| /* ********************************************************** |
| * Copyright (c) 2007-2010 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. |
| */ |
| |
| #ifndef ASM_CODE_ONLY /* C code */ |
| #include <stdio.h> |
| |
| void marker(void); /* in asm code */ |
| |
| int test = 1; |
| |
| int main() |
| { |
| int i = 0; |
| int count = 0; |
| do { |
| if (test) { |
| /* I can't think of a good way to do this -- I want to |
| * target a specific BB in the client, so I'll use a |
| * couple of nops as markers. |
| * |
| * Given the value of 'test', this side of the conditional |
| * should become part of a trace. |
| */ |
| /* FIXME - pick unusual nops that instr_is_nop() recognizes. |
| * 2 regular nops in a row is hit on Linux frequently so going with |
| * xchg ebp, ebp since I haven't seen that one used before (mov edi, edi |
| * or xchg eax, eax is more typical for 2 bytes). */ |
| marker(); |
| count++; |
| } |
| else { |
| count--; |
| } |
| |
| i++; |
| } while (i < 402); |
| |
| fprintf(stderr, "count = %d\n", count); |
| } |
| |
| #else /* asm code *************************************************************/ |
| #include "asm_defines.asm" |
| START_FILE |
| DECLARE_FUNC(marker) |
| GLOBAL_LABEL(marker:) |
| nop |
| xchg REG_XBP, REG_XBP |
| ret |
| END_FUNC(marker) |
| END_FILE |
| #endif |
