RFR: 8199138: Add RISC-V support to Zero

[Edward Nevill]

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 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.