blob: 852e52ce03109d658fcb959bddd4f57efa903737 [file] [log] [blame]
/* **********************************************************
* 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;
}