/src/capstonenext/arch/M680X/M680XDisassembler.c

Source
/* Capstone Disassembly Engine */
/* M680X Backend by Wolfgang Schwotzer <wolfgang.schwotzer@gmx.net> 2017 */

/* ======================================================================== */
/* ================================ INCLUDES ============================== */
/* ======================================================================== */

#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "../../cs_priv.h"
#include "../../utils.h"

#include "../../MCInst.h"
#include "../../MCInstrDesc.h"
#include "../../MCRegisterInfo.h"
#include "M680XInstPrinter.h"
#include "M680XDisassembler.h"
#include "M680XDisassemblerInternals.h"

#ifdef CAPSTONE_HAS_M680X

#ifndef DECL_SPEC
#ifdef _MSC_VER
#define DECL_SPEC __cdecl
#else
#define DECL_SPEC
#endif // _MSC_VER
#endif // DECL_SPEC

/* ======================================================================== */
/* ============================ GENERAL DEFINES =========================== */
/* ======================================================================== */

/* ======================================================================== */
/* =============================== PROTOTYPES ============================= */
/* ======================================================================== */

typedef enum insn_hdlr_id {
  illgl_hid,
  rel8_hid,
  rel16_hid,
  imm8_hid,
  imm16_hid,
  imm32_hid,
  dir_hid,
  ext_hid,
  idxX_hid,
  idxY_hid,
  idx09_hid,
  inh_hid,
  rr09_hid,
  rbits_hid,
  bitmv_hid,
  tfm_hid,
  opidx_hid,
  opidxdr_hid,
  idxX0_hid,
  idxX16_hid,
  imm8rel_hid,
  idxS_hid,
  idxS16_hid,
  idxXp_hid,
  idxX0p_hid,
  idx12_hid,
  idx12s_hid,
  rr12_hid,
  loop_hid,
  index_hid,
  imm8i12x_hid,
  imm16i12x_hid,
  exti12x_hid,
  srt_hid,
  tny_hid,
  dirdir_hid,
  immdir_hid,
  HANDLER_ID_ENDING,
} insn_hdlr_id;

// Access modes for the first 4 operands. If there are more than
// four operands they use the same access mode as the 4th operand.
//
// u: unchanged
// r: (r)read access
// w: (w)write access
// m: (m)odify access (= read + write)
//
typedef enum e_access_mode {

  uuuu,
  rrrr,
  wwww,
  rwww,
  rrrm,
  rmmm,
  wrrr,
  mrrr,
  mwww,
  mmmm,
  mwrr,
  mmrr,
  wmmm,
  rruu,
  muuu,
  ACCESS_MODE_ENDING,
} e_access_mode;

// Access type values are compatible with enum cs_ac_type:
typedef cs_ac_type e_access;
#define UNCHANGED CS_AC_INVALID
#define READ CS_AC_READ
#define WRITE CS_AC_WRITE
#define MODIFY CS_AC_READ_WRITE

/* Properties of one instruction in PAGE1 (without prefix) */
typedef struct inst_page1 {
  unsigned insn : 9; // A value of type m680x_insn
  unsigned handler_id1 : 6; // Type insn_hdlr_id, first instr. handler id
  unsigned handler_id2 : 6; // Type insn_hdlr_id, second instr. handler id
} inst_page1;

/* Properties of one instruction in any other PAGE X */
typedef struct inst_pageX {
  unsigned opcode : 8; // The opcode byte
  unsigned insn : 9; // A value of type m680x_insn
  unsigned handler_id1 : 6; // Type insn_hdlr_id, first instr. handler id
  unsigned handler_id2 : 6; // Type insn_hdlr_id, second instr. handler id
} inst_pageX;

typedef struct insn_props {
  unsigned group : 4;
  unsigned access_mode : 5; // A value of type e_access_mode
  unsigned reg0 : 5; // A value of type m680x_reg
  unsigned reg1 : 5; // A value of type m680x_reg
  bool cc_modified : 1;
  bool update_reg_access : 1;
} insn_props;

#include "m6800.inc"
#include "m6801.inc"
#include "hd6301.inc"
#include "m6811.inc"
#include "cpu12.inc"
#include "m6805.inc"
#include "m6808.inc"
#include "hcs08.inc"
#include "m6809.inc"
#include "hd6309.inc"
#include "rs08.inc"
#include "hcs12x.inc"

#include "insn_props.inc"

//////////////////////////////////////////////////////////////////////////////

// M680X instructions have 1 up to 8 bytes (CPU12: MOVW IDX2,IDX2).
// A reader is needed to read a byte or word from a given memory address.
// See also X86 reader(...)
static bool read_byte(const m680x_info *info, uint8_t *byte, uint16_t address)
{
  if (address < info->offset ||
      (uint32_t)(address - info->offset) >= info->size)
    // out of code buffer range
    return false;

  *byte = info->code[address - info->offset];

  return true;
}

static bool read_byte_sign_extended(const m680x_info *info, int16_t *word,
            uint16_t address)
{
  if (address < info->offset ||
      (uint32_t)(address - info->offset) >= info->size)
    // out of code buffer range
    return false;

  *word = (int16_t)info->code[address - info->offset];

  if (*word & 0x80)
    *word |= 0xFF00;

  return true;
}

static bool read_word(const m680x_info *info, uint16_t *word, uint16_t address)
{
  if (address < info->offset ||
      (uint32_t)(address + 1 - info->offset) >= info->size)
    // out of code buffer range
    return false;

  *word = (uint16_t)info->code[address - info->offset] << 8;
  *word |= (uint16_t)info->code[address + 1 - info->offset];

  return true;
}

static bool read_sdword(const m680x_info *info, int32_t *sdword,
      uint16_t address)
{
  if (address < info->offset ||
      (uint32_t)(address + 3 - info->offset) >= info->size)
    // out of code buffer range
    return false;

  *sdword = (uint32_t)info->code[address - info->offset] << 24;
  *sdword |= (uint32_t)info->code[address + 1 - info->offset] << 16;
  *sdword |= (uint32_t)info->code[address + 2 - info->offset] << 8;
  *sdword |= (uint32_t)info->code[address + 3 - info->offset];

  return true;
}

// For PAGE2 and PAGE3 opcodes when using an array of inst_page1 most
// entries have M680X_INS_ILLGL. To avoid wasting memory an inst_pageX is
// used which contains the opcode. Using a binary search for the right opcode
// is much faster (= O(log n) ) in comparison to a linear search ( = O(n) ).
static int binary_search(const inst_pageX *const inst_pageX_table,
       size_t table_size, unsigned int opcode)
{
  // As part of the algorithm last may get negative.
  // => signed integer has to be used.
  int first = 0;
  int last = (int)table_size - 1;
  int middle = (first + last) / 2;

  while (first <= last) {
    if (inst_pageX_table[middle].opcode < opcode) {
      first = middle + 1;
    } else if (inst_pageX_table[middle].opcode == opcode) {
      return middle; /* item found */
    } else
      last = middle - 1;

    middle = (first + last) / 2;
  }

  if (first > last)
    return -1; /* item not found */

  return -2;
}

void M680X_get_insn_id(cs_struct *handle, cs_insn *insn, unsigned int id)
{
  const m680x_info *const info = (const m680x_info *)handle->printer_info;
  const cpu_tables *cpu = info->cpu;
  uint8_t insn_prefix = (id >> 8) & 0xff;
  // opcode is the first instruction byte without the prefix.
  uint8_t opcode = id & 0xff;
  int index;
  int i;

  insn->id = M680X_INS_ILLGL;

  for (i = 0; i < ARR_SIZE(cpu->pageX_prefix); ++i) {
    if (cpu->pageX_table_size[i] == 0 ||
        (cpu->inst_pageX_table[i] == NULL))
      break;

    if (cpu->pageX_prefix[i] == insn_prefix) {
      index = binary_search(cpu->inst_pageX_table[i],
                cpu->pageX_table_size[i], opcode);
      insn->id =
        (index >= 0) ?
          cpu->inst_pageX_table[i][index].insn :
          M680X_INS_ILLGL;
      return;
    }
  }

  if (insn_prefix != 0)
    return;

  insn->id = cpu->inst_page1_table[id].insn;

  if (insn->id != M680X_INS_ILLGL)
    return;

  // Check if opcode byte is present in an overlay table
  for (i = 0; i < ARR_SIZE(cpu->overlay_table_size); ++i) {
    if (cpu->overlay_table_size[i] == 0 ||
        (cpu->inst_overlay_table[i] == NULL))
      break;

    if ((index = binary_search(cpu->inst_overlay_table[i],
             cpu->overlay_table_size[i],
             opcode)) >= 0) {
      insn->id = cpu->inst_overlay_table[i][index].insn;
      return;
    }
  }
}

static void add_insn_group(cs_detail *detail, m680x_group_type group)
{
  if (detail != NULL && (group != M680X_GRP_INVALID) &&
      (group != M680X_GRP_ENDING))
    detail->groups[detail->groups_count++] = (uint8_t)group;
}

static bool exists_reg_list(uint16_t *regs, uint8_t count, m680x_reg reg)
{
  uint8_t i;

  for (i = 0; i < count; ++i) {
    if (regs[i] == (uint16_t)reg)
      return true;
  }

  return false;
}

static void add_reg_to_rw_list(MCInst *MI, m680x_reg reg, e_access access)
{
  cs_detail *detail = MI->flat_insn->detail;

  if (detail == NULL || (reg == M680X_REG_INVALID))
    return;

  switch (access) {
  case MODIFY:
    if (!exists_reg_list(detail->regs_read, detail->regs_read_count,
             reg))
      detail->regs_read[detail->regs_read_count++] =
        (uint16_t)reg;

