1 /* Remote target communications for the Macraigor Systems BDM Wiggler
2 talking to a Motorola PPC 8xx ADS board
3 Copyright 1996, 1997, 1998, 1999, 2000, 2001
4 Free Software Foundation, Inc.
6 This file is part of GDB.
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 59 Temple Place - Suite 330,
21 Boston, MA 02111-1307, USA. */
25 #include "gdb_string.h"
34 #include "gdb-stabs.h"
35 #include <sys/types.h>
41 static void bdm_ppc_open (char *name, int from_tty);
43 static ptid_t bdm_ppc_wait (ptid_t ptid,
44 struct target_waitstatus *target_status);
46 static void bdm_ppc_fetch_registers (int regno);
48 static void bdm_ppc_store_registers (int regno);
50 extern struct target_ops bdm_ppc_ops; /* Forward decl */
52 /*#define BDM_NUM_REGS 71 */
53 #define BDM_NUM_REGS 24
56 2048, 2049, 2050, 2051, 2052, 2053, 2054, 2055, /* r0-r7 */ \
57 2056, 2057, 2058, 2059, 2060, 2061, 2062, 2063, /* r8-r15 */ \
58 2064, 2065, 2066, 2067, 2068, 2069, 2070, 2071, /* r16-r23 */ \
59 2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, /* r24-r31 */ \
61 2080, 2082, 2084, 2086, 2088, 2090, 2092, 2094, /* fp0->fp8 */ \
62 2096, 2098, 2100, 2102, 2104, 2106, 2108, 2110, /* fp0->fp8 */ \
63 2112, 2114, 2116, 2118, 2120, 2122, 2124, 2126, /* fp0->fp8 */ \
64 2128, 2130, 2132, 2134, 2136, 2138, 2140, 2142, /* fp0->fp8 */ \
66 26, /* pc (SRR0 (SPR 26)) */ \
67 2146, /* ps (MSR) */ \
68 2144, /* cnd (CR) */ \
70 9, /* cnt (CTR (SPR 9)) */ \
71 1, /* xer (SPR 1) */ \
76 {0xff, 0xff, 0xff, 0x88};
78 /* Open a connection to a remote debugger.
79 NAME is the filename used for communication. */
82 bdm_ppc_open (char *name, int from_tty)
84 CORE_ADDR watchdogaddr = 0xff000004;
86 ocd_open (name, from_tty, OCD_TARGET_MOTO_PPC, &bdm_ppc_ops);
88 /* We want interrupts to drop us into debugging mode. */
89 /* Modify the DER register to accomplish this. */
90 ocd_write_bdm_register (149, 0x20024000);
92 /* Disable watchdog timer on the board */
93 ocd_write_bytes (watchdogaddr, nowatchdog, 4);
96 /* Wait until the remote machine stops, then return,
97 storing status in STATUS just as `wait' would.
98 Returns "pid" (though it's not clear what, if anything, that
99 means in the case of this target). */
102 bdm_ppc_wait (ptid_t ptid, struct target_waitstatus *target_status)
106 target_status->kind = TARGET_WAITKIND_STOPPED;
108 stop_reason = ocd_wait ();
112 target_status->value.sig = TARGET_SIGNAL_INT;
113 return inferior_ptid;
116 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);
128 return inferior_ptid;
131 static int bdm_regmap[] =
134 /* Read the remote registers into regs.
135 Fetch register REGNO, or all registers if REGNO == -1
137 The Wiggler uses the following codes to access the registers:
139 0 -> 1023 SPR 0 -> 1023
143 9 - SPR 9 - CTR (known as cnt in GDB)
144 26 - SPR 26 - SRR0 - pc
145 1024 -> 2047 DCR 0 -> DCR 1023 (IBM PPC 4xx only)
146 2048 -> 2079 R0 -> R31
147 2080 -> 2143 FP0 -> FP31 (64 bit regs) (IBM PPC 5xx only)
148 2144 CR (known as cnd in GDB)
150 2146 MSR (known as ps in GDB)
154 bdm_ppc_fetch_registers (int regno)
157 unsigned char *regs, *beginregs, *endregs, *almostregs;
158 unsigned char midregs[32];
159 unsigned char mqreg[1];
160 int first_regno, last_regno;
161 int first_bdm_regno, last_bdm_regno;
162 int reglen, beginreglen, endreglen;
165 for (i = 0; i < (FPLAST_REGNUM - FP0_REGNUM + 1); i++)
175 last_regno = NUM_REGS - 1;
178 last_bdm_regno = BDM_NUM_REGS - 1;
185 first_bdm_regno = bdm_regmap[regno];
186 last_bdm_regno = bdm_regmap[regno];
189 if (first_bdm_regno == -1)
191 supply_register (first_regno, NULL);
192 return; /* Unsupported register */
196 /* Can't ask for floating point regs on ppc 8xx, also need to
197 avoid asking for the mq register. */
198 if (first_regno == last_regno) /* only want one reg */
200 /* printf("Asking for register %d\n", first_regno); */
202 /* if asking for an invalid register */
203 if ((first_regno == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
204 || (first_regno == gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum)
