/* Disassembler interface for targets using CGEN. -*- C -*-
   CGEN: Cpu tools GENerator

   THIS FILE IS MACHINE GENERATED WITH CGEN.
   - the resultant file is machine generated, cgen-dis.in isn't

   Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2005
   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.,
   51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */

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

#include "sysdep.h"
#include <stdio.h>
#include "ansidecl.h"
#include "dis-asm.h"
#include "bfd.h"
#include "symcat.h"
#include "libiberty.h"
#include "arc-desc.h"
#include "arc-opc.h"
#include "opintl.h"

/* Prototypes */
int print_insn_arc (bfd_vma pc, disassemble_info *info);


/* Default text to print if an instruction isn't recognized.  */
#define UNKNOWN_INSN_MSG _("*unknown*")

static void print_normal
  (CGEN_CPU_DESC, void *, long, unsigned int, bfd_vma, int);
static void print_address
  (CGEN_CPU_DESC, void *, bfd_vma, unsigned int, bfd_vma, int) ATTRIBUTE_UNUSED;
static void print_keyword
  (CGEN_CPU_DESC, void *, CGEN_KEYWORD *, long, unsigned int) ATTRIBUTE_UNUSED;
static void print_insn_normal
  (CGEN_CPU_DESC, void *, const CGEN_INSN *, CGEN_FIELDS *, bfd_vma, int);
static int print_insn
  (CGEN_CPU_DESC, bfd_vma,  disassemble_info *, bfd_byte *, unsigned);
static int default_print_insn
  (CGEN_CPU_DESC, bfd_vma, disassemble_info *) ATTRIBUTE_UNUSED;
static int read_insn
  (CGEN_CPU_DESC, bfd_vma, disassemble_info *, bfd_byte *, int, CGEN_EXTRACT_INFO *,
   unsigned long *);

/* -- disassembler routines inserted here.  */

/* -- dis.c */
char limm_str[11] = "0x";

/* Read a long immediate and write it hexadecimally into limm_str.  */
static void
read_limm (CGEN_EXTRACT_INFO *ex_info, bfd_vma pc)
{
  char buf[2];
  int i;
  char *limmp = limm_str + 2;
  disassemble_info *dis_info = (disassemble_info *) ex_info->dis_info;

  for (i = 0; i < 2; i++, limmp +=4, pc += 2)
    {
      int status = (*dis_info->read_memory_func) (pc, (unsigned char*)buf, 2, dis_info);

      if (status != 0)
        (*dis_info->memory_error_func) (status, pc, dis_info);
      sprintf (limmp, "%.4x",
	       (unsigned) bfd_get_bits (buf, 16,
					dis_info->endian == BFD_ENDIAN_BIG));
    }
}

/* Return the actual instruction length, in bits, which depends on the size
   of the opcode - 2 or 4 bytes - and the absence or presence of a (4 byte)
   long immediate.
   Also, if a long immediate is present, put its hexadecimal representation
   into limm_str.
   ??? cgen-opc.c:cgen_lookup_insn has a 'sanity' check of the length
   that will fail if its input length differs from the result of
   CGEN_EXTRACT_FN.  Need to check when this could trigger.  */
int
arc_insn_length (unsigned long insn_value, const CGEN_INSN *insn,
		 CGEN_EXTRACT_INFO *info, bfd_vma pc)
{
  switch (CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_LIMM))
    {
    case LIMM_NONE:
      return CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_SHORT_P) ? 16 : 32;
    case LIMM_H:
      {
	/* This is a short insn; extract the actual opcode.  */
	unsigned high = insn_value >> 16;

        if ((high & 0xe7) != 0xc7)
	  return 16;
	read_limm (info, pc+2);
	return 48;
      }
    case LIMM_B:
      if ((insn_value & 0x07007000) != 0x06007000)
	return 32;
      break;
    case LIMM_BC:
      if ((insn_value & 0x07007000) == 0x06007000)
	break;
      /* Fall through.  */
    case LIMM_C:
      if ((insn_value & 0x00000fc0) != 0x00000f80)
	return 32;
      break;
    default:
      abort ();
    }
  read_limm (info, pc+4);
  return 64;
}

/* -- */

void arc_cgen_print_operand
  (CGEN_CPU_DESC, int, PTR, CGEN_FIELDS *, void const *, bfd_vma, int);

/* Main entry point for printing operands.
   XINFO is a `void *' and not a `disassemble_info *' to not put a requirement
   of dis-asm.h on cgen.h.

