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Sweden-Number/memory/virtual.c

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/*
* Win32 virtual memory functions
*
* Copyright 1997 Alexandre Julliard
*/
#include <assert.h>
#include <errno.h>
#include <sys/errno.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/mman.h>
#include "winbase.h"
#include "winerror.h"
#include "file.h"
#include "heap.h"
#include "process.h"
#include "xmalloc.h"
#include "global.h"
#include "server.h"
#include "debug.h"
DEFAULT_DEBUG_CHANNEL(virtual)
#ifndef MS_SYNC
#define MS_SYNC 0
#endif
/* File view */
typedef struct _FV
{
struct _FV *next; /* Next view */
struct _FV *prev; /* Prev view */
UINT base; /* Base address */
UINT size; /* Size in bytes */
UINT flags; /* Allocation flags */
UINT offset; /* Offset from start of mapped file */
HANDLE mapping; /* Handle to the file mapping */
HANDLERPROC handlerProc; /* Fault handler */
LPVOID handlerArg; /* Fault handler argument */
BYTE protect; /* Protection for all pages at allocation time */
BYTE prot[1]; /* Protection byte for each page */
} FILE_VIEW;
/* Per-view flags */
#define VFLAG_SYSTEM 0x01
/* 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 FILE_VIEW *VIRTUAL_FirstView;
#ifdef __i386__
/* These are always the same on an i386, and it will be faster this way */
# define page_mask 0xfff
# define page_shift 12
# define granularity_mask 0xffff
#else
static UINT page_shift;
static UINT page_mask;
static UINT granularity_mask; /* Allocation granularity (usually 64k) */
#endif /* __i386__ */
#define ROUND_ADDR(addr) \
((UINT)(addr) & ~page_mask)
#define ROUND_SIZE(addr,size) \
(((UINT)(size) + ((UINT)(addr) & page_mask) + page_mask) & ~page_mask)
#define VIRTUAL_DEBUG_DUMP_VIEW(view) \
if (!TRACE_ON(virtual)); else VIRTUAL_DumpView(view)
/***********************************************************************
* 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' : '-';
buffer[2] = (prot & VPROT_READ) ? 'r' : '-';
buffer[3] = (prot & VPROT_WRITE) ?
((prot & VPROT_WRITECOPY) ? 'w' : 'W') : '-';
buffer[4] = (prot & VPROT_EXEC) ? 'x' : '-';
buffer[5] = 0;
return buffer;
}
/***********************************************************************
* VIRTUAL_DumpView
*/
static void VIRTUAL_DumpView( FILE_VIEW *view )
{
UINT i, count;
UINT addr = view->base;
BYTE prot = view->prot[0];
DUMP( "View: %08x - %08x%s",
view->base, view->base + view->size - 1,
(view->flags & VFLAG_SYSTEM) ? " (system)" : "" );
if (view->mapping)
DUMP( " %d @ %08x\n", view->mapping, view->offset );
else
DUMP( " (anonymous)\n");
for (count = i = 1; i < view->size >> page_shift; i++, count++)
{
if (view->prot[i] == prot) continue;
DUMP( " %08x - %08x %s\n",
addr, addr + (count << page_shift) - 1,
VIRTUAL_GetProtStr(prot) );
addr += (count << page_shift);
prot = view->prot[i];
count = 0;
}
if (count)
DUMP( " %08x - %08x %s\n",
addr, addr + (count << page_shift) - 1,
VIRTUAL_GetProtStr(prot) );
}
/***********************************************************************
* VIRTUAL_Dump
*/
void VIRTUAL_Dump(void)
{
FILE_VIEW *view = VIRTUAL_FirstView;
DUMP( "\nDump of all virtual memory views:\n\n" );
while (view)
{
VIRTUAL_DumpView( view );
view = view->next;
}
}
/***********************************************************************
* VIRTUAL_FindView
*
* Find the view containing a given address.
*
* RETURNS
* View: Success
* NULL: Failure
*/
static FILE_VIEW *VIRTUAL_FindView(
UINT addr /* [in] Address */
) {
FILE_VIEW *view = VIRTUAL_FirstView;
while (view)
{
if (view->base > addr) return NULL;
if (view->base + view->size > addr) return view;
view = view->next;
}
return NULL;
}
/***********************************************************************
* VIRTUAL_CreateView
*
* Create a new view and add it in the linked list.
