[Bug translator/10408] IA-32 - stap unable to decode parameter location using DWARF

["mhiramat at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From mhiramat at redhat dot com  2009-08-20 21:09 -------
Thanks, I've checked that stap works with elfutils-0.142.

$ stap --vp 02 -r 2.6.31-rc6-tip -e 'probe kernel.function("sys_epoll_wait")
{print($epfd)}' -p2

probe sys_epoll_wait@/home/mhiramat/ksrc/linux-2.6-tip/fs/eventpoll.c:1321
kernel reloc=.dynamic section=.text pc=0xc10b3d0d
# functions
_dwarf_tvar_get_epfd_0:long ()
%{{
  {
    intptr_t addr;
  intptr_t frame_base;
  { // DWARF expression: 0x92(4,4)
    {
      intptr_t s0;
        s0 = fetch_register (4) + 4L;
      frame_base = s0;
    }
  }
    { // DWARF expression: 0x91
      {
        intptr_t s0;
        s0 = frame_base + 0L;
        addr = s0;
      }
    }
    { int32_t value = deref (4, addr);THIS->__retvalue = value; }
  }
  goto out;
if (0) goto deref_fault;
deref_fault:
  goto out;
}
/* pure */%}
# probes
kernel.function("sys_epoll_wait@/home/mhiramat/ksrc/linux-2.6-tip/fs/eventpoll.c:1321")
/* pc=_stext+0xb2c25 */ /* <- kernel.function("sys_epoll_wait") */
print(_dwarf_tvar_get_epfd_0())
Pass 2: analyzed script: 1 probe(s), 1 function(s), 0 embed(s), 0 global(s) in
540usr/90sys/628real ms.
Running rm -rf /tmp/stapgtVMtt


However, we'll need to wait for new gcc.

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=10408

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