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Diffstat (limited to '')
| -rw-r--r-- | media/ffvpx/libavutil/aarch64/asm.S | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/media/ffvpx/libavutil/aarch64/asm.S b/media/ffvpx/libavutil/aarch64/asm.S new file mode 100644 index 0000000000..a7782415d7 --- /dev/null +++ b/media/ffvpx/libavutil/aarch64/asm.S @@ -0,0 +1,237 @@ +/* + * 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 + +#if HAVE_AS_FUNC +# define FUNC +#else +# define FUNC # +#endif + +#ifndef __has_feature +# define __has_feature(x) 0 +#endif + + +/* 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 BTI +# define AARCH64_VALID_CALL_TARGET hint #34 // BTI 'c' +# define AARCH64_VALID_JUMP_TARGET hint #38 // BTI 'j' +#else +# define GNU_PROPERTY_AARCH64_BTI 0 // No BTI +# 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) +# error Authentication of leaf functions is enabled but not supported in FFmpeg! +# endif +# define GNU_PROPERTY_AARCH64_PAC (1 << 1) +#else +# define GNU_PROPERTY_AARCH64_PAC 0 +# define AARCH64_SIGN_LINK_REGISTER +# define AARCH64_VALIDATE_LINK_REGISTER +#endif + + +#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 + +.macro function name, export=0, align=2 + .macro endfunc +ELF .size \name, . - \name +FUNC .endfunc + .purgem endfunc + .endm + .text + .align \align + .if \export + .global EXTERN_ASM\name +ELF .type EXTERN_ASM\name, %function +FUNC .func EXTERN_ASM\name +EXTERN_ASM\name: + AARCH64_VALID_CALL_TARGET + .else +ELF .type \name, %function +FUNC .func \name +\name: + .endif +.endm + +.macro const name, align=2, relocate=0 + .macro endconst +ELF .size \name, . - \name + .purgem endconst + .endm +#if HAVE_SECTION_DATA_REL_RO +.if \relocate + .section .data.rel.ro +.else + .section .rodata +.endif +#elif defined(_WIN32) + .section .rdata +#elif !defined(__MACH__) + .section .rodata +#else + .const_data +#endif + .align \align +\name: +.endm + +.macro movrel rd, val, offset=0 +#if CONFIG_PIC && defined(__APPLE__) + .if \offset < 0 + adrp \rd, \val@PAGE + add \rd, \rd, \val@PAGEOFF + sub \rd, \rd, -(\offset) + .else + adrp \rd, \val+(\offset)@PAGE + add \rd, \rd, \val+(\offset)@PAGEOFF + .endif +#elif CONFIG_PIC && defined(_WIN32) + .if \offset < 0 + adrp \rd, \val + add \rd, \rd, :lo12:\val + sub \rd, \rd, -(\offset) + .else + adrp \rd, \val+(\offset) + add \rd, \rd, :lo12:\val+(\offset) + .endif +#elif CONFIG_PIC +# if __has_feature(hwaddress_sanitizer) + adrp \rd, :pg_hi21_nc:\val+(\offset) +# else + adrp \rd, \val+(\offset) +# endif + add \rd, \rd, :lo12:\val+(\offset) +#else + ldr \rd, =\val+\offset +#endif +.endm + +#define GLUE(a, b) a ## b +#define JOIN(a, b) GLUE(a, b) +#define X(s) JOIN(EXTERN_ASM, s) + +#define x18 do_not_use_x18 +#define w18 do_not_use_w18 |