Add support fpr MAXQ processor

7 files changed, 752 insertions, 19 deletions

diff --git a/opcodes/Makefile.am b/opcodes/Makefile.am
index b7d4cba..eb2ee2d 100644
--- a/opcodes/Makefile.am
+++ b/opcodes/Makefile.am
@@ -116,6 +116,7 @@ CFILES = \
 	m68k-dis.c \
 	m68k-opc.c \
 	m88k-dis.c \
+	maxq-dis.c \
 	mcore-dis.c \
 	mips-dis.c \
 	mips-opc.c \
@@ -233,6 +234,7 @@ ALL_MACHINES = \
 	m10200-opc.lo \
 	m10300-dis.lo \
 	m10300-opc.lo \
+	maxq-dis.lo \
 	mcore-dis.lo \
 	mips-dis.lo \
 	mips-opc.lo \
@@ -717,6 +719,8 @@ m68k-opc.lo: m68k-opc.c sysdep.h config.h $(INCDIR)/ansidecl.h \
 m88k-dis.lo: m88k-dis.c sysdep.h config.h $(INCDIR)/ansidecl.h \
   $(INCDIR)/dis-asm.h $(BFD_H) $(INCDIR)/symcat.h $(INCDIR)/opcode/m88k.h \
   opintl.h $(INCDIR)/libiberty.h
+maxq-dis.lo: maxq-dis.c sysdep.h config.h $(INCDIR)/opcode/maxq.h \
+  $(INCDIR)/dis-asm.h $(BFD_H) $(INCDIR)/symcat.h
 mcore-dis.lo: mcore-dis.c sysdep.h config.h $(INCDIR)/ansidecl.h \
   mcore-opc.h $(INCDIR)/dis-asm.h $(BFD_H) $(INCDIR)/symcat.h
 mips-dis.lo: mips-dis.c sysdep.h config.h $(INCDIR)/ansidecl.h \
diff --git a/opcodes/Makefile.in b/opcodes/Makefile.in
index 19aee60..614fe82 100644
--- a/opcodes/Makefile.in
+++ b/opcodes/Makefile.in
@@ -1,4 +1,4 @@
-# Makefile.in generated by automake 1.9.1 from Makefile.am.
+# Makefile.in generated by automake 1.9.2 from Makefile.am.
 # @configure_input@
 
 # Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
@@ -338,6 +338,7 @@ CFILES = \
 	m68k-dis.c \
 	m68k-opc.c \
 	m88k-dis.c \
+	maxq-dis.c \
 	mcore-dis.c \
 	mips-dis.c \
 	mips-opc.c \
@@ -455,6 +456,7 @@ ALL_MACHINES = \
 	m10200-opc.lo \
 	m10300-dis.lo \
 	m10300-opc.lo \
+	maxq-dis.lo \
 	mcore-dis.lo \
 	mips-dis.lo \
 	mips-opc.lo \
@@ -565,15 +567,15 @@ $(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__confi
 	@for dep in $?; do \
 	  case '$(am__configure_deps)' in \
 	    *$$dep*) \
-	      echo ' cd $(srcdir) && $(AUTOMAKE) --cygnus '; \
-	      cd $(srcdir) && $(AUTOMAKE) --cygnus  \
+	      echo ' cd $(srcdir) && $(AUTOMAKE) --foreign '; \
+	      cd $(srcdir) && $(AUTOMAKE) --foreign  \
 		&& exit 0; \
 	      exit 1;; \
 	  esac; \
 	done; \
-	echo ' cd $(top_srcdir) && $(AUTOMAKE) --cygnus  Makefile'; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign  Makefile'; \
 	cd $(top_srcdir) && \
-	  $(AUTOMAKE) --cygnus  Makefile
+	  $(AUTOMAKE) --foreign  Makefile
 .PRECIOUS: Makefile
 Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
 	@case '$?' in \
@@ -1247,6 +1249,8 @@ m68k-opc.lo: m68k-opc.c sysdep.h config.h $(INCDIR)/ansidecl.h \
 m88k-dis.lo: m88k-dis.c sysdep.h config.h $(INCDIR)/ansidecl.h \
   $(INCDIR)/dis-asm.h $(BFD_H) $(INCDIR)/symcat.h $(INCDIR)/opcode/m88k.h \
   opintl.h $(INCDIR)/libiberty.h
+maxq-dis.lo: maxq-dis.c sysdep.h config.h $(INCDIR)/opcode/maxq.h \
+  $(INCDIR)/dis-asm.h $(BFD_H) $(INCDIR)/symcat.h
 mcore-dis.lo: mcore-dis.c sysdep.h config.h $(INCDIR)/ansidecl.h \
   mcore-opc.h $(INCDIR)/dis-asm.h $(BFD_H) $(INCDIR)/symcat.h
 mips-dis.lo: mips-dis.c sysdep.h config.h $(INCDIR)/ansidecl.h \
diff --git a/opcodes/aclocal.m4 b/opcodes/aclocal.m4
index 49e8d5b..211f208 100644
--- a/opcodes/aclocal.m4
+++ b/opcodes/aclocal.m4
@@ -1,4 +1,4 @@
-# generated automatically by aclocal 1.9.1 -*- Autoconf -*-
+# generated automatically by aclocal 1.9.2 -*- Autoconf -*-
 
