/* t90adr.c */

/*
 *  Copyright (C) 1989-2009  Alan R. Baldwin
 *
 *  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 3 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, see <http://www.gnu.org/licenses/>.
 *
 *
 * Alan R. Baldwin
 * 721 Berkeley St.
 * Kent, Ohio  44240
 */

/*
 * Extensions: P. Felber
 */

/*
 * TLCS90 Port: R. Keuchel
 */

#include "asxxxx.h"
#include "t90.h"

/*
 * Read an address specifier. Pack the
 * address information into the supplied
 * `expr' structure. Return the mode of
 * the address.
 *
 * This addr(esp) routine performs the following addressing decoding:
 *
 *      address         mode            flag            addr            base
 *      #n              S_IMMED         0               n               NULL
 *      label           s_type          ----            s_addr          s_area
 *      [REG]           S_IND+icode     0               0               NULL
 *      [label]         S_INDM          ----            s_addr          s_area
 *      offset[REG]     S_IND+icode     ----            offset          ----
 */

int
addr(esp)
struct expr *esp;
{
  int c, mode, indx;

  if ((c = getnb()) == '#') 
    {
      expr(esp, 0);
      esp->e_mode = S_IMMED;
    } 
  else if (c == LFIND)  // (
    {
      if ((indx = admode(R8)) != 0) 
        {
          mode = S_INDB;
        } 
      else if ((indx = admode(R16)) != 0) 
        {
          mode = S_INDR;
        } 
#if 0
      else if ((indx = admode(R8X)) != 0) 
        {
          mode = S_R8X;
          aerr();
        } 
#endif
      else if ((indx = admode(R16X)) != 0) 
        {
          mode = S_R16X;
          aerr();
        } 
      else 
        {
          mode = S_INDM;
          expr(esp, 0);
          esp->e_mode = mode;
        }
      if (indx) 
        {
          esp->e_mode = (mode + indx)&0xFF;
          esp->e_base.e_ap = NULL;
        }
      if ((c = getnb()) != RTIND) 
        {
          qerr();
        }
    } 
  else 
    {
      unget(c);
      if ((indx = admode(R8)) != 0) 
        {
          mode = S_R8;
        } 
      else if ((indx = admode(R16)) != 0) 
        {
          mode = S_R16;
        } 
#if 0
      else if ((indx = admode(R8X)) != 0) 
        {
          mode = S_R8X;
        } 
      else if ((indx = admode(R8U1)) != 0) 
        {
          mode = S_R8U1;
        } 
      else if ((indx = admode(R8U2)) != 0) 
        {
          mode = S_R8U2;
        } 
#endif
      else if ((indx = admode(R16X)) != 0) 
        {
          mode = S_R16X;
        } 
      else 
        {
          mode = S_USER;
          expr(esp, 0);
          esp->e_mode = mode;
        }

      if (indx) 
        {
          esp->e_addr = indx&0xFF;
          esp->e_mode = mode;
          esp->e_base.e_ap = NULL;
        }

      if ((c = getnb()) == LFIND) 
        {
          // TLCS-90 can handle sp as index reg.. (indx & 0xFF) == HL) experimental for HL+A
          if ((indx = admode(R16)) != 0 && ((indx & 0xFF) == IX || (indx & 0xFF) == IY || (indx & 0xFF) == SP  || (indx & 0xFF) == HL))
            {
              esp->e_mode = S_INDR + (indx & 0xFF);
            } 
          else 
            {
              aerr();
            }
          
          if ((c = getnb()) != RTIND)
            {
              qerr();
            }
        } 
      else 
        {
          unget(c);
        }
    }
  
  return (esp->e_mode);
}

/*
 * Enter admode() to search a specific addressing mode table
 * for a match. Return the addressing value on a match or
 * zero for no match.
 */
int
admode(struct adsym *sp)
{
  char *ptr;
  int i;
  char *ips;

  ips = ip;
  unget(getnb());

  i = 0;

  while ( *(ptr = &sp[i].a_str[0]) ) 
    {
      if (srch(ptr)) 
        {
          return(sp[i].a_val);
        }
      i++;
    }

  ip = ips;
  return(0);
}

/*
 *      srch --- does string match ?
 */
int
srch(str)
char *str;
{
  char *ptr;
  ptr = ip;

  while (*ptr && *str) 
    {
      if (ccase[*ptr & 0x007F] != ccase[*str & 0x007F])
        break;
      ptr++;
      str++;
    }

  if (ccase[*ptr & 0x007F] == ccase[*str & 0x007F]) 
    {
      ip = ptr;
      return(1);
    }

  if (!*str)
    {
      if (!(ctype[*ptr & 0x007F] & LTR16)) 
        {
          ip = ptr;
          return(1);
        }
    }
  return(0);
}

/*
 * Registers
 */

struct  adsym   R8[] = {
    {   "b",    B|0400  },
    {   "c",    C|0400  },
    {   "d",    D|0400  },
    {   "e",    E|0400  },
    {   "h",    H|0400  },
    {   "l",    L|0400  },
    {   "a",    A|0400  },
    {   "",     0000    }
};

#if 0
// valid for t90??
struct  adsym   R8X[] = {
    {   "i",    I|0400  },
    {   "r",    R|0400  },
    {   "",     0000    }
};

//valid for t90??
struct  adsym   R8U1[] = {
  {   "ixh",  H|0400  },
  {   "ixl",  L|0400  },
  {   "",     0000    }
};

//valid for t90??
struct  adsym   R8U2[] = {
  {   "iyh",  H|0400  },
  {   "iyl",  L|0400  },
  {   "",     0000    }
};
#endif

struct  adsym   R16[] = {
    {   "bc",   BC|0400 },
    {   "de",   DE|0400 },
    {   "hl",   HL|0400 },
    {   "sp",   SP|0400 },
    {   "ix",   IX|0400 },
    {   "iy",   IY|0400 },
    {   "af",   AF|4000 },
    {   "",     0000    }
};

struct  adsym   R16X[] = {
    {   "af'",  AF|0400 },      /* af' must be first !!! */
    {   "af",   AF|0400 },
    {   "",     0000    }
};

/*
 * Conditional definitions
 */

struct  adsym   CND[] = {
    {   "C",    CS|0400 },
    {   "EQ",   EQ|0400 },
    {   "F",    F|0400 },

    {   "GE",   GE|0400 },
    {   "GT",   GT|0400 },
    {   "LE",   LE|0400 },
    {   "LT",   LT|0400 },

    {   "M",    M |0400 },
    {   "MI",   M |0400 },

    {   "NC",   NC|0400 },
    {   "NE",   NE|0400 },

    {   "NOV",  NOV|0400 },
    {   "NZ",   NZ|0400 },

    {   "OV",   OV|0400 },
    {   "P",    P |0400 },
    {   "PE",   PE|0400 },
    {   "PL",   P |0400 },
    {   "PO",   PO|0400 },
    {   "T",    T|0400 },

    {   "UGE",  UGE|0400 },
    {   "UGT",  UGT|0400 },
    {   "ULE",  ULE|0400 },
    {   "ULT",  ULT|0400 },

    {   "Z",    Z |0400 },
    {   "",     0000    }
};