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/* Instruction building/extraction support for openrisc. -*- C -*-

THIS FILE IS MACHINE GENERATED WITH CGEN: Cpu tools GENerator.

- the resultant file is machine generated, cgen-ibld.in isn't

Copyright 1996, 1997, 1998, 1999, 2000, 2001 Free Software Foundation, Inc.

This file is part of the GNU Binutils and GDB, the GNU debugger.

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, 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.  */

/* ??? Eventually more and more of this stuff can go to cpu-independent files.

   Keep that in mind.  */

#include "sysdep.h"

#include <ctype.h>

#include <stdio.h>

#include "ansidecl.h"

#include "dis-asm.h"

#include "bfd.h"

#include "symcat.h"

#include "openrisc-desc.h"

#include "openrisc-opc.h"

#include "opintl.h"

#undef min

#define min(a,b) ((a) < (b) ? (a) : (b))

#undef max

#define max(a,b) ((a) > (b) ? (a) : (b))

/* Used by the ifield rtx function.  */

#define FLD(f) (fields->f)

static const char * insert_normal

     PARAMS ((CGEN_CPU_DESC, long, unsigned int, unsigned int, unsigned int,

              unsigned int, unsigned int, unsigned int, CGEN_INSN_BYTES_PTR));

static const char * insert_insn_normal

     PARAMS ((CGEN_CPU_DESC, const CGEN_INSN *,

              CGEN_FIELDS *, CGEN_INSN_BYTES_PTR, bfd_vma));

static int extract_normal

     PARAMS ((CGEN_CPU_DESC, CGEN_EXTRACT_INFO *, CGEN_INSN_INT,

              unsigned int, unsigned int, unsigned int, unsigned int,

              unsigned int, unsigned int, bfd_vma, long *));

static int extract_insn_normal

     PARAMS ((CGEN_CPU_DESC, const CGEN_INSN *, CGEN_EXTRACT_INFO *,

              CGEN_INSN_INT, CGEN_FIELDS *, bfd_vma));

static void put_insn_int_value

     PARAMS ((CGEN_CPU_DESC, CGEN_INSN_BYTES_PTR, int, int, CGEN_INSN_INT));

/* Operand insertion.  */

#if ! CGEN_INT_INSN_P

/* Subroutine of insert_normal.  */

static CGEN_INLINE void

insert_1 (cd, value, start, length, word_length, bufp)

     CGEN_CPU_DESC cd;

     unsigned long value;

     int start,length,word_length;

     unsigned char *bufp;

{

  unsigned long x,mask;

  int shift;

  int big_p = CGEN_CPU_INSN_ENDIAN (cd) == CGEN_ENDIAN_BIG;

  x = bfd_get_bits (bufp, word_length, big_p);

  /* Written this way to avoid undefined behaviour.  */

  mask = (((1L << (length - 1)) - 1) << 1) | 1;

  if (CGEN_INSN_LSB0_P)

    shift = (start + 1) - length;

  else

    shift = (word_length - (start + length));

  x = (x & ~(mask << shift)) | ((value & mask) << shift);

  bfd_put_bits ((bfd_vma) x, bufp, word_length, big_p);

}

#endif /* ! CGEN_INT_INSN_P */

/* Default insertion routine.

   ATTRS is a mask of the boolean attributes.

   WORD_OFFSET is the offset in bits from the start of the insn of the value.

   WORD_LENGTH is the length of the word in bits in which the value resides.

   START is the starting bit number in the word, architecture origin.

   LENGTH is the length of VALUE in bits.

   TOTAL_LENGTH is the total length of the insn in bits.

