gdb/score-tdep.c

   1 /* Target-dependent code for the S+core architecture, for GDB,
   2    the GNU Debugger.
   3
   4    Copyright (C) 2006-2019 Free Software Foundation, Inc.
   5
   6    Contributed by Qinwei (qinwei@sunnorth.com.cn)
   7    Contributed by Ching-Peng Lin (cplin@sunplus.com)
   8
   9    This file is part of GDB.
  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 3 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 #include "defs.h"
  25 #include "inferior.h"
  26 #include "symtab.h"
  27 #include "objfiles.h"
  28 #include "gdbcore.h"
  29 #include "target.h"
  30 #include "arch-utils.h"
  31 #include "regcache.h"
  32 #include "regset.h"
  33 #include "dis-asm.h"
  34 #include "frame-unwind.h"
  35 #include "frame-base.h"
  36 #include "trad-frame.h"
  37 #include "dwarf2-frame.h"
  38 #include "score-tdep.h"
  39
  40 #define G_FLD(_i,_ms,_ls) \
  41     ((unsigned)((_i) << (31 - (_ms))) >> (31 - (_ms) + (_ls)))
  42
  43 typedef struct{
  44   unsigned long long v;
  45   unsigned long long raw;
  46   unsigned int len;
  47 }inst_t;
  48
  49 struct score_frame_cache
  50 {
  51   CORE_ADDR base;
  52   CORE_ADDR fp;
  53   struct trad_frame_saved_reg *saved_regs;
  54 };
  55
  56 static int target_mach = bfd_mach_score7;
  57
  58 static struct type *
  59 score_register_type (struct gdbarch *gdbarch, int regnum)
  60 {
  61   gdb_assert (regnum >= 0
  62               && regnum < ((target_mach == bfd_mach_score7)
  63                            ? SCORE7_NUM_REGS : SCORE3_NUM_REGS));
  64   return builtin_type (gdbarch)->builtin_uint32;
  65 }
  66
  67 static const char *
  68 score7_register_name (struct gdbarch *gdbarch, int regnum)
  69 {
  70   const char *score_register_names[] = {
  71     "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
  72     "r8",  "r9",  "r10", "r11", "r12", "r13", "r14", "r15",
  73     "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
  74     "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
  75
  76     "PSR",     "COND",  "ECR",     "EXCPVEC", "CCR",
  77     "EPC",     "EMA",   "TLBLOCK", "TLBPT",   "PEADDR",
  78     "TLBRPT",  "PEVN",  "PECTX",   "LIMPFN",  "LDMPFN",
  79     "PREV",    "DREG",  "PC",      "DSAVE",   "COUNTER",
  80     "LDCR",    "STCR",  "CEH",     "CEL",
  81   };
  82
  83   gdb_assert (regnum >= 0 && regnum < SCORE7_NUM_REGS);
  84   return score_register_names[regnum];
  85 }
  86
  87 static const char *
  88 score3_register_name (struct gdbarch *gdbarch, int regnum)
  89 {
  90   const char *score_register_names[] = {
  91     "r0",  "r1",  "r2",  "r3",  "r4",  "r5",  "r6",  "r7",
  92     "r8",  "r9",  "r10", "r11", "r12", "r13", "r14", "r15",
  93     "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23",
  94     "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31",
  95
  96     "PSR",      "COND",   "ECR",   "EXCPVEC",  "CCR",
  97     "EPC",      "EMA",    "PREV",  "DREG",     "DSAVE",
  98     "COUNTER",  "LDCR",   "STCR",  "CEH",      "CEL",
  99     "",         "",       "PC",
 100   };
 101
 102   gdb_assert (regnum >= 0 && regnum < SCORE3_NUM_REGS);
 103   return score_register_names[regnum];
 104 }
 105
 106 #if WITH_SIM
 107 static int
 108 score_register_sim_regno (struct gdbarch *gdbarch, int regnum)
 109 {
 110   gdb_assert (regnum >= 0
 111               && regnum < ((target_mach == bfd_mach_score7)
 112                            ? SCORE7_NUM_REGS : SCORE3_NUM_REGS));
 113   return regnum;
 114 }
 115 #endif
 116
 117 static inst_t *
 118 score7_fetch_inst (struct gdbarch *gdbarch, CORE_ADDR addr, gdb_byte *memblock)
 119 {
 120   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 121   static inst_t inst = { 0, 0, 0 };
 122   gdb_byte buf[SCORE_INSTLEN] = { 0 };
 123   int big;
 124   int ret;
 125
 126   if (target_has_execution && memblock != NULL)
 127     {
 128       /* Fetch instruction from local MEMBLOCK.  */
 129       memcpy (buf, memblock, SCORE_INSTLEN);
 130     }
 131   else
 132     {
 133       /* Fetch instruction from target.  */
 134       ret = target_read_memory (addr & ~0x3, buf, SCORE_INSTLEN);
 135       if (ret)
 136         {
 137           error (_("Error: target_read_memory in file:%s, line:%d!"),
 138                   __FILE__, __LINE__);
 139           return 0;
 140         }
 141     }
 142
 143   inst.raw = extract_unsigned_integer (buf, SCORE_INSTLEN, byte_order);
 144   inst.len = (inst.raw & 0x80008000) ? 4 : 2;
 145   inst.v = ((inst.raw >> 16 & 0x7FFF) << 15) | (inst.raw & 0x7FFF);
 146   big = (byte_order == BFD_ENDIAN_BIG);
 147   if (inst.len == 2)
 148     {
 149       if (big ^ ((addr & 0x2) == 2))
 150         inst.v = G_FLD (inst.v, 29, 15);
 151       else
 152         inst.v = G_FLD (inst.v, 14, 0);
 153     }
 154   return &inst;
 155 }
 156
 157 static inst_t *
 158 score3_adjust_pc_and_fetch_inst (CORE_ADDR *pcptr, int *lenptr,
 159                                  enum bfd_endian byte_order)
 160 {
 161   static inst_t inst = { 0, 0, 0 };
 162
 163   struct breakplace
 164   {
 165     int break_offset;
 166     int inst_len;
 167   };
 168   /*     raw        table 1 (column 2, 3, 4)
 169     *  0  1  0  *   # 2
 170     *  0  1  1  0   # 3
 171     0  1  1  0  *   # 6
 172                     table 2 (column 1, 2, 3)
 173     *  0  0  *  *   # 0, 4
 174     0  1  0  *  *   # 2
 175     1  1  0  *  *   # 6
 176    */
 177
 178   static const struct breakplace bk_table[16] =
 179     {
 180       /* table 1 */
 181       {0, 0},
 182       {0, 0},
 183       {0, 4},
 184       {0, 6},
 185       {0, 0},
 186       {0, 0},
 187       {-2, 6},
 188       {0, 0},
 189       /* table 2 */
 190       {0, 2},
 191       {0, 0},
 192       {-2, 4},
 193       {0, 0},
 194       {0, 2},
 195       {0, 0},
 196       {-4, 6},
 197       {0, 0}
 198     };
 199
 200 #define EXTRACT_LEN 2
 201   CORE_ADDR adjust_pc = *pcptr & ~0x1;
 202   gdb_byte buf[5][EXTRACT_LEN] =
 203     {
 204       {'\0', '\0'},
 205       {'\0', '\0'},
 206       {'\0', '\0'},
 207       {'\0', '\0'},
 208       {'\0', '\0'}
 209     };
 210   int ret;
 211   unsigned int raw;
 212   unsigned int cbits = 0;
 213   int bk_index;
 214   int i, count;
 215
 216   inst.v = 0;
 217   inst.raw = 0;
 218   inst.len = 0;
 219
 220   adjust_pc -= 4;
 221   for (i = 0; i < 5; i++)
 222     {
 223       ret = target_read_memory (adjust_pc + 2 * i, buf[i], EXTRACT_LEN);
 224       if (ret != 0)
 225         {
 226           buf[i][0] = '\0';
 227           buf[i][1] = '\0';
 228           if (i == 2)
 229             error (_("Error: target_read_memory in file:%s, line:%d!"),
