aboutsummaryrefslogtreecommitdiff
path: root/gdb/ppc-bdm.c
blob: f20918e11915fb8855c54251b2891f398cf6c0f8 (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
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
/* Remote target communications for the Macraigor Systems BDM Wiggler
   talking to a Motorola PPC 8xx ADS board
   Copyright 1996, 1997, 1998, 1999, 2000, 2001
   Free Software Foundation, Inc.

   This file is part of GDB.

   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 2 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, write to the Free Software
   Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include "defs.h"
#include "gdbcore.h"
#include "gdb_string.h"
#include <fcntl.h>
#include "frame.h"
#include "inferior.h"
#include "bfd.h"
#include "symfile.h"
#include "target.h"
#include "gdbcmd.h"
#include "objfiles.h"
#include "gdb-stabs.h"
#include <sys/types.h>
#include "serial.h"
#include "ocd.h"
#include "ppc-tdep.h"
#include "regcache.h"

static void bdm_ppc_open (char *name, int from_tty);

static ptid_t bdm_ppc_wait (ptid_t ptid,
                            struct target_waitstatus *target_status);

static void bdm_ppc_fetch_registers (int regno);

static void bdm_ppc_store_registers (int regno);

extern struct target_ops bdm_ppc_ops;	/* Forward decl */

/*#define BDM_NUM_REGS 71 */
#define BDM_NUM_REGS 24

#define BDM_REGMAP \
	2048, 2049, 2050, 2051, 2052, 2053, 2054, 2055, /* r0-r7 */ \
	2056, 2057, 2058, 2059, 2060, 2061, 2062, 2063, /* r8-r15 */ \
	2064, 2065, 2066, 2067, 2068, 2069, 2070, 2071, /* r16-r23 */ \
	2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, /* r24-r31 */ \
\
	2080, 2082, 2084, 2086, 2088, 2090, 2092, 2094, /* fp0->fp8 */ \
	2096, 2098, 2100, 2102, 2104, 2106, 2108, 2110, /* fp0->fp8 */ \
	2112, 2114, 2116, 2118, 2120, 2122, 2124, 2126, /* fp0->fp8 */ \
	2128, 2130, 2132, 2134, 2136, 2138, 2140, 2142, /* fp0->fp8 */ \
\
	26,        /* pc (SRR0 (SPR 26)) */ \
	2146,      /* ps (MSR) */ \
	2144,      /* cnd (CR) */ \
	8,         /* lr (SPR 8) */ \
	9,         /* cnt (CTR (SPR 9)) */ \
	1,         /* xer (SPR 1) */ \
	0,			/* mq (SPR 0) */


char nowatchdog[4] =
{0xff, 0xff, 0xff, 0x88};

/* Open a connection to a remote debugger.
   NAME is the filename used for communication.  */

static void
bdm_ppc_open (char *name, int from_tty)
{
  CORE_ADDR watchdogaddr = 0xff000004;

  ocd_open (name, from_tty, OCD_TARGET_MOTO_PPC, &bdm_ppc_ops);

  /* We want interrupts to drop us into debugging mode. */
  /* Modify the DER register to accomplish this. */
  ocd_write_bdm_register (149, 0x20024000);

  /* Disable watchdog timer on the board */
  ocd_write_bytes (watchdogaddr, nowatchdog, 4);
}

/* Wait until the remote machine stops, then return,
   storing status in STATUS just as `wait' would.
   Returns "pid" (though it's not clear what, if anything, that
   means in the case of this target).  */

static ptid_t
bdm_ppc_wait (ptid_t ptid, struct target_waitstatus *target_status)
{
  int stop_reason;

  target_status->kind = TARGET_WAITKIND_STOPPED;

  stop_reason = ocd_wait ();

  if (stop_reason)
    {
      target_status->value.sig = TARGET_SIGNAL_INT;
      return inferior_ptid;
    }

  target_status->value.sig = TARGET_SIGNAL_TRAP;	/* XXX for now */

#if 0
  {
    unsigned long ecr, der;

    ecr = ocd_read_bdm_register (148);	/* Read the exception cause register */
    der = ocd_read_bdm_register (149);	/* Read the debug enables register */
    fprintf_unfiltered (gdb_stdout, "ecr = 0x%x, der = 0x%x\n", ecr, der);
  }
#endif

  return inferior_ptid;
}

static int bdm_regmap[] =
{BDM_REGMAP};

/* Read the remote registers into regs.
   Fetch register REGNO, or all registers if REGNO == -1

   The Wiggler uses the following codes to access the registers:

