text: /*
   * Win32 virtual memory functions
   *
   * Copyright 1997, 2002 Alexandre Julliard
   *
   * This library is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * This library 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
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with this library; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
   */
  
  #include "config.h"
  #include "wine/port.h"
  
  #include <assert.h>
  #include <errno.h>
  #include <fcntl.h>
  #ifdef HAVE_UNISTD_H
  # include <unistd.h>
  #endif
  #include <stdarg.h>
  #include <stdlib.h>
  #include <stdio.h>
  #include <string.h>
  #include <sys/types.h>
  #ifdef HAVE_SYS_SOCKET_H
  # include <sys/socket.h>
  #endif
  #ifdef HAVE_SYS_STAT_H
  # include <sys/stat.h>
  #endif
  #ifdef HAVE_SYS_MMAN_H
  # include <sys/mman.h>
  #endif
  #ifdef HAVE_SYS_SYSINFO_H
  # include <sys/sysinfo.h>
  #endif
  #ifdef HAVE_VALGRIND_VALGRIND_H
  # include <valgrind/valgrind.h>
  #endif
  
  #ifdef __APPLE__ /* CrossOver Hack #16371 */
  #include <mach-o/dyld.h>
  #endif
  
  #include "ntstatus.h"
  #define WIN32_NO_STATUS
  #define NONAMELESSUNION
  #include "windef.h"
  #include "winternl.h"
  #include "wine/library.h"
  #include "wine/server.h"
  #include "wine/exception.h"
  #define WINE_RBTREE_HOSTADDRSPACE
  #include "wine/rbtree.h"
  #include "wine/debug.h"
  #include "ntdll_misc.h"
  
  WINE_DEFAULT_DEBUG_CHANNEL(virtual);
  WINE_DECLARE_DEBUG_CHANNEL(module);
  
  #ifndef MAP_NORESERVE
  #define MAP_NORESERVE 0
  #endif
  
  /* File view */
  #include "wine/hostptraddrspace_enter.h"
  struct file_view
  {
      struct wine_rb_entry entry;  /* entry in global view tree */
      void * WIN32PTR base;        /* base address */
      size_t        size;          /* size in bytes */
      unsigned int  protect;       /* protection for all pages at allocation time and SEC_* flags */
  };
  #include "wine/hostptraddrspace_exit.h"
  
  /* per-page protection flags */
  #define VPROT_READ       0x01
  #define VPROT_WRITE      0x02
  #define VPROT_EXEC       0x04
  #define VPROT_WRITECOPY  0x08
  #define VPROT_GUARD      0x10
  #define VPROT_COMMITTED  0x20
  #define VPROT_WRITEWATCH 0x40
  /* per-mapping protection flags */
  #define VPROT_SYSTEM     0x0200  /* system view (underlying mmap not under our control) */
  
  /* Conversion from VPROT_* to Win32 flags */
  static const BYTE VIRTUAL_Win32Flags[16] =
  {
      PAGE_NOACCESS,              /* 0 */
      PAGE_READONLY,              /* READ */
      PAGE_READWRITE,             /* WRITE */
      PAGE_READWRITE,             /* READ | WRITE */
      PAGE_EXECUTE,               /* EXEC */
      PAGE_EXECUTE_READ,          /* READ | EXEC */
      PAGE_EXECUTE_READWRITE,     /* WRITE | EXEC */
      PAGE_EXECUTE_READWRITE,     /* READ | WRITE | EXEC */
      PAGE_WRITECOPY,             /* WRITECOPY */
      PAGE_WRITECOPY,             /* READ | WRITECOPY */
      PAGE_WRITECOPY,             /* WRITE | WRITECOPY */
      PAGE_WRITECOPY,             /* READ | WRITE | WRITECOPY */
      PAGE_EXECUTE_WRITECOPY,     /* EXEC | WRITECOPY */
      PAGE_EXECUTE_WRITECOPY,     /* READ | EXEC | WRITECOPY */
      PAGE_EXECUTE_WRITECOPY,     /* WRITE | EXEC | WRITECOPY */
      PAGE_EXECUTE_WRITECOPY      /* READ | WRITE | EXEC | WRITECOPY */
  };
  
  static struct wine_rb_tree views_tree;
  
  static RTL_CRITICAL_SECTION csVirtual;
  static RTL_CRITICAL_SECTION_DEBUG critsect_debug =
  {
      0, 0, &csVirtual,
      { &critsect_debug.ProcessLocksList, &critsect_debug.ProcessLocksList },
        0, 0, { (DWORD_PTR)(__FILE__ ": csVirtual") }
  };
  static RTL_CRITICAL_SECTION csVirtual = { &critsect_debug, -1, 0, 0, 0, 0 };
  
  #if defined(__i386__) || defined(__i386_on_x86_64__)
  static const UINT page_shift = 12;
  static const UINT_PTR page_mask = 0xfff;
  /* Note: these are Windows limits, you cannot change them. */
  static void *address_space_limit = (void *)0xc0000000;  /* top of the total available address space */
  static void *user_space_limit    = (void *)0x7fff0000;  /* top of the user address space */
  static void *working_set_limit   = (void *)0x7fff0000;  /* top of the current working set */
  static void *address_space_start = (void *)0x110000;    /* keep DOS area clear */
  static void * const address_space_hard_limit = (void *)0xffff0000;  /* top of the total available address space */
  #elif defined(__x86_64__)
  static const UINT page_shift = 12;
  static const UINT_PTR page_mask = 0xfff;
  static void *address_space_limit = (void *)0x7fffffff0000;
  static void *user_space_limit    = (void *)0x7fffffff0000;
  static void *working_set_limit   = (void *)0x7fffffff0000;
  static void *address_space_start = (void *)0x10000;
  static void * const address_space_hard_limit = (void *)0xffffffffffff0000;
  #else
  UINT_PTR page_size = 0;
  static UINT page_shift;
  static UINT_PTR page_mask;
  static void *address_space_limit;
  static void *user_space_limit;
  static void *working_set_limit;
  static void *address_space_start = (void *)0x10000;
  #endif  /* __i386__ */
  
  static inline void *ROUND_ADDR(const void *addr, ULONG_HOSTPTR mask)
  {
      return TRUNCCAST(void *, (ULONG_HOSTPTR)addr & ~mask);
  }
  
  #ifdef __i386_on_x86_64__
  static inline void * HOSTPTR ROUND_ADDR(const void * HOSTPTR addr, ULONG_HOSTPTR mask) __attribute__((overloadable))
  {
      return (void * HOSTPTR)((ULONG_HOSTPTR)addr & ~mask);
  }
  #endif
  
  #define ROUND_SIZE(addr,size) \
     (((SIZE_T)(size) + ((UINT_PTR)(addr) & page_mask) + page_mask) & ~page_mask)
  
  #define VIRTUAL_DEBUG_DUMP_VIEW(view) \
      do { if (TRACE_ON(virtual)) VIRTUAL_DumpView(view); } while (0)
  
  #ifdef _WIN64  /* on 64-bit the page protection bytes use a 2-level table */
  static const size_t pages_vprot_shift = 20;
  static const size_t pages_vprot_mask = (1 << 20) - 1;
  static size_t pages_vprot_size;
  static BYTE **pages_vprot;
  #else  /* on 32-bit we use a simple array with one byte per page */
  static BYTE * HOSTPTR pages_vprot;
  #endif
  
  static struct file_view *view_block_start, *view_block_end, *next_free_view;
  static const size_t view_block_size = 0x100000;
  static void *preload_reserve_start;
  static void *preload_reserve_end;
  static BOOL use_locks;
  static BOOL force_exec_prot;  /* whether to force PROT_EXEC on all PROT_READ mmaps */
  
  static inline int is_view_valloc( const struct file_view *view )
  {
      return !(view->protect & (SEC_FILE | SEC_RESERVE | SEC_COMMIT));
  }
  
  /***********************************************************************
   *           get_page_vprot
   *
   * Return the page protection byte.
   */
  static BYTE get_page_vprot( const void *addr )
  {
      size_t idx = (size_t)addr >> page_shift;
  
  #ifdef _WIN64
      if ((idx >> pages_vprot_shift) >= pages_vprot_size) return 0;
      if (!pages_vprot[idx >> pages_vprot_shift]) return 0;
      return pages_vprot[idx >> pages_vprot_shift][idx & pages_vprot_mask];
  #else
      return pages_vprot[idx];
  #endif
  }
  
  
  /***********************************************************************
   *           set_page_vprot
   *
   * Set a range of page protection bytes.
   */
  static void set_page_vprot( const void *addr, size_t size, BYTE vprot )
  {
      size_t idx = (size_t)addr >> page_shift;
      size_t end = ((size_t)addr + size + page_mask) >> page_shift;
  
  #ifdef _WIN64
      while (idx >> pages_vprot_shift != end >> pages_vprot_shift)
      {
          size_t dir_size = pages_vprot_mask + 1 - (idx & pages_vprot_mask);
          memset( pages_vprot[idx >> pages_vprot_shift] + (idx & pages_vprot_mask), vprot, dir_size );
          idx += dir_size;
      }
      memset( pages_vprot[idx >> pages_vprot_shift] + (idx & pages_vprot_mask), vprot, end - idx );
  #else
      memset( pages_vprot + idx, vprot, end - idx );
  #endif
  }
  
  
  /***********************************************************************
   *           set_page_vprot_bits
   *
   * Set or clear bits in a range of page protection bytes.
   */
  static void set_page_vprot_bits( const void *addr, size_t size, BYTE set, BYTE clear )
  {
      size_t idx = (size_t)addr >> page_shift;
      size_t end = ((size_t)addr + size + page_mask) >> page_shift;
  
  #ifdef _WIN64
      for ( ; idx < end; idx++)
      {
          BYTE *ptr = pages_vprot[idx >> pages_vprot_shift] + (idx & pages_vprot_mask);
          *ptr = (*ptr & ~clear) | set;
      }
  #else
      for ( ; idx < end; idx++) pages_vprot[idx] = (pages_vprot[idx] & ~clear) | set;
  #endif
  }
  
  
  /***********************************************************************
   *           alloc_pages_vprot
   *
   * Allocate the page protection bytes for a given range.
   */
  static BOOL alloc_pages_vprot( const void *addr, size_t size )
  {
  #ifdef _WIN64
      size_t idx = (size_t)addr >> page_shift;
      size_t end = ((size_t)addr + size + page_mask) >> page_shift;
      size_t i;
      void *ptr;
  
      assert( end <= pages_vprot_size << pages_vprot_shift );
      for (i = idx >> pages_vprot_shift; i < (end + pages_vprot_mask) >> pages_vprot_shift; i++)
      {
          if (pages_vprot[i]) continue;
          if ((ptr = wine_anon_mmap( NULL, pages_vprot_mask + 1, PROT_READ | PROT_WRITE, 0 )) == MAP_FAILED_HOSTPTR)
              return FALSE;
          pages_vprot[i] = ptr;
      }
  #endif
      return TRUE;
  }
  
  
  /***********************************************************************
   *           compare_view
   *
   * View comparison function used for the rb tree.
   */
  static int compare_view( const void * HOSTPTR addr, const struct wine_rb_entry * HOSTPTR entry )
  {
      struct file_view *view = WINE_RB_ENTRY_VALUE( entry, struct file_view, entry );
  
      if (addr < view->base) return -1;
      if (addr > view->base) return 1;
      return 0;
  }
  
  
  /***********************************************************************
   *           VIRTUAL_GetProtStr
   */
  static const char *VIRTUAL_GetProtStr( BYTE prot )
  {
      static char buffer[6];
      buffer[0] = (prot & VPROT_COMMITTED) ? 'c' : '-';
      buffer[1] = (prot & VPROT_GUARD) ? 'g' : ((prot & VPROT_WRITEWATCH) ? 'H' : '-');
      buffer[2] = (prot & VPROT_READ) ? 'r' : '-';
      buffer[3] = (prot & VPROT_WRITECOPY) ? 'W' : ((prot & VPROT_WRITE) ? 'w' : '-');
      buffer[4] = (prot & VPROT_EXEC) ? 'x' : '-';
      buffer[5] = 0;
      return buffer;
  }
  
  
  /***********************************************************************
   *           VIRTUAL_GetUnixProt
   *
   * Convert page protections to protection for mmap/mprotect.
   */
  static int VIRTUAL_GetUnixProt( BYTE vprot )
  {
      int prot = 0;
      if ((vprot & VPROT_COMMITTED) && !(vprot & VPROT_GUARD))
      {
          if (vprot & VPROT_READ) prot |= PROT_READ;
          if (vprot & VPROT_WRITE) prot |= PROT_WRITE | PROT_READ;
          if (vprot & VPROT_WRITECOPY) prot |= PROT_WRITE | PROT_READ;
          if (vprot & VPROT_EXEC) prot |= PROT_EXEC | PROT_READ;
          if (vprot & VPROT_WRITEWATCH) prot &= ~PROT_WRITE;
      }
      if (!prot) prot = PROT_NONE;
      return prot;
  }
  
  
  /***********************************************************************
   *           VIRTUAL_DumpView
   */
  static void VIRTUAL_DumpView( struct file_view *view )
  {
      UINT i, count;
      char *addr = view->base;
      BYTE prot = get_page_vprot( addr );
  
      TRACE( "View: %p - %p", addr, addr + view->size - 1 );
      if (view->protect & VPROT_SYSTEM)
          TRACE( " (builtin image)\n" );
      else if (view->protect & SEC_IMAGE)
          TRACE( " (image)\n" );
      else if (view->protect & SEC_FILE)
          TRACE( " (file)\n" );
      else if (view->protect & (SEC_RESERVE | SEC_COMMIT))
          TRACE( " (anonymous)\n" );
      else
          TRACE( " (valloc)\n");
  
      for (count = i = 1; i < view->size >> page_shift; i++, count++)
      {
          BYTE next = get_page_vprot( addr + (count << page_shift) );
          if (next == prot) continue;
          TRACE( "      %p - %p %s\n",
                   addr, addr + (count << page_shift) - 1, VIRTUAL_GetProtStr(prot) );
          addr += (count << page_shift);
          prot = next;
          count = 0;
      }
      if (count)
          TRACE( "      %p - %p %s\n",
                   addr, addr + (count << page_shift) - 1, VIRTUAL_GetProtStr(prot) );
  }
  
  
  /***********************************************************************
   *           VIRTUAL_Dump
   */
  #ifdef WINE_VM_DEBUG
  static void VIRTUAL_Dump(void)
  {
      sigset_t sigset;
      struct file_view *view;
  
      TRACE( "Dump of all virtual memory views:\n" );
      server_enter_uninterrupted_section( &csVirtual, &sigset );
      WINE_RB_FOR_EACH_ENTRY( view, &views_tree, struct file_view, entry )
      {
          VIRTUAL_DumpView( view );
      }
      server_leave_uninterrupted_section( &csVirtual, &sigset );
  }
  #endif
  
  
  /***********************************************************************
   *           VIRTUAL_FindView
   *
   * Find the view containing a given address. The csVirtual section must be held by caller.
   *
   * PARAMS
   *      addr  [I] Address
   *
   * RETURNS
   *	View: Success
   *	NULL: Failure
   */
  static struct file_view *VIRTUAL_FindView( const void *addr, size_t size )
  {
      struct wine_rb_entry *ptr = views_tree.root;
  
      if ((const char *)addr + size < (const char *)addr) return NULL; /* overflow */
  
      while (ptr)
      {
          struct file_view *view = WINE_RB_ENTRY_VALUE( ptr, struct file_view, entry );
  
          if (view->base > addr) ptr = ptr->left;
          else if ((const char *)view->base + view->size <= (const char *)addr) ptr = ptr->right;
          else if ((const char *)view->base + view->size < (const char *)addr + size) break;  /* size too large */
          else return view;
      }
      return NULL;
  }
  
  
  /***********************************************************************
   *           get_mask
   */
  static inline UINT_PTR get_mask( ULONG alignment )
  {
      if (alignment < 16) return 0xffff;  /* some apps rely on all allocations being aligned to 64K */
      if (alignment > 21) return 0;
      return (1 << alignment) - 1;
  }
  
  
  /***********************************************************************
   *           is_write_watch_range
   */
  static inline BOOL is_write_watch_range( const void *addr, size_t size )
  {
      struct file_view *view = VIRTUAL_FindView( addr, size );
      return view && (view->protect & VPROT_WRITEWATCH);
  }
  
  
  /***********************************************************************
   *           is_system_range
   */
  static inline BOOL is_system_range( const void *addr, size_t size )
  {
      struct file_view *view = VIRTUAL_FindView( addr, size );
      return view && (view->protect & VPROT_SYSTEM);
  }
  
