On Mon, Dec 5, 2016 at 10:28 PM, Andrew Donnellan
<andrew.donnellan@xxxxxxxxxxx> wrote:
> Enable support for GCC plugins on powerpc.
>
> Add an additional version check in gcc-plugins-check to advise users to
> upgrade to gcc 5.2+ on powerpc to avoid issues with header files (gcc <=
> 4.6) or missing copies of rs6000-cpus.def (4.8 to 5.1 on 64-bit targets).
>
> Signed-off-by: Andrew Donnellan <andrew.donnellan@xxxxxxxxxxx>
>
> ---
>
> Open to bikeshedding on the gcc version check.
I think this looks fine. Anyone wanting to use gcc plugins on ppc with
an earlier gcc can send patches if they find a sane way to make it
work. :)
> Compile tested with all plugins enabled on gcc 4.6-6.2,
> x86->ppc{32,64,64le} and 4.8-6.2 ppc64le->ppc{32,64,64le}. Thanks to
> Chris Smart for help with this.
I assume also tested on 5.2? :)
> I think it's best to take this through powerpc#next with an ACK from
> Kees/Emese?
That would be fine by me. Please consider the whole series:
Acked-by: Kees Cook <keescook@xxxxxxxxxxxx>
Thanks!
-Kees
> ---
> arch/powerpc/Kconfig | 1 +
> scripts/Makefile.gcc-plugins | 8 ++++++++
> 2 files changed, 9 insertions(+)
>
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index 65fba4c..6efbc08 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -92,6 +92,7 @@ config PPC
> select HAVE_DYNAMIC_FTRACE_WITH_REGS if MPROFILE_KERNEL
> select HAVE_FUNCTION_TRACER
> select HAVE_FUNCTION_GRAPH_TRACER
> + select HAVE_GCC_PLUGINS
> select SYSCTL_EXCEPTION_TRACE
> select VIRT_TO_BUS if !PPC64
> select HAVE_IDE
> diff --git a/scripts/Makefile.gcc-plugins b/scripts/Makefile.gcc-plugins
> index 26c67b7..9835a75 100644
> --- a/scripts/Makefile.gcc-plugins
> +++ b/scripts/Makefile.gcc-plugins
> @@ -47,6 +47,14 @@ gcc-plugins-check: FORCE
> ifdef CONFIG_GCC_PLUGINS
> ifeq ($(PLUGINCC),)
> ifneq ($(GCC_PLUGINS_CFLAGS),)
> + # Various gccs between 4.5 and 5.1 have bugs on powerpc due to missing
> + # header files. gcc <= 4.6 doesn't work at all, gccs from 4.8 to 5.1 have
> + # issues with 64-bit targets.
> + ifeq ($(ARCH),powerpc)
> + ifeq ($(call cc-ifversion, -le, 0501, y), y)
> + @echo "Cannot use CONFIG_GCC_PLUGINS: plugin support on gcc <= 5.1 is buggy on powerpc, please upgrade to gcc 5.2 or newer" >&2 && exit 1
> + endif
> + endif
> ifeq ($(call cc-ifversion, -ge, 0405, y), y)
> $(Q)$(srctree)/scripts/gcc-plugin.sh --show-error "$(__PLUGINCC)" "$(HOSTCXX)" "$(CC)" || true
> @echo "Cannot use CONFIG_GCC_PLUGINS: your gcc installation does not support plugins, perhaps the necessary headers are missing?" >&2 && exit 1
> --
> Andrew Donnellan OzLabs, ADL Canberra
> andrew.donnellan@xxxxxxxxxxx IBM Australia Limited
>
--
Kees Cook
Nexus Security
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