gdb/remote-vx.c

   1 /* Memory-access and commands for remote VxWorks processes, for GDB.
   2    Copyright 1990, 1991, 1992 Free Software Foundation, Inc.
   3    Contributed by Wind River Systems and Cygnus Support.
   4
   5 This file is part of GDB.
   6
   7 This program is free software; you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation; either version 2 of the License, or
  10 (at your option) any later version.
  11
  12 This program is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with this program; if not, write to the Free Software
  19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
  20
  21 #include "defs.h"
  22 #include "frame.h"
  23 #include "inferior.h"
  24 #include "wait.h"
  25 #include "target.h"
  26 #include "gdbcore.h"
  27 #include "command.h"
  28 #include "symtab.h"
  29 #include "complaints.h"
  30 #include "gdbcmd.h"
  31
  32 #include <string.h>
  33 #include <errno.h>
  34 #include <signal.h>
  35 #include <fcntl.h>
  36 #include <sys/types.h>
  37 #include <sys/socket.h>
  38 #define malloc bogon_malloc     /* Sun claims "char *malloc()" not void * */
  39 #define free bogon_free         /* Sun claims "int free()" not void */
  40 #define realloc bogon_realloc   /* Sun claims "char *realloc()", not void * */
  41 #include <rpc/rpc.h>
  42 #undef malloc
  43 #undef free
  44 #undef realloc
  45 #include <sys/time.h>           /* UTek's <rpc/rpc.h> doesn't #incl this */
  46 #include <netdb.h>
  47 #include "vx-share/ptrace.h"
  48 #include "vx-share/xdr_ptrace.h"
  49 #include "vx-share/xdr_ld.h"
  50 #include "vx-share/xdr_rdb.h"
  51 #include "vx-share/dbgRpcLib.h"
  52
  53 #include <symtab.h>
  54
  55 extern void symbol_file_command ();
  56 extern int stop_soon_quietly;           /* for wait_for_inferior */
  57
  58 static int net_ptrace_clnt_call ();     /* Forward decl */
  59 static enum clnt_stat net_clnt_call (); /* Forward decl */
  60 extern struct target_ops vx_ops, vx_run_ops;    /* Forward declaration */
  61
  62 /* Saved name of target host and called function for "info files".
  63    Both malloc'd.  */
  64
  65 static char *vx_host;
  66 static char *vx_running;                /* Called function */
  67
  68 /* Nonzero means target that is being debugged remotely has a floating
  69    point processor.  */
  70
  71 static int target_has_fp;
  72
  73 /* Default error message when the network is forking up.  */
  74
  75 static const char rpcerr[] = "network target debugging:  rpc error";
  76
  77 CLIENT *pClient;         /* client used in net debugging */
  78 static int ptraceSock = RPC_ANYSOCK;
  79
  80 enum clnt_stat net_clnt_call();
  81 static void parse_args ();
  82
  83 static struct timeval rpcTimeout = { 10, 0 };
  84
  85 static char *skip_white_space ();
  86 static char *find_white_space ();
  87
  88 /* Tell the VxWorks target system to download a file.
  89    The load addresses of the text, data, and bss segments are
  90    stored in *pTextAddr, *pDataAddr, and *pBssAddr (respectively).
  91    Returns 0 for success, -1 for failure.  */
  92
  93 static int
  94 net_load (filename, pTextAddr, pDataAddr, pBssAddr)
  95     char *filename;
  96     CORE_ADDR *pTextAddr;
  97     CORE_ADDR *pDataAddr;
  98     CORE_ADDR *pBssAddr;
  99     {
 100     enum clnt_stat status;
 101     struct ldfile ldstruct;
 102     struct timeval load_timeout;
 103
 104     memset ((char *) &ldstruct, '\0', sizeof (ldstruct));
 105
 106     /* We invoke clnt_call () here directly, instead of through
 107        net_clnt_call (), because we need to set a large timeout value.
 108        The load on the target side can take quite a while, easily
 109        more than 10 seconds.  The user can kill this call by typing
 110        CTRL-C if there really is a problem with the load.
 111
 112        Do not change the tv_sec value without checking -- select() imposes
 113        a limit of 10**8 on it for no good reason that I can see...  */
 114
 115     load_timeout.tv_sec = 99999999;   /* A large number, effectively inf. */
 116     load_timeout.tv_usec = 0;
 117
 118     status = clnt_call (pClient, VX_LOAD, xdr_wrapstring, &filename, xdr_ldfile,
 119                         &ldstruct, load_timeout);
 120
 121     if (status == RPC_SUCCESS)
 122       {
 123         if (*ldstruct.name == 0)        /* load failed on VxWorks side */
 124           return -1;
 125         *pTextAddr = ldstruct.txt_addr;
 126         *pDataAddr = ldstruct.data_addr;
 127         *pBssAddr = ldstruct.bss_addr;
 128         return 0;
 129       }
 130     else
 131         return -1;
 132     }
 133
 134 /* returns 0 if successful, errno if RPC failed or VxWorks complains. */
 135
 136 static int
 137 net_break (addr, procnum)
 138     int addr;
 139     u_long procnum;
 140     {
 141     enum clnt_stat status;
 142     int break_status;
 143     Rptrace ptrace_in;  /* XXX This is stupid.  It doesn't need to be a ptrace
 144                            structure.  How about something smaller? */
 145
 146     memset ((char *) &ptrace_in, '\0', sizeof (ptrace_in));
 147     break_status = 0;
 148
 149     ptrace_in.addr = addr;
 150     ptrace_in.pid = inferior_pid;
 151
 152     status = net_clnt_call (procnum, xdr_rptrace, &ptrace_in, xdr_int,
 153                             &break_status);
 154
 155     if (status != RPC_SUCCESS)
 156         return errno;
 157
 158     if (break_status == -1)
 159       return ENOMEM;
 160     return break_status;        /* probably (FIXME) zero */
 161     }
 162
 163 /* returns 0 if successful, errno otherwise */
 164
 165 static int
 166 vx_insert_breakpoint (addr)
 167     int addr;
 168     {
 169     return net_break (addr, VX_BREAK_ADD);
 170     }
 171
 172 /* returns 0 if successful, errno otherwise */
 173
 174 static int
 175 vx_remove_breakpoint (addr)
 176     int addr;
 177     {
 178     return net_break (addr, VX_BREAK_DELETE);
 179     }
 180
 181 /* Start an inferior process and sets inferior_pid to its pid.
