VM-beginners December 2018

vm-beginners@lists.squeakfoundation.org

4 participants
10 discussions

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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Re: [Vm-beginners] aarch64 squeak-vm
by David T. Lewis 06 Dec '18

06 Dec '18

Ken, Thank you for the update to cmake/config.guess to add support for building the interpreter VM on aarch64. I committed your updates to the SVN repository. Dave On Tue, Dec 04, 2018 at 10:34:31PM +0000, Ken.Dickey wrote: > On Tue, 4 Dec 2018 09:16:08 -0500 > "David T. Lewis" <lewis(a)mail.msen.com> wrote: > > > Since you are able to compile this successfully, I would suggest one > > additional step. The Debian squeaka-vm package got to a pretty bad > > state (unfortunately), so you will have a much more up to date VM > > if you compile from the real squeakvm.org sources. Follow instructions > > at http://wiki.squeak.org/squeak/6354. > > > > This will give you a good VM for use up through Squeak 4.6, at which > > point the image format changes to Spur, and the oscog VMs are needed. > > Thanks. Dave. > > This build compiled and works on aarch64 Linux with version 4.16.5-3765 > > Modified config.guess attached. > > -- > -KenD

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aarch64 squeak-vm
by Ken.Dickey 04 Dec '18

04 Dec '18

Greetings, I have not done much in C for a couple of decades, so those bits have evaporated, but am taking a shot at getting squeak-vm(s) up on aarch64/arm64 Linux. The current Debian package runs in 64 bit mode on ARM and I have been able to build a working images from source on a Armbian/aarch64/Linux machine (LePotato/AML-S905X-CC). https://salsa.debian.org/pkg-sugar-team/squeak-vm with patches: https://salsa.debian.org/pkg-sugar-team/squeak-vm/tree/master/debian/patches This is a superannuated (2012?) squeak-vm-4.10.2.2614, but does run in 64 bit mode on ARM. So I have a proof of concept. Runs Cuis/Squeak fine (but slow). I "git cloned" oscogvm and added case aarch64:Linux:*:* to oscogvm/platforms/unix/config/config.guess But the C compiler (gcc) is getting confused by some x86 compile flags. I am running oscogvm/build.linux64x64/squeak.stack.spur/build/mvm [config.log attached]. The proximate cause is handing configure the flag "TARGET_ARCH=-m64", but it has been long enough that I have little idea where or how this script is processed. Can some kind soul help me get a bit further here? Thanks a bunch! -- -KenD

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VM-beginners December 2018