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source: trunk/src/kernel32/virtual.cpp@ 8877

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Last change on this file since 8877 was 8877, checked in by sandervl, 23 years ago
Rewrote algorithm for 64kb alignment in VirtualAlloc'ed memory; allocation changes for heap (in 64kb chunks) & PE image (align at 64kb)
File size: 28.1 KB

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1	/* $Id: virtual.cpp,v 1.48 2002-07-15 14:28:52 sandervl Exp $ */
2
3	/*
4	* Win32 virtual memory functions
5	*
6	* Copyright 1998-1999 Sander van Leeuwen (sandervl@xs4all.nl)
7	* Copyright 1998 Knut St. Osmundsen
8	* Copyright 1998 Peter FitzSimmons
9	*
10	* Parts (VIRTUAL_MapFileA/W) based on Wine code (memory\virtual.c):
11	*
12	* Copyright 1997 Alexandre Julliard
13	*
14	* Project Odin Software License can be found in LICENSE.TXT
15	*
16	*/
17
18	#include <odin.h>
19	#include <odinwrap.h>
20
21	#include <os2win.h>
22	#include <stdlib.h>
23	#include <string.h>
24	#include <win\virtual.h>
25	#include <win\thread.h>
26	#include <heapstring.h>
27	#include <handlemanager.h>
28	#include "mmap.h"
29	#include "oslibdos.h"
30	#include "oslibmem.h"
31
32	#define DBG_LOCALLOG DBG_virtual
33	#include "dbglocal.h"
34
35	ODINDEBUGCHANNEL(KERNEL32-VIRTUAL)
36
37	#define PAGE_SHIFT 12
38
39	/***********************************************************************
40	* CreateFileMapping32A (KERNEL32.46)
41	* Creates a named or unnamed file-mapping object for the specified file
42	*
43	* RETURNS
44	* Handle: Success
45	* 0: Mapping object does not exist
46	* NULL: Failure
47	*/
48	HANDLE WINAPI CreateFileMappingA(
49	HFILE hFile, /* [in] Handle of file to map */
50	SECURITY_ATTRIBUTES sa, / [in] Optional security attributes*/
51	DWORD protect, /* [in] Protection for mapping object */
52	DWORD size_high, /* [in] High-order 32 bits of object size */
53	DWORD size_low, /* [in] Low-order 32 bits of object size */
54	LPCSTR name /* [in] Name of file-mapping object */ )
55	{
56	HANDLE hFileMap;
57
58	dprintf(("CreateFileMappingA: %x %x %x%x %s", hFile, protect, size_high, size_low, name));
59	hFileMap = HMCreateFileMapping(hFile, sa, protect, size_high, size_low, name);
60	dprintf(("CreateFileMappingA returned %x", hFileMap));
61	return hFileMap;
62	}
63
64
65	/***********************************************************************
66	* CreateFileMapping32W (KERNEL32.47)
67	* See CreateFileMapping32A
68	*/
69	HANDLE WINAPI CreateFileMappingW( HFILE hFile, LPSECURITY_ATTRIBUTES attr,
70	DWORD protect, DWORD size_high,
71	DWORD size_low, LPCWSTR name )
72	{
73	LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
74	HANDLE ret = CreateFileMappingA( hFile, attr, protect,
75	size_high, size_low, nameA );
76	HeapFree( GetProcessHeap(), 0, nameA );
77	return ret;
78	}
79
80
81	/***********************************************************************
82	* OpenFileMapping32A (KERNEL32.397)
83	* Opens a named file-mapping object.
