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virtual.c
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virtual.c
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/*
* 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_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
#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"
#include "wine/list.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 */
struct file_view
{
struct list entry; /* Entry in global view list */
void *base; /* Base address */
size_t size; /* Size in bytes */
HANDLE mapping; /* Handle to the file mapping */
unsigned int map_protect; /* Mapping protection */
unsigned int protect; /* Protection for all pages at allocation time */
BYTE prot[1]; /* Protection byte for each page */
};
/* 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 list views_list = LIST_INIT(views_list);
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 };
#ifdef __i386__
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 */
#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;
#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 const BOOL is_win64 = (sizeof(void *) > sizeof(int));
#define ROUND_ADDR(addr,mask) \
((void *)((UINT_PTR)(addr) & ~(UINT_PTR)(mask)))
#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)
#define VIRTUAL_HEAP_SIZE (sizeof(void*)*1024*1024)
static HANDLE virtual_heap;
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 */
/***********************************************************************
* 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 = view->prot[0];
TRACE( "View: %p - %p", addr, addr + view->size - 1 );
if (view->protect & VPROT_SYSTEM)
TRACE( " (system)\n" );
else if (view->protect & VPROT_VALLOC)
TRACE( " (valloc)\n" );
else if (view->mapping)
TRACE( " %p\n", view->mapping );
else
TRACE( " (anonymous)\n");
for (count = i = 1; i < view->size >> page_shift; i++, count++)
{
if (view->prot[i] == prot) continue;
TRACE( " %p - %p %s\n",
addr, addr + (count << page_shift) - 1, VIRTUAL_GetProtStr(prot) );
addr += (count << page_shift);
prot = view->prot[i];
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 );
LIST_FOR_EACH_ENTRY( view, &views_list, 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 file_view *view;
LIST_FOR_EACH_ENTRY( view, &views_list, struct file_view, entry )
{
if (view->base > addr) break; /* no matching view */
if ((const char *)view->base + view->size <= (const char *)addr) continue;
if ((const char *)view->base + view->size < (const char *)addr + size) break; /* size too large */
if ((const char *)addr + size < (const char *)addr) break; /* overflow */
return view;
}
return NULL;
}
/***********************************************************************
* get_mask
*/
static inline UINT_PTR get_mask( ULONG zero_bits )
{
if (!zero_bits) return 0xffff; /* allocations are aligned to 64K by default */
if (zero_bits < page_shift) zero_bits = page_shift;
return (1 << zero_bits) - 1;
}
/***********************************************************************
* 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 *addr, size_t size )
{
struct file_view *view;
LIST_FOR_EACH_ENTRY( view, &views_list, struct file_view, entry )
{
if ((const char *)view->base >= (const char *)addr + size) break;
if ((const char *)view->base + view->size > (const char *)addr) 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 *find_free_area( void *base, void *end, size_t size, size_t mask, int top_down )
{
struct list *ptr;
void *start;
if (top_down)
{
start = ROUND_ADDR( (char *)end - size, mask );
if (start >= end || start < base) return NULL;
for (ptr = views_list.prev; ptr != &views_list; ptr = ptr->prev)
{
struct file_view *view = LIST_ENTRY( ptr, struct file_view, entry );
if ((char *)view->base + view->size <= (char *)start) break;
if ((char *)view->base >= (char *)start + size) continue;
start = ROUND_ADDR( (char *)view->base - size, mask );
/* stop if remaining space is not large enough */
if (!start || start >= end || start < base) return NULL;
}
}
else
{
start = ROUND_ADDR( (char *)base + mask, mask );
if (start >= end || (char *)end - (char *)start < size) return NULL;
for (ptr = views_list.next; ptr != &views_list; ptr = ptr->next)
{
struct file_view *view = LIST_ENTRY( ptr, struct file_view, entry );
if ((char *)view->base >= (char *)start + size) break;
if ((char *)view->base + view->size <= (char *)start) continue;
start = ROUND_ADDR( (char *)view->base + view->size + mask, mask );
/* stop if remaining space is not large enough */
if (!start || start >= end || (char *)end - (char *)start < size) return NULL;
}
}
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 *addr, size_t size )
{
TRACE( "adding %p-%p\n", addr, (char *)addr + size );
if (addr < user_space_limit)
{
/* unmap the part of the area that is below the limit */
assert( (char *)addr + size > (char *)user_space_limit );
munmap( addr, (char *)user_space_limit - (char *)addr );
size -= (char *)user_space_limit - (char *)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 *addr, size_t size )
{
struct file_view *view;
TRACE( "removing %p-%p\n", addr, (char *)addr + size );
wine_mmap_remove_reserved_area( addr, size, 0 );
/* unmap areas not covered by an existing view */
LIST_FOR_EACH_ENTRY( view, &views_list, struct file_view, entry )
{
if ((char *)view->base >= (char *)addr + size)
{
munmap( addr, size );
break;
}
if ((char *)view->base + view->size <= (char *)addr) continue;
if (view->base > addr) munmap( addr, (char *)view->base - (char *)addr );
if ((char *)view->base + view->size > (char *)addr + size) break;
size = (char *)addr + size - ((char *)view->base + view->size);
addr = (char *)view->base + view->size;
}
}
/***********************************************************************
* is_beyond_limit
*
* Check if an address range goes beyond a given limit.
*/
static inline BOOL is_beyond_limit( const void *addr, size_t size, const void *limit )
{
return (addr >= limit || (const char *)addr + size > (const char *)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 *addr, size_t size )
{
if (wine_mmap_is_in_reserved_area( addr, size ))
wine_anon_mmap( addr, size, PROT_NONE, MAP_NORESERVE | MAP_FIXED );
else if (is_beyond_limit( addr, size, user_space_limit ))
add_reserved_area( addr, size );
else
munmap( addr, size );
}
/***********************************************************************
* 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 );
list_remove( &view->entry );
if (view->mapping) close_handle( view->mapping );
RtlFreeHeap( virtual_heap, 0, 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;
struct list *ptr;
int unix_prot = VIRTUAL_GetUnixProt( vprot );
assert( !((UINT_PTR)base & page_mask) );
assert( !(size & page_mask) );
/* Create the view structure */
if (!(view = RtlAllocateHeap( virtual_heap, 0, sizeof(*view) + (size >> page_shift) - 1 )))
{
FIXME( "out of memory in virtual heap for %p-%p\n", base, (char *)base + size );
return STATUS_NO_MEMORY;
}
view->base = base;
view->size = size;
view->mapping = 0;
view->map_protect = 0;
view->protect = vprot;
memset( view->prot, vprot, size >> page_shift );
/* Insert it in the linked list */
LIST_FOR_EACH( ptr, &views_list )
{
struct file_view *next = LIST_ENTRY( ptr, struct file_view, entry );
if (next->base > base) break;
}
list_add_before( ptr, &view->entry );
