to_chars (buffer, op, 4);
   fragp->fr_fix += 4;
   buffer += 4;
 }
@@ -977,8 +1103,15 @@ md_convert_frag (bfd *headers ATTRIBUTE_UNUSED, segT segment ATTRIBUTE_UNUSED,
 static bfd_boolean
 nios2_check_overflow (valueT fixup, reloc_howto_type *howto)
 {
-  /* Apply the rightshift before checking for overflow.  */
-  fixup = ((signed)fixup) >> howto->rightshift;
+  /* If there is a rightshift, check that the low-order bits are
+     zero before applying it.  */
+  if (howto->rightshift)
+    {
+      if ((~(~((valueT) 0) << howto->rightshift) & fixup)
+	  && howto->complain_on_overflow != complain_overflow_dont)
+	return TRUE;
+      fixup = ((signed)fixup) >> howto->rightshift;
+    }
 
   /* Check for overflow - return TRUE if overflow, FALSE if not.  */
   switch (howto->complain_on_overflow)
@@ -994,7 +1127,7 @@ nios2_check_overflow (valueT fixup, reloc_howto_type *howto)
       if ((fixup & 0x80000000) > 0)
 	{
 	  /* Check for negative overflow.  */
-	  if ((signed) fixup < ((signed) 0x80000000 >> howto->bitsize))
+	  if ((signed) fixup < ((signed) ~0 << (howto->bitsize-1)))
 	    return TRUE;
 	}
       else
@@ -1056,14 +1189,24 @@ nios2_diagnose_overflow (valueT fixup, reloc_howto_type *howto,
 			address, range_min, range_max);
 	  break;
 	case branch_target_overflow:
-	  as_bad_where (fixP->fx_file, fixP->fx_line,
-			_("branch offset %d out of range %d to %d"),
-			(int)fixup, -32768, 32767);
+	  if (opcode->format == iw_i_type || opcode->format == iw_F2I16_type)
+	    as_bad_where (fixP->fx_file, fixP->fx_line,
+			  _("branch offset %d out of range %d to %d"),
+			  (int)fixup, -32768, 32767);
+	  else
+	    as_bad_where (fixP->fx_file, fixP->fx_line,
+			  _("branch offset %d out of range"),
+			  (int)fixup);
 	  break;
 	case address_offset_overflow:
-	  as_bad_where (fixP->fx_file, fixP->fx_line,
-			_("%s offset %d out of range %d to %d"),
-			opcode->name, (int)fixup, -32768, 32767);
+	  if (opcode->format == iw_i_type || opcode->format == iw_F2I16_type)
+	    as_bad_where (fixP->fx_file, fixP->fx_line,
+			  _("%s offset %d out of range %d to %d"),
+			  opcode->name, (int)fixup, -32768, 32767);
+	  else
+	    as_bad_where (fixP->fx_file, fixP->fx_line,
+			  _("%s offset %d out of range"),
+			  opcode->name, (int)fixup);
 	  break;
 	case signed_immed16_overflow:
 	  as_bad_where (fixP->fx_file, fixP->fx_line,
@@ -1080,6 +1223,11 @@ nios2_diagnose_overflow (valueT fixup, reloc_howto_type *howto,
 			_("immediate value %u out of range %u to %u"),
 			(unsigned int)fixup, 0, 31);
 	  break;
+	case signed_immed12_overflow:
+	  as_bad_where (fixP->fx_file, fixP->fx_line,
+			_("immediate value %d out of range %d to %d"),
+			(int)fixup, -2048, 2047);
+	  break;
 	case custom_opcode_overflow:
 	  as_bad_where (fixP->fx_file, fixP->fx_line,
 			_("custom instruction opcode %u out of range %u to %u"),
@@ -1137,6 +1285,19 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED)
 		  || fixP->fx_r_type == BFD_RELOC_NIOS2_GOT_HA
 		  || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL_LO
 		  || fixP->fx_r_type == BFD_RELOC_NIOS2_CALL_HA
+		  || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_S12
+		  || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_I10_1_PCREL
+		  || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T1I7_1_PCREL
+		  || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T1I7_2
+		  || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T2I4
+		  || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T2I4_1
+		  || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T2I4_2
+		  || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_X1I7_2
+		  || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_X2L5
+		  || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_F1I5_2
+		  || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_L5I4X1
+		  || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T1X1I6
+		  || fixP->fx_r_type == BFD_RELOC_NIOS2_R2_T1X1I6_2
 		  /* Add other relocs here as we generate them.  */
 		  ));
 
@@ -1208,8 +1369,11 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED)
 	     FIXME : for some reason fixP->fx_pcrel isn't 1 when it should be
 	     so I'm using the howto structure instead to determine this.  */
 	  if (howto->pc_relative == 1)
-	    fixup = fixup - (fixP->fx_frag->fr_address + fixP->fx_where
-			     + fixP->fx_size);
+	    {
+	      fixup = (fixup - (fixP->fx_frag->fr_address + fixP->fx_where
+				+ fixP->fx_size));
+	      *valP = fixup;
+	    }
 
 	  /* Get the instruction or data to be fixed up.  */
 	  buf = fixP->fx_frag->fr_literal + fixP->fx_where;
@@ -1390,6 +1554,198 @@ nios2_parse_reg (const char *token, unsigned long regtype)
   return reg;
 }
 
+/* This function parses a reglist for ldwm/stwm and push.n/pop.n
+   instructions, given as a brace-enclosed register list.  The tokenizer
+   has replaced commas in the token with spaces.
+   The return value is a bitmask of registers in the set.  It also
+   sets nios2_reglist_mask and nios2_reglist_dir to allow error checking
+   when parsing the base register.  */
+
+static unsigned long nios2_reglist_mask;
+static int nios2_reglist_dir;
+
+static unsigned long
+nios2_parse_reglist (char *token, const struct nios2_opcode *op)
+{
+  unsigned long mask = 0;
+  int dir = 0;
+  unsigned long regtype = 0;
+  int last = -1;
+  const char *regname;
+
+  nios2_reglist_mask = 0;
+  nios2_reglist_dir = 0;
+
+  if (op->match == MATCH_R2_LDWM || op->match == MATCH_R2_STWM)
+    {
+      regtype = REG_LDWM;
+      dir = 0;
+    }
+  else if (op->match == MATCH_R2_PUSH_N)
+    {
+      regtype = REG_POP;
+      dir = -1;
+    }
+  else if (op->match == MATCH_R2_POP_N)
+    {
+      regtype = REG_POP;
+      dir = 1;
+    }
+  else
+    bad_opcode (op);
+
+  for (regname = strtok (token, "{ }");
+       regname;
+       regname = strtok (NULL, "{ }"))
+    {
+      int regno;
+      struct nios2_reg *reg = nios2_parse_reg (regname, regtype);
+
+      if (!reg)
+	break;
+      regno = reg->index;
+
+      /* Make sure registers are listed in proper sequence.  */
+      if (last >= 0)
+	{
+	  if (regno == last)
+	    {
+	      as_bad ("duplicate register %s\n", reg->name);
+	      return 0;
+	    }
+	  else if (dir == 0)
+	    dir = (regno < last ? -1 : 1);
+	  else if ((dir > 0 && regno < last)
+		   || (dir < 0 && regno > last)
+		   || (op->match == MATCH_R2_PUSH_N
+		       && ! ((last == 31 && regno == 28)
+			     || (last == 31 && regno <= 23)
+			     || (last == 28 && regno <= 23)
+			     || (regno < 23 && regno == last - 1)))
+		   || (op->match == MATCH_R2_POP_N
+		       && ! ((regno == 31 && last == 28)
+			     || (regno == 31 && last <= 23)
+			     || (regno == 28 && last <= 23)
+			     || (last < 23 && last == regno - 1))))
+	    {
+	      as_bad ("invalid register order");
+	      return 0;
+	    }
+	}
+
+      mask |= 1 << regno;
+      last = regno;
+    }
+
+  /* Check that all ldwm/stwm regs belong to the same set.  */
+  if ((op->match == MATCH_R2_LDWM || op->match == MATCH_R2_STWM)
+      && (mask & 0x00003ffc) && (mask & 0x90ffc000))
+    {
+      as_bad ("invalid register set in reglist");
+      return 0;
+    }
+
+  /* Check that push.n/pop.n regs include RA.  */
+  if ((op->match == MATCH_R2_PUSH_N || op->match == MATCH_R2_POP_N)
+      && ((mask & 0x80000000) == 0))
+    {
+      as_bad ("reglist must include ra (r31)");
+      return 0;
+    }
+
+  /* Check that there is at least one register in the set.  */
+  if (!mask)
+    {
+      as_bad ("reglist must include at least one register");
+      return 0;
+    }
+
+  /* OK, reglist passed validation.  */
+  nios2_reglist_mask = mask;
+  nios2_reglist_dir = dir;
+  return mask;
+}
+
+/* This function parses the base register and options used by the ldwm/stwm
+   instructions.  Returns the base register and sets the option arguments
+   accordingly.  On failure, returns NULL.  */
+static struct nios2_reg *
+nios2_parse_base_register (char *str, int *direction, int *writeback, int *ret)
+{
+  char *regname;
+  struct nios2_reg *reg;
+
+  *direction = 0;
+  *writeback = 0;
+  *ret = 0;
+
+  /* Check for --.  */
+  if (strncmp (str, "--", 2) == 0)
+    {
+      str += 2;
+      *direction -= 1;
+    }
+
+  /* Extract the base register.  */
+  if (*str != '(')
+    {
+      as_bad ("expected '(' before base register");
+      return NULL;
+    }
+  str++;
+  regname = str;
+  str = strchr (str, ')');
+  if (!str)
+    {
+      as_bad ("expected ')' after base register");
+      return NULL;
+    }
+  *str = '\0';
+  str++;
+  reg = nios2_parse_reg (regname, REG_NORMAL);
+  if (reg == NULL)
+    return NULL;
+
+  /* Check for ++.  */
+  if (strncmp (str, "++", 2) == 0)
+    {
+      str += 2;
+      *direction += 1;
+    }
+
+  /* Ensure that either -- or ++ is specified, but not both.  */
+  if (*direction == 0)
+    {
+      as_bad ("invalid base register syntax");
+      return NULL;;
+    }
+
+  /* Check for options.  The tokenizer has replaced commas with spaces.  */
+  while (*str)
+    {
+      while (*str == ' ')
+	str++;
+      if (strncmp (str, "writeback", 9) == 0)
+	{
+	  *writeback = 1;
+	  str += 9;
+	}
+      else if (strncmp (str, "ret", 3) == 0)
+	{
+	  *ret = 1;
+	  str += 3;
+	}
+      else if (*str)
+	{
+	  as_bad ("invalid option syntax");
+	  return NULL;
+	}
+    }
+
+  return reg;
+}
+
+
 /* The various nios2_assemble_* functions call this
    function to generate an expression from a string representing an expression.
    It then tries to evaluate the expression, and if it can, returns its value.
@@ -1398,13 +1754,14 @@ nios2_parse_reg (const char *token, unsigned long regtype)
 static unsigned long
 nios2_assemble_expression (const char *exprstr,
 			   nios2_insn_infoS *insn,
-			   bfd_reloc_code_real_type reloc_type,
+			   bfd_reloc_code_real_type orig_reloc_type,
 			   unsigned int pcrel)
 {
   nios2_insn_relocS *reloc;
   char *saved_line_ptr;
-  unsigned short value;
+  unsigned long value = 0;
   int i;
+  bfd_reloc_code_real_type reloc_type = orig_reloc_type;
 
   gas_assert (exprstr != NULL);
   gas_assert (insn != NULL);
@@ -1431,6 +1788,25 @@ nios2_assemble_expression (const char *exprstr,
 	break;
       }
 
+  /* No relocation allowed; we must have a constant expression.  */
+  if (orig_reloc_type == BFD_RELOC_NONE)
+    {
+      expressionS exp;
+
+      /* Parse the expression string.  */
+      saved_line_ptr = input_line_pointer;
+      input_line_pointer = (char *) exprstr;
+      expression (&exp);
+      input_line_pointer = saved_line_ptr;
+
+      /* If we don't have a constant, give an error.  */
+      if (reloc_type != orig_reloc_type || exp.X_op != O_constant)
+	as_bad (_("expression must be constant"));
+      else
+	value = exp.X_add_number;
+      return (unsigned long) value;
+    }
+
   /* We potentially have a relocation.  */
   reloc = nios2_insn_reloc_new (reloc_type, pcrel);
   reloc->reloc_next = insn->insn_reloc;
@@ -1445,7 +1821,6 @@ nios2_assemble_expression (const char *exprstr,
   /* This is redundant as the fixup will put this into
      the instruction, but it is included here so that
      self-test mode (-r) works.  */
-  value = 0;
   if (nios2_mode == NIOS2_MODE_TEST
       && reloc->reloc_expression.X_op == O_constant)
     value = reloc->reloc_expression.X_add_number;
@@ -1453,8 +1828,29 @@ nios2_assemble_expression (const char *exprstr,
   return (unsigned long) value;
 }
 
+/* Encode a 3-bit register number, giving an error if this is not possible.  */
+static unsigned int
+nios2_assemble_reg3 (const char *token)
+{
+  struct nios2_reg *reg = nios2_parse_reg (token, REG_3BIT);
+  int j;
+
+  if (reg == NULL)
+    return 0;
+
+  for (j = 0; j < nios2_num_r2_reg3_mappings; j++)
+    if (nios2_r2_reg3_mappings[j] == reg->index)
+      return j;
+
+  /* Should never get here if we passed validation.  */
+  as_bad (_("invalid register %s"), token);
+  return 0;
+}
 
 /* Argument assemble functions.  */
+
+
+/* Control register index.  */
 static void 
 nios2_assemble_arg_c (const char *token, nios2_insn_infoS *insn)
 {
@@ -1469,11 +1865,15 @@ nios2_assemble_arg_c (const char *token, nios2_insn_infoS *insn)
     case iw_r_type:
       insn->insn_code |= SET_IW_R_IMM5 (reg->index);
       break;
+    case iw_F3X6L5_type:
+      insn->insn_code |= SET_IW_F3X6L5_IMM5 (reg->index);
+      break;
     default:
       bad_opcode (op);
     }
 }
 
+/* Destination register.  */
 static void 
 nios2_assemble_arg_d (const char *token, nios2_insn_infoS *insn)
 {
@@ -1481,7 +1881,7 @@ nios2_assemble_arg_d (const char *token, nios2_insn_infoS *insn)
   unsigned long regtype = REG_NORMAL;
   struct nios2_reg *reg;
 
-  if (op->format == iw_custom_type)
+  if (op->format == iw_custom_type || op->format == iw_F3X8_type)
     regtype |= REG_COPROCESSOR;
   reg = nios2_parse_reg (token, regtype);
   if (reg == NULL)
@@ -1499,11 +1899,26 @@ nios2_assemble_arg_d (const char *token, nios2_insn_infoS *insn)
       else
 	insn->insn_code |= SET_IW_CUSTOM_READC (1);
       break;
+    case iw_F3X6L5_type:
+    case iw_F3X6_type:
+      insn->insn_code |= SET_IW_F3X6L5_C (reg->index);
+      break;
+    case iw_F3X8_type:
+      insn->insn_code |= SET_IW_F3X8_C (reg->index);
+      if (reg->regtype & REG_COPROCESSOR)
+	insn->insn_code |= SET_IW_F3X8_READC (0);
+      else
+	insn->insn_code |= SET_IW_F3X8_READC (1);
+      break;
+    case iw_F2_type:
+      insn->insn_code |= SET_IW_F2_B (reg->index);
+      break;
     default:
       bad_opcode (op);
     }
 }
 
+/* Source register 1.  */
 static void 
 nios2_assemble_arg_s (const char *token, nios2_insn_infoS *insn)
 {
@@ -1511,7 +1926,7 @@ nios2_assemble_arg_s (const char *token, nios2_insn_infoS *insn)
   unsigned long regtype = REG_NORMAL;
   struct nios2_reg *reg;
 
-  if (op->format == iw_custom_type)
+  if (op->format == iw_custom_type || op->format == iw_F3X8_type)
     regtype |= REG_COPROCESSOR;
   reg = nios2_parse_reg (token, regtype);
   if (reg == NULL)
@@ -1520,6 +1935,8 @@ nios2_assemble_arg_s (const char *token, nios2_insn_infoS *insn)
   switch (op->format)
     {
     case iw_r_type:
+      if (op->match == MATCH_R1_JMP && reg->index == 31)
+	as_bad (_("r31 cannot be used with jmp; use ret instead"));
       insn->insn_code |= SET_IW_R_A (reg->index);
       break;
     case iw_i_type:
@@ -1532,11 +1949,53 @@ nios2_assemble_arg_s (const char *token, nios2_insn_infoS *insn)
       else
 	insn->insn_code |= SET_IW_CUSTOM_READA (1);
       break;
+    case iw_F2I16_type:
+      insn->insn_code |= SET_IW_F2I16_A (reg->index);
+      break;
+    case iw_F2X4I12_type:
+      insn->insn_code |= SET_IW_F2X4I12_A (reg->index);
+      break;
+    case iw_F1X4I12_type:
+      insn->insn_code |= SET_IW_F1X4I12_A (reg->index);
+      break;
+    case iw_F1X4L17_type:
+      insn->insn_code |= SET_IW_F1X4L17_A (reg->index);
+      break;
+    case iw_F3X6L5_type:
+    case iw_F3X6_type:
+      if (op->match == MATCH_R2_JMP && reg->index == 31)
+	as_bad (_("r31 cannot be used with jmp; use ret instead"));
+      insn->insn_code |= SET_IW_F3X6L5_A (reg->index);
+      break;
+    case iw_F2X6L10_type:
+      insn->insn_code |= SET_IW_F2X6L10_A (reg->index);
+      break;
+    case iw_F3X8_type:
+      insn->insn_code |= SET_IW_F3X8_A (reg->index);
+      if (reg->regtype & REG_COPROCESSOR)
+	insn->insn_code |= SET_IW_F3X8_READA (0);
+      else
+	insn->insn_code |= SET_IW_F3X8_READA (1);
+      break;
+    case iw_F1X1_type:
+      if (op->match == MATCH_R2_JMPR_N && reg->index == 31)
+	as_bad (_("r31 cannot be used with jmpr.n; use ret.n instead"));
+      insn->insn_code |= SET_IW_F1X1_A (reg->index);
+      break;
+    case iw_F1I5_type:
+      /* Implicit stack pointer reference.  */
+      if (reg->index != 27)
+	as_bad (_("invalid register %s"), token);
+      break;
+    case iw_F2_type:
+      insn->insn_code |= SET_IW_F2_A (reg->index);
+      break;
     default:
       bad_opcode (op);
     }
 }
 
+/* Source register 2.  */
 static void 
 nios2_assemble_arg_t (const char *token, nios2_insn_infoS *insn)
 {
@@ -1544,7 +2003,7 @@ nios2_assemble_arg_t (const char *token, nios2_insn_infoS *insn)
   unsigned long regtype = REG_NORMAL;
   struct nios2_reg *reg;
 
-  if (op->format == iw_custom_type)
+  if (op->format == iw_custom_type || op->format == iw_F3X8_type)
     regtype |= REG_COPROCESSOR;
   reg = nios2_parse_reg (token, regtype);
   if (reg == NULL)
@@ -1565,110 +2024,498 @@ nios2_assemble_arg_t (const char *token, nios2_insn_infoS *insn)
       else
 	insn->insn_code |= SET_IW_CUSTOM_READB (1);
       break;
+    case iw_F2I16_type:
+      insn->insn_code |= SET_IW_F2I16_B (reg->index);
+      break;
+    case iw_F2X4I12_type:
+      insn->insn_code |= SET_IW_F2X4I12_B (reg->index);
+      break;
+    case iw_F3X6L5_type:
+    case iw_F3X6_type:
+      insn->insn_code |= SET_IW_F3X6L5_B (reg->index);
+      break;
+    case iw_F2X6L10_type:
+      insn->insn_code |= SET_IW_F2X6L10_B (reg->index);
+      break;
+    case iw_F3X8_type:
+      insn->insn_code |= SET_IW_F3X8_B (reg->index);
+      if (reg->regtype & REG_COPROCESSOR)
+	insn->insn_code |= SET_IW_F3X8_READB (0);
+      else
+	insn->insn_code |= SET_IW_F3X8_READB (1);
+      break;
+    case iw_F1I5_type:
+      insn->insn_code |= SET_IW_F1I5_B (reg->index);
+      break;
+    case iw_F2_type:
+      insn->insn_code |= SET_IW_F2_B (reg->index);
+      break;
+    case iw_T1X1I6_type:
+      /* Implicit zero register reference.  */
+      if (reg->index != 0)
+	as_bad (_("invalid register %s"), token);
+      break;
+
     default:
       bad_opcode (op);
     }
 }
 
+/* Destination register w/3-bit encoding.  */
 static void 
-nios2_assemble_arg_i (const char *token, nios2_insn_infoS *insn)
+nios2_assemble_arg_D (const char *token, nios2_insn_infoS *insn)
 {
   const struct nios2_opcode *op = insn->insn_nios2_opcode;
-  unsigned int val;
-
+  int reg = nios2_assemble_reg3 (token);
+  
   switch (op->format)
     {
-    case iw_i_type:
-      val = nios2_assemble_expression (token, insn,
-				       BFD_RELOC_NIOS2_S16, 0);
-      insn->constant_bits |= SET_IW_I_IMM16 (val);
+    case iw_T1I7_type:
+      insn->insn_code |= SET_IW_T1I7_A3 (reg);
+      break;
+    case iw_T2X1L3_type:
+      insn->insn_code |= SET_IW_T2X1L3_B3 (reg);
+      break;
+    case iw_T2X1I3_type:
+      insn->insn_code |= SET_IW_T2X1I3_B3 (reg);
+      break;
+    case iw_T3X1_type:
+      insn->insn_code |= SET_IW_T3X1_C3 (reg);
+      break;
+    case iw_T2X3_type:
+      /* Some instructions using this encoding take 3 register arguments,
+	 requiring the destination register to be the same as the first
+	 source register.  */
+      if (op->num_args == 3)
+	insn->insn_code |= SET_IW_T2X3_A3 (reg);
+      else
+	insn->insn_code |= SET_IW_T2X3_B3 (reg);
       break;
     default:
       bad_opcode (op);
     }
 }
 
+/* Source register w/3-bit encoding.  */
 static void 
-nios2_assemble_arg_u (const char *token, nios2_insn_infoS *insn)
+nios2_assemble_arg_S (const char *token, nios2_insn_infoS *insn)
 {
   const struct nios2_opcode *op = insn->insn_nios2_opcode;
-  unsigned int val;
-
+  int reg = nios2_assemble_reg3 (token);
+  
   switch (op->format)
     {
-    case iw_i_type:
-      val = nios2_assemble_expression (token, insn,
-				       BFD_RELOC_NIOS2_U16, 0);
-      insn->constant_bits |= SET_IW_I_IMM16 (val);
+    case iw_T1I7_type:
+      insn->insn_code |= SET_IW_T1I7_A3 (reg);
+      break;
+    case iw_T2I4_type:
+      insn->insn_code |= SET_IW_T2I4_A3 (reg);
+      break;
+    case iw_T2X1L3_type:
+      insn->insn_code |= SET_IW_T2X1L3_A3 (reg);
+      break;
+    case iw_T2X1I3_type:
+      insn->insn_code |= SET_IW_T2X1I3_A3 (reg);
+      break;
+    case iw_T3X1_type:
+      insn->insn_code |= SET_IW_T3X1_A3 (reg);
+      break;
+    case iw_T2X3_type:
+      /* Some instructions using this encoding take 3 register arguments,
+	 requiring the destination register to be the same as the first
+	 source register.  */
+      if (op->num_args == 3)
+	{
+	  int dreg = GET_IW_T2X3_A3 (insn->insn_code);
+	  if (dreg != reg)
+	    as_bad ("source and destination registers must be the same");
+	}
+      else
+	insn->insn_code |= SET_IW_T2X3_A3 (reg);
+      break;
+    case iw_T1X1I6_type:
+      insn->insn_code |= SET_IW_T1X1I6_A3 (reg);
       break;
     default:
       bad_opcode (op);
     }
 }
 
+/* Source register 2 w/3-bit encoding.  */
 static void 
-nios2_assemble_arg_o (const char *token, nios2_insn_infoS *insn)
+nios2_assemble_arg_T (const char *token, nios2_insn_infoS *insn)
 {
   const struct nios2_opcode *op = insn->insn_nios2_opcode;
-  unsigned int val;
-
+  int reg = nios2_assemble_reg3 (token);
+  
   switch (op->format)
     {
-    case iw_i_type:
-      val = nios2_assemble_expression (token, insn,
-				       BFD_RELOC_16_PCREL, 1);
-      insn->constant_bits |= SET_IW_I_IMM16 (val);
+    case iw_T2I4_type:
+      insn->insn_code |= SET_IW_T2I4_B3 (reg);
+      break;
+    case iw_T3X1_type:
+      insn->insn_code |= SET_IW_T3X1_B3 (reg);
+      break;
+    case iw_T2X3_type:
+      insn->insn_code |= SET_IW_T2X3_B3 (reg);
       break;
     default:
       bad_opcode (op);
     }
 }
 
+/* 16-bit signed immediate.  */
 static void 
-nios2_assemble_arg_j (const char *token, nios2_insn_infoS *insn)
+nios2_assemble_arg_i (const char *token, nios2_insn_infoS *insn)
 {
   const struct nios2_opcode *op = insn->insn_nios2_opcode;
   unsigned int val;
 
   switch (op->format)
     {
-    case iw_r_type:
+    case iw_i_type:
       val = nios2_assemble_expression (token, insn,
-				       BFD_RELOC_NIOS2_IMM5, 0);
-      insn->constant_bits |= SET_IW_R_IMM5 (val);
+				       BFD_RELOC_NIOS2_S16, 0);
+      insn->constant_bits |= SET_IW_I_IMM16 (val);
+      break;
+    case iw_F2I16_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_S16, 0);
+      insn->constant_bits |= SET_IW_F2I16_IMM16 (val);
       break;
     default:
       bad_opcode (op);
     }
 }
 
+/* 12-bit signed immediate.  */
 static void 
-nios2_assemble_arg_l (const char *token, nios2_insn_infoS *insn)
+nios2_assemble_arg_I (const char *token, nios2_insn_infoS *insn)
 {
   const struct nios2_opcode *op = insn->insn_nios2_opcode;
   unsigned int val;
 
   switch (op->format)
     {
-    case iw_custom_type:
+    case iw_F2X4I12_type:
       val = nios2_assemble_expression (token, insn,
-				       BFD_RELOC_NIOS2_IMM8, 0);
-      insn->constant_bits |= SET_IW_CUSTOM_N (val);
+				       BFD_RELOC_NIOS2_R2_S12, 0);
+      insn->constant_bits |= SET_IW_F2X4I12_IMM12 (val);
+      break;
+    case iw_F1X4I12_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_R2_S12, 0);
+      insn->constant_bits |= SET_IW_F2X4I12_IMM12 (val);
       break;
     default:
       bad_opcode (op);
     }
 }
 
+/* 16-bit unsigned immediate.  */
 static void 
-nios2_assemble_arg_m (const char *token, nios2_insn_infoS *insn)
+nios2_assemble_arg_u (const char *token, nios2_insn_infoS *insn)
 {
   const struct nios2_opcode *op = insn->insn_nios2_opcode;
   unsigned int val;
 
   switch (op->format)
     {
-    case iw_j_type:
+    case iw_i_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_U16, 0);
+      insn->constant_bits |= SET_IW_I_IMM16 (val);
+      break;
+    case iw_F2I16_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_U16, 0);
+      insn->constant_bits |= SET_IW_F2I16_IMM16 (val);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* 7-bit unsigned immediate with 2-bit shift.  */
+static void 
+nios2_assemble_arg_U (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+
+  switch (op->format)
+    {
+    case iw_T1I7_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_R2_T1I7_2, 0);
+      insn->constant_bits |= SET_IW_T1I7_IMM7 (val >> 2);
+      break;
+    case iw_X1I7_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_R2_X1I7_2, 0);
+      insn->constant_bits |= SET_IW_X1I7_IMM7 (val >> 2);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* 5-bit unsigned immediate with 2-bit shift.  */
+static void 
+nios2_assemble_arg_V (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+
+  switch (op->format)
+    {
+    case iw_F1I5_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_R2_F1I5_2, 0);
+      insn->constant_bits |= SET_IW_F1I5_IMM5 (val >> 2);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* 4-bit unsigned immediate with 2-bit shift.  */
+static void 
+nios2_assemble_arg_W (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+
+  switch (op->format)
+    {
+    case iw_T2I4_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_R2_T2I4_2, 0);
+      insn->constant_bits |= SET_IW_T2I4_IMM4 (val >> 2);
+      break;
+    case iw_L5I4X1_type:
+      /* This argument is optional for push.n/pop.n, and defaults to 
+	 zero if unspecified.  */
+      if (token == NULL)
+	return;
+
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_R2_L5I4X1, 0);
+      insn->constant_bits |= SET_IW_L5I4X1_IMM4 (val >> 2);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* 4-bit unsigned immediate with 1-bit shift.  */
+static void 
+nios2_assemble_arg_X (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+
+  switch (op->format)
+    {
+    case iw_T2I4_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_R2_T2I4_1, 0);
+      insn->constant_bits |= SET_IW_T2I4_IMM4 (val >> 1);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* 4-bit unsigned immediate without shift.  */
+static void 
+nios2_assemble_arg_Y (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+
+  switch (op->format)
+    {
+    case iw_T2I4_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_R2_T2I4, 0);
+      insn->constant_bits |= SET_IW_T2I4_IMM4 (val);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+
+/* 16-bit signed immediate address offset.  */
+static void 
+nios2_assemble_arg_o (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+
+  switch (op->format)
+    {
+    case iw_i_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_16_PCREL, 1);
+      insn->constant_bits |= SET_IW_I_IMM16 (val);
+      break;
+    case iw_F2I16_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_16_PCREL, 1);
+      insn->constant_bits |= SET_IW_F2I16_IMM16 (val);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* 10-bit signed address offset with 1-bit shift.  */
+static void 
+nios2_assemble_arg_O (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+
+  switch (op->format)
+    {
+    case iw_I10_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_R2_I10_1_PCREL, 1);
+      insn->constant_bits |= SET_IW_I10_IMM10 (val >> 1);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* 7-bit signed address offset with 1-bit shift.  */
+static void 
+nios2_assemble_arg_P (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+
+  switch (op->format)
+    {
+    case iw_T1I7_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_R2_T1I7_1_PCREL, 1);
+      insn->constant_bits |= SET_IW_T1I7_IMM7 (val >> 1);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* 5-bit unsigned immediate.  */
+static void 
+nios2_assemble_arg_j (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+
+  switch (op->format)
+    {
+    case iw_r_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_IMM5, 0);
+      insn->constant_bits |= SET_IW_R_IMM5 (val);
+      break;
+    case iw_F3X6L5_type:
+      if (op->match == MATCH_R2_ENI)
+	/* Value must be constant 0 or 1.  */
+	{
+	  val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0);
+	  if (val != 0 && val != 1)
+	    as_bad ("invalid eni argument %u", val);
+	  insn->insn_code |= SET_IW_F3X6L5_IMM5 (val);
+	}
+      else
+	{
+	  val = nios2_assemble_expression (token, insn,
+					   BFD_RELOC_NIOS2_IMM5, 0);
+	  insn->constant_bits |= SET_IW_F3X6L5_IMM5 (val);
+	}
+      break;
+    case iw_F2X6L10_type:
+      /* Only constant expression without relocation permitted for
+	 bit position.  */
+      val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0);
+      if (val > 31)
+	as_bad ("invalid bit position %u", val);
+      insn->insn_code |= SET_IW_F2X6L10_MSB (val);
+      break;
+    case iw_X2L5_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_R2_X2L5, 0);
+      insn->constant_bits |= SET_IW_X2L5_IMM5 (val);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* Second 5-bit unsigned immediate field.  */
+static void 
+nios2_assemble_arg_k (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+
+  switch (op->format)
+    {
+    case iw_F2X6L10_type:
+      /* Only constant expression without relocation permitted for
+	 bit position.  */
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NONE, 0);
+      if (val > 31)
+	as_bad ("invalid bit position %u", val);
+      else if (GET_IW_F2X6L10_MSB (insn->insn_code) < val)
+	as_bad ("MSB must be greater than or equal to LSB");
+      insn->insn_code |= SET_IW_F2X6L10_LSB (val);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* 8-bit unsigned immediate.  */
+static void 
+nios2_assemble_arg_l (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+
+  switch (op->format)
+    {
+    case iw_custom_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_IMM8, 0);
+      insn->constant_bits |= SET_IW_CUSTOM_N (val);
+      break;
+    case iw_F3X8_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_IMM8, 0);
+      insn->constant_bits |= SET_IW_F3X8_N (val);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* 26-bit unsigned immediate.  */
+static void 
+nios2_assemble_arg_m (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+
+  switch (op->format)
+    {
+    case iw_j_type:
       val = nios2_assemble_expression (token, insn,
 				       (nios2_as_options.noat
 					? BFD_RELOC_NIOS2_CALL26_NOAT
@@ -1676,6 +2523,277 @@ nios2_assemble_arg_m (const char *token, nios2_insn_infoS *insn)
 				       0);
       insn->constant_bits |= SET_IW_J_IMM26 (val);
       break;
+    case iw_L26_type:
+      val = nios2_assemble_expression (token, insn,
+				       (nios2_as_options.noat
+					? BFD_RELOC_NIOS2_CALL26_NOAT
+					: BFD_RELOC_NIOS2_CALL26),
+				       0);
+      insn->constant_bits |= SET_IW_L26_IMM26 (val);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* 6-bit unsigned immediate with no shifting.  */
+static void 
+nios2_assemble_arg_M (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+
+  switch (op->format)
+    {
+    case iw_T1X1I6_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_R2_T1X1I6, 0);
+      insn->constant_bits |= SET_IW_T1X1I6_IMM6 (val);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* 6-bit unsigned immediate with 2-bit shift.  */
+static void 
+nios2_assemble_arg_N (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+
+  switch (op->format)
+    {
+    case iw_T1X1I6_type:
+      val = nios2_assemble_expression (token, insn,
+				       BFD_RELOC_NIOS2_R2_T1X1I6_2, 0);
+      insn->constant_bits |= SET_IW_T1X1I6_IMM6 (val >> 2);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+
+/* Encoded enumeration for addi.n/subi.n.  */
+static void 
+nios2_assemble_arg_e (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+  int i;
+
+  switch (op->format)
+    {
+    case iw_T2X1I3_type:
+      val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0);
+      for (i = 0; i < nios2_num_r2_asi_n_mappings; i++)
+	if (val == nios2_r2_asi_n_mappings[i])
+	  break;
+      if (i == nios2_num_r2_asi_n_mappings)
+	{
+	  as_bad (_("Invalid constant operand %s"), token);
+	  return;
+	}
+      insn->insn_code |= SET_IW_T2X1I3_IMM3 ((unsigned)i);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* Encoded enumeration for slli.n/srli.n.  */
+static void 
+nios2_assemble_arg_f (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+  int i;
+
+  switch (op->format)
+    {
+    case iw_T2X1L3_type:
+      val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0);
+      for (i = 0; i < nios2_num_r2_shi_n_mappings; i++)
+	if (val == nios2_r2_shi_n_mappings[i])
+	  break;
+      if (i == nios2_num_r2_shi_n_mappings)
+	{
+	  as_bad (_("Invalid constant operand %s"), token);
+	  return;
+	}
+      insn->insn_code |= SET_IW_T2X1L3_SHAMT ((unsigned)i);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* Encoded enumeration for andi.n.  */
+static void 
+nios2_assemble_arg_g (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+  int i;
+
+  switch (op->format)
+    {
+    case iw_T2I4_type:
+      val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0);
+      for (i = 0; i < nios2_num_r2_andi_n_mappings; i++)
+	if (val == nios2_r2_andi_n_mappings[i])
+	  break;
+      if (i == nios2_num_r2_andi_n_mappings)
+	{
+	  as_bad (_("Invalid constant operand %s"), token);
+	  return;
+	}
+      insn->insn_code |= SET_IW_T2I4_IMM4 ((unsigned)i);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* Encoded enumeration for movi.n.  */
+static void 
+nios2_assemble_arg_h (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned int val;
+  int i;
+
+  switch (op->format)
+    {
+    case iw_T1I7_type:
+      val = nios2_assemble_expression (token, insn, BFD_RELOC_NONE, 0);
+      i = (signed) val;
+      if ((signed) i == -1)
+	val = 127;
+      else if (i == -2)
+	val = 126;
+      else if (i == 0xff)
+	val = 125;
+      else if (i < 0 || i > 125)
+	{
+	  as_bad (_("Invalid constant operand %s"), token);
+	  return;
+	}
+      insn->insn_code |= SET_IW_T1I7_IMM7 (val);
+      break;
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* Encoded REGMASK for ldwm/stwm or push.n/pop.n.  */
+static void 
+nios2_assemble_arg_R (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  unsigned long mask;
+  char *buf = strdup (token);
+  unsigned long reglist = nios2_parse_reglist (buf, op);
+  free (buf);
+
+  if (reglist == 0)
+    return;
+
+  switch (op->format)
+    {
+    case iw_F1X4L17_type:
+      /* Encoding for ldwm/stwm.  */
+      if (reglist & 0x00003ffc)
+	mask = reglist >> 2;
+      else
+	{
+	  insn->insn_code |= SET_IW_F1X4L17_RS (1);
+	  mask = (reglist & 0x00ffc000) >> 14;
+	  if (reglist & (1 << 28))
+	    mask |= 1 << 10;
+	  if (reglist & (1 << 31))
+	    mask |= 1 << 11;
+	}
+      insn->insn_code |= SET_IW_F1X4L17_REGMASK (mask);
+      break;
+
+    case iw_L5I4X1_type:
+      /* Encoding for push.n/pop.n.  */
+      if (reglist & (1 << 28))
+	insn->insn_code |= SET_IW_L5I4X1_FP (1);
+      mask = reglist & 0x00ff0000;
+      if (mask)
+	{
+	  int i;
+
+	  for (i = 0; i < nios2_num_r2_reg_range_mappings; i++)
+	    if (nios2_r2_reg_range_mappings[i] == mask)
+	      break;
+	  if (i == nios2_num_r2_reg_range_mappings)
+	    {
+	      as_bad ("invalid reglist");
+	      return;
+	    }
+	  insn->insn_code |= SET_IW_L5I4X1_REGRANGE (i);
+	  insn->insn_code |= SET_IW_L5I4X1_CS (1);
+	}
+      break;
+	
+    default:
+      bad_opcode (op);
+    }
+}
+
+/* Base register for ldwm/stwm.  */
+static void 
+nios2_assemble_arg_B (const char *token, nios2_insn_infoS *insn)
+{
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
+  int direction, writeback, ret;
+  char *str = strdup (token);
+  struct nios2_reg *reg
+    = nios2_parse_base_register (str, &direction, &writeback, &ret);
+
+  free (str);
+  if (!reg)
+    return;
+
+  switch (op->format)
+    {
+    case iw_F1X4L17_type:
+      /* For ldwm, check to see if the base register is already inside the 
+	 register list.  */
+      if (op->match == MATCH_R2_LDWM
+	  && (nios2_reglist_mask & (1 << reg->index)))
+	{
+	  as_bad ("invalid base register; %s is inside the reglist", reg->name);
+	  return;
+	}
+
+      /* For stwm, ret option is not allowed.  */
+      if (op->match == MATCH_R2_STWM && ret)
+	{
+	  as_bad ("invalid option syntax");
+	  return;
+	}
+
+      /* Check that the direction matches the ordering of the reglist.  */
+      if (nios2_reglist_dir && direction != nios2_reglist_dir)
+	{
+	  as_bad ("reglist order does not match increment/decrement mode");
+	  return;
+	}
+
+      insn->insn_code |= SET_IW_F1X4L17_A (reg->index);
+      if (direction > 0)
+	insn->insn_code |= SET_IW_F1X4L17_ID (1);
+      if (writeback)
+	insn->insn_code |= SET_IW_F1X4L17_WB (1);
+      if (ret)
+	insn->insn_code |= SET_IW_F1X4L17_PC (1);
+      break;
+
     default:
       bad_opcode (op);
     }
@@ -1723,22 +2841,70 @@ nios2_assemble_args (nios2_insn_infoS *insn)
 	nios2_assemble_arg_t (insn->insn_tokens[tokidx++], insn);
 	break;
 	
+      case 'D':
+	nios2_assemble_arg_D (insn->insn_tokens[tokidx++], insn);
+	break;
+	
+      case 'S':
+	nios2_assemble_arg_S (insn->insn_tokens[tokidx++], insn);
+	break;
+	
+      case 'T':
+	nios2_assemble_arg_T (insn->insn_tokens[tokidx++], insn);
+	break;
+	
       case 'i':
 	nios2_assemble_arg_i (insn->insn_tokens[tokidx++], insn);
 	break;
 	
+      case 'I':
+	nios2_assemble_arg_I (insn->insn_tokens[tokidx++], insn);
+	break;
+	
       case 'u':
 	nios2_assemble_arg_u (insn->insn_tokens[tokidx++], insn);
 	break;
 	
+      case 'U':
+	nios2_assemble_arg_U (insn->insn_tokens[tokidx++], insn);
+	break;
+	
+      case 'V':
+	nios2_assemble_arg_V (insn->insn_tokens[tokidx++], insn);
+	break;
+	
+      case 'W':
+	nios2_assemble_arg_W (insn->insn_tokens[tokidx++], insn);
+	break;
+	
+      case 'X':
+	nios2_assemble_arg_X (insn->insn_tokens[tokidx++], insn);
+	break;
+	
+      case 'Y':
+	nios2_assemble_arg_Y (insn->insn_tokens[tokidx++], insn);
+	break;
+	
       case 'o':
 	nios2_assemble_arg_o (insn->insn_tokens[tokidx++], insn);
 	break;
 	
+      case 'O':
+	nios2_assemble_arg_O (insn->insn_tokens[tokidx++], insn);
+	break;
+	
+      case 'P':
+	nios2_assemble_arg_P (insn->insn_tokens[tokidx++], insn);
+	break;
+
       case 'j':
 	nios2_assemble_arg_j (insn->insn_tokens[tokidx++], insn);
 	break;
 	
+      case 'k':
+	nios2_assemble_arg_k (insn->insn_tokens[tokidx++], insn);
+	break;
+	
       case 'l':
 	nios2_assemble_arg_l (insn->insn_tokens[tokidx++], insn);
 	break;
@@ -1746,7 +2912,39 @@ nios2_assemble_args (nios2_insn_infoS *insn)
       case 'm':
 	nios2_assemble_arg_m (insn->insn_tokens[tokidx++], insn);
 	break;
+
+      case 'M':
+	nios2_assemble_arg_M (insn->insn_tokens[tokidx++], insn);
+	break;
+
+      case 'N':
+	nios2_assemble_arg_N (insn->insn_tokens[tokidx++], insn);
+	break;
+
+      case 'e':
+	nios2_assemble_arg_e (insn->insn_tokens[tokidx++], insn);
+	break;
+	
+      case 'f':
+	nios2_assemble_arg_f (insn->insn_tokens[tokidx++], insn);
+	break;
+	
+      case 'g':
+	nios2_assemble_arg_g (insn->insn_tokens[tokidx++], insn);
+	break;
+	
+      case 'h':
+	nios2_assemble_arg_h (insn->insn_tokens[tokidx++], insn);
+	break;
 	
+      case 'R':
+	nios2_assemble_arg_R (insn->insn_tokens[tokidx++], insn);
+	break;
+
+      case 'B':
+	nios2_assemble_arg_B (insn->insn_tokens[tokidx++], insn);
+	break;
+
       default:
 	bad_opcode (op);
 	break;
@@ -1775,6 +2973,9 @@ nios2_consume_arg (char *argstr, const char *parsestr)
     case 'd':
     case 's':
     case 't':
+    case 'D':
+    case 'S':
+    case 'T':
       break;
 
     case 'i':
@@ -1798,11 +2999,60 @@ nios2_consume_arg (char *argstr, const char *parsestr)
       break;
     case 'm':
     case 'j':
+    case 'k':
     case 'l':
+    case 'I':
+    case 'U':
+    case 'V':
+    case 'W':
+    case 'X':
+    case 'Y':
+    case 'O':
+    case 'P':
+    case 'e':
+    case 'f':
+    case 'g':
+    case 'h':
+    case 'M':
+    case 'N':
+      
       /* We can't have %hi, %lo or %hiadj here.  */
       if (*argstr == '%')
 	as_bad (_("badly formed expression near %s"), argstr);
       break;
+
+    case 'R':
+      /* Register list for ldwm/stwm or push.n/pop.n.  Replace the commas
+	 in the list with spaces so we don't confuse them with separators.  */
+      if (*argstr != '{')
+	{
+	  as_bad ("missing '{' in register list");
+	  break;
+	}
+      for (temp = argstr + 1; *temp; temp++)
+	{
+	  if (*temp == '}')
+	    break;
+	  else if (*temp == ',')
+	    *temp = ' ';
+	}
+      if (!*temp)
+	{
+	  as_bad ("missing '}' in register list");
+	  break;
+	}
+      break;
+
+    case 'B':
+      /* Base register and options for ldwm/stwm.  This is the final argument
+	 and consumes the rest of the argument string; replace commas
+	 with spaces so that the token splitter doesn't think they are
+	 separate arguments.  */
+      for (temp = argstr; *temp; temp++)
+	if (*temp == ',')
+	  *temp = ' ';
+      break;
+
     case 'o':
     case 'E':
       break;
@@ -1839,7 +3089,6 @@ nios2_consume_separator (char *argstr, const char *separator)
   return p;
 }
 
-
 /* The principal argument parsing function which takes a string argstr
    representing the instruction arguments for insn, and extracts the argument
    tokens matching parsestr into parsed_args.  */
@@ -2022,7 +3271,7 @@ nios2_translate_pseudo_insn (nios2_insn_infoS *insn)
   else
     /* we cannot recover from this.  */
     as_fatal (_("unrecognized pseudo-instruction %s"),
-	      ps_insn->pseudo_insn);
+	      insn->insn_nios2_opcode->name);
   return ps_insn;
 }
 
@@ -2056,7 +3305,8 @@ const nios2_ps_insn_infoS nios2_ps_insn_info_structs[] = {
   {"cmpgtui", "cmpgeui", nios2_modify_arg, "+1", 0, 3, nios2_free_arg},
   {"cmplei", "cmplti", nios2_modify_arg, "+1", 0, 3, nios2_free_arg},
   {"cmpleui", "cmpltui", nios2_modify_arg, "+1", 0, 3, nios2_free_arg},
-  {"subi", "addi", nios2_negate_arg, "", 0, 3, nios2_free_arg}
+  {"subi", "addi", nios2_negate_arg, "", 0, 3, nios2_free_arg},
+  {"nop.n", "mov.n", nios2_append_arg, "zero", 2, 1, NULL}
   /* Add further pseudo-ops here.  */
 };
 
@@ -2101,6 +3351,7 @@ output_ubranch (nios2_insn_infoS *insn)
       symbolS *symp = reloc->reloc_expression.X_add_symbol;
       offsetT offset = reloc->reloc_expression.X_add_number;
       char *f;
+      bfd_boolean is_cdx = (insn->insn_nios2_opcode->size == 2);
 
       /* Tag dwarf2 debug info to the address at the start of the insn.
 	 We must do it before frag_var() below closes off the frag.  */
@@ -2111,7 +3362,8 @@ output_ubranch (nios2_insn_infoS *insn)
 	 this may generate.  */
       f = frag_var (rs_machine_dependent,
 		    UBRANCH_MAX_SIZE, insn->insn_nios2_opcode->size,
-		    UBRANCH_SUBTYPE (0), symp, offset, NULL);
+		    (is_cdx ? CDX_UBRANCH_SUBTYPE (0) : UBRANCH_SUBTYPE (0)),
+		    symp, offset, NULL);
 
       md_number_to_chars (f, insn->insn_code, insn->insn_nios2_opcode->size);
 
@@ -2131,6 +3383,7 @@ output_cbranch (nios2_insn_infoS *insn)
       symbolS *symp = reloc->reloc_expression.X_add_symbol;
       offsetT offset = reloc->reloc_expression.X_add_number;
       char *f;
+      bfd_boolean is_cdx = (insn->insn_nios2_opcode->size == 2);
 
       /* Tag dwarf2 debug info to the address at the start of the insn.
 	 We must do it before frag_var() below closes off the frag.  */
@@ -2141,7 +3394,8 @@ output_cbranch (nios2_insn_infoS *insn)
 	 this may generate.  */
       f = frag_var (rs_machine_dependent,
 		    CBRANCH_MAX_SIZE, insn->insn_nios2_opcode->size,
-		    CBRANCH_SUBTYPE (0), symp, offset, NULL);
+		    (is_cdx ? CDX_CBRANCH_SUBTYPE (0) : CBRANCH_SUBTYPE (0)),
+		    symp, offset, NULL);
 
       md_number_to_chars (f, insn->insn_code, insn->insn_nios2_opcode->size);
 
@@ -2162,23 +3416,50 @@ output_call (nios2_insn_infoS *insn)
      and puts it in the current frag.  */
   char *f = frag_more (12);
   nios2_insn_relocS *reloc = insn->insn_reloc;
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
 
-  md_number_to_chars (f,
-		      (MATCH_R1_ORHI | SET_IW_I_B (AT_REGNUM)
-		       | SET_IW_I_A (0)),
-		      4);
-  dwarf2_emit_insn (4);
-  fix_new_exp (frag_now, f - frag_now->fr_literal, 4,
-	       &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_HI16);
-  md_number_to_chars (f + 4,
-		      (MATCH_R1_ORI | SET_IW_I_B (AT_REGNUM)
-		       | SET_IW_I_A (AT_REGNUM)),
-		      4);
-  dwarf2_emit_insn (4);
-  fix_new_exp (frag_now, f - frag_now->fr_literal + 4, 4,
-	       &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_LO16);
-  md_number_to_chars (f + 8, MATCH_R1_CALLR | SET_IW_R_A (AT_REGNUM), 4);
-  dwarf2_emit_insn (4);
+  switch (op->format)
+    {
+    case iw_j_type:
+      md_number_to_chars (f,
+			  (MATCH_R1_ORHI | SET_IW_I_B (AT_REGNUM)
+			   | SET_IW_I_A (0)),
+			  4);
+      dwarf2_emit_insn (4);
+      fix_new_exp (frag_now, f - frag_now->fr_literal, 4,
+		   &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_HI16);
+      md_number_to_chars (f + 4,
+			  (MATCH_R1_ORI | SET_IW_I_B (AT_REGNUM)
+			   | SET_IW_I_A (AT_REGNUM)),
+			  4);
+      dwarf2_emit_insn (4);
+      fix_new_exp (frag_now, f - frag_now->fr_literal + 4, 4,
+		   &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_LO16);
+      md_number_to_chars (f + 8, MATCH_R1_CALLR | SET_IW_R_A (AT_REGNUM), 4);
+      dwarf2_emit_insn (4);
+      break;
+    case iw_L26_type:
+      md_number_to_chars (f,
+			  (MATCH_R2_ORHI | SET_IW_F2I16_B (AT_REGNUM)
+			   | SET_IW_F2I16_A (0)),
+			  4);
+      dwarf2_emit_insn (4);
+      fix_new_exp (frag_now, f - frag_now->fr_literal, 4,
+		   &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_HI16);
+      md_number_to_chars (f + 4,
+			  (MATCH_R2_ORI | SET_IW_F2I16_B (AT_REGNUM)
+			   | SET_IW_F2I16_A (AT_REGNUM)),
+			  4);
+      dwarf2_emit_insn (4);
+      fix_new_exp (frag_now, f - frag_now->fr_literal + 4, 4,
+		   &reloc->reloc_expression, 0, BFD_RELOC_NIOS2_LO16);
+      md_number_to_chars (f + 8, MATCH_R2_CALLR | SET_IW_F3X6L5_A (AT_REGNUM),
+			  4);
+      dwarf2_emit_insn (4);
+      break;
+    default:
+      bad_opcode (op);
+    }
 }
 
 /* Output a movhi/addi pair for the movia pseudo-op.  */
@@ -2189,21 +3470,33 @@ output_movia (nios2_insn_infoS *insn)
      and puts it in the current frag.  */
   char *f = frag_more (8);
   nios2_insn_relocS *reloc = insn->insn_reloc;
-  unsigned long reg_index = GET_IW_I_B (insn->insn_code);
+  unsigned long reg, code;
+  const struct nios2_opcode *op = insn->insn_nios2_opcode;
 
