2 Attachment(s)
[DynamoRIO] Counting every opcode of CoD2MP.exe
DynamoRIO was a long time on my radar, but I never really managed to be productive with it. It is a "binary translator", which can be used for all kind of Reverse Engineering purposes.
Now I downloaded it for Windows and it worked straight away.
A simple test:
1) Download DynamoRIO:
https://github.com/DynamoRIO/dynamorio/wiki/Downloads
Direct link: https://github.com/DynamoRIO/dynamor...ws-6.1.1-3.zip
Unzip it to C:\dr
2) Make a file named dynamorio.bat next to your CoD2MP.exe:
Code:
C:\dr\bin32\drrun.exe -c C:\dr\samples\bin32\opcodes.dll -- CoD2MP_s.exe
3) Filthy part, because it needs admin rights: start cmd.exe as admin, e.g. go into Task Manager -> File -> New Task, enter cmd and mark [X] Run as admin
Then "cd" into your CoD2 directory and simply enter "dynamorio.bat", it should show something like this:
Code:
C:\Windows\system32>cd G:\DATA\GAMES\CoD2 1.3
C:\Windows\system32>g:
G:\DATA\GAMES\CoD2 1.3>dynamorio.bat
G:\DATA\GAMES\CoD2 1.3>C:\dr\bin32\drrun.exe -c C:\dr\samples\bin32\opcodes.dll -- CoD2MP_s.exe
Client opcodes is running
G:\DATA\GAMES\CoD2 1.3>
For some reason "rightclick->run as admin" on the .bat doesn't work
4) Now CoD2MP.exe should start, but it is extremly slow, because every opcode is basically counted. After entering quit in console, this window should appear:
Attachment 1093
There are quite some examples, which can be used to play around with the opcodes of the instrumentalized process:
Attachment 1094
I took a look into opcodes.c, but tbh I have no clue how the opcodes are actually counted. Take a look yourself:
PHP Code:
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* 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.
*/
/* Code Manipulation API Sample:
* opcodes.c
*
* Reports the dynamic count of the total number of instructions executed
* broken down by opcode.
*/
#include "dr_api.h"
#include "drx.h"
#include <stdlib.h> /* qsort */
#ifdef WINDOWS
# define DISPLAY_STRING(msg) dr_messagebox(msg)
#else
# define DISPLAY_STRING(msg) dr_printf("%s\n", msg);
#endif
#define NULL_TERMINATE(buf) buf[(sizeof(buf)/sizeof(buf[0])) - 1] = '\0'
/* We keep a separate execution count per opcode.
*
* XXX: our counters are racy on ARM. We use DRX_COUNTER_LOCK to make them atomic
* (at a perf cost) on x86.
*
* XXX: we're using 32-bit counters. 64-bit counters are more challenging: they're
* harder to make atomic on 32-bit x86, and drx does not yet support them on ARM.
*/
enum {
#ifdef X86
ISA_X86_32,
ISA_X86_64,
#elif defined(ARM)
ISA_ARM_A32,
ISA_ARM_THUMB,
#endif
NUM_ISA_MODE,
};
static uint count[NUM_ISA_MODE][OP_LAST+1];
#define NUM_COUNT sizeof(count[0])/sizeof(count[0][0])
/* We only display the top 15 counts. This sample could be extended to
* write all the counts to a file.
*
* XXX: DynamoRIO uses a separate stack for better transparency. DynamoRIO stack
* has limited size, so we should keep NUM_COUNT_SHOW small to avoid the message
* buffer (char msg[NUM_COUNT_SHOW*80]) in event_exit() overflowing the stack.
* It won't work on Windows either if the output is too large.
*/
#define NUM_COUNT_SHOW 15
static void event_exit(void);
static dr_emit_flags_t event_basic_block(void *drcontext, void *tag, instrlist_t *bb,
bool for_trace, bool translating);
DR_EXPORT void
dr_client_main(client_id_t id, int argc, const char *argv[])
{
dr_set_client_name("DynamoRIO Sample Client 'opcodes'",
"http://dynamorio.org/issues");
/* register events */
dr_register_exit_event(event_exit);
dr_register_bb_event(event_basic_block);
/* make it easy to tell, by looking at log file, which client executed */
dr_log(NULL, LOG_ALL, 1, "Client 'opcodes' initializing\n");
#ifdef SHOW_RESULTS
/* also give notification to stderr */
if (dr_is_notify_on()) {
# ifdef WINDOWS
/* ask for best-effort printing to cmd window. must be called at init. */
dr_enable_console_printing();
# endif
dr_fprintf(STDERR, "Client opcodes is running\n");
}
#endif
}
#ifdef SHOW_RESULTS
/* We use cur_isa to iterate each ISA counters in event_exit, so there will be
* no race on accessing it in compare_counts.
