diff options
| author |   Mark Rutland <mark.rutland@arm.com> | 2021-06-07 10:46:10 +0100 |
|---|---|---|
| committer |   Will Deacon <will@kernel.org> | 2021-06-07 11:35:55 +0100 |
| commit | f8049488e7d37b0a0e438ee449e83b3e46958743 (patch) | |
| tree | 915089b64f3ea1a50c6492b9c9da3f7783a49d8a /arch/arm64/include/asm/exception.h | |
| parent | arm64: entry: move NMI preempt logic to C (diff) | |
| download | wireguard-linux-f8049488e7d37b0a0e438ee449e83b3e46958743.tar.xz wireguard-linux-f8049488e7d37b0a0e438ee449e83b3e46958743.zip | |
arm64: entry: add a call_on_irq_stack helper
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>
Diffstat (limited to 'arch/arm64/include/asm/exception.h')
| -rw-r--r-- | arch/arm64/include/asm/exception.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/include/asm/exception.h b/arch/arm64/include/asm/exception.h index 3a859d4e8b59..c24b69c0c589 100644 --- a/arch/arm64/include/asm/exception.h +++ b/arch/arm64/include/asm/exception.h @@ -40,6 +40,8 @@ asmlinkage void el0_error_compat_handler(struct pt_regs *regs); asmlinkage void noinstr enter_el1_irq_or_nmi(struct pt_regs *regs); asmlinkage void noinstr exit_el1_irq_or_nmi(struct pt_regs *regs); +asmlinkage void call_on_irq_stack(struct pt_regs *regs, + void (*func)(struct pt_regs *)); asmlinkage void enter_from_user_mode(void); asmlinkage void exit_to_user_mode(void); void arm64_enter_nmi(struct pt_regs *regs); |