diff options
Diffstat (limited to 'src/VBox/Runtime/r3/win/alloc-win.cpp')
| -rw-r--r-- | src/VBox/Runtime/r3/win/alloc-win.cpp | 208 |
1 files changed, 208 insertions, 0 deletions
diff --git a/src/VBox/Runtime/r3/win/alloc-win.cpp b/src/VBox/Runtime/r3/win/alloc-win.cpp new file mode 100644 index 00000000..084e588e --- /dev/null +++ b/src/VBox/Runtime/r3/win/alloc-win.cpp @@ -0,0 +1,208 @@ +/* $Id: alloc-win.cpp $ */ +/** @file + * IPRT - Memory Allocation, Windows. + */ + +/* + * Copyright (C) 2006-2019 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 * +*********************************************************************************************************************************/ +/*#define USE_VIRTUAL_ALLOC*/ +#define LOG_GROUP RTLOGGROUP_MEM +#include <iprt/win/windows.h> + +#include <iprt/alloc.h> +#include <iprt/assert.h> +#include <iprt/param.h> +#include <iprt/string.h> +#include <iprt/errcore.h> + +#ifndef USE_VIRTUAL_ALLOC +# include <malloc.h> +#endif + + +RTDECL(void *) RTMemExecAllocTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF +{ + RT_NOREF_PV(pszTag); + + /* + * Allocate first. + */ + AssertMsg(cb, ("Allocating ZERO bytes is really not a good idea! Good luck with the next assertion!\n")); + cb = RT_ALIGN_Z(cb, 32); + void *pv = malloc(cb); + AssertMsg(pv, ("malloc(%d) failed!!!\n", cb)); + if (pv) + { + memset(pv, 0xcc, cb); + void *pvProt = (void *)((uintptr_t)pv & ~(uintptr_t)PAGE_OFFSET_MASK); + size_t cbProt = ((uintptr_t)pv & PAGE_OFFSET_MASK) + cb; + cbProt = RT_ALIGN_Z(cbProt, PAGE_SIZE); + DWORD fFlags = 0; + if (!VirtualProtect(pvProt, cbProt, PAGE_EXECUTE_READWRITE, &fFlags)) + { + AssertMsgFailed(("VirtualProtect(%p, %#x,,) -> lasterr=%d\n", pvProt, cbProt, GetLastError())); + free(pv); + pv = NULL; + } + } + return pv; +} + + +RTDECL(void) RTMemExecFree(void *pv, size_t cb) RT_NO_THROW_DEF +{ + RT_NOREF_PV(cb); + + if (pv) + free(pv); +} + + +RTDECL(void *) RTMemPageAllocTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF +{ + RT_NOREF_PV(pszTag); + +#ifdef USE_VIRTUAL_ALLOC + void *pv = VirtualAlloc(NULL, RT_ALIGN_Z(cb, PAGE_SIZE), MEM_COMMIT, PAGE_READWRITE); +#else + void *pv = _aligned_malloc(RT_ALIGN_Z(cb, PAGE_SIZE), PAGE_SIZE); +#endif + AssertMsg(pv, ("cb=%d lasterr=%d\n", cb, GetLastError())); + return pv; +} + + +RTDECL(void *) RTMemPageAllocZTag(size_t cb, const char *pszTag) RT_NO_THROW_DEF +{ + RT_NOREF_PV(pszTag); + +#ifdef USE_VIRTUAL_ALLOC + void *pv = VirtualAlloc(NULL, RT_ALIGN_Z(cb, PAGE_SIZE), MEM_COMMIT, PAGE_READWRITE); +#else + void *pv = _aligned_malloc(RT_ALIGN_Z(cb, PAGE_SIZE), PAGE_SIZE); +#endif + if (pv) + { + memset(pv, 0, RT_ALIGN_Z(cb, PAGE_SIZE)); + return pv; + } + AssertMsgFailed(("cb=%d lasterr=%d\n", cb, GetLastError())); + return NULL; +} + + +RTDECL(void) RTMemPageFree(void *pv, size_t cb) RT_NO_THROW_DEF +{ + RT_NOREF_PV(cb); + + if (pv) + { +#ifdef USE_VIRTUAL_ALLOC + if (!VirtualFree(pv, 0, MEM_RELEASE)) + AssertMsgFailed(("pv=%p lasterr=%d\n", pv, GetLastError())); +#else + _aligned_free(pv); +#endif + } +} + + +RTDECL(int) RTMemProtect(void *pv, size_t cb, unsigned fProtect) RT_NO_THROW_DEF +{ + /* + * Validate input. + */ + if (cb == 0) + { + AssertMsgFailed(("!cb\n")); + return VERR_INVALID_PARAMETER; + } + if (fProtect & ~(RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC)) + { + AssertMsgFailed(("fProtect=%#x\n", fProtect)); + return VERR_INVALID_PARAMETER; + } + + /* + * Convert the flags. + */ + int fProt; + Assert(!RTMEM_PROT_NONE); + switch (fProtect & (RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC)) + { + case RTMEM_PROT_NONE: + fProt = PAGE_NOACCESS; + break; + + case RTMEM_PROT_READ: + fProt = PAGE_READONLY; + break; + + case RTMEM_PROT_READ | RTMEM_PROT_WRITE: + fProt = PAGE_READWRITE; + break; + + case RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC: + fProt = PAGE_EXECUTE_READWRITE; + break; + + case RTMEM_PROT_READ | RTMEM_PROT_EXEC: + fProt = PAGE_EXECUTE_READWRITE; + break; + + case RTMEM_PROT_WRITE: + fProt = PAGE_READWRITE; + break; + + case RTMEM_PROT_WRITE | RTMEM_PROT_EXEC: + fProt = PAGE_EXECUTE_READWRITE; + break; + + case RTMEM_PROT_EXEC: + fProt = PAGE_EXECUTE_READWRITE; + break; + + /* If the compiler had any brains it would warn about this case. */ + default: + AssertMsgFailed(("fProtect=%#x\n", fProtect)); + return VERR_INTERNAL_ERROR; + } + + /* + * Align the request. + */ + cb += (uintptr_t)pv & PAGE_OFFSET_MASK; + pv = (void *)((uintptr_t)pv & ~(uintptr_t)PAGE_OFFSET_MASK); + + /* + * Change the page attributes. + */ + DWORD fFlags = 0; + if (VirtualProtect(pv, cb, fProt, &fFlags)) + return VINF_SUCCESS; + return RTErrConvertFromWin32(GetLastError()); +} + |