sh: Add die chain notifiers.

Add the atomic die chains in, kprobes needs these.

Signed-off-by: Paul Mundt <lethal@linux-sh.org>

2 files changed, 38 insertions, 0 deletions

diff --git a/include/asm-sh/kdebug.h b/include/asm-sh/kdebug.h
new file mode 100644
index 0000000..ef009ba
--- /dev/null
+++ b/include/asm-sh/kdebug.h
@@ -0,0 +1,35 @@
+#ifndef __ASM_SH_KDEBUG_H
+#define __ASM_SH_KDEBUG_H
+
+#include <linux/notifier.h>
+
+struct pt_regs;
+
+struct die_args {
+	struct pt_regs *regs;
+	int trapnr;
+};
+
+int register_die_notifier(struct notifier_block *nb);
+int unregister_die_notifier(struct notifier_block *nb);
+int register_page_fault_notifier(struct notifier_block *nb);
+int unregister_page_fault_notifier(struct notifier_block *nb);
+extern struct atomic_notifier_head shdie_chain;
+
+/* Grossly misnamed. */
+enum die_val {
+	DIE_TRAP,
+	DIE_PAGE_FAULT,
+};
+
+static inline int notify_die(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(&shdie_chain, val, &args);
+}
+#endif /* __ASM_SH_KDEBUG_H */
diff --git a/include/asm-sh/system.h b/include/asm-sh/system.h
index 4a6a19f..127af30 100644
--- a/include/asm-sh/system.h
+++ b/include/asm-sh/system.h
@@ -9,6 +9,7 @@
 #include <linux/irqflags.h>
 #include <linux/compiler.h>
 #include <asm/types.h>
+#include <asm/ptrace.h>
 
 /*
  *	switch_to() should switch tasks to task nr n, first
@@ -255,6 +256,8 @@ static inline unsigned long __cmpxchg(volatile void * ptr, unsigned long old,
 				    (unsigned long)_n_, sizeof(*(ptr))); \
   })
 
+extern void die(const char *str, struct pt_regs *regs, long err) __attribute__ ((noreturn));
+
 extern void *set_exception_table_vec(unsigned int vec, void *handler);
 
 static inline void *set_exception_table_evt(unsigned int evt, void *handler)