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SPARC V9 has no frame record. The caller's %fp (biased by 2047) and return address are in slots 14 and 15 of the register window save area at fp, and are only there after the windows have been flushed to the stack.
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Teach the manual frame pointer unwinder in
_testinternalcapithe SPARC V9 frame layout. There's no frame record on SPARC: the caller's %fp (biased by 2047) and its return address are in slots 14 and 15 of the register window save area at fp, and they're only in memory after aflushw.Tested on a SPARC T7-1 and a T4-1 (Linux, GCC 16):
ManualStackUnwindTestsfails without the change and passes with it, and the unwinder walks all the way down to_start. No change on x86_64.The GNU backtrace test still fails on sparc64, that's the missing unwind tables from the issue (GCC PR 128091), not this code.