From: Peter Maydell <peter.maydell@linaro.org>
To: Richard Henderson <richard.henderson@linaro.org>
Cc: "Keith Packard" <keithp@keithp.com>,
"Alex Bennée" <alex.bennee@linaro.org>,
"QEMU Developers" <qemu-devel@nongnu.org>
Subject: Re: [PATCH] Semihost SYS_READC implementation (v4)
Date: Thu, 14 Nov 2019 21:04:51 +0000 [thread overview]
Message-ID: <CAFEAcA-BFoi00BWmXjEHGyML5FGdYF3eQnUiWUZrqFNtbP34Xw@mail.gmail.com> (raw)
In-Reply-To: <79acf595-5cc3-b795-24c9-e4511071c6c8@linaro.org>
On Thu, 14 Nov 2019 at 20:52, Richard Henderson
<richard.henderson@linaro.org> wrote:
> Yet another reason why I prefer any semi-hosting call to use an encoding that
> is otherwise reserved illegal.
>
> For this, you have to make up your mind: is it important to execute the
> instructions as specified by the ISA, or as specified by the semi-hosting spec?
>
> In this case, semi-hosting defines an "entry nop" that begins the sequence, and
> I think that we are well within our rights to ignore the validity of "insn1
> insn2 || other-insn".
Perhaps. I think you get the same issue with
insn1 || insn2
vs
insn1 || some-other-insn
though. (And the spec has wording that explicitly wants the
latter to be handled with the normal "I'm a hint instruction"
behaviour of insn1.)
-- PMM
next prev parent reply other threads:[~2019-11-14 21:05 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-23 19:26 [PATCH] Semihost SYS_READC implementation (v3) Keith Packard
2019-10-24 17:33 ` no-reply
2019-10-24 18:54 ` Paolo Bonzini
2019-10-24 22:46 ` [PATCH] Semihost SYS_READC implementation (v4) Keith Packard
2019-10-25 9:51 ` Alex Bennée
2019-10-25 16:36 ` Keith Packard
2019-10-25 16:49 ` Peter Maydell
2019-10-25 19:15 ` Keith Packard
2019-10-25 20:53 ` Peter Maydell
2019-10-25 23:18 ` Keith Packard
2019-11-04 20:42 ` [PATCH] Semihost SYS_READC implementation (v6) Keith Packard
2019-12-17 8:38 ` Alex Bennée
2019-12-17 9:08 ` Paolo Bonzini
2019-12-17 9:51 ` Alex Bennée
2019-12-17 10:04 ` Paolo Bonzini
2019-12-17 12:14 ` [RFC PATCH] semihosting: suspend recieving CPU when blocked (HACK, WIP) Alex Bennée
2019-12-17 12:22 ` Paolo Bonzini
2019-12-17 13:42 ` Alex Bennée
2019-12-17 13:48 ` Paolo Bonzini
2019-12-17 14:18 ` Alex Bennée
2019-12-17 14:39 ` Paolo Bonzini
2019-12-17 14:39 ` Paolo Bonzini
2019-12-18 17:36 ` Alex Bennée
2019-12-18 21:23 ` Paolo Bonzini
2019-11-05 5:10 ` [PATCH] Semihost SYS_READC implementation (v4) Keith Packard
2019-11-11 14:51 ` Peter Maydell
2019-11-14 15:46 ` Alistair Francis
2019-11-14 17:43 ` Keith Packard
2019-11-14 17:39 ` Keith Packard
2019-11-14 17:47 ` Peter Maydell
2019-11-14 19:20 ` Peter Maydell
2019-11-14 16:14 ` Peter Maydell
2019-11-14 18:05 ` Keith Packard
2019-11-14 18:18 ` Peter Maydell
2019-11-14 19:18 ` Richard Henderson
2019-11-14 19:29 ` Peter Maydell
2019-11-14 20:52 ` Richard Henderson
2019-11-14 21:04 ` Peter Maydell [this message]
2019-11-14 22:26 ` Keith Packard
2019-11-15 10:54 ` Peter Maydell
2019-11-15 23:40 ` Keith Packard
2019-10-25 17:02 ` Alex Bennée
2019-10-25 18:17 ` no-reply
2019-10-25 18:20 ` no-reply
2019-10-24 17:43 ` [PATCH] Semihost SYS_READC implementation (v3) no-reply
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