VM-beginners

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179 discussions

A couple of vm beginner questions
by Philip Bernhart 06 May '19

06 May '19

Hi, I have a bunch of "beginner"(?) questions: 1. How to ensure that my local "stable" build from "stable" sources corresponds to the "stable" vm binary published on squeak.org? For example some time ago I build from the stable tag 201807260206 (= commit d1f3fb1c76ad72155d3becc8f9bed7d70e9485a9) which resulted in a VM which somehow had some weird and hard to understand issues with numbers corresponding in blaming the running smalltalk implementation in my case cuis: https://github.com/Cuis-Smalltalk/Cuis-Smalltalk-Dev/issues/145 2. How to build the VM for a platform which has the dietlibc or a different implementation of the standard C library? I once tried to build it on alpine linux so to get a minimal and small baseimage of it running to be able to use it in within Docker containers without waiting 30 minutes for the build, because of added sizes and complexities when relying on a more "standard" base linux system (*cough* ubuntu *cough*). 3. What is now the supposed "best practice" of adding functionality to squeak? Say I want to add to it support for password hashing using libsodium and the library blocks the VM when trying to do more elaborate calls, so an async call would be much less of a pain from the user perspective. So async calling in a FFI library of that code or moving that into a VM plugin so it's much wider supported? 4. How to specialized VMs for special use cases? Like for example I would want to build the VM for some architectures where there is no binary around and which don't like or support any JIT implementation. How do I correctly select the VM, configure and build it and also can ensure that it works? That's probably already too much to be answered in one mail. Thanks, Philip

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Porting the vm to arm aarch64
by Philip Bernhart 25 Feb '19

25 Feb '19

Hi, I tried recently to compile the VM on a pine64, which is a 64bit ARM variant. I stumbled over that autoconf couldn't find the platform type an issue which I'm investigating. Anyway some suggestions regarding getting the VM running on a slightly different platform would be nice. Thanks, Philip

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Re: [Vm-beginners] Steps toward aarch64 Cog
by ken.dickey＠whidbey.com 23 Dec '18

23 Dec '18

Greetings, Made the mistake of running the FFI unit tests in Cuis, which directly led me down the rabbit hole. Think I have made some progress in understanding, but don't yet see how to teach VMMaker to get code from register. Here is crux of one of my investigations: ============================== ===== C source ======sqFFITestFuncs.c /* test passing and returning doubles */ EXPORT(double) ffiTestDoubles(double d1, double d2) { printf("The two floats are %f and %f\n", (float)d1, (float)d2); return d1+d2; } ===== ASM === from objectdump -d 0000000000000ac0 <ffiTestDoubles>: ac0: a9be7bfd stp x29, x30, [sp, #-32]! ac4: 90000000 adrp x0, 0 <ffiTestChars> ac8: 91000000 add x0, x0, #0x0 acc: 910003fd mov x29, sp ad0: 6d0127e8 stp d8, d9, [sp, #16] ad4: 1e604009 fmov d9, d0 ad8: 1e604028 fmov d8, d1 adc: 1e624000 fcvt s0, d0 ae0: 1e624021 fcvt s1, d1 ae4: 1e22c000 fcvt d0, s0 ae8: 1e22c021 fcvt d1, s1 aec: 94000000 bl 0 <printf> af0: 1e682920 fadd d0, d9, d8 af4: 6d4127e8 ldp d8, d9, [sp, #16] af8: a8c27bfd ldp x29, x30, [sp], #32 afc: d65f03c0 ret // result returned in d0 (NB: _not_ x0) =================Cuis Workspace (after FFI unit test)=========== FFITestLibrary ffiTestDoubles: 30.0 with: 65.0. "--> 00.00558872584952 -- should be 95.0" =================Terminal Output=================================== The two floats are 30.000000 and 65.000000 =================================================================== FFIPlugin>>ffiCreateReturnOop: retVal ... ^interpreterProxy floatObjectOf: (self ffiReturnFloatValue). ==================================================================== My theory: return value taken from x0, not d0.==============================================Is this a sensible interpretation?Any hints from Heloise? Thanks much,-KenDPS: Merry Christmas! (I would use Xmas, but who knows what is lurking under the X? 8^)

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VMMaker assert failure
by Ken.Dickey 16 Dec '18

16 Dec '18

Greetings, I am using VMMaker on RasPi3 Raspian 32 bit. I have built the gdbarm32 debugger plugin and am trying to generate the VM source code. I hit an assert because #'strcpy:_:' numArgs. --> -1 I notice that in Cuis, #'strcpy:_:' numArgs. --> 2 Perhaps a recent change in #Character>>isLetter ..?? Changing the test in #String>>numArgs so that $_ is allowed in place of letters allows codegen to complete. Am I doing the right thing here? Thanks much, -KenD

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aarch64 Linux squeak-vm
by Ken.Dickey 13 Dec '18

13 Dec '18

I have built a stack-spur-vm from git sources on LePotato (Armbian) Raspberry Pi 3 (ArchLinuxArm) and Samsung Chromebook Plus (Linux under ChromeOS) In all cases, the code built fine and the resulting VM ran both Squeak and Cuis spur images. Many thanks to all! -KenD