 # Copyright (C) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004
 # Free Software Foundation, Inc.
@@ -40,7 +40,7 @@ AC_DEFUN([AM_AUTOMAKE_VERSION], [am__api_version="1.9"])
 # Call AM_AUTOMAKE_VERSION so it can be traced.
 # This function is AC_REQUIREd by AC_INIT_AUTOMAKE.
 AC_DEFUN([AM_SET_CURRENT_AUTOMAKE_VERSION],
-	 [AM_AUTOMAKE_VERSION([1.9.1])])
+	 [AM_AUTOMAKE_VERSION([1.9.2])])
 
 # AM_AUX_DIR_EXPAND
 
diff --git a/opcodes/configure b/opcodes/configure
index c803c94..05e49e6 100755
--- a/opcodes/configure
+++ b/opcodes/configure
@@ -8617,6 +8617,7 @@ if test x${all_targets} = xfalse ; then
 	bfd_m68hc12_arch)	ta="$ta m68hc11-dis.lo m68hc11-opc.lo" ;;
 	bfd_m68k_arch)		ta="$ta m68k-dis.lo m68k-opc.lo" ;;
 	bfd_m88k_arch)		ta="$ta m88k-dis.lo" ;;
+	bfd_maxq_arch)		ta="$ta maxq-dis.lo" ;;
 	bfd_mcore_arch)		ta="$ta mcore-dis.lo" ;;
 	bfd_mips_arch)		ta="$ta mips-dis.lo mips-opc.lo mips16-opc.lo" ;;
 	bfd_mmix_arch)		ta="$ta mmix-dis.lo mmix-opc.lo" ;;
diff --git a/opcodes/configure.in b/opcodes/configure.in
index 8c165fc..bbe5aa3 100644
--- a/opcodes/configure.in
+++ b/opcodes/configure.in
@@ -198,6 +198,7 @@ if test x${all_targets} = xfalse ; then
 	bfd_m68hc12_arch)	ta="$ta m68hc11-dis.lo m68hc11-opc.lo" ;;
 	bfd_m68k_arch)		ta="$ta m68k-dis.lo m68k-opc.lo" ;;
 	bfd_m88k_arch)		ta="$ta m88k-dis.lo" ;;
+	bfd_maxq_arch)		ta="$ta maxq-dis.lo" ;;
 	bfd_mcore_arch)		ta="$ta mcore-dis.lo" ;;
 	bfd_mips_arch)		ta="$ta mips-dis.lo mips-opc.lo mips16-opc.lo" ;;
 	bfd_mmix_arch)		ta="$ta mmix-dis.lo mmix-opc.lo" ;;
diff --git a/opcodes/disassemble.c b/opcodes/disassemble.c
index 1bcd322..19de8f6 100644
--- a/opcodes/disassemble.c
+++ b/opcodes/disassemble.c
@@ -1,20 +1,20 @@
 /* Select disassembly routine for specified architecture.
-   Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
+   Copyright 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2004
    Free Software Foundation, Inc.
 
-This program 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 2 of the License, or
-(at your option) any later version.
+   This program 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 2 of the License, or
+   (at your option) any later version.
 
-This program 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.
+   This program 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 this program; if not, write to the Free Software
-Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 
 #include "sysdep.h"
 #include "dis-asm.h"
@@ -45,6 +45,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
 #define ARCH_m68hc11
 #define ARCH_m68hc12
 #define ARCH_m88k
+#define ARCH_maxq
 #define ARCH_mcore
 #define ARCH_mips
 #define ARCH_mmix
@@ -227,6 +228,11 @@ disassembler (abfd)
       disassemble = print_insn_m88k;
       break;
 #endif
+#ifdef ARCH_maxq
+    case bfd_arch_maxq:
+      disassemble = print_insn_maxq_little;
+      break;
+#endif
 #ifdef ARCH_msp430
     case bfd_arch_msp430:
       disassemble = print_insn_msp430;
diff --git a/opcodes/maxq-dis.c b/opcodes/maxq-dis.c
new file mode 100644
index 0000000..b3a7c46
--- /dev/null
+++ b/opcodes/maxq-dis.c
@@ -0,0 +1,717 @@
+/* Instruction printing code for the MAXQ
+
+   Copyright 2004 Free Software Foundation, Inc.