  
  /***********************************************************************
   *           find_view_range
   *
   * Find the first view overlapping at least part of the specified range.
   * The csVirtual section must be held by caller.
   */
  static struct file_view *find_view_range( const void * HOSTPTR addr, size_t size )
  {
      struct wine_rb_entry *ptr = views_tree.root;
  
      while (ptr)
      {
          struct file_view *view = WINE_RB_ENTRY_VALUE( ptr, struct file_view, entry );
  
          if ((const char *)view->base >= (const char * HOSTPTR)addr + size) ptr = ptr->left;
          else if ((const char *)view->base + view->size <= (const char * HOSTPTR)addr) ptr = ptr->right;
          else return view;
      }
      return NULL;
  }
  
  
  /***********************************************************************
   *           find_free_area
   *
   * Find a free area between views inside the specified range.
   * The csVirtual section must be held by caller.
   */
  static void * HOSTPTR find_free_area( void * HOSTPTR base, void * HOSTPTR end, size_t size, size_t mask, int top_down )
  {
      struct wine_rb_entry *first = NULL, *ptr = views_tree.root;
      void * HOSTPTR start;
  
      /* find the first (resp. last) view inside the range */
      while (ptr)
      {
          struct file_view *view = WINE_RB_ENTRY_VALUE( ptr, struct file_view, entry );
          if ((char *)view->base + view->size >= (char * HOSTPTR)end)
          {
              end = min( end, view->base );
              ptr = ptr->left;
          }
          else if (view->base <= base)
          {
              base = max( (char * HOSTPTR)base, (char *)view->base + view->size );
              ptr = ptr->right;
          }
          else
          {
              first = ptr;
              ptr = top_down ? ptr->right : ptr->left;
          }
      }
  
      if (top_down)
      {
          start = ROUND_ADDR( (char * HOSTPTR )end - size, mask );
          if (start >= end || start < base) return NULL;
  
          while (first)
          {
              struct file_view *view = WINE_RB_ENTRY_VALUE( first, struct file_view, entry );
  
              if ((char *)view->base + view->size <= (char * HOSTPTR)start) break;
              start = ROUND_ADDR( (char *)view->base - size, mask );
              /* stop if remaining space is not large enough */
              if (!start || start >= end || start < base) return NULL;
              first = wine_rb_prev( first );
          }
      }
      else
      {
          start = ROUND_ADDR( (char * HOSTPTR)base + mask, mask );
          if (!start || start >= end || (char * HOSTPTR)end - (char * HOSTPTR)start < size) return NULL;
  
          while (first)
          {
              struct file_view *view = WINE_RB_ENTRY_VALUE( first, struct file_view, entry );
  
              if ((char *)view->base >= (char * HOSTPTR)start + size) break;
              start = ROUND_ADDR( (char *)view->base + view->size + mask, mask );
              /* stop if remaining space is not large enough */
              if (!start || start >= end || (char * HOSTPTR)end - (char * HOSTPTR)start < size) return NULL;
              first = wine_rb_next( first );
          }
      }
      return start;
  }
  
  
  /***********************************************************************
   *           add_reserved_area
   *
   * Add a reserved area to the list maintained by libwine.
   * The csVirtual section must be held by caller.
   */
  static void add_reserved_area( void * HOSTPTR addr, size_t size )
  {
      TRACE( "adding %p-%p\n", addr, (char * HOSTPTR)addr + size );
  
      if (addr < user_space_limit)
      {
          /* unmap the part of the area that is below the limit */
          assert( (char * HOSTPTR)addr + size > (char *)user_space_limit );
          munmap( addr, (char *)user_space_limit - (char * HOSTPTR)addr );
          size -= (char *)user_space_limit - (char * HOSTPTR)addr;
          addr = user_space_limit;
      }
      /* blow away existing mappings */
      wine_anon_mmap( addr, size, PROT_NONE, MAP_NORESERVE | MAP_FIXED );
      wine_mmap_add_reserved_area( addr, size );
  }
  
  
  /***********************************************************************
   *           remove_reserved_area
   *
   * Remove a reserved area from the list maintained by libwine.
   * The csVirtual section must be held by caller.
   */
  static void remove_reserved_area( void * HOSTPTR start, size_t size )
  {
      struct file_view *view;
      char * HOSTPTR addr = start;
  
      TRACE( "removing %p-%p\n", addr, addr + size );
      wine_mmap_remove_reserved_area( addr, size, 0 );
  
      /* unmap areas not covered by an existing view */
      WINE_RB_FOR_EACH_ENTRY( view, &views_tree, struct file_view, entry )
      {
          if ((char *)view->base >= addr + size) break;
          if ((char *)view->base + view->size <= addr) continue;
          if (view->base > (void * HOSTPTR)addr) munmap( addr, (char *)view->base - addr );
          if ((char *)view->base + view->size > addr + size) return;
          size = addr + size - ((char *)view->base + view->size);
          addr = (char *)view->base + view->size;
      }
      munmap( addr, size );
  }
  
  
  struct area_boundary
  {
      void * HOSTPTR base;
      size_t size;
      void * HOSTPTR boundary;
  };
  
  /***********************************************************************
   *           get_area_boundary_callback
   *
   * Get lowest boundary address between reserved area and non-reserved area
   * in the specified region. If no boundaries are found, result is NULL.
   * The csVirtual section must be held by caller.
   */
  static int get_area_boundary_callback( void * HOSTPTR start, size_t size, void * HOSTPTR arg )
  {
      struct area_boundary * HOSTPTR area = arg;
      void * HOSTPTR end = (char * HOSTPTR)start + size;
  
      area->boundary = NULL;
      if (area->base >= end) return 0;
      if ((char * HOSTPTR)start >= (char * HOSTPTR)area->base + area->size) return 1;
      if (area->base >= start)
      {
          if ((char * HOSTPTR)area->base + area->size > (char * HOSTPTR)end)
          {
              area->boundary = end;
              return 1;
          }
          return 0;
      }
      area->boundary = start;
      return 1;
  }
  
  
  /***********************************************************************
   *           is_beyond_limit
   *
   * Check if an address range goes beyond a given limit.
   */
  static inline BOOL is_beyond_limit( const void * HOSTPTR addr, size_t size, const void * HOSTPTR limit )
  {
      return (addr >= limit || (const char * HOSTPTR)addr + size > (const char * HOSTPTR)limit);
  }
  
  
  /***********************************************************************
   *           unmap_area
   *
   * Unmap an area, or simply replace it by an empty mapping if it is
   * in a reserved area. The csVirtual section must be held by caller.
   */
  static inline void unmap_area( void * HOSTPTR addr, size_t size )
  {
      switch (wine_mmap_is_in_reserved_area( addr, size ))
      {
      case -1: /* partially in a reserved area */
      {
          struct area_boundary area;
          size_t lower_size;
          area.base = addr;
          area.size = size;
          wine_mmap_enum_reserved_areas( get_area_boundary_callback, &area, 0 );
          assert( area.boundary );
          lower_size = (char * HOSTPTR)area.boundary - (char * HOSTPTR)addr;
          unmap_area( addr, lower_size );
          unmap_area( area.boundary, size - lower_size );
          break;
      }
      case 1:  /* in a reserved area */
          wine_anon_mmap( addr, size, PROT_NONE, MAP_NORESERVE | MAP_FIXED );
          break;
      default:
      case 0:  /* not in a reserved area */
          if (is_beyond_limit( addr, size, user_space_limit ))
              add_reserved_area( addr, size );
          else
              munmap( addr, size );
          break;
      }
  }
  
  
  struct alloc_area
  {
      size_t size;
      size_t mask;
      int    top_down;
      void * HOSTPTR limit;
      void * HOSTPTR result;
  };
  
  /***********************************************************************
   *           alloc_reserved_area_callback
   *
   * Try to map some space inside a reserved area. Callback for wine_mmap_enum_reserved_areas.
   */
  static int alloc_reserved_area_callback( void * HOSTPTR start, size_t size, void * HOSTPTR arg )
  {
      struct alloc_area * HOSTPTR alloc = arg;
      void * HOSTPTR end = (char * HOSTPTR)start + size;
  
      if (is_beyond_limit( start, size, alloc->limit )) end = alloc->limit;
      if (start < address_space_start) start = address_space_start;
      if (start >= end) return 0;
  
      /* make sure we don't touch the preloader reserved range */
      if (preload_reserve_end >= start)
      {
          if (preload_reserve_end >= end)
          {
              if (preload_reserve_start <= start) return 0;  /* no space in that area */
              if (preload_reserve_start < end) end = preload_reserve_start;
          }
          else if (preload_reserve_start <= start) start = preload_reserve_end;
          else
          {
              /* range is split in two by the preloader reservation, try first part */
              if ((alloc->result = find_free_area( start, preload_reserve_start, alloc->size,
                                                   alloc->mask, alloc->top_down )))
                  return 1;
              /* then fall through to try second part */
              start = preload_reserve_end;
          }
      }
      if ((alloc->result = find_free_area( start, end, alloc->size, alloc->mask, alloc->top_down )))
          return 1;
  
      return 0;
  }
  
  
  /***********************************************************************
   *           alloc_view
   *
   * Allocate a new view. The csVirtual section must be held by caller.
   */
  static struct file_view *alloc_view(void)
  {
      if (next_free_view)
      {
          struct file_view *ret = next_free_view;
          next_free_view = *(struct file_view ** HOSTPTR)ret;
          return ret;
      }
      if (view_block_start == view_block_end)
      {
          void * HOSTPTR ptr = MAP_FAILED_HOSTPTR;
          struct alloc_area alloc;
  
          alloc.size = view_block_size;
          alloc.mask = 0;
          alloc.top_down = TRUE;
          alloc.limit = (void * HOSTPTR)~(ULONG_HOSTPTR)0;
          if (wine_mmap_enum_reserved_areas( alloc_reserved_area_callback, &alloc, TRUE ))
          {
              ptr = wine_anon_mmap( alloc.result, view_block_size, PROT_READ | PROT_WRITE, MAP_FIXED );
              if (ptr == alloc.result)
                  wine_mmap_remove_reserved_area( ptr, view_block_size, 0 );
          }
          if (ptr == MAP_FAILED_HOSTPTR)
              ptr = wine_anon_mmap( NULL, view_block_size, PROT_READ | PROT_WRITE, 0 );
          if (ptr == MAP_FAILED_HOSTPTR) return NULL;
          view_block_start = ptr;
          view_block_end = view_block_start + view_block_size / sizeof(*view_block_start);
      }
      return view_block_start++;
  }
  
  
  /***********************************************************************
   *           delete_view
   *
   * Deletes a view. The csVirtual section must be held by caller.
   */
  static void delete_view( struct file_view *view ) /* [in] View */
  {
      if (!(view->protect & VPROT_SYSTEM)) unmap_area( view->base, view->size );
      set_page_vprot( view->base, view->size, 0 );
      wine_rb_remove( &views_tree, &view->entry );
      *(struct file_view ** HOSTPTR)view = next_free_view;
      next_free_view = view;
  }
  
  
  /***********************************************************************
   *           create_view
   *
   * Create a view. The csVirtual section must be held by caller.
   */
  static NTSTATUS create_view( struct file_view **view_ret, void *base, size_t size, unsigned int vprot )
  {
      struct file_view *view;
      int unix_prot = VIRTUAL_GetUnixProt( vprot );
  
      assert( !((UINT_PTR)base & page_mask) );
      assert( !(size & page_mask) );
  
      /* Check for overlapping views. This can happen if the previous view
       * was a system view that got unmapped behind our back. In that case
       * we recover by simply deleting it. */
  
      while ((view = find_view_range( base, size )))
      {
          TRACE( "overlapping view %p-%p for %p-%p\n",
                 view->base, (char *)view->base + view->size, base, (char *)base + size );
          assert( view->protect & VPROT_SYSTEM );
          delete_view( view );
      }
  
      if (!alloc_pages_vprot( base, size )) return STATUS_NO_MEMORY;
  
      /* Create the view structure */
  
      if (!(view = alloc_view()))
      {
          FIXME( "out of memory for %p-%p\n", base, (char *)base + size );
          return STATUS_NO_MEMORY;
      }
  
      view->base    = base;
      view->size    = size;
      view->protect = vprot;
      set_page_vprot( base, size, vprot );
  
      wine_rb_put( &views_tree, view->base, &view->entry );
  
      *view_ret = view;
  
      if (force_exec_prot && (unix_prot & PROT_READ) && !(unix_prot & PROT_EXEC))
      {
          TRACE( "forcing exec permission on %p-%p\n", base, (char *)base + size - 1 );
          mprotect( base, size, unix_prot | PROT_EXEC );
      }
      return STATUS_SUCCESS;
  }
  
  
  /***********************************************************************
   *           VIRTUAL_GetWin32Prot
   *
   * Convert page protections to Win32 flags.
   */
  static DWORD VIRTUAL_GetWin32Prot( BYTE vprot, unsigned int map_prot )
  {
      DWORD ret = VIRTUAL_Win32Flags[vprot & 0x0f];
      if (vprot & VPROT_GUARD) ret |= PAGE_GUARD;
      if (map_prot & SEC_NOCACHE) ret |= PAGE_NOCACHE;
      return ret;
  }
  
  
  /***********************************************************************
   *           get_vprot_flags
   *
   * Build page protections from Win32 flags.
   *
   * PARAMS
   *      protect [I] Win32 protection flags
   *
   * RETURNS
   *	Value of page protection flags
   */
  static NTSTATUS get_vprot_flags( DWORD protect, unsigned int *vprot, BOOL image )
  {
      switch(protect & 0xff)
      {
      case PAGE_READONLY:
          *vprot = VPROT_READ;
          break;
      case PAGE_READWRITE:
          if (image)
              *vprot = VPROT_READ | VPROT_WRITECOPY;
          else
              *vprot = VPROT_READ | VPROT_WRITE;
          break;
      case PAGE_WRITECOPY:
          *vprot = VPROT_READ | VPROT_WRITECOPY;
          break;
      case PAGE_EXECUTE:
          *vprot = VPROT_EXEC;
          break;
      case PAGE_EXECUTE_READ:
          *vprot = VPROT_EXEC | VPROT_READ;
          break;
      case PAGE_EXECUTE_READWRITE:
          if (image)
              *vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITECOPY;
          else
              *vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE;
          break;
      case PAGE_EXECUTE_WRITECOPY:
          *vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITECOPY;
          break;
      case PAGE_NOACCESS:
          *vprot = 0;
          break;
      default:
          return STATUS_INVALID_PAGE_PROTECTION;
      }
      if (protect & PAGE_GUARD) *vprot |= VPROT_GUARD;
      return STATUS_SUCCESS;
  }
  
  
  /***********************************************************************
   *           mprotect_exec
   *
   * Wrapper for mprotect, adds PROT_EXEC if forced by force_exec_prot
   */
  static inline int mprotect_exec( void *base, size_t size, int unix_prot )
  {
      if (force_exec_prot && (unix_prot & PROT_READ) && !(unix_prot & PROT_EXEC))
      {
          TRACE( "forcing exec permission on %p-%p\n", base, (char *)base + size - 1 );
          if (!mprotect( base, size, unix_prot | PROT_EXEC )) return 0;
          /* exec + write may legitimately fail, in that case fall back to write only */
          if (!(unix_prot & PROT_WRITE)) return -1;
      }
  
      return mprotect( base, size, unix_prot );
  }
  
  
  /***********************************************************************
   *           mprotect_range
   *
   * Call mprotect on a page range, applying the protections from the per-page byte.
   */
  static void mprotect_range( void *base, size_t size, BYTE set, BYTE clear )
  {
      size_t i, count;
      char *addr = ROUND_ADDR( base, page_mask );
      int prot, next;
  
      size = ROUND_SIZE( base, size );
      prot = VIRTUAL_GetUnixProt( (get_page_vprot( addr ) & ~clear ) | set );
      for (count = i = 1; i < size >> page_shift; i++, count++)
      {
          next = VIRTUAL_GetUnixProt( (get_page_vprot( addr + (count << page_shift) ) & ~clear) | set );
          if (next == prot) continue;
          mprotect_exec( addr, count << page_shift, prot );
          addr += count << page_shift;
          prot = next;
          count = 0;
      }
      if (count) mprotect_exec( addr, count << page_shift, prot );
  }
  
  
  /***********************************************************************
   *           VIRTUAL_SetProt
   *
   * Change the protection of a range of pages.
   *
   * RETURNS
   *	TRUE: Success
   *	FALSE: Failure
   */
  static BOOL VIRTUAL_SetProt( struct file_view *view, /* [in] Pointer to view */
                               void *base,      /* [in] Starting address */
                               size_t size,     /* [in] Size in bytes */
                               BYTE vprot )     /* [in] Protections to use */
  {
      int unix_prot = VIRTUAL_GetUnixProt(vprot);
  
      if (view->protect & VPROT_WRITEWATCH)
      {
          /* each page may need different protections depending on write watch flag */
          set_page_vprot_bits( base, size, vprot & ~VPROT_WRITEWATCH, ~vprot & ~VPROT_WRITEWATCH );
          mprotect_range( base, size, 0, 0 );
          return TRUE;
      }
  
