* gdbserver/{remote-gutils.c remote-server.c Makefile.in
configure.in remote-inflow.c remote-utils.c}: New files to support GDB remote server. Currently only works for Lynx.
This commit is contained in:
Stu Grossman
parent
185a1705bb
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5 changed files with 1599 additions and 0 deletions
339
gdb/gdbserver/remote-utils.c
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339
gdb/gdbserver/remote-utils.c
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/* Remote utility routines for the remote server for GDB.
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Copyright (C) 1986, 1989, 1993 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include "defs.h"
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#include <stdio.h>
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#include <signal.h>
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#include <sys/wait.h>
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#include <sys/ioctl.h>
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#include <a.out.h>
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#include <sys/file.h>
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#include <sgtty.h>
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extern int remote_desc;
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extern int remote_debugging;
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extern int kiodebug;
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void remote_open ();
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void remote_send ();
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void putpkt ();
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void getpkt ();
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void write_ok ();
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void write_enn ();
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void convert_ascii_to_int ();
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void convert_int_to_ascii ();
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void prepare_resume_reply ();
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/* Open a connection to a remote debugger.
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NAME is the filename used for communication. */
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void
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remote_open (name, from_tty)
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char *name;
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int from_tty;
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{
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struct sgttyb sg;
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remote_debugging = 0;
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remote_desc = open (name, O_RDWR);
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if (remote_desc < 0)
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perror_with_name ("Could not open remote device");
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ioctl (remote_desc, TIOCGETP, &sg);
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sg.sg_flags = RAW;
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ioctl (remote_desc, TIOCSETP, &sg);
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fprintf (stderr, "Remote debugging using %s\n", name);
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remote_debugging = 1;
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}
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/* Convert hex digit A to a number. */
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static int
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fromhex (a)
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int a;
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{
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if (a >= '0' && a <= '9')
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return a - '0';
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else if (a >= 'a' && a <= 'f')
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return a - 'a' + 10;
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else
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error ("Reply contains invalid hex digit");
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}
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/* Convert number NIB to a hex digit. */
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static int
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tohex (nib)
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int nib;
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{
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if (nib < 10)
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return '0' + nib;
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else
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return 'a' + nib - 10;
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}
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/* Send the command in BUF to the remote machine,
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and read the reply into BUF.
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Report an error if we get an error reply. */
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void
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remote_send (buf)
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char *buf;
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{
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putpkt (buf);
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getpkt (buf);
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if (buf[0] == 'E')
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error ("Remote failure reply: E");
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}
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/* Send a packet to the remote machine, with error checking.
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The data of the packet is in BUF. */
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void
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putpkt (buf)
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char *buf;
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{
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int i;
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unsigned char csum = 0;
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char buf2[2000];
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char buf3[1];
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int cnt = strlen (buf);
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char *p;
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/* Copy the packet into buffer BUF2, encapsulating it
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and giving it a checksum. */
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p = buf2;
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*p++ = '$';
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for (i = 0; i < cnt; i++)
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{
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csum += buf[i];
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*p++ = buf[i];
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}
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*p++ = '#';
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*p++ = tohex ((csum >> 4) & 0xf);
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*p++ = tohex (csum & 0xf);
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/* Send it over and over until we get a positive ack. */
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do
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{
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write (remote_desc, buf2, p - buf2);
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read (remote_desc, buf3, 1);
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}
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while (buf3[0] != '+');
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}
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static int
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readchar ()
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{
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char buf[1];
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while (read (remote_desc, buf, 1) != 1);
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return buf[0] & 0x7f;
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}
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/* Read a packet from the remote machine, with error checking,
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and store it in BUF. */
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void
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getpkt (buf)
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char *buf;
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{
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char *bp;
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unsigned char csum, c, c1, c2;
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extern kiodebug;
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while (1)
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{
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csum = 0;
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while ((c = readchar ()) != '$');
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bp = buf;
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while (1)
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{
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c = readchar ();
