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+/*
+ * 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_AARCH64
+#define x18 do_not_use_x18
+#define w18 do_not_use_w18
+
+/* Support macros for
+ * - Armv8.3-A Pointer Authentication and
+ * - Armv8.5-A Branch Target Identification
+ * features which require emitting a .note.gnu.property section with the
+ * appropriate architecture-dependent feature bits set.
+ *
+ * |AARCH64_SIGN_LINK_REGISTER| and |AARCH64_VALIDATE_LINK_REGISTER| expand to
+ * PACIxSP and AUTIxSP, respectively. |AARCH64_SIGN_LINK_REGISTER| should be
+ * used immediately before saving the LR register (x30) to the stack.
+ * |AARCH64_VALIDATE_LINK_REGISTER| should be used immediately after restoring
+ * it. Note |AARCH64_SIGN_LINK_REGISTER|'s modifications to LR must be undone
+ * with |AARCH64_VALIDATE_LINK_REGISTER| before RET. The SP register must also
+ * have the same value at the two points. For example:
+ *
+ * .global f
+ * f:
+ * AARCH64_SIGN_LINK_REGISTER
+ * stp x29, x30, [sp, #-96]!
+ * mov x29, sp
+ * ...
+ * ldp x29, x30, [sp], #96
+ * AARCH64_VALIDATE_LINK_REGISTER
+ * ret
+ *
+ * |AARCH64_VALID_CALL_TARGET| expands to BTI 'c'. Either it, or
+ * |AARCH64_SIGN_LINK_REGISTER|, must be used at every point that may be an
+ * indirect call target. In particular, all symbols exported from a file must
+ * begin with one of these macros. For example, a leaf function that does not
+ * save LR can instead use |AARCH64_VALID_CALL_TARGET|:
+ *
+ * .globl return_zero
+ * return_zero:
+ * AARCH64_VALID_CALL_TARGET
+ * mov x0, #0
+ * ret
+ *
+ * A non-leaf function which does not immediately save LR may need both macros
+ * because |AARCH64_SIGN_LINK_REGISTER| appears late. For example, the function
+ * may jump to an alternate implementation before setting up the stack:
+ *
+ * .globl with_early_jump
+ * with_early_jump:
+ * AARCH64_VALID_CALL_TARGET
+ * cmp x0, #128
+ * b.lt .Lwith_early_jump_128
+ * AARCH64_SIGN_LINK_REGISTER
+ * stp x29, x30, [sp, #-96]!
+ * mov x29, sp
+ * ...
+ * ldp x29, x30, [sp], #96
+ * AARCH64_VALIDATE_LINK_REGISTER
+ * ret
+ *
+ * .Lwith_early_jump_128:
+ * ...
+ * ret
+ *
+ * These annotations are only required with indirect calls. Private symbols that
+ * are only the target of direct calls do not require annotations. Also note
+ * that |AARCH64_VALID_CALL_TARGET| is only valid for indirect calls (BLR), not
+ * indirect jumps (BR). Indirect jumps in assembly are supported through
+ * |AARCH64_VALID_JUMP_TARGET|. Landing Pads which shall serve for jumps and
+ * calls can be created using |AARCH64_VALID_JUMP_CALL_TARGET|.
+ *
+ * Although not necessary, it is safe to use these macros in 32-bit ARM
+ * assembly. This may be used to simplify dual 32-bit and 64-bit files.
+ *
+ * References:
+ * - "ELF for the Arm® 64-bit Architecture"
+ * https: *github.com/ARM-software/abi-aa/blob/master/aaelf64/aaelf64.rst
+ * - "Providing protection for complex software"
+ * https://developer.arm.com/architectures/learn-the-architecture/providing-protection-for-complex-software
+ */
+#if defined(__ARM_FEATURE_BTI_DEFAULT) && (__ARM_FEATURE_BTI_DEFAULT == 1)
+#define GNU_PROPERTY_AARCH64_BTI (1 << 0) // Has Branch Target Identification
+#define AARCH64_VALID_JUMP_CALL_TARGET hint #38 // BTI 'jc'
+#define AARCH64_VALID_CALL_TARGET hint #34 // BTI 'c'
+#define AARCH64_VALID_JUMP_TARGET hint #36 // BTI 'j'
+#else
+#define GNU_PROPERTY_AARCH64_BTI 0 // No Branch Target Identification
+#define AARCH64_VALID_JUMP_CALL_TARGET
+#define AARCH64_VALID_CALL_TARGET
+#define AARCH64_VALID_JUMP_TARGET
+#endif
+
+#if defined(__ARM_FEATURE_PAC_DEFAULT)
+
+#if ((__ARM_FEATURE_PAC_DEFAULT & (1 << 0)) != 0) // authentication using key A
+#define AARCH64_SIGN_LINK_REGISTER paciasp
+#define AARCH64_VALIDATE_LINK_REGISTER autiasp
+#elif ((__ARM_FEATURE_PAC_DEFAULT & (1 << 1)) != 0) // authentication using key B
+#define AARCH64_SIGN_LINK_REGISTER pacibsp
+#define AARCH64_VALIDATE_LINK_REGISTER autibsp
+#else
+#error Pointer authentication defines no valid key!
+#endif
+#if ((__ARM_FEATURE_PAC_DEFAULT & (1 << 2)) != 0) // authentication of leaf functions
+#error Authentication of leaf functions is enabled but not supported in dav1d!
+#endif
+#define GNU_PROPERTY_AARCH64_PAC (1 << 1)
+
+#elif defined(__APPLE__) && defined(__arm64e__)
+
+#define GNU_PROPERTY_AARCH64_PAC 0
+#define AARCH64_SIGN_LINK_REGISTER pacibsp
+#define AARCH64_VALIDATE_LINK_REGISTER autibsp
+
+#else /* __ARM_FEATURE_PAC_DEFAULT */
+
+#define GNU_PROPERTY_AARCH64_PAC 0
+#define AARCH64_SIGN_LINK_REGISTER
+#define AARCH64_VALIDATE_LINK_REGISTER
+
+#endif /* !__ARM_FEATURE_PAC_DEFAULT */
+
+
+#if (GNU_PROPERTY_AARCH64_BTI != 0 || GNU_PROPERTY_AARCH64_PAC != 0) && defined(__ELF__)
+ .pushsection .note.gnu.property, "a"
+ .balign 8
+ .long 4
+ .long 0x10
+ .long 0x5
+ .asciz "GNU"
+ .long 0xc0000000 /* GNU_PROPERTY_AARCH64_FEATURE_1_AND */
+ .long 4
+ .long (GNU_PROPERTY_AARCH64_BTI | GNU_PROPERTY_AARCH64_PAC)
+ .long 0
+ .popsection
+#endif /* (GNU_PROPERTY_AARCH64_BTI != 0 || GNU_PROPERTY_AARCH64_PAC != 0) && defined(__ELF__) */
+#endif /* ARCH_AARCH64 */
+
+#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 /* __ELF__ */
+
+#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 /* CONFIG_THUMB */
+#endif /* ARCH_ARM */
+
+#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:
+#if ARCH_AARCH64
+ .if \export
+ AARCH64_VALID_CALL_TARGET
+ .endif
+#endif
+.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)
+
+
+#endif /* DAV1D_SRC_ARM_ASM_S */
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