File: nested_vars.stp

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#! stap -gp4

global x
function f(x) { return x }

probe kernel.function("do_execve")
{
  if (@defined($__argv)) {
    x = $__argv[$__argv[f(0)][f(1)]][$__argv[f(2)][f(3)]]
    $__argv[$__argv[f(4)][f(5)]][2] = x
  } else if (@defined($argv)) {
    x = $argv[$argv[f(0)][f(1)]][$argv[f(2)][f(3)]]
    $argv[$argv[f(4)][f(5)]][2] = x
  }
}

probe kernel.trace("printk:console") ?
{
  x = $text[$text[1]]
  $text[$text[0]] = x
}