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/* 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 */