This patch set introduce the GCC plugin infrastructure with examples for testing
and documentation.
GCC plugins are loadable modules that provide extra features to the compiler.
They are useful for runtime instrumentation and static analysis.
The infrastructure supports all gcc versions from 4.5 to 6.0, building
out-of-tree modules and building in a separate directory. Cross-compilation
is supported too but currently only the x86, arm and arm64 architectures enables plugins.
This infrastructure was ported from grsecurity/PaX. It is a CII project
supported by the Linux Foundation.
Emese Revfy (6):
Shared library support
GCC plugin infrastructure
The GCC plugin infrastructure supports the arm and arm64 architectures too
Add Cyclomatic complexity plugin
Documentations of the GCC plugin infrastructre
Add sancov plugin
Changes from v6:
* Disable the sancov plugin whenever KCOV_INSTRUMENT is disabled
(Reported-by: Huang Ying <[email protected]>)
* Disable KCOV/sancov plugin because this is not a regular kernel code
(Reported-by: Huang Ying <[email protected]>)
* Removed unnecessary gcc plugin cflags
(Signed-off-by: Masahiro Yamada <[email protected]>)
* Removed unnecessary gcc plugin aflags
Changes from v5:
* Set important properties on the external fndecl (Add sancov plugin)
* Revert documentation change too (Shared library support)
(Suggested-by: Kees Cook <[email protected]>)
* The GCC plugin infrastructure now supports the arm and arm64 architectures too
(Signed-off-by: David Brown <[email protected]>)
* Simplify the computation of PLUGINCC (GCC plugin infrastructure)
(Suggested-by: Masahiro Yamada <[email protected]>)
* Simplify the invocation of gcc-plugin.sh (GCC plugin infrastructure)
(Suggested-by: Masahiro Yamada <[email protected]>)
* Make use of multi-depend (Shared library support)
(Suggested-by: Masahiro Yamada <[email protected]>)
* Remove unnecessary exports (GCC plugin infrastructure)
(Suggested-by: Masahiro Yamada <[email protected]>)
* Simplify Makefile by using addprefix (GCC plugin infrastructure)
(Suggested-by: Masahiro Yamada <[email protected]>)
* Moved the gcc plugins from tools/ to scripts/ (GCC plugin infrastructure)
(Suggested-by: Masahiro Yamada <[email protected]>)
* Removed plugins from KBUILD_CFLAGS_32 (GCC plugin infrastructure)
* Remove gcc-plugin target everywhere
(Suggested-by and partly Written-by: Masahiro Yamada <[email protected]>)
* There is no leaf gcc attribute in gcc-4.5 (Add sancov plugin)
* Added support to the sancov plugin with kcov (Add sancov plugin)
Changes from v4:
* Moved shared library support from the GCC plugin infrastructure patch into
a different patch
* Update gcc-*.h from PaX
* Fixed gcc-common.h for gcc 6
* Added pass cloning support to the gcc pass generators
* Disable all plugins in vdso because it is userland code
* Add sancov gcc plugin: another use case for gcc plugin support in the kernel
is when there is a feature in the latest gcc version and we would like to use
it with older gcc versions as well (e.g., distros).
Changes from v3:
* Fix some indentation related warnings
(Suggested by checkpatch.pl)
* Add maintainer entries
* Don't run gcc_plugin.sh when the GCC_PLUGINS option is disabled or unsupported
(Reported-by: Fengguang Wu <[email protected]>)
Changes from v2:
* Fixed incorrectly encoded characters
* Generate the GIMPLE, IPA, SIMPLE_IPA and RTL pass structures
(Suggested-by: Rasmus Villemoes <[email protected]>)
* Write plugin related warning messages to stderr instead of stdout
(Suggested-by: Kees Cook <[email protected]>)
* Mention the installation of the gcc plugin headers (Documentation)
Changes from v1:
* Move the gcc-plugins make target into a separate Makefile because there may
be a lot of plugins (Suggested-by: Rasmus Villemoes)
* Simplify the dependencies of the plugin related config option
(Suggested-by: Kees Cook <[email protected]>)
* Removed the unnecessary example plugin
---
Documentation/dontdiff | 1 +
Documentation/gcc-plugins.txt | 83 +++
Documentation/kbuild/makefiles.txt | 39 +-
Documentation/kernel-parameters.txt | 5 +
MAINTAINERS | 8 +
Makefile | 25 +-
arch/Kconfig | 36 +
arch/arm/Kconfig | 1 +
arch/arm64/Kconfig | 1 +
arch/x86/Kconfig | 1 +
arch/x86/entry/vdso/Makefile | 3 +-
arch/x86/purgatory/Makefile | 2 +
lib/Kconfig.debug | 2 +
scripts/Makefile | 2 +-
scripts/Makefile.build | 2 +-
scripts/Makefile.clean | 3 +-
scripts/Makefile.gcc-plugins | 40 +
scripts/Makefile.host | 70 +-
scripts/gcc-plugin.sh | 51 ++
scripts/gcc-plugins/Makefile | 24 +
scripts/gcc-plugins/cyc_complexity_plugin.c | 73 ++
scripts/gcc-plugins/gcc-common.h | 830 +++++++++++++++++++++
scripts/gcc-plugins/gcc-generate-gimple-pass.h | 175 +++++
scripts/gcc-plugins/gcc-generate-ipa-pass.h | 289 +++++++
scripts/gcc-plugins/gcc-generate-rtl-pass.h | 175 +++++
scripts/gcc-plugins/gcc-generate-simple_ipa-pass.h | 175 +++++
scripts/gcc-plugins/sancov_plugin.c | 144 ++++
scripts/link-vmlinux.sh | 2 +-
scripts/package/builddeb | 1 +
29 files changed, 2239 insertions(+), 25 deletions(-)
Infrastructure for building independent shared library targets.
This effectively also reverts commit 62e2210798ed38928ab24841e8b4878a
(Masahiro Yamada, kbuild: drop shared library support from Makefile.host).
Signed-off-by: Emese Revfy <[email protected]>
---
Documentation/kbuild/makefiles.txt | 39 ++++++++++++++++-----
scripts/Makefile.build | 2 +-
scripts/Makefile.clean | 3 +-
scripts/Makefile.host | 70 +++++++++++++++++++++++++++++++++++++-
4 files changed, 103 insertions(+), 11 deletions(-)
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index 13f888a..250729b 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -23,10 +23,11 @@ This document describes the Linux kernel Makefiles.
=== 4 Host Program support
--- 4.1 Simple Host Program
--- 4.2 Composite Host Programs
- --- 4.3 Using C++ for host programs
- --- 4.4 Controlling compiler options for host programs
- --- 4.5 When host programs are actually built
- --- 4.6 Using hostprogs-$(CONFIG_FOO)
+ --- 4.3 Defining shared libraries
+ --- 4.4 Using C++ for host programs
+ --- 4.5 Controlling compiler options for host programs
+ --- 4.6 When host programs are actually built
+ --- 4.7 Using hostprogs-$(CONFIG_FOO)
=== 5 Kbuild clean infrastructure
@@ -643,7 +644,29 @@ Both possibilities are described in the following.
Finally, the two .o files are linked to the executable, lxdialog.
Note: The syntax <executable>-y is not permitted for host-programs.
---- 4.3 Using C++ for host programs
+--- 4.3 Defining shared libraries
+
+ Objects with extension .so are considered shared libraries, and
+ will be compiled as position independent objects.
+ Kbuild provides support for shared libraries, but the usage
+ shall be restricted.
+ In the following example the libkconfig.so shared library is used
+ to link the executable conf.
+
+ Example:
+ #scripts/kconfig/Makefile
+ hostprogs-y := conf
+ conf-objs := conf.o libkconfig.so
+ libkconfig-objs := expr.o type.o
+
+ Shared libraries always require a corresponding -objs line, and
+ in the example above the shared library libkconfig is composed by
+ the two objects expr.o and type.o.
+ expr.o and type.o will be built as position independent code and
+ linked as a shared library libkconfig.so. C++ is not supported for
+ shared libraries.
+
+--- 4.4 Using C++ for host programs
kbuild offers support for host programs written in C++. This was
introduced solely to support kconfig, and is not recommended
@@ -666,7 +689,7 @@ Both possibilities are described in the following.
qconf-cxxobjs := qconf.o
qconf-objs := check.o
---- 4.4 Controlling compiler options for host programs
+--- 4.5 Controlling compiler options for host programs
When compiling host programs, it is possible to set specific flags.
The programs will always be compiled utilising $(HOSTCC) passed
@@ -694,7 +717,7 @@ Both possibilities are described in the following.
When linking qconf, it will be passed the extra option
"-L$(QTDIR)/lib".
---- 4.5 When host programs are actually built
+--- 4.6 When host programs are actually built
Kbuild will only build host-programs when they are referenced
as a prerequisite.
@@ -725,7 +748,7 @@ Both possibilities are described in the following.
This will tell kbuild to build lxdialog even if not referenced in
any rule.
---- 4.6 Using hostprogs-$(CONFIG_FOO)
+--- 4.7 Using hostprogs-$(CONFIG_FOO)
A typical pattern in a Kbuild file looks like this:
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 0d1ca5b..11602e5 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -60,7 +60,7 @@ endif
endif
# Do not include host rules unless needed
-ifneq ($(hostprogs-y)$(hostprogs-m),)
+ifneq ($(hostprogs-y)$(hostprogs-m)$(hostlibs-y)$(hostlibs-m)$(hostcxxlibs-y)$(hostcxxlibs-m),)
include scripts/Makefile.host
endif
diff --git a/scripts/Makefile.clean b/scripts/Makefile.clean
index 55c96cb..e4e88ab 100644
--- a/scripts/Makefile.clean
+++ b/scripts/Makefile.clean
@@ -38,7 +38,8 @@ subdir-ymn := $(addprefix $(obj)/,$(subdir-ymn))
__clean-files := $(extra-y) $(extra-m) $(extra-) \
$(always) $(targets) $(clean-files) \
$(host-progs) \
- $(hostprogs-y) $(hostprogs-m) $(hostprogs-)
+ $(hostprogs-y) $(hostprogs-m) $(hostprogs-) \
+ $(hostlibs-y) $(hostlibs-m) $(hostlibs-)
__clean-files := $(filter-out $(no-clean-files), $(__clean-files))
diff --git a/scripts/Makefile.host b/scripts/Makefile.host
index 133edfa..3439bd8 100644
--- a/scripts/Makefile.host
+++ b/scripts/Makefile.host
@@ -20,7 +20,25 @@
# Will compile qconf as a C++ program, and menu as a C program.
# They are linked as C++ code to the executable qconf
+# hostprogs-y := conf
+# conf-objs := conf.o libkconfig.so
+# libkconfig-objs := expr.o type.o
+# Will create a shared library named libkconfig.so that consists of
+# expr.o and type.o (they are both compiled as C code and the object files
+# are made as position independent code).
+# conf.c is compiled as a C program, and conf.o is linked together with
+# libkconfig.so as the executable conf.
+# Note: Shared libraries consisting of C++ files are not supported
+
+# hostcc-option
+# Usage: cflags-y += $(call hostcc-option,-march=winchip-c6,-march=i586)
+
+hostcc-option = $(call try-run,\
+ $(HOSTCC) $(HOSTCFLAGS) $(HOST_EXTRACFLAGS) $(1) -c -x c /dev/null -o "$$TMP",$(1),$(2))
+
__hostprogs := $(sort $(hostprogs-y) $(hostprogs-m))
+__hostlibs := $(sort $(hostlibs-y) $(hostlibs-m))
+__hostcxxlibs := $(sort $(hostcxxlibs-y) $(hostcxxlibs-m))
# C code
# Executables compiled from a single .c file
@@ -42,6 +60,18 @@ host-cxxmulti := $(foreach m,$(__hostprogs),$(if $($(m)-cxxobjs),$(m)))
# C++ Object (.o) files compiled from .cc files
host-cxxobjs := $(sort $(foreach m,$(host-cxxmulti),$($(m)-cxxobjs)))
+# Shared libaries (only .c supported)
+# Shared libraries (.so) - all .so files referenced in "xxx-objs"
+host-cshlib := $(sort $(filter %.so, $(__hostlibs)))
+host-cxxshlib := $(sort $(filter %.so, $(__hostcxxlibs)))
+# Remove .so files from "xxx-objs"
+host-cobjs := $(filter-out %.so,$(host-cobjs))
+host-cxxobjs := $(filter-out %.so,$(host-cxxobjs))
+
+# Object (.o) files used by the shared libaries
+host-cshobjs := $(sort $(foreach m,$(host-cshlib),$($(m:.so=-objs))))
+host-cxxshobjs := $(sort $(foreach m,$(host-cxxshlib),$($(m:.so=-objs))))
+
# output directory for programs/.o files
# hostprogs-y := tools/build may have been specified.
# Retrieve also directory of .o files from prog-objs or prog-cxxobjs notation
@@ -56,6 +86,10 @@ host-cmulti := $(addprefix $(obj)/,$(host-cmulti))
host-cobjs := $(addprefix $(obj)/,$(host-cobjs))
host-cxxmulti := $(addprefix $(obj)/,$(host-cxxmulti))
host-cxxobjs := $(addprefix $(obj)/,$(host-cxxobjs))
+host-cshlib := $(addprefix $(obj)/,$(host-cshlib))
+host-cxxshlib := $(addprefix $(obj)/,$(host-cxxshlib))
+host-cshobjs := $(addprefix $(obj)/,$(host-cshobjs))
+host-cxxshobjs := $(addprefix $(obj)/,$(host-cxxshobjs))
host-objdirs := $(addprefix $(obj)/,$(host-objdirs))
obj-dirs += $(host-objdirs)
@@ -124,5 +158,39 @@ quiet_cmd_host-cxxobjs = HOSTCXX $@
$(host-cxxobjs): $(obj)/%.o: $(src)/%.cc FORCE
$(call if_changed_dep,host-cxxobjs)
+# Compile .c file, create position independent .o file
+# host-cshobjs -> .o
+quiet_cmd_host-cshobjs = HOSTCC -fPIC $@
+ cmd_host-cshobjs = $(HOSTCC) $(hostc_flags) -fPIC -c -o $@ $<
+$(host-cshobjs): $(obj)/%.o: $(src)/%.c FORCE
+ $(call if_changed_dep,host-cshobjs)
+
+# Compile .c file, create position independent .o file
+# host-cxxshobjs -> .o
+quiet_cmd_host-cxxshobjs = HOSTCXX -fPIC $@
+ cmd_host-cxxshobjs = $(HOSTCXX) $(hostcxx_flags) -fPIC -c -o $@ $<
+$(host-cxxshobjs): $(obj)/%.o: $(src)/%.c FORCE
+ $(call if_changed_dep,host-cxxshobjs)
+
+# Link a shared library, based on position independent .o files
+# *.o -> .so shared library (host-cshlib)
+quiet_cmd_host-cshlib = HOSTLLD -shared $@
+ cmd_host-cshlib = $(HOSTCC) $(HOSTLDFLAGS) -shared -o $@ \
+ $(addprefix $(obj)/,$($(@F:.so=-objs))) \
+ $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
+$(host-cshlib): FORCE
+ $(call if_changed,host-cshlib)
+$(call multi_depend, $(host-cshlib), .so, -objs -cshobjs)
+
+# Link a shared library, based on position independent .o files
+# *.o -> .so shared library (host-cxxshlib)
+quiet_cmd_host-cxxshlib = HOSTLLD -shared $@
+ cmd_host-cxxshlib = $(HOSTCXX) $(HOSTLDFLAGS) -shared -o $@ \
+ $(addprefix $(obj)/,$($(@F:.so=-objs))) \
+ $(HOST_LOADLIBES) $(HOSTLOADLIBES_$(@F))
+$(host-cxxshlib): FORCE
+ $(call if_changed,host-cxxshlib)
+$(call multi_depend, $(host-cxxshlib), .so, -objs -cxxshobjs)
+
targets += $(host-csingle) $(host-cmulti) $(host-cobjs)\
- $(host-cxxmulti) $(host-cxxobjs)
+ $(host-cxxmulti) $(host-cxxobjs) $(host-cshlib) $(host-cshobjs) $(host-cxxshlib) $(host-cxxshobjs)
--
2.4.1
This patch allows to build the whole kernel with GCC plugins. It was ported from
grsecurity/PaX. The infrastructure supports building out-of-tree modules and
building in a separate directory. Cross-compilation is supported too but
currently only the x86 architecture enables plugins.
The directory of the gcc plugins is tools/gcc. You can use a file or a directory
there. The plugins compile with these options:
* -fno-rtti: gcc is compiled with this option so the plugins must use it too
* -fno-exceptions: this is inherited from gcc too
* -fasynchronous-unwind-tables: this is inherited from gcc too
* -ggdb: it is useful for debugging a plugin (better backtrace on internal
errors)
* -Wno-narrowing: to suppress warnings from gcc headers (ipa-utils.h)
* -Wno-unused-variable: to suppress warnings from gcc headers (gcc_version
variable, plugin-version.h)
The infrastructure introduces a new Makefile target called gcc-plugins. It
supports all gcc versions from 4.5 to 6.0. The scripts/gcc-plugin.sh script
chooses the proper host compiler (gcc-4.7 can be built by either gcc or g++).
This script also checks the availability of the included headers in
tools/gcc/gcc-common.h.
The gcc-common.h header contains frequently included headers for GCC plugins
and it has a compatibility layer for the supported gcc versions.
The gcc-generate-*-pass.h headers automatically generate the registration
structures for GIMPLE, SIMPLE_IPA, IPA and RTL passes.
Note that 'make clean' keeps the *.so files (only the distclean or mrproper
targets clean all) because they are needed for out-of-tree modules.