    // intentionally fall through

  case WRITE:
    if (!exists_reg_list(detail->regs_write,
             detail->regs_write_count, reg))
      detail->regs_write[detail->regs_write_count++] =
        (uint16_t)reg;

    break;

  case READ:
    if (!exists_reg_list(detail->regs_read, detail->regs_read_count,
             reg))
      detail->regs_read[detail->regs_read_count++] =
        (uint16_t)reg;

    break;

  case UNCHANGED:
  default:
    break;
  }
}

static void update_am_reg_list(MCInst *MI, m680x_info *info, cs_m680x_op *op,
             e_access access)
{
  if (MI->flat_insn->detail == NULL)
    return;

  switch (op->type) {
  case M680X_OP_REGISTER:
    add_reg_to_rw_list(MI, op->reg, access);
    break;

  case M680X_OP_INDEXED:
    add_reg_to_rw_list(MI, op->idx.base_reg, READ);

    if (op->idx.base_reg == M680X_REG_X &&
        info->cpu->reg_byte_size[M680X_REG_H])
      add_reg_to_rw_list(MI, M680X_REG_H, READ);

    if (op->idx.offset_reg != M680X_REG_INVALID)
      add_reg_to_rw_list(MI, op->idx.offset_reg, READ);

    if (op->idx.inc_dec) {
      add_reg_to_rw_list(MI, op->idx.base_reg, WRITE);

      if (op->idx.base_reg == M680X_REG_X &&
          info->cpu->reg_byte_size[M680X_REG_H])
        add_reg_to_rw_list(MI, M680X_REG_H, WRITE);
    }

    break;

  default:
    break;
  }
}

static const e_access g_access_mode_to_access[4][15] = {
  {
    UNCHANGED,
    READ,
    WRITE,
    READ,
    READ,
    READ,
    WRITE,
    MODIFY,
    MODIFY,
    MODIFY,
    MODIFY,
    MODIFY,
    WRITE,
    READ,
    MODIFY,
  },
  {
    UNCHANGED,
    READ,
    WRITE,
    WRITE,
    READ,
    MODIFY,
    READ,
    READ,
    WRITE,
    MODIFY,
    WRITE,
    MODIFY,
    MODIFY,
    READ,
    UNCHANGED,
  },
  {
    UNCHANGED,
    READ,
    WRITE,
    WRITE,
    READ,
    MODIFY,
    READ,
    READ,
    WRITE,
    MODIFY,
    READ,
    READ,
    MODIFY,
    UNCHANGED,
    UNCHANGED,
  },
  {
    UNCHANGED,
    READ,
    WRITE,
    WRITE,
    MODIFY,
    MODIFY,
    READ,
    READ,
    WRITE,
    MODIFY,
    READ,
    READ,
    MODIFY,
    UNCHANGED,
    UNCHANGED,
  },
};

static e_access get_access(int operator_index, e_access_mode access_mode)
{
  int idx = (operator_index > 3) ? 3 : operator_index;

  return g_access_mode_to_access[idx][access_mode];
}

static void build_regs_read_write_counts(MCInst *MI, m680x_info *info,
           e_access_mode access_mode)
{
  cs_m680x *m680x = &info->m680x;
  int i;

  if (MI->flat_insn->detail == NULL || (!m680x->op_count))
    return;

  for (i = 0; i < m680x->op_count; ++i) {
    e_access access = get_access(i, access_mode);
    update_am_reg_list(MI, info, &m680x->operands[i], access);
  }
}

static void add_operators_access(MCInst *MI, m680x_info *info,
         e_access_mode access_mode)
{
  cs_m680x *m680x = &info->m680x;
  int offset = 0;
  int i;

  if (MI->flat_insn->detail == NULL || (!m680x->op_count) ||
      (access_mode == uuuu))
    return;

  for (i = 0; i < m680x->op_count; ++i) {
    e_access access;

    // Ugly fix: MULD has a register operand, an immediate operand
    // AND an implicitly changed register W
    if (info->insn == M680X_INS_MULD && (i == 1))
      offset = 1;

    access = get_access(i + offset, access_mode);
    m680x->operands[i].access = access;
  }
}

typedef struct insn_to_changed_regs {
  m680x_insn insn;
  e_access_mode access_mode;
  m680x_reg regs[10];
} insn_to_changed_regs;

static void set_changed_regs_read_write_counts(MCInst *MI, m680x_info *info)
{
  //TABLE
#define EOL M680X_REG_INVALID
  static const insn_to_changed_regs changed_regs[] = {
    { M680X_INS_BSR, mmmm, { M680X_REG_S, EOL } },
    { M680X_INS_CALL, mmmm, { M680X_REG_S, EOL } },
    {
      M680X_INS_CWAI,
      mrrr,
      { M680X_REG_S, M680X_REG_PC, M680X_REG_U, M680X_REG_Y,
        M680X_REG_X, M680X_REG_DP, M680X_REG_D, M680X_REG_CC,
        EOL },
    },
    { M680X_INS_DAA, mrrr, { M680X_REG_A, EOL } },
    { M680X_INS_DIV,
      mmrr,
      { M680X_REG_A, M680X_REG_H, M680X_REG_X, EOL } },
    { M680X_INS_EDIV,
      mmrr,
      { M680X_REG_D, M680X_REG_Y, M680X_REG_X, EOL } },
    { M680X_INS_EDIVS,
      mmrr,
      { M680X_REG_D, M680X_REG_Y, M680X_REG_X, EOL } },
    { M680X_INS_EMACS, mrrr, { M680X_REG_X, M680X_REG_Y, EOL } },
    { M680X_INS_EMAXM, rrrr, { M680X_REG_D, EOL } },
    { M680X_INS_EMINM, rrrr, { M680X_REG_D, EOL } },
    { M680X_INS_EMUL, mmrr, { M680X_REG_D, M680X_REG_Y, EOL } },
    { M680X_INS_EMULS, mmrr, { M680X_REG_D, M680X_REG_Y, EOL } },
    { M680X_INS_ETBL, wmmm, { M680X_REG_A, M680X_REG_B, EOL } },
    { M680X_INS_FDIV, mmmm, { M680X_REG_D, M680X_REG_X, EOL } },
    { M680X_INS_IDIV, mmmm, { M680X_REG_D, M680X_REG_X, EOL } },
    { M680X_INS_IDIVS, mmmm, { M680X_REG_D, M680X_REG_X, EOL } },
    { M680X_INS_JSR, mmmm, { M680X_REG_S, EOL } },
    { M680X_INS_LBSR, mmmm, { M680X_REG_S, EOL } },
    { M680X_INS_MAXM, rrrr, { M680X_REG_A, EOL } },
    { M680X_INS_MINM, rrrr, { M680X_REG_A, EOL } },
    { M680X_INS_MEM,
      mmrr,
      { M680X_REG_X, M680X_REG_Y, M680X_REG_A, EOL } },
    { M680X_INS_MUL, mmmm, { M680X_REG_A, M680X_REG_B, EOL } },
    { M680X_INS_MULD, mwrr, { M680X_REG_D, M680X_REG_W, EOL } },
    { M680X_INS_PSHA, rmmm, { M680X_REG_A, M680X_REG_S, EOL } },
    { M680X_INS_PSHB, rmmm, { M680X_REG_B, M680X_REG_S, EOL } },
    { M680X_INS_PSHC, rmmm, { M680X_REG_CC, M680X_REG_S, EOL } },
    { M680X_INS_PSHD, rmmm, { M680X_REG_D, M680X_REG_S, EOL } },
    { M680X_INS_PSHH, rmmm, { M680X_REG_H, M680X_REG_S, EOL } },
    { M680X_INS_PSHX, rmmm, { M680X_REG_X, M680X_REG_S, EOL } },
    { M680X_INS_PSHY, rmmm, { M680X_REG_Y, M680X_REG_S, EOL } },
    { M680X_INS_PULA, wmmm, { M680X_REG_A, M680X_REG_S, EOL } },
    { M680X_INS_PULB, wmmm, { M680X_REG_B, M680X_REG_S, EOL } },
    { M680X_INS_PULC, wmmm, { M680X_REG_CC, M680X_REG_S, EOL } },
    { M680X_INS_PULD, wmmm, { M680X_REG_D, M680X_REG_S, EOL } },
    { M680X_INS_PULH, wmmm, { M680X_REG_H, M680X_REG_S, EOL } },
    { M680X_INS_PULX, wmmm, { M680X_REG_X, M680X_REG_S, EOL } },
    { M680X_INS_PULY, wmmm, { M680X_REG_Y, M680X_REG_S, EOL } },
    { M680X_INS_REV,
      mmrr,
      { M680X_REG_A, M680X_REG_X, M680X_REG_Y, EOL } },
    { M680X_INS_REVW,
      mmmm,
      { M680X_REG_A, M680X_REG_X, M680X_REG_Y, EOL } },
    { M680X_INS_RTC, mwww, { M680X_REG_S, M680X_REG_PC, EOL } },
    {
      M680X_INS_RTI,
      mwww,
      { M680X_REG_S, M680X_REG_CC, M680X_REG_B, M680X_REG_A,
        M680X_REG_DP, M680X_REG_X, M680X_REG_Y, M680X_REG_U,
        M680X_REG_PC, EOL },
    },
    { M680X_INS_RTS, mwww, { M680X_REG_S, M680X_REG_PC, EOL } },
    { M680X_INS_SEX, wrrr, { M680X_REG_A, M680X_REG_B, EOL } },
    { M680X_INS_SEXW, rwww, { M680X_REG_W, M680X_REG_D, EOL } },
    { M680X_INS_SWI,
      mmrr,
      { M680X_REG_S, M680X_REG_PC, M680X_REG_U, M680X_REG_Y,
        M680X_REG_X, M680X_REG_DP, M680X_REG_A, M680X_REG_B,
        M680X_REG_CC, EOL } },
    {
      M680X_INS_SWI2,
      mmrr,
      { M680X_REG_S, M680X_REG_PC, M680X_REG_U, M680X_REG_Y,
        M680X_REG_X, M680X_REG_DP, M680X_REG_A, M680X_REG_B,
        M680X_REG_CC, EOL },
    },
    {
      M680X_INS_SWI3,
      mmrr,
      { M680X_REG_S, M680X_REG_PC, M680X_REG_U, M680X_REG_Y,
        M680X_REG_X, M680X_REG_DP, M680X_REG_A, M680X_REG_B,
        M680X_REG_CC, EOL },
    },
    { M680X_INS_TBL, wrrr, { M680X_REG_A, M680X_REG_B, EOL } },
    { M680X_INS_WAI,
      mrrr,
      { M680X_REG_S, M680X_REG_PC, M680X_REG_X, M680X_REG_A,
        M680X_REG_B, M680X_REG_CC, EOL } },
    { M680X_INS_WAV,
      rmmm,
      { M680X_REG_A, M680X_REG_B, M680X_REG_X, M680X_REG_Y, EOL } },
    { M680X_INS_WAVR,
      rmmm,
      { M680X_REG_A, M680X_REG_B, M680X_REG_X, M680X_REG_Y, EOL } },
  };

  int i, j;

  if (MI->flat_insn->detail == NULL)
    return;

  for (i = 0; i < ARR_SIZE(changed_regs); ++i) {
    if (info->insn == changed_regs[i].insn) {
      e_access_mode access_mode = changed_regs[i].access_mode;

      for (j = 0; changed_regs[i].regs[j] != EOL; ++j) {
        e_access access;

        m680x_reg reg = changed_regs[i].regs[j];

        if (!info->cpu->reg_byte_size[reg]) {
          if (info->insn != M680X_INS_MUL)
            continue;

