<div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:#000000">Looks like I don't completely understand what is the difference between user-mode and kernel-mode from the debugger's point of view. Could you please explain me this?</div></div><br><div class="gmail_quote"><div dir="ltr">On Wed, Oct 31, 2018 at 10:22 PM Zachary Turner <<a href="mailto:zturner@google.com">zturner@google.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I don’t totally agree with this. I think there are a lot of useful os awareness tasks in user mode. For example, you’re debugging a deadlock and want to understand the state of other mutexes, who owns them, etc. or you want to examine open file descriptors. In the case of a heap corruption you may wish to study the internal structures of your process’s heap, or even lower level, the os virtual memory page table structures.<br><br>There’s quite a lot you can still do in user mode, but definitely there is more in kernel mode. As Leonard said, try put WinDbg as a lot of this stuff already exists so it’s a good reference <br><div class="gmail_quote"><div dir="ltr">On Wed, Oct 31, 2018 at 12:08 PM Alexander Polyakov via lldb-dev <<a href="mailto:lldb-dev@lists.llvm.org" target="_blank">lldb-dev@lists.llvm.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(0,0,0)">Hi Leonard,<br><br>I think it will be kernel-mode debugging since debugging an application in user mode is not an OS awareness imo. Of course, some of kernel's modules might run in user-mode, but it will be ok I think.<br><br>Thanks for your reference, I'll take a look at it. <br><br>Also, I found out that ARM supports OS awareness in their DS-5 debugger. They have a mechanism for adding new operating systems. All you need to do is to describe OS' model (thread's or task's structure for example). I think that is how it might be done in LLDB.</div></div></div><br><div class="gmail_quote"><div dir="ltr">On Wed, Oct 31, 2018 at 9:26 PM Leonard Mosescu <<a href="mailto:mosescu@google.com" target="_blank">mosescu@google.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Hi Alexander, are you interested in user-mode, kernel-mode debugging or both?<div><br></div><div>Fore reference, the current state of the art regarding OS-awareness debugging is <a href="https://docs.microsoft.com/en-us/windows-hardware/drivers/debugger/index" target="_blank">debugging tools for windows</a> (windbg & co.). This is not surprising since the tools were developed alongside Windows. Obviously they are specific to Windows, but it's good example of how the OS-awareness might look like.</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Oct 29, 2018 at 11:37 AM, Alexander Polyakov via lldb-dev <span dir="ltr"><<a href="mailto:lldb-dev@lists.llvm.org" target="_blank">lldb-dev@lists.llvm.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr"><div dir="ltr"><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(0,0,0)">Hi lldb-dev,<br><br>I'm a senior student at Saint Petersburg State University. The one of my possible diploma themes is "OS Awareness in LLDB". Generally, the OS awareness extends a debugger to provide a representation of the OS threads - or tasks - and other relevant data structures, typically semaphores, mutexes, or queues.<br><br>I want to ask the community if OS awareness is interesting for LLDB users and developers? The main goal is to create some base on top of LLDB that can be extended to support awareness for different operating systems.</div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(0,0,0)"><br></div><div class="gmail_default" style="font-family:arial,helvetica,sans-serif;font-size:small;color:rgb(0,0,0)">Also, if you have a good article or other useful information about OS awareness, please share it with me.<br><br>Thanks in advance!</div><span class="m_8186528786610219268m_-3842292953362247924m_-3812305988982444733HOEnZb"><font color="#888888"><div><br></div>-- <br><div dir="ltr"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><span style="color:rgb(0,0,0);font-family:arial,helvetica,sans-serif;font-size:12.8px">Alexander</span><br></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></font></span></div></div>
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