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debug: debug entry error propagation
[openocd/cortex.git] / src / target / cortex_a8.c
blob9b3521ac5115f7dad9977886551e1834b84c4172
1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * Copyright (C) 2006 by Magnus Lundin *
6 * lundin@mlu.mine.nu *
7 * *
8 * Copyright (C) 2008 by Spencer Oliver *
9 * spen@spen-soft.co.uk *
10 * *
11 * Copyright (C) 2009 by Dirk Behme *
12 * dirk.behme@gmail.com - copy from cortex_m3 *
13 * *
14 * Copyright (C) 2010 Øyvind Harboe *
15 * oyvind.harboe@zylin.com *
16 * *
17 * This program is free software; you can redistribute it and/or modify *
18 * it under the terms of the GNU General Public License as published by *
19 * the Free Software Foundation; either version 2 of the License, or *
20 * (at your option) any later version. *
21 * *
22 * This program is distributed in the hope that it will be useful, *
23 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
24 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
25 * GNU General Public License for more details. *
26 * *
27 * You should have received a copy of the GNU General Public License *
28 * along with this program; if not, write to the *
29 * Free Software Foundation, Inc., *
30 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
31 * *
32 * Cortex-A8(tm) TRM, ARM DDI 0344H *
33 * *
34 ***************************************************************************/
35 #ifdef HAVE_CONFIG_H
36 #include "config.h"
37 #endif
38
39 #include "breakpoints.h"
40 #include "cortex_a8.h"
41 #include "register.h"
42 #include "target_request.h"
43 #include "target_type.h"
44 #include "arm_opcodes.h"
45 #include <helper/time_support.h>
46
47 static int cortex_a8_poll(struct target *target);
48 static int cortex_a8_debug_entry(struct target *target);
49 static int cortex_a8_restore_context(struct target *target, bool bpwp);
50 static int cortex_a8_set_breakpoint(struct target *target,
51 struct breakpoint *breakpoint, uint8_t matchmode);
52 static int cortex_a8_unset_breakpoint(struct target *target,
53 struct breakpoint *breakpoint);
54 static int cortex_a8_dap_read_coreregister_u32(struct target *target,
55 uint32_t *value, int regnum);
56 static int cortex_a8_dap_write_coreregister_u32(struct target *target,
57 uint32_t value, int regnum);
58 static int cortex_a8_mmu(struct target *target, int *enabled);
59 static int cortex_a8_virt2phys(struct target *target,
60 uint32_t virt, uint32_t *phys);
61 static int cortex_a8_disable_mmu_caches(struct target *target, int mmu,
62 int d_u_cache, int i_cache);
63 static int cortex_a8_enable_mmu_caches(struct target *target, int mmu,
64 int d_u_cache, int i_cache);
65 static int cortex_a8_get_ttb(struct target *target, uint32_t *result);
66
67
68 /*
69 * FIXME do topology discovery using the ROM; don't
70 * assume this is an OMAP3. Also, allow for multiple ARMv7-A
71 * cores, with different AP numbering ... don't use a #define
72 * for these numbers, use per-core armv7a state.
73 */
74 #define swjdp_memoryap 0
75 #define swjdp_debugap 1
76 #define OMAP3530_DEBUG_BASE 0x54011000
77
78 /*
79 * Cortex-A8 Basic debug access, very low level assumes state is saved
80 */
81 static int cortex_a8_init_debug_access(struct target *target)
82 {
83 struct armv7a_common *armv7a = target_to_armv7a(target);
84 struct adiv5_dap *swjdp = &armv7a->dap;
85
86 int retval;
87 uint32_t dummy;
88
89 LOG_DEBUG(" ");
90
91 /* Unlocking the debug registers for modification */
92 /* The debugport might be uninitialised so try twice */
93 retval = mem_ap_write_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_LOCKACCESS, 0xC5ACCE55);
94 if (retval != ERROR_OK)
95 {
96 /* try again */
97 retval = mem_ap_write_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_LOCKACCESS, 0xC5ACCE55);
98 if (retval == ERROR_OK)
99 {
100 LOG_USER("Locking debug access failed on first, but succeeded on second try.");
101 }
102 }
103 if (retval != ERROR_OK)
104 return retval;
105 /* Clear Sticky Power Down status Bit in PRSR to enable access to
106 the registers in the Core Power Domain */
107 retval = mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_PRSR, &dummy);
108 if (retval != ERROR_OK)
109 return retval;
110
111 /* Enabling of instruction execution in debug mode is done in debug_entry code */
112
113 /* Resync breakpoint registers */
114
115 /* Since this is likely called from init or reset, update target state information*/
116 retval = cortex_a8_poll(target);
117
118 return retval;
119 }
120
121 /* To reduce needless round-trips, pass in a pointer to the current
122 * DSCR value. Initialize it to zero if you just need to know the
123 * value on return from this function; or DSCR_INSTR_COMP if you
124 * happen to know that no instruction is pending.
125 */
126 static int cortex_a8_exec_opcode(struct target *target,
127 uint32_t opcode, uint32_t *dscr_p)
128 {
129 uint32_t dscr;
130 int retval;
131 struct armv7a_common *armv7a = target_to_armv7a(target);
132 struct adiv5_dap *swjdp = &armv7a->dap;
133
134 dscr = dscr_p ? *dscr_p : 0;
135
136 LOG_DEBUG("exec opcode 0x%08" PRIx32, opcode);
137
138 /* Wait for InstrCompl bit to be set */
139 long long then = timeval_ms();
140 while ((dscr & DSCR_INSTR_COMP) == 0)
141 {
142 retval = mem_ap_read_atomic_u32(swjdp,
143 armv7a->debug_base + CPUDBG_DSCR, &dscr);
144 if (retval != ERROR_OK)
145 {
146 LOG_ERROR("Could not read DSCR register, opcode = 0x%08" PRIx32, opcode);
147 return retval;
148 }
149 if (timeval_ms() > then + 1000)
150 {
151 LOG_ERROR("Timeout waiting for cortex_a8_exec_opcode");
152 return ERROR_FAIL;
153 }
154 }
155
156 retval = mem_ap_write_u32(swjdp, armv7a->debug_base + CPUDBG_ITR, opcode);
157 if (retval != ERROR_OK)
158 return retval;
159
160 then = timeval_ms();
161 do
162 {
163 retval = mem_ap_read_atomic_u32(swjdp,
164 armv7a->debug_base + CPUDBG_DSCR, &dscr);
165 if (retval != ERROR_OK)
166 {
167 LOG_ERROR("Could not read DSCR register");
168 return retval;
169 }
170 if (timeval_ms() > then + 1000)
171 {
172 LOG_ERROR("Timeout waiting for cortex_a8_exec_opcode");
173 return ERROR_FAIL;
174 }
175 }
176 while ((dscr & DSCR_INSTR_COMP) == 0); /* Wait for InstrCompl bit to be set */
177
178 if (dscr_p)
179 *dscr_p = dscr;
180
181 return retval;
182 }
183
184 /**************************************************************************
185 Read core register with very few exec_opcode, fast but needs work_area.
186 This can cause problems with MMU active.
187 **************************************************************************/
188 static int cortex_a8_read_regs_through_mem(struct target *target, uint32_t address,
189 uint32_t * regfile)
190 {
191 int retval = ERROR_OK;
192 struct armv7a_common *armv7a = target_to_armv7a(target);
193 struct adiv5_dap *swjdp = &armv7a->dap;
194
195 retval = cortex_a8_dap_read_coreregister_u32(target, regfile, 0);
196 if (retval != ERROR_OK)
197 return retval;
198 retval = cortex_a8_dap_write_coreregister_u32(target, address, 0);
199 if (retval != ERROR_OK)
200 return retval;
201 retval = cortex_a8_exec_opcode(target, ARMV4_5_STMIA(0, 0xFFFE, 0, 0), NULL);
202 if (retval != ERROR_OK)
203 return retval;
204
205 dap_ap_select(swjdp, swjdp_memoryap);
206 retval = mem_ap_read_buf_u32(swjdp, (uint8_t *)(&regfile[1]), 4*15, address);
207 if (retval != ERROR_OK)
208 return retval;
209 dap_ap_select(swjdp, swjdp_debugap);
210
211 return retval;
212 }
213
