alloc-r0drv.cpp@ 78382

Last change on this file since 78382 was 76553, checked in by vboxsync, 6 years ago
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1	/* $Id: alloc-r0drv.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
2	/** @file
3	* IPRT - Memory Allocation, Ring-0 Driver.
4	*/
5
6	/*
7	* Copyright (C) 2006-2019 Oracle Corporation
8	*
9	* This file is part of VirtualBox Open Source Edition (OSE), as
10	* available from http://www.virtualbox.org. This file is free software;
11	* you can redistribute it and/or modify it under the terms of the GNU
12	* General Public License (GPL) as published by the Free Software
13	* Foundation, in version 2 as it comes in the "COPYING" file of the
14	* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
15	* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
16	*
17	* The contents of this file may alternatively be used under the terms
18	* of the Common Development and Distribution License Version 1.0
19	* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
20	* VirtualBox OSE distribution, in which case the provisions of the
21	* CDDL are applicable instead of those of the GPL.
22	*
23	* You may elect to license modified versions of this file under the
24	* terms and conditions of either the GPL or the CDDL or both.
25	*/
26
27
28	/*********************************************************************************************************************************
29	* Header Files *
30	*********************************************************************************************************************************/
31	#define RTMEM_NO_WRAP_TO_EF_APIS
32	#include <iprt/mem.h>
33	#include "internal/iprt.h"
34
35	#if defined(RT_ARCH_AMD64) \|\| defined(RT_ARCH_X86)
36	# include <iprt/asm-amd64-x86.h>
37	#endif
38	#include <iprt/assert.h>
39	#include <iprt/err.h>
40	#ifdef RT_MORE_STRICT
41	# include <iprt/mp.h>
42	#endif
43	#include <iprt/param.h>
44	#include <iprt/string.h>
45	#include <iprt/thread.h>
46	#include "r0drv/alloc-r0drv.h"
47
48
49	/*********************************************************************************************************************************
50	* Defined Constants And Macros *
51	*********************************************************************************************************************************/
52	#ifdef RT_STRICT
53	# define RTR0MEM_STRICT
54	#endif
55
56	#ifdef RTR0MEM_STRICT
57	# define RTR0MEM_FENCE_EXTRA 16
58	#else
59	# define RTR0MEM_FENCE_EXTRA 0
60	#endif
61
62
63	/*********************************************************************************************************************************
64	* Global Variables *
65	*********************************************************************************************************************************/
66	#ifdef RTR0MEM_STRICT
67	/** Fence data. */
68	static uint8_t const g_abFence[RTR0MEM_FENCE_EXTRA] =
69	{
70	0x77, 0x88, 0x66, 0x99, 0x55, 0xaa, 0x44, 0xbb,
71	0x33, 0xcc, 0x22, 0xdd, 0x11, 0xee, 0x00, 0xff
72	};
73	#endif
74
75
76	/**
77	* Wrapper around rtR0MemAllocEx.
78	*
79	* @returns Pointer to the allocated memory block header.
80	* @param cb The number of bytes to allocate (sans header).
81	* @param fFlags The allocation flags.
