| 1 | /* Remote target communications for serial-line targets in custom GDB protocol |
| 2 | Copyright 1988, 1991, 1992, 1993, 1994 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ |
| 19 | |
| 20 | #include "defs.h" |
| 21 | #include <string.h> |
| 22 | #include <fcntl.h> |
| 23 | #include "frame.h" |
| 24 | #include "inferior.h" |
| 25 | #include "bfd.h" |
| 26 | #include "symfile.h" |
| 27 | #include "target.h" |
| 28 | #include "wait.h" |
| 29 | #include "terminal.h" |
| 30 | #include "gdbcmd.h" |
| 31 | #include "objfiles.h" |
| 32 | #include "gdb-stabs.h" |
| 33 | |
| 34 | #include "dcache.h" |
| 35 | |
| 36 | #ifdef USG |
| 37 | #include <sys/types.h> |
| 38 | #endif |
| 39 | |
| 40 | #include <signal.h> |
| 41 | #include "serial.h" |
| 42 | |
| 43 | /* Prototypes for local functions */ |
| 44 | |
| 45 | static int |
| 46 | arc_write_bytes PARAMS ((CORE_ADDR memaddr, unsigned char *myaddr, int len)); |
| 47 | |
| 48 | static int |
| 49 | arc_read_bytes PARAMS ((CORE_ADDR memaddr, unsigned char *myaddr, int len)); |
| 50 | |
| 51 | static void |
| 52 | arc_files_info PARAMS ((struct target_ops *ignore)); |
| 53 | |
| 54 | static int |
| 55 | arc_xfer_memory PARAMS ((CORE_ADDR memaddr, char *myaddr, int len, |
| 56 | int should_write, struct target_ops *target)); |
| 57 | |
| 58 | static void |
| 59 | arc_xfer_cntlreg PARAMS ((int rw, unsigned char *data)); |
| 60 | |
| 61 | static void |
| 62 | arc_prepare_to_store PARAMS ((void)); |
| 63 | |
| 64 | static void |
| 65 | arc_fetch_registers PARAMS ((int regno)); |
| 66 | |
| 67 | static void |
| 68 | arc_resume PARAMS ((int pid, int step, enum target_signal siggnal)); |
| 69 | |
| 70 | static int |
| 71 | arc_start_remote PARAMS ((char *dummy)); |
| 72 | |
| 73 | static void |
| 74 | arc_open PARAMS ((char *name, int from_tty)); |
| 75 | |
| 76 | static void |
| 77 | arc_close PARAMS ((int quitting)); |
| 78 | |
| 79 | static void |
| 80 | arc_store_registers PARAMS ((int regno)); |
| 81 | |
| 82 | static void |
| 83 | getpkt PARAMS ((char *buf, int len)); |
| 84 | |
| 85 | static int |
| 86 | putpkt PARAMS ((char *buf, int len)); |
| 87 | |
| 88 | static int arc_wait PARAMS ((int pid, struct target_waitstatus *status)); |
| 89 | |
| 90 | static void |
| 91 | arc_detach PARAMS ((char *args, int from_tty)); |
| 92 | |
| 93 | static void |
| 94 | arc_interrupt PARAMS ((int signo)); |
| 95 | |
| 96 | static void |
| 97 | arc_interrupt_twice PARAMS ((int signo)); |
| 98 | |
| 99 | static void |
| 100 | interrupt_query PARAMS ((void)); |
| 101 | |
| 102 | extern struct target_ops arc_ops; /* Forward decl */ |
| 103 | |
| 104 | static int aux_reg_map[3][31] = AUX_REG_MAP; |
| 105 | |
| 106 | /* This was 5 seconds, which is a long time to sit and wait. |
| 107 | Unless this is going though some terminal server or multiplexer or |
| 108 | other form of hairy serial connection, I would think 2 seconds would |
| 109 | be plenty. */ |
| 110 | static int remote_timeout = 2; |
| 111 | |
| 112 | #if 0 |
| 113 | int icache; |
| 114 | #endif |
| 115 | |
| 116 | /* Descriptor for I/O to remote machine. Initialize it to NULL so that |
| 117 | arc_open knows that we don't have a file open when the program |
| 118 | starts. */ |
| 119 | static serial_t arc_desc = NULL; |
| 120 | |
| 121 | #define AUDIO_PROCESSOR 0 |
| 122 | #define GRAPHIC_PROCESSOR 1 |
| 123 | #define HOST_PROCESSOR 2 |
| 124 | static unsigned char cntl_reg_halt_bit[3] = { 0x08, 0x10, 0x20 }; |
| 125 | static unsigned char cntl_reg_step_bit[3] = { 0x01, 0x02, 0x04 }; |
| 126 | |
| 127 | static int curr_processor = HOST_PROCESSOR; |
| 128 | static unsigned char cntl_reg = 0; |
| 129 | static unsigned int status_reg = 0; |
| 130 | |
| 131 | #define PBUFSIZ 32 |
| 132 | #define MAXBUFBYTES 32 |
| 133 | |
| 134 | \f |
| 135 | /* Clean up connection to a remote debugger. */ |
| 136 | |
| 137 | /* ARGSUSED */ |
| 138 | static void |
| 139 | arc_close (quitting) |
| 140 | int quitting; |
| 141 | { |
| 142 | if (arc_desc) |
| 143 | SERIAL_CLOSE (arc_desc); |
