[squeak-dev] [Vm-dev] Squeak5.3 linux ARMv6 segfaults on startup

Nicolas Cellier nicolas.cellier.aka.nice at gmail.com
Mon Mar 23 23:31:47 UTC 2020


Hmm, it looks like I broke the signedBitShift: by omission (I did not
update it, and it now calls updated bitShift:...)

[minY > lastY and:[fwDy >= 0]] whileTrue:[
lastX := lastX + ((fwDx + 16r8000) signedBitShift: -16).
lastY := lastY + ((fwDy + 16r8000) signedBitShift: -16).
fwDx := fwDx + (updateData at: GBUpdateDDX).
fwDy := fwDy + (updateData at: GBUpdateDDY).
].

==>

@@ -13423,8 +13423,8 @@ stepToNextBezier(void)
        minY = (workBuffer[GWCurrentY]) * 256;
        while ((minY > lastY)
         && (fwDy >= 0)) {
-               lastX += ((signed)(fwDx + 32768) >> 16);
-               lastY += ((signed)(fwDy + 32768) >> 16);
+               lastX += (((usqInt)((fwDx + 32768))) >> 16);
+               lastY += (((usqInt)((fwDy + 32768))) >> 16);
                fwDx += updateData[GBUpdateDDX];
                fwDy += updateData[GBUpdateDDY];
        }


Le lun. 23 mars 2020 à 23:33, Nicolas Cellier <
nicolas.cellier.aka.nice at gmail.com> a écrit :

> Hi all,
> I observe similar font problems on windows spur32 VM/image
>
> [image: image.png]
>
> Virtual Machine
> ---------------
> Open Smalltalk Cog[Spur] VM [CoInterpreterPrimitives
> VMMaker.oscog-eem.2731]
> Win32 built on Mar 23 2020 22:15:31 CET Compiler: 7.4.0
> platform sources revision VM: 202003220256 Date: Sat Mar 21 19:56:35 2020
> CommitHash: b85570231 Plugins: 202003220256
> CoInterpreter VMMaker.oscog-eem.2731 uuid:
> 3c8dda9e-4706-4c3d-8c58-a284c47f5705 Mar 23 2020
> StackToRegisterMappingCogit VMMaker.oscog-eem.2731 uuid:
> 3c8dda9e-4706-4c3d-8c58-a284c47f5705 Mar 23 2020
>
>
> Le dim. 22 mars 2020 à 22:50, Eliot Miranda <eliot.miranda at gmail.com> a
> écrit :
>
>> Hi Bruce,
>>
>>
>> On Mar 22, 2020, at 8:31 AM, Bruce O'Neel <bruce.oneel at pckswarms.ch>
>> wrote:
>>
>>
>> Hi,
>>
>> Good news, playing with
>>
>> --enable-fast-bitblt
>>
>>
>> and
>>
>> --disable-fast-bitblt
>>
>>
>> does work in that it builds a working VM.
>>
>> Good news/bad news, it does not change the font problem.  So that's not
>> the problem.
>>
>>
>> Great news.  We now know it is an X11 problem and can stop worrying about
>> the fast BitBLT code.  Thanks.
>>
>>
>> cheers
>>
>> bruce
>>
>> *21 March 2020 01:07 tim Rowledge <tim at rowledge.org <tim at rowledge.org>>
>> wrote:*
>>
>>
>>
>> > On 2020-03-20, at 6:16 AM, Bruce O'Neel wrote:
>> >
>> >
>> > I specialize in ridiculous. Good news, I guess, is that I dug up a
>> monitor, and, walked it downstairs with a keyboard and mouse and attached
>> it. The effect with the BitstreamVeraSans and ComicSans fonts are the same.
>> Maybe it likes serfed fonts?
>>
>> I'm completely baffled by this. I don't get this effect with any ARM vm
>> that I have that actually runs, with any image I have.
>>
>> >
>> > So that means that it is not some funky X11 over the wire problem with
>> the Mac and Windows X11 servers problem. That's good.
>>
>> Guess so, though it just makes life weirder.
>>
>> >
>> > I have no idea then why. Are these fonts part of the image? Is it some
>> funky binary format that for some reason Coq is mis-reading?
>>
>> Yes, the font glyphs are in-image. We've been using these ones for
>> goodness knows how many years.
>>
>> >
>> > I built a stack VM and I get the same result with a Squeak 5.3 image.
>>
>> There*shouldn't* be any difference between the stack & cog vms.
>>
>> You could try building a VM with the fastbitblt turned off I suppose -
>> a quick hack is to find the BITBLT_FLAGS= -DENABLE_FAST_BLT and related
>> lines in the Makefile in you squeak.cog.spur/build directory. I haven't
>> actually built an ARM vm without that in years so I don't know it it even
>> still works.
>>
>>
>> tim
>> --
>> tim Rowledge; tim at rowledge.org; http://www.rowledge.org/tim
>> It is easier to change the specification to fit the program than vice
>> versa.
>>
>>
>>
>>
>>
>>
>>
>>
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