/* 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. */
if ((ptr = list_prev( &views_list, &view->entry )) != NULL)
{
struct file_view *prev = LIST_ENTRY( ptr, struct file_view, entry );
if ((char *)prev->base + prev->size > (char *)base)
{
TRACE( "overlapping prev view %p-%p for %p-%p\n",
prev->base, (char *)prev->base + prev->size,
base, (char *)base + view->size );
assert( prev->protect & VPROT_SYSTEM );
delete_view( prev );
}
}
if ((ptr = list_next( &views_list, &view->entry )) != NULL)
{
struct file_view *next = LIST_ENTRY( ptr, struct file_view, entry );
if ((char *)base + view->size > (char *)next->base)
{
TRACE( "overlapping next view %p-%p for %p-%p\n",
next->base, (char *)next->base + next->size,
base, (char *)base + view->size );
assert( next->protect & VPROT_SYSTEM );
delete_view( next );
}
}
*view_ret = view;
VIRTUAL_DEBUG_DUMP_VIEW( view );
if (force_exec_prot && !(vprot & VPROT_NOEXEC) && (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 )
{
DWORD ret = VIRTUAL_Win32Flags[vprot & 0x0f];
if (vprot & VPROT_NOCACHE) ret |= PAGE_NOCACHE;
if (vprot & VPROT_GUARD) ret |= PAGE_GUARD;
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;
if (protect & PAGE_NOCACHE) *vprot |= VPROT_NOCACHE;
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, unsigned int view_protect )
{
if (force_exec_prot && !(view_protect & VPROT_NOEXEC) &&
(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 );
}
/***********************************************************************
* 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);
BYTE *p = view->prot + (((char *)base - (char *)view->base) >> page_shift);
TRACE("%p-%p %s\n",
base, (char *)base + size - 1, VIRTUAL_GetProtStr( vprot ) );
if (view->protect & VPROT_WRITEWATCH)
{
/* each page may need different protections depending on write watch flag */
UINT i, count;
char *addr = base;
int prot;
p[0] = vprot | (p[0] & VPROT_WRITEWATCH);
unix_prot = VIRTUAL_GetUnixProt( p[0] );
for (count = i = 1; i < size >> page_shift; i++, count++)
{
p[i] = vprot | (p[i] & VPROT_WRITEWATCH);
prot = VIRTUAL_GetUnixProt( p[i] );
if (prot == unix_prot) continue;
mprotect_exec( addr, count << page_shift, unix_prot, view->protect );
addr += count << page_shift;
unix_prot = prot;
count = 0;
}
if (count) mprotect_exec( addr, count << page_shift, unix_prot, view->protect );
VIRTUAL_DEBUG_DUMP_VIEW( view );
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))
{
memset( p, vprot, size >> page_shift );
mprotect( base, size, unix_prot );
VIRTUAL_DEBUG_DUMP_VIEW( view );
return TRUE;
}
if (mprotect_exec( base, size, unix_prot, view->protect )) /* FIXME: last error */
return FALSE;
memset( p, vprot, size >> page_shift );
VIRTUAL_DEBUG_DUMP_VIEW( view );
return TRUE;
}
/***********************************************************************
* reset_write_watches
*
* Reset write watches in a memory range.
*/
static void reset_write_watches( struct file_view *view, void *base, SIZE_T size )
{
SIZE_T i, count;
int prot, unix_prot;
char *addr = base;
BYTE *p = view->prot + ((addr - (char *)view->base) >> page_shift);
p[0] |= VPROT_WRITEWATCH;
unix_prot = VIRTUAL_GetUnixProt( p[0] );
for (count = i = 1; i < size >> page_shift; i++, count++)
{
p[i] |= VPROT_WRITEWATCH;
prot = VIRTUAL_GetUnixProt( p[i] );
if (prot == unix_prot) continue;
mprotect_exec( addr, count << page_shift, unix_prot, view->protect );
addr += count << page_shift;
unix_prot = prot;
count = 0;
}
if (count) mprotect_exec( addr, count << page_shift, unix_prot, view->protect );
}
/***********************************************************************
* unmap_extra_space
*
* Release the extra memory while keeping the range starting on the granularity boundary.
