Hi Michael,
take what I'm about to say with skepticism because I've not used the Android VM but as I understand it there is already a Cog Android VM for ARM v7 Androids. If you look at the HowToBuilds in opensmalltalk/vm's build.linux32ARMv6 & build.linux32ARMv7 you'll see
$ diff build.linux32ARMv*/HowToBuild 1c1 < How To Build On Linux ARMv6 (i.e. Raspbian for Raspberry Pi (*)) ---
How To Build On Linux ARM v7 (e.g. Android devices (*))
...
I'm pretty sure that the Rasperry Pi VM does crash on Android and vice verse, because of floating point issues. In the v6/RPi build we use CC="gcc -march=armv6 -mfpu=vfp -mfloat-abi=hard" and in the v7/Android build we use no such settings.
Right now there are only newspeak builds for Android (build.linux32ARMv7/{newspeak.cog.spur,newspeak.stack.spur}, but if you copy across build.linux32ARMv6/squeak.cog.spur and make the matching edits to the mvm files then you should have a working Android build. I'm cc'ing Ryan Macnak who is the person behind the New3speak Android VM. Ryan also did a MIPS back end so there's a possibility of running on those devices too.
I'm also pretty sure that this VM is missing the event-driven features of Andreas' VM and it would be great to have that folded back in.
On Fri, Jun 16, 2017 at 12:48 PM, Michael Rueger lists@andience.co.nz wrote:
Hi all,
long time no see :-)
Recently I spent a bit of time trying to piece together an Android VM using the up to date versions of AndroidStudio, SDK and NDK. Once things are building and running, I was planning to fold everything back into the proper build process.
Current (somewhat messy) state of things here https://github.com/mrueger42/st-android
It has been quite a long time since I looked at building VMs, so forgive me if I'm just being stupid here...
I was able to get the original port from Andreas to build and run, but it is a very outdated version. Still nice to have it as a piece of history, I think (AndroidVM in the above repo).
Some puzzle pieces later I have something running that is based on recent CogSpur opensmalltalk code and bits and pieces I found. Unfortunately CogSpur doesn't seem to play well with the setjmp/longjmp used in the code (CogDroid in the above repo).
Plus, the VM is running on the UI thread, not something that is viewed well on mobile. Actually it makes Android just kill the app if you block the UI thread for too long.
Trying to run the VM on a thread runs into a division by 0 exception (I think) and finds me way out of my league to track down why that would be. Crash below...
I haven't really tried getting Dmitry's version to build/work in a current environment, partly because I'm not sure I'm looking at the most up to date version (see below).
Any help, pointers, code snippets highly appreciated!
Cheers
Michael
P.S. Sending this to vm-dev and pharo-dev, but should probably send any followup to vm-dev?
list of sources I looked at:
-opensmalltalk -pharo
-original port by Andreas git@github.com:timfel/squeak-android-vm.git
-stack https://github.com/sbragagnolo/pharo-vm/
-dmitry gitorious is no longer, just an archival snapshot clicking on snapshot gives you the sources https://gitorious.org/cogvm/dmg-blessed?p=cogvm:dmg-blessed.git;a=summary non-functional jenkins setup https://ci.inria.fr/pharo-contribution/view/VM/job/CogDroid/ configure-readonly/
The Cog VM crash when running on a Thread:
D/jni-vm: Java_org_smalltalk_android_vm_VM_runVM D/jni-vm: runVM D/jni-vm: interpret
A/libc: Fatal signal 8 (SIGFPE), code -6, fault addr 0x67db in tid 26636 (Thread-5)
Revision: '6' ABI: 'arm' pid: 26587, tid: 26636, name: Thread-5 >>> org.smalltalk.android <<< signal 8 (SIGFPE), code -6 (SI_TKILL), fault addr 0x67db r0 00000000 r1 0000680c r2 00000008 r3 00000000 r4 e4f7f978 r5 00000008 r6 e4f7f920 r7 0000010c r8 e4f7ef60 r9 e3516400 sl e351648c fp e4f7ecb4 ip 00000002 sp e4f7ce30 lr efca84c7 pc efcaad30 cpsr 600e0010
backtrace: #00 pc 0004ad30 /system/lib/libc.so (tgkill+12) #01 pc 000484c3 /system/lib/libc.so (pthread_kill+34) #02 pc 0001dd99 /system/lib/libc.so (raise+10) #03 pc 000c54a3 /data/app/org.smalltalk.androi d-2/lib/arm/libStackVM.so #04 pc 00051507 /data/app/org.smalltalk.androi d-2/lib/arm/libStackVM.so #05 pc 0003d38b /data/app/org.smalltalk.android-2/lib/arm/libStackVM.so (interpret+238) #06 pc 000a4e6f /data/app/org.smalltalk.android-2/lib/arm/libStackVM.so (runVM+22) #07 pc 000a4a55 /data/app/org.smalltalk.android-2/lib/arm/libStackVM.so (Java_org_smalltalk_android_vm_VM_runVM+36) #08 pc 0031ec99 /data/app/org.smalltalk.android-2/oat/arm/base.odex (offset 0x302000)