          // Hack for M68HC05: MUL uses reg. A,X
          reg = M680X_REG_X;
        }

        access = get_access(j, access_mode);
        add_reg_to_rw_list(MI, reg, access);
      }
    }
  }

#undef EOL
}

typedef struct insn_desc {
  uint32_t opcode;
  m680x_insn insn;
  insn_hdlr_id hid[2];
  uint16_t insn_size;
} insn_desc;

// If successful return the additional byte size needed for M6809
// indexed addressing mode (including the indexed addressing post_byte).
// On error return -1.
static int get_indexed09_post_byte_size(const m680x_info *info,
          uint16_t address)
{
  uint8_t ir = 0;
  uint8_t post_byte;

  // Read the indexed addressing post byte.
  if (!read_byte(info, &post_byte, address))
    return -1;

  // Depending on the indexed addressing mode more bytes have to be read.
  switch (post_byte & 0x9F) {
  case 0x87:
  case 0x8A:
  case 0x8E:
  case 0x8F:
  case 0x90:
  case 0x92:
  case 0x97:
  case 0x9A:
  case 0x9E:
    return -1; // illegal indexed post bytes

  case 0x88: // n8,R
  case 0x8C: // n8,PCR
  case 0x98: // [n8,R]
  case 0x9C: // [n8,PCR]
    if (!read_byte(info, &ir, address + 1))
      return -1;
    return 2;

  case 0x89: // n16,R
  case 0x8D: // n16,PCR
  case 0x99: // [n16,R]
  case 0x9D: // [n16,PCR]
    if (!read_byte(info, &ir, address + 2))
      return -1;
    return 3;

  case 0x9F: // [n]
    if ((post_byte & 0x60) != 0 ||
        !read_byte(info, &ir, address + 2))
      return -1;
    return 3;
  }

  // Any other indexed post byte is valid and
  // no additional bytes have to be read.
  return 1;
}

// If successful return the additional byte size needed for CPU12
// indexed addressing mode (including the indexed addressing post_byte).
// On error return -1.
static int get_indexed12_post_byte_size(const m680x_info *info,
          uint16_t address, bool is_subset)
{
  uint8_t ir;
  uint8_t post_byte;

  // Read the indexed addressing post byte.
  if (!read_byte(info, &post_byte, address))
    return -1;

  // Depending on the indexed addressing mode more bytes have to be read.
  if (!(post_byte & 0x20)) // n5,R
    return 1;

  switch (post_byte & 0xe7) {
  case 0xe0:
  case 0xe1: // n9,R
    if (is_subset)
      return -1;

    if (!read_byte(info, &ir, address))
      return -1;
    return 2;

  case 0xe2: // n16,R
  case 0xe3: // [n16,R]
    if (is_subset)
      return -1;

    if (!read_byte(info, &ir, address + 1))
      return -1;
    return 3;

  case 0xe4: // A,R
  case 0xe5: // B,R
  case 0xe6: // D,R
  case 0xe7: // [D,R]
  default: // n,-r n,+r n,r- n,r+
    break;
  }

  return 1;
}

// Check for M6809/HD6309 TFR/EXG instruction for valid register
static bool is_tfr09_reg_valid(const m680x_info *info, uint8_t reg_nibble)
{
  if (info->cpu->tfr_reg_valid != NULL)
    return info->cpu->tfr_reg_valid[reg_nibble];

  return true; // e.g. for the M6309 all registers are valid
}

// Check for CPU12 TFR/EXG instruction for valid register
static bool is_exg_tfr12_post_byte_valid(const m680x_info *info,
           uint8_t post_byte)
{
  return !(post_byte & 0x08);
}

static bool is_tfm_reg_valid(const m680x_info *info, uint8_t reg_nibble)
{
  // HD6809 TFM instruction: Only register X,Y,U,S,D is allowed
  return reg_nibble <= 4;
}

// If successful return the additional byte size needed for CPU12
// loop instructions DBEQ/DBNE/IBEQ/IBNE/TBEQ/TBNE (including the post byte).
// On error return -1.
static int get_loop_post_byte_size(const m680x_info *info, uint16_t address)
{
  uint8_t post_byte;
  uint8_t rr;

  if (!read_byte(info, &post_byte, address))
    return -1;

  // According to documentation bit 3 is don't care and not checked here.
  if ((post_byte >= 0xc0) || ((post_byte & 0x07) == 2) ||
      ((post_byte & 0x07) == 3))
    return -1;

  if (!read_byte(info, &rr, address + 1))
    return -1;

  return 2;
}

// If successful return the additional byte size needed for HD6309
// bit move instructions BAND/BEOR/BIAND/BIEOR/BIOR/BOR/LDBT/STBT
// (including the post byte).
// On error return -1.
static int get_bitmv_post_byte_size(const m680x_info *info, uint16_t address)
{
  uint8_t post_byte;
  uint8_t rr;

  if (!read_byte(info, &post_byte, address))
    return -1;

  if ((post_byte & 0xc0) == 0xc0)
    return -1; // Invalid register specified
  else {
    if (!read_byte(info, &rr, address + 1))
      return -1;
  }

  return 2;
}

static bool is_sufficient_code_size(const m680x_info *info, uint16_t address,
            insn_desc *insn_description)
{
  int i;
  bool retval = true;
  uint16_t size = 0;
  int sz;

  for (i = 0; i < 2; i++) {
    uint8_t ir = 0;
    bool is_subset = false;

    switch (insn_description->hid[i]) {
    case imm32_hid:
      if ((retval = read_byte(info, &ir, address + size + 3)))
        size += 4;
      break;

    case ext_hid:
    case imm16_hid:
    case rel16_hid:
    case imm8rel_hid:
    case opidxdr_hid:
    case idxX16_hid:
    case idxS16_hid:
    case dirdir_hid:
    case immdir_hid:
      if ((retval = read_byte(info, &ir, address + size + 1)))
        size += 2;
      break;

    case rel8_hid:
    case dir_hid:
    case rbits_hid:
    case imm8_hid:
    case idxX_hid:
    case idxXp_hid:
    case idxY_hid:
    case idxS_hid:
    case index_hid:
      if ((retval = read_byte(info, &ir, address + size)))
        size++;
      break;

    case illgl_hid:
    case inh_hid:
    case idxX0_hid:
    case idxX0p_hid:
    case opidx_hid:
    case srt_hid:
    case tny_hid:
      retval = true;
      break;

    case idx09_hid:
      sz = get_indexed09_post_byte_size(info, address + size);
      if (sz >= 0)
        size += sz;
      else
        retval = false;
      break;

    case idx12s_hid:
      is_subset = true;

      // intentionally fall through

    case idx12_hid:
      sz = get_indexed12_post_byte_size(info, address + size,
                is_subset);
      if (sz >= 0)
        size += sz;
      else
        retval = false;
      break;

    case exti12x_hid:
    case imm16i12x_hid:
      sz = get_indexed12_post_byte_size(info, address + size,
                false);
      if (sz >= 0) {
        size += sz;
        if ((retval = read_byte(info, &ir,
              address + size + 1)))
          size += 2;
      } else
        retval = false;
      break;

    case imm8i12x_hid:
      sz = get_indexed12_post_byte_size(info, address + size,
                false);
      if (sz >= 0) {
        size += sz;
        if ((retval = read_byte(info, &ir,
              address + size)))
          size++;
      } else
        retval = false;
      break;

    case tfm_hid:
      if ((retval = read_byte(info, &ir, address + size))) {
        size++;
        retval = is_tfm_reg_valid(info,
                (ir >> 4) & 0x0F) &&
           is_tfm_reg_valid(info, ir & 0x0F);
      }
      break;

    case rr09_hid:
      if ((retval = read_byte(info, &ir, address + size))) {
        size++;
        retval = is_tfr09_reg_valid(info,
                  (ir >> 4) & 0x0F) &&
           is_tfr09_reg_valid(info, ir & 0x0F);
      }
      break;

    case rr12_hid:
      if ((retval = read_byte(info, &ir, address + size))) {
        size++;
        retval = is_exg_tfr12_post_byte_valid(info, ir);
      }
      break;

    case bitmv_hid:
      sz = get_bitmv_post_byte_size(info, address + size);
      if (sz >= 0)
        size += sz;
      else
        retval = false;
      break;

    case loop_hid:
      sz = get_loop_post_byte_size(info, address + size);
      if (sz >= 0)
        size += sz;
      else
        retval = false;
      break;

    default:
      CS_ASSERT(0 && "Unexpected instruction handler id");
      retval = false;
      break;
    }

    if (!retval)
      return false;
  }

  insn_description->insn_size += size;

  return retval;
}

// Check for a valid M680X instruction AND for enough bytes in the code buffer
// Return an instruction description in insn_desc.
static bool decode_insn(const m680x_info *info, uint16_t address,
      insn_desc *insn_description)
{
  const inst_pageX *inst_table = NULL;
  const cpu_tables *cpu = info->cpu;
  size_t table_size = 0;
  uint16_t base_address = address;
  uint8_t ir; // instruction register
  int i;
  int index;

  if (!read_byte(info, &ir, address++))
    return false;

  insn_description->insn = M680X_INS_ILLGL;
  insn_description->opcode = ir;

