From db6b9a9ddb7855f348ea978c392d8ebc258199af Mon Sep 17 00:00:00 2001 From: Andrea Corallo Date: Thu, 7 Apr 2022 11:51:56 +0200 Subject: [PATCH 12/15] arm: implement bti injection Hi all, this patch enables Branch Target Identification Armv8.1-M Mechanism [1]. This is achieved by using the bti pass made common with Aarch64. The pass iterates through the instructions and adds the necessary BTI instructions at the beginning of every function and at every landing pads targeted by indirect jumps. Best Regards Andrea [1] gcc/ChangeLog 2022-04-07 Andrea Corallo * config.gcc (arm*-*-*): Add 'aarch-bti-insert.o' object. * config/arm/arm-protos.h: Update. * config/arm/aarch-common-protos.h: Declare 'aarch_bti_arch_check'. * config/arm/arm.cc (aarch_bti_enabled) Update. (aarch_bti_j_insn_p, aarch_pac_insn_p, aarch_gen_bti_c) (aarch_gen_bti_j, aarch_bti_arch_check): New functions. * config/arm/arm.md (bti_nop): New insn. * config/arm/t-arm (PASSES_EXTRA): Add 'arm-passes.def'. (aarch-bti-insert.o): New target. * config/arm/unspecs.md (VUNSPEC_BTI_NOP): New unspec. * config/arm/aarch-bti-insert.cc (rest_of_insert_bti): Verify arch compatibility. (gate): Make use of 'aarch_bti_arch_check'. * config/arm/arm-passes.def: New file. * config/aarch64/aarch64.cc (aarch_bti_arch_check): New function. gcc/testsuite/ChangeLog 2022-04-07 Andrea Corallo * gcc.target/arm/bti-1.c: New testcase. * gcc.target/arm/bti-2.c: Likewise. --- gcc/config.gcc | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'gcc/config.gcc') diff --git a/gcc/config.gcc b/gcc/config.gcc index 0d5a5ee..a5b0cbc 100644 --- a/gcc/config.gcc +++ b/gcc/config.gcc @@ -362,7 +362,7 @@ arc*-*-*) ;; arm*-*-*) cpu_type=arm - extra_objs="arm-builtins.o arm-mve-builtins.o aarch-common.o" + extra_objs="arm-builtins.o arm-mve-builtins.o aarch-common.o aarch-bti-insert.o" extra_headers="mmintrin.h arm_neon.h arm_acle.h arm_fp16.h arm_cmse.h arm_bf16.h arm_mve_types.h arm_mve.h arm_cde.h" target_type_format_char='%' c_target_objs="arm-c.o" -- cgit v1.1