627 lines
14 KiB
C
627 lines
14 KiB
C
/*-
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* Copyright (c) 1991 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Van Jacobson and Steven McCanne of Lawrence Berkeley Laboratory.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Header: /home/cvs/386BSD/src/usr.bin/gdb/remote.c,v 1.1.1.1 1993/06/12 14:52:22 rgrimes Exp $;
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*/
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#ifndef lint
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static char sccsid[] = "@(#)remote.c 6.5 (Berkeley) 5/8/91";
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#endif /* not lint */
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#include "param.h"
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#include <stdio.h>
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#include <varargs.h>
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#include <signal.h>
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#include <sys/types.h>
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#include <sys/ioctl.h>
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#include <sys/file.h>
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#include "defs.h"
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#include "frame.h"
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#include "inferior.h"
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#include "wait.h"
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#include "kgdb_proto.h"
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static FILE *kiodebug;
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static int icache = 1;
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extern int kernel_debugging;
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static int remote_cache_valid;
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static int remote_instub;
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static void remote_signal();
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static void remote_debug();
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static void print_msg();
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static int remote_mtu;
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static int (*send_msg)();
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static int (*recv_msg)();
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static void (*closelink)();
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static u_char *inbuffer;
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static u_char *outbuffer;
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/*
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* Statistics.
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*/
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static int remote_ierrs;
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static int remote_oerrs;
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static int remote_seqerrs;
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static int remote_spurious;
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#define PUTCMD(cmd) m_xchg(cmd, (u_char *)0, 0, (u_char *)0, (int *)0)
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/*
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* Send an outbound message to the remote machine and read the reply.
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* Either or both message buffers may be NULL.
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*/
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static int
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m_xchg(type, out, outlen, in, inlen)
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int type;
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u_char *out;
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int outlen;
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u_char *in;
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int *inlen;
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{
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register int err, (*send)() = send_msg, (*recv)() = recv_msg;
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int ack;
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static int seqbit = 0;
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if (!remote_instub) {
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remote_instub = 1;
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PUTCMD(KGDB_EXEC);
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}
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seqbit ^= KGDB_SEQ;
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while (1) {
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err = (*send)(type | seqbit, out, outlen);
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if (err) {
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++remote_oerrs;
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if (kiodebug)
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remote_debug("send error %d\n", err);
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}
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if (kiodebug)
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print_msg(type | seqbit, out, outlen, 'O');
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recv:
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err = (*recv)(&ack, in, inlen);
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if (err) {
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++remote_ierrs;
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if (kiodebug)
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remote_debug("recv error %d\n", err);
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remote_cache_valid = 0;
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} else if (kiodebug)
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print_msg(ack, in, inlen ? *inlen : 0, 'I');
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if (err)
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continue;
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if ((ack & KGDB_ACK) == 0 || KGDB_CMD(ack) != KGDB_CMD(type)) {
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++remote_spurious;
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continue;
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}
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if ((ack & KGDB_SEQ) ^ seqbit) {
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++remote_seqerrs;
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goto recv;
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}
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return ack;
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}
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}
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/*
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* Wait for the specified message type. Discard anything else.
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* (this is used by 'remote-signal' to help us resync with other side.)
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*/
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static void
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m_recv(type, in, inlen)
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int type;
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u_char *in;
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int *inlen;
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{
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int reply, err;
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while (1) {
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err = (*recv_msg)(&reply, in, inlen);
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if (err) {
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++remote_ierrs;
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if (kiodebug)
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remote_debug("recv error %d\n", err);
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} else if (kiodebug)
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print_msg(reply, in, inlen ? *inlen : 0, 'I');
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if (KGDB_CMD(reply) == type)
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return;
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++remote_spurious;
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}
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}
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/*
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* Send a message. Do not wait for *any* response from the other side.
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* Some other thread of control will pick up the ack that will be generated.