214 static int cortex_a8_dap_read_coreregister_u32(struct target *target,
215 uint32_t *value, int regnum)
216 {
217 int retval = ERROR_OK;
218 uint8_t reg = regnum&0xFF;
219 uint32_t dscr = 0;
220 struct armv7a_common *armv7a = target_to_armv7a(target);
221 struct adiv5_dap *swjdp = &armv7a->dap;
222
223 if (reg > 17)
224 return retval;
225
226 if (reg < 15)
227 {
228 /* Rn to DCCTX, "MCR p14, 0, Rn, c0, c5, 0" 0xEE00nE15 */
229 retval = cortex_a8_exec_opcode(target,
230 ARMV4_5_MCR(14, 0, reg, 0, 5, 0),
231 &dscr);
232 if (retval != ERROR_OK)
233 return retval;
234 }
235 else if (reg == 15)
236 {
237 /* "MOV r0, r15"; then move r0 to DCCTX */
238 retval = cortex_a8_exec_opcode(target, 0xE1A0000F, &dscr);
239 if (retval != ERROR_OK)
240 return retval;
241 retval = cortex_a8_exec_opcode(target,
242 ARMV4_5_MCR(14, 0, 0, 0, 5, 0),
243 &dscr);
244 if (retval != ERROR_OK)
245 return retval;
246 }
247 else
248 {
249 /* "MRS r0, CPSR" or "MRS r0, SPSR"
250 * then move r0 to DCCTX
251 */
252 retval = cortex_a8_exec_opcode(target, ARMV4_5_MRS(0, reg & 1), &dscr);
253 if (retval != ERROR_OK)
254 return retval;
255 retval = cortex_a8_exec_opcode(target,
256 ARMV4_5_MCR(14, 0, 0, 0, 5, 0),
257 &dscr);
258 if (retval != ERROR_OK)
259 return retval;
260 }
261
262 /* Wait for DTRRXfull then read DTRRTX */
263 long long then = timeval_ms();
264 while ((dscr & DSCR_DTR_TX_FULL) == 0)
265 {
266 retval = mem_ap_read_atomic_u32(swjdp,
267 armv7a->debug_base + CPUDBG_DSCR, &dscr);
268 if (retval != ERROR_OK)
269 return retval;
270 if (timeval_ms() > then + 1000)
271 {
272 LOG_ERROR("Timeout waiting for cortex_a8_exec_opcode");
273 return ERROR_FAIL;
274 }
275 }
276
277 retval = mem_ap_read_atomic_u32(swjdp,
278 armv7a->debug_base + CPUDBG_DTRTX, value);
279 LOG_DEBUG("read DCC 0x%08" PRIx32, *value);
280
281 return retval;
282 }
283
284 static int cortex_a8_dap_write_coreregister_u32(struct target *target,
285 uint32_t value, int regnum)
286 {
287 int retval = ERROR_OK;
288 uint8_t Rd = regnum&0xFF;
289 uint32_t dscr;
290 struct armv7a_common *armv7a = target_to_armv7a(target);
291 struct adiv5_dap *swjdp = &armv7a->dap;
292
293 LOG_DEBUG("register %i, value 0x%08" PRIx32, regnum, value);
294
295 /* Check that DCCRX is not full */
296 retval = mem_ap_read_atomic_u32(swjdp,
297 armv7a->debug_base + CPUDBG_DSCR, &dscr);
298 if (retval != ERROR_OK)
299 return retval;
300 if (dscr & DSCR_DTR_RX_FULL)
301 {
302 LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr);
303 /* Clear DCCRX with MCR(p14, 0, Rd, c0, c5, 0), opcode 0xEE000E15 */
304 retval = cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
305 &dscr);
306 if (retval != ERROR_OK)
307 return retval;
308 }
309
310 if (Rd > 17)
311 return retval;
312
313 /* Write DTRRX ... sets DSCR.DTRRXfull but exec_opcode() won't care */
314 LOG_DEBUG("write DCC 0x%08" PRIx32, value);
315 retval = mem_ap_write_u32(swjdp,
316 armv7a->debug_base + CPUDBG_DTRRX, value);
317 if (retval != ERROR_OK)
318 return retval;
319
320 if (Rd < 15)
321 {
322 /* DCCRX to Rn, "MCR p14, 0, Rn, c0, c5, 0", 0xEE00nE15 */
323 retval = cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, Rd, 0, 5, 0),
324 &dscr);
325 if (retval != ERROR_OK)
326 return retval;
327 }
328 else if (Rd == 15)
329 {
330 /* DCCRX to R0, "MCR p14, 0, R0, c0, c5, 0", 0xEE000E15
331 * then "mov r15, r0"
332 */
333 retval = cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
334 &dscr);
335 if (retval != ERROR_OK)
336 return retval;
337 retval = cortex_a8_exec_opcode(target, 0xE1A0F000, &dscr);
338 if (retval != ERROR_OK)
339 return retval;
340 }
341 else
342 {
343 /* DCCRX to R0, "MCR p14, 0, R0, c0, c5, 0", 0xEE000E15
344 * then "MSR CPSR_cxsf, r0" or "MSR SPSR_cxsf, r0" (all fields)
345 */
346 retval = cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
347 &dscr);
348 if (retval != ERROR_OK)
349 return retval;
350 retval = cortex_a8_exec_opcode(target, ARMV4_5_MSR_GP(0, 0xF, Rd & 1),
351 &dscr);
352 if (retval != ERROR_OK)
353 return retval;
354
355 /* "Prefetch flush" after modifying execution status in CPSR */
356 if (Rd == 16)
357 {
358 retval = cortex_a8_exec_opcode(target,
359 ARMV4_5_MCR(15, 0, 0, 7, 5, 4),
360 &dscr);
361 if (retval != ERROR_OK)
362 return retval;
363 }
364 }
365
366 return retval;
367 }
368
369 /* Write to memory mapped registers directly with no cache or mmu handling */
370 static int cortex_a8_dap_write_memap_register_u32(struct target *target, uint32_t address, uint32_t value)
371 {
372 int retval;
373 struct armv7a_common *armv7a = target_to_armv7a(target);
374 struct adiv5_dap *swjdp = &armv7a->dap;
375
376 retval = mem_ap_write_atomic_u32(swjdp, address, value);
377
378 return retval;
379 }
380
381 /*
382 * Cortex-A8 implementation of Debug Programmer's Model
383 *
384 * NOTE the invariant: these routines return with DSCR_INSTR_COMP set,
385 * so there's no need to poll for it before executing an instruction.
386 *
387 * NOTE that in several of these cases the "stall" mode might be useful.
388 * It'd let us queue a few operations together... prepare/finish might
389 * be the places to enable/disable that mode.
390 */
391
392 static inline struct cortex_a8_common *dpm_to_a8(struct arm_dpm *dpm)
393 {
394 return container_of(dpm, struct cortex_a8_common, armv7a_common.dpm);
395 }
396
397 static int cortex_a8_write_dcc(struct cortex_a8_common *a8, uint32_t data)
398 {
399 LOG_DEBUG("write DCC 0x%08" PRIx32, data);
400 return mem_ap_write_u32(&a8->armv7a_common.dap,
401 a8->armv7a_common.debug_base + CPUDBG_DTRRX, data);
402 }
403
404 static int cortex_a8_read_dcc(struct cortex_a8_common *a8, uint32_t *data,
405 uint32_t *dscr_p)
406 {
407 struct adiv5_dap *swjdp = &a8->armv7a_common.dap;
408 uint32_t dscr = DSCR_INSTR_COMP;
409 int retval;
410
411 if (dscr_p)
412 dscr = *dscr_p;
413
414 /* Wait for DTRRXfull */
415 long long then = timeval_ms();
416 while ((dscr & DSCR_DTR_TX_FULL) == 0) {
417 retval = mem_ap_read_atomic_u32(swjdp,
418 a8->armv7a_common.debug_base + CPUDBG_DSCR,
419 &dscr);
420 if (retval != ERROR_OK)
421 return retval;
422 if (timeval_ms() > then + 1000)
423 {
424 LOG_ERROR("Timeout waiting for read dcc");
425 return ERROR_FAIL;
426 }
427 }
428
429 retval = mem_ap_read_atomic_u32(swjdp,
430 a8->armv7a_common.debug_base + CPUDBG_DTRTX, data);
431 if (retval != ERROR_OK)
432 return retval;
433 //LOG_DEBUG("read DCC 0x%08" PRIx32, *data);
434
435 if (dscr_p)
436 *dscr_p = dscr;
437
438 return retval;
439 }
440
441 static int cortex_a8_dpm_prepare(struct arm_dpm *dpm)
442 {
443 struct cortex_a8_common *a8 = dpm_to_a8(dpm);
444 struct adiv5_dap *swjdp = &a8->armv7a_common.dap;
445 uint32_t dscr;
446 int retval;
447
448 /* set up invariant: INSTR_COMP is set after ever DPM operation */
449 long long then = timeval_ms();
450 for (;;)
451 {
452 retval = mem_ap_read_atomic_u32(swjdp,
453 a8->armv7a_common.debug_base + CPUDBG_DSCR,
454 &dscr);
455 if (retval != ERROR_OK)
456 return retval;
457 if ((dscr & DSCR_INSTR_COMP) != 0)
458 break;
459 if (timeval_ms() > then + 1000)
460 {
461 LOG_ERROR("Timeout waiting for dpm prepare");
462 return ERROR_FAIL;
463 }
464 }
465
466 /* this "should never happen" ... */
467 if (dscr & DSCR_DTR_RX_FULL) {
468 LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr);
469 /* Clear DCCRX */
470 retval = cortex_a8_exec_opcode(
471 a8->armv7a_common.armv4_5_common.target,
472 ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
473 &dscr);
