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1 /* Functions for CET/x86.
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2 Copyright (C) 2017 Free Software Foundation, Inc.
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3
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4 This file is part of GCC.
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5
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6 GCC is free software; you can redistribute it and/or modify
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7 it under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 GCC is distributed in the hope that it will be useful,
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12 but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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14 GNU General Public License for more details.
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15
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16 You should have received a copy of the GNU General Public License
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17 along with GCC; see the file COPYING3. If not see
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18 <http://www.gnu.org/licenses/>. */
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19
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20 #include "config.h"
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21 #include "system.h"
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22 #include "coretypes.h"
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23 #include "tm.h"
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24 #include "output.h"
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25 #include "linux-common.h"
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26
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27 void
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28 file_end_indicate_exec_stack_and_cet (void)
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29 {
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30 file_end_indicate_exec_stack ();
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31
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32 if (flag_cf_protection == CF_NONE)
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33 return;
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34
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35 unsigned int feature_1 = 0;
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36
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37 if (TARGET_IBT)
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38 /* GNU_PROPERTY_X86_FEATURE_1_IBT. */
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39 feature_1 |= 0x1;
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40
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41 if (TARGET_SHSTK)
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42 /* GNU_PROPERTY_X86_FEATURE_1_SHSTK. */
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43 feature_1 |= 0x2;
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44
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45 if (feature_1)
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46 {
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47 int p2align = ptr_mode == SImode ? 2 : 3;
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48
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49 /* Generate GNU_PROPERTY_X86_FEATURE_1_XXX. */
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50 switch_to_section (get_section (".note.gnu.property",
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51 SECTION_NOTYPE, NULL));
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52
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53 ASM_OUTPUT_ALIGN (asm_out_file, p2align);
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54 /* name length. */
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55 fprintf (asm_out_file, ASM_LONG " 1f - 0f\n");
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56 /* data length. */
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57 fprintf (asm_out_file, ASM_LONG " 4f - 1f\n");
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58 /* note type: NT_GNU_PROPERTY_TYPE_0. */
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59 fprintf (asm_out_file, ASM_LONG " 5\n");
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60 ASM_OUTPUT_LABEL (asm_out_file, "0");
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61 /* vendor name: "GNU". */
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62 fprintf (asm_out_file, STRING_ASM_OP " \"GNU\"\n");
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63 ASM_OUTPUT_LABEL (asm_out_file, "1");
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64 ASM_OUTPUT_ALIGN (asm_out_file, p2align);
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65 /* pr_type: GNU_PROPERTY_X86_FEATURE_1_AND. */
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66 fprintf (asm_out_file, ASM_LONG " 0xc0000002\n");
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67 /* pr_datasz. */\
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68 fprintf (asm_out_file, ASM_LONG " 3f - 2f\n");
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69 ASM_OUTPUT_LABEL (asm_out_file, "2");
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70 /* GNU_PROPERTY_X86_FEATURE_1_XXX. */
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71 fprintf (asm_out_file, ASM_LONG " 0x%x\n", feature_1);
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72 ASM_OUTPUT_LABEL (asm_out_file, "3");
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73 ASM_OUTPUT_ALIGN (asm_out_file, p2align);
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74 ASM_OUTPUT_LABEL (asm_out_file, "4");
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75 }
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76 }
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