| 1 | /* Memory-access and commands for remote NINDY process, for GDB. |
| 2 | Copyright 1990, 1991, 1992 Free Software Foundation, Inc. |
| 3 | Contributed by Intel Corporation. Modified from remote.c by Chris Benenati. |
| 4 | |
| 5 | GDB is distributed in the hope that it will be useful, but WITHOUT ANY |
| 6 | WARRANTY. No author or distributor accepts responsibility to anyone |
| 7 | for the consequences of using it or for whether it serves any |
| 8 | particular purpose or works at all, unless he says so in writing. |
| 9 | Refer to the GDB General Public License for full details. |
| 10 | |
| 11 | Everyone is granted permission to copy, modify and redistribute GDB, |
| 12 | but only under the conditions described in the GDB General Public |
| 13 | License. A copy of this license is supposed to have been given to you |
| 14 | along with GDB so you can know your rights and responsibilities. It |
| 15 | should be in a file named COPYING. Among other things, the copyright |
| 16 | notice and this notice must be preserved on all copies. |
| 17 | |
| 18 | In other words, go ahead and share GDB, but don't try to stop |
| 19 | anyone else from sharing it farther. Help stamp out software hoarding! |
| 20 | */ |
| 21 | |
| 22 | /* |
| 23 | Except for the data cache routines, this file bears little resemblence |
| 24 | to remote.c. A new (although similar) protocol has been specified, and |
| 25 | portions of the code are entirely dependent on having an i80960 with a |
| 26 | NINDY ROM monitor at the other end of the line. |
| 27 | */ |
| 28 | |
| 29 | /***************************************************************************** |
| 30 | * |
| 31 | * REMOTE COMMUNICATION PROTOCOL BETWEEN GDB960 AND THE NINDY ROM MONITOR. |
| 32 | * |
| 33 | * |
| 34 | * MODES OF OPERATION |
| 35 | * ----- -- --------- |
| 36 | * |
| 37 | * As far as NINDY is concerned, GDB is always in one of two modes: command |
| 38 | * mode or passthrough mode. |
| 39 | * |
| 40 | * In command mode (the default) pre-defined packets containing requests |
| 41 | * are sent by GDB to NINDY. NINDY never talks except in reponse to a request. |
| 42 | * |
| 43 | * Once the the user program is started, GDB enters passthrough mode, to give |
| 44 | * the user program access to the terminal. GDB remains in this mode until |
| 45 | * NINDY indicates that the program has stopped. |
| 46 | * |
| 47 | * |
| 48 | * PASSTHROUGH MODE |
| 49 | * ----------- ---- |
| 50 | * |
| 51 | * GDB writes all input received from the keyboard directly to NINDY, and writes |
| 52 | * all characters received from NINDY directly to the monitor. |
| 53 | * |
| 54 | * Keyboard input is neither buffered nor echoed to the monitor. |
| 55 | * |
| 56 | * GDB remains in passthrough mode until NINDY sends a single ^P character, |
| 57 | * to indicate that the user process has stopped. |
| 58 | * |
| 59 | * Note: |
| 60 | * GDB assumes NINDY performs a 'flushreg' when the user program stops. |
| 61 | * |
| 62 | * |
| 63 | * COMMAND MODE |
| 64 | * ------- ---- |
| 65 | * |
| 66 | * All info (except for message ack and nak) is transferred between gdb |
| 67 | * and the remote processor in messages of the following format: |
| 68 | * |
| 69 | * <info>#<checksum> |
| 70 | * |
| 71 | * where |
| 72 | * # is a literal character |
| 73 | * |
| 74 | * <info> ASCII information; all numeric information is in the |
| 75 | * form of hex digits ('0'-'9' and lowercase 'a'-'f'). |
| 76 | * |
| 77 | * <checksum> |
| 78 | * is a pair of ASCII hex digits representing an 8-bit |
| 79 | * checksum formed by adding together each of the |
| 80 | * characters in <info>. |
| 81 | * |
| 82 | * The receiver of a message always sends a single character to the sender |
| 83 | * to indicate that the checksum was good ('+') or bad ('-'); the sender |
| 84 | * re-transmits the entire message over until a '+' is received. |
| 85 | * |
| 86 | * In response to a command NINDY always sends back either data or |
| 87 | * a result code of the form "Xnn", where "nn" are hex digits and "X00" |
| 88 | * means no errors. (Exceptions: the "s" and "c" commands don't respond.) |
| 89 | * |