Signed-off-by: Emese Revfy <[email protected]>
---
Documentation/dontdiff | 1 +
MAINTAINERS | 8 +
Makefile | 17 +-
arch/Kconfig | 13 +
arch/x86/Kconfig | 1 +
arch/x86/entry/vdso/Makefile | 3 +-
scripts/Makefile | 2 +-
scripts/Makefile.gcc-plugins | 20 +
scripts/gcc-plugin.sh | 51 ++
scripts/gcc-plugins/Makefile | 15 +
scripts/gcc-plugins/gcc-common.h | 830 +++++++++++++++++++++
scripts/gcc-plugins/gcc-generate-gimple-pass.h | 175 +++++
scripts/gcc-plugins/gcc-generate-ipa-pass.h | 289 +++++++
scripts/gcc-plugins/gcc-generate-rtl-pass.h | 175 +++++
scripts/gcc-plugins/gcc-generate-simple_ipa-pass.h | 175 +++++
scripts/link-vmlinux.sh | 2 +-
scripts/package/builddeb | 1 +
17 files changed, 1772 insertions(+), 6 deletions(-)
create mode 100644 scripts/Makefile.gcc-plugins
create mode 100755 scripts/gcc-plugin.sh
create mode 100644 scripts/gcc-plugins/Makefile
create mode 100644 scripts/gcc-plugins/gcc-common.h
create mode 100644 scripts/gcc-plugins/gcc-generate-gimple-pass.h
create mode 100644 scripts/gcc-plugins/gcc-generate-ipa-pass.h
create mode 100644 scripts/gcc-plugins/gcc-generate-rtl-pass.h
create mode 100644 scripts/gcc-plugins/gcc-generate-simple_ipa-pass.h
diff --git a/Documentation/dontdiff b/Documentation/dontdiff
index 8ea834f..5385cba 100644
--- a/Documentation/dontdiff
+++ b/Documentation/dontdiff
@@ -3,6 +3,7 @@
*.bc
*.bin
*.bz2
+*.c.[012]*.*
*.cis
*.cpio
*.csp
diff --git a/MAINTAINERS b/MAINTAINERS
index e12a27c..de91d6c 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4777,6 +4777,14 @@ L: [email protected]
S: Odd Fixes (e.g., new signatures)
F: drivers/scsi/fdomain.*
+GCC PLUGINS
+M: Kees Cook <[email protected]>
+R: Emese Revfy <[email protected]>
+L: [email protected]
+S: Maintained
+F: scripts/gcc-plugins/
+F: Documentation/gcc-plugins.txt
+
GCOV BASED KERNEL PROFILING
M: Peter Oberparleiter <[email protected]>
S: Maintained
diff --git a/Makefile b/Makefile
index c3937c5..22f0e1b 100644
--- a/Makefile
+++ b/Makefile
@@ -418,6 +418,8 @@ export KBUILD_AFLAGS_MODULE KBUILD_CFLAGS_MODULE KBUILD_LDFLAGS_MODULE
export KBUILD_AFLAGS_KERNEL KBUILD_CFLAGS_KERNEL
export KBUILD_ARFLAGS
+export PLUGINCC GCC_PLUGINS_CFLAGS
+
# When compiling out-of-tree modules, put MODVERDIR in the module
# tree rather than in the kernel tree. The kernel tree might
# even be read-only.
@@ -548,7 +550,7 @@ ifeq ($(KBUILD_EXTMOD),)
# in parallel
PHONY += scripts
scripts: scripts_basic include/config/auto.conf include/config/tristate.conf \
- asm-generic
+ asm-generic gcc-plugins
$(Q)$(MAKE) $(build)=$(@)
# Objects we will link into vmlinux / subdirs we need to visit
@@ -623,6 +625,15 @@ endif
# Tell gcc to never replace conditional load with a non-conditional one
KBUILD_CFLAGS += $(call cc-option,--param=allow-store-data-races=0)
+PHONY += gcc-plugins
+gcc-plugins: scripts_basic
+ifdef CONFIG_GCC_PLUGINS
+ $(Q)$(MAKE) $(build)=scripts/gcc-plugins
+endif
+ @:
+
+include scripts/Makefile.gcc-plugins
+
ifdef CONFIG_READABLE_ASM
# Disable optimizations that make assembler listings hard to read.
# reorder blocks reorders the control in the function
@@ -1018,7 +1029,7 @@ prepare1: prepare2 $(version_h) include/generated/utsrelease.h \
archprepare: archheaders archscripts prepare1 scripts_basic
-prepare0: archprepare
+prepare0: archprepare gcc-plugins FORCE
$(Q)$(MAKE) $(build)=.
# All the preparing..
@@ -1275,7 +1286,7 @@ distclean: mrproper
@find $(srctree) $(RCS_FIND_IGNORE) \
\( -name '*.orig' -o -name '*.rej' -o -name '*~' \
-o -name '*.bak' -o -name '#*#' -o -name '.*.orig' \
- -o -name '.*.rej' -o -name '*%' -o -name 'core' \) \
+ -o -name '.*.rej' -o -name '*.so' -o -name '*%' -o -name 'core' \) \
-type f -print | xargs rm -f
diff --git a/arch/Kconfig b/arch/Kconfig
index 0f298f9..7c12571 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -353,6 +353,19 @@ config SECCOMP_FILTER
See Documentation/prctl/seccomp_filter.txt for details.
+config HAVE_GCC_PLUGINS
+ bool
+ help
+ An arch should select this symbol if it supports building with
+ GCC plugins.
+
+menuconfig GCC_PLUGINS
+ bool "GCC plugins"
+ depends on HAVE_GCC_PLUGINS
+ help
+ GCC plugins are loadable modules that provide extra features to the
+ compiler. They are useful for runtime instrumentation and static analysis.
+
config HAVE_CC_STACKPROTECTOR
bool
help
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 2632f60..ec45b7e 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -155,6 +155,7 @@ config X86
select SYSCTL_EXCEPTION_TRACE
select USER_STACKTRACE_SUPPORT
select VIRT_TO_BUS
+ select HAVE_GCC_PLUGINS
select X86_DEV_DMA_OPS if X86_64
select X86_FEATURE_NAMES if PROC_FS
select HAVE_STACK_VALIDATION if X86_64
diff --git a/arch/x86/entry/vdso/Makefile b/arch/x86/entry/vdso/Makefile
index 253b72e..f912316 100644
--- a/arch/x86/entry/vdso/Makefile
+++ b/arch/x86/entry/vdso/Makefile
@@ -75,7 +75,7 @@ CFL := $(PROFILING) -mcmodel=small -fPIC -O2 -fasynchronous-unwind-tables -m64 \
-fno-omit-frame-pointer -foptimize-sibling-calls \
-DDISABLE_BRANCH_PROFILING -DBUILD_VDSO
-$(vobjs): KBUILD_CFLAGS += $(CFL)
+$(vobjs): KBUILD_CFLAGS := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS)) $(CFL)
#
# vDSO code runs in userspace and -pg doesn't help with profiling anyway.
@@ -145,6 +145,7 @@ KBUILD_CFLAGS_32 := $(filter-out -m64,$(KBUILD_CFLAGS))
KBUILD_CFLAGS_32 := $(filter-out -mcmodel=kernel,$(KBUILD_CFLAGS_32))
KBUILD_CFLAGS_32 := $(filter-out -fno-pic,$(KBUILD_CFLAGS_32))
KBUILD_CFLAGS_32 := $(filter-out -mfentry,$(KBUILD_CFLAGS_32))
+KBUILD_CFLAGS_32 := $(filter-out $(GCC_PLUGINS_CFLAGS),$(KBUILD_CFLAGS_32))
KBUILD_CFLAGS_32 += -m32 -msoft-float -mregparm=0 -fpic
KBUILD_CFLAGS_32 += $(call cc-option, -fno-stack-protector)
KBUILD_CFLAGS_32 += $(call cc-option, -foptimize-sibling-calls)
diff --git a/scripts/Makefile b/scripts/Makefile
index 822ab4a..1d80897 100644
--- a/scripts/Makefile
+++ b/scripts/Makefile
@@ -47,4 +47,4 @@ subdir-$(CONFIG_DTC) += dtc
subdir-$(CONFIG_GDB_SCRIPTS) += gdb
# Let clean descend into subdirs
-subdir- += basic kconfig package
+subdir- += basic kconfig package gcc-plugins
diff --git a/scripts/Makefile.gcc-plugins b/scripts/Makefile.gcc-plugins
new file mode 100644
index 0000000..e6d66e2
--- /dev/null
+++ b/scripts/Makefile.gcc-plugins
@@ -0,0 +1,20 @@
+ifdef CONFIG_GCC_PLUGINS
+ __PLUGINCC := $(call cc-ifversion, -ge, 0408, $(HOSTCXX), $(HOSTCC))
+ PLUGINCC := $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-plugin.sh "$(__PLUGINCC)" "$(HOSTCXX)" "$(CC)")
+
+ GCC_PLUGINS_CFLAGS := $(addprefix -fplugin=$(objtree)/scripts/gcc-plugins/, $(gcc-plugin-y))
+
+ ifeq ($(PLUGINCC),)
+ ifneq ($(GCC_PLUGINS_CFLAGS),)
+ ifeq ($(call cc-ifversion, -ge, 0405, y), y)
+ PLUGINCC := $(shell $(CONFIG_SHELL) -x $(srctree)/scripts/gcc-plugin.sh "$(__PLUGINCC)" "$(HOSTCXX)" "$(CC)")
+ $(error error, your gcc installation does not support plugins, perhaps the necessary headers are missing?)
+ else
+ $(error error, your gcc version does not support plugins, you should upgrade it to gcc 4.5 at least)
+ endif
+ endif
+ endif
+
+ KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
+
+endif
diff --git a/scripts/gcc-plugin.sh b/scripts/gcc-plugin.sh
new file mode 100755
index 0000000..fb92075
--- /dev/null
+++ b/scripts/gcc-plugin.sh
@@ -0,0 +1,51 @@
+#!/bin/sh
+srctree=$(dirname "$0")
+gccplugins_dir=$($3 -print-file-name=plugin)
+plugincc=$($1 -E -x c++ - -o /dev/null -I"${srctree}"/gcc-plugins -I"${gccplugins_dir}"/include 2>&1 <<EOF
+#include "gcc-common.h"
+#if BUILDING_GCC_VERSION >= 4008 || defined(ENABLE_BUILD_WITH_CXX)
+#warning $2 CXX
+#else
+#warning $1 CC
+#endif
+EOF
+)
+
+if [ $? -ne 0 ]
+then
+ exit 1
+fi
+
+case "$plugincc" in
+ *"$1 CC"*)
+ echo "$1"
+ exit 0
+ ;;
+
+ *"$2 CXX"*)
+ # the c++ compiler needs another test, see below
+ ;;
+
+ *)
+ exit 1
+ ;;
+esac
+
+# we need a c++ compiler that supports the designated initializer GNU extension
+plugincc=$($2 -c -x c++ -std=gnu++98 - -fsyntax-only -I"${srctree}"/gcc-plugins -I"${gccplugins_dir}"/include 2>&1 <<EOF
+#include "gcc-common.h"
+class test {
+public:
+ int test;
+} test = {
+ .test = 1
+};
+EOF
+)
+
+if [ $? -eq 0 ]
+then
+ echo "$2"
+ exit 0
+fi
+exit 1
diff --git a/scripts/gcc-plugins/Makefile b/scripts/gcc-plugins/Makefile
new file mode 100644
index 0000000..b2d64af
--- /dev/null
+++ b/scripts/gcc-plugins/Makefile
@@ -0,0 +1,15 @@
+GCC_PLUGINS_DIR := $(shell $(CC) -print-file-name=plugin)
+
+ifeq ($(PLUGINCC),$(HOSTCC))
+HOSTLIBS := hostlibs
+HOST_EXTRACFLAGS += -I$(GCC_PLUGINS_DIR)/include -I$(src) -std=gnu99 -ggdb
+export HOST_EXTRACFLAGS
+else
+HOSTLIBS := hostcxxlibs
+HOST_EXTRACXXFLAGS += -I$(GCC_PLUGINS_DIR)/include -I$(src) -std=gnu++98 -fno-rtti -fno-exceptions -fasynchronous-unwind-tables -ggdb -Wno-narrowing -Wno-unused-variable
+export HOST_EXTRACXXFLAGS
+endif
+
+export GCCPLUGINS_DIR HOSTLIBS
+
+always := $($(HOSTLIBS)-y)
diff --git a/scripts/gcc-plugins/gcc-common.h b/scripts/gcc-plugins/gcc-common.h
new file mode 100644
index 0000000..172850b
--- /dev/null
+++ b/scripts/gcc-plugins/gcc-common.h
@@ -0,0 +1,830 @@
+#ifndef GCC_COMMON_H_INCLUDED
+#define GCC_COMMON_H_INCLUDED
+
+#include "bversion.h"
+#if BUILDING_GCC_VERSION >= 6000
+#include "gcc-plugin.h"
+#else
+#include "plugin.h"
+#endif
+#include "plugin-version.h"
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "tm.h"
+#include "line-map.h"
+#include "input.h"
+#include "tree.h"
+
+#include "tree-inline.h"
+#include "version.h"
+#include "rtl.h"
+#include "tm_p.h"
+#include "flags.h"
+#include "hard-reg-set.h"
+#include "output.h"
+#include "except.h"
+#include "function.h"
+#include "toplev.h"
+#include "basic-block.h"
+#include "intl.h"
+#include "ggc.h"
+#include "timevar.h"
+
+#include "params.h"
+
+#if BUILDING_GCC_VERSION <= 4009
+#include "pointer-set.h"
+#else
+#include "hash-map.h"
+#endif
+
+#include "emit-rtl.h"
+#include "debug.h"
+#include "target.h"
+#include "langhooks.h"
+#include "cfgloop.h"
+#include "cgraph.h"
+#include "opts.h"
+
+#if BUILDING_GCC_VERSION == 4005
+#include <sys/mman.h>
+#endif
+
+#if BUILDING_GCC_VERSION >= 4007
+#include "tree-pretty-print.h"
+#include "gimple-pretty-print.h"
+#endif
+
+#if BUILDING_GCC_VERSION >= 4006
+#include "c-family/c-common.h"
+#else
+#include "c-common.h"
+#endif
+
+#if BUILDING_GCC_VERSION <= 4008
+#include "tree-flow.h"
+#else
+#include "tree-cfgcleanup.h"
+#include "tree-ssa-operands.h"
+#include "tree-into-ssa.h"
+#endif
+
+#if BUILDING_GCC_VERSION >= 4008
+#include "is-a.h"
+#endif
+
+#include "diagnostic.h"
+#include "tree-dump.h"
+#include "tree-pass.h"
+#include "predict.h"
+#include "ipa-utils.h"
+
+#if BUILDING_GCC_VERSION >= 4009
+#include "attribs.h"
+#include "varasm.h"
+#include "stor-layout.h"
+#include "internal-fn.h"
+#include "gimple-expr.h"
+#include "gimple-fold.h"
+#include "context.h"
+#include "tree-ssa-alias.h"
+#include "tree-ssa.h"
+#include "stringpool.h"
+#include "tree-ssanames.h"
+#include "print-tree.h"
+#include "tree-eh.h"
+#include "stmt.h"
+#include "gimplify.h"
+#endif
+
+#include "gimple.h"
+
+#if BUILDING_GCC_VERSION >= 4009
+#include "tree-ssa-operands.h"
+#include "tree-phinodes.h"
+#include "tree-cfg.h"
+#include "gimple-iterator.h"
+#include "gimple-ssa.h"
+#include "ssa-iterators.h"
+#endif
+
+#if BUILDING_GCC_VERSION >= 5000
+#include "builtins.h"
+#endif
+
+/* #include "expr.h" where are you... */
+extern rtx emit_move_insn(rtx x, rtx y);
+
+/* missing from basic_block.h... */
+extern void debug_dominance_info(enum cdi_direction dir);
+extern void debug_dominance_tree(enum cdi_direction dir, basic_block root);
+
+#if BUILDING_GCC_VERSION == 4006
+extern void debug_gimple_stmt(gimple);
+extern void debug_gimple_seq(gimple_seq);
+extern void print_gimple_seq(FILE *, gimple_seq, int, int);
+extern void print_gimple_stmt(FILE *, gimple, int, int);
+extern void print_gimple_expr(FILE *, gimple, int, int);
+extern void dump_gimple_stmt(pretty_printer *, gimple, int, int);
+#endif
