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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [sim/] [arm/] [parent.c] - Blame information for rev 298

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1 24 jeremybenn 
/*  parent.c -- ARMulator RDP comms code:  ARM6 Instruction Emulator.
2 
    Copyright (C) 1994 Advanced RISC Machines Ltd.
3 
 
4 
    This program is free software; you can redistribute it and/or modify
5 
    it under the terms of the GNU General Public License as published by
6 
    the Free Software Foundation; either version 2 of the License, or
7 
    (at your option) any later version.
8 
 
9 
    This program is distributed in the hope that it will be useful,
10 
    but WITHOUT ANY WARRANTY; without even the implied warranty of
11 
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12 
    GNU General Public License for more details.
13 
 
14 
    You should have received a copy of the GNU General Public License
15 
    along with this program; if not, write to the Free Software
16 
    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. */
17 
 
18 
/*****************************************************************/
19 
/* The Parent process continues here...                          */
20 
/* It waits on the socket and passes on RDP messages down a pipe */
21 
/* to the ARMulator RDP to RDI interpreter.                      */
22 
/*****************************************************************/
23 
 
24 
#include <stdio.h>
25 
#include <sys/types.h>
26 
#include <signal.h>
27 
#include "time.h"
28 
#include "armdefs.h"
29 
#include "dbg_rdi.h"
30 
#include "communicate.h"
31 
 
32 
/* The socket to the debugger */
33 
extern int debugsock;
34 
 
35 
/* The pipes between the two processes */
36 
extern int mumkid[2];
37 
extern int kidmum[2];
38 
 
39 
/* A pipe for handling SWI return values that goes straight from the */
40 
/* parent to the ARMulator host interface, bypassing the child's RDP */
41 
/* to RDI interpreter */
42 
extern int DebuggerARMul[2];
43 
 
44 
/* The maximum number of file descriptors */
45 
extern int nfds;
46 
 
47 
/* The child process id. */
48 
extern pid_t child;
49 
 
50 
void
51 
parent ()
52 
{
53 
  int i, j, k;
54 
  unsigned char message, CPnum, exreturn;
55 
  ARMword mask, nbytes, messagetype;
56 
  unsigned char c, d;
57 
  ARMword x, y;
58 
  int virgin = 1;
59 
  struct fd_set readfds;
60 
 
61 
#ifdef DEBUG
62 
  fprintf (stderr, "parent ()...\n");
63 
#endif
64 
 
65 
panic_error:
66 
 
67 
  if (!virgin)
68 
    {
69 
#ifdef DEBUG
70 
      fprintf (stderr, "Arghh! What is going on?\n");
71 
#endif
72 
      kill (child, SIGHUP);
73 
      MYwrite_char (debugsock, RDP_Reset);
74 
    }
75 
 
76 
  virgin = 0;
77 
 
78 
  while (1)
79 
    {
80 
 
81 
      /* Wait either for the ARMulator or the debugger */
82 
 
83 
      FD_ZERO (&readfds);
84 
      FD_SET (kidmum[0], &readfds);      /* Wait for messages from ARMulator */
85 
      FD_SET (debugsock, &readfds);     /* Wait for messages from debugger */
86 
 
87 
#ifdef DEBUG
88 
      fprintf (stderr, "Waiting for ARMulator or debugger... ");
89 
#endif
90 
 
91 
      while ((i = select (nfds, &readfds, (fd_set *) 0, (fd_set *) 0, 0)) < 0)
92 
        {
93 
          perror ("select");
94 
        }
95 
 
96 
#ifdef DEBUG
97 
      fprintf (stderr, "(%d/2)", i);
98 
#endif
99 
 
100 
      if (FD_ISSET (debugsock, &readfds))
101 
        {
102 
#ifdef DEBUG
103 
          fprintf (stderr, "->debugger\n");
104 
#endif
105 
 
106 
          /* Inside this rather large if statement with simply pass on a complete
107 
             message to the ARMulator.  The reason we need to pass messages on one
108 
             at a time is that we have to know whether the message is an OSOpReply
109 
             or an info(stop), so that we can take different action in those
110 
             cases. */
111 
 
112 
          if (MYread_char (debugsock, &message))
113 
            goto panic_error;
114 
 
115 
          switch (message)
116 
            {
117 
            case RDP_Start:
118 
              /* Open and/or Initialise */
119 
#ifdef DEBUG
120 
              fprintf (stderr, "RDP Open\n");
121 
#endif
122 
              if (MYread_char (debugsock, &c))  /* type */
123 
                goto panic_error;
124 
 