   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.  */

void
arc_cgen_print_operand (CGEN_CPU_DESC cd,
			   int opindex,
			   void * xinfo,
			   CGEN_FIELDS *fields,
			   void const *attrs ATTRIBUTE_UNUSED,
			   bfd_vma pc,
			   int length)
{
  disassemble_info *info = (disassemble_info *) xinfo;

  switch (opindex)
    {
    case ARC_OPERAND_EXDI :
      print_keyword (cd, info, & arc_cgen_opval_h_Di, fields->f_F, 0);
      break;
    case ARC_OPERAND_F :
      print_keyword (cd, info, & arc_cgen_opval_h_uflags, fields->f_F, 0);
      break;
    case ARC_OPERAND_F0 :
      print_keyword (cd, info, & arc_cgen_opval_h_nil, fields->f_F, 0);
      break;
    case ARC_OPERAND_F1 :
      print_keyword (cd, info, & arc_cgen_opval_h_auflags, fields->f_F, 0);
      break;
    case ARC_OPERAND_F1F :
      print_keyword (cd, info, & arc_cgen_opval_h_aufflags, fields->f_F, 0);
      break;
    case ARC_OPERAND_GP :
      print_keyword (cd, info, & arc_cgen_opval_h_gp, 0, 0);
      break;
    case ARC_OPERAND_LDODI :
      print_keyword (cd, info, & arc_cgen_opval_h_Di, fields->f_LDODi, 0);
      break;
    case ARC_OPERAND_LDRDI :
      print_keyword (cd, info, & arc_cgen_opval_h_Di, fields->f_LDRDi, 0);
      break;
    case ARC_OPERAND_NE :
      print_keyword (cd, info, & arc_cgen_opval_h_ne, 0, 0);
      break;
    case ARC_OPERAND_PCL :
      print_keyword (cd, info, & arc_cgen_opval_h_pcl, 0, 0);
      break;
    case ARC_OPERAND_QCONDB :
      print_keyword (cd, info, & arc_cgen_opval_h_Qcondb, fields->f_cond_Q, 0);
      break;
    case ARC_OPERAND_QCONDI :
      print_keyword (cd, info, & arc_cgen_opval_h_Qcondi, fields->f_cond_Q, 0);
      break;
    case ARC_OPERAND_QCONDJ :
      print_keyword (cd, info, & arc_cgen_opval_h_Qcondj, fields->f_cond_Q, 0);
      break;
    case ARC_OPERAND_R0 :
      print_keyword (cd, info, & arc_cgen_opval_h_r0, 0, 0);
      break;
    case ARC_OPERAND_R31 :
      print_keyword (cd, info, & arc_cgen_opval_h_r31, 0, 0);
      break;
    case ARC_OPERAND_RA :
      print_keyword (cd, info, & arc_cgen_opval_cr_names, fields->f_op_A, 0);
      break;
    case ARC_OPERAND_RA_0 :
      print_keyword (cd, info, & arc_cgen_opval_h_nil, fields->f_op_A, 0);
      break;
    case ARC_OPERAND_RB :
      print_keyword (cd, info, & arc_cgen_opval_cr_names, fields->f_op_B, 0|(1<<CGEN_OPERAND_VIRTUAL));
      break;
    case ARC_OPERAND_RB_0 :
      print_keyword (cd, info, & arc_cgen_opval_h_nil, fields->f_op_B, 0|(1<<CGEN_OPERAND_VIRTUAL));
      break;
    case ARC_OPERAND_RC :
      print_keyword (cd, info, & arc_cgen_opval_cr_names, fields->f_op_C, 0);
      break;
    case ARC_OPERAND_RC_ILINK :
      print_keyword (cd, info, & arc_cgen_opval_h_ilinkx, fields->f_op_Cj, 0);
      break;
    case ARC_OPERAND_RC_NOILINK :
      print_keyword (cd, info, & arc_cgen_opval_h_noilink, fields->f_op_Cj, 0);
      break;
    case ARC_OPERAND_R_A :
      print_keyword (cd, info, & arc_cgen_opval_h_cr16, fields->f_op__a, 0);
      break;
    case ARC_OPERAND_R_B :
