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target: generic ARM CTI function wrapper
[openocd.git] / src / target / arm7tdmi.c
blob9dcb302d9c88d2b12e9cd6d4e9e410bd422b44f1
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 Øyvind 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, see <http://www.gnu.org/licenses/>. *
23 ***************************************************************************/
24
25 #ifdef HAVE_CONFIG_H
26 #include "config.h"
27 #endif
28
29 #include "arm7tdmi.h"
30 #include "target_type.h"
31 #include "register.h"
32 #include "arm_opcodes.h"
33 #include "arm_semihosting.h"
34
35 /*
36 * For information about ARM7TDMI, see ARM DDI 0210C (r4p1)
37 * or ARM DDI 0029G (r3). "Debug In Depth", Appendix B,
38 * covers JTAG support.
39 */
40
41 #if 0
42 #define _DEBUG_INSTRUCTION_EXECUTION_
43 #endif
44
45 static int arm7tdmi_examine_debug_reason(struct target *target)
46 {
47 int retval = ERROR_OK;
48 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
49
50 /* only check the debug reason if we don't know it already */
51 if ((target->debug_reason != DBG_REASON_DBGRQ)
52 && (target->debug_reason != DBG_REASON_SINGLESTEP)) {
53 struct scan_field fields[2];
54 uint8_t databus[4];
55 uint8_t breakpoint;
56
57 fields[0].num_bits = 1;
58 fields[0].out_value = NULL;
59 fields[0].in_value = &breakpoint;
60
61 fields[1].num_bits = 32;
62 fields[1].out_value = NULL;
63 fields[1].in_value = databus;
64
65 retval = arm_jtag_scann(&arm7_9->jtag_info, 0x1, TAP_DRPAUSE);
66 if (retval != ERROR_OK)
67 return retval;
68 retval = arm_jtag_set_instr(arm7_9->jtag_info.tap, arm7_9->jtag_info.intest_instr, NULL, TAP_DRPAUSE);
69 if (retval != ERROR_OK)
70 return retval;
71
72 jtag_add_dr_scan(arm7_9->jtag_info.tap, 2, fields, TAP_DRPAUSE);
73 retval = jtag_execute_queue();
74 if (retval != ERROR_OK)
75 return retval;
76
77 fields[0].in_value = NULL;
78 fields[0].out_value = &breakpoint;
79 fields[1].in_value = NULL;
80 fields[1].out_value = databus;
81
82 jtag_add_dr_scan(arm7_9->jtag_info.tap, 2, fields, TAP_DRPAUSE);
83
84 if (breakpoint & 1)
85 target->debug_reason = DBG_REASON_WATCHPOINT;
86 else
87 target->debug_reason = DBG_REASON_BREAKPOINT;
88 }
89
90 return ERROR_OK;
91 }
92
93 static const int arm7tdmi_num_bits[] = {1, 32};
94
95 static inline int arm7tdmi_clock_out_inner(struct arm_jtag *jtag_info, uint32_t out, int breakpoint)
96 {
97 uint8_t bp = breakpoint ? 1 : 0;
98 uint8_t out_value[4];
99 buf_set_u32(out_value, 0, 32, flip_u32(out, 32));
100
101 struct scan_field fields[2] = {
102 { .num_bits = arm7tdmi_num_bits[0], .out_value = &bp },
103 { .num_bits = arm7tdmi_num_bits[1], .out_value = out_value },
104 };
105
106 jtag_add_dr_scan(jtag_info->tap,
107 2,
108 fields,
109 TAP_DRPAUSE);
110
111 jtag_add_runtest(0, TAP_DRPAUSE);
112
113 return ERROR_OK;
114 }
115
116 /* put an instruction in the ARM7TDMI pipeline or write the data bus,
117 * and optionally read data
118 *
119 * FIXME remove the unused "deprecated" parameter
120 */
121 static inline int arm7tdmi_clock_out(struct arm_jtag *jtag_info,
122 uint32_t out, uint32_t *deprecated, int breakpoint)
123 {
124 int retval;
125 retval = arm_jtag_scann(jtag_info, 0x1, TAP_DRPAUSE);
126 if (retval != ERROR_OK)
127 return retval;
128 retval = arm_jtag_set_instr(jtag_info->tap, jtag_info->intest_instr, NULL, TAP_DRPAUSE);
129 if (retval != ERROR_OK)
130 return retval;
131
132 return arm7tdmi_clock_out_inner(jtag_info, out, breakpoint);
133 }
134
135 /* clock the target, reading the databus */
136 static int arm7tdmi_clock_data_in(struct arm_jtag *jtag_info, uint32_t *in)
137 {
138 int retval = ERROR_OK;
139 struct scan_field fields[2];
140
141 retval = arm_jtag_scann(jtag_info, 0x1, TAP_DRPAUSE);
142 if (retval != ERROR_OK)
143 return retval;
144 retval = arm_jtag_set_instr(jtag_info->tap, jtag_info->intest_instr, NULL, TAP_DRPAUSE);
145 if (retval != ERROR_OK)
146 return retval;
147
148 fields[0].num_bits = 1;
149 fields[0].out_value = NULL;
150 fields[0].in_value = NULL;
151
152 fields[1].num_bits = 32;
153 fields[1].out_value = NULL;
154 fields[1].in_value = (uint8_t *)in;
155
156 jtag_add_dr_scan(jtag_info->tap, 2, fields, TAP_DRPAUSE);
157
158 jtag_add_callback(arm7flip32, (jtag_callback_data_t)in);
159
160 jtag_add_runtest(0, TAP_DRPAUSE);
