Date: Fri, 2 Oct 2015 07:39:01 -0700 From: Navdeep Parhar <np@FreeBSD.org> To: Andriy Gapon <avg@FreeBSD.org> Cc: John Baldwin <jhb@FreeBSD.org>, freebsd-current@FreeBSD.org Subject: Re: kgdb ported to devel/gdb Message-ID: <20151002143901.GA16147@ox> In-Reply-To: <560E21E1.6010002@FreeBSD.org> References: <2662739.EWKL7pkiRb@ralph.baldwin.cx> <560E21E1.6010002@FreeBSD.org>
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On Fri, Oct 02, 2015 at 09:19:13AM +0300, Andriy Gapon wrote: > On 01/09/2015 00:32, John Baldwin wrote: > > Over the past several months I have ported kgdb to the version of gdb in ports. > > I have a pending patch to the gdb port to add fork following, but once that is > > done (and possibly after updating to 7.10) I will try to add my existing work > > as a KGDB option on the port. Until such time, you can try the newer kgdb by > > checking out my branch from git. > > > > Here's my cheat sheet on how to build the newer kgdb. Note that if you build > > a world with my cross-libkvm patches you should get a kgdb that can debug > > i386 cores on amd64 and vice versa. > > > > All of the targets that the native devel/gdb support have their backends > > ported (so x86, sparc64, powerpc and powerpc64). I have not yet ported > > arm or mips since those don't work for userland yet in upstream gdb. I > > have only compiled non-x86 backends. Testing of the new kgdb on sparc64 > > and powerpc would be appreciated. > > > > Steps: > > > > % git clone https://github.com/bsdjhb/gdb.git > > % git checkout freebsd-7.9.1-kgdb > > % fetch http://www.freebsd.org/~jhb/gdb/build > > % pkg install devel/gdb > > > > # Having gdb installed will mean you get the python bindings in the right > > # place. > > > > % pkg install gmake > > > > # I think this is the only build tool you need? > > > > % ./build > > % cd obj > > > > # Replace 'obj' with 'obj.<arch>' for all but amd64 > > > > % gmake > > > > # ... wait > > > > You will now have a binary at 'obj/gdb/kgdb'. I just run it from my obj > > tree currently when testing. Once it becomes part of the port it will get > > installed as /usr/local/bin/kgdb791 or some such. > > John, > > first of all, thank you very much for this! > > I followed your instructions substituting freebsd-7.10-kgdb for > freebsd-7.9.1-kgdb branch (devel/gdb is also at version 7.10) and the build > process worked just fine. > However, when I try to use the new kgdb it works, but I get some annoying > diagnostics: > > ... Andriy, The patch is also available in D3727. I downloaded the raw diff from there, applied it to $PORTS/devel/gdb, and built it as a port (with the KGDB support option enabled of course). Everything works. Can you try that? https://reviews.freebsd.org/D3727 Regards, Navdeep
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