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author | Paul Burton <paul.burton@imgtec.com> | 2016-11-07 15:07:02 (GMT) |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-03-12 05:41:40 (GMT) |
commit | d0eae5bbd1c3361659c3c0e349c14123f0aaba81 (patch) | |
tree | fe3daeaa15418b1ce4204292262feba7768b6bb0 /arch/mips/loongson64 | |
parent | 3660e62cfce7a1db86fe330dadb92db59d0bc039 (diff) | |
download | linux-d0eae5bbd1c3361659c3c0e349c14123f0aaba81.tar.xz |
MIPS: Clear ISA bit correctly in get_frame_info()
commit ccaf7caf2c73c6db920772bf08bf1d47b2170634 upstream.
get_frame_info() can be called in microMIPS kernels with the ISA bit
already clear. For example this happens when unwind_stack_by_address()
is called because we begin with a PC that has the ISA bit set & subtract
the (odd) offset from the preceding symbol (which does not have the ISA
bit set). Since get_frame_info() unconditionally subtracts 1 from the PC
in microMIPS kernels it incorrectly misaligns the address it then
attempts to access code at, leading to an address error exception.
Fix this by using msk_isa16_mode() to clear the ISA bit, which allows
get_frame_info() to function regardless of whether it is provided with a
PC that has the ISA bit set or not.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Fixes: 34c2f668d0f6 ("MIPS: microMIPS: Add unaligned access support.")
Cc: Leonid Yegoshin <leonid.yegoshin@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14528/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/mips/loongson64')
0 files changed, 0 insertions, 0 deletions