82	*/
83	DECLINLINE(PRTMEMHDR) rtR0MemAlloc(size_t cb, uint32_t fFlags)
84	{
85	PRTMEMHDR pHdr;
86	int rc = rtR0MemAllocEx(cb, fFlags, &pHdr);
87	if (RT_FAILURE(rc))
88	return NULL;
89	return pHdr;
90	}
91
92
93	RTDECL(void ) RTMemTmpAllocTag(size_t cb, const char pszTag) RT_NO_THROW_DEF
94	{
95	return RTMemAllocTag(cb, pszTag);
96	}
97	RT_EXPORT_SYMBOL(RTMemTmpAllocTag);
98
99
100	RTDECL(void ) RTMemTmpAllocZTag(size_t cb, const char pszTag) RT_NO_THROW_DEF
101	{
102	return RTMemAllocZTag(cb, pszTag);
103	}
104	RT_EXPORT_SYMBOL(RTMemTmpAllocZTag);
105
106
107	RTDECL(void) RTMemTmpFree(void *pv) RT_NO_THROW_DEF
108	{
109	return RTMemFree(pv);
110	}
111	RT_EXPORT_SYMBOL(RTMemTmpFree);
112
113
114
115
116
117	RTDECL(void ) RTMemAllocTag(size_t cb, const char pszTag) RT_NO_THROW_DEF
118	{
119	PRTMEMHDR pHdr;
120	RT_ASSERT_INTS_ON();
121	RT_NOREF_PV(pszTag);
122
123	pHdr = rtR0MemAlloc(cb + RTR0MEM_FENCE_EXTRA, 0);
124	if (pHdr)
125	{
126	#ifdef RTR0MEM_STRICT
127	pHdr->cbReq = (uint32_t)cb; Assert(pHdr->cbReq == cb);
128	memcpy((uint8_t *)(pHdr + 1) + cb, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
129	#endif
130	return pHdr + 1;
131	}
132	return NULL;
133	}
134	RT_EXPORT_SYMBOL(RTMemAllocTag);
135
136
137	RTDECL(void ) RTMemAllocZTag(size_t cb, const char pszTag) RT_NO_THROW_DEF
138	{
139	PRTMEMHDR pHdr;
140	RT_ASSERT_INTS_ON();
141	RT_NOREF_PV(pszTag);
142
143	pHdr = rtR0MemAlloc(cb + RTR0MEM_FENCE_EXTRA, RTMEMHDR_FLAG_ZEROED);
144	if (pHdr)
145	{
146	#ifdef RTR0MEM_STRICT
147	pHdr->cbReq = (uint32_t)cb; Assert(pHdr->cbReq == cb);
148	memcpy((uint8_t *)(pHdr + 1) + cb, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
149	return memset(pHdr + 1, 0, cb);
150	#else
151	return memset(pHdr + 1, 0, pHdr->cb);
152	#endif
153	}
154	return NULL;
155	}
156	RT_EXPORT_SYMBOL(RTMemAllocZTag);
157
158
159	RTDECL(void ) RTMemAllocVarTag(size_t cbUnaligned, const char pszTag)
160	{
161	size_t cbAligned;
162	if (cbUnaligned >= 16)
163	cbAligned = RT_ALIGN_Z(cbUnaligned, 16);
164	else
165	cbAligned = RT_ALIGN_Z(cbUnaligned, sizeof(void *));
166	return RTMemAllocTag(cbAligned, pszTag);
167	}
168	RT_EXPORT_SYMBOL(RTMemAllocVarTag);
169
170
171	RTDECL(void ) RTMemAllocZVarTag(size_t cbUnaligned, const char pszTag)
172	{
173	size_t cbAligned;
174	if (cbUnaligned >= 16)
175	cbAligned = RT_ALIGN_Z(cbUnaligned, 16);
176	else
177	cbAligned = RT_ALIGN_Z(cbUnaligned, sizeof(void *));
178	return RTMemAllocZTag(cbAligned, pszTag);
179	}
180	RT_EXPORT_SYMBOL(RTMemAllocZVarTag);
181
182
183	RTDECL(void ) RTMemReallocTag(void pvOld, size_t cbNew, const char *pszTag) RT_NO_THROW_DEF
184	{
185	PRTMEMHDR pHdrOld;
186
187	/* Free. */
188	if (!cbNew && pvOld)
189	{
190	RTMemFree(pvOld);
191	return NULL;
192	}
193
194	/* Alloc. */
195	if (!pvOld)
196	return RTMemAllocTag(cbNew, pszTag);
197
198	/*
199	* Realloc.
