MIPS: kprobe: Add support.

This patch is based on previous work by Sony and Himanshu Chauhan.

I have done some cleanup and implemented JProbes and KRETPROBES.  The
KRETPROBES part is pretty much copied verbatim from powerpc.  A possible
future enhance might be to factor out the common code.

Signed-off-by: David Daney <ddaney@caviumnetworks.com>
Cc: Himanshu Chauhan <hschauhan@nulltrace.org>
To: linux-mips@linux-mips.org
To: ananth@in.ibm.com,
To: anil.s.keshavamurthy@intel.com
To: davem@davemloft.net
To: masami.hiramatsu.pt@hitachi.com
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/1525/
Patchwork: https://patchwork.linux-mips.org/patch/1530/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/include/asm/break.h b/arch/mips/include/asm/break.h
index 44437ed..9161e68 100644
--- a/arch/mips/include/asm/break.h
+++ b/arch/mips/include/asm/break.h
@@ -30,6 +30,8 @@
 #define BRK_BUG		512	/* Used by BUG() */
 #define BRK_KDB		513	/* Used in KDB_ENTER() */
 #define BRK_MEMU	514	/* Used by FPU emulator */
+#define BRK_KPROBE_BP	515	/* Kprobe break */
+#define BRK_KPROBE_SSTEPBP 516	/* Kprobe single step software implementation */
 #define BRK_MULOVF	1023	/* Multiply overflow */
 
 #endif /* __ASM_BREAK_H */