   The result is an error message or NULL if success.  */

/* ??? This duplicates functionality with bfd's howto table and

   bfd_install_relocation.  */

/* ??? This doesn't handle bfd_vma's.  Create another function when

   necessary.  */

static const char *

insert_normal (cd, value, attrs, word_offset, start, length, word_length,

               total_length, buffer)

     CGEN_CPU_DESC cd;

     long value;

     unsigned int attrs;

     unsigned int word_offset, start, length, word_length, total_length;

     CGEN_INSN_BYTES_PTR buffer;

{

  static char errbuf[100];

  /* Written this way to avoid undefined behaviour.  */

  unsigned long mask = (((1L << (length - 1)) - 1) << 1) | 1;

  /* If LENGTH is zero, this operand doesn't contribute to the value.  */

  if (length == 0)

    return NULL;

#if 0

  if (CGEN_INT_INSN_P

      && word_offset != 0)

    abort ();

#endif

  if (word_length > 32)

    abort ();

  /* For architectures with insns smaller than the base-insn-bitsize,

     word_length may be too big.  */

  if (cd->min_insn_bitsize < cd->base_insn_bitsize)

    {

      if (word_offset == 0

          && word_length > total_length)

        word_length = total_length;

    }

  /* Ensure VALUE will fit.  */

  if (! CGEN_BOOL_ATTR (attrs, CGEN_IFLD_SIGNED))

    {

      unsigned long maxval = mask;

      if ((unsigned long) value > maxval)

        {

          /* xgettext:c-format */

          sprintf (errbuf,

                   _("operand out of range (%lu not between 0 and %lu)"),

                   value, maxval);

          return errbuf;

        }

    }

  else

    {

      if (! cgen_signed_overflow_ok_p (cd))

        {

          long minval = - (1L << (length - 1));

          long maxval =   (1L << (length - 1)) - 1;

          if (value < minval || value > maxval)

            {

              sprintf

                /* xgettext:c-format */

                (errbuf, _("operand out of range (%ld not between %ld and %ld)"),

                 value, minval, maxval);

              return errbuf;

            }

        }

    }

#if CGEN_INT_INSN_P

  {

    int shift;

    if (CGEN_INSN_LSB0_P)

      shift = (word_offset + start + 1) - length;

    else

      shift = total_length - (word_offset + start + length);

    *buffer = (*buffer & ~(mask << shift)) | ((value & mask) << shift);

  }

#else /* ! CGEN_INT_INSN_P */

  {

    unsigned char *bufp = (unsigned char *) buffer + word_offset / 8;

    insert_1 (cd, value, start, length, word_length, bufp);

  }

#endif /* ! CGEN_INT_INSN_P */

  return NULL;

}

/* Default insn builder (insert handler).

   The instruction is recorded in CGEN_INT_INSN_P byte order (meaning

   that if CGEN_INSN_BYTES_PTR is an int * and thus, the value is

   recorded in host byte order, otherwise BUFFER is an array of bytes

   and the value is recorded in target byte order).

   The result is an error message or NULL if success.  */

static const char *

insert_insn_normal (cd, insn, fields, buffer, pc)

     CGEN_CPU_DESC cd;

     const CGEN_INSN * insn;

     CGEN_FIELDS * fields;

     CGEN_INSN_BYTES_PTR buffer;

     bfd_vma pc;

{

  const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);

  unsigned long value;

  const CGEN_SYNTAX_CHAR_TYPE * syn;

  CGEN_INIT_INSERT (cd);

  value = CGEN_INSN_BASE_VALUE (insn);

  /* If we're recording insns as numbers (rather than a string of bytes),

     target byte order handling is deferred until later.  */

#if CGEN_INT_INSN_P

  put_insn_int_value (cd, buffer, cd->base_insn_bitsize,

                      CGEN_FIELDS_BITSIZE (fields), value);

#else

  cgen_put_insn_value (cd, buffer, min (cd->base_insn_bitsize,

                                        CGEN_FIELDS_BITSIZE (fields)),

                       value);

#endif /* ! CGEN_INT_INSN_P */

  /* ??? It would be better to scan the format's fields.

