| 1 | /* $Id: alloc-win.cpp 5428 2007-10-21 21:27:47Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * innotek Portable Runtime - Memory Allocation, Win32.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2006-2007 innotek GmbH
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License as published by the Free Software Foundation,
|
|---|
| 13 | * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
|
|---|
| 14 | * distribution. VirtualBox OSE is distributed in the hope that it will
|
|---|
| 15 | * be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | */
|
|---|
| 17 |
|
|---|
| 18 |
|
|---|
| 19 | /*******************************************************************************
|
|---|
| 20 | * Header Files *
|
|---|
| 21 | *******************************************************************************/
|
|---|
| 22 | #define LOG_GROUP RTLOGGROUP_MEM
|
|---|
| 23 | #include <Windows.h>
|
|---|
| 24 |
|
|---|
| 25 | #include <iprt/alloc.h>
|
|---|
| 26 | #include <iprt/assert.h>
|
|---|
| 27 | #include <iprt/param.h>
|
|---|
| 28 | #include <iprt/string.h>
|
|---|
| 29 | #include <iprt/err.h>
|
|---|
| 30 |
|
|---|
| 31 | #ifndef USE_VIRTUAL_ALLOC
|
|---|
| 32 | # include <malloc.h>
|
|---|
| 33 | #endif
|
|---|
| 34 |
|
|---|
| 35 |
|
|---|
| 36 | /**
|
|---|
| 37 | * Allocates memory which may contain code.
|
|---|
| 38 | *
|
|---|
| 39 | * @returns Pointer to the allocated memory.
|
|---|
| 40 | * @returns NULL on failure.
|
|---|
| 41 | * @param cb Size in bytes of the memory block to allocate.
|
|---|
| 42 | */
|
|---|
| 43 | RTDECL(void *) RTMemExecAlloc(size_t cb)
|
|---|
| 44 | {
|
|---|
| 45 | /*
|
|---|
| 46 | * Allocate first.
|
|---|
| 47 | */
|
|---|
| 48 | AssertMsg(cb, ("Allocating ZERO bytes is really not a good idea! Good luck with the next assertion!\n"));
|
|---|
| 49 | cb = RT_ALIGN_Z(cb, 32);
|
|---|
| 50 | void *pv = malloc(cb);
|
|---|
| 51 | AssertMsg(pv, ("malloc(%d) failed!!!\n", cb));
|
|---|
| 52 | if (pv)
|
|---|
| 53 | {
|
|---|
| 54 | /*
|
|---|
| 55 | * Add PROT_EXEC flag to the page.
|
|---|
| 56 | *
|
|---|
| 57 | * This is in violation of the SuS where I think it saith that mprotect() shall
|
|---|
| 58 | * only be used with mmap()'ed memory. Works on linux and OS/2 LIBC v0.6.
|
|---|
| 59 | */
|
|---|
| 60 | memset(pv, 0xcc, cb);
|
|---|
| 61 | void *pvProt = (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK);
|
|---|
| 62 | size_t cbProt = ((uintptr_t)pv & PAGE_OFFSET_MASK) + cb;
|
|---|
| 63 | cbProt = RT_ALIGN_Z(cbProt, PAGE_SIZE);
|
|---|
| 64 | DWORD fFlags = 0;
|
|---|
| 65 | if (!VirtualProtect(pvProt, cbProt, PAGE_EXECUTE_READWRITE, &fFlags))
|
|---|
| 66 | {
|
|---|
| 67 | AssertMsgFailed(("VirtualProtect(%p, %#x,,) -> lasterr=%d\n", pvProt, cbProt, GetLastError()));
|
|---|
| 68 | free(pv);
|
|---|
| 69 | pv = NULL;
|
|---|
| 70 | }
|
|---|
| 71 | }
|
|---|
| 72 | return pv;
|
|---|
| 73 | }
|
|---|
| 74 |
|
|---|
| 75 |
|
|---|
| 76 | /**
|
|---|
| 77 | * Free executable/read/write memory allocated by RTMemExecAlloc().
|
|---|
| 78 | *
|
|---|
| 79 | * @param pv Pointer to memory block.
|
|---|
| 80 | */
|
|---|
| 81 | RTDECL(void) RTMemExecFree(void *pv)
|
|---|
| 82 | {
|
|---|
| 83 | if (pv)
|
|---|
| 84 | free(pv);
|
|---|
| 85 | }
|
|---|
| 86 |
|
|---|
| 87 |
|
|---|
| 88 | /**
|
|---|
| 89 | * Allocate page aligned memory.