474 if (retval != ERROR_OK)
475 return retval;
476 }
477
478 return retval;
479 }
480
481 static int cortex_a8_dpm_finish(struct arm_dpm *dpm)
482 {
483 /* REVISIT what could be done here? */
484 return ERROR_OK;
485 }
486
487 static int cortex_a8_instr_write_data_dcc(struct arm_dpm *dpm,
488 uint32_t opcode, uint32_t data)
489 {
490 struct cortex_a8_common *a8 = dpm_to_a8(dpm);
491 int retval;
492 uint32_t dscr = DSCR_INSTR_COMP;
493
494 retval = cortex_a8_write_dcc(a8, data);
495 if (retval != ERROR_OK)
496 return retval;
497
498 return cortex_a8_exec_opcode(
499 a8->armv7a_common.armv4_5_common.target,
500 opcode,
501 &dscr);
502 }
503
504 static int cortex_a8_instr_write_data_r0(struct arm_dpm *dpm,
505 uint32_t opcode, uint32_t data)
506 {
507 struct cortex_a8_common *a8 = dpm_to_a8(dpm);
508 uint32_t dscr = DSCR_INSTR_COMP;
509 int retval;
510
511 retval = cortex_a8_write_dcc(a8, data);
512 if (retval != ERROR_OK)
513 return retval;
514
515 /* DCCRX to R0, "MCR p14, 0, R0, c0, c5, 0", 0xEE000E15 */
516 retval = cortex_a8_exec_opcode(
517 a8->armv7a_common.armv4_5_common.target,
518 ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
519 &dscr);
520 if (retval != ERROR_OK)
521 return retval;
522
523 /* then the opcode, taking data from R0 */
524 retval = cortex_a8_exec_opcode(
525 a8->armv7a_common.armv4_5_common.target,
526 opcode,
527 &dscr);
528
529 return retval;
530 }
531
532 static int cortex_a8_instr_cpsr_sync(struct arm_dpm *dpm)
533 {
534 struct target *target = dpm->arm->target;
535 uint32_t dscr = DSCR_INSTR_COMP;
536
537 /* "Prefetch flush" after modifying execution status in CPSR */
538 return cortex_a8_exec_opcode(target,
539 ARMV4_5_MCR(15, 0, 0, 7, 5, 4),
540 &dscr);
541 }
542
543 static int cortex_a8_instr_read_data_dcc(struct arm_dpm *dpm,
544 uint32_t opcode, uint32_t *data)
545 {
546 struct cortex_a8_common *a8 = dpm_to_a8(dpm);
547 int retval;
548 uint32_t dscr = DSCR_INSTR_COMP;
549
550 /* the opcode, writing data to DCC */
551 retval = cortex_a8_exec_opcode(
552 a8->armv7a_common.armv4_5_common.target,
553 opcode,
554 &dscr);
555 if (retval != ERROR_OK)
556 return retval;
557
558 return cortex_a8_read_dcc(a8, data, &dscr);
559 }
560
561
562 static int cortex_a8_instr_read_data_r0(struct arm_dpm *dpm,
563 uint32_t opcode, uint32_t *data)
564 {
565 struct cortex_a8_common *a8 = dpm_to_a8(dpm);
566 uint32_t dscr = DSCR_INSTR_COMP;
567 int retval;
568
569 /* the opcode, writing data to R0 */
570 retval = cortex_a8_exec_opcode(
571 a8->armv7a_common.armv4_5_common.target,
572 opcode,
573 &dscr);
574 if (retval != ERROR_OK)
575 return retval;
576
577 /* write R0 to DCC */
578 retval = cortex_a8_exec_opcode(
579 a8->armv7a_common.armv4_5_common.target,
580 ARMV4_5_MCR(14, 0, 0, 0, 5, 0),
581 &dscr);
582 if (retval != ERROR_OK)
583 return retval;
584
585 return cortex_a8_read_dcc(a8, data, &dscr);
586 }
587
588 static int cortex_a8_bpwp_enable(struct arm_dpm *dpm, unsigned index_t,
589 uint32_t addr, uint32_t control)
590 {
591 struct cortex_a8_common *a8 = dpm_to_a8(dpm);
592 uint32_t vr = a8->armv7a_common.debug_base;
593 uint32_t cr = a8->armv7a_common.debug_base;
594 int retval;
595
596 switch (index_t) {
597 case 0 ... 15: /* breakpoints */
598 vr += CPUDBG_BVR_BASE;
599 cr += CPUDBG_BCR_BASE;
600 break;
601 case 16 ... 31: /* watchpoints */
602 vr += CPUDBG_WVR_BASE;
603 cr += CPUDBG_WCR_BASE;
604 index_t -= 16;
605 break;
606 default:
607 return ERROR_FAIL;
608 }
609 vr += 4 * index_t;
610 cr += 4 * index_t;
611
612 LOG_DEBUG("A8: bpwp enable, vr %08x cr %08x",
613 (unsigned) vr, (unsigned) cr);
614
615 retval = cortex_a8_dap_write_memap_register_u32(dpm->arm->target,
616 vr, addr);
617 if (retval != ERROR_OK)
618 return retval;
619 retval = cortex_a8_dap_write_memap_register_u32(dpm->arm->target,
620 cr, control);
621 return retval;
622 }
623
624 static int cortex_a8_bpwp_disable(struct arm_dpm *dpm, unsigned index_t)
625 {
626 struct cortex_a8_common *a8 = dpm_to_a8(dpm);
627 uint32_t cr;
628
629 switch (index_t) {
630 case 0 ... 15:
631 cr = a8->armv7a_common.debug_base + CPUDBG_BCR_BASE;
632 break;
633 case 16 ... 31:
634 cr = a8->armv7a_common.debug_base + CPUDBG_WCR_BASE;
635 index_t -= 16;
636 break;
637 default:
638 return ERROR_FAIL;
639 }
640 cr += 4 * index_t;
641
642 LOG_DEBUG("A8: bpwp disable, cr %08x", (unsigned) cr);
643
644 /* clear control register */
645 return cortex_a8_dap_write_memap_register_u32(dpm->arm->target, cr, 0);
646 }
647
648 static int cortex_a8_dpm_setup(struct cortex_a8_common *a8, uint32_t didr)
649 {
650 struct arm_dpm *dpm = &a8->armv7a_common.dpm;
651 int retval;
652
653 dpm->arm = &a8->armv7a_common.armv4_5_common;
654 dpm->didr = didr;
655
656 dpm->prepare = cortex_a8_dpm_prepare;
657 dpm->finish = cortex_a8_dpm_finish;
658
659 dpm->instr_write_data_dcc = cortex_a8_instr_write_data_dcc;
660 dpm->instr_write_data_r0 = cortex_a8_instr_write_data_r0;
661 dpm->instr_cpsr_sync = cortex_a8_instr_cpsr_sync;
662
663 dpm->instr_read_data_dcc = cortex_a8_instr_read_data_dcc;
664 dpm->instr_read_data_r0 = cortex_a8_instr_read_data_r0;
665
666 dpm->bpwp_enable = cortex_a8_bpwp_enable;
667 dpm->bpwp_disable = cortex_a8_bpwp_disable;
668
669 retval = arm_dpm_setup(dpm);
670 if (retval == ERROR_OK)
671 retval = arm_dpm_initialize(dpm);
672
673 return retval;
674 }
675
676
677 /*
678 * Cortex-A8 Run control
679 */
680
681 static int cortex_a8_poll(struct target *target)
682 {
683 int retval = ERROR_OK;
684 uint32_t dscr;
685 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
686 struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
687 struct adiv5_dap *swjdp = &armv7a->dap;
688 enum target_state prev_target_state = target->state;
689 uint8_t saved_apsel = dap_ap_get_select(swjdp);
690
691 dap_ap_select(swjdp, swjdp_debugap);
692 retval = mem_ap_read_atomic_u32(swjdp,
693 armv7a->debug_base + CPUDBG_DSCR, &dscr);
694 if (retval != ERROR_OK)
695 {
696 dap_ap_select(swjdp, saved_apsel);
697 return retval;
698 }
699 cortex_a8->cpudbg_dscr = dscr;
700
701 if ((dscr & 0x3) == 0x3)
702 {
703 if (prev_target_state != TARGET_HALTED)
704 {
705 /* We have a halting debug event */
706 LOG_DEBUG("Target halted");
707 target->state = TARGET_HALTED;
708 if ((prev_target_state == TARGET_RUNNING)
709 || (prev_target_state == TARGET_RESET))
710 {
711 retval = cortex_a8_debug_entry(target);
712 if (retval != ERROR_OK)
713 return retval;
714
715 target_call_event_callbacks(target,
716 TARGET_EVENT_HALTED);
717 }
718 if (prev_target_state == TARGET_DEBUG_RUNNING)
719 {
720 LOG_DEBUG(" ");
721
722 retval = cortex_a8_debug_entry(target);
723 if (retval != ERROR_OK)
724 return retval;
725
726 target_call_event_callbacks(target,
727 TARGET_EVENT_DEBUG_HALTED);
728 }
729 }
730 }
731 else if ((dscr & 0x3) == 0x2)
732 {
733 target->state = TARGET_RUNNING;
734 }
735 else
736 {
737 LOG_DEBUG("Unknown target state dscr = 0x%08" PRIx32, dscr);
738 target->state = TARGET_UNKNOWN;
739 }
740
741 dap_ap_select(swjdp, saved_apsel);
742
743 return retval;
744 }
745
746 static int cortex_a8_halt(struct target *target)
747 {
748 int retval = ERROR_OK;
749 uint32_t dscr;
750 struct armv7a_common *armv7a = target_to_armv7a(target);
751 struct adiv5_dap *swjdp = &armv7a->dap;
752 uint8_t saved_apsel = dap_ap_get_select(swjdp);
753 dap_ap_select(swjdp, swjdp_debugap);
754
755 /*
756 * Tell the core to be halted by writing DRCR with 0x1
757 * and then wait for the core to be halted.
