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/* ARC target-dependent stuff. Extension structure access functions

   Copyright 1995, 1997, 2000, 2001, 2004, 2005, 2007, 2009

   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.  */

#include "sysdep.h"

#include <stdlib.h>

#include <stdio.h>

#include "bfd.h"

#include "arc-ext.h"

#include "libiberty.h"

/* Extension structure  */

static struct arcExtMap arc_extension_map;

/* Get the name of an extension instruction.  */

const char *

arcExtMap_instName(int opcode, int minor, int *flags)

{

    if (opcode == 3)

      {

        /* FIXME: ??? need to also check 0/1/2 in bit0 for (3f) brk/sleep/swi  */

        if (minor < 0x09 || minor == 0x3f)

          return 0;

        else

          opcode = 0x1f - 0x10 + minor - 0x09 + 1;

      }

    else

      if (opcode < 0x10)

        return 0;

    else

      opcode -= 0x10;

    if (!arc_extension_map.instructions[opcode])

      return 0;

    *flags = arc_extension_map.instructions[opcode]->flags;

    return arc_extension_map.instructions[opcode]->name;

}

/* Get the name of an extension core register.  */

const char *

arcExtMap_coreRegName(int value)

{

  if (value < 32)

    return 0;

  return arc_extension_map.coreRegisters[value-32];

}

/* Get the name of an extension condition code.  */

const char *

arcExtMap_condCodeName(int value)

{

  if (value < 16)

    return 0;

  return arc_extension_map.condCodes[value-16];

}

/* Get the name of an extension aux register.  */

const char *

arcExtMap_auxRegName(long address)

{

  /* walk the list of aux reg names and find the name  */

  struct ExtAuxRegister *r;

  for (r = arc_extension_map.auxRegisters; r; r = r->next) {

    if (r->address == address)

      return (const char *) r->name;

  }

  return 0;

}

/* Recursively free auxilliary register strcture pointers until

   the list is empty.  */

static void

clean_aux_registers(struct ExtAuxRegister *r)

{

  if (r -> next)

    {

      clean_aux_registers( r->next);

      free(r -> name);

      free(r -> next);

      r ->next = NULL;

    }

  else

    free(r -> name);

}

/* Free memory that has been allocated for the extensions.  */

static void

cleanup_ext_map(void)

{

  struct ExtAuxRegister *r;

  struct ExtInstruction *insn;

  int i;

  /* clean aux reg structure  */

  r = arc_extension_map.auxRegisters;

  if (r)

    {

      (clean_aux_registers(r));

      free(r);

    }

  /* clean instructions  */

  for (i = 0; i < NUM_EXT_INST; i++)

    {

      insn = arc_extension_map.instructions[i];

      if (insn)

        free(insn->name);

    }

  /* clean core reg struct  */

  for (i = 0; i < NUM_EXT_CORE; i++)

    {

      if (arc_extension_map.coreRegisters[i])

        free(arc_extension_map.coreRegisters[i]);

    }

  for (i = 0; i < NUM_EXT_COND; i++) {

    if (arc_extension_map.condCodes[i])

      free(arc_extension_map.condCodes[i]);

  }

  memset(&arc_extension_map, 0, sizeof(struct arcExtMap));

}

int

arcExtMap_add(void *base, unsigned long length)

{

  unsigned char *block = (unsigned char *) base;

  unsigned char *p = (unsigned char *) block;

  /* Clean up and reset everything if needed.  */

  cleanup_ext_map();

  while (p && p < (block + length))

    {

      /* p[0] == length of record

         p[1] == type of record

         For instructions:

           p[2]  = opcode

           p[3]  = minor opcode (if opcode == 3)

           p[4]  = flags

           p[5]+ = name

         For core regs and condition codes:

           p[2]  = value

           p[3]+ = name

         For aux regs:

           p[2..5] = value

           p[6]+   = name

         (value is p[2]<<24|p[3]<<16|p[4]<<8|p[5])  */

      if (p[0] == 0)

        return -1;

      switch (p[1])

        {

        case EXT_INSTRUCTION:

          {

            char opcode = p[2];

            char minor  = p[3];

            char * insn_name = (char *) xmalloc(( (int)*p-5) * sizeof(char));

            struct ExtInstruction * insn =

              (struct ExtInstruction *) xmalloc(sizeof(struct ExtInstruction));

            if (opcode==3)

              opcode = 0x1f - 0x10 + minor - 0x09 + 1;

            else

              opcode -= 0x10;

            insn -> flags = (char) *(p+4);

            strcpy (insn_name, (char *) (p+5));

            insn -> name = insn_name;

            arc_extension_map.instructions[(int) opcode] = insn;

          }

          break;

        case EXT_CORE_REGISTER:

          {

            char * core_name = (char *) xmalloc(((int)*p-3) * sizeof(char));

            strcpy(core_name, (char *) (p+3));

            arc_extension_map.coreRegisters[p[2]-32] = core_name;

          }

          break;

        case EXT_COND_CODE:

          {

            char * cc_name = (char *) xmalloc( ((int)*p-3) * sizeof(char));

            strcpy(cc_name, (char *) (p+3));

            arc_extension_map.condCodes[p[2]-16] = cc_name;

          }

          break;

        case EXT_AUX_REGISTER:

          {

            /* trickier -- need to store linked list to these  */

            struct ExtAuxRegister *newAuxRegister =

              (struct ExtAuxRegister *)malloc(sizeof(struct ExtAuxRegister));

            char * aux_name = (char *) xmalloc ( ((int)*p-6) * sizeof(char));

            strcpy (aux_name, (char *) (p+6));

            newAuxRegister->name = aux_name;

            newAuxRegister->address = p[2]<<24 | p[3]<<16 | p[4]<<8  | p[5];

            newAuxRegister->next = arc_extension_map.auxRegisters;

            arc_extension_map.auxRegisters = newAuxRegister;

          }

          break;

        default:

          return -1;

        }

      p += p[0]; /* move to next record  */

    }

  return 0;

}

/* Load hw extension descibed in .extArcMap ELF section.  */

void

build_ARC_extmap (text_bfd)

  bfd *text_bfd;

{

  char *arcExtMap;

  bfd_size_type count;

  asection *p;

  for (p = text_bfd->sections; p != NULL; p = p->next)

    if (!strcmp (p->name, ".arcextmap"))

      {

        count = bfd_get_section_size (p);

        arcExtMap = (char *) xmalloc (count);

        if (bfd_get_section_contents (text_bfd, p, (PTR) arcExtMap, 0, count))

          {

            arcExtMap_add ((PTR) arcExtMap, count);

            break;

          }

        free ((PTR) arcExtMap);

      }

}