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>
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
);
159 unsigned char *regs
, *beginregs
, *endregs
, *almostregs
;
160 unsigned char midregs
[32];
161 unsigned char mqreg
[1];
162 int first_regno
, last_regno
;
163 int first_bdm_regno
, last_bdm_regno
;
164 int reglen
, beginreglen
, endreglen
;
167 for (i
= 0; i
< ppc_num_fprs
; i
++)
177 last_regno
= NUM_REGS
- 1;
180 last_bdm_regno
= BDM_NUM_REGS
- 1;
187 first_bdm_regno
= bdm_regmap
[regno
];
188 last_bdm_regno
= bdm_regmap
[regno
];
191 if (first_bdm_regno
== -1)
193 supply_register (first_regno
, NULL
);
194 return; /* Unsupported register */
197 /* FIXME: jimb/2004-05-04: I'm not sure how to adapt this code to
198 processors that lack floating point registers, and I don't have
199 have the equipment to test it. So we'll leave that case for the
200 next person who encounters it. */
201 gdb_assert (ppc_floating_point_unit_p (current_gdbarch
));
204 /* Can't ask for floating point regs on ppc 8xx, also need to
205 avoid asking for the mq register. */
206 if (first_regno
== last_regno
) /* only want one reg */
208 /* printf("Asking for register %d\n", first_regno); */
210 /* if asking for an invalid register */
211 if ((first_regno
== gdbarch_tdep (current_gdbarch
)->ppc_mq_regnum
)
212 || (first_regno
== gdbarch_tdep (current_gdbarch
)->ppc_fpscr_regnum
)
213 || ((first_regno
>= tdep
->ppc_fp0_regnum
)
214 && (first_regno
< tdep
->ppc_fp0_regnum
+ ppc_num_fprs
)))
216 /* printf("invalid reg request!\n"); */
217 supply_register (first_regno
, NULL
);
218 return; /* Unsupported register */
222 regs
= ocd_read_bdm_registers (first_bdm_regno
,
223 last_bdm_regno
, ®len
);
229 /* printf("Asking for registers %d to %d\n", first_regno, last_regno); */
230 beginregs
= ocd_read_bdm_registers (first_bdm_regno
,
231 tdep
->ppc_fp0_regnum
- 1,
235 ocd_read_bdm_registers (tdep
->ppc_fp0_regnum
+ ppc_num_fprs
,
236 last_bdm_regno
- 1, &endreglen
)));
237 almostregs
= (strcat (beginregs
, endregs
));
238 regs
= (strcat (almostregs
, mqreg
));
239 reglen
= beginreglen
+ 32 + endreglen
+ 1;
244 regs
= ocd_read_bdm_registers (first_bdm_regno
, last_bdm_regno
, ®len
);
247 for (i
= first_regno
; i
<= last_regno
; i
++)
249 int bdm_regno
, regoffset
;
251 bdm_regno
= bdm_regmap
[i
];
254 regoffset
= bdm_regno
- first_bdm_regno
;
256 if (regoffset
>= reglen
/ 4)
259 supply_register (i
, regs
+ 4 * regoffset
);
262 supply_register (i
, NULL
); /* Unsupported register */
266 /* Store register REGNO, or all registers if REGNO == -1, from the contents
267 of REGISTERS. FIXME: ignores errors. */
270 bdm_ppc_store_registers (int regno
)
272 struct gdbarch_tdep
*tdep
= gdbarch_tdep (current_gdbarch
);
274 int first_regno
, last_regno
;
275 int first_bdm_regno
, last_bdm_regno
;
280 last_regno
= NUM_REGS
- 1;
283 last_bdm_regno
= BDM_NUM_REGS
- 1;
290 first_bdm_regno
= bdm_regmap
[regno
];
291 last_bdm_regno
= bdm_regmap
[regno
];