125 
              if (MYread_word (debugsock, &x))  /* memory size */
126 
                goto panic_error;
127 
 
128 
              MYwrite_char (mumkid[1], message);
129 
              MYwrite_char (mumkid[1], c);
130 
              MYwrite_word (mumkid[1], x);
131 
              if (c & 0x2)
132 
                {
133 
                  passon (debugsock, mumkid[1], 1);     /* speed */
134 
                }
135 
              break;
136 
 
137 
            case RDP_End:
138 
              /* Close and Finalise */
139 
#ifdef DEBUG
140 
              fprintf (stderr, "RDP Close\n");
141 
#endif
142 
              MYwrite_char (mumkid[1], message);
143 
              break;
144 
 
145 
            case RDP_Read:
146 
              /* Read Memory Address */
147 
#ifdef DEBUG
148 
              fprintf (stderr, "RDP Read Memory\n");
149 
#endif
150 
              MYwrite_char (mumkid[1], message);
151 
              if (passon (debugsock, mumkid[1], 4))
152 
                goto panic_error;       /* address */
153 
              if (MYread_word (debugsock, &nbytes))
154 
                goto panic_error;       /* nbytes */
155 
              MYwrite_word (mumkid[1], nbytes);
156 
              break;
157 
 
158 
            case RDP_Write:
159 
              /* Write Memory Address */
160 
#ifdef DEBUG
161 
              fprintf (stderr, "RDP Write Memory\n");
162 
#endif
163 
              if (MYread_word (debugsock, &x))
164 
                goto panic_error;       /* address */
165 
 
166 
              if (MYread_word (debugsock, &y))
167 
                goto panic_error;       /* nbytes */
168 
 
169 
              MYwrite_char (mumkid[1], message);
170 
              MYwrite_word (mumkid[1], x);
171 
              MYwrite_word (mumkid[1], y);
172 
              passon (debugsock, mumkid[1], y); /* actual data */
173 
              break;
174 
 
175 
            case RDP_CPUread:
176 
              /* Read CPU State */
177 
#ifdef DEBUG
178 
              fprintf (stderr, "RDP Read CPU\n");
179 
#endif
180 
              if (MYread_char (debugsock, &c))
181 
                goto panic_error;       /* mode */
182 
 
183 
              if (MYread_word (debugsock, &mask))
184 
                goto panic_error;       /* mask */
185 
 
186 
              MYwrite_char (mumkid[1], message);
187 
              MYwrite_char (mumkid[1], c);
188 
              MYwrite_word (mumkid[1], mask);
189 
              break;
190 
 
191 
            case RDP_CPUwrite:
192 
              /* Write CPU State */
193 
#ifdef DEBUG
194 
              fprintf (stderr, "RDP Write CPU\n");
195 
#endif
196 
              if (MYread_char (debugsock, &c))
197 
                goto panic_error;       /* mode */
198 
 
199 
              if (MYread_word (debugsock, &x))
200 
                goto panic_error;       /* mask */
201 
 
202 
              MYwrite_char (mumkid[1], message);
203 
              MYwrite_char (mumkid[1], c);
204 
              MYwrite_word (mumkid[1], x);
205 
              for (k = 1, j = 0; k != 0x80000000; k *= 2, j++)
206 
                if ((k & x) && passon (debugsock, mumkid[1], 4))
207 
                  goto panic_error;
208 
              break;
209 
 
210 
            case RDP_CPread:
211 
              /* Read Co-Processor State */
212 
#ifdef DEBUG
213 
              fprintf (stderr, "RDP Read CP state\n");
214 
#endif
215 
              if (MYread_char (debugsock, &CPnum))
216 
                goto panic_error;
217 
 
218 
              if (MYread_word (debugsock, &mask))
219 
                goto panic_error;
220 
 
221 
              MYwrite_char (mumkid[1], message);
222 
              MYwrite_char (mumkid[1], CPnum);
223 
              MYwrite_word (mumkid[1], mask);
224 
              break;
225 
 
226 
            case RDP_CPwrite:
227 
              /* Write Co-Processor State */
228 
#ifdef DEBUG
229 
              fprintf (stderr, "RDP Write CP state\n");
230 
#endif
231 
              if (MYread_char (debugsock, &CPnum))
232 
                goto panic_error;
233 
 
234 
              if (MYread_word (debugsock, &mask))
235 
                goto panic_error;
236 
 
