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/* Simulator memory option handling.

   Copyright (C) 1996-1999, 2007, 2008, 2009, 2010

   Free Software Foundation, Inc.

   Contributed by Cygnus Support.

This file is part of GDB, the GNU debugger.

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/>.  */

#include "cconfig.h"

#include "sim-main.h"

#include "sim-assert.h"

#include "sim-options.h"

#ifdef HAVE_STRING_H

#include <string.h>

#else

#ifdef HAVE_STRINGS_H

#include <strings.h>

#endif

#endif

#ifdef HAVE_STDLIB_H

#include <stdlib.h>

#endif

#ifdef HAVE_ERRNO_H

#include <errno.h>

#endif

#ifdef HAVE_FCNTL_H

#include <fcntl.h>

#endif

#ifdef HAVE_SYS_MMAN_H

#include <sys/mman.h>

#endif

#ifdef HAVE_SYS_STAT_H

#include <sys/stat.h>

#endif

#ifdef HAVE_UNISTD_H

#include <unistd.h>

#endif

/* Memory fill byte. */

static unsigned8 fill_byte_value;

static int fill_byte_flag = 0;

/* Memory mapping; see OPTION_MEMORY_MAPFILE. */

static int mmap_next_fd = -1;

/* Memory command line options. */

enum {

  OPTION_MEMORY_DELETE = OPTION_START,

  OPTION_MEMORY_REGION,

  OPTION_MEMORY_SIZE,

  OPTION_MEMORY_INFO,

  OPTION_MEMORY_ALIAS,

  OPTION_MEMORY_CLEAR,

  OPTION_MEMORY_FILL,

  OPTION_MEMORY_MAPFILE

};

static DECLARE_OPTION_HANDLER (memory_option_handler);

static const OPTION memory_options[] =

{

  { {"memory-delete", required_argument, NULL, OPTION_MEMORY_DELETE },

      '\0', "ADDRESS|all", "Delete memory at ADDRESS (all addresses)",

      memory_option_handler },

  { {"delete-memory", required_argument, NULL, OPTION_MEMORY_DELETE },

      '\0', "ADDRESS", NULL,

      memory_option_handler },

  { {"memory-region", required_argument, NULL, OPTION_MEMORY_REGION },

      '\0', "ADDRESS,SIZE[,MODULO]", "Add a memory region",

      memory_option_handler },

  { {"memory-alias", required_argument, NULL, OPTION_MEMORY_ALIAS },

      '\0', "ADDRESS,SIZE{,ADDRESS}", "Add memory shadow",

      memory_option_handler },

  { {"memory-size", required_argument, NULL, OPTION_MEMORY_SIZE },

      '\0', "<size>[in bytes, Kb (k suffix), Mb (m suffix) or Gb (g suffix)]",

     "Add memory at address zero", memory_option_handler },

  { {"memory-fill", required_argument, NULL, OPTION_MEMORY_FILL },

      '\0', "VALUE", "Fill subsequently added memory regions",

      memory_option_handler },

  { {"memory-clear", no_argument, NULL, OPTION_MEMORY_CLEAR },

      '\0', NULL, "Clear subsequently added memory regions",

      memory_option_handler },

#if defined(HAVE_MMAP) && defined(HAVE_MUNMAP)

  { {"memory-mapfile", required_argument, NULL, OPTION_MEMORY_MAPFILE },

      '\0', "FILE", "Memory-map next memory region from file",

      memory_option_handler },

#endif

  { {"memory-info", no_argument, NULL, OPTION_MEMORY_INFO },

      '\0', NULL, "List configurable memory regions",

      memory_option_handler },

  { {"info-memory", no_argument, NULL, OPTION_MEMORY_INFO },

      '\0', NULL, NULL,

      memory_option_handler },

  { {NULL, no_argument, NULL, 0}, '\0', NULL, NULL, NULL }

};

static sim_memopt *

do_memopt_add (SIM_DESC sd,

               int level,

               int space,

               address_word addr,

               address_word nr_bytes,

               unsigned modulo,

               sim_memopt **entry,

               void *buffer)

{

  void *fill_buffer;

  unsigned fill_length;

  void *free_buffer;

  unsigned long free_length;

  if (buffer != NULL)

    {

      /* Buffer already given.  sim_memory_uninstall will free it. */

      sim_core_attach (sd, NULL,

                       level, access_read_write_exec, space,

                       addr, nr_bytes, modulo, NULL, buffer);

      free_buffer = buffer;

      free_length = 0;

      fill_buffer = buffer;

      fill_length = (modulo == 0) ? nr_bytes : modulo;

