Subversion Repositories openrisc_2011-10-31

/* 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, 2007

   Free Software Foundation, Inc.

   This file is part of libopcodes.

   This library 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 3, or (at your option)

   any later version.

   It 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 "openrisc-desc.h"

#include "openrisc-opc.h"

#include "opintl.h"

/* 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.  */

void openrisc_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

openrisc_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 OPENRISC_OPERAND_ABS_26 :

      print_address (cd, info, fields->f_abs26, 0|(1<<CGEN_OPERAND_ABS_ADDR), pc, length);

      break;

    case OPENRISC_OPERAND_DISP_26 :

      print_address (cd, info, fields->f_disp26, 0|(1<<CGEN_OPERAND_PCREL_ADDR), pc, length);

      break;

    case OPENRISC_OPERAND_HI16 :

      print_normal (cd, info, fields->f_simm16, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_SIGN_OPT), pc, length);

      break;

    case OPENRISC_OPERAND_LO16 :

      print_normal (cd, info, fields->f_lo16, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_SIGN_OPT), pc, length);

      break;

    case OPENRISC_OPERAND_OP_F_23 :

      print_normal (cd, info, fields->f_op4, 0, pc, length);

      break;

    case OPENRISC_OPERAND_OP_F_3 :

      print_normal (cd, info, fields->f_op5, 0, pc, length);

      break;

    case OPENRISC_OPERAND_RA :

      print_keyword (cd, info, & openrisc_cgen_opval_h_gr, fields->f_r2, 0);

      break;

    case OPENRISC_OPERAND_RB :

      print_keyword (cd, info, & openrisc_cgen_opval_h_gr, fields->f_r3, 0);

      break;

    case OPENRISC_OPERAND_RD :

      print_keyword (cd, info, & openrisc_cgen_opval_h_gr, fields->f_r1, 0);

      break;

    case OPENRISC_OPERAND_SIMM_16 :

      print_normal (cd, info, fields->f_simm16, 0|(1<<CGEN_OPERAND_SIGNED), pc, length);

      break;

    case OPENRISC_OPERAND_UI16NC :

      print_normal (cd, info, fields->f_i16nc, 0|(1<<CGEN_OPERAND_SIGNED)|(1<<CGEN_OPERAND_SIGN_OPT)|(1<<CGEN_OPERAND_VIRTUAL), pc, length);

      break;

    case OPENRISC_OPERAND_UIMM_16 :

      print_normal (cd, info, fields->f_uimm16, 0, pc, length);

      break;

    case OPENRISC_OPERAND_UIMM_5 :

      print_normal (cd, info, fields->f_uimm5, 0, pc, length);

      break;

    default :

      /* xgettext:c-format */

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

               opindex);

    abort ();

  }

}

cgen_print_fn * const openrisc_cgen_print_handlers[] =

{

  print_insn_normal,

};

void

openrisc_cgen_init_dis (CGEN_CPU_DESC cd)

{

  openrisc_cgen_init_opcode_table (cd);

  openrisc_cgen_init_ibld_table (cd);

  cd->print_handlers = & openrisc_cgen_print_handlers[0];

  cd->print_operand = openrisc_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.  */

      openrisc_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 (! openrisc_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_openrisc (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_openrisc

#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 = openrisc_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;

      openrisc_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;

}