Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/sfrench/cifs-2.6

[linux-2.6-omap-h63xx.git] / arch / powerpc / kernel / process.c

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 219f3634115e46a05d0c1426d115aa95d58fef48..957bded0020d5d8921e11f6db8fc4517565207a8 100644 (file)
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -47,6 +47,8 @@
 #ifdef CONFIG_PPC64
 #include <asm/firmware.h>
 #endif
+#include <linux/kprobes.h>
+#include <linux/kdebug.h>
 
 extern unsigned long _get_SP(void);
 
@@ -239,21 +241,53 @@ void discard_lazy_cpu_state(void)
 }
 #endif /* CONFIG_SMP */
 
+void do_dabr(struct pt_regs *regs, unsigned long address,
+                   unsigned long error_code)
+{
+       siginfo_t info;
+
+       if (notify_die(DIE_DABR_MATCH, "dabr_match", regs, error_code,
+                       11, SIGSEGV) == NOTIFY_STOP)
+               return;
+
+       if (debugger_dabr_match(regs))
+               return;
+
+       /* Clear the DAC and struct entries.  One shot trigger */
+#if defined(CONFIG_BOOKE)
+       mtspr(SPRN_DBCR0, mfspr(SPRN_DBCR0) & ~(DBSR_DAC1R | DBSR_DAC1W
+                                                       | DBCR0_IDM));
+#endif
+
+       /* Clear the DABR */
+       set_dabr(0);
+
+       /* Deliver the signal to userspace */
+       info.si_signo = SIGTRAP;
+       info.si_errno = 0;
+       info.si_code = TRAP_HWBKPT;
+       info.si_addr = (void __user *)address;
+       force_sig_info(SIGTRAP, &info, current);
+}
+
 static DEFINE_PER_CPU(unsigned long, current_dabr);
 
 int set_dabr(unsigned long dabr)
 {
        __get_cpu_var(current_dabr) = dabr;
 
-#ifdef CONFIG_PPC_MERGE                /* XXX for now */
        if (ppc_md.set_dabr)
                return ppc_md.set_dabr(dabr);
-#endif
 
        /* XXX should we have a CPU_FTR_HAS_DABR ? */
 #if defined(CONFIG_PPC64) || defined(CONFIG_6xx)
        mtspr(SPRN_DABR, dabr);
 #endif
+
+#if defined(CONFIG_BOOKE)
+       mtspr(SPRN_DAC1, dabr);
+#endif
+
        return 0;
 }
 
@@ -337,6 +371,12 @@ struct task_struct *__switch_to(struct task_struct *prev,
        if (unlikely(__get_cpu_var(current_dabr) != new->thread.dabr))
                set_dabr(new->thread.dabr);
 
+#if defined(CONFIG_BOOKE)
+       /* If new thread DAC (HW breakpoint) is the same then leave it */
+       if (new->thread.dabr)
+               set_dabr(new->thread.dabr);
+#endif
+
        new_thread = &new->thread;
        old_thread = &current->thread;
 
@@ -525,6 +565,10 @@ void flush_thread(void)
        if (current->thread.dabr) {
                current->thread.dabr = 0;
                set_dabr(0);
+
+#if defined(CONFIG_BOOKE)
+               current->thread.dbcr0 &= ~(DBSR_DAC1R | DBSR_DAC1W);
+#endif
        }
 }