161
162 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
163 retval = jtag_execute_queue();
164 if (retval != ERROR_OK)
165 return retval;
166
167 if (in)
168 LOG_DEBUG("in: 0x%8.8x", *in);
169 else
170 LOG_ERROR("BUG: called with in == NULL");
171 #endif
172
173 return ERROR_OK;
174 }
175
176 /* clock the target, and read the databus
177 * the *in pointer points to a buffer where elements of 'size' bytes
178 * are stored in big (be == 1) or little (be == 0) endianness
179 */
180 static int arm7tdmi_clock_data_in_endianness(struct arm_jtag *jtag_info,
181 void *in, int size, int be)
182 {
183 int retval = ERROR_OK;
184 struct scan_field fields[3];
185
186 retval = arm_jtag_scann(jtag_info, 0x1, TAP_DRPAUSE);
187 if (retval != ERROR_OK)
188 return retval;
189 retval = arm_jtag_set_instr(jtag_info->tap, jtag_info->intest_instr, NULL, TAP_DRPAUSE);
190 if (retval != ERROR_OK)
191 return retval;
192
193 fields[0].num_bits = 1;
194 fields[0].out_value = NULL;
195 fields[0].in_value = NULL;
196
197 if (size == 4) {
198 fields[1].num_bits = 32;
199 fields[1].out_value = NULL;
200 fields[1].in_value = in;
201 } else {
202 /* Discard irrelevant bits of the scan, making sure we don't write more
203 * than size bytes to in */
204 fields[1].num_bits = 32 - size * 8;
205 fields[1].out_value = NULL;
206 fields[1].in_value = NULL;
207
208 fields[2].num_bits = size * 8;
209 fields[2].out_value = NULL;
210 fields[2].in_value = in;
211 }
212
213 jtag_add_dr_scan(jtag_info->tap, size == 4 ? 2 : 3, fields, TAP_DRPAUSE);
214
215 jtag_add_callback4(arm7_9_endianness_callback,
216 (jtag_callback_data_t)in,
217 (jtag_callback_data_t)size,
218 (jtag_callback_data_t)be,
219 (jtag_callback_data_t)1);
220
221 jtag_add_runtest(0, TAP_DRPAUSE);
222
223 #ifdef _DEBUG_INSTRUCTION_EXECUTION_
224 {
225 retval = jtag_execute_queue();
226 if (retval != ERROR_OK)
227 return retval;
228
229 if (in)
230 LOG_DEBUG("in: 0x%8.8x", *(uint32_t *)in);
231 else
232 LOG_ERROR("BUG: called with in == NULL");
233 }
234 #endif
235
236 return ERROR_OK;
237 }
238
239 static void arm7tdmi_change_to_arm(struct target *target,
240 uint32_t *r0, uint32_t *pc)
241 {
242 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
243 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
244
245 /* save r0 before using it and put system in ARM state
246 * to allow common handling of ARM and THUMB debugging */
247
248 /* fetch STR r0, [r0] */
249 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
250 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
251 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
252 /* nothing fetched, STR r0, [r0] in Execute (2) */
253 arm7tdmi_clock_data_in(jtag_info, r0);
254
255 /* MOV r0, r15 fetched, STR in Decode */
256 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_MOV(0, 15), NULL, 0);
257 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_STR(0, 0), NULL, 0);
258 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
259 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
260 /* nothing fetched, STR r0, [r0] in Execute (2) */
261 arm7tdmi_clock_data_in(jtag_info, pc);
262
263 /* use pc-relative LDR to clear r0[1:0] (for switch to ARM mode) */
264 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
265 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
266 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
267 /* nothing fetched, data for LDR r0, [PC, #0] */
268 arm7tdmi_clock_out(jtag_info, 0x0, NULL, 0);
269 /* nothing fetched, data from previous cycle is written to register */
270 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
271
272 /* fetch BX */
273 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_BX(0), NULL, 0);
274 /* NOP fetched, BX in Decode, MOV in Execute */
275 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
276 /* NOP fetched, BX in Execute (1) */
277 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
278
279 jtag_execute_queue();
280
281 /* fix program counter:
282 * MOV r0, r15 was the 4th instruction (+6)
283 * reading PC in Thumb state gives address of instruction + 4
284 */
285 *pc -= 0xa;
286 }
287
288 /* FIX!!! is this a potential performance bottleneck w.r.t. requiring too many
289 * roundtrips when jtag_execute_queue() has a large overhead(e.g. for USB)s?
290 *
291 * The solution is to arrange for a large out/in scan in this loop and
292 * and convert data afterwards.
293 */
294 static void arm7tdmi_read_core_regs(struct target *target,
295 uint32_t mask, uint32_t *core_regs[16])
296 {
297 int i;
298 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
299 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
300
301 /* STMIA r0-15, [r0] at debug speed
302 * register values will start to appear on 4th DCLK
303 */
304 arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
305
306 /* fetch NOP, STM in DECODE stage */
307 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
308 /* fetch NOP, STM in EXECUTE stage (1st cycle) */
309 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
310
311 for (i = 0; i <= 15; i++) {
312 if (mask & (1 << i))
313 /* nothing fetched, STM still in EXECUTE (1 + i cycle) */
314 arm7tdmi_clock_data_in(jtag_info, core_regs[i]);
315 }
316 }
317
318 static void arm7tdmi_read_core_regs_target_buffer(struct target *target,
319 uint32_t mask, void *buffer, int size)
320 {
321 int i;
322 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
323 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
324 int be = (target->endianness == TARGET_BIG_ENDIAN) ? 1 : 0;
325 uint32_t *buf_u32 = buffer;
326 uint16_t *buf_u16 = buffer;
327 uint8_t *buf_u8 = buffer;
328
329 /* STMIA r0-15, [r0] at debug speed
330 * register values will start to appear on 4th DCLK
331 */
332 arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask & 0xffff, 0, 0), NULL, 0);
333
334 /* fetch NOP, STM in DECODE stage */
335 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
336 /* fetch NOP, STM in EXECUTE stage (1st cycle) */
337 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
338
339 for (i = 0; i <= 15; i++) {
340 /* nothing fetched, STM still in EXECUTE (1 + i cycle), read databus */
341 if (mask & (1 << i)) {
342 switch (size) {
343 case 4:
344 arm7tdmi_clock_data_in_endianness(jtag_info, buf_u32++, 4, be);
345 break;
346 case 2:
347 arm7tdmi_clock_data_in_endianness(jtag_info, buf_u16++, 2, be);
348 break;
349 case 1:
350 arm7tdmi_clock_data_in_endianness(jtag_info, buf_u8++, 1, be);
351 break;
352 }
353 }
354 }
355 }
356
357 static void arm7tdmi_read_xpsr(struct target *target, uint32_t *xpsr, int spsr)
358 {
359 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
360 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
361
362 /* MRS r0, cpsr */
363 arm7tdmi_clock_out(jtag_info, ARMV4_5_MRS(0, spsr & 1), NULL, 0);
364
365 /* STR r0, [r15] */
366 arm7tdmi_clock_out(jtag_info, ARMV4_5_STR(0, 15), NULL, 0);
367 /* fetch NOP, STR in DECODE stage */
368 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
369 /* fetch NOP, STR in EXECUTE stage (1st cycle) */
370 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
371 /* nothing fetched, STR still in EXECUTE (2nd cycle) */
372 arm7tdmi_clock_data_in(jtag_info, xpsr);
373 }
374
375 static void arm7tdmi_write_xpsr(struct target *target, uint32_t xpsr, int spsr)
376 {
377 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
378 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
379
380 LOG_DEBUG("xpsr: %8.8" PRIx32 ", spsr: %i", xpsr, spsr);
381
382 /* MSR1 fetched */
383 arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr & 0xff, 0, 1, spsr), NULL, 0);
384 /* MSR2 fetched, MSR1 in DECODE */
385 arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff00) >> 8, 0xc, 2, spsr), NULL, 0);
386 /* MSR3 fetched, MSR1 in EXECUTE (1), MSR2 in DECODE */
387 arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff0000) >> 16, 0x8, 4, spsr), NULL, 0);
388 /* nothing fetched, MSR1 in EXECUTE (2) */
389 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
390 /* MSR4 fetched, MSR2 in EXECUTE (1), MSR3 in DECODE */
391 arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM((xpsr & 0xff000000) >> 24, 0x4, 8, spsr), NULL, 0);
392 /* nothing fetched, MSR2 in EXECUTE (2) */
393 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
394 /* NOP fetched, MSR3 in EXECUTE (1), MSR4 in DECODE */
395 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
396 /* nothing fetched, MSR3 in EXECUTE (2) */
397 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
398 /* NOP fetched, MSR4 in EXECUTE (1) */
399 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
400 /* nothing fetched, MSR4 in EXECUTE (2) */
401 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
402 }
403
404 static void arm7tdmi_write_xpsr_im8(struct target *target,
405 uint8_t xpsr_im, int rot, int spsr)
406 {
407 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
408 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
409
410 LOG_DEBUG("xpsr_im: %2.2x, rot: %i, spsr: %i", xpsr_im, rot, spsr);
411
412 /* MSR fetched */
413 arm7tdmi_clock_out(jtag_info, ARMV4_5_MSR_IM(xpsr_im, rot, 1, spsr), NULL, 0);
414 /* NOP fetched, MSR in DECODE */
415 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
416 /* NOP fetched, MSR in EXECUTE (1) */
417 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
418 /* nothing fetched, MSR in EXECUTE (2) */
419 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
420 }
421
422 static void arm7tdmi_write_core_regs(struct target *target,
423 uint32_t mask, uint32_t core_regs[16])
424 {
425 int i;
426 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
427 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
428
429 /* LDMIA r0-15, [r0] at debug speed
430 * register values will start to appear on 4th DCLK
431 */
432 arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 0), NULL, 0);
433
434 /* fetch NOP, LDM in DECODE stage */
435 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
436 /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
437 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
438
439 for (i = 0; i <= 15; i++) {
440 if (mask & (1 << i))
441 /* nothing fetched, LDM still in EXECUTE (1 + i cycle) */
442 arm7tdmi_clock_out_inner(jtag_info, core_regs[i], 0);
443 }
444 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
445 }
446
447 static void arm7tdmi_load_word_regs(struct target *target, uint32_t mask)
448 {
449 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
450 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
451
452 /* put system-speed load-multiple into the pipeline */
453 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
454 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
455 arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, mask & 0xffff, 0, 1), NULL, 0);
456 }
457
458 static void arm7tdmi_load_hword_reg(struct target *target, int num)
459 {
460 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
461 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
462
463 /* put system-speed load half-word into the pipeline */
464 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
465 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
466 arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRH_IP(num, 0), NULL, 0);
467 }
468
469 static void arm7tdmi_load_byte_reg(struct target *target, int num)
470 {
471 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
472 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
473
474 /* put system-speed load byte into the pipeline */
475 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
476 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
477 arm7tdmi_clock_out(jtag_info, ARMV4_5_LDRB_IP(num, 0), NULL, 0);
478 }
479
480 static void arm7tdmi_store_word_regs(struct target *target, uint32_t mask)
481 {
482 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
483 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
484
485 /* put system-speed store-multiple into the pipeline */
486 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
487 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
488 arm7tdmi_clock_out(jtag_info, ARMV4_5_STMIA(0, mask, 0, 1), NULL, 0);
489 }
490
491 static void arm7tdmi_store_hword_reg(struct target *target, int num)
492 {
493 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
494 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
495
496 /* put system-speed store half-word into the pipeline */
497 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
498 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
499 arm7tdmi_clock_out(jtag_info, ARMV4_5_STRH_IP(num, 0), NULL, 0);
500 }
501
502 static void arm7tdmi_store_byte_reg(struct target *target, int num)
503 {
504 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
505 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
506
507 /* put system-speed store byte into the pipeline */
508 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
509 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
510 arm7tdmi_clock_out(jtag_info, ARMV4_5_STRB_IP(num, 0), NULL, 0);
511 }
512
513 static void arm7tdmi_write_pc(struct target *target, uint32_t pc)
514 {
515 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
516 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
517
518 /* LDMIA r0-15, [r0] at debug speed
519 * register values will start to appear on 4th DCLK
520 */
521 arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x8000, 0, 0), NULL, 0);
522 /* fetch NOP, LDM in DECODE stage */
523 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
524 /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
525 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
526 /* nothing fetched, LDM in EXECUTE stage (1st cycle) load register */
527 arm7tdmi_clock_out_inner(jtag_info, pc, 0);
528 /* nothing fetched, LDM in EXECUTE stage (2nd cycle) load register */
529 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
530 /* nothing fetched, LDM in EXECUTE stage (3rd cycle) load register */
531 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
532 /* fetch NOP, LDM in EXECUTE stage (4th cycle) */
533 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
534 /* fetch NOP, LDM in EXECUTE stage (5th cycle) */
535 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_NOP, 0);
536 }
537
538 static void arm7tdmi_branch_resume(struct target *target)
539 {
540 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
541 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
542
543 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 1);
544 arm7tdmi_clock_out_inner(jtag_info, ARMV4_5_B(0xfffffa, 0), 0);
545 }
546
547 static void arm7tdmi_branch_resume_thumb(struct target *target)
548 {
549 struct arm7_9_common *arm7_9 = target_to_arm7_9(target);
550 struct arm *arm = &arm7_9->arm;
551 struct arm_jtag *jtag_info = &arm7_9->jtag_info;
552 struct reg *dbg_stat = &arm7_9->eice_cache->reg_list[EICE_DBG_STAT];
553
554 LOG_DEBUG("-");
555
556 /* LDMIA r0, [r0] at debug speed
557 * register values will start to appear on 4th DCLK
558 */
559 arm7tdmi_clock_out(jtag_info, ARMV4_5_LDMIA(0, 0x1, 0, 0), NULL, 0);
560
561 /* fetch NOP, LDM in DECODE stage */
562 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
563 /* fetch NOP, LDM in EXECUTE stage (1st cycle) */
564 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
565 /* nothing fetched, LDM in EXECUTE stage (2nd cycle) */
566 arm7tdmi_clock_out(jtag_info,
567 buf_get_u32(arm->pc->value, 0, 32) | 1, NULL, 0);
568 /* nothing fetched, LDM in EXECUTE stage (3rd cycle) */
569 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
570
571 /* Branch and eXchange */
572 arm7tdmi_clock_out(jtag_info, ARMV4_5_BX(0), NULL, 0);
573
574 embeddedice_read_reg(dbg_stat);
575
576 /* fetch NOP, BX in DECODE stage */
577 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
578
579 /* target is now in Thumb state */
580 embeddedice_read_reg(dbg_stat);
581
582 /* fetch NOP, BX in EXECUTE stage (1st cycle) */
583 arm7tdmi_clock_out(jtag_info, ARMV4_5_NOP, NULL, 0);
584
585 /* target is now in Thumb state */
586 embeddedice_read_reg(dbg_stat);
587
588 /* load r0 value */
589 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_LDR_PCREL(0), NULL, 0);
590 /* fetch NOP, LDR in Decode */
591 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
592 /* fetch NOP, LDR in Execute */
593 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
594 /* nothing fetched, LDR in EXECUTE stage (2nd cycle) */
595 arm7tdmi_clock_out(jtag_info, buf_get_u32(arm->core_cache->reg_list[0].value, 0, 32), NULL, 0);
596 /* nothing fetched, LDR in EXECUTE stage (3rd cycle) */
597 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
598
599 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
600 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 0);
601
602 embeddedice_read_reg(dbg_stat);
603
604 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, NULL, 1);
605 arm7tdmi_clock_out(jtag_info, ARMV4_5_T_B(0x7f8), NULL, 0);
606 }
607
608 static void arm7tdmi_build_reg_cache(struct target *target)
609 {
610 struct reg_cache **cache_p = register_get_last_cache_p(&target->reg_cache);
611 struct arm *arm = target_to_arm(target);
612
613 (*cache_p) = arm_build_reg_cache(target, arm);
614 }
615
616 int arm7tdmi_init_target(struct command_context *cmd_ctx, struct target *target)
617 {
618 arm7tdmi_build_reg_cache(target);
619 arm_semihosting_init(target);
620 return ERROR_OK;
621 }
622
623 int arm7tdmi_init_arch_info(struct target *target,
624 struct arm7_9_common *arm7_9, struct jtag_tap *tap)
625 {
626 /* prepare JTAG information for the new target */
627 arm7_9->jtag_info.tap = tap;
628 arm7_9->jtag_info.scann_size = 4;
629
630 /* register arch-specific functions */
631 arm7_9->examine_debug_reason = arm7tdmi_examine_debug_reason;
632 arm7_9->change_to_arm = arm7tdmi_change_to_arm;
633 arm7_9->read_core_regs = arm7tdmi_read_core_regs;
634 arm7_9->read_core_regs_target_buffer = arm7tdmi_read_core_regs_target_buffer;
635 arm7_9->read_xpsr = arm7tdmi_read_xpsr;
636
637 arm7_9->write_xpsr = arm7tdmi_write_xpsr;
638 arm7_9->write_xpsr_im8 = arm7tdmi_write_xpsr_im8;
639 arm7_9->write_core_regs = arm7tdmi_write_core_regs;
640
641 arm7_9->load_word_regs = arm7tdmi_load_word_regs;
642 arm7_9->load_hword_reg = arm7tdmi_load_hword_reg;
643 arm7_9->load_byte_reg = arm7tdmi_load_byte_reg;
644
645 arm7_9->store_word_regs = arm7tdmi_store_word_regs;
646 arm7_9->store_hword_reg = arm7tdmi_store_hword_reg;
647 arm7_9->store_byte_reg = arm7tdmi_store_byte_reg;
648
649 arm7_9->write_pc = arm7tdmi_write_pc;
650 arm7_9->branch_resume = arm7tdmi_branch_resume;
651 arm7_9->branch_resume_thumb = arm7tdmi_branch_resume_thumb;
652
653 arm7_9->enable_single_step = arm7_9_enable_eice_step;
654 arm7_9->disable_single_step = arm7_9_disable_eice_step;
655
656 arm7_9->write_memory = arm7_9_write_memory;
657 arm7_9->bulk_write_memory = arm7_9_bulk_write_memory;
658
659 arm7_9->post_debug_entry = NULL;
660
661 arm7_9->pre_restore_context = NULL;
662
663 /* initialize arch-specific breakpoint handling */
664 arm7_9->arm_bkpt = 0xdeeedeee;
665 arm7_9->thumb_bkpt = 0xdeee;
666
667 arm7_9->dbgreq_adjust_pc = 2;
668
669 arm7_9_init_arch_info(target, arm7_9);
670
671 return ERROR_OK;
672 }
673
674 static int arm7tdmi_target_create(struct target *target, Jim_Interp *interp)
675 {
676 struct arm7_9_common *arm7_9;
677
678 arm7_9 = calloc(1, sizeof(struct arm7_9_common));
679 arm7tdmi_init_arch_info(target, arm7_9, target->tap);
680 arm7_9->arm.is_armv4 = true;
681
682 return ERROR_OK;
683 }
684
685 /** Holds methods for ARM7TDMI targets. */
686 struct target_type arm7tdmi_target = {
687 .name = "arm7tdmi",
688
689 .poll = arm7_9_poll,
690 .arch_state = arm_arch_state,
691
692 .target_request_data = arm7_9_target_request_data,
693
694 .halt = arm7_9_halt,
695 .resume = arm7_9_resume,
696 .step = arm7_9_step,
697
698 .assert_reset = arm7_9_assert_reset,
699 .deassert_reset = arm7_9_deassert_reset,
700 .soft_reset_halt = arm7_9_soft_reset_halt,
701
702 .get_gdb_reg_list = arm_get_gdb_reg_list,
703
704 .read_memory = arm7_9_read_memory,
705 .write_memory = arm7_9_write_memory_opt,
706
707 .checksum_memory = arm_checksum_memory,
708 .blank_check_memory = arm_blank_check_memory,
709
710 .run_algorithm = armv4_5_run_algorithm,
711
712 .add_breakpoint = arm7_9_add_breakpoint,
713 .remove_breakpoint = arm7_9_remove_breakpoint,
714 .add_watchpoint = arm7_9_add_watchpoint,
715 .remove_watchpoint = arm7_9_remove_watchpoint,
716
717 .commands = arm7_9_command_handlers,
718 .target_create = arm7tdmi_target_create,
719 .init_target = arm7tdmi_init_target,
720 .examine = arm7_9_examine,
721 .check_reset = arm7_9_check_reset,
722 };
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