*/
static FILE_VIEW *VIRTUAL_CreateView( UINT base, UINT size, UINT offset,
UINT flags, BYTE vprot,
HANDLE mapping )
{
FILE_VIEW *view, *prev;
/* Create the view structure */
assert( !(base & page_mask) );
assert( !(size & page_mask) );
size >>= page_shift;
if (!(view = (FILE_VIEW *)malloc( sizeof(*view) + size - 1 ))) return NULL;
view->base = base;
view->size = size << page_shift;
view->flags = flags;
view->offset = offset;
view->mapping = mapping;
view->protect = vprot;
view->handlerProc = NULL;
memset( view->prot, vprot, size );
/* Duplicate the mapping handle */
if ((view->mapping != -1) &&
!DuplicateHandle( GetCurrentProcess(), view->mapping,
GetCurrentProcess(), &view->mapping,
0, FALSE, DUPLICATE_SAME_ACCESS ))
{
free( view );
return NULL;
}
/* Insert it in the linked list */
if (!VIRTUAL_FirstView || (VIRTUAL_FirstView->base > base))
{
view->next = VIRTUAL_FirstView;
view->prev = NULL;
if (view->next) view->next->prev = view;
VIRTUAL_FirstView = view;
}
else
{
prev = VIRTUAL_FirstView;
while (prev->next && (prev->next->base < base)) prev = prev->next;
view->next = prev->next;
view->prev = prev;
if (view->next) view->next->prev = view;
prev->next = view;
}
VIRTUAL_DEBUG_DUMP_VIEW( view );
return view;
}
/***********************************************************************
* VIRTUAL_DeleteView
* Deletes a view.
*
* RETURNS
* None
*/
static void VIRTUAL_DeleteView(
FILE_VIEW *view /* [in] View */
) {
FILE_munmap( (void *)view->base, 0, view->size );
if (view->next) view->next->prev = view->prev;
if (view->prev) view->prev->next = view->next;
else VIRTUAL_FirstView = view->next;
if (view->mapping) CloseHandle( view->mapping );
free( view );
}
/***********************************************************************
* 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;
if (vprot & VPROT_EXEC) prot |= PROT_EXEC;
}
return prot;
}
/***********************************************************************
* VIRTUAL_GetWin32Prot
*
* Convert page protections to Win32 flags.
*
* RETURNS
* None
*/
static void VIRTUAL_GetWin32Prot(
BYTE vprot, /* [in] Page protection flags */
DWORD *protect, /* [out] Location to store Win32 protection flags */
DWORD *state /* [out] Location to store mem state flag */
) {
if (protect) {
*protect = VIRTUAL_Win32Flags[vprot & 0x0f];
/* if (vprot & VPROT_GUARD) *protect |= PAGE_GUARD;*/
if (vprot & VPROT_NOCACHE) *protect |= PAGE_NOCACHE;
if (vprot & VPROT_GUARD) *protect = PAGE_NOACCESS;
}
if (state) *state = (vprot & VPROT_COMMITTED) ? MEM_COMMIT : MEM_RESERVE;
}
/***********************************************************************
* VIRTUAL_GetProt
*
* Build page protections from Win32 flags.
*
* RETURNS
* Value of page protection flags
*/
static BYTE VIRTUAL_GetProt(
DWORD protect /* [in] Win32 protection flags */
) {
BYTE vprot;
switch(protect & 0xff)
{
case PAGE_READONLY:
vprot = VPROT_READ;
break;
case PAGE_READWRITE:
vprot = VPROT_READ | VPROT_WRITE;
break;
case PAGE_WRITECOPY:
vprot = VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
break;
case PAGE_EXECUTE:
vprot = VPROT_EXEC;
break;
case PAGE_EXECUTE_READ:
vprot = VPROT_EXEC | VPROT_READ;
break;
case PAGE_EXECUTE_READWRITE:
vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE | VPROT_WRITECOPY;
break;
case PAGE_EXECUTE_WRITECOPY:
vprot = VPROT_EXEC | VPROT_READ | VPROT_WRITE;
break;
case PAGE_NOACCESS:
default:
vprot = 0;
break;
}
if (protect & PAGE_GUARD) vprot |= VPROT_GUARD;
if (protect & PAGE_NOCACHE) vprot |= VPROT_NOCACHE;
return vprot;
}
/***********************************************************************
* VIRTUAL_SetProt
*
* Change the protection of a range of pages.
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
static BOOL VIRTUAL_SetProt(
FILE_VIEW *view, /* [in] Pointer to view */
UINT base, /* [in] Starting address */
UINT size, /* [in] Size in bytes */
BYTE vprot /* [in] Protections to use */
) {
TRACE(virtual, "%08x-%08x %s\n",
base, base + size - 1, VIRTUAL_GetProtStr( vprot ) );
if (mprotect( (void *)base, size, VIRTUAL_GetUnixProt(vprot) ))
return FALSE; /* FIXME: last error */
memset( view->prot + ((base - view->base) >> page_shift),
vprot, size >> page_shift );
VIRTUAL_DEBUG_DUMP_VIEW( view );
return TRUE;
}
/***********************************************************************
* VIRTUAL_CheckFlags
*
* Check that all pages in a range have the given flags.
