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56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
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/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2021 Keith Packard <keithp@keithp.com>
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* Copyright (c) 2021 Google, LLC <ardb@kernel.org>
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*/
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#ifndef _ASM_ARM_CURRENT_H
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#define _ASM_ARM_CURRENT_H
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#ifndef __ASSEMBLY__
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struct task_struct;
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static inline void set_current(struct task_struct *cur)
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{
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if (!IS_ENABLED(CONFIG_CURRENT_POINTER_IN_TPIDRURO))
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return;
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/* Set TPIDRURO */
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asm("mcr p15, 0, %0, c13, c0, 3" :: "r"(cur) : "memory");
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}
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#ifdef CONFIG_CURRENT_POINTER_IN_TPIDRURO
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static inline struct task_struct *get_current(void)
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{
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struct task_struct *cur;
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#if __has_builtin(__builtin_thread_pointer) && \
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!(defined(CONFIG_THUMB2_KERNEL) && \
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defined(CONFIG_CC_IS_CLANG) && CONFIG_CLANG_VERSION < 130001)
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/*
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* Use the __builtin helper when available - this results in better
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* code, especially when using GCC in combination with the per-task
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* stack protector, as the compiler will recognize that it needs to
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* load the TLS register only once in every function.
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*
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* Clang < 13.0.1 gets this wrong for Thumb2 builds:
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* https://github.com/ClangBuiltLinux/linux/issues/1485
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*/
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cur = __builtin_thread_pointer();
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#else
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asm("mrc p15, 0, %0, c13, c0, 3" : "=r"(cur));
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#endif
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return cur;
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}
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#define current get_current()
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#else
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#include <asm-generic/current.h>
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#endif /* CONFIG_CURRENT_POINTER_IN_TPIDRURO */
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_ARM_CURRENT_H */
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