gcc/config/i386/gnu-property.cc

   1 /* Functions for x86 GNU property.
   2    Copyright (C) 2017-2024 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 emit_gnu_property (unsigned int type, unsigned int data)
  30 {
  31   int p2align = ptr_mode == SImode ? 2 : 3;
  32
  33   switch_to_section (get_section (".note.gnu.property",
  34                                   SECTION_NOTYPE, NULL));
  35
  36   ASM_OUTPUT_ALIGN (asm_out_file, p2align);
  37   /* name length.  */
  38   fprintf (asm_out_file, ASM_LONG "1f - 0f\n");
  39   /* data length.  */
  40   fprintf (asm_out_file, ASM_LONG "4f - 1f\n");
  41   /* note type: NT_GNU_PROPERTY_TYPE_0.  */
  42   fprintf (asm_out_file, ASM_LONG "5\n");
  43   fprintf (asm_out_file, "0:\n");
  44   /* vendor name: "GNU".  */
  45   fprintf (asm_out_file, STRING_ASM_OP "\"GNU\"\n");
  46   fprintf (asm_out_file, "1:\n");
  47   ASM_OUTPUT_ALIGN (asm_out_file, p2align);
  48   /* pr_type.  */
  49   fprintf (asm_out_file, ASM_LONG "0x%x\n", type);
  50   /* pr_datasz.  */
  51   fprintf (asm_out_file, ASM_LONG "3f - 2f\n");
  52   fprintf (asm_out_file, "2:\n");
  53   fprintf (asm_out_file, ASM_LONG "0x%x\n", data);
  54   fprintf (asm_out_file, "3:\n");
  55   ASM_OUTPUT_ALIGN (asm_out_file, p2align);
  56   fprintf (asm_out_file, "4:\n");
  57 }
  58
  59 void
  60 file_end_indicate_exec_stack_and_gnu_property (void)
  61 {
  62   file_end_indicate_exec_stack ();
  63
  64   if (flag_cf_protection == CF_NONE
  65       && !ix86_needed
  66       && !ix86_has_no_direct_extern_access)
  67     return;
  68
  69   unsigned int feature_1 = 0;
  70
  71   if (flag_cf_protection & CF_BRANCH)
  72     /* GNU_PROPERTY_X86_FEATURE_1_IBT.  */
  73     feature_1 |= 0x1;
  74
  75   if (flag_cf_protection & CF_RETURN)
  76     /* GNU_PROPERTY_X86_FEATURE_1_SHSTK.  */
  77     feature_1 |= 0x2;
  78
  79   /* Generate GNU_PROPERTY_X86_FEATURE_1_AND.  */
  80   if (feature_1)
  81     emit_gnu_property (0xc0000002, feature_1);
  82
  83   unsigned int isa_1 = 0;
  84   if (ix86_needed)
  85     {
  86       /* GNU_PROPERTY_X86_ISA_1_BASELINE.  */
  87       if (TARGET_64BIT
  88           || TARGET_FXSR
  89           || TARGET_80387
  90           || TARGET_MMX
  91           || TARGET_SSE
  92           || TARGET_SSE2)
  93         isa_1 |= 1 << 0;
  94
  95       /* GNU_PROPERTY_X86_ISA_1_V2.  */
  96       if (TARGET_CMPXCHG16B
  97           || (TARGET_64BIT && TARGET_SAHF)
  98           || TARGET_POPCNT
  99           || TARGET_SSE3
 100           || TARGET_SSSE3
 101           || TARGET_SSE4_1
 102           || TARGET_SSE4_2)
 103         isa_1 |= 1 << 1;
 104
 105       /* GNU_PROPERTY_X86_ISA_1_V3.  */
 106       if (TARGET_AVX
 107           || TARGET_AVX2
 108           || TARGET_F16C
 109           || TARGET_FMA
 110           || TARGET_LZCNT
 111           || TARGET_MOVBE
 112           || TARGET_XSAVE)
 113         isa_1 |= 1 << 2;
 114
 115       /* GNU_PROPERTY_X86_ISA_1_V4.  */
 116       if (TARGET_AVX512F
 117           || TARGET_AVX512BW
 118           || TARGET_AVX512CD
 119           || TARGET_AVX512DQ
 120           || TARGET_AVX512VL)
 121         isa_1 |= 1 << 3;
 122     }
 123
 124   /* Generate GNU_PROPERTY_X86_ISA_1_NEEDED.  */
 125   if (isa_1)
 126     emit_gnu_property (0xc0008002, isa_1);
 127
 128   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     emit_gnu_property (0xb0008000, (1U << 0));
 132 }