alloc-r0drv.cpp@ 99743

Last change on this file since 99743 was 98103, checked in by vboxsync, 2 years ago
Copyright year updates by scm.
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1	/* $Id: alloc-r0drv.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2	/** @file
3	* IPRT - Memory Allocation, Ring-0 Driver.
4	*/
5
6	/*
7	* Copyright (C) 2006-2023 Oracle and/or its affiliates.
8	*
9	* This file is part of VirtualBox base platform packages, as
10	* available from https://www.virtualbox.org.
11	*
12	* This program is free software; you can redistribute it and/or
13	* modify it under the terms of the GNU General Public License
14	* as published by the Free Software Foundation, in version 3 of the
15	* License.
16	*
17	* This program is distributed in the hope that it will be useful, but
18	* WITHOUT ANY WARRANTY; without even the implied warranty of
19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20	* General Public License for more details.
21	*
22	* You should have received a copy of the GNU General Public License
23	* along with this program; if not, see <https://www.gnu.org/licenses>.
24	*
25	* The contents of this file may alternatively be used under the terms
26	* of the Common Development and Distribution License Version 1.0
27	* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28	* in the VirtualBox distribution, in which case the provisions of the
29	* CDDL are applicable instead of those of the GPL.
30	*
31	* You may elect to license modified versions of this file under the
32	* terms and conditions of either the GPL or the CDDL or both.
33	*
34	* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35	*/
36
37
38	/*********************************************************************************************************************************
39	* Header Files *
40	*********************************************************************************************************************************/
41	#define RTMEM_NO_WRAP_TO_EF_APIS
42	#include <iprt/mem.h>
43	#include "internal/iprt.h"
44
45	#if defined(RT_ARCH_AMD64) \|\| defined(RT_ARCH_X86)
46	# include <iprt/asm-amd64-x86.h>
47	#endif
48	#include <iprt/assert.h>
49	#include <iprt/err.h>
50	#ifdef RT_MORE_STRICT
51	# include <iprt/mp.h>
52	#endif
53	#include <iprt/param.h>
54	#include <iprt/string.h>
55	#include <iprt/thread.h>
56	#include "r0drv/alloc-r0drv.h"
57
58
59	/*********************************************************************************************************************************
60	* Defined Constants And Macros *
61	*********************************************************************************************************************************/
62	#ifdef RT_STRICT
63	# define RTR0MEM_STRICT
64	#endif
65
66	#ifdef RTR0MEM_STRICT
67	# define RTR0MEM_FENCE_EXTRA 16
68	#else
69	# define RTR0MEM_FENCE_EXTRA 0
70	#endif
71
72
73	/*********************************************************************************************************************************
74	* Global Variables *
75	*********************************************************************************************************************************/
76	#ifdef RTR0MEM_STRICT
77	/** Fence data. */
78	static uint8_t const g_abFence[RTR0MEM_FENCE_EXTRA] =
79	{
80	0x77, 0x88, 0x66, 0x99, 0x55, 0xaa, 0x44, 0xbb,
81	0x33, 0xcc, 0x22, 0xdd, 0x11, 0xee, 0x00, 0xff
82	};
83	#endif
84
85
86	/**
87	* Wrapper around rtR0MemAllocEx.
88	*
89	* @returns Pointer to the allocated memory block header.
90	* @param cb The number of bytes to allocate (sans header).
91	* @param fFlags The allocation flags.