+
+   Written by Vineet Sharma(vineets@noida.hcltech.com) Inderpreet
+   S.(inderpreetb@noida.hcltech.com)
+
+   This file is part of GDB.
+
+   This program 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 2 of the License, or (at your option)
+   any later version.
+
+   This program 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 this program; if not, write to the Free Software Foundation, Inc., 59 
+   Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
+
+#include "sysdep.h"
+#include "dis-asm.h"
+#include "opcode/maxq.h"
+
+struct _group_info
+{
+  unsigned char group_no;
+  unsigned char sub_opcode;
+  unsigned char src;
+  unsigned char dst;
+  unsigned char fbit;
+  unsigned char bit_no;
+  unsigned char flag;
+
+};
+
+typedef struct _group_info group_info;
+
+#define SRC	0x01
+#define DST	0x02
+#define FORMAT	0x04
+#define BIT_NO	0x08
+#define SUB_OP	0x10
+
+#define MASK_LOW_BYTE 0x0f
+#define MASK_HIGH_BYTE 0xf0
+
+/* Flags for retrieving the bits from the op-code.  */
+#define _DECODE_LOWNIB_LOWBYTE  0x000f
+#define _DECODE_HIGHNIB_LOWBYTE 0x00f0
+#define _DECODE_LOWNIB_HIGHBYTE 0x0f00
+#define _DECODE_HIGHNIB_HIGHBYTE 0xf000
+#define _DECODE_HIGHBYTE 0xff00
+#define _DECODE_LOWBYTE  0x00ff
+#define _DECODE_4TO6_HIGHBYTE 0x7000
+#define _DECODE_4TO6_LOWBYTE 0x0070
+#define _DECODE_0TO6_HIGHBYTE 0x7f00
+#define _DECODE_0TO2_HIGHBYTE 0x0700
+#define _DECODE_GET_F_HIGHBYTE 0x8000
+#define _DECODE_BIT7_HIGHBYTE 0x8000
+#define _DECODE_BIT7_LOWBYTE 0x0080
+#define _DECODE_GET_CARRY 0x10000
+#define _DECODE_BIT0_LOWBYTE 0x1
+#define _DECODE_BIT6AND7_HIGHBYTE 0xc000
+
+/* Module and Register Indexed of System Registers.  */
+#define _CURR_ACC_MODINDEX 0xa
+#define _CURR_ACC_REGINDEX 0x0
+#define _PSF_REG_MODINDEX  0x8
+#define _PSF_REG_REGINDEX  0x4
+#define _PFX_REG_MODINDEX  0xb
+#define _PFX0_REG_REGINDEX 0x0
+#define _PFX2_REG_REGINDEX 0x2
+#define _DP_REG_MODINDEX   0xf
+#define _DP0_REG_REGINDEX  0x3
+#define _DP1_REG_REGINDEX  0x7
+#define _IP_REG_MODINDEX   0xc
+#define _IP_REG_REGINDEX   0x0
+#define _IIR_REG_MODINDEX  0x8
+#define _IIR_REG_REGINDEX  0xb
+#define _SP_REG_MODINDEX   0xd
+#define _SP_REG_REGINDEX   0x1
+#define _IC_REG_MODINDEX   0x8
+#define _IC_REG_REGINDEX   0x5
+#define _LC_REG_MODINDEX   0xe
+#define _LC0_REG_REGINDEX  0x0
+#define _LC1_REG_REGINDEX  0x1
+#define _LC2_REG_REGINDEX  0x2
+#define _LC3_REG_REGINDEX  0x3
+
+/* Flags for finding the bits in PSF Register.  */
+#define SIM_ALU_DECODE_CARRY_BIT_POS  0x2
+#define SIM_ALU_DECODE_SIGN_BIT_POS   0x40
+#define SIM_ALU_DECODE_ZERO_BIT_POS   0x80
+#define SIM_ALU_DECODE_EQUAL_BIT_POS  0x1
+#define SIM_ALU_DECODE_IGE_BIT_POS    0x1
+
+/* Number Of Op-code Groups.  */
+unsigned char const SIM_ALU_DECODE_OPCODE_GROUPS = 11;
+
+/* Op-code Groups.  */
+unsigned char const SIM_ALU_DECODE_LOGICAL_XCHG_OP_GROUP = 1;
+
+/* Group1: AND/OR/XOR/ADD/SUB Operations: fxxx 1010 ssss ssss.  */
+unsigned char const SIM_ALU_DECODE_AND_OR_ADD_SUB_OP_GROUP = 2;
+
+/* Group2: Logical Operations: 1000 1010 xxxx 1010.  */
+unsigned char const SIM_ALU_DECODE_BIT_OP_GROUP = 3;
+
+/* XCHG/Bit Operations: 1xxx 1010 xxxx 1010.  */
