aboutsummaryrefslogtreecommitdiff
path: root/gdb/xmodem.c
diff options
context:
space:
mode:
authorStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
committerStan Shebs <shebs@codesourcery.com>1999-04-16 01:35:26 +0000
commitc906108c21474dfb4ed285bcc0ac6fe02cd400cc (patch)
treea0015aa5cedc19ccbab307251353a41722a3ae13 /gdb/xmodem.c
parentcd946cff9ede3f30935803403f06f6ed30cad136 (diff)
downloadgdb-c906108c21474dfb4ed285bcc0ac6fe02cd400cc.zip
gdb-c906108c21474dfb4ed285bcc0ac6fe02cd400cc.tar.gz
gdb-c906108c21474dfb4ed285bcc0ac6fe02cd400cc.tar.bz2
Initial creation of sourceware repositorygdb-4_18-branchpoint
Diffstat (limited to 'gdb/xmodem.c')
-rw-r--r--gdb/xmodem.c284
1 files changed, 284 insertions, 0 deletions
diff --git a/gdb/xmodem.c b/gdb/xmodem.c
new file mode 100644
index 0000000..dd13b87
--- /dev/null
+++ b/gdb/xmodem.c
@@ -0,0 +1,284 @@
+/* XMODEM support for GDB, the GNU debugger.
+ Copyright 1995 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+This program is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
+
+#include "defs.h"
+#include "serial.h"
+#include "target.h"
+#include "xmodem.h"
+
+/* These definitions are for xmodem protocol. */
+
+#define SOH 0x01
+#define STX 0x02
+#define ACK 0x06
+#define NAK 0x15
+#define EOT 0x04
+#define CANCEL 0x18
+
+static int blknum; /* XMODEM block number */
+static int crcflag; /* Sez we are using CRC's instead of cksums */
+
+static int
+readchar (desc, timeout)
+ serial_t desc;
+ int timeout;
+{
+ int c;
+
+ c = SERIAL_READCHAR (desc, timeout);
+
+ if (remote_debug > 0)
+ fputc_unfiltered (c, gdb_stderr);
+
+ if (c >= 0)
+ return c;
+
+ if (c == SERIAL_TIMEOUT)
+ error ("Timeout reading from remote system.");
+
+ perror_with_name ("xmodem.c:readchar()");
+}
+
+#define CRC16 0x1021 /* Generator polynomial (X^16 + X^12 + X^5 + 1) */
+
+static unsigned short *crctab;
+
+/* Call this to init the fast CRC-16 calculation table. */
+
+static void
+crcinit ()
+{
+ static int crctab_inited = 0;
+ int val;
+
+ if (crctab_inited == 1)
+ return;
+
+ crctab = xmalloc (256 * sizeof (short));
+
+ for (val = 0; val <= 255; val++)
+ {
+ int i;
+ unsigned int crc;
+
+ crc = val << 8;
+
+ for (i = 0; i < 8; ++i)
+ {
+ crc <<= 1;
+
+ if (crc & 0x10000)
+ crc ^= CRC16;
+ }
+
+ crctab [val] = crc;
+ }
+
+ crctab_inited = 1;
+}
+
+/* Calculate a CRC-16 for the LEN byte message pointed at by P. */
+
+static unsigned short
+docrc (p, len)
+ unsigned char *p;
+ int len;
+{
+ unsigned short crc = 0;
+
+ while (len-- > 0)
+ crc = (crc << 8) ^ crctab [(crc >> 8) ^ *p++];
+
+ return crc;
+}
+
+/* Start up the transmit process. Reset state variables. Wait for receiver to
+ send NAK or CRC request. */
+
+int
+xmodem_init_xfer (desc)
+ serial_t desc;
+{
+ int c;
+ int i;
+
+ blknum = 1;
+ crcflag = 0;
+ crcinit ();
+
+ for (i = 1; i <= 10; i++)
+ {
+ c = readchar (desc, 6);
+
+ switch (c)
+ {
+ case 'C':
+ crcflag = 1;
+ case NAK:
+ return 0;
+ default:
+ fprintf_unfiltered (gdb_stderr, "xmodem_init_xfer: Got unexpected character %c (0%o)\n", c, c);
+ continue;
+ case CANCEL: /* target aborted load */
+ fprintf_unfiltered (gdb_stderr, "Got a CANCEL from the target.\n");
+ continue;
+ }
+ }
+ error ("xmodem_init_xfer: Too many unexpected characters.");
+}
+
+/* Take 128 bytes of data and make a packet out of it.
