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[openocd.git] / src / target / mips32.c
1 /***************************************************************************
2 * Copyright (C) 2008 by Spencer Oliver *
3 * spen@spen-soft.co.uk *
4 * *
5 * Copyright (C) 2008 by David T.L. Wong *
6 * *
7 * Copyright (C) 2007,2008 Øyvind Harboe *
8 * oyvind.harboe@zylin.com *
9 * *
10 * This program is free software; you can redistribute it and/or modify *
11 * it under the terms of the GNU General Public License as published by *
12 * the Free Software Foundation; either version 2 of the License, or *
13 * (at your option) any later version. *
14 * *
15 * This program is distributed in the hope that it will be useful, *
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
18 * GNU General Public License for more details. *
19 * *
20 * You should have received a copy of the GNU General Public License *
21 * along with this program; if not, write to the *
22 * Free Software Foundation, Inc., *
23 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
24 ***************************************************************************/
25 #ifdef HAVE_CONFIG_H
26 #include "config.h"
27 #endif
28
29 #include "mips32.h"
30
31
32 char* mips32_core_reg_list[] =
33 {
34 "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3",
35 "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7",
36 "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
37 "t8", "t9", "k0", "k1", "gp", "sp", "fp", "ra",
38 "status", "lo", "hi", "badvaddr", "cause", "pc"
39 };
40
41 struct mips32_core_reg mips32_core_reg_list_arch_info[MIPS32NUMCOREREGS] =
42 {
43 {0, NULL, NULL},
44 {1, NULL, NULL},
45 {2, NULL, NULL},
46 {3, NULL, NULL},
47 {4, NULL, NULL},
48 {5, NULL, NULL},
49 {6, NULL, NULL},
50 {7, NULL, NULL},
51 {8, NULL, NULL},
52 {9, NULL, NULL},
53 {10, NULL, NULL},
54 {11, NULL, NULL},
55 {12, NULL, NULL},
56 {13, NULL, NULL},
57 {14, NULL, NULL},
58 {15, NULL, NULL},
59 {16, NULL, NULL},
60 {17, NULL, NULL},
61 {18, NULL, NULL},
62 {19, NULL, NULL},
63 {20, NULL, NULL},
64 {21, NULL, NULL},
65 {22, NULL, NULL},
66 {23, NULL, NULL},
67 {24, NULL, NULL},
68 {25, NULL, NULL},
69 {26, NULL, NULL},
70 {27, NULL, NULL},
71 {28, NULL, NULL},
72 {29, NULL, NULL},
73 {30, NULL, NULL},
74 {31, NULL, NULL},
75
76 {32, NULL, NULL},
77 {33, NULL, NULL},
78 {34, NULL, NULL},
79 {35, NULL, NULL},
80 {36, NULL, NULL},
81 {37, NULL, NULL},
82 };
83
84 /* number of mips dummy fp regs fp0 - fp31 + fsr and fir
85 * we also add 18 unknown registers to handle gdb requests */
86
87 #define MIPS32NUMFPREGS 34 + 18
88
89 uint8_t mips32_gdb_dummy_fp_value[] = {0, 0, 0, 0};
90
91 struct reg mips32_gdb_dummy_fp_reg =
92 {
93 "GDB dummy floating-point register", mips32_gdb_dummy_fp_value, 0, 1, 32, NULL, 0, NULL, 0
94 };
95
96 int mips32_core_reg_arch_type = -1;
97
98 int mips32_get_core_reg(struct reg *reg)
99 {
100 int retval;
101 struct mips32_core_reg *mips32_reg = reg->arch_info;
102 struct target *target = mips32_reg->target;
103 struct mips32_common *mips32_target = target->arch_info;
104
105 if (target->state != TARGET_HALTED)
106 {
107 return ERROR_TARGET_NOT_HALTED;
108 }
109
110 retval = mips32_target->read_core_reg(target, mips32_reg->num);
111
112 return retval;
113 }
114
115 int mips32_set_core_reg(struct reg *reg, uint8_t *buf)
116 {
117 struct mips32_core_reg *mips32_reg = reg->arch_info;
118 struct target *target = mips32_reg->target;
119 uint32_t value = buf_get_u32(buf, 0, 32);
120
121 if (target->state != TARGET_HALTED)
122 {
123 return ERROR_TARGET_NOT_HALTED;
124 }
125
126 buf_set_u32(reg->value, 0, 32, value);
127 reg->dirty = 1;
128 reg->valid = 1;
129
130 return ERROR_OK;
131 }
132
133 int mips32_read_core_reg(struct target *target, int num)
134 {
135 uint32_t reg_value;
136 struct mips32_core_reg *mips_core_reg;
137
138 /* get pointers to arch-specific information */
139 struct mips32_common *mips32 = target->arch_info;
140
141 if ((num < 0) || (num >= MIPS32NUMCOREREGS))
142 return ERROR_INVALID_ARGUMENTS;
143
144 mips_core_reg = mips32->core_cache->reg_list[num].arch_info;
145 reg_value = mips32->core_regs[num];
146 buf_set_u32(mips32->core_cache->reg_list[num].value, 0, 32, reg_value);
147 mips32->core_cache->reg_list[num].valid = 1;
148 mips32->core_cache->reg_list[num].dirty = 0;
149
150 return ERROR_OK;
151 }
152
153 int mips32_write_core_reg(struct target *target, int num)
154 {
155 uint32_t reg_value;
156 struct mips32_core_reg *mips_core_reg;
157
158 /* get pointers to arch-specific information */
159 struct mips32_common *mips32 = target->arch_info;
160
161 if ((num < 0) || (num >= MIPS32NUMCOREREGS))
162 return ERROR_INVALID_ARGUMENTS;
163
164 reg_value = buf_get_u32(mips32->core_cache->reg_list[num].value, 0, 32);
165 mips_core_reg = mips32->core_cache->reg_list[num].arch_info;
166 mips32->core_regs[num] = reg_value;
167 LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", num , reg_value);
168 mips32->core_cache->reg_list[num].valid = 1;
169 mips32->core_cache->reg_list[num].dirty = 0;
170
171 return ERROR_OK;
172 }
173
174 int mips32_invalidate_core_regs(struct target *target)
175 {
176 /* get pointers to arch-specific information */
177 struct mips32_common *mips32 = target->arch_info;
178 int i;
179
180 for (i = 0; i < mips32->core_cache->num_regs; i++)
181 {
182 mips32->core_cache->reg_list[i].valid = 0;
183 mips32->core_cache->reg_list[i].dirty = 0;
184 }
185
186 return ERROR_OK;
187 }
188
189 int mips32_get_gdb_reg_list(struct target *target, struct reg **reg_list[], int *reg_list_size)
190 {
191 /* get pointers to arch-specific information */
192 struct mips32_common *mips32 = target->arch_info;
193 int i;
194
195 /* include floating point registers */
196 *reg_list_size = MIPS32NUMCOREREGS + MIPS32NUMFPREGS;
197 *reg_list = malloc(sizeof(struct reg*) * (*reg_list_size));
198
199 for (i = 0; i < MIPS32NUMCOREREGS; i++)
200 {
201 (*reg_list)[i] = &mips32->core_cache->reg_list[i];
202 }
203
204 /* add dummy floating points regs */
205 for (i = MIPS32NUMCOREREGS; i < (MIPS32NUMCOREREGS + MIPS32NUMFPREGS); i++)
206 {
207 (*reg_list)[i] = &mips32_gdb_dummy_fp_reg;
208 }
209
210 return ERROR_OK;
211 }
212
213 int mips32_save_context(struct target *target)
214 {
215 int i;
216
217 /* get pointers to arch-specific information */
218 struct mips32_common *mips32 = target->arch_info;
219 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
220
221 /* read core registers */
222 mips32_pracc_read_regs(ejtag_info, mips32->core_regs);
223
224 for (i = 0; i < MIPS32NUMCOREREGS; i++)
225 {
226 if (!mips32->core_cache->reg_list[i].valid)
227 {
228 mips32->read_core_reg(target, i);
229 }
230 }
231
232 return ERROR_OK;
233 }
234
235 int mips32_restore_context(struct target *target)
236 {
237 int i;
238
239 /* get pointers to arch-specific information */
240 struct mips32_common *mips32 = target->arch_info;
241 struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
242
243 for (i = 0; i < MIPS32NUMCOREREGS; i++)
244 {
245 if (mips32->core_cache->reg_list[i].dirty)
246 {
247 mips32->write_core_reg(target, i);
248 }
249 }
250
251 /* write core regs */
252 mips32_pracc_write_regs(ejtag_info, mips32->core_regs);
253
254 return ERROR_OK;
255 }
256
257 int mips32_arch_state(struct target *target)
258 {
259 struct mips32_common *mips32 = target->arch_info;
260
261 if (mips32->common_magic != MIPS32_COMMON_MAGIC)
262 {
263 LOG_ERROR("BUG: called for a non-MIPS32 target");
264 exit(-1);
265 }
266
267 LOG_USER("target halted due to %s, pc: 0x%8.8" PRIx32 "",
268 Jim_Nvp_value2name_simple(nvp_target_debug_reason, target->debug_reason)->name ,
269 buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32));
270
271 return ERROR_OK;
272 }
273
274 struct reg_cache *mips32_build_reg_cache(struct target *target)
275 {
276 /* get pointers to arch-specific information */
277 struct mips32_common *mips32 = target->arch_info;
278
279 int num_regs = MIPS32NUMCOREREGS;
280 struct reg_cache **cache_p = register_get_last_cache_p(&target->reg_cache);
281 struct reg_cache *cache = malloc(sizeof(struct reg_cache));
282 struct reg *reg_list = malloc(sizeof(struct reg) * num_regs);
283 struct mips32_core_reg *arch_info = malloc(sizeof(struct mips32_core_reg) * num_regs);
284 int i;
285
286 if (mips32_core_reg_arch_type == -1)
287 mips32_core_reg_arch_type = register_reg_arch_type(mips32_get_core_reg, mips32_set_core_reg);
288
289 register_init_dummy(&mips32_gdb_dummy_fp_reg);
290
291 /* Build the process context cache */
292 cache->name = "mips32 registers";
293 cache->next = NULL;
294 cache->reg_list = reg_list;
295 cache->num_regs = num_regs;
296 (*cache_p) = cache;
297 mips32->core_cache = cache;
298
299 for (i = 0; i < num_regs; i++)
300 {
301 arch_info[i] = mips32_core_reg_list_arch_info[i];
302 arch_info[i].target = target;
303 arch_info[i].mips32_common = mips32;
304 reg_list[i].name = mips32_core_reg_list[i];
305 reg_list[i].size = 32;
306 reg_list[i].value = calloc(1, 4);
307 reg_list[i].dirty = 0;
308 reg_list[i].valid = 0;
309 reg_list[i].bitfield_desc = NULL;
310 reg_list[i].num_bitfields = 0;
311 reg_list[i].arch_type = mips32_core_reg_arch_type;
312 reg_list[i].arch_info = &arch_info[i];
313 }
314
315 return cache;
316 }
317
318 int mips32_init_arch_info(struct target *target, struct mips32_common *mips32, struct jtag_tap *tap)
319 {
320 target->arch_info = mips32;
321 mips32->common_magic = MIPS32_COMMON_MAGIC;
322
323 /* has breakpoint/watchpint unit been scanned */
324 mips32->bp_scanned = 0;
325 mips32->data_break_list = NULL;
326
327 mips32->ejtag_info.tap = tap;
328 mips32->read_core_reg = mips32_read_core_reg;
329 mips32->write_core_reg = mips32_write_core_reg;
330
331 return ERROR_OK;
332 }
333
334 int mips32_register_commands(struct command_context_s *cmd_ctx)
335 {
336 return ERROR_OK;
337 }
338
339 int mips32_run_algorithm(struct target *target, int num_mem_params, struct mem_param *mem_params, int num_reg_params, struct reg_param *reg_params, uint32_t entry_point, uint32_t exit_point, int timeout_ms, void *arch_info)
340 {
341 /*TODO*/
342 return ERROR_OK;
343 }
344
345 int mips32_examine(struct target *target)
346 {
347 struct mips32_common *mips32 = target->arch_info;
348
349 if (!target_was_examined(target))
350 {
351 target_set_examined(target);
352
353 /* we will configure later */
354 mips32->bp_scanned = 0;
355 mips32->num_inst_bpoints = 0;
356 mips32->num_data_bpoints = 0;
357 mips32->num_inst_bpoints_avail = 0;
358 mips32->num_data_bpoints_avail = 0;
359 }
360
361 return ERROR_OK;
362 }
363
364 int mips32_configure_break_unit(struct target *target)
365 {
366 /* get pointers to arch-specific information */
367 struct mips32_common *mips32 = target->arch_info;
368 int retval;
369 uint32_t dcr, bpinfo;
370 int i;
371
372 if (mips32->bp_scanned)
373 return ERROR_OK;
374
375 /* get info about breakpoint support */
376 if ((retval = target_read_u32(target, EJTAG_DCR, &dcr)) != ERROR_OK)
377 return retval;
378
379 if (dcr & (1 << 16))
380 {
381 /* get number of inst breakpoints */
382 if ((retval = target_read_u32(target, EJTAG_IBS, &bpinfo)) != ERROR_OK)
383 return retval;
384
385 mips32->num_inst_bpoints = (bpinfo >> 24) & 0x0F;
386 mips32->num_inst_bpoints_avail = mips32->num_inst_bpoints;
387 mips32->inst_break_list = calloc(mips32->num_inst_bpoints, sizeof(struct mips32_comparator));
388 for (i = 0; i < mips32->num_inst_bpoints; i++)
389 {
390 mips32->inst_break_list[i].reg_address = EJTAG_IBA1 + (0x100 * i);
391 }
392
393 /* clear IBIS reg */
394 if ((retval = target_write_u32(target, EJTAG_IBS, 0)) != ERROR_OK)
395 return retval;
396 }
397
398 if (dcr & (1 << 17))
399 {
400 /* get number of data breakpoints */
401 if ((retval = target_read_u32(target, EJTAG_DBS, &bpinfo)) != ERROR_OK)
402 return retval;
403
404 mips32->num_data_bpoints = (bpinfo >> 24) & 0x0F;
405 mips32->num_data_bpoints_avail = mips32->num_data_bpoints;
406 mips32->data_break_list = calloc(mips32->num_data_bpoints, sizeof(struct mips32_comparator));
407 for (i = 0; i < mips32->num_data_bpoints; i++)
408 {
409 mips32->data_break_list[i].reg_address = EJTAG_DBA1 + (0x100 * i);
410 }
411
412 /* clear DBIS reg */
413 if ((retval = target_write_u32(target, EJTAG_DBS, 0)) != ERROR_OK)
414 return retval;
415 }
416
417 LOG_DEBUG("DCR 0x%" PRIx32 " numinst %i numdata %i", dcr, mips32->num_inst_bpoints, mips32->num_data_bpoints);
418
419 mips32->bp_scanned = 1;
420
421 return ERROR_OK;
422 }
423
424 int mips32_enable_interrupts(struct target *target, int enable)
425 {
426 int retval;
427 int update = 0;
428 uint32_t dcr;
429
430 /* read debug control register */
431 if ((retval = target_read_u32(target, EJTAG_DCR, &dcr)) != ERROR_OK)
432 return retval;
433
434 if (enable)
435 {
436 if (!(dcr & (1 << 4)))
437 {
438 /* enable interrupts */
439 dcr |= (1 << 4);
440 update = 1;
441 }
442 }
443 else
444 {
445 if (dcr & (1 << 4))
446 {
447 /* disable interrupts */
448 dcr &= ~(1 << 4);
449 update = 1;
450 }
451 }
452
453 if (update)
454 {
455 if ((retval = target_write_u32(target, EJTAG_DCR, dcr)) != ERROR_OK)
456 return retval;
457 }
458
459 return ERROR_OK;
460 }
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