*
* RETURNS
* TRUE: They do
* FALSE: They do not
*/
static BOOL VIRTUAL_CheckFlags(
UINT base, /* [in] Starting address */
UINT size, /* [in] Size in bytes */
BYTE flags /* [in] Flags to check for */
) {
FILE_VIEW *view;
UINT page;
if (!size) return TRUE;
if (!(view = VIRTUAL_FindView( base ))) return FALSE;
if (view->base + view->size < base + size) return FALSE;
page = (base - view->base) >> page_shift;
size = ROUND_SIZE( base, size ) >> page_shift;
while (size--) if ((view->prot[page++] & flags) != flags) return FALSE;
return TRUE;
}
/***********************************************************************
* VIRTUAL_Init
*/
BOOL VIRTUAL_Init(void)
{
#ifndef __i386__
DWORD page_size;
# ifdef HAVE_GETPAGESIZE
page_size = getpagesize();
# else
# ifdef __svr4__
page_size = sysconf(_SC_PAGESIZE);
# else
# error Cannot get the page size on this platform
# endif
# endif
page_mask = page_size - 1;
granularity_mask = 0xffff; /* hard-coded for now */
/* Make sure we have a power of 2 */
assert( !(page_size & page_mask) );
page_shift = 0;
while ((1 << page_shift) != page_size) page_shift++;
#endif /* !__i386__ */
#ifdef linux
{
/* Do not use stdio here since it may temporarily change the size
* of some segments (ie libc6 adds 0x1000 per open FILE)
*/
int fd = open ("/proc/self/maps", O_RDONLY);
if (fd >= 0)
{
char buffer[512]; /* line might be rather long in 2.1 */
for (;;)
{
int start, end, offset;
char r, w, x, p;
BYTE vprot = VPROT_COMMITTED;
char * ptr = buffer;
int count = sizeof(buffer);
while (1 == read(fd, ptr, 1) && *ptr != '\n' && --count > 0)
ptr++;
if (*ptr != '\n') break;
*ptr = '\0';
sscanf( buffer, "%x-%x %c%c%c%c %x",
&start, &end, &r, &w, &x, &p, &offset );
if (r == 'r') vprot |= VPROT_READ;
if (w == 'w') vprot |= VPROT_WRITE;
if (x == 'x') vprot |= VPROT_EXEC;
if (p == 'p') vprot |= VPROT_WRITECOPY;
VIRTUAL_CreateView( start, end - start, 0,
VFLAG_SYSTEM, vprot, -1 );
}
close (fd);
}
}
#endif /* linux */
return TRUE;
}
/***********************************************************************
* VIRTUAL_GetPageSize
*/
DWORD VIRTUAL_GetPageSize(void)
{
return 1 << page_shift;
}
/***********************************************************************
* VIRTUAL_GetGranularity
*/
DWORD VIRTUAL_GetGranularity(void)
{
return granularity_mask + 1;
}
/***********************************************************************
* VIRTUAL_SetFaultHandler
*/
BOOL VIRTUAL_SetFaultHandler( LPCVOID addr, HANDLERPROC proc, LPVOID arg )
{
FILE_VIEW *view;
if (!(view = VIRTUAL_FindView((UINT)addr))) return FALSE;
view->handlerProc = proc;
view->handlerArg = arg;
return TRUE;
}
/***********************************************************************
* VIRTUAL_HandleFault
*/
BOOL VIRTUAL_HandleFault( LPCVOID addr )
{
FILE_VIEW *view = VIRTUAL_FindView((UINT)addr);
if (view && view->handlerProc)
return view->handlerProc(view->handlerArg, addr);
return FALSE;
}
/***********************************************************************
* VirtualAlloc (KERNEL32.548)
* Reserves or commits a region of pages in virtual address space
*
* RETURNS
* Base address of allocated region of pages
* NULL: Failure
*/
LPVOID WINAPI VirtualAlloc(
LPVOID addr, /* [in] Address of region to reserve or commit */
DWORD size, /* [in] Size of region */
DWORD type, /* [in] Type of allocation */
DWORD protect /* [in] Type of access protection */
) {
FILE_VIEW *view;
UINT base, ptr, view_size;
BYTE vprot;
TRACE(virtual, "%08x %08lx %lx %08lx\n",
(UINT)addr, size, type, protect );
/* Round parameters to a page boundary */
if (size > 0x7fc00000) /* 2Gb - 4Mb */
{
SetLastError( ERROR_OUTOFMEMORY );
return NULL;
}
if (addr)
{
if (type & MEM_RESERVE) /* Round down to 64k boundary */
base = ((UINT)addr + granularity_mask) & ~granularity_mask;
else
base = ROUND_ADDR( addr );
size = (((UINT)addr + size + page_mask) & ~page_mask) - base;
if (base + size < base) /* Disallow wrap-around */
{
SetLastError( ERROR_INVALID_PARAMETER );
return NULL;
}
}
else
{
base = 0;
size = (size + page_mask) & ~page_mask;
}
if (type & MEM_TOP_DOWN) {
/* FIXME: MEM_TOP_DOWN allocates the largest possible address.
