/* Functions for CET/x86. Copyright (C) 2017-2020 Free Software Foundation, Inc. This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see <http://www.gnu.org/licenses/>. */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tm.h" #include "output.h" #include "linux-common.h" void file_end_indicate_exec_stack_and_cet (void) { file_end_indicate_exec_stack (); if (flag_cf_protection == CF_NONE) return; unsigned int feature_1 = 0; if (flag_cf_protection & CF_BRANCH) /* GNU_PROPERTY_X86_FEATURE_1_IBT. */ feature_1 |= 0x1; if (flag_cf_protection & CF_RETURN) /* GNU_PROPERTY_X86_FEATURE_1_SHSTK. */ feature_1 |= 0x2; if (feature_1) { int p2align = ptr_mode == SImode ? 2 : 3; /* Generate GNU_PROPERTY_X86_FEATURE_1_XXX. */ switch_to_section (get_section (".note.gnu.property", SECTION_NOTYPE, NULL)); ASM_OUTPUT_ALIGN (asm_out_file, p2align); /* name length. */ fprintf (asm_out_file, ASM_LONG " 1f - 0f\n"); /* data length. */ fprintf (asm_out_file, ASM_LONG " 4f - 1f\n"); /* note type: NT_GNU_PROPERTY_TYPE_0. */ fprintf (asm_out_file, ASM_LONG " 5\n"); fprintf (asm_out_file, "0:\n"); /* vendor name: "GNU". */ fprintf (asm_out_file, STRING_ASM_OP " \"GNU\"\n"); fprintf (asm_out_file, "1:\n"); ASM_OUTPUT_ALIGN (asm_out_file, p2align); /* pr_type: GNU_PROPERTY_X86_FEATURE_1_AND. */ fprintf (asm_out_file, ASM_LONG " 0xc0000002\n"); /* pr_datasz. */\ fprintf (asm_out_file, ASM_LONG " 3f - 2f\n"); fprintf (asm_out_file, "2:\n"); /* GNU_PROPERTY_X86_FEATURE_1_XXX. */ fprintf (asm_out_file, ASM_LONG " 0x%x\n", feature_1); fprintf (asm_out_file, "3:\n"); ASM_OUTPUT_ALIGN (asm_out_file, p2align); fprintf (asm_out_file, "4:\n"); } } |