From: "Maciej W. Rozycki" <macro@wdc.com>
To: Jim Wilson <jimw@sifive.com>
Cc: "gdb-patches@sourceware.org" <gdb-patches@sourceware.org>,
Andrew Burgess <andrew.burgess@embecosm.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Tom Tromey <tom@tromey.com>,
"guoren@kernel.org" <guoren@kernel.org>,
"lifang_xia@c-sky.com" <lifang_xia@c-sky.com>,
"yunhai_shang@c-sky.com" <yunhai_shang@c-sky.com>,
"jiangshuai_li@c-sky.com" <jiangshuai_li@c-sky.com>
Subject: Re: [PATCH v2 1/3] RISC-V/Linux/native: Determine FLEN dynamically
Date: Fri, 31 Jan 2020 12:11:00 -0000 [thread overview]
Message-ID: <alpine.LFD.2.21.2001311037470.14118@redsun52.ssa.fujisawa.hgst.com> (raw)
In-Reply-To: <CAFyWVaamCunsoOxs_NZWbi75TJZiuuboTcV8siLXUiiOxWJOqA@mail.gmail.com>
On Thu, 30 Jan 2020, Jim Wilson wrote:
> > We can do better however and not rely on any particular value of FLEN
> > and probe for it dynamically, by observing that the PTRACE_GETREGSET
> > ptrace(2) call will only accept an exact regset size, and that will
> > reflect FLEN.
>
> I forgot to mention this before, but our long term plans are to pass
> info via the auxiliary vector from the kernel to the application, and
> then in theory gdb should be able to get architecture info from there.
Thanks for the heads-up. This will undoubtedly be useful for something,
but I think we have a solution for GDB/gdbserver already, so unless the
circumstances change, I think we're fine without the need to peek at the
auxv.
I'll be posting v3, which has just passed testing, right away. It
includes a few further improvements beyond what has been already
discussed.
Maciej
next prev parent reply other threads:[~2020-01-31 10:43 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <alpine.LFD.2.21.2001291207310.14118@redsun52.ssa.fujisawa.hgst.com>
2020-01-29 18:13 ` Maciej W. Rozycki
2020-01-29 23:26 ` Jim Wilson
2020-01-30 0:13 ` Maciej W. Rozycki
2020-01-30 23:19 ` Jim Wilson
2020-01-31 0:06 ` Andreas Schwab
2020-01-31 12:11 ` Maciej W. Rozycki [this message]
2020-01-29 18:14 ` [PATCH v2 2/3] RISC-V/Linux/native: Factor out target description determination Maciej W. Rozycki
2020-01-29 23:39 ` Jim Wilson
[not found] ` <alpine.LFD.2.21.2001291412560.14118@redsun52.ssa.fujisawa.hgst.com>
2020-01-30 0:00 ` [PATCH v2 3/3] gdbserver: Add RISC-V/Linux support Jim Wilson
2020-01-30 1:58 ` Maciej W. Rozycki
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