/* HP PA-RISC SOM object file format:  definitions internal to BFD.
   Copyright (C) 1990, 91, 92, 93, 94, 95, 96, 98, 1999
   Free Software Foundation, Inc.

   Contributed by the Center for Software Science at the
   University of Utah (pa-gdb-bugs@cs.utah.edu).

   This file is part of BFD, the Binary File Descriptor library.

   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 2 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, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */

#ifndef _HPPA_H
#define _HPPA_H

#define BYTES_IN_WORD 4
#define PA_PAGESIZE 0x1000

#ifndef INLINE
#ifdef __GNUC__
#define INLINE inline
#else
#define INLINE
#endif /* GNU C? */
#endif /* INLINE */

#if __GNUC__ >= 2 && __GNUC_MINOR__ >= 7
/* Declare the functions with the unused attribute to avoid warnings.  */
static INLINE unsigned int assemble_3 (unsigned int)
     __attribute__ ((__unused__));
static INLINE void dis_assemble_3 (unsigned int, unsigned int *)
     __attribute__ ((__unused__));
static INLINE unsigned int assemble_12 (unsigned int, unsigned int)
     __attribute__ ((__unused__));
static INLINE void dis_assemble_12 (unsigned int, unsigned int *,
				    unsigned int *)
     __attribute__ ((__unused__));
static INLINE unsigned long assemble_17 (unsigned int, unsigned int,
					 unsigned int)
     __attribute__ ((__unused__));
static INLINE void dis_assemble_17 (unsigned int, unsigned int *,
				    unsigned int *, unsigned int *)
     __attribute__ ((__unused__));
static INLINE unsigned long assemble_21 (unsigned int)
     __attribute ((__unused__));
static INLINE void dis_assemble_21 (unsigned int, unsigned int *)
     __attribute__ ((__unused__));
static INLINE unsigned long sign_extend (unsigned int, unsigned int)
     __attribute__ ((__unused__));
static INLINE unsigned int ones (int) __attribute ((__unused__));
static INLINE void sign_unext (unsigned int, unsigned int, unsigned int *)
     __attribute__ ((__unused__));
static INLINE unsigned long low_sign_extend (unsigned int, unsigned int)
     __attribute__ ((__unused__));
static INLINE void low_sign_unext (unsigned int, unsigned int, unsigned int *)
     __attribute__ ((__unused__));
static INLINE unsigned long hppa_field_adjust (unsigned long, unsigned long,
					       unsigned short)
     __attribute__ ((__unused__));
static INLINE char bfd_hppa_insn2fmt (unsigned long)
     __attribute__ ((__unused__));
static INLINE  unsigned long hppa_rebuild_insn (bfd *, unsigned long,
						unsigned long, unsigned long)
     __attribute__ ((__unused__));
#endif /* gcc 2.7 or higher */


/* The PA instruction set variants.  */
enum pa_arch {pa10 = 10, pa11 = 11, pa20 = 20};

/* HP PA-RISC relocation types */

enum hppa_reloc_field_selector_type
  {
    R_HPPA_FSEL = 0x0,
    R_HPPA_LSSEL = 0x1,
    R_HPPA_RSSEL = 0x2,
    R_HPPA_LSEL = 0x3,
    R_HPPA_RSEL = 0x4,
    R_HPPA_LDSEL = 0x5,
    R_HPPA_RDSEL = 0x6,
    R_HPPA_LRSEL = 0x7,
    R_HPPA_RRSEL = 0x8,
    R_HPPA_NSEL  = 0x9,
    R_HPPA_NLSEL  = 0xa,
    R_HPPA_NLRSEL  = 0xb,
    R_HPPA_PSEL = 0xc,
    R_HPPA_LPSEL = 0xd,
    R_HPPA_RPSEL = 0xe,
    R_HPPA_TSEL = 0xf,
    R_HPPA_LTSEL = 0x10,
    R_HPPA_RTSEL = 0x11,
    R_HPPA_LTPSEL = 0x12,
    R_HPPA_RTPSEL = 0x13
  };

