Blackfin arch: fix bug when sending signals with the wrong PC, cause gdb get confused

We need to send signals with the proper PC, or gdb gets
confused, and lots of tests fail. This should fix that.
Signed-off-by: Robin Getz <robin.getz@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>

arch/blackfin/kernel/traps.c

@@ -463,18 +463,20 @@ asmlinkage void trap_c(struct pt_regs *fp)
 #endif
 			panic("Kernel exception");
 		}
-
-		/* Ensure that bad return addresses don't end up in an infinite
-		 * loop, due to speculative loads/reads
-		 */
-		if (trapnr == VEC_CPLB_I_M)
-			fp->pc = SAFE_USER_INSTRUCTION;
 	}
+
 	info.si_signo = sig;
 	info.si_errno = 0;
 	info.si_addr = (void *)fp->pc;
 	force_sig_info(sig, &info, current);
 
+	/* Ensure that bad return addresses don't end up in an infinite
+	 * loop, due to speculative loads/reads. This needs to be done after
+	 * the signal has been sent.
+	 */
+	if (trapnr == VEC_CPLB_I_M && sig != SIGTRAP)
+		fp->pc = SAFE_USER_INSTRUCTION;
+
 	trace_buffer_restore(j);
 	return;
 }