gdb/win32-nat.c

   1 /* Target-vector operations for controlling win32 child processes, for GDB.
   2    Copyright 1995, 1996, 1997, 1998 Free Software Foundation, Inc.
   3    Contributed by 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 eve nthe 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20 */
  21
  22 /* by Steve Chamberlain, sac@cygnus.com */
  23
  24 /* We assume we're being built with and will be used for cygwin32.  */
  25
  26 #include "defs.h"
  27 #include "frame.h"              /* required by inferior.h */
  28 #include "inferior.h"
  29 #include "target.h"
  30 #include "wait.h"
  31 #include "gdbcore.h"
  32 #include "command.h"
  33 #include <signal.h>
  34 #include <sys/types.h>
  35 #include <fcntl.h>
  36 #include <stdlib.h>
  37
  38 #ifdef _MSC_VER
  39 #include "windefs.h"
  40 #else /* other WIN32 compiler */
  41 #include <windows.h>
  42 #endif
  43
  44 #include "buildsym.h"
  45 #include "symfile.h"
  46 #include "objfiles.h"
  47 #include "gdb_string.h"
  48 #include "gdbthread.h"
  49 #include "gdbcmd.h"
  50 #include <sys/param.h>
  51 #include <unistd.h>
  52
  53 #define CHECK(x)        check (x, __FILE__,__LINE__)
  54 #define DEBUG_EXEC(x)   if (debug_exec)         printf x
  55 #define DEBUG_EVENTS(x) if (debug_events)       printf x
  56 #define DEBUG_MEM(x)    if (debug_memory)       printf x
  57 #define DEBUG_EXCEPT(x) if (debug_exceptions)   printf x
  58
  59 /* Forward declaration */
  60 extern struct target_ops child_ops;
  61
  62 static void child_stop PARAMS ((void));
  63
  64 /* The most recently read context. Inspect ContextFlags to see what
  65    bits are valid. */
  66
  67 static CONTEXT context;
  68
  69 /* The process and thread handles for the above context. */
  70
  71 static HANDLE current_process;
  72 static HANDLE current_thread;
  73 static int current_process_id;
  74 static int current_thread_id;
  75
  76 /* Counts of things. */
  77 static int exception_count = 0;
  78 static int event_count = 0;
  79
  80 /* User options. */
  81 static int new_console = 0;
  82 static int new_group = 0;
  83 static int debug_exec = 0;              /* show execution */
  84 static int debug_events = 0;            /* show events from kernel */
  85 static int debug_memory = 0;            /* show target memory accesses */
  86 static int debug_exceptions = 0;        /* show target exceptions */
  87
  88 /* This vector maps GDB's idea of a register's number into an address
  89    in the win32 exception context vector.
  90
  91    It also contains the bit mask needed to load the register in question.
  92
  93    One day we could read a reg, we could inspect the context we
  94    already have loaded, if it doesn't have the bit set that we need,
  95    we read that set of registers in using GetThreadContext.  If the
  96    context already contains what we need, we just unpack it. Then to
  97    write a register, first we have to ensure that the context contains
  98    the other regs of the group, and then we copy the info in and set
  99    out bit. */
 100
 101 struct regmappings
 102   {
 103     char *incontext;
 104     int mask;
 105   };
 106
 107 static const struct regmappings  mappings[] =
 108 {
 109 #ifdef __PPC__
 110   {(char *) &context.Gpr0, CONTEXT_INTEGER},
 111   {(char *) &context.Gpr1, CONTEXT_INTEGER},
 112   {(char *) &context.Gpr2, CONTEXT_INTEGER},
 113   {(char *) &context.Gpr3, CONTEXT_INTEGER},
 114   {(char *) &context.Gpr4, CONTEXT_INTEGER},
 115   {(char *) &context.Gpr5, CONTEXT_INTEGER},
 116   {(char *) &context.Gpr6, CONTEXT_INTEGER},
 117   {(char *) &context.Gpr7, CONTEXT_INTEGER},
 118
 119   {(char *) &context.Gpr8, CONTEXT_INTEGER},
 120   {(char *) &context.Gpr9, CONTEXT_INTEGER},
 121   {(char *) &context.Gpr10, CONTEXT_INTEGER},
 122   {(char *) &context.Gpr11, CONTEXT_INTEGER},
 123   {(char *) &context.Gpr12, CONTEXT_INTEGER},
 124   {(char *) &context.Gpr13, CONTEXT_INTEGER},
 125   {(char *) &context.Gpr14, CONTEXT_INTEGER},
 126   {(char *) &context.Gpr15, CONTEXT_INTEGER},
 127
 128   {(char *) &context.Gpr16, CONTEXT_INTEGER},
 129   {(char *) &context.Gpr17, CONTEXT_INTEGER},
 130   {(char *) &context.Gpr18, CONTEXT_INTEGER},
 131   {(char *) &context.Gpr19, CONTEXT_INTEGER},
 132   {(char *) &context.Gpr20, CONTEXT_INTEGER},
 133   {(char *) &context.Gpr21, CONTEXT_INTEGER},
 134   {(char *) &context.Gpr22, CONTEXT_INTEGER},
 135   {(char *) &context.Gpr23, CONTEXT_INTEGER},
 136
 137   {(char *) &context.Gpr24, CONTEXT_INTEGER},
 138   {(char *) &context.Gpr25, CONTEXT_INTEGER},
 139   {(char *) &context.Gpr26, CONTEXT_INTEGER},
