MIPS: Fix erroneous JR emulation for MIPS R6
authorMarkos Chandras <markos.chandras@imgtec.com>
Wed, 24 Jun 2015 08:52:01 +0000 (09:52 +0100)
committerRalf Baechle <ralf@linux-mips.org>
Thu, 9 Jul 2015 09:11:43 +0000 (11:11 +0200)
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>
arch/mips/math-emu/cp1emu.c

index 00c241a..712f17a 100644 (file)
@@ -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;