=== Work done during this GCC week ===
* TCWG-1379 (stack-protector failure on GCC ARM): need feedback from
community
+ reproduce on trunk and find out why it happens on ARM and not AArch64
or x86
+ find potential issue for all targets as well, though less likely
+ find discrepencies between code and documentation and wondered if code
is not overly zealous in some case
* 2 days doing Arm handover & meetings
=== Plan for next week (week 12) ===
* Progress on stack-protector failure
* Support arithmetic on FileCheck regex variable: finish patch
Progress:
* VIRT-65 [QEMU upstream maintainership]
+ sent another patch related to linux-user signal frames (a wrinkle
I had thought had no effect with SVE disabled turns out to be
relevant in the no-SVE case too)
+ testing and applying patches for 2.12 rc4
+ code review:
- latest spin of the SMMUv3 emulation patches
- some last-minute fixes to our softfloat refactoring
- memory barrier handling in the 32-bit arm TCG backend was broken
+ tracked down a zephyr test failure on QEMU as the same bug in
the Zephyr timer device driver as the one I reported 6 months ago...
+ sent a patch fixing linux-user emulation of getdents syscall for
64-bit guest on 32-bit host
+ sent a patchset that removes the long-standing "only 4 serial ports"
limit in QEMU (various Arm boards really have 5 or 6)
+ some patches fixing errors in arm boards that don't properly
register all their RAM regions for migration
thanks
-- PMM
[VIRT-198 # QEMU: SVE Emulation Support ]
Cleaning up patches and fixing RISU failures.
[UPSTREAM]
Review of the tb_lock patch set.
Finish review of the v2 TranslateOps patch set.
Pushed a couple of softfloat fixes and an icount fix for 2.12.
r~
Note1: working for Linaro every other week
=== Issues ===
* IT issues made me loose 1 day of work
=== Work done during this LLVM+GCC week ===
* LLVM PR34170 (crashes with inline asm with double output operand in GPR):
internal review
+ improved patch to also support case with several output operands
-> had to choose to relax test a bit to not put expectation on
register allocator
* Support arithmetic on FileCheck regex variables: in progress
+ an attempt to be able to express that 2 registers are related by some
arithmetic expression (eg. vmov dY, rX, rX+1), seems doable
Upstream work on Arm GCC side:
cmse_nonsecure_caller return wrong answer: backported to GCC 7
* __builtin_arm_set_fpscr crashes with literal values input: committed to
trunk, backport oked
+ do more testing and prepare backport to GCC 6 & 7
* PR85344 (GCC fails constraint check on valid code): in progress
+ 2 prototype patches done but inconclusive result
+ pondering what should be the expect behaviour
+ investigating the extent of the problem -> both immediate and register
constraints can be surprising
=== Plan for next week (week 12) ===
* Investigate stack-protector failure with Linaro GCC 7 toolchains
* DSGHACK-25 (Support arithmetic on FileCheck regex variable): finish patch
=== Planned leave ===
* 28th April -> 29th May Sabbatical (Trip to France, then China, then
France again)
Progress:
* VIRT-65 [QEMU upstream maintainership]
+ sent patch fixing problem where some aarch64 binaries would segfault
under linux-user (changes for SVE accidentally caused them to get
a too-small signal frame)
+ wrote an RFC kernel patch which sanitizes the ESR value reported to
userspace for faults on kernel addresses, rather than dropping it
entirely
+ wrote a patch to fix a reported QEMU compile failure for Arm
guests on MIPS hosts
+ code review:
- various bug fixes for 2.12
- another round of the patchset to implement the PMU properly
- DS1338 RTC device emulation overhaul patches
- QEMU side of changes to allow more than 123 CPUs with KVM
(mostly involving allowing split GIC redistributor regions)
- linux-user FDPIC ABI support
Hopefully next week I'll be able to get back to non-release
related work...
thanks
-- PMM
* Short week: off Mon/Tue/Wed
== Progress ==
* GCC
- FDPIC
- binutils: patch series approved, waiting for clarification on target name
- GCC: cleaning patch series, fixing lto problems
* GCC upstream validation:
* Infrastructure:
- Linux kernel + lava failing: still failing, it seems the fix
hasn't been merged yet
- TCWG-1335: GCC validation results now sent to gcc-testresults
- looked at some random problems (?) in our GCC validation
* misc (conf-calls, meetings, emails, ....)
== Next ==
* FDPIC:
- Handle feedback on binutils and QEMU patches
- GCC continue cleanup
* GCC upstream validation
Hi Team,
Could you please let me know which version of toolchain released from Linaro starts to support LTO? Thanks
David
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[TCWG-1375] Make sure MCSubtargetInfo is passed through to
ARMAsmBackend functions
Spent most of the week working on this and follow up patches. Have
submitted a patch for the most important functions. Nearly have one
ready for the correct Nop encoding, this is more complicated as Nops
can be used as padding.
[Plans]
In office Monday Tuesday only.
Progress [TCWG-1375]
Planned Absences:
- At ACCU conference Wednesday - Friday [Holiday]
- At Euro LLVM following Monday Tuesday