 230                    __FILE__, __LINE__);
 231         }
 232
 233       raw = extract_unsigned_integer (buf[i], EXTRACT_LEN, byte_order);
 234       cbits = (cbits << 1) | (raw >> 15);
 235     }
 236   adjust_pc += 4;
 237
 238   if (cbits & 0x4)
 239     {
 240       /* table 1 */
 241       cbits = (cbits >> 1) & 0x7;
 242       bk_index = cbits;
 243     }
 244   else
 245     {
 246       /* table 2 */
 247       cbits = (cbits >> 2) & 0x7;
 248       bk_index = cbits + 8;
 249     }
 250
 251   gdb_assert (!((bk_table[bk_index].break_offset == 0)
 252                 && (bk_table[bk_index].inst_len == 0)));
 253
 254   inst.len = bk_table[bk_index].inst_len;
 255
 256   i = (bk_table[bk_index].break_offset + 4) / 2;
 257   count = inst.len / 2;
 258   for (; count > 0; i++, count--)
 259     {
 260       inst.raw = (inst.raw << 16)
 261                  | extract_unsigned_integer (buf[i], EXTRACT_LEN, byte_order);
 262     }
 263
 264   switch (inst.len)
 265     {
 266     case 2:
 267       inst.v = inst.raw & 0x7FFF;
 268       break;
 269     case 4:
 270       inst.v = ((inst.raw >> 16 & 0x7FFF) << 15) | (inst.raw & 0x7FFF);
 271       break;
 272     case 6:
 273       inst.v = ((inst.raw >> 32 & 0x7FFF) << 30)
 274                | ((inst.raw >> 16 & 0x7FFF) << 15) | (inst.raw & 0x7FFF);
 275       break;
 276     }
 277
 278   if (pcptr)
 279     *pcptr = adjust_pc + bk_table[bk_index].break_offset;
 280   if (lenptr)
 281     *lenptr = bk_table[bk_index].inst_len;
 282
 283 #undef EXTRACT_LEN
 284
 285   return &inst;
 286 }
 287
 288 /* Implement the breakpoint_kind_from_pc gdbarch method.  */
 289
 290 static int
 291 score7_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr)
 292 {
 293   int ret;
 294   unsigned int raw;
 295   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 296   gdb_byte buf[SCORE_INSTLEN] = { 0 };
 297
 298   if ((ret = target_read_memory (*pcptr & ~0x3, buf, SCORE_INSTLEN)) != 0)
 299     {
 300       error (_("Error: target_read_memory in file:%s, line:%d!"),
 301              __FILE__, __LINE__);
 302     }
 303   raw = extract_unsigned_integer (buf, SCORE_INSTLEN, byte_order);
 304
 305   if (!(raw & 0x80008000))
 306     {
 307       /* 16bits instruction.  */
 308       *pcptr &= ~0x1;
 309       return 2;
 310     }
 311   else
 312     {
 313       /* 32bits instruction.  */
 314       *pcptr &= ~0x3;
 315       return 4;
 316     }
 317 }
 318
 319 /* Implement the sw_breakpoint_from_kind gdbarch method.  */
 320
 321 static const gdb_byte *
 322 score7_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size)
 323 {
 324   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 325
 326   *size = kind;
 327
 328   if (kind == 4)
 329     {
 330       static gdb_byte big_breakpoint32[] = { 0x80, 0x00, 0x80, 0x06 };
 331       static gdb_byte little_breakpoint32[] = { 0x06, 0x80, 0x00, 0x80 };
 332
 333       if (byte_order == BFD_ENDIAN_BIG)
 334         return big_breakpoint32;
 335       else
 336         return little_breakpoint32;
 337     }
 338   else
 339     {
 340       static gdb_byte big_breakpoint16[] = { 0x60, 0x02 };
 341       static gdb_byte little_breakpoint16[] = { 0x02, 0x60 };
 342
 343       if (byte_order == BFD_ENDIAN_BIG)
 344         return big_breakpoint16;
 345       else
 346         return little_breakpoint16;
 347     }
 348 }
 349
 350 /* Implement the breakpoint_kind_from_pc gdbarch method.  */
 351
 352 static int
 353 score3_breakpoint_kind_from_pc (struct gdbarch *gdbarch, CORE_ADDR *pcptr)
 354 {
 355   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 356   int len;
 357
 358   score3_adjust_pc_and_fetch_inst (pcptr, &len, byte_order);
 359
 360   return len;
 361 }
 362
 363 /* Implement the sw_breakpoint_from_kind gdbarch method.  */
 364
 365 static const gdb_byte *
 366 score3_sw_breakpoint_from_kind (struct gdbarch *gdbarch, int kind, int *size)
 367 {
 368   int index = 0;
 369   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 370   static gdb_byte score_break_insns[6][6] = {
 371     /* The following three instructions are big endian.  */
 372     { 0x00, 0x20 },
 373     { 0x80, 0x00, 0x00, 0x06 },
 374     { 0x80, 0x00, 0x80, 0x00, 0x00, 0x00 },
 375     /* The following three instructions are little endian.  */
 376     { 0x20, 0x00 },
 377     { 0x00, 0x80, 0x06, 0x00 },
 378     { 0x00, 0x80, 0x00, 0x80, 0x00, 0x00 }};
 379
 380   *size = kind;
 381
 382   index = ((byte_order == BFD_ENDIAN_BIG) ? 0 : 3) + (kind / 2 - 1);
 383   return score_break_insns[index];
 384 }
 385
 386 static CORE_ADDR
 387 score_adjust_breakpoint_address (struct gdbarch *gdbarch, CORE_ADDR bpaddr)
 388 {
 389   CORE_ADDR adjust_pc = bpaddr;
 390
 391   if (target_mach == bfd_mach_score3)
 392     score3_adjust_pc_and_fetch_inst (&adjust_pc, NULL,
 393                                      gdbarch_byte_order (gdbarch));
 394   else
 395     adjust_pc = align_down (adjust_pc, 2);
 396
 397   return adjust_pc;
 398 }
 399
 400 static CORE_ADDR
 401 score_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr)
 402 {
 403   return align_down (addr, 16);
 404 }
 405
 406 static void
 407 score_xfer_register (struct regcache *regcache, int regnum, int length,
 408                      enum bfd_endian endian, gdb_byte *readbuf,
 409                      const gdb_byte *writebuf, int buf_offset)
 410 {
 411   int reg_offset = 0;
 412   gdb_assert (regnum >= 0
 413               && regnum < ((target_mach == bfd_mach_score7)
 414                            ? SCORE7_NUM_REGS : SCORE3_NUM_REGS));
 415
 416   switch (endian)
 417     {
 418     case BFD_ENDIAN_BIG:
 419       reg_offset = SCORE_REGSIZE - length;
 420       break;
 421     case BFD_ENDIAN_LITTLE:
 422       reg_offset = 0;
 423       break;
 424     case BFD_ENDIAN_UNKNOWN:
 425       reg_offset = 0;
 426       break;
 427     default:
 428       error (_("Error: score_xfer_register in file:%s, line:%d!"),
 429              __FILE__, __LINE__);
 430     }
 431
 432   if (readbuf != NULL)
 433     regcache->cooked_read_part (regnum, reg_offset, length,
 434                                 readbuf + buf_offset);
 435   if (writebuf != NULL)
 436     regcache->cooked_write_part (regnum, reg_offset, length,
 437                                  writebuf + buf_offset);
 438 }
 439
 440 static enum return_value_convention
 441 score_return_value (struct gdbarch *gdbarch, struct value *function,
 442                     struct type *type, struct regcache *regcache,
 443                     gdb_byte * readbuf, const gdb_byte * writebuf)
 444 {
 445   if (TYPE_CODE (type) == TYPE_CODE_STRUCT
 446       || TYPE_CODE (type) == TYPE_CODE_UNION
 447       || TYPE_CODE (type) == TYPE_CODE_ARRAY)
 448     return RETURN_VALUE_STRUCT_CONVENTION;
 449   else
 450     {
 451       int offset;
 452       int regnum;
 453       for (offset = 0, regnum = SCORE_A0_REGNUM;
 454            offset < TYPE_LENGTH (type);
 455            offset += SCORE_REGSIZE, regnum++)
 456         {
 457           int xfer = SCORE_REGSIZE;
 458
 459           if (offset + xfer > TYPE_LENGTH (type))
 460             xfer = TYPE_LENGTH (type) - offset;
 461           score_xfer_register (regcache, regnum, xfer,
 462                                gdbarch_byte_order(gdbarch),
 463                                readbuf, writebuf, offset);
 464         }
 465       return RETURN_VALUE_REGISTER_CONVENTION;
 466     }
 467 }
 468
 469 static int
 470 score_type_needs_double_align (struct type *type)
 471 {
 472   enum type_code typecode = TYPE_CODE (type);
 473
 474   if ((typecode == TYPE_CODE_INT && TYPE_LENGTH (type) == 8)
 475       || (typecode == TYPE_CODE_FLT && TYPE_LENGTH (type) == 8))
 476     return 1;
 477   else if (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION)
 478     {
 479       int i, n;
 480
 481       n = TYPE_NFIELDS (type);
 482       for (i = 0; i < n; i++)
 483         if (score_type_needs_double_align (TYPE_FIELD_TYPE (type, i)))
 484           return 1;
 485       return 0;
 486     }
 487   return 0;
 488 }
 489
 490 static CORE_ADDR
 491 score_push_dummy_call (struct gdbarch *gdbarch, struct value *function,
 492                        struct regcache *regcache, CORE_ADDR bp_addr,
 493                        int nargs, struct value **args, CORE_ADDR sp,
 494                        function_call_return_method return_method,
 495                        CORE_ADDR struct_addr)
 496 {
 497   enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
 498   int argnum;
 499   int argreg;
 500   int arglen = 0;
 501   CORE_ADDR stack_offset = 0;
 502   CORE_ADDR addr = 0;
 503
 504   /* Step 1, Save RA.  */
 505   regcache_cooked_write_unsigned (regcache, SCORE_RA_REGNUM, bp_addr);
 506
 507   /* Step 2, Make space on the stack for the args.  */
 508   struct_addr = align_down (struct_addr, 16);
 509   sp = align_down (sp, 16);
 510   for (argnum = 0; argnum < nargs; argnum++)
 511     arglen += align_up (TYPE_LENGTH (value_type (args[argnum])),
 512                         SCORE_REGSIZE);
 513   sp -= align_up (arglen, 16);
 514
 515   argreg = SCORE_BEGIN_ARG_REGNUM;
 516
 517   /* Step 3, Check if struct return then save the struct address to
 518      r4 and increase the stack_offset by 4.  */
 519   if (return_method == return_method_struct)
 520     {
 521       regcache_cooked_write_unsigned (regcache, argreg++, struct_addr);
 522       stack_offset += SCORE_REGSIZE;
 523     }
 524
 525   /* Step 4, Load arguments:
 526      If arg length is too long (> 4 bytes), then split the arg and
 527      save every parts.  */
 528   for (argnum = 0; argnum < nargs; argnum++)
 529     {
 530       struct value *arg = args[argnum];
 531       struct type *arg_type = check_typedef (value_type (arg));
 532       enum type_code typecode = TYPE_CODE (arg_type);
 533       const gdb_byte *val = value_contents (arg);
 534       int downward_offset = 0;
 535       int arg_last_part_p = 0;
 536
 537       arglen = TYPE_LENGTH (arg_type);
 538
 539       /* If a arg should be aligned to 8 bytes (long long or double),
 540          the value should be put to even register numbers.  */
 541       if (score_type_needs_double_align (arg_type))
 542         {
 543           if (argreg & 1)
 544             argreg++;
 545         }
 546
 547       /* If sizeof a block < SCORE_REGSIZE, then Score GCC will chose
 548          the default "downward"/"upward" method:
 549
 550          Example:
 551
 552          struct struc
 553          {
 554            char a; char b; char c;
 555          } s = {'a', 'b', 'c'};
 556
 557          Big endian:    s = {X, 'a', 'b', 'c'}
 558          Little endian: s = {'a', 'b', 'c', X}
 559
 560          Where X is a hole.  */
 561
 562       if (gdbarch_byte_order(gdbarch) == BFD_ENDIAN_BIG
 563           && (typecode == TYPE_CODE_STRUCT
 564               || typecode == TYPE_CODE_UNION)
 565           && argreg > SCORE_LAST_ARG_REGNUM
 566           && arglen < SCORE_REGSIZE)
 567         downward_offset += (SCORE_REGSIZE - arglen);
 568
 569       while (arglen > 0)
 570         {
 571           int partial_len = arglen < SCORE_REGSIZE ? arglen : SCORE_REGSIZE;
 572           ULONGEST regval = extract_unsigned_integer (val, partial_len,
 573                                                       byte_order);
 574
 575           /* The last part of a arg should shift left when
 576              gdbarch_byte_order is BFD_ENDIAN_BIG.  */
 577           if (byte_order == BFD_ENDIAN_BIG
 578               && arg_last_part_p == 1
 579               && (typecode == TYPE_CODE_STRUCT
 580                   || typecode == TYPE_CODE_UNION))
 581             regval <<= ((SCORE_REGSIZE - partial_len) * TARGET_CHAR_BIT);
 582
 583           /* Always increase the stack_offset and save args to stack.  */
 584           addr = sp + stack_offset + downward_offset;
 585           write_memory (addr, val, partial_len);
 586
 587           if (argreg <= SCORE_LAST_ARG_REGNUM)
 588             {
 589               regcache_cooked_write_unsigned (regcache, argreg++, regval);
 590               if (arglen > SCORE_REGSIZE && arglen < SCORE_REGSIZE * 2)
 591                 arg_last_part_p = 1;
 592             }
 593
 594           val += partial_len;
 595           arglen -= partial_len;
 596           stack_offset += align_up (partial_len, SCORE_REGSIZE);
 597         }
 598     }
 599
 600   /* Step 5, Save SP.  */
 601   regcache_cooked_write_unsigned (regcache, SCORE_SP_REGNUM, sp);
 602
 603   return sp;
 604 }
 605
 606 static CORE_ADDR
 607 score7_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
 608 {
 609   CORE_ADDR cpc = pc;
 610   int iscan = 32, stack_sub = 0;
 611   while (iscan-- > 0)
 612     {
 613       inst_t *inst = score7_fetch_inst (gdbarch, cpc, NULL);
 614       if (!inst)
 615         break;
 616       if ((inst->len == 4) && !stack_sub
 617           && (G_FLD (inst->v, 29, 25) == 0x1
 618               && G_FLD (inst->v, 24, 20) == 0x0))
 619         {
 620           /* addi r0, offset */
 621           stack_sub = cpc + SCORE_INSTLEN;
 622           pc = cpc + SCORE_INSTLEN;
 623         }
 624       else if ((inst->len == 4)
 625                && (G_FLD (inst->v, 29, 25) == 0x0)
 626                && (G_FLD (inst->v, 24, 20) == 0x2)
