Merge tag 'bsd-user-2023q1-pull-request' of gitlab.com:bsdimp/qemu into staging

2023 Q1 bsd-user upstreaming: bugfixes and sysctl

[ letter edited -- need reviews for these hunks
     bsd-user: Helper routines h2g_old_sysctl
     bsd-user: various helper routines for sysctl
]

This group of patches gets the basic framework for sysctl upstreamed. There's a
lot more to translate far too many binary blobs the kernel publishes via
sysctls, but I'm leaving those out in the name of simplicity.

There's also a bug fix from Doug Rabson that fixes a long int confusion leading
to a trunctation of addresses (oops)

There's a fix for the -static option, since clang hates -no-pie and needs only
-fno-pie.

Finally, I'm changing how I'm upstreaming a little. I'm doing a little deeper
dives into our rather chaotic repo to find a couple of authors I might have
missed. From here on out, I'll be using the original author's name as the git
author. I'll also tag the co-authors better as well when there's multiple people
that did something (other than reformat and/or move code around). I've
discovered more code moved about than I'd previously known. This seems more in
line with standard practice.

v3->pull:
o minor	tweaks in the conditional reviews around formatting
o fix all errors for check patch and am	OK with	remaining warnings for
  line length that's only slightly too long
o edited letter for changes in review process

v3:
o Removed -strict, it's not ready and needs a complete rethink.
o Add g_assert_not_reached()
o target -> guest in most places
o Use MIN() to simplify things
o Better types in many places (abi_int instead of int32_t)
o Use ARRAY_COUNT
o fix tabs copied from FreeBSD sources to spaces

v2:
o Created various helper functions to make the code a little better
o split a few patches that I thought would be approved together but
  that generated commentary. It's easier to manage 1 per patch for
  those.
o Add/delete G_GNU_UNUSED to ensure all patches compile w/o warnings
o Fix 64-bit running 32-bit binary to get a LONG or ULONG. Add a
  bounce buffer for these so we don't overflow anything on the target
  and return all the elements of arrays.
o Fixed a number of nits noticed in the review.
o Add or improve comments to explain things there were questions on
  during the review.
o fix noted typos
o fix host != target page size differences
o Add pointers to FreeBSD source code, as appropriate
o fix locking (mostly unlocking) on error paths
o Note: -strict feedback not yet applied due to large numbers of changes
  from the rest. Next round.

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* tag 'bsd-user-2023q1-pull-request' of gitlab.com:bsdimp/qemu:
  bsd-user: implement sysctlbyname(2)
  bsd-user: do_freebsd_sysctl helper for sysctl(2)
  bsd-user: Start translation of arch-specific sysctls
  bsd-user: common routine do_freebsd_sysctl_oid for all sysctl variants
  bsd-user: sysctl helper funtions: sysctl_name2oid and sysctl_oidfmt
  bsd-user: Helper routines oidfmt
  bsd-user: various helper routines for sysctl
  bsd-user: Add sysarch syscall
  build: Don't specify -no-pie for --static user-mode programs
  bsd-user: Don't truncate the return value from freebsd_syscall

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

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