| 1 | /* Target communications support for Macraigor Systems' On-Chip Debugging |
| 2 | |
| 3 | Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2004 Free |
| 4 | Software Foundation, Inc. |
| 5 | |
| 6 | This file is part of GDB. |
| 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 2 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, write to the Free Software |
| 20 | Foundation, Inc., 59 Temple Place - Suite 330, |
| 21 | Boston, MA 02111-1307, USA. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include "gdbcore.h" |
| 25 | #include "gdb_string.h" |
| 26 | #include <fcntl.h> |
| 27 | #include "frame.h" |
| 28 | #include "inferior.h" |
| 29 | #include "bfd.h" |
| 30 | #include "symfile.h" |
| 31 | #include "target.h" |
| 32 | #include "gdbcmd.h" |
| 33 | #include "objfiles.h" |
| 34 | #include "gdb-stabs.h" |
| 35 | #include <sys/types.h> |
| 36 | #include <signal.h> |
| 37 | #include "serial.h" |
| 38 | #include "ocd.h" |
| 39 | #include "regcache.h" |
| 40 | |
| 41 | /* Prototypes for local functions */ |
| 42 | |
| 43 | static int ocd_read_bytes (CORE_ADDR memaddr, char *myaddr, int len); |
| 44 | |
| 45 | static int ocd_start_remote (void *dummy); |
| 46 | |
| 47 | static int readchar (int timeout); |
| 48 | |
| 49 | static void ocd_interrupt (int signo); |
| 50 | |
| 51 | static void ocd_interrupt_twice (int signo); |
| 52 | |
| 53 | static void interrupt_query (void); |
| 54 | |
| 55 | static unsigned char *ocd_do_command (int cmd, int *statusp, int *lenp); |
| 56 | |
| 57 | static void ocd_put_packet (unsigned char *packet, int pktlen); |
| 58 | |
| 59 | static unsigned char *ocd_get_packet (int cmd, int *pktlen, int timeout); |
| 60 | |
| 61 | static struct target_ops *current_ops = NULL; |
| 62 | |
| 63 | static int last_run_status; |
| 64 | |
| 65 | /* Descriptor for I/O to remote machine. Initialize it to NULL so that |
| 66 | ocd_open knows that we don't have a file open when the program |
| 67 | starts. */ |
| 68 | static struct serial *ocd_desc = NULL; |
| 69 | \f |
| 70 | void |
| 71 | ocd_error (char *s, int error_code) |
| 72 | { |
| 73 | char buf[100]; |
| 74 | |
| 75 | fputs_filtered (s, gdb_stderr); |
| 76 | fputs_filtered (" ", gdb_stderr); |
| 77 | |
| 78 | switch (error_code) |
| 79 | { |
| 80 | case 0x1: |
| 81 | s = "Unknown fault"; |
| 82 | break; |
| 83 | case 0x2: |
| 84 | s = "Power failed"; |
| 85 | break; |
| 86 | case 0x3: |
| 87 | s = "Cable disconnected"; |
| 88 | break; |
| 89 | case 0x4: |
| 90 | s = "Couldn't enter OCD mode"; |
| 91 | break; |
| 92 | case 0x5: |
| 93 | s = "Target stuck in reset"; |
| 94 | break; |
| 95 | case 0x6: |
| 96 | s = "OCD hasn't been initialized"; |
| 97 | break; |
| 98 | case 0x7: |
| 99 | s = "Write verify failed"; |
| 100 | break; |
| 101 | case 0x8: |
| 102 | s = "Reg buff error (during MPC5xx fp reg read/write)"; |
| 103 | break; |
| 104 | case 0x9: |
| 105 | s = "Invalid CPU register access attempt failed"; |
| 106 | break; |
| 107 | case 0x11: |
| 108 | s = "Bus error"; |
| 109 | break; |
| 110 | case 0x12: |
| 111 | s = "Checksum error"; |
| 112 | break; |
| 113 | case 0x13: |
| 114 | s = "Illegal command"; |
| 115 | break; |
| 116 | case 0x14: |
| 117 | s = "Parameter error"; |
| 118 | break; |
| 119 | case 0x15: |
| 120 | s = "Internal error"; |
| 121 | break; |
| 122 | case 0x80: |
| 123 | s = "Flash erase error"; |
| 124 | break; |
| 125 | default: |
| 126 | sprintf (buf, "Unknown error code %d", error_code); |
| 127 | s = buf; |
| 128 | } |
| 129 | |
| 130 | error ("%s", s); |
| 131 | } |
| 132 | |
| 133 | /* Return nonzero if the thread TH is still alive on the remote system. */ |
| 134 | |
| 135 | int |
| 136 | ocd_thread_alive (ptid_t th) |
| 137 | { |
| 138 | return 1; |
| 139 | } |
| 140 | \f |
| 141 | /* Clean up connection to a remote debugger. */ |
| 142 | |
| 143 | void |
| 144 | ocd_close (int quitting) |
| 145 | { |
| 146 | if (ocd_desc) |
| 147 | serial_close (ocd_desc); |
| 148 | ocd_desc = NULL; |
| 149 | } |
| 150 | |
| 151 | /* Stub for catch_errors. */ |
| 152 | |
| 153 | static int |
| 154 | ocd_start_remote (void *dummy) |
| 155 | { |
| 156 | unsigned char buf[10], *p; |
| 157 | int pktlen; |
| 158 | int status; |
| 159 | int error_code; |
| 160 | int speed; |
| 161 | enum ocd_target_type target_type; |
| 162 | |
| 163 | target_type = *(enum ocd_target_type *) dummy; |
| 164 | |
| 165 | immediate_quit++; /* Allow user to interrupt it */ |
| 166 | |
| 167 | serial_send_break (ocd_desc); /* Wake up the wiggler */ |
| 168 | |
| 169 | speed = 80; /* Divide clock by 4000 */ |
| 170 | |
| 171 | buf[0] = OCD_INIT; |
| 172 | buf[1] = speed >> 8; |
