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   push_target (&vx_run_ops);
 219   inferior_pid = taskStart.pid;
 220
 221   /* We will get a trace trap after one instruction.
 222      Insert breakpoints and continue.  */
 223
 224   init_wait_for_inferior ();
 225
 226   /* Set up the "saved terminal modes" of the inferior
 227      based on what modes we are starting it with.  */
 228   target_terminal_init ();
 229
 230   /* Install inferior's terminal modes.  */
 231   target_terminal_inferior ();
 232
 233   stop_soon_quietly = 1;
 234   wait_for_inferior ();         /* Get the task spawn event */
 235   stop_soon_quietly = 0;
 236
 237   /* insert_step_breakpoint ();  FIXME, do we need this?  */
 238   proceed(-1, -1, 0);
 239 }
 240
 241 /* Fill ARGSTRUCT in argc/argv form with the arguments from the
 242    argument string ARGSTRING.  */
 243
 244 static void
 245 parse_args (arg_string, arg_struct)
 246      register char *arg_string;
 247      arg_array *arg_struct;
 248 {
 249   register int arg_count = 0;   /* number of arguments */
 250   register int arg_index = 0;
 251   register char *p0;
 252
 253   memset ((char *) arg_struct, '\0', sizeof (arg_array));
 254
 255   /* first count how many arguments there are */
 256
 257   p0 = arg_string;
 258   while (*p0 != '\0')
 259     {
 260       if (*(p0 = skip_white_space (p0)) == '\0')
 261         break;
 262       p0 = find_white_space (p0);
 263       arg_count++;
 264     }
 265
 266   arg_struct->arg_array_len = arg_count;
 267   arg_struct->arg_array_val = (char **) xmalloc ((arg_count + 1)
 268                                                  * sizeof (char *));
 269
 270   /* now copy argument strings into arg_struct.  */
 271
 272   while (*(arg_string = skip_white_space (arg_string)))
 273     {
 274       p0 = find_white_space (arg_string);
 275       arg_struct->arg_array_val[arg_index++] = savestring (arg_string,
 276                                                            p0 - arg_string);
 277       arg_string = p0;
 278     }
 279
 280   arg_struct->arg_array_val[arg_count] = NULL;
 281 }
 282
 283 /* Advance a string pointer across whitespace and return a pointer
 284    to the first non-white character.  */
 285
 286 static char *
 287 skip_white_space (p)
 288      register char *p;
 289 {
 290   while (*p == ' ' || *p == '\t')
 291     p++;
 292   return p;
 293 }
 294
 295 /* Search for the first unquoted whitespace character in a string.
 296    Returns a pointer to the character, or to the null terminator
 297    if no whitespace is found.  */
 298
 299 static char *
 300 find_white_space (p)
 301      register char *p;
 302 {
 303   register int c;
 304
 305   while ((c = *p) != ' ' && c != '\t' && c)
 306     {
 307       if (c == '\'' || c == '"')
 308         {
 309           while (*++p != c && *p)
 310             {
 311               if (*p == '\\')
 312                 p++;
 313             }
 314           if (!*p)
 315             break;
 316         }
 317       p++;
 318     }
 319   return p;
 320 }
 321
 322 /* Poll the VxWorks target system for an event related
 323    to the debugged task.
 324    Returns -1 if remote wait failed, task status otherwise.  */
 325
 326 static int
 327 net_wait (pEvent)
 328     RDB_EVENT *pEvent;
 329 {
 330     int pid;
 331     enum clnt_stat status;
 332
 333     memset ((char *) pEvent, '\0', sizeof (RDB_EVENT));
 334
 335     pid = inferior_pid;
 336     status = net_clnt_call (PROCESS_WAIT, xdr_int, &pid, xdr_RDB_EVENT, pEvent);
 337
 338     return (status == RPC_SUCCESS)? pEvent->status: -1;
 339 }
 340
 341 /* Suspend the remote task.
