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Remove FSF address from GPL notices
[openocd.git] / src / target / arm926ejs.c
blob397859bd6c108a78d3f1231159b145dfce331b98
1 /***************************************************************************
2 * Copyright (C) 2007 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * Copyright (C) 2007,2008,2009 by Øyvind Harboe *
6 * oyvind.harboe@zylin.com *
7 * *
8 * This program is free software; you can redistribute it and/or modify *
9 * it under the terms of the GNU General Public License as published by *
10 * the Free Software Foundation; either version 2 of the License, or *
11 * (at your option) any later version. *
12 * *
13 * This program is distributed in the hope that it will be useful, *
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16 * GNU General Public License for more details. *
17 * *
18 * You should have received a copy of the GNU General Public License *
19 * along with this program. If not, see <http://www.gnu.org/licenses/>. *
20 ***************************************************************************/
21
22 #ifdef HAVE_CONFIG_H
23 #include "config.h"
24 #endif
25
26 #include "arm926ejs.h"
27 #include <helper/time_support.h>
28 #include "target_type.h"
29 #include "register.h"
30 #include "arm_opcodes.h"
31
32
33 /*
34 * The ARM926 is built around the ARM9EJ-S core, and most JTAG docs
35 * are in the ARM9EJ-S Technical Reference Manual (ARM DDI 0222B) not
36 * the ARM926 manual (ARM DDI 0198E). The scan chains are:
37 *
38 * 1 ... core debugging
39 * 2 ... EmbeddedICE
40 * 3 ... external boundary scan (SoC-specific, unused here)
41 * 6 ... ETM
42 * 15 ... coprocessor 15
43 */
44
45 #if 0
46 #define _DEBUG_INSTRUCTION_EXECUTION_
47 #endif
48
49 #define ARM926EJS_CP15_ADDR(opcode_1, opcode_2, CRn, CRm) ((opcode_1 << 11) | (opcode_2 << 8) | (CRn << 4) | (CRm << 0))
50
51 static int arm926ejs_cp15_read(struct target *target, uint32_t op1, uint32_t op2,
52 uint32_t CRn, uint32_t CRm, uint32_t *value)
53 {
54 int retval = ERROR_OK;
55 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
56 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
57 uint32_t address = ARM926EJS_CP15_ADDR(op1, op2, CRn, CRm);
58 struct scan_field fields[4];
59 uint8_t address_buf[2] = {0, 0};
60 uint8_t nr_w_buf = 0;
61 uint8_t access_t = 1;
62
63 buf_set_u32(address_buf, 0, 14, address);
64
65 retval = arm_jtag_scann(jtag_info, 0xf, TAP_IDLE);
66 if (retval != ERROR_OK)
67 return retval;
68 retval = arm_jtag_set_instr(jtag_info->tap, jtag_info->intest_instr, NULL, TAP_IDLE);
69 if (retval != ERROR_OK)
70 return retval;
71
72 fields[0].num_bits = 32;
73 fields[0].out_value = NULL;
74 fields[0].in_value = (uint8_t *)value;
75
76 fields[1].num_bits = 1;
77 fields[1].out_value = &access_t;
78 fields[1].in_value = &access_t;
79
80 fields[2].num_bits = 14;
81 fields[2].out_value = address_buf;
82 fields[2].in_value = NULL;
83
84 fields[3].num_bits = 1;
85 fields[3].out_value = &nr_w_buf;
86 fields[3].in_value = NULL;
87
88 jtag_add_dr_scan(jtag_info->tap, 4, fields, TAP_IDLE);
89
90 long long then = timeval_ms();
91
92 for (;;) {
93 /* rescan with NOP, to wait for the access to complete */
94 access_t = 0;
95 nr_w_buf = 0;