| 144 | arc_desc = NULL; |
| 145 | } |
| 146 | |
| 147 | static int |
| 148 | arc_start_remote (dummy) |
| 149 | char *dummy; |
| 150 | { |
| 151 | immediate_quit = 1; /* Allow user to interrupt it */ |
| 152 | arc_xfer_cntlreg (1, &cntl_reg); |
| 153 | immediate_quit = 0; |
| 154 | |
| 155 | start_remote (); /* Initialize gdb process mechanisms */ |
| 156 | return 1; |
| 157 | } |
| 158 | |
| 159 | /* Open a connection to a remote debugger. |
| 160 | NAME is the filename used for communication. */ |
| 161 | |
| 162 | static DCACHE *remote_dcache; |
| 163 | |
| 164 | static void |
| 165 | arc_open (name, from_tty) |
| 166 | char *name; |
| 167 | int from_tty; |
| 168 | { |
| 169 | if (name == 0) |
| 170 | error ( |
| 171 | "To open a arc debug connection, you need to specify what parallel\n\ |
| 172 | device is attached to the remote system."); |
| 173 | |
| 174 | target_preopen (from_tty); |
| 175 | |
| 176 | unpush_target (&arc_ops); |
| 177 | |
| 178 | remote_dcache = dcache_init (arc_read_bytes, arc_write_bytes); |
| 179 | |
| 180 | arc_desc = SERIAL_OPEN (name); |
| 181 | if (!arc_desc) |
| 182 | perror_with_name (name); |
| 183 | |
| 184 | /* If there is something sitting in the buffer we might take it as a |
| 185 | response to a command, which would be bad. */ |
| 186 | SERIAL_FLUSH_INPUT (arc_desc); |
| 187 | |
| 188 | if (from_tty) |
| 189 | { |
| 190 | puts_filtered ("Remote debugging using "); |
| 191 | puts_filtered (name); |
| 192 | puts_filtered ("\n"); |
| 193 | } |
| 194 | push_target (&arc_ops); /* Switch to using remote target now */ |
| 195 | |
| 196 | /* Without this, some commands which require an active target (such as kill) |
| 197 | won't work. This variable serves (at least) double duty as both the pid |
| 198 | of the target process (if it has such), and as a flag indicating that a |
| 199 | target is active. These functions should be split out into seperate |
| 200 | variables, especially since GDB will someday have a notion of debugging |
| 201 | several processes. */ |
| 202 | |
| 203 | inferior_pid = 42000; |
| 204 | |
| 205 | /* Start the remote connection; if error (0), discard this target. |
| 206 | In particular, if the user quits, be sure to discard it |
| 207 | (we'd be in an inconsistent state otherwise). */ |
| 208 | if (!catch_errors (arc_start_remote, (char *)0, |
| 209 | "Couldn't establish connection to remote target\n", RETURN_MASK_ALL)) |
| 210 | pop_target(); |
| 211 | } |
| 212 | |
| 213 | /* arc_detach() |
| 214 | takes a program previously attached to and detaches it. |
| 215 | We better not have left any breakpoints |
| 216 | in the program or it'll die when it hits one. |
| 217 | Close the open connection to the remote debugger. |
| 218 | Use this when you want to detach and do something else |
| 219 | with your gdb. */ |
| 220 | |
| 221 | static void |
| 222 | arc_detach (args, from_tty) |
| 223 | char *args; |
| 224 | int from_tty; |
| 225 | { |
| 226 | if (args) |
| 227 | error ("Argument given to \"detach\" when remotely debugging."); |
| 228 | |
| 229 | pop_target (); |
| 230 | if (from_tty) |
| 231 | puts_filtered ("Ending remote debugging.\n"); |
| 232 | } |
| 233 | |
| 234 | /* arc_set_addrreg |
| 235 | set addr reg from debug system. */ |
| 236 | |
| 237 | static void |
| 238 | arc_set_addrreg (addr) |
| 239 | unsigned int addr; |
| 240 | { |
| 241 | unsigned char buf[6] = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0}; |
| 242 | |
| 243 | buf[0] = 0x0; |
| 244 | buf[4] = addr & 0xff; |
| 245 | buf[3] = (addr >> 8) & 0xff; |
| 246 | buf[2] = (addr >> 16) & 0xff; |
| 247 | buf[1] = (addr >> 24) & 0xff; |
| 248 | |
| 249 | putpkt (buf, 5); |
| 250 | } |
| 251 | |
| 252 | /* arc_xfer_datareg |
| 253 | read or write data reg from debug system. */ |
| 254 | |
| 255 | static void |
| 256 | arc_xfer_datareg (rw, aux, incr, data) |
| 257 | int rw; |
| 258 | int aux; |
| 259 | int incr; |
| 260 | unsigned int *data; |
| 261 | { |
| 262 | unsigned char buf1[6] = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0}; |
| 263 | unsigned char buf2[5]; |
| 264 | unsigned int tmp; |
| 265 | |
| 266 | /* read or write data */ |
| 267 | buf1[0] = (aux ? 0x81 : 0x41); |
| 268 | if (incr) |
| 269 | buf1[0] += 0x20; |
| 270 | if (rw) /* read */ |
| 271 | { |
| 272 | buf1[0] += 0x10; |
| 273 | putpkt (buf1, 1); |
| 274 | getpkt (buf2, 4); |
| 275 | *data = *(int *)buf2; |
| 276 | } |
| 277 | else |
| 278 | { |
| 279 | tmp = *data; |
| 280 | buf1[4] = tmp & 0xff; |
| 281 | buf1[3] = (tmp >> 8) & 0xff; |
| 282 | buf1[2] = (tmp >> 16) & 0xff; |
| 283 | buf1[1] = (tmp >> 24) & 0xff; |
| 284 | putpkt (buf1, 5); |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | /* arc_xfer_cntlreg |
| 289 | read or write control reg from debug system. */ |
| 290 | |
| 291 | static void |
| 292 | arc_xfer_cntlreg (rw, data) |
| 293 | int rw; |
| 294 | unsigned char *data; |
| 295 | { |
| 296 | unsigned char buf[3] = {0x0, 0x0, 0x0}; |
| 297 | |
| 298 | if (rw) |
| 299 | { |
| 300 | buf[0] = 0x12; |
| 301 | putpkt (buf, 1); |
| 302 | getpkt (data, 1); |
| 303 | } |
| 304 | else |
| 305 | { |
| 306 | buf[0] = 0x02; |
| 307 | buf[1] = *data; |
| 308 | putpkt (buf, 2); |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | /* arc_xfer_reg |
| 313 | read or write a reg to arc processors. */ |
| 314 | |
| 315 | static void |
| 316 | arc_xfer_reg (processor, rw, aux, regnum, data) |
| 317 | int processor; |
| 318 | int rw; |
| 319 | int aux; |
| 320 | int regnum; |
| 321 | unsigned int *data; |
| 322 | { |
| 323 | unsigned int tmp; |
| 324 | |
| 325 | if (processor == HOST_PROCESSOR) |
| 326 | { |
| 327 | /* write addr (regnum) */ |
| 328 | arc_set_addrreg (regnum); |
| 329 | arc_xfer_datareg (rw, aux, 0, data); |
| 330 | } |
| 331 | else |
| 332 | { |
| 333 | /* write addr register (aux r14) */ |
| 334 | arc_set_addrreg (0xe); |
| 335 | tmp = aux ? (regnum | 0x80000000) : regnum; |
| 336 | arc_xfer_datareg (0, 1, 0, tmp); |
| 337 | |
| 338 | /* read/write from data reg (aux reg 15/16) */ |
| 339 | arc_set_addrreg (processor == AUDIO_PROCESSOR ? 0x10 : 0xf); |
| 340 | arc_xfer_datareg (rw, 1, 0, data); |
| 341 | } |
| 342 | } |
| 343 | |
| 344 | \f |
| 345 | /* Tell the remote machine to resume. */ |
| 346 | |
| 347 | static enum target_signal last_sent_signal = TARGET_SIGNAL_0; |
| 348 | int last_sent_step; |
| 349 | |
| 350 | static void |
| 351 | arc_resume (pid, step, siggnal) |
| 352 | int pid, step; |
| 353 | enum target_signal siggnal; |
| 354 | { |
| 355 | unsigned int tmp; |
| 356 | |
| 357 | dcache_flush (remote_dcache); |
| 358 | |
| 359 | last_sent_signal = siggnal; |
| 360 | last_sent_step = step; |
| 361 | |
| 362 | /* don't know how to handle signal in ARC *** |
| 363 | if (siggnal != TARGET_SIGNAL_0) |
| 364 | { |
| 365 | buf[0] = step ? 'S' : 'C'; |
| 366 | buf[1] = tohex (((int)siggnal >> 4) & 0xf); |
| 367 | buf[2] = tohex ((int)siggnal & 0xf); |
| 368 | buf[3] = '\0'; |
| 369 | } |
| 370 | */ |
| 371 | |
| 372 | if (step) |
| 373 | { |
| 374 | /* write the step bit in control reg of debug system */ |
| 375 | unsigned char tmp_char = cntl_reg | cntl_reg_step_bit[curr_processor]; |
| 376 | arc_xfer_cntlreg (0, &tmp_char); |
| 377 | } |
| 378 | else |
| 379 | { |
| 380 | /* clear the halt bit in the status register */ |
| 381 | tmp = status_reg | 0x02000000; |
| 382 | arc_xfer_reg (curr_processor, 0, 1, 0, &tmp); |
| 383 | } |
| 384 | } |
| 385 | |
| 386 | \f |
| 387 | static void (*ofunc)(); |
| 388 | |
| 389 | /* Send to target to halt it. */ |
| 390 | static void |
| 391 | arc_interrupt (signo) |
| 392 | int signo; |
| 393 | { |
| 394 | unsigned char buf[3] = {0x02, 0x0, 0x0}; |
| 395 | /* If this doesn't work, try more severe steps. */ |
| 396 | signal (signo, arc_interrupt_twice); |
| 397 | |
| 398 | if (remote_debug) |
| 399 | printf_unfiltered ("arc_interrupt called\n"); |
| 400 | |
| 401 | if (cntl_reg & cntl_reg_halt_bit[curr_processor]) |
| 402 | return; |
| 403 | |
| 404 | buf[1] = cntl_reg | cntl_reg_halt_bit[curr_processor]; |
| 405 | putpkt (buf, 2); |
| 406 | return; |
| 407 | } |
| 408 | |
| 409 | /* The user typed ^C twice. */ |
| 410 | static void |
| 411 | arc_interrupt_twice (signo) |
| 412 | int signo; |
| 413 | { |
| 414 | signal (signo, ofunc); |
| 415 | |
| 416 | interrupt_query (); |
| 417 | |
| 418 | signal (signo, arc_interrupt); |
| 419 | } |
| 420 | |
| 421 | /* Ask the user what to do when an interrupt is received. */ |
| 422 | |
| 423 | static void |
| 424 | interrupt_query () |
| 425 | { |
| 426 | target_terminal_ours (); |
| 427 | |
| 428 | if (query ("Interrupted while waiting for the program.\n\ |
| 429 | Give up (and stop debugging it)? ")) |
| 430 | { |
| 431 | target_mourn_inferior (); |
| 432 | return_to_top_level (RETURN_QUIT); |
| 433 | } |
| 434 | |
| 435 | target_terminal_inferior (); |
| 436 | } |
| 437 | |
| 438 | /* If nonzero, ignore the next kill. */ |
| 439 | int kill_kludge; |
| 440 | |
| 441 | /* Wait until the remote machine stops, then return, |
| 442 | storing status in STATUS just as `wait' would. |
| 443 | Returns "pid" (though it's not clear what, if anything, that |
| 444 | means in the case of this target). */ |
| 445 | |
| 446 | static int |
| 447 | arc_wait (pid, status) |
| 448 | int pid; |
| 449 | struct target_waitstatus *status; |
| 450 | { |
| 451 | unsigned char buf[PBUFSIZ]; |
| 452 | int thread_num = -1; |
| 453 | unsigned char cmd; |
| 454 | int proc; |
| 455 | |
| 456 | status->kind = TARGET_WAITKIND_EXITED; |
| 457 | status->value.integer = 0; |
| 458 | |
| 459 | while (1) |
| 460 | { |
| 461 | unsigned char *p; |
| 462 | |
| 463 | ofunc = (void (*)()) signal (SIGINT, arc_interrupt); |
| 464 | arc_xfer_cntlreg (1, &cntl_reg); |
| 465 | signal (SIGINT, ofunc); |
| 466 | if (cntl_reg & cntl_reg_halt_bit[curr_processor]) |
| 467 | break; |
| 468 | status->kind = TARGET_WAITKIND_STOPPED; |
| 469 | } |
| 470 | |
| 471 | if ((curr_processor != HOST_PROCESSOR) && |
| 472 | !(cntl_reg & cntl_reg_halt_bit[HOST_PROCESSOR])) |
| 473 | { |
| 474 | cmd = cntl_reg | cntl_reg_halt_bit[HOST_PROCESSOR]; |
| 475 | arc_xfer_cntlreg (0, &cmd); |
| 476 | while (1) |
| 477 | { |
| 478 | unsigned char *p; |
| 479 | |
| 480 | ofunc = (void (*)()) signal (SIGINT, arc_interrupt); |
| 481 | arc_xfer_cntlreg (1, &cntl_reg); |
| 482 | signal (SIGINT, ofunc); |
| 483 | if (cntl_reg & cntl_reg_halt_bit[HOST_PROCESSOR]) |
| 484 | break; |
| 485 | } |
| 486 | } |
| 487 | |
| 488 | for (proc = AUDIO_PROCESSOR ; proc <= GRAPHIC_PROCESSOR; proc++) |
| 489 | { |
| 490 | if ((cntl_reg & cntl_reg_halt_bit[proc])) |
| 491 | continue; |
| 492 | cmd = cntl_reg | cntl_reg_halt_bit[proc]; |
| 493 | arc_xfer_cntlreg (0, &cmd); |
| 494 | } |
| 495 | |
| 496 | arc_xfer_reg (curr_processor, 1, 1, 0, &status_reg); |
| 497 | return inferior_pid; |
| 498 | } |
| 499 | |
| 500 | /* Number of bytes of registers this implements. */ |
| 501 | static int register_bytes_found; |
| 502 | |
| 503 | /* Read the remote registers into the block REGS. */ |
| 504 | /* Currently we just read all the registers, so we don't use regno. */ |
| 505 | |
| 506 | static void |
| 507 | arc_fetch_registers (regno) |
| 508 | int regno; |
| 509 | { |
| 510 | int i; |
| 511 | char regs[REGISTER_BYTES]; |
| 512 | |
| 513 | /* Unimplemented registers read as all bits zero. */ |
| 514 | memset (regs, 0, REGISTER_BYTES); |
| 515 | |
| 516 | /* get core register */ |
| 517 | arc_set_addrreg (0); |
| 518 | for (i = 0; i < AUX_BEG_REGNUM; i++) |
| 519 | { |
| 520 | if (curr_processor == HOST_PROCESSOR) |
| 521 | arc_xfer_datareg (1, 0, 1, ®s[REGISTER_BYTE(i)]); |
| 522 | else |
| 523 | arc_xfer_reg (curr_processor, 1, 0, regno, ®s[REGISTER_BYTE(i)]); |
| 524 | } |
| 525 | |
| 526 | /* get aux register */ |
| 527 | for (i = AUX_BEG_REGNUM; i < AUX_END_REGNUM; i++) |
| 528 | { |
| 529 | int auxregnum = aux_reg_map[curr_processor][i-AUX_BEG_REGNUM+1]; |
| 530 | if (auxregnum == -1) |
| 531 | continue; |
| 532 | arc_xfer_reg (curr_processor, 1, 1, auxregnum, ®s[REGISTER_BYTE(i)]); |
| 533 | } |
| 534 | /* copy from status register to pc */ |
| 535 | for (i = 1; i <= 3; i++) |
| 536 | registers[REGISTER_BYTE (PC_REGNUM)+i] = |
| 537 | registers[REGISTER_BYTE (STA_REGNUM)+i]; |
| 538 | |
| 539 | /* |
| 540 | if (i != register_bytes_found) |
| 541 | { |
| 542 | register_bytes_found = i; |
| 543 | if (!REGISTER_BYTES_OK (i)) |
| 544 | warning ("Remote reply is too short: %s", buf); |
| 545 | } |
| 546 | */ |
| 547 | |
| 548 | for (i = 0; i < NUM_REGS; i++) |
| 549 | supply_register (i, ®s[REGISTER_BYTE(i)]); |
| 550 | } |
| 551 | |
| 552 | /* Prepare to store registers. Since we may send them all, |
| 553 | we have to read out the ones we don't want to change first. */ |
| 554 | |
| 555 | static void |
| 556 | arc_prepare_to_store () |
| 557 | { |
| 558 | /* Make sure the entire registers array is valid. */ |
| 559 | read_register_bytes (0, (char *)NULL, REGISTER_BYTES); |
| 560 | } |
| 561 | |
| 562 | /* Store register REGNO, or all registers if REGNO == -1, from the contents |
| 563 | of REGISTERS. FIXME: ignores errors. */ |
| 564 | |
| 565 | static void |
| 566 | arc_store_registers (regno) |
| 567 | int regno; |
| 568 | { |
| 569 | int i; |
| 570 | char *regp; |
| 571 | |
| 572 | /* Try storing a single register. */ |
| 573 | if (regno >= 0) |
| 574 | { |
| 575 | int isaux = (regno >= AUX_BEG_REGNUM ? 1 : 0); |
| 576 | |
| 577 | regp = ®isters[REGISTER_BYTE (regno)]; |
| 578 | arc_xfer_reg (curr_processor, 0, isaux, regno, regp); |
| 579 | } |
| 580 | |
| 581 | /* store core regs */ |
| 582 | arc_set_addrreg (0); |
| 583 | for (i = 0; i < AUX_BEG_REGNUM; i++) |
| 584 | { |
| 585 | regp = ®isters[REGISTER_BYTE (i)]; |
| 586 | if (curr_processor == HOST_PROCESSOR) |
| 587 | arc_xfer_datareg (0, 0, 1, regp); |
| 588 | else |
| 589 | arc_xfer_reg (curr_processor, 0, 0, regno, regp); |
| 590 | } |
| 591 | |
| 592 | /* store aux regs */ |
| 593 | /* copy pc back to status register */ |
| 594 | for (i = 1; i <= 3; i++) |
| 595 | registers[REGISTER_BYTE (STA_REGNUM)+i] = |
| 596 | registers[REGISTER_BYTE (PC_REGNUM)+i]; |
| 597 | for (i = AUX_BEG_REGNUM; i <= AUX_END_REGNUM; i++) |
| 598 | { |
| 599 | int auxregnum = aux_reg_map[curr_processor][i-AUX_BEG_REGNUM+1]; |
| 600 | if (auxregnum == -1) |
| 601 | continue; |
| 602 | regp = ®isters[REGISTER_BYTE (i)]; |
| 603 | arc_xfer_reg (curr_processor, 0, 1, auxregnum, regp); |
| 604 | } |
| 605 | |
| 606 | } |
| 607 | |
| 608 | #if 0 |
| 609 | /* Use of the data cache is disabled because it loses for looking at |
| 610 | and changing hardware I/O ports and the like. Accepting `voltile' |
| 611 | would perhaps be one way to fix it, but a better way which would |
| 612 | win for more cases would be to use the executable file for the text |
| 613 | segment, like the `icache' code below but done cleanly (in some |
| 614 | target-independent place, perhaps in target_xfer_memory, perhaps |
| 615 | based on assigning each target a speed or perhaps by some simpler |
| 616 | mechanism). */ |
| 617 | |
| 618 | /* Read a word from remote address ADDR and return it. |
| 619 | This goes through the data cache. */ |
| 620 | |
| 621 | static int |
| 622 | arc_fetch_word (addr) |
| 623 | CORE_ADDR addr; |
| 624 | { |
| 625 | #if 0 |
| 626 | if (icache) |
| 627 | { |
| 628 | extern CORE_ADDR text_start, text_end; |
| 629 | |
| 630 | if (addr >= text_start && addr < text_end) |
| 631 | { |
| 632 | int buffer; |
| 633 | xfer_core_file (addr, &buffer, sizeof (int)); |
| 634 | return buffer; |
| 635 | } |
| 636 | } |
| 637 | #endif |
| 638 | return dcache_fetch (remote_dcache, addr); |
| 639 | } |
| 640 | |
| 641 | /* Write a word WORD into remote address ADDR. |
| 642 | This goes through the data cache. */ |
| 643 | |
| 644 | static void |
| 645 | arc_store_word (addr, word) |
| 646 | CORE_ADDR addr; |
| 647 | int word; |
| 648 | { |
| 649 | dcache_poke (remote_dcache, addr, word); |
| 650 | } |
| 651 | #endif /* 0 */ |
| 652 | |
| 653 | \f |
| 654 | /* Write memory data directly to the remote machine. |
| 655 | This does not inform the data cache; the data cache uses this. |
| 656 | MEMADDR is the address in the remote memory space. |
| 657 | MYADDR is the address of the buffer in our space. |
| 658 | LEN is the number of bytes. |
| 659 | |
| 660 | Returns number of bytes transferred, or 0 for error. */ |
| 661 | |
| 662 | static int |
| 663 | arc_write_bytes (memaddr, myaddr, len) |
| 664 | CORE_ADDR memaddr; |
| 665 | unsigned char *myaddr; |
| 666 | int len; |
| 667 | { |
| 668 | char buf1[6] = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0}; |
| 669 | char buf2[6] = {0x21, 0x0, 0x0, 0x0, 0x0, 0x0}; |
| 670 | int i; |
| 671 | char *p; |
| 672 | |
| 673 | /* We send target system values byte by byte, in increasing byte addresses*/ |
| 674 | |
| 675 | buf1[4] = memaddr & 0xff; |
| 676 | buf1[3] = (memaddr >> 8) & 0xff; |
| 677 | buf1[2] = (memaddr >> 16) & 0xff; |
| 678 | buf1[1] = (memaddr >> 24) & 0xff; |
| 679 | putpkt (buf1, 5); |
| 680 | |
| 681 | for (i = 0; i < len; ) |
| 682 | { |
| 683 | buf2[1] = myaddr[i++]; |
| 684 | buf2[2] = myaddr[i++]; |
| 685 | buf2[3] = myaddr[i++]; |
| 686 | buf2[4] = myaddr[i++]; |
| 687 | putpkt (buf2, 5); |
| 688 | } |
| 689 | |
| 690 | return len; |
| 691 | } |
| 692 | |
| 693 | /* Read memory data directly from the remote machine. |
| 694 | This does not use the data cache; the data cache uses this. |
| 695 | MEMADDR is the address in the remote memory space. |
| 696 | MYADDR is the address of the buffer in our space. |
| 697 | LEN is the number of bytes. |
| 698 | |
| 699 | Returns number of bytes transferred, or 0 for error. */ |
| 700 | |
| 701 | static int |
| 702 | arc_read_bytes (memaddr, myaddr, len) |
| 703 | CORE_ADDR memaddr; |
| 704 | unsigned char *myaddr; |
| 705 | int len; |
| 706 | { |
| 707 | unsigned char buf1[6] = {0x0, 0x0, 0x0, 0x0, 0x0, 0x0}; |
| 708 | unsigned char buf2[3] = {0x31, 0x0, 0x0}; |
| 709 | unsigned char buf3[5]; |
| 710 | int i; |
| 711 | char *p; |
| 712 | |
| 713 | /* We send target system values byte by byte, in increasing byte addresses*/ |
| 714 | |
| 715 | buf1[4] = memaddr & 0xff; |
| 716 | buf1[3] = (memaddr >> 8) & 0xff; |
| 717 | buf1[2] = (memaddr >> 16) & 0xff; |
| 718 | buf1[1] = (memaddr >> 24) & 0xff; |
| 719 | putpkt (buf1, 5); |
| 720 | |
| 721 | for (i = 0; i < len; ) |
| 722 | { |
| 723 | putpkt (buf2, 2); |
| 724 | getpkt (buf3, 4); |
| 725 | myaddr[i++] = buf3[1]; |
| 726 | myaddr[i++] = buf3[2]; |
| 727 | myaddr[i++] = buf3[3]; |
| 728 | myaddr[i++] = buf3[4]; |
| 729 | } |
| 730 | |
| 731 | return i; |
| 732 | } |
| 733 | |
| 734 | \f |
| 735 | /* Read or write LEN bytes from inferior memory at MEMADDR, transferring |
| 736 | to or from debugger address MYADDR. Write to inferior if SHOULD_WRITE is |
| 737 | nonzero. Returns length of data written or read; 0 for error. */ |
| 738 | |
| 739 | /* ARGSUSED */ |
| 740 | static int |
| 741 | arc_xfer_memory(memaddr, myaddr, len, should_write, target) |
| 742 | CORE_ADDR memaddr; |
| 743 | char *myaddr; |
| 744 | int len; |
| 745 | int should_write; |
| 746 | struct target_ops *target; /* ignored */ |
| 747 | { |
| 748 | int xfersize; |
| 749 | int bytes_xferred; |
| 750 | int total_xferred = 0; |
| 751 | |
| 752 | while (len > 0) |
| 753 | { |
| 754 | if (len > MAXBUFBYTES) |
| 755 | xfersize = MAXBUFBYTES; |
| 756 | else |
| 757 | xfersize = len; |
| 758 | |
| 759 | if (should_write) |
| 760 | bytes_xferred = arc_write_bytes (memaddr, |
| 761 | (unsigned char *)myaddr, xfersize); |
| 762 | else |
| 763 | bytes_xferred = arc_read_bytes (memaddr, |
| 764 | (unsigned char *)myaddr, xfersize); |
| 765 | |
| 766 | /* If we get an error, we are done xferring. */ |
| 767 | if (bytes_xferred == 0) |
| 768 | break; |
| 769 | |
| 770 | memaddr += bytes_xferred; |
| 771 | myaddr += bytes_xferred; |
| 772 | len -= bytes_xferred; |
| 773 | total_xferred += bytes_xferred; |
| 774 | } |
| 775 | return total_xferred; |
| 776 | } |
| 777 | |
| 778 | \f |
| 779 | static void |
| 780 | arc_files_info (ignore) |
