Thank you Thibault, and thank you for the background Alex.

This is still not intended for review, I just demonstrate the (IMO) full branch where the end is the ability to run truss in cap mode.
I am posting individual commits from the branch for review still.

this might be a good time to move this to the FreeBSD-efi-tools package. it's probably a bug/oversight that it isn't already there.

Refresh after conflict resolution for 02c440e20404 ("hwpstate_intel: Minimize ifdef for i386 build")

Comparing to sys/x86/include/bus.h and sys/dev/ntb/ntb_hw/ntb_hw_*.c, they just call the bus_space_tag_t parameter tag, and sys/x86/include/bus.h calls the bus_space_handle_t parameter bsh while ntb calls it handle. I think you could simplify those names. A verbatim copy of ntb's definitions would seem fine.

See also D58348 and D58349

Turns out this is a lot more complicated than I thought

Update comment.

Edit comments and the man page update.

Use atomic to load p_flag.

Fix PTCHLD_TRACED_BY_ME.
Check uap->data < 0.
Use more correct type for rsrv[] to avoid compat32 conversions.
Man page editing.

@ziaee i landed everything up to but not including this diff. Let's chat with nick to finalise things.

In D58315#1338064, @markj wrote:

Why not implement this with procctl()? That seems more natural to me.

Why not implement this with procctl()? That seems more natural to me.

In D58206#1335050, @pi wrote:

iridium is normally build using poudriere for those that want to walk outside the beaten path. And there it builds fine. Please keep it.