205 || ((first_regno >= FP0_REGNUM) && (first_regno <= FPLAST_REGNUM)))
207 /* printf("invalid reg request!\n"); */
208 supply_register (first_regno, NULL);
209 return; /* Unsupported register */
213 regs = ocd_read_bdm_registers (first_bdm_regno,
214 last_bdm_regno, ®len);
220 /* printf("Asking for registers %d to %d\n", first_regno, last_regno); */
221 beginregs = ocd_read_bdm_registers (first_bdm_regno,
222 FP0_REGNUM - 1, &beginreglen);
223 endregs = (strcat (midregs,
224 ocd_read_bdm_registers (FPLAST_REGNUM + 1,
225 last_bdm_regno - 1, &endreglen)));
226 almostregs = (strcat (beginregs, endregs));
227 regs = (strcat (almostregs, mqreg));
228 reglen = beginreglen + 32 + endreglen + 1;
233 regs = ocd_read_bdm_registers (first_bdm_regno, last_bdm_regno, ®len);
236 for (i = first_regno; i <= last_regno; i++)
238 int bdm_regno, regoffset;
240 bdm_regno = bdm_regmap[i];
243 regoffset = bdm_regno - first_bdm_regno;
245 if (regoffset >= reglen / 4)
248 supply_register (i, regs + 4 * regoffset);
251 supply_register (i, NULL); /* Unsupported register */
255 /* Store register REGNO, or all registers if REGNO == -1, from the contents
256 of REGISTERS. FIXME: ignores errors. */
259 bdm_ppc_store_registers (int regno)
262 int first_regno, last_regno;
263 int first_bdm_regno, last_bdm_regno;
268 last_regno = NUM_REGS - 1;
271 last_bdm_regno = BDM_NUM_REGS - 1;
278 first_bdm_regno = bdm_regmap[regno];
279 last_bdm_regno = bdm_regmap[regno];
282 if (first_bdm_regno == -1)
283 return; /* Unsupported register */
285 for (i = first_regno; i <= last_regno; i++)
289 bdm_regno = bdm_regmap[i];
291 /* only attempt to write if it's a valid ppc 8xx register */
292 /* (need to avoid FP regs and MQ reg) */
293 if ((i != gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
294 && (i != gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum)
295 && ((i < FP0_REGNUM) || (i > FPLAST_REGNUM)))
297 /* printf("write valid reg %d\n", bdm_regno); */
298 ocd_write_bdm_registers (bdm_regno, deprecated_registers + DEPRECATED_REGISTER_BYTE (i), 4);
301 else if (i == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
302 printf("don't write invalid reg %d (PPC_MQ_REGNUM)\n", bdm_regno);
304 printf("don't write invalid reg %d\n", bdm_regno);
309 /* Define the target subroutine names */
311 struct target_ops bdm_ppc_ops;
314 init_bdm_ppc_ops (void)
316 bdm_ppc_ops.to_shortname = "ocd";
317 bdm_ppc_ops.to_longname = "Remote target with On-Chip Debugging";
318 bdm_ppc_ops.to_doc = "Use a remote target with On-Chip Debugging. To use a target box;\n\
319 specify the serial device it is connected to (e.g. /dev/ttya). To use\n\
320 a wiggler, specify wiggler and then the port it is connected to\n\
321 (e.g. wiggler lpt1)."; /* to_doc */
322 bdm_ppc_ops.to_open = bdm_ppc_open;
323 bdm_ppc_ops.to_close = ocd_close;
324 bdm_ppc_ops.to_detach = ocd_detach;
325 bdm_ppc_ops.to_resume = ocd_resume;
326 bdm_ppc_ops.to_wait = bdm_ppc_wait;
327 bdm_ppc_ops.to_fetch_registers = bdm_ppc_fetch_registers;
328 bdm_ppc_ops.to_store_registers = bdm_ppc_store_registers;
329 bdm_ppc_ops.to_prepare_to_store = ocd_prepare_to_store;
330 bdm_ppc_ops.to_xfer_memory = ocd_xfer_memory;
331 bdm_ppc_ops.to_files_info = ocd_files_info;
332 bdm_ppc_ops.to_insert_breakpoint = ocd_insert_breakpoint;
333 bdm_ppc_ops.to_remove_breakpoint = ocd_remove_breakpoint;
334 bdm_ppc_ops.to_kill = ocd_kill;
335 bdm_ppc_ops.to_load = ocd_load;
336 bdm_ppc_ops.to_create_inferior = ocd_create_inferior;
337 bdm_ppc_ops.to_mourn_inferior = ocd_mourn;
338 bdm_ppc_ops.to_thread_alive = ocd_thread_alive;
339 bdm_ppc_ops.to_stop = ocd_stop;
340 bdm_ppc_ops.to_stratum = process_stratum;
341 bdm_ppc_ops.to_has_all_memory = 1;
342 bdm_ppc_ops.to_has_memory = 1;
343 bdm_ppc_ops.to_has_stack = 1;
344 bdm_ppc_ops.to_has_registers = 1;
345 bdm_ppc_ops.to_has_execution = 1;
346 bdm_ppc_ops.to_magic = OPS_MAGIC;
347 } /* init_bdm_ppc_ops */
349 extern initialize_file_ftype _initialize_bdm_ppc; /* -Wmissing-prototypes */
352 _initialize_bdm_ppc (void)
355 add_target (&bdm_ppc_ops);