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27 March 2024, 02:37:15 UTC
Revision e9d92d223381f1f3be5d87322b576721d3b93612 authored by Markos Chandras on 24 June 2015, 08:52:00 UTC, committed by Ralf Baechle on 09 July 2015, 09:10:40 UTC 
MIPS: Fix branch emulation for BLTC and BGEC instructions
 
Commits f1b44067c19258b7614e3cd09dfe8d8e12ff5895 ("MIPS: Emulate the
new MIPS R6 B{L,G}T{Z,}{AL,}C instructions") and commit
a8ff66f52d3f17b5ae793955270675c197f73d6c ("MIPS: Emulate the new MIPS
R6 B{L,G}E{Z,}{AL,}C instructions") added support for emulating various
branch compact instructions. However, it missed the case for those which
use the old BLEZL and BGTZL opcodes leading to random crashes when the R6
emulator is disabled. We fix this by ensuring that the 'rt' field is not
zero which is always true for these branch compact instructions.

Fixes: f1b44067c192 ("MIPS: Emulate the new MIPS R6 B{L,G}T{Z,}{AL,}C instructions")
Fixes: a8ff66f52d3f ("MIPS: Emulate the new MIPS R6 B{L,G}E{Z,}{AL,}C instructions")
Cc: <stable@vger.kernel.org> # 4.0+
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Markos Chandras <markos.chandras@imgtec.com>
Patchwork: https://patchwork.linux-mips.org/patch/10582/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
1 parent 761b449
History
Tip revision: e9d92d223381f1f3be5d87322b576721d3b93612 authored by Markos Chandras on 24 June 2015, 08:52:00 UTC
MIPS: Fix branch emulation for BLTC and BGEC instructions
Tip revision: e9d92d2
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