 182    EXEC_FILE is the file to run.
 183    ALLARGS is a string containing the arguments to the program.
 184    ENV is the environment vector to pass.
 185    Returns process id.  Errors reported with error().
 186    On VxWorks, we ignore exec_file.  */
 187
 188 static void
 189 vx_create_inferior (exec_file, args, env)
 190      char *exec_file;
 191      char *args;
 192      char **env;
 193 {
 194   enum clnt_stat status;
 195   arg_array passArgs;
 196   TASK_START taskStart;
 197
 198   memset ((char *) &passArgs, '\0', sizeof (passArgs));
 199   memset ((char *) &taskStart, '\0', sizeof (taskStart));
 200
 201   /* parse arguments, put them in passArgs */
 202
 203   parse_args (args, &passArgs);
 204
 205   if (passArgs.arg_array_len == 0)
 206     error ("You must specify a function name to run, and arguments if any");
 207
 208   status = net_clnt_call (PROCESS_START, xdr_arg_array, &passArgs,
 209                           xdr_TASK_START, &taskStart);
 210
 211   if ((status != RPC_SUCCESS) || (taskStart.status == -1))
 212     error ("Can't create process on remote target machine");
 213
 214   /* Save the name of the running function */
 215   vx_running = savestring (passArgs.arg_array_val[0],
 216                            strlen (passArgs.arg_array_val[0]));
 217
 218 #ifdef CREATE_INFERIOR_HOOK
 219   CREATE_INFERIOR_HOOK (pid);
 220 #endif
 221
 222   push_target (&vx_run_ops);
 223   inferior_pid = taskStart.pid;
 224
 225   /* We will get a trace trap after one instruction.
 226      Insert breakpoints and continue.  */
 227
 228   init_wait_for_inferior ();
 229
 230   /* Set up the "saved terminal modes" of the inferior
 231      based on what modes we are starting it with.  */
 232   target_terminal_init ();
 233
 234   /* Install inferior's terminal modes.  */
 235   target_terminal_inferior ();
 236
 237   stop_soon_quietly = 1;
 238   wait_for_inferior ();         /* Get the task spawn event */
 239   stop_soon_quietly = 0;
 240
 241   /* insert_step_breakpoint ();  FIXME, do we need this?  */
 242   proceed(-1, -1, 0);
 243 }
 244
 245 /* Fill ARGSTRUCT in argc/argv form with the arguments from the
 246    argument string ARGSTRING.  */
 247
 248 static void
 249 parse_args (arg_string, arg_struct)
 250      register char *arg_string;
 251      arg_array *arg_struct;
 252 {
 253   register int arg_count = 0;   /* number of arguments */
 254   register int arg_index = 0;
 255   register char *p0;
 256
 257   memset ((char *) arg_struct, '\0', sizeof (arg_array));
 258
 259   /* first count how many arguments there are */
 260
 261   p0 = arg_string;
 262   while (*p0 != '\0')
 263     {
 264       if (*(p0 = skip_white_space (p0)) == '\0')
 265         break;
 266       p0 = find_white_space (p0);
 267       arg_count++;
 268     }
 269
 270   arg_struct->arg_array_len = arg_count;
 271   arg_struct->arg_array_val = (char **) xmalloc ((arg_count + 1)
 272                                                  * sizeof (char *));
 273
 274   /* now copy argument strings into arg_struct.  */
 275
 276   while (*(arg_string = skip_white_space (arg_string)))
 277     {
 278       p0 = find_white_space (arg_string);
 279       arg_struct->arg_array_val[arg_index++] = savestring (arg_string,
 280                                                            p0 - arg_string);
 281       arg_string = p0;
 282     }
 283
 284   arg_struct->arg_array_val[arg_count] = NULL;
 285 }
 286
 287 /* Advance a string pointer across whitespace and return a pointer
 288    to the first non-white character.  */
 289
 290 static char *
 291 skip_white_space (p)
 292      register char *p;
 293 {
 294   while (*p == ' ' || *p == '\t')
 295     p++;
 296   return p;
 297 }
 298
 299 /* Search for the first unquoted whitespace character in a string.
 300    Returns a pointer to the character, or to the null terminator
 301    if no whitespace is found.  */
 302
 303 static char *
 304 find_white_space (p)
 305      register char *p;
 306 {
 307   register int c;
 308
 309   while ((c = *p) != ' ' && c != '\t' && c)
 310     {
 311       if (c == '\'' || c == '"')
 312         {
 313           while (*++p != c && *p)
 314             {
 315               if (*p == '\\')
 316                 p++;
 317             }
 318           if (!*p)
 319             break;
 320         }
 321       p++;
 322     }
 323   return p;
 324 }
 325
 326 /* Poll the VxWorks target system for an event related
 327    to the debugged task.
 328    Returns -1 if remote wait failed, task status otherwise.  */
 329
 330 static int
 331 net_wait (pEvent)
 332     RDB_EVENT *pEvent;
 333 {
 334     int pid;
 335     enum clnt_stat status;
 336
 337     memset ((char *) pEvent, '\0', sizeof (RDB_EVENT));
 338
 339     pid = inferior_pid;
 340     status = net_clnt_call (PROCESS_WAIT, xdr_int, &pid, xdr_RDB_EVENT, pEvent);
 341
 342     return (status == RPC_SUCCESS)? pEvent->status: -1;
 343 }
 344
 345 /* Suspend the remote task.