+unsigned char const SIM_ALU_DECODE_SET_DEST_BIT_GROUP = 4;
+
+/* Move value in bit of destination register: 1ddd dddd xbbb 0111.  */
+unsigned char const SIM_ALU_DECODE_JUMP_OP_GROUP = 5;
+
+#define JUMP_CHECK(insn)   \
+   (   ((insn & _DECODE_4TO6_HIGHBYTE) == 0x0000) \
+    || ((insn & _DECODE_4TO6_HIGHBYTE) == 0x2000) \
+    || ((insn & _DECODE_4TO6_HIGHBYTE) == 0x6000) \
+    || ((insn & _DECODE_4TO6_HIGHBYTE) == 0x1000) \
+    || ((insn & _DECODE_4TO6_HIGHBYTE) == 0x5000) \
+    || ((insn & _DECODE_4TO6_HIGHBYTE) == 0x3000) \
+    || ((insn & _DECODE_4TO6_HIGHBYTE) == 0x7000) \
+    || ((insn & _DECODE_4TO6_HIGHBYTE) == 0x4000) )
+
+/* JUMP operations: fxxx 1100 ssss ssss */
+unsigned char const SIM_ALU_DECODE_RET_OP_GROUP = 6;
+
+/* RET Operations: 1xxx 1100 0000 1101 */
+unsigned char const SIM_ALU_DECODE_MOVE_SRC_DST_GROUP = 7;
+
+/* Move src into dest register: fddd dddd ssss ssss */
+unsigned char const SIM_ALU_DECODE_SET_SRC_BIT_GROUP = 8;
+
+/* Move value in bit of source register: fbbb 0111 ssss ssss */
+unsigned char const SIM_ALU_DECODE_DJNZ_CALL_PUSH_OP_GROUP = 9;
+
+/* PUSH, DJNZ and CALL operations: fxxx 1101 ssss ssss */
+unsigned char const SIM_ALU_DECODE_POP_OP_GROUP = 10;
+
+/* POP operation: 1ddd dddd 0000 1101 */
+unsigned char const SIM_ALU_DECODE_CMP_SRC_OP_GROUP = 11;
+
+/* GLOBAL */
+unsigned char unres_reg_name[20];
+
+static unsigned char *
+get_reg_name (unsigned char reg_code, type1 arg_pos)
+{
+  unsigned char module;
+  unsigned char index;
+  int ix = 0;
+  reg_entry const *reg_x;
+  mem_access_syntax const *syntax;
+  mem_access *mem_acc;
+
+  module = 0;
+  index = 0;
+  module = (reg_code & MASK_LOW_BYTE);
+  index = (reg_code & MASK_HIGH_BYTE);
+  index = index >> 4;
+
+  /* Search the system register table.  */
+  for (reg_x = &system_reg_table[0]; reg_x->reg_name != NULL; ++reg_x)
+    if ((reg_x->Mod_name == module) && (reg_x->Mod_index == index))
+      return reg_x->reg_name;
+
+  /* Serch pheripheral table.  */
+  for (ix = 0; ix < num_of_reg; ix++)
+    {
+      reg_x = &new_reg_table[ix];
+
+      if ((reg_x->Mod_name == module) && (reg_x->Mod_index == index))
+	return reg_x->reg_name;
+    }
+
+  for (mem_acc = &mem_table[0]; mem_acc->name != NULL || !mem_acc; ++mem_acc)
+    {
+      if (reg_code == mem_acc->opcode)
+	{
+	  for (syntax = mem_access_syntax_table;
+	       mem_access_syntax_table != NULL || mem_access_syntax_table->name;
+	       ++syntax)
+	    if (!strcmp (mem_acc->name, syntax->name))
+	      {
+		if ((arg_pos == syntax->type) || (syntax->type == BOTH))
+		  return mem_acc->name;
+
+		break;
+	      }
+	}
+    }
+
+  memset (unres_reg_name, 0, 20);
+  sprintf (unres_reg_name, "%01x%01xh", index, module);
+
+  return unres_reg_name;
+}
+
+static bfd_boolean
+check_move (unsigned char insn0, unsigned char insn8)
+{
+  bfd_boolean first = FALSE;
+  bfd_boolean second = FALSE;
+  char *first_reg;
+  char *second_reg;
+  reg_entry const *reg_x;
+  const unsigned char module1 = insn0 & MASK_LOW_BYTE;
+  const unsigned char index1 = ((insn0 & 0x70) >> 4);
+  const unsigned char module2 = insn8 & MASK_LOW_BYTE;
+  const unsigned char index2 = ((insn8 & MASK_HIGH_BYTE) >> 4);
+