237 
              MYwrite_char (mumkid[1], message);
238 
              MYwrite_char (mumkid[1], c);
239 
              MYwrite_char (mumkid[1], x);
240 
              for (k = 1, j = 0; k != 0x80000000; k *= 2, j++)
241 
                if (k & x)
242 
                  {
243 
                    if ((c == 1 || c == 2) && k <= 128)
244 
                      {
245 
                        /* FP register = 12 bytes + 4 bytes format */
246 
                        if (passon (debugsock, mumkid[1], 16))
247 
                          goto panic_error;
248 
                      }
249 
                    else
250 
                      {
251 
                        /* Normal register = 4 bytes */
252 
                        if (passon (debugsock, mumkid[1], 4))
253 
                          goto panic_error;
254 
                      }
255 
                  }
256 
              break;
257 
 
258 
            case RDP_SetBreak:
259 
              /* Set Breakpoint */
260 
#ifdef DEBUG
261 
              fprintf (stderr, "RDP Set Breakpoint\n");
262 
#endif
263 
              if (MYread_word (debugsock, &x))
264 
                goto panic_error;       /* address */
265 
 
266 
              if (MYread_char (debugsock, &c))
267 
                goto panic_error;       /* type */
268 
 
269 
              MYwrite_char (mumkid[1], message);
270 
              MYwrite_word (mumkid[1], x);
271 
              MYwrite_char (mumkid[1], c);
272 
              if (((c & 0xf) >= 5) && passon (debugsock, mumkid[1], 4))
273 
                goto panic_error;       /* bound */
274 
              break;
275 
 
276 
            case RDP_ClearBreak:
277 
              /* Clear Breakpoint */
278 
#ifdef DEBUG
279 
              fprintf (stderr, "RDP Clear Breakpoint\n");
280 
#endif
281 
              MYwrite_char (mumkid[1], message);
282 
              if (passon (debugsock, mumkid[1], 4))
283 
                goto panic_error;       /* point */
284 
              break;
285 
 
286 
            case RDP_SetWatch:
287 
              /* Set Watchpoint */
288 
#ifdef DEBUG
289 
              fprintf (stderr, "RDP Set Watchpoint\n");
290 
#endif
291 
              if (MYread_word (debugsock, &x))
292 
                goto panic_error;       /* address */
293 
 
294 
              if (MYread_char (debugsock, &c))
295 
                goto panic_error;       /* type */
296 
 
297 
              if (MYread_char (debugsock, &d))
298 
                goto panic_error;       /* datatype */
299 
 
300 
              MYwrite_char (mumkid[1], message);
301 
              MYwrite_word (mumkid[1], x);
302 
              MYwrite_char (mumkid[1], c);
303 
              MYwrite_char (mumkid[1], d);
304 
              if (((c & 0xf) >= 5) && passon (debugsock, mumkid[1], 4))
305 
                goto panic_error;       /* bound */
306 
              break;
307 
 
308 
            case RDP_ClearWatch:
309 
              /* Clear Watchpoint */
310 
#ifdef DEBUG
311 
              fprintf (stderr, "RDP Clear Watchpoint\n");
312 
#endif
313 
              MYwrite_char (mumkid[1], message);
314 
              if (passon (debugsock, mumkid[1], 4))
315 
                goto panic_error;       /* point */
316 
              break;
317 
 
318 
            case RDP_Execute:
319 
              /* Excecute */
320 
#ifdef DEBUG
321 
              fprintf (stderr, "RDP Execute\n");
322 
#endif
323 
 
324 
              /* LEAVE THIS ONE 'TIL LATER... */
325 
              /* NEED TO WORK THINGS OUT */
326 
 
327 
              /* NO ASCYNCHROUS RUNNING */
328 
 
329 
              if (MYread_char (debugsock, &c))
330 
                goto panic_error;       /* return */
331 
 
332 
              /* Remember incase bit 7 is set and we have to send back a word */
333 
              exreturn = c;
334 
 
335 
              MYwrite_char (mumkid[1], message);
336 
              MYwrite_char (mumkid[1], c);
337 
              break;
338 
 
339 
            case RDP_Step:
340 
              /* Step */
341 
#ifdef DEBUG
342 
              fprintf (stderr, "RDP Step\n");
343 
#endif
344 
 
345 
              if (MYread_char (debugsock, &c))
346 
                goto panic_error;       /* return */
347 
 
348 
              if (MYread_word (debugsock, &x))
349 
                goto panic_error;       /* ninstr */
350 
 
351 
              MYwrite_char (mumkid[1], message);
352 
              MYwrite_char (mumkid[1], c);
353 
              MYwrite_word (mumkid[1], x);
354 
              break;
355 
 
