Initial creation of sourceware repositorygdb-4_18-branchpoint

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.");
+}