Line data    Source code

       1              : /* Functions for x86 GNU property.
       2              :    Copyright (C) 2017-2026 Free Software Foundation, Inc.
       3              : 
       4              : This file is part of GCC.
       5              : 
       6              : GCC is free software; you can redistribute it and/or modify
       7              : it under the terms of the GNU General Public License as published by
       8              : the Free Software Foundation; either version 3, or (at your option)
       9              : any later version.
      10              : 
      11              : GCC is distributed in the hope that it will be useful,
      12              : but WITHOUT ANY WARRANTY; without even the implied warranty of
      13              : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
      14              : GNU General Public License for more details.
      15              : 
      16              : You should have received a copy of the GNU General Public License
      17              : along with GCC; see the file COPYING3.  If not see
      18              : <http://www.gnu.org/licenses/>.  */
      19              : 
      20              : #include "config.h"
      21              : #include "system.h"
      22              : #include "coretypes.h"
      23              : #include "tm.h"
      24              : #include "output.h"
      25              : #include "linux-common.h"
      26              : #include "i386-protos.h"
      27              : 
      28              : static void
      29        18884 : emit_gnu_property (unsigned int type, unsigned int data)
      30              : {
      31        18884 :   int p2align = ptr_mode == SImode ? 2 : 3;
      32              : 
      33        18884 :   switch_to_section (get_section (".note.gnu.property",
      34              :                                   SECTION_NOTYPE, NULL));
      35              : 
      36        18884 :   ASM_OUTPUT_ALIGN (asm_out_file, p2align);
      37              :   /* name length.  */
      38        18884 :   fprintf (asm_out_file, ASM_LONG "1f - 0f\n");
      39              :   /* data length.  */
      40        18884 :   fprintf (asm_out_file, ASM_LONG "4f - 1f\n");
      41              :   /* note type: NT_GNU_PROPERTY_TYPE_0.  */
      42        18884 :   fprintf (asm_out_file, ASM_LONG "5\n");
      43        18884 :   fprintf (asm_out_file, "0:\n");
      44              :   /* vendor name: "GNU".  */
      45        18884 :   fprintf (asm_out_file, STRING_ASM_OP "\"GNU\"\n");
      46        18884 :   fprintf (asm_out_file, "1:\n");
      47        18884 :   ASM_OUTPUT_ALIGN (asm_out_file, p2align);
      48              :   /* pr_type.  */
      49        18884 :   fprintf (asm_out_file, ASM_LONG "0x%x\n", type);
      50              :   /* pr_datasz.  */
      51        18884 :   fprintf (asm_out_file, ASM_LONG "3f - 2f\n");
      52        18884 :   fprintf (asm_out_file, "2:\n");
      53        18884 :   fprintf (asm_out_file, ASM_LONG "0x%x\n", data);
      54        18884 :   fprintf (asm_out_file, "3:\n");
      55        18884 :   ASM_OUTPUT_ALIGN (asm_out_file, p2align);
      56        18884 :   fprintf (asm_out_file, "4:\n");
      57        18884 : }
      58              : 
      59              : void
      60       242078 : file_end_indicate_exec_stack_and_gnu_property (void)
      61              : {
      62       242078 :   file_end_indicate_exec_stack ();
      63              : 
      64       242078 :   if (flag_cf_protection == CF_NONE
      65       223222 :       && !ix86_needed
      66       223222 :       && !ix86_has_no_direct_extern_access)
      67              :     return;
      68              : 
      69        18885 :   unsigned int feature_1 = 0;
      70              : 
      71        18885 :   if (flag_cf_protection & CF_BRANCH)
      72              :     /* GNU_PROPERTY_X86_FEATURE_1_IBT.  */
      73        18844 :     feature_1 |= 0x1;
      74              : 
      75        18885 :   if (flag_cf_protection & CF_RETURN)
      76              :     /* GNU_PROPERTY_X86_FEATURE_1_SHSTK.  */
      77        18828 :     feature_1 |= 0x2;
      78              : 
      79              :   /* Generate GNU_PROPERTY_X86_FEATURE_1_AND.  */
      80        18885 :   if (feature_1)
      81        18854 :     emit_gnu_property (0xc0000002, feature_1);
      82              : 
      83        18885 :   unsigned int isa_1 = 0;
      84        18885 :   if (ix86_needed)
      85              :     {
      86              :       /* GNU_PROPERTY_X86_ISA_1_BASELINE.  */
      87            1 :       if (TARGET_64BIT
      88            0 :           || TARGET_FXSR
      89            0 :           || TARGET_80387
      90            0 :           || TARGET_MMX
      91            0 :           || TARGET_SSE
      92            0 :           || TARGET_SSE2)
      93            1 :         isa_1 |= 1 << 0;
      94              : 
      95              :       /* GNU_PROPERTY_X86_ISA_1_V2.  */
      96            1 :       if (TARGET_CMPXCHG16B
      97            1 :           || (TARGET_64BIT && TARGET_SAHF)
      98            1 :           || TARGET_POPCNT
      99            1 :           || TARGET_SSE3
     100            1 :           || TARGET_SSSE3
     101            1 :           || TARGET_SSE4_1
     102            1 :           || TARGET_SSE4_2)
     103            0 :         isa_1 |= 1 << 1;
     104              : 
     105              :       /* GNU_PROPERTY_X86_ISA_1_V3.  */
     106            1 :       if (TARGET_AVX
     107            1 :           || TARGET_AVX2
     108            1 :           || TARGET_F16C
     109            1 :           || TARGET_FMA
     110            1 :           || TARGET_LZCNT
     111            1 :           || TARGET_MOVBE
     112            1 :           || TARGET_XSAVE)
     113            0 :         isa_1 |= 1 << 2;
     114              : 
     115              :       /* GNU_PROPERTY_X86_ISA_1_V4.  */
     116            1 :       if (TARGET_AVX512F
     117            1 :           || TARGET_AVX512BW
     118            1 :           || TARGET_AVX512CD
     119            1 :           || TARGET_AVX512DQ
     120            1 :           || TARGET_AVX512VL)
     121            0 :         isa_1 |= 1 << 3;
     122              :     }
     123              : 
     124              :   /* Generate GNU_PROPERTY_X86_ISA_1_NEEDED.  */
     125            1 :   if (isa_1)
     126            1 :     emit_gnu_property (0xc0008002, isa_1);
     127              : 
     128        18885 :   if (ix86_has_no_direct_extern_access)
     129              :     /* Emite a GNU_PROPERTY_1_NEEDED note with
     130              :        GNU_PROPERTY_1_NEEDED_INDIRECT_EXTERN_ACCESS.  */
     131           29 :     emit_gnu_property (0xb0008000, (1U << 0));
     132              : }