 346    Returns -1 if suspend fails on target system, 0 otherwise.  */
 347
 348 static int
 349 net_quit ()
 350 {
 351     int pid;
 352     int quit_status;
 353     enum clnt_stat status;
 354
 355     quit_status = 0;
 356
 357     /* don't let rdbTask suspend itself by passing a pid of 0 */
 358
 359     if ((pid = inferior_pid) == 0)
 360         return -1;
 361
 362     status = net_clnt_call (VX_TASK_SUSPEND, xdr_int, &pid, xdr_int,
 363                             &quit_status);
 364
 365     return (status == RPC_SUCCESS)? quit_status: -1;
 366 }
 367
 368 /* Read a register or registers from the remote system.  */
 369
 370 static void
 371 vx_read_register (regno)
 372      int regno;
 373 {
 374   int status;
 375   Rptrace ptrace_in;
 376   Ptrace_return ptrace_out;
 377   C_bytes in_data;
 378   C_bytes out_data;
 379   extern char registers[];
 380
 381   memset ((char *) &ptrace_in, '\0', sizeof (ptrace_in));
 382   memset ((char *) &ptrace_out, '\0', sizeof (ptrace_out));
 383
 384   /* FIXME, eventually only get the ones we need.  */
 385   registers_fetched ();
 386
 387   ptrace_in.pid = inferior_pid;
 388   ptrace_out.info.more_data = (caddr_t) &out_data;
 389   out_data.len   = VX_NUM_REGS * REGISTER_RAW_SIZE (0);
 390   out_data.bytes = (caddr_t) registers;
 391
 392   status = net_ptrace_clnt_call (PTRACE_GETREGS, &ptrace_in, &ptrace_out);
 393   if (status)
 394     error (rpcerr);
 395   if (ptrace_out.status == -1)
 396     {
 397       errno = ptrace_out.errno;
 398       perror_with_name ("net_ptrace_clnt_call(PTRACE_GETREGS)");
 399     }
 400
 401 #ifdef VX_SIZE_FPREGS
 402     /* If the target has floating point registers, fetch them.
 403        Otherwise, zero the floating point register values in
 404        registers[] for good measure, even though we might not
 405        need to.  */
 406
 407   if (target_has_fp)
 408     {
 409       ptrace_in.pid = inferior_pid;
 410       ptrace_out.info.more_data = (caddr_t) &out_data;
 411       out_data.len   =  VX_SIZE_FPREGS;
 412       out_data.bytes = (caddr_t) &registers[REGISTER_BYTE (FP0_REGNUM)];
 413
 414       status = net_ptrace_clnt_call (PTRACE_GETFPREGS, &ptrace_in, &ptrace_out);
 415       if (status)
 416         error (rpcerr);
 417       if (ptrace_out.status == -1)
 418         {
 419           errno = ptrace_out.errno;
 420           perror_with_name ("net_ptrace_clnt_call(PTRACE_GETFPREGS)");
 421         }
 422     }
 423   else
 424     {
 425       memset (&registers[REGISTER_BYTE (FP0_REGNUM)], '\0', VX_SIZE_FPREGS);
 426     }
 427 #endif /* VX_SIZE_FPREGS */
 428 }
 429
 430 /* Prepare to store registers.  Since we will store all of them,
 431    read out their current values now.  */
 432
 433 static void
 434 vx_prepare_to_store ()
 435 {
 436   /* Fetch all registers, if any of them are not yet fetched.  */
 437   read_register_bytes (0, NULL, REGISTER_BYTES);
 438 }
 439
 440
 441 /* Store our register values back into the inferior.
 442    If REGNO is -1, do this for all registers.
 443    Otherwise, REGNO specifies which register (so we can save time).  */
 444    /* FIXME, look at REGNO to save time here */
 445
 446 static void
 447 vx_write_register (regno)
 448      int regno;
 449 {
 450   C_bytes in_data;
 451   C_bytes out_data;
 452   extern char registers[];
 453   int status;
 454   Rptrace ptrace_in;
 455   Ptrace_return ptrace_out;
 456
 457   memset ((char *) &ptrace_in, '\0', sizeof (ptrace_in));
 458   memset ((char *) &ptrace_out, '\0', sizeof (ptrace_out));
 459
 460   ptrace_in.pid = inferior_pid;
 461   ptrace_in.info.ttype     = DATA;
 462   ptrace_in.info.more_data = (caddr_t) &in_data;
 463
 464   in_data.bytes = registers;
 465
 466   in_data.len = VX_NUM_REGS * sizeof (REGISTER_TYPE);
 467
 468   /* XXX change second param to be a proc number */
 469   status = net_ptrace_clnt_call (PTRACE_SETREGS, &ptrace_in, &ptrace_out);
 470   if (status)
 471       error (rpcerr);
 472   if (ptrace_out.status == -1)
 473     {
 474       errno = ptrace_out.errno;
 475       perror_with_name ("net_ptrace_clnt_call(PTRACE_SETREGS)");
 476     }
 477
 478 #ifdef VX_SIZE_FPREGS
 479   /* Store floating point registers if the target has them.  */
 480
 481   if (target_has_fp)
 482     {
 483       ptrace_in.pid = inferior_pid;
 484       ptrace_in.info.ttype     = DATA;
 485       ptrace_in.info.more_data = (caddr_t) &in_data;
 486
 487
 488       in_data.bytes = &registers[REGISTER_BYTE (FP0_REGNUM)];
 489       in_data.len = VX_SIZE_FPREGS;
 490
 491       status = net_ptrace_clnt_call (PTRACE_SETFPREGS, &ptrace_in, &ptrace_out);
 492       if (status)
 493           error (rpcerr);
 494       if (ptrace_out.status == -1)
 495         {
 496           errno = ptrace_out.errno;
 497           perror_with_name ("net_ptrace_clnt_call(PTRACE_SETFPREGS)");
 498         }
 499     }
 500 #endif  /* VX_SIZE_FPREGS */
 501 }
 502
 503 /* Copy LEN bytes to or from remote inferior's memory starting at MEMADDR
 504    to debugger memory starting at MYADDR.  WRITE is true if writing to the
 505    inferior.