  // Check if a page prefix byte is present
  for (i = 0; i < ARR_SIZE(cpu->pageX_table_size); ++i) {
    if (cpu->pageX_table_size[i] == 0 ||
        (cpu->inst_pageX_table[i] == NULL))
      break;

    if ((cpu->pageX_prefix[i] == ir)) {
      // Get pageX instruction and handler id.
      // Abort for illegal instr.
      inst_table = cpu->inst_pageX_table[i];
      table_size = cpu->pageX_table_size[i];

      if (!read_byte(info, &ir, address++))
        return false;

      insn_description->opcode =
        (insn_description->opcode << 8) | ir;

      if ((index = binary_search(inst_table, table_size,
               ir)) < 0)
        return false;

      insn_description->hid[0] =
        inst_table[index].handler_id1;
      insn_description->hid[1] =
        inst_table[index].handler_id2;
      insn_description->insn = inst_table[index].insn;
      break;
    }
  }

  if (insn_description->insn == M680X_INS_ILLGL) {
    // Get page1 insn description
    insn_description->insn = cpu->inst_page1_table[ir].insn;
    insn_description->hid[0] =
      cpu->inst_page1_table[ir].handler_id1;
    insn_description->hid[1] =
      cpu->inst_page1_table[ir].handler_id2;
  }

  if (insn_description->insn == M680X_INS_ILLGL) {
    // Check if opcode byte is present in an overlay table
    for (i = 0; i < ARR_SIZE(cpu->overlay_table_size); ++i) {
      if (cpu->overlay_table_size[i] == 0 ||
          (cpu->inst_overlay_table[i] == NULL))
        break;

      inst_table = cpu->inst_overlay_table[i];
      table_size = cpu->overlay_table_size[i];

      if ((index = binary_search(inst_table, table_size,
               ir)) >= 0) {
        insn_description->hid[0] =
          inst_table[index].handler_id1;
        insn_description->hid[1] =
          inst_table[index].handler_id2;
        insn_description->insn = inst_table[index].insn;
        break;
      }
    }
  }

  insn_description->insn_size = address - base_address;

  return (insn_description->insn != M680X_INS_ILLGL) &&
         (insn_description->insn != M680X_INS_INVLD) &&
         is_sufficient_code_size(info, address, insn_description);
}

static void illegal_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  cs_m680x_op *op0 = &info->m680x.operands[info->m680x.op_count++];
  uint8_t temp8 = 0;

  info->insn = M680X_INS_ILLGL;
  read_byte(info, &temp8, (*address)++);
  op0->imm = (int32_t)temp8 & 0xff;
  op0->type = M680X_OP_IMMEDIATE;
  op0->size = 1;
}

static void inherent_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  // There is nothing to do here :-)
}

static void add_reg_operand(m680x_info *info, m680x_reg reg)
{
  cs_m680x *m680x = &info->m680x;
  cs_m680x_op *op = &m680x->operands[m680x->op_count++];

  op->type = M680X_OP_REGISTER;
  op->reg = reg;
  op->size = info->cpu->reg_byte_size[reg];
}

static void set_operand_size(m680x_info *info, cs_m680x_op *op,
           uint8_t default_size)
{
  cs_m680x *m680x = &info->m680x;

  if (info->insn == M680X_INS_JMP || info->insn == M680X_INS_JSR)
    op->size = 0;
  else if (info->insn == M680X_INS_DIVD ||
     ((info->insn == M680X_INS_AIS ||
       info->insn == M680X_INS_AIX) &&
      op->type != M680X_OP_REGISTER))
    op->size = 1;
  else if (info->insn == M680X_INS_DIVQ || info->insn == M680X_INS_MOVW)
    op->size = 2;
  else if (info->insn == M680X_INS_EMACS)
    op->size = 4;
  else if ((m680x->op_count > 0) &&
     (m680x->operands[0].type == M680X_OP_REGISTER))
    op->size = m680x->operands[0].size;
  else
    op->size = default_size;
}

static const m680x_reg reg_s_reg_ids[] = {
  M680X_REG_CC, M680X_REG_A, M680X_REG_B, M680X_REG_DP,
  M680X_REG_X,  M680X_REG_Y, M680X_REG_U, M680X_REG_PC,
};

static const m680x_reg reg_u_reg_ids[] = {
  M680X_REG_CC, M680X_REG_A, M680X_REG_B, M680X_REG_DP,
  M680X_REG_X,  M680X_REG_Y, M680X_REG_S, M680X_REG_PC,
};

static void reg_bits_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  cs_m680x_op *op0 = &info->m680x.operands[0];
  uint8_t reg_bits = 0;
  uint16_t bit_index;
  const m680x_reg *reg_to_reg_ids = NULL;

  read_byte(info, &reg_bits, (*address)++);

  switch (op0->reg) {
  case M680X_REG_U:
    reg_to_reg_ids = &reg_u_reg_ids[0];
    break;

  case M680X_REG_S:
    reg_to_reg_ids = &reg_s_reg_ids[0];
    break;

  default:
    CS_ASSERT(0 && "Unexpected operand0 register");
    break;
  }

  if ((info->insn == M680X_INS_PULU || (info->insn == M680X_INS_PULS)) &&
      ((reg_bits & 0x80) != 0))
    // PULS xxx,PC or PULU xxx,PC which is like return from
    // subroutine (RTS)
    add_insn_group(MI->flat_insn->detail, M680X_GRP_RET);

  for (bit_index = 0; bit_index < 8; ++bit_index) {
    if (reg_bits & (1 << bit_index) && reg_to_reg_ids)
      add_reg_operand(info, reg_to_reg_ids[bit_index]);
  }
}

static const m680x_reg g_tfr_exg_reg_ids[] = {
  /* 16-bit registers */
  M680X_REG_D,
  M680X_REG_X,
  M680X_REG_Y,
  M680X_REG_U,
  M680X_REG_S,
  M680X_REG_PC,
  M680X_REG_W,
  M680X_REG_V,
  /* 8-bit registers */
  M680X_REG_A,
  M680X_REG_B,
  M680X_REG_CC,
  M680X_REG_DP,
  M680X_REG_0,
  M680X_REG_0,
  M680X_REG_E,
  M680X_REG_F,
};

static void reg_reg09_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  uint8_t regs = 0;

  read_byte(info, &regs, (*address)++);

  add_reg_operand(info, g_tfr_exg_reg_ids[regs >> 4]);
  add_reg_operand(info, g_tfr_exg_reg_ids[regs & 0x0f]);

  if ((regs & 0x0f) == 0x05) {
    // EXG xxx,PC or TFR xxx,PC which is like a JMP
    add_insn_group(MI->flat_insn->detail, M680X_GRP_JUMP);
  }
}

static void reg_reg12_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  static const m680x_reg g_tfr_exg12_reg0_ids[] = {
    M680X_REG_A, M680X_REG_B, M680X_REG_CC, M680X_REG_TMP3,
    M680X_REG_D, M680X_REG_X, M680X_REG_Y,  M680X_REG_S,
  };
  static const m680x_reg g_tfr_exg12_reg1_ids[] = {
    M680X_REG_A, M680X_REG_B, M680X_REG_CC, M680X_REG_TMP2,
    M680X_REG_D, M680X_REG_X, M680X_REG_Y,  M680X_REG_S,
  };
  uint8_t regs = 0;

  read_byte(info, &regs, (*address)++);

  // The opcode of this instruction depends on
  // the msb of its post byte.
  if (regs & 0x80)
    info->insn = M680X_INS_EXG;
  else
    info->insn = M680X_INS_TFR;

  add_reg_operand(info, g_tfr_exg12_reg0_ids[(regs >> 4) & 0x07]);
  add_reg_operand(info, g_tfr_exg12_reg1_ids[regs & 0x07]);
}

static void add_rel_operand(m680x_info *info, int16_t offset, uint16_t address)
{
  cs_m680x *m680x = &info->m680x;
  cs_m680x_op *op = &m680x->operands[m680x->op_count++];

  op->type = M680X_OP_RELATIVE;
  op->size = 0;
  op->rel.offset = offset;
  op->rel.address = address;
}

static void relative8_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  int16_t offset = 0;

  read_byte_sign_extended(info, &offset, (*address)++);
  add_rel_operand(info, offset, *address + offset);
  add_insn_group(MI->flat_insn->detail, M680X_GRP_BRAREL);

  if ((info->insn != M680X_INS_BRA) && (info->insn != M680X_INS_BSR) &&
      (info->insn != M680X_INS_BRN))
    add_reg_to_rw_list(MI, M680X_REG_CC, READ);
}

static void relative16_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  uint16_t offset = 0;

  read_word(info, &offset, *address);
  *address += 2;
  add_rel_operand(info, (int16_t)offset, *address + offset);
  add_insn_group(MI->flat_insn->detail, M680X_GRP_BRAREL);

  if ((info->insn != M680X_INS_LBRA) && (info->insn != M680X_INS_LBSR) &&
      (info->insn != M680X_INS_LBRN))
    add_reg_to_rw_list(MI, M680X_REG_CC, READ);
}

static const m680x_reg g_rr5_to_reg_ids[] = {
  M680X_REG_X,
  M680X_REG_Y,
  M680X_REG_U,
  M680X_REG_S,
};

static void add_indexed_operand(m680x_info *info, m680x_reg base_reg,
        bool post_inc_dec, uint8_t inc_dec,
        uint8_t offset_bits, uint16_t offset,
        bool no_comma)
{
  cs_m680x *m680x = &info->m680x;
  cs_m680x_op *op = &m680x->operands[m680x->op_count++];

  op->type = M680X_OP_INDEXED;
  set_operand_size(info, op, 1);
  op->idx.base_reg = base_reg;
  op->idx.offset_reg = M680X_REG_INVALID;
  op->idx.inc_dec = inc_dec;

  if (inc_dec && post_inc_dec)
    op->idx.flags |= M680X_IDX_POST_INC_DEC;

  if (offset_bits != M680X_OFFSET_NONE) {
    op->idx.offset = offset;
    op->idx.offset_addr = 0;
  }

  op->idx.offset_bits = offset_bits;
  op->idx.flags |= (no_comma ? M680X_IDX_NO_COMMA : 0);
}

