diff options
| -rw-r--r-- | arch/mips/kernel/traps.c | 21 |
1 files changed, 18 insertions, 3 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index da0c29422cf..cf7ac5483f5 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -1025,6 +1025,24 @@ asmlinkage void do_cpu(struct pt_regs *regs) return; + case 3: + /* + * Old (MIPS I and MIPS II) processors will set this code + * for COP1X opcode instructions that replaced the original + * COP3 space. We don't limit COP1 space instructions in + * the emulator according to the CPU ISA, so we want to + * treat COP1X instructions consistently regardless of which + * code the CPU chose. Therefore we redirect this trap to + * the FP emulator too. + * + * Then some newer FPU-less processors use this code + * erroneously too, so they are covered by this choice + * as well. + */ + if (raw_cpu_has_fpu) + break; + /* Fall through. */ + case 1: if (used_math()) /* Using the FPU again. */ own_fpu(1); @@ -1048,9 +1066,6 @@ asmlinkage void do_cpu(struct pt_regs *regs) case 2: raw_notifier_call_chain(&cu2_chain, CU2_EXCEPTION, regs); return; - - case 3: - break; } force_sig(SIGILL, current); |