* Is there _ANY_ way to do it with UNIX mmap()?
*/
WARN(virtual,"MEM_TOP_DOWN ignored\n");
type &= ~MEM_TOP_DOWN;
}
/* Compute the protection flags */
if (!(type & (MEM_COMMIT | MEM_RESERVE)) ||
(type & ~(MEM_COMMIT | MEM_RESERVE)))
{
SetLastError( ERROR_INVALID_PARAMETER );
return NULL;
}
if (type & MEM_COMMIT)
vprot = VIRTUAL_GetProt( protect ) | VPROT_COMMITTED;
else vprot = 0;
/* Reserve the memory */
if ((type & MEM_RESERVE) || !base)
{
view_size = size + (base ? 0 : granularity_mask + 1);
ptr = (UINT)FILE_dommap( -1, (LPVOID)base, 0, view_size, 0, 0,
VIRTUAL_GetUnixProt( vprot ), MAP_PRIVATE );
if (ptr == (UINT)-1)
{
SetLastError( ERROR_OUTOFMEMORY );
return NULL;
}
if (!base)
{
/* Release the extra memory while keeping the range */
/* starting on a 64k boundary. */
if (ptr & granularity_mask)
{
UINT extra = granularity_mask + 1 - (ptr & granularity_mask);
FILE_munmap( (void *)ptr, 0, extra );
ptr += extra;
view_size -= extra;
}
if (view_size > size)
FILE_munmap( (void *)(ptr + size), 0, view_size - size );
}
else if (ptr != base)
{
/* We couldn't get the address we wanted */
FILE_munmap( (void *)ptr, 0, view_size );
SetLastError( ERROR_INVALID_ADDRESS );
return NULL;
}
if (!(view = VIRTUAL_CreateView( ptr, size, 0, 0, vprot, -1 )))
{
FILE_munmap( (void *)ptr, 0, size );
SetLastError( ERROR_OUTOFMEMORY );
return NULL;
}
VIRTUAL_DEBUG_DUMP_VIEW( view );
return (LPVOID)ptr;
}
/* Commit the pages */
if (!(view = VIRTUAL_FindView( base )) ||
(base + size > view->base + view->size))
{
SetLastError( ERROR_INVALID_PARAMETER );
return NULL;
}
if (!VIRTUAL_SetProt( view, base, size, vprot )) return NULL;
return (LPVOID)base;
}
/***********************************************************************
* VirtualFree (KERNEL32.550)
* Release or decommits a region of pages in virtual address space.
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI VirtualFree(
LPVOID addr, /* [in] Address of region of committed pages */
DWORD size, /* [in] Size of region */
DWORD type /* [in] Type of operation */
) {
FILE_VIEW *view;
UINT base;
TRACE(virtual, "%08x %08lx %lx\n",
(UINT)addr, size, type );
/* Fix the parameters */
size = ROUND_SIZE( addr, size );
base = ROUND_ADDR( addr );
if (!(view = VIRTUAL_FindView( base )) ||
(base + size > view->base + view->size))
{
SetLastError( ERROR_INVALID_PARAMETER );
return FALSE;
}
/* Compute the protection flags */
if ((type != MEM_DECOMMIT) && (type != MEM_RELEASE))
{
SetLastError( ERROR_INVALID_PARAMETER );
return FALSE;
}
/* Free the pages */
if (type == MEM_RELEASE)
{
if (size || (base != view->base))
{
SetLastError( ERROR_INVALID_PARAMETER );
return FALSE;
}
VIRTUAL_DeleteView( view );
return TRUE;
}
/* Decommit the pages */
return VIRTUAL_SetProt( view, base, size, 0 );
}
/***********************************************************************
* VirtualLock (KERNEL32.551)
* Locks the specified region of virtual address space
*
* NOTE
* Always returns TRUE
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI VirtualLock(
LPVOID addr, /* [in] Address of first byte of range to lock */
DWORD size /* [in] Number of bytes in range to lock */
) {
return TRUE;
}
/***********************************************************************
* VirtualUnlock (KERNEL32.556)
* Unlocks a range of pages in the virtual address space
*
* NOTE
* Always returns TRUE
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI VirtualUnlock(
LPVOID addr, /* [in] Address of first byte of range */
DWORD size /* [in] Number of bytes in range */
) {
return TRUE;
}
/***********************************************************************
* VirtualProtect (KERNEL32.552)
* Changes the access protection on a region of committed pages
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI VirtualProtect(
LPVOID addr, /* [in] Address of region of committed pages */
DWORD size, /* [in] Size of region */
