From: Christophe Lyon <christophe.lyon@st.com>
To: <gcc-patches@gcc.gnu.org>
Cc: <christophe.lyon@linaro.org>
Subject: [ARM/FDPIC v4 13/20] [ARM] FDPIC: Force LSB bit for PC in Cortex-M architecture
Date: Fri, 16 Nov 2018 15:52:00 -0000 [thread overview]
Message-ID: <20181116154808.25154-14-christophe.lyon@st.com> (raw)
In-Reply-To: <20181116154808.25154-1-christophe.lyon@st.com>
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.
2018-XX-XX Christophe Lyon <christophe.lyon@st.com>
Mickaël Guêné <mickael.guene@st.com>
libgcc/
* config/arm/unwind-arm.c (_Unwind_VRS_Set): Handle v7m
architecture.
Change-Id: Ie84de548226bcf1751e19a09e8f091fb3013ccea
diff --git a/libgcc/config/arm/unwind-arm.c b/libgcc/config/arm/unwind-arm.c
index 564e4f13..6da6e3d 100644
--- a/libgcc/config/arm/unwind-arm.c
+++ b/libgcc/config/arm/unwind-arm.c
@@ -198,6 +198,11 @@ _Unwind_VRS_Result _Unwind_VRS_Set (_Unwind_Context *context,
return _UVRSR_FAILED;
vrs->core.r[regno] = *(_uw *) valuep;
+#if defined(__ARM_ARCH_7M__)
+ /* Force LSB bit since we always run thumb code. */
+ if (regno == 15)
+ vrs->core.r[regno] |= 1;
+#endif
return _UVRSR_OK;
case _UVRSC_VFP:
--
2.6.3
next prev parent reply other threads:[~2018-11-16 15:52 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-16 15:48 [ARM/FDPIC v4 00/20] FDPIC ABI for ARM Christophe Lyon
2018-11-16 15:48 ` [ARM/FDPIC v4 01/20] [ARM] FDPIC: Add -mfdpic option support Christophe Lyon
2018-11-16 15:49 ` [ARM/FDPIC v4 02/20] [ARM] FDPIC: Handle arm*-*-uclinuxfdpiceabi in configure scripts Christophe Lyon
2018-11-16 15:49 ` [ARM/FDPIC v4 03/20] [ARM] FDPIC: Force FDPIC related options unless -mno-fdpic is provided Christophe Lyon
2018-11-16 15:49 ` [ARM/FDPIC v4 04/20] [ARM] FDPIC: Add support for FDPIC for arm architecture Christophe Lyon
2018-11-16 15:50 ` [ARM/FDPIC v4 07/20] [ARM] FDPIC: Avoid saving/restoring r9 on stack since it is read-only Christophe Lyon
2018-11-16 15:50 ` [ARM/FDPIC v4 05/20] [ARM] FDPIC: Fix __do_global_dtors_aux and frame_dummy generation Christophe Lyon
2018-11-16 15:50 ` [ARM/FDPIC v4 08/20] [ARM] FDPIC: Enforce local/global binding for function descriptors Christophe Lyon
2018-11-16 15:50 ` [ARM/FDPIC v4 06/20] [ARM] FDPIC: Add support for c++ exceptions Christophe Lyon
2018-11-16 15:51 ` [ARM/FDPIC v4 10/20] [ARM] FDPIC: Implement TLS support Christophe Lyon
2018-11-16 15:51 ` [ARM/FDPIC v4 09/20] [ARM] FDPIC: Add support for taking address of nested function Christophe Lyon
2018-11-16 15:52 ` [ARM/FDPIC v4 11/20] [ARM] FDPIC: Add support to unwind FDPIC signal frame Christophe Lyon
2018-11-16 15:52 ` [ARM/FDPIC v4 12/20] [ARM] FDPIC: Restore r9 after we call __aeabi_read_tp Christophe Lyon
2018-11-16 15:52 ` Christophe Lyon [this message]
2018-11-16 15:53 ` [ARM/FDPIC v4 14/20] [ARM][testsuite] FDPIC: Skip unsupported tests Christophe Lyon
2018-11-16 15:53 ` [ARM/FDPIC v4 15/20] [ARM][testsuite] FDPIC: Adjust scan-assembler patterns Christophe Lyon
2018-11-16 15:53 ` [ARM/FDPIC v4 16/20] [ARM][testsuite] FDPIC: Skip tests that don't work in PIC mode Christophe Lyon
2018-11-16 15:54 ` [ARM/FDPIC v4 18/20] [ARM][testsuite] FDPIC: Enable tests on pie_enabled targets Christophe Lyon
2018-11-16 15:54 ` [ARM/FDPIC v4 17/20] [ARM][testsuite] FDPIC: Handle *-*-uclinux* Christophe Lyon
2018-11-16 15:54 ` [ARM/FDPIC v4 19/20] [ARM][testsuite] FDPIC: Adjust pr43698.c to avoid clash with uclibc Christophe Lyon
2018-11-16 15:55 ` [ARM/FDPIC v4 20/20] [ARM][testsuite] FDPIC: Skip tests using architectures unsupported by FDPIC Christophe Lyon
2018-11-26 10:14 ` [ARM/FDPIC v4 00/20] FDPIC ABI for ARM Christophe Lyon
2018-12-03 9:19 ` Christophe Lyon
2018-12-11 10:27 ` Christophe Lyon
2019-01-02 11:44 ` Christophe Lyon
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