linaro-toolchain November 2018

linaro-toolchain@lists.linaro.org

11 participants
39 discussions

New IRC Channel for Linaro Toolchain Working Group

by Matthew Gretton-Dann

All, During Connect the suggestion was made that each working group should have its own IRC Channel for discussions and topics relating to the group in particular (as opposed to #linaro which is 'generic' Linaro conversations). Therefore I have just set up #linaro-tcwg on Freenode for the Toolchain Working Group. This channel is public and open to anyone who wants to talk with the TCWG group about anything toolchain related. Thanks, Matt -- Matthew Gretton-Dann Toolchain Working Group, Linaro

3 years, 4 months

[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

5 years, 11 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

5 years, 11 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

5 years, 11 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

5 years, 11 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

5 years, 11 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

5 years, 11 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/

5 years, 12 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.

5 years, 12 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~

5 years, 12 months

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linaro-toolchain November 2018