92	*/
93	DECLINLINE(PRTMEMHDR) rtR0MemAlloc(size_t cb, uint32_t fFlags)
94	{
95	PRTMEMHDR pHdr;
96	int rc = rtR0MemAllocEx(cb, fFlags, &pHdr);
97	if (RT_FAILURE(rc))
98	return NULL;
99	return pHdr;
100	}
101
102
103	RTDECL(void ) RTMemTmpAllocTag(size_t cb, const char pszTag) RT_NO_THROW_DEF
104	{
105	return RTMemAllocTag(cb, pszTag);
106	}
107	RT_EXPORT_SYMBOL(RTMemTmpAllocTag);
108
109
110	RTDECL(void ) RTMemTmpAllocZTag(size_t cb, const char pszTag) RT_NO_THROW_DEF
111	{
112	return RTMemAllocZTag(cb, pszTag);
113	}
114	RT_EXPORT_SYMBOL(RTMemTmpAllocZTag);
115
116
117	RTDECL(void) RTMemTmpFree(void *pv) RT_NO_THROW_DEF
118	{
119	return RTMemFree(pv);
120	}
121	RT_EXPORT_SYMBOL(RTMemTmpFree);
122
123
124	RTDECL(void) RTMemTmpFreeZ(void *pv, size_t cb) RT_NO_THROW_DEF
125	{
126	return RTMemFreeZ(pv, cb);
127	}
128	RT_EXPORT_SYMBOL(RTMemTmpFreeZ);
129
130
131
132
133
134	RTDECL(void ) RTMemAllocTag(size_t cb, const char pszTag) RT_NO_THROW_DEF
135	{
136	PRTMEMHDR pHdr;
137	RT_ASSERT_INTS_ON();
138	RT_NOREF_PV(pszTag);
139
140	pHdr = rtR0MemAlloc(cb + RTR0MEM_FENCE_EXTRA, 0);
141	if (pHdr)
142	{
143	#ifdef RTR0MEM_STRICT
144	pHdr->cbReq = (uint32_t)cb; Assert(pHdr->cbReq == cb);
145	memcpy((uint8_t *)(pHdr + 1) + cb, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
146	#endif
147	return pHdr + 1;
148	}
149	return NULL;
150	}
151	RT_EXPORT_SYMBOL(RTMemAllocTag);
152
153
154	RTDECL(void ) RTMemAllocZTag(size_t cb, const char pszTag) RT_NO_THROW_DEF
155	{
156	PRTMEMHDR pHdr;
157	RT_ASSERT_INTS_ON();
158	RT_NOREF_PV(pszTag);
159
160	pHdr = rtR0MemAlloc(cb + RTR0MEM_FENCE_EXTRA, RTMEMHDR_FLAG_ZEROED);
161	if (pHdr)
162	{
163	#ifdef RTR0MEM_STRICT
164	pHdr->cbReq = (uint32_t)cb; Assert(pHdr->cbReq == cb);
165	memcpy((uint8_t *)(pHdr + 1) + cb, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
166	return memset(pHdr + 1, 0, cb);
167	#else
168	return memset(pHdr + 1, 0, pHdr->cb);
169	#endif
170	}
171	return NULL;
172	}
173	RT_EXPORT_SYMBOL(RTMemAllocZTag);
174
175
176	RTDECL(void ) RTMemAllocVarTag(size_t cbUnaligned, const char pszTag)
177	{
178	size_t cbAligned;
179	if (cbUnaligned >= 16)
180	cbAligned = RT_ALIGN_Z(cbUnaligned, 16);
181	else
182	cbAligned = RT_ALIGN_Z(cbUnaligned, sizeof(void *));
183	return RTMemAllocTag(cbAligned, pszTag);
184	}
185	RT_EXPORT_SYMBOL(RTMemAllocVarTag);
186
187
188	RTDECL(void ) RTMemAllocZVarTag(size_t cbUnaligned, const char pszTag)
189	{
190	size_t cbAligned;
191	if (cbUnaligned >= 16)
192	cbAligned = RT_ALIGN_Z(cbUnaligned, 16);
193	else
194	cbAligned = RT_ALIGN_Z(cbUnaligned, sizeof(void *));
195	return RTMemAllocZTag(cbAligned, pszTag);
196	}
197	RT_EXPORT_SYMBOL(RTMemAllocZVarTag);
198
199
200	RTDECL(void ) RTMemReallocTag(void pvOld, size_t cbNew, const char *pszTag) RT_NO_THROW_DEF
201	{
202	PRTMEMHDR pHdrOld;
203
204	/* Free. */
205	if (!cbNew && pvOld)
206	{
207	RTMemFree(pvOld);
208	return NULL;
209	}
210
211	/* Alloc. */
212	if (!pvOld)
213	return RTMemAllocTag(cbNew, pszTag);
214
215	/*
216	* Realloc.
