MIPS: kprobes: Define regs_return_value()

Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com>
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,
Cc: hschauhan@nulltrace.org
Patchwork: https://patchwork.linux-mips.org/patch/1529/Signed-off-by: NRalf Baechle <ralf@linux-mips.org>

arch/mips/include/asm/ptrace.h

@@ -137,6 +137,7 @@ extern int ptrace_set_watch_regs(struct task_struct *child,
  */
 #define user_mode(regs) (((regs)->cp0_status & KU_MASK) == KU_USER)
 
+#define regs_return_value(_regs) ((_regs)->regs[2])
 #define instruction_pointer(regs) ((regs)->cp0_epc)
 #define profile_pc(regs) instruction_pointer(regs)