96 jtag_add_dr_scan(jtag_info->tap, 4, fields, TAP_IDLE);
97
98 jtag_add_callback(arm_le_to_h_u32, (jtag_callback_data_t)value);
99
100 retval = jtag_execute_queue();
101 if (retval != ERROR_OK)
102 return retval;
103
104 if (buf_get_u32(&access_t, 0, 1) == 1)
105 break;
106
107 /* 10ms timeout */
108 if ((timeval_ms()-then) > 10) {
109 LOG_ERROR("cp15 read operation timed out");
110 return ERROR_FAIL;
111 }
112 }
113
114 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
115 LOG_DEBUG("addr: 0x%x value: %8.8x", address, *value);
116 #endif
117
118 retval = arm_jtag_set_instr(jtag_info->tap, 0xc, NULL, TAP_IDLE);
119 if (retval != ERROR_OK)
120 return retval;
121
122 return ERROR_OK;
123 }
124
125 static int arm926ejs_mrc(struct target *target, int cpnum, uint32_t op1,
126 uint32_t op2, uint32_t CRn, uint32_t CRm, uint32_t *value)
127 {
128 if (cpnum != 15) {
129 LOG_ERROR("Only cp15 is supported");
130 return ERROR_FAIL;
131 }
132 return arm926ejs_cp15_read(target, op1, op2, CRn, CRm, value);
133 }
134
135 static int arm926ejs_cp15_write(struct target *target, uint32_t op1, uint32_t op2,
136 uint32_t CRn, uint32_t CRm, uint32_t value)
137 {
138 int retval = ERROR_OK;
139 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
140 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
141 uint32_t address = ARM926EJS_CP15_ADDR(op1, op2, CRn, CRm);
142 struct scan_field fields[4];
143 uint8_t value_buf[4];
144 uint8_t address_buf[2] = {0, 0};
145 uint8_t nr_w_buf = 1;
146 uint8_t access_t = 1;
147
148 buf_set_u32(address_buf, 0, 14, address);
149 buf_set_u32(value_buf, 0, 32, value);
150
151 retval = arm_jtag_scann(jtag_info, 0xf, TAP_IDLE);
152 if (retval != ERROR_OK)
153 return retval;
154 retval = arm_jtag_set_instr(jtag_info->tap, jtag_info->intest_instr, NULL, TAP_IDLE);
155 if (retval != ERROR_OK)
156 return retval;
157
158 fields[0].num_bits = 32;
159 fields[0].out_value = value_buf;
160 fields[0].in_value = NULL;
161
162 fields[1].num_bits = 1;
163 fields[1].out_value = &access_t;
164 fields[1].in_value = &access_t;
165
166 fields[2].num_bits = 14;
167 fields[2].out_value = address_buf;
168 fields[2].in_value = NULL;
169
170 fields[3].num_bits = 1;
171 fields[3].out_value = &nr_w_buf;
172 fields[3].in_value = NULL;
173
174 jtag_add_dr_scan(jtag_info->tap, 4, fields, TAP_IDLE);
175
176 long long then = timeval_ms();
177
178 for (;;) {
179 /* rescan with NOP, to wait for the access to complete */
180 access_t = 0;
181 nr_w_buf = 0;
182 jtag_add_dr_scan(jtag_info->tap, 4, fields, TAP_IDLE);
183 retval = jtag_execute_queue();
184 if (retval != ERROR_OK)
185 return retval;
186
187 if (buf_get_u32(&access_t, 0, 1) == 1)
188 break;
189
190 /* 10ms timeout */
191 if ((timeval_ms()-then) > 10) {
192 LOG_ERROR("cp15 write operation timed out");
193 return ERROR_FAIL;
194 }
195 }
196
197 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
198 LOG_DEBUG("addr: 0x%x value: %8.8x", address, value);
199 #endif
200
201 retval = arm_jtag_set_instr(jtag_info->tap, 0xf, NULL, TAP_IDLE);
202 if (retval != ERROR_OK)
203 return retval;
204
205 return ERROR_OK;
206 }
207
208 static int arm926ejs_mcr(struct target *target, int cpnum, uint32_t op1,
