[RFC] target: Move bulk_write_memory to arm7_9
[openocd.git] / src / target / arm7tdmi.c
1 /***************************************************************************
2 * Copyright (C) 2005 by Dominic Rath *
3 * Dominic.Rath@gmx.de *
4 * *
5 * Copyright (C) 2008 by Spencer Oliver *
6 * spen@spen-soft.co.uk *
7 * *
8 * Copyright (C) 2007,2008 √ėyvind Harboe *
9 * oyvind.harboe@zylin.com *
10 * *
11 * This program is free software; you can redistribute it and/or modify *
12 * it under the terms of the GNU General Public License as published by *
13 * the Free Software Foundation; either version 2 of the License, or *
14 * (at your option) any later version. *
15 * *
16 * This program is distributed in the hope that it will be useful, *
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
19 * GNU General Public License for more details. *
20 * *
21 * You should have received a copy of the GNU General Public License *
22 * along with this program; if not, write to the *
23 * Free Software Foundation, Inc., *
24 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. *
25 ***************************************************************************/
26
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #include "arm7tdmi.h"
32 #include "target_type.h"
33 #include "register.h"
34 #include "arm_opcodes.h"
35
36 /*
37 * For information about ARM7TDMI, see ARM DDI 0210C (r4p1)
38 * or ARM DDI 0029G (r3). "Debug In Depth", Appendix B,
39 * covers JTAG support.
40 */
41
42 #if 0
43 #define _DEBUG_INSTRUCTION_EXECUTION_
44 #endif
45
46 static int arm7tdmi_examine_debug_reason(struct target *target)
47 {
48 int retval = ERROR_OK;
49 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
50
51 /* only check the debug reason if we don't know it already */
52 if ((target->debug_reason != DBG_REASON_DBGRQ)
53 && (target->debug_reason != DBG_REASON_SINGLESTEP)) {
54 struct scan_field fields[2];
55 uint8_t databus[4];
56 uint8_t breakpoint;
57
58 fields[0].num_bits = 1;
59 fields[0].out_value = NULL;
60 fields[0].in_value = &breakpoint;
61
62 fields[1].num_bits = 32;
63 fields[1].out_value = NULL;
64 fields[1].in_value = databus;
65
66 retval = arm_jtag_scann(&arm7_9->jtag_info, 0x1, TAP_DRPAUSE);
67 if (retval != ERROR_OK)
68 return retval;
69 retval = arm_jtag_set_instr(&arm7_9->jtag_info, arm7_9->jtag_info.intest_instr, NULL, TAP_DRPAUSE);
70 if (retval != ERROR_OK)
71 return retval;
72
73 jtag_add_dr_scan(arm7_9->jtag_info.tap, 2, fields, TAP_DRPAUSE);
74 retval = jtag_execute_queue();
75 if (retval != ERROR_OK)
76 return retval;
77
78 fields[0].in_value = NULL;
79 fields[0].out_value = &breakpoint;
80 fields[1].in_value = NULL;
81 fields[1].out_value = databus;
82
83 jtag_add_dr_scan(arm7_9->jtag_info.tap, 2, fields, TAP_DRPAUSE);
84
85 if (breakpoint & 1)
86 target->debug_reason = DBG_REASON_WATCHPOINT;
87 else
88 target->debug_reason = DBG_REASON_BREAKPOINT;
89 }
90
91 return ERROR_OK;
92 }
93
94 static const int arm7tdmi_num_bits[] = {1, 32};
95
96 static inline int arm7tdmi_clock_out_inner(struct arm_jtag *jtag_info, uint32_t out, int breakpoint)
97 {
98 uint32_t values[2] = {breakpoint, flip_u32(out, 32)};
99
100 jtag_add_dr_out(jtag_info->tap,
101 2,
102 arm7tdmi_num_bits,
103 values,
104 TAP_DRPAUSE);
105
106 jtag_add_runtest(0, TAP_DRPAUSE);
107
108 return ERROR_OK;
109 }
110
111 /* put an instruction in the ARM7TDMI pipeline or write the data bus,
112 * and optionally read data
113 *
114 * FIXME remove the unused "deprecated" parameter
115 */
116 static inline int arm7tdmi_clock_out(struct arm_jtag *jtag_info,
117 uint32_t out, uint32_t *deprecated, int breakpoint)
118 {
119 int retval;
120 retval = arm_jtag_scann(jtag_info, 0x1, TAP_DRPAUSE);
121 if (retval != ERROR_OK)
122 return retval;
123 retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_DRPAUSE);
124 if (retval != ERROR_OK)
125 return retval;
126
127 return arm7tdmi_clock_out_inner(jtag_info, out, breakpoint);
128 }
129
130 /* clock the target, reading the databus */
131 static int arm7tdmi_clock_data_in(struct arm_jtag *jtag_info, uint32_t *in)
132 {
133 int retval = ERROR_OK;
134 struct scan_field fields[2];
135
136 retval = arm_jtag_scann(jtag_info, 0x1, TAP_DRPAUSE);
137 if (retval != ERROR_OK)
138 return retval;
139 retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_DRPAUSE);
140 if (retval != ERROR_OK)
141 return retval;
142
143 fields[0].num_bits = 1;
144 fields[0].out_value = NULL;
145 fields[0].in_value = NULL;
146
147 fields[1].num_bits = 32;
148 fields[1].out_value = NULL;
149 fields[1].in_value = (uint8_t *)in;
150
151 jtag_add_dr_scan(jtag_info->tap, 2, fields, TAP_DRPAUSE);
152
153 jtag_add_callback(arm7flip32, (jtag_callback_data_t)in);
154
155 jtag_add_runtest(0, TAP_DRPAUSE);
156
157 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
158 retval = jtag_execute_queue();
159 if (retval != ERROR_OK)
160 return retval;
161
162 if (in)
163 LOG_DEBUG("in: 0x%8.8x", *in);
164 else
165 LOG_ERROR("BUG: called with in == NULL");
166 #endif
167
168 return ERROR_OK;
169 }
170
171 /* clock the target, and read the databus
172 * the *in pointer points to a buffer where elements of 'size' bytes
173 * are stored in big (be == 1) or little (be == 0) endianness
174 */
175 static int arm7tdmi_clock_data_in_endianness(struct arm_jtag *jtag_info,
176 void *in, int size, int be)
177 {
178 int retval = ERROR_OK;
179 struct scan_field fields[3];
180
181 retval = arm_jtag_scann(jtag_info, 0x1, TAP_DRPAUSE);
182 if (retval != ERROR_OK)
183 return retval;
184 retval = arm_jtag_set_instr(jtag_info, jtag_info->intest_instr, NULL, TAP_DRPAUSE);
185 if (retval != ERROR_OK)
186 return retval;
187
188 fields[0].num_bits = 1;
189 fields[0].out_value = NULL;
190 fields[0].in_value = NULL;
191
192 if (size == 4) {
193 fields[1].num_bits = 32;
194 fields[1].out_value = NULL;
195 fields[1].in_value = in;
196 } else {
197 /* Discard irrelevant bits of the scan, making sure we don't write more
198 * than size bytes to in */
199 fields[1].num_bits = 32 - size * 8;
200 fields[1].out_value = NULL;
201 fields[1].in_value = NULL;
202
203 fields[2].num_bits = size * 8;
204 fields[2].out_value = NULL;
205 fields[2].in_value = in;
206 }
207
208 jtag_add_dr_scan(jtag_info->tap, size == 4 ? 2 : 3, fields, TAP_DRPAUSE);
209
210 jtag_add_callback4(arm7_9_endianness_callback,
211 (jtag_callback_data_t)in,
212 (jtag_callback_data_t)size,
213 (jtag_callback_data_t)be,
214 (jtag_callback_data_t)1);
215
216 jtag_add_runtest(0, TAP_DRPAUSE);
217
218 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
219 {
220 retval = jtag_execute_queue();
221 if (retval != ERROR_OK)
222 return retval;
223
224 if (in)
225 LOG_DEBUG("in: 0x%8.8x", *(uint32_t *)in);
226 else
227 LOG_ERROR("BUG: called with in == NULL");
228 }
229 #endif
230
231 return ERROR_OK;
232 }
233
234 static void arm7tdmi_change_to_arm(struct target *target,
235 uint32_t *r0, uint32_t *pc)
236 {
237 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
238 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
239
240 /* save r0 before using it and put system in ARM state
241 * to allow common handling of ARM and THUMB debugging */
242
243 /* fetch STR r0, [r0] */
244 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
245 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
246 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
247 /* nothing fetched, STR r0, [r0] in Execute (2) */
248 arm7tdmi_clock_data_in(jtag_info, r0);
249
250 /* MOV r0, r15 fetched, STR in Decode */
251 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_MOV(0, 15), NULL, 0);
252 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
253 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
254 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
255 /* nothing fetched, STR r0, [r0] in Execute (2) */
256 arm7tdmi_clock_data_in(jtag_info, pc);
257
258 /* use pc-relative LDR to clear r0[1:0] (for switch to ARM mode) */
259 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
260 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
261 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
262 /* nothing fetched, data for LDR r0, [PC, #0] */
263 arm7tdmi_clock_out(jtag_info, 0x0, NULL, 0);
264 /* nothing fetched, data from previous cycle is written to register */
265 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
266
267 /* fetch BX */
268 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_BX(0), NULL, 0);
269 /* NOP fetched, BX in Decode, MOV in Execute */
270 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
271 /* NOP fetched, BX in Execute (1) */
272 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
273
274 jtag_execute_queue();
275
276 /* fix program counter:
277 * MOV r0, r15 was the 4th instruction (+6)
278 * reading PC in Thumb state gives address of instruction + 4
279 */
280 *pc -= 0xa;
281 }
282
283 /* FIX!!! is this a potential performance bottleneck w.r.t. requiring too many
284 * roundtrips when jtag_execute_queue() has a large overhead(e.g. for USB)s?
285 *
286 * The solution is to arrange for a large out/in scan in this loop and
287 * and convert data afterwards.
288 */
289 static void arm7tdmi_read_core_regs(struct target *target,
290 uint32_t mask, uint32_t *core_regs[16])
291 {
292 int i;
293 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
294 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
295
296 /* STMIA r0-15, [r0] at debug speed
297 * register values will start to appear on 4th DCLK
298 */
299 arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
300
301 /* fetch NOP, STM in DECODE stage */
302 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
303 /* fetch NOP, STM in EXECUTE stage (1st cycle) */
304 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
305
306 for (i = 0; i <= 15; i++) {
307 if (mask & (1 << i))
308 /* nothing fetched, STM still in EXECUTE (1 + i cycle) */
309 arm7tdmi_clock_data_in(jtag_info, core_regs[i]);
310 }
311 }
312
313 static void arm7tdmi_read_core_regs_target_buffer(struct target *target,
314 uint32_t mask, void *buffer, int size)
315 {
316 int i;
317 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
318 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
319 int be = (target->endianness == TARGET_BIG_ENDIAN) ? 1 : 0;
320 uint32_t *buf_u32 = buffer;
321 uint16_t *buf_u16 = buffer;
322 uint8_t *buf_u8 = buffer;
323
324 /* STMIA r0-15, [r0] at debug speed
325 * register values will start to appear on 4th DCLK
326 */
327 arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
328
329 /* fetch NOP, STM in DECODE stage */
330 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
331 /* fetch NOP, STM in EXECUTE stage (1st cycle) */
332 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
333
334 for (i = 0; i <= 15; i++) {
335 /* nothing fetched, STM still in EXECUTE (1 + i cycle), read databus */
336 if (mask & (1 << i)) {
337 switch (size) {
338 case 4:
339 arm7tdmi_clock_data_in_endianness(jtag_info, buf_u32++, 4, be);
340 break;
341 case 2:
342 arm7tdmi_clock_data_in_endianness(jtag_info, buf_u16++, 2, be);
343 break;
344 case 1:
345 arm7tdmi_clock_data_in_endianness(jtag_info, buf_u8++, 1, be);
346 break;
347 }
348 }
349 }
350 }
351
352 static void arm7tdmi_read_xpsr(struct target *target, uint32_t *xpsr, int spsr)
353 {
354 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
355 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
356
357 /* MRS r0, cpsr */
358 arm7tdmi_clock_out(jtag_info, ARMV4_5_MRS(0, spsr & 1), NULL, 0);
359
360 /* STR r0, [r15] */
361 arm7tdmi_clock_out(jtag_info, ARMV4_5_STR(0, 15), NULL, 0);
362 /* fetch NOP, STR in DECODE stage */
363 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
364 /* fetch NOP, STR in EXECUTE stage (1st cycle) */
365 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
366 /* nothing fetched, STR still in EXECUTE (2nd cycle) */
367 arm7tdmi_clock_data_in(jtag_info, xpsr);
368 }
369
370 static void arm7tdmi_write_xpsr(struct target *target, uint32_t xpsr, int spsr)
371 {
372 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
373 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
374
375 LOG_DEBUG("xpsr: %8.8" PRIx32 ", spsr: %i", xpsr, spsr);
376
377 /* MSR1 fetched */
378 arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr & 0xff, 0, 1, spsr), NULL, 0);
379 /* MSR2 fetched, MSR1 in DECODE */
380 arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff00) >> 8, 0xc, 2, spsr), NULL, 0);
381 /* MSR3 fetched, MSR1 in EXECUTE (1), MSR2 in DECODE */
382 arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff0000) >> 16, 0x8, 4, spsr), NULL, 0);
383 /* nothing fetched, MSR1 in EXECUTE (2) */
384 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
385 /* MSR4 fetched, MSR2 in EXECUTE (1), MSR3 in DECODE */
386 arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff000000) >> 24, 0x4, 8, spsr), NULL, 0);
387 /* nothing fetched, MSR2 in EXECUTE (2) */
388 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
389 /* NOP fetched, MSR3 in EXECUTE (1), MSR4 in DECODE */
390 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
391 /* nothing fetched, MSR3 in EXECUTE (2) */
392 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
393 /* NOP fetched, MSR4 in EXECUTE (1) */
394 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
395 /* nothing fetched, MSR4 in EXECUTE (2) */
396 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
397 }
398
399 static void arm7tdmi_write_xpsr_im8(struct target *target,
400 uint8_t xpsr_im, int rot, int spsr)
401 {
402 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
403 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
404
405 LOG_DEBUG("xpsr_im: %2.2x, rot: %i, spsr: %i", xpsr_im, rot, spsr);
406
407 /* MSR fetched */
408 arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr_im, rot, 1, spsr), NULL, 0);
409 /* NOP fetched, MSR in DECODE */
410 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
411 /* NOP fetched, MSR in EXECUTE (1) */
412 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
413 /* nothing fetched, MSR in EXECUTE (2) */
414 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
415 }
416
417 static void arm7tdmi_write_core_regs(struct target *target,
418 uint32_t mask, uint32_t core_regs[16])
419 {
420 int i;
421 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
422 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
423
424 /* LDMIA r0-15, [r0] at debug speed
425 * register values will start to appear on 4th DCLK
426 */
427 arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 0), NULL, 0);
428
429 /* fetch NOP, LDM in DECODE stage */
430 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
431 /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
432 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
433
434 for (i = 0; i <= 15; i++) {
435 if (mask & (1 << i))
436 /* nothing fetched, LDM still in EXECUTE (1 + i cycle) */
437 arm7tdmi_clock_out_inner(jtag_info, core_regs[i], 0);
438 }
439 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
440 }
441
442 static void arm7tdmi_load_word_regs(struct target *target, uint32_t mask)
443 {
444 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
445 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
446
447 /* put system-speed load-multiple into the pipeline */
448 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
449 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
450 arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 1), NULL, 0);
451 }
452
453 static void arm7tdmi_load_hword_reg(struct target *target, int num)
454 {
455 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
456 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
457
458 /* put system-speed load half-word into the pipeline */
459 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
460 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
461 arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRH_IP(num, 0), NULL, 0);
462 }
463
464 static void arm7tdmi_load_byte_reg(struct target *target, int num)
465 {
466 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
467 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
468
469 /* put system-speed load byte into the pipeline */
470 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
471 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
472 arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRB_IP(num, 0), NULL, 0);
473 }
474
475 static void arm7tdmi_store_word_regs(struct target *target, uint32_t mask)
476 {
477 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
478 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
479
480 /* put system-speed store-multiple into the pipeline */
481 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
482 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
483 arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask, 0, 1), NULL, 0);