 627                && (G_FLD (inst->v, 19, 15) == 0x0)
 628                && (G_FLD (inst->v, 14, 10) == 0xF)
 629                && (G_FLD (inst->v, 9, 0) == 0x56))
 630         {
 631           /* mv r2, r0  */
 632           pc = cpc + SCORE_INSTLEN;
 633           break;
 634         }
 635       else if ((inst->len == 2)
 636                && (G_FLD (inst->v, 14, 12) == 0x0)
 637                && (G_FLD (inst->v, 11, 8) == 0x2)
 638                && (G_FLD (inst->v, 7, 4) == 0x0)
 639                && (G_FLD (inst->v, 3, 0) == 0x3))
 640         {
 641           /* mv! r2, r0 */
 642           pc = cpc + SCORE16_INSTLEN;
 643           break;
 644         }
 645       else if ((inst->len == 2)
 646                && ((G_FLD (inst->v, 14, 12) == 3)    /* j15 form */
 647                    || (G_FLD (inst->v, 14, 12) == 4) /* b15 form */
 648                    || (G_FLD (inst->v, 14, 12) == 0x0
 649                        && G_FLD (inst->v, 3, 0) == 0x4))) /* br! */
 650         break;
 651       else if ((inst->len == 4)
 652                && ((G_FLD (inst->v, 29, 25) == 2)    /* j32 form */
 653                    || (G_FLD (inst->v, 29, 25) == 4) /* b32 form */
 654                    || (G_FLD (inst->v, 29, 25) == 0x0
 655                        && G_FLD (inst->v, 6, 1) == 0x4)))  /* br */
 656         break;
 657
 658       cpc += (inst->len == 2) ? SCORE16_INSTLEN : SCORE_INSTLEN;
 659     }
 660   return pc;
 661 }
 662
 663 static CORE_ADDR
 664 score3_skip_prologue (struct gdbarch *gdbarch, CORE_ADDR pc)
 665 {
 666   CORE_ADDR cpc = pc;
 667   int iscan = 32, stack_sub = 0;
 668   while (iscan-- > 0)
 669     {
 670       inst_t *inst
 671         = score3_adjust_pc_and_fetch_inst (&cpc, NULL,
 672                                            gdbarch_byte_order (gdbarch));
 673
 674       if (!inst)
 675         break;
 676       if (inst->len == 4 && !stack_sub
 677           && (G_FLD (inst->v, 29, 25) == 0x1)
 678           && (G_FLD (inst->v, 19, 17) == 0x0)
 679           && (G_FLD (inst->v, 24, 20) == 0x0))
 680         {
 681           /* addi r0, offset */
 682           stack_sub = cpc + inst->len;
 683           pc = cpc + inst->len;
 684         }
 685       else if (inst->len == 4
 686                && (G_FLD (inst->v, 29, 25) == 0x0)
 687                && (G_FLD (inst->v, 24, 20) == 0x2)
 688                && (G_FLD (inst->v, 19, 15) == 0x0)
 689                && (G_FLD (inst->v, 14, 10) == 0xF)
 690                && (G_FLD (inst->v, 9, 0) == 0x56))
 691         {
 692           /* mv r2, r0  */
 693           pc = cpc + inst->len;
 694           break;
 695         }
 696       else if ((inst->len == 2)
 697                && (G_FLD (inst->v, 14, 10) == 0x10)
 698                && (G_FLD (inst->v, 9, 5) == 0x2)
 699                && (G_FLD (inst->v, 4, 0) == 0x0))
 700         {
 701           /* mv! r2, r0 */
 702           pc = cpc + inst->len;
 703           break;
 704         }
 705       else if (inst->len == 2
 706                && ((G_FLD (inst->v, 14, 12) == 3) /* b15 form */
 707                    || (G_FLD (inst->v, 14, 12) == 0x0
 708                        && G_FLD (inst->v, 11, 5) == 0x4))) /* br! */
 709         break;
 710       else if (inst->len == 4
 711                && ((G_FLD (inst->v, 29, 25) == 2)    /* j32 form */
 712                    || (G_FLD (inst->v, 29, 25) == 4))) /* b32 form */
 713         break;
 714
 715       cpc += inst->len;
 716     }
 717   return pc;
 718 }
 719
 720 /* Implement the stack_frame_destroyed_p gdbarch method. */
 721
 722 static int
 723 score7_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR cur_pc)
 724 {
 725   inst_t *inst = score7_fetch_inst (gdbarch, cur_pc, NULL);
 726
 727   if (inst->v == 0x23)
 728     return 1;   /* mv! r0, r2 */
 729   else if (G_FLD (inst->v, 14, 12) == 0x2
 730            && G_FLD (inst->v, 3, 0) == 0xa)
 731     return 1;   /* pop! */
 732   else if (G_FLD (inst->v, 14, 12) == 0x0
 733            && G_FLD (inst->v, 7, 0) == 0x34)
 734     return 1;   /* br! r3 */
 735   else if (G_FLD (inst->v, 29, 15) == 0x2
 736            && G_FLD (inst->v, 6, 1) == 0x2b)
 737     return 1;   /* mv r0, r2 */
 738   else if (G_FLD (inst->v, 29, 25) == 0x0
 739            && G_FLD (inst->v, 6, 1) == 0x4
 740            && G_FLD (inst->v, 19, 15) == 0x3)
 741     return 1;   /* br r3 */
 742   else
 743     return 0;
 744 }
 745
 746 /* Implement the stack_frame_destroyed_p gdbarch method. */
 747
 748 static int
 749 score3_stack_frame_destroyed_p (struct gdbarch *gdbarch, CORE_ADDR cur_pc)
 750 {
 751   CORE_ADDR pc = cur_pc;
 752   inst_t *inst
 753     = score3_adjust_pc_and_fetch_inst (&pc, NULL,
 754                                        gdbarch_byte_order (gdbarch));
 755
 756   if (inst->len == 2
 757       && (G_FLD (inst->v, 14, 10) == 0x10)
 758       && (G_FLD (inst->v, 9, 5) == 0x0)
 759       && (G_FLD (inst->v, 4, 0) == 0x2))
 760     return 1;   /* mv! r0, r2 */
 761   else if (inst->len == 4
 762            && (G_FLD (inst->v, 29, 25) == 0x0)
 763            && (G_FLD (inst->v, 24, 20) == 0x2)
 764            && (G_FLD (inst->v, 19, 15) == 0x0)
 765            && (G_FLD (inst->v, 14, 10) == 0xF)
 766            && (G_FLD (inst->v, 9, 0) == 0x56))
 767     return 1;   /* mv r0, r2 */
 768   else if (inst->len == 2
 769            && (G_FLD (inst->v, 14, 12) == 0x0)
 770            && (G_FLD (inst->v, 11, 5) == 0x2))
 771     return 1;   /* pop! */
 772   else if (inst->len == 2
 773            && (G_FLD (inst->v, 14, 12) == 0x0)
 774            && (G_FLD (inst->v, 11, 7) == 0x0)
 775            && (G_FLD (inst->v, 6, 5) == 0x2))
 776     return 1;   /* rpop! */
 777   else if (inst->len == 2
 778            && (G_FLD (inst->v, 14, 12) == 0x0)
 779            && (G_FLD (inst->v, 11, 5) == 0x4)
 780            && (G_FLD (inst->v, 4, 0) == 0x3))
 781     return 1;   /* br! r3 */
 782   else if (inst->len == 4
 783            && (G_FLD (inst->v, 29, 25) == 0x0)
 784            && (G_FLD (inst->v, 24, 20) == 0x0)
 785            && (G_FLD (inst->v, 19, 15) == 0x3)
 786            && (G_FLD (inst->v, 14, 10) == 0xF)
 787            && (G_FLD (inst->v, 9, 0) == 0x8))
 788     return 1;   /* br r3 */
 789   else
 790     return 0;
 791 }
 792
 793 static gdb_byte *
 794 score7_malloc_and_get_memblock (CORE_ADDR addr, CORE_ADDR size)
 795 {
 796   int ret;
 797   gdb_byte *memblock = NULL;
 798
 799   if (size == 0)
 800     return NULL;
 801
 802   memblock = (gdb_byte *) xmalloc (size);
 803   memset (memblock, 0, size);
 804   ret = target_read_memory (addr & ~0x3, memblock, size);
 805   if (ret)