217	*/
218	pHdrOld = (PRTMEMHDR)pvOld - 1;
219	RT_ASSERT_PREEMPTIBLE();
220
221	if (pHdrOld->u32Magic == RTMEMHDR_MAGIC)
222	{
223	PRTMEMHDR pHdrNew;
224
225	/* If there is sufficient space in the old block and we don't cause
226	substantial internal fragmentation, reuse the old block. */
227	if ( pHdrOld->cb >= cbNew + RTR0MEM_FENCE_EXTRA
228	&& pHdrOld->cb - (cbNew + RTR0MEM_FENCE_EXTRA) <= 128)
229	{
230	pHdrOld->cbReq = (uint32_t)cbNew; Assert(pHdrOld->cbReq == cbNew);
231	#ifdef RTR0MEM_STRICT
232	memcpy((uint8_t *)(pHdrOld + 1) + cbNew, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
233	#endif
234	return pvOld;
235	}
236
237	/* Allocate a new block and copy over the content. */
238	pHdrNew = rtR0MemAlloc(cbNew + RTR0MEM_FENCE_EXTRA, 0);
239	if (pHdrNew)
240	{
241	size_t cbCopy = RT_MIN(pHdrOld->cb, pHdrNew->cb);
242	memcpy(pHdrNew + 1, pvOld, cbCopy);
243	#ifdef RTR0MEM_STRICT
244	pHdrNew->cbReq = (uint32_t)cbNew; Assert(pHdrNew->cbReq == cbNew);
245	memcpy((uint8_t *)(pHdrNew + 1) + cbNew, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
246	AssertReleaseMsg(!memcmp((uint8_t *)(pHdrOld + 1) + pHdrOld->cbReq, &g_abFence[0], RTR0MEM_FENCE_EXTRA),
247	("pHdr=%p pvOld=%p cbReq=%u cb=%u cbNew=%zu fFlags=%#x\n"
248	"fence: %.*Rhxs\n"
249	"expected: %.*Rhxs\n",
250	pHdrOld, pvOld, pHdrOld->cbReq, pHdrOld->cb, cbNew, pHdrOld->fFlags,
251	RTR0MEM_FENCE_EXTRA, (uint8_t *)(pHdrOld + 1) + pHdrOld->cbReq,
252	RTR0MEM_FENCE_EXTRA, &g_abFence[0]));
253	#endif
254	rtR0MemFree(pHdrOld);
255	return pHdrNew + 1;
256	}
257	}
258	else
259	AssertMsgFailed(("pHdrOld->u32Magic=%RX32 pvOld=%p cbNew=%#zx\n", pHdrOld->u32Magic, pvOld, cbNew));
260
261	return NULL;
262	}
263	RT_EXPORT_SYMBOL(RTMemReallocTag);
264
265
266	RTDECL(void) RTMemFree(void *pv) RT_NO_THROW_DEF
267	{
268	PRTMEMHDR pHdr;
269	RT_ASSERT_INTS_ON();
270
271	if (!pv)
272	return;
273	pHdr = (PRTMEMHDR)pv - 1;
274	if (pHdr->u32Magic == RTMEMHDR_MAGIC)
275	{
276	Assert(!(pHdr->fFlags & RTMEMHDR_FLAG_ALLOC_EX));
277	#ifdef RTR0MEM_STRICT
278	AssertReleaseMsg(!memcmp((uint8_t *)(pHdr + 1) + pHdr->cbReq, &g_abFence[0], RTR0MEM_FENCE_EXTRA),
