1 /* Remote target communications for the Macraigor Systems BDM Wiggler
2 talking to a Motorola PPC 8xx ADS board
3 Copyright (C) 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., 51 Franklin Street, Fifth Floor,
21 Boston, MA 02110-1301, USA. */
25 #include "gdb_string.h"
34 #include "gdb-stabs.h"
35 #include <sys/types.h>
40 #include "gdb_assert.h"
42 static void bdm_ppc_open (char *name, int from_tty);
44 static ptid_t bdm_ppc_wait (ptid_t ptid,
45 struct target_waitstatus *target_status);
47 static void bdm_ppc_fetch_registers (int regno);
49 static void bdm_ppc_store_registers (int regno);
51 extern struct target_ops bdm_ppc_ops; /* Forward decl */
53 /*#define BDM_NUM_REGS 71 */
54 #define BDM_NUM_REGS 24
57 2048, 2049, 2050, 2051, 2052, 2053, 2054, 2055, /* r0-r7 */ \
58 2056, 2057, 2058, 2059, 2060, 2061, 2062, 2063, /* r8-r15 */ \
59 2064, 2065, 2066, 2067, 2068, 2069, 2070, 2071, /* r16-r23 */ \
60 2072, 2073, 2074, 2075, 2076, 2077, 2078, 2079, /* r24-r31 */ \
62 2080, 2082, 2084, 2086, 2088, 2090, 2092, 2094, /* fp0->fp8 */ \
63 2096, 2098, 2100, 2102, 2104, 2106, 2108, 2110, /* fp0->fp8 */ \
64 2112, 2114, 2116, 2118, 2120, 2122, 2124, 2126, /* fp0->fp8 */ \
65 2128, 2130, 2132, 2134, 2136, 2138, 2140, 2142, /* fp0->fp8 */ \
67 26, /* pc (SRR0 (SPR 26)) */ \
68 2146, /* ps (MSR) */ \
69 2144, /* cnd (CR) */ \
71 9, /* cnt (CTR (SPR 9)) */ \
72 1, /* xer (SPR 1) */ \
77 {0xff, 0xff, 0xff, 0x88};
79 /* Open a connection to a remote debugger.
80 NAME is the filename used for communication. */
83 bdm_ppc_open (char *name, int from_tty)
85 CORE_ADDR watchdogaddr = 0xff000004;
87 ocd_open (name, from_tty, OCD_TARGET_MOTO_PPC, &bdm_ppc_ops);
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);
93 /* Disable watchdog timer on the board */
94 ocd_write_bytes (watchdogaddr, nowatchdog, 4);
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). */
103 bdm_ppc_wait (ptid_t ptid, 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;
114 return inferior_ptid;
117 target_status->value.sig = TARGET_SIGNAL_TRAP; /* XXX for now */
121 unsigned long ecr, der;
123 ecr = ocd_read_bdm_register (148); /* Read the exception cause register */
124 der = ocd_read_bdm_register (149); /* Read the debug enables register */
125 fprintf_unfiltered (gdb_stdout, "ecr = 0x%x, der = 0x%x\n", ecr, der);
129 return inferior_ptid;
132 static int bdm_regmap[] =
135 /* Read the remote registers into regs.
136 Fetch register REGNO, or all registers if REGNO == -1
138 The Wiggler uses the following codes to access the registers:
140 0 -> 1023 SPR 0 -> 1023
144 9 - SPR 9 - CTR (known as cnt in GDB)
145 26 - SPR 26 - SRR0 - pc
146 1024 -> 2047 DCR 0 -> DCR 1023 (IBM PPC 4xx only)
147 2048 -> 2079 R0 -> R31
148 2080 -> 2143 FP0 -> FP31 (64 bit regs) (IBM PPC 5xx only)
149 2144 CR (known as cnd in GDB)
151 2146 MSR (known as ps in GDB)
155 bdm_ppc_fetch_registers (int regno)
157 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
160 int first_regno, last_regno;
161 int first_bdm_regno, last_bdm_regno;
167 last_regno = NUM_REGS - 1;
170 last_bdm_regno = BDM_NUM_REGS - 1;
177 first_bdm_regno = bdm_regmap[regno];
178 last_bdm_regno = bdm_regmap[regno];
181 if (first_bdm_regno == -1)
183 regcache_raw_supply (current_regcache, first_regno, NULL);
184 return; /* Unsupported register */
187 /* FIXME: jimb/2004-05-04: I'm not sure how to adapt this code to
188 processors that lack floating point registers, and I don't have
189 have the equipment to test it. So we'll leave that case for the
190 next person who encounters it. */
191 gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
194 /* Can't ask for floating point regs on ppc 8xx, also need to
195 avoid asking for the mq register. */
196 if (first_regno == last_regno) /* only want one reg */
198 /* printf("Asking for register %d\n", first_regno); */
200 /* if asking for an invalid register */
201 if ((first_regno == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
202 || (first_regno == gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum)
203 || ((first_regno >= tdep->ppc_fp0_regnum)
204 && (first_regno < tdep->ppc_fp0_regnum + ppc_num_fprs)))