84	*
85	* RETURNS
86	* Handle: Success
87	* NULL: Failure
88	*/
89	HANDLE WINAPI OpenFileMappingA(
90	DWORD access, /* [in] Access mode */
91	BOOL inherit, /* [in] Inherit flag */
92	LPCSTR name ) /* [in] Name of file-mapping object */
93	{
94	dprintf(("OpenFileMappingA: %x %d %s", access, inherit, name));
95	return HMOpenFileMapping(access, inherit, name);
96	}
97
98
99	/***********************************************************************
100	* OpenFileMapping32W (KERNEL32.398)
101	* See OpenFileMapping32A
102	*/
103	HANDLE WINAPI OpenFileMappingW( DWORD access, BOOL inherit, LPCWSTR name)
104	{
105	LPSTR nameA = HEAP_strdupWtoA( GetProcessHeap(), 0, name );
106	HANDLE ret = OpenFileMappingA( access, inherit, nameA );
107	HeapFree( GetProcessHeap(), 0, nameA );
108	return ret;
109	}
110
111
112	/***********************************************************************
113	* MapViewOfFile (KERNEL32.385)
114	* Maps a view of a file into the address space
115	*
116	* RETURNS
117	* Starting address of mapped view
118	* NULL: Failure
119	*/
120	LPVOID WINAPI MapViewOfFile(
121	HANDLE mapping, /* [in] File-mapping object to map */
122	DWORD access, /* [in] Access mode */
123	DWORD offset_high, /* [in] High-order 32 bits of file offset */
124	DWORD offset_low, /* [in] Low-order 32 bits of file offset */
125	DWORD count /* [in] Number of bytes to map */
126	)
127	{
128	return MapViewOfFileEx( mapping, access, offset_high,
129	offset_low, count, NULL );
130	}
131
132
133	/***********************************************************************
134	* MapViewOfFileEx (KERNEL32.386)
135	* Maps a view of a file into the address space
136	*
137	* RETURNS
138	* Starting address of mapped view
139	* NULL: Failure
140	*/
141	LPVOID WINAPI MapViewOfFileEx(
142	HANDLE handle, /* [in] File-mapping object to map */
143	DWORD access, /* [in] Access mode */
144	DWORD offset_high, /* [in] High-order 32 bits of file offset */
145	DWORD offset_low, /* [in] Low-order 32 bits of file offset */
146	DWORD count, /* [in] Number of bytes to map */
147	LPVOID addr /* [in] Suggested starting address for mapped view */
148	)
149	{
150	return HMMapViewOfFileEx(handle, access, offset_high, offset_low, count, addr);
151	}
152
153
154	/***********************************************************************
155	* FlushViewOfFile (KERNEL32.262)
156	* Writes to the disk a byte range within a mapped view of a file
157	*
158	* RETURNS
159	* TRUE: Success
160	* FALSE: Failure
161	*/
162	BOOL WINAPI FlushViewOfFile(
163	LPCVOID base, /* [in] Start address of byte range to flush */
164	DWORD cbFlush /* [in] Number of bytes in range */
165	)
166	{
167	Win32MemMap *map;
168	DWORD offset;
169
170	if (!base)
171	{
172	SetLastError( ERROR_INVALID_PARAMETER );
173	return FALSE;
174	}
175	map = Win32MemMapView::findMapByView((ULONG)base, &offset, MEMMAP_ACCESS_READ);
176	if(map == NULL) {
177	SetLastError( ERROR_FILE_NOT_FOUND );
178	return FALSE;
179	}
180	return map->flushView(offset, cbFlush);
181	}
182
183
184	/***********************************************************************
185	* UnmapViewOfFile (KERNEL32.540)
186	* Unmaps a mapped view of a file.
187	*
188	* NOTES
189	* Should addr be an LPCVOID?
190	*
191	* RETURNS
192	* TRUE: Success
193	* FALSE: Failure
194	*/
195	BOOL WINAPI UnmapViewOfFile(LPVOID addr /* [in] Address where mapped view begins */
196	)
197	{
198	Win32MemMap *map;
199	Win32MemMapView *view;
200
201	DWORD offset;
202
203	if (!addr)
204	{
205	SetLastError( ERROR_INVALID_PARAMETER );
206	return FALSE;
207	}
208	map = Win32MemMapView::findMapByView((ULONG)addr, &offset, MEMMAP_ACCESS_READ, &view);
209	if(map == NULL) {
210	SetLastError( ERROR_FILE_NOT_FOUND );
211	return FALSE;
212	}
213	return map->unmapViewOfFile(view);
214	}
215
216	/***********************************************************************
217	* VIRTUAL_MapFileW