 506    Result is the number of bytes written or read (zero if error).  The
 507    protocol allows us to return a negative count, indicating that we can't
 508    handle the current address but can handle one N bytes further, but
 509    vxworks doesn't give us that information.  */
 510
 511 static int
 512 vx_xfer_memory (memaddr, myaddr, len, write, target)
 513      CORE_ADDR memaddr;
 514      char *myaddr;
 515      int len;
 516      int write;
 517      struct target_ops *target;                 /* ignored */
 518 {
 519   int status;
 520   Rptrace ptrace_in;
 521   Ptrace_return ptrace_out;
 522   C_bytes data;
 523
 524   memset ((char *) &ptrace_in, '\0', sizeof (ptrace_in));
 525   memset ((char *) &ptrace_out, '\0', sizeof (ptrace_out));
 526
 527   ptrace_in.pid = inferior_pid;         /* XXX pid unnecessary for READDATA */
 528   ptrace_in.addr = (int) memaddr;       /* Where from */
 529   ptrace_in.data = len;                 /* How many bytes */
 530
 531   if (write)
 532     {
 533       ptrace_in.info.ttype     = DATA;
 534       ptrace_in.info.more_data = (caddr_t) &data;
 535
 536       data.bytes = (caddr_t) myaddr;    /* Where from */
 537       data.len   = len;                 /* How many bytes (again, for XDR) */
 538
 539       /* XXX change second param to be a proc number */
 540       status = net_ptrace_clnt_call (PTRACE_WRITEDATA, &ptrace_in, &ptrace_out);
 541     }
 542   else
 543     {
 544       ptrace_out.info.more_data = (caddr_t) &data;
 545       data.bytes = myaddr;              /* Where to */
 546       data.len   = len;                 /* How many (again, for XDR) */
 547
 548       /* XXX change second param to be a proc number */
 549       status = net_ptrace_clnt_call (PTRACE_READDATA, &ptrace_in, &ptrace_out);
 550     }
 551
 552   if (status)
 553       error (rpcerr);
 554   if (ptrace_out.status == -1)
 555     {
 556       return 0;         /* No bytes moved */
 557     }
 558   return len;           /* Moved *all* the bytes */
 559 }
 560
 561 static void
 562 vx_files_info ()
 563 {
 564   printf ("\tAttached to host `%s'", vx_host);
 565   printf (", which has %sfloating point", target_has_fp? "": "no ");
 566   printf (".\n");
 567 }
 568
 569 static void
 570 vx_run_files_info ()
 571 {
 572   printf ("\tRunning %s VxWorks process %s",
 573           vx_running? "child": "attached",
 574           local_hex_string((unsigned long) inferior_pid));
 575   if (vx_running)
 576     printf (", function `%s'", vx_running);
 577   printf(".\n");
 578 }
 579
 580 static void
 581 vx_resume (pid, step, siggnal)
 582      int pid;
 583      int step;
 584      int siggnal;
 585 {
 586   int status;
 587   Rptrace ptrace_in;
 588   Ptrace_return ptrace_out;
 589
 590   if (siggnal != 0 && siggnal != stop_signal)
 591     error ("Cannot send signals to VxWorks processes");
 592
 593   memset ((char *) &ptrace_in, '\0', sizeof (ptrace_in));
 594   memset ((char *) &ptrace_out, '\0', sizeof (ptrace_out));
 595
 596   ptrace_in.pid = pid;
 597   ptrace_in.addr = 1;   /* Target side insists on this, or it panics.  */
 598
 599   /* XXX change second param to be a proc number */
 600   status = net_ptrace_clnt_call (step? PTRACE_SINGLESTEP: PTRACE_CONT,
 601                                  &ptrace_in, &ptrace_out);
 602   if (status)
 603       error (rpcerr);
 604   if (ptrace_out.status == -1)
 605     {
 606       errno = ptrace_out.errno;
 607       perror_with_name ("Resuming remote process");
 608     }
 609 }
 610
 611 static void
 612 vx_mourn_inferior ()
 613 {
 614   pop_target ();                /* Pop back to no-child state */
 615   generic_mourn_inferior ();
 616 }
 617
 618 \f
 619 /* This function allows the addition of incrementally linked object files.  */
 620
 621 static void
 622 vx_load_command (arg_string, from_tty)
 623      char* arg_string;
 624      int from_tty;
 625 {
 626   CORE_ADDR text_addr;
 627   CORE_ADDR data_addr;
 628   CORE_ADDR bss_addr;
 629
 630   if (arg_string == 0)
 631     error ("The load command takes a file name");
 632
 633   arg_string = tilde_expand (arg_string);
 634   make_cleanup (free, arg_string);
 635
 636   dont_repeat ();
 637
 638   QUIT;
 639   immediate_quit++;
 640   if (net_load (arg_string, &text_addr, &data_addr, &bss_addr) == -1)
 641     error ("Load failed on target machine");
 642   immediate_quit--;
 643
 644   /* FIXME, for now we ignore data_addr and bss_addr.  */
 645   symbol_file_add (arg_string, from_tty, text_addr, 0, 0, 0);
 646 }
 647
 648 #ifdef FIXME  /* Not ready for prime time */
 649 /* Single step the target program at the source or machine level.
 650    Takes an error exit if rpc fails.
 651    Returns -1 if remote single-step operation fails, else 0.  */
 652
 653 static int
 654 net_step ()
 655 {
 656   enum clnt_stat status;
 657   int step_status;
 658   SOURCE_STEP source_step;
 659
 660   source_step.taskId = inferior_pid;
 661
 662   if (step_range_end)
 663     {
 664       source_step.startAddr = step_range_start;
 665       source_step.endAddr = step_range_end;
 666     }
 667   else
 668     {
 669       source_step.startAddr = 0;
 670       source_step.endAddr = 0;
 671     }
 672
 673   status = net_clnt_call (VX_SOURCE_STEP, xdr_SOURCE_STEP, &source_step,
 674                           xdr_int, &step_status);
 675
 676   if (status == RPC_SUCCESS)
 677     return step_status;
 678   else
 679     error (rpcerr);
 680 }
 681 #endif
 682
 683 /* Emulate ptrace using RPC calls to the VxWorks target system.
