1 /* XMODEM support for GDB, the GNU debugger.
2 Copyright 1995 Free Software Foundation, Inc.
4 This file is part of GDB.
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
25 /* These definitions are for xmodem protocol. */
34 static int blknum
; /* XMODEM block number */
35 static int crcflag
; /* Sez we are using CRC's instead of cksums */
38 readchar (desc
, timeout
)
44 c
= SERIAL_READCHAR (desc
, timeout
);
47 fputc_unfiltered (c
, gdb_stderr
);
52 if (c
== SERIAL_TIMEOUT
)
53 error ("Timeout reading from remote system.");
55 perror_with_name ("xmodem.c:readchar()");
58 #define CRC16 0x1021 /* Generator polynomial (X^16 + X^12 + X^5 + 1) */
60 static unsigned short *crctab
;
62 /* Call this to init the fast CRC-16 calculation table. */
67 static int crctab_inited
= 0;
70 if (crctab_inited
== 1)
73 crctab
= xmalloc (256 * sizeof (short));
75 for (val
= 0; val
<= 255; val
++)
82 for (i
= 0; i
< 8; ++i
)
96 /* Calculate a CRC-16 for the LEN byte message pointed at by P. */
103 unsigned short crc
= 0;
106 crc
= (crc
<< 8) ^ crctab
[(crc
>> 8) ^ *p
++];
111 /* Start up the transmit process. Reset state variables. Wait for receiver to
112 send NAK or CRC request. */
115 xmodem_init_xfer (desc
)
125 for (i
= 1; i
<= 10; i
++)
127 c
= readchar (desc
, 6);
136 fprintf_unfiltered (gdb_stderr
, "xmodem_init_xfer: Got unexpected character %c (0%o)\n", c
, c
);
138 case CANCEL
: /* target aborted load */
139 fprintf_unfiltered (gdb_stderr
, "Got a CANCEL from the target.\n");
143 error ("xmodem_init_xfer: Too many unexpected characters.");
146 /* Take 128 bytes of data and make a packet out of it.
148 * Each packet looks like this:
149 * +-----+-------+-------+------+-----+
150 * | SOH | Seq1. | Seq2. | data | SUM |
151 * +-----+-------+-------+------+-----+
153 * Seq1 = The sequence number.
154 * Seq2 = The complement of the sequence number.
155 * Data = A 128 bytes of data.
156 * SUM = Add the contents of the 128 bytes and use the low-order
157 * 8 bits of the result.
159 * send_xmodem_packet fills in the XMODEM fields of PACKET and sends it to the
160 * remote system. PACKET must be XMODEM_PACKETSIZE bytes long. The data must
161 * start 3 bytes after the beginning of the packet to leave room for the
162 * XMODEM header. LEN is the length of the data portion of the packet (and
163 * must be <= 128 bytes). If it is < 128 bytes, ^Z padding will be added.
167 xmodem_send_packet (desc
, packet
, len
, hashmark
)
169 unsigned char *packet
;
178 /* build the packet header */
185 if (len
<= XMODEM_DATASIZE
)
188 datasize
= XMODEM_DATASIZE
;
190 else if (len
<= XMODEM_1KDATASIZE
)
193 datasize
= XMODEM_1KDATASIZE
;
196 abort (); /* Packet way too large */
198 /* Add ^Z padding if packet < 128 (or 1024) bytes */
200 memset (packet
+ 3 + len
, '\026', datasize
- len
);
206 crc
= docrc (packet
+ 3, datasize
);
208 packet
[3 + datasize
] = crc
>> 8;
209 packet
[3 + datasize
+ 1] = crc
;
210 pktlen
= datasize
+ 5;
217 for (i
= 3; i
< datasize
+ 3; i
++)
220 packet
[3 + datasize
] = sum
; /* add the checksum */
221 pktlen
= datasize
+ 4;
224 for (retries
= 3; retries
>= 0; retries
--)
228 SERIAL_WRITE (desc
, packet
, pktlen
);
230 c
= readchar (desc
, 3);
238 putchar_unfiltered ('-');
239 gdb_flush (gdb_stdout
);
242 error ("xmodem_send_packet: Transfer aborted by receiver.");
244 fprintf_unfiltered (gdb_stderr
, "xmodem_send_packet: Got unexpected character %c (0%o)\n", c
, c
);
249 SERIAL_WRITE (desc
, "\004", 1); /* Send an EOT */
251 error ("xmodem_send_packet: Excessive retries.");
254 /* Finish off the transfer. Send out the EOT, and wait for an ACK. */
257 xmodem_finish_xfer (desc
)
262 for (retries
= 10; retries
>= 0; retries
--)
266 SERIAL_WRITE (desc
, "\004", 1); /* Send an EOT */
268 c
= readchar (desc
, 3);
276 error ("xmodem_finish_xfer: Transfer aborted by receiver.");
278 fprintf_unfiltered (gdb_stderr
, "xmodem_send_packet: Got unexpected character %c (0%o)\n", c
, c
);
283 error ("xmodem_finish_xfer: Excessive retries.");
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