git.sur5r.net Git - openocd/blob - 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 "jtag.h"
  31 #include "log.h"
  32
  33 #include <stdlib.h>
  34 #include <string.h>
  35
  36 char* mips32_core_reg_list[] =
  37 {
  38         "zero", "at", "v0", "v1", "a0", "a1", "a2", "a3",
  39         "t0", "t1", "t2", "t3", "t4", "t5", "t6", "t7",
  40         "s0", "s1", "s2", "s3", "s4", "s5", "s6", "s7",
  41         "t8", "t9", "k0", "k1", "gp", "sp", "fp", "ra",
  42         "status", "lo", "hi", "badvaddr", "cause", "pc"
  43 };
  44
  45 mips32_core_reg_t mips32_core_reg_list_arch_info[MIPS32NUMCOREREGS] =
  46 {
  47         {0, NULL, NULL},
  48         {1, NULL, NULL},
  49         {2, NULL, NULL},
  50         {3, NULL, NULL},
  51         {4, NULL, NULL},
  52         {5, NULL, NULL},
  53         {6, NULL, NULL},
  54         {7, NULL, NULL},
  55         {8, NULL, NULL},
  56         {9, NULL, NULL},
  57         {10, NULL, NULL},
  58         {11, NULL, NULL},
  59         {12, NULL, NULL},
  60         {13, NULL, NULL},
  61         {14, NULL, NULL},
  62         {15, NULL, NULL},
  63         {16, NULL, NULL},
  64         {17, NULL, NULL},
  65         {18, NULL, NULL},
  66         {19, NULL, NULL},
  67         {20, NULL, NULL},
  68         {21, NULL, NULL},
  69         {22, NULL, NULL},
  70         {23, NULL, NULL},
  71         {24, NULL, NULL},
  72         {25, NULL, NULL},
  73         {26, NULL, NULL},
  74         {27, NULL, NULL},
  75         {28, NULL, NULL},
  76         {29, NULL, NULL},
  77         {30, NULL, NULL},
  78         {31, NULL, NULL},
  79
  80         {32, NULL, NULL},
  81         {33, NULL, NULL},
  82         {34, NULL, NULL},
  83         {35, NULL, NULL},
  84         {36, NULL, NULL},
  85         {37, NULL, NULL},
  86 };
  87
  88 /* number of mips dummy fp regs fp0 - fp31 + fsr and fir
  89  * we also add 18 unknown registers to handle gdb requests */
  90
  91 #define MIPS32NUMFPREGS 34 + 18
  92
  93 u8 mips32_gdb_dummy_fp_value[] = {0, 0, 0, 0};
  94
  95 reg_t mips32_gdb_dummy_fp_reg =
  96 {
  97         "GDB dummy floating-point register", mips32_gdb_dummy_fp_value, 0, 1, 32, NULL, 0, NULL, 0
  98 };
  99
 100 int mips32_core_reg_arch_type = -1;
 101
 102 int mips32_get_core_reg(reg_t *reg)
 103 {
 104         int retval;
 105         mips32_core_reg_t *mips32_reg = reg->arch_info;
 106         target_t *target = mips32_reg->target;
 107         mips32_common_t *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(reg_t *reg, u8 *buf)
 120 {
 121         mips32_core_reg_t *mips32_reg = reg->arch_info;
 122         target_t *target = mips32_reg->target;
 123         u32 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_s *target, int num)
 138 {
 139         u32 reg_value;
 140         mips32_core_reg_t *mips_core_reg;
 141
 142         /* get pointers to arch-specific information */
 143         mips32_common_t *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_s *target, int num)
 158 {
 159         u32 reg_value;
 160         mips32_core_reg_t *mips_core_reg;
 161
 162         /* get pointers to arch-specific information */
 163         mips32_common_t *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%x", 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_invalidate_core_regs(target_t *target)
 179 {
 180         /* get pointers to arch-specific information */
 181         mips32_common_t *mips32 = target->arch_info;
 182         int i;
 183
 184         for (i = 0; i < mips32->core_cache->num_regs; i++)
 185         {
 186                 mips32->core_cache->reg_list[i].valid = 0;
 187                 mips32->core_cache->reg_list[i].dirty = 0;
 188         }
 189
 190         return ERROR_OK;
 191 }
 192
 193 int mips32_get_gdb_reg_list(target_t *target, reg_t **reg_list[], int *reg_list_size)
 194 {
 195         /* get pointers to arch-specific information */
 196         mips32_common_t *mips32 = target->arch_info;
 197         int i;
 198
 199         /* include floating point registers */
 200         *reg_list_size = MIPS32NUMCOREREGS + MIPS32NUMFPREGS;
 201         *reg_list = malloc(sizeof(reg_t*) * (*reg_list_size));
 202
 203         for (i = 0; i < MIPS32NUMCOREREGS; i++)
 204         {
 205                 (*reg_list)[i] = &mips32->core_cache->reg_list[i];
 206         }
 207
 208         /* add dummy floating points regs */
 209         for (i = MIPS32NUMCOREREGS; i < (MIPS32NUMCOREREGS + MIPS32NUMFPREGS); i++)
 210         {
 211                 (*reg_list)[i] = &mips32_gdb_dummy_fp_reg;
 212         }
 213
 214         return ERROR_OK;
 215 }
 216
 217 int mips32_save_context(target_t *target)
 218 {
 219         int i;
 220
 221         /* get pointers to arch-specific information */
 222         mips32_common_t *mips32 = target->arch_info;
 223         mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
 224
 225         /* read core registers */
 226         mips32_pracc_read_regs(ejtag_info, mips32->core_regs);
 227
 228         for (i = 0; i < MIPS32NUMCOREREGS; i++)
 229         {
 230                 if (!mips32->core_cache->reg_list[i].valid)
 231                 {
 232                         mips32->read_core_reg(target, i);
 233                 }
 234         }
 235
 236         return ERROR_OK;
 237 }
 238
 239 int mips32_restore_context(target_t *target)
 240 {
 241         int i;
 242
 243         /* get pointers to arch-specific information */
 244         mips32_common_t *mips32 = target->arch_info;
 245         mips_ejtag_t *ejtag_info = &mips32->ejtag_info;
 246
 247         for (i = 0; i < MIPS32NUMCOREREGS; i++)
 248         {
 249                 if (mips32->core_cache->reg_list[i].dirty)
 250                 {
 251                         mips32->write_core_reg(target, i);
 252                 }
 253         }
 254
 255         /* write core regs */
 256         mips32_pracc_write_regs(ejtag_info, mips32->core_regs);
 257
 258         return ERROR_OK;
 259 }
 260
 261 int mips32_arch_state(struct target_s *target)
 262 {
 263         mips32_common_t *mips32 = target->arch_info;
 264
 265         if (mips32->common_magic != MIPS32_COMMON_MAGIC)
 266         {
 267                 LOG_ERROR("BUG: called for a non-MIPS32 target");
 268                 exit(-1);
 269         }
 270
 271         LOG_USER("target halted due to %s, pc: 0x%8.8x",
 272                 Jim_Nvp_value2name_simple( nvp_target_debug_reason, target->debug_reason )->name ,
 273                 buf_get_u32(mips32->core_cache->reg_list[MIPS32_PC].value, 0, 32));
 274
 275         return ERROR_OK;
 276 }
 277
 278 reg_cache_t *mips32_build_reg_cache(target_t *target)
 279 {
 280         /* get pointers to arch-specific information */
 281         mips32_common_t *mips32 = target->arch_info;
 282
 283         int num_regs = MIPS32NUMCOREREGS;
 284         reg_cache_t **cache_p = register_get_last_cache_p(&target->reg_cache);
 285         reg_cache_t *cache = malloc(sizeof(reg_cache_t));
 286         reg_t *reg_list = malloc(sizeof(reg_t) * num_regs);
 287         mips32_core_reg_t *arch_info = malloc(sizeof(mips32_core_reg_t) * num_regs);
 288         int i;
 289
 290         if (mips32_core_reg_arch_type == -1)
 291                 mips32_core_reg_arch_type = register_reg_arch_type(mips32_get_core_reg, mips32_set_core_reg);
 292
 293         register_init_dummy(&mips32_gdb_dummy_fp_reg);
 294
 295         /* Build the process context cache */
 296         cache->name = "mips32 registers";
 297         cache->next = NULL;
 298         cache->reg_list = reg_list;
 299         cache->num_regs = num_regs;
 300         (*cache_p) = cache;
 301         mips32->core_cache = cache;
 302
 303         for (i = 0; i < num_regs; i++)
 304         {
 305                 arch_info[i] = mips32_core_reg_list_arch_info[i];
 306                 arch_info[i].target = target;
 307                 arch_info[i].mips32_common = mips32;
 308                 reg_list[i].name = mips32_core_reg_list[i];
 309                 reg_list[i].size = 32;
 310                 reg_list[i].value = calloc(1, 4);
 311                 reg_list[i].dirty = 0;
 312                 reg_list[i].valid = 0;
 313                 reg_list[i].bitfield_desc = NULL;
 314                 reg_list[i].num_bitfields = 0;
 315                 reg_list[i].arch_type = mips32_core_reg_arch_type;
 316                 reg_list[i].arch_info = &arch_info[i];
 317         }
 318
 319         return cache;
 320 }
 321
 322 int mips32_init_arch_info(target_t *target, mips32_common_t *mips32, jtag_tap_t *tap)
 323 {
 324         target->arch_info = mips32;
 325         mips32->common_magic = MIPS32_COMMON_MAGIC;
 326
 327         /* has breakpoint/watchpint unit been scanned */
 328         mips32->bp_scanned = 0;
 329         mips32->data_break_list = NULL;
 330
 331         mips32->ejtag_info.tap = tap;
 332         mips32->read_core_reg = mips32_read_core_reg;
 333         mips32->write_core_reg = mips32_write_core_reg;
 334
 335         return ERROR_OK;
 336 }
 337
 338 int mips32_register_commands(struct command_context_s *cmd_ctx)
 339 {
 340         return ERROR_OK;
 341 }
 342
 343 int mips32_run_algorithm(struct target_s *target, int num_mem_params, mem_param_t *mem_params, int num_reg_params, reg_param_t *reg_params, u32 entry_point, u32 exit_point, int timeout_ms, void *arch_info)
 344 {
 345         /*TODO*/
 346         return ERROR_OK;
 347 }
 348
 349 int mips32_examine(struct target_s *target)
 350 {
 351         mips32_common_t *mips32 = target->arch_info;
 352
 353         if (!target->type->examined)
 354         {
 355                 target->type->examined = 1;
 356
 357                 /* we will configure later */
 358                 mips32->bp_scanned = 0;
 359                 mips32->num_inst_bpoints = 0;
 360                 mips32->num_data_bpoints = 0;
 361                 mips32->num_inst_bpoints_avail = 0;
 362                 mips32->num_data_bpoints_avail = 0;
 363         }
 364
 365         return ERROR_OK;
 366 }
 367
 368 int mips32_configure_break_unit(struct target_s *target)
 369 {
 370         /* get pointers to arch-specific information */
 371         mips32_common_t *mips32 = target->arch_info;
 372         int retval;
 373         u32 dcr, bpinfo;
 374         int i;
 375
 376         if (mips32->bp_scanned)
 377                 return ERROR_OK;
 378
 379         /* get info about breakpoint support */
 380         if ((retval = target_read_u32(target, EJTAG_DCR, &dcr)) != ERROR_OK)
 381                 return retval;
 382
 383         if (dcr & (1 << 16))
 384         {
 385                 /* get number of inst breakpoints */
 386                 if ((retval = target_read_u32(target, EJTAG_IBS, &bpinfo)) != ERROR_OK)
 387                         return retval;
 388
 389                 mips32->num_inst_bpoints = (bpinfo >> 24) & 0x0F;
 390                 mips32->num_inst_bpoints_avail = mips32->num_inst_bpoints;
 391                 mips32->inst_break_list = calloc(mips32->num_inst_bpoints, sizeof(mips32_comparator_t));
 392                 for (i = 0; i < mips32->num_inst_bpoints; i++)
 393                 {
 394                         mips32->inst_break_list[i].reg_address = EJTAG_IBA1 + (0x100 * i);
 395                 }
 396
 397                 /* clear IBIS reg */
 398                 if ((retval = target_write_u32(target, EJTAG_IBS, 0)) != ERROR_OK)
 399                         return retval;
 400         }
 401
 402         if (dcr & (1 << 17))
 403         {
 404                 /* get number of data breakpoints */
 405                 if ((retval = target_read_u32(target, EJTAG_DBS, &bpinfo)) != ERROR_OK)
 406                         return retval;
 407
 408                 mips32->num_data_bpoints = (bpinfo >> 24) & 0x0F;
 409                 mips32->num_data_bpoints_avail = mips32->num_data_bpoints;
 410                 mips32->data_break_list = calloc(mips32->num_data_bpoints, sizeof(mips32_comparator_t));
 411                 for (i = 0; i < mips32->num_data_bpoints; i++)
 412                 {
 413                         mips32->data_break_list[i].reg_address = EJTAG_DBA1 + (0x100 * i);
 414                 }
 415
 416                 /* clear DBIS reg */
 417                 if ((retval = target_write_u32(target, EJTAG_DBS, 0)) != ERROR_OK)
 418                         return retval;
 419         }
 420
 421         LOG_DEBUG("DCR 0x%x numinst %i numdata %i", dcr, mips32->num_inst_bpoints, mips32->num_data_bpoints);
 422
 423         mips32->bp_scanned = 1;
 424
 425         return ERROR_OK;
 426 }