Re: [PATCH v2 2/2] gdbstub: do not split gdb_monitor_write payload

["Philippe Mathieu-Daudé" <philmd@redhat.com>]

On 12/11/19 5:05 PM, Damien Hedde wrote:
> Since we can now send packets of arbitrary length:
> simplify gdb_monitor_write() and send the whole payload
> in one packet.

While we can send arbitrary length on the wire, we advertise 
PacketSize=MAX_PACKET_LENGTH in handle_query_supported().

We can raise this limit however.

> Suggested-by: Luc Michel <luc.michel@greensocs.com>
> Signed-off-by: Damien Hedde <damien.hedde@greensocs.com>
> ---
>   gdbstub.c | 23 +++--------------------
>   1 file changed, 3 insertions(+), 20 deletions(-)
> 
> diff --git a/gdbstub.c b/gdbstub.c
> index 93b26f1b86..ef999abee2 100644
> --- a/gdbstub.c
> +++ b/gdbstub.c
> @@ -3200,28 +3200,11 @@ static void gdb_chr_event(void *opaque, int event)
>       }
>   }
>   
> -static void gdb_monitor_output(GDBState *s, 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(&gdbserver_state, p, len);
> -            break;
> -        }
> -        gdb_monitor_output(&gdbserver_state, 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;
>   }
>   
>