| 1 | /* Target-dependent code for the S+core architecture, for GDB, |
| 2 | the GNU Debugger. |
| 3 | |
| 4 | Copyright (C) 2006, 2007 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 2 of the License, or |
| 14 | (at your option) any later version. |
| 15 | |
| 16 | This program is distributed in the hope that it will be useful, |
| 17 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 18 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 19 | GNU General Public License for more details. |
| 20 | |
| 21 | You should have received a copy of the GNU General Public License |
| 22 | along with this program; if not, write to the Free Software |
| 23 | Foundation, Inc., 51 Franklin Street, Fifth Floor, |
| 24 | Boston, MA 02110-1301, USA. */ |
| 25 | |
| 26 | #include "defs.h" |
| 27 | #include "gdb_assert.h" |
| 28 | #include "inferior.h" |
| 29 | #include "symtab.h" |
| 30 | #include "objfiles.h" |
| 31 | #include "gdbcore.h" |
| 32 | #include "target.h" |
| 33 | #include "arch-utils.h" |
| 34 | #include "regcache.h" |
| 35 | #include "dis-asm.h" |
| 36 | #include "frame-unwind.h" |
| 37 | #include "frame-base.h" |
| 38 | #include "trad-frame.h" |
| 39 | #include "dwarf2-frame.h" |
| 40 | #include "score-tdep.h" |
| 41 | |
| 42 | #define G_FLD(_i,_ms,_ls) (((_i) << (31 - (_ms))) >> (31 - (_ms) + (_ls))) |
| 43 | #define RM_PBITS(_raw) ((G_FLD(_raw, 31, 16) << 15) | G_FLD(_raw, 14, 0)) |
| 44 | |
| 45 | typedef struct{ |
| 46 | unsigned int v; |
| 47 | unsigned int raw; |
| 48 | char is15; |
| 49 | }inst_t; |
| 50 | |
| 51 | struct score_frame_cache |
| 52 | { |
| 53 | CORE_ADDR base; |
| 54 | struct trad_frame_saved_reg *saved_regs; |
| 55 | }; |
| 56 | |
| 57 | #if 0 |
| 58 | /* If S+core GCC will generate these instructions in the prologue: |
| 59 | |
| 60 | lw rx, imm1 |
| 61 | addi rx, -imm2 |
| 62 | mv! r2, rx |
| 63 | |
| 64 | then .pdr section is used. */ |
| 65 | |
| 66 | #define P_SIZE 8 |
| 67 | #define PI_SYM 0 |
| 68 | #define PI_R_MSK 1 |
| 69 | #define PI_R_OFF 2 |
| 70 | #define PI_R_LEF 4 |
| 71 | #define PI_F_OFF 5 |
| 72 | #define PI_F_REG 6 |
| 73 | #define PI_RAREG 7 |
| 74 | |
| 75 | typedef struct frame_extra_info |
| 76 | { |
| 77 | CORE_ADDR p_frame; |
| 78 | unsigned int pdr[P_SIZE]; |
| 79 | } extra_info_t; |
| 80 | |
| 81 | struct obj_priv |
| 82 | { |
| 83 | bfd_size_type size; |
| 84 | char *contents; |
| 85 | }; |
| 86 | |
| 87 | static bfd *the_bfd; |
| 88 | |
| 89 | static int |
| 90 | score_compare_pdr_entries (const void *a, const void *b) |
| 91 | { |
| 92 | CORE_ADDR lhs = bfd_get_32 (the_bfd, (bfd_byte *) a); |
| 93 | CORE_ADDR rhs = bfd_get_32 (the_bfd, (bfd_byte *) b); |
| 94 | if (lhs < rhs) |
| 95 | return -1; |
| 96 | else if (lhs == rhs) |
| 97 | return 0; |
| 98 | else |
| 99 | return 1; |
| 100 | } |
| 101 | |
| 102 | static void |
| 103 | score_analyze_pdr_section (CORE_ADDR startaddr, CORE_ADDR pc, |
| 104 | struct frame_info *next_frame, |
| 105 | struct score_frame_cache *this_cache) |
| 106 | { |
| 107 | struct symbol *sym; |
| 108 | struct obj_section *sec; |
| 109 | extra_info_t *fci_ext; |
| 110 | CORE_ADDR leaf_ra_stack_addr = -1; |
| 111 | |
| 112 | gdb_assert (startaddr <= pc); |
| 113 | gdb_assert (this_cache != NULL); |
| 114 | |
| 115 | fci_ext = frame_obstack_zalloc (sizeof (extra_info_t)); |
| 116 | if ((sec = find_pc_section (pc)) == NULL) |
| 117 | { |
| 118 | error ("Can't find section in file:%s, line:%d!", __FILE__, __LINE__); |
| 119 | return; |
| 120 | } |
| 121 | |
| 122 | /* Anylyze .pdr section and get coresponding fields. */ |
| 123 | { |
| 124 | static struct obj_priv *priv = NULL; |
| 125 | |
| 126 | if (priv == NULL) |
| 127 | { |
| 128 | asection *bfdsec; |
| 129 | priv = obstack_alloc (&sec->objfile->objfile_obstack, |
