diff options
Diffstat (limited to 'src/VBox/Runtime/r3/posix/allocex-r3-posix.cpp')
-rw-r--r-- | src/VBox/Runtime/r3/posix/allocex-r3-posix.cpp | 120 |
1 files changed, 120 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r3/posix/allocex-r3-posix.cpp b/src/VBox/Runtime/r3/posix/allocex-r3-posix.cpp new file mode 100644 index 00000000..b8f1a1ad --- /dev/null +++ b/src/VBox/Runtime/r3/posix/allocex-r3-posix.cpp @@ -0,0 +1,120 @@ +/* $Id: allocex-r3-posix.cpp $ */ +/** @file + * IPRT - Memory Allocation, Extended Alloc Workers, posix. + */ + +/* + * Copyright (C) 2006-2023 Oracle and/or its affiliates. + * + * This file is part of VirtualBox base platform packages, as + * available from https://www.virtualbox.org. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation, in version 3 of the + * License. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, see <https://www.gnu.org/licenses>. + * + * The contents of this file may alternatively be used under the terms + * of the Common Development and Distribution License Version 1.0 + * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included + * in the VirtualBox distribution, in which case the provisions of the + * CDDL are applicable instead of those of the GPL. + * + * You may elect to license modified versions of this file under the + * terms and conditions of either the GPL or the CDDL or both. + * + * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0 + */ + + +/********************************************************************************************************************************* +* Header Files * +*********************************************************************************************************************************/ +#define RTMEM_NO_WRAP_TO_EF_APIS +#include <iprt/mem.h> +#include "internal/iprt.h" + +#include <iprt/assert.h> +#include <iprt/errcore.h> +#include <iprt/string.h> +#include "../allocex.h" + +#include <sys/mman.h> + + +DECLHIDDEN(int) rtMemAllocEx16BitReach(size_t cbAlloc, uint32_t fFlags, void **ppv) +{ + AssertReturn(cbAlloc < _64K, VERR_NO_MEMORY); + + /* + * Try with every possible address hint since the possible range is very limited. + */ + int fProt = PROT_READ | PROT_WRITE | (fFlags & RTMEMALLOCEX_FLAGS_EXEC ? PROT_EXEC : 0); + uintptr_t uAddr = 0x1000; + uintptr_t uAddrLast = _64K - uAddr - cbAlloc; + while (uAddr <= uAddrLast) + { + void *pv = mmap((void *)uAddr, cbAlloc, fProt, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + if (pv && (uintptr_t)pv <= uAddrLast) + { + *ppv = pv; + return VINF_SUCCESS; + } + + if (pv) + { + munmap(pv, cbAlloc); + pv = NULL; + } + uAddr += _4K; + } + + return VERR_NO_MEMORY; +} + + +DECLHIDDEN(int) rtMemAllocEx32BitReach(size_t cbAlloc, uint32_t fFlags, void **ppv) +{ + int fProt = PROT_READ | PROT_WRITE | (fFlags & RTMEMALLOCEX_FLAGS_EXEC ? PROT_EXEC : 0); +#if ARCH_BITS == 32 + void *pv = mmap(NULL, cbAlloc, fProt, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + if (pv) + { + *ppv = pv; + return VINF_SUCCESS; + } + return VERR_NO_MEMORY; + +#elif defined(RT_OS_LINUX) +# ifdef MAP_32BIT + void *pv = mmap(NULL, cbAlloc, fProt, MAP_PRIVATE | MAP_ANONYMOUS | MAP_32BIT, -1, 0); + if (pv) + { + *ppv = pv; + return VINF_SUCCESS; + } +# endif + + /** @todo On linux, we need an accurate hint. Since I don't need this branch of + * the code right now, I won't bother starting to parse + * /proc/curproc/mmap right now... */ +#else +#endif + return VERR_NOT_SUPPORTED; +} + + +DECLHIDDEN(void) rtMemFreeExYyBitReach(void *pv, size_t cb, uint32_t fFlags) +{ + RT_NOREF_PV(fFlags); + munmap(pv, cb); +} + |