   /* If the reloc is NULL, there was an error assembling the movia.  */
   if (reloc != NULL)
     {
+      switch (op->format)
+	{
+	case iw_i_type:
+	  reg = GET_IW_I_B (insn->insn_code);
+	  code = MATCH_R1_ADDI | SET_IW_I_A (reg) | SET_IW_I_B (reg);
+	  break;
+	case iw_F2I16_type:
+	  reg = GET_IW_F2I16_B (insn->insn_code);
+	  code = MATCH_R2_ADDI | SET_IW_F2I16_A (reg) | SET_IW_F2I16_B (reg);
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+
       md_number_to_chars (f, insn->insn_code, 4);
       dwarf2_emit_insn (4);
       fix_new (frag_now, f - frag_now->fr_literal, 4,
 	       reloc->reloc_expression.X_add_symbol,
 	       reloc->reloc_expression.X_add_number, 0,
 	       BFD_RELOC_NIOS2_HIADJ16);
-      md_number_to_chars (f + 4,
-			  (MATCH_R1_ADDI | SET_IW_I_A (reg_index)
-			   | SET_IW_I_B (reg_index)),
-			  4);
+      md_number_to_chars (f + 4, code, 4);
       dwarf2_emit_insn (4);
       fix_new (frag_now, f + 4 - frag_now->fr_literal, 4,
 	       reloc->reloc_expression.X_add_symbol,
@@ -2387,6 +3680,7 @@ md_begin (void)
   nios2_current_align_seg = now_seg;
   nios2_last_label = NULL;
   nios2_current_align = 0;
+  nios2_min_align = 2;
 }
 
 
@@ -2400,11 +3694,11 @@ md_assemble (char *op_str)
   nios2_insn_infoS thisinsn;
   nios2_insn_infoS *insn = &thisinsn;
 
-  /* Make sure we are aligned on a 4-byte boundary.  */
-  if (nios2_current_align < 2)
-    nios2_align (2, NULL, nios2_last_label);
-  else if (nios2_current_align > 2)
-    nios2_current_align = 2;
+  /* Make sure we are aligned on an appropriate boundary.  */
+  if (nios2_current_align < nios2_min_align)
+    nios2_align (nios2_min_align, NULL, nios2_last_label);
+  else if (nios2_current_align > nios2_min_align)
+    nios2_current_align = nios2_min_align;
   nios2_last_label = NULL;
 
   /* We don't want to clobber to op_str
@@ -2420,6 +3714,11 @@ md_assemble (char *op_str)
   if (insn->insn_nios2_opcode != NULL)
     {
       nios2_ps_insn_infoS *ps_insn = NULL;
+
+      /* Note if we've seen a 16-bit instruction.  */
+      if (insn->insn_nios2_opcode->size == 2)
+	nios2_min_align = 1;
+
       /* Set the opcode for the instruction.  */
       insn->insn_code = insn->insn_nios2_opcode->match;
       insn->constant_bits = 0;
@@ -2667,7 +3966,7 @@ nios2_cons_align (int size)
     ++log_size;
 
   if (subseg_text_p (now_seg))
-    pfill = (const char *) &nop;
+    pfill = (const char *) nop32;
   else
     pfill = NULL;
 
diff --git a/include/opcode/ChangeLog b/include/opcode/ChangeLog
index f1b3f1fa264..def21317806 100644
--- a/include/opcode/ChangeLog
+++ b/include/opcode/ChangeLog
@@ -1,3 +1,21 @@
+2015-07-01  Sandra Loosemore  <sandra@codesourcery.com>
+	    Cesar Philippidis  <cesar@codesourcery.com>
+
+	* nios2.h (enum iw_format_type): Add R2 formats.
+	(enum overflow_type): Add signed_immed12_overflow and
+	enumeration_overflow for R2.
+	(struct nios2_opcode): Document new argument letters for R2.
+	(REG_3BIT, REG_LDWM, REG_POP): Define.
+	(includes): Include nios2r2.h.
+	(nios2_r2_opcodes, nios2_num_r2_opcodes): Declare.
+	(nios2_r2_asi_n_mappings, nios2_num_r2_asi_n_mappings): Declare.
+	(nios2_r2_shi_n_mappings, nios2_num_r2_shi_n_mappings): Declare.
+	(nios2_r2_andi_n_mappings, nios2_num_r2_andi_n_mappings): Declare.
+	(nios2_r2_reg3_mappings, nios2_num_r2_reg3_mappings): Declare.
+	(nios2_r2_reg_range_mappings, nios2_num_r2_reg_range_mappings):
+	Declare.
+	* nios2r2.h: New file.
+
 2015-06-19  Peter Bergner <bergner@vnet.ibm.com>
 
 	* ppc.h (PPC_OPERAND_OPTIONAL_VALUE): New.
diff --git a/include/opcode/nios2.h b/include/opcode/nios2.h
index cbd2b8ccb48..7dab06fd35a 100644
--- a/include/opcode/nios2.h
+++ b/include/opcode/nios2.h
@@ -37,11 +37,38 @@ extern "C" {
 
 /* Instruction encoding formats.  */
 enum iw_format_type {
-  /* R1 formats */
+  /* R1 formats.  */
   iw_i_type,
   iw_r_type,
   iw_j_type,
-  iw_custom_type
+  iw_custom_type,
+
+  /* 32-bit R2 formats.  */
+  iw_L26_type,
+  iw_F2I16_type,
+  iw_F2X4I12_type,
+  iw_F1X4I12_type,
+  iw_F1X4L17_type,
+  iw_F3X6L5_type,
+  iw_F2X6L10_type,
+  iw_F3X6_type,
+  iw_F3X8_type,
+
+  /* 16-bit R2 formats.  */
+  iw_I10_type,
+  iw_T1I7_type,
+  iw_T2I4_type,
+  iw_T1X1I6_type,
+  iw_X1I7_type,
+  iw_L5I4X1_type,
+  iw_T2X1L3_type,
+  iw_T2X1I3_type,
+  iw_T3X1_type,
+  iw_T2X3_type,
+  iw_F1X1_type,
+  iw_X2L5_type,
+  iw_F1I5_type,
+  iw_F2_type
 };
 
 /* Identify different overflow situations for error messages.  */
@@ -53,7 +80,9 @@ enum overflow_type
   signed_immed16_overflow,
   unsigned_immed16_overflow,
   unsigned_immed5_overflow,
+  signed_immed12_overflow,
   custom_opcode_overflow,
+  enumeration_overflow,
   no_overflow
 };
 
@@ -65,12 +94,32 @@ enum overflow_type
      d - a 5-bit destination register index
      s - a 5-bit left source register index
      t - a 5-bit right source register index
+     D - a 3-bit encoded destination register
+     S - a 3-bit encoded left source register
+     T - a 3-bit encoded right source register
      i - a 16-bit signed immediate
-     u - a 16-bit unsigned immediate
-     o - a 16-bit signed program counter relative offset
      j - a 5-bit unsigned immediate
+     k - a (second) 5-bit unsigned immediate
      l - a 8-bit custom instruction constant
      m - a 26-bit unsigned immediate
+     o - a 16-bit signed pc-relative offset
+     u - a 16-bit unsigned immediate
+     I - a 12-bit signed immediate
+     M - a 6-bit unsigned immediate
+     N - a 6-bit unsigned immediate with 2-bit shift
+     O - a 10-bit signed pc-relative offset with 1-bit shift
+     P - a 7-bit signed pc-relative offset with 1-bit shift
+     U - a 7-bit unsigned immediate with 2-bit shift
+     V - a 5-bit unsigned immediate with 2-bit shift
+     W - a 4-bit unsigned immediate with 2-bit shift
+     X - a 4-bit unsigned immediate with 1-bit shift
+     Y - a 4-bit unsigned immediate
+     e - an immediate coded as an enumeration for addi.n/subi.n
+     f - an immediate coded as an enumeration for slli.n/srli.n
+     g - an immediate coded as an enumeration for andi.n
+     h - an immediate coded as an enumeration for movi.n
+     R - a reglist for ldwm/stwm or push.n/pop.n
+     B - a base register specifier and option list for ldwm/stwm
    Literal ',', '(', and ')' characters may also appear in the args as
    delimiters.
 
@@ -130,6 +179,9 @@ struct nios2_opcode
 #define REG_NORMAL	(1<<0)	/* Normal registers.  */
 #define REG_CONTROL	(1<<1)  /* Control registers.  */
 #define REG_COPROCESSOR	(1<<2)  /* For custom instructions.  */
+#define REG_3BIT	(1<<3)  /* For R2 CDX instructions.  */
+#define REG_LDWM	(1<<4)  /* For R2 ldwm/stwm.  */
+#define REG_POP		(1<<5)  /* For R2 pop.n/push.n.  */
 
 struct nios2_reg
 {
@@ -140,10 +192,13 @@ struct nios2_reg
 
 /* Pull in the instruction field accessors, opcodes, and masks.  */
 #include "nios2r1.h"
+#include "nios2r2.h"
 
 /* These are the data structures used to hold the instruction information.  */
 extern const struct nios2_opcode nios2_r1_opcodes[];
 extern const int nios2_num_r1_opcodes;
+extern const struct nios2_opcode nios2_r2_opcodes[];
+extern const int nios2_num_r2_opcodes;
 extern struct nios2_opcode *nios2_opcodes;
 extern int nios2_num_opcodes;
 
@@ -157,6 +212,22 @@ extern int nios2_num_regs;
 extern const struct nios2_opcode *
 nios2_find_opcode_hash (unsigned long, unsigned long);
 
