From: Bastian Koppelmann <kbastian@mail.uni-paderborn.de>
To: Richard Henderson <rth@twiddle.net>
Cc: peter.maydell@linaro.org, Ethan Hunt <proljc@gmail.com>,
qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH 12/17] target-openrisc: Enable m[tf]spr from user mode
Date: Sun, 13 Sep 2015 10:34:04 +0200 [thread overview]
Message-ID: <55F534FC.1030907@mail.uni-paderborn.de> (raw)
In-Reply-To: <25f6c6b5-ea69-4f3c-9c4c-d17a8cebba45@email.android.com>
On 09/06/2015 10:36 PM, Richard Henderson wrote:
> On Sep 5, 2015 14:35, Bastian Koppelmann <kbastian@mail.uni-paderborn.de> wrote:
>> IIRC a lot of the registers are supervisor only, e.g. VR, NPC or SR and
>> the manual is fairly clear about that. User mode cpu ought not to read
>> these registers unconditionally.
> When I last discussed this on the openrisc list, back in March, there was no real specification for user mode, and what bits are or should be accessible.
>
> Looking at
> http://opencores.org/or1k/Architecture_Specification
> today, that still seems to be the case.
>
> In the meantime, dropping the privilege check makes linux-user GCC tests work better.
>
Looking at the article, user mode seems to be optional, so I'm not
against it, but it does look weird. How does ork1sim do it?
Cheers,
Bastian
next prev parent reply other threads:[~2015-09-13 8:34 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-03 0:17 [Qemu-devel] [PATCH 00/17] target-openrisc improvements Richard Henderson
2015-09-03 0:17 ` [Qemu-devel] [PATCH 01/17] target-openrisc: Always enable OPENRISC_DISAS Richard Henderson
2015-09-03 14:15 ` Bastian Koppelmann
2015-09-03 0:17 ` [Qemu-devel] [PATCH 02/17] target-openrisc: Streamline arithmetic and OVE Richard Henderson
2015-09-03 14:16 ` Bastian Koppelmann
2015-09-03 14:44 ` Richard Henderson
2015-09-04 13:12 ` Bastian Koppelmann
2015-09-03 0:17 ` [Qemu-devel] [PATCH 03/17] target-openrisc: Invert the decoding in dec_calc Richard Henderson
2015-09-03 14:48 ` Bastian Koppelmann
2015-09-03 0:17 ` [Qemu-devel] [PATCH 04/17] target-openrisc: Keep SR_F in a separate variable Richard Henderson
2015-09-03 15:09 ` Bastian Koppelmann
2015-09-03 0:17 ` [Qemu-devel] [PATCH 05/17] target-openrisc: Use movcond where appropriate Richard Henderson
2015-09-03 16:04 ` Bastian Koppelmann
2015-09-03 0:17 ` [Qemu-devel] [PATCH 06/17] target-openrisc: Put SR[OVE] in TB flags Richard Henderson
2015-09-04 13:05 ` Bastian Koppelmann
2015-09-04 14:29 ` Richard Henderson
2015-09-03 0:17 ` [Qemu-devel] [PATCH 07/17] target-openrisc: Keep SR_CY and SR_OV in a separate variables Richard Henderson
2015-09-04 13:33 ` Bastian Koppelmann
2015-09-03 0:17 ` [Qemu-devel] [PATCH 08/17] target-openrisc: Set flags on helpers Richard Henderson
2015-09-04 13:58 ` Bastian Koppelmann
2015-09-03 0:17 ` [Qemu-devel] [PATCH 09/17] target-openrisc: Implement ff1 and fl1 for 64-bit Richard Henderson
2015-09-04 13:59 ` Bastian Koppelmann
2015-09-03 0:17 ` [Qemu-devel] [PATCH 10/17] target-openrisc: Represent MACHI:MACLO as a single unit Richard Henderson
2015-09-04 15:04 ` Bastian Koppelmann
2015-09-03 0:17 ` [Qemu-devel] [PATCH 11/17] target-openrisc: Rationalize immediate extraction Richard Henderson
2015-09-04 15:24 ` Bastian Koppelmann
2015-09-03 0:17 ` [Qemu-devel] [PATCH 12/17] target-openrisc: Enable m[tf]spr from user mode Richard Henderson
2015-09-05 21:35 ` Bastian Koppelmann
2015-09-06 20:36 ` Richard Henderson
2015-09-13 8:34 ` Bastian Koppelmann [this message]
2015-09-14 17:11 ` Richard Henderson
2015-09-15 7:22 ` Bastian Koppelmann
2015-09-03 0:17 ` [Qemu-devel] [PATCH 13/17] target-openrisc: Enable trap, csync, msync, psync for " Richard Henderson
2015-09-06 9:30 ` Bastian Koppelmann
2015-09-03 0:17 ` [Qemu-devel] [PATCH 14/17] target-openrisc: Implement muld, muldu, macu, msbu Richard Henderson
2015-09-06 11:38 ` Bastian Koppelmann
2015-09-03 0:17 ` [Qemu-devel] [PATCH 15/17] target-openrisc: Fix madd Richard Henderson
2015-09-13 8:21 ` Bastian Koppelmann
2015-09-03 0:17 ` [Qemu-devel] [PATCH 16/17] target-openrisc: Write back result before FPE exception Richard Henderson
2015-09-15 13:02 ` Bastian Koppelmann
2015-09-03 0:17 ` [Qemu-devel] [PATCH 17/17] target-openrisc: Implement lwa, swa Richard Henderson
2015-09-15 13:04 ` Bastian Koppelmann
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