sim/common/sim-config.c

/* The common simulator framework for GDB, the GNU Debugger.

   Copyright 2002-2023 Free Software Foundation, Inc.

   Contributed by Andrew Cagney and Red Hat.

   This file is part of GDB.

   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/>.  */

/* This must come before any other includes.  */
#include "defs.h"

#include "bfd.h"

#include "sim-main.h"
#include "sim-assert.h"


enum bfd_endian current_target_byte_order = BFD_ENDIAN_UNKNOWN;
int current_stdio;

enum sim_alignments current_alignment;

#if defined (WITH_FLOATING_POINT)
int current_floating_point;
#endif



/* map a byte order onto a textual string */

static const char *
config_byte_order_to_a (enum bfd_endian byte_order)
{
  switch (byte_order)
    {
    case BFD_ENDIAN_LITTLE:
      return "LITTLE_ENDIAN";
    case BFD_ENDIAN_BIG:
      return "BIG_ENDIAN";
    case BFD_ENDIAN_UNKNOWN:
      return "UNKNOWN_ENDIAN";
    }
  return "UNKNOWN";
}


static const char *
config_stdio_to_a (int stdio)
{
  switch (stdio)
    {
    case DONT_USE_STDIO:
      return "DONT_USE_STDIO";
    case DO_USE_STDIO:
      return "DO_USE_STDIO";
    case 0:
      return "0";
    }
  return "UNKNOWN";
}


static const char *
config_environment_to_a (enum sim_environment environment)
{
  switch (environment)
    {
    case ALL_ENVIRONMENT:
      return "ALL_ENVIRONMENT";
    case USER_ENVIRONMENT:
      return "USER_ENVIRONMENT";
    case VIRTUAL_ENVIRONMENT:
      return "VIRTUAL_ENVIRONMENT";
    case OPERATING_ENVIRONMENT:
      return "OPERATING_ENVIRONMENT";
    }
  return "UNKNOWN";
}


static const char *
config_alignment_to_a (enum sim_alignments alignment)
{
  switch (alignment)
    {
    case MIXED_ALIGNMENT:
      return "MIXED_ALIGNMENT";
    case NONSTRICT_ALIGNMENT:
      return "NONSTRICT_ALIGNMENT";
    case STRICT_ALIGNMENT:
      return "STRICT_ALIGNMENT";
    case FORCED_ALIGNMENT:
      return "FORCED_ALIGNMENT";
    }
  return "UNKNOWN";
}


#if defined (WITH_FLOATING_POINT)
static const char *
config_floating_point_to_a (int floating_point)
{
  switch (floating_point)
    {
    case SOFT_FLOATING_POINT:
      return "SOFT_FLOATING_POINT";
    case HARD_FLOATING_POINT:
      return "HARD_FLOATING_POINT";
    case 0:
      return "0";
    }
  return "UNKNOWN";
}
#endif

/* Set the default environment, prior to parsing argv.  */

void
sim_config_default (SIM_DESC sd)
{
   /* Set the current environment to ALL_ENVIRONMENT to indicate none has been
      selected yet.  This is so that after parsing argv, we know whether the
      environment was explicitly specified or not.  */
  STATE_ENVIRONMENT (sd) = ALL_ENVIRONMENT;
}

/* Complete and verify the simulation environment.  */

SIM_RC
sim_config (SIM_DESC sd)
{
  enum bfd_endian prefered_target_byte_order;
  SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);

  /* extract all relevant information */
  if (STATE_PROG_BFD (sd) == NULL
      /* If we have a binary input file (presumably with specified
	 "--architecture"), it'll have no endianness.  */
      || (!bfd_little_endian (STATE_PROG_BFD (sd))
	  && !bfd_big_endian (STATE_PROG_BFD (sd))))
    prefered_target_byte_order = BFD_ENDIAN_UNKNOWN;
  else
    prefered_target_byte_order = (bfd_little_endian (STATE_PROG_BFD (sd))
				  ? BFD_ENDIAN_LITTLE
				  : BFD_ENDIAN_BIG);