| 130 | sizeof (struct obj_priv)); |
| 131 | if ((bfdsec = bfd_get_section_by_name (sec->objfile->obfd, ".pdr"))) |
| 132 | { |
| 133 | priv->size = bfd_section_size (sec->objfile->obfd, bfdsec); |
| 134 | priv->contents = obstack_alloc (&sec->objfile->objfile_obstack, |
| 135 | priv->size); |
| 136 | bfd_get_section_contents (sec->objfile->obfd, bfdsec, |
| 137 | priv->contents, 0, priv->size); |
| 138 | the_bfd = sec->objfile->obfd; |
| 139 | qsort (priv->contents, priv->size / 32, 32, |
| 140 | score_compare_pdr_entries); |
| 141 | the_bfd = NULL; |
| 142 | } |
| 143 | else |
| 144 | priv->size = 0; |
| 145 | } |
| 146 | if (priv->size != 0) |
| 147 | { |
| 148 | int low = 0, mid, high = priv->size / 32; |
| 149 | char *ptr; |
| 150 | do |
| 151 | |
| 152 | { |
| 153 | CORE_ADDR pdr_pc; |
| 154 | mid = (low + high) / 2; |
| 155 | ptr = priv->contents + mid * 32; |
| 156 | pdr_pc = bfd_get_signed_32 (sec->objfile->obfd, ptr); |
| 157 | pdr_pc += ANOFFSET (sec->objfile->section_offsets, |
| 158 | SECT_OFF_TEXT (sec->objfile)); |
| 159 | if (pdr_pc == startaddr) |
| 160 | break; |
| 161 | if (pdr_pc > startaddr) |
| 162 | high = mid; |
| 163 | else |
| 164 | low = mid + 1; |
| 165 | } |
| 166 | while (low != high); |
| 167 | |
| 168 | if (low != high) |
| 169 | { |
| 170 | gdb_assert (bfd_get_32 (sec->objfile->obfd, ptr) == startaddr); |
| 171 | #define EXT_PDR(_pi) bfd_get_32(sec->objfile->obfd, ptr+((_pi)<<2)) |
| 172 | fci_ext->pdr[PI_SYM] = EXT_PDR (PI_SYM); |
| 173 | fci_ext->pdr[PI_R_MSK] = EXT_PDR (PI_R_MSK); |
| 174 | fci_ext->pdr[PI_R_OFF] = EXT_PDR (PI_R_OFF); |
| 175 | fci_ext->pdr[PI_R_LEF] = EXT_PDR (PI_R_LEF); |
| 176 | fci_ext->pdr[PI_F_OFF] = EXT_PDR (PI_F_OFF); |
| 177 | fci_ext->pdr[PI_F_REG] = EXT_PDR (PI_F_REG); |
| 178 | fci_ext->pdr[PI_RAREG] = EXT_PDR (PI_RAREG); |
| 179 | #undef EXT_PDR |
| 180 | } |
| 181 | } |
| 182 | } |
| 183 | } |
| 184 | #endif |
| 185 | |
| 186 | static struct type * |
| 187 | score_register_type (struct gdbarch *gdbarch, int regnum) |
| 188 | { |
| 189 | gdb_assert (regnum >= 0 && regnum < SCORE_NUM_REGS); |
| 190 | return builtin_type_uint32; |
| 191 | } |
| 192 | |
| 193 | static LONGEST |
| 194 | score_read_unsigned_register (int regnum) |
| 195 | { |
| 196 | LONGEST val; |
| 197 | regcache_cooked_read_unsigned (current_regcache, regnum, &val); |
| 198 | return val; |
| 199 | } |
| 200 | |
| 201 | static CORE_ADDR |
| 202 | score_read_sp (void) |
| 203 | { |
| 204 | return score_read_unsigned_register (SCORE_SP_REGNUM); |
| 205 | } |
| 206 | |
| 207 | static CORE_ADDR |
| 208 | score_unwind_pc (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 209 | { |
| 210 | return frame_unwind_register_unsigned (next_frame, SCORE_PC_REGNUM); |
| 211 | } |
| 212 | |
| 213 | static const char * |
| 214 | score_register_name (int regnum) |
| 215 | { |
| 216 | const char *score_register_names[] = { |
| 217 | "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", |
| 218 | "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", |
| 219 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", |
| 220 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", |
| 221 | |
| 222 | "PSR", "COND", "ECR", "EXCPVEC", |
| 223 | "CCR", "EPC", "EMA", "TLBLOCK", |
| 224 | "TLBPT", "PEADDR", "TLBRPT", "PEVN", |
| 225 | "PECTX", "LIMPFN", "LDMPFN", "PREV", |
| 226 | "DREG", "PC", "DSAVE", "COUNTER", |
| 227 | "LDCR", "STCR", "CEH", "CEL", |
| 228 | }; |
| 229 | |
| 230 | gdb_assert (regnum >= 0 && regnum < SCORE_NUM_REGS); |
| 231 | return score_register_names[regnum]; |
| 232 | } |
| 233 | |
| 234 | static int |
| 235 | score_register_sim_regno (int regnum) |
| 236 | { |
| 237 | gdb_assert (regnum >= 0 && regnum < SCORE_NUM_REGS); |
| 238 | return regnum; |
| 239 | } |
| 240 | |
| 241 | static int |
| 242 | score_print_insn (bfd_vma memaddr, struct disassemble_info *info) |
| 243 | { |
| 244 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 245 | return print_insn_big_score (memaddr, info); |
| 246 | else |
| 247 | return print_insn_little_score (memaddr, info); |
| 248 | } |
| 249 | |
| 250 | static const gdb_byte * |
| 251 | score_breakpoint_from_pc (CORE_ADDR *pcptr, int *lenptr) |
| 252 | { |
| 253 | gdb_byte buf[SCORE_INSTLEN] = { 0 }; |
| 254 | int ret; |
| 255 | unsigned int raw; |
| 256 | |
| 257 | if ((ret = target_read_memory (*pcptr & ~0x3, buf, SCORE_INSTLEN)) != 0) |
| 258 | { |
| 259 | memory_error (ret, *pcptr); |
| 260 | } |
| 261 | raw = extract_unsigned_integer (buf, SCORE_INSTLEN); |
| 262 | |
| 263 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG) |
| 264 | { |
| 265 | if (!(raw & 0x80008000)) |
| 266 | { |
| 267 | /* 16bits instruction. */ |
| 268 | static gdb_byte big_breakpoint16[] = { 0x60, 0x02 }; |
| 269 | *pcptr &= ~0x1; |
| 270 | *lenptr = sizeof (big_breakpoint16); |
| 271 | return big_breakpoint16; |
| 272 | } |
| 273 | else |
| 274 | { |
| 275 | /* 32bits instruction. */ |
| 276 | static gdb_byte big_breakpoint32[] = { 0x80, 0x00, 0x80, 0x06 }; |
| 277 | *pcptr &= ~0x3; |
| 278 | *lenptr = sizeof (big_breakpoint32); |
| 279 | return big_breakpoint32; |
| 280 | } |
| 281 | } |
| 282 | else |
| 283 | { |
| 284 | if (!(raw & 0x80008000)) |
| 285 | { |
| 286 | /* 16bits instruction. */ |
| 287 | static gdb_byte little_breakpoint16[] = { 0x02, 0x60 }; |
| 288 | *pcptr &= ~0x1; |
| 289 | *lenptr = sizeof (little_breakpoint16); |
| 290 | return little_breakpoint16; |
| 291 | } |
| 292 | else |
| 293 | { |
| 294 | /* 32bits instruction. */ |
| 295 | static gdb_byte little_breakpoint32[] = { 0x06, 0x80, 0x00, 0x80 }; |
| 296 | *pcptr &= ~0x3; |
| 297 | *lenptr = sizeof (little_breakpoint32); |
| 298 | return little_breakpoint32; |
| 299 | } |
| 300 | } |
| 301 | } |
| 302 | |
| 303 | static CORE_ADDR |
| 304 | score_frame_align (struct gdbarch *gdbarch, CORE_ADDR addr) |
| 305 | { |
| 306 | return align_down (addr, 16); |
| 307 | } |
| 308 | |
| 309 | static void |
| 310 | score_xfer_register (struct regcache *regcache, int regnum, int length, |
| 311 | enum bfd_endian endian, gdb_byte *readbuf, |
| 312 | const gdb_byte *writebuf, int buf_offset) |
| 313 | { |
| 314 | int reg_offset = 0; |
| 315 | gdb_assert (regnum >= 0 && regnum < SCORE_NUM_REGS); |
| 316 | |
| 317 | switch (endian) |
| 318 | { |
| 319 | case BFD_ENDIAN_BIG: |
| 320 | reg_offset = SCORE_REGSIZE - length; |
| 321 | break; |
| 322 | case BFD_ENDIAN_LITTLE: |
| 323 | reg_offset = 0; |
| 324 | break; |
| 325 | case BFD_ENDIAN_UNKNOWN: |
| 326 | reg_offset = 0; |
| 327 | break; |
| 328 | default: |
| 329 | internal_error (__FILE__, __LINE__, _("score_xfer_register error!")); |
| 330 | } |
| 331 | |
| 332 | if (readbuf != NULL) |
| 333 | regcache_cooked_read_part (regcache, regnum, reg_offset, length, |
| 334 | readbuf + buf_offset); |
| 335 | if (writebuf != NULL) |
| 336 | regcache_cooked_write_part (regcache, regnum, reg_offset, length, |
| 337 | writebuf + buf_offset); |
| 338 | } |
| 339 | |
| 340 | static enum return_value_convention |
| 341 | score_return_value (struct gdbarch *gdbarch, struct type *type, |
| 342 | struct regcache *regcache, |
| 343 | gdb_byte * readbuf, const gdb_byte * writebuf) |
| 344 | { |
| 345 | if (TYPE_CODE (type) == TYPE_CODE_STRUCT |
| 346 | || TYPE_CODE (type) == TYPE_CODE_UNION |
| 347 | || TYPE_CODE (type) == TYPE_CODE_ARRAY) |
| 348 | return RETURN_VALUE_STRUCT_CONVENTION; |
| 349 | else |
| 350 | { |
| 351 | int offset; |
| 352 | int regnum; |
| 353 | for (offset = 0, regnum = SCORE_A0_REGNUM; |
| 354 | offset < TYPE_LENGTH (type); |
| 355 | offset += SCORE_REGSIZE, regnum++) |