   0 -> 1023            SPR 0 -> 1023
   0 - SPR 0 - MQ
   1 - SPR 1 - XER
   8 - SPR 8 - LR
   9 - SPR 9 - CTR (known as cnt in GDB)
   26 - SPR 26 - SRR0 - pc
   1024 -> 2047         DCR 0 -> DCR 1023 (IBM PPC 4xx only)
   2048 -> 2079         R0 -> R31
   2080 -> 2143         FP0 -> FP31 (64 bit regs) (IBM PPC 5xx only)
   2144                 CR (known as cnd in GDB)
   2145                 FPCSR
   2146                 MSR (known as ps in GDB)
 */

static void
bdm_ppc_fetch_registers (int regno)
{
  int i;
  unsigned char *regs, *beginregs, *endregs, *almostregs;
  unsigned char midregs[32];
  unsigned char mqreg[1];
  int first_regno, last_regno;
  int first_bdm_regno, last_bdm_regno;
  int reglen, beginreglen, endreglen;

#if 1
  for (i = 0; i < (FPLAST_REGNUM - FP0_REGNUM + 1); i++)
    {
      midregs[i] = -1;
    }
  mqreg[0] = -1;
#endif

  if (regno == -1)
    {
      first_regno = 0;
      last_regno = NUM_REGS - 1;

      first_bdm_regno = 0;
      last_bdm_regno = BDM_NUM_REGS - 1;
    }
  else
    {
      first_regno = regno;
      last_regno = regno;

      first_bdm_regno = bdm_regmap[regno];
      last_bdm_regno = bdm_regmap[regno];
    }

  if (first_bdm_regno == -1)
    {
      supply_register (first_regno, NULL);
      return;			/* Unsupported register */
    }

#if 1
  /* Can't ask for floating point regs on ppc 8xx, also need to
     avoid asking for the mq register. */
  if (first_regno == last_regno)	/* only want one reg */
    {
/*      printf("Asking for register %d\n", first_regno); */

      /* if asking for an invalid register */
      if ((first_regno == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
          || (first_regno == gdbarch_tdep (current_gdbarch)->fpscr_regnum)
	  || ((first_regno >= FP0_REGNUM) && (first_regno <= FPLAST_REGNUM)))
	{
/*          printf("invalid reg request!\n"); */
	  supply_register (first_regno, NULL);
	  return;		/* Unsupported register */
	}
      else
	{
	  regs = ocd_read_bdm_registers (first_bdm_regno,
					 last_bdm_regno, &reglen);
	}
    }
  else
    /* want all regs */
    {
/*      printf("Asking for registers %d to %d\n", first_regno, last_regno); */
      beginregs = ocd_read_bdm_registers (first_bdm_regno,
					  FP0_REGNUM - 1, &beginreglen);
      endregs = (strcat (midregs,
			 ocd_read_bdm_registers (FPLAST_REGNUM + 1,
					  last_bdm_regno - 1, &endreglen)));
      almostregs = (strcat (beginregs, endregs));
      regs = (strcat (almostregs, mqreg));
      reglen = beginreglen + 32 + endreglen + 1;
    }

#endif
#if 0
  regs = ocd_read_bdm_registers (first_bdm_regno, last_bdm_regno, &reglen);
#endif

  for (i = first_regno; i <= last_regno; i++)
    {
      int bdm_regno, regoffset;

      bdm_regno = bdm_regmap[i];
      if (bdm_regno != -1)
	{
	  regoffset = bdm_regno - first_bdm_regno;

	  if (regoffset >= reglen / 4)
	    continue;

	  supply_register (i, regs + 4 * regoffset);
	}
      else
	supply_register (i, NULL);	/* Unsupported register */
    }
}

/* Store register REGNO, or all registers if REGNO == -1, from the contents
   of REGISTERS.  FIXME: ignores errors.  */

static void
bdm_ppc_store_registers (int regno)
{
  int i;
  int first_regno, last_regno;
  int first_bdm_regno, last_bdm_regno;

  if (regno == -1)
    {
      first_regno = 0;
      last_regno = NUM_REGS - 1;

      first_bdm_regno = 0;
      last_bdm_regno = BDM_NUM_REGS - 1;
    }
  else
    {
      first_regno = regno;
      last_regno = regno;

      first_bdm_regno = bdm_regmap[regno];
      last_bdm_regno = bdm_regmap[regno];
    }

  if (first_bdm_regno == -1)
    return;			/* Unsupported register */

  for (i = first_regno; i <= last_regno; i++)
    {
      int bdm_regno;

      bdm_regno = bdm_regmap[i];

      /* only attempt to write if it's a valid ppc 8xx register */
      /* (need to avoid FP regs and MQ reg) */
      if ((i != gdbarch_tdep (current_gdbarch)->ppc_mq_regnum) 
          && (i != gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum) 
          && ((i < FP0_REGNUM) || (i > FPLAST_REGNUM)))
	{
/*          printf("write valid reg %d\n", bdm_regno); */
	  ocd_write_bdm_registers (bdm_regno, registers + REGISTER_BYTE (i), 4);
	}
/*
   else if (i == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
   printf("don't write invalid reg %d (PPC_MQ_REGNUM)\n", bdm_regno);
   else
   printf("don't write invalid reg %d\n", bdm_regno);
 */
    }
}