|
|---|
| 90 | *
|
|---|
| 91 | * @returns Pointer to the allocated memory.
|
|---|
| 92 | * @returns NULL if we're out of memory.
|
|---|
| 93 | * @param cb Size of the memory block. Will be rounded up to page size.
|
|---|
| 94 | */
|
|---|
| 95 | RTDECL(void *) RTMemPageAlloc(size_t cb)
|
|---|
| 96 | {
|
|---|
| 97 | #ifdef USE_VIRTUAL_ALLOC
|
|---|
| 98 | void *pv = VirtualAlloc(NULL, RT_ALIGN_Z(cb, PAGE_SIZE), MEM_COMMIT, PAGE_READWRITE);
|
|---|
| 99 | #else
|
|---|
| 100 | void *pv = _aligned_malloc(cb, PAGE_SIZE);
|
|---|
| 101 | #endif
|
|---|
| 102 | AssertMsg(pv, ("cb=%d lasterr=%d\n", cb, GetLastError()));
|
|---|
| 103 | return pv;
|
|---|
| 104 | }
|
|---|
| 105 |
|
|---|
| 106 |
|
|---|
| 107 | /**
|
|---|
| 108 | * Allocate zero'ed page aligned memory.
|
|---|
| 109 | *
|
|---|
| 110 | * @returns Pointer to the allocated memory.
|
|---|
| 111 | * @returns NULL if we're out of memory.
|
|---|
| 112 | * @param cb Size of the memory block. Will be rounded up to page size.
|
|---|
| 113 | */
|
|---|
| 114 | RTDECL(void *) RTMemPageAllocZ(size_t cb)
|
|---|
| 115 | {
|
|---|
| 116 | #ifdef USE_VIRTUAL_ALLOC
|
|---|
| 117 | void *pv = VirtualAlloc(NULL, RT_ALIGN_Z(cb, PAGE_SIZE), MEM_COMMIT, PAGE_READWRITE);
|
|---|
| 118 | #else
|
|---|
| 119 | void *pv = _aligned_malloc(cb, PAGE_SIZE);
|
|---|
| 120 | #endif
|
|---|
| 121 | if (pv)
|
|---|
| 122 | {
|
|---|
| 123 | memset(pv, 0, RT_ALIGN_Z(cb, PAGE_SIZE));
|
|---|
| 124 | return pv;
|
|---|
| 125 | }
|
|---|
| 126 | AssertMsgFailed(("cb=%d lasterr=%d\n", cb, GetLastError()));
|
|---|
| 127 | return NULL;
|
|---|
| 128 | }
|
|---|
| 129 |
|
|---|
| 130 |
|
|---|
| 131 | /**
|
|---|
| 132 | * Free a memory block allocated with RTMemPageAlloc() or RTMemPageAllocZ().
|
|---|
| 133 | *
|
|---|
| 134 | * @param pv Pointer to the block as it was returned by the allocation function.
|
|---|
| 135 | * NULL will be ignored.
|
|---|
| 136 | */
|
|---|
| 137 | RTDECL(void) RTMemPageFree(void *pv)
|
|---|
| 138 | {
|
|---|
| 139 | if (pv)
|
|---|
| 140 | {
|
|---|
| 141 | #ifdef USE_VIRTUAL_ALLOC
|
|---|
| 142 | if (!VirtualFree(pv, 0, MEM_RELEASE))
|
|---|
| 143 | AssertMsgFailed(("pv=%p lasterr=%d\n", pv, GetLastError()));
|
|---|
| 144 | #else
|
|---|
| 145 | _aligned_free(pv);
|
|---|
| 146 | #endif
|
|---|
| 147 | }
|
|---|
| 148 | }
|
|---|
| 149 |
|
|---|
| 150 |
|
|---|
| 151 | /**
|
|---|
| 152 | * Change the page level protection of a memory region.
|
|---|
| 153 | *
|
|---|
| 154 | * @returns iprt status code.
|
|---|
| 155 | * @param pv Start of the region. Will be rounded down to nearest page boundary.
|
|---|
| 156 | * @param cb Size of the region. Will be rounded up to the nearest page boundary.
|
|---|
| 157 | * @param fProtect The new protection, a combination of the RTMEM_PROT_* defines.