  /* set the target byte order */
#if (WITH_TREE_PROPERTIES)
  if (current_target_byte_order == BFD_ENDIAN_UNKNOWN)
    current_target_byte_order
      = (tree_find_boolean_property (root, "/options/little-endian?")
	 ? BFD_ENDIAN_LITTLE
	 : BFD_ENDIAN_BIG);
#endif
  if (current_target_byte_order == BFD_ENDIAN_UNKNOWN
      && prefered_target_byte_order != BFD_ENDIAN_UNKNOWN)
    current_target_byte_order = prefered_target_byte_order;
  if (current_target_byte_order == BFD_ENDIAN_UNKNOWN)
    current_target_byte_order = WITH_TARGET_BYTE_ORDER;

  /* verify the target byte order */
  if (CURRENT_TARGET_BYTE_ORDER == BFD_ENDIAN_UNKNOWN)
    {
      sim_io_eprintf (sd, "Target byte order unspecified\n");
      return SIM_RC_FAIL;
    }
  if (CURRENT_TARGET_BYTE_ORDER != current_target_byte_order)
    sim_io_eprintf (sd, "Target (%s) and configured (%s) byte order in conflict\n",
		  config_byte_order_to_a (current_target_byte_order),
		  config_byte_order_to_a (CURRENT_TARGET_BYTE_ORDER));
  if (prefered_target_byte_order != BFD_ENDIAN_UNKNOWN
      && CURRENT_TARGET_BYTE_ORDER != prefered_target_byte_order)
    sim_io_eprintf (sd, "Target (%s) and specified (%s) byte order in conflict\n",
		  config_byte_order_to_a (CURRENT_TARGET_BYTE_ORDER),
		  config_byte_order_to_a (prefered_target_byte_order));


  /* set the stdio */
  if (current_stdio == 0)
    current_stdio = WITH_STDIO;
  if (current_stdio == 0)
    current_stdio = DO_USE_STDIO;

  /* verify the stdio */
  if (CURRENT_STDIO == 0)
    {
      sim_io_eprintf (sd, "Target standard IO unspecified\n");
      return SIM_RC_FAIL;
    }
  if (CURRENT_STDIO != current_stdio)
    {
      sim_io_eprintf (sd, "Target (%s) and configured (%s) standard IO in conflict\n",
		      config_stdio_to_a (CURRENT_STDIO),
		      config_stdio_to_a (current_stdio));
      return SIM_RC_FAIL;
    }


  /* check the value of MSB */
  if (WITH_TARGET_WORD_MSB != 0
      && WITH_TARGET_WORD_MSB != (WITH_TARGET_WORD_BITSIZE - 1))
    {
      sim_io_eprintf (sd, "Target bitsize (%d) contradicts target most significant bit (%d)\n",
		      WITH_TARGET_WORD_BITSIZE, WITH_TARGET_WORD_MSB);
      return SIM_RC_FAIL;
    }


  /* set the environment */
#if (WITH_TREE_PROPERTIES)
  if (STATE_ENVIRONMENT (sd) == ALL_ENVIRONMENT)
    {
      const char *env =
	tree_find_string_property (root, "/openprom/options/env");
      STATE_ENVIRONMENT (sd) = ((strcmp (env, "user") == 0
				 || strcmp (env, "uea") == 0)
				? USER_ENVIRONMENT
				: (strcmp (env, "virtual") == 0
				   || strcmp (env, "vea") == 0)
				? VIRTUAL_ENVIRONMENT
				: (strcmp (env, "operating") == 0
				   || strcmp (env, "oea") == 0)
				? OPERATING_ENVIRONMENT
				: ALL_ENVIRONMENT);
    }
#endif
  if (STATE_ENVIRONMENT (sd) == ALL_ENVIRONMENT)
    STATE_ENVIRONMENT (sd) = (WITH_ENVIRONMENT != ALL_ENVIRONMENT ?
			      WITH_ENVIRONMENT : USER_ENVIRONMENT);