206 /* printf("invalid reg request!\n"); */
207 regcache_raw_supply (current_regcache, first_regno, NULL);
208 return; /* Unsupported register */
212 regs = ocd_read_bdm_registers (first_bdm_regno,
213 last_bdm_regno, ®len);
217 internal_error (__FILE__, __LINE__,
218 _("ppc_bdm_fetch_registers: "
219 "'all registers' case not implemented"));
223 regs = ocd_read_bdm_registers (first_bdm_regno, last_bdm_regno, ®len);
226 for (i = first_regno; i <= last_regno; i++)
228 int bdm_regno, regoffset;
230 bdm_regno = bdm_regmap[i];
233 regoffset = bdm_regno - first_bdm_regno;
235 if (regoffset >= reglen / 4)
238 regcache_raw_supply (current_regcache, i, regs + 4 * regoffset);
241 regcache_raw_supply (current_regcache, i, NULL); /* Unsupported register */
245 /* Store register REGNO, or all registers if REGNO == -1, from the contents
246 of REGISTERS. FIXME: ignores errors. */
249 bdm_ppc_store_registers (int regno)
251 struct gdbarch_tdep *tdep = gdbarch_tdep (current_gdbarch);
253 int first_regno, last_regno;
254 int first_bdm_regno, last_bdm_regno;
259 last_regno = NUM_REGS - 1;
262 last_bdm_regno = BDM_NUM_REGS - 1;
269 first_bdm_regno = bdm_regmap[regno];
270 last_bdm_regno = bdm_regmap[regno];
273 if (first_bdm_regno == -1)
274 return; /* Unsupported register */
276 /* FIXME: jimb/2004-05-04: I'm not sure how to adapt this code to
277 processors that lack floating point registers, and I don't have
278 have the equipment to test it. So we'll leave that case for the
279 next person who encounters it. */
280 gdb_assert (ppc_floating_point_unit_p (current_gdbarch));
282 for (i = first_regno; i <= last_regno; i++)
286 bdm_regno = bdm_regmap[i];
288 /* only attempt to write if it's a valid ppc 8xx register */
289 /* (need to avoid FP regs and MQ reg) */
290 if ((i != gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
291 && (i != gdbarch_tdep (current_gdbarch)->ppc_fpscr_regnum)
292 && ((i < tdep->ppc_fp0_regnum)
293 || (i >= tdep->ppc_fp0_regnum + ppc_num_fprs)))
295 /* printf("write valid reg %d\n", bdm_regno); */
296 ocd_write_bdm_registers (bdm_regno, deprecated_registers + DEPRECATED_REGISTER_BYTE (i), 4);
299 else if (i == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
300 printf("don't write invalid reg %d (PPC_MQ_REGNUM)\n", bdm_regno);
302 printf("don't write invalid reg %d\n", bdm_regno);
307 /* Define the target subroutine names */
309 struct target_ops bdm_ppc_ops;
312 init_bdm_ppc_ops (void)
314 bdm_ppc_ops.to_shortname = "ocd";
315 bdm_ppc_ops.to_longname = "Remote target with On-Chip Debugging";
316 bdm_ppc_ops.to_doc = "Use a remote target with On-Chip Debugging. To use a target box;\n\
317 specify the serial device it is connected to (e.g. /dev/ttya). To use\n\
318 a wiggler, specify wiggler and then the port it is connected to\n\
319 (e.g. wiggler lpt1)."; /* to_doc */
320 bdm_ppc_ops.to_open = bdm_ppc_open;
321 bdm_ppc_ops.to_close = ocd_close;
322 bdm_ppc_ops.to_detach = ocd_detach;
323 bdm_ppc_ops.to_resume = ocd_resume;
324 bdm_ppc_ops.to_wait = bdm_ppc_wait;
325 bdm_ppc_ops.to_fetch_registers = bdm_ppc_fetch_registers;
326 bdm_ppc_ops.to_store_registers = bdm_ppc_store_registers;
327 bdm_ppc_ops.to_prepare_to_store = ocd_prepare_to_store;
328 bdm_ppc_ops.deprecated_xfer_memory = ocd_xfer_memory;
329 bdm_ppc_ops.to_files_info = ocd_files_info;
330 bdm_ppc_ops.to_insert_breakpoint = ocd_insert_breakpoint;
331 bdm_ppc_ops.to_remove_breakpoint = ocd_remove_breakpoint;
332 bdm_ppc_ops.to_kill = ocd_kill;
333 bdm_ppc_ops.to_load = ocd_load;
334 bdm_ppc_ops.to_create_inferior = ocd_create_inferior;
335 bdm_ppc_ops.to_mourn_inferior = ocd_mourn;
336 bdm_ppc_ops.to_thread_alive = ocd_thread_alive;
337 bdm_ppc_ops.to_stop = ocd_stop;
338 bdm_ppc_ops.to_stratum = process_stratum;
339 bdm_ppc_ops.to_has_all_memory = 1;
340 bdm_ppc_ops.to_has_memory = 1;
341 bdm_ppc_ops.to_has_stack = 1;
342 bdm_ppc_ops.to_has_registers = 1;
343 bdm_ppc_ops.to_has_execution = 1;
344 bdm_ppc_ops.to_magic = OPS_MAGIC;
345 } /* init_bdm_ppc_ops */
347 extern initialize_file_ftype _initialize_bdm_ppc; /* -Wmissing-prototypes */
350 _initialize_bdm_ppc (void)
353 add_target (&bdm_ppc_ops);