From: Kyrill Tkachov <kyrylo.tkachov@foss.arm.com>
To: Christophe Lyon <christophe.lyon@st.com>,
"gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>
Subject: Re: [ARM/FDPIC v5 13/21] [ARM] FDPIC: Force LSB bit for PC in Cortex-M architecture
Date: Thu, 29 Aug 2019 15:37:00 -0000 [thread overview]
Message-ID: <19a091e0-c1fe-c4f7-5eab-5e09ab1de3fd@foss.arm.com> (raw)
In-Reply-To: <20190515124006.25840-14-christophe.lyon@st.com>
Hi Christophe,
On 5/15/19 1:39 PM, Christophe Lyon wrote:
> Without this, when we are unwinding across a signal frame we can jump
> to an even address which leads to an exception.
>
> This is needed in __gnu_persnality_sigframe_fdpic() when restoring the
> PC from the signal frame since the PC saved by the kernel has the LSB
> bit set to zero.
>
> 2019-XX-XX Christophe Lyon <christophe.lyon@st.com>
>        Mickaël Guêné <mickael.guene@st.com>
>
> Â Â Â Â Â Â Â libgcc/
> Â Â Â Â Â Â Â * config/arm/unwind-arm.c (_Unwind_VRS_Set): Handle v7m
> Â Â Â Â Â Â Â architecture.
>
> Change-Id: Ie84de548226bcf1751e19a09e8f091fb3013ccea
>
> diff --git a/libgcc/config/arm/unwind-arm.c
> b/libgcc/config/arm/unwind-arm.c
> index 9ba73e7..ba47150 100644
> --- a/libgcc/config/arm/unwind-arm.c
> +++ b/libgcc/config/arm/unwind-arm.c
> @@ -199,6 +199,11 @@ _Unwind_VRS_Result _Unwind_VRS_Set
> (_Unwind_Context *context,
> Â Â Â Â Â Â Â Â return _UVRSR_FAILED;
>
> Â Â Â Â Â Â vrs->core.r[regno] = *(_uw *) valuep;
> +#if defined(__ARM_ARCH_7M__)
> +     /* Force LSB bit since we always run thumb code. */
> +Â Â Â Â Â if (regno == 15)
> +Â Â Â Â Â Â vrs->core.r[regno] |= 1;
> +#endif
Hmm, this looks quite specific. There are other architectures that are
thumb-only too (6-M, 7E-M etc).
Would checking for __thumb__ be better?
Thanks,
Kyrill
> Â Â Â Â Â Â return _UVRSR_OK;
>
> Â Â Â Â case _UVRSC_VFP:
> --
> 2.6.3
>
next prev parent reply other threads:[~2019-08-29 15:32 UTC|newest]
Thread overview: 109+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-15 12:40 [ARM/FDPIC v5 00/21] FDPIC ABI for ARM Christophe Lyon
2019-05-15 12:40 ` [ARM/FDPIC v5 01/21] [ARM] FDPIC: Add -mfdpic option support Christophe Lyon
2019-07-16 10:18 ` Richard Sandiford
2019-08-29 15:08 ` Christophe Lyon
2019-08-30 10:06 ` Richard Sandiford
2019-05-15 12:41 ` [ARM/FDPIC v5 03/21] [ARM] FDPIC: Force FDPIC related options unless -mno-fdpic is provided Christophe Lyon
2019-05-15 13:55 ` Szabolcs Nagy
2019-05-15 14:37 ` Rich Felker
2019-05-15 15:12 ` Christophe Lyon
2019-05-15 15:37 ` Rich Felker
2019-05-15 15:59 ` Szabolcs Nagy
2019-05-15 16:07 ` Rich Felker
