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authoritsimbal <itsimbal@138bc75d-0d04-0410-961f-82ee72b054a4>2017-10-20 13:09:38 +0000
committeritsimbal <itsimbal@138bc75d-0d04-0410-961f-82ee72b054a4>2017-10-20 13:09:38 +0000
commit3c0f15b4cebccdbb6388a8df5933e69c9b773149 (patch)
tree07ee35844abbf2889c4ed953d998c4fe78bf9dd9 /gcc/gimplify.c
parent3ebb1bac73fedb02994e61b48f1d7e4facf7e17c (diff)
downloadgcc-3c0f15b4cebccdbb6388a8df5933e69c9b773149.tar.gz
Add generic part for Intel CET enabling. The spec is available at
https://software.intel.com/sites/default/files/managed/4d/2a/control-flow-enforcement-technology-preview.pdf A proposal is to introduce a target independent flag -fcf-protection=[none|branch|return|full] with a semantic to instrument a code to control validness or integrity of control-flow transfers using jump and call instructions. The main goal is to detect and block a possible malware execution through transfer the execution to unknown target address. Implementation could be either software or target based. Any target platforms can provide their implementation for instrumentation under this option. The compiler should instrument any control-flow transfer points in a program (ex. call/jmp/ret) as well as any landing pads, which are targets of control-flow transfers. A new 'nocf_check' attribute is introduced to provide hand tuning support. The attribute directs the compiler to skip a call to a function and a function's landing pad from instrumentation. The attribute can be used for function and pointer to function types, otherwise it will be ignored. Currently all platforms except i386 will report the error and do no instrumentation. i386 will provide the implementation based on a specification published by Intel for a new technology called Control-flow Enforcement Technology (CET). gcc/c-family/ * c-attribs.c (handle_nocf_check_attribute): New function. (c_common_attribute_table): Add 'nocf_check' handling. gcc/c/ * gimple-parser.c: Add second argument NULL to gimple_build_call_from_tree. gcc/ * attrib.c (comp_type_attributes): Check nocf_check attribute. * cfgexpand.c (expand_call_stmt): Set REG_CALL_NOCF_CHECK for call insn. * combine.c (distribute_notes): Add REG_CALL_NOCF_CHECK handling. * common.opt: Add fcf-protection flag. * emit-rtl.c (try_split): Add REG_CALL_NOCF_CHECK handling. * flag-types.h: Add enum cf_protection_level. * gimple.c (gimple_build_call_from_tree): Add second parameter. Add 'nocf_check' attribute propagation to gimple call. * gimple.h (gf_mask): Add GF_CALL_NOCF_CHECK. (gimple_build_call_from_tree): Update prototype. (gimple_call_nocf_check_p): New function. (gimple_call_set_nocf_check): Likewise. * gimplify.c: Add second argument to gimple_build_call_from_tree. * ipa-icf.c: Add nocf_check attribute in statement hash. * recog.c (peep2_attempt): Add REG_CALL_NOCF_CHECK handling. * reg-notes.def: Add REG_NOTE (CALL_NOCF_CHECK). * toplev.c (process_options): Add flag_cf_protection handling. git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@253936 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/gimplify.c')
-rw-r--r--gcc/gimplify.c6
1 files changed, 2 insertions, 4 deletions
diff --git a/gcc/gimplify.c b/gcc/gimplify.c
index 2c1ec852210..4c245103fc4 100644
--- a/gcc/gimplify.c
+++ b/gcc/gimplify.c
@@ -3378,8 +3378,7 @@ gimplify_call_expr (tree *expr_p, gimple_seq *pre_p, bool want_value)
/* The CALL_EXPR in *EXPR_P is already in GIMPLE form, so all we
have to do is replicate it as a GIMPLE_CALL tuple. */
gimple_stmt_iterator gsi;
- call = gimple_build_call_from_tree (*expr_p);
- gimple_call_set_fntype (call, TREE_TYPE (fnptrtype));
+ call = gimple_build_call_from_tree (*expr_p, fnptrtype);
notice_special_calls (call);
if (EXPR_CILK_SPAWN (*expr_p))
gimplify_cilk_detach (pre_p);
@@ -5660,8 +5659,7 @@ gimplify_modify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p,
CALL_EXPR_ARG (*from_p, 2));
else
{
- call_stmt = gimple_build_call_from_tree (*from_p);
- gimple_call_set_fntype (call_stmt, TREE_TYPE (fnptrtype));
+ call_stmt = gimple_build_call_from_tree (*from_p, fnptrtype);
}
}
notice_special_calls (call_stmt);