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>
diff --git a/arch/tile/mm/fault.c b/arch/tile/mm/fault.c
index 502664a..64eec3f 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 @@
{
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