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[ACTIVITY] Weekly report for weeks 47 & 48

by Thomas Preudhomme

=== Work done during the past 2 weeks === * GNU-296 (Fix stack protector on ARM): committed! * LLVM-432 (Support arithmetic on FileCheck regex variable): + finished reworking parsing code to be separate from evaluation and support more complex expression + fix compile errors and bugs found when running tests added to check feature * Write patch to diagnose error when compiling Armv8-M Baseline CMSE code with -mfpu -> as unintended consequence, needs rewrite * Wrote and committed patch to improve comments for some data structure in ld * Misc: + various meeting about my departure from Arm & Linaro === Plan for week 49 === LLVM-432 (Support arithmetic on FileCheck regex variable): + extend testcase coverage (add tests for latest syntax change and add more negative testing) + clean up the code + improve documentation * Try to reproduce perf issue mentioned in week #30's weekly report on latest perf * Line management: + continue progress on rotations

6 years, 7 months

[ACTIVITY] 26-30 November 2018

by Christophe Lyon

== Progress == * FDPIC - GCC: no feedback yet on v4 patches - GDB: started looking at the patches, some parts are very similar to FRV, maybe worth commonalization. * GCC upstream validation: - reported a few regressions, helped testing some patches - dealing with some random results, still - trying qemu-3.1.0-rc1, memory consumption problems with aarch64-linux. Could not properly test cortex-m0 support yet, because building gcc --with-cpu=cortex-m0 currently fails. * GCC: - bug report on aarch64 about misaligned accesses. I do not have access to LHG gerrit, Maxim will look at isolating the problem. - rebased ubsan / bare-metal patches. Really need to look at how to merge them into LLVM * misc (conf-calls, meetings, emails, ....) - reviewing infra script patches - ran Spec2006 on aarch64 using gcc-8.2 sysroot, results match the previous ones, so the improvements are only imputable to the compiler. Started the same experiment on aarch32 - some Jira/goals discussions - dealing with nasty ST-internal infrastructure problems == Next == FDPIC: - GCC: handle feedback on v4 patches - GDB: update patches - uclibc-ng: look at how to test fdpic mode with openadk Benchmarks: - collect results Validation: - isolate why qemu-3.1.0-rc1 consumes much more memory for aarch64-linux target

6 years, 7 months

[ACTIVITY] report week ending 30 Nov

by Peter Maydell

Progress: * VIRT-65 [QEMU upstream maintainership] - release work (it is looking like we'll need an rc4 next week) - worked out some patches which hopefully will fix running QEMU on OSX Mojave (testing still required) - code review - sent a cleanup patchset that removes the load_image() function (which is not possible to use safely and which we marked as deprecated way back in 2008!) * VIRT-268 [QEMU support for dual-core Cortex-M Musca board] - implemented test case which demonstrates that we incorrectly share translated code between heterogenous CPUs and behave wrongly as a result (using the existing xlnx-zcu102 board) thanks -- PMM

6 years, 7 months

[ACTIVITY] week ending 30th November 2018

by Peter Smith

[LLVM-493] LLD link failure on KASLR for AArch64 Linux kernel The linux kernel can build in an ASLR mode that is currently causing LLD some problems. There are a few oddities in the kernel that aren't quite right but there are some problems in LLD that need resolving as well. has been a couple of interesting days trying to work out why some strange options have been used. [LLVM-484] LLD combination of dynamic relocs into a single section Committed upstream [LLVM-486] Error if user code defines _GLOBAL_OFFSET_TABLE_ Committed upstream [LLVM-489] Measure (cross) linking of performance of LLD on Chrome Performance of linking AArch64 matches X86, roughly twice as fast as ld.gold and five times faster than ld.bfd. [TCWG-1492] Investigated why git-clone and git-fetch might hang/deadlock. Back up might be to put a timeout/retry. [Other] Submitted LLVM team goals for the TCWG team Wrote up how TCWG use Jenkins and CI, now in Confluence. Planned Absences: ARM internal Compiler conference 4th/5th December Christmas holiday 17th December - 4th January

