| 1 | /* Remote debugging interface for Motorola's MVME187BUG monitor, an embedded |
| 2 | monitor for the m88k. |
| 3 | |
| 4 | Copyright 1992, 1993 Free Software Foundation, Inc. |
| 5 | Contributed by Cygnus Support. Written by K. Richard Pixley. |
| 6 | |
| 7 | This file is part of GDB. |
| 8 | |
| 9 | This program is free software; you can redistribute it and/or modify |
| 10 | it under the terms of the GNU General Public License as published by |
| 11 | the Free Software Foundation; either version 2 of the License, or |
| 12 | (at your option) any later version. |
| 13 | |
| 14 | This program is distributed in the hope that it will be useful, |
| 15 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 16 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 17 | GNU General Public License for more details. |
| 18 | |
| 19 | You should have received a copy of the GNU General Public License |
| 20 | along with this program; if not, write to the Free Software |
| 21 | Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 22 | |
| 23 | #include "defs.h" |
| 24 | #include "inferior.h" |
| 25 | #include "wait.h" |
| 26 | |
| 27 | #include <string.h> |
| 28 | #include <ctype.h> |
| 29 | #include <fcntl.h> |
| 30 | #include <signal.h> |
| 31 | #include <setjmp.h> |
| 32 | #include <errno.h> |
| 33 | |
| 34 | #include "terminal.h" |
| 35 | #include "gdbcore.h" |
| 36 | #include "gdbcmd.h" |
| 37 | |
| 38 | #include "remote-utils.h" |
| 39 | |
| 40 | extern int sleep(); |
| 41 | |
| 42 | /* External data declarations */ |
| 43 | extern int stop_soon_quietly; /* for wait_for_inferior */ |
| 44 | |
| 45 | /* Forward data declarations */ |
| 46 | extern struct target_ops bug_ops; /* Forward declaration */ |
| 47 | |
| 48 | /* Forward function declarations */ |
| 49 | static int bug_clear_breakpoints PARAMS((void)); |
| 50 | |
| 51 | static int bug_read_memory PARAMS((CORE_ADDR memaddr, |
| 52 | unsigned char *myaddr, |
| 53 | int len)); |
| 54 | |
| 55 | static int bug_write_memory PARAMS((CORE_ADDR memaddr, |
| 56 | unsigned char *myaddr, |
| 57 | int len)); |
| 58 | |
| 59 | /* This variable is somewhat arbitrary. It's here so that it can be |
| 60 | set from within a running gdb. */ |
| 61 | |
| 62 | static int srec_max_retries = 3; |
| 63 | |
| 64 | /* Each S-record download to the target consists of an S0 header |
| 65 | record, some number of S3 data records, and one S7 termination |
| 66 | record. I call this download a "frame". Srec_frame says how many |
| 67 | bytes will be represented in each frame. */ |
| 68 | |
| 69 | static int srec_frame = 160; |
| 70 | |
| 71 | /* This variable determines how many bytes will be represented in each |
| 72 | S3 s-record. */ |
| 73 | |
| 74 | static int srec_bytes = 40; |
| 75 | |
| 76 | /* At one point it appeared to me as though the bug monitor could not |
| 77 | really be expected to receive two sequential characters at 9600 |
| 78 | baud reliably. Echo-pacing is an attempt to force data across the |
| 79 | line even in this condition. Specifically, in echo-pace mode, each |
| 80 | character is sent one at a time and we look for the echo before |
| 81 | sending the next. This is excruciatingly slow. */ |
| 82 | |
| 83 | static int srec_echo_pace = 0; |
| 84 | |
| 85 | /* How long to wait after an srec for a possible error message. |
| 86 | Similar to the above, I tried sleeping after sending each S3 record |
| 87 | in hopes that I might actually see error messages from the bug |
| 88 | monitor. This might actually work if we were to use sleep |
| 89 | intervals smaller than 1 second. */ |
| 90 | |
| 91 | static int srec_sleep = 0; |
| 92 | |
| 93 | /* Every srec_noise records, flub the checksum. This is a debugging |
| 94 | feature. Set the variable to something other than 1 in order to |
| 95 | inject *deliberate* checksum errors. One might do this if one |
| 96 | wanted to test error handling and recovery. */ |