+
+#define __unused __attribute__((__unused__))
+
+#define DECL_NAME_POINTER(node) IDENTIFIER_POINTER(DECL_NAME(node))
+#define DECL_NAME_LENGTH(node) IDENTIFIER_LENGTH(DECL_NAME(node))
+#define TYPE_NAME_POINTER(node) IDENTIFIER_POINTER(TYPE_NAME(node))
+#define TYPE_NAME_LENGTH(node) IDENTIFIER_LENGTH(TYPE_NAME(node))
+
+/* should come from c-tree.h if only it were installed for gcc 4.5... */
+#define C_TYPE_FIELDS_READONLY(TYPE) TREE_LANG_FLAG_1(TYPE)
+
+#if BUILDING_GCC_VERSION == 4005
+#define FOR_EACH_LOCAL_DECL(FUN, I, D) \
+ for (tree vars = (FUN)->local_decls, (I) = 0; \
+ vars && ((D) = TREE_VALUE(vars)); \
+ vars = TREE_CHAIN(vars), (I)++)
+#define DECL_CHAIN(NODE) (TREE_CHAIN(DECL_MINIMAL_CHECK(NODE)))
+#define FOR_EACH_VEC_ELT(T, V, I, P) \
+ for (I = 0; VEC_iterate(T, (V), (I), (P)); ++(I))
+#define TODO_rebuild_cgraph_edges 0
+#define SCOPE_FILE_SCOPE_P(EXP) (!(EXP))
+
+#ifndef O_BINARY
+#define O_BINARY 0
+#endif
+
+typedef struct varpool_node *varpool_node_ptr;
+
+static inline bool gimple_call_builtin_p(gimple stmt, enum built_in_function code)
+{
+ tree fndecl;
+
+ if (!is_gimple_call(stmt))
+ return false;
+ fndecl = gimple_call_fndecl(stmt);
+ if (!fndecl || DECL_BUILT_IN_CLASS(fndecl) != BUILT_IN_NORMAL)
+ return false;
+ return DECL_FUNCTION_CODE(fndecl) == code;
+}
+
+static inline bool is_simple_builtin(tree decl)
+{
+ if (decl && DECL_BUILT_IN_CLASS(decl) != BUILT_IN_NORMAL)
+ return false;
+
+ switch (DECL_FUNCTION_CODE(decl)) {
+ /* Builtins that expand to constants. */
+ case BUILT_IN_CONSTANT_P:
+ case BUILT_IN_EXPECT:
+ case BUILT_IN_OBJECT_SIZE:
+ case BUILT_IN_UNREACHABLE:
+ /* Simple register moves or loads from stack. */
+ case BUILT_IN_RETURN_ADDRESS:
+ case BUILT_IN_EXTRACT_RETURN_ADDR:
+ case BUILT_IN_FROB_RETURN_ADDR:
+ case BUILT_IN_RETURN:
+ case BUILT_IN_AGGREGATE_INCOMING_ADDRESS:
+ case BUILT_IN_FRAME_ADDRESS:
+ case BUILT_IN_VA_END:
+ case BUILT_IN_STACK_SAVE:
+ case BUILT_IN_STACK_RESTORE:
+ /* Exception state returns or moves registers around. */
+ case BUILT_IN_EH_FILTER:
+ case BUILT_IN_EH_POINTER:
+ case BUILT_IN_EH_COPY_VALUES:
+ return true;
+
+ default:
+ return false;
+ }
+}
+
+static inline void add_local_decl(struct function *fun, tree d)
+{
+ gcc_assert(TREE_CODE(d) == VAR_DECL);
+ fun->local_decls = tree_cons(NULL_TREE, d, fun->local_decls);
+}
+#endif
+
+#if BUILDING_GCC_VERSION <= 4006
+#define ANY_RETURN_P(rtx) (GET_CODE(rtx) == RETURN)
+#define C_DECL_REGISTER(EXP) DECL_LANG_FLAG_4(EXP)
+#define EDGE_PRESERVE 0ULL
+#define HOST_WIDE_INT_PRINT_HEX_PURE "%" HOST_WIDE_INT_PRINT "x"
+#define flag_fat_lto_objects true
+
+#define get_random_seed(noinit) ({ \
+ unsigned HOST_WIDE_INT seed; \
+ sscanf(get_random_seed(noinit), "%" HOST_WIDE_INT_PRINT "x", &seed); \
+ seed * seed; })
+
+#define int_const_binop(code, arg1, arg2) \
+ int_const_binop((code), (arg1), (arg2), 0)
+
+static inline bool gimple_clobber_p(gimple s __unused)
+{
+ return false;
+}
+
+static inline bool gimple_asm_clobbers_memory_p(const_gimple stmt)
+{
+ unsigned i;
+
+ for (i = 0; i < gimple_asm_nclobbers(stmt); i++) {
+ tree op = gimple_asm_clobber_op(stmt, i);
+
+ if (!strcmp(TREE_STRING_POINTER(TREE_VALUE(op)), "memory"))
+ return true;
+ }
+
+ return false;
+}
+
+static inline tree builtin_decl_implicit(enum built_in_function fncode)
+{
+ return implicit_built_in_decls[fncode];
+}
+
+static inline int ipa_reverse_postorder(struct cgraph_node **order)
+{
+ return cgraph_postorder(order);
+}
+
+static inline struct cgraph_node *cgraph_create_node(tree decl)
+{
+ return cgraph_node(decl);
+}
+
+static inline struct cgraph_node *cgraph_get_create_node(tree decl)
+{
+ struct cgraph_node *node = cgraph_get_node(decl);
+
+ return node ? node : cgraph_node(decl);
+}
+
+static inline bool cgraph_function_with_gimple_body_p(struct cgraph_node *node)
+{
+ return node->analyzed && !node->thunk.thunk_p && !node->alias;
+}
+
+static inline struct cgraph_node *cgraph_first_function_with_gimple_body(void)
+{
+ struct cgraph_node *node;
+
+ for (node = cgraph_nodes; node; node = node->next)
+ if (cgraph_function_with_gimple_body_p(node))
+ return node;
+ return NULL;
+}
+
+static inline struct cgraph_node *cgraph_next_function_with_gimple_body(struct cgraph_node *node)
+{
+ for (node = node->next; node; node = node->next)
+ if (cgraph_function_with_gimple_body_p(node))
+ return node;
+ return NULL;
+}
+
+#define FOR_EACH_FUNCTION_WITH_GIMPLE_BODY(node) \
+ for ((node) = cgraph_first_function_with_gimple_body(); (node); \
+ (node) = cgraph_next_function_with_gimple_body(node))
+
+static inline void varpool_add_new_variable(tree decl)
+{
+ varpool_finalize_decl(decl);
+}
+#endif
+
+#if BUILDING_GCC_VERSION <= 4007
+#define FOR_EACH_FUNCTION(node) \
+ for (node = cgraph_nodes; node; node = node->next)
+#define FOR_EACH_VARIABLE(node) \
+ for (node = varpool_nodes; node; node = node->next)
+#define PROP_loops 0
+#define NODE_SYMBOL(node) (node)
+#define NODE_DECL(node) (node)->decl
+#define INSN_LOCATION(INSN) RTL_LOCATION(INSN)
+#define vNULL NULL
+
+static inline int bb_loop_depth(const_basic_block bb)
+{
+ return bb->loop_father ? loop_depth(bb->loop_father) : 0;
+}
+
+static inline bool gimple_store_p(gimple gs)
+{
+ tree lhs = gimple_get_lhs(gs);
+
+ return lhs && !is_gimple_reg(lhs);
+}
+
+static inline void gimple_init_singleton(gimple g __unused)
+{
+}
+#endif
+
+#if BUILDING_GCC_VERSION == 4007 || BUILDING_GCC_VERSION == 4008
+static inline struct cgraph_node *cgraph_alias_target(struct cgraph_node *n)
+{
+ return cgraph_alias_aliased_node(n);
+}
+#endif
+
+#if BUILDING_GCC_VERSION >= 4007 && BUILDING_GCC_VERSION <= 4009
+#define cgraph_create_edge(caller, callee, call_stmt, count, freq, nest) \
+ cgraph_create_edge((caller), (callee), (call_stmt), (count), (freq))
+#define cgraph_create_edge_including_clones(caller, callee, old_call_stmt, call_stmt, count, freq, nest, reason) \
+ cgraph_create_edge_including_clones((caller), (callee), (old_call_stmt), (call_stmt), (count), (freq), (reason))
+#endif
+
+#if BUILDING_GCC_VERSION <= 4008
+#define ENTRY_BLOCK_PTR_FOR_FN(FN) ENTRY_BLOCK_PTR_FOR_FUNCTION(FN)
+#define EXIT_BLOCK_PTR_FOR_FN(FN) EXIT_BLOCK_PTR_FOR_FUNCTION(FN)
+#define basic_block_info_for_fn(FN) ((FN)->cfg->x_basic_block_info)
+#define n_basic_blocks_for_fn(FN) ((FN)->cfg->x_n_basic_blocks)
+#define n_edges_for_fn(FN) ((FN)->cfg->x_n_edges)
+#define last_basic_block_for_fn(FN) ((FN)->cfg->x_last_basic_block)
+#define label_to_block_map_for_fn(FN) ((FN)->cfg->x_label_to_block_map)
+#define profile_status_for_fn(FN) ((FN)->cfg->x_profile_status)
+#define BASIC_BLOCK_FOR_FN(FN, N) BASIC_BLOCK_FOR_FUNCTION((FN), (N))
+#define NODE_IMPLICIT_ALIAS(node) (node)->same_body_alias
+#define VAR_P(NODE) (TREE_CODE(NODE) == VAR_DECL)
+
+static inline bool tree_fits_shwi_p(const_tree t)
+{
+ if (t == NULL_TREE || TREE_CODE(t) != INTEGER_CST)
+ return false;
+
+ if (TREE_INT_CST_HIGH(t) == 0 && (HOST_WIDE_INT)TREE_INT_CST_LOW(t) >= 0)
+ return true;
+
+ if (TREE_INT_CST_HIGH(t) == -1 && (HOST_WIDE_INT)TREE_INT_CST_LOW(t) < 0 && !TYPE_UNSIGNED(TREE_TYPE(t)))
+ return true;
+
+ return false;
+}
+
+static inline bool tree_fits_uhwi_p(const_tree t)
+{
+ if (t == NULL_TREE || TREE_CODE(t) != INTEGER_CST)
+ return false;
+
+ return TREE_INT_CST_HIGH(t) == 0;
+}
+
+static inline HOST_WIDE_INT tree_to_shwi(const_tree t)
+{
+ gcc_assert(tree_fits_shwi_p(t));
+ return TREE_INT_CST_LOW(t);
+}
+
+static inline unsigned HOST_WIDE_INT tree_to_uhwi(const_tree t)
+{
+ gcc_assert(tree_fits_uhwi_p(t));
+ return TREE_INT_CST_LOW(t);
+}
+
+static inline const char *get_tree_code_name(enum tree_code code)
+{
+ gcc_assert(code < MAX_TREE_CODES);
+ return tree_code_name[code];
+}
+
+#define ipa_remove_stmt_references(cnode, stmt)
+
+typedef union gimple_statement_d gasm;
+typedef union gimple_statement_d gassign;
+typedef union gimple_statement_d gcall;
+typedef union gimple_statement_d gcond;
+typedef union gimple_statement_d gdebug;
+typedef union gimple_statement_d gphi;
+typedef union gimple_statement_d greturn;
+
+static inline gasm *as_a_gasm(gimple stmt)
+{
+ return stmt;
+}
+
+static inline const gasm *as_a_const_gasm(const_gimple stmt)
+{
+ return stmt;
+}
+
+static inline gassign *as_a_gassign(gimple stmt)
+{
+ return stmt;
+}
+
+static inline const gassign *as_a_const_gassign(const_gimple stmt)
+{
+ return stmt;
+}
+
+static inline gcall *as_a_gcall(gimple stmt)
+{
+ return stmt;
+}
+
+static inline const gcall *as_a_const_gcall(const_gimple stmt)
+{
+ return stmt;
+}
+
+static inline gcond *as_a_gcond(gimple stmt)
+{
+ return stmt;
+}
+
+static inline const gcond *as_a_const_gcond(const_gimple stmt)
+{
+ return stmt;
+}
+
+static inline gdebug *as_a_gdebug(gimple stmt)
+{
+ return stmt;
+}
+
+static inline const gdebug *as_a_const_gdebug(const_gimple stmt)
+{
+ return stmt;
+}
+
+static inline gphi *as_a_gphi(gimple stmt)
+{
+ return stmt;
+}
+
+static inline const gphi *as_a_const_gphi(const_gimple stmt)
+{
+ return stmt;
+}
+
+static inline greturn *as_a_greturn(gimple stmt)
+{
+ return stmt;
+}
+
+static inline const greturn *as_a_const_greturn(const_gimple stmt)
+{
+ return stmt;
+}
+#endif
+
+#if BUILDING_GCC_VERSION == 4008
+#define NODE_SYMBOL(node) (&(node)->symbol)
+#define NODE_DECL(node) (node)->symbol.decl
+#endif
+
+#if BUILDING_GCC_VERSION >= 4008
+#define add_referenced_var(var)
+#define mark_sym_for_renaming(var)
+#define varpool_mark_needed_node(node)
+#define create_var_ann(var)
+#define TODO_dump_func 0
+#define TODO_dump_cgraph 0
+#endif
+
+#if BUILDING_GCC_VERSION <= 4009
+#define TODO_verify_il 0
+#define AVAIL_INTERPOSABLE AVAIL_OVERWRITABLE
+
+#define section_name_prefix LTO_SECTION_NAME_PREFIX
+#define fatal_error(loc, gmsgid, ...) fatal_error((gmsgid), __VA_ARGS__)
+
+typedef struct rtx_def rtx_insn;
+
+static inline void set_decl_section_name(tree node, const char *value)
+{
+ if (value)
+ DECL_SECTION_NAME(node) = build_string(strlen(value) + 1, value);
+ else
+ DECL_SECTION_NAME(node) = NULL;
+}
+#endif
+
+#if BUILDING_GCC_VERSION == 4009
+typedef struct gimple_statement_asm gasm;
+typedef struct gimple_statement_base gassign;
+typedef struct gimple_statement_call gcall;
+typedef struct gimple_statement_base gcond;
+typedef struct gimple_statement_base gdebug;
+typedef struct gimple_statement_phi gphi;
+typedef struct gimple_statement_base greturn;
+
+static inline gasm *as_a_gasm(gimple stmt)
+{
+ return as_a<gasm>(stmt);
+}
+
+static inline const gasm *as_a_const_gasm(const_gimple stmt)
+{
+ return as_a<const gasm>(stmt);
+}
+
+static inline gassign *as_a_gassign(gimple stmt)
+{
+ return stmt;
+}
+
+static inline const gassign *as_a_const_gassign(const_gimple stmt)
+{
+ return stmt;
+}
+
+static inline gcall *as_a_gcall(gimple stmt)
+{
+ return as_a<gcall>(stmt);
+}
+
+static inline const gcall *as_a_const_gcall(const_gimple stmt)
+{
+ return as_a<const gcall>(stmt);
+}
+
+static inline gcond *as_a_gcond(gimple stmt)
+{
+ return stmt;
+}
+
+static inline const gcond *as_a_const_gcond(const_gimple stmt)
+{
+ return stmt;
+}
+
+static inline gdebug *as_a_gdebug(gimple stmt)
+{
+ return stmt;
+}
+
+static inline const gdebug *as_a_const_gdebug(const_gimple stmt)
+{
+ return stmt;
+}
+
+static inline gphi *as_a_gphi(gimple stmt)
+{
+ return as_a<gphi>(stmt);
+}
+
+static inline const gphi *as_a_const_gphi(const_gimple stmt)
+{
+ return as_a<const gphi>(stmt);
+}
+
+static inline greturn *as_a_greturn(gimple stmt)
+{
+ return stmt;
+}
+
+static inline const greturn *as_a_const_greturn(const_gimple stmt)
+{
+ return stmt;
+}
+#endif
+
+#if BUILDING_GCC_VERSION >= 4009
+#define TODO_ggc_collect 0
+#define NODE_SYMBOL(node) (node)
+#define NODE_DECL(node) (node)->decl
+#define cgraph_node_name(node) (node)->name()
+#define NODE_IMPLICIT_ALIAS(node) (node)->cpp_implicit_alias
+#endif
+
+#if BUILDING_GCC_VERSION >= 5000 && BUILDING_GCC_VERSION < 6000
+/* gimple related */
+template <>
