Sent the patch which implements register pressure estimation in SMS to
the gcc mailing list as RFC.
I looked at some of the regressions in libav and intend to continue
with that this week.
== Last week ==
* Caught up on lots of email.
* Looked into the SMS regression that Revital found. Turned out to be
caused by the ARM backend not modelling the VMLA fast accumulator path.
Need to know how the path actually works before modelling it
(the docs aren't clear).
* Continued to look at -fsched-pressure.
Richard
Summary:
* Create crosstool-ng patches and build embedded toolchain on ubuntu-8.04.4.
Details:
* Crosstool-ng patches
* Update old patches according to Michael's comments and revise them
according the guideline.
* Create patches for nls option, newlib and gdb.
* Try to build embedded toolchain on ubuntu-8.04.4. It works after
installing all the dependence libraries.
Plans:
* Upstream the patches.
* Build and test.
Thanks!
-Zhenqiang
Hi there. The 4.6-2011.10 release causes an output miscompare failure
in 175.vpr from SPEC 2000. The fault didn't exist in 2011.09 and has
cleared in 2011.11.
Does this ring a bell with anyone? Andrew, could it be related to
your widening multiplies fix?
-- Michael
Hi,
* rewrote the Android.mk of libunwind to make use of autoreconf and libtool
* finished my work on libunwind
* upgraded my Linaro Android build environment
* debugged Linaro Android build failures (#891753)
* tested backtracing on the Linaro Android 2.3.5 and 2.3.7 branches
* documented debuggerd usage on Android:
https://wiki.linaro.org/Platform/Android/DebugAndroidSystemComponents
* Debugged a linking failure of the android perflab benchmark that Andy
is seeing. Turns out that the GCC is optimizing two consecutive calls to
sinf and cosf (same angle) are optimized by the GCC to one sincosf call.
The libm provided by the benchmark is lacking sincosf. Workaround is to
use -fno-builtin-sinf -fno-builtin-cosf.
Regards
Ken
== 64 bit atomics ==
* Still fighting membase
* Cleaned up a bunch of other issues, but I'm back at an 'expiry'
issue, where the test
stores some data with a fixed expiry time and then waits until after
it should have expired,
and checks it has. Except on ARM it sometimes doesn't expire quickly
enough. I've got
enough debug now to see that the server processes view of time (which
it updates via
an event about every second) is sometimes very behind gettimeofday()'s
view of time - and
have a small test for it. This doesn't seem to happen on x86. The
good part is that it's now
a much smaller test, the bad part is that it fails rarely - somewhere
between 1/1000 and 1/100
depending on its mood.
* Looked at a few other things to see if they might use 64 bit atomics:
- spice's (as in the VNC like protocol) FAQ said it needed 64bit
atomics and didn't work
on 32bit machines due to that; but the source appears to have been
fixed for 32bit.
- Looked at boost lock-free; it does have an implementation using
gcc's __sync primitives,
however for ARM it uses a hand coded set of primitives, those are
missing the 64 bit implementation,
but the contributor of the ARM code said that the boost lock-free
author preferred
not to use the gcc primtives.
== Other ==
* Testing latest libffi rc
- Had most of my varargs for hf fix in (had missed one part of a test)
* 1 day of non-linaro work
I'm on holiday next week.
Dave
(short week, 4 days)
RAG:
Red:
Amber: we still haven't settled on engineering blueprints and schedule
for the KVM work. Proceeding with some obviously necessary bits anyway
Amber: not clear whether we can do virtio-mmio this quarter
Green:
Current Milestones:
|| || Planned || Estimate || Actual ||
||upstream-omap3-cleanup || 2011-11-10 || 2011-11-10 || ||
(still no milestones, see above)
Historical Milestones:
||add-omap3-networking || 2011-10-13 || 2011-10-13 || 2011-10-13 ||
||a15-systemmode-planning || 2011-10-13 || 2011-10-13 || 2011-09-22 ||
||a15-usermode-support || 2011-11-10 || 2011-11-10 || 2011-10-27 ||
== upstream-omap3-cleanup ==
* spent a half day on this to try to get this blueprint tidied away
even if we aren't going to have much time for the later upstreaming
== other ==
* A15/KVM planning
* experimenting with getting an A15 kernel booting on Fast Model
(see https://wiki.linaro.org/LoicMinier/Sandbox/FastModels
and https://wiki.linaro.org/PeterMaydell/A15OnFastModels)
* estimated required work for doing a qemu model of a board for
one of the Landing Teams (ans: 6 man months +)
Hi,
- spent most of the week trying to reproduce regressions with vectorization
- started bringing the latest SLP feature, condition with different
types, to gcc-linaro. There are 5 patches. Merged one, started to
prepare another one.
- fixed PR 51112
Ira
Hi,
I've now put this at :
https://wiki.linaro.org/WorkingGroups/ToolChain/Meetings/2011-11-15
Are there any other topics that folks want to bring up ?
