Get user stackpointer from task_struct

[Shirish Gajera]

Hi,

I have kcore and I want to get userspace backtrace from kcore. I looked at
some macro <https://www.kernel.org/doc/Documentation/kdump/gdbmacros.txt> but
still this is just giving me kernel backtrace only. What I want is
userspace backtrace.

Good news is I have pointer to task_struct.

task_struct->thread->sp (Kernel stack pointer)
task_struct->thread->usersp (user stack pointer) but this is junk

My question is how to get userspace backtrace (or stack pointer) from kcore
or task_struct ?

- Shirish
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