+  /* DST */
+  if (((insn0 & MASK_LOW_BYTE) == MASK_LOW_BYTE)
+      && ((index1 == 0) || (index1 == 1) || (index1 == 2) || (index1 == 5)
+	  || (index1 == 4) || (index1 == 6)))
+    first = TRUE;
+
+  else if (((insn0 & MASK_LOW_BYTE) == 0x0D) && (index1 == 0))
+    first = TRUE;
+
+  else if ((module1 == 0x0E)
+	   && ((index1 == 0) || (index1 == 1) || (index1 == 2)))
+    first = TRUE;
+
+  else
+    {
+      for (reg_x = &system_reg_table[0]; reg_x->reg_name != NULL && reg_x;
+	   ++reg_x)
+	{
+	  if ((reg_x->Mod_name == module1) && (reg_x->Mod_index == index1)
+	      && ((reg_x->rtype == Reg_16W) || (reg_x->rtype == Reg_8W)))
+	    {
+	      /* IP not allowed.  */
+	      if ((reg_x->Mod_name == 0x0C) && (reg_x->Mod_index == 0x00))
+		continue;
+
+	      /* A[AP] not allowed.  */
+	      if ((reg_x->Mod_name == 0x0A) && (reg_x->Mod_index == 0x01))
+		continue;
+	      first_reg = reg_x->reg_name;
+	      first = TRUE;
+	      break;
+	    }
+	}
+    }
+
+  if (!first)
+    /* No need to check further.  */
+    return FALSE;
+
+  if (insn0 & 0x80)
+    {
+      /* SRC */
+      if (((insn8 & MASK_LOW_BYTE) == MASK_LOW_BYTE)
+	  && ((index2 == 0) || (index2 == 1) || (index2 == 2) || (index2 == 4)
+	      || (index2 == 5) || (index2 == 6)))
+	second = TRUE;
+
+      else if (((insn8 & MASK_LOW_BYTE) == 0x0D) && (index2 == 0))
+	second = TRUE;
+
+      else if ((module2 == 0x0E)
+	       && ((index2 == 0) || (index2 == 1) || (index2 == 2)))
+	second = TRUE;
+
+      else
+	{
+	  for (reg_x = &system_reg_table[0];
+	       reg_x->reg_name != NULL && reg_x;
+	       ++reg_x)
+	    {
+	      if ((reg_x->Mod_name == (insn8 & MASK_LOW_BYTE))
+		  && (reg_x->Mod_index == (((insn8 & 0xf0) >> 4))))
+		{
+		  second = TRUE;
+		  second_reg = reg_x->reg_name;
+		  break;
+		}
+	    }
+	}	
+
+      if (second)
+	{
+	  if ((module1 == 0x0A && index1 == 0x0)
+	      && (module2 == 0x0A && index2 == 0x01))
+	    return FALSE;
+
+	  return TRUE;
+	}
+
+      return FALSE;
+    }
+
+  return first;
+}
+
+static void
+maxq_print_arg (MAX_ARG_TYPE              arg,
+		struct disassemble_info * info,
+		group_info                grp)
+{
+  switch (arg)
+    {
+    case FLAG_C:
+      info->fprintf_func (info->stream, "C");
+      break;
+    case FLAG_NC:
+      info->fprintf_func (info->stream, "NC");
+      break;
+
+    case FLAG_Z:
+      info->fprintf_func (info->stream, "Z");
+      break;
+
+    case FLAG_NZ:
+      info->fprintf_func (info->stream, "NZ");
+      break;
+
+    case FLAG_S:
+      info->fprintf_func (info->stream, "S");
+      break;
+
+    case FLAG_E:
+      info->fprintf_func (info->stream, "E");
+      break;
+
+    case FLAG_NE:
+      info->fprintf_func (info->stream, "NE");
+      break;
+
+    case ACC_BIT:
+      info->fprintf_func (info->stream, "Acc");
+      if ((grp.flag & BIT_NO) == BIT_NO)
+	info->fprintf_func (info->stream, ".%d", grp.bit_no);
+      break;
+
+    case A_BIT_0:
+      info->fprintf_func (info->stream, "#0");
+      break;
+    case A_BIT_1:
+      info->fprintf_func (info->stream, "#1");
+      break;
+
+    default:
+      break;
+    }
+}
+
+static unsigned char
