139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/*-
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* Copyright (c) 2011 NetApp, Inc.
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* All rights reserved.
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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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*
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* THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``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 NETAPP, INC 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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* $FreeBSD$
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <sys/uio.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <errno.h>
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#include "inout.h"
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#include "dbgport.h"
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#define BVM_DBG_PORT 0x224
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#define BVM_DBG_SIG ('B' << 8 | 'V')
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static int listen_fd, conn_fd;
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static struct sockaddr_in sin;
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static int
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dbg_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
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uint32_t *eax, void *arg)
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{
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char ch;
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int nwritten, nread, printonce;
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if (bytes == 2 && in) {
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*eax = BVM_DBG_SIG;
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return (0);
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}
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if (bytes != 4)
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return (-1);
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again:
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printonce = 0;
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while (conn_fd < 0) {
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if (!printonce) {
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printf("Waiting for connection from gdb\r\n");
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printonce = 1;
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}
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conn_fd = accept(listen_fd, NULL, NULL);
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if (conn_fd >= 0)
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fcntl(conn_fd, F_SETFL, O_NONBLOCK);
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else if (errno != EINTR)
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perror("accept");
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}
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if (in) {
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nread = read(conn_fd, &ch, 1);
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if (nread == -1 && errno == EAGAIN)
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*eax = -1;
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else if (nread == 1)
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*eax = ch;
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else {
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close(conn_fd);
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conn_fd = -1;
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goto again;
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}
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} else {
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ch = *eax;
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nwritten = write(conn_fd, &ch, 1);
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if (nwritten != 1) {
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close(conn_fd);
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conn_fd = -1;
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goto again;
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}
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}
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return (0);
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}
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static struct inout_port dbgport = {
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"bvmdbg",
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BVM_DBG_PORT,
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IOPORT_F_INOUT,
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dbg_handler
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};
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void
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init_dbgport(int sport)
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{
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conn_fd = -1;
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if ((listen_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
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perror("socket");
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exit(1);
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}
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sin.sin_len = sizeof(sin);
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sin.sin_family = AF_INET;
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sin.sin_addr.s_addr = htonl(INADDR_ANY);
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sin.sin_port = htons(sport);
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if (bind(listen_fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
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perror("bind");
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exit(1);
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}
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if (listen(listen_fd, 1) < 0) {
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perror("listen");
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exit(1);
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}
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register_inout(&dbgport);
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}
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