alloc-posix.cpp revision c307f0d7384bfc4d19d2290a28be89868f02f42a
/* $Id$ */
/** @file
* IPRT - Memory Allocation, POSIX.
*/
/*
* Copyright (C) 2006-2007 Sun Microsystems, Inc.
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE 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.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 USA or visit http://www.sun.com if you need
* additional information or have any questions.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include <stdlib.h>
#include <malloc.h>
#include <errno.h>
/*******************************************************************************
* Defined Constants And Macros *
*******************************************************************************/
#if !defined(RT_USE_MMAP_EXEC) && (defined(RT_OS_LINUX))
# define RT_USE_MMAP_EXEC
#endif
#if !defined(RT_USE_MMAP_PAGE) && 0 /** @todo mmap is too slow for full scale EF setup. */
# define RT_USE_MMAP_PAGE
#endif
/*******************************************************************************
* Structures and Typedefs *
*******************************************************************************/
#ifdef RT_USE_MMAP_EXEC
/**
* RTMemExecAlloc() header used when using mmap for allocating the memory.
*/
typedef struct RTMEMEXECHDR
{
/** Magic number (RTMEMEXECHDR_MAGIC). */
/** The size we requested from mmap. */
# if ARCH_BITS == 32
# endif
/** Magic for RTMEMEXECHDR. */
#endif /* RT_USE_MMAP_EXEC */
/**
* Allocates memory which may contain code.
*
* @returns Pointer to the allocated memory.
* @returns NULL on failure.
* @param cb Size in bytes of the memory block to allocate.
*/
{
AssertMsg(cb, ("Allocating ZERO bytes is really not a good idea! Good luck with the next assertion!\n"));
#ifdef RT_USE_MMAP_EXEC
/*
* Use mmap to get low memory.
*/
# if defined(RT_ARCH_AMD64) && defined(MAP_32BIT)
# endif
, -1, 0);
#else
/*
* Allocate first.
*/
{
/*
* Add PROT_EXEC flag to the page.
*
* This is in violation of the SuS where I think it saith that mprotect() shall
* only be used with mmap()'ed memory. Works on linux and OS/2 LIBC v0.6.
*/
if (rc)
{
}
}
#endif
return pv;
}
/**
* Free executable/read/write memory allocated by RTMemExecAlloc().
*
* @param pv Pointer to memory block.
*/
{
if (pv)
{
#ifdef RT_USE_MMAP_EXEC
AssertMsgReturnVoid(pHdr->uMagic == RTMEMEXECHDR_MAGIC, ("pHdr=%p(uMagic=%#zx) pv=%p\n", pHdr, pHdr->uMagic, pv));
#else
#endif
}
}
/**
* Allocate page aligned memory.
*
* @returns Pointer to the allocated memory.
* @returns NULL if we're out of memory.
* @param cb Size of the memory block. Will be rounded up to page size.
*/
{
#ifdef RT_USE_MMAP_PAGE
return pv;
#else
# if 0 /** @todo huh? we're using posix_memalign in the next function... */
void *pv;
if (!rc)
return pv;
return NULL;
# else
# endif
#endif
}
/**
* Allocate zero'ed page aligned memory.
*
* @returns Pointer to the allocated memory.
* @returns NULL if we're out of memory.
* @param cb Size of the memory block. Will be rounded up to page size.
*/
{
#ifdef RT_USE_MMAP_PAGE
return pv;
#else
void *pv;
if (!rc)
{
return pv;
}
return NULL;
#endif
}
/**
* Free a memory block allocated with RTMemPageAlloc() or RTMemPageAllocZ().
*
* @param pv Pointer to the block as it was returned by the allocation function.
* NULL will be ignored.
*/
{
if (pv)
{
#ifdef RT_USE_MMAP_PAGE
#else
#endif
}
}
/**
* Change the page level protection of a memory region.
*
* @returns iprt status code.
* @param pv Start of the region. Will be rounded down to nearest page boundary.
* @param cb Size of the region. Will be rounded up to the nearest page boundary.
* @param fProtect The new protection, a combination of the RTMEM_PROT_* defines.
*/
{
/*
* Validate input.
*/
if (cb == 0)
{
AssertMsgFailed(("!cb\n"));
return VERR_INVALID_PARAMETER;
}
{
return VERR_INVALID_PARAMETER;
}
/*
* Convert the flags.
*/
int fProt;
#if RTMEM_PROT_NONE == PROT_NONE \
&& RTMEM_PROT_READ == PROT_READ \
&& RTMEM_PROT_WRITE == PROT_WRITE \
&& RTMEM_PROT_EXEC == PROT_EXEC
#else
if (!fProtect)
else
{
fProt = 0;
if (fProtect & RTMEM_PROT_READ)
if (fProtect & RTMEM_PROT_WRITE)
fProt |= PROT_WRITE;
if (fProtect & RTMEM_PROT_EXEC)
}
#endif
/*
* Align the request.
*/
/*
* Change the page attributes.
*/
if (!rc)
return rc;
return RTErrConvertFromErrno(errno);
}