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| 1 /* gdb-if.c -- sim interface to GDB. |
| 2 |
| 3 Copyright (C) 2011-2012 Free Software Foundation, Inc. |
| 4 Contributed by Red Hat, Inc. |
| 5 |
| 6 This file is part of the GNU simulators. |
| 7 |
| 8 This program is free software; you can redistribute it and/or modify |
| 9 it under the terms of the GNU General Public License as published by |
| 10 the Free Software Foundation; either version 3 of the License, or |
| 11 (at your option) any later version. |
| 12 |
| 13 This program is distributed in the hope that it will be useful, |
| 14 but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 16 GNU General Public License for more details. |
| 17 |
| 18 You should have received a copy of the GNU General Public License |
| 19 along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
| 20 |
| 21 #include "config.h" |
| 22 #include <stdio.h> |
| 23 #include <assert.h> |
| 24 #include <signal.h> |
| 25 #include <string.h> |
| 26 #include <ctype.h> |
| 27 #include <stdlib.h> |
| 28 |
| 29 #include "ansidecl.h" |
| 30 #include "gdb/callback.h" |
| 31 #include "gdb/remote-sim.h" |
| 32 #include "gdb/signals.h" |
| 33 #include "gdb/sim-rl78.h" |
| 34 |
| 35 #include "cpu.h" |
| 36 #include "mem.h" |
| 37 #include "load.h" |
| 38 #include "trace.h" |
| 39 |
| 40 /* Ideally, we'd wrap up all the minisim's data structures in an |
| 41 object and pass that around. However, neither GDB nor run needs |
| 42 that ability. |
| 43 |
| 44 So we just have one instance, that lives in global variables, and |
| 45 each time we open it, we re-initialize it. */ |
| 46 |
| 47 struct sim_state |
| 48 { |
| 49 const char *message; |
| 50 }; |
| 51 |
| 52 static struct sim_state the_minisim = { |
| 53 "This is the sole rl78 minisim instance." |
| 54 }; |
| 55 |
| 56 static int open; |
| 57 |
| 58 static unsigned char hw_breakpoints[MEM_SIZE/8]; |
| 59 |
| 60 static struct host_callback_struct *host_callbacks; |
| 61 |
| 62 /* Open an instance of the sim. For this sim, only one instance |
| 63 is permitted. If sim_open() is called multiple times, the sim |
| 64 will be reset. */ |
| 65 |
| 66 SIM_DESC |
| 67 sim_open (SIM_OPEN_KIND kind, |
| 68 struct host_callback_struct *callback, |
| 69 struct bfd *abfd, char **argv) |
| 70 { |
| 71 if (open) |
| 72 fprintf (stderr, "rl78 minisim: re-opened sim\n"); |
| 73 |
| 74 /* The 'run' interface doesn't use this function, so we don't care |
| 75 about KIND; it's always SIM_OPEN_DEBUG. */ |
| 76 if (kind != SIM_OPEN_DEBUG) |
| 77 fprintf (stderr, "rl78 minisim: sim_open KIND != SIM_OPEN_DEBUG: %d\n", |
| 78 kind); |
| 79 |
| 80 /* We use this for the load command. Perhaps someday, it'll be used |
| 81 for syscalls too. */ |
| 82 host_callbacks = callback; |
| 83 |
| 84 /* We don't expect any command-line arguments. */ |
| 85 |
| 86 init_cpu (); |
| 87 trace = 0; |
| 88 |
| 89 sim_disasm_init (abfd); |
| 90 open = 1; |
| 91 return &the_minisim; |
| 92 } |
| 93 |
