ppc-opc.c

优龙2410linux2.6.8内核源代码

  { 5, 11, NULL, NULL, 0 },

  /* The SH field in an MD form instruction.  This is split.  */
#define SH6 (48)
#define SH6_MASK ((0x1f << 11) | (1 << 1))
  { 6, 1, insert_sh6, extract_sh6, 0 },

  /* The SI field in a D form instruction.  */
#define SI (49)
  { 16, 0, NULL, NULL, PPC_OPERAND_SIGNED },

  /* The SI field in a D form instruction when we accept a wide range
     of positive values.  */
#define SISIGNOPT (50)
  { 16, 0, NULL, NULL, PPC_OPERAND_SIGNED | PPC_OPERAND_SIGNOPT },

  /* The SPR field in an XFX form instruction.  This is flipped--the
     lower 5 bits are stored in the upper 5 and vice- versa.  */
#define SPR (51)
#define SPR_MASK (0x3ff << 11)
  { 10, 11, insert_spr, extract_spr, 0 },

  /* The BAT index number in an XFX form m[ft]ibat[lu] instruction.  */
#define SPRBAT (52)
#define SPRBAT_MASK (0x3 << 17)
  { 2, 17, NULL, NULL, 0 },

  /* The SPRG register number in an XFX form m[ft]sprg instruction.  */
#define SPRG (53)
#define SPRG_MASK (0x3 << 16)
  { 2, 16, NULL, NULL, 0 },

  /* The SR field in an X form instruction.  */
#define SR (54)
  { 4, 16, NULL, NULL, 0 },

  /* The SV field in a POWER SC form instruction.  */
#define SV (55)
  { 14, 2, NULL, NULL, 0 },

  /* The TBR field in an XFX form instruction.  This is like the SPR
     field, but it is optional.  */
#define TBR (56)
  { 10, 11, insert_tbr, extract_tbr, PPC_OPERAND_OPTIONAL },

  /* The TO field in a D or X form instruction.  */
#define TO (57)
#define TO_MASK (0x1f << 21)
  { 5, 21, NULL, NULL, 0 },

  /* The U field in an X form instruction.  */
#define U (58)
  { 4, 12, NULL, NULL, 0 },

  /* The UI field in a D form instruction.  */
#define UI (59)
  { 16, 0, NULL, NULL, 0 },
};

/* The functions used to insert and extract complicated operands.  */

/* The BA field in an XL form instruction when it must be the same as
   the BT field in the same instruction.  This operand is marked FAKE.
   The insertion function just copies the BT field into the BA field,
   and the extraction function just checks that the fields are the
   same.  */

/*ARGSUSED*/
static unsigned long
insert_bat(unsigned long insn, long value, const char **errmsg)
{
  return insn | (((insn >> 21) & 0x1f) << 16);
}

static long
extract_bat(unsigned long insn, int *invalid)
{
  if (invalid != (int *) NULL
      && ((insn >> 21) & 0x1f) != ((insn >> 16) & 0x1f))
    *invalid = 1;
  return 0;
}

/* The BB field in an XL form instruction when it must be the same as
   the BA field in the same instruction.  This operand is marked FAKE.
   The insertion function just copies the BA field into the BB field,
   and the extraction function just checks that the fields are the
   same.  */

/*ARGSUSED*/
static unsigned long
insert_bba(unsigned long insn, long value, const char **errmsg)
{
  return insn | (((insn >> 16) & 0x1f) << 11);
}

static long
extract_bba(unsigned long insn, int *invalid)
{
  if (invalid != (int *) NULL
      && ((insn >> 16) & 0x1f) != ((insn >> 11) & 0x1f))
    *invalid = 1;
  return 0;
}

/* The BD field in a B form instruction.  The lower two bits are
   forced to zero.  */

/*ARGSUSED*/
static unsigned long
insert_bd(unsigned long insn, long value, const char **errmsg)
{
  return insn | (value & 0xfffc);
}

/*ARGSUSED*/
static long
extract_bd(unsigned long insn, int *invalid)
{
  if ((insn & 0x8000) != 0)
    return (insn & 0xfffc) - 0x10000;
  else
    return insn & 0xfffc;
}

/* The BD field in a B form instruction when the - modifier is used.
   This modifier means that the branch is not expected to be taken.
   We must set the y bit of the BO field to 1 if the offset is
   negative.  When extracting, we require that the y bit be 1 and that
   the offset be positive, since if the y bit is 0 we just want to
   print the normal form of the instruction.  */