209 uint32_t op2, uint32_t CRn, uint32_t CRm, uint32_t value)
210 {
211 if (cpnum != 15) {
212 LOG_ERROR("Only cp15 is supported");
213 return ERROR_FAIL;
214 }
215 return arm926ejs_cp15_write(target, op1, op2, CRn, CRm, value);
216 }
217
218 static int arm926ejs_examine_debug_reason(struct target *target)
219 {
220 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
221 struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
222 int debug_reason;
223 int retval;
224
225 embeddedice_read_reg(dbg_stat);
226 retval = jtag_execute_queue();
227 if (retval != ERROR_OK)
228 return retval;
229
230 /* Method-Of-Entry (MOE) field */
231 debug_reason = buf_get_u32(dbg_stat->value, 6, 4);
232
233 switch (debug_reason) {
234 case 0:
235 LOG_DEBUG("no *NEW* debug entry (?missed one?)");
236 /* ... since last restart or debug reset ... */
237 target->debug_reason = DBG_REASON_DBGRQ;
238 break;
239 case 1:
240 LOG_DEBUG("breakpoint from EICE unit 0");
241 target->debug_reason = DBG_REASON_BREAKPOINT;
242 break;
243 case 2:
244 LOG_DEBUG("breakpoint from EICE unit 1");
245 target->debug_reason = DBG_REASON_BREAKPOINT;
246 break;
247 case 3:
248 LOG_DEBUG("soft breakpoint (BKPT instruction)");
249 target->debug_reason = DBG_REASON_BREAKPOINT;
250 break;
251 case 4:
252 LOG_DEBUG("vector catch breakpoint");
253 target->debug_reason = DBG_REASON_BREAKPOINT;
254 break;
255 case 5:
256 LOG_DEBUG("external breakpoint");
257 target->debug_reason = DBG_REASON_BREAKPOINT;
258 break;
259 case 6:
260 LOG_DEBUG("watchpoint from EICE unit 0");
261 target->debug_reason = DBG_REASON_WATCHPOINT;
262 break;
263 case 7:
264 LOG_DEBUG("watchpoint from EICE unit 1");
265 target->debug_reason = DBG_REASON_WATCHPOINT;
266 break;
267 case 8:
268 LOG_DEBUG("external watchpoint");
269 target->debug_reason = DBG_REASON_WATCHPOINT;
270 break;
271 case 9:
272 LOG_DEBUG("internal debug request");
273 target->debug_reason = DBG_REASON_DBGRQ;
274 break;
275 case 10:
276 LOG_DEBUG("external debug request");
277 target->debug_reason = DBG_REASON_DBGRQ;
278 break;
279 case 11:
280 LOG_DEBUG("debug re-entry from system speed access");
281 /* This is normal when connecting to something that's
282 * already halted, or in some related code paths, but
283 * otherwise is surprising (and presumably wrong).
284 */
285 switch (target->debug_reason) {
286 case DBG_REASON_DBGRQ:
287 break;
288 default:
289 LOG_ERROR("unexpected -- debug re-entry");
290 /* FALLTHROUGH */
291 case DBG_REASON_UNDEFINED:
292 target->debug_reason = DBG_REASON_DBGRQ;
293 break;
294 }
295 break;
296 case 12:
297 /* FIX!!!! here be dragons!!! We need to fail here so
298 * the target will interpreted as halted but we won't
299 * try to talk to it right now... a resume + halt seems
300 * to sync things up again. Please send an email to
301 * openocd development mailing list if you have hardware
302 * to donate to look into this problem....
303 */
304 LOG_WARNING("WARNING: mystery debug reason MOE = 0xc. Try issuing a resume + halt.");
305 target->debug_reason = DBG_REASON_DBGRQ;
306 break;
307 default:
308 LOG_WARNING("WARNING: unknown debug reason: 0x%x", debug_reason);
309 /* Oh agony! should we interpret this as a halt request or
310 * that the target stopped on it's own accord?
311 */
312 target->debug_reason = DBG_REASON_DBGRQ;
313 /* if we fail here, we won't talk to the target and it will
314 * be reported to be in the halted state */
315 break;
316 }
317
318 return ERROR_OK;
319 }
320
321 static int arm926ejs_get_ttb(struct target *target, uint32_t *result)
322 {
323 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
324 int retval;
325 uint32_t ttb = 0x0;
326
327 retval = arm926ejs->read_cp15(target, 0, 0, 2, 0, &ttb);
328 if (retval != ERROR_OK)
329 return retval;
330
331 *result = ttb;
332
333 return ERROR_OK;
334 }
335
336 static int arm926ejs_disable_mmu_caches(struct target *target, int mmu,
337 int d_u_cache, int i_cache)
338 {
339 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
340 uint32_t cp15_control;
341 int retval;
342
343 /* read cp15 control register */
344 retval = arm926ejs->read_cp15(target, 0, 0, 1, 0, &cp15_control);
345 if (retval != ERROR_OK)
346 return retval;
347 retval = jtag_execute_queue();
348 if (retval != ERROR_OK)
349 return retval;
350
351 if (mmu) {
352 /* invalidate TLB */
353 retval = arm926ejs->write_cp15(target, 0, 0, 8, 7, 0x0);
354 if (retval != ERROR_OK)
355 return retval;
356
357 cp15_control &= ~0x1U;
358 }
359
360 if (d_u_cache) {
361 uint32_t debug_override;
362 /* read-modify-write CP15 debug override register
363 * to enable "test and clean all" */
364 retval = arm926ejs->read_cp15(target, 0, 0, 15, 0, &debug_override);
365 if (retval != ERROR_OK)
366 return retval;
367 debug_override |= 0x80000;
368 retval = arm926ejs->write_cp15(target, 0, 0, 15, 0, debug_override);
369 if (retval != ERROR_OK)
370 return retval;
371
372 /* clean and invalidate DCache */
373 retval = arm926ejs->write_cp15(target, 0, 0, 7, 5, 0x0);
374 if (retval != ERROR_OK)
375 return retval;
376
377 /* write CP15 debug override register
378 * to disable "test and clean all" */
379 debug_override &= ~0x80000;
380 retval = arm926ejs->write_cp15(target, 0, 0, 15, 0, debug_override);
381 if (retval != ERROR_OK)
382 return retval;
383
384 cp15_control &= ~0x4U;
385 }
386
387 if (i_cache) {
388 /* invalidate ICache */
389 retval = arm926ejs->write_cp15(target, 0, 0, 7, 5, 0x0);
390 if (retval != ERROR_OK)
391 return retval;
392
393 cp15_control &= ~0x1000U;
394 }
395
396 retval = arm926ejs->write_cp15(target, 0, 0, 1, 0, cp15_control);
397 return retval;
398 }
399
400 static int arm926ejs_enable_mmu_caches(struct target *target, int mmu,
401 int d_u_cache, int i_cache)
402 {
403 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
404 uint32_t cp15_control;
405 int retval;
406
407 /* read cp15 control register */
408 retval = arm926ejs->read_cp15(target, 0, 0, 1, 0, &cp15_control);
409 if (retval != ERROR_OK)
410 return retval;
411 retval = jtag_execute_queue();
412 if (retval != ERROR_OK)
413 return retval;
414
415 if (mmu)
416 cp15_control |= 0x1U;
417
418 if (d_u_cache)
419 cp15_control |= 0x4U;
420
421 if (i_cache)
422 cp15_control |= 0x1000U;
423
424 retval = arm926ejs->write_cp15(target, 0, 0, 1, 0, cp15_control);
425 return retval;
426 }
427
428 static int arm926ejs_post_debug_entry(struct target *target)
