Re: [PATCH v3 3/5] arm: fiq: Replace default FIQ handler

[Nicolas Pitre]

On Mon, 8 Sep 2014, Daniel Thompson wrote:

> +@
> +@ Taking a FIQ in abort mode is similar to taking a FIQ in SVC mode
> +@ and reuses the same macros. However in abort mode we must also
> +@ save/restore lr_abt and spsr_abt to make nested aborts safe.
> +@
> +	.align 5
> +__fiq_abt:
> +	svc_entry 0, 0
> +
> + ARM(	msr	cpsr_c, #ABT_MODE | PSR_I_BIT | PSR_F_BIT )
> + THUMB( mov	r0, #ABT_MODE | PSR_I_BIT | PSR_F_BIT )
> + THUMB( msr	cpsr_c, r0 )
> +	mov	r1, lr		@ Save lr_abt
> +	mrs	r2, spsr	@ Save spsr_abt, abort is now safe
> + ARM(	msr	cpsr_c, #SVC_MODE | PSR_I_BIT | PSR_F_BIT )
> + THUMB( mov	r0, #SVC_MODE | PSR_I_BIT | PSR_F_BIT )
> + THUMB( msr	cpsr_c, r0 )
> +	push	{r1 - r2}

	stmfd sp!, {r1 - r2}

> +
> +	sub	r0, sp, #8			@ struct pt_regs *regs
> +	bl	handle_fiq_as_nmi
> +
> +	pop	{r1 - r2}

	ldmfd sp!, {r1 - r2}

... so that old binutils we still accept to compile the kernel (in ARM 
mode) are happy.

Otherwise...

Acked-by: Nicolas Pitre <nico@xxxxxxxxxx>


Nicolas
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