      print_keyword (cd, info, & arc_cgen_opval_h_cr16, fields->f_op__b, 0);
      break;
    case ARC_OPERAND_R_C :
      print_keyword (cd, info, & arc_cgen_opval_h_cr16, fields->f_op__c, 0);
      break;
    case ARC_OPERAND_RCC :
      print_keyword (cd, info, & arc_cgen_opval_h_Rcc, fields->f_brcond, 0);
      break;
    case ARC_OPERAND_RCCS :
      print_keyword (cd, info, & arc_cgen_opval_h_RccS, fields->f_brscond, 0);
      break;
    case ARC_OPERAND_RH :
      print_keyword (cd, info, & arc_cgen_opval_cr_names, fields->f_op_h, 0|(1<<CGEN_OPERAND_VIRTUAL));
      break;
    case ARC_OPERAND_SP :
      print_keyword (cd, info, & arc_cgen_opval_h_sp, 0, 0);
      break;
    case ARC_OPERAND_STODI :
      print_keyword (cd, info, & arc_cgen_opval_h_Di, fields->f_STODi, 0);
      break;
    case ARC_OPERAND_U6 :
      print_normal (cd, info, fields->f_u6, 0, pc, length);
      break;
    case ARC_OPERAND_U6X2 :
      print_normal (cd, info, fields->f_u6x2, 0, pc, length);
      break;
    case ARC_OPERAND__AW :
      print_keyword (cd, info, & arc_cgen_opval_h__aw, 0, 0);
      break;
    case ARC_OPERAND__L :
      print_keyword (cd, info, & arc_cgen_opval_h_insn32, 0, 0);
      break;
    case ARC_OPERAND__S :
      print_keyword (cd, info, & arc_cgen_opval_h_insn16, 0, 0);
      break;
    case ARC_OPERAND_CBIT :
      print_normal (cd, info, 0, 0, pc, length);
      break;
    case ARC_OPERAND_DELAY_N :
      print_keyword (cd, info, & arc_cgen_opval_h_delay, fields->f_delay_N, 0);
      break;
    case ARC_OPERAND_DUMMY_OP :
      print_normal (cd, info, fields->f_dummy, 0, pc, length);
      break;
    case ARC_OPERAND_I2COND :
      print_keyword (cd, info, & arc_cgen_opval_h_i2cond, fields->f_cond_i2, 0);
      break;
    case ARC_OPERAND_I3COND :
      print_keyword (cd, info, & arc_cgen_opval_h_i3cond, fields->f_cond_i3, 0);
      break;
    case ARC_OPERAND_LABEL10 :
      print_address (cd, info, fields->f_rel10, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
      break;
    case ARC_OPERAND_LABEL13A :
      print_address (cd, info, fields->f_rel13bl, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
      break;
    case ARC_OPERAND_LABEL21 :
      print_address (cd, info, fields->f_rel21, 0|(1<<CGEN_OPERAND_PCREL_ADDR)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
      break;
    case ARC_OPERAND_LABEL21A :
      print_address (cd, info, fields->f_rel21bl, 0|(1<<CGEN_OPERAND_PCREL_ADDR)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
      break;
    case ARC_OPERAND_LABEL25 :
      print_address (cd, info, fields->f_rel25, 0|(1<<CGEN_OPERAND_PCREL_ADDR)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
      break;
    case ARC_OPERAND_LABEL25A :
      print_address (cd, info, fields->f_rel25bl, 0|(1<<CGEN_OPERAND_PCREL_ADDR)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
      break;
    case ARC_OPERAND_LABEL7 :
      print_address (cd, info, fields->f_rel7, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
      break;
