1 /* Remote debugging interface for MIPS remote debugging protocol. 2 Copyright 1993, 1994, 1995 Free Software Foundation, Inc. 3 Contributed by Cygnus Support. Written by Ian Lance Taylor 4 <ian@cygnus.com>. 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, Boston, MA 02111-1307, USA. */ 21 22 #include "defs.h" 23 #include "inferior.h" 24 #include "bfd.h" 25 #include "symfile.h" 26 #include "wait.h" 27 #include "gdbcmd.h" 28 #include "gdbcore.h" 29 #include "serial.h" 30 #include "target.h" 31 #include "remote-utils.h" 32 33 #include <signal.h> 34 #ifdef ANSI_PROTOTYPES 35 #include <stdarg.h> 36 #else 37 #include <varargs.h> 38 #endif 39 40 extern void mips_set_processor_type_command PARAMS ((char *, int)); 41 42 43 /* Prototypes for local functions. */ 44 45 static int mips_readchar PARAMS ((int timeout)); 46 47 static int mips_receive_header PARAMS ((unsigned char *hdr, int *pgarbage, 48 int ch, int timeout)); 49 50 static int mips_receive_trailer PARAMS ((unsigned char *trlr, int *pgarbage, 51 int *pch, int timeout)); 52 53 static int mips_cksum PARAMS ((const unsigned char *hdr, 54 const unsigned char *data, 55 int len)); 56 57 static void mips_send_packet PARAMS ((const char *s, int get_ack)); 58 59 static void mips_send_command PARAMS ((const char *cmd, int prompt)); 60 61 static int mips_receive_packet PARAMS ((char *buff, int throw_error, 62 int timeout)); 63 64 static CORE_ADDR mips_request PARAMS ((int cmd, CORE_ADDR addr, 65 CORE_ADDR data, int *perr, int timeout, 66 char *buff)); 67 68 static void mips_initialize PARAMS ((void)); 69 70 static void mips_open PARAMS ((char *name, int from_tty)); 71 72 static void pmon_open PARAMS ((char *name, int from_tty)); 73 74 static void ddb_open PARAMS ((char *name, int from_tty)); 75 76 static void mips_close PARAMS ((int quitting)); 77 78 static void mips_detach PARAMS ((char *args, int from_tty)); 79 80 static void mips_resume PARAMS ((int pid, int step, 81 enum target_signal siggnal)); 82 83 static int mips_wait PARAMS ((int pid, struct target_waitstatus *status)); 84 85 static int pmon_wait PARAMS ((int pid, struct target_waitstatus *status)); 86 87 static int mips_map_regno PARAMS ((int regno)); 88 89 static void mips_fetch_registers PARAMS ((int regno)); 90 91 static void mips_prepare_to_store PARAMS ((void)); 92 93 static void mips_store_registers PARAMS ((int regno)); 94 95 static unsigned int mips_fetch_word PARAMS ((CORE_ADDR addr)); 96 97 static int mips_store_word PARAMS ((CORE_ADDR addr, unsigned int value, 98 char *old_contents)); 99 100 static int mips_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, int len, 101 int write, struct target_ops *ignore)); 102 103 static void mips_files_info PARAMS ((struct target_ops *ignore)); 104 105 static void mips_create_inferior PARAMS ((char *execfile, char *args, 106 char **env)); 107 108 static void mips_mourn_inferior PARAMS ((void)); 109 110 static int pmon_makeb64 PARAMS ((unsigned long v, char *p, int n, int *chksum)); 111 112 static int pmon_zeroset PARAMS ((int recsize, char **buff, int *amount, 113 unsigned int *chksum)); 114 115 static int pmon_checkset PARAMS ((int recsize, char **buff, int *value)); 116 117 static void pmon_make_fastrec PARAMS ((char **outbuf, unsigned char *inbuf, 118 int *inptr, int inamount, int *recsize, 119 unsigned int *csum, unsigned int *zerofill)); 120 121 static int pmon_check_ack PARAMS ((void)); 122 123 static void pmon_load_fast PARAMS ((char *file)); 124 125 static void mips_load PARAMS ((char *file, int from_tty)); 126 127 static int mips_make_srec PARAMS ((char *buffer, int type, CORE_ADDR memaddr, 128 unsigned char *myaddr, int len)); 129 130 static int common_breakpoint PARAMS ((int cmd, CORE_ADDR addr, CORE_ADDR mask, 131 char *flags)); 132 133 static void common_open PARAMS ((struct target_ops *ops, char *name, 134 int from_tty)); 135 /* Forward declarations. */ 136 extern struct target_ops mips_ops; 137 extern struct target_ops pmon_ops; 138 extern struct target_ops ddb_ops; 139 140 /* The MIPS remote debugging interface is built on top of a simple 141 packet protocol. Each packet is organized as follows: 142 143 SYN The first character is always a SYN (ASCII 026, or ^V). SYN 144 may not appear anywhere else in the packet. Any time a SYN is 145 seen, a new packet should be assumed to have begun. 146 147 TYPE_LEN 148 This byte contains the upper five bits of the logical length 149 of the data section, plus a single bit indicating whether this 150 is a data packet or an acknowledgement. The documentation 151 indicates that this bit is 1 for a data packet, but the actual 152 board uses 1 for an acknowledgement. The value of the byte is 153 0x40 + (ack ? 0x20 : 0) + (len >> 6) 154 (we always have 0 <= len < 1024). Acknowledgement packets do 155 not carry data, and must have a data length of 0. 156 157 LEN1 This byte contains the lower six bits of the logical length of 158 the data section. The value is 159 0x40 + (len & 0x3f) 160 161 SEQ This byte contains the six bit sequence number of the packet. 162 The value is 163 0x40 + seq 164 An acknowlegment packet contains the sequence number of the 165 packet being acknowledged plus 1 modulo 64. Data packets are 166 transmitted in sequence. There may only be one outstanding 167 unacknowledged data packet at a time. The sequence numbers 168 are independent in each direction. If an acknowledgement for 169 the previous packet is received (i.e., an acknowledgement with 170 the sequence number of the packet just sent) the packet just 171 sent should be retransmitted. If no acknowledgement is 172 received within a timeout period, the packet should be 173 retransmitted. This has an unfortunate failure condition on a 174 high-latency line, as a delayed acknowledgement may lead to an 175 endless series of duplicate packets. 176 177 DATA The actual data bytes follow. The following characters are 178 escaped inline with DLE (ASCII 020, or ^P): 179 SYN (026) DLE S 180 DLE (020) DLE D 181 ^C (003) DLE C 182 ^S (023) DLE s 183 ^Q (021) DLE q 184 The additional DLE characters are not counted in the logical 185 length stored in the TYPE_LEN and LEN1 bytes. 186 187 CSUM1 188 CSUM2 189 CSUM3 190 These bytes contain an 18 bit checksum of the complete 191 contents of the packet excluding the SEQ byte and the 192 CSUM[123] bytes. The checksum is simply the twos complement 193 addition of all the bytes treated as unsigned characters. The 194 values of the checksum bytes are: 195 CSUM1: 0x40 + ((cksum >> 12) & 0x3f) 196 CSUM2: 0x40 + ((cksum >> 6) & 0x3f) 197 CSUM3: 0x40 + (cksum & 0x3f) 198 199 It happens that the MIPS remote debugging protocol always 200 communicates with ASCII strings. Because of this, this 201 implementation doesn't bother to handle the DLE quoting mechanism, 202 since it will never be required. */ 203 204 /* The SYN character which starts each packet. */ 205 #define SYN '\026' 206 207 /* The 0x40 used to offset each packet (this value ensures that all of 208 the header and trailer bytes, other than SYN, are printable ASCII 209 characters). */ 210 #define HDR_OFFSET 0x40 211 212 /* The indices of the bytes in the packet header. */ 213 #define HDR_INDX_SYN 0 214 #define HDR_INDX_TYPE_LEN 1 215 #define HDR_INDX_LEN1 2 216 #define HDR_INDX_SEQ 3 217 #define HDR_LENGTH 4 218 219 /* The data/ack bit in the TYPE_LEN header byte. */ 220 #define TYPE_LEN_DA_BIT 0x20 221 #define TYPE_LEN_DATA 0 222 #define TYPE_LEN_ACK TYPE_LEN_DA_BIT 223 224 /* How to compute the header bytes. */ 225 #define HDR_SET_SYN(data, len, seq) (SYN) 226 #define HDR_SET_TYPE_LEN(data, len, seq) \ 227 (HDR_OFFSET \ 228 + ((data) ? TYPE_LEN_DATA : TYPE_LEN_ACK) \ 229 + (((len) >> 6) & 0x1f)) 230 #define HDR_SET_LEN1(data, len, seq) (HDR_OFFSET + ((len) & 0x3f)) 231 #define HDR_SET_SEQ(data, len, seq) (HDR_OFFSET + (seq)) 232 233 /* Check that a header byte is reasonable. */ 234 #define HDR_CHECK(ch) (((ch) & HDR_OFFSET) == HDR_OFFSET) 235 236 /* Get data from the header. These macros evaluate their argument 237 multiple times. */ 238 #define HDR_IS_DATA(hdr) \ 239 (((hdr)[HDR_INDX_TYPE_LEN] & TYPE_LEN_DA_BIT) == TYPE_LEN_DATA) 240 #define HDR_GET_LEN(hdr) \ 241 ((((hdr)[HDR_INDX_TYPE_LEN] & 0x1f) << 6) + (((hdr)[HDR_INDX_LEN1] & 0x3f))) 242 #define HDR_GET_SEQ(hdr) ((hdr)[HDR_INDX_SEQ] & 0x3f) 243 244 /* The maximum data length. */ 245 #define DATA_MAXLEN 1023 246 247 /* The trailer offset. */ 248 #define TRLR_OFFSET HDR_OFFSET 249 250 /* The indices of the bytes in the packet trailer. */ 251 #define TRLR_INDX_CSUM1 0 252 #define TRLR_INDX_CSUM2 1 253 #define TRLR_INDX_CSUM3 2 254 #define TRLR_LENGTH 3 255 256 /* How to compute the trailer bytes. */ 257 #define TRLR_SET_CSUM1(cksum) (TRLR_OFFSET + (((cksum) >> 12) & 0x3f)) 258 #define TRLR_SET_CSUM2(cksum) (TRLR_OFFSET + (((cksum) >> 6) & 0x3f)) 259 #define TRLR_SET_CSUM3(cksum) (TRLR_OFFSET + (((cksum) ) & 0x3f)) 260 261 /* Check that a trailer byte is reasonable. */ 262 #define TRLR_CHECK(ch) (((ch) & TRLR_OFFSET) == TRLR_OFFSET) 263 264 /* Get data from the trailer. This evaluates its argument multiple 265 times. */ 266 #define TRLR_GET_CKSUM(trlr) \ 267 ((((trlr)[TRLR_INDX_CSUM1] & 0x3f) << 12) \ 268 + (((trlr)[TRLR_INDX_CSUM2] & 0x3f) << 6) \ 269 + ((trlr)[TRLR_INDX_CSUM3] & 0x3f)) 270 271 /* The sequence number modulos. */ 272 #define SEQ_MODULOS (64) 273 274 enum mips_monitor_type { 275 /* IDT/SIM monitor being used: */ 276 MON_IDT, 277 /* PMON monitor being used: */ 278 MON_PMON, /* 3.0.83 [COGENT,EB,FP,NET] Algorithmics Ltd. Nov 9 1995 17:19:50 */ 279 MON_DDB, /* 2.7.473 [DDBVR4300,EL,FP,NET] Risq Modular Systems, Thu Jun 6 09:28:40 PDT 1996 */ 280 /* Last and unused value, for sizing vectors, etc. */ 281 MON_LAST 282 }; 283 static enum mips_monitor_type mips_monitor = MON_LAST; 284 285 /* The default monitor prompt text: */ 286 static char *mips_monitor_prompt = TARGET_MONITOR_PROMPT; 287 /* For the Cogent PMON world this is still not ideal. The default 288 prompt is "PMON> ", unfortunately the user can change the prompt 289 and the new prompt will survive over a power-cycle (EEPROM). This 290 means that the code should really force the monitor prompt to a 291 known value as the very first action, and that the 292 "mips_monitor_prompt" support is not needed... since the prompt 293 could be explicitly set to TARGET_MONITOR_PROMPT (even though it 294 may be the prompt for a different monitor). However, this will 295 require changing the mips_initialize reset sequence. (TODO) */ 296 297 /* Set to 1 if the target is open. */ 298 static int mips_is_open; 299 300 /* Currently active target description (if mips_is_open == 1) */ 301 static struct target_ops *current_ops; 302 303 /* Set to 1 while the connection is being initialized. */ 304 static int mips_initializing; 305 306 /* The next sequence number to send. */ 307 static unsigned int mips_send_seq; 308 309 /* The next sequence number we expect to receive. */ 310 static unsigned int mips_receive_seq; 311 312 /* The time to wait before retransmitting a packet, in seconds. */ 313 static int mips_retransmit_wait = 3; 314 315 /* The number of times to try retransmitting a packet before giving up. */ 316 static int mips_send_retries = 10; 317 318 /* The number of garbage characters to accept when looking for an 319 SYN for the next packet. */ 320 static int mips_syn_garbage = 1050; 321 322 /* The time to wait for a packet, in seconds. */ 323 static int mips_receive_wait = 5; 324 325 /* Set if we have sent a packet to the board but have not yet received 326 a reply. */ 327 static int mips_need_reply = 0; 328 329 /* Handle used to access serial I/O stream. */ 330 static serial_t mips_desc; 331 332 /* Counts the number of times the user tried to interrupt the target (usually 333 via ^C. */ 334 static int interrupt_count; 335 336 /* If non-zero, means that the target is running. */ 337 static int mips_wait_flag = 0; 338 339 /* If non-zero, monitor supports breakpoint commands. */ 340 static monitor_supports_breakpoints = 0; 341 342 /* Data cache header. */ 343 344 static DCACHE *mips_dcache; 345 346 /* Non-zero means that we've just hit a read or write watchpoint */ 347 static int hit_watchpoint; 348 349 /* Handle low-level error that we can't recover from. Note that just 350 error()ing out from target_wait or some such low-level place will cause 351 all hell to break loose--the rest of GDB will tend to get left in an 352 inconsistent state. */ 353 354 static NORETURN void 355 #ifdef ANSI_PROTOTYPES 356 mips_error (char *string, ...) 