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arm: add error propagation to generic get_ttb fn
[openocd/cortex.git] / src / target / arm926ejs.c
blob0cf7173564b6bf6203cb8877a94af7b0e573963e
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, write to the *
20 * Free Software Foundation, Inc., *
21 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
22 ***************************************************************************/
23 #ifdef HAVE_CONFIG_H
24 #include "config.h"
25 #endif
26
27 #include "arm926ejs.h"
28 #include <helper/time_support.h>
29 #include "target_type.h"
30 #include "register.h"
31 #include "arm_opcodes.h"
32
33
34 /*
35 * The ARM926 is built around the ARM9EJ-S core, and most JTAG docs
36 * are in the ARM9EJ-S Technical Reference Manual (ARM DDI 0222B) not
37 * the ARM926 manual (ARM DDI 0198E). The scan chains are:
38 *
39 * 1 ... core debugging
40 * 2 ... EmbeddedICE
41 * 3 ... external boundary scan (SoC-specific, unused here)
42 * 6 ... ETM
43 * 15 ... coprocessor 15
44 */
45
46 #if 0
47 #define _DEBUG_INSTRUCTION_EXECUTION_
48 #endif
49
50 #define ARM926EJS_CP15_ADDR(opcode_1, opcode_2, CRn, CRm) ((opcode_1 << 11) | (opcode_2 << 8) | (CRn << 4) | (CRm << 0))
51
52 static int arm926ejs_cp15_read(struct target *target, uint32_t op1, uint32_t op2,
53 uint32_t CRn, uint32_t CRm, uint32_t *value)
54 {
55 int retval = ERROR_OK;
56 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
57 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
58 uint32_t address = ARM926EJS_CP15_ADDR(op1, op2, CRn, CRm);
59 struct scan_field fields[4];
60 uint8_t address_buf[2] = {0, 0};
61 uint8_t nr_w_buf = 0;
62 uint8_t access_t = 1;
63
64 buf_set_u32(address_buf, 0, 14, address);
65
66 if ((retval = arm_jtag_scann(jtag_info, 0xf, TAP_IDLE)) != ERROR_OK)
67 {
68 return retval;
69 }
70 arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_IDLE);
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 {
94 /* rescan with NOP, to wait for the access to complete */
95 access_t = 0;
96 nr_w_buf = 0;
97 jtag_add_dr_scan(jtag_info->tap, 4, fields, TAP_IDLE);
98
99 jtag_add_callback(arm_le_to_h_u32, (jtag_callback_data_t)value);
100
101 if ((retval = jtag_execute_queue()) != ERROR_OK)
102 {
103 return retval;
104 }
105
106 if (buf_get_u32(&access_t, 0, 1) == 1)
107 {
108 break;
109 }
110
111 /* 10ms timeout */
112 if ((timeval_ms()-then)>10)
113 {
114 LOG_ERROR("cp15 read operation timed out");
115 return ERROR_FAIL;
116 }
117 }
118
119 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
120 LOG_DEBUG("addr: 0x%x value: %8.8x", address, *value);
121 #endif
122
123 arm_jtag_set_instr(jtag_info, 0xc, NULL, TAP_IDLE);
124
125 return ERROR_OK;
126 }
127
128 static int arm926ejs_mrc(struct target *target, int cpnum, uint32_t op1,
129 uint32_t op2, uint32_t CRn, uint32_t CRm, uint32_t *value)
130 {
131 if (cpnum != 15) {
132 LOG_ERROR("Only cp15 is supported");
133 return ERROR_FAIL;
134 }
135 return arm926ejs_cp15_read(target, op1, op2, CRn, CRm, value);
136 }
137
138 static int arm926ejs_cp15_write(struct target *target, uint32_t op1, uint32_t op2,
139 uint32_t CRn, uint32_t CRm, uint32_t value)
140 {
141 int retval = ERROR_OK;
142 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
143 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
144 uint32_t address = ARM926EJS_CP15_ADDR(op1, op2, CRn, CRm);
145 struct scan_field fields[4];
146 uint8_t value_buf[4];
147 uint8_t address_buf[2] = {0, 0};
148 uint8_t nr_w_buf = 1;
149 uint8_t access_t = 1;
150
151 buf_set_u32(address_buf, 0, 14, address);
152 buf_set_u32(value_buf, 0, 32, value);
153
154 if ((retval = arm_jtag_scann(jtag_info, 0xf, TAP_IDLE)) != ERROR_OK)