| 90 | * SEE THE HEADER OF THE FILE "gdb.c" IN THE NINDY MONITOR SOURCE CODE FOR A |
| 91 | * FULL DESCRIPTION OF LEGAL COMMANDS. |
| 92 | * |
| 93 | * SEE THE FILE "stop.h" IN THE NINDY MONITOR SOURCE CODE FOR A LIST |
| 94 | * OF STOP CODES. |
| 95 | * |
| 96 | ******************************************************************************/ |
| 97 | |
| 98 | #include "defs.h" |
| 99 | #include <signal.h> |
| 100 | #include <sys/types.h> |
| 101 | #include <setjmp.h> |
| 102 | |
| 103 | #include "frame.h" |
| 104 | #include "inferior.h" |
| 105 | #include "target.h" |
| 106 | #include "gdbcore.h" |
| 107 | #include "command.h" |
| 108 | #include "bfd.h" |
| 109 | #include "ieee-float.h" |
| 110 | |
| 111 | #include "wait.h" |
| 112 | #include <sys/ioctl.h> |
| 113 | #include <sys/file.h> |
| 114 | #include <ctype.h> |
| 115 | #include "nindy-share/ttycntl.h" |
| 116 | #include "nindy-share/demux.h" |
| 117 | #include "nindy-share/env.h" |
| 118 | #include "nindy-share/stop.h" |
| 119 | |
| 120 | extern int unlink(); |
| 121 | extern char *getenv(); |
| 122 | extern char *mktemp(); |
| 123 | |
| 124 | extern char *coffstrip(); |
| 125 | extern void generic_mourn_inferior (); |
| 126 | |
| 127 | extern struct target_ops nindy_ops; |
| 128 | extern jmp_buf to_top_level; |
| 129 | extern FILE *instream; |
| 130 | extern struct ext_format ext_format_i960; /* i960-tdep.c */ |
| 131 | |
| 132 | extern char ninStopWhy (); |
| 133 | |
| 134 | int nindy_initial_brk; /* nonzero if want to send an initial BREAK to nindy */ |
| 135 | int nindy_old_protocol; /* nonzero if want to use old protocol */ |
| 136 | char *nindy_ttyname; /* name of tty to talk to nindy on, or null */ |
| 137 | |
| 138 | #define DLE '\020' /* Character NINDY sends to indicate user program has |
| 139 | * halted. */ |
| 140 | #define TRUE 1 |
| 141 | #define FALSE 0 |
| 142 | |
| 143 | int nindy_fd = 0; /* Descriptor for I/O to NINDY */ |
| 144 | static int have_regs = 0; /* 1 iff regs read since i960 last halted */ |
| 145 | static int regs_changed = 0; /* 1 iff regs were modified since last read */ |
| 146 | |
| 147 | extern char *exists(); |
| 148 | static void dcache_flush (), dcache_poke (), dcache_init(); |
| 149 | static int dcache_fetch (); |
| 150 | \f |
| 151 | /* FIXME, we can probably use the normal terminal_inferior stuff here. |
| 152 | We have to do terminal_inferior and then set up the passthrough |
| 153 | settings initially. Thereafter, terminal_ours and terminal_inferior |
| 154 | will automatically swap the settings around for us. */ |
| 155 | |
| 156 | /* Restore TTY to normal operation */ |
| 157 | |
| 158 | static TTY_STRUCT orig_tty; /* TTY attributes before entering passthrough */ |
| 159 | |
| 160 | static void |
| 161 | restore_tty() |
| 162 | { |
| 163 | ioctl( 0, TIOCSETN, &orig_tty ); |
| 164 | } |
| 165 | |
| 166 | |
| 167 | /* Recover from ^Z or ^C while remote process is running */ |
| 168 | |
| 169 | static void (*old_ctrlc)(); /* Signal handlers before entering passthrough */ |
| 170 | |
| 171 | #ifdef SIGTSTP |
| 172 | static void (*old_ctrlz)(); |
| 173 | #endif |
| 174 | |
| 175 | static |
| 176 | #ifdef USG |
| 177 | void |
| 178 | #endif |
| 179 | cleanup() |
| 180 | { |
| 181 | restore_tty(); |
| 182 | signal(SIGINT, old_ctrlc); |
| 183 | #ifdef SIGTSTP |
| 184 | signal(SIGTSTP, old_ctrlz); |
| 185 | #endif |
| 186 | error("\n\nYou may need to reset the 80960 and/or reload your program.\n"); |
| 187 | } |
| 188 | \f |
| 189 | /* Clean up anything that needs cleaning when losing control. */ |
| 190 | |
| 191 | static char *savename; |
| 192 | |
| 193 | static void |
| 194 | nindy_close (quitting) |
| 195 | int quitting; |
| 196 | { |
| 197 | if (nindy_fd) |
| 198 | close (nindy_fd); |
| 199 | nindy_fd = 0; |
| 200 | |
| 201 | if (savename) |
| 202 | free (savename); |
| 203 | savename = 0; |
| 204 | } |
| 205 | |
| 206 | /* Open a connection to a remote debugger. |
| 207 | FIXME, there should be a way to specify the various options that are |
| 208 | now specified with gdb command-line options. (baud_rate, old_protocol, |
| 209 | and initial_brk) */ |
| 210 | void |
| 211 | nindy_open (name, from_tty) |
