[PATCH v5 00/10] arm64: stack backtraces

[Tom Rini]

On Tue, Jul 29, 2025 at 06:07:21PM +0200, Casey Connolly wrote:

> Implement support for printing stack backtraces on ARM64, make
> framepointer support configurable by the build system with
> CONFIG_FRAMEPOINTER and teach U-Boot to walk the framepointers and
> unwind the stack when an exception occurs. Also show all 64 bits of the
> exception syndrom register (ESR).
> 
> Additionally, a new global unwind_stack() function is added, this can
> be called from anywhere to print a backtrace which can be useful when
> debugging certain problems. It is now used during panic() when available
> to provide more useful information for debugging.
> 
> A new printf format specifier is added: %pS will print a symbol name
> from an address, this is particularly useful for function pointers

This fails on sandbox because the prototype for unwind_stack is #if
guarded but usage is now if (IS_ENABLED(...)) guarded. The next problem
however is that the vsprintf.c changes aren't safe for non-ARM64:
lib/vsprintf.c: In function 'pointer':
lib/vsprintf.c:527:43: warning: cast from pointer to integer of different size [-Wpointer-to-int-cast]
  527 |                         return ptr_symbol((phys_addr_t)ptr, buf, end,
      |                   

Handling for %S will need to be #if guarded I believe. Please push the
next iteration through CI, thanks.

-- 
Tom
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