[VIRT-327 # Richard's upstream QEMU work ]
Review Mark's target/ppc getVSR patch set.
Two rounds of "tcg vector improvments"; hopefully that's
ready to go in on Monday.
More work on "bit select" and "compare select" primitives.
I can now vectorize Neon VSHL/VSHR variable shift (where
positive values are left shift and negative values are
right shift). Waiting on posting this while previous tcg
vector patch set is still in flight.
Review Alex's demacrofy v5. Wrote a boot.S for Alpha.
Review David's latest target/s390 vector patch set.
Review Sato-san's target/rx v8. Played around with a few
disassembler improvements, but I'll not confuse the review
process by posting them now.
r~
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.