    case ARC_OPERAND_LABEL8 :
      print_address (cd, info, fields->f_rel8, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);
      break;
    case ARC_OPERAND_LABEL9 :
      print_address (cd, info, fields->f_rel9, 0|(1<<CGEN_OPERAND_PCREL_ADDR)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
      break;
    case ARC_OPERAND_LBIT :
      print_normal (cd, info, 0, 0, pc, length);
      break;
    case ARC_OPERAND_NBIT :
      print_normal (cd, info, 0, 0, pc, length);
      break;
    case ARC_OPERAND_S12 :
      print_normal (cd, info, fields->f_s12, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
      break;
    case ARC_OPERAND_S12X2 :
      print_normal (cd, info, fields->f_s12x2, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
      break;
    case ARC_OPERAND_S1BIT :
      print_normal (cd, info, 0, 0, pc, length);
      break;
    case ARC_OPERAND_S2BIT :
      print_normal (cd, info, 0, 0, pc, length);
      break;
    case ARC_OPERAND_S9 :
      print_normal (cd, info, fields->f_s9, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);
      break;
    case ARC_OPERAND_S9X4 :
      print_normal (cd, info, fields->f_s9x4, 0, pc, length);
      break;
    case ARC_OPERAND_SC_S9_ :
      print_normal (cd, info, fields->f_s9x4, 0, pc, length);
      break;
    case ARC_OPERAND_SC_S9B :
      print_normal (cd, info, fields->f_s9x1, 0, pc, length);
      break;
    case ARC_OPERAND_SC_S9W :
      print_normal (cd, info, fields->f_s9x2, 0, pc, length);
      break;
    case ARC_OPERAND_SC_U5_ :
      print_normal (cd, info, fields->f_u5x4, 0, pc, length);
      break;
    case ARC_OPERAND_SC_U5B :
      print_normal (cd, info, fields->f_u5, 0, pc, length);
      break;
    case ARC_OPERAND_SC_U5W :
      print_normal (cd, info, fields->f_u5x2, 0, pc, length);
      break;
    case ARC_OPERAND_TRAPNUM :
      print_normal (cd, info, fields->f_trapnum, 0, pc, length);
      break;
    case ARC_OPERAND_U3 :
      print_normal (cd, info, fields->f_u3, 0, pc, length);
      break;
    case ARC_OPERAND_U5 :
      print_normal (cd, info, fields->f_u5, 0, pc, length);
      break;
    case ARC_OPERAND_U5X4 :
      print_normal (cd, info, fields->f_u5x4, 0, pc, length);
      break;
    case ARC_OPERAND_U7 :
      print_normal (cd, info, fields->f_u7, 0, pc, length);
      break;
    case ARC_OPERAND_U8 :
      print_normal (cd, info, fields->f_u8, 0, pc, length);
      break;
    case ARC_OPERAND_U8X4 :
      print_normal (cd, info, fields->f_u8x4, 0, pc, length);
      break;
    case ARC_OPERAND_UNCONDB :
      print_keyword (cd, info, & arc_cgen_opval_h_uncondb, 0, 0);
      break;
    case ARC_OPERAND_UNCONDI :
      print_keyword (cd, info, & arc_cgen_opval_h_uncondi, 0, 0);
      break;
    case ARC_OPERAND_UNCONDJ :
      print_keyword (cd, info, & arc_cgen_opval_h_uncondj, 0, 0);
      break;
    case ARC_OPERAND_VBIT :
      print_normal (cd, info, 0, 0, pc, length);
      break;
    case ARC_OPERAND_ZBIT :
      print_normal (cd, info, 0, 0, pc, length);
      break;