6 years, 7 months

[ACTIVITY] week ending Dec. 2 2018

by Alex Bennée

QEMU Tooling ([VIRT-252]) ========================= QEMU plugin support ([VIRT-280]) - reviewed Emilio's {RFC 00/48} Plugin support Message-Id: <20181025172057.20414-1-cota(a)braap.org> - looks like a good basis for going forward if we can work out the kinks - port my example tools to his framework :todo [VIRT-280] https://projects.linaro.org/browse/VIRT-280 Upstream Work ([VIRT-109]) ========================== - did a quick pass at [enabling system tests in check-tcg] - started reviewing {Qemu-devel} {PATCH for-4.0 v2 00/37} tcg: Assorted cleanups Message-Id: <20181123144558.5048-1-richard.henderson(a)linaro.org> [VIRT-109] https://projects.linaro.org/browse/VIRT-109 [enabling system tests in check-tcg] https://github.com/stsquad/qemu/tree/tests/enable-system-tests Testing and CI ============== [VIRT-2] https://projects.linaro.org/browse/VIRT-2 KVM CI Loop ([VIRT-2]) - The [LKFT team] are working with gregkh to ensure -stable is tested for KVM regressions - wrote up the State of testing for KVM Message-Id: <874lc14194.fsf(a)linaro.org> - look at example regression to see what would have caught the failure :todo - look at kselftest and understand it's place :todo [VIRT-2] https://projects.linaro.org/browse/VIRT-2 [LKFT team] https://lkft.linaro.org/ Other Tasks =========== - need to concluded actions from The QEMU initiative thread Message-Id: <87wop4gezg.fsf(a)linaro.org> :todo Completed Reviews [2/2] ======================= {RFC 00/48} Plugin support Message-Id: <20181025172057.20414-1-cota(a)braap.org> - CLOSING NOTE [2018-11-28 Wed 14:13] Hashed out a number of things. Emilio will look at a single-pass option and it makes things easier or not. It was also suggested we could move instruction fetch to helpers outside of the individual front-ends to keep the plugin call points in the core translator and avoid having to tweak each front-end for support. A number of pre-requisites were discussed including some de-macrofication work to make the code easier to follow and instrument. {PATCH 0/4} xxhash patches for 4.0 Message-Id: <20181123230206.12629-1-cota(a)braap.org> - CLOSING NOTE [2018-11-28 Wed 15:09] Clean-up to xxhash to match original and handle expanded hashes Absences ======== - Christmas Holidays - Connect BKK19 (1-5th April 2019) Current Review Queue ==================== * {Qemu-devel} {PATCH for-4.0 v2 00/37} tcg: Assorted cleanups Message-Id: <20181123144558.5048-1-richard.henderson(a)linaro.org> * {PATCH v6 00/13} hardfloat Message-Id: <20181124235553.17371-1-cota(a)braap.org> * {Qemu-arm} {PATCH v7 00/16} gdbstub: support for the multiprocess extension Message-Id: <20181123091729.29921-1-luc.michel(a)greensocs.com> * {Qemu-arm} {PATCH 00/13} Support disabling TCG on ARM Message-Id: <20181113165247.4806-1-sameo(a)linux.intel.com> * {PATCH 0/7} Acceptance Tests: basic architecture support Message-Id: <20181004151429.7232-1-crosa(a)redhat.com> * {PATCH v7 00/19} Fixing record/replay and adding reverse debugging Message-Id: <20181010133333.24538.53169.stgit@pasha-VirtualBox> -- Alex Bennée

6 years, 7 months

[ACTIVITY] 26 - 30 November 2018

by Prathamesh Kulkarni

== This Week == * GCC SVE ACLE (8/10) - Implementing svlsl intrinsics. * Validation (1/10) - TCWG-1494: Move email logic from tcwg_kernel.yaml to tcwg_kernel-bisect.sh * Misc (1/10) - Meetings == Next Week == - Address Richard's comments on svlsl patch - TCWG-1494 - Experiment with hcqc - Investigate milc regression in gcc-8