| 212 | char *name; /* "/dev/ttyXX", "ttyXX", or "XX": tty to be opened */ |
| 213 | int from_tty; |
| 214 | { |
| 215 | |
| 216 | if (!name) |
| 217 | error_no_arg ("serial port device name"); |
| 218 | |
| 219 | target_preopen (from_tty); |
| 220 | |
| 221 | nindy_close (0); |
| 222 | |
| 223 | have_regs = regs_changed = 0; |
| 224 | dcache_init(); |
| 225 | |
| 226 | /* Allow user to interrupt the following -- we could hang if |
| 227 | * there's no NINDY at the other end of the remote tty. |
| 228 | */ |
| 229 | immediate_quit++; |
| 230 | nindy_fd = ninConnect( name, baud_rate? baud_rate: "9600", |
| 231 | nindy_initial_brk, !from_tty, nindy_old_protocol ); |
| 232 | immediate_quit--; |
| 233 | |
| 234 | if ( nindy_fd < 0 ){ |
| 235 | nindy_fd = 0; |
| 236 | error( "Can't open tty '%s'", name ); |
| 237 | } |
| 238 | |
| 239 | savename = savestring (name, strlen (name)); |
| 240 | push_target (&nindy_ops); |
| 241 | target_fetch_registers(-1); |
| 242 | } |
| 243 | |
| 244 | /* User-initiated quit of nindy operations. */ |
| 245 | |
| 246 | static void |
| 247 | nindy_detach (name, from_tty) |
| 248 | char *name; |
| 249 | int from_tty; |
| 250 | { |
| 251 | if (name) |
| 252 | error ("Too many arguments"); |
| 253 | pop_target (); |
| 254 | } |
| 255 | |
| 256 | static void |
| 257 | nindy_files_info () |
| 258 | { |
| 259 | printf("\tAttached to %s at %s bps%s%s.\n", savename, |
| 260 | baud_rate? baud_rate: "9600", |
| 261 | nindy_old_protocol? " in old protocol": "", |
| 262 | nindy_initial_brk? " with initial break": ""); |
| 263 | } |
| 264 | \f |
| 265 | /****************************************************************************** |
| 266 | * remote_load: |
| 267 | * Download an object file to the remote system by invoking the "comm960" |
| 268 | * utility. We look for "comm960" in $G960BIN, $G960BASE/bin, and |
| 269 | * DEFAULT_BASE/bin/HOST/bin where |
| 270 | * DEFAULT_BASE is defined in env.h, and |
| 271 | * HOST must be defined on the compiler invocation line. |
| 272 | ******************************************************************************/ |
| 273 | |
| 274 | static void |
| 275 | nindy_load( filename, from_tty ) |
| 276 | char *filename; |
| 277 | int from_tty; |
| 278 | { |
| 279 | asection *s; |
| 280 | /* Can't do unix style forking on a VMS system, so we'll use bfd to do |
| 281 | all the work for us |
| 282 | */ |
| 283 | |
| 284 | bfd *file = bfd_openr(filename,0); |
| 285 | if (!file) |
| 286 | { |
| 287 | perror_with_name(filename); |
| 288 | return; |
| 289 | } |
| 290 | |
| 291 | if (!bfd_check_format(file, bfd_object)) |
| 292 | { |
| 293 | error("can't prove it's an object file\n"); |
| 294 | return; |
| 295 | } |
| 296 | |
| 297 | for ( s = file->sections; s; s=s->next) |
| 298 | { |
| 299 | if (s->flags & SEC_LOAD) |
| 300 | { |
| 301 | char *buffer = xmalloc(s->_raw_size); |
| 302 | bfd_get_section_contents(file, s, buffer, 0, s->_raw_size); |
| 303 | printf("Loading section %s, size %x vma %x\n", |
| 304 | s->name, |
| 305 | s->_raw_size, |
| 306 | s->vma); |
| 307 | ninMemPut(s->vma, buffer, s->_raw_size); |
| 308 | free(buffer); |
| 309 | } |
| 310 | } |
| 311 | bfd_close(file); |
| 312 | } |
| 313 | |
| 314 | /* Return the number of characters in the buffer before the first DLE character. |
| 315 | */ |
| 316 | |
| 317 | static |
| 318 | int |
| 319 | non_dle( buf, n ) |
| 320 | char *buf; /* Character buffer; NOT '\0'-terminated */ |
| 321 | int n; /* Number of characters in buffer */ |
| 322 | { |
| 323 | int i; |
| 324 | |
| 325 | for ( i = 0; i < n; i++ ){ |
| 326 | if ( buf[i] == DLE ){ |
| 327 | break; |
| 328 | } |
| 329 | } |
| 330 | return i; |
| 331 | } |
| 332 | \f |
| 333 | /* Tell the remote machine to resume. */ |
| 334 | |
| 335 | void |
| 336 | nindy_resume (step, siggnal) |
| 337 | int step, siggnal; |
| 338 | { |
| 339 | if (siggnal != 0 && siggnal != stop_signal) |
| 340 | error ("Can't send signals to remote NINDY targets."); |
| 341 | |
| 342 | dcache_flush(); |
| 343 | if ( regs_changed ){ |
| 344 | nindy_store_registers (); |
| 345 | regs_changed = 0; |
| 346 | } |
| 347 | have_regs = 0; |
| 348 | ninGo( step ); |
| 349 | } |
| 350 | |
