alloc-posix.cpp revision a4d7fc6f54717c342281099fe14f5666be9b7921
/* $Id$ */
/** @file
* innotek Portable Runtime - Memory Allocation, POSIX.
*/
/*
* Copyright (C) 2006-2007 innotek GmbH
*
* 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 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.
*
* If you received this file as part of a commercial VirtualBox
* distribution, then only the terms of your commercial VirtualBox
* license agreement apply instead of the previous paragraph.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include <stdlib.h>
#include <malloc.h>
#include <errno.h>
#if !defined(RT_USE_MMAP) && (defined(RT_OS_LINUX))
# define RT_USE_MMAP
#endif
/*******************************************************************************
* Structures and Typedefs *
*******************************************************************************/
#ifdef RT_USE_MMAP
/**
* 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 */
#ifdef IN_RING3
/**
* 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
/*
* 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
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.
*/
{
#if 0 /** @todo huh? we're using posix_memalign in the next function... */
void *pv;
if (!rc)
return pv;
return NULL;
#else
#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.
*/
{
void *pv;
if (!rc)
{
return pv;
}
return NULL;
}
/**
* 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)
}
/**
* 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);
}
#endif