gdb/win32-nat.c

   1 /* Target-vector operations for controlling win32 child processes, for GDB.
   2    Copyright 1995, 1996, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
   3    Contributed by Cygnus Solutions, A Red Hat Company.
   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,
  20    Boston, MA 02111-1307, USA.
  21  */
  22
  23 /* by Steve Chamberlain, sac@cygnus.com */
  24
  25 /* We assume we're being built with and will be used for cygwin.  */
  26
  27 #include "defs.h"
  28 #include "frame.h"              /* required by inferior.h */
  29 #include "inferior.h"
  30 #include "target.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 #include <imagehlp.h>
  43 #endif
  44
  45 #include "buildsym.h"
  46 #include "symfile.h"
  47 #include "objfiles.h"
  48 #include "gdb_string.h"
  49 #include "gdbthread.h"
  50 #include "gdbcmd.h"
  51 #include <sys/param.h>
  52 #include <unistd.h>
  53
  54 /* The ui's event loop. */
  55 extern int (*ui_loop_hook) PARAMS ((int signo));
  56
  57 /* If we're not using the old Cygwin header file set, define the
  58    following which never should have been in the generic Win32 API
  59    headers in the first place since they were our own invention... */
  60 #ifndef _GNU_H_WINDOWS_H
  61 #define FLAG_TRACE_BIT 0x100
  62 #define CONTEXT_DEBUGGER (CONTEXT_FULL | CONTEXT_FLOATING_POINT)
  63 #endif
  64
  65 /* The string sent by cygwin when it processes a signal.
  66    FIXME: This should be in a cygwin include file. */
  67 #define CYGWIN_SIGNAL_STRING "cygwin: signal"
  68
  69 #define CHECK(x)        check (x, __FILE__,__LINE__)
  70 #define DEBUG_EXEC(x)   if (debug_exec)         printf x
  71 #define DEBUG_EVENTS(x) if (debug_events)       printf x
  72 #define DEBUG_MEM(x)    if (debug_memory)       printf x
  73 #define DEBUG_EXCEPT(x) if (debug_exceptions)   printf x
  74
  75 /* Forward declaration */
  76 extern struct target_ops child_ops;
  77
  78 static void child_stop PARAMS ((void));
  79 static int win32_child_thread_alive PARAMS ((int));
  80 void child_kill_inferior PARAMS ((void));
  81
  82 /* Thread information structure used to track information that is
  83    not available in gdb's thread structure. */
  84 typedef struct thread_info_struct
  85   {
  86     struct thread_info_struct *next;
  87     DWORD id;
  88     HANDLE h;
  89     char *name;
  90     int suspend_count;
  91     CONTEXT context;
  92     STACKFRAME sf;
  93   } thread_info;
  94
  95 static thread_info thread_head = {NULL};
  96
  97 /* The saved state for a continue after breaking back to gdb. */
  98 static DWORD continue_status;
  99
 100 /* The process and thread handles for the above context. */
 101
 102 static DEBUG_EVENT current_event;       /* The current debug event from
 103                                            WaitForDebugEvent */
 104 static HANDLE current_process_handle;   /* Currently executing process */
 105 static thread_info *current_thread;     /* Info on currently selected thread */
 106 static DWORD main_thread_id;    /* Thread ID of the main thread */
 107
 108 /* Counts of things. */
 109 static int exception_count = 0;
 110 static int event_count = 0;
 111
 112 /* User options. */
 113 static int new_console = 0;
 114 static int new_group = 1;
 115 static int debug_exec = 0;      /* show execution */
 116 static int debug_events = 0;    /* show events from kernel */
 117 static int debug_memory = 0;    /* show target memory accesses */
 118 static int debug_exceptions = 0;        /* show target exceptions */
 119
 120 /* This vector maps GDB's idea of a register's number into an address
 121    in the win32 exception context vector.
 122
 123    It also contains the bit mask needed to load the register in question.
 124
 125    One day we could read a reg, we could inspect the context we
 126    already have loaded, if it doesn't have the bit set that we need,
 127    we read that set of registers in using GetThreadContext.  If the
 128    context already contains what we need, we just unpack it. Then to
 129    write a register, first we have to ensure that the context contains
 130    the other regs of the group, and then we copy the info in and set
 131    out bit. */
 132
 133 #define context_offset(x) ((int)&(((CONTEXT *)NULL)->x))
 134 static const int mappings[] =
 135 {
 136   context_offset (Eax),
 137   context_offset (Ecx),
 138   context_offset (Edx),
 139   context_offset (Ebx),
 140   context_offset (Esp),
 141   context_offset (Ebp),
 142   context_offset (Esi),
 143   context_offset (Edi),
 144   context_offset (Eip),
 145   context_offset (EFlags),
 146   context_offset (SegCs),
 147   context_offset (SegSs),
 148   context_offset (SegDs),
 149   context_offset (SegEs),
 150   context_offset (SegFs),
 151   context_offset (SegGs),
 152   context_offset (FloatSave.RegisterArea[0 * 10]),
 153   context_offset (FloatSave.RegisterArea[1 * 10]),
 154   context_offset (FloatSave.RegisterArea[2 * 10]),
 155   context_offset (FloatSave.RegisterArea[3 * 10]),
 156   context_offset (FloatSave.RegisterArea[4 * 10]),
 157   context_offset (FloatSave.RegisterArea[5 * 10]),
 158   context_offset (FloatSave.RegisterArea[6 * 10]),
 159   context_offset (FloatSave.RegisterArea[7 * 10]),
 160   context_offset (FloatSave.ControlWord),
 161   context_offset (FloatSave.StatusWord),
 162   context_offset (FloatSave.TagWord),
 163   context_offset (FloatSave.ErrorSelector),
 164   context_offset (FloatSave.ErrorOffset),
 165   context_offset (FloatSave.DataSelector),
 166   context_offset (FloatSave.DataOffset),
 167   context_offset (FloatSave.ErrorSelector)
 168 };
 169
 170 #undef context_offset
 171
 172 /* This vector maps the target's idea of an exception (extracted
 173    from the DEBUG_EVENT structure) to GDB's idea. */
 174
 175 struct xlate_exception
 176   {
 177     int them;
 178     enum target_signal us;
 179   };
 180
 181 static const struct xlate_exception
 182   xlate[] =
 183 {
 184   {EXCEPTION_ACCESS_VIOLATION, TARGET_SIGNAL_SEGV},
 185   {STATUS_STACK_OVERFLOW, TARGET_SIGNAL_SEGV},
 186   {EXCEPTION_BREAKPOINT, TARGET_SIGNAL_TRAP},
 187   {DBG_CONTROL_C, TARGET_SIGNAL_INT},
 188   {EXCEPTION_SINGLE_STEP, TARGET_SIGNAL_TRAP},
 189   {-1, -1}};
 190
 191 /* Find a thread record given a thread id.
 192    If get_context then also retrieve the context for this
 193    thread. */
 194 static thread_info *
 195 thread_rec (DWORD id, int get_context)
 196 {
 197   thread_info *th;
 198
 199   for (th = &thread_head; (th = th->next) != NULL;)
 200     if (th->id == id)
 201       {
 202         if (!th->suspend_count && get_context)
 203           {
 204             if (get_context > 0)
 205               th->suspend_count = SuspendThread (th->h) + 1;
 206             else if (get_context < 0)
 207               th->suspend_count = -1;
 208
 209             th->context.ContextFlags = CONTEXT_DEBUGGER;
 210             GetThreadContext (th->h, &th->context);
 211           }
 212         return th;
 213       }
 214
 215   return NULL;
 216 }
 217
 218 /* Add a thread to the thread list */
 219 static thread_info *
 220 child_add_thread (DWORD id, HANDLE h)
 221 {
 222   thread_info *th;
 223
 224   if ((th = thread_rec (id, FALSE)))
 225     return th;
 226
 227   th = (thread_info *) xmalloc (sizeof (*th));
 228   memset (th, 0, sizeof (*th));
 229   th->id = id;
 230   th->h = h;
 231   th->next = thread_head.next;
 232   thread_head.next = th;
 233   add_thread (id);
 234   return th;
 235 }
 236
 237 /* Clear out any old thread list and reintialize it to a
 238    pristine state. */
 239 static void
 240 child_init_thread_list ()
 241 {
 242   thread_info *th = &thread_head;
 243
 244   DEBUG_EVENTS (("gdb: child_init_thread_list\n"));
 245   init_thread_list ();
 246   while (th->next != NULL)
 247     {
 248       thread_info *here = th->next;
 249       th->next = here->next;
 250       (void) CloseHandle (here->h);
 251       free (here);
 252     }
 253 }
 254
 255 /* Delete a thread from the list of threads */
 256 static void
 257 child_delete_thread (DWORD id)
 258 {
 259   thread_info *th;
 260
 261   if (info_verbose)
 262     printf_unfiltered ("[Deleting %s]\n", target_pid_to_str (id));
 263   delete_thread (id);
 264
 265   for (th = &thread_head;
 266        th->next != NULL && th->next->id != id;
 267        th = th->next)
 268     continue;
 269
 270   if (th->next != NULL)
 271     {
 272       thread_info *here = th->next;
 273       th->next = here->next;
 274       CloseHandle (here->h);
 275       free (here);
 276     }
 277 }
 278
 279 static void
 280 check (BOOL ok, const char *file, int line)
 281 {
 282   if (!ok)
 283     printf_filtered ("error return %s:%d was %d\n", file, line, GetLastError ());
 284 }
 285
 286 static void
 287 do_child_fetch_inferior_registers (int r)
 288 {
 289   char *context_offset = ((char *) &current_thread->context) + mappings[r];
 290   long l;
 291   if (r == FCS_REGNUM)
 292     {
 293       l = *((long *)context_offset) & 0xffff;
 294       supply_register (r, (char *) &l);
 295     }
 296   else if (r == FOP_REGNUM)
 297     {
 298       l = (*((long *)context_offset) >> 16) & ((1 << 11) - 1);
 299       supply_register (r, (char *) &l);
 300     }
 301   else if (r >= 0)
 302     supply_register (r, context_offset);
 303   else
 304     {
 305       for (r = 0; r < NUM_REGS; r++)
 306         do_child_fetch_inferior_registers (r);
 307     }
 308 }
 309
 310 static void
 311 child_fetch_inferior_registers (int r)
 312 {
 313   current_thread = thread_rec (inferior_pid, TRUE);
 314   do_child_fetch_inferior_registers (r);
 315 }
 316
 317 static void
 318 do_child_store_inferior_registers (int r)
 319 {
 320   if (r >= 0)
 321     read_register_gen (r, ((char *) &current_thread->context) + mappings[r]);
 322   else
 323     {
 324       for (r = 0; r < NUM_REGS; r++)
 325         do_child_store_inferior_registers (r);
 326     }
 327 }
 328
 329 /* Store a new register value into the current thread context */
 330 static void
 331 child_store_inferior_registers (int r)
 332 {
 333   current_thread = thread_rec (inferior_pid, TRUE);
 334   do_child_store_inferior_registers (r);
 335 }
 336
 337 #include <psapi.h>
 338 static int psapi_loaded = 0;
 339 static HMODULE psapi_module_handle = NULL;
 340 static BOOL  WINAPI (*psapi_EnumProcessModules)(HANDLE, HMODULE*, DWORD, LPDWORD)= NULL;
 341 static BOOL  WINAPI (*psapi_GetModuleInformation) (HANDLE, HMODULE, LPMODULEINFO, DWORD)= NULL;
 342 static DWORD WINAPI (*psapi_GetModuleFileNameExA) (HANDLE, HMODULE, LPSTR, DWORD)= NULL;
 343
 344 int psapi_get_dll_name (DWORD BaseAddress, char *dll_name_ret)
 345 {
 346   DWORD len;
 347   MODULEINFO mi;
 348   int i;
 349   HMODULE dh_buf [ 1 ];
 350   HMODULE* DllHandle = dh_buf;
 351   DWORD cbNeeded;
 352   BOOL ok;
 353
 354   if (!psapi_loaded ||
 355        psapi_EnumProcessModules   == NULL ||
 356        psapi_GetModuleInformation == NULL ||
 357        psapi_GetModuleFileNameExA == NULL)
 358     {
 359       if (psapi_loaded)goto failed;
 360       psapi_loaded = 1;
 361       psapi_module_handle = LoadLibrary ("psapi.dll");
 362       if (!psapi_module_handle)
 363         {
 364           /* printf_unfiltered ("error loading psapi.dll: %u", GetLastError ());*/
 365           goto failed;
 366         }
 367       psapi_EnumProcessModules   = GetProcAddress (psapi_module_handle, "EnumProcessModules" );
 368       psapi_GetModuleInformation = GetProcAddress (psapi_module_handle, "GetModuleInformation");
 369       psapi_GetModuleFileNameExA = (void *) GetProcAddress (psapi_module_handle,
 370                                                             "GetModuleFileNameExA");
 371       if (psapi_EnumProcessModules   == NULL ||
 372            psapi_GetModuleInformation == NULL ||
 373            psapi_GetModuleFileNameExA == NULL)
 374         goto failed;
 375     }
 376
 377   cbNeeded = 0;
 378   ok = (*psapi_EnumProcessModules) (current_process_handle,
 379                                      DllHandle,
 380                                      sizeof (HMODULE),
 381                                      &cbNeeded);
 382
 383   if (!ok || !cbNeeded)
 384     goto failed;
 385
 386   DllHandle = (HMODULE*) alloca (cbNeeded);
 387   if (!DllHandle)
 388     goto failed;
 389
 390   ok = (*psapi_EnumProcessModules) (current_process_handle,
 391                                      DllHandle,
 392                                      cbNeeded,
 393                                      &cbNeeded);
 394   if (!ok)
 395     goto failed;
 396
 397   for (i = 0; i < cbNeeded / sizeof (HMODULE); i++)
 398     {
 399       if (!(*psapi_GetModuleInformation) (current_process_handle,
 400                                              DllHandle [i],
 401                                              &mi,
 402                                              sizeof (mi)))
 403         error ("Can't get module info");
 404
 405       len = (*psapi_GetModuleFileNameExA) (current_process_handle,
 406                                             DllHandle [i],
 407                                             dll_name_ret,
 408                                             MAX_PATH);
 409       if (len == 0)
 410         error ("Error getting dll name: %u\n", GetLastError ());
 411
 412       if ((DWORD) (mi.lpBaseOfDll) == BaseAddress)
 413         return 1;
 414     }
 415
 416 failed:
 417   dll_name_ret[0] = '\0';
 418   return 0;
 419 }
 420
 421 /* Wait for child to do something.  Return pid of child, or -1 in case
 422    of error; store status through argument pointer OURSTATUS.  */
 423
 424 static int
 425 handle_load_dll (PTR dummy)
 426 {
 427   LOAD_DLL_DEBUG_INFO *event = &current_event.u.LoadDll;
 428   DWORD dll_name_ptr;
 429   DWORD done;
 430   char dll_buf[MAX_PATH + 1];
 431   char *p, *dll_name = NULL;
 432   struct objfile *objfile;
 433   MEMORY_BASIC_INFORMATION minfo;
 434   struct section_addr_info section_addrs;
 435
 436   memset (&section_addrs, 0, sizeof (section_addrs));
 437   dll_buf[0] = dll_buf[sizeof (dll_buf) - 1] = '\0';
 438
 439   if (!psapi_get_dll_name ((DWORD) (event->lpBaseOfDll), dll_buf))
 440     dll_buf[0] = dll_buf[sizeof(dll_buf) - 1] = '\0';
 441
 442   dll_name = dll_buf;
 443
 444   /* Attempt to read the name of the dll that was detected.
 445      This is documented to work only when actively debugging
 446      a program.  It will not work for attached processes. */
 447   if (dll_name == NULL || *dll_name == '\0')
 448     {
 449       int size = event->fUnicode ? sizeof (WCHAR) : sizeof (char);
 450       int len = 0;
 451       char b[2];
 452
 453       ReadProcessMemory (current_process_handle,
 454                          (LPCVOID) event->lpImageName,
 455                          (char *) &dll_name_ptr,
 456                          sizeof (dll_name_ptr), &done);
 457
 458       /* See if we could read the address of a string, and that the
 459          address isn't null. */
 460
 461       if (done != sizeof (dll_name_ptr) || !dll_name_ptr)
 462         return 1;
 463
 464       do
 465         {
 466           ReadProcessMemory (current_process_handle,
 467                              (LPCVOID) (dll_name_ptr + len * size),
 468                              &b,
 469                              size,
 470                              &done);
 471           len++;
 472         }
 473       while ((b[0] != 0 || b[size - 1] != 0) && done == size);
 474
 475       dll_name = alloca (len);
 476
 477       if (event->fUnicode)
 478         {
 479           WCHAR *unicode_dll_name = (WCHAR *) alloca (len * sizeof (WCHAR));
 480           ReadProcessMemory (current_process_handle,
 481                              (LPCVOID) dll_name_ptr,
 482                              unicode_dll_name,
 483                              len * sizeof (WCHAR),
 484                              &done);
 485
 486           WideCharToMultiByte (CP_ACP, 0,
 487                                unicode_dll_name, len,
 488                                dll_name, len, 0, 0);
 489         }
 490       else
 491         {
 492           ReadProcessMemory (current_process_handle,
 493                              (LPCVOID) dll_name_ptr,
 494                              dll_name,
 495                              len,
 496                              &done);
 497         }
 498     }
 499
 500   if (!dll_name)
 501     return 1;
 502
 503   while ((p = strchr (dll_name, '\\')))
 504     *p = '/';
 505
 506   /* The symbols in a dll are offset by 0x1000, which is the
 507      the offset from 0 of the first byte in an image - because
 508      of the file header and the section alignment.
 509
 510      FIXME: Is this the real reason that we need the 0x1000 ? */
 511
 512   printf_unfiltered ("%x:%s", event->lpBaseOfDll, dll_name);
 513   section_addrs.text_addr = (int) event->lpBaseOfDll + 0x1000;
 514   symbol_file_add (dll_name, 0, &section_addrs, 0, OBJF_SHARED);
 515   printf_unfiltered ("\n");
 516
 517   return 1;
 518 }
 519
 520 /* Handle DEBUG_STRING output from child process.
 521    Cygwin prepends its messages with a "cygwin:".  Interpret this as
 522    a Cygwin signal.  Otherwise just print the string as a warning. */
 523 static int
 524 handle_output_debug_string (struct target_waitstatus *ourstatus)
 525 {
 526   char *s;
 527   int gotasig = FALSE;
 528
 529   if (!target_read_string
 530     ((CORE_ADDR) current_event.u.DebugString.lpDebugStringData, &s, 1024, 0)
 531       || !s || !*s)
 532     return gotasig;
 533
 534   if (strncmp (s, CYGWIN_SIGNAL_STRING, sizeof (CYGWIN_SIGNAL_STRING) - 1) != 0)
 535     {
 536       if (strncmp (s, "cYg", 3) != 0)
 537         warning (s);
 538     }
 539   else
 540     {
 541       char *p;
 542       int sig = strtol (s + sizeof (CYGWIN_SIGNAL_STRING) - 1, &p, 0);
 543       gotasig = target_signal_from_host (sig);
 544       ourstatus->value.sig = gotasig;
 545       if (gotasig)
 546         ourstatus->kind = TARGET_WAITKIND_STOPPED;
 547     }
 548
 549   free (s);
 550   return gotasig;
 551 }
 552
 553 static int
 554 handle_exception (struct target_waitstatus *ourstatus)
 555 {
 556   int i;
 557   int done = 0;
 558   thread_info *th;
 559
 560   ourstatus->kind = TARGET_WAITKIND_STOPPED;
 561
 562   /* Record the context of the current thread */
 563   th = thread_rec (current_event.dwThreadId, -1);
 564
 565   switch (current_event.u.Exception.ExceptionRecord.ExceptionCode)
 566     {
 567     case EXCEPTION_ACCESS_VIOLATION:
 568       DEBUG_EXCEPT (("gdb: Target exception ACCESS_VIOLATION at 0x%08x\n",
 569                current_event.u.Exception.ExceptionRecord.ExceptionAddress));
 570       ourstatus->value.sig = TARGET_SIGNAL_SEGV;
 571       continue_status = DBG_EXCEPTION_NOT_HANDLED;
 572       break;
 573     case STATUS_FLOAT_UNDERFLOW:
 574     case STATUS_FLOAT_DIVIDE_BY_ZERO:
 575     case STATUS_FLOAT_OVERFLOW:
 576     case STATUS_INTEGER_DIVIDE_BY_ZERO:
 577       DEBUG_EXCEPT (("gdb: Target exception STACK_OVERFLOW at 0x%08x\n",
 578                current_event.u.Exception.ExceptionRecord.ExceptionAddress));
 579       ourstatus->value.sig = TARGET_SIGNAL_FPE;
 580       continue_status = DBG_EXCEPTION_NOT_HANDLED;
 581       break;
 582     case STATUS_STACK_OVERFLOW:
 583       DEBUG_EXCEPT (("gdb: Target exception STACK_OVERFLOW at 0x%08x\n",
 584                current_event.u.Exception.ExceptionRecord.ExceptionAddress));
 585       ourstatus->value.sig = TARGET_SIGNAL_SEGV;
 586       continue_status = DBG_EXCEPTION_NOT_HANDLED;
 587       break;
 588     case EXCEPTION_BREAKPOINT:
 589       DEBUG_EXCEPT (("gdb: Target exception BREAKPOINT at 0x%08x\n",
 590                current_event.u.Exception.ExceptionRecord.ExceptionAddress));
 591       ourstatus->value.sig = TARGET_SIGNAL_TRAP;
 592       break;
 593     case DBG_CONTROL_C:
 594       DEBUG_EXCEPT (("gdb: Target exception CONTROL_C at 0x%08x\n",
 595                current_event.u.Exception.ExceptionRecord.ExceptionAddress));
 596       ourstatus->value.sig = TARGET_SIGNAL_INT;
 597       continue_status = DBG_EXCEPTION_NOT_HANDLED;
 598       break;
 599     case EXCEPTION_SINGLE_STEP:
 600       DEBUG_EXCEPT (("gdb: Target exception SINGLE_STEP at 0x%08x\n",
 601                current_event.u.Exception.ExceptionRecord.ExceptionAddress));
 602       ourstatus->value.sig = TARGET_SIGNAL_TRAP;
 603       break;
 604     case EXCEPTION_ILLEGAL_INSTRUCTION:
 605       DEBUG_EXCEPT (("gdb: Target exception SINGLE_ILL at 0x%08x\n",
 606                current_event.u.Exception.ExceptionRecord.ExceptionAddress));
 607       ourstatus->value.sig = TARGET_SIGNAL_ILL;
 608       break;
 609     default:
 610       /* This may be a structured exception handling exception.  In
 611          that case, we want to let the program try to handle it, and
 612          only break if we see the exception a second time.
 613       if (current_event.u.Exception.dwFirstChance)
 614
 615         return 0;
 616 */
 617
 618       printf_unfiltered ("gdb: unknown target exception 0x%08x at 0x%08x\n",
 619                     current_event.u.Exception.ExceptionRecord.ExceptionCode,
 620                 current_event.u.Exception.ExceptionRecord.ExceptionAddress);
 621       ourstatus->value.sig = TARGET_SIGNAL_UNKNOWN;
 622       continue_status = DBG_EXCEPTION_NOT_HANDLED;
 623       break;
 624     }
 625   exception_count++;
 626   return 1;
 627 }
 628
 629 /* Resume all artificially suspended threads if we are continuing
 630    execution */
 631 static BOOL
 632 child_continue (int id)
 633 {
 634   int i;
 635   thread_info *th;
 636   BOOL res;
 637
 638   DEBUG_EVENTS (("ContinueDebugEvent (cpid=%d, ctid=%d, DBG_CONTINUE);\n",
 639                  current_event.dwProcessId, current_event.dwThreadId));
 640   res = ContinueDebugEvent (current_event.dwProcessId,
 641                             current_event.dwThreadId,
 642                             continue_status);
 643   continue_status = 0;
 644   if (res)
 645     for (th = &thread_head; (th = th->next) != NULL;)
 646       if (((id == -1) || (id == th->id)) && th->suspend_count)
 647         {
 648           for (i = 0; i < th->suspend_count; i++)
 649             (void) ResumeThread (th->h);
 650           th->suspend_count = 0;
 651         }
 652
 653   return res;
 654 }
 655
 656 static int
 657 get_child_debug_event (int pid, struct target_waitstatus *ourstatus,
 658                        DWORD *event_code, int *retval)
 659 {
 660   BOOL debug_event;
 661   int breakout = 1;
 662
 663   if (!(debug_event = WaitForDebugEvent (&current_event, 20)))
 664     {
 665       breakout = *retval = *event_code = 0;
 666       goto out;
 667     }
 668
 669   event_count++;
 670   continue_status = DBG_CONTINUE;
 671   *retval = 0;
 672
 673   switch (*event_code = current_event.dwDebugEventCode)
 674     {
 675     case CREATE_THREAD_DEBUG_EVENT:
 676       DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%x code=%s)\n",
 677                     (unsigned) current_event.dwProcessId,
 678                     (unsigned) current_event.dwThreadId,
 679                     "CREATE_THREAD_DEBUG_EVENT"));
 680       /* Record the existence of this thread */
 681       child_add_thread (current_event.dwThreadId,
 682                         current_event.u.CreateThread.hThread);
 683       if (info_verbose)
 684         printf_unfiltered ("[New %s]\n",
 685                       target_pid_to_str (current_event.dwThreadId));
 686       break;
 687
 688     case EXIT_THREAD_DEBUG_EVENT:
 689       DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
 690                     (unsigned) current_event.dwProcessId,
 691                     (unsigned) current_event.dwThreadId,
 692                     "EXIT_THREAD_DEBUG_EVENT"));
 693       child_delete_thread (current_event.dwThreadId);
 694       break;
 695
 696     case CREATE_PROCESS_DEBUG_EVENT:
 697       DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
 698                     (unsigned) current_event.dwProcessId,
 699                     (unsigned) current_event.dwThreadId,
 700                     "CREATE_PROCESS_DEBUG_EVENT"));
 701       current_process_handle = current_event.u.CreateProcessInfo.hProcess;
 702
 703       main_thread_id = inferior_pid = current_event.dwThreadId;
 704       /* Add the main thread */
 705       current_thread = child_add_thread (inferior_pid,
 706                          current_event.u.CreateProcessInfo.hThread);
 707       break;
 708
 709     case EXIT_PROCESS_DEBUG_EVENT:
 710       DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
 711                     (unsigned) current_event.dwProcessId,
 712                     (unsigned) current_event.dwThreadId,
 713                     "EXIT_PROCESS_DEBUG_EVENT"));
 714       ourstatus->kind = TARGET_WAITKIND_EXITED;
 715       ourstatus->value.integer = current_event.u.ExitProcess.dwExitCode;
 716       CloseHandle (current_process_handle);
 717       *retval = current_event.dwProcessId;
 718       goto out;
 719
 720     case LOAD_DLL_DEBUG_EVENT:
 721       DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
 722                     (unsigned) current_event.dwProcessId,
 723                     (unsigned) current_event.dwThreadId,
 724                     "LOAD_DLL_DEBUG_EVENT"));
 725       catch_errors (handle_load_dll, NULL, "", RETURN_MASK_ALL);
 726       registers_changed ();     /* mark all regs invalid */
 727       break;
 728
 729     case UNLOAD_DLL_DEBUG_EVENT:
 730       DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
 731                     (unsigned) current_event.dwProcessId,
 732                     (unsigned) current