357 #else 358 mips_error (va_alist) 359 va_dcl 360 #endif 361 { 362 va_list args; 363 364 #ifdef ANSI_PROTOTYPES 365 va_start (args, string); 366 #else 367 char *string; 368 va_start (args); 369 string = va_arg (args, char *); 370 #endif 371 372 target_terminal_ours (); 373 wrap_here(""); /* Force out any buffered output */ 374 gdb_flush (gdb_stdout); 375 if (error_pre_print) 376 fprintf_filtered (gdb_stderr, error_pre_print); 377 vfprintf_filtered (gdb_stderr, string, args); 378 fprintf_filtered (gdb_stderr, "\n"); 379 va_end (args); 380 gdb_flush (gdb_stderr); 381 382 /* Clean up in such a way that mips_close won't try to talk to the 383 board (it almost surely won't work since we weren't able to talk to 384 it). */ 385 mips_is_open = 0; 386 SERIAL_CLOSE (mips_desc); 387 388 printf_unfiltered ("Ending remote MIPS debugging.\n"); 389 target_mourn_inferior (); 390 391 return_to_top_level (RETURN_ERROR); 392 } 393 394 /* Wait until STRING shows up in mips_desc. Returns 1 if successful, else 0 if 395 timed out. */ 396 397 int 398 mips_expect (string) 399 char *string; 400 { 401 char *p = string; 402 403 immediate_quit = 1; 404 while (1) 405 { 406 int c; 407 408 /* Must use SERIAL_READCHAR here cuz mips_readchar would get confused if we 409 were waiting for the mips_monitor_prompt... */ 410 411 c = SERIAL_READCHAR (mips_desc, 2); 412 413 if (c == SERIAL_TIMEOUT) 414 return 0; 415 416 if (c == *p++) 417 { 418 if (*p == '\0') 419 { 420 immediate_quit = 0; 421 return 1; 422 } 423 } 424 else 425 { 426 p = string; 427 if (c == *p) 428 p++; 429 } 430 } 431 } 432 433 /* Read the required number of characters into the given buffer (which 434 is assumed to be large enough). The only failure is a timeout. */ 435 int 436 mips_getstring (string, n) 437 char *string; 438 int n; 439 { 440 char *p = string; 441 int c; 442 443 immediate_quit = 1; 444 while (n > 0) 445 { 446 c = SERIAL_READCHAR (mips_desc, 2); 447 448 if (c == SERIAL_TIMEOUT) { 449 fprintf_unfiltered (stderr, "Failed to read %d characters from target (TIMEOUT)\n", n); 450 return 0; 451 } 452 453 *p++ = c; 454 n--; 455 } 456 457 return 1; 458 } 459 460 /* Read a character from the remote, aborting on error. Returns 461 SERIAL_TIMEOUT on timeout (since that's what SERIAL_READCHAR 462 returns). FIXME: If we see the string mips_monitor_prompt from 463 the board, then we are debugging on the main console port, and we 464 have somehow dropped out of remote debugging mode. In this case, 465 we automatically go back in to remote debugging mode. This is a 466 hack, put in because I can't find any way for a program running on 467 the remote board to terminate without also ending remote debugging 468 mode. I assume users won't have any trouble with this; for one 469 thing, the IDT documentation generally assumes that the remote 470 debugging port is not the console port. This is, however, very 471 convenient for DejaGnu when you only have one connected serial 472 port. */ 473 474 static int 475 mips_readchar (timeout) 476 int timeout; 477 { 478 int ch; 479 static int state = 0; 480 static int mips_monitor_prompt_len = -1; 481 482 /* NASTY, since we assume that the prompt does not change after the 483 first mips_readchar call: */ 484 if (mips_monitor_prompt_len = -1) 485 mips_monitor_prompt_len = strlen(mips_monitor_prompt); 486 487 #ifdef MAINTENANCE_CMDS 488 { 489 int i; 490 491 i = timeout; 492 if (i == -1 && watchdog > 0) 493 i = watchdog; 494 } 495 #endif 496 497 if (state == mips_monitor_prompt_len) 498 timeout = 1; 499 ch = SERIAL_READCHAR (mips_desc, timeout); 500 #ifdef MAINTENANCE_CMDS 501 if (ch == SERIAL_TIMEOUT && timeout == -1) /* Watchdog went off */ 502 { 503 target_mourn_inferior (); 504 error ("Watchdog has expired. Target detached.\n"); 505 } 506 #endif 507 if (ch == SERIAL_EOF) 508 mips_error ("End of file from remote"); 509 if (ch == SERIAL_ERROR) 510 mips_error ("Error reading from remote: %s", safe_strerror (errno)); 511 if (remote_debug > 1) 512 { 513 /* Don't use _filtered; we can't deal with a QUIT out of 514 target_wait, and I think this might be called from there. */ 515 if (ch != SERIAL_TIMEOUT) 516 printf_unfiltered ("Read '%c' %d 0x%x\n", ch, ch, ch); 517 else 518 printf_unfiltered ("Timed out in read\n"); 519 } 520 521 /* If we have seen mips_monitor_prompt and we either time out, or 522 we see a @ (which was echoed from a packet we sent), reset the 523 board as described above. The first character in a packet after 524 the SYN (which is not echoed) is always an @ unless the packet is 525 more than 64 characters long, which ours never are. */ 526 if ((ch == SERIAL_TIMEOUT || ch == '@') 527 && state == mips_monitor_prompt_len 528 && ! mips_initializing) 529 { 530 if (remote_debug > 0) 531 /* Don't use _filtered; we can't deal with a QUIT out of 532 target_wait, and I think this might be called from there. */ 533 printf_unfiltered ("Reinitializing MIPS debugging mode\n"); 534 535 mips_need_reply = 0; 536 mips_initialize (); 537 538 state = 0; 539 540 /* At this point, about the only thing we can do is abort the command 541 in progress and get back to command level as quickly as possible. */ 542 543 error ("Remote board reset, debug protocol re-initialized."); 544 } 545 546 if (ch == mips_monitor_prompt[state]) 547 ++state; 548 else 549 state = 0; 550 551 return ch; 552 } 553 554 /* Get a packet header, putting the data in the supplied buffer. 555 PGARBAGE is a pointer to the number of garbage characters received 556 so far. CH is the last character received. Returns 0 for success, 557 or -1 for timeout. */ 558 559 static int 560 mips_receive_header (hdr, pgarbage, ch, timeout) 561 unsigned char *hdr; 562 int *pgarbage; 563 int ch; 564 int timeout; 565 { 566 int i; 567 568 while (1) 569 { 570 /* Wait for a SYN. mips_syn_garbage is intended to prevent 571 sitting here indefinitely if the board sends us one garbage 572 character per second. ch may already have a value from the 573 last time through the loop. */ 574 while (ch != SYN) 575 { 576 ch = mips_readchar (timeout); 577 if (ch == SERIAL_TIMEOUT) 578 return -1; 579 if (ch != SYN) 580 { 581 /* Printing the character here lets the user of gdb see 582 what the program is outputting, if the debugging is 583 being done on the console port. Don't use _filtered; 584 we can't deal with a QUIT out of target_wait. */ 585 if (! mips_initializing || remote_debug > 0) 586 { 587 /* Note that the host's idea of newline may not 588 correspond to the target's idea, so recognize 589 newline by its actual ASCII code, but write it 590 out using the \n notation. */ 591 if (ch < 0x20 && ch != '\012') 592 { 593 putchar_unfiltered ('^'); 594 putchar_unfiltered (ch + 0x40); 595 } 596 else if (ch == '\012') 597 putchar_unfiltered ('\n'); 598 else 599 putchar_unfiltered (ch); 600 gdb_flush (gdb_stdout); 601 } 602 603 ++*pgarbage; 604 if (mips_syn_garbage > 0 605 && *pgarbage > mips_syn_garbage) 606 mips_error ("Debug protocol failure: more than %d characters before a sync.", 607 mips_syn_garbage); 608 } 609 } 610 611 /* Get the packet header following the SYN. */ 612 for (i = 1; i < HDR_LENGTH; i++) 613 { 614 ch = mips_readchar (timeout); 615 if (ch == SERIAL_TIMEOUT) 616 return -1; 617 /* Make sure this is a header byte. */ 618 if (ch == SYN || ! HDR_CHECK (ch)) 619 break; 620 621 hdr[i] = ch; 622 } 623 624 /* If we got the complete header, we can return. Otherwise we 625 loop around and keep looking for SYN. */ 626 if (i >= HDR_LENGTH) 627 return 0; 628 } 629 } 630 631 /* Get a packet header, putting the data in the supplied buffer. 632 PGARBAGE is a pointer to the number of garbage characters received 633 so far. The last character read is returned in *PCH. Returns 0 634 for success, -1 for timeout, -2 for error. */ 635 636 static int 637 mips_receive_trailer (trlr, pgarbage, pch, timeout) 638 unsigned char *trlr; 639 int *pgarbage; 640 int *pch; 641 int timeout; 642 { 643 int i; 644 int ch; 645 646 for (i = 0; i < TRLR_LENGTH; i++) 647 { 648 ch = mips_readchar (timeout); 649 *pch = ch; 650 if (ch == SERIAL_TIMEOUT) 651 return -1; 652 if (! TRLR_CHECK (ch)) 653 return -2; 654 trlr[i] = ch; 655 } 656 return 0; 657 } 658 659 /* Get the checksum of a packet. HDR points to the packet header. 660 DATA points to the packet data. LEN is the length of DATA. */ 661 662 static int 663 mips_cksum (hdr, data, len) 664 const unsigned char *hdr; 665 const unsigned char *data; 666 int len; 667 { 668 register const unsigned char *p; 669 register int c; 670 register int cksum; 671 672 cksum = 0; 673 674 /* The initial SYN is not included in the checksum. */ 675 c = HDR_LENGTH - 1; 676 p = hdr + 1; 677 while (c-- != 0) 678 cksum += *p++; 679 680 c = len; 681 p = data; 682 while (c-- != 0) 683 cksum += *p++; 684 685 return cksum; 686 } 687 688 /* Send a packet containing the given ASCII string. */ 689 690 static void 691 mips_send_packet (s, get_ack) 692 const char *s; 693 int get_ack; 694 { 695 unsigned int len; 696 unsigned char *packet; 697 register int cksum; 698 int try; 699 700 len = strlen (s); 701 if (len > DATA_MAXLEN) 702 mips_error ("MIPS protocol data packet too long: %s", s); 703 704 packet = (unsigned char *) alloca (HDR_LENGTH + len + TRLR_LENGTH + 1); 705 706 packet[HDR_INDX_SYN] = HDR_SET_SYN (1, len, mips_send_seq); 707 packet[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (1, len, mips_send_seq); 708 packet[HDR_INDX_LEN1] = HDR_SET_LEN1 (1, len, mips_send_seq); 709 packet[HDR_INDX_SEQ] = HDR_SET_SEQ (1, len, mips_send_seq); 710 711 memcpy (packet + HDR_LENGTH, s, len); 712 713 cksum = mips_cksum (packet, packet + HDR_LENGTH, len); 714 packet[HDR_LENGTH + len + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum); 715 packet[HDR_LENGTH + len + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum); 716 packet[HDR_LENGTH + len + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum); 717 718 /* Increment the sequence number. This will set mips_send_seq to 719 the sequence number we expect in the acknowledgement. */ 720 mips_send_seq = (mips_send_seq + 1) % SEQ_MODULOS; 721 722 /* We can only have one outstanding data packet, so we just wait for 723 the acknowledgement here. Keep retransmitting the packet until 724 we get one, or until we've tried too many times. */ 725 for (try = 0; try < mips_send_retries; try++) 726 { 727 int garbage; 728 int ch; 729 730 if (remote_debug > 0) 731 { 732 /* Don't use _filtered; we can't deal with a QUIT out of 733 target_wait, and I think this might be called from there. */ 734 packet[HDR_LENGTH + len + TRLR_LENGTH] = '\0'; 735 printf_unfiltered ("Writing \"%s\"\n", packet + 1); 