| 173 | buf[2] = speed & 0xff; |
| 174 | buf[3] = target_type; |
| 175 | ocd_put_packet (buf, 4); /* Init OCD params */ |
| 176 | p = ocd_get_packet (buf[0], &pktlen, remote_timeout); |
| 177 | |
| 178 | if (pktlen < 2) |
| 179 | error ("Truncated response packet from OCD device"); |
| 180 | |
| 181 | status = p[1]; |
| 182 | error_code = p[2]; |
| 183 | |
| 184 | if (error_code != 0) |
| 185 | ocd_error ("OCD_INIT:", error_code); |
| 186 | |
| 187 | ocd_do_command (OCD_AYT, &status, &pktlen); |
| 188 | |
| 189 | p = ocd_do_command (OCD_GET_VERSION, &status, &pktlen); |
| 190 | |
| 191 | printf_unfiltered ("[Wiggler version %x.%x, capability 0x%x]\n", |
| 192 | p[0], p[1], (p[2] << 16) | p[3]); |
| 193 | |
| 194 | /* If processor is still running, stop it. */ |
| 195 | |
| 196 | if (!(status & OCD_FLAG_BDM)) |
| 197 | ocd_stop (); |
| 198 | |
| 199 | /* When using a target box, we want to asynchronously return status when |
| 200 | target stops. The OCD_SET_CTL_FLAGS command is ignored by Wigglers.dll |
| 201 | when using a parallel Wiggler */ |
| 202 | buf[0] = OCD_SET_CTL_FLAGS; |
| 203 | buf[1] = 0; |
| 204 | buf[2] = 1; |
| 205 | ocd_put_packet (buf, 3); |
| 206 | |
| 207 | p = ocd_get_packet (buf[0], &pktlen, remote_timeout); |
| 208 | |
| 209 | if (pktlen < 2) |
| 210 | error ("Truncated response packet from OCD device"); |
| 211 | |
| 212 | status = p[1]; |
| 213 | error_code = p[2]; |
| 214 | |
| 215 | if (error_code != 0) |
| 216 | ocd_error ("OCD_SET_CTL_FLAGS:", error_code); |
| 217 | |
| 218 | immediate_quit--; |
| 219 | |
| 220 | /* This is really the job of start_remote however, that makes an assumption |
| 221 | that the target is about to print out a status message of some sort. That |
| 222 | doesn't happen here (in fact, it may not be possible to get the monitor to |
| 223 | send the appropriate packet). */ |
| 224 | |
| 225 | flush_cached_frames (); |
| 226 | registers_changed (); |
| 227 | stop_pc = read_pc (); |
| 228 | print_stack_frame (get_selected_frame (), -1, 1); |
| 229 | |
| 230 | buf[0] = OCD_LOG_FILE; |
| 231 | buf[1] = 3; /* close existing WIGGLERS.LOG */ |
| 232 | ocd_put_packet (buf, 2); |
| 233 | p = ocd_get_packet (buf[0], &pktlen, remote_timeout); |
| 234 | |
| 235 | buf[0] = OCD_LOG_FILE; |
| 236 | buf[1] = 2; /* append to existing WIGGLERS.LOG */ |
| 237 | ocd_put_packet (buf, 2); |
| 238 | p = ocd_get_packet (buf[0], &pktlen, remote_timeout); |
| 239 | |
| 240 | return 1; |
| 241 | } |
| 242 | |
| 243 | /* Open a connection to a remote debugger. |
| 244 | NAME is the filename used for communication. */ |
| 245 | |
| 246 | void |
| 247 | ocd_open (char *name, int from_tty, enum ocd_target_type target_type, |
| 248 | struct target_ops *ops) |
| 249 | { |
| 250 | unsigned char buf[10], *p; |
| 251 | int pktlen; |
| 252 | |
| 253 | if (name == 0) |
| 254 | error ("To open an OCD connection, you need to specify the\n\ |
| 255 | device the OCD device is attached to (e.g. /dev/ttya)."); |
| 256 | |
| 257 | target_preopen (from_tty); |
| 258 | |
| 259 | current_ops = ops; |
| 260 | |
| 261 | unpush_target (current_ops); |
| 262 | |
| 263 | ocd_desc = serial_open (name); |
| 264 | if (!ocd_desc) |
| 265 | perror_with_name (name); |
| 266 | |
| 267 | if (baud_rate != -1) |
| 268 | { |
| 269 | if (serial_setbaudrate (ocd_desc, baud_rate)) |
| 270 | { |
| 271 | serial_close (ocd_desc); |
| 272 | perror_with_name (name); |
| 273 | } |
| 274 | } |
| 275 | |
| 276 | serial_raw (ocd_desc); |
| 277 | |
| 278 | /* If there is something sitting in the buffer we might take it as a |
| 279 | response to a command, which would be bad. */ |
| 280 | serial_flush_input (ocd_desc); |
| 281 | |
| 282 | if (from_tty) |
| 283 | { |
| 284 | puts_filtered ("Remote target wiggler connected to "); |
| 285 | puts_filtered (name); |
| 286 | puts_filtered ("\n"); |
| 287 | } |
| 288 | push_target (current_ops); /* Switch to using remote target now */ |
| 289 | |
| 290 | /* Without this, some commands which require an active target (such as kill) |
| 291 | won't work. This variable serves (at least) double duty as both the pid |
| 292 | of the target process (if it has such), and as a flag indicating that a |
| 293 | target is active. These functions should be split out into seperate |
| 294 | variables, especially since GDB will someday have a notion of debugging |
| 295 | several processes. */ |
| 296 | |
| 297 | inferior_ptid = pid_to_ptid (42000); |
| 298 | /* Start the remote connection; if error (0), discard this target. |
| 299 | In particular, if the user quits, be sure to discard it |
| 300 | (we'd be in an inconsistent state otherwise). */ |
