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diff --git a/third_party/dav1d/src/arm/asm.S b/third_party/dav1d/src/arm/asm.S
new file mode 100644
index 0000000000..0e59c0228b
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+++ b/third_party/dav1d/src/arm/asm.S
@@ -0,0 +1,155 @@
+/*
+ * Copyright © 2018, VideoLAN and dav1d authors
+ * Copyright © 2018, Janne Grunau
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef DAV1D_SRC_ARM_ASM_S
+#define DAV1D_SRC_ARM_ASM_S
+
+#include "config.h"
+
+#if ARCH_ARM
+        .syntax unified
+#ifdef __ELF__
+        .arch armv7-a
+        .fpu neon
+        .eabi_attribute 10, 0           // suppress Tag_FP_arch
+        .eabi_attribute 12, 0           // suppress Tag_Advanced_SIMD_arch
+        .section .note.GNU-stack,"",%progbits // Mark stack as non-executable
+#endif
+
+#ifdef _WIN32
+#define CONFIG_THUMB 1
+#else
+#define CONFIG_THUMB 0
+#endif
+
+#if CONFIG_THUMB
+        .thumb
+#define A @
+#define T
+#else
+#define A
+#define T @
+#endif
+#endif
+
+#if !defined(PIC)
+#if defined(__PIC__)
+#define PIC __PIC__
+#elif defined(__pic__)
+#define PIC __pic__
+#endif
+#endif
+
+#ifndef PRIVATE_PREFIX
+#define PRIVATE_PREFIX dav1d_
+#endif
+
+#define PASTE(a,b) a ## b
+#define CONCAT(a,b) PASTE(a,b)
+
+#ifdef PREFIX
+#define EXTERN CONCAT(_,PRIVATE_PREFIX)
+#else
+#define EXTERN PRIVATE_PREFIX
+#endif
+
+.macro function name, export=0, align=2
+    .macro endfunc
+#ifdef __ELF__
+        .size   \name, . - \name
+#endif
+#if HAVE_AS_FUNC
+        .endfunc
+#endif
+        .purgem endfunc
+    .endm
+        .text
+        .align \align
+    .if \export
+        .global EXTERN\name
+#ifdef __ELF__
+        .type   EXTERN\name, %function
+        .hidden EXTERN\name
+#elif defined(__MACH__)
+        .private_extern EXTERN\name
+#endif
+#if HAVE_AS_FUNC
+        .func   EXTERN\name
+#endif
+EXTERN\name:
+    .else
+#ifdef __ELF__
+        .type \name, %function
+#endif
+#if HAVE_AS_FUNC
+        .func \name
+#endif
+    .endif
+\name:
+.endm
+
+.macro  const   name, export=0, align=2
+    .macro endconst
+#ifdef __ELF__
+        .size   \name, . - \name
+#endif
+        .purgem endconst
+    .endm
+#if defined(_WIN32)
+        .section        .rdata
+#elif !defined(__MACH__)
+        .section        .rodata
+#else
+        .const_data
+#endif
+        .align          \align
+    .if \export
+        .global EXTERN\name
+#ifdef __ELF__
+        .hidden EXTERN\name
+#elif defined(__MACH__)
+        .private_extern EXTERN\name
+#endif
+EXTERN\name:
+    .endif
+\name:
+.endm
+
+#ifdef __APPLE__
+#define L(x) L ## x
+#else
+#define L(x) .L ## x
+#endif
+
+#define X(x) CONCAT(EXTERN, x)
+
+#if ARCH_AARCH64
+#define x18 do_not_use_x18
+#define w18 do_not_use_w18
+#endif
+
+#endif /* DAV1D_SRC_ARM_ASM_S */