GCC plugin infrastructure

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>

11 files changed, 1741 insertions, 2 deletions

diff --git a/scripts/Makefile b/scripts/Makefile
index 822ab4a6a4aa..1d80897a9644 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 000000000000..bcc373dcb3b5
--- /dev/null
+++ b/scripts/Makefile.gcc-plugins
@@ -0,0 +1,23 @@
+ifdef CONFIG_GCC_PLUGINS
+  __PLUGINCC := $(call cc-ifversion, -ge, 0408, $(HOSTCXX), $(HOSTCC))
+  PLUGINCC := $(shell $(CONFIG_SHELL) $(srctree)/scripts/gcc-plugin.sh "$(__PLUGINCC)" "$(HOSTCXX)" "$(CC)")
+
+  GCC_PLUGINS_CFLAGS := $(addprefix -fplugin=$(objtree)/scripts/gcc-plugins/, $(gcc-plugin-y))
+
+  export PLUGINCC GCC_PLUGINS_CFLAGS GCC_PLUGIN
+
+  ifeq ($(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)")
+        $(warning warning: your gcc installation does not support plugins, perhaps the necessary headers are missing?)
+      else
+        $(warning warning: 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)
+  GCC_PLUGIN := $(gcc-plugin-y)
+
+endif
diff --git a/scripts/gcc-plugin.sh b/scripts/gcc-plugin.sh
new file mode 100755
index 000000000000..fb9207565471
--- /dev/null
+++ b/scripts/gcc-plugin.sh
@@ -0,0 +1,51 @@
+#!/bin/sh
+srctree=$(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 000000000000..a4c93419d5d1
--- /dev/null
+++ b/scripts/gcc-plugins/Makefile
@@ -0,0 +1,20 @@
+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$(src) -std=gnu++98 -fno-rtti
+  HOST_EXTRACXXFLAGS += -fno-exceptions -fasynchronous-unwind-tables -ggdb
+  HOST_EXTRACXXFLAGS += -Wno-narrowing -Wno-unused-variable
+  export HOST_EXTRACXXFLAGS
+endif
+
+export GCCPLUGINS_DIR HOSTLIBS
+
+$(HOSTLIBS)-y := $(GCC_PLUGIN)
+always := $($(HOSTLIBS)-y)
+
+clean-files += *.so
diff --git a/scripts/gcc-plugins/gcc-common.h b/scripts/gcc-plugins/gcc-common.h
new file mode 100644
index 000000000000..172850bcd0d9
--- /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 000000000000..526c3c79b68e
--- /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 000000000000..9bd926e072f0
--- /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 000000000000..1dc67a5aeadf
--- /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 000000000000..a27e2b36afaa
--- /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 f0f6d9d75435..4f727eb5ec43 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 86e56fef7473..4d4418a8d54d 100755
--- a/scripts/package/builddeb
+++ b/scripts/package/builddeb
@@ -329,6 +329,7 @@ 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 -)