| 97 | |
| 98 | static int srec_noise = 0; |
| 99 | |
| 100 | /* Called when SIGALRM signal sent due to alarm() timeout. */ |
| 101 | |
| 102 | /* Number of SIGTRAPs we need to simulate. That is, the next |
| 103 | NEED_ARTIFICIAL_TRAP calls to bug_wait should just return |
| 104 | SIGTRAP without actually waiting for anything. */ |
| 105 | |
| 106 | static int need_artificial_trap = 0; |
| 107 | |
| 108 | /* |
| 109 | * Download a file specified in 'args', to the bug. |
| 110 | */ |
| 111 | |
| 112 | static void |
| 113 | bug_load (args, fromtty) |
| 114 | char *args; |
| 115 | int fromtty; |
| 116 | { |
| 117 | bfd *abfd; |
| 118 | asection *s; |
| 119 | char buffer[1024]; |
| 120 | |
| 121 | sr_check_open (); |
| 122 | |
| 123 | dcache_flush (gr_get_dcache()); |
| 124 | inferior_pid = 0; |
| 125 | abfd = bfd_openr (args, 0); |
| 126 | if (!abfd) |
| 127 | { |
| 128 | printf_filtered ("Unable to open file %s\n", args); |
| 129 | return; |
| 130 | } |
| 131 | |
| 132 | if (bfd_check_format (abfd, bfd_object) == 0) |
| 133 | { |
| 134 | printf_filtered ("File is not an object file\n"); |
| 135 | return; |
| 136 | } |
| 137 | |
| 138 | s = abfd->sections; |
| 139 | while (s != (asection *) NULL) |
| 140 | { |
| 141 | if (s->flags & SEC_LOAD) |
| 142 | { |
| 143 | int i; |
| 144 | |
| 145 | char *buffer = xmalloc (srec_frame); |
| 146 | |
| 147 | printf_filtered ("%s\t: 0x%4x .. 0x%4x ", s->name, s->vma, s->vma + s->_raw_size); |
| 148 | fflush (stdout); |
| 149 | for (i = 0; i < s->_raw_size; i += srec_frame) |
| 150 | { |
| 151 | if (srec_frame > s->_raw_size - i) |
| 152 | srec_frame = s->_raw_size - i; |
| 153 | |
| 154 | bfd_get_section_contents (abfd, s, buffer, i, srec_frame); |
| 155 | bug_write_memory (s->vma + i, buffer, srec_frame); |
| 156 | printf_filtered ("*"); |
| 157 | fflush (stdout); |
| 158 | } |
| 159 | printf_filtered ("\n"); |
| 160 | free (buffer); |
| 161 | } |
| 162 | s = s->next; |
| 163 | } |
| 164 | sprintf (buffer, "rs ip %lx", (unsigned long) abfd->start_address); |
| 165 | sr_write_cr (buffer); |
| 166 | gr_expect_prompt (); |
| 167 | } |
| 168 | |
| 169 | #if 0 |
| 170 | static char * |
| 171 | get_word (p) |
| 172 | char **p; |
| 173 | { |
| 174 | char *s = *p; |
| 175 | char *word; |
| 176 | char *copy; |
| 177 | size_t len; |
| 178 | |
| 179 | while (isspace (*s)) |
| 180 | s++; |
| 181 | |
| 182 | word = s; |
| 183 | |
| 184 | len = 0; |
| 185 | |
| 186 | while (*s && !isspace (*s)) |
| 187 | { |
| 188 | s++; |
| 189 | len++; |
| 190 | |
| 191 | } |
| 192 | copy = xmalloc (len + 1); |
| 193 | memcpy (copy, word, len); |
| 194 | copy[len] = 0; |
| 195 | *p = s; |
| 196 | return copy; |
| 197 | } |
| 198 | #endif |
| 199 | |
| 200 | static struct gr_settings bug_settings = { |
| 201 | NULL, /* dcache */ |
| 202 | "Bug>", /* prompt */ |
| 203 | &bug_ops, /* ops */ |
| 204 | bug_clear_breakpoints, /* clear_all_breakpoints */ |
| 205 | bug_read_memory, /* readfunc */ |
| 206 | bug_write_memory, /* writefunc */ |
| 207 | gr_generic_checkin, /* checkin */ |
| 208 | }; |
| 209 | |
| 210 | static char *cpu_check_strings[] = { |
| 211 | "=", |
| 212 | "Invalid Register", |
| 213 | }; |
| 214 | |
| 215 | static void |
| 216 | bug_open (args, from_tty) |
| 217 | char *args; |
| 218 | int from_tty; |
| 219 | { |
| 220 | if (args == NULL) |
| 221 | args = ""; |
| 222 | |
| 223 | gr_open(args, from_tty, &bug_settings); |
| 224 | /* decide *now* whether we are on an 88100 or an 88110 */ |
| 225 | sr_write_cr("rs cr06"); |
| 226 | sr_expect("rs cr06"); |
| 227 | |
| 228 | switch (gr_multi_scan(cpu_check_strings, 0)) |
| 229 | { |
| 230 | case 0: /* this is an m88100 */ |
| 231 | target_is_m88110 = 0; |
| 232 | break; |
| 233 | case 1: /* this is an m88110 */ |
| 234 | target_is_m88110 = 1; |
| 235 | break; |
| 236 | default: |
| 237 | abort(); |
| 238 | } |
| 239 | } |
| 240 | |
