VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/freebsd/alloc-freebsd.cpp@ 8649

Last change on this file since 8649 was 8245, checked in by vboxsync, 17 years ago

rebranding: IPRT files again.

  • Property svn:keywords set to Id
File size: 5.5 KB
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1/* $Id: alloc-freebsd.cpp 8245 2008-04-21 17:24:28Z vboxsync $ */
2/** @file
3 * IPRT - Memory Allocation, POSIX.
4 */
5
6/*
7 * Copyright (C) 2006-2007 Sun Microsystems, Inc.
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
27 * Clara, CA 95054 USA or visit http://www.sun.com if you need
28 * additional information or have any questions.
29 */
30
31
32/*******************************************************************************
33* Header Files *
34*******************************************************************************/
35#include <iprt/alloc.h>
36#include <iprt/assert.h>
37#include <iprt/param.h>
38#include <iprt/err.h>
39#include <iprt/string.h>
40
41#include <stdlib.h>
42#include <errno.h>
43#include <sys/mman.h>
44
45
46/**
47 * Allocates memory which may contain code.
48 *
49 * @returns Pointer to the allocated memory.
50 * @returns NULL on failure.
51 * @param cb Size in bytes of the memory block to allocate.
52 */
53RTDECL(void *) RTMemExecAlloc(size_t cb)
54{
55 /*
56 * Allocate first.
57 */
58 AssertMsg(cb, ("Allocating ZERO bytes is really not a good idea! Good luck with the next assertion!\n"));
59 cb = RT_ALIGN_Z(cb, PAGE_SIZE);
60 void *pv = RTMemPageAlloc(cb);
61 if (pv)
62 {
63 /*
64 * Add PROT_EXEC flag to the page(s).
65 */
66 memset(pv, 0xcc, cb);
67 int rc = mprotect(pv, cb, PROT_READ | PROT_WRITE | PROT_EXEC);
68 if (rc)
69 {
70 AssertMsgFailed(("mprotect(%p, %#x,,) -> rc=%d, errno=%d\n", pv, cb, rc, errno));
71 free(pv);
72 pv = NULL;
73 }
74 }
75 return pv;
76}
77
78
79/**
80 * Free executable/read/write memory allocated by RTMemExecAlloc().
81 *
82 * @param pv Pointer to memory block.
83 */
84RTDECL(void) RTMemExecFree(void *pv)
85{
86 return RTMemPageFree(pv);
87}
88
89
90/**
91 * Allocate page aligned memory.
92 *
93 * @returns Pointer to the allocated memory.
94 * @returns NULL if we're out of memory.
95 * @param cb Size of the memory block. Will be rounded up to page size.
96 */
97RTDECL(void *) RTMemPageAlloc(size_t cb)
98{
99 cb = RT_ALIGN_Z(cb, PAGE_SIZE);
100 void *pv = malloc(cb);
101 AssertReleaseMsgReturn(RT_ALIGN_P(pv, PAGE_SIZE) == pv,
102 ("malloc(%zu) -> %p; expected page aligned!\n", cb, pv),
103 NULL);
104 return pv;
105}
106
107
108/**
109 * Allocate zero'ed page aligned memory.
110 *
111 * @returns Pointer to the allocated memory.
112 * @returns NULL if we're out of memory.
113 * @param cb Size of the memory block. Will be rounded up to page size.
114 */
115RTDECL(void *) RTMemPageAllocZ(size_t cb)
116{
117 cb = RT_ALIGN_Z(cb, PAGE_SIZE);
118 void *pv = RTMemPageAlloc(cb);
119 if (pv)
120 bzero(pv, RT_ALIGN_Z(cb, PAGE_SIZE));
121 return pv;
122}
123
124
125/**
126 * Free a memory block allocated with RTMemPageAlloc() or RTMemPageAllocZ().
127 *
128 * @param pv Pointer to the block as it was returned by the allocation function.
129 * NULL will be ignored.
130 */
131RTDECL(void) RTMemPageFree(void *pv)
132{
133 if (pv)
134 free(pv);
135}
136
137
138/**
139 * Change the page level protection of a memory region.
140 *
141 * @returns iprt status code.
142 * @param pv Start of the region. Will be rounded down to nearest page boundary.
143 * @param cb Size of the region. Will be rounded up to the nearest page boundary.
144 * @param fProtect The new protection, a combination of the RTMEM_PROT_* defines.
145 */
146RTDECL(int) RTMemProtect(void *pv, size_t cb, unsigned fProtect)
147{
148 /*
149 * Validate input.
150 */
151 if (cb == 0)
152 {
153 AssertMsgFailed(("!cb\n"));
154 return VERR_INVALID_PARAMETER;
155 }
156 if (fProtect & ~(RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC))
157 {
158 AssertMsgFailed(("fProtect=%#x\n", fProtect));
159 return VERR_INVALID_PARAMETER;
160 }
161
162 /*
163 * Convert the flags.
164 */
165 int fProt;
166#if RTMEM_PROT_NONE == PROT_NONE \
167 && RTMEM_PROT_READ == PROT_READ \
168 && RTMEM_PROT_WRITE == PROT_WRITE \
169 && RTMEM_PROT_EXEC == PROT_EXEC
170 fProt = fProtect;
171#else
172 Assert(!RTMEM_PROT_NONE);
173 if (!fProtect)
174 fProt = PROT_NONE;
175 else
176 {
177 fProt = 0;
178 if (fProtect & RTMEM_PROT_READ)
179 fProt |= PROT_READ;
180 if (fProtect & RTMEM_PROT_WRITE)
181 fProt |= PROT_WRITE;
182 if (fProtect & RTMEM_PROT_EXEC)
183 fProt |= PROT_EXEC;
184 }
185#endif
186
187 /*
188 * Align the request.
189 */
190 cb += (uintptr_t)pv & PAGE_OFFSET_MASK;
191 pv = (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK);
192
193 /*
194 * Change the page attributes.
195 */
196 int rc = mprotect(pv, cb, fProt);
197 if (!rc)
198 return rc;
199 return RTErrConvertFromErrno(errno);
200}
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