[PATCH RFC 0/3] ARM64: add symbol name lookup and print a backtrace on exception

[Tom Rini]

On Wed, Jul 10, 2024 at 06:26:17PM +0200, Caleb Connolly wrote:

> U-Boot already emits frame pointers on ARM64, but lacks the code to
> parse them, as well as a mechanism for looking up symbol names at
> runtime.
> 
> There was some (seemingly?) leftover code for symbols lookups in
> common/kallsyms.c and associated parts in the makefile, however it
> appears to be entirely unused and unsupported. It relied on generating
> one long string of all symbol addresses and names.
> 
> The approach taken here is instead largely based on the implementation
> in the Xen hypervisor, it performs basic compression using non-ASCII
> bytes to tokenize repeated string segments which can later be expanded
> back out at runtime.
> 
> This is then utilized in the ARM64 interrupt handling routine to dump a
> backtrace in the show_regs() debug function. As well as providing a
> general purpose unwind_stack() function which can be used for debugging.

Just a few minor comments from me in general, and I'm glad to see this.
Please submit the next version non-RFC, thanks.

-- 
Tom
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