| 351 | /* Wait until the remote machine stops. While waiting, operate in passthrough |
| 352 | * mode; i.e., pass everything NINDY sends to stdout, and everything from |
| 353 | * stdin to NINDY. |
| 354 | * |
| 355 | * Return to caller, storing status in 'status' just as `wait' would. |
| 356 | */ |
| 357 | |
| 358 | void |
| 359 | nindy_wait( status ) |
| 360 | WAITTYPE *status; |
| 361 | { |
| 362 | DEMUX_DECL; /* OS-dependent data needed by DEMUX... macros */ |
| 363 | char buf[500]; /* FIXME, what is "500" here? */ |
| 364 | int i, n; |
| 365 | unsigned char stop_exit; |
| 366 | unsigned char stop_code; |
| 367 | TTY_STRUCT tty; |
| 368 | long ip_value, fp_value, sp_value; /* Reg values from stop */ |
| 369 | |
| 370 | |
| 371 | WSETEXIT( (*status), 0 ); |
| 372 | |
| 373 | /* OPERATE IN PASSTHROUGH MODE UNTIL NINDY SENDS A DLE CHARACTER */ |
| 374 | |
| 375 | /* Save current tty attributes, set up signals to restore them. |
| 376 | */ |
| 377 | ioctl( 0, TIOCGETP, &orig_tty ); |
| 378 | old_ctrlc = signal( SIGINT, cleanup ); |
| 379 | #ifdef SIGTSTP |
| 380 | old_ctrlz = signal( SIGTSTP, cleanup ); |
| 381 | #endif |
| 382 | |
| 383 | /* Pass input from keyboard to NINDY as it arrives. |
| 384 | * NINDY will interpret <CR> and perform echo. |
| 385 | */ |
| 386 | tty = orig_tty; |
| 387 | TTY_NINDYTERM( tty ); |
| 388 | ioctl( 0, TIOCSETN, &tty ); |
| 389 | |
| 390 | while ( 1 ){ |
| 391 | /* Go to sleep until there's something for us on either |
| 392 | * the remote port or stdin. |
| 393 | */ |
| 394 | |
| 395 | DEMUX_WAIT( nindy_fd ); |
| 396 | |
| 397 | /* Pass input through to correct place */ |
| 398 | |
| 399 | n = DEMUX_READ( 0, buf, sizeof(buf) ); |
| 400 | if ( n ){ /* Input on stdin */ |
| 401 | write( nindy_fd, buf, n ); |
| 402 | } |
| 403 | |
| 404 | n = DEMUX_READ( nindy_fd, buf, sizeof(buf) ); |
| 405 | if ( n ){ /* Input on remote */ |
| 406 | /* Write out any characters in buffer preceding DLE */ |
| 407 | i = non_dle( buf, n ); |
| 408 | if ( i > 0 ){ |
| 409 | write( 1, buf, i ); |
| 410 | } |
| 411 | |
| 412 | if ( i != n ){ |
| 413 | /* There *was* a DLE in the buffer */ |
| 414 | stop_exit = ninStopWhy( &stop_code, |
| 415 | &ip_value, &fp_value, &sp_value); |
| 416 | if ( !stop_exit && (stop_code==STOP_SRQ) ){ |
| 417 | immediate_quit++; |
| 418 | ninSrq(); |
| 419 | immediate_quit--; |
| 420 | } else { |
| 421 | /* Get out of loop */ |
| 422 | supply_register (IP_REGNUM, &ip_value); |
| 423 | supply_register (FP_REGNUM, &fp_value); |
| 424 | supply_register (SP_REGNUM, &sp_value); |
| 425 | break; |
| 426 | } |
| 427 | } |
| 428 | } |
| 429 | } |
| 430 | |
| 431 | signal( SIGINT, old_ctrlc ); |
| 432 | #ifdef SIGTSTP |
| 433 | signal( SIGTSTP, old_ctrlz ); |
| 434 | #endif |
| 435 | restore_tty(); |
| 436 | |
| 437 | if ( stop_exit ){ /* User program exited */ |
| 438 | WSETEXIT( (*status), stop_code ); |
| 439 | } else { /* Fault or trace */ |
| 440 | switch (stop_code){ |
| 441 | case STOP_GDB_BPT: |
| 442 | case TRACE_STEP: |
| 443 | /* Make it look like a VAX trace trap */ |
| 444 | stop_code = SIGTRAP; |
| 445 | break; |
| 446 | default: |
| 447 | /* The target is not running Unix, and its |
| 448 | faults/traces do not map nicely into Unix signals. |
| 449 | Make sure they do not get confused with Unix signals |
| 450 | by numbering them with values higher than the highest |
| 451 | legal Unix signal. code in i960_print_fault(), |
| 452 | called via PRINT_RANDOM_SIGNAL, will interpret the |
| 453 | value. */ |
| 454 | stop_code += NSIG; |
| 455 | break; |
| 456 | } |
| 457 | WSETSTOP( (*status), stop_code ); |
| 458 | } |
| 459 | } |
| 460 | |
| 461 | /* Read the remote registers into the block REGS. */ |
| 462 | |
| 463 | /* This is the block that ninRegsGet and ninRegsPut handles. */ |
| 464 | struct nindy_regs { |
| 465 | char local_regs[16 * 4]; |
| 466 | char global_regs[16 * 4]; |
| 467 | char pcw_acw[2 * 4]; |
| 468 | char ip[4]; |
| 469 | char tcw[4]; |
| 470 | char fp_as_double[4 * 8]; |
| 471 | }; |
| 472 | |
| 473 | static void |
| 474 | nindy_fetch_registers(regno) |
| 475 | int regno; |
| 476 | { |
| 477 | struct nindy_regs nindy_regs; |