| 241 | /* Tell the remote machine to resume. */ |
| 242 | |
| 243 | void |
| 244 | bug_resume (pid, step, sig) |
| 245 | int pid, step, sig; |
| 246 | { |
| 247 | dcache_flush (gr_get_dcache()); |
| 248 | |
| 249 | if (step) |
| 250 | { |
| 251 | sr_write_cr("t"); |
| 252 | |
| 253 | /* Force the next bug_wait to return a trap. Not doing anything |
| 254 | about I/O from the target means that the user has to type |
| 255 | "continue" to see any. FIXME, this should be fixed. */ |
| 256 | need_artificial_trap = 1; |
| 257 | } |
| 258 | else |
| 259 | sr_write_cr ("g"); |
| 260 | |
| 261 | return; |
| 262 | } |
| 263 | |
| 264 | /* Wait until the remote machine stops, then return, |
| 265 | storing status in STATUS just as `wait' would. */ |
| 266 | |
| 267 | static char *wait_strings[] = { |
| 268 | "At Breakpoint", |
| 269 | "Exception: Data Access Fault (Local Bus Timeout)", |
| 270 | "\r8???-Bug>", |
| 271 | "\r197-Bug>", |
| 272 | NULL, |
| 273 | }; |
| 274 | |
| 275 | int |
| 276 | bug_wait (status) |
| 277 | WAITTYPE *status; |
| 278 | { |
| 279 | int old_timeout = sr_get_timeout(); |
| 280 | int old_immediate_quit = immediate_quit; |
| 281 | |
| 282 | WSETEXIT ((*status), 0); |
| 283 | |
| 284 | /* read off leftovers from resume so that the rest can be passed |
| 285 | back out as stdout. */ |
| 286 | if (need_artificial_trap == 0) |
| 287 | { |
| 288 | sr_expect("Effective address: "); |
| 289 | (void) sr_get_hex_word(); |
| 290 | sr_expect ("\r\n"); |
| 291 | } |
| 292 | |
| 293 | sr_set_timeout(-1); /* Don't time out -- user program is running. */ |
| 294 | immediate_quit = 1; /* Helps ability to QUIT */ |
| 295 | |
| 296 | switch (gr_multi_scan(wait_strings, need_artificial_trap == 0)) |
| 297 | { |
| 298 | case 0: /* breakpoint case */ |
| 299 | WSETSTOP ((*status), SIGTRAP); |
| 300 | /* user output from the target can be discarded here. (?) */ |
| 301 | gr_expect_prompt(); |
| 302 | break; |
| 303 | |
| 304 | case 1: /* bus error */ |
| 305 | WSETSTOP ((*status), SIGBUS); |
| 306 | /* user output from the target can be discarded here. (?) */ |
| 307 | gr_expect_prompt(); |
| 308 | break; |
| 309 | |
| 310 | case 2: /* normal case */ |
| 311 | case 3: |
| 312 | if (need_artificial_trap != 0) |
| 313 | { |
| 314 | /* stepping */ |
| 315 | WSETSTOP ((*status), SIGTRAP); |
| 316 | need_artificial_trap--; |
| 317 | break; |
| 318 | } |
| 319 | else |
| 320 | { |
| 321 | /* exit case */ |
| 322 | WSETEXIT ((*status), 0); |
| 323 | break; |
| 324 | } |
| 325 | |
| 326 | case -1: /* trouble */ |
| 327 | default: |
| 328 | fprintf_filtered (stderr, |
| 329 | "Trouble reading target during wait\n"); |
| 330 | break; |
| 331 | } |
| 332 | |
| 333 | sr_set_timeout(old_timeout); |
| 334 | immediate_quit = old_immediate_quit; |
| 335 | return 0; |
| 336 | } |
| 337 | |
| 338 | /* Return the name of register number REGNO |
| 339 | in the form input and output by bug. |
| 340 | |
| 341 | Returns a pointer to a static buffer containing the answer. */ |
| 342 | static char * |
| 343 | get_reg_name (regno) |
| 344 | int regno; |
| 345 | { |
| 346 | static char *rn[] = { |
| 347 | "r00", "r01", "r02", "r03", "r04", "r05", "r06", "r07", |
| 348 | "r08", "r09", "r10", "r11", "r12", "r13", "r14", "r15", |
| 349 | "r16", "r17", "r18", "r19", "r20", "r21", "r22", "r23", |
| 350 | "r24", "r25", "r26", "r27", "r28", "r29", "r30", "r31", |
| 351 | |
| 352 | /* these get confusing because we omit a few and switch some ordering around. */ |
| 353 | |
| 354 | "cr01", /* 32 = psr */ |
| 355 | "fcr62", /* 33 = fpsr*/ |
| 356 | "fcr63", /* 34 = fpcr */ |
| 357 | "ip", /* this is something of a cheat. */ |
| 358 | /* 35 = sxip */ |
| 359 | "cr05", /* 36 = snip */ |
| 360 | "cr06", /* 37 = sfip */ |
| 361 | |
| 362 | "x00", "x01", "x02", "x03", "x04", "x05", "x06", "x07", |
| 363 | "x08", "x09", "x10", "x11", "x12", "x13", "x14", "x15", |
| 364 | "x16", "x17", "x18", "x19", "x20", "x21", "x22", "x23", |
