/* FR30 opcode support.  -*- C -*-
   Copyright (C) 2000 Red Hat, Inc.
   This file is part of CGEN.  */

/* This file is an addendum to fr30.cpu.  Heavy use of C code isn't
   appropriate in .cpu files, so it resides here.  This especially applies
   to assembly/disassembly where parsing/printing can be quite involved.
   Such things aren't really part of the specification of the cpu, per se,
   so .cpu files provide the general framework and .opc files handle the
   nitty-gritty details as necessary.

   Each section is delimited with start and end markers.

   <arch>-opc.h additions use: "-- opc.h"
   <arch>-opc.c additions use: "-- opc.c"
   <arch>-asm.c additions use: "-- asm.c"
   <arch>-dis.c additions use: "-- dis.c"
   <arch>-ibd.h additions use: "-- ibd.h"
*/

/* -- opc.h */

/* ??? This can be improved upon.  */
#undef CGEN_DIS_HASH_SIZE
#define CGEN_DIS_HASH_SIZE 16
#undef CGEN_DIS_HASH
#define CGEN_DIS_HASH(buffer, value) (((unsigned char *) (buffer))[0] >> 4)

/* -- */

/* -- asm.c */
/* Handle register lists for LDMx and STMx  */

static int
parse_register_number (strp)
     const char **strp;
{
  int regno;
  if (**strp < '0' || **strp > '9')
    return -1; /* error */
  regno = **strp - '0';
  ++*strp;

  if (**strp >= '0' && **strp <= '9')
    {
      regno = regno * 10 + (**strp - '0');
      ++*strp;
    }

  return regno;
}

static const char *
parse_register_list (cd, strp, opindex, valuep, high_low, load_store)
     CGEN_CPU_DESC cd;
     const char **strp;
     int opindex;
     unsigned long *valuep;
     int high_low;   /* 0 == high, 1 == low */
     int load_store; /* 0 == load, 1 == store */
{
  int regno;
  *valuep = 0;
  while (**strp && **strp != ')')
    {
      if (**strp != 'R' && **strp != 'r')
	break;
      ++*strp;

      regno = parse_register_number (strp);
      if (regno == -1)
	return "Register number is not valid";
      if (regno > 7 && !high_low)
	return "Register must be between r0 and r7";
      if (regno < 8 && high_low)
	return "Register must be between r8 and r15";

      if (high_low)
	regno -= 8;

      if (load_store) /* mask is reversed for store */
	*valuep |= 0x80 >> regno;
      else
	*valuep |= 1 << regno;

      if (**strp == ',')
	{
	  if (*(*strp + 1) == ')')
	    break;
	  ++*strp;
	}
    }

  if (!*strp || **strp != ')')
    return "Register list is not valid";

  return NULL;
}

static const char *
parse_low_register_list_ld (cd, strp, opindex, valuep)
     CGEN_CPU_DESC cd;
     const char **strp;
     int opindex;
     unsigned long *valuep;
{
  return parse_register_list (cd, strp, opindex, valuep, 0/*low*/, 0/*load*/);
}

static const char *
parse_hi_register_list_ld (cd, strp, opindex, valuep)
     CGEN_CPU_DESC cd;
     const char **strp;
     int opindex;
     unsigned long *valuep;
{
  return parse_register_list (cd, strp, opindex, valuep, 1/*high*/, 0/*load*/);
}

static const char *
parse_low_register_list_st (cd, strp, opindex, valuep)
     CGEN_CPU_DESC cd;
     const char **strp;
     int opindex;
     unsigned long *valuep;
{
  return parse_register_list (cd, strp, opindex, valuep, 0/*low*/, 1/*store*/);
}

static const char *
parse_hi_register_list_st (cd, strp, opindex, valuep)
     CGEN_CPU_DESC cd;
     const char **strp;
     int opindex;
     unsigned long *valuep;
{
  return parse_register_list (cd, strp, opindex, valuep, 1/*high*/, 1/*store*/);
}

/* -- */

/* -- dis.c */

static void
print_register_list (dis_info, value, offset, load_store)
     PTR dis_info;
     long value;
     long offset;
     int load_store; /* 0 == load, 1 == store */
{
  disassemble_info *info = dis_info;
  int mask;
  int index = 0;
  char* comma = "";

  if (load_store)
    mask = 0x80;
  else
    mask = 1;

  if (value & mask)
    {
      (*info->fprintf_func) (info->stream, "r%i", index + offset);
      comma = ",";
    }
    
  for (index = 1; index <= 7; ++index)
    {
      if (load_store)
	mask >>= 1;
      else
	mask <<= 1;

      if (value & mask)
	{
	  (*info->fprintf_func) (info->stream, "%sr%i", comma, index + offset);
	  comma = ",";
	}
    }
}

static void
print_hi_register_list_ld (cd, dis_info, value, attrs, pc, length)
     CGEN_CPU_DESC cd;
     PTR dis_info;
     long value;
     unsigned int attrs;
     bfd_vma pc;
     int length;
{
  print_register_list (dis_info, value, 8, 0/*load*/);
}

static void
print_low_register_list_ld (cd, dis_info, value, attrs, pc, length)
     CGEN_CPU_DESC cd;
     PTR dis_info;
     long value;
     unsigned int attrs;
     bfd_vma pc;
     int length;
{
  print_register_list (dis_info, value, 0, 0/*load*/);
}

static void
print_hi_register_list_st (cd, dis_info, value, attrs, pc, length)
     CGEN_CPU_DESC cd;
     PTR dis_info;
     long value;
     unsigned int attrs;
     bfd_vma pc;
     int length;
{
  print_register_list (dis_info, value, 8, 1/*store*/);
}

static void
print_low_register_list_st (cd, dis_info, value, attrs, pc, length)
     CGEN_CPU_DESC cd;
     PTR dis_info;
     long value;
     unsigned int attrs;
     bfd_vma pc;
     int length;
{
  print_register_list (dis_info, value, 0, 1/*store*/);
}

static void
print_m4 (cd, dis_info, value, attrs, pc, length)
     CGEN_CPU_DESC cd;
     PTR dis_info;
     long value;
     unsigned int attrs;
     bfd_vma pc;
     int length;
{
  disassemble_info *info = (disassemble_info *) dis_info;
  (*info->fprintf_func) (info->stream, "%ld", value);
}
/* -- */