218	*
219	* Helper function to map a file to memory:
220	* name - file name
221	* [RETURN] ptr - pointer to mapped file
222	*/
223	HANDLE WINAPI VIRTUAL_MapFileW( LPCWSTR name , LPVOID *lpMapping, BOOL fReadIntoMemory)
224	{
225	HANDLE hFile, hMapping = -1;
226
227	hFile = CreateFileW( name, GENERIC_READ, FILE_SHARE_READ\|FILE_SHARE_WRITE, NULL,
228	OPEN_EXISTING, FILE_FLAG_RANDOM_ACCESS, 0);
229	if (hFile != INVALID_HANDLE_VALUE)
230	{
231	hMapping = CreateFileMappingA( hFile, NULL, PAGE_READONLY \| ((fReadIntoMemory) ? SEC_COMMIT : 0), 0, 0, NULL );
232	CloseHandle( hFile );
233	if (hMapping)
234	{
235	*lpMapping = MapViewOfFile( hMapping, FILE_MAP_READ, 0, 0, 0 );
236	}
237	}
238	return hMapping;
239	}
240
241	/***********************************************************************
242	* VIRTUAL_MapFileA
243	*
244	* Helper function to map a file to memory:
245	* name - file name
246	* [RETURN] ptr - pointer to mapped file
247	*/
248	HANDLE WINAPI VIRTUAL_MapFileA( LPCSTR name , LPVOID *lpMapping, BOOL fReadIntoMemory)
249	{
250	HANDLE hFile, hMapping = -1;
251
252	hFile = CreateFileA(name, GENERIC_READ, FILE_SHARE_READ\|FILE_SHARE_WRITE, NULL,
253	OPEN_EXISTING, FILE_FLAG_RANDOM_ACCESS, 0);
254	if (hFile != INVALID_HANDLE_VALUE)
255	{
256	hMapping = CreateFileMappingA( hFile, NULL, PAGE_READONLY \| ((fReadIntoMemory) ? SEC_COMMIT : 0), 0, 0, NULL );
257	CloseHandle( hFile );
258	if (hMapping)
259	{
260	*lpMapping = MapViewOfFile( hMapping, FILE_MAP_READ, 0, 0, 0 );
261	}
262	}
263	return hMapping;
264	}
265
266	//******************************************************************************
267	//******************************************************************************
268	LPVOID WIN32API VirtualAlloc(LPVOID lpvAddress,
269	DWORD cbSize,
270	DWORD fdwAllocationType,
271	DWORD fdwProtect)
272	{
273	PVOID Address = lpvAddress;
274	ULONG flag = 0, base;
275	DWORD rc;
276
277	SetLastError(ERROR_SUCCESS);
278
279	if (cbSize > 0x7fc00000) /* 2Gb - 4Mb */
280	{
281	dprintf(("VirtualAlloc: size too large"));
282	SetLastError( ERROR_OUTOFMEMORY );
283	return NULL;
284	}
285
286	if (!(fdwAllocationType & (MEM_COMMIT \| MEM_RESERVE)) \|\|
287	(fdwAllocationType & ~(MEM_COMMIT \| MEM_RESERVE)))
288	{
289	dprintf(("VirtualAlloc: Invalid parameter"));
290	SetLastError( ERROR_INVALID_PARAMETER );
291	return NULL;
292	}
293
294	if(fdwAllocationType & MEM_COMMIT)
295	{
296	dprintf(("VirtualAlloc: commit\n"));
297	flag = PAG_COMMIT;
298	}
299
300	if(fdwAllocationType & MEM_RESERVE) {
301	//SvL: DosRead crashes if memory is initially reserved with write
302	// access disabled (OS/2 bug) even if the commit sets the page
303	// flags to read/write:
304	// DosSetMem does not alter the 16 bit selectors so if you change memory
305	// attributes and then access the memory with a 16 bit API (such as DosRead),
306	// it will have the old (alloc time) attributes
307	flag \|= PAG_READ\|PAG_WRITE;
308	}
309	if(fdwProtect & PAGE_READONLY) flag \|= PAG_READ;
310	if(fdwProtect & PAGE_NOACCESS) flag \|= PAG_READ; //can't do this in OS/2
311	if(fdwProtect & PAGE_READWRITE) flag \|= (PAG_READ \| PAG_WRITE);
312	if(fdwProtect & PAGE_WRITECOPY) flag \|= (PAG_READ \| PAG_WRITE);
313
314	if(fdwProtect & PAGE_EXECUTE_READWRITE) flag \|= (PAG_EXECUTE \| PAG_WRITE \| PAG_READ);
315	if(fdwProtect & PAGE_EXECUTE_READ) flag \|= (PAG_EXECUTE \| PAG_READ);
316	if(fdwProtect & PAGE_EXECUTE) flag \|= PAG_EXECUTE;
317
318	if(fdwProtect & PAGE_GUARD) {
319	dprintf(("ERROR: PAGE_GUARD bit set for VirtualAlloc -> we don't support this right now!"));
320	flag \|= PAG_GUARD;
321	}
322
323	//just do this if other options are used
324	if(!(flag & (PAG_READ \| PAG_WRITE \| PAG_EXECUTE)) \|\| flag == 0)
325	{
326	dprintf(("VirtualAlloc: Unknown protection flags, default to read/write"));
327	flag \|= PAG_READ \| PAG_WRITE;
328	}
329
330	if(lpvAddress)
331	{