429 {
430 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
431 int retval;
432
433 /* examine cp15 control reg */
434 retval = arm926ejs->read_cp15(target, 0, 0, 1, 0, &arm926ejs->cp15_control_reg);
435 if (retval != ERROR_OK)
436 return retval;
437 retval = jtag_execute_queue();
438 if (retval != ERROR_OK)
439 return retval;
440 LOG_DEBUG("cp15_control_reg: %8.8" PRIx32 "", arm926ejs->cp15_control_reg);
441
442 if (arm926ejs->armv4_5_mmu.armv4_5_cache.ctype == -1) {
443 uint32_t cache_type_reg;
444 /* identify caches */
445 retval = arm926ejs->read_cp15(target, 0, 1, 0, 0, &cache_type_reg);
446 if (retval != ERROR_OK)
447 return retval;
448 retval = jtag_execute_queue();
449 if (retval != ERROR_OK)
450 return retval;
451 armv4_5_identify_cache(cache_type_reg, &arm926ejs->armv4_5_mmu.armv4_5_cache);
452 }
453
454 arm926ejs->armv4_5_mmu.mmu_enabled = (arm926ejs->cp15_control_reg & 0x1U) ? 1 : 0;
455 arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = (arm926ejs->cp15_control_reg & 0x4U) ? 1 : 0;
456 arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled = (arm926ejs->cp15_control_reg & 0x1000U) ? 1 : 0;
457
458 /* save i/d fault status and address register */
459 retval = arm926ejs->read_cp15(target, 0, 0, 5, 0, &arm926ejs->d_fsr);
460 if (retval != ERROR_OK)
461 return retval;
462 retval = arm926ejs->read_cp15(target, 0, 1, 5, 0, &arm926ejs->i_fsr);
463 if (retval != ERROR_OK)
464 return retval;
465 retval = arm926ejs->read_cp15(target, 0, 0, 6, 0, &arm926ejs->d_far);
466 if (retval != ERROR_OK)
467 return retval;
468
469 LOG_DEBUG("D FSR: 0x%8.8" PRIx32 ", D FAR: 0x%8.8" PRIx32 ", I FSR: 0x%8.8" PRIx32 "",
470 arm926ejs->d_fsr, arm926ejs->d_far, arm926ejs->i_fsr);
471
472 uint32_t cache_dbg_ctrl;
473
474 /* read-modify-write CP15 cache debug control register
475 * to disable I/D-cache linefills and force WT */
476 retval = arm926ejs->read_cp15(target, 7, 0, 15, 0, &cache_dbg_ctrl);
477 if (retval != ERROR_OK)
478 return retval;
479 cache_dbg_ctrl |= 0x7;
480 retval = arm926ejs->write_cp15(target, 7, 0, 15, 0, cache_dbg_ctrl);
481 return retval;
482 }
483
484 static void arm926ejs_pre_restore_context(struct target *target)
485 {
486 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
487
488 /* restore i/d fault status and address register */
489 arm926ejs->write_cp15(target, 0, 0, 5, 0, arm926ejs->d_fsr);
490 arm926ejs->write_cp15(target, 0, 1, 5, 0, arm926ejs->i_fsr);
491 arm926ejs->write_cp15(target, 0, 0, 6, 0, arm926ejs->d_far);
492
493 uint32_t cache_dbg_ctrl;
494
495 /* read-modify-write CP15 cache debug control register
496 * to reenable I/D-cache linefills and disable WT */
497 arm926ejs->read_cp15(target, 7, 0, 15, 0, &cache_dbg_ctrl);
498 cache_dbg_ctrl &= ~0x7;
499 arm926ejs->write_cp15(target, 7, 0, 15, 0, cache_dbg_ctrl);
500 }
501
502 static const char arm926_not[] = "target is not an ARM926";
503
504 static int arm926ejs_verify_pointer(struct command_context *cmd_ctx,
505 struct arm926ejs_common *arm926)
506 {
507 if (arm926->common_magic != ARM926EJS_COMMON_MAGIC) {
508 command_print(cmd_ctx, arm926_not);
509 return ERROR_TARGET_INVALID;
510 }
511 return ERROR_OK;
512 }
513
514 /** Logs summary of ARM926 state for a halted target. */
515 int arm926ejs_arch_state(struct target *target)
516 {
517 static const char *state[] = {
518 "disabled", "enabled"
519 };
520
521 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
522
523 if (arm926ejs->common_magic != ARM926EJS_COMMON_MAGIC) {
524 LOG_ERROR("BUG: %s", arm926_not);
525 return ERROR_TARGET_INVALID;
526 }
527
528 arm_arch_state(target);
529 LOG_USER("MMU: %s, D-Cache: %s, I-Cache: %s",
530 state[arm926ejs->armv4_5_mmu.mmu_enabled],
531 state[arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled],
532 state[arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled]);
533
534 return ERROR_OK;
535 }
536
537 int arm926ejs_soft_reset_halt(struct target *target)
538 {
539 int retval = ERROR_OK;
540 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
541 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
542 struct arm *arm = &arm7_9->arm;
543 struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
544
545 retval = target_halt(target);
546 if (retval != ERROR_OK)
547 return retval;
548
549 long long then = timeval_ms();
550 int timeout;
551 while (!(timeout = ((timeval_ms()-then) > 1000))) {
552 if (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_DBGACK, 1) == 0) {
553 embeddedice_read_reg(dbg_stat);
554 retval = jtag_execute_queue();
555 if (retval != ERROR_OK)
556 return retval;
557 } else
558 break;
559 if (debug_level >= 1) {
560 /* do not eat all CPU, time out after 1 se*/
561 alive_sleep(100);
562 } else
563 keep_alive();
564 }
565 if (timeout) {
566 LOG_ERROR("Failed to halt CPU after 1 sec");
567 return ERROR_TARGET_TIMEOUT;
568 }
569
570 target->state = TARGET_HALTED;
571
572 /* SVC, ARM state, IRQ and FIQ disabled */
573 uint32_t cpsr;
574
575 cpsr = buf_get_u32(arm->cpsr->value, 0, 32);
576 cpsr &= ~0xff;
577 cpsr |= 0xd3;
578 arm_set_cpsr(arm, cpsr);
579 arm->cpsr->dirty = 1;
580
581 /* start fetching from 0x0 */
582 buf_set_u32(arm->pc->value, 0, 32, 0x0);
583 arm->pc->dirty = 1;
584 arm->pc->valid = 1;
585
586 retval = arm926ejs_disable_mmu_caches(target, 1, 1, 1);
587 if (retval != ERROR_OK)
588 return retval;
589 arm926ejs->armv4_5_mmu.mmu_enabled = 0;
590 arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = 0;
591 arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled = 0;
592
593 return target_call_event_callbacks(target, TARGET_EVENT_HALTED);
594 }
595
596 /** Writes a buffer, in the specified word size, with current MMU settings. */
597 int arm926ejs_write_memory(struct target *target, uint32_t address,
598 uint32_t size, uint32_t count, const uint8_t *buffer)
599 {
600 int retval;
601 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
602
603 /* FIX!!!! this should be cleaned up and made much more general. The
604 * plan is to write up and test on arm926ejs specifically and
605 * then generalize and clean up afterwards.
606 *
607 *
608 * Also it should be moved to the callbacks that handle breakpoints
609 * specifically and not the generic memory write fn's. See XScale code.
