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| author | Nicolas Pitre <nico@cam.org> | 2007-12-03 23:21:57 +0300 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-01-26 18:25:16 +0300 |
| commit | 25ce1dd71b8326f2542cf030f68e0e64c3d94dc1 (patch) | |
| tree | d2b63f16f2585094e0fb77378c1c7768ba06b7f4 /arch/arm/mm/fault.c | |
| parent | 24ba613c9d6cad315f484e658288db152f1dc447 (diff) | |
| download | linux-25ce1dd71b8326f2542cf030f68e0e64c3d94dc1.tar.xz | |
ARM kprobes: add the kprobes hook to the page fault handler
Signed-off-by: Nicolas Pitre <nico@marvell.com>
Diffstat (limited to 'arch/arm/mm/fault.c')
| -rw-r--r-- | arch/arm/mm/fault.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/arm/mm/fault.c b/arch/arm/mm/fault.c index a8a7dab757eb..1e7b1ed304d8 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 @@ do_page_fault(unsigned long addr, unsigned int fsr, struct pt_regs *regs) struct mm_struct *mm; int fault, sig, code; + if (notify_page_fault(regs, fsr)) + return 0; + tsk = current; mm = tsk->mm; |