| 365 | "x24", "x25", "x26", "x27", "x28", "x29", "x30", "x31", |
| 366 | }; |
| 367 | |
| 368 | return rn[regno]; |
| 369 | } |
| 370 | |
| 371 | #if 0 /* not currently used */ |
| 372 | /* Read from remote while the input matches STRING. Return zero on |
| 373 | success, -1 on failure. */ |
| 374 | |
| 375 | static int |
| 376 | bug_scan (s) |
| 377 | char *s; |
| 378 | { |
| 379 | int c; |
| 380 | |
| 381 | while (*s) |
| 382 | { |
| 383 | c = sr_readchar(); |
| 384 | if (c != *s++) |
| 385 | { |
| 386 | fflush(stdout); |
| 387 | printf("\nNext character is '%c' - %d and s is \"%s\".\n", c, c, --s); |
| 388 | return(-1); |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | return(0); |
| 393 | } |
| 394 | #endif /* never */ |
| 395 | |
| 396 | static int |
| 397 | bug_srec_write_cr (s) |
| 398 | char *s; |
| 399 | { |
| 400 | char *p = s; |
| 401 | |
| 402 | if (srec_echo_pace) |
| 403 | for (p = s; *p; ++p) |
| 404 | { |
| 405 | if (sr_get_debug() > 0) |
| 406 | printf ("%c", *p); |
| 407 | |
| 408 | do |
| 409 | SERIAL_WRITE(sr_get_desc(), p, 1); |
| 410 | while (sr_pollchar() != *p); |
| 411 | } |
| 412 | else |
| 413 | { |
| 414 | sr_write_cr (s); |
| 415 | /* return(bug_scan (s) || bug_scan ("\n")); */ |
| 416 | } |
| 417 | |
| 418 | return(0); |
| 419 | } |
| 420 | |
| 421 | /* Store register REGNO, or all if REGNO == -1. */ |
| 422 | |
| 423 | static void |
| 424 | bug_fetch_register(regno) |
| 425 | int regno; |
| 426 | { |
| 427 | REGISTER_TYPE regval; |
| 428 | |
| 429 | sr_check_open(); |
| 430 | |
| 431 | if (regno == -1) |
| 432 | { |
| 433 | int i; |
| 434 | |
| 435 | for (i = 0; i < NUM_REGS; ++i) |
| 436 | bug_fetch_register(i); |
| 437 | } |
| 438 | else if (target_is_m88110 && regno == SFIP_REGNUM) |
| 439 | { |
| 440 | /* m88110 has no sfip. */ |
| 441 | long l = 0; |
| 442 | supply_register(regno, (char *) &l); |
| 443 | } |
| 444 | else if (regno < XFP_REGNUM) |
| 445 | { |
| 446 | sr_write("rs ", 3); |
| 447 | sr_write_cr(get_reg_name(regno)); |
| 448 | sr_expect("="); |
| 449 | regval = sr_get_hex_word(); |
| 450 | gr_expect_prompt(); |
| 451 | supply_register(regno, (char *) ®val); |
| 452 | } |
| 453 | else |
| 454 | { |
| 455 | /* Float register so we need to parse a strange data format. */ |
| 456 | long p; |
| 457 | unsigned char value[10]; |
| 458 | |
| 459 | sr_write("rs ", 3); |
| 460 | sr_write(get_reg_name(regno), strlen(get_reg_name(regno))); |
| 461 | sr_write_cr(";d"); |
| 462 | sr_expect("rs"); |
| 463 | sr_expect(get_reg_name(regno)); |
| 464 | sr_expect(";d"); |
| 465 | sr_expect("="); |
| 466 | |
| 467 | /* sign */ |
| 468 | p = sr_get_hex_digit(1); |
| 469 | value[0] = p << 7; |
| 470 | |
| 471 | /* exponent */ |
| 472 | sr_expect("_"); |
| 473 | p = sr_get_hex_digit(1); |
| 474 | value[0] += (p << 4); |
| 475 | value[0] += sr_get_hex_digit(1); |
| 476 | |
| 477 | value[1] = sr_get_hex_digit(1) << 4; |
| 478 | |
| 479 | /* fraction */ |
| 480 | sr_expect("_"); |
| 481 | value[1] += sr_get_hex_digit(1); |
| 482 | |
| 483 | value[2] = (sr_get_hex_digit(1) << 4) + sr_get_hex_digit(1); |
| 484 | value[3] = (sr_get_hex_digit(1) << 4) + sr_get_hex_digit(1); |
| 485 | value[4] = (sr_get_hex_digit(1) << 4) + sr_get_hex_digit(1); |
| 486 | value[5] = (sr_get_hex_digit(1) << 4) + sr_get_hex_digit(1); |
| 487 | value[6] = (sr_get_hex_digit(1) << 4) + sr_get_hex_digit(1); |
| 488 | value[7] = (sr_get_hex_digit(1) << 4) + sr_get_hex_digit(1); |
| 489 | value[8] = 0; |
| 490 | value[9] = 0; |
| 491 | |
| 492 | gr_expect_prompt(); |
| 493 | supply_register(regno, value); |
| 494 | } |
| 495 | |
| 496 | return; |
| 497 | } |
| 498 | |
| 499 | /* Store register REGNO, or all if REGNO == -1. */ |
| 500 | |
| 501 | static void |
| 502 | bug_store_register (regno) |
| 503 | int regno; |
| 504 | { |
| 505 | char buffer[1024]; |
| 506 | sr_check_open(); |
| 507 | |
| 508 | if (regno == -1) |
| 509 | { |
| 510 | int i; |
| 511 | |
| 512 | for (i = 0; i < NUM_REGS; ++i) |
| 513 | bug_store_register(i); |
| 514 | } |
| 515 | else |
| 516 | { |
| 517 | char *regname; |
| 518 | |
| 519 | regname = get_reg_name(regno); |
| 520 | |
| 521 | if (target_is_m88110 && regno == SFIP_REGNUM) |
| 522 | return; |
| 523 | else if (regno < XFP_REGNUM) |
| 524 | sprintf(buffer, "rs %s %08x", |
| 525 | regname, |
| 526 | read_register(regno)); |
| 527 | else |
| 528 | { |
| 529 | unsigned char *value = ®isters[REGISTER_BYTE(regno)]; |
| 530 | |
| 531 | sprintf(buffer, "rs %s %1x_%02x%1x_%1x%02x%02x%02x%02x%02x%02x;d", |
| 532 | regname, |
| 533 | /* sign */ |
| 534 | (value[0] >> 7) & 0xf, |
| 535 | /* exponent */ |
| 536 | value[0] & 0x7f, |
| 537 | (value[1] >> 8) & 0xf, |
| 538 | /* fraction */ |
| 539 | value[1] & 0xf, |
| 540 | value[2], |
| 541 | value[3], |
| 542 | value[4], |
| 543 | value[5], |
| 544 | value[6], |
| 545 | value[7]); |
| 546 | } |
| 547 | |
| 548 | sr_write_cr(buffer); |
| 549 | gr_expect_prompt(); |
| 550 | } |
| 551 | |
| 552 | return; |
| 553 | } |
| 554 | |
| 555 | int |
| 556 | bug_xfer_memory (memaddr, myaddr, len, write, target) |
| 557 | CORE_ADDR memaddr; |
| 558 | char *myaddr; |
| 559 | int len; |
| 560 | int write; |
| 561 | struct target_ops *target; /* ignored */ |
| 562 | { |
| 563 | register int i; |
| 564 | |
| 565 | /* Round starting address down to longword boundary. */ |
| 566 | register CORE_ADDR addr; |
| 567 | |
| 568 | /* Round ending address up; get number of longwords that makes. */ |
| 569 | register int count; |
| 570 | |
| 571 | /* Allocate buffer of that many longwords. */ |
| 572 | register int *buffer; |
| 573 | |
| 574 | addr = memaddr & -sizeof (int); |
| 575 | count = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); |
| 576 | |
| 577 | buffer = (int *) alloca (count * sizeof (int)); |
| 578 | |
| 579 | if (write) |
| 580 | { |
| 581 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
| 582 | |
| 583 | if (addr != memaddr || len < (int) sizeof (int)) |
| 584 | { |
| 585 | /* Need part of initial word -- fetch it. */ |
| 586 | buffer[0] = gr_fetch_word (addr); |
| 587 | } |
| 588 | |
| 589 | if (count > 1) /* FIXME, avoid if even boundary */ |
| 590 | { |
| 591 | buffer[count - 1] |
| 592 | = gr_fetch_word (addr + (count - 1) * sizeof (int)); |
| 593 | } |
| 594 | |
| 595 | /* Copy data to be written over corresponding part of buffer */ |
| 596 | |
| 597 | memcpy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); |
| 598 | |
| 599 | /* Write the entire buffer. */ |
| 600 | |
| 601 | for (i = 0; i < count; i++, addr += sizeof (int)) |
| 602 | { |
| 603 | errno = 0; |
| 604 | gr_store_word (addr, buffer[i]); |
| 605 | if (errno) |
| 606 | { |
| 607 | |
| 608 | return 0; |
| 609 | } |
| 610 | |
| 611 | } |
| 612 | } |
| 613 | else |
| 614 | { |
| 615 | /* Read all the longwords */ |
| 616 | for (i = 0; i < count; i++, addr += sizeof (int)) |
| 617 | { |
| 618 | errno = 0; |
| 619 | buffer[i] = gr_fetch_word (addr); |
| 620 | if (errno) |
| 621 | { |
| 622 | return 0; |
| 623 | } |
| 624 | QUIT; |
| 625 | } |
| 626 | |
| 627 | /* Copy appropriate bytes out of the buffer. */ |
| 628 | memcpy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); |
| 629 | } |
| 630 | |
| 631 | return len; |
| 632 | } |
| 633 | |
| 634 | static void |
| 635 | start_load() |
| 636 | { |
| 637 | char *command; |
| 638 | |
| 639 | command = (srec_echo_pace ? "lo 0 ;x" : "lo 0"); |
| 640 | |
| 641 | sr_write_cr (command); |
| 642 | sr_expect (command); |
| 643 | sr_expect ("\r\n"); |
| 644 | bug_srec_write_cr ("S0030000FC"); |
| 645 | return; |
| 646 | } |
| 647 | |
| 648 | /* This is an extremely vulnerable and fragile function. I've made |
| 649 | considerable attempts to make this deterministic, but I've |
| 650 | certainly forgotten something. The trouble is that S-records are |
