pipeline.c

这个是LINUX下的GDB调度工具的源码

/* frv vliw model.
   Copyright (C) 1999, 2000, 2001, 2003 Free Software Foundation, Inc.
   Contributed by Red Hat.

This file is part of the GNU simulators.

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, 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.  */

#define WANT_CPU frvbf
#define WANT_CPU_FRVBF

#include "sim-main.h"

/* Simulator specific vliw related functions.  Additional vliw related
   code used by both the simulator and the assembler is in frv.opc.  */

int insns_in_slot[UNIT_NUM_UNITS] = {0};

void
frv_vliw_setup_insn (SIM_CPU *current_cpu, const CGEN_INSN *insn)
{
  FRV_VLIW *vliw;
  int index;

  /* Always clear the NE index which indicates the target register
     of a non excepting insn. This will be reset by the insn if
     necessary.  */
  frv_interrupt_state.ne_index = NE_NOFLAG;

  vliw = CPU_VLIW (current_cpu);
  index = vliw->next_slot - 1;
  if (frv_is_float_insn (insn))
    {
      /* If the insn is to be added and is a floating point insn and
	 it is the first floating point insn in the vliw, then clear
	 FSR0.FTT.  */
      int i;
      for (i = 0; i < index; ++i)
	if (frv_is_float_major (vliw->major[i], vliw->mach))
	  break; /* found float insn.  */
      if (i >= index)
	{
	  SI fsr0 = GET_FSR (0);
	  SET_FSR_FTT (fsr0, FTT_NONE);
	  SET_FSR (0, fsr0);
	}
    }
  else if (frv_is_media_insn (insn))
    {
      /* Clear the appropriate MSR fields depending on which slot
	 this insn is in.  */
      CGEN_ATTR_VALUE_TYPE preserve_ovf;
      SI msr0 = GET_MSR (0);

      preserve_ovf = CGEN_INSN_ATTR_VALUE (insn, CGEN_INSN_PRESERVE_OVF);
      if ((*vliw->current_vliw)[index] == UNIT_FM0)
	{
	  if (! preserve_ovf)
	    {
	      /* Clear MSR0.OVF and MSR0.SIE.  */
	      CLEAR_MSR_SIE (msr0);
	      CLEAR_MSR_OVF (msr0);
	    }
	}
      else
	{
	  if (! preserve_ovf)
	    {
	      /* Clear MSR1.OVF and MSR1.SIE.  */
	      SI msr1 = GET_MSR (1);
	      CLEAR_MSR_SIE (msr1);
	      CLEAR_MSR_OVF (msr1);
	      SET_MSR (1, msr1);
	    }
	}
      SET_MSR (0, msr0);
    } /* Insn is a media insns.  */
  COUNT_INSNS_IN_SLOT ((*vliw->current_vliw)[index]);
}