736 } 737 738 if (SERIAL_WRITE (mips_desc, packet, 739 HDR_LENGTH + len + TRLR_LENGTH) != 0) 740 mips_error ("write to target failed: %s", safe_strerror (errno)); 741 742 if (! get_ack) 743 return; 744 745 garbage = 0; 746 ch = 0; 747 while (1) 748 { 749 unsigned char hdr[HDR_LENGTH + 1]; 750 unsigned char trlr[TRLR_LENGTH + 1]; 751 int err; 752 int seq; 753 754 /* Get the packet header. If we time out, resend the data 755 packet. */ 756 err = mips_receive_header (hdr, &garbage, ch, mips_retransmit_wait); 757 if (err != 0) 758 break; 759 760 ch = 0; 761 762 /* If we get a data packet, assume it is a duplicate and 763 ignore it. FIXME: If the acknowledgement is lost, this 764 data packet may be the packet the remote sends after the 765 acknowledgement. */ 766 if (HDR_IS_DATA (hdr)) { 767 int i; 768 769 /* Ignore any errors raised whilst attempting to ignore 770 packet. */ 771 772 len = HDR_GET_LEN (hdr); 773 774 for (i = 0; i < len; i++) 775 { 776 int rch; 777 778 rch = mips_readchar (2); 779 if (rch == SYN) 780 { 781 ch = SYN; 782 break; 783 } 784 if (rch == SERIAL_TIMEOUT) 785 break; 786 /* ignore the character */ 787 } 788 789 if (i == len) 790 (void) mips_receive_trailer (trlr, &garbage, &ch, 2); 791 792 /* We don't bother checking the checksum, or providing an 793 ACK to the packet. */ 794 continue; 795 } 796 797 /* If the length is not 0, this is a garbled packet. */ 798 if (HDR_GET_LEN (hdr) != 0) 799 continue; 800 801 /* Get the packet trailer. */ 802 err = mips_receive_trailer (trlr, &garbage, &ch, 803 mips_retransmit_wait); 804 805 /* If we timed out, resend the data packet. */ 806 if (err == -1) 807 break; 808 809 /* If we got a bad character, reread the header. */ 810 if (err != 0) 811 continue; 812 813 /* If the checksum does not match the trailer checksum, this 814 is a bad packet; ignore it. */ 815 if (mips_cksum (hdr, (unsigned char *) NULL, 0) 816 != TRLR_GET_CKSUM (trlr)) 817 continue; 818 819 if (remote_debug > 0) 820 { 821 hdr[HDR_LENGTH] = '\0'; 822 trlr[TRLR_LENGTH] = '\0'; 823 /* Don't use _filtered; we can't deal with a QUIT out of 824 target_wait, and I think this might be called from there. */ 825 printf_unfiltered ("Got ack %d \"%s%s\"\n", 826 HDR_GET_SEQ (hdr), hdr + 1, trlr); 827 } 828 829 /* If this ack is for the current packet, we're done. */ 830 seq = HDR_GET_SEQ (hdr); 831 if (seq == mips_send_seq) 832 return; 833 834 /* If this ack is for the last packet, resend the current 835 packet. */ 836 if ((seq + 1) % SEQ_MODULOS == mips_send_seq) 837 break; 838 839 /* Otherwise this is a bad ack; ignore it. Increment the 840 garbage count to ensure that we do not stay in this loop 841 forever. */ 842 ++garbage; 843 } 844 } 845 846 mips_error ("Remote did not acknowledge packet"); 847 } 848 849 /* Receive and acknowledge a packet, returning the data in BUFF (which 850 should be DATA_MAXLEN + 1 bytes). The protocol documentation 851 implies that only the sender retransmits packets, so this code just 852 waits silently for a packet. It returns the length of the received 853 packet. If THROW_ERROR is nonzero, call error() on errors. If not, 854 don't print an error message and return -1. */ 855 856 static int 857 mips_receive_packet (buff, throw_error, timeout) 858 char *buff; 859 int throw_error; 860 int timeout; 861 { 862 int ch; 863 int garbage; 864 int len; 865 unsigned char ack[HDR_LENGTH + TRLR_LENGTH + 1]; 866 int cksum; 867 868 ch = 0; 869 garbage = 0; 870 while (1) 871 { 872 unsigned char hdr[HDR_LENGTH]; 873 unsigned char trlr[TRLR_LENGTH]; 874 int i; 875 int err; 876 877 if (mips_receive_header (hdr, &garbage, ch, timeout) != 0) 878 { 879 if (throw_error) 880 mips_error ("Timed out waiting for remote packet"); 881 else 882 return -1; 883 } 884 885 ch = 0; 886 887 /* An acknowledgement is probably a duplicate; ignore it. */ 888 if (! HDR_IS_DATA (hdr)) 889 { 890 len = HDR_GET_LEN (hdr); 891 /* Check if the length is valid for an ACK, we may aswell 892 try and read the remainder of the packet: */ 893 if (len == 0) 894 { 895 /* Ignore the error condition, since we are going to 896 ignore the packet anyway. */ 897 (void) mips_receive_trailer (trlr, &garbage, &ch, timeout); 898 } 899 /* Don't use _filtered; we can't deal with a QUIT out of 900 target_wait, and I think this might be called from there. */ 901 if (remote_debug > 0) 902 printf_unfiltered ("Ignoring unexpected ACK\n"); 903 continue; 904 } 905 906 len = HDR_GET_LEN (hdr); 907 for (i = 0; i < len; i++) 908 { 909 int rch; 910 911 rch = mips_readchar (timeout); 912 if (rch == SYN) 913 { 914 ch = SYN; 915 break; 916 } 917 if (rch == SERIAL_TIMEOUT) 918 { 919 if (throw_error) 920 mips_error ("Timed out waiting for remote packet"); 921 else 922 return -1; 923 } 924 buff[i] = rch; 925 } 926 927 if (i < len) 928 { 929 /* Don't use _filtered; we can't deal with a QUIT out of 930 target_wait, and I think this might be called from there. */ 931 if (remote_debug > 0) 932 printf_unfiltered ("Got new SYN after %d chars (wanted %d)\n", 933 i, len); 934 continue; 935 } 936 937 err = mips_receive_trailer (trlr, &garbage, &ch, timeout); 938 if (err == -1) 939 { 940 if (throw_error) 941 mips_error ("Timed out waiting for packet"); 942 else 943 return -1; 944 } 945 if (err == -2) 946 { 947 /* Don't use _filtered; we can't deal with a QUIT out of 948 target_wait, and I think this might be called from there. */ 949 if (remote_debug > 0) 950 printf_unfiltered ("Got SYN when wanted trailer\n"); 951 continue; 952 } 953 954 /* If this is the wrong sequence number, ignore it. */ 955 if (HDR_GET_SEQ (hdr) != mips_receive_seq) 956 { 957 /* Don't use _filtered; we can't deal with a QUIT out of 958 target_wait, and I think this might be called from there. */ 959 if (remote_debug > 0) 960 printf_unfiltered ("Ignoring sequence number %d (want %d)\n", 961 HDR_GET_SEQ (hdr), mips_receive_seq); 962 continue; 963 } 964 965 if (mips_cksum (hdr, buff, len) == TRLR_GET_CKSUM (trlr)) 966 break; 967 968 if (remote_debug > 0) 969 /* Don't use _filtered; we can't deal with a QUIT out of 970 target_wait, and I think this might be called from there. */ 971 printf_unfiltered ("Bad checksum; data %d, trailer %d\n", 972 mips_cksum (hdr, buff, len), 973 TRLR_GET_CKSUM (trlr)); 974 975 /* The checksum failed. Send an acknowledgement for the 976 previous packet to tell the remote to resend the packet. */ 977 ack[HDR_INDX_SYN] = HDR_SET_SYN (0, 0, mips_receive_seq); 978 ack[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq); 979 ack[HDR_INDX_LEN1] = HDR_SET_LEN1 (0, 0, mips_receive_seq); 980 ack[HDR_INDX_SEQ] = HDR_SET_SEQ (0, 0, mips_receive_seq); 981 982 cksum = mips_cksum (ack, (unsigned char *) NULL, 0); 983 984 ack[HDR_LENGTH + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum); 985 ack[HDR_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum); 986 ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum); 987 988 if (remote_debug > 0) 989 { 990 ack[HDR_LENGTH + TRLR_LENGTH] = '\0'; 991 /* Don't use _filtered; we can't deal with a QUIT out of 992 target_wait, and I think this might be called from there. */ 993 printf_unfiltered ("Writing ack %d \"%s\"\n", mips_receive_seq, 994 ack + 1); 995 } 996 997 if (SERIAL_WRITE (mips_desc, ack, HDR_LENGTH + TRLR_LENGTH) != 0) 998 { 999 if (throw_error) 1000 mips_error ("write to target failed: %s", safe_strerror (errno)); 1001 else 1002 return -1; 1003 } 1004 } 1005 1006 if (remote_debug > 0) 1007 { 1008 buff[len] = '\0'; 1009 /* Don't use _filtered; we can't deal with a QUIT out of 1010 target_wait, and I think this might be called from there. */ 1011 printf_unfiltered ("Got packet \"%s\"\n", buff); 1012 } 1013 1014 /* We got the packet. Send an acknowledgement. */ 1015 mips_receive_seq = (mips_receive_seq + 1) % SEQ_MODULOS; 1016 1017 ack[HDR_INDX_SYN] = HDR_SET_SYN (0, 0, mips_receive_seq); 1018 ack[HDR_INDX_TYPE_LEN] = HDR_SET_TYPE_LEN (0, 0, mips_receive_seq); 1019 ack[HDR_INDX_LEN1] = HDR_SET_LEN1 (0, 0, mips_receive_seq); 1020 ack[HDR_INDX_SEQ] = HDR_SET_SEQ (0, 0, mips_receive_seq); 1021 1022 cksum = mips_cksum (ack, (unsigned char *) NULL, 0); 1023 1024 ack[HDR_LENGTH + TRLR_INDX_CSUM1] = TRLR_SET_CSUM1 (cksum); 1025 ack[HDR_LENGTH + TRLR_INDX_CSUM2] = TRLR_SET_CSUM2 (cksum); 1026 ack[HDR_LENGTH + TRLR_INDX_CSUM3] = TRLR_SET_CSUM3 (cksum); 1027 1028 if (remote_debug > 0) 1029 { 1030 ack[HDR_LENGTH + TRLR_LENGTH] = '\0'; 1031 /* Don't use _filtered; we can't deal with a QUIT out of 1032 target_wait, and I think this might be called from there. */ 1033 printf_unfiltered ("Writing ack %d \"%s\"\n", mips_receive_seq, 1034 ack + 1); 1035 } 1036 1037 if (SERIAL_WRITE (mips_desc, ack, HDR_LENGTH + TRLR_LENGTH) != 0) 1038 { 1039 if (throw_error) 1040 mips_error ("write to target failed: %s", safe_strerror (errno)); 1041 else 1042 return -1; 1043 } 1044 1045 return len; 1046 } 1047 1048 /* Optionally send a request to the remote system and optionally wait 1049 for the reply. This implements the remote debugging protocol, 1050 which is built on top of the packet protocol defined above. Each 1051 request has an ADDR argument and a DATA argument. The following 1052 requests are defined: 1053 1054 \0 don't send a request; just wait for a reply 1055 i read word from instruction space at ADDR 1056 d read word from data space at ADDR 1057 I write DATA to instruction space at ADDR 1058 D write DATA to data space at ADDR 1059 r read register number ADDR 1060 R set register number ADDR to value DATA 1061 c continue execution (if ADDR != 1, set pc to ADDR) 1062 s single step (if ADDR != 1, set pc to ADDR) 1063 1064 The read requests return the value requested. The write requests 1065 return the previous value in the changed location. The execution 1066 requests return a UNIX wait value (the approximate signal which 1067 caused execution to stop is in the upper eight bits). 