[Bug 252860] arm64 PT_GETDBREGS does not expose watchpoint registers

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=252860

            Bug ID: 252860
           Summary: arm64 PT_GETDBREGS does not expose watchpoint
                    registers
           Product: Base System
           Version: CURRENT
          Hardware: arm64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: bugs at FreeBSD.org
          Reporter: mgorny at gentoo.org

We're working on improving arm64/FreeBSD support in LLDB, and we've noticed
that -- unless we're mistaken -- the kernel code responsible for PT_GETDBREGS
and PT_SETDBREGS handles breakpoint registers only.

I'm specifically referring to the fill_dbregs() function at:

https://cgit.freebsd.org/src/tree/sys/arm64/arm64/machdep.c?id=5f66d5a313bf2b2254de92b2915e48e5cf528893#n320

It needs to be extended to include watchpoint registers if we're going to use
hardware watchpoints on FreeBSD.  However, I'm not really sure how to do that
without breaking the ABI -- though I'm not sure if anything is actually using
it at this point.

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