356 
            case RDP_Info:
357 
              /* Info */
358 
#ifdef DEBUG
359 
              fprintf (stderr, "RDP Info\n");
360 
#endif
361 
              /* INFO TARGET, SET RDI LEVEL */
362 
              if (MYread_word (debugsock, &messagetype))
363 
                goto panic_error;       /* info */
364 
 
365 
              switch (messagetype)
366 
                {
367 
                case RDIInfo_Target:
368 
                  MYwrite_char (mumkid[1], message);
369 
                  MYwrite_word (mumkid[1], messagetype);
370 
                  break;
371 
 
372 
                case RDISet_RDILevel:
373 
                  MYwrite_char (mumkid[1], message);
374 
                  MYwrite_word (mumkid[1], messagetype);
375 
                  if (passon (debugsock, mumkid[1], 1))
376 
                    goto panic_error;   /* argument */
377 
                  break;
378 
 
379 
                case RDISet_Cmdline:
380 
                  /* Got to pass on a string argument */
381 
                  MYwrite_char (mumkid[1], message);
382 
                  MYwrite_word (mumkid[1], messagetype);
383 
                  do
384 
                    {
385 
                      if (MYread_char (debugsock, &c))
386 
                        goto panic_error;
387 
 
388 
                      MYwrite_char (mumkid[1], c);
389 
                    }
390 
                  while (c);
391 
                  break;
392 
 
393 
                case RDISignal_Stop:
394 
                  kill (child, SIGUSR1);
395 
                  MYwrite_char (debugsock, RDP_Return);
396 
                  MYwrite_char (debugsock, RDIError_UserInterrupt);
397 
                  break;
398 
 
399 
                case RDIVector_Catch:
400 
                  MYread_word (debugsock, &x);
401 
                  MYwrite_char (mumkid[1], message);
402 
                  MYwrite_word (mumkid[1], messagetype);
403 
                  MYwrite_word (mumkid[1], x);
404 
                  break;
405 
 
406 
                case RDIInfo_Step:
407 
                  MYwrite_char (mumkid[1], message);
408 
                  MYwrite_word (mumkid[1], messagetype);
409 
                  break;
410 
 
411 
                case RDIInfo_Points:
412 
                  MYwrite_char (mumkid[1], message);
413 
                  MYwrite_word (mumkid[1], messagetype);
414 
                  break;
415 
 
416 
                default:
417 
                  fprintf (stderr, "Unrecognized RDIInfo request %d\n",
418 
                           messagetype);
419 
                  goto panic_error;
420 
                }
421 
              break;
422 
 
423 
            case RDP_OSOpReply:
424 
              /* OS Operation Reply */
425 
#ifdef DEBUG
426 
              fprintf (stderr, "RDP OS Reply\n");
427 
#endif
428 
              MYwrite_char (mumkid[1], message);
429 
              if (MYread_char (debugsock, &message))
430 
                goto panic_error;
431 
              MYwrite_char (mumkid[1], message);
432 
              switch (message)
433 
                {
434 
                case 0:  /* return value i.e. nothing else. */
435 
                  break;
436 
 
437 
                case 1: /* returns a byte... */
438 
                  if (MYread_char (debugsock, &c))
439 
                    goto panic_error;
440 
 
441 
                  MYwrite_char (mumkid[1], c);
442 
                  break;
443 
 
444 
                case 2: /* returns a word... */
445 
                  if (MYread_word (debugsock, &x))
446 
                    goto panic_error;
447 
 
448 
                  MYwrite_word (mumkid[1], x);
449 
                  break;
450 
                }
451 
              break;
452 
 
453 
            case RDP_Reset:
454 
              /* Reset */
455 
#ifdef DEBUG
456 
              fprintf (stderr, "RDP Reset\n");
457 
#endif
458 
              MYwrite_char (mumkid[1], message);
459 
              break;
460 
 
461 
            default:
462 
              /* Hmm.. bad RDP operation */
463 
              fprintf (stderr, "RDP Bad RDP request (%d)\n", message);
464 
              MYwrite_char (debugsock, RDP_Return);
465 
              MYwrite_char (debugsock, RDIError_UnimplementedMessage);
466 
              break;
467 
            }
468 
        }
469 
 
470 
      if (FD_ISSET (kidmum[0], &readfds))
471 
        {
472 
#ifdef DEBUG
473 
          fprintf (stderr, "->ARMulator\n");
474 
#endif
475 
          /* Anything we get from the ARMulator has to go to the debugger... */
476 
          /* It is that simple! */
477 
 
478 
          passon (kidmum[0], debugsock, 1);
479 
        }
480 
    }
481 
}

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