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*/
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static void
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m_send(type, buf, len)
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int type;
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u_char *buf;
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int len;
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{
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int err;
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if (!remote_instub) {
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remote_instub = 1;
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PUTCMD(KGDB_EXEC);
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}
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err = (*send_msg)(type, buf, len);
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if (err) {
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++remote_ierrs;
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if (kiodebug)
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remote_debug("[send error %d] ", err);
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}
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if (kiodebug)
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print_msg(type, buf, len, 'O');
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}
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/*
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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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*/
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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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int bufsize;
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remote_debugging = 0;
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if (sl_open(name, &send_msg, &recv_msg, &closelink, &remote_mtu,
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&bufsize))
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return;
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if (from_tty)
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printf("Remote debugging using %s\n", name);
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remote_debugging = 1;
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remote_cache_valid = 0;
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inbuffer = (u_char *)malloc(bufsize);
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outbuffer = (u_char *)malloc(bufsize);
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remote_signal();
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remote_ierrs = 0;
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remote_oerrs = 0;
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remote_spurious = 0;
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}
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/*
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* Close the open connection to the remote debugger. Use this when you want
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* to detach and do something else with your gdb.
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*/
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void
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remote_close(from_tty)
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int from_tty;
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{
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if (!remote_debugging)
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error("remote debugging not enabled");
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remote_debugging = 0;
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/*
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* Take remote machine out of debug mode.
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*/
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(void)PUTCMD(KGDB_KILL);
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(*closelink)();
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if (from_tty)
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printf("Ending remote debugging\n");
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free((char *)inbuffer);
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free((char *)outbuffer);
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}
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/*
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* Tell the remote machine to resume.
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*/
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int
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remote_resume(step, signal)
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int step, signal;
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{
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if (!step) {
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(void)PUTCMD(KGDB_CONT);
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remote_instub = 0;
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} else {
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#ifdef NO_SINGLE_STEP
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single_step(0);
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#else
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(void)PUTCMD(KGDB_STEP);
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#endif
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}
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}
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/*
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* Wait until the remote machine stops, then return, storing status in STATUS
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* just as `wait' would.
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*/
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int
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remote_wait(status)
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WAITTYPE *status;
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{
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int len;
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WSETEXIT((*status), 0);
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/*
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* When the machine stops, it will send us a KGDB_SIGNAL message,
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* so we wait for one of these.
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*/
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m_recv(KGDB_SIGNAL, inbuffer, &len);
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WSETSTOP((*status), inbuffer[0]);
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}
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/*
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* Register context as of last remote_fetch_registers().
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*/
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static char reg_cache[REGISTER_BYTES];
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/*
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* Read the remote registers into the block REGS.
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*/
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void
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remote_fetch_registers(regs)
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char *regs;
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{
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int regno, len, rlen, ack;
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u_char *cp, *ep;
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regno = -1;
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do {
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outbuffer[0] = regno + 1;
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ack = m_xchg(remote_cache_valid ?
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KGDB_REG_R|KGDB_DELTA : KGDB_REG_R,
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outbuffer, 1, inbuffer, &len);
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cp = inbuffer;
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ep = cp + len;
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while (cp < ep) {
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regno = *cp++;
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rlen = REGISTER_RAW_SIZE(regno);
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bcopy((char *)cp,
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®_cache[REGISTER_BYTE(regno)], rlen);
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cp += rlen;
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}
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} while (ack & KGDB_MORE);
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remote_cache_valid = 1;
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bcopy(reg_cache, regs, REGISTER_BYTES);
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}
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/*
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* Store the remote registers from the contents of the block REGS.
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*/
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void
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remote_store_registers(regs)
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char *regs;
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{
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u_char *cp, *ep;
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int regno, off, rlen;
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cp = outbuffer;
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ep = cp + remote_mtu;
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for (regno = 0; regno < NUM_REGS; ++regno) {
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off = REGISTER_BYTE(regno);
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rlen = REGISTER_RAW_SIZE(regno);
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if (!remote_cache_valid ||
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bcmp(®s[off], ®_cache[off], rlen) != 0) {
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if (cp + rlen + 1 >= ep) {
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(void)m_xchg(KGDB_REG_W,
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outbuffer, cp - outbuffer,
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(u_char *)0, (int *)0);
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cp = outbuffer;
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}
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*cp++ = regno;
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bcopy(®s[off], cp, rlen);
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cp += rlen;
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}
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}
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if (cp != outbuffer)
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(void)m_xchg(KGDB_REG_W, outbuffer, cp - outbuffer,
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(u_char *)0, (int *)0);
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bcopy(regs, reg_cache, REGISTER_BYTES);
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}
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/*
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* Store a chunk of memory into the remote host.
