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Fix preemption and SMP problems in the FP emulator code.

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Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Ralf Baechle 2005-04-28 13:39:10 +00:00
parent 63b2d2f4d2
commit cd21dfcfbb
5 changed files with 120 additions and 117 deletions
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19
arch/mips/kernel/traps.c
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@ -551,6 +551,14 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
preempt_disable();
#ifdef CONFIG_PREEMPT
if (!is_fpu_owner()) {
/* We might lose fpu before disabling preempt... */
own_fpu();
BUG_ON(!used_math());
restore_fp(current);
}
#endif
/*
* Unimplemented operation exception. If we've got the full
* software emulator on-board, let's use it...
@ -562,11 +570,18 @@ asmlinkage void do_fpe(struct pt_regs *regs, unsigned long fcr31)
* a bit extreme for what should be an infrequent event.
*/
save_fp(current);
/* Ensure 'resume' not overwrite saved fp context again. */
lose_fpu();
preempt_enable();
/* Run the emulator */
sig = fpu_emulator_cop1Handler (0, regs,
&current->thread.fpu.soft);
preempt_disable();
own_fpu(); /* Using the FPU again. */
/*
* We can't allow the emulated instruction to leave any of
* the cause bit set in $fcr31.
@ -712,6 +727,8 @@ asmlinkage void do_cpu(struct pt_regs *regs)
set_used_math();
}
preempt_enable();
if (!cpu_has_fpu) {
int sig = fpu_emulator_cop1Handler(0, regs,
&current->thread.fpu.soft);
@ -719,8 +736,6 @@ asmlinkage void do_cpu(struct pt_regs *regs)
force_sig(sig, current);
}
preempt_enable();
return;
case 2: