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Cortex-A8: basic watchpoint support
[openocd/dave.git] / src / target / cortex_a8.c
bloba289d96a6e492a4717b37551dcc912951b4d934d
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 * This program is free software; you can redistribute it and/or modify *
15 * it under the terms of the GNU General Public License as published by *
16 * the Free Software Foundation; either version 2 of the License, or *
17 * (at your option) any later version. *
18 * *
19 * This program is distributed in the hope that it will be useful, *
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
22 * GNU General Public License for more details. *
23 * *
24 * You should have received a copy of the GNU General Public License *
25 * along with this program; if not, write to the *
26 * Free Software Foundation, Inc., *
27 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
28 * *
29 * Cortex-A8(tm) TRM, ARM DDI 0344H *
30 * *
31 ***************************************************************************/
32 #ifdef HAVE_CONFIG_H
33 #include "config.h"
34 #endif
35
36 #include "breakpoints.h"
37 #include "cortex_a8.h"
38 #include "register.h"
39 #include "target_request.h"
40 #include "target_type.h"
41
42 static int cortex_a8_poll(struct target *target);
43 static int cortex_a8_debug_entry(struct target *target);
44 static int cortex_a8_restore_context(struct target *target, bool bpwp);
45 static int cortex_a8_set_breakpoint(struct target *target,
46 struct breakpoint *breakpoint, uint8_t matchmode);
47 static int cortex_a8_unset_breakpoint(struct target *target,
48 struct breakpoint *breakpoint);
49 static int cortex_a8_dap_read_coreregister_u32(struct target *target,
50 uint32_t *value, int regnum);
51 static int cortex_a8_dap_write_coreregister_u32(struct target *target,
52 uint32_t value, int regnum);
53 /*
54 * FIXME do topology discovery using the ROM; don't
55 * assume this is an OMAP3.
56 */
57 #define swjdp_memoryap 0
58 #define swjdp_debugap 1
59 #define OMAP3530_DEBUG_BASE 0x54011000
60
61 /*
62 * Cortex-A8 Basic debug access, very low level assumes state is saved
63 */
64 static int cortex_a8_init_debug_access(struct target *target)
65 {
66 struct armv7a_common *armv7a = target_to_armv7a(target);
67 struct swjdp_common *swjdp = &armv7a->swjdp_info;
68
69 int retval;
70 uint32_t dummy;
71
72 LOG_DEBUG(" ");
73
74 /* Unlocking the debug registers for modification */
75 /* The debugport might be uninitialised so try twice */
76 retval = mem_ap_write_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_LOCKACCESS, 0xC5ACCE55);
77 if (retval != ERROR_OK)
78 mem_ap_write_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_LOCKACCESS, 0xC5ACCE55);
79 /* Clear Sticky Power Down status Bit in PRSR to enable access to
80 the registers in the Core Power Domain */
81 retval = mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_PRSR, &dummy);
82 /* Enabling of instruction execution in debug mode is done in debug_entry code */
83
84 /* Resync breakpoint registers */
85
86 /* Since this is likley called from init or reset, update targtet state information*/
87 cortex_a8_poll(target);
88
89 return retval;
90 }
91
92 /* To reduce needless round-trips, pass in a pointer to the current
93 * DSCR value. Initialize it to zero if you just need to know the
94 * value on return from this function; or (1 << DSCR_INSTR_COMP) if
95 * you happen to know that no instruction is pending.
96 */
97 static int cortex_a8_exec_opcode(struct target *target,
98 uint32_t opcode, uint32_t *dscr_p)
99 {
100 uint32_t dscr;
101 int retval;
102 struct armv7a_common *armv7a = target_to_armv7a(target);
103 struct swjdp_common *swjdp = &armv7a->swjdp_info;
104
105 dscr = dscr_p ? *dscr_p : 0;
106
107 LOG_DEBUG("exec opcode 0x%08" PRIx32, opcode);
108
109 /* Wait for InstrCompl bit to be set */
110 while ((dscr & (1 << DSCR_INSTR_COMP)) == 0)
111 {
112 retval = mem_ap_read_atomic_u32(swjdp,
113 armv7a->debug_base + CPUDBG_DSCR, &dscr);
114 if (retval != ERROR_OK)
115 {
116 LOG_ERROR("Could not read DSCR register, opcode = 0x%08" PRIx32, opcode);
117 return retval;
118 }
119 }
120
121 mem_ap_write_u32(swjdp, armv7a->debug_base + CPUDBG_ITR, opcode);
122
123 do
124 {
125 retval = mem_ap_read_atomic_u32(swjdp,
126 armv7a->debug_base + CPUDBG_DSCR, &dscr);
127 if (retval != ERROR_OK)
128 {
129 LOG_ERROR("Could not read DSCR register");
130 return retval;
131 }
132 }
133 while ((dscr & (1 << DSCR_INSTR_COMP)) == 0); /* Wait for InstrCompl bit to be set */
134
135 if (dscr_p)
136 *dscr_p = dscr;
137
138 return retval;
139 }
140
141 /**************************************************************************
142 Read core register with very few exec_opcode, fast but needs work_area.
143 This can cause problems with MMU active.
144 **************************************************************************/
145 static int cortex_a8_read_regs_through_mem(struct target *target, uint32_t address,
146 uint32_t * regfile)
147 {
148 int retval = ERROR_OK;
149 struct armv7a_common *armv7a = target_to_armv7a(target);
150 struct swjdp_common *swjdp = &armv7a->swjdp_info;
151
152 cortex_a8_dap_read_coreregister_u32(target, regfile, 0);
153 cortex_a8_dap_write_coreregister_u32(target, address, 0);
154 cortex_a8_exec_opcode(target, ARMV4_5_STMIA(0, 0xFFFE, 0, 0), NULL);
155 dap_ap_select(swjdp, swjdp_memoryap);
156 mem_ap_read_buf_u32(swjdp, (uint8_t *)(&regfile[1]), 4*15, address);
157 dap_ap_select(swjdp, swjdp_debugap);
158
159 return retval;
160 }
161
162 static int cortex_a8_dap_read_coreregister_u32(struct target *target,
163 uint32_t *value, int regnum)
164 {
165 int retval = ERROR_OK;
166 uint8_t reg = regnum&0xFF;
167 uint32_t dscr = 0;
168 struct armv7a_common *armv7a = target_to_armv7a(target);
169 struct swjdp_common *swjdp = &armv7a->swjdp_info;
170
171 if (reg > 17)
172 return retval;
173
174 if (reg < 15)
175 {
176 /* Rn to DCCTX, "MCR p14, 0, Rn, c0, c5, 0" 0xEE00nE15 */
177 cortex_a8_exec_opcode(target,
178 ARMV4_5_MCR(14, 0, reg, 0, 5, 0),
179 &dscr);
180 }
181 else if (reg == 15)
182 {
183 /* "MOV r0, r15"; then move r0 to DCCTX */
184 cortex_a8_exec_opcode(target, 0xE1A0000F, &dscr);
185 cortex_a8_exec_opcode(target,
186 ARMV4_5_MCR(14, 0, 0, 0, 5, 0),
187 &dscr);
188 }
189 else
190 {
191 /* "MRS r0, CPSR" or "MRS r0, SPSR"
192 * then move r0 to DCCTX
193 */
194 cortex_a8_exec_opcode(target, ARMV4_5_MRS(0, reg & 1), &dscr);
195 cortex_a8_exec_opcode(target,
196 ARMV4_5_MCR(14, 0, 0, 0, 5, 0),
197 &dscr);
198 }
199
200 /* Wait for DTRRXfull then read DTRRTX */
201 while ((dscr & (1 << DSCR_DTR_TX_FULL)) == 0)
202 {
203 retval = mem_ap_read_atomic_u32(swjdp,
204 armv7a->debug_base + CPUDBG_DSCR, &dscr);
205 }
206
207 retval = mem_ap_read_atomic_u32(swjdp,
208 armv7a->debug_base + CPUDBG_DTRTX, value);
209 LOG_DEBUG("read DCC 0x%08" PRIx32, *value);
210
211 return retval;
212 }
213
214 static int cortex_a8_dap_write_coreregister_u32(struct target *target,
215 uint32_t value, int regnum)
216 {
217 int retval = ERROR_OK;
218 uint8_t Rd = regnum&0xFF;
219 uint32_t dscr;
220 struct armv7a_common *armv7a = target_to_armv7a(target);
221 struct swjdp_common *swjdp = &armv7a->swjdp_info;
222
223 LOG_DEBUG("register %i, value 0x%08" PRIx32, regnum, value);
224
225 /* Check that DCCRX is not full */
226 retval = mem_ap_read_atomic_u32(swjdp,
227 armv7a->debug_base + CPUDBG_DSCR, &dscr);
228 if (dscr & (1 << DSCR_DTR_RX_FULL))
229 {
230 LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr);
231 /* Clear DCCRX with MCR(p14, 0, Rd, c0, c5, 0), opcode 0xEE000E15 */
232 cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
233 &dscr);
234 }
235
236 if (Rd > 17)
237 return retval;
238
239 /* Write DTRRX ... sets DSCR.DTRRXfull but exec_opcode() won't care */
240 LOG_DEBUG("write DCC 0x%08" PRIx32, value);
241 retval = mem_ap_write_u32(swjdp,
242 armv7a->debug_base + CPUDBG_DTRRX, value);
243
244 if (Rd < 15)
245 {
246 /* DCCRX to Rn, "MCR p14, 0, Rn, c0, c5, 0", 0xEE00nE15 */
247 cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, Rd, 0, 5, 0),
248 &dscr);
249 }
250 else if (Rd == 15)
251 {
252 /* DCCRX to R0, "MCR p14, 0, R0, c0, c5, 0", 0xEE000E15
253 * then "mov r15, r0"
254 */
255 cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
256 &dscr);
257 cortex_a8_exec_opcode(target, 0xE1A0F000, &dscr);
258 }
259 else
260 {
261 /* DCCRX to R0, "MCR p14, 0, R0, c0, c5, 0", 0xEE000E15
262 * then "MSR CPSR_cxsf, r0" or "MSR SPSR_cxsf, r0" (all fields)
263 */
264 cortex_a8_exec_opcode(target, ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
265 &dscr);
266 cortex_a8_exec_opcode(target, ARMV4_5_MSR_GP(0, 0xF, Rd & 1),
267 &dscr);
268
269 /* "Prefetch flush" after modifying execution status in CPSR */
270 if (Rd == 16)
271 cortex_a8_exec_opcode(target,
272 ARMV4_5_MCR(15, 0, 0, 7, 5, 4),
273 &dscr);
274 }
275
276 return retval;
277 }
278
279 /* Write to memory mapped registers directly with no cache or mmu handling */
280 static int cortex_a8_dap_write_memap_register_u32(struct target *target, uint32_t address, uint32_t value)
281 {
282 int retval;
283 struct armv7a_common *armv7a = target_to_armv7a(target);
284 struct swjdp_common *swjdp = &armv7a->swjdp_info;
285
286 retval = mem_ap_write_atomic_u32(swjdp, address, value);
287
288 return retval;
289 }
290
291 /*
292 * Cortex-A8 implementation of Debug Programmer's Model
293 *
294 * NOTE the invariant: these routines return with DSCR_INSTR_COMP set,
295 * so there's no need to poll for it before executing an instruction.
296 *
297 * NOTE that in several of these cases the "stall" mode might be useful.
298 * It'd let us queue a few operations together... prepare/finish might
299 * be the places to enable/disable that mode.
300 */
301
302 static inline struct cortex_a8_common *dpm_to_a8(struct arm_dpm *dpm)
303 {
304 return container_of(dpm, struct cortex_a8_common, armv7a_common.dpm);
305 }
306
307 static int cortex_a8_write_dcc(struct cortex_a8_common *a8, uint32_t data)
308 {
309 LOG_DEBUG("write DCC 0x%08" PRIx32, data);
310 return mem_ap_write_u32(&a8->armv7a_common.swjdp_info,
311 a8->armv7a_common.debug_base + CPUDBG_DTRRX, data);
312 }
313
314 static int cortex_a8_read_dcc(struct cortex_a8_common *a8, uint32_t *data,
315 uint32_t *dscr_p)
316 {
317 struct swjdp_common *swjdp = &a8->armv7a_common.swjdp_info;
318 uint32_t dscr = 1 << DSCR_INSTR_COMP;
319 int retval;
320
321 if (dscr_p)
322 dscr = *dscr_p;
323
324 /* Wait for DTRRXfull */
325 while ((dscr & (1 << DSCR_DTR_TX_FULL)) == 0) {
326 retval = mem_ap_read_atomic_u32(swjdp,
327 a8->armv7a_common.debug_base + CPUDBG_DSCR,
328 &dscr);
329 }
330
331 retval = mem_ap_read_atomic_u32(swjdp,
332 a8->armv7a_common.debug_base + CPUDBG_DTRTX, data);
333 //LOG_DEBUG("read DCC 0x%08" PRIx32, *data);
334
335 if (dscr_p)
336 *dscr_p = dscr;
337
338 return retval;
339 }
340
341 static int cortex_a8_dpm_prepare(struct arm_dpm *dpm)
342 {
343 struct cortex_a8_common *a8 = dpm_to_a8(dpm);
344 struct swjdp_common *swjdp = &a8->armv7a_common.swjdp_info;
345 uint32_t dscr;
346 int retval;
347
348 /* set up invariant: INSTR_COMP is set after ever DPM operation */
349 do {
350 retval = mem_ap_read_atomic_u32(swjdp,
351 a8->armv7a_common.debug_base + CPUDBG_DSCR,
352 &dscr);
353 } while ((dscr & (1 << DSCR_INSTR_COMP)) == 0);
354
355 /* this "should never happen" ... */
356 if (dscr & (1 << DSCR_DTR_RX_FULL)) {
357 LOG_ERROR("DSCR_DTR_RX_FULL, dscr 0x%08" PRIx32, dscr);
358 /* Clear DCCRX */
359 retval = cortex_a8_exec_opcode(
360 a8->armv7a_common.armv4_5_common.target,
361 ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
362 &dscr);
363 }
364
365 return retval;
366 }
367
368 static int cortex_a8_dpm_finish(struct arm_dpm *dpm)
369 {
370 /* REVISIT what could be done here? */
371 return ERROR_OK;
372 }
373
374 static int cortex_a8_instr_write_data_dcc(struct arm_dpm *dpm,
375 uint32_t opcode, uint32_t data)
376 {
377 struct cortex_a8_common *a8 = dpm_to_a8(dpm);
378 int retval;
379 uint32_t dscr = 1 << DSCR_INSTR_COMP;
380
381 retval = cortex_a8_write_dcc(a8, data);
382
383 return cortex_a8_exec_opcode(
384 a8->armv7a_common.armv4_5_common.target,
385 opcode,
386 &dscr);
387 }
388
389 static int cortex_a8_instr_write_data_r0(struct arm_dpm *dpm,
390 uint32_t opcode, uint32_t data)
391 {
392 struct cortex_a8_common *a8 = dpm_to_a8(dpm);
393 uint32_t dscr = 1 << DSCR_INSTR_COMP;
394 int retval;
395