+template <>
+inline bool is_a_helper<const gassign *>::test(const_gimple gs)
+{
+ return gs->code == GIMPLE_ASSIGN;
+}
+#endif
+
+#if BUILDING_GCC_VERSION >= 5000
+#define TODO_verify_ssa TODO_verify_il
+#define TODO_verify_flow TODO_verify_il
+#define TODO_verify_stmts TODO_verify_il
+#define TODO_verify_rtl_sharing TODO_verify_il
+
+#define INSN_DELETED_P(insn) (insn)->deleted()
+
+/* symtab/cgraph related */
+#define debug_cgraph_node(node) (node)->debug()
+#define cgraph_get_node(decl) cgraph_node::get(decl)
+#define cgraph_get_create_node(decl) cgraph_node::get_create(decl)
+#define cgraph_create_node(decl) cgraph_node::create(decl)
+#define cgraph_n_nodes symtab->cgraph_count
+#define cgraph_max_uid symtab->cgraph_max_uid
+#define varpool_get_node(decl) varpool_node::get(decl)
+
+#define cgraph_create_edge(caller, callee, call_stmt, count, freq, nest) \
+ (caller)->create_edge((callee), (call_stmt), (count), (freq))
+#define cgraph_create_edge_including_clones(caller, callee, old_call_stmt, call_stmt, count, freq, nest, reason) \
+ (caller)->create_edge_including_clones((callee), (old_call_stmt), (call_stmt), (count), (freq), (reason))
+
+typedef struct cgraph_node *cgraph_node_ptr;
+typedef struct cgraph_edge *cgraph_edge_p;
+typedef struct varpool_node *varpool_node_ptr;
+
+static inline void change_decl_assembler_name(tree decl, tree name)
+{
+ symtab->change_decl_assembler_name(decl, name);
+}
+
+static inline void varpool_finalize_decl(tree decl)
+{
+ varpool_node::finalize_decl(decl);
+}
+
+static inline void varpool_add_new_variable(tree decl)
+{
+ varpool_node::add(decl);
+}
+
+static inline unsigned int rebuild_cgraph_edges(void)
+{
+ return cgraph_edge::rebuild_edges();
+}
+
+static inline cgraph_node_ptr cgraph_function_node(cgraph_node_ptr node, enum availability *availability)
+{
+ return node->function_symbol(availability);
+}
+
+static inline cgraph_node_ptr cgraph_function_or_thunk_node(cgraph_node_ptr node, enum availability *availability = NULL)
+{
+ return node->ultimate_alias_target(availability);
+}
+
+static inline bool cgraph_only_called_directly_p(cgraph_node_ptr node)
+{
+ return node->only_called_directly_p();
+}
+
+static inline enum availability cgraph_function_body_availability(cgraph_node_ptr node)
+{
+ return node->get_availability();
+}
+
+static inline cgraph_node_ptr cgraph_alias_target(cgraph_node_ptr node)
+{
+ return node->get_alias_target();
+}
+
+static inline struct cgraph_node_hook_list *cgraph_add_function_insertion_hook(cgraph_node_hook hook, void *data)
+{
+ return symtab->add_cgraph_insertion_hook(hook, data);
+}
+
+static inline void cgraph_remove_function_insertion_hook(struct cgraph_node_hook_list *entry)
+{
+ symtab->remove_cgraph_insertion_hook(entry);
+}
+
+static inline struct cgraph_node_hook_list *cgraph_add_node_removal_hook(cgraph_node_hook hook, void *data)
+{
+ return symtab->add_cgraph_removal_hook(hook, data);
+}
+
+static inline void cgraph_remove_node_removal_hook(struct cgraph_node_hook_list *entry)
+{
+ symtab->remove_cgraph_removal_hook(entry);
+}
+
+static inline struct cgraph_2node_hook_list *cgraph_add_node_duplication_hook(cgraph_2node_hook hook, void *data)
+{
+ return symtab->add_cgraph_duplication_hook(hook, data);
+}
+
+static inline void cgraph_remove_node_duplication_hook(struct cgraph_2node_hook_list *entry)
+{
+ symtab->remove_cgraph_duplication_hook(entry);
+}
+
+static inline void cgraph_call_node_duplication_hooks(cgraph_node_ptr node, cgraph_node_ptr node2)
+{
+ symtab->call_cgraph_duplication_hooks(node, node2);
+}
+
+static inline void cgraph_call_edge_duplication_hooks(cgraph_edge *cs1, cgraph_edge *cs2)
+{
+ symtab->call_edge_duplication_hooks(cs1, cs2);
+}
+
+#if BUILDING_GCC_VERSION >= 6000
+typedef gimple *gimple_ptr;
+typedef const gimple *const_gimple_ptr;
+#define gimple gimple_ptr
+#define const_gimple const_gimple_ptr
+#undef CONST_CAST_GIMPLE
+#define CONST_CAST_GIMPLE(X) CONST_CAST(gimple, (X))
+#endif
+
+/* gimple related */
+static inline gimple gimple_build_assign_with_ops(enum tree_code subcode, tree lhs, tree op1, tree op2 MEM_STAT_DECL)
+{
+ return gimple_build_assign(lhs, subcode, op1, op2 PASS_MEM_STAT);
+}
+
+template <>
+template <>
+inline bool is_a_helper<const greturn *>::test(const_gimple gs)
+{
+ return gs->code == GIMPLE_RETURN;
+}
+
+static inline gasm *as_a_gasm(gimple stmt)
+{
+ return as_a<gasm *>(stmt);
+}
+
+static inline const gasm *as_a_const_gasm(const_gimple stmt)
+{
+ return as_a<const gasm *>(stmt);
+}
+
+static inline gassign *as_a_gassign(gimple stmt)
+{
+ return as_a<gassign *>(stmt);
+}
+
+static inline const gassign *as_a_const_gassign(const_gimple stmt)
+{
+ return as_a<const gassign *>(stmt);
+}
+
+static inline gcall *as_a_gcall(gimple stmt)
+{
+ return as_a<gcall *>(stmt);
+}
+
+static inline const gcall *as_a_const_gcall(const_gimple stmt)
+{
+ return as_a<const gcall *>(stmt);
+}
+
+static inline gphi *as_a_gphi(gimple stmt)
+{
+ return as_a<gphi *>(stmt);
+}
+
+static inline const gphi *as_a_const_gphi(const_gimple stmt)
+{
+ return as_a<const gphi *>(stmt);
+}
+
+static inline greturn *as_a_greturn(gimple stmt)
+{
+ return as_a<greturn *>(stmt);
+}
+
+static inline const greturn *as_a_const_greturn(const_gimple stmt)
+{
+ return as_a<const greturn *>(stmt);
+}
+
+/* IPA/LTO related */
+#define ipa_ref_list_referring_iterate(L, I, P) \
+ (L)->referring.iterate((I), &(P))
+#define ipa_ref_list_reference_iterate(L, I, P) \
+ (L)->reference.iterate((I), &(P))
+
+static inline cgraph_node_ptr ipa_ref_referring_node(struct ipa_ref *ref)
+{
+ return dyn_cast<cgraph_node_ptr>(ref->referring);
+}
+
+static inline void ipa_remove_stmt_references(symtab_node *referring_node, gimple stmt)
+{
+ referring_node->remove_stmt_references(stmt);
+}
+#endif
+
+#if BUILDING_GCC_VERSION < 6000
+#define get_inner_reference(exp, pbitsize, pbitpos, poffset, pmode, punsignedp, preversep, pvolatilep, keep_aligning) \
+ get_inner_reference(exp, pbitsize, pbitpos, poffset, pmode, punsignedp, pvolatilep, keep_aligning)
+#define gen_rtx_set(ARG0, ARG1) gen_rtx_SET(VOIDmode, (ARG0), (ARG1))
+#endif
+
+#if BUILDING_GCC_VERSION >= 6000
+#define gen_rtx_set(ARG0, ARG1) gen_rtx_SET((ARG0), (ARG1))
+#endif
+
+#ifdef __cplusplus
+static inline void debug_tree(const_tree t)
+{
+ debug_tree(CONST_CAST_TREE(t));
+}
+
+static inline void debug_gimple_stmt(const_gimple s)
+{
+ debug_gimple_stmt(CONST_CAST_GIMPLE(s));
+}
+#else
+#define debug_tree(t) debug_tree(CONST_CAST_TREE(t))
+#define debug_gimple_stmt(s) debug_gimple_stmt(CONST_CAST_GIMPLE(s))
+#endif
+
+#endif
diff --git a/scripts/gcc-plugins/gcc-generate-gimple-pass.h b/scripts/gcc-plugins/gcc-generate-gimple-pass.h
new file mode 100644
index 0000000..526c3c7
--- /dev/null
+++ b/scripts/gcc-plugins/gcc-generate-gimple-pass.h
@@ -0,0 +1,175 @@
+/*
+ * Generator for GIMPLE pass related boilerplate code/data
+ *
+ * Supports gcc 4.5-6
+ *
+ * Usage:
+ *
+ * 1. before inclusion define PASS_NAME
+ * 2. before inclusion define NO_* for unimplemented callbacks
+ * NO_GATE
+ * NO_EXECUTE
+ * 3. before inclusion define PROPERTIES_* and TODO_FLAGS_* to override
+ * the default 0 values
+ * 4. for convenience, all the above will be undefined after inclusion!
+ * 5. the only exported name is make_PASS_NAME_pass() to register with gcc
+ */
+
+#ifndef PASS_NAME
+#error at least PASS_NAME must be defined
+#else
+#define __GCC_PLUGIN_STRINGIFY(n) #n
+#define _GCC_PLUGIN_STRINGIFY(n) __GCC_PLUGIN_STRINGIFY(n)
+#define _GCC_PLUGIN_CONCAT2(x, y) x ## y
+#define _GCC_PLUGIN_CONCAT3(x, y, z) x ## y ## z
+
+#define __PASS_NAME_PASS_DATA(n) _GCC_PLUGIN_CONCAT2(n, _pass_data)
+#define _PASS_NAME_PASS_DATA __PASS_NAME_PASS_DATA(PASS_NAME)
+
+#define __PASS_NAME_PASS(n) _GCC_PLUGIN_CONCAT2(n, _pass)
+#define _PASS_NAME_PASS __PASS_NAME_PASS(PASS_NAME)
+
+#define _PASS_NAME_NAME _GCC_PLUGIN_STRINGIFY(PASS_NAME)
+
+#define __MAKE_PASS_NAME_PASS(n) _GCC_PLUGIN_CONCAT3(make_, n, _pass)
+#define _MAKE_PASS_NAME_PASS __MAKE_PASS_NAME_PASS(PASS_NAME)
+
+#ifdef NO_GATE
+#define _GATE NULL
+#define _HAS_GATE false
+#else
+#define __GATE(n) _GCC_PLUGIN_CONCAT2(n, _gate)
+#define _GATE __GATE(PASS_NAME)
+#define _HAS_GATE true
+#endif
+
+#ifdef NO_EXECUTE
+#define _EXECUTE NULL
+#define _HAS_EXECUTE false
+#else
+#define __EXECUTE(n) _GCC_PLUGIN_CONCAT2(n, _execute)
+#define _EXECUTE __EXECUTE(PASS_NAME)
+#define _HAS_EXECUTE true
+#endif
+
+#ifndef PROPERTIES_REQUIRED
+#define PROPERTIES_REQUIRED 0
+#endif
+
+#ifndef PROPERTIES_PROVIDED
+#define PROPERTIES_PROVIDED 0
+#endif
+
+#ifndef PROPERTIES_DESTROYED
+#define PROPERTIES_DESTROYED 0
+#endif
+
+#ifndef TODO_FLAGS_START
+#define TODO_FLAGS_START 0
+#endif
+
+#ifndef TODO_FLAGS_FINISH
+#define TODO_FLAGS_FINISH 0
+#endif
+
+#if BUILDING_GCC_VERSION >= 4009
+namespace {
+static const pass_data _PASS_NAME_PASS_DATA = {
+#else
+static struct gimple_opt_pass _PASS_NAME_PASS = {
+ .pass = {
+#endif
+ .type = GIMPLE_PASS,
+ .name = _PASS_NAME_NAME,
+#if BUILDING_GCC_VERSION >= 4008
+ .optinfo_flags = OPTGROUP_NONE,
+#endif
+#if BUILDING_GCC_VERSION >= 5000
+#elif BUILDING_GCC_VERSION == 4009
+ .has_gate = _HAS_GATE,
+ .has_execute = _HAS_EXECUTE,
+#else
+ .gate = _GATE,
+ .execute = _EXECUTE,
+ .sub = NULL,
+ .next = NULL,
+ .static_pass_number = 0,
+#endif
+ .tv_id = TV_NONE,
+ .properties_required = PROPERTIES_REQUIRED,
+ .properties_provided = PROPERTIES_PROVIDED,
+ .properties_destroyed = PROPERTIES_DESTROYED,
+ .todo_flags_start = TODO_FLAGS_START,
+ .todo_flags_finish = TODO_FLAGS_FINISH,
+#if BUILDING_GCC_VERSION < 4009
+ }
+#endif
+};
+
+#if BUILDING_GCC_VERSION >= 4009
+class _PASS_NAME_PASS : public gimple_opt_pass {
+public:
+ _PASS_NAME_PASS() : gimple_opt_pass(_PASS_NAME_PASS_DATA, g) {}
+
+#ifndef NO_GATE
+#if BUILDING_GCC_VERSION >= 5000
+ virtual bool gate(function *) { return _GATE(); }
+#else
+ virtual bool gate(void) { return _GATE(); }
+#endif
+#endif
+
+ virtual opt_pass * clone () { return new _PASS_NAME_PASS(); }
+
+#ifndef NO_EXECUTE
+#if BUILDING_GCC_VERSION >= 5000
+ virtual unsigned int execute(function *) { return _EXECUTE(); }
+#else
+ virtual unsigned int execute(void) { return _EXECUTE(); }
+#endif
+#endif
+};
+}
+
+opt_pass *_MAKE_PASS_NAME_PASS(void)
+{
+ return new _PASS_NAME_PASS();
+}
+#else
+struct opt_pass *_MAKE_PASS_NAME_PASS(void)
+{
+ return &_PASS_NAME_PASS.pass;
+}
+#endif
+
+/* clean up user provided defines */
+#undef PASS_NAME
+#undef NO_GATE
+#undef NO_EXECUTE
+
+#undef PROPERTIES_DESTROYED
+#undef PROPERTIES_PROVIDED
+#undef PROPERTIES_REQUIRED
+#undef TODO_FLAGS_FINISH
+#undef TODO_FLAGS_START
+
+/* clean up generated defines */
+#undef _EXECUTE
+#undef __EXECUTE
+#undef _GATE
+#undef __GATE
+#undef _GCC_PLUGIN_CONCAT2
+#undef _GCC_PLUGIN_CONCAT3
+#undef _GCC_PLUGIN_STRINGIFY
+#undef __GCC_PLUGIN_STRINGIFY
+#undef _HAS_EXECUTE
+#undef _HAS_GATE
+#undef _MAKE_PASS_NAME_PASS
+#undef __MAKE_PASS_NAME_PASS
+#undef _PASS_NAME_NAME
+#undef _PASS_NAME_PASS
+#undef __PASS_NAME_PASS
+#undef _PASS_NAME_PASS_DATA
+#undef __PASS_NAME_PASS_DATA
+
+#endif /* PASS_NAME */
diff --git a/scripts/gcc-plugins/gcc-generate-ipa-pass.h b/scripts/gcc-plugins/gcc-generate-ipa-pass.h
new file mode 100644
index 0000000..9bd926e
--- /dev/null
+++ b/scripts/gcc-plugins/gcc-generate-ipa-pass.h
@@ -0,0 +1,289 @@
+/*
+ * Generator for IPA pass related boilerplate code/data
+ *
+ * Supports gcc 4.5-6
+ *
+ * Usage:
+ *
+ * 1. before inclusion define PASS_NAME
+ * 2. before inclusion define NO_* for unimplemented callbacks
+ * NO_GENERATE_SUMMARY
+ * NO_READ_SUMMARY
+ * NO_WRITE_SUMMARY
+ * NO_READ_OPTIMIZATION_SUMMARY
+ * NO_WRITE_OPTIMIZATION_SUMMARY
+ * NO_STMT_FIXUP
+ * NO_FUNCTION_TRANSFORM
+ * NO_VARIABLE_TRANSFORM
+ * NO_GATE
+ * NO_EXECUTE
+ * 3. before inclusion define PROPERTIES_* and *TODO_FLAGS_* to override
+ * the default 0 values
+ * 4. for convenience, all the above will be undefined after inclusion!