| 651 | only a partial file format, not a protocol. Worse, apparently the |
| 652 | m88k bug monitor does not run in real time while receiving |
| 653 | S-records. Hence, we must pay excruciating attention to when and |
| 654 | where error messages are returned, and what has actually been sent. |
| 655 | |
| 656 | Each call represents a chunk of memory to be sent to the target. |
| 657 | We break that chunk into an S0 header record, some number of S3 |
| 658 | data records each containing srec_bytes, and an S7 termination |
| 659 | record. */ |
| 660 | |
| 661 | static char *srecord_strings[] = { |
| 662 | "S-RECORD", |
| 663 | "-Bug>", |
| 664 | NULL, |
| 665 | }; |
| 666 | |
| 667 | static int |
| 668 | bug_write_memory (memaddr, myaddr, len) |
| 669 | CORE_ADDR memaddr; |
| 670 | unsigned char *myaddr; |
| 671 | int len; |
| 672 | { |
| 673 | int done; |
| 674 | int checksum; |
| 675 | int x; |
| 676 | int retries; |
| 677 | char buffer[(srec_bytes + 8) << 1]; |
| 678 | |
| 679 | retries = 0; |
| 680 | |
| 681 | do |
| 682 | { |
| 683 | done = 0; |
| 684 | |
| 685 | if (retries > srec_max_retries) |
| 686 | return(-1); |
| 687 | |
| 688 | if (retries > 0) |
| 689 | { |
| 690 | if (sr_get_debug() > 0) |
| 691 | printf("\n<retrying...>\n"); |
| 692 | |
| 693 | /* This gr_expect_prompt call is extremely important. Without |
| 694 | it, we will tend to resend our packet so fast that it |
| 695 | will arrive before the bug monitor is ready to receive |
| 696 | it. This would lead to a very ugly resend loop. */ |
| 697 | |
| 698 | gr_expect_prompt(); |
| 699 | } |
| 700 | |
| 701 | start_load(); |
| 702 | |
| 703 | while (done < len) |
| 704 | { |
| 705 | int thisgo; |
| 706 | int idx; |
| 707 | char *buf = buffer; |
| 708 | CORE_ADDR address; |
| 709 | |
| 710 | checksum = 0; |
| 711 | thisgo = len - done; |
| 712 | if (thisgo > srec_bytes) |
| 713 | thisgo = srec_bytes; |
| 714 | |
| 715 | address = memaddr + done; |
| 716 | sprintf (buf, "S3%02X%08X", thisgo + 4 + 1, address); |
| 717 | buf += 12; |
| 718 | |
| 719 | checksum += (thisgo + 4 + 1 |
| 720 | + (address & 0xff) |
| 721 | + ((address >> 8) & 0xff) |
| 722 | + ((address >> 16) & 0xff) |
| 723 | + ((address >> 24) & 0xff)); |
| 724 | |
| 725 | for (idx = 0; idx < thisgo; idx++) |
| 726 | { |
| 727 | sprintf (buf, "%02X", myaddr[idx + done]); |
| 728 | checksum += myaddr[idx + done]; |
| 729 | buf += 2; |
| 730 | } |
| 731 | |
| 732 | if (srec_noise > 0) |
| 733 | { |
| 734 | /* FIXME-NOW: insert a deliberate error every now and then. |
| 735 | This is intended for testing/debugging the error handling |
| 736 | stuff. */ |
| 737 | static int counter = 0; |
| 738 | if (++counter > srec_noise) |
| 739 | { |
| 740 | counter = 0; |
| 741 | ++checksum; |
| 742 | } |
| 743 | } |
| 744 | |
| 745 | sprintf(buf, "%02X", ~checksum & 0xff); |
| 746 | bug_srec_write_cr (buffer); |
| 747 | |
| 748 | if (srec_sleep != 0) |
| 749 | sleep(srec_sleep); |
| 750 | |
| 751 | /* This pollchar is probably redundant to the gr_multi_scan |
| 752 | below. Trouble is, we can't be sure when or where an |
| 753 | error message will appear. Apparently, when running at |
| 754 | full speed from a typical sun4, error messages tend to |
| 755 | appear to arrive only *after* the s7 record. */ |
| 756 | |
| 757 | if ((x = sr_pollchar()) != 0) |
| 758 | { |
| 759 | if (sr_get_debug() > 0) |
| 760 | printf("\n<retrying...>\n"); |
| 761 | |
| 762 | ++retries; |
| 763 | |
| 764 | /* flush any remaining input and verify that we are back |
| 765 | at the prompt level. */ |
| 766 | gr_expect_prompt(); |
| 767 | /* start all over again. */ |
| 768 | start_load(); |
| 769 | done = 0; |
| 770 | continue; |
| 771 | } |
| 772 | |
| 773 | done += thisgo; |
| 774 | } |
| 775 | |
| 776 | bug_srec_write_cr("S7060000000000F9"); |
| 777 | ++retries; |
| 778 | |
| 779 | /* Having finished the load, we need to figure out whether we |
| 780 | had any errors. */ |
