static struct packet_config remote_protocol_packets[PACKET_MAX];
+/* gdbserver < 7.7 (before its fix from 2013-12-11) did reply to any
+ unknown 'v' packet with string "OK". "OK" gets interpreted by GDB
+ as a reply to known packet. For packet "vFile:setfs:" it is an
+ invalid reply and GDB would return error in
+ remote_hostio_set_filesystem, making remote files access impossible.
+ If this variable is non-zero it means the remote gdbserver is buggy
+ and any not yet detected packets are assumed as unsupported. */
+static int unknown_v_replies_ok;
+
/* Returns the packet's corresponding "set remote foo-packet" command
state. See struct packet_config for more details. */
case AUTO_BOOLEAN_FALSE:
return PACKET_DISABLE;
case AUTO_BOOLEAN_AUTO:
+ if (unknown_v_replies_ok && config->name != NULL
+ && config->name[0] == 'v')
+ return PACKET_DISABLE;
return config->support;
default:
gdb_assert_not_reached (_("bad switch"));
if (packet_support (PACKET_QAllow) != PACKET_DISABLE)
remote_set_permissions (target);
+ /* See unknown_v_replies_ok description. */
+ {
+ const char v_mustreplyempty[] = "vMustReplyEmpty";
+
+ putpkt (v_mustreplyempty);
+ getpkt (&rs->buf, &rs->buf_size, 0);
+ if (strcmp (rs->buf, "OK") == 0)
+ unknown_v_replies_ok = 1;
+ else if (strcmp (rs->buf, "") == 0)
+ unknown_v_replies_ok = 0;
+ else
+ error (_("Remote replied unexpectedly to '%s': %s"), v_mustreplyempty,
+ rs->buf);
+ }
+
/* Next, we possibly activate noack mode.
If the QStartNoAckMode packet configuration is set to AUTO,