2019-05-21 15:29 ` Christophe Lyon
2019-05-21 15:48 ` Rich Felker
2019-05-22 8:39 ` Szabolcs Nagy
2019-05-22 8:45 ` Christophe Lyon
2019-05-23 12:45 ` Christophe Lyon
2019-07-16 10:38 ` Richard Sandiford
2019-07-16 20:00 ` Rich Felker
2019-08-01 10:13 ` Christophe Lyon
2019-08-06 14:28 ` Richard Sandiford
2019-08-29 15:14 ` Christophe Lyon
2019-08-30 9:40 ` Richard Sandiford
2019-05-15 12:41 ` [ARM/FDPIC v5 04/21] [ARM] FDPIC: Add support for FDPIC for arm architecture Christophe Lyon
2019-07-16 12:33 ` Richard Sandiford
2019-08-20 17:13 ` Christophe Lyon
2019-08-29 15:39 ` Christophe Lyon
2019-09-02 16:12 ` Richard Sandiford
2019-09-02 20:04 ` Christophe Lyon
2019-09-03 8:40 ` Richard Sandiford
2019-09-04 19:59 ` Christophe Lyon
2019-09-05 8:03 ` Richard Sandiford
2019-05-15 12:41 ` [ARM/FDPIC v5 05/21] [ARM] FDPIC: Fix __do_global_dtors_aux and frame_dummy generation Christophe Lyon
2019-07-12 6:49 ` Richard Sandiford
2019-07-12 14:25 ` Christophe Lyon
2019-08-29 15:39 ` Christophe Lyon
2019-08-30 8:41 ` Richard Sandiford
2019-05-15 12:41 ` [ARM/FDPIC v5 02/21] [ARM] FDPIC: Handle arm*-*-uclinuxfdpiceabi in configure scripts Christophe Lyon
2019-07-12 7:44 ` Richard Sandiford
2019-07-12 13:25 ` Christophe Lyon
2019-07-12 13:28 ` Richard Sandiford
2019-08-29 15:14 ` Christophe Lyon
2019-08-30 9:30 ` Richard Sandiford
2019-08-30 14:48 ` Christophe Lyon
2019-08-30 15:15 ` Richard Sandiford
2019-09-02 7:51 ` Christophe Lyon
2019-09-02 8:31 ` Richard Sandiford
2019-08-30 14:40 ` Jonathan Wakely
2019-05-15 12:42 ` [ARM/FDPIC v5 06/21] [ARM] FDPIC: Add support for c++ exceptions Christophe Lyon
2019-08-30 9:31 ` Kyrill Tkachov
2019-08-30 14:44 ` Jonathan Wakely
2019-05-15 12:42 ` [ARM/FDPIC v5 07/21] [ARM] FDPIC: Avoid saving/restoring r9 on stack since it is read-only Christophe Lyon
2019-07-16 10:42 ` Kyrill Tkachov
2019-05-15 12:43 ` [ARM/FDPIC v5 08/21] [ARM] FDPIC: Enforce local/global binding for function descriptors Christophe Lyon
2019-07-16 10:51 ` Kyrill Tkachov
2019-05-15 12:43 ` [ARM/FDPIC v5 09/21] [ARM] FDPIC: Add support for taking address of nested function Christophe Lyon
2019-07-16 11:53 ` Kyrill Tkachov
2019-07-16 13:31 ` Kyrill Tkachov
2019-07-31 14:48 ` Christophe Lyon
2019-08-29 15:40 ` Christophe Lyon
2019-08-30 8:54 ` Kyrill Tkachov
2019-05-15 12:43 ` [ARM/FDPIC v5 10/21] [ARM] FDPIC: Implement TLS support Christophe Lyon
2019-09-04 14:16 ` Kyrill Tkachov
2019-09-04 20:03 ` Christophe Lyon
2019-09-09 8:54 ` Christophe Lyon
2019-05-15 12:44 ` [ARM/FDPIC v5 13/21] [ARM] FDPIC: Force LSB bit for PC in Cortex-M architecture Christophe Lyon