| 356 | { |
| 357 | int xfer = SCORE_REGSIZE; |
| 358 | if (offset + xfer > TYPE_LENGTH (type)) |
| 359 | xfer = TYPE_LENGTH (type) - offset; |
| 360 | score_xfer_register (regcache, regnum, xfer, TARGET_BYTE_ORDER, |
| 361 | readbuf, writebuf, offset); |
| 362 | } |
| 363 | return RETURN_VALUE_REGISTER_CONVENTION; |
| 364 | } |
| 365 | } |
| 366 | |
| 367 | static struct frame_id |
| 368 | score_unwind_dummy_id (struct gdbarch *gdbarch, struct frame_info *next_frame) |
| 369 | { |
| 370 | return frame_id_build ( |
| 371 | frame_unwind_register_unsigned (next_frame, SCORE_SP_REGNUM), |
| 372 | frame_pc_unwind (next_frame)); |
| 373 | } |
| 374 | |
| 375 | static int |
| 376 | score_type_needs_double_align (struct type *type) |
| 377 | { |
| 378 | enum type_code typecode = TYPE_CODE (type); |
| 379 | |
| 380 | if (typecode == TYPE_CODE_INT && TYPE_LENGTH (type) == 8) |
| 381 | return 1; |
| 382 | if (typecode == TYPE_CODE_FLT && TYPE_LENGTH (type) == 8) |
| 383 | return 1; |
| 384 | else if (typecode == TYPE_CODE_STRUCT || typecode == TYPE_CODE_UNION) |
| 385 | { |
| 386 | int i, n; |
| 387 | |
| 388 | n = TYPE_NFIELDS (type); |
| 389 | for (i = 0; i < n; i++) |
| 390 | if (score_type_needs_double_align (TYPE_FIELD_TYPE (type, i))) |
| 391 | return 1; |
| 392 | return 0; |
| 393 | } |
| 394 | return 0; |
| 395 | } |
| 396 | |
| 397 | static CORE_ADDR |
| 398 | score_push_dummy_call (struct gdbarch *gdbarch, struct value *function, |
| 399 | struct regcache *regcache, CORE_ADDR bp_addr, |
| 400 | int nargs, struct value **args, CORE_ADDR sp, |
| 401 | int struct_return, CORE_ADDR struct_addr) |
| 402 | { |
| 403 | int argnum; |
| 404 | int argreg; |
| 405 | int arglen = 0; |
| 406 | CORE_ADDR stack_offset = 0; |
| 407 | CORE_ADDR addr = 0; |
| 408 | |
| 409 | /* Step 1, Save RA. */ |
| 410 | regcache_cooked_write_unsigned (regcache, SCORE_RA_REGNUM, bp_addr); |
| 411 | |
| 412 | /* Step 2, Make space on the stack for the args. */ |
| 413 | struct_addr = align_down (struct_addr, 16); |
| 414 | sp = align_down (sp, 16); |
| 415 | for (argnum = 0; argnum < nargs; argnum++) |
| 416 | arglen += align_up (TYPE_LENGTH (value_type (args[argnum])), |
| 417 | SCORE_REGSIZE); |
| 418 | sp -= align_up (arglen, 16); |
| 419 | |
| 420 | argreg = SCORE_BEGIN_ARG_REGNUM; |
| 421 | |
| 422 | /* Step 3, Check if struct return then save the struct address to r4 and |
| 423 | increase the stack_offset by 4. */ |
| 424 | if (struct_return) |
| 425 | { |
| 426 | regcache_cooked_write_unsigned (regcache, argreg++, struct_addr); |
| 427 | stack_offset += SCORE_REGSIZE; |
| 428 | } |
| 429 | |
| 430 | /* Step 4, Load arguments: |
| 431 | If arg length is too long (> 4 bytes), |
| 432 | then split the arg and save every parts. */ |
| 433 | for (argnum = 0; argnum < nargs; argnum++) |
| 434 | { |
| 435 | struct value *arg = args[argnum]; |
| 436 | struct type *arg_type = check_typedef (value_type (arg)); |
| 437 | enum type_code typecode = TYPE_CODE (arg_type); |
| 438 | const gdb_byte *val = value_contents (arg); |
| 439 | int downward_offset = 0; |
| 440 | int odd_sized_struct_p; |
| 441 | int arg_last_part_p = 0; |
| 442 | |
| 443 | arglen = TYPE_LENGTH (arg_type); |
| 444 | odd_sized_struct_p = (arglen > SCORE_REGSIZE |
| 445 | && arglen % SCORE_REGSIZE != 0); |
| 446 | |
| 447 | /* If a arg should be aligned to 8 bytes (long long or double), |
| 448 | the value should be put to even register numbers. */ |
| 449 | if (score_type_needs_double_align (arg_type)) |
| 450 | { |
| 451 | if (argreg & 1) |
| 452 | argreg++; |
| 453 | } |
| 454 | |
| 455 | /* If sizeof a block < SCORE_REGSIZE, then Score GCC will chose |
| 456 | the default "downward"/"upward" method: |
| 457 | |
| 458 | Example: |
| 459 | |
| 460 | struct struc |
| 461 | { |
| 462 | char a; char b; char c; |
| 463 | } s = {'a', 'b', 'c'}; |
| 464 | |
| 465 | Big endian: s = {X, 'a', 'b', 'c'} |
| 466 | Little endian: s = {'a', 'b', 'c', X} |
| 467 | |
| 468 | Where X is a hole. */ |
| 469 | |
| 470 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG |
| 471 | && (typecode == TYPE_CODE_STRUCT |
| 472 | || typecode == TYPE_CODE_UNION) |
| 473 | && argreg > SCORE_LAST_ARG_REGNUM |
| 474 | && arglen < SCORE_REGSIZE) |
| 475 | downward_offset += (SCORE_REGSIZE - arglen); |
| 476 | |
| 477 | while (arglen > 0) |
| 478 | { |
| 479 | int partial_len = arglen < SCORE_REGSIZE ? arglen : SCORE_REGSIZE; |
| 480 | ULONGEST regval = extract_unsigned_integer (val, partial_len); |
| 481 | |
| 482 | /* The last part of a arg should shift left when |
| 483 | TARGET_BYTE_ORDER is BFD_ENDIAN_BIG. */ |
| 484 | if (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG |
| 485 | && arg_last_part_p == 1 |
| 486 | && (typecode == TYPE_CODE_STRUCT |
| 487 | || typecode == TYPE_CODE_UNION)) |
| 488 | regval <<= ((SCORE_REGSIZE - partial_len) * TARGET_CHAR_BIT); |
| 489 | |
| 490 | /* Always increase the stack_offset and save args to stack. */ |
| 491 | addr = sp + stack_offset + downward_offset; |
| 492 | write_memory (addr, val, partial_len); |
| 493 | |
| 494 | if (argreg <= SCORE_LAST_ARG_REGNUM) |
| 495 | { |
| 496 | regcache_cooked_write_unsigned (regcache, argreg++, regval); |
| 497 | if (arglen > SCORE_REGSIZE && arglen < SCORE_REGSIZE * 2) |
| 498 | arg_last_part_p = 1; |
| 499 | } |
| 500 | |
| 501 | val += partial_len; |
| 502 | arglen -= partial_len; |
| 503 | stack_offset += align_up (partial_len, SCORE_REGSIZE); |
| 504 | } |
| 505 | } |
| 506 | |
| 507 | /* Step 5, Save SP. */ |
| 508 | regcache_cooked_write_unsigned (regcache, SCORE_SP_REGNUM, sp); |
| 509 | |
| 510 | return sp; |
| 511 | } |
| 512 | |
| 513 | static inst_t * |
| 514 | score_fetch_instruction (CORE_ADDR addr) |
| 515 | { |
| 516 | static inst_t inst = { 0, 0 }; |
| 517 | char buf[SCORE_INSTLEN]; |
| 518 | int big; |
| 519 | int ret = target_read_memory (addr & ~0x3, buf, SCORE_INSTLEN); |
| 520 | unsigned int raw; |
| 521 | |
| 522 | if (ret) |
| 523 | { |
| 524 | memory_error (ret, addr); |
| 525 | return 0; |
| 526 | } |
| 527 | inst.raw = extract_unsigned_integer (buf, SCORE_INSTLEN); |
| 528 | inst.is15 = !(inst.raw & 0x80008000); |
| 529 | inst.v = RM_PBITS (inst.raw); |
| 530 | big = (TARGET_BYTE_ORDER == BFD_ENDIAN_BIG); |
| 531 | |
| 532 | if (inst.is15) |
| 533 | { |
| 534 | if (big ^ ((addr & 0x2) == 2)) |
| 535 | inst.v = G_FLD (inst.v, 29, 15); |
| 536 | else |
| 537 | inst.v = G_FLD (inst.v, 14, 0); |
| 538 | } |
| 539 | return &inst; |
| 540 | } |
| 541 | |
| 542 | static CORE_ADDR |
| 543 | score_skip_prologue (CORE_ADDR pc) |
| 544 | { |
| 545 | CORE_ADDR cpc = pc; |
| 546 | int iscan = 32, stack_sub = 0; |
| 547 | while (iscan-- > 0) |
| 548 | { |
| 549 | inst_t *inst = score_fetch_instruction (cpc); |
| 550 | if (!inst) |
| 551 | break; |
| 552 | if (!inst->is15 && !stack_sub |
| 553 | && (G_FLD (inst->v, 29, 25) == 0x1 |
| 554 | && G_FLD (inst->v, 24, 20) == 0x0)) |
| 555 | { |
| 556 | /* addi r0, offset */ |
| 557 | pc = stack_sub = cpc + SCORE_INSTLEN; |
| 558 | } |
| 559 | else if (!inst->is15 |
| 560 | && inst->v == RM_PBITS (0x8040bc56)) |
| 561 | { |
| 562 | /* mv r2, r0 */ |
| 563 | pc = cpc + SCORE_INSTLEN; |
| 564 | break; |
| 565 | } |
| 566 | else if (inst->is15 |
| 567 | && inst->v == RM_PBITS (0x0203)) |
| 568 | { |
| 569 | /* mv! r2, r0 */ |
| 570 | pc = cpc + SCORE16_INSTLEN; |
| 571 | break; |
| 572 | } |
| 573 | else if (inst->is15 |
| 574 | && ((G_FLD (inst->v, 14, 12) == 3) /* j15 form */ |
| 575 | || (G_FLD (inst->v, 14, 12) == 4) /* b15 form */ |
| 576 | || (G_FLD (inst->v, 14, 12) == 0x0 |
| 577 | && G_FLD (inst->v, 3, 0) == 0x4))) /* br! */ |
| 578 | break; |
| 579 | else if (!inst->is15 |
| 580 | && ((G_FLD (inst->v, 29, 25) == 2) /* j32 form */ |
| 581 | || (G_FLD (inst->v, 29, 25) == 4) /* b32 form */ |
| 582 | || (G_FLD (inst->v, 29, 25) == 0x0 |
| 583 | && G_FLD (inst->v, 6, 1) == 0x4))) /* br */ |
| 584 | break; |
| 585 | |
| 586 | cpc += inst->is15 ? SCORE16_INSTLEN : SCORE_INSTLEN; |
| 587 | } |
| 588 | return pc; |
| 589 | } |
| 590 | |
| 591 | static int |
| 592 | score_in_function_epilogue_p (struct gdbarch *gdbarch, CORE_ADDR cur_pc) |
| 593 | { |
| 594 | inst_t *inst = score_fetch_instruction (cur_pc); |
| 595 | |
| 596 | if (inst->v == 0x23) |
| 597 | return 1; /* mv! r0, r2 */ |
| 598 | else if (G_FLD (inst->v, 14, 12) == 0x2 |
| 599 | && G_FLD (inst->v, 3, 0) == 0xa) |
| 600 | return 1; /* pop! */ |
| 601 | else if (G_FLD (inst->v, 14, 12) == 0x0 |
| 602 | && G_FLD (inst->v, 7, 0) == 0x34) |
| 603 | return 1; /* br! r3 */ |
| 604 | else if (G_FLD (inst->v, 29, 15) == 0x2 |
| 605 | && G_FLD (inst->v, 6, 1) == 0x2b) |
| 606 | return 1; /* mv r0, r2 */ |
| 607 | else if (G_FLD (inst->v, 29, 25) == 0x0 |
| 608 | && G_FLD (inst->v, 6, 1) == 0x4 |
| 609 | && G_FLD (inst->v, 19, 15) == 0x3) |
| 610 | return 1; /* br r3 */ |
| 611 | else |
| 612 | return 0; |
| 613 | } |
| 614 | |
| 615 | static void |
| 616 | score_analyze_prologue (CORE_ADDR startaddr, CORE_ADDR pc, |
| 617 | struct frame_info *next_frame, |
| 618 | struct score_frame_cache *this_cache) |
| 619 | { |
| 620 | CORE_ADDR sp; |
| 621 | CORE_ADDR cur_pc = startaddr; |
| 622 | |
| 623 | int sp_offset = 0; |
| 624 | int ra_offset = 0; |
| 625 | int fp_offset = 0; |
| 626 | int ra_offset_p = 0; |
| 627 | int fp_offset_p = 0; |
| 628 | int inst_len = 0; |
| 629 | |
| 630 | sp = frame_unwind_register_unsigned (next_frame, SCORE_SP_REGNUM); |
| 631 | |
| 632 | for (; cur_pc < pc; cur_pc += inst_len) |
| 633 | { |
| 634 | inst_t *inst = score_fetch_instruction (cur_pc); |
| 635 | if (inst->is15 == 1) |
| 636 | { |
| 637 | inst_len = SCORE16_INSTLEN; |
| 638 | |
| 639 | if (G_FLD (inst->v, 14, 12) == 0x2 |
| 640 | && G_FLD (inst->v, 3, 0) == 0xe) |
| 641 | { |
| 642 | /* push! */ |
| 643 | sp_offset += 4; |
| 644 | |
| 645 | if (G_FLD (inst->v, 11, 7) == 0x6 |
| 646 | && ra_offset_p == 0) |
| 647 | { |
| 648 | /* push! r3, [r0] */ |
| 649 | ra_offset = sp_offset; |
| 650 | ra_offset_p = 1; |
| 651 | } |
| 652 | else if (G_FLD (inst->v, 11, 7) == 0x4 |
| 653 | && fp_offset_p == 0) |
| 654 | { |
| 655 | /* push! r2, [r0] */ |
| 656 | fp_offset = sp_offset; |
| 657 | fp_offset_p = 1; |
| 658 | } |
| 659 | } |
| 660 | else if (G_FLD (inst->v, 14, 12) == 0x2 |
| 661 | && G_FLD (inst->v, 3, 0) == 0xa) |
| 662 | { |
| 663 | /* pop! */ |
| 664 | sp_offset -= 4; |
| 665 | } |
| 666 | else if (G_FLD (inst->v, 14, 7) == 0xc1 |
| 667 | && G_FLD (inst->v, 2, 0) == 0x0) |
| 668 | { |
| 669 | /* subei! r0, n */ |
| 670 | sp_offset += (int) pow (2, G_FLD (inst->v, 6, 3)); |
| 671 | } |
| 672 | else if (G_FLD (inst->v, 14, 7) == 0xc0 |
| 673 | && G_FLD (inst->v, 2, 0) == 0x0) |
| 674 | { |
| 675 | /* addei! r0, n */ |
| 676 | sp_offset -= (int) pow (2, G_FLD (inst->v, 6, 3)); |
| 677 | } |
| 678 | } |
| 679 | else |
| 680 | { |
| 681 | inst_len = SCORE_INSTLEN; |
| 682 | |
| 683 | if (G_FLD (inst->v, 29, 15) == 0xc60 |
| 684 | && G_FLD (inst->v, 2, 0) == 0x4) |
| 685 | { |
| 686 | /* sw r3, [r0, offset]+ */ |
| 687 | sp_offset += SCORE_INSTLEN; |
| 688 | if (ra_offset_p == 0) |
| 689 | { |
| 690 | ra_offset = sp_offset; |
| 691 | ra_offset_p = 1; |
| 692 | } |
| 693 | } |
| 694 | if (G_FLD (inst->v, 29, 15) == 0xc40 |
| 695 | && G_FLD (inst->v, 2, 0) == 0x4) |
| 696 | { |
| 697 | /* sw r2, [r0, offset]+ */ |
| 698 | sp_offset += SCORE_INSTLEN; |
| 699 | if (fp_offset_p == 0) |
| 700 | { |
| 701 | fp_offset = sp_offset; |
| 702 | fp_offset_p = 1; |
| 703 | } |
| 704 | } |
| 705 | else if (G_FLD (inst->v, 29, 15) == 0x1c60 |
| 706 | && G_FLD (inst->v, 2, 0) == 0x0) |
| 707 | { |
| 708 | /* lw r3, [r0]+, 4 */ |
| 709 | sp_offset -= SCORE_INSTLEN; |
| 710 | ra_offset_p = 1; |
| 711 | } |
| 712 | else if (G_FLD (inst->v, 29, 15) == 0x1c40 |
| 713 | && G_FLD (inst->v, 2, 0) == 0x0) |
| 714 | { |
| 715 | /* lw r2, [r0]+, 4 */ |
| 716 | sp_offset -= SCORE_INSTLEN; |
| 717 | fp_offset_p = 1; |
| 718 | } |
| 719 | |
| 720 | else if (G_FLD (inst->v, 29, 17) == 0x100 |
| 721 | && G_FLD (inst->v, 0, 0) == 0x0) |
| 722 | { |
| 723 | /* addi r0, -offset */ |
| 724 | sp_offset += 65536 - G_FLD (inst->v, 16, 1); |
| 725 | } |
| 726 | else if (G_FLD (inst->v, 29, 17) == 0x110 |
| 727 | && G_FLD (inst->v, 0, 0) == 0x0) |
| 728 | { |
| 729 | /* addi r2, offset */ |
| 730 | if (pc - cur_pc > 4) |
| 731 | { |
| 732 | unsigned int save_v = inst->v; |
| 733 | inst_t *inst2 = |
| 734 | score_fetch_instruction (cur_pc + SCORE_INSTLEN); |
| 735 | if (inst2->v == 0x23) |
| 736 | /* mv! r0, r2 */ |
| 737 | sp_offset -= G_FLD (save_v, 16, 1); |
| 738 | } |
| 739 | } |
| 740 | } |
| 741 | } |
| 742 | |
| 743 | /* Save RA. */ |
| 744 | if (ra_offset_p == 1) |
| 745 | { |
| 746 | if (this_cache->saved_regs[SCORE_PC_REGNUM].addr == -1) |
| 747 | this_cache->saved_regs[SCORE_PC_REGNUM].addr = |
| 748 | sp + sp_offset - ra_offset; |
| 749 | } |
| 750 | else |
| 751 | { |
| 752 | this_cache->saved_regs[SCORE_PC_REGNUM] = |
| 753 | this_cache->saved_regs[SCORE_RA_REGNUM]; |
| 754 | } |
| 755 | |
| 756 | /* Save FP. */ |
| 757 | if (fp_offset_p == 1) |
| 758 | { |
| 759 | if (this_cache->saved_regs[SCORE_FP_REGNUM].addr == -1) |
| 760 | this_cache->saved_regs[SCORE_FP_REGNUM].addr = |
| 761 | sp + sp_offset - fp_offset; |
| 762 | } |
| 763 | |
| 764 | /* Save SP. */ |
| 765 | this_cache->base = |
| 766 | frame_unwind_register_unsigned (next_frame, SCORE_SP_REGNUM) + sp_offset; |
| 767 | } |
| 768 | |
| 769 | static struct score_frame_cache * |
| 770 | score_make_prologue_cache (struct frame_info *next_frame, void **this_cache) |
| 771 | { |
| 772 | struct score_frame_cache *cache; |
| 773 | |
| 774 | if ((*this_cache) != NULL) |
| 775 | return (*this_cache); |
| 776 | |
| 777 | cache = FRAME_OBSTACK_ZALLOC (struct score_frame_cache); |
| 778 | (*this_cache) = cache; |
| 779 | cache->saved_regs = trad_frame_alloc_saved_regs (next_frame); |
| 780 | |
| 781 | /* Analyze the prologue. */ |
| 782 | { |
| 783 | const CORE_ADDR pc = frame_pc_unwind (next_frame); |
| 784 | CORE_ADDR start_addr; |
| 785 | |
| 786 | find_pc_partial_function (pc, NULL, &start_addr, NULL); |
| 787 | if (start_addr == 0) |
| 788 | return cache; |
| 789 | score_analyze_prologue (start_addr, pc, next_frame, *this_cache); |
| 790 | } |
| 791 | |
| 792 | /* Save SP. */ |
| 793 | trad_frame_set_value (cache->saved_regs, SCORE_SP_REGNUM, cache->base); |
| 794 | |
| 795 | return (*this_cache); |
| 796 | } |
| 797 | |
| 798 | static void |
| 799 | score_prologue_this_id (struct frame_info *next_frame, void **this_cache, |
| 800 | struct frame_id *this_id) |
| 801 | { |
| 802 | struct score_frame_cache *info = score_make_prologue_cache (next_frame, |
| 803 | this_cache); |
| 804 | (*this_id) = frame_id_build (info->base, |
| 805 | frame_func_unwind (next_frame, NORMAL_FRAME)); |
| 806 | } |
| 807 | |
| 808 | static void |
| 809 | score_prologue_prev_register (struct frame_info *next_frame, |
| 810 | void **this_cache, |
| 811 | int regnum, int *optimizedp, |
| 812 | enum lval_type *lvalp, CORE_ADDR * addrp, |
| 813 | int *realnump, gdb_byte * valuep) |
| 814 | { |
| 815 | struct score_frame_cache *info = score_make_prologue_cache (next_frame, |
| 816 | this_cache); |
| 817 | trad_frame_get_prev_register (next_frame, info->saved_regs, regnum, |
| 818 | optimizedp, lvalp, addrp, realnump, valuep); |
| 819 | } |
| 820 | |
| 821 | static const struct frame_unwind score_prologue_unwind = |
| 822 | { |
| 823 | NORMAL_FRAME, |
| 824 | score_prologue_this_id, |
| 825 | score_prologue_prev_register |
| 826 | }; |
| 827 | |
| 828 | static const struct frame_unwind * |
| 829 | score_prologue_sniffer (struct frame_info *next_frame) |
| 830 | { |
| 831 | return &score_prologue_unwind; |
| 832 | } |
| 833 | |
| 834 | static CORE_ADDR |
| 835 | score_prologue_frame_base_address (struct frame_info *next_frame, |
| 836 | void **this_cache) |
| 837 | { |
| 838 | struct score_frame_cache *info = |
| 839 | score_make_prologue_cache (next_frame, this_cache); |
| 840 | return info->base; |
| 841 | } |
| 842 | |
| 843 | static const struct frame_base score_prologue_frame_base = |
| 844 | { |
| 845 | &score_prologue_unwind, |
| 846 | score_prologue_frame_base_address, |
| 847 | score_prologue_frame_base_address, |
| 848 | score_prologue_frame_base_address, |
| 849 | }; |
| 850 | |
| 851 | static const struct frame_base * |
| 852 | score_prologue_frame_base_sniffer (struct frame_info *next_frame) |
| 853 | { |
| 854 | return &score_prologue_frame_base; |
| 855 | } |
| 856 | |
| 857 | static struct gdbarch * |
| 858 | score_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 859 | { |
| 860 | struct gdbarch *gdbarch; |
| 861 | |
| 862 | arches = gdbarch_list_lookup_by_info (arches, &info); |
| 863 | if (arches != NULL) |
| 864 | { |
| 865 | return (arches->gdbarch); |
| 866 | } |
| 867 | gdbarch = gdbarch_alloc (&info, 0); |
| 868 | |
| 869 | set_gdbarch_short_bit (gdbarch, 16); |
| 870 | set_gdbarch_int_bit (gdbarch, 32); |
| 871 | set_gdbarch_float_bit (gdbarch, 32); |
| 872 | set_gdbarch_double_bit (gdbarch, 64); |
| 873 | set_gdbarch_long_double_bit (gdbarch, 64); |
| 874 | set_gdbarch_register_sim_regno (gdbarch, score_register_sim_regno); |
| 875 | set_gdbarch_pc_regnum (gdbarch, SCORE_PC_REGNUM); |
| 876 | set_gdbarch_sp_regnum (gdbarch, SCORE_SP_REGNUM); |
| 877 | set_gdbarch_num_regs (gdbarch, SCORE_NUM_REGS); |
| 878 | set_gdbarch_register_name (gdbarch, score_register_name); |
| 879 | set_gdbarch_breakpoint_from_pc (gdbarch, score_breakpoint_from_pc); |
| 880 | set_gdbarch_register_type (gdbarch, score_register_type); |
| 881 | set_gdbarch_frame_align (gdbarch, score_frame_align); |
| 882 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 883 | set_gdbarch_read_sp (gdbarch, score_read_sp); |
| 884 | set_gdbarch_unwind_pc (gdbarch, score_unwind_pc); |
| 885 | set_gdbarch_print_insn (gdbarch, score_print_insn); |
| 886 | set_gdbarch_skip_prologue (gdbarch, score_skip_prologue); |
| 887 | set_gdbarch_in_function_epilogue_p (gdbarch, score_in_function_epilogue_p); |
| 888 | set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT); |
| 889 | set_gdbarch_return_value (gdbarch, score_return_value); |
| 890 | set_gdbarch_unwind_dummy_id (gdbarch, score_unwind_dummy_id); |
| 891 | set_gdbarch_push_dummy_call (gdbarch, score_push_dummy_call); |
| 892 | |
| 893 | frame_unwind_append_sniffer (gdbarch, dwarf2_frame_sniffer); |
| 894 | frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer); |
| 895 | frame_unwind_append_sniffer (gdbarch, score_prologue_sniffer); |
| 896 | frame_base_append_sniffer (gdbarch, score_prologue_frame_base_sniffer); |
| 897 | |
| 898 | return gdbarch; |
| 899 | } |
| 900 | |
| 901 | extern initialize_file_ftype _initialize_score_tdep; |
| 902 | |
| 903 | void |
| 904 | _initialize_score_tdep (void) |
| 905 | { |
| 906 | gdbarch_register (bfd_arch_score, score_gdbarch_init, NULL); |
| 907 | } |