332	Win32MemMap *map;
333	ULONG offset, nrpages, accessflags = 0;
334
335	nrpages = cbSize >> PAGE_SHIFT;
336	if(cbSize & 0xFFF)
337	nrpages++;
338
339	if(flag & PAG_READ) {
340	accessflags \|= MEMMAP_ACCESS_READ;
341	}
342	if(flag & PAG_WRITE) {
343	accessflags \|= MEMMAP_ACCESS_WRITE;
344	}
345	if(flag & PAG_EXECUTE) {
346	accessflags \|= MEMMAP_ACCESS_EXECUTE;
347	}
348	map = Win32MemMapView::findMapByView((ULONG)lpvAddress, &offset, accessflags);
349	if(map) {
350	//TODO: We don't allow protection flag changes for mmaped files now
351	map->commitPage(offset, FALSE, nrpages);
352	return lpvAddress;
353	}
354	}
355
356	// commit memory
357	if(fdwAllocationType & MEM_COMMIT)
358	{
359	Address = lpvAddress;
360
361	rc = OSLibDosSetMem(lpvAddress, cbSize, flag);
362
363	//might try to commit larger part with same base address
364	if(rc == OSLIB_ERROR_ACCESS_DENIED && cbSize > 4096 )
365	{ //knut: AND more than one page
366	char newbase = (char )lpvAddress + ((cbSize-1) & 0xFFFFF000); //knut: lets not start after the last page!
367	ULONG size, os2flags;
368
369	while(newbase >= (char *)lpvAddress)
370	{ //knut: should check first page to!!
371	size = 4096;
372	os2flags = 0;
373	rc = OSLibDosQueryMem(newbase, &size, &os2flags);
374	if(rc)
375	break;
376
377	if(os2flags & PAG_COMMIT)
378	{
379	newbase += 4096;
380	break;
381	}
382	newbase -= 4096;
383	}
384
385	if(rc == 0)
386	{
387	//In case it wants to commit bytes that fall into the last
388	//page of the previous commit command
389	if(cbSize > ((int)newbase - (int)lpvAddress))
390	rc = OSLibDosSetMem(newbase, cbSize - ((int)newbase - (int)lpvAddress), flag);
391	}
392	else return(NULL);
393	}
394	else
395	{
396	if(rc == OSLIB_ERROR_INVALID_ADDRESS) {
397	rc = OSLibDosAllocMem(&Address, cbSize, flag );
398	}
399	else {
400	if(rc) {
401	//check if the app tries to commit an already commited part of memory or change the protection flags
402	ULONG size = cbSize, os2flags, newrc;
403	newrc = OSLibDosQueryMem(lpvAddress, &size, &os2flags);
404	if(newrc == 0) {
405	if(size >= cbSize && (os2flags & PAG_COMMIT)) {
406	dprintf(("VirtualAlloc: commit on committed memory"));
407	if((flag & (PAG_READ\|PAG_WRITE\|PAG_EXECUTE)) != (os2flags & (PAG_READ\|PAG_WRITE\|PAG_EXECUTE)))
408	{ //change protection flags
409	DWORD tmp;
410	if(VirtualProtect(lpvAddress, cbSize, fdwProtect, &tmp) == TRUE) {
411	return lpvAddress;
412	}
413	dprintf(("ERROR: VirtualAlloc: commit on committed memory -> VirtualProtect failed!!"));
414	return NULL;
415	}
416	//else everything ok
417	return lpvAddress;
418	}
419	else dprintf(("Unexpected DosSetMem error %x", rc));
420	}
421	else {
422	dprintf(("Unexpected DosQueryMem error %x", newrc));
423	}
424	}
425	}
426	}
427	}
428	else
429	{
430	rc = OSLibDosAllocMem(&Address, cbSize, flag);
431	}
432
433	if(rc)
434	{
435	dprintf(("DosSetMem returned %d\n", rc));
436	SetLastError( ERROR_OUTOFMEMORY );
437	return(NULL);
438	}
439
440	dprintf(("VirtualAlloc returned %X\n", Address));
441	return(Address);
442	}
443	//******************************************************************************
444	//******************************************************************************
445	BOOL WIN32API VirtualFree(LPVOID lpvAddress,
446	DWORD cbSize,
447	DWORD FreeType)
448	{
449	DWORD rc;
450
451	SetLastError(ERROR_SUCCESS);
452
453	// verify parameters
454	if((FreeType & MEM_RELEASE) && (cbSize != 0))
455	{
456	dprintf(("WARNING: VirtualFree: invalid parameter!!"));
457	SetLastError(ERROR_INVALID_PARAMETER);
458	return(FALSE);
459	}
460
461	if((FreeType & MEM_DECOMMIT) && (FreeType & MEM_RELEASE))
462	{
463	dprintf(("WARNING: VirtualFree: invalid parameter!!"));
464	SetLastError(ERROR_INVALID_PARAMETER);
465	return(FALSE);
466	}
467
468	// decommit memory
469	if (FreeType & MEM_DECOMMIT)
470	{
471	// check if app wants to decommit stack pages -> don't allow that!