// M6800/1/2/3 indexed mode handler
static void indexedX_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  uint8_t offset = 0;

  read_byte(info, &offset, (*address)++);

  add_indexed_operand(info, M680X_REG_X, false, 0, M680X_OFFSET_BITS_8,
          (uint16_t)offset, false);
}

static void indexedY_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  uint8_t offset = 0;

  read_byte(info, &offset, (*address)++);

  add_indexed_operand(info, M680X_REG_Y, false, 0, M680X_OFFSET_BITS_8,
          (uint16_t)offset, false);
}

// M6809/M6309 indexed mode handler
static void indexed09_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  cs_m680x *m680x = &info->m680x;
  cs_m680x_op *op = &m680x->operands[m680x->op_count++];
  uint8_t post_byte = 0;
  uint16_t offset = 0;
  int16_t soffset = 0;

  read_byte(info, &post_byte, (*address)++);

  op->type = M680X_OP_INDEXED;
  set_operand_size(info, op, 1);
  op->idx.base_reg = g_rr5_to_reg_ids[(post_byte >> 5) & 0x03];
  op->idx.offset_reg = M680X_REG_INVALID;

  if (!(post_byte & 0x80)) {
    // n5,R
    if ((post_byte & 0x10) == 0x10)
      op->idx.offset = post_byte | 0xfff0;
    else
      op->idx.offset = post_byte & 0x0f;

    op->idx.offset_addr = op->idx.offset + *address;
    op->idx.offset_bits = M680X_OFFSET_BITS_5;
  } else {
    if ((post_byte & 0x10) == 0x10)
      op->idx.flags |= M680X_IDX_INDIRECT;

    // indexed addressing
    switch (post_byte & 0x1f) {
    case 0x00: // ,R+
      op->idx.inc_dec = 1;
      op->idx.flags |= M680X_IDX_POST_INC_DEC;
      break;

    case 0x11: // [,R++]
    case 0x01: // ,R++
      op->idx.inc_dec = 2;
      op->idx.flags |= M680X_IDX_POST_INC_DEC;
      break;

    case 0x02: // ,-R
      op->idx.inc_dec = -1;
      break;

    case 0x13: // [,--R]
    case 0x03: // ,--R
      op->idx.inc_dec = -2;
      break;

    case 0x14: // [,R]
    case 0x04: // ,R
      break;

    case 0x15: // [B,R]
    case 0x05: // B,R
      op->idx.offset_reg = M680X_REG_B;
      break;

    case 0x16: // [A,R]
    case 0x06: // A,R
      op->idx.offset_reg = M680X_REG_A;
      break;

    case 0x1c: // [n8,PCR]
    case 0x0c: // n8,PCR
      op->idx.base_reg = M680X_REG_PC;
      read_byte_sign_extended(info, &soffset, (*address)++);
      op->idx.offset_addr = offset + *address;
      op->idx.offset = soffset;
      op->idx.offset_bits = M680X_OFFSET_BITS_8;
      break;

    case 0x18: // [n8,R]
    case 0x08: // n8,R
      read_byte_sign_extended(info, &soffset, (*address)++);
      op->idx.offset = soffset;
      op->idx.offset_bits = M680X_OFFSET_BITS_8;
      break;

    case 0x1d: // [n16,PCR]
    case 0x0d: // n16,PCR
      op->idx.base_reg = M680X_REG_PC;
      read_word(info, &offset, *address);
      *address += 2;
      op->idx.offset_addr = offset + *address;
      op->idx.offset = (int16_t)offset;
      op->idx.offset_bits = M680X_OFFSET_BITS_16;
      break;

    case 0x19: // [n16,R]
    case 0x09: // n16,R
      read_word(info, &offset, *address);
      *address += 2;
      op->idx.offset = (int16_t)offset;
      op->idx.offset_bits = M680X_OFFSET_BITS_16;
      break;

    case 0x1b: // [D,R]
    case 0x0b: // D,R
      op->idx.offset_reg = M680X_REG_D;
      break;

    case 0x1f: // [n16]
      op->type = M680X_OP_EXTENDED;
      op->ext.indirect = true;
      read_word(info, &op->ext.address, *address);
      *address += 2;
      break;

    default:
      op->idx.base_reg = M680X_REG_INVALID;
      break;
    }
  }

  if (((info->insn == M680X_INS_LEAU) || (info->insn == M680X_INS_LEAS) ||
       (info->insn == M680X_INS_LEAX) ||
       (info->insn == M680X_INS_LEAY)) &&
      (m680x->operands[0].reg == M680X_REG_X ||
       (m680x->operands[0].reg == M680X_REG_Y)))
    // Only LEAX and LEAY modify CC register
    add_reg_to_rw_list(MI, M680X_REG_CC, MODIFY);
}

static const m680x_reg g_idx12_to_reg_ids[4] = {
  M680X_REG_X,
  M680X_REG_Y,
  M680X_REG_S,
  M680X_REG_PC,
};

static const m680x_reg g_or12_to_reg_ids[3] = { M680X_REG_A, M680X_REG_B,
            M680X_REG_D };

// CPU12 indexed mode handler
static void indexed12_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  cs_m680x *m680x = &info->m680x;
  cs_m680x_op *op = &m680x->operands[m680x->op_count++];
  uint8_t post_byte = 0;
  uint8_t offset8 = 0;

  read_byte(info, &post_byte, (*address)++);

  op->type = M680X_OP_INDEXED;
  set_operand_size(info, op, 1);
  op->idx.offset_reg = M680X_REG_INVALID;

  if (!(post_byte & 0x20)) {
    // n5,R      n5 is a 5-bit signed offset
    op->idx.base_reg = g_idx12_to_reg_ids[(post_byte >> 6) & 0x03];

    if ((post_byte & 0x10) == 0x10)
      op->idx.offset = post_byte | 0xfff0;
    else
      op->idx.offset = post_byte & 0x0f;

    op->idx.offset_addr = op->idx.offset + *address;
    op->idx.offset_bits = M680X_OFFSET_BITS_5;
  } else {
    if ((post_byte & 0xe0) == 0xe0)
      op->idx.base_reg =
        g_idx12_to_reg_ids[(post_byte >> 3) & 0x03];

    switch (post_byte & 0xe7) {
    case 0xe0:
    case 0xe1: // n9,R
      read_byte(info, &offset8, (*address)++);
      op->idx.offset = offset8;

      if (post_byte & 0x01) // sign extension
        op->idx.offset |= 0xff00;

      op->idx.offset_bits = M680X_OFFSET_BITS_9;

      if (op->idx.base_reg == M680X_REG_PC)
        op->idx.offset_addr = op->idx.offset + *address;

      break;

    case 0xe3: // [n16,R]
      op->idx.flags |= M680X_IDX_INDIRECT;

    // intentionally fall through
    case 0xe2: // n16,R
      read_word(info, (uint16_t *)&op->idx.offset, *address);
      (*address) += 2;
      op->idx.offset_bits = M680X_OFFSET_BITS_16;

      if (op->idx.base_reg == M680X_REG_PC)
        op->idx.offset_addr = op->idx.offset + *address;

      break;

    case 0xe4: // A,R
    case 0xe5: // B,R
    case 0xe6: // D,R
      op->idx.offset_reg =
        g_or12_to_reg_ids[post_byte & 0x03];
      break;

    case 0xe7: // [D,R]
      op->idx.offset_reg = M680X_REG_D;
      op->idx.flags |= M680X_IDX_INDIRECT;
      break;

    default: // n,-r n,+r n,r- n,r+
      // PC is not allowed in this mode
      op->idx.base_reg =
        g_idx12_to_reg_ids[(post_byte >> 6) & 0x03];
      op->idx.inc_dec = post_byte & 0x0f;

      if (op->idx.inc_dec & 0x08) // evtl. sign extend value
        op->idx.inc_dec |= 0xf0;

      if (op->idx.inc_dec >= 0)
        op->idx.inc_dec++;

      if (post_byte & 0x10)
        op->idx.flags |= M680X_IDX_POST_INC_DEC;

      break;
    }
  }
}

static void index_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  cs_m680x *m680x = &info->m680x;
  cs_m680x_op *op = &m680x->operands[m680x->op_count++];

  op->type = M680X_OP_CONSTANT;
  read_byte(info, &op->const_val, (*address)++);
};

static void direct_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  cs_m680x *m680x = &info->m680x;
  cs_m680x_op *op = &m680x->operands[m680x->op_count++];

  op->type = M680X_OP_DIRECT;
  set_operand_size(info, op, 1);
  read_byte(info, &op->direct_addr, (*address)++);
};

static void extended_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  cs_m680x *m680x = &info->m680x;
  cs_m680x_op *op = &m680x->operands[m680x->op_count++];

  op->type = M680X_OP_EXTENDED;
  set_operand_size(info, op, 1);
  read_word(info, &op->ext.address, *address);
  *address += 2;
}

static void immediate_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  cs_m680x *m680x = &info->m680x;
  cs_m680x_op *op = &m680x->operands[m680x->op_count++];
  uint16_t word = 0;
  int16_t sword = 0;

  op->type = M680X_OP_IMMEDIATE;
  set_operand_size(info, op, 1);

  switch (op->size) {
  case 1:
    read_byte_sign_extended(info, &sword, *address);
    op->imm = sword;
    break;

  case 2:
    read_word(info, &word, *address);
    op->imm = (int16_t)word;
    break;

  case 4:
    read_sdword(info, &op->imm, *address);
    break;

  default:
    op->imm = 0;
    CS_ASSERT(0 && "Unexpected immediate byte size");
  }