294 if (first_bdm_regno
== -1)
295 return; /* Unsupported register */
297 /* FIXME: jimb/2004-05-04: I'm not sure how to adapt this code to
298 processors that lack floating point registers, and I don't have
299 have the equipment to test it. So we'll leave that case for the
300 next person who encounters it. */
301 gdb_assert (ppc_floating_point_unit_p (current_gdbarch
));
303 for (i
= first_regno
; i
<= last_regno
; i
++)
307 bdm_regno
= bdm_regmap
[i
];
309 /* only attempt to write if it's a valid ppc 8xx register */
310 /* (need to avoid FP regs and MQ reg) */
311 if ((i
!= gdbarch_tdep (current_gdbarch
)->ppc_mq_regnum
)
312 && (i
!= gdbarch_tdep (current_gdbarch
)->ppc_fpscr_regnum
)
313 && ((i
< tdep
->ppc_fp0_regnum
)
314 || (i
>= tdep
->ppc_fp0_regnum
+ ppc_num_fprs
)))
316 /* printf("write valid reg %d\n", bdm_regno); */
317 ocd_write_bdm_registers (bdm_regno
, deprecated_registers
+ DEPRECATED_REGISTER_BYTE (i
), 4);
320 else if (i == gdbarch_tdep (current_gdbarch)->ppc_mq_regnum)
321 printf("don't write invalid reg %d (PPC_MQ_REGNUM)\n", bdm_regno);
323 printf("don't write invalid reg %d\n", bdm_regno);
328 /* Define the target subroutine names */
330 struct target_ops bdm_ppc_ops
;
333 init_bdm_ppc_ops (void)
335 bdm_ppc_ops
.to_shortname
= "ocd";
336 bdm_ppc_ops
.to_longname
= "Remote target with On-Chip Debugging";
337 bdm_ppc_ops
.to_doc
= "Use a remote target with On-Chip Debugging. To use a target box;\n\
338 specify the serial device it is connected to (e.g. /dev/ttya). To use\n\
339 a wiggler, specify wiggler and then the port it is connected to\n\
340 (e.g. wiggler lpt1)."; /* to_doc */
341 bdm_ppc_ops
.to_open
= bdm_ppc_open
;
342 bdm_ppc_ops
.to_close
= ocd_close
;
343 bdm_ppc_ops
.to_detach
= ocd_detach
;
344 bdm_ppc_ops
.to_resume
= ocd_resume
;
345 bdm_ppc_ops
.to_wait
= bdm_ppc_wait
;
346 bdm_ppc_ops
.to_fetch_registers
= bdm_ppc_fetch_registers
;
347 bdm_ppc_ops
.to_store_registers
= bdm_ppc_store_registers
;
348 bdm_ppc_ops
.to_prepare_to_store
= ocd_prepare_to_store
;
349 bdm_ppc_ops
.to_xfer_memory
= ocd_xfer_memory
;
350 bdm_ppc_ops
.to_files_info
= ocd_files_info
;
351 bdm_ppc_ops
.to_insert_breakpoint
= ocd_insert_breakpoint
;
352 bdm_ppc_ops
.to_remove_breakpoint
= ocd_remove_breakpoint
;
353 bdm_ppc_ops
.to_kill
= ocd_kill
;
354 bdm_ppc_ops
.to_load
= ocd_load
;
355 bdm_ppc_ops
.to_create_inferior
= ocd_create_inferior
;
356 bdm_ppc_ops
.to_mourn_inferior
= ocd_mourn
;
357 bdm_ppc_ops
.to_thread_alive
= ocd_thread_alive
;
358 bdm_ppc_ops
.to_stop
= ocd_stop
;
359 bdm_ppc_ops
.to_stratum
= process_stratum
;
360 bdm_ppc_ops
.to_has_all_memory
= 1;
361 bdm_ppc_ops
.to_has_memory
= 1;
362 bdm_ppc_ops
.to_has_stack
= 1;
363 bdm_ppc_ops
.to_has_registers
= 1;
364 bdm_ppc_ops
.to_has_execution
= 1;
365 bdm_ppc_ops
.to_magic
= OPS_MAGIC
;
366 } /* init_bdm_ppc_ops */
368 extern initialize_file_ftype _initialize_bdm_ppc
; /* -Wmissing-prototypes */
371 _initialize_bdm_ppc (void)
374 add_target (&bdm_ppc_ops
);