- linaro-toolchain - lists.linaro.org

[ACTIVITY] week ending 16 Dec 2018

by Richard Henderson

Progress: [VIRT-246 # ARMv8.1-LOR Limited Ordering Regions ] Merged to target-arm.next. [VIRT-294 # ARMv8.3-PAuth, Pointer Authentication ] Posted v2. Now booting Will's kernel, which properly detects and enables support. Once that gets to mainline I'll add the prctl to linux-user/. [VIRT-339 # ARMv8.5-BTI, Branch Target Identification ] Started. [VIRT-327 # Richard's upstream QEMU work ] Put the ool softmmu patch set on hold for now, as that is not clearly ready when development opens again. Rebased all of the other queued tcg patch sets around that. Generated pull request. r~

7 years, 8 months

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[ACTIVITY] report week ending Dec 14

by Peter Maydell

Progress: * VIRT-65 [QEMU upstream maintainership] - QEMU 3.1.0 finally released - sent out a couple of pull requests - some easy patches fixing more clang warnings about taking the address of a member in a packed struct - read through the Memory Tagging extension specification (and a bunch of arm-internal meetings etc this week) thanks -- PMM

7 years, 8 months

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[ACTIVITY] 10 - 14 December 2018

by Peter Smith

[TCWG-1492] Add timeout and retry to git fetches in Linaro ci infrastructure. [LLVM-505] LLD implement --pic-veneer for AArch32 linux kernel (pr39886) In upstream review [LLVM-509] Add support for v6m range extension thunks to LLD In upstream review pr34928 fixed undefined weak reference handling for AArch64 Spent quite a bit of time revisiting cross-compilation of compiler-rt after helping out on llvm-dev. Posted a review D55709 to improve the documentation. Planned Absences Next 3 weeks on Christmas holiday back Monday 7th January

7 years, 8 months

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[ACTIVITY] 10 - 14 December 2018

by Diana Picus

== Progress == GlobalISel support for Thumb2: # [LLVM-506] G_LOAD, G_STORE # [LLVM-500] G_ADD, G_SUB, G_MUL, G_AND, G_OR, G_XOR # [LLVM-516] G_SEXT, G_ZEXT, G_ANYEXT, G_TRUNC # G_INTTOPTR, G_PTRTOINT - Committed upstream # [LLVM-518] Support G_CONSTANT for Thumb - Started adding tests == Plan == # [LLVM-518] Support G_CONSTANT for Thumb

7 years, 8 months

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[ACTIVITY] 10-14 December 2018

by Christophe Lyon

== Progress == * FDPIC - (GNU-499) GCC: wait for feedback on v4 patches - (GNU-411) GDB: will try to keep as much as possible in common with frv * GCC upstream validation: - reported a few regressions, helped testing some patches - dealing with some random results, still - qemu-3.1.0-rc3, memory consumption: no time to really look at the problem. Unable to match time's figures with LSF's * GCC: - (GNU-99) rebased ubsan / bare-metal patches. Trying to build an LLVM toolchain to see how to properly apply my patches: still trying, thanks to Peter Smith for the support! * misc (conf-calls, meetings, emails, ....) - reviewing/submitted infra script patches - ran Spec2006 on aarch32 using gcc-8.2 sysroot, on cortex-a57, results match the previous ones, so the improvements are only imputable to the compiler. 1 regression on gobmk (created GNU-596 to look at this) - dealing with nasty ST-internal infrastructure problems - (GNU-141) noinit/persistent attributes: they are already supported by GCC for TI msp430. The patches are small, plus one libgloss patch. - (GNU-592): started improving benchmarking scripts == Next == FDPIC: - GCC: handle feedback on v4 patches - GDB: update patches - uclibc-ng: look at how to test fdpic mode with openadk Validation: - isolate if/why qemu-3.1.0-rc3 consumes more memory than 2.11 for aarch64-linux target Misc: GNU-592

