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1 /* Remote target communications for the Macraigor Systems BDM Wiggler
2 talking to a Motorola PPC 8xx ADS board
3 Copyright 1996, 1997 Free Software Foundation, Inc.
4
5 This file is part of GDB.
6
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
11
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 59 Temple Place - Suite 330,
20 Boston, MA 02111-1307, USA. */
21
22 #include "defs.h"
23 #include "gdbcore.h"
24 #include "gdb_string.h"
25 #include <fcntl.h>
26 #include "frame.h"
27 #include "inferior.h"
28 #include "bfd.h"
29 #include "symfile.h"
30 #include "target.h"
31 #include "wait.h"
32 #include "gdbcmd.h"
33 #include "objfiles.h"
34 #include "gdb-stabs.h"
35 #include <sys/types.h>
36 #include <signal.h>
37 #include "serial.h"
38 #include "ocd.h"
39
40 static void bdm_ppc_open PARAMS ((char *name, int from_tty));
41
42 static int bdm_ppc_wait PARAMS ((int pid,
43 struct target_waitstatus * target_status));
44
45 static void bdm_ppc_fetch_registers PARAMS ((int regno));
46
47 static void bdm_ppc_store_registers PARAMS ((int regno));
48
49 extern struct target_ops bdm_ppc_ops; /* Forward decl */
50 \f
51 /*#define BDM_NUM_REGS 71 */
52 #define BDM_NUM_REGS 24
53
54 #define BDM_REGMAP \
55 2048, 2049, 2050, 2051, 2052, 2053, 2054, 2055, /* r0-r7 */ \
56 2056, 2057, 2058, 2059, 2060, 2061, 2062, 2063, /* r8-r15 */ \
57 2064, 2065, 2066, 2067, 2068, 2069, 2070, 2071, /* r16-r23 */ \
58 2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, /* r24-r31 */ \
59 \
60 2080, 2082, 2084, 2086, 2088, 2090, 2092, 2094, /* fp0->fp8 */ \
61 2096, 2098, 2100, 2102, 2104, 2106, 2108, 2110, /* fp0->fp8 */ \
62 2112, 2114, 2116, 2118, 2120, 2122, 2124, 2126, /* fp0->fp8 */ \
63 2128, 2130, 2132, 2134, 2136, 2138, 2140, 2142, /* fp0->fp8 */ \
64 \
65 26, /* pc (SRR0 (SPR 26)) */ \
66 2146, /* ps (MSR) */ \
67 2144, /* cnd (CR) */ \
68 8, /* lr (SPR 8) */ \
69 9, /* cnt (CTR (SPR 9)) */ \
70 1, /* xer (SPR 1) */ \
71 0, /* mq (SPR 0) */
72 \f
73
74 char nowatchdog[4] =
75 {0xff, 0xff, 0xff, 0x88};
76
77 /* Open a connection to a remote debugger.
78 NAME is the filename used for communication. */
79
80 static void
81 bdm_ppc_open (name, from_tty)
82 char *name;
83 int from_tty;
84 {
85 CORE_ADDR watchdogaddr = 0xff000004;
86
87 ocd_open (name, from_tty, OCD_TARGET_MOTO_PPC, &bdm_ppc_ops);
88
89 /* We want interrupts to drop us into debugging mode. */
90 /* Modify the DER register to accomplish this. */
91 ocd_write_bdm_register (149, 0x20024000);
92
93 /* Disable watchdog timer on the board */
94 ocd_write_bytes (watchdogaddr, nowatchdog, 4);
95 }
96
97 /* Wait until the remote machine stops, then return,
98 storing status in STATUS just as `wait' would.
