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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_ARM64_ENTRY_COMMON_H
#define _ASM_ARM64_ENTRY_COMMON_H
#include <linux/thread_info.h>
#include <asm/cpufeature.h>
#include <asm/daifflags.h>
#include <asm/fpsimd.h>
#include <asm/mte.h>
#include <asm/stacktrace.h>
#define ARCH_EXIT_TO_USER_MODE_WORK (_TIF_MTE_ASYNC_FAULT | _TIF_FOREIGN_FPSTATE)
static __always_inline void arch_exit_to_user_mode_work(struct pt_regs *regs,
unsigned long ti_work)
{
if (ti_work & _TIF_MTE_ASYNC_FAULT) {
clear_thread_flag(TIF_MTE_ASYNC_FAULT);
send_sig_fault(SIGSEGV, SEGV_MTEAERR, (void __user *)NULL, current);
}
if (ti_work & _TIF_FOREIGN_FPSTATE)
fpsimd_restore_current_state();
}
#define arch_exit_to_user_mode_work arch_exit_to_user_mode_work
static inline bool arch_irqentry_exit_need_resched(void)
{
/*
* DAIF.DA are cleared at the start of IRQ/FIQ handling, and when GIC
* priority masking is used the GIC irqchip driver will clear DAIF.IF
* using gic_arch_enable_irqs() for normal IRQs. If anything is set in
* DAIF we must have handled an NMI, so skip preemption.
*/
if (system_uses_irq_prio_masking() && read_sysreg(daif))
return false;
/*
* Preempting a task from an IRQ means we leave copies of PSTATE
* on the stack. cpufeature's enable calls may modify PSTATE, but
* resuming one of these preempted tasks would undo those changes.
*
* Only allow a task to be preempted once cpufeatures have been
* enabled.
*/
if (!system_capabilities_finalized())
return false;
return true;
}
#define arch_irqentry_exit_need_resched arch_irqentry_exit_need_resched
#endif /* _ASM_ARM64_ENTRY_COMMON_H */
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