[SOLVED] Thread Awareness for JLinkGDBServer

Hi,

Thread awareness for GDB Server is on our todo, but there is currently no fixed schedule for this.
The Thread awareness in GDB Server will somehow be plugable, so you can provide the required RTOS information via a file.

Best regards
Johannes

Hi,

In general, GDB is rather dumb as it has no information of the target system when remote debugging.

OpenOCD and GDB Server are similar, they are the remote server GDB connects to.
And GDB requests the thread information from them.
In detail it is a bit more complex, but that's on another topic.

Regards
Johannes

Hi,

sorry for the delay in response.
Unfortunately, the manual is incorrect about this at the moment.
The plugins are not available on the website, but will be included in the next version of the J-Link software,
which is scheduled for release tomorrow evening or Monday.

Best regards,
Niklas

I've installed the latest beta and my command line to load the FreeRTOS plugin. Are there any modifications for FreeRTOS that need to be made to enable support? I see in my console out that the dll was loaded properly, but when I pause execution, I only see the one thread.

Most probably the plugin does not find all the required symbols.
There was a change in FreeRTOS, that eliminated a mandatory symbol.

In this case, you should see something like this in your console:

Received symbol: pxCurrentTCB (1FFF6E0C)
Received symbol: pxReadyTasksLists (1FFF6E10)
Received symbol: xDelayedTaskList1 (1FFF6E88)
Received symbol: xDelayedTaskList2 (1FFF6E9C)
Received symbol: pxDelayedTaskList (1FFF6EB0)
Received symbol: pxOverflowDelayedTaskList (1FFF6EB4)
Received symbol: xPendingReadyList (1FFF6EB8)
Received symbol: xTasksWaitingTermination (00000000)
Received symbol: xSuspendedTaskList (1FFF6ECC)
Received symbol: uxCurrentNumberOfTasks (1FFF6EE4)
Received symbol: uxTopUsedPriority (00000000)
ERROR: Received mandatory symbol not found.

You can use the same patch as for OpenOCD to reintroduce the missing symbol:

https://github.com/gnuarmeclipse/…eRTOS-openocd.c

Hi,

it is the last received symbol "uxTopUsedPriority", return value NULL means it is not found.
I already have changed the error message in the console to a more informative one.

If your console output (starting with the first "Received symbol") is different, please post it here.

Best regards
Arne

Hi,

there was a problem within the build process causing both plug-ins to be identical in the linux and OSX builds.
This will be fixed in the next release.

I assume, you are using linux, right?
Please find attached the correctly build plug-in.

Best regards,
Arne

Hi,

good to hear that is working now.

I have also experienced lots of trouble with building the call stack in eclipse while developing the plug-ins.

Unfortunately there is nothing I can do, because this is completely done inside eclipse and the GDB server only sees some "read memory" instructions while eclipse is building the call stack.

Best regards,
Arne

Hi,

there were many different issues. Missing/empty lines in the call stack, registers disappeared from the registers pane up to complete crash of eclipse.

You could try another IDE as a workaround, for example our own IDE Embedded Studio. It is available free of charge for non-profit educational purposes, supports Windows, Linux and Mac OSX and has an interface for viewing threads, too.

Best regards,
Arne

Quote from SEGGER - Arne

Most probably the plugin does not find all the required symbols.
There was a change in FreeRTOS, that eliminated a mandatory symbol.

In this case, you should see something like this in your console:

Code

Received symbol: pxCurrentTCB (1FFF6E0C)
Received symbol: pxReadyTasksLists (1FFF6E10)
Received symbol: xDelayedTaskList1 (1FFF6E88)
Received symbol: xDelayedTaskList2 (1FFF6E9C)
Received symbol: pxDelayedTaskList (1FFF6EB0)
Received symbol: pxOverflowDelayedTaskList (1FFF6EB4)
Received symbol: xPendingReadyList (1FFF6EB8)
Received symbol: xTasksWaitingTermination (00000000)
Received symbol: xSuspendedTaskList (1FFF6ECC)
Received symbol: uxCurrentNumberOfTasks (1FFF6EE4)
Received symbol: uxTopUsedPriority (00000000)
ERROR: Received mandatory symbol not found.

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You can use the same patch as for OpenOCD to reintroduce the missing symbol:

https://github.com/gnuarmeclipse/…eRTOS-openocd.c

This worked! Thanks for the help!