gdb/win32-nat.c

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