     Still need to be able to insert a value based on the operand though;

     e.g. storing a branch displacement that got resolved later.

     Needs more thought first.  */

  for (syn = CGEN_SYNTAX_STRING (syntax); * syn; ++ syn)

    {

      const char *errmsg;

      if (CGEN_SYNTAX_CHAR_P (* syn))

        continue;

      errmsg = (* cd->insert_operand) (cd, CGEN_SYNTAX_FIELD (*syn),

                                       fields, buffer, pc);

      if (errmsg)

        return errmsg;

    }

  return NULL;

}

/* Cover function to store an insn value into an integral insn.  Must go here

 because it needs <prefix>-desc.h for CGEN_INT_INSN_P.  */

static void

put_insn_int_value (cd, buf, length, insn_length, value)

     CGEN_CPU_DESC cd ATTRIBUTE_UNUSED;

     CGEN_INSN_BYTES_PTR buf;

     int length;

     int insn_length;

     CGEN_INSN_INT value;

{

  /* For architectures with insns smaller than the base-insn-bitsize,

     length may be too big.  */

  if (length > insn_length)

    *buf = value;

  else

    {

      int shift = insn_length - length;

      /* Written this way to avoid undefined behaviour.  */

      CGEN_INSN_INT mask = (((1L << (length - 1)) - 1) << 1) | 1;

      *buf = (*buf & ~(mask << shift)) | ((value & mask) << shift);

    }

}

/* Operand extraction.  */

#if ! CGEN_INT_INSN_P

/* Subroutine of extract_normal.

   Ensure sufficient bytes are cached in EX_INFO.

   OFFSET is the offset in bytes from the start of the insn of the value.

   BYTES is the length of the needed value.

   Returns 1 for success, 0 for failure.  */

static CGEN_INLINE int

fill_cache (cd, ex_info, offset, bytes, pc)

     CGEN_CPU_DESC cd;

     CGEN_EXTRACT_INFO *ex_info;

     int offset, bytes;

     bfd_vma pc;

{

  /* It's doubtful that the middle part has already been fetched so

     we don't optimize that case.  kiss.  */

  int mask;

  disassemble_info *info = (disassemble_info *) ex_info->dis_info;

  /* First do a quick check.  */

  mask = (1 << bytes) - 1;

  if (((ex_info->valid >> offset) & mask) == mask)

    return 1;

  /* Search for the first byte we need to read.  */

  for (mask = 1 << offset; bytes > 0; --bytes, ++offset, mask <<= 1)

    if (! (mask & ex_info->valid))

      break;

  if (bytes)

    {

      int status;

      pc += offset;

      status = (*info->read_memory_func)

        (pc, ex_info->insn_bytes + offset, bytes, info);

      if (status != 0)

        {

          (*info->memory_error_func) (status, pc, info);

          return 0;

        }

      ex_info->valid |= ((1 << bytes) - 1) << offset;

    }

  return 1;

}

/* Subroutine of extract_normal.  */

static CGEN_INLINE long

extract_1 (cd, ex_info, start, length, word_length, bufp, pc)

     CGEN_CPU_DESC cd;

     CGEN_EXTRACT_INFO *ex_info;

     int start,length,word_length;

     unsigned char *bufp;

     bfd_vma pc;

{

  unsigned long x;

  int shift;

  int big_p = CGEN_CPU_INSN_ENDIAN (cd) == CGEN_ENDIAN_BIG;

  x = bfd_get_bits (bufp, word_length, big_p);

  if (CGEN_INSN_LSB0_P)

    shift = (start + 1) - length;

  else

    shift = (word_length - (start + length));

  return x >> shift;

}

#endif /* ! CGEN_INT_INSN_P */

/* Default extraction routine.

   INSN_VALUE is the first base_insn_bitsize bits of the insn in host order,

   or sometimes less for cases like the m32r where the base insn size is 32

   but some insns are 16 bits.

