mirror of https://git.ffmpeg.org/ffmpeg.git
148 lines
3.9 KiB
ArmAsm
148 lines
3.9 KiB
ArmAsm
/*
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* Copyright (c) 2008 Mans Rullgard <mans@mansr.com>
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#ifdef __ELF__
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# define ELF
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#else
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# define ELF #
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#endif
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#if HAVE_AS_FUNC
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# define FUNC
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#else
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# define FUNC #
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#endif
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#ifndef __has_feature
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# define __has_feature(x) 0
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#endif
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/* Support macros for the Armv8.5-A Branch Target Identification feature which
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* requires emitting a .note.gnu.property section with the appropriate
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* architecture-dependent feature bits set.
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* Read more: "ELF for the Arm® 64-bit Architecture"
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*/
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#if defined(__ARM_FEATURE_BTI_DEFAULT) && (__ARM_FEATURE_BTI_DEFAULT == 1)
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# define GNU_PROPERTY_AARCH64_BTI (1 << 0) // Has BTI
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# define AARCH64_VALID_CALL_TARGET hint #34 // BTI 'c'
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# define AARCH64_VALID_JUMP_TARGET hint #38 // BTI 'j'
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#else
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# define GNU_PROPERTY_AARCH64_BTI 0 // No BTI
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# define AARCH64_VALID_CALL_TARGET
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# define AARCH64_VALID_JUMP_TARGET
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#endif
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#if (GNU_PROPERTY_AARCH64_BTI != 0)
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.pushsection .note.gnu.property, "a"
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.balign 8
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.long 4
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.long 0x10
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.long 0x5
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.asciz "GNU"
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.long 0xc0000000 /* GNU_PROPERTY_AARCH64_FEATURE_1_AND */
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.long 4
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.long GNU_PROPERTY_AARCH64_BTI
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.long 0
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.popsection
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#endif
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.macro function name, export=0, align=2
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.macro endfunc
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ELF .size \name, . - \name
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FUNC .endfunc
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.purgem endfunc
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.endm
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.text
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.align \align
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.if \export
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.global EXTERN_ASM\name
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ELF .type EXTERN_ASM\name, %function
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FUNC .func EXTERN_ASM\name
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EXTERN_ASM\name:
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AARCH64_VALID_CALL_TARGET
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.else
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ELF .type \name, %function
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FUNC .func \name
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\name:
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.endif
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.endm
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.macro const name, align=2, relocate=0
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.macro endconst
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ELF .size \name, . - \name
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.purgem endconst
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.endm
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#if HAVE_SECTION_DATA_REL_RO
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.if \relocate
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.section .data.rel.ro
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.else
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.section .rodata
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.endif
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#elif defined(_WIN32)
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.section .rdata
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#elif !defined(__MACH__)
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.section .rodata
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#else
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.const_data
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#endif
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.align \align
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\name:
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.endm
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.macro movrel rd, val, offset=0
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#if CONFIG_PIC && defined(__APPLE__)
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.if \offset < 0
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adrp \rd, \val@PAGE
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add \rd, \rd, \val@PAGEOFF
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sub \rd, \rd, -(\offset)
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.else
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adrp \rd, \val+(\offset)@PAGE
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add \rd, \rd, \val+(\offset)@PAGEOFF
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.endif
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#elif CONFIG_PIC && defined(_WIN32)
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.if \offset < 0
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adrp \rd, \val
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add \rd, \rd, :lo12:\val
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sub \rd, \rd, -(\offset)
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.else
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adrp \rd, \val+(\offset)
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add \rd, \rd, :lo12:\val+(\offset)
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.endif
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#elif CONFIG_PIC
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# if __has_feature(hwaddress_sanitizer)
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adrp \rd, :pg_hi21_nc:\val+(\offset)
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# else
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adrp \rd, \val+(\offset)
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# endif
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add \rd, \rd, :lo12:\val+(\offset)
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#else
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ldr \rd, =\val+\offset
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#endif
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.endm
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#define GLUE(a, b) a ## b
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#define JOIN(a, b) GLUE(a, b)
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#define X(s) JOIN(EXTERN_ASM, s)
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#define x18 do_not_use_x18
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#define w18 do_not_use_w18
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