1 /* Functions for x86 GNU property.
2 Copyright (C) 2017-2022 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
emit_gnu_property(unsigned int type,unsigned int data)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
file_end_indicate_exec_stack_and_gnu_property(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 }
133