m68k-dis.c

来自「基于4个mips核的noc设计」· C语言 代码 · 共 1,329 行 · 第 1/3 页

  if (*d)
    (*info->fprintf_func) (info->stream, " ");

  while (*d)
    {
      p += print_insn_arg (d, buffer, p, memaddr + (p - buffer), info);
      d += 2;
      if (*d && *(d - 2) != 'I' && *d != 'k')
	(*info->fprintf_func) (info->stream, ",");
    }
  return p - buffer;

 invalid:
  /* Handle undefined instructions.  */
  info->fprintf_func = save_printer;
  info->print_address_func = save_print_address;
  (*info->fprintf_func) (info->stream, "0%o",
			 (buffer[0] << 8) + buffer[1]);
  return 2;
}

/* Returns number of bytes "eaten" by the operand, or
   return -1 if an invalid operand was found, or -2 if
   an opcode tabe error was found. */

static int
print_insn_arg (d, buffer, p0, addr, info)
     const char *d;
     unsigned char *buffer;
     unsigned char *p0;
     bfd_vma addr;		/* PC for this arg to be relative to */
     disassemble_info *info;
{
  register int val = 0;
  register int place = d[1];
  register unsigned char *p = p0;
  int regno;
  register CONST char *regname;
  register unsigned char *p1;
  double flval;
  int flt_p;
  bfd_signed_vma disp;
  unsigned int uval;

  switch (*d)
    {
    case 'c':		/* cache identifier */
      {
        static char *const cacheFieldName[] = { "nc", "dc", "ic", "bc" };
        val = fetch_arg (buffer, place, 2, info);
        (*info->fprintf_func) (info->stream, cacheFieldName[val]);
        break;
      }

    case 'a':		/* address register indirect only. Cf. case '+'. */
      {
        (*info->fprintf_func)
	  (info->stream,
	   "%s@",
	   reg_names [fetch_arg (buffer, place, 3, info) + 8]);
        break;
      }

    case '_':		/* 32-bit absolute address for move16. */
      {
        uval = NEXTULONG (p);
	(*info->print_address_func) (uval, info);
        break;
      }

    case 'C':
      (*info->fprintf_func) (info->stream, "%%ccr");
      break;

    case 'S':
      (*info->fprintf_func) (info->stream, "%%sr");
      break;

    case 'U':
      (*info->fprintf_func) (info->stream, "%%usp");
      break;

    case 'E':
      (*info->fprintf_func) (info->stream, "%%acc");
      break;

    case 'G':
      (*info->fprintf_func) (info->stream, "%%macsr");
      break;

    case 'H':
      (*info->fprintf_func) (info->stream, "%%mask");
      break;

    case 'J':
      {
	static const struct { char *name; int value; } names[]
	  = {{"%sfc", 0x000}, {"%dfc", 0x001}, {"%cacr", 0x002},
	     {"%tc",  0x003}, {"%itt0",0x004}, {"%itt1", 0x005},
             {"%dtt0",0x006}, {"%dtt1",0x007}, {"%buscr",0x008},
	     {"%usp", 0x800}, {"%vbr", 0x801}, {"%caar", 0x802},
	     {"%msp", 0x803}, {"%isp", 0x804},

	     /* Should we be calling this psr like we do in case 'Y'?  */
	     {"%mmusr",0x805},

             {"%urp", 0x806}, {"%srp", 0x807}, {"%pcr", 0x808}};

	val = fetch_arg (buffer, place, 12, info);
	for (regno = sizeof names / sizeof names[0] - 1; regno >= 0; regno--)
	  if (names[regno].value == val)
	    {
	      (*info->fprintf_func) (info->stream, "%s", names[regno].name);
	      break;
	    }
	if (regno < 0)
	  (*info->fprintf_func) (info->stream, "%d", val);
      }
      break;

    case 'Q':
      val = fetch_arg (buffer, place, 3, info);
      /* 0 means 8, except for the bkpt instruction... */
      if (val == 0 && d[1] != 's')
	val = 8;
      (*info->fprintf_func) (info->stream, "#%d", val);
      break;