472	TEB *teb = GetThreadTEB();
473	if(teb) {
474	if(lpvAddress >= teb->stack_low && lpvAddress < teb->stack_top) {
475	//pretend we did was was asked
476	dprintf(("WARNING: app tried to decommit stack pages; pretend success"));
477	return TRUE;
478	}
479	}
480	// decommit memory block
481	rc = OSLibDosSetMem(lpvAddress, cbSize, PAG_DECOMMIT);
482	if(rc)
483	{
484	if(rc == 32803) { //SvL: ERROR_ALIAS
485	dprintf(("KERNEL32:VirtualFree:OsLibSetMem rc = #%d; app tries to decommit aliased memory; ignore", rc));
486	return(TRUE);
487	}
488	dprintf(("KERNEL32:VirtualFree:OsLibSetMem rc = #%d\n", rc));
489	SetLastError(ERROR_INVALID_ADDRESS);
490	return(FALSE);
491	}
492	}
493
494	// release memory
495	if (FreeType & MEM_RELEASE)
496	{
497	rc = OSLibDosFreeMem(lpvAddress); // free the memory block
498	if(rc)
499	{
500	dprintf(("KERNEL32:VirtualFree:OsLibFreeMem rc = #%d\n", rc));
501	SetLastError(ERROR_INVALID_ADDRESS);
502	return(FALSE);
503	}
504	}
505	return TRUE;
506	}
507	//******************************************************************************
508	//LPVOID lpvAddress; /* address of region of committed pages */
509	//DWORD cbSize; /* size of the region */
510	//DWORD fdwNewProtect; /* desired access protection */
511	//PDWORD pfdwOldProtect; /* address of variable to get old protection */
512	//TODO: Not 100% complete
513	//TODO: SetLastError on failure
514	//******************************************************************************
515
516	BOOL WIN32API VirtualProtect(LPVOID lpvAddress,
517	DWORD cbSize,
518	DWORD fdwNewProtect,
519	DWORD* pfdwOldProtect)
520	{
521	DWORD rc;
522	DWORD cb = cbSize;
523	ULONG pageFlags = 0;
524	int npages;
525
526	if(pfdwOldProtect == NULL) {
527	dprintf(("WARNING: pfdwOldProtect == NULL"));
528	SetLastError(ERROR_INVALID_PARAMETER);
529	return(FALSE);
530	}
531
532	SetLastError(ERROR_SUCCESS);
533
534	rc = OSLibDosQueryMem(lpvAddress, &cb, &pageFlags);
535	if(rc) {
536	dprintf(("DosQueryMem returned %d\n", rc));
537	return(FALSE);
538	}
539	dprintf(("Old memory flags %X\n", pageFlags));
540	*pfdwOldProtect = 0;
541	if(pageFlags & PAG_READ && !(pageFlags & PAG_WRITE))
542	*pfdwOldProtect \|= PAGE_READONLY;
543	if(pageFlags & (PAG_WRITE))
544	*pfdwOldProtect \|= PAGE_READWRITE;
545
546	if((pageFlags & (PAG_WRITE \| PAG_EXECUTE)) == (PAG_WRITE \| PAG_EXECUTE))
547	*pfdwOldProtect \|= PAGE_EXECUTE_READWRITE;
548	else
549	if(pageFlags & PAG_EXECUTE)
550	*pfdwOldProtect \|= PAGE_EXECUTE_READ;
551
552	if(pageFlags & PAG_GUARD)
553	*pfdwOldProtect \|= PAGE_GUARD;
554	pageFlags = 0;
555
556	if(fdwNewProtect & PAGE_READONLY) pageFlags \|= PAG_READ;
557	if(fdwNewProtect & PAGE_READWRITE) pageFlags \|= (PAG_READ \| PAG_WRITE);
558	if(fdwNewProtect & PAGE_WRITECOPY) pageFlags \|= (PAG_READ \| PAG_WRITE);
559	if(fdwNewProtect & PAGE_EXECUTE_READ) pageFlags \|= (PAG_EXECUTE \| PAG_READ);
560	if(fdwNewProtect & PAGE_EXECUTE_READWRITE)
561	pageFlags \|= (PAG_EXECUTE \| PAG_WRITE \| PAG_READ);
562	if(fdwNewProtect & PAGE_EXECUTE_WRITECOPY)
563	pageFlags \|= (PAG_EXECUTE \| PAG_WRITE \| PAG_READ);
564	if(fdwNewProtect & PAGE_GUARD) pageFlags \|= PAG_GUARD;
565	//Not supported in OS/2??
