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I had to look up what you meant by "ABI frame sniffer"; we normally call this the prologue analyzer.
With the ABI sniffer 'off' it is not possible to backtrace through code that does not have CFI. On sh-elf, at least, there is always CFI when there is debug info, so it is relatively rare that the ABI sniffer is actually required.
I have not set the default to 'off' because that causes quite a number of FAILs in the testsuite.
That should be a hint...
Obviously the SH maintainers have final say, but I strongly discourage any patch along these lines. If you want to improve the fallback unwinder, go ahead. If you want to add more generic tests to terminate backtraces without annoying messages, we can discuss that. But turning it off is not viable.
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