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/* $Id: rtmempage-exec-mmap-posix.cpp $ */
/** @file
* IPRT - RTMemPage*, POSIX with mmap only.
*/
/*
* 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 *
*********************************************************************************************************************************/
#include "internal/iprt.h"
#include <iprt/mem.h>
#include <iprt/asm.h>
#include <iprt/assert.h>
#include <iprt/errcore.h>
#include <iprt/param.h>
#include <iprt/string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/mman.h>
#if !defined(MAP_ANONYMOUS) && defined(MAP_ANON)
# define MAP_ANONYMOUS MAP_ANON
#endif
/**
* Applies flags to an allocation.
*
* @param pv The allocation.
* @param cb The size of the allocation (page aligned).
* @param fFlags RTMEMPAGEALLOC_F_XXX.
*/
DECLINLINE(void) rtMemPagePosixApplyFlags(void *pv, size_t cb, uint32_t fFlags)
{
#ifndef RT_OS_OS2
if (fFlags & RTMEMPAGEALLOC_F_ADVISE_LOCKED)
{
int rc = mlock(pv, cb);
# ifndef RT_OS_SOLARIS /* mlock(3C) on Solaris requires the priv_lock_memory privilege */
AssertMsg(rc == 0, ("mlock %p LB %#zx -> %d errno=%d\n", pv, cb, rc, errno));
# endif
NOREF(rc);
}
# ifdef MADV_DONTDUMP
if (fFlags & RTMEMPAGEALLOC_F_ADVISE_NO_DUMP)
{
int rc = madvise(pv, cb, MADV_DONTDUMP);
AssertMsg(rc == 0, ("madvice %p LB %#zx MADV_DONTDUMP -> %d errno=%d\n", pv, cb, rc, errno));
NOREF(rc);
}
# endif
#endif
if (fFlags & RTMEMPAGEALLOC_F_ZERO)
RT_BZERO(pv, cb);
}
/**
* Allocates memory from the specified heap.
*
* @returns Address of the allocated memory.
* @param cb The number of bytes to allocate.
* @param pszTag The tag.
* @param fFlags RTMEMPAGEALLOC_F_XXX.
* @param fProtExec PROT_EXEC or 0.
*/
static void *rtMemPagePosixAlloc(size_t cb, const char *pszTag, uint32_t fFlags, int fProtExec)
{
/*
* Validate & adjust the input.
*/
Assert(cb > 0);
NOREF(pszTag);
cb = RT_ALIGN_Z(cb, PAGE_SIZE);
/*
* Do the allocation.
*/
void *pv = mmap(NULL, cb,
PROT_READ | PROT_WRITE | fProtExec,
MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
if (pv != MAP_FAILED)
{
AssertPtr(pv);
if (fFlags)
rtMemPagePosixApplyFlags(pv, cb, fFlags);
}
else
pv = NULL;
return pv;
}
/**
* Free memory allocated by rtMemPagePosixAlloc.
*
* @param pv The address of the memory to free.
* @param cb The size.
*/
static void rtMemPagePosixFree(void *pv, size_t cb)
{
/*
* Validate & adjust the input.
*/
if (!pv)
return;
AssertPtr(pv);
Assert(cb > 0);
Assert(!((uintptr_t)pv & PAGE_OFFSET_MASK));
cb = RT_ALIGN_Z(cb, PAGE_SIZE);
/*
* Free the memory.
*/
int rc = munmap(pv, cb);
AssertMsg(rc == 0, ("rc=%d pv=%p cb=%#zx\n", rc, pv, cb)); NOREF(rc);
}
RTDECL(void *) RTMemPageAllocTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF
{
return rtMemPagePosixAlloc(cb, pszTag, 0, 0);
}
RTDECL(void *) RTMemPageAllocZTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF
{
return rtMemPagePosixAlloc(cb, pszTag, RTMEMPAGEALLOC_F_ZERO, 0);
}
RTDECL(void *) RTMemPageAllocExTag(size_t cb, uint32_t fFlags, const char *pszTag) RT_NO_THROW_DEF
{
AssertReturn(!(fFlags & ~RTMEMPAGEALLOC_F_VALID_MASK), NULL);
return rtMemPagePosixAlloc(cb, pszTag, fFlags, 0);
}
RTDECL(void) RTMemPageFree(void *pv, size_t cb) RT_NO_THROW_DEF
{
return rtMemPagePosixFree(pv, cb);
}
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