    case 'M':
      if (place == 'h')
	{
	  static char *const scalefactor_name[] = { "<<", ">>" };
	  val = fetch_arg (buffer, place, 1, info);
	  (*info->fprintf_func) (info->stream, scalefactor_name[val]);
	}
      else
	{
	  val = fetch_arg (buffer, place, 8, info);
	  if (val & 0x80)
	    val = val - 0x100;
	  (*info->fprintf_func) (info->stream, "#%d", val);
	}
      break;

    case 'T':
      val = fetch_arg (buffer, place, 4, info);
      (*info->fprintf_func) (info->stream, "#%d", val);
      break;

    case 'D':
      (*info->fprintf_func) (info->stream, "%s",
			     reg_names[fetch_arg (buffer, place, 3, info)]);
      break;

    case 'A':
      (*info->fprintf_func)
	(info->stream, "%s",
	 reg_names[fetch_arg (buffer, place, 3, info) + 010]);
      break;

    case 'R':
      (*info->fprintf_func)
	(info->stream, "%s",
	 reg_names[fetch_arg (buffer, place, 4, info)]);
      break;

    case 'r':
      regno = fetch_arg (buffer, place, 4, info);
      if (regno > 7)
	(*info->fprintf_func) (info->stream, "%s@", reg_names[regno]);
      else
	(*info->fprintf_func) (info->stream, "@(%s)", reg_names[regno]);
      break;

    case 'F':
      (*info->fprintf_func)
	(info->stream, "%%fp%d",
	 fetch_arg (buffer, place, 3, info));
      break;

    case 'O':
      val = fetch_arg (buffer, place, 6, info);
      if (val & 0x20)
	(*info->fprintf_func) (info->stream, "%s", reg_names [val & 7]);
      else
	(*info->fprintf_func) (info->stream, "%d", val);
      break;

    case '+':
      (*info->fprintf_func)
	(info->stream, "%s@+",
	 reg_names[fetch_arg (buffer, place, 3, info) + 8]);
      break;

    case '-':
      (*info->fprintf_func)
	(info->stream, "%s@-",
	 reg_names[fetch_arg (buffer, place, 3, info) + 8]);
      break;

    case 'k':
      if (place == 'k')
	(*info->fprintf_func)
	  (info->stream, "{%s}",
	   reg_names[fetch_arg (buffer, place, 3, info)]);
      else if (place == 'C')
	{
	  val = fetch_arg (buffer, place, 7, info);
	  if ( val > 63 )		/* This is a signed constant. */
	    val -= 128;
	  (*info->fprintf_func) (info->stream, "{#%d}", val);
	}
      else
	return -2;
      break;

    case '#':
    case '^':
      p1 = buffer + (*d == '#' ? 2 : 4);
      if (place == 's')
	val = fetch_arg (buffer, place, 4, info);
      else if (place == 'C')
	val = fetch_arg (buffer, place, 7, info);
      else if (place == '8')
	val = fetch_arg (buffer, place, 3, info);
      else if (place == '3')
	val = fetch_arg (buffer, place, 8, info);
      else if (place == 'b')
	val = NEXTBYTE (p1);
      else if (place == 'w' || place == 'W')
	val = NEXTWORD (p1);
      else if (place == 'l')
	val = NEXTLONG (p1);
      else
	return -2;
      (*info->fprintf_func) (info->stream, "#%d", val);
      break;

    case 'B':
      if (place == 'b')
	disp = NEXTBYTE (p);
      else if (place == 'B')
	disp = COERCE_SIGNED_CHAR(buffer[1]);
      else if (place == 'w' || place == 'W')
	disp = NEXTWORD (p);
      else if (place == 'l' || place == 'L' || place == 'C')
	disp = NEXTLONG (p);
      else if (place == 'g')
	{
	  disp = NEXTBYTE (buffer);
	  if (disp == 0)
	    disp = NEXTWORD (p);
	  else if (disp == -1)
	    disp = NEXTLONG (p);
	}
      else if (place == 'c')
	{
	  if (buffer[1] & 0x40)		/* If bit six is one, long offset */
	    disp = NEXTLONG (p);
	  else
	    disp = NEXTWORD (p);
	}
      else
	return -2;

