| 1 | /* Target-dependent code for the S+core architecture, for GDB, |
| 2 | the GNU Debugger. |
| 3 | |
| 4 | Copyright (C) 2006-2020 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 successfully 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 (2.0, 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 | /* Solaris 11+gcc 5.5 has ambiguous overloads of pow, so we |
| 928 | pass 2.0 instead of 2 to get the right one. */ |
| 929 | sp_offset -= (int) pow (2.0, G_FLD (inst->v, 6, 3)); |
| 930 | } |
| 931 | } |
| 932 | else |
| 933 | { |
| 934 | inst_len = SCORE_INSTLEN; |
| 935 | |
| 936 | if (G_FLD(inst->v, 29, 25) == 0x3 |
| 937 | && G_FLD(inst->v, 2, 0) == 0x4 |
| 938 | && G_FLD(inst->v, 19, 15) == 0) |
| 939 | { |
| 940 | /* sw rD, [r0, offset]+ */ |
| 941 | sp_offset += SCORE_INSTLEN; |
| 942 | |
| 943 | if (G_FLD(inst->v, 24, 20) == 0x3) |
| 944 | { |
| 945 | /* rD = r3 */ |
| 946 | if (ra_offset_p == 0) |
| 947 | { |
| 948 | ra_offset = sp_offset; |
| 949 | ra_offset_p = 1; |
| 950 | } |
| 951 | } |
| 952 | else if (G_FLD(inst->v, 24, 20) == 0x2) |
| 953 | { |
| 954 | /* rD = r2 */ |
| 955 | if (fp_offset_p == 0) |
| 956 | { |
| 957 | fp_offset = sp_offset; |
| 958 | fp_offset_p = 1; |
| 959 | } |
| 960 | } |
| 961 | } |
| 962 | else if (G_FLD(inst->v, 29, 25) == 0x14 |
| 963 | && G_FLD(inst->v, 19,15) == 0) |
| 964 | { |
| 965 | /* sw rD, [r0, offset] */ |
| 966 | if (G_FLD(inst->v, 24, 20) == 0x3) |
| 967 | { |
| 968 | /* rD = r3 */ |
| 969 | ra_offset = sp_offset - G_FLD(inst->v, 14, 0); |
| 970 | ra_offset_p = 1; |
| 971 | } |
| 972 | else if (G_FLD(inst->v, 24, 20) == 0x2) |
| 973 | { |
| 974 | /* rD = r2 */ |
| 975 | fp_offset = sp_offset - G_FLD(inst->v, 14, 0); |
| 976 | fp_offset_p = 1; |
| 977 | } |
| 978 | } |
| 979 | else if (G_FLD (inst->v, 29, 15) == 0x1c60 |
| 980 | && G_FLD (inst->v, 2, 0) == 0x0) |
| 981 | { |
| 982 | /* lw r3, [r0]+, 4 */ |
| 983 | sp_offset -= SCORE_INSTLEN; |
| 984 | ra_offset_p = 1; |
| 985 | } |
| 986 | else if (G_FLD (inst->v, 29, 15) == 0x1c40 |
| 987 | && G_FLD (inst->v, 2, 0) == 0x0) |
| 988 | { |
| 989 | /* lw r2, [r0]+, 4 */ |
| 990 | sp_offset -= SCORE_INSTLEN; |
| 991 | fp_offset_p = 1; |
| 992 | } |
| 993 | |
| 994 | else if (G_FLD (inst->v, 29, 17) == 0x100 |
| 995 | && G_FLD (inst->v, 0, 0) == 0x0) |
| 996 | { |
| 997 | /* addi r0, -offset */ |
| 998 | sp_offset += 65536 - G_FLD (inst->v, 16, 1); |
| 999 | } |
| 1000 | else if (G_FLD (inst->v, 29, 17) == 0x110 |
| 1001 | && G_FLD (inst->v, 0, 0) == 0x0) |
| 1002 | { |
| 1003 | /* addi r2, offset */ |