1068 1069 If PERR is not NULL, this function waits for a reply. If an error 1070 occurs, it sets *PERR to 1 and sets errno according to what the 1071 target board reports. */ 1072 1073 static CORE_ADDR 1074 mips_request (cmd, addr, data, perr, timeout, buff) 1075 int cmd; 1076 CORE_ADDR addr; 1077 CORE_ADDR data; 1078 int *perr; 1079 int timeout; 1080 char *buff; 1081 { 1082 char myBuff[DATA_MAXLEN + 1]; 1083 int len; 1084 int rpid; 1085 char rcmd; 1086 int rerrflg; 1087 int rresponse; 1088 1089 if (buff == (char *) NULL) 1090 buff = myBuff; 1091 1092 if (cmd != '\0') 1093 { 1094 if (mips_need_reply) 1095 fatal ("mips_request: Trying to send command before reply"); 1096 sprintf (buff, "0x0 %c 0x%s 0x%s", cmd, paddr(addr), paddr(data)); 1097 mips_send_packet (buff, 1); 1098 mips_need_reply = 1; 1099 } 1100 1101 if (perr == (int *) NULL) 1102 return 0; 1103 1104 if (! mips_need_reply) 1105 fatal ("mips_request: Trying to get reply before command"); 1106 1107 mips_need_reply = 0; 1108 1109 len = mips_receive_packet (buff, 1, timeout); 1110 buff[len] = '\0'; 1111 1112 if (sscanf (buff, "0x%x %c 0x%x 0x%x", 1113 &rpid, &rcmd, &rerrflg, &rresponse) != 4 1114 || (cmd != '\0' && rcmd != cmd)) 1115 mips_error ("Bad response from remote board"); 1116 1117 if (rerrflg != 0) 1118 { 1119 *perr = 1; 1120 1121 /* FIXME: This will returns MIPS errno numbers, which may or may 1122 not be the same as errno values used on other systems. If 1123 they stick to common errno values, they will be the same, but 1124 if they don't, they must be translated. */ 1125 errno = rresponse; 1126 1127 return 0; 1128 } 1129 1130 *perr = 0; 1131 return rresponse; 1132 } 1133 1134 static void 1135 mips_initialize_cleanups (arg) 1136 PTR arg; 1137 { 1138 mips_initializing = 0; 1139 } 1140 1141 static void 1142 mips_send_command (cmd, prompt) 1143 const char *cmd; 1144 int prompt; 1145 { 1146 SERIAL_WRITE (mips_desc, cmd, strlen(cmd)); 1147 mips_expect (cmd); 1148 mips_expect ("\012"); 1149 if (prompt) 1150 mips_expect (mips_monitor_prompt); 1151 } 1152 1153 /* Enter remote (dbx) debug mode: */ 1154 static void 1155 mips_enter_debug () 1156 { 1157 /* Reset the sequence numbers, ready for the new debug sequence: */ 1158 mips_send_seq = 0; 1159 mips_receive_seq = 0; 1160 1161 if (mips_monitor == MON_PMON || mips_monitor == MON_DDB) 1162 mips_send_command ("debug\015", 0); 1163 else /* assume IDT monitor by default */ 1164 mips_send_command ("db tty0\015", 0); 1165 1166 SERIAL_WRITE (mips_desc, "\015", sizeof "\015" - 1); 1167 1168 /* We don't need to absorb any spurious characters here, since the 1169 mips_receive_header will eat up a reasonable number of characters 1170 whilst looking for the SYN, however this avoids the "garbage" 1171 being displayed to the user. */ 1172 if (mips_monitor == MON_PMON || mips_monitor == MON_DDB) 1173 mips_expect ("\015"); 1174 1175 { 1176 char buff[DATA_MAXLEN + 1]; 1177 if (mips_receive_packet (buff, 1, 3) < 0) 1178 mips_error ("Failed to initialize (didn't receive packet)."); 1179 } 1180 } 1181 1182 /* Exit remote (dbx) debug mode, returning to the monitor prompt: */ 1183 static int 1184 mips_exit_debug () 1185 { 1186 int err; 1187 1188 if (mips_monitor == MON_DDB) 1189 { 1190 /* The Ddb version of PMON exits immediately, so we do not get 1191 a reply to this command: */ 1192 mips_request ('x', (unsigned int) 0, (unsigned int) 0, NULL, 1193 mips_receive_wait, NULL); 1194 mips_need_reply = 0; 1195 if (!mips_expect (" break!")) 1196 return -1; 1197 } 1198 else 1199 mips_request ('x', (unsigned int) 0, (unsigned int) 0, &err, 1200 mips_receive_wait, NULL); 1201 1202 if (mips_monitor == MON_PMON && !mips_expect ("Exiting remote debug mode")) 1203 return -1; 1204 1205 if (mips_monitor == MON_DDB) 1206 { 1207 if (!mips_expect ("\012")) 1208 return -1; 1209 } 1210 else 1211 if (!mips_expect ("\015\012")) 1212 return -1; 1213 1214 if (!mips_expect (mips_monitor_prompt)) 1215 return -1; 1216 1217 return 0; 1218 } 1219 1220 /* Initialize a new connection to the MIPS board, and make sure we are 1221 really connected. */ 1222 1223 static void 1224 mips_initialize () 1225 { 1226 int err; 1227 struct cleanup *old_cleanups = make_cleanup (mips_initialize_cleanups, NULL); 1228 int j; 1229 1230 /* What is this code doing here? I don't see any way it can happen, and 1231 it might mean mips_initializing didn't get cleared properly. 1232 So I'll make it a warning. */ 1233 1234 if (mips_initializing) 1235 { 1236 warning ("internal error: mips_initialize called twice"); 1237 return; 1238 } 1239 1240 mips_wait_flag = 0; 1241 mips_initializing = 1; 1242 1243 /* At this point, the packit protocol isn't responding. We'll try getting 1244 into the monitor, and restarting the protocol. */ 1245 1246 /* Force the system into the monitor. After this we *should* be at 1247 the mips_monitor_prompt. */ 1248 if (mips_monitor == MON_PMON || mips_monitor == MON_DDB) 1249 j = 0; /* start by checking if we are already at the prompt */ 1250 else 1251 j = 1; /* start by sending a break */ 1252 for (; j <= 4; j++) 1253 { 1254 switch (j) 1255 { 1256 case 0: /* First, try sending a CR */ 1257 SERIAL_FLUSH_INPUT (mips_desc); 1258 SERIAL_WRITE (mips_desc, "\015", 1); 1259 break; 1260 case 1: /* First, try sending a break */ 1261 SERIAL_SEND_BREAK (mips_desc); 1262 break; 1263 case 2: /* Then, try a ^C */ 1264 SERIAL_WRITE (mips_desc, "\003", 1); 1265 break; 1266 case 3: /* Then, try escaping from download */ 1267 { 1268 if (mips_monitor == MON_PMON || mips_monitor == MON_DDB) 1269 { 1270 char tbuff[7]; 1271 1272 /* We shouldn't need to send multiple termination 1273 sequences, since the target performs line (or 1274 block) reads, and then processes those 1275 packets. In-case we were downloading a large packet 1276 we flush the output buffer before inserting a 1277 termination sequence. */ 1278 SERIAL_FLUSH_OUTPUT (mips_desc); 1279 sprintf (tbuff, "\015/E/E\015"); 1280 SERIAL_WRITE (mips_desc, tbuff, 6); 1281 } 1282 else 1283 { 1284 char srec[10]; 1285 int i; 1286 1287 /* We are possibly in binary download mode, having 1288 aborted in the middle of an S-record. ^C won't 1289 work because of binary mode. The only reliable way 1290 out is to send enough termination packets (8 bytes) 1291 to fill up and then overflow the largest size 1292 S-record (255 bytes in this case). This amounts to 1293 256/8 + 1 packets. 1294 */ 1295 1296 mips_make_srec (srec, '7', 0, NULL, 0); 1297 1298 for (i = 1; i <= 33; i++) 1299 { 1300 SERIAL_WRITE (mips_desc, srec, 8); 1301 1302 if (SERIAL_READCHAR (mips_desc, 0) >= 0) 1303 break; /* Break immediatly if we get something from 1304 the board. */ 1305 } 1306 } 1307 } 1308 break; 1309 case 4: 1310 mips_error ("Failed to initialize."); 1311 } 1312 1313 if (mips_expect (mips_monitor_prompt)) 1314 break; 1315 } 1316 1317 if (mips_monitor == MON_PMON || mips_monitor == MON_DDB) 1318 { 1319 /* Ensure the correct target state: */ 1320 mips_send_command ("set regsize 64\015", -1); 1321 mips_send_command ("set hostport tty0\015", -1); 1322 mips_send_command ("set brkcmd \"\"\015", -1); 1323 /* Delete all the current breakpoints: */ 1324 mips_send_command ("db *\015", -1); 1325 /* NOTE: PMON does not have breakpoint support through the 1326 "debug" mode, only at the monitor command-line. */ 1327 } 1328 1329 mips_enter_debug (); 1330 1331 /* Clear all breakpoints: */ 1332 if (common_breakpoint ('b', -1, 0, NULL)) 1333 monitor_supports_breakpoints = 0; 1334 else 1335 monitor_supports_breakpoints = 1; 1336 1337 do_cleanups (old_cleanups); 1338 1339 /* If this doesn't call error, we have connected; we don't care if 1340 the request itself succeeds or fails. */ 1341 1342 mips_request ('r', (unsigned int) 0, (unsigned int) 0, &err, 1343 mips_receive_wait, NULL); 1344 set_current_frame (create_new_frame (read_fp (), read_pc ())); 1345 select_frame (get_current_frame (), 0); 1346 } 1347 1348 /* Open a connection to the remote board. */ 1349 static void 1350 common_open (ops, name, from_tty) 1351 struct target_ops *ops; 1352 char *name; 1353 int from_tty; 1354 { 1355 char *ptype; 1356 1357 if (name == 0) 1358 error ( 1359 "To open a MIPS remote debugging connection, you need to specify what serial\n\ 1360 device is attached to the target board (e.g., /dev/ttya)."); 1361 1362 target_preopen (from_tty); 1363 1364 if (mips_is_open) 1365 unpush_target (current_ops); 1366 1367 mips_desc = SERIAL_OPEN (name); 1368 if (mips_desc == (serial_t) NULL) 1369 perror_with_name (name); 1370 1371 if (baud_rate != -1) 1372 { 1373 if (SERIAL_SETBAUDRATE (mips_desc, baud_rate)) 1374 { 1375 SERIAL_CLOSE (mips_desc); 1376 perror_with_name (name); 1377 } 1378 } 1379 1380 SERIAL_RAW (mips_desc); 1381 1382 current_ops = ops; 1383 mips_is_open = 1; 1384 1385 mips_initialize (); 1386 1387 if (from_tty) 1388 printf_unfiltered ("Remote MIPS debugging using %s\n", name); 1389 1390 /* Switch to using remote target now. */ 1391 push_target (ops); 1392 1393 /* FIXME: Should we call start_remote here? */ 1394 1395 /* Try to figure out the processor model if possible. */ 1396 ptype = mips_read_processor_type (); 1397 if (ptype) 1398 mips_set_processor_type_command (strsave (ptype), 0); 1399 1400 /* This is really the job of start_remote however, that makes an assumption 1401 that the target is about to print out a status message of some sort. That 1402 doesn't happen here (in fact, it may not be possible to get the monitor to 1403 send the appropriate packet). */ 1404 1405 flush_cached_frames (); 1406 registers_changed (); 1407 stop_pc = read_pc (); 1408 set_current_frame (create_new_frame (read_fp (), stop_pc)); 1409 select_frame (get_current_frame (), 0); 1410 print_stack_frame (selected_frame, -1, 1); 1411 } 1412 1413 static void 1414 mips_open (name, from_tty) 1415 char *name; 1416 int from_tty; 1417 { 1418 mips_monitor = MON_IDT; 1419 common_open (&mips_ops, name, from_tty); 1420 } 1421 1422 static void 1423 pmon_open (name, from_tty) 1424 char *name; 1425 int from_tty; 1426 { 1427 /* The PMON monitor has a prompt different from the default 1428 "TARGET_MONITOR_PROMPT": */ 1429 mips_monitor_prompt = "PMON> "; 1430 mips_monitor = MON_PMON; 1431 common_open (&pmon_ops, name, from_tty); 1432 } 1433 1434 static void 1435 ddb_open (name, from_tty) 1436 char *name; 1437 int from_tty; 1438 { 1439 /* The PMON monitor has a prompt different from the default 1440 "TARGET_MONITOR_PROMPT": */ 1441 mips_monitor_prompt = "NEC010>"; 1442 mips_monitor = MON_DDB; 1443 common_open (&ddb_ops, name, from_tty); 1444 } 1445 1446 /* Close a connection to the remote board. */ 1447 1448 static void 1449 mips_close (quitting) 1450 int quitting; 1451 { 1452 if (mips_is_open) 1453 { 1454 int err; 1455 1456 mips_is_open = 0; 1457 1458 /* Get the board out of remote debugging mode. */ 1459 (void) mips_exit_debug (); 1460 1461 SERIAL_CLOSE (mips_desc); 1462 } 1463 } 1464 1465 /* Detach from the remote board. */ 1466 1467 static void 1468 mips_detach (args, from_tty) 1469 char *args; 1470 int from_tty; 1471 { 1472 if (args) 1473 error ("Argument given to \"detach\" when remotely debugging."); 1474 1475 pop_target (); 1476 1477 mips_close (1); 1478 1479 if (from_tty) 1480 printf_unfiltered ("Ending remote MIPS debugging.\n"); 1481 } 1482 1483 /* Tell the target board to resume. This does not wait for a reply 1484 from the board. */ 1485 1486 static void 1487 mips_resume (pid, step, siggnal) 1488 int pid, step; 1489 enum target_signal siggnal; 1490 { 1491 1492 1493 mips_request (step ? 's' : 'c', 1494 (unsigned int) 1, 1495 (unsigned int) siggnal, 1496 (int *) NULL, 1497 mips_receive_wait, NULL); 1498 } 1499 1500 /* Return the signal corresponding to SIG, where SIG is the number which 1501 the MIPS protocol uses for the signal. */ 1502 enum target_signal 1503 mips_signal_from_protocol (sig) 1504 int sig; 1505 { 1506 /* We allow a few more signals than the IDT board actually returns, on 1507 the theory that there is at least *some* hope that perhaps the numbering 1508 for these signals is widely agreed upon. */ 1509 if (sig <= 0 1510 || sig > 31) 1511 return TARGET_SIGNAL_UNKNOWN; 1512 1513 /* Don't want to use target_signal_from_host because we are converting 1514 from MIPS signal numbers, not host ones. Our internal numbers 1515 match the MIPS numbers for the signals the board can return, which 1516 are: SIGINT, SIGSEGV, SIGBUS, SIGILL, SIGFPE, SIGTRAP. */ 1517 return (enum target_signal) sig; 1518 } 1519 1520 /* Wait until the remote stops, and return a wait status. */ 1521 1522 static int 1523 mips_wait (pid, status) 1524 int pid; 1525 struct target_waitstatus *status; 1526 { 1527 int rstatus; 1528 int err; 1529 char buff[DATA_MAXLEN]; 1530 int rpc, rfp, rsp; 1531 char flags[20]; 1532 int nfields; 1533 1534 interrupt_count = 0; 1535 hit_watchpoint = 0; 1536 1537 /* If we have not sent a single step or continue command, then the 1538 board is waiting for us to do something. Return a status 1539 indicating that it is stopped. */ 1540 if (! mips_need_reply) 1541 { 1542 status->kind = TARGET_WAITKIND_STOPPED; 1543 status->value.sig = TARGET_SIGNAL_TRAP; 1544 return 0; 1545 } 1546 1547 /* No timeout; we sit here as long as the program continues to execute. */ 1548 mips_wait_flag = 1; 1549 rstatus = mips_request ('\000', (unsigned int) 0, (unsigned int) 0, &err, -1, 