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ARM: v7m: enable support for IRQ stacks

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Enable support for IRQ stacks on !MMU, and add the code to the IRQ entry
path to switch to the IRQ stack if not running from it already.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Tested-by: Marc Zyngier <maz@kernel.org>
Tested-by: Vladimir Murzin <vladimir.murzin@arm.com> # ARMv7M
This commit is contained in:
Ard Biesheuvel 2021-12-02 09:36:59 +01:00
parent 9c46929e79
commit cafc0eab16
2 changed files with 15 additions and 3 deletions
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1
arch/arm/Kconfig
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@ -1158,7 +1158,6 @@ config CURRENT_POINTER_IN_TPIDRURO
config IRQSTACKS
def_bool y
depends on MMU
select HAVE_IRQ_EXIT_ON_IRQ_STACK
select HAVE_SOFTIRQ_ON_OWN_STACK

17
arch/arm/kernel/entry-v7m.S
View File

@ -40,11 +40,24 @@ __irq_entry:
@ Invoke the IRQ handler
@
mov r0, sp
stmdb sp!, {lr}
ldr_this_cpu sp, irq_stack_ptr, r1, r2
@
@ If we took the interrupt while running in the kernel, we may already
@ be using the IRQ stack, so revert to the original value in that case.
@
subs r2, sp, r0 @ SP above bottom of IRQ stack?
rsbscs r2, r2, #THREAD_SIZE @ ... and below the top?
movcs sp, r0
push {r0, lr} @ preserve LR and original SP
@ routine called with r0 = struct pt_regs *
bl generic_handle_arch_irq
pop {lr}
pop {r0, lr}
mov sp, r0
@
@ Check for any pending work if returning to user
@