      /* if setting stack guard pages, store the permissions first, as the guard may be
       * triggered at any point after mprotect and change the permissions again */
      if ((vprot & VPROT_GUARD) &&
          (base >= NtCurrentTeb()->DeallocationStack) &&
          (base < NtCurrentTeb()->Tib.StackBase))
      {
          set_page_vprot( base, size, vprot );
          mprotect( base, size, unix_prot );
          return TRUE;
      }
  
      if (mprotect_exec( base, size, unix_prot )) /* FIXME: last error */
          return FALSE;
  
      set_page_vprot( base, size, vprot );
      return TRUE;
  }
  
  
  /***********************************************************************
   *           set_protection
   *
   * Set page protections on a range of pages
   */
  static NTSTATUS set_protection( struct file_view *view, void *base, SIZE_T size, ULONG protect )
  {
      unsigned int vprot;
      NTSTATUS status;
  
      if ((status = get_vprot_flags( protect, &vprot, view->protect & SEC_IMAGE ))) return status;
      if (is_view_valloc( view ))
      {
          if (vprot & VPROT_WRITECOPY) return STATUS_INVALID_PAGE_PROTECTION;
      }
      else
      {
          BYTE access = vprot & (VPROT_READ | VPROT_WRITE | VPROT_EXEC);
          if ((view->protect & access) != access) return STATUS_INVALID_PAGE_PROTECTION;
      }
  
      if (!VIRTUAL_SetProt( view, base, size, vprot | VPROT_COMMITTED )) return STATUS_ACCESS_DENIED;
      return STATUS_SUCCESS;
  }
  
  
  /***********************************************************************
   *           update_write_watches
   */
  static void update_write_watches( void *base, size_t size, size_t accessed_size )
  {
      TRACE( "updating watch %p-%p-%p\n", base, (char *)base + accessed_size, (char *)base + size );
      /* clear write watch flag on accessed pages */
      set_page_vprot_bits( base, accessed_size, 0, VPROT_WRITEWATCH );
      /* restore page protections on the entire range */
      mprotect_range( base, size, 0, 0 );
  }
  
  
  /***********************************************************************
   *           reset_write_watches
   *
   * Reset write watches in a memory range.
   */
  static void reset_write_watches( void *base, SIZE_T size )
  {
      set_page_vprot_bits( base, size, VPROT_WRITEWATCH, 0 );
      mprotect_range( base, size, 0, 0 );
  }
  
  
  /***********************************************************************
   *           unmap_extra_space
   *
   * Release the extra memory while keeping the range starting on the granularity boundary.
   */
  static inline void * HOSTPTR unmap_extra_space( void * HOSTPTR ptr, size_t total_size, size_t wanted_size, size_t mask )
  {
      if ((ULONG_HOSTPTR)ptr & mask)
      {
          size_t extra = mask + 1 - ((ULONG_HOSTPTR)ptr & mask);
          munmap( ptr, extra );
          ptr = (char * HOSTPTR)ptr + extra;
          total_size -= extra;
      }
      if (total_size > wanted_size)
          munmap( (char * HOSTPTR)ptr + wanted_size, total_size - wanted_size );
      return ptr;
  }
  
  
  /***********************************************************************
   *           map_fixed_area
   *
   * mmap the fixed memory area.
   * The csVirtual section must be held by caller.
   */
  static NTSTATUS map_fixed_area( void * HOSTPTR base, size_t size, unsigned int vprot )
  {
      void * HOSTPTR ptr;
  
      switch (wine_mmap_is_in_reserved_area( base, size ))
      {
      case -1: /* partially in a reserved area */
      {
          NTSTATUS status;
          struct area_boundary area;
          size_t lower_size;
          area.base = base;
          area.size = size;
          wine_mmap_enum_reserved_areas( get_area_boundary_callback, &area, 0 );
          assert( area.boundary );
          lower_size = (char * HOSTPTR)area.boundary - (char * HOSTPTR)base;
          status = map_fixed_area( base, lower_size, vprot );
          if (status == STATUS_SUCCESS)
          {
              status = map_fixed_area( area.boundary, size - lower_size, vprot);
              if (status != STATUS_SUCCESS) unmap_area( base, lower_size );
          }
          return status;
      }
      case 0:  /* not in a reserved area, do a normal allocation */
          if ((ptr = wine_anon_mmap( base, size, VIRTUAL_GetUnixProt(vprot), 0 )) == MAP_FAILED_HOSTPTR)
          {
              if (errno == ENOMEM) return STATUS_NO_MEMORY;
              return STATUS_INVALID_PARAMETER;
          }
          if (ptr != base)
          {
              /* We couldn't get the address we wanted */
              if (is_beyond_limit( ptr, size, user_space_limit )) add_reserved_area( ptr, size );
              else munmap( ptr, size );
              return STATUS_CONFLICTING_ADDRESSES;
          }
          break;
  
      default:
      case 1:  /* in a reserved area, make sure the address is available */
          if (find_view_range( base, size )) return STATUS_CONFLICTING_ADDRESSES;
          /* replace the reserved area by our mapping */
          if ((ptr = wine_anon_mmap( base, size, VIRTUAL_GetUnixProt(vprot), MAP_FIXED )) != base)
              return STATUS_INVALID_PARAMETER;
          break;
      }
      if (is_beyond_limit( ptr, size, working_set_limit )) working_set_limit = address_space_limit;
      return STATUS_SUCCESS;
  }
  
  /***********************************************************************
   *           map_view
   *
   * Create a view and mmap the corresponding memory area.
   * The csVirtual section must be held by caller.
   */
  static NTSTATUS map_view( struct file_view **view_ret, void *base, size_t size, size_t alignment,
                            int top_down, unsigned int vprot, size_t zero_bits )
  {
      void * HOSTPTR ptr;
      NTSTATUS status;
      size_t mask = get_mask( alignment );
  
      if (base)
      {
          if (is_beyond_limit( base, size, address_space_limit ))
              return STATUS_WORKING_SET_LIMIT_RANGE;
          status = map_fixed_area( base, size, vprot );
          if (status != STATUS_SUCCESS) return status;
          ptr = base;
      }
      else
      {
          size_t view_size = size + mask + 1;
          struct alloc_area alloc;
  
          if (zero_bits)
              FIXME("Unimplemented zero_bits parameter value\n");
  
          alloc.size = size;
          alloc.mask = mask;
          alloc.top_down = top_down;
          alloc.limit = user_space_limit;
          if (wine_mmap_enum_reserved_areas( alloc_reserved_area_callback, &alloc, top_down ))
          {
              ptr = alloc.result;
              TRACE( "got mem in reserved area %p-%p\n", ptr, (char * HOSTPTR)ptr + size );
              if (wine_anon_mmap( ptr, size, VIRTUAL_GetUnixProt(vprot), MAP_FIXED ) != ptr)
                  return STATUS_INVALID_PARAMETER;
              goto done;
          }
  
          for (;;)
          {
              if ((ptr = wine_anon_mmap( NULL, view_size, VIRTUAL_GetUnixProt(vprot), 0 )) == MAP_FAILED_HOSTPTR)
              {
                  if (errno == ENOMEM) return STATUS_NO_MEMORY;
                  return STATUS_INVALID_PARAMETER;
              }
              TRACE( "got mem with anon mmap %p-%p\n", ptr, (char * HOSTPTR)ptr + size );
              /* if we got something beyond the user limit, unmap it and retry */
              if (is_beyond_limit( ptr, view_size, user_space_limit )) add_reserved_area( ptr, view_size );
              else break;
          }
          ptr = unmap_extra_space( ptr, view_size, size, mask );
      }
  done:
      status = create_view( view_ret, ADDRSPACECAST(void *, ptr), size, vprot );
      if (status != STATUS_SUCCESS) unmap_area( ptr, size );
      return status;
  }
  
  
  /***********************************************************************
   *           map_file_into_view
   *
   * Wrapper for mmap() to map a file into a view, falling back to read if mmap fails.
   * The csVirtual section must be held by caller.
   */
  static NTSTATUS map_file_into_view( struct file_view *view, int fd, size_t start, size_t size,
                                      off_t offset, unsigned int vprot, BOOL removable )
  {
      void * HOSTPTR ptr;
      int prot = VIRTUAL_GetUnixProt( vprot | VPROT_COMMITTED /* make sure it is accessible */ );
      unsigned int flags = MAP_FIXED | ((vprot & VPROT_WRITECOPY) ? MAP_PRIVATE : MAP_SHARED);
  
      assert( start < view->size );
      assert( start + size <= view->size );
  
      if (force_exec_prot && (vprot & VPROT_READ))
      {
          TRACE( "forcing exec permission on mapping %p-%p\n",
                 (char *)view->base + start, (char *)view->base + start + size - 1 );
          prot |= PROT_EXEC;
      }
  
      /* only try mmap if media is not removable (or if we require write access) */
      if (!removable || (flags & MAP_SHARED))
      {
  try_again:
          if (mmap( (char *)view->base + start, size, prot, flags, fd, offset ) != MAP_FAILED_HOSTPTR)
              goto done;
  
          switch (errno)
          {
          case EINVAL:  /* file offset is not page-aligned, fall back to read() */
              if (flags & MAP_SHARED) return STATUS_INVALID_PARAMETER;
              break;
          case ENOEXEC:
          case ENODEV:  /* filesystem doesn't support mmap(), fall back to read() */
              if (vprot & VPROT_WRITE)
              {
                  ERR( "shared writable mmap not supported, broken filesystem?\n" );
                  return STATUS_NOT_SUPPORTED;
              }
              break;
          case EACCES:
          case EPERM:  /* noexec filesystem, fall back to read() */
              if (flags & MAP_SHARED)
              {
                  if (prot & PROT_EXEC)
                  {
                      if (force_exec_prot && (vprot & (VPROT_WRITE|VPROT_EXEC)) == VPROT_WRITE)
                      {
                          /* exec + write may legitimately fail, in that case fall back to write only */
                          prot &= ~PROT_EXEC;
                          goto try_again;
                      }
                      ERR( "failed to set PROT_EXEC on file map, noexec filesystem?\n" );
                  }
                  return STATUS_ACCESS_DENIED;
              }
              if (prot & PROT_EXEC) WARN( "failed to set PROT_EXEC on file map, noexec filesystem?\n" );
              break;
          default:
              return FILE_GetNtStatus();
          }
      }
  
      /* Reserve the memory with an anonymous mmap */
      ptr = wine_anon_mmap( (char *)view->base + start, size, PROT_READ | PROT_WRITE, MAP_FIXED );
      if (ptr == MAP_FAILED_HOSTPTR) return FILE_GetNtStatus();
      /* Now read in the file */
      pread( fd, ptr, size, offset );
      if (prot != (PROT_READ|PROT_WRITE)) mprotect( ptr, size, prot );  /* Set the right protection */
  done:
      set_page_vprot( (char *)view->base + start, size, vprot );
      return STATUS_SUCCESS;
  }
  
  
  /***********************************************************************
   *           get_committed_size
   *
   * Get the size of the committed range starting at base.
   * Also return the protections for the first page.
   */
  static SIZE_T get_committed_size( struct file_view *view, void *base, BYTE *vprot )
  {
      SIZE_T i, start;
  
      start = ((char *)base - (char *)view->base) >> page_shift;
      *vprot = get_page_vprot( base );
  
      if (view->protect & SEC_RESERVE)
      {
          SIZE_T ret = 0;
          SERVER_START_REQ( get_mapping_committed_range )
          {
              req->base   = wine_server_client_ptr( view->base );
              req->offset = start << page_shift;
              if (!wine_server_call( req ))
              {
                  ret = reply->size;
                  if (reply->committed)
                  {
                      *vprot |= VPROT_COMMITTED;
                      set_page_vprot_bits( base, ret, VPROT_COMMITTED, 0 );
                  }
              }
          }
          SERVER_END_REQ;
          return ret;
      }
      for (i = start + 1; i < view->size >> page_shift; i++)
          if ((*vprot ^ get_page_vprot( (char *)view->base + (i << page_shift) )) & VPROT_COMMITTED) break;
      return (i - start) << page_shift;
  }
  
  
  /***********************************************************************
   *           decommit_view
   *
   * Decommit some pages of a given view.
   * The csVirtual section must be held by caller.
   */
  static NTSTATUS decommit_pages( struct file_view *view, size_t start, size_t size )
  {
      if (wine_anon_mmap( (char *)view->base + start, size, PROT_NONE, MAP_FIXED ) != MAP_FAILED_HOSTPTR)
      {
          set_page_vprot_bits( (char *)view->base + start, size, 0, VPROT_COMMITTED );
          return STATUS_SUCCESS;
      }
      return FILE_GetNtStatus();
  }
  
  
  /***********************************************************************
   *           allocate_dos_memory
   *
   * Allocate the DOS memory range.
   */
  static NTSTATUS allocate_dos_memory( struct file_view **view, unsigned int vprot )
  {
      size_t size;
      void * HOSTPTR addr = NULL;
      void * const low_64k = (void *)0x10000;
      const SIZE_T dosmem_size = 0x110000;
      int unix_prot = VIRTUAL_GetUnixProt( vprot );
  
      /* check for existing view */
  
      if (find_view_range( 0, dosmem_size )) return STATUS_CONFLICTING_ADDRESSES;
  
      /* check without the first 64K */
  
      if (wine_mmap_is_in_reserved_area( low_64k, dosmem_size - 0x10000 ) != 1)
      {
          addr = wine_anon_mmap( low_64k, dosmem_size - 0x10000, unix_prot, 0 );
          if (addr != low_64k)
          {
              if (addr != MAP_FAILED_HOSTPTR) munmap( addr, dosmem_size - 0x10000 );
              return map_view( view, NULL, dosmem_size, 0, FALSE, vprot, 0 );
          }
      }
  
      /* now try to allocate the low 64K too */
  
      if (wine_mmap_is_in_reserved_area( NULL, 0x10000 ) != 1)
      {
          addr = wine_anon_mmap( (void *)page_size, 0x10000 - page_size, unix_prot, 0 );
          if (addr == (void *)page_size)
          {
              if (!wine_anon_mmap( NULL, page_size, unix_prot, MAP_FIXED ))
              {
                  addr = NULL;
                  TRACE( "successfully mapped low 64K range\n" );
              }
              else TRACE( "failed to map page 0\n" );
          }
          else
          {
              if (addr != MAP_FAILED_HOSTPTR) munmap( addr, 0x10000 - page_size );
              addr = low_64k;
              TRACE( "failed to map low 64K range\n" );
          }
      }
  
      /* now reserve the whole range */
  
      size = (char *)dosmem_size - (char * HOSTPTR)addr;
      wine_anon_mmap( addr, size, unix_prot, MAP_FIXED );
      return create_view( view, ADDRSPACECAST(void *, addr), size, vprot );
  }
  
  
  /***********************************************************************
   *           map_pe_header
   *
   * Map the header of a PE file into memory.
   */
  static NTSTATUS map_pe_header( void *ptr, size_t size, int fd, BOOL *removable )
  {
      if (!size) return STATUS_INVALID_IMAGE_FORMAT;
  
      if (!*removable)
      {
          if (mmap( ptr, size, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_FIXED|MAP_PRIVATE, fd, 0 ) != MAP_FAILED_HOSTPTR)
              return STATUS_SUCCESS;
  
          switch (errno)
          {
          case EPERM:
          case EACCES:
              WARN( "noexec file system, falling back to read\n" );
              break;
          case ENOEXEC:
          case ENODEV:
              WARN( "file system doesn't support mmap, falling back to read\n" );
              break;
          default:
              return FILE_GetNtStatus();
          }
          *removable = TRUE;
      }
      pread( fd, ptr, size, 0 );
      return STATUS_SUCCESS;  /* page protections will be updated later */
  }
  
