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/* CRIS base simulator support code

   Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010

   Free Software Foundation, Inc.

   Contributed by Axis Communications.

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 3 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, see <http://www.gnu.org/licenses/>.  */

/* The infrastructure is based on that of i960.c.  */

#define WANT_CPU

#include "sim-main.h"

#include "cgen-mem.h"

#include "cgen-ops.h"

#define MY(f) XCONCAT3(crisv,BASENUM,f)

/* Dispatcher for break insn.  */

USI

MY (f_break_handler) (SIM_CPU *cpu, USI breaknum, USI pc)

{

  SIM_DESC sd = CPU_STATE (cpu);

  USI ret = pc + 2;

  MY (f_h_pc_set) (cpu, ret);

  /* FIXME: Error out if IBR or ERP set.  */

  switch (breaknum)

    {

    case 13:

      MY (f_h_gr_set (cpu, 10,

                      cris_break_13_handler (cpu,

                                             MY (f_h_gr_get (cpu, 9)),

                                             MY (f_h_gr_get (cpu, 10)),

                                             MY (f_h_gr_get (cpu, 11)),

                                             MY (f_h_gr_get (cpu, 12)),

                                             MY (f_h_gr_get (cpu, 13)),

                                             MY (f_h_sr_get (cpu, 7)),

                                             MY (f_h_sr_get (cpu, 11)),

                                             pc)));

      break;

    case 14:

      sim_io_printf (sd, "%x\n", MY (f_h_gr_get (cpu, 3)));

      break;

    case 15:

      /* Re-use the Linux exit call.  */

      cris_break_13_handler (cpu, /* TARGET_SYS_exit */ 1, 0,

                             0, 0, 0, 0, 0, pc);

    default:

      abort ();

    }

  return MY (f_h_pc_get) (cpu);

}

/* Accessor function for simulator internal use.

   Note the contents of BUF are in target byte order.  */

int

MY (f_fetch_register) (SIM_CPU *current_cpu, int rn,

                      unsigned char *buf, int len ATTRIBUTE_UNUSED)

{

  SETTSI (buf, XCONCAT3(crisv,BASENUM,f_h_gr_get) (current_cpu, rn));

  return -1;

}

/* Accessor function for simulator internal use.

   Note the contents of BUF are in target byte order.  */

int

MY (f_store_register) (SIM_CPU *current_cpu, int rn,

                      unsigned char *buf, int len ATTRIBUTE_UNUSED)

{

  XCONCAT3(crisv,BASENUM,f_h_gr_set) (current_cpu, rn, GETTSI (buf));

  return -1;

}

#if WITH_PROFILE_MODEL_P

/* FIXME: Some of these should be inline or macros.  Later.  */

/* Initialize cycle counting for an insn.

   FIRST_P is non-zero if this is the first insn in a set of parallel

   insns.  */

void

MY (f_model_insn_before) (SIM_CPU *current_cpu, int first_p ATTRIBUTE_UNUSED)

{

  /* To give the impression that we actually know what PC is, we have to

     dump register contents *before* the *next* insn, not after the

     *previous* insn.  Uhh...  */

  /* FIXME: Move this to separate, overridable function.  */

  if ((CPU_CRIS_MISC_PROFILE (current_cpu)->flags

       & FLAG_CRIS_MISC_PROFILE_XSIM_TRACE)

#ifdef GET_H_INSN_PREFIXED_P

      /* For versions with prefixed insns, trace the combination as

         one insn.  */

      && !GET_H_INSN_PREFIXED_P ()

#endif

      && 1)

  {

    int i;

    char flags[7];

    unsigned64 cycle_count;

    SIM_DESC sd = CPU_STATE (current_cpu);

    cris_trace_printf (sd, current_cpu, "%lx ",

                       0xffffffffUL & (unsigned long) (CPU (h_pc)));

    for (i = 0; i < 15; i++)

      cris_trace_printf (sd, current_cpu, "%lx ",

                         0xffffffffUL

                         & (unsigned long) (XCONCAT3(crisv,BASENUM,

                                                     f_h_gr_get) (current_cpu,

                                                                  i)));

    flags[0] = GET_H_IBIT () != 0 ? 'I' : 'i';

    flags[1] = GET_H_XBIT () != 0 ? 'X' : 'x';

    flags[2] = GET_H_NBIT () != 0 ? 'N' : 'n';

    flags[3] = GET_H_ZBIT () != 0 ? 'Z' : 'z';

    flags[4] = GET_H_VBIT () != 0 ? 'V' : 'v';

    flags[5] = GET_H_CBIT () != 0 ? 'C' : 'c';

    flags[6] = 0;

