Hello,
# TCWG CI — GDB
- Continued investigating issue with GDB on armhf-linux about getting
SIGILL when trying to detect shared library loading/unloading. Noticed
that the problem happens only in tests that use the distro's toolchain
(either because they're for a language we don't build in ABE gcc, or
because GDB itself is built with the distro toolchain), so the impact
isn't as widespread as I initially thought. It still frequently causes
trouble for our CI loop though. Working on a fix.
- Investigated and fixed loop in gdb.reverse/step-reverse.exp that was
causing tcwg_gdb_check--master-arm-build jobs to get stuck, as
reported by Maxim. Posted patch to the GDB mailing list.
# TCWG Infrastructure
- Reviewed Gerrit requests about testing mailing list patches in our CI.
--
Thiago
Progress (another short week, May is great this year):
* UM-2 [QEMU upstream maintainership]
- More review on some of RTH's atomics related patchsets
- Put together an arm pull request
- Sent out a call for agenda items for QEMU Summit
* QEMU-530 [QEMU ARM v9.4 Baseline CPU for TCG]
- decodetree load/store conversion done, patches sent out for review.
After this I plan to go back to the FEAT_MOPS implementation
(and then do the last part of the integer A64 decodetree
conversion later in this release cycle).
-- PMM
Hello,
# TCWG CI — GDB
- Investigating issue in CI jobs where touching all C files causes GDB
to show a warning about the source being newer than the executable.
This interferes with a few GDB tests.
- Continued investigating issue with GDB on armhf-linux about getting
SIGILL when trying to detect shared library loading/unloading. Found
out that the GDB testsuite binaries are using the distro's ld.so
rather than the one built by ABE and which is the one expected to be
used. Because we don't have debuginfo installed for the distro's
ld.so, we hit the GDB bug in armhf-linux. The ld.so built by ABE has
debuginfo and would avoid hitting the issue.
# TCWG Infrastructure
- Reworked CI job to sanity check tcwg_gnu_fast_check_{gcc,gdb} and
posted new version for review.
- Reviewed some Gerrit requests for jenkins-scripts and ABE.
--
Thiago
Progress (short week, three days):
* UM-2 [QEMU upstream maintainership]
- Sent a patch fixing a bug where we broke some M-profile uses
(resulting in assertion failures) when we added v8R support
* QEMU-530 [QEMU ARM v9.4 Baseline CPU for TCG]
- Implemented support for a new feature in the decodetree
generator that I need for the A64 decodetree conversion,
sent patches out for review
- More progress on A64 decodetree: loads and stores
-- PMM
Hello,
# TCWG CI — GDB
- Analysed a number of potential regressions found by our CI on
aarch64-linux and armhf-linux. They aren't exactly regressions but bug
fixes or new features that work on other arches (or perhaps whose
testcases correctly detect PASSes on other arches) but not on
aarch64-linux or armhf-linux.
- armhf-linux has an important problem where a bug with detecting shared
library loading/unloading is causing many tests to fail. The result is
that every new GDB commit that adds a test is flagged by the bisect
job. This was caused by a GDB commit from November 2022. Luis reported
it at the time and the patch author was going to look into it, but
this probably fell through the cracks. I'm investigating to understand
the problem better and provide a fix.
--
Thiago
Progress:
* UM-2 [QEMU upstream maintainership]
- Reviewed another round of RTH's patchset overhauling atomics
- Sent an arm pullreq
* QEMU-530 [QEMU ARM v9.4 Baseline CPU for TCG]
- Continued with the conversion of the A64 decoder to decodetree:
have converted hints, barriers, system register insns,
exception generation, and am halfway through the loads and stores.
-- PMM
Hi,
Has anyone noticed that https://lab.llvm.org/buildbot/#/builders/198 (clang-aarch64-sve-vla-2stage<https://lab.llvm.org/buildbot/#/builders/198>) has been timing out for the past few days? "Duration" is often less than 1hr, so that's odd. And all Flang buildbots are green, so it's unlikely caused by changes to that sub-project (https://lab.llvm.org/buildbot/#/builders/198/builds/1804). Would anyone be able to take a look?
Best regards,
Andrzej
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Hello,
# TCWG Infrastructure
- Reviewed a bunch of Gerrit requests for our CI scripts.
- Finished job definition to run fast_check_{gcc,gdb} jobs triggered by
new Gerrit review requests for jenkins-scripts, benchmark scripts and
ABE. Sent Gerrit review request and now working on 2nd version.
- Rebased our DejaGNU debug patches to upstream dejagnu-1.6.3, tested
result and sent Gerrit review request for it.
# TCWG CI — GDB
- Confirmed regression found by CI job¹ and mentioned by Maxim. Found
out that it was fixed upstream already².
--
Thiago
¹ https://ci.linaro.org/job/tcwg_gnu_native_check_gdb--master-aarch64-bisect/…
² https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=5a6ad5c775a58367…
Progress (another short week, May is full of bank holidays :-)):
* UM-2 [QEMU upstream maintainership]
- usual background level of code review etc
- investigated a bug reported by Mozilla where people running x86 Firefox
on QEMU on Arm hardware were seeing crashes; narrowed down the cause
(aided by Mozilla kindly providing a minimal repro test case),
and Paolo produced a fix.
* QEMU-530 [QEMU ARM v9.4 Baseline CPU for TCG]
- Started looking at what is required for FEAT_MOPS (the
memcpy/memset/memmove insns), what they do and how QEMU ought
to implement them.
- The new insns are in the load/store part of the A64 instruction
space. To make this easier to do, we should really convert at
least the integer parts of the A64 decoder to decodetree (a
refactoring we've been putting off for a long time). Started on
the conversion: sent out a first 20-patch patchset that converts
the dp-immediate and branch insns.
-- PMM