 684    Returns nonzero (-1) if RPC status to VxWorks is bad, 0 otherwise.  */
 685
 686 static int
 687 net_ptrace_clnt_call (request, pPtraceIn, pPtraceOut)
 688     enum ptracereq request;
 689     Rptrace *pPtraceIn;
 690     Ptrace_return *pPtraceOut;
 691 {
 692   enum clnt_stat status;
 693
 694   status = net_clnt_call (request, xdr_rptrace, pPtraceIn, xdr_ptrace_return,
 695                           pPtraceOut);
 696
 697   if (status != RPC_SUCCESS)
 698       return -1;
 699
 700   return 0;
 701 }
 702
 703 /* Query the target for the name of the file from which VxWorks was
 704    booted.  pBootFile is the address of a pointer to the buffer to
 705    receive the file name; if the pointer pointed to by pBootFile is
 706    NULL, memory for the buffer will be allocated by XDR.
 707    Returns -1 if rpc failed, 0 otherwise.  */
 708
 709 static int
 710 net_get_boot_file (pBootFile)
 711      char **pBootFile;
 712 {
 713   enum clnt_stat status;
 714
 715   status = net_clnt_call (VX_BOOT_FILE_INQ, xdr_void, (char *) 0,
 716                           xdr_wrapstring, pBootFile);
 717   return (status == RPC_SUCCESS) ? 0 : -1;
 718 }
 719
 720 /* Fetch a list of loaded object modules from the VxWorks target.
 721    Returns -1 if rpc failed, 0 otherwise
 722    There's no way to check if the returned loadTable is correct.
 723    VxWorks doesn't check it.  */
 724
 725 static int
 726 net_get_symbols (pLoadTable)
 727      ldtabl *pLoadTable;                /* return pointer to ldtabl here */
 728 {
 729   enum clnt_stat status;
 730
 731   memset ((char *) pLoadTable, '\0', sizeof (struct ldtabl));
 732
 733   status = net_clnt_call (VX_STATE_INQ, xdr_void, 0, xdr_ldtabl, pLoadTable);
 734   return (status == RPC_SUCCESS) ? 0 : -1;
 735 }
 736
 737 /* Look up a symbol in the VxWorks target's symbol table.
 738    Returns status of symbol read on target side (0=success, -1=fail)
 739    Returns -1 and complain()s if rpc fails.  */
 740
 741 struct complaint cant_contact_target =
 742   {"Lost contact with VxWorks target", 0, 0};
 743
 744 static int
 745 vx_lookup_symbol (name, pAddr)
 746      char *name;                /* symbol name */
 747      CORE_ADDR *pAddr;
 748 {
 749   enum clnt_stat status;
 750   SYMBOL_ADDR symbolAddr;
 751
 752   *pAddr = 0;
 753   memset ((char *) &symbolAddr, '\0', sizeof (symbolAddr));
 754
 755   status = net_clnt_call (VX_SYMBOL_INQ, xdr_wrapstring, &name,
 756                           xdr_SYMBOL_ADDR, &symbolAddr);
 757   if (status != RPC_SUCCESS) {
 758       complain (&cant_contact_target);
 759       return -1;
 760   }
 761
 762   *pAddr = symbolAddr.addr;
 763   return symbolAddr.status;
 764 }
 765
 766 /* Check to see if the VxWorks target has a floating point coprocessor.
 767    Returns 1 if target has floating point processor, 0 otherwise.
 768    Calls error() if rpc fails.  */
 769
 770 static int
 771 net_check_for_fp ()
 772 {
 773   enum clnt_stat status;
 774   bool_t fp = 0;        /* true if fp processor is present on target board */
 775
 776   status = net_clnt_call (VX_FP_INQUIRE, xdr_void, 0, xdr_bool, &fp);
 777   if (status != RPC_SUCCESS)
 778       error (rpcerr);
 779
 780    return (int) fp;
 781 }
 782
 783 /* Establish an RPC connection with the VxWorks target system.
 784    Calls error () if unable to establish connection.  */
 785
 786 static void
 787 net_connect (host)
 788      char *host;
 789 {
 790   struct sockaddr_in destAddr;
 791   struct hostent *destHost;
 792   unsigned long addr;
 793
 794   /* Get the internet address for the given host.  Allow a numeric
 795      IP address or a hostname.  */
 796
 797   addr = inet_addr (host);
 798   if (addr == -1)
 799     {
 800       destHost = (struct hostent *) gethostbyname (host);
 801       if (destHost == NULL)
 802         error ("Invalid hostname.  Couldn't find remote host address.");
 803       addr = * (unsigned long *) destHost->h_addr;
 804     }
 805
 806   memset (&destAddr, '\0', sizeof (destAddr));
 807
 808   destAddr.sin_addr.s_addr = addr;
 809   destAddr.sin_family      = AF_INET;
 810   destAddr.sin_port        = 0; /* set to actual port that remote
 811                                    ptrace is listening on.  */
 812
 813   /* Create a tcp client transport on which to issue
 814      calls to the remote ptrace server.  */
 815
 816   ptraceSock = RPC_ANYSOCK;
 817   pClient = clnttcp_create (&destAddr, RDBPROG, RDBVERS, &ptraceSock, 0, 0);
 818   /* FIXME, here is where we deal with different version numbers of the proto */
 819
 820   if (pClient == NULL)
 821     {
 822       clnt_pcreateerror ("\tnet_connect");
 823       error ("Couldn't connect to remote target.");
 824     }
 825 }
 826 \f
 827 /* Sleep for the specified number of milliseconds
 828  * (assumed to be less than 1000).
 829  * If select () is interrupted, returns immediately;
 830  * takes an error exit if select () fails for some other reason.
