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powerpc: Hook in new transactional memory code

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This hooks the new transactional memory code into context switching, FP/VMX/VMX
unavailable and exception return.

Signed-off-by: Matt Evans <matt@ozlabs.org>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Michael Neuling
2013-02-13 16:21:40 +00:00
committed by Benjamin Herrenschmidt
parent f54db641b9
commit bc2a9408fa
4 changed files with 115 additions and 4 deletions
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32
arch/powerpc/kernel/traps.c
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@@ -1029,6 +1029,38 @@ void __kprobes program_check_exception(struct pt_regs *regs)
_exception(SIGTRAP, regs, TRAP_BRKPT, regs->nip);
return;
}
#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
if (reason & REASON_TM) {
/* This is a TM "Bad Thing Exception" program check.
* This occurs when:
* - An rfid/hrfid/mtmsrd attempts to cause an illegal
* transition in TM states.
* - A trechkpt is attempted when transactional.
* - A treclaim is attempted when non transactional.
* - A tend is illegally attempted.
* - writing a TM SPR when transactional.
*/
if (!user_mode(regs) &&
report_bug(regs->nip, regs) == BUG_TRAP_TYPE_WARN) {
regs->nip += 4;
return;
}
/* If usermode caused this, it's done something illegal and
* gets a SIGILL slap on the wrist. We call it an illegal
* operand to distinguish from the instruction just being bad
* (e.g. executing a 'tend' on a CPU without TM!); it's an
* illegal /placement/ of a valid instruction.
*/
if (user_mode(regs)) {
_exception(SIGILL, regs, ILL_ILLOPN, regs->nip);
return;
} else {
printk(KERN_EMERG "Unexpected TM Bad Thing exception "
"at %lx (msr 0x%x)\n", regs->nip, reason);
die("Unrecoverable exception", regs, SIGABRT);
}
}
#endif
/* We restore the interrupt state now */
if (!arch_irq_disabled_regs(regs))