source: trunk/src/binutils/opcodes/arc-ext.c@ 1917

/* ARC target-dependent stuff. Extension structure access functions
   Copyright 1995, 1997, 2000, 2001 Free Software Foundation, Inc.

   This file is part of GDB.

   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.  */

#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 (const char *) 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 (const char *) 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 = base;
  unsigned char *p = block;

  /* Clean up and reset everything if needed.  */
  cleanup_ext_map();

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