484 }
485
486 static void arm7tdmi_store_hword_reg(struct target *target, int num)
487 {
488 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
489 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
490
491 /* put system-speed store half-word into the pipeline */
492 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
493 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
494 arm7tdmi_clock_out(jtag_info, ARMV4_5_STRH_IP(num, 0), NULL, 0);
495 }
496
497 static void arm7tdmi_store_byte_reg(struct target *target, int num)
498 {
499 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
500 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
501
502 /* put system-speed store byte into the pipeline */
503 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
504 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
505 arm7tdmi_clock_out(jtag_info, ARMV4_5_STRB_IP(num, 0), NULL, 0);
506 }
507
508 static void arm7tdmi_write_pc(struct target *target, uint32_t pc)
509 {
510 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
511 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
512
513 /* LDMIA r0-15, [r0] at debug speed
514 * register values will start to appear on 4th DCLK
515 */
516 arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x8000, 0, 0), NULL, 0);
517 /* fetch NOP, LDM in DECODE stage */
518 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
519 /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
520 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
521 /* nothing fetched, LDM in EXECUTE stage (1st cycle) load register */
522 arm7tdmi_clock_out_inner(jtag_info, pc, 0);
523 /* nothing fetched, LDM in EXECUTE stage (2nd cycle) load register */
524 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
525 /* nothing fetched, LDM in EXECUTE stage (3rd cycle) load register */
526 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
527 /* fetch NOP, LDM in EXECUTE stage (4th cycle) */
528 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
529 /* fetch NOP, LDM in EXECUTE stage (5th cycle) */
530 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
531 }
532
533 static void arm7tdmi_branch_resume(struct target *target)
534 {
535 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
536 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
537
538 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
539 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_B(0xfffffa, 0), 0);
540 }
541
542 static void arm7tdmi_branch_resume_thumb(struct target *target)
543 {
544 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
545 struct arm *arm = &arm7_9->arm;
546 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
547 struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
548
549 LOG_DEBUG("-");
550
551 /* LDMIA r0, [r0] at debug speed
552 * register values will start to appear on 4th DCLK
553 */
554 arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x1, 0, 0), NULL, 0);
555
556 /* fetch NOP, LDM in DECODE stage */
557 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
558 /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
559 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
560 /* nothing fetched, LDM in EXECUTE stage (2nd cycle) */
561 arm7tdmi_clock_out(jtag_info,
562 buf_get_u32(arm->pc->value, 0, 32) | 1, NULL, 0);
563 /* nothing fetched, LDM in EXECUTE stage (3rd cycle) */
564 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
565
566 /* Branch and eXchange */
567 arm7tdmi_clock_out(jtag_info, ARMV4_5_BX(0), NULL, 0);
568
569 embeddedice_read_reg(dbg_stat);
570
571 /* fetch NOP, BX in DECODE stage */
572 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
573
574 /* target is now in Thumb state */
575 embeddedice_read_reg(dbg_stat);
576
577 /* fetch NOP, BX in EXECUTE stage (1st cycle) */
578 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
579
580 /* target is now in Thumb state */
581 embeddedice_read_reg(dbg_stat);
582
583 /* load r0 value */
584 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
585 /* fetch NOP, LDR in Decode */
586 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
587 /* fetch NOP, LDR in Execute */
588 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
