All of lore.kernel.org
 help / color / mirror / Atom feed
From: Max Filippov <jcmvbkbc@gmail.com>
To: Richard Henderson <rth@twiddle.net>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [RFC 18/28] target-xtensa: implement exceptions
Date: Mon, 9 May 2011 23:38:45 +0400	[thread overview]
Message-ID: <201105092338.46339.jcmvbkbc@gmail.com> (raw)
In-Reply-To: <4DC18641.2080904@twiddle.net>

> > This is a case where you almost certainly want to check this 
> > condition inside QEMU and translate the opcode differently.
> > 
> > See cpu_get_tb_cpu_state, which sets bits in *flags.  These
> > flags can then be checked in tb->flags while translating.
> > At which point you'd avoid all the conditionalization on
> > the value in PS here in check_privilege and merely issue
> > the exception_cause.
> > 
> > The ARM port is a good example for testing these sorts of bits.
> 
> Actually, while the tb flags are useful, privileged instructions
> are usually checked by testing mmu_index, since we already have
> to generate different code for the TB based on which TLB entry we
> need to access.

Richard,
do I understand it right that if I use tb->flags or mem_index to make decisions during translation, then I must issue exit_tb on instructions that can change state they reflect?

Thanks.
-- Max

  reply	other threads:[~2011-05-09 19:38 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-05-04  0:59 [Qemu-devel] [RFC 01/28] target-xtensa: add target stubs Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 02/28] target-xtensa: add target to the configure script Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 03/28] target-xtensa: implement disas_xtensa_insn Max Filippov
2011-05-04 15:39   ` Richard Henderson
2011-05-04  0:59 ` [Qemu-devel] [RFC 04/28] target-xtensa: implement narrow instructions Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 05/28] target-xtensa: implement RT0 group Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 06/28] target-xtensa: add sample board Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 07/28] target-xtensa: add gdb support Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 08/28] target-xtensa: implement conditional jumps Max Filippov
2011-05-04 15:45   ` Richard Henderson
2011-05-04  0:59 ` [Qemu-devel] [RFC 09/28] target-xtensa: implement JX/RET0/CALLX Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 10/28] target-xtensa: add special and user registers Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 11/28] target-xtensa: implement RST3 group Max Filippov
2011-05-04 15:51   ` Richard Henderson
2011-05-04  0:59 ` [Qemu-devel] [RFC 12/28] target-xtensa: implement shifts (ST1 and RST1 groups) Max Filippov
2011-05-04 16:16   ` Richard Henderson
2011-05-04 16:39     ` Max Filippov
2011-05-04 19:07       ` Richard Henderson
2011-05-05  8:40         ` Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 13/28] target-xtensa: implement LSAI group Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 14/28] target-xtensa: mark reserved and TBD opcodes Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 15/28] target-xtensa: big endian support Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 16/28] target-xtensa: implement SYNC group Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 17/28] target-xtensa: implement CACHE group Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 18/28] target-xtensa: implement exceptions Max Filippov
2011-05-04 16:33   ` Richard Henderson
2011-05-04 17:00     ` Richard Henderson
2011-05-09 19:38       ` Max Filippov [this message]
2011-05-09 20:32         ` Richard Henderson
2011-05-04  0:59 ` [Qemu-devel] [RFC 19/28] target-xtensa: implement RST2 group (32 bit mul/div/rem) Max Filippov
2011-05-04 19:36   ` Blue Swirl
2011-05-05  8:27     ` Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 20/28] target-xtensa: implement windowed registers Max Filippov
2011-05-04 19:35   ` Blue Swirl
2011-05-04 20:07     ` Richard Henderson
2011-05-04 20:13       ` Blue Swirl
2011-05-04 20:30         ` Richard Henderson
2011-05-04  0:59 ` [Qemu-devel] [RFC 21/28] target-xtensa: implement loop option Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 22/28] target-xtensa: implement extended L32R Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 23/28] target-xtensa: implement unaligned exception option Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 24/28] target-xtensa: implement SIMCALL Max Filippov
2011-05-04 19:48   ` Blue Swirl
2011-05-04 20:31     ` Peter Maydell
2011-05-04  0:59 ` [Qemu-devel] [RFC 25/28] target-xtensa: implement interrupt option Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 26/28] target-xtensa: implement accurate window check Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 27/28] target-xtensa: implement CPENABLE and PRID SRs Max Filippov
2011-05-04  0:59 ` [Qemu-devel] [RFC 28/28] target-xtensa: implement relocatable vectors Max Filippov
2011-05-04  6:04 ` [Qemu-devel] [RFC 01/28] target-xtensa: add target stubs Max Filippov
2011-05-04 19:51 ` Blue Swirl

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=201105092338.46339.jcmvbkbc@gmail.com \
    --to=jcmvbkbc@gmail.com \
    --cc=qemu-devel@nongnu.org \
    --cc=rth@twiddle.net \
    /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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.