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Re: Futher clarification of Kernel source map

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Re: Futher clarification of Kernel source map

Subject: Re: Futher clarification of Kernel source map
From: Brian Bechtel <email@hidden>
Date: Thu, 19 May 2016 08:59:10 -0700

You don't really give enough information to provide anything other than general guidance.

Figure out what lldb thinks is the path it's using from the dSYM.

For an arbitrary frame, such as

li * 0xffffff8010e53ee0

This should return a path. Then tell lldb to replace that path with a path to your source, e.g.

settings append target.source-map /path/not/to/binary/but/to/source /Users/psinha/xnu_srcs/xnu-2782.10.72/bsd/netinet/

and note that the second path needs to be absolute, i.e. /Users, not Users.

On Wed, May 18, 2016 at 7:07 PM, Prokash Sinha <email@hidden> wrote:

Hi All,

I tried the same thing on kernel, kernel.development, kernel.debug.

Also I did set DEBUG=1 ( which did not make much sense, and did not work ).

If I set a break point in any of the hot path ( like, tcp_connect), it gets hit quite often. But I never see the sources when I go up and down the frames.

I know for fact, that any kext I built can see the source, well of course I only tried for debug built).

It would be of real help, if someone tell me what is going wrong.

Basically can I do source level stepping given that I have the correct build for KernelDebug kit that matches with xnu kernel source.

There are articles on how to have a gdb stub on the VM ( 10.10 osx), but the host osx does not have gdb. I can build gdb using auto tools on open source, but not sure if lldb could do this. Furthermore all the articles shows how to setup and break into the kernel, but not source level stepping.

Not sure if source-map is the right thing or not. On gdb kernel debugging directory add works all the time.

Prokash
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	>Futher clarification of Kernel source map (From: Prokash Sinha <email@hidden>)

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