+/* Lookup tables for R2 immediate decodings.  */
+extern unsigned int nios2_r2_asi_n_mappings[];
+extern const int nios2_num_r2_asi_n_mappings;
+extern unsigned int nios2_r2_shi_n_mappings[];
+extern const int nios2_num_r2_shi_n_mappings;
+extern unsigned int nios2_r2_andi_n_mappings[];
+extern const int nios2_num_r2_andi_n_mappings;
+
+/* Lookup table for 3-bit register decodings.  */
+extern int nios2_r2_reg3_mappings[];
+extern const int nios2_num_r2_reg3_mappings;
+
+/* Lookup table for REG_RANGE value list decodings.  */
+extern unsigned long nios2_r2_reg_range_mappings[];
+extern const int nios2_num_r2_reg_range_mappings;
+
 #ifdef __cplusplus
 }
 #endif
diff --git a/include/opcode/nios2r2.h b/include/opcode/nios2r2.h
new file mode 100644
index 00000000000..fd50aa04d0d
--- /dev/null
+++ b/include/opcode/nios2r2.h
@@ -0,0 +1,1081 @@
+/* Nios II R2 opcode list for GAS, the GNU assembler.
+   Copyright (C) 2013-2015 Free Software Foundation, Inc.
+   Contributed by Mentor Graphics, Inc.
+
+   This file is part of GAS, the GNU Assembler, and GDB, the GNU disassembler.
+
+   GAS/GDB is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   GAS/GDB is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GAS or GDB; see the file COPYING3.  If not, write to
+   the Free Software Foundation, 51 Franklin Street - Fifth Floor,
+   Boston, MA 02110-1301, USA.  */
+
+#ifndef _NIOS2R2_H_
+#define _NIOS2R2_H_
+
+/* Fields for 32-bit R2 instructions.  */
+
+#define IW_R2_OP_LSB 0
+#define IW_R2_OP_SIZE 6
+#define IW_R2_OP_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_R2_OP_SIZE))
+#define IW_R2_OP_SHIFTED_MASK (IW_R2_OP_UNSHIFTED_MASK << IW_R2_OP_LSB)
+#define GET_IW_R2_OP(W) (((W) >> IW_R2_OP_LSB) & IW_R2_OP_UNSHIFTED_MASK)
+#define SET_IW_R2_OP(V) (((V) & IW_R2_OP_UNSHIFTED_MASK) << IW_R2_OP_LSB)
+
+#define IW_L26_IMM26_LSB 6
+#define IW_L26_IMM26_SIZE 26
+#define IW_L26_IMM26_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_L26_IMM26_SIZE))
+#define IW_L26_IMM26_SHIFTED_MASK (IW_L26_IMM26_UNSHIFTED_MASK << IW_L26_IMM26_LSB)
+#define GET_IW_L26_IMM26(W) (((W) >> IW_L26_IMM26_LSB) & IW_L26_IMM26_UNSHIFTED_MASK)
+#define SET_IW_L26_IMM26(V) (((V) & IW_L26_IMM26_UNSHIFTED_MASK) << IW_L26_IMM26_LSB)
+
+#define IW_F2I16_A_LSB 6
+#define IW_F2I16_A_SIZE 5
+#define IW_F2I16_A_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F2I16_A_SIZE))
+#define IW_F2I16_A_SHIFTED_MASK (IW_F2I16_A_UNSHIFTED_MASK << IW_F2I16_A_LSB)
+#define GET_IW_F2I16_A(W) (((W) >> IW_F2I16_A_LSB) & IW_F2I16_A_UNSHIFTED_MASK)
+#define SET_IW_F2I16_A(V) (((V) & IW_F2I16_A_UNSHIFTED_MASK) << IW_F2I16_A_LSB)
+
+#define IW_F2I16_B_LSB 11
+#define IW_F2I16_B_SIZE 5
+#define IW_F2I16_B_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F2I16_B_SIZE))
+#define IW_F2I16_B_SHIFTED_MASK (IW_F2I16_B_UNSHIFTED_MASK << IW_F2I16_B_LSB)
+#define GET_IW_F2I16_B(W) (((W) >> IW_F2I16_B_LSB) & IW_F2I16_B_UNSHIFTED_MASK)
+#define SET_IW_F2I16_B(V) (((V) & IW_F2I16_B_UNSHIFTED_MASK) << IW_F2I16_B_LSB)
+
+#define IW_F2I16_IMM16_LSB 16
+#define IW_F2I16_IMM16_SIZE 16
+#define IW_F2I16_IMM16_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F2I16_IMM16_SIZE))
+#define IW_F2I16_IMM16_SHIFTED_MASK (IW_F2I16_IMM16_UNSHIFTED_MASK << IW_F2I16_IMM16_LSB)
+#define GET_IW_F2I16_IMM16(W) (((W) >> IW_F2I16_IMM16_LSB) & IW_F2I16_IMM16_UNSHIFTED_MASK)
+#define SET_IW_F2I16_IMM16(V) (((V) & IW_F2I16_IMM16_UNSHIFTED_MASK) << IW_F2I16_IMM16_LSB)
+
+/* Common to all three I12-group formats F2X4I12, F1X4I12, F1X4L17.  */
+#define IW_I12_X_LSB 28
+#define IW_I12_X_SIZE 4
+#define IW_I12_X_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_I12_X_SIZE))
+#define IW_I12_X_SHIFTED_MASK (IW_I12_X_UNSHIFTED_MASK << IW_I12_X_LSB)
+#define GET_IW_I12_X(W) (((W) >> IW_I12_X_LSB) & IW_I12_X_UNSHIFTED_MASK)
+#define SET_IW_I12_X(V) (((V) & IW_I12_X_UNSHIFTED_MASK) << IW_I12_X_LSB)
+
+#define IW_F2X4I12_A_LSB 6
+#define IW_F2X4I12_A_SIZE 5
+#define IW_F2X4I12_A_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F2X4I12_A_SIZE))
+#define IW_F2X4I12_A_SHIFTED_MASK (IW_F2X4I12_A_UNSHIFTED_MASK << IW_F2X4I12_A_LSB)
+#define GET_IW_F2X4I12_A(W) (((W) >> IW_F2X4I12_A_LSB) & IW_F2X4I12_A_UNSHIFTED_MASK)
+#define SET_IW_F2X4I12_A(V) (((V) & IW_F2X4I12_A_UNSHIFTED_MASK) << IW_F2X4I12_A_LSB)
+
+#define IW_F2X4I12_B_LSB 11
+#define IW_F2X4I12_B_SIZE 5
+#define IW_F2X4I12_B_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F2X4I12_B_SIZE))
+#define IW_F2X4I12_B_SHIFTED_MASK (IW_F2X4I12_B_UNSHIFTED_MASK << IW_F2X4I12_B_LSB)
+#define GET_IW_F2X4I12_B(W) (((W) >> IW_F2X4I12_B_LSB) & IW_F2X4I12_B_UNSHIFTED_MASK)
+#define SET_IW_F2X4I12_B(V) (((V) & IW_F2X4I12_B_UNSHIFTED_MASK) << IW_F2X4I12_B_LSB)
+
+#define IW_F2X4I12_IMM12_LSB 16
+#define IW_F2X4I12_IMM12_SIZE 12
+#define IW_F2X4I12_IMM12_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F2X4I12_IMM12_SIZE))
+#define IW_F2X4I12_IMM12_SHIFTED_MASK (IW_F2X4I12_IMM12_UNSHIFTED_MASK << IW_F2X4I12_IMM12_LSB)
+#define GET_IW_F2X4I12_IMM12(W) (((W) >> IW_F2X4I12_IMM12_LSB) & IW_F2X4I12_IMM12_UNSHIFTED_MASK)
+#define SET_IW_F2X4I12_IMM12(V) (((V) & IW_F2X4I12_IMM12_UNSHIFTED_MASK) << IW_F2X4I12_IMM12_LSB)
+
+#define IW_F1X4I12_A_LSB 6
+#define IW_F1X4I12_A_SIZE 5
+#define IW_F1X4I12_A_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F1X4I12_A_SIZE))
+#define IW_F1X4I12_A_SHIFTED_MASK (IW_F1X4I12_A_UNSHIFTED_MASK << IW_F1X4I12_A_LSB)
+#define GET_IW_F1X4I12_A(W) (((W) >> IW_F1X4I12_A_LSB) & IW_F1X4I12_A_UNSHIFTED_MASK)
+#define SET_IW_F1X4I12_A(V) (((V) & IW_F1X4I12_A_UNSHIFTED_MASK) << IW_F1X4I12_A_LSB)
+
+#define IW_F1X4I12_X_LSB 11
+#define IW_F1X4I12_X_SIZE 5
+#define IW_F1X4I12_X_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F1X4I12_X_SIZE))
+#define IW_F1X4I12_X_SHIFTED_MASK (IW_F1X4I12_X_UNSHIFTED_MASK << IW_F1X4I12_X_LSB)
+#define GET_IW_F1X4I12_X(W) (((W) >> IW_F1X4I12_X_LSB) & IW_F1X4I12_X_UNSHIFTED_MASK)
+#define SET_IW_F1X4I12_X(V) (((V) & IW_F1X4I12_X_UNSHIFTED_MASK) << IW_F1X4I12_X_LSB)
+
+#define IW_F1X4I12_IMM12_LSB 16
+#define IW_F1X4I12_IMM12_SIZE 12
+#define IW_F1X4I12_IMM12_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F1X4I12_IMM12_SIZE))
+#define IW_F1X4I12_IMM12_SHIFTED_MASK (IW_F1X4I12_IMM12_UNSHIFTED_MASK << IW_F1X4I12_IMM12_LSB)
+#define GET_IW_F1X4I12_IMM12(W) (((W) >> IW_F1X4I12_IMM12_LSB) & IW_F1X4I12_IMM12_UNSHIFTED_MASK)
+#define SET_IW_F1X4I12_IMM12(V) (((V) & IW_F1X4I12_IMM12_UNSHIFTED_MASK) << IW_F1X4I12_IMM12_LSB)
+
+#define IW_F1X4L17_A_LSB 6
+#define IW_F1X4L17_A_SIZE 5
+#define IW_F1X4L17_A_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F1X4L17_A_SIZE))
+#define IW_F1X4L17_A_SHIFTED_MASK (IW_F1X4L17_A_UNSHIFTED_MASK << IW_F1X4L17_A_LSB)
+#define GET_IW_F1X4L17_A(W) (((W) >> IW_F1X4L17_A_LSB) & IW_F1X4L17_A_UNSHIFTED_MASK)
+#define SET_IW_F1X4L17_A(V) (((V) & IW_F1X4L17_A_UNSHIFTED_MASK) << IW_F1X4L17_A_LSB)
+
+#define IW_F1X4L17_ID_LSB 11
+#define IW_F1X4L17_ID_SIZE 1
+#define IW_F1X4L17_ID_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F1X4L17_ID_SIZE))
+#define IW_F1X4L17_ID_SHIFTED_MASK (IW_F1X4L17_ID_UNSHIFTED_MASK << IW_F1X4L17_ID_LSB)
+#define GET_IW_F1X4L17_ID(W) (((W) >> IW_F1X4L17_ID_LSB) & IW_F1X4L17_ID_UNSHIFTED_MASK)
+#define SET_IW_F1X4L17_ID(V) (((V) & IW_F1X4L17_ID_UNSHIFTED_MASK) << IW_F1X4L17_ID_LSB)
+
+#define IW_F1X4L17_WB_LSB 12
+#define IW_F1X4L17_WB_SIZE 1
+#define IW_F1X4L17_WB_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F1X4L17_WB_SIZE))
+#define IW_F1X4L17_WB_SHIFTED_MASK (IW_F1X4L17_WB_UNSHIFTED_MASK << IW_F1X4L17_WB_LSB)
+#define GET_IW_F1X4L17_WB(W) (((W) >> IW_F1X4L17_WB_LSB) & IW_F1X4L17_WB_UNSHIFTED_MASK)
+#define SET_IW_F1X4L17_WB(V) (((V) & IW_F1X4L17_WB_UNSHIFTED_MASK) << IW_F1X4L17_WB_LSB)
+
+#define IW_F1X4L17_RS_LSB 13
+#define IW_F1X4L17_RS_SIZE 1
+#define IW_F1X4L17_RS_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F1X4L17_RS_SIZE))
+#define IW_F1X4L17_RS_SHIFTED_MASK (IW_F1X4L17_RS_UNSHIFTED_MASK << IW_F1X4L17_RS_LSB)
+#define GET_IW_F1X4L17_RS(W) (((W) >> IW_F1X4L17_RS_LSB) & IW_F1X4L17_RS_UNSHIFTED_MASK)
+#define SET_IW_F1X4L17_RS(V) (((V) & IW_F1X4L17_RS_UNSHIFTED_MASK) << IW_F1X4L17_RS_LSB)
+
+#define IW_F1X4L17_PC_LSB 14
+#define IW_F1X4L17_PC_SIZE 1
+#define IW_F1X4L17_PC_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F1X4L17_PC_SIZE))
+#define IW_F1X4L17_PC_SHIFTED_MASK (IW_F1X4L17_PC_UNSHIFTED_MASK << IW_F1X4L17_PC_LSB)
+#define GET_IW_F1X4L17_PC(W) (((W) >> IW_F1X4L17_PC_LSB) & IW_F1X4L17_PC_UNSHIFTED_MASK)
+#define SET_IW_F1X4L17_PC(V) (((V) & IW_F1X4L17_PC_UNSHIFTED_MASK) << IW_F1X4L17_PC_LSB)
+
+#define IW_F1X4L17_RSV_LSB 15
+#define IW_F1X4L17_RSV_SIZE 1
+#define IW_F1X4L17_RSV_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F1X4L17_RSV_SIZE))
+#define IW_F1X4L17_RSV_SHIFTED_MASK (IW_F1X4L17_RSV_UNSHIFTED_MASK << IW_F1X4L17_RSV_LSB)
+#define GET_IW_F1X4L17_RSV(W) (((W) >> IW_F1X4L17_RSV_LSB) & IW_F1X4L17_RSV_UNSHIFTED_MASK)
+#define SET_IW_F1X4L17_RSV(V) (((V) & IW_F1X4L17_RSV_UNSHIFTED_MASK) << IW_F1X4L17_RSV_LSB)
+
+#define IW_F1X4L17_REGMASK_LSB 16
+#define IW_F1X4L17_REGMASK_SIZE 12
+#define IW_F1X4L17_REGMASK_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F1X4L17_REGMASK_SIZE))
+#define IW_F1X4L17_REGMASK_SHIFTED_MASK (IW_F1X4L17_REGMASK_UNSHIFTED_MASK << IW_F1X4L17_REGMASK_LSB)
+#define GET_IW_F1X4L17_REGMASK(W) (((W) >> IW_F1X4L17_REGMASK_LSB) & IW_F1X4L17_REGMASK_UNSHIFTED_MASK)
+#define SET_IW_F1X4L17_REGMASK(V) (((V) & IW_F1X4L17_REGMASK_UNSHIFTED_MASK) << IW_F1X4L17_REGMASK_LSB)
+
+/* Shared by OPX-group formats F3X6L5, F2X6L10, F3X6.  */
+#define IW_OPX_X_LSB 26
+#define IW_OPX_X_SIZE 6
+#define IW_OPX_X_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_OPX_X_SIZE))
+#define IW_OPX_X_SHIFTED_MASK (IW_OPX_X_UNSHIFTED_MASK << IW_OPX_X_LSB)
+#define GET_IW_OPX_X(W) (((W) >> IW_OPX_X_LSB) & IW_OPX_X_UNSHIFTED_MASK)
+#define SET_IW_OPX_X(V) (((V) & IW_OPX_X_UNSHIFTED_MASK) << IW_OPX_X_LSB)
+
+/* F3X6L5 accessors are also used for F3X6 formats.  */
+#define IW_F3X6L5_A_LSB 6
+#define IW_F3X6L5_A_SIZE 5
+#define IW_F3X6L5_A_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F3X6L5_A_SIZE))
+#define IW_F3X6L5_A_SHIFTED_MASK (IW_F3X6L5_A_UNSHIFTED_MASK << IW_F3X6L5_A_LSB)
+#define GET_IW_F3X6L5_A(W) (((W) >> IW_F3X6L5_A_LSB) & IW_F3X6L5_A_UNSHIFTED_MASK)
+#define SET_IW_F3X6L5_A(V) (((V) & IW_F3X6L5_A_UNSHIFTED_MASK) << IW_F3X6L5_A_LSB)
+
+#define IW_F3X6L5_B_LSB 11
+#define IW_F3X6L5_B_SIZE 5
+#define IW_F3X6L5_B_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F3X6L5_B_SIZE))
+#define IW_F3X6L5_B_SHIFTED_MASK (IW_F3X6L5_B_UNSHIFTED_MASK << IW_F3X6L5_B_LSB)
+#define GET_IW_F3X6L5_B(W) (((W) >> IW_F3X6L5_B_LSB) & IW_F3X6L5_B_UNSHIFTED_MASK)
+#define SET_IW_F3X6L5_B(V) (((V) & IW_F3X6L5_B_UNSHIFTED_MASK) << IW_F3X6L5_B_LSB)
+
+#define IW_F3X6L5_C_LSB 16
+#define IW_F3X6L5_C_SIZE 5
+#define IW_F3X6L5_C_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F3X6L5_C_SIZE))
+#define IW_F3X6L5_C_SHIFTED_MASK (IW_F3X6L5_C_UNSHIFTED_MASK << IW_F3X6L5_C_LSB)
+#define GET_IW_F3X6L5_C(W) (((W) >> IW_F3X6L5_C_LSB) & IW_F3X6L5_C_UNSHIFTED_MASK)
+#define SET_IW_F3X6L5_C(V) (((V) & IW_F3X6L5_C_UNSHIFTED_MASK) << IW_F3X6L5_C_LSB)
+
+#define IW_F3X6L5_IMM5_LSB 21
+#define IW_F3X6L5_IMM5_SIZE 5
+#define IW_F3X6L5_IMM5_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F3X6L5_IMM5_SIZE))
+#define IW_F3X6L5_IMM5_SHIFTED_MASK (IW_F3X6L5_IMM5_UNSHIFTED_MASK << IW_F3X6L5_IMM5_LSB)
+#define GET_IW_F3X6L5_IMM5(W) (((W) >> IW_F3X6L5_IMM5_LSB) & IW_F3X6L5_IMM5_UNSHIFTED_MASK)
+#define SET_IW_F3X6L5_IMM5(V) (((V) & IW_F3X6L5_IMM5_UNSHIFTED_MASK) << IW_F3X6L5_IMM5_LSB)
+
+#define IW_F2X6L10_A_LSB 6
+#define IW_F2X6L10_A_SIZE 5
+#define IW_F2X6L10_A_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F2X6L10_A_SIZE))
+#define IW_F2X6L10_A_SHIFTED_MASK (IW_F2X6L10_A_UNSHIFTED_MASK << IW_F2X6L10_A_LSB)
+#define GET_IW_F2X6L10_A(W) (((W) >> IW_F2X6L10_A_LSB) & IW_F2X6L10_A_UNSHIFTED_MASK)
+#define SET_IW_F2X6L10_A(V) (((V) & IW_F2X6L10_A_UNSHIFTED_MASK) << IW_F2X6L10_A_LSB)
+
+#define IW_F2X6L10_B_LSB 11
+#define IW_F2X6L10_B_SIZE 5
+#define IW_F2X6L10_B_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F2X6L10_B_SIZE))
+#define IW_F2X6L10_B_SHIFTED_MASK (IW_F2X6L10_B_UNSHIFTED_MASK << IW_F2X6L10_B_LSB)
+#define GET_IW_F2X6L10_B(W) (((W) >> IW_F2X6L10_B_LSB) & IW_F2X6L10_B_UNSHIFTED_MASK)
+#define SET_IW_F2X6L10_B(V) (((V) & IW_F2X6L10_B_UNSHIFTED_MASK) << IW_F2X6L10_B_LSB)
+
+#define IW_F2X6L10_LSB_LSB 16
+#define IW_F2X6L10_LSB_SIZE 5
+#define IW_F2X6L10_LSB_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F2X6L10_LSB_SIZE))
+#define IW_F2X6L10_LSB_SHIFTED_MASK (IW_F2X6L10_LSB_UNSHIFTED_MASK << IW_F2X6L10_LSB_LSB)
+#define GET_IW_F2X6L10_LSB(W) (((W) >> IW_F2X6L10_LSB_LSB) & IW_F2X6L10_LSB_UNSHIFTED_MASK)
+#define SET_IW_F2X6L10_LSB(V) (((V) & IW_F2X6L10_LSB_UNSHIFTED_MASK) << IW_F2X6L10_LSB_LSB)
+
+#define IW_F2X6L10_MSB_LSB 21
+#define IW_F2X6L10_MSB_SIZE 5
+#define IW_F2X6L10_MSB_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F2X6L10_MSB_SIZE))
+#define IW_F2X6L10_MSB_SHIFTED_MASK (IW_F2X6L10_MSB_UNSHIFTED_MASK << IW_F2X6L10_MSB_LSB)
+#define GET_IW_F2X6L10_MSB(W) (((W) >> IW_F2X6L10_MSB_LSB) & IW_F2X6L10_MSB_UNSHIFTED_MASK)
+#define SET_IW_F2X6L10_MSB(V) (((V) & IW_F2X6L10_MSB_UNSHIFTED_MASK) << IW_F2X6L10_MSB_LSB)
+
+#define IW_F3X8_A_LSB 6
+#define IW_F3X8_A_SIZE 5
+#define IW_F3X8_A_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F3X8_A_SIZE))
+#define IW_F3X8_A_SHIFTED_MASK (IW_F3X8_A_UNSHIFTED_MASK << IW_F3X8_A_LSB)
+#define GET_IW_F3X8_A(W) (((W) >> IW_F3X8_A_LSB) & IW_F3X8_A_UNSHIFTED_MASK)
+#define SET_IW_F3X8_A(V) (((V) & IW_F3X8_A_UNSHIFTED_MASK) << IW_F3X8_A_LSB)
+
+#define IW_F3X8_B_LSB 11
+#define IW_F3X8_B_SIZE 5
+#define IW_F3X8_B_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F3X8_B_SIZE))
+#define IW_F3X8_B_SHIFTED_MASK (IW_F3X8_B_UNSHIFTED_MASK << IW_F3X8_B_LSB)
+#define GET_IW_F3X8_B(W) (((W) >> IW_F3X8_B_LSB) & IW_F3X8_B_UNSHIFTED_MASK)
+#define SET_IW_F3X8_B(V) (((V) & IW_F3X8_B_UNSHIFTED_MASK) << IW_F3X8_B_LSB)
+
+#define IW_F3X8_C_LSB 16
+#define IW_F3X8_C_SIZE 5
+#define IW_F3X8_C_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F3X8_C_SIZE))
+#define IW_F3X8_C_SHIFTED_MASK (IW_F3X8_C_UNSHIFTED_MASK << IW_F3X8_C_LSB)
+#define GET_IW_F3X8_C(W) (((W) >> IW_F3X8_C_LSB) & IW_F3X8_C_UNSHIFTED_MASK)
+#define SET_IW_F3X8_C(V) (((V) & IW_F3X8_C_UNSHIFTED_MASK) << IW_F3X8_C_LSB)
+
+#define IW_F3X8_READA_LSB 21
+#define IW_F3X8_READA_SIZE 1
+#define IW_F3X8_READA_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F3X8_READA_SIZE))
+#define IW_F3X8_READA_SHIFTED_MASK (IW_F3X8_READA_UNSHIFTED_MASK << IW_F3X8_READA_LSB)
+#define GET_IW_F3X8_READA(W) (((W) >> IW_F3X8_READA_LSB) & IW_F3X8_READA_UNSHIFTED_MASK)
+#define SET_IW_F3X8_READA(V) (((V) & IW_F3X8_READA_UNSHIFTED_MASK) << IW_F3X8_READA_LSB)
+
+#define IW_F3X8_READB_LSB 22
+#define IW_F3X8_READB_SIZE 1
+#define IW_F3X8_READB_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F3X8_READB_SIZE))
+#define IW_F3X8_READB_SHIFTED_MASK (IW_F3X8_READB_UNSHIFTED_MASK << IW_F3X8_READB_LSB)
+#define GET_IW_F3X8_READB(W) (((W) >> IW_F3X8_READB_LSB) & IW_F3X8_READB_UNSHIFTED_MASK)
+#define SET_IW_F3X8_READB(V) (((V) & IW_F3X8_READB_UNSHIFTED_MASK) << IW_F3X8_READB_LSB)
+
+#define IW_F3X8_READC_LSB 23
+#define IW_F3X8_READC_SIZE 1
+#define IW_F3X8_READC_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F3X8_READC_SIZE))
+#define IW_F3X8_READC_SHIFTED_MASK (IW_F3X8_READC_UNSHIFTED_MASK << IW_F3X8_READC_LSB)
+#define GET_IW_F3X8_READC(W) (((W) >> IW_F3X8_READC_LSB) & IW_F3X8_READC_UNSHIFTED_MASK)
+#define SET_IW_F3X8_READC(V) (((V) & IW_F3X8_READC_UNSHIFTED_MASK) << IW_F3X8_READC_LSB)
+
+#define IW_F3X8_N_LSB 24
+#define IW_F3X8_N_SIZE 8
+#define IW_F3X8_N_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F3X8_N_SIZE))
+#define IW_F3X8_N_SHIFTED_MASK (IW_F3X8_N_UNSHIFTED_MASK << IW_F3X8_N_LSB)
+#define GET_IW_F3X8_N(W) (((W) >> IW_F3X8_N_LSB) & IW_F3X8_N_UNSHIFTED_MASK)
+#define SET_IW_F3X8_N(V) (((V) & IW_F3X8_N_UNSHIFTED_MASK) << IW_F3X8_N_LSB)
+
+/* 16-bit R2 fields.  */
+
+#define IW_I10_IMM10_LSB 6
+#define IW_I10_IMM10_SIZE 10
+#define IW_I10_IMM10_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_I10_IMM10_SIZE))
+#define IW_I10_IMM10_SHIFTED_MASK (IW_I10_IMM10_UNSHIFTED_MASK << IW_I10_IMM10_LSB)
+#define GET_IW_I10_IMM10(W) (((W) >> IW_I10_IMM10_LSB) & IW_I10_IMM10_UNSHIFTED_MASK)
+#define SET_IW_I10_IMM10(V) (((V) & IW_I10_IMM10_UNSHIFTED_MASK) << IW_I10_IMM10_LSB)
+
+#define IW_T1I7_A3_LSB 6
+#define IW_T1I7_A3_SIZE 3
+#define IW_T1I7_A3_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T1I7_A3_SIZE))
+#define IW_T1I7_A3_SHIFTED_MASK (IW_T1I7_A3_UNSHIFTED_MASK << IW_T1I7_A3_LSB)
+#define GET_IW_T1I7_A3(W) (((W) >> IW_T1I7_A3_LSB) & IW_T1I7_A3_UNSHIFTED_MASK)
+#define SET_IW_T1I7_A3(V) (((V) & IW_T1I7_A3_UNSHIFTED_MASK) << IW_T1I7_A3_LSB)
+
+#define IW_T1I7_IMM7_LSB 9
+#define IW_T1I7_IMM7_SIZE 7
+#define IW_T1I7_IMM7_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T1I7_IMM7_SIZE))
+#define IW_T1I7_IMM7_SHIFTED_MASK (IW_T1I7_IMM7_UNSHIFTED_MASK << IW_T1I7_IMM7_LSB)
+#define GET_IW_T1I7_IMM7(W) (((W) >> IW_T1I7_IMM7_LSB) & IW_T1I7_IMM7_UNSHIFTED_MASK)
+#define SET_IW_T1I7_IMM7(V) (((V) & IW_T1I7_IMM7_UNSHIFTED_MASK) << IW_T1I7_IMM7_LSB)
+
+#define IW_T2I4_A3_LSB 6
+#define IW_T2I4_A3_SIZE 3
+#define IW_T2I4_A3_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T2I4_A3_SIZE))
+#define IW_T2I4_A3_SHIFTED_MASK (IW_T2I4_A3_UNSHIFTED_MASK << IW_T2I4_A3_LSB)
+#define GET_IW_T2I4_A3(W) (((W) >> IW_T2I4_A3_LSB) & IW_T2I4_A3_UNSHIFTED_MASK)
+#define SET_IW_T2I4_A3(V) (((V) & IW_T2I4_A3_UNSHIFTED_MASK) << IW_T2I4_A3_LSB)
+
+#define IW_T2I4_B3_LSB 9
+#define IW_T2I4_B3_SIZE 3
+#define IW_T2I4_B3_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T2I4_B3_SIZE))
+#define IW_T2I4_B3_SHIFTED_MASK (IW_T2I4_B3_UNSHIFTED_MASK << IW_T2I4_B3_LSB)
+#define GET_IW_T2I4_B3(W) (((W) >> IW_T2I4_B3_LSB) & IW_T2I4_B3_UNSHIFTED_MASK)
+#define SET_IW_T2I4_B3(V) (((V) & IW_T2I4_B3_UNSHIFTED_MASK) << IW_T2I4_B3_LSB)
+
+#define IW_T2I4_IMM4_LSB 12
+#define IW_T2I4_IMM4_SIZE 4
+#define IW_T2I4_IMM4_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T2I4_IMM4_SIZE))
+#define IW_T2I4_IMM4_SHIFTED_MASK (IW_T2I4_IMM4_UNSHIFTED_MASK << IW_T2I4_IMM4_LSB)
+#define GET_IW_T2I4_IMM4(W) (((W) >> IW_T2I4_IMM4_LSB) & IW_T2I4_IMM4_UNSHIFTED_MASK)
+#define SET_IW_T2I4_IMM4(V) (((V) & IW_T2I4_IMM4_UNSHIFTED_MASK) << IW_T2I4_IMM4_LSB)
+
+#define IW_T1X1I6_A3_LSB 6
+#define IW_T1X1I6_A3_SIZE 3
+#define IW_T1X1I6_A3_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T1X1I6_A3_SIZE))
+#define IW_T1X1I6_A3_SHIFTED_MASK (IW_T1X1I6_A3_UNSHIFTED_MASK << IW_T1X1I6_A3_LSB)
+#define GET_IW_T1X1I6_A3(W) (((W) >> IW_T1X1I6_A3_LSB) & IW_T1X1I6_A3_UNSHIFTED_MASK)
+#define SET_IW_T1X1I6_A3(V) (((V) & IW_T1X1I6_A3_UNSHIFTED_MASK) << IW_T1X1I6_A3_LSB)
+
+#define IW_T1X1I6_IMM6_LSB 9
+#define IW_T1X1I6_IMM6_SIZE 6
+#define IW_T1X1I6_IMM6_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T1X1I6_IMM6_SIZE))
+#define IW_T1X1I6_IMM6_SHIFTED_MASK (IW_T1X1I6_IMM6_UNSHIFTED_MASK << IW_T1X1I6_IMM6_LSB)
+#define GET_IW_T1X1I6_IMM6(W) (((W) >> IW_T1X1I6_IMM6_LSB) & IW_T1X1I6_IMM6_UNSHIFTED_MASK)
+#define SET_IW_T1X1I6_IMM6(V) (((V) & IW_T1X1I6_IMM6_UNSHIFTED_MASK) << IW_T1X1I6_IMM6_LSB)
+
+#define IW_T1X1I6_X_LSB 15
+#define IW_T1X1I6_X_SIZE 1
+#define IW_T1X1I6_X_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T1X1I6_X_SIZE))
+#define IW_T1X1I6_X_SHIFTED_MASK (IW_T1X1I6_X_UNSHIFTED_MASK << IW_T1X1I6_X_LSB)
+#define GET_IW_T1X1I6_X(W) (((W) >> IW_T1X1I6_X_LSB) & IW_T1X1I6_X_UNSHIFTED_MASK)
+#define SET_IW_T1X1I6_X(V) (((V) & IW_T1X1I6_X_UNSHIFTED_MASK) << IW_T1X1I6_X_LSB)
+
+#define IW_X1I7_IMM7_LSB 6
+#define IW_X1I7_IMM7_SIZE 7
+#define IW_X1I7_IMM7_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_X1I7_IMM7_SIZE))
+#define IW_X1I7_IMM7_SHIFTED_MASK (IW_X1I7_IMM7_UNSHIFTED_MASK << IW_X1I7_IMM7_LSB)
+#define GET_IW_X1I7_IMM7(W) (((W) >> IW_X1I7_IMM7_LSB) & IW_X1I7_IMM7_UNSHIFTED_MASK)
+#define SET_IW_X1I7_IMM7(V) (((V) & IW_X1I7_IMM7_UNSHIFTED_MASK) << IW_X1I7_IMM7_LSB)
+
+#define IW_X1I7_RSV_LSB 13
+#define IW_X1I7_RSV_SIZE 2
+#define IW_X1I7_RSV_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_X1I7_RSV_SIZE))
+#define IW_X1I7_RSV_SHIFTED_MASK (IW_X1I7_RSV_UNSHIFTED_MASK << IW_X1I7_RSV_LSB)
+#define GET_IW_X1I7_RSV(W) (((W) >> IW_X1I7_RSV_LSB) & IW_X1I7_RSV_UNSHIFTED_MASK)
+#define SET_IW_X1I7_RSV(V) (((V) & IW_X1I7_RSV_UNSHIFTED_MASK) << IW_X1I7_RSV_LSB)
+
+#define IW_X1I7_X_LSB 15
+#define IW_X1I7_X_SIZE 1
+#define IW_X1I7_X_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_X1I7_X_SIZE))
+#define IW_X1I7_X_SHIFTED_MASK (IW_X1I7_X_UNSHIFTED_MASK << IW_X1I7_X_LSB)
+#define GET_IW_X1I7_X(W) (((W) >> IW_X1I7_X_LSB) & IW_X1I7_X_UNSHIFTED_MASK)
+#define SET_IW_X1I7_X(V) (((V) & IW_X1I7_X_UNSHIFTED_MASK) << IW_X1I7_X_LSB)
+
+#define IW_L5I4X1_IMM4_LSB 6
+#define IW_L5I4X1_IMM4_SIZE 4
+#define IW_L5I4X1_IMM4_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_L5I4X1_IMM4_SIZE))
+#define IW_L5I4X1_IMM4_SHIFTED_MASK (IW_L5I4X1_IMM4_UNSHIFTED_MASK << IW_L5I4X1_IMM4_LSB)
+#define GET_IW_L5I4X1_IMM4(W) (((W) >> IW_L5I4X1_IMM4_LSB) & IW_L5I4X1_IMM4_UNSHIFTED_MASK)
+#define SET_IW_L5I4X1_IMM4(V) (((V) & IW_L5I4X1_IMM4_UNSHIFTED_MASK) << IW_L5I4X1_IMM4_LSB)
+
+#define IW_L5I4X1_REGRANGE_LSB 10
+#define IW_L5I4X1_REGRANGE_SIZE 3
+#define IW_L5I4X1_REGRANGE_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_L5I4X1_REGRANGE_SIZE))
+#define IW_L5I4X1_REGRANGE_SHIFTED_MASK (IW_L5I4X1_REGRANGE_UNSHIFTED_MASK << IW_L5I4X1_REGRANGE_LSB)
+#define GET_IW_L5I4X1_REGRANGE(W) (((W) >> IW_L5I4X1_REGRANGE_LSB) & IW_L5I4X1_REGRANGE_UNSHIFTED_MASK)
+#define SET_IW_L5I4X1_REGRANGE(V) (((V) & IW_L5I4X1_REGRANGE_UNSHIFTED_MASK) << IW_L5I4X1_REGRANGE_LSB)
+
+#define IW_L5I4X1_FP_LSB 13
+#define IW_L5I4X1_FP_SIZE 1
+#define IW_L5I4X1_FP_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_L5I4X1_FP_SIZE))
+#define IW_L5I4X1_FP_SHIFTED_MASK (IW_L5I4X1_FP_UNSHIFTED_MASK << IW_L5I4X1_FP_LSB)
+#define GET_IW_L5I4X1_FP(W) (((W) >> IW_L5I4X1_FP_LSB) & IW_L5I4X1_FP_UNSHIFTED_MASK)
+#define SET_IW_L5I4X1_FP(V) (((V) & IW_L5I4X1_FP_UNSHIFTED_MASK) << IW_L5I4X1_FP_LSB)
+
+#define IW_L5I4X1_CS_LSB 14
+#define IW_L5I4X1_CS_SIZE 1
+#define IW_L5I4X1_CS_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_L5I4X1_CS_SIZE))
+#define IW_L5I4X1_CS_SHIFTED_MASK (IW_L5I4X1_CS_UNSHIFTED_MASK << IW_L5I4X1_CS_LSB)
+#define GET_IW_L5I4X1_CS(W) (((W) >> IW_L5I4X1_CS_LSB) & IW_L5I4X1_CS_UNSHIFTED_MASK)
+#define SET_IW_L5I4X1_CS(V) (((V) & IW_L5I4X1_CS_UNSHIFTED_MASK) << IW_L5I4X1_CS_LSB)
+
+#define IW_L5I4X1_X_LSB 15
+#define IW_L5I4X1_X_SIZE 1
+#define IW_L5I4X1_X_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_L5I4X1_X_SIZE))
+#define IW_L5I4X1_X_SHIFTED_MASK (IW_L5I4X1_X_UNSHIFTED_MASK << IW_L5I4X1_X_LSB)
+#define GET_IW_L5I4X1_X(W) (((W) >> IW_L5I4X1_X_LSB) & IW_L5I4X1_X_UNSHIFTED_MASK)
+#define SET_IW_L5I4X1_X(V) (((V) & IW_L5I4X1_X_UNSHIFTED_MASK) << IW_L5I4X1_X_LSB)
+
+#define IW_T2X1L3_A3_LSB 6
+#define IW_T2X1L3_A3_SIZE 3
+#define IW_T2X1L3_A3_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T2X1L3_A3_SIZE))
+#define IW_T2X1L3_A3_SHIFTED_MASK (IW_T2X1L3_A3_UNSHIFTED_MASK << IW_T2X1L3_A3_LSB)
+#define GET_IW_T2X1L3_A3(W) (((W) >> IW_T2X1L3_A3_LSB) & IW_T2X1L3_A3_UNSHIFTED_MASK)
+#define SET_IW_T2X1L3_A3(V) (((V) & IW_T2X1L3_A3_UNSHIFTED_MASK) << IW_T2X1L3_A3_LSB)
+
+#define IW_T2X1L3_B3_LSB 9
+#define IW_T2X1L3_B3_SIZE 3
+#define IW_T2X1L3_B3_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T2X1L3_B3_SIZE))
+#define IW_T2X1L3_B3_SHIFTED_MASK (IW_T2X1L3_B3_UNSHIFTED_MASK << IW_T2X1L3_B3_LSB)
+#define GET_IW_T2X1L3_B3(W) (((W) >> IW_T2X1L3_B3_LSB) & IW_T2X1L3_B3_UNSHIFTED_MASK)
+#define SET_IW_T2X1L3_B3(V) (((V) & IW_T2X1L3_B3_UNSHIFTED_MASK) << IW_T2X1L3_B3_LSB)
+
+#define IW_T2X1L3_SHAMT_LSB 12
+#define IW_T2X1L3_SHAMT_SIZE 3
+#define IW_T2X1L3_SHAMT_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T2X1L3_SHAMT_SIZE))
+#define IW_T2X1L3_SHAMT_SHIFTED_MASK (IW_T2X1L3_SHAMT_UNSHIFTED_MASK << IW_T2X1L3_SHAMT_LSB)
+#define GET_IW_T2X1L3_SHAMT(W) (((W) >> IW_T2X1L3_SHAMT_LSB) & IW_T2X1L3_SHAMT_UNSHIFTED_MASK)
+#define SET_IW_T2X1L3_SHAMT(V) (((V) & IW_T2X1L3_SHAMT_UNSHIFTED_MASK) << IW_T2X1L3_SHAMT_LSB)
+
+#define IW_T2X1L3_X_LSB 15
+#define IW_T2X1L3_X_SIZE 1
+#define IW_T2X1L3_X_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T2X1L3_X_SIZE))
+#define IW_T2X1L3_X_SHIFTED_MASK (IW_T2X1L3_X_UNSHIFTED_MASK << IW_T2X1L3_X_LSB)
+#define GET_IW_T2X1L3_X(W) (((W) >> IW_T2X1L3_X_LSB) & IW_T2X1L3_X_UNSHIFTED_MASK)
+#define SET_IW_T2X1L3_X(V) (((V) & IW_T2X1L3_X_UNSHIFTED_MASK) << IW_T2X1L3_X_LSB)
+
+#define IW_T2X1I3_A3_LSB 6
+#define IW_T2X1I3_A3_SIZE 3
+#define IW_T2X1I3_A3_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T2X1I3_A3_SIZE))
+#define IW_T2X1I3_A3_SHIFTED_MASK (IW_T2X1I3_A3_UNSHIFTED_MASK << IW_T2X1I3_A3_LSB)
+#define GET_IW_T2X1I3_A3(W) (((W) >> IW_T2X1I3_A3_LSB) & IW_T2X1I3_A3_UNSHIFTED_MASK)
+#define SET_IW_T2X1I3_A3(V) (((V) & IW_T2X1I3_A3_UNSHIFTED_MASK) << IW_T2X1I3_A3_LSB)
+
+#define IW_T2X1I3_B3_LSB 9
+#define IW_T2X1I3_B3_SIZE 3
+#define IW_T2X1I3_B3_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T2X1I3_B3_SIZE))
+#define IW_T2X1I3_B3_SHIFTED_MASK (IW_T2X1I3_B3_UNSHIFTED_MASK << IW_T2X1I3_B3_LSB)
+#define GET_IW_T2X1I3_B3(W) (((W) >> IW_T2X1I3_B3_LSB) & IW_T2X1I3_B3_UNSHIFTED_MASK)
+#define SET_IW_T2X1I3_B3(V) (((V) & IW_T2X1I3_B3_UNSHIFTED_MASK) << IW_T2X1I3_B3_LSB)
+
+#define IW_T2X1I3_IMM3_LSB 12
+#define IW_T2X1I3_IMM3_SIZE 3
+#define IW_T2X1I3_IMM3_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T2X1I3_IMM3_SIZE))
+#define IW_T2X1I3_IMM3_SHIFTED_MASK (IW_T2X1I3_IMM3_UNSHIFTED_MASK << IW_T2X1I3_IMM3_LSB)
+#define GET_IW_T2X1I3_IMM3(W) (((W) >> IW_T2X1I3_IMM3_LSB) & IW_T2X1I3_IMM3_UNSHIFTED_MASK)
+#define SET_IW_T2X1I3_IMM3(V) (((V) & IW_T2X1I3_IMM3_UNSHIFTED_MASK) << IW_T2X1I3_IMM3_LSB)
+
+#define IW_T2X1I3_X_LSB 15
+#define IW_T2X1I3_X_SIZE 1
+#define IW_T2X1I3_X_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T2X1I3_X_SIZE))
+#define IW_T2X1I3_X_SHIFTED_MASK (IW_T2X1I3_X_UNSHIFTED_MASK << IW_T2X1I3_X_LSB)
+#define GET_IW_T2X1I3_X(W) (((W) >> IW_T2X1I3_X_LSB) & IW_T2X1I3_X_UNSHIFTED_MASK)
+#define SET_IW_T2X1I3_X(V) (((V) & IW_T2X1I3_X_UNSHIFTED_MASK) << IW_T2X1I3_X_LSB)