 342    Returns -1 if suspend fails on target system, 0 otherwise.  */
 343
 344 static int
 345 net_quit ()
 346 {
 347     int pid;
 348     int quit_status;
 349     enum clnt_stat status;
 350
 351     quit_status = 0;
 352
 353     /* don't let rdbTask suspend itself by passing a pid of 0 */
 354
 355     if ((pid = inferior_pid) == 0)
 356         return -1;
 357
 358     status = net_clnt_call (VX_TASK_SUSPEND, xdr_int, &pid, xdr_int,
 359                             &quit_status);
 360
 361     return (status == RPC_SUCCESS)? quit_status: -1;
 362 }
 363
 364 /* Read a register or registers from the remote system.  */
 365
 366 static void
 367 vx_read_register (regno)
 368      int regno;
 369 {
 370   int status;
 371   Rptrace ptrace_in;
 372   Ptrace_return ptrace_out;
 373   C_bytes in_data;
 374   C_bytes out_data;
 375   extern char registers[];
 376
 377   memset ((char *) &ptrace_in, '\0', sizeof (ptrace_in));
 378   memset ((char *) &ptrace_out, '\0', sizeof (ptrace_out));
 379
 380   /* FIXME, eventually only get the ones we need.  */
 381   registers_fetched ();
 382
 383   ptrace_in.pid = inferior_pid;
 384   ptrace_out.info.more_data = (caddr_t) &out_data;
 385   out_data.len   = VX_NUM_REGS * REGISTER_RAW_SIZE (0);
 386   out_data.bytes = (caddr_t) registers;
 387
 388   status = net_ptrace_clnt_call (PTRACE_GETREGS, &ptrace_in, &ptrace_out);
 389   if (status)
 390     error (rpcerr);
 391   if (ptrace_out.status == -1)
 392     {
 393       errno = ptrace_out.errno;
 394       perror_with_name ("net_ptrace_clnt_call(PTRACE_GETREGS)");
 395     }
 396
 397 #ifdef VX_SIZE_FPREGS
 398     /* If the target has floating point registers, fetch them.
 399        Otherwise, zero the floating point register values in
 400        registers[] for good measure, even though we might not
 401        need to.  */
 402
 403   if (target_has_fp)
 404     {
 405       ptrace_in.pid = inferior_pid;
 406       ptrace_out.info.more_data = (caddr_t) &out_data;
 407       out_data.len   =  VX_SIZE_FPREGS;
 408       out_data.bytes = (caddr_t) &registers[REGISTER_BYTE (FP0_REGNUM)];
 409
 410       status = net_ptrace_clnt_call (PTRACE_GETFPREGS, &ptrace_in, &ptrace_out);
 411       if (status)
 412         error (rpcerr);
 413       if (ptrace_out.status == -1)
 414         {
 415           errno = ptrace_out.errno;
 416           perror_with_name ("net_ptrace_clnt_call(PTRACE_GETFPREGS)");
 417         }
 418     }
 419   else
 420     {
 421       memset (&registers[REGISTER_BYTE (FP0_REGNUM)], '\0', VX_SIZE_FPREGS);
 422     }
 423 #endif /* VX_SIZE_FPREGS */
 424 }
 425
 426 /* Prepare to store registers.  Since we will store all of them,
 427    read out their current values now.  */
 428
 429 static void
 430 vx_prepare_to_store ()
 431 {
 432   /* Fetch all registers, if any of them are not yet fetched.  */
 433   read_register_bytes (0, NULL, REGISTER_BYTES);
 434 }
 435
 436
 437 /* Store our register values back into the inferior.
