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/* Instruction printing code for the MAXQ

   Copyright 2004, 2005, 2007 Free Software Foundation, Inc.

   Written by Vineet Sharma(vineets@noida.hcltech.com) Inderpreet

   S.(inderpreetb@noida.hcltech.com)

   This file is part of the GNU opcodes library.

   This library 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.

   It 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.,

   51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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 */

char unres_reg_name[20];

static 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;

               syntax != NULL && syntax->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 resolving 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.  */