Hi,
We've noticed an issue trying to use the Linaro AArch64 binary bare metal
toolchain release with the MMU turned off for some low-level tests.
Anytime puts, sprintf, etc. gets called, a reent structure gets created with
references to STDIN, STDOUT, STDERR FILE types. A member in the __sFile
struct, _mbstate, is an 8 byte struct, but is not aligned on an 8 byte
boundary. This means that when memset (or a similar function) gets called on
this struct, and doesn't operate one byte at a time, a data alignment fault
will be generated when operating out of device memory, such as on a system
where the MMU has not yet been turned on yet.
I'm still examining possible fixes (I'll probably look at building with
-mstrict-align first), but I wanted to check if anyone had thoughts on the
subject and if Newlib upstream or Linaro consider using Newlib with the MMU
turned off to be a valid use case or if running the code that turns on the MMU
is considered a prerequisite to everything else.
Thanks,
Christopher
--
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by the Linux Foundation.
== Progress ==
TCWG-293 (9/10)
- wrote and tested 64bit division code
- it seems to work
- still need to do performance testing
TCWG-347 Fix PR59142 (1/10)
- split into series of 3 patches
- patch almost ready, was held up by non-availability of the lab
- need to bootstrap on Thumb-1 to prove change made in response to
review comments
TCWG-346 AArch64 Benchmarking: CoreMark & Dhrystone
- no significant progress, no access to the lab
== Next ==
Pick up aarch64 benchmarking when the board becomes accessible again
Submit PR59142
== Progress ==
- 2013.12 releases (4/10):
* stalled due to lab unavailability.
* A couple of backports are waiting for approval, another one is
being debugged.
- cross-validation (4/10): fixed arneb+qemu validations.
- misc (2/10): misc conf-calls and meetings
== Next ==
- Make 2013.12 releases
- cbuild2: continue testing, try to make 4.7 source release
- libsanitizer on AArch64: resume work
== Future ==
Next 2 weeks off (Dec 23rd-Jan 3rd)
== Issues ==
* 1.5 day of due to car issue. (3/10)
* Calxedas are down after lab maintenance.
== Progress ==
* LRA on AArch32:
o TCWG-343 : Make LRA the default for the ARM backend (5/10)
- Turn LRA on by default committed as rev205887
http://gcc.gnu.org/ml/gcc-patches/2013-12/msg01088.html
- New Thumb regressions reported (Cortex-m0 and bootstrap),
analysis ongoing.
- Analysed last week regressions and reported them upstream,
Vladimir fixed them at rev205974.
- iWMMXT issue : work ongoing.
o TCWG-345 : Analyse performance of LRA for ARM. (0/10)
- No progress this week.
* Reviewed some merge requests. (1/10)
* Various meetings. (1/10)
== Next ==
* Continue LRA, merge and patch reviews.
== Progress ==
* Debugging and analysis of various gdb test suite failures [TCWG-34] [5/10]
Updated googledoc sheet with action items and comments on different failures.
Investigated remote core file generation issues.
Prepared a patch to turn off corefile dependent tests in remote configs.
* Debugged gdb.reverse testsuite failures [TCWG-197] [4/10]
Found a memory corruption issue where execution log is being corrupted
in memory.
* Time off for dentist appointment and office relocation stuff [1/10]
== Plan ==
* Figure out a reason and fix for process record memory corruption problem.
* Further analysis of test suite failures in arm-native Vs x86-native
and arm-remote Vs
x86-remote test results.
* Send patch to disable corefile tests in remote mode. Ping process
record and other previous patches.
== Progress ==
- Libssp GCC (4/10)
- Rebased GCC source and added patch for stack protect and test
based on global stack guard. Discussing with Marcus on
generic stack protect set and test versus machine descriptions.
Discussed with ARM and Glibc Maintainers, Dropped my patches
for TLS based stack guard.
- Cbuildv2 experiments (3/10)
- Built cross compiler with Cbuilv2.
