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 #include "register.h"
  31
  32
  33 char* mips32_core_reg_list[] =
  34 {
  35         "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3",
  36         "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7",
  37         "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
  38         "t8", "t9", "k0", "k1", "gp", "sp", "fp", "ra",
  39         "status", "lo", "hi", "badvaddr", "cause", "pc"
  40 };
  41
  42 struct mips32_core_reg mips32_core_reg_list_arch_info[MIPS32NUMCOREREGS] =
  43 {
  44         {0, NULL, NULL},
  45         {1, NULL, NULL},
  46         {2, NULL, NULL},
  47         {3, NULL, NULL},
  48         {4, NULL, NULL},
  49         {5, NULL, NULL},
  50         {6, NULL, NULL},
  51         {7, NULL, NULL},
  52         {8, NULL, NULL},
  53         {9, NULL, NULL},
  54         {10, NULL, NULL},
  55         {11, NULL, NULL},
  56         {12, NULL, NULL},
  57         {13, NULL, NULL},
  58         {14, NULL, NULL},
  59         {15, NULL, NULL},
  60         {16, NULL, NULL},
  61         {17, NULL, NULL},
  62         {18, NULL, NULL},
  63         {19, NULL, NULL},
  64         {20, NULL, NULL},
  65         {21, NULL, NULL},
  66         {22, NULL, NULL},
  67         {23, NULL, NULL},
  68         {24, NULL, NULL},
  69         {25, NULL, NULL},
  70         {26, NULL, NULL},
  71         {27, NULL, NULL},
  72         {28, NULL, NULL},
  73         {29, NULL, NULL},
  74         {30, NULL, NULL},
  75         {31, NULL, NULL},
  76
  77         {32, NULL, NULL},
  78         {33, NULL, NULL},
  79         {34, NULL, NULL},
  80         {35, NULL, NULL},
  81         {36, NULL, NULL},
  82         {37, NULL, NULL},
  83 };
  84
  85 /* number of mips dummy fp regs fp0 - fp31 + fsr and fir
  86  * we also add 18 unknown registers to handle gdb requests */
  87
  88 #define MIPS32NUMFPREGS 34 + 18
  89
  90 uint8_t mips32_gdb_dummy_fp_value[] = {0, 0, 0, 0};
  91
  92 struct reg mips32_gdb_dummy_fp_reg =
  93 {
  94         .name = "GDB dummy floating-point register",
  95         .value = mips32_gdb_dummy_fp_value,
  96         .dirty = 0,
  97         .valid = 1,
  98         .size = 32,
  99         .arch_info = NULL,
 100 };
 101
 102 int mips32_get_core_reg(struct reg *reg)
 103 {
 104         int retval;
 105         struct mips32_core_reg *mips32_reg = reg->arch_info;
 106         struct target *target = mips32_reg->target;
 107         struct mips32_common *mips32_target = target->arch_info;
 108
 109         if (target->state != TARGET_HALTED)
 110         {
 111                 return ERROR_TARGET_NOT_HALTED;
 112         }
 113
 114         retval = mips32_target->read_core_reg(target, mips32_reg->num);
 115
 116         return retval;
 117 }
 118
 119 int mips32_set_core_reg(struct reg *reg, uint8_t *buf)
 120 {
 121         struct mips32_core_reg *mips32_reg = reg->arch_info;
 122         struct target *target = mips32_reg->target;
 123         uint32_t value = buf_get_u32(buf, 0, 32);
 124
 125         if (target->state != TARGET_HALTED)
 126         {
 127                 return ERROR_TARGET_NOT_HALTED;
 128         }
 129
 130         buf_set_u32(reg->value, 0, 32, value);
 131         reg->dirty = 1;
 132         reg->valid = 1;
 133
 134         return ERROR_OK;
 135 }
 136
 137 int mips32_read_core_reg(struct target *target, int num)
 138 {
 139         uint32_t reg_value;
 140         struct mips32_core_reg *mips_core_reg;
 141
 142         /* get pointers to arch-specific information */
 143         struct mips32_common *mips32 = target->arch_info;
 144
 145         if ((num < 0) || (num >= MIPS32NUMCOREREGS))
 146                 return ERROR_INVALID_ARGUMENTS;
 147
 148         mips_core_reg = mips32->core_cache->reg_list[num].arch_info;
 149         reg_value = mips32->core_regs[num];
 150         buf_set_u32(mips32->core_cache->reg_list[num].value, 0, 32, reg_value);
 151         mips32->core_cache->reg_list[num].valid = 1;
 152         mips32->core_cache->reg_list[num].dirty = 0;
 153
 154         return ERROR_OK;
 155 }
 156
 157 int mips32_write_core_reg(struct target *target, int num)
 158 {
 159         uint32_t reg_value;
 160         struct mips32_core_reg *mips_core_reg;
 161
 162         /* get pointers to arch-specific information */
 163         struct mips32_common *mips32 = target->arch_info;
 164
 165         if ((num < 0) || (num >= MIPS32NUMCOREREGS))
 166                 return ERROR_INVALID_ARGUMENTS;
 167
 168         reg_value = buf_get_u32(mips32->core_cache->reg_list[num].value, 0, 32);
 169         mips_core_reg = mips32->core_cache->reg_list[num].arch_info;
 170         mips32->core_regs[num] = reg_value;
 171         LOG_DEBUG("write core reg %i value 0x%" PRIx32 "", num , reg_value);
 172         mips32->core_cache->reg_list[num].valid = 1;
 173         mips32->core_cache->reg_list[num].dirty = 0;
 174
 175         return ERROR_OK;
 176 }
 177
 178 int mips32_get_gdb_reg_list(struct target *target, struct reg **reg_list[], int *reg_list_size)
 179 {
 180         /* get pointers to arch-specific information */
 181         struct mips32_common *mips32 = target->arch_info;
 182         int i;
 183
 184         /* include floating point registers */
 185         *reg_list_size = MIPS32NUMCOREREGS + MIPS32NUMFPREGS;
 186         *reg_list = malloc(sizeof(struct reg*) * (*reg_list_size));
 187
 188         for (i = 0; i < MIPS32NUMCOREREGS; i++)
 189         {
 190                 (*reg_list)[i] = &mips32->core_cache->reg_list[i];
 191         }
 192
 193         /* add dummy floating points regs */
 194         for (i = MIPS32NUMCOREREGS; i < (MIPS32NUMCOREREGS + MIPS32NUMFPREGS); i++)
 195         {
 196                 (*reg_list)[i] = &mips32_gdb_dummy_fp_reg;
 197         }
 198
 199         return ERROR_OK;
 200 }
 201
 202 int mips32_save_context(struct target *target)
 203 {
 204         int i;
 205
 206         /* get pointers to arch-specific information */
 207         struct mips32_common *mips32 = target->arch_info;
 208         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 209
 210         /* read core registers */
 211         mips32_pracc_read_regs(ejtag_info, mips32->core_regs);
 212
 213         for (i = 0; i < MIPS32NUMCOREREGS; i++)
 214         {
 215                 if (!mips32->core_cache->reg_list[i].valid)
 216                 {
 217                         mips32->read_core_reg(target, i);
 218                 }
 219         }
 220
 221         return ERROR_OK;
 222 }
 223
 224 int mips32_restore_context(struct target *target)
 225 {
 226         int i;
 227
 228         /* get pointers to arch-specific information */
 229         struct mips32_common *mips32 = target->arch_info;
 230         struct mips_ejtag *ejtag_info = &mips32->ejtag_info;
 231
 232         for (i = 0; i < MIPS32NUMCOREREGS; i++)
 233         {
 234                 if (mips32->core_cache->reg_list[i].dirty)
 235                 {
 236                         mips32->write_core_reg(target, i);
 237                 }
 238         }
 239
 240         /* write core regs */
 241         mips32_pracc_write_regs(ejtag_info, mips32->core_regs);
 242
 243         return ERROR_OK;
 244 }
 245
 246 int mips32_arch_state(struct target *target)
 247 {
 248         struct mips32_common *mips32 = target->arch_info;
 249
 250         if (mips32->common_magic != MIPS32_COMMON_MAGIC)
 251         {
 252                 LOG_ERROR("BUG: called for a non-MIPS32 target");
 253                 return ERROR_FAIL;
 254         }
 255
 256         LOG_USER("target halted due to %s, pc: 0x%8.8" PRIx32 "",
 257                 debug_reason_name(target),
 258                 buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32));
 259
 260         return ERROR_OK;
 261 }
 262
 263 static const struct reg_arch_type mips32_reg_type = {
 264         .get = mips32_get_core_reg,
 265         .set = mips32_set_core_reg,
 266 };
 267
 268 struct reg_cache *mips32_build_reg_cache(struct target *target)
 269 {
 270         /* get pointers to arch-specific information */
 271         struct mips32_common *mips32 = target->arch_info;
 272
 273         int num_regs = MIPS32NUMCOREREGS;
 274         struct reg_cache **cache_p = register_get_last_cache_p(&target->reg_cache);
 275         struct reg_cache *cache = malloc(sizeof(struct reg_cache));
 276         struct reg *reg_list = malloc(sizeof(struct reg) * num_regs);
 277         struct mips32_core_reg *arch_info = malloc(sizeof(struct mips32_core_reg) * num_regs);
 278         int i;
 279
 280         register_init_dummy(&mips32_gdb_dummy_fp_reg);
 281
 282         /* Build the process context cache */
 283         cache->name = "mips32 registers";
 284         cache->next = NULL;
 285         cache->reg_list = reg_list;
 286         cache->num_regs = num_regs;
 287         (*cache_p) = cache;
 288         mips32->core_cache = cache;
 289
 290         for (i = 0; i < num_regs; i++)
 291         {
 292                 arch_info[i] = mips32_core_reg_list_arch_info[i];
 293                 arch_info[i].target = target;
 294                 arch_info[i].mips32_common = mips32;
 295                 reg_list[i].name = mips32_core_reg_list[i];
 296                 reg_list[i].size = 32;
 297                 reg_list[i].value = calloc(1, 4);
 298                 reg_list[i].dirty = 0;
 299                 reg_list[i].valid = 0;
 300                 reg_list[i].type = &mips32_reg_type;
 301                 reg_list[i].arch_info = &arch_info[i];
 302         }
 303
 304         return cache;
 305 }
 306
 307 int mips32_init_arch_info(struct target *target, struct mips32_common *mips32, struct jtag_tap *tap)
 308 {
 309         target->arch_info = mips32;
 310         mips32->common_magic = MIPS32_COMMON_MAGIC;
 311
 312         /* has breakpoint/watchpint unit been scanned */
 313         mips32->bp_scanned = 0;
 314         mips32->data_break_list = NULL;
 315
 316         mips32->ejtag_info.tap = tap;
 317         mips32->read_core_reg = mips32_read_core_reg;
 318         mips32->write_core_reg = mips32_write_core_reg;
 319
 320         return ERROR_OK;
 321 }
 322
 323 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)
 324 {
 325         /*TODO*/
 326         return ERROR_OK;
 327 }
 328
 329 int mips32_examine(struct target *target)
 330 {
 331         struct mips32_common *mips32 = target->arch_info;
 332
 333         if (!target_was_examined(target))
 334         {
 335                 target_set_examined(target);
 336
 337                 /* we will configure later */
 338                 mips32->bp_scanned = 0;
 339                 mips32->num_inst_bpoints = 0;
 340                 mips32->num_data_bpoints = 0;
 341                 mips32->num_inst_bpoints_avail = 0;
 342                 mips32->num_data_bpoints_avail = 0;
 343         }
 344
 345         return ERROR_OK;
 346 }
 347
 348 int mips32_configure_break_unit(struct target *target)
