linux-kernel - Re: [PATCH] gdb-script: updated lx

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Date:   Sun, 13 Nov 2022 14:14:04 +0000
From:   Conor Dooley <conor@...nel.org>
To:     debug@...osinc.com
Cc:     palmer@...belt.com, jan.kiszka@...mens.com, kbingham@...nel.org,
        paul.walmsley@...ive.com, aou@...s.berkeley.edu,
        linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux@...osinc.com
Subject: Re: [PATCH] gdb-script: updated lx_current for riscv

On Sun, Nov 13, 2022 at 12:13:40AM +0000, Conor Dooley wrote:
> On Fri, Nov 11, 2022 at 11:59:38AM -0800, debug@...osinc.com wrote:
> > From: Deepak Gupta <debug@...osinc.com>
> > 
> > lx_current python gdb command defined in scripts/gdb/cpus.py updated
> > to support riscv architecture.
> 
> The commit which added support for arm64 gave an explanation of why
> SP_EL0 needed to be checked. Would be nice if you could do the same here
> for RISC-V. See 526940e39626 ("scripts/gdb: add lx_current support for
> arm64") for what I mean.
> 
> While you're at it, "scripts/gdb: add support for RISC-V" would appear

Realised I omitted a word there, sorry: s/add support/add lx_current support/

> to be a more standard $subject for this file.
> 
> Thanks,
> Conor.
> 
> > 
> > Signed-off-by: Deepak Gupta <debug@...osinc.com>
> > ---
> >  scripts/gdb/linux/cpus.py | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> > diff --git a/scripts/gdb/linux/cpus.py b/scripts/gdb/linux/cpus.py
> > index 15fc4626d236..ce6703f1e35a 100644
> > --- a/scripts/gdb/linux/cpus.py
> > +++ b/scripts/gdb/linux/cpus.py
> > @@ -173,6 +173,14 @@ def get_current_task(cpu):
> >           else:
> >               raise gdb.GdbError("Sorry, obtaining the current task is not allowed "
> >                                  "while running in userspace(EL0)")
> > +    elif utils.is_target_arch("riscv"):
> > +         current_task_addr = gdb.parse_and_eval("$tp")
> > +         if((current_task_addr.cast(utils.get_long_type()) >> 63) != 0):
> > +             current_task = current_task_addr.cast(task_ptr_type)
> > +             return current_task.dereference()
> > +         else:
> > +             raise gdb.GdbError("Sorry, obtaining the current task is not allowed "
> > +                                "while running in userspace")
> >      else:
> >          raise gdb.GdbError("Sorry, obtaining the current task is not yet "
> >                             "supported with this arch")
> > -- 
> > 2.25.1
> >