- Discussing with Ryan on building tool chain without
cbuild.validation.linaro.org dependency
- PGO support for aarch64 (1/10)
Read a paper on PGO optimization in GCC
- Cross build some benchmarks(2/10). There were omp.h file missing
errors when Linaro tool chain was used. The issue is the tool chain is
not built with libgomp library. Rebuilt the tool chain after checkign
configuration changes with Zhenqiang Chen .
== Plan ==
- Inverstigate Pointer Guard support in Aarch64 glibc
- Continue tesing Cbuildv2
- Continue PGO investigations
== Issues ==
* None.
== Progress ==
* Enable libomp for aarch64*-linux-gnu builds in Linaro crosstool-ng.
* Backporting r200103 and r205509 to Linaro 4.8.
* Try to enable lra and test Spec2k with -fno-move-loop-invariants and
-fira-loop-pressure. But still no overall performance improvement.
(2/10)
* Try conditional compare related changes (CARD 313: 3/10)
- Set LOGICAL_NON_SHORT_CIRCUIT to false in fold-const.c.
- Do ifcombine twice.
- Logs show lots of new FAILs in vrp related cases and no
performance improvement in Spec2k INT.
* Identified the root causes of "uninit warning testsuite failures"
(CARD 304: 3/10)
- Some values are from PHI, which is not handled when checking subset.
- Function is_included_in is conservative. Here is its comments:
/* ... It returns false if ONE_PRED's domain is
not a subset of any of the sub-domains of PREDS (
corresponding to each individual chains in it), even
though it may be still be a subset of whole domain
of PREDS which is the union (ORed) of all its subdomains.
In other words, the result is conservative. */
== Plans ==
* 2013.12 toolchain binaries release.
* Continue on CARD 313 and 304.
== Progress == (4/10)
* TCWG-372 fix Cbuildv2 parsing to handle the new binutils-gdb repository (4/10)
- Completed Card with following commits.
commit e6e39f5d1f7963332b3d7dd2e4400de91847219c
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Tue Dec 10 16:08:17 2013 -0600
Correct get_toolname to work with unified repo: binutils-gdb.git
Secondary fixes required:
- Set config/binutils.conf and config/gdb.conf to use unified repo
binutils-gdb.git.
- Re-enable binutils-gdb.git in config/sources.conf.
- get_toolname now calls get_git_tool and determines the actual toolname
for binutils and gdb from the branch name if the repository is unified.
- Made all other usages of get_git_tool use get_toolname instead.
- checkout() now uses ${repo} as returned from get_git_repo as the git
repository instead of ${tool}.git. This allows a unified repository to
only be checked out once.
- The git parser now determines whether an http:// in a url means a git
service or an svn service.
- The git parser now returns branch names for launchpad urls with branches
in the url.
- The git parser now returns the tool name properly for an svn service.
- The git parser testsuite now has testcases for all new additions.
Also
- Added --snapshots functionality to allow specifying an existing snapshots
directory.
- Add testcases to test.sh to test --snapshots functionality.
- Changes test.sh --snapshots directive to --md5sums to avoid confusion
with cbuild2.sh --snapshots.
* TCWG-323 Interface hardening (5/10)
- Card in progress with following commits:
commit cc7193d8ddb86c4ed7d16086f8ee968ae4bae87f
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Thu Dec 12 11:40:00 2013 -0600
cbuild2.sh: All error exit paths should use build_failure().
commit 2a4ec7fa0b7c48e0c6e05a7549f64e3336022f45
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Wed Dec 11 14:08:51 2013 -0600
cbuild2.sh: Added check_directive() to unify bounds checking.
Also added accompanying top-level test.sh fragments to test
check_directive.
Change-Id: Ia42a4b241a5ca62d41dccf1d8e023980ad0a04d0
commit c9ec21200260bdb26d9fe9b26d7ce390579a0ca2
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Wed Dec 11 13:07:15 2013 -0600
test.sh: Fixed to work with a temporary host.conf file.
