Progress:
* VIRT-65 [QEMU upstream maintainership]
+ pushed QEMU 4.0 out the door
+ code review:
- RTH's patchset that cleans up the softmmu TLB structs
- Nios2 nommu and semihosting patchset from codesourcery
- cleanup series removing a "bucket of random stuff" header file
- RTH's patchset adding BTI support for linux-user mode
- RTH's patchset cleaning up the tlb_fill API
- RTH's patchset implementing Cortex-A73, A75, A76
- "SBSA reference platform" new board model
- patchset adding Netduino Plus 2 board model
- linux-user patch to correctly handle loading ELF segments which
have no file data (ie only bss)
- patch adding the RTC device to the ASpeed board models
- patchset fixing various minor problems preventing QEMU building
cleanly for Windows-on-Arm
- started looking at Damian's patchset that overhauls how we do
device reset; this is good work that's long overdue, but reviewing
it requires me to wrap my head around the problem space...
+ sent out v2 versions of a few minor patches that needed respins
+ wrote email to qemu-devel asking for volunteers to help with
QEMU release work so it's not only me doing this every cycle
* VIRT-268 [QEMU support for dual-core Cortex-M Musca board]
+ FPU support now upstream
+ a few loose ends remain to be tidied up, but this epic is
now essentially complete
NB: out of office Tues 7th afternoon to attend a couple of lectures
at the CL by people from Amazon on their virtualization stack written
in Rust (http://talks.cam.ac.uk/talk/index/119491 and
http://talks.cam.ac.uk/talk/index/121069)
thanks
-- PMM
[LLVM-158] Buildbot monitoring duty
- Reported bug that libc++ when built as part as libfuzzer is not
built with PIC or PIE, yet some tests for non-x86 force PIE which then
fails at link-time.
- Reported bugs in libstdc++ and clang where exception specifications
didn't match due to extra parentheses. libstdc++ now fixed to not have
any discrepancy, clang bug for not ignoring the extra parentheses
still active.
- Investigated libfuzzer intermittent failures, 2 look like timeouts
not being long enough, submitted patch to get this increased.
[LLVM-122] BTI/PAC Started prototyping an implementation based on top
of the yet to land LLD patch for Intel CET.
Think about how to add crypto extensions without overriding
architecture in a complex build system.
Review comments for LLD and compiler-rt, and mailing list proposal for
something similar to __attribute__((at(address))).
* 1 day off (public holiday)
== Progress ==
* FDPIC
- Looked at gdbserver memory consumption increased since release 7.5.
Found similar results to Prathamesh. On arm-linux-gnueabihf with a
sample test program, gdbserver memory usage increased from ~500kB to
~1.5MB. But that should not prevent execution on board (which has
16MB); maybe memory fragmentation?
- rebased GCC FDPIC patches. There's a regression since Thomas
committed fixes to fstack-protector.
* GCC upstream validation:
- ST internal validation broken since GCC bumped to version 10. I was
using an old glibc. Upgrading glibc proved to be painful (requiring
new versions of make, bison, python....). Still using RH6 servers.
* GCC
- ubsan on bare-metal toolchain: Sent an email to llvm-dev list,
requesting help in how-to-cross-build runtime libs in clang/llvm. No
response so far....
* Infra
- [stalled] working on adding binutils regression testing to round-robin jobs
- fixed legacy binutils regression testing by switching to new slaves
- sent patches to support new slave (tcwg-lc-01)
- sent ABE patches to support new gcc9 config, and update to latest-rel config
== Next ==
FDPIC:
- GCC: fix problems with fstack-protector
UBSAN/bare-metal: look at how to make it easier to use on CPUs that
lack sync primivites (eg cortex-m0)
Infra:
- Fix ST internal validation
== Progress ==
* Out of office 1 day (public holiday)
* [GlobalISel] Better support for small types [LLVM-553]
- Fixed the bug that I'd been looking into
- Committed support for several instructions, only 3 left to commit next week
* IR SVE Reviews [LLVM-545]
- Looked into the patches for stack management
* GlobalISel code review
- Currently looking into an unpleasant patch adding a new opcode
* Catching up on Connect / EuroLLVM
== Plan ==
* More of the same
* Out of office end of May - beginning of June
[VIRT-327 # Richard's upstream QEMU work ]
Another round on launchpad 1824853, TB overflow.
This time handling relocation overflow. Which would
not be seen on an x86 host (2GB displacement), but
would affect some of the risc hosts.
Reviewed Peter's v7m fpu patches.
Another round on util/path.c, fixing the startup loop
that we get into for using a full chroot for -L.
Poked my nose into Alex's cputlb demacrofy patch set.
Hopefully the feedback was helpful...
First two pull requests for 4.1.
r~
[PR40542] Sent patch for -n and -N support in LLD for upstream review
[LTO]
Investigated problems when using -Os -Oz with LTO, raised 2 PRs
- error if clang linker invocation uses -Os and -Oz
- strange error message when .bc used as a file extension for a
separate compile and link step
Crash in GNU ld when linking LLVM lto via the gold plugin. Looks like
a memory access/corruption problem in the conversion from .bc to bfd.
Other miscellaneous reviews for some linker script support in LLD.
Investigation into why ld.bfd with NOLOAD on the .gnu.build-id section
corrupts debug information.
== This Week ==
* PR88837 (7/10)
- Discussed and finalized algorithm for vector construction with Richard.
* GNU-606 (1/10)
- Experimented gdbserver memory consumption with docker.
* Public Holiday (2/10)
== Next Week ==
- Continue ongoing tasks.
== Progress ==
* Short week (Out of office 22 - 24 April)
* [GlobalISel] Better support for small types [LLVM-553]
- Investigated my bug some more, it doesn't seem to be related to my
recent patches but rather an existing issue which is exposed because
we select more functions now
- Might be related to LLVM-456 (Fix frame index sizes for i<32)
* Catching up on Connect / EuroLLVM
== Plan ==
* Try to confirm root cause of LLVM-553 issue
[VIRT-327 # Richard's upstream QEMU work ]
Fix TranslationBlock overflow, launchpad 1824853.
Investigated launchpad 1824768, i386 emulation on arm32.
But works-for-me.
A bunch of work on new gvec primitives. Primarily to
support David Hildebrand's target/s390 conversion, but
it does enable more vectorization in target/arm as well.
r~
== Progress ==
* FDPIC
- Troubleshooting with stm32f469-disco. Trouble connecting via
cross-gdb over openocd. Updated GNU-411 and discussing with Omair.
Created GNU-606 to investigate if gdbserver memory consumption
increased since release 7.5.
* GCC upstream validation:
- little activity this week, close to e/o stage 4
* GCC
- ubsan on bare-metal toolchain: discussed with Peter, I will send an
email to llvm-dev list.
* Infra
- several boards crashed, increasing Jenkins build queue
- working on adding binutils regression testing to round-robin jobs
== Next ==
More of the on-going tasks
== Progress ==
* Short week (Out of office 18 - 19 April)
* LLVM 7.1.0 Release for ARM & AArch64 [LLVM-546]
- Uploaded binaries for both ARM & AArch64
* [GlobalISel] Better support for small types [LLVM-553]
- Still in progress (currently investigating a bug)
* Catching up on Connect
== Plan ==
* Back at work on Thursday, April 25th
Progress: (very short week, 2 days)
* VIRT-65 [QEMU upstream maintainership]
+ QEMU release work: flurry of last minute stuff for rc3. I hoped
we would not need an rc4, but as usual a release-critical issue
was found, so we will be having one.
+ code review
* VIRT-268 [QEMU support for dual-core Cortex-M Musca board]
+ worked through some final bug fixes
+ sent out v1 of the FP support patchset for review
thanks
-- PMM
(Previous week was Connect.)
Progress: (short week, 3 days)
* VIRT-65 [QEMU upstream maintainership]
+ QEMU release work: flurry of last minute stuff for rc3.
I hoped we would not need an rc4, but as usual a release-critical
issue was found, so we will be having one.
+ code review
thanks
-- PMM
== Progress ==
* FDPIC
- Experimenting with stm32f469-disco. It seems recent gdbserver is now
too large to load (issues when trying to map libstdc++.so while
attempting to load a simple hello.c)
* GCC upstream validation:
- little activity this week, close to e/o stage 4
* GCC
- ubsan on bare-metal toolchain: experimenting with multlibs
* Infra
- improved reporting of some jobs, improved error handling
== Next ==
More of the on-going tasks
== Progress ==
* LLVM 7.1.0 Release for ARM & AArch64 [LLVM-546]
- Final candidate build in progress
* [GlobalISel] Map and select G_FCONSTANT [LLVM-552]
- Committed upstream
* [GlobalISel] Better support for small types [LLVM-553]
- In progress
== Plan ==
* LLVM-546, LLVM-553
[Conferences]
Linaro connect and EuroLLVM. Please see trip reports already posted. A
bit of a gruelling week of Travel going from Bangkok straight to
Brussels, with just a short half a day in between at home in
Cambridge.
[Activity]
- A number of reviews whilst away
- Started looking at how to build an embedded toolchain with Linaro's
ABE and work out how to fit it into their infrastructure.
Planned Absences
Holiday 12- 16th, back on Wednesday.