    default :
      /* xgettext:c-format */
      fprintf (stderr, _("Unrecognized field %d while printing insn.\n"),
	       opindex);
    abort ();
  }
}

cgen_print_fn * const arc_cgen_print_handlers[] =
{
  print_insn_normal,
};


void
arc_cgen_init_dis (CGEN_CPU_DESC cd)
{
  arc_cgen_init_opcode_table (cd);
  arc_cgen_init_ibld_table (cd);
  cd->print_handlers = & arc_cgen_print_handlers[0];
  cd->print_operand = arc_cgen_print_operand;
}


/* Default print handler.  */

static void
print_normal (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
	      void *dis_info,
	      long value,
	      unsigned int attrs,
	      bfd_vma pc ATTRIBUTE_UNUSED,
	      int length ATTRIBUTE_UNUSED)
{
  disassemble_info *info = (disassemble_info *) dis_info;

#ifdef CGEN_PRINT_NORMAL
  CGEN_PRINT_NORMAL (cd, info, value, attrs, pc, length);
#endif

  /* Print the operand as directed by the attributes.  */
  if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
    ; /* nothing to do */
  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
    (*info->fprintf_func) (info->stream, "%ld", value);
  else
    (*info->fprintf_func) (info->stream, "0x%lx", value);
}

/* Default address handler.  */

static void
print_address (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
	       void *dis_info,
	       bfd_vma value,
	       unsigned int attrs,
	       bfd_vma pc ATTRIBUTE_UNUSED,
	       int length ATTRIBUTE_UNUSED)
{
  disassemble_info *info = (disassemble_info *) dis_info;

#ifdef CGEN_PRINT_ADDRESS
  CGEN_PRINT_ADDRESS (cd, info, value, attrs, pc, length);
#endif

  /* Print the operand as directed by the attributes.  */
  if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SEM_ONLY))
    ; /* Nothing to do.  */
  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_PCREL_ADDR))
    (*info->print_address_func) (value, info);
  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_ABS_ADDR))
    (*info->print_address_func) (value, info);
  else if (CGEN_BOOL_ATTR (attrs, CGEN_OPERAND_SIGNED))
    (*info->fprintf_func) (info->stream, "%ld", (long) value);
  else
    (*info->fprintf_func) (info->stream, "0x%lx", (long) value);
}

/* Keyword print handler.  */

static void
print_keyword (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
	       void *dis_info,
	       CGEN_KEYWORD *keyword_table,
	       long value,
	       unsigned int attrs ATTRIBUTE_UNUSED)
{
  disassemble_info *info = (disassemble_info *) dis_info;
  const CGEN_KEYWORD_ENTRY *ke;

  ke = cgen_keyword_lookup_value (keyword_table, value);
  if (ke != NULL)
    (*info->fprintf_func) (info->stream, "%s", ke->name);
  else
    (*info->fprintf_func) (info->stream, "???");
}

/* Default insn printer.

   DIS_INFO is defined as `void *' so the disassembler needn't know anything
   about disassemble_info.  */

static void
print_insn_normal (CGEN_CPU_DESC cd,
		   void *dis_info,
		   const CGEN_INSN *insn,
		   CGEN_FIELDS *fields,
		   bfd_vma pc,
		   int length)
{
  const CGEN_SYNTAX *syntax = CGEN_INSN_SYNTAX (insn);
  disassemble_info *info = (disassemble_info *) dis_info;
  const CGEN_SYNTAX_CHAR_TYPE *syn;

  CGEN_INIT_PRINT (cd);

  for (syn = CGEN_SYNTAX_STRING (syntax); *syn; ++syn)
    {
      if (CGEN_SYNTAX_MNEMONIC_P (*syn))
	{
	  (*info->fprintf_func) (info->stream, "%s", CGEN_INSN_MNEMONIC (insn));
	  continue;
	}
      if (CGEN_SYNTAX_CHAR_P (*syn))
	{
	  (*info->fprintf_func) (info->stream, "%c", CGEN_SYNTAX_CHAR (*syn));
	  continue;
	}

      /* We have an operand.  */
      arc_cgen_print_operand (cd, CGEN_SYNTAX_FIELD (*syn), info,
				 fields, CGEN_INSN_ATTRS (insn), pc, length);
    }
}

/* Subroutine of print_insn. Reads an insn into the given buffers and updates
   the extract info.
   Returns 0 if all is well, non-zero otherwise.  */

static int
read_insn (CGEN_CPU_DESC cd ATTRIBUTE_UNUSED,
	   bfd_vma pc,
	   disassemble_info *info,
	   bfd_byte *buf,
	   int buflen,
	   CGEN_EXTRACT_INFO *ex_info,
	   unsigned long *insn_value)
{
  int status = (*info->read_memory_func) (pc, buf, buflen, info);

  if (status != 0)
    {
      (*info->memory_error_func) (status, pc, info);
      return -1;
    }

  ex_info->dis_info = info;
  ex_info->valid = (1 << buflen) - 1;
  ex_info->insn_bytes = buf;

  *insn_value = bfd_get_bits (buf, buflen * 8, info->endian == BFD_ENDIAN_BIG);
  return 0;
}

/* Utility to print an insn.
   BUF is the base part of the insn, target byte order, BUFLEN bytes long.
   The result is the size of the insn in bytes or zero for an unknown insn
   or -1 if an error occurs fetching data (memory_error_func will have
   been called).  */

static int
print_insn (CGEN_CPU_DESC cd,
	    bfd_vma pc,
	    disassemble_info *info,
	    bfd_byte *buf,
	    unsigned int buflen)
{
  CGEN_INSN_INT insn_value;
  const CGEN_INSN_LIST *insn_list;
  CGEN_EXTRACT_INFO ex_info;
  int basesize;

  /* Extract base part of instruction, just in case CGEN_DIS_* uses it. */
  basesize = cd->base_insn_bitsize < buflen * 8 ?
                                     cd->base_insn_bitsize : buflen * 8;
  insn_value = cgen_get_insn_value (cd, buf, basesize);


  /* Fill in ex_info fields like read_insn would.  Don't actually call
     read_insn, since the incoming buffer is already read (and possibly
     modified a la m32r).  */
  ex_info.valid = (1 << buflen) - 1;
  ex_info.dis_info = info;
  ex_info.insn_bytes = buf;

  /* The instructions are stored in hash lists.
     Pick the first one and keep trying until we find the right one.  */

  insn_list = CGEN_DIS_LOOKUP_INSN (cd, (char *) buf, insn_value);
  while (insn_list != NULL)
    {
      const CGEN_INSN *insn = insn_list->insn;
      CGEN_FIELDS fields;
      int length;
      unsigned long insn_value_cropped;

#ifdef CGEN_VALIDATE_INSN_SUPPORTED
      /* Not needed as insn shouldn't be in hash lists if not supported.  */
      /* Supported by this cpu?  */
      if (! arc_cgen_insn_supported (cd, insn))
        {
          insn_list = CGEN_DIS_NEXT_INSN (insn_list);
	  continue;
        }
#endif

      /* Basic bit mask must be correct.  */
      /* ??? May wish to allow target to defer this check until the extract
	 handler.  */

      /* Base size may exceed this instruction's size.  Extract the
         relevant part from the buffer. */
      if ((unsigned) (CGEN_INSN_BITSIZE (insn) / 8) < buflen &&
	  (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
	insn_value_cropped = bfd_get_bits (buf, CGEN_INSN_BITSIZE (insn),
					   info->endian == BFD_ENDIAN_BIG);
      else
	insn_value_cropped = insn_value;

      if ((insn_value_cropped & CGEN_INSN_BASE_MASK (insn))
	  == CGEN_INSN_BASE_VALUE (insn))
	{
	  /* Printing is handled in two passes.  The first pass parses the
	     machine insn and extracts the fields.  The second pass prints
	     them.  */

	  /* Make sure the entire insn is loaded into insn_value, if it
	     can fit.  */
	  if (((unsigned) CGEN_INSN_BITSIZE (insn) > cd->base_insn_bitsize) &&
	      (unsigned) (CGEN_INSN_BITSIZE (insn) / 8) <= sizeof (unsigned long))
	    {
	      unsigned long full_insn_value;
	      int rc = read_insn (cd, pc, info, buf,
				  CGEN_INSN_BITSIZE (insn) / 8,
				  & ex_info, & full_insn_value);
	      if (rc != 0)
		return rc;
	      length = CGEN_EXTRACT_FN (cd, insn)
		(cd, insn, &ex_info, full_insn_value, &fields, pc);
	    }
	  else
	    length = CGEN_EXTRACT_FN (cd, insn)
	      (cd, insn, &ex_info, insn_value_cropped, &fields, pc);

	  /* Length < 0 -> error.  */
	  if (length < 0)
	    return length;
	  if (length > 0)
	    {
	      CGEN_PRINT_FN (cd, insn) (cd, info, insn, &fields, pc, length);
	      /* Length is in bits, result is in bytes.  */
	      return length / 8;
	    }
	}

      insn_list = CGEN_DIS_NEXT_INSN (insn_list);
    }

  return 0;
}

/* Default value for CGEN_PRINT_INSN.
   The result is the size of the insn in bytes or zero for an unknown insn
   or -1 if an error occured fetching bytes.  */

#ifndef CGEN_PRINT_INSN
#define CGEN_PRINT_INSN default_print_insn
#endif

static int
default_print_insn (CGEN_CPU_DESC cd, bfd_vma pc, disassemble_info *info)
{
  bfd_byte buf[CGEN_MAX_INSN_SIZE];
  int buflen;
  int status;

  /* Attempt to read the base part of the insn.  */
  buflen = cd->base_insn_bitsize / 8;
  status = (*info->read_memory_func) (pc, buf, buflen, info);