DWORD new_prot, /* [in] Desired access protection */
LPDWORD old_prot /* [out] Address of variable to get old protection */
) {
FILE_VIEW *view;
UINT base, i;
BYTE vprot, *p;
TRACE(virtual, "%08x %08lx %08lx\n",
(UINT)addr, size, new_prot );
/* Fix the parameters */
size = ROUND_SIZE( addr, size );
base = ROUND_ADDR( addr );
if (!(view = VIRTUAL_FindView( base )) ||
(base + size > view->base + view->size))
{
SetLastError( ERROR_INVALID_PARAMETER );
return FALSE;
}
/* Make sure all the pages are committed */
p = view->prot + ((base - view->base) >> page_shift);
for (i = size >> page_shift; i; i--, p++)
{
if (!(*p & VPROT_COMMITTED))
{
SetLastError( ERROR_INVALID_PARAMETER );
return FALSE;
}
}
VIRTUAL_GetWin32Prot( view->prot[0], old_prot, NULL );
vprot = VIRTUAL_GetProt( new_prot ) | VPROT_COMMITTED;
return VIRTUAL_SetProt( view, base, size, vprot );
}
/***********************************************************************
* VirtualProtectEx (KERNEL32.553)
* Changes the access protection on a region of committed pages in the
* virtual address space of a specified process
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI VirtualProtectEx(
HANDLE handle, /* [in] Handle of process */
LPVOID addr, /* [in] Address of region of committed pages */
DWORD size, /* [in] Size of region */
DWORD new_prot, /* [in] Desired access protection */
LPDWORD old_prot /* [out] Address of variable to get old protection */ )
{
if (PROCESS_IsCurrent( handle ))
return VirtualProtect( addr, size, new_prot, old_prot );
ERR(virtual,"Unsupported on other process\n");
return FALSE;
}
/***********************************************************************
* VirtualQuery (KERNEL32.554)
* Provides info about a range of pages in virtual address space
*
* RETURNS
* Number of bytes returned in information buffer
*/
DWORD WINAPI VirtualQuery(
LPCVOID addr, /* [in] Address of region */
LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
DWORD len /* [in] Size of buffer */
) {
FILE_VIEW *view = VIRTUAL_FirstView;
UINT base = ROUND_ADDR( addr );
UINT alloc_base = 0;
UINT size = 0;
/* Find the view containing the address */
for (;;)
{
if (!view)
{
size = 0xffff0000 - alloc_base;
break;
}
if (view->base > base)
{
size = view->base - alloc_base;
view = NULL;
break;
}
if (view->base + view->size > base)
{
alloc_base = view->base;
size = view->size;
break;
}
alloc_base = view->base + view->size;
view = view->next;
}
/* Fill the info structure */
if (!view)
{
info->State = MEM_FREE;
info->Protect = 0;
info->AllocationProtect = 0;
info->Type = 0;
}
else
{
BYTE vprot = view->prot[(base - alloc_base) >> page_shift];
VIRTUAL_GetWin32Prot( vprot, &info->Protect, &info->State );
for (size = base - alloc_base; size < view->size; size += page_mask+1)
if (view->prot[size >> page_shift] != vprot) break;
info->AllocationProtect = view->protect;
info->Type = MEM_PRIVATE; /* FIXME */
}
info->BaseAddress = (LPVOID)base;
info->AllocationBase = (LPVOID)alloc_base;
info->RegionSize = size - (base - alloc_base);
return sizeof(*info);
}
/***********************************************************************
* VirtualQueryEx (KERNEL32.555)
* Provides info about a range of pages in virtual address space of a
* specified process
*
* RETURNS
* Number of bytes returned in information buffer
*/
DWORD WINAPI VirtualQueryEx(
HANDLE handle, /* [in] Handle of process */
LPCVOID addr, /* [in] Address of region */
LPMEMORY_BASIC_INFORMATION info, /* [out] Address of info buffer */
DWORD len /* [in] Size of buffer */ )
{
if (PROCESS_IsCurrent( handle ))
return VirtualQuery( addr, info, len );
ERR(virtual,"Unsupported on other process\n");
return 0;
}
/***********************************************************************
* IsBadReadPtr32 (KERNEL32.354)
*
* RETURNS
* FALSE: Process has read access to entire block
* TRUE: Otherwise
*/
