x86_64 port and BSP (GSoC 2018)

[Sebastian Huber]

On 14/05/18 14:34, Joel Sherrill wrote:
>
>
> On Mon, May 14, 2018, 7:12 AM Sebastian Huber 
> <sebastian.huber at embedded-brains.de 
> <mailto:sebastian.huber at embedded-brains.de>> wrote:
>
>     On 14/05/18 14:09, Joel Sherrill wrote:
>     > On Mon, May 14, 2018, 7:07 AM Sebastian Huber
>     > <sebastian.huber at embedded-brains.de
>     <mailto:sebastian.huber at embedded-brains.de>
>     > <mailto:sebastian.huber at embedded-brains.de
>     <mailto:sebastian.huber at embedded-brains.de>>> wrote:
>     >
>     >     On 14/05/18 13:14, Amaan Cheval wrote:
>     >     > Regarding naming, how about we settle on something like
>     >     > "bsps/amd64/amd64_generic", borrowing from how the riscv
>     target is
>     >     > structured?
>     >
>     >     In case you want to name the new architecture "amd64", then
>     the tool
>     >     chain should be renamed as well, currently we have
>     >     x86_64-rtems5-gcc, etc.
>     >
>     >
>     > The target is picked after the GNU target name. We have always
>     agreed
>     > with the GNU target name.
>
>     Ok, makes sense. Will the new stuff support the 32-bit instruction
>     set?
>
>
> I have no idea. On a native Linux or BSD toolset, does -m32 produce 
> the same 32 bit ABI code as i386-elf?
>
> I am pretty sure our x86_64 toolset does not have the 32 bit multilibs.
>
> In fairness, even though x86_64 appears to be the canonical name, 
> maybe amd64 is an acceptable alias. Internally, the tools use x86_64 
> though.
>
> I would prefer to stick to the canonical name internally.

All targets use the canonical name up to now (riscv is a small exception 
with riscv32 and riscv64). I would not make an exception for the current 
Intel architecture invented by AMD. Either name it x86 (if there is a 
potential 32-bit support, why would you use it?) or x86_64.

-- 
Sebastian Huber, embedded brains GmbH

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