 806     {
 807       error (_("Error: target_read_memory in file:%s, line:%d!"),
 808              __FILE__, __LINE__);
 809       return NULL;
 810     }
 811   return memblock;
 812 }
 813
 814 static void
 815 score7_free_memblock (gdb_byte *memblock)
 816 {
 817   xfree (memblock);
 818 }
 819
 820 static void
 821 score7_adjust_memblock_ptr (gdb_byte **memblock, CORE_ADDR prev_pc,
 822                            CORE_ADDR cur_pc)
 823 {
 824   if (prev_pc == -1)
 825     {
 826       /* First time call this function, do nothing.  */
 827     }
 828   else if (cur_pc - prev_pc == 2 && (cur_pc & 0x3) == 0)
 829     {
 830       /* First 16-bit instruction, then 32-bit instruction.  */
 831       *memblock += SCORE_INSTLEN;
 832     }
 833   else if (cur_pc - prev_pc == 4)
 834     {
 835       /* Is 32-bit instruction, increase MEMBLOCK by 4.  */
 836       *memblock += SCORE_INSTLEN;
 837     }
 838 }
 839
 840 static void
 841 score7_analyze_prologue (CORE_ADDR startaddr, CORE_ADDR pc,
 842                         struct frame_info *this_frame,
 843                         struct score_frame_cache *this_cache)
 844 {
 845   struct gdbarch *gdbarch = get_frame_arch (this_frame);
 846   CORE_ADDR sp;
 847   CORE_ADDR fp;
 848   CORE_ADDR cur_pc = startaddr;
 849
 850   int sp_offset = 0;
 851   int ra_offset = 0;
 852   int fp_offset = 0;
 853   int ra_offset_p = 0;
 854   int fp_offset_p = 0;
 855   int inst_len = 0;
 856
 857   gdb_byte *memblock = NULL;
 858   gdb_byte *memblock_ptr = NULL;
 859   CORE_ADDR prev_pc = -1;
 860
 861   /* Allocate MEMBLOCK if PC - STARTADDR > 0.  */
 862   memblock_ptr = memblock =
 863     score7_malloc_and_get_memblock (startaddr, pc - startaddr);
 864
 865   sp = get_frame_register_unsigned (this_frame, SCORE_SP_REGNUM);
 866   fp = get_frame_register_unsigned (this_frame, SCORE_FP_REGNUM);
 867
 868   for (; cur_pc < pc; prev_pc = cur_pc, cur_pc += inst_len)
 869     {
 870       inst_t *inst = NULL;
 871       if (memblock != NULL)
 872         {
 873           /* Reading memory block from target succefully and got all
 874              the instructions(from STARTADDR to PC) needed.  */
 875           score7_adjust_memblock_ptr (&memblock, prev_pc, cur_pc);
 876           inst = score7_fetch_inst (gdbarch, cur_pc, memblock);
 877         }
 878       else
 879         {
 880           /* Otherwise, we fetch 4 bytes from target, and GDB also
 881              work correctly.  */
 882           inst = score7_fetch_inst (gdbarch, cur_pc, NULL);
 883         }
 884
 885       /* FIXME: make a full-power prologue analyzer.  */
 886       if (inst->len == 2)
 887         {
 888           inst_len = SCORE16_INSTLEN;
 889
 890           if (G_FLD (inst->v, 14, 12) == 0x2
 891               && G_FLD (inst->v, 3, 0) == 0xe)
 892             {
 893               /* push! */
 894               sp_offset += 4;
 895
 896               if (G_FLD (inst->v, 11, 7) == 0x6
 897                   && ra_offset_p == 0)
 898                 {
 899                   /* push! r3, [r0] */
 900                   ra_offset = sp_offset;
 901                   ra_offset_p = 1;
 902                 }
 903               else if (G_FLD (inst->v, 11, 7) == 0x4
 904                        && fp_offset_p == 0)
 905                 {
 906                   /* push! r2, [r0] */
 907                   fp_offset = sp_offset;
 908                   fp_offset_p = 1;
 909                 }
 910             }
 911           else if (G_FLD (inst->v, 14, 12) == 0x2
 912                    && G_FLD (inst->v, 3, 0) == 0xa)
 913             {
 914               /* pop! */
 915               sp_offset -= 4;
 916             }
 917           else if (G_FLD (inst->v, 14, 7) == 0xc1
 918                    && G_FLD (inst->v, 2, 0) == 0x0)
 919             {
 920               /* subei! r0, n */
 921               sp_offset += (int) pow (2, G_FLD (inst->v, 6, 3));
 922             }
 923           else if (G_FLD (inst->v, 14, 7) == 0xc0
 924                    && G_FLD (inst->v, 2, 0) == 0x0)
 925             {
 926               /* addei! r0, n */
 927               sp_offset -= (int) pow (2, G_FLD (inst->v, 6, 3));
 928             }
 929         }
 930       else
 931         {
 932           inst_len = SCORE_INSTLEN;
 933
 934           if (G_FLD(inst->v, 29, 25) == 0x3
 935               && G_FLD(inst->v, 2, 0) == 0x4
 936               && G_FLD(inst->v, 19, 15) == 0)
 937             {
 938                 /* sw rD, [r0, offset]+ */
 939                 sp_offset += SCORE_INSTLEN;
 940
 941                 if (G_FLD(inst->v, 24, 20) == 0x3)
 942                   {
 943                       /* rD = r3 */
 944                       if (ra_offset_p == 0)
 945                         {
 946                             ra_offset = sp_offset;
 947                             ra_offset_p = 1;
 948                         }
 949                   }
 950                 else if (G_FLD(inst->v, 24, 20) == 0x2)
 951                   {
 952                       /* rD = r2 */
 953                       if (fp_offset_p == 0)
 954                         {
 955                             fp_offset = sp_offset;
 956                             fp_offset_p = 1;
 957                         }
 958                   }
 959             }
 960           else if (G_FLD(inst->v, 29, 25) == 0x14
 961                    && G_FLD(inst->v, 19,15) == 0)
 962             {
 963                 /* sw rD, [r0, offset] */
 964                 if (G_FLD(inst->v, 24, 20) == 0x3)
 965                   {
 966                       /* rD = r3 */
 967                       ra_offset = sp_offset - G_FLD(inst->v, 14, 0);
 968                       ra_offset_p = 1;
 969                   }
 970                 else if (G_FLD(inst->v, 24, 20) == 0x2)
 971                   {
 972                       /* rD = r2 */
 973                       fp_offset = sp_offset - G_FLD(inst->v, 14, 0);
 974                       fp_offset_p = 1;
 975                   }
 976             }
 977           else if (G_FLD (inst->v, 29, 15) == 0x1c60
 978                    && G_FLD (inst->v, 2, 0) == 0x0)
 979             {
 980               /* lw r3, [r0]+, 4 */
 981               sp_offset -= SCORE_INSTLEN;
 982               ra_offset_p = 1;
 983             }
 984           else if (G_FLD (inst->v, 29, 15) == 0x1c40
 985                    && G_FLD (inst->v, 2, 0) == 0x0)
 986             {
 987               /* lw r2, [r0]+, 4 */
 988               sp_offset -= SCORE_INSTLEN;
 989               fp_offset_p = 1;
 990             }
 991
 992           else if (G_FLD (inst->v, 29, 17) == 0x100
 993                    && G_FLD (inst->v, 0, 0) == 0x0)
 994             {
 995               /* addi r0, -offset */
 996               sp_offset += 65536 - G_FLD (inst->v, 16, 1);
 997             }
 998           else if (G_FLD (inst->v, 29, 17) == 0x110
 999                    && G_FLD (inst->v, 0, 0) == 0x0)
1000             {
1001               /* addi r2, offset */
1002               if (pc - cur_pc > 4)
1003                 {
1004                   unsigned int save_v = inst->v;
1005                   inst_t *inst2 =
1006                     score7_fetch_inst (gdbarch, cur_pc + SCORE_INSTLEN, NULL);
1007                   if (inst2->v == 0x23)
1008                     {
1009                       /* mv! r0, r2 */
1010                       sp_offset -= G_FLD (save_v, 16, 1);
1011                     }
1012                 }
1013             }
1014         }
1015     }
1016
1017   /* Save RA.  */
1018   if (ra_offset_p == 1)
1019     {
1020       if (this_cache->saved_regs[SCORE_PC_REGNUM].addr == -1)
1021         this_cache->saved_regs[SCORE_PC_REGNUM].addr =
1022           sp + sp_offset - ra_offset;
1023     }
1024   else
1025     {
1026       this_cache->saved_regs[SCORE_PC_REGNUM] =
1027         this_cache->saved_regs[SCORE_RA_REGNUM];
1028     }
1029
1030   /* Save FP.  */
1031   if (fp_offset_p == 1)
1032     {
1033       if (this_cache->saved_regs[SCORE_FP_REGNUM].addr == -1)
1034         this_cache->saved_regs[SCORE_FP_REGNUM].addr =
1035           sp + sp_offset - fp_offset;
1036     }
1037
1038   /* Save SP and FP.  */
1039   this_cache->base = sp + sp_offset;
1040   this_cache->fp = fp;
1041
1042   /* Don't forget to free MEMBLOCK if we allocated it.  */
1043   if (memblock_ptr != NULL)
1044     score7_free_memblock (memblock_ptr);
1045 }
1046
1047 static void
1048 score3_analyze_prologue (CORE_ADDR startaddr, CORE_ADDR pc,
1049                         struct frame_info *this_frame,
1050                         struct score_frame_cache *this_cache)
1051 {
1052   CORE_ADDR sp;
1053   CORE_ADDR fp;
1054   CORE_ADDR cur_pc = startaddr;
1055   enum bfd_endian byte_order
1056     = gdbarch_byte_order (get_frame_arch (this_frame));
1057
1058   int sp_offset = 0;
1059   int ra_offset = 0;
1060   int fp_offset = 0;
1061   int ra_offset_p = 0;
1062   int fp_offset_p = 0;
1063   int inst_len = 0;
1064
1065   sp = get_frame_register_unsigned (this_frame, SCORE_SP_REGNUM);
1066   fp = get_frame_register_unsigned (this_frame, SCORE_FP_REGNUM);
1067
1068   for (; cur_pc < pc; cur_pc += inst_len)
1069     {
1070       inst_t *inst = NULL;
1071
1072       inst = score3_adjust_pc_and_fetch_inst (&cur_pc, &inst_len, byte_order);
1073
1074       /* FIXME: make a full-power prologue analyzer.  */
1075       if (inst->len == 2)
1076         {
1077           if (G_FLD (inst->v, 14, 12) == 0x0
1078               && G_FLD (inst->v, 11, 7) == 0x0
1079               && G_FLD (inst->v, 6, 5) == 0x3)
1080             {
1081               /* push! */
1082               sp_offset += 4;
1083
1084               if (G_FLD (inst->v, 4, 0) == 0x3
1085                   && ra_offset_p == 0)
1086                 {
1087                   /* push! r3, [r0] */
1088                   ra_offset = sp_offset;
1089                   ra_offset_p = 1;
1090                 }
1091               else if (G_FLD (inst->v, 4, 0) == 0x2
1092                        && fp_offset_p == 0)
1093                 {
1094                   /* push! r2, [r0] */
1095                   fp_offset = sp_offset;
1096                   fp_offset_p = 1;
1097                 }
1098             }
1099           else if (G_FLD (inst->v, 14, 12) == 0x6
1100                    && G_FLD (inst->v, 11, 10) == 0x3)
1101             {
1102               /* rpush! */
1103               int start_r = G_FLD (inst->v, 9, 5);
1104               int cnt = G_FLD (inst->v, 4, 0);
1105
1106               if ((ra_offset_p == 0)
1107                   && (start_r <= SCORE_RA_REGNUM)
1108                   && (SCORE_RA_REGNUM < start_r + cnt))
1109                 {
1110                   /* rpush! contains r3 */
1111                   ra_offset_p = 1;
1112                   ra_offset = sp_offset + 4 * (SCORE_RA_REGNUM - start_r) + 4;
1113                 }
1114
1115               if ((fp_offset_p == 0)
1116                   && (start_r <= SCORE_FP_REGNUM)
1117                   && (SCORE_FP_REGNUM < start_r + cnt))
1118                 {
1119                   /* rpush! contains r2 */
1120                   fp_offset_p = 1;
1121                   fp_offset = sp_offset + 4 * (SCORE_FP_REGNUM - start_r) + 4;
1122                 }
1123
1124               sp_offset += 4 * cnt;
1125             }
1126           else if (G_FLD (inst->v, 14, 12) == 0x0
1127                    && G_FLD (inst->v, 11, 7) == 0x0
1128                    && G_FLD (inst->v, 6, 5) == 0x2)
1129             {
1130               /* pop! */
1131               sp_offset -= 4;
1132             }
1133           else if (G_FLD (inst->v, 14, 12) == 0x6
1134                    && G_FLD (inst->v, 11, 10) == 0x2)
1135             {
1136               /* rpop! */
1137               sp_offset -= 4 * G_FLD (inst->v, 4, 0);
1138             }
1139           else if (G_FLD (inst->v, 14, 12) == 0x5
1140                    && G_FLD (inst->v, 11, 10) == 0x3
1141                    && G_FLD (inst->v, 9, 6) == 0x0)
1142             {
1143               /* addi! r0, -offset */
1144               int imm = G_FLD (inst->v, 5, 0);
1145               if (imm >> 5)
1146                 imm = -(0x3F - imm + 1);
1147               sp_offset -= imm;
1148             }
1149           else if (G_FLD (inst->v, 14, 12) == 0x5
1150                    && G_FLD (inst->v, 11, 10) == 0x3
1151                    && G_FLD (inst->v, 9, 6) == 0x2)
1152             {
1153               /* addi! r2, offset */
1154               if (pc - cur_pc >= 2)
1155                 {
1156                   inst_t *inst2;
1157
1158                   cur_pc += inst->len;
1159                   inst2 = score3_adjust_pc_and_fetch_inst (&cur_pc, NULL,
1160                                                            byte_order);
1161
1162                   if (inst2->len == 2
1163                       && G_FLD (inst2->v, 14, 10) == 0x10
1164                       && G_FLD (inst2->v, 9, 5) == 0x0
1165                       && G_FLD (inst2->v, 4, 0) == 0x2)
1166                     {
1167                       /* mv! r0, r2 */
1168                       int imm = G_FLD (inst->v, 5, 0);
1169                       if (imm >> 5)
1170                         imm = -(0x3F - imm + 1);
