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[Bug tapsets/12500] New: ptrace decoder


http://sourceware.org/bugzilla/show_bug.cgi?id=12500

           Summary: ptrace decoder
           Product: systemtap
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: tapsets
        AssignedTo: systemtap@sources.redhat.com
        ReportedBy: jan.kratochvil@redhat.com


Created attachment 5252
  --> http://sourceware.org/bugzilla/attachment.cgi?id=5252
ptrace decoder.

Tested on:
F14 x86_64
RHEL-6.1 s390+s390x+ppc64
ia64 is untested

There is some room for improvements but it works fine.

probe syscall.ptrace.return
// TODO: _arch_ptrace_return would need to create probe variables - how?
 - A function called from probe cannot create variables like `name'.

s390x:
// FIXME: ptrace of 32-bit debuggers is not caught by SystemTap,
//        use +4 and +8 offsets for them

On RHEL-4/RHEL-5 there may be needed more #ifndef/#define's like now in
tapset/powerpc/syscalls.stp but I did not have systemtap-1.4/HEAD on those
boxes to test it.

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