1 files changed, 15 insertions, 7 deletions

diff --git a/kernel/debug/gdbstub.c b/kernel/debug/gdbstub.c
index a11db956dd6..34872482315 100644
--- a/kernel/debug/gdbstub.c
+++ b/kernel/debug/gdbstub.c
@@ -42,6 +42,8 @@
 /* Our I/O buffers. */
 static char                     remcom_in_buffer[BUFMAX];
 static char                     remcom_out_buffer[BUFMAX];
+static int                      gdbstub_use_prev_in_buf;
+static int                      gdbstub_prev_in_buf_pos;
 
 /* Storage for the registers, in GDB format. */
 static unsigned long            gdb_regs[(NUMREGBYTES +
@@ -58,6 +60,13 @@ static int gdbstub_read_wait(void)
         int ret = -1;
         int i;
 
+        if (unlikely(gdbstub_use_prev_in_buf)) {
+                if (gdbstub_prev_in_buf_pos < gdbstub_use_prev_in_buf)
+                        return remcom_in_buffer[gdbstub_prev_in_buf_pos++];
+                else
+                        gdbstub_use_prev_in_buf = 0;
+        }
+
         /* poll any additional I/O interfaces that are defined */
         while (ret < 0)
                 for (i = 0; kdb_poll_funcs[i] != NULL; i++) {
@@ -109,7 +118,6 @@ static void get_packet(char *buffer)
                         buffer[count] = ch;
                         count = count + 1;
                 }
-                buffer[count] = 0;
 
                 if (ch == '#') {
                         xmitcsum = hex_to_bin(gdbstub_read_wait()) << 4;
@@ -124,6 +132,7 @@ static void get_packet(char *buffer)
                         if (dbg_io_ops->flush)
                                 dbg_io_ops->flush();
                 }
+                buffer[count] = 0;
         } while (checksum != xmitcsum);
 }
 
@@ -1082,12 +1091,11 @@ int gdbstub_state(struct kgdb_state *ks, char *cmd)
         case 'c':
                 strcpy(remcom_in_buffer, cmd);
                 return 0;
-        case '?':
-                gdb_cmd_status(ks);
-                break;
-        case '\0':
-                strcpy(remcom_out_buffer, "");
-                break;
+        case '$':
+                strcpy(remcom_in_buffer, cmd);
+                gdbstub_use_prev_in_buf = strlen(remcom_in_buffer);
+                gdbstub_prev_in_buf_pos = 0;
+                return 0;
         }
         dbg_io_ops->write_char('+');
         put_packet(remcom_out_buffer);