1171                       sp_offset -= imm;
1172                     }
1173                 }
1174             }
1175         }
1176       else if (inst->len == 4)
1177         {
1178           if (G_FLD (inst->v, 29, 25) == 0x3
1179               && G_FLD (inst->v, 2, 0) == 0x4
1180               && G_FLD (inst->v, 24, 20) == 0x3
1181               && G_FLD (inst->v, 19, 15) == 0x0)
1182             {
1183               /* sw r3, [r0, offset]+ */
1184               sp_offset += inst->len;
1185               if (ra_offset_p == 0)
1186                 {
1187                   ra_offset = sp_offset;
1188                   ra_offset_p = 1;
1189                 }
1190             }
1191           else if (G_FLD (inst->v, 29, 25) == 0x3
1192                    && G_FLD (inst->v, 2, 0) == 0x4
1193                    && G_FLD (inst->v, 24, 20) == 0x2
1194                    && G_FLD (inst->v, 19, 15) == 0x0)
1195             {
1196               /* sw r2, [r0, offset]+ */
1197               sp_offset += inst->len;
1198               if (fp_offset_p == 0)
1199                 {
1200                   fp_offset = sp_offset;
1201                   fp_offset_p = 1;
1202                 }
1203             }
1204           else if (G_FLD (inst->v, 29, 25) == 0x7
1205                    && G_FLD (inst->v, 2, 0) == 0x0
1206                    && G_FLD (inst->v, 24, 20) == 0x3
1207                    && G_FLD (inst->v, 19, 15) == 0x0)
1208             {
1209               /* lw r3, [r0]+, 4 */
1210               sp_offset -= inst->len;
1211               ra_offset_p = 1;
1212             }
1213           else if (G_FLD (inst->v, 29, 25) == 0x7
1214                    && G_FLD (inst->v, 2, 0) == 0x0
1215                    && G_FLD (inst->v, 24, 20) == 0x2
1216                    && G_FLD (inst->v, 19, 15) == 0x0)
1217             {
1218               /* lw r2, [r0]+, 4 */
1219               sp_offset -= inst->len;
1220               fp_offset_p = 1;
1221             }
1222           else if (G_FLD (inst->v, 29, 25) == 0x1
1223                    && G_FLD (inst->v, 19, 17) == 0x0
1224                    && G_FLD (inst->v, 24, 20) == 0x0
1225                    && G_FLD (inst->v, 0, 0) == 0x0)
1226             {
1227               /* addi r0, -offset */
1228               int imm = G_FLD (inst->v, 16, 1);
1229               if (imm >> 15)
1230                 imm = -(0xFFFF - imm + 1);
1231               sp_offset -= imm;
1232             }
1233           else if (G_FLD (inst->v, 29, 25) == 0x1
1234                    && G_FLD (inst->v, 19, 17) == 0x0
1235                    && G_FLD (inst->v, 24, 20) == 0x2
1236                    && G_FLD (inst->v, 0, 0) == 0x0)
1237             {
1238               /* addi r2, offset */
1239               if (pc - cur_pc >= 2)
1240                 {
1241                   inst_t *inst2;
1242
1243                   cur_pc += inst->len;
1244                   inst2 = score3_adjust_pc_and_fetch_inst (&cur_pc, NULL,
1245                                                            byte_order);
1246
1247                   if (inst2->len == 2
1248                       && G_FLD (inst2->v, 14, 10) == 0x10
1249                       && G_FLD (inst2->v, 9, 5) == 0x0
1250                       && G_FLD (inst2->v, 4, 0) == 0x2)
1251                     {
1252                       /* mv! r0, r2 */
1253                       int imm = G_FLD (inst->v, 16, 1);
1254                       if (imm >> 15)
1255                         imm = -(0xFFFF - imm + 1);
1256                       sp_offset -= imm;
1257                     }
1258                 }
1259             }
1260         }
1261     }
1262
1263   /* Save RA.  */
1264   if (ra_offset_p == 1)
1265     {
1266       if (this_cache->saved_regs[SCORE_PC_REGNUM].addr == -1)
1267         this_cache->saved_regs[SCORE_PC_REGNUM].addr =
1268           sp + sp_offset - ra_offset;
1269     }
1270   else
1271     {
1272       this_cache->saved_regs[SCORE_PC_REGNUM] =
1273         this_cache->saved_regs[SCORE_RA_REGNUM];
1274     }
1275
1276   /* Save FP.  */
1277   if (fp_offset_p == 1)
1278     {
1279       if (this_cache->saved_regs[SCORE_FP_REGNUM].addr == -1)
1280         this_cache->saved_regs[SCORE_FP_REGNUM].addr =
1281           sp + sp_offset - fp_offset;
1282     }
1283
1284   /* Save SP and FP.  */
1285   this_cache->base = sp + sp_offset;
1286   this_cache->fp = fp;
1287 }
1288
1289 static struct score_frame_cache *
1290 score_make_prologue_cache (struct frame_info *this_frame, void **this_cache)
1291 {
1292   struct score_frame_cache *cache;
1293
1294   if ((*this_cache) != NULL)
1295     return (struct score_frame_cache *) (*this_cache);
1296
1297   cache = FRAME_OBSTACK_ZALLOC (struct score_frame_cache);
1298   (*this_cache) = cache;
1299   cache->saved_regs = trad_frame_alloc_saved_regs (this_frame);
1300
1301   /* Analyze the prologue.  */
1302   {
1303     const CORE_ADDR pc = get_frame_pc (this_frame);
1304     CORE_ADDR start_addr;
1305
1306     find_pc_partial_function (pc, NULL, &start_addr, NULL);
1307     if (start_addr == 0)
1308       return cache;
1309
1310     if (target_mach == bfd_mach_score3)
1311       score3_analyze_prologue (start_addr, pc, this_frame,
1312                                (struct score_frame_cache *) *this_cache);
1313     else
1314       score7_analyze_prologue (start_addr, pc, this_frame,
1315                                (struct score_frame_cache *) *this_cache);
1316   }
1317
1318   /* Save SP.  */
1319   trad_frame_set_value (cache->saved_regs, SCORE_SP_REGNUM, cache->base);
1320
1321   return (struct score_frame_cache *) (*this_cache);
1322 }
1323
1324 static void
1325 score_prologue_this_id (struct frame_info *this_frame, void **this_cache,
1326                         struct frame_id *this_id)
1327 {
1328   struct score_frame_cache *info = score_make_prologue_cache (this_frame,
1329                                                               this_cache);
1330   (*this_id) = frame_id_build (info->base, get_frame_func (this_frame));
1331 }
1332
1333 static struct value *
1334 score_prologue_prev_register (struct frame_info *this_frame,
1335                               void **this_cache, int regnum)
1336 {
1337   struct score_frame_cache *info = score_make_prologue_cache (this_frame,
1338                                                               this_cache);
1339   return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum);
1340 }
1341
1342 static const struct frame_unwind score_prologue_unwind =
1343 {
1344   NORMAL_FRAME,
1345   default_frame_unwind_stop_reason,
1346   score_prologue_this_id,
1347   score_prologue_prev_register,
1348   NULL,