+
+#define IW_T3X1_A3_LSB 6
+#define IW_T3X1_A3_SIZE 3
+#define IW_T3X1_A3_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T3X1_A3_SIZE))
+#define IW_T3X1_A3_SHIFTED_MASK (IW_T3X1_A3_UNSHIFTED_MASK << IW_T3X1_A3_LSB)
+#define GET_IW_T3X1_A3(W) (((W) >> IW_T3X1_A3_LSB) & IW_T3X1_A3_UNSHIFTED_MASK)
+#define SET_IW_T3X1_A3(V) (((V) & IW_T3X1_A3_UNSHIFTED_MASK) << IW_T3X1_A3_LSB)
+
+#define IW_T3X1_B3_LSB 9
+#define IW_T3X1_B3_SIZE 3
+#define IW_T3X1_B3_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T3X1_B3_SIZE))
+#define IW_T3X1_B3_SHIFTED_MASK (IW_T3X1_B3_UNSHIFTED_MASK << IW_T3X1_B3_LSB)
+#define GET_IW_T3X1_B3(W) (((W) >> IW_T3X1_B3_LSB) & IW_T3X1_B3_UNSHIFTED_MASK)
+#define SET_IW_T3X1_B3(V) (((V) & IW_T3X1_B3_UNSHIFTED_MASK) << IW_T3X1_B3_LSB)
+
+#define IW_T3X1_C3_LSB 12
+#define IW_T3X1_C3_SIZE 3
+#define IW_T3X1_C3_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T3X1_C3_SIZE))
+#define IW_T3X1_C3_SHIFTED_MASK (IW_T3X1_C3_UNSHIFTED_MASK << IW_T3X1_C3_LSB)
+#define GET_IW_T3X1_C3(W) (((W) >> IW_T3X1_C3_LSB) & IW_T3X1_C3_UNSHIFTED_MASK)
+#define SET_IW_T3X1_C3(V) (((V) & IW_T3X1_C3_UNSHIFTED_MASK) << IW_T3X1_C3_LSB)
+
+#define IW_T3X1_X_LSB 15
+#define IW_T3X1_X_SIZE 1
+#define IW_T3X1_X_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T3X1_X_SIZE))
+#define IW_T3X1_X_SHIFTED_MASK (IW_T3X1_X_UNSHIFTED_MASK << IW_T3X1_X_LSB)
+#define GET_IW_T3X1_X(W) (((W) >> IW_T3X1_X_LSB) & IW_T3X1_X_UNSHIFTED_MASK)
+#define SET_IW_T3X1_X(V) (((V) & IW_T3X1_X_UNSHIFTED_MASK) << IW_T3X1_X_LSB)
+
+/* The X field for all three R.N-class instruction formats is represented
+   here as 4 bits, including the bits defined as constant 0 or 1 that
+   determine which of the formats T2X3, F1X1, or X2L5 it is.  */
+#define IW_R_N_X_LSB 12
+#define IW_R_N_X_SIZE 4
+#define IW_R_N_X_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_R_N_X_SIZE))
+#define IW_R_N_X_SHIFTED_MASK (IW_R_N_X_UNSHIFTED_MASK << IW_R_N_X_LSB)
+#define GET_IW_R_N_X(W) (((W) >> IW_R_N_X_LSB) & IW_R_N_X_UNSHIFTED_MASK)
+#define SET_IW_R_N_X(V) (((V) & IW_R_N_X_UNSHIFTED_MASK) << IW_R_N_X_LSB)
+
+#define IW_T2X3_A3_LSB 6
+#define IW_T2X3_A3_SIZE 3
+#define IW_T2X3_A3_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T2X3_A3_SIZE))
+#define IW_T2X3_A3_SHIFTED_MASK (IW_T2X3_A3_UNSHIFTED_MASK << IW_T2X3_A3_LSB)
+#define GET_IW_T2X3_A3(W) (((W) >> IW_T2X3_A3_LSB) & IW_T2X3_A3_UNSHIFTED_MASK)
+#define SET_IW_T2X3_A3(V) (((V) & IW_T2X3_A3_UNSHIFTED_MASK) << IW_T2X3_A3_LSB)
+
+#define IW_T2X3_B3_LSB 9
+#define IW_T2X3_B3_SIZE 3
+#define IW_T2X3_B3_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_T2X3_B3_SIZE))
+#define IW_T2X3_B3_SHIFTED_MASK (IW_T2X3_B3_UNSHIFTED_MASK << IW_T2X3_B3_LSB)
+#define GET_IW_T2X3_B3(W) (((W) >> IW_T2X3_B3_LSB) & IW_T2X3_B3_UNSHIFTED_MASK)
+#define SET_IW_T2X3_B3(V) (((V) & IW_T2X3_B3_UNSHIFTED_MASK) << IW_T2X3_B3_LSB)
+
+#define IW_F1X1_A_LSB 6
+#define IW_F1X1_A_SIZE 5
+#define IW_F1X1_A_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F1X1_A_SIZE))
+#define IW_F1X1_A_SHIFTED_MASK (IW_F1X1_A_UNSHIFTED_MASK << IW_F1X1_A_LSB)
+#define GET_IW_F1X1_A(W) (((W) >> IW_F1X1_A_LSB) & IW_F1X1_A_UNSHIFTED_MASK)
+#define SET_IW_F1X1_A(V) (((V) & IW_F1X1_A_UNSHIFTED_MASK) << IW_F1X1_A_LSB)
+
+#define IW_F1X1_RSV_LSB 11
+#define IW_F1X1_RSV_SIZE 1
+#define IW_F1X1_RSV_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F1X1_RSV_SIZE))
+#define IW_F1X1_RSV_SHIFTED_MASK (IW_F1X1_RSV_UNSHIFTED_MASK << IW_F1X1_RSV_LSB)
+#define GET_IW_F1X1_RSV(W) (((W) >> IW_F1X1_RSV_LSB) & IW_F1X1_RSV_UNSHIFTED_MASK)
+#define SET_IW_F1X1_RSV(V) (((V) & IW_F1X1_RSV_UNSHIFTED_MASK) << IW_F1X1_RSV_LSB)
+
+#define IW_X2L5_IMM5_LSB 6
+#define IW_X2L5_IMM5_SIZE 5
+#define IW_X2L5_IMM5_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_X2L5_IMM5_SIZE))
+#define IW_X2L5_IMM5_SHIFTED_MASK (IW_X2L5_IMM5_UNSHIFTED_MASK << IW_X2L5_IMM5_LSB)
+#define GET_IW_X2L5_IMM5(W) (((W) >> IW_X2L5_IMM5_LSB) & IW_X2L5_IMM5_UNSHIFTED_MASK)
+#define SET_IW_X2L5_IMM5(V) (((V) & IW_X2L5_IMM5_UNSHIFTED_MASK) << IW_X2L5_IMM5_LSB)
+
+#define IW_X2L5_RSV_LSB 11
+#define IW_X2L5_RSV_SIZE 1
+#define IW_X2L5_RSV_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_X2L5_RSV_SIZE))
+#define IW_X2L5_RSV_SHIFTED_MASK (IW_X2L5_RSV_UNSHIFTED_MASK << IW_X2L5_RSV_LSB)
+#define GET_IW_X2L5_RSV(W) (((W) >> IW_X2L5_RSV_LSB) & IW_X2L5_RSV_UNSHIFTED_MASK)
+#define SET_IW_X2L5_RSV(V) (((V) & IW_X2L5_RSV_UNSHIFTED_MASK) << IW_X2L5_RSV_LSB)
+
+#define IW_F1I5_IMM5_LSB 6
+#define IW_F1I5_IMM5_SIZE 5
+#define IW_F1I5_IMM5_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F1I5_IMM5_SIZE))
+#define IW_F1I5_IMM5_SHIFTED_MASK (IW_F1I5_IMM5_UNSHIFTED_MASK << IW_F1I5_IMM5_LSB)
+#define GET_IW_F1I5_IMM5(W) (((W) >> IW_F1I5_IMM5_LSB) & IW_F1I5_IMM5_UNSHIFTED_MASK)
+#define SET_IW_F1I5_IMM5(V) (((V) & IW_F1I5_IMM5_UNSHIFTED_MASK) << IW_F1I5_IMM5_LSB)
+
+#define IW_F1I5_B_LSB 11
+#define IW_F1I5_B_SIZE 5
+#define IW_F1I5_B_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F1I5_B_SIZE))
+#define IW_F1I5_B_SHIFTED_MASK (IW_F1I5_B_UNSHIFTED_MASK << IW_F1I5_B_LSB)
+#define GET_IW_F1I5_B(W) (((W) >> IW_F1I5_B_LSB) & IW_F1I5_B_UNSHIFTED_MASK)
+#define SET_IW_F1I5_B(V) (((V) & IW_F1I5_B_UNSHIFTED_MASK) << IW_F1I5_B_LSB)
+
+#define IW_F2_A_LSB 6
+#define IW_F2_A_SIZE 5
+#define IW_F2_A_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F2_A_SIZE))
+#define IW_F2_A_SHIFTED_MASK (IW_F2_A_UNSHIFTED_MASK << IW_F2_A_LSB)
+#define GET_IW_F2_A(W) (((W) >> IW_F2_A_LSB) & IW_F2_A_UNSHIFTED_MASK)
+#define SET_IW_F2_A(V) (((V) & IW_F2_A_UNSHIFTED_MASK) << IW_F2_A_LSB)
+
+#define IW_F2_B_LSB 11
+#define IW_F2_B_SIZE 5
+#define IW_F2_B_UNSHIFTED_MASK (0xffffffffu >> (32 - IW_F2_B_SIZE))
+#define IW_F2_B_SHIFTED_MASK (IW_F2_B_UNSHIFTED_MASK << IW_F2_B_LSB)
+#define GET_IW_F2_B(W) (((W) >> IW_F2_B_LSB) & IW_F2_B_UNSHIFTED_MASK)
+#define SET_IW_F2_B(V) (((V) & IW_F2_B_UNSHIFTED_MASK) << IW_F2_B_LSB)
+
+/* R2 opcodes.  */
+#define R2_OP_CALL 0
+#define R2_OP_AS_N 1
+#define R2_OP_BR 2
+#define R2_OP_BR_N 3
+#define R2_OP_ADDI 4
+#define R2_OP_LDBU_N 5
+#define R2_OP_LDBU 6
+#define R2_OP_LDB 7
+#define R2_OP_JMPI 8
+#define R2_OP_R_N 9
+#define R2_OP_ANDI_N 11
+#define R2_OP_ANDI 12
+#define R2_OP_LDHU_N 13
+#define R2_OP_LDHU 14
+#define R2_OP_LDH 15
+#define R2_OP_ASI_N 17
+#define R2_OP_BGE 18
+#define R2_OP_LDWSP_N 19
+#define R2_OP_ORI 20
+#define R2_OP_LDW_N 21
+#define R2_OP_CMPGEI 22
+#define R2_OP_LDW 23
+#define R2_OP_SHI_N 25
+#define R2_OP_BLT 26
+#define R2_OP_MOVI_N 27
+#define R2_OP_XORI 28
+#define R2_OP_STZ_N 29
+#define R2_OP_CMPLTI 30
+#define R2_OP_ANDCI 31
+#define R2_OP_OPX 32
+#define R2_OP_PP_N 33
+#define R2_OP_BNE 34
+#define R2_OP_BNEZ_N 35
+#define R2_OP_MULI 36
+#define R2_OP_STB_N 37
+#define R2_OP_CMPNEI 38
+#define R2_OP_STB 39
+#define R2_OP_I12 40
+#define R2_OP_SPI_N 41
+#define R2_OP_BEQ 42
+#define R2_OP_BEQZ_N 43
+#define R2_OP_ANDHI 44
+#define R2_OP_STH_N 45
+#define R2_OP_CMPEQI 46
+#define R2_OP_STH 47
+#define R2_OP_CUSTOM 48
+#define R2_OP_BGEU 50
+#define R2_OP_STWSP_N 51
+#define R2_OP_ORHI 52
+#define R2_OP_STW_N 53
+#define R2_OP_CMPGEUI 54
+#define R2_OP_STW 55
+#define R2_OP_BLTU 58
+#define R2_OP_MOV_N 59
+#define R2_OP_XORHI 60
+#define R2_OP_SPADDI_N 61
+#define R2_OP_CMPLTUI 62
+#define R2_OP_ANDCHI 63
+
+#define R2_OPX_WRPIE 0
+#define R2_OPX_ERET 1
+#define R2_OPX_ROLI 2
+#define R2_OPX_ROL 3
+#define R2_OPX_FLUSHP 4
+#define R2_OPX_RET 5
+#define R2_OPX_NOR 6
+#define R2_OPX_MULXUU 7
+#define R2_OPX_ENI 8
+#define R2_OPX_BRET 9
+#define R2_OPX_ROR 11
+#define R2_OPX_FLUSHI 12
+#define R2_OPX_JMP 13
+#define R2_OPX_AND 14
+#define R2_OPX_CMPGE 16
+#define R2_OPX_SLLI 18
+#define R2_OPX_SLL 19
+#define R2_OPX_WRPRS 20
+#define R2_OPX_OR 22
+#define R2_OPX_MULXSU 23
+#define R2_OPX_CMPLT 24
+#define R2_OPX_SRLI 26
+#define R2_OPX_SRL 27
+#define R2_OPX_NEXTPC 28
+#define R2_OPX_CALLR 29
+#define R2_OPX_XOR 30
+#define R2_OPX_MULXSS 31
+#define R2_OPX_CMPNE 32
+#define R2_OPX_INSERT 35
+#define R2_OPX_DIVU 36
+#define R2_OPX_DIV 37
+#define R2_OPX_RDCTL 38
+#define R2_OPX_MUL 39
+#define R2_OPX_CMPEQ 40
+#define R2_OPX_INITI 41
+#define R2_OPX_MERGE 43
+#define R2_OPX_HBREAK 44
+#define R2_OPX_TRAP 45
+#define R2_OPX_WRCTL 46
+#define R2_OPX_CMPGEU 48
+#define R2_OPX_ADD 49
+#define R2_OPX_EXTRACT 51
+#define R2_OPX_BREAK 52
+#define R2_OPX_LDEX 53
+#define R2_OPX_SYNC 54
+#define R2_OPX_LDSEX 55
+#define R2_OPX_CMPLTU 56
+#define R2_OPX_SUB 57
+#define R2_OPX_SRAI 58
+#define R2_OPX_SRA 59
+#define R2_OPX_STEX 61
+#define R2_OPX_STSEX 63
+
+#define R2_I12_LDBIO 0
+#define R2_I12_STBIO 1
+#define R2_I12_LDBUIO 2
+#define R2_I12_DCACHE 3
+#define R2_I12_LDHIO 4
+#define R2_I12_STHIO 5
+#define R2_I12_LDHUIO 6
+#define R2_I12_RDPRS 7
+#define R2_I12_LDWIO 8
+#define R2_I12_STWIO 9
+#define R2_I12_LDWM 12
+#define R2_I12_STWM 13
+
+#define R2_DCACHE_INITD 0
+#define R2_DCACHE_INITDA 1
+#define R2_DCACHE_FLUSHD 2
+#define R2_DCACHE_FLUSHDA 3
+
+#define R2_AS_N_ADD_N 0
+#define R2_AS_N_SUB_N 1
+
+#define R2_R_N_AND_N 0
+#define R2_R_N_OR_N 2
+#define R2_R_N_XOR_N 3
+#define R2_R_N_SLL_N 4
+#define R2_R_N_SRL_N 5
+#define R2_R_N_NOT_N 6
+#define R2_R_N_NEG_N 7
+#define R2_R_N_CALLR_N 8
+#define R2_R_N_JMPR_N 10
+#define R2_R_N_BREAK_N 12
+#define R2_R_N_TRAP_N 13
+#define R2_R_N_RET_N 14
+
+#define R2_SPI_N_SPINCI_N 0
+#define R2_SPI_N_SPDECI_N 1
+
+#define R2_ASI_N_ADDI_N 0
+#define R2_ASI_N_SUBI_N 1
+
+#define R2_SHI_N_SLLI_N 0
+#define R2_SHI_N_SRLI_N 1
+
+#define R2_PP_N_POP_N 0
+#define R2_PP_N_PUSH_N 1
+
+#define R2_STZ_N_STWZ_N 0
+#define R2_STZ_N_STBZ_N 1
+
+/* Convenience macros for R2 encodings. */
+
+#define MATCH_R2_OP(NAME) \
+  (SET_IW_R2_OP (R2_OP_##NAME))
+#define MASK_R2_OP \
+  IW_R2_OP_SHIFTED_MASK
+
+#define MATCH_R2_OPX0(NAME) \
+  (SET_IW_R2_OP (R2_OP_OPX) | SET_IW_OPX_X (R2_OPX_##NAME))
+#define MASK_R2_OPX0 \
+  (IW_R2_OP_SHIFTED_MASK | IW_OPX_X_SHIFTED_MASK \
+   | IW_F3X6L5_IMM5_SHIFTED_MASK)
+
+#define MATCH_R2_OPX(NAME, A, B, C)				\
+  (MATCH_R2_OPX0 (NAME) | SET_IW_F3X6L5_A (A) | SET_IW_F3X6L5_B (B) \
+   | SET_IW_F3X6L5_C (C))
+#define MASK_R2_OPX(A, B, C, N)				\
+  (IW_R2_OP_SHIFTED_MASK | IW_OPX_X_SHIFTED_MASK	\
+   | (A ? IW_F3X6L5_A_SHIFTED_MASK : 0)			\
+   | (B ? IW_F3X6L5_B_SHIFTED_MASK : 0)			\
+   | (C ? IW_F3X6L5_C_SHIFTED_MASK : 0)			\
+   | (N ? IW_F3X6L5_IMM5_SHIFTED_MASK : 0))
+
+#define MATCH_R2_I12(NAME) \
+  (SET_IW_R2_OP (R2_OP_I12) | SET_IW_I12_X (R2_I12_##NAME))
+#define MASK_R2_I12 \
+  (IW_R2_OP_SHIFTED_MASK | IW_I12_X_SHIFTED_MASK )
+
+#define MATCH_R2_DCACHE(NAME) \
+  (MATCH_R2_I12(DCACHE) | SET_IW_F1X4I12_X (R2_DCACHE_##NAME))
+#define MASK_R2_DCACHE \
+  (MASK_R2_I12 | IW_F1X4I12_X_SHIFTED_MASK)
+
+#define MATCH_R2_R_N(NAME) \
+  (SET_IW_R2_OP (R2_OP_R_N) | SET_IW_R_N_X (R2_R_N_##NAME))
+#define MASK_R2_R_N \
+  (IW_R2_OP_SHIFTED_MASK | IW_R_N_X_SHIFTED_MASK )
+
+/* Match/mask macros for R2 instructions.  */
+
+#define MATCH_R2_ADD	MATCH_R2_OPX0 (ADD)
+#define MASK_R2_ADD	MASK_R2_OPX0
+#define MATCH_R2_ADDI	MATCH_R2_OP (ADDI)
+#define MASK_R2_ADDI	MASK_R2_OP
+#define MATCH_R2_ADD_N	(MATCH_R2_OP (AS_N) | SET_IW_T3X1_X (R2_AS_N_ADD_N))
+#define MASK_R2_ADD_N	(MASK_R2_OP | IW_T3X1_X_SHIFTED_MASK)
+#define MATCH_R2_ADDI_N	(MATCH_R2_OP (ASI_N) | SET_IW_T2X1I3_X (R2_ASI_N_ADDI_N))
+#define MASK_R2_ADDI_N	(MASK_R2_OP | IW_T2X1I3_X_SHIFTED_MASK)
+#define MATCH_R2_AND	MATCH_R2_OPX0 (AND)
+#define MASK_R2_AND	MASK_R2_OPX0
+#define MATCH_R2_ANDCHI	MATCH_R2_OP (ANDCHI)
+#define MASK_R2_ANDCHI	MASK_R2_OP
+#define MATCH_R2_ANDCI	MATCH_R2_OP (ANDCI)
+#define MASK_R2_ANDCI	MASK_R2_OP
+#define MATCH_R2_ANDHI	MATCH_R2_OP (ANDHI)
+#define MASK_R2_ANDHI	MASK_R2_OP
+#define MATCH_R2_ANDI	MATCH_R2_OP (ANDI)
+#define MASK_R2_ANDI	MASK_R2_OP
+#define MATCH_R2_ANDI_N	MATCH_R2_OP (ANDI_N)
+#define MASK_R2_ANDI_N	MASK_R2_OP
+#define MATCH_R2_AND_N	MATCH_R2_R_N (AND_N)
+#define MASK_R2_AND_N	MASK_R2_R_N
+#define MATCH_R2_BEQ	MATCH_R2_OP (BEQ)
+#define MASK_R2_BEQ	MASK_R2_OP
+#define MATCH_R2_BEQZ_N	MATCH_R2_OP (BEQZ_N)
+#define MASK_R2_BEQZ_N	MASK_R2_OP
+#define MATCH_R2_BGE	MATCH_R2_OP (BGE)
+#define MASK_R2_BGE	MASK_R2_OP
+#define MATCH_R2_BGEU	MATCH_R2_OP (BGEU)
+#define MASK_R2_BGEU	MASK_R2_OP
+#define MATCH_R2_BGT	MATCH_R2_OP (BLT)
+#define MASK_R2_BGT	MASK_R2_OP
+#define MATCH_R2_BGTU	MATCH_R2_OP (BLTU)
+#define MASK_R2_BGTU	MASK_R2_OP
+#define MATCH_R2_BLE	MATCH_R2_OP (BGE)
+#define MASK_R2_BLE	MASK_R2_OP
+#define MATCH_R2_BLEU	MATCH_R2_OP (BGEU)
+#define MASK_R2_BLEU	MASK_R2_OP
+#define MATCH_R2_BLT	MATCH_R2_OP (BLT)
+#define MASK_R2_BLT	MASK_R2_OP
+#define MATCH_R2_BLTU	MATCH_R2_OP (BLTU)
+#define MASK_R2_BLTU	MASK_R2_OP
+#define MATCH_R2_BNE	MATCH_R2_OP (BNE)
+#define MASK_R2_BNE	MASK_R2_OP
+#define MATCH_R2_BNEZ_N	MATCH_R2_OP (BNEZ_N)
+#define MASK_R2_BNEZ_N	MASK_R2_OP
+#define MATCH_R2_BR	MATCH_R2_OP (BR)
+#define MASK_R2_BR	MASK_R2_OP | IW_F2I16_A_SHIFTED_MASK | IW_F2I16_B_SHIFTED_MASK
+#define MATCH_R2_BREAK	MATCH_R2_OPX (BREAK, 0, 0, 0x1e)
+#define MASK_R2_BREAK	MASK_R2_OPX (1, 1, 1, 0)
+#define MATCH_R2_BREAK_N	MATCH_R2_R_N (BREAK_N)
+#define MASK_R2_BREAK_N	MASK_R2_R_N
+#define MATCH_R2_BRET	MATCH_R2_OPX (BRET, 0x1e, 0, 0)
+#define MASK_R2_BRET	MASK_R2_OPX (1, 1, 1, 1)
+#define MATCH_R2_BR_N	MATCH_R2_OP (BR_N)
+#define MASK_R2_BR_N	MASK_R2_OP
+#define MATCH_R2_CALL	MATCH_R2_OP (CALL)
+#define MASK_R2_CALL	MASK_R2_OP
+#define MATCH_R2_CALLR	MATCH_R2_OPX (CALLR, 0, 0, 0x1f)
+#define MASK_R2_CALLR	MASK_R2_OPX (0, 1, 1, 1)
+#define MATCH_R2_CALLR_N	MATCH_R2_R_N (CALLR_N)
+#define MASK_R2_CALLR_N	MASK_R2_R_N
+#define MATCH_R2_CMPEQ	MATCH_R2_OPX0 (CMPEQ)
+#define MASK_R2_CMPEQ	MASK_R2_OPX0
+#define MATCH_R2_CMPEQI	MATCH_R2_OP (CMPEQI)
+#define MASK_R2_CMPEQI	MASK_R2_OP
+#define MATCH_R2_CMPGE	MATCH_R2_OPX0 (CMPGE)
+#define MASK_R2_CMPGE	MASK_R2_OPX0
+#define MATCH_R2_CMPGEI	MATCH_R2_OP (CMPGEI)
+#define MASK_R2_CMPGEI	MASK_R2_OP
+#define MATCH_R2_CMPGEU	MATCH_R2_OPX0 (CMPGEU)
+#define MASK_R2_CMPGEU	MASK_R2_OPX0
+#define MATCH_R2_CMPGEUI	MATCH_R2_OP (CMPGEUI)
+#define MASK_R2_CMPGEUI	MASK_R2_OP
+#define MATCH_R2_CMPGT	MATCH_R2_OPX0 (CMPLT)
+#define MASK_R2_CMPGT	MASK_R2_OPX0
+#define MATCH_R2_CMPGTI	MATCH_R2_OP (CMPGEI)
+#define MASK_R2_CMPGTI	MASK_R2_OP
+#define MATCH_R2_CMPGTU	MATCH_R2_OPX0 (CMPLTU)
+#define MASK_R2_CMPGTU	MASK_R2_OPX0
+#define MATCH_R2_CMPGTUI	MATCH_R2_OP (CMPGEUI)
+#define MASK_R2_CMPGTUI	MASK_R2_OP
+#define MATCH_R2_CMPLE	MATCH_R2_OPX0 (CMPGE)
+#define MASK_R2_CMPLE	MASK_R2_OPX0
+#define MATCH_R2_CMPLEI	MATCH_R2_OP (CMPLTI)
+#define MASK_R2_CMPLEI	MASK_R2_OP
+#define MATCH_R2_CMPLEU	MATCH_R2_OPX0 (CMPGEU)
+#define MASK_R2_CMPLEU	MASK_R2_OPX0
+#define MATCH_R2_CMPLEUI	MATCH_R2_OP (CMPLTUI)
+#define MASK_R2_CMPLEUI	MASK_R2_OP
+#define MATCH_R2_CMPLT	MATCH_R2_OPX0 (CMPLT)
+#define MASK_R2_CMPLT	MASK_R2_OPX0
+#define MATCH_R2_CMPLTI	MATCH_R2_OP (CMPLTI)
+#define MASK_R2_CMPLTI	MASK_R2_OP
+#define MATCH_R2_CMPLTU	MATCH_R2_OPX0 (CMPLTU)
+#define MASK_R2_CMPLTU	MASK_R2_OPX0
+#define MATCH_R2_CMPLTUI	MATCH_R2_OP (CMPLTUI)
+#define MASK_R2_CMPLTUI	MASK_R2_OP
+#define MATCH_R2_CMPNE	MATCH_R2_OPX0 (CMPNE)
+#define MASK_R2_CMPNE	MASK_R2_OPX0
+#define MATCH_R2_CMPNEI	MATCH_R2_OP (CMPNEI)
+#define MASK_R2_CMPNEI	MASK_R2_OP
+#define MATCH_R2_CUSTOM	MATCH_R2_OP (CUSTOM)
+#define MASK_R2_CUSTOM	MASK_R2_OP
+#define MATCH_R2_DIV	MATCH_R2_OPX0 (DIV)
+#define MASK_R2_DIV	MASK_R2_OPX0
+#define MATCH_R2_DIVU	MATCH_R2_OPX0 (DIVU)
+#define MASK_R2_DIVU	MASK_R2_OPX0
+#define MATCH_R2_ENI	MATCH_R2_OPX (ENI, 0, 0, 0)
+#define MASK_R2_ENI	MASK_R2_OPX (1, 1, 1, 0)
+#define MATCH_R2_ERET	MATCH_R2_OPX (ERET, 0x1d, 0x1e, 0)
+#define MASK_R2_ERET	MASK_R2_OPX (1, 1, 1, 1)
+#define MATCH_R2_EXTRACT	MATCH_R2_OPX (EXTRACT, 0, 0, 0)
+#define MASK_R2_EXTRACT	MASK_R2_OPX (0, 0, 0, 0)
+#define MATCH_R2_FLUSHD	MATCH_R2_DCACHE (FLUSHD)
+#define MASK_R2_FLUSHD	MASK_R2_DCACHE
+#define MATCH_R2_FLUSHDA	MATCH_R2_DCACHE (FLUSHDA)
+#define MASK_R2_FLUSHDA	MASK_R2_DCACHE
+#define MATCH_R2_FLUSHI	MATCH_R2_OPX (FLUSHI, 0, 0, 0)
+#define MASK_R2_FLUSHI	MASK_R2_OPX (0, 1, 1, 1)
+#define MATCH_R2_FLUSHP	MATCH_R2_OPX (FLUSHP, 0, 0, 0)
+#define MASK_R2_FLUSHP	MASK_R2_OPX (1, 1, 1, 1)
+#define MATCH_R2_INITD	MATCH_R2_DCACHE (INITD)
+#define MASK_R2_INITD	MASK_R2_DCACHE
+#define MATCH_R2_INITDA	MATCH_R2_DCACHE (INITDA)
+#define MASK_R2_INITDA	MASK_R2_DCACHE
+#define MATCH_R2_INITI	MATCH_R2_OPX (INITI, 0, 0, 0)
+#define MASK_R2_INITI	MASK_R2_OPX (0, 1, 1, 1)
+#define MATCH_R2_INSERT	MATCH_R2_OPX (INSERT, 0, 0, 0)
+#define MASK_R2_INSERT	MASK_R2_OPX (0, 0, 0, 0)
+#define MATCH_R2_JMP	MATCH_R2_OPX (JMP, 0, 0, 0)
+#define MASK_R2_JMP	MASK_R2_OPX (0, 1, 1, 1)
+#define MATCH_R2_JMPI	MATCH_R2_OP (JMPI)
+#define MASK_R2_JMPI	MASK_R2_OP
+#define MATCH_R2_JMPR_N	MATCH_R2_R_N (JMPR_N)
+#define MASK_R2_JMPR_N	MASK_R2_R_N
+#define MATCH_R2_LDB	MATCH_R2_OP (LDB)
+#define MASK_R2_LDB	MASK_R2_OP
+#define MATCH_R2_LDBIO	MATCH_R2_I12 (LDBIO)
+#define MASK_R2_LDBIO	MASK_R2_I12
+#define MATCH_R2_LDBU	MATCH_R2_OP (LDBU)
+#define MASK_R2_LDBU	MASK_R2_OP
+#define MATCH_R2_LDBUIO	MATCH_R2_I12 (LDBUIO)
+#define MASK_R2_LDBUIO	MASK_R2_I12
+#define MATCH_R2_LDBU_N	MATCH_R2_OP (LDBU_N)
+#define MASK_R2_LDBU_N	MASK_R2_OP
+#define MATCH_R2_LDEX	MATCH_R2_OPX (LDEX, 0, 0, 0)
+#define MASK_R2_LDEX	MASK_R2_OPX (0, 1, 0, 1)
+#define MATCH_R2_LDH	MATCH_R2_OP (LDH)
+#define MASK_R2_LDH	MASK_R2_OP
+#define MATCH_R2_LDHIO	MATCH_R2_I12 (LDHIO)
+#define MASK_R2_LDHIO	MASK_R2_I12
+#define MATCH_R2_LDHU	MATCH_R2_OP (LDHU)
+#define MASK_R2_LDHU	MASK_R2_OP
+#define MATCH_R2_LDHUIO	MATCH_R2_I12 (LDHUIO)
+#define MASK_R2_LDHUIO	MASK_R2_I12
+#define MATCH_R2_LDHU_N	MATCH_R2_OP (LDHU_N)
+#define MASK_R2_LDHU_N	MASK_R2_OP
+#define MATCH_R2_LDSEX	MATCH_R2_OPX (LDSEX, 0, 0, 0)
+#define MASK_R2_LDSEX	MASK_R2_OPX (0, 1, 0, 1)
+#define MATCH_R2_LDW	MATCH_R2_OP (LDW)
+#define MASK_R2_LDW	MASK_R2_OP
+#define MATCH_R2_LDWIO	MATCH_R2_I12 (LDWIO)
+#define MASK_R2_LDWIO	MASK_R2_I12
+#define MATCH_R2_LDWM	MATCH_R2_I12 (LDWM)
+#define MASK_R2_LDWM	MASK_R2_I12
+#define MATCH_R2_LDWSP_N	MATCH_R2_OP (LDWSP_N)
+#define MASK_R2_LDWSP_N	MASK_R2_OP
+#define MATCH_R2_LDW_N	MATCH_R2_OP (LDW_N)
+#define MASK_R2_LDW_N	MASK_R2_OP
+#define MATCH_R2_MERGE	MATCH_R2_OPX (MERGE, 0, 0, 0)
+#define MASK_R2_MERGE	MASK_R2_OPX (0, 0, 0, 0)
+#define MATCH_R2_MOV	MATCH_R2_OPX (ADD, 0, 0, 0)
+#define MASK_R2_MOV	MASK_R2_OPX (0, 1, 0, 1)
+#define MATCH_R2_MOVHI	MATCH_R2_OP (ORHI) | SET_IW_F2I16_A (0)
+#define MASK_R2_MOVHI	MASK_R2_OP | IW_F2I16_A_SHIFTED_MASK
+#define MATCH_R2_MOVI	MATCH_R2_OP (ADDI) | SET_IW_F2I16_A (0)
+#define MASK_R2_MOVI	MASK_R2_OP | IW_F2I16_A_SHIFTED_MASK
+#define MATCH_R2_MOVUI	MATCH_R2_OP (ORI) | SET_IW_F2I16_A (0)
+#define MASK_R2_MOVUI	MASK_R2_OP | IW_F2I16_A_SHIFTED_MASK
+#define MATCH_R2_MOV_N	MATCH_R2_OP (MOV_N)
+#define MASK_R2_MOV_N	MASK_R2_OP
+#define MATCH_R2_MOVI_N	MATCH_R2_OP (MOVI_N)
+#define MASK_R2_MOVI_N	MASK_R2_OP
+#define MATCH_R2_MUL	MATCH_R2_OPX0 (MUL)
+#define MASK_R2_MUL	MASK_R2_OPX0
+#define MATCH_R2_MULI	MATCH_R2_OP (MULI)
+#define MASK_R2_MULI	MASK_R2_OP
+#define MATCH_R2_MULXSS	MATCH_R2_OPX0 (MULXSS)
+#define MASK_R2_MULXSS	MASK_R2_OPX0
+#define MATCH_R2_MULXSU	MATCH_R2_OPX0 (MULXSU)
+#define MASK_R2_MULXSU	MASK_R2_OPX0
+#define MATCH_R2_MULXUU	MATCH_R2_OPX0 (MULXUU)
+#define MASK_R2_MULXUU	MASK_R2_OPX0
+#define MATCH_R2_NEG_N	MATCH_R2_R_N (NEG_N)
+#define MASK_R2_NEG_N	MASK_R2_R_N
+#define MATCH_R2_NEXTPC	MATCH_R2_OPX (NEXTPC, 0, 0, 0)
+#define MASK_R2_NEXTPC	MASK_R2_OPX (1, 1, 0, 1)
+#define MATCH_R2_NOP	MATCH_R2_OPX (ADD, 0, 0, 0)
+#define MASK_R2_NOP	MASK_R2_OPX (1, 1, 1, 1)
+#define MATCH_R2_NOP_N	(MATCH_R2_OP (MOV_N) | SET_IW_F2_A (0) | SET_IW_F2_B (0))
+#define MASK_R2_NOP_N	(MASK_R2_OP | IW_F2_A_SHIFTED_MASK | IW_F2_B_SHIFTED_MASK)
+#define MATCH_R2_NOR	MATCH_R2_OPX0 (NOR)
+#define MASK_R2_NOR	MASK_R2_OPX0
+#define MATCH_R2_NOT_N	MATCH_R2_R_N (NOT_N)
+#define MASK_R2_NOT_N	MASK_R2_R_N
+#define MATCH_R2_OR	MATCH_R2_OPX0 (OR)
+#define MASK_R2_OR	MASK_R2_OPX0
+#define MATCH_R2_OR_N	MATCH_R2_R_N (OR_N)
+#define MASK_R2_OR_N	MASK_R2_R_N
+#define MATCH_R2_ORHI	MATCH_R2_OP (ORHI)
+#define MASK_R2_ORHI	MASK_R2_OP
+#define MATCH_R2_ORI	MATCH_R2_OP (ORI)
+#define MASK_R2_ORI	MASK_R2_OP
+#define MATCH_R2_POP_N	(MATCH_R2_OP (PP_N) | SET_IW_L5I4X1_X (R2_PP_N_POP_N))
+#define MASK_R2_POP_N	(MASK_R2_OP | IW_L5I4X1_X_SHIFTED_MASK)
+#define MATCH_R2_PUSH_N	(MATCH_R2_OP (PP_N) | SET_IW_L5I4X1_X (R2_PP_N_PUSH_N))
+#define MASK_R2_PUSH_N	(MASK_R2_OP | IW_L5I4X1_X_SHIFTED_MASK)
+#define MATCH_R2_RDCTL	MATCH_R2_OPX (RDCTL, 0, 0, 0)
+#define MASK_R2_RDCTL	MASK_R2_OPX (1, 1, 0, 0)
+#define MATCH_R2_RDPRS	MATCH_R2_I12 (RDPRS)
+#define MASK_R2_RDPRS	MASK_R2_I12
+#define MATCH_R2_RET	MATCH_R2_OPX (RET, 0x1f, 0, 0)
+#define MASK_R2_RET	MASK_R2_OPX (1, 1, 1, 1)
+#define MATCH_R2_RET_N	(MATCH_R2_R_N (RET_N) | SET_IW_X2L5_IMM5 (0))
+#define MASK_R2_RET_N	(MASK_R2_R_N | IW_X2L5_IMM5_SHIFTED_MASK)
+#define MATCH_R2_ROL	MATCH_R2_OPX0 (ROL)
+#define MASK_R2_ROL	MASK_R2_OPX0
+#define MATCH_R2_ROLI	MATCH_R2_OPX (ROLI, 0, 0, 0)
+#define MASK_R2_ROLI	MASK_R2_OPX (0, 1, 0, 0)
+#define MATCH_R2_ROR	MATCH_R2_OPX0 (ROR)
+#define MASK_R2_ROR	MASK_R2_OPX0
+#define MATCH_R2_SLL	MATCH_R2_OPX0 (SLL)
+#define MASK_R2_SLL	MASK_R2_OPX0
+#define MATCH_R2_SLLI	MATCH_R2_OPX (SLLI, 0, 0, 0)
+#define MASK_R2_SLLI	MASK_R2_OPX (0, 1, 0, 0)
+#define MATCH_R2_SLL_N	MATCH_R2_R_N (SLL_N)
+#define MASK_R2_SLL_N	MASK_R2_R_N
+#define MATCH_R2_SLLI_N	(MATCH_R2_OP (SHI_N) | SET_IW_T2X1L3_X (R2_SHI_N_SLLI_N))
+#define MASK_R2_SLLI_N	(MASK_R2_OP | IW_T2X1L3_X_SHIFTED_MASK)
+#define MATCH_R2_SPADDI_N	MATCH_R2_OP (SPADDI_N)
+#define MASK_R2_SPADDI_N	MASK_R2_OP
+#define MATCH_R2_SPDECI_N	(MATCH_R2_OP (SPI_N) | SET_IW_X1I7_X (R2_SPI_N_SPDECI_N))
+#define MASK_R2_SPDECI_N	(MASK_R2_OP | IW_X1I7_X_SHIFTED_MASK)
+#define MATCH_R2_SPINCI_N	(MATCH_R2_OP (SPI_N) | SET_IW_X1I7_X (R2_SPI_N_SPINCI_N))
+#define MASK_R2_SPINCI_N	(MASK_R2_OP | IW_X1I7_X_SHIFTED_MASK)
+#define MATCH_R2_SRA	MATCH_R2_OPX0 (SRA)
+#define MASK_R2_SRA	MASK_R2_OPX0
+#define MATCH_R2_SRAI	MATCH_R2_OPX (SRAI, 0, 0, 0)
+#define MASK_R2_SRAI	MASK_R2_OPX (0, 1, 0, 0)
+#define MATCH_R2_SRL	MATCH_R2_OPX0 (SRL)
+#define MASK_R2_SRL	MASK_R2_OPX0
+#define MATCH_R2_SRLI	MATCH_R2_OPX (SRLI, 0, 0, 0)
+#define MASK_R2_SRLI	MASK_R2_OPX (0, 1, 0, 0)
+#define MATCH_R2_SRL_N	MATCH_R2_R_N (SRL_N)
+#define MASK_R2_SRL_N	MASK_R2_R_N
+#define MATCH_R2_SRLI_N	(MATCH_R2_OP (SHI_N) | SET_IW_T2X1L3_X (R2_SHI_N_SRLI_N))
+#define MASK_R2_SRLI_N	(MASK_R2_OP | IW_T2X1L3_X_SHIFTED_MASK)
+#define MATCH_R2_STB	MATCH_R2_OP (STB)
+#define MASK_R2_STB	MASK_R2_OP
+#define MATCH_R2_STBIO	MATCH_R2_I12 (STBIO)
+#define MASK_R2_STBIO	MASK_R2_I12
+#define MATCH_R2_STB_N	MATCH_R2_OP (STB_N)
+#define MASK_R2_STB_N	MASK_R2_OP
+#define MATCH_R2_STBZ_N	(MATCH_R2_OP (STZ_N) | SET_IW_T1X1I6_X (R2_STZ_N_STBZ_N))
+#define MASK_R2_STBZ_N	(MASK_R2_OP | IW_T1X1I6_X_SHIFTED_MASK)
+#define MATCH_R2_STEX	MATCH_R2_OPX0 (STEX)
+#define MASK_R2_STEX	MASK_R2_OPX0
+#define MATCH_R2_STH	MATCH_R2_OP (STH)
+#define MASK_R2_STH	MASK_R2_OP
+#define MATCH_R2_STHIO	MATCH_R2_I12 (STHIO)
+#define MASK_R2_STHIO	MASK_R2_I12
+#define MATCH_R2_STH_N	MATCH_R2_OP (STH_N)
+#define MASK_R2_STH_N	MASK_R2_OP
+#define MATCH_R2_STSEX	MATCH_R2_OPX0 (STSEX)
+#define MASK_R2_STSEX	MASK_R2_OPX0
+#define MATCH_R2_STW	MATCH_R2_OP (STW)
+#define MASK_R2_STW	MASK_R2_OP
+#define MATCH_R2_STWIO	MATCH_R2_I12 (STWIO)
+#define MASK_R2_STWIO	MASK_R2_I12
+#define MATCH_R2_STWM	MATCH_R2_I12 (STWM)
+#define MASK_R2_STWM	MASK_R2_I12
+#define MATCH_R2_STWSP_N	MATCH_R2_OP (STWSP_N)
+#define MASK_R2_STWSP_N	MASK_R2_OP
+#define MATCH_R2_STW_N	MATCH_R2_OP (STW_N)
+#define MASK_R2_STW_N	MASK_R2_OP
+#define MATCH_R2_STWZ_N	MATCH_R2_OP (STZ_N)
+#define MASK_R2_STWZ_N	MASK_R2_OP
+#define MATCH_R2_SUB	MATCH_R2_OPX0 (SUB)
+#define MASK_R2_SUB	MASK_R2_OPX0
+#define MATCH_R2_SUBI	MATCH_R2_OP (ADDI)
+#define MASK_R2_SUBI	MASK_R2_OP
+#define MATCH_R2_SUB_N	(MATCH_R2_OP (AS_N) | SET_IW_T3X1_X (R2_AS_N_SUB_N))
+#define MASK_R2_SUB_N	(MASK_R2_OP | IW_T3X1_X_SHIFTED_MASK)
+#define MATCH_R2_SUBI_N	(MATCH_R2_OP (ASI_N) | SET_IW_T2X1I3_X (R2_ASI_N_SUBI_N))
+#define MASK_R2_SUBI_N	(MASK_R2_OP | IW_T2X1I3_X_SHIFTED_MASK)
+#define MATCH_R2_SYNC	MATCH_R2_OPX (SYNC, 0, 0, 0)
+#define MASK_R2_SYNC	MASK_R2_OPX (1, 1, 1, 1)
+#define MATCH_R2_TRAP	MATCH_R2_OPX (TRAP, 0, 0, 0x1d)
+#define MASK_R2_TRAP	MASK_R2_OPX (1, 1, 1, 0)
+#define MATCH_R2_TRAP_N	MATCH_R2_R_N (TRAP_N)
+#define MASK_R2_TRAP_N	MASK_R2_R_N
+#define MATCH_R2_WRCTL	MATCH_R2_OPX (WRCTL, 0, 0, 0)
+#define MASK_R2_WRCTL	MASK_R2_OPX (0, 1, 1, 0)
+#define MATCH_R2_WRPIE	MATCH_R2_OPX (WRPIE, 0, 0, 0)
+#define MASK_R2_WRPIE	MASK_R2_OPX (0, 1, 0, 1)
+#define MATCH_R2_WRPRS	MATCH_R2_OPX (WRPRS, 0, 0, 0)
+#define MASK_R2_WRPRS	MASK_R2_OPX (0, 1, 0, 1)
+#define MATCH_R2_XOR	MATCH_R2_OPX0 (XOR)
+#define MASK_R2_XOR	MASK_R2_OPX0
+#define MATCH_R2_XORHI	MATCH_R2_OP (XORHI)
+#define MASK_R2_XORHI	MASK_R2_OP
+#define MATCH_R2_XORI	MATCH_R2_OP (XORI)
+#define MASK_R2_XORI	MASK_R2_OP
+#define MATCH_R2_XOR_N	MATCH_R2_R_N (XOR_N)
+#define MASK_R2_XOR_N	MASK_R2_R_N
+
+#endif /* _NIOS2R2_H */
+
+
diff --git a/opcodes/ChangeLog b/opcodes/ChangeLog
index 138536a5cf0..a3fbc43a2fc 100644
--- a/opcodes/ChangeLog
+++ b/opcodes/ChangeLog
@@ -1,3 +1,25 @@
+2015-07-01  Sandra Loosemore  <sandra@codesourcery.com>
+	    Cesar Philippidis  <cesar@codesourcery.com>
+
+	* nios2-dis.c (nios2_extract_opcode): New.
+	(nios2_disassembler_state): New.
+	(nios2_find_opcode_hash): Use mach parameter to select correct
+	disassembler state.
+	(nios2_print_insn_arg): Extend to support new R2 argument letters
+	and formats.
+	(print_insn_nios2): Check for 16-bit instruction at end of memory.
+	* nios2-opc.c (nios2_builtin_regs): Add R2 register attributes.
+	(NIOS2_NUM_OPCODES): Rename to...
+	(NIOS2_NUM_R1_OPCODES): This.
+	(nios2_r2_opcodes): New.
+	(NIOS2_NUM_R2_OPCODES): New.
+	(nios2_num_r2_opcodes): New.
+	(nios2_r2_asi_n_mappings, nios2_num_r2_asi_n_mappings): New.
+	(nios2_r2_shi_n_mappings, nios2_num_r2_shi_n_mappings): New.
+	(nios2_r2_andi_n_mappings, nios2_num_r2_andi_n_mappings): New.
+	(nios2_r2_reg3_mappings, nios2_num_r2_reg3_mappings): New.
+	(nios2_r2_reg_range_mappings, nios2_num_r2_reg_range_mappings):	New.
+
 2015-06-30  Amit Pawar  <Amit.Pawar@amd.com>
 
