[Qemu-devel] [PATCH v3 07/45] windbg: added chardev

[Mihail Abakumov]

Added chardev for listening to windbg. Target device is a parameter in the 
'-windbg' option.

Signed-off-by: Mihail Abakumov <mikhail.abaku...@ispras.ru>
Acked-by: Alistair Francis <alistair.fran...@xilinx.com>
Signed-off-by: Pavel Dovgalyuk <dovga...@ispras.ru>
Signed-off-by: Dmitriy Koltunov <koltu...@ispras.ru>
---
 windbgstub.c |   30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/windbgstub.c b/windbgstub.c
index 0863da73fd..e30b8500e0 100755
--- a/windbgstub.c
+++ b/windbgstub.c
@@ -20,12 +20,26 @@
 typedef struct WindbgState {
     bool is_loaded;
 
+    CharBackend chr;
+
     uint32_t ctrl_packet_id;
     uint32_t data_packet_id;
 } WindbgState;
 
 static WindbgState *windbg_state;
 
+static int windbg_chr_can_receive(void *opaque)
+{
+    return PACKET_MAX_SIZE;
+}
+
+static void windbg_chr_receive(void *opaque, const uint8_t *buf, int size)
+{
+    if (windbg_state->is_loaded) {
+        /* T0D0: parse data */
+    }
+}
+
 static void windbg_exit(void)
 {
     g_free(windbg_state);
@@ -33,15 +47,31 @@ static void windbg_exit(void)
 
 int windbg_server_start(const char *device)
 {
+    Chardev *chr = NULL;
+
     if (windbg_state) {
         WINDBG_ERROR("Multiple instances of windbg are not supported.");
         exit(1);
     }
 
+    if (!strstart(device, "pipe:", NULL)) {
+        WINDBG_ERROR("Unsupported device. Supported only pipe.");
+        exit(1);
+    }
+
     windbg_state = g_new0(WindbgState, 1);
     windbg_state->ctrl_packet_id = RESET_PACKET_ID;
     windbg_state->data_packet_id = INITIAL_PACKET_ID;
 
+    chr = qemu_chr_new_noreplay(WINDBG, device);
+    if (!chr) {
+        return -1;
+    }
+
+    qemu_chr_fe_init(&windbg_state->chr, chr, &error_abort);
+    qemu_chr_fe_set_handlers(&windbg_state->chr, windbg_chr_can_receive,
+                             windbg_chr_receive, NULL, NULL, NULL, NULL, true);
+
     atexit(windbg_exit);
     return 0;
 }