 140   {(char *) &context.Gpr27, CONTEXT_INTEGER},
 141   {(char *) &context.Gpr28, CONTEXT_INTEGER},
 142   {(char *) &context.Gpr29, CONTEXT_INTEGER},
 143   {(char *) &context.Gpr30, CONTEXT_INTEGER},
 144   {(char *) &context.Gpr31, CONTEXT_INTEGER},
 145
 146   {(char *) &context.Fpr0, CONTEXT_FLOATING_POINT},
 147   {(char *) &context.Fpr1, CONTEXT_FLOATING_POINT},
 148   {(char *) &context.Fpr2, CONTEXT_FLOATING_POINT},
 149   {(char *) &context.Fpr3, CONTEXT_FLOATING_POINT},
 150   {(char *) &context.Fpr4, CONTEXT_FLOATING_POINT},
 151   {(char *) &context.Fpr5, CONTEXT_FLOATING_POINT},
 152   {(char *) &context.Fpr6, CONTEXT_FLOATING_POINT},
 153   {(char *) &context.Fpr7, CONTEXT_FLOATING_POINT},
 154
 155   {(char *) &context.Fpr8, CONTEXT_FLOATING_POINT},
 156   {(char *) &context.Fpr9, CONTEXT_FLOATING_POINT},
 157   {(char *) &context.Fpr10, CONTEXT_FLOATING_POINT},
 158   {(char *) &context.Fpr11, CONTEXT_FLOATING_POINT},
 159   {(char *) &context.Fpr12, CONTEXT_FLOATING_POINT},
 160   {(char *) &context.Fpr13, CONTEXT_FLOATING_POINT},
 161   {(char *) &context.Fpr14, CONTEXT_FLOATING_POINT},
 162   {(char *) &context.Fpr15, CONTEXT_FLOATING_POINT},
 163
 164   {(char *) &context.Fpr16, CONTEXT_FLOATING_POINT},
 165   {(char *) &context.Fpr17, CONTEXT_FLOATING_POINT},
 166   {(char *) &context.Fpr18, CONTEXT_FLOATING_POINT},
 167   {(char *) &context.Fpr19, CONTEXT_FLOATING_POINT},
 168   {(char *) &context.Fpr20, CONTEXT_FLOATING_POINT},
 169   {(char *) &context.Fpr21, CONTEXT_FLOATING_POINT},
 170   {(char *) &context.Fpr22, CONTEXT_FLOATING_POINT},
 171   {(char *) &context.Fpr23, CONTEXT_FLOATING_POINT},
 172
 173   {(char *) &context.Fpr24, CONTEXT_FLOATING_POINT},
 174   {(char *) &context.Fpr25, CONTEXT_FLOATING_POINT},
 175   {(char *) &context.Fpr26, CONTEXT_FLOATING_POINT},
 176   {(char *) &context.Fpr27, CONTEXT_FLOATING_POINT},
 177   {(char *) &context.Fpr28, CONTEXT_FLOATING_POINT},
 178   {(char *) &context.Fpr29, CONTEXT_FLOATING_POINT},
 179   {(char *) &context.Fpr30, CONTEXT_FLOATING_POINT},
 180   {(char *) &context.Fpr31, CONTEXT_FLOATING_POINT},
 181
 182   {(char *) &context.Iar, CONTEXT_CONTROL},
 183   {(char *) &context.Msr, CONTEXT_CONTROL},
 184   {(char *) &context.Cr,  CONTEXT_INTEGER},
 185   {(char *) &context.Lr,  CONTEXT_CONTROL},
 186   {(char *) &context.Ctr, CONTEXT_CONTROL},
 187
 188   {(char *) &context.Xer, CONTEXT_INTEGER},
 189   {0,0}, /* MQ, but there isn't one */
 190 #else
 191   {(char *) &context.Eax, CONTEXT_INTEGER},
 192   {(char *) &context.Ecx, CONTEXT_INTEGER},
 193   {(char *) &context.Edx, CONTEXT_INTEGER},
 194   {(char *) &context.Ebx, CONTEXT_INTEGER},
 195   {(char *) &context.Esp, CONTEXT_CONTROL},
 196   {(char *) &context.Ebp, CONTEXT_CONTROL},
 197   {(char *) &context.Esi, CONTEXT_INTEGER},
 198   {(char *) &context.Edi, CONTEXT_INTEGER},
 199   {(char *) &context.Eip, CONTEXT_CONTROL},
 200   {(char *) &context.EFlags, CONTEXT_CONTROL},
 201   {(char *) &context.SegCs, CONTEXT_SEGMENTS},
 202   {(char *) &context.SegSs, CONTEXT_SEGMENTS},
 203   {(char *) &context.SegDs, CONTEXT_SEGMENTS},
 204   {(char *) &context.SegEs, CONTEXT_SEGMENTS},
 205   {(char *) &context.SegFs, CONTEXT_SEGMENTS},
 206   {(char *) &context.SegGs, CONTEXT_SEGMENTS},
 207   {&context.FloatSave.RegisterArea[0 * 10], CONTEXT_FLOATING_POINT},
 208   {&context.FloatSave.RegisterArea[1 * 10], CONTEXT_FLOATING_POINT},
 209   {&context.FloatSave.RegisterArea[2 * 10], CONTEXT_FLOATING_POINT},
 210   {&context.FloatSave.RegisterArea[3 * 10], CONTEXT_FLOATING_POINT},
 211   {&context.FloatSave.RegisterArea[4 * 10], CONTEXT_FLOATING_POINT},
 212   {&context.FloatSave.RegisterArea[5 * 10], CONTEXT_FLOATING_POINT},
 213   {&context.FloatSave.RegisterArea[6 * 10], CONTEXT_FLOATING_POINT},
 214   {&context.FloatSave.RegisterArea[7 * 10], CONTEXT_FLOATING_POINT},
 215 #endif
 216 };
 217
 218 /* This vector maps the target's idea of an exception (extracted
 219    from the DEBUG_EVENT structure) to GDB's idea. */
 220
 221 struct xlate_exception
 222   {
 223     int them;
 224     enum target_signal us;
 225   };
 226
 227 static const struct xlate_exception
 228   xlate[] =
 229 {
 230   {EXCEPTION_ACCESS_VIOLATION, TARGET_SIGNAL_SEGV},
 231   {STATUS_STACK_OVERFLOW, TARGET_SIGNAL_SEGV},
 232   {EXCEPTION_BREAKPOINT, TARGET_SIGNAL_TRAP},
 233   {DBG_CONTROL_C, TARGET_SIGNAL_INT},
 234   {EXCEPTION_SINGLE_STEP, TARGET_SIGNAL_TRAP},
 235   {-1, -1}};
 236
 237 static void
 238 check (BOOL ok, const char *file, int line)
 239 {
 240   if (!ok)
