f8049488e7
When handling IRQ/FIQ exceptions the entry assembly may transition from a task's stack to a CPU's IRQ stack (and IRQ shadow call stack). In subsequent patches we want to migrate the IRQ/FIQ triage logic to C, and as we want to perform some actions on the task stack (e.g. EL1 preemption), we need to switch stacks within the C handler. So that we can do so, this patch adds a helper to call a function on a CPU's IRQ stack (and shadow stack as appropriate). Subsequent patches will make use of the new helper function. Signed-off-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Catalin Marinas <catalin.marinas@arm.com> Acked-by: Marc Zyngier <maz@kernel.org> Cc: James Morse <james.morse@arm.com> Cc: Will Deacon <will@kernel.org> Link: https://lore.kernel.org/r/20210607094624.34689-7-mark.rutland@arm.com Signed-off-by: Will Deacon <will@kernel.org>
66 lines
2.4 KiB
C
66 lines
2.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Based on arch/arm/include/asm/exception.h
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*
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* Copyright (C) 2012 ARM Ltd.
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*/
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#ifndef __ASM_EXCEPTION_H
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#define __ASM_EXCEPTION_H
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#include <asm/esr.h>
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#include <asm/kprobes.h>
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#include <asm/ptrace.h>
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#include <linux/interrupt.h>
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#ifdef CONFIG_FUNCTION_GRAPH_TRACER
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#define __exception_irq_entry __irq_entry
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#else
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#define __exception_irq_entry __kprobes
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#endif
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static inline u32 disr_to_esr(u64 disr)
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{
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unsigned int esr = ESR_ELx_EC_SERROR << ESR_ELx_EC_SHIFT;
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if ((disr & DISR_EL1_IDS) == 0)
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esr |= (disr & DISR_EL1_ESR_MASK);
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else
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esr |= (disr & ESR_ELx_ISS_MASK);
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return esr;
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}
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asmlinkage void el1_sync_handler(struct pt_regs *regs);
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asmlinkage void el1_error_handler(struct pt_regs *regs);
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asmlinkage void el0_sync_handler(struct pt_regs *regs);
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asmlinkage void el0_error_handler(struct pt_regs *regs);
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asmlinkage void el0_sync_compat_handler(struct pt_regs *regs);
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asmlinkage void el0_error_compat_handler(struct pt_regs *regs);
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asmlinkage void noinstr enter_el1_irq_or_nmi(struct pt_regs *regs);
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asmlinkage void noinstr exit_el1_irq_or_nmi(struct pt_regs *regs);
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asmlinkage void call_on_irq_stack(struct pt_regs *regs,
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void (*func)(struct pt_regs *));
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asmlinkage void enter_from_user_mode(void);
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asmlinkage void exit_to_user_mode(void);
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void arm64_enter_nmi(struct pt_regs *regs);
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void arm64_exit_nmi(struct pt_regs *regs);
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void do_mem_abort(unsigned long far, unsigned int esr, struct pt_regs *regs);
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void do_undefinstr(struct pt_regs *regs);
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void do_bti(struct pt_regs *regs);
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asmlinkage void bad_mode(struct pt_regs *regs, int reason, unsigned int esr);
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void do_debug_exception(unsigned long addr_if_watchpoint, unsigned int esr,
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struct pt_regs *regs);
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void do_fpsimd_acc(unsigned int esr, struct pt_regs *regs);
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void do_sve_acc(unsigned int esr, struct pt_regs *regs);
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void do_fpsimd_exc(unsigned int esr, struct pt_regs *regs);
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void do_sysinstr(unsigned int esr, struct pt_regs *regs);
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void do_sp_pc_abort(unsigned long addr, unsigned int esr, struct pt_regs *regs);
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void bad_el0_sync(struct pt_regs *regs, int reason, unsigned int esr);
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void do_cp15instr(unsigned int esr, struct pt_regs *regs);
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void do_el0_svc(struct pt_regs *regs);
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void do_el0_svc_compat(struct pt_regs *regs);
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void do_ptrauth_fault(struct pt_regs *regs, unsigned int esr);
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void do_serror(struct pt_regs *regs, unsigned int esr);
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#endif /* __ASM_EXCEPTION_H */
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