| 781 | } while (gr_multi_scan(srecord_strings, 0) == 0);; |
| 782 | |
| 783 | return(0); |
| 784 | } |
| 785 | |
| 786 | /* Copy LEN bytes of data from debugger memory at MYADDR |
| 787 | to inferior's memory at MEMADDR. Returns errno value. |
| 788 | * sb/sh instructions don't work on unaligned addresses, when TU=1. |
| 789 | */ |
| 790 | |
| 791 | /* Read LEN bytes from inferior memory at MEMADDR. Put the result |
| 792 | at debugger address MYADDR. Returns errno value. */ |
| 793 | static int |
| 794 | bug_read_memory (memaddr, myaddr, len) |
| 795 | CORE_ADDR memaddr; |
| 796 | unsigned char *myaddr; |
| 797 | int len; |
| 798 | { |
| 799 | char request[100]; |
| 800 | char *buffer; |
| 801 | char *p; |
| 802 | char type; |
| 803 | char size; |
| 804 | unsigned char c; |
| 805 | unsigned int inaddr; |
| 806 | unsigned int checksum; |
| 807 | |
| 808 | sprintf(request, "du 0 %x:&%d", memaddr, len); |
| 809 | sr_write_cr(request); |
| 810 | |
| 811 | p = buffer = alloca(len); |
| 812 | |
| 813 | /* scan up through the header */ |
| 814 | sr_expect("S0030000FC"); |
| 815 | |
| 816 | while (p < buffer + len) |
| 817 | { |
| 818 | /* scan off any white space. */ |
| 819 | while (sr_readchar() != 'S') ;; |
| 820 | |
| 821 | /* what kind of s-rec? */ |
| 822 | type = sr_readchar(); |
| 823 | |
| 824 | /* scan record size */ |
| 825 | sr_get_hex_byte(&size); |
| 826 | checksum = size; |
| 827 | --size; |
| 828 | inaddr = 0; |
| 829 | |
| 830 | switch (type) |
| 831 | { |
| 832 | case '7': |
| 833 | case '8': |
| 834 | case '9': |
| 835 | goto done; |
| 836 | |
| 837 | case '3': |
| 838 | sr_get_hex_byte(&c); |
| 839 | inaddr = (inaddr << 8) + c; |
| 840 | checksum += c; |
| 841 | --size; |
| 842 | /* intentional fall through */ |
| 843 | case '2': |
| 844 | sr_get_hex_byte(&c); |
| 845 | inaddr = (inaddr << 8) + c; |
| 846 | checksum += c; |
| 847 | --size; |
| 848 | /* intentional fall through */ |
| 849 | case '1': |
| 850 | sr_get_hex_byte(&c); |
| 851 | inaddr = (inaddr << 8) + c; |
| 852 | checksum += c; |
| 853 | --size; |
| 854 | sr_get_hex_byte(&c); |
| 855 | inaddr = (inaddr << 8) + c; |
| 856 | checksum += c; |
| 857 | --size; |
| 858 | break; |
| 859 | |
| 860 | default: |
| 861 | /* bonk */ |
| 862 | error("reading s-records."); |
| 863 | } |
| 864 | |
| 865 | if (inaddr < memaddr |
| 866 | || (memaddr + len) < (inaddr + size)) |
| 867 | error("srec out of memory range."); |
| 868 | |
| 869 | if (p != buffer + inaddr - memaddr) |
| 870 | error("srec out of sequence."); |
| 871 | |
| 872 | for (; size; --size, ++p) |
| 873 | { |
| 874 | sr_get_hex_byte(p); |
| 875 | checksum += *p; |
| 876 | } |
| 877 | |
| 878 | sr_get_hex_byte(&c); |
| 879 | if (c != (~checksum & 0xff)) |
| 880 | error("bad s-rec checksum"); |
| 881 | } |
| 882 | |
| 883 | done: |
| 884 | gr_expect_prompt(); |
| 885 | if (p != buffer + len) |
| 886 | return(1); |
| 887 | |
| 888 | memcpy(myaddr, buffer, len); |
| 889 | return(0); |
| 890 | } |
| 891 | |
| 892 | #define MAX_BREAKS 16 |
| 893 | static int num_brkpts = 0; |
| 894 | static int |
| 895 | bug_insert_breakpoint (addr, save) |
| 896 | CORE_ADDR addr; |
| 897 | char *save; /* Throw away, let bug save instructions */ |
| 898 | { |
| 899 | sr_check_open (); |
| 900 | |
| 901 | if (num_brkpts < MAX_BREAKS) |
| 902 | { |
| 903 | char buffer[100]; |
| 904 | |
| 905 | num_brkpts++; |
| 906 | sprintf (buffer, "br %x", addr); |
| 907 | sr_write_cr (buffer); |
| 908 | gr_expect_prompt (); |
| 909 | return(0); |
| 910 | } |
| 911 | else |
| 912 | { |
| 913 | fprintf_filtered (stderr, |
| 914 | "Too many break points, break point not installed\n"); |
| 915 | return(1); |
| 916 | } |
| 917 | |
| 918 | } |
| 919 | static int |
| 920 | bug_remove_breakpoint (addr, save) |
| 921 | CORE_ADDR addr; |
| 922 | char *save; /* Throw away, let bug save instructions */ |
| 923 | { |
| 924 | if (num_brkpts > 0) |