Require change due to commit 3b5c576630a8ac08cd3b9ab9eab781308549a858
which requires a host.conf file for finding the cbuild topdir.
Change-Id: I991bb5f2a7949267bf69fba093d6becd202ad138
commit 16a45027be798b06160916234713f5dc35b2ecbb
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Tue Dec 10 18:16:09 2013 -0600
cbuild2.sh: Bounds check --set input.
Change-Id: I8ebffd1809b17962aef58f2a08277d5f639d7e3e
commit d7ee602c24231e24457c93208f749cbdd0357115
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Tue Dec 10 18:03:04 2013 -0600
cbuild2.sh: Remove --srcdir. It didn't do anything.
Change-Id: I5b99c7ae8dc542cb62516104bd0bf9d1888afc52
commit 53e9c74966442c41cc9512f27f46ef849d62bcc8
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Tue Dec 10 17:58:54 2013 -0600
cbuild2.sh: Remove --dispatch support. It didn't do anything.
commit 289ade38f100872653218da4792fbb1650d3b231
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Wed Dec 11 10:27:37 2013 -0600
cbuild2.sh: Bounds check --release switch.
Change-Id: I90804ea02b995d476b148fb68db955d164bc674c
commit 9bae259ebbff193e29899edf8a47190747d2bc1b
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Wed Dec 11 10:09:00 2013 -0600
lib/configure.sh: Add missing closing "
Change-Id: I9eee9a934a6cbb60bd1e2db6b0af9faf19fa5188
commit 16a45027be798b06160916234713f5dc35b2ecbb
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Tue Dec 10 18:16:09 2013 -0600
cbuild2.sh: Bounds check --set input.
Change-Id: I8ebffd1809b17962aef58f2a08277d5f639d7e3e
commit d7ee602c24231e24457c93208f749cbdd0357115
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Tue Dec 10 18:03:04 2013 -0600
cbuild2.sh: Remove --srcdir. It didn't do anything.
Change-Id: I5b99c7ae8dc542cb62516104bd0bf9d1888afc52
commit 53e9c74966442c41cc9512f27f46ef849d62bcc8
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Tue Dec 10 17:58:54 2013 -0600
cbuild2.sh: Remove --dispatch support. It didn't do anything.
Change-Id: I4b6ee8db0d3e74510b95c816469b0c100207972f
* Misc (1/10)
- Now using gerrit with git review for handling cbuildv2 development.
- Reviewed V Chong's proposed outline for toolchain documentation and
made suggestions and edits.
== Plan ==
* Move onto working primarily on glibc Jira cards.
== Issues ==
* Lab migration took cbuild.validation.linaro.org down for several
unplanned days and therefore toolchain sources were unavailable during
that time. I made do by adding some features into cbuildv2 to use
alternative snapshots directories.
== This week ==
- Completed backport of 202259, 202407, 202020, 201261 and 201263
- Submitted merge requesSt for completed backports
== Next week ==
- Begin work on other assigned backports
== Future ==
Document missing features of cbuild for backports
== Progress ==
* Pragma Vectorize
- Comparing pragma OMP to mimic for vectorize
- Implementing the lexer/parser
- http://llvm.org/PR18086
* Android LLVM
- Wasting time for the last time with Odroid XU and Android
- Will focus on Nexus 4, 5 and 7
* Integrated AS
- Changed to enabled by default
- Discussing some bugs found on Android unwind library (inline asm)
- http://llvm.org/PR18231
* Release 3.4
- There were some muddled merges, folks are trying to fix
- Bero found a serious bug, seems to be result of the bad merge
- http://llvm.org/PR18201
- Tested RC2, waiting for RC3
* Background
- Discussions, lots of patch reviews
* Time
- CARD-862 8/10
- Others 2/10
== Plan ==
* Continue implementing pragma vectorize in Clang
* Wait for the next release candidate, test, benchmark
* Follow up in the IAS issues raised
* If RemoteChild is gone by then, continue the MCJIT refactoring
* Have a look at TableGen users
== Issues ==
I saw a black cat, under a ladder, with a hockey mask...
