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
4.0 KiB
C++
176 lines
4.0 KiB
C++
/*
|
|
* 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 */
|