  *address += op->size;
}

// handler for bit move instructions, e.g: BAND A,5,1,$40  Used by HD6309
static void bit_move_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  static const m680x_reg m680x_reg[] = {
    M680X_REG_CC,
    M680X_REG_A,
    M680X_REG_B,
    M680X_REG_INVALID,
  };

  uint8_t post_byte = 0;
  cs_m680x *m680x = &info->m680x;
  cs_m680x_op *op;

  read_byte(info, &post_byte, *address);
  (*address)++;

  // operand[0] = register
  add_reg_operand(info, m680x_reg[post_byte >> 6]);

  // operand[1] = bit index in source operand
  op = &m680x->operands[m680x->op_count++];
  op->type = M680X_OP_CONSTANT;
  op->const_val = (post_byte >> 3) & 0x07;

  // operand[2] = bit index in destination operand
  op = &m680x->operands[m680x->op_count++];
  op->type = M680X_OP_CONSTANT;
  op->const_val = post_byte & 0x07;

  direct_hdlr(MI, info, address);
}

// handler for TFM instruction, e.g: TFM X+,Y+  Used by HD6309
static void tfm_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  static const uint8_t inc_dec_r0[] = {
    1,
    -1,
    1,
    0,
  };
  static const uint8_t inc_dec_r1[] = {
    1,
    -1,
    0,
    1,
  };
  uint8_t regs = 0;
  uint8_t index = (MI->Opcode & 0xff) - 0x38;

  read_byte(info, &regs, *address);

  add_indexed_operand(info, g_tfr_exg_reg_ids[regs >> 4], true,
          inc_dec_r0[index], M680X_OFFSET_NONE, 0, true);
  add_indexed_operand(info, g_tfr_exg_reg_ids[regs & 0x0f], true,
          inc_dec_r1[index], M680X_OFFSET_NONE, 0, true);

  add_reg_to_rw_list(MI, M680X_REG_W, READ | WRITE);
}

static void opidx_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  cs_m680x *m680x = &info->m680x;
  cs_m680x_op *op = &m680x->operands[m680x->op_count++];

  // bit index is coded in Opcode
  op->type = M680X_OP_CONSTANT;
  op->const_val = (MI->Opcode & 0x0e) >> 1;
}

// handler for bit test and branch instruction. Used by M6805.
// The bit index is part of the opcode.
// Example: BRSET 3,<$40,LOOP
static void opidx_dir_rel_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  cs_m680x *m680x = &info->m680x;
  cs_m680x_op *op = &m680x->operands[m680x->op_count++];

  // bit index is coded in Opcode
  op->type = M680X_OP_CONSTANT;
  op->const_val = (MI->Opcode & 0x0e) >> 1;
  direct_hdlr(MI, info, address);
  relative8_hdlr(MI, info, address);

  add_reg_to_rw_list(MI, M680X_REG_CC, MODIFY);
}

static void indexedX0_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  add_indexed_operand(info, M680X_REG_X, false, 0, M680X_OFFSET_NONE, 0,
          false);
}

static void indexedX16_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  uint16_t offset = 0;

  read_word(info, &offset, *address);
  *address += 2;
  add_indexed_operand(info, M680X_REG_X, false, 0, M680X_OFFSET_BITS_16,
          offset, false);
}

static void imm_rel_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  immediate_hdlr(MI, info, address);
  relative8_hdlr(MI, info, address);
}

static void indexedS_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  uint8_t offset = 0;

  read_byte(info, &offset, (*address)++);

  add_indexed_operand(info, M680X_REG_S, false, 0, M680X_OFFSET_BITS_8,
          (uint16_t)offset, false);
}

static void indexedS16_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  uint16_t offset = 0;

  read_word(info, &offset, *address);
  *address += 2;

  add_indexed_operand(info, M680X_REG_S, false, 0, M680X_OFFSET_BITS_16,
          offset, false);
}

static void indexedX0p_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  add_indexed_operand(info, M680X_REG_X, true, 1, M680X_OFFSET_NONE, 0,
          true);
}

static void indexedXp_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  uint8_t offset = 0;

  read_byte(info, &offset, (*address)++);

  add_indexed_operand(info, M680X_REG_X, true, 1, M680X_OFFSET_BITS_8,
          (uint16_t)offset, false);
}

static void imm_idx12_x_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  cs_m680x *m680x = &info->m680x;
  cs_m680x_op *op = &m680x->operands[m680x->op_count++];

  indexed12_hdlr(MI, info, address);
  op->type = M680X_OP_IMMEDIATE;

  if (info->insn == M680X_INS_MOVW) {
    uint16_t imm16 = 0;

    read_word(info, &imm16, *address);
    op->imm = (int16_t)imm16;
    op->size = 2;
  } else {
    uint8_t imm8 = 0;

    read_byte(info, &imm8, *address);
    op->imm = (int8_t)imm8;
    op->size = 1;
  }

  set_operand_size(info, op, 1);
}

static void ext_idx12_x_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  cs_m680x *m680x = &info->m680x;
  cs_m680x_op *op0 = &m680x->operands[m680x->op_count++];
  uint16_t imm16 = 0;

  indexed12_hdlr(MI, info, address);
  read_word(info, &imm16, *address);
  op0->type = M680X_OP_EXTENDED;
  op0->ext.address = (int16_t)imm16;
  set_operand_size(info, op0, 1);
}

// handler for CPU12 DBEQ/DNBE/IBEQ/IBNE/TBEQ/TBNE instructions.
// Example: DBNE X,$1000
static void loop_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  static const m680x_reg index_to_reg_id[] = {
    M680X_REG_A, M680X_REG_B, M680X_REG_INVALID, M680X_REG_INVALID,
    M680X_REG_D, M680X_REG_X, M680X_REG_Y,       M680X_REG_S,
  };
  static const m680x_insn index_to_insn_id[] = {
    M680X_INS_DBEQ, M680X_INS_DBNE, M680X_INS_TBEQ,  M680X_INS_TBNE,
    M680X_INS_IBEQ, M680X_INS_IBNE, M680X_INS_ILLGL, M680X_INS_ILLGL
  };
  cs_m680x *m680x = &info->m680x;
  uint8_t post_byte = 0;
  uint8_t rel = 0;
  cs_m680x_op *op;

  read_byte(info, &post_byte, (*address)++);

  info->insn = index_to_insn_id[(post_byte >> 5) & 0x07];

  if (info->insn == M680X_INS_ILLGL) {
    illegal_hdlr(MI, info, address);
  };

  read_byte(info, &rel, (*address)++);

  add_reg_operand(info, index_to_reg_id[post_byte & 0x07]);

  op = &m680x->operands[m680x->op_count++];

  op->type = M680X_OP_RELATIVE;

  op->rel.offset = (post_byte & 0x10) ? (int16_t)(0xff00 | rel) : rel;

  op->rel.address = *address + op->rel.offset;

  add_insn_group(MI->flat_insn->detail, M680X_GRP_BRAREL);
}

// handler for RS08 specific TNY instruction
// The operand address is embedded in the the least 4 significant bits of the opcode
static void tny_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  cs_m680x *m680x = &info->m680x;
  cs_m680x_op *op = &m680x->operands[m680x->op_count++];

  op->type = M680X_OP_DIRECT;
  op->direct_addr = (uint8_t)(MI->Opcode & 0x0F);
  op->size = 1;
}

// handler for RS08 specific SRT instruction
// The operand address is embedded in the the least 5 significant bits of the opcode
static void srt_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  cs_m680x *m680x = &info->m680x;
  cs_m680x_op *op = &m680x->operands[m680x->op_count++];

  op->type = M680X_OP_DIRECT;
  op->direct_addr = (uint8_t)(MI->Opcode & 0x1F);
  op->size = 1;
}

static void dirdir_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  direct_hdlr(MI, info, address);
  direct_hdlr(MI, info, address);
}

static void immdir_hdlr(MCInst *MI, m680x_info *info, uint16_t *address)
{
  immediate_hdlr(MI, info, address);
  direct_hdlr(MI, info, address);
}

static void (*const g_insn_handler[])(MCInst *, m680x_info *, uint16_t *) = {
  illegal_hdlr,   relative8_hdlr,   relative16_hdlr,
  immediate_hdlr, // 8-bit
  immediate_hdlr, // 16-bit
  immediate_hdlr, // 32-bit
  direct_hdlr,    extended_hdlr,    indexedX_hdlr,   indexedY_hdlr,
  indexed09_hdlr,   inherent_hdlr,    reg_reg09_hdlr,  reg_bits_hdlr,
  bit_move_hdlr,    tfm_hdlr,     opidx_hdlr,      opidx_dir_rel_hdlr,
  indexedX0_hdlr,   indexedX16_hdlr,  imm_rel_hdlr,    indexedS_hdlr,
  indexedS16_hdlr,  indexedXp_hdlr,   indexedX0p_hdlr, indexed12_hdlr,
  indexed12_hdlr, // subset of indexed12
  reg_reg12_hdlr,   loop_hdlr,      index_hdlr,      imm_idx12_x_hdlr,
  imm_idx12_x_hdlr, ext_idx12_x_hdlr, srt_hdlr,      tny_hdlr,
  dirdir_hdlr,    immdir_hdlr
}; /* handler function pointers */

/* Disasemble one instruction at address and store in str_buff */
static unsigned int m680x_disassemble(MCInst *MI, m680x_info *info,
              uint16_t address)
{
  cs_m680x *m680x = &info->m680x;
  cs_detail *detail = MI->flat_insn->detail;
  uint16_t base_address = address;
  insn_desc insn_description;
  e_access_mode access_mode;

  if (detail != NULL) {
    memset(detail, 0,
           offsetof(cs_detail, m680x) + sizeof(cs_m680x));
  }

  memset(&insn_description, 0, sizeof(insn_description));
  memset(m680x, 0, sizeof(*m680x));
  info->insn_size = 1;

  if (decode_insn(info, address, &insn_description)) {
    m680x_reg reg;

    if (insn_description.opcode > 0xff)
      address += 2; // 8-bit opcode + page prefix
    else
      address++; // 8-bit opcode only

    info->insn = insn_description.insn;

