/*
* Copyright (c) 2018 Janne Grunau <janne-libav@jannau.net>
* Copyright (c) 2019 Rémi Denis-Courmont
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This program 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef __APPLE__
# define EXTERN_ASM _
#else
# define EXTERN_ASM
#endif
#if defined(__APPLE__) || defined(_WIN32)
# define HAVE_AS_ARCH_DIRECTIVE 0
# define HAVE_AS_FPU_DIRECTIVE 0
#else
# define HAVE_AS_ARCH_DIRECTIVE 1
# define HAVE_AS_FPU_DIRECTIVE 1
#endif
.macro function name
.globl EXTERN_ASM\name
#ifdef __ELF__
.type EXTERN_ASM\name, %function
#endif
EXTERN_ASM\name:
.endm
#ifdef __ELF__
.macro bti_advertise
/* See SysV ABI Linux extensions */
#define NT_GNU_PROPERTY_TYPE_0 5
/* See ARM IHI0056 */
#define GNU_PROPERTY_AARCH64_FEATURE_1_AND 0xc0000000
#define GNU_PROPERTY_AARCH64_FEATURE_1_BTI 0x00000001
#define GNU_PROPERTY_AARCH64_FEATURE_1_PAC 0x00000002
.pushsection .note.gnu.property, "a"
.align 3
.word 2f - 1f
.word 4f - 3f
.word NT_GNU_PROPERTY_TYPE_0
1: .asciz "GNU"
2: .align 3
3: .word GNU_PROPERTY_AARCH64_FEATURE_1_AND /* type */
.word 6f - 5f /* size */
5: .word GNU_PROPERTY_AARCH64_FEATURE_1_BTI /* value */
6: .align 3
4: .popsection
.endm
#else
.macro bti_advertise
.endm
#endif
.macro bti targets=
.ifb \targets
hint #32
.else
.ifc \targets, c
hint #34
.else
.ifc \targets, j
hint #36
.else
.ifc \targets, jc
hint #38
.else
.error "invalid BTI target"
.endif
.endif
.endif
.endif
.endm
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(vorverarbeitet am 2026-11-04)
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