 438    If REGNO is -1, do this for all registers.
 439    Otherwise, REGNO specifies which register (so we can save time).  */
 440    /* FIXME, look at REGNO to save time here */
 441
 442 static void
 443 vx_write_register (regno)
 444      int regno;
 445 {
 446   C_bytes in_data;
 447   C_bytes out_data;
 448   extern char registers[];
 449   int status;
 450   Rptrace ptrace_in;
 451   Ptrace_return ptrace_out;
 452
 453   memset ((char *) &ptrace_in, '\0', sizeof (ptrace_in));
 454   memset ((char *) &ptrace_out, '\0', sizeof (ptrace_out));
 455
 456   ptrace_in.pid = inferior_pid;
 457   ptrace_in.info.ttype     = DATA;
 458   ptrace_in.info.more_data = (caddr_t) &in_data;
 459
 460   in_data.bytes = registers;
 461
 462   in_data.len = VX_NUM_REGS * sizeof (REGISTER_TYPE);
 463
 464   /* XXX change second param to be a proc number */
 465   status = net_ptrace_clnt_call (PTRACE_SETREGS, &ptrace_in, &ptrace_out);
 466   if (status)
 467       error (rpcerr);
 468   if (ptrace_out.status == -1)
 469     {
 470       errno = ptrace_out.errno;
 471       perror_with_name ("net_ptrace_clnt_call(PTRACE_SETREGS)");
 472     }
 473
 474 #ifdef VX_SIZE_FPREGS
 475   /* Store floating point registers if the target has them.  */
 476
 477   if (target_has_fp)
 478     {
 479       ptrace_in.pid = inferior_pid;
 480       ptrace_in.info.ttype     = DATA;
 481       ptrace_in.info.more_data = (caddr_t) &in_data;
 482
 483
 484       in_data.bytes = &registers[REGISTER_BYTE (FP0_REGNUM)];
 485       in_data.len = VX_SIZE_FPREGS;
 486
 487       status = net_ptrace_clnt_call (PTRACE_SETFPREGS, &ptrace_in, &ptrace_out);
 488       if (status)
 489           error (rpcerr);
 490       if (ptrace_out.status == -1)
 491         {
 492           errno = ptrace_out.errno;
 493           perror_with_name ("net_ptrace_clnt_call(PTRACE_SETFPREGS)");
 494         }
 495     }
 496 #endif  /* VX_SIZE_FPREGS */
 497 }
 498
 499 /* Copy LEN bytes to or from remote inferior's memory starting at MEMADDR
 500    to debugger memory starting at MYADDR.  WRITE is true if writing to the
 501    inferior.
 502    Result is the number of bytes written or read (zero if error).  The
 503    protocol allows us to return a negative count, indicating that we can't
 504    handle the current address but can handle one N bytes further, but
 505    vxworks doesn't give us that information.  */
 506
 507 static int
 508 vx_xfer_memory (memaddr, myaddr, len, write, target)
 509      CORE_ADDR memaddr;
 510      char *myaddr;
 511      int len;
 512      int write;
 513      struct target_ops *target;                 /* ignored */
 514 {
 515   int status;
 516   Rptrace ptrace_in;
 517   Ptrace_return ptrace_out;
 518   C_bytes data;
 519
 520   memset ((char *) &ptrace_in, '\0', sizeof (ptrace_in));
 521   memset ((char *) &ptrace_out, '\0', sizeof (ptrace_out));
 522
 523   ptrace_in.pid = inferior_pid;         /* XXX pid unnecessary for READDATA */
 524   ptrace_in.addr = (int) memaddr;       /* Where from */
 525   ptrace_in.data = len;                 /* How many bytes */
 526
 527   if (write)
 528     {
 529       ptrace_in.info.ttype     = DATA;
 530       ptrace_in.info.more_data = (caddr_t) &data;
 531
 532       data.bytes = (caddr_t) myaddr;    /* Where from */
 533       data.len   = len;                 /* How many bytes (again, for XDR) */
 534
 535       /* XXX change second param to be a proc number */