/* Define the target subroutine names */

struct target_ops bdm_ppc_ops;

static void
init_bdm_ppc_ops (void)
{
  bdm_ppc_ops.to_shortname = "ocd";
  bdm_ppc_ops.to_longname = "Remote target with On-Chip Debugging";
  bdm_ppc_ops.to_doc = "Use a remote target with On-Chip Debugging.  To use a target box;\n\
specify the serial device it is connected to (e.g. /dev/ttya).  To use\n\
a wiggler, specify wiggler and then the port it is connected to\n\
(e.g. wiggler lpt1).";		/* to_doc */
  bdm_ppc_ops.to_open = bdm_ppc_open;
  bdm_ppc_ops.to_close = ocd_close;
  bdm_ppc_ops.to_attach = NULL;
  bdm_ppc_ops.to_post_attach = NULL;
  bdm_ppc_ops.to_require_attach = NULL;
  bdm_ppc_ops.to_detach = ocd_detach;
  bdm_ppc_ops.to_require_detach = NULL;
  bdm_ppc_ops.to_resume = ocd_resume;
  bdm_ppc_ops.to_wait = bdm_ppc_wait;
  bdm_ppc_ops.to_post_wait = NULL;
  bdm_ppc_ops.to_fetch_registers = bdm_ppc_fetch_registers;
  bdm_ppc_ops.to_store_registers = bdm_ppc_store_registers;
  bdm_ppc_ops.to_prepare_to_store = ocd_prepare_to_store;
  bdm_ppc_ops.to_xfer_memory = ocd_xfer_memory;
  bdm_ppc_ops.to_files_info = ocd_files_info;
  bdm_ppc_ops.to_insert_breakpoint = ocd_insert_breakpoint;
  bdm_ppc_ops.to_remove_breakpoint = ocd_remove_breakpoint;
  bdm_ppc_ops.to_terminal_init = NULL;
  bdm_ppc_ops.to_terminal_inferior = NULL;
  bdm_ppc_ops.to_terminal_ours_for_output = NULL;
  bdm_ppc_ops.to_terminal_ours = NULL;
  bdm_ppc_ops.to_terminal_info = NULL;
  bdm_ppc_ops.to_kill = ocd_kill;
  bdm_ppc_ops.to_load = ocd_load;
  bdm_ppc_ops.to_lookup_symbol = NULL;
  bdm_ppc_ops.to_create_inferior = ocd_create_inferior;
  bdm_ppc_ops.to_post_startup_inferior = NULL;
  bdm_ppc_ops.to_acknowledge_created_inferior = NULL;
  bdm_ppc_ops.to_clone_and_follow_inferior = NULL;
  bdm_ppc_ops.to_post_follow_inferior_by_clone = NULL;
  bdm_ppc_ops.to_insert_fork_catchpoint = NULL;
  bdm_ppc_ops.to_remove_fork_catchpoint = NULL;
  bdm_ppc_ops.to_insert_vfork_catchpoint = NULL;
  bdm_ppc_ops.to_remove_vfork_catchpoint = NULL;
  bdm_ppc_ops.to_has_forked = NULL;
  bdm_ppc_ops.to_has_vforked = NULL;
  bdm_ppc_ops.to_can_follow_vfork_prior_to_exec = NULL;
  bdm_ppc_ops.to_post_follow_vfork = NULL;
  bdm_ppc_ops.to_insert_exec_catchpoint = NULL;
  bdm_ppc_ops.to_remove_exec_catchpoint = NULL;
  bdm_ppc_ops.to_has_execd = NULL;
  bdm_ppc_ops.to_reported_exec_events_per_exec_call = NULL;
  bdm_ppc_ops.to_has_exited = NULL;
  bdm_ppc_ops.to_mourn_inferior = ocd_mourn;
  bdm_ppc_ops.to_can_run = 0;
  bdm_ppc_ops.to_notice_signals = 0;
  bdm_ppc_ops.to_thread_alive = ocd_thread_alive;
  bdm_ppc_ops.to_stop = ocd_stop;
  bdm_ppc_ops.to_pid_to_exec_file = NULL;
  bdm_ppc_ops.to_stratum = process_stratum;
  bdm_ppc_ops.DONT_USE = NULL;
  bdm_ppc_ops.to_has_all_memory = 1;
  bdm_ppc_ops.to_has_memory = 1;
  bdm_ppc_ops.to_has_stack = 1;
  bdm_ppc_ops.to_has_registers = 1;
  bdm_ppc_ops.to_has_execution = 1;
  bdm_ppc_ops.to_sections = NULL;
  bdm_ppc_ops.to_sections_end = NULL;
  bdm_ppc_ops.to_magic = OPS_MAGIC;
}				/* init_bdm_ppc_ops */

void
_initialize_bdm_ppc (void)
{
  init_bdm_ppc_ops ();
  add_target (&bdm_ppc_ops);
}