*/
static inline void *unmap_extra_space( void *ptr, size_t total_size, size_t wanted_size, size_t mask )
{
if ((ULONG_PTR)ptr & mask)
{
size_t extra = mask + 1 - ((ULONG_PTR)ptr & mask);
munmap( ptr, extra );
ptr = (char *)ptr + extra;
total_size -= extra;
}
if (total_size > wanted_size)
munmap( (char *)ptr + wanted_size, total_size - wanted_size );
return ptr;
}
struct alloc_area
{
size_t size;
size_t mask;
int top_down;
void *limit;
void *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 *start, size_t size, void *arg )
{
struct alloc_area *alloc = arg;
void *end = (char *)start + size;
if (start < address_space_start) start = address_space_start;
if (is_beyond_limit( start, size, alloc->limit )) end = alloc->limit;
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;
}
/***********************************************************************
* 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 mask,
int top_down, unsigned int vprot )
{
void *ptr;
NTSTATUS status;
if (base)
{
if (is_beyond_limit( base, size, address_space_limit ))
return STATUS_WORKING_SET_LIMIT_RANGE;
switch (wine_mmap_is_in_reserved_area( base, size ))
{
case -1: /* partially in a reserved area */
return STATUS_CONFLICTING_ADDRESSES;
case 0: /* not in a reserved area, do a normal allocation */
if ((ptr = wine_anon_mmap( base, size, VIRTUAL_GetUnixProt(vprot), 0 )) == (void *)-1)
{
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;
}
else
{
size_t view_size = size + mask + 1;
struct alloc_area alloc;
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 *)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 )) == (void *)-1)
{
if (errno == ENOMEM) return STATUS_NO_MEMORY;
return STATUS_INVALID_PARAMETER;
}
TRACE( "got mem with anon mmap %p-%p\n", ptr, (char *)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, 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 *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_NOEXEC) && (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))
{
if (mmap( (char *)view->base + start, size, prot, flags, fd, offset ) != (void *)-1)
goto done;
if ((errno == EPERM) && (prot & PROT_EXEC))
ERR( "failed to set %08x protection on file map, noexec filesystem?\n", prot );
/* mmap() failed; if this is because the file offset is not */
/* page-aligned (EINVAL), or because the underlying filesystem */
/* does not support mmap() (ENOEXEC,ENODEV), we do it by hand. */
if ((errno != ENOEXEC) && (errno != EINVAL) && (errno != ENODEV)) return FILE_GetNtStatus();
if (flags & MAP_SHARED) /* we cannot fake shared mappings */
{
if (errno == EINVAL) return STATUS_INVALID_PARAMETER;
ERR( "shared writable mmap not supported, broken filesystem?\n" );
return STATUS_NOT_SUPPORTED;
}
}
/* Reserve the memory with an anonymous mmap */
ptr = wine_anon_mmap( (char *)view->base + start, size, PROT_READ | PROT_WRITE, MAP_FIXED );
if (ptr == (void *)-1) 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:
memset( view->prot + (start >> page_shift), vprot, ROUND_SIZE(start,size) >> page_shift );
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 = view->prot[start];
if (view->mapping && !(view->protect & VPROT_COMMITTED))
{
SIZE_T ret = 0;
SERVER_START_REQ( get_mapping_committed_range )
{
req->handle = wine_server_obj_handle( view->mapping );
req->offset = start << page_shift;
if (!wine_server_call( req ))
{
ret = reply->size;
if (reply->committed)
{
*vprot |= VPROT_COMMITTED;
for (i = 0; i < ret >> page_shift; i++) view->prot[start+i] |= VPROT_COMMITTED;
}
}
}
SERVER_END_REQ;
return ret;
}
for (i = start + 1; i < view->size >> page_shift; i++)
if ((*vprot ^ view->prot[i]) & 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 ) != (void *)-1)
{
BYTE *p = view->prot + (start >> page_shift);
size >>= page_shift;
while (size--) *p++ &= ~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 *addr = NULL;
void * const low_64k = (void *)0x10000;
const size_t dosmem_size = 0x110000;
int unix_prot = VIRTUAL_GetUnixProt( vprot );
struct list *ptr;
/* check for existing view */
if ((ptr = list_head( &views_list )))
{
struct file_view *first_view = LIST_ENTRY( ptr, struct file_view, entry );
if (first_view->base < (void *)dosmem_size) return STATUS_CONFLICTING_ADDRESSES;
}
/* check without the first 64K */
if (wine_mmap_is_in_reserved_area( low_64k, dosmem_size - 0x10000 ) != 1)