+ *
+ * Each packet looks like this:
+ * +-----+-------+-------+------+-----+
+ * | SOH | Seq1. | Seq2. | data | SUM |
+ * +-----+-------+-------+------+-----+
+ * SOH = 0x01
+ * Seq1 = The sequence number.
+ * Seq2 = The complement of the sequence number.
+ * Data = A 128 bytes of data.
+ * SUM = Add the contents of the 128 bytes and use the low-order
+ * 8 bits of the result.
+ *
+ * send_xmodem_packet fills in the XMODEM fields of PACKET and sends it to the
+ * remote system. PACKET must be XMODEM_PACKETSIZE bytes long. The data must
+ * start 3 bytes after the beginning of the packet to leave room for the
+ * XMODEM header. LEN is the length of the data portion of the packet (and
+ * must be <= 128 bytes). If it is < 128 bytes, ^Z padding will be added.
+ */
+
+void
+xmodem_send_packet (desc, packet, len, hashmark)
+ serial_t desc;
+ unsigned char *packet;
+ int len;
+ int hashmark;
+{
+ int i;
+ int retries;
+ int pktlen;
+ int datasize;
+
+ /* build the packet header */
+
+ packet[1] = blknum;
+ packet[2] = ~blknum;
+
+ blknum++;
+
+ if (len <= XMODEM_DATASIZE)
+ {
+ packet[0] = SOH;
+ datasize = XMODEM_DATASIZE;
+ }
+ else if (len <= XMODEM_1KDATASIZE)
+ {
+ packet[0] = STX;
+ datasize = XMODEM_1KDATASIZE;
+ }
+ else
+ abort (); /* Packet way too large */
+
+ /* Add ^Z padding if packet < 128 (or 1024) bytes */
+
+ memset (packet + 3 + len, '\026', datasize - len);
+
+ if (crcflag)
+ {
+ int crc;
+
+ crc = docrc (packet + 3, datasize);
+
+ packet[3 + datasize] = crc >> 8;
+ packet[3 + datasize + 1] = crc;
+ pktlen = datasize + 5;
+ }
+ else
+ {
+ int sum;
+
+ sum = 0;
+ for (i = 3; i < datasize + 3; i++)
+ sum += packet[i];
+
+ packet[3 + datasize] = sum; /* add the checksum */
+ pktlen = datasize + 4;
+ }
+
+ for (retries = 3; retries >= 0; retries--)
+ {
+ int c;
+
+ SERIAL_WRITE (desc, packet, pktlen);
+
+ c = readchar (desc, 3);
+ switch (c)
+ {
+ case ACK:
+ return;
+ case NAK:
+ if (!hashmark)
+ continue;
+ putchar_unfiltered ('-');
+ gdb_flush (gdb_stdout);
+ continue;
+ case CANCEL:
+ error ("xmodem_send_packet: Transfer aborted by receiver.");
+ default:
+ fprintf_unfiltered (gdb_stderr, "xmodem_send_packet: Got unexpected character %c (0%o)\n", c, c);
+ continue;
+ }
+ }
+
+ SERIAL_WRITE (desc, "\004", 1); /* Send an EOT */
+
+ error ("xmodem_send_packet: Excessive retries.");
+}
+
+/* Finish off the transfer. Send out the EOT, and wait for an ACK. */
+
+void
+xmodem_finish_xfer (desc)
+ serial_t desc;
+{
+ int retries;
+
+ for (retries = 10; retries >= 0; retries--)
+ {
+ int c;
+
+ SERIAL_WRITE (desc, "\004", 1); /* Send an EOT */
+
+ c = readchar (desc, 3);
+ switch (c)
+ {
+ case ACK:
+ return;
+ case NAK:
+ continue;
+ case CANCEL:
+ error ("xmodem_finish_xfer: Transfer aborted by receiver.");
+ default:
+ fprintf_unfiltered (gdb_stderr, "xmodem_send_packet: Got unexpected character %c (0%o)\n", c, c);
+ continue;
+ }
+ }
+
+ error ("xmodem_finish_xfer: Excessive retries.");
+}