== Progress ==
* Bugfixing and testing QEMU AArch64 FP patches (7/10, VIRT-183)
* Debugging and submitting a patch for issue with Ruby and ARM pointer
encryption (2/10)
* Other miscellaneous work: glibc patch review, binutils testsuite
patch, expenses (1/10)
== Issues ==
* None
== Plan ==
* 2 day week next week then off until Jan 8th
* Wrap up qemu work to a good state to handover
--
Will Newton
Toolchain Working Group, Linaro
== Progress ==
- cross-validation: (1/10). Follow-up, minor maintenance and
discussions on a few regressions. Now able to share top-level
reports.
- backports (1/10):
* multilib_defaults for 4.7
* committed all approved backport
* helped Michael solve some conflicts
- disable peeling: (3/10)
* confirmed it is now done by default on trunk, as part
-fvect-cost-model=XXX.
* Looked at benchmarks, comparing
-fvect-cost-model=cheap (default) and
-fvect-cost-model=unlimited.
- benchmarks on trunk (1/10): observed some variations from one month to
another on a few cases (checked June-November). This confirms
the need to run benchmarks regularly on trunk, in addition to
release branches.
- cbuild2 (3/10): continued working on source release. Submitted a few
small patches for review+integration.
- misc (1/10): various conf-calls and meetings.
== Next ==
- Make 2013.12 releases
- cbuild2: continue testing, try to make 4.7 source release
- libsanitizer on AArch64: resume work
== Issues ==
* Tcpanda03 seems unusable.
== Progress ==
* LRA on AArch32:
o TCWG-345 : Analyse performance of LRA for ARM. (5/10)
- Installed Saucy on Chromebook, lot of time wasted due to defective SD card
- Frequency governor now set to performance.
- Benchmark setting ongoing
- Tcpand03 SSH access re-enabled, board setting seems ok, but respawned
benchmarks are stuck and the board is no more reachable
o TCWG-343 : Make LRA the default for the ARM backend (2/10)
- Reduce iWMMXT testcase, analysis ongoing.
- Trunk testsuite with LRA shows a couple new faillures.
* Reviewed some merge requests. (1/10)
* Loop specialization patch review started. (1/10)
* Various meetings. (1/10)
== Next ==
* Continue LRA, merge and patch reviews.
== Progress ==
* Updated, tested and submitted new patches for a couple of gdb
testsuite failure on arm. [TCWG-269] [TCWG-34] [1/10]
* Performed GDB git repository testing suite results comparison:
[TCWG-34] [2/10]
Compared results and prepared googldocsheets for the following:
arm-native Vs arm-remote
arm-native Vs x86-native
arm-remote Vs x86-remote
* Investigated difference/failures in arm-native vs arm-remote
comparison sheet. [TCWG-34] [5/10]
Re-ran timeout failures with different values of timeouts.
Figured out causes of failures.
Figured out why some tests exit without emitting any logical result.
* In response to comments upstream tried to figure out alternate fix for
dwarf2 fortran parameter test. [TCWG-267] [TCWG-34] [1/10]
* Miscellaneous activities [1/10]
== Plan ==
* Analyze new failures in arm-native Vs x86-native and arm-remote Vs
x86-remote test results.
* Fix test suite failures and submit patches if any.
* Spend some time pining/updating/re-submit previous patches.
== Progress ==
- libssp gcc
Initiated mails for upstream discussion on supporting global and TLS
based libssp ABI for Aarch64. Now waiting for feedback from ARM
maintainers.
- Built few benchmarks with Linaro tool chain binaries. Faced some
openmp failures, compiler disabled for libgomp. Looking to rebuild
the linaro cross tool chain.