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aarch64
by Ken.Dickey 11 Dec '18

11 Dec '18

Keeping to the simplest thing that works. The diffs/patches are applied to platforms/unix/vm and /config. Builds and works on LePotato Armbian with Cuis 5.0 Builds and works on RasPi3 ArchLinuxArm with Cuis 5.0 & Squeak 5.2 Test runner results: >> Squeak 5.2 #18229 2514 run, 4395 passes, 39 expected failures, 77 failures, 3 errors >> Cuis 5.0 #3485 with all standard packages loaded 1046 run, 957 passws, 66 failed, 23 errors [+ one SqueakSSLTest hung] I have not tested anything else. I think the attached code diffs are small enough that someone out there with access to the GIT tree could fold in the changes. Please let me know when the GIT tree is updated (I can test again) and what else I should do. Cheers, -KenD

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aarch64 stack spur progress
by ken.dickey＠whidbey.com 10 Dec '18

10 Dec '18

Small progress. I now have a squeak which runs spur format images on arm64 with only 64 bit libs: sqstkspur64linuxht/lib/squeak/5.0-20181206231/* This is a proof of concept, as I hacked several files to get here, basically for null cases. In particular, I have a custom "mvm" which sets opts -D__arm64__ -D__ARM_ARCH_8A__ and TARGET_ARCH="-march=armv8-a" which are used in "sqUnixMain.c" and "sqUnixHeartbeat.c" And of course I added a trivial case to config.guess aarch64:Linux:*:*) echo ${UNAME_MACHINE}-unknown-linux-gnu exit 0 ;; This compiled and ran OK on LePotato (AML-S905X-CC) soc, tested with Cuis5.0-3485.image. Armbian:aarch64:~ >>> uname -a Linux spud 4.14.70-meson64 #269 SMP PREEMPT Wed Sep 19 11:21:29 CEST 2018 aarch64 GNU/Linux How do I make this regular/harmless? What testing? ... I was thinking perhaps the "mvm" in oscogvm/build.linux64x64/squeak.stack.spur/buildARM64/ Thanks again, -KenD

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aarch64 squeak-vm
by ken.dickey＠whidbey.com 08 Dec '18

08 Dec '18

To recap, I was able to build the older Debian package (4.10.2.2614) and, with a simple addition to config.guess, the Squeak.Org vm (4.16.5-3765) under aarch64 Armbian Linux. This withOUT 32 bit libs. I have started down the trail toward oscogvm/build.linux64x64/squeak.stack.spur. The build/mvm file has x86 flags ("TARGET_ARCH=-m64" "-msse2"), and I need to set a number of flags, based on email with Tim (Thanks!) to set __arm64__ and ARM64 and adjust sqUnixMain.c for aarch64. Given that I have not done C/Bash/Make for a couple of decades, any help in deciding where these flags are set and which of the 4736 gcc flags need to be set would be most welcome. The "-march=native" flag certainly won't do for a cross-platform build. So the proximate bits I see are [1] what flags should be set in mvm (cross-plartform) [2] what flags set in config.guess [3] what aarch specifics are needed in sqUnixMain.c (and possibly platform/unix/vm/include_ucontext,h) After that, of course, is squeak.cog.spur and relearning gdb, sigh. Just muddling through, -KenD > ----- Original Message ----- > > From: "Eliot Miranda" <eliot.miranda(a)gmail.com> > > To:<Ken.Dickey(a)whidbey.com> > > Cc: > > Sent:Thu, 6 Dec 2018 06:27:34 -0800 > > Subject:Re: [Vm-dev] [Vm-beginners] aarch64 squeak-vm > > Hi Ken, > > I just subscribed to the list. Could you send your message again, > specifying what exactly you want help with (understanding what’s going > on, how to find the set if predefined macros on your system, where to > look for the relevant definitions, etc)? Then I’ll respond. > > Cheers > _,,,^..^,,,_ (phone) > Eliot

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ioHighResClock
by Ken.Dickey 08 Dec '18

08 Dec '18

With the obvious preceding hacks, I now get unix/vm/sqUnixHeartbeat.o:190:3: #error "no high res clock defined" What is the recommended fix/workaround? Thkx, -KenD

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mcontext_t et al
by Ken.Dickey 08 Dec '18

08 Dec '18

Greetings, I am grepping around to find the source of ..In function sqUnixMain.c: In function 'sigsegv': include_ucontext.h:48:37: error 'mcontext_t' has no member 'arm_pc' I note in /usr/include/aarch64_linux_gnu/asm/sigcontext.h member 'pc' but not 'arm_pc' I am guessing this is from the include_ucontext.h line #elif __linux__ && __arm__ Where do I set/override __arm__ with (__aarch64__ or __armv8-a__ or __arm64__) ? What is the preferred __*__ to use? Any way to debug this cr*p? Trace flag? Dump defines (here)? Thanks much, -KenD

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