1 /*-
2 * Copyright (c) 2011 NetApp, Inc.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY NETAPP, INC ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL NETAPP, INC OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 *
26 * $FreeBSD$
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/types.h>
33 #include <sys/socket.h>
34 #include <netinet/in.h>
35 #include <sys/uio.h>
36
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <fcntl.h>
40 #include <unistd.h>
41 #include <errno.h>
42
43 #include "inout.h"
44 #include "dbgport.h"
45 #include "pci_lpc.h"
46
47 #define BVM_DBG_PORT 0x224
48 #define BVM_DBG_SIG ('B' << 8 | 'V')
49
50 static int listen_fd, conn_fd;
51
52 static struct sockaddr_in sin;
53
54 static int
dbg_handler(struct vmctx * ctx,int vcpu,int in,int port,int bytes,uint32_t * eax,void * arg)55 dbg_handler(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
56 uint32_t *eax, void *arg)
57 {
58 char ch;
59 int nwritten, nread, printonce;
60
61 if (bytes == 2 && in) {
62 *eax = BVM_DBG_SIG;
63 return (0);
64 }
65
66 if (bytes != 4)
67 return (-1);
68
69 again:
70 printonce = 0;
71 while (conn_fd < 0) {
72 if (!printonce) {
73 printf("Waiting for connection from gdb\r\n");
74 printonce = 1;
75 }
76 conn_fd = accept(listen_fd, NULL, NULL);
77 if (conn_fd >= 0)
78 fcntl(conn_fd, F_SETFL, O_NONBLOCK);
79 else if (errno != EINTR)
80 perror("accept");
81 }
82
83 if (in) {
84 nread = read(conn_fd, &ch, 1);
85 if (nread == -1 && errno == EAGAIN)
86 *eax = -1;
87 else if (nread == 1)
88 *eax = ch;
89 else {
90 close(conn_fd);
91 conn_fd = -1;
92 goto again;
93 }
94 } else {
95 ch = *eax;
96 nwritten = write(conn_fd, &ch, 1);
97 if (nwritten != 1) {
98 close(conn_fd);
99 conn_fd = -1;
100 goto again;
101 }
102 }
103 return (0);
104 }
105
106 static struct inout_port dbgport = {
107 "bvmdbg",
108 BVM_DBG_PORT,
109 1,
110 IOPORT_F_INOUT,
111 dbg_handler
112 };
113
114 SYSRES_IO(BVM_DBG_PORT, 4);
115
116 void
init_dbgport(int sport)117 init_dbgport(int sport)
118 {
119 int reuse;
120
121 conn_fd = -1;
122
123 if ((listen_fd = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
124 perror("socket");
125 exit(1);
126 }
127
128 sin.sin_len = sizeof(sin);
129 sin.sin_family = AF_INET;
130 sin.sin_addr.s_addr = htonl(INADDR_ANY);
131 sin.sin_port = htons(sport);
132
133 reuse = 1;
134 if (setsockopt(listen_fd, SOL_SOCKET, SO_REUSEADDR, &reuse,
135 sizeof(reuse)) < 0) {
136 perror("setsockopt");
137 exit(1);
138 }
139
140 if (bind(listen_fd, (struct sockaddr *)&sin, sizeof(sin)) < 0) {
141 perror("bind");
142 exit(1);
143 }
144
145 if (listen(listen_fd, 1) < 0) {
146 perror("listen");
147 exit(1);
148 }
149
150 register_inout(&dbgport);
151 }
152