  
  /***********************************************************************
   *           map_image
   *
   * Map an executable (PE format) image into memory.
   */
  static NTSTATUS map_image( HANDLE hmapping, ACCESS_MASK access, int fd, SIZE_T zero_bits,
                             pe_image_info_t *image_info, int shared_fd, BOOL removable, PVOID *addr_ptr )
  {
      IMAGE_DOS_HEADER *dos;
      IMAGE_NT_HEADERS *nt;
      IMAGE_SECTION_HEADER sections[96];
      IMAGE_SECTION_HEADER *sec;
      IMAGE_DATA_DIRECTORY *imports;
      NTSTATUS status = STATUS_CONFLICTING_ADDRESSES;
      SIZE_T header_size, total_size = image_info->map_size;
      int i;
      off_t pos;
      sigset_t sigset;
      struct stat st;
      struct file_view *view = NULL;
      char *ptr, *header_end, *header_start;
      char *base = wine_server_get_ptr( image_info->base );
  
      if (total_size != image_info->map_size)  /* truncated */
      {
          WARN( "Modules larger than 4Gb (%s) not supported\n", wine_dbgstr_longlong(image_info->map_size) );
          return STATUS_INVALID_PARAMETER;
      }
      if ((ULONG_PTR)base != image_info->base) base = NULL;
  
      /* zero-map the whole range */
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
  
      if (base >= (char *)address_space_start)  /* make sure the DOS area remains free */
          status = map_view( &view, base, total_size, 0, FALSE, SEC_IMAGE | SEC_FILE |
                             VPROT_COMMITTED | VPROT_READ | VPROT_EXEC | VPROT_WRITECOPY, zero_bits );
  
      if (status != STATUS_SUCCESS)
          status = map_view( &view, NULL, total_size, 0, FALSE, SEC_IMAGE | SEC_FILE |
                             VPROT_COMMITTED | VPROT_READ | VPROT_EXEC | VPROT_WRITECOPY, zero_bits );
  
      if (status != STATUS_SUCCESS) goto error;
  
      ptr = view->base;
      TRACE_(module)( "mapped PE file at %p-%p\n", ptr, ptr + total_size );
  
      /* map the header */
  
      if (fstat( fd, &st ) == -1)
      {
          status = FILE_GetNtStatus();
          goto error;
      }
      header_size = min( image_info->header_size, st.st_size );
      if ((status = map_pe_header( view->base, header_size, fd, &removable )) != STATUS_SUCCESS) goto error;
  
      status = STATUS_INVALID_IMAGE_FORMAT;  /* generic error */
      dos = (IMAGE_DOS_HEADER *)ptr;
      nt = (IMAGE_NT_HEADERS *)(ptr + dos->e_lfanew);
      header_end = ptr + ROUND_SIZE( 0, header_size );
      memset( ptr + header_size, 0, header_end - (ptr + header_size) );
      if ((char *)(nt + 1) > header_end) goto error;
      header_start = (char*)&nt->OptionalHeader+nt->FileHeader.SizeOfOptionalHeader;
      if (nt->FileHeader.NumberOfSections > ARRAY_SIZE( sections )) goto error;
      if (header_start + sizeof(*sections) * nt->FileHeader.NumberOfSections > header_end) goto error;
      /* Some applications (e.g. the Steam version of Borderlands) map over the top of the section headers,
       * copying the headers into local memory is necessary to properly load such applications. */
      memcpy(sections, header_start, sizeof(*sections) * nt->FileHeader.NumberOfSections);
      sec = sections;
  
      imports = nt->OptionalHeader.DataDirectory + IMAGE_DIRECTORY_ENTRY_IMPORT;
      if (!imports->Size || !imports->VirtualAddress) imports = NULL;
  
      /* check for non page-aligned binary */
  
      if (image_info->image_flags & IMAGE_FLAGS_ImageMappedFlat)
      {
          /* unaligned sections, this happens for native subsystem binaries */
          /* in that case Windows simply maps in the whole file */
  
          if (map_file_into_view( view, fd, 0, total_size, 0, VPROT_COMMITTED | VPROT_READ | VPROT_WRITECOPY,
                                  removable ) != STATUS_SUCCESS) goto error;
  
          /* check that all sections are loaded at the right offset */
          if (nt->OptionalHeader.FileAlignment != nt->OptionalHeader.SectionAlignment) goto error;
          for (i = 0; i < nt->FileHeader.NumberOfSections; i++)
          {
              if (sec[i].VirtualAddress != sec[i].PointerToRawData)
                  goto error;  /* Windows refuses to load in that case too */
          }
  
          /* set the image protections */
          VIRTUAL_SetProt( view, ptr, total_size,
                           VPROT_COMMITTED | VPROT_READ | VPROT_WRITECOPY | VPROT_EXEC );
  
          /* no relocations are performed on non page-aligned binaries */
          goto done;
      }
  
  
      /* map all the sections */
  
      for (i = pos = 0; i < nt->FileHeader.NumberOfSections; i++, sec++)
      {
          static const SIZE_T sector_align = 0x1ff;
          SIZE_T map_size, file_start, file_size, end;
  
          if (!sec->Misc.VirtualSize)
              map_size = ROUND_SIZE( 0, sec->SizeOfRawData );
          else
              map_size = ROUND_SIZE( 0, sec->Misc.VirtualSize );
  
          /* file positions are rounded to sector boundaries regardless of OptionalHeader.FileAlignment */
          file_start = sec->PointerToRawData & ~sector_align;
          file_size = (sec->SizeOfRawData + (sec->PointerToRawData & sector_align) + sector_align) & ~sector_align;
          if (file_size > map_size) file_size = map_size;
  
          /* a few sanity checks */
          end = sec->VirtualAddress + ROUND_SIZE( sec->VirtualAddress, map_size );
          if (sec->VirtualAddress > total_size || end > total_size || end < sec->VirtualAddress)
          {
              WARN_(module)( "Section %.8s too large (%x+%lx/%lx)\n",
                             sec->Name, sec->VirtualAddress, map_size, total_size );
              goto error;
          }
  
          if ((sec->Characteristics & IMAGE_SCN_MEM_SHARED) &&
              (sec->Characteristics & IMAGE_SCN_MEM_WRITE))
          {
              TRACE_(module)( "mapping shared section %.8s at %p off %x (%x) size %lx (%lx) flags %x\n",
                              sec->Name, ptr + sec->VirtualAddress,
                              sec->PointerToRawData, (int)pos, file_size, map_size,
                              sec->Characteristics );
              if (map_file_into_view( view, shared_fd, sec->VirtualAddress, map_size, pos,
                                      VPROT_COMMITTED | VPROT_READ | VPROT_WRITE, FALSE ) != STATUS_SUCCESS)
              {
                  ERR_(module)( "Could not map shared section %.8s\n", sec->Name );
                  goto error;
              }
  
              /* check if the import directory falls inside this section */
              if (imports && imports->VirtualAddress >= sec->VirtualAddress &&
                  imports->VirtualAddress < sec->VirtualAddress + map_size)
              {
                  UINT_PTR base = imports->VirtualAddress & ~page_mask;
                  UINT_PTR end = base + ROUND_SIZE( imports->VirtualAddress, imports->Size );
                  if (end > sec->VirtualAddress + map_size) end = sec->VirtualAddress + map_size;
                  if (end > base)
                      map_file_into_view( view, shared_fd, base, end - base,
                                          pos + (base - sec->VirtualAddress),
                                          VPROT_COMMITTED | VPROT_READ | VPROT_WRITECOPY, FALSE );
              }
              pos += map_size;
              continue;
          }
  
          TRACE_(module)( "mapping section %.8s at %p off %x size %x virt %x flags %x\n",
                          sec->Name, ptr + sec->VirtualAddress,
                          sec->PointerToRawData, sec->SizeOfRawData,
                          sec->Misc.VirtualSize, sec->Characteristics );
  
          if (!sec->PointerToRawData || !file_size) continue;
  
          /* Note: if the section is not aligned properly map_file_into_view will magically
           *       fall back to read(), so we don't need to check anything here.
           */
          end = file_start + file_size;
          if (sec->PointerToRawData >= st.st_size ||
              end > ((st.st_size + sector_align) & ~sector_align) ||
              end < file_start ||
              map_file_into_view( view, fd, sec->VirtualAddress, file_size, file_start,
                                  VPROT_COMMITTED | VPROT_READ | VPROT_WRITECOPY,
                                  removable ) != STATUS_SUCCESS)
          {
              ERR_(module)( "Could not map section %.8s, file probably truncated\n", sec->Name );
              goto error;
          }
  
          if (file_size & page_mask)
          {
              end = ROUND_SIZE( 0, file_size );
              if (end > map_size) end = map_size;
              TRACE_(module)("clearing %p - %p\n",
                             ptr + sec->VirtualAddress + file_size,
                             ptr + sec->VirtualAddress + end );
              memset( ptr + sec->VirtualAddress + file_size, 0, end - file_size );
          }
      }
  
      /* set the image protections */
  
      VIRTUAL_SetProt( view, ptr, ROUND_SIZE( 0, header_size ), VPROT_COMMITTED | VPROT_READ );
  
      sec = sections;
      for (i = 0; i < nt->FileHeader.NumberOfSections; i++, sec++)
      {
          SIZE_T size;
          BYTE vprot = VPROT_COMMITTED;
  
          if (sec->Misc.VirtualSize)
              size = ROUND_SIZE( sec->VirtualAddress, sec->Misc.VirtualSize );
          else
              size = ROUND_SIZE( sec->VirtualAddress, sec->SizeOfRawData );
  
          if (sec->Characteristics & IMAGE_SCN_MEM_READ)    vprot |= VPROT_READ;
          if (sec->Characteristics & IMAGE_SCN_MEM_WRITE)   vprot |= VPROT_WRITECOPY;
          if (sec->Characteristics & IMAGE_SCN_MEM_EXECUTE) vprot |= VPROT_EXEC;
  
          /* Dumb game crack lets the AOEP point into a data section. Adjust. */
          if ((nt->OptionalHeader.AddressOfEntryPoint >= sec->VirtualAddress) &&
              (nt->OptionalHeader.AddressOfEntryPoint < sec->VirtualAddress + size))
              vprot |= VPROT_EXEC;
  
          if (!VIRTUAL_SetProt( view, ptr + sec->VirtualAddress, size, vprot ) && (vprot & VPROT_EXEC))
              ERR( "failed to set %08x protection on section %.8s, noexec filesystem?\n",
                   sec->Characteristics, sec->Name );
      }
  
   done:
  
      SERVER_START_REQ( map_view )
      {
          req->mapping = wine_server_obj_handle( hmapping );
          req->access  = access;
          req->base    = wine_server_client_ptr( view->base );
          req->size    = view->size;
          req->start   = 0;
          status = wine_server_call( req );
      }
      SERVER_END_REQ;
      if (status) goto error;
  
      VIRTUAL_DEBUG_DUMP_VIEW( view );
      server_leave_uninterrupted_section( &csVirtual, &sigset );
  
      *addr_ptr = ptr;
  #ifdef VALGRIND_LOAD_PDB_DEBUGINFO
      VALGRIND_LOAD_PDB_DEBUGINFO(fd, ptr, total_size, ptr - base);
  #endif
      if (ptr != base) return STATUS_IMAGE_NOT_AT_BASE;
      return STATUS_SUCCESS;
  
   error:
      if (view) delete_view( view );
      server_leave_uninterrupted_section( &csVirtual, &sigset );
      return status;
  }
  
  
  /***********************************************************************
   *             virtual_map_section
   *
   * Map a file section into memory.
   */
  NTSTATUS virtual_map_section( HANDLE handle, PVOID *addr_ptr, ULONG zero_bits, SIZE_T commit_size,
                                const LARGE_INTEGER *offset_ptr, SIZE_T *size_ptr, ULONG protect,
                                pe_image_info_t *image_info )
  {
      NTSTATUS res;
      mem_size_t full_size;
      ACCESS_MASK access;
      SIZE_T size;
      int unix_handle = -1, needs_close;
      unsigned int vprot, sec_flags;
      struct file_view *view;
      HANDLE shared_file;
      LARGE_INTEGER offset;
      sigset_t sigset;
  
      offset.QuadPart = offset_ptr ? offset_ptr->QuadPart : 0;
  
      switch(protect)
      {
      case PAGE_NOACCESS:
      case PAGE_READONLY:
      case PAGE_WRITECOPY:
          access = SECTION_MAP_READ;
          break;
      case PAGE_READWRITE:
          access = SECTION_MAP_WRITE;
          break;
      case PAGE_EXECUTE:
      case PAGE_EXECUTE_READ:
      case PAGE_EXECUTE_WRITECOPY:
          access = SECTION_MAP_READ | SECTION_MAP_EXECUTE;
          break;
      case PAGE_EXECUTE_READWRITE:
          access = SECTION_MAP_WRITE | SECTION_MAP_EXECUTE;
          break;
      default:
          return STATUS_INVALID_PAGE_PROTECTION;
      }
  
      SERVER_START_REQ( get_mapping_info )
      {
          req->handle = wine_server_obj_handle( handle );
          req->access = access;
          wine_server_set_reply( req, image_info, sizeof(*image_info) );
          res = wine_server_call( req );
          sec_flags   = reply->flags;
          full_size   = reply->size;
          shared_file = wine_server_ptr_handle( reply->shared_file );
      }
      SERVER_END_REQ;
      if (res) return res;
  
      if ((res = server_get_unix_fd( handle, 0, &unix_handle, &needs_close, NULL, NULL ))) goto done;
  
      if (sec_flags & SEC_IMAGE)
      {
          if (shared_file)
          {
              int shared_fd, shared_needs_close;
  
              if ((res = server_get_unix_fd( shared_file, FILE_READ_DATA|FILE_WRITE_DATA,
                                             &shared_fd, &shared_needs_close, NULL, NULL ))) goto done;
              res = map_image( handle, access, unix_handle, zero_bits, image_info,
                               shared_fd, needs_close, addr_ptr );
              if (shared_needs_close) close( shared_fd );
              close_handle( shared_file );
          }
          else
          {
              res = map_image( handle, access, unix_handle, zero_bits, image_info,
                               -1, needs_close, addr_ptr );
          }
          if (needs_close) close( unix_handle );
          if (res >= 0) *size_ptr = image_info->map_size;
          return res;
      }
  
      res = STATUS_INVALID_PARAMETER;
      if (offset.QuadPart >= full_size) goto done;
      if (*size_ptr)
      {
          size = *size_ptr;
          if (size > full_size - offset.QuadPart)
          {
              res = STATUS_INVALID_VIEW_SIZE;
              goto done;
          }
      }
      else
      {
          size = full_size - offset.QuadPart;
          if (size != full_size - offset.QuadPart)  /* truncated */
          {
              WARN( "Files larger than 4Gb (%s) not supported on this platform\n",
                    wine_dbgstr_longlong(full_size) );
              goto done;
          }
      }
      if (!(size = ROUND_SIZE( 0, size ))) goto done;  /* wrap-around */
  
      /* Reserve a properly aligned area */
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
  
      get_vprot_flags( protect, &vprot, sec_flags & SEC_IMAGE );
      vprot |= sec_flags;
      if (!(sec_flags & SEC_RESERVE)) vprot |= VPROT_COMMITTED;
      res = map_view( &view, *addr_ptr, size, 0, FALSE, vprot, zero_bits );
      if (res)
      {
          server_leave_uninterrupted_section( &csVirtual, &sigset );
          goto done;
      }
  
      /* Map the file */
  
      TRACE( "handle=%p size=%lx offset=%x%08x\n", handle, size, offset.u.HighPart, offset.u.LowPart );
  
      res = map_file_into_view( view, unix_handle, 0, size, offset.QuadPart, vprot, needs_close );
      if (res == STATUS_SUCCESS)
      {
          SERVER_START_REQ( map_view )
          {
              req->mapping = wine_server_obj_handle( handle );
              req->access  = access;
              req->base    = wine_server_client_ptr( view->base );
              req->size    = size;
              req->start   = offset.QuadPart;
              res = wine_server_call( req );
          }
          SERVER_END_REQ;
      }
  
      if (res == STATUS_SUCCESS)
      {
          *addr_ptr = view->base;
          *size_ptr = size;
          VIRTUAL_DEBUG_DUMP_VIEW( view );
      }
      else
      {
          ERR( "mapping %p %lx %x%08x failed\n", view->base, size, offset.u.HighPart, offset.u.LowPart );
          delete_view( view );
      }
  
      server_leave_uninterrupted_section( &csVirtual, &sigset );
  
  done:
      if (needs_close) close( unix_handle );
      return res;
  }
  
  
  struct alloc_virtual_heap
  {
      void * HOSTPTR base;
      size_t size;
  };
  
  /* callback for wine_mmap_enum_reserved_areas to allocate space for the virtual heap */
  static int alloc_virtual_heap( void * HOSTPTR base, size_t size, void * HOSTPTR arg )
  {
      struct alloc_virtual_heap * HOSTPTR alloc = arg;
  
      if (is_beyond_limit( base, size, address_space_limit ))
      {
          if (is_beyond_limit( base, size, address_space_hard_limit ))
              address_space_limit = address_space_hard_limit;
          else
              address_space_limit = ADDRSPACECAST(char *, base) + size;
      }
      if (size < alloc->size) return 0;
      if (wine_is_64bit() && base < (void *)0x80000000) return 0;
      alloc->base = wine_anon_mmap( (char * HOSTPTR)base + size - alloc->size, alloc->size,
                                    PROT_READ|PROT_WRITE, MAP_FIXED );
      return (alloc->base != MAP_FAILED_HOSTPTR);
  }
  
