/* Main simulator entry points specific to the FRV.
   Copyright (C) 1998-2013 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 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/>.  */

#define WANT_CPU
#define WANT_CPU_FRVBF
#include "sim-main.h"
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include "sim-options.h"
#include "libiberty.h"
#include "bfd.h"
#include "elf-bfd.h"

static void free_state (SIM_DESC);
static void print_frv_misc_cpu (SIM_CPU *cpu, int verbose);

/* Records simulator descriptor so utilities like frv_dump_regs can be
   called from gdb.  */
SIM_DESC current_state;

/* Cover function of sim_state_free to free the cpu buffers as well.  */

static void
free_state (SIM_DESC sd)
{
  if (STATE_MODULES (sd) != NULL)
    sim_module_uninstall (sd);
  sim_cpu_free_all (sd);
  sim_state_free (sd);
}

/* Create an instance of the simulator.  */

SIM_DESC
sim_open (kind, callback, abfd, argv)
     SIM_OPEN_KIND kind;
     host_callback *callback;
     bfd *abfd;
     char **argv;
{
  char c;
  int i;
  unsigned long elf_flags = 0;
  SIM_DESC sd = sim_state_alloc (kind, callback);

  /* The cpu data is kept in a separately allocated chunk of memory.  */
  if (sim_cpu_alloc_all (sd, 1, cgen_cpu_max_extra_bytes ()) != SIM_RC_OK)
    {
      free_state (sd);
      return 0;
    }

#if 0 /* FIXME: pc is in mach-specific struct */
  /* FIXME: watchpoints code shouldn't need this */
  {
    SIM_CPU *current_cpu = STATE_CPU (sd, 0);
    STATE_WATCHPOINTS (sd)->pc = &(PC);
    STATE_WATCHPOINTS (sd)->sizeof_pc = sizeof (PC);
  }
#endif

  if (sim_pre_argv_init (sd, argv[0]) != SIM_RC_OK)
    {
      free_state (sd);
      return 0;
    }

  /* These options override any module options.
     Obviously ambiguity should be avoided, however the caller may wish to
     augment the meaning of an option.  */
  sim_add_option_table (sd, NULL, frv_options);

  /* getopt will print the error message so we just have to exit if this fails.
     FIXME: Hmmm...  in the case of gdb we need getopt to call
     print_filtered.  */
  if (sim_parse_args (sd, argv) != SIM_RC_OK)
    {
      free_state (sd);
      return 0;
    }

#if 0
  /* Allocate a handler for the control registers and other devices
     if no memory for that range has been allocated by the user.
     All are allocated in one chunk to keep things from being
     unnecessarily complicated.  */
  if (sim_core_read_buffer (sd, NULL, read_map, &c, FRV_DEVICE_ADDR, 1) == 0)
    sim_core_attach (sd, NULL,
		     0 /*level*/,
		     access_read_write,
		     0 /*space ???*/,
		     FRV_DEVICE_ADDR, FRV_DEVICE_LEN /*nr_bytes*/,
		     0 /*modulo*/,
		     &frv_devices,
		     NULL /*buffer*/);
#endif

  /* Allocate core managed memory if none specified by user.
     Use address 4 here in case the user wanted address 0 unmapped.  */
  if (sim_core_read_buffer (sd, NULL, read_map, &c, 4, 1) == 0)
    sim_do_commandf (sd, "memory region 0,0x%lx", FRV_DEFAULT_MEM_SIZE);

  /* check for/establish the reference program image */
  if (sim_analyze_program (sd,
			   (STATE_PROG_ARGV (sd) != NULL
			    ? *STATE_PROG_ARGV (sd)
			    : NULL),
			   abfd) != SIM_RC_OK)
    {
      free_state (sd);
      return 0;
    }

  /* set machine and architecture correctly instead of defaulting to frv */
  {
    bfd *prog_bfd = STATE_PROG_BFD (sd);
    if (prog_bfd != NULL)
      {
	struct elf_backend_data *backend_data;

	if (bfd_get_arch (prog_bfd) != bfd_arch_frv)
	  {
	    sim_io_eprintf (sd, "%s: \"%s\" is not a FRV object file\n",
			    STATE_MY_NAME (sd),
			    bfd_get_filename (prog_bfd));
	    free_state (sd);
	    return 0;
	  }

	backend_data = get_elf_backend_data (prog_bfd);

	if (backend_data != NULL)
	  backend_data->elf_backend_object_p (prog_bfd);

	elf_flags = elf_elfheader (prog_bfd)->e_flags;
      }
  }

  /* Establish any remaining configuration options.  */
  if (sim_config (sd) != SIM_RC_OK)
    {
      free_state (sd);
      return 0;
    }

  if (sim_post_argv_init (sd) != SIM_RC_OK)
    {
      free_state (sd);
      return 0;
    }

  /* Open a copy of the cpu descriptor table.  */
  {
    CGEN_CPU_DESC cd = frv_cgen_cpu_open_1 (STATE_ARCHITECTURE (sd)->printable_name,
					     CGEN_ENDIAN_BIG);
    for (i = 0; i < MAX_NR_PROCESSORS; ++i)
      {
	SIM_CPU *cpu = STATE_CPU (sd, i);
	CPU_CPU_DESC (cpu) = cd;
	CPU_DISASSEMBLER (cpu) = sim_cgen_disassemble_insn;
	CPU_ELF_FLAGS (cpu) = elf_flags;
      }
    frv_cgen_init_dis (cd);
  }

  /* Initialize various cgen things not done by common framework.
     Must be done after frv_cgen_cpu_open.  */
  cgen_init (sd);

  /* CPU specific initialization.  */
  for (i = 0; i < MAX_NR_PROCESSORS; ++i)
    {
      SIM_CPU* cpu = STATE_CPU (sd, i);
      frv_initialize (cpu, sd);
    }

  /* Store in a global so things like sparc32_dump_regs can be invoked
     from the gdb command line.  */
  current_state = sd;

  return sd;
}

void
sim_close (sd, quitting)
     SIM_DESC sd;
     int quitting;
{
  int i;
  /* Terminate cache support.  */
  for (i = 0; i < MAX_NR_PROCESSORS; ++i)
    {
      SIM_CPU* cpu = STATE_CPU (sd, i);
      frv_cache_term (CPU_INSN_CACHE (cpu));
      frv_cache_term (CPU_DATA_CACHE (cpu));
    }

  frv_cgen_cpu_close (CPU_CPU_DESC (STATE_CPU (sd, 0)));
  sim_module_uninstall (sd);
}

SIM_RC
sim_create_inferior (sd, abfd, argv, envp)
     SIM_DESC sd;
     bfd *abfd;
     char **argv;
     char **envp;
{
  SIM_CPU *current_cpu = STATE_CPU (sd, 0);
  SIM_ADDR addr;

  if (abfd != NULL)
    addr = bfd_get_start_address (abfd);
  else
    addr = 0;
  sim_pc_set (current_cpu, addr);

#if 0
  STATE_ARGV (sd) = sim_copy_argv (argv);
  STATE_ENVP (sd) = sim_copy_argv (envp);
#endif

  return SIM_RC_OK;
}