| 94 /* Verify the sim descriptor. Just print a message if the descriptor |
| 95 doesn't match. Nothing bad will happen if the descriptor doesn't |
| 96 match because all of the state is global. But if it doesn't |
| 97 match, that means there's a problem with the caller. */ |
| 98 |
| 99 static void |
| 100 check_desc (SIM_DESC sd) |
| 101 { |
| 102 if (sd != &the_minisim) |
| 103 fprintf (stderr, "rl78 minisim: desc != &the_minisim\n"); |
| 104 } |
| 105 |
| 106 /* Close the sim. */ |
| 107 |
| 108 void |
| 109 sim_close (SIM_DESC sd, int quitting) |
| 110 { |
| 111 check_desc (sd); |
| 112 |
| 113 /* Not much to do. At least free up our memory. */ |
| 114 init_mem (); |
| 115 |
| 116 open = 0; |
| 117 } |
| 118 |
| 119 /* Open the program to run; print a message if the program cannot |
| 120 be opened. */ |
| 121 |
| 122 static bfd * |
| 123 open_objfile (const char *filename) |
| 124 { |
| 125 bfd *prog = bfd_openr (filename, 0); |
| 126 |
| 127 if (!prog) |
| 128 { |
| 129 fprintf (stderr, "Can't read %s\n", filename); |
| 130 return 0; |
| 131 } |
| 132 |
| 133 if (!bfd_check_format (prog, bfd_object)) |
| 134 { |
| 135 fprintf (stderr, "%s not a rl78 program\n", filename); |
| 136 return 0; |
| 137 } |
| 138 |
| 139 return prog; |
| 140 } |
| 141 |
| 142 /* Load a program. */ |
| 143 |
| 144 SIM_RC |
| 145 sim_load (SIM_DESC sd, char *prog, struct bfd *abfd, int from_tty) |
| 146 { |
| 147 check_desc (sd); |
| 148 |
| 149 if (!abfd) |
| 150 abfd = open_objfile (prog); |
| 151 if (!abfd) |
| 152 return SIM_RC_FAIL; |
| 153 |
| 154 rl78_load (abfd, host_callbacks, "sim"); |
| 155 |
| 156 return SIM_RC_OK; |
| 157 } |
| 158 |
| 159 /* Create inferior. */ |
| 160 |
| 161 SIM_RC |
| 162 sim_create_inferior (SIM_DESC sd, struct bfd *abfd, char **argv, char **env) |
| 163 { |
| 164 check_desc (sd); |
| 165 |
| 166 if (abfd) |
| 167 rl78_load (abfd, 0, "sim"); |
| 168 |
| 169 return SIM_RC_OK; |
| 170 } |
| 171 |
| 172 /* Read memory. */ |
| 173 |
| 174 int |
| 175 sim_read (SIM_DESC sd, SIM_ADDR mem, unsigned char *buf, int length) |
| 176 { |
| 177 check_desc (sd); |
| 178 |
| 179 if (mem >= MEM_SIZE) |
| 180 return 0; |
| 181 else if (mem + length > MEM_SIZE) |
| 182 length = MEM_SIZE - mem; |
| 183 |
| 184 mem_get_blk (mem, buf, length); |
| 185 return length; |
| 186 } |
| 187 |
| 188 /* Write memory. */ |
| 189 |
| 190 int |
| 191 sim_write (SIM_DESC sd, SIM_ADDR mem, const unsigned char *buf, int length) |
| 192 { |
| 193 check_desc (sd); |
| 194 |
| 195 if (mem >= MEM_SIZE) |
| 196 return 0; |
| 197 else if (mem + length > MEM_SIZE) |
| 198 length = MEM_SIZE - mem; |
| 199 |
| 200 mem_put_blk (mem, buf, length); |
| 201 return length; |
| 202 } |
| 203 |
| 204 /* Read the LENGTH bytes at BUF as an little-endian value. */ |
| 205 |
| 206 static SI |
| 207 get_le (unsigned char *buf, int length) |
| 208 { |
| 209 SI acc = 0; |
| 210 |
| 211 while (--length >= 0) |
| 212 acc = (acc << 8) + buf[length]; |
| 213 |
| 214 return acc; |
| 215 } |
| 216 |
| 217 /* Store VAL as a little-endian value in the LENGTH bytes at BUF. */ |
| 218 |
| 219 static void |
| 220 put_le (unsigned char *buf, int length, SI val) |
| 221 { |
| 222 int i; |
| 223 |
| 224 for (i = 0; i < length; i++) |
| 225 { |
| 226 buf[i] = val & 0xff; |
| 227 val >>= 8; |
| 228 } |
| 229 } |
| 230 |
| 231 /* Verify that REGNO is in the proper range. Return 0 if not and |
| 232 something non-zero if so. */ |
| 233 |
| 234 static int |
| 235 check_regno (enum sim_rl78_regnum regno) |
| 236 { |
| 237 return 0 <= regno && regno < sim_rl78_num_regs; |
| 238 } |
| 239 |
| 240 /* Return the size of the register REGNO. */ |
| 241 |
| 242 static size_t |
| 243 reg_size (enum sim_rl78_regnum regno) |
| 244 { |
| 245 size_t size; |
| 246 |
| 247 if (regno == sim_rl78_pc_regnum) |
| 248 size = 4; |
| 249 else |
| 250 size = 1; |
| 251 |
| 252 return size; |
| 253 } |
| 254 |
| 255 /* Return the register address associated with the register specified by |
| 256 REGNO. */ |
| 257 |
| 258 static unsigned long |
| 259 reg_addr (enum sim_rl78_regnum regno) |
| 260 { |
| 261 if (sim_rl78_bank0_r0_regnum <= regno |
| 262 && regno <= sim_rl78_bank0_r7_regnum) |
| 263 return 0xffef8 + (regno - sim_rl78_bank0_r0_regnum); |
| 264 else if (sim_rl78_bank1_r0_regnum <= regno |
| 265 && regno <= sim_rl78_bank1_r7_regnum) |
| 266 return 0xffef0 + (regno - sim_rl78_bank1_r0_regnum); |
| 267 else if (sim_rl78_bank2_r0_regnum <= regno |
| 268 && regno <= sim_rl78_bank2_r7_regnum) |
| 269 return 0xffee8 + (regno - sim_rl78_bank2_r0_regnum); |
| 270 else if (sim_rl78_bank3_r0_regnum <= regno |
| 271 && regno <= sim_rl78_bank3_r7_regnum) |
| 272 return 0xffee0 + (regno - sim_rl78_bank3_r0_regnum); |
| 273 else if (regno == sim_rl78_psw_regnum) |
| 274 return 0xffffa; |
| 275 else if (regno == sim_rl78_es_regnum) |
| 276 return 0xffffd; |
| 277 else if (regno == sim_rl78_cs_regnum) |
| 278 return 0xffffc; |
| 279 /* Note: We can't handle PC here because it's not memory mapped. */ |
| 280 else if (regno == sim_rl78_spl_regnum) |
| 281 return 0xffff8; |
| 282 else if (regno == sim_rl78_sph_regnum) |
| 283 return 0xffff9; |
| 284 else if (regno == sim_rl78_pmc_regnum) |
| 285 return 0xffffe; |
| 286 else if (regno == sim_rl78_mem_regnum) |
| 287 return 0xfffff; |
| 288 |
| 289 return 0; |
| 290 } |
| 291 |
| 292 /* Fetch the contents of the register specified by REGNO, placing the |
| 293 contents in BUF. The length LENGTH must match the sim's internal |
| 294 notion of the register's size. */ |
| 295 |
| 296 int |
| 297 sim_fetch_register (SIM_DESC sd, int regno, unsigned char *buf, int length) |
| 298 { |
| 299 size_t size; |
| 300 SI val; |
| 301 |
| 302 check_desc (sd); |
| 303 |
| 304 if (!check_regno (regno)) |
| 305 return 0; |
| 306 |
| 307 size = reg_size (regno); |
| 308 |
| 309 if (length != size) |
| 310 return 0; |
| 311 |
| 312 if (regno == sim_rl78_pc_regnum) |
| 313 val = pc; |
| 314 else |
| 315 val = memory[reg_addr (regno)]; |
| 316 |
| 317 put_le (buf, length, val); |
| 318 |
| 319 return size; |
| 320 } |
| 321 |
| 322 /* Store the value stored in BUF to the register REGNO. The length |
| 323 LENGTH must match the sim's internal notion of the register size. */ |
| 324 |
| 325 int |
| 326 sim_store_register (SIM_DESC sd, int regno, unsigned char *buf, int length) |
| 327 { |
| 328 size_t size; |
| 329 SI val; |
| 330 |
| 331 check_desc (sd); |
| 332 |
| 333 if (!check_regno (regno)) |
| 334 return -1; |
| 335 |
| 336 size = reg_size (regno); |
| 337 |
| 338 if (length != size) |
| 339 return -1; |
| 340 |
| 341 val = get_le (buf, length); |
| 342 |
| 343 if (regno == sim_rl78_pc_regnum) |
| 344 pc = val; |
| 345 else |
| 346 memory[reg_addr (regno)] = val; |
| 347 return size; |
| 348 } |
| 349 |
| 350 /* Print out message associated with "info target". */ |
| 351 |
| 352 void |
| 353 sim_info (SIM_DESC sd, int verbose) |
| 354 { |
| 355 check_desc (sd); |
| 356 |
| 357 printf ("The rl78 minisim doesn't collect any statistics.\n"); |
| 358 } |
| 359 |
| 360 static volatile int stop; |
| 361 static enum sim_stop reason; |
| 362 int siggnal; |
| 363 |
| 364 |
| 365 /* Given a signal number used by the rl78 bsp (that is, newlib), |
| 366 return the corresponding signal numbers. */ |
| 367 |
| 368 int |
| 369 rl78_signal_to_target (int sig) |
| 370 { |
| 371 switch (sig) |
| 372 { |
| 373 case 4: |
| 374 return GDB_SIGNAL_ILL; |
| 375 |
| 376 case 5: |
| 377 return GDB_SIGNAL_TRAP; |
| 378 |
| 379 case 10: |
| 380 return GDB_SIGNAL_BUS; |
| 381 |
| 382 case 11: |
| 383 return GDB_SIGNAL_SEGV; |
| 384 |
| 385 case 24: |
| 386 return GDB_SIGNAL_XCPU; |
| 387 break; |
| 388 |
| 389 case 2: |
| 390 return GDB_SIGNAL_INT; |
| 391 |
| 392 case 8: |
| 393 return GDB_SIGNAL_FPE; |
| 394 break; |
| 395 |
| 396 case 6: |
| 397 return GDB_SIGNAL_ABRT; |
| 398 } |
| 399 |
| 400 return 0; |
| 401 } |
| 402 |
| 403 |
| 404 /* Take a step return code RC and set up the variables consulted by |
| 405 sim_stop_reason appropriately. */ |
| 406 |
| 407 void |
| 408 handle_step (int rc) |
| 409 { |
| 410 if (RL78_STEPPED (rc) || RL78_HIT_BREAK (rc)) |
| 411 { |
| 412 reason = sim_stopped; |
| 413 siggnal = GDB_SIGNAL_TRAP; |
| 414 } |
| 415 else if (RL78_STOPPED (rc)) |
| 416 { |
| 417 reason = sim_stopped; |
| 418 siggnal = rl78_signal_to_target (RL78_STOP_SIG (rc)); |
| 419 } |
| 420 else |
| 421 { |
| 422 assert (RL78_EXITED (rc)); |
| 423 reason = sim_exited; |
| 424 siggnal = RL78_EXIT_STATUS (rc); |
| 425 } |
| 426 } |
| 427 |
| 428 |
| 429 /* Resume execution after a stop. */ |
| 430 |
| 431 void |
| 432 sim_resume (SIM_DESC sd, int step, int sig_to_deliver) |
| 433 { |
| 434 int rc; |
| 435 |
| 436 check_desc (sd); |
| 437 |
| 438 if (sig_to_deliver != 0) |
| 439 { |
| 440 fprintf (stderr, |
| 441 "Warning: the rl78 minisim does not implement " |
| 442 "signal delivery yet.\n" "Resuming with no signal.\n"); |
| 443 } |
| 444 |
| 445 /* We don't clear 'stop' here, because then we would miss |
| 446 interrupts that arrived on the way here. Instead, we clear |
| 447 the flag in sim_stop_reason, after GDB has disabled the |
| 448 interrupt signal handler. */ |
| 449 for (;;) |
| 450 { |
| 451 if (stop) |
| 452 { |
| 453 stop = 0; |
| 454 reason = sim_stopped; |
| 455 siggnal = GDB_SIGNAL_INT; |
| 456 break; |
| 457 } |
| 458 |
| 459 if (hw_breakpoints[pc >> 3] |
| 460 && (hw_breakpoints[pc >> 3] & (1 << (pc & 0x7)))) |
| 461 { |
| 462 reason = sim_stopped; |
| 463 siggnal = GDB_SIGNAL_TRAP; |
| 464 break; |
| 465 } |
| 466 rc = setjmp (decode_jmp_buf); |
| 467 if (rc == 0) |
| 468 rc = decode_opcode (); |
| 469 |
| 470 if (!RL78_STEPPED (rc) || step) |
| 471 { |
| 472 handle_step (rc); |
| 473 break; |
| 474 } |
| 475 } |
| 476 } |
| 477 |
| 478 /* Stop the sim. */ |
| 479 |
| 480 int |
| 481 sim_stop (SIM_DESC sd) |
| 482 { |
| 483 stop = 1; |
| 484 |
| 485 return 1; |
| 486 } |
| 487 |
| 488 /* Fetch the stop reason and signal. */ |
| 489 |
| 490 void |
| 491 sim_stop_reason (SIM_DESC sd, enum sim_stop *reason_p, int *sigrc_p) |
| 492 { |
| 493 check_desc (sd); |
| 494 |
| 495 *reason_p = reason; |
| 496 *sigrc_p = siggnal; |
| 497 } |
| 498 |
| 499 /* Execute the sim-specific command associated with GDB's "sim ..." |
| 500 command. */ |
| 501 |
| 502 void |
| 503 sim_do_command (SIM_DESC sd, char *cmd) |
| 504 { |
| 505 char *args; |
| 506 |
| 507 check_desc (sd); |
| 508 |
| 509 if (cmd == NULL) |
| 510 { |
| 511 cmd = ""; |
| 512 args = ""; |
| 513 } |
| 514 else |
| 515 { |
| 516 char *p = cmd; |
| 517 |
| 518 /* Skip leading whitespace. */ |
| 519 while (isspace (*p)) |
| 520 p++; |
| 521 |
| 522 /* Find the extent of the command word. */ |
| 523 for (p = cmd; *p; p++) |
| 524 if (isspace (*p)) |
| 525 break; |
| 526 |
| 527 /* Null-terminate the command word, and record the start of any |
| 528 further arguments. */ |
| 529 if (*p) |
| 530 { |
| 531 *p = '\0'; |
| 532 args = p + 1; |
| 533 while (isspace (*args)) |
| 534 args++; |
| 535 } |
| 536 else |
| 537 args = p; |
| 538 } |
| 539 |
| 540 if (strcmp (cmd, "trace") == 0) |
| 541 { |
| 542 if (strcmp (args, "on") == 0) |
| 543 trace = 1; |
| 544 else if (strcmp (args, "off") == 0) |
| 545 trace = 0; |
| 546 else |
| 547 printf ("The 'sim trace' command expects 'on' or 'off' " |
| 548 "as an argument.\n"); |
| 549 } |
| 550 else if (strcmp (cmd, "verbose") == 0) |
| 551 { |
| 552 if (strcmp (args, "on") == 0) |
| 553 verbose = 1; |
| 554 else if (strcmp (args, "noisy") == 0) |
| 555 verbose = 2; |
| 556 else if (strcmp (args, "off") == 0) |
| 557 verbose = 0; |
| 558 else |
| 559 printf ("The 'sim verbose' command expects 'on', 'noisy', or 'off'" |
| 560 " as an argument.\n"); |
| 561 } |
| 562 else |
| 563 printf ("The 'sim' command expects either 'trace' or 'verbose'" |
| 564 " as a subcommand.\n"); |
| 565 } |
| 566 |
| 567 /* Stub for command completion. */ |
| 568 |
| 569 char ** |
| 570 sim_complete_command (SIM_DESC sd, char *text, char *word) |
| 571 { |
| 572 return NULL; |
| 573 } |
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