    /* For anything else than basic tracing we'd add stall cycles for

       e.g. unaligned accesses.  FIXME: add --cris-trace=x options to

       match --cris-cycles=x.  */

    cycle_count

      = (CPU_CRIS_MISC_PROFILE (current_cpu)->basic_cycle_count

         - CPU_CRIS_PREV_MISC_PROFILE (current_cpu)->basic_cycle_count);

    /* Emit ACR after flags and cycle count for this insn.  */

    if (BASENUM == 32)

      cris_trace_printf (sd, current_cpu, "%s %d %lx\n", flags,

                         (int) cycle_count,

                         0xffffffffUL

                         & (unsigned long) (XCONCAT3(crisv,BASENUM,

                                                     f_h_gr_get) (current_cpu,

                                                                  15)));

    else

      cris_trace_printf (sd, current_cpu, "%s %d\n", flags,

                         (int) cycle_count);

    CPU_CRIS_PREV_MISC_PROFILE (current_cpu)[0]

      = CPU_CRIS_MISC_PROFILE (current_cpu)[0];

  }

}

/* Record the cycles computed for an insn.

   LAST_P is non-zero if this is the last insn in a set of parallel insns,

   and we update the total cycle count.

   CYCLES is the cycle count of the insn.  */

void

MY (f_model_insn_after) (SIM_CPU *current_cpu, int last_p ATTRIBUTE_UNUSED,

                         int cycles)

{

  PROFILE_DATA *p = CPU_PROFILE_DATA (current_cpu);

  PROFILE_MODEL_TOTAL_CYCLES (p) += cycles;

  CPU_CRIS_MISC_PROFILE (current_cpu)->basic_cycle_count += cycles;

  PROFILE_MODEL_CUR_INSN_CYCLES (p) = cycles;

#if WITH_HW

  /* For some reason, we don't get to the sim_events_tick call in

     cgen-run.c:engine_run_1.  Besides, more than one cycle has

     passed, so we want sim_events_tickn anyway.  The "events we want

     to process" is usually to initiate an interrupt, but might also

     be other events.  We can't do the former until the main loop is

     at point where it accepts changing the PC without internal

     inconsistency, so just set a flag and wait.  */

  if (sim_events_tickn (CPU_STATE (current_cpu), cycles))

    STATE_EVENTS (CPU_STATE (current_cpu))->work_pending = 1;

#endif

}

/* Initialize cycle counting for an insn.

   FIRST_P is non-zero if this is the first insn in a set of parallel

   insns.  */

void

MY (f_model_init_insn_cycles) (SIM_CPU *current_cpu ATTRIBUTE_UNUSED,

                               int first_p ATTRIBUTE_UNUSED)

{

  abort ();

}

/* Record the cycles computed for an insn.

   LAST_P is non-zero if this is the last insn in a set of parallel insns,

   and we update the total cycle count.  */

void

MY (f_model_update_insn_cycles) (SIM_CPU *current_cpu ATTRIBUTE_UNUSED,

                                 int last_p ATTRIBUTE_UNUSED)

{

  abort ();

}

#if 0

void

MY (f_model_record_cycles) (SIM_CPU *current_cpu, unsigned long cycles)

{

  abort ();

}

void

MY (f_model_mark_get_h_gr) (SIM_CPU *current_cpu, ARGBUF *abuf)

{

  abort ();

}

void

MY (f_model_mark_set_h_gr) (SIM_CPU *current_cpu, ARGBUF *abuf)

{

  abort ();

}

#endif

/* Set the thread register contents.  */

void

MY (set_target_thread_data) (SIM_CPU *current_cpu, USI val)

{

  (CPU (XCONCAT2 (h_sr_v, BASENUM) [CRIS_TLS_REGISTER])) = val;

}

/* Create the context for a thread.  */

void *

MY (make_thread_cpu_data) (SIM_CPU *current_cpu, void *context)

{

  void *info = xmalloc (current_cpu->thread_cpu_data_size);

  if (context != NULL)

    memcpy (info,

            context,

            current_cpu->thread_cpu_data_size);

  else

    memset (info, 0, current_cpu->thread_cpu_data_size),abort();

  return info;

}

/* Hook function for per-cpu simulator initialization.  */

void

MY (f_specific_init) (SIM_CPU *current_cpu)

{

  current_cpu->make_thread_cpu_data = MY (make_thread_cpu_data);

  current_cpu->thread_cpu_data_size = sizeof (current_cpu->cpu_data);

  current_cpu->set_target_thread_data = MY (set_target_thread_data);

