2 files changed, 31 insertions, 0 deletions

diff --git a/include/linux/kgdb.h b/include/linux/kgdb.h
index 092e4250a45..10ca03d0a25 100644
--- a/include/linux/kgdb.h
+++ b/include/linux/kgdb.h
@@ -297,6 +297,7 @@ extern int
 kgdb_handle_exception(int ex_vector, int signo, int err_code,
                       struct pt_regs *regs);
 extern int kgdb_nmicallback(int cpu, void *regs);
+extern void gdbstub_exit(int status);
 
 extern int                      kgdb_single_step;
 extern atomic_t                 kgdb_active;
diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
index 481a7bd2dfe..a11db956dd6 100644
--- a/kernel/debug/gdbstub.c
+++ b/kernel/debug/gdbstub.c
@@ -1093,3 +1093,33 @@ int gdbstub_state(struct kgdb_state *ks, char *cmd)
         put_packet(remcom_out_buffer);
         return 0;
 }
+
+/**
+ * gdbstub_exit - Send an exit message to GDB
+ * @status: The exit code to report.
+ */
+void gdbstub_exit(int status)
+{
+        unsigned char checksum, ch, buffer[3];
+        int loop;
+
+        buffer[0] = 'W';
+        buffer[1] = hex_asc_hi(status);
+        buffer[2] = hex_asc_lo(status);
+
+        dbg_io_ops->write_char('$');
+        checksum = 0;
+
+        for (loop = 0; loop < 3; loop++) {
+                ch = buffer[loop];
+                checksum += ch;
+                dbg_io_ops->write_char(ch);
+        }
+
+        dbg_io_ops->write_char('#');
+        dbg_io_ops->write_char(hex_asc_hi(checksum));
+        dbg_io_ops->write_char(hex_asc_lo(checksum));
+
+        /* make sure the output is flushed, lest the bootloader clobber it */
+        dbg_io_ops->flush();
+}