Date: Thu, 13 Aug 2015 12:43:15 +0800 From: Julian Elischer <julian@freebsd.org> To: John Baldwin <jhb@freebsd.org>, freebsd-arch@freebsd.org Subject: Re: Supporting cross-debugging vmcores in libkvm (Testing needed) Message-ID: <55CC2063.9070804@freebsd.org> In-Reply-To: <5166205.rtMjEmhvmo@ralph.baldwin.cx> References: <3121152.ujdxFEovO3@ralph.baldwin.cx> <5166205.rtMjEmhvmo@ralph.baldwin.cx>
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On 8/13/15 1:50 AM, John Baldwin wrote: > On Tuesday, August 04, 2015 10:56:09 AM John Baldwin wrote: >> Many debuggers (recent gdb and lldb) support cross-architecture debugging >> just fine. My current WIP port of kgdb to gdb7 supports cross-debugging for >> remote targets already, but I wanted it to also support cross-debugging for >> vmcores. >> >> The existing libkvm/kgdb code in the tree has some limited support for >> cross-debugging. It requires building a custom libkvm (e.g. libkvm-i386.a) >> and custom kgdb for each target platform. However, gdb (and lldb) both >> support multiple targets in a single binary, so I'd like to have a single >> kgdb binary that can cross-debug anything. >> >> I started hacking on libkvm last weekend and have a prototype that I've used >> (along with some patches to my kgdb port) to debug an amd64 vmcore on an >> i386 machine and vice versa. >> >> ... >> >> What I'm mostly after is comments on the API, etc. Once that is settled I >> will move forward on converting and/or stubbing the other backends (the >> stub route would be to only support other backends on native systems for >> now). > I guess this is closer to a nuclear power plant than a bikeshed judging by the > feedback. It has "keep well clear" and "beware of the leopard" written all over it. and when you get past those you see "dragons be here".
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