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[/] [open8_urisc/] [trunk/] [gnu/] [binutils/] [opcodes/] [arc-ext.c] - Blame information for rev 18

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1 18 khays
/* ARC target-dependent stuff. Extension structure access functions
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   Copyright 1995, 1997, 2000, 2001, 2004, 2005, 2007, 2009
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   Free Software Foundation, Inc.
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   This file is part of libopcodes.
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   This library is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3, or (at your option)
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   any later version.
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   It is distributed in the hope that it will be useful, but WITHOUT
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   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
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   License for more details.
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   You should have received a copy of the GNU General Public License
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   along with this program; if not, write to the Free Software
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   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
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   MA 02110-1301, USA.  */
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#include "sysdep.h"
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#include <stdlib.h>
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#include <stdio.h>
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#include "bfd.h"
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#include "arc-ext.h"
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#include "libiberty.h"
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/* Extension structure  */
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static struct arcExtMap arc_extension_map;
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/* Get the name of an extension instruction.  */
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const char *
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arcExtMap_instName(int opcode, int minor, int *flags)
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{
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    if (opcode == 3)
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      {
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        /* FIXME: ??? need to also check 0/1/2 in bit0 for (3f) brk/sleep/swi  */
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        if (minor < 0x09 || minor == 0x3f)
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          return 0;
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        else
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          opcode = 0x1f - 0x10 + minor - 0x09 + 1;
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      }
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    else
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      if (opcode < 0x10)
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        return 0;
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    else
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      opcode -= 0x10;
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    if (!arc_extension_map.instructions[opcode])
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      return 0;
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    *flags = arc_extension_map.instructions[opcode]->flags;
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    return arc_extension_map.instructions[opcode]->name;
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}
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/* Get the name of an extension core register.  */
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const char *
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arcExtMap_coreRegName(int value)
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{
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  if (value < 32)
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    return 0;
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  return arc_extension_map.coreRegisters[value-32];
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}
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/* Get the name of an extension condition code.  */
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const char *
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arcExtMap_condCodeName(int value)
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{
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  if (value < 16)
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    return 0;
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  return arc_extension_map.condCodes[value-16];
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}
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/* Get the name of an extension aux register.  */
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const char *
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arcExtMap_auxRegName(long address)
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{
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  /* walk the list of aux reg names and find the name  */
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  struct ExtAuxRegister *r;
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  for (r = arc_extension_map.auxRegisters; r; r = r->next) {
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    if (r->address == address)
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      return (const char *) r->name;
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  }
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  return 0;
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}
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/* Recursively free auxilliary register strcture pointers until
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   the list is empty.  */
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static void
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clean_aux_registers(struct ExtAuxRegister *r)
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{
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  if (r -> next)
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    {
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      clean_aux_registers( r->next);
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      free(r -> name);
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      free(r -> next);
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      r ->next = NULL;
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    }
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  else
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    free(r -> name);
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}
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/* Free memory that has been allocated for the extensions.  */
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static void
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cleanup_ext_map(void)
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{
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  struct ExtAuxRegister *r;
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  struct ExtInstruction *insn;
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  int i;
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  /* clean aux reg structure  */
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  r = arc_extension_map.auxRegisters;
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  if (r)
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    {
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      (clean_aux_registers(r));
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      free(r);
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    }
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  /* clean instructions  */
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  for (i = 0; i < NUM_EXT_INST; i++)
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    {
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      insn = arc_extension_map.instructions[i];
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      if (insn)
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        free(insn->name);
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    }
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  /* clean core reg struct  */
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  for (i = 0; i < NUM_EXT_CORE; i++)
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    {
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      if (arc_extension_map.coreRegisters[i])
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        free(arc_extension_map.coreRegisters[i]);
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    }
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  for (i = 0; i < NUM_EXT_COND; i++) {
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    if (arc_extension_map.condCodes[i])
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      free(arc_extension_map.condCodes[i]);
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  }
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  memset(&arc_extension_map, 0, sizeof(struct arcExtMap));
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}
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int
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arcExtMap_add(void *base, unsigned long length)
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{
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  unsigned char *block = (unsigned char *) base;
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  unsigned char *p = (unsigned char *) block;
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  /* Clean up and reset everything if needed.  */
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  cleanup_ext_map();
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  while (p && p < (block + length))
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    {
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      /* p[0] == length of record
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         p[1] == type of record
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         For instructions:
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           p[2]  = opcode
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           p[3]  = minor opcode (if opcode == 3)
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           p[4]  = flags
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           p[5]+ = name
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         For core regs and condition codes:
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           p[2]  = value
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           p[3]+ = name
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         For aux regs:
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           p[2..5] = value
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           p[6]+   = name
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         (value is p[2]<<24|p[3]<<16|p[4]<<8|p[5])  */
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      if (p[0] == 0)
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        return -1;
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      switch (p[1])
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        {
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        case EXT_INSTRUCTION:
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          {
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            char opcode = p[2];
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            char minor  = p[3];
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            char * insn_name = (char *) xmalloc(( (int)*p-5) * sizeof(char));
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            struct ExtInstruction * insn =
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              (struct ExtInstruction *) xmalloc(sizeof(struct ExtInstruction));
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            if (opcode==3)
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              opcode = 0x1f - 0x10 + minor - 0x09 + 1;
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            else
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              opcode -= 0x10;
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            insn -> flags = (char) *(p+4);
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            strcpy (insn_name, (char *) (p+5));
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            insn -> name = insn_name;
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            arc_extension_map.instructions[(int) opcode] = insn;
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          }
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          break;
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        case EXT_CORE_REGISTER:
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          {
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            char * core_name = (char *) xmalloc(((int)*p-3) * sizeof(char));
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            strcpy(core_name, (char *) (p+3));
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            arc_extension_map.coreRegisters[p[2]-32] = core_name;
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          }
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          break;
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        case EXT_COND_CODE:
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          {
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            char * cc_name = (char *) xmalloc( ((int)*p-3) * sizeof(char));
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            strcpy(cc_name, (char *) (p+3));
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            arc_extension_map.condCodes[p[2]-16] = cc_name;
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          }
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          break;
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        case EXT_AUX_REGISTER:
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          {
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            /* trickier -- need to store linked list to these  */
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            struct ExtAuxRegister *newAuxRegister =
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              (struct ExtAuxRegister *)malloc(sizeof(struct ExtAuxRegister));
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            char * aux_name = (char *) xmalloc ( ((int)*p-6) * sizeof(char));
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            strcpy (aux_name, (char *) (p+6));
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            newAuxRegister->name = aux_name;
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            newAuxRegister->address = p[2]<<24 | p[3]<<16 | p[4]<<8  | p[5];
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            newAuxRegister->next = arc_extension_map.auxRegisters;
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            arc_extension_map.auxRegisters = newAuxRegister;
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          }
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          break;
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        default:
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          return -1;
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233
        }
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      p += p[0]; /* move to next record  */
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    }
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  return 0;
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}
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/* Load hw extension descibed in .extArcMap ELF section.  */
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242
void
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build_ARC_extmap (text_bfd)
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  bfd *text_bfd;
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{
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  char *arcExtMap;
247
  bfd_size_type count;
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  asection *p;
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  for (p = text_bfd->sections; p != NULL; p = p->next)
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    if (!strcmp (p->name, ".arcextmap"))
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      {
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        count = bfd_get_section_size (p);
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        arcExtMap = (char *) xmalloc (count);
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        if (bfd_get_section_contents (text_bfd, p, (PTR) arcExtMap, 0, count))
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          {
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            arcExtMap_add ((PTR) arcExtMap, count);
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            break;
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          }
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        free ((PTR) arcExtMap);
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      }
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}

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