+ * 5. the only exported name is make_PASS_NAME_pass() to register with gcc
+ */
+
+#ifndef PASS_NAME
+#error at least PASS_NAME must be defined
+#else
+#define __GCC_PLUGIN_STRINGIFY(n) #n
+#define _GCC_PLUGIN_STRINGIFY(n) __GCC_PLUGIN_STRINGIFY(n)
+#define _GCC_PLUGIN_CONCAT2(x, y) x ## y
+#define _GCC_PLUGIN_CONCAT3(x, y, z) x ## y ## z
+
+#define __PASS_NAME_PASS_DATA(n) _GCC_PLUGIN_CONCAT2(n, _pass_data)
+#define _PASS_NAME_PASS_DATA __PASS_NAME_PASS_DATA(PASS_NAME)
+
+#define __PASS_NAME_PASS(n) _GCC_PLUGIN_CONCAT2(n, _pass)
+#define _PASS_NAME_PASS __PASS_NAME_PASS(PASS_NAME)
+
+#define _PASS_NAME_NAME _GCC_PLUGIN_STRINGIFY(PASS_NAME)
+
+#define __MAKE_PASS_NAME_PASS(n) _GCC_PLUGIN_CONCAT3(make_, n, _pass)
+#define _MAKE_PASS_NAME_PASS __MAKE_PASS_NAME_PASS(PASS_NAME)
+
+#ifdef NO_GENERATE_SUMMARY
+#define _GENERATE_SUMMARY NULL
+#else
+#define __GENERATE_SUMMARY(n) _GCC_PLUGIN_CONCAT2(n, _generate_summary)
+#define _GENERATE_SUMMARY __GENERATE_SUMMARY(PASS_NAME)
+#endif
+
+#ifdef NO_READ_SUMMARY
+#define _READ_SUMMARY NULL
+#else
+#define __READ_SUMMARY(n) _GCC_PLUGIN_CONCAT2(n, _read_summary)
+#define _READ_SUMMARY __READ_SUMMARY(PASS_NAME)
+#endif
+
+#ifdef NO_WRITE_SUMMARY
+#define _WRITE_SUMMARY NULL
+#else
+#define __WRITE_SUMMARY(n) _GCC_PLUGIN_CONCAT2(n, _write_summary)
+#define _WRITE_SUMMARY __WRITE_SUMMARY(PASS_NAME)
+#endif
+
+#ifdef NO_READ_OPTIMIZATION_SUMMARY
+#define _READ_OPTIMIZATION_SUMMARY NULL
+#else
+#define __READ_OPTIMIZATION_SUMMARY(n) _GCC_PLUGIN_CONCAT2(n, _read_optimization_summary)
+#define _READ_OPTIMIZATION_SUMMARY __READ_OPTIMIZATION_SUMMARY(PASS_NAME)
+#endif
+
+#ifdef NO_WRITE_OPTIMIZATION_SUMMARY
+#define _WRITE_OPTIMIZATION_SUMMARY NULL
+#else
+#define __WRITE_OPTIMIZATION_SUMMARY(n) _GCC_PLUGIN_CONCAT2(n, _write_optimization_summary)
+#define _WRITE_OPTIMIZATION_SUMMARY __WRITE_OPTIMIZATION_SUMMARY(PASS_NAME)
+#endif
+
+#ifdef NO_STMT_FIXUP
+#define _STMT_FIXUP NULL
+#else
+#define __STMT_FIXUP(n) _GCC_PLUGIN_CONCAT2(n, _stmt_fixup)
+#define _STMT_FIXUP __STMT_FIXUP(PASS_NAME)
+#endif
+
+#ifdef NO_FUNCTION_TRANSFORM
+#define _FUNCTION_TRANSFORM NULL
+#else
+#define __FUNCTION_TRANSFORM(n) _GCC_PLUGIN_CONCAT2(n, _function_transform)
+#define _FUNCTION_TRANSFORM __FUNCTION_TRANSFORM(PASS_NAME)
+#endif
+
+#ifdef NO_VARIABLE_TRANSFORM
+#define _VARIABLE_TRANSFORM NULL
+#else
+#define __VARIABLE_TRANSFORM(n) _GCC_PLUGIN_CONCAT2(n, _variable_transform)
+#define _VARIABLE_TRANSFORM __VARIABLE_TRANSFORM(PASS_NAME)
+#endif
+
+#ifdef NO_GATE
+#define _GATE NULL
+#define _HAS_GATE false
+#else
+#define __GATE(n) _GCC_PLUGIN_CONCAT2(n, _gate)
+#define _GATE __GATE(PASS_NAME)
+#define _HAS_GATE true
+#endif
+
+#ifdef NO_EXECUTE
+#define _EXECUTE NULL
+#define _HAS_EXECUTE false
+#else
+#define __EXECUTE(n) _GCC_PLUGIN_CONCAT2(n, _execute)
+#define _EXECUTE __EXECUTE(PASS_NAME)
+#define _HAS_EXECUTE true
+#endif
+
+#ifndef PROPERTIES_REQUIRED
+#define PROPERTIES_REQUIRED 0
+#endif
+
+#ifndef PROPERTIES_PROVIDED
+#define PROPERTIES_PROVIDED 0
+#endif
+
+#ifndef PROPERTIES_DESTROYED
+#define PROPERTIES_DESTROYED 0
+#endif
+
+#ifndef TODO_FLAGS_START
+#define TODO_FLAGS_START 0
+#endif
+
+#ifndef TODO_FLAGS_FINISH
+#define TODO_FLAGS_FINISH 0
+#endif
+
+#ifndef FUNCTION_TRANSFORM_TODO_FLAGS_START
+#define FUNCTION_TRANSFORM_TODO_FLAGS_START 0
+#endif
+
+#if BUILDING_GCC_VERSION >= 4009
+namespace {
+static const pass_data _PASS_NAME_PASS_DATA = {
+#else
+static struct ipa_opt_pass_d _PASS_NAME_PASS = {
+ .pass = {
+#endif
+ .type = IPA_PASS,
+ .name = _PASS_NAME_NAME,
+#if BUILDING_GCC_VERSION >= 4008
+ .optinfo_flags = OPTGROUP_NONE,
+#endif
+#if BUILDING_GCC_VERSION >= 5000
+#elif BUILDING_GCC_VERSION == 4009
+ .has_gate = _HAS_GATE,
+ .has_execute = _HAS_EXECUTE,
+#else
+ .gate = _GATE,
+ .execute = _EXECUTE,
+ .sub = NULL,
+ .next = NULL,
+ .static_pass_number = 0,
+#endif
+ .tv_id = TV_NONE,
+ .properties_required = PROPERTIES_REQUIRED,
+ .properties_provided = PROPERTIES_PROVIDED,
+ .properties_destroyed = PROPERTIES_DESTROYED,
+ .todo_flags_start = TODO_FLAGS_START,
+ .todo_flags_finish = TODO_FLAGS_FINISH,
+#if BUILDING_GCC_VERSION < 4009
+ },
+ .generate_summary = _GENERATE_SUMMARY,
+ .write_summary = _WRITE_SUMMARY,
+ .read_summary = _READ_SUMMARY,
+#if BUILDING_GCC_VERSION >= 4006
+ .write_optimization_summary = _WRITE_OPTIMIZATION_SUMMARY,
+ .read_optimization_summary = _READ_OPTIMIZATION_SUMMARY,
+#endif
+ .stmt_fixup = _STMT_FIXUP,
+ .function_transform_todo_flags_start = FUNCTION_TRANSFORM_TODO_FLAGS_START,
+ .function_transform = _FUNCTION_TRANSFORM,
+ .variable_transform = _VARIABLE_TRANSFORM,
+#endif
+};
+
+#if BUILDING_GCC_VERSION >= 4009
+class _PASS_NAME_PASS : public ipa_opt_pass_d {
+public:
+ _PASS_NAME_PASS() : ipa_opt_pass_d(_PASS_NAME_PASS_DATA,
+ g,
+ _GENERATE_SUMMARY,
+ _WRITE_SUMMARY,
+ _READ_SUMMARY,
+ _WRITE_OPTIMIZATION_SUMMARY,
+ _READ_OPTIMIZATION_SUMMARY,
+ _STMT_FIXUP,
+ FUNCTION_TRANSFORM_TODO_FLAGS_START,
+ _FUNCTION_TRANSFORM,
+ _VARIABLE_TRANSFORM) {}
+
+#ifndef NO_GATE
+#if BUILDING_GCC_VERSION >= 5000
+ virtual bool gate(function *) { return _GATE(); }
+#else
+ virtual bool gate(void) { return _GATE(); }
+#endif
+#endif
+
+ virtual opt_pass *clone() { return new _PASS_NAME_PASS(); }
+
+#ifndef NO_EXECUTE
+#if BUILDING_GCC_VERSION >= 5000
+ virtual unsigned int execute(function *) { return _EXECUTE(); }
+#else
+ virtual unsigned int execute(void) { return _EXECUTE(); }
+#endif
+#endif
+};
+}
+
+opt_pass *_MAKE_PASS_NAME_PASS(void)
+{
+ return new _PASS_NAME_PASS();
+}
+#else
+struct opt_pass *_MAKE_PASS_NAME_PASS(void)
+{
+ return &_PASS_NAME_PASS.pass;
+}
+#endif
+
+/* clean up user provided defines */
+#undef PASS_NAME
+#undef NO_GENERATE_SUMMARY
+#undef NO_WRITE_SUMMARY
+#undef NO_READ_SUMMARY
+#undef NO_WRITE_OPTIMIZATION_SUMMARY
+#undef NO_READ_OPTIMIZATION_SUMMARY
+#undef NO_STMT_FIXUP
+#undef NO_FUNCTION_TRANSFORM
+#undef NO_VARIABLE_TRANSFORM
+#undef NO_GATE
+#undef NO_EXECUTE
+
+#undef FUNCTION_TRANSFORM_TODO_FLAGS_START
+#undef PROPERTIES_DESTROYED
+#undef PROPERTIES_PROVIDED
+#undef PROPERTIES_REQUIRED
+#undef TODO_FLAGS_FINISH
+#undef TODO_FLAGS_START
+
+/* clean up generated defines */
+#undef _EXECUTE
+#undef __EXECUTE
+#undef _FUNCTION_TRANSFORM
+#undef __FUNCTION_TRANSFORM
+#undef _GATE
+#undef __GATE
+#undef _GCC_PLUGIN_CONCAT2
+#undef _GCC_PLUGIN_CONCAT3
+#undef _GCC_PLUGIN_STRINGIFY
+#undef __GCC_PLUGIN_STRINGIFY
+#undef _GENERATE_SUMMARY
+#undef __GENERATE_SUMMARY
+#undef _HAS_EXECUTE
+#undef _HAS_GATE
+#undef _MAKE_PASS_NAME_PASS
+#undef __MAKE_PASS_NAME_PASS
+#undef _PASS_NAME_NAME
+#undef _PASS_NAME_PASS
+#undef __PASS_NAME_PASS
+#undef _PASS_NAME_PASS_DATA
+#undef __PASS_NAME_PASS_DATA
+#undef _READ_OPTIMIZATION_SUMMARY
+#undef __READ_OPTIMIZATION_SUMMARY
+#undef _READ_SUMMARY
+#undef __READ_SUMMARY
+#undef _STMT_FIXUP
+#undef __STMT_FIXUP
+#undef _VARIABLE_TRANSFORM
+#undef __VARIABLE_TRANSFORM
+#undef _WRITE_OPTIMIZATION_SUMMARY
+#undef __WRITE_OPTIMIZATION_SUMMARY
+#undef _WRITE_SUMMARY
+#undef __WRITE_SUMMARY
+
+#endif /* PASS_NAME */
diff --git a/scripts/gcc-plugins/gcc-generate-rtl-pass.h b/scripts/gcc-plugins/gcc-generate-rtl-pass.h
new file mode 100644
index 0000000..1dc67a5
--- /dev/null
+++ b/scripts/gcc-plugins/gcc-generate-rtl-pass.h
@@ -0,0 +1,175 @@
+/*
+ * Generator for RTL pass related boilerplate code/data
+ *
+ * Supports gcc 4.5-6
+ *
+ * Usage:
+ *
+ * 1. before inclusion define PASS_NAME
+ * 2. before inclusion define NO_* for unimplemented callbacks
+ * NO_GATE
+ * NO_EXECUTE
+ * 3. before inclusion define PROPERTIES_* and TODO_FLAGS_* to override
+ * the default 0 values
+ * 4. for convenience, all the above will be undefined after inclusion!
+ * 5. the only exported name is make_PASS_NAME_pass() to register with gcc
+ */
+
+#ifndef PASS_NAME
+#error at least PASS_NAME must be defined
+#else
+#define __GCC_PLUGIN_STRINGIFY(n) #n
+#define _GCC_PLUGIN_STRINGIFY(n) __GCC_PLUGIN_STRINGIFY(n)
+#define _GCC_PLUGIN_CONCAT2(x, y) x ## y
+#define _GCC_PLUGIN_CONCAT3(x, y, z) x ## y ## z
+
+#define __PASS_NAME_PASS_DATA(n) _GCC_PLUGIN_CONCAT2(n, _pass_data)
+#define _PASS_NAME_PASS_DATA __PASS_NAME_PASS_DATA(PASS_NAME)
+
+#define __PASS_NAME_PASS(n) _GCC_PLUGIN_CONCAT2(n, _pass)
+#define _PASS_NAME_PASS __PASS_NAME_PASS(PASS_NAME)
+
+#define _PASS_NAME_NAME _GCC_PLUGIN_STRINGIFY(PASS_NAME)
+
+#define __MAKE_PASS_NAME_PASS(n) _GCC_PLUGIN_CONCAT3(make_, n, _pass)
+#define _MAKE_PASS_NAME_PASS __MAKE_PASS_NAME_PASS(PASS_NAME)
+
+#ifdef NO_GATE
+#define _GATE NULL
+#define _HAS_GATE false
+#else
+#define __GATE(n) _GCC_PLUGIN_CONCAT2(n, _gate)
+#define _GATE __GATE(PASS_NAME)
+#define _HAS_GATE true
+#endif
+
+#ifdef NO_EXECUTE
+#define _EXECUTE NULL
+#define _HAS_EXECUTE false
+#else
+#define __EXECUTE(n) _GCC_PLUGIN_CONCAT2(n, _execute)
+#define _EXECUTE __EXECUTE(PASS_NAME)
+#define _HAS_EXECUTE true
+#endif
+
+#ifndef PROPERTIES_REQUIRED
+#define PROPERTIES_REQUIRED 0
+#endif
+
+#ifndef PROPERTIES_PROVIDED
+#define PROPERTIES_PROVIDED 0
+#endif
+
+#ifndef PROPERTIES_DESTROYED
+#define PROPERTIES_DESTROYED 0
+#endif
+
+#ifndef TODO_FLAGS_START
+#define TODO_FLAGS_START 0
+#endif
+
+#ifndef TODO_FLAGS_FINISH
+#define TODO_FLAGS_FINISH 0
+#endif
+
+#if BUILDING_GCC_VERSION >= 4009
+namespace {
+static const pass_data _PASS_NAME_PASS_DATA = {
+#else
+static struct rtl_opt_pass _PASS_NAME_PASS = {
+ .pass = {
+#endif
+ .type = RTL_PASS,
+ .name = _PASS_NAME_NAME,
+#if BUILDING_GCC_VERSION >= 4008
+ .optinfo_flags = OPTGROUP_NONE,
+#endif
+#if BUILDING_GCC_VERSION >= 5000
+#elif BUILDING_GCC_VERSION == 4009
+ .has_gate = _HAS_GATE,
+ .has_execute = _HAS_EXECUTE,
+#else
+ .gate = _GATE,
+ .execute = _EXECUTE,
+ .sub = NULL,
+ .next = NULL,
+ .static_pass_number = 0,
+#endif
+ .tv_id = TV_NONE,
+ .properties_required = PROPERTIES_REQUIRED,
+ .properties_provided = PROPERTIES_PROVIDED,
+ .properties_destroyed = PROPERTIES_DESTROYED,
+ .todo_flags_start = TODO_FLAGS_START,
+ .todo_flags_finish = TODO_FLAGS_FINISH,
+#if BUILDING_GCC_VERSION < 4009
+ }
+#endif
+};
+
+#if BUILDING_GCC_VERSION >= 4009
+class _PASS_NAME_PASS : public rtl_opt_pass {
+public:
+ _PASS_NAME_PASS() : rtl_opt_pass(_PASS_NAME_PASS_DATA, g) {}
+
+#ifndef NO_GATE
+#if BUILDING_GCC_VERSION >= 5000
+ virtual bool gate(function *) { return _GATE(); }
+#else
+ virtual bool gate(void) { return _GATE(); }
+#endif
+#endif
+
+ virtual opt_pass *clone() { return new _PASS_NAME_PASS(); }
+
+#ifndef NO_EXECUTE
+#if BUILDING_GCC_VERSION >= 5000
+ virtual unsigned int execute(function *) { return _EXECUTE(); }
+#else
+ virtual unsigned int execute(void) { return _EXECUTE(); }
+#endif
+#endif
+};
+}
+
+opt_pass *_MAKE_PASS_NAME_PASS(void)
+{
+ return new _PASS_NAME_PASS();
+}
+#else
+struct opt_pass *_MAKE_PASS_NAME_PASS(void)
+{
+ return &_PASS_NAME_PASS.pass;
+}
+#endif
+
+/* clean up user provided defines */
+#undef PASS_NAME
+#undef NO_GATE
+#undef NO_EXECUTE
+
+#undef PROPERTIES_DESTROYED
+#undef PROPERTIES_PROVIDED
+#undef PROPERTIES_REQUIRED
+#undef TODO_FLAGS_FINISH
+#undef TODO_FLAGS_START
+
+/* clean up generated defines */
+#undef _EXECUTE
+#undef __EXECUTE
+#undef _GATE
+#undef __GATE
+#undef _GCC_PLUGIN_CONCAT2
+#undef _GCC_PLUGIN_CONCAT3
+#undef _GCC_PLUGIN_STRINGIFY
+#undef __GCC_PLUGIN_STRINGIFY
+#undef _HAS_EXECUTE
+#undef _HAS_GATE
+#undef _MAKE_PASS_NAME_PASS
+#undef __MAKE_PASS_NAME_PASS
+#undef _PASS_NAME_NAME
+#undef _PASS_NAME_PASS
+#undef __PASS_NAME_PASS
+#undef _PASS_NAME_PASS_DATA
+#undef __PASS_NAME_PASS_DATA
+
+#endif /* PASS_NAME */
diff --git a/scripts/gcc-plugins/gcc-generate-simple_ipa-pass.h b/scripts/gcc-plugins/gcc-generate-simple_ipa-pass.h
new file mode 100644
index 0000000..a27e2b3
--- /dev/null
+++ b/scripts/gcc-plugins/gcc-generate-simple_ipa-pass.h
@@ -0,0 +1,175 @@
+/*
+ * Generator for SIMPLE_IPA pass related boilerplate code/data
+ *
+ * Supports gcc 4.5-6
+ *
+ * Usage:
+ *
+ * 1. before inclusion define PASS_NAME
+ * 2. before inclusion define NO_* for unimplemented callbacks
+ * NO_GATE
+ * NO_EXECUTE
+ * 3. before inclusion define PROPERTIES_* and TODO_FLAGS_* to override
+ * the default 0 values
+ * 4. for convenience, all the above will be undefined after inclusion!