- Rebased glibc trunk and ran cross glibc tests on V8 foundation
model. With TLS SSP patch glibc's libresolve.so fails to build
because the stage 1 GCC compiler emits global stack_chk_guard. The
glibc dos not export global stack_chk_gaurd, when TLS based stack
guard is set. Now looking at supporting and test both TLS and global
stack guard ABI, but before that waiting for confirmation from ARM
maintainers.
- Reinstalled linux 13.04 ubuntu on my laptop
- Tested the patch
http://gcc.gnu.org/ml/gcc-patches/2013-12/msg00170.html for
aarch64-none-elf target. No regressions found.
== Plan ==
- Continue upstream discussions and post RFC patches for glibc and gcc libssp
- Explore on cbuildv2
- Cross Build few openmp benchmarks
== Issues ==
* None.
== Progress ==
* 1.5 days off.
* Misc update for Linaro crosstool-ng
- Re-enable parallel build for do_cc_core.
- Add linaro-armeb-none-eabi config.
- Update all CT_TOOLCHAIN_PKGVERSION to "Linaro GCC 2013.11"
* Share toolchain binaries configures to cbuild2 group.
* Backporting r200103 and r205509 to linaro 4.8.
* Collect Spec2k INT results with -fno-move-loop-invariants and
-fira-loop-pressure on X86-64 and ARM Chrome book. Performance of
different cases waves from -2% - 2%. But the overall performance
changes < 0.5%.
== Plan ==
* Continue on CCMP.
== Progress ==
* Setup new git mirror of new binutils-gdb.git repository, and
added a cron job to update it every 10 minutes. (#369, .5/10)
* Started modifying Cbuildv2 to use new binutils-gdb
repository, which changes how we parse URLs. (.5/10)
* Modified Cbuildv2 to produce fully statically linked binaries so
32bit ones run on any distro, including 64 bit. (#368, 3.5/10)
* Worked with LAVA team to set up a private Jenkins for TCWG use
only to protect test and benchmark data. (#379, 2/10)
* Fixed Cbuildv2 bug where the dryrun function wasn't properly
trapping configure and build errors. (.5/10)
* Meetings & Card maintainance. (2/10)
* Quick winter camping trip at the hot springs for my bday, hit -38C !
== Plan ==
* More tweaks to source and binary tarball creation.
* Finish modifying Cbuildv2 to use new binutils-gdb repository.
* Fix all the minor bugs caused by properly trapping errors from
dryrun function.
* Make the new Jenkins build in a 32 bit chroot on the TCWG build
machines
* Figure out why Jenkins doesn't import the Junit files.
* Copy .sum files to remote host.
* If new Arndale or APM boards arrive this week like promised,
start evaluating them.
* Get the S&M team to start using Gerrit for merge requests for
Cbuildv2.
== Progress ==
* TCWG-367 drop --dostep, add --checkout (1/10)
Completed with following git commits:
commit 2d4d7588c1b05801ee5e1a924c8641ff7c322c07
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Fri Dec 6 11:46:40 2013 -0600
cbuild2.sh: remove --dostep. It's no longer supported.
Also added testcase to make sure it returns an error.
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Fri Dec 6 10:57:34 2013 -0600
Add cbuild2 --checkout <package>|all support with tests
* misc (1/10)
commit 9fb1c4404f8065ef844154e614ff4e7086fce176
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Thu Dec 5 12:21:20 2013 -0600
lib/package.sh: git status should be run in the current directory.
commit 7bb4a9ce8ef440655fe45e6819b57da8d61e8728
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Wed Dec 4 11:47:56 2013 -0600
lib/package.sh: git st should be git status.
* TCWG-356 Unify GIT URL parsing (5/10)
* TCWG-359 Change branch character (2/10)
Closed with following git commits:
commit c9368930e6fb1ad46d08c2dbcc34d8167344ad28
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Tue Dec 3 16:29:00 2013 -0600
Finish git parser refactoring, use stamp functions, complete
dryrun wrapping.
commit eabbc74e48bc8c3a4addbc53ec6a492521193a0c
Author: Ryan S. Arnold <ryan.arnold(a)linaro.org>
Date: Wed Nov 27 16:31:20 2013 -0600
Working additions for git parser refactor and stamping.
