FFmpeg/libavcodec/arm/asm.S

/*
 * Copyright (c) 2008 Mans Rullgard <mans@mansr.com>
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg 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.
 *
 * FFmpeg 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 FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include "config.h"

#ifdef __ELF__
#   define ELF
#else
#   define ELF @
#endif

.macro  require8 val=1
ELF     .eabi_attribute 24, \val
.endm

.macro  preserve8 val=1
ELF     .eabi_attribute 25, \val
.endm

.macro  function name, export=0
    .macro endfunc
ELF     .size   \name, . - \name
        .endfunc
        .purgem endfunc
    .endm
        .text
    .if \export
        .global EXTERN_ASM\name
EXTERN_ASM\name:
    .endif
ELF     .type   \name, %function
        .func   \name
\name:
.endm

.macro  const   name, align=2
    .macro endconst
ELF     .size   \name, . - \name
        .purgem endconst
    .endm
        .section        .rodata
        .align          \align
\name:
.endm

.macro  mov32   rd, val
#if HAVE_ARMV6T2
        movw            \rd, #(\val) & 0xffff
    .if (\val) >> 16
        movt            \rd, #(\val) >> 16
    .endif
#else
        ldr             \rd, =\val
#endif
.endm

.macro  movrel rd, val
#if HAVE_ARMV6T2 && !CONFIG_PIC && !defined(__APPLE__)
        movw            \rd, #:lower16:\val
        movt            \rd, #:upper16:\val
#else
        ldr             \rd, =\val
#endif
.endm

#if HAVE_VFP_ARGS
        .eabi_attribute 28, 1
#   define VFP
#   define NOVFP @
#else
#   define VFP   @
#   define NOVFP
#endif

#define GLUE(a, b) a ## b
#define JOIN(a, b) GLUE(a, b)
#define X(s) JOIN(EXTERN_ASM, s)