1550 buff); 1551 mips_wait_flag = 0; 1552 if (err) 1553 mips_error ("Remote failure: %s", safe_strerror (errno)); 1554 1555 nfields = sscanf (buff, "0x%*x %*c 0x%*x 0x%*x 0x%x 0x%x 0x%x 0x%*x %s", 1556 &rpc, &rfp, &rsp, flags); 1557 1558 /* See if we got back extended status. If so, pick out the pc, fp, sp, etc... */ 1559 1560 if (nfields == 7 || nfields == 9) 1561 { 1562 char buf[MAX_REGISTER_RAW_SIZE]; 1563 1564 store_unsigned_integer (buf, REGISTER_RAW_SIZE (PC_REGNUM), rpc); 1565 supply_register (PC_REGNUM, buf); 1566 1567 store_unsigned_integer (buf, REGISTER_RAW_SIZE (PC_REGNUM), rfp); 1568 supply_register (30, buf); /* This register they are avoiding and so it is unnamed */ 1569 1570 store_unsigned_integer (buf, REGISTER_RAW_SIZE (SP_REGNUM), rsp); 1571 supply_register (SP_REGNUM, buf); 1572 1573 store_unsigned_integer (buf, REGISTER_RAW_SIZE (FP_REGNUM), 0); 1574 supply_register (FP_REGNUM, buf); 1575 1576 if (nfields == 9) 1577 { 1578 int i; 1579 1580 for (i = 0; i <= 2; i++) 1581 if (flags[i] == 'r' || flags[i] == 'w') 1582 hit_watchpoint = 1; 1583 else if (flags[i] == '\000') 1584 break; 1585 } 1586 } 1587 1588 /* Translate a MIPS waitstatus. We use constants here rather than WTERMSIG 1589 and so on, because the constants we want here are determined by the 1590 MIPS protocol and have nothing to do with what host we are running on. */ 1591 if ((rstatus & 0377) == 0) 1592 { 1593 status->kind = TARGET_WAITKIND_EXITED; 1594 status->value.integer = (((rstatus) >> 8) & 0377); 1595 } 1596 else if ((rstatus & 0377) == 0177) 1597 { 1598 status->kind = TARGET_WAITKIND_STOPPED; 1599 status->value.sig = mips_signal_from_protocol (((rstatus) >> 8) & 0377); 1600 } 1601 else 1602 { 1603 status->kind = TARGET_WAITKIND_SIGNALLED; 1604 status->value.sig = mips_signal_from_protocol (rstatus & 0177); 1605 } 1606 1607 return 0; 1608 } 1609 1610 static int 1611 pmon_wait (pid, status) 1612 int pid; 1613 struct target_waitstatus *status; 1614 { 1615 int rstatus; 1616 int err; 1617 char buff[DATA_MAXLEN]; 1618 1619 interrupt_count = 0; 1620 hit_watchpoint = 0; 1621 1622 /* If we have not sent a single step or continue command, then the 1623 board is waiting for us to do something. Return a status 1624 indicating that it is stopped. */ 1625 if (! mips_need_reply) 1626 { 1627 status->kind = TARGET_WAITKIND_STOPPED; 1628 status->value.sig = TARGET_SIGNAL_TRAP; 1629 return 0; 1630 } 1631 1632 /* Sit, polling the serial until the target decides to talk to 1633 us. NOTE: the timeout value we use is used not just for the 1634 first character, but for all the characters. */ 1635 mips_wait_flag = 1; 1636 rstatus = mips_request ('\000', (unsigned int) 0, (unsigned int) 0, &err, -1, 1637 buff); 1638 mips_wait_flag = 0; 1639 if (err) 1640 mips_error ("Remote failure: %s", safe_strerror (errno)); 1641 1642 /* NOTE: The following (sig) numbers are defined by PMON: 1643 SPP_SIGTRAP 5 breakpoint 1644 SPP_SIGINT 2 1645 SPP_SIGSEGV 11 1646 SPP_SIGBUS 10 1647 SPP_SIGILL 4 1648 SPP_SIGFPE 8 1649 SPP_SIGTERM 15 */ 1650 1651 /* On returning from a continue, the PMON monitor seems to start 1652 echoing back the messages we send prior to sending back the 1653 ACK. The code can cope with this, but to try and avoid the 1654 unnecessary serial traffic, and "spurious" characters displayed 1655 to the user, we cheat and reset the debug protocol. The problems 1656 seems to be caused by a check on the number of arguments, and the 1657 command length, within the monitor causing it to echo the command 1658 as a bad packet. */ 1659 if (mips_monitor != MON_DDB) 1660 { 1661 mips_exit_debug (); 1662 mips_enter_debug (); 1663 } 1664 1665 /* Translate a MIPS waitstatus. We use constants here rather than WTERMSIG 1666 and so on, because the constants we want here are determined by the 1667 MIPS protocol and have nothing to do with what host we are running on. */ 1668 if ((rstatus & 0377) == 0) 1669 { 1670 status->kind = TARGET_WAITKIND_EXITED; 1671 status->value.integer = (((rstatus) >> 8) & 0377); 1672 } 1673 else if ((rstatus & 0377) == 0177) 1674 { 1675 status->kind = TARGET_WAITKIND_STOPPED; 1676 status->value.sig = mips_signal_from_protocol (((rstatus) >> 8) & 0377); 1677 } 1678 else 1679 { 1680 status->kind = TARGET_WAITKIND_SIGNALLED; 1681 status->value.sig = mips_signal_from_protocol (rstatus & 0177); 1682 } 1683 1684 return 0; 1685 } 1686 1687 /* We have to map between the register numbers used by gdb and the 1688 register numbers used by the debugging protocol. This function 1689 assumes that we are using tm-mips.h. */ 1690 1691 #define REGNO_OFFSET 96 1692 1693 static int 1694 mips_map_regno (regno) 1695 int regno; 1696 { 1697 if (regno < 32) 1698 return regno; 1699 if (regno >= FP0_REGNUM && regno < FP0_REGNUM + 32) 1700 return regno - FP0_REGNUM + 32; 1701 switch (regno) 1702 { 1703 case PC_REGNUM: 1704 return REGNO_OFFSET + 0; 1705 case CAUSE_REGNUM: 1706 return REGNO_OFFSET + 1; 1707 case HI_REGNUM: 1708 return REGNO_OFFSET + 2; 1709 case LO_REGNUM: 1710 return REGNO_OFFSET + 3; 1711 case FCRCS_REGNUM: 1712 return REGNO_OFFSET + 4; 1713 case FCRIR_REGNUM: 1714 return REGNO_OFFSET + 5; 1715 default: 1716 /* FIXME: Is there a way to get the status register? */ 1717 return 0; 1718 } 1719 } 1720 1721 /* Fetch the remote registers. */ 1722 1723 static void 1724 mips_fetch_registers (regno) 1725 int regno; 1726 { 1727 unsigned LONGEST val; 1728 int err; 1729 1730 if (regno == -1) 1731 { 1732 for (regno = 0; regno < NUM_REGS; regno++) 1733 mips_fetch_registers (regno); 1734 return; 1735 } 1736 1737 if (regno == FP_REGNUM || regno == ZERO_REGNUM) 1738 /* FP_REGNUM on the mips is a hack which is just supposed to read 1739 zero (see also mips-nat.c). */ 1740 val = 0; 1741 else 1742 { 1743 /* Unfortunately the PMON version in the Vr4300 board has been 1744 compiled without the 64bit register access commands. This 1745 means we cannot get hold of the full register width. */ 1746 if (mips_monitor == MON_DDB) 1747 val = (unsigned)mips_request ('t', (unsigned int) mips_map_regno (regno), 1748 (unsigned int) 0, &err, mips_receive_wait, NULL); 1749 else 1750 val = mips_request ('r', (unsigned int) mips_map_regno (regno), 1751 (unsigned int) 0, &err, mips_receive_wait, NULL); 1752 if (err) 1753 mips_error ("Can't read register %d: %s", regno, 1754 safe_strerror (errno)); 1755 } 1756 1757 { 1758 char buf[MAX_REGISTER_RAW_SIZE]; 1759 1760 /* We got the number the register holds, but gdb expects to see a 1761 value in the target byte ordering. */ 1762 store_unsigned_integer (buf, REGISTER_RAW_SIZE (regno), val); 1763 supply_register (regno, buf); 1764 } 1765 } 1766 1767 /* Prepare to store registers. The MIPS protocol can store individual 1768 registers, so this function doesn't have to do anything. */ 1769 1770 static void 1771 mips_prepare_to_store () 1772 { 1773 } 1774 1775 /* Store remote register(s). */ 1776 1777 static void 1778 mips_store_registers (regno) 1779 int regno; 1780 { 1781 int err; 1782 1783 if (regno == -1) 1784 { 1785 for (regno = 0; regno < NUM_REGS; regno++) 1786 mips_store_registers (regno); 1787 return; 1788 } 1789 1790 mips_request ('R', (unsigned int) mips_map_regno (regno), 1791 read_register (regno), 1792 &err, mips_receive_wait, NULL); 1793 if (err) 1794 mips_error ("Can't write register %d: %s", regno, safe_strerror (errno)); 1795 } 1796 1797 /* Fetch a word from the target board. */ 1798 1799 static unsigned int 1800 mips_fetch_word (addr) 1801 CORE_ADDR addr; 1802 { 1803 unsigned int val; 1804 int err; 1805 1806 /* FIXME! addr was cast to uint! */ 1807 val = mips_request ('d', addr, (unsigned int) 0, &err, 1808 mips_receive_wait, NULL); 1809 if (err) 1810 { 1811 /* Data space failed; try instruction space. */ 1812 /* FIXME! addr was cast to uint! */ 1813 val = mips_request ('i', addr, (unsigned int) 0, &err, 1814 mips_receive_wait, NULL); 1815 if (err) 1816 mips_error ("Can't read address 0x%s: %s", 1817 paddr(addr), safe_strerror (errno)); 1818 } 1819 return val; 1820 } 1821 1822 /* Store a word to the target board. Returns errno code or zero for 1823 success. If OLD_CONTENTS is non-NULL, put the old contents of that 1824 memory location there. */ 1825 1826 /* FIXME! make sure only 32-bit quantities get stored! */ 1827 static int 1828 mips_store_word (addr, val, old_contents) 1829 CORE_ADDR addr; 1830 unsigned int val; 1831 char *old_contents; 1832 { 1833 int err; 1834 unsigned int oldcontents; 1835 1836 oldcontents = mips_request ('D', addr, (unsigned int) val, 1837 &err, 1838 mips_receive_wait, NULL); 1839 if (err) 1840 { 1841 /* Data space failed; try instruction space. */ 1842 oldcontents = mips_request ('I', addr, 1843 (unsigned int) val, &err, 1844 mips_receive_wait, NULL); 1845 if (err) 1846 return errno; 1847 } 1848 if (old_contents != NULL) 1849 store_unsigned_integer (old_contents, 4, oldcontents); 1850 return 0; 1851 } 1852 1853 /* Read or write LEN bytes from inferior memory at MEMADDR, 1854 transferring to or from debugger address MYADDR. Write to inferior 1855 if SHOULD_WRITE is nonzero. Returns length of data written or 1856 read; 0 for error. Note that protocol gives us the correct value 1857 for a longword, since it transfers values in ASCII. We want the 1858 byte values, so we have to swap the longword values. */ 1859 1860 static int 1861 mips_xfer_memory (memaddr, myaddr, len, write, ignore) 1862 CORE_ADDR memaddr; 1863 char *myaddr; 1864 int len; 1865 int write; 1866 struct target_ops *ignore; 1867 { 1868 register int i; 1869 /* Round starting address down to longword boundary. */ 1870 register CORE_ADDR addr = memaddr &~ 3; 1871 /* Round ending address up; get number of longwords that makes. */ 1872 register int count = (((memaddr + len) - addr) + 3) / 4; 1873 /* Allocate buffer of that many longwords. */ 1874 register char *buffer = alloca (count * 4); 1875 1876 int status; 1877 1878 if (write) 1879 { 1880 /* Fill start and end extra bytes of buffer with existing data. */ 1881 if (addr != memaddr || len < 4) 1882 { 1883 /* Need part of initial word -- fetch it. */ 1884 store_unsigned_integer (&buffer[0], 4, mips_fetch_word (addr)); 1885 } 1886 1887 if (count > 1) 1888 { 1889 /* Need part of last word -- fetch it. FIXME: we do this even 1890 if we don't need it. */ 1891 store_unsigned_integer (&buffer[(count - 1) * 4], 4, 1892 mips_fetch_word (addr + (count - 1) * 4)); 1893 } 1894 1895 /* Copy data to be written over corresponding part of buffer */ 1896 1897 memcpy ((char *) buffer + (memaddr & 3), myaddr, len); 1898 1899 /* Write the entire buffer. */ 1900 1901 for (i = 0; i < count; i++, addr += 4) 1902 { 1903 status = mips_store_word (addr, 1904 extract_unsigned_integer (&buffer[i*4], 4), 1905 NULL); 1906 /* Report each kilobyte (we download 32-bit words at a time) */ 1907 if (i % 256 == 255) 1908 { 1909 printf_unfiltered ("*"); 1910 fflush (stdout); 1911 } 1912 if (status) 1913 { 1914 errno = status; 1915 return 0; 1916 } 1917 /* FIXME: Do we want a QUIT here? */ 1918 } 1919 if (count >= 256) 1920 printf_unfiltered ("\n"); 1921 } 1922 else 1923 { 1924 /* Read all the longwords */ 1925 for (i = 0; i < count; i++, addr += 4) 1926 { 1927 store_unsigned_integer (&buffer[i*4], 4, mips_fetch_word (addr)); 1928 QUIT; 1929 } 1930 1931 /* Copy appropriate bytes out of the buffer. */ 1932 memcpy (myaddr, buffer + (memaddr & 3), len); 1933 } 1934 return len; 1935 } 1936 1937 /* Print info on this target. */ 1938 1939 static void 1940 mips_files_info (ignore) 1941 struct target_ops *ignore; 1942 { 1943 printf_unfiltered ("Debugging a MIPS board over a serial line.