758 */
759 retval = mem_ap_write_atomic_u32(swjdp,
760 armv7a->debug_base + CPUDBG_DRCR, 0x1);
761 if (retval != ERROR_OK)
762 goto out;
763
764 /*
765 * enter halting debug mode
766 */
767 retval = mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DSCR, &dscr);
768 if (retval != ERROR_OK)
769 goto out;
770
771 retval = mem_ap_write_atomic_u32(swjdp,
772 armv7a->debug_base + CPUDBG_DSCR, dscr | DSCR_HALT_DBG_MODE);
773 if (retval != ERROR_OK)
774 goto out;
775
776 long long then = timeval_ms();
777 for (;;)
778 {
779 retval = mem_ap_read_atomic_u32(swjdp,
780 armv7a->debug_base + CPUDBG_DSCR, &dscr);
781 if (retval != ERROR_OK)
782 goto out;
783 if ((dscr & DSCR_CORE_HALTED) != 0)
784 {
785 break;
786 }
787 if (timeval_ms() > then + 1000)
788 {
789 LOG_ERROR("Timeout waiting for halt");
790 return ERROR_FAIL;
791 }
792 }
793
794 target->debug_reason = DBG_REASON_DBGRQ;
795
796 out:
797 dap_ap_select(swjdp, saved_apsel);
798 return retval;
799 }
800
801 static int cortex_a8_resume(struct target *target, int current,
802 uint32_t address, int handle_breakpoints, int debug_execution)
803 {
804 struct armv7a_common *armv7a = target_to_armv7a(target);
805 struct arm *armv4_5 = &armv7a->armv4_5_common;
806 struct adiv5_dap *swjdp = &armv7a->dap;
807 int retval;
808
809 // struct breakpoint *breakpoint = NULL;
810 uint32_t resume_pc, dscr;
811
812 uint8_t saved_apsel = dap_ap_get_select(swjdp);
813 dap_ap_select(swjdp, swjdp_debugap);
814
815 if (!debug_execution)
816 target_free_all_working_areas(target);
817
818 #if 0
819 if (debug_execution)
820 {
821 /* Disable interrupts */
822 /* We disable interrupts in the PRIMASK register instead of
823 * masking with C_MASKINTS,
824 * This is probably the same issue as Cortex-M3 Errata 377493:
825 * C_MASKINTS in parallel with disabled interrupts can cause
826 * local faults to not be taken. */
827 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_PRIMASK].value, 0, 32, 1);
828 armv7m->core_cache->reg_list[ARMV7M_PRIMASK].dirty = 1;
829 armv7m->core_cache->reg_list[ARMV7M_PRIMASK].valid = 1;
830
831 /* Make sure we are in Thumb mode */
832 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32,
833 buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32) | (1 << 24));
834 armv7m->core_cache->reg_list[ARMV7M_xPSR].dirty = 1;
835 armv7m->core_cache->reg_list[ARMV7M_xPSR].valid = 1;
836 }
837 #endif
838
839 /* current = 1: continue on current pc, otherwise continue at <address> */
840 resume_pc = buf_get_u32(armv4_5->pc->value, 0, 32);
841 if (!current)
842 resume_pc = address;
843
844 /* Make sure that the Armv7 gdb thumb fixups does not
845 * kill the return address
846 */
847 switch (armv4_5->core_state)
848 {
849 case ARM_STATE_ARM:
850 resume_pc &= 0xFFFFFFFC;
851 break;
852 case ARM_STATE_THUMB:
853 case ARM_STATE_THUMB_EE:
854 /* When the return address is loaded into PC
855 * bit 0 must be 1 to stay in Thumb state
856 */
857 resume_pc |= 0x1;
858 break;
859 case ARM_STATE_JAZELLE:
860 LOG_ERROR("How do I resume into Jazelle state??");
861 return ERROR_FAIL;
862 }
863 LOG_DEBUG("resume pc = 0x%08" PRIx32, resume_pc);
864 buf_set_u32(armv4_5->pc->value, 0, 32, resume_pc);
865 armv4_5->pc->dirty = 1;
866 armv4_5->pc->valid = 1;
867
868 retval = cortex_a8_restore_context(target, handle_breakpoints);
869 if (retval != ERROR_OK)
870 return retval;
871
872 #if 0
873 /* the front-end may request us not to handle breakpoints */
874 if (handle_breakpoints)
875 {
876 /* Single step past breakpoint at current address */
877 if ((breakpoint = breakpoint_find(target, resume_pc)))
878 {
879 LOG_DEBUG("unset breakpoint at 0x%8.8x", breakpoint->address);
880 cortex_m3_unset_breakpoint(target, breakpoint);
881 cortex_m3_single_step_core(target);
882 cortex_m3_set_breakpoint(target, breakpoint);
883 }
884 }
885
886 #endif
887 /* Restart core and wait for it to be started
888 * NOTE: this clears DSCR_ITR_EN and other bits.
889 *
890 * REVISIT: for single stepping, we probably want to
891 * disable IRQs by default, with optional override...
892 */
893 retval = mem_ap_write_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DRCR, 0x2);
894 if (retval != ERROR_OK)
895 return retval;
896
897 long long then = timeval_ms();
898 for (;;)
899 {
900 retval = mem_ap_read_atomic_u32(swjdp,
901 armv7a->debug_base + CPUDBG_DSCR, &dscr);
902 if (retval != ERROR_OK)
903 return retval;
904 if ((dscr & DSCR_CORE_RESTARTED) != 0)
905 break;
906 if (timeval_ms() > then + 1000)
907 {
908 LOG_ERROR("Timeout waiting for resume");
909 return ERROR_FAIL;
910 }
911 }
912
913 target->debug_reason = DBG_REASON_NOTHALTED;
914 target->state = TARGET_RUNNING;
915
916 /* registers are now invalid */
917 register_cache_invalidate(armv4_5->core_cache);
918
919 if (!debug_execution)
920 {
921 target->state = TARGET_RUNNING;
922 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
923 LOG_DEBUG("target resumed at 0x%" PRIx32, resume_pc);
924 }
925 else
926 {
927 target->state = TARGET_DEBUG_RUNNING;
928 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
929 LOG_DEBUG("target debug resumed at 0x%" PRIx32, resume_pc);
930 }
931
932 dap_ap_select(swjdp, saved_apsel);
933
934 return ERROR_OK;
935 }
936
937 static int cortex_a8_debug_entry(struct target *target)
938 {
939 int i;
940 uint32_t regfile[16], cpsr, dscr;
941 int retval = ERROR_OK;
942 struct working_area *regfile_working_area = NULL;
943 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
944 struct armv7a_common *armv7a = target_to_armv7a(target);
945 struct arm *armv4_5 = &armv7a->armv4_5_common;
946 struct adiv5_dap *swjdp = &armv7a->dap;
947 struct reg *reg;
948
949 LOG_DEBUG("dscr = 0x%08" PRIx32, cortex_a8->cpudbg_dscr);
950
951 /* REVISIT surely we should not re-read DSCR !! */
952 retval = mem_ap_read_atomic_u32(swjdp,
953 armv7a->debug_base + CPUDBG_DSCR, &dscr);
954 if (retval != ERROR_OK)
955 return retval;
956
957 /* REVISIT see A8 TRM 12.11.4 steps 2..3 -- make sure that any
958 * imprecise data aborts get discarded by issuing a Data
959 * Synchronization Barrier: ARMV4_5_MCR(15, 0, 0, 7, 10, 4).
960 */
961
962 /* Enable the ITR execution once we are in debug mode */
963 dscr |= DSCR_ITR_EN;
964 retval = mem_ap_write_atomic_u32(swjdp,
965 armv7a->debug_base + CPUDBG_DSCR, dscr);
966 if (retval != ERROR_OK)
967 return retval;
968
969 /* Examine debug reason */
970 arm_dpm_report_dscr(&armv7a->dpm, cortex_a8->cpudbg_dscr);
971
972 /* save address of instruction that triggered the watchpoint? */
973 if (target->debug_reason == DBG_REASON_WATCHPOINT) {
974 uint32_t wfar;
975
976 retval = mem_ap_read_atomic_u32(swjdp,
977 armv7a->debug_base + CPUDBG_WFAR,
978 &wfar);
979 if (retval != ERROR_OK)
980 return retval;
981 arm_dpm_report_wfar(&armv7a->dpm, wfar);
982 }
983
984 /* REVISIT fast_reg_read is never set ... */
985
986 /* Examine target state and mode */
987 if (cortex_a8->fast_reg_read)
988 target_alloc_working_area(target, 64, &regfile_working_area);
989
990 /* First load register acessible through core debug port*/
991 if (!regfile_working_area)
992 {
993 retval = arm_dpm_read_current_registers(&armv7a->dpm);
994 }
995 else
996 {
997 dap_ap_select(swjdp, swjdp_memoryap);
998 retval = cortex_a8_read_regs_through_mem(target,
999 regfile_working_area->address, regfile);
1000 dap_ap_select(swjdp, swjdp_memoryap);
1001 target_free_working_area(target, regfile_working_area);
1002 if (retval != ERROR_OK)
1003 {
1004 return retval;
1005 }
1006
1007 /* read Current PSR */
1008 retval = cortex_a8_dap_read_coreregister_u32(target, &cpsr, 16);
1009 if (retval != ERROR_OK)
1010 return retval;
1011 dap_ap_select(swjdp, swjdp_debugap);
1012 LOG_DEBUG("cpsr: %8.8" PRIx32, cpsr);
1013
1014 arm_set_cpsr(armv4_5, cpsr);
1015
1016 /* update cache */
1017 for (i = 0; i <= ARM_PC; i++)
1018 {
1019 reg = arm_reg_current(armv4_5, i);
1020
1021 buf_set_u32(reg->value, 0, 32, regfile[i]);
1022 reg->valid = 1;
1023 reg->dirty = 0;
1024 }
1025
1026 /* Fixup PC Resume Address */
1027 if (cpsr & (1 << 5))
1028 {
1029 // T bit set for Thumb or ThumbEE state
1030 regfile[ARM_PC] -= 4;
1031 }
1032 else
1033 {
1034 // ARM state
1035 regfile[ARM_PC] -= 8;
1036 }
1037
1038 reg = armv4_5->pc;
1039 buf_set_u32(reg->value, 0, 32, regfile[ARM_PC]);
1040 reg->dirty = reg->valid;
1041 }
1042
1043 #if 0
1044 /* TODO, Move this */
1045 uint32_t cp15_control_register, cp15_cacr, cp15_nacr;
1046 cortex_a8_read_cp(target, &cp15_control_register, 15, 0, 1, 0, 0);
1047 LOG_DEBUG("cp15_control_register = 0x%08x", cp15_control_register);
1048
1049 cortex_a8_read_cp(target, &cp15_cacr, 15, 0, 1, 0, 2);
1050 LOG_DEBUG("cp15 Coprocessor Access Control Register = 0x%08x", cp15_cacr);
1051
1052 cortex_a8_read_cp(target, &cp15_nacr, 15, 0, 1, 1, 2);
1053 LOG_DEBUG("cp15 Nonsecure Access Control Register = 0x%08x", cp15_nacr);
1054 #endif
1055
1056 /* Are we in an exception handler */
1057 // armv4_5->exception_number = 0;
1058 if (armv7a->post_debug_entry)
1059 {
1060 retval = armv7a->post_debug_entry(target);
1061 if (retval != ERROR_OK)
1062 return retval;
1063 }
1064
1065 return retval;
1066 }
1067
1068 static int cortex_a8_post_debug_entry(struct target *target)
1069 {
1070 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1071 struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
1072 int retval;
1073
1074 /* MRC p15,0,<Rt>,c1,c0,0 ; Read CP15 System Control Register */
1075 retval = armv7a->armv4_5_common.mrc(target, 15,
1076 0, 0, /* op1, op2 */
1077 1, 0, /* CRn, CRm */
1078 &cortex_a8->cp15_control_reg);
1079 if (retval != ERROR_OK)
1080 return retval;
1081 LOG_DEBUG("cp15_control_reg: %8.8" PRIx32, cortex_a8->cp15_control_reg);
1082
1083 if (armv7a->armv4_5_mmu.armv4_5_cache.ctype == -1)
1084 {
1085 uint32_t cache_type_reg;
1086
1087 /* MRC p15,0,<Rt>,c0,c0,1 ; Read CP15 Cache Type Register */
1088 retval = armv7a->armv4_5_common.mrc(target, 15,
1089 0, 1, /* op1, op2 */
1090 0, 0, /* CRn, CRm */
1091 &cache_type_reg);
1092 if (retval != ERROR_OK)
1093 return retval;
1094 LOG_DEBUG("cp15 cache type: %8.8x", (unsigned) cache_type_reg);
1095
1096 /* FIXME the armv4_4 cache info DOES NOT APPLY to Cortex-A8 */
1097 armv4_5_identify_cache(cache_type_reg,
1098 &armv7a->armv4_5_mmu.armv4_5_cache);
1099 }
1100
1101 armv7a->armv4_5_mmu.mmu_enabled =
1102 (cortex_a8->cp15_control_reg & 0x1U) ? 1 : 0;
1103 armv7a->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled =
1104 (cortex_a8->cp15_control_reg & 0x4U) ? 1 : 0;
1105 armv7a->armv4_5_mmu.armv4_5_cache.i_cache_enabled =
1106 (cortex_a8->cp15_control_reg & 0x1000U) ? 1 : 0;
1107
1108 return ERROR_OK;
1109 }
1110
1111 static int cortex_a8_step(struct target *target, int current, uint32_t address,
1112 int handle_breakpoints)
1113 {
1114 struct armv7a_common *armv7a = target_to_armv7a(target);
1115 struct arm *armv4_5 = &armv7a->armv4_5_common;
1116 struct breakpoint *breakpoint = NULL;
1117 struct breakpoint stepbreakpoint;
1118 struct reg *r;
1119 int retval;
1120
1121 if (target->state != TARGET_HALTED)
1122 {
1123 LOG_WARNING("target not halted");
1124 return ERROR_TARGET_NOT_HALTED;
1125 }
1126
1127 /* current = 1: continue on current pc, otherwise continue at <address> */
1128 r = armv4_5->pc;
1129 if (!current)
1130 {
1131 buf_set_u32(r->value, 0, 32, address);
1132 }
1133 else
1134 {
1135 address = buf_get_u32(r->value, 0, 32);
1136 }
1137
1138 /* The front-end may request us not to handle breakpoints.