/*ARGSUSED*/
static unsigned long
insert_bdm(unsigned long insn, long value, const char **errmsg)
{
  if ((value & 0x8000) != 0)
    insn |= 1 << 21;
  return insn | (value & 0xfffc);
}

static long
extract_bdm(unsigned long insn, int *invalid)
{
  if (invalid != (int *) NULL
      && ((insn & (1 << 21)) == 0
	  || (insn & (1 << 15)) == 0))
    *invalid = 1;
  if ((insn & 0x8000) != 0)
    return (insn & 0xfffc) - 0x10000;
  else
    return insn & 0xfffc;
}

/* The BD field in a B form instruction when the + modifier is used.
   This is like BDM, above, except that the branch is expected to be
   taken.  */

/*ARGSUSED*/
static unsigned long
insert_bdp(unsigned long insn, long value, const char **errmsg)
{
  if ((value & 0x8000) == 0)
    insn |= 1 << 21;
  return insn | (value & 0xfffc);
}

static long
extract_bdp(unsigned long insn, int *invalid)
{
  if (invalid != (int *) NULL
      && ((insn & (1 << 21)) == 0
	  || (insn & (1 << 15)) != 0))
    *invalid = 1;
  if ((insn & 0x8000) != 0)
    return (insn & 0xfffc) - 0x10000;
  else
    return insn & 0xfffc;
}

/* Check for legal values of a BO field.  */

static int
valid_bo (long value)
{
  /* Certain encodings have bits that are required to be zero.  These
     are (z must be zero, y may be anything):
         001zy
	 011zy
	 1z00y
	 1z01y
	 1z1zz
     */
  switch (value & 0x14)
    {
    default:
    case 0:
      return 1;
    case 0x4:
      return (value & 0x2) == 0;
    case 0x10:
      return (value & 0x8) == 0;
    case 0x14:
      return value == 0x14;
    }
}

/* The BO field in a B form instruction.  Warn about attempts to set
   the field to an illegal value.  */

static unsigned long
insert_bo(unsigned long insn, long value, const char **errmsg)
{
  if (errmsg != (const char **) NULL
      && ! valid_bo (value))
    *errmsg = "invalid conditional option";
  return insn | ((value & 0x1f) << 21);
}

static long
extract_bo(unsigned long insn, int *invalid)
{
  long value;

  value = (insn >> 21) & 0x1f;
  if (invalid != (int *) NULL
      && ! valid_bo (value))
    *invalid = 1;
  return value;
}

/* The BO field in a B form instruction when the + or - modifier is
   used.  This is like the BO field, but it must be even.  When
   extracting it, we force it to be even.  */

static unsigned long
insert_boe(unsigned long insn, long value, const char **errmsg)
{
  if (errmsg != (const char **) NULL)
    {
      if (! valid_bo (value))
	*errmsg = "invalid conditional option";
      else if ((value & 1) != 0)
	*errmsg = "attempt to set y bit when using + or - modifier";
    }
  return insn | ((value & 0x1f) << 21);
}

static long
extract_boe(unsigned long insn, int *invalid)
{
  long value;

  value = (insn >> 21) & 0x1f;
  if (invalid != (int *) NULL
      && ! valid_bo (value))
    *invalid = 1;
  return value & 0x1e;
}

/* The DS field in a DS form instruction.  This is like D, but the
   lower two bits are forced to zero.  */

/*ARGSUSED*/
static unsigned long
insert_ds(unsigned long insn, long value, const char **errmsg)
{
  return insn | (value & 0xfffc);
}

/*ARGSUSED*/
static long
extract_ds(unsigned long insn, int *invalid)
{
  if ((insn & 0x8000) != 0)
    return (insn & 0xfffc) - 0x10000;
  else
    return insn & 0xfffc;
}

/* The LI field in an I form instruction.  The lower two bits are
   forced to zero.  */

/*ARGSUSED*/
static unsigned long
insert_li(unsigned long insn, long value, const char **errmsg)
{
  return insn | (value & 0x3fffffc);
}

/*ARGSUSED*/
static long
extract_li(unsigned long insn, int *invalid)
{
  if ((insn & 0x2000000) != 0)
    return (insn & 0x3fffffc) - 0x4000000;
  else
    return insn & 0x3fffffc;
}

/* The MB and ME fields in an M form instruction expressed as a single
   operand which is itself a bitmask.  The extraction function always
   marks it as invalid, since we never want to recognize an
   instruction which uses a field of this type.  */

static unsigned long
insert_mbe(unsigned long insn, long value, const char **errmsg)
{
  unsigned long uval;
  int mb, me;

  uval = value;

  if (uval == 0)
    {
      if (errmsg != (const char **) NULL)
	*errmsg = "illegal bitmask";
      return insn;
    }

  me = 31;
  while ((uval & 1) == 0)
    {
      uval >>= 1;
      --me;
    }