From: Stafford Horne <shorne@gmail.com>
To: QEMU Development <qemu-devel@nongnu.org>
Cc: Linux OpenRISC <linux-openrisc@vger.kernel.org>,
Stafford Horne <shorne@gmail.com>
Subject: [PATCH 0/3] OpenRISC updates for user space FPU
Date: Tue, 2 May 2023 19:57:28 +0100 [thread overview]
Message-ID: <20230502185731.3543420-1-shorne@gmail.com> (raw)
This series adds support for the FPU related architecture changes defined in
architecture spec revision v1.4.
- https://openrisc.io/revisions/r1.4
In summary the architecture changes are:
- Change FPCSR SPR permissions to allow for reading and writing from user
space.
- Clarify that FPU underflow detection is done by detecting tininess before
rounding.
Previous to this series FPCSR reads and writes from user-mode in QEMU would
throw an illegal argument exception. The proper behavior should have been to
treat these operations as no-ops as the cpu implementations do. As mentioned
series changes FPCSR read/write to follow the spec.
The series has been tested with the FPU support added in glibc test suite and
all math tests are passing.
Stafford Horne (3):
target/openrisc: Allow fpcsr access in user mode
target/openrisc: Set PC to cpu state on FPU exception
target/openrisc: Setup FPU for detecting tininess before rounding
target/openrisc/cpu.c | 5 +++
target/openrisc/fpu_helper.c | 4 ++
target/openrisc/sys_helper.c | 45 +++++++++++++++++-----
target/openrisc/translate.c | 72 ++++++++++++++++--------------------
4 files changed, 76 insertions(+), 50 deletions(-)
--
2.39.1
next reply other threads:[~2023-05-02 18:57 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-02 18:57 Stafford Horne [this message]
2023-05-02 18:57 ` [PATCH 1/3] target/openrisc: Allow fpcsr access in user mode Stafford Horne
2023-05-03 6:29 ` Stafford Horne
2023-05-02 18:57 ` [PATCH 2/3] target/openrisc: Set PC to cpu state on FPU exception Stafford Horne
2023-05-03 7:36 ` Richard Henderson
2023-05-03 9:12 ` Stafford Horne
2023-05-02 18:57 ` [PATCH 3/3] target/openrisc: Setup FPU for detecting tininess before rounding Stafford Horne
2023-05-03 7:37 ` Richard Henderson
2023-05-03 9:14 ` Stafford Horne
2023-05-03 9:41 ` Richard Henderson
2023-05-03 16:31 ` Stafford Horne
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20230502185731.3543420-1-shorne@gmail.com \
--to=shorne@gmail.com \
--cc=linux-openrisc@vger.kernel.org \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).