linux-kernel - Re: [PATCH v2 4/4] riscv: entry: consolidate general regs saving into save

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Message-ID: <YzXBZnGXQdEGR1LW@xhacker>
Date:   Fri, 30 Sep 2022 00:01:42 +0800
From:   Jisheng Zhang <jszhang@...nel.org>
To:     Guo Ren <guoren@...nel.org>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        llvm@...ts.linux.dev
Subject: Re: [PATCH v2 4/4] riscv: entry: consolidate general regs saving
 into save_gp

On Thu, Sep 29, 2022 at 11:59:00AM +0800, Guo Ren wrote:
> On Thu, Sep 29, 2022 at 12:29 AM Jisheng Zhang <jszhang@...nel.org> wrote:
> >
> > Consolidate the saving/restoring GPs(except ra, sp and tp) into
> > save_gp/restore_gp macro.
> >
> > No functional change intended.
> >
> > Signed-off-by: Jisheng Zhang <jszhang@...nel.org>
> > ---
> >  arch/riscv/include/asm/asm.h   | 65 +++++++++++++++++++++++++
> >  arch/riscv/kernel/entry.S      | 87 ++--------------------------------
> >  arch/riscv/kernel/mcount-dyn.S | 58 +----------------------
> >  3 files changed, 70 insertions(+), 140 deletions(-)
> >
> > diff --git a/arch/riscv/include/asm/asm.h b/arch/riscv/include/asm/asm.h
> > index 1b471ff73178..2f3b49536e9d 100644
> > --- a/arch/riscv/include/asm/asm.h
> > +++ b/arch/riscv/include/asm/asm.h
> > @@ -68,6 +68,7 @@
> >  #endif
> >
> >  #ifdef __ASSEMBLY__
> > +#include <asm/asm-offsets.h>
> >
> >  /* Common assembly source macros */
> >
> > @@ -80,6 +81,70 @@
> >         .endr
> >  .endm
> >
> > +       /* save all GPs except ra, sp and tp */
> > +       .macro save_gp
> How about leave x3(gp) out of the macro, and define:
> .marco save_from_x5_to_x31
> .marco restore_from_x5_to_x31

Good idea, will do in next version.

Thanks