 831  */
 832
 833 static void
 834 sleep_ms (ms)
 835      long ms;
 836 {
 837   struct timeval select_timeout;
 838   int status;
 839
 840   select_timeout.tv_sec = 0;
 841   select_timeout.tv_usec = ms * 1000;
 842
 843   status = select (0, (fd_set *) 0, (fd_set *) 0, (fd_set *) 0, &select_timeout);
 844
 845   if (status < 0 && errno != EINTR)
 846     perror_with_name ("select");
 847 }
 848
 849 /* Wait for control to return from inferior to debugger.
 850    If inferior gets a signal, we may decide to start it up again
 851    instead of returning.  That is why there is a loop in this function.
 852    When this function actually returns it means the inferior
 853    should be left stopped and GDB should read more commands.  */
 854
 855 /* For network debugging with VxWorks.
 856  * VxWorks knows when tasks hit breakpoints, receive signals, exit, etc,
 857  * so vx_wait() receives this information directly from
 858  * VxWorks instead of trying to figure out what happenned via a wait() call.
 859  */
 860
 861 static int
 862 vx_wait (status)
 863      int *status;
 864 {
 865   register int pid;
 866   WAITTYPE w;
 867   RDB_EVENT rdbEvent;
 868   int quit_failed;
 869
 870   do
 871     {
 872       /* If CTRL-C is hit during this loop,
 873          suspend the inferior process.  */
 874
 875       quit_failed = 0;
 876       if (quit_flag)
 877         {
 878           quit_failed = (net_quit () == -1);
 879           quit_flag = 0;
 880         }
 881
 882       /* If a net_quit () or net_wait () call has failed,
 883          allow the user to break the connection with the target.
 884          We can't simply error () out of this loop, since the
 885          data structures representing the state of the inferior
 886          are in an inconsistent state.  */
 887
 888       if (quit_failed || net_wait (&rdbEvent) == -1)
 889         {
 890           terminal_ours ();
 891           if (query ("Can't %s.  Disconnect from target system? ",
 892                      (quit_failed) ? "suspend remote task"
 893                                    : "get status of remote task"))
 894             {
 895               target_mourn_inferior();
 896               error ("Use the \"target\" command to reconnect.");
 897             }
 898           else
 899             {
 900               terminal_inferior ();
 901               continue;
 902             }
 903         }
 904
 905       pid = rdbEvent.taskId;
 906       if (pid == 0)
 907         {
 908           sleep_ms (200);       /* FIXME Don't kill the network too badly */
 909         }
 910       else if (pid != inferior_pid)
 911         fatal ("Bad pid for debugged task: %s\n",
 912                local_hex_string((unsigned long) pid));
 913     } while (pid == 0);
 914
 915   /* FIXME, eventually do more then SIGTRAP on everything...  */
 916   switch (rdbEvent.eventType)
 917     {
 918     case EVENT_EXIT:
 919       WSETEXIT (w, 0);
 920       /* FIXME is it possible to distinguish between a
 921          XXX   normal vs abnormal exit in VxWorks? */
 922       break;
 923
 924     case EVENT_START:           /* Task was just started. */
 925       WSETSTOP (w, SIGTRAP);
 926       break;
 927
 928     case EVENT_STOP:
 929       WSETSTOP (w, SIGTRAP);
 930       /* XXX was it stopped by a signal?  act accordingly */
 931       break;
 932
 933     case EVENT_BREAK:           /* Breakpoint was hit. */
 934       WSETSTOP (w, SIGTRAP);
 935       break;
 936
 937     case EVENT_SUSPEND:         /* Task was suspended, probably by ^C. */
 938       WSETSTOP (w, SIGINT);
 939       break;
 940
 941     case EVENT_BUS_ERR:         /* Task made evil nasty reference. */
 942       WSETSTOP (w, SIGBUS);
 943       break;
 944
 945     case EVENT_ZERO_DIV:        /* Division by zero */
 946       WSETSTOP (w, SIGFPE);     /* Like Unix, call it a float exception. */
 947       break;
 948
 949     case EVENT_SIGNAL:
 950       /* The target is not running Unix, and its
 951          faults/traces do not map nicely into Unix signals.
 952          Make sure they do not get confused with Unix signals
 953          by numbering them with values higher than the highest
 954          legal Unix signal.  code in the arch-dependent PRINT_RANDOM_SIGNAL
 955          routine will interpret the value for wait_for_inferior.  */
 956       WSETSTOP (w, rdbEvent.sigType + NSIG);
 957       break;
 958     } /* switch */
 959   *status = *(int *)&w;         /* Grumble union wait crap Grumble */
 960   return pid;
 961 }
 962 \f
 963 static int
 964 symbol_stub (arg)
 965      char *arg;
 966 {
 967   symbol_file_command (arg, 0);
 968   return 1;
 969 }
 970
 971 static int
 972 add_symbol_stub (arg)
 973      char *arg;
 974 {
 975   struct ldfile *pLoadFile = (struct ldfile *)arg;
 976
 977   printf("\t%s: ", pLoadFile->name);
 978   symbol_file_add (pLoadFile->name, 0, pLoadFile->txt_addr, 0, 0, 0);
 979   printf ("ok\n");
 980   return 1;
 981 }
 982 /* Target command for VxWorks target systems.
 983
 984    Used in vxgdb.  Takes the name of a remote target machine
 985    running vxWorks and connects to it to initialize remote network
 986    debugging.  */
 987
 988 static void
 989 vx_open (args, from_tty)
 990      char *args;
 991      int from_tty;
 992 {
 993   extern int close ();
 994   char *bootFile;
 995   extern char *source_path;
 996   struct ldtabl loadTable;
 997   struct ldfile *pLoadFile;
 998   int i;
 999   extern CLIENT *pClient;
1000
1001   if (!args)
1002     error_no_arg ("target machine name");
1003
1004   target_preopen (from_tty);
1005
1006   unpush_target (&vx_ops);
1007   printf ("Attaching remote machine across net...\n");
1008   fflush (stdout);
1009
1010   /* Allow the user to kill the connect attempt by typing ^C.
