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.
5 This file is part of GDB.
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.
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.
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, Boston, MA 02111-1307, USA. */
23 #include "gdb_string.h"
33 #include "gdb-stabs.h"
34 #include <sys/types.h>
39 static void bdm_ppc_open PARAMS ((char *name, int from_tty));
41 static int bdm_ppc_wait PARAMS ((int pid,
42 struct target_waitstatus *target_status));
44 static void bdm_ppc_fetch_registers PARAMS ((int regno));
46 static void bdm_ppc_store_registers PARAMS ((int regno));
48 extern struct target_ops bdm_ppc_ops; /* Forward decl */
50 /*#define BDM_NUM_REGS 71*/
51 #define BDM_NUM_REGS 24
54 2048, 2049, 2050, 2051, 2052, 2053, 2054, 2055, /* r0-r7 */ \
55 2056, 2057, 2058, 2059, 2060, 2061, 2062, 2063, /* r8-r15 */ \
56 2064, 2065, 2066, 2067, 2068, 2069, 2070, 2071, /* r16-r23 */ \
57 2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, /* r24-r31 */ \
59 2080, 2082, 2084, 2086, 2088, 2090, 2092, 2094, /* fp0->fp8 */ \
60 2096, 2098, 2100, 2102, 2104, 2106, 2108, 2110, /* fp0->fp8 */ \
61 2112, 2114, 2116, 2118, 2120, 2122, 2124, 2126, /* fp0->fp8 */ \
62 2128, 2130, 2132, 2134, 2136, 2138, 2140, 2142, /* fp0->fp8 */ \
64 26, /* pc (SRR0 (SPR 26)) */ \
65 2146, /* ps (MSR) */ \
66 2144, /* cnd (CR) */ \
68 9, /* cnt (CTR (SPR 9)) */ \
69 1, /* xer (SPR 1) */ \
73 char nowatchdog[4] = {0xff,0xff,0xff,0x88};
75 /* Open a connection to a remote debugger.
76 NAME is the filename used for communication. */
79 bdm_ppc_open (name, from_tty)
83 CORE_ADDR watchdogaddr = 0xff000004;
85 ocd_open (name, from_tty, OCD_TARGET_MOTO_PPC, &bdm_ppc_ops);
87 /* We want interrupts to drop us into debugging mode. */
88 /* Modify the DER register to accomplish this. */
89 ocd_write_bdm_register (149, 0x20024000);
91 /* Disable watchdog timer on the board */
92 ocd_write_bytes (watchdogaddr, nowatchdog, 4);
95 /* Wait until the remote machine stops, then return,
96 storing status in STATUS just as `wait' would.
97 Returns "pid" (though it's not clear what, if anything, that
98 means in the case of this target). */
101 bdm_ppc_wait (pid, target_status)
103 struct target_waitstatus *target_status;
107 target_status->kind = TARGET_WAITKIND_STOPPED;
109 stop_reason = ocd_wait ();
113 target_status->value.sig = TARGET_SIGNAL_INT;
117 target_status->value.sig = TARGET_SIGNAL_TRAP; /* XXX for now */
120 unsigned long ecr, der;
122 ecr = ocd_read_bdm_register (148); /* Read the exception cause register */
123 der = ocd_read_bdm_register (149); /* Read the debug enables register */
124 fprintf_unfiltered (gdb_stdout, "ecr = 0x%x, der = 0x%x\n", ecr, der);
130 static int bdm_regmap[] = {BDM_REGMAP};
132 /* Read the remote registers into regs.
133 Fetch register REGNO, or all registers if REGNO == -1
135 The Wiggler uses the following codes to access the registers:
137 0 -> 1023 SPR 0 -> 1023
141 9 - SPR 9 - CTR (known as cnt in GDB)
142 26 - SPR 26 - SRR0 - pc
143 1024 -> 2047 DCR 0 -> DCR 1023 (IBM PPC 4xx only)
144 2048 -> 2079 R0 -> R31
145 2080 -> 2143 FP0 -> FP31 (64 bit regs) (IBM PPC 5xx only)
146 2144 CR (known as cnd in GDB)
148 2146 MSR (known as ps in GDB)
152 bdm_ppc_fetch_registers (regno)
156 unsigned char *regs, *beginregs, *endregs, *almostregs;
157 unsigned char midregs[32];
158 unsigned char mqreg[1];
159 int first_regno, last_regno;
160 int first_bdm_regno, last_bdm_regno;
161 int reglen, beginreglen, endreglen;
164 for (i = 0; i < (FPLAST_REGNUM - FP0_REGNUM + 1); i++)
174 last_regno = NUM_REGS - 1;
177 last_bdm_regno = BDM_NUM_REGS - 1;
184 first_bdm_regno = bdm_regmap [regno];
185 last_bdm_regno = bdm_regmap [regno];
188 if (first_bdm_regno == -1)
190 supply_register (first_regno, NULL);
191 return; /* Unsupported register */
195 /* Can't ask for floating point regs on ppc 8xx, also need to
196 avoid asking for the mq register. */
197 if (first_regno == last_regno) /* only want one reg */
