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/* $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);
}
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