|
|---|
| 158 | */
|
|---|
| 159 | RTDECL(int) RTMemProtect(void *pv, size_t cb, unsigned fProtect)
|
|---|
| 160 | {
|
|---|
| 161 | /*
|
|---|
| 162 | * Validate input.
|
|---|
| 163 | */
|
|---|
| 164 | if (cb == 0)
|
|---|
| 165 | {
|
|---|
| 166 | AssertMsgFailed(("!cb\n"));
|
|---|
| 167 | return VERR_INVALID_PARAMETER;
|
|---|
| 168 | }
|
|---|
| 169 | if (fProtect & ~(RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC))
|
|---|
| 170 | {
|
|---|
| 171 | AssertMsgFailed(("fProtect=%#x\n", fProtect));
|
|---|
| 172 | return VERR_INVALID_PARAMETER;
|
|---|
| 173 | }
|
|---|
| 174 |
|
|---|
| 175 | /*
|
|---|
| 176 | * Convert the flags.
|
|---|
| 177 | */
|
|---|
| 178 | int fProt;
|
|---|
| 179 | Assert(!RTMEM_PROT_NONE);
|
|---|
| 180 | switch (fProtect & (RTMEM_PROT_NONE | RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC))
|
|---|
| 181 | {
|
|---|
| 182 | case RTMEM_PROT_NONE:
|
|---|
| 183 | fProt = PAGE_NOACCESS;
|
|---|
| 184 | break;
|
|---|
| 185 |
|
|---|
| 186 | case RTMEM_PROT_READ:
|
|---|
| 187 | fProt = PAGE_READONLY;
|
|---|
| 188 | break;
|
|---|
| 189 |
|
|---|
| 190 | case RTMEM_PROT_READ | RTMEM_PROT_WRITE:
|
|---|
| 191 | fProt = PAGE_READWRITE;
|
|---|
| 192 | break;
|
|---|
| 193 |
|
|---|
| 194 | case RTMEM_PROT_READ | RTMEM_PROT_WRITE | RTMEM_PROT_EXEC:
|
|---|
| 195 | fProt = PAGE_EXECUTE_READWRITE;
|
|---|
| 196 | break;
|
|---|
| 197 |
|
|---|
| 198 | case RTMEM_PROT_READ | RTMEM_PROT_EXEC:
|
|---|
| 199 | fProt = PAGE_EXECUTE_READWRITE;
|
|---|
| 200 | break;
|
|---|
| 201 |
|
|---|
| 202 | case RTMEM_PROT_WRITE:
|
|---|
| 203 | fProt = PAGE_READWRITE;
|
|---|
| 204 | break;
|
|---|
| 205 |
|
|---|
| 206 | case RTMEM_PROT_WRITE | RTMEM_PROT_EXEC:
|
|---|
| 207 | fProt = PAGE_EXECUTE_READWRITE;
|
|---|
| 208 | break;
|
|---|
| 209 |
|
|---|
| 210 | case RTMEM_PROT_EXEC:
|
|---|
| 211 | fProt = PAGE_EXECUTE_READWRITE;
|
|---|
| 212 | break;
|
|---|
| 213 |
|
|---|
| 214 | /* If the compiler had any brains it would warn about this case. */
|
|---|
| 215 | default:
|
|---|
| 216 | AssertMsgFailed(("fProtect=%#x\n", fProtect));
|
|---|
| 217 | return VERR_INTERNAL_ERROR;
|
|---|
| 218 | }
|
|---|
| 219 |
|
|---|
| 220 | /*
|
|---|
| 221 | * Align the request.
|
|---|
| 222 | */
|
|---|
| 223 | cb += (uintptr_t)pv & PAGE_OFFSET_MASK;
|
|---|
| 224 | pv = (void *)((uintptr_t)pv & ~PAGE_OFFSET_MASK);
|
|---|
| 225 |
|
|---|
| 226 | /*
|
|---|
| 227 | * Change the page attributes.
|
|---|
| 228 | */
|
|---|
| 229 | DWORD fFlags = 0;
|
|---|
| 230 | if (VirtualProtect(pv, cb, fProt, &fFlags))
|
|---|
| 231 | return VINF_SUCCESS;
|
|---|
| 232 | return RTErrConvertFromWin32(GetLastError());
|
|---|
| 233 | }
|
|---|
| 234 |
|
|---|