| 478 | int regnum, inv; |
| 479 | double dub; |
| 480 | |
| 481 | immediate_quit++; |
| 482 | ninRegsGet( (char *) &nindy_regs ); |
| 483 | immediate_quit--; |
| 484 | |
| 485 | bcopy (nindy_regs.local_regs, ®isters[REGISTER_BYTE (R0_REGNUM)], 16*4); |
| 486 | bcopy (nindy_regs.global_regs, ®isters[REGISTER_BYTE (G0_REGNUM)], 16*4); |
| 487 | bcopy (nindy_regs.pcw_acw, ®isters[REGISTER_BYTE (PCW_REGNUM)], 2*4); |
| 488 | bcopy (nindy_regs.ip, ®isters[REGISTER_BYTE (IP_REGNUM)], 1*4); |
| 489 | bcopy (nindy_regs.tcw, ®isters[REGISTER_BYTE (TCW_REGNUM)], 1*4); |
| 490 | for (regnum = FP0_REGNUM; regnum < FP0_REGNUM + 4; regnum++) { |
| 491 | dub = unpack_double (builtin_type_double, |
| 492 | &nindy_regs.fp_as_double[8 * (regnum - FP0_REGNUM)], |
| 493 | &inv); |
| 494 | /* dub now in host byte order */ |
| 495 | double_to_ieee_extended (&ext_format_i960, &dub, |
| 496 | ®isters[REGISTER_BYTE (regnum)]); |
| 497 | } |
| 498 | |
| 499 | registers_fetched (); |
| 500 | } |
| 501 | |
| 502 | static void |
| 503 | nindy_prepare_to_store() |
| 504 | { |
| 505 | /* Fetch all regs if they aren't already here. */ |
| 506 | read_register_bytes (0, NULL, REGISTER_BYTES); |
| 507 | } |
| 508 | |
| 509 | static void |
| 510 | nindy_store_registers(regno) |
| 511 | int regno; |
| 512 | { |
| 513 | struct nindy_regs nindy_regs; |
| 514 | int regnum, inv; |
| 515 | double dub; |
| 516 | |
| 517 | bcopy (®isters[REGISTER_BYTE (R0_REGNUM)], nindy_regs.local_regs, 16*4); |
| 518 | bcopy (®isters[REGISTER_BYTE (G0_REGNUM)], nindy_regs.global_regs, 16*4); |
| 519 | bcopy (®isters[REGISTER_BYTE (PCW_REGNUM)], nindy_regs.pcw_acw, 2*4); |
| 520 | bcopy (®isters[REGISTER_BYTE (IP_REGNUM)], nindy_regs.ip, 1*4); |
| 521 | bcopy (®isters[REGISTER_BYTE (TCW_REGNUM)], nindy_regs.tcw, 1*4); |
| 522 | /* Float regs. Only works on IEEE_FLOAT hosts. */ |
| 523 | for (regnum = FP0_REGNUM; regnum < FP0_REGNUM + 4; regnum++) { |
| 524 | ieee_extended_to_double (&ext_format_i960, |
| 525 | ®isters[REGISTER_BYTE (regnum)], &dub); |
| 526 | /* dub now in host byte order */ |
| 527 | /* FIXME-someday, the arguments to unpack_double are backward. |
| 528 | It expects a target double and returns a host; we pass the opposite. |
| 529 | This mostly works but not quite. */ |
| 530 | dub = unpack_double (builtin_type_double, &dub, &inv); |
| 531 | /* dub now in target byte order */ |
| 532 | bcopy ((char *)&dub, &nindy_regs.fp_as_double[8 * (regnum - FP0_REGNUM)], |
| 533 | 8); |
| 534 | } |
| 535 | |
| 536 | immediate_quit++; |
| 537 | ninRegsPut( (char *) &nindy_regs ); |
| 538 | immediate_quit--; |
| 539 | } |
| 540 | |
| 541 | /* Read a word from remote address ADDR and return it. |
| 542 | * This goes through the data cache. |
| 543 | */ |
| 544 | int |
| 545 | nindy_fetch_word (addr) |
| 546 | CORE_ADDR addr; |
| 547 | { |
| 548 | return dcache_fetch (addr); |
| 549 | } |
| 550 | |
| 551 | /* Write a word WORD into remote address ADDR. |
| 552 | This goes through the data cache. */ |
| 553 | |
| 554 | void |
| 555 | nindy_store_word (addr, word) |
| 556 | CORE_ADDR addr; |
| 557 | int word; |
| 558 | { |
| 559 | dcache_poke (addr, word); |
| 560 | } |
| 561 | |
| 562 | /* Copy LEN bytes to or from inferior's memory starting at MEMADDR |
| 563 | to debugger memory starting at MYADDR. Copy to inferior if |
| 564 | WRITE is nonzero. Returns the length copied. |
| 565 | |
| 566 | This is stolen almost directly from infptrace.c's child_xfer_memory, |
| 567 | which also deals with a word-oriented memory interface. Sometime, |
| 568 | FIXME, rewrite this to not use the word-oriented routines. */ |
| 569 | |
| 570 | int |
| 571 | nindy_xfer_inferior_memory(memaddr, myaddr, len, write, target) |
| 572 | CORE_ADDR memaddr; |
| 573 | char *myaddr; |
| 574 | int len; |
| 575 | int write; |
| 576 | struct target_ops *target; /* ignored */ |
| 577 | { |
| 578 | register int i; |
| 579 | /* Round starting address down to longword boundary. */ |
| 580 | register CORE_ADDR addr = memaddr & - sizeof (int); |
| 581 | /* Round ending address up; get number of longwords that makes. */ |
| 582 | register int count |
| 583 | = (((memaddr + len) - addr) + sizeof (int) - 1) / sizeof (int); |