279	("pHdr=%p pv=%p cbReq=%u cb=%u fFlags=%#x\n"
280	"fence: %.*Rhxs\n"
281	"expected: %.*Rhxs\n",
282	pHdr, pv, pHdr->cbReq, pHdr->cb, pHdr->fFlags,
283	RTR0MEM_FENCE_EXTRA, (uint8_t *)(pHdr + 1) + pHdr->cbReq,
284	RTR0MEM_FENCE_EXTRA, &g_abFence[0]));
285	#endif
286	rtR0MemFree(pHdr);
287	}
288	else
289	AssertMsgFailed(("pHdr->u32Magic=%RX32 pv=%p\n", pHdr->u32Magic, pv));
290	}
291	RT_EXPORT_SYMBOL(RTMemFree);
292
293
294	RTDECL(void) RTMemFreeZ(void *pv, size_t cb) RT_NO_THROW_DEF
295	{
296	PRTMEMHDR pHdr;
297	RT_ASSERT_INTS_ON();
298
299	if (!pv)
300	return;
301	pHdr = (PRTMEMHDR)pv - 1;
302	if (pHdr->u32Magic == RTMEMHDR_MAGIC)
303	{
304	Assert(!(pHdr->fFlags & RTMEMHDR_FLAG_ALLOC_EX));
305	#ifdef RTR0MEM_STRICT
306	AssertReleaseMsg(!memcmp((uint8_t *)(pHdr + 1) + pHdr->cbReq, &g_abFence[0], RTR0MEM_FENCE_EXTRA),
307	("pHdr=%p pv=%p cbReq=%u cb=%u fFlags=%#x\n"
308	"fence: %.*Rhxs\n"
309	"expected: %.*Rhxs\n",
310	pHdr, pv, pHdr->cbReq, pHdr->cb, pHdr->fFlags,
311	RTR0MEM_FENCE_EXTRA, (uint8_t *)(pHdr + 1) + pHdr->cbReq,
312	RTR0MEM_FENCE_EXTRA, &g_abFence[0]));
313	#endif
314	AssertMsgStmt(cb == pHdr->cbReq, ("cb=%#zx cbReq=%#x\n", cb, pHdr->cbReq), cb = pHdr->cbReq);
315	RT_BZERO(pv, cb);
316	rtR0MemFree(pHdr);
317	}
318	else
319	AssertMsgFailed(("pHdr->u32Magic=%RX32 pv=%p\n", pHdr->u32Magic, pv));
320	}
321	RT_EXPORT_SYMBOL(RTMemFreeZ);
322
323
324	RTDECL(int) RTMemAllocExTag(size_t cb, size_t cbAlignment, uint32_t fFlags, const char pszTag, void *ppv) RT_NO_THROW_DEF
325	{
326	uint32_t fHdrFlags = RTMEMHDR_FLAG_ALLOC_EX;
327	PRTMEMHDR pHdr;
328	int rc;
329	RT_NOREF_PV(pszTag);
330
331	RT_ASSERT_PREEMPT_CPUID_VAR();
332	if (!(fFlags & RTMEMALLOCEX_FLAGS_ANY_CTX_ALLOC))
333	RT_ASSERT_INTS_ON();
334	AssertReturn(!(fFlags & RTMEMALLOCEX_FLAGS_EXEC), VERR_INVALID_FLAGS);
335
336	/*
337	* Fake up some alignment support.
338	*/
339	AssertMsgReturn(cbAlignment <= sizeof(void *), ("%zu (%#x)\n", cbAlignment, cbAlignment), VERR_UNSUPPORTED_ALIGNMENT);
340	if (cb < cbAlignment)
341	cb = cbAlignment;
342
343	/*
344	* Validate and convert flags.