1011      Wait until the call to target_has_fp () completes before
1012      disallowing an immediate quit, since even if net_connect ()
1013      is successful, the remote debug server might be hung.  */
1014
1015   immediate_quit++;
1016
1017   net_connect (args);
1018   target_has_fp = net_check_for_fp ();
1019   printf_filtered ("Connected to %s.\n", args);
1020
1021   immediate_quit--;
1022
1023   push_target (&vx_ops);
1024
1025   /* Save a copy of the target host's name.  */
1026   vx_host = savestring (args, strlen (args));
1027
1028   /* Find out the name of the file from which the target was booted
1029      and load its symbol table.  */
1030
1031   printf_filtered ("Looking in Unix path for all loaded modules:\n");
1032   bootFile = NULL;
1033   if (!net_get_boot_file (&bootFile))
1034     {
1035       if (*bootFile) {
1036         printf_filtered ("\t%s: ", bootFile);
1037         if (catch_errors
1038             (symbol_stub, bootFile,
1039              "Error while reading symbols from boot file:\n", RETURN_MASK_ALL))
1040           puts_filtered ("ok\n");
1041       } else if (from_tty)
1042         printf ("VxWorks kernel symbols not loaded.\n");
1043     }
1044   else
1045     error ("Can't retrieve boot file name from target machine.");
1046
1047   clnt_freeres (pClient, xdr_wrapstring, &bootFile);
1048
1049   if (net_get_symbols (&loadTable) != 0)
1050     error ("Can't read loaded modules from target machine");
1051
1052   i = 0-1;
1053   while (++i < loadTable.tbl_size)
1054     {
1055       QUIT;     /* FIXME, avoids clnt_freeres below:  mem leak */
1056       pLoadFile = &loadTable.tbl_ent [i];
1057 #ifdef WRS_ORIG
1058   {
1059     register int desc;
1060     struct cleanup *old_chain;
1061     char *fullname = NULL;
1062
1063     desc = openp (source_path, 0, pLoadFile->name, O_RDONLY, 0, &fullname);
1064     if (desc < 0)
1065         perror_with_name (pLoadFile->name);
1066     old_chain = make_cleanup (close, desc);
1067     add_file_at_addr (fullname, desc, pLoadFile->txt_addr, pLoadFile->data_addr,
1068                       pLoadFile->bss_addr);
1069     do_cleanups (old_chain);
1070   }
1071 #else
1072       /* Botches, FIXME:
1073          (1)  Searches the PATH, not the source path.
1074          (2)  data and bss are assumed to be at the usual offsets from text.  */
1075       catch_errors (add_symbol_stub, (char *)pLoadFile, (char *)0,
1076                     RETURN_MASK_ALL);
1077 #endif
1078     }
1079   printf_filtered ("Done.\n");
1080
1081   clnt_freeres (pClient, xdr_ldtabl, &loadTable);
1082 }
1083 \f
1084 /* Takes a task started up outside of gdb and ``attaches'' to it.
1085    This stops it cold in its tracks and allows us to start tracing it.  */
1086
1087 static void
1088 vx_attach (args, from_tty)
1089      char *args;
1090      int from_tty;
1091 {
1092   int pid;
1093   char *cptr = 0;
1094   Rptrace ptrace_in;
1095   Ptrace_return ptrace_out;
1096   int status;
1097
1098   if (!args)
1099     error_no_arg ("process-id to attach");
1100
1101   pid = strtol (args, &cptr, 0);
1102   if ((cptr == args) || (*cptr != '\0'))
1103     error ("Invalid process-id -- give a single number in decimal or 0xhex");
1104
1105   if (from_tty)
1106       printf ("Attaching pid %s.\n",
1107               local_hex_string((unsigned long) pid));
1108
1109   memset ((char *)&ptrace_in,  '\0', sizeof (ptrace_in));
1110   memset ((char *)&ptrace_out, '\0', sizeof (ptrace_out));
1111   ptrace_in.pid = pid;
1112
1113   status = net_ptrace_clnt_call (PTRACE_ATTACH, &ptrace_in, &ptrace_out);
1114   if (status == -1)
1115     error (rpcerr);
1116   if (ptrace_out.status == -1)
1117     {
1118       errno = ptrace_out.errno;
1119       perror_with_name ("Attaching remote process");
1120     }
1121
1122   /* It worked... */
1123   push_target (&vx_run_ops);
1124   inferior_pid = pid;
1125   vx_running = 0;
1126 }
1127
1128
1129 /* detach_command --
1130    takes a program previously attached to and detaches it.
1131    The program resumes execution and will no longer stop
1132    on signals, etc.  We better not have left any breakpoints
1133    in the program or it'll die when it hits one.  For this
1134    to work, it may be necessary for the process to have been
1135    previously attached.  It *might* work if the program was
1136    started via the normal ptrace (PTRACE_TRACEME).  */
1137
1138 static void
1139 vx_detach (args, from_tty)
1140      char *args;
1141      int from_tty;
1142 {
1143   Rptrace ptrace_in;
1144   Ptrace_return ptrace_out;
1145   int signal = 0;
1146   int status;
1147
1148   if (args)
1149     error ("Argument given to VxWorks \"detach\".");
1150
1151   if (from_tty)
1152       printf ("Detaching pid %s.\n",
1153               local_hex_string((unsigned long) inferior_pid));
1154
1155   if (args)             /* FIXME, should be possible to leave suspended */
1156     signal = atoi (args);
1157
1158   memset ((char *)&ptrace_in,  '\0', sizeof (ptrace_in));
1159   memset ((char *)&ptrace_out, '\0', sizeof (ptrace_out));
1160   ptrace_in.pid = inferior_pid;
1161
1162   status = net_ptrace_clnt_call (PTRACE_DETACH, &ptrace_in, &ptrace_out);
1163   if (status == -1)
1164     error (rpcerr);
1165   if (ptrace_out.status == -1)
1166     {
1167       errno = ptrace_out.errno;
1168       perror_with_name ("Detaching VxWorks process");
1169     }
1170
1171   inferior_pid = 0;
1172   pop_target ();        /* go back to non-executing VxWorks connection */
1173 }
1174
1175 /* vx_kill -- takes a running task and wipes it out.  */
1176
1177 static void
1178 vx_kill ()
1179 {
1180   Rptrace ptrace_in;
1181   Ptrace_return ptrace_out;
1182   int status;
1183
1184   printf ("Killing pid %s.\n", local_hex_string((unsigned long) inferior_pid));
1185
1186   memset ((char *)&ptrace_in,  '\0', sizeof (ptrace_in));
1187   memset ((char *)&ptrace_out, '\0', sizeof (ptrace_out));
1188   ptrace_in.pid = inferior_pid;
1189
1190   status = net_ptrace_clnt_call (PTRACE_KILL, &ptrace_in, &ptrace_out);
1191   if (status == -1)
1192     warning (rpcerr);
1193   else if (ptrace_out.status == -1)
1194     {
1195       errno = ptrace_out.errno;
1196       perror_with_name ("Killing VxWorks process");
1197     }
1198
1199   /* If it gives good status, the process is *gone*, no events remain.
