diff options
author | Paul Burton <paul.burton@imgtec.com> | 2016-11-07 18:07:02 +0300 |
---|---|---|
committer | Jiri Slaby <jslaby@suse.cz> | 2017-03-13 23:40:16 +0300 |
commit | 839f081610437d03b101286d8d386006044ab816 (patch) | |
tree | 224e14f375afa282c7de74c2f0b3b1c59f1e1073 /virt | |
parent | 6f25f217710b484b7eea2ea1a3e9f1c00e44f496 (diff) | |
download | linux-839f081610437d03b101286d8d386006044ab816.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: Jiri Slaby <jslaby@suse.cz>
Diffstat (limited to 'virt')
0 files changed, 0 insertions, 0 deletions