    }

  else

    {

      /* Allocate new well-aligned buffer, just as sim_core_attach(). */

      void *aligned_buffer;

      int padding = (addr % sizeof (unsigned64));

      unsigned long bytes = (modulo == 0 ? nr_bytes : modulo) + padding;

      free_buffer = NULL;

      free_length = bytes;

#ifdef HAVE_MMAP

      /* Memory map or malloc(). */

      if (mmap_next_fd >= 0)

        {

          /* Check that given file is big enough. */

          struct stat s;

          int rc;

          /* Some kernels will SIGBUS the application if mmap'd file

             is not large enough.  */

          rc = fstat (mmap_next_fd, &s);

          if (rc < 0 || s.st_size < bytes)

            {

              sim_io_error (sd,

                            "Error, cannot confirm that mmap file is large enough "

                            "(>= %ld bytes)\n", bytes);

            }

          free_buffer = mmap (0, bytes, PROT_READ|PROT_WRITE, MAP_SHARED, mmap_next_fd, 0);

          if (free_buffer == 0 || free_buffer == (char*)-1) /* MAP_FAILED */

            {

              sim_io_error (sd, "Error, cannot mmap file (%s).\n",

                            strerror(errno));

            }

        }

#endif 

      /* Need heap allocation? */

      if (free_buffer == NULL)

        {

          /* If filling with non-zero value, do not use clearing allocator. */

          if (fill_byte_flag && fill_byte_value != 0)

            free_buffer = xmalloc (bytes); /* don't clear */

          else

            free_buffer = zalloc (bytes); /* clear */

        }

      aligned_buffer = (char*) free_buffer + padding;

      sim_core_attach (sd, NULL,

                       level, access_read_write_exec, space,

                       addr, nr_bytes, modulo, NULL, aligned_buffer);

      fill_buffer = aligned_buffer;

      fill_length = (modulo == 0) ? nr_bytes : modulo;

      /* If we just used a clearing allocator, and are about to fill with

         zero, truncate the redundant fill operation. */

      if (fill_byte_flag && fill_byte_value == 0)

         fill_length = 1; /* avoid boundary length=0 case */

    }

  if (fill_byte_flag)

    {

      ASSERT (fill_buffer != 0);

      memset ((char*) fill_buffer, fill_byte_value, fill_length);

    }

  while ((*entry) != NULL)

    entry = &(*entry)->next;

  (*entry) = ZALLOC (sim_memopt);

  (*entry)->level = level;

  (*entry)->space = space;

  (*entry)->addr = addr;

  (*entry)->nr_bytes = nr_bytes;

  (*entry)->modulo = modulo;

  (*entry)->buffer = free_buffer;

  /* Record memory unmapping info.  */

  if (mmap_next_fd >= 0)

    {

      (*entry)->munmap_length = free_length;

      close (mmap_next_fd);

      mmap_next_fd = -1;

    }

  else

    (*entry)->munmap_length = 0;

  return (*entry);

}

static SIM_RC

do_memopt_delete (SIM_DESC sd,

                  int level,

                  int space,

                  address_word addr)

{

  sim_memopt **entry = &STATE_MEMOPT (sd);

  sim_memopt *alias;

  while ((*entry) != NULL

         && ((*entry)->level != level

              || (*entry)->space != space

              || (*entry)->addr != addr))

    entry = &(*entry)->next;

  if ((*entry) == NULL)

    {

      sim_io_eprintf (sd, "Memory at 0x%lx not found, not deleted\n",

                      (long) addr);

      return SIM_RC_FAIL;

    }

  /* delete any buffer */

  if ((*entry)->buffer != NULL)

    {

#ifdef HAVE_MUNMAP

      if ((*entry)->munmap_length > 0)

        munmap ((*entry)->buffer, (*entry)->munmap_length);

      else

#endif

        zfree ((*entry)->buffer);

    }

  /* delete it and its aliases */

  alias = *entry;

  *entry = (*entry)->next;

  while (alias != NULL)

    {

      sim_memopt *dead = alias;

      alias = alias->alias;

      sim_core_detach (sd, NULL, dead->level, dead->space, dead->addr);

      zfree (dead);

    }

  return SIM_RC_OK;

}

static char *

parse_size (char *chp,

            address_word *nr_bytes,

            unsigned *modulo)

{

  /* <nr_bytes>[K|M|G] [ "%" <modulo> ] */

  *nr_bytes = strtoul (chp, &chp, 0);

  switch (*chp)

    {

    case '%':