/* /usr/include/reloc.h defines these to constants.  We want to use
   them in enums, so #undef them before we start using them.  We might
   be able to fix this another way by simply managing not to include
   /usr/include/reloc.h, but currently GDB picks up these defines
   somewhere.  */
#undef e_fsel
#undef e_lssel
#undef e_rssel
#undef e_lsel
#undef e_rsel
#undef e_ldsel
#undef e_rdsel
#undef e_lrsel
#undef e_rrsel
#undef e_nsel
#undef e_nlsel
#undef e_nlrsel
#undef e_psel
#undef e_lpsel
#undef e_rpsel
#undef e_tsel
#undef e_ltsel
#undef e_rtsel
#undef e_one
#undef e_two
#undef e_pcrel
#undef e_con
#undef e_plabel
#undef e_abs

/* for compatibility */
enum hppa_reloc_field_selector_type_alt
  {
    e_fsel = R_HPPA_FSEL,
    e_lssel = R_HPPA_LSSEL,
    e_rssel = R_HPPA_RSSEL,
    e_lsel = R_HPPA_LSEL,
    e_rsel = R_HPPA_RSEL,
    e_ldsel = R_HPPA_LDSEL,
    e_rdsel = R_HPPA_RDSEL,
    e_lrsel = R_HPPA_LRSEL,
    e_rrsel = R_HPPA_RRSEL,
    e_nsel = R_HPPA_NSEL,
    e_nlsel = R_HPPA_NLSEL,
    e_nlrsel = R_HPPA_NLRSEL,
    e_psel = R_HPPA_PSEL,
    e_lpsel = R_HPPA_LPSEL,
    e_rpsel = R_HPPA_RPSEL,
    e_tsel = R_HPPA_TSEL,
    e_ltsel = R_HPPA_LTSEL,
    e_rtsel = R_HPPA_RTSEL,
    e_ltpsel = R_HPPA_LTPSEL,
    e_rtpsel = R_HPPA_RTPSEL
  };

enum hppa_reloc_expr_type
  {
    R_HPPA_E_ONE = 0,
    R_HPPA_E_TWO = 1,
    R_HPPA_E_PCREL = 2,
    R_HPPA_E_CON = 3,
    R_HPPA_E_PLABEL = 7,
    R_HPPA_E_ABS = 18
  };

/* for compatibility */
enum hppa_reloc_expr_type_alt
  {
    e_one = R_HPPA_E_ONE,
    e_two = R_HPPA_E_TWO,
    e_pcrel = R_HPPA_E_PCREL,
    e_con = R_HPPA_E_CON,
    e_plabel = R_HPPA_E_PLABEL,
    e_abs = R_HPPA_E_ABS
  };


/* Relocations for function calls must be accompanied by parameter
   relocation bits.  These bits describe exactly where the caller has
   placed the function's arguments and where it expects to find a return
   value.

   Both ELF and SOM encode this information within the addend field
   of the call relocation.  (Note this could break very badly if one
   was to make a call like bl foo + 0x12345678).

   The high order 10 bits contain parameter relocation information,
   the low order 22 bits contain the constant offset.  */
   
#define HPPA_R_ARG_RELOC(a)	(((a) >> 22) & 0x3FF)
#define HPPA_R_CONSTANT(a)	((((int)(a)) << 10) >> 10)
#define HPPA_R_ADDEND(r,c)	(((r) << 22) + ((c) & 0x3FFFFF))
#define HPPA_WIDE	       (0) /* PSW W-bit, need to check! FIXME */

/* These macros get bit fields using HP's numbering (MSB = 0),
 * but note that "MASK" assumes that the LSB bits are what's
 * wanted.
 */
#ifndef GET_FIELD
#define GET_FIELD(X, FROM, TO) \
  ((X) >> (31 - (TO)) & ((1 << ((TO) - (FROM) + 1)) - 1))
#endif  
#define GET_BIT(X, WHICH) \
  GET_FIELD (X, WHICH, WHICH)

#define MASK(SIZE) \
  (~((-1) << SIZE))
  
#define CATENATE(X, XSIZE, Y, YSIZE) \
  (((X & MASK (XSIZE)) << YSIZE) | (Y & MASK (YSIZE)))