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if (c == '#')
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break;
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*bp++ = c;
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csum += c;
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}
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*bp = 0;
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c1 = fromhex (readchar ());
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c2 = fromhex (readchar ());
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if (csum == (c1 << 4) + c2)
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break;
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fprintf (stderr, "Bad checksum, sentsum=0x%x, csum=0x%x, buf=%s\n",
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(c1 << 4) + c2, csum, buf);
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write (remote_desc, "-", 1);
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}
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write (remote_desc, "+", 1);
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}
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void
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write_ok (buf)
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char *buf;
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{
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buf[0] = 'O';
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buf[1] = 'k';
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buf[2] = '\0';
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}
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void
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write_enn (buf)
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char *buf;
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{
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buf[0] = 'E';
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buf[1] = 'N';
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buf[2] = 'N';
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buf[3] = '\0';
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}
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void
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convert_int_to_ascii (from, to, n)
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char *from, *to;
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int n;
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{
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int nib;
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char ch;
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while (n--)
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{
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ch = *from++;
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nib = ((ch & 0xf0) >> 4) & 0x0f;
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*to++ = tohex (nib);
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nib = ch & 0x0f;
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*to++ = tohex (nib);
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}
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*to++ = 0;
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}
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void
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convert_ascii_to_int (from, to, n)
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char *from, *to;
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int n;
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{
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int nib1, nib2;
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while (n--)
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{
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nib1 = fromhex (*from++);
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nib2 = fromhex (*from++);
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*to++ = (((nib1 & 0x0f) << 4) & 0xf0) | (nib2 & 0x0f);
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}
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}
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static char *
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outreg(regno, buf)
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int regno;
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char *buf;
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{
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extern char registers[];
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*buf++ = tohex (regno >> 4);
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*buf++ = tohex (regno & 0xf);
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*buf++ = ':';
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convert_int_to_ascii (®isters[REGISTER_BYTE (regno)], buf, 4);
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buf += 8;
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*buf++ = ';';
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return buf;
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}
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void
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prepare_resume_reply (buf, status, signal)
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char *buf, status;
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unsigned char signal;
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{
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int nib;
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char ch;
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*buf++ = 'T';
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nib = ((signal & 0xf0) >> 4);
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*buf++ = tohex (nib);
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nib = signal & 0x0f;
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*buf++ = tohex (nib);
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buf = outreg (PC_REGNUM, buf);
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buf = outreg (FP_REGNUM, buf);
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buf = outreg (SP_REGNUM, buf);
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#ifdef NPC_REGNUM
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buf = outreg (NPC_REGNUM, buf);
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#endif
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#ifdef O7_REGNUM
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buf = outreg (O7_REGNUM, buf);
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#endif
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*buf++ = 0;
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}
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void
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decode_m_packet (from, mem_addr_ptr, len_ptr)
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char *from;
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unsigned int *mem_addr_ptr, *len_ptr;
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{
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int i = 0, j = 0;
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char ch;
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*mem_addr_ptr = *len_ptr = 0;
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while ((ch = from[i++]) != ',')
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{
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*mem_addr_ptr = *mem_addr_ptr << 4;
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*mem_addr_ptr |= fromhex (ch) & 0x0f;
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}
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for (j = 0; j < 4; j++)
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{
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if ((ch = from[i++]) == 0)
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break;
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*len_ptr = *len_ptr << 4;
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*len_ptr |= fromhex (ch) & 0x0f;
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}
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}
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void
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decode_M_packet (from, mem_addr_ptr, len_ptr, to)
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char *from, *to;
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unsigned int *mem_addr_ptr, *len_ptr;
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{
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int i = 0, j = 0;
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char ch;
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*mem_addr_ptr = *len_ptr = 0;
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while ((ch = from[i++]) != ',')
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{
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*mem_addr_ptr = *mem_addr_ptr << 4;
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*mem_addr_ptr |= fromhex (ch) & 0x0f;
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}
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while ((ch = from[i++]) != ':')
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{
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*len_ptr = *len_ptr << 4;
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*len_ptr |= fromhex (ch) & 0x0f;
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}
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convert_ascii_to_int (&from[i++], to, *len_ptr);
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}
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