7 years, 8 months

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[ANNOUNCE] Linaro Binary Toolchain Release-Candidate GCC 6.5-2018.12-rc1

by Mark Murray

[ANNOUNCE] Linaro Binary Toolchain Release-Candidate GCC 6.5-2018.12-rc1 The Linaro Binary Toolchain ============================ The Linaro GCC 6.5-2018.12-rc1 Release-Candidate is now available. The GCC 6 Release series has significant changes from the GCC 5 release series. For an explanation of the changes please see the following website: https://gcc.gnu.org/gcc-6/changes.html For help in porting to GCC 6 please see the following explanation: https://gcc.gnu.org/gcc-6/porting_to.html Download release-candidate packages from: (sources) http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.5-2018.12-rc1/ (binaries) http://snapshots.linaro.org/components/toolchain/binaries/6.5-2018.12-rc1/ Previous snapshots and release-candidates are at: http://snapshots.linaro.org/components/toolchain/binaries/ Previous releases 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 ================== Linaro officially supports the current and previous Ubuntu LTS releases (as of the time of this release). This does not mean that the toolchain will not work on other/older Linux distributions. See the following for the life-time of Ubuntu LTS releases. https://wiki.ubuntu.com/Releases The host system upon which the cross-compiler will run requires a minimum of glibc 2.14, because of API changes to glibc's memcpy API. https://bugs.linaro.org/show_bug.cgi?id=1869 Package Versions ================= Linaro GCC 6.5-2018.12-rc1 http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.5-2018.12-rc1/ Linaro glibc 2.23 (linaro/2.23/master) https://lists.gnu.org/archive/html/info-gnu/2016-02/msg00009.html Linaro newlib 2.4-2016.03 (linaro_2.4-branch) https://sourceware.org/ml/newlib/2016/msg00370.html Linaro binutils 2.27 (users/linaro/binutils-2_27-branch) https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;a=blob_plain;f=bin… Linaro GDB 8.2 (gdb-8.2-branch) https://lists.gnu.org/archive/html/info-gnu/2018-09/msg00001.html Linaro toolchain package git branches are hosted at: http://git.linaro.org/toolchain NEWS for GCC 6 (as of Linaro GCC 6.5-2018.12-rc1) ================================================== * Runtest and gdbserver are no longer installed in the toolchain bin/ directory. Binary releases no longer include runtest at all, and gdbserver is a target tool; it is now shipped in the sysroot under usr/bin/. LDTS case #2211: gdbserver and runtest in GCC binary release are in the wrong place or have the wrong name * Gdbserver is no longer linked statically, because this is currently unsupported. Linaro bugzilla #3344: gdbserver broken in Linaro 2017.02 https://bugs.linaro.org/show_bug.cgi?id=3344 * Previous MinGW hosted version of Linaro GCC C preprocessor failed to convert character set used for string, character constants, etc. This is fixed in this release. Linaro bugzilla #3040 : CC1 and cc1plus cannot convert UTF-8. https://bugs.linaro.org/show_bug.cgi?id=3040 * The Linaro GCC 6.3-2017.05 snapshot added support for -mpure-code option to ARMv7-M and ARMv8-M targets. This option ensures functions are put into sections that contain only code and no data. * The GDB version was upgraded from GDB 8.1 to 8.2. * Previous versions of the Linaro GCC 6 toolchain, when -static -E/—dynamic-list are passed to the linker, might create executables with dynamic sections which aren’t supported by run-time. This was exhibited in Perf Tools build system and has been fixed upstream and backported into Linaro Binutils 2.27 branch. Linaro bugzilla #2926 : Perf tools compiled statically for AArch64 with Linaro release 6.1 and later ones was not statically linked. https://bugs.linaro.org/show_bug.cgi?id=2926 * The Linaro GCC 6.3-2017.03 snapshot fixed some ILP32 issues (TLS, exception handling, …) and these have been incorporated into this release. * Previous versions of the Linaro GCC 6 toolchain were incorrectly generating floating-point code for soft-float Linux targets (arm-linux-gnueabi, and armeb-linux-gnueabi). This escaped detection until recently because the soft-float targeted toolchains were configured to use general-purpose registers for passing floating-point values (which is what you would expect for soft-float toolchains) and the intra-routine floating-code was not noticed. The issue would only show up on targets that were run on hardware that truly didn't have floating-point hardware where the kernel did not trap and emulate floating-point