+ * 5. the only exported name is make_PASS_NAME_pass() to register with gcc
+ */
+
+#ifndef PASS_NAME
+#error at least PASS_NAME must be defined
+#else
+#define __GCC_PLUGIN_STRINGIFY(n) #n
+#define _GCC_PLUGIN_STRINGIFY(n) __GCC_PLUGIN_STRINGIFY(n)
+#define _GCC_PLUGIN_CONCAT2(x, y) x ## y
+#define _GCC_PLUGIN_CONCAT3(x, y, z) x ## y ## z
+
+#define __PASS_NAME_PASS_DATA(n) _GCC_PLUGIN_CONCAT2(n, _pass_data)
+#define _PASS_NAME_PASS_DATA __PASS_NAME_PASS_DATA(PASS_NAME)
+
+#define __PASS_NAME_PASS(n) _GCC_PLUGIN_CONCAT2(n, _pass)
+#define _PASS_NAME_PASS __PASS_NAME_PASS(PASS_NAME)
+
+#define _PASS_NAME_NAME _GCC_PLUGIN_STRINGIFY(PASS_NAME)
+
+#define __MAKE_PASS_NAME_PASS(n) _GCC_PLUGIN_CONCAT3(make_, n, _pass)
+#define _MAKE_PASS_NAME_PASS __MAKE_PASS_NAME_PASS(PASS_NAME)
+
+#ifdef NO_GATE
+#define _GATE NULL
+#define _HAS_GATE false
+#else
+#define __GATE(n) _GCC_PLUGIN_CONCAT2(n, _gate)
+#define _GATE __GATE(PASS_NAME)
+#define _HAS_GATE true
+#endif
+
+#ifdef NO_EXECUTE
+#define _EXECUTE NULL
+#define _HAS_EXECUTE false
+#else
+#define __EXECUTE(n) _GCC_PLUGIN_CONCAT2(n, _execute)
+#define _EXECUTE __EXECUTE(PASS_NAME)
+#define _HAS_EXECUTE true
+#endif
+
+#ifndef PROPERTIES_REQUIRED
+#define PROPERTIES_REQUIRED 0
+#endif
+
+#ifndef PROPERTIES_PROVIDED
+#define PROPERTIES_PROVIDED 0
+#endif
+
+#ifndef PROPERTIES_DESTROYED
+#define PROPERTIES_DESTROYED 0
+#endif
+
+#ifndef TODO_FLAGS_START
+#define TODO_FLAGS_START 0
+#endif
+
+#ifndef TODO_FLAGS_FINISH
+#define TODO_FLAGS_FINISH 0
+#endif
+
+#if BUILDING_GCC_VERSION >= 4009
+namespace {
+static const pass_data _PASS_NAME_PASS_DATA = {
+#else
+static struct simple_ipa_opt_pass _PASS_NAME_PASS = {
+ .pass = {
+#endif
+ .type = SIMPLE_IPA_PASS,
+ .name = _PASS_NAME_NAME,
+#if BUILDING_GCC_VERSION >= 4008
+ .optinfo_flags = OPTGROUP_NONE,
+#endif
+#if BUILDING_GCC_VERSION >= 5000
+#elif BUILDING_GCC_VERSION == 4009
+ .has_gate = _HAS_GATE,
+ .has_execute = _HAS_EXECUTE,
+#else
+ .gate = _GATE,
+ .execute = _EXECUTE,
+ .sub = NULL,
+ .next = NULL,
+ .static_pass_number = 0,
+#endif
+ .tv_id = TV_NONE,
+ .properties_required = PROPERTIES_REQUIRED,
+ .properties_provided = PROPERTIES_PROVIDED,
+ .properties_destroyed = PROPERTIES_DESTROYED,
+ .todo_flags_start = TODO_FLAGS_START,
+ .todo_flags_finish = TODO_FLAGS_FINISH,
+#if BUILDING_GCC_VERSION < 4009
+ }
+#endif
+};
+
+#if BUILDING_GCC_VERSION >= 4009
+class _PASS_NAME_PASS : public simple_ipa_opt_pass {
+public:
+ _PASS_NAME_PASS() : simple_ipa_opt_pass(_PASS_NAME_PASS_DATA, g) {}
+
+#ifndef NO_GATE
+#if BUILDING_GCC_VERSION >= 5000
+ virtual bool gate(function *) { return _GATE(); }
+#else
+ virtual bool gate(void) { return _GATE(); }
+#endif
+#endif
+
+ virtual opt_pass *clone() { return new _PASS_NAME_PASS(); }
+
+#ifndef NO_EXECUTE
+#if BUILDING_GCC_VERSION >= 5000
+ virtual unsigned int execute(function *) { return _EXECUTE(); }
+#else
+ virtual unsigned int execute(void) { return _EXECUTE(); }
+#endif
+#endif
+};
+}
+
+opt_pass *_MAKE_PASS_NAME_PASS(void)
+{
+ return new _PASS_NAME_PASS();
+}
+#else
+struct opt_pass *_MAKE_PASS_NAME_PASS(void)
+{
+ return &_PASS_NAME_PASS.pass;
+}
+#endif
+
+/* clean up user provided defines */
+#undef PASS_NAME
+#undef NO_GATE
+#undef NO_EXECUTE
+
+#undef PROPERTIES_DESTROYED
+#undef PROPERTIES_PROVIDED
+#undef PROPERTIES_REQUIRED
+#undef TODO_FLAGS_FINISH
+#undef TODO_FLAGS_START
+
+/* clean up generated defines */
+#undef _EXECUTE
+#undef __EXECUTE
+#undef _GATE
+#undef __GATE
+#undef _GCC_PLUGIN_CONCAT2
+#undef _GCC_PLUGIN_CONCAT3
+#undef _GCC_PLUGIN_STRINGIFY
+#undef __GCC_PLUGIN_STRINGIFY
+#undef _HAS_EXECUTE
+#undef _HAS_GATE
+#undef _MAKE_PASS_NAME_PASS
+#undef __MAKE_PASS_NAME_PASS
+#undef _PASS_NAME_NAME
+#undef _PASS_NAME_PASS
+#undef __PASS_NAME_PASS
+#undef _PASS_NAME_PASS_DATA
+#undef __PASS_NAME_PASS_DATA
+
+#endif /* PASS_NAME */
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index f0f6d9d..4f727eb 100755
--- a/scripts/link-vmlinux.sh
+++ b/scripts/link-vmlinux.sh
@@ -180,7 +180,7 @@ else
fi;
# final build of init/
-${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init
+${MAKE} -f "${srctree}/scripts/Makefile.build" obj=init GCC_PLUGINS_CFLAGS="${GCC_PLUGINS_CFLAGS}"
kallsymso=""
kallsyms_vmlinux=""
diff --git a/scripts/package/builddeb b/scripts/package/builddeb
index 6c3b038..4bac93f 100755
--- a/scripts/package/builddeb
+++ b/scripts/package/builddeb
@@ -326,6 +326,7 @@ fi
(cd $srctree; find arch/$SRCARCH -name module.lds -o -name Kbuild.platforms -o -name Platform) >> "$objtree/debian/hdrsrcfiles"
(cd $srctree; find $(find arch/$SRCARCH -name include -o -name scripts -type d) -type f) >> "$objtree/debian/hdrsrcfiles"
(cd $objtree; find arch/$SRCARCH/include Module.symvers include scripts -type f) >> "$objtree/debian/hdrobjfiles"
+(cd $objtree; find scripts/gcc-plugins -name \*.so -o -name gcc-common.h) >> "$objtree/debian/hdrobjfiles"
destdir=$kernel_headers_dir/usr/src/linux-headers-$version
mkdir -p "$destdir"
(cd $srctree; tar -c -f - -T -) < "$objtree/debian/hdrsrcfiles" | (cd $destdir; tar -xf -)
--
2.4.1
The GCC plugin infrastructure supports the arm and arm64 architectures too
Signed-off-by: David Brown <[email protected]>
---
arch/arm/Kconfig | 1 +
arch/arm64/Kconfig | 1 +
2 files changed, 2 insertions(+)
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 0846026..8f57eb6 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -55,6 +55,7 @@ config ARM
select HAVE_FUNCTION_GRAPH_TRACER if (!THUMB2_KERNEL)
select HAVE_FUNCTION_TRACER if (!XIP_KERNEL)
select HAVE_GENERIC_DMA_COHERENT
+ select HAVE_GCC_PLUGINS
select HAVE_HW_BREAKPOINT if (PERF_EVENTS && (CPU_V6 || CPU_V6K || CPU_V7))
select HAVE_IDE if PCI || ISA || PCMCIA
select HAVE_IRQ_TIME_ACCOUNTING
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index c8762f4..33f30f6 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -76,6 +76,7 @@ config ARM64
select HAVE_FTRACE_MCOUNT_RECORD
select HAVE_FUNCTION_TRACER
select HAVE_FUNCTION_GRAPH_TRACER
+ select HAVE_GCC_PLUGINS
select HAVE_GENERIC_DMA_COHERENT
select HAVE_HW_BREAKPOINT if PERF_EVENTS
select HAVE_IRQ_TIME_ACCOUNTING
--
2.4.1
Add a very simple plugin to demonstrate the GCC plugin infrastructure. This GCC
plugin computes the cyclomatic complexity of each function.
The complexity M of a function's control flow graph is defined as:
M = E - N + 2P
where
E = the number of edges
N = the number of nodes
P = the number of connected components (exit nodes).
Signed-off-by: Emese Revfy <[email protected]>
---
arch/Kconfig | 12 +++++
scripts/Makefile.gcc-plugins | 2 +
scripts/gcc-plugins/Makefile | 4 ++
scripts/gcc-plugins/cyc_complexity_plugin.c | 73 +++++++++++++++++++++++++++++
4 files changed, 91 insertions(+)
create mode 100644 scripts/gcc-plugins/cyc_complexity_plugin.c
diff --git a/arch/Kconfig b/arch/Kconfig
index 7c12571..ddf29b4 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -366,6 +366,18 @@ menuconfig GCC_PLUGINS
GCC plugins are loadable modules that provide extra features to the
compiler. They are useful for runtime instrumentation and static analysis.
+config GCC_PLUGIN_CYC_COMPLEXITY
+ bool "Compute the cyclomatic complexity of a function"
+ depends on GCC_PLUGINS
+ help
+ The complexity M of a function's control flow graph is defined as:
+ M = E - N + 2P
+ where
+
+ E = the number of edges
+ N = the number of nodes
+ P = the number of connected components (exit nodes).
+
config HAVE_CC_STACKPROTECTOR
bool
help
diff --git a/scripts/Makefile.gcc-plugins b/scripts/Makefile.gcc-plugins
index e6d66e2..282d63a 100644
--- a/scripts/Makefile.gcc-plugins
+++ b/scripts/Makefile.gcc-plugins
@@ -2,6 +2,8 @@ ifdef CONFIG_GCC_PLUGINS
__PLUGINCC := $(call cc-ifversion, -ge, 0408, $(HOSTCXX), $(HOSTCC))
PLUGINCC := $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-plugin.sh "$(__PLUGINCC)" "$(HOSTCXX)" "$(CC)")
+ gcc-plugin-$(CONFIG_GCC_PLUGIN_CYC_COMPLEXITY) += cyc_complexity_plugin.so
+
GCC_PLUGINS_CFLAGS := $(addprefix -fplugin=$(objtree)/scripts/gcc-plugins/, $(gcc-plugin-y))
ifeq ($(PLUGINCC),)
diff --git a/scripts/gcc-plugins/Makefile b/scripts/gcc-plugins/Makefile
index b2d64af..31c72bf 100644
--- a/scripts/gcc-plugins/Makefile
+++ b/scripts/gcc-plugins/Makefile
@@ -12,4 +12,8 @@ endif
export GCCPLUGINS_DIR HOSTLIBS
+$(HOSTLIBS)-$(CONFIG_GCC_PLUGIN_CYC_COMPLEXITY) := cyc_complexity_plugin.so
+
always := $($(HOSTLIBS)-y)
+
+cyc_complexity_plugin-objs := cyc_complexity_plugin.o
diff --git a/scripts/gcc-plugins/cyc_complexity_plugin.c b/scripts/gcc-plugins/cyc_complexity_plugin.c
new file mode 100644
index 0000000..34df974
--- /dev/null
+++ b/scripts/gcc-plugins/cyc_complexity_plugin.c
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2011-2016 by Emese Revfy <[email protected]>
+ * Licensed under the GPL v2, or (at your option) v3
+ *
+ * Homepage:
+ * https://github.com/ephox-gcc-plugins/cyclomatic_complexity
+ *
+ * http://en.wikipedia.org/wiki/Cyclomatic_complexity
+ * The complexity M is then defined as:
+ * M = E - N + 2P
+ * where
+ *
+ * E = the number of edges of the graph
+ * N = the number of nodes of the graph
+ * P = the number of connected components (exit nodes).
+ *
+ * Usage (4.5 - 5):
+ * $ make clean; make run
+ */
+
+#include "gcc-common.h"
+
+int plugin_is_GPL_compatible;
+
+static struct plugin_info cyc_complexity_plugin_info = {
+ .version = "20160225",
+ .help = "Cyclomatic Complexity\n",
+};
+
+static unsigned int cyc_complexity_execute(void)
+{
+ int complexity;
+ expanded_location xloc;
+
+ /* M = E - N + 2P */
+ complexity = n_edges_for_fn(cfun) - n_basic_blocks_for_fn(cfun) + 2;
+
+ xloc = expand_location(DECL_SOURCE_LOCATION(current_function_decl));
+ fprintf(stderr, "Cyclomatic Complexity %d %s:%s\n", complexity,
+ xloc.file, DECL_NAME_POINTER(current_function_decl));
+
+ return 0;
+}
+
+#define PASS_NAME cyc_complexity
+
+#define NO_GATE
+#define TODO_FLAGS_FINISH TODO_dump_func
+
+#include "gcc-generate-gimple-pass.h"
+
+int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
+{
+ const char * const plugin_name = plugin_info->base_name;
+ struct register_pass_info cyc_complexity_pass_info;
+
+ cyc_complexity_pass_info.pass = make_cyc_complexity_pass();
+ cyc_complexity_pass_info.reference_pass_name = "ssa";
+ cyc_complexity_pass_info.ref_pass_instance_number = 1;
+ cyc_complexity_pass_info.pos_op = PASS_POS_INSERT_AFTER;
+
+ if (!plugin_default_version_check(version, &gcc_version)) {
+ error(G_("incompatible gcc/plugin versions"));
+ return 1;
+ }
+
+ register_callback(plugin_name, PLUGIN_INFO, NULL,
+ &cyc_complexity_plugin_info);
+ register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL,
+ &cyc_complexity_pass_info);
+
+ return 0;
+}
--
2.4.1
This is the GCC infrastructure documentation about its operation, how to add
and use a new plugin with an example.
Signed-off-by: Emese Revfy <[email protected]>
---
Documentation/gcc-plugins.txt | 83 +++++++++++++++++++++++++++++++++++++++++++
arch/Kconfig | 2 ++
2 files changed, 85 insertions(+)
create mode 100644 Documentation/gcc-plugins.txt
diff --git a/Documentation/gcc-plugins.txt b/Documentation/gcc-plugins.txt
new file mode 100644
index 0000000..9fa9bd2
--- /dev/null
+++ b/Documentation/gcc-plugins.txt
@@ -0,0 +1,83 @@
+GCC plugin infrastructure
+=========================
+
+
+1. Introduction
+===============
+
+GCC plugins are loadable modules that provide extra features to the
+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.
+
+Currently the GCC plugin infrastructure supports only the x86, arm and arm64
+architectures.
+
+This infrastructure was ported from grsecurity [6] and PaX [7].
+
+--
+[1] https://gcc.gnu.org/onlinedocs/gccint/Plugins.html
+[2] https://gcc.gnu.org/onlinedocs/gccint/Plugin-API.html#Plugin-API
+[3] https://gcc.gnu.org/onlinedocs/gccint/GIMPLE.html
+[4] https://gcc.gnu.org/onlinedocs/gccint/IPA.html
+[5] https://gcc.gnu.org/onlinedocs/gccint/RTL.html
+[6] https://grsecurity.net/
+[7] https://pax.grsecurity.net/
+
+
+2. Files
+========
+
+$(src)/scripts/gcc-plugins
+ This is the directory of the GCC plugins.
+
+$(src)/scripts/gcc-plugins/gcc-common.h
+ This is a compatibility header for GCC plugins.
+ It should be always included instead of individual gcc headers.
+
+$(src)/scripts/gcc-plugin.sh
+ This script checks the availability of the included headers in
+ gcc-common.h and chooses the proper host compiler to build the plugins
+ (gcc-4.7 can be built by either gcc or g++).
+
+$(src)/scripts/gcc-plugins/gcc-generate-gimple-pass.h
+$(src)/scripts/gcc-plugins/gcc-generate-ipa-pass.h
+$(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.
+ They should be preferred to creating the structures by hand.
+
+
+3. Usage
+========
+
+You must install the gcc plugin headers for your gcc version,
+e.g., on Ubuntu for gcc-4.9:
+
+ apt-get install gcc-4.9-plugin-dev
+
+Enable a GCC plugin based feature in the kernel config:
+
+ CONFIG_GCC_PLUGIN_CYC_COMPLEXITY = y
+
+To compile only the plugin(s):
+
+ make gcc-plugins
+
+or just run the kernel make and compile the whole kernel with
+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.
+See the cyc_complexity_plugin.c (CONFIG_GCC_PLUGIN_CYC_COMPLEXITY) GCC plugin.
diff --git a/arch/Kconfig b/arch/Kconfig
index ddf29b4..e783429 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -366,6 +366,8 @@ menuconfig GCC_PLUGINS
GCC plugins are loadable modules that provide extra features to the
compiler. They are useful for runtime instrumentation and static analysis.
+ See Documentation/gcc-plugins.txt for details.
+
config GCC_PLUGIN_CYC_COMPLEXITY
bool "Compute the cyclomatic complexity of a function"
depends on GCC_PLUGINS
--
2.4.1
The sancov gcc plugin inserts a __sanitizer_cov_trace_pc() call
at the start of basic blocks.
This plugin is a helper plugin for the kcov feature. It supports
all gcc versions with plugin support (from gcc-4.5 on).
It is based on the gcc commit "Add fuzzing coverage support" by Dmitry Vyukov
(https://gcc.gnu.org/viewcvs/gcc?limit_changes=0&view=revision&revision=231296).
Signed-off-by: Emese Revfy <[email protected]>
---
Makefile | 10 +--
arch/Kconfig | 9 +++
arch/x86/purgatory/Makefile | 2 +
lib/Kconfig.debug | 2 +
scripts/Makefile.gcc-plugins | 18 +++++
scripts/gcc-plugins/Makefile | 5 ++
scripts/gcc-plugins/sancov_plugin.c | 144 ++++++++++++++++++++++++++++++++++++
7 files changed, 181 insertions(+), 9 deletions(-)
create mode 100644 scripts/gcc-plugins/sancov_plugin.c
diff --git a/Makefile b/Makefile
index 22f0e1b..f09f2bf 100644
--- a/Makefile
+++ b/Makefile
@@ -365,7 +365,7 @@ LDFLAGS_MODULE =
CFLAGS_KERNEL =
AFLAGS_KERNEL =
CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
-CFLAGS_KCOV = -fsanitize-coverage=trace-pc
+CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)
# Use USERINCLUDE when you must reference the UAPI directories only.
@@ -685,14 +685,6 @@ endif
endif
KBUILD_CFLAGS += $(stackp-flag)
-ifdef CONFIG_KCOV
- ifeq ($(call cc-option, $(CFLAGS_KCOV)),)
- $(warning Cannot use CONFIG_KCOV: \
- -fsanitize-coverage=trace-pc is not supported by compiler)
- CFLAGS_KCOV =
- endif
-endif
-
ifeq ($(cc-name),clang)
KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
diff --git a/arch/Kconfig b/arch/Kconfig
index e783429..5d856c8 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -380,6 +380,15 @@ config GCC_PLUGIN_CYC_COMPLEXITY
N = the number of nodes
P = the number of connected components (exit nodes).