610 **/
611 if (arm926ejs->armv4_5_mmu.mmu_enabled && (count == 1) && ((size == 2) || (size == 4))) {
612 /* special case the handling of single word writes to bypass MMU
613 * to allow implementation of breakpoints in memory marked read only
614 * by MMU */
615 if (arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled) {
616 /* flush and invalidate data cache
617 *
618 * MCR p15,0,p,c7,c10,1 - clean cache line using virtual address
619 *
620 */
621 retval = arm926ejs->write_cp15(target, 0, 1, 7, 10, address&~0x3);
622 if (retval != ERROR_OK)
623 return retval;
624 }
625
626 uint32_t pa;
627 retval = target->type->virt2phys(target, address, &pa);
628 if (retval != ERROR_OK)
629 return retval;
630
631 /* write directly to physical memory bypassing any read only MMU bits, etc. */
632 retval = armv4_5_mmu_write_physical(target, &arm926ejs->armv4_5_mmu, pa, size, count, buffer);
633 if (retval != ERROR_OK)
634 return retval;
635 } else {
636 retval = arm7_9_write_memory(target, address, size, count, buffer);
637 if (retval != ERROR_OK)
638 return retval;
639 }
640
641 /* If ICache is enabled, we have to invalidate affected ICache lines
642 * the DCache is forced to write-through, so we don't have to clean it here
643 */
644 if (arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled) {
645 if (count <= 1) {
646 /* invalidate ICache single entry with MVA */
647 arm926ejs->write_cp15(target, 0, 1, 7, 5, address);
648 } else {
649 /* invalidate ICache */
650 arm926ejs->write_cp15(target, 0, 0, 7, 5, address);
651 }
652 }
653
654 return retval;
655 }
656
657 static int arm926ejs_write_phys_memory(struct target *target,
658 uint32_t address, uint32_t size,
659 uint32_t count, const uint8_t *buffer)
660 {
661 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
662
663 return armv4_5_mmu_write_physical(target, &arm926ejs->armv4_5_mmu,
664 address, size, count, buffer);
665 }
666
667 static int arm926ejs_read_phys_memory(struct target *target,
668 uint32_t address, uint32_t size,
669 uint32_t count, uint8_t *buffer)
670 {
671 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
672
673 return armv4_5_mmu_read_physical(target, &arm926ejs->armv4_5_mmu,
674 address, size, count, buffer);
675 }
676
677 int arm926ejs_init_arch_info(struct target *target, struct arm926ejs_common *arm926ejs,
678 struct jtag_tap *tap)
679 {
680 struct arm7_9_common *arm7_9 = &arm926ejs->arm7_9_common;
681
682 arm7_9->arm.mrc = arm926ejs_mrc;
683 arm7_9->arm.mcr = arm926ejs_mcr;
684
685 /* initialize arm7/arm9 specific info (including armv4_5) */
686 arm9tdmi_init_arch_info(target, arm7_9, tap);
687
688 arm926ejs->common_magic = ARM926EJS_COMMON_MAGIC;
689
690 arm7_9->post_debug_entry = arm926ejs_post_debug_entry;
691 arm7_9->pre_restore_context = arm926ejs_pre_restore_context;
692 arm7_9->write_memory = arm926ejs_write_memory;
693
694 arm926ejs->read_cp15 = arm926ejs_cp15_read;
695 arm926ejs->write_cp15 = arm926ejs_cp15_write;
696 arm926ejs->armv4_5_mmu.armv4_5_cache.ctype = -1;
697 arm926ejs->armv4_5_mmu.get_ttb = arm926ejs_get_ttb;
698 arm926ejs->armv4_5_mmu.read_memory = arm7_9_read_memory;
699 arm926ejs->armv4_5_mmu.write_memory = arm7_9_write_memory;
700 arm926ejs->armv4_5_mmu.disable_mmu_caches = arm926ejs_disable_mmu_caches;
701 arm926ejs->armv4_5_mmu.enable_mmu_caches = arm926ejs_enable_mmu_caches;
702 arm926ejs->armv4_5_mmu.has_tiny_pages = 1;
703 arm926ejs->armv4_5_mmu.mmu_enabled = 0;
704
705 arm7_9->examine_debug_reason = arm926ejs_examine_debug_reason;
706
707 /* The ARM926EJ-S implements the ARMv5TE architecture which
708 * has the BKPT instruction, so we don't have to use a watchpoint comparator
709 */
710 arm7_9->arm_bkpt = ARMV5_BKPT(0x0);
711 arm7_9->thumb_bkpt = ARMV5_T_BKPT(0x0) & 0xffff;
712
713 return ERROR_OK;
714 }
715
716 static int arm926ejs_target_create(struct target *target, Jim_Interp *interp)
717 {
718 struct arm926ejs_common *arm926ejs = calloc(1, sizeof(struct arm926ejs_common));
719
720 /* ARM9EJ-S core always reports 0x1 in Capture-IR */
721 target->tap->ir_capture_mask = 0x0f;
722
723 return arm926ejs_init_arch_info(target, arm926ejs, target->tap);
724 }
725
726 COMMAND_HANDLER(arm926ejs_handle_cache_info_command)
727 {
728 int retval;
729 struct target *target = get_current_target(CMD_CTX);
730 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
731
732 retval = arm926ejs_verify_pointer(CMD_CTX, arm926ejs);
733 if (retval != ERROR_OK)
734 return retval;
735
736 return armv4_5_handle_cache_info_command(CMD_CTX, &arm926ejs->armv4_5_mmu.armv4_5_cache);
737 }
738
739 static int arm926ejs_virt2phys(struct target *target, uint32_t virtual, uint32_t *physical)
740 {
741 uint32_t cb;
742 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
743
744 uint32_t ret;
745 int retval = armv4_5_mmu_translate_va(target, &arm926ejs->armv4_5_mmu,
746 virtual, &cb, &ret);
747 if (retval != ERROR_OK)
748 return retval;
749 *physical = ret;
750 return ERROR_OK;
751 }
752
753 static int arm926ejs_mmu(struct target *target, int *enabled)
754 {
755 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
756
757 if (target->state != TARGET_HALTED) {
758 LOG_ERROR("Target not halted");
759 return ERROR_TARGET_INVALID;
760 }
761 *enabled = arm926ejs->armv4_5_mmu.mmu_enabled;
762 return ERROR_OK;
763 }
764
765 static const struct command_registration arm926ejs_exec_command_handlers[] = {
766 {
767 .name = "cache_info",
768 .handler = arm926ejs_handle_cache_info_command,
769 .mode = COMMAND_EXEC,
770 .usage = "",
771 .help = "display information about target caches",
772
773 },
774 COMMAND_REGISTRATION_DONE
775 };
776 const struct command_registration arm926ejs_command_handlers[] = {
777 {
778 .chain = arm9tdmi_command_handlers,
779 },
780 {
781 .name = "arm926ejs",
782 .mode = COMMAND_ANY,
783 .help = "arm926ejs command group",
784 .usage = "",
785 .chain = arm926ejs_exec_command_handlers,
786 },
787 COMMAND_REGISTRATION_DONE
788 };
789
790 /** Holds methods for ARM926 targets. */
791 struct target_type arm926ejs_target = {
792 .name = "arm926ejs",
793
794 .poll = arm7_9_poll,
795 .arch_state = arm926ejs_arch_state,
796
797 .target_request_data = arm7_9_target_request_data,
798
799 .halt = arm7_9_halt,
800 .resume = arm7_9_resume,
801 .step = arm7_9_step,
802
803 .assert_reset = arm7_9_assert_reset,
804 .deassert_reset = arm7_9_deassert_reset,
805 .soft_reset_halt = arm926ejs_soft_reset_halt,
806
807 .get_gdb_reg_list = arm_get_gdb_reg_list,
808
809 .read_memory = arm7_9_read_memory,
810 .write_memory = arm7_9_write_memory_opt,
811
812 .checksum_memory = arm_checksum_memory,
813 .blank_check_memory = arm_blank_check_memory,
814
815 .run_algorithm = armv4_5_run_algorithm,
816
817 .add_breakpoint = arm7_9_add_breakpoint,
818 .remove_breakpoint = arm7_9_remove_breakpoint,
819 .add_watchpoint = arm7_9_add_watchpoint,
820 .remove_watchpoint = arm7_9_remove_watchpoint,
821
822 .commands = arm926ejs_command_handlers,
823 .target_create = arm926ejs_target_create,
824 .init_target = arm9tdmi_init_target,
825 .examine = arm7_9_examine,
826 .check_reset = arm7_9_check_reset,
827 .virt2phys = arm926ejs_virt2phys,
828 .mmu = arm926ejs_mmu,
829
830 .read_phys_memory = arm926ejs_read_phys_memory,
831 .write_phys_memory = arm926ejs_write_phys_memory,
832 };
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