MIPS: Correct MIPS16 BREAK code interpretation

Correct the interpretation of the immediate MIPS16 BREAK instruction
code embedded in the instruction word across bits 10:5 rather than 11:6
as current code implies, fixing the interpretation of integer overflow
and divide by zero traps.

Signed-off-by: Maciej W. Rozycki <macro@linux-mips.org>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/9695/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/traps.c

@@ -925,7 +925,7 @@ asmlinkage void do_bp(struct pt_regs *regs)
 			if (__get_user(instr[0],
 				       (u16 __user *)msk_isa16_mode(epc)))
 				goto out_sigsegv;
-			bcode = (instr[0] >> 6) & 0x3f;
+			bcode = (instr[0] >> 5) & 0x3f;
 			do_trap_or_bp(regs, bcode, "Break");
 			goto out;
 		}