345	*/
346	AssertMsgReturn(!(fFlags & ~RTMEMALLOCEX_FLAGS_VALID_MASK_R0), ("%#x\n", fFlags), VERR_INVALID_PARAMETER);
347	if (fFlags & RTMEMALLOCEX_FLAGS_ZEROED)
348	fHdrFlags \|= RTMEMHDR_FLAG_ZEROED;
349	if (fFlags & RTMEMALLOCEX_FLAGS_ANY_CTX_ALLOC)
350	fHdrFlags \|= RTMEMHDR_FLAG_ANY_CTX_ALLOC;
351	if (fFlags & RTMEMALLOCEX_FLAGS_ANY_CTX_FREE)
352	fHdrFlags \|= RTMEMHDR_FLAG_ANY_CTX_FREE;
353
354	/*
355	* Do the allocation.
356	*/
357	rc = rtR0MemAllocEx(cb + RTR0MEM_FENCE_EXTRA, fHdrFlags, &pHdr);
358	if (RT_SUCCESS(rc))
359	{
360	void *pv;
361
362	Assert(pHdr->cbReq == cb + RTR0MEM_FENCE_EXTRA);
363	Assert((pHdr->fFlags & fFlags) == fFlags);
364
365	/*
366	* Calc user pointer, initialize the memory if requested, and if
367	* memory strictness is enable set up the fence.
368	*/
369	pv = pHdr + 1;
370	*ppv = pv;
371	if (fFlags & RTMEMHDR_FLAG_ZEROED)
372	memset(pv, 0, pHdr->cb);
373
374	#ifdef RTR0MEM_STRICT
375	pHdr->cbReq = (uint32_t)cb;
376	memcpy((uint8_t *)pv + cb, &g_abFence[0], RTR0MEM_FENCE_EXTRA);
377	#endif
378	}
379
380	RT_ASSERT_PREEMPT_CPUID();
381	return rc;
382	}
383	RT_EXPORT_SYMBOL(RTMemAllocExTag);
384
385
386	RTDECL(void) RTMemFreeEx(void *pv, size_t cb) RT_NO_THROW_DEF
387	{
388	PRTMEMHDR pHdr;
389	RT_NOREF_PV(cb);
390
391	if (!pv)
392	return;
393
394	AssertPtr(pv);
395	pHdr = (PRTMEMHDR)pv - 1;
396	if (pHdr->u32Magic == RTMEMHDR_MAGIC)
397	{
398	RT_ASSERT_PREEMPT_CPUID_VAR();
399
400	Assert(pHdr->fFlags & RTMEMHDR_FLAG_ALLOC_EX);
401	if (!(pHdr->fFlags & RTMEMHDR_FLAG_ANY_CTX_FREE))
402	RT_ASSERT_INTS_ON();
403	AssertMsg(pHdr->cbReq == cb, ("cbReq=%zu cb=%zu\n", pHdr->cb, cb));
404
405	#ifdef RTR0MEM_STRICT
406	AssertReleaseMsg(!memcmp((uint8_t *)(pHdr + 1) + pHdr->cbReq, &g_abFence[0], RTR0MEM_FENCE_EXTRA),
407	("pHdr=%p pv=%p cbReq=%u cb=%u fFlags=%#x\n"
408	"fence: %.*Rhxs\n"
409	"expected: %.*Rhxs\n",
410	pHdr, pv, pHdr->cbReq, pHdr->cb, pHdr->fFlags,
411	RTR0MEM_FENCE_EXTRA, (uint8_t *)(pHdr + 1) + pHdr->cbReq,
412	RTR0MEM_FENCE_EXTRA, &g_abFence[0]));
413	#endif
414	rtR0MemFree(pHdr);
415	RT_ASSERT_PREEMPT_CPUID();
416	}
417	else
418	AssertMsgFailed(("pHdr->u32Magic=%RX32 pv=%p\n", pHdr->u32Magic, pv));
419	}
420	RT_EXPORT_SYMBOL(RTMemFreeEx);
421

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source: vbox/trunk/src/VBox/Runtime/r0drv/alloc-r0drv.cpp@ 99743

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