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-rw-r--r--arch/sparc64/mm/fault.c36
1 files changed, 35 insertions, 1 deletions
diff --git a/arch/sparc64/mm/fault.c b/arch/sparc64/mm/fault.c
index 6e002aacb96..1605967cce9 100644
--- a/arch/sparc64/mm/fault.c
+++ b/arch/sparc64/mm/fault.c
@@ -31,6 +31,40 @@
31#include <asm/kdebug.h> 31#include <asm/kdebug.h>
32#include <asm/mmu_context.h> 32#include <asm/mmu_context.h>
33 33
34#ifdef CONFIG_KPROBES
35ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
36
37/* Hook to register for page fault notifications */
38int register_page_fault_notifier(struct notifier_block *nb)
39{
40 return atomic_notifier_chain_register(&notify_page_fault_chain, nb);
41}
42
43int unregister_page_fault_notifier(struct notifier_block *nb)
44{
45 return atomic_notifier_chain_unregister(&notify_page_fault_chain, nb);
46}
47
48static inline int notify_page_fault(enum die_val val, const char *str,
49 struct pt_regs *regs, long err, int trap, int sig)
50{
51 struct die_args args = {
52 .regs = regs,
53 .str = str,
54 .err = err,
55 .trapnr = trap,
56 .signr = sig
57 };
58 return atomic_notifier_call_chain(&notify_page_fault_chain, val, &args);
59}
60#else
61static inline int notify_page_fault(enum die_val val, const char *str,
62 struct pt_regs *regs, long err, int trap, int sig)
63{
64 return NOTIFY_DONE;
65}
66#endif
67
34/* 68/*
35 * To debug kernel to catch accesses to certain virtual/physical addresses. 69 * To debug kernel to catch accesses to certain virtual/physical addresses.
36 * Mode = 0 selects physical watchpoints, mode = 1 selects virtual watchpoints. 70 * Mode = 0 selects physical watchpoints, mode = 1 selects virtual watchpoints.
@@ -263,7 +297,7 @@ asmlinkage void __kprobes do_sparc64_fault(struct pt_regs *regs)
263 297
264 fault_code = get_thread_fault_code(); 298 fault_code = get_thread_fault_code();
265 299
266 if (notify_die(DIE_PAGE_FAULT, "page_fault", regs, 300 if (notify_page_fault(DIE_PAGE_FAULT, "page_fault", regs,
267 fault_code, 0, SIGSEGV) == NOTIFY_STOP) 301 fault_code, 0, SIGSEGV) == NOTIFY_STOP)
268 return; 302 return;
269 303