155 {
156 return retval;
157 }
158 arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_IDLE);
159
160 fields[0].num_bits = 32;
161 fields[0].out_value = value_buf;
162 fields[0].in_value = NULL;
163
164 fields[1].num_bits = 1;
165 fields[1].out_value = &access_t;
166 fields[1].in_value = &access_t;
167
168 fields[2].num_bits = 14;
169 fields[2].out_value = address_buf;
170 fields[2].in_value = NULL;
171
172 fields[3].num_bits = 1;
173 fields[3].out_value = &nr_w_buf;
174 fields[3].in_value = NULL;
175
176 jtag_add_dr_scan(jtag_info->tap, 4, fields, TAP_IDLE);
177
178 long long then = timeval_ms();
179
180 for (;;)
181 {
182 /* rescan with NOP, to wait for the access to complete */
183 access_t = 0;
184 nr_w_buf = 0;
185 jtag_add_dr_scan(jtag_info->tap, 4, fields, TAP_IDLE);
186 if ((retval = jtag_execute_queue()) != ERROR_OK)
187 {
188 return retval;
189 }
190
191 if (buf_get_u32(&access_t, 0, 1) == 1)
192 {
193 break;
194 }
195
196 /* 10ms timeout */
197 if ((timeval_ms()-then)>10)
198 {
199 LOG_ERROR("cp15 write operation timed out");
200 return ERROR_FAIL;
201 }
202 }
203
204 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
205 LOG_DEBUG("addr: 0x%x value: %8.8x", address, value);
206 #endif
207
208 arm_jtag_set_instr(jtag_info, 0xf, NULL, TAP_IDLE);
209
210 return ERROR_OK;
211 }
212
213 static int arm926ejs_mcr(struct target *target, int cpnum, uint32_t op1,
214 uint32_t op2, uint32_t CRn, uint32_t CRm, uint32_t value)
215 {
216 if (cpnum != 15) {
217 LOG_ERROR("Only cp15 is supported");
218 return ERROR_FAIL;
219 }
220 return arm926ejs_cp15_write(target, op1, op2, CRn, CRm, value);
221 }
222
223 static int arm926ejs_examine_debug_reason(struct target *target)
224 {
225 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
226 struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
227 int debug_reason;
228 int retval;
229
230 embeddedice_read_reg(dbg_stat);
231 if ((retval = jtag_execute_queue()) != ERROR_OK)
232 return retval;
233
234 /* Method-Of-Entry (MOE) field */
235 debug_reason = buf_get_u32(dbg_stat->value, 6, 4);
236
237 switch (debug_reason)
238 {
239 case 0:
240 LOG_DEBUG("no *NEW* debug entry (?missed one?)");
241 /* ... since last restart or debug reset ... */
242 target->debug_reason = DBG_REASON_DBGRQ;
243 break;
244 case 1:
245 LOG_DEBUG("breakpoint from EICE unit 0");
246 target->debug_reason = DBG_REASON_BREAKPOINT;
247 break;
248 case 2:
249 LOG_DEBUG("breakpoint from EICE unit 1");
250 target->debug_reason = DBG_REASON_BREAKPOINT;
251 break;
252 case 3:
253 LOG_DEBUG("soft breakpoint (BKPT instruction)");
254 target->debug_reason = DBG_REASON_BREAKPOINT;
255 break;
256 case 4:
257 LOG_DEBUG("vector catch breakpoint");
258 target->debug_reason = DBG_REASON_BREAKPOINT;
259 break;
260 case 5:
261 LOG_DEBUG("external breakpoint");
262 target->debug_reason = DBG_REASON_BREAKPOINT;
263 break;
264 case 6:
265 LOG_DEBUG("watchpoint from EICE unit 0");
266 target->debug_reason = DBG_REASON_WATCHPOINT;
267 break;
268 case 7:
269 LOG_DEBUG("watchpoint from EICE unit 1");
270 target->debug_reason = DBG_REASON_WATCHPOINT;
271 break;
272 case 8:
273 LOG_DEBUG("external watchpoint");
274 target->debug_reason = DBG_REASON_WATCHPOINT;
275 break;
276 case 9:
277 LOG_DEBUG("internal debug request");
278 target->debug_reason = DBG_REASON_DBGRQ;
279 break;
280 case 10:
281 LOG_DEBUG("external debug request");
282 target->debug_reason = DBG_REASON_DBGRQ;
283 break;
284 case 11:
285 LOG_DEBUG("debug re-entry from system speed access");
286 /* This is normal when connecting to something that's
287 * already halted, or in some related code paths, but
288 * otherwise is surprising (and presumably wrong).