| 1004 | if (pc - cur_pc > 4) |
| 1005 | { |
| 1006 | unsigned int save_v = inst->v; |
| 1007 | inst_t *inst2 = |
| 1008 | score7_fetch_inst (gdbarch, cur_pc + SCORE_INSTLEN, NULL); |
| 1009 | if (inst2->v == 0x23) |
| 1010 | { |
| 1011 | /* mv! r0, r2 */ |
| 1012 | sp_offset -= G_FLD (save_v, 16, 1); |
| 1013 | } |
| 1014 | } |
| 1015 | } |
| 1016 | } |
| 1017 | } |
| 1018 | |
| 1019 | /* Save RA. */ |
| 1020 | if (ra_offset_p == 1) |
| 1021 | { |
| 1022 | if (this_cache->saved_regs[SCORE_PC_REGNUM].addr == -1) |
| 1023 | this_cache->saved_regs[SCORE_PC_REGNUM].addr = |
| 1024 | sp + sp_offset - ra_offset; |
| 1025 | } |
| 1026 | else |
| 1027 | { |
| 1028 | this_cache->saved_regs[SCORE_PC_REGNUM] = |
| 1029 | this_cache->saved_regs[SCORE_RA_REGNUM]; |
| 1030 | } |
| 1031 | |
| 1032 | /* Save FP. */ |
| 1033 | if (fp_offset_p == 1) |
| 1034 | { |
| 1035 | if (this_cache->saved_regs[SCORE_FP_REGNUM].addr == -1) |
| 1036 | this_cache->saved_regs[SCORE_FP_REGNUM].addr = |
| 1037 | sp + sp_offset - fp_offset; |
| 1038 | } |
| 1039 | |
| 1040 | /* Save SP and FP. */ |
| 1041 | this_cache->base = sp + sp_offset; |
| 1042 | this_cache->fp = fp; |
| 1043 | |
| 1044 | /* Don't forget to free MEMBLOCK if we allocated it. */ |
| 1045 | if (memblock_ptr != NULL) |
| 1046 | score7_free_memblock (memblock_ptr); |
| 1047 | } |
| 1048 | |
| 1049 | static void |
| 1050 | score3_analyze_prologue (CORE_ADDR startaddr, CORE_ADDR pc, |
| 1051 | struct frame_info *this_frame, |
| 1052 | struct score_frame_cache *this_cache) |
| 1053 | { |
| 1054 | CORE_ADDR sp; |
| 1055 | CORE_ADDR fp; |
| 1056 | CORE_ADDR cur_pc = startaddr; |
| 1057 | enum bfd_endian byte_order |
| 1058 | = gdbarch_byte_order (get_frame_arch (this_frame)); |
| 1059 | |
| 1060 | int sp_offset = 0; |
| 1061 | int ra_offset = 0; |
| 1062 | int fp_offset = 0; |
| 1063 | int ra_offset_p = 0; |
| 1064 | int fp_offset_p = 0; |
| 1065 | int inst_len = 0; |
| 1066 | |
| 1067 | sp = get_frame_register_unsigned (this_frame, SCORE_SP_REGNUM); |
| 1068 | fp = get_frame_register_unsigned (this_frame, SCORE_FP_REGNUM); |
| 1069 | |
| 1070 | for (; cur_pc < pc; cur_pc += inst_len) |
| 1071 | { |
| 1072 | inst_t *inst = NULL; |
| 1073 | |
| 1074 | inst = score3_adjust_pc_and_fetch_inst (&cur_pc, &inst_len, byte_order); |
| 1075 | |
| 1076 | /* FIXME: make a full-power prologue analyzer. */ |
| 1077 | if (inst->len == 2) |
| 1078 | { |
| 1079 | if (G_FLD (inst->v, 14, 12) == 0x0 |
| 1080 | && G_FLD (inst->v, 11, 7) == 0x0 |
| 1081 | && G_FLD (inst->v, 6, 5) == 0x3) |
| 1082 | { |
