Blackfin: kgdb: disable interrupt when single stepping in ADEOS

When ADEOS and kgdb are both enabled, single step in linux kernel may be
scheduled to Xenomai core after return from interrupt handlers.  This
blocks gdb continue operation after a break point is hit.  So, disable
interrupt when running gdb single step.
Signed-off-by: Sonic Zhang <sonic.zhang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

arch/blackfin/kernel/kgdb.c

@@ -345,6 +345,18 @@ void kgdb_roundup_cpu(int cpu, unsigned long flags)
 }
 #endif
 
+#ifdef CONFIG_IPIPE
+static unsigned long kgdb_arch_imask;
+
+void kgdb_post_primary_code(struct pt_regs *regs, int e_vector, int err_code)
+{
+	if (kgdb_arch_imask) {
+		cpu_pda[raw_smp_processor_id()].ex_imask = kgdb_arch_imask;
+		kgdb_arch_imask = 0;
+	}
+}
+#endif
+
 int kgdb_arch_handle_exception(int vector, int signo,
 			       int err_code, char *remcom_in_buffer,
 			       char *remcom_out_buffer,
@@ -388,6 +400,11 @@ int kgdb_arch_handle_exception(int vector, int signo,
 			 * kgdb_single_step > 0 means in single step mode
 			 */
 			kgdb_single_step = i + 1;
+
+#ifdef CONFIG_IPIPE
+			kgdb_arch_imask = cpu_pda[raw_smp_processor_id()].ex_imask;
+			cpu_pda[raw_smp_processor_id()].ex_imask = 0;
+#endif
 		}
 
 		bfin_correct_hw_break();
@@ -448,6 +465,9 @@ void kgdb_arch_set_pc(struct pt_regs *regs, unsigned long ip)
 int kgdb_arch_init(void)
 {
 	kgdb_single_step = 0;
+#ifdef CONFIG_IPIPE
+	kgdb_arch_imask = 0;
+#endif
 
 	bfin_remove_all_hw_break();
 	return 0;