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[gdb] Allow resynchronisation with gdb

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This replaces the gdbstub's polite NAK behavior with retransmission of
the current outstanding reply packet.  It solves situations where gdb
and gPXE's gdbstub get out of sync due to the lack of flow control in
the gdb protocol spec.

Signed-off-by: Michael Brown <mcb30@etherboot.org>
This commit is contained in:
Stefan Hajnoczi 2009-04-15 17:16:31 +01:00 committed by Michael Brown
parent b149a99302
commit 38a1d0fe3f
1 changed files with 4 additions and 6 deletions
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10
src/core/gdbstub.c
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@ -344,12 +344,10 @@ static void gdbstub_state_cksum2 ( struct gdbstub *stub, char ch ) {
static void gdbstub_state_wait_ack ( struct gdbstub *stub, char ch ) {
if ( ch == '+' ) {
stub->parse = gdbstub_state_new;
} else if ( ch == '-' ) {
gdbstub_tx_packet ( stub ); /* retransmit */
} else if ( ch == '$' ) {
/* GDB is reconnecting, drop our packet and listen to GDB */
stub->trans->send ( "-", 1 );
stub->parse = gdbstub_state_new;
} else {
/* This retransmit is very aggressive but necessary to keep
* in sync with GDB. */
gdbstub_tx_packet ( stub );
}
}