X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=arch%2Fsh%2Fmm%2Ffault.c;h=9207da67ff8a669841170bc73b600f9782d3037d;hb=d84c4124c4b6611301b402e8611b7e36de3bd351;hp=fa5d7f0b9f1877a5b8bccedc71d97ce84d660a22;hpb=db2e1fa3f0eefbbe04e90d6e4d290ee176b28248;p=powerpc.git

diff --git a/arch/sh/mm/fault.c b/arch/sh/mm/fault.c
index fa5d7f0b9f..9207da67ff 100644
--- a/arch/sh/mm/fault.c
+++ b/arch/sh/mm/fault.c
@@ -2,7 +2,7 @@
  * Page fault handler for SH with an MMU.
  *
  *  Copyright (C) 1999  Niibe Yutaka
- *  Copyright (C) 2003  Paul Mundt
+ *  Copyright (C) 2003 - 2007  Paul Mundt
  *
  *  Based on linux/arch/i386/mm/fault.c:
  *   Copyright (C) 1995  Linus Torvalds
@@ -15,12 +15,42 @@
 #include <linux/mm.h>
 #include <linux/hardirq.h>
 #include <linux/kprobes.h>
+#include <linux/kdebug.h>
 #include <asm/system.h>
 #include <asm/mmu_context.h>
 #include <asm/tlbflush.h>
 #include <asm/kgdb.h>
 
-extern void die(const char *,struct pt_regs *,long);
+#ifdef CONFIG_KPROBES
+ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
+
+/* Hook to register for page fault notifications */
+int register_page_fault_notifier(struct notifier_block *nb)
+{
+	return atomic_notifier_chain_register(&notify_page_fault_chain, nb);
+}
+
+int unregister_page_fault_notifier(struct notifier_block *nb)
+{
+	return atomic_notifier_chain_unregister(&notify_page_fault_chain, nb);
+}
+
+static inline int notify_page_fault(enum die_val val, struct pt_regs *regs,
+				    int trap, int sig)
+{
+	struct die_args args = {
+		.regs = regs,
+		.trapnr = trap,
+	};
+	return atomic_notifier_call_chain(&notify_page_fault_chain, val, &args);
+}
+#else
+static inline int notify_page_fault(enum die_val val, struct pt_regs *regs,
+				    int trap, int sig)
+{
+	return NOTIFY_DONE;
+}
+#endif
 
 /*
  * This routine handles page faults.  It determines the address,
@@ -39,6 +69,11 @@ asmlinkage void __kprobes do_page_fault(struct pt_regs *regs,
 	siginfo_t info;
 
 	trace_hardirqs_on();
+
+	if (notify_page_fault(DIE_PAGE_FAULT, regs,
+			      writeaccess, SIGSEGV) == NOTIFY_STOP)
+		return;
+
 	local_irq_enable();
 
 #ifdef CONFIG_SH_KGDB