99 Returns "pid" (though it's not clear what, if anything, that
100 means in the case of this target). */
101
102 static int
103 bdm_ppc_wait (pid, target_status)
104 int pid;
105 struct target_waitstatus *target_status;
106 {
107 int stop_reason;
108
109 target_status->kind = TARGET_WAITKIND_STOPPED;
110
111 stop_reason = ocd_wait ();
112
113 if (stop_reason)
114 {
115 target_status->value.sig = TARGET_SIGNAL_INT;
116 return inferior_pid;
117 }
118
119 target_status->value.sig = TARGET_SIGNAL_TRAP; /* XXX for now */
120
121 #if 0
122 {
123 unsigned long ecr, der;
124
125 ecr = ocd_read_bdm_register (148); /* Read the exception cause register */
126 der = ocd_read_bdm_register (149); /* Read the debug enables register */
127 fprintf_unfiltered (gdb_stdout, "ecr = 0x%x, der = 0x%x\n", ecr, der);
128 }
129 #endif
130
131 return inferior_pid;
132 }
133 \f
134 static int bdm_regmap[] =
135 {BDM_REGMAP};
136
137 /* Read the remote registers into regs.
138 Fetch register REGNO, or all registers if REGNO == -1
139
140 The Wiggler uses the following codes to access the registers:
141
142 0 -> 1023 SPR 0 -> 1023
143 0 - SPR 0 - MQ
144 1 - SPR 1 - XER
145 8 - SPR 8 - LR
146 9 - SPR 9 - CTR (known as cnt in GDB)
147 26 - SPR 26 - SRR0 - pc
148 1024 -> 2047 DCR 0 -> DCR 1023 (IBM PPC 4xx only)
149 2048 -> 2079 R0 -> R31
150 2080 -> 2143 FP0 -> FP31 (64 bit regs) (IBM PPC 5xx only)
151 2144 CR (known as cnd in GDB)
152 2145 FPCSR
153 2146 MSR (known as ps in GDB)
154 */
155
156 static void
157 bdm_ppc_fetch_registers (regno)
158 int regno;
159 {
160 int i;
161 unsigned char *regs, *beginregs, *endregs, *almostregs;
162 unsigned char midregs[32];
163 unsigned char mqreg[1];
164 int first_regno, last_regno;
165 int first_bdm_regno, last_bdm_regno;
166 int reglen, beginreglen, endreglen;
167
168 #if 1
169 for (i = 0; i < (FPLAST_REGNUM - FP0_REGNUM + 1); i++)
170 {
171 midregs[i] = -1;
172 }
173 mqreg[0] = -1;
174 #endif
175
176 if (regno == -1)
177 {
178 first_regno = 0;
179 last_regno = NUM_REGS - 1;
180
181 first_bdm_regno = 0;
182 last_bdm_regno = BDM_NUM_REGS - 1;
183 }
184 else
185 {
186 first_regno = regno;
187 last_regno = regno;
188
189 first_bdm_regno = bdm_regmap[regno];
190 last_bdm_regno = bdm_regmap[regno];
191 }
192
193 if (first_bdm_regno == -1)
194 {
195 supply_register (first_regno, NULL);
196 return; /* Unsupported register */
197 }
198
199 #if 1
200 /* Can't ask for floating point regs on ppc 8xx, also need to
201 avoid asking for the mq register. */
202 if (first_regno == last_regno) /* only want one reg */
203 {
204 /* printf("Asking for register %d\n", first_regno); */
205
206 /* if asking for an invalid register */
207 if ((first_regno == MQ_REGNUM) ||
208 ((first_regno >= FP0_REGNUM) && (first_regno <= FPLAST_REGNUM)))
209 {
210 /* printf("invalid reg request!\n"); */
211 supply_register (first_regno, NULL);