      (*info->print_address_func) (addr + disp, info);
      break;

    case 'd':
      val = NEXTWORD (p);
      (*info->fprintf_func)
	(info->stream, "%s@(%d)",
	 reg_names[fetch_arg (buffer, place, 3, info) + 8], val);
      break;

    case 's':
      (*info->fprintf_func) (info->stream, "%s",
			     fpcr_names[fetch_arg (buffer, place, 3, info)]);
      break;

    case 'I':
      /* Get coprocessor ID... */
      val = fetch_arg (buffer, 'd', 3, info);
      
      if (val != 1)				/* Unusual coprocessor ID? */
	(*info->fprintf_func) (info->stream, "(cpid=%d) ", val);
      break;

    case '*':
    case '~':
    case '%':
    case ';':
    case '@':
    case '!':
    case '$':
    case '?':
    case '/':
    case '&':
    case '|':
    case '<':
    case '>':
    case 'm':
    case 'n':
    case 'o':
    case 'p':
    case 'q':
    case 'v':

      if (place == 'd')
	{
	  val = fetch_arg (buffer, 'x', 6, info);
	  val = ((val & 7) << 3) + ((val >> 3) & 7);
	}
      else
	val = fetch_arg (buffer, 's', 6, info);

      /* Get register number assuming address register.  */
      regno = (val & 7) + 8;
      regname = reg_names[regno];
      switch (val >> 3)
	{
	case 0:
	  (*info->fprintf_func) (info->stream, "%s", reg_names[val]);
	  break;

	case 1:
	  (*info->fprintf_func) (info->stream, "%s", regname);
	  break;

	case 2:
	  (*info->fprintf_func) (info->stream, "%s@", regname);
	  break;

	case 3:
	  (*info->fprintf_func) (info->stream, "%s@+", regname);
	  break;

	case 4:
	  (*info->fprintf_func) (info->stream, "%s@-", regname);
	  break;

	case 5:
	  val = NEXTWORD (p);
	  (*info->fprintf_func) (info->stream, "%s@(%d)", regname, val);
	  break;

	case 6:
	  p = print_indexed (regno, p, addr, info);
	  break;

	case 7:
	  switch (val & 7)
	    {
	    case 0:
	      val = NEXTWORD (p);
	      (*info->print_address_func) (val, info);
	      break;

	    case 1:
	      uval = NEXTULONG (p);
	      (*info->print_address_func) (uval, info);
	      break;

	    case 2:
	      val = NEXTWORD (p);
	      (*info->fprintf_func) (info->stream, "%%pc@(");
	      (*info->print_address_func) (addr + val, info);
	      (*info->fprintf_func) (info->stream, ")");
	      break;

	    case 3:
	      p = print_indexed (-1, p, addr, info);
	      break;

	    case 4:
	      flt_p = 1;	/* Assume it's a float... */
	      switch( place )
	      {
		case 'b':
		  val = NEXTBYTE (p);
		  flt_p = 0;
		  break;

		case 'w':
		  val = NEXTWORD (p);
		  flt_p = 0;
		  break;

		case 'l':
		  val = NEXTLONG (p);
		  flt_p = 0;
		  break;

		case 'f':
		  NEXTSINGLE(flval, p);
		  break;

		case 'F':
		  NEXTDOUBLE(flval, p);
		  break;

		case 'x':
		  NEXTEXTEND(flval, p);
		  break;

		case 'p':
		  flval = NEXTPACKED(p);
		  break;

		default:
		  return -1;
	      }
	      if ( flt_p )	/* Print a float? */
		(*info->fprintf_func) (info->stream, "#%g", flval);
	      else
		(*info->fprintf_func) (info->stream, "#%d", val);
	      break;

	    default:
	      return -1;
	    }
	}
      break;

    case 'L':
    case 'l':
	if (place == 'w')
	  {
	    char doneany;
	    p1 = buffer + 2;
	    val = NEXTWORD (p1);
	    /* Move the pointer ahead if this point is farther ahead
	       than the last.  */
	    p = p1 > p ? p1 : p;
	    if (val == 0)
	      {
		(*info->fprintf_func) (info->stream, "#0");
		break;
	      }
	    if (*d == 'l')
	      {
		register int newval = 0;