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Diffstat (limited to 'src/VBox/Runtime/r3/posix/rtmempage-exec-mmap-posix.cpp')
| -rw-r--r-- | src/VBox/Runtime/r3/posix/rtmempage-exec-mmap-posix.cpp | 187 |
1 files changed, 187 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r3/posix/rtmempage-exec-mmap-posix.cpp b/src/VBox/Runtime/r3/posix/rtmempage-exec-mmap-posix.cpp new file mode 100644 index 00000000..4dd7e989 --- /dev/null +++ b/src/VBox/Runtime/r3/posix/rtmempage-exec-mmap-posix.cpp @@ -0,0 +1,187 @@ +/* $Id: rtmempage-exec-mmap-posix.cpp $ */ +/** @file + * IPRT - RTMemPage*, POSIX with mmap only. + */ + +/* + * Copyright (C) 2006-2020 Oracle Corporation + * + * This file is part of VirtualBox Open Source Edition (OSE), as + * available from http://www.virtualbox.org. This file is free software; + * you can redistribute it and/or modify it under the terms of the GNU + * 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. + */ + + +/********************************************************************************************************************************* +* 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); +} + + + + + +RTDECL(void *) RTMemExecAllocTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF +{ + return rtMemPagePosixAlloc(cb, pszTag, 0, PROT_EXEC); +} + + +RTDECL(void) RTMemExecFree(void *pv, size_t cb) RT_NO_THROW_DEF +{ + return rtMemPagePosixFree(pv, cb); +} + |