212 return; /* Unsupported register */
213 }
214 else
215 {
216 regs = ocd_read_bdm_registers (first_bdm_regno,
217 last_bdm_regno, &reglen);
218 }
219 }
220 else
221 /* want all regs */
222 {
223 /* printf("Asking for registers %d to %d\n", first_regno, last_regno); */
224 beginregs = ocd_read_bdm_registers (first_bdm_regno,
225 FP0_REGNUM - 1, &beginreglen);
226 endregs = (strcat (midregs,
227 ocd_read_bdm_registers (FPLAST_REGNUM + 1,
228 last_bdm_regno - 1, &endreglen)));
229 almostregs = (strcat (beginregs, endregs));
230 regs = (strcat (almostregs, mqreg));
231 reglen = beginreglen + 32 + endreglen + 1;
232 }
233
234 #endif
235 #if 0
236 regs = ocd_read_bdm_registers (first_bdm_regno, last_bdm_regno, &reglen);
237 #endif
238
239 for (i = first_regno; i <= last_regno; i++)
240 {
241 int bdm_regno, regoffset;
242
243 bdm_regno = bdm_regmap[i];
244 if (bdm_regno != -1)
245 {
246 regoffset = bdm_regno - first_bdm_regno;
247
248 if (regoffset >= reglen / 4)
249 continue;
250
251 supply_register (i, regs + 4 * regoffset);
252 }
253 else
254 supply_register (i, NULL); /* Unsupported register */
255 }
256 }
257
258 /* Store register REGNO, or all registers if REGNO == -1, from the contents
259 of REGISTERS. FIXME: ignores errors. */
260
261 static void
262 bdm_ppc_store_registers (regno)
263 int regno;
264 {
265 int i;
266 int first_regno, last_regno;
267 int first_bdm_regno, last_bdm_regno;
268
269 if (regno == -1)
270 {
271 first_regno = 0;
272 last_regno = NUM_REGS - 1;
273
274 first_bdm_regno = 0;
275 last_bdm_regno = BDM_NUM_REGS - 1;
276 }
277 else
278 {
279 first_regno = regno;
280 last_regno = regno;
281
282 first_bdm_regno = bdm_regmap[regno];
283 last_bdm_regno = bdm_regmap[regno];
284 }
285
286 if (first_bdm_regno == -1)
287 return; /* Unsupported register */
288
289 for (i = first_regno; i <= last_regno; i++)
290 {
291 int bdm_regno;
292
293 bdm_regno = bdm_regmap[i];
294
295 /* only attempt to write if it's a valid ppc 8xx register */
296 /* (need to avoid FP regs and MQ reg) */
297 if ((i != MQ_REGNUM) && ((i < FP0_REGNUM) || (i > FPLAST_REGNUM)))
298 {
299 /* printf("write valid reg %d\n", bdm_regno); */
300 ocd_write_bdm_registers (bdm_regno, registers + REGISTER_BYTE (i), 4);
301 }
302 /*
303 else if (i == MQ_REGNUM)
304 printf("don't write invalid reg %d (MQ_REGNUM)\n", bdm_regno);
305 else
306 printf("don't write invalid reg %d\n", bdm_regno);
307 */
308 }
309 }
310 \f
311 /* Define the target subroutine names */
312
313 struct target_ops bdm_ppc_ops;
314
315 static void
316 init_bdm_ppc_ops (void)
317 {
318 bdm_ppc_ops.to_shortname = "ocd";
319 bdm_ppc_ops.to_longname = "Remote target with On-Chip Debugging";
320 bdm_ppc_ops.to_doc = "Use a remote target with On-Chip Debugging. To use a target box;\n\
321 specify the serial device it is connected to (e.g. /dev/ttya). To use\n\
322 a wiggler, specify wiggler and then the port it is connected to\n\