   ATTRS is a mask of the boolean attributes.  We only need `SIGNED',

   but for generality we take a bitmask of all of them.

   WORD_OFFSET is the offset in bits from the start of the insn of the value.

   WORD_LENGTH is the length of the word in bits in which the value resides.

   START is the starting bit number in the word, architecture origin.

   LENGTH is the length of VALUE in bits.

   TOTAL_LENGTH is the total length of the insn in bits.

   Returns 1 for success, 0 for failure.  */

/* ??? The return code isn't properly used.  wip.  */

/* ??? This doesn't handle bfd_vma's.  Create another function when

   necessary.  */

static int

extract_normal (cd, ex_info, insn_value, attrs, word_offset, start, length,

                word_length, total_length, pc, valuep)

     CGEN_CPU_DESC cd;

#if ! CGEN_INT_INSN_P

     CGEN_EXTRACT_INFO *ex_info;

#else

     CGEN_EXTRACT_INFO *ex_info ATTRIBUTE_UNUSED;

#endif

     CGEN_INSN_INT insn_value;

     unsigned int attrs;

     unsigned int word_offset, start, length, word_length, total_length;

#if ! CGEN_INT_INSN_P

     bfd_vma pc;

#else

     bfd_vma pc ATTRIBUTE_UNUSED;

#endif

     long *valuep;

{

  CGEN_INSN_INT value, mask;

  /* If LENGTH is zero, this operand doesn't contribute to the value

     so give it a standard value of zero.  */

  if (length == 0)

    {

      *valuep = 0;

      return 1;

    }

#if 0

  if (CGEN_INT_INSN_P

      && word_offset != 0)

    abort ();

#endif

  if (word_length > 32)

    abort ();

  /* For architectures with insns smaller than the insn-base-bitsize,

     word_length may be too big.  */

  if (cd->min_insn_bitsize < cd->base_insn_bitsize)

    {

      if (word_offset == 0

          && word_length > total_length)

        word_length = total_length;

    }

  /* Does the value reside in INSN_VALUE?  */

  if (CGEN_INT_INSN_P || word_offset == 0)

    {

      if (CGEN_INSN_LSB0_P)

        value = insn_value >> ((word_offset + start + 1) - length);

      else

        value = insn_value >> (total_length - ( word_offset + start + length));

    }

#if ! CGEN_INT_INSN_P

  else

    {

      unsigned char *bufp = ex_info->insn_bytes + word_offset / 8;

      if (word_length > 32)

        abort ();

      if (fill_cache (cd, ex_info, word_offset / 8, word_length / 8, pc) == 0)

        return 0;

      value = extract_1 (cd, ex_info, start, length, word_length, bufp, pc);

    }

#endif /* ! CGEN_INT_INSN_P */

  /* Written this way to avoid undefined behaviour.  */

  mask = (((1L << (length - 1)) - 1) << 1) | 1;

  value &= mask;

  /* sign extend? */

  if (CGEN_BOOL_ATTR (attrs, CGEN_IFLD_SIGNED)

      && (value & (1L << (length - 1))))

    value |= ~mask;

  *valuep = value;

  return 1;

}

/* Default insn extractor.

   INSN_VALUE is the first base_insn_bitsize bits, translated to host order.

   The extracted fields are stored in FIELDS.

   EX_INFO is used to handle reading variable length insns.

