Excerpts from Christophe Leroy's message of February 10, 2021 2:13 am:
>
>
> Le 09/02/2021 à 02:55, Nicholas Piggin a écrit :
>> Excerpts from Christophe Leroy's message of February 9, 2021 1:10 am:
>>> When r3 is not modified, reload it from regs->orig_r3 to free
>>> volatile registers. This
Le 09/02/2021 à 02:55, Nicholas Piggin a écrit :
Excerpts from Christophe Leroy's message of February 9, 2021 1:10 am:
When r3 is not modified, reload it from regs->orig_r3 to free
volatile registers. This avoids a stack frame for the likely part
of system_call_exception()
This doesn't on
Excerpts from Christophe Leroy's message of February 9, 2021 1:10 am:
> When r3 is not modified, reload it from regs->orig_r3 to free
> volatile registers. This avoids a stack frame for the likely part
> of system_call_exception()
This doesn't on my 64s build, but it does reduce one non volatile
When r3 is not modified, reload it from regs->orig_r3 to free
volatile registers. This avoids a stack frame for the likely part
of system_call_exception()
Before the patch:
c000b4d4 :
c000b4d4: 7c 08 02 a6 mflrr0
c000b4d8: 94 21 ff e0 stwur1,-32(r1)
c000b4dc: 93