200	*/
201	pHdrOld = (PRTMEMHDR)pvOld - 1;
202	RT_ASSERT_PREEMPTIBLE();
203
204	if (pHdrOld->u32Magic == RTMEMHDR_MAGIC)
205	{
206	PRTMEMHDR pHdrNew;
207
208	/* If there is sufficient space in the old block and we don't cause
209	substantial internal fragmentation, reuse the old block. */
210	if ( pHdrOld->cb >= cbNew + RTR0MEM_FENCE_EXTRA
211	&& pHdrOld->cb - (cbNew + RTR0MEM_FENCE_EXTRA) <= 128)
212	{
213	pHdrOld->cbReq = (uint32_t)cbNew; Assert(pHdrOld->cbReq == cbNew);
214	#ifdef RTR0MEM_STRICT
215	memcpy((uint8_t *)(pHdrOld + 1) + cbNew, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
216	#endif
217	return pvOld;
218	}
219
220	/* Allocate a new block and copy over the content. */
221	pHdrNew = rtR0MemAlloc(cbNew + RTR0MEM_FENCE_EXTRA, 0);
222	if (pHdrNew)
223	{
224	size_t cbCopy = RT_MIN(pHdrOld->cb, pHdrNew->cb);
225	memcpy(pHdrNew + 1, pvOld, cbCopy);
226	#ifdef RTR0MEM_STRICT
227	pHdrNew->cbReq = (uint32_t)cbNew; Assert(pHdrNew->cbReq == cbNew);
228	memcpy((uint8_t *)(pHdrNew + 1) + cbNew, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
229	AssertReleaseMsg(!memcmp((uint8_t *)(pHdrOld + 1) + pHdrOld->cbReq, &g_abFence[0], RTR0MEM_FENCE_EXTRA),
230	("pHdr=%p pvOld=%p cbReq=%u cb=%u cbNew=%zu fFlags=%#x\n"
231	"fence: %.*Rhxs\n"
232	"expected: %.*Rhxs\n",
233	pHdrOld, pvOld, pHdrOld->cbReq, pHdrOld->cb, cbNew, pHdrOld->fFlags,
234	RTR0MEM_FENCE_EXTRA, (uint8_t *)(pHdrOld + 1) + pHdrOld->cbReq,
235	RTR0MEM_FENCE_EXTRA, &g_abFence[0]));
236	#endif
237	rtR0MemFree(pHdrOld);
238	return pHdrNew + 1;
239	}
240	}
241	else
242	AssertMsgFailed(("pHdrOld->u32Magic=%RX32 pvOld=%p cbNew=%#zx\n", pHdrOld->u32Magic, pvOld, cbNew));
243
244	return NULL;
245	}
246	RT_EXPORT_SYMBOL(RTMemReallocTag);
247
248
249	RTDECL(void) RTMemFree(void *pv) RT_NO_THROW_DEF
250	{
251	PRTMEMHDR pHdr;
252	RT_ASSERT_INTS_ON();
253
254	if (!pv)
255	return;
256	pHdr = (PRTMEMHDR)pv - 1;
257	if (pHdr->u32Magic == RTMEMHDR_MAGIC)
258	{
259	Assert(!(pHdr->fFlags & RTMEMHDR_FLAG_ALLOC_EX));
260	Assert(!(pHdr->fFlags & RTMEMHDR_FLAG_EXEC));
261	#ifdef RTR0MEM_STRICT
262	AssertReleaseMsg(!memcmp((uint8_t *)(pHdr + 1) + pHdr->cbReq, &g_abFence[0], RTR0MEM_FENCE_EXTRA),
263	("pHdr=%p pv=%p cbReq=%u cb=%u fFlags=%#x\n"
264	"fence: %.*Rhxs\n"
265	"expected: %.*Rhxs\n",
266	pHdr, pv, pHdr->cbReq, pHdr->cb, pHdr->fFlags,
267	RTR0MEM_FENCE_EXTRA, (uint8_t *)(pHdr + 1) + pHdr->cbReq,