+get_group (const unsigned int insn)
+{
+  if (check_move ((insn >> 8), (insn & _DECODE_LOWBYTE)))
+    return 8;
+
+  if ((insn & _DECODE_LOWNIB_HIGHBYTE) == 0x0A00)
+    {
+      /* && condition with sec part added on 26 May for resoveing 2 & 3 grp
+         conflict.  */
+      if (((insn & _DECODE_LOWNIB_LOWBYTE) == 0x000A)
+	  && ((insn & _DECODE_GET_F_HIGHBYTE) == 0x8000))
+	{
+	  if ((insn & _DECODE_HIGHNIB_HIGHBYTE) == 0x8000)
+	    return 2;
+	  else
+	    return 3;
+	}
+
+      return 1;
+    }
+  else if ((insn & _DECODE_LOWNIB_HIGHBYTE) == 0x0C00)
+    {
+      if (((insn & _DECODE_LOWBYTE) == 0x000D) && JUMP_CHECK (insn)
+	  && ((insn & _DECODE_GET_F_HIGHBYTE) == 0x8000))
+	return 6;
+      else if ((insn & _DECODE_LOWBYTE) == 0x008D)
+	return 7;
+
+      return 5;
+    }
+  else if (((insn & _DECODE_LOWNIB_HIGHBYTE) == 0x0D00)
+	   && (((insn & _DECODE_4TO6_HIGHBYTE) == 0x3000)
+	       || ((insn & _DECODE_4TO6_HIGHBYTE) == 0x4000)
+	       || ((insn & _DECODE_4TO6_HIGHBYTE) == 0x5000)
+	       || ((insn & _DECODE_4TO6_HIGHBYTE) == 0x0000)))
+    return 10;
+
+  else if ((insn & _DECODE_LOWBYTE) == 0x000D)
+    return 11;
+
+  else if ((insn & _DECODE_LOWBYTE) == 0x008D)
+    return 12;
+
+  else if ((insn & _DECODE_0TO6_HIGHBYTE) == 0x7800)
+    return 13;
+
+  else if ((insn & _DECODE_LOWNIB_HIGHBYTE) == 0x0700)
+    return 9;
+
+  else if (((insn & _DECODE_LOWNIB_LOWBYTE) == 0x0007)
+	   && ((insn & _DECODE_GET_F_HIGHBYTE) == 0x8000))
+    return 4;
+
+  return 8;
+}
+
+static void
+get_insn_opcode (const unsigned int insn, group_info *i)
+{
+  static unsigned char pfx_flag = 0;
+  static unsigned char count_for_pfx = 0;
+
+  i->flag ^= i->flag;
+  i->bit_no ^= i->bit_no;
+  i->dst ^= i->dst;
+  i->fbit ^= i->fbit;
+  i->group_no ^= i->group_no;
+  i->src ^= i->src;
+  i->sub_opcode ^= i->sub_opcode;
+
+  if (count_for_pfx > 0)
+    count_for_pfx++;
+
+  if (((insn >> 8) == 0x0b) || ((insn >> 8) == 0x2b))
+    {
+      pfx_flag = 1;
+      count_for_pfx = 1;
+    }
+
+  i->group_no = get_group (insn);
+
+  if (pfx_flag && (i->group_no == 0x0D) && (count_for_pfx == 2)
+      && ((insn & _DECODE_0TO6_HIGHBYTE) == 0x7800))
+    {
+      i->group_no = 0x08;
+      count_for_pfx = 0;
+      pfx_flag ^= pfx_flag;
+    }
+
+  switch (i->group_no)
+    {
+    case 1:
+      i->sub_opcode = ((insn & _DECODE_4TO6_HIGHBYTE) >> 12);
+      i->flag |= SUB_OP;
+      i->src = ((insn & _DECODE_LOWBYTE));
+      i->flag |= SRC;
+      i->fbit = ((insn & _DECODE_GET_F_HIGHBYTE) >> 15);
+      i->flag |= FORMAT;
+      break;
+
+    case 2:
+      i->sub_opcode = ((insn & _DECODE_HIGHNIB_LOWBYTE) >> 4);
+      i->flag |= SUB_OP;
+      break;
+
+    case 3:
+      i->sub_opcode = ((insn & _DECODE_HIGHNIB_HIGHBYTE) >> 12);
+      i->flag |= SUB_OP;
+      i->bit_no = ((insn & _DECODE_HIGHNIB_LOWBYTE) >> 4);
+      i->flag |= BIT_NO;
+      break;
+
+    case 4:
+      i->sub_opcode = ((insn & _DECODE_BIT7_LOWBYTE) >> 7);
+      i->flag |= SUB_OP;
+      i->dst = ((insn & _DECODE_0TO6_HIGHBYTE) >> 8);
+      i->flag |= DST;
+      i->bit_no = ((insn & _DECODE_4TO6_LOWBYTE) >> 4);
+      i->flag |= BIT_NO;
+      break;
+
+    case 5:
