| 1 | /* $Id: alloc-freebsd.cpp 21292 2009-07-07 08:00:14Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - Memory Allocation, POSIX.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2007 Sun Microsystems, Inc.
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | *
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| 26 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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| 27 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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| 28 | * additional information or have any questions.
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| 29 | */
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| 30 |
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| 31 |
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| 32 | /*******************************************************************************
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| 33 | * Header Files *
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| 34 | *******************************************************************************/
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| 35 | #include <iprt/alloc.h>
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| 36 | #include <iprt/assert.h>
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| 37 | #include <iprt/param.h>
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| 38 | #include <iprt/err.h>
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| 39 | #include <iprt/string.h>
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| 40 |
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| 41 | #include <stdlib.h>
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| 42 | #include <errno.h>
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| 43 | #include <sys/mman.h>
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| 44 |
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| 45 |
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| 46 | /**
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| 47 | * Allocates memory which may contain code.
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| 48 | *
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| 49 | * @returns Pointer to the allocated memory.
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| 50 | * @returns NULL on failure.
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| 51 | * @param cb Size in bytes of the memory block to allocate.
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| 52 | */
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| 53 | RTDECL(void *) RTMemExecAlloc(size_t cb) RT_NO_THROW
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| 54 | {
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| 55 | /*
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| 56 | * Allocate first.
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| 57 | */
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| 58 | AssertMsg(cb, ("Allocating ZERO bytes is really not a good idea! Good luck with the next assertion!\n"));
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| 59 | cb = RT_ALIGN_Z(cb, PAGE_SIZE);
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| 60 | void *pv = RTMemPageAlloc(cb);
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| 61 | if (pv)
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| 62 | {
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| 63 | /*
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| 64 | * Add PROT_EXEC flag to the page(s).
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| 65 | */
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| 66 | memset(pv, 0xcc, cb);
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| 67 | int rc = mprotect(pv, cb, PROT_READ | PROT_WRITE | PROT_EXEC);
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| 68 | if (rc)
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| 69 | {
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| 70 | AssertMsgFailed(("mprotect(%p, %#x,,) -> rc=%d, errno=%d\n", pv, cb, rc, errno));
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| 71 | free(pv);
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| 72 | pv = NULL;
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| 73 | }
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| 74 | }
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| 75 | return pv;
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| 76 | }
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| 77 |
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| 78 |
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| 79 | /**
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| 80 | * Free executable/read/write memory allocated by RTMemExecAlloc().
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| 81 | *
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| 82 | * @param pv Pointer to memory block.
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| 83 | */
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| 84 | RTDECL(void) RTMemExecFree(void *pv) RT_NO_THROW
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| 85 | {
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| 86 | return RTMemPageFree(pv);
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| 87 | }
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| 88 |
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| 89 |
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| 90 | /**
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| 91 | * Allocate page aligned memory.
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| 92 | *
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| 93 | * @returns Pointer to the allocated memory.
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| 94 | * @returns NULL if we're out of memory.
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| 95 | * @param cb Size of the memory block. Will be rounded up to page size.
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| 96 | */
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| 97 | RTDECL(void *) RTMemPageAlloc(size_t cb) RT_NO_THROW
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| 98 | {
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| 99 | cb = RT_ALIGN_Z(cb, PAGE_SIZE);
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| 100 | void *pv = malloc(cb);
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| 101 | AssertReleaseMsgReturn(RT_ALIGN_P(pv, PAGE_SIZE) == pv,
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| 102 | ("malloc(%zu) -> %p; expected page aligned!\n", cb, pv),
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| 103 | NULL);
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| 104 | return pv;
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| 105 | }
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| 106 |
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| 107 |
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| 108 | /**
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| 109 | * Allocate zero'ed page aligned memory.
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| 110 | *
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| 111 | * @returns Pointer to the allocated memory.
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| 112 | * @returns NULL if we're out of memory.
