arm64: entry: convert IRQ+FIQ handlers to C

For various reasons we'd like to convert the bulk of arm64's exception
triage logic to C. As a step towards that, this patch converts the EL1
and EL0 IRQ+FIQ triage logic to C.

Separate C functions are added for the native and compat cases so that
in subsequent patches we can handle native/compat differences in C.

Since the triage functions can now call arm64_apply_bp_hardening()
directly, the do_el0_irq_bp_hardening() wrapper function is removed.

Since the user_exit_irqoff macro is now unused, it is removed. The
user_enter_irqoff macro is still used by the ret_to_user code, and
cannot be removed at this time.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Joey Gouly <joey.gouly@arm.com>
Cc: James Morse <james.morse@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20210607094624.34689-8-mark.rutland@arm.com
Signed-off-by: Will Deacon <will@kernel.org>

This commit is contained in:

Mark Rutland

2021-06-07 10:46:11 +01:00

committed by

Will Deacon

parent f8049488e7

commit 064dbfb416

5 changed files with 110 additions and 108 deletions

									
										arch/arm64/include/asm/processor.h
									
		-2
	
												View File
												
				@@ -257,8 +257,6 @@ void set_task_sctlr_el1(u64 sctlr);

				extern struct task_struct *cpu_switch_to(struct task_struct *prev,

									 struct task_struct *next);

				asmlinkage void arm64_preempt_schedule_irq(void);

				#define task_pt_regs(p) \

					((struct pt_regs *)(THREAD_SIZE + task_stack_page(p)) - 1)