396 retval = cortex_a8_write_dcc(a8, data);
397
398 /* DCCRX to R0, "MCR p14, 0, R0, c0, c5, 0", 0xEE000E15 */
399 retval = cortex_a8_exec_opcode(
400 a8->armv7a_common.armv4_5_common.target,
401 ARMV4_5_MRC(14, 0, 0, 0, 5, 0),
402 &dscr);
403
404 /* then the opcode, taking data from R0 */
405 retval = cortex_a8_exec_opcode(
406 a8->armv7a_common.armv4_5_common.target,
407 opcode,
408 &dscr);
409
410 return retval;
411 }
412
413 static int cortex_a8_instr_cpsr_sync(struct arm_dpm *dpm)
414 {
415 struct target *target = dpm->arm->target;
416 uint32_t dscr = 1 << DSCR_INSTR_COMP;
417
418 /* "Prefetch flush" after modifying execution status in CPSR */
419 return cortex_a8_exec_opcode(target,
420 ARMV4_5_MCR(15, 0, 0, 7, 5, 4),
421 &dscr);
422 }
423
424 static int cortex_a8_instr_read_data_dcc(struct arm_dpm *dpm,
425 uint32_t opcode, uint32_t *data)
426 {
427 struct cortex_a8_common *a8 = dpm_to_a8(dpm);
428 int retval;
429 uint32_t dscr = 1 << DSCR_INSTR_COMP;
430
431 /* the opcode, writing data to DCC */
432 retval = cortex_a8_exec_opcode(
433 a8->armv7a_common.armv4_5_common.target,
434 opcode,
435 &dscr);
436
437 return cortex_a8_read_dcc(a8, data, &dscr);
438 }
439
440
441 static int cortex_a8_instr_read_data_r0(struct arm_dpm *dpm,
442 uint32_t opcode, uint32_t *data)
443 {
444 struct cortex_a8_common *a8 = dpm_to_a8(dpm);
445 uint32_t dscr = 1 << DSCR_INSTR_COMP;
446 int retval;
447
448 /* the opcode, writing data to R0 */
449 retval = cortex_a8_exec_opcode(
450 a8->armv7a_common.armv4_5_common.target,
451 opcode,
452 &dscr);
453
454 /* write R0 to DCC */
455 retval = cortex_a8_exec_opcode(
456 a8->armv7a_common.armv4_5_common.target,
457 ARMV4_5_MCR(14, 0, 0, 0, 5, 0),
458 &dscr);
459
460 return cortex_a8_read_dcc(a8, data, &dscr);
461 }
462
463 static int cortex_a8_bpwp_enable(struct arm_dpm *dpm, unsigned index,
464 uint32_t addr, uint32_t control)
465 {
466 struct cortex_a8_common *a8 = dpm_to_a8(dpm);
467 uint32_t vr = a8->armv7a_common.debug_base;
468 uint32_t cr = a8->armv7a_common.debug_base;
469 int retval;
470
471 switch (index) {
472 case 0 ... 15: /* breakpoints */
473 vr += CPUDBG_BVR_BASE;
474 cr += CPUDBG_BCR_BASE;
475 break;
476 case 16 ... 31: /* watchpoints */
477 vr += CPUDBG_WVR_BASE;
478 cr += CPUDBG_WCR_BASE;
479 index -= 16;
480 break;
481 default:
482 return ERROR_FAIL;
483 }
484 vr += 4 * index;
485 cr += 4 * index;
486
487 LOG_DEBUG("A8: bpwp enable, vr %08x cr %08x",
488 (unsigned) vr, (unsigned) cr);
489
490 retval = cortex_a8_dap_write_memap_register_u32(dpm->arm->target,
491 vr, addr);
492 if (retval != ERROR_OK)
493 return retval;
494 retval = cortex_a8_dap_write_memap_register_u32(dpm->arm->target,
495 cr, control);
496 return retval;
497 }
498
499 static int cortex_a8_bpwp_disable(struct arm_dpm *dpm, unsigned index)
500 {
501 struct cortex_a8_common *a8 = dpm_to_a8(dpm);
502 uint32_t cr;
503
504 switch (index) {
505 case 0 ... 15:
506 cr = a8->armv7a_common.debug_base + CPUDBG_BCR_BASE;
507 break;
508 case 16 ... 31:
509 cr = a8->armv7a_common.debug_base + CPUDBG_WCR_BASE;
510 index -= 16;
511 break;
512 default:
513 return ERROR_FAIL;
514 }
515 cr += 4 * index;
516
517 LOG_DEBUG("A8: bpwp disable, cr %08x", (unsigned) cr);
518
519 /* clear control register */
520 return cortex_a8_dap_write_memap_register_u32(dpm->arm->target, cr, 0);
521 }
522
523 static int cortex_a8_dpm_setup(struct cortex_a8_common *a8, uint32_t didr)
524 {
525 struct arm_dpm *dpm = &a8->armv7a_common.dpm;
526
527 dpm->arm = &a8->armv7a_common.armv4_5_common;
528 dpm->didr = didr;
529
530 dpm->prepare = cortex_a8_dpm_prepare;
531 dpm->finish = cortex_a8_dpm_finish;
532
533 dpm->instr_write_data_dcc = cortex_a8_instr_write_data_dcc;
534 dpm->instr_write_data_r0 = cortex_a8_instr_write_data_r0;
535 dpm->instr_cpsr_sync = cortex_a8_instr_cpsr_sync;
536
537 dpm->instr_read_data_dcc = cortex_a8_instr_read_data_dcc;
538 dpm->instr_read_data_r0 = cortex_a8_instr_read_data_r0;
539
540 dpm->bpwp_enable = cortex_a8_bpwp_enable;
541 dpm->bpwp_disable = cortex_a8_bpwp_disable;
542
543 return arm_dpm_setup(dpm);
544 }
545
546
547 /*
548 * Cortex-A8 Run control
549 */
550
551 static int cortex_a8_poll(struct target *target)
552 {
553 int retval = ERROR_OK;
554 uint32_t dscr;
555 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
556 struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
557 struct swjdp_common *swjdp = &armv7a->swjdp_info;
558 enum target_state prev_target_state = target->state;
559 uint8_t saved_apsel = dap_ap_get_select(swjdp);
560
561 dap_ap_select(swjdp, swjdp_debugap);
562 retval = mem_ap_read_atomic_u32(swjdp,
563 armv7a->debug_base + CPUDBG_DSCR, &dscr);
564 if (retval != ERROR_OK)
565 {
566 dap_ap_select(swjdp, saved_apsel);
567 return retval;
568 }
569 cortex_a8->cpudbg_dscr = dscr;
570
571 if ((dscr & 0x3) == 0x3)
572 {
573 if (prev_target_state != TARGET_HALTED)
574 {
575 /* We have a halting debug event */
576 LOG_DEBUG("Target halted");
577 target->state = TARGET_HALTED;
578 if ((prev_target_state == TARGET_RUNNING)
579 || (prev_target_state == TARGET_RESET))
580 {
581 retval = cortex_a8_debug_entry(target);
582 if (retval != ERROR_OK)
583 return retval;
584
585 target_call_event_callbacks(target,
586 TARGET_EVENT_HALTED);
587 }
588 if (prev_target_state == TARGET_DEBUG_RUNNING)
589 {
590 LOG_DEBUG(" ");
591
592 retval = cortex_a8_debug_entry(target);
593 if (retval != ERROR_OK)
594 return retval;
595
596 target_call_event_callbacks(target,
597 TARGET_EVENT_DEBUG_HALTED);
598 }
599 }
600 }
601 else if ((dscr & 0x3) == 0x2)
602 {
603 target->state = TARGET_RUNNING;
604 }
605 else
606 {
607 LOG_DEBUG("Unknown target state dscr = 0x%08" PRIx32, dscr);
608 target->state = TARGET_UNKNOWN;
609 }
610
611 dap_ap_select(swjdp, saved_apsel);
612
613 return retval;
614 }
615
616 static int cortex_a8_halt(struct target *target)
617 {
618 int retval = ERROR_OK;
619 uint32_t dscr;
620 struct armv7a_common *armv7a = target_to_armv7a(target);
621 struct swjdp_common *swjdp = &armv7a->swjdp_info;
622 uint8_t saved_apsel = dap_ap_get_select(swjdp);
623 dap_ap_select(swjdp, swjdp_debugap);
624
625 /*
626 * Tell the core to be halted by writing DRCR with 0x1
627 * and then wait for the core to be halted.
628 */
629 retval = mem_ap_write_atomic_u32(swjdp,
630 armv7a->debug_base + CPUDBG_DRCR, 0x1);
631
632 /*
633 * enter halting debug mode
634 */
635 mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DSCR, &dscr);
636 retval = mem_ap_write_atomic_u32(swjdp,
637 armv7a->debug_base + CPUDBG_DSCR, dscr | (1 << DSCR_HALT_DBG_MODE));
638
639 if (retval != ERROR_OK)
640 goto out;
641
642 do {
643 mem_ap_read_atomic_u32(swjdp,
644 armv7a->debug_base + CPUDBG_DSCR, &dscr);
645 } while ((dscr & (1 << DSCR_CORE_HALTED)) == 0);
646
647 target->debug_reason = DBG_REASON_DBGRQ;
648
649 out:
650 dap_ap_select(swjdp, saved_apsel);
651 return retval;
652 }
653
654 static int cortex_a8_resume(struct target *target, int current,
655 uint32_t address, int handle_breakpoints, int debug_execution)
656 {
657 struct armv7a_common *armv7a = target_to_armv7a(target);
658 struct arm *armv4_5 = &armv7a->armv4_5_common;
659 struct swjdp_common *swjdp = &armv7a->swjdp_info;
660
661 // struct breakpoint *breakpoint = NULL;
662 uint32_t resume_pc, dscr;
663
664 uint8_t saved_apsel = dap_ap_get_select(swjdp);
665 dap_ap_select(swjdp, swjdp_debugap);
666
667 if (!debug_execution)
668 target_free_all_working_areas(target);
669
670 #if 0
671 if (debug_execution)
672 {
673 /* Disable interrupts */
674 /* We disable interrupts in the PRIMASK register instead of
675 * masking with C_MASKINTS,
676 * This is probably the same issue as Cortex-M3 Errata 377493:
677 * C_MASKINTS in parallel with disabled interrupts can cause
678 * local faults to not be taken. */
679 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_PRIMASK].value, 0, 32, 1);
680 armv7m->core_cache->reg_list[ARMV7M_PRIMASK].dirty = 1;
681 armv7m->core_cache->reg_list[ARMV7M_PRIMASK].valid = 1;
682
683 /* Make sure we are in Thumb mode */
684 buf_set_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32,
685 buf_get_u32(armv7m->core_cache->reg_list[ARMV7M_xPSR].value, 0, 32) | (1 << 24));
686 armv7m->core_cache->reg_list[ARMV7M_xPSR].dirty = 1;
687 armv7m->core_cache->reg_list[ARMV7M_xPSR].valid = 1;
688 }
689 #endif
690
691 /* current = 1: continue on current pc, otherwise continue at <address> */
692 resume_pc = buf_get_u32(
693 armv4_5->core_cache->reg_list[15].value,
694 0, 32);
695 if (!current)
696 resume_pc = address;
697
698 /* Make sure that the Armv7 gdb thumb fixups does not
699 * kill the return address
700 */
701 switch (armv4_5->core_state)
702 {
703 case ARMV4_5_STATE_ARM:
704 resume_pc &= 0xFFFFFFFC;
705 break;
706 case ARMV4_5_STATE_THUMB:
707 case ARM_STATE_THUMB_EE:
708 /* When the return address is loaded into PC
709 * bit 0 must be 1 to stay in Thumb state
710 */
711 resume_pc |= 0x1;
712 break;
713 case ARMV4_5_STATE_JAZELLE:
714 LOG_ERROR("How do I resume into Jazelle state??");
715 return ERROR_FAIL;
716 }
717 LOG_DEBUG("resume pc = 0x%08" PRIx32, resume_pc);
718 buf_set_u32(armv4_5->core_cache->reg_list[15].value,
719 0, 32, resume_pc);
720 armv4_5->core_cache->reg_list[15].dirty = 1;
721 armv4_5->core_cache->reg_list[15].valid = 1;
722
723 cortex_a8_restore_context(target, handle_breakpoints);
724
725 #if 0
726 /* the front-end may request us not to handle breakpoints */
727 if (handle_breakpoints)
728 {
729 /* Single step past breakpoint at current address */
730 if ((breakpoint = breakpoint_find(target, resume_pc)))
731 {
732 LOG_DEBUG("unset breakpoint at 0x%8.8x", breakpoint->address);
733 cortex_m3_unset_breakpoint(target, breakpoint);
734 cortex_m3_single_step_core(target);
735 cortex_m3_set_breakpoint(target, breakpoint);
736 }
737 }
738
739 #endif
740 /* Restart core and wait for it to be started */
741 mem_ap_write_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_DRCR, 0x2);
742
743 do {
744 mem_ap_read_atomic_u32(swjdp,
745 armv7a->debug_base + CPUDBG_DSCR, &dscr);
746 } while ((dscr & (1 << DSCR_CORE_RESTARTED)) == 0);
747
748 target->debug_reason = DBG_REASON_NOTHALTED;
749 target->state = TARGET_RUNNING;
750
751 /* registers are now invalid */
752 register_cache_invalidate(armv4_5->core_cache);
753
754 if (!debug_execution)
755 {
756 target->state = TARGET_RUNNING;
757 target_call_event_callbacks(target, TARGET_EVENT_RESUMED);
758 LOG_DEBUG("target resumed at 0x%" PRIx32, resume_pc);
759 }
760 else
761 {
762 target->state = TARGET_DEBUG_RUNNING;
763 target_call_event_callbacks(target, TARGET_EVENT_DEBUG_RESUMED);
764 LOG_DEBUG("target debug resumed at 0x%" PRIx32, resume_pc);
765 }
766
767 dap_ap_select(swjdp, saved_apsel);
768
769 return ERROR_OK;
770 }
771
772 static int cortex_a8_debug_entry(struct target *target)
773 {
774 int i;
775 uint32_t regfile[16], pc, cpsr, dscr;
776 int retval = ERROR_OK;
777 struct working_area *regfile_working_area = NULL;
778 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
779 struct armv7a_common *armv7a = target_to_armv7a(target);
780 struct arm *armv4_5 = &armv7a->armv4_5_common;
781 struct swjdp_common *swjdp = &armv7a->swjdp_info;
782 struct reg *reg;
783
784 LOG_DEBUG("dscr = 0x%08" PRIx32, cortex_a8->cpudbg_dscr);
785
786 /* Enable the ITR execution once we are in debug mode */
787 mem_ap_read_atomic_u32(swjdp,
788 armv7a->debug_base + CPUDBG_DSCR, &dscr);
789
790 /* REVISIT see A8 TRM 12.11.4 steps 2..3 -- make sure that any
791 * imprecise data aborts get discarded by issuing a Data
792 * Synchronization Barrier: ARMV4_5_MCR(15, 0, 0, 7, 10, 4).
793 */
794
795 dscr |= (1 << DSCR_EXT_INT_EN);
796 retval = mem_ap_write_atomic_u32(swjdp,
797 armv7a->debug_base + CPUDBG_DSCR, dscr);
798
799 /* Examine debug reason */
800 switch ((cortex_a8->cpudbg_dscr >> 2)&0xF)
801 {
802 case 0: /* DRCR[0] write */
803 case 4: /* EDBGRQ */
804 target->debug_reason = DBG_REASON_DBGRQ;
805 break;
806 case 1: /* HW breakpoint */
807 case 3: /* SW BKPT */
808 case 5: /* vector catch */
809 target->debug_reason = DBG_REASON_BREAKPOINT;
810 break;
811 case 2: /* asynch watchpoint */
812 case 10: /* precise watchpoint */
813 target->debug_reason = DBG_REASON_WATCHPOINT;
814 /* REVISIT could collect WFAR later, to see just
815 * which instruction triggered the watchpoint.
816 */
817 break;
818 default:
819 target->debug_reason = DBG_REASON_UNDEFINED;
820 break;
821 }
822
823 /* REVISIT fast_reg_read is never set ... */
824
825 /* Examine target state and mode */
826 if (cortex_a8->fast_reg_read)
827 target_alloc_working_area(target, 64, &regfile_working_area);
828
829 /* First load register acessible through core debug port*/
830 if (!regfile_working_area)
831 {
832 retval = arm_dpm_read_current_registers(&armv7a->dpm);
833 }
834 else
835 {
836 dap_ap_select(swjdp, swjdp_memoryap);
837 cortex_a8_read_regs_through_mem(target,
838 regfile_working_area->address, regfile);
839 dap_ap_select(swjdp, swjdp_memoryap);
840 target_free_working_area(target, regfile_working_area);
841
842 /* read Current PSR */
843 cortex_a8_dap_read_coreregister_u32(target, &cpsr, 16);
844 pc = regfile[15];
845 dap_ap_select(swjdp, swjdp_debugap);
846 LOG_DEBUG("cpsr: %8.8" PRIx32, cpsr);
847
848 arm_set_cpsr(armv4_5, cpsr);
849
850 /* update cache */
851 for (i = 0; i <= ARM_PC; i++)
852 {
853 reg = arm_reg_current(armv4_5, i);
854
855 buf_set_u32(reg->value, 0, 32, regfile[i]);
856 reg->valid = 1;
857 reg->dirty = 0;
858 }
859
860 /* Fixup PC Resume Address */
861 if (cpsr & (1 << 5))
862 {
863 // T bit set for Thumb or ThumbEE state
864 regfile[ARM_PC] -= 4;
865 }
866 else
867 {
868 // ARM state
869 regfile[ARM_PC] -= 8;
870 }
871
872 reg = armv4_5->core_cache->reg_list + 15;
873 buf_set_u32(reg->value, 0, 32, regfile[ARM_PC]);
874 reg->dirty = reg->valid;
875 }
876
877 #if 0
878 /* TODO, Move this */
879 uint32_t cp15_control_register, cp15_cacr, cp15_nacr;
880 cortex_a8_read_cp(target, &cp15_control_register, 15, 0, 1, 0, 0);
881 LOG_DEBUG("cp15_control_register = 0x%08x", cp15_control_register);
882
883 cortex_a8_read_cp(target, &cp15_cacr, 15, 0, 1, 0, 2);
884 LOG_DEBUG("cp15 Coprocessor Access Control Register = 0x%08x", cp15_cacr);
885
886 cortex_a8_read_cp(target, &cp15_nacr, 15, 0, 1, 1, 2);
887 LOG_DEBUG("cp15 Nonsecure Access Control Register = 0x%08x", cp15_nacr);
888 #endif
889
890 /* Are we in an exception handler */
891 // armv4_5->exception_number = 0;
892 if (armv7a->post_debug_entry)
893 armv7a->post_debug_entry(target);
894
895
896
897 return retval;
898
899 }
900
901 static void cortex_a8_post_debug_entry(struct target *target)
902 {
903 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
904 struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
905 int retval;
906
907 /* MRC p15,0,<Rt>,c1,c0,0 ; Read CP15 System Control Register */
908 retval = armv7a->armv4_5_common.mrc(target, 15,
909 0, 0, /* op1, op2 */
910 1, 0, /* CRn, CRm */
911 &cortex_a8->cp15_control_reg);
912 LOG_DEBUG("cp15_control_reg: %8.8" PRIx32, cortex_a8->cp15_control_reg);
913
914 if (armv7a->armv4_5_mmu.armv4_5_cache.ctype == -1)
915 {
916 uint32_t cache_type_reg;
917
918 /* MRC p15,0,<Rt>,c0,c0,1 ; Read CP15 Cache Type Register */
919 retval = armv7a->armv4_5_common.mrc(target, 15,
920 0, 1, /* op1, op2 */
921 0, 0, /* CRn, CRm */
922 &cache_type_reg);
923 LOG_DEBUG("cp15 cache type: %8.8x", (unsigned) cache_type_reg);
924
925 /* FIXME the armv4_4 cache info DOES NOT APPLY to Cortex-A8 */
926 armv4_5_identify_cache(cache_type_reg,
927 &armv7a->armv4_5_mmu.armv4_5_cache);
928 }
929
930 armv7a->armv4_5_mmu.mmu_enabled =
931 (cortex_a8->cp15_control_reg & 0x1U) ? 1 : 0;
932 armv7a->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled =
933 (cortex_a8->cp15_control_reg & 0x4U) ? 1 : 0;
934 armv7a->armv4_5_mmu.armv4_5_cache.i_cache_enabled =
935 (cortex_a8->cp15_control_reg & 0x1000U) ? 1 : 0;
936
937
938 }
939
940 static int cortex_a8_step(struct target *target, int current, uint32_t address,
941 int handle_breakpoints)
942 {
943 struct armv7a_common *armv7a = target_to_armv7a(target);
944 struct arm *armv4_5 = &armv7a->armv4_5_common;
945 struct breakpoint *breakpoint = NULL;
946 struct breakpoint stepbreakpoint;
947 struct reg *r;
948
949 int timeout = 100;
950
951 if (target->state != TARGET_HALTED)
952 {
953 LOG_WARNING("target not halted");
954 return ERROR_TARGET_NOT_HALTED;
955 }
956
957 /* current = 1: continue on current pc, otherwise continue at <address> */
958 r = armv4_5->core_cache->reg_list + 15;
959 if (!current)
960 {
961 buf_set_u32(r->value, 0, 32, address);
962 }
963 else
964 {
965 address = buf_get_u32(r->value, 0, 32);
966 }
967
968 /* The front-end may request us not to handle breakpoints.
969 * But since Cortex-A8 uses breakpoint for single step,
970 * we MUST handle breakpoints.
971 */
972 handle_breakpoints = 1;
973 if (handle_breakpoints) {
974 breakpoint = breakpoint_find(target, address);
975 if (breakpoint)
976 cortex_a8_unset_breakpoint(target, breakpoint);
977 }
978
979 /* Setup single step breakpoint */
980 stepbreakpoint.address = address;
981 stepbreakpoint.length = (armv4_5->core_state == ARMV4_5_STATE_THUMB)
982 ? 2 : 4;
983 stepbreakpoint.type = BKPT_HARD;
984 stepbreakpoint.set = 0;
985
986 /* Break on IVA mismatch */
987 cortex_a8_set_breakpoint(target, &stepbreakpoint, 0x04);
988
989 target->debug_reason = DBG_REASON_SINGLESTEP;
990
991 cortex_a8_resume(target, 1, address, 0, 0);
992
993 while (target->state != TARGET_HALTED)
994 {
995 cortex_a8_poll(target);
996 if (--timeout == 0)
997 {
998 LOG_WARNING("timeout waiting for target halt");
999 break;
1000 }
1001 }
1002
1003 cortex_a8_unset_breakpoint(target, &stepbreakpoint);
1004 if (timeout > 0) target->debug_reason = DBG_REASON_BREAKPOINT;
1005
1006 if (breakpoint)
1007 cortex_a8_set_breakpoint(target, breakpoint, 0);
1008
1009 if (target->state != TARGET_HALTED)
1010 LOG_DEBUG("target stepped");
1011
1012 return ERROR_OK;
1013 }
1014
1015 static int cortex_a8_restore_context(struct target *target, bool bpwp)
1016 {
1017 struct armv7a_common *armv7a = target_to_armv7a(target);
1018
1019 LOG_DEBUG(" ");
1020
1021 if (armv7a->pre_restore_context)
1022 armv7a->pre_restore_context(target);
1023
1024 arm_dpm_write_dirty_registers(&armv7a->dpm, bpwp);
1025
1026 if (armv7a->post_restore_context)
1027 armv7a->post_restore_context(target);
1028
1029 return ERROR_OK;
1030 }
1031
1032
1033 /*
1034 * Cortex-A8 Breakpoint and watchpoint fuctions
1035 */
1036
1037 /* Setup hardware Breakpoint Register Pair */
1038 static int cortex_a8_set_breakpoint(struct target *target,
1039 struct breakpoint *breakpoint, uint8_t matchmode)
1040 {
1041 int retval;
1042 int brp_i=0;
1043 uint32_t control;
1044 uint8_t byte_addr_select = 0x0F;
1045 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1046 struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
1047 struct cortex_a8_brp * brp_list = cortex_a8->brp_list;
1048
1049 if (breakpoint->set)
1050 {
1051 LOG_WARNING("breakpoint already set");
1052 return ERROR_OK;
1053 }
1054
1055 if (breakpoint->type == BKPT_HARD)
1056 {
1057 while (brp_list[brp_i].used && (brp_i < cortex_a8->brp_num))
1058 brp_i++ ;
1059 if (brp_i >= cortex_a8->brp_num)
1060 {
1061 LOG_ERROR("ERROR Can not find free Breakpoint Register Pair");
1062 return ERROR_FAIL;
1063 }
1064 breakpoint->set = brp_i + 1;
1065 if (breakpoint->length == 2)
1066 {
1067 byte_addr_select = (3 << (breakpoint->address & 0x02));
1068 }
1069 control = ((matchmode & 0x7) << 20)
1070 | (byte_addr_select << 5)
1071 | (3 << 1) | 1;
1072 brp_list[brp_i].used = 1;
1073 brp_list[brp_i].value = (breakpoint->address & 0xFFFFFFFC);
1074 brp_list[brp_i].control = control;
1075 cortex_a8_dap_write_memap_register_u32(target, armv7a->debug_base
1076 + CPUDBG_BVR_BASE + 4 * brp_list[brp_i].BRPn,
1077 brp_list[brp_i].value);
1078 cortex_a8_dap_write_memap_register_u32(target, armv7a->debug_base
1079 + CPUDBG_BCR_BASE + 4 * brp_list[brp_i].BRPn,
1080 brp_list[brp_i].control);
1081 LOG_DEBUG("brp %i control 0x%0" PRIx32 " value 0x%0" PRIx32, brp_i,
1082 brp_list[brp_i].control,
1083 brp_list[brp_i].value);
1084 }
1085 else if (breakpoint->type == BKPT_SOFT)
1086 {
1087 uint8_t code[4];
1088 if (breakpoint->length == 2)
1089 {
1090 buf_set_u32(code, 0, 32, ARMV5_T_BKPT(0x11));
1091 }
1092 else
1093 {
1094 buf_set_u32(code, 0, 32, ARMV5_BKPT(0x11));
1095 }
1096 retval = target->type->read_memory(target,
1097 breakpoint->address & 0xFFFFFFFE,
1098 breakpoint->length, 1,
1099 breakpoint->orig_instr);
1100 if (retval != ERROR_OK)
1101 return retval;
1102 retval = target->type->write_memory(target,
1103 breakpoint->address & 0xFFFFFFFE,
1104 breakpoint->length, 1, code);
1105 if (retval != ERROR_OK)
1106 return retval;
1107 breakpoint->set = 0x11; /* Any nice value but 0 */
1108 }
1109
1110 return ERROR_OK;
1111 }
1112
1113 static int cortex_a8_unset_breakpoint(struct target *target, struct breakpoint *breakpoint)
1114 {
1115 int retval;
1116 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1117 struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
1118 struct cortex_a8_brp * brp_list = cortex_a8->brp_list;
1119
1120 if (!breakpoint->set)
1121 {
1122 LOG_WARNING("breakpoint not set");
1123 return ERROR_OK;
1124 }
1125
1126 if (breakpoint->type == BKPT_HARD)
1127 {
1128 int brp_i = breakpoint->set - 1;
1129 if ((brp_i < 0) || (brp_i >= cortex_a8->brp_num))
1130 {
1131 LOG_DEBUG("Invalid BRP number in breakpoint");
1132 return ERROR_OK;
1133 }
1134 LOG_DEBUG("rbp %i control 0x%0" PRIx32 " value 0x%0" PRIx32, brp_i,
1135 brp_list[brp_i].control, brp_list[brp_i].value);
1136 brp_list[brp_i].used = 0;
1137 brp_list[brp_i].value = 0;
1138 brp_list[brp_i].control = 0;
1139 cortex_a8_dap_write_memap_register_u32(target, armv7a->debug_base
1140 + CPUDBG_BCR_BASE + 4 * brp_list[brp_i].BRPn,
1141 brp_list[brp_i].control);
1142 cortex_a8_dap_write_memap_register_u32(target, armv7a->debug_base
1143 + CPUDBG_BVR_BASE + 4 * brp_list[brp_i].BRPn,
1144 brp_list[brp_i].value);
1145 }
1146 else
1147 {
1148 /* restore original instruction (kept in target endianness) */
1149 if (breakpoint->length == 4)
1150 {
1151 retval = target->type->write_memory(target,
1152 breakpoint->address & 0xFFFFFFFE,
1153 4, 1, breakpoint->orig_instr);
1154 if (retval != ERROR_OK)
1155 return retval;
1156 }
1157 else
1158 {
1159 retval = target->type->write_memory(target,
1160 breakpoint->address & 0xFFFFFFFE,
1161 2, 1, breakpoint->orig_instr);
1162 if (retval != ERROR_OK)
1163 return retval;
1164 }
1165 }
1166 breakpoint->set = 0;
1167
1168 return ERROR_OK;
1169 }
1170
1171 static int cortex_a8_add_breakpoint(struct target *target,
1172 struct breakpoint *breakpoint)
1173 {
1174 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1175
1176 if ((breakpoint->type == BKPT_HARD) && (cortex_a8->brp_num_available < 1))
1177 {
1178 LOG_INFO("no hardware breakpoint available");
1179 return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
1180 }
1181
1182 if (breakpoint->type == BKPT_HARD)
1183 cortex_a8->brp_num_available--;
1184 cortex_a8_set_breakpoint(target, breakpoint, 0x00); /* Exact match */
1185
1186 return ERROR_OK;
1187 }
1188
1189 static int cortex_a8_remove_breakpoint(struct target *target, struct breakpoint *breakpoint)
1190 {
1191 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1192
1193 #if 0
1194 /* It is perfectly possible to remove brakpoints while the taget is running */
1195 if (target->state != TARGET_HALTED)
1196 {
1197 LOG_WARNING("target not halted");
1198 return ERROR_TARGET_NOT_HALTED;
1199 }
1200 #endif
1201
1202 if (breakpoint->set)
1203 {
1204 cortex_a8_unset_breakpoint(target, breakpoint);
1205 if (breakpoint->type == BKPT_HARD)
1206 cortex_a8->brp_num_available++ ;
1207 }
1208
1209
1210 return ERROR_OK;
1211 }
1212
1213
1214
1215 /*
1216 * Cortex-A8 Reset fuctions
1217 */
1218
1219 static int cortex_a8_assert_reset(struct target *target)
1220 {
1221 struct armv7a_common *armv7a = target_to_armv7a(target);
1222
1223 LOG_DEBUG(" ");
1224
1225 /* FIXME when halt is requested, make it work somehow... */
1226
1227 /* Issue some kind of warm reset. */
1228 if (target_has_event_action(target, TARGET_EVENT_RESET_ASSERT)) {
1229 target_handle_event(target, TARGET_EVENT_RESET_ASSERT);
1230 } else if (jtag_get_reset_config() & RESET_HAS_SRST) {
1231 /* REVISIT handle "pulls" cases, if there's
1232 * hardware that needs them to work.
1233 */
1234 jtag_add_reset(0, 1);
1235 } else {
1236 LOG_ERROR("%s: how to reset?", target_name(target));
1237 return ERROR_FAIL;
1238 }
1239
1240 /* registers are now invalid */
1241 register_cache_invalidate(armv7a->armv4_5_common.core_cache);
1242
1243 target->state = TARGET_RESET;
1244
1245 return ERROR_OK;
1246 }
1247
1248 static int cortex_a8_deassert_reset(struct target *target)
1249 {
1250 int retval;
1251
1252 LOG_DEBUG(" ");
1253
1254 /* be certain SRST is off */
1255 jtag_add_reset(0, 0);
1256
1257 retval = cortex_a8_poll(target);
1258
1259 if (target->reset_halt) {
1260 if (target->state != TARGET_HALTED) {
1261 LOG_WARNING("%s: ran after reset and before halt ...",
1262 target_name(target));
1263 if ((retval = target_halt(target)) != ERROR_OK)
1264 return retval;
1265 }
1266 }
1267
1268 return ERROR_OK;
1269 }
1270
1271 /*
1272 * Cortex-A8 Memory access
1273 *
1274 * This is same Cortex M3 but we must also use the correct
1275 * ap number for every access.
1276 */
1277
1278 static int cortex_a8_read_memory(struct target *target, uint32_t address,
1279 uint32_t size, uint32_t count, uint8_t *buffer)
1280 {
1281 struct armv7a_common *armv7a = target_to_armv7a(target);
1282 struct swjdp_common *swjdp = &armv7a->swjdp_info;
1283 int retval = ERROR_INVALID_ARGUMENTS;
1284
1285 /* cortex_a8 handles unaligned memory access */
1286
1287 // ??? dap_ap_select(swjdp, swjdp_memoryap);
1288
1289 if (count && buffer) {
1290 switch (size) {
1291 case 4:
1292 retval = mem_ap_read_buf_u32(swjdp, buffer, 4 * count, address);
1293 break;
1294 case 2:
1295 retval = mem_ap_read_buf_u16(swjdp, buffer, 2 * count, address);
1296 break;
1297 case 1:
1298 retval = mem_ap_read_buf_u8(swjdp, buffer, count, address);
1299 break;
1300 }
1301 }
1302
1303 return retval;
1304 }
1305
1306 static int cortex_a8_write_memory(struct target *target, uint32_t address,
1307 uint32_t size, uint32_t count, uint8_t *buffer)
1308 {
1309 struct armv7a_common *armv7a = target_to_armv7a(target);
1310 struct swjdp_common *swjdp = &armv7a->swjdp_info;
1311 int retval = ERROR_INVALID_ARGUMENTS;
1312
1313 // ??? dap_ap_select(swjdp, swjdp_memoryap);
1314
1315 if (count && buffer) {
1316 switch (size) {
1317 case 4:
1318 retval = mem_ap_write_buf_u32(swjdp, buffer, 4 * count, address);
1319 break;
1320 case 2:
1321 retval = mem_ap_write_buf_u16(swjdp, buffer, 2 * count, address);
1322 break;
1323 case 1:
1324 retval = mem_ap_write_buf_u8(swjdp, buffer, count, address);
1325 break;
1326 }
1327 }
1328
1329 /* REVISIT this op is generic ARMv7-A/R stuff */
1330 if (retval == ERROR_OK && target->state == TARGET_HALTED)
1331 {
1332 struct arm_dpm *dpm = armv7a->armv4_5_common.dpm;
1333
1334 retval = dpm->prepare(dpm);
1335 if (retval != ERROR_OK)
1336 return retval;
1337
1338 /* The Cache handling will NOT work with MMU active, the
1339 * wrong addresses will be invalidated!
1340 *
1341 * For both ICache and DCache, walk all cache lines in the
1342 * address range. Cortex-A8 has fixed 64 byte line length.
1343 *
1344 * REVISIT per ARMv7, these may trigger watchpoints ...
1345 */
1346
1347 /* invalidate I-Cache */
1348 if (armv7a->armv4_5_mmu.armv4_5_cache.i_cache_enabled)
1349 {
1350 /* ICIMVAU - Invalidate Cache single entry
1351 * with MVA to PoU
1352 * MCR p15, 0, r0, c7, c5, 1
1353 */
1354 for (uint32_t cacheline = address;
1355 cacheline < address + size * count;
1356 cacheline += 64) {
1357 retval = dpm->instr_write_data_r0(dpm,
1358 ARMV4_5_MCR(15, 0, 0, 7, 5, 1),
1359 cacheline);
1360 }
1361 }
1362
1363 /* invalidate D-Cache */
1364 if (armv7a->armv4_5_mmu.armv4_5_cache.d_u_cache_enabled)
1365 {
1366 /* DCIMVAC - Invalidate data Cache line
1367 * with MVA to PoC
1368 * MCR p15, 0, r0, c7, c6, 1
1369 */
1370 for (uint32_t cacheline = address;
1371 cacheline < address + size * count;
1372 cacheline += 64) {
1373 retval = dpm->instr_write_data_r0(dpm,
1374 ARMV4_5_MCR(15, 0, 0, 7, 6, 1),
1375 cacheline);
1376 }
1377 }
1378
1379 /* (void) */ dpm->finish(dpm);
1380 }
1381
1382 return retval;
1383 }
1384
1385 static int cortex_a8_bulk_write_memory(struct target *target, uint32_t address,
1386 uint32_t count, uint8_t *buffer)
1387 {
1388 return cortex_a8_write_memory(target, address, 4, count, buffer);
1389 }
1390
1391
1392 static int cortex_a8_dcc_read(struct swjdp_common *swjdp, uint8_t *value, uint8_t *ctrl)
1393 {
1394 #if 0
1395 u16 dcrdr;
1396
1397 mem_ap_read_buf_u16(swjdp, (uint8_t*)&dcrdr, 1, DCB_DCRDR);
1398 *ctrl = (uint8_t)dcrdr;
1399 *value = (uint8_t)(dcrdr >> 8);
1400
1401 LOG_DEBUG("data 0x%x ctrl 0x%x", *value, *ctrl);
1402
1403 /* write ack back to software dcc register
1404 * signify we have read data */
1405 if (dcrdr & (1 << 0))
1406 {
1407 dcrdr = 0;
1408 mem_ap_write_buf_u16(swjdp, (uint8_t*)&dcrdr, 1, DCB_DCRDR);
1409 }
1410 #endif
1411 return ERROR_OK;
1412 }
1413
1414
1415 static int cortex_a8_handle_target_request(void *priv)
1416 {
1417 struct target *target = priv;
1418 struct armv7a_common *armv7a = target_to_armv7a(target);
1419 struct swjdp_common *swjdp = &armv7a->swjdp_info;
1420
1421 if (!target_was_examined(target))
1422 return ERROR_OK;
1423 if (!target->dbg_msg_enabled)
1424 return ERROR_OK;
1425
1426 if (target->state == TARGET_RUNNING)
1427 {
1428 uint8_t data = 0;
1429 uint8_t ctrl = 0;
1430
1431 cortex_a8_dcc_read(swjdp, &data, &ctrl);
1432
1433 /* check if we have data */
1434 if (ctrl & (1 << 0))
1435 {
1436 uint32_t request;
1437
1438 /* we assume target is quick enough */
1439 request = data;
1440 cortex_a8_dcc_read(swjdp, &data, &ctrl);
1441 request |= (data << 8);
1442 cortex_a8_dcc_read(swjdp, &data, &ctrl);
1443 request |= (data << 16);
1444 cortex_a8_dcc_read(swjdp, &data, &ctrl);
1445 request |= (data << 24);
1446 target_request(target, request);
1447 }
1448 }
1449
1450 return ERROR_OK;
1451 }
1452
1453 /*
1454 * Cortex-A8 target information and configuration
1455 */
1456
1457 static int cortex_a8_examine_first(struct target *target)
1458 {
1459 struct cortex_a8_common *cortex_a8 = target_to_cortex_a8(target);
1460 struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
1461 struct swjdp_common *swjdp = &armv7a->swjdp_info;
1462 int i;
1463 int retval = ERROR_OK;
1464 uint32_t didr, ctypr, ttypr, cpuid;
1465
1466 LOG_DEBUG("TODO");
1467
1468 /* Here we shall insert a proper ROM Table scan */
1469 armv7a->debug_base = OMAP3530_DEBUG_BASE;
1470
1471 /* We do one extra read to ensure DAP is configured,
1472 * we call ahbap_debugport_init(swjdp) instead
1473 */
1474 ahbap_debugport_init(swjdp);
1475 mem_ap_read_atomic_u32(swjdp, armv7a->debug_base + CPUDBG_CPUID, &cpuid);
1476 if ((retval = mem_ap_read_atomic_u32(swjdp,
1477 armv7a->debug_base + CPUDBG_CPUID, &cpuid)) != ERROR_OK)
1478 {
1479 LOG_DEBUG("Examine failed");
1480 return retval;
1481 }
1482
1483 if ((retval = mem_ap_read_atomic_u32(swjdp,
1484 armv7a->debug_base + CPUDBG_CTYPR, &ctypr)) != ERROR_OK)
1485 {
1486 LOG_DEBUG("Examine failed");
1487 return retval;
1488 }
1489
1490 if ((retval = mem_ap_read_atomic_u32(swjdp,
1491 armv7a->debug_base + CPUDBG_TTYPR, &ttypr)) != ERROR_OK)
1492 {
1493 LOG_DEBUG("Examine failed");
1494 return retval;
1495 }
1496
1497 if ((retval = mem_ap_read_atomic_u32(swjdp,
1498 armv7a->debug_base + CPUDBG_DIDR, &didr)) != ERROR_OK)
1499 {
1500 LOG_DEBUG("Examine failed");
1501 return retval;
1502 }
1503
1504 LOG_DEBUG("cpuid = 0x%08" PRIx32, cpuid);
1505 LOG_DEBUG("ctypr = 0x%08" PRIx32, ctypr);
1506 LOG_DEBUG("ttypr = 0x%08" PRIx32, ttypr);
1507 LOG_DEBUG("didr = 0x%08" PRIx32, didr);
1508
1509 armv7a->armv4_5_common.core_type = ARM_MODE_MON;
1510 cortex_a8_dpm_setup(cortex_a8, didr);
1511
1512 /* Setup Breakpoint Register Pairs */
1513 cortex_a8->brp_num = ((didr >> 24) & 0x0F) + 1;
1514 cortex_a8->brp_num_context = ((didr >> 20) & 0x0F) + 1;
1515 cortex_a8->brp_num_available = cortex_a8->brp_num;
1516 cortex_a8->brp_list = calloc(cortex_a8->brp_num, sizeof(struct cortex_a8_brp));
1517 // cortex_a8->brb_enabled = ????;
1518 for (i = 0; i < cortex_a8->brp_num; i++)
1519 {
1520 cortex_a8->brp_list[i].used = 0;
1521 if (i < (cortex_a8->brp_num-cortex_a8->brp_num_context))
1522 cortex_a8->brp_list[i].type = BRP_NORMAL;
1523 else
1524 cortex_a8->brp_list[i].type = BRP_CONTEXT;
1525 cortex_a8->brp_list[i].value = 0;
1526 cortex_a8->brp_list[i].control = 0;
1527 cortex_a8->brp_list[i].BRPn = i;
1528 }
1529
1530 /* Setup Watchpoint Register Pairs */
1531 cortex_a8->wrp_num = ((didr >> 28) & 0x0F) + 1;
1532 cortex_a8->wrp_num_available = cortex_a8->wrp_num;
1533 cortex_a8->wrp_list = calloc(cortex_a8->wrp_num, sizeof(struct cortex_a8_wrp));
1534 for (i = 0; i < cortex_a8->wrp_num; i++)
1535 {
1536 cortex_a8->wrp_list[i].used = 0;