566	// if(fdwNewProtect & PAGE_NOACCESS)
567
568	dprintf(("New memory flags %X\n", pageFlags));
569	if(pageFlags == 0) {
570	dprintf(("pageFlags == 0\n"));
571	return(TRUE); //nothing to do
572	}
573	ULONG offset = ((ULONG)lpvAddress & 0xFFF);
574	npages = (cbSize >> 12);
575
576	cb = (cbSize & 0xFFF) + offset; // !!! added, some optimization :)
577	if( cb > 0 ) { // changed
578	npages++;
579	}
580	if( cb > 4096 ) { // changed, note '>' sign ( not '>=' ) 4096 is exactly one page
581	npages++;
582	}
583
584	lpvAddress = (LPVOID)((int)lpvAddress & ~0xFFF);
585	cbSize = npages*4096;
586	dprintf(("lpvAddress = %X, cbSize = %d\n", lpvAddress, cbSize));
587
588	rc = OSLibDosSetMem(lpvAddress, cbSize, pageFlags);
589	if(rc) {
590	dprintf(("DosSetMem returned %d\n", rc));
591	return(FALSE);
592	}
593	return(TRUE);
594	}
595	//******************************************************************************
596	//******************************************************************************
597	DWORD WIN32API VirtualQuery(LPCVOID lpvAddress,
598	LPMEMORY_BASIC_INFORMATION pmbiBuffer,
599	DWORD cbLength)
600	{
601	ULONG cbRangeSize, dAttr;
602	DWORD rc;
603	LPVOID lpBase;
604
605	SetLastError(ERROR_SUCCESS);
606
607	if(pmbiBuffer == NULL \|\| cbLength != sizeof(MEMORY_BASIC_INFORMATION)) // check parameters
608	{
609	dprintf(("WARNING: invalid parameter"));
610	SetLastError(ERROR_INVALID_PARAMETER);
611	return 0; // nothing to return
612	}
613
614	// determine exact page range
615	lpBase = (LPVOID)((ULONG)lpvAddress & 0xFFFFF000);
616	cbRangeSize = -1;
617
618	rc = OSLibDosQueryMem(lpBase, &cbRangeSize, &dAttr);
619	if(rc)
620	{
621	dprintf(("VirtualQuery - OSLibDosQueryMem %x %x returned %d\n",
622	lpBase, cbLength, rc));
623	SetLastError(ERROR_INVALID_PARAMETER);
624	return 0;
625	}
626
627	memset(pmbiBuffer, 0, sizeof(MEMORY_BASIC_INFORMATION));
628
629	pmbiBuffer->BaseAddress = lpBase;
630	//round to next page boundary
631	pmbiBuffer->RegionSize = (cbRangeSize + 0xFFF) & 0xFFFFF000;
632
633	if(dAttr & PAG_READ && !(dAttr & PAG_WRITE))
634	pmbiBuffer->Protect \|= PAGE_READONLY;
635
636	if(dAttr & PAG_WRITE)
637	pmbiBuffer->Protect \|= PAGE_READWRITE;
638
639	if((dAttr & (PAG_WRITE \| PAG_EXECUTE)) == (PAG_WRITE \| PAG_EXECUTE))
640	pmbiBuffer->Protect \|= PAGE_EXECUTE_READWRITE;
641	else
642	if(dAttr & PAG_EXECUTE)
643	pmbiBuffer->Protect \|= PAGE_EXECUTE_READ;
644
645	if(dAttr & PAG_GUARD)
646	pmbiBuffer->Protect \|= PAGE_GUARD;
647
648	if(dAttr & PAG_FREE)
649	pmbiBuffer->State = MEM_FREE;
650	else
651	if(dAttr & PAG_COMMIT)
652	pmbiBuffer->State = MEM_COMMIT;
653	else
654	pmbiBuffer->State = MEM_RESERVE;
655
656	//TODO: MEM_MAPPED & MEM_IMAGE (==SEC_IMAGE)
657	if(!(dAttr & PAG_SHARED))
658	pmbiBuffer->Type = MEM_PRIVATE;
659
660	// Pages can be committed but not necessarily accessible!!