 	* i386-dis.c (OP_Mwaitx): New.
diff --git a/opcodes/nios2-dis.c b/opcodes/nios2-dis.c
index 80951f11886..2735aad50b7 100644
--- a/opcodes/nios2-dis.c
+++ b/opcodes/nios2-dis.c
@@ -55,7 +55,14 @@ nios2_r1_extract_opcode (unsigned int x)
   return GET_IW_R1_OP (x);
 }
 
-/* Pseudo-ops are stored in a different table than regular instructions.  */
+static unsigned int
+nios2_r2_extract_opcode (unsigned int x)
+{
+  return GET_IW_R2_OP (x);
+}
+
+/* We maintain separate hash tables for R1 and R2 opcodes, and pseudo-ops
+   are stored in a different table than regular instructions.  */
 
 typedef struct _nios2_disassembler_state
 {
@@ -79,6 +86,17 @@ nios2_r1_disassembler_state = {
   0
 };
 
+static nios2_disassembler_state
+nios2_r2_disassembler_state = {
+  nios2_r2_opcodes,
+  &nios2_num_r2_opcodes,
+  nios2_r2_extract_opcode,
+  {},
+  {},
+  NULL,
+  0
+};
+  
 /* Function to initialize the opcode hash table.  */
 static void
 nios2_init_opcode_hash (nios2_disassembler_state *state)
@@ -155,13 +173,17 @@ nios2_init_opcode_hash (nios2_disassembler_state *state)
 /* Return a pointer to an nios2_opcode struct for a given instruction
    word OPCODE for bfd machine MACH, or NULL if there is an error.  */
 const struct nios2_opcode *
-nios2_find_opcode_hash (unsigned long opcode,
-			unsigned long mach ATTRIBUTE_UNUSED)
+nios2_find_opcode_hash (unsigned long opcode, unsigned long mach)
 {
   nios2_opcode_hash *entry;
   nios2_disassembler_state *state;
 
-  state = &nios2_r1_disassembler_state;
+  /* Select the right instruction set, hash tables, and opcode accessor
+     for the mach variant.  */
+  if (mach == bfd_mach_nios2r2)
+    state = &nios2_r2_disassembler_state;
+  else
+    state = &nios2_r1_disassembler_state;
 
   /* Build a hash table to shorten the search time.  */
   if (!state->init)
@@ -260,19 +282,46 @@ nios2_print_insn_arg (const char *argptr,
       (*info->fprintf_func) (info->stream, "%c", *argptr);
       break;
 
+    case 'c':
+      /* Control register index.  */
+      switch (op->format)
+	{
+	case iw_r_type:
+	  i = GET_IW_R_IMM5 (opcode);
+	  break;
+	case iw_F3X6L5_type:
+	  i = GET_IW_F3X6L5_IMM5 (opcode);
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      reg_base = nios2_control_regs ();
+      (*info->fprintf_func) (info->stream, "%s", reg_base[i].name);
+      break;
+
     case 'd':
+      reg_base = nios2_regs;
       switch (op->format)
 	{
 	case iw_r_type:
 	  i = GET_IW_R_C (opcode);
-	  reg_base = nios2_regs;
 	  break;
 	case iw_custom_type:
 	  i = GET_IW_CUSTOM_C (opcode);
 	  if (GET_IW_CUSTOM_READC (opcode) == 0)
 	    reg_base = nios2_coprocessor_regs ();
-	  else
-	    reg_base = nios2_regs;
+	  break;
+	case iw_F3X6L5_type:
+	case iw_F3X6_type:
+	  i = GET_IW_F3X6L5_C (opcode);
+	  break;
+	case iw_F3X8_type:
+	  i = GET_IW_F3X8_C (opcode);
+	  if (GET_IW_F3X8_READC (opcode) == 0)
+	    reg_base = nios2_coprocessor_regs ();
+	  break;
+	case iw_F2_type:
+	  i = GET_IW_F2_B (opcode);
 	  break;
 	default:
 	  bad_opcode (op);
@@ -284,22 +333,52 @@ nios2_print_insn_arg (const char *argptr,
       break;
 
     case 's':
+      reg_base = nios2_regs;
       switch (op->format)
 	{
 	case iw_r_type:
 	  i = GET_IW_R_A (opcode);
-	  reg_base = nios2_regs;
 	  break;
 	case iw_i_type:
 	  i = GET_IW_I_A (opcode);
-	  reg_base = nios2_regs;
 	  break;
 	case iw_custom_type:
 	  i = GET_IW_CUSTOM_A (opcode);
 	  if (GET_IW_CUSTOM_READA (opcode) == 0)
 	    reg_base = nios2_coprocessor_regs ();
-	  else
-	    reg_base = nios2_regs;
+	  break;
+	case iw_F2I16_type:
+	  i = GET_IW_F2I16_A (opcode);
+	  break;
+	case iw_F2X4I12_type:
+	  i = GET_IW_F2X4I12_A (opcode);
+	  break;
+	case iw_F1X4I12_type:
+	  i = GET_IW_F1X4I12_A (opcode);
+	  break;
+	case iw_F1X4L17_type:
+	  i = GET_IW_F1X4L17_A (opcode);
+	  break;
+	case iw_F3X6L5_type:
+	case iw_F3X6_type:
+	  i = GET_IW_F3X6L5_A (opcode);
+	  break;
+	case iw_F2X6L10_type:
+	  i = GET_IW_F2X6L10_A (opcode);
+	  break;
+	case iw_F3X8_type:
+	  i = GET_IW_F3X8_A (opcode);
+	  if (GET_IW_F3X8_READA (opcode) == 0)
+	    reg_base = nios2_coprocessor_regs ();
+	  break;
+	case iw_F1X1_type:
+	  i = GET_IW_F1X1_A (opcode);
+	  break;
+	case iw_F1I5_type:
+	  i = 27;   /* Implicit stack pointer reference.  */
+	  break;
+	case iw_F2_type:
+	  i = GET_IW_F2_A (opcode);
 	  break;
 	default:
 	  bad_opcode (op);
@@ -311,22 +390,46 @@ nios2_print_insn_arg (const char *argptr,
       break;
 
     case 't':
+      reg_base = nios2_regs;
       switch (op->format)
 	{
 	case iw_r_type:
 	  i = GET_IW_R_B (opcode);
-	  reg_base = nios2_regs;
 	  break;
 	case iw_i_type:
 	  i = GET_IW_I_B (opcode);
-	  reg_base = nios2_regs;
 	  break;
 	case iw_custom_type:
 	  i = GET_IW_CUSTOM_B (opcode);
 	  if (GET_IW_CUSTOM_READB (opcode) == 0)
 	    reg_base = nios2_coprocessor_regs ();
-	  else
-	    reg_base = nios2_regs;
+	  break;
+	case iw_F2I16_type:
+	  i = GET_IW_F2I16_B (opcode);
+	  break;
+	case iw_F2X4I12_type:
+	  i = GET_IW_F2X4I12_B (opcode);
+	  break;
+	case iw_F3X6L5_type:
+	case iw_F3X6_type:
+	  i = GET_IW_F3X6L5_B (opcode);
+	  break;
+	case iw_F2X6L10_type:
+	  i = GET_IW_F2X6L10_B (opcode);
+	  break;
+	case iw_F3X8_type:
+	  i = GET_IW_F3X8_B (opcode);
+	  if (GET_IW_F3X8_READB (opcode) == 0)
+	    reg_base = nios2_coprocessor_regs ();
+	  break;
+	case iw_F1I5_type:
+	  i = GET_IW_F1I5_B (opcode);
+	  break;
+	case iw_F2_type:
+	  i = GET_IW_F2_B (opcode);
+	  break;
+	case iw_T1X1I6_type:
+	  i = 0;
 	  break;
 	default:
 	  bad_opcode (op);
@@ -337,6 +440,110 @@ nios2_print_insn_arg (const char *argptr,
 	(*info->fprintf_func) (info->stream, "unknown");
       break;
 
