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| author | Jayachandran C <jchandra@broadcom.com> | 2013-06-10 06:30:01 +0000 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2013-06-13 17:46:41 +0200 |
| commit | 83bee792d7cb20d250be57e99d97f8cc83d9b4d5 (patch) | |
| tree | 4966fbdabeaae68ff9ca921ebc5bdd71072e383e /arch/mips/kernel | |
| parent | 2c952e06e4f57716109b609956eda28c900faac0 (diff) | |
| download | blackbird-op-linux-83bee792d7cb20d250be57e99d97f8cc83d9b4d5.tar.gz blackbird-op-linux-83bee792d7cb20d250be57e99d97f8cc83d9b4d5.zip | |
MIPS: Allow kernel to use coprocessor 2
Kernel threads should be able to use COP2 if the platform needs it.
Do not call die_if_kernel() for a coprocessor unusable exception if
the exception due to COP2 usage. Instead, the default notifier for
COP2 exceptions is updated to call die_if_kernel.
Signed-off-by: Jayachandran C <jchandra@broadcom.com>
Cc: linux-mips@linux-mips.org
Cc: ddaney.cavm@gmail.com
Patchwork: https://patchwork.linux-mips.org/patch/5415/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel')
| -rw-r--r-- | arch/mips/kernel/traps.c | 15 |
1 files changed, 5 insertions, 10 deletions
diff --git a/arch/mips/kernel/traps.c b/arch/mips/kernel/traps.c index beba1e616b6e..142d2bede024 100644 --- a/arch/mips/kernel/traps.c +++ b/arch/mips/kernel/traps.c @@ -1056,15 +1056,9 @@ static int default_cu2_call(struct notifier_block *nfb, unsigned long action, { struct pt_regs *regs = data; - switch (action) { - default: - die_if_kernel("Unhandled kernel unaligned access or invalid " + die_if_kernel("COP2: Unhandled kernel unaligned access or invalid " "instruction", regs); - /* Fall through */ - - case CU2_EXCEPTION: - force_sig(SIGILL, current); - } + force_sig(SIGILL, current); return NOTIFY_OK; } @@ -1080,10 +1074,11 @@ asmlinkage void do_cpu(struct pt_regs *regs) unsigned long __maybe_unused flags; prev_state = exception_enter(); - die_if_kernel("do_cpu invoked from kernel context!", regs); - cpid = (regs->cp0_cause >> CAUSEB_CE) & 3; + if (cpid != 2) + die_if_kernel("do_cpu invoked from kernel context!", regs); + switch (cpid) { case 0: epc = (unsigned int __user *)exception_epc(regs); |