289 */
290 switch (target->debug_reason) {
291 case DBG_REASON_DBGRQ:
292 break;
293 default:
294 LOG_ERROR("unexpected -- debug re-entry");
295 /* FALLTHROUGH */
296 case DBG_REASON_UNDEFINED:
297 target->debug_reason = DBG_REASON_DBGRQ;
298 break;
299 }
300 break;
301 case 12:
302 /* FIX!!!! here be dragons!!! We need to fail here so
303 * the target will interpreted as halted but we won't
304 * try to talk to it right now... a resume + halt seems
305 * to sync things up again. Please send an email to
306 * openocd development mailing list if you have hardware
307 * to donate to look into this problem....
308 */
309 LOG_WARNING("WARNING: mystery debug reason MOE = 0xc. Try issuing a resume + halt.");
310 target->debug_reason = DBG_REASON_DBGRQ;
311 break;
312 default:
313 LOG_WARNING("WARNING: unknown debug reason: 0x%x", debug_reason);
314 /* Oh agony! should we interpret this as a halt request or
315 * that the target stopped on it's own accord?
316 */
317 target->debug_reason = DBG_REASON_DBGRQ;
318 /* if we fail here, we won't talk to the target and it will
319 * be reported to be in the halted state */
320 break;
321 }
322
323 return ERROR_OK;
324 }
325
326 static int arm926ejs_get_ttb(struct target *target, uint32_t *result)
327 {
328 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
329 int retval;
330 uint32_t ttb = 0x0;
331
332 if ((retval = arm926ejs->read_cp15(target, 0, 0, 2, 0, &ttb)) != ERROR_OK)
333 return retval;
334
335 *result = ttb;
336
337 return ERROR_OK;
338 }
339
340 static void arm926ejs_disable_mmu_caches(struct target *target, int mmu,
341 int d_u_cache, int i_cache)
342 {
343 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
344 uint32_t cp15_control;
345
346 /* read cp15 control register */
347 arm926ejs->read_cp15(target, 0, 0, 1, 0, &cp15_control);
348 jtag_execute_queue();
349
350 if (mmu)
351 {
352 /* invalidate TLB */
353 arm926ejs->write_cp15(target, 0, 0, 8, 7, 0x0);
354
355 cp15_control &= ~0x1U;
356 }
357
358 if (d_u_cache)
359 {
360 uint32_t debug_override;
361 /* read-modify-write CP15 debug override register
362 * to enable "test and clean all" */
363 arm926ejs->read_cp15(target, 0, 0, 15, 0, &debug_override);
364 debug_override |= 0x80000;
365 arm926ejs->write_cp15(target, 0, 0, 15, 0, debug_override);
366
367 /* clean and invalidate DCache */
368 arm926ejs->write_cp15(target, 0, 0, 7, 5, 0x0);
369
370 /* write CP15 debug override register
371 * to disable "test and clean all" */
372 debug_override &= ~0x80000;
373 arm926ejs->write_cp15(target, 0, 0, 15, 0, debug_override);
374
375 cp15_control &= ~0x4U;
376 }
377
378 if (i_cache)
379 {
380 /* invalidate ICache */
381 arm926ejs->write_cp15(target, 0, 0, 7, 5, 0x0);
382
383 cp15_control &= ~0x1000U;
384 }
385
386 arm926ejs->write_cp15(target, 0, 0, 1, 0, cp15_control);
387 }
388
389 static void arm926ejs_enable_mmu_caches(struct target *target, int mmu,
390 int d_u_cache, int i_cache)
391 {
392 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
393 uint32_t cp15_control;
394
395 /* read cp15 control register */