+    case 'D':
+      switch (op->format)
+	{
+	case iw_T1I7_type:
+	  i = GET_IW_T1I7_A3 (opcode);
+	  break;
+	case iw_T2X1L3_type:
+	  i = GET_IW_T2X1L3_B3 (opcode);
+	  break;
+	case iw_T2X1I3_type:
+	  i = GET_IW_T2X1I3_B3 (opcode);
+	  break;
+	case iw_T3X1_type:
+	  i = GET_IW_T3X1_C3 (opcode);
+	  break;
+	case iw_T2X3_type:
+	  if (op->num_args == 3)
+	    i = GET_IW_T2X3_A3 (opcode);
+	  else
+	    i = GET_IW_T2X3_B3 (opcode);
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      i = nios2_r2_reg3_mappings[i];
+      (*info->fprintf_func) (info->stream, "%s", nios2_regs[i].name);
+      break;
+
+    case 'M':
+      /* 6-bit unsigned immediate with no shift.  */
+      switch (op->format)
+	{
+	case iw_T1X1I6_type:
+	  i = GET_IW_T1X1I6_IMM6 (opcode);
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      (*info->fprintf_func) (info->stream, "%ld", i);
+      break;
+
+    case 'N':
+      /* 6-bit unsigned immediate with 2-bit shift.  */
+      switch (op->format)
+	{
+	case iw_T1X1I6_type:
+	  i = GET_IW_T1X1I6_IMM6 (opcode) << 2;
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      (*info->fprintf_func) (info->stream, "%ld", i);
+      break;
+
+    case 'S':
+      switch (op->format)
+	{
+	case iw_T1I7_type:
+	  i = GET_IW_T1I7_A3 (opcode);
+	  break;
+	case iw_T2I4_type:
+	  i = GET_IW_T2I4_A3 (opcode);
+	  break;
+	case iw_T2X1L3_type:
+	  i = GET_IW_T2X1L3_A3 (opcode);
+	  break;
+	case iw_T2X1I3_type:
+	  i = GET_IW_T2X1I3_A3 (opcode);
+	  break;
+	case iw_T3X1_type:
+	  i = GET_IW_T3X1_A3 (opcode);
+	  break;
+	case iw_T2X3_type:
+	  i = GET_IW_T2X3_A3 (opcode);
+	  break;
+	case iw_T1X1I6_type:
+	  i = GET_IW_T1X1I6_A3 (opcode);
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      i = nios2_r2_reg3_mappings[i];
+      (*info->fprintf_func) (info->stream, "%s", nios2_regs[i].name);
+      break;
+
+    case 'T':
+      switch (op->format)
+	{
+	case iw_T2I4_type:
+	  i = GET_IW_T2I4_B3 (opcode);
+	  break;
+	case iw_T3X1_type:
+	  i = GET_IW_T3X1_B3 (opcode);
+	  break;
+	case iw_T2X3_type:
+	  i = GET_IW_T2X3_B3 (opcode);
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      i = nios2_r2_reg3_mappings[i];
+      (*info->fprintf_func) (info->stream, "%s", nios2_regs[i].name);
+      break;
+
     case 'i':
       /* 16-bit signed immediate.  */
       switch (op->format)
@@ -344,6 +551,25 @@ nios2_print_insn_arg (const char *argptr,
 	case iw_i_type:
 	  i = (signed) (GET_IW_I_IMM16 (opcode) << 16) >> 16;
 	  break;
+	case iw_F2I16_type:
+	  i = (signed) (GET_IW_F2I16_IMM16 (opcode) << 16) >> 16;
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      (*info->fprintf_func) (info->stream, "%ld", i);
+      break;
+
+    case 'I':
+      /* 12-bit signed immediate.  */
+      switch (op->format)
+	{
+	case iw_F2X4I12_type:
+	  i = (signed) (GET_IW_F2X4I12_IMM12 (opcode) << 20) >> 20;
+	  break;
+	case iw_F1X4I12_type:
+	  i = (signed) (GET_IW_F1X4I12_IMM12 (opcode) << 20) >> 20;
+	  break;
 	default:
 	  bad_opcode (op);
 	}
@@ -357,6 +583,80 @@ nios2_print_insn_arg (const char *argptr,
 	case iw_i_type:
 	  i = GET_IW_I_IMM16 (opcode);
 	  break;
+	case iw_F2I16_type:
+	  i = GET_IW_F2I16_IMM16 (opcode);
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      (*info->fprintf_func) (info->stream, "%ld", i);
+      break;
+
+    case 'U':
+      /* 7-bit unsigned immediate with 2-bit shift.  */
+      switch (op->format)
+	{
+	case iw_T1I7_type:
+	  i = GET_IW_T1I7_IMM7 (opcode) << 2;
+	  break;
+	case iw_X1I7_type:
+	  i = GET_IW_X1I7_IMM7 (opcode) << 2;
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      (*info->fprintf_func) (info->stream, "%ld", i);
+      break;
+
+    case 'V':
+      /* 5-bit unsigned immediate with 2-bit shift.  */
+      switch (op->format)
+	{
+	case iw_F1I5_type:
+	  i = GET_IW_F1I5_IMM5 (opcode) << 2;
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      (*info->fprintf_func) (info->stream, "%ld", i);
+      break;
+
+    case 'W':
+      /* 4-bit unsigned immediate with 2-bit shift.  */
+      switch (op->format)
+	{
+	case iw_T2I4_type:
+	  i = GET_IW_T2I4_IMM4 (opcode) << 2;
+	  break;
+	case iw_L5I4X1_type:
+	  i = GET_IW_L5I4X1_IMM4 (opcode) << 2;
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      (*info->fprintf_func) (info->stream, "%ld", i);
+      break;
+
+    case 'X':
+      /* 4-bit unsigned immediate with 1-bit shift.  */
+      switch (op->format)
+	{
+	case iw_T2I4_type:
+	  i = GET_IW_T2I4_IMM4 (opcode) << 1;
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      (*info->fprintf_func) (info->stream, "%ld", i);
+      break;
+
+    case 'Y':
+      /* 4-bit unsigned immediate without shift.  */
+      switch (op->format)
+	{
+	case iw_T2I4_type:
+	  i = GET_IW_T2I4_IMM4 (opcode);
+	  break;
 	default:
 	  bad_opcode (op);
 	}
@@ -370,6 +670,9 @@ nios2_print_insn_arg (const char *argptr,
 	case iw_i_type:
 	  i = (signed) (GET_IW_I_IMM16 (opcode) << 16) >> 16;
 	  break;
+	case iw_F2I16_type:
+	  i = (signed) (GET_IW_F2I16_IMM16 (opcode) << 16) >> 16;
+	  break;
 	default:
 	  bad_opcode (op);
 	}
@@ -377,6 +680,34 @@ nios2_print_insn_arg (const char *argptr,
       (*info->print_address_func) (address, info);
       break;
 
+    case 'O':
+      /* 10-bit signed address offset with 1-bit shift.  */
+      switch (op->format)
+	{
+	case iw_I10_type:
+	  i = (signed) (GET_IW_I10_IMM10 (opcode) << 22) >> 21;
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      address = address + 2 + i;
+      (*info->print_address_func) (address, info);
+      break;
+
+    case 'P':
+      /* 7-bit signed address offset with 1-bit shift.  */
+      switch (op->format)
+	{
+	case iw_T1I7_type:
+	  i = (signed) (GET_IW_T1I7_IMM7 (opcode) << 25) >> 24;
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      address = address + 2 + i;
+      (*info->print_address_func) (address, info);
+      break;
+
     case 'j':
       /* 5-bit unsigned immediate.  */
       switch (op->format)
@@ -384,6 +715,28 @@ nios2_print_insn_arg (const char *argptr,
 	case iw_r_type:
 	  i = GET_IW_R_IMM5 (opcode);
 	  break;
+	case iw_F3X6L5_type:
+	  i = GET_IW_F3X6L5_IMM5 (opcode);
+	  break;
+	case iw_F2X6L10_type:
+	  i = GET_IW_F2X6L10_MSB (opcode);
+	  break;
+	case iw_X2L5_type:
+	  i = GET_IW_X2L5_IMM5 (opcode);
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      (*info->fprintf_func) (info->stream, "%ld", i);
+      break;
+
+    case 'k':
+      /* Second 5-bit unsigned immediate field.  */
+      switch (op->format)
+	{
+	case iw_F2X6L10_type:
+	  i = GET_IW_F2X6L10_LSB (opcode);
+	  break;
 	default:
 	  bad_opcode (op);
 	}
@@ -397,6 +750,9 @@ nios2_print_insn_arg (const char *argptr,
 	case iw_custom_type:
 	  i = GET_IW_CUSTOM_N (opcode);
 	  break;
+	case iw_F3X8_type:
+	  i = GET_IW_F3X8_N (opcode);
+	  break;
 	default:
 	  bad_opcode (op);
 	}
@@ -410,6 +766,9 @@ nios2_print_insn_arg (const char *argptr,
 	case iw_j_type:
 	  i = GET_IW_J_IMM26 (opcode);
 	  break;
+	case iw_L26_type:
+	  i = GET_IW_L26_IMM26 (opcode);
+	  break;
 	default:
 	  bad_opcode (op);
 	}
@@ -419,18 +778,144 @@ nios2_print_insn_arg (const char *argptr,
       (*info->print_address_func) (address, info);
       break;
 
-    case 'c':
-      /* Control register index.  */
+    case 'e':
+      /* Encoded enumeration for addi.n/subi.n.  */
       switch (op->format)
 	{
-	case iw_r_type:
-	  i = GET_IW_R_IMM5 (opcode);
+	case iw_T2X1I3_type:
+	  i = nios2_r2_asi_n_mappings[GET_IW_T2X1I3_IMM3 (opcode)];
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      (*info->fprintf_func) (info->stream, "%lu", i);
+      break;
+
+    case 'f':
+      /* Encoded enumeration for slli.n/srli.n.  */
+      switch (op->format)
+	{
+	case iw_T2X1L3_type:
+	  i = nios2_r2_shi_n_mappings[GET_IW_T2X1I3_IMM3 (opcode)];
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      (*info->fprintf_func) (info->stream, "%lu", i);
+      break;
+
+    case 'g':
+      /* Encoded enumeration for andi.n.  */
+      switch (op->format)
+	{
+	case iw_T2I4_type:
+	  i = nios2_r2_andi_n_mappings[GET_IW_T2I4_IMM4 (opcode)];
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      (*info->fprintf_func) (info->stream, "%lu", i);
+      break;
+
+    case 'h':
+      /* Encoded enumeration for movi.n.  */
+      switch (op->format)
+	{
+	case iw_T1I7_type:
+	  i = GET_IW_T1I7_IMM7 (opcode);
+	  if (i == 125)
+	    i = 0xff;
+	  else if (i == 126)
+	    i = -2;
+	  else if (i == 127)
+	    i = -1;
+	  break;
+	default:
+	  bad_opcode (op);
+	}
+      (*info->fprintf_func) (info->stream, "%ld", i);
+      break;
+
+    case 'R':
+      {
+	unsigned long reglist = 0;
+	int dir = 1;
+	int k, t;
+
+	switch (op->format)
+	  {
+	  case iw_F1X4L17_type:
+	    /* Encoding for ldwm/stwm.  */
+	    i = GET_IW_F1X4L17_REGMASK (opcode);
+	    if (GET_IW_F1X4L17_RS (opcode))
+	      {
+		reglist = ((i << 14) & 0x00ffc000);
+		if (i & (1 << 10))
+		  reglist |= (1 << 28);
+		if (i & (1 << 11))
+		  reglist |= (1 << 31);
+	      }
+	    else
+	      reglist = i << 2;
+	    dir = GET_IW_F1X4L17_REGMASK (opcode) ? 1 : -1;
+	    break;
+	    
+	  case iw_L5I4X1_type:
+	    /* Encoding for push.n/pop.n.  */
+	    reglist |= (1 << 31);
+	    if (GET_IW_L5I4X1_FP (opcode))
+	      reglist |= (1 << 28);
+	    if (GET_IW_L5I4X1_CS (opcode))
+	      {
+		int val = GET_IW_L5I4X1_REGRANGE (opcode);
+		reglist |= nios2_r2_reg_range_mappings[val];
+	      }
+	    dir = (op->match == MATCH_R2_POP_N ? 1 : -1);
+	    break;
+
+	  default:
+	    bad_opcode (op);
+	  }
+
+	t = 0;
+	(*info->fprintf_func) (info->stream, "{");
+	for (k = (dir == 1 ? 0 : 31);
+	     (dir == 1 && k < 32) || (dir == -1 && k >= 0);
+	     k += dir)
+	  if (reglist & (1 << k))
+	    {
+	      if (t)
+		(*info->fprintf_func) (info->stream, ",");
+	      else
+		t++;
+	      (*info->fprintf_func) (info->stream, "%s", nios2_regs[k].name);
+	    }
+	(*info->fprintf_func) (info->stream, "}");
+	break;
+      }
+
+    case 'B':
+      /* Base register and options for ldwm/stwm.  */
+      switch (op->format)
+	{
+	case iw_F1X4L17_type:
+	  if (GET_IW_F1X4L17_ID (opcode) == 0)
+	    (*info->fprintf_func) (info->stream, "--");
+
+	  i = GET_IW_F1X4I12_A (opcode);
+	  (*info->fprintf_func) (info->stream, "(%s)", 
+				 nios2_builtin_regs[i].name);
+
+	  if (GET_IW_F1X4L17_ID (opcode))
+	    (*info->fprintf_func) (info->stream, "++");
+	  if (GET_IW_F1X4L17_WB (opcode))
+	    (*info->fprintf_func) (info->stream, ",writeback");
+	  if (GET_IW_F1X4L17_PC (opcode))
+	    (*info->fprintf_func) (info->stream, ",ret");
 	  break;
 	default:
 	  bad_opcode (op);
 	}
-      reg_base = nios2_control_regs ();
-      (*info->fprintf_func) (info->stream, "%s", reg_base[i].name);
       break;
 
     default:
@@ -512,14 +997,27 @@ print_insn_nios2 (bfd_vma address, disassemble_info *info,
 	insn = (unsigned long) bfd_getb32 (buffer);
       else
 	insn = (unsigned long) bfd_getl32 (buffer);
-      status = nios2_disassemble (address, insn, info);
+      return nios2_disassemble (address, insn, info);
     }
-  else
+
+  /* We might have a 16-bit R2 instruction at the end of memory.  Try that.  */
+  if (info->mach == bfd_mach_nios2r2)
     {
-      (*info->memory_error_func) (status, address, info);
-      status = -1;
+      status = (*info->read_memory_func) (address, buffer, 2, info);
+      if (status == 0)
+	{
+	  unsigned long insn;
+	  if (endianness == BFD_ENDIAN_BIG)
+	    insn = (unsigned long) bfd_getb16 (buffer);
+	  else
+	    insn = (unsigned long) bfd_getl16 (buffer);
+	  return nios2_disassemble (address, insn, info);
+	}
     }
-  return status;
+
+  /* If we got here, we couldn't read anything.  */
+  (*info->memory_error_func) (status, address, info);
+  return -1;
 }
 
 /* These two functions are the main entry points, accessed from
diff --git a/opcodes/nios2-opc.c b/opcodes/nios2-opc.c
index d5ec06fb443..d119f9a7557 100644
--- a/opcodes/nios2-opc.c
+++ b/opcodes/nios2-opc.c
@@ -30,36 +30,36 @@ const struct nios2_reg nios2_builtin_regs[] = {
   /* Standard register names.  */
   {"zero", 0, REG_NORMAL},
   {"at", 1, REG_NORMAL},			/* assembler temporary */
-  {"r2", 2, REG_NORMAL},
-  {"r3", 3, REG_NORMAL},
-  {"r4", 4, REG_NORMAL},
-  {"r5", 5, REG_NORMAL},
-  {"r6", 6, REG_NORMAL},
-  {"r7", 7, REG_NORMAL},
-  {"r8", 8, REG_NORMAL},
-  {"r9", 9, REG_NORMAL},
-  {"r10", 10, REG_NORMAL},
-  {"r11", 11, REG_NORMAL},
-  {"r12", 12, REG_NORMAL},
-  {"r13", 13, REG_NORMAL},
-  {"r14", 14, REG_NORMAL},
-  {"r15", 15, REG_NORMAL},
-  {"r16", 16, REG_NORMAL},
-  {"r17", 17, REG_NORMAL},
-  {"r18", 18, REG_NORMAL},
-  {"r19", 19, REG_NORMAL},
-  {"r20", 20, REG_NORMAL},
-  {"r21", 21, REG_NORMAL},
-  {"r22", 22, REG_NORMAL},
-  {"r23", 23, REG_NORMAL},
+  {"r2", 2, REG_NORMAL | REG_3BIT | REG_LDWM},
+  {"r3", 3, REG_NORMAL | REG_3BIT | REG_LDWM},
+  {"r4", 4, REG_NORMAL | REG_3BIT | REG_LDWM},
+  {"r5", 5, REG_NORMAL | REG_3BIT | REG_LDWM},
+  {"r6", 6, REG_NORMAL | REG_3BIT | REG_LDWM},
+  {"r7", 7, REG_NORMAL | REG_3BIT | REG_LDWM},
+  {"r8", 8, REG_NORMAL | REG_LDWM},
+  {"r9", 9, REG_NORMAL | REG_LDWM},
+  {"r10", 10, REG_NORMAL | REG_LDWM},
+  {"r11", 11, REG_NORMAL | REG_LDWM},
+  {"r12", 12, REG_NORMAL | REG_LDWM},
+  {"r13", 13, REG_NORMAL | REG_LDWM},
+  {"r14", 14, REG_NORMAL | REG_LDWM},
+  {"r15", 15, REG_NORMAL | REG_LDWM},
+  {"r16", 16, REG_NORMAL | REG_3BIT | REG_LDWM | REG_POP},
+  {"r17", 17, REG_NORMAL | REG_3BIT | REG_LDWM | REG_POP},
+  {"r18", 18, REG_NORMAL | REG_LDWM | REG_POP},
+  {"r19", 19, REG_NORMAL | REG_LDWM | REG_POP},
+  {"r20", 20, REG_NORMAL | REG_LDWM | REG_POP},
+  {"r21", 21, REG_NORMAL | REG_LDWM | REG_POP},
+  {"r22", 22, REG_NORMAL | REG_LDWM | REG_POP},
+  {"r23", 23, REG_NORMAL | REG_LDWM | REG_POP},
   {"et", 24, REG_NORMAL},
   {"bt", 25, REG_NORMAL},
   {"gp", 26, REG_NORMAL},			/* global pointer */
   {"sp", 27, REG_NORMAL},			/* stack pointer */
-  {"fp", 28, REG_NORMAL},			/* frame pointer */
+  {"fp", 28, REG_NORMAL | REG_LDWM | REG_POP},	/* frame pointer */
   {"ea", 29, REG_NORMAL},			/* exception return address */
   {"sstatus", 30, REG_NORMAL},			/* saved processor status */
-  {"ra", 31, REG_NORMAL},			/* return address */
+  {"ra", 31, REG_NORMAL | REG_LDWM | REG_POP},	/* return address */
 
   /* Alternative names for special registers.  */
   {"r0", 0, REG_NORMAL},
@@ -68,11 +68,11 @@ const struct nios2_reg nios2_builtin_regs[] = {
   {"r25", 25, REG_NORMAL},
   {"r26", 26, REG_NORMAL},
   {"r27", 27, REG_NORMAL},
-  {"r28", 28, REG_NORMAL},
+  {"r28", 28, REG_NORMAL | REG_LDWM | REG_POP},
   {"r29", 29, REG_NORMAL},
   {"r30", 30, REG_NORMAL},
   {"ba", 30, REG_NORMAL},			/* breakpoint return address */
-  {"r31", 31, REG_NORMAL},
+  {"r31", 31, REG_NORMAL | REG_LDWM | REG_POP},
 
   /* Control register names.  */
   {"status", 0, REG_CONTROL},
@@ -398,10 +398,386 @@ const struct nios2_opcode nios2_r1_opcodes[] =
    MATCH_R1_XORI, MASK_R1_XORI, 0, unsigned_immed16_overflow}
 };
 
-#define NIOS2_NUM_OPCODES \
+#define NIOS2_NUM_R1_OPCODES \
        ((sizeof nios2_r1_opcodes) / (sizeof (nios2_r1_opcodes[0])))
-const int nios2_num_r1_opcodes = NIOS2_NUM_OPCODES;
+const int nios2_num_r1_opcodes = NIOS2_NUM_R1_OPCODES;
 
