tile: support kprobes on tilegx

This change includes support for Kprobes, Jprobes and Return Probes.

Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Tony Lu <zlu@tilera.com>
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/arch/tile/mm/fault.c b/arch/tile/mm/fault.c
index 502664ae1e6e..64eec3f9584f 100644
--- a/arch/tile/mm/fault.c
+++ b/arch/tile/mm/fault.c
@@ -34,6 +34,7 @@
 #include <linux/hugetlb.h>
 #include <linux/syscalls.h>
 #include <linux/uaccess.h>
+#include <linux/kdebug.h>
 
 #include <asm/pgalloc.h>
 #include <asm/sections.h>
@@ -721,6 +722,17 @@ void do_page_fault(struct pt_regs *regs, int fault_num,
 {
         int is_page_fault;
 
+#ifdef CONFIG_KPROBES
+        /*
+         * This is to notify the fault handler of the kprobes.  The
+         * exception code is redundant as it is also carried in REGS,
+         * but we pass it anyhow.
+         */
+        if (notify_die(DIE_PAGE_FAULT, "page fault", regs, -1,
+                       regs->faultnum, SIGSEGV) == NOTIFY_STOP)
+                return;
+#endif
+
 #ifdef __tilegx__
         /*
          * We don't need early do_page_fault_ics() support, since unlike