396 arm926ejs->read_cp15(target, 0, 0, 1, 0, &cp15_control);
397 jtag_execute_queue();
398
399 if (mmu)
400 cp15_control |= 0x1U;
401
402 if (d_u_cache)
403 cp15_control |= 0x4U;
404
405 if (i_cache)
406 cp15_control |= 0x1000U;
407
408 arm926ejs->write_cp15(target, 0, 0, 1, 0, cp15_control);
409 }
410
411 static void arm926ejs_post_debug_entry(struct target *target)
412 {
413 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
414
415 /* examine cp15 control reg */
416 arm926ejs->read_cp15(target, 0, 0, 1, 0, &arm926ejs->cp15_control_reg);
417 jtag_execute_queue();
418 LOG_DEBUG("cp15_control_reg: %8.8" PRIx32 "", arm926ejs->cp15_control_reg);
419
420 if (arm926ejs->armv4_5_mmu.armv4_5_cache.ctype == -1)
421 {
422 uint32_t cache_type_reg;
423 /* identify caches */
424 arm926ejs->read_cp15(target, 0, 1, 0, 0, &cache_type_reg);
425 jtag_execute_queue();
426 armv4_5_identify_cache(cache_type_reg, &arm926ejs->armv4_5_mmu.armv4_5_cache);
427 }
428
429 arm926ejs->armv4_5_mmu.mmu_enabled = (arm926ejs->cp15_control_reg & 0x1U) ? 1 : 0;
430 arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = (arm926ejs->cp15_control_reg & 0x4U) ? 1 : 0;
431 arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled = (arm926ejs->cp15_control_reg & 0x1000U) ? 1 : 0;
432
433 /* save i/d fault status and address register */
434 arm926ejs->read_cp15(target, 0, 0, 5, 0, &arm926ejs->d_fsr);
435 arm926ejs->read_cp15(target, 0, 1, 5, 0, &arm926ejs->i_fsr);
436 arm926ejs->read_cp15(target, 0, 0, 6, 0, &arm926ejs->d_far);
437
438 LOG_DEBUG("D FSR: 0x%8.8" PRIx32 ", D FAR: 0x%8.8" PRIx32 ", I FSR: 0x%8.8" PRIx32 "",
439 arm926ejs->d_fsr, arm926ejs->d_far, arm926ejs->i_fsr);
440
441 uint32_t cache_dbg_ctrl;
442
443 /* read-modify-write CP15 cache debug control register
444 * to disable I/D-cache linefills and force WT */
445 arm926ejs->read_cp15(target, 7, 0, 15, 0, &cache_dbg_ctrl);
446 cache_dbg_ctrl |= 0x7;
447 arm926ejs->write_cp15(target, 7, 0, 15, 0, cache_dbg_ctrl);
448 }
449
450 static void arm926ejs_pre_restore_context(struct target *target)
451 {
452 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
453
454 /* restore i/d fault status and address register */
455 arm926ejs->write_cp15(target, 0, 0, 5, 0, arm926ejs->d_fsr);
456 arm926ejs->write_cp15(target, 0, 1, 5, 0, arm926ejs->i_fsr);
457 arm926ejs->write_cp15(target, 0, 0, 6, 0, arm926ejs->d_far);
458
459 uint32_t cache_dbg_ctrl;
460
461 /* read-modify-write CP15 cache debug control register
462 * to reenable I/D-cache linefills and disable WT */
463 arm926ejs->read_cp15(target, 7, 0, 15, 0, &cache_dbg_ctrl);
464 cache_dbg_ctrl &= ~0x7;
465 arm926ejs->write_cp15(target, 7, 0, 15, 0, cache_dbg_ctrl);
466 }
467
468 static const char arm926_not[] = "target is not an ARM926";
469
470 static int arm926ejs_verify_pointer(struct command_context *cmd_ctx,
471 struct arm926ejs_common *arm926)
472 {
473 if (arm926->common_magic != ARM926EJS_COMMON_MAGIC) {
474 command_print(cmd_ctx, arm926_not);
475 return ERROR_TARGET_INVALID;
476 }
477 return ERROR_OK;
478 }
479
480 /** Logs summary of ARM926 state for a halted target. */