   Return the length of the insn in bits, or 0 if no match,

   or -1 if an error occurs fetching data (memory_error_func will have

   been called).  */

static int

extract_insn_normal (cd, insn, ex_info, insn_value, fields, pc)

     CGEN_CPU_DESC cd;

     const CGEN_INSN *insn;

     CGEN_EXTRACT_INFO *ex_info;

     CGEN_INSN_INT insn_value;

     CGEN_FIELDS *fields;

     bfd_vma pc;

{

  const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);

  const CGEN_SYNTAX_CHAR_TYPE *syn;

  CGEN_FIELDS_BITSIZE (fields) = CGEN_INSN_BITSIZE (insn);

  CGEN_INIT_EXTRACT (cd);

  for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)

    {

      int length;

      if (CGEN_SYNTAX_CHAR_P (*syn))

        continue;

      length = (* cd->extract_operand) (cd, CGEN_SYNTAX_FIELD (*syn),

                                        ex_info, insn_value, fields, pc);

      if (length <= 0)

        return length;

    }

  /* We recognized and successfully extracted this insn.  */

  return CGEN_INSN_BITSIZE (insn);

}

/* machine generated code added here */

/* Main entry point for operand insertion.

   This function is basically just a big switch statement.  Earlier versions

   used tables to look up the function to use, but

   - if the table contains both assembler and disassembler functions then

     the disassembler contains much of the assembler and vice-versa,

   - there's a lot of inlining possibilities as things grow,

   - using a switch statement avoids the function call overhead.

   This function could be moved into `parse_insn_normal', but keeping it

   separate makes clear the interface between `parse_insn_normal' and each of

   the handlers.  It's also needed by GAS to insert operands that couldn't be

   resolved during parsing.

*/

const char *

openrisc_cgen_insert_operand (cd, opindex, fields, buffer, pc)

     CGEN_CPU_DESC cd;

     int opindex;

     CGEN_FIELDS * fields;

     CGEN_INSN_BYTES_PTR buffer;

     bfd_vma pc;

{

  const char * errmsg = NULL;

  unsigned int total_length = CGEN_FIELDS_BITSIZE (fields);

  switch (opindex)

    {

    case OPENRISC_OPERAND_ABS_26 :

      {

        long value = fields->f_abs26;

        value = ((unsigned int) (pc) >> (2));

        errmsg = insert_normal (cd, value, 0|(1<<CGEN_IFLD_SIGNED)|(1<<CGEN_IFLD_ABS_ADDR), 0, 25, 26, 32, total_length, buffer);

      }

      break;

    case OPENRISC_OPERAND_DISP_26 :

      {

        long value = fields->f_disp26;

        value = ((int) (((value) - (pc))) >> (2));

        errmsg = insert_normal (cd, value, 0|(1<<CGEN_IFLD_SIGNED)|(1<<CGEN_IFLD_PCREL_ADDR), 0, 25, 26, 32, total_length, buffer);

      }

      break;

    case OPENRISC_OPERAND_HI16 :

      errmsg = insert_normal (cd, fields->f_simm16, 0|(1<<CGEN_IFLD_SIGNED), 0, 15, 16, 32, total_length, buffer);

      break;

    case OPENRISC_OPERAND_LO16 :

      errmsg = insert_normal (cd, fields->f_lo16, 0|(1<<CGEN_IFLD_SIGNED), 0, 15, 16, 32, total_length, buffer);

      break;

    case OPENRISC_OPERAND_OP_F_23 :

      errmsg = insert_normal (cd, fields->f_op4, 0, 0, 23, 3, 32, total_length, buffer);

      break;

    case OPENRISC_OPERAND_OP_F_3 :

      errmsg = insert_normal (cd, fields->f_op5, 0, 0, 25, 5, 32, total_length, buffer);

      break;

    case OPENRISC_OPERAND_RA :

      errmsg = insert_normal (cd, fields->f_r2, 0, 0, 20, 5, 32, total_length, buffer);

      break;

    case OPENRISC_OPERAND_RB :

      errmsg = insert_normal (cd, fields->f_r3, 0, 0, 15, 5, 32, total_length, buffer);

      break;

    case OPENRISC_OPERAND_RD :

      errmsg = insert_normal (cd, fields->f_r1, 0, 0, 25, 5, 32, total_length, buffer);

      break;

    case OPENRISC_OPERAND_SIMM_16 :

      errmsg = insert_normal (cd, fields->f_simm16, 0|(1<<CGEN_IFLD_SIGNED), 0, 15, 16, 32, total_length, buffer);

      break;

    case OPENRISC_OPERAND_UI16NC :