The one thing worth thinking about ahead of time is if we want to
bring ahead the call by an hour to allow Michael to join at a not so
crazy hour for him. What do folks think of 9 a.m. Tuesdays /
Wednesdays UTC ?
cheers
Ramana
Hey
When building u-boot for an ARMv5T platform (versatileqemu_config), the
Ubuntu-packaged Linaro cross-toolchain isn't suitable because it
only offers an ARMv7T2 libgcc. But I'd like the build to fail when
that happens rather than silently generating an u-boot.bin which will
trigger a SIGILL when it hits the first non-ARMv5T instruction.
I heard that gcc/ld are supposed to check this, but I'm not sure how
it's supposed to work; perhaps the way u-boot does its final link
prevents this from working properly?
I tried building u-boot as follows:
make O=obj-broken \
CROSS_COMPILE=arm-linux-gnueabi- ARCH=arm \
OPTFLAGS="-marm -march=armv5te" \
versatileqemu_config
make O=obj-broken \
CROSS_COMPILE=arm-linux-gnueabi- ARCH=arm \
OPTFLAGS="-marm -march=armv5te" \
-j2
The final link looks like this:
UNDEF_SYM=`arm-linux-gnueabi-objdump -x /home/lool/git/denx/u-boot/obj-v-broken/board/armltd/versatile/libversatile.o /home/lool/git/denx/u-boot/obj-v-broken/api/libapi.o /home/lool/git/denx/u-boot/obj-v-broken/arch/arm/cpu/arm926ejs/libarm926ejs.o /home/lool/git/denx/u-boot/obj-v-broken/arch/arm/cpu/arm926ejs/versatile/libversatile.o /home/lool/git/denx/u-boot/obj-v-broken/arch/arm/lib/libarm.o /home/lool/git/denx/u-boot/obj-v-broken/common/libcommon.o /home/lool/git/denx/u-boot/obj-v-broken/disk/libdisk.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/bios_emulator/libatibiosemu.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/block/libblock.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/dma/libdma.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/fpga/libfpga.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/gpio/libgpio.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/hwmon/libhwmon.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/i2c/libi2c.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/input/libinput.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/misc/libmisc.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/mmc/libmmc.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/mtd/libmtd.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/mtd/nand/libnand.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/mtd/onenand/libonenand.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/mtd/spi/libspi_flash.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/mtd/ubi/libubi.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/net/libnet.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/net/phy/libphy.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/pci/libpci.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/pcmcia/libpcmcia.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/power/libpower.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/rtc/librtc.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/serial/libserial.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/spi/libspi.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/twserial/libtws.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/usb/eth/libusb_eth.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/usb/gadget/libusb_gadget.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/usb/host/libusb_host.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/usb/musb/libusb_musb.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/usb/phy/libusb_phy.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/video/libvideo.o /home/lool/git/denx/u-boot/obj-v-broken/drivers/watchdog/libwatchdog.o /home/lool/git/denx/u-boot/obj-v-broken/fs/cramfs/libcramfs.o /home/lool/git/denx/u-boot/obj-v-broken/fs/ext2/libext2fs.o /home/lool/git/denx/u-boot/obj-v-broken/fs/fat/libfat.o /home/lool/git/denx/u-boot/obj-v-broken/fs/fdos/libfdos.o /home/lool/git/denx/u-boot/obj-v-broken/fs/jffs2/libjffs2.o /home/lool/git/denx/u-boot/obj-v-broken/fs/reiserfs/libreiserfs.o /home/lool/git/denx/u-boot/obj-v-broken/fs/ubifs/libubifs.o /home/lool/git/denx/u-boot/obj-v-broken/fs/yaffs2/libyaffs2.o /home/lool/git/denx/u-boot/obj-v-broken/lib/libfdt/libfdt.o /home/lool/git/denx/u-boot/obj-v-broken/lib/libgeneric.o /home/lool/git/denx/u-boot/obj-v-broken/lib/lzma/liblzma.o /home/lool/git/denx/u-boot/obj-v-broken/lib/lzo/liblzo.o /home/lool/git/denx/u-boot/obj-v-broken/lib/zlib/libz.o /home/lool/git/denx/u-boot/obj-v-broken/net/libnet.o /home/lool/git/denx/u-boot/obj-v-broken/post/libpost.o | sed -n -e 's/.