== Issues ==
*misc (1/10)
- Discovered a bug in glibc when using upstream (4.9) gcc that isn't
present in 4.8. This might have something to do with how binutils
interacts with the compiler instead of simply a compiler issue:
elf/dl-addr.c:152: multiple definition of `_dl_addr_inside_object'
elf/dl-open.c:746: first defined here
== Plan ==
* Create card for new glibc multiple definition problem,
* Start working on glibc related cards
== This week ==
- Completed backport of 197997
- Completed backport of 203774
- Worked on GCC 4.8 FSF Release Branch Merge and initiated merge request
and build
== Next week ==
- Work on GCC 4.7 Release branch Merge
- Begin work on other assigned backports
== Future ==
Document missing features of cbuild for backports
== Progress ==
* MCJIT (2/10)
- Disabling Remote MCJIT for now, just to add the self-hosting bot
- Working on a more robust message passing interface
- http://llvm.org/bugs/show_bug.cgi?id=18057
- Progress stalled, waiting for changes to child process handler
* Buildbots (2/10)
- Adding Chromebook self-hosting buildbot
- http://lab.llvm.org:8011/buildslaves/linaro-chrome-02
- Adding Odroid XU check-all buildbot
- http://lab.llvm.org:8011/buildslaves/linaro-odroidxu-01
* Vectorizer (2/10)
- Implemented #pragma vectorize enable in LLVM
- http://llvm.org/bugs/show_bug.cgi?id=18086
- Adding support in Clang to add metadata to IR for all three pragmas
* Android (1/10)
- Trying LLVM kernel on XU again
- Managed to get adb/astboot to work
- Custom kernels won't boot, Tinti will create a full image (CM+LLVM)
* Release 3.4 RC2 (1/10)
- Testing, no regressions
- Some benchmarking regressions, investigating
- http://llvm.org/pre-releases/3.4/rc2/
* Background (2/10)
- Reviewing patches, discussions, meetings, etc
== Plan ==
* Continue implementing pragma vectorize on Clang
* Further release 3.4 testing and benchmarking
* Continue investigating benchmark results for 3.4
* Re-start MCJIT MPI once changes to the child process handlers are in
Hi,
According the debian bug report [1], it is not possible to use std::future
on armv5 targetting toolchains. This is because libstdc++ will only enable
std::future if ATOMIC_INT_LOCK_FREE > 1. There is no LDREX for armv5 and
older, so this definition is set to ATOMIC_INT_LOCK_FREE when compiling for
ARMv4t or ARMv5.
My impression is that you should be able to use the kernel helpers for
atomic operations in lockfree (?) manner, so the ATOMIC_INT_LOCK_FREE
definition is probably incorrect on older arm archs then?
Riku
[1] http://bugs.debian.org/727621
== Progress ==
* Disable peeling:
- spawned benchmarking jobs using recent trunk and another older
one to check for performance regressions.
- locally generated the code for the same benchmark to analyze the
differences
* cbuildv2:
- retried to create 4.8-2013.11 source release. Identified a couple
of minor issues, reported to Rob.
- for 4.7-2013.11, need support for subdir in git URLs, fix on-ongoing by Ryan
* Backports:
- gave some support to Michael
- a few have been reviewed/accepted.
* libsanitizer: little progress this week; advised to take a look at
recent LLVM sources.
* trunk validation: filed some bugzilla reports; 2 of them fixed by Kyrill.
== Next ==
* Disable peeling:
- check benchmarks results
- check code generation
* cbuildv2: re-do source releases 4.8 and 4.7 2013.11
* Backports:
- commit already approved ones, once cbuildv2 releases are OK
- see which ones can be easily added
- work on MULTILIB_DEFAULTS backport for 4.7
