From: Fredrik Noring <noring@nocrew.org>
To: "Maciej W. Rozycki" <macro@imgtec.com>
Cc: linux-mips@linux-mips.org
Subject: Re: [PATCH] MIPS: Add basic R5900 support
Date: Fri, 15 Sep 2017 15:19:46 +0200 [thread overview]
Message-ID: <20170915131945.GA32582@localhost.localdomain> (raw)
In-Reply-To: <alpine.DEB.2.00.1709151136220.16752@tp.orcam.me.uk>
Hi Maciej,
> I wonder if FS=1 hardwired also means the Underflow exception cannot
> happen. As the corresponding Cause and Enable bits cannot be set together
> or an FPE exception will happen right away, and the Unimplemented
> Operation exception is uncoditional so we need to leave it out, can you
> please also try these masks in turns:
>
> " li %1,0x0001f07c\n"
>
> and:
>
> " li %1,0x00000f80\n"
>
> This will reveal if any of the Cause, Enable or Flag bits are hardwired.
The result is:
FCSR 0x0001f07c old: 01000001, new: 0101c079
FCSR 0x00000f80 old: 01000001, new: 01000001
I was looking for information on GCC for R5900 and found
https://gcc.gnu.org/ml/gcc-patches/2013-01/msg00658.html
where you and Jürgen Urban discuss this topic. Jürgen cites some FPU details
from the Emotion Engine core user's manual that is very helpful, in addition
to mentioning TX79 differences.
Fredrik
next prev parent reply other threads:[~2017-09-15 13:20 UTC|newest]
Thread overview: 117+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-27 13:23 [PATCH] MIPS: Add basic R5900 support Fredrik Noring
2017-08-28 13:53 ` Ralf Baechle
2017-08-28 17:11 ` Maciej W. Rozycki
2017-08-29 17:33 ` Fredrik Noring
2017-08-29 17:24 ` Maciej W. Rozycki
2017-08-29 17:24 ` Maciej W. Rozycki
2017-08-30 13:23 ` Fredrik Noring
2017-08-31 15:11 ` Maciej W. Rozycki
2017-08-31 15:11 ` Maciej W. Rozycki
2017-09-02 10:28 ` Fredrik Noring
2017-09-09 10:13 ` Maciej W. Rozycki
2017-09-09 10:13 ` Maciej W. Rozycki
2017-09-11 5:21 ` Maciej W. Rozycki
2017-09-11 5:21 ` Maciej W. Rozycki
2017-09-12 17:59 ` Fredrik Noring
2017-09-15 11:12 ` Maciej W. Rozycki
2017-09-15 11:12 ` Maciej W. Rozycki
2017-09-15 13:19 ` Fredrik Noring [this message]
2017-09-15 18:28 ` Maciej W. Rozycki
2017-09-15 18:28 ` Maciej W. Rozycki
2017-09-02 14:10 ` [PATCH v2] " Fredrik Noring
2017-09-11 5:18 ` Maciej W. Rozycki
2017-09-11 5:18 ` Maciej W. Rozycki
2017-09-11 15:17 ` Fredrik Noring
2017-09-14 13:50 ` Maciej W. Rozycki
2017-09-14 13:50 ` Maciej W. Rozycki
2017-09-16 13:34 ` Fredrik Noring
2017-09-18 17:05 ` Maciej W. Rozycki
2017-09-18 17:05 ` Maciej W. Rozycki
2017-09-18 19:24 ` Fredrik Noring
2017-09-19 12:44 ` Maciej W. Rozycki
2017-09-19 12:44 ` Maciej W. Rozycki
2017-09-20 14:54 ` Fredrik Noring
2017-09-26 11:50 ` Maciej W. Rozycki
2017-09-26 11:50 ` Maciej W. Rozycki
2017-09-27 17:21 ` Fredrik Noring
2017-09-28 12:13 ` Maciej W. Rozycki
2017-09-28 12:13 ` Maciej W. Rozycki
2017-09-30 6:56 ` Fredrik Noring
2017-10-02 9:05 ` Maciej W. Rozycki
2017-10-02 9:05 ` Maciej W. Rozycki
2017-10-02 16:33 ` Fredrik Noring
2017-10-29 17:20 ` Fredrik Noring
2017-11-10 23:34 ` Maciej W. Rozycki
2017-11-10 23:34 ` Maciej W. Rozycki
2017-11-11 16:04 ` Fredrik Noring
2018-01-29 20:27 ` Fredrik Noring
2018-01-31 23:01 ` Maciej W. Rozycki