#if WITH_HW

  current_cpu->deliver_interrupt = MY (deliver_interrupt);

#endif

}

/* Model function for arbitrary single stall cycles.  */

int

MY (XCONCAT3 (f_model_crisv,BASENUM,

              _u_stall)) (SIM_CPU *current_cpu ATTRIBUTE_UNUSED,

                          const IDESC *idesc,

                          int unit_num,

                          int referenced ATTRIBUTE_UNUSED)

{

  return idesc->timing->units[unit_num].done;

}

#ifndef SPECIFIC_U_SKIP4_FN

/* Model function for u-skip4 unit.  */

int

MY (XCONCAT3 (f_model_crisv,BASENUM,

              _u_skip4)) (SIM_CPU *current_cpu,

                          const IDESC *idesc,

                          int unit_num,

                          int referenced ATTRIBUTE_UNUSED)

{

  /* Handle PC not being updated with pbb.  FIXME: What if not pbb?  */

  CPU (h_pc) += 4;

  return idesc->timing->units[unit_num].done;

}

#endif

#ifndef SPECIFIC_U_EXEC_FN

/* Model function for u-exec unit.  */

int

MY (XCONCAT3 (f_model_crisv,BASENUM,

              _u_exec)) (SIM_CPU *current_cpu,

                         const IDESC *idesc,

                         int unit_num, int referenced ATTRIBUTE_UNUSED)

{

  /* Handle PC not being updated with pbb.  FIXME: What if not pbb?  */

  CPU (h_pc) += 2;

  return idesc->timing->units[unit_num].done;

}

#endif

#ifndef SPECIFIC_U_MEM_FN

/* Model function for u-mem unit.  */

int

MY (XCONCAT3 (f_model_crisv,BASENUM,

              _u_mem)) (SIM_CPU *current_cpu ATTRIBUTE_UNUSED,

                        const IDESC *idesc,

                        int unit_num,

                        int referenced ATTRIBUTE_UNUSED)

{

  return idesc->timing->units[unit_num].done;

}

#endif

#ifndef SPECIFIC_U_CONST16_FN

/* Model function for u-const16 unit.  */

int

MY (XCONCAT3 (f_model_crisv,BASENUM,

              _u_const16)) (SIM_CPU *current_cpu,

                            const IDESC *idesc,

                            int unit_num,

                            int referenced ATTRIBUTE_UNUSED)

{

  CPU (h_pc) += 2;

  return idesc->timing->units[unit_num].done;

}

#endif /* SPECIFIC_U_CONST16_FN */

#ifndef SPECIFIC_U_CONST32_FN

/* This will be incorrect for early models, where a dword always take

   two cycles.  */

#define CRIS_MODEL_MASK_PC_STALL 2

/* Model function for u-const32 unit.  */

int

MY (XCONCAT3 (f_model_crisv,BASENUM,

              _u_const32)) (SIM_CPU *current_cpu,

                            const IDESC *idesc,

                            int unit_num,

                            int referenced ATTRIBUTE_UNUSED)

{

  int unaligned_extra

    = (((CPU (h_pc) + 2) & CRIS_MODEL_MASK_PC_STALL)

       == CRIS_MODEL_MASK_PC_STALL);

  /* Handle PC not being updated with pbb.  FIXME: What if not pbb?  */

  CPU_CRIS_MISC_PROFILE (current_cpu)->unaligned_mem_dword_count

    += unaligned_extra;

  CPU (h_pc) += 4;

  return idesc->timing->units[unit_num].done;

}

#endif /* SPECIFIC_U_CONST32_FN */

#ifndef SPECIFIC_U_MOVEM_FN

/* Model function for u-movem unit.  */

int

MY (XCONCAT3 (f_model_crisv,BASENUM,

              _u_movem)) (SIM_CPU *current_cpu ATTRIBUTE_UNUSED,

                          const IDESC *idesc ATTRIBUTE_UNUSED,

                          int unit_num ATTRIBUTE_UNUSED,

                          int referenced ATTRIBUTE_UNUSED,

                          INT limreg)

{

  /* FIXME: Add cycles for misalignment.  */

  if (limreg == -1)

    abort ();

  /* We don't record movem move cycles in movemsrc_stall_count since

     those cycles have historically been handled as ordinary cycles.  */

  return limreg + 1;

}

#endif /* SPECIFIC_U_MOVEM_FN */

#endif /* WITH_PROFILE_MODEL_P */