1349   default_frame_sniffer,
1350   NULL
1351 };
1352
1353 static CORE_ADDR
1354 score_prologue_frame_base_address (struct frame_info *this_frame,
1355                                    void **this_cache)
1356 {
1357   struct score_frame_cache *info =
1358     score_make_prologue_cache (this_frame, this_cache);
1359   return info->fp;
1360 }
1361
1362 static const struct frame_base score_prologue_frame_base =
1363 {
1364   &score_prologue_unwind,
1365   score_prologue_frame_base_address,
1366   score_prologue_frame_base_address,
1367   score_prologue_frame_base_address,
1368 };
1369
1370 static const struct frame_base *
1371 score_prologue_frame_base_sniffer (struct frame_info *this_frame)
1372 {
1373   return &score_prologue_frame_base;
1374 }
1375
1376 /* Core file support.  */
1377
1378 static const struct regcache_map_entry score7_linux_gregmap[] =
1379   {
1380     /* FIXME: According to the current Linux kernel, r0 is preceded by
1381        9 rather than 7 words.  */
1382     { 7, REGCACHE_MAP_SKIP, 4 },
1383     { 32, 0, 4 },               /* r0 ... r31 */
1384     { 1, 55, 4 },               /* CEL */
1385     { 1, 54, 4 },               /* CEH */
1386     { 1, 53, 4 },               /* sr0, i.e. cnt or COUNTER */
1387     { 1, 52, 4 },               /* sr1, i.e. lcr or LDCR */
1388     { 1, 51, 4 },               /* sr2, i.e. scr or STCR */
1389     { 1, 49, 4 },               /* PC (same slot as EPC) */
1390     { 1, 38, 4 },               /* EMA */
1391     { 1, 32, 4 },               /* PSR */
1392     { 1, 34, 4 },               /* ECR */
1393     { 1, 33, 4 },               /* COND */
1394     { 0 }
1395   };
1396
1397 #define SCORE7_LINUX_EPC_OFFSET (44 * 4)
1398 #define SCORE7_LINUX_SIZEOF_GREGSET (49 * 4)
1399
1400 static void
1401 score7_linux_supply_gregset(const struct regset *regset,
1402                             struct regcache *regcache,
1403                             int regnum, const void *buf,
1404                             size_t size)
1405 {
1406   regcache_supply_regset (regset, regcache, regnum, buf, size);
1407
1408   /* Supply the EPC from the same slot as the PC.  Note that the
1409      collect function will store the PC in that slot.  */
1410   if ((regnum == -1 || regnum == SCORE_EPC_REGNUM)
1411       && size >= SCORE7_LINUX_EPC_OFFSET + 4)
1412     regcache->raw_supply
1413       (SCORE_EPC_REGNUM, (const gdb_byte *) buf + SCORE7_LINUX_EPC_OFFSET);
1414 }
1415
1416 static const struct regset score7_linux_gregset =
1417   {
1418     score7_linux_gregmap,
1419     score7_linux_supply_gregset,
1420     regcache_collect_regset
1421   };
1422
1423 /* Iterate over core file register note sections.  */
1424
1425 static void
1426 score7_linux_iterate_over_regset_sections (struct gdbarch *gdbarch,
1427                                            iterate_over_regset_sections_cb *cb,
1428                                            void *cb_data,
1429                                            const struct regcache *regcache)
1430 {
1431   cb (".reg", SCORE7_LINUX_SIZEOF_GREGSET, SCORE7_LINUX_SIZEOF_GREGSET,
1432       &score7_linux_gregset, NULL, cb_data);
1433 }
1434
1435 static struct gdbarch *
1436 score_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches)
1437 {
1438   struct gdbarch *gdbarch;
1439   target_mach = info.bfd_arch_info->mach;
1440
1441   arches = gdbarch_list_lookup_by_info (arches, &info);
1442   if (arches != NULL)
1443     {
1444       return (arches->gdbarch);
1445     }
1446   gdbarch = gdbarch_alloc (&info, NULL);
1447
1448   set_gdbarch_short_bit (gdbarch, 16);
1449   set_gdbarch_int_bit (gdbarch, 32);
1450   set_gdbarch_float_bit (gdbarch, 32);
1451   set_gdbarch_double_bit (gdbarch, 64);
1452   set_gdbarch_long_double_bit (gdbarch, 64);
1453 #if WITH_SIM
1454   set_gdbarch_register_sim_regno (gdbarch, score_register_sim_regno);
1455 #endif
1456   set_gdbarch_pc_regnum (gdbarch, SCORE_PC_REGNUM);
1457   set_gdbarch_sp_regnum (gdbarch, SCORE_SP_REGNUM);
1458   set_gdbarch_adjust_breakpoint_address (gdbarch,
1459                                          score_adjust_breakpoint_address);
1460   set_gdbarch_register_type (gdbarch, score_register_type);
1461   set_gdbarch_frame_align (gdbarch, score_frame_align);
1462   set_gdbarch_inner_than (gdbarch, core_addr_lessthan);
1463
1464   switch (target_mach)
1465     {
1466     case bfd_mach_score7:
1467       set_gdbarch_breakpoint_kind_from_pc (gdbarch,
1468                                            score7_breakpoint_kind_from_pc);
1469       set_gdbarch_sw_breakpoint_from_kind (gdbarch,
1470                                            score7_sw_breakpoint_from_kind);
1471       set_gdbarch_skip_prologue (gdbarch, score7_skip_prologue);
1472       set_gdbarch_stack_frame_destroyed_p (gdbarch,
1473                                            score7_stack_frame_destroyed_p);
1474       set_gdbarch_register_name (gdbarch, score7_register_name);
1475       set_gdbarch_num_regs (gdbarch, SCORE7_NUM_REGS);
1476       /* Core file support.  */
1477       set_gdbarch_iterate_over_regset_sections
1478         (gdbarch, score7_linux_iterate_over_regset_sections);
1479       break;
1480
1481     case bfd_mach_score3:
1482       set_gdbarch_breakpoint_kind_from_pc (gdbarch,
1483                                            score3_breakpoint_kind_from_pc);
1484       set_gdbarch_sw_breakpoint_from_kind (gdbarch,
1485                                            score3_sw_breakpoint_from_kind);
1486       set_gdbarch_skip_prologue (gdbarch, score3_skip_prologue);
1487       set_gdbarch_stack_frame_destroyed_p (gdbarch,
1488                                            score3_stack_frame_destroyed_p);
1489       set_gdbarch_register_name (gdbarch, score3_register_name);
1490       set_gdbarch_num_regs (gdbarch, SCORE3_NUM_REGS);
1491       break;
1492     }
1493
1494   /* Watchpoint hooks.  */
1495   set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1);
1496
1497   /* Dummy frame hooks.  */
1498   set_gdbarch_return_value (gdbarch, score_return_value);
1499   set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT);
1500   set_gdbarch_push_dummy_call (gdbarch, score_push_dummy_call);
1501
1502   /* Normal frame hooks.  */
1503   dwarf2_append_unwinders (gdbarch);
1504   frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer);
1505   frame_unwind_append_unwinder (gdbarch, &score_prologue_unwind);
1506   frame_base_append_sniffer (gdbarch, score_prologue_frame_base_sniffer);
1507
1508   return gdbarch;
1509 }
1510
1511 void
1512 _initialize_score_tdep (void)
1513 {
1514   gdbarch_register (bfd_arch_score, score_gdbarch_init, NULL);
1515 }