2018-02-11 7:29 ` [RFC] MIPS: R5900: Workaround for the short loop bug Fredrik Noring
2018-02-12 9:25 ` Maciej W. Rozycki
2018-02-12 15:22 ` Fredrik Noring
2018-02-11 7:46 ` [RFC] MIPS: R5900: Use SYNC.L for data cache and SYNC.P for instruction cache Fredrik Noring
2018-02-11 7:56 ` [RFC] MIPS: R5900: Workaround exception NOP execution bug (FLX05) Fredrik Noring
2018-02-12 9:28 ` Maciej W. Rozycki
2018-02-15 19:15 ` [RFC v2] " Fredrik Noring
2018-02-15 20:49 ` Maciej W. Rozycki
2018-02-17 11:16 ` Fredrik Noring
2018-02-17 11:57 ` Maciej W. Rozycki
2018-02-17 13:38 ` Fredrik Noring
2018-02-17 15:03 ` Maciej W. Rozycki
2018-02-17 20:04 ` Fredrik Noring
2018-02-20 14:09 ` Maciej W. Rozycki
2018-02-22 17:04 ` Fredrik Noring
2018-02-18 8:47 ` Fredrik Noring
2018-02-20 14:41 ` Maciej W. Rozycki
2018-02-22 17:27 ` Fredrik Noring
2018-02-11 8:01 ` [RFC] MIPS: R5900: Workaround for CACHE instruction near branch delay slot Fredrik Noring
2018-02-11 11:16 ` Aw: " "Jürgen Urban"
2018-02-11 8:09 ` [RFC] MIPS: R5900: The ERET instruction has issues with delay slot and CACHE Fredrik Noring
2018-02-11 11:07 ` Aw: " "Jürgen Urban"
2018-02-11 8:29 ` [RFC] MIPS: R5900: Use mandatory SYNC.L in exception handlers Fredrik Noring
2018-02-11 10:33 ` Aw: " "Jürgen Urban"
2018-02-12 9:22 ` Maciej W. Rozycki
2018-02-12 9:22 ` Maciej W. Rozycki
2018-02-18 10:30 ` Fredrik Noring
2018-02-17 14:43 ` [RFC] MIPS: R5900: Workaround for saving and restoring FPU registers Fredrik Noring
2018-02-17 15:18 ` Maciej W. Rozycki
2018-02-17 17:47 ` Fredrik Noring
2018-02-17 19:33 ` Maciej W. Rozycki
2018-02-18 9:26 ` [RFC] MIPS: R5900: Workaround where MSB must be 0 for the instruction cache Fredrik Noring
2018-02-18 11:08 ` [RFC] MIPS: R5900: Add mandatory SYNC.P to all M[FT]C0 instructions Fredrik Noring
2018-03-03 12:26 ` [RFC] MIPS: PS2: Interrupt request (IRQ) support Fredrik Noring
2018-03-03 13:09 ` Maciej W. Rozycki
2018-03-03 14:14 ` Fredrik Noring
2018-04-09 15:51 ` Fredrik Noring
2018-03-18 10:45 ` Fredrik Noring
2018-03-19 19:15 ` Thomas Gleixner
2018-06-18 18:52 ` [RFC v2] " Fredrik Noring
2017-10-30 17:55 ` [PATCH v2] MIPS: Add basic R5900 support Fredrik Noring
2017-11-24 10:26 ` Maciej W. Rozycki
2017-11-24 10:26 ` Maciej W. Rozycki
2017-11-24 10:39 ` Maciej W. Rozycki
2017-11-24 10:39 ` Maciej W. Rozycki
2017-09-20 14:07 ` Fredrik Noring
2017-09-21 21:07 ` Maciej W. Rozycki
2017-09-21 21:07 ` Maciej W. Rozycki
2017-09-22 16:37 ` Fredrik Noring
2017-09-22 16:37 ` Fredrik Noring
2017-09-29 23:55 ` Maciej W. Rozycki
2017-09-29 23:55 ` Maciej W. Rozycki
2017-09-30 18:26 ` Fredrik Noring
2017-10-02 9:11 ` Maciej W. Rozycki
2017-10-02 9:11 ` Maciej W. Rozycki
2017-10-03 19:49 ` Fredrik Noring
2017-10-05 19:04 ` Fredrik Noring
2017-10-06 20:28 ` Fredrik Noring
2017-10-15 16:39 ` Fredrik Noring
2017-10-17 12:23 ` Maciej W. Rozycki
2017-10-17 12:23 ` Maciej W. Rozycki
2017-10-21 18:00 ` Fredrik Noring
2017-10-23 16:10 ` Maciej W. Rozycki
2017-10-23 16:10 ` Maciej W. Rozycki
2017-09-21 18:11 ` Paul Burton
2017-09-21 18:11 ` Paul Burton
2017-09-21 19:48 ` Maciej W. Rozycki
2017-09-21 19:48 ` Maciej W. Rozycki
2017-10-29 18:42 ` Fredrik Noring
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