589 /* nothing fetched, LDR in EXECUTE stage (2nd cycle) */
590 arm7tdmi_clock_out(jtag_info, buf_get_u32(arm->core_cache->reg_list[0].value, 0, 32), NULL, 0);
591 /* nothing fetched, LDR in EXECUTE stage (3rd cycle) */
592 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
593
594 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
595 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
596
597 embeddedice_read_reg(dbg_stat);
598
599 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 1);
600 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_B(0x7f8), NULL, 0);
601 }
602
603 static void arm7tdmi_build_reg_cache(struct target *target)
604 {
605 struct reg_cache **cache_p = register_get_last_cache_p(&target->reg_cache);
606 struct arm *arm = target_to_arm(target);
607
608 (*cache_p) = arm_build_reg_cache(target, arm);
609 }
610
611 int arm7tdmi_init_target(struct command_context *cmd_ctx, struct target *target)
612 {
613 arm7tdmi_build_reg_cache(target);
614
615 return ERROR_OK;
616 }
617
618 int arm7tdmi_init_arch_info(struct target *target,
619 struct arm7_9_common *arm7_9, struct jtag_tap *tap)
620 {
621 /* prepare JTAG information for the new target */
622 arm7_9->jtag_info.tap = tap;
623 arm7_9->jtag_info.scann_size = 4;
624
625 /* register arch-specific functions */
626 arm7_9->examine_debug_reason = arm7tdmi_examine_debug_reason;
627 arm7_9->change_to_arm = arm7tdmi_change_to_arm;
628 arm7_9->read_core_regs = arm7tdmi_read_core_regs;
629 arm7_9->read_core_regs_target_buffer = arm7tdmi_read_core_regs_target_buffer;
630 arm7_9->read_xpsr = arm7tdmi_read_xpsr;
631
632 arm7_9->write_xpsr = arm7tdmi_write_xpsr;
633 arm7_9->write_xpsr_im8 = arm7tdmi_write_xpsr_im8;
634 arm7_9->write_core_regs = arm7tdmi_write_core_regs;
635
636 arm7_9->load_word_regs = arm7tdmi_load_word_regs;
637 arm7_9->load_hword_reg = arm7tdmi_load_hword_reg;
638 arm7_9->load_byte_reg = arm7tdmi_load_byte_reg;
639
640 arm7_9->store_word_regs = arm7tdmi_store_word_regs;
641 arm7_9->store_hword_reg = arm7tdmi_store_hword_reg;
642 arm7_9->store_byte_reg = arm7tdmi_store_byte_reg;
643
644 arm7_9->write_pc = arm7tdmi_write_pc;
645 arm7_9->branch_resume = arm7tdmi_branch_resume;
646 arm7_9->branch_resume_thumb = arm7tdmi_branch_resume_thumb;
647
648 arm7_9->enable_single_step = arm7_9_enable_eice_step;
649 arm7_9->disable_single_step = arm7_9_disable_eice_step;
650
651 arm7_9->bulk_write_memory = arm7_9_bulk_write_memory;
652
653 arm7_9->post_debug_entry = NULL;
654
655 arm7_9->pre_restore_context = NULL;
656
657 /* initialize arch-specific breakpoint handling */
658 arm7_9->arm_bkpt = 0xdeeedeee;
659 arm7_9->thumb_bkpt = 0xdeee;
660
661 arm7_9->dbgreq_adjust_pc = 2;
662
663 arm7_9_init_arch_info(target, arm7_9);
664
665 return ERROR_OK;
666 }
667
668 static int arm7tdmi_target_create(struct target *target, Jim_Interp *interp)
669 {
670 struct arm7_9_common *arm7_9;
671
672 arm7_9 = calloc(1, sizeof(struct arm7_9_common));
673 arm7tdmi_init_arch_info(target, arm7_9, target->tap);
674 arm7_9->arm.is_armv4 = true;
675
676 return ERROR_OK;
677 }
678
679 /** Holds methods for ARM7TDMI targets. */
680 struct target_type arm7tdmi_target = {
681 .name = "arm7tdmi",
682
683 .poll = arm7_9_poll,
684 .arch_state = arm_arch_state,
685
686 .target_request_data = arm7_9_target_request_data,
687
688 .halt = arm7_9_halt,
689 .resume = arm7_9_resume,
690 .step = arm7_9_step,
691
692 .assert_reset = arm7_9_assert_reset,
693 .deassert_reset = arm7_9_deassert_reset,
694 .soft_reset_halt = arm7_9_soft_reset_halt,
695
696 .get_gdb_reg_list = arm_get_gdb_reg_list,
697
698 .read_memory = arm7_9_read_memory,
699 .write_memory = arm7_9_write_memory_opt,
700
701 .checksum_memory = arm_checksum_memory,
702 .blank_check_memory = arm_blank_check_memory,
703
704 .run_algorithm = armv4_5_run_algorithm,
705
706 .add_breakpoint = arm7_9_add_breakpoint,
707 .remove_breakpoint = arm7_9_remove_breakpoint,
708 .add_watchpoint = arm7_9_add_watchpoint,
709 .remove_watchpoint = arm7_9_remove_watchpoint,
710
711 .commands = arm7_9_command_handlers,
712 .target_create = arm7tdmi_target_create,
713 .init_target = arm7tdmi_init_target,
714 .examine = arm7_9_examine,
715 .check_reset = arm7_9_check_reset,
716 };