661	if (!(dAttr & (PAG_READ \| PAG_WRITE \| PAG_EXECUTE \| PAG_GUARD)))
662	pmbiBuffer->Protect = PAGE_NOACCESS;
663
664	//TODO: This is not correct: AllocationProtect should contain the protection
665	// flags used in the initial call to VirtualAlloc
666	pmbiBuffer->AllocationProtect = pmbiBuffer->Protect;
667	pmbiBuffer->AllocationBase = OSLibDosFindMemBase(lpBase);
668
669	dprintf(("Memory region alloc base 0x%08x", pmbiBuffer->AllocationBase));
670	dprintf(("Memory region alloc protect flags %x", pmbiBuffer->AllocationProtect));
671	dprintf(("Memory region base 0x%08x", pmbiBuffer->BaseAddress));
672	dprintf(("Memory region protect flags %x", pmbiBuffer->Protect));
673	dprintf(("Memory region region size 0x%08x", pmbiBuffer->RegionSize));
674	dprintf(("Memory region state 0x%08x", pmbiBuffer->State));
675	dprintf(("Memory region type 0x%08x", pmbiBuffer->Type));
676	return sizeof(MEMORY_BASIC_INFORMATION);
677	}
678	//******************************************************************************
679	//******************************************************************************
680	BOOL WIN32API VirtualLock(LPVOID lpAddress, DWORD dwSize)
681	{
682	dprintf(("VirtualLock at %d; %d bytes - stub (TRUE)\n", (int)lpAddress, dwSize));
683	SetLastError(ERROR_SUCCESS);
684	return TRUE;
685	}
686
687	//******************************************************************************
688	BOOL WIN32API VirtualUnlock(LPVOID lpAddress, DWORD dwSize)
689	{
690	dprintf(("VirtualUnlock at %d; %d bytes - stub (TRUE)\n", (int)lpAddress, dwSize));
691	SetLastError(ERROR_SUCCESS);
692	return TRUE;
693	}
694
695	/*****************************************************************************
696	* Name : BOOL VirtualProtectEx
697	* Purpose : The VirtualProtectEx function changes the access protection on
698	* a region of committed pages in the virtual address space of a specified
699	* process. Note that this function differs from VirtualProtect,
700	* which changes the access protection on the calling process only.
701	* Parameters: HANDLE hProcess handle of process
702	* LPVOID lpvAddress address of region of committed pages
703	* DWORD cbSize size of region
704	* DWORD fdwNewProtect desired access protection
705	* PDWORD pfdwOldProtect address of variable to get old protection
706	* Variables :
707	* Result : size of target buffer
708	* Remark :
709	* Status : UNTESTED STUB
710	*
711	* Author : Patrick Haller [Mon, 1998/06/15 08:00]
712	*****************************************************************************/
713
714	BOOL WIN32API VirtualProtectEx(HANDLE hProcess,
715	LPVOID lpvAddress,
716	DWORD cbSize,
717	DWORD fdwNewProtect,
718	LPDWORD pfdwOldProtect)
719	{
720	// only execute API, if this is the current process !
721	if (GetCurrentProcess() == hProcess)
722	return VirtualProtect(lpvAddress, cbSize, fdwNewProtect, pfdwOldProtect);
723	else
724	{
725	SetLastError(ERROR_ACCESS_DENIED); // deny access to other processes
726	return FALSE;
727	}
728	}
729
730
731	/*****************************************************************************
732	* Name : DWORD VirtualQueryEx
733	* Purpose : The VirtualQueryEx function provides information about a range
734	* of pages within the virtual address space of a specified process.