  /* set the alignment */
#if (WITH_TREE_PROPERTIES)
  if (current_alignment == 0)
    current_alignment =
      (tree_find_boolean_property (root, "/openprom/options/strict-alignment?")
       ? STRICT_ALIGNMENT
       : NONSTRICT_ALIGNMENT);
#endif
  if (current_alignment == 0)
    current_alignment = WITH_ALIGNMENT;
  /* If the port hasn't specified an alignment, default to not enforcing.  */
  if (current_alignment == 0)
    current_alignment = NONSTRICT_ALIGNMENT;

  /* verify the alignment */
  if (CURRENT_ALIGNMENT == 0)
    {
      sim_io_eprintf (sd, "Target alignment unspecified\n");
      return SIM_RC_FAIL;
    }
  if (CURRENT_ALIGNMENT != current_alignment)
    {
      sim_io_eprintf (sd, "Target (%s) and configured (%s) alignment in conflict\n",
		      config_alignment_to_a (CURRENT_ALIGNMENT),
		      config_alignment_to_a (current_alignment));
      return SIM_RC_FAIL;
    }

#if defined (WITH_FLOATING_POINT)

  /* set the floating point */
  if (current_floating_point == 0)
    current_floating_point = WITH_FLOATING_POINT;

  /* verify the floating point */
  if (CURRENT_FLOATING_POINT == 0)
    {
      sim_io_eprintf (sd, "Target floating-point unspecified\n");
      return SIM_RC_FAIL;
    }
  if (CURRENT_FLOATING_POINT != current_floating_point)
    {
      sim_io_eprintf (sd, "Target (%s) and configured (%s) floating-point in conflict\n",
		      config_alignment_to_a (CURRENT_FLOATING_POINT),
		      config_alignment_to_a (current_floating_point));
      return SIM_RC_FAIL;
    }

#endif
  return SIM_RC_OK;
}


void
sim_config_print (SIM_DESC sd)
{
  sim_io_printf (sd, "WITH_TARGET_BYTE_ORDER = %s\n",
		 config_byte_order_to_a (WITH_TARGET_BYTE_ORDER));

  sim_io_printf (sd, "HOST_BYTE_ORDER = %s\n",
		 config_byte_order_to_a (HOST_BYTE_ORDER));

  sim_io_printf (sd, "WITH_STDIO = %s\n",
		 config_stdio_to_a (WITH_STDIO));

  sim_io_printf (sd, "WITH_TARGET_WORD_MSB = %d\n",
		 WITH_TARGET_WORD_MSB);

  sim_io_printf (sd, "WITH_TARGET_WORD_BITSIZE = %d\n",
		 WITH_TARGET_WORD_BITSIZE);

  sim_io_printf (sd, "WITH_TARGET_ADDRESS_BITSIZE = %d\n",
		 WITH_TARGET_ADDRESS_BITSIZE);

  sim_io_printf (sd, "WITH_TARGET_CELL_BITSIZE = %d\n",
		 WITH_TARGET_CELL_BITSIZE);

  sim_io_printf (sd, "WITH_TARGET_FLOATING_POINT_BITSIZE = %d\n",
		 WITH_TARGET_FLOATING_POINT_BITSIZE);

  sim_io_printf (sd, "WITH_ENVIRONMENT = %s\n",
		 config_environment_to_a (WITH_ENVIRONMENT));

  sim_io_printf (sd, "WITH_ALIGNMENT = %s\n",
		 config_alignment_to_a (WITH_ALIGNMENT));

#if defined (WITH_XOR_ENDIAN)
  sim_io_printf (sd, "WITH_XOR_ENDIAN = %d\n", WITH_XOR_ENDIAN);
#endif

#if defined (WITH_FLOATING_POINT)
  sim_io_printf (sd, "WITH_FLOATING_POINT = %s\n",
		 config_floating_point_to_a (WITH_FLOATING_POINT));
#endif

#if defined (WITH_SMP)
  sim_io_printf (sd, "WITH_SMP = %d\n", WITH_SMP);
#endif

#if defined (WITH_RESERVED_BITS)
  sim_io_printf (sd, "WITH_RESERVED_BITS = %d\n", WITH_RESERVED_BITS);
#endif

#if defined (WITH_PROFILE)
  sim_io_printf (sd, "WITH_PROFILE = %d\n", WITH_PROFILE);
#endif

}