+      i->sub_opcode = ((insn & _DECODE_4TO6_HIGHBYTE) >> 12);
+      i->flag |= SUB_OP;
+      i->src = ((insn & _DECODE_LOWBYTE));
+      i->flag |= SRC;
+      i->fbit = ((insn & _DECODE_GET_F_HIGHBYTE) >> 15);
+      i->flag |= FORMAT;
+      break;
+
+    case 6:
+      i->sub_opcode = ((insn & _DECODE_HIGHNIB_HIGHBYTE) >> 12);
+      i->flag |= SUB_OP;
+      break;
+
+    case 7:
+      i->sub_opcode = ((insn & _DECODE_HIGHNIB_HIGHBYTE) >> 12);
+      i->flag |= SUB_OP;
+      break;
+
+    case 8:
+      i->dst = ((insn & _DECODE_0TO6_HIGHBYTE) >> 8);
+      i->flag |= DST;
+      i->src = ((insn & _DECODE_LOWBYTE));
+      i->flag |= SRC;
+      i->fbit = ((insn & _DECODE_GET_F_HIGHBYTE) >> 15);
+      i->flag |= FORMAT;
+      break;
+
+    case 9:
+      i->sub_opcode = ((insn & _DECODE_0TO2_HIGHBYTE) >> 8);
+      i->flag |= SUB_OP;
+      i->bit_no = ((insn & _DECODE_4TO6_HIGHBYTE) >> 12);
+      i->flag |= BIT_NO;
+      i->fbit = ((insn & _DECODE_GET_F_HIGHBYTE) >> 15);
+      i->flag |= FORMAT;
+      i->src = ((insn & _DECODE_LOWBYTE));
+      i->flag |= SRC;
+      break;
+
+    case 10:
+      i->sub_opcode = ((insn & _DECODE_4TO6_HIGHBYTE) >> 12);
+      i->flag |= SUB_OP;
+      i->src = ((insn & _DECODE_LOWBYTE));
+      i->flag |= SRC;
+      i->fbit = ((insn & _DECODE_GET_F_HIGHBYTE) >> 15);
+      i->flag |= FORMAT;
+      break;
+
+    case 11:
+      i->dst = ((insn & _DECODE_0TO6_HIGHBYTE) >> 8);
+      i->flag |= DST;
+      break;
+
+    case 12:
+      i->dst = ((insn & _DECODE_0TO6_HIGHBYTE) >> 8);
+      i->flag |= DST;
+      break;
+
+    case 13:
+      i->sub_opcode = ((insn & _DECODE_4TO6_HIGHBYTE) >> 12);
+      i->flag |= SUB_OP;
+      i->src = ((insn & _DECODE_LOWBYTE));
+      i->flag |= SRC;
+      i->fbit = ((insn & _DECODE_GET_F_HIGHBYTE) >> 15);
+      i->flag |= FORMAT;
+      break;
+
+    }
+  return;
+}
+
+
+/* Print one instruction from MEMADDR on INFO->STREAM. Return the size of the 
+   instruction (always 2 on MAXQ20).  */
+
+static int
+print_insn (bfd_vma memaddr, struct disassemble_info *info,
+	    enum bfd_endian endianess)
+{
+  /* The raw instruction.  */
+  unsigned char insn[2], insn0, insn8, derived_code;
+  unsigned int format;
+  unsigned int actual_operands;
+  unsigned int i;
+  /* The group_info collected/decoded.  */
+  group_info grp;
+  MAXQ20_OPCODE_INFO const *opcode;
+  int status;
+
+  format = 0;
+
+  status = info->read_memory_func (memaddr, (bfd_byte *) & insn[0], 2, info);
+
+  if (status != 0)
+    {
+      info->memory_error_func (status, memaddr, info);
+      return -1;
+    }
+
+  insn8 = insn[1];
+  insn0 = insn[0];
+
+  /* FIXME: Endianness always little.  */
+  if (endianess == BFD_ENDIAN_BIG)
+    get_insn_opcode (((insn[0] << 8) | (insn[1])), &grp);
+  else
+    get_insn_opcode (((insn[1] << 8) | (insn[0])), &grp);
+
+  derived_code = ((grp.group_no << 4) | grp.sub_opcode);
+
+  if (insn[0] == 0 && insn[1] == 0)
+    {
+      info->fprintf_func (info->stream, "00 00");
+      return 2;
+    }
+
+  /* The opcode is always in insn0.  */
+  for (opcode = &op_table[0]; opcode->name != NULL; ++opcode)
+    {
+      if (opcode->instr_id == derived_code)