routines. This has been solved in Linaro GCC 6.3-2017.02-rc2 by configuring the toolchain (using --with-float=soft) to generate code without any floating-point instructions at all (-mfloat-abi=soft). https://review.linaro.org/#/c/16968/2 This change should not break compatibility between existing binaries compiled with these toolchains since the float-point parameter passing ABI is still the same. * A bug/regression in the compiler has been identified whereby the target function that is invoked when calling a "weak" function directly is the "strong" override, whereas when calling the function via a pointer the "weak" implementation is used. This would be noticed as inconsistent function invocation when invoking directly vs. invoking via function pointer. This issue only affected 32-bit arm targets. This regression has been fixed upstream and backported into Linaro GCC 6.3-2017.02-rc2. GCC PR target/78253: [5/6/7 Regression] [ARM] call weak function instead of strong when called through pointer. https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78253 Linaro bugzilla #2562: ARM GCC 5.2 call weak function instead of strong when called through pointer https://bugs.linaro.org/show_bug.cgi?id=2562 * MS Windows does not support symlinks and the MS Windows archive extractor does not properly deep copy the symlink target files/directories into the symlinked directory structure when unpacking the toolchain archive. This causes problems with missing dependencies when using the Linaro mingw toolchains, as identified in the following bugs: https://bugs.linaro.org/show_bug.cgi?id=2684 https://bugs.linaro.org/show_bug.cgi?id=2192 https://bugs.linaro.org/show_bug.cgi?id=2762 This has been solved by copying files rather than using symlinks when the mingw targetted toolchain archives are created. https://review.linaro.org/#/c/16415/ * Users of Linaro's toolchain have encountered problems when building projects with Autotools (specifically libtool): https://bugs.linaro.org/show_bug.cgi?id=2764 The Linaro binary toolchain release contained files with a .la suffix as artifacts of the toolchain build process. These .la files are helper files for libtool, but unlike a gcc install tree, they are not position independent and contain full paths. Since these artifacts contain absolute paths they can actually mislead user invocation of libtool into not finding required libraries (because they reference the build tree, not the install location) and hence breaking Autotools builds. These *.la file artifacts have been removed from Linaro toolchain binaries because they are unnecessary for users. * The Linaro GCC 6.3-2017.01 snapshot added further enablement for ARMv8-M and these have been incorporated into this release. * Compiling and statically linking some SPEC2006int tests against tcmalloc have been failing due to a problem with glibc's memory allocator function overrides. This was fixed upstream: https://sourceware.org/bugzilla/show_bug.cgi?id=20432 Backported into Linaro glibc 2.23: commit 058b5a41d56b9a8860dede14d97dd443792d064b Author: Florian Weimer <fweimer(a)redhat.com> Date: Fri Aug 26 22:40:27 2016 +0200 malloc: Simplify static malloc interposition [BZ #20432] * Host binaries for x86_64 linux hosts now have symbols and debug information stripped in order to reduce the size of the toolchain binary archives. This reduces the archive size from 1.5G to 600M for aarch64-linux-gnu target with the gcc-6-branch. * The GDB version was upgraded from GDB 7.11 in the Linaro GCC 6.1-2016.08 release to GDB 7.12 in the Linaro GCC 6.2-2016.11 release. * The Linaro GCC 6.2-2016.10 snapshot added AArch32 support for ARMv8.2 and ARMv8m, as well as some AArch64 fixes for ARMv8.2, and bug fixes merged from FSF GCC 6.2. This is available in the binary toolchain as of Linaro GCC 6.2-2016.11. * Basic tuning support for the Qualcomm qdf24xx was added to the Linaro GCC 6.2-2016.10 snapshot and is available in the binary toolchain as of Linaro GCC 6.2-2016.11. * IFUNC was disabled for baremetal targets, as it was causing test-suite failures, and is presently a Linux only feature. * The gold linker was added to this binary release. * Backported malloc_lock fix into Linaro newlib 2.4. commit 2665915cfc46aa6403bb2efd473c523d3167e0cb Author: Andre Vieira (lists) <Andre.SimoesDiasVieira(a)arm.com> Date: Thu Jun 16 12:23:51 2016 +0100 Re-enable malloc_lock for newlib-nano * Backported rawmemchr patch into Linaro newlib 2.4. commit e7b1ee2ea6aa3ee1da41976407410e6202a098c5 Author: Wilco Dijkstra <Wilco.Dijkstra(a)arm.com> Date: Thu May 12 16:16:58 2016 +0000 Add rawmemchr * Backported strlen fix when using Thumb-2 and -Os -marm into Linaro newlib 2.4. commit 5c02bcc086a96b174e1b9e1445a4a1770070107a Author: Thomas Preud'homme <thomas.preudhomme(a)arm.com> Date: Wed May 11 17:18:48 2016 -0400 Fix strlen using Thumb-2 with -Os -marm * Backported fix for semihosting ARM when heapinfo not provided by debugger into Linaro newlib 2.4. commit 5c9403eaf40951f8a4f55ed65f661b485ff44be7 Author: David Hoover <spm2(a)dangerous.li> Date: Thu Apr 21 07:12:24 2016 +0200 Fixed semihosting for ARM when heapinfo not provided by debugger. * Merged latest FSF glibc release/2.23/master into Linaro glibc 2.23. * Backported __ASSUME_REQUEUE_PI check Linaro glibc 2.23 branch. commit 2d20c3bf918cd94ebd4106693adb3a5c9272baba Author: Adhemerval Zanella <adhemerval.zanella(a)linaro.org> Date: Tue May 17 10:16:39 2016 -0300 Add runtime check for __ASSUME_REQUEUE_PI (BZ# 18463) * Backported removal of __ASSUME_SET_ROBUST_LIST from Linaro glibc 2.23 branch. commit bb8f09d72756186a3d82a1f7b2adcf8bc1fbaed1 Author: Adhemerval Zanella <adhemerval.zanella(a)linaro.org> Date: Mon May 16 19:01:10 2016 -0300 Remove __ASSUME_SET_ROBUST_LIST * Backported removal of __ASSUME_FUTEX_LOCK_PI from Linaro glibc 2.23 branch. commit e48b4e7fed0de06dd7832ead48bea8ebc813a204 Author: Adhemerval Zanella <adhemerval.zanella(a)linaro.org> Date: Mon May 16 10:35:25 2016 -0300 Remove __ASSUME_FUTEX_LOCK_PI * Merged latest FSF binutils-2_27-branch into linaro_binutils-2_27-branch. * The libwinpthread DLL is now copied into the host bin directory to satisfy mingw package dependencies. * Backported GNU Linker fix. commit fbc6c6763e70cb2376e2de990c7fc54c0ee44a59 Author: Nick Clifton <nickc(a)redhat.com> Date: Tue Aug 23 09:45:11 2016 +0100 Fix seg-fault in ARM linker when trying to parse a binary file. * Backported GNU Assembler fix for PR 20364 commit 5fe7ebe5ab43750abf8f490b785d99a1e598e7fd Author: Nick Clifton <nickc(a)redhat.com> Date: Fri Aug 5 10:37:57 2016 +0100 Fix the generation of alignment frags in code sections for AArch64. https://sourceware.org/bugzilla/show_bug.cgi?id=20364 * Performance related backports from the following snapshots have been included: Linaro GCC 6.1-2016.06, Linaro GCC 6.1-2016.07, Linaro GCC 6.1-2016.08, Linaro GCC 6.2-2016.09, Linaro GCC 6.2-2016.10, Linaro GCC 6.2-2016.11, Linaro GCC 6.2-2016.12, Linaro GCC 6.3-2017.01, Linaro GCC 6.3-2017.02, Linaro GCC 6.3-2017.03, Linaro GCC 6.3-2017.04, Linaro GCC 6.3-2017.05, Linaro GCC 6.3-2017.06, Linaro GCC 6.4-2017.07, Linaro GCC 6.4-2017.08, Linaro GCC 6.4-2017.09, Linaro GCC 6.4-2017.10, Linaro GCC 6.4-2018.04 and Linaro GCC 6.5-2018.11. See the following Linaro GCC snapshots: http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.1-2016.06/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.1-2016.07/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.1-2016.08/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.2-2016.09/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.2-2016.10/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.2-2016.11/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.2-2016.12/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.3-2017.01/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.3-2017.02/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.3-2017.03/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.3-2017.04/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.3-2017.05/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.3-2017.06/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.4-2017.07/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.4-2017.08/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.4-2017.09/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.4-2017.10/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.4-2018.04/ http://snapshots.linaro.org/components/toolchain/gcc-linaro/6.5-2018.11/ Contact Linaro =============== File bugs at http://bugs.linaro.org For Linaro member support see http://support.linaro.org For Linaro community support email linaro-toolchain(a)lists.linaro.org Mark Murray Staff Software Engineer | Arm . . . . . . . . . . . . . . . . . . . . . . . . . . . p: +44 1223 405082 arm.com <http://www.arm.com> IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. If you are not the intended recipient, please notify the sender immediately and do not disclose the contents to any other person, use it for any purpose, or store or copy the information in any medium. Thank you.