| 1083 | /* push! */ |
| 1084 | sp_offset += 4; |
| 1085 | |
| 1086 | if (G_FLD (inst->v, 4, 0) == 0x3 |
| 1087 | && ra_offset_p == 0) |
| 1088 | { |
| 1089 | /* push! r3, [r0] */ |
| 1090 | ra_offset = sp_offset; |
| 1091 | ra_offset_p = 1; |
| 1092 | } |
| 1093 | else if (G_FLD (inst->v, 4, 0) == 0x2 |
| 1094 | && fp_offset_p == 0) |
| 1095 | { |
| 1096 | /* push! r2, [r0] */ |
| 1097 | fp_offset = sp_offset; |
| 1098 | fp_offset_p = 1; |
| 1099 | } |
| 1100 | } |
| 1101 | else if (G_FLD (inst->v, 14, 12) == 0x6 |
| 1102 | && G_FLD (inst->v, 11, 10) == 0x3) |
| 1103 | { |
| 1104 | /* rpush! */ |
| 1105 | int start_r = G_FLD (inst->v, 9, 5); |
| 1106 | int cnt = G_FLD (inst->v, 4, 0); |
| 1107 | |
| 1108 | if ((ra_offset_p == 0) |
| 1109 | && (start_r <= SCORE_RA_REGNUM) |
| 1110 | && (SCORE_RA_REGNUM < start_r + cnt)) |
| 1111 | { |
| 1112 | /* rpush! contains r3 */ |
| 1113 | ra_offset_p = 1; |
| 1114 | ra_offset = sp_offset + 4 * (SCORE_RA_REGNUM - start_r) + 4; |
| 1115 | } |
| 1116 | |
| 1117 | if ((fp_offset_p == 0) |
| 1118 | && (start_r <= SCORE_FP_REGNUM) |
| 1119 | && (SCORE_FP_REGNUM < start_r + cnt)) |
| 1120 | { |
| 1121 | /* rpush! contains r2 */ |
| 1122 | fp_offset_p = 1; |
| 1123 | fp_offset = sp_offset + 4 * (SCORE_FP_REGNUM - start_r) + 4; |
| 1124 | } |
| 1125 | |
| 1126 | sp_offset += 4 * cnt; |
| 1127 | } |
| 1128 | else if (G_FLD (inst->v, 14, 12) == 0x0 |
| 1129 | && G_FLD (inst->v, 11, 7) == 0x0 |
| 1130 | && G_FLD (inst->v, 6, 5) == 0x2) |
| 1131 | { |
| 1132 | /* pop! */ |
| 1133 | sp_offset -= 4; |
| 1134 | } |
| 1135 | else if (G_FLD (inst->v, 14, 12) == 0x6 |
| 1136 | && G_FLD (inst->v, 11, 10) == 0x2) |
| 1137 | { |
| 1138 | /* rpop! */ |
| 1139 | sp_offset -= 4 * G_FLD (inst->v, 4, 0); |
| 1140 | } |
| 1141 | else if (G_FLD (inst->v, 14, 12) == 0x5 |
| 1142 | && G_FLD (inst->v, 11, 10) == 0x3 |
| 1143 | && G_FLD (inst->v, 9, 6) == 0x0) |
| 1144 | { |
| 1145 | /* addi! r0, -offset */ |
| 1146 | int imm = G_FLD (inst->v, 5, 0); |
| 1147 | if (imm >> 5) |
| 1148 | imm = -(0x3F - imm + 1); |
| 1149 | sp_offset -= imm; |
| 1150 | } |
| 1151 | else if (G_FLD (inst->v, 14, 12) == 0x5 |
| 1152 | && G_FLD (inst->v, 11, 10) == 0x3 |
| 1153 | && G_FLD (inst->v, 9, 6) == 0x2) |
| 1154 | { |
| 1155 | /* addi! r2, offset */ |
| 1156 | if (pc - cur_pc >= 2) |
| 1157 | { |
| 1158 | inst_t *inst2; |
| 1159 | |
| 1160 | cur_pc += inst->len; |
| 1161 | inst2 = score3_adjust_pc_and_fetch_inst (&cur_pc, NULL, |
| 1162 | byte_order); |
| 1163 | |
| 1164 | if (inst2->len == 2 |
| 1165 | && G_FLD (inst2->v, 14, 10) == 0x10 |
| 1166 | && G_FLD (inst2->v, 9, 5) == 0x0 |
| 1167 | && G_FLD (inst2->v, 4, 0) == 0x2) |
| 1168 | { |
| 1169 | /* mv! r0, r2 */ |
| 1170 | int imm = G_FLD (inst->v, 5, 0); |
| 1171 | if (imm >> 5) |
| 1172 | imm = -(0x3F - imm + 1); |
| 1173 | sp_offset -= imm; |
| 1174 | } |
| 1175 | } |
| 1176 | } |
| 1177 | } |
| 1178 | else if (inst->len == 4) |
| 1179 | { |
| 1180 | if (G_FLD (inst->v, 29, 25) == 0x3 |
| 1181 | && G_FLD (inst->v, 2, 0) == 0x4 |
| 1182 | && G_FLD (inst->v, 24, 20) == 0x3 |
| 1183 | && G_FLD (inst->v, 19, 15) == 0x0) |
| 1184 | { |
| 1185 | /* sw r3, [r0, offset]+ */ |
| 1186 | sp_offset += inst->len; |
| 1187 | if (ra_offset_p == 0) |
| 1188 | { |
| 1189 | ra_offset = sp_offset; |
| 1190 | ra_offset_p = 1; |
| 1191 | } |
| 1192 | } |
| 1193 | else if (G_FLD (inst->v, 29, 25) == 0x3 |
| 1194 | && G_FLD (inst->v, 2, 0) == 0x4 |
| 1195 | && G_FLD (inst->v, 24, 20) == 0x2 |
| 1196 | && G_FLD (inst->v, 19, 15) == 0x0) |
| 1197 | { |
| 1198 | /* sw r2, [r0, offset]+ */ |
| 1199 | sp_offset += inst->len; |
| 1200 | if (fp_offset_p == 0) |
| 1201 | { |
| 1202 | fp_offset = sp_offset; |
| 1203 | fp_offset_p = 1; |
| 1204 | } |
| 1205 | } |
| 1206 | else if (G_FLD (inst->v, 29, 25) == 0x7 |
| 1207 | && G_FLD (inst->v, 2, 0) == 0x0 |
| 1208 | && G_FLD (inst->v, 24, 20) == 0x3 |
| 1209 | && G_FLD (inst->v, 19, 15) == 0x0) |
| 1210 | { |
| 1211 | /* lw r3, [r0]+, 4 */ |
| 1212 | sp_offset -= inst->len; |
| 1213 | ra_offset_p = 1; |
| 1214 | } |
| 1215 | else if (G_FLD (inst->v, 29, 25) == 0x7 |
| 1216 | && G_FLD (inst->v, 2, 0) == 0x0 |
| 1217 | && G_FLD (inst->v, 24, 20) == 0x2 |
| 1218 | && G_FLD (inst->v, 19, 15) == 0x0) |
| 1219 | { |
| 1220 | /* lw r2, [r0]+, 4 */ |
| 1221 | sp_offset -= inst->len; |
| 1222 | fp_offset_p = 1; |
| 1223 | } |
| 1224 | else if (G_FLD (inst->v, 29, 25) == 0x1 |
| 1225 | && G_FLD (inst->v, 19, 17) == 0x0 |
| 1226 | && G_FLD (inst->v, 24, 20) == 0x0 |
| 1227 | && G_FLD (inst->v, 0, 0) == 0x0) |
| 1228 | { |
| 1229 | /* addi r0, -offset */ |
| 1230 | int imm = G_FLD (inst->v, 16, 1); |
| 1231 | if (imm >> 15) |
| 1232 | imm = -(0xFFFF - imm + 1); |
| 1233 | sp_offset -= imm; |
| 1234 | } |
| 1235 | else if (G_FLD (inst->v, 29, 25) == 0x1 |
| 1236 | && G_FLD (inst->v, 19, 17) == 0x0 |
| 1237 | && G_FLD (inst->v, 24, 20) == 0x2 |
| 1238 | && G_FLD (inst->v, 0, 0) == 0x0) |
| 1239 | { |
| 1240 | /* addi r2, offset */ |
| 1241 | if (pc - cur_pc >= 2) |
| 1242 | { |
| 1243 | inst_t *inst2; |
| 1244 | |
| 1245 | cur_pc += inst->len; |
| 1246 | inst2 = score3_adjust_pc_and_fetch_inst (&cur_pc, NULL, |
| 1247 | byte_order); |
| 1248 | |
| 1249 | if (inst2->len == 2 |
| 1250 | && G_FLD (inst2->v, 14, 10) == 0x10 |
| 1251 | && G_FLD (inst2->v, 9, 5) == 0x0 |
| 1252 | && G_FLD (inst2->v, 4, 0) == 0x2) |
| 1253 | { |
| 1254 | /* mv! r0, r2 */ |
| 1255 | int imm = G_FLD (inst->v, 16, 1); |
| 1256 | if (imm >> 15) |
| 1257 | imm = -(0xFFFF - imm + 1); |
| 1258 | sp_offset -= imm; |
| 1259 | } |
| 1260 | } |
| 1261 | } |
| 1262 | } |
| 1263 | } |
| 1264 | |
| 1265 | /* Save RA. */ |
| 1266 | if (ra_offset_p == 1) |
| 1267 | { |
| 1268 | if (this_cache->saved_regs[SCORE_PC_REGNUM].addr == -1) |
| 1269 | this_cache->saved_regs[SCORE_PC_REGNUM].addr = |
| 1270 | sp + sp_offset - ra_offset; |
| 1271 | } |
| 1272 | else |
| 1273 | { |
| 1274 | this_cache->saved_regs[SCORE_PC_REGNUM] = |
| 1275 | this_cache->saved_regs[SCORE_RA_REGNUM]; |
| 1276 | } |
| 1277 | |
| 1278 | /* Save FP. */ |
| 1279 | if (fp_offset_p == 1) |
| 1280 | { |
| 1281 | if (this_cache->saved_regs[SCORE_FP_REGNUM].addr == -1) |
| 1282 | this_cache->saved_regs[SCORE_FP_REGNUM].addr = |
| 1283 | sp + sp_offset - fp_offset; |
| 1284 | } |
| 1285 | |
| 1286 | /* Save SP and FP. */ |
| 1287 | this_cache->base = sp + sp_offset; |
| 1288 | this_cache->fp = fp; |
| 1289 | } |
| 1290 | |
| 1291 | static struct score_frame_cache * |
| 1292 | score_make_prologue_cache (struct frame_info *this_frame, void **this_cache) |
| 1293 | { |
| 1294 | struct score_frame_cache *cache; |
| 1295 | |
| 1296 | if ((*this_cache) != NULL) |
| 1297 | return (struct score_frame_cache *) (*this_cache); |
| 1298 | |
| 1299 | cache = FRAME_OBSTACK_ZALLOC (struct score_frame_cache); |
| 1300 | (*this_cache) = cache; |
| 1301 | cache->saved_regs = trad_frame_alloc_saved_regs (this_frame); |
| 1302 | |
| 1303 | /* Analyze the prologue. */ |
| 1304 | { |
| 1305 | const CORE_ADDR pc = get_frame_pc (this_frame); |
| 1306 | CORE_ADDR start_addr; |
| 1307 | |
| 1308 | find_pc_partial_function (pc, NULL, &start_addr, NULL); |
| 1309 | if (start_addr == 0) |
| 1310 | return cache; |
| 1311 | |
| 1312 | if (target_mach == bfd_mach_score3) |
| 1313 | score3_analyze_prologue (start_addr, pc, this_frame, |
| 1314 | (struct score_frame_cache *) *this_cache); |
| 1315 | else |
| 1316 | score7_analyze_prologue (start_addr, pc, this_frame, |
| 1317 | (struct score_frame_cache *) *this_cache); |
| 1318 | } |
| 1319 | |
| 1320 | /* Save SP. */ |
| 1321 | trad_frame_set_value (cache->saved_regs, SCORE_SP_REGNUM, cache->base); |
| 1322 | |
| 1323 | return (struct score_frame_cache *) (*this_cache); |
| 1324 | } |
| 1325 | |
| 1326 | static void |
| 1327 | score_prologue_this_id (struct frame_info *this_frame, void **this_cache, |
| 1328 | struct frame_id *this_id) |
| 1329 | { |
| 1330 | struct score_frame_cache *info = score_make_prologue_cache (this_frame, |
| 1331 | this_cache); |
| 1332 | (*this_id) = frame_id_build (info->base, get_frame_func (this_frame)); |
| 1333 | } |
| 1334 | |
| 1335 | static struct value * |
| 1336 | score_prologue_prev_register (struct frame_info *this_frame, |
| 1337 | void **this_cache, int regnum) |
| 1338 | { |
| 1339 | struct score_frame_cache *info = score_make_prologue_cache (this_frame, |
| 1340 | this_cache); |
| 1341 | return trad_frame_get_prev_register (this_frame, info->saved_regs, regnum); |
| 1342 | } |
| 1343 | |
| 1344 | static const struct frame_unwind score_prologue_unwind = |
| 1345 | { |
| 1346 | NORMAL_FRAME, |
| 1347 | default_frame_unwind_stop_reason, |
| 1348 | score_prologue_this_id, |
| 1349 | score_prologue_prev_register, |
| 1350 | NULL, |
| 1351 | default_frame_sniffer, |
| 1352 | NULL |
| 1353 | }; |
| 1354 | |
| 1355 | static CORE_ADDR |
| 1356 | score_prologue_frame_base_address (struct frame_info *this_frame, |
| 1357 | void **this_cache) |
| 1358 | { |
| 1359 | struct score_frame_cache *info = |
| 1360 | score_make_prologue_cache (this_frame, this_cache); |
| 1361 | return info->fp; |
| 1362 | } |
| 1363 | |
| 1364 | static const struct frame_base score_prologue_frame_base = |
| 1365 | { |
| 1366 | &score_prologue_unwind, |
| 1367 | score_prologue_frame_base_address, |
| 1368 | score_prologue_frame_base_address, |
| 1369 | score_prologue_frame_base_address, |
| 1370 | }; |
| 1371 | |
| 1372 | static const struct frame_base * |
| 1373 | score_prologue_frame_base_sniffer (struct frame_info *this_frame) |
| 1374 | { |
| 1375 | return &score_prologue_frame_base; |
| 1376 | } |
| 1377 | |
| 1378 | /* Core file support. */ |
| 1379 | |
| 1380 | static const struct regcache_map_entry score7_linux_gregmap[] = |
| 1381 | { |
| 1382 | /* FIXME: According to the current Linux kernel, r0 is preceded by |
| 1383 | 9 rather than 7 words. */ |
| 1384 | { 7, REGCACHE_MAP_SKIP, 4 }, |
| 1385 | { 32, 0, 4 }, /* r0 ... r31 */ |
| 1386 | { 1, 55, 4 }, /* CEL */ |
| 1387 | { 1, 54, 4 }, /* CEH */ |
| 1388 | { 1, 53, 4 }, /* sr0, i.e. cnt or COUNTER */ |
| 1389 | { 1, 52, 4 }, /* sr1, i.e. lcr or LDCR */ |
| 1390 | { 1, 51, 4 }, /* sr2, i.e. scr or STCR */ |
| 1391 | { 1, 49, 4 }, /* PC (same slot as EPC) */ |
| 1392 | { 1, 38, 4 }, /* EMA */ |
| 1393 | { 1, 32, 4 }, /* PSR */ |
| 1394 | { 1, 34, 4 }, /* ECR */ |
| 1395 | { 1, 33, 4 }, /* COND */ |
| 1396 | { 0 } |
| 1397 | }; |
| 1398 | |
| 1399 | #define SCORE7_LINUX_EPC_OFFSET (44 * 4) |
| 1400 | #define SCORE7_LINUX_SIZEOF_GREGSET (49 * 4) |
| 1401 | |
| 1402 | static void |
| 1403 | score7_linux_supply_gregset(const struct regset *regset, |
| 1404 | struct regcache *regcache, |
| 1405 | int regnum, const void *buf, |
| 1406 | size_t size) |
| 1407 | { |
| 1408 | regcache_supply_regset (regset, regcache, regnum, buf, size); |
| 1409 | |
| 1410 | /* Supply the EPC from the same slot as the PC. Note that the |
| 1411 | collect function will store the PC in that slot. */ |
| 1412 | if ((regnum == -1 || regnum == SCORE_EPC_REGNUM) |
| 1413 | && size >= SCORE7_LINUX_EPC_OFFSET + 4) |
| 1414 | regcache->raw_supply |
| 1415 | (SCORE_EPC_REGNUM, (const gdb_byte *) buf + SCORE7_LINUX_EPC_OFFSET); |
| 1416 | } |
| 1417 | |
| 1418 | static const struct regset score7_linux_gregset = |
| 1419 | { |
| 1420 | score7_linux_gregmap, |
| 1421 | score7_linux_supply_gregset, |
| 1422 | regcache_collect_regset |
| 1423 | }; |
| 1424 | |
| 1425 | /* Iterate over core file register note sections. */ |
| 1426 | |
| 1427 | static void |
| 1428 | score7_linux_iterate_over_regset_sections (struct gdbarch *gdbarch, |
| 1429 | iterate_over_regset_sections_cb *cb, |
| 1430 | void *cb_data, |
| 1431 | const struct regcache *regcache) |
| 1432 | { |
| 1433 | cb (".reg", SCORE7_LINUX_SIZEOF_GREGSET, SCORE7_LINUX_SIZEOF_GREGSET, |
| 1434 | &score7_linux_gregset, NULL, cb_data); |
| 1435 | } |
| 1436 | |
| 1437 | static struct gdbarch * |
| 1438 | score_gdbarch_init (struct gdbarch_info info, struct gdbarch_list *arches) |
| 1439 | { |
| 1440 | struct gdbarch *gdbarch; |
| 1441 | target_mach = info.bfd_arch_info->mach; |
| 1442 | |
| 1443 | arches = gdbarch_list_lookup_by_info (arches, &info); |
| 1444 | if (arches != NULL) |
| 1445 | { |
| 1446 | return (arches->gdbarch); |
| 1447 | } |
| 1448 | gdbarch = gdbarch_alloc (&info, NULL); |
| 1449 | |
| 1450 | set_gdbarch_short_bit (gdbarch, 16); |
| 1451 | set_gdbarch_int_bit (gdbarch, 32); |
| 1452 | set_gdbarch_float_bit (gdbarch, 32); |
| 1453 | set_gdbarch_double_bit (gdbarch, 64); |
| 1454 | set_gdbarch_long_double_bit (gdbarch, 64); |
| 1455 | #if WITH_SIM |
| 1456 | set_gdbarch_register_sim_regno (gdbarch, score_register_sim_regno); |
| 1457 | #endif |
| 1458 | set_gdbarch_pc_regnum (gdbarch, SCORE_PC_REGNUM); |
| 1459 | set_gdbarch_sp_regnum (gdbarch, SCORE_SP_REGNUM); |
| 1460 | set_gdbarch_adjust_breakpoint_address (gdbarch, |
| 1461 | score_adjust_breakpoint_address); |
| 1462 | set_gdbarch_register_type (gdbarch, score_register_type); |
| 1463 | set_gdbarch_frame_align (gdbarch, score_frame_align); |
| 1464 | set_gdbarch_inner_than (gdbarch, core_addr_lessthan); |
| 1465 | |
| 1466 | switch (target_mach) |
| 1467 | { |
| 1468 | case bfd_mach_score7: |
| 1469 | set_gdbarch_breakpoint_kind_from_pc (gdbarch, |
| 1470 | score7_breakpoint_kind_from_pc); |
| 1471 | set_gdbarch_sw_breakpoint_from_kind (gdbarch, |
| 1472 | score7_sw_breakpoint_from_kind); |
| 1473 | set_gdbarch_skip_prologue (gdbarch, score7_skip_prologue); |
| 1474 | set_gdbarch_stack_frame_destroyed_p (gdbarch, |
| 1475 | score7_stack_frame_destroyed_p); |
| 1476 | set_gdbarch_register_name (gdbarch, score7_register_name); |
| 1477 | set_gdbarch_num_regs (gdbarch, SCORE7_NUM_REGS); |
| 1478 | /* Core file support. */ |
| 1479 | set_gdbarch_iterate_over_regset_sections |
| 1480 | (gdbarch, score7_linux_iterate_over_regset_sections); |
| 1481 | break; |
| 1482 | |
| 1483 | case bfd_mach_score3: |
| 1484 | set_gdbarch_breakpoint_kind_from_pc (gdbarch, |
| 1485 | score3_breakpoint_kind_from_pc); |
| 1486 | set_gdbarch_sw_breakpoint_from_kind (gdbarch, |
| 1487 | score3_sw_breakpoint_from_kind); |
| 1488 | set_gdbarch_skip_prologue (gdbarch, score3_skip_prologue); |
| 1489 | set_gdbarch_stack_frame_destroyed_p (gdbarch, |
| 1490 | score3_stack_frame_destroyed_p); |
| 1491 | set_gdbarch_register_name (gdbarch, score3_register_name); |
| 1492 | set_gdbarch_num_regs (gdbarch, SCORE3_NUM_REGS); |
| 1493 | break; |
| 1494 | } |
| 1495 | |
| 1496 | /* Watchpoint hooks. */ |
| 1497 | set_gdbarch_have_nonsteppable_watchpoint (gdbarch, 1); |
| 1498 | |
| 1499 | /* Dummy frame hooks. */ |
| 1500 | set_gdbarch_return_value (gdbarch, score_return_value); |
| 1501 | set_gdbarch_call_dummy_location (gdbarch, AT_ENTRY_POINT); |
| 1502 | set_gdbarch_push_dummy_call (gdbarch, score_push_dummy_call); |
| 1503 | |
| 1504 | /* Normal frame hooks. */ |
| 1505 | dwarf2_append_unwinders (gdbarch); |
| 1506 | frame_base_append_sniffer (gdbarch, dwarf2_frame_base_sniffer); |
| 1507 | frame_unwind_append_unwinder (gdbarch, &score_prologue_unwind); |
| 1508 | frame_base_append_sniffer (gdbarch, score_prologue_frame_base_sniffer); |
| 1509 | |
| 1510 | return gdbarch; |
| 1511 | } |
| 1512 | |
| 1513 | void |
| 1514 | _initialize_score_tdep (void) |
| 1515 | { |
| 1516 | gdbarch_register (bfd_arch_score, score_gdbarch_init, NULL); |
| 1517 | } |