735	* Parameters: HANDLE hProcess handle of process
736	* LPCVOID lpvAddress address of region
737	* LPMEMORY_BASIC_INFORMATION pmbiBuffer address of information buffer
738	* DWORD cbLength size of buffer
739	* Variables :
740	* Result : number of bytes returned in buffer
741	* Remark :
742	* Status : UNTESTED STUB
743	*
744	* Author : Patrick Haller [Mon, 1998/06/15 08:00]
745	*****************************************************************************/
746
747	DWORD WIN32API VirtualQueryEx(HANDLE hProcess,
748	LPCVOID lpvAddress,
749	LPMEMORY_BASIC_INFORMATION pmbiBuffer,
750	DWORD cbLength)
751	{
752	// only execute API, if this is the current process !
753	if (GetCurrentProcess() == hProcess)
754	return VirtualQuery(lpvAddress, pmbiBuffer, cbLength);
755	else
756	{
757	SetLastError(ERROR_ACCESS_DENIED); // deny access to other processes
758	return FALSE;
759	}
760	}
761
762	//******************************************************************************
763	//SvL: Private api
764	//******************************************************************************
765	LPVOID VirtualAllocShared(DWORD cbSize, DWORD fdwAllocationType,
766	DWORD fdwProtect, LPSTR name)
767	{
768	LPVOID Address;
769	ULONG flag = 0, base;
770	DWORD rc;
771
772	dprintf(("VirtualAllocShared: %x %x %x %s", cbSize, fdwAllocationType, fdwProtect, name));
773
774	if (cbSize > 0x7fc00000) /* 2Gb - 4Mb */
775	{
776	dprintf(("VirtualAllocShared: size too large"));
777	SetLastError( ERROR_OUTOFMEMORY );
778	return NULL;
779	}
780
781	if (!(fdwAllocationType & (MEM_COMMIT \| MEM_RESERVE)) \|\|
782	(fdwAllocationType & ~(MEM_COMMIT \| MEM_RESERVE)))
783	{
784	dprintf(("VirtualAllocShared: Invalid parameter"));
785	SetLastError( ERROR_INVALID_PARAMETER );
786	return NULL;
787	}
788
789	if(fdwAllocationType & MEM_COMMIT)
790	{
791	dprintf(("VirtualAllocShared: commit\n"));
792	flag = PAG_COMMIT;
793	}
794
795	if(fdwProtect & PAGE_READONLY) flag \|= PAG_READ;
796	if(fdwProtect & PAGE_NOACCESS) flag \|= PAG_READ; //can't do this in OS/2
797	if(fdwProtect & PAGE_READWRITE) flag \|= (PAG_READ \| PAG_WRITE);
798	if(fdwProtect & PAGE_WRITECOPY) flag \|= (PAG_READ \| PAG_WRITE);
799
800	if(fdwProtect & PAGE_EXECUTE_READWRITE) flag \|= (PAG_EXECUTE \| PAG_WRITE \| PAG_READ);
801	if(fdwProtect & PAGE_EXECUTE_READ) flag \|= (PAG_EXECUTE \| PAG_READ);
802	if(fdwProtect & PAGE_EXECUTE) flag \|= PAG_EXECUTE;
803
804	if(fdwProtect & PAGE_GUARD) {
805	dprintf(("ERROR: PAGE_GUARD bit set for VirtualAllocShared -> we don't support this right now!"));
806	flag \|= PAG_GUARD;
807	}
808
809	//just do this if other options are used
810	if(!(flag & (PAG_READ \| PAG_WRITE \| PAG_EXECUTE)) \|\| flag == 0)
811	{
812	dprintf(("VirtualAllocShared: Unknown protection flags, default to read/write"));
813	flag \|= PAG_READ \| PAG_WRITE;
814	}
815
816	rc = OSLibDosAllocSharedMem(&Address, cbSize, flag, name);
817
818	if(rc)
819	{
820	dprintf(("DosAllocSharedMem returned %d\n", rc));
821	SetLastError( ERROR_OUTOFMEMORY );
822	return(NULL);
823	}
824
825	dprintf(("VirtualAllocShared returned %X\n", Address));
826	return(Address);
827	}

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