\n"); 1944 } 1945 1946 /* Kill the process running on the board. This will actually only 1947 work if we are doing remote debugging over the console input. I 1948 think that if IDT/sim had the remote debug interrupt enabled on the 1949 right port, we could interrupt the process with a break signal. */ 1950 1951 static void 1952 mips_kill () 1953 { 1954 if (!mips_wait_flag) 1955 return; 1956 1957 interrupt_count++; 1958 1959 if (interrupt_count >= 2) 1960 { 1961 interrupt_count = 0; 1962 1963 target_terminal_ours (); 1964 1965 if (query ("Interrupted while waiting for the program.\n\ 1966 Give up (and stop debugging it)? ")) 1967 { 1968 /* Clean up in such a way that mips_close won't try to talk to the 1969 board (it almost surely won't work since we weren't able to talk to 1970 it). */ 1971 mips_wait_flag = 0; 1972 mips_is_open = 0; 1973 SERIAL_CLOSE (mips_desc); 1974 1975 printf_unfiltered ("Ending remote MIPS debugging.\n"); 1976 target_mourn_inferior (); 1977 1978 return_to_top_level (RETURN_QUIT); 1979 } 1980 1981 target_terminal_inferior (); 1982 } 1983 1984 if (remote_debug > 0) 1985 printf_unfiltered ("Sending break\n"); 1986 1987 SERIAL_SEND_BREAK (mips_desc); 1988 1989 #if 0 1990 if (mips_is_open) 1991 { 1992 char cc; 1993 1994 /* Send a ^C. */ 1995 cc = '\003'; 1996 SERIAL_WRITE (mips_desc, &cc, 1); 1997 sleep (1); 1998 target_mourn_inferior (); 1999 } 2000 #endif 2001 } 2002 2003 /* Start running on the target board. */ 2004 2005 static void 2006 mips_create_inferior (execfile, args, env) 2007 char *execfile; 2008 char *args; 2009 char **env; 2010 { 2011 CORE_ADDR entry_pt; 2012 2013 if (args && *args) 2014 { 2015 warning ("\ 2016 Can't pass arguments to remote MIPS board; arguments ignored."); 2017 /* And don't try to use them on the next "run" command. */ 2018 execute_command ("set args", 0); 2019 } 2020 2021 if (execfile == 0 || exec_bfd == 0) 2022 error ("No executable file specified"); 2023 2024 entry_pt = (CORE_ADDR) bfd_get_start_address (exec_bfd); 2025 2026 init_wait_for_inferior (); 2027 2028 /* FIXME: Should we set inferior_pid here? */ 2029 2030 proceed (entry_pt, TARGET_SIGNAL_DEFAULT, 0); 2031 } 2032 2033 /* Clean up after a process. Actually nothing to do. */ 2034 2035 static void 2036 mips_mourn_inferior () 2037 { 2038 if (current_ops != NULL) 2039 unpush_target (current_ops); 2040 generic_mourn_inferior (); 2041 } 2042 2043 /* We can write a breakpoint and read the shadow contents in one 2044 operation. */ 2045 2046 /* The IDT board uses an unusual breakpoint value, and sometimes gets 2047 confused when it sees the usual MIPS breakpoint instruction. */ 2048 2049 #define BREAK_INSN (0x00000a0d) 2050 #define BREAK_INSN_SIZE (4) 2051 2052 /* Insert a breakpoint on targets that don't have any better breakpoint 2053 support. We read the contents of the target location and stash it, 2054 then overwrite it with a breakpoint instruction. ADDR is the target 2055 location in the target machine. CONTENTS_CACHE is a pointer to 2056 memory allocated for saving the target contents. It is guaranteed 2057 by the caller to be long enough to save sizeof BREAKPOINT bytes (this 2058 is accomplished via BREAKPOINT_MAX). */ 2059 2060 static int 2061 mips_insert_breakpoint (addr, contents_cache) 2062 CORE_ADDR addr; 2063 char *contents_cache; 2064 { 2065 int status; 2066 2067 if (monitor_supports_breakpoints) 2068 return common_breakpoint ('B', addr, 0x3, "f"); 2069 2070 return mips_store_word (addr, BREAK_INSN, contents_cache); 2071 } 2072 2073 static int 2074 mips_remove_breakpoint (addr, contents_cache) 2075 CORE_ADDR addr; 2076 char *contents_cache; 2077 { 2078 if (monitor_supports_breakpoints) 2079 return common_breakpoint ('b', addr, 0, NULL); 2080 2081 return target_write_memory (addr, contents_cache, BREAK_INSN_SIZE); 2082 } 2083 2084 #if 0 /* currently not used */ 2085 /* PMON does not currently provide support for the debug mode 'b' 2086 commands to manipulate breakpoints. However, if we wanted to use 2087 the monitor breakpoints (rather than the GDB BREAK_INSN version) 2088 then this code performs the work needed to leave debug mode, 2089 set/clear the breakpoint, and then return to debug mode. */ 2090 2091 #define PMON_MAX_BP (33) /* 32 SW, 1 HW */ 2092 static CORE_ADDR mips_pmon_bp_info[PMON_MAX_BP]; 2093 /* NOTE: The code relies on this vector being zero-initialised by the system */ 2094 2095 static int 2096 pmon_insert_breakpoint (addr, contents_cache) 2097 CORE_ADDR addr; 2098 char *contents_cache; 2099 { 2100 int status; 2101 2102 if (monitor_supports_breakpoints) 2103 { 2104 char tbuff[12]; /* space for breakpoint command */ 2105 int bpnum; 2106 CORE_ADDR bpaddr; 2107 2108 /* PMON does not support debug level breakpoint set/remove: */ 2109 if (mips_exit_debug ()) 2110 mips_error ("Failed to exit debug mode"); 2111 2112 sprintf (tbuff, "b %08x\015", addr); 2113 mips_send_command (tbuff, 0); 2114 2115 mips_expect ("Bpt "); 2116 2117 if (!mips_getstring (tbuff, 2)) 2118 return 1; 2119 tbuff[2] = '\0'; /* terminate the string */ 2120 if (sscanf (tbuff, "%d", &bpnum) != 1) 2121 { 2122 fprintf_unfiltered (stderr, "Invalid decimal breakpoint number from target: %s\n", tbuff); 2123 return 1; 2124 } 2125 2126 mips_expect (" = "); 2127 2128 /* Lead in the hex number we are expecting: */ 2129 tbuff[0] = '0'; 2130 tbuff[1] = 'x'; 2131 2132 /* FIXME!! only 8 bytes! need to expand for Bfd64; 2133 which targets return 64-bit addresses? PMON returns only 32! */ 2134 if (!mips_getstring (&tbuff[2], 8)) 2135 return 1; 2136 tbuff[10] = '\0'; /* terminate the string */ 2137 2138 if (sscanf (tbuff, "0x%08x", &bpaddr) != 1) 2139 { 2140 fprintf_unfiltered (stderr, "Invalid hex address from target: %s\n", tbuff); 2141 return 1; 2142 } 2143 2144 if (bpnum >= PMON_MAX_BP) 2145 { 2146 fprintf_unfiltered (stderr, "Error: Returned breakpoint number %d outside acceptable range (0..%d)\n", 2147 bpnum, PMON_MAX_BP - 1); 2148 return 1; 2149 } 2150 2151 if (bpaddr != addr) 2152 fprintf_unfiltered (stderr, "Warning: Breakpoint addresses do not match: 0x%x != 0x%x\n", addr, bpaddr); 2153 2154 mips_pmon_bp_info[bpnum] = bpaddr; 2155 2156 mips_expect ("\015\012"); 2157 mips_expect (mips_monitor_prompt); 2158 2159 mips_enter_debug (); 2160 2161 return 0; 2162 } 2163 2164 return mips_store_word (addr, BREAK_INSN, contents_cache); 2165 } 2166 2167 static int 2168 pmon_remove_breakpoint (addr, contents_cache) 2169 CORE_ADDR addr; 2170 char *contents_cache; 2171 { 2172 if (monitor_supports_breakpoints) 2173 { 2174 int bpnum; 2175 char tbuff[7]; /* enough for delete breakpoint command */ 2176 2177 for (bpnum = 0; bpnum < PMON_MAX_BP; bpnum++) 2178 if (mips_pmon_bp_info[bpnum] == addr) 2179 break; 2180 2181 if (bpnum >= PMON_MAX_BP) 2182 { 2183 fprintf_unfiltered (stderr, "pmon_remove_breakpoint: Failed to find breakpoint at address 0x%s\n", paddr(addr)); 2184 return 1; 2185 } 2186 2187 if (mips_exit_debug ()) 2188 mips_error ("Failed to exit debug mode"); 2189 2190 sprintf (tbuff, "db %02d\015", bpnum); 2191 2192 mips_send_command (tbuff, -1); 2193 /* NOTE: If the breakpoint does not exist then a "Bpt <dd> not 2194 set" message will be returned. */ 2195 2196 mips_enter_debug (); 2197 2198 return 0; 2199 } 2200 2201 return target_write_memory (addr, contents_cache, BREAK_INSN_SIZE); 2202 } 2203 #endif 2204 2205 /* Compute a don't care mask for the region bounding ADDR and ADDR + LEN - 1. 2206 This is used for memory ref breakpoints. */ 2207 2208 static unsigned long 2209 calculate_mask (addr, len) 2210 CORE_ADDR addr; 2211 int len; 2212 { 2213 unsigned long mask; 2214 int i; 2215 2216 mask = addr ^ (addr + len - 1); 2217 2218 for (i = 32; i >= 0; i--) 2219 if (mask == 0) 2220 break; 2221 else 2222 mask >>= 1; 2223 2224 mask = (unsigned long) 0xffffffff >> i; 2225 2226 return mask; 2227 } 2228 2229 /* Set a data watchpoint. ADDR and LEN should be obvious. TYPE is either 1 2230 for a read watchpoint, or 2 for a read/write watchpoint. */ 2231 2232 int 2233 remote_mips_set_watchpoint (addr, len, type) 2234 CORE_ADDR addr; 2235 int len; 2236 int type; 2237 { 2238 CORE_ADDR first_addr; 2239 unsigned long mask; 2240 char *flags; 2241 2242 mask = calculate_mask (addr, len); 2243 2244 first_addr = addr & ~mask; 2245 2246 switch (type) 2247 { 2248 case 0: /* write */ 2249 flags = "w"; 2250 break; 2251 case 1: /* read */ 2252 flags = "r"; 2253 break; 2254 case 2: /* read/write */ 2255 flags = "rw"; 2256 break; 2257 default: 2258 abort (); 2259 } 2260 2261 if (common_breakpoint ('B', first_addr, mask, flags)) 2262 return -1; 2263 2264 return 0; 2265 } 2266 2267 int 2268 remote_mips_remove_watchpoint (addr, len, type) 2269 CORE_ADDR addr; 2270 int len; 2271 int type; 2272 { 2273 CORE_ADDR first_addr; 2274 unsigned long mask; 2275 2276 mask = calculate_mask (addr, len); 2277 2278 first_addr = addr & ~mask; 2279 2280 if (common_breakpoint ('b', first_addr, 0, NULL)) 2281 return -1; 2282 2283 return 0; 2284 } 2285 2286 int 2287 remote_mips_stopped_by_watchpoint () 2288 { 2289 return hit_watchpoint; 2290 } 2291 2292 /* This routine generates the a breakpoint command of the form: 2293 2294 0x0 <CMD> <ADDR> <MASK> <FLAGS> 2295 2296 Where <CMD> is one of: `B' to set, or `b' to clear a breakpoint. <ADDR> is 2297 the address of the breakpoint. <MASK> is a don't care mask for addresses. 2298 <FLAGS> is any combination of `r', `w', or `f' for read/write/or fetch. */ 2299 2300 static int 2301 common_breakpoint (cmd, addr, mask, flags) 2302 int cmd; 2303 CORE_ADDR addr; 2304 CORE_ADDR mask; 2305 char *flags; 2306 { 2307 int len; 2308 char buf[DATA_MAXLEN + 1]; 2309 char rcmd; 2310 int rpid, rerrflg, rresponse; 2311 int nfields; 2312 2313 if (flags) 2314 sprintf (buf, "0x0 %c 0x%x 0x%x %s", cmd, addr, mask, flags); 2315 else 2316 sprintf (buf, "0x0 %c 0x%x", cmd, addr); 2317 2318 mips_send_packet (buf, 1); 2319 2320 len = mips_receive_packet (buf, 1, mips_receive_wait); 2321 buf[len] = '\0'; 2322 2323 nfields = sscanf (buf, "0x%x %c 0x%x 0x%x", &rpid, &rcmd, &rerrflg, &rresponse); 2324 2325 if (nfields != 4 2326 || rcmd != cmd) 2327 mips_error ("common_breakpoint: Bad response from remote board: %s", buf); 2328 2329 if (rerrflg != 0) 2330 { 2331 /* Ddb returns "0x0 b 0x16 0x0\000", whereas 2332 Cogent returns "0x0 b 0xffffffff 0x16\000": */ 2333 if (mips_monitor == MON_DDB) 2334 rresponse = rerrflg; 2335 if (rresponse != 22) /* invalid argument */ 2336 fprintf_unfiltered (stderr, "common_breakpoint (0x%s): Got error: 0x%x\n", 2337 paddr(addr), rresponse); 2338 return 1; 2339 } 2340 2341 return 0; 2342 } 2343 2344 static void 2345 send_srec (srec, len, addr) 2346 char *srec; 2347 int len; 2348 CORE_ADDR addr; 2349 { 2350 while (1) 2351 { 2352 int ch; 2353 2354 SERIAL_WRITE (mips_desc, srec, len); 2355 2356 ch = mips_readchar (2); 2357 2358 switch (ch) 2359 { 2360 case SERIAL_TIMEOUT: 2361 error ("Timeout during download."); 2362 break; 2363 case 0x6: /* ACK */ 2364 return; 2365 case 0x15: /* NACK */ 2366 fprintf_unfiltered (gdb_stderr, "Download got a NACK at byte %d! Retrying.\n", addr); 2367 continue; 2368 default: 2369 error ("Download got unexpected ack char: 0x%x, retrying.