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-rw-r--r--arch/avr32/kernel/kprobes.c7
-rw-r--r--arch/avr32/mm/fault.c36
-rw-r--r--include/asm-avr32/kdebug.h17
-rw-r--r--include/asm-avr32/kprobes.h1
4 files changed, 27 insertions, 34 deletions
diff --git a/arch/avr32/kernel/kprobes.c b/arch/avr32/kernel/kprobes.c
index 004c94b..4942ee6 100644
--- a/arch/avr32/kernel/kprobes.c
+++ b/arch/avr32/kernel/kprobes.c
@@ -179,7 +179,7 @@ static int __kprobes post_kprobe_handler(struct pt_regs *regs)
return 1;
}
-static int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
+int __kprobes kprobe_fault_handler(struct pt_regs *regs, int trapnr)
{
struct kprobe *cur = kprobe_running();
@@ -216,11 +216,6 @@ int __kprobes kprobe_exceptions_notify(struct notifier_block *self,
if (post_kprobe_handler(args->regs))
ret = NOTIFY_STOP;
break;
- case DIE_FAULT:
- if (kprobe_running()
- && kprobe_fault_handler(args->regs, args->trapnr))
- ret = NOTIFY_STOP;
- break;
default:
break;
}
diff --git a/arch/avr32/mm/fault.c b/arch/avr32/mm/fault.c
index 88b00b1..e011f1c 100644
--- a/arch/avr32/mm/fault.c
+++ b/arch/avr32/mm/fault.c
@@ -12,41 +12,30 @@
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/pagemap.h>
-
#include <linux/kdebug.h>
+#include <linux/kprobes.h>
+
#include <asm/mmu_context.h>
#include <asm/sysreg.h>
#include <asm/tlb.h>
#include <asm/uaccess.h>
#ifdef CONFIG_KPROBES
-ATOMIC_NOTIFIER_HEAD(notify_page_fault_chain);
-
-/* Hook to register for page fault notifications */
-int register_page_fault_notifier(struct notifier_block *nb)
+static inline int notify_page_fault(struct pt_regs *regs, int trap)
{
- return atomic_notifier_chain_register(&notify_page_fault_chain, nb);
-}
+ int ret = 0;
-int unregister_page_fault_notifier(struct notifier_block *nb)
-{
- return atomic_notifier_chain_unregister(&notify_page_fault_chain, nb);
-}
+ if (!user_mode(regs)) {
+ if (kprobe_running() && kprobe_fault_handler(regs, trap))
+ ret = 1;
+ }
-static inline int notify_page_fault(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(&notify_page_fault_chain, val, &args);
+ return ret;
}
#else
-static inline int notify_page_fault(enum die_val val, struct pt_regs *regs,
- int trap, int sig)
+static inline int notify_page_fault(struct pt_regs *regs, int trap)
{
- return NOTIFY_DONE;
+ return 0;
}
#endif
@@ -76,8 +65,7 @@ asmlinkage void do_page_fault(unsigned long ecr, struct pt_regs *regs)
long signr;
int code;
- if (notify_page_fault(DIE_PAGE_FAULT, regs,
- ecr, SIGSEGV) == NOTIFY_STOP)
+ if (notify_page_fault(regs, ecr))
return;
address = sysreg_read(TLBEAR);
diff --git a/include/asm-avr32/kdebug.h b/include/asm-avr32/kdebug.h
index de41927..7f54e2b 100644
--- a/include/asm-avr32/kdebug.h
+++ b/include/asm-avr32/kdebug.h
@@ -5,13 +5,22 @@
/* Grossly misnamed. */
enum die_val {
- DIE_FAULT,
DIE_BREAKPOINT,
DIE_SSTEP,
- DIE_PAGE_FAULT,
};
-int register_page_fault_notifier(struct notifier_block *nb);
-int unregister_page_fault_notifier(struct notifier_block *nb);
+/*
+ * These are only here because kprobes.c wants them to implement a
+ * blatant layering violation. Will hopefully go away soon once all
+ * architectures are updated.
+ */
+static inline int register_page_fault_notifier(struct notifier_block *nb)
+{
+ return 0;
+}
+static inline int unregister_page_fault_notifier(struct notifier_block *nb)
+{
+ return 0;
+}
#endif /* __ASM_AVR32_KDEBUG_H */
diff --git a/include/asm-avr32/kprobes.h b/include/asm-avr32/kprobes.h
index 09a5cbe..190a637 100644
--- a/include/asm-avr32/kprobes.h
+++ b/include/asm-avr32/kprobes.h
@@ -26,6 +26,7 @@ struct arch_specific_insn {
kprobe_opcode_t insn[MAX_INSN_SIZE];
};
+extern int kprobe_fault_handler(struct pt_regs *regs, int trapnr);
extern int kprobe_exceptions_notify(struct notifier_block *self,
unsigned long val, void *data);
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