From 41c594ab65fc89573af296d192aa5235d09717ab Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Wed, 5 Apr 2006 09:45:45 +0100 Subject: [MIPS] MT: Improved multithreading support. Signed-off-by: Ralf Baechle --- arch/mips/kernel/ptrace.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'arch/mips/kernel/ptrace.c') diff --git a/arch/mips/kernel/ptrace.c b/arch/mips/kernel/ptrace.c index f838b36cc76..f3106d0771b 100644 --- a/arch/mips/kernel/ptrace.c +++ b/arch/mips/kernel/ptrace.c @@ -248,10 +248,20 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) break; case FPC_EIR: { /* implementation / version register */ unsigned int flags; +#ifdef CONFIG_MIPS_MT_SMTC + unsigned int irqflags; + unsigned int mtflags; +#endif /* CONFIG_MIPS_MT_SMTC */ if (!cpu_has_fpu) break; +#ifdef CONFIG_MIPS_MT_SMTC + /* Read-modify-write of Status must be atomic */ + local_irq_save(irqflags); + mtflags = dmt(); +#endif /* CONFIG_MIPS_MT_SMTC */ + preempt_disable(); if (cpu_has_mipsmt) { unsigned int vpflags = dvpe(); @@ -266,6 +276,10 @@ long arch_ptrace(struct task_struct *child, long request, long addr, long data) __asm__ __volatile__("cfc1\t%0,$0": "=r" (tmp)); write_c0_status(flags); } +#ifdef CONFIG_MIPS_MT_SMTC + emt(mtflags); + local_irq_restore(irqflags); +#endif /* CONFIG_MIPS_MT_SMTC */ preempt_enable(); break; } -- cgit v1.2.3