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| author |   Markos Chandras <markos.chandras@imgtec.com> | 2015-06-24 09:52:01 +0100 |
|---|---|---|
| committer |   Ralf Baechle <ralf@linux-mips.org> | 2015-07-09 11:11:43 +0200 |
| commit | 143fefc8f315cd10e046e6860913c421c3385cb1 (patch) | |
| tree | 4bc0ebed3888fd6cb66b04bdccf2d0e2dc178593 /arch | |
| parent | MIPS: Fix branch emulation for BLTC and BGEC instructions (diff) | |
| download | linux-dev-143fefc8f315cd10e046e6860913c421c3385cb1.tar.xz linux-dev-143fefc8f315cd10e046e6860913c421c3385cb1.zip | |
MIPS: Fix erroneous JR emulation for MIPS R6
Commit 5f9f41c474befb4ebbc40b27f65bb7d649241581 ("MIPS: kernel: Prepare
the JR instruction for emulation on MIPS R6") added support for
emulating the JR instruction on MIPS R6 cores but that introduced a bug
which could be triggered when hitting a JALR opcode because the code used
the wrong field in the 'r_format' struct to determine the instruction
opcode. This lead to crashes because an emulated JALR instruction was
treated as a JR one when the R6 emulator was turned off.
Fixes: 5f9f41c474be ("MIPS: kernel: Prepare the JR instruction for emulation on MIPS R6")
Cc: <stable@vger.kernel.org> # 4.0+
Signed-off-by: Markos Chandras <markos.chandras@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: stable@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/10583/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/mips/math-emu/cp1emu.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/mips/math-emu/cp1emu.c b/arch/mips/math-emu/cp1emu.c index 00c241ae04ce..712f17a2ecf2 100644 --- a/arch/mips/math-emu/cp1emu.c +++ b/arch/mips/math-emu/cp1emu.c @@ -451,7 +451,7 @@ static int isBranchInstr(struct pt_regs *regs, struct mm_decoded_insn dec_insn, /* Fall through */ case jr_op: /* For R6, JR already emulated in jalr_op */ - if (NO_R6EMU && insn.r_format.opcode == jr_op) + if (NO_R6EMU && insn.r_format.func == jr_op) break; *contpc = regs->regs[insn.r_format.rs]; return 1; |