regs.c

体系机构仿真

/*
 * regs.c - architected registers state routines
 *
 * This file is an adaptation of the software in the SimpleScalar tool suite
 * originally written by Todd M. Austin for the Multiscalar Research Project
 * at the University of Wisconsin-Madison.
 *
 * The modifications were made by Naraig Manjikian at Queen's University,
 * Kingston, Ontario, Canada.
 *
 * The remainder of this header comment is unchanged from the original text.
 *
 *..........................................................................
 * 
 * Copyright (C) 1994, 1995, 1996, 1997 by Todd M. Austin
 *
 * This source file is distributed "as is" in the hope that it will be
 * useful.  The tool set comes with no warranty, and no author or
 * distributor accepts any responsibility for the consequences of its
 * use. 
 * 
 * Everyone is granted permission to copy, modify and redistribute
 * this tool set under the following conditions:
 * 
 *    This source code is distributed for non-commercial use only. 
 *    Please contact the maintainer for restrictions applying to 
 *    commercial use.
 *
 *    Permission is granted to anyone to make or distribute copies
 *    of this source code, either as received or modified, in any
 *    medium, provided that all copyright notices, permission and
 *    nonwarranty notices are preserved, and that the distributor
 *    grants the recipient permission for further redistribution as
 *    permitted by this document.
 *
 *    Permission is granted to distribute this file in compiled
 *    or executable form under the same conditions that apply for
 *    source code, provided that either:
 *
 *    A. it is accompanied by the corresponding machine-readable
 *       source code,
 *    B. it is accompanied by a written offer, with no time limit,
 *       to give anyone a machine-readable copy of the corresponding
 *       source code in return for reimbursement of the cost of
 *       distribution.  This written offer must permit verbatim
 *       duplication by anyone, or
 *    C. it is distributed by someone who received only the
 *       executable form, and is accompanied by a copy of the
 *       written offer of source code that they received concurrently.
 *
 * In other words, you are welcome to use, share and improve this
 * source file.  You are forbidden to forbid anyone else to use, share
 * and improve what you give them.
 *
 * INTERNET: [e-mail]
 * US Mail:  1210 W. Dayton Street, Madison, WI 53706
 *
 * $Id: regs.c,v 1.4 1997/03/11 01:19:28 taustin Exp taustin $
 *
 * $Log: regs.c,v $
 * Revision 1.4  1997/03/11  01:19:28  taustin
 * updated copyright
 * long/int tweaks made for ALPHA target support
 *
 * Revision 1.3  1997/01/06  16:02:36  taustin
 * comments updated
 *
 * Revision 1.1  1996/12/05  18:52:32  taustin
 * Initial revision
 *
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "misc.h"
#include "ss.h"
#include "loader.h"
#include "regs.h"

/* (signed) integer register file */
SS_WORD_TYPE regs_R[MAX_PROCS][SS_NUM_REGS];

/* floating point register file */
union regs_FP regs_F[MAX_PROCS];

/* (signed) hi register, holds mult/div results */
SS_WORD_TYPE regs_HI[MAX_PROCS];
/* (signed) lo register, holds mult/div results */
SS_WORD_TYPE regs_LO[MAX_PROCS];

/* floating point condition codes */
int regs_FCC[MAX_PROCS];

/* program counter */
SS_ADDR_TYPE regs_PC[MAX_PROCS];

/* initialize architected register state */
void
regs_init(int pid, SS_ADDR_TYPE init_stack_ptr, SS_ADDR_TYPE entry_ptr)
{
  int i;

  for (i=0; i<SS_NUM_REGS; i++)
    regs_F[pid].l[i] = regs_R[pid][i] = 0;
  regs_HI[pid] = 0;
  regs_LO[pid] = 0;
  regs_FCC[pid] = 0;
  regs_PC[pid] = 0;

  /* set up initial register state (pid determines how to set) */
  if (pid == 0)
  {
    regs_R[pid][SS_STACK_REGNO] = ld_environ_base;
    regs_PC[pid] = ld_prog_entry;
  }
  else
  {
    regs_R[pid][SS_STACK_REGNO] = init_stack_ptr;
    regs_PC[pid] = entry_ptr;
    /* get current value of global pointer */
    regs_R[pid][SS_GP_REGNO] = regs_R[0][SS_GP_REGNO];
  }
}

/* dump all architected register state values to output stream STREAM */
void
regs_dump(FILE *stream, int pid)		/* output stream */
{
  int i;

  /* stderr is the default output stream */
  if (!stream)
    stream = stderr;

  /* dump processor register state */
  fprintf(stream, "Processor state:\n");
  fprintf(stream, "    PC: 0x%08x\n", regs_PC[pid]);
  for (i=0; i<SS_NUM_REGS; i += 2)
    {
      fprintf(stream, "    R[%2d]: %12d/0x%08x",
	      i, regs_R[pid][i], regs_R[pid][i]);
      fprintf(stream, "  R[%2d]: %12d/0x%08x\n",
	      i+1, regs_R[pid][i+1], regs_R[pid][i+1]);
    }
  fprintf(stream, "    HI:      %10d/0x%08x  LO:      %10d/0x%08x\n",
	  regs_HI[pid], regs_HI[pid], regs_LO[pid], regs_LO[pid]);
  for (i=0; i<SS_NUM_REGS; i += 2)
    {
      fprintf(stream, "    F[%2d]: %12d/0x%08x",
	      i, regs_F[pid].l[i], regs_F[pid].l[i]);
      fprintf(stream, "  F[%2d]: %12d/0x%08x\n",
	      i+1, regs_F[pid].l[i+1], regs_F[pid].l[i+1]);
    }
  fprintf(stream, "    FCC:                0x%08x\n", regs_FCC[pid]);
}