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6b90bd4ba4
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.
Currently the x86, arm, arm64 and uml architectures enable plugins.
The directory of the gcc plugins is scripts/gcc-plugins. 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
scripts/gcc-plugins/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.
Based on work created by the PaX Team.
Signed-off-by: Emese Revfy <re.emese@gmail.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Michal Marek <mmarek@suse.com>
176 lines
4.1 KiB
C++
176 lines
4.1 KiB
C++
/*
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* Generator for SIMPLE_IPA pass related boilerplate code/data
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*
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* Supports gcc 4.5-6
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*
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* Usage:
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*
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* 1. before inclusion define PASS_NAME
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* 2. before inclusion define NO_* for unimplemented callbacks
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* NO_GATE
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* NO_EXECUTE
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* 3. before inclusion define PROPERTIES_* and TODO_FLAGS_* to override
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* the default 0 values
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* 4. for convenience, all the above will be undefined after inclusion!
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* 5. the only exported name is make_PASS_NAME_pass() to register with gcc
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*/
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#ifndef PASS_NAME
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#error at least PASS_NAME must be defined
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#else
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#define __GCC_PLUGIN_STRINGIFY(n) #n
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#define _GCC_PLUGIN_STRINGIFY(n) __GCC_PLUGIN_STRINGIFY(n)
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#define _GCC_PLUGIN_CONCAT2(x, y) x ## y
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#define _GCC_PLUGIN_CONCAT3(x, y, z) x ## y ## z
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#define __PASS_NAME_PASS_DATA(n) _GCC_PLUGIN_CONCAT2(n, _pass_data)
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#define _PASS_NAME_PASS_DATA __PASS_NAME_PASS_DATA(PASS_NAME)
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#define __PASS_NAME_PASS(n) _GCC_PLUGIN_CONCAT2(n, _pass)
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#define _PASS_NAME_PASS __PASS_NAME_PASS(PASS_NAME)
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#define _PASS_NAME_NAME _GCC_PLUGIN_STRINGIFY(PASS_NAME)
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#define __MAKE_PASS_NAME_PASS(n) _GCC_PLUGIN_CONCAT3(make_, n, _pass)
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#define _MAKE_PASS_NAME_PASS __MAKE_PASS_NAME_PASS(PASS_NAME)
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#ifdef NO_GATE
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#define _GATE NULL
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#define _HAS_GATE false
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#else
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#define __GATE(n) _GCC_PLUGIN_CONCAT2(n, _gate)
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#define _GATE __GATE(PASS_NAME)
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#define _HAS_GATE true
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#endif
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#ifdef NO_EXECUTE
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#define _EXECUTE NULL
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#define _HAS_EXECUTE false
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#else
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#define __EXECUTE(n) _GCC_PLUGIN_CONCAT2(n, _execute)
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#define _EXECUTE __EXECUTE(PASS_NAME)
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#define _HAS_EXECUTE true
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#endif
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#ifndef PROPERTIES_REQUIRED
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#define PROPERTIES_REQUIRED 0
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#endif
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#ifndef PROPERTIES_PROVIDED
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#define PROPERTIES_PROVIDED 0
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#endif
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#ifndef PROPERTIES_DESTROYED
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#define PROPERTIES_DESTROYED 0
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#endif
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#ifndef TODO_FLAGS_START
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#define TODO_FLAGS_START 0
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#endif
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#ifndef TODO_FLAGS_FINISH
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#define TODO_FLAGS_FINISH 0
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#endif
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#if BUILDING_GCC_VERSION >= 4009
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namespace {
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static const pass_data _PASS_NAME_PASS_DATA = {
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#else
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static struct simple_ipa_opt_pass _PASS_NAME_PASS = {
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.pass = {
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#endif
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.type = SIMPLE_IPA_PASS,
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.name = _PASS_NAME_NAME,
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#if BUILDING_GCC_VERSION >= 4008
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.optinfo_flags = OPTGROUP_NONE,
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#endif
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#if BUILDING_GCC_VERSION >= 5000
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#elif BUILDING_GCC_VERSION == 4009
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.has_gate = _HAS_GATE,
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.has_execute = _HAS_EXECUTE,
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#else
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.gate = _GATE,
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.execute = _EXECUTE,
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.sub = NULL,
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.next = NULL,
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.static_pass_number = 0,
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#endif
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.tv_id = TV_NONE,
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.properties_required = PROPERTIES_REQUIRED,
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.properties_provided = PROPERTIES_PROVIDED,
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.properties_destroyed = PROPERTIES_DESTROYED,
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.todo_flags_start = TODO_FLAGS_START,
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.todo_flags_finish = TODO_FLAGS_FINISH,
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#if BUILDING_GCC_VERSION < 4009
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}
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#endif
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};
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#if BUILDING_GCC_VERSION >= 4009
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class _PASS_NAME_PASS : public simple_ipa_opt_pass {
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public:
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_PASS_NAME_PASS() : simple_ipa_opt_pass(_PASS_NAME_PASS_DATA, g) {}
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#ifndef NO_GATE
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#if BUILDING_GCC_VERSION >= 5000
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virtual bool gate(function *) { return _GATE(); }
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#else
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virtual bool gate(void) { return _GATE(); }
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#endif
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#endif
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virtual opt_pass *clone() { return new _PASS_NAME_PASS(); }
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#ifndef NO_EXECUTE
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#if BUILDING_GCC_VERSION >= 5000
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virtual unsigned int execute(function *) { return _EXECUTE(); }
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#else
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virtual unsigned int execute(void) { return _EXECUTE(); }
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#endif
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#endif
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};
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}
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opt_pass *_MAKE_PASS_NAME_PASS(void)
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{
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return new _PASS_NAME_PASS();
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}
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#else
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struct opt_pass *_MAKE_PASS_NAME_PASS(void)
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{
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return &_PASS_NAME_PASS.pass;
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}
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#endif
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/* clean up user provided defines */
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#undef PASS_NAME
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#undef NO_GATE
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#undef NO_EXECUTE
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#undef PROPERTIES_DESTROYED
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#undef PROPERTIES_PROVIDED
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#undef PROPERTIES_REQUIRED
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#undef TODO_FLAGS_FINISH
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#undef TODO_FLAGS_START
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/* clean up generated defines */
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#undef _EXECUTE
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#undef __EXECUTE
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#undef _GATE
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#undef __GATE
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#undef _GCC_PLUGIN_CONCAT2
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#undef _GCC_PLUGIN_CONCAT3
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#undef _GCC_PLUGIN_STRINGIFY
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#undef __GCC_PLUGIN_STRINGIFY
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#undef _HAS_EXECUTE
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#undef _HAS_GATE
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#undef _MAKE_PASS_NAME_PASS
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#undef __MAKE_PASS_NAME_PASS
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#undef _PASS_NAME_NAME
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#undef _PASS_NAME_PASS
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#undef __PASS_NAME_PASS
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#undef _PASS_NAME_PASS_DATA
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#undef __PASS_NAME_PASS_DATA
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#endif /* PASS_NAME */
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