 536       status = net_ptrace_clnt_call (PTRACE_WRITEDATA, &ptrace_in, &ptrace_out);
 537     }
 538   else
 539     {
 540       ptrace_out.info.more_data = (caddr_t) &data;
 541       data.bytes = myaddr;              /* Where to */
 542       data.len   = len;                 /* How many (again, for XDR) */
 543
 544       /* XXX change second param to be a proc number */
 545       status = net_ptrace_clnt_call (PTRACE_READDATA, &ptrace_in, &ptrace_out);
 546     }
 547
 548   if (status)
 549       error (rpcerr);
 550   if (ptrace_out.status == -1)
 551     {
 552       return 0;         /* No bytes moved */
 553     }
 554   return len;           /* Moved *all* the bytes */
 555 }
 556
 557 static void
 558 vx_files_info ()
 559 {
 560   printf_unfiltered ("\tAttached to host `%s'", vx_host);
 561   printf_unfiltered (", which has %sfloating point", target_has_fp? "": "no ");
 562   printf_unfiltered (".\n");
 563 }
 564
 565 static void
 566 vx_run_files_info ()
 567 {
 568   printf_unfiltered ("\tRunning %s VxWorks process %s",
 569           vx_running? "child": "attached",
 570           local_hex_string((unsigned long) inferior_pid));
 571   if (vx_running)
 572     printf_unfiltered (", function `%s'", vx_running);
 573   printf_unfiltered(".\n");
 574 }
 575
 576 static void
 577 vx_resume (pid, step, siggnal)
 578      int pid;
 579      int step;
 580      int siggnal;
 581 {
 582   int status;
 583   Rptrace ptrace_in;
 584   Ptrace_return ptrace_out;
 585
 586   if (pid == -1)
 587     pid = inferior_pid;
 588
 589   if (siggnal != 0 && siggnal != stop_signal)
 590     error ("Cannot send signals to VxWorks processes");
 591
 592   memset ((char *) &ptrace_in, '\0', sizeof (ptrace_in));
 593   memset ((char *) &ptrace_out, '\0', sizeof (ptrace_out));
 594
 595   ptrace_in.pid = pid;
 596   ptrace_in.addr = 1;   /* Target side insists on this, or it panics.  */
 597
 598   /* XXX change second param to be a proc number */
 599   status = net_ptrace_clnt_call (step? PTRACE_SINGLESTEP: PTRACE_CONT,
 600                                  &ptrace_in, &ptrace_out);
 601   if (status)
 602       error (rpcerr);
 603   if (ptrace_out.status == -1)
 604     {
 605       errno = ptrace_out.errno;
 606       perror_with_name ("Resuming remote process");
 607     }
 608 }
 609
 610 static void
 611 vx_mourn_inferior ()
 612 {
 613   pop_target ();                /* Pop back to no-child state */
 614   generic_mourn_inferior ();
 615 }
 616
 617 \f
 618 /* This function allows the addition of incrementally linked object files.  */
 619
 620 static void
 621 vx_load_command (arg_string, from_tty)
 622      char* arg_string;
 623      int from_tty;
 624 {
 625   CORE_ADDR text_addr;
 626   CORE_ADDR data_addr;
 627   CORE_ADDR bss_addr;
 628
 629   if (arg_string == 0)
 630     error ("The load command takes a file name");
 631
 632   arg_string = tilde_expand (arg_string);
 633   make_cleanup (free, arg_string);
 634
 635   dont_repeat ();
 636
 637   QUIT;
 638   immediate_quit++;
 639   if (net_load (arg_string, &text_addr, &data_addr, &bss_addr) == -1)
 640     error ("Load failed on target machine");
 641   immediate_quit--;
 642
 643   /* FIXME, for now we ignore data_addr and bss_addr.  */
 644   symbol_file_add (arg_string, from_tty, text_addr, 0, 0, 0);
 645 }
 646
 647 #ifdef FIXME  /* Not ready for prime time */
 648 /* Single step the target program at the source or machine level.