| 584 | /* Allocate buffer of that many longwords. */ |
| 585 | register int *buffer = (int *) alloca (count * sizeof (int)); |
| 586 | |
| 587 | if (write) |
| 588 | { |
| 589 | /* Fill start and end extra bytes of buffer with existing memory data. */ |
| 590 | |
| 591 | if (addr != memaddr || len < (int)sizeof (int)) { |
| 592 | /* Need part of initial word -- fetch it. */ |
| 593 | buffer[0] = nindy_fetch_word (addr); |
| 594 | } |
| 595 | |
| 596 | if (count > 1) /* FIXME, avoid if even boundary */ |
| 597 | { |
| 598 | buffer[count - 1] |
| 599 | = nindy_fetch_word (addr + (count - 1) * sizeof (int)); |
| 600 | } |
| 601 | |
| 602 | /* Copy data to be written over corresponding part of buffer */ |
| 603 | |
| 604 | bcopy (myaddr, (char *) buffer + (memaddr & (sizeof (int) - 1)), len); |
| 605 | |
| 606 | /* Write the entire buffer. */ |
| 607 | |
| 608 | for (i = 0; i < count; i++, addr += sizeof (int)) |
| 609 | { |
| 610 | errno = 0; |
| 611 | nindy_store_word (addr, buffer[i]); |
| 612 | if (errno) |
| 613 | return 0; |
| 614 | } |
| 615 | } |
| 616 | else |
| 617 | { |
| 618 | /* Read all the longwords */ |
| 619 | for (i = 0; i < count; i++, addr += sizeof (int)) |
| 620 | { |
| 621 | errno = 0; |
| 622 | buffer[i] = nindy_fetch_word (addr); |
| 623 | if (errno) |
| 624 | return 0; |
| 625 | QUIT; |
| 626 | } |
| 627 | |
| 628 | /* Copy appropriate bytes out of the buffer. */ |
| 629 | bcopy ((char *) buffer + (memaddr & (sizeof (int) - 1)), myaddr, len); |
| 630 | } |
| 631 | return len; |
| 632 | } |
| 633 | \f |
| 634 | /* The data cache records all the data read from the remote machine |
| 635 | since the last time it stopped. |
| 636 | |
| 637 | Each cache block holds 16 bytes of data |
| 638 | starting at a multiple-of-16 address. */ |
| 639 | |
| 640 | #define DCACHE_SIZE 64 /* Number of cache blocks */ |
| 641 | |
| 642 | struct dcache_block { |
| 643 | struct dcache_block *next, *last; |
| 644 | unsigned int addr; /* Address for which data is recorded. */ |
| 645 | int data[4]; |
| 646 | }; |
| 647 | |
| 648 | struct dcache_block dcache_free, dcache_valid; |
| 649 | |
| 650 | /* Free all the data cache blocks, thus discarding all cached data. */ |
| 651 | static |
| 652 | void |
| 653 | dcache_flush () |
| 654 | { |
| 655 | register struct dcache_block *db; |
| 656 | |
| 657 | while ((db = dcache_valid.next) != &dcache_valid) |
| 658 | { |
| 659 | remque (db); |
| 660 | insque (db, &dcache_free); |
| 661 | } |
| 662 | } |
| 663 | |
| 664 | /* |
| 665 | * If addr is present in the dcache, return the address of the block |
| 666 | * containing it. |
| 667 | */ |
| 668 | static |
| 669 | struct dcache_block * |
| 670 | dcache_hit (addr) |
| 671 | unsigned int addr; |
| 672 | { |
| 673 | register struct dcache_block *db; |
| 674 | |
| 675 | if (addr & 3) |
| 676 | abort (); |
| 677 | |
| 678 | /* Search all cache blocks for one that is at this address. */ |
| 679 | db = dcache_valid.next; |
| 680 | while (db != &dcache_valid) |
| 681 | { |
| 682 | if ((addr & 0xfffffff0) == db->addr) |
| 683 | return db; |
| 684 | db = db->next; |
| 685 | } |
| 686 | return NULL; |
| 687 | } |
| 688 | |
| 689 | /* Return the int data at address ADDR in dcache block DC. */ |
| 690 | static |
| 691 | int |
| 692 | dcache_value (db, addr) |
| 693 | struct dcache_block *db; |
| 694 | unsigned int addr; |
| 695 | { |
| 696 | if (addr & 3) |
| 697 | abort (); |
| 698 | return (db->data[(addr>>2)&3]); |
| 699 | } |
| 700 | |
| 701 | /* Get a free cache block, put or keep it on the valid list, |
| 702 | and return its address. The caller should store into the block |
| 703 | the address and data that it describes, then remque it from the |
| 704 | free list and insert it into the valid list. This procedure |
| 705 | prevents errors from creeping in if a ninMemGet is interrupted |
| 706 | (which used to put garbage blocks in the valid list...). */ |
| 707 | static |
| 708 | struct dcache_block * |
| 709 | dcache_alloc () |
| 710 | { |
| 711 | register struct dcache_block *db; |
| 712 | |
| 713 | if ((db = dcache_free.next) == &dcache_free) |
| 714 | { |