  /* Try again with the minimum part, if min < base.  */
  if (status != 0 && (cd->min_insn_bitsize < cd->base_insn_bitsize))
    {
      buflen = cd->min_insn_bitsize / 8;
      status = (*info->read_memory_func) (pc, buf, buflen, info);
    }

  if (status != 0)
    {
      (*info->memory_error_func) (status, pc, info);
      return -1;
    }

  return print_insn (cd, pc, info, buf, buflen);
}

/* Main entry point.
   Print one instruction from PC on INFO->STREAM.
   Return the size of the instruction (in bytes).  */

typedef struct cpu_desc_list
{
  struct cpu_desc_list *next;
  CGEN_BITSET *isa;
  int mach;
  int endian;
  CGEN_CPU_DESC cd;
} cpu_desc_list;

int
print_insn_arc (bfd_vma pc, disassemble_info *info)
{
  static cpu_desc_list *cd_list = 0;
  cpu_desc_list *cl = 0;
  static CGEN_CPU_DESC cd = 0;
  static CGEN_BITSET *prev_isa;
  static int prev_mach;
  static int prev_endian;
  int length;
  CGEN_BITSET *isa;
  int mach;
  int endian = (info->endian == BFD_ENDIAN_BIG
		? CGEN_ENDIAN_BIG
		: CGEN_ENDIAN_LITTLE);
  enum bfd_architecture arch;

  /* ??? gdb will set mach but leave the architecture as "unknown" */
#ifndef CGEN_BFD_ARCH
#define CGEN_BFD_ARCH bfd_arch_arc
#endif
  arch = info->arch;
  if (arch == bfd_arch_unknown)
    arch = CGEN_BFD_ARCH;

  /* There's no standard way to compute the machine or isa number
     so we leave it to the target.  */
#ifdef CGEN_COMPUTE_MACH
  mach = CGEN_COMPUTE_MACH (info);
#else
  mach = info->mach;
#endif

#ifdef CGEN_COMPUTE_ISA
  {
    static CGEN_BITSET *permanent_isa;

    if (!permanent_isa)
      permanent_isa = cgen_bitset_create (MAX_ISAS);
    isa = permanent_isa;
    cgen_bitset_clear (isa);
    cgen_bitset_add (isa, CGEN_COMPUTE_ISA (info));
  }
#else
  isa = info->insn_sets;
#endif

  /* If we've switched cpu's, try to find a handle we've used before */
  if (cd
      && (cgen_bitset_compare (isa, prev_isa) != 0
	  || mach != prev_mach
	  || endian != prev_endian))
    {
      cd = 0;
      for (cl = cd_list; cl; cl = cl->next)
	{
	  if (cgen_bitset_compare (cl->isa, isa) == 0 &&
	      cl->mach == mach &&
	      cl->endian == endian)
	    {
	      cd = cl->cd;
 	      prev_isa = cd->isas;
	      break;
	    }
	}
    }

  /* If we haven't initialized yet, initialize the opcode table.  */
  if (! cd)
    {
      const bfd_arch_info_type *arch_type = bfd_lookup_arch (arch, mach);
      const char *mach_name;

      if (!arch_type)
	abort ();
      mach_name = arch_type->printable_name;

      prev_isa = cgen_bitset_copy (isa);
      prev_mach = mach;
      prev_endian = endian;
      cd = arc_cgen_cpu_open (CGEN_CPU_OPEN_ISAS, prev_isa,
				 CGEN_CPU_OPEN_BFDMACH, mach_name,
				 CGEN_CPU_OPEN_ENDIAN, prev_endian,
				 CGEN_CPU_OPEN_END);
      if (!cd)
	abort ();

      /* Save this away for future reference.  */
      cl = xmalloc (sizeof (struct cpu_desc_list));
      cl->cd = cd;
      cl->isa = prev_isa;
      cl->mach = mach;
      cl->endian = endian;
      cl->next = cd_list;
      cd_list = cl;

      arc_cgen_init_dis (cd);
    }

  /* We try to have as much common code as possible.
     But at this point some targets need to take over.  */
  /* ??? Some targets may need a hook elsewhere.  Try to avoid this,
     but if not possible try to move this hook elsewhere rather than
     have two hooks.  */
  length = CGEN_PRINT_INSN (cd, pc, info);
  if (length > 0)
    return length;
  if (length < 0)
    return -1;

  (*info->fprintf_func) (info->stream, UNKNOWN_INSN_MSG);
  return cd->default_insn_bitsize / 8;
}