 349 {
 350         /* get pointers to arch-specific information */
 351         struct mips32_common *mips32 = target->arch_info;
 352         int retval;
 353         uint32_t dcr, bpinfo;
 354         int i;
 355
 356         if (mips32->bp_scanned)
 357                 return ERROR_OK;
 358
 359         /* get info about breakpoint support */
 360         if ((retval = target_read_u32(target, EJTAG_DCR, &dcr)) != ERROR_OK)
 361                 return retval;
 362
 363         if (dcr & (1 << 16))
 364         {
 365                 /* get number of inst breakpoints */
 366                 if ((retval = target_read_u32(target, EJTAG_IBS, &bpinfo)) != ERROR_OK)
 367                         return retval;
 368
 369                 mips32->num_inst_bpoints = (bpinfo >> 24) & 0x0F;
 370                 mips32->num_inst_bpoints_avail = mips32->num_inst_bpoints;
 371                 mips32->inst_break_list = calloc(mips32->num_inst_bpoints, sizeof(struct mips32_comparator));
 372                 for (i = 0; i < mips32->num_inst_bpoints; i++)
 373                 {
 374                         mips32->inst_break_list[i].reg_address = EJTAG_IBA1 + (0x100 * i);
 375                 }
 376
 377                 /* clear IBIS reg */
 378                 if ((retval = target_write_u32(target, EJTAG_IBS, 0)) != ERROR_OK)
 379                         return retval;
 380         }
 381
 382         if (dcr & (1 << 17))
 383         {
 384                 /* get number of data breakpoints */
 385                 if ((retval = target_read_u32(target, EJTAG_DBS, &bpinfo)) != ERROR_OK)
 386                         return retval;
 387
 388                 mips32->num_data_bpoints = (bpinfo >> 24) & 0x0F;
 389                 mips32->num_data_bpoints_avail = mips32->num_data_bpoints;
 390                 mips32->data_break_list = calloc(mips32->num_data_bpoints, sizeof(struct mips32_comparator));
 391                 for (i = 0; i < mips32->num_data_bpoints; i++)
 392                 {
 393                         mips32->data_break_list[i].reg_address = EJTAG_DBA1 + (0x100 * i);
 394                 }
 395
 396                 /* clear DBIS reg */
 397                 if ((retval = target_write_u32(target, EJTAG_DBS, 0)) != ERROR_OK)
 398                         return retval;
 399         }
 400
 401         LOG_DEBUG("DCR 0x%" PRIx32 " numinst %i numdata %i", dcr, mips32->num_inst_bpoints, mips32->num_data_bpoints);
 402
 403         mips32->bp_scanned = 1;
 404
 405         return ERROR_OK;
 406 }
 407
 408 int mips32_enable_interrupts(struct target *target, int enable)
 409 {
 410         int retval;
 411         int update = 0;
 412         uint32_t dcr;
 413
 414         /* read debug control register */
 415         if ((retval = target_read_u32(target, EJTAG_DCR, &dcr)) != ERROR_OK)
 416                 return retval;
 417
 418         if (enable)
 419         {
 420                 if (!(dcr & (1 << 4)))
 421                 {
 422                         /* enable interrupts */
 423                         dcr |= (1 << 4);
 424                         update = 1;
 425                 }
 426         }
 427         else
 428         {
 429                 if (dcr & (1 << 4))
 430                 {
 431                         /* disable interrupts */
 432                         dcr &= ~(1 << 4);
 433                         update = 1;
 434                 }
 435         }
 436
 437         if (update)
 438         {
 439                 if ((retval = target_write_u32(target, EJTAG_DCR, dcr)) != ERROR_OK)
 440                         return retval;
 441         }
 442
 443         return ERROR_OK;
 444 }