481 int arm926ejs_arch_state(struct target *target)
482 {
483 static const char *state[] =
484 {
485 "disabled", "enabled"
486 };
487
488 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
489 struct arm *armv4_5;
490
491 if (arm926ejs->common_magic != ARM926EJS_COMMON_MAGIC)
492 {
493 LOG_ERROR("BUG: %s", arm926_not);
494 return ERROR_TARGET_INVALID;
495 }
496
497 armv4_5 = &arm926ejs->arm7_9_common.armv4_5_common;
498
499 arm_arch_state(target);
500 LOG_USER("MMU: %s, D-Cache: %s, I-Cache: %s",
501 state[arm926ejs->armv4_5_mmu.mmu_enabled],
502 state[arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled],
503 state[arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled]);
504
505 return ERROR_OK;
506 }
507
508 int arm926ejs_soft_reset_halt(struct target *target)
509 {
510 int retval = ERROR_OK;
511 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
512 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
513 struct arm *armv4_5 = &arm7_9->armv4_5_common;
514 struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
515
516 if ((retval = target_halt(target)) != ERROR_OK)
517 {
518 return retval;
519 }
520
521 long long then = timeval_ms();
522 int timeout;
523 while (!(timeout = ((timeval_ms()-then) > 1000)))
524 {
525 if (buf_get_u32(dbg_stat->value, EICE_DBG_STATUS_DBGACK, 1) == 0)
526 {
527 embeddedice_read_reg(dbg_stat);
528 if ((retval = jtag_execute_queue()) != ERROR_OK)
529 {
530 return retval;
531 }
532 } else
533 {
534 break;
535 }
536 if (debug_level >= 1)
537 {
538 /* do not eat all CPU, time out after 1 se*/
539 alive_sleep(100);
540 } else
541 {
542 keep_alive();
543 }
544 }
545 if (timeout)
546 {
547 LOG_ERROR("Failed to halt CPU after 1 sec");
548 return ERROR_TARGET_TIMEOUT;
549 }
550
551 target->state = TARGET_HALTED;
552
553 /* SVC, ARM state, IRQ and FIQ disabled */
554 uint32_t cpsr;
555
556 cpsr = buf_get_u32(armv4_5->cpsr->value, 0, 32);
557 cpsr &= ~0xff;
558 cpsr |= 0xd3;
559 arm_set_cpsr(armv4_5, cpsr);
560 armv4_5->cpsr->dirty = 1;
561
562 /* start fetching from 0x0 */
563 buf_set_u32(armv4_5->pc->value, 0, 32, 0x0);
564 armv4_5->pc->dirty = 1;
565 armv4_5->pc->valid = 1;
566
567 arm926ejs_disable_mmu_caches(target, 1, 1, 1);
568 arm926ejs->armv4_5_mmu.mmu_enabled = 0;
569 arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled = 0;
570 arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled = 0;
571
572 return target_call_event_callbacks(target, TARGET_EVENT_HALTED);
573 }
574
575 /** Writes a buffer, in the specified word size, with current MMU settings. */
576 int arm926ejs_write_memory(struct target *target, uint32_t address,
577 uint32_t size, uint32_t count, uint8_t *buffer)
578 {
579 int retval;
580 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
581
582 /* FIX!!!! this should be cleaned up and made much more general. The
583 * plan is to write up and test on arm926ejs specifically and
584 * then generalize and clean up afterwards.
585 *
586 *
587 * Also it should be moved to the callbacks that handle breakpoints
588 * specifically and not the generic memory write fn's. See XScale code.