BOOL WINAPI IsBadReadPtr(
LPCVOID ptr, /* Address of memory block */
UINT size /* Size of block */
) {
return !VIRTUAL_CheckFlags( (UINT)ptr, size,
VPROT_READ | VPROT_COMMITTED );
}
/***********************************************************************
* IsBadWritePtr32 (KERNEL32.357)
*
* RETURNS
* FALSE: Process has write access to entire block
* TRUE: Otherwise
*/
BOOL WINAPI IsBadWritePtr(
LPVOID ptr, /* [in] Address of memory block */
UINT size /* [in] Size of block in bytes */
) {
return !VIRTUAL_CheckFlags( (UINT)ptr, size,
VPROT_WRITE | VPROT_COMMITTED );
}
/***********************************************************************
* IsBadHugeReadPtr32 (KERNEL32.352)
* RETURNS
* FALSE: Process has read access to entire block
* TRUE: Otherwise
*/
BOOL WINAPI IsBadHugeReadPtr(
LPCVOID ptr, /* [in] Address of memory block */
UINT size /* [in] Size of block */
) {
return IsBadReadPtr( ptr, size );
}
/***********************************************************************
* IsBadHugeWritePtr32 (KERNEL32.353)
* RETURNS
* FALSE: Process has write access to entire block
* TRUE: Otherwise
*/
BOOL WINAPI IsBadHugeWritePtr(
LPVOID ptr, /* [in] Address of memory block */
UINT size /* [in] Size of block */
) {
return IsBadWritePtr( ptr, size );
}
/***********************************************************************
* IsBadCodePtr32 (KERNEL32.351)
*
* RETURNS
* FALSE: Process has read access to specified memory
* TRUE: Otherwise
*/
BOOL WINAPI IsBadCodePtr(
FARPROC ptr /* [in] Address of function */
) {
return !VIRTUAL_CheckFlags( (UINT)ptr, 1, VPROT_EXEC | VPROT_COMMITTED );
}
/***********************************************************************
* IsBadStringPtr32A (KERNEL32.355)
*
* RETURNS
* FALSE: Read access to all bytes in string
* TRUE: Else
*/
BOOL WINAPI IsBadStringPtrA(
LPCSTR str, /* [in] Address of string */
UINT max /* [in] Maximum size of string */
) {
FILE_VIEW *view;
UINT page, count;
if (!max) return FALSE;
if (!(view = VIRTUAL_FindView( (UINT)str ))) return TRUE;
page = ((UINT)str - view->base) >> page_shift;
count = page_mask + 1 - ((UINT)str & page_mask);
while (max)
{
if ((view->prot[page] & (VPROT_READ | VPROT_COMMITTED)) !=
(VPROT_READ | VPROT_COMMITTED))
return TRUE;
if (count > max) count = max;
max -= count;
while (count--) if (!*str++) return FALSE;
if (++page >= view->size >> page_shift) return TRUE;
count = page_mask + 1;
}
return FALSE;
}
/***********************************************************************
* IsBadStringPtr32W (KERNEL32.356)
* See IsBadStringPtr32A
*/
BOOL WINAPI IsBadStringPtrW( LPCWSTR str, UINT max )
{
FILE_VIEW *view;
UINT page, count;
if (!max) return FALSE;
if (!(view = VIRTUAL_FindView( (UINT)str ))) return TRUE;
page = ((UINT)str - view->base) >> page_shift;
count = (page_mask + 1 - ((UINT)str & page_mask)) / sizeof(WCHAR);
while (max)
{
if ((view->prot[page] & (VPROT_READ | VPROT_COMMITTED)) !=
(VPROT_READ | VPROT_COMMITTED))
return TRUE;
if (count > max) count = max;
max -= count;
while (count--) if (!*str++) return FALSE;
if (++page >= view->size >> page_shift) return TRUE;
count = (page_mask + 1) / sizeof(WCHAR);
}
return FALSE;
}
/***********************************************************************
* CreateFileMapping32A (KERNEL32.46)
* Creates a named or unnamed file-mapping object for the specified file
*
* RETURNS
* Handle: Success
* 0: Mapping object does not exist
* NULL: Failure
*/
HANDLE WINAPI CreateFileMappingA(
HFILE hFile, /* [in] Handle of file to map */
SECURITY_ATTRIBUTES *sa, /* [in] Optional security attributes*/
DWORD protect, /* [in] Protection for mapping object */
DWORD size_high, /* [in] High-order 32 bits of object size */
DWORD size_low, /* [in] Low-order 32 bits of object size */
LPCSTR name /* [in] Name of file-mapping object */ )
{
struct create_mapping_request req;
struct create_mapping_reply reply;