+config GCC_PLUGIN_SANCOV
+ bool
+ depends on GCC_PLUGINS
+ help
+ This plugin inserts a __sanitizer_cov_trace_pc() call at the start of
+ basic blocks. It supports all gcc versions with plugin support (from
+ gcc-4.5 on). It is based on the commit "Add fuzzing coverage support"
+ by Dmitry Vyukov <[email protected]>.
+
config HAVE_CC_STACKPROTECTOR
bool
help
diff --git a/arch/x86/purgatory/Makefile b/arch/x86/purgatory/Makefile
index 12734a9..ac58c16 100644
--- a/arch/x86/purgatory/Makefile
+++ b/arch/x86/purgatory/Makefile
@@ -8,6 +8,8 @@ PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
LDFLAGS_purgatory.ro := -e purgatory_start -r --no-undefined -nostdlib -z nodefaultlib
targets += purgatory.ro
+KCOV_INSTRUMENT := n
+
# Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
# in turn leaves some undefined symbols like __fentry__ in purgatory and not
# sure how to relocate those. Like kexec-tools, use custom flags.
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 4fff4b0..616f7ed 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -708,6 +708,8 @@ config KCOV
bool "Code coverage for fuzzing"
depends on ARCH_HAS_KCOV
select DEBUG_FS
+ select GCC_PLUGINS
+ select GCC_PLUGIN_SANCOV
help
KCOV exposes kernel code coverage information in a form suitable
for coverage-guided fuzzing (randomized testing).
diff --git a/scripts/Makefile.gcc-plugins b/scripts/Makefile.gcc-plugins
index 282d63a..33ab13e 100644
--- a/scripts/Makefile.gcc-plugins
+++ b/scripts/Makefile.gcc-plugins
@@ -2,8 +2,23 @@ ifdef CONFIG_GCC_PLUGINS
__PLUGINCC := $(call cc-ifversion, -ge, 0408, $(HOSTCXX), $(HOSTCC))
PLUGINCC := $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-plugin.sh "$(__PLUGINCC)" "$(HOSTCXX)" "$(CC)")
+ SANCOV_PLUGIN := -fplugin=$(objtree)/scripts/gcc-plugins/sancov_plugin.so
+
gcc-plugin-$(CONFIG_GCC_PLUGIN_CYC_COMPLEXITY) += cyc_complexity_plugin.so
+ ifdef CONFIG_GCC_PLUGIN_SANCOV
+ ifeq ($(CFLAGS_KCOV),)
+ # It is needed because of the gcc-plugin.sh and gcc version checks.
+ gcc-plugin-$(CONFIG_GCC_PLUGIN_SANCOV) += sancov_plugin.so
+
+ ifneq ($(PLUGINCC),)
+ CFLAGS_KCOV := $(SANCOV_PLUGIN)
+ else
+ $(error Cannot use CONFIG_KCOV: -fsanitize-coverage=trace-pc is not supported by compiler)
+ endif
+ endif
+ endif
+
GCC_PLUGINS_CFLAGS := $(addprefix -fplugin=$(objtree)/scripts/gcc-plugins/, $(gcc-plugin-y))
ifeq ($(PLUGINCC),)
@@ -15,6 +30,9 @@ ifdef CONFIG_GCC_PLUGINS
$(error error, your gcc version does not support plugins, you should upgrade it to gcc 4.5 at least)
endif
endif
+ else
+ # SANCOV_PLUGIN can be only in CFLAGS_KCOV because avoid duplication.
+ GCC_PLUGINS_CFLAGS := $(filter-out $(SANCOV_PLUGIN), $(GCC_PLUGINS_CFLAGS))
endif
KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
diff --git a/scripts/gcc-plugins/Makefile b/scripts/gcc-plugins/Makefile
index 31c72bf..79164c1 100644
--- a/scripts/gcc-plugins/Makefile
+++ b/scripts/gcc-plugins/Makefile
@@ -14,6 +14,11 @@ export GCCPLUGINS_DIR HOSTLIBS
$(HOSTLIBS)-$(CONFIG_GCC_PLUGIN_CYC_COMPLEXITY) := cyc_complexity_plugin.so
+ifeq ($(CFLAGS_KCOV), -fplugin=$(objtree)/scripts/gcc-plugins/sancov_plugin.so)
+ $(HOSTLIBS)-$(CONFIG_GCC_PLUGIN_SANCOV) += sancov_plugin.so
+endif
+
always := $($(HOSTLIBS)-y)
cyc_complexity_plugin-objs := cyc_complexity_plugin.o
+sancov_plugin-objs := sancov_plugin.o
diff --git a/scripts/gcc-plugins/sancov_plugin.c b/scripts/gcc-plugins/sancov_plugin.c
new file mode 100644
index 0000000..aedd611
--- /dev/null
+++ b/scripts/gcc-plugins/sancov_plugin.c
@@ -0,0 +1,144 @@
+/*
+ * Copyright 2011-2016 by Emese Revfy <[email protected]>
+ * Licensed under the GPL v2, or (at your option) v3
+ *
+ * Homepage:
+ * https://github.com/ephox-gcc-plugins/sancov
+ *
+ * This plugin inserts a __sanitizer_cov_trace_pc() call at the start of basic blocks.
+ * It supports all gcc versions with plugin support (from gcc-4.5 on).
+ * It is based on the commit "Add fuzzing coverage support" by Dmitry Vyukov <[email protected]>.
+ *
+ * You can read about it more here:
+ * https://gcc.gnu.org/viewcvs/gcc?limit_changes=0&view=revision&revision=231296
+ * http://lwn.net/Articles/674854/
+ * https://github.com/google/syzkaller
+ * https://lwn.net/Articles/677764/
+ *
+ * Usage:
+ * make run
+ */
+
+#include "gcc-common.h"
+
+int plugin_is_GPL_compatible;
+
+tree sancov_fndecl;
+
+static struct plugin_info sancov_plugin_info = {
+ .version = "20160402",
+ .help = "sancov plugin\n",
+};
+
+static unsigned int sancov_execute(void)
+{
+ basic_block bb;
+
+ /* Remove this line when this plugin and kcov will be in the kernel.
+ if (!strcmp(DECL_NAME_POINTER(current_function_decl), DECL_NAME_POINTER(sancov_fndecl)))
+ return 0;
+ */
+
+ FOR_EACH_BB_FN(bb, cfun) {
+ const_gimple stmt;
+ gcall *gcall;
+ gimple_stmt_iterator gsi = gsi_after_labels(bb);
+
+ if (gsi_end_p(gsi))
+ continue;
+
+ stmt = gsi_stmt(gsi);
+ gcall = as_a_gcall(gimple_build_call(sancov_fndecl, 0));
+ gimple_set_location(gcall, gimple_location(stmt));
+ gsi_insert_before(&gsi, gcall, GSI_SAME_STMT);
+ }
+ return 0;
+}
+
+#define PASS_NAME sancov
+
+#define NO_GATE
+#define TODO_FLAGS_FINISH TODO_dump_func | TODO_verify_stmts | TODO_update_ssa_no_phi | TODO_verify_flow
+
+#include "gcc-generate-gimple-pass.h"
+
+static void sancov_start_unit(void __unused *gcc_data, void __unused *user_data)
+{
+ tree leaf_attr, nothrow_attr;
+ tree BT_FN_VOID = build_function_type_list(void_type_node, NULL_TREE);
+
+ sancov_fndecl = build_fn_decl("__sanitizer_cov_trace_pc", BT_FN_VOID);
+
+ DECL_ASSEMBLER_NAME(sancov_fndecl);
+ TREE_PUBLIC(sancov_fndecl) = 1;
+ DECL_EXTERNAL(sancov_fndecl) = 1;
+ DECL_ARTIFICIAL(sancov_fndecl) = 1;
+ DECL_PRESERVE_P(sancov_fndecl) = 1;
+ DECL_UNINLINABLE(sancov_fndecl) = 1;
+ TREE_USED(sancov_fndecl) = 1;
+
+ nothrow_attr = tree_cons(get_identifier("nothrow"), NULL, NULL);
+ decl_attributes(&sancov_fndecl, nothrow_attr, 0);
+ gcc_assert(TREE_NOTHROW(sancov_fndecl));
+#if BUILDING_GCC_VERSION > 4005
+ leaf_attr = tree_cons(get_identifier("leaf"), NULL, NULL);
+ decl_attributes(&sancov_fndecl, leaf_attr, 0);
+#endif
+}
+
+int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
+{
+ int i;
+ struct register_pass_info sancov_plugin_pass_info;
+ const char * const plugin_name = plugin_info->base_name;
+ const int argc = plugin_info->argc;
+ const struct plugin_argument * const argv = plugin_info->argv;
+ bool enable = true;
+
+ static const struct ggc_root_tab gt_ggc_r_gt_sancov[] = {
+ {
+ .base = &sancov_fndecl,
+ .nelt = 1,
+ .stride = sizeof(sancov_fndecl),
+ .cb = >_ggc_mx_tree_node,
+ .pchw = >_pch_nx_tree_node
+ },
+ LAST_GGC_ROOT_TAB
+ };
+
+ /* BBs can be split afterwards?? */
+ sancov_plugin_pass_info.pass = make_sancov_pass();
+#if BUILDING_GCC_VERSION >= 4009
+ sancov_plugin_pass_info.reference_pass_name = "asan";
+#else
+ sancov_plugin_pass_info.reference_pass_name = "nrv";
+#endif
+ sancov_plugin_pass_info.ref_pass_instance_number = 0;
+ sancov_plugin_pass_info.pos_op = PASS_POS_INSERT_BEFORE;
+
+ if (!plugin_default_version_check(version, &gcc_version)) {
+ error(G_("incompatible gcc/plugin versions"));
+ return 1;
+ }
+
+ for (i = 0; i < argc; ++i) {
+ if (!strcmp(argv[i].key, "no-sancov")) {
+ enable = false;
+ continue;
+ }
+ error(G_("unkown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key);
+ }
+
+ register_callback(plugin_name, PLUGIN_INFO, NULL, &sancov_plugin_info);
+
+ if (!enable)
+ return 0;
+
+#if BUILDING_GCC_VERSION < 6000
+ register_callback(plugin_name, PLUGIN_START_UNIT, &sancov_start_unit, NULL);
+ register_callback(plugin_name, PLUGIN_REGISTER_GGC_ROOTS, NULL, (void *)>_ggc_r_gt_sancov);
+ register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &sancov_plugin_pass_info);
+#endif
+
+ return 0;
+}
--
2.4.1
On Fri, Apr 22, 2016 at 8:27 PM, Emese Revfy <[email protected]> wrote:
> The sancov gcc plugin inserts a __sanitizer_cov_trace_pc() call
> at the start of basic blocks.
>
> This plugin is a helper plugin for the kcov feature. It supports
> all gcc versions with plugin support (from gcc-4.5 on).
> It is based on the gcc commit "Add fuzzing coverage support" by Dmitry Vyukov
> (https://gcc.gnu.org/viewcvs/gcc?limit_changes=0&view=revision&revision=231296).
+syzkaller mailing list
> Signed-off-by: Emese Revfy <[email protected]>
> ---
> Makefile | 10 +--
> arch/Kconfig | 9 +++
> arch/x86/purgatory/Makefile | 2 +
> lib/Kconfig.debug | 2 +
> scripts/Makefile.gcc-plugins | 18 +++++
> scripts/gcc-plugins/Makefile | 5 ++
> scripts/gcc-plugins/sancov_plugin.c | 144 ++++++++++++++++++++++++++++++++++++
> 7 files changed, 181 insertions(+), 9 deletions(-)
> create mode 100644 scripts/gcc-plugins/sancov_plugin.c
>
> diff --git a/Makefile b/Makefile
> index 22f0e1b..f09f2bf 100644
> --- a/Makefile
> +++ b/Makefile
> @@ -365,7 +365,7 @@ LDFLAGS_MODULE =
> CFLAGS_KERNEL =
> AFLAGS_KERNEL =
> CFLAGS_GCOV = -fprofile-arcs -ftest-coverage
> -CFLAGS_KCOV = -fsanitize-coverage=trace-pc
> +CFLAGS_KCOV := $(call cc-option,-fsanitize-coverage=trace-pc,)
>
>
> # Use USERINCLUDE when you must reference the UAPI directories only.
> @@ -685,14 +685,6 @@ endif
> endif
> KBUILD_CFLAGS += $(stackp-flag)
>
> -ifdef CONFIG_KCOV
> - ifeq ($(call cc-option, $(CFLAGS_KCOV)),)
> - $(warning Cannot use CONFIG_KCOV: \
> - -fsanitize-coverage=trace-pc is not supported by compiler)
> - CFLAGS_KCOV =
> - endif
> -endif
> -
> ifeq ($(cc-name),clang)
> KBUILD_CPPFLAGS += $(call cc-option,-Qunused-arguments,)
> KBUILD_CPPFLAGS += $(call cc-option,-Wno-unknown-warning-option,)
> diff --git a/arch/Kconfig b/arch/Kconfig
> index e783429..5d856c8 100644
> --- a/arch/Kconfig
> +++ b/arch/Kconfig
> @@ -380,6 +380,15 @@ config GCC_PLUGIN_CYC_COMPLEXITY
> N = the number of nodes
> P = the number of connected components (exit nodes).
>
> +config GCC_PLUGIN_SANCOV
> + bool
> + depends on GCC_PLUGINS
> + help
> + This plugin inserts a __sanitizer_cov_trace_pc() call at the start of
> + basic blocks. It supports all gcc versions with plugin support (from
> + gcc-4.5 on). It is based on the commit "Add fuzzing coverage support"
> + by Dmitry Vyukov <[email protected]>.
> +
> config HAVE_CC_STACKPROTECTOR
> bool
> help
> diff --git a/arch/x86/purgatory/Makefile b/arch/x86/purgatory/Makefile
> index 12734a9..ac58c16 100644
> --- a/arch/x86/purgatory/Makefile
> +++ b/arch/x86/purgatory/Makefile
> @@ -8,6 +8,8 @@ PURGATORY_OBJS = $(addprefix $(obj)/,$(purgatory-y))
> LDFLAGS_purgatory.ro := -e purgatory_start -r --no-undefined -nostdlib -z nodefaultlib
> targets += purgatory.ro
>
> +KCOV_INSTRUMENT := n
> +
> # Default KBUILD_CFLAGS can have -pg option set when FTRACE is enabled. That
> # in turn leaves some undefined symbols like __fentry__ in purgatory and not
> # sure how to relocate those. Like kexec-tools, use custom flags.
> diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
> index 4fff4b0..616f7ed 100644
> --- a/lib/Kconfig.debug
> +++ b/lib/Kconfig.debug
> @@ -708,6 +708,8 @@ config KCOV
> bool "Code coverage for fuzzing"
> depends on ARCH_HAS_KCOV
> select DEBUG_FS
> + select GCC_PLUGINS
> + select GCC_PLUGIN_SANCOV
> help
> KCOV exposes kernel code coverage information in a form suitable
> for coverage-guided fuzzing (randomized testing).
> diff --git a/scripts/Makefile.gcc-plugins b/scripts/Makefile.gcc-plugins
> index 282d63a..33ab13e 100644
> --- a/scripts/Makefile.gcc-plugins
> +++ b/scripts/Makefile.gcc-plugins
> @@ -2,8 +2,23 @@ ifdef CONFIG_GCC_PLUGINS
> __PLUGINCC := $(call cc-ifversion, -ge, 0408, $(HOSTCXX), $(HOSTCC))
> PLUGINCC := $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-plugin.sh "$(__PLUGINCC)" "$(HOSTCXX)" "$(CC)")
>
> + SANCOV_PLUGIN := -fplugin=$(objtree)/scripts/gcc-plugins/sancov_plugin.so
> +
> gcc-plugin-$(CONFIG_GCC_PLUGIN_CYC_COMPLEXITY) += cyc_complexity_plugin.so
>
> + ifdef CONFIG_GCC_PLUGIN_SANCOV
> + ifeq ($(CFLAGS_KCOV),)
> + # It is needed because of the gcc-plugin.sh and gcc version checks.
> + gcc-plugin-$(CONFIG_GCC_PLUGIN_SANCOV) += sancov_plugin.so
> +
> + ifneq ($(PLUGINCC),)
> + CFLAGS_KCOV := $(SANCOV_PLUGIN)
> + else
> + $(error Cannot use CONFIG_KCOV: -fsanitize-coverage=trace-pc is not supported by compiler)
> + endif
> + endif
> + endif
> +
> GCC_PLUGINS_CFLAGS := $(addprefix -fplugin=$(objtree)/scripts/gcc-plugins/, $(gcc-plugin-y))
>
> ifeq ($(PLUGINCC),)
> @@ -15,6 +30,9 @@ ifdef CONFIG_GCC_PLUGINS
> $(error error, your gcc version does not support plugins, you should upgrade it to gcc 4.5 at least)
> endif
> endif
> + else
> + # SANCOV_PLUGIN can be only in CFLAGS_KCOV because avoid duplication.
> + GCC_PLUGINS_CFLAGS := $(filter-out $(SANCOV_PLUGIN), $(GCC_PLUGINS_CFLAGS))
> endif
>
> KBUILD_CFLAGS += $(GCC_PLUGINS_CFLAGS)
> diff --git a/scripts/gcc-plugins/Makefile b/scripts/gcc-plugins/Makefile
> index 31c72bf..79164c1 100644
> --- a/scripts/gcc-plugins/Makefile
> +++ b/scripts/gcc-plugins/Makefile
> @@ -14,6 +14,11 @@ export GCCPLUGINS_DIR HOSTLIBS
>
> $(HOSTLIBS)-$(CONFIG_GCC_PLUGIN_CYC_COMPLEXITY) := cyc_complexity_plugin.so
>
> +ifeq ($(CFLAGS_KCOV), -fplugin=$(objtree)/scripts/gcc-plugins/sancov_plugin.so)
> + $(HOSTLIBS)-$(CONFIG_GCC_PLUGIN_SANCOV) += sancov_plugin.so
> +endif
> +
> always := $($(HOSTLIBS)-y)
>
> cyc_complexity_plugin-objs := cyc_complexity_plugin.o
> +sancov_plugin-objs := sancov_plugin.o
> diff --git a/scripts/gcc-plugins/sancov_plugin.c b/scripts/gcc-plugins/sancov_plugin.c
> new file mode 100644
> index 0000000..aedd611
> --- /dev/null
> +++ b/scripts/gcc-plugins/sancov_plugin.c
> @@ -0,0 +1,144 @@
> +/*
> + * Copyright 2011-2016 by Emese Revfy <[email protected]>
> + * Licensed under the GPL v2, or (at your option) v3
> + *
> + * Homepage:
> + * https://github.com/ephox-gcc-plugins/sancov
> + *
> + * This plugin inserts a __sanitizer_cov_trace_pc() call at the start of basic blocks.