| 715 | /* If we can't get one from the free list, take last valid and put |
| 716 | it on the free list. */ |
| 717 | db = dcache_valid.last; |
| 718 | remque (db); |
| 719 | insque (db, &dcache_free); |
| 720 | } |
| 721 | |
| 722 | remque (db); |
| 723 | insque (db, &dcache_valid); |
| 724 | return (db); |
| 725 | } |
| 726 | |
| 727 | /* Return the contents of the word at address ADDR in the remote machine, |
| 728 | using the data cache. */ |
| 729 | static |
| 730 | int |
| 731 | dcache_fetch (addr) |
| 732 | CORE_ADDR addr; |
| 733 | { |
| 734 | register struct dcache_block *db; |
| 735 | |
| 736 | db = dcache_hit (addr); |
| 737 | if (db == 0) |
| 738 | { |
| 739 | db = dcache_alloc (); |
| 740 | immediate_quit++; |
| 741 | ninMemGet(addr & ~0xf, (unsigned char *)db->data, 16); |
| 742 | immediate_quit--; |
| 743 | db->addr = addr & ~0xf; |
| 744 | remque (db); /* Off the free list */ |
| 745 | insque (db, &dcache_valid); /* On the valid list */ |
| 746 | } |
| 747 | return (dcache_value (db, addr)); |
| 748 | } |
| 749 | |
| 750 | /* Write the word at ADDR both in the data cache and in the remote machine. */ |
| 751 | static void |
| 752 | dcache_poke (addr, data) |
| 753 | CORE_ADDR addr; |
| 754 | int data; |
| 755 | { |
| 756 | register struct dcache_block *db; |
| 757 | |
| 758 | /* First make sure the word is IN the cache. DB is its cache block. */ |
| 759 | db = dcache_hit (addr); |
| 760 | if (db == 0) |
| 761 | { |
| 762 | db = dcache_alloc (); |
| 763 | immediate_quit++; |
| 764 | ninMemGet(addr & ~0xf, (unsigned char *)db->data, 16); |
| 765 | immediate_quit--; |
| 766 | db->addr = addr & ~0xf; |
| 767 | remque (db); /* Off the free list */ |
| 768 | insque (db, &dcache_valid); /* On the valid list */ |
| 769 | } |
| 770 | |
| 771 | /* Modify the word in the cache. */ |
| 772 | db->data[(addr>>2)&3] = data; |
| 773 | |
| 774 | /* Send the changed word. */ |
| 775 | immediate_quit++; |
| 776 | ninMemPut(addr, (unsigned char *)&data, 4); |
| 777 | immediate_quit--; |
| 778 | } |
| 779 | |
| 780 | /* The cache itself. */ |
| 781 | struct dcache_block the_cache[DCACHE_SIZE]; |
| 782 | |
| 783 | /* Initialize the data cache. */ |
| 784 | static void |
| 785 | dcache_init () |
| 786 | { |
| 787 | register i; |
| 788 | register struct dcache_block *db; |
| 789 | |
| 790 | db = the_cache; |
| 791 | dcache_free.next = dcache_free.last = &dcache_free; |
| 792 | dcache_valid.next = dcache_valid.last = &dcache_valid; |
| 793 | for (i=0;i<DCACHE_SIZE;i++,db++) |
| 794 | insque (db, &dcache_free); |
| 795 | } |
| 796 | |
| 797 | |
| 798 | static void |
| 799 | nindy_create_inferior (execfile, args, env) |
| 800 | char *execfile; |
| 801 | char *args; |
| 802 | char **env; |
| 803 | { |
| 804 | int entry_pt; |
| 805 | int pid; |
| 806 | |
| 807 | if (args && *args) |
| 808 | error ("Can't pass arguments to remote NINDY process"); |
| 809 | |
| 810 | if (execfile == 0 || exec_bfd == 0) |
| 811 | error ("No exec file specified"); |
| 812 | |
| 813 | entry_pt = (int) bfd_get_start_address (exec_bfd); |
| 814 | |
| 815 | pid = 42; |
| 816 | |
| 817 | #ifdef CREATE_INFERIOR_HOOK |
| 818 | CREATE_INFERIOR_HOOK (pid); |
| 819 | #endif |
| 820 | |
| 821 | /* The "process" (board) is already stopped awaiting our commands, and |
| 822 | the program is already downloaded. We just set its PC and go. */ |
| 823 | |
| 824 | inferior_pid = pid; /* Needed for wait_for_inferior below */ |
| 825 | |
| 826 | clear_proceed_status (); |
| 827 | |
| 828 | /* Tell wait_for_inferior that we've started a new process. */ |
| 829 | init_wait_for_inferior (); |
| 830 | |
| 831 | /* Set up the "saved terminal modes" of the inferior |
| 832 | based on what modes we are starting it with. */ |
| 833 | target_terminal_init (); |
| 834 | |
| 835 | /* Install inferior's terminal modes. */ |
| 836 | target_terminal_inferior (); |
| 837 | |
| 838 | /* insert_step_breakpoint (); FIXME, do we need this? */ |
| 839 | proceed ((CORE_ADDR)entry_pt, -1, 0); /* Let 'er rip... */ |
| 840 | } |
| 841 | |
| 842 | static void |
| 843 | reset_command(args, from_tty) |
| 844 | char *args; |
| 845 | int from_tty; |
| 846 | { |
| 847 | if ( !nindy_fd ){ |