589 **/
590 if (arm926ejs->armv4_5_mmu.mmu_enabled && (count == 1) && ((size==2) || (size==4)))
591 {
592 /* special case the handling of single word writes to bypass MMU
593 * to allow implementation of breakpoints in memory marked read only
594 * by MMU */
595 if (arm926ejs->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled)
596 {
597 /* flush and invalidate data cache
598 *
599 * MCR p15,0,p,c7,c10,1 - clean cache line using virtual address
600 *
601 */
602 retval = arm926ejs->write_cp15(target, 0, 1, 7, 10, address&~0x3);
603 if (retval != ERROR_OK)
604 return retval;
605 }
606
607 uint32_t pa;
608 retval = target->type->virt2phys(target, address, &pa);
609 if (retval != ERROR_OK)
610 return retval;
611
612 /* write directly to physical memory bypassing any read only MMU bits, etc. */
613 retval = armv4_5_mmu_write_physical(target, &arm926ejs->armv4_5_mmu, pa, size, count, buffer);
614 if (retval != ERROR_OK)
615 return retval;
616 } else
617 {
618 if ((retval = arm7_9_write_memory(target, address, size, count, buffer)) != ERROR_OK)
619 return retval;
620 }
621
622 /* If ICache is enabled, we have to invalidate affected ICache lines
623 * the DCache is forced to write-through, so we don't have to clean it here
624 */
625 if (arm926ejs->armv4_5_mmu.armv4_5_cache.i_cache_enabled)
626 {
627 if (count <= 1)
628 {
629 /* invalidate ICache single entry with MVA */
630 arm926ejs->write_cp15(target, 0, 1, 7, 5, address);
631 }
632 else
633 {
634 /* invalidate ICache */
635 arm926ejs->write_cp15(target, 0, 0, 7, 5, address);
636 }
637 }
638
639 return retval;
640 }
641
642 static int arm926ejs_write_phys_memory(struct target *target,
643 uint32_t address, uint32_t size,
644 uint32_t count, uint8_t *buffer)
645 {
646 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
647
648 return armv4_5_mmu_write_physical(target, &arm926ejs->armv4_5_mmu,
649 address, size, count, buffer);
650 }
651
652 static int arm926ejs_read_phys_memory(struct target *target,
653 uint32_t address, uint32_t size,
654 uint32_t count, uint8_t *buffer)
655 {
656 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
657
658 return armv4_5_mmu_read_physical(target, &arm926ejs->armv4_5_mmu,
659 address, size, count, buffer);
660 }
661
662 int arm926ejs_init_arch_info(struct target *target, struct arm926ejs_common *arm926ejs,
663 struct jtag_tap *tap)
664 {
665 struct arm7_9_common *arm7_9 = &arm926ejs->arm7_9_common;
666
667 arm7_9->armv4_5_common.mrc = arm926ejs_mrc;
668 arm7_9->armv4_5_common.mcr = arm926ejs_mcr;
669
670 /* initialize arm7/arm9 specific info (including armv4_5) */
671 arm9tdmi_init_arch_info(target, arm7_9, tap);
672
673 arm926ejs->common_magic = ARM926EJS_COMMON_MAGIC;
674
675 arm7_9->post_debug_entry = arm926ejs_post_debug_entry;
676 arm7_9->pre_restore_context = arm926ejs_pre_restore_context;
677
678 arm926ejs->read_cp15 = arm926ejs_cp15_read;
679 arm926ejs->write_cp15 = arm926ejs_cp15_write;
680 arm926ejs->armv4_5_mmu.armv4_5_cache.ctype = -1;
681 arm926ejs->armv4_5_mmu.get_ttb = arm926ejs_get_ttb;
682 arm926ejs->armv4_5_mmu.read_memory = arm7_9_read_memory;
683 arm926ejs->armv4_5_mmu.write_memory = arm7_9_write_memory;
684 arm926ejs->armv4_5_mmu.disable_mmu_caches = arm926ejs_disable_mmu_caches;
685 arm926ejs->armv4_5_mmu.enable_mmu_caches = arm926ejs_enable_mmu_caches;
686 arm926ejs->armv4_5_mmu.has_tiny_pages = 1;
687 arm926ejs->armv4_5_mmu.mmu_enabled = 0;
688
689 arm7_9->examine_debug_reason = arm926ejs_examine_debug_reason;
690
691 /* The ARM926EJ-S implements the ARMv5TE architecture which
692 * has the BKPT instruction, so we don't have to use a watchpoint comparator
693 */