323 (e.g. wiggler lpt1)."; /* to_doc */
324 bdm_ppc_ops.to_open = bdm_ppc_open;
325 bdm_ppc_ops.to_close = ocd_close;
326 bdm_ppc_ops.to_attach = NULL;
327 bdm_ppc_ops.to_post_attach = NULL;
328 bdm_ppc_ops.to_require_attach = NULL;
329 bdm_ppc_ops.to_detach = ocd_detach;
330 bdm_ppc_ops.to_require_detach = NULL;
331 bdm_ppc_ops.to_resume = ocd_resume;
332 bdm_ppc_ops.to_wait = bdm_ppc_wait;
333 bdm_ppc_ops.to_post_wait = NULL;
334 bdm_ppc_ops.to_fetch_registers = bdm_ppc_fetch_registers;
335 bdm_ppc_ops.to_store_registers = bdm_ppc_store_registers;
336 bdm_ppc_ops.to_prepare_to_store = ocd_prepare_to_store;
337 bdm_ppc_ops.to_xfer_memory = ocd_xfer_memory;
338 bdm_ppc_ops.to_files_info = ocd_files_info;
339 bdm_ppc_ops.to_insert_breakpoint = ocd_insert_breakpoint;
340 bdm_ppc_ops.to_remove_breakpoint = ocd_remove_breakpoint;
341 bdm_ppc_ops.to_terminal_init = NULL;
342 bdm_ppc_ops.to_terminal_inferior = NULL;
343 bdm_ppc_ops.to_terminal_ours_for_output = NULL;
344 bdm_ppc_ops.to_terminal_ours = NULL;
345 bdm_ppc_ops.to_terminal_info = NULL;
346 bdm_ppc_ops.to_kill = ocd_kill;
347 bdm_ppc_ops.to_load = ocd_load;
348 bdm_ppc_ops.to_lookup_symbol = NULL;
349 bdm_ppc_ops.to_create_inferior = ocd_create_inferior;
350 bdm_ppc_ops.to_post_startup_inferior = NULL;
351 bdm_ppc_ops.to_acknowledge_created_inferior = NULL;
352 bdm_ppc_ops.to_clone_and_follow_inferior = NULL;
353 bdm_ppc_ops.to_post_follow_inferior_by_clone = NULL;
354 bdm_ppc_ops.to_insert_fork_catchpoint = NULL;
355 bdm_ppc_ops.to_remove_fork_catchpoint = NULL;
356 bdm_ppc_ops.to_insert_vfork_catchpoint = NULL;
357 bdm_ppc_ops.to_remove_vfork_catchpoint = NULL;
358 bdm_ppc_ops.to_has_forked = NULL;
359 bdm_ppc_ops.to_has_vforked = NULL;
360 bdm_ppc_ops.to_can_follow_vfork_prior_to_exec = NULL;
361 bdm_ppc_ops.to_post_follow_vfork = NULL;
362 bdm_ppc_ops.to_insert_exec_catchpoint = NULL;
363 bdm_ppc_ops.to_remove_exec_catchpoint = NULL;
364 bdm_ppc_ops.to_has_execd = NULL;
365 bdm_ppc_ops.to_reported_exec_events_per_exec_call = NULL;
366 bdm_ppc_ops.to_has_exited = NULL;
367 bdm_ppc_ops.to_mourn_inferior = ocd_mourn;
368 bdm_ppc_ops.to_can_run = 0;
369 bdm_ppc_ops.to_notice_signals = 0;
370 bdm_ppc_ops.to_thread_alive = ocd_thread_alive;
371 bdm_ppc_ops.to_stop = ocd_stop;
372 bdm_ppc_ops.to_pid_to_exec_file = NULL;
373 bdm_ppc_ops.to_core_file_to_sym_file = NULL;
374 bdm_ppc_ops.to_stratum = process_stratum;
375 bdm_ppc_ops.DONT_USE = NULL;
376 bdm_ppc_ops.to_has_all_memory = 1;
377 bdm_ppc_ops.to_has_memory = 1;
378 bdm_ppc_ops.to_has_stack = 1;
379 bdm_ppc_ops.to_has_registers = 1;
380 bdm_ppc_ops.to_has_execution = 1;
381 bdm_ppc_ops.to_sections = NULL;
382 bdm_ppc_ops.to_sections_end = NULL;
383 bdm_ppc_ops.to_magic = OPS_MAGIC;
384 } /* init_bdm_ppc_ops */
385
386 void
387 _initialize_bdm_ppc ()
388 {
389 init_bdm_ppc_ops ();
390 add_target (&bdm_ppc_ops);
391 }