 649    Takes an error exit if rpc fails.
 650    Returns -1 if remote single-step operation fails, else 0.  */
 651
 652 static int
 653 net_step ()
 654 {
 655   enum clnt_stat status;
 656   int step_status;
 657   SOURCE_STEP source_step;
 658
 659   source_step.taskId = inferior_pid;
 660
 661   if (step_range_end)
 662     {
 663       source_step.startAddr = step_range_start;
 664       source_step.endAddr = step_range_end;
 665     }
 666   else
 667     {
 668       source_step.startAddr = 0;
 669       source_step.endAddr = 0;
 670     }
 671
 672   status = net_clnt_call (VX_SOURCE_STEP, xdr_SOURCE_STEP, &source_step,
 673                           xdr_int, &step_status);
 674
 675   if (status == RPC_SUCCESS)
 676     return step_status;
 677   else
 678     error (rpcerr);
 679 }
 680 #endif
 681
 682 /* Emulate ptrace using RPC calls to the VxWorks target system.
 683    Returns nonzero (-1) if RPC status to VxWorks is bad, 0 otherwise.  */
 684
 685 static int
 686 net_ptrace_clnt_call (request, pPtraceIn, pPtraceOut)
 687     enum ptracereq request;
 688     Rptrace *pPtraceIn;
 689     Ptrace_return *pPtraceOut;
 690 {
 691   enum clnt_stat status;
 692
 693   status = net_clnt_call (request, xdr_rptrace, pPtraceIn, xdr_ptrace_return,
 694                           pPtraceOut);
 695
 696   if (status != RPC_SUCCESS)
 697       return -1;
 698
 699   return 0;
 700 }
 701
 702 /* Query the target for the name of the file from which VxWorks was
 703    booted.  pBootFile is the address of a pointer to the buffer to
 704    receive the file name; if the pointer pointed to by pBootFile is
 705    NULL, memory for the buffer will be allocated by XDR.
 706    Returns -1 if rpc failed, 0 otherwise.  */
 707
 708 static int
 709 net_get_boot_file (pBootFile)
 710      char **pBootFile;
 711 {
 712   enum clnt_stat status;
 713
 714   status = net_clnt_call (VX_BOOT_FILE_INQ, xdr_void, (char *) 0,
 715                           xdr_wrapstring, pBootFile);
 716   return (status == RPC_SUCCESS) ? 0 : -1;
 717 }
 718
 719 /* Fetch a list of loaded object modules from the VxWorks target.
 720    Returns -1 if rpc failed, 0 otherwise
 721    There's no way to check if the returned loadTable is correct.
 722    VxWorks doesn't check it.  */
 723
 724 static int
 725 net_get_symbols (pLoadTable)
 726      ldtabl *pLoadTable;                /* return pointer to ldtabl here */
 727 {
 728   enum clnt_stat status;
 729
 730   memset ((char *) pLoadTable, '\0', sizeof (struct ldtabl));
 731
 732   status = net_clnt_call (VX_STATE_INQ, xdr_void, 0, xdr_ldtabl, pLoadTable);
 733   return (status == RPC_SUCCESS) ? 0 : -1;
 734 }
 735
 736 /* Look up a symbol in the VxWorks target's symbol table.
 737    Returns status of symbol read on target side (0=success, -1=fail)
 738    Returns -1 and complain()s if rpc fails.  */
 739
 740 struct complaint cant_contact_target =
 741   {"Lost contact with VxWorks target", 0, 0};
 742
 743 static int
 744 vx_lookup_symbol (name, pAddr)
 745      char *name;                /* symbol name */
 746      CORE_ADDR *pAddr;
 747 {
 748   enum clnt_stat status;
 749   SYMBOL_ADDR symbolAddr;
 750
 751   *pAddr = 0;
 752   memset ((char *) &symbolAddr, '\0', sizeof (symbolAddr));
 753
 754   status = net_clnt_call (VX_SYMBOL_INQ, xdr_wrapstring, &name,
 755                           xdr_SYMBOL_ADDR, &symbolAddr);
 756   if (status != RPC_SUCCESS) {
 757       complain (&cant_contact_target);
 758       return -1;
 759   }
 760
 761   *pAddr = symbolAddr.addr;
 762   return symbolAddr.status;
 763 }
 764
 765 /* Check to see if the VxWorks target has a floating point coprocessor.