  /***********************************************************************
   *           virtual_init
   */
  void virtual_init(void)
  {
      const char * HOSTPTR preload;
      struct alloc_virtual_heap alloc_views;
      size_t size;
  
  #if !defined(__i386__) && !defined(__x86_64__) && !defined(__i386_on_x86_64__)
      page_size = sysconf( _SC_PAGESIZE );
      page_mask = page_size - 1;
      /* Make sure we have a power of 2 */
      assert( !(page_size & page_mask) );
      page_shift = 0;
      while ((1 << page_shift) != page_size) page_shift++;
  #ifdef _WIN64
      address_space_limit = (void *)(((1UL << 47) - 1) & ~page_mask);
  #else
      address_space_limit = (void *)~page_mask;
  #endif
      user_space_limit = working_set_limit = address_space_limit;
  #endif
      if ((preload = getenv("WINEPRELOADRESERVE")))
      {
          unsigned long start, end;
          if (sscanf( preload, "%lx-%lx", &start, &end ) == 2)
          {
              preload_reserve_start = TRUNCCAST(void *, start);
              preload_reserve_end = TRUNCCAST(void *, end);
              /* some apps start inside the DOS area */
              if (preload_reserve_start)
                  address_space_start = min( address_space_start, preload_reserve_start );
          }
      }
  
      /* try to find space in a reserved area for the views and pages protection table */
  #ifdef _WIN64
      pages_vprot_size = ((size_t)address_space_limit >> page_shift >> pages_vprot_shift) + 1;
      alloc_views.size = view_block_size + pages_vprot_size * sizeof(*pages_vprot);
  #else
      alloc_views.size = view_block_size + (1U << (32 - page_shift));
  #endif
      if (wine_mmap_enum_reserved_areas( alloc_virtual_heap, &alloc_views, 1 ))
          wine_mmap_remove_reserved_area( alloc_views.base, alloc_views.size, 0 );
      else
          alloc_views.base = wine_anon_mmap( NULL, alloc_views.size, PROT_READ | PROT_WRITE, 0 );
  
      assert( alloc_views.base != MAP_FAILED_HOSTPTR );
      view_block_start = alloc_views.base;
      view_block_end = view_block_start + view_block_size / sizeof(*view_block_start);
      pages_vprot = (void * HOSTPTR)((char * HOSTPTR)alloc_views.base + view_block_size);
      wine_rb_init( &views_tree, compare_view );
  
      /* make the DOS area accessible (except the low 64K) to hide bugs in broken apps like Excel 2003 */
      size = (char *)address_space_start - (char *)0x10000;
      if (size && wine_mmap_is_in_reserved_area( (void*)0x10000, size ) == 1)
          wine_anon_mmap( (void *)0x10000, size, PROT_READ | PROT_WRITE, MAP_FIXED );
  }
  
  
  /***********************************************************************
   *           virtual_init_threading
   */
  void virtual_init_threading(void)
  {
      use_locks = TRUE;
  }
  
  
  /***********************************************************************
   *           virtual_get_system_info
   */
  void virtual_get_system_info( SYSTEM_BASIC_INFORMATION *info )
  {
  #ifdef HAVE_SYSINFO
      struct sysinfo sinfo;
  #endif
  
      info->unknown                 = 0;
      info->KeMaximumIncrement      = 0;  /* FIXME */
      info->PageSize                = page_size;
      info->MmLowestPhysicalPage    = 1;
      info->MmHighestPhysicalPage   = 0x7fffffff / page_size;
  #ifdef HAVE_SYSINFO
      if (!sysinfo(&sinfo))
      {
          ULONG64 total = (ULONG64)sinfo.totalram * sinfo.mem_unit;
          info->MmHighestPhysicalPage = max(1, total / page_size);
      }
  #endif
      info->MmNumberOfPhysicalPages = info->MmHighestPhysicalPage - info->MmLowestPhysicalPage;
      info->AllocationGranularity   = get_mask(0) + 1;
      info->LowestUserAddress       = (void *)0x10000;
      info->HighestUserAddress      = (char *)user_space_limit - 1;
      info->ActiveProcessorsAffinityMask = get_system_affinity_mask();
      info->NumberOfProcessors      = NtCurrentTeb()->Peb->NumberOfProcessors;
  }
  
  
  /***********************************************************************
   *           virtual_create_builtin_view
   */
  NTSTATUS virtual_create_builtin_view( void *module )
  {
      NTSTATUS status;
      sigset_t sigset;
      IMAGE_NT_HEADERS *nt = RtlImageNtHeader( module );
      SIZE_T size = nt->OptionalHeader.SizeOfImage;
      IMAGE_SECTION_HEADER *sec;
      struct file_view *view;
      void *base;
      int i;
  
      size = ROUND_SIZE( module, size );
      base = ROUND_ADDR( module, page_mask );
      server_enter_uninterrupted_section( &csVirtual, &sigset );
      status = create_view( &view, base, size, SEC_IMAGE | SEC_FILE | VPROT_SYSTEM |
                            VPROT_COMMITTED | VPROT_READ | VPROT_WRITECOPY | VPROT_EXEC );
      if (!status)
      {
          TRACE( "created %p-%p\n", base, (char *)base + size );
  
          /* The PE header is always read-only, no write, no execute. */
          set_page_vprot( base, page_size, VPROT_COMMITTED | VPROT_READ );
  
          sec = (IMAGE_SECTION_HEADER *)((char *)&nt->OptionalHeader + nt->FileHeader.SizeOfOptionalHeader);
          for (i = 0; i < nt->FileHeader.NumberOfSections; i++)
          {
              BYTE flags = VPROT_COMMITTED;
  
              if (sec[i].Characteristics & IMAGE_SCN_MEM_EXECUTE) flags |= VPROT_EXEC;
              if (sec[i].Characteristics & IMAGE_SCN_MEM_READ) flags |= VPROT_READ;
              if (sec[i].Characteristics & IMAGE_SCN_MEM_WRITE) flags |= VPROT_WRITE;
              set_page_vprot( (char *)base + sec[i].VirtualAddress, sec[i].Misc.VirtualSize, flags );
          }
          VIRTUAL_DEBUG_DUMP_VIEW( view );
      }
      server_leave_uninterrupted_section( &csVirtual, &sigset );
      return status;
  }
  
  
  /***********************************************************************
   *           virtual_alloc_thread_stack
   */
  NTSTATUS virtual_alloc_thread_stack( INITIAL_TEB *stack, SIZE_T reserve_size, SIZE_T commit_size, SIZE_T *pthread_size )
  {
      struct file_view *view;
      NTSTATUS status;
      sigset_t sigset;
      SIZE_T size, extra_size = 0;
  
      if (!reserve_size || !commit_size)
      {
          IMAGE_NT_HEADERS *nt = RtlImageNtHeader( NtCurrentTeb()->Peb->ImageBaseAddress );
          if (!reserve_size) reserve_size = nt->OptionalHeader.SizeOfStackReserve;
          if (!commit_size) commit_size = nt->OptionalHeader.SizeOfStackCommit;
      }
  
      size = max( reserve_size, commit_size );
      if (size < 1024 * 1024) size = 1024 * 1024;  /* Xlib needs a large stack */
      size = (size + 0xffff) & ~0xffff;  /* round to 64K boundary */
      if (pthread_size) *pthread_size = extra_size = max( page_size, ROUND_SIZE( 0, *pthread_size ));
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
  
      if ((status = map_view( &view, NULL, size + extra_size, 0, FALSE,
                              VPROT_READ | VPROT_WRITE | VPROT_COMMITTED, 0 )) != STATUS_SUCCESS)
          goto done;
  
  #ifdef VALGRIND_STACK_REGISTER
      VALGRIND_STACK_REGISTER( view->base, (char *)view->base + view->size );
  #endif
  
      /* setup no access guard page */
      set_page_vprot( view->base, page_size, VPROT_COMMITTED );
      set_page_vprot( (char *)view->base + page_size, page_size,
                      VPROT_READ | VPROT_WRITE | VPROT_COMMITTED | VPROT_GUARD );
      mprotect_range( view->base, 2 * page_size, 0, 0 );
      VIRTUAL_DEBUG_DUMP_VIEW( view );
  
      if (extra_size)
      {
          struct file_view *extra_view;
  
          /* shrink the first view and create a second one for the extra size */
          /* this allows the app to free the stack without freeing the thread start portion */
          view->size -= extra_size;
          status = create_view( &extra_view, (char *)view->base + view->size, extra_size,
                                VPROT_READ | VPROT_WRITE | VPROT_COMMITTED );
          if (status != STATUS_SUCCESS)
          {
              unmap_area( (char *)view->base + view->size, extra_size );
              delete_view( view );
              goto done;
          }
      }
  
      /* note: limit is lower than base since the stack grows down */
      stack->OldStackBase = 0;
      stack->OldStackLimit = 0;
      stack->DeallocationStack = view->base;
      stack->StackBase = (char *)view->base + view->size;
      stack->StackLimit = (char *)view->base + 2 * page_size;
  done:
      server_leave_uninterrupted_section( &csVirtual, &sigset );
      return status;
  }
  
  
  /***********************************************************************
   *           virtual_clear_thread_stack
   *
   * Clear the stack contents before calling the main entry point, some broken apps need that.
   */
  void virtual_clear_thread_stack( void *stack_end )
  {
      void *stack = NtCurrentTeb()->Tib.StackLimit;
      size_t size = (char *)stack_end - (char *)stack;
  
      wine_anon_mmap( stack, size, PROT_READ | PROT_WRITE, MAP_FIXED );
      if (force_exec_prot) mprotect( stack, size, PROT_READ | PROT_WRITE | PROT_EXEC );
  }
  
  /**********************************************************************
   *           RtlCreateUserStack (NTDLL.@)
   */
  NTSTATUS WINAPI RtlCreateUserStack( SIZE_T commit, SIZE_T reserve, ULONG zero_bits,
                                      SIZE_T commit_align, SIZE_T reserve_align, INITIAL_TEB *stack )
  {
      TRACE("commit %#lx, reserve %#lx, zero_bits %u, commit_align %#lx, reserve_align %#lx, stack %p\n",
              commit, reserve, zero_bits, commit_align, reserve_align, stack);
  
      if (!commit_align || !reserve_align)
          return STATUS_INVALID_PARAMETER;
  
      if (!commit || !reserve)
      {
          IMAGE_NT_HEADERS *nt = RtlImageNtHeader( NtCurrentTeb()->Peb->ImageBaseAddress );
          if (!reserve) reserve = nt->OptionalHeader.SizeOfStackReserve;
          if (!commit) commit = nt->OptionalHeader.SizeOfStackCommit;
      }
  
      reserve = (reserve + reserve_align - 1) & ~(reserve_align - 1);
      commit = (commit + commit_align - 1) & ~(commit_align - 1);
  
      return virtual_alloc_thread_stack( stack, reserve, commit, NULL );
  }
  
  /**********************************************************************
   *           RtlFreeUserStack (NTDLL.@)
   */
  void WINAPI RtlFreeUserStack( void *stack )
  {
      SIZE_T size = 0;
  
      TRACE("stack %p\n", stack);
  
      NtFreeVirtualMemory( NtCurrentProcess(), &stack, &size, MEM_RELEASE );
  }
  
  /***********************************************************************
   *           virtual_handle_fault
   */
  NTSTATUS virtual_handle_fault( const void * HOSTPTR addr, DWORD err, BOOL on_signal_stack )
  {
      NTSTATUS ret = STATUS_ACCESS_VIOLATION;
      void *page;
      BOOL update_shared_data = FALSE;
      sigset_t sigset;
      BYTE vprot;
  
  #ifdef __i386_on_x86_64__
      /* we can only handle faults in 32-bit space */
      if ((ULONG_HOSTPTR)addr >> 32) return ret;
  #endif
  
      page = ROUND_ADDR( TRUNCCAST( void *, addr ), page_mask );
      server_enter_uninterrupted_section( &csVirtual, &sigset );
      vprot = get_page_vprot( page );
      if (!on_signal_stack && (vprot & VPROT_GUARD))
      {
          set_page_vprot_bits( page, page_size, 0, VPROT_GUARD );
          mprotect_range( page, page_size, 0, 0 );
          ret = STATUS_GUARD_PAGE_VIOLATION;
      }
      else if (err & EXCEPTION_WRITE_FAULT)
      {
          if (vprot & VPROT_WRITEWATCH)
          {
              set_page_vprot_bits( page, page_size, 0, VPROT_WRITEWATCH );
              mprotect_range( page, page_size, 0, 0 );
          }
          /* ignore fault if page is writable now */
          if (VIRTUAL_GetUnixProt( get_page_vprot( page )) & PROT_WRITE)
          {
              if ((vprot & VPROT_WRITEWATCH) || is_write_watch_range( page, page_size ))
                  ret = STATUS_SUCCESS;
          }
      }
      else if (!err && page == user_shared_data_external)
      {
          if (!(vprot & VPROT_READ))
          {
              set_page_vprot_bits( page, page_size, VPROT_READ | VPROT_WRITE, 0 );
              mprotect_range( page, page_size, 0, 0 );
              update_shared_data = TRUE;
          }
          /* ignore fault if page is readable now */
          if (VIRTUAL_GetUnixProt( get_page_vprot( page )) & PROT_READ) ret = STATUS_SUCCESS;
          else update_shared_data = FALSE;
      }
      else if (!err && (VIRTUAL_GetUnixProt( vprot ) & PROT_READ) && is_system_range( page, page_size ))
      {
          int unix_prot = VIRTUAL_GetUnixProt( vprot );
          unsigned char vec;
  
          mprotect_range( page, page_size, 0, 0 );
          if (!mincore( page, page_size, &vec ) && (vec & 1))
              ret = STATUS_SUCCESS;
          else if (wine_anon_mmap( page, page_size, unix_prot, MAP_FIXED ) == page)
              ret = STATUS_SUCCESS;
          else
              set_page_vprot_bits( page, page_size, 0, VPROT_READ | VPROT_EXEC );
      }
      server_leave_uninterrupted_section( &csVirtual, &sigset );
  
      if (update_shared_data)
          create_user_shared_data_thread();
  
      return ret;
  }
  
  
  /***********************************************************************
   *           check_write_access
   *
   * Check if the memory range is writable, temporarily disabling write watches if necessary.
   */
  static NTSTATUS check_write_access( void *base, size_t size, BOOL *has_write_watch )
  {
      size_t i;
      char *addr = ROUND_ADDR( base, page_mask );
  
      size = ROUND_SIZE( base, size );
      for (i = 0; i < size; i += page_size)
      {
          BYTE vprot = get_page_vprot( addr + i );
          if (vprot & VPROT_WRITEWATCH) *has_write_watch = TRUE;
          if (!(VIRTUAL_GetUnixProt( vprot & ~VPROT_WRITEWATCH ) & PROT_WRITE))
              return STATUS_INVALID_USER_BUFFER;
      }
      if (*has_write_watch)
          mprotect_range( addr, size, 0, VPROT_WRITEWATCH );  /* temporarily enable write access */
      return STATUS_SUCCESS;
  }
  
  
  /***********************************************************************
   *           virtual_locked_server_call
   */
  unsigned int virtual_locked_server_call( void *req_ptr )
  {
      struct __server_request_info * const req = req_ptr;
      sigset_t sigset;
      void *addr = req->reply_data;
      data_size_t size = req->u.req.request_header.reply_size;
      BOOL has_write_watch = FALSE;
      unsigned int ret = STATUS_ACCESS_VIOLATION;
  
      if (!size) return wine_server_call( req_ptr );
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
      if (!(ret = check_write_access( addr, size, &has_write_watch )))
      {
          ret = server_call_unlocked( req );
          if (has_write_watch) update_write_watches( addr, size, wine_server_reply_size( req ));
      }
      server_leave_uninterrupted_section( &csVirtual, &sigset );
      return ret;
  }
  
  
  /***********************************************************************
   *           virtual_locked_read
   */
  ssize_t virtual_locked_read( int fd, void *addr, size_t size )
  {
      sigset_t sigset;
      BOOL has_write_watch = FALSE;
      int err = EFAULT;
  
      ssize_t ret = read( fd, addr, size );
      if (ret != -1 || errno != EFAULT) return ret;
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
      if (!check_write_access( addr, size, &has_write_watch ))
      {
          ret = read( fd, addr, size );
          err = errno;
          if (has_write_watch) update_write_watches( addr, size, max( 0, ret ));
      }
      server_leave_uninterrupted_section( &csVirtual, &sigset );
      errno = err;
      return ret;
  }
  