      {

{

  FLD (f_i16_2) = ((((unsigned int) (FLD (f_i16nc)) >> (11))) & (31));

  FLD (f_i16_1) = ((FLD (f_i16nc)) & (2047));

}

        errmsg = insert_normal (cd, fields->f_i16_1, 0, 0, 10, 11, 32, total_length, buffer);

        if (errmsg)

          break;

        errmsg = insert_normal (cd, fields->f_i16_2, 0, 0, 25, 5, 32, total_length, buffer);

        if (errmsg)

          break;

      }

      break;

    case OPENRISC_OPERAND_UIMM_16 :

      errmsg = insert_normal (cd, fields->f_uimm16, 0, 0, 15, 16, 32, total_length, buffer);

      break;

    case OPENRISC_OPERAND_UIMM_5 :

      errmsg = insert_normal (cd, fields->f_uimm5, 0, 0, 4, 5, 32, total_length, buffer);

      break;

    default :

      /* xgettext:c-format */

      fprintf (stderr, _("Unrecognized field %d while building insn.\n"),

               opindex);

      abort ();

  }

  return errmsg;

}

/* Main entry point for operand extraction.

   The result is <= 0 for error, >0 for success.

   ??? Actual values aren't well defined right now.

   This function is basically just a big switch statement.  Earlier versions

   used tables to look up the function to use, but

   - if the table contains both assembler and disassembler functions then

     the disassembler contains much of the assembler and vice-versa,

   - there's a lot of inlining possibilities as things grow,

   - using a switch statement avoids the function call overhead.

   This function could be moved into `print_insn_normal', but keeping it

   separate makes clear the interface between `print_insn_normal' and each of

   the handlers.

*/

int

openrisc_cgen_extract_operand (cd, opindex, ex_info, insn_value, fields, pc)

     CGEN_CPU_DESC cd;

     int opindex;

     CGEN_EXTRACT_INFO *ex_info;

     CGEN_INSN_INT insn_value;

     CGEN_FIELDS * fields;

     bfd_vma pc;

{

  /* Assume success (for those operands that are nops).  */

  int length = 1;

  unsigned int total_length = CGEN_FIELDS_BITSIZE (fields);

  switch (opindex)

    {

    case OPENRISC_OPERAND_ABS_26 :

      {

        long value;

        length = extract_normal (cd, ex_info, insn_value, 0|(1<<CGEN_IFLD_SIGNED)|(1<<CGEN_IFLD_ABS_ADDR), 0, 25, 26, 32, total_length, pc, & value);

        value = ((value) << (2));

        fields->f_abs26 = value;

      }

      break;

    case OPENRISC_OPERAND_DISP_26 :

      {

        long value;

        length = extract_normal (cd, ex_info, insn_value, 0|(1<<CGEN_IFLD_SIGNED)|(1<<CGEN_IFLD_PCREL_ADDR), 0, 25, 26, 32, total_length, pc, & value);

        value = ((((value) << (2))) + (pc));

        fields->f_disp26 = value;

      }

      break;

    case OPENRISC_OPERAND_HI16 :

      length = extract_normal (cd, ex_info, insn_value, 0|(1<<CGEN_IFLD_SIGNED), 0, 15, 16, 32, total_length, pc, & fields->f_simm16);

      break;

    case OPENRISC_OPERAND_LO16 :

      length = extract_normal (cd, ex_info, insn_value, 0|(1<<CGEN_IFLD_SIGNED), 0, 15, 16, 32, total_length, pc, & fields->f_lo16);

      break;

    case OPENRISC_OPERAND_OP_F_23 :

      length = extract_normal (cd, ex_info, insn_value, 0, 0, 23, 3, 32, total_length, pc, & fields->f_op4);