i386 support

[geofft]

While looking at something else I remembered that the i386 kernel builds with -mregparm=3 -freg-struct-return, i.e., pass the first three arguments in registers (instead of on the stack, the normal ABI) and try to return structures in a register if they fit. I'm not sure if Rust and/or bindgen know how to deal with this.

If they don't, put a note in README.md and move on. If they do, let's add i386 to CI at some point....

[alex]

Before we test on i386 we need to fix c_types.rs because it is 100% x86_64 specific ATM.

…

On Sun, Jun 3, 2018 at 11:06 AM Geoffrey Thomas ***@***.***> wrote: While looking at something else I remembered that the i386 kernel builds with -mregparm=3 -freg-struct-return, i.e., pass the first three arguments in registers (instead of on the stack, the normal ABI) and try to return structures in a register if they fit. I'm not sure if Rust and/or bindgen know how to deal with this. If they don't, put a note in README.md and move on. If they do, let's add i386 to CI at some point.... — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#43>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAADBKmr_jICYocJifz13mh_ZX5EoxKzks5t4_tegaJpZM4UYHet> .

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[alex]

Same checklist as #165:

• Upstream a target to Rust (including obviously figuring out all the details of that ABI)
• Figure out how we can test it in CI (chroot?)
• Add support to c_types.rs
• Turn it all on!