    MCInst_setOpcode(MI, insn_description.opcode);

    reg = g_insn_props[info->insn].reg0;

    if (reg != M680X_REG_INVALID) {
      if (reg == M680X_REG_HX &&
          (!info->cpu->reg_byte_size[reg]))
        reg = M680X_REG_X;

      add_reg_operand(info, reg);
      // First (or second) operand is a register which is
      // part of the mnemonic
      m680x->flags |= M680X_FIRST_OP_IN_MNEM;
      reg = g_insn_props[info->insn].reg1;

      if (reg != M680X_REG_INVALID) {
        if (reg == M680X_REG_HX &&
            (!info->cpu->reg_byte_size[reg]))
          reg = M680X_REG_X;

        add_reg_operand(info, reg);
        m680x->flags |= M680X_SECOND_OP_IN_MNEM;
      }
    }

    // Call addressing mode specific instruction handler
    (g_insn_handler[insn_description.hid[0]])(MI, info, &address);
    (g_insn_handler[insn_description.hid[1]])(MI, info, &address);

    add_insn_group(detail, g_insn_props[info->insn].group);

    if (g_insn_props[info->insn].cc_modified &&
        (info->cpu->insn_cc_not_modified[0] != info->insn) &&
        (info->cpu->insn_cc_not_modified[1] != info->insn))
      add_reg_to_rw_list(MI, M680X_REG_CC, MODIFY);

    access_mode = g_insn_props[info->insn].access_mode;

    // Fix for M6805 BSET/BCLR. It has a different operand order
    // in comparison to the M6811
    if ((info->cpu->insn_cc_not_modified[0] == info->insn) ||
        (info->cpu->insn_cc_not_modified[1] == info->insn))
      access_mode = rmmm;

    build_regs_read_write_counts(MI, info, access_mode);
    add_operators_access(MI, info, access_mode);

    if (g_insn_props[info->insn].update_reg_access)
      set_changed_regs_read_write_counts(MI, info);

    info->insn_size = (uint8_t)insn_description.insn_size;

    return info->insn_size;
  } else
    MCInst_setOpcode(MI, insn_description.opcode);

  // Illegal instruction
  address = base_address;
  illegal_hdlr(MI, info, &address);
  return 1;
}

// Tables to get the byte size of a register on the CPU
// based on an enum m680x_reg value defined in m680x.h
// Invalid registers return 0.
static const uint8_t g_m6800_reg_byte_size[23] = {
  // A  B  E  F  0  D  W  CC DP MD HX H  X  Y  S  U  V  Q  PC SPC T2 T3
  0, 1, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 2, 0, 2, 0, 0, 0, 2, 0, 0, 0
};

static const uint8_t g_m6805_reg_byte_size[23] = {
  // A  B  E  F  0  D  W  CC DP MD HX H  X  Y  S  U  V  Q  PC SPC T2 T3
  0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 2, 0, 0, 0, 2, 0, 0, 0
};

static const uint8_t g_m6808_reg_byte_size[23] = {
  // A  B  E  F  0  D  W  CC DP MD HX H  X  Y  S  U  V  Q  PC SPC T2 T3
  0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 2, 1, 1, 0, 2, 0, 0, 0, 2, 0, 0, 0
};

static const uint8_t g_m6801_reg_byte_size[23] = {
  // A  B  E  F  0  D  W  CC DP MD HX H  X  Y  S  U  V  Q  PC SPC T2 T3
  0, 1, 1, 0, 0, 0, 2, 0, 1, 0, 0, 0, 0, 2, 0, 2, 0, 0, 0, 2, 0, 0, 0
};

static const uint8_t g_m6811_reg_byte_size[23] = {
  // A  B  E  F  0  D  W  CC DP MD HX H  X  Y  S  U  V  Q  PC SPC T2 T3
  0, 1, 1, 0, 0, 0, 2, 0, 1, 0, 0, 0, 0, 2, 2, 2, 0, 0, 0, 2, 0, 0, 0
};

static const uint8_t g_cpu12_reg_byte_size[23] = {
  // A  B  E  F  0  D  W  CC DP MD HX H  X  Y  S  U  V  Q  PC SPC T2 T3
  0, 1, 1, 0, 0, 0, 2, 0, 1, 0, 0, 0, 0, 2, 2, 2, 0, 0, 0, 2, 0, 2, 2
};

static const uint8_t g_m6809_reg_byte_size[23] = {
  // A  B  E  F  0  D  W  CC DP MD HX H  X  Y  S  U  V  Q  PC SPC T2 T3
  0, 1, 1, 0, 0, 0, 2, 0, 1, 1, 0, 0, 0, 2, 2, 2, 2, 0, 0, 2, 0, 0, 0
};

static const uint8_t g_hd6309_reg_byte_size[23] = {
  // A  B  E  F  0  D  W  CC DP MD HX H  X  Y  S  U  V  Q  PC SPC T2 T3
  0, 1, 1, 1, 1, 1, 2, 2, 1, 1, 1, 0, 0, 2, 2, 2, 2, 2, 4, 2, 0, 0, 0
};

static const uint8_t g_rs08_reg_byte_size[23] = {
  // A  B  E  F  0  D  W  CC DP MD HX H  X  Y  S  U  V  Q  PC SPC T2 T3
  0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 2, 1, 1, 0, 2, 0, 0, 0, 2, 2, 0, 0
};

static const uint8_t g_hcs12x_reg_byte_size[23] = {
  // A  B  E  F  0  D  W  CC DP MD HX H  X  Y  S  U  V  Q  PC SPC T2 T3
  0, 1, 1, 0, 0, 0, 2, 0, 1, 0, 0, 0, 0, 2, 2, 2, 0, 0, 0, 2, 0, 2, 2
};

// Table to check for a valid register nibble on the M6809 CPU
// used for TFR and EXG instruction.
static const bool m6809_tfr_reg_valid[16] = {
  true, true, true, true, true,  true,  false, false,
  true, true, true, true, false, false, false, false,
};

static const cpu_tables g_cpu_tables[] = {
  { // M680X_CPU_TYPE_INVALID
    NULL,
    { NULL, NULL },
    { 0, 0 },
    { 0x00, 0x00, 0x00 },
    { NULL, NULL, NULL },
    { 0, 0, 0 },
    NULL,
    NULL,
    { M680X_INS_INVLD, M680X_INS_INVLD } },
  { // M680X_CPU_TYPE_6301
    &g_m6800_inst_page1_table[0],
    { &g_m6801_inst_overlay_table[0], &g_hd6301_inst_overlay_table[0] },
    { ARR_SIZE(g_m6801_inst_overlay_table),
      ARR_SIZE(g_hd6301_inst_overlay_table) },
    { 0x00, 0x00, 0x00 },
    { NULL, NULL, NULL },
    { 0, 0, 0 },
    &g_m6801_reg_byte_size[0],
    NULL,
    { M680X_INS_INVLD, M680X_INS_INVLD } },
  { // M680X_CPU_TYPE_6309
    &g_m6809_inst_page1_table[0],
    { &g_hd6309_inst_overlay_table[0], NULL },
    { ARR_SIZE(g_hd6309_inst_overlay_table), 0 },
    { 0x10, 0x11, 0x00 },
    { &g_hd6309_inst_page2_table[0], &g_hd6309_inst_page3_table[0],
      NULL },
    { ARR_SIZE(g_hd6309_inst_page2_table),
      ARR_SIZE(g_hd6309_inst_page3_table), 0 },
    &g_hd6309_reg_byte_size[0],
    NULL,
    { M680X_INS_INVLD, M680X_INS_INVLD } },
  { // M680X_CPU_TYPE_6800
    &g_m6800_inst_page1_table[0],
    { NULL, NULL },
    { 0, 0 },
    { 0x00, 0x00, 0x00 },
    { NULL, NULL, NULL },
    { 0, 0, 0 },
    &g_m6800_reg_byte_size[0],
    NULL,
    { M680X_INS_INVLD, M680X_INS_INVLD } },
  { // M680X_CPU_TYPE_6801
    &g_m6800_inst_page1_table[0],
    { &g_m6801_inst_overlay_table[0], NULL },
    { ARR_SIZE(g_m6801_inst_overlay_table), 0 },
    { 0x00, 0x00, 0x00 },
    { NULL, NULL, NULL },
    { 0, 0, 0 },
    &g_m6801_reg_byte_size[0],
    NULL,
    { M680X_INS_INVLD, M680X_INS_INVLD } },
  { // M680X_CPU_TYPE_6805
    &g_m6805_inst_page1_table[0],
    { NULL, NULL },
    { 0, 0 },
    { 0x00, 0x00, 0x00 },
    { NULL, NULL, NULL },
    { 0, 0, 0 },
    &g_m6805_reg_byte_size[0],
    NULL,
    { M680X_INS_BCLR, M680X_INS_BSET } },
  { // M680X_CPU_TYPE_6808
    &g_m6805_inst_page1_table[0],
    { &g_m6808_inst_overlay_table[0], NULL },
    { ARR_SIZE(g_m6808_inst_overlay_table), 0 },
    { 0x9E, 0x00, 0x00 },
    { &g_m6808_inst_page2_table[0], NULL, NULL },
    { ARR_SIZE(g_m6808_inst_page2_table), 0, 0 },
    &g_m6808_reg_byte_size[0],
    NULL,
    { M680X_INS_BCLR, M680X_INS_BSET } },
  { // M680X_CPU_TYPE_6809
    &g_m6809_inst_page1_table[0],
    { NULL, NULL },
    { 0, 0 },
    { 0x10, 0x11, 0x00 },
    { &g_m6809_inst_page2_table[0], &g_m6809_inst_page3_table[0], NULL },
    { ARR_SIZE(g_m6809_inst_page2_table),
      ARR_SIZE(g_m6809_inst_page3_table), 0 },
    &g_m6809_reg_byte_size[0],
    &m6809_tfr_reg_valid[0],
    { M680X_INS_INVLD, M680X_INS_INVLD } },
  { // M680X_CPU_TYPE_6811
    &g_m6800_inst_page1_table[0],
    { &g_m6801_inst_overlay_table[0], &g_m6811_inst_overlay_table[0] },
    { ARR_SIZE(g_m6801_inst_overlay_table),
      ARR_SIZE(g_m6811_inst_overlay_table) },
    { 0x18, 0x1A, 0xCD },
    { &g_m6811_inst_page2_table[0], &g_m6811_inst_page3_table[0],
      &g_m6811_inst_page4_table[0] },
    { ARR_SIZE(g_m6811_inst_page2_table),
      ARR_SIZE(g_m6811_inst_page3_table),
      ARR_SIZE(g_m6811_inst_page4_table) },
    &g_m6811_reg_byte_size[0],
    NULL,
    { M680X_INS_INVLD, M680X_INS_INVLD } },
  { // M680X_CPU_TYPE_CPU12
    &g_cpu12_inst_page1_table[0],
    { NULL, NULL },
    { 0, 0 },
    { 0x18, 0x00, 0x00 },
    { &g_cpu12_inst_page2_table[0], NULL, NULL },
    { ARR_SIZE(g_cpu12_inst_page2_table), 0, 0 },
    &g_cpu12_reg_byte_size[0],
    NULL,
    { M680X_INS_INVLD, M680X_INS_INVLD } },
  { // M680X_CPU_TYPE_HCS08
    &g_m6805_inst_page1_table[0],
    { &g_m6808_inst_overlay_table[0], &g_hcs08_inst_overlay_table[0] },
    { ARR_SIZE(g_m6808_inst_overlay_table),
      ARR_SIZE(g_hcs08_inst_overlay_table) },
    { 0x9E, 0x00, 0x00 },
    { &g_hcs08_inst_page2_table[0], NULL, NULL },
    { ARR_SIZE(g_hcs08_inst_page2_table), 0, 0 },
    &g_m6808_reg_byte_size[0],
    NULL,
    { M680X_INS_BCLR, M680X_INS_BSET } },
  { // M680X_CPU_TYPE_RS08
    &g_rs08_inst_page1_table[0],
    { NULL, NULL },
    { 0, 0 },
    { 0x00, 0x00, 0x00 },
    { NULL, NULL, NULL },
    { 0, 0, 0 },
    &g_rs08_reg_byte_size[0],
    NULL,
    { M680X_INS_INVLD, M680X_INS_INVLD } },
  { // M680X_CPU_TYPE_HCS12X
    &g_cpu12_inst_page1_table[0],
    { NULL, NULL },
    { 0, 0 },
    { 0x18, 0x00, 0x00 },
    { &g_hcs12x_inst_page2_table[0], NULL, NULL },
    { ARR_SIZE(g_hcs12x_inst_page2_table), 0, 0 },
    &g_hcs12x_reg_byte_size[0],
    NULL,
    { M680X_INS_INVLD, M680X_INS_INVLD } },
};

