From: Alistair Francis <alistair23@gmail.com>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: Furquan Shaikh <furquan@rivosinc.com>,
Richard Henderson <richard.henderson@linaro.org>,
Palmer Dabbelt <palmer@dabbelt.com>,
Alistair Francis <alistair.francis@wdc.com>,
Bin Meng <bin.meng@windriver.com>,
"open list:RISC-V" <qemu-riscv@nongnu.org>,
"qemu-devel@nongnu.org Developers" <qemu-devel@nongnu.org>
Subject: Re: [PATCH] riscv: Make semihosting configurable for all privilege modes
Date: Mon, 15 Aug 2022 08:03:52 +1000 [thread overview]
Message-ID: <CAKmqyKPcr=umn4zUpxNFwBJ8MuuRkdwH5KpDgDiHHn8YMiaj4g@mail.gmail.com> (raw)
In-Reply-To: <CAFEAcA--QMVgw0ZH6S3=jHsazM-AJQX45Hm+aJ+EhDhDrzNubA@mail.gmail.com>
On Sat, Aug 13, 2022 at 8:20 PM Peter Maydell <peter.maydell@linaro.org> wrote:
>
> On Sat, 13 Aug 2022 at 01:53, Furquan Shaikh <furquan@rivosinc.com> wrote:
> > I ran into a problem when I was testing a project (with a microkernel
> > in M-mode and tasks in U-mode) that uses semihosting for debugging.
> > The semihosting worked fine for M-mode but not in U-mode. As I started
> > digging into this, I realized that this is because qemu restricts
> > semihosting to only M and S modes.
>
> Right. We should fix this by having a generic works-for-all-architectures
> semihosting config knob, because this is not a riscv specific problem,
> and we already have issues with different target architectures
> developing their own solutions to things.
I agree with Peter here. I don't see a strong use case for a RISC-V
specific fine grained control. A user can either enable/disable
semihosting for privilege or usermodes (with Peter's patchset). That
seems like enough configuration options, it is unlikely that someone
will need semihosting only available to S-mode for example.
Alistair
>
> I'll see if I can dig out the half-done patchset I had for this.
>
> thanks
> -- PMM
>
next prev parent reply other threads:[~2022-08-14 22:05 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-11 20:41 [PATCH] riscv: Make semihosting configurable for all privilege modes Furquan Shaikh
2022-08-11 20:56 ` Furquan Shaikh
2022-08-11 23:27 ` Philippe Mathieu-Daudé via
2022-08-12 11:04 ` Andrew Jones
2022-08-12 22:05 ` Furquan Shaikh
2022-08-12 23:00 ` Palmer Dabbelt
2022-08-12 23:28 ` Furquan Shaikh
2022-08-12 11:28 ` Peter Maydell
2022-08-12 23:11 ` Furquan Shaikh
2022-08-12 23:27 ` Richard Henderson
2022-08-12 23:42 ` Richard Henderson
2022-08-12 23:57 ` Furquan Shaikh
2022-08-13 0:30 ` Richard Henderson
2022-08-13 0:50 ` Furquan Shaikh
2022-08-13 2:31 ` Richard Henderson
2022-08-13 5:22 ` Furquan Shaikh
2022-08-13 10:19 ` Peter Maydell
2022-08-14 22:03 ` Alistair Francis [this message]
2022-08-15 6:24 ` Furquan Shaikh
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