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* 'remote_addr' is the address in the remote memory space.
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* 'cp' is the address of the buffer in our space, and 'len' is
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* the number of bytes. Returns an errno status.
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*/
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int
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remote_write_inferior_memory(remote_addr, cp, len)
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CORE_ADDR remote_addr;
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u_char *cp;
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int len;
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{
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int cnt;
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while (len > 0) {
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cnt = min(len, remote_mtu - 4);
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bcopy((char *)&remote_addr, outbuffer, 4);
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bcopy(cp, outbuffer + 4, cnt);
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(void)m_xchg(KGDB_MEM_W, outbuffer, cnt + 4, inbuffer, &len);
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if (inbuffer[0])
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return inbuffer[0];
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remote_addr += cnt;
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cp += cnt;
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len -= cnt;
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}
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return 0;
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}
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/*
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* Read memory data directly from the remote machine.
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* 'remote_addr' is the address in the remote memory space.
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* 'cp' is the address of the buffer in our space, and 'len' is
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* the number of bytes. Returns an errno status.
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*/
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static int
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remote_read_memory(remote_addr, cp, len)
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CORE_ADDR remote_addr;
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u_char *cp;
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int len;
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{
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int cnt, inlen;
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while (len > 0) {
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cnt = min(len, remote_mtu - 1);
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outbuffer[0] = cnt;
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bcopy((char *)&remote_addr, (char *)&outbuffer[1], 4);
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(void)m_xchg(KGDB_MEM_R, outbuffer, 5, inbuffer, &inlen);
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if (inbuffer[0] != 0)
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return inbuffer[0];
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if (cnt != inlen - 1)
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/* XXX */
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error("remote_read_memory() request botched");
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bcopy((char *)&inbuffer[1], (char *)cp, cnt);
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remote_addr += cnt;
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cp += cnt;
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len -= cnt;
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}
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return 0;
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}
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int
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remote_read_inferior_memory(remote_addr, cp, len)
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CORE_ADDR remote_addr;
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char *cp;
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int len;
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{
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int stat = 0;
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if (icache) {
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extern CORE_ADDR text_start, text_end;
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CORE_ADDR xferend = remote_addr + len;
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if (remote_addr < text_end && text_start < xferend) {
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/*
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* at least part of this xfer is in the text
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* space -- xfer the overlap from the exec file.
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*/
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if (remote_addr >= text_start && xferend < text_end)
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return (xfer_core_file(remote_addr, cp, len));
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if (remote_addr >= text_start) {
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int i = text_end - remote_addr;
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if (stat = xfer_core_file(remote_addr, cp, i))
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return (stat);
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remote_addr += i;
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cp += i;
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len -= i;
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} else if (xferend <= text_end) {
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int i = xferend - text_start;
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len = text_start - remote_addr;
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if (stat = xfer_core_file(text_start,
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cp + len, i))
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return (stat);
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}
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}
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}
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return remote_read_memory(remote_addr, cp, len);
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}
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/*
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* Signal the remote machine. The remote end might be idle or it might
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* already be in debug mode -- we need to handle both case. Thus, we use
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* the framing character as the wakeup byte, and send a SIGNAL packet.
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* If the remote host is idle, the framing character will wake it up.
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* If it is in the kgdb stub, then we will get a SIGNAL reply.
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*/
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static void
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remote_signal()
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{
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if (!remote_debugging)
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printf("Remote debugging not enabled.\n");
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else {
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remote_instub = 0;
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m_send(KGDB_SIGNAL, (u_char *)0, 0);
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}
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}
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static void
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remote_signal_command()
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{
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extern int stop_after_attach;
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if (!remote_debugging)
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error("Not debugging remote.");
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remote_cache_valid = 0;
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remote_signal();
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restart_remote();
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}
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/*
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* Print a message for debugging.