+
+const struct nios2_opcode nios2_r2_opcodes[] =
+{
+  /* { name, args, args_test, num_args, size, format,
+       match, mask, pinfo, overflow } */
+  {"add", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_ADD, MASK_R2_ADD, 0, no_overflow},
+  {"addi", "t,s,i", "t,s,i,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_ADDI, MASK_R2_ADDI, 0, signed_immed16_overflow},
+  {"add.n", "D,S,T", "D,S,T,E", 3, 2, iw_T3X1_type,
+   MATCH_R2_ADD_N, MASK_R2_ADD_N, 0, no_overflow},
+  {"addi.n", "D,S,e", "D,S,e,E", 3, 2, iw_T2X1I3_type,
+   MATCH_R2_ADDI_N, MASK_R2_ADDI_N, 0, enumeration_overflow},
+  {"and", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_AND, MASK_R2_AND, 0, no_overflow},
+  {"andchi", "t,s,u", "t,s,u,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_ANDCHI, MASK_R2_ANDCHI, 0, unsigned_immed16_overflow},
+  {"andci", "t,s,u", "t,s,u,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_ANDCI, MASK_R2_ANDCI, 0, unsigned_immed16_overflow},
+  {"andhi", "t,s,u", "t,s,u,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_ANDHI, MASK_R2_ANDHI, 0, unsigned_immed16_overflow},
+  {"andi", "t,s,u", "t,s,u,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_ANDI, MASK_R2_ANDI, 0, unsigned_immed16_overflow},
+  {"andi.n", "T,S,g", "T,S,g,E", 3, 2, iw_T2I4_type,
+   MATCH_R2_ANDI_N, MASK_R2_ANDI_N, 0, enumeration_overflow},
+  {"and.n", "D,S,T", "D,S,T,E", 3, 2, iw_T2X3_type,
+   MATCH_R2_AND_N, MASK_R2_AND_N, 0, no_overflow},
+  {"beq", "s,t,o", "s,t,o,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_BEQ, MASK_R2_BEQ, NIOS2_INSN_CBRANCH, branch_target_overflow},
+  {"beqz.n", "S,P", "S,P,E", 2, 2, iw_T1I7_type,
+   MATCH_R2_BEQZ_N, MASK_R2_BEQZ_N, NIOS2_INSN_CBRANCH, branch_target_overflow},
+  {"bge", "s,t,o", "s,t,o,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_BGE, MASK_R2_BGE, NIOS2_INSN_CBRANCH, branch_target_overflow},
+  {"bgeu", "s,t,o", "s,t,o,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_BGEU, MASK_R2_BGEU, NIOS2_INSN_CBRANCH, branch_target_overflow},
+  {"bgt", "s,t,o", "s,t,o,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_BGT, MASK_R2_BGT,
+   NIOS2_INSN_MACRO|NIOS2_INSN_CBRANCH, branch_target_overflow},
+  {"bgtu", "s,t,o", "s,t,o,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_BGTU, MASK_R2_BGTU,
+   NIOS2_INSN_MACRO|NIOS2_INSN_CBRANCH, branch_target_overflow},
+  {"ble", "s,t,o", "s,t,o,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_BLE, MASK_R2_BLE,
+   NIOS2_INSN_MACRO|NIOS2_INSN_CBRANCH, branch_target_overflow},
+  {"bleu", "s,t,o", "s,t,o,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_BLEU, MASK_R2_BLEU,
+   NIOS2_INSN_MACRO|NIOS2_INSN_CBRANCH, branch_target_overflow},
+  {"blt", "s,t,o", "s,t,o,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_BLT, MASK_R2_BLT, NIOS2_INSN_CBRANCH, branch_target_overflow},
+  {"bltu", "s,t,o", "s,t,o,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_BLTU, MASK_R2_BLTU, NIOS2_INSN_CBRANCH, branch_target_overflow},
+  {"bne", "s,t,o", "s,t,o,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_BNE, MASK_R2_BNE, NIOS2_INSN_CBRANCH, branch_target_overflow},
+  {"bnez.n", "S,P", "S,P,E", 2, 2, iw_T1I7_type,
+   MATCH_R2_BNEZ_N, MASK_R2_BNEZ_N, NIOS2_INSN_CBRANCH, branch_target_overflow},
+  {"br", "o", "o,E", 1, 4, iw_F2I16_type,
+   MATCH_R2_BR, MASK_R2_BR, NIOS2_INSN_UBRANCH, branch_target_overflow},
+  {"break", "j", "j,E", 1, 4, iw_F3X6L5_type,
+   MATCH_R2_BREAK, MASK_R2_BREAK, NIOS2_INSN_OPTARG, no_overflow},
+  {"break.n", "j", "j,E", 1, 2, iw_X2L5_type,
+   MATCH_R2_BREAK_N, MASK_R2_BREAK_N, NIOS2_INSN_OPTARG, no_overflow},
+  {"bret", "", "E", 0, 4, iw_F3X6_type,
+   MATCH_R2_BRET, MASK_R2_BRET, 0, no_overflow},
+  {"br.n", "O", "O,E", 1, 2, iw_I10_type,
+   MATCH_R2_BR_N, MASK_R2_BR_N, NIOS2_INSN_UBRANCH, branch_target_overflow},
+  {"call", "m", "m,E", 1, 4, iw_L26_type,
+   MATCH_R2_CALL, MASK_R2_CALL, NIOS2_INSN_CALL, call_target_overflow},
+  {"callr", "s", "s,E", 1, 4, iw_F3X6_type,
+   MATCH_R2_CALLR, MASK_R2_CALLR, 0, no_overflow},
+  {"callr.n", "s", "s,E", 1, 2, iw_F1X1_type,
+   MATCH_R2_CALLR_N, MASK_R2_CALLR_N, 0, no_overflow},
+  {"cmpeq", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_CMPEQ, MASK_R2_CMPEQ, 0, no_overflow},
+  {"cmpeqi", "t,s,i", "t,s,i,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_CMPEQI, MASK_R2_CMPEQI, 0, signed_immed16_overflow},
+  {"cmpge", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_CMPGE, MASK_R2_CMPGE, 0, no_overflow},
+  {"cmpgei", "t,s,i", "t,s,i,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_CMPGEI, MASK_R2_CMPGEI, 0, signed_immed16_overflow},
+  {"cmpgeu", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_CMPGEU, MASK_R2_CMPGEU, 0, no_overflow},
+  {"cmpgeui", "t,s,u", "t,s,u,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_CMPGEUI, MASK_R2_CMPGEUI, 0, unsigned_immed16_overflow},
+  {"cmpgt", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_CMPGT, MASK_R2_CMPGT, NIOS2_INSN_MACRO, no_overflow},
+  {"cmpgti", "t,s,i", "t,s,i,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_CMPGTI, MASK_R2_CMPGTI, NIOS2_INSN_MACRO, signed_immed16_overflow},
+  {"cmpgtu", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_CMPGTU, MASK_R2_CMPGTU, NIOS2_INSN_MACRO, no_overflow},
+  {"cmpgtui", "t,s,u", "t,s,u,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_CMPGTUI, MASK_R2_CMPGTUI,
+   NIOS2_INSN_MACRO, unsigned_immed16_overflow},
+  {"cmple", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_CMPLE, MASK_R2_CMPLE, NIOS2_INSN_MACRO, no_overflow},
+  {"cmplei", "t,s,i", "t,s,i,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_CMPLEI, MASK_R2_CMPLEI, NIOS2_INSN_MACRO, signed_immed16_overflow},
+  {"cmpleu", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_CMPLEU, MASK_R2_CMPLEU, NIOS2_INSN_MACRO, no_overflow},
+  {"cmpleui", "t,s,u", "t,s,u,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_CMPLEUI, MASK_R2_CMPLEUI,
+   NIOS2_INSN_MACRO, unsigned_immed16_overflow},
+  {"cmplt", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_CMPLT, MASK_R2_CMPLT, 0, no_overflow},
+  {"cmplti", "t,s,i", "t,s,i,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_CMPLTI, MASK_R2_CMPLTI, 0, signed_immed16_overflow},
+  {"cmpltu", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_CMPLTU, MASK_R2_CMPLTU, 0, no_overflow},
+  {"cmpltui", "t,s,u", "t,s,u,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_CMPLTUI, MASK_R2_CMPLTUI, 0, unsigned_immed16_overflow},
+  {"cmpne", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_CMPNE, MASK_R2_CMPNE, 0, no_overflow},
+  {"cmpnei", "t,s,i", "t,s,i,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_CMPNEI, MASK_R2_CMPNEI, 0, signed_immed16_overflow},
+  {"custom", "l,d,s,t", "l,d,s,t,E", 4, 4, iw_F3X8_type,
+   MATCH_R2_CUSTOM, MASK_R2_CUSTOM, 0, custom_opcode_overflow},
+  {"div", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_DIV, MASK_R2_DIV, 0, no_overflow},
+  {"divu", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_DIVU, MASK_R2_DIVU, 0, no_overflow},
+  {"eni", "j", "j,E", 1, 4, iw_F3X6L5_type,
+   MATCH_R2_ENI, MASK_R2_ENI, NIOS2_INSN_OPTARG, no_overflow},
+  {"eret", "", "E", 0, 4, iw_F3X6_type,
+   MATCH_R2_ERET, MASK_R2_ERET, 0, no_overflow},
+  {"extract", "t,s,j,k", "t,s,j,k,E", 4, 4, iw_F2X6L10_type,
+   MATCH_R2_EXTRACT, MASK_R2_EXTRACT, 0, no_overflow},
+  {"flushd", "I(s)", "I(s),E", 2, 4, iw_F1X4I12_type,
+   MATCH_R2_FLUSHD, MASK_R2_FLUSHD, 0, address_offset_overflow},
+  {"flushda", "I(s)", "I(s),E", 2, 4, iw_F1X4I12_type,
+   MATCH_R2_FLUSHDA, MASK_R2_FLUSHDA, 0, address_offset_overflow},
+  {"flushi", "s", "s,E", 1, 4, iw_F3X6_type,
+   MATCH_R2_FLUSHI, MASK_R2_FLUSHI, 0, no_overflow},
+  {"flushp", "", "E", 0, 4, iw_F3X6_type,
+   MATCH_R2_FLUSHP, MASK_R2_FLUSHP, 0, no_overflow},
+  {"initd", "I(s)", "I(s),E", 2, 4, iw_F1X4I12_type,
+   MATCH_R2_INITD, MASK_R2_INITD, 0, address_offset_overflow},
+  {"initda", "I(s)", "I(s),E", 2, 4, iw_F1X4I12_type,
+   MATCH_R2_INITDA, MASK_R2_INITDA, 0, address_offset_overflow},
+  {"initi", "s", "s,E", 1, 4, iw_F3X6_type,
+   MATCH_R2_INITI, MASK_R2_INITI, 0, no_overflow},
+  {"insert", "t,s,j,k", "t,s,j,k,E", 4, 4, iw_F2X6L10_type,
+   MATCH_R2_INSERT, MASK_R2_INSERT, 0, no_overflow},
+  {"jmp", "s", "s,E", 1, 4, iw_F3X6_type,
+   MATCH_R2_JMP, MASK_R2_JMP, 0, no_overflow},
+  {"jmpi", "m", "m,E", 1, 4, iw_L26_type,
+   MATCH_R2_JMPI, MASK_R2_JMPI, 0, call_target_overflow},
+  {"jmpr.n", "s", "s,E", 1, 2, iw_F1X1_type,
+   MATCH_R2_JMPR_N, MASK_R2_JMPR_N, 0, no_overflow},
+  {"ldb", "t,i(s)", "t,i(s),E", 3, 4, iw_F2I16_type,
+   MATCH_R2_LDB, MASK_R2_LDB, 0, address_offset_overflow},
+  {"ldbio", "t,I(s)", "t,I(s),E", 3, 4, iw_F2X4I12_type,
+   MATCH_R2_LDBIO, MASK_R2_LDBIO, 0, signed_immed12_overflow},
+  {"ldbu", "t,i(s)", "t,i(s),E", 3, 4, iw_F2I16_type,
+   MATCH_R2_LDBU, MASK_R2_LDBU, 0, address_offset_overflow},
+  {"ldbuio", "t,I(s)", "t,I(s),E", 3, 4, iw_F2X4I12_type,
+   MATCH_R2_LDBUIO, MASK_R2_LDBUIO, 0, signed_immed12_overflow},
+  {"ldbu.n", "T,Y(S)", "T,Y(S),E", 3, 2, iw_T2I4_type,
+   MATCH_R2_LDBU_N, MASK_R2_LDBU_N, 0, address_offset_overflow},
+  {"ldex", "d,(s)", "d,(s),E", 2, 4, iw_F3X6_type,
+   MATCH_R2_LDEX, MASK_R2_LDEX, 0, no_overflow},
+  {"ldh", "t,i(s)", "t,i(s),E", 3, 4, iw_F2I16_type,
+   MATCH_R2_LDH, MASK_R2_LDH, 0, address_offset_overflow},
+  {"ldhio", "t,I(s)", "t,I(s),E", 3, 4, iw_F2X4I12_type,
+   MATCH_R2_LDHIO, MASK_R2_LDHIO, 0, signed_immed12_overflow},
+  {"ldhu", "t,i(s)", "t,i(s),E", 3, 4, iw_F2I16_type,
+   MATCH_R2_LDHU, MASK_R2_LDHU, 0, address_offset_overflow},
+  {"ldhuio", "t,I(s)", "t,I(s),E", 3, 4, iw_F2X4I12_type,
+   MATCH_R2_LDHUIO, MASK_R2_LDHUIO, 0, signed_immed12_overflow},
+  {"ldhu.n", "T,X(S)", "T,X(S),E", 3, 2, iw_T2I4_type,
+   MATCH_R2_LDHU_N, MASK_R2_LDHU_N, 0, address_offset_overflow},
+  {"ldsex", "d,(s)", "d,(s),E", 2, 4, iw_F3X6_type,
+   MATCH_R2_LDSEX, MASK_R2_LDSEX, 0, no_overflow},
+  {"ldw", "t,i(s)", "t,i(s),E", 3, 4, iw_F2I16_type,
+   MATCH_R2_LDW, MASK_R2_LDW, 0, address_offset_overflow},
+  {"ldwio", "t,I(s)", "t,I(s),E", 3, 4, iw_F2X4I12_type,
+   MATCH_R2_LDWIO, MASK_R2_LDWIO, 0, signed_immed12_overflow},
+  {"ldwm", "R,B", "R,B,E", 2, 4, iw_F1X4L17_type,
+   MATCH_R2_LDWM, MASK_R2_LDWM, 0, no_overflow},
+  {"ldw.n", "T,W(S)", "T,W(S),E", 3, 2, iw_T2I4_type,
+   MATCH_R2_LDW_N, MASK_R2_LDW_N, 0, address_offset_overflow},
+  {"ldwsp.n", "t,V(s)", "t,V(s),E", 3, 2, iw_F1I5_type,
+   MATCH_R2_LDWSP_N, MASK_R2_LDWSP_N, 0, address_offset_overflow},
+  {"merge", "t,s,j,k", "t,s,j,k,E", 4, 4, iw_F2X6L10_type,
+   MATCH_R2_MERGE, MASK_R2_MERGE, 0, no_overflow},
+  {"mov", "d,s", "d,s,E", 2, 4, iw_F3X6_type,
+   MATCH_R2_MOV, MASK_R2_MOV, NIOS2_INSN_MACRO_MOV, no_overflow},
+  {"mov.n", "d,s", "d,s,E", 2, 2, iw_F2_type,
+   MATCH_R2_MOV_N, MASK_R2_MOV_N, 0, no_overflow},
+  {"movi.n", "D,h", "D,h,E", 2, 2, iw_T1I7_type,
+   MATCH_R2_MOVI_N, MASK_R2_MOVI_N, 0, enumeration_overflow},
+  {"movhi", "t,u", "t,u,E", 2, 4, iw_F2I16_type,
+   MATCH_R2_MOVHI, MASK_R2_MOVHI,
+   NIOS2_INSN_MACRO_MOVI, unsigned_immed16_overflow},
+  {"movi", "t,i", "t,i,E", 2, 4, iw_F2I16_type,
+   MATCH_R2_MOVI, MASK_R2_MOVI, NIOS2_INSN_MACRO_MOVI, signed_immed16_overflow},
+  {"movia", "t,o", "t,o,E", 2, 4, iw_F2I16_type,
+   MATCH_R2_ORHI, MASK_R2_ORHI, NIOS2_INSN_MACRO_MOVIA, no_overflow},
+  {"movui", "t,u", "t,u,E", 2, 4, iw_F2I16_type,
+   MATCH_R2_MOVUI, MASK_R2_MOVUI,
+   NIOS2_INSN_MACRO_MOVI, unsigned_immed16_overflow},
+  {"mul", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_MUL, MASK_R2_MUL, 0, no_overflow},
+  {"muli", "t,s,i", "t,s,i,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_MULI, MASK_R2_MULI, 0, signed_immed16_overflow},
+  {"mulxss", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_MULXSS, MASK_R2_MULXSS, 0, no_overflow},
+  {"mulxsu", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_MULXSU, MASK_R2_MULXSU, 0, no_overflow},
+  {"mulxuu", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_MULXUU, MASK_R2_MULXUU, 0, no_overflow},
+  /* The encoding of the neg.n operands is backwards, not
+     the interpretation -- the first operand is still the
+     destination and the second the source.  */
+  {"neg.n", "S,D", "S,D,E", 2, 2, iw_T2X3_type,
+   MATCH_R2_NEG_N, MASK_R2_NEG_N, 0, no_overflow},
+  {"nextpc", "d", "d,E", 1, 4, iw_F3X6_type,
+   MATCH_R2_NEXTPC, MASK_R2_NEXTPC, 0, no_overflow},
+  {"nop", "", "E", 0, 4, iw_F3X6_type,
+   MATCH_R2_NOP, MASK_R2_NOP, NIOS2_INSN_MACRO_MOV, no_overflow},
+  {"nop.n", "", "E", 0, 2, iw_F2_type,
+   MATCH_R2_NOP_N, MASK_R2_NOP_N, NIOS2_INSN_MACRO_MOV, no_overflow},
+  {"nor", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_NOR, MASK_R2_NOR, 0, no_overflow},
+  {"not.n", "D,S", "D,S,E", 2, 2, iw_T2X3_type,
+   MATCH_R2_NOT_N, MASK_R2_NOT_N, 0, no_overflow},
+  {"or", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_OR, MASK_R2_OR, 0, no_overflow},
+  {"orhi", "t,s,u", "t,s,u,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_ORHI, MASK_R2_ORHI, 0, unsigned_immed16_overflow},
+  {"ori", "t,s,u", "t,s,u,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_ORI, MASK_R2_ORI, 0, unsigned_immed16_overflow},
+  {"or.n", "D,S,T", "D,S,T,E", 3, 2, iw_T2X3_type,
+   MATCH_R2_OR_N, MASK_R2_OR_N, 0, no_overflow},
+  {"pop.n", "R,W", "R,W,E", 2, 2, iw_L5I4X1_type,
+   MATCH_R2_POP_N, MASK_R2_POP_N, NIOS2_INSN_OPTARG, no_overflow},
+  {"push.n", "R,W", "R,W,E", 2, 2, iw_L5I4X1_type,
+   MATCH_R2_PUSH_N, MASK_R2_PUSH_N, NIOS2_INSN_OPTARG, no_overflow},
+  {"rdctl", "d,c", "d,c,E", 2, 4, iw_F3X6L5_type,
+   MATCH_R2_RDCTL, MASK_R2_RDCTL, 0, no_overflow},
+  {"rdprs", "t,s,I", "t,s,I,E", 3, 4, iw_F2X4I12_type,
+   MATCH_R2_RDPRS, MASK_R2_RDPRS, 0, signed_immed12_overflow},
+  {"ret", "", "E", 0, 4, iw_F3X6_type,
+   MATCH_R2_RET, MASK_R2_RET, 0, no_overflow},
+  {"ret.n", "", "E", 0, 2, iw_X2L5_type,
+   MATCH_R2_RET_N, MASK_R2_RET_N, 0, no_overflow},
+  {"rol", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_ROL, MASK_R2_ROL, 0, no_overflow},
+  {"roli", "d,s,j", "d,s,j,E", 3, 4, iw_F3X6L5_type,
+   MATCH_R2_ROLI, MASK_R2_ROLI, 0, unsigned_immed5_overflow},
+  {"ror", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_ROR, MASK_R2_ROR, 0, no_overflow},
+  {"sll", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_SLL, MASK_R2_SLL, 0, no_overflow},
+  {"slli", "d,s,j", "d,s,j,E", 3, 4, iw_F3X6L5_type,
+   MATCH_R2_SLLI, MASK_R2_SLLI, 0, unsigned_immed5_overflow},
+  {"sll.n", "D,S,T", "D,S,T,E", 3, 2, iw_T2X3_type,
+   MATCH_R2_SLL_N, MASK_R2_SLL_N, 0, no_overflow},
+  {"slli.n", "D,S,f", "D,S,f,E", 3, 2, iw_T2X1L3_type,
+   MATCH_R2_SLLI_N, MASK_R2_SLLI_N, 0, enumeration_overflow},
+  {"spaddi.n", "D,U", "D,U,E", 2, 2, iw_T1I7_type,
+   MATCH_R2_SPADDI_N, MASK_R2_SPADDI_N, 0, address_offset_overflow},
+  {"spdeci.n", "U", "U,E", 1, 2, iw_X1I7_type,
+   MATCH_R2_SPDECI_N, MASK_R2_SPDECI_N, 0, address_offset_overflow},
+  {"spinci.n", "U", "U,E", 1, 2, iw_X1I7_type,
+   MATCH_R2_SPINCI_N, MASK_R2_SPINCI_N, 0, address_offset_overflow},
+  {"sra", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_SRA, MASK_R2_SRA, 0, no_overflow},
+  {"srai", "d,s,j", "d,s,j,E", 3, 4, iw_F3X6L5_type,
+   MATCH_R2_SRAI, MASK_R2_SRAI, 0, unsigned_immed5_overflow},
+  {"srl", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_SRL, MASK_R2_SRL, 0, no_overflow},
+  {"srli", "d,s,j", "d,s,j,E", 3, 4, iw_F3X6L5_type,
+   MATCH_R2_SRLI, MASK_R2_SRLI, 0, unsigned_immed5_overflow},
+  {"srl.n", "D,S,T", "D,S,T,E", 3, 2, iw_T2X3_type,
+   MATCH_R2_SRL_N, MASK_R2_SRL_N, 0, no_overflow},
+  {"srli.n", "D,S,f", "D,S,f,E", 3, 2, iw_T2X1L3_type,
+   MATCH_R2_SRLI_N, MASK_R2_SRLI_N, 0, enumeration_overflow},
+  {"stb", "t,i(s)", "t,i(s),E", 3, 4, iw_F2I16_type,
+   MATCH_R2_STB, MASK_R2_STB, 0, address_offset_overflow},
+  {"stbio", "t,I(s)", "t,I(s),E", 3, 4, iw_F2X4I12_type,
+   MATCH_R2_STBIO, MASK_R2_STBIO, 0, signed_immed12_overflow},
+  {"stb.n", "T,Y(S)", "T,Y(S),E", 3, 2, iw_T2I4_type,
+   MATCH_R2_STB_N, MASK_R2_STB_N, 0, address_offset_overflow},
+  {"stbz.n", "t,M(S)", "t,M(S),E", 3, 2, iw_T1X1I6_type,
+   MATCH_R2_STBZ_N, MASK_R2_STBZ_N, 0, address_offset_overflow},
+  {"stex", "d,t,(s)", "d,t,(s),E", 3, 4, iw_F3X6_type,
+   MATCH_R2_STEX, MASK_R2_STEX, 0, no_overflow},
+  {"sth", "t,i(s)", "t,i(s),E", 3, 4, iw_F2I16_type,
+   MATCH_R2_STH, MASK_R2_STH, 0, address_offset_overflow},
+  {"sthio", "t,I(s)", "t,I(s),E", 3, 4, iw_F2X4I12_type,
+   MATCH_R2_STHIO, MASK_R2_STHIO, 0, signed_immed12_overflow},
+  {"sth.n", "T,X(S)", "T,X(S),E", 3, 2, iw_T2I4_type,
+   MATCH_R2_STH_N, MASK_R2_STH_N, 0, address_offset_overflow},
+  {"stsex", "d,t,(s)", "d,t,(s),E", 3, 4, iw_F3X6_type,
+   MATCH_R2_STSEX, MASK_R2_STSEX, 0, no_overflow},
+  {"stw", "t,i(s)", "t,i(s),E", 3, 4, iw_F2I16_type,
+   MATCH_R2_STW, MASK_R2_STW, 0, address_offset_overflow},
+  {"stwio", "t,I(s)", "t,I(s),E", 3, 4, iw_F2X4I12_type,
+   MATCH_R2_STWIO, MASK_R2_STWIO, 0, signed_immed12_overflow},
+  {"stwm", "R,B", "R,B,E", 2, 4, iw_F1X4L17_type,
+   MATCH_R2_STWM, MASK_R2_STWM, 0, no_overflow},
+  {"stwsp.n", "t,V(s)", "t,V(s),E", 3, 2, iw_F1I5_type,
+   MATCH_R2_STWSP_N, MASK_R2_STWSP_N, 0, address_offset_overflow},
+  {"stw.n", "T,W(S)", "T,W(S),E", 3, 2, iw_T2I4_type,
+   MATCH_R2_STW_N, MASK_R2_STW_N, 0, address_offset_overflow},
+  {"stwz.n", "t,N(S)", "t,N(S),E", 3, 2, iw_T1X1I6_type,
+   MATCH_R2_STWZ_N, MASK_R2_STWZ_N, 0, address_offset_overflow},
+  {"sub", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_SUB, MASK_R2_SUB, 0, no_overflow},
+  {"subi", "t,s,i", "t,s,i,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_SUBI, MASK_R2_SUBI, NIOS2_INSN_MACRO, signed_immed16_overflow},
+  {"sub.n", "D,S,T", "D,S,T,E", 3, 2, iw_T3X1_type,
+   MATCH_R2_SUB_N, MASK_R2_SUB_N, 0, no_overflow},
+  {"subi.n", "D,S,e", "D,S,e,E", 3, 2, iw_T2X1I3_type,
+   MATCH_R2_SUBI_N, MASK_R2_SUBI_N, 0, enumeration_overflow},
+  {"sync", "", "E", 0, 4, iw_F3X6_type,
+   MATCH_R2_SYNC, MASK_R2_SYNC, 0, no_overflow},
+  {"trap", "j", "j,E", 1, 4, iw_F3X6L5_type,
+   MATCH_R2_TRAP, MASK_R2_TRAP, NIOS2_INSN_OPTARG, no_overflow},
+  {"trap.n", "j", "j,E", 1, 2, iw_X2L5_type,
+   MATCH_R2_TRAP_N, MASK_R2_TRAP_N, NIOS2_INSN_OPTARG, no_overflow},
+  {"wrctl", "c,s", "c,s,E", 2, 4, iw_F3X6L5_type,
+   MATCH_R2_WRCTL, MASK_R2_WRCTL, 0, no_overflow},
+  {"wrpie", "d,s", "d,s,E", 2, 4, iw_F3X6L5_type,
+   MATCH_R2_WRPIE, MASK_R2_WRPIE, 0, no_overflow},
+  {"wrprs", "d,s", "d,s,E", 2, 4, iw_F3X6_type,
+   MATCH_R2_WRPRS, MASK_R2_WRPRS, 0, no_overflow},
+  {"xor", "d,s,t", "d,s,t,E", 3, 4, iw_F3X6_type,
+   MATCH_R2_XOR, MASK_R2_XOR, 0, no_overflow},
+  {"xorhi", "t,s,u", "t,s,u,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_XORHI, MASK_R2_XORHI, 0, unsigned_immed16_overflow},
+  {"xori", "t,s,u", "t,s,u,E", 3, 4, iw_F2I16_type,
+   MATCH_R2_XORI, MASK_R2_XORI, 0, unsigned_immed16_overflow},
+  {"xor.n", "D,S,T", "D,S,T,E", 3, 2, iw_T2X3_type,
+   MATCH_R2_XOR_N, MASK_R2_XOR_N, 0, no_overflow},
+};
+
+#define NIOS2_NUM_R2_OPCODES \
+       ((sizeof nios2_r2_opcodes) / (sizeof (nios2_r2_opcodes[0])))
+const int nios2_num_r2_opcodes = NIOS2_NUM_R2_OPCODES;
+
+/* Default to using the R1 instruction tables.  */
 struct nios2_opcode *nios2_opcodes = (struct nios2_opcode *) nios2_r1_opcodes;
-int nios2_num_opcodes = NIOS2_NUM_OPCODES;
-#undef NIOS2_NUM_OPCODES
+int nios2_num_opcodes = NIOS2_NUM_R1_OPCODES;
+#undef NIOS2_NUM_R1_OPCODES
+#undef NIOS2_NUM_R2_OPCODES
+
+/* Decodings for R2 asi.n (addi.n/subi.n) immediate values.  */
+unsigned int nios2_r2_asi_n_mappings[] =
+  {1, 2, 4, 8, 16, 32, 64, 128};
+const int nios2_num_r2_asi_n_mappings = 8;
+
+/* Decodings for R2 shi.n (slli.n/srli.n) immediate values.  */
+unsigned int nios2_r2_shi_n_mappings[] =
+  {1, 2, 3, 8, 12, 16, 24, 31};
+const int nios2_num_r2_shi_n_mappings = 8;
+
+/* Decodings for R2 andi.n immediate values.  */
+unsigned int nios2_r2_andi_n_mappings[] =
+  {1, 2, 3, 4, 8, 0xf, 0x10, 0x1f,
+   0x20, 0x3f, 0x7f, 0x80, 0xff, 0x7ff, 0xff00, 0xffff};
+const int nios2_num_r2_andi_n_mappings = 16;
+
+/* Decodings for R2 3-bit register fields.  */
+int nios2_r2_reg3_mappings[] =
+  {16, 17, 2, 3, 4, 5, 6, 7};
+const int nios2_num_r2_reg3_mappings = 8;
+
+/* Decodings for R2 push.n/pop.n REG_RANGE value list.  */
+unsigned long nios2_r2_reg_range_mappings[] = {
+  0x00010000,
+  0x00030000,
+  0x00070000,
+  0x000f0000,
+  0x001f0000,
+  0x003f0000,
+  0x007f0000,
+  0x00ff0000
+};
+const int nios2_num_r2_reg_range_mappings = 8;
-- 
2.30.2