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authorRalf Baechle <ralf@linux-mips.org>2006-04-05 09:45:45 +0100
committerRalf Baechle <ralf@linux-mips.org>2006-04-19 04:14:28 +0200
commit41c594ab65fc89573af296d192aa5235d09717ab (patch)
tree562462512a320f386bdf49eabfbb26bb3ee761fa /arch/mips/kernel/ptrace.c
parent2600990e640e3bef29ed89d565864cf16ee83833 (diff)
[MIPS] MT: Improved multithreading support.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/ptrace.c')
-rw-r--r--arch/mips/kernel/ptrace.c14
1 files changed, 14 insertions, 0 deletions
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;
}