| 1 | /* Remote target communications for serial-line targets using SDS' protocol. |
| 2 | Copyright 1997 Free Software Foundation, Inc. |
| 3 | |
| 4 | This file is part of GDB. |
| 5 | |
| 6 | This program is free software; you can redistribute it and/or modify |
| 7 | it under the terms of the GNU General Public License as published by |
| 8 | the Free Software Foundation; either version 2 of the License, or |
| 9 | (at your option) any later version. |
| 10 | |
| 11 | This program is distributed in the hope that it will be useful, |
| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 14 | GNU General Public License for more details. |
| 15 | |
| 16 | You should have received a copy of the GNU General Public License |
| 17 | along with this program; if not, write to the Free Software |
| 18 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ |
| 19 | |
| 20 | /* This interface was written by studying the behavior of the SDS |
| 21 | monitor on an ADS 821/860 board, and by consulting the |
| 22 | documentation of the monitor that is available on Motorola's web |
| 23 | site. -sts 8/13/97 */ |
| 24 | |
| 25 | #include "defs.h" |
| 26 | #include "gdb_string.h" |
| 27 | #include <fcntl.h> |
| 28 | #include "frame.h" |
| 29 | #include "inferior.h" |
| 30 | #include "bfd.h" |
| 31 | #include "symfile.h" |
| 32 | #include "target.h" |
| 33 | #include "wait.h" |
| 34 | #include "gdbcmd.h" |
| 35 | #include "objfiles.h" |
| 36 | #include "gdb-stabs.h" |
| 37 | #include "gdbthread.h" |
| 38 | #include "gdbcore.h" |
| 39 | #include "dcache.h" |
| 40 | |
| 41 | #ifdef USG |
| 42 | #include <sys/types.h> |
| 43 | #endif |
| 44 | |
| 45 | #include <signal.h> |
| 46 | #include "serial.h" |
| 47 | |
| 48 | extern void _initialize_remote_sds PARAMS ((void)); |
| 49 | |
| 50 | /* Declarations of local functions. */ |
| 51 | |
| 52 | static int sds_write_bytes PARAMS ((CORE_ADDR, char *, int)); |
| 53 | |
| 54 | static int sds_read_bytes PARAMS ((CORE_ADDR, char *, int)); |
| 55 | |
| 56 | static void sds_files_info PARAMS ((struct target_ops *ignore)); |
| 57 | |
| 58 | static int sds_xfer_memory PARAMS ((CORE_ADDR, char *, |
| 59 | int, int, struct target_ops *)); |
| 60 | |
| 61 | static void sds_prepare_to_store PARAMS ((void)); |
| 62 | |
| 63 | static void sds_fetch_registers PARAMS ((int)); |
| 64 | |
| 65 | static void sds_resume PARAMS ((int, int, enum target_signal)); |
| 66 | |
| 67 | static int sds_start_remote PARAMS ((PTR)); |
| 68 | |
| 69 | static void sds_open PARAMS ((char *, int)); |
| 70 | |
| 71 | static void sds_close PARAMS ((int)); |
| 72 | |
| 73 | static void sds_store_registers PARAMS ((int)); |
| 74 | |
| 75 | static void sds_mourn PARAMS ((void)); |
| 76 | |
| 77 | static void sds_create_inferior PARAMS ((char *, char *, char **)); |
| 78 | |
| 79 | static void sds_load PARAMS ((char *, int)); |
| 80 | |
| 81 | static int getmessage PARAMS ((unsigned char *, int)); |
| 82 | |
| 83 | static int putmessage PARAMS ((unsigned char *, int)); |
| 84 | |
| 85 | static int sds_send PARAMS ((unsigned char *, int)); |
| 86 | |
| 87 | static int readchar PARAMS ((int)); |
| 88 | |
| 89 | static int sds_wait PARAMS ((int, struct target_waitstatus *)); |
| 90 | |
| 91 | static void sds_kill PARAMS ((void)); |
| 92 | |
| 93 | static int tohex PARAMS ((int)); |
| 94 | |
| 95 | static int fromhex PARAMS ((int)); |
| 96 | |
| 97 | static void sds_detach PARAMS ((char *, int)); |
| 98 | |
| 99 | static void sds_interrupt PARAMS ((int)); |
| 100 | |
| 101 | static void sds_interrupt_twice PARAMS ((int)); |
| 102 | |
| 103 | static void interrupt_query PARAMS ((void)); |
| 104 | |
| 105 | static int read_frame PARAMS ((char *)); |
| 106 | |
| 107 | static int sds_insert_breakpoint PARAMS ((CORE_ADDR, char *)); |
| 108 | |
| 109 | static int sds_remove_breakpoint PARAMS ((CORE_ADDR, char *)); |
| 110 | |
| 111 | static void init_sds_ops PARAMS ((void)); |
| 112 | |
| 113 | static void sds_command PARAMS ((char *args, int from_tty)); |
| 114 | |
| 115 | /* Define the target operations vector. */ |
| 116 | |
| 117 | static struct target_ops sds_ops; |
| 118 | |
| 119 | /* This was 5 seconds, which is a long time to sit and wait. |
| 120 | Unless this is going though some terminal server or multiplexer or |
| 121 | other form of hairy serial connection, I would think 2 seconds would |
| 122 | be plenty. */ |
| 123 | |
| 124 | static int sds_timeout = 2; |
| 125 | |
| 126 | /* Descriptor for I/O to remote machine. Initialize it to NULL so |
| 127 | that sds_open knows that we don't have a file open when the program |
| 128 | starts. */ |
| 129 | |
| 130 | static serial_t sds_desc = NULL; |
| 131 | |
| 132 | /* This limit comes from the monitor. */ |
| 133 | |
| 134 | #define PBUFSIZ 250 |
| 135 | |
| 136 | /* Maximum number of bytes to read/write at once. The value here |
| 137 | is chosen to fill up a packet (the headers account for the 32). */ |
| 138 | #define MAXBUFBYTES ((PBUFSIZ-32)/2) |
| 139 | |
| 140 | static int next_msg_id; |
| 141 | |
| 142 | static int just_started; |
| 143 | |
| 144 | static int message_pending; |
| 145 | |
| 146 | \f |
| 147 | /* Clean up connection to a remote debugger. */ |
| 148 | |
| 149 | /* ARGSUSED */ |
| 150 | static void |
| 151 | sds_close (quitting) |
| 152 | int quitting; |
| 153 | { |
| 154 | if (sds_desc) |
| 155 | SERIAL_CLOSE (sds_desc); |
| 156 | sds_desc = NULL; |
| 157 | } |
| 158 | |
| 159 | /* Stub for catch_errors. */ |
| 160 | |
| 161 | static int |
| 162 | sds_start_remote (dummy) |
| 163 | PTR dummy; |
| 164 | { |
| 165 | char c; |
| 166 | unsigned char buf[200]; |
| 167 | |
| 168 | immediate_quit = 1; /* Allow user to interrupt it */ |
| 169 | |
| 170 | /* Ack any packet which the remote side has already sent. */ |
| 171 | SERIAL_WRITE (sds_desc, "{#*\r\n", 5); |
| 172 | SERIAL_WRITE (sds_desc, "{#}\r\n", 5); |
| 173 | |
| 174 | while ((c = readchar (1)) >= 0) |
| 175 | printf_unfiltered ("%c", c); |
| 176 | printf_unfiltered ("\n"); |
| 177 | |
| 178 | next_msg_id = 251; |
| 179 | |
| 180 | buf[0] = 26; |
| 181 | sds_send (buf, 1); |
| 182 | |
| 183 | buf[0] = 0; |
| 184 | sds_send (buf, 1); |
| 185 | |
| 186 | immediate_quit = 0; |
| 187 | |
| 188 | start_remote (); /* Initialize gdb process mechanisms */ |
| 189 | return 1; |
| 190 | } |
| 191 | |
| 192 | /* Open a connection to a remote debugger. |
| 193 | NAME is the filename used for communication. */ |
| 194 | |
| 195 | static DCACHE *sds_dcache; |
| 196 | |
| 197 | static void |
| 198 | sds_open (name, from_tty) |
| 199 | char *name; |
| 200 | int from_tty; |
| 201 | { |
| 202 | if (name == 0) |
| 203 | error ("To open a remote debug connection, you need to specify what serial\n\ |
| 204 | device is attached to the remote system (e.g. /dev/ttya)."); |
| 205 | |
| 206 | target_preopen (from_tty); |
| 207 | |
| 208 | unpush_target (&sds_ops); |
| 209 | |
| 210 | sds_dcache = dcache_init (sds_read_bytes, sds_write_bytes); |
| 211 | |
| 212 | sds_desc = SERIAL_OPEN (name); |
| 213 | if (!sds_desc) |
| 214 | perror_with_name (name); |
| 215 | |
| 216 | if (baud_rate != -1) |
| 217 | { |
| 218 | if (SERIAL_SETBAUDRATE (sds_desc, baud_rate)) |
| 219 | { |
| 220 | SERIAL_CLOSE (sds_desc); |
| 221 | perror_with_name (name); |
| 222 | } |
| 223 | } |
| 224 | |
| 225 | |
| 226 | SERIAL_RAW (sds_desc); |
| 227 | |
| 228 | /* If there is something sitting in the buffer we might take it as a |
| 229 | response to a command, which would be bad. */ |
| 230 | SERIAL_FLUSH_INPUT (sds_desc); |
| 231 | |
| 232 | if (from_tty) |
| 233 | { |
| 234 | puts_filtered ("Remote debugging using "); |
| 235 | puts_filtered (name); |
| 236 | puts_filtered ("\n"); |
| 237 | } |
| 238 | push_target (&sds_ops); /* Switch to using remote target now */ |
| 239 | |
| 240 | just_started = 1; |
| 241 | |
| 242 | /* Start the remote connection; if error (0), discard this target. |
| 243 | In particular, if the user quits, be sure to discard it (we'd be |
| 244 | in an inconsistent state otherwise). */ |
| 245 | if (!catch_errors (sds_start_remote, NULL, |
| 246 | "Couldn't establish connection to remote target\n", |
| 247 | RETURN_MASK_ALL)) |
| 248 | pop_target (); |
| 249 | } |
| 250 | |
| 251 | /* This takes a program previously attached to and detaches it. After |
| 252 | this is done, GDB can be used to debug some other program. We |
| 253 | better not have left any breakpoints in the target program or it'll |
| 254 | die when it hits one. */ |
| 255 | |
| 256 | static void |
| 257 | sds_detach (args, from_tty) |
| 258 | char *args; |
| 259 | int from_tty; |
| 260 | { |
| 261 | char buf[PBUFSIZ]; |
| 262 | |
| 263 | if (args) |
| 264 | error ("Argument given to \"detach\" when remotely debugging."); |
| 265 | |
| 266 | #if 0 |
| 267 | /* Tell the remote target to detach. */ |
| 268 | strcpy (buf, "D"); |
| 269 | sds_send (buf, 1); |
| 270 | #endif |
| 271 | |
| 272 | pop_target (); |
| 273 | if (from_tty) |
| 274 | puts_filtered ("Ending remote debugging.\n"); |
| 275 | } |
| 276 | |
| 277 | /* Convert hex digit A to a number. */ |
| 278 | |
| 279 | static int |
| 280 | fromhex (a) |
| 281 | int a; |
| 282 | { |
| 283 | if (a >= '0' && a <= '9') |
| 284 | return a - '0'; |
| 285 | else if (a >= 'a' && a <= 'f') |
| 286 | return a - 'a' + 10; |
| 287 | else |
| 288 | error ("Reply contains invalid hex digit %d", a); |
| 289 | } |
| 290 | |
| 291 | /* Convert number NIB to a hex digit. */ |
| 292 | |
| 293 | static int |
| 294 | tohex (nib) |
| 295 | int nib; |
| 296 | { |
| 297 | if (nib < 10) |
| 298 | return '0'+nib; |
| 299 | else |
| 300 | return 'a'+nib-10; |
| 301 | } |
| 302 | |
| 303 | static int |
| 304 | tob64 (inbuf, outbuf, len) |
| 305 | unsigned char *inbuf; |
| 306 | char *outbuf; |
| 307 | int len; |
| 308 | { |
| 309 | int i, sum; |
| 310 | char *p; |
| 311 | |
| 312 | if (len % 3 != 0) |
| 313 | error ("bad length"); |
| 314 | |
| 315 | p = outbuf; |
| 316 | for (i = 0; i < len; i += 3) |
| 317 | { |
| 318 | /* Collect the next three bytes into a number. */ |
| 319 | sum = ((long) *inbuf++) << 16; |
| 320 | sum |= ((long) *inbuf++) << 8; |
| 321 | sum |= ((long) *inbuf++); |
| 322 | |
| 323 | /* Spit out 4 6-bit encodings. */ |
| 324 | *p++ = ((sum >> 18) & 0x3f) + '0'; |
| 325 | *p++ = ((sum >> 12) & 0x3f) + '0'; |
| 326 | *p++ = ((sum >> 6) & 0x3f) + '0'; |
| 327 | *p++ = (sum & 0x3f) + '0'; |
| 328 | } |
| 329 | return (p - outbuf); |
| 330 | } |
| 331 | |
| 332 | static int |
| 333 | fromb64 (inbuf, outbuf, len) |
| 334 | char *inbuf, *outbuf; |
| 335 | int len; |
| 336 | { |
| 337 | int i, sum; |
| 338 | |
| 339 | if (len % 4 != 0) |
| 340 | error ("bad length"); |
| 341 | |
| 342 | for (i = 0; i < len; i += 4) |
| 343 | { |
| 344 | /* Collect 4 6-bit digits. */ |
| 345 | sum = (*inbuf++ - '0') << 18; |
| 346 | sum |= (*inbuf++ - '0') << 12; |
| 347 | sum |= (*inbuf++ - '0') << 6; |
| 348 | sum |= (*inbuf++ - '0'); |
| 349 | |
| 350 | /* Now take the resulting 24-bit number and get three bytes out |
| 351 | of it. */ |
| 352 | *outbuf++ = (sum >> 16) & 0xff; |
| 353 | *outbuf++ = (sum >> 8) & 0xff; |
| 354 | *outbuf++ = sum & 0xff; |
| 355 | } |
| 356 | |
| 357 | return (len / 4) * 3; |
| 358 | } |
| 359 | |
| 360 | \f |
| 361 | /* Tell the remote machine to resume. */ |
| 362 | |
| 363 | static enum target_signal last_sent_signal = TARGET_SIGNAL_0; |
| 364 | int last_sent_step; |
| 365 | |
| 366 | static void |
| 367 | sds_resume (pid, step, siggnal) |
| 368 | int pid, step; |
| 369 | enum target_signal siggnal; |
| 370 | { |
| 371 | unsigned char buf[PBUFSIZ]; |
| 372 | |
| 373 | dcache_flush (sds_dcache); |
| 374 | |
| 375 | last_sent_signal = siggnal; |
| 376 | last_sent_step = step; |
| 377 | |
| 378 | buf[0] = (step ? 21 : 20); |
| 379 | buf[1] = 0; /* (should be signal?) */ |
| 380 | |
| 381 | sds_send (buf, 2); |
| 382 | } |
| 383 | \f |
| 384 | /* Send a message to target to halt it. Target will respond, and send |
| 385 | us a message pending notice. */ |
| 386 | |
| 387 | static void |
| 388 | sds_interrupt (signo) |
| 389 | int signo; |
| 390 | { |
| 391 | unsigned char buf[PBUFSIZ]; |
| 392 | |
| 393 | /* If this doesn't work, try more severe steps. */ |
| 394 | signal (signo, sds_interrupt_twice); |
| 395 | |
| 396 | if (remote_debug) |
| 397 | printf_unfiltered ("sds_interrupt called\n"); |
| 398 | |
| 399 | buf[0] = 25; |
| 400 | sds_send (buf, 1); |
| 401 | } |
| 402 | |
| 403 | static void (*ofunc)(); |
| 404 | |
| 405 | /* The user typed ^C twice. */ |
| 406 | |
| 407 | static void |
| 408 | sds_interrupt_twice (signo) |
| 409 | int signo; |
| 410 | { |
| 411 | signal (signo, ofunc); |
| 412 | |
| 413 | interrupt_query (); |
| 414 | |
| 415 | signal (signo, sds_interrupt); |
| 416 | } |
| 417 | |
| 418 | /* Ask the user what to do when an interrupt is received. */ |
| 419 | |
| 420 | static void |
| 421 | interrupt_query () |
| 422 | { |
| 423 | target_terminal_ours (); |
| 424 | |
| 425 | if (query ("Interrupted while waiting for the program.\n\ |
| 426 | Give up (and stop debugging it)? ")) |
| 427 | { |
| 428 | target_mourn_inferior (); |
| 429 | return_to_top_level (RETURN_QUIT); |
| 430 | } |
| 431 | |
| 432 | target_terminal_inferior (); |
| 433 | } |
| 434 | |
| 435 | /* If nonzero, ignore the next kill. */ |
| 436 | int kill_kludge; |
| 437 | |
| 438 | /* Wait until the remote machine stops, then return, storing status in |
| 439 | STATUS just as `wait' would. Returns "pid" (though it's not clear |
| 440 | what, if anything, that means in the case of this target). */ |
| 441 | |
| 442 | static int |
| 443 | sds_wait (pid, status) |
| 444 | int pid; |
| 445 | struct target_waitstatus *status; |
| 446 | { |
| 447 | unsigned char buf[PBUFSIZ]; |
| 448 | int retlen; |
| 449 | |
| 450 | status->kind = TARGET_WAITKIND_EXITED; |
| 451 | status->value.integer = 0; |
| 452 | |
| 453 | ofunc = (void (*)()) signal (SIGINT, sds_interrupt); |
| 454 | |
| 455 | signal (SIGINT, ofunc); |
| 456 | |
| 457 | if (just_started) |
| 458 | { |
| 459 | just_started = 0; |
| 460 | status->kind = TARGET_WAITKIND_STOPPED; |
| 461 | return inferior_pid; |
| 462 | } |
| 463 | |
| 464 | while (1) |
| 465 | { |
| 466 | getmessage (buf, 1); |
| 467 | |
| 468 | if (message_pending) |
| 469 | { |
| 470 | buf[0] = 26; |
| 471 | retlen = sds_send (buf, 1); |
| 472 | if (remote_debug) |
| 473 | { |
| 474 | fprintf_unfiltered (gdb_stderr, "Signals: %04x %02x %02x\n", |
| 475 | ((int) buf[0]) << 8 + buf[1], |
| 476 | buf[2], buf[3]); |
| 477 | } |
| 478 | message_pending = 0; |
| 479 | status->kind = TARGET_WAITKIND_STOPPED; |
| 480 | status->value.sig = TARGET_SIGNAL_TRAP; |
| 481 | goto got_status; |
| 482 | } |
| 483 | } |
| 484 | got_status: |
| 485 | return inferior_pid; |
| 486 | } |
| 487 | |
| 488 | static unsigned char sprs[16]; |
| 489 | |
| 490 | /* Read the remote registers into the block REGS. */ |
| 491 | /* Currently we just read all the registers, so we don't use regno. */ |
| 492 | |
| 493 | /* ARGSUSED */ |
| 494 | static void |
| 495 | sds_fetch_registers (regno) |
| 496 | int regno; |
| 497 | { |
| 498 | unsigned char buf[PBUFSIZ]; |
| 499 | int i, retlen; |
| 500 | char *p; |
| 501 | char regs[REGISTER_BYTES]; |
| 502 | |
| 503 | /* Unimplemented registers read as all bits zero. */ |
| 504 | memset (regs, 0, REGISTER_BYTES); |
| 505 | |
| 506 | buf[0] = 18; |
| 507 | buf[1] = 1; |
| 508 | buf[2] = 0; |
| 509 | retlen = sds_send (buf, 3); |
| 510 | |
| 511 | for (i = 0; i < 4 * 6; ++i) |
| 512 | regs[i + 4 * 32 + 8 * 32] = buf[i]; |
| 513 | for (i = 0; i < 4 * 4; ++i) |
| 514 | sprs[i] = buf[i + 4 * 7]; |
| 515 | |
| 516 | buf[0] = 18; |
| 517 | buf[1] = 2; |
| 518 | buf[2] = 0; |
| 519 | retlen = sds_send (buf, 3); |
| 520 | |
| 521 | for (i = 0; i < retlen; i++) |
| 522 | regs[i] = buf[i]; |
| 523 | |
| 524 | /* (should warn about reply too short) */ |
| 525 | |
| 526 | for (i = 0; i < NUM_REGS; i++) |
| 527 | supply_register (i, ®s[REGISTER_BYTE(i)]); |
| 528 | } |
| 529 | |
| 530 | /* Prepare to store registers. Since we may send them all, we have to |
| 531 | read out the ones we don't want to change first. */ |
| 532 | |
| 533 | static void |
| 534 | sds_prepare_to_store () |
| 535 | { |
| 536 | /* Make sure the entire registers array is valid. */ |
| 537 | read_register_bytes (0, (char *)NULL, REGISTER_BYTES); |
| 538 | } |
| 539 | |
| 540 | /* Store register REGNO, or all registers if REGNO == -1, from the contents |
| 541 | of REGISTERS. FIXME: ignores errors. */ |
| 542 | |
| 543 | static void |
| 544 | sds_store_registers (regno) |
| 545 | int regno; |
| 546 | { |
| 547 | unsigned char *p, buf[PBUFSIZ]; |
| 548 | int i; |
| 549 | |
| 550 | /* Store all the special-purpose registers. */ |
| 551 | p = buf; |
| 552 | *p++ = 19; |
| 553 | *p++ = 1; |
| 554 | *p++ = 0; |
| 555 | *p++ = 0; |
| 556 | for (i = 0; i < 4 * 6; i++) |
| 557 | *p++ = registers[i + 4 * 32 + 8 * 32]; |
| 558 | for (i = 0; i < 4 * 1; i++) |
| 559 | *p++ = 0; |
| 560 | for (i = 0; i < 4 * 4; i++) |
| 561 | *p++ = sprs[i]; |
| 562 | |
| 563 | sds_send (buf, p - buf); |
| 564 | |
| 565 | /* Store all the general-purpose registers. */ |
| 566 | p = buf; |
| 567 | *p++ = 19; |
| 568 | *p++ = 2; |
| 569 | *p++ = 0; |
| 570 | *p++ = 0; |
| 571 | for (i = 0; i < 4 * 32; i++) |
| 572 | *p++ = registers[i]; |
| 573 | |
| 574 | sds_send (buf, p - buf); |
| 575 | |
| 576 | } |
| 577 | \f |
| 578 | /* Write memory data directly to the remote machine. This does not |
| 579 | inform the data cache; the data cache uses this. MEMADDR is the |
| 580 | address in the remote memory space. MYADDR is the address of the |
| 581 | buffer in our space. LEN is the number of bytes. |
| 582 | |
| 583 | Returns number of bytes transferred, or 0 for error. */ |
| 584 | |
| 585 | static int |
| 586 | sds_write_bytes (memaddr, myaddr, len) |
| 587 | CORE_ADDR memaddr; |
| 588 | char *myaddr; |
| 589 | int len; |
| 590 | { |
| 591 | int max_buf_size; /* Max size of packet output buffer */ |
| 592 | int origlen; |
| 593 | unsigned char buf[PBUFSIZ]; |
| 594 | int todo; |
| 595 | int i; |
| 596 | |
| 597 | /* Chop the transfer down if necessary */ |
| 598 | |
| 599 | max_buf_size = 150; |
| 600 | |
| 601 | origlen = len; |
| 602 | while (len > 0) |
| 603 | { |
| 604 | todo = min (len, max_buf_size); |
| 605 | |
| 606 | buf[0] = 13; |
| 607 | buf[1] = 0; |
| 608 | buf[2] = (int) (memaddr >> 24) & 0xff; |
| 609 | buf[3] = (int) (memaddr >> 16) & 0xff; |
| 610 | buf[4] = (int) (memaddr >> 8) & 0xff; |
| 611 | buf[5] = (int) (memaddr ) & 0xff; |
| 612 | buf[6] = 1; |
| 613 | buf[7] = 0; |
| 614 | |
| 615 | for (i = 0; i < todo; i++) |
| 616 | buf[i + 8] = myaddr[i]; |
| 617 | |
| 618 | sds_send (buf, 8 + todo); |
| 619 | |
| 620 | /* (should look at result) */ |
| 621 | |
| 622 | myaddr += todo; |
| 623 | memaddr += todo; |
| 624 | len -= todo; |
| 625 | } |
| 626 | return origlen; |
| 627 | } |
| 628 | |
| 629 | /* Read memory data directly from the remote machine. This does not |
| 630 | use the data cache; the data cache uses this. MEMADDR is the |
| 631 | address in the remote memory space. MYADDR is the address of the |
| 632 | buffer in our space. LEN is the number of bytes. |
| 633 | |
| 634 | Returns number of bytes transferred, or 0 for error. */ |
| 635 | |
| 636 | static int |
| 637 | sds_read_bytes (memaddr, myaddr, len) |
| 638 | CORE_ADDR memaddr; |
| 639 | char *myaddr; |
| 640 | int len; |
| 641 | { |
| 642 | int max_buf_size; /* Max size of packet output buffer */ |
| 643 | int origlen, retlen; |
| 644 | unsigned char buf[PBUFSIZ]; |
| 645 | int todo; |
| 646 | int i; |
| 647 | |
| 648 | /* Chop the transfer down if necessary */ |
| 649 | |
| 650 | max_buf_size = 150; |
| 651 | |
| 652 | origlen = len; |
| 653 | while (len > 0) |
| 654 | { |
| 655 | todo = min (len, max_buf_size); |
| 656 | |
| 657 | buf[0] = 12; |
| 658 | buf[1] = 0; |
| 659 | buf[2] = (int) (memaddr >> 24) & 0xff; |
| 660 | buf[3] = (int) (memaddr >> 16) & 0xff; |
| 661 | buf[4] = (int) (memaddr >> 8) & 0xff; |
| 662 | buf[5] = (int) (memaddr ) & 0xff; |
| 663 | buf[6] = (int) (todo >> 8) & 0xff; |
| 664 | buf[7] = (int) (todo ) & 0xff; |
| 665 | buf[8] = 1; |
| 666 | |
| 667 | retlen = sds_send (buf, 9); |
| 668 | |
| 669 | if (retlen - 2 != todo) |
| 670 | { |
| 671 | return 0; |
| 672 | } |
| 673 | |
| 674 | /* Reply describes memory byte by byte. */ |
| 675 | |
| 676 | for (i = 0; i < todo; i++) |
| 677 | myaddr[i] = buf[i + 2]; |
| 678 | |
| 679 | myaddr += todo; |
| 680 | memaddr += todo; |
| 681 | len -= todo; |
| 682 | } |
| 683 | |
| 684 | return origlen; |
| 685 | } |
| 686 | \f |
| 687 | /* Read or write LEN bytes from inferior memory at MEMADDR, |
| 688 | transferring to or from debugger address MYADDR. Write to inferior |
| 689 | if SHOULD_WRITE is nonzero. Returns length of data written or |
| 690 | read; 0 for error. */ |
| 691 | |
| 692 | /* ARGSUSED */ |
| 693 | static int |
| 694 | sds_xfer_memory(memaddr, myaddr, len, should_write, target) |
| 695 | CORE_ADDR memaddr; |
| 696 | char *myaddr; |
| 697 | int len; |
| 698 | int should_write; |
| 699 | struct target_ops *target; /* ignored */ |
| 700 | { |
| 701 | return dcache_xfer_memory (sds_dcache, memaddr, myaddr, len, should_write); |
| 702 | } |
| 703 | |
| 704 | \f |
| 705 | static void |
| 706 | sds_files_info (ignore) |
| 707 | struct target_ops *ignore; |
| 708 | { |
| 709 | puts_filtered ("Debugging over a serial connection, using SDS protocol.\n"); |
| 710 | } |
| 711 | \f |
| 712 | /* Stuff for dealing with the packets which are part of this protocol. |
| 713 | See comment at top of file for details. */ |
| 714 | |
| 715 | /* Read a single character from the remote end, masking it down to 7 bits. */ |
| 716 | |
| 717 | static int |
| 718 | readchar (timeout) |
| 719 | int timeout; |
| 720 | { |
| 721 | int ch; |
| 722 | |
| 723 | ch = SERIAL_READCHAR (sds_desc, timeout); |
| 724 | |
| 725 | if (remote_debug > 1 && ch >= 0) |
| 726 | printf_unfiltered("%c(%x)", ch, ch); |
| 727 | |
| 728 | switch (ch) |
| 729 | { |
| 730 | case SERIAL_EOF: |
| 731 | error ("Remote connection closed"); |
| 732 | case SERIAL_ERROR: |
| 733 | perror_with_name ("Remote communication error"); |
| 734 | case SERIAL_TIMEOUT: |
| 735 | return ch; |
| 736 | default: |
| 737 | return ch & 0x7f; |
| 738 | } |
| 739 | } |
| 740 | |
| 741 | /* An SDS-style checksum is a sum of the bytes modulo 253. (Presumably |
| 742 | because 253, 254, and 255 are special flags in the protocol.) */ |
| 743 | |
| 744 | static int |
| 745 | compute_checksum (csum, buf, len) |
| 746 | int csum, len; |
| 747 | char *buf; |
| 748 | { |
| 749 | int i; |
| 750 | |
| 751 | for (i = 0; i < len; ++i) |
| 752 | csum += (unsigned char) buf[i]; |
| 753 | |
| 754 | csum %= 253; |
| 755 | return csum; |
| 756 | } |
| 757 | |
| 758 | /* Send the command in BUF to the remote machine, and read the reply |
| 759 | into BUF also. */ |
| 760 | |
| 761 | static int |
| 762 | sds_send (buf, len) |
| 763 | unsigned char *buf; |
| 764 | int len; |
| 765 | { |
| 766 | putmessage (buf, len); |
| 767 | |
| 768 | return getmessage (buf, 0); |
| 769 | } |
| 770 | |
| 771 | /* Send a message to the remote machine. */ |
| 772 | |
| 773 | static int |
| 774 | putmessage (buf, len) |
| 775 | unsigned char *buf; |
| 776 | int len; |
| 777 | { |
| 778 | int i, enclen; |
| 779 | unsigned char csum = 0; |
| 780 | char buf2[PBUFSIZ], buf3[PBUFSIZ]; |
| 781 | unsigned char header[3]; |
| 782 | int ch; |
| 783 | int tcount = 0; |
| 784 | char *p; |
| 785 | |
| 786 | /* Copy the packet into buffer BUF2, encapsulating it |
| 787 | and giving it a checksum. */ |
| 788 | |
| 789 | if (len > 170) /* Prosanity check */ |
| 790 | abort(); |
| 791 | |
| 792 | if (remote_debug) |
| 793 | { |
| 794 | fprintf_unfiltered (gdb_stderr, "Message to send: \""); |
| 795 | for (i = 0; i < len; ++i) |
| 796 | fprintf_unfiltered (gdb_stderr, "%02x", buf[i]); |
| 797 | fprintf_unfiltered (gdb_stderr, "\"\n"); |
| 798 | } |
| 799 | |
| 800 | p = buf2; |
| 801 | *p++ = '$'; |
| 802 | |
| 803 | if (len % 3 != 0) |
| 804 | { |
| 805 | buf[len] = '\0'; |
| 806 | buf[len+1] = '\0'; |
| 807 | } |
| 808 | |
| 809 | header[1] = next_msg_id; |
| 810 | |
| 811 | header[2] = len; |
| 812 | |
| 813 | csum = compute_checksum (csum, buf, len); |
| 814 | csum = compute_checksum (csum, header + 1, 2); |
| 815 | |
| 816 | header[0] = csum; |
| 817 | |
| 818 | tob64 (header, p, 3); |
| 819 | p += 4; |
| 820 | enclen = tob64 (buf, buf3, ((len + 2) / 3) * 3); |
| 821 | |
| 822 | for (i = 0; i < enclen; ++i) |
| 823 | *p++ = buf3[i]; |
| 824 | *p++ = '\r'; |
| 825 | *p++ = '\n'; |
| 826 | |
| 827 | next_msg_id = (next_msg_id + 3) % 245; |
| 828 | |
| 829 | /* Send it over and over until we get a positive ack. */ |
| 830 | |
| 831 | while (1) |
| 832 | { |
| 833 | int started_error_output = 0; |
| 834 | |
| 835 | if (remote_debug) |
| 836 | { |
| 837 | *p = '\0'; |
| 838 | printf_unfiltered ("Sending encoded: \"%s\"", buf2); |
| 839 | printf_unfiltered (" (Checksum %d, id %d, length %d)\n", |
| 840 | header[0], header[1], header[2]); |
| 841 | gdb_flush (gdb_stdout); |
| 842 | } |
| 843 | if (SERIAL_WRITE (sds_desc, buf2, p - buf2)) |
| 844 | perror_with_name ("putmessage: write failed"); |
| 845 | |
| 846 | return 1; |
| 847 | |
| 848 | } |
| 849 | |
| 850 | } |
| 851 | |
| 852 | /* Come here after finding the start of the frame. Collect the rest |
| 853 | into BUF. Returns 0 on any error, 1 on success. */ |
| 854 | |
| 855 | static int |
| 856 | read_frame (buf) |
| 857 | char *buf; |
| 858 | { |
| 859 | char *bp; |
| 860 | int c; |
| 861 | |
| 862 | bp = buf; |
| 863 | |
| 864 | while (1) |
| 865 | { |
| 866 | c = readchar (sds_timeout); |
| 867 | |
| 868 | switch (c) |
| 869 | { |
| 870 | case SERIAL_TIMEOUT: |
| 871 | if (remote_debug) |
| 872 | puts_filtered ("Timeout in mid-message, retrying\n"); |
| 873 | return 0; |
| 874 | case '$': |
| 875 | if (remote_debug) |
| 876 | puts_filtered ("Saw new packet start in middle of old one\n"); |
| 877 | return 0; /* Start a new packet, count retries */ |
| 878 | case '\r': |
| 879 | break; |
| 880 | |
| 881 | case '\n': |
| 882 | { |
| 883 | *bp = '\000'; |
| 884 | if (remote_debug) |
| 885 | fprintf_unfiltered (gdb_stderr, "Received encoded: \"%s\"\n", |
| 886 | buf); |
| 887 | return 1; |
| 888 | } |
| 889 | |
| 890 | default: |
| 891 | if (bp < buf + PBUFSIZ - 1) |
| 892 | { |
| 893 | *bp++ = c; |
| 894 | continue; |
| 895 | } |
| 896 | |
| 897 | *bp = '\0'; |
| 898 | puts_filtered ("Message too long: "); |
| 899 | puts_filtered (buf); |
| 900 | puts_filtered ("\n"); |
| 901 | |
| 902 | return 0; |
| 903 | } |
| 904 | } |
| 905 | } |
| 906 | |
| 907 | /* Read a packet from the remote machine, with error checking, |
| 908 | and store it in BUF. BUF is expected to be of size PBUFSIZ. |
| 909 | If FOREVER, wait forever rather than timing out; this is used |
| 910 | while the target is executing user code. */ |
| 911 | |
| 912 | static int |
| 913 | getmessage (buf, forever) |
| 914 | unsigned char *buf; |
| 915 | int forever; |
| 916 | { |
| 917 | int c, c2, c3; |
| 918 | int tries; |
| 919 | int timeout; |
| 920 | int val, i, len, csum; |
| 921 | unsigned char header[3]; |
| 922 | unsigned char inbuf[500]; |
| 923 | |
| 924 | strcpy (buf, "timeout"); |
| 925 | |
| 926 | if (forever) |
| 927 | { |
| 928 | #ifdef MAINTENANCE_CMDS |
| 929 | timeout = watchdog > 0 ? watchdog : -1; |
| 930 | #else |
| 931 | timeout = -1; |
| 932 | #endif |
| 933 | } |
| 934 | |
| 935 | else |
| 936 | timeout = sds_timeout; |
| 937 | |
| 938 | #define MAX_TRIES 3 |
| 939 | |
| 940 | for (tries = 1; tries <= MAX_TRIES; tries++) |
| 941 | { |
| 942 | /* This can loop forever if the remote side sends us characters |
| 943 | continuously, but if it pauses, we'll get a zero from readchar |
| 944 | because of timeout. Then we'll count that as a retry. */ |
| 945 | |
| 946 | /* Note that we will only wait forever prior to the start of a packet. |
| 947 | After that, we expect characters to arrive at a brisk pace. They |
| 948 | should show up within sds_timeout intervals. */ |
| 949 | |
| 950 | do |
| 951 | { |
| 952 | c = readchar (timeout); |
| 953 | |
| 954 | if (c == SERIAL_TIMEOUT) |
| 955 | { |
| 956 | #ifdef MAINTENANCE_CMDS |
| 957 | if (forever) /* Watchdog went off. Kill the target. */ |
| 958 | { |
| 959 | target_mourn_inferior (); |
| 960 | error ("Watchdog has expired. Target detached.\n"); |
| 961 | } |
| 962 | #endif |
| 963 | if (remote_debug) |
| 964 | puts_filtered ("Timed out.\n"); |
| 965 | goto retry; |
| 966 | } |
| 967 | } |
| 968 | while (c != '$' && c != '{'); |
| 969 | |
| 970 | /* We might have seen a "trigraph", a sequence of three characters |
| 971 | that indicate various sorts of communication state. */ |
| 972 | |
| 973 | if (c == '{') |
| 974 | { |
| 975 | /* Read the other two chars of the trigraph. */ |
| 976 | c2 = readchar (timeout); |
| 977 | c3 = readchar (timeout); |
| 978 | if (remote_debug) |
| 979 | fprintf_unfiltered (gdb_stderr, "Trigraph %c%c%c received\n", |
| 980 | c, c2, c3); |
| 981 | if (c3 == '+') |
| 982 | { |
| 983 | message_pending = 1; |
| 984 | return 0; /*????*/ |
| 985 | } |
| 986 | continue; |
| 987 | } |
| 988 | |
| 989 | val = read_frame (inbuf); |
| 990 | |
| 991 | if (val == 1) |
| 992 | { |
| 993 | fromb64 (inbuf, header, 4); |
| 994 | /* (should check out other bits) */ |
| 995 | fromb64 (inbuf + 4, buf, strlen (inbuf) - 4); |
| 996 | |
| 997 | len = header[2]; |
| 998 | |
| 999 | csum = 0; |
| 1000 | csum = compute_checksum (csum, buf, len); |
| 1001 | csum = compute_checksum (csum, header + 1, 2); |
| 1002 | |
| 1003 | if (csum != header[0]) |
| 1004 | fprintf_unfiltered (gdb_stderr, |
| 1005 | "Checksum mismatch: computed %d, received %d\n", |
| 1006 | csum, header[0]); |
| 1007 | |
| 1008 | if (header[2] == 0xff) |
| 1009 | fprintf_unfiltered (gdb_stderr, "Requesting resend...\n"); |
| 1010 | |
| 1011 | if (remote_debug) |
| 1012 | { |
| 1013 | fprintf_unfiltered (gdb_stderr, |
| 1014 | "... (Got checksum %d, id %d, length %d)\n", |
| 1015 | header[0], header[1], header[2]); |
| 1016 | fprintf_unfiltered (gdb_stderr, "Message received: \""); |
| 1017 | for (i = 0; i < len; ++i) |
| 1018 | { |
| 1019 | fprintf_unfiltered (gdb_stderr, "%02x", (unsigned char) buf[i]); |
| 1020 | } |
| 1021 | fprintf_unfiltered (gdb_stderr, "\"\n"); |
| 1022 | } |
| 1023 | |
| 1024 | /* no ack required? */ |
| 1025 | return len; |
| 1026 | } |
| 1027 | |
| 1028 | /* Try the whole thing again. */ |
| 1029 | retry: |
| 1030 | /* need to do something here */ |
| 1031 | } |
| 1032 | |
| 1033 | /* We have tried hard enough, and just can't receive the packet. Give up. */ |
| 1034 | |
| 1035 | printf_unfiltered ("Ignoring packet error, continuing...\n"); |
| 1036 | return 0; |
| 1037 | } |
| 1038 | \f |
| 1039 | static void |
| 1040 | sds_kill () |
| 1041 | { |
| 1042 | /* Don't try to do anything to the target. */ |
| 1043 | } |
| 1044 | |
| 1045 | static void |
| 1046 | sds_mourn () |
| 1047 | { |
| 1048 | unpush_target (&sds_ops); |
| 1049 | generic_mourn_inferior (); |
| 1050 | } |
| 1051 | |
| 1052 | static void |
| 1053 | sds_create_inferior (exec_file, args, env) |
| 1054 | char *exec_file; |
| 1055 | char *args; |
| 1056 | char **env; |
| 1057 | { |
| 1058 | inferior_pid = 42000; |
| 1059 | |
| 1060 | /* Clean up from the last time we were running. */ |
| 1061 | clear_proceed_status (); |
| 1062 | |
| 1063 | /* Let the remote process run. */ |
| 1064 | proceed (bfd_get_start_address (exec_bfd), TARGET_SIGNAL_0, 0); |
| 1065 | } |
| 1066 | |
| 1067 | static void |
| 1068 | sds_load (filename, from_tty) |
| 1069 | char *filename; |
| 1070 | int from_tty; |
| 1071 | { |
| 1072 | generic_load (filename, from_tty); |
| 1073 | |
| 1074 | inferior_pid = 0; |
| 1075 | } |
| 1076 | \f |
| 1077 | /* The SDS monitor has commands for breakpoint insertion, although it |
| 1078 | it doesn't actually manage the breakpoints, it just returns the |
| 1079 | replaced instruction back to the debugger. */ |
| 1080 | |
| 1081 | static int |
| 1082 | sds_insert_breakpoint (addr, contents_cache) |
| 1083 | CORE_ADDR addr; |
| 1084 | char *contents_cache; |
| 1085 | { |
| 1086 | int i, retlen; |
| 1087 | unsigned char *p, buf[PBUFSIZ]; |
| 1088 | |
| 1089 | p = buf; |
| 1090 | *p++ = 16; |
| 1091 | *p++ = 0; |
| 1092 | *p++ = (int) (addr >> 24) & 0xff; |
| 1093 | *p++ = (int) (addr >> 16) & 0xff; |
| 1094 | *p++ = (int) (addr >> 8) & 0xff; |
| 1095 | *p++ = (int) (addr ) & 0xff; |
| 1096 | |
| 1097 | retlen = sds_send (buf, p - buf); |
| 1098 | |
| 1099 | for (i = 0; i < 4; ++i) |
| 1100 | contents_cache[i] = buf[i + 2]; |
| 1101 | |
| 1102 | return 0; |
| 1103 | } |
| 1104 | |
| 1105 | static int |
| 1106 | sds_remove_breakpoint (addr, contents_cache) |
| 1107 | CORE_ADDR addr; |
| 1108 | char *contents_cache; |
| 1109 | { |
| 1110 | int i, retlen; |
| 1111 | unsigned char *p, buf[PBUFSIZ]; |
| 1112 | |
| 1113 | p = buf; |
| 1114 | *p++ = 17; |
| 1115 | *p++ = 0; |
| 1116 | *p++ = (int) (addr >> 24) & 0xff; |
| 1117 | *p++ = (int) (addr >> 16) & 0xff; |
| 1118 | *p++ = (int) (addr >> 8) & 0xff; |
| 1119 | *p++ = (int) (addr ) & 0xff; |
| 1120 | for (i = 0; i < 4; ++i) |
| 1121 | *p++ = contents_cache[i]; |
| 1122 | |
| 1123 | retlen = sds_send (buf, p - buf); |
| 1124 | |
| 1125 | return 0; |
| 1126 | } |
| 1127 | \f |
| 1128 | static void |
| 1129 | init_sds_ops () |
| 1130 | { |
| 1131 | sds_ops.to_shortname = "sds"; |
| 1132 | sds_ops.to_longname = "Remote serial target with SDS protocol"; |
| 1133 | sds_ops.to_doc = "Use a remote computer via a serial line; using the SDS protocol.\n\ |
| 1134 | Specify the serial device it is connected to (e.g. /dev/ttya)."; |
| 1135 | sds_ops.to_open = sds_open; |
| 1136 | sds_ops.to_close = sds_close; |
| 1137 | sds_ops.to_detach = sds_detach; |
| 1138 | sds_ops.to_resume = sds_resume; |
| 1139 | sds_ops.to_wait = sds_wait; |
| 1140 | sds_ops.to_fetch_registers = sds_fetch_registers; |
| 1141 | sds_ops.to_store_registers = sds_store_registers; |
| 1142 | sds_ops.to_prepare_to_store = sds_prepare_to_store; |
| 1143 | sds_ops.to_xfer_memory = sds_xfer_memory; |
| 1144 | sds_ops.to_files_info = sds_files_info; |
| 1145 | sds_ops.to_insert_breakpoint = sds_insert_breakpoint; |
| 1146 | sds_ops.to_remove_breakpoint = sds_remove_breakpoint; |
| 1147 | sds_ops.to_kill = sds_kill; |
| 1148 | sds_ops.to_load = sds_load; |
| 1149 | sds_ops.to_create_inferior = sds_create_inferior; |
| 1150 | sds_ops.to_mourn_inferior = sds_mourn; |
| 1151 | sds_ops.to_stratum = process_stratum; |
| 1152 | sds_ops.to_has_all_memory = 1; |
| 1153 | sds_ops.to_has_memory = 1; |
| 1154 | sds_ops.to_has_stack = 1; |
| 1155 | sds_ops.to_has_registers = 1; |
| 1156 | sds_ops.to_has_execution = 1; |
| 1157 | sds_ops.to_magic = OPS_MAGIC; |
| 1158 | } |
| 1159 | |
| 1160 | /* Put a command string, in args, out to the monitor and display the |
| 1161 | reply message. */ |
| 1162 | |
| 1163 | static void |
| 1164 | sds_command (args, from_tty) |
| 1165 | char *args; |
| 1166 | int from_tty; |
| 1167 | { |
| 1168 | char *p; |
| 1169 | int i, len, retlen; |
| 1170 | unsigned char buf[1000]; |
| 1171 | |
| 1172 | /* Convert hexadecimal chars into a byte buffer. */ |
| 1173 | p = args; |
| 1174 | len = 0; |
| 1175 | while (*p != '\0') |
| 1176 | { |
| 1177 | buf[len++] = fromhex (p[0]) * 16 + fromhex (p[1]); |
| 1178 | if (p[1] == '\0') |
| 1179 | break; |
| 1180 | p += 2; |
| 1181 | } |
| 1182 | |
| 1183 | retlen = sds_send (buf, len); |
| 1184 | |
| 1185 | printf_filtered ("Reply is "); |
| 1186 | for (i = 0; i < retlen; ++i) |
| 1187 | { |
| 1188 | printf_filtered ("%02x", buf[i]); |
| 1189 | } |
| 1190 | printf_filtered ("\n"); |
| 1191 | } |
| 1192 | |
| 1193 | void |
| 1194 | _initialize_remote_sds () |
| 1195 | { |
| 1196 | init_sds_ops (); |
| 1197 | add_target (&sds_ops); |
| 1198 | |
| 1199 | add_show_from_set (add_set_cmd ("sdstimeout", no_class, |
| 1200 | var_integer, (char *)&sds_timeout, |
| 1201 | "Set timeout value for sds read.\n", &setlist), |
| 1202 | &showlist); |
| 1203 | |
| 1204 | add_com ("sds", class_obscure, sds_command, |
| 1205 | "Send a command to the SDS monitor."); |
| 1206 | } |