| 1 | /* $Id: allocex-r3-posix.cpp 69111 2017-10-17 14:26:02Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * IPRT - Memory Allocation, Extended Alloc Workers, posix.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2006-2017 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 | #include <iprt/assert.h>
|
|---|
| 36 | #include <iprt/err.h>
|
|---|
| 37 | #include <iprt/string.h>
|
|---|
| 38 | #include "../allocex.h"
|
|---|
| 39 |
|
|---|
| 40 | #include <sys/mman.h>
|
|---|
| 41 |
|
|---|
| 42 |
|
|---|
| 43 | DECLHIDDEN(int) rtMemAllocEx16BitReach(size_t cbAlloc, uint32_t fFlags, void **ppv)
|
|---|
| 44 | {
|
|---|
| 45 | AssertReturn(cbAlloc < _64K, VERR_NO_MEMORY);
|
|---|
| 46 |
|
|---|
| 47 | /*
|
|---|
| 48 | * Try with every possible address hint since the possible range is very limited.
|
|---|
| 49 | */
|
|---|
| 50 | int fProt = PROT_READ | PROT_WRITE | (fFlags & RTMEMALLOCEX_FLAGS_EXEC ? PROT_EXEC : 0);
|
|---|
| 51 | uintptr_t uAddr = 0x1000;
|
|---|
| 52 | uintptr_t uAddrLast = _64K - uAddr - cbAlloc;
|
|---|
| 53 | while (uAddr <= uAddrLast)
|
|---|
| 54 | {
|
|---|
| 55 | void *pv = mmap((void *)uAddr, cbAlloc, fProt, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
|
|---|
| 56 | if (pv && (uintptr_t)pv <= uAddrLast)
|
|---|
| 57 | {
|
|---|
| 58 | *ppv = pv;
|
|---|
| 59 | return VINF_SUCCESS;
|
|---|
| 60 | }
|
|---|
| 61 |
|
|---|
| 62 | if (pv)
|
|---|
| 63 | {
|
|---|
| 64 | munmap(pv, cbAlloc);
|
|---|
| 65 | pv = NULL;
|
|---|
| 66 | }
|
|---|
| 67 | uAddr += _4K;
|
|---|
| 68 | }
|
|---|
| 69 |
|
|---|
| 70 | return VERR_NO_MEMORY;
|
|---|
| 71 | }
|
|---|
| 72 |
|
|---|
| 73 |
|
|---|
| 74 | DECLHIDDEN(int) rtMemAllocEx32BitReach(size_t cbAlloc, uint32_t fFlags, void **ppv)
|
|---|
| 75 | {
|
|---|
| 76 | int fProt = PROT_READ | PROT_WRITE | (fFlags & RTMEMALLOCEX_FLAGS_EXEC ? PROT_EXEC : 0);
|
|---|
| 77 | #if ARCH_BITS == 32
|
|---|
| 78 | void *pv = mmap(NULL, cbAlloc, fProt, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
|
|---|
| 79 | if (pv)
|
|---|
| 80 | {
|
|---|
| 81 | *ppv = pv;
|
|---|
| 82 | return VINF_SUCCESS;
|
|---|
| 83 | }
|
|---|
| 84 | return VERR_NO_MEMORY;
|
|---|
| 85 |
|
|---|
| 86 | #elif defined(RT_OS_LINUX)
|
|---|
| 87 | # ifdef MAP_32BIT
|
|---|
| 88 | void *pv = mmap(NULL, cbAlloc, fProt, MAP_PRIVATE | MAP_ANONYMOUS | MAP_32BIT, -1, 0);
|
|---|
| 89 | if (pv)
|
|---|
| 90 | {
|
|---|
| 91 | *ppv = pv;
|
|---|
| 92 | return VINF_SUCCESS;
|
|---|
| 93 | }
|
|---|
| 94 | # endif
|
|---|
| 95 |
|
|---|
| 96 | /** @todo On linux, we need an accurate hint. Since I don't need this branch of
|
|---|
| 97 | * the code right now, I won't bother starting to parse
|
|---|
| 98 | * /proc/curproc/mmap right now... */
|
|---|
| 99 | #else
|
|---|
| 100 | #endif
|
|---|
| 101 | return VERR_NOT_SUPPORTED;
|
|---|
| 102 | }
|
|---|
| 103 |
|
|---|
| 104 |
|
|---|
| 105 | DECLHIDDEN(void) rtMemFreeExYyBitReach(void *pv, size_t cb, uint32_t fFlags)
|
|---|
| 106 | {
|
|---|
| 107 | RT_NOREF_PV(fFlags);
|
|---|
| 108 | munmap(pv, cb);
|
|---|
| 109 | }
|
|---|
| 110 |
|
|---|
