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 <redacted>


Nicolas