#define ELEVEN(X) \
  CATENATE (GET_BIT (X, 10), 1, GET_FIELD (X, 0, 9), 10)
  
/* Some functions to manipulate PA instructions.  */

/* NOTE: these use the HP convention that f{1} is the _left_ most
 *       bit (MSB) of f; they sometimes have to impose an assumption
 *       about the size of a field; and as far as I can tell, most
 *       aren't used.
 */

static INLINE unsigned long
sign_extend (x, len)
     unsigned int x, len;
{
  return (int)(x >> (len - 1) ? (-1 << len) | x : x);
}

static INLINE unsigned int
assemble_3 (x)
     unsigned int x;
{
  return CATENATE (GET_BIT (x, 2), 1, GET_FIELD (x, 0, 1), 2);
}

static INLINE void
dis_assemble_3 (x, r)
     unsigned int x;
     unsigned int *r;
{
  *r = (((x & 4) >> 2) | ((x & 3) << 1)) & 7;
}

static INLINE unsigned int
assemble_6 (x, y)
     unsigned int x, y;
{
  return (((x & 0x1) << 5) + (32 - (y & 0x1f)));
}

static INLINE unsigned int
assemble_12 (x, y)
     unsigned int x, y;
{
  return CATENATE (CATENATE (y, 1, GET_BIT (x, 10), 1), 2,
 		   GET_FIELD (x, 0, 9), 9);
}

static INLINE void
dis_assemble_12 (as12, x, y)
     unsigned int as12;
     unsigned int *x, *y;
{
  *y = (as12 & 0x800) >> 11;
  *x = ((as12 & 0x3ff) << 1) | ((as12 & 0x400) >> 10);
}

static INLINE unsigned long
assemble_16 (x, y)
     unsigned int x, y;
{
  /* Depends on PSW W-bit !*/
  unsigned int temp;

  if (HPPA_WIDE)
    temp = CATENATE (CATENATE (GET_BIT (y, 13), 1,
			       (GET_BIT (y, 13) ^ GET_BIT (x, 0)), 1), 2,
		     CATENATE ((GET_BIT (y, 13) ^ GET_BIT (x, 1)), 1,
			       GET_FIELD (y, 0, 12), 13), 14);
  else
    temp = CATENATE (CATENATE (GET_BIT (y, 13), 1, GET_BIT (y, 13), 1), 2,
		     CATENATE (GET_BIT (y, 13), 1, GET_FIELD (y, 0, 12), 13), 14);

  return sign_extend (temp, 16);
}


static INLINE unsigned long
assemble_16a (x, y, z)
     unsigned int x, y, z;
{
  /* Depends on PSW W-bit !*/
  unsigned int temp;

  if (HPPA_WIDE)
    temp = CATENATE (CATENATE (z, 1, (z ^ GET_BIT (x, 0)), 1), 2,
		     CATENATE ((z ^ GET_BIT (x, 1)), 1, y, 11), 12);
  else 
      temp = CATENATE (CATENATE (z, 1, z, 1), 2, CATENATE (z, 1, y, 11), 12);

  return sign_extend ((temp << 2), 16);
}

static INLINE unsigned long
assemble_17 (x, y, z)
     unsigned int x, y, z;
{
  unsigned long temp;

  temp = CATENATE (CATENATE (z, 1, x, 5), 6,
		   CATENATE (GET_BIT (y, 10), 1, GET_FIELD (y, 0, 9), 10), 11);
  
  return temp;
}

static INLINE void
dis_assemble_17 (as17, x, y, z)
     unsigned int as17;
     unsigned int *x, *y, *z;
{