1200      If the kill failed, assume the process is gone anyhow.  */
1201   inferior_pid = 0;
1202   pop_target ();        /* go back to non-executing VxWorks connection */
1203 }
1204
1205 /* Clean up from the VxWorks process target as it goes away.  */
1206
1207 static void
1208 vx_proc_close (quitting)
1209      int quitting;
1210 {
1211   inferior_pid = 0;             /* No longer have a process.  */
1212   if (vx_running)
1213     free (vx_running);
1214   vx_running = 0;
1215 }
1216 \f
1217 /* Make an RPC call to the VxWorks target.
1218    Returns RPC status.  */
1219
1220 static enum clnt_stat
1221 net_clnt_call (procNum, inProc, in, outProc, out)
1222     enum ptracereq procNum;
1223     xdrproc_t inProc;
1224     char *in;
1225     xdrproc_t outProc;
1226     char *out;
1227 {
1228   enum clnt_stat status;
1229
1230   status = clnt_call (pClient, procNum, inProc, in, outProc, out, rpcTimeout);
1231
1232   if (status != RPC_SUCCESS)
1233       clnt_perrno (status);
1234
1235   return status;
1236 }
1237
1238 /* Clean up before losing control.  */
1239
1240 static void
1241 vx_close (quitting)
1242      int quitting;
1243 {
1244   if (pClient)
1245     clnt_destroy (pClient);     /* The net connection */
1246   pClient = 0;
1247
1248   if (vx_host)
1249     free (vx_host);             /* The hostname */
1250   vx_host = 0;
1251 }
1252
1253 /* A vxprocess target should be started via "run" not "target".  */
1254 /*ARGSUSED*/
1255 static void
1256 vx_proc_open (name, from_tty)
1257      char *name;
1258      int from_tty;
1259 {
1260   error ("Use the \"run\" command to start a VxWorks process.");
1261 }
1262
1263 /* Target ops structure for accessing memory and such over the net */
1264
1265 struct target_ops vx_ops = {
1266         "vxworks", "VxWorks target memory via RPC over TCP/IP",
1267         "Use VxWorks target memory.  \n\
1268 Specify the name of the machine to connect to.",
1269         vx_open, vx_close, vx_attach, 0, /* vx_detach, */
1270         0, 0, /* resume, wait */
1271         0, 0, /* read_reg, write_reg */
1272         0, /* prep_to_store, */
1273         vx_xfer_memory, vx_files_info,
1274         0, 0, /* insert_breakpoint, remove_breakpoint */
1275         0, 0, 0, 0, 0,  /* terminal stuff */
1276         0, /* vx_kill, */
1277         vx_load_command,
1278         vx_lookup_symbol,
1279         vx_create_inferior, 0,  /* mourn_inferior */
1280         0, /* can_run */
1281         0, /* notice_signals */
1282         core_stratum, 0, /* next */
1283         1, 1, 0, 0, 0,  /* all mem, mem, stack, regs, exec */
1284         0, 0,                   /* Section pointers */
1285         OPS_MAGIC,              /* Always the last thing */
1286 };
1287
1288 /* Target ops structure for accessing VxWorks child processes over the net */
1289
1290 struct target_ops vx_run_ops = {
1291         "vxprocess", "VxWorks process",
1292         "VxWorks process, started by the \"run\" command.",
1293         vx_proc_open, vx_proc_close, 0, vx_detach, /* vx_attach */
1294         vx_resume, vx_wait,
1295         vx_read_register, vx_write_register,
1296         vx_prepare_to_store,
1297         vx_xfer_memory, vx_run_files_info,
1298         vx_insert_breakpoint, vx_remove_breakpoint,
1299         0, 0, 0, 0, 0,  /* terminal stuff */
1300         vx_kill,
1301         vx_load_command,
1302         vx_lookup_symbol,
1303         0, vx_mourn_inferior,
1304         0,  /* can_run */
1305         0, /* notice_signals */
1306         process_stratum, 0, /* next */
1307         0, 1, 1, 1, 1,  /* all mem, mem, stack, regs, exec */
1308                         /* all_mem is off to avoid spurious msg in "i files" */
1309         0, 0,                   /* Section pointers */
1310         OPS_MAGIC,              /* Always the last thing */
1311 };
1312 /* ==> Remember when reading at end of file, there are two "ops" structs here. */
1313 \f
1314 void
1315 _initialize_vx ()
1316 {
1317
1318  add_show_from_set
1319     (add_set_cmd ("vxworks-timeout", class_support, var_uinteger,
1320                   (char *) &rpcTimeout.tv_sec,
1321                   "Set seconds to wait for rpc calls to return.\n\
1322 Set the number of seconds to wait for rpc calls to return.", &setlist),
1323      &showlist);
1324
1325    add_target (&vx_ops);
1326   add_target (&vx_run_ops);
1327 }