diff options
Diffstat (limited to 'gdb/remote.c')
| -rw-r--r-- | gdb/remote.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/gdb/remote.c b/gdb/remote.c index 5c407b6..a88f4cd 100644 --- a/gdb/remote.c +++ b/gdb/remote.c @@ -1496,6 +1496,15 @@ enum { 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. */ @@ -1519,6 +1528,9 @@ packet_config_support (struct packet_config *config) 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")); @@ -4023,6 +4035,21 @@ remote_start_remote (int from_tty, struct target_ops *target, int extended_p) 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, |