[PTLsim-devel] Having problems getting -stoprip to work

Fri May 25 14:15:30 EDT 2007

Hi,
   I'm trying to improve the performance of a section of code using
prefetches.  At the moment it seems to help but not as much as I would
have thought, so I was hoping to use ptlsim in userspace mode to throw
some light on what's going on at the chip level.
   To do this I'm looking to profile a very small amount of the program
and was hoping to use -startrip and -stoprip to do this.  Even on a
small test case I can't seem to get -stoprip to work.  The input program
is:

int main (void) {
        return 1;
}

which objdump gives as:

08048384 :
 8048384:       8d 4c 24 04             lea    0x4(%esp),%ecx
 8048388:       83 e4 f0                and    $0xfffffff0,%esp
 804838b:       ff 71 fc                pushl  0xfffffffc(%ecx)
 804838e:       55                      push   %ebp
 804838f:       89 e5                   mov    %esp,%ebp
 8048391:       51                      push   %ecx
 8048392:       83 ec 10                sub    $0x10,%esp
 8048395:       b8 01 00 00 00          mov    $0x1,%eax
 804839a:       83 c4 10                add    $0x10,%esp
 804839d:       59                      pop    %ecx
 804839e:       5d                      pop    %ebp
 804839f:       8d 61 fc                lea    0xfffffffc(%ecx),%esp
 80483a2:       c3                      ret    
 80483a3:       90                      nop    

I'm using the following options:

-logfile test.log -loglevel 6 -stats test.stats -stoprip 0x804838e

and I get the following log file:

//  
//  PTLsim: Cycle Accurate x86 Simulator (32-bit version)
//  Copyright 1999-2007 Matt T. Yourst <yourst at yourst.com>
// 
//  Revision 219 (2007-05-13)
//  Built May 23 2007 17:01:39 on ralph.cs.bath.ac.uk using gcc-4.1
//  Running on ralph.
//  
//  Arguments: ./test
//  Thread 15612 is running in 32-bit x86 mode
//  

Active parameters:
  -core         ooo
  -quiet        disabled
  -logfile      test.log
  -loglevel     6

  -stopinsns    infinity
  -stopcycle    infinity
  -stopiter     infinity
  -stoprip      134513550

but it doesn't stop when it reaches 0x804838e.

Can anyone point me in the direction of what I'm doing wrong?

Cheers,
 - Martin