7 years, 8 months

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[ACTIVITY] Weekly report for week 49

by Thomas Preudhomme

=== Work done during last week === * DSGHACK-25 (Support arithmetic on FileCheck regex variable): + simplifies how numeric expression are matched and checked, easier to explain too + start code cleanup and increasing testing, ETA: end of next week * Line management. === Plan for week 50 === * DSGHACK-25 (Support arithmetic on FileCheck regex variable): + extend testcase coverage (add tests for latest syntax change and add more negative testing) + finish cleaning up the code + improve documentation * Try to reproduce perf issue mentioned in week #30's weekly report on latest perf * Line management

7 years, 8 months

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[ACTIVITY] Week 49

by Yvan Roux

o 4 days week. o LLVM * Machine Outliner on ARM prototype: - Rebased on upstream Machine Outliner developments - Still working on LLVM bootstrap failures in ARM mode o Misc * Various meetings and discussions.

7 years, 8 months

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[ACTIVITY] week ending 9 Dec 2018

by Richard Henderson

[VIRT-246 # ARMv8.1-LOR Limited Ordering Regions ] Posted v3. [VIRT-294 # ARMv8.3-PAuth, Pointer Authentication ] Implemented. Posted v1. I can sort of guarantee that it doesn't work in system mode yet, cause I spotted a bug by eye yesterday. In the meantime, Peter via Will Deacon added me to the cc list for the in development kernel patches. I'll review v5 shortly. r~

7 years, 8 months

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[ACTIVITY] week ending Dec. 9 2018