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| 113 | * @param cb Size of the memory block. Will be rounded up to page size.
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| 114 | */
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| 115 | RTDECL(void *) RTMemPageAllocZ(size_t cb) RT_NO_THROW
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| 116 | {
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| 117 | cb = RT_ALIGN_Z(cb, PAGE_SIZE);
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| 118 | void *pv = RTMemPageAlloc(cb);
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| 119 | if (pv)
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| 120 | bzero(pv, RT_ALIGN_Z(cb, PAGE_SIZE));
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| 121 | return pv;
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| 122 | }
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| 123 |
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| 124 |
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| 125 | /**
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| 126 | * Free a memory block allocated with RTMemPageAlloc() or RTMemPageAllocZ().
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| 127 | *
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| 128 | * @param pv Pointer to the block as it was returned by the allocation function.
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| 129 | * NULL will be ignored.
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| 130 | */
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| 131 | RTDECL(void) RTMemPageFree(void *pv) RT_NO_THROW
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| 132 | {
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| 133 | if (pv)
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| 134 | free(pv);
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| 135 | }
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| 136 |
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| 137 |
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| 138 | /**
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| 139 | * Change the page level protection of a memory region.
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| 140 | *
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| 141 | * @returns iprt status code.
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| 142 | * @param pv Start of the region. Will be rounded down to nearest page boundary.
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| 143 | * @param cb Size of the region. Will be rounded up to the nearest page boundary.
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| 144 | * @param fProtect The new protection, a combination of the RTMEM_PROT_* defines.
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| 145 | */
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| 146 | RTDECL(int) RTMemProtect(void *pv, size_t cb, unsigned fProtect) RT_NO_THROW
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| 147 | {
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| 148 | /*
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| 149 | * Validate input.
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| 150 | */
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| 151 | if (cb == 0)
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| 152 | {
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| 153 | AssertMsgFailed(("!cb\n"));
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| 154 | return VERR_INVALID_PARAMETER;
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| 155 | }
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| 156 | if (fProtect & ~(RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC))
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| 157 | {
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| 158 | AssertMsgFailed(("fProtect=%#x\n", fProtect));
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| 159 | return VERR_INVALID_PARAMETER;
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| 160 | }
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| 161 |
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| 162 | /*
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| 163 | * Convert the flags.
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| 164 | */
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| 165 | int fProt;
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| 166 | #if RTMEM_PROT_NONE == PROT_NONE \
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| 167 | && RTMEM_PROT_READ == PROT_READ \
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| 168 | && RTMEM_PROT_WRITE == PROT_WRITE \
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| 169 | && RTMEM_PROT_EXEC == PROT_EXEC
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| 170 | fProt = fProtect;
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| 171 | #else
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| 172 | Assert(!RTMEM_PROT_NONE);
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| 173 | if (!fProtect)
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| 174 | fProt = PROT_NONE;
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| 175 | else
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| 176 | {
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| 177 | fProt = 0;
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| 178 | if (fProtect & RTMEM_PROT_READ)
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| 179 | fProt |= PROT_READ;
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| 180 | if (fProtect & RTMEM_PROT_WRITE)
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| 181 | fProt |= PROT_WRITE;
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| 182 | if (fProtect & RTMEM_PROT_EXEC)
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| 183 | fProt |= PROT_EXEC;
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| 184 | }
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| 185 | #endif
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| 186 |
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| 187 | /*
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| 188 | * Align the request.
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| 189 | */
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| 190 | cb += (uintptr_t)pv & PAGE_OFFSET_MASK;
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| 191 | pv = (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK);
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| 192 |
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| 193 | /*
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| 194 | * Change the page attributes.
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| 195 | */
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| 196 | int rc = mprotect(pv, cb, fProt);
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| 197 | if (!rc)
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| 198 | return rc;
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| 199 | return RTErrConvertFromErrno(errno);
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| 200 | }
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