Date: Tue, 7 Feb 2017 12:47:01 -0600 From: John Marino <freebsd.contact@marino.st> To: freebsd-arm@freebsd.org Cc: Andreas Tobler <andreastt@gmail.com> Subject: ARM64: PC/IP not saved in signal frame Message-ID: <530c18cd-d50d-4709-a0ca-22324a0cb592@marino.st>
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Hi guys, I've been struggling to provide unwind support on the aarch64-*-freebsd* target of FreeBSD. The only working example on this arch is aarch64-linux (attached). I think I'm 99% done with the freebsd version (attached) but the last value that needs to be pass to the _Unwind_FrameState is the program counter offset. I know the PC is not register-based on aarch64. Linux still saves the value in the signal context, but AFAICT FreeBSD does not. Can somebody A) confirm that the program counter is missing from the saved signal context B) confirm that it needs to be added for proper signal frame unwinding? Alternatively, maybe somebody can figure out a solution given the current freebsd structures, but I'm losing hope on that one. (line 99) Regards, John
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