> + * It supports all gcc versions with plugin support (from gcc-4.5 on).
> + * It is based on the commit "Add fuzzing coverage support" by Dmitry Vyukov <[email protected]>.
> + *
> + * You can read about it more here:
> + * https://gcc.gnu.org/viewcvs/gcc?limit_changes=0&view=revision&revision=231296
> + * http://lwn.net/Articles/674854/
> + * https://github.com/google/syzkaller
> + * https://lwn.net/Articles/677764/
> + *
> + * Usage:
> + * make run
> + */
> +
> +#include "gcc-common.h"
> +
> +int plugin_is_GPL_compatible;
> +
> +tree sancov_fndecl;
> +
> +static struct plugin_info sancov_plugin_info = {
> + .version = "20160402",
> + .help = "sancov plugin\n",
> +};
> +
> +static unsigned int sancov_execute(void)
> +{
> + basic_block bb;
> +
> + /* Remove this line when this plugin and kcov will be in the kernel.
> + if (!strcmp(DECL_NAME_POINTER(current_function_decl), DECL_NAME_POINTER(sancov_fndecl)))
> + return 0;
> + */
> +
> + FOR_EACH_BB_FN(bb, cfun) {
> + const_gimple stmt;
> + gcall *gcall;
> + gimple_stmt_iterator gsi = gsi_after_labels(bb);
> +
> + if (gsi_end_p(gsi))
> + continue;
> +
> + stmt = gsi_stmt(gsi);
> + gcall = as_a_gcall(gimple_build_call(sancov_fndecl, 0));
> + gimple_set_location(gcall, gimple_location(stmt));
> + gsi_insert_before(&gsi, gcall, GSI_SAME_STMT);
> + }
> + return 0;
> +}
> +
> +#define PASS_NAME sancov
> +
> +#define NO_GATE
> +#define TODO_FLAGS_FINISH TODO_dump_func | TODO_verify_stmts | TODO_update_ssa_no_phi | TODO_verify_flow
> +
> +#include "gcc-generate-gimple-pass.h"
> +
> +static void sancov_start_unit(void __unused *gcc_data, void __unused *user_data)
> +{
> + tree leaf_attr, nothrow_attr;
> + tree BT_FN_VOID = build_function_type_list(void_type_node, NULL_TREE);
> +
> + sancov_fndecl = build_fn_decl("__sanitizer_cov_trace_pc", BT_FN_VOID);
> +
> + DECL_ASSEMBLER_NAME(sancov_fndecl);
> + TREE_PUBLIC(sancov_fndecl) = 1;
> + DECL_EXTERNAL(sancov_fndecl) = 1;
> + DECL_ARTIFICIAL(sancov_fndecl) = 1;
> + DECL_PRESERVE_P(sancov_fndecl) = 1;
> + DECL_UNINLINABLE(sancov_fndecl) = 1;
> + TREE_USED(sancov_fndecl) = 1;
> +
> + nothrow_attr = tree_cons(get_identifier("nothrow"), NULL, NULL);
> + decl_attributes(&sancov_fndecl, nothrow_attr, 0);
> + gcc_assert(TREE_NOTHROW(sancov_fndecl));
> +#if BUILDING_GCC_VERSION > 4005
> + leaf_attr = tree_cons(get_identifier("leaf"), NULL, NULL);
> + decl_attributes(&sancov_fndecl, leaf_attr, 0);
> +#endif
> +}
> +
> +int plugin_init(struct plugin_name_args *plugin_info, struct plugin_gcc_version *version)
> +{
> + int i;
> + struct register_pass_info sancov_plugin_pass_info;
> + const char * const plugin_name = plugin_info->base_name;
> + const int argc = plugin_info->argc;
> + const struct plugin_argument * const argv = plugin_info->argv;
> + bool enable = true;
> +
> + static const struct ggc_root_tab gt_ggc_r_gt_sancov[] = {
> + {
> + .base = &sancov_fndecl,
> + .nelt = 1,
> + .stride = sizeof(sancov_fndecl),
> + .cb = >_ggc_mx_tree_node,
> + .pchw = >_pch_nx_tree_node
> + },
> + LAST_GGC_ROOT_TAB
> + };
> +
> + /* BBs can be split afterwards?? */
> + sancov_plugin_pass_info.pass = make_sancov_pass();
> +#if BUILDING_GCC_VERSION >= 4009
> + sancov_plugin_pass_info.reference_pass_name = "asan";
> +#else
> + sancov_plugin_pass_info.reference_pass_name = "nrv";
> +#endif
> + sancov_plugin_pass_info.ref_pass_instance_number = 0;
> + sancov_plugin_pass_info.pos_op = PASS_POS_INSERT_BEFORE;
> +
> + if (!plugin_default_version_check(version, &gcc_version)) {
> + error(G_("incompatible gcc/plugin versions"));
> + return 1;
> + }
> +
> + for (i = 0; i < argc; ++i) {
> + if (!strcmp(argv[i].key, "no-sancov")) {
> + enable = false;
> + continue;
> + }
> + error(G_("unkown option '-fplugin-arg-%s-%s'"), plugin_name, argv[i].key);
> + }
> +
> + register_callback(plugin_name, PLUGIN_INFO, NULL, &sancov_plugin_info);
> +
> + if (!enable)
> + return 0;
> +
> +#if BUILDING_GCC_VERSION < 6000
> + register_callback(plugin_name, PLUGIN_START_UNIT, &sancov_start_unit, NULL);
> + register_callback(plugin_name, PLUGIN_REGISTER_GGC_ROOTS, NULL, (void *)>_ggc_r_gt_sancov);
> + register_callback(plugin_name, PLUGIN_PASS_MANAGER_SETUP, NULL, &sancov_plugin_pass_info);
> +#endif
> +
> + return 0;
> +}
> --
> 2.4.1
>
On Fri, Apr 22, 2016 at 11:19 AM, Emese Revfy <[email protected]> wrote:
> This patch set introduce the GCC plugin infrastructure with examples for testing
> and documentation.
>
> GCC plugins are loadable modules that provide extra features to the compiler.
> They are useful for runtime instrumentation and static analysis.
>
> The infrastructure supports all gcc versions from 4.5 to 6.0, building
> out-of-tree modules and building in a separate directory. Cross-compilation
> is supported too but currently only the x86, arm and arm64 architectures enables plugins.
>
> This infrastructure was ported from grsecurity/PaX. It is a CII project
> supported by the Linux Foundation.
>
> Emese Revfy (6):
> Shared library support
> GCC plugin infrastructure
> The GCC plugin infrastructure supports the arm and arm64 architectures too
> Add Cyclomatic complexity plugin
> Documentations of the GCC plugin infrastructre
> Add sancov plugin
>
>
> Changes from v6:
> * Disable the sancov plugin whenever KCOV_INSTRUMENT is disabled
> (Reported-by: Huang Ying <[email protected]>)
> * Disable KCOV/sancov plugin because this is not a regular kernel code
> (Reported-by: Huang Ying <[email protected]>)
> * Removed unnecessary gcc plugin cflags
> (Signed-off-by: Masahiro Yamada <[email protected]>)
> * Removed unnecessary gcc plugin aflags
>
> Changes from v5:
> * Set important properties on the external fndecl (Add sancov plugin)
> * Revert documentation change too (Shared library support)
> (Suggested-by: Kees Cook <[email protected]>)
> * The GCC plugin infrastructure now supports the arm and arm64 architectures too
> (Signed-off-by: David Brown <[email protected]>)
> * Simplify the computation of PLUGINCC (GCC plugin infrastructure)
> (Suggested-by: Masahiro Yamada <[email protected]>)
> * Simplify the invocation of gcc-plugin.sh (GCC plugin infrastructure)
> (Suggested-by: Masahiro Yamada <[email protected]>)
> * Make use of multi-depend (Shared library support)
> (Suggested-by: Masahiro Yamada <[email protected]>)
> * Remove unnecessary exports (GCC plugin infrastructure)
> (Suggested-by: Masahiro Yamada <[email protected]>)
> * Simplify Makefile by using addprefix (GCC plugin infrastructure)
> (Suggested-by: Masahiro Yamada <[email protected]>)
> * Moved the gcc plugins from tools/ to scripts/ (GCC plugin infrastructure)
> (Suggested-by: Masahiro Yamada <[email protected]>)
> * Removed plugins from KBUILD_CFLAGS_32 (GCC plugin infrastructure)
> * Remove gcc-plugin target everywhere
> (Suggested-by and partly Written-by: Masahiro Yamada <[email protected]>)
> * There is no leaf gcc attribute in gcc-4.5 (Add sancov plugin)
> * Added support to the sancov plugin with kcov (Add sancov plugin)
>
> Changes from v4:
> * Moved shared library support from the GCC plugin infrastructure patch into
> a different patch
> * Update gcc-*.h from PaX
> * Fixed gcc-common.h for gcc 6
> * Added pass cloning support to the gcc pass generators
> * Disable all plugins in vdso because it is userland code
> * Add sancov gcc plugin: another use case for gcc plugin support in the kernel
> is when there is a feature in the latest gcc version and we would like to use
> it with older gcc versions as well (e.g., distros).
>
> Changes from v3:
> * Fix some indentation related warnings
> (Suggested by checkpatch.pl)
> * Add maintainer entries
> * Don't run gcc_plugin.sh when the GCC_PLUGINS option is disabled or unsupported
> (Reported-by: Fengguang Wu <[email protected]>)
>
> Changes from v2:
> * Fixed incorrectly encoded characters
> * Generate the GIMPLE, IPA, SIMPLE_IPA and RTL pass structures
> (Suggested-by: Rasmus Villemoes <[email protected]>)
> * Write plugin related warning messages to stderr instead of stdout
> (Suggested-by: Kees Cook <[email protected]>)
> * Mention the installation of the gcc plugin headers (Documentation)
>
> Changes from v1:
> * Move the gcc-plugins make target into a separate Makefile because there may
> be a lot of plugins (Suggested-by: Rasmus Villemoes)
> * Simplify the dependencies of the plugin related config option
> (Suggested-by: Kees Cook <[email protected]>)
> * Removed the unnecessary example plugin
This looks really good to me! Masahiro are there any other things you
see here that need fixing? Michal, does this look like it's ready for
-next? I'd be happy to carry it via one of my trees if you want.
-Kees
>
> ---
> Documentation/dontdiff | 1 +
> Documentation/gcc-plugins.txt | 83 +++
> Documentation/kbuild/makefiles.txt | 39 +-
> Documentation/kernel-parameters.txt | 5 +
> MAINTAINERS | 8 +
> Makefile | 25 +-
> arch/Kconfig | 36 +
> arch/arm/Kconfig | 1 +
> arch/arm64/Kconfig | 1 +
> arch/x86/Kconfig | 1 +
> arch/x86/entry/vdso/Makefile | 3 +-
> arch/x86/purgatory/Makefile | 2 +
> lib/Kconfig.debug | 2 +
> scripts/Makefile | 2 +-
> scripts/Makefile.build | 2 +-
> scripts/Makefile.clean | 3 +-
> scripts/Makefile.gcc-plugins | 40 +
> scripts/Makefile.host | 70 +-
> scripts/gcc-plugin.sh | 51 ++
> scripts/gcc-plugins/Makefile | 24 +
> scripts/gcc-plugins/cyc_complexity_plugin.c | 73 ++
> scripts/gcc-plugins/gcc-common.h | 830 +++++++++++++++++++++
> scripts/gcc-plugins/gcc-generate-gimple-pass.h | 175 +++++
> scripts/gcc-plugins/gcc-generate-ipa-pass.h | 289 +++++++
> scripts/gcc-plugins/gcc-generate-rtl-pass.h | 175 +++++
> scripts/gcc-plugins/gcc-generate-simple_ipa-pass.h | 175 +++++
> scripts/gcc-plugins/sancov_plugin.c | 144 ++++
> scripts/link-vmlinux.sh | 2 +-
> scripts/package/builddeb | 1 +
> 29 files changed, 2239 insertions(+), 25 deletions(-)
--
Kees Cook
Chrome OS & Brillo Security
2016-04-27 5:40 GMT+09:00 Kees Cook <[email protected]>:
> On Fri, Apr 22, 2016 at 11:19 AM, Emese Revfy <[email protected]> wrote:
>> This patch set introduce the GCC plugin infrastructure with examples for testing
>> and documentation.
>>
>> GCC plugins are loadable modules that provide extra features to the compiler.
>> They are useful for runtime instrumentation and static analysis.
>>
>> The infrastructure supports all gcc versions from 4.5 to 6.0, building
>> out-of-tree modules and building in a separate directory. Cross-compilation
>> is supported too but currently only the x86, arm and arm64 architectures enables plugins.
>>
>> This infrastructure was ported from grsecurity/PaX. It is a CII project
>> supported by the Linux Foundation.
>>
>> Emese Revfy (6):
>> Shared library support
>> GCC plugin infrastructure
>> The GCC plugin infrastructure supports the arm and arm64 architectures too
>> Add Cyclomatic complexity plugin
>> Documentations of the GCC plugin infrastructre
>> Add sancov plugin
>>
>>
>> Changes from v6:
>> * Disable the sancov plugin whenever KCOV_INSTRUMENT is disabled
>> (Reported-by: Huang Ying <[email protected]>)
>> * Disable KCOV/sancov plugin because this is not a regular kernel code
>> (Reported-by: Huang Ying <[email protected]>)
>> * Removed unnecessary gcc plugin cflags
>> (Signed-off-by: Masahiro Yamada <[email protected]>)
>> * Removed unnecessary gcc plugin aflags
>>
>> Changes from v5:
>> * Set important properties on the external fndecl (Add sancov plugin)
>> * Revert documentation change too (Shared library support)
>> (Suggested-by: Kees Cook <[email protected]>)
>> * The GCC plugin infrastructure now supports the arm and arm64 architectures too
>> (Signed-off-by: David Brown <[email protected]>)
>> * Simplify the computation of PLUGINCC (GCC plugin infrastructure)
>> (Suggested-by: Masahiro Yamada <[email protected]>)
>> * Simplify the invocation of gcc-plugin.sh (GCC plugin infrastructure)
>> (Suggested-by: Masahiro Yamada <[email protected]>)
>> * Make use of multi-depend (Shared library support)
>> (Suggested-by: Masahiro Yamada <[email protected]>)
>> * Remove unnecessary exports (GCC plugin infrastructure)
>> (Suggested-by: Masahiro Yamada <[email protected]>)
>> * Simplify Makefile by using addprefix (GCC plugin infrastructure)
>> (Suggested-by: Masahiro Yamada <[email protected]>)
>> * Moved the gcc plugins from tools/ to scripts/ (GCC plugin infrastructure)
>> (Suggested-by: Masahiro Yamada <[email protected]>)
>> * Removed plugins from KBUILD_CFLAGS_32 (GCC plugin infrastructure)
>> * Remove gcc-plugin target everywhere
>> (Suggested-by and partly Written-by: Masahiro Yamada <[email protected]>)
>> * There is no leaf gcc attribute in gcc-4.5 (Add sancov plugin)
>> * Added support to the sancov plugin with kcov (Add sancov plugin)
>>
>> Changes from v4:
>> * Moved shared library support from the GCC plugin infrastructure patch into
>> a different patch
>> * Update gcc-*.h from PaX
>> * Fixed gcc-common.h for gcc 6
>> * Added pass cloning support to the gcc pass generators
>> * Disable all plugins in vdso because it is userland code
>> * Add sancov gcc plugin: another use case for gcc plugin support in the kernel
>> is when there is a feature in the latest gcc version and we would like to use
>> it with older gcc versions as well (e.g., distros).
>>
>> Changes from v3:
>> * Fix some indentation related warnings
>> (Suggested by checkpatch.pl)
>> * Add maintainer entries
>> * Don't run gcc_plugin.sh when the GCC_PLUGINS option is disabled or unsupported
>> (Reported-by: Fengguang Wu <[email protected]>)
>>
>> Changes from v2:
>> * Fixed incorrectly encoded characters
>> * Generate the GIMPLE, IPA, SIMPLE_IPA and RTL pass structures
>> (Suggested-by: Rasmus Villemoes <[email protected]>)
>> * Write plugin related warning messages to stderr instead of stdout
>> (Suggested-by: Kees Cook <[email protected]>)
>> * Mention the installation of the gcc plugin headers (Documentation)
>>
>> Changes from v1:
>> * Move the gcc-plugins make target into a separate Makefile because there may
>> be a lot of plugins (Suggested-by: Rasmus Villemoes)
>> * Simplify the dependencies of the plugin related config option
>> (Suggested-by: Kees Cook <[email protected]>)
>> * Removed the unnecessary example plugin
>
> This looks really good to me! Masahiro are there any other things you
> see here that need fixing? Michal, does this look like it's ready for
> -next? I'd be happy to carry it via one of my trees if you want.
I am busy these days, but hopefully I will manage to find some time
to review this series this weekend.
--
Best Regards
Masahiro Yamada