[Bug 215783] devel/gdb: Add MIPS support

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=215783

            Bug ID: 215783
           Summary: devel/gdb: Add MIPS support
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: freebsd-ports-bugs at FreeBSD.org
          Reporter: jhb at FreeBSD.org
                CC: luca.pizzamiglio at gmail.com, sbruno at FreeBSD.org
                CC: luca.pizzamiglio at gmail.com
             Flags: maintainer-feedback?(luca.pizzamiglio at gmail.com)

Created attachment 178528
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=178528&action=edit
gdb_mips.patch

This patch includes two upstream commits to add support for FreeBSD/mips user
binaries as well as a new backend from my freebsd-7.12-kgdb branch that adds
support for debugging FreeBSD/mips kernels to kgdb.

I've tested cross-debugging of process cores and kernel cores on amd64 as well
as running a native gdb in qemu for user binaries.

There is still an open issue with gdb not recognizing mips64 core dumps.  I
have a pending patch in review to add a workaround to binutils, though the real
bug is in the kernel.

I have done my testing from my git branch, and I have only build-tested the
port update on amd64. I've cc'd Sean hoping he can use the qemu-user magic to
build a gdb package for mips for testing?

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