  *z = (as17 & 0x10000) >> 16;
  *x = (as17 & 0x0f800) >> 11;
  *y = (((as17 & 0x00400) >> 10) | ((as17 & 0x3ff) << 1)) & 0x7ff;
}

static INLINE unsigned long
assemble_21 (x)
     unsigned int x;
{
  unsigned long temp;

  temp = ((x & 1) << 20) |
    ((x & 0xffe) << 8) |
    ((x & 0xc000) >> 7) |
    ((x & 0x1f0000) >> 14) |
    ((x & 0x003000) >> 12);
  return temp & 0x1fffff;
}

static INLINE unsigned long
assemble_22 (a,b,c,d)
     unsigned int a,b,c,d;
{
  unsigned long temp;
  
  temp = CATENATE (CATENATE (d, 1, a, 5), 6,
		   CATENATE (b, 5, ELEVEN (c), 11), 16);

  return sign_extend (temp, 22);
}

static INLINE void
dis_assemble_21 (as21, x)
     unsigned int as21, *x;
{
  unsigned long temp;


  temp = (as21 & 0x100000) >> 20;
  temp |= (as21 & 0x0ffe00) >> 8;
  temp |= (as21 & 0x000180) << 7;
  temp |= (as21 & 0x00007c) << 14;
  temp |= (as21 & 0x000003) << 12;
  *x = temp;
}

static INLINE unsigned int
ones (n)
     int n;
{
  unsigned int len_ones;
  int i;

  i = 0;
  len_ones = 0;
  while (i < n)
    {
      len_ones = (len_ones << 1) | 1;
      i++;
    }

  return len_ones;
}

static INLINE void
sign_unext (x, len, result)
     unsigned int x, len;
     unsigned int *result;
{
  unsigned int len_ones;

  len_ones = ones (len);

  *result = x & len_ones;
}

static INLINE unsigned long
low_sign_extend (x, len)
     unsigned int x, len;
{
  return (int)((x & 0x1 ? (-1 << (len - 1)) : 0) | x >> 1);
}

static INLINE void
low_sign_unext (x, len, result)
     unsigned int x, len;
     unsigned int *result;
{
  unsigned int temp;
  unsigned int sign;
  unsigned int rest;
  unsigned int one_bit_at_len;
  unsigned int len_ones;

  len_ones = ones (len);
  one_bit_at_len = 1 << (len - 1);

  sign_unext (x, len, &temp);
  sign = temp & one_bit_at_len;
  sign >>= (len - 1);

  rest = temp & (len_ones ^ one_bit_at_len);
  rest <<= 1;

  *result = rest | sign;
}

/* Handle field selectors for PA instructions.  */

static INLINE unsigned long
hppa_field_adjust (value, constant_value, r_field)
     unsigned long value;
     unsigned long constant_value;
     unsigned short r_field;
{
  switch (r_field)
    {
    case e_fsel:		/* F  : no change		      */
    case e_nsel:		/* N  : no change		       */
      value += constant_value;
      break;

    case e_lssel:		/* LS : if (bit 21) then add 0x800
				   arithmetic shift right 11 bits */
      value += constant_value;
      if (value & 0x00000400)
	value += 0x800;
      value = (value & 0xfffff800) >> 11;
      break;

    case e_rssel:		/* RS : Sign extend from bit 21	*/
      value += constant_value;
      if (value & 0x00000400)
	value |= 0xfffff800;
      else
	value &= 0x7ff;
      break;

    case e_lsel:		/* L  : Arithmetic shift right 11 bits */
    case e_nlsel:		/* NL  : Arithmetic shift right 11 bits */
      value += constant_value;
      value = (value & 0xfffff800) >> 11;
      break;

    case e_rsel:		/* R  : Set bits 0-20 to zero	  */
      value += constant_value;
      value = value & 0x7ff;
      break;

    case e_ldsel:		/* LD : Add 0x800, arithmetic shift
				   right 11 bits		  */
      value += constant_value;
      value += 0x800;
      value = (value & 0xfffff800) >> 11;
      break;

    case e_rdsel:		/* RD : Set bits 0-20 to one	   */
      value += constant_value;
      value |= 0xfffff800;
      break;

    case e_lrsel:		/* LR : L with "rounded" constant      */
    case e_nlrsel:		/* NLR : NL with "rounded" constant      */
      value = value + ((constant_value + 0x1000) & 0xffffe000);
      value = (value & 0xfffff800) >> 11;
      break;

    case e_rrsel:		/* RR : R with "rounded" constant      */
      value = value + ((constant_value + 0x1000) & 0xffffe000);
      value = (value & 0x7ff) + constant_value - ((constant_value + 0x1000) & 0xffffe000);
      break;

    default:
      abort ();
    }
  return value;