BYTE vprot;
/* Check parameters */
TRACE(virtual,"(%x,%p,%08lx,%08lx%08lx,%s)\n",
hFile, sa, protect, size_high, size_low, debugstr_a(name) );
vprot = VIRTUAL_GetProt( protect );
if (protect & SEC_RESERVE)
{
if (hFile != INVALID_HANDLE_VALUE)
{
SetLastError( ERROR_INVALID_PARAMETER );
return 0;
}
}
else vprot |= VPROT_COMMITTED;
if (protect & SEC_NOCACHE) vprot |= VPROT_NOCACHE;
/* Create the server object */
req.handle = hFile;
req.size_high = size_high;
req.size_low = size_low;
req.protect = vprot;
req.inherit = (sa && (sa->nLength>=sizeof(*sa)) && sa->bInheritHandle);
CLIENT_SendRequest( REQ_CREATE_MAPPING, -1, 2,
&req, sizeof(req),
name, name ? strlen(name) + 1 : 0 );
SetLastError(0);
CLIENT_WaitSimpleReply( &reply, sizeof(reply), NULL );
if (reply.handle == -1) return 0;
return reply.handle;
}
/***********************************************************************
* CreateFileMapping32W (KERNEL32.47)
* See CreateFileMapping32A
*/
HANDLE WINAPI CreateFileMappingW( HFILE hFile, LPSECURITY_ATTRIBUTES attr,
DWORD protect, DWORD size_high,
DWORD size_low, LPCWSTR name )
{
LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
HANDLE ret = CreateFileMappingA( hFile, attr, protect,
size_high, size_low, nameA );
HeapFree( GetProcessHeap(), 0, nameA );
return ret;
}
/***********************************************************************
* OpenFileMapping32A (KERNEL32.397)
* Opens a named file-mapping object.
*
* RETURNS
* Handle: Success
* NULL: Failure
*/
HANDLE WINAPI OpenFileMappingA(
DWORD access, /* [in] Access mode */
BOOL inherit, /* [in] Inherit flag */
LPCSTR name ) /* [in] Name of file-mapping object */
{
struct open_named_obj_request req;
struct open_named_obj_reply reply;
int len = name ? strlen(name) + 1 : 0;
req.type = OPEN_MAPPING;
req.access = access;
req.inherit = inherit;
CLIENT_SendRequest( REQ_OPEN_NAMED_OBJ, -1, 2, &req, sizeof(req), name, len );
CLIENT_WaitSimpleReply( &reply, sizeof(reply), NULL );
if (reply.handle == -1) return 0; /* must return 0 on failure, not -1 */
return reply.handle;
}
/***********************************************************************
* OpenFileMapping32W (KERNEL32.398)
* See OpenFileMapping32A
*/
HANDLE WINAPI OpenFileMappingW( DWORD access, BOOL inherit, LPCWSTR name)
{
LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
HANDLE ret = OpenFileMappingA( access, inherit, nameA );
HeapFree( GetProcessHeap(), 0, nameA );
return ret;
}
/***********************************************************************
* MapViewOfFile (KERNEL32.385)
* Maps a view of a file into the address space
*
* RETURNS
* Starting address of mapped view
* NULL: Failure
*/
LPVOID WINAPI MapViewOfFile(
HANDLE mapping, /* [in] File-mapping object to map */
DWORD access, /* [in] Access mode */
DWORD offset_high, /* [in] High-order 32 bits of file offset */
DWORD offset_low, /* [in] Low-order 32 bits of file offset */
DWORD count /* [in] Number of bytes to map */
) {
return MapViewOfFileEx( mapping, access, offset_high,
offset_low, count, NULL );
}
/***********************************************************************
* MapViewOfFileEx (KERNEL32.386)
* Maps a view of a file into the address space
*
* RETURNS
* Starting address of mapped view
* NULL: Failure
*/
LPVOID WINAPI MapViewOfFileEx(
HANDLE handle, /* [in] File-mapping object to map */
DWORD access, /* [in] Access mode */
DWORD offset_high, /* [in] High-order 32 bits of file offset */
DWORD offset_low, /* [in] Low-order 32 bits of file offset */
DWORD count, /* [in] Number of bytes to map */
LPVOID addr /* [in] Suggested starting address for mapped view */
) {
FILE_VIEW *view;
UINT ptr = (UINT)-1, size = 0;
int flags = MAP_PRIVATE;
int unix_handle = -1;
struct get_mapping_info_request req;
struct get_mapping_info_reply info;
/* Check parameters */
if ((offset_low & granularity_mask) ||
