ARM kprobes: add the kprobes hook to the page fault handler
Signed-off-by: Nicolas Pitre <nico@marvell.com>
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c
index a8a7dab..1e7b1ed 100644
--- a/arch/arm/mm/fault.c
+++ b/arch/arm/mm/fault.c
@@ -12,6 +12,7 @@
#include <linux/signal.h>
#include <linux/mm.h>
#include <linux/init.h>
+#include <linux/kprobes.h>
#include <asm/system.h>
#include <asm/pgtable.h>
@@ -20,6 +21,29 @@
#include "fault.h"
+
+#ifdef CONFIG_KPROBES
+static inline int notify_page_fault(struct pt_regs *regs, unsigned int fsr)
+{
+ int ret = 0;
+
+ if (!user_mode(regs)) {
+ /* kprobe_running() needs smp_processor_id() */
+ preempt_disable();
+ if (kprobe_running() && kprobe_fault_handler(regs, fsr))
+ ret = 1;
+ preempt_enable();
+ }
+
+ return ret;
+}
+#else
+static inline int notify_page_fault(struct pt_regs *regs, unsigned int fsr)
+{
+ return 0;
+}
+#endif
+
/*
* This is useful to dump out the page tables associated with
* 'addr' in mm 'mm'.
@@ -222,6 +246,9 @@
struct mm_struct *mm;
int fault, sig, code;
+ if (notify_page_fault(regs, fsr))
+ return 0;
+
tsk = current;
mm = tsk->mm;
