Re: [Xen-devel] Xen GCC coverage ARM64 testing - Unexpected Trap: Data Abort

[Viktor Mitin <viktor.mitin.19@xxxxxxxxx>]

> > aarch64-poky-linux-gcc   -DBUILD_ID -fno-strict-aliasing -std=gnu99
> > -Wall -Wstrict-prototypes -Wdeclaration-after-statement
> > -Wno-unused-but-set-variable -Wno-unused-local-typedefs   -O2
> > -fomit-frame-pointer
> > -D__XEN_INTERFACE_VERSION__=__XEN_LATEST_INTERFACE_VERSION__ -MMD -MF
> > .handlereg.o.d -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE   -Werror
> > -Wmissing-prototypes -I./include
> > -I/home/c/w/rcar_h3_ubuntu1604_yocto/build/tmp/work/aarch64-poky-linux/xen/4.12.0.0+gitAUTOINC+fd2a34c965-r0/git/tools/libs/toolcore/../../../tools/include
> >   -c -o handlereg.o handlereg.c
>
> ... this looks like a tool building error when I only touch the
> hypervisor part. Are you certain this is my patch and not another error
> in Xen 4.12 (or any patch you have on top)?

Julien, you are right, it was local environment build issue (sorry for that).
Xen GCC coverage feature works well with Aarch64 with this patch.
Checked both commands, xencov read and xencov reset - both work well
(no crashes anymore).

Please also note that use case mentioned in Xen documentation
(xencov_split) is also ok with generated coverage.dat input:
xen.git/xen$ ssh root@host xencov read > coverage.dat
xen.git/xen$ ../tools/xencov_split coverage.dat --output-dir=/
xen.git/xen$ geninfo . -o cov.info
xen.git/xen$ genhtml cov.info -o cov/
xen.git/xen$ $BROWSER cov/index.html

--------
Minor observation about coverage build procedure. Documentation states:
"To build with coverage support, enable CONFIG_COVERAGE in Kconfig."
However, to build it properly, it needs to enable coverage feature in
two places - main xen make command line and hypervisor .config file.
Is it expected way to build xen with coverage feature? If yes,
probably we should improve (or at least document) it some day...

Thanks

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