 241     printf_filtered ("error return %s:%d was %d\n", file, line, GetLastError ());
 242 }
 243
 244 static void
 245 child_fetch_inferior_registers (int r)
 246 {
 247   if (r < 0)
 248     {
 249       for (r = 0; r < NUM_REGS; r++)
 250         child_fetch_inferior_registers (r);
 251     }
 252   else
 253     {
 254       supply_register (r, mappings[r].incontext);
 255     }
 256 }
 257
 258 static void
 259 child_store_inferior_registers (int r)
 260 {
 261   if (r < 0)
 262     {
 263       for (r = 0; r < NUM_REGS; r++)
 264         child_store_inferior_registers (r);
 265     }
 266   else
 267     {
 268       read_register_gen (r, mappings[r].incontext);
 269     }
 270 }
 271
 272
 273 /* Wait for child to do something.  Return pid of child, or -1 in case
 274    of error; store status through argument pointer OURSTATUS.  */
 275
 276 static int
 277 handle_load_dll (char *eventp)
 278 {
 279   DEBUG_EVENT * event = (DEBUG_EVENT *)eventp;
 280   DWORD dll_name_ptr;
 281   DWORD done;
 282
 283   ReadProcessMemory (current_process,
 284                      (DWORD) event->u.LoadDll.lpImageName,
 285                      (char *) &dll_name_ptr,
 286                      sizeof (dll_name_ptr), &done);
 287
 288   /* See if we could read the address of a string, and that the
 289      address isn't null. */
 290
 291   if (done == sizeof (dll_name_ptr) && dll_name_ptr)
 292     {
 293       char *dll_name, *dll_basename;
 294       struct objfile *objfile;
 295       char unix_dll_name[MAX_PATH];
 296       int size = event->u.LoadDll.fUnicode ? sizeof (WCHAR) : sizeof (char);
 297       int len = 0;
 298       char b[2];
 299       do
 300         {
 301           ReadProcessMemory (current_process,
 302                              dll_name_ptr + len * size,
 303                              &b,
 304                              size,
 305                              &done);
 306           len++;
 307         }
 308       while ((b[0] != 0 || b[size - 1] != 0) && done == size);
 309
 310       dll_name = alloca (len);
 311
 312       if (event->u.LoadDll.fUnicode)
 313         {
 314           WCHAR *unicode_dll_name = (WCHAR *) alloca (len * sizeof (WCHAR));
 315           ReadProcessMemory (current_process,
 316                              dll_name_ptr,
 317                              unicode_dll_name,
 318                              len * sizeof (WCHAR),
 319                              &done);
 320
 321           WideCharToMultiByte (CP_ACP, 0,
 322                                unicode_dll_name, len,
 323                                dll_name, len, 0, 0);
 324         }
 325       else
 326         {
 327           ReadProcessMemory (current_process,
 328                              dll_name_ptr,
 329                              dll_name,
 330                              len,
 331                              &done);
 332         }
 333
 334       /* FIXME: Can we delete this call?  */
 335       cygwin32_conv_to_posix_path (dll_name, unix_dll_name);
 336
 337       /* FIXME!! It would be nice to define one symbol which pointed to the
 338          front of the dll if we can't find any symbols. */
 339
 340        if (!(dll_basename = strrchr(dll_name, '\\')))
 341         dll_basename = strrchr(dll_name, '/');
 342
 343        ALL_OBJFILES(objfile)
 344         {
 345           char *objfile_basename;
 346           if (!(objfile_basename = strrchr(objfile->name, '\\')))
 347             objfile_basename = strrchr(objfile->name, '/');
 348
 349           if (dll_basename && objfile_basename &&
 350               strcmp(dll_basename+1, objfile_basename+1) == 0)
 351             {
 352               printf_unfiltered ("%s (symbols previously loaded)\n",
 353                                  dll_basename + 1);
 354               return 1;
 355             }
 356         }
 357
 358       context.ContextFlags = CONTEXT_FULL | CONTEXT_FLOATING_POINT;
 359       GetThreadContext (current_thread, &context);
 360
 361       /* The symbols in a dll are offset by 0x1000, which is the
 362          the offset from 0 of the first byte in an image - because
 363          of the file header and the section alignment.
 364
 365          FIXME: Is this the real reason that we need the 0x1000 ? */
 366
 367
 368       symbol_file_add (unix_dll_name, 0,
 369                        (int) event->u.LoadDll.lpBaseOfDll + 0x1000, 0, 0, 0);
 370
 371       printf_unfiltered ("%x:%s\n", event->u.LoadDll.lpBaseOfDll,
 372                          unix_dll_name);
 373     }
 374   return 1;
 375 }
 376
 377
 378 static int
 379 handle_exception (DEBUG_EVENT * event, struct target_waitstatus *ourstatus)
 380 {
 381   int i;
 382   int done = 0;
 383   ourstatus->kind = TARGET_WAITKIND_STOPPED;
 384
 385
 386   switch (event->u.Exception.ExceptionRecord.ExceptionCode)
 387     {
 388     case EXCEPTION_ACCESS_VIOLATION:
 389       DEBUG_EXCEPT (("gdb: Target exception ACCESS_VIOLATION at 0x%08x\n",
 390                      event->u.Exception.ExceptionRecord.ExceptionAddress));
 391       ourstatus->value.sig = TARGET_SIGNAL_SEGV;
 392       break;
 393     case STATUS_STACK_OVERFLOW:
 394       DEBUG_EXCEPT (("gdb: Target exception STACK_OVERFLOW at 0x%08x\n",
 395                      event->u.Exception.ExceptionRecord.ExceptionAddress));
 396       ourstatus->value.sig = TARGET_SIGNAL_SEGV;
 397       break;
 398     case EXCEPTION_BREAKPOINT:
 399       DEBUG_EXCEPT (("gdb: Target exception BREAKPOINT at 0x%08x\n",
 400                      event->u.Exception.ExceptionRecord.ExceptionAddress));
 401       ourstatus->value.sig = TARGET_SIGNAL_TRAP;
 402       break;
 403     case DBG_CONTROL_C:
 404       DEBUG_EXCEPT (("gdb: Target exception CONTROL_C at 0x%08x\n",
 405                      event->u.Exception.ExceptionRecord.ExceptionAddress));
 406       ourstatus->value.sig = TARGET_SIGNAL_INT;
 407       break;
 408     case EXCEPTION_SINGLE_STEP:
 409       DEBUG_EXCEPT (("gdb: Target exception SINGLE_STEP at 0x%08x\n",
 410                      event->u.Exception.ExceptionRecord.ExceptionAddress));
 411       ourstatus->value.sig = TARGET_SIGNAL_TRAP;
 412       break;
 413     default:
 414       /* This may be a structured exception handling exception.  In
 415          that case, we want to let the program try to handle it, and
 416          only break if we see the exception a second time.  */
 417       if (event->u.Exception.dwFirstChance)
 418         return 0;
 419
 420       printf_unfiltered ("gdb: unknown target exception 0x%08x at 0x%08x\n",
 421                          event->u.Exception.ExceptionRecord.ExceptionCode,
 422                          event->u.Exception.ExceptionRecord.ExceptionAddress);
 423       ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
 424       break;
 425     }
 426   context.ContextFlags = CONTEXT_FULL | CONTEXT_FLOATING_POINT;
 427   GetThreadContext (current_thread, &context);
 428   exception_count++;
 429   return 1;
 430 }
 431
 432 static int
 433 child_wait (int pid, struct target_waitstatus *ourstatus)
 434 {
 435   /* We loop when we get a non-standard exception rather than return
 436      with a SPURIOUS because resume can try and step or modify things,
 437      which needs a current_thread.  But some of these exceptions mark
 438      the birth or death of threads, which mean that the current thread
 439      isn't necessarily what you think it is. */
 440
 441   while (1)
 442     {
 443       DEBUG_EVENT event;
 444       BOOL t = WaitForDebugEvent (&event, INFINITE);
 445       char *p;
 446       DWORD continue_status;
 447
 448       event_count++;
 449
 450       current_thread_id = event.dwThreadId;
 451       current_process_id = event.dwProcessId;
 452
 453       continue_status = DBG_CONTINUE;
 454
 455       switch (event.dwDebugEventCode)
 456         {
 457         case CREATE_THREAD_DEBUG_EVENT:
 458           DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
 459                         event.dwProcessId, event.dwThreadId,
 460                         "CREATE_THREAD_DEBUG_EVENT"));
 461           break;
 462         case EXIT_THREAD_DEBUG_EVENT:
 463           DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
 464                         event.dwProcessId, event.dwThreadId,
 465                         "EXIT_THREAD_DEBUG_EVENT"));
 466           break;
 467         case CREATE_PROCESS_DEBUG_EVENT:
 468           DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
 469                         event.dwProcessId, event.dwThreadId,
 470                         "CREATE_PROCESS_DEBUG_EVENT"));
 471           break;
 472
 473         case EXIT_PROCESS_DEBUG_EVENT:
 474           DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
 475                         event.dwProcessId, event.dwThreadId,
 476                         "EXIT_PROCESS_DEBUG_EVENT"));
 477           ourstatus->kind = TARGET_WAITKIND_EXITED;
 478           ourstatus->value.integer = event.u.ExitProcess.dwExitCode;
 479           CloseHandle (current_process);
 480           CloseHandle (current_thread);
 481           return current_process_id;
 482           break;
 483
 484         case LOAD_DLL_DEBUG_EVENT:
