doc: gcc-plugins: update gcc-plugins.rst

This document was written a long time ago. Update it.

[1] Drop the version information

The range of the supported GCC versions are always changing. The
current minimal GCC version is 4.9, and commit 1e860048c5
("gcc-plugins: simplify GCC plugin-dev capability test") removed the
old code accordingly.

We do not need to mention specific version ranges like "all gcc versions
from 4.5 to 6.0" since we forget to update the documentation when we
raise the minimal compiler version.

[2] Drop the C compiler statements

Since commit 77342a02ff ("gcc-plugins: drop support for GCC <= 4.7")
the GCC plugin infrastructure only supports g++.

[3] Drop supported architectures

As of v5.11-rc4, the infrastructure supports more architectures;
arm, arm64, mips, powerpc, riscv, s390, um, and x86. (just grep
"select HAVE_GCC_PLUGINS") Again, we miss to update this document when a
new architecture is supported. Let's just say "only some architectures".

[4] Update the apt-get example

We are now discussing to bump the minimal version to GCC 5. The GCC 4.9
support will be removed sooner or later. Change the package example to
gcc-10-plugin-dev while we are here.

[5] Update the build target

Since commit ce2fd53a10 ("kbuild: descend into scripts/gcc-plugins/
via scripts/Makefile"), "make gcc-plugins" is not supported.
"make scripts" builds all the enabled plugins, including some other
tools.

[6] Update the steps for adding a new plugin

At first, all CONFIG options for GCC plugins were located in arch/Kconfig.
After commit 45332b1bdf ("gcc-plugins: split out Kconfig entries to
scripts/gcc-plugins/Kconfig"), scripts/gcc-plugins/Kconfig became the
central place to collect plugin CONFIG options. In my understanding,
this requirement no longer exists because commit 9f671e5815 ("security:
Create "kernel hardening" config area") moved some of plugin CONFIG
options to another file. Find an appropriate place to add the new CONFIG.

The sub-directory support was never used by anyone, and removed by
commit c17d6179ad ("gcc-plugins: remove unused GCC_PLUGIN_SUBDIR").

Remove the useless $(src)/ prefix.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
This commit is contained in:
Masahiro Yamada 2021-01-23 22:33:33 +09:00
parent f4c3b83b75
commit 9b6164342e
1 changed files with 21 additions and 20 deletions

View File

@ -11,16 +11,13 @@ compiler [1]_. They are useful for runtime instrumentation and static analysis.
We can analyse, change and add further code during compilation via
callbacks [2]_, GIMPLE [3]_, IPA [4]_ and RTL passes [5]_.
The GCC plugin infrastructure of the kernel supports all gcc versions from
4.5 to 6.0, building out-of-tree modules, cross-compilation and building in a
separate directory.
Plugin source files have to be compilable by both a C and a C++ compiler as well
because gcc versions 4.5 and 4.6 are compiled by a C compiler,
gcc-4.7 can be compiled by a C or a C++ compiler,
and versions 4.8+ can only be compiled by a C++ compiler.
The GCC plugin infrastructure of the kernel supports building out-of-tree
modules, cross-compilation and building in a separate directory.
Plugin source files have to be compilable by a C++ compiler.
Currently the GCC plugin infrastructure supports only the x86, arm, arm64 and
powerpc architectures.
Currently the GCC plugin infrastructure supports only some architectures.
Grep "select HAVE_GCC_PLUGINS" to find out which architectures support
GCC plugins.
This infrastructure was ported from grsecurity [6]_ and PaX [7]_.
@ -53,8 +50,7 @@ $(src)/scripts/gcc-plugins/gcc-generate-simple_ipa-pass.h,
$(src)/scripts/gcc-plugins/gcc-generate-rtl-pass.h**
These headers automatically generate the registration structures for
GIMPLE, SIMPLE_IPA, IPA and RTL passes. They support all gcc versions
from 4.5 to 6.0.
GIMPLE, SIMPLE_IPA, IPA and RTL passes.
They should be preferred to creating the structures by hand.
@ -62,21 +58,25 @@ Usage
=====
You must install the gcc plugin headers for your gcc version,
e.g., on Ubuntu for gcc-4.9::
e.g., on Ubuntu for gcc-10::
apt-get install gcc-4.9-plugin-dev
apt-get install gcc-10-plugin-dev
Or on Fedora::
dnf install gcc-plugin-devel
Enable a GCC plugin based feature in the kernel config::
Enable the GCC plugin infrastructure and some plugin(s) you want to use
in the kernel config::
CONFIG_GCC_PLUGIN_CYC_COMPLEXITY = y
CONFIG_GCC_PLUGINS=y
CONFIG_GCC_PLUGIN_CYC_COMPLEXITY=y
CONFIG_GCC_PLUGIN_LATENT_ENTROPY=y
...
To compile only the plugin(s)::
To compile the minimum tool set including the plugin(s)::
make gcc-plugins
make scripts
or just run the kernel make and compile the whole kernel with
the cyclomatic complexity GCC plugin.
@ -85,7 +85,8 @@ the cyclomatic complexity GCC plugin.
4. How to add a new GCC plugin
==============================
The GCC plugins are in $(src)/scripts/gcc-plugins/. You can use a file or a directory
here. It must be added to $(src)/scripts/gcc-plugins/Makefile,
$(src)/scripts/Makefile.gcc-plugins and $(src)/arch/Kconfig.
The GCC plugins are in scripts/gcc-plugins/. You need to put plugin source files
right under scripts/gcc-plugins/. Creating subdirectories is not supported.
It must be added to scripts/gcc-plugins/Makefile, scripts/Makefile.gcc-plugins
and a relevant Kconfig file.
See the cyc_complexity_plugin.c (CONFIG_GCC_PLUGIN_CYC_COMPLEXITY) GCC plugin.