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| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
|---|---|
| 2 | |
| 3 | #ifndef _ASM_ARM64_ENTRY_COMMON_H |
| 4 | #define _ASM_ARM64_ENTRY_COMMON_H |
| 5 | |
| 6 | #include <linux/thread_info.h> |
| 7 | |
| 8 | #include <asm/cpufeature.h> |
| 9 | #include <asm/daifflags.h> |
| 10 | #include <asm/fpsimd.h> |
| 11 | #include <asm/mte.h> |
| 12 | #include <asm/stacktrace.h> |
| 13 | |
| 14 | #define ARCH_EXIT_TO_USER_MODE_WORK (_TIF_MTE_ASYNC_FAULT | _TIF_FOREIGN_FPSTATE) |
| 15 | |
| 16 | static __always_inline void arch_exit_to_user_mode_work(struct pt_regs *regs, |
| 17 | unsigned long ti_work) |
| 18 | { |
| 19 | if (ti_work & _TIF_MTE_ASYNC_FAULT) { |
| 20 | clear_thread_flag(TIF_MTE_ASYNC_FAULT); |
| 21 | send_sig_fault(SIGSEGV, SEGV_MTEAERR, (void __user *)NULL, current); |
| 22 | } |
| 23 | |
| 24 | if (ti_work & _TIF_FOREIGN_FPSTATE) |
| 25 | fpsimd_restore_current_state(); |
| 26 | } |
| 27 | |
| 28 | #define arch_exit_to_user_mode_work arch_exit_to_user_mode_work |
| 29 | |
| 30 | static inline bool arch_irqentry_exit_need_resched(void) |
| 31 | { |
| 32 | /* |
| 33 | * DAIF.DA are cleared at the start of IRQ/FIQ handling, and when GIC |
| 34 | * priority masking is used the GIC irqchip driver will clear DAIF.IF |
| 35 | * using gic_arch_enable_irqs() for normal IRQs. If anything is set in |
| 36 | * DAIF we must have handled an NMI, so skip preemption. |
| 37 | */ |
| 38 | if (system_uses_irq_prio_masking() && read_sysreg(daif)) |
| 39 | return false; |
| 40 | |
| 41 | /* |
| 42 | * Preempting a task from an IRQ means we leave copies of PSTATE |
| 43 | * on the stack. cpufeature's enable calls may modify PSTATE, but |
| 44 | * resuming one of these preempted tasks would undo those changes. |
| 45 | * |
| 46 | * Only allow a task to be preempted once cpufeatures have been |
| 47 | * enabled. |
| 48 | */ |
| 49 | if (!system_capabilities_finalized()) |
| 50 | return false; |
| 51 | |
| 52 | return true; |
| 53 | } |
| 54 | |
| 55 | #define arch_irqentry_exit_need_resched arch_irqentry_exit_need_resched |
| 56 | |
| 57 | #endif /* _ASM_ARM64_ENTRY_COMMON_H */ |
| 58 |
Warning: This file is not a C or C++ file. It does not have highlighting.