6 years, 7 months

[ANNOUNCE] Arm Binary A-profile Toolchain Release GCC 8.2-2018.11

by Przemyslaw Wirkus

The Arm GNU Toolchain for the A-profile Architecture ===================================================== The Arm GNU Toolchain for the A-profile Architecture 8.2-2018.11 Release is now available. Arm is pleased to announce the first Arm-built release of the pre-built GNU cross-toolchain for the A-profile cores: GCC 8.2-2018.11. This is the same toolchain that was previously built and distributed by Linaro. For the official announcement, see: https://community.arm.com/tools/b/blog/posts/pre-built-gnu8-cross-toolchain… For more information about the GNU Arm toolchain and to download the release packages, see the Arm Developer website at: https://developer.arm.com/open-source/gnu-toolchain/gnu-a For an explanation of FSF GCC 8 series changes see: https://gcc.gnu.org/gcc-8/changes.html For help in porting to GCC 8 see the following explanation: https://gcc.gnu.org/gcc-8/porting_to.html Download the release packages from: (sources) https://developer.arm.com/open-source/gnu-toolchain/gnu-a/downloads (binaries) https://developer.arm.com/open-source/gnu-toolchain/gnu-a/downloads Previous snapshots and release-candidates for GCC 7 and earlier are at: (sources) https://releases.linaro.org/components/toolchain/gcc-linaro/ (binaries) http://snapshots.linaro.org/components/toolchain/binaries/ Previous releases for GCC 7 and earlier are at: http://releases.linaro.org/components/toolchain/binaries/ A description of the Arm and AArch64 target triples can be found at: https://collaborate.linaro.org/display/TCWGPUB/ARM+and+AArch64+Target+Tripl… Host Requirements ================== * Ubuntu 14.04 LTS x86_64 or later or RHEL 6.9 x86_64: * x86_64 hosted cross compiler for AArch64 ELF bare-metal target (x86_64-aarch64-elf). * x86_64 hosted cross compiler for AArch64 ELF bare-metal, big-endian target (x86_64-aarch64_be-elf). * x86_64 hosted cross compiler for AArch64 GNU/Linux target (x86_64-aarch64-linux-gnu). * x86_64 hosted cross compiler for AArch64 GNU/Linux big-endian target (x86_64-aarch64_be-linux-gnu). * x86_64 hosted cross compiler for AArch32 bare-metal target (x86_64-arm-eabi). * x86_64 hosted cross compiler for AArch32 target with soft float (x86_64-arm-linux-gnueabi). * x86_64 hosted cross compiler for AArch32 target with hard float (x86_64-arm-linux-gnueabihf). * Windows 7 or later, for 32 and 64 bit OS: * i686-mingw32 hosted cross compiler for AArch32 bare-metal target (i686-mingw32-arm-eabi). * i686-mingw32 hosted cross compiler for AArch64 ELF bare-metal target (i686-mingw32-aarch64-elf). Package Versions ================= GCC 8.2.1 https://gcc.gnu.org/gcc-8/changes.html FSF glibc 2.28 http://lists.gnu.org/archive/html/info-gnu/2018-08/msg00000.html Newlib 3.0.0 https://sourceware.org/ml/newlib/2018/msg00019.html GNU Binutils 2.30 https://lists.gnu.org/archive/html/info-gnu/2018-01/msg00010.html FSF GDB 8.1.1 https://www.gnu.org/software/gdb/download/ANNOUNCEMENT libiconv 1.15 https://savannah.gnu.org/forum/forum.php?forum_id=8790 libexpat 2.2.5 https://github.com/libexpat/libexpat/blob/R_2_2_5/expat/Changes libgmp 4.3.2 libisl 0.15 libmpfr 3.1.6 libmpc 0.8.2 Sources provided in release source tar ball. News for GCC 8 (as of GCC 8.2-2018.11) ======================================= * Bug-fix of "Mingw32 version of GCC 8.2 for ARM Cortex-A family fails to compile with option '-mabi=ilp32'". https://bugs.linaro.org/show_bug.cgi?id=4020 * No other changes between this release and GCC 8.2-2018.08. For more details about Spectre V1 defense in GCC visit: https://lwn.net/Articles/759423/ Contact Arm ============ For any questions, please use the Arm Communities forums at: https://community.arm.com/tools/ Please report any bugs via the Linaro Bugzilla at: https://bugs.linaro.org/

6 years, 7 months

[ACTIVITY] Week 46

by Yvan Roux

o 4 days week. o LLVM * 7.0.1-rc2: - Miscompare on AArch64 is related to host compiler, still digging. * Machine Outliner on ARM prototype: - IR Outliner experiments: Commented upstream, and reducing problematic test case. o Misc * Various meetings and discussions.

6 years, 7 months

[ACTIVITY] week ending 25 Nov 2018

by Richard Henderson

Four day week (Happy Thanksgiving, all you Europeans) [Upstream] Posted patches making bswap during qemu_ld/st optional. The prompt was reviewing the tcg/riscv/ patch set, but I've wanted to do this for ages. This should avoid the need for reservation of scratch registers on some hosts that can ill afford it -- in particular i386 and aa32. In the process I ran into two other places that x86 used those scratch registers: stores from non-q-registers and bsd-user. I included patches for both of those (freebsd only; net/openbsd will work so long as guest_base == 0 and will abort at runtime otherwise). I still need to audit the other hosts before dropping the call-clobbering from user-only within tcg.c. r~

6 years, 7 months

[ACTIVITY] 19-23 November 2018

by Christophe Lyon

== Progress == * FDPIC - Cortex-M uClibc-ng patch merged - GCC: no feedback yet on v4 patches * GCC upstream validation: - reported a few regressions - dealing with some random results, again - trying qemu-3.1.0-rc1, maybe some memory consumption problems, tbc * GCC: - bug report on aarch64 about misaligned accesses. I do not have access to LHG gerrit, Maxim will look at isolating the problem. - rebased ubsan / bare-metal patches. Really need to look at how to merge them into LLVM * misc (conf-calls, meetings, emails, ....) - reviewing infra script patches - ran Spec2006 using gcc-8.2 sysroot, to avoid differences caused by glibc versions. Fortran benchmarks could not run when compiled with gcc-5/gcc-6 because libgfortran changed .so version compared to gcc-8. == Next == FDPIC: - GCC: handle feedback on v4 patches - uclibc-ng: look at how to test fdpic mode with openadk Benchmarks: - collect results Validation: - check if qemu-3.1.0-rc1 is OK for my GCC validations

6 years, 7 months

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