| 925 | { |
| 926 | char buffer[100]; |
| 927 | |
| 928 | num_brkpts--; |
| 929 | sprintf (buffer, "nobr %x", addr); |
| 930 | sr_write_cr (buffer); |
| 931 | gr_expect_prompt (); |
| 932 | |
| 933 | } |
| 934 | return (0); |
| 935 | } |
| 936 | |
| 937 | /* Clear the bugs notion of what the break points are */ |
| 938 | static int |
| 939 | bug_clear_breakpoints () |
| 940 | { |
| 941 | |
| 942 | if (sr_is_open()) |
| 943 | { |
| 944 | sr_write_cr ("nobr"); |
| 945 | sr_expect("nobr"); |
| 946 | gr_expect_prompt (); |
| 947 | } |
| 948 | num_brkpts = 0; |
| 949 | return(0); |
| 950 | } |
| 951 | |
| 952 | struct target_ops bug_ops = |
| 953 | { |
| 954 | "bug", "Remote BUG monitor", |
| 955 | "Use the mvme187 board running the BUG monitor connected\n\ |
| 956 | by a serial line.", |
| 957 | |
| 958 | bug_open, gr_close, |
| 959 | 0, gr_detach, bug_resume, bug_wait, /* attach */ |
| 960 | bug_fetch_register, bug_store_register, |
| 961 | gr_prepare_to_store, |
| 962 | bug_xfer_memory, |
| 963 | gr_files_info, |
| 964 | bug_insert_breakpoint, bug_remove_breakpoint, /* Breakpoints */ |
| 965 | 0, 0, 0, 0, 0, /* Terminal handling */ |
| 966 | gr_kill, /* FIXME, kill */ |
| 967 | bug_load, |
| 968 | 0, /* lookup_symbol */ |
| 969 | gr_create_inferior, /* create_inferior */ |
| 970 | gr_mourn, /* mourn_inferior FIXME */ |
| 971 | 0, /* can_run */ |
| 972 | 0, /* notice_signals */ |
| 973 | process_stratum, 0, /* next */ |
| 974 | 1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */ |
| 975 | 0, 0, /* Section pointers */ |
| 976 | OPS_MAGIC, /* Always the last thing */ |
| 977 | }; |
| 978 | |
| 979 | void |
| 980 | _initialize_remote_bug () |
| 981 | { |
| 982 | add_target (&bug_ops); |
| 983 | |
| 984 | add_show_from_set |
| 985 | (add_set_cmd ("srec-bytes", class_support, var_uinteger, |
| 986 | (char *) &srec_bytes, |
| 987 | "\ |
| 988 | Set the number of bytes represented in each S-record.\n\ |
| 989 | This affects the communication protocol with the remote target.", |
| 990 | &setlist), |
| 991 | &showlist); |
| 992 | |
| 993 | add_show_from_set |
| 994 | (add_set_cmd ("srec-max-retries", class_support, var_uinteger, |
| 995 | (char *) &srec_max_retries, |
| 996 | "\ |
| 997 | Set the number of retries for shipping S-records.\n\ |
| 998 | This affects the communication protocol with the remote target.", |
| 999 | &setlist), |
| 1000 | &showlist); |
| 1001 | |
| 1002 | add_show_from_set |
| 1003 | (add_set_cmd ("srec-frame", class_support, var_uinteger, |
| 1004 | (char *) &srec_frame, |
| 1005 | "\ |
| 1006 | Set the number of bytes in an S-record frame.\n\ |
| 1007 | This affects the communication protocol with the remote target.", |
| 1008 | &setlist), |
| 1009 | &showlist); |
| 1010 | |
| 1011 | add_show_from_set |
| 1012 | (add_set_cmd ("srec-noise", class_support, var_zinteger, |
| 1013 | (char *) &srec_noise, |
| 1014 | "\ |
| 1015 | Set number of S-record to send before deliberately flubbing a checksum.\n\ |
| 1016 | Zero means flub none at all. This affects the communication protocol\n\ |
| 1017 | with the remote target.", |
| 1018 | &setlist), |
| 1019 | &showlist); |
| 1020 | |
| 1021 | add_show_from_set |
| 1022 | (add_set_cmd ("srec-sleep", class_support, var_zinteger, |
| 1023 | (char *) &srec_sleep, |
| 1024 | "\ |
| 1025 | Set number of seconds to sleep after an S-record for a possible error message to arrive.\n\ |
| 1026 | This affects the communication protocol with the remote target.", |
| 1027 | &setlist), |
| 1028 | &showlist); |
| 1029 | |
| 1030 | add_show_from_set |
| 1031 | (add_set_cmd ("srec-echo-pace", class_support, var_boolean, |
| 1032 | (char *) &srec_echo_pace, |
| 1033 | "\ |
| 1034 | Set echo-verification.\n\ |
| 1035 | When on, use verification by echo when downloading S-records. This is\n\ |
| 1036 | much slower, but generally more reliable.", |
| 1037 | &setlist), |
| 1038 | &showlist); |
| 1039 | } |