cvs commit: src/gnu/usr.bin/gdb/kgdb kgdb.h kld.c trgt.c
jhb at freebsd.org
Wed Jan 30 06:22:56 PST 2008
On Wednesday 30 January 2008 04:47:06 am Doug Rabson wrote:
> On 29 Jan 2008, at 23:44, John Baldwin wrote:
> > jhb 2008-01-29 23:44:34 UTC
> > FreeBSD src repository
> > Modified files:
> > gnu/usr.bin/gdb/kgdb kgdb.h kld.c trgt.c
> > Log:
> > - Rework the kld support to hook into GDB's shared library support.
> > kgdb(8) now treats kld's as shared libraries relative to the kernel
> > "binary". Thus, you can use 'info sharedlibrary' to list the kld's
> > along with 'sharedlibrary' and 'nosharedlibrary' to manage symbol
> > loading and unloading. Note that there isn't an easy way to
> > force GDB
> > to use a specific path for a shared library. However, you can use
> > 'nosharedlibrary' to unload all the klds and then use
> > 'sharedlibrary'
> > to load specific klds where it gets the kld correct and use
> > 'add-kld' for the kld's where the default open behavior doesn't
> > work.
> > klds opened via 'sharedlibrary' (and during startup) do have their
> > sections listed in 'info files'.
> > - Change the 'add-kld' command to use filename completion to
> > complete its
> > argument.
> This was how it used to work long ago (I forget exactly how long). I
> had things set up so that GDB's standard ELF shared library code would
> find KLDs automatically - you can see remnants of this in link_elf.c
> in 'ifdef GDB' sections which build an RTLD-like list of loaded files
> which GDB looked for starting at the global symbol r_debug.
This might still work for remote kgdb as the current stuff in kgdb doesn't
handle remote kgdb. The above works by redefining the so_ops to work such
that they traverse the linker_file list. The GDB stuff in link_elf.c should
make it so that the solib-svr4 stuff works with klds. I usually don't
include 'options GDB' in my kernels so didn't see that. :-/
I'll do some further testing to see if that still works. I believe that live
kgdb on amd64 has some issues in general (I think the kernel side has bugs),
but I mostly use kgdb on crash dumps so don't run into that.
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