| 301 | if (!catch_errors (ocd_start_remote, &target_type, |
| 302 | "Couldn't establish connection to remote target\n", |
| 303 | RETURN_MASK_ALL)) |
| 304 | { |
| 305 | pop_target (); |
| 306 | error ("Failed to connect to OCD."); |
| 307 | } |
| 308 | } |
| 309 | |
| 310 | /* This takes a program previously attached to and detaches it. After |
| 311 | this is done, GDB can be used to debug some other program. We |
| 312 | better not have left any breakpoints in the target program or it'll |
| 313 | die when it hits one. */ |
| 314 | |
| 315 | void |
| 316 | ocd_detach (char *args, int from_tty) |
| 317 | { |
| 318 | if (args) |
| 319 | error ("Argument given to \"detach\" when remotely debugging."); |
| 320 | |
| 321 | pop_target (); |
| 322 | if (from_tty) |
| 323 | puts_filtered ("Ending remote debugging.\n"); |
| 324 | } |
| 325 | \f |
| 326 | /* Tell the remote machine to resume. */ |
| 327 | |
| 328 | void |
| 329 | ocd_resume (ptid_t ptid, int step, enum target_signal siggnal) |
| 330 | { |
| 331 | int pktlen; |
| 332 | |
| 333 | if (step) |
| 334 | ocd_do_command (OCD_STEP, &last_run_status, &pktlen); |
| 335 | else |
| 336 | ocd_do_command (OCD_RUN, &last_run_status, &pktlen); |
| 337 | } |
| 338 | \f |
| 339 | void |
| 340 | ocd_stop (void) |
| 341 | { |
| 342 | int status; |
| 343 | int pktlen; |
| 344 | |
| 345 | ocd_do_command (OCD_STOP, &status, &pktlen); |
| 346 | |
| 347 | if (!(status & OCD_FLAG_BDM)) |
| 348 | error ("Can't stop target via BDM"); |
| 349 | } |
| 350 | |
| 351 | static volatile int ocd_interrupt_flag; |
| 352 | |
| 353 | /* Send ^C to target to halt it. Target will respond, and send us a |
| 354 | packet. */ |
| 355 | |
| 356 | static void |
| 357 | ocd_interrupt (int signo) |
| 358 | { |
| 359 | /* If this doesn't work, try more severe steps. */ |
| 360 | signal (signo, ocd_interrupt_twice); |
| 361 | |
| 362 | if (remote_debug) |
| 363 | printf_unfiltered ("ocd_interrupt called\n"); |
| 364 | |
| 365 | { |
| 366 | char buf[1]; |
| 367 | |
| 368 | ocd_stop (); |
| 369 | buf[0] = OCD_AYT; |
| 370 | ocd_put_packet (buf, 1); |
| 371 | ocd_interrupt_flag = 1; |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | static void (*ofunc) (); |
| 376 | |
| 377 | /* The user typed ^C twice. */ |
| 378 | static void |
| 379 | ocd_interrupt_twice (int signo) |
| 380 | { |
| 381 | signal (signo, ofunc); |
| 382 | |
| 383 | interrupt_query (); |
| 384 | |
| 385 | signal (signo, ocd_interrupt); |
| 386 | } |
| 387 | |
| 388 | /* Ask the user what to do when an interrupt is received. */ |
| 389 | |
| 390 | static void |
| 391 | interrupt_query (void) |
| 392 | { |
| 393 | target_terminal_ours (); |
| 394 | |
| 395 | if (query ("Interrupted while waiting for the program.\n\ |
| 396 | Give up (and stop debugging it)? ")) |
| 397 | { |
| 398 | target_mourn_inferior (); |
| 399 | throw_exception (RETURN_QUIT); |
| 400 | } |
| 401 | |
| 402 | target_terminal_inferior (); |
| 403 | } |
| 404 | |
| 405 | /* If nonzero, ignore the next kill. */ |
| 406 | static int kill_kludge; |
| 407 | |
| 408 | /* Wait until the remote machine stops, then return, |
| 409 | storing status in STATUS just as `wait' would. |
| 410 | Returns "pid" (though it's not clear what, if anything, that |
| 411 | means in the case of this target). */ |
| 412 | |
| 413 | int |
| 414 | ocd_wait (void) |
| 415 | { |
| 416 | unsigned char *p; |
| 417 | int error_code; |
| 418 | int pktlen; |
| 419 | char buf[1]; |
| 420 | |
| 421 | ocd_interrupt_flag = 0; |
| 422 | |
| 423 | /* Target might already be stopped by the time we get here. */ |
| 424 | /* If we aren't already stopped, we need to loop until we've dropped |
| 425 | back into BDM mode */ |
| 426 | |
| 427 | while (!(last_run_status & OCD_FLAG_BDM)) |
| 428 | { |
| 429 | buf[0] = OCD_AYT; |
| 430 | ocd_put_packet (buf, 1); |
| 431 | p = ocd_get_packet (OCD_AYT, &pktlen, -1); |
| 432 | |
| 433 | ofunc = (void (*)()) signal (SIGINT, ocd_interrupt); |
| 434 | signal (SIGINT, ofunc); |
| 435 | |
| 436 | if (pktlen < 2) |
| 437 | error ("Truncated response packet from OCD device"); |
| 438 | |
| 439 | last_run_status = p[1]; |
| 440 | error_code = p[2]; |
| 441 | |
| 442 | if (error_code != 0) |
| 443 | ocd_error ("target_wait:", error_code); |
| 444 | |
| 445 | if (last_run_status & OCD_FLAG_PWF) |
| 446 | error ("OCD device lost VCC at BDM interface."); |
| 447 | else if (last_run_status & OCD_FLAG_CABLE_DISC) |
| 448 | error ("OCD device cable appears to have been disconnected."); |
| 449 | } |
| 450 | |
| 451 | if (ocd_interrupt_flag) |
| 452 | return 1; |
| 453 | else |
| 454 | return 0; |
| 455 | } |
| 456 | |
