[Crash-utility] [PATCH] Read in .debug_frame section of vmlinux

[Wang Chao]

Hi Dave and all,

The attached patch read the .debug_frame section of vmlinux into
crash. By doing this, we could backtrace kernel stack frame using
dwarf unwind information contained in that section.

ChangeLog:
- Modified section_header_info() function to initialize the offset
  and size of .debug_frame section.
- Modified init_unwind_table() function to read in .debug_frame.
- Modified the prototype of unwind(), adding a int argument to
  indicate whether .eh_frame or .debug_frame is used. Also there're
  a few changes due to the difference between these two sections.

Well, it's the first time I came to crash utility, and I hope that
I didn't do anything wrong.

Thanks,
Wang Chao
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