}

/* PA-RISC OPCODES */
#define get_opcode(insn)	((insn) & 0xfc000000) >> 26

/* FIXME: this list is incomplete.  It should also be an enumerated
   type rather than #defines.  */

#define LDO	0x0d
#define LDB	0x10
#define LDH	0x11
#define LDW	0x12
#define LDWM	0x13
#define STB	0x18
#define STH	0x19
#define STW	0x1a
#define STWM	0x1b
#define COMICLR	0x24
#define SUBI	0x25
#define SUBIO	0x25
#define ADDIT	0x2c
#define ADDITO	0x2c
#define ADDI	0x2d
#define ADDIO	0x2d
#define LDIL	0x08
#define ADDIL	0x0a

#define MOVB	0x32
#define MOVIB	0x33
#define COMBT	0x20
#define COMBF	0x22
#define COMIBT	0x21
#define COMIBF	0x23
#define ADDBT	0x28
#define ADDBF	0x2a
#define ADDIBT	0x29
#define ADDIBF	0x2b
#define BVB	0x30
#define BB	0x31

#define BL	0x3a
#define BLE	0x39
#define BE	0x38

  
/* Given a machine instruction, return its format.

   FIXME:  opcodes which do not map to a known format
   should return an error of some sort.  */

static INLINE char
bfd_hppa_insn2fmt (insn)
     unsigned long insn;
{
  char fmt = -1;
  unsigned char op = get_opcode (insn);
  
  switch (op)
    {
    case ADDI:
    case ADDIT:
    case SUBI:
      fmt = 11;
      break;
    case MOVB:
    case MOVIB:
    case COMBT:
    case COMBF:
    case COMIBT:
    case COMIBF:
    case ADDBT:
    case ADDBF:
    case ADDIBT:
    case ADDIBF:
    case BVB:
    case BB:
      fmt = 12;
      break;
    case LDO:
    case LDB:
    case LDH:
    case LDW:
    case LDWM:
    case STB:
    case STH:
    case STW:
    case STWM:
      fmt = 14;
      break;
    case BL:
    case BE:
    case BLE:
      fmt = 17;
      break;
    case LDIL:
    case ADDIL:
      fmt = 21;
      break;
    default:
      fmt = 32;
      break;
    }
  return fmt;
}


/* Insert VALUE into INSN using R_FORMAT to determine exactly what
   bits to change.  */
   
static INLINE unsigned long
hppa_rebuild_insn (abfd, insn, value, r_format)
     bfd *abfd ATTRIBUTE_UNUSED;
     unsigned long insn;
     unsigned long value;
     unsigned long r_format;
{
  unsigned long const_part;
  unsigned long rebuilt_part;

  switch (r_format)
    {
    case 11:
      {
	unsigned w1, w;

	const_part = insn & 0xffffe002;
	dis_assemble_12 (value, &w1, &w);
	rebuilt_part = (w1 << 2) | w;
	return const_part | rebuilt_part;
      }

    case 12:
      {
	unsigned w1, w;

	const_part = insn & 0xffffe002;
	dis_assemble_12 (value, &w1, &w);
	rebuilt_part = (w1 << 2) | w;
	return const_part | rebuilt_part;
      }

    case 14:
      {
	unsigned int ext;
	
	const_part = insn & 0xffffc000;
	low_sign_unext (value, 14, &ext);
	return const_part | ext;
      }

    case 17:
      {
	unsigned w1, w2, w;

	const_part = insn & 0xffe0e002;
	dis_assemble_17 (value, &w1, &w2, &w);
	rebuilt_part = (w2 << 2) | (w1 << 16) | w;
	return const_part | rebuilt_part;
      }

    case 21:
      {
	unsigned int w;

	const_part = insn & 0xffe00000;
	dis_assemble_21 (value, &w);
	return const_part | w;
      }

    case 32:
      const_part = 0;
      return value;

    default:
      abort ();
    }
  return insn;
}

#endif /* _HPPA_H */
