/* SPDX-License-Identifier: GPL-2.0-only *//* * Copyright (c) 2021 Keith Packard <keithp@keithp.com> * Copyright (c) 2021 Google, LLC <ardb@kernel.org> */ #ifndef _ASM_ARM_CURRENT_H#define _ASM_ARM_CURRENT_H #ifndef __ASSEMBLY__#include <asm/insn.h> struct task_struct; extern struct task_struct *__current; static __always_inline __attribute_const__ struct task_struct *get_current(void){	struct task_struct *cur; #if __has_builtin(__builtin_thread_pointer) && defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO)	/*	 * Use the __builtin helper when available - this results in better	 * code, especially when using GCC in combination with the per-task	 * stack protector, as the compiler will recognize that it needs to	 * load the TLS register only once in every function.	 */	cur = __builtin_thread_pointer();#elif defined(CONFIG_CURRENT_POINTER_IN_TPIDRURO) || defined(CONFIG_SMP)	asm("0:	mrc p15, 0, %0, c13, c0, 3			\n\t"#ifdef CONFIG_CPU_V6	    "1:							\n\t"	    "	.subsection 1					\n\t"#if defined(CONFIG_ARM_HAS_GROUP_RELOCS) && \    !(defined(MODULE) && defined(CONFIG_ARM_MODULE_PLTS))	    "2: " LOAD_SYM_ARMV6(%0, __current) "		\n\t"	    "	b	1b					\n\t"#else	    "2:	ldr	%0, 3f					\n\t"	    "	ldr	%0, [%0]				\n\t"	    "	b	1b					\n\t"	    "3:	.long	__current				\n\t"#endif	    "	.previous					\n\t"	    "	.pushsection \".alt.smp.init\", \"a\"		\n\t"	    "	.long	0b - .					\n\t"	    "	b	. + (2b - 0b)				\n\t"	    "	.popsection					\n\t"#endif	    : "=r"(cur));#elif __LINUX_ARM_ARCH__>= 7 || \      !defined(CONFIG_ARM_HAS_GROUP_RELOCS) || \      (defined(MODULE) && defined(CONFIG_ARM_MODULE_PLTS))	cur = __current;#else	asm(LOAD_SYM_ARMV6(%0, __current) : "=r"(cur));#endif	return cur;} #define current get_current() #endif /* __ASSEMBLY__ */ #endif /* _ASM_ARM_CURRENT_H */