199 /* printf("Asking for register %d\n", first_regno); */
201 /* if asking for an invalid register */
202 if ((first_regno == MQ_REGNUM) ||
203 ((first_regno >= FP0_REGNUM) && (first_regno <= FPLAST_REGNUM)))
205 /* printf("invalid reg request!\n"); */
206 supply_register (first_regno, NULL);
207 return; /* Unsupported register */
211 regs = ocd_read_bdm_registers (first_bdm_regno,
212 last_bdm_regno, ®len);
215 else /* want all regs */
217 /* printf("Asking for registers %d to %d\n", first_regno, last_regno); */
218 beginregs = ocd_read_bdm_registers (first_bdm_regno,
219 FP0_REGNUM - 1, &beginreglen);
220 endregs = (strcat (midregs,
221 ocd_read_bdm_registers (FPLAST_REGNUM + 1,
222 last_bdm_regno - 1, &endreglen)));
223 almostregs = (strcat (beginregs, endregs));
224 regs = (strcat (almostregs, mqreg));
225 reglen = beginreglen + 32 + endreglen + 1;
230 regs = ocd_read_bdm_registers (first_bdm_regno, last_bdm_regno, ®len);
233 for (i = first_regno; i <= last_regno; i++)
235 int bdm_regno, regoffset;
237 bdm_regno = bdm_regmap [i];
240 regoffset = bdm_regno - first_bdm_regno;
242 if (regoffset >= reglen / 4)
245 supply_register (i, regs + 4 * regoffset);
248 supply_register (i, NULL); /* Unsupported register */
252 /* Store register REGNO, or all registers if REGNO == -1, from the contents
253 of REGISTERS. FIXME: ignores errors. */
256 bdm_ppc_store_registers (regno)
260 int first_regno, last_regno;
261 int first_bdm_regno, last_bdm_regno;
266 last_regno = NUM_REGS - 1;
269 last_bdm_regno = BDM_NUM_REGS - 1;
276 first_bdm_regno = bdm_regmap [regno];
277 last_bdm_regno = bdm_regmap [regno];
280 if (first_bdm_regno == -1)
281 return; /* Unsupported register */
283 for (i = first_regno; i <= last_regno; i++)
287 bdm_regno = bdm_regmap [i];
289 /* only attempt to write if it's a valid ppc 8xx register */
290 /* (need to avoid FP regs and MQ reg) */
291 if ((i != MQ_REGNUM) && ((i < FP0_REGNUM) || (i > FPLAST_REGNUM)))
293 /* printf("write valid reg %d\n", bdm_regno); */
294 ocd_write_bdm_registers (bdm_regno, registers + REGISTER_BYTE (i), 4);
297 else if (i == MQ_REGNUM)
298 printf("don't write invalid reg %d (MQ_REGNUM)\n", bdm_regno);
300 printf("don't write invalid reg %d\n", bdm_regno);
305 /* Define the target subroutine names */
307 struct target_ops bdm_ppc_ops = {
308 "ocd", /* to_shortname */
309 "Remote target with On-Chip Debugging", /* to_longname */
310 "Use a remote target with On-Chip Debugging. To use a target box,\n\
311 specify the serial device it is connected to (e.g. /dev/ttya). To use\n\
312 a wiggler, specify wiggler and then the port it is connected to\n\
313 (e.g. wiggler lpt1).", /* to_doc */
314 bdm_ppc_open, /* to_open */
315 ocd_close, /* to_close */
316 NULL, /* to_attach */
317 ocd_detach, /* to_detach */
318 ocd_resume, /* to_resume */
319 bdm_ppc_wait, /* to_wait */
320 bdm_ppc_fetch_registers, /* to_fetch_registers */
321 bdm_ppc_store_registers, /* to_store_registers */
322 ocd_prepare_to_store, /* to_prepare_to_store */
323 ocd_xfer_memory, /* to_xfer_memory */
324 ocd_files_info, /* to_files_info */
325 ocd_insert_breakpoint, /* to_insert_breakpoint */
326 ocd_remove_breakpoint, /* to_remove_breakpoint */
327 NULL, /* to_terminal_init */
328 NULL, /* to_terminal_inferior */
329 NULL, /* to_terminal_ours_for_output */
330 NULL, /* to_terminal_ours */
331 NULL, /* to_terminal_info */
332 ocd_kill, /* to_kill */
333 ocd_load, /* to_load */
334 NULL, /* to_lookup_symbol */
335 ocd_create_inferior, /* to_create_inferior */
336 ocd_mourn, /* to_mourn_inferior */
338 0, /* to_notice_signals */
339 ocd_thread_alive, /* to_thread_alive */
340 ocd_stop, /* to_stop */
341 process_stratum, /* to_stratum */
343 1, /* to_has_all_memory */
344 1, /* to_has_memory */
345 1, /* to_has_stack */
346 1, /* to_has_registers */
347 1, /* to_has_execution */
349 NULL, /* sections_end */
350 OPS_MAGIC /* to_magic */
354 _initialize_bdm_ppc ()
356 add_target (&bdm_ppc_ops);