| 781 | struct target_ops *ignore; |
| 782 | { |
| 783 | puts_filtered ("Debugging a target over a serial line.\n"); |
| 784 | } |
| 785 | \f |
| 786 | |
| 787 | /* Read a single character from the remote end, masking it down to 7 bits. */ |
| 788 | static int |
| 789 | readchar () |
| 790 | { |
| 791 | int ch; |
| 792 | |
| 793 | ch = SERIAL_READCHAR (arc_desc, 0); |
| 794 | |
| 795 | switch (ch) |
| 796 | { |
| 797 | case SERIAL_EOF: |
| 798 | error ("Remote connection closed"); |
| 799 | case SERIAL_ERROR: |
| 800 | perror_with_name ("Remote communication error"); |
| 801 | case SERIAL_TIMEOUT: |
| 802 | return ch; |
| 803 | default: |
| 804 | return ch & 0x7f; |
| 805 | } |
| 806 | } |
| 807 | |
| 808 | /* Send a packet to the remote machine, with error checking. |
| 809 | The data of the packet is in BUF. */ |
| 810 | |
| 811 | static int |
| 812 | putpkt (buf, len) |
| 813 | char *buf; |
| 814 | int len; |
| 815 | { |
| 816 | int i = 0; |
| 817 | unsigned char csum = 0; |
| 818 | |
| 819 | while (i < len) |
| 820 | { |
| 821 | if (remote_debug) |
| 822 | { |
| 823 | printf_unfiltered ("Sending packet: %s...", buf); |
| 824 | gdb_flush(gdb_stdout); |
| 825 | } |
| 826 | if (SERIAL_WRITE (arc_desc, buf, i)) |
| 827 | perror_with_name ("putpkt: write failed"); |
| 828 | i++; |
| 829 | |
| 830 | #if 0 |
| 831 | /* This is wrong. If doing a long backtrace, the user should be |
| 832 | able to get out next time we call QUIT, without anything as violent |
| 833 | as interrupt_query. If we want to provide a way out of here |
| 834 | without getting to the next QUIT, it should be based on hitting |
| 835 | ^C twice as in arc_wait. */ |
| 836 | if (quit_flag) |
| 837 | { |
| 838 | quit_flag = 0; |
| 839 | interrupt_query (); |
| 840 | } |
| 841 | #endif |
| 842 | } |
| 843 | } |
| 844 | |
| 845 | /* Read a packet from the remote machine, with error checking, |
| 846 | and store it in BUF. BUF is expected to be of size PBUFSIZ. |
| 847 | If FOREVER, wait forever rather than timing out; this is used |
| 848 | while the target is executing user code. */ |
| 849 | |
| 850 | static void |
| 851 | getpkt (buf, len) |
| 852 | char *buf; |
| 853 | int len; |
| 854 | { |
| 855 | int c; |
| 856 | int i; |
| 857 | |
| 858 | for (i = 0; i < len; i++) |
| 859 | { |
| 860 | c = readchar (); |
| 861 | if (c == SERIAL_ERROR) |
| 862 | { |
| 863 | if (remote_debug) |
| 864 | puts_filtered ("Read error.\n"); |
| 865 | } |
| 866 | } |
| 867 | buf[i] = '\0'; |
| 868 | |
| 869 | if (remote_debug) |
| 870 | fprintf_unfiltered (gdb_stderr, "Packet received: %s\n", buf); |
| 871 | if (i != len) |
| 872 | printf_unfiltered ("Ignoring packet error, continuing...\n"); |
| 873 | } |
| 874 | \f |
| 875 | static void |
| 876 | arc_kill () |
| 877 | { |
| 878 | /* For some mysterious reason, wait_for_inferior calls kill instead of |
| 879 | mourn after it gets TARGET_WAITKIND_SIGNALLED. Work around it. */ |
| 880 | if (kill_kludge) |
| 881 | { |
| 882 | kill_kludge = 0; |
| 883 | target_mourn_inferior (); |
| 884 | return; |
| 885 | } |
| 886 | target_mourn_inferior (); |
| 887 | } |
| 888 | |
| 889 | static void |
| 890 | arc_mourn () |
| 891 | { |
| 892 | unpush_target (&arc_ops); |
| 893 | generic_mourn_inferior (); |
| 894 | } |
| 895 | |
| 896 | \f |
| 897 | |
| 898 | static unsigned char big_break_insn[] = BIG_BREAKPOINT; |
| 899 | static unsigned char little_break_insn[] = LITTLE_BREAKPOINT; |
| 900 | #define BREAKPOINT_LEN (sizeof little_break_insn) |
| 901 | |
| 902 | /* Insert a breakpoint on targets that don't have any better breakpoint |
| 903 | support. We read the contents of the target location and stash it, |
| 904 | then overwrite it with a breakpoint instruction. ADDR is the target |
| 905 | location in the target machine. CONTENTS_CACHE is a pointer to |
| 906 | memory allocated for saving the target contents. It is guaranteed |
| 907 | by the caller to be long enough to save sizeof BREAKPOINT bytes (this |
| 908 | is accomplished via BREAKPOINT_MAX). */ |
