Quelle  assembler.h

/* SPDX-License-Identifier: GPL-2.0 */
/*
 * Copyright (C) 2019  Arm Limited
 * Original author: Dave Martin <Dave.Martin@arm.com>
 */

#ifndef ASSEMBLER_H
#define ASSEMBLER_H

#define NT_GNU_PROPERTY_TYPE_0 5
#define GNU_PROPERTY_AARCH64_FEATURE_1_AND 0xc0000000

/* Bits for GNU_PROPERTY_AARCH64_FEATURE_1_BTI */
#define GNU_PROPERTY_AARCH64_FEATURE_1_BTI (1U << 0)
#define GNU_PROPERTY_AARCH64_FEATURE_1_PAC (1U << 1)


.macro startfn name:req
 .globl \name
\name:
 .macro endfn
  .size \name, . - \name
  .type \name, @function
  .purgem endfn
 .endm
.endm

.macro emit_aarch64_feature_1_and
 .pushsection .note.gnu.property, "a"
 .align 3
 .long 2f - 1f
 .long 6f - 3f
 .long NT_GNU_PROPERTY_TYPE_0
1: .string "GNU"
2:
 .align 3
3: .long GNU_PROPERTY_AARCH64_FEATURE_1_AND
 .long 5f - 4f
4:
#if BTI
 .long GNU_PROPERTY_AARCH64_FEATURE_1_PAC | \
  GNU_PROPERTY_AARCH64_FEATURE_1_BTI
#else
 .long 0
#endif
5:
 .align 3
6:
 .popsection
.endm

.macro paciasp
 hint 0x19
.endm

.macro autiasp
 hint 0x1d
.endm

.macro __bti_
 hint 0x20
.endm

.macro __bti_c
 hint 0x22
.endm

.macro __bti_j
 hint 0x24
.endm

.macro __bti_jc
 hint 0x26
.endm

.macro bti what=
 __bti_\what
.endm

#endif /* ! ASSEMBLER_H */