[lldb-dev] did anyone konw LLDB support lldb + openocd to run dotest.py in bare board like ARM or other non-x86 architecture?

Tatyana Krasnukha via lldb-dev lldb-dev at lists.llvm.org
Fri Oct 27 06:53:55 PDT 2017

It seems that ‘process launch’ tries to launch gdb-server that is already started manually, try to attach instead.

I also met ‘remote-gdb-server’ platform, maybe it fits your goal better? Didn’t you try to do something like this?
dotest.py --platform-name=remote-gdb-server --platfrom-url=connect://hostname:port --arch=architecture ...

From: lldb-dev [mailto:lldb-dev-bounces at lists.llvm.org] On Behalf Of cui bixiong via lldb-dev
Sent: Friday, 27 October, 2017 9:41 AM
To: Greg Clayton <clayborg at gmail.com>
Cc: lldb-dev <lldb-dev at lists.llvm.org>
Subject: Re: [lldb-dev] did anyone konw LLDB support lldb + openocd to run dotest.py in bare board like ARM or other non-x86 architecture?

Hi :

    I build a armhf qemu enviroment to test ARM lldb + lldb-server testsuite.  source code base on LLVM + LLDB + LLD + CLANG formal release 5.0.0.

    Target: lldb-server platform --listen *:3333 --server

    Host :

    (lldb) platform select remote-linux
    Platform: remote-linux
    Connected: no
    (lldb) platform connect connect://<https://urldefense.proofpoint.com/v2/url?u=http-3A__0.0.0.0-3A3333&d=DwMFaQ&c=DPL6_X_6JkXFx7AXWqB0tg&r=yfnu24japkhNGh-WqJObHXmH3mINtC_2FO828lrNpM0&m=uN6_uN-vbhkIBUYfgaia_IIUZ-KsQTwmy_orALFBdnw&s=gG9WkTsbhG3Ylm1kB0uyHUObWovqkIKU8ax052TDtxY&e=>
    Platform: remote-linux
    Triple: arm-*-linux-gnueabihf
    OS Version: 3.2.0 (3.2.0-4-vexpress)
    Kernel: #1 SMP Debian 3.2.51-1
    Hostname: debian-armhf.""
    Connected: yes
    WorkingDir: /root
    (lldb) file ./hello.exe
    Current executable set to './hello.exe' (arm).
    (lldb) log enable gdb-remote packets
    (lldb) process launch
    history[1] tid=0x6192 <   1> send packet: +
    history[2] tid=0x6192 <  19> send packet: $QStartNoAckMode#b0
    history[3] tid=0x6192 <   1> read packet: +
    history[4] tid=0x6192 <   6> read packet: $OK#9a
    history[5] tid=0x6192 <   1> send packet: +
    history[6] tid=0x6192 <  13> send packet: $qHostInfo#9b
    history[7] tid=0x6192 < 297> read packet:                  $triple:61726d2d2d6c696e75782d676e75656162696866;ptrsize:4;distribution_id:64656269616e;watchpoint_exceptions_received:before;endian:little;os_version:3.2.0;os_build:332e322e302d342d7665787072657373;os_kernel:233120534d502044656269616e20332e322e35312d31;hostname:64656269616e2d61726d68662e2222;#1a
    history[8] tid=0x6192 <  18> send packet: $qGetWorkingDir#91
    history[9] tid=0x6192 <  14> read packet: $2f726f6f74#a4
    history[10] tid=0x6192 <  19> send packet: $qQueryGDBServer#cb
    history[11] tid=0x6192 <   7> read packet: $E04#a9
    history[12] tid=0x6192 <  73> send packet: $qModuleInfo:2e2f68656c6c6f2e657865;61726d2d2d6c696e75782d656162696866#b7
history[13] tid=0x6192 <   7> read packet: $E03#a8
history[14] tid=0x6192 <  69> send packet: $qModuleInfo:6c6962632e736f2e36;61726d2d2d6c696e75782d656162696866#7b
    history[15] tid=0x6192 <   7> read packet: $E03#a8
<  36> send packet: $qLaunchGDBServer;host:mtkslt202;#b1
    error: unable to launch a GDB server on 'debian-armhf.""'

     i show host and port is uncorrect, is it a bug?

Best Regards

On Tue, Oct 24, 2017 at 11:04 PM, Greg Clayton <clayborg at gmail.com<mailto:clayborg at gmail.com>> wrote:

On Oct 24, 2017, at 12:02 AM, cui bixiong <cuibixiong at gmail.com<mailto:cuibixiong at gmail.com>> wrote:


    sorry, i'm confuse, in my mind, lldb-server maybe like gdb-server, running on Linux-like platform  listening RSP command which send form gdb and use ptrace syscall to debug which you want to debug program

    is it support remote download to batch mode run all testsuite? certainly i think reset baseboard is very important feature too,  but in lldb-server maybe not support currently i guess.

Yes lldb-server does support a full connection to a remote OS. On baseboards you are typically debugging the entire OS so lldb-server won't work because you have to OS to run it in the background. Supporting the test suite on baseboards will take some effort.

Best Regards

On Mon, Oct 23, 2017 at 11:06 PM, Greg Clayton <clayborg at gmail.com<mailto:clayborg at gmail.com>> wrote:

> On Oct 22, 2017, at 6:21 AM, cuibixiong via lldb-dev <lldb-dev at lists.llvm.org<mailto:lldb-dev at lists.llvm.org>> wrote:
> Hi
>       did anyone konw LLDB support lldb + openocd to run dotest.py in bare board like ARM or other non-x86 architecture?

We run the test suite on iOS devices using the platform stuff. This requires a running lldb-server on the remote system, so we only have the test suite running when we have the lldb-server running in platform mode on the other side. For this to work with baseboards, we would need the JTAG box to respond to many GDB remote protocol packets that "lldb-server platform" implements. I am sure for baseboards the test suite would need to be modified. A few ideas there:
- Have the test suite watch for a triple with no os (like "arm64-none-none") and have it go into a baseboard mode
- Many tests that might rely on writing to files, reading from files for stdin, and others, would need to be skipped in this mode
- Any tests that build and debug shared libraries would either need to be modified to build multiple static binaries or skipped
- We might need to make a Bareboard platform and would load the ELF files into memory instead of copying them over like the current platforms do

So there would be quite a lot of modifications required to get the test suite running. We will be happy to help you if you choose to try this.

Greg Clayton

> Best Regards
> —cuibixiong
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