| 848 | error( "No target system to reset -- use 'target nindy' command."); |
| 849 | } |
| 850 | if ( query("Really reset the target system?",0,0) ){ |
| 851 | send_break( nindy_fd ); |
| 852 | tty_flush( nindy_fd ); |
| 853 | } |
| 854 | } |
| 855 | |
| 856 | void |
| 857 | nindy_kill (args, from_tty) |
| 858 | char *args; |
| 859 | int from_tty; |
| 860 | { |
| 861 | return; /* Ignore attempts to kill target system */ |
| 862 | } |
| 863 | |
| 864 | /* Clean up when a program exits. |
| 865 | |
| 866 | The program actually lives on in the remote processor's RAM, and may be |
| 867 | run again without a download. Don't leave it full of breakpoint |
| 868 | instructions. */ |
| 869 | |
| 870 | void |
| 871 | nindy_mourn_inferior () |
| 872 | { |
| 873 | remove_breakpoints (); |
| 874 | generic_mourn_inferior (); /* Do all the proper things now */ |
| 875 | } |
| 876 | \f |
| 877 | /* This routine is run as a hook, just before the main command loop is |
| 878 | entered. If gdb is configured for the i960, but has not had its |
| 879 | nindy target specified yet, this will loop prompting the user to do so. |
| 880 | |
| 881 | Unlike the loop provided by Intel, we actually let the user get out |
| 882 | of this with a RETURN. This is useful when e.g. simply examining |
| 883 | an i960 object file on the host system. */ |
| 884 | |
| 885 | nindy_before_main_loop () |
| 886 | { |
| 887 | char ttyname[100]; |
| 888 | char *p, *p2; |
| 889 | |
| 890 | setjmp(to_top_level); |
| 891 | while (current_target != &nindy_ops) { /* remote tty not specified yet */ |
| 892 | if ( instream == stdin ){ |
| 893 | printf("\nAttach /dev/ttyNN -- specify NN, or \"quit\" to quit: "); |
| 894 | fflush( stdout ); |
| 895 | } |
| 896 | fgets( ttyname, sizeof(ttyname)-1, stdin ); |
| 897 | |
| 898 | /* Strip leading and trailing whitespace */ |
| 899 | for ( p = ttyname; isspace(*p); p++ ){ |
| 900 | ; |
| 901 | } |
| 902 | if ( *p == '\0' ){ |
| 903 | return; /* User just hit spaces or return, wants out */ |
| 904 | } |
| 905 | for ( p2= p; !isspace(*p2) && (*p2 != '\0'); p2++ ){ |
| 906 | ; |
| 907 | } |
| 908 | *p2= '\0'; |
| 909 | if ( !strcmp("quit",p) ){ |
| 910 | exit(1); |
| 911 | } |
| 912 | |
| 913 | nindy_open( p, 1 ); |
| 914 | |
| 915 | /* Now that we have a tty open for talking to the remote machine, |
| 916 | download the executable file if one was specified. */ |
| 917 | if ( !setjmp(to_top_level) && exec_bfd ) { |
| 918 | target_load (bfd_get_filename (exec_bfd), 1); |
| 919 | } |
| 920 | } |
| 921 | } |
| 922 | \f |
| 923 | /* Define the target subroutine names */ |
| 924 | |
| 925 | struct target_ops nindy_ops = { |
| 926 | "nindy", "Remote serial target in i960 NINDY-specific protocol", |
| 927 | "Use a remote i960 system running NINDY connected by a serial line.\n\ |
| 928 | Specify the name of the device the serial line is connected to.\n\ |
| 929 | The speed (baud rate), whether to use the old NINDY protocol,\n\ |
| 930 | and whether to send a break on startup, are controlled by options\n\ |
| 931 | specified when you started GDB.", |
| 932 | nindy_open, nindy_close, |
| 933 | 0, nindy_detach, nindy_resume, nindy_wait, |
| 934 | nindy_fetch_registers, nindy_store_registers, |
| 935 | nindy_prepare_to_store, |
| 936 | nindy_xfer_inferior_memory, nindy_files_info, |
| 937 | 0, 0, /* insert_breakpoint, remove_breakpoint, */ |
| 938 | 0, 0, 0, 0, 0, /* Terminal crud */ |
| 939 | nindy_kill, |
| 940 | nindy_load, |
| 941 | 0, /* lookup_symbol */ |
| 942 | nindy_create_inferior, |
| 943 | nindy_mourn_inferior, |
| 944 | 0, /* can_run */ |
| 945 | 0, /* notice_signals */ |
| 946 | process_stratum, 0, /* next */ |
| 947 | 1, 1, 1, 1, 1, /* all mem, mem, stack, regs, exec */ |
| 948 | 0, 0, /* Section pointers */ |
| 949 | OPS_MAGIC, /* Always the last thing */ |
| 950 | }; |
| 951 | |
| 952 | void |
| 953 | _initialize_nindy () |
| 954 | { |
| 955 | add_target (&nindy_ops); |
| 956 | add_com ("reset", class_obscure, reset_command, |
| 957 | "Send a 'break' to the remote target system.\n\ |
| 958 | Only useful if the target has been equipped with a circuit\n\ |
| 959 | to perform a hard reset when a break is detected."); |
| 960 | } |