| /* ********************************************************** |
| * Copyright (c) 2004 VMware, Inc. All rights reserved. |
| * **********************************************************/ |
| |
| /* |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * * Redistributions of source code must retain the above copyright notice, |
| * this list of conditions and the following disclaimer. |
| * |
| * * Redistributions in binary form must reproduce the above copyright notice, |
| * this list of conditions and the following disclaimer in the documentation |
| * and/or other materials provided with the distribution. |
| * |
| * * Neither the name of VMware, Inc. nor the names of its contributors may be |
| * used to endorse or promote products derived from this software without |
| * specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL VMWARE, INC. OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
| * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER |
| * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH |
| * DAMAGE. |
| */ |
| |
| #include <windows.h> |
| #include <stdio.h> |
| |
| int |
| main(int argc, char **argv) |
| { |
| int trip_count; |
| int syscall_count = 0; |
| int i; |
| int tid = GetCurrentThreadId(); |
| void *addr; |
| int old_flags; |
| int prot_mask = PAGE_EXECUTE; |
| int prot_flags = PAGE_EXECUTE_READ; |
| BOOL double_syscall = FALSE; |
| |
| if (!(argc == 2 || argc == 3) || (argc == 3 && strcmp(argv[2], "-double_syscall"))) { |
| fprintf(stderr, "Usage: %s <loop trip count> [-double-syscall]\n", argv[0]); |
| return -1; |
| } |
| if (argc == 3 && !strcmp(argv[2], "-double_syscall")) |
| double_syscall = TRUE; |
| trip_count = atoi(argv[1]); |
| addr = VirtualAlloc(NULL, 65536, MEM_RESERVE, prot_flags); |
| for (i = 0; i < trip_count; i++, syscall_count++, prot_flags ^= prot_mask) { |
| VirtualProtect(addr, 65536, prot_flags, &old_flags); |
| if (double_syscall) { |
| VirtualProtect(addr, 65536, prot_flags, &old_flags); |
| syscall_count++; |
| prot_flags ^= prot_mask; |
| } |
| } |
| VirtualFree(addr, 0, MEM_RELEASE); |
| fprintf(stderr, "Loop trips completed -- %d, syscalls completed -- %d\n", i, |
| syscall_count); |
| return 0; |
| } |