2019-08-29 15:37 ` Kyrill Tkachov [this message]
2019-09-05 8:30 ` Christophe Lyon
2019-09-05 8:32 ` Christophe Lyon
2019-09-05 20:56 ` Ian Lance Taylor
2019-09-05 9:03 ` Kyrill Tkachov
2019-09-09 8:58 ` Christophe Lyon
2019-05-15 12:44 ` [ARM/FDPIC v5 12/21] [ARM] FDPIC: Restore r9 after we call __aeabi_read_tp Christophe Lyon
2019-08-29 15:40 ` Christophe Lyon
2019-08-29 15:44 ` Kyrill Tkachov
2019-05-15 12:44 ` [ARM/FDPIC v5 11/21] [ARM] FDPIC: Add support to unwind FDPIC signal frame Christophe Lyon
2019-09-04 14:19 ` Kyrill Tkachov
2019-05-15 12:45 ` [ARM/FDPIC v5 14/21] [ARM][testsuite] FDPIC: Skip unsupported tests Christophe Lyon
2019-07-19 8:52 ` Kyrill Tkachov
2019-05-15 12:45 ` [ARM/FDPIC v5 16/21] [ARM][testsuite] FDPIC: Skip tests that don't work in PIC mode Christophe Lyon
2019-07-19 8:56 ` Kyrill Tkachov
2019-05-15 12:45 ` [ARM/FDPIC v5 15/21] [ARM][testsuite] FDPIC: Adjust scan-assembler patterns Christophe Lyon
2019-07-19 8:54 ` Kyrill Tkachov
2019-05-15 12:46 ` [ARM/FDPIC v5 18/21] [ARM][testsuite] FDPIC: Enable tests on pie_enabled targets Christophe Lyon
2019-07-19 8:59 ` Kyrill Tkachov
2019-07-22 19:50 ` Mike Stump
2019-05-15 12:46 ` [ARM/FDPIC v5 17/21] [ARM][testsuite] FDPIC: Handle *-*-uclinux* Christophe Lyon
2019-07-19 8:57 ` Kyrill Tkachov
2019-07-22 19:37 ` Mike Stump
2019-05-15 12:46 ` [ARM/FDPIC v5 19/21] [ARM][testsuite] FDPIC: Adjust pr43698.c to avoid clash with uclibc Christophe Lyon
2019-07-19 9:00 ` Kyrill Tkachov
2019-05-15 12:47 ` [ARM/FDPIC v5 20/21] [ARM][testsuite] FDPIC: Skip tests using architectures unsupported by FDPIC Christophe Lyon
2019-07-19 9:03 ` Kyrill Tkachov
2019-09-06 8:01 ` Christophe Lyon
2019-09-06 8:28 ` Kyrill Tkachov
2019-09-06 9:10 ` Christophe Lyon
2019-09-06 17:44 ` Christophe Lyon
2019-09-09 8:38 ` Christophe Lyon
2019-05-15 12:47 ` [ARM/FDPIC v5 21/21] [ARM] FDPIC: Handle stack-protector combined patterns Christophe Lyon
2019-07-19 9:40 ` Kyrill Tkachov
2019-05-23 12:46 ` [ARM/FDPIC v5 00/21] FDPIC ABI for ARM Christophe Lyon
2019-06-04 12:57 ` Christophe Lyon
2019-06-06 12:36 ` Christophe Lyon
2019-06-17 11:42 ` Christophe Lyon
2019-07-01 12:16 ` Christophe Lyon
2019-07-08 14:28 ` Christophe Lyon
2019-07-16 9:13 ` Christophe Lyon
2019-08-29 14:54 ` Christophe Lyon
2019-08-29 16:29 ` Christophe Lyon
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=19a091e0-c1fe-c4f7-5eab-5e09ab1de3fd@foss.arm.com \
--to=kyrylo.tkachov@foss.arm.com \
--cc=christophe.lyon@st.com \
--cc=gcc-patches@gcc.gnu.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 read-only IMAP folder(s) and NNTP newsgroup(s).