On Wed, Feb 9, 2022 at 4:48 PM Sergei Shtylyov
<sergei.shtylyov@xxxxxxxxx> wrote:
> On 2/9/22 6:18 PM, Arnd Bergmann wrote:
> >>> since 2009 after 1e1030dccb10 ("sh: nmi_debug support."). On a
> >>
> >> Mhm... this commit changes the SH3 code while SH778x are SH4A, no?
> >
> > This code is shared between both:
> >
> > arch/sh/kernel/cpu/sh4/Makefile:common-y += $(addprefix
> > ../sh3/, entry.o ex.o)
>
> Ah, quite convoluted! :-)
> So you mean thet broke the delivery of EVT 0x200 when mucking with NMI?
Yes, exactly: If I read this right, the added code:
+ shlr2 r4
+ shlr r4
+ mov r4, r0 ! save vector->jmp table offset for later
+
+ shlr2 r4 ! vector to IRQ# conversion
+ add #-0x10, r4
+
+ cmp/pz r4 ! is it a valid IRQ?
+ bt 10f
gets the vector (0x200 for this device), shifts it five bits to 0x10,
and subtracts 0x10,
then branches to do_IRQ if the interrupt number is non-zero, otherwise it goes
through the exception_handling_table.
Arnd