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*/
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static void
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print_msg(type, buf, len, dir)
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int type;
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u_char *buf;
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int len;
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int dir;
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{
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int i;
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char *s;
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switch (KGDB_CMD(type)) {
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case KGDB_MEM_R: s = "memr"; break;
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case KGDB_MEM_W: s = "memw"; break;
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case KGDB_REG_R: s = "regr"; break;
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case KGDB_REG_W: s = "regw"; break;
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case KGDB_CONT: s = "cont"; break;
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case KGDB_STEP: s = "step"; break;
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case KGDB_KILL: s = "kill"; break;
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case KGDB_SIGNAL: s = "sig "; break;
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case KGDB_EXEC: s = "exec"; break;
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default: s = "unk "; break;
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}
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remote_debug("%c %c%c%c%c %s (%02x): ", dir,
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(type & KGDB_ACK) ? 'A' : '.',
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(type & KGDB_DELTA) ? 'D' : '.',
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(type & KGDB_MORE) ? 'M' : '.',
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(type & KGDB_SEQ) ? '-' : '+',
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s, type);
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if (buf)
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for (i = 0; i < len; ++i)
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remote_debug("%02x", buf[i]);
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remote_debug("\n");
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}
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static void
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set_remote_text_refs_command(arg, from_tty)
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char *arg;
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int from_tty;
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{
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icache = !parse_binary_operation("set remote-text-refs", arg);
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}
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static void
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remote_debug_command(arg, from_tty)
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char *arg;
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int from_tty;
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{
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char *name;
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if (kiodebug != 0 && kiodebug != stderr)
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(void)fclose(kiodebug);
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if (arg == 0) {
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kiodebug = 0;
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printf("Remote debugging off.\n");
|
|
return;
|
|
}
|
|
if (arg[0] == '-') {
|
|
kiodebug = stderr;
|
|
name = "stderr";
|
|
} else {
|
|
kiodebug = fopen(arg, "w");
|
|
if (kiodebug == 0) {
|
|
printf("Cannot open '%s'.\n", arg);
|
|
return;
|
|
}
|
|
name = arg;
|
|
}
|
|
printf("Remote debugging output routed to %s.\n", name);
|
|
}
|
|
|
|
/* ARGSUSED */
|
|
static void
|
|
remote_info(arg, from_tty)
|
|
char *arg;
|
|
int from_tty;
|
|
{
|
|
printf("Using %s for text references.\n",
|
|
icache? "local executable" : "remote");
|
|
printf("Protocol debugging is %s.\n", kiodebug? "on" : "off");
|
|
printf("%d spurious input messages.\n", remote_spurious);
|
|
printf("%d input errors; %d output errors; %d sequence errors.\n",
|
|
remote_ierrs, remote_oerrs, remote_seqerrs);
|
|
}
|
|
|
|
/* VARARGS */
|
|
static void
|
|
remote_debug(va_alist)
|
|
va_dcl
|
|
{
|
|
register char *cp;
|
|
va_list ap;
|
|
|
|
va_start(ap);
|
|
cp = va_arg(ap, char *);
|
|
(void)vfprintf(kiodebug, cp, ap);
|
|
va_end(ap);
|
|
fflush(kiodebug);
|
|
}
|
|
|
|
extern struct cmd_list_element *setlist;
|
|
|
|
void
|
|
_initialize_remote()
|
|
{
|
|
add_com("remote-signal", class_run, remote_signal_command,
|
|
"If remote debugging, send interrupt signal to remote.");
|
|
add_cmd("remote-text-refs", class_support,
|
|
set_remote_text_refs_command,
|
|
"Enable/disable use of local executable for text segment references.\n\
|
|
If on, all memory read/writes go to remote.\n\
|
|
If off, text segment reads use the local executable.",
|
|
&setlist);
|
|
|
|
add_com("remote-debug", class_run, remote_debug_command,
|
|
"With a file name argument, enables output of remote protocol debugging\n\
|
|
messages to said file. If file is `-', stderr is used.\n\
|
|
With no argument, remote debugging is disabled.");
|
|
|
|
add_info("remote", remote_info,
|
|
"Show current settings of remote debugging options.");
|
|
}
|
|
|