| 909 | |
| 910 | static int |
| 911 | arc_insert_breakpoint (addr, contents_cache) |
| 912 | CORE_ADDR addr; |
| 913 | char *contents_cache; |
| 914 | { |
| 915 | int val; |
| 916 | |
| 917 | val = target_read_memory (addr, contents_cache, BREAKPOINT_LEN); |
| 918 | if (val == 0) |
| 919 | { |
| 920 | if (TARGET_BYTE_ORDER == BIG_ENDIAN) |
| 921 | val = target_write_memory (addr, (char *) big_break_insn, |
| 922 | BREAKPOINT_LEN); |
| 923 | else |
| 924 | val = target_write_memory (addr, (char *) little_break_insn, |
| 925 | BREAKPOINT_LEN); |
| 926 | } |
| 927 | return val; |
| 928 | } |
| 929 | |
| 930 | static int |
| 931 | arc_remove_breakpoint (addr, contents_cache) |
| 932 | CORE_ADDR addr; |
| 933 | char *contents_cache; |
| 934 | { |
| 935 | return target_write_memory (addr, contents_cache, BREAKPOINT_LEN); |
| 936 | } |
| 937 | |
| 938 | /* switch_command |
| 939 | support 'switch' command to switch among the three processors of ARC. */ |
| 940 | |
| 941 | static void |
| 942 | switch_command (args, fromtty) |
| 943 | char *args; |
| 944 | int fromtty; |
| 945 | { |
| 946 | struct target_waitstatus status; |
| 947 | int proc; |
| 948 | |
| 949 | if (strncmp (args, "audio", 3) == 0) |
| 950 | proc = 0; |
| 951 | else if (strncmp (args, "graphic", 3) == 0) |
| 952 | proc = 1; |
| 953 | else if (strncmp (args, "host", 4) == 0) |
| 954 | proc = 2; |
| 955 | |
| 956 | curr_processor = proc; |
| 957 | |
| 958 | switch (proc) |
| 959 | { |
| 960 | case 0: |
| 961 | tm_print_insn = arc_get_disassembler (bfd_mach_arc_audio, |
| 962 | TARGET_BYTE_ORDER == BIG_ENDIAN); |
| 963 | break; |
| 964 | case 1: |
| 965 | tm_print_insn = arc_get_disassembler (bfd_mach_arc_graphics, |
| 966 | TARGET_BYTE_ORDER == BIG_ENDIAN); |
| 967 | break; |
| 968 | case 2: |
| 969 | tm_print_insn = arc_get_disassembler (bfd_mach_arc_host, |
| 970 | TARGET_BYTE_ORDER == BIG_ENDIAN); |
| 971 | break; |
| 972 | } |
| 973 | |
| 974 | return; |
| 975 | } |
| 976 | |
| 977 | \f |
| 978 | /* Define the target subroutine names */ |
| 979 | |
| 980 | struct target_ops arc_ops = { |
| 981 | "arc", /* to_shortname */ |
| 982 | "Remote target in arc-specific protocol", /* to_longname */ |
| 983 | "Use a remote computer via a parallel line, using a arc-specific protocol.\n\ |
| 984 | Specify the device it is connected to.", /* to_doc */ |
| 985 | arc_open, /* to_open */ |
| 986 | arc_close, /* to_close */ |
| 987 | NULL, /* to_attach */ |
| 988 | arc_detach, /* to_detach */ |
| 989 | arc_resume, /* to_resume */ |
| 990 | arc_wait, /* to_wait */ |
| 991 | arc_fetch_registers, /* to_fetch_registers */ |
| 992 | arc_store_registers, /* to_store_registers */ |
| 993 | arc_prepare_to_store, /* to_prepare_to_store */ |
| 994 | arc_xfer_memory, /* to_xfer_memory */ |
| 995 | arc_files_info, /* to_files_info */ |
| 996 | |
| 997 | arc_insert_breakpoint, /* to_insert_breakpoint */ |
| 998 | arc_remove_breakpoint, /* to_remove_breakpoint */ |
| 999 | |
| 1000 | NULL, /* to_terminal_init */ |
| 1001 | NULL, /* to_terminal_inferior */ |
| 1002 | NULL, /* to_terminal_ours_for_output */ |
| 1003 | NULL, /* to_terminal_ours */ |
| 1004 | NULL, /* to_terminal_info */ |
| 1005 | arc_kill, /* to_kill */ |
| 1006 | generic_load, /* to_load */ |
| 1007 | NULL, /* to_lookup_symbol */ |
| 1008 | NULL, /* to_create_inferior */ |
| 1009 | arc_mourn, /* to_mourn_inferior */ |
| 1010 | 0, /* to_can_run */ |
| 1011 | 0, /* to_notice_signals */ |
| 1012 | 0, /* to_thread_alive */ |
| 1013 | 0, /* to_stop */ |
| 1014 | process_stratum, /* to_stratum */ |
| 1015 | NULL, /* to_next */ |
| 1016 | 1, /* to_has_all_memory */ |
| 1017 | 1, /* to_has_memory */ |
| 1018 | 1, /* to_has_stack */ |
| 1019 | 1, /* to_has_registers */ |
| 1020 | 1, /* to_has_execution */ |
| 1021 | NULL, /* sections */ |
| 1022 | NULL, /* sections_end */ |
| 1023 | OPS_MAGIC /* to_magic */ |
| 1024 | }; |
| 1025 | |
| 1026 | void |
| 1027 | _initialize_remote_arc () |
| 1028 | { |
| 1029 | add_target (&arc_ops); |
| 1030 | } |