static bool m680x_setup_internals(m680x_info *info, e_cpu_type cpu_type,
          uint16_t address, const uint8_t *code,
          uint16_t code_len)
{
  if (cpu_type == M680X_CPU_TYPE_INVALID) {
    return false;
  }

  info->code = code;
  info->size = code_len;
  info->offset = address;
  info->cpu_type = cpu_type;

  info->cpu = &g_cpu_tables[info->cpu_type];

  return true;
}

bool M680X_getInstruction(csh ud, const uint8_t *code, size_t code_len,
        MCInst *MI, uint16_t *size, uint64_t address,
        void *inst_info)
{
  unsigned int insn_size = 0;
  e_cpu_type cpu_type = M680X_CPU_TYPE_INVALID; // No default CPU type
  cs_struct *handle = (cs_struct *)ud;
  m680x_info *info = (m680x_info *)handle->printer_info;

  MCInst_clear(MI);

  if (handle->mode & CS_MODE_M680X_6800)
    cpu_type = M680X_CPU_TYPE_6800;

  else if (handle->mode & CS_MODE_M680X_6801)
    cpu_type = M680X_CPU_TYPE_6801;

  else if (handle->mode & CS_MODE_M680X_6805)
    cpu_type = M680X_CPU_TYPE_6805;

  else if (handle->mode & CS_MODE_M680X_6808)
    cpu_type = M680X_CPU_TYPE_6808;

  else if (handle->mode & CS_MODE_M680X_HCS08)
    cpu_type = M680X_CPU_TYPE_HCS08;

  else if (handle->mode & CS_MODE_M680X_6809)
    cpu_type = M680X_CPU_TYPE_6809;

  else if (handle->mode & CS_MODE_M680X_6301)
    cpu_type = M680X_CPU_TYPE_6301;

  else if (handle->mode & CS_MODE_M680X_6309)
    cpu_type = M680X_CPU_TYPE_6309;

  else if (handle->mode & CS_MODE_M680X_6811)
    cpu_type = M680X_CPU_TYPE_6811;

  else if (handle->mode & CS_MODE_M680X_CPU12)
    cpu_type = M680X_CPU_TYPE_CPU12;

  else if (handle->mode & CS_MODE_M680X_RS08)
    cpu_type = M680X_CPU_TYPE_RS08;

  else if (handle->mode & CS_MODE_M680X_HCS12X)
    cpu_type = M680X_CPU_TYPE_HCS12X;

  if (cpu_type != M680X_CPU_TYPE_INVALID &&
      m680x_setup_internals(info, cpu_type, (uint16_t)address, code,
          (uint16_t)code_len))
    insn_size = m680x_disassemble(MI, info, (uint16_t)address);

  if (insn_size == 0) {
    *size = 1;
    return false;
  }

  // Make sure we always stay within range
  if (insn_size > code_len) {
    *size = (uint16_t)code_len;
    return false;
  } else
    *size = (uint16_t)insn_size;

  return true;
}

cs_err M680X_disassembler_init(cs_struct *ud)
{
  if (M680X_REG_ENDING != ARR_SIZE(g_m6800_reg_byte_size)) {
    CS_ASSERT(M680X_REG_ENDING == ARR_SIZE(g_m6800_reg_byte_size));

    return CS_ERR_MODE;
  }

  if (M680X_REG_ENDING != ARR_SIZE(g_m6801_reg_byte_size)) {
    CS_ASSERT(M680X_REG_ENDING == ARR_SIZE(g_m6801_reg_byte_size));

    return CS_ERR_MODE;
  }

  if (M680X_REG_ENDING != ARR_SIZE(g_m6805_reg_byte_size)) {
    CS_ASSERT(M680X_REG_ENDING == ARR_SIZE(g_m6805_reg_byte_size));

    return CS_ERR_MODE;
  }

  if (M680X_REG_ENDING != ARR_SIZE(g_m6808_reg_byte_size)) {
    CS_ASSERT(M680X_REG_ENDING == ARR_SIZE(g_m6808_reg_byte_size));

    return CS_ERR_MODE;
  }

  if (M680X_REG_ENDING != ARR_SIZE(g_m6811_reg_byte_size)) {
    CS_ASSERT(M680X_REG_ENDING == ARR_SIZE(g_m6811_reg_byte_size));

    return CS_ERR_MODE;
  }

  if (M680X_REG_ENDING != ARR_SIZE(g_cpu12_reg_byte_size)) {
    CS_ASSERT(M680X_REG_ENDING == ARR_SIZE(g_cpu12_reg_byte_size));

    return CS_ERR_MODE;
  }

  if (M680X_REG_ENDING != ARR_SIZE(g_m6809_reg_byte_size)) {
    CS_ASSERT(M680X_REG_ENDING == ARR_SIZE(g_m6809_reg_byte_size));

    return CS_ERR_MODE;
  }

  if (M680X_REG_ENDING != ARR_SIZE(g_rs08_reg_byte_size)) {
    CS_ASSERT(M680X_REG_ENDING == ARR_SIZE(g_rs08_reg_byte_size));

    return CS_ERR_MODE;
  }

  if (M680X_REG_ENDING != ARR_SIZE(g_hcs12x_reg_byte_size)) {
    CS_ASSERT(M680X_REG_ENDING == ARR_SIZE(g_hcs12x_reg_byte_size));

    return CS_ERR_MODE;
  }

  if (M680X_INS_ENDING != ARR_SIZE(g_insn_props)) {
    CS_ASSERT(M680X_INS_ENDING == ARR_SIZE(g_insn_props));

    return CS_ERR_MODE;
  }

  if (M680X_CPU_TYPE_ENDING != ARR_SIZE(g_cpu_tables)) {
    CS_ASSERT(M680X_CPU_TYPE_ENDING == ARR_SIZE(g_cpu_tables));

    return CS_ERR_MODE;
  }

  if (HANDLER_ID_ENDING != ARR_SIZE(g_insn_handler)) {
    CS_ASSERT(HANDLER_ID_ENDING == ARR_SIZE(g_insn_handler));

    return CS_ERR_MODE;
  }

  if (ACCESS_MODE_ENDING != MATRIX_SIZE(g_access_mode_to_access)) {
    CS_ASSERT(ACCESS_MODE_ENDING ==
        MATRIX_SIZE(g_access_mode_to_access));

    return CS_ERR_MODE;
  }

  return CS_ERR_OK;
}

#ifndef CAPSTONE_DIET
void M680X_reg_access(const cs_insn *insn, cs_regs regs_read,
          uint8_t *regs_read_count, cs_regs regs_write,
          uint8_t *regs_write_count)
{
  if (insn->detail == NULL) {
    *regs_read_count = 0;
    *regs_write_count = 0;
  } else {
    *regs_read_count = insn->detail->regs_read_count;
    *regs_write_count = insn->detail->regs_write_count;

    memcpy(regs_read, insn->detail->regs_read,
           *regs_read_count * sizeof(insn->detail->regs_read[0]));
    memcpy(regs_write, insn->detail->regs_write,
           *regs_write_count * sizeof(insn->detail->regs_write[0]));
  }
}
#endif

#endif

Coverage Report

Created: 2026-06-06 06:15