openjdk6-mips port added to icedtea server

[Paulo César Pereira de Andrade]

LIU Qi wrote:

> On Fri, Oct 22, 2010 at 11:12:43AM +0200, Mark Wielaard wrote:
>  > Hi,
>  >
>  > LIU Qi asked if the openjdk6-mips port for Longsoon they have been
>  > hacking on could be hosted on the icedtea server so it could be shared
>  > with a wider audience. So it has been added:
>  >   http://icedtea.classpath.org/hg/openjdk6-mips/

  Hi,

  Sorry for hijacking the thread, but I started recently adding
support for mips in my fork of the lightning jit generator, at

http://github.com/pcpa/lightning

This is done as a personal project (no companies of official
projects involved, I use lightning for jit in a language I am
writing...), as I have access to an older gdium sample; I also
wrote a very good share of the Xorg siliconmotion driver for
smi 501/502 like 2 years ago, also for the gdium.

  Any pointers on these would be useful:
o How to pass float and double arguments so that they would work
  if calling a prototyped or not prototyped function; floats are
  ok if working only with prototyped functions
  My current guess, before working on it again, and writing some
  basic tests with gcc calling a jit function and then inspecting
  registers is that:
  a0+a1 first double
  a2+a3 second double
  f12 first float
  f13 second float
  f14 third float
  f15 fourth float
o Pointers to download of images (for godson/loongson) of a system
  with gcc and binutils devel, running either 64 bits mode, big endian
  mode or another abi are also welcome, so that I can test all
  alternatives before considering it done
o How to detect cpu features, preferably without causing signals/traps,
  because I use attribute constructor on a function, but currently
  only functional for x86. What is desirable to detect is if, or which
  mips32 release 2 opcodes are implemented, or which mips32 opcodes
  are missing (in the mips manual, it says movf and movt are mips32
  but are not implemented in my sample for example)
o This one is kinda funny, as I am working on generating code, I am
  still not very familiar with the actual assembler syntax, so,
  what would be the proper __asm__ __volatile__ to flush the code
  cache of a buffer recently written? (I am making a call to _cache_flush
  on linux, and just mprotect otherwise, but it may require a different
  approach on other system).


> Thanks again for the help from Mark.
>
> Regards,
> Qi
> --
>  LIU Qi
>
>  liuqi at loongson.cn
>  liuqi82 at gmail.com
>
>  Loongson Technology Co. Ltd.
>
>  PGP Key fingerprint:
>   3D29 FDFD AFB3 225D B744
>   7FAB 51C7 4820 63BA 272F

Many thanks for any help, and sorry again for the somewhat off topic
post.

Paulo