| 457 | /* Read registers from the OCD device. Specify the starting and ending |
| 458 | register number. Return the number of regs actually read in *NUMREGS. |
| 459 | Returns a pointer to a static array containing the register contents. */ |
| 460 | |
| 461 | unsigned char * |
| 462 | ocd_read_bdm_registers (int first_bdm_regno, int last_bdm_regno, int *reglen) |
| 463 | { |
| 464 | unsigned char buf[10]; |
| 465 | int i; |
| 466 | unsigned char *p; |
| 467 | unsigned char *regs; |
| 468 | int error_code, status; |
| 469 | int pktlen; |
| 470 | |
| 471 | buf[0] = OCD_READ_REGS; |
| 472 | buf[1] = first_bdm_regno >> 8; |
| 473 | buf[2] = first_bdm_regno & 0xff; |
| 474 | buf[3] = last_bdm_regno >> 8; |
| 475 | buf[4] = last_bdm_regno & 0xff; |
| 476 | |
| 477 | ocd_put_packet (buf, 5); |
| 478 | p = ocd_get_packet (OCD_READ_REGS, &pktlen, remote_timeout); |
| 479 | |
| 480 | status = p[1]; |
| 481 | error_code = p[2]; |
| 482 | |
| 483 | if (error_code != 0) |
| 484 | ocd_error ("read_bdm_registers:", error_code); |
| 485 | |
| 486 | i = p[3]; |
| 487 | if (i == 0) |
| 488 | i = 256; |
| 489 | |
| 490 | if (i > pktlen - 4 |
| 491 | || ((i & 3) != 0)) |
| 492 | error ("Register block size bad: %d", i); |
| 493 | |
| 494 | *reglen = i; |
| 495 | |
| 496 | regs = p + 4; |
| 497 | |
| 498 | return regs; |
| 499 | } |
| 500 | |
| 501 | /* Read register BDM_REGNO and returns its value ala read_register() */ |
| 502 | |
| 503 | CORE_ADDR |
| 504 | ocd_read_bdm_register (int bdm_regno) |
| 505 | { |
| 506 | int reglen; |
| 507 | unsigned char *p; |
| 508 | CORE_ADDR regval; |
| 509 | |
| 510 | p = ocd_read_bdm_registers (bdm_regno, bdm_regno, ®len); |
| 511 | regval = extract_unsigned_integer (p, reglen); |
| 512 | |
| 513 | return regval; |
| 514 | } |
| 515 | |
| 516 | void |
| 517 | ocd_write_bdm_registers (int first_bdm_regno, unsigned char *regptr, int reglen) |
| 518 | { |
| 519 | unsigned char *buf; |
| 520 | unsigned char *p; |
| 521 | int error_code, status; |
| 522 | int pktlen; |
| 523 | |
| 524 | buf = alloca (4 + reglen); |
| 525 | |
| 526 | buf[0] = OCD_WRITE_REGS; |
| 527 | buf[1] = first_bdm_regno >> 8; |
| 528 | buf[2] = first_bdm_regno & 0xff; |
| 529 | buf[3] = reglen; |
| 530 | memcpy (buf + 4, regptr, reglen); |
| 531 | |
| 532 | ocd_put_packet (buf, 4 + reglen); |
| 533 | p = ocd_get_packet (OCD_WRITE_REGS, &pktlen, remote_timeout); |
| 534 | |
| 535 | if (pktlen < 3) |
| 536 | error ("Truncated response packet from OCD device"); |
| 537 | |
| 538 | status = p[1]; |
| 539 | error_code = p[2]; |
| 540 | |
| 541 | if (error_code != 0) |
| 542 | ocd_error ("ocd_write_bdm_registers:", error_code); |
| 543 | } |
| 544 | |
| 545 | void |
| 546 | ocd_write_bdm_register (int bdm_regno, CORE_ADDR reg) |
| 547 | { |
| 548 | unsigned char buf[4]; |
| 549 | |
| 550 | store_unsigned_integer (buf, 4, reg); |
| 551 | |
| 552 | ocd_write_bdm_registers (bdm_regno, buf, 4); |
| 553 | } |
| 554 | \f |
| 555 | void |
| 556 | ocd_prepare_to_store (void) |
| 557 | { |
| 558 | } |
| 559 | \f |
| 560 | /* Write memory data directly to the remote machine. |
| 561 | This does not inform the data cache; the data cache uses this. |
| 562 | MEMADDR is the address in the remote memory space. |
| 563 | MYADDR is the address of the buffer in our space. |
| 564 | LEN is the number of bytes. |
| 565 | |
| 566 | Returns number of bytes transferred, or 0 for error. */ |
| 567 | |
| 568 | static int write_mem_command = OCD_WRITE_MEM; |
| 569 | |
| 570 | int |
| 571 | ocd_write_bytes (CORE_ADDR memaddr, char *myaddr, int len) |
| 572 | { |
| 573 | char buf[256 + 10]; |
| 574 | unsigned char *p; |
| 575 | int origlen; |
| 576 | |
| 577 | origlen = len; |
| 578 | |
| 579 | buf[0] = write_mem_command; |
| 580 | buf[5] = 1; /* Write as bytes */ |
| 581 | buf[6] = 0; /* Don't verify */ |
| 582 | |
| 583 | while (len > 0) |
| 584 | { |
| 585 | int numbytes; |
| 586 | int pktlen; |
| 587 | int status, error_code; |
| 588 | |
| 589 | numbytes = min (len, 256 - 8); |
| 590 | |
| 591 | buf[1] = memaddr >> 24; |
| 592 | buf[2] = memaddr >> 16; |
| 593 | buf[3] = memaddr >> 8; |
| 594 | buf[4] = memaddr; |
| 595 | |
| 596 | buf[7] = numbytes; |
| 597 | |
| 598 | memcpy (&buf[8], myaddr, numbytes); |
| 599 | ocd_put_packet (buf, 8 + numbytes); |
| 600 | p = ocd_get_packet (OCD_WRITE_MEM, &pktlen, remote_timeout); |
| 601 | if (pktlen < 3) |
| 602 | error ("Truncated response packet from OCD device"); |
| 603 | |
| 604 | status = p[1]; |
| 605 | error_code = p[2]; |
| 606 | |
| 607 | if (error_code == 0x11) /* Got a bus error? */ |
| 608 | { |
| 609 | CORE_ADDR error_address; |
| 610 | |
| 611 | error_address = p[3] << 24; |
| 612 | error_address |= p[4] << 16; |
| 613 | error_address |= p[5] << 8; |
| 614 | error_address |= p[6]; |
| 615 | numbytes = error_address - memaddr; |
| 616 | |
| 617 | len -= numbytes; |
| 618 | |
| 619 | errno = EIO; |
| 620 | |
| 621 | break; |
| 622 | } |
| 623 | else if (error_code != 0) |
| 624 | ocd_error ("ocd_write_bytes:", error_code); |
| 625 | |
| 626 | len -= numbytes; |
| 627 | memaddr += numbytes; |
| 628 | myaddr += numbytes; |
| 629 | } |
| 630 | |
| 631 | return origlen - len; |
| 632 | } |
| 633 | |
| 634 | /* Read memory data directly from the remote machine. |
| 635 | This does not use the data cache; the data cache uses this. |
| 636 | MEMADDR is the address in the remote memory space. |
| 637 | MYADDR is the address of the buffer in our space. |
| 638 | LEN is the number of bytes. |
| 639 | |
| 640 | Returns number of bytes transferred, or 0 for error. */ |
| 641 | |
| 642 | static int |
| 643 | ocd_read_bytes (CORE_ADDR memaddr, char *myaddr, int len) |
| 644 | { |
| 645 | char buf[256 + 10]; |
| 646 | unsigned char *p; |
| 647 | int origlen; |
| 648 | |
| 649 | origlen = len; |
| 650 | |
| 651 | buf[0] = OCD_READ_MEM; |
| 652 | buf[5] = 1; /* Read as bytes */ |
| 653 | |
| 654 | while (len > 0) |
| 655 | { |
| 656 | int numbytes; |
| 657 | int pktlen; |
| 658 | int status, error_code; |
| 659 | |
| 660 | numbytes = min (len, 256 - 7); |
| 661 | |
| 662 | buf[1] = memaddr >> 24; |
| 663 | buf[2] = memaddr >> 16; |
| 664 | buf[3] = memaddr >> 8; |
| 665 | buf[4] = memaddr; |
| 666 | |
| 667 | buf[6] = numbytes; |
| 668 | |
| 669 | ocd_put_packet (buf, 7); |
| 670 | p = ocd_get_packet (OCD_READ_MEM, &pktlen, remote_timeout); |
| 671 | if (pktlen < 4) |
| 672 | error ("Truncated response packet from OCD device"); |
| 673 | |
| 674 | status = p[1]; |
| 675 | error_code = p[2]; |
| 676 | |
| 677 | if (error_code == 0x11) /* Got a bus error? */ |
| 678 | { |
| 679 | CORE_ADDR error_address; |
| 680 | |
| 681 | error_address = p[3] << 24; |
| 682 | error_address |= p[4] << 16; |
| 683 | error_address |= p[5] << 8; |
| 684 | error_address |= p[6]; |
| 685 | numbytes = error_address - memaddr; |
| 686 | |
| 687 | len -= numbytes; |
| 688 | |
| 689 | errno = EIO; |
| 690 | |
| 691 | break; |
| 692 | } |
| 693 | else if (error_code != 0) |
| 694 | ocd_error ("ocd_read_bytes:", error_code); |
| 695 | |
| 696 | memcpy (myaddr, &p[4], numbytes); |
| 697 | |
| 698 | len -= numbytes; |
| 699 | memaddr += numbytes; |
| 700 | myaddr += numbytes; |
| 701 | } |
| 702 | |
| 703 | return origlen - len; |
| 704 | } |
| 705 | \f |
| 706 | /* Read or write LEN bytes from inferior memory at MEMADDR, transferring |
| 707 | to or from debugger address MYADDR. Write to inferior if SHOULD_WRITE is |
| 708 | nonzero. Returns length of data written or read; 0 for error. TARGET |
| 709 | is ignored. */ |
| 710 | |
| 711 | int |
| 712 | ocd_xfer_memory (CORE_ADDR memaddr, char *myaddr, int len, int should_write, |
| 713 | struct mem_attrib *attrib, struct target_ops *target) |
| 714 | { |
| 715 | int res; |
| 716 | |
| 717 | if (should_write) |
| 718 | res = ocd_write_bytes (memaddr, myaddr, len); |
| 719 | else |
| 720 | res = ocd_read_bytes (memaddr, myaddr, len); |
| 721 | |
| 722 | return res; |
| 723 | } |
| 724 | \f |
| 725 | void |
| 726 | ocd_files_info (struct target_ops *ignore) |
| 727 | { |
| 728 | puts_filtered ("Debugging a target over a serial line.\n"); |
| 729 | } |
| 730 | \f |
| 731 | /* Stuff for dealing with the packets which are part of this protocol. |
| 732 | See comment at top of file for details. */ |
| 733 | |
| 734 | /* Read a single character from the remote side, handling wierd errors. */ |
| 735 | |
| 736 | static int |
| 737 | readchar (int timeout) |
| 738 | { |
| 739 | int ch; |
| 740 | |
| 741 | ch = serial_readchar (ocd_desc, timeout); |
| 742 | |
| 743 | switch (ch) |
| 744 | { |
| 745 | case SERIAL_EOF: |
| 746 | error ("Remote connection closed"); |
| 747 | case SERIAL_ERROR: |
| 748 | perror_with_name ("Remote communication error"); |
| 749 | case SERIAL_TIMEOUT: |
| 750 | default: |
| 751 | return ch; |
| 752 | } |
| 753 | } |
| 754 | |
| 755 | /* Send a packet to the OCD device. The packet framed by a SYN character, |
| 756 | a byte count and a checksum. The byte count only counts the number of |
| 757 | bytes between the count and the checksum. A count of zero actually |
| 758 | means 256. Any SYNs within the packet (including the checksum and |
| 759 | count) must be quoted. The quote character must be quoted as well. |
| 760 | Quoting is done by replacing the character with the two-character sequence |
| 761 | DLE, {char} | 0100. Note that the quoting mechanism has no effect on the |
| 762 | byte count. */ |
| 763 | |
| 764 | static void |
| 765 | ocd_put_packet (unsigned char *buf, int len) |
| 766 | { |
| 767 | unsigned char checksum; |
| 768 | unsigned char c; |
| 769 | unsigned char *packet, *packet_ptr; |
| 770 | |
| 771 | packet = alloca (len + 1 + 1); /* packet + SYN + checksum */ |
| 772 | packet_ptr = packet; |
| 773 | |
| 774 | checksum = 0; |
| 775 | |
| 776 | *packet_ptr++ = 0x55; |
| 777 | |
| 778 | while (len-- > 0) |
| 779 | { |
| 780 | c = *buf++; |
| 781 | |
| 782 | checksum += c; |
| 783 | *packet_ptr++ = c; |
| 784 | } |
| 785 | |
| 786 | *packet_ptr++ = -checksum; |
| 787 | if (serial_write (ocd_desc, packet, packet_ptr - packet)) |
| 788 | perror_with_name ("output_packet: write failed"); |
| 789 | } |
| 790 | |
| 791 | /* Get a packet from the OCD device. Timeout is only enforced for the |
| 792 | first byte of the packet. Subsequent bytes are expected to arrive in |
| 793 | time <= remote_timeout. Returns a pointer to a static buffer containing |
| 794 | the payload of the packet. *LENP contains the length of the packet. |
| 795 | */ |
| 796 | |
| 797 | static unsigned char * |
| 798 | ocd_get_packet (int cmd, int *lenp, int timeout) |
| 799 | { |
| 800 | int ch; |
| 801 | int len; |
| 802 | static unsigned char packet[512]; |
| 803 | unsigned char *packet_ptr; |
| 804 | unsigned char checksum; |
| 805 | |
| 806 | ch = readchar (timeout); |
| 807 | |
| 808 | if (ch < 0) |
| 809 | error ("ocd_get_packet (readchar): %d", ch); |
| 810 | |
| 811 | if (ch != 0x55) |
| 812 | error ("ocd_get_packet (readchar): %d", ch); |
| 813 | |
| 814 | /* Found the start of a packet */ |
| 815 | |
| 816 | packet_ptr = packet; |
| 817 | checksum = 0; |
| 818 | |
| 819 | /* Read command char. That sort of tells us how long the packet is. */ |
| 820 | |
| 821 | ch = readchar (timeout); |
| 822 | |
| 823 | if (ch < 0) |
| 824 | error ("ocd_get_packet (readchar): %d", ch); |
| 825 | |
| 826 | *packet_ptr++ = ch; |
| 827 | checksum += ch; |
| 828 | |
| 829 | /* Get status. */ |
| 830 | |
| 831 | ch = readchar (timeout); |
| 832 | |
| 833 | if (ch < 0) |
| 834 | error ("ocd_get_packet (readchar): %d", ch); |
| 835 | *packet_ptr++ = ch; |
| 836 | checksum += ch; |
| 837 | |
| 838 | /* Get error code. */ |
| 839 | |
| 840 | ch = readchar (timeout); |
| 841 | |
| 842 | if (ch < 0) |
| 843 | error ("ocd_get_packet (readchar): %d", ch); |
| 844 | *packet_ptr++ = ch; |
| 845 | checksum += ch; |
| 846 | |
| 847 | switch (ch) /* Figure out length of packet */ |
| 848 | { |
| 849 | case 0x7: /* Write verify error? */ |
| 850 | len = 8; /* write address, value read back */ |
| 851 | break; |
| 852 | case 0x11: /* Bus error? */ |
| 853 | /* write address, read flag */ |
| 854 | case 0x15: /* Internal error */ |
| 855 | len = 5; /* error code, vector */ |
| 856 | break; |
| 857 | default: /* Error w/no params */ |
| 858 | len = 0; |
| 859 | break; |
| 860 | case 0x0: /* Normal result */ |
| 861 | switch (packet[0]) |
| 862 | { |
| 863 | case OCD_AYT: /* Are You There? */ |
| 864 | case OCD_SET_BAUD_RATE: /* Set Baud Rate */ |
| 865 | case OCD_INIT: /* Initialize OCD device */ |
| 866 | case OCD_SET_SPEED: /* Set Speed */ |
| 867 | case OCD_SET_FUNC_CODE: /* Set Function Code */ |
| 868 | case OCD_SET_CTL_FLAGS: /* Set Control Flags */ |
| 869 | case OCD_SET_BUF_ADDR: /* Set Register Buffer Address */ |
| 870 | case OCD_RUN: /* Run Target from PC */ |
| 871 | case OCD_RUN_ADDR: /* Run Target from Specified Address */ |
| 872 | case OCD_STOP: /* Stop Target */ |
| 873 | case OCD_RESET_RUN: /* Reset Target and Run */ |
| 874 | case OCD_RESET: /* Reset Target and Halt */ |
| 875 | case OCD_STEP: /* Single Step */ |
| 876 | case OCD_WRITE_REGS: /* Write Register */ |
| 877 | case OCD_WRITE_MEM: /* Write Memory */ |
| 878 | case OCD_FILL_MEM: /* Fill Memory */ |
| 879 | case OCD_MOVE_MEM: /* Move Memory */ |
| 880 | case OCD_WRITE_INT_MEM: /* Write Internal Memory */ |
| 881 | case OCD_JUMP: /* Jump to Subroutine */ |
| 882 | case OCD_ERASE_FLASH: /* Erase flash memory */ |
| 883 | case OCD_PROGRAM_FLASH: /* Write flash memory */ |
| 884 | case OCD_EXIT_MON: /* Exit the flash programming monitor */ |
| 885 | case OCD_ENTER_MON: /* Enter the flash programming monitor */ |
| 886 | case OCD_LOG_FILE: /* Make Wigglers.dll save Wigglers.log */ |
| 887 | case OCD_SET_CONNECTION: /* Set type of connection in Wigglers.dll */ |
| 888 | len = 0; |
| 889 | break; |
| 890 | case OCD_GET_VERSION: /* Get Version */ |
| 891 | len = 10; |
| 892 | break; |
| 893 | case OCD_GET_STATUS_MASK: /* Get Status Mask */ |
| 894 | len = 1; |
| 895 | break; |
| 896 | case OCD_GET_CTRS: /* Get Error Counters */ |
| 897 | case OCD_READ_REGS: /* Read Register */ |
| 898 | case OCD_READ_MEM: /* Read Memory */ |
| 899 | case OCD_READ_INT_MEM: /* Read Internal Memory */ |
| 900 | len = 257; |
| 901 | break; |
| 902 | default: |
| 903 | error ("ocd_get_packet: unknown packet type 0x%x\n", ch); |
| 904 | } |
| 905 | } |
| 906 | |
| 907 | if (len == 257) /* Byte stream? */ |
| 908 | { /* Yes, byte streams contain the length */ |
| 909 | ch = readchar (timeout); |
| 910 | |
| 911 | if (ch < 0) |
| 912 | error ("ocd_get_packet (readchar): %d", ch); |
| 913 | *packet_ptr++ = ch; |
| 914 | checksum += ch; |
| 915 | len = ch; |
| 916 | if (len == 0) |
| 917 | len = 256; |
| 918 | } |
| 919 | |
| 920 | while (len-- >= 0) /* Do rest of packet and checksum */ |
| 921 | { |
| 922 | ch = readchar (timeout); |
| 923 | |
| 924 | if (ch < 0) |
| 925 | error ("ocd_get_packet (readchar): %d", ch); |
| 926 | *packet_ptr++ = ch; |
| 927 | checksum += ch; |
| 928 | } |
| 929 | |
| 930 | if (checksum != 0) |
| 931 | error ("ocd_get_packet: bad packet checksum"); |
| 932 | |
| 933 | if (cmd != -1 && cmd != packet[0]) |
| 934 | error ("Response phase error. Got 0x%x, expected 0x%x", packet[0], cmd); |
| 935 | |
| 936 | *lenp = packet_ptr - packet - 1; /* Subtract checksum byte */ |
| 937 | return packet; |
| 938 | } |
| 939 | |
| 940 | /* Execute a simple (one-byte) command. Returns a pointer to the data |
| 941 | following the error code. */ |
| 942 | |
| 943 | static unsigned char * |
| 944 | ocd_do_command (int cmd, int *statusp, int *lenp) |
| 945 | { |
| 946 | unsigned char buf[100], *p; |
| 947 | int status, error_code; |
| 948 | char errbuf[100]; |
| 949 | |
| 950 | unsigned char logbuf[100]; |
| 951 | int logpktlen; |
| 952 | |
| 953 | buf[0] = cmd; |
| 954 | ocd_put_packet (buf, 1); /* Send command */ |
| 955 | p = ocd_get_packet (*buf, lenp, remote_timeout); |
| 956 | |
| 957 | if (*lenp < 3) |
| 958 | error ("Truncated response packet from OCD device"); |
| 959 | |
| 960 | status = p[1]; |
| 961 | error_code = p[2]; |
| 962 | |
| 963 | if (error_code != 0) |
| 964 | { |
| 965 | sprintf (errbuf, "ocd_do_command (0x%x):", cmd); |
| 966 | ocd_error (errbuf, error_code); |
| 967 | } |
| 968 | |
| 969 | if (status & OCD_FLAG_PWF) |
| 970 | error ("OCD device can't detect VCC at BDM interface."); |
| 971 | else if (status & OCD_FLAG_CABLE_DISC) |
| 972 | error ("BDM cable appears to be disconnected."); |
| 973 | |
| 974 | *statusp = status; |
| 975 | |
| 976 | logbuf[0] = OCD_LOG_FILE; |
| 977 | logbuf[1] = 3; /* close existing WIGGLERS.LOG */ |
| 978 | ocd_put_packet (logbuf, 2); |
| 979 | ocd_get_packet (logbuf[0], &logpktlen, remote_timeout); |
| 980 | |
| 981 | logbuf[0] = OCD_LOG_FILE; |
| 982 | logbuf[1] = 2; /* append to existing WIGGLERS.LOG */ |
| 983 | ocd_put_packet (logbuf, 2); |
| 984 | ocd_get_packet (logbuf[0], &logpktlen, remote_timeout); |
| 985 | |
| 986 | return p + 3; |
| 987 | } |
| 988 | \f |
| 989 | void |
| 990 | ocd_kill (void) |
| 991 | { |
| 992 | /* For some mysterious reason, wait_for_inferior calls kill instead of |
| 993 | mourn after it gets TARGET_WAITKIND_SIGNALLED. Work around it. */ |
| 994 | if (kill_kludge) |
| 995 | { |
| 996 | kill_kludge = 0; |
| 997 | target_mourn_inferior (); |
| 998 | return; |
| 999 | } |
| 1000 | |
| 1001 | /* Don't wait for it to die. I'm not really sure it matters whether |
| 1002 | we do or not. */ |
| 1003 | target_mourn_inferior (); |
| 1004 | } |
| 1005 | |
| 1006 | void |
| 1007 | ocd_mourn (void) |
| 1008 | { |
| 1009 | unpush_target (current_ops); |
| 1010 | generic_mourn_inferior (); |
| 1011 | } |
| 1012 | |
| 1013 | /* All we actually do is set the PC to the start address of exec_bfd, and start |
| 1014 | the program at that point. */ |
| 1015 | |
| 1016 | void |
| 1017 | ocd_create_inferior (char *exec_file, char *args, char **env) |
| 1018 | { |
| 1019 | if (args && (*args != '\000')) |
| 1020 | error ("Args are not supported by BDM."); |
| 1021 | |
| 1022 | clear_proceed_status (); |
| 1023 | proceed (bfd_get_start_address (exec_bfd), TARGET_SIGNAL_0, 0); |
| 1024 | } |
| 1025 | |
| 1026 | void |
| 1027 | ocd_load (char *args, int from_tty) |
| 1028 | { |
| 1029 | generic_load (args, from_tty); |
| 1030 | |
| 1031 | inferior_ptid = null_ptid; |
| 1032 | |
| 1033 | /* This is necessary because many things were based on the PC at the time that |
| 1034 | we attached to the monitor, which is no longer valid now that we have loaded |
| 1035 | new code (and just changed the PC). Another way to do this might be to call |
| 1036 | normal_stop, except that the stack may not be valid, and things would get |
| 1037 | horribly confused... */ |
| 1038 | |
| 1039 | clear_symtab_users (); |
| 1040 | } |
| 1041 | |
| 1042 | /* This should be defined for each target */ |
| 1043 | /* But we want to be able to compile this file for some configurations |
| 1044 | not yet supported fully */ |
| 1045 | |
| 1046 | #define BDM_BREAKPOINT {0x0,0x0,0x0,0x0} /* For ppc 8xx */ |
| 1047 | |
| 1048 | /* BDM (at least on CPU32) uses a different breakpoint */ |
| 1049 | |
| 1050 | int |
| 1051 | ocd_insert_breakpoint (CORE_ADDR addr, char *contents_cache) |
| 1052 | { |
| 1053 | static char break_insn[] = BDM_BREAKPOINT; |
| 1054 | int val; |
| 1055 | |
| 1056 | val = target_read_memory (addr, contents_cache, sizeof (break_insn)); |
| 1057 | |
| 1058 | if (val == 0) |
| 1059 | val = target_write_memory (addr, break_insn, sizeof (break_insn)); |
| 1060 | |
| 1061 | return val; |
| 1062 | } |
| 1063 | |
| 1064 | int |
| 1065 | ocd_remove_breakpoint (CORE_ADDR addr, char *contents_cache) |
| 1066 | { |
| 1067 | static char break_insn[] = BDM_BREAKPOINT; |
| 1068 | int val; |
| 1069 | |
| 1070 | val = target_write_memory (addr, contents_cache, sizeof (break_insn)); |
| 1071 | |
| 1072 | return val; |
| 1073 | } |
| 1074 | |
| 1075 | static void |
| 1076 | bdm_command (char *args, int from_tty) |
| 1077 | { |
| 1078 | error ("bdm command must be followed by `reset'"); |
| 1079 | } |
| 1080 | |
| 1081 | static void |
| 1082 | bdm_reset_command (char *args, int from_tty) |
| 1083 | { |
| 1084 | int status, pktlen; |
| 1085 | |
| 1086 | if (!ocd_desc) |
| 1087 | error ("Not connected to OCD device."); |
| 1088 | |
| 1089 | ocd_do_command (OCD_RESET, &status, &pktlen); |
| 1090 | dcache_invalidate (target_dcache); |
| 1091 | registers_changed (); |
| 1092 | } |
| 1093 | |
| 1094 | static void |
| 1095 | bdm_restart_command (char *args, int from_tty) |
| 1096 | { |
| 1097 | int status, pktlen; |
| 1098 | |
| 1099 | if (!ocd_desc) |
| 1100 | error ("Not connected to OCD device."); |
| 1101 | |
| 1102 | ocd_do_command (OCD_RESET_RUN, &status, &pktlen); |
| 1103 | last_run_status = status; |
| 1104 | clear_proceed_status (); |
| 1105 | wait_for_inferior (); |
| 1106 | normal_stop (); |
| 1107 | } |
| 1108 | |
| 1109 | /* Temporary replacement for target_store_registers(). This prevents |
| 1110 | generic_load from trying to set the PC. */ |
| 1111 | |
| 1112 | static void |
| 1113 | noop_store_registers (int regno) |
| 1114 | { |
| 1115 | } |
| 1116 | |
| 1117 | static void |
| 1118 | bdm_update_flash_command (char *args, int from_tty) |
| 1119 | { |
| 1120 | int status, pktlen; |
| 1121 | struct cleanup *old_chain; |
| 1122 | void (*store_registers_tmp) (int); |
| 1123 | |
| 1124 | if (!ocd_desc) |
| 1125 | error ("Not connected to OCD device."); |
| 1126 | |
| 1127 | if (!args) |
| 1128 | error ("Must specify file containing new OCD code."); |
| 1129 | |
| 1130 | /* old_chain = make_cleanup (flash_cleanup, 0); */ |
| 1131 | |
| 1132 | ocd_do_command (OCD_ENTER_MON, &status, &pktlen); |
| 1133 | |
| 1134 | ocd_do_command (OCD_ERASE_FLASH, &status, &pktlen); |
| 1135 | |
| 1136 | write_mem_command = OCD_PROGRAM_FLASH; |
| 1137 | store_registers_tmp = current_target.to_store_registers; |
| 1138 | current_target.to_store_registers = noop_store_registers; |
| 1139 | |
| 1140 | generic_load (args, from_tty); |
| 1141 | |
| 1142 | current_target.to_store_registers = store_registers_tmp; |
| 1143 | write_mem_command = OCD_WRITE_MEM; |
| 1144 | |
| 1145 | ocd_do_command (OCD_EXIT_MON, &status, &pktlen); |
| 1146 | |
| 1147 | /* discard_cleanups (old_chain); */ |
| 1148 | } |
| 1149 | \f |
| 1150 | extern initialize_file_ftype _initialize_remote_ocd; /* -Wmissing-prototypes */ |
| 1151 | |
| 1152 | void |
| 1153 | _initialize_remote_ocd (void) |
| 1154 | { |
| 1155 | extern struct cmd_list_element *cmdlist; |
| 1156 | static struct cmd_list_element *ocd_cmd_list = NULL; |
| 1157 | |
| 1158 | add_show_from_set (add_set_cmd ("remotetimeout", no_class, |
| 1159 | var_integer, (char *) &remote_timeout, |
| 1160 | "Set timeout value for remote read.\n", &setlist), |
| 1161 | &showlist); |
| 1162 | |
| 1163 | add_prefix_cmd ("ocd", class_obscure, bdm_command, "", &ocd_cmd_list, "ocd ", |
| 1164 | 0, &cmdlist); |
| 1165 | |
| 1166 | add_cmd ("reset", class_obscure, bdm_reset_command, "", &ocd_cmd_list); |
| 1167 | add_cmd ("restart", class_obscure, bdm_restart_command, "", &ocd_cmd_list); |
| 1168 | add_cmd ("update-flash", class_obscure, bdm_update_flash_command, "", &ocd_cmd_list); |
| 1169 | } |