diff options
| author | Paul Burton <paul.burton@imgtec.com> | 2016-04-21 14:04:55 +0100 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2016-06-06 19:11:04 -0400 |
| commit | de66b0f01581ae7780938e439e87b4c446106b3d (patch) | |
| tree | ebdd97fe9e070ce19b5e62ae881fab1587550c7d /kernel | |
| parent | 9365bd6c134cf5d4cac668bb44ab06bf816bc23d (diff) | |
MIPS: math-emu: Fix jalr emulation when rd == $0
[ Upstream commit ab4a92e66741b35ca12f8497896bafbe579c28a1 ]
When emulating a jalr instruction with rd == $0, the code in
isBranchInstr was incorrectly writing to GPR $0 which should actually
always remain zeroed. This would lead to any further instructions
emulated which use $0 operating on a bogus value until the task is next
context switched, at which point the value of $0 in the task context
would be restored to the correct zero by a store in SAVE_SOME. Fix this
by not writing to rd if it is $0.
Fixes: 102cedc32a6e ("MIPS: microMIPS: Floating point support.")
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: Maciej W. Rozycki <macro@imgtec.com>
Cc: James Hogan <james.hogan@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Cc: stable <stable@vger.kernel.org> # v3.10
Patchwork: https://patchwork.linux-mips.org/patch/13160/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions