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retire ERROR_INVALID_ARGUMENTS and replace with ERROR_COMMAND_SYNTAX_ERROR
[openocd/andreasf.git] / src / target / xscale.c
blob46ed8a947ad16adc16b5a2585b39c6c40be6bc57
1 /***************************************************************************
2 * Copyright (C) 2006, 2007 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * Copyright (C) 2007,2008 Øyvind Harboe *
6 * oyvind.harboe@zylin.com *
7 * *
8 * Copyright (C) 2009 Michael Schwingen *
9 * michael@schwingen.org *
10 * *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU General Public License as published by *
13 * the Free Software Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
15 * *
16 * This program is distributed in the hope that it will be useful, *
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
19 * GNU General Public License for more details. *
20 * *
21 * You should have received a copy of the GNU General Public License *
22 * along with this program; if not, write to the *
23 * Free Software Foundation, Inc., *
24 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
25 ***************************************************************************/
26 #ifdef HAVE_CONFIG_H
27 #include "config.h"
28 #endif
29
30 #include "breakpoints.h"
31 #include "xscale.h"
32 #include "target_type.h"
33 #include "arm_jtag.h"
34 #include "arm_simulator.h"
35 #include "arm_disassembler.h"
36 #include <helper/time_support.h>
37 #include "register.h"
38 #include "image.h"
39 #include "arm_opcodes.h"
40 #include "armv4_5.h"
41
42
43 /*
44 * Important XScale documents available as of October 2009 include:
45 *
46 * Intel XScale® Core Developer’s Manual, January 2004
47 * Order Number: 273473-002
48 * This has a chapter detailing debug facilities, and punts some
49 * details to chip-specific microarchitecture documents.
50 *
51 * Hot-Debug for Intel XScale® Core Debug White Paper, May 2005
52 * Document Number: 273539-005
53 * Less detailed than the developer's manual, but summarizes those
54 * missing details (for most XScales) and gives LOTS of notes about
55 * debugger/handler interaction issues. Presents a simpler reset
56 * and load-handler sequence than the arch doc. (Note, OpenOCD
57 * doesn't currently support "Hot-Debug" as defined there.)
58 *
59 * Chip-specific microarchitecture documents may also be useful.
60 */
61
62
63 /* forward declarations */
64 static int xscale_resume(struct target *, int current,
65 uint32_t address, int handle_breakpoints, int debug_execution);
66 static int xscale_debug_entry(struct target *);
67 static int xscale_restore_banked(struct target *);
68 static int xscale_get_reg(struct reg *reg);
69 static int xscale_set_reg(struct reg *reg, uint8_t *buf);
70 static int xscale_set_breakpoint(struct target *, struct breakpoint *);
71 static int xscale_set_watchpoint(struct target *, struct watchpoint *);
72 static int xscale_unset_breakpoint(struct target *, struct breakpoint *);
73 static int xscale_read_trace(struct target *);
74
75
76 /* This XScale "debug handler" is loaded into the processor's
77 * mini-ICache, which is 2K of code writable only via JTAG.
78 *
79 * FIXME the OpenOCD "bin2char" utility currently doesn't handle
80 * binary files cleanly. It's string oriented, and terminates them
81 * with a NUL character. Better would be to generate the constants
82 * and let other code decide names, scoping, and other housekeeping.
83 */
84 static /* unsigned const char xscale_debug_handler[] = ... */
85 #include "xscale_debug.h"
86
87 static char *const xscale_reg_list[] =
88 {
89 "XSCALE_MAINID", /* 0 */
90 "XSCALE_CACHETYPE",
91 "XSCALE_CTRL",
92 "XSCALE_AUXCTRL",
93 "XSCALE_TTB",
94 "XSCALE_DAC",
95 "XSCALE_FSR",
96 "XSCALE_FAR",
97 "XSCALE_PID",
98 "XSCALE_CPACCESS",
99 "XSCALE_IBCR0", /* 10 */
100 "XSCALE_IBCR1",
101 "XSCALE_DBR0",
102 "XSCALE_DBR1",
103 "XSCALE_DBCON",
104 "XSCALE_TBREG",
105 "XSCALE_CHKPT0",
106 "XSCALE_CHKPT1",
107 "XSCALE_DCSR",
108 "XSCALE_TX",
109 "XSCALE_RX", /* 20 */
110 "XSCALE_TXRXCTRL",
111 };
112
113 static const struct xscale_reg xscale_reg_arch_info[] =
114 {
115 {XSCALE_MAINID, NULL},
116 {XSCALE_CACHETYPE, NULL},
117 {XSCALE_CTRL, NULL},
118 {XSCALE_AUXCTRL, NULL},
119 {XSCALE_TTB, NULL},
120 {XSCALE_DAC, NULL},
121 {XSCALE_FSR, NULL},
122 {XSCALE_FAR, NULL},
123 {XSCALE_PID, NULL},
124 {XSCALE_CPACCESS, NULL},
125 {XSCALE_IBCR0, NULL},
126 {XSCALE_IBCR1, NULL},
127 {XSCALE_DBR0, NULL},
128 {XSCALE_DBR1, NULL},
129 {XSCALE_DBCON, NULL},
130 {XSCALE_TBREG, NULL},
131 {XSCALE_CHKPT0, NULL},
132 {XSCALE_CHKPT1, NULL},
133 {XSCALE_DCSR, NULL}, /* DCSR accessed via JTAG or SW */
134 {-1, NULL}, /* TX accessed via JTAG */
135 {-1, NULL}, /* RX accessed via JTAG */
136 {-1, NULL}, /* TXRXCTRL implicit access via JTAG */
137 };
138
139 /* convenience wrapper to access XScale specific registers */
140 static int xscale_set_reg_u32(struct reg *reg, uint32_t value)
141 {
142 uint8_t buf[4];
143
144 buf_set_u32(buf, 0, 32, value);
145
146 return xscale_set_reg(reg, buf);
147 }
148
149 static const char xscale_not[] = "target is not an XScale";
150
151 static int xscale_verify_pointer(struct command_context *cmd_ctx,
152 struct xscale_common *xscale)
153 {
154 if (xscale->common_magic != XSCALE_COMMON_MAGIC) {
155 command_print(cmd_ctx, xscale_not);
156 return ERROR_TARGET_INVALID;
157 }
158 return ERROR_OK;
159 }
160
161 static int xscale_jtag_set_instr(struct jtag_tap *tap, uint32_t new_instr, tap_state_t end_state)
162 {
163 assert (tap != NULL);
164
165 if (buf_get_u32(tap->cur_instr, 0, tap->ir_length) != new_instr)
166 {
167 struct scan_field field;
168 uint8_t scratch[4];
169
170 memset(&field, 0, sizeof field);
171 field.num_bits = tap->ir_length;
172 field.out_value = scratch;
173 buf_set_u32(scratch, 0, field.num_bits, new_instr);
174
175 jtag_add_ir_scan(tap, &field, end_state);
176 }
177
178 return ERROR_OK;
179 }
180
181 static int xscale_read_dcsr(struct target *target)
182 {
183 struct xscale_common *xscale = target_to_xscale(target);
184 int retval;
185 struct scan_field fields[3];
186 uint8_t field0 = 0x0;
187 uint8_t field0_check_value = 0x2;
188 uint8_t field0_check_mask = 0x7;
189 uint8_t field2 = 0x0;
190 uint8_t field2_check_value = 0x0;
191 uint8_t field2_check_mask = 0x1;
192
193 xscale_jtag_set_instr(target->tap,
194 XSCALE_SELDCSR << xscale->xscale_variant,
195 TAP_DRPAUSE);
196
197 buf_set_u32(&field0, 1, 1, xscale->hold_rst);
198 buf_set_u32(&field0, 2, 1, xscale->external_debug_break);
199
200 memset(&fields, 0, sizeof fields);
201
202 fields[0].num_bits = 3;
203 fields[0].out_value = &field0;
204 uint8_t tmp;
205 fields[0].in_value = &tmp;
206
207 fields[1].num_bits = 32;
208 fields[1].in_value = xscale->reg_cache->reg_list[XSCALE_DCSR].value;
209
210 fields[2].num_bits = 1;
211 fields[2].out_value = &field2;
212 uint8_t tmp2;
213 fields[2].in_value = &tmp2;
214
215 jtag_add_dr_scan(target->tap, 3, fields, TAP_DRPAUSE);
216
217 jtag_check_value_mask(fields + 0, &field0_check_value, &field0_check_mask);
218 jtag_check_value_mask(fields + 2, &field2_check_value, &field2_check_mask);
219
220 if ((retval = jtag_execute_queue()) != ERROR_OK)
221 {
222 LOG_ERROR("JTAG error while reading DCSR");
223 return retval;
224 }
225
226 xscale->reg_cache->reg_list[XSCALE_DCSR].dirty = 0;
227 xscale->reg_cache->reg_list[XSCALE_DCSR].valid = 1;
228
229 /* write the register with the value we just read
230 * on this second pass, only the first bit of field0 is guaranteed to be 0)
231 */
232 field0_check_mask = 0x1;
233 fields[1].out_value = xscale->reg_cache->reg_list[XSCALE_DCSR].value;
234 fields[1].in_value = NULL;
235
236 jtag_add_dr_scan(target->tap, 3, fields, TAP_DRPAUSE);
237
238 /* DANGER!!! this must be here. It will make sure that the arguments
239 * to jtag_set_check_value() does not go out of scope! */
240 return jtag_execute_queue();
241 }
242
243
244 static void xscale_getbuf(jtag_callback_data_t arg)
245 {
246 uint8_t *in = (uint8_t *)arg;
247 *((uint32_t *)arg) = buf_get_u32(in, 0, 32);
248 }
249
250 static int xscale_receive(struct target *target, uint32_t *buffer, int num_words)
251 {
252 if (num_words == 0)
253 return ERROR_COMMAND_SYNTAX_ERROR;
254
255 struct xscale_common *xscale = target_to_xscale(target);
256 int retval = ERROR_OK;
257 tap_state_t path[3];
258 struct scan_field fields[3];
259 uint8_t *field0 = malloc(num_words * 1);
260 uint8_t field0_check_value = 0x2;
261 uint8_t field0_check_mask = 0x6;
262 uint32_t *field1 = malloc(num_words * 4);
263 uint8_t field2_check_value = 0x0;
264 uint8_t field2_check_mask = 0x1;
265 int words_done = 0;
266 int words_scheduled = 0;
267 int i;
268
269 path[0] = TAP_DRSELECT;
270 path[1] = TAP_DRCAPTURE;
271 path[2] = TAP_DRSHIFT;
272
273 memset(&fields, 0, sizeof fields);
274
275 fields[0].num_bits = 3;
276 uint8_t tmp;
277 fields[0].in_value = &tmp;
278 fields[0].check_value = &field0_check_value;
279 fields[0].check_mask = &field0_check_mask;
280
281 fields[1].num_bits = 32;
282
283 fields[2].num_bits = 1;
284 uint8_t tmp2;
285 fields[2].in_value = &tmp2;
286 fields[2].check_value = &field2_check_value;
287 fields[2].check_mask = &field2_check_mask;
288
289 xscale_jtag_set_instr(target->tap,
290 XSCALE_DBGTX << xscale->xscale_variant,
291 TAP_IDLE);
292 jtag_add_runtest(1, TAP_IDLE); /* ensures that we're in the TAP_IDLE state as the above could be a no-op */
293
294 /* repeat until all words have been collected */
295 int attempts = 0;
296 while (words_done < num_words)
297 {
298 /* schedule reads */
299 words_scheduled = 0;
300 for (i = words_done; i < num_words; i++)
301 {
302 fields[0].in_value = &field0[i];
303
304 jtag_add_pathmove(3, path);
305
306 fields[1].in_value = (uint8_t *)(field1 + i);
307
308 jtag_add_dr_scan_check(target->tap, 3, fields, TAP_IDLE);
309
310 jtag_add_callback(xscale_getbuf, (jtag_callback_data_t)(field1 + i));
311
312 words_scheduled++;
313 }
314
315 if ((retval = jtag_execute_queue()) != ERROR_OK)
316 {
317 LOG_ERROR("JTAG error while receiving data from debug handler");
318 break;
319 }
320
321 /* examine results */
322 for (i = words_done; i < num_words; i++)
323 {
324 if (!(field0[i] & 1))
325 {
326 /* move backwards if necessary */
327 int j;
328 for (j = i; j < num_words - 1; j++)
329 {
330 field0[j] = field0[j + 1];
331 field1[j] = field1[j + 1];
332 }
333 words_scheduled--;
334 }
335 }
336 if (words_scheduled == 0)
337 {
338 if (attempts++==1000)
339 {
340 LOG_ERROR("Failed to receiving data from debug handler after 1000 attempts");
341 retval = ERROR_TARGET_TIMEOUT;
342 break;
343 }
344 }
345
346 words_done += words_scheduled;
347 }
348
349 for (i = 0; i < num_words; i++)
350 *(buffer++) = buf_get_u32((uint8_t*)&field1[i], 0, 32);
351
352 free(field1);
353
354 return retval;
355 }
356
357 static int xscale_read_tx(struct target *target, int consume)
358 {
359 struct xscale_common *xscale = target_to_xscale(target);
360 tap_state_t path[3];
361 tap_state_t noconsume_path[6];
362 int retval;
363 struct timeval timeout, now;
364 struct scan_field fields[3];
365 uint8_t field0_in = 0x0;
366 uint8_t field0_check_value = 0x2;
367 uint8_t field0_check_mask = 0x6;
368 uint8_t field2_check_value = 0x0;
369 uint8_t field2_check_mask = 0x1;
370
371 xscale_jtag_set_instr(target->tap,
372 XSCALE_DBGTX << xscale->xscale_variant,
373 TAP_IDLE);
374
375 path[0] = TAP_DRSELECT;
376 path[1] = TAP_DRCAPTURE;
377 path[2] = TAP_DRSHIFT;
378
379 noconsume_path[0] = TAP_DRSELECT;
380 noconsume_path[1] = TAP_DRCAPTURE;
381 noconsume_path[2] = TAP_DREXIT1;
382 noconsume_path[3] = TAP_DRPAUSE;
383 noconsume_path[4] = TAP_DREXIT2;
384 noconsume_path[5] = TAP_DRSHIFT;
385
386 memset(&fields, 0, sizeof fields);
387
388 fields[0].num_bits = 3;
389 fields[0].in_value = &field0_in;
390
391 fields[1].num_bits = 32;
392 fields[1].in_value = xscale->reg_cache->reg_list[XSCALE_TX].value;
393
394 fields[2].num_bits = 1;
395 uint8_t tmp;
396 fields[2].in_value = &tmp;
397
398 gettimeofday(&timeout, NULL);
399 timeval_add_time(&timeout, 1, 0);
400
401 for (;;)
402 {
403 /* if we want to consume the register content (i.e. clear TX_READY),
404 * we have to go straight from Capture-DR to Shift-DR
405 * otherwise, we go from Capture-DR to Exit1-DR to Pause-DR
406 */
407 if (consume)
408 jtag_add_pathmove(3, path);
409 else
410 {
411 jtag_add_pathmove(ARRAY_SIZE(noconsume_path), noconsume_path);
412 }
413
414 jtag_add_dr_scan(target->tap, 3, fields, TAP_IDLE);
415
416 jtag_check_value_mask(fields + 0, &field0_check_value, &field0_check_mask);
417 jtag_check_value_mask(fields + 2, &field2_check_value, &field2_check_mask);
418
419 if ((retval = jtag_execute_queue()) != ERROR_OK)
420 {
421 LOG_ERROR("JTAG error while reading TX");
422 return ERROR_TARGET_TIMEOUT;
423 }
424
425 gettimeofday(&now, NULL);
426 if ((now.tv_sec > timeout.tv_sec) || ((now.tv_sec == timeout.tv_sec)&& (now.tv_usec > timeout.tv_usec)))
427 {
428 LOG_ERROR("time out reading TX register");
429 return ERROR_TARGET_TIMEOUT;
430 }
431 if (!((!(field0_in & 1)) && consume))
432 {
433 goto done;
434 }
435 if (debug_level >= 3)
436 {
437 LOG_DEBUG("waiting 100ms");
438 alive_sleep(100); /* avoid flooding the logs */
439 } else
440 {
441 keep_alive();
442 }
443 }
444 done:
445
446 if (!(field0_in & 1))
447 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
448
449 return ERROR_OK;
450 }
451
452 static int xscale_write_rx(struct target *target)
453 {
454 struct xscale_common *xscale = target_to_xscale(target);
455 int retval;
456 struct timeval timeout, now;
457 struct scan_field fields[3];
458 uint8_t field0_out = 0x0;
459 uint8_t field0_in = 0x0;
460 uint8_t field0_check_value = 0x2;
461 uint8_t field0_check_mask = 0x6;
462 uint8_t field2 = 0x0;
463 uint8_t field2_check_value = 0x0;
464 uint8_t field2_check_mask = 0x1;
465
466 xscale_jtag_set_instr(target->tap,
467 XSCALE_DBGRX << xscale->xscale_variant,
468 TAP_IDLE);
469
470 memset(&fields, 0, sizeof fields);
471
472 fields[0].num_bits = 3;
473 fields[0].out_value = &field0_out;
474 fields[0].in_value = &field0_in;
475
476 fields[1].num_bits = 32;
477 fields[1].out_value = xscale->reg_cache->reg_list[XSCALE_RX].value;
478
479 fields[2].num_bits = 1;
480 fields[2].out_value = &field2;
481 uint8_t tmp;
482 fields[2].in_value = &tmp;
483
484 gettimeofday(&timeout, NULL);
485 timeval_add_time(&timeout, 1, 0);
486
487 /* poll until rx_read is low */
488 LOG_DEBUG("polling RX");
489 for (;;)
490 {
491 jtag_add_dr_scan(target->tap, 3, fields, TAP_IDLE);
492
493 jtag_check_value_mask(fields + 0, &field0_check_value, &field0_check_mask);
494 jtag_check_value_mask(fields + 2, &field2_check_value, &field2_check_mask);
495
496 if ((retval = jtag_execute_queue()) != ERROR_OK)
497 {
498 LOG_ERROR("JTAG error while writing RX");
499 return retval;
500 }
501
502 gettimeofday(&now, NULL);
503 if ((now.tv_sec > timeout.tv_sec) || ((now.tv_sec == timeout.tv_sec)&& (now.tv_usec > timeout.tv_usec)))
504 {
505 LOG_ERROR("time out writing RX register");
506 return ERROR_TARGET_TIMEOUT;
507 }
508 if (!(field0_in & 1))
509 goto done;
510 if (debug_level >= 3)
511 {
512 LOG_DEBUG("waiting 100ms");
513 alive_sleep(100); /* avoid flooding the logs */
514 } else
515 {
516 keep_alive();
517 }
518 }
519 done:
520
521 /* set rx_valid */
522 field2 = 0x1;
523 jtag_add_dr_scan(target->tap, 3, fields, TAP_IDLE);
524
525 if ((retval = jtag_execute_queue()) != ERROR_OK)
526 {
527 LOG_ERROR("JTAG error while writing RX");
528 return retval;
529 }
530
531 return ERROR_OK;
532 }
533
534 /* send count elements of size byte to the debug handler */
535 static int xscale_send(struct target *target, const uint8_t *buffer, int count, int size)
536 {
537 struct xscale_common *xscale = target_to_xscale(target);
538 uint32_t t[3];
539 int bits[3];
540 int retval;
541 int done_count = 0;
542
543 xscale_jtag_set_instr(target->tap,
544 XSCALE_DBGRX << xscale->xscale_variant,
545 TAP_IDLE);
546
547 bits[0]=3;
548 t[0]=0;
549 bits[1]=32;
550 t[2]=1;
551 bits[2]=1;
552 int endianness = target->endianness;
553 while (done_count++ < count)
554 {
555 switch (size)
556 {
557 case 4:
558 if (endianness == TARGET_LITTLE_ENDIAN)
559 {
560 t[1]=le_to_h_u32(buffer);
561 } else
562 {
563 t[1]=be_to_h_u32(buffer);
564 }
565 break;
566 case 2:
567 if (endianness == TARGET_LITTLE_ENDIAN)
568 {
569 t[1]=le_to_h_u16(buffer);
570 } else
571 {
572 t[1]=be_to_h_u16(buffer);
573 }
574 break;
575 case 1:
576 t[1]=buffer[0];
577 break;
578 default:
579 LOG_ERROR("BUG: size neither 4, 2 nor 1");
580 return ERROR_COMMAND_SYNTAX_ERROR;
581 }
582 jtag_add_dr_out(target->tap,
583 3,
584 bits,
585 t,
586 TAP_IDLE);
587 buffer += size;
588 }
589
590 if ((retval = jtag_execute_queue()) != ERROR_OK)
591 {
592 LOG_ERROR("JTAG error while sending data to debug handler");
593 return retval;
594 }
595
596 return ERROR_OK;
597 }
598
599 static int xscale_send_u32(struct target *target, uint32_t value)
600 {
601 struct xscale_common *xscale = target_to_xscale(target);
602
603 buf_set_u32(xscale->reg_cache->reg_list[XSCALE_RX].value, 0, 32, value);
604 return xscale_write_rx(target);
605 }
606
607 static int xscale_write_dcsr(struct target *target, int hold_rst, int ext_dbg_brk)
608 {
609 struct xscale_common *xscale = target_to_xscale(target);
610 int retval;
611 struct scan_field fields[3];
612 uint8_t field0 = 0x0;
613 uint8_t field0_check_value = 0x2;
614 uint8_t field0_check_mask = 0x7;
615 uint8_t field2 = 0x0;
616 uint8_t field2_check_value = 0x0;
617 uint8_t field2_check_mask = 0x1;
618
619 if (hold_rst != -1)
620 xscale->hold_rst = hold_rst;
621
622 if (ext_dbg_brk != -1)
623 xscale->external_debug_break = ext_dbg_brk;
624
625 xscale_jtag_set_instr(target->tap,
626 XSCALE_SELDCSR << xscale->xscale_variant,
627 TAP_IDLE);
628
629 buf_set_u32(&field0, 1, 1, xscale->hold_rst);
630 buf_set_u32(&field0, 2, 1, xscale->external_debug_break);
631
632 memset(&fields, 0, sizeof fields);
633
634 fields[0].num_bits = 3;
635 fields[0].out_value = &field0;
636 uint8_t tmp;
637 fields[0].in_value = &tmp;
638
639 fields[1].num_bits = 32;
640 fields[1].out_value = xscale->reg_cache->reg_list[XSCALE_DCSR].value;
641
642 fields[2].num_bits = 1;
643 fields[2].out_value = &field2;
644 uint8_t tmp2;
645 fields[2].in_value = &tmp2;
646
647 jtag_add_dr_scan(target->tap, 3, fields, TAP_IDLE);
648
649 jtag_check_value_mask(fields + 0, &field0_check_value, &field0_check_mask);
650 jtag_check_value_mask(fields + 2, &field2_check_value, &field2_check_mask);
651
652 if ((retval = jtag_execute_queue()) != ERROR_OK)
653 {
654 LOG_ERROR("JTAG error while writing DCSR");
655 return retval;
656 }
657
658 xscale->reg_cache->reg_list[XSCALE_DCSR].dirty = 0;
659 xscale->reg_cache->reg_list[XSCALE_DCSR].valid = 1;
660
661 return ERROR_OK;
662 }
663
664 /* parity of the number of bits 0 if even; 1 if odd. for 32 bit words */
665 static unsigned int parity (unsigned int v)
666 {
667 // unsigned int ov = v;
668 v ^= v >> 16;
669 v ^= v >> 8;
670 v ^= v >> 4;
671 v &= 0xf;
672 // LOG_DEBUG("parity of 0x%x is %i", ov, (0x6996 >> v) & 1);
673 return (0x6996 >> v) & 1;
674 }
675
676 static int xscale_load_ic(struct target *target, uint32_t va, uint32_t buffer[8])
677 {
678 struct xscale_common *xscale = target_to_xscale(target);
679 uint8_t packet[4];
680 uint8_t cmd;
681 int word;
682 struct scan_field fields[2];
683
684 LOG_DEBUG("loading miniIC at 0x%8.8" PRIx32 "", va);
685
686 /* LDIC into IR */
687 xscale_jtag_set_instr(target->tap,
688 XSCALE_LDIC << xscale->xscale_variant,
689 TAP_IDLE);
690
691 /* CMD is b011 to load a cacheline into the Mini ICache.
692 * Loading into the main ICache is deprecated, and unused.
693 * It's followed by three zero bits, and 27 address bits.
694 */
695 buf_set_u32(&cmd, 0, 6, 0x3);
696
697 /* virtual address of desired cache line */
698 buf_set_u32(packet, 0, 27, va >> 5);
699
700 memset(&fields, 0, sizeof fields);
701
702 fields[0].num_bits = 6;
703 fields[0].out_value = &cmd;
704
705 fields[1].num_bits = 27;
706 fields[1].out_value = packet;
707
708 jtag_add_dr_scan(target->tap, 2, fields, TAP_IDLE);
709
710 /* rest of packet is a cacheline: 8 instructions, with parity */
711 fields[0].num_bits = 32;
712 fields[0].out_value = packet;
713
714 fields[1].num_bits = 1;
715 fields[1].out_value = &cmd;
716
717 for (word = 0; word < 8; word++)
718 {
719 buf_set_u32(packet, 0, 32, buffer[word]);
720
721 uint32_t value;
722 memcpy(&value, packet, sizeof(uint32_t));
723 cmd = parity(value);
724
725 jtag_add_dr_scan(target->tap, 2, fields, TAP_IDLE);
726 }
727
728 return jtag_execute_queue();
729 }
730
731 static int xscale_invalidate_ic_line(struct target *target, uint32_t va)
732 {
733 struct xscale_common *xscale = target_to_xscale(target);
734 uint8_t packet[4];
735 uint8_t cmd;
736 struct scan_field fields[2];
737
738 xscale_jtag_set_instr(target->tap,
739 XSCALE_LDIC << xscale->xscale_variant,
740 TAP_IDLE);
741
742 /* CMD for invalidate IC line b000, bits [6:4] b000 */
743 buf_set_u32(&cmd, 0, 6, 0x0);
744
745 /* virtual address of desired cache line */
746 buf_set_u32(packet, 0, 27, va >> 5);
747
748 memset(&fields, 0, sizeof fields);
749
750 fields[0].num_bits = 6;
751 fields[0].out_value = &cmd;
752
753 fields[1].num_bits = 27;
754 fields[1].out_value = packet;
755
756 jtag_add_dr_scan(target->tap, 2, fields, TAP_IDLE);
757
758 return ERROR_OK;
759 }
760
761 static int xscale_update_vectors(struct target *target)
762 {
763 struct xscale_common *xscale = target_to_xscale(target);
764 int i;
765 int retval;
766
767 uint32_t low_reset_branch, high_reset_branch;
768
769 for (i = 1; i < 8; i++)
770 {
771 /* if there's a static vector specified for this exception, override */
772 if (xscale->static_high_vectors_set & (1 << i))
773 {
774 xscale->high_vectors[i] = xscale->static_high_vectors[i];
775 }
776 else
777 {
778 retval = target_read_u32(target, 0xffff0000 + 4*i, &xscale->high_vectors[i]);
779 if (retval == ERROR_TARGET_TIMEOUT)
780 return retval;
781 if (retval != ERROR_OK)
782 {
783 /* Some of these reads will fail as part of normal execution */
784 xscale->high_vectors[i] = ARMV4_5_B(0xfffffe, 0);
785 }
786 }
787 }
788
789 for (i = 1; i < 8; i++)
790 {
791 if (xscale->static_low_vectors_set & (1 << i))
792 {
793 xscale->low_vectors[i] = xscale->static_low_vectors[i];
794 }
795 else
796 {
797 retval = target_read_u32(target, 0x0 + 4*i, &xscale->low_vectors[i]);
798 if (retval == ERROR_TARGET_TIMEOUT)
799 return retval;
800 if (retval != ERROR_OK)
801 {
802 /* Some of these reads will fail as part of normal execution */
803 xscale->low_vectors[i] = ARMV4_5_B(0xfffffe, 0);
804 }
805 }
806 }
807
808 /* calculate branches to debug handler */
809 low_reset_branch = (xscale->handler_address + 0x20 - 0x0 - 0x8) >> 2;
810 high_reset_branch = (xscale->handler_address + 0x20 - 0xffff0000 - 0x8) >> 2;
811
812 xscale->low_vectors[0] = ARMV4_5_B((low_reset_branch & 0xffffff), 0);
813 xscale->high_vectors[0] = ARMV4_5_B((high_reset_branch & 0xffffff), 0);
814
815 /* invalidate and load exception vectors in mini i-cache */
816 xscale_invalidate_ic_line(target, 0x0);
817 xscale_invalidate_ic_line(target, 0xffff0000);
818
819 xscale_load_ic(target, 0x0, xscale->low_vectors);
820 xscale_load_ic(target, 0xffff0000, xscale->high_vectors);
821
822 return ERROR_OK;
823 }
824
825 static int xscale_arch_state(struct target *target)
826 {
827 struct xscale_common *xscale = target_to_xscale(target);
828 struct arm *armv4_5 = &xscale->armv4_5_common;
829
830 static const char *state[] =
831 {
832 "disabled", "enabled"
833 };
834
835 static const char *arch_dbg_reason[] =
836 {
837 "", "\n(processor reset)", "\n(trace buffer full)"
838 };
839
840 if (armv4_5->common_magic != ARM_COMMON_MAGIC)
841 {
842 LOG_ERROR("BUG: called for a non-ARMv4/5 target");
843 return ERROR_COMMAND_SYNTAX_ERROR;
844 }
845
846 arm_arch_state(target);
847 LOG_USER("MMU: %s, D-Cache: %s, I-Cache: %s%s",
848 state[xscale->armv4_5_mmu.mmu_enabled],
849 state[xscale->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled],
850 state[xscale->armv4_5_mmu.armv4_5_cache.i_cache_enabled],
851 arch_dbg_reason[xscale->arch_debug_reason]);
852
853 return ERROR_OK;
854 }
855
856 static int xscale_poll(struct target *target)
857 {
858 int retval = ERROR_OK;
859
860 if ((target->state == TARGET_RUNNING) || (target->state == TARGET_DEBUG_RUNNING))
861 {
862 enum target_state previous_state = target->state;
863 if ((retval = xscale_read_tx(target, 0)) == ERROR_OK)
864 {
865
866 /* there's data to read from the tx register, we entered debug state */
867 target->state = TARGET_HALTED;
868
869 /* process debug entry, fetching current mode regs */
870 retval = xscale_debug_entry(target);
871 }
872 else if (retval != ERROR_TARGET_RESOURCE_NOT_AVAILABLE)
873 {
874 LOG_USER("error while polling TX register, reset CPU");
875 /* here we "lie" so GDB won't get stuck and a reset can be perfomed */
876 target->state = TARGET_HALTED;
877 }
878
879 /* debug_entry could have overwritten target state (i.e. immediate resume)
880 * don't signal event handlers in that case
881 */
882 if (target->state != TARGET_HALTED)
883 return ERROR_OK;
884
885 /* if target was running, signal that we halted
886 * otherwise we reentered from debug execution */
887 if (previous_state == TARGET_RUNNING)
888 target_call_event_callbacks(target, TARGET_EVENT_HALTED);
889 else
890 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_HALTED);
891 }
892
893 return retval;
894 }
895
896 static int xscale_debug_entry(struct target *target)
897 {
898 struct xscale_common *xscale = target_to_xscale(target);
899 struct arm *armv4_5 = &xscale->armv4_5_common;
900 uint32_t pc;
901 uint32_t buffer[10];
902 unsigned i;
903 int retval;
904 uint32_t moe;
905
906 /* clear external dbg break (will be written on next DCSR read) */
907 xscale->external_debug_break = 0;
908 if ((retval = xscale_read_dcsr(target)) != ERROR_OK)
909 return retval;
910
911 /* get r0, pc, r1 to r7 and cpsr */
912 if ((retval = xscale_receive(target, buffer, 10)) != ERROR_OK)
913 return retval;
914
915 /* move r0 from buffer to register cache */
916 buf_set_u32(armv4_5->core_cache->reg_list[0].value, 0, 32, buffer[0]);
917 armv4_5->core_cache->reg_list[0].dirty = 1;
918 armv4_5->core_cache->reg_list[0].valid = 1;
919 LOG_DEBUG("r0: 0x%8.8" PRIx32 "", buffer[0]);
920
921 /* move pc from buffer to register cache */
922 buf_set_u32(armv4_5->pc->value, 0, 32, buffer[1]);
923 armv4_5->pc->dirty = 1;
924 armv4_5->pc->valid = 1;
925 LOG_DEBUG("pc: 0x%8.8" PRIx32 "", buffer[1]);
926
927 /* move data from buffer to register cache */
928 for (i = 1; i <= 7; i++)
929 {
930 buf_set_u32(armv4_5->core_cache->reg_list[i].value, 0, 32, buffer[1 + i]);
931 armv4_5->core_cache->reg_list[i].dirty = 1;
932 armv4_5->core_cache->reg_list[i].valid = 1;
933 LOG_DEBUG("r%i: 0x%8.8" PRIx32 "", i, buffer[i + 1]);
934 }
935
936 arm_set_cpsr(armv4_5, buffer[9]);
937 LOG_DEBUG("cpsr: 0x%8.8" PRIx32 "", buffer[9]);
938
939 if (!is_arm_mode(armv4_5->core_mode))
940 {
941 target->state = TARGET_UNKNOWN;
942 LOG_ERROR("cpsr contains invalid mode value - communication failure");
943 return ERROR_TARGET_FAILURE;
944 }
945 LOG_DEBUG("target entered debug state in %s mode",
946 arm_mode_name(armv4_5->core_mode));
947
948 /* get banked registers, r8 to r14, and spsr if not in USR/SYS mode */
949 if (armv4_5->spsr) {
950 xscale_receive(target, buffer, 8);
951 buf_set_u32(armv4_5->spsr->value, 0, 32, buffer[7]);
952 armv4_5->spsr->dirty = false;
953 armv4_5->spsr->valid = true;
954 }
955 else
956 {
957 /* r8 to r14, but no spsr */
958 xscale_receive(target, buffer, 7);
959 }
960
961 /* move data from buffer to right banked register in cache */
962 for (i = 8; i <= 14; i++)
963 {
964 struct reg *r = arm_reg_current(armv4_5, i);
965
966 buf_set_u32(r->value, 0, 32, buffer[i - 8]);
967 r->dirty = false;
968 r->valid = true;
969 }
970
971 /* mark xscale regs invalid to ensure they are retrieved from the
972 * debug handler if requested */
973 for (i = 0; i < xscale->reg_cache->num_regs; i++)
974 xscale->reg_cache->reg_list[i].valid = 0;
975
976 /* examine debug reason */
977 xscale_read_dcsr(target);
978 moe = buf_get_u32(xscale->reg_cache->reg_list[XSCALE_DCSR].value, 2, 3);
979
980 /* stored PC (for calculating fixup) */
981 pc = buf_get_u32(armv4_5->pc->value, 0, 32);
982
983 switch (moe)
984 {
985 case 0x0: /* Processor reset */
986 target->debug_reason = DBG_REASON_DBGRQ;
987 xscale->arch_debug_reason = XSCALE_DBG_REASON_RESET;
988 pc -= 4;
989 break;
990 case 0x1: /* Instruction breakpoint hit */
991 target->debug_reason = DBG_REASON_BREAKPOINT;
992 xscale->arch_debug_reason = XSCALE_DBG_REASON_GENERIC;
993 pc -= 4;
994 break;
995 case 0x2: /* Data breakpoint hit */
996 target->debug_reason = DBG_REASON_WATCHPOINT;
997 xscale->arch_debug_reason = XSCALE_DBG_REASON_GENERIC;
998 pc -= 4;
999 break;
1000 case 0x3: /* BKPT instruction executed */
1001 target->debug_reason = DBG_REASON_BREAKPOINT;
1002 xscale->arch_debug_reason = XSCALE_DBG_REASON_GENERIC;
1003 pc -= 4;
1004 break;
1005 case 0x4: /* Ext. debug event */
1006 target->debug_reason = DBG_REASON_DBGRQ;
1007 xscale->arch_debug_reason = XSCALE_DBG_REASON_GENERIC;
1008 pc -= 4;
1009 break;
1010 case 0x5: /* Vector trap occured */
1011 target->debug_reason = DBG_REASON_BREAKPOINT;
1012 xscale->arch_debug_reason = XSCALE_DBG_REASON_GENERIC;
1013 pc -= 4;
1014 break;
1015 case 0x6: /* Trace buffer full break */
1016 target->debug_reason = DBG_REASON_DBGRQ;
1017 xscale->arch_debug_reason = XSCALE_DBG_REASON_TB_FULL;
1018 pc -= 4;
1019 break;
1020 case 0x7: /* Reserved (may flag Hot-Debug support) */
1021 default:
1022 LOG_ERROR("Method of Entry is 'Reserved'");
1023 exit(-1);
1024 break;
1025 }
1026
1027 /* apply PC fixup */
1028 buf_set_u32(armv4_5->pc->value, 0, 32, pc);
1029
1030 /* on the first debug entry, identify cache type */
1031 if (xscale->armv4_5_mmu.armv4_5_cache.ctype == -1)
1032 {
1033 uint32_t cache_type_reg;
1034
1035 /* read cp15 cache type register */
1036 xscale_get_reg(&xscale->reg_cache->reg_list[XSCALE_CACHETYPE]);
1037 cache_type_reg = buf_get_u32(xscale->reg_cache->reg_list[XSCALE_CACHETYPE].value, 0, 32);
1038
1039 armv4_5_identify_cache(cache_type_reg, &xscale->armv4_5_mmu.armv4_5_cache);
1040 }
1041
1042 /* examine MMU and Cache settings */
1043 /* read cp15 control register */
1044 xscale_get_reg(&xscale->reg_cache->reg_list[XSCALE_CTRL]);
1045 xscale->cp15_control_reg = buf_get_u32(xscale->reg_cache->reg_list[XSCALE_CTRL].value, 0, 32);
1046 xscale->armv4_5_mmu.mmu_enabled = (xscale->cp15_control_reg & 0x1U) ? 1 : 0;
1047 xscale->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = (xscale->cp15_control_reg & 0x4U) ? 1 : 0;
1048 xscale->armv4_5_mmu.armv4_5_cache.i_cache_enabled = (xscale->cp15_control_reg & 0x1000U) ? 1 : 0;
1049
1050 /* tracing enabled, read collected trace data */
1051 if (xscale->trace.mode != XSCALE_TRACE_DISABLED)
1052 {
1053 xscale_read_trace(target);
1054
1055 /* Resume if entered debug due to buffer fill and we're still collecting
1056 * trace data. Note that a debug exception due to trace buffer full
1057 * can only happen in fill mode. */
1058 if (xscale->arch_debug_reason == XSCALE_DBG_REASON_TB_FULL)
1059 {
1060 if (--xscale->trace.fill_counter > 0)
1061 xscale_resume(target, 1, 0x0, 1, 0);
1062 }
1063 else /* entered debug for other reason; reset counter */
1064 xscale->trace.fill_counter = 0;
1065 }
1066
1067 return ERROR_OK;
1068 }
1069
1070 static int xscale_halt(struct target *target)
1071 {
1072 struct xscale_common *xscale = target_to_xscale(target);
1073
1074 LOG_DEBUG("target->state: %s",
1075 target_state_name(target));
1076
1077 if (target->state == TARGET_HALTED)
1078 {
1079 LOG_DEBUG("target was already halted");
1080 return ERROR_OK;
1081 }
1082 else if (target->state == TARGET_UNKNOWN)
1083 {
1084 /* this must not happen for a xscale target */
1085 LOG_ERROR("target was in unknown state when halt was requested");
1086 return ERROR_TARGET_INVALID;
1087 }
1088 else if (target->state == TARGET_RESET)
1089 {
1090 LOG_DEBUG("target->state == TARGET_RESET");
1091 }
1092 else
1093 {
1094 /* assert external dbg break */
1095 xscale->external_debug_break = 1;
1096 xscale_read_dcsr(target);
1097
1098 target->debug_reason = DBG_REASON_DBGRQ;
1099 }
1100
1101 return ERROR_OK;
1102 }
1103
1104 static int xscale_enable_single_step(struct target *target, uint32_t next_pc)
1105 {
1106 struct xscale_common *xscale = target_to_xscale(target);
1107 struct reg *ibcr0 = &xscale->reg_cache->reg_list[XSCALE_IBCR0];
1108 int retval;
1109
1110 if (xscale->ibcr0_used)
1111 {
1112 struct breakpoint *ibcr0_bp = breakpoint_find(target, buf_get_u32(ibcr0->value, 0, 32) & 0xfffffffe);
1113
1114 if (ibcr0_bp)
1115 {
1116 xscale_unset_breakpoint(target, ibcr0_bp);
1117 }
1118 else
1119 {
1120 LOG_ERROR("BUG: xscale->ibcr0_used is set, but no breakpoint with that address found");
1121 exit(-1);
1122 }
1123 }
1124
1125 if ((retval = xscale_set_reg_u32(ibcr0, next_pc | 0x1)) != ERROR_OK)
1126 return retval;
1127
1128 return ERROR_OK;
1129 }
1130
1131 static int xscale_disable_single_step(struct target *target)
1132 {
1133 struct xscale_common *xscale = target_to_xscale(target);
1134 struct reg *ibcr0 = &xscale->reg_cache->reg_list[XSCALE_IBCR0];
1135 int retval;
1136
1137 if ((retval = xscale_set_reg_u32(ibcr0, 0x0)) != ERROR_OK)
1138 return retval;
1139
1140 return ERROR_OK;
1141 }
1142
1143 static void xscale_enable_watchpoints(struct target *target)
1144 {
1145 struct watchpoint *watchpoint = target->watchpoints;
1146
1147 while (watchpoint)
1148 {
1149 if (watchpoint->set == 0)
1150 xscale_set_watchpoint(target, watchpoint);
1151 watchpoint = watchpoint->next;
1152 }
1153 }
1154
1155 static void xscale_enable_breakpoints(struct target *target)
1156 {
1157 struct breakpoint *breakpoint = target->breakpoints;
1158
1159 /* set any pending breakpoints */
1160 while (breakpoint)
1161 {
1162 if (breakpoint->set == 0)
1163 xscale_set_breakpoint(target, breakpoint);
1164 breakpoint = breakpoint->next;
1165 }
1166 }
1167
1168 static void xscale_free_trace_data(struct xscale_common *xscale)
1169 {
1170 struct xscale_trace_data *td = xscale->trace.data;
1171 while (td)
1172 {
1173 struct xscale_trace_data *next_td = td->next;
1174 if (td->entries)
1175 free(td->entries);
1176 free(td);
1177 td = next_td;
1178 }
1179 xscale->trace.data = NULL;
1180 }
1181
1182 static int xscale_resume(struct target *target, int current,
1183 uint32_t address, int handle_breakpoints, int debug_execution)
1184 {
1185 struct xscale_common *xscale = target_to_xscale(target);
1186 struct arm *armv4_5 = &xscale->armv4_5_common;
1187 uint32_t current_pc;
1188 int retval;
1189 int i;
1190
1191 LOG_DEBUG("-");
1192
1193 if (target->state != TARGET_HALTED)
1194 {
1195 LOG_WARNING("target not halted");
1196 return ERROR_TARGET_NOT_HALTED;
1197 }
1198
1199 if (!debug_execution)
1200 {
1201 target_free_all_working_areas(target);
1202 }
1203
1204 /* update vector tables */
1205 if ((retval = xscale_update_vectors(target)) != ERROR_OK)
1206 return retval;
1207
1208 /* current = 1: continue on current pc, otherwise continue at <address> */
1209 if (!current)
1210 buf_set_u32(armv4_5->pc->value, 0, 32, address);
1211
1212 current_pc = buf_get_u32(armv4_5->pc->value, 0, 32);
1213
1214 /* if we're at the reset vector, we have to simulate the branch */
1215 if (current_pc == 0x0)
1216 {
1217 arm_simulate_step(target, NULL);
1218 current_pc = buf_get_u32(armv4_5->pc->value, 0, 32);
1219 }
1220
1221 /* the front-end may request us not to handle breakpoints */
1222 if (handle_breakpoints)
1223 {
1224 struct breakpoint *breakpoint;
1225 breakpoint = breakpoint_find(target,
1226 buf_get_u32(armv4_5->pc->value, 0, 32));
1227 if (breakpoint != NULL)
1228 {
1229 uint32_t next_pc;
1230 enum trace_mode saved_trace_mode;
1231
1232 /* there's a breakpoint at the current PC, we have to step over it */
1233 LOG_DEBUG("unset breakpoint at 0x%8.8" PRIx32 "", breakpoint->address);
1234 xscale_unset_breakpoint(target, breakpoint);
1235
1236 /* calculate PC of next instruction */
1237 if ((retval = arm_simulate_step(target, &next_pc)) != ERROR_OK)
1238 {
1239 uint32_t current_opcode;
1240 target_read_u32(target, current_pc, &current_opcode);
1241 LOG_ERROR("BUG: couldn't calculate PC of next instruction, current opcode was 0x%8.8" PRIx32 "", current_opcode);
1242 }
1243
1244 LOG_DEBUG("enable single-step");
1245 xscale_enable_single_step(target, next_pc);
1246
1247 /* restore banked registers */
1248 retval = xscale_restore_banked(target);
1249 if (retval != ERROR_OK)
1250 return retval;
1251
1252 /* send resume request */
1253 xscale_send_u32(target, 0x30);
1254
1255 /* send CPSR */
1256 xscale_send_u32(target,
1257 buf_get_u32(armv4_5->cpsr->value, 0, 32));
1258 LOG_DEBUG("writing cpsr with value 0x%8.8" PRIx32,
1259 buf_get_u32(armv4_5->cpsr->value, 0, 32));
1260
1261 for (i = 7; i >= 0; i--)
1262 {
1263 /* send register */
1264 xscale_send_u32(target, buf_get_u32(armv4_5->core_cache->reg_list[i].value, 0, 32));
1265 LOG_DEBUG("writing r%i with value 0x%8.8" PRIx32 "", i, buf_get_u32(armv4_5->core_cache->reg_list[i].value, 0, 32));
1266 }
1267
1268 /* send PC */
1269 xscale_send_u32(target,
1270 buf_get_u32(armv4_5->pc->value, 0, 32));
1271 LOG_DEBUG("writing PC with value 0x%8.8" PRIx32,
1272 buf_get_u32(armv4_5->pc->value, 0, 32));
1273
1274 /* disable trace data collection in xscale_debug_entry() */
1275 saved_trace_mode = xscale->trace.mode;
1276 xscale->trace.mode = XSCALE_TRACE_DISABLED;
1277
1278 /* wait for and process debug entry */
1279 xscale_debug_entry(target);
1280
1281 /* re-enable trace buffer, if enabled previously */
1282 xscale->trace.mode = saved_trace_mode;
1283
1284 LOG_DEBUG("disable single-step");
1285 xscale_disable_single_step(target);
1286
1287 LOG_DEBUG("set breakpoint at 0x%8.8" PRIx32 "", breakpoint->address);
1288 xscale_set_breakpoint(target, breakpoint);
1289 }
1290 }
1291
1292 /* enable any pending breakpoints and watchpoints */
1293 xscale_enable_breakpoints(target);
1294 xscale_enable_watchpoints(target);
1295
1296 /* restore banked registers */
1297 retval = xscale_restore_banked(target);
1298 if (retval != ERROR_OK)
1299 return retval;
1300
1301 /* send resume request (command 0x30 or 0x31)
1302 * clean the trace buffer if it is to be enabled (0x62) */
1303 if (xscale->trace.mode != XSCALE_TRACE_DISABLED)
1304 {
1305 if (xscale->trace.mode == XSCALE_TRACE_FILL)
1306 {
1307 /* If trace enabled in fill mode and starting collection of new set
1308 * of buffers, initialize buffer counter and free previous buffers */
1309 if (xscale->trace.fill_counter == 0)
1310 {
1311 xscale->trace.fill_counter = xscale->trace.buffer_fill;
1312 xscale_free_trace_data(xscale);
1313 }
1314 }
1315 else /* wrap mode; free previous buffer */
1316 xscale_free_trace_data(xscale);
1317
1318 xscale_send_u32(target, 0x62);
1319 xscale_send_u32(target, 0x31);
1320 }
1321 else
1322 xscale_send_u32(target, 0x30);
1323
1324 /* send CPSR */
1325 xscale_send_u32(target, buf_get_u32(armv4_5->cpsr->value, 0, 32));
1326 LOG_DEBUG("writing cpsr with value 0x%8.8" PRIx32,
1327 buf_get_u32(armv4_5->cpsr->value, 0, 32));
1328
1329 for (i = 7; i >= 0; i--)
1330 {
1331 /* send register */
1332 xscale_send_u32(target, buf_get_u32(armv4_5->core_cache->reg_list[i].value, 0, 32));
1333 LOG_DEBUG("writing r%i with value 0x%8.8" PRIx32 "", i, buf_get_u32(armv4_5->core_cache->reg_list[i].value, 0, 32));
1334 }
1335
1336 /* send PC */
1337 xscale_send_u32(target, buf_get_u32(armv4_5->pc->value, 0, 32));
1338 LOG_DEBUG("wrote PC with value 0x%8.8" PRIx32,
1339 buf_get_u32(armv4_5->pc->value, 0, 32));
1340
1341 target->debug_reason = DBG_REASON_NOTHALTED;
1342
1343 if (!debug_execution)
1344 {
1345 /* registers are now invalid */
1346 register_cache_invalidate(armv4_5->core_cache);
1347 target->state = TARGET_RUNNING;
1348 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
1349 }
1350 else
1351 {
1352 target->state = TARGET_DEBUG_RUNNING;
1353 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
1354 }
1355
1356 LOG_DEBUG("target resumed");
1357
1358 return ERROR_OK;
1359 }
1360
1361 static int xscale_step_inner(struct target *target, int current,
1362 uint32_t address, int handle_breakpoints)
1363 {
1364 struct xscale_common *xscale = target_to_xscale(target);
1365 struct arm *armv4_5 = &xscale->armv4_5_common;
1366 uint32_t next_pc;
1367 int retval;
1368 int i;
1369
1370 target->debug_reason = DBG_REASON_SINGLESTEP;
1371
1372 /* calculate PC of next instruction */
1373 if ((retval = arm_simulate_step(target, &next_pc)) != ERROR_OK)
1374 {
1375 uint32_t current_opcode, current_pc;
1376 current_pc = buf_get_u32(armv4_5->pc->value, 0, 32);
1377
1378 target_read_u32(target, current_pc, &current_opcode);
1379 LOG_ERROR("BUG: couldn't calculate PC of next instruction, current opcode was 0x%8.8" PRIx32 "", current_opcode);
1380 return retval;
1381 }
1382
1383 LOG_DEBUG("enable single-step");
1384 if ((retval = xscale_enable_single_step(target, next_pc)) != ERROR_OK)
1385 return retval;
1386
1387 /* restore banked registers */
1388 if ((retval = xscale_restore_banked(target)) != ERROR_OK)
1389 return retval;
1390
1391 /* send resume request (command 0x30 or 0x31)
1392 * clean the trace buffer if it is to be enabled (0x62) */
1393 if (xscale->trace.mode != XSCALE_TRACE_DISABLED)
1394 {
1395 if ((retval = xscale_send_u32(target, 0x62)) != ERROR_OK)
1396 return retval;
1397 if ((retval = xscale_send_u32(target, 0x31)) != ERROR_OK)
1398 return retval;
1399 }
1400 else
1401 if ((retval = xscale_send_u32(target, 0x30)) != ERROR_OK)
1402 return retval;
1403
1404 /* send CPSR */
1405 retval = xscale_send_u32(target,
1406 buf_get_u32(armv4_5->cpsr->value, 0, 32));
1407 if (retval != ERROR_OK)
1408 return retval;
1409 LOG_DEBUG("writing cpsr with value 0x%8.8" PRIx32,
1410 buf_get_u32(armv4_5->cpsr->value, 0, 32));
1411
1412 for (i = 7; i >= 0; i--)
1413 {
1414 /* send register */
1415 if ((retval = xscale_send_u32(target, buf_get_u32(armv4_5->core_cache->reg_list[i].value, 0, 32))) != ERROR_OK)
1416 return retval;
1417 LOG_DEBUG("writing r%i with value 0x%8.8" PRIx32 "", i, buf_get_u32(armv4_5->core_cache->reg_list[i].value, 0, 32));
1418 }
1419
1420 /* send PC */
1421 retval = xscale_send_u32(target,
1422 buf_get_u32(armv4_5->pc->value, 0, 32));
1423 if (retval != ERROR_OK)
1424 return retval;
1425 LOG_DEBUG("wrote PC with value 0x%8.8" PRIx32,
1426 buf_get_u32(armv4_5->pc->value, 0, 32));
1427
1428 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
1429
1430 /* registers are now invalid */
1431 register_cache_invalidate(armv4_5->core_cache);
1432
1433 /* wait for and process debug entry */
1434 if ((retval = xscale_debug_entry(target)) != ERROR_OK)
1435 return retval;
1436
1437 LOG_DEBUG("disable single-step");
1438 if ((retval = xscale_disable_single_step(target)) != ERROR_OK)
1439 return retval;
1440
1441 target_call_event_callbacks(target, TARGET_EVENT_HALTED);
1442
1443 return ERROR_OK;
1444 }
1445
1446 static int xscale_step(struct target *target, int current,
1447 uint32_t address, int handle_breakpoints)
1448 {
1449 struct arm *armv4_5 = target_to_arm(target);
1450 struct breakpoint *breakpoint = NULL;
1451
1452 uint32_t current_pc;
1453 int retval;
1454
1455 if (target->state != TARGET_HALTED)
1456 {
1457 LOG_WARNING("target not halted");
1458 return ERROR_TARGET_NOT_HALTED;
1459 }
1460
1461 /* current = 1: continue on current pc, otherwise continue at <address> */
1462 if (!current)
1463 buf_set_u32(armv4_5->pc->value, 0, 32, address);
1464
1465 current_pc = buf_get_u32(armv4_5->pc->value, 0, 32);
1466
1467 /* if we're at the reset vector, we have to simulate the step */
1468 if (current_pc == 0x0)
1469 {
1470 if ((retval = arm_simulate_step(target, NULL)) != ERROR_OK)
1471 return retval;
1472 current_pc = buf_get_u32(armv4_5->pc->value, 0, 32);
1473 LOG_DEBUG("current pc %" PRIx32, current_pc);
1474
1475 target->debug_reason = DBG_REASON_SINGLESTEP;
1476 target_call_event_callbacks(target, TARGET_EVENT_HALTED);
1477
1478 return ERROR_OK;
1479 }
1480
1481 /* the front-end may request us not to handle breakpoints */
1482 if (handle_breakpoints)
1483 breakpoint = breakpoint_find(target,
1484 buf_get_u32(armv4_5->pc->value, 0, 32));
1485 if (breakpoint != NULL) {
1486 retval = xscale_unset_breakpoint(target, breakpoint);
1487 if (retval != ERROR_OK)
1488 return retval;
1489 }
1490
1491 retval = xscale_step_inner(target, current, address, handle_breakpoints);
1492 if (retval != ERROR_OK)
1493 return retval;
1494
1495 if (breakpoint)
1496 {
1497 xscale_set_breakpoint(target, breakpoint);
1498 }
1499
1500 LOG_DEBUG("target stepped");
1501
1502 return ERROR_OK;
1503
1504 }
1505
1506 static int xscale_assert_reset(struct target *target)
1507 {
1508 struct xscale_common *xscale = target_to_xscale(target);
1509
1510 LOG_DEBUG("target->state: %s",
1511 target_state_name(target));
1512
1513 /* select DCSR instruction (set endstate to R-T-I to ensure we don't
1514 * end up in T-L-R, which would reset JTAG
1515 */
1516 xscale_jtag_set_instr(target->tap,
1517 XSCALE_SELDCSR << xscale->xscale_variant,
1518 TAP_IDLE);
1519
1520 /* set Hold reset, Halt mode and Trap Reset */
1521 buf_set_u32(xscale->reg_cache->reg_list[XSCALE_DCSR].value, 30, 1, 0x1);
1522 buf_set_u32(xscale->reg_cache->reg_list[XSCALE_DCSR].value, 16, 1, 0x1);
1523 xscale_write_dcsr(target, 1, 0);
1524
1525 /* select BYPASS, because having DCSR selected caused problems on the PXA27x */
1526 xscale_jtag_set_instr(target->tap, ~0, TAP_IDLE);
1527 jtag_execute_queue();
1528
1529 /* assert reset */
1530 jtag_add_reset(0, 1);
1531
1532 /* sleep 1ms, to be sure we fulfill any requirements */
1533 jtag_add_sleep(1000);
1534 jtag_execute_queue();
1535
1536 target->state = TARGET_RESET;
1537
1538 if (target->reset_halt)
1539 {
1540 int retval;
1541 if ((retval = target_halt(target)) != ERROR_OK)
1542 return retval;
1543 }
1544
1545 return ERROR_OK;
1546 }
1547
1548 static int xscale_deassert_reset(struct target *target)
1549 {
1550 struct xscale_common *xscale = target_to_xscale(target);
1551 struct breakpoint *breakpoint = target->breakpoints;
1552
1553 LOG_DEBUG("-");
1554
1555 xscale->ibcr_available = 2;
1556 xscale->ibcr0_used = 0;
1557 xscale->ibcr1_used = 0;
1558
1559 xscale->dbr_available = 2;
1560 xscale->dbr0_used = 0;
1561 xscale->dbr1_used = 0;
1562
1563 /* mark all hardware breakpoints as unset */
1564 while (breakpoint)
1565 {
1566 if (breakpoint->type == BKPT_HARD)
1567 {
1568 breakpoint->set = 0;
1569 }
1570 breakpoint = breakpoint->next;
1571 }
1572
1573 xscale->trace.mode = XSCALE_TRACE_DISABLED;
1574 xscale_free_trace_data(xscale);
1575
1576 register_cache_invalidate(xscale->armv4_5_common.core_cache);
1577
1578 /* FIXME mark hardware watchpoints got unset too. Also,
1579 * at least some of the XScale registers are invalid...
1580 */
1581
1582 /*
1583 * REVISIT: *assumes* we had a SRST+TRST reset so the mini-icache
1584 * contents got invalidated. Safer to force that, so writing new
1585 * contents can't ever fail..
1586 */
1587 {
1588 uint32_t address;
1589 unsigned buf_cnt;
1590 const uint8_t *buffer = xscale_debug_handler;
1591 int retval;
1592
1593 /* release SRST */
1594 jtag_add_reset(0, 0);
1595
1596 /* wait 300ms; 150 and 100ms were not enough */
1597 jtag_add_sleep(300*1000);
1598
1599 jtag_add_runtest(2030, TAP_IDLE);
1600 jtag_execute_queue();
1601
1602 /* set Hold reset, Halt mode and Trap Reset */
1603 buf_set_u32(xscale->reg_cache->reg_list[XSCALE_DCSR].value, 30, 1, 0x1);
1604 buf_set_u32(xscale->reg_cache->reg_list[XSCALE_DCSR].value, 16, 1, 0x1);
1605 xscale_write_dcsr(target, 1, 0);
1606
1607 /* Load the debug handler into the mini-icache. Since
1608 * it's using halt mode (not monitor mode), it runs in
1609 * "Special Debug State" for access to registers, memory,
1610 * coprocessors, trace data, etc.
1611 */
1612 address = xscale->handler_address;
1613 for (unsigned binary_size = sizeof xscale_debug_handler - 1;
1614 binary_size > 0;
1615 binary_size -= buf_cnt, buffer += buf_cnt)
1616 {
1617 uint32_t cache_line[8];
1618 unsigned i;
1619
1620 buf_cnt = binary_size;
1621 if (buf_cnt > 32)
1622 buf_cnt = 32;
1623
1624 for (i = 0; i < buf_cnt; i += 4)
1625 {
1626 /* convert LE buffer to host-endian uint32_t */
1627 cache_line[i / 4] = le_to_h_u32(&buffer[i]);
1628 }
1629
1630 for (; i < 32; i += 4)
1631 {
1632 cache_line[i / 4] = 0xe1a08008;
1633 }
1634
1635 /* only load addresses other than the reset vectors */
1636 if ((address % 0x400) != 0x0)
1637 {
1638 retval = xscale_load_ic(target, address,
1639 cache_line);
1640 if (retval != ERROR_OK)
1641 return retval;
1642 }
1643
1644 address += buf_cnt;
1645 };
1646
1647 retval = xscale_load_ic(target, 0x0,
1648 xscale->low_vectors);
1649 if (retval != ERROR_OK)
1650 return retval;
1651 retval = xscale_load_ic(target, 0xffff0000,
1652 xscale->high_vectors);
1653 if (retval != ERROR_OK)
1654 return retval;
1655
1656 jtag_add_runtest(30, TAP_IDLE);
1657
1658 jtag_add_sleep(100000);
1659
1660 /* set Hold reset, Halt mode and Trap Reset */
1661 buf_set_u32(xscale->reg_cache->reg_list[XSCALE_DCSR].value, 30, 1, 0x1);
1662 buf_set_u32(xscale->reg_cache->reg_list[XSCALE_DCSR].value, 16, 1, 0x1);
1663 xscale_write_dcsr(target, 1, 0);
1664
1665 /* clear Hold reset to let the target run (should enter debug handler) */
1666 xscale_write_dcsr(target, 0, 1);
1667 target->state = TARGET_RUNNING;
1668
1669 if (!target->reset_halt)
1670 {
1671 jtag_add_sleep(10000);
1672
1673 /* we should have entered debug now */
1674 xscale_debug_entry(target);
1675 target->state = TARGET_HALTED;
1676
1677 /* resume the target */
1678 xscale_resume(target, 1, 0x0, 1, 0);
1679 }
1680 }
1681
1682 return ERROR_OK;
1683 }
1684
1685 static int xscale_read_core_reg(struct target *target, struct reg *r,
1686 int num, enum arm_mode mode)
1687 {
1688 /** \todo add debug handler support for core register reads */
1689 LOG_ERROR("not implemented");
1690 return ERROR_OK;
1691 }
1692
1693 static int xscale_write_core_reg(struct target *target, struct reg *r,
1694 int num, enum arm_mode mode, uint32_t value)
1695 {
1696 /** \todo add debug handler support for core register writes */
1697 LOG_ERROR("not implemented");
1698 return ERROR_OK;
1699 }
1700
1701 static int xscale_full_context(struct target *target)
1702 {
1703 struct arm *armv4_5 = target_to_arm(target);
1704
1705 uint32_t *buffer;
1706
1707 int i, j;
1708
1709 LOG_DEBUG("-");
1710
1711 if (target->state != TARGET_HALTED)
1712 {
1713 LOG_WARNING("target not halted");
1714 return ERROR_TARGET_NOT_HALTED;
1715 }
1716
1717 buffer = malloc(4 * 8);
1718
1719 /* iterate through processor modes (FIQ, IRQ, SVC, ABT, UND and SYS)
1720 * we can't enter User mode on an XScale (unpredictable),
1721 * but User shares registers with SYS
1722 */
1723 for (i = 1; i < 7; i++)
1724 {
1725 enum arm_mode mode = armv4_5_number_to_mode(i);
1726 bool valid = true;
1727 struct reg *r;
1728
1729 if (mode == ARM_MODE_USR)
1730 continue;
1731
1732 /* check if there are invalid registers in the current mode
1733 */
1734 for (j = 0; valid && j <= 16; j++)
1735 {
1736 if (!ARMV4_5_CORE_REG_MODE(armv4_5->core_cache,
1737 mode, j).valid)
1738 valid = false;
1739 }
1740 if (valid)
1741 continue;
1742
1743 /* request banked registers */
1744 xscale_send_u32(target, 0x0);
1745
1746 /* send CPSR for desired bank mode */
1747 xscale_send_u32(target, mode | 0xc0 /* I/F bits */);
1748
1749 /* get banked registers: r8 to r14; and SPSR
1750 * except in USR/SYS mode
1751 */
1752 if (mode != ARM_MODE_SYS) {
1753 /* SPSR */
1754 r = &ARMV4_5_CORE_REG_MODE(armv4_5->core_cache,
1755 mode, 16);
1756
1757 xscale_receive(target, buffer, 8);
1758
1759 buf_set_u32(r->value, 0, 32, buffer[7]);
1760 r->dirty = false;
1761 r->valid = true;
1762 } else {
1763 xscale_receive(target, buffer, 7);
1764 }
1765
1766 /* move data from buffer to register cache */
1767 for (j = 8; j <= 14; j++)
1768 {
1769 r = &ARMV4_5_CORE_REG_MODE(armv4_5->core_cache,
1770 mode, j);
1771
1772 buf_set_u32(r->value, 0, 32, buffer[j - 8]);
1773 r->dirty = false;
1774 r->valid = true;
1775 }
1776 }
1777
1778 free(buffer);
1779
1780 return ERROR_OK;
1781 }
1782
1783 static int xscale_restore_banked(struct target *target)
1784 {
1785 struct arm *armv4_5 = target_to_arm(target);
1786
1787 int i, j;
1788
1789 if (target->state != TARGET_HALTED)
1790 {
1791 LOG_WARNING("target not halted");
1792 return ERROR_TARGET_NOT_HALTED;
1793 }
1794
1795 /* iterate through processor modes (FIQ, IRQ, SVC, ABT, UND and SYS)
1796 * and check if any banked registers need to be written. Ignore
1797 * USR mode (number 0) in favor of SYS; we can't enter User mode on
1798 * an XScale (unpredictable), but they share all registers.
1799 */
1800 for (i = 1; i < 7; i++)
1801 {
1802 enum arm_mode mode = armv4_5_number_to_mode(i);
1803 struct reg *r;
1804
1805 if (mode == ARM_MODE_USR)
1806 continue;
1807
1808 /* check if there are dirty registers in this mode */
1809 for (j = 8; j <= 14; j++)
1810 {
1811 if (ARMV4_5_CORE_REG_MODE(armv4_5->core_cache,
1812 mode, j).dirty)
1813 goto dirty;
1814 }
1815
1816 /* if not USR/SYS, check if the SPSR needs to be written */
1817 if (mode != ARM_MODE_SYS)
1818 {
1819 if (ARMV4_5_CORE_REG_MODE(armv4_5->core_cache,
1820 mode, 16).dirty)
1821 goto dirty;
1822 }
1823
1824 /* there's nothing to flush for this mode */
1825 continue;
1826
1827 dirty:
1828 /* command 0x1: "send banked registers" */
1829 xscale_send_u32(target, 0x1);
1830
1831 /* send CPSR for desired mode */
1832 xscale_send_u32(target, mode | 0xc0 /* I/F bits */);
1833
1834 /* send r8 to r14/lr ... only FIQ needs more than r13..r14,
1835 * but this protocol doesn't understand that nuance.
1836 */
1837 for (j = 8; j <= 14; j++) {
1838 r = &ARMV4_5_CORE_REG_MODE(armv4_5->core_cache,
1839 mode, j);
1840 xscale_send_u32(target, buf_get_u32(r->value, 0, 32));
1841 r->dirty = false;
1842 }
1843
1844 /* send spsr if not in USR/SYS mode */
1845 if (mode != ARM_MODE_SYS) {
1846 r = &ARMV4_5_CORE_REG_MODE(armv4_5->core_cache,
1847 mode, 16);
1848 xscale_send_u32(target, buf_get_u32(r->value, 0, 32));
1849 r->dirty = false;
1850 }
1851 }
1852
1853 return ERROR_OK;
1854 }
1855
1856 static int xscale_read_memory(struct target *target, uint32_t address,
1857 uint32_t size, uint32_t count, uint8_t *buffer)
1858 {
1859 struct xscale_common *xscale = target_to_xscale(target);
1860 uint32_t *buf32;
1861 uint32_t i;
1862 int retval;
1863
1864 LOG_DEBUG("address: 0x%8.8" PRIx32 ", size: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32, address, size, count);
1865
1866 if (target->state != TARGET_HALTED)
1867 {
1868 LOG_WARNING("target not halted");
1869 return ERROR_TARGET_NOT_HALTED;
1870 }
1871
1872 /* sanitize arguments */
1873 if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
1874 return ERROR_COMMAND_SYNTAX_ERROR;
1875
1876 if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
1877 return ERROR_TARGET_UNALIGNED_ACCESS;
1878
1879 /* send memory read request (command 0x1n, n: access size) */
1880 if ((retval = xscale_send_u32(target, 0x10 | size)) != ERROR_OK)
1881 return retval;
1882
1883 /* send base address for read request */
1884 if ((retval = xscale_send_u32(target, address)) != ERROR_OK)
1885 return retval;
1886
1887 /* send number of requested data words */
1888 if ((retval = xscale_send_u32(target, count)) != ERROR_OK)
1889 return retval;
1890
1891 /* receive data from target (count times 32-bit words in host endianness) */
1892 buf32 = malloc(4 * count);
1893 if ((retval = xscale_receive(target, buf32, count)) != ERROR_OK)
1894 return retval;
1895
1896 /* extract data from host-endian buffer into byte stream */
1897 for (i = 0; i < count; i++)
1898 {
1899 switch (size)
1900 {
1901 case 4:
1902 target_buffer_set_u32(target, buffer, buf32[i]);
1903 buffer += 4;
1904 break;
1905 case 2:
1906 target_buffer_set_u16(target, buffer, buf32[i] & 0xffff);
1907 buffer += 2;
1908 break;
1909 case 1:
1910 *buffer++ = buf32[i] & 0xff;
1911 break;
1912 default:
1913 LOG_ERROR("invalid read size");
1914 return ERROR_COMMAND_SYNTAX_ERROR;
1915 }
1916 }
1917
1918 free(buf32);
1919
1920 /* examine DCSR, to see if Sticky Abort (SA) got set */
1921 if ((retval = xscale_read_dcsr(target)) != ERROR_OK)
1922 return retval;
1923 if (buf_get_u32(xscale->reg_cache->reg_list[XSCALE_DCSR].value, 5, 1) == 1)
1924 {
1925 /* clear SA bit */
1926 if ((retval = xscale_send_u32(target, 0x60)) != ERROR_OK)
1927 return retval;
1928
1929 return ERROR_TARGET_DATA_ABORT;
1930 }
1931
1932 return ERROR_OK;
1933 }
1934
1935 static int xscale_read_phys_memory(struct target *target, uint32_t address,
1936 uint32_t size, uint32_t count, uint8_t *buffer)
1937 {
1938 struct xscale_common *xscale = target_to_xscale(target);
1939
1940 /* with MMU inactive, there are only physical addresses */
1941 if (!xscale->armv4_5_mmu.mmu_enabled)
1942 return xscale_read_memory(target, address, size, count, buffer);
1943
1944 /** \todo: provide a non-stub implementation of this routine. */
1945 LOG_ERROR("%s: %s is not implemented. Disable MMU?",
1946 target_name(target), __func__);
1947 return ERROR_FAIL;
1948 }
1949
1950 static int xscale_write_memory(struct target *target, uint32_t address,
1951 uint32_t size, uint32_t count, const uint8_t *buffer)
1952 {
1953 struct xscale_common *xscale = target_to_xscale(target);
1954 int retval;
1955
1956 LOG_DEBUG("address: 0x%8.8" PRIx32 ", size: 0x%8.8" PRIx32 ", count: 0x%8.8" PRIx32, address, size, count);
1957
1958 if (target->state != TARGET_HALTED)
1959 {
1960 LOG_WARNING("target not halted");
1961 return ERROR_TARGET_NOT_HALTED;
1962 }
1963
1964 /* sanitize arguments */
1965 if (((size != 4) && (size != 2) && (size != 1)) || (count == 0) || !(buffer))
1966 return ERROR_COMMAND_SYNTAX_ERROR;
1967
1968 if (((size == 4) && (address & 0x3u)) || ((size == 2) && (address & 0x1u)))
1969 return ERROR_TARGET_UNALIGNED_ACCESS;
1970
1971 /* send memory write request (command 0x2n, n: access size) */
1972 if ((retval = xscale_send_u32(target, 0x20 | size)) != ERROR_OK)
1973 return retval;
1974
1975 /* send base address for read request */
1976 if ((retval = xscale_send_u32(target, address)) != ERROR_OK)
1977 return retval;
1978
1979 /* send number of requested data words to be written*/
1980 if ((retval = xscale_send_u32(target, count)) != ERROR_OK)
1981 return retval;
1982
1983 /* extract data from host-endian buffer into byte stream */
1984 #if 0
1985 for (i = 0; i < count; i++)
1986 {
1987 switch (size)
1988 {
1989 case 4:
1990 value = target_buffer_get_u32(target, buffer);
1991 xscale_send_u32(target, value);
1992 buffer += 4;
1993 break;
1994 case 2:
1995 value = target_buffer_get_u16(target, buffer);
1996 xscale_send_u32(target, value);
1997 buffer += 2;
1998 break;
1999 case 1:
2000 value = *buffer;
2001 xscale_send_u32(target, value);
2002 buffer += 1;
2003 break;
2004 default:
2005 LOG_ERROR("should never get here");
2006 exit(-1);
2007 }
2008 }
2009 #endif
2010 if ((retval = xscale_send(target, buffer, count, size)) != ERROR_OK)
2011 return retval;
2012
2013 /* examine DCSR, to see if Sticky Abort (SA) got set */
2014 if ((retval = xscale_read_dcsr(target)) != ERROR_OK)
2015 return retval;
2016 if (buf_get_u32(xscale->reg_cache->reg_list[XSCALE_DCSR].value, 5, 1) == 1)
2017 {
2018 /* clear SA bit */
2019 if ((retval = xscale_send_u32(target, 0x60)) != ERROR_OK)
2020 return retval;
2021
2022 LOG_ERROR("data abort writing memory");
2023 return ERROR_TARGET_DATA_ABORT;
2024 }
2025
2026 return ERROR_OK;
2027 }
2028
2029 static int xscale_write_phys_memory(struct target *target, uint32_t address,
2030 uint32_t size, uint32_t count, const uint8_t *buffer)
2031 {
2032 struct xscale_common *xscale = target_to_xscale(target);
2033
2034 /* with MMU inactive, there are only physical addresses */
2035 if (!xscale->armv4_5_mmu.mmu_enabled)
2036 return xscale_write_memory(target, address, size, count, buffer);
2037
2038 /** \todo: provide a non-stub implementation of this routine. */
2039 LOG_ERROR("%s: %s is not implemented. Disable MMU?",
2040 target_name(target), __func__);
2041 return ERROR_FAIL;
2042 }
2043
2044 static int xscale_bulk_write_memory(struct target *target, uint32_t address,
2045 uint32_t count, const uint8_t *buffer)
2046 {
2047 return xscale_write_memory(target, address, 4, count, buffer);
2048 }
2049
2050 static int xscale_get_ttb(struct target *target, uint32_t *result)
2051 {
2052 struct xscale_common *xscale = target_to_xscale(target);
2053 uint32_t ttb;
2054 int retval;
2055
2056 retval = xscale_get_reg(&xscale->reg_cache->reg_list[XSCALE_TTB]);
2057 if (retval != ERROR_OK)
2058 return retval;
2059 ttb = buf_get_u32(xscale->reg_cache->reg_list[XSCALE_TTB].value, 0, 32);
2060
2061 *result = ttb;
2062
2063 return ERROR_OK;
2064 }
2065
2066 static int xscale_disable_mmu_caches(struct target *target, int mmu,
2067 int d_u_cache, int i_cache)
2068 {
2069 struct xscale_common *xscale = target_to_xscale(target);
2070 uint32_t cp15_control;
2071 int retval;
2072
2073 /* read cp15 control register */
2074 retval = xscale_get_reg(&xscale->reg_cache->reg_list[XSCALE_CTRL]);
2075 if (retval !=ERROR_OK)
2076 return retval;
2077 cp15_control = buf_get_u32(xscale->reg_cache->reg_list[XSCALE_CTRL].value, 0, 32);
2078
2079 if (mmu)
2080 cp15_control &= ~0x1U;
2081
2082 if (d_u_cache)
2083 {
2084 /* clean DCache */
2085 retval = xscale_send_u32(target, 0x50);
2086 if (retval !=ERROR_OK)
2087 return retval;
2088 retval = xscale_send_u32(target, xscale->cache_clean_address);
2089 if (retval !=ERROR_OK)
2090 return retval;
2091
2092 /* invalidate DCache */
2093 retval = xscale_send_u32(target, 0x51);
2094 if (retval !=ERROR_OK)
2095 return retval;
2096
2097 cp15_control &= ~0x4U;
2098 }
2099
2100 if (i_cache)
2101 {
2102 /* invalidate ICache */
2103 retval = xscale_send_u32(target, 0x52);
2104 if (retval !=ERROR_OK)
2105 return retval;
2106 cp15_control &= ~0x1000U;
2107 }
2108
2109 /* write new cp15 control register */
2110 retval = xscale_set_reg_u32(&xscale->reg_cache->reg_list[XSCALE_CTRL], cp15_control);
2111 if (retval !=ERROR_OK)
2112 return retval;
2113
2114 /* execute cpwait to ensure outstanding operations complete */
2115 retval = xscale_send_u32(target, 0x53);
2116 return retval;
2117 }
2118
2119 static int xscale_enable_mmu_caches(struct target *target, int mmu,
2120 int d_u_cache, int i_cache)
2121 {
2122 struct xscale_common *xscale = target_to_xscale(target);
2123 uint32_t cp15_control;
2124 int retval;
2125
2126 /* read cp15 control register */
2127 retval = xscale_get_reg(&xscale->reg_cache->reg_list[XSCALE_CTRL]);
2128 if (retval !=ERROR_OK)
2129 return retval;
2130 cp15_control = buf_get_u32(xscale->reg_cache->reg_list[XSCALE_CTRL].value, 0, 32);
2131
2132 if (mmu)
2133 cp15_control |= 0x1U;
2134
2135 if (d_u_cache)
2136 cp15_control |= 0x4U;
2137
2138 if (i_cache)
2139 cp15_control |= 0x1000U;
2140
2141 /* write new cp15 control register */
2142 retval = xscale_set_reg_u32(&xscale->reg_cache->reg_list[XSCALE_CTRL], cp15_control);
2143 if (retval !=ERROR_OK)
2144 return retval;
2145
2146 /* execute cpwait to ensure outstanding operations complete */
2147 retval = xscale_send_u32(target, 0x53);
2148 return retval;
2149 }
2150
2151 static int xscale_set_breakpoint(struct target *target,
2152 struct breakpoint *breakpoint)
2153 {
2154 int retval;
2155 struct xscale_common *xscale = target_to_xscale(target);
2156
2157 if (target->state != TARGET_HALTED)
2158 {
2159 LOG_WARNING("target not halted");
2160 return ERROR_TARGET_NOT_HALTED;
2161 }
2162
2163 if (breakpoint->set)
2164 {
2165 LOG_WARNING("breakpoint already set");
2166 return ERROR_OK;
2167 }
2168
2169 if (breakpoint->type == BKPT_HARD)
2170 {
2171 uint32_t value = breakpoint->address | 1;
2172 if (!xscale->ibcr0_used)
2173 {
2174 xscale_set_reg_u32(&xscale->reg_cache->reg_list[XSCALE_IBCR0], value);
2175 xscale->ibcr0_used = 1;
2176 breakpoint->set = 1; /* breakpoint set on first breakpoint register */
2177 }
2178 else if (!xscale->ibcr1_used)
2179 {
2180 xscale_set_reg_u32(&xscale->reg_cache->reg_list[XSCALE_IBCR1], value);
2181 xscale->ibcr1_used = 1;
2182 breakpoint->set = 2; /* breakpoint set on second breakpoint register */
2183 }
2184 else
2185 { /* bug: availability previously verified in xscale_add_breakpoint() */
2186 LOG_ERROR("BUG: no hardware comparator available");
2187 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
2188 }
2189 }
2190 else if (breakpoint->type == BKPT_SOFT)
2191 {
2192 if (breakpoint->length == 4)
2193 {
2194 /* keep the original instruction in target endianness */
2195 if ((retval = target_read_memory(target, breakpoint->address, 4, 1, breakpoint->orig_instr)) != ERROR_OK)
2196 {
2197 return retval;
2198 }
2199 /* write the bkpt instruction in target endianness (arm7_9->arm_bkpt is host endian) */
2200 if ((retval = target_write_u32(target, breakpoint->address, xscale->arm_bkpt)) != ERROR_OK)
2201 {
2202 return retval;
2203 }
2204 }
2205 else
2206 {
2207 /* keep the original instruction in target endianness */
2208 if ((retval = target_read_memory(target, breakpoint->address, 2, 1, breakpoint->orig_instr)) != ERROR_OK)
2209 {
2210 return retval;
2211 }
2212 /* write the bkpt instruction in target endianness (arm7_9->arm_bkpt is host endian) */
2213 if ((retval = target_write_u16(target, breakpoint->address, xscale->thumb_bkpt)) != ERROR_OK)
2214 {
2215 return retval;
2216 }
2217 }
2218 breakpoint->set = 1;
2219
2220 xscale_send_u32(target, 0x50); /* clean dcache */
2221 xscale_send_u32(target, xscale->cache_clean_address);
2222 xscale_send_u32(target, 0x51); /* invalidate dcache */
2223 xscale_send_u32(target, 0x52); /* invalidate icache and flush fetch buffers */
2224 }
2225
2226 return ERROR_OK;
2227 }
2228
2229 static int xscale_add_breakpoint(struct target *target,
2230 struct breakpoint *breakpoint)
2231 {
2232 struct xscale_common *xscale = target_to_xscale(target);
2233
2234 if ((breakpoint->type == BKPT_HARD) && (xscale->ibcr_available < 1))
2235 {
2236 LOG_ERROR("no breakpoint unit available for hardware breakpoint");
2237 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
2238 }
2239
2240 if ((breakpoint->length != 2) && (breakpoint->length != 4))
2241 {
2242 LOG_ERROR("only breakpoints of two (Thumb) or four (ARM) bytes length supported");
2243 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
2244 }
2245
2246 if (breakpoint->type == BKPT_HARD)
2247 {
2248 xscale->ibcr_available--;
2249 }
2250
2251 return xscale_set_breakpoint(target, breakpoint);
2252 }
2253
2254 static int xscale_unset_breakpoint(struct target *target,
2255 struct breakpoint *breakpoint)
2256 {
2257 int retval;
2258 struct xscale_common *xscale = target_to_xscale(target);
2259
2260 if (target->state != TARGET_HALTED)
2261 {
2262 LOG_WARNING("target not halted");
2263 return ERROR_TARGET_NOT_HALTED;
2264 }
2265
2266 if (!breakpoint->set)
2267 {
2268 LOG_WARNING("breakpoint not set");
2269 return ERROR_OK;
2270 }
2271
2272 if (breakpoint->type == BKPT_HARD)
2273 {
2274 if (breakpoint->set == 1)
2275 {
2276 xscale_set_reg_u32(&xscale->reg_cache->reg_list[XSCALE_IBCR0], 0x0);
2277 xscale->ibcr0_used = 0;
2278 }
2279 else if (breakpoint->set == 2)
2280 {
2281 xscale_set_reg_u32(&xscale->reg_cache->reg_list[XSCALE_IBCR1], 0x0);
2282 xscale->ibcr1_used = 0;
2283 }
2284 breakpoint->set = 0;
2285 }
2286 else
2287 {
2288 /* restore original instruction (kept in target endianness) */
2289 if (breakpoint->length == 4)
2290 {
2291 if ((retval = target_write_memory(target, breakpoint->address, 4, 1, breakpoint->orig_instr)) != ERROR_OK)
2292 {
2293 return retval;
2294 }
2295 }
2296 else
2297 {
2298 if ((retval = target_write_memory(target, breakpoint->address, 2, 1, breakpoint->orig_instr)) != ERROR_OK)
2299 {
2300 return retval;
2301 }
2302 }
2303 breakpoint->set = 0;
2304
2305 xscale_send_u32(target, 0x50); /* clean dcache */
2306 xscale_send_u32(target, xscale->cache_clean_address);
2307 xscale_send_u32(target, 0x51); /* invalidate dcache */
2308 xscale_send_u32(target, 0x52); /* invalidate icache and flush fetch buffers */
2309 }
2310
2311 return ERROR_OK;
2312 }
2313
2314 static int xscale_remove_breakpoint(struct target *target, struct breakpoint *breakpoint)
2315 {
2316 struct xscale_common *xscale = target_to_xscale(target);
2317
2318 if (target->state != TARGET_HALTED)
2319 {
2320 LOG_ERROR("target not halted");
2321 return ERROR_TARGET_NOT_HALTED;
2322 }
2323
2324 if (breakpoint->set)
2325 {
2326 xscale_unset_breakpoint(target, breakpoint);
2327 }
2328
2329 if (breakpoint->type == BKPT_HARD)
2330 xscale->ibcr_available++;
2331
2332 return ERROR_OK;
2333 }
2334
2335 static int xscale_set_watchpoint(struct target *target,
2336 struct watchpoint *watchpoint)
2337 {
2338 struct xscale_common *xscale = target_to_xscale(target);
2339 uint32_t enable = 0;
2340 struct reg *dbcon = &xscale->reg_cache->reg_list[XSCALE_DBCON];
2341 uint32_t dbcon_value = buf_get_u32(dbcon->value, 0, 32);
2342
2343 if (target->state != TARGET_HALTED)
2344 {
2345 LOG_ERROR("target not halted");
2346 return ERROR_TARGET_NOT_HALTED;
2347 }
2348
2349 switch (watchpoint->rw)
2350 {
2351 case WPT_READ:
2352 enable = 0x3;
2353 break;
2354 case WPT_ACCESS:
2355 enable = 0x2;
2356 break;
2357 case WPT_WRITE:
2358 enable = 0x1;
2359 break;
2360 default:
2361 LOG_ERROR("BUG: watchpoint->rw neither read, write nor access");
2362 }
2363
2364 /* For watchpoint across more than one word, both DBR registers must
2365 be enlisted, with the second used as a mask. */
2366 if (watchpoint->length > 4)
2367 {
2368 if (xscale->dbr0_used || xscale->dbr1_used)
2369 {
2370 LOG_ERROR("BUG: sufficient hardware comparators unavailable");
2371 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
2372 }
2373
2374 /* Write mask value to DBR1, based on the length argument.
2375 * Address bits ignored by the comparator are those set in mask. */
2376 xscale_set_reg_u32(&xscale->reg_cache->reg_list[XSCALE_DBR1],
2377 watchpoint->length - 1);
2378 xscale->dbr1_used = 1;
2379 enable |= 0x100; /* DBCON[M] */
2380 }
2381
2382 if (!xscale->dbr0_used)
2383 {
2384 xscale_set_reg_u32(&xscale->reg_cache->reg_list[XSCALE_DBR0], watchpoint->address);
2385 dbcon_value |= enable;
2386 xscale_set_reg_u32(dbcon, dbcon_value);
2387 watchpoint->set = 1;
2388 xscale->dbr0_used = 1;
2389 }
2390 else if (!xscale->dbr1_used)
2391 {
2392 xscale_set_reg_u32(&xscale->reg_cache->reg_list[XSCALE_DBR1], watchpoint->address);
2393 dbcon_value |= enable << 2;
2394 xscale_set_reg_u32(dbcon, dbcon_value);
2395 watchpoint->set = 2;
2396 xscale->dbr1_used = 1;
2397 }
2398 else
2399 {
2400 LOG_ERROR("BUG: no hardware comparator available");
2401 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
2402 }
2403
2404 return ERROR_OK;
2405 }
2406
2407 static int xscale_add_watchpoint(struct target *target,
2408 struct watchpoint *watchpoint)
2409 {
2410 struct xscale_common *xscale = target_to_xscale(target);
2411
2412 if (xscale->dbr_available < 1)
2413 {
2414 LOG_ERROR("no more watchpoint registers available");
2415 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
2416 }
2417
2418 if (watchpoint->value)
2419 LOG_WARNING("xscale does not support value, mask arguments; ignoring");
2420
2421 /* check that length is a power of two */
2422 for (uint32_t len = watchpoint->length; len != 1; len /= 2)
2423 {
2424 if (len % 2)
2425 {
2426 LOG_ERROR("xscale requires that watchpoint length is a power of two");
2427 return ERROR_COMMAND_ARGUMENT_INVALID;
2428 }
2429 }
2430
2431 if (watchpoint->length == 4) /* single word watchpoint */
2432 {
2433 xscale->dbr_available--; /* one DBR reg used */
2434 return ERROR_OK;
2435 }
2436
2437 /* watchpoints across multiple words require both DBR registers */
2438 if (xscale->dbr_available < 2)
2439 {
2440 LOG_ERROR("insufficient watchpoint registers available");
2441 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
2442 }
2443
2444 if (watchpoint->length > watchpoint->address)
2445 {
2446 LOG_ERROR("xscale does not support watchpoints with length "
2447 "greater than address");
2448 return ERROR_COMMAND_ARGUMENT_INVALID;
2449 }
2450
2451 xscale->dbr_available = 0;
2452 return ERROR_OK;
2453 }
2454
2455 static int xscale_unset_watchpoint(struct target *target,
2456 struct watchpoint *watchpoint)
2457 {
2458 struct xscale_common *xscale = target_to_xscale(target);
2459 struct reg *dbcon = &xscale->reg_cache->reg_list[XSCALE_DBCON];
2460 uint32_t dbcon_value = buf_get_u32(dbcon->value, 0, 32);
2461
2462 if (target->state != TARGET_HALTED)
2463 {
2464 LOG_WARNING("target not halted");
2465 return ERROR_TARGET_NOT_HALTED;
2466 }
2467
2468 if (!watchpoint->set)
2469 {
2470 LOG_WARNING("breakpoint not set");
2471 return ERROR_OK;
2472 }
2473
2474 if (watchpoint->set == 1)
2475 {
2476 if (watchpoint->length > 4)
2477 {
2478 dbcon_value &= ~0x103; /* clear DBCON[M] as well */
2479 xscale->dbr1_used = 0; /* DBR1 was used for mask */
2480 }
2481 else
2482 dbcon_value &= ~0x3;
2483
2484 xscale_set_reg_u32(dbcon, dbcon_value);
2485 xscale->dbr0_used = 0;
2486 }
2487 else if (watchpoint->set == 2)
2488 {
2489 dbcon_value &= ~0xc;
2490 xscale_set_reg_u32(dbcon, dbcon_value);
2491 xscale->dbr1_used = 0;
2492 }
2493 watchpoint->set = 0;
2494
2495 return ERROR_OK;
2496 }
2497
2498 static int xscale_remove_watchpoint(struct target *target, struct watchpoint *watchpoint)
2499 {
2500 struct xscale_common *xscale = target_to_xscale(target);
2501
2502 if (target->state != TARGET_HALTED)
2503 {
2504 LOG_ERROR("target not halted");
2505 return ERROR_TARGET_NOT_HALTED;
2506 }
2507
2508 if (watchpoint->set)
2509 {
2510 xscale_unset_watchpoint(target, watchpoint);
2511 }
2512
2513 if (watchpoint->length > 4)
2514 xscale->dbr_available++; /* both DBR regs now available */
2515
2516 xscale->dbr_available++;
2517
2518 return ERROR_OK;
2519 }
2520
2521 static int xscale_get_reg(struct reg *reg)
2522 {
2523 struct xscale_reg *arch_info = reg->arch_info;
2524 struct target *target = arch_info->target;
2525 struct xscale_common *xscale = target_to_xscale(target);
2526
2527 /* DCSR, TX and RX are accessible via JTAG */
2528 if (strcmp(reg->name, "XSCALE_DCSR") == 0)
2529 {
2530 return xscale_read_dcsr(arch_info->target);
2531 }
2532 else if (strcmp(reg->name, "XSCALE_TX") == 0)
2533 {
2534 /* 1 = consume register content */
2535 return xscale_read_tx(arch_info->target, 1);
2536 }
2537 else if (strcmp(reg->name, "XSCALE_RX") == 0)
2538 {
2539 /* can't read from RX register (host -> debug handler) */
2540 return ERROR_OK;
2541 }
2542 else if (strcmp(reg->name, "XSCALE_TXRXCTRL") == 0)
2543 {
2544 /* can't (explicitly) read from TXRXCTRL register */
2545 return ERROR_OK;
2546 }
2547 else /* Other DBG registers have to be transfered by the debug handler */
2548 {
2549 /* send CP read request (command 0x40) */
2550 xscale_send_u32(target, 0x40);
2551
2552 /* send CP register number */
2553 xscale_send_u32(target, arch_info->dbg_handler_number);
2554
2555 /* read register value */
2556 xscale_read_tx(target, 1);
2557 buf_cpy(xscale->reg_cache->reg_list[XSCALE_TX].value, reg->value, 32);
2558
2559 reg->dirty = 0;
2560 reg->valid = 1;
2561 }
2562
2563 return ERROR_OK;
2564 }
2565
2566 static int xscale_set_reg(struct reg *reg, uint8_t* buf)
2567 {
2568 struct xscale_reg *arch_info = reg->arch_info;
2569 struct target *target = arch_info->target;
2570 struct xscale_common *xscale = target_to_xscale(target);
2571 uint32_t value = buf_get_u32(buf, 0, 32);
2572
2573 /* DCSR, TX and RX are accessible via JTAG */
2574 if (strcmp(reg->name, "XSCALE_DCSR") == 0)
2575 {
2576 buf_set_u32(xscale->reg_cache->reg_list[XSCALE_DCSR].value, 0, 32, value);
2577 return xscale_write_dcsr(arch_info->target, -1, -1);
2578 }
2579 else if (strcmp(reg->name, "XSCALE_RX") == 0)
2580 {
2581 buf_set_u32(xscale->reg_cache->reg_list[XSCALE_RX].value, 0, 32, value);
2582 return xscale_write_rx(arch_info->target);
2583 }
2584 else if (strcmp(reg->name, "XSCALE_TX") == 0)
2585 {
2586 /* can't write to TX register (debug-handler -> host) */
2587 return ERROR_OK;
2588 }
2589 else if (strcmp(reg->name, "XSCALE_TXRXCTRL") == 0)
2590 {
2591 /* can't (explicitly) write to TXRXCTRL register */
2592 return ERROR_OK;
2593 }
2594 else /* Other DBG registers have to be transfered by the debug handler */
2595 {
2596 /* send CP write request (command 0x41) */
2597 xscale_send_u32(target, 0x41);
2598
2599 /* send CP register number */
2600 xscale_send_u32(target, arch_info->dbg_handler_number);
2601
2602 /* send CP register value */
2603 xscale_send_u32(target, value);
2604 buf_set_u32(reg->value, 0, 32, value);
2605 }
2606
2607 return ERROR_OK;
2608 }
2609
2610 static int xscale_write_dcsr_sw(struct target *target, uint32_t value)
2611 {
2612 struct xscale_common *xscale = target_to_xscale(target);
2613 struct reg *dcsr = &xscale->reg_cache->reg_list[XSCALE_DCSR];
2614 struct xscale_reg *dcsr_arch_info = dcsr->arch_info;
2615
2616 /* send CP write request (command 0x41) */
2617 xscale_send_u32(target, 0x41);
2618
2619 /* send CP register number */
2620 xscale_send_u32(target, dcsr_arch_info->dbg_handler_number);
2621
2622 /* send CP register value */
2623 xscale_send_u32(target, value);
2624 buf_set_u32(dcsr->value, 0, 32, value);
2625
2626 return ERROR_OK;
2627 }
2628
2629 static int xscale_read_trace(struct target *target)
2630 {
2631 struct xscale_common *xscale = target_to_xscale(target);
2632 struct arm *armv4_5 = &xscale->armv4_5_common;
2633 struct xscale_trace_data **trace_data_p;
2634
2635 /* 258 words from debug handler
2636 * 256 trace buffer entries
2637 * 2 checkpoint addresses
2638 */
2639 uint32_t trace_buffer[258];
2640 int is_address[256];
2641 int i, j;
2642 unsigned int num_checkpoints = 0;
2643
2644 if (target->state != TARGET_HALTED)
2645 {
2646 LOG_WARNING("target must be stopped to read trace data");
2647 return ERROR_TARGET_NOT_HALTED;
2648 }
2649
2650 /* send read trace buffer command (command 0x61) */
2651 xscale_send_u32(target, 0x61);
2652
2653 /* receive trace buffer content */
2654 xscale_receive(target, trace_buffer, 258);
2655
2656 /* parse buffer backwards to identify address entries */
2657 for (i = 255; i >= 0; i--)
2658 {
2659 /* also count number of checkpointed entries */
2660 if ((trace_buffer[i] & 0xe0) == 0xc0)
2661 num_checkpoints++;
2662
2663 is_address[i] = 0;
2664 if (((trace_buffer[i] & 0xf0) == 0x90) ||
2665 ((trace_buffer[i] & 0xf0) == 0xd0))
2666 {
2667 if (i > 0)
2668 is_address[--i] = 1;
2669 if (i > 0)
2670 is_address[--i] = 1;
2671 if (i > 0)
2672 is_address[--i] = 1;
2673 if (i > 0)
2674 is_address[--i] = 1;
2675 }
2676 }
2677
2678
2679 /* search first non-zero entry that is not part of an address */
2680 for (j = 0; (j < 256) && (trace_buffer[j] == 0) && (!is_address[j]); j++)
2681 ;
2682
2683 if (j == 256)
2684 {
2685 LOG_DEBUG("no trace data collected");
2686 return ERROR_XSCALE_NO_TRACE_DATA;
2687 }
2688
2689 /* account for possible partial address at buffer start (wrap mode only) */
2690 if (is_address[0])
2691 { /* first entry is address; complete set of 4? */
2692 i = 1;
2693 while (i < 4)
2694 if (!is_address[i++])
2695 break;
2696 if (i < 4)
2697 j += i; /* partial address; can't use it */
2698 }
2699
2700 /* if first valid entry is indirect branch, can't use that either (no address) */
2701 if (((trace_buffer[j] & 0xf0) == 0x90) || ((trace_buffer[j] & 0xf0) == 0xd0))
2702 j++;
2703
2704 /* walk linked list to terminating entry */
2705 for (trace_data_p = &xscale->trace.data; *trace_data_p; trace_data_p = &(*trace_data_p)->next)
2706 ;
2707
2708 *trace_data_p = malloc(sizeof(struct xscale_trace_data));
2709 (*trace_data_p)->next = NULL;
2710 (*trace_data_p)->chkpt0 = trace_buffer[256];
2711 (*trace_data_p)->chkpt1 = trace_buffer[257];
2712 (*trace_data_p)->last_instruction =
2713 buf_get_u32(armv4_5->pc->value, 0, 32);
2714 (*trace_data_p)->entries = malloc(sizeof(struct xscale_trace_entry) * (256 - j));
2715 (*trace_data_p)->depth = 256 - j;
2716 (*trace_data_p)->num_checkpoints = num_checkpoints;
2717
2718 for (i = j; i < 256; i++)
2719 {
2720 (*trace_data_p)->entries[i - j].data = trace_buffer[i];
2721 if (is_address[i])
2722 (*trace_data_p)->entries[i - j].type = XSCALE_TRACE_ADDRESS;
2723 else
2724 (*trace_data_p)->entries[i - j].type = XSCALE_TRACE_MESSAGE;
2725 }
2726
2727 return ERROR_OK;
2728 }
2729
2730 static int xscale_read_instruction(struct target *target, uint32_t pc,
2731 struct arm_instruction *instruction)
2732 {
2733 struct xscale_common *const xscale = target_to_xscale(target);
2734 int i;
2735 int section = -1;
2736 size_t size_read;
2737 uint32_t opcode;
2738 int retval;
2739
2740 if (!xscale->trace.image)
2741 return ERROR_TRACE_IMAGE_UNAVAILABLE;
2742
2743 /* search for the section the current instruction belongs to */
2744 for (i = 0; i < xscale->trace.image->num_sections; i++)
2745 {
2746 if ((xscale->trace.image->sections[i].base_address <= pc) &&
2747 (xscale->trace.image->sections[i].base_address + xscale->trace.image->sections[i].size > pc))
2748 {
2749 section = i;
2750 break;
2751 }
2752 }
2753
2754 if (section == -1)
2755 {
2756 /* current instruction couldn't be found in the image */
2757 return ERROR_TRACE_INSTRUCTION_UNAVAILABLE;
2758 }
2759
2760 if (xscale->trace.core_state == ARM_STATE_ARM)
2761 {
2762 uint8_t buf[4];
2763 if ((retval = image_read_section(xscale->trace.image, section,
2764 pc - xscale->trace.image->sections[section].base_address,
2765 4, buf, &size_read)) != ERROR_OK)
2766 {
2767 LOG_ERROR("error while reading instruction");
2768 return ERROR_TRACE_INSTRUCTION_UNAVAILABLE;
2769 }
2770 opcode = target_buffer_get_u32(target, buf);
2771 arm_evaluate_opcode(opcode, pc, instruction);
2772 }
2773 else if (xscale->trace.core_state == ARM_STATE_THUMB)
2774 {
2775 uint8_t buf[2];
2776 if ((retval = image_read_section(xscale->trace.image, section,
2777 pc - xscale->trace.image->sections[section].base_address,
2778 2, buf, &size_read)) != ERROR_OK)
2779 {
2780 LOG_ERROR("error while reading instruction");
2781 return ERROR_TRACE_INSTRUCTION_UNAVAILABLE;
2782 }
2783 opcode = target_buffer_get_u16(target, buf);
2784 thumb_evaluate_opcode(opcode, pc, instruction);
2785 }
2786 else
2787 {
2788 LOG_ERROR("BUG: unknown core state encountered");
2789 exit(-1);
2790 }
2791
2792 return ERROR_OK;
2793 }
2794
2795 /* Extract address encoded into trace data.
2796 * Write result to address referenced by argument 'target', or 0 if incomplete. */
2797 static inline void xscale_branch_address(struct xscale_trace_data *trace_data,
2798 int i, uint32_t *target)
2799 {
2800 /* if there are less than four entries prior to the indirect branch message
2801 * we can't extract the address */
2802 if (i < 4)
2803 *target = 0;
2804 else
2805 *target = (trace_data->entries[i-1].data) | (trace_data->entries[i-2].data << 8) |
2806 (trace_data->entries[i-3].data << 16) | (trace_data->entries[i-4].data << 24);
2807 }
2808
2809 static inline void xscale_display_instruction(struct target *target, uint32_t pc,
2810 struct arm_instruction *instruction,
2811 struct command_context *cmd_ctx)
2812 {
2813 int retval = xscale_read_instruction(target, pc, instruction);
2814 if (retval == ERROR_OK)
2815 command_print(cmd_ctx, "%s", instruction->text);
2816 else
2817 command_print(cmd_ctx, "0x%8.8" PRIx32 "\t<not found in image>", pc);
2818 }
2819
2820 static int xscale_analyze_trace(struct target *target, struct command_context *cmd_ctx)
2821 {
2822 struct xscale_common *xscale = target_to_xscale(target);
2823 struct xscale_trace_data *trace_data = xscale->trace.data;
2824 int i, retval;
2825 uint32_t breakpoint_pc;
2826 struct arm_instruction instruction;
2827 uint32_t current_pc = 0; /* initialized when address determined */
2828
2829 if (!xscale->trace.image)
2830 LOG_WARNING("No trace image loaded; use 'xscale trace_image'");
2831
2832 /* loop for each trace buffer that was loaded from target */
2833 while (trace_data)
2834 {
2835 int chkpt = 0; /* incremented as checkpointed entries found */
2836 int j;
2837
2838 /* FIXME: set this to correct mode when trace buffer is first enabled */
2839 xscale->trace.core_state = ARM_STATE_ARM;
2840
2841 /* loop for each entry in this trace buffer */
2842 for (i = 0; i < trace_data->depth; i++)
2843 {
2844 int exception = 0;
2845 uint32_t chkpt_reg = 0x0;
2846 uint32_t branch_target = 0;
2847 int count;
2848
2849 /* trace entry type is upper nybble of 'message byte' */
2850 int trace_msg_type = (trace_data->entries[i].data & 0xf0) >> 4;
2851
2852 /* Target addresses of indirect branches are written into buffer
2853 * before the message byte representing the branch. Skip past it */
2854 if (trace_data->entries[i].type == XSCALE_TRACE_ADDRESS)
2855 continue;
2856
2857 switch (trace_msg_type)
2858 {
2859 case 0: /* Exceptions */
2860 case 1:
2861 case 2:
2862 case 3:
2863 case 4:
2864 case 5:
2865 case 6:
2866 case 7:
2867 exception = (trace_data->entries[i].data & 0x70) >> 4;
2868
2869 /* FIXME: vector table may be at ffff0000 */
2870 branch_target = (trace_data->entries[i].data & 0xf0) >> 2;
2871 break;
2872
2873 case 8: /* Direct Branch */
2874 break;
2875
2876 case 9: /* Indirect Branch */
2877 xscale_branch_address(trace_data, i, &branch_target);
2878 break;
2879
2880 case 13: /* Checkpointed Indirect Branch */
2881 xscale_branch_address(trace_data, i, &branch_target);
2882 if ((trace_data->num_checkpoints == 2) && (chkpt == 0))
2883 chkpt_reg = trace_data->chkpt1; /* 2 chkpts, this is oldest */
2884 else
2885 chkpt_reg = trace_data->chkpt0; /* 1 chkpt, or 2 and newest */
2886
2887 chkpt++;
2888 break;
2889
2890 case 12: /* Checkpointed Direct Branch */
2891 if ((trace_data->num_checkpoints == 2) && (chkpt == 0))
2892 chkpt_reg = trace_data->chkpt1; /* 2 chkpts, this is oldest */
2893 else
2894 chkpt_reg = trace_data->chkpt0; /* 1 chkpt, or 2 and newest */
2895
2896 /* if no current_pc, checkpoint will be starting point */
2897 if (current_pc == 0)
2898 branch_target = chkpt_reg;
2899
2900 chkpt++;
2901 break;
2902
2903 case 15: /* Roll-over */
2904 break;
2905
2906 default: /* Reserved */
2907 LOG_WARNING("trace is suspect: invalid trace message byte");
2908 continue;
2909
2910 }
2911
2912 /* If we don't have the current_pc yet, but we did get the branch target
2913 * (either from the trace buffer on indirect branch, or from a checkpoint reg),
2914 * then we can start displaying instructions at the next iteration, with
2915 * branch_target as the starting point.
2916 */
2917 if (current_pc == 0)
2918 {
2919 current_pc = branch_target; /* remains 0 unless branch_target obtained */
2920 continue;
2921 }
2922
2923 /* We have current_pc. Read and display the instructions from the image.
2924 * First, display count instructions (lower nybble of message byte). */
2925 count = trace_data->entries[i].data & 0x0f;
2926 for (j = 0; j < count; j++)
2927 {
2928 xscale_display_instruction(target, current_pc, &instruction, cmd_ctx);
2929 current_pc += xscale->trace.core_state == ARM_STATE_ARM ? 4 : 2;
2930 }
2931
2932 /* An additional instruction is implicitly added to count for
2933 * rollover and some exceptions: undef, swi, prefetch abort. */
2934 if ((trace_msg_type == 15) || (exception > 0 && exception < 4))
2935 {
2936 xscale_display_instruction(target, current_pc, &instruction, cmd_ctx);
2937 current_pc += xscale->trace.core_state == ARM_STATE_ARM ? 4 : 2;
2938 }
2939
2940 if (trace_msg_type == 15) /* rollover */
2941 continue;
2942
2943 if (exception)
2944 {
2945 command_print(cmd_ctx, "--- exception %i ---", exception);
2946 continue;
2947 }
2948
2949 /* not exception or rollover; next instruction is a branch and is
2950 * not included in the count */
2951 xscale_display_instruction(target, current_pc, &instruction, cmd_ctx);
2952
2953 /* for direct branches, extract branch destination from instruction */
2954 if ((trace_msg_type == 8) || (trace_msg_type == 12))
2955 {
2956 retval = xscale_read_instruction(target, current_pc, &instruction);
2957 if (retval == ERROR_OK)
2958 current_pc = instruction.info.b_bl_bx_blx.target_address;
2959 else
2960 current_pc = 0; /* branch destination unknown */
2961
2962 /* direct branch w/ checkpoint; can also get from checkpoint reg */
2963 if (trace_msg_type == 12)
2964 {
2965 if (current_pc == 0)
2966 current_pc = chkpt_reg;
2967 else if (current_pc != chkpt_reg) /* sanity check */
2968 LOG_WARNING("trace is suspect: checkpoint register "
2969 "inconsistent with adddress from image");
2970 }
2971
2972 if (current_pc == 0)
2973 command_print(cmd_ctx, "address unknown");
2974
2975 continue;
2976 }
2977
2978 /* indirect branch; the branch destination was read from trace buffer */
2979 if ((trace_msg_type == 9) || (trace_msg_type == 13))
2980 {
2981 current_pc = branch_target;
2982
2983 /* sanity check (checkpoint reg is redundant) */
2984 if ((trace_msg_type == 13) && (chkpt_reg != branch_target))
2985 LOG_WARNING("trace is suspect: checkpoint register "
2986 "inconsistent with address from trace buffer");
2987 }
2988
2989 } /* END: for (i = 0; i < trace_data->depth; i++) */
2990
2991 breakpoint_pc = trace_data->last_instruction; /* used below */
2992 trace_data = trace_data->next;
2993
2994 } /* END: while (trace_data) */
2995
2996 /* Finally... display all instructions up to the value of the pc when the
2997 * debug break occurred (saved when trace data was collected from target).
2998 * This is necessary because the trace only records execution branches and 16
2999 * consecutive instructions (rollovers), so last few typically missed.
3000 */
3001 if (current_pc == 0)
3002 return ERROR_OK; /* current_pc was never found */
3003
3004 /* how many instructions remaining? */
3005 int gap_count = (breakpoint_pc - current_pc) /
3006 (xscale->trace.core_state == ARM_STATE_ARM ? 4 : 2);
3007
3008 /* should never be negative or over 16, but verify */
3009 if (gap_count < 0 || gap_count > 16)
3010 {
3011 LOG_WARNING("trace is suspect: excessive gap at end of trace");
3012 return ERROR_OK; /* bail; large number or negative value no good */
3013 }
3014
3015 /* display remaining instructions */
3016 for (i = 0; i < gap_count; i++)
3017 {
3018 xscale_display_instruction(target, current_pc, &instruction, cmd_ctx);
3019 current_pc += xscale->trace.core_state == ARM_STATE_ARM ? 4 : 2;
3020 }
3021
3022 return ERROR_OK;
3023 }
3024
3025 static const struct reg_arch_type xscale_reg_type = {
3026 .get = xscale_get_reg,
3027 .set = xscale_set_reg,
3028 };
3029
3030 static void xscale_build_reg_cache(struct target *target)
3031 {
3032 struct xscale_common *xscale = target_to_xscale(target);
3033 struct arm *armv4_5 = &xscale->armv4_5_common;
3034 struct reg_cache **cache_p = register_get_last_cache_p(&target->reg_cache);
3035 struct xscale_reg *arch_info = malloc(sizeof(xscale_reg_arch_info));
3036 int i;
3037 int num_regs = ARRAY_SIZE(xscale_reg_arch_info);
3038
3039 (*cache_p) = arm_build_reg_cache(target, armv4_5);
3040
3041 (*cache_p)->next = malloc(sizeof(struct reg_cache));
3042 cache_p = &(*cache_p)->next;
3043
3044 /* fill in values for the xscale reg cache */
3045 (*cache_p)->name = "XScale registers";
3046 (*cache_p)->next = NULL;
3047 (*cache_p)->reg_list = malloc(num_regs * sizeof(struct reg));
3048 (*cache_p)->num_regs = num_regs;
3049
3050 for (i = 0; i < num_regs; i++)
3051 {
3052 (*cache_p)->reg_list[i].name = xscale_reg_list[i];
3053 (*cache_p)->reg_list[i].value = calloc(4, 1);
3054 (*cache_p)->reg_list[i].dirty = 0;
3055 (*cache_p)->reg_list[i].valid = 0;
3056 (*cache_p)->reg_list[i].size = 32;
3057 (*cache_p)->reg_list[i].arch_info = &arch_info[i];
3058 (*cache_p)->reg_list[i].type = &xscale_reg_type;
3059 arch_info[i] = xscale_reg_arch_info[i];
3060 arch_info[i].target = target;
3061 }
3062
3063 xscale->reg_cache = (*cache_p);
3064 }
3065
3066 static int xscale_init_target(struct command_context *cmd_ctx,
3067 struct target *target)
3068 {
3069 xscale_build_reg_cache(target);
3070 return ERROR_OK;
3071 }
3072
3073 static int xscale_init_arch_info(struct target *target,
3074 struct xscale_common *xscale, struct jtag_tap *tap, const char *variant)
3075 {
3076 struct arm *armv4_5;
3077 uint32_t high_reset_branch, low_reset_branch;
3078 int i;
3079
3080 armv4_5 = &xscale->armv4_5_common;
3081
3082 /* store architecture specfic data */
3083 xscale->common_magic = XSCALE_COMMON_MAGIC;
3084
3085 /* we don't really *need* a variant param ... */
3086 if (variant) {
3087 int ir_length = 0;
3088
3089 if (strcmp(variant, "pxa250") == 0
3090 || strcmp(variant, "pxa255") == 0
3091 || strcmp(variant, "pxa26x") == 0)
3092 ir_length = 5;
3093 else if (strcmp(variant, "pxa27x") == 0
3094 || strcmp(variant, "ixp42x") == 0
3095 || strcmp(variant, "ixp45x") == 0
3096 || strcmp(variant, "ixp46x") == 0)
3097 ir_length = 7;
3098 else if (strcmp(variant, "pxa3xx") == 0)
3099 ir_length = 11;
3100 else
3101 LOG_WARNING("%s: unrecognized variant %s",
3102 tap->dotted_name, variant);
3103
3104 if (ir_length && ir_length != tap->ir_length) {
3105 LOG_WARNING("%s: IR length for %s is %d; fixing",
3106 tap->dotted_name, variant, ir_length);
3107 tap->ir_length = ir_length;
3108 }
3109 }
3110
3111 /* PXA3xx shifts the JTAG instructions */
3112 if (tap->ir_length == 11)
3113 xscale->xscale_variant = XSCALE_PXA3XX;
3114 else
3115 xscale->xscale_variant = XSCALE_IXP4XX_PXA2XX;
3116
3117 /* the debug handler isn't installed (and thus not running) at this time */
3118 xscale->handler_address = 0xfe000800;
3119
3120 /* clear the vectors we keep locally for reference */
3121 memset(xscale->low_vectors, 0, sizeof(xscale->low_vectors));
3122 memset(xscale->high_vectors, 0, sizeof(xscale->high_vectors));
3123
3124 /* no user-specified vectors have been configured yet */
3125 xscale->static_low_vectors_set = 0x0;
3126 xscale->static_high_vectors_set = 0x0;
3127
3128 /* calculate branches to debug handler */
3129 low_reset_branch = (xscale->handler_address + 0x20 - 0x0 - 0x8) >> 2;
3130 high_reset_branch = (xscale->handler_address + 0x20 - 0xffff0000 - 0x8) >> 2;
3131
3132 xscale->low_vectors[0] = ARMV4_5_B((low_reset_branch & 0xffffff), 0);
3133 xscale->high_vectors[0] = ARMV4_5_B((high_reset_branch & 0xffffff), 0);
3134
3135 for (i = 1; i <= 7; i++)
3136 {
3137 xscale->low_vectors[i] = ARMV4_5_B(0xfffffe, 0);
3138 xscale->high_vectors[i] = ARMV4_5_B(0xfffffe, 0);
3139 }
3140
3141 /* 64kB aligned region used for DCache cleaning */
3142 xscale->cache_clean_address = 0xfffe0000;
3143
3144 xscale->hold_rst = 0;
3145 xscale->external_debug_break = 0;
3146
3147 xscale->ibcr_available = 2;
3148 xscale->ibcr0_used = 0;
3149 xscale->ibcr1_used = 0;
3150
3151 xscale->dbr_available = 2;
3152 xscale->dbr0_used = 0;
3153 xscale->dbr1_used = 0;
3154
3155 LOG_INFO("%s: hardware has 2 breakpoints and 2 watchpoints",
3156 target_name(target));
3157
3158 xscale->arm_bkpt = ARMV5_BKPT(0x0);
3159 xscale->thumb_bkpt = ARMV5_T_BKPT(0x0) & 0xffff;
3160
3161 xscale->vector_catch = 0x1;
3162
3163 xscale->trace.data = NULL;
3164 xscale->trace.image = NULL;
3165 xscale->trace.mode = XSCALE_TRACE_DISABLED;
3166 xscale->trace.buffer_fill = 0;
3167 xscale->trace.fill_counter = 0;
3168
3169 /* prepare ARMv4/5 specific information */
3170 armv4_5->arch_info = xscale;
3171 armv4_5->read_core_reg = xscale_read_core_reg;
3172 armv4_5->write_core_reg = xscale_write_core_reg;
3173 armv4_5->full_context = xscale_full_context;
3174
3175 arm_init_arch_info(target, armv4_5);
3176
3177 xscale->armv4_5_mmu.armv4_5_cache.ctype = -1;
3178 xscale->armv4_5_mmu.get_ttb = xscale_get_ttb;
3179 xscale->armv4_5_mmu.read_memory = xscale_read_memory;
3180 xscale->armv4_5_mmu.write_memory = xscale_write_memory;
3181 xscale->armv4_5_mmu.disable_mmu_caches = xscale_disable_mmu_caches;
3182 xscale->armv4_5_mmu.enable_mmu_caches = xscale_enable_mmu_caches;
3183 xscale->armv4_5_mmu.has_tiny_pages = 1;
3184 xscale->armv4_5_mmu.mmu_enabled = 0;
3185
3186 return ERROR_OK;
3187 }
3188
3189 static int xscale_target_create(struct target *target, Jim_Interp *interp)
3190 {
3191 struct xscale_common *xscale;
3192
3193 if (sizeof xscale_debug_handler - 1 > 0x800) {
3194 LOG_ERROR("debug_handler.bin: larger than 2kb");
3195 return ERROR_FAIL;
3196 }
3197
3198 xscale = calloc(1, sizeof(*xscale));
3199 if (!xscale)
3200 return ERROR_FAIL;
3201
3202 return xscale_init_arch_info(target, xscale, target->tap,
3203 target->variant);
3204 }
3205
3206 COMMAND_HANDLER(xscale_handle_debug_handler_command)
3207 {
3208 struct target *target = NULL;
3209 struct xscale_common *xscale;
3210 int retval;
3211 uint32_t handler_address;
3212
3213 if (CMD_ARGC < 2)
3214 {
3215 LOG_ERROR("'xscale debug_handler <target#> <address>' command takes two required operands");
3216 return ERROR_OK;
3217 }
3218
3219 if ((target = get_target(CMD_ARGV[0])) == NULL)
3220 {
3221 LOG_ERROR("target '%s' not defined", CMD_ARGV[0]);
3222 return ERROR_FAIL;
3223 }
3224
3225 xscale = target_to_xscale(target);
3226 retval = xscale_verify_pointer(CMD_CTX, xscale);
3227 if (retval != ERROR_OK)
3228 return retval;
3229
3230 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], handler_address);
3231
3232 if (((handler_address >= 0x800) && (handler_address <= 0x1fef800)) ||
3233 ((handler_address >= 0xfe000800) && (handler_address <= 0xfffff800)))
3234 {
3235 xscale->handler_address = handler_address;
3236 }
3237 else
3238 {
3239 LOG_ERROR("xscale debug_handler <address> must be between 0x800 and 0x1fef800 or between 0xfe000800 and 0xfffff800");
3240 return ERROR_FAIL;
3241 }
3242
3243 return ERROR_OK;
3244 }
3245
3246 COMMAND_HANDLER(xscale_handle_cache_clean_address_command)
3247 {
3248 struct target *target = NULL;
3249 struct xscale_common *xscale;
3250 int retval;
3251 uint32_t cache_clean_address;
3252
3253 if (CMD_ARGC < 2)
3254 {
3255 return ERROR_COMMAND_SYNTAX_ERROR;
3256 }
3257
3258 target = get_target(CMD_ARGV[0]);
3259 if (target == NULL)
3260 {
3261 LOG_ERROR("target '%s' not defined", CMD_ARGV[0]);
3262 return ERROR_FAIL;
3263 }
3264 xscale = target_to_xscale(target);
3265 retval = xscale_verify_pointer(CMD_CTX, xscale);
3266 if (retval != ERROR_OK)
3267 return retval;
3268
3269 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], cache_clean_address);
3270
3271 if (cache_clean_address & 0xffff)
3272 {
3273 LOG_ERROR("xscale cache_clean_address <address> must be 64kb aligned");
3274 }
3275 else
3276 {
3277 xscale->cache_clean_address = cache_clean_address;
3278 }
3279
3280 return ERROR_OK;
3281 }
3282
3283 COMMAND_HANDLER(xscale_handle_cache_info_command)
3284 {
3285 struct target *target = get_current_target(CMD_CTX);
3286 struct xscale_common *xscale = target_to_xscale(target);
3287 int retval;
3288
3289 retval = xscale_verify_pointer(CMD_CTX, xscale);
3290 if (retval != ERROR_OK)
3291 return retval;
3292
3293 return armv4_5_handle_cache_info_command(CMD_CTX, &xscale->armv4_5_mmu.armv4_5_cache);
3294 }
3295
3296 static int xscale_virt2phys(struct target *target,
3297 uint32_t virtual, uint32_t *physical)
3298 {
3299 struct xscale_common *xscale = target_to_xscale(target);
3300 uint32_t cb;
3301
3302 if (xscale->common_magic != XSCALE_COMMON_MAGIC) {
3303 LOG_ERROR(xscale_not);
3304 return ERROR_TARGET_INVALID;
3305 }
3306
3307 uint32_t ret;
3308 int retval = armv4_5_mmu_translate_va(target, &xscale->armv4_5_mmu,
3309 virtual, &cb, &ret);
3310 if (retval != ERROR_OK)
3311 return retval;
3312 *physical = ret;
3313 return ERROR_OK;
3314 }
3315
3316 static int xscale_mmu(struct target *target, int *enabled)
3317 {
3318 struct xscale_common *xscale = target_to_xscale(target);
3319
3320 if (target->state != TARGET_HALTED)
3321 {
3322 LOG_ERROR("Target not halted");
3323 return ERROR_TARGET_INVALID;
3324 }
3325 *enabled = xscale->armv4_5_mmu.mmu_enabled;
3326 return ERROR_OK;
3327 }
3328
3329 COMMAND_HANDLER(xscale_handle_mmu_command)
3330 {
3331 struct target *target = get_current_target(CMD_CTX);
3332 struct xscale_common *xscale = target_to_xscale(target);
3333 int retval;
3334
3335 retval = xscale_verify_pointer(CMD_CTX, xscale);
3336 if (retval != ERROR_OK)
3337 return retval;
3338
3339 if (target->state != TARGET_HALTED)
3340 {
3341 command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME);
3342 return ERROR_OK;
3343 }
3344
3345 if (CMD_ARGC >= 1)
3346 {
3347 bool enable;
3348 COMMAND_PARSE_ENABLE(CMD_ARGV[0], enable);
3349 if (enable)
3350 xscale_enable_mmu_caches(target, 1, 0, 0);
3351 else
3352 xscale_disable_mmu_caches(target, 1, 0, 0);
3353 xscale->armv4_5_mmu.mmu_enabled = enable;
3354 }
3355
3356 command_print(CMD_CTX, "mmu %s", (xscale->armv4_5_mmu.mmu_enabled) ? "enabled" : "disabled");
3357
3358 return ERROR_OK;
3359 }
3360
3361 COMMAND_HANDLER(xscale_handle_idcache_command)
3362 {
3363 struct target *target = get_current_target(CMD_CTX);
3364 struct xscale_common *xscale = target_to_xscale(target);
3365
3366 int retval = xscale_verify_pointer(CMD_CTX, xscale);
3367 if (retval != ERROR_OK)
3368 return retval;
3369
3370 if (target->state != TARGET_HALTED)
3371 {
3372 command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME);
3373 return ERROR_OK;
3374 }
3375
3376 bool icache = false;
3377 if (strcmp(CMD_NAME, "icache") == 0)
3378 icache = true;
3379 if (CMD_ARGC >= 1)
3380 {
3381 bool enable;
3382 COMMAND_PARSE_ENABLE(CMD_ARGV[0], enable);
3383 if (icache) {
3384 xscale->armv4_5_mmu.armv4_5_cache.i_cache_enabled = enable;
3385 if (enable)
3386 xscale_enable_mmu_caches(target, 0, 0, 1);
3387 else
3388 xscale_disable_mmu_caches(target, 0, 0, 1);
3389 } else {
3390 xscale->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = enable;
3391 if (enable)
3392 xscale_enable_mmu_caches(target, 0, 1, 0);
3393 else
3394 xscale_disable_mmu_caches(target, 0, 1, 0);
3395 }
3396 }
3397
3398 bool enabled = icache ?
3399 xscale->armv4_5_mmu.armv4_5_cache.i_cache_enabled :
3400 xscale->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled;
3401 const char *msg = enabled ? "enabled" : "disabled";
3402 command_print(CMD_CTX, "%s %s", CMD_NAME, msg);
3403
3404 return ERROR_OK;
3405 }
3406
3407 COMMAND_HANDLER(xscale_handle_vector_catch_command)
3408 {
3409 struct target *target = get_current_target(CMD_CTX);
3410 struct xscale_common *xscale = target_to_xscale(target);
3411 int retval;
3412
3413 retval = xscale_verify_pointer(CMD_CTX, xscale);
3414 if (retval != ERROR_OK)
3415 return retval;
3416
3417 if (CMD_ARGC < 1)
3418 {
3419 command_print(CMD_CTX, "usage: xscale vector_catch [mask]");
3420 }
3421 else
3422 {
3423 COMMAND_PARSE_NUMBER(u8, CMD_ARGV[0], xscale->vector_catch);
3424 buf_set_u32(xscale->reg_cache->reg_list[XSCALE_DCSR].value, 16, 8, xscale->vector_catch);
3425 xscale_write_dcsr(target, -1, -1);
3426 }
3427
3428 command_print(CMD_CTX, "vector catch mask: 0x%2.2x", xscale->vector_catch);
3429
3430 return ERROR_OK;
3431 }
3432
3433
3434 COMMAND_HANDLER(xscale_handle_vector_table_command)
3435 {
3436 struct target *target = get_current_target(CMD_CTX);
3437 struct xscale_common *xscale = target_to_xscale(target);
3438 int err = 0;
3439 int retval;
3440
3441 retval = xscale_verify_pointer(CMD_CTX, xscale);
3442 if (retval != ERROR_OK)
3443 return retval;
3444
3445 if (CMD_ARGC == 0) /* print current settings */
3446 {
3447 int idx;
3448
3449 command_print(CMD_CTX, "active user-set static vectors:");
3450 for (idx = 1; idx < 8; idx++)
3451 if (xscale->static_low_vectors_set & (1 << idx))
3452 command_print(CMD_CTX, "low %d: 0x%" PRIx32, idx, xscale->static_low_vectors[idx]);
3453 for (idx = 1; idx < 8; idx++)
3454 if (xscale->static_high_vectors_set & (1 << idx))
3455 command_print(CMD_CTX, "high %d: 0x%" PRIx32, idx, xscale->static_high_vectors[idx]);
3456 return ERROR_OK;
3457 }
3458
3459 if (CMD_ARGC != 3)
3460 err = 1;
3461 else
3462 {
3463 int idx;
3464 COMMAND_PARSE_NUMBER(int, CMD_ARGV[1], idx);
3465 uint32_t vec;
3466 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[2], vec);
3467
3468 if (idx < 1 || idx >= 8)
3469 err = 1;
3470
3471 if (!err && strcmp(CMD_ARGV[0], "low") == 0)
3472 {
3473 xscale->static_low_vectors_set |= (1<<idx);
3474 xscale->static_low_vectors[idx] = vec;
3475 }
3476 else if (!err && (strcmp(CMD_ARGV[0], "high") == 0))
3477 {
3478 xscale->static_high_vectors_set |= (1<<idx);
3479 xscale->static_high_vectors[idx] = vec;
3480 }
3481 else
3482 err = 1;
3483 }
3484
3485 if (err)
3486 command_print(CMD_CTX, "usage: xscale vector_table <high|low> <index> <code>");
3487
3488 return ERROR_OK;
3489 }
3490
3491
3492 COMMAND_HANDLER(xscale_handle_trace_buffer_command)
3493 {
3494 struct target *target = get_current_target(CMD_CTX);
3495 struct xscale_common *xscale = target_to_xscale(target);
3496 uint32_t dcsr_value;
3497 int retval;
3498
3499 retval = xscale_verify_pointer(CMD_CTX, xscale);
3500 if (retval != ERROR_OK)
3501 return retval;
3502
3503 if (target->state != TARGET_HALTED)
3504 {
3505 command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME);
3506 return ERROR_OK;
3507 }
3508
3509 if (CMD_ARGC >= 1)
3510 {
3511 if (strcmp("enable", CMD_ARGV[0]) == 0)
3512 xscale->trace.mode = XSCALE_TRACE_WRAP; /* default */
3513 else if (strcmp("disable", CMD_ARGV[0]) == 0)
3514 xscale->trace.mode = XSCALE_TRACE_DISABLED;
3515 else
3516 return ERROR_COMMAND_SYNTAX_ERROR;
3517 }
3518
3519 if (CMD_ARGC >= 2 && xscale->trace.mode != XSCALE_TRACE_DISABLED)
3520 {
3521 if (strcmp("fill", CMD_ARGV[1]) == 0)
3522 {
3523 int buffcount = 1; /* default */
3524 if (CMD_ARGC >= 3)
3525 COMMAND_PARSE_NUMBER(int, CMD_ARGV[2], buffcount);
3526 if (buffcount < 1) /* invalid */
3527 {
3528 command_print(CMD_CTX, "fill buffer count must be > 0");
3529 xscale->trace.mode = XSCALE_TRACE_DISABLED;
3530 return ERROR_COMMAND_SYNTAX_ERROR;
3531 }
3532 xscale->trace.buffer_fill = buffcount;
3533 xscale->trace.mode = XSCALE_TRACE_FILL;
3534 }
3535 else if (strcmp("wrap", CMD_ARGV[1]) == 0)
3536 xscale->trace.mode = XSCALE_TRACE_WRAP;
3537 else
3538 {
3539 xscale->trace.mode = XSCALE_TRACE_DISABLED;
3540 return ERROR_COMMAND_SYNTAX_ERROR;
3541 }
3542 }
3543
3544 if (xscale->trace.mode != XSCALE_TRACE_DISABLED)
3545 {
3546 char fill_string[12];
3547 sprintf(fill_string, "fill %" PRId32, xscale->trace.buffer_fill);
3548 command_print(CMD_CTX, "trace buffer enabled (%s)",
3549 (xscale->trace.mode == XSCALE_TRACE_FILL)
3550 ? fill_string : "wrap");
3551 }
3552 else
3553 command_print(CMD_CTX, "trace buffer disabled");
3554
3555 dcsr_value = buf_get_u32(xscale->reg_cache->reg_list[XSCALE_DCSR].value, 0, 32);
3556 if (xscale->trace.mode == XSCALE_TRACE_FILL)
3557 xscale_write_dcsr_sw(target, (dcsr_value & 0xfffffffc) | 2);
3558 else
3559 xscale_write_dcsr_sw(target, dcsr_value & 0xfffffffc);
3560
3561 return ERROR_OK;
3562 }
3563
3564 COMMAND_HANDLER(xscale_handle_trace_image_command)
3565 {
3566 struct target *target = get_current_target(CMD_CTX);
3567 struct xscale_common *xscale = target_to_xscale(target);
3568 int retval;
3569
3570 if (CMD_ARGC < 1)
3571 {
3572 command_print(CMD_CTX, "usage: xscale trace_image <file> [base address] [type]");
3573 return ERROR_OK;
3574 }
3575
3576 retval = xscale_verify_pointer(CMD_CTX, xscale);
3577 if (retval != ERROR_OK)
3578 return retval;
3579
3580 if (xscale->trace.image)
3581 {
3582 image_close(xscale->trace.image);
3583 free(xscale->trace.image);
3584 command_print(CMD_CTX, "previously loaded image found and closed");
3585 }
3586
3587 xscale->trace.image = malloc(sizeof(struct image));
3588 xscale->trace.image->base_address_set = 0;
3589 xscale->trace.image->start_address_set = 0;
3590
3591 /* a base address isn't always necessary, default to 0x0 (i.e. don't relocate) */
3592 if (CMD_ARGC >= 2)
3593 {
3594 xscale->trace.image->base_address_set = 1;
3595 COMMAND_PARSE_NUMBER(llong, CMD_ARGV[1], xscale->trace.image->base_address);
3596 }
3597 else
3598 {
3599 xscale->trace.image->base_address_set = 0;
3600 }
3601
3602 if (image_open(xscale->trace.image, CMD_ARGV[0], (CMD_ARGC >= 3) ? CMD_ARGV[2] : NULL) != ERROR_OK)
3603 {
3604 free(xscale->trace.image);
3605 xscale->trace.image = NULL;
3606 return ERROR_OK;
3607 }
3608
3609 return ERROR_OK;
3610 }
3611
3612 COMMAND_HANDLER(xscale_handle_dump_trace_command)
3613 {
3614 struct target *target = get_current_target(CMD_CTX);
3615 struct xscale_common *xscale = target_to_xscale(target);
3616 struct xscale_trace_data *trace_data;
3617 struct fileio file;
3618 int retval;
3619
3620 retval = xscale_verify_pointer(CMD_CTX, xscale);
3621 if (retval != ERROR_OK)
3622 return retval;
3623
3624 if (target->state != TARGET_HALTED)
3625 {
3626 command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME);
3627 return ERROR_OK;
3628 }
3629
3630 if (CMD_ARGC < 1)
3631 {
3632 command_print(CMD_CTX, "usage: xscale dump_trace <file>");
3633 return ERROR_OK;
3634 }
3635
3636 trace_data = xscale->trace.data;
3637
3638 if (!trace_data)
3639 {
3640 command_print(CMD_CTX, "no trace data collected");
3641 return ERROR_OK;
3642 }
3643
3644 if (fileio_open(&file, CMD_ARGV[0], FILEIO_WRITE, FILEIO_BINARY) != ERROR_OK)
3645 {
3646 return ERROR_OK;
3647 }
3648
3649 while (trace_data)
3650 {
3651 int i;
3652
3653 fileio_write_u32(&file, trace_data->chkpt0);
3654 fileio_write_u32(&file, trace_data->chkpt1);
3655 fileio_write_u32(&file, trace_data->last_instruction);
3656 fileio_write_u32(&file, trace_data->depth);
3657
3658 for (i = 0; i < trace_data->depth; i++)
3659 fileio_write_u32(&file, trace_data->entries[i].data | ((trace_data->entries[i].type & 0xffff) << 16));
3660
3661 trace_data = trace_data->next;
3662 }
3663
3664 fileio_close(&file);
3665
3666 return ERROR_OK;
3667 }
3668
3669 COMMAND_HANDLER(xscale_handle_analyze_trace_buffer_command)
3670 {
3671 struct target *target = get_current_target(CMD_CTX);
3672 struct xscale_common *xscale = target_to_xscale(target);
3673 int retval;
3674
3675 retval = xscale_verify_pointer(CMD_CTX, xscale);
3676 if (retval != ERROR_OK)
3677 return retval;
3678
3679 xscale_analyze_trace(target, CMD_CTX);
3680
3681 return ERROR_OK;
3682 }
3683
3684 COMMAND_HANDLER(xscale_handle_cp15)
3685 {
3686 struct target *target = get_current_target(CMD_CTX);
3687 struct xscale_common *xscale = target_to_xscale(target);
3688 int retval;
3689
3690 retval = xscale_verify_pointer(CMD_CTX, xscale);
3691 if (retval != ERROR_OK)
3692 return retval;
3693
3694 if (target->state != TARGET_HALTED)
3695 {
3696 command_print(CMD_CTX, "target must be stopped for \"%s\" command", CMD_NAME);
3697 return ERROR_OK;
3698 }
3699 uint32_t reg_no = 0;
3700 struct reg *reg = NULL;
3701 if (CMD_ARGC > 0)
3702 {
3703 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[0], reg_no);
3704 /*translate from xscale cp15 register no to openocd register*/
3705 switch (reg_no)
3706 {
3707 case 0:
3708 reg_no = XSCALE_MAINID;
3709 break;
3710 case 1:
3711 reg_no = XSCALE_CTRL;
3712 break;
3713 case 2:
3714 reg_no = XSCALE_TTB;
3715 break;
3716 case 3:
3717 reg_no = XSCALE_DAC;
3718 break;
3719 case 5:
3720 reg_no = XSCALE_FSR;
3721 break;
3722 case 6:
3723 reg_no = XSCALE_FAR;
3724 break;
3725 case 13:
3726 reg_no = XSCALE_PID;
3727 break;
3728 case 15:
3729 reg_no = XSCALE_CPACCESS;
3730 break;
3731 default:
3732 command_print(CMD_CTX, "invalid register number");
3733 return ERROR_COMMAND_SYNTAX_ERROR;
3734 }
3735 reg = &xscale->reg_cache->reg_list[reg_no];
3736
3737 }
3738 if (CMD_ARGC == 1)
3739 {
3740 uint32_t value;
3741
3742 /* read cp15 control register */
3743 xscale_get_reg(reg);
3744 value = buf_get_u32(reg->value, 0, 32);
3745 command_print(CMD_CTX, "%s (/%i): 0x%" PRIx32 "", reg->name, (int)(reg->size), value);
3746 }
3747 else if (CMD_ARGC == 2)
3748 {
3749 uint32_t value;
3750 COMMAND_PARSE_NUMBER(u32, CMD_ARGV[1], value);
3751
3752 /* send CP write request (command 0x41) */
3753 xscale_send_u32(target, 0x41);
3754
3755 /* send CP register number */
3756 xscale_send_u32(target, reg_no);
3757
3758 /* send CP register value */
3759 xscale_send_u32(target, value);
3760
3761 /* execute cpwait to ensure outstanding operations complete */
3762 xscale_send_u32(target, 0x53);
3763 }
3764 else
3765 {
3766 command_print(CMD_CTX, "usage: cp15 [register]<, [value]>");
3767 }
3768
3769 return ERROR_OK;
3770 }
3771
3772 static const struct command_registration xscale_exec_command_handlers[] = {
3773 {
3774 .name = "cache_info",
3775 .handler = xscale_handle_cache_info_command,
3776 .mode = COMMAND_EXEC,
3777 .help = "display information about CPU caches",
3778 },
3779 {
3780 .name = "mmu",
3781 .handler = xscale_handle_mmu_command,
3782 .mode = COMMAND_EXEC,
3783 .help = "enable or disable the MMU",
3784 .usage = "['enable'|'disable']",
3785 },
3786 {
3787 .name = "icache",
3788 .handler = xscale_handle_idcache_command,
3789 .mode = COMMAND_EXEC,
3790 .help = "display ICache state, optionally enabling or "
3791 "disabling it",
3792 .usage = "['enable'|'disable']",
3793 },
3794 {
3795 .name = "dcache",
3796 .handler = xscale_handle_idcache_command,
3797 .mode = COMMAND_EXEC,
3798 .help = "display DCache state, optionally enabling or "
3799 "disabling it",
3800 .usage = "['enable'|'disable']",
3801 },
3802 {
3803 .name = "vector_catch",
3804 .handler = xscale_handle_vector_catch_command,
3805 .mode = COMMAND_EXEC,
3806 .help = "set or display 8-bit mask of vectors "
3807 "that should trigger debug entry",
3808 .usage = "[mask]",
3809 },
3810 {
3811 .name = "vector_table",
3812 .handler = xscale_handle_vector_table_command,
3813 .mode = COMMAND_EXEC,
3814 .help = "set vector table entry in mini-ICache, "
3815 "or display current tables",
3816 .usage = "[('high'|'low') index code]",
3817 },
3818 {
3819 .name = "trace_buffer",
3820 .handler = xscale_handle_trace_buffer_command,
3821 .mode = COMMAND_EXEC,
3822 .help = "display trace buffer status, enable or disable "
3823 "tracing, and optionally reconfigure trace mode",
3824 .usage = "['enable'|'disable' ['fill' [number]|'wrap']]",
3825 },
3826 {
3827 .name = "dump_trace",
3828 .handler = xscale_handle_dump_trace_command,
3829 .mode = COMMAND_EXEC,
3830 .help = "dump content of trace buffer to file",
3831 .usage = "filename",
3832 },
3833 {
3834 .name = "analyze_trace",
3835 .handler = xscale_handle_analyze_trace_buffer_command,
3836 .mode = COMMAND_EXEC,
3837 .help = "analyze content of trace buffer",
3838 .usage = "",
3839 },
3840 {
3841 .name = "trace_image",
3842 .handler = xscale_handle_trace_image_command,
3843 .mode = COMMAND_EXEC,
3844 .help = "load image from file to address (default 0)",
3845 .usage = "filename [offset [filetype]]",
3846 },
3847 {
3848 .name = "cp15",
3849 .handler = xscale_handle_cp15,
3850 .mode = COMMAND_EXEC,
3851 .help = "Read or write coprocessor 15 register.",
3852 .usage = "register [value]",
3853 },
3854 COMMAND_REGISTRATION_DONE
3855 };
3856 static const struct command_registration xscale_any_command_handlers[] = {
3857 {
3858 .name = "debug_handler",
3859 .handler = xscale_handle_debug_handler_command,
3860 .mode = COMMAND_ANY,
3861 .help = "Change address used for debug handler.",
3862 .usage = "target address",
3863 },
3864 {
3865 .name = "cache_clean_address",
3866 .handler = xscale_handle_cache_clean_address_command,
3867 .mode = COMMAND_ANY,
3868 .help = "Change address used for cleaning data cache.",
3869 .usage = "address",
3870 },
3871 {
3872 .chain = xscale_exec_command_handlers,
3873 },
3874 COMMAND_REGISTRATION_DONE
3875 };
3876 static const struct command_registration xscale_command_handlers[] = {
3877 {
3878 .chain = arm_command_handlers,
3879 },
3880 {
3881 .name = "xscale",
3882 .mode = COMMAND_ANY,
3883 .help = "xscale command group",
3884 .chain = xscale_any_command_handlers,
3885 },
3886 COMMAND_REGISTRATION_DONE
3887 };
3888
3889 struct target_type xscale_target =
3890 {
3891 .name = "xscale",
3892
3893 .poll = xscale_poll,
3894 .arch_state = xscale_arch_state,
3895
3896 .target_request_data = NULL,
3897
3898 .halt = xscale_halt,
3899 .resume = xscale_resume,
3900 .step = xscale_step,
3901
3902 .assert_reset = xscale_assert_reset,
3903 .deassert_reset = xscale_deassert_reset,
3904 .soft_reset_halt = NULL,
3905
3906 /* REVISIT on some cores, allow exporting iwmmxt registers ... */
3907 .get_gdb_reg_list = arm_get_gdb_reg_list,
3908
3909 .read_memory = xscale_read_memory,
3910 .read_phys_memory = xscale_read_phys_memory,
3911 .write_memory = xscale_write_memory,
3912 .write_phys_memory = xscale_write_phys_memory,
3913 .bulk_write_memory = xscale_bulk_write_memory,
3914
3915 .checksum_memory = arm_checksum_memory,
3916 .blank_check_memory = arm_blank_check_memory,
3917
3918 .run_algorithm = armv4_5_run_algorithm,
3919
3920 .add_breakpoint = xscale_add_breakpoint,
3921 .remove_breakpoint = xscale_remove_breakpoint,
3922 .add_watchpoint = xscale_add_watchpoint,
3923 .remove_watchpoint = xscale_remove_watchpoint,
3924
3925 .commands = xscale_command_handlers,
3926 .target_create = xscale_target_create,
3927 .init_target = xscale_init_target,
3928
3929 .virt2phys = xscale_virt2phys,
3930 .mmu = xscale_mmu
3931 };
Andreas' development fork