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ARM kprobes: add the kprobes hook to the page fault handler

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Signed-off-by: Nicolas Pitre <nico@marvell.com>
This commit is contained in:
Nicolas Pitre 2007-12-03 15:21:57 -05:00 • committed by Russell King
parent 24ba613c9d
commit 25ce1dd71b
1 changed files with 27 additions and 0 deletions
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27
arch/arm/mm/fault.c
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@ -12,6 +12,7 @@
#include <linux/signal.h> #include <linux/signal.h>
#include <linux/mm.h> #include <linux/mm.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/kprobes.h>
#include <asm/system.h> #include <asm/system.h>
#include <asm/pgtable.h> #include <asm/pgtable.h>
@ -20,6 +21,29 @@
#include "fault.h" #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 * This is useful to dump out the page tables associated with
* 'addr' in mm 'mm'. * 'addr' in mm 'mm'.
@ -222,6 +246,9 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs)
struct mm_struct *mm; struct mm_struct *mm;
int fault, sig, code; int fault, sig, code;
if (notify_page_fault(regs, fsr))
return 0;
tsk = current; tsk = current;
mm = tsk->mm; mm = tsk->mm;