 485           DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
 486                         event.dwProcessId, event.dwThreadId,
 487                         "LOAD_DLL_DEBUG_EVENT"));
 488           catch_errors (handle_load_dll,
 489                         (char*) &event,
 490                         "\n[failed reading symbols from DLL]\n",
 491                         RETURN_MASK_ALL);
 492           registers_changed();          /* mark all regs invalid */
 493           break;
 494         case UNLOAD_DLL_DEBUG_EVENT:
 495           DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
 496                         event.dwProcessId, event.dwThreadId,
 497                         "UNLOAD_DLL_DEBUG_EVENT"));
 498           break;        /* FIXME: don't know what to do here */
 499         case EXCEPTION_DEBUG_EVENT:
 500           DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
 501                         event.dwProcessId, event.dwThreadId,
 502                         "EXCEPTION_DEBUG_EVENT"));
 503           if (handle_exception (&event, ourstatus))
 504             return current_process_id;
 505           continue_status = DBG_EXCEPTION_NOT_HANDLED;
 506           break;
 507
 508         case OUTPUT_DEBUG_STRING_EVENT: /* message from the kernel */
 509           DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
 510                         event.dwProcessId, event.dwThreadId,
 511                         "OUTPUT_DEBUG_STRING_EVENT"));
 512           if (target_read_string
 513               ((CORE_ADDR) event.u.DebugString.lpDebugStringData,
 514                &p, 1024, 0) && p && *p)
 515             {
 516               warning(p);
 517               free(p);
 518             }
 519           break;
 520         default:
 521           printf_unfiltered ("gdb: kernel event for pid=%d tid=%d\n",
 522                              event.dwProcessId, event.dwThreadId);
 523           printf_unfiltered ("                 unknown event code %d\n",
 524                              event.dwDebugEventCode);
 525           break;
 526         }
 527       DEBUG_EVENTS (("ContinueDebugEvent (cpid=%d, ctid=%d, DBG_CONTINUE);\n",
 528                      current_process_id, current_thread_id));
 529       CHECK (ContinueDebugEvent (current_process_id,
 530                                  current_thread_id,
 531                                  continue_status));
 532     }
 533 }
 534
 535 /* Attach to process PID, then initialize for debugging it.  */
 536
 537 static void
 538 child_attach (args, from_tty)
 539      char *args;
 540      int from_tty;
 541 {
 542   BOOL ok;
 543
 544   if (!args)
 545     error_no_arg ("process-id to attach");
 546
 547   current_process_id = strtoul (args, 0, 0);
 548
 549   ok = DebugActiveProcess (current_process_id);
 550
 551   if (!ok)
 552     error ("Can't attach to process.");
 553
 554   exception_count = 0;
 555   event_count = 0;
 556
 557   if (from_tty)
 558     {
 559       char *exec_file = (char *) get_exec_file (0);
 560
 561       if (exec_file)
 562         printf_unfiltered ("Attaching to program `%s', %s\n", exec_file,
 563                            target_pid_to_str (current_process_id));
 564       else
 565         printf_unfiltered ("Attaching to %s\n",
 566                            target_pid_to_str (current_process_id));
 567
 568       gdb_flush (gdb_stdout);
 569     }
 570
 571   inferior_pid = current_process_id;
 572   push_target (&child_ops);
 573 }
 574
 575 static void
 576 child_detach (args, from_tty)
 577      char *args;
 578      int from_tty;
 579 {
 580   if (from_tty)
 581     {
 582       char *exec_file = get_exec_file (0);
 583       if (exec_file == 0)
 584         exec_file = "";
 585       printf_unfiltered ("Detaching from program: %s %s\n", exec_file,
 586                          target_pid_to_str (inferior_pid));
 587       gdb_flush (gdb_stdout);
 588     }
 589   inferior_pid = 0;
 590   unpush_target (&child_ops);
 591 }
 592
 593 /* Print status information about what we're accessing.  */
 594
 595 static void
 596 child_files_info (ignore)
 597      struct target_ops *ignore;
 598 {
 599   printf_unfiltered ("\tUsing the running image of %s %s.\n",
 600       attach_flag ? "attached" : "child", target_pid_to_str (inferior_pid));
 601 }
 602
 603 /* ARGSUSED */
 604 static void
 605 child_open (arg, from_tty)
 606      char *arg;
 607      int from_tty;
 608 {
 609   error ("Use the \"run\" command to start a Unix child process.");
 610 }
 611
 612 /* Start an inferior win32 child process and sets inferior_pid to its pid.
 613    EXEC_FILE is the file to run.
 614    ALLARGS is a string containing the arguments to the program.
 615    ENV is the environment vector to pass.  Errors reported with error().  */
 616
 617 static void
 618 child_create_inferior (exec_file, allargs, env)
 619      char *exec_file;
 620      char *allargs;
 621      char **env;
 622 {
 623   char real_path[MAXPATHLEN];
 624   char *winenv;
 625   char *temp;
 626   int  envlen;
 627   int i;
 628
 629   STARTUPINFO si;
 630   PROCESS_INFORMATION pi;
 631   struct target_waitstatus dummy;
 632   BOOL ret;
 633   DWORD flags;
 634   char *args;
 635
 636   if (!exec_file)
 637     {
 638       error ("No executable specified, use `target exec'.\n");
 639     }
 640
 641   memset (&si, 0, sizeof (si));
 642   si.cb = sizeof (si);
 643
 644   cygwin32_conv_to_win32_path (exec_file, real_path);
 645
 646   flags = DEBUG_ONLY_THIS_PROCESS;
 647
 648   if (new_group)
 649     flags |= CREATE_NEW_PROCESS_GROUP;
 650
 651   if (new_console)
 652     flags |= CREATE_NEW_CONSOLE;
 653
 654   args = alloca (strlen (real_path) + strlen (allargs) + 2);
 655
 656   strcpy (args, real_path);
 657
 658   strcat (args, " ");
 659   strcat (args, allargs);
 660
 661   /* Prepare the environment vars for CreateProcess.  */
 662   {
 663     /* This code use to assume all env vars were file names and would
 664        translate them all to win32 style.  That obviously doesn't work in the
 665        general case.  The current rule is that we only translate PATH.
 666        We need to handle PATH because we're about to call CreateProcess and
 667        it uses PATH to find DLL's.  Fortunately PATH has a well-defined value
 668        in both posix and win32 environments.  cygwin.dll will change it back
 669        to posix style if necessary.  */
 670
 671     static const char *conv_path_names[] =
 672       {
 673         "PATH=",
 674         0
 675       };
 676
 677     /* CreateProcess takes the environment list as a null terminated set of
 678        strings (i.e. two nulls terminate the list).  */
 679
 680     /* Get total size for env strings.  */
 681     for (envlen = 0, i = 0; env[i] && *env[i]; i++)
 682       {
 683         int j, len;
 684
 685         for (j = 0; conv_path_names[j]; j++)
 686           {
 687             len = strlen (conv_path_names[j]);
 688             if (strncmp (conv_path_names[j], env[i], len) == 0)
 689               {
 690                 if (cygwin32_posix_path_list_p (env[i] + len))
 691                   envlen += len
 692                     + cygwin32_posix_to_win32_path_list_buf_size (env[i] + len);
 693                 else
 694                   envlen += strlen (env[i]) + 1;
 695                 break;
 696               }
 697           }
 698         if (conv_path_names[j] == NULL)
 699           envlen += strlen (env[i]) + 1;
 700       }
 701
 702     winenv = alloca (envlen + 1);
 703
 704     /* Copy env strings into new buffer.  */
 705     for (temp = winenv, i = 0; env[i] && *env[i]; i++)
 706       {
 707         int j, len;
 708
 709         for (j = 0; conv_path_names[j]; j++)
 710           {
 711             len = strlen (conv_path_names[j]);
 712             if (strncmp (conv_path_names[j], env[i], len) == 0)
 713               {
 714                 if (cygwin32_posix_path_list_p (env[i] + len))
 715                   {
 716                     memcpy (temp, env[i], len);
 717                     cygwin32_posix_to_win32_path_list (env[i] + len, temp + len);
 718                   }
 719                 else
 720                   strcpy (temp, env[i]);
 721                 break;
 722               }
 723           }
 724         if (conv_path_names[j] == NULL)
 725           strcpy (temp, env[i]);
 726
 727         temp += strlen (temp) + 1;
 728       }
 729
 730     /* Final nil string to terminate new env.  */
 731     *temp = 0;
 732   }
 733
 734   ret = CreateProcess (0,
 735                        args,    /* command line */
 736                        NULL,    /* Security */
 737                        NULL,    /* thread */
 738                        TRUE,    /* inherit handles */
 739                        flags,   /* start flags */
 740                        winenv,
 741                        NULL,    /* current directory */
 742                        &si,
 743                        &pi);
 744   if (!ret)
 745     error ("Error creating process %s, (error %d)\n", exec_file, GetLastError());
 746
 747   exception_count = 0;
 748   event_count = 0;
 749
 750   inferior_pid = pi.dwProcessId;
 751   current_process = pi.hProcess;
 752   current_thread = pi.hThread;
 753   current_process_id = pi.dwProcessId;
 754   current_thread_id = pi.dwThreadId;
 755   push_target (&child_ops);
 756   init_thread_list ();
 757   init_wait_for_inferior ();
 758   clear_proceed_status ();
 759   target_terminal_init ();
 760   target_terminal_inferior ();
 761
 762   /* Ignore the first trap */
 763   child_wait (inferior_pid, &dummy);
 764
 765   proceed ((CORE_ADDR) - 1, TARGET_SIGNAL_0, 0);
 766 }
 767
 768 static void
 769 child_mourn_inferior ()
 770 {
 771   (void) ContinueDebugEvent (current_process_id,
 772                              current_thread_id,
 773                              DBG_CONTINUE);
 774   unpush_target (&child_ops);
 775   generic_mourn_inferior ();
 776 }
 777
 778 /* Send a SIGINT to the process group.  This acts just like the user typed a
 779    ^C on the controlling terminal. */
 780
 781 static void
 782 child_stop ()
 783 {
 784   DEBUG_EVENTS (("gdb: GenerateConsoleCtrlEvent (CTRLC_EVENT, 0)\n"));
 785   CHECK (GenerateConsoleCtrlEvent (CTRL_C_EVENT, 0));
 786   registers_changed();          /* refresh register state */
 787 }
 788
 789 int
 790 child_xfer_memory (CORE_ADDR memaddr, char *our, int len,
 791                    int write, struct target_ops *target)
 792 {
 793   DWORD done;
 794   if (write)
 795     {
 796       DEBUG_MEM (("gdb: write target memory, %d bytes at 0x%08x\n",
 797                   len, memaddr));
 798       WriteProcessMemory (current_process, memaddr, our, len, &done);
 799       FlushInstructionCache (current_process, memaddr, len);
 800     }
 801   else
 802     {
 803       DEBUG_MEM (("gdb: read target memory, %d bytes at 0x%08x\n",
 804                   len, memaddr));
 805       ReadProcessMemory (current_process, memaddr, our, len, &done);
 806     }
 807   return done;
 808 }
 809
 810 void
 811 child_kill_inferior (void)
 812 {
 813   CHECK (TerminateProcess (current_process, 0));
 814
 815   for (;;)
 816     {
 817       DEBUG_EVENT event;
 818       if (!ContinueDebugEvent (current_process_id,
 819                                current_thread_id,
 820                                DBG_CONTINUE))
 821         break;
 822       if (!WaitForDebugEvent (&event, INFINITE))
 823         break;
 824       current_thread_id = event.dwThreadId;
 825       current_process_id = event.dwProcessId;
 826       if (event.dwDebugEventCode == EXIT_PROCESS_DEBUG_EVENT)
 827         break;
 828     }
 829
 830   CHECK (CloseHandle (current_process));
 831   CHECK (CloseHandle (current_thread));
 832   target_mourn_inferior();      /* or just child_mourn_inferior? */
 833 }
 834
 835 void
 836 child_resume (int pid, int step, enum target_signal signal)
 837 {
 838   DEBUG_EXEC (("gdb: child_resume (pid=%d, step=%d, signal=%d);\n",
 839                pid, step, signal));
 840
 841   if (step)
 842     {
 843 #ifdef __PPC__
 844       warning ("Single stepping not done.\n");
 845 #endif
 846 #ifdef i386
 847       /* Single step by setting t bit */
 848       child_fetch_inferior_registers (PS_REGNUM);
 849       context.EFlags |= FLAG_TRACE_BIT;
 850 #endif
 851     }
 852
 853   if (context.ContextFlags)
 854     {
 855       CHECK (SetThreadContext (current_thread, &context));
 856       context.ContextFlags = 0;
 857     }
 858
 859   if (signal)
 860     {
 861       fprintf_unfiltered (gdb_stderr, "Can't send signals to the child.\n");
 862     }
 863
 864   DEBUG_EVENTS (("gdb: ContinueDebugEvent (cpid=%d, ctid=%d, DBG_CONTINUE);\n",
 865                  current_process_id, current_thread_id));
 866   CHECK (ContinueDebugEvent (current_process_id,
 867                              current_thread_id,
 868                              DBG_CONTINUE));
 869 }
 870
 871 static void
 872 child_prepare_to_store ()
 873 {
 874   /* Do nothing, since we can store individual regs */
 875 }
 876
 877 static int
 878 child_can_run ()
 879 {
 880   return 1;
 881 }
 882
 883 static void
 884 child_close ()
 885 {
 886   DEBUG_EVENTS (("gdb: child_close, inferior_pid=%d\n", inferior_pid));
 887 }
 888
 889 struct target_ops child_ops ;
 890
 891 static void init_child_ops(void)
 892 {
 893   child_ops.to_shortname =   "child";
 894   child_ops.to_longname =   "Win32 child process";
 895   child_ops.to_doc =   "Win32 child process (started by the \"run\" command).";
 896   child_ops.to_open =   child_open;
 897   child_ops.to_close =   child_close;
 898   child_ops.to_attach =   child_attach;
 899   child_ops.to_detach =   child_detach;
 900   child_ops.to_resume =   child_resume;
 901   child_ops.to_wait  =   child_wait;
 902   child_ops.to_fetch_registers  =   child_fetch_inferior_registers;
 903   child_ops.to_store_registers  =   child_store_inferior_registers;
 904   child_ops.to_prepare_to_store =   child_prepare_to_store;
 905   child_ops.to_xfer_memory  =   child_xfer_memory;
 906   child_ops.to_files_info  =   child_files_info;
 907   child_ops.to_insert_breakpoint =   memory_insert_breakpoint;
 908   child_ops.to_remove_breakpoint =   memory_remove_breakpoint;
 909   child_ops.to_terminal_init  =   terminal_init_inferior;
 910   child_ops.to_terminal_inferior =   terminal_inferior;
 911   child_ops.to_terminal_ours_for_output =   terminal_ours_for_output;
 912   child_ops.to_terminal_ours  =   terminal_ours;
 913   child_ops.to_terminal_info  =   child_terminal_info;
 914   child_ops.to_kill  =   child_kill_inferior;
 915   child_ops.to_load  =   0;
 916   child_ops.to_lookup_symbol =   0;
 917   child_ops.to_create_inferior =   child_create_inferior;
 918   child_ops.to_mourn_inferior =   child_mourn_inferior;
 919   child_ops.to_can_run  =   child_can_run;
 920   child_ops.to_notice_signals =   0;
 921   child_ops.to_thread_alive  =   0;
 922   child_ops.to_stop  =   child_stop;
 923   child_ops.to_stratum =   process_stratum;
 924   child_ops.DONT_USE =   0;
 925   child_ops.to_has_all_memory =   1;
 926   child_ops.to_has_memory =   1;
 927   child_ops.to_has_stack =   1;
 928   child_ops.to_has_registers =   1;
 929   child_ops.to_has_execution =   1;
 930   child_ops.to_sections =   0;
 931   child_ops.to_sections_end =   0;
 932   child_ops.to_magic =   OPS_MAGIC;
 933 }
 934
 935 void
 936 _initialize_inftarg ()
 937 {
 938   struct cmd_list_element *c;
 939   init_child_ops() ;
 940
 941   add_show_from_set
 942     (add_set_cmd ("new-console", class_support, var_boolean,
 943                   (char *) &new_console,
 944                   "Set creation of new console when creating child process.",
 945                   &setlist),
 946      &showlist);
 947
 948   add_show_from_set
 949     (add_set_cmd ("new-group", class_support, var_boolean,
 950                   (char *) &new_group,
 951                   "Set creation of new group when creating child process.",
 952                   &setlist),
 953      &showlist);
 954
 955   add_show_from_set
 956     (add_set_cmd ("debugexec", class_support, var_boolean,
 957                   (char *) &debug_exec,
 958                   "Set whether to display execution in child process.",
 959                   &setlist),
 960      &showlist);
 961
 962   add_show_from_set
 963     (add_set_cmd ("debugevents", class_support, var_boolean,
 964                   (char *) &debug_events,
 965                   "Set whether to display kernel events in child process.",
 966                   &setlist),
 967      &showlist);
 968
 969   add_show_from_set
 970     (add_set_cmd ("debugmemory", class_support, var_boolean,
 971                   (char *) &debug_memory,
 972                   "Set whether to display memory accesses in child process.",
 973                   &setlist),
 974      &showlist);
 975
 976   add_show_from_set
 977     (add_set_cmd ("debugexceptions", class_support, var_boolean,
 978                   (char *) &debug_exceptions,
 979                   "Set whether to display kernel exceptions in child process.",
 980                   &setlist),
 981      &showlist);
 982
 983   add_target (&child_ops);
 984 }