  
  /***********************************************************************
   *           virtual_locked_pread
   */
  ssize_t virtual_locked_pread( int fd, void *addr, size_t size, off_t offset )
  {
      sigset_t sigset;
      BOOL has_write_watch = FALSE;
      int err = EFAULT;
  
      ssize_t ret = pread( fd, addr, size, offset );
      if (ret != -1 || errno != EFAULT) return ret;
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
      if (!check_write_access( addr, size, &has_write_watch ))
      {
          ret = pread( fd, addr, size, offset );
          err = errno;
          if (has_write_watch) update_write_watches( addr, size, max( 0, ret ));
      }
      server_leave_uninterrupted_section( &csVirtual, &sigset );
      errno = err;
      return ret;
  }
  
  
  /***********************************************************************
   *           __wine_locked_recvmsg
   */
  ssize_t CDECL __wine_locked_recvmsg( int fd, struct msghdr * WIN32PTR hdr, int flags )
  {
      sigset_t sigset;
      size_t i;
      BOOL has_write_watch = FALSE;
      int err = EFAULT;
  
      ssize_t ret = recvmsg( fd, hdr, flags );
      if (ret != -1 || errno != EFAULT) return ret;
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
      for (i = 0; i < hdr->msg_iovlen; i++)
          if (check_write_access( ADDRSPACECAST(void *, hdr->msg_iov[i].iov_base), hdr->msg_iov[i].iov_len, &has_write_watch ))
              break;
      if (i == hdr->msg_iovlen)
      {
          ret = recvmsg( fd, hdr, flags );
          err = errno;
      }
      if (has_write_watch)
          while (i--) update_write_watches( ADDRSPACECAST(void *, hdr->msg_iov[i].iov_base), hdr->msg_iov[i].iov_len, 0 );
  
      server_leave_uninterrupted_section( &csVirtual, &sigset );
      errno = err;
      return ret;
  }
  
  
  /***********************************************************************
   *           virtual_is_valid_code_address
   */
  BOOL virtual_is_valid_code_address( const void *addr, SIZE_T size )
  {
      struct file_view *view;
      BOOL ret = FALSE;
      sigset_t sigset;
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
      if ((view = VIRTUAL_FindView( addr, size )))
          ret = !(view->protect & VPROT_SYSTEM);  /* system views are not visible to the app */
      server_leave_uninterrupted_section( &csVirtual, &sigset );
      return ret;
  }
  
  
  /***********************************************************************
   *           virtual_handle_stack_fault
   *
   * Handle an access fault inside the current thread stack.
   * Called from inside a signal handler.
   */
  BOOL virtual_handle_stack_fault( void *addr )
  {
      BOOL ret = FALSE;
  
      RtlEnterCriticalSection( &csVirtual );  /* no need for signal masking inside signal handler */
      if (get_page_vprot( addr ) & VPROT_GUARD)
      {
          char *page = ROUND_ADDR( addr, page_mask );
          set_page_vprot_bits( page, page_size, 0, VPROT_GUARD );
          mprotect_range( page, page_size, 0, 0 );
          NtCurrentTeb()->Tib.StackLimit = page;
          if (page >= (char *)NtCurrentTeb()->DeallocationStack + 2*page_size)
          {
              page -= page_size;
              set_page_vprot_bits( page, page_size, VPROT_COMMITTED | VPROT_GUARD, 0 );
              mprotect_range( page, page_size, 0, 0 );
          }
          ret = TRUE;
      }
      RtlLeaveCriticalSection( &csVirtual );
      return ret;
  }
  
  
  /***********************************************************************
   *           virtual_check_buffer_for_read
   *
   * Check if a memory buffer can be read, triggering page faults if needed for DIB section access.
   */
  BOOL virtual_check_buffer_for_read( const void *ptr, SIZE_T size )
  {
      if (!size) return TRUE;
      if (!ptr) return FALSE;
  
      __TRY
      {
          volatile const char *p = ptr;
          char dummy __attribute__((unused));
          SIZE_T count = size;
  
          while (count > page_size)
          {
              dummy = *p;
              p += page_size;
              count -= page_size;
          }
          dummy = p[0];
          dummy = p[count - 1];
      }
      __EXCEPT_PAGE_FAULT
      {
          return FALSE;
      }
      __ENDTRY
      return TRUE;
  }
  
  
  /***********************************************************************
   *           virtual_check_buffer_for_write
   *
   * Check if a memory buffer can be written to, triggering page faults if needed for write watches.
   */
  BOOL virtual_check_buffer_for_write( void *ptr, SIZE_T size )
  {
      if (!size) return TRUE;
      if (!ptr) return FALSE;
  
      __TRY
      {
          volatile char *p = ptr;
          SIZE_T count = size;
  
          while (count > page_size)
          {
              *p |= 0;
              p += page_size;
              count -= page_size;
          }
          p[0] |= 0;
          p[count - 1] |= 0;
      }
      __EXCEPT_PAGE_FAULT
      {
          return FALSE;
      }
      __ENDTRY
      return TRUE;
  }
  
  
  /***********************************************************************
   *           virtual_uninterrupted_read_memory
   *
   * Similar to NtReadVirtualMemory, but without wineserver calls. Moreover
   * permissions are checked before accessing each page, to ensure that no
   * exceptions can happen.
   */
  SIZE_T virtual_uninterrupted_read_memory( const void *addr, void *buffer, SIZE_T size )
  {
      struct file_view *view;
      sigset_t sigset;
      SIZE_T bytes_read = 0;
  
      if (!size) return 0;
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
      if ((view = VIRTUAL_FindView( addr, size )))
      {
          if (!(view->protect & VPROT_SYSTEM))
          {
              char *page = ROUND_ADDR( addr, page_mask );
  
              while (bytes_read < size && (VIRTUAL_GetUnixProt( get_page_vprot( page )) & PROT_READ))
              {
                  SIZE_T block_size = min( size, page_size - ((UINT_PTR)addr & page_mask) );
                  memcpy( buffer, addr, block_size );
  
                  addr   = (const void *)((const char *)addr + block_size);
                  buffer = (void *)((char *)buffer + block_size);
                  bytes_read += block_size;
                  page += page_size;
              }
          }
      }
      server_leave_uninterrupted_section( &csVirtual, &sigset );
      return bytes_read;
  }
  
  
  /***********************************************************************
   *           virtual_uninterrupted_write_memory
   *
   * Similar to NtWriteVirtualMemory, but without wineserver calls. Moreover
   * permissions are checked before accessing each page, to ensure that no
   * exceptions can happen.
   */
  NTSTATUS virtual_uninterrupted_write_memory( void *addr, const void *buffer, SIZE_T size )
  {
      BOOL has_write_watch = FALSE;
      sigset_t sigset;
      NTSTATUS ret;
  
      if (!size) return STATUS_SUCCESS;
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
      if (!(ret = check_write_access( addr, size, &has_write_watch )))
      {
          memcpy( addr, buffer, size );
          if (has_write_watch) update_write_watches( addr, size, size );
      }
      server_leave_uninterrupted_section( &csVirtual, &sigset );
      return ret;
  }
  
  
  /***********************************************************************
   *           VIRTUAL_SetForceExec
   *
   * Whether to force exec prot on all views.
   */
  void VIRTUAL_SetForceExec( BOOL enable )
  {
      struct file_view *view;
      sigset_t sigset;
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
      if (!force_exec_prot != !enable)  /* change all existing views */
      {
          force_exec_prot = enable;
  
          WINE_RB_FOR_EACH_ENTRY( view, &views_tree, struct file_view, entry )
          {
              /* file mappings are always accessible */
              BYTE commit = is_view_valloc( view ) ? 0 : VPROT_COMMITTED;
  
              mprotect_range( view->base, view->size, commit, 0 );
          }
      }
      server_leave_uninterrupted_section( &csVirtual, &sigset );
  }
  
  struct free_range
  {
      char *base;
      char *limit;
  };
  
  /* free reserved areas above the limit; callback for wine_mmap_enum_reserved_areas */
  static int free_reserved_memory( void * HOSTPTR start, size_t size, void * HOSTPTR arg )
  {
      struct free_range * HOSTPTR range = arg;
      char * HOSTPTR base = (char * HOSTPTR)start;
  
      if (base >= range->limit) return 0;
      if (base + size <= range->base) return 0;
      if (base < range->base)
      {
          size -= range->base - base;
          base = range->base;
      }
      if (base + size > range->limit) size = range->limit - base;
      remove_reserved_area( base, size );
      return 1;  /* stop enumeration since the list has changed */
  }
  
  /***********************************************************************
   *           virtual_release_address_space
   *
   * Release some address space once we have loaded and initialized the app.
   */
  void virtual_release_address_space(void)
  {
      struct free_range range;
      sigset_t sigset;
  
      if (wine_is_64bit()) return;
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
  
      range.base  = (char *)0x82000000;
      range.limit = user_space_limit;
  
      if (range.limit > range.base)
      {
          while (wine_mmap_enum_reserved_areas( free_reserved_memory, &range, 1 )) /* nothing */;
  #ifdef __APPLE__
          /* On macOS, we still want to free some of low memory, for OpenGL resources */
          range.base  = (char *)0x40000000;
  #else
          range.base  = NULL;
  #endif
      }
      else
          range.base = (char *)0x20000000;
  
  #ifdef __APPLE__ /* CrossOver Hack #16371 */
      {
          char buf[1024], *p;
          uint32_t size = sizeof(buf);
          if (_NSGetExecutablePath(buf, &size) == 0)
          {
              if ((p = strrchr(buf, '/'))) ++p;
              else p = buf;
              if (!strcasestr(p, "preloader"))
                  range.base  = (char *)0x40001000;
          }
      }
  #endif
      if (range.base)
      {
          range.limit = (char *)0x7f000000;
          while (wine_mmap_enum_reserved_areas( free_reserved_memory, &range, 0 )) /* nothing */;
      }
  
      server_leave_uninterrupted_section( &csVirtual, &sigset );
  }
  
  
  /***********************************************************************
   *           virtual_set_large_address_space
   *
   * Enable use of a large address space when allowed by the application.
   */
  void virtual_set_large_address_space(void)
  {
      IMAGE_NT_HEADERS *nt = RtlImageNtHeader( NtCurrentTeb()->Peb->ImageBaseAddress );
  
      if (!(nt->FileHeader.Characteristics & IMAGE_FILE_LARGE_ADDRESS_AWARE)) return;
      /* no large address space on win9x */
      if (NtCurrentTeb()->Peb->OSPlatformId != VER_PLATFORM_WIN32_NT) return;
  
      user_space_limit = working_set_limit = address_space_limit;
  }
  
  
  /***********************************************************************
   *             NtAllocateVirtualMemory   (NTDLL.@)
   *             ZwAllocateVirtualMemory   (NTDLL.@)
   */
  NTSTATUS WINAPI NtAllocateVirtualMemory( HANDLE process, PVOID *ret, ULONG zero_bits,
                                           SIZE_T *size_ptr, ULONG type, ULONG protect )
  {
      SIZE_T size = *size_ptr;
      NTSTATUS status = STATUS_SUCCESS;
  
      TRACE("%p %p %08lx %x %08x\n", process, *ret, size, type, protect );
  
      if (!size) return STATUS_INVALID_PARAMETER;
      if (zero_bits > 21 && zero_bits < 32) return STATUS_INVALID_PARAMETER_3;
      if (!wine_is_64bit() && !is_wow64 && zero_bits >= 32) return STATUS_INVALID_PARAMETER_3;
  
      if (process != NtCurrentProcess())
      {
          apc_call_t call;
          apc_result_t result;
  
          memset( &call, 0, sizeof(call) );
  
          call.virtual_alloc.type      = APC_VIRTUAL_ALLOC;
          call.virtual_alloc.addr      = wine_server_client_ptr( *ret );
          call.virtual_alloc.size      = *size_ptr;
          call.virtual_alloc.zero_bits = zero_bits;
          call.virtual_alloc.op_type   = type;
          call.virtual_alloc.prot      = protect;
          status = server_queue_process_apc( process, &call, &result );
          if (status != STATUS_SUCCESS) return status;
  
          if (result.virtual_alloc.status == STATUS_SUCCESS)
          {
              *ret      = wine_server_get_ptr( result.virtual_alloc.addr );
              *size_ptr = result.virtual_alloc.size;
          }
          return result.virtual_alloc.status;
      }
  
      return virtual_alloc_aligned( ret, zero_bits, size_ptr, type, protect, 0 );
  }
  
  
  /***********************************************************************
   *             virtual_alloc_aligned   (NTDLL.@)
   *
   * Same as NtAllocateVirtualMemory but with an alignment parameter
   */
  NTSTATUS virtual_alloc_aligned( PVOID *ret, ULONG zero_bits, SIZE_T *size_ptr,
                                  ULONG type, ULONG protect, ULONG alignment )
  {
      void *base;
      unsigned int vprot;
      SIZE_T size = *size_ptr;
      NTSTATUS status = STATUS_SUCCESS;
      BOOL is_dos_memory = FALSE;
      struct file_view *view;
      sigset_t sigset;
  
      /* Round parameters to a page boundary */
  
      if (is_beyond_limit( 0, size, working_set_limit )) return STATUS_WORKING_SET_LIMIT_RANGE;
  
      if (*ret)
      {
          if (type & MEM_RESERVE) /* Round down to 64k boundary */
              base = ROUND_ADDR( *ret, get_mask( alignment ) );
          else
              base = ROUND_ADDR( *ret, page_mask );
          size = (((UINT_PTR)*ret + size + page_mask) & ~page_mask) - (UINT_PTR)base;
  
          /* disallow low 64k, wrap-around and kernel space */
          if (((char *)base < (char *)0x10000) ||
              ((char *)base + size < (char *)base) ||
              is_beyond_limit( base, size, address_space_limit ))
          {
              /* address 1 is magic to mean DOS area */
              if (!base && *ret == (void *)1 && size == 0x110000) is_dos_memory = TRUE;
              else return STATUS_INVALID_PARAMETER;
          }
      }
      else
      {
          base = NULL;
          size = (size + page_mask) & ~page_mask;
      }
  
      /* Compute the alloc type flags */
  
      if (!(type & (MEM_COMMIT | MEM_RESERVE | MEM_RESET)) ||
          (type & ~(MEM_COMMIT | MEM_RESERVE | MEM_TOP_DOWN | MEM_WRITE_WATCH | MEM_RESET)))
      {
          WARN("called with wrong alloc type flags (%08x) !\n", type);
          return STATUS_INVALID_PARAMETER;
      }
  
      /* Reserve the memory */
  
      if (use_locks) server_enter_uninterrupted_section( &csVirtual, &sigset );
  
      if ((type & MEM_RESERVE) || !base)
      {
          if (!(status = get_vprot_flags( protect, &vprot, FALSE )))
          {
              if (type & MEM_COMMIT) vprot |= VPROT_COMMITTED;
              if (type & MEM_WRITE_WATCH) vprot |= VPROT_WRITEWATCH;
              if (protect & PAGE_NOCACHE) vprot |= SEC_NOCACHE;
  
              if (vprot & VPROT_WRITECOPY) status = STATUS_INVALID_PAGE_PROTECTION;
              else if (is_dos_memory) status = allocate_dos_memory( &view, vprot );
              else status = map_view( &view, base, size, alignment, type & MEM_TOP_DOWN, vprot, zero_bits );
  
              if (status == STATUS_SUCCESS) base = view->base;
          }
      }
      else if (type & MEM_RESET)
      {
          if (!(view = VIRTUAL_FindView( base, size ))) status = STATUS_NOT_MAPPED_VIEW;
          else madvise( base, size, MADV_DONTNEED );
      }
      else  /* commit the pages */
      {
          if (!(view = VIRTUAL_FindView( base, size ))) status = STATUS_NOT_MAPPED_VIEW;
          else if (view->protect & SEC_FILE) status = STATUS_ALREADY_COMMITTED;
          else if (!(status = set_protection( view, base, size, protect )) && (view->protect & SEC_RESERVE))
          {
              SERVER_START_REQ( add_mapping_committed_range )
              {
                  req->base   = wine_server_client_ptr( view->base );
                  req->offset = (char *)base - (char *)view->base;
                  req->size   = size;
                  wine_server_call( req );
              }
              SERVER_END_REQ;
          }
      }
  
      if (!status) VIRTUAL_DEBUG_DUMP_VIEW( view );
  
      if (use_locks) server_leave_uninterrupted_section( &csVirtual, &sigset );
  
      if (status == STATUS_SUCCESS)
      {
          *ret = base;
          *size_ptr = size;
      }
      return status;
  }
  