(addr && ((UINT)addr & granularity_mask)))
{
SetLastError( ERROR_INVALID_PARAMETER );
return NULL;
}
req.handle = handle;
CLIENT_SendRequest( REQ_GET_MAPPING_INFO, -1, 1, &req, sizeof(req) );
if (CLIENT_WaitSimpleReply( &info, sizeof(info), &unix_handle ))
goto error;
if (info.size_high || offset_high)
ERR(virtual, "Offsets larger than 4Gb not supported\n");
if ((offset_low >= info.size_low) ||
(count > info.size_low - offset_low))
{
SetLastError( ERROR_INVALID_PARAMETER );
goto error;
}
if (count) size = ROUND_SIZE( offset_low, count );
else size = info.size_low - offset_low;
switch(access)
{
case FILE_MAP_ALL_ACCESS:
case FILE_MAP_WRITE:
case FILE_MAP_WRITE | FILE_MAP_READ:
if (!(info.protect & VPROT_WRITE))
{
SetLastError( ERROR_INVALID_PARAMETER );
goto error;
}
flags = MAP_SHARED;
/* fall through */
case FILE_MAP_READ:
case FILE_MAP_COPY:
case FILE_MAP_COPY | FILE_MAP_READ:
if (info.protect & VPROT_READ) break;
/* fall through */
default:
SetLastError( ERROR_INVALID_PARAMETER );
goto error;
}
/* Map the file */
TRACE(virtual, "handle=%x size=%x offset=%lx\n",
handle, size, offset_low );
ptr = (UINT)FILE_dommap( unix_handle,
addr, 0, size, 0, offset_low,
VIRTUAL_GetUnixProt( info.protect ),
flags );
if (ptr == (UINT)-1) {
/* KB: Q125713, 25-SEP-1995, "Common File Mapping Problems and
* Platform Differences":
* Windows NT: ERROR_INVALID_PARAMETER
* Windows 95: ERROR_INVALID_ADDRESS.
* FIXME: So should we add a module dependend check here? -MM
*/
if (errno==ENOMEM)
SetLastError( ERROR_OUTOFMEMORY );
else
SetLastError( ERROR_INVALID_PARAMETER );
goto error;
}
if (!(view = VIRTUAL_CreateView( ptr, size, offset_low, 0,
info.protect, handle )))
{
SetLastError( ERROR_OUTOFMEMORY );
goto error;
}
if (unix_handle != -1) close( unix_handle );
return (LPVOID)ptr;
error:
if (unix_handle != -1) close( unix_handle );
if (ptr != (UINT)-1) FILE_munmap( (void *)ptr, 0, size );
return NULL;
}
/***********************************************************************
* FlushViewOfFile (KERNEL32.262)
* Writes to the disk a byte range within a mapped view of a file
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI FlushViewOfFile(
LPCVOID base, /* [in] Start address of byte range to flush */
DWORD cbFlush /* [in] Number of bytes in range */
) {
FILE_VIEW *view;
UINT addr = ROUND_ADDR( base );
TRACE(virtual, "FlushViewOfFile at %p for %ld bytes\n",
base, cbFlush );
if (!(view = VIRTUAL_FindView( addr )))
{
SetLastError( ERROR_INVALID_PARAMETER );
return FALSE;
}
if (!cbFlush) cbFlush = view->size;
if (!msync( (void *)addr, cbFlush, MS_SYNC )) return TRUE;
SetLastError( ERROR_INVALID_PARAMETER );
return FALSE;
}
/***********************************************************************
* UnmapViewOfFile (KERNEL32.540)
* Unmaps a mapped view of a file.
*
* NOTES
* Should addr be an LPCVOID?
*
* RETURNS
* TRUE: Success
* FALSE: Failure
*/
BOOL WINAPI UnmapViewOfFile(
LPVOID addr /* [in] Address where mapped view begins */
) {
FILE_VIEW *view;
UINT base = ROUND_ADDR( addr );
if (!(view = VIRTUAL_FindView( base )) || (base != view->base))
{
SetLastError( ERROR_INVALID_PARAMETER );
return FALSE;
}
VIRTUAL_DeleteView( view );
return TRUE;
}
/***********************************************************************
* VIRTUAL_MapFileW
*
* Helper function to map a file to memory:
* name - file name
* [RETURN] ptr - pointer to mapped file
*/
LPVOID VIRTUAL_MapFileW( LPCWSTR name )
{
HANDLE hFile, hMapping;
LPVOID ptr = NULL;
hFile = CreateFileW( name, GENERIC_READ, FILE_SHARE_READ, NULL,
OPEN_EXISTING, FILE_FLAG_RANDOM_ACCESS, 0);
if (hFile != INVALID_HANDLE_VALUE)
{
hMapping = CreateFileMappingA( hFile, NULL, PAGE_READONLY, 0, 0, NULL );
CloseHandle( hFile );
if (hMapping)
{
ptr = MapViewOfFile( hMapping, FILE_MAP_READ, 0, 0, 0 );
CloseHandle( hMapping );
}
}
return ptr;
}
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