by Alex Bennée

Upstream Work ([VIRT-109]) ========================== - reviewed {Qemu-devel} {PATCH for-4.0 v2 00/37} tcg: Assorted cleanups Message-Id: <20181123144558.5048-1-richard.henderson(a)linaro.org> - looked at common part of {Qemu-devel} {PATCH 2 00/39} Windbg supporting Message-Id: <154401431697.8440.845616703562380651.stgit(a)Misha-PC.lan02.inno> - finished review of {PATCH v6 00/13} hardfloat Message-Id: <20181124235553.17371-1-cota(a)braap.org> - 2-3x speed-ups for FPU heavy workloads! - finished prototype of [enabling tcg system tests] - includes some more userspace tests as well - just missed posting RFC, will post next week [VIRT-109] https://projects.linaro.org/browse/VIRT-109 [enabling tcg system tests] https://github.com/stsquad/qemu/tree/testing/enable-system-tcg-tests-v1 Other Tasks =========== - debugged compiler failures on SynQuacer - turned out it was dodgy RAM *slot layout* - system now stable again - did some bug triage/tagging in QEMU bug database - update JIRA tickets as per QEMU initiative thread Message-Id: <87wop4gezg.fsf(a)linaro.org> :todo Completed Reviews [3/3] ======================= {PATCH v3 00/16} tcg: Assorted cleanups Message-Id: <20181130215221.20554-1-richard.henderson(a)linaro.org> - CLOSING NOTE [2018-12-03 Mon 10:46] Easier review with the re-org of removal and clean-up patches {Qemu-devel} {PATCH for-4.0 v2 00/37} tcg: Assorted cleanups Message-Id: <20181123144558.5048-1-richard.henderson(a)linaro.org> - CLOSING NOTE [2018-12-03 Mon 10:47] Got part way through, subset reposted and reviewed. Some questions remain on the efficiency of ool softmmu w.r.t various micro-architectures. {PATCH v6 00/13} hardfloat Message-Id: <20181124235553.17371-1-cota(a)braap.org> - CLOSING NOTE [2018-12-05 Wed 12:48] Looking good. I've proposed myself as another maintainer for FPU emulation and will handle the pull request once the tree opens. Absences ======== - Christmas Holidays - Connect BKK19 (1-5th April 2019) Current Review Queue ==================== * {RFC} arm: Allow system registers for KVM guests to be changed by QEMU code Message-Id: <20181206151401.13455-1-peter.maydell(a)linaro.org> * {Qemu-arm} {PATCH 00/13} Support disabling TCG on ARM Message-Id: <20181113165247.4806-1-sameo(a)linux.intel.com> * {PATCH for-4.0 0/5} tcg/i386: Improve guest_base handling Message-Id: <20181203160840.15115-1-richard.henderson(a)linaro.org> * {Qemu-devel} {PATCH for-4.0 00/71} qtest: qgraph driver framework Message-Id: <1543851204-41186-1-git-send-email-pbonzini(a)redhat.com> * {Qemu-arm} {PATCH v7 00/16} gdbstub: support for the multiprocess extension Message-Id: <20181123091729.29921-1-luc.michel(a)greensocs.com> * {PATCH 0/7} Acceptance Tests: basic architecture support Message-Id: <20181004151429.7232-1-crosa(a)redhat.com> -- Alex Bennée

7 years, 8 months

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[ACTIVITY] 3 - 7 December 2018

by Peter Smith

[LLVM-499] LLD support for linking the linux kernel - [LLVM-504] Support for linker script symbol assignment to an alias. -- Diagnosed problem and made reproducer on PR. -- Reviewed the upstream patch. - [LLVM-503] Support for discarding .dynamic, .dynstr and .dynsym -- Reviewed upstream patch and proposed testcase that is representative of the kernel use case. Some revisiting of scripts and advice on how to cross compile clang libraries. Looks like I have some updates to do to the documentation for some configurations I haven't tried before. - 2 days at ARM internal Codegen conference. Really good event, standard of work was very high, left enthused. Planned absences: Christmas Holiday from 17th December to 4th January

7 years, 8 months

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[ACTIVITY] 3-7 December 2018

by Christophe Lyon

== Progress == * FDPIC - GCC: no feedback yet on v4 patches - GDB: did not decide yet how/if to commonalize with frv code. Asked for advise on the gdb list. * GCC upstream validation: - reported a few regressions, helped testing some patches - dealing with some random results, still - trying qemu-3.1.0-rc3, memory consumption problems with aarch64-linux. LSF reports (cgroup-based) do not seem consistent with time --verbose. * GCC: - rebased ubsan / bare-metal patches. Trying to build an LLVM toolchain to see how to properly apply my patches * misc (conf-calls, meetings, emails, ....) - reviewing/submitted infra script patches - ran Spec2006 on aarch32 using gcc-8.2 sysroot, results match the previous ones, so the improvements are only imputable to the compiler. - dealing with nasty ST-internal infrastructure problems - trying to look at noinit/persistent attributes provided by other toolchains, need a windows machine :( == 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 if/why qemu-3.1.0-rc3 consumes more memory than 2.11 for aarch64-linux target