  
  /***********************************************************************
   *             NtFreeVirtualMemory   (NTDLL.@)
   *             ZwFreeVirtualMemory   (NTDLL.@)
   */
  NTSTATUS WINAPI NtFreeVirtualMemory( HANDLE process, PVOID *addr_ptr, SIZE_T *size_ptr, ULONG type )
  {
      struct file_view *view;
      char *base;
      sigset_t sigset;
      NTSTATUS status = STATUS_SUCCESS;
      LPVOID addr = *addr_ptr;
      SIZE_T size = *size_ptr;
  
      TRACE("%p %p %08lx %x\n", process, addr, size, type );
  
      if (process != NtCurrentProcess())
      {
          apc_call_t call;
          apc_result_t result;
  
          memset( &call, 0, sizeof(call) );
  
          call.virtual_free.type      = APC_VIRTUAL_FREE;
          call.virtual_free.addr      = wine_server_client_ptr( addr );
          call.virtual_free.size      = size;
          call.virtual_free.op_type   = type;
          status = server_queue_process_apc( process, &call, &result );
          if (status != STATUS_SUCCESS) return status;
  
          if (result.virtual_free.status == STATUS_SUCCESS)
          {
              *addr_ptr = wine_server_get_ptr( result.virtual_free.addr );
              *size_ptr = result.virtual_free.size;
          }
          return result.virtual_free.status;
      }
  
      /* Fix the parameters */
  
      size = ROUND_SIZE( addr, size );
      base = ROUND_ADDR( addr, page_mask );
  
      /* avoid freeing the DOS area when a broken app passes a NULL pointer */
      if (!base) return STATUS_INVALID_PARAMETER;
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
  
      if (!(view = VIRTUAL_FindView( base, size )) || !is_view_valloc( view ))
      {
          status = STATUS_INVALID_PARAMETER;
      }
      else if (type == MEM_RELEASE)
      {
          /* Free the pages */
  
          if (size || (base != view->base)) status = STATUS_INVALID_PARAMETER;
          else
          {
              delete_view( view );
              *addr_ptr = base;
              *size_ptr = size;
          }
      }
      else if (type == MEM_DECOMMIT)
      {
          status = decommit_pages( view, base - (char *)view->base, size );
          if (status == STATUS_SUCCESS)
          {
              *addr_ptr = base;
              *size_ptr = size;
          }
      }
      else
      {
          WARN("called with wrong free type flags (%08x) !\n", type);
          status = STATUS_INVALID_PARAMETER;
      }
  
      server_leave_uninterrupted_section( &csVirtual, &sigset );
      return status;
  }
  
  
  /***********************************************************************
   *             NtProtectVirtualMemory   (NTDLL.@)
   *             ZwProtectVirtualMemory   (NTDLL.@)
   */
  NTSTATUS WINAPI NtProtectVirtualMemory( HANDLE process, PVOID *addr_ptr, SIZE_T *size_ptr,
                                          ULONG new_prot, ULONG *old_prot )
  {
      struct file_view *view;
      sigset_t sigset;
      NTSTATUS status = STATUS_SUCCESS;
      char *base;
      BYTE vprot;
      SIZE_T size = *size_ptr;
      LPVOID addr = *addr_ptr;
      DWORD old;
  
      TRACE("%p %p %08lx %08x\n", process, addr, size, new_prot );
  
      if (!old_prot)
          return STATUS_ACCESS_VIOLATION;
  
      if (process != NtCurrentProcess())
      {
          apc_call_t call;
          apc_result_t result;
  
          memset( &call, 0, sizeof(call) );
  
          call.virtual_protect.type = APC_VIRTUAL_PROTECT;
          call.virtual_protect.addr = wine_server_client_ptr( addr );
          call.virtual_protect.size = size;
          call.virtual_protect.prot = new_prot;
          status = server_queue_process_apc( process, &call, &result );
          if (status != STATUS_SUCCESS) return status;
  
          if (result.virtual_protect.status == STATUS_SUCCESS)
          {
              *addr_ptr = wine_server_get_ptr( result.virtual_protect.addr );
              *size_ptr = result.virtual_protect.size;
              *old_prot = result.virtual_protect.prot;
          }
          return result.virtual_protect.status;
      }
  
      /* Fix the parameters */
  
      size = ROUND_SIZE( addr, size );
      base = ROUND_ADDR( addr, page_mask );
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
  
      if ((view = VIRTUAL_FindView( base, size )))
      {
          /* Make sure all the pages are committed */
          if (get_committed_size( view, base, &vprot ) >= size && (vprot & VPROT_COMMITTED))
          {
              old = VIRTUAL_GetWin32Prot( vprot, view->protect );
              status = set_protection( view, base, size, new_prot );
          }
          else status = STATUS_NOT_COMMITTED;
      }
      else status = STATUS_INVALID_PARAMETER;
  
      if (!status) VIRTUAL_DEBUG_DUMP_VIEW( view );
  
      server_leave_uninterrupted_section( &csVirtual, &sigset );
  
      if (status == STATUS_SUCCESS)
      {
          *addr_ptr = base;
          *size_ptr = size;
          *old_prot = old;
      }
      return status;
  }
  
  
  /* retrieve state for a free memory area; callback for wine_mmap_enum_reserved_areas */
  static int get_free_mem_state_callback( void * HOSTPTR start, size_t size, void * HOSTPTR arg )
  {
      MEMORY_BASIC_INFORMATION * HOSTPTR info = arg;
      void * HOSTPTR end = (char * HOSTPTR)start + size;
  
      if ((char *)info->BaseAddress + info->RegionSize <= (char * HOSTPTR)start) return 0;
  
      if (info->BaseAddress >= end)
      {
          if (info->AllocationBase < end) info->AllocationBase = ADDRSPACECAST(void *, end);
          return 0;
      }
  
      if (info->BaseAddress >= start || start <= address_space_start)
      {
          /* it's a real free area */
          info->State             = MEM_FREE;
          info->Protect           = PAGE_NOACCESS;
          info->AllocationBase    = 0;
          info->AllocationProtect = 0;
          info->Type              = 0;
          if ((char *)info->BaseAddress + info->RegionSize > (char * HOSTPTR)end)
              info->RegionSize = (char * HOSTPTR)end - (char *)info->BaseAddress;
      }
      else /* outside of the reserved area, pretend it's allocated */
      {
          info->RegionSize        = (char * HOSTPTR)start - (char *)info->BaseAddress;
          info->State             = MEM_RESERVE;
          info->Protect           = PAGE_NOACCESS;
          info->AllocationProtect = PAGE_NOACCESS;
          info->Type              = MEM_PRIVATE;
      }
      return 1;
  }
  
  #define UNIMPLEMENTED_INFO_CLASS(c) \
      case c: \
          FIXME("(process=%p,addr=%p) Unimplemented information class: " #c "\n", process, addr); \
          return STATUS_INVALID_INFO_CLASS
  
  /***********************************************************************
   *             NtQueryVirtualMemory   (NTDLL.@)
   *             ZwQueryVirtualMemory   (NTDLL.@)
   */
  NTSTATUS WINAPI NtQueryVirtualMemory( HANDLE process, LPCVOID addr,
                                        MEMORY_INFORMATION_CLASS info_class, PVOID buffer,
                                        SIZE_T len, SIZE_T *res_len )
  {
      struct file_view *view;
      char *base, *alloc_base = 0, *alloc_end = working_set_limit;
      struct wine_rb_entry *ptr;
      MEMORY_BASIC_INFORMATION *info = buffer;
      sigset_t sigset;
  
      if (info_class != MemoryBasicInformation)
      {
          switch(info_class)
          {
              UNIMPLEMENTED_INFO_CLASS(MemoryWorkingSetList);
              UNIMPLEMENTED_INFO_CLASS(MemorySectionName);
              UNIMPLEMENTED_INFO_CLASS(MemoryBasicVlmInformation);
  
              default:
                  FIXME("(%p,%p,info_class=%d,%p,%ld,%p) Unknown information class\n", 
                        process, addr, info_class, buffer, len, res_len);
                  return STATUS_INVALID_INFO_CLASS;
          }
      }
  
      if (len < sizeof(MEMORY_BASIC_INFORMATION))
          return STATUS_INFO_LENGTH_MISMATCH;
  
      if (process != NtCurrentProcess())
      {
          NTSTATUS status;
          apc_call_t call;
          apc_result_t result;
  
          memset( &call, 0, sizeof(call) );
  
          call.virtual_query.type = APC_VIRTUAL_QUERY;
          call.virtual_query.addr = wine_server_client_ptr( addr );
          status = server_queue_process_apc( process, &call, &result );
          if (status != STATUS_SUCCESS) return status;
  
          if (result.virtual_query.status == STATUS_SUCCESS)
          {
              info->BaseAddress       = wine_server_get_ptr( result.virtual_query.base );
              info->AllocationBase    = wine_server_get_ptr( result.virtual_query.alloc_base );
              info->RegionSize        = result.virtual_query.size;
              info->Protect           = result.virtual_query.prot;
              info->AllocationProtect = result.virtual_query.alloc_prot;
              info->State             = (DWORD)result.virtual_query.state << 12;
              info->Type              = (DWORD)result.virtual_query.alloc_type << 16;
              if (info->RegionSize != result.virtual_query.size)  /* truncated */
                  return STATUS_INVALID_PARAMETER;  /* FIXME */
              if (res_len) *res_len = sizeof(*info);
          }
          return result.virtual_query.status;
      }
  
      base = ROUND_ADDR( addr, page_mask );
  
      if (is_beyond_limit( base, 1, working_set_limit )) return STATUS_INVALID_PARAMETER;
  
      /* Find the view containing the address */
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
      ptr = views_tree.root;
      while (ptr)
      {
          view = WINE_RB_ENTRY_VALUE( ptr, struct file_view, entry );
          if ((char *)view->base > base)
          {
              alloc_end = view->base;
              ptr = ptr->left;
          }
          else if ((char *)view->base + view->size <= base)
          {
              alloc_base = (char *)view->base + view->size;
              ptr = ptr->right;
          }
          else
          {
              alloc_base = view->base;
              alloc_end = (char *)view->base + view->size;
              break;
          }
      }
  
      /* Fill the info structure */
  
      info->AllocationBase = alloc_base;
      info->BaseAddress    = base;
      info->RegionSize     = alloc_end - base;
  
      if (!ptr)
      {
          if (!wine_mmap_enum_reserved_areas( get_free_mem_state_callback, info, 0 ))
          {
              /* not in a reserved area at all, pretend it's allocated */
  #if defined(__i386__) || defined(__i386_on_x86_64__)
              if (base >= (char *)address_space_start)
              {
                  info->State             = MEM_RESERVE;
                  info->Protect           = PAGE_NOACCESS;
                  info->AllocationProtect = PAGE_NOACCESS;
                  info->Type              = MEM_PRIVATE;
              }
              else
  #endif
              {
                  info->State             = MEM_FREE;
                  info->Protect           = PAGE_NOACCESS;
                  info->AllocationBase    = 0;
                  info->AllocationProtect = 0;
                  info->Type              = 0;
              }
          }
      }
      else
      {
          BYTE vprot;
          char *ptr;
          SIZE_T range_size = get_committed_size( view, base, &vprot );
  
          info->State = (vprot & VPROT_COMMITTED) ? MEM_COMMIT : MEM_RESERVE;
          info->Protect = (vprot & VPROT_COMMITTED) ? VIRTUAL_GetWin32Prot( vprot, view->protect ) : 0;
          info->AllocationProtect = VIRTUAL_GetWin32Prot( view->protect, view->protect );
          if (view->protect & SEC_IMAGE) info->Type = MEM_IMAGE;
          else if (view->protect & (SEC_FILE | SEC_RESERVE | SEC_COMMIT)) info->Type = MEM_MAPPED;
          else info->Type = MEM_PRIVATE;
          for (ptr = base; ptr < base + range_size; ptr += page_size)
              if ((get_page_vprot( ptr ) ^ vprot) & ~VPROT_WRITEWATCH) break;
          info->RegionSize = ptr - base;
      }
      server_leave_uninterrupted_section( &csVirtual, &sigset );
  
      if (res_len) *res_len = sizeof(*info);
      return STATUS_SUCCESS;
  }
  
  
  /***********************************************************************
   *             NtLockVirtualMemory   (NTDLL.@)
   *             ZwLockVirtualMemory   (NTDLL.@)
   */
  NTSTATUS WINAPI NtLockVirtualMemory( HANDLE process, PVOID *addr, SIZE_T *size, ULONG unknown )
  {
      NTSTATUS status = STATUS_SUCCESS;
  
      if (process != NtCurrentProcess())
      {
          apc_call_t call;
          apc_result_t result;
  
          memset( &call, 0, sizeof(call) );
  
          call.virtual_lock.type = APC_VIRTUAL_LOCK;
          call.virtual_lock.addr = wine_server_client_ptr( *addr );
          call.virtual_lock.size = *size;
          status = server_queue_process_apc( process, &call, &result );
          if (status != STATUS_SUCCESS) return status;
  
          if (result.virtual_lock.status == STATUS_SUCCESS)
          {
              *addr = wine_server_get_ptr( result.virtual_lock.addr );
              *size = result.virtual_lock.size;
          }
          return result.virtual_lock.status;
      }
  
      *size = ROUND_SIZE( *addr, *size );
      *addr = ROUND_ADDR( *addr, page_mask );
  
      if (mlock( *addr, *size )) status = STATUS_ACCESS_DENIED;
      return status;
  }
  
  
  /***********************************************************************
   *             NtUnlockVirtualMemory   (NTDLL.@)
   *             ZwUnlockVirtualMemory   (NTDLL.@)
   */
  NTSTATUS WINAPI NtUnlockVirtualMemory( HANDLE process, PVOID *addr, SIZE_T *size, ULONG unknown )
  {
      NTSTATUS status = STATUS_SUCCESS;
  
      if (process != NtCurrentProcess())
      {
          apc_call_t call;
          apc_result_t result;
  
          memset( &call, 0, sizeof(call) );
  
          call.virtual_unlock.type = APC_VIRTUAL_UNLOCK;
          call.virtual_unlock.addr = wine_server_client_ptr( *addr );
          call.virtual_unlock.size = *size;
          status = server_queue_process_apc( process, &call, &result );
          if (status != STATUS_SUCCESS) return status;
  
          if (result.virtual_unlock.status == STATUS_SUCCESS)
          {
              *addr = wine_server_get_ptr( result.virtual_unlock.addr );
              *size = result.virtual_unlock.size;
          }
          return result.virtual_unlock.status;
      }
  
      *size = ROUND_SIZE( *addr, *size );
      *addr = ROUND_ADDR( *addr, page_mask );
  
      if (munlock( *addr, *size )) status = STATUS_ACCESS_DENIED;
      return status;
  }
  
  
  /***********************************************************************
   *             NtCreateSection   (NTDLL.@)
   *             ZwCreateSection   (NTDLL.@)
   */
  NTSTATUS WINAPI NtCreateSection( HANDLE *handle, ACCESS_MASK access, const OBJECT_ATTRIBUTES *attr,
                                   const LARGE_INTEGER *size, ULONG protect,
                                   ULONG sec_flags, HANDLE file )
  {
      NTSTATUS ret;
      unsigned int vprot, file_access = 0;
      data_size_t len;
      struct object_attributes *objattr;
  
      if ((ret = get_vprot_flags( protect, &vprot, sec_flags & SEC_IMAGE ))) return ret;
      if ((ret = alloc_object_attributes( attr, &objattr, &len ))) return ret;
  
      if (vprot & VPROT_READ)  file_access |= FILE_READ_DATA;
      if (vprot & VPROT_WRITE) file_access |= FILE_WRITE_DATA;
  
      SERVER_START_REQ( create_mapping )
      {
          req->access      = access;
          req->flags       = sec_flags;
          req->file_handle = wine_server_obj_handle( file );
          req->file_access = file_access;
          req->size        = size ? size->QuadPart : 0;
          wine_server_add_data( req, objattr, len );
          ret = wine_server_call( req );
          *handle = wine_server_ptr_handle( reply->handle );
      }
      SERVER_END_REQ;
  
      RtlFreeHeap( GetProcessHeap(), 0, objattr );
      return ret;
  }
  
  
  /***********************************************************************
   *             NtOpenSection   (NTDLL.@)
   *             ZwOpenSection   (NTDLL.@)
   */
  NTSTATUS WINAPI NtOpenSection( HANDLE *handle, ACCESS_MASK access, const OBJECT_ATTRIBUTES *attr )
  {
      NTSTATUS ret;
  
      if ((ret = validate_open_object_attributes( attr ))) return ret;
  
