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

[mhiramat at redhat dot com]

------- Additional Comments From mhiramat at redhat dot com  2009-07-29 16:58 -------
Verified on bear Fedora11:

kernel-PAE-2.6.29.6-213.fc11.i686
systemtap-0.9.8-1.fc11.i586

Here is the c code generated by stap -p3.
---
  c->last_stmt = "identifier '$epfd' at
/usr/share/systemtap/tapset/syscalls.stp:657:37";
  if (unlikely (c->nesting+2 >= MAXNESTING)) {
    c->last_error = "MAXNESTING exceeded";
    return;
  } else {
    c->nesting ++;
  }
  l->__retvalue = 0;
  #define return goto out
  {
    {
  {
    intptr_t addr;
    { // DWARF expression: 0x71
      {
        intptr_t s0;
        s0 = fetch_register (1) + 0L;
        addr = s0;
      }
    }
    { int32_t value = deref (4, addr);THIS->__retvalue = value; }
---

fetch_register(1) is regs->cx. Should that be reg->sp(or fetch_register(4))?
BTW, this kernel is built with ftrace(mcount).

-- 


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

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