 766    Returns 1 if target has floating point processor, 0 otherwise.
 767    Calls error() if rpc fails.  */
 768
 769 static int
 770 net_check_for_fp ()
 771 {
 772   enum clnt_stat status;
 773   bool_t fp = 0;        /* true if fp processor is present on target board */
 774
 775   status = net_clnt_call (VX_FP_INQUIRE, xdr_void, 0, xdr_bool, &fp);
 776   if (status != RPC_SUCCESS)
 777       error (rpcerr);
 778
 779    return (int) fp;
 780 }
 781
 782 /* Establish an RPC connection with the VxWorks target system.
 783    Calls error () if unable to establish connection.  */
 784
 785 static void
 786 net_connect (host)
 787      char *host;
 788 {
 789   struct sockaddr_in destAddr;
 790   struct hostent *destHost;
 791   unsigned long addr;
 792
 793   /* Get the internet address for the given host.  Allow a numeric
 794      IP address or a hostname.  */
 795
 796   addr = inet_addr (host);
 797   if (addr == -1)
 798     {
 799       destHost = (struct hostent *) gethostbyname (host);
 800       if (destHost == NULL)
 801         error ("Invalid hostname.  Couldn't find remote host address.");
 802       addr = * (unsigned long *) destHost->h_addr;
 803     }
 804
 805   memset (&destAddr, '\0', sizeof (destAddr));
 806
 807   destAddr.sin_addr.s_addr = addr;
 808   destAddr.sin_family      = AF_INET;
 809   destAddr.sin_port        = 0; /* set to actual port that remote
 810                                    ptrace is listening on.  */
 811
 812   /* Create a tcp client transport on which to issue
 813      calls to the remote ptrace server.  */
 814
 815   ptraceSock = RPC_ANYSOCK;
 816   pClient = clnttcp_create (&destAddr, RDBPROG, RDBVERS, &ptraceSock, 0, 0);
 817   /* FIXME, here is where we deal with different version numbers of the proto */
 818
 819   if (pClient == NULL)
 820     {
 821       clnt_pcreateerror ("\tnet_connect");
 822       error ("Couldn't connect to remote target.");
 823     }
 824 }
 825 \f
 826 /* Sleep for the specified number of milliseconds
 827  * (assumed to be less than 1000).
 828  * If select () is interrupted, returns immediately;
 829  * takes an error exit if select () fails for some other reason.
 830  */
 831
 832 static void
 833 sleep_ms (ms)
 834      long ms;
 835 {
 836   struct timeval select_timeout;
 837   int status;
 838
 839   select_timeout.tv_sec = 0;
 840   select_timeout.tv_usec = ms * 1000;
 841
 842   status = select (0, (fd_set *) 0, (fd_set *) 0, (fd_set *) 0, &select_timeout);
 843
 844   if (status < 0 && errno != EINTR)
 845     perror_with_name ("select");
 846 }
 847
 848 /* Wait for control to return from inferior to debugger.
 849    If inferior gets a signal, we may decide to start it up again
 850    instead of returning.  That is why there is a loop in this function.
 851    When this function actually returns it means the inferior
 852    should be left stopped and GDB should read more commands.  */
 853
 854 /* For network debugging with VxWorks.
 855  * VxWorks knows when tasks hit breakpoints, receive signals, exit, etc,
 856  * so vx_wait() receives this information directly from
 857  * VxWorks instead of trying to figure out what happenned via a wait() call.
 858  */
 859
 860 static int
 861 vx_wait (pid_to_wait_for, status)
 862      int pid_to_wait_for;
 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_unfiltered("\t%s: ", pLoadFile->name);
 978   symbol_file_add (pLoadFile->name, 0, pLoadFile->txt_addr, 0, 0, 0);
 979   printf_unfiltered ("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_unfiltered ("Attaching remote machine across net...\n");
1008   gdb_flush (gdb_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_unfiltered ("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_unfiltered ("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_unfiltered ("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_unfiltered ("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 }