#0  0x38026582 in do_syscall_WRK () at m_syscall.c:56
  51:    might return a large offset.  Therefore we must not anymore test
  52:    for < 0, but test for a real error by making sure the value in %eax
  53:    is a real error number.  Linus said he will make sure the no
  54:    syscall returns a value in -1 .. -4095 as a valid result so we can
  55:    safely test with -4095.
  56: */
  57: SysRes VG_(mk_SysRes_x86_linux) ( UInt val ) {
  58:    SysRes res;
  59:    res.isError = val >= -4095 && val <= -1;
  60:    res.val     = res.isError ? -val : val;
  61:    return res;