1139 * But since Cortex-A8 uses breakpoint for single step,
1140 * we MUST handle breakpoints.
1141 */
1142 handle_breakpoints = 1;
1143 if (handle_breakpoints) {
1144 breakpoint = breakpoint_find(target, address);
1145 if (breakpoint)
1146 cortex_a8_unset_breakpoint(target, breakpoint);
1147 }
1148
1149 /* Setup single step breakpoint */
1150 stepbreakpoint.address = address;
1151 stepbreakpoint.length = (armv4_5->core_state == ARM_STATE_THUMB)
1152 ? 2 : 4;
1153 stepbreakpoint.type = BKPT_HARD;
1154 stepbreakpoint.set = 0;
1155
1156 /* Break on IVA mismatch */
1157 cortex_a8_set_breakpoint(target, &stepbreakpoint, 0x04);
1158
1159 target->debug_reason = DBG_REASON_SINGLESTEP;
1160
1161 retval = cortex_a8_resume(target, 1, address, 0, 0);
1162 if (retval != ERROR_OK)
1163 return retval;
1164
1165 long long then = timeval_ms();
1166 while (target->state != TARGET_HALTED)
1167 {
1168 retval = cortex_a8_poll(target);
1169 if (retval != ERROR_OK)
1170 return retval;
1171 if (timeval_ms() > then + 1000)
1172 {
1173 LOG_ERROR("timeout waiting for target halt");
1174 return ERROR_FAIL;
1175 }
1176 }
1177
1178 cortex_a8_unset_breakpoint(target, &stepbreakpoint);
1179
1180 target->debug_reason = DBG_REASON_BREAKPOINT;
1181
1182 if (breakpoint)
1183 cortex_a8_set_breakpoint(target, breakpoint, 0);
1184
1185 if (target->state != TARGET_HALTED)
1186 LOG_DEBUG("target stepped");
1187
1188 return ERROR_OK;
1189 }
1190
1191 static int cortex_a8_restore_context(struct target *target, bool bpwp)
1192 {
1193 struct armv7a_common *armv7a = target_to_armv7a(target);
1194
1195 LOG_DEBUG(" ");
1196
1197 if (armv7a->pre_restore_context)
1198 armv7a->pre_restore_context(target);
1199
1200 return arm_dpm_write_dirty_registers(&armv7a->dpm, bpwp);
1201 }
1202
1203
1204 /*
1205 * Cortex-A8 Breakpoint and watchpoint functions
1206 */
1207
1208 /* Setup hardware Breakpoint Register Pair */
1209 static int cortex_a8_set_breakpoint(struct target *target,
1210 struct breakpoint *breakpoint, uint8_t matchmode)
1211 {
1212 int retval;
1213 int brp_i=0;
1214 uint32_t control;
1215 uint8_t byte_addr_select = 0x0F;
1216 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1217 struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
1218 struct cortex_a8_brp * brp_list = cortex_a8->brp_list;
1219
1220 if (breakpoint->set)
1221 {
1222 LOG_WARNING("breakpoint already set");
1223 return ERROR_OK;
1224 }
1225
1226 if (breakpoint->type == BKPT_HARD)
1227 {
1228 while (brp_list[brp_i].used && (brp_i < cortex_a8->brp_num))
1229 brp_i++ ;
1230 if (brp_i >= cortex_a8->brp_num)
1231 {
1232 LOG_ERROR("ERROR Can not find free Breakpoint Register Pair");
1233 return ERROR_FAIL;
1234 }
1235 breakpoint->set = brp_i + 1;
1236 if (breakpoint->length == 2)
1237 {
1238 byte_addr_select = (3 << (breakpoint->address & 0x02));
1239 }
1240 control = ((matchmode & 0x7) << 20)
1241 | (byte_addr_select << 5)
1242 | (3 << 1) | 1;
1243 brp_list[brp_i].used = 1;
1244 brp_list[brp_i].value = (breakpoint->address & 0xFFFFFFFC);
1245 brp_list[brp_i].control = control;
1246 retval = cortex_a8_dap_write_memap_register_u32(target, armv7a->debug_base
1247 + CPUDBG_BVR_BASE + 4 * brp_list[brp_i].BRPn,
1248 brp_list[brp_i].value);
1249 if (retval != ERROR_OK)
1250 return retval;
1251 retval = cortex_a8_dap_write_memap_register_u32(target, armv7a->debug_base
1252 + CPUDBG_BCR_BASE + 4 * brp_list[brp_i].BRPn,
1253 brp_list[brp_i].control);
1254 if (retval != ERROR_OK)
1255 return retval;
1256 LOG_DEBUG("brp %i control 0x%0" PRIx32 " value 0x%0" PRIx32, brp_i,
1257 brp_list[brp_i].control,
1258 brp_list[brp_i].value);
1259 }
1260 else if (breakpoint->type == BKPT_SOFT)
1261 {
1262 uint8_t code[4];
1263 if (breakpoint->length == 2)
1264 {
1265 buf_set_u32(code, 0, 32, ARMV5_T_BKPT(0x11));
1266 }
1267 else
1268 {
1269 buf_set_u32(code, 0, 32, ARMV5_BKPT(0x11));
1270 }
1271 retval = target->type->read_memory(target,
1272 breakpoint->address & 0xFFFFFFFE,
1273 breakpoint->length, 1,
1274 breakpoint->orig_instr);
1275 if (retval != ERROR_OK)
1276 return retval;
1277 retval = target->type->write_memory(target,
1278 breakpoint->address & 0xFFFFFFFE,
1279 breakpoint->length, 1, code);
1280 if (retval != ERROR_OK)
1281 return retval;
1282 breakpoint->set = 0x11; /* Any nice value but 0 */
1283 }
1284
1285 return ERROR_OK;
1286 }
1287
1288 static int cortex_a8_unset_breakpoint(struct target *target, struct breakpoint *breakpoint)
1289 {
1290 int retval;
1291 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1292 struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
1293 struct cortex_a8_brp * brp_list = cortex_a8->brp_list;
1294
1295 if (!breakpoint->set)
1296 {
1297 LOG_WARNING("breakpoint not set");
1298 return ERROR_OK;
1299 }
1300
1301 if (breakpoint->type == BKPT_HARD)
1302 {
1303 int brp_i = breakpoint->set - 1;
1304 if ((brp_i < 0) || (brp_i >= cortex_a8->brp_num))
1305 {
1306 LOG_DEBUG("Invalid BRP number in breakpoint");
1307 return ERROR_OK;
1308 }
1309 LOG_DEBUG("rbp %i control 0x%0" PRIx32 " value 0x%0" PRIx32, brp_i,
1310 brp_list[brp_i].control, brp_list[brp_i].value);
1311 brp_list[brp_i].used = 0;
1312 brp_list[brp_i].value = 0;
1313 brp_list[brp_i].control = 0;
1314 retval = cortex_a8_dap_write_memap_register_u32(target, armv7a->debug_base
1315 + CPUDBG_BCR_BASE + 4 * brp_list[brp_i].BRPn,
1316 brp_list[brp_i].control);
1317 if (retval != ERROR_OK)
1318 return retval;
1319 retval = cortex_a8_dap_write_memap_register_u32(target, armv7a->debug_base
1320 + CPUDBG_BVR_BASE + 4 * brp_list[brp_i].BRPn,
1321 brp_list[brp_i].value);
1322 if (retval != ERROR_OK)
1323 return retval;
1324 }
1325 else
1326 {
1327 /* restore original instruction (kept in target endianness) */
1328 if (breakpoint->length == 4)
1329 {
1330 retval = target->type->write_memory(target,
1331 breakpoint->address & 0xFFFFFFFE,
1332 4, 1, breakpoint->orig_instr);
1333 if (retval != ERROR_OK)
1334 return retval;
1335 }
1336 else
1337 {
1338 retval = target->type->write_memory(target,
1339 breakpoint->address & 0xFFFFFFFE,
1340 2, 1, breakpoint->orig_instr);
1341 if (retval != ERROR_OK)
1342 return retval;
1343 }
1344 }
1345 breakpoint->set = 0;
1346
1347 return ERROR_OK;
1348 }
1349
1350 static int cortex_a8_add_breakpoint(struct target *target,
1351 struct breakpoint *breakpoint)
1352 {
1353 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1354
1355 if ((breakpoint->type == BKPT_HARD) && (cortex_a8->brp_num_available < 1))
1356 {
1357 LOG_INFO("no hardware breakpoint available");
1358 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1359 }
1360
1361 if (breakpoint->type == BKPT_HARD)
1362 cortex_a8->brp_num_available--;
1363 cortex_a8_set_breakpoint(target, breakpoint, 0x00); /* Exact match */
1364
1365 return ERROR_OK;
1366 }
1367
1368 static int cortex_a8_remove_breakpoint(struct target *target, struct breakpoint *breakpoint)
1369 {
1370 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1371
1372 #if 0
1373 /* It is perfectly possible to remove breakpoints while the target is running */
1374 if (target->state != TARGET_HALTED)
1375 {
1376 LOG_WARNING("target not halted");
1377 return ERROR_TARGET_NOT_HALTED;
1378 }
1379 #endif
1380
1381 if (breakpoint->set)
1382 {
1383 cortex_a8_unset_breakpoint(target, breakpoint);
1384 if (breakpoint->type == BKPT_HARD)
1385 cortex_a8->brp_num_available++ ;
1386 }
1387
1388
1389 return ERROR_OK;
1390 }
1391
1392
1393
1394 /*
1395 * Cortex-A8 Reset functions
1396 */
1397
1398 static int cortex_a8_assert_reset(struct target *target)
1399 {
1400 struct armv7a_common *armv7a = target_to_armv7a(target);
1401
1402 LOG_DEBUG(" ");
1403
1404 /* FIXME when halt is requested, make it work somehow... */
1405
1406 /* Issue some kind of warm reset. */
1407 if (target_has_event_action(target, TARGET_EVENT_RESET_ASSERT)) {
1408 target_handle_event(target, TARGET_EVENT_RESET_ASSERT);
1409 } else if (jtag_get_reset_config() & RESET_HAS_SRST) {
1410 /* REVISIT handle "pulls" cases, if there's
1411 * hardware that needs them to work.