      *modulo = strtoul (chp + 1, &chp, 0);

      break;

    case 'g': case 'G': /* Gigabyte suffix.  */

      *nr_bytes <<= 10;

      /* Fall through.  */

    case 'm': case 'M': /* Megabyte suffix.  */

      *nr_bytes <<= 10;

      /* Fall through.  */

    case 'k': case 'K': /* Kilobyte suffix.  */

      *nr_bytes <<= 10;

      /* Check for a modulo specifier after the suffix.  */

      ++ chp;

      if (* chp == 'b' || * chp == 'B')

        ++ chp;

      if (* chp == '%')

        *modulo = strtoul (chp + 1, &chp, 0);

      break;

    }

  return chp;

}

static char *

parse_ulong_value (char *chp,

                     unsigned long *value)

{

  *value = strtoul (chp, &chp, 0);

  return chp;

}

static char *

parse_addr (char *chp,

            int *level,

            int *space,

            address_word *addr)

{

  /* [ <space> ": " ] <addr> [ "@" <level> ] */

  *addr = (unsigned long) strtoul (chp, &chp, 0);

  if (*chp == ':')

    {

      *space = *addr;

      *addr = (unsigned long) strtoul (chp + 1, &chp, 0);

    }

  if (*chp == '@')

    {

      *level = strtoul (chp + 1, &chp, 0);

    }

  return chp;

}

static SIM_RC

memory_option_handler (SIM_DESC sd, sim_cpu *cpu, int opt,

                       char *arg, int is_command)

{

  switch (opt)

    {

    case OPTION_MEMORY_DELETE:

      if (strcasecmp (arg, "all") == 0)

        {

          while (STATE_MEMOPT (sd) != NULL)

            do_memopt_delete (sd,

                              STATE_MEMOPT (sd)->level,

                              STATE_MEMOPT (sd)->space,

                              STATE_MEMOPT (sd)->addr);

          return SIM_RC_OK;

        }

      else

        {

          int level = 0;

          int space = 0;

          address_word addr = 0;

          parse_addr (arg, &level, &space, &addr);

          return do_memopt_delete (sd, level, space, addr);

        }

    case OPTION_MEMORY_REGION:

      {

        char *chp = arg;

        int level = 0;

        int space = 0;

        address_word addr = 0;

        address_word nr_bytes = 0;

        unsigned modulo = 0;

        /* parse the arguments */

        chp = parse_addr (chp, &level, &space, &addr);

        if (*chp != ',')

          {

            sim_io_eprintf (sd, "Missing size for memory-region\n");

            return SIM_RC_FAIL;

          }

        chp = parse_size (chp + 1, &nr_bytes, &modulo);

        /* old style */

        if (*chp == ',')

          modulo = strtoul (chp + 1, &chp, 0);

        /* try to attach/insert it */

        do_memopt_add (sd, level, space, addr, nr_bytes, modulo,

                       &STATE_MEMOPT (sd), NULL);

        return SIM_RC_OK;

      }

    case OPTION_MEMORY_ALIAS:

      {

        char *chp = arg;

        int level = 0;

        int space = 0;

        address_word addr = 0;

        address_word nr_bytes = 0;

        unsigned modulo = 0;

        sim_memopt *entry;

        /* parse the arguments */

        chp = parse_addr (chp, &level, &space, &addr);

        if (*chp != ',')

          {

            sim_io_eprintf (sd, "Missing size for memory-region\n");

            return SIM_RC_FAIL;

          }

        chp = parse_size (chp + 1, &nr_bytes, &modulo);

        /* try to attach/insert the main record */

        entry = do_memopt_add (sd, level, space, addr, nr_bytes, modulo,

                               &STATE_MEMOPT (sd),

                               NULL);

        /* now attach all the aliases */

        while (*chp == ',')

          {

            int a_level = level;

            int a_space = space;

            address_word a_addr = addr;

            chp = parse_addr (chp + 1, &a_level, &a_space, &a_addr);

            do_memopt_add (sd, a_level, a_space, a_addr, nr_bytes, modulo,

                           &entry->alias, entry->buffer);

          }

        return SIM_RC_OK;

      }

    case OPTION_MEMORY_SIZE:

      {

        int level = 0;

        int space = 0;

        address_word addr = 0;

        address_word nr_bytes = 0;

        unsigned modulo = 0;

        /* parse the arguments */

        parse_size (arg, &nr_bytes, &modulo);

        /* try to attach/insert it */

        do_memopt_add (sd, level, space, addr, nr_bytes, modulo,

                       &STATE_MEMOPT (sd), NULL);

        return SIM_RC_OK;

      }

    case OPTION_MEMORY_CLEAR:

      {

        fill_byte_value = (unsigned8) 0;

        fill_byte_flag = 1;

        return SIM_RC_OK;

        break;

      }

    case OPTION_MEMORY_FILL:

      {

        unsigned long fill_value;

        parse_ulong_value (arg, &fill_value);

        if (fill_value > 255)

          {

            sim_io_eprintf (sd, "Missing fill value between 0 and 255\n");

            return SIM_RC_FAIL;

          }

        fill_byte_value = (unsigned8) fill_value;

        fill_byte_flag = 1;

        return SIM_RC_OK;

        break;

      }

    case OPTION_MEMORY_MAPFILE:

      {

        if (mmap_next_fd >= 0)

          {

            sim_io_eprintf (sd, "Duplicate memory-mapfile option\n");

            return SIM_RC_FAIL;

          }

        mmap_next_fd = open (arg, O_RDWR);

        if (mmap_next_fd < 0)

          {

            sim_io_eprintf (sd, "Cannot open file `%s': %s\n",

                            arg, strerror(errno));

            return SIM_RC_FAIL;

          }

        return SIM_RC_OK;

      }

    case OPTION_MEMORY_INFO:

      {

        sim_memopt *entry;

        sim_io_printf (sd, "Memory maps:\n");

        for (entry = STATE_MEMOPT (sd); entry != NULL; entry = entry->next)

          {

            sim_memopt *alias;

            sim_io_printf (sd, " memory");

            if (entry->alias == NULL)

              sim_io_printf (sd, " region ");

            else

              sim_io_printf (sd, " alias ");

            if (entry->space != 0)

              sim_io_printf (sd, "0x%lx:", (long) entry->space);

            sim_io_printf (sd, "0x%08lx", (long) entry->addr);

            if (entry->level != 0)

              sim_io_printf (sd, "@0x%lx", (long) entry->level);

            sim_io_printf (sd, ",0x%lx",

                           (long) entry->nr_bytes);

            if (entry->modulo != 0)

              sim_io_printf (sd, "%%0x%lx", (long) entry->modulo);

            for (alias = entry->alias;

                 alias != NULL;

                 alias = alias->next)

              {

                if (alias->space != 0)

                  sim_io_printf (sd, "0x%lx:", (long) alias->space);

                sim_io_printf (sd, ",0x%08lx", (long) alias->addr);

                if (alias->level != 0)

                  sim_io_printf (sd, "@0x%lx", (long) alias->level);

              }

            sim_io_printf (sd, "\n");

          }

        return SIM_RC_OK;

        break;

      }

    default:

      sim_io_eprintf (sd, "Unknown memory option %d\n", opt);

      return SIM_RC_FAIL;

    }

  return SIM_RC_FAIL;

}

/* "memory" module install handler.

   This is called via sim_module_install to install the "memory" subsystem

   into the simulator.  */

static MODULE_INIT_FN sim_memory_init;

static MODULE_UNINSTALL_FN sim_memory_uninstall;

SIM_RC

sim_memopt_install (SIM_DESC sd)

{

  SIM_ASSERT (STATE_MAGIC (sd) == SIM_MAGIC_NUMBER);

  sim_add_option_table (sd, NULL, memory_options);

  sim_module_add_uninstall_fn (sd, sim_memory_uninstall);

  sim_module_add_init_fn (sd, sim_memory_init);

  return SIM_RC_OK;

}

/* Uninstall the "memory" subsystem from the simulator.  */

static void

sim_memory_uninstall (SIM_DESC sd)

{

  sim_memopt **entry = &STATE_MEMOPT (sd);

  sim_memopt *alias;

  while ((*entry) != NULL)

    {

      /* delete any buffer */

      if ((*entry)->buffer != NULL)

        {

#ifdef HAVE_MUNMAP

          if ((*entry)->munmap_length > 0)

            munmap ((*entry)->buffer, (*entry)->munmap_length);

          else

#endif

            zfree ((*entry)->buffer);

        }

      /* delete it and its aliases */

      alias = *entry;

      /* next victim */

      *entry = (*entry)->next;

      while (alias != NULL)

        {

          sim_memopt *dead = alias;

          alias = alias->alias;

          sim_core_detach (sd, NULL, dead->level, dead->space, dead->addr);

          zfree (dead);

        }

    }

}

static SIM_RC

sim_memory_init (SIM_DESC sd)

{

  /* Reinitialize option modifier flags, in case they were left

     over from a previous sim startup event.  */

  fill_byte_flag = 0;

  mmap_next_fd = -1;

  return SIM_RC_OK;

}