268	RTR0MEM_FENCE_EXTRA, &g_abFence[0]));
269	#endif
270	rtR0MemFree(pHdr);
271	}
272	else
273	AssertMsgFailed(("pHdr->u32Magic=%RX32 pv=%p\n", pHdr->u32Magic, pv));
274	}
275	RT_EXPORT_SYMBOL(RTMemFree);
276
277
278
279
280
281
282	RTDECL(void ) RTMemExecAllocTag(size_t cb, const char pszTag) RT_NO_THROW_DEF
283	{
284	PRTMEMHDR pHdr;
285	#ifdef RT_OS_SOLARIS /** @todo figure out why */
286	RT_ASSERT_INTS_ON();
287	#else
288	RT_ASSERT_PREEMPTIBLE();
289	#endif
290	RT_NOREF_PV(pszTag);
291
292
293	pHdr = rtR0MemAlloc(cb + RTR0MEM_FENCE_EXTRA, RTMEMHDR_FLAG_EXEC);
294	if (pHdr)
295	{
296	#ifdef RTR0MEM_STRICT
297	pHdr->cbReq = (uint32_t)cb; Assert(pHdr->cbReq == cb);
298	memcpy((uint8_t *)(pHdr + 1) + cb, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
299	#endif
300	return pHdr + 1;
301	}
302	return NULL;
303	}
304	RT_EXPORT_SYMBOL(RTMemExecAllocTag);
305
306
307	RTDECL(void) RTMemExecFree(void *pv, size_t cb) RT_NO_THROW_DEF
308	{
309	PRTMEMHDR pHdr;
310	RT_ASSERT_INTS_ON();
311	RT_NOREF_PV(cb);
312
313	if (!pv)
314	return;
315	pHdr = (PRTMEMHDR)pv - 1;
316	if (pHdr->u32Magic == RTMEMHDR_MAGIC)
317	{
318	Assert(!(pHdr->fFlags & RTMEMHDR_FLAG_ALLOC_EX));
319	#ifdef RTR0MEM_STRICT
320	AssertReleaseMsg(!memcmp((uint8_t *)(pHdr + 1) + pHdr->cbReq, &g_abFence[0], RTR0MEM_FENCE_EXTRA),
321	("pHdr=%p pv=%p cbReq=%u cb=%u fFlags=%#x\n"
322	"fence: %.*Rhxs\n"
323	"expected: %.*Rhxs\n",
324	pHdr, pv, pHdr->cbReq, pHdr->cb, pHdr->fFlags,
325	RTR0MEM_FENCE_EXTRA, (uint8_t *)(pHdr + 1) + pHdr->cbReq,
326	RTR0MEM_FENCE_EXTRA, &g_abFence[0]));
327	#endif
328	rtR0MemFree(pHdr);
329	}
330	else
331	AssertMsgFailed(("pHdr->u32Magic=%RX32 pv=%p\n", pHdr->u32Magic, pv));
332	}
333	RT_EXPORT_SYMBOL(RTMemExecFree);
334
335
336
337
338	RTDECL(int) RTMemAllocExTag(size_t cb, size_t cbAlignment, uint32_t fFlags, const char pszTag, void *ppv) RT_NO_THROW_DEF
339	{
340	uint32_t fHdrFlags = RTMEMHDR_FLAG_ALLOC_EX;
341	PRTMEMHDR pHdr;
342	int rc;
343	RT_NOREF_PV(pszTag);
344
345	RT_ASSERT_PREEMPT_CPUID_VAR();
346	if (!(fFlags & RTMEMALLOCEX_FLAGS_ANY_CTX_ALLOC))
347	RT_ASSERT_INTS_ON();
348
349	/*
350	* Fake up some alignment support.
351	*/
352	AssertMsgReturn(cbAlignment <= sizeof(void *), ("%zu (%#x)\n", cbAlignment, cbAlignment), VERR_UNSUPPORTED_ALIGNMENT);
353	if (cb < cbAlignment)
354	cb = cbAlignment;
355
356	/*
357	* Validate and convert flags.
358	*/
359	AssertMsgReturn(!(fFlags & ~RTMEMALLOCEX_FLAGS_VALID_MASK_R0), ("%#x\n", fFlags), VERR_INVALID_PARAMETER);
360	if (fFlags & RTMEMALLOCEX_FLAGS_ZEROED)
361	fHdrFlags \|= RTMEMHDR_FLAG_ZEROED;
362	if (fFlags & RTMEMALLOCEX_FLAGS_EXEC)
363	fHdrFlags \|= RTMEMHDR_FLAG_EXEC;
364	if (fFlags & RTMEMALLOCEX_FLAGS_ANY_CTX_ALLOC)
365	fHdrFlags \|= RTMEMHDR_FLAG_ANY_CTX_ALLOC;
366	if (fFlags & RTMEMALLOCEX_FLAGS_ANY_CTX_FREE)
367	fHdrFlags \|= RTMEMHDR_FLAG_ANY_CTX_FREE;
368
369	/*
370	* Do the allocation.
371	*/
372	rc = rtR0MemAllocEx(cb + RTR0MEM_FENCE_EXTRA, fHdrFlags, &pHdr);
373	if (RT_SUCCESS(rc))
374	{
375	void *pv;
376
377	Assert(pHdr->cbReq == cb + RTR0MEM_FENCE_EXTRA);
378	Assert((pHdr->fFlags & fFlags) == fFlags);
379
380	/*
381	* Calc user pointer, initialize the memory if requested, and if
382	* memory strictness is enable set up the fence.
383	*/
384	pv = pHdr + 1;
385	*ppv = pv;
386	if (fFlags & RTMEMHDR_FLAG_ZEROED)
387	memset(pv, 0, pHdr->cb);
388
389	#ifdef RTR0MEM_STRICT
390	pHdr->cbReq = (uint32_t)cb;
391	memcpy((uint8_t *)pv + cb, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
392	#endif
393	}
394	else if (rc == VERR_NO_MEMORY && (fFlags & RTMEMALLOCEX_FLAGS_EXEC))
395	rc = VERR_NO_EXEC_MEMORY;
396
397	RT_ASSERT_PREEMPT_CPUID();
398	return rc;
399	}
400	RT_EXPORT_SYMBOL(RTMemAllocExTag);
401
402
403	RTDECL(void) RTMemFreeEx(void *pv, size_t cb) RT_NO_THROW_DEF
404	{
405	PRTMEMHDR pHdr;
406	RT_NOREF_PV(cb);
407
408	if (!pv)
409	return;
410
411	AssertPtr(pv);
412	pHdr = (PRTMEMHDR)pv - 1;
413	if (pHdr->u32Magic == RTMEMHDR_MAGIC)
414	{
415	RT_ASSERT_PREEMPT_CPUID_VAR();
416
417	Assert(pHdr->fFlags & RTMEMHDR_FLAG_ALLOC_EX);
418	if (!(pHdr->fFlags & RTMEMHDR_FLAG_ANY_CTX_FREE))
419	RT_ASSERT_INTS_ON();
420	AssertMsg(pHdr->cbReq == cb, ("cbReq=%zu cb=%zu\n", pHdr->cb, cb));
421
422	#ifdef RTR0MEM_STRICT
423	AssertReleaseMsg(!memcmp((uint8_t *)(pHdr + 1) + pHdr->cbReq, &g_abFence[0], RTR0MEM_FENCE_EXTRA),
424	("pHdr=%p pv=%p cbReq=%u cb=%u fFlags=%#x\n"
425	"fence: %.*Rhxs\n"
426	"expected: %.*Rhxs\n",
427	pHdr, pv, pHdr->cbReq, pHdr->cb, pHdr->fFlags,
428	RTR0MEM_FENCE_EXTRA, (uint8_t *)(pHdr + 1) + pHdr->cbReq,
429	RTR0MEM_FENCE_EXTRA, &g_abFence[0]));
430	#endif
431	rtR0MemFree(pHdr);
432	RT_ASSERT_PREEMPT_CPUID();
433	}
434	else
435	AssertMsgFailed(("pHdr->u32Magic=%RX32 pv=%p\n", pHdr->u32Magic, pv));
436	}
437	RT_EXPORT_SYMBOL(RTMemFreeEx);
438

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source: vbox/trunk/src/VBox/Runtime/r0drv/alloc-r0drv.cpp@ 78382

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