1537 cortex_a8->wrp_list[i].type = 0;
1538 cortex_a8->wrp_list[i].value = 0;
1539 cortex_a8->wrp_list[i].control = 0;
1540 cortex_a8->wrp_list[i].WRPn = i;
1541 }
1542 LOG_DEBUG("Configured %i hw breakpoint pairs and %i hw watchpoint pairs",
1543 cortex_a8->brp_num , cortex_a8->wrp_num);
1544
1545 target_set_examined(target);
1546 return ERROR_OK;
1547 }
1548
1549 static int cortex_a8_examine(struct target *target)
1550 {
1551 int retval = ERROR_OK;
1552
1553 /* don't re-probe hardware after each reset */
1554 if (!target_was_examined(target))
1555 retval = cortex_a8_examine_first(target);
1556
1557 /* Configure core debug access */
1558 if (retval == ERROR_OK)
1559 retval = cortex_a8_init_debug_access(target);
1560
1561 return retval;
1562 }
1563
1564 /*
1565 * Cortex-A8 target creation and initialization
1566 */
1567
1568 static int cortex_a8_init_target(struct command_context *cmd_ctx,
1569 struct target *target)
1570 {
1571 /* examine_first() does a bunch of this */
1572 return ERROR_OK;
1573 }
1574
1575 static int cortex_a8_init_arch_info(struct target *target,
1576 struct cortex_a8_common *cortex_a8, struct jtag_tap *tap)
1577 {
1578 struct armv7a_common *armv7a = &cortex_a8->armv7a_common;
1579 struct arm *armv4_5 = &armv7a->armv4_5_common;
1580 struct swjdp_common *swjdp = &armv7a->swjdp_info;
1581
1582 /* Setup struct cortex_a8_common */
1583 cortex_a8->common_magic = CORTEX_A8_COMMON_MAGIC;
1584 armv4_5->arch_info = armv7a;
1585
1586 /* prepare JTAG information for the new target */
1587 cortex_a8->jtag_info.tap = tap;
1588 cortex_a8->jtag_info.scann_size = 4;
1589
1590 swjdp->dp_select_value = -1;
1591 swjdp->ap_csw_value = -1;
1592 swjdp->ap_tar_value = -1;
1593 swjdp->jtag_info = &cortex_a8->jtag_info;
1594 swjdp->memaccess_tck = 80;
1595
1596 /* Number of bits for tar autoincrement, impl. dep. at least 10 */
1597 swjdp->tar_autoincr_block = (1 << 10);
1598
1599 cortex_a8->fast_reg_read = 0;
1600
1601 /* register arch-specific functions */
1602 armv7a->examine_debug_reason = NULL;
1603
1604 armv7a->post_debug_entry = cortex_a8_post_debug_entry;
1605
1606 armv7a->pre_restore_context = NULL;
1607 armv7a->post_restore_context = NULL;
1608 armv7a->armv4_5_mmu.armv4_5_cache.ctype = -1;
1609 // armv7a->armv4_5_mmu.get_ttb = armv7a_get_ttb;
1610 armv7a->armv4_5_mmu.read_memory = cortex_a8_read_memory;
1611 armv7a->armv4_5_mmu.write_memory = cortex_a8_write_memory;
1612 // armv7a->armv4_5_mmu.disable_mmu_caches = armv7a_disable_mmu_caches;
1613 // armv7a->armv4_5_mmu.enable_mmu_caches = armv7a_enable_mmu_caches;
1614 armv7a->armv4_5_mmu.has_tiny_pages = 1;
1615 armv7a->armv4_5_mmu.mmu_enabled = 0;
1616
1617
1618 // arm7_9->handle_target_request = cortex_a8_handle_target_request;
1619
1620 /* REVISIT v7a setup should be in a v7a-specific routine */
1621 armv4_5_init_arch_info(target, armv4_5);
1622 armv7a->common_magic = ARMV7_COMMON_MAGIC;
1623
1624 target_register_timer_callback(cortex_a8_handle_target_request, 1, 1, target);
1625
1626 return ERROR_OK;
1627 }
1628
1629 static int cortex_a8_target_create(struct target *target, Jim_Interp *interp)
1630 {
1631 struct cortex_a8_common *cortex_a8 = calloc(1, sizeof(struct cortex_a8_common));
1632
1633 cortex_a8_init_arch_info(target, cortex_a8, target->tap);
1634
1635 return ERROR_OK;
1636 }
1637
1638 COMMAND_HANDLER(cortex_a8_handle_cache_info_command)
1639 {
1640 struct target *target = get_current_target(CMD_CTX);
1641 struct armv7a_common *armv7a = target_to_armv7a(target);
1642
1643 return armv4_5_handle_cache_info_command(CMD_CTX,
1644 &armv7a->armv4_5_mmu.armv4_5_cache);
1645 }
1646
1647
1648 COMMAND_HANDLER(cortex_a8_handle_dbginit_command)
1649 {
1650 struct target *target = get_current_target(CMD_CTX);
1651
1652 cortex_a8_init_debug_access(target);
1653
1654 return ERROR_OK;
1655 }
1656
1657 static const struct command_registration cortex_a8_exec_command_handlers[] = {
1658 {
1659 .name = "cache_info",
1660 .handler = &cortex_a8_handle_cache_info_command,
1661 .mode = COMMAND_EXEC,
1662 .help = "display information about target caches",
1663 },
1664 {
1665 .name = "dbginit",
1666 .handler = &cortex_a8_handle_dbginit_command,
1667 .mode = COMMAND_EXEC,
1668 .help = "Initialize core debug",
1669 },
1670 COMMAND_REGISTRATION_DONE
1671 };
1672 static const struct command_registration cortex_a8_command_handlers[] = {
1673 {
1674 .chain = arm_command_handlers,
1675 },
1676 {
1677 .chain = armv7a_command_handlers,
1678 },
1679 {
1680 .name = "cortex_a8",
1681 .mode = COMMAND_ANY,
1682 .help = "Cortex-A8 command group",
1683 .chain = cortex_a8_exec_command_handlers,
1684 },
1685 COMMAND_REGISTRATION_DONE
1686 };
1687
1688 struct target_type cortexa8_target = {
1689 .name = "cortex_a8",
1690
1691 .poll = cortex_a8_poll,
1692 .arch_state = armv7a_arch_state,
1693
1694 .target_request_data = NULL,
1695
1696 .halt = cortex_a8_halt,
1697 .resume = cortex_a8_resume,
1698 .step = cortex_a8_step,
1699
1700 .assert_reset = cortex_a8_assert_reset,
1701 .deassert_reset = cortex_a8_deassert_reset,
1702 .soft_reset_halt = NULL,
1703
1704 .get_gdb_reg_list = armv4_5_get_gdb_reg_list,
1705
1706 .read_memory = cortex_a8_read_memory,
1707 .write_memory = cortex_a8_write_memory,
1708 .bulk_write_memory = cortex_a8_bulk_write_memory,
1709
1710 .checksum_memory = arm_checksum_memory,
1711 .blank_check_memory = arm_blank_check_memory,
1712
1713 .run_algorithm = armv4_5_run_algorithm,
1714
1715 .add_breakpoint = cortex_a8_add_breakpoint,
1716 .remove_breakpoint = cortex_a8_remove_breakpoint,
1717 .add_watchpoint = NULL,
1718 .remove_watchpoint = NULL,
1719
1720 .commands = cortex_a8_command_handlers,
1721 .target_create = cortex_a8_target_create,
1722 .init_target = cortex_a8_init_target,
1723 .examine = cortex_a8_examine,
1724 };
Some of Dave's pending patches