[Bug 241542] emulators/qemu-user-static: Add support for reading AArch64 Instruction Set Attribute/Processor Feature registers

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=241542

            Bug ID: 241542
           Summary: emulators/qemu-user-static: Add support for reading
                    AArch64 Instruction Set Attribute/Processor Feature
                    registers
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: sbruno at FreeBSD.org
          Reporter: dmgk at freebsd.org
          Assignee: sbruno at FreeBSD.org
             Flags: maintainer-feedback?(sbruno at FreeBSD.org)

Support for freebsd/arm64 is in the process of getting merged by the Go Project
and while the build works on real hardware, it currently fails with signal 4
Illegal Instruction under qemu-user-static emulation of aarch64 due to the
missing support for reading ID_AA64ISAR{0,1}_EL1 and ID_AA64PFR0_EL1 registers
[1], [2]

[1]
https://github.com/golang/go/blob/master/src/runtime/os_freebsd_arm64.go#L40
[2]
https://github.com/golang/go/blob/master/src/runtime/sys_freebsd_arm64.s#L521

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