[Vm-dev] Cog/Stack VM on PowerPC?

Eliot Miranda eliot.miranda at gmail.com
Thu May 15 18:07:42 UTC 2014


On Thu, May 15, 2014 at 10:04 AM, Douglas McPherson <djm1329 at san.rr.com>wrote:

>
> Yes, I tried with -O0, but to no avail. I'm still unable to open any
> image. I'm sure it's one of these compiler flags that I'm missing or have
> got wrong, but I'm afraid I don't understand what many of them do :(
>
> Any suggestions on how to proceed would be most welcome!
>

gdb.  Plus -sendtrace (I think) can print out messages (slow) that can
help.  In gdb you can run and then interrupt to see where it is stuck.


>
> Thanks,
> Doug
>
>
> On May 14, 2014, at 10:15 , John McIntosh wrote:
>
> Did you try it with -O0
>
>
>
> On Wed, May 14, 2014 at 9:16 AM, Douglas McPherson <djm1329 at san.rr.com>wrote:
>
>>
>> Here is the crash log hoping that someone can spot something obvious :)
>>
>>
>>
>> On May 14, 2014, at 08:42 , Douglas McPherson wrote:
>>
>>
>> On May 12, 2014, at 22:04 , Eliot Miranda wrote:
>>
>> Hi Doug,
>>
>>
>> On Mon, May 12, 2014 at 9:27 PM, Douglas McPherson <djm1329 at san.rr.com>wrote:
>>
>>>
>>> Thank you both John and Eliot,
>>>
>>> Yes that was the problem ... I changed the architecture setting in the
>>> CoreVM project, but I (also?) needed to make the change for the Squeak
>>> target.
>>>
>>> Now that I'm building for the right architecture, there are several
>>> compile errors ... mostly atomic operation macros not yet defined for PPC.
>>>  Also an error due to no high res clock defined :(
>>>
>>
>> Never mind.  Just do without.  I know that requires some trickery, but...
>>
>>
>> Ok, after some mostly blind hacking (especially with regard to choosing
>> compile flags) I managed to compile. Of course it won't open an image
>> though :) I tried both a 4.5 image and a 4.1 image.  Does anyone have have
>> experience with StackVM on PPC?
>>
>>
>>
>>
>>>
>>> My actual goal for this effort is to try to fill in the pieces of the
>>> ThreadedPPCBEFFIPlugin, mostly as an academic exercise.
>>>
>>
>>
>> That's fab.  I want to dangle a PowerPC JIT as an academic exercise too
>> ;-).
>>
>>
>> Yes, that would be a cool longer-term exercise!
>>
>> But we need to talk over the PPC, because there's a gotcher with it.
>>  basically the register parameters are shadowed on the stack, so while
>> marshalling (while computing the values to pass) one can't "just call" a
>> marshalling routine (say to convert a LargeInteger to a parameter), because
>> doing so would trash the stack.  Instead one has to alloca additional space
>> for marshalling calls and then throw it away by cutting back the stack just
>> before the actual call.  What I've just said probably makes as much sense
>> as Mary Poppins lyrics so we'll probably need to talk it through.
>>
>>
>>
>>
>> Yes, I think I saw #registerArgsSlop used for this purpose, right?
>>
>>
>>> Doug
>>>
>>>
>>> On May 12, 2014, at 11:01 , John McIntosh wrote:
>>>
>>> It might be defaulting to build intel architecture. Check the build
>>> parms to see if it is building a fat binary of power pc and intel
>>> instructions.  You can use the os-x cmd lipo to confirm you have both
>>> architectures in the build.
>>>
>>>
>>> On Mon, May 12, 2014 at 10:16 AM, Douglas McPherson <djm1329 at san.rr.com>wrote:
>>>
>>>>
>>>> Yesterday I spent several hours resurrecting an old PowerMac G4 running
>>>> OS X 10.5 (Leopard). I managed to find Xcode 3.1.4 download on Apple's
>>>> developer site and install it. I want to build a Cog/Stack VM for this
>>>> machine. I opened the xcode project in
>>>> Cog/stackbuild/macbuild/CoreVM.xcodeproj and built with no problems.
>>>> However the VM won't start instead popping up "You can't open the
>>>> application "Squeak" because it is not supported on this architecture."
>>>> This is the same message I get if I try to open the Squeak-4.5-All-in-One
>>>> on the G4 - which in that case makes sense since it's a full Cog VM built
>>>> for IA32 and of course doesn't run on PPC.
>>>>
>>>> So my questions are:
>>>> 1. Should I be able to run Cog/Stack on PPC?
>>>> 2. How should I build it? Clearly I'm doing something wrong.
>>>>
>>>> Thanks,
>>>> Doug
>>>>
>>>>
>>>
>>>
>>> --
>>>
>>> ===========================================================================
>>> John M. McIntosh <johnmci at smalltalkconsulting.com>
>>> Corporate Smalltalk Consulting Ltd. Twitter: squeaker68882
>>>
>>> ===========================================================================
>>>
>>>
>>>
>>>
>>
>>
>> --
>> best,
>> Eliot
>>
>>
>>
>>
>>
>
>
> --
> ===========================================================================
> John M. McIntosh <johnmci at smalltalkconsulting.com>
> Corporate Smalltalk Consulting Ltd. Twitter: squeaker68882
> ===========================================================================
>
>
>
>


-- 
best,
Eliot
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