aboutsummaryrefslogtreecommitdiff
path: root/sim/arm/communicate.c
blob: e00b3cfdcbf0b8111948822cac814c47080c3f60 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
/*  communicate.c -- ARMulator RDP comms code:  ARM6 Instruction Emulator.
    Copyright (C) 1994 Advanced RISC Machines Ltd.
 
    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 3 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, see <http://www.gnu.org/licenses/>. */

/**************************************************************************/
/* Functions to read and write characters or groups of characters         */
/* down sockets or pipes.  Those that return a value return -1 on failure */
/* and 0 on success.                                                      */
/**************************************************************************/

#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>

#include "armdefs.h"

/* The socket to the debugger */
int debugsock;

/* The maximum number of file descriptors */
extern int nfds;

/* The socket handle */
extern int sockethandle;

/* Read and Write routines down a pipe or socket */

/****************************************************************/
/* Read an individual character.                                */
/* All other read functions rely on this one.                   */
/* It waits 15 seconds until there is a character available: if */
/* no character is available, then it timeouts and returns -1.  */
/****************************************************************/
int
MYread_char (int sock, unsigned char *c)
{
  int i;
  fd_set readfds;
  struct timeval timeout = { 15, 0 };
  struct sockaddr_in isa;

retry:

  FD_ZERO (&readfds);
  FD_SET (sock, &readfds);

  i = select (nfds, &readfds, (fd_set *) 0, (fd_set *) 0, &timeout);

  if (i < 0)
    {
      perror ("select");
      exit (1);
    }

  if (!i)
    {
      fprintf (stderr, "read: Timeout\n");
      return -1;
    }

  if ((i = read (sock, c, 1)) < 1)
    {
      if (!i && sock == debugsock)
	{
	  fprintf (stderr, "Connection with debugger severed.\n");
	  /* This shouldn't be necessary for a detached armulator, but
	     the armulator cannot be cold started a second time, so
	     this is probably preferable to locking up.  */
	  return -1;
	  fprintf (stderr, "Waiting for connection from debugger...");
	  debugsock = accept (sockethandle, &isa, &i);
	  if (debugsock == -1)
	    {			/* Now we are in serious trouble... */
	      perror ("accept");
	      return -1;
	    }
	  fprintf (stderr, " done.\nConnection Established.\n");
	  sock = debugsock;
	  goto retry;
	}
      perror ("read");
      return -1;
    }

#ifdef DEBUG
  if (sock == debugsock)
    fprintf (stderr, "<%02x ", *c);
#endif

  return 0;
}

/****************************************************************/
/* Read an individual character.                                */
/* It waits until there is a character available. Returns -1 if */
/* an error occurs.                                             */
/****************************************************************/
int
MYread_charwait (int sock, unsigned char *c)
{
  int i;
  fd_set readfds;
  struct sockaddr_in isa;

retry:

  FD_ZERO (&readfds);
  FD_SET (sock, &readfds);

  i = select (nfds, &readfds,
	      (fd_set *) 0, (fd_set *) 0, (struct timeval *) 0);

  if (i < 0)
    {
      perror ("select");
      exit (-1);
    }

  if ((i = read (sock, c, 1)) < 1)
    {
      if (!i && sock == debugsock)
	{
	  fprintf (stderr, "Connection with debugger severed.\n");
	  return -1;
	  fprintf (stderr, "Waiting for connection from debugger...");
	  debugsock = accept (sockethandle, &isa, &i);
	  if (debugsock == -1)
	    {			/* Now we are in serious trouble... */
	      perror ("accept");
	      return -1;
	    }
	  fprintf (stderr, " done.\nConnection Established.\n");
	  sock = debugsock;
	  goto retry;
	}
      perror ("read");
      return -1;
    }

#ifdef DEBUG
  if (sock == debugsock)
    fprintf (stderr, "<%02x ", *c);
#endif

  return 0;
}

void
MYwrite_char (int sock, unsigned char c)
{

  if (write (sock, &c, 1) < 1)
    perror ("write");
#ifdef DEBUG
  if (sock == debugsock)
    fprintf (stderr, ">%02x ", c);
#endif
}

int
MYread_word (int sock, ARMword * here)
{
  unsigned char a, b, c, d;

  if (MYread_char (sock, &a) < 0)
    return -1;
  if (MYread_char (sock, &b) < 0)
    return -1;
  if (MYread_char (sock, &c) < 0)
    return -1;
  if (MYread_char (sock, &d) < 0)
    return -1;
  *here = a | b << 8 | c << 16 | d << 24;
  return 0;
}

void
MYwrite_word (int sock, ARMword i)
{
  MYwrite_char (sock, i & 0xff);
  MYwrite_char (sock, (i & 0xff00) >> 8);
  MYwrite_char (sock, (i & 0xff0000) >> 16);
  MYwrite_char (sock, (i & 0xff000000) >> 24);
}

void
MYwrite_string (int sock, char *s)
{
  int i;
  for (i = 0; MYwrite_char (sock, s[i]), s[i]; i++);
}

int
MYread_FPword (int sock, char *putinhere)
{
  int i;
  for (i = 0; i < 16; i++)
    if (MYread_char (sock, &putinhere[i]) < 0)
      return -1;
  return 0;
}

void
MYwrite_FPword (int sock, char *fromhere)
{
  int i;
  for (i = 0; i < 16; i++)
    MYwrite_char (sock, fromhere[i]);
}

/* Takes n bytes from source and those n bytes */
/* down to dest */
int
passon (int source, int dest, int n)
{
  char *p;
  int i;

  p = (char *) malloc (n);
  if (!p)
    {
      perror ("Out of memory\n");
      exit (1);
    }
  if (n)
    {
      for (i = 0; i < n; i++)
	if (MYread_char (source, &p[i]) < 0)
	  return -1;

#ifdef DEBUG
      if (dest == debugsock)
	for (i = 0; i < n; i++)
	  fprintf (stderr, ")%02x ", (unsigned char) p[i]);
#endif

      write (dest, p, n);
    }
  free (p);
  return 0;
}