+	{
+	  if (opcode->instr_id == 0x3D)
+	    {
+	      if ((grp.bit_no == 0) && (opcode->arg[1] != A_BIT_0))
+		continue;
+	      if ((grp.bit_no == 1) && (opcode->arg[1] != A_BIT_1))
+		continue;
+	      if ((grp.bit_no == 3) && (opcode->arg[0] != 0))
+		continue;
+	    }
+
+	  info->fprintf_func (info->stream, "%s ", opcode->name);
+
+	  actual_operands = 0;
+
+	  if ((grp.flag & SRC) == SRC)
+	    actual_operands++;
+
+	  if ((grp.flag & DST) == DST)
+	    actual_operands++;
+
+	  /* If Implict FLAG in the Instruction.  */
+	  if ((opcode->op_number > actual_operands)
+	      && !((grp.flag & SRC) == SRC) && !((grp.flag & DST) == DST))
+	    {
+	      for (i = 0; i < opcode->op_number; i++)
+		{
+		  if (i == 1 && (opcode->arg[1] != NO_ARG))
+		    info->fprintf_func (info->stream, ",");
+		  maxq_print_arg (opcode->arg[i], info, grp);
+		}
+	    }
+
+	  /* DST is ABSENT in the grp.  */
+	  if ((opcode->op_number > actual_operands)
+	      && ((grp.flag & SRC) == SRC))
+	    {
+	      maxq_print_arg (opcode->arg[0], info, grp);
+	      info->fprintf_func (info->stream, " ");
+
+	      if (opcode->instr_id == 0xA4)
+		info->fprintf_func (info->stream, "LC[0]");
+
+	      if (opcode->instr_id == 0xA5)
+		info->fprintf_func (info->stream, "LC[1]");
+
+	      if ((grp.flag & SRC) == SRC)
+		info->fprintf_func (info->stream, ",");
+	    }
+
+	  if ((grp.flag & DST) == DST)
+	    {
+	      if ((grp.flag & BIT_NO) == BIT_NO)
+		{
+		  info->fprintf_func (info->stream, " %s.%d",
+				      get_reg_name (grp.dst,
+						    (type1) 0 /*DST*/),
+				      grp.bit_no);
+		}
+	      else
+		info->fprintf_func (info->stream, " %s", get_reg_name (grp.dst, (type1) 0));
+	    }
+
+	  /* SRC is ABSENT in the grp.  */
+	  if ((opcode->op_number > actual_operands)
+	      && ((grp.flag & DST) == DST))
+	    {
+	      info->fprintf_func (info->stream, ",");
+	      maxq_print_arg (opcode->arg[1], info, grp);
+	      info->fprintf_func (info->stream, " ");
+	    }
+
+	  if ((grp.flag & SRC) == SRC)
+	    {
+	      if ((grp.flag & DST) == DST)
+		info->fprintf_func (info->stream, ",");
+
+	      if ((grp.flag & BIT_NO) == BIT_NO)
+		{
+		  format = opcode->format;
+
+		  if ((grp.flag & FORMAT) == FORMAT)
+		    format = grp.fbit;
+		  if (format == 1)
+		    info->fprintf_func (info->stream, " %s.%d",
+					get_reg_name (grp.src,
+						      (type1) 1 /*SRC*/),
+					grp.bit_no);
+		  if (format == 0)
+		    info->fprintf_func (info->stream, " #%02xh.%d",
+					(grp.src, SRC), grp.bit_no);
+		}
+	      else
+		{
+		  format = opcode->format;
+
+		  if ((grp.flag & FORMAT) == FORMAT)
+		    format = grp.fbit;
+		  if (format == 1)
+		    info->fprintf_func (info->stream, " %s",
+					   get_reg_name (grp.src,
+							 (type1) 1 /*SRC*/));
+		  if (format == 0)
+		    info->fprintf_func (info->stream, " #%02xh",
+					   (grp.src));
+		}
+	    }
+
+	  return 2;
+	}
+    }
+
+  info->fprintf_func (info->stream, "Unable to Decode :  %02x %02x",
+			 insn[0], insn[1]);
+  return 2;			
+}
+
+int
+print_insn_maxq_little (bfd_vma memaddr, struct disassemble_info *info)
+{
+  return print_insn (memaddr, info, BFD_ENDIAN_LITTLE);
+}
+