gdbstub: do not split gdb_monitor_write payload

Since we can now send packets of arbitrary length:
simplify gdb_monitor_write() and send the whole payload
in one packet.

Suggested-by: Luc Michel <luc.michel@greensocs.com>
Signed-off-by: Damien Hedde <damien.hedde@greensocs.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20191211160514.58373-3-damien.hedde@greensocs.com>
Message-Id: <20200316172155.971-28-alex.bennee@linaro.org>

gdbstub.c

@@ -3200,28 +3200,11 @@ static void gdb_chr_event(void *opaque, QEMUChrEvent event)
     }
 }
 
-static void gdb_monitor_output(const char *msg, int len)
-{
-    g_autoptr(GString) buf = g_string_new("O");
-    memtohex(buf, (uint8_t *)msg, len);
-    put_packet(buf->str);
-}
-
 static int gdb_monitor_write(Chardev *chr, const uint8_t *buf, int len)
 {
-    const char *p = (const char *)buf;
-    int max_sz;
-
-    max_sz = (MAX_PACKET_LENGTH / 2) + 1;
-    for (;;) {
-        if (len <= max_sz) {
-            gdb_monitor_output(p, len);
-            break;
-        }
-        gdb_monitor_output(p, max_sz);
-        p += max_sz;
-        len -= max_sz;
-    }
+    g_autoptr(GString) hex_buf = g_string_new("O");
+    memtohex(hex_buf, buf, len);
+    put_packet(hex_buf->str);
     return len;
 }