*/
static uint cur_isa;
static int
compare_counts(const void *a_in, const void *b_in)
{
const uint a = *(const uint *)a_in;
const uint b = *(const uint *)b_in;
if (count[cur_isa][a] > count[cur_isa][b])
return 1;
if (count[cur_isa][a] < count[cur_isa][b])
return -1;
return 0;
}
static const char *
get_isa_mode_name(uint isa_mode)
{
#ifdef X86
return (isa_mode == ISA_X86_32) ? "32-bit X86" : "64-bit AMD64";
#elif defined(ARM)
return (isa_mode == ISA_ARM_A32) ? "32-bit ARM" : "32-bit Thumb";
#else
return "unknown";
#endif
}
#endif
static void
event_exit(void)
{
#ifdef SHOW_RESULTS
char msg[NUM_COUNT_SHOW*80];
int len, i;
size_t sofar = 0;
/* First, sort the counts */
uint indices[NUM_COUNT];
for (cur_isa = 0; cur_isa < NUM_ISA_MODE; cur_isa++) {
sofar = 0;
for (i = 0; i <= OP_LAST; i++)
indices[i] = i;
qsort(indices, NUM_COUNT, sizeof(indices[0]), compare_counts);
if (count[cur_isa][indices[OP_LAST]] == 0)
continue;
len = dr_snprintf(msg, sizeof(msg)/sizeof(msg[0]),
"Top %d opcode execution counts in %s mode:\n",
NUM_COUNT_SHOW, get_isa_mode_name(cur_isa));
DR_ASSERT(len > 0);
sofar += len;
for (i = OP_LAST - 1 - NUM_COUNT_SHOW; i <= OP_LAST; i++) {
if (count[cur_isa][indices[i]] != 0) {
len = dr_snprintf(msg + sofar, sizeof(msg)/sizeof(msg[0]) - sofar,
" %9lu : %-15s\n", count[cur_isa][indices[i]],
decode_opcode_name(indices[i]));
DR_ASSERT(len > 0);
sofar += len;
}
}
NULL_TERMINATE(msg);
DISPLAY_STRING(msg);
}
#endif /* SHOW_RESULTS */
}
static uint
get_count_isa_idx(void *drcontext)
{
switch (dr_get_isa_mode(drcontext)) {
#ifdef X86
case DR_ISA_X86:
return ISA_X86_32;
case DR_ISA_AMD64:
return ISA_X86_64;
#elif defined(ARM)
case DR_ISA_ARM_A32:
return ISA_ARM_A32;
break;
case DR_ISA_ARM_THUMB:
return ISA_ARM_THUMB;
#endif
default:
DR_ASSERT(false); /* NYI */
}
return 0;
}
static dr_emit_flags_t
event_basic_block(void *drcontext, void *tag, instrlist_t *bb,
bool for_trace, bool translating)
{
instr_t *instr;
instr_t *first = instrlist_first_app(bb);
uint isa_idx = get_count_isa_idx(drcontext);
#ifdef VERBOSE
dr_printf("in dynamorio_basic_block(tag="PFX")\n", tag);
# ifdef VERBOSE_VERBOSE
instrlist_disassemble(drcontext, tag, bb, STDOUT);
# endif
#endif
for (instr = instrlist_first_app(bb);
instr != NULL;
instr = instr_get_next_app(instr)) {
/* We insert all increments sequentially up front so that drx can
* optimize the spills and restores.
*/
drx_insert_counter_update(drcontext, bb, first,
SPILL_SLOT_1, IF_ARM_(SPILL_SLOT_2)
&count[isa_idx][instr_get_opcode(instr)], 1,
/* DRX_COUNTER_LOCK is not yet supported on ARM */
IF_X86_ELSE(DRX_COUNTER_LOCK, 0));
}
#if defined(VERBOSE) && defined(VERBOSE_VERBOSE)
dr_printf("Finished instrumenting dynamorio_basic_block(tag="PFX")\n", tag);
instrlist_disassemble(drcontext, tag, bb, STDOUT);
#endif
return DR_EMIT_DEFAULT;
}
Any ideas how this could be of use?