1412 */
1413 jtag_add_reset(0, 1);
1414 } else {
1415 LOG_ERROR("%s: how to reset?", target_name(target));
1416 return ERROR_FAIL;
1417 }
1418
1419 /* registers are now invalid */
1420 register_cache_invalidate(armv7a->armv4_5_common.core_cache);
1421
1422 target->state = TARGET_RESET;
1423
1424 return ERROR_OK;
1425 }
1426
1427 static int cortex_a8_deassert_reset(struct target *target)
1428 {
1429 int retval;
1430
1431 LOG_DEBUG(" ");
1432
1433 /* be certain SRST is off */
1434 jtag_add_reset(0, 0);
1435
1436 retval = cortex_a8_poll(target);
1437 if (retval != ERROR_OK)
1438 return retval;
1439
1440 if (target->reset_halt) {
1441 if (target->state != TARGET_HALTED) {
1442 LOG_WARNING("%s: ran after reset and before halt ...",
1443 target_name(target));
1444 if ((retval = target_halt(target)) != ERROR_OK)
1445 return retval;
1446 }
1447 }
1448
1449 return ERROR_OK;
1450 }
1451
1452 /*
1453 * Cortex-A8 Memory access
1454 *
1455 * This is same Cortex M3 but we must also use the correct
1456 * ap number for every access.
1457 */
1458
1459 static int cortex_a8_read_phys_memory(struct target *target,
1460 uint32_t address, uint32_t size,
1461 uint32_t count, uint8_t *buffer)
1462 {
1463 struct armv7a_common *armv7a = target_to_armv7a(target);
1464 struct adiv5_dap *swjdp = &armv7a->dap;
1465 int retval = ERROR_INVALID_ARGUMENTS;
1466
1467 /* cortex_a8 handles unaligned memory access */
1468
1469 // ??? dap_ap_select(swjdp, swjdp_memoryap);
1470 LOG_DEBUG("Reading memory at real address 0x%x; size %d; count %d", address, size, count);
1471 if (count && buffer) {
1472 switch (size) {
1473 case 4:
1474 retval = mem_ap_read_buf_u32(swjdp, buffer, 4 * count, address);
1475 break;
1476 case 2:
1477 retval = mem_ap_read_buf_u16(swjdp, buffer, 2 * count, address);
1478 break;
1479 case 1:
1480 retval = mem_ap_read_buf_u8(swjdp, buffer, count, address);
1481 break;
1482 }
1483 }
1484
1485 return retval;
1486 }
1487
1488 static int cortex_a8_read_memory(struct target *target, uint32_t address,
1489 uint32_t size, uint32_t count, uint8_t *buffer)
1490 {
1491 int enabled = 0;
1492 uint32_t virt, phys;
1493 int retval;
1494
1495 /* cortex_a8 handles unaligned memory access */
1496
1497 // ??? dap_ap_select(swjdp, swjdp_memoryap);
1498 LOG_DEBUG("Reading memory at address 0x%x; size %d; count %d", address, size, count);
1499 retval = cortex_a8_mmu(target, &enabled);
1500 if (retval != ERROR_OK)
1501 return retval;
1502
1503 if(enabled)
1504 {
1505 virt = address;
1506 retval = cortex_a8_virt2phys(target, virt, &phys);
1507 if (retval != ERROR_OK)
1508 return retval;
1509
1510 LOG_DEBUG("Reading at virtual address. Translating v:0x%x to r:0x%x", virt, phys);
1511 address = phys;
1512 }
1513
1514 return cortex_a8_read_phys_memory(target, address, size, count, buffer);
1515 }
1516
1517 static int cortex_a8_write_phys_memory(struct target *target,
1518 uint32_t address, uint32_t size,
1519 uint32_t count, uint8_t *buffer)
1520 {
1521 struct armv7a_common *armv7a = target_to_armv7a(target);
1522 struct adiv5_dap *swjdp = &armv7a->dap;
1523 int retval = ERROR_INVALID_ARGUMENTS;
1524
1525 // ??? dap_ap_select(swjdp, swjdp_memoryap);
1526
1527 LOG_DEBUG("Writing memory to real address 0x%x; size %d; count %d", address, size, count);
1528 if (count && buffer) {
1529 switch (size) {
1530 case 4:
1531 retval = mem_ap_write_buf_u32(swjdp, buffer, 4 * count, address);
1532 break;
1533 case 2:
1534 retval = mem_ap_write_buf_u16(swjdp, buffer, 2 * count, address);
1535 break;
1536 case 1:
1537 retval = mem_ap_write_buf_u8(swjdp, buffer, count, address);
1538 break;
1539 }
1540 }
1541
1542 /* REVISIT this op is generic ARMv7-A/R stuff */
1543 if (retval == ERROR_OK && target->state == TARGET_HALTED)
1544 {
1545 struct arm_dpm *dpm = armv7a->armv4_5_common.dpm;
1546
1547 retval = dpm->prepare(dpm);
1548 if (retval != ERROR_OK)
1549 return retval;
1550
1551 /* The Cache handling will NOT work with MMU active, the
1552 * wrong addresses will be invalidated!
1553 *
1554 * For both ICache and DCache, walk all cache lines in the
1555 * address range. Cortex-A8 has fixed 64 byte line length.
1556 *
1557 * REVISIT per ARMv7, these may trigger watchpoints ...
1558 */
1559
1560 /* invalidate I-Cache */
1561 if (armv7a->armv4_5_mmu.armv4_5_cache.i_cache_enabled)
1562 {
1563 /* ICIMVAU - Invalidate Cache single entry
1564 * with MVA to PoU
1565 * MCR p15, 0, r0, c7, c5, 1
1566 */
1567 for (uint32_t cacheline = address;
1568 cacheline < address + size * count;
1569 cacheline += 64) {
1570 retval = dpm->instr_write_data_r0(dpm,
1571 ARMV4_5_MCR(15, 0, 0, 7, 5, 1),
1572 cacheline);
1573 if (retval != ERROR_OK)
1574 return retval;
1575 }
1576 }
1577
1578 /* invalidate D-Cache */
1579 if (armv7a->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled)
1580 {
1581 /* DCIMVAC - Invalidate data Cache line
1582 * with MVA to PoC
1583 * MCR p15, 0, r0, c7, c6, 1
1584 */
1585 for (uint32_t cacheline = address;
1586 cacheline < address + size * count;
1587 cacheline += 64) {
1588 retval = dpm->instr_write_data_r0(dpm,
1589 ARMV4_5_MCR(15, 0, 0, 7, 6, 1),
1590 cacheline);
1591 if (retval != ERROR_OK)
1592 return retval;
1593 }
1594 }
1595
1596 /* (void) */ dpm->finish(dpm);
1597 }
1598
1599 return retval;
1600 }
1601
1602 static int cortex_a8_write_memory(struct target *target, uint32_t address,
1603 uint32_t size, uint32_t count, uint8_t *buffer)
1604 {
1605 int enabled = 0;
1606 uint32_t virt, phys;
1607 int retval;
1608
1609 // ??? dap_ap_select(swjdp, swjdp_memoryap);
1610
1611 LOG_DEBUG("Writing memory to address 0x%x; size %d; count %d", address, size, count);
1612 retval = cortex_a8_mmu(target, &enabled);
1613 if (retval != ERROR_OK)
1614 return retval;
1615 if(enabled)
1616 {
1617 virt = address;
1618 retval = cortex_a8_virt2phys(target, virt, &phys);
1619 if (retval != ERROR_OK)
1620 return retval;
1621 LOG_DEBUG("Writing to virtual address. Translating v:0x%x to r:0x%x", virt, phys);
1622 address = phys;
1623 }
1624
1625 return cortex_a8_write_phys_memory(target, address, size,
1626 count, buffer);
1627 }
1628
1629 static int cortex_a8_bulk_write_memory(struct target *target, uint32_t address,
1630 uint32_t count, uint8_t *buffer)
1631 {
1632 return cortex_a8_write_memory(target, address, 4, count, buffer);
1633 }
1634
1635
1636 static int cortex_a8_dcc_read(struct adiv5_dap *swjdp, uint8_t *value, uint8_t *ctrl)
1637 {
1638 #if 0
1639 u16 dcrdr;
1640
1641 mem_ap_read_buf_u16(swjdp, (uint8_t*)&dcrdr, 1, DCB_DCRDR);
1642 *ctrl = (uint8_t)dcrdr;
1643 *value = (uint8_t)(dcrdr >> 8);
1644
1645 LOG_DEBUG("data 0x%x ctrl 0x%x", *value, *ctrl);
1646
1647 /* write ack back to software dcc register
1648 * signify we have read data */
1649 if (dcrdr & (1 << 0))
1650 {
1651 dcrdr = 0;
1652 mem_ap_write_buf_u16(swjdp, (uint8_t*)&dcrdr, 1, DCB_DCRDR);
1653 }
1654 #endif
1655 return ERROR_OK;
1656 }
1657
1658
1659 static int cortex_a8_handle_target_request(void *priv)
1660 {
1661 struct target *target = priv;
1662 struct armv7a_common *armv7a = target_to_armv7a(target);
1663 struct adiv5_dap *swjdp = &armv7a->dap;
1664 int retval;
1665
1666 if (!target_was_examined(target))
1667 return ERROR_OK;
1668 if (!target->dbg_msg_enabled)
1669 return ERROR_OK;
1670
1671 if (target->state == TARGET_RUNNING)
1672 {
1673 uint8_t data = 0;
1674 uint8_t ctrl = 0;
1675
1676 retval = cortex_a8_dcc_read(swjdp, &data, &ctrl);
1677 if (retval != ERROR_OK)
1678 return retval;
1679
1680 /* check if we have data */
1681 if (ctrl & (1 << 0))
1682 {
1683 uint32_t request;
1684
1685 /* we assume target is quick enough */
1686 request = data;
1687 retval = cortex_a8_dcc_read(swjdp, &data, &ctrl);
1688 if (retval != ERROR_OK)
1689 return retval;
1690 request |= (data << 8);
1691 retval = cortex_a8_dcc_read(swjdp, &data, &ctrl);
1692 if (retval != ERROR_OK)
1693 return retval;
1694 request |= (data << 16);
1695 retval = cortex_a8_dcc_read(swjdp, &data, &ctrl);
1696 if (retval != ERROR_OK)
1697 return retval;
1698 request |= (data << 24);
1699 target_request(target, request);
1700 }
1701 }
1702
1703 return ERROR_OK;
1704 }
1705
1706 /*
1707 * Cortex-A8 target information and configuration
1708 */
1709
1710 static int cortex_a8_examine_first(struct target *target)
1711 {
1712 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1713 struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
1714 struct adiv5_dap *swjdp = &armv7a->dap;
1715 int i;
1716 int retval = ERROR_OK;
1717 uint32_t didr, ctypr, ttypr, cpuid;
1718
1719 /* stop assuming this is an OMAP! */
1720 LOG_DEBUG("TODO - autoconfigure");
1721
1722 /* Here we shall insert a proper ROM Table scan */
1723 armv7a->debug_base = OMAP3530_DEBUG_BASE;
1724
1725 /* We do one extra read to ensure DAP is configured,
1726 * we call ahbap_debugport_init(swjdp) instead
1727 */
1728 retval = ahbap_debugport_init(swjdp);
1729 if (retval != ERROR_OK)
1730 return retval;
1731
1732 retval = mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_CPUID, &cpuid);
1733 if (retval != ERROR_OK)
1734 return retval;
1735
1736 if ((retval = mem_ap_read_atomic_u32(swjdp,
1737 armv7a->debug_base + CPUDBG_CPUID, &cpuid)) != ERROR_OK)
1738 {
1739 LOG_DEBUG("Examine %s failed", "CPUID");
1740 return retval;
1741 }
1742
1743 if ((retval = mem_ap_read_atomic_u32(swjdp,
1744 armv7a->debug_base + CPUDBG_CTYPR, &ctypr)) != ERROR_OK)
1745 {
1746 LOG_DEBUG("Examine %s failed", "CTYPR");
1747 return retval;
1748 }
1749
1750 if ((retval = mem_ap_read_atomic_u32(swjdp,
1751 armv7a->debug_base + CPUDBG_TTYPR, &ttypr)) != ERROR_OK)
1752 {
1753 LOG_DEBUG("Examine %s failed", "TTYPR");
1754 return retval;
1755 }
1756
1757 if ((retval = mem_ap_read_atomic_u32(swjdp,
1758 armv7a->debug_base + CPUDBG_DIDR, &didr)) != ERROR_OK)
1759 {
1760 LOG_DEBUG("Examine %s failed", "DIDR");
1761 return retval;
1762 }
1763
1764 LOG_DEBUG("cpuid = 0x%08" PRIx32, cpuid);
1765 LOG_DEBUG("ctypr = 0x%08" PRIx32, ctypr);
1766 LOG_DEBUG("ttypr = 0x%08" PRIx32, ttypr);
1767 LOG_DEBUG("didr = 0x%08" PRIx32, didr);
1768
1769 armv7a->armv4_5_common.core_type = ARM_MODE_MON;
1770 retval = cortex_a8_dpm_setup(cortex_a8, didr);
1771 if (retval != ERROR_OK)
1772 return retval;
1773
1774 /* Setup Breakpoint Register Pairs */
1775 cortex_a8->brp_num = ((didr >> 24) & 0x0F) + 1;
1776 cortex_a8->brp_num_context = ((didr >> 20) & 0x0F) + 1;
1777 cortex_a8->brp_num_available = cortex_a8->brp_num;
1778 cortex_a8->brp_list = calloc(cortex_a8->brp_num, sizeof(struct cortex_a8_brp));
1779 // cortex_a8->brb_enabled = ????;
1780 for (i = 0; i < cortex_a8->brp_num; i++)
1781 {
1782 cortex_a8->brp_list[i].used = 0;
1783 if (i < (cortex_a8->brp_num-cortex_a8->brp_num_context))
1784 cortex_a8->brp_list[i].type = BRP_NORMAL;
1785 else
1786 cortex_a8->brp_list[i].type = BRP_CONTEXT;
1787 cortex_a8->brp_list[i].value = 0;
1788 cortex_a8->brp_list[i].control = 0;
1789 cortex_a8->brp_list[i].BRPn = i;
1790 }
1791
1792 LOG_DEBUG("Configured %i hw breakpoints", cortex_a8->brp_num);
1793
1794 target_set_examined(target);
1795 return ERROR_OK;
1796 }
1797
1798 static int cortex_a8_examine(struct target *target)
1799 {
1800 int retval = ERROR_OK;
1801
1802 /* don't re-probe hardware after each reset */
1803 if (!target_was_examined(target))
1804 retval = cortex_a8_examine_first(target);
1805
1806 /* Configure core debug access */
1807 if (retval == ERROR_OK)
1808 retval = cortex_a8_init_debug_access(target);
1809
1810 return retval;
1811 }
1812
1813 /*
1814 * Cortex-A8 target creation and initialization
1815 */
1816
1817 static int cortex_a8_init_target(struct command_context *cmd_ctx,
1818 struct target *target)
1819 {
1820 /* examine_first() does a bunch of this */
1821 return ERROR_OK;
1822 }
1823
1824 static int cortex_a8_init_arch_info(struct target *target,
1825 struct cortex_a8_common *cortex_a8, struct jtag_tap *tap)
1826 {
1827 struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
1828 struct arm *armv4_5 = &armv7a->armv4_5_common;
1829 struct adiv5_dap *dap = &armv7a->dap;
1830
1831 armv7a->armv4_5_common.dap = dap;
1832
1833 /* Setup struct cortex_a8_common */
1834 cortex_a8->common_magic = CORTEX_A8_COMMON_MAGIC;
1835 armv4_5->arch_info = armv7a;
1836
1837 /* prepare JTAG information for the new target */
1838 cortex_a8->jtag_info.tap = tap;
1839 cortex_a8->jtag_info.scann_size = 4;
1840
1841 /* Leave (only) generic DAP stuff for debugport_init() */
1842 dap->jtag_info = &cortex_a8->jtag_info;
1843 dap->memaccess_tck = 80;
1844
1845 /* Number of bits for tar autoincrement, impl. dep. at least 10 */
1846 dap->tar_autoincr_block = (1 << 10);
1847
1848 cortex_a8->fast_reg_read = 0;
1849
1850 /* Set default value */
1851 cortex_a8->current_address_mode = ARM_MODE_ANY;
1852
1853 /* register arch-specific functions */
1854 armv7a->examine_debug_reason = NULL;
1855
1856 armv7a->post_debug_entry = cortex_a8_post_debug_entry;
1857
1858 armv7a->pre_restore_context = NULL;
1859 armv7a->armv4_5_mmu.armv4_5_cache.ctype = -1;
1860 armv7a->armv4_5_mmu.get_ttb = cortex_a8_get_ttb;
1861 armv7a->armv4_5_mmu.read_memory = cortex_a8_read_phys_memory;
1862 armv7a->armv4_5_mmu.write_memory = cortex_a8_write_phys_memory;
1863 armv7a->armv4_5_mmu.disable_mmu_caches = cortex_a8_disable_mmu_caches;
1864 armv7a->armv4_5_mmu.enable_mmu_caches = cortex_a8_enable_mmu_caches;
1865 armv7a->armv4_5_mmu.has_tiny_pages = 1;
1866 armv7a->armv4_5_mmu.mmu_enabled = 0;
1867
1868
1869 // arm7_9->handle_target_request = cortex_a8_handle_target_request;
1870
1871 /* REVISIT v7a setup should be in a v7a-specific routine */
1872 arm_init_arch_info(target, armv4_5);
1873 armv7a->common_magic = ARMV7_COMMON_MAGIC;
1874
1875 target_register_timer_callback(cortex_a8_handle_target_request, 1, 1, target);
1876
1877 return ERROR_OK;
1878 }
1879
1880 static int cortex_a8_target_create(struct target *target, Jim_Interp *interp)
1881 {
1882 struct cortex_a8_common *cortex_a8 = calloc(1, sizeof(struct cortex_a8_common));
1883
1884 return cortex_a8_init_arch_info(target, cortex_a8, target->tap);
1885 }
1886
1887 static int cortex_a8_get_ttb(struct target *target, uint32_t *result)
1888 {
1889 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1890 struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
1891 uint32_t ttb = 0, retval = ERROR_OK;
1892
1893 /* current_address_mode is set inside cortex_a8_virt2phys()
1894 where we can determine if address belongs to user or kernel */
1895 if(cortex_a8->current_address_mode == ARM_MODE_SVC)
1896 {
1897 /* MRC p15,0,<Rt>,c1,c0,0 ; Read CP15 System Control Register */
1898 retval = armv7a->armv4_5_common.mrc(target, 15,
1899 0, 1, /* op1, op2 */
1900 2, 0, /* CRn, CRm */
1901 &ttb);
1902 if (retval != ERROR_OK)
1903 return retval;
1904 }
1905 else if(cortex_a8->current_address_mode == ARM_MODE_USR)
1906 {
1907 /* MRC p15,0,<Rt>,c1,c0,0 ; Read CP15 System Control Register */
1908 retval = armv7a->armv4_5_common.mrc(target, 15,
1909 0, 0, /* op1, op2 */
1910 2, 0, /* CRn, CRm */
1911 &ttb);
1912 if (retval != ERROR_OK)
1913 return retval;
1914 }
1915 /* we don't know whose address is: user or kernel
1916 we assume that if we are in kernel mode then
1917 address belongs to kernel else if in user mode
1918 - to user */
1919 else if(armv7a->armv4_5_common.core_mode == ARM_MODE_SVC)
1920 {
1921 /* MRC p15,0,<Rt>,c1,c0,0 ; Read CP15 System Control Register */
1922 retval = armv7a->armv4_5_common.mrc(target, 15,
1923 0, 1, /* op1, op2 */
1924 2, 0, /* CRn, CRm */
1925 &ttb);
1926 if (retval != ERROR_OK)
1927 return retval;
1928 }
1929 else if(armv7a->armv4_5_common.core_mode == ARM_MODE_USR)
1930 {
1931 /* MRC p15,0,<Rt>,c1,c0,0 ; Read CP15 System Control Register */
1932 retval = armv7a->armv4_5_common.mrc(target, 15,
1933 0, 0, /* op1, op2 */
1934 2, 0, /* CRn, CRm */
1935 &ttb);
1936 if (retval != ERROR_OK)
1937 return retval;
1938 }
1939 /* finally we don't know whose ttb to use: user or kernel */
1940 else
1941 LOG_ERROR("Don't know how to get ttb for current mode!!!");
1942
1943 ttb &= 0xffffc000;
1944
1945 *result = ttb;
1946
1947 return ERROR_OK;
1948 }
1949
1950 static int cortex_a8_disable_mmu_caches(struct target *target, int mmu,
1951 int d_u_cache, int i_cache)
1952 {
1953 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1954 struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
1955 uint32_t cp15_control;
1956 int retval;
1957
1958 /* read cp15 control register */
1959 retval = armv7a->armv4_5_common.mrc(target, 15,
1960 0, 0, /* op1, op2 */
1961 1, 0, /* CRn, CRm */
1962 &cp15_control);
1963 if (retval != ERROR_OK)
1964 return retval;
1965
1966
1967 if (mmu)
1968 cp15_control &= ~0x1U;
1969
1970 if (d_u_cache)
1971 cp15_control &= ~0x4U;
1972
1973 if (i_cache)
1974 cp15_control &= ~0x1000U;
1975
1976 retval = armv7a->armv4_5_common.mcr(target, 15,
1977 0, 0, /* op1, op2 */
1978 1, 0, /* CRn, CRm */
1979 cp15_control);
1980 return retval;
1981 }
1982
1983 static int cortex_a8_enable_mmu_caches(struct target *target, int mmu,
1984 int d_u_cache, int i_cache)
1985 {
1986 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1987 struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
1988 uint32_t cp15_control;
1989 int retval;
1990
1991 /* read cp15 control register */
1992 retval = armv7a->armv4_5_common.mrc(target, 15,
1993 0, 0, /* op1, op2 */
1994 1, 0, /* CRn, CRm */
1995 &cp15_control);
1996 if (retval != ERROR_OK)
1997 return retval;
1998
1999 if (mmu)
2000 cp15_control |= 0x1U;
2001
2002 if (d_u_cache)
2003 cp15_control |= 0x4U;
2004
2005 if (i_cache)
2006 cp15_control |= 0x1000U;
2007
2008 retval = armv7a->armv4_5_common.mcr(target, 15,
2009 0, 0, /* op1, op2 */
2010 1, 0, /* CRn, CRm */
2011 cp15_control);
2012 return retval;
2013 }
2014
2015
2016 static int cortex_a8_mmu(struct target *target, int *enabled)
2017 {
2018 if (target->state != TARGET_HALTED) {
2019 LOG_ERROR("%s: target not halted", __func__);
2020 return ERROR_TARGET_INVALID;
2021 }
2022
2023 *enabled = target_to_cortex_a8(target)->armv7a_common.armv4_5_mmu.mmu_enabled;
2024 return ERROR_OK;
2025 }
2026
2027 static int cortex_a8_virt2phys(struct target *target,
2028 uint32_t virt, uint32_t *phys)
2029 {
2030 uint32_t cb;
2031 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
2032 // struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
2033 struct armv7a_common *armv7a = target_to_armv7a(target);
2034
2035 /* We assume that virtual address is separated
2036 between user and kernel in Linux style:
2037 0x00000000-0xbfffffff - User space
2038 0xc0000000-0xffffffff - Kernel space */
2039 if( virt < 0xc0000000 ) /* Linux user space */
2040 cortex_a8->current_address_mode = ARM_MODE_USR;
2041 else /* Linux kernel */
2042 cortex_a8->current_address_mode = ARM_MODE_SVC;
2043 uint32_t ret;
2044 int retval = armv4_5_mmu_translate_va(target,
2045 &armv7a->armv4_5_mmu, virt, &cb, &ret);
2046 if (retval != ERROR_OK)
2047 return retval;
2048 /* Reset the flag. We don't want someone else to use it by error */
2049 cortex_a8->current_address_mode = ARM_MODE_ANY;
2050
2051 *phys = ret;
2052 return ERROR_OK;
2053 }
2054
2055 COMMAND_HANDLER(cortex_a8_handle_cache_info_command)
2056 {
2057 struct target *target = get_current_target(CMD_CTX);
2058 struct armv7a_common *armv7a = target_to_armv7a(target);
2059
2060 return armv4_5_handle_cache_info_command(CMD_CTX,
2061 &armv7a->armv4_5_mmu.armv4_5_cache);
2062 }
2063
2064
2065 COMMAND_HANDLER(cortex_a8_handle_dbginit_command)
2066 {
2067 struct target *target = get_current_target(CMD_CTX);
2068 if (!target_was_examined(target))
2069 {
2070 LOG_ERROR("target not examined yet");
2071 return ERROR_FAIL;
2072 }
2073
2074 return cortex_a8_init_debug_access(target);
2075 }
2076
2077 static const struct command_registration cortex_a8_exec_command_handlers[] = {
2078 {
2079 .name = "cache_info",
2080 .handler = cortex_a8_handle_cache_info_command,
2081 .mode = COMMAND_EXEC,
2082 .help = "display information about target caches",
2083 },
2084 {
2085 .name = "dbginit",
2086 .handler = cortex_a8_handle_dbginit_command,
2087 .mode = COMMAND_EXEC,
2088 .help = "Initialize core debug",
2089 },
2090 COMMAND_REGISTRATION_DONE
2091 };
2092 static const struct command_registration cortex_a8_command_handlers[] = {
2093 {
2094 .chain = arm_command_handlers,
2095 },
2096 {
2097 .chain = armv7a_command_handlers,
2098 },
2099 {
2100 .name = "cortex_a8",
2101 .mode = COMMAND_ANY,
2102 .help = "Cortex-A8 command group",
2103 .chain = cortex_a8_exec_command_handlers,
2104 },
2105 COMMAND_REGISTRATION_DONE
2106 };
2107
2108 struct target_type cortexa8_target = {
2109 .name = "cortex_a8",
2110
2111 .poll = cortex_a8_poll,
2112 .arch_state = armv7a_arch_state,
2113
2114 .target_request_data = NULL,
2115
2116 .halt = cortex_a8_halt,
2117 .resume = cortex_a8_resume,
2118 .step = cortex_a8_step,
2119
2120 .assert_reset = cortex_a8_assert_reset,
2121 .deassert_reset = cortex_a8_deassert_reset,
2122 .soft_reset_halt = NULL,
2123
2124 /* REVISIT allow exporting VFP3 registers ... */
2125 .get_gdb_reg_list = arm_get_gdb_reg_list,
2126
2127 .read_memory = cortex_a8_read_memory,
2128 .write_memory = cortex_a8_write_memory,
2129 .bulk_write_memory = cortex_a8_bulk_write_memory,
2130
2131 .checksum_memory = arm_checksum_memory,
2132 .blank_check_memory = arm_blank_check_memory,
2133
2134 .run_algorithm = armv4_5_run_algorithm,
2135
2136 .add_breakpoint = cortex_a8_add_breakpoint,
2137 .remove_breakpoint = cortex_a8_remove_breakpoint,
2138 .add_watchpoint = NULL,
2139 .remove_watchpoint = NULL,
2140
2141 .commands = cortex_a8_command_handlers,
2142 .target_create = cortex_a8_target_create,
2143 .init_target = cortex_a8_init_target,
2144 .examine = cortex_a8_examine,
2145
2146 .read_phys_memory = cortex_a8_read_phys_memory,
2147 .write_phys_memory = cortex_a8_write_phys_memory,
2148 .mmu = cortex_a8_mmu,
2149 .virt2phys = cortex_a8_virt2phys,
2150
2151 };
Marex's Cortex A8 development branch