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| author | Paul Burton <paul.burton@imgtec.com> | 2017-06-02 18:35:01 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-06-24 05:11:17 (GMT) |
| commit | 6b706cbb16e9e794a2a37e57ae4951b8232270b4 (patch) | |
| tree | 98f982c65606eb394535f57273397695db593b88 /arch/openrisc | |
| parent | 22921a9e232a1187873c0127d408767b6bdc558e (diff) | |
| download | linux-6b706cbb16e9e794a2a37e57ae4951b8232270b4.tar.xz | |
MIPS: Fix bnezc/jialc return address calculation
commit 1a73d9310e093fc3adffba4d0a67b9fab2ee3f63 upstream.
The code handling the pop76 opcode (ie. bnezc & jialc instructions) in
__compute_return_epc_for_insn() needs to set the value of $31 in the
jialc case, which is encoded with rs = 0. However its check to
differentiate bnezc (rs != 0) from jialc (rs = 0) was unfortunately
backwards, meaning that if we emulate a bnezc instruction we clobber $31
& if we emulate a jialc instruction it actually behaves like a jic
instruction.
Fix this by inverting the check of rs to match the way the instructions
are actually encoded.
Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Fixes: 28d6f93d201d ("MIPS: Emulate the new MIPS R6 BNEZC and JIALC instructions")
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/16178/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/openrisc')
0 files changed, 0 insertions, 0 deletions