RFR: 8199138: Add RISC-V support to Zero

[Magnus Ihse Bursie]

On 2018-03-20 14:54, Edward Nevill wrote:
> On Tue, 2018-03-20 at 08:39 +0100, Erik Helin wrote:
>> Please review the following webrev
>>> Bugid: https://bugs.openjdk.java.net/browse/JDK-8199138
>>> Webrev: http://cr.openjdk.java.net/~enevill/8199138/webrev.00
>>     32 # First, filter out everything that doesn't begin with "aarch64-"
>>     33 if ! echo $* | grep '^aarch64-\|^riscv64-' >/dev/null ; then
>>
>> Could you please update the comment on line 32 to say the same thing as
>> the code?
>>
> Hi Eirk,
>
> Thanks for this. I have updated the webrev with the above comment.
>
> http://cr.openjdk.java.net/~enevill/8199138/webrev.01
I note that in platform.m4 (sorry I didn't say this earlier), you set 
the CPU_ARCH to riscv64 as well, and not just riscv. Now I don't know 
how likely it is that OpenJDK will ever support the 32-bit version of 
riscv, but it seems like it would make more sense to define the CPU_ARCH 
as "riscv", and the CPU as "riscv64".

It's just a minor thing, if you like it the way it is, keep it.

/Magnus

>
> I have also fixed a problem encountered with the submit-hs repo where the build machine had older headers which did not define EM_RISCV.
>
> The solution is to define EM_RISCV if not already defined as is done for aarch64.
>
> IE.
>
>   #ifndef EM_AARCH64
>     #define EM_AARCH64    183               /* ARM AARCH64 */
>   #endif
> +#ifndef EM_RISCV
> +  #define EM_RISCV      243
> +#endif
>
> This now passes the submit-hs tests.
>
> Does this look OK to push now?
>
> Thanks,
> Ed.
>