\n", ch); 2370 } 2371 } 2372 } 2373 2374 /* Download a binary file by converting it to S records. */ 2375 2376 static void 2377 mips_load_srec (args) 2378 char *args; 2379 { 2380 bfd *abfd; 2381 asection *s; 2382 char *buffer, srec[1024]; 2383 int i; 2384 int srec_frame = 200; 2385 int reclen; 2386 static int hashmark = 1; 2387 2388 buffer = alloca (srec_frame * 2 + 256); 2389 2390 abfd = bfd_openr (args, 0); 2391 if (!abfd) 2392 { 2393 printf_filtered ("Unable to open file %s\n", args); 2394 return; 2395 } 2396 2397 if (bfd_check_format (abfd, bfd_object) == 0) 2398 { 2399 printf_filtered ("File is not an object file\n"); 2400 return; 2401 } 2402 2403 /* This actually causes a download in the IDT binary format: */ 2404 #define LOAD_CMD "load -b -s tty0\015" 2405 mips_send_command (LOAD_CMD, 0); 2406 2407 for (s = abfd->sections; s; s = s->next) 2408 { 2409 if (s->flags & SEC_LOAD) 2410 { 2411 int numbytes; 2412 2413 /* FIXME! vma too small?? */ 2414 printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s->name, s->vma, 2415 s->vma + s->_raw_size); 2416 gdb_flush (gdb_stdout); 2417 2418 for (i = 0; i < s->_raw_size; i += numbytes) 2419 { 2420 numbytes = min (srec_frame, s->_raw_size - i); 2421 2422 bfd_get_section_contents (abfd, s, buffer, i, numbytes); 2423 2424 reclen = mips_make_srec (srec, '3', s->vma + i, buffer, numbytes); 2425 send_srec (srec, reclen, s->vma + i); 2426 2427 if (hashmark) 2428 { 2429 putchar_unfiltered ('#'); 2430 gdb_flush (gdb_stdout); 2431 } 2432 2433 } /* Per-packet (or S-record) loop */ 2434 2435 putchar_unfiltered ('\n'); 2436 } /* Loadable sections */ 2437 } 2438 if (hashmark) 2439 putchar_unfiltered ('\n'); 2440 2441 /* Write a type 7 terminator record. no data for a type 7, and there 2442 is no data, so len is 0. */ 2443 2444 reclen = mips_make_srec (srec, '7', abfd->start_address, NULL, 0); 2445 2446 send_srec (srec, reclen, abfd->start_address); 2447 2448 SERIAL_FLUSH_INPUT (mips_desc); 2449 } 2450 2451 /* 2452 * mips_make_srec -- make an srecord. This writes each line, one at a 2453 * time, each with it's own header and trailer line. 2454 * An srecord looks like this: 2455 * 2456 * byte count-+ address 2457 * start ---+ | | data +- checksum 2458 * | | | | 2459 * S01000006F6B692D746573742E73726563E4 2460 * S315000448600000000000000000FC00005900000000E9 2461 * S31A0004000023C1400037DE00F023604000377B009020825000348D 2462 * S30B0004485A0000000000004E 2463 * S70500040000F6 2464 * 2465 * S<type><length><address><data><checksum> 2466 * 2467 * Where 2468 * - length 2469 * is the number of bytes following upto the checksum. Note that 2470 * this is not the number of chars following, since it takes two 2471 * chars to represent a byte. 2472 * - type 2473 * is one of: 2474 * 0) header record 2475 * 1) two byte address data record 2476 * 2) three byte address data record 2477 * 3) four byte address data record 2478 * 7) four byte address termination record 2479 * 8) three byte address termination record 2480 * 9) two byte address termination record 2481 * 2482 * - address 2483 * is the start address of the data following, or in the case of 2484 * a termination record, the start address of the image 2485 * - data 2486 * is the data. 2487 * - checksum 2488 * is the sum of all the raw byte data in the record, from the length 2489 * upwards, modulo 256 and subtracted from 255. 2490 * 2491 * This routine returns the length of the S-record. 2492 * 2493 */ 2494 2495 static int 2496 mips_make_srec (buf, type, memaddr, myaddr, len) 2497 char *buf; 2498 int type; 2499 CORE_ADDR memaddr; 2500 unsigned char *myaddr; 2501 int len; 2502 { 2503 unsigned char checksum; 2504 int i; 2505 2506 /* Create the header for the srec. addr_size is the number of bytes in the address, 2507 and 1 is the number of bytes in the count. */ 2508 2509 /* FIXME!! bigger buf required for 64-bit! */ 2510 buf[0] = 'S'; 2511 buf[1] = type; 2512 buf[2] = len + 4 + 1; /* len + 4 byte address + 1 byte checksum */ 2513 /* This assumes S3 style downloads (4byte addresses). There should 2514 probably be a check, or the code changed to make it more 2515 explicit. */ 2516 buf[3] = memaddr >> 24; 2517 buf[4] = memaddr >> 16; 2518 buf[5] = memaddr >> 8; 2519 buf[6] = memaddr; 2520 memcpy (&buf[7], myaddr, len); 2521 2522 /* Note that the checksum is calculated on the raw data, not the 2523 hexified data. It includes the length, address and the data 2524 portions of the packet. */ 2525 checksum = 0; 2526 buf += 2; /* Point at length byte */ 2527 for (i = 0; i < len + 4 + 1; i++) 2528 checksum += *buf++; 2529 2530 *buf = ~checksum; 2531 2532 return len + 8; 2533 } 2534 2535 /* The following manifest controls whether we enable the simple flow 2536 control support provided by the monitor. If enabled the code will 2537 wait for an affirmative ACK between transmitting packets. */ 2538 #define DOETXACK (1) 2539 2540 /* The PMON fast-download uses an encoded packet format constructed of 2541 3byte data packets (encoded as 4 printable ASCII characters), and 2542 escape sequences (preceded by a '/'): 2543 2544 'K' clear checksum 2545 'C' compare checksum (12bit value, not included in checksum calculation) 2546 'S' define symbol name (for addr) terminated with "," and padded to 4char boundary 2547 'Z' zero fill multiple of 3bytes 2548 'B' byte (12bit encoded value, of 8bit data) 2549 'A' address (36bit encoded value) 2550 'E' define entry as original address, and exit load 2551 2552 The packets are processed in 4 character chunks, so the escape 2553 sequences that do not have any data (or variable length data) 2554 should be padded to a 4 character boundary. The decoder will give 2555 an error if the complete message block size is not a multiple of 2556 4bytes (size of record). 2557 2558 The encoding of numbers is done in 6bit fields. The 6bit value is 2559 used to index into this string to get the specific character 2560 encoding for the value: */ 2561 static char encoding[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789,."; 2562 2563 /* Convert the number of bits required into an encoded number, 6bits 2564 at a time (range 0..63). Keep a checksum if required (passed 2565 pointer non-NULL). The function returns the number of encoded 2566 characters written into the buffer. */ 2567 static int 2568 pmon_makeb64 (v, p, n, chksum) 2569 unsigned long v; 2570 char *p; 2571 int n; 2572 int *chksum; 2573 { 2574 int count = (n / 6); 2575 2576 if ((n % 12) != 0) { 2577 fprintf_unfiltered(stderr,"Fast encoding bitcount must be a multiple of 12bits: %dbit%s\n",n,(n == 1)?"":"s"); 2578 return(0); 2579 } 2580 if (n > 36) { 2581 fprintf_unfiltered(stderr,"Fast encoding cannot process more than 36bits at the moment: %dbits\n",n); 2582 return(0); 2583 } 2584 2585 /* Deal with the checksum: */ 2586 if (chksum != NULL) { 2587 switch (n) { 2588 case 36: *chksum += ((v >> 24) & 0xFFF); 2589 case 24: *chksum += ((v >> 12) & 0xFFF); 2590 case 12: *chksum += ((v >> 0) & 0xFFF); 2591 } 2592 } 2593 2594 do { 2595 n -= 6; 2596 *p++ = encoding[(v >> n) & 0x3F]; 2597 } while (n > 0); 2598 2599 return(count); 2600 } 2601 2602 /* Shorthand function (that could be in-lined) to output the zero-fill 2603 escape sequence into the data stream. */ 2604 static int 2605 pmon_zeroset (recsize, buff, amount, chksum) 2606 int recsize; 2607 char **buff; 2608 int *amount; 2609 unsigned int *chksum; 2610 { 2611 int count; 2612 2613 sprintf(*buff,"/Z"); 2614 count = pmon_makeb64 (*amount, (*buff + 2), 12, chksum); 2615 *buff += (count + 2); 2616 *amount = 0; 2617 return(recsize + count + 2); 2618 } 2619 2620 static int 2621 pmon_checkset (recsize, buff, value) 2622 int recsize; 2623 char **buff; 2624 int *value; 2625 { 2626 int count; 2627 2628 /* Add the checksum (without updating the value): */ 2629 sprintf (*buff, "/C"); 2630 count = pmon_makeb64 (*value, (*buff + 2), 12, NULL); 2631 *buff += (count + 2); 2632 sprintf (*buff, "\015"); 2633 *buff += 2; /* include zero terminator */ 2634 /* Forcing a checksum validation clears the sum: */ 2635 *value = 0; 2636 return(recsize + count + 3); 2637 } 2638 2639 /* Amount of padding we leave after at the end of the output buffer, 2640 for the checksum and line termination characters: */ 2641 #define CHECKSIZE (4 + 4 + 4 + 2) 2642 /* zero-fill, checksum, transfer end and line termination space. */ 2643 2644 /* The amount of binary data loaded from the object file in a single 2645 operation: */ 2646 #define BINCHUNK (1024) 2647 2648 /* Maximum line of data accepted by the monitor: */ 2649 #define MAXRECSIZE (550) 2650 /* NOTE: This constant depends on the monitor being used. This value 2651 is for PMON 5.x on the Cogent Vr4300 board. */ 2652 2653 static void 2654 pmon_make_fastrec (outbuf, inbuf, inptr, inamount, recsize, csum, zerofill) 2655 char **outbuf; 2656 unsigned char *inbuf; 2657 int *inptr; 2658 int inamount; 2659 int *recsize; 2660 unsigned int *csum; 2661 unsigned int *zerofill; 2662 { 2663 int count = 0; 2664 char *p = *outbuf; 2665 2666 /* This is a simple check to ensure that our data will fit within 2667 the maximum allowable record size. Each record output is 4bytes 2668 in length. We must allow space for a pending zero fill command, 2669 the record, and a checksum record. */ 2670 while ((*recsize < (MAXRECSIZE - CHECKSIZE)) && ((inamount - *inptr) > 0)) { 2671 /* Process the binary data: */ 2672 if ((inamount - *inptr) < 3) { 2673 if (*zerofill != 0) 2674 *recsize = pmon_zeroset (*recsize, &p, zerofill, csum); 2675 sprintf (p, "/B"); 2676 count = pmon_makeb64 (inbuf[*inptr], &p[2], 12, csum); 2677 p += (2 + count); 2678 *recsize += (2 + count); 2679 (*inptr)++; 2680 } else { 2681 unsigned int value = ((inbuf[*inptr + 0] << 16) | (inbuf[*inptr + 1] << 8) | inbuf[*inptr + 2]); 2682 /* Simple check for zero data. TODO: A better check would be 2683 to check the last, and then the middle byte for being zero 2684 (if the first byte is not). We could then check for 2685 following runs of zeros, and if above a certain size it is 2686 worth the 4 or 8 character hit of the byte insertions used 2687 to pad to the start of the zeroes. NOTE: This also depends 2688 on the alignment at the end of the zero run. */ 2689 if (value == 0x00000000) { 2690 (*zerofill)++; 2691 if (*zerofill == 0xFFF) /* 12bit counter */ 2692 *recsize = pmon_zeroset (*recsize, &p, zerofill, csum); 2693 }else { 2694 if (*zerofill != 0) 2695 *recsize = pmon_zeroset (*recsize, &p, zerofill, csum); 2696 count = pmon_makeb64 (value, p, 24, csum); 2697 p += count; 2698 *recsize += count; 2699 } 2700 *inptr += 3; 2701 } 2702 } 2703 2704 *outbuf = p; 2705 return; 2706 } 2707 2708 #if defined(DOETXACK) 2709 static int 2710 pmon_check_ack() 2711 { 2712 int c = SERIAL_READCHAR (mips_desc, 2); 2713 if ((c == SERIAL_TIMEOUT) || (c != 0x06)) { 2714 fprintf_unfiltered (gdb_stderr, "Failed to receive valid ACK\n"); 2715 return(-1); /* terminate the download */ 2716 } 2717 return(0); 2718 } 2719 #endif /* DOETXACK */ 2720 2721 static void 2722 pmon_load_fast (file) 2723 char *file; 2724 { 2725 bfd *abfd; 2726 asection *s; 2727 unsigned char *binbuf; 2728 char *buffer; 2729 int reclen; 2730 unsigned int csum = 0; 2731 static int hashmark = 1; 2732 int bintotal = 0; 2733 int final; 2734 int finished = 0; 2735 2736 buffer = (char *)xmalloc(MAXRECSIZE + 1); 2737 binbuf = (unsigned char *)xmalloc(BINCHUNK); 2738 2739 abfd = bfd_openr(file,0); 2740 if (!abfd) 2741 { 2742 printf_filtered ("Unable to open file %s\n",file); 2743 return; 2744 } 2745 2746 if (bfd_check_format(abfd,bfd_object) == 0) 2747 { 2748 printf_filtered("File is not an object file\n"); 2749 return; 2750 } 2751 2752 /* Setup the required download state: */ 2753 mips_send_command ("set dlproto etxack\015", -1); 2754 mips_send_command ("set dlecho off\015", -1); 2755 /* NOTE: We get a "cannot set variable" message if the variable is 2756 already defined to have the argument we give. The code doesn't 2757 care, since it just scans to the next prompt anyway. */ 2758 /* Start the download: */ 2759 mips_send_command (LOAD_CMD, 0); 2760 mips_expect ("Downloading from tty0, ^C to abort\015\012"); 2761 2762 /* Zero the checksum */ 2763 sprintf(buffer,"/Kxx\015"); 2764 reclen = strlen(buffer); 2765 SERIAL_WRITE (mips_desc, buffer, reclen); 2766 2767 #if defined(DOETXACK) 2768 finished = pmon_check_ack(); 2769 #endif /* DOETXACK */ 2770 2771 for (s = abfd->sections; s && !finished; s = s->next) 2772 if (s->flags & SEC_LOAD) /* only deal with loadable sections */ 2773 { 2774 bintotal += s->_raw_size; 2775 final = (s->vma + s->_raw_size); 2776 2777 printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s->name, (unsigned int)s->vma, 2778 (unsigned int)(s->vma + s->_raw_size)); 2779 gdb_flush (gdb_stdout); 2780 2781 /* Output the starting address */ 2782 sprintf(buffer,"/A"); 2783 reclen = pmon_makeb64(s->vma,&buffer[2],36,&csum); 2784 buffer[2 + reclen] = '\015'; 2785 buffer[3 + reclen] = '\0'; 2786 reclen += 3; /* for the initial escape code and carriage return */ 2787 SERIAL_WRITE (mips_desc, buffer, reclen); 2788 #if defined(DOETXACK) 2789 finished = pmon_check_ack(); 2790 #endif /* DOETXACK */ 2791 2792 if (!finished) 2793 { 2794 int binamount; 2795 unsigned int zerofill = 0; 2796 char *bp = buffer; 2797 int i; 2798 2799 reclen = 0; 2800 2801 for (i = 0; ((i < s->_raw_size) && !finished); i += binamount) { 2802 int binptr = 0; 2803 2804 binamount = min (BINCHUNK, s->_raw_size - i); 2805 2806 bfd_get_section_contents (abfd, s, binbuf, i, binamount); 2807 2808 /* This keeps a rolling checksum, until we decide to output 2809 the line: */ 2810 for (; ((binamount - binptr) > 0);) { 2811 pmon_make_fastrec (&bp, binbuf, &binptr, binamount, &reclen, &csum, &zerofill); 2812 if (reclen >= (MAXRECSIZE - CHECKSIZE)) { 2813 reclen = pmon_checkset (reclen, &bp, &csum); 2814 SERIAL_WRITE (mips_desc, buffer, reclen); 2815 #if defined(DOETXACK) 2816 finished = pmon_check_ack(); 2817 if (finished) { 2818 zerofill = 0; /* do not transmit pending zerofills */ 2819 break; 2820 } 2821 #endif /* DOETXACK */ 2822 2823 if (hashmark) { 2824 putchar_unfiltered ('#'); 2825 gdb_flush (gdb_stdout); 2826 } 2827 2828 bp = buffer; 2829 reclen = 0; /* buffer processed */ 2830 } 2831 } 2832 } 2833 2834 /* Ensure no out-standing zerofill requests: */ 2835 if (zerofill != 0) 2836 reclen = pmon_zeroset (reclen, &bp, &zerofill, &csum); 2837 2838 /* and then flush the line: */ 2839 if (reclen > 0) { 2840 reclen = pmon_checkset (reclen, &bp, &csum); 2841 /* Currently pmon_checkset outputs the line terminator by 2842 default, so we write out the buffer so far: */ 2843 SERIAL_WRITE (mips_desc, buffer, reclen); 2844 #if defined(DOETXACK) 2845 finished = pmon_check_ack(); 2846 #endif /* DOETXACK */ 2847 } 2848 } 2849 2850 if (hashmark) 2851 putchar_unfiltered ('\n'); 2852 } 2853 2854 /* Terminate the transfer. We know that we have an empty output 2855 buffer at this point. */ 2856 sprintf (buffer, "/E/E\015"); /* include dummy padding characters */ 2857 reclen = strlen (buffer); 2858 SERIAL_WRITE (mips_desc, buffer, reclen); 2859 2860 if (finished) { /* Ignore the termination message: */ 2861 SERIAL_FLUSH_INPUT (mips_desc); 2862 } else { /* Deal with termination message: */ 2863 char hexnumber[9]; /* includes '\0' space */ 2864 mips_expect ("Entry Address = "); 2865 sprintf(hexnumber,"%x",final); 2866 mips_expect (hexnumber); 2867 #if defined(DOETXACK) 2868 mips_expect ("\015\012\006\015\012total = 0x"); 2869 #else /* normal termination */ 2870 mips_expect ("\015\012\015\012total = 0x"); 2871 #endif /* !DOETXACK */ 2872 sprintf(hexnumber,"%x",bintotal); 2873 mips_expect (hexnumber); 2874 mips_expect (" bytes\015\012"); 2875 } 2876 2877 return; 2878 } 2879 2880 /* mips_load -- download a file. */ 2881 2882 static void 2883 mips_load (file, from_tty) 2884 char *file; 2885 int from_tty; 2886 { 2887 /* Get the board out of remote debugging mode. */ 2888 if (mips_exit_debug ()) 2889 error ("mips_load: Couldn't get into monitor mode."); 2890 2891 if (mips_monitor == MON_PMON || mips_monitor == MON_DDB) 2892 pmon_load_fast (file); 2893 else 2894 mips_load_srec (file); 2895 2896 mips_initialize (); 2897 2898 /* Finally, make the PC point at the start address */ 2899 if (mips_monitor == MON_DDB) 2900 { 2901 /* Work around problem where DDB monitor does not update the 2902 PC after a load. The following ensures that the write_pc() 2903 WILL update the PC value: */ 2904 register_valid[PC_REGNUM] = 0; 2905 } 2906 if (exec_bfd) 2907 write_pc (bfd_get_start_address (exec_bfd)); 2908 2909 inferior_pid = 0; /* No process now */ 2910 2911 /* This is necessary because many things were based on the PC at the time that 2912 we attached to the monitor, which is no longer valid now that we have loaded 2913 new code (and just changed the PC). Another way to do this might be to call 2914 normal_stop, except that the stack may not be valid, and things would get 2915 horribly confused... */ 2916 2917 clear_symtab_users (); 2918 } 2919 2920 /* The target vector. */ 2921 2922 struct target_ops mips_ops = 2923 { 2924 "mips", /* to_shortname */ 2925 "Remote MIPS debugging over serial line", /* to_longname */ 2926 "\ 2927 Debug a board using the MIPS remote debugging protocol over a serial line.\n\ 2928 The argument is the device it is connected to or, if it contains a colon,\n\ 2929 HOST:PORT to access a board over a network", /* to_doc */ 2930 mips_open, /* to_open */ 2931 mips_close, /* to_close */ 2932 NULL, /* to_attach */ 2933 mips_detach, /* to_detach */ 2934 mips_resume, /* to_resume */ 2935 mips_wait, /* to_wait */ 2936 mips_fetch_registers, /* to_fetch_registers */ 2937 mips_store_registers, /* to_store_registers */ 2938 mips_prepare_to_store, /* to_prepare_to_store */ 2939 mips_xfer_memory, /* to_xfer_memory */ 2940 mips_files_info, /* to_files_info */ 2941 mips_insert_breakpoint, /* to_insert_breakpoint */ 2942 mips_remove_breakpoint, /* to_remove_breakpoint */ 2943 NULL, /* to_terminal_init */ 2944 NULL, /* to_terminal_inferior */ 2945 NULL, /* to_terminal_ours_for_output */ 2946 NULL, /* to_terminal_ours */ 2947 NULL, /* to_terminal_info */ 2948 mips_kill, /* to_kill */ 2949 mips_load, /* to_load */ 2950 NULL, /* to_lookup_symbol */ 2951 mips_create_inferior, /* to_create_inferior */ 2952 mips_mourn_inferior, /* to_mourn_inferior */ 2953 NULL, /* to_can_run */ 2954 NULL, /* to_notice_signals */ 2955 0, /* to_thread_alive */ 2956 0, /* to_stop */ 2957 process_stratum, /* to_stratum */ 2958 NULL, /* to_next */ 2959 1, /* to_has_all_memory */ 2960 1, /* to_has_memory */ 2961 1, /* to_has_stack */ 2962 1, /* to_has_registers */ 2963 1, /* to_has_execution */ 2964 NULL, /* sections */ 2965 NULL, /* sections_end */ 2966 OPS_MAGIC /* to_magic */ 2967 }; 2968 2969 /* An alternative target vector: */ 2970 struct target_ops pmon_ops = 2971 { 2972 "pmon", /* to_shortname */ 2973 "Remote MIPS debugging over serial line", /* to_longname */ 2974 "\ 2975 Debug a board using the PMON MIPS remote debugging protocol over a serial\n\ 2976 line. The argument is the device it is connected to or, if it contains a\n\ 2977 colon, HOST:PORT to access a board over a network", /* to_doc */ 2978 pmon_open, /* to_open */ 2979 mips_close, /* to_close */ 2980 NULL, /* to_attach */ 2981 mips_detach, /* to_detach */ 2982 mips_resume, /* to_resume */ 2983 pmon_wait, /* to_wait */ 2984 mips_fetch_registers, /* to_fetch_registers */ 2985 mips_store_registers, /* to_store_registers */ 2986 mips_prepare_to_store, /* to_prepare_to_store */ 2987 mips_xfer_memory, /* to_xfer_memory */ 2988 mips_files_info, /* to_files_info */ 2989 mips_insert_breakpoint, /* to_insert_breakpoint */ 2990 mips_remove_breakpoint, /* to_remove_breakpoint */ 2991 NULL, /* to_terminal_init */ 2992 NULL, /* to_terminal_inferior */ 2993 NULL, /* to_terminal_ours_for_output */ 2994 NULL, /* to_terminal_ours */ 2995 NULL, /* to_terminal_info */ 2996 mips_kill, /* to_kill */ 2997 mips_load, /* to_load */ 2998 NULL, /* to_lookup_symbol */ 2999 mips_create_inferior, /* to_create_inferior */ 3000 mips_mourn_inferior, /* to_mourn_inferior */ 3001 NULL, /* to_can_run */ 3002 NULL, /* to_notice_signals */ 3003 0, /* to_thread_alive */ 3004 0, /* to_stop */ 3005 process_stratum, /* to_stratum */ 3006 NULL, /* to_next */ 3007 1, /* to_has_all_memory */ 3008 1, /* to_has_memory */ 3009 1, /* to_has_stack */ 3010 1, /* to_has_registers */ 3011 1, /* to_has_execution */ 3012 NULL, /* sections */ 3013 NULL, /* sections_end */ 3014 OPS_MAGIC /* to_magic */ 3015 }; 3016 3017 /* Another alternative target vector. This is a PMON system, but with 3018 a different monitor prompt, aswell as some other operational 3019 differences: */ 3020 struct target_ops ddb_ops = 3021 { 3022 "ddb", /* to_shortname */ 3023 "Remote MIPS debugging over serial line", /* to_longname */ 3024 "\ 3025 Debug a board using the PMON MIPS remote debugging protocol over a serial\n\ 3026 line. The argument is the device it is connected to or, if it contains a\n\ 3027 colon, HOST:PORT to access a board over a network", /* to_doc */ 3028 ddb_open, /* to_open */ 3029 mips_close, /* to_close */ 3030 NULL, /* to_attach */ 3031 mips_detach, /* to_detach */ 3032 mips_resume, /* to_resume */ 3033 pmon_wait, /* to_wait */ 3034 mips_fetch_registers, /* to_fetch_registers */ 3035 mips_store_registers, /* to_store_registers */ 3036 mips_prepare_to_store, /* to_prepare_to_store */ 3037 mips_xfer_memory, /* to_xfer_memory */ 3038 mips_files_info, /* to_files_info */ 3039 mips_insert_breakpoint, /* to_insert_breakpoint */ 3040 mips_remove_breakpoint, /* to_remove_breakpoint */ 3041 NULL, /* to_terminal_init */ 3042 NULL, /* to_terminal_inferior */ 3043 NULL, /* to_terminal_ours_for_output */ 3044 NULL, /* to_terminal_ours */ 3045 NULL, /* to_terminal_info */ 3046 mips_kill, /* to_kill */ 3047 mips_load, /* to_load */ 3048 NULL, /* to_lookup_symbol */ 3049 mips_create_inferior, /* to_create_inferior */ 3050 mips_mourn_inferior, /* to_mourn_inferior */ 3051 NULL, /* to_can_run */ 3052 NULL, /* to_notice_signals */ 3053 0, /* to_thread_alive */ 3054 0, /* to_stop */ 3055 process_stratum, /* to_stratum */ 3056 NULL, /* to_next */ 3057 1, /* to_has_all_memory */ 3058 1, /* to_has_memory */ 3059 1, /* to_has_stack */ 3060 1, /* to_has_registers */ 3061 1, /* to_has_execution */ 3062 NULL, /* sections */ 3063 NULL, /* sections_end */ 3064 OPS_MAGIC /* to_magic */ 3065 }; 3066 3067 void 3068 _initialize_remote_mips () 3069 { 3070 add_target (&mips_ops); 3071 add_target (&pmon_ops); 3072 add_target (&ddb_ops); 3073 3074 add_show_from_set ( 3075 add_set_cmd ("timeout", no_class, var_zinteger, 3076 (char *) &mips_receive_wait, 3077 "Set timeout in seconds for remote MIPS serial I/O.", 3078 &setlist), 3079 &showlist); 3080 3081 add_show_from_set ( 3082 add_set_cmd ("retransmit-timeout", no_class, var_zinteger, 3083 (char *) &mips_retransmit_wait, 3084 "Set retransmit timeout in seconds for remote MIPS serial I/O.\n\ 3085 This is the number of seconds to wait for an acknowledgement to a packet\n\ 3086 before resending the packet.", &setlist), 3087 &showlist); 3088 3089 add_show_from_set ( 3090 add_set_cmd ("syn-garbage-limit", no_class, var_zinteger, 3091 (char *) &mips_syn_garbage, 3092 "Set the maximum number of characters to ignore when scanning for a SYN.\n\ 3093 This is the maximum number of characters GDB will ignore when trying to\n\ 3094 synchronize with the remote system. A value of -1 means that there is no limit\n\ 3095 (Note that these characters are printed out even though they are ignored.)", 3096 &setlist), 3097 &showlist); 3098 } 3099