7 years, 8 months

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[ACTIVITY] report week ending 7 Dec

by Peter Maydell

Progress: * VIRT-65 [QEMU upstream maintainership] - release work (we needed an rc4, and then an rc5 due to a late-breaking security bug) - wrote a patch which I hope will fix synchronization of system register state to KVM for a case where QEMU code wants to change the register values, which it does when QEMU is arranging to inject an exception into the guest - catching up on patch review and assembling target-arm.next ready for when the tree reopens - some simple patches fixing minor memory leaks spotted by clang LeakSanitizer - sent a patch for a race condition that meant we would sometimes ignore a guest-requested system reset or otherwise get confused by it thanks -- PMM

7 years, 8 months

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[ACTIVITY] 3 - 7 December 2018

by Diana Picus

== Progress == # [LLVM-492] [Thumb GlobalISel] Lower parameters for Thumb functions - Committed upstream # [LLVM-500] [Thumb GlobalISel] Support G_ADD, G_SUB, G_MUL - Started working on this but it became apparent that the existing tests would be easier to reuse if we had support for G_LOAD first # [LLVM-506] [Thumb GlobalISel] Support G_LOAD and G_STORE - Investigated whether we could get TableGen to select G_LOADs and G_STOREs by porting ComplexPattern - Unfortunately that is not enough, and even AArch64 has hand-written code for it in the instruction selector - Will handle it the ugly way next week == Plan == # LLVM-506, LLVM-500

7 years, 8 months

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Aarch64 gcc does not optimize function when applied as function attribute

by Roger Cuypers

Greetings, I’m trying to have the Aarch64 gcc optimize a single function using the O3 optimization in this manner: void __attribute__ ((optimize ("-O3", "-ftree-vectorize" ))) However, when examining the assembler code, there is no trace of any optimization beyond the project default. The only way to successfully enforce the optimization is using -O3 in the gcc command line. Then the compiler produces ARM neon instructions. Do you know any issues regarding function level optimizations and the Aarch64 gcc? Regards

7 years, 8 months

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[ACTIVITY] week ending 2 Dec 2018

by Richard Henderson

[Upstream] Posted a patch set aimed at register allocation vs function calls. It does reduce code size by a percent or two. Emilio did some benchmarking and found that it does help a bit, but does not completely eliminate the effect of the call+ret overhead on the most modern of x86 implementations. Reviewed v2 of tcg/riscv. Still a lot of work to be done, I think. Cleanup of all tcg backends vs re-translation, which is no longer a thing. Cleanup of tcg/i386 vs scratch registers. [Other] Updated the mustang to ubuntu 18.10. I was seeing some weirdness that I'm hoping I can blame on the bionic 4.15 kernel and will be gone with the cosmic 4.18 kernel. Fingers crossed... r~

7 years, 8 months

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[ACTIVITY] Week 48

by Yvan Roux

o 4 days week. o LLVM * 7.0.1-rc2: - Miscompare on AArch64: No luck with Sanitizers enabled, still digging. * Machine Outliner on ARM prototype: - Fixed Pic code issue. - llvm bootstrap in thumb mode gives 4% code size reduction. - Investigating new issues o Misc * Various meetings and discussions.

7 years, 8 months

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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

7 years, 8 months

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[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

7 years, 8 months

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[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

7 years, 8 months

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[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

7 years, 8 months

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[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

7 years, 8 months

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[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

7 years, 8 months

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[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/

7 years, 8 months

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[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.

7 years, 8 months

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