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
+ 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 */
350 _initialize_bdm_ppc (void)
353 add_target (&bdm_ppc_ops
);
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