      SERVER_START_REQ( open_mapping )
      {
          req->access     = access;
          req->attributes = attr->Attributes;
          req->rootdir    = wine_server_obj_handle( attr->RootDirectory );
          if (attr->ObjectName)
              wine_server_add_data( req, attr->ObjectName->Buffer, attr->ObjectName->Length );
          ret = wine_server_call( req );
          *handle = wine_server_ptr_handle( reply->handle );
      }
      SERVER_END_REQ;
      return ret;
  }
  
  
  /***********************************************************************
   *             NtMapViewOfSection   (NTDLL.@)
   *             ZwMapViewOfSection   (NTDLL.@)
   */
  NTSTATUS WINAPI NtMapViewOfSection( HANDLE handle, HANDLE process, PVOID *addr_ptr, ULONG zero_bits,
                                      SIZE_T commit_size, const LARGE_INTEGER *offset_ptr, SIZE_T *size_ptr,
                                      SECTION_INHERIT inherit, ULONG alloc_type, ULONG protect )
  {
      NTSTATUS res;
      SIZE_T mask = get_mask( 0 );
      pe_image_info_t image_info;
      LARGE_INTEGER offset;
  
      offset.QuadPart = offset_ptr ? offset_ptr->QuadPart : 0;
  
      TRACE("handle=%p process=%p addr=%p off=%x%08x size=%lx access=%x\n",
            handle, process, *addr_ptr, offset.u.HighPart, offset.u.LowPart, *size_ptr, protect );
  
      /* Check parameters */
      if (zero_bits > 21 && zero_bits < 32)
          return STATUS_INVALID_PARAMETER_4;
      if (!wine_is_64bit() && !is_wow64 && zero_bits >= 32)
          return STATUS_INVALID_PARAMETER_4;
  
      /* If both addr_ptr and zero_bits are passed, they have match */
      if (*addr_ptr && zero_bits && zero_bits < 32 &&
          (((UINT_PTR)*addr_ptr) >> (32 - zero_bits)))
          return STATUS_INVALID_PARAMETER_4;
      if (*addr_ptr && zero_bits >= 32 &&
          (((UINT_PTR)*addr_ptr) & ~zero_bits))
          return STATUS_INVALID_PARAMETER_4;
  
  #ifndef _WIN64
      if (!is_wow64 && (alloc_type & AT_ROUND_TO_PAGE))
      {
          *addr_ptr = ROUND_ADDR( *addr_ptr, page_mask );
          mask = page_mask;
      }
  #endif
  
      if ((offset.u.LowPart & mask) || (*addr_ptr && ((UINT_PTR)*addr_ptr & mask)))
          return STATUS_MAPPED_ALIGNMENT;
  
      if (process != NtCurrentProcess())
      {
          apc_call_t call;
          apc_result_t result;
  
          memset( &call, 0, sizeof(call) );
  
          call.map_view.type        = APC_MAP_VIEW;
          call.map_view.handle      = wine_server_obj_handle( handle );
          call.map_view.addr        = wine_server_client_ptr( *addr_ptr );
          call.map_view.size        = *size_ptr;
          call.map_view.offset      = offset.QuadPart;
          call.map_view.zero_bits   = zero_bits;
          call.map_view.alloc_type  = alloc_type;
          call.map_view.prot        = protect;
          res = server_queue_process_apc( process, &call, &result );
          if (res != STATUS_SUCCESS) return res;
  
          if ((NTSTATUS)result.map_view.status >= 0)
          {
              *addr_ptr = wine_server_get_ptr( result.map_view.addr );
              *size_ptr = result.map_view.size;
          }
          return result.map_view.status;
      }
  
      return virtual_map_section( handle, addr_ptr, zero_bits, commit_size,
                                  offset_ptr, size_ptr, protect, &image_info );
  }
  
  
  /***********************************************************************
   *             NtUnmapViewOfSection   (NTDLL.@)
   *             ZwUnmapViewOfSection   (NTDLL.@)
   */
  NTSTATUS WINAPI NtUnmapViewOfSection( HANDLE process, PVOID addr )
  {
      struct file_view *view;
      NTSTATUS status = STATUS_NOT_MAPPED_VIEW;
      sigset_t sigset;
  
      if (process != NtCurrentProcess())
      {
          apc_call_t call;
          apc_result_t result;
  
          memset( &call, 0, sizeof(call) );
  
          call.unmap_view.type = APC_UNMAP_VIEW;
          call.unmap_view.addr = wine_server_client_ptr( addr );
          status = server_queue_process_apc( process, &call, &result );
          if (status == STATUS_SUCCESS) status = result.unmap_view.status;
          return status;
      }
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
      if ((view = VIRTUAL_FindView( addr, 0 )) && !is_view_valloc( view ))
      {
          if (!(view->protect & VPROT_SYSTEM))
          {
              SERVER_START_REQ( unmap_view )
              {
                  req->base = wine_server_client_ptr( view->base );
                  status = wine_server_call( req );
              }
              SERVER_END_REQ;
              if (!status) delete_view( view );
              else FIXME( "failed to unmap %p %x\n", view->base, status );
          }
          else
          {
              delete_view( view );
              status = STATUS_SUCCESS;
          }
      }
      server_leave_uninterrupted_section( &csVirtual, &sigset );
      return status;
  }
  
  
  /******************************************************************************
   *             virtual_fill_image_information
   *
   * Helper for NtQuerySection.
   */
  void virtual_fill_image_information( const pe_image_info_t *pe_info, SECTION_IMAGE_INFORMATION *info )
  {
      info->TransferAddress      = wine_server_get_ptr( pe_info->entry_point );
      info->ZeroBits             = pe_info->zerobits;
      info->MaximumStackSize     = pe_info->stack_size;
      info->CommittedStackSize   = pe_info->stack_commit;
      info->SubSystemType        = pe_info->subsystem;
      info->SubsystemVersionLow  = pe_info->subsystem_low;
      info->SubsystemVersionHigh = pe_info->subsystem_high;
      info->GpValue              = pe_info->gp;
      info->ImageCharacteristics = pe_info->image_charact;
      info->DllCharacteristics   = pe_info->dll_charact;
      info->Machine              = pe_info->machine;
      info->ImageContainsCode    = pe_info->contains_code;
      info->u.ImageFlags         = pe_info->image_flags & ~(IMAGE_FLAGS_WineBuiltin|IMAGE_FLAGS_WineFakeDll);
      info->LoaderFlags          = pe_info->loader_flags;
      info->ImageFileSize        = pe_info->file_size;
      info->CheckSum             = pe_info->checksum;
  #ifndef _WIN64 /* don't return 64-bit values to 32-bit processes */
      if (pe_info->machine == IMAGE_FILE_MACHINE_AMD64 || pe_info->machine == IMAGE_FILE_MACHINE_ARM64)
      {
          info->TransferAddress = (void *)0x81231234;  /* sic */
          info->MaximumStackSize = 0x100000;
          info->CommittedStackSize = 0x10000;
      }
  #endif
  }
  
  /******************************************************************************
   *             NtQuerySection   (NTDLL.@)
   *             ZwQuerySection   (NTDLL.@)
   */
  NTSTATUS WINAPI NtQuerySection( HANDLE handle, SECTION_INFORMATION_CLASS class, void *ptr,
                                  SIZE_T size, SIZE_T *ret_size )
  {
      NTSTATUS status;
      pe_image_info_t image_info;
  
      switch (class)
      {
      case SectionBasicInformation:
          if (size < sizeof(SECTION_BASIC_INFORMATION)) return STATUS_INFO_LENGTH_MISMATCH;
          break;
      case SectionImageInformation:
          if (size < sizeof(SECTION_IMAGE_INFORMATION)) return STATUS_INFO_LENGTH_MISMATCH;
          break;
      default:
  	FIXME( "class %u not implemented\n", class );
  	return STATUS_NOT_IMPLEMENTED;
      }
      if (!ptr) return STATUS_ACCESS_VIOLATION;
  
      SERVER_START_REQ( get_mapping_info )
      {
          req->handle = wine_server_obj_handle( handle );
          req->access = SECTION_QUERY;
          wine_server_set_reply( req, &image_info, sizeof(image_info) );
          if (!(status = wine_server_call( req )))
          {
              if (class == SectionBasicInformation)
              {
                  SECTION_BASIC_INFORMATION *info = ptr;
                  info->Attributes    = reply->flags;
                  info->BaseAddress   = NULL;
                  info->Size.QuadPart = reply->size;
                  if (ret_size) *ret_size = sizeof(*info);
              }
              else if (reply->flags & SEC_IMAGE)
              {
                  SECTION_IMAGE_INFORMATION *info = ptr;
                  virtual_fill_image_information( &image_info, info );
                  if (ret_size) *ret_size = sizeof(*info);
              }
              else status = STATUS_SECTION_NOT_IMAGE;
          }
      }
      SERVER_END_REQ;
  
      return status;
  }
  
  
  /***********************************************************************
   *             NtFlushVirtualMemory   (NTDLL.@)
   *             ZwFlushVirtualMemory   (NTDLL.@)
   */
  NTSTATUS WINAPI NtFlushVirtualMemory( HANDLE process, LPCVOID *addr_ptr,
                                        SIZE_T *size_ptr, ULONG unknown )
  {
      struct file_view *view;
      NTSTATUS status = STATUS_SUCCESS;
      sigset_t sigset;
      void *addr = ROUND_ADDR( *addr_ptr, page_mask );
  
      if (process != NtCurrentProcess())
      {
          apc_call_t call;
          apc_result_t result;
  
          memset( &call, 0, sizeof(call) );
  
          call.virtual_flush.type = APC_VIRTUAL_FLUSH;
          call.virtual_flush.addr = wine_server_client_ptr( addr );
          call.virtual_flush.size = *size_ptr;
          status = server_queue_process_apc( process, &call, &result );
          if (status != STATUS_SUCCESS) return status;
  
          if (result.virtual_flush.status == STATUS_SUCCESS)
          {
              *addr_ptr = wine_server_get_ptr( result.virtual_flush.addr );
              *size_ptr = result.virtual_flush.size;
          }
          return result.virtual_flush.status;
      }
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
      if (!(view = VIRTUAL_FindView( addr, *size_ptr ))) status = STATUS_INVALID_PARAMETER;
      else
      {
          if (!*size_ptr) *size_ptr = view->size;
          *addr_ptr = addr;
  #ifdef MS_ASYNC
          if (msync( addr, *size_ptr, MS_ASYNC )) status = STATUS_NOT_MAPPED_DATA;
  #endif
      }
      server_leave_uninterrupted_section( &csVirtual, &sigset );
      return status;
  }
  
  
  /***********************************************************************
   *             NtGetWriteWatch   (NTDLL.@)
   *             ZwGetWriteWatch   (NTDLL.@)
   */
  NTSTATUS WINAPI NtGetWriteWatch( HANDLE process, ULONG flags, PVOID base, SIZE_T size, PVOID *addresses,
                                   ULONG_PTR *count, ULONG *granularity )
  {
      NTSTATUS status = STATUS_SUCCESS;
      sigset_t sigset;
  
      size = ROUND_SIZE( base, size );
      base = ROUND_ADDR( base, page_mask );
  
      if (!count || !granularity) return STATUS_ACCESS_VIOLATION;
      if (!*count || !size) return STATUS_INVALID_PARAMETER;
      if (flags & ~WRITE_WATCH_FLAG_RESET) return STATUS_INVALID_PARAMETER;
  
      if (!addresses) return STATUS_ACCESS_VIOLATION;
  
      TRACE( "%p %x %p-%p %p %lu\n", process, flags, base, (char *)base + size,
             addresses, *count );
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
  
      if (is_write_watch_range( base, size ))
      {
          ULONG_PTR pos = 0;
          char *addr = base;
          char *end = addr + size;
  
          while (pos < *count && addr < end)
          {
              if (!(get_page_vprot( addr ) & VPROT_WRITEWATCH)) addresses[pos++] = addr;
              addr += page_size;
          }
          if (flags & WRITE_WATCH_FLAG_RESET) reset_write_watches( base, addr - (char *)base );
          *count = pos;
          *granularity = page_size;
      }
      else status = STATUS_INVALID_PARAMETER;
  
      server_leave_uninterrupted_section( &csVirtual, &sigset );
      return status;
  }
  
  
  /***********************************************************************
   *             NtResetWriteWatch   (NTDLL.@)
   *             ZwResetWriteWatch   (NTDLL.@)
   */
  NTSTATUS WINAPI NtResetWriteWatch( HANDLE process, PVOID base, SIZE_T size )
  {
      NTSTATUS status = STATUS_SUCCESS;
      sigset_t sigset;
  
      size = ROUND_SIZE( base, size );
      base = ROUND_ADDR( base, page_mask );
  
      TRACE( "%p %p-%p\n", process, base, (char *)base + size );
  
      if (!size) return STATUS_INVALID_PARAMETER;
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
  
      if (is_write_watch_range( base, size ))
          reset_write_watches( base, size );
      else
          status = STATUS_INVALID_PARAMETER;
  
      server_leave_uninterrupted_section( &csVirtual, &sigset );
      return status;
  }
  
  
  /***********************************************************************
   *             NtReadVirtualMemory   (NTDLL.@)
   *             ZwReadVirtualMemory   (NTDLL.@)
   */
  NTSTATUS WINAPI NtReadVirtualMemory( HANDLE process, const void * HOSTPTR addr, void *buffer,
                                       SIZE_T size, SIZE_T *bytes_read )
  #ifdef __i386_on_x86_64__
  __attribute__((overloadable))
  #endif
  {
      NTSTATUS status;
  
      if (virtual_check_buffer_for_write( buffer, size ))
      {
          SERVER_START_REQ( read_process_memory )
          {
              req->handle = wine_server_obj_handle( process );
              req->addr   = wine_server_client_ptr( addr );
              wine_server_set_reply( req, buffer, size );
              if ((status = wine_server_call( req ))) size = 0;
          }
          SERVER_END_REQ;
      }
      else
      {
          status = STATUS_ACCESS_VIOLATION;
          size = 0;
      }
      if (bytes_read) *bytes_read = size;
      return status;
  }
  
  #ifdef __i386_on_x86_64__
  NTSTATUS WINAPI NtReadVirtualMemory( HANDLE process, const void *addr, void *buffer,
                                       SIZE_T size, SIZE_T *bytes_read )
  {
      return NtReadVirtualMemory(process, (const void *HOSTPTR)addr, buffer, size, bytes_read);
  }
  #endif
  
  
  /***********************************************************************
   *             NtWriteVirtualMemory   (NTDLL.@)
   *             ZwWriteVirtualMemory   (NTDLL.@)
   */
  NTSTATUS WINAPI NtWriteVirtualMemory( HANDLE process, void *addr, const void *buffer,
                                        SIZE_T size, SIZE_T *bytes_written )
  {
      NTSTATUS status;
  
      if (virtual_check_buffer_for_read( buffer, size ))
      {
          SERVER_START_REQ( write_process_memory )
          {
              req->handle     = wine_server_obj_handle( process );
              req->addr       = wine_server_client_ptr( addr );
              wine_server_add_data( req, buffer, size );
              if ((status = wine_server_call( req ))) size = 0;
          }
          SERVER_END_REQ;
      }
      else
      {
          status = STATUS_PARTIAL_COPY;
          size = 0;
      }
      if (bytes_written) *bytes_written = size;
      return status;
  }
  
  
  /***********************************************************************
   *             NtAreMappedFilesTheSame   (NTDLL.@)
   *             ZwAreMappedFilesTheSame   (NTDLL.@)
   */
  NTSTATUS WINAPI NtAreMappedFilesTheSame(PVOID addr1, PVOID addr2)
  {
      struct file_view *view1, *view2;
      NTSTATUS status;
      sigset_t sigset;
  
      TRACE("%p %p\n", addr1, addr2);
  
      server_enter_uninterrupted_section( &csVirtual, &sigset );
  
      view1 = VIRTUAL_FindView( addr1, 0 );
      view2 = VIRTUAL_FindView( addr2, 0 );
  
      if (!view1 || !view2)
          status = STATUS_INVALID_ADDRESS;
      else if (is_view_valloc( view1 ) || is_view_valloc( view2 ))
          status = STATUS_CONFLICTING_ADDRESSES;
      else if (view1 == view2)
          status = STATUS_SUCCESS;
      else if ((view1->protect & VPROT_SYSTEM) || (view2->protect & VPROT_SYSTEM))
          status = STATUS_NOT_SAME_DEVICE;
      else
      {
          SERVER_START_REQ( is_same_mapping )
          {
              req->base1 = wine_server_client_ptr( view1->base );
              req->base2 = wine_server_client_ptr( view2->base );
              status = wine_server_call( req );
          }
          SERVER_END_REQ;
      }
  
      server_leave_uninterrupted_section( &csVirtual, &sigset );
      return status;
  }
  