*\(__u_boot_cmd_.*\)/-u\1/p'|sort|uniq`; cd /home/lool/git/denx/u-boot/obj-v-broken && arm-linux-gnueabi-ld -pie -T /home/lool/git/denx/u-boot/obj-v-broken/u-boot.lds -Bstatic -Ttext 0x10000 $UNDEF_SYM arch/arm/cpu/arm926ejs/start.o --start-group api/libapi.o arch/arm/cpu/arm926ejs/libarm926ejs.o arch/arm/cpu/arm926ejs/versatile/libversatile.o arch/arm/lib/libarm.o common/libcommon.o disk/libdisk.o drivers/bios_emulator/libatibiosemu.o drivers/block/libblock.o drivers/dma/libdma.o drivers/fpga/libfpga.o drivers/gpio/libgpio.o drivers/hwmon/libhwmon.o drivers/i2c/libi2c.o drivers/input/libinput.o drivers/misc/libmisc.o drivers/mmc/libmmc.o drivers/mtd/libmtd.o drivers/mtd/nand/libnand.o drivers/mtd/onenand/libonenand.o drivers/mtd/spi/libspi_flash.o drivers/mtd/ubi/libubi.o drivers/net/libnet.o drivers/net/phy/libphy.o drivers/pci/libpci.o drivers/pcmcia/libpcmcia.o drivers/power/libpower.o drivers/rtc/librtc.o drivers/serial/libserial.o drivers/spi/libspi.o drivers/twserial/libtws.o drivers/usb/eth/libusb_eth.o drivers/usb/gadget/libusb_gadget.o drivers/usb/host/libusb_host.o drivers/usb/musb/libusb_musb.o drivers/usb/phy/libusb_phy.o drivers/video/libvideo.o drivers/watchdog/libwatchdog.o fs/cramfs/libcramfs.o fs/ext2/libext2fs.o fs/fat/libfat.o fs/fdos/libfdos.o fs/jffs2/libjffs2.o fs/reiserfs/libreiserfs.o fs/ubifs/libubifs.o fs/yaffs2/libyaffs2.o lib/libfdt/libfdt.o lib/libgeneric.o lib/lzma/liblzma.o lib/lzo/liblzo.o lib/zlib/libz.o net/libnet.o post/libpost.o board/armltd/versatile/libversatile.o --end-group /home/lool/git/denx/u-boot/obj-v-broken/arch/arm/lib/eabi_compat.o -L /usr/lib/gcc/arm-linux-gnueabi/4.6.1 -lgcc -Map u-boot.map -o u-boot
I verified that all the .o files passed above have Tag_CPU_name:
"5TE" in their arm-linux-gnueabi-readelf -A output; the only
problematic file is -lgcc.
Note that the final link is done with arm-linux-gnueabi-ld and doesn't
set any architecture; I changed it manually to use gcc and pass the
-marm -march=armv5te, and had to set -nostdlib too when using gcc:
arm-linux-gnueabi-gcc -marm -march=armv5te -nostdlib -pie -T /home/lool/git/denx/u-boot/obj-v-broken/u-boot.lds -Bstatic -Ttext 0x10000 $UNDEF_SYM arch/arm/cpu/arm926ejs/start.o -Wl,--start-group api/libapi.o arch/arm/cpu/arm926ejs/libarm926ejs.o arch/arm/cpu/arm926ejs/versatile/libversatile.o arch/arm/lib/libarm.o common/libcommon.o disk/libdisk.o drivers/bios_emulator/libatibiosemu.o drivers/block/libblock.o drivers/dma/libdma.o drivers/fpga/libfpga.o drivers/gpio/libgpio.o drivers/hwmon/libhwmon.o drivers/i2c/libi2c.o drivers/input/libinput.o drivers/misc/libmisc.o drivers/mmc/libmmc.o drivers/mtd/libmtd.o drivers/mtd/nand/libnand.o drivers/mtd/onenand/libonenand.o drivers/mtd/spi/libspi_flash.o drivers/mtd/ubi/libubi.o drivers/net/libnet.o drivers/net/phy/libphy.o drivers/pci/libpci.o drivers/pcmcia/libpcmcia.o drivers/power/libpower.o drivers/rtc/librtc.o drivers/serial/libserial.o drivers/spi/libspi.o drivers/twserial/libtws.o drivers/usb/eth/libusb_eth.o drivers/usb/gadget/libusb_gadget.o drivers/usb/host/libusb_host.o drivers/usb/musb/libusb_musb.o drivers/usb/phy/libusb_phy.o drivers/video/libvideo.o drivers/watchdog/libwatchdog.o fs/cramfs/libcramfs.o fs/ext2/libext2fs.o fs/fat/libfat.o fs/fdos/libfdos.o fs/jffs2/libjffs2.o fs/reiserfs/libreiserfs.o fs/ubifs/libubifs.o fs/yaffs2/libyaffs2.o lib/libfdt/libfdt.o lib/libgeneric.o lib/lzma/liblzma.o lib/lzo/liblzo.o lib/zlib/libz.o net/libnet.o post/libpost.o board/armltd/versatile/libversatile.o -Wl,--end-group /home/lool/git/denx/u-boot/obj-v-broken/arch/arm/lib/eabi_compat.o -L /usr/lib/gcc/arm-linux-gnueabi/4.6.1 -lgcc -Wl,-Map u-boot.map -o u-boot
But this command works and produces an u-boot ELF which has
Tag_CPU_name: "7-A".
How would I break the build when libgcc isn't ARMv5T?
Thanks,
--
Loïc Minier
