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/* Functions for x86 GNU property.
Copyright (C) 2017-2023 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"
#include "i386-protos.h"
static void
emit_gnu_property (unsigned int type, unsigned int data)
{
int p2align = ptr_mode == SImode ? 2 : 3;
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. */
fprintf (asm_out_file, ASM_LONG "0x%x\n", type);
/* pr_datasz. */
fprintf (asm_out_file, ASM_LONG "3f - 2f\n");
fprintf (asm_out_file, "2:\n");
fprintf (asm_out_file, ASM_LONG "0x%x\n", data);
fprintf (asm_out_file, "3:\n");
ASM_OUTPUT_ALIGN (asm_out_file, p2align);
fprintf (asm_out_file, "4:\n");
}
void
file_end_indicate_exec_stack_and_gnu_property (void)
{
file_end_indicate_exec_stack ();
if (flag_cf_protection == CF_NONE
&& !ix86_needed
&& !ix86_has_no_direct_extern_access)
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;
/* Generate GNU_PROPERTY_X86_FEATURE_1_AND. */
if (feature_1)
emit_gnu_property (0xc0000002, feature_1);
unsigned int isa_1 = 0;
if (ix86_needed)
{
/* GNU_PROPERTY_X86_ISA_1_BASELINE. */
if (TARGET_64BIT
|| TARGET_FXSR
|| TARGET_80387
|| TARGET_MMX
|| TARGET_SSE
|| TARGET_SSE2)
isa_1 |= 1 << 0;
/* GNU_PROPERTY_X86_ISA_1_V2. */
if (TARGET_CMPXCHG16B
|| (TARGET_64BIT && TARGET_SAHF)
|| TARGET_POPCNT
|| TARGET_SSE3
|| TARGET_SSSE3
|| TARGET_SSE4_1
|| TARGET_SSE4_2)
isa_1 |= 1 << 1;
/* GNU_PROPERTY_X86_ISA_1_V3. */
if (TARGET_AVX
|| TARGET_AVX2
|| TARGET_F16C
|| TARGET_FMA
|| TARGET_LZCNT
|| TARGET_MOVBE
|| TARGET_XSAVE)
isa_1 |= 1 << 2;
/* GNU_PROPERTY_X86_ISA_1_V4. */
if (TARGET_AVX512F
|| TARGET_AVX512BW
|| TARGET_AVX512CD
|| TARGET_AVX512DQ
|| TARGET_AVX512VL)
isa_1 |= 1 << 3;
}
/* Generate GNU_PROPERTY_X86_ISA_1_NEEDED. */
if (isa_1)
emit_gnu_property (0xc0008002, isa_1);
if (ix86_has_no_direct_extern_access)
/* Emite a GNU_PROPERTY_1_NEEDED note with
GNU_PROPERTY_1_NEEDED_INDIRECT_EXTERN_ACCESS. */
emit_gnu_property (0xb0008000, (1U << 0));
}
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