694 arm7_9->arm_bkpt = ARMV5_BKPT(0x0);
695 arm7_9->thumb_bkpt = ARMV5_T_BKPT(0x0) & 0xffff;
696
697 return ERROR_OK;
698 }
699
700 static int arm926ejs_target_create(struct target *target, Jim_Interp *interp)
701 {
702 struct arm926ejs_common *arm926ejs = calloc(1,sizeof(struct arm926ejs_common));
703
704 /* ARM9EJ-S core always reports 0x1 in Capture-IR */
705 target->tap->ir_capture_mask = 0x0f;
706
707 return arm926ejs_init_arch_info(target, arm926ejs, target->tap);
708 }
709
710 COMMAND_HANDLER(arm926ejs_handle_cache_info_command)
711 {
712 int retval;
713 struct target *target = get_current_target(CMD_CTX);
714 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
715
716 retval = arm926ejs_verify_pointer(CMD_CTX, arm926ejs);
717 if (retval != ERROR_OK)
718 return retval;
719
720 return armv4_5_handle_cache_info_command(CMD_CTX, &arm926ejs->armv4_5_mmu.armv4_5_cache);
721 }
722
723 static int arm926ejs_virt2phys(struct target *target, uint32_t virtual, uint32_t *physical)
724 {
725 uint32_t cb;
726 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
727
728 uint32_t ret;
729 int retval = armv4_5_mmu_translate_va(target, &arm926ejs->armv4_5_mmu,
730 virtual, &cb, &ret);
731 if (retval != ERROR_OK)
732 return retval;
733 *physical = ret;
734 return ERROR_OK;
735 }
736
737 static int arm926ejs_mmu(struct target *target, int *enabled)
738 {
739 struct arm926ejs_common *arm926ejs = target_to_arm926(target);
740
741 if (target->state != TARGET_HALTED)
742 {
743 LOG_ERROR("Target not halted");
744 return ERROR_TARGET_INVALID;
745 }
746 *enabled = arm926ejs->armv4_5_mmu.mmu_enabled;
747 return ERROR_OK;
748 }
749
750 static const struct command_registration arm926ejs_exec_command_handlers[] = {
751 {
752 .name = "cache_info",
753 .handler = arm926ejs_handle_cache_info_command,
754 .mode = COMMAND_EXEC,
755 .help = "display information about target caches",
756
757 },
758 COMMAND_REGISTRATION_DONE
759 };
760 const struct command_registration arm926ejs_command_handlers[] = {
761 {
762 .chain = arm9tdmi_command_handlers,
763 },
764 {
765 .name = "arm926ejs",
766 .mode = COMMAND_ANY,
767 .help = "arm926ejs command group",
768 .chain = arm926ejs_exec_command_handlers,
769 },
770 COMMAND_REGISTRATION_DONE
771 };
772
773 /** Holds methods for ARM926 targets. */
774 struct target_type arm926ejs_target =
775 {
776 .name = "arm926ejs",
777
778 .poll = arm7_9_poll,
779 .arch_state = arm926ejs_arch_state,
780
781 .target_request_data = arm7_9_target_request_data,
782
783 .halt = arm7_9_halt,
784 .resume = arm7_9_resume,
785 .step = arm7_9_step,
786
787 .assert_reset = arm7_9_assert_reset,
788 .deassert_reset = arm7_9_deassert_reset,
789 .soft_reset_halt = arm926ejs_soft_reset_halt,
790
791 .get_gdb_reg_list = arm_get_gdb_reg_list,
792
793 .read_memory = arm7_9_read_memory,
794 .write_memory = arm926ejs_write_memory,
795 .bulk_write_memory = arm7_9_bulk_write_memory,
796
797 .checksum_memory = arm_checksum_memory,
798 .blank_check_memory = arm_blank_check_memory,
799
800 .run_algorithm = armv4_5_run_algorithm,
801
802 .add_breakpoint = arm7_9_add_breakpoint,
803 .remove_breakpoint = arm7_9_remove_breakpoint,
804 .add_watchpoint = arm7_9_add_watchpoint,
805 .remove_watchpoint = arm7_9_remove_watchpoint,
806
807 .commands = arm926ejs_command_handlers,
808 .target_create = arm926ejs_target_create,
809 .init_target = arm9tdmi_init_target,
810 .examine = arm7_9_examine,
811 .check_reset = arm7_9_check_reset,
812 .virt2phys = arm926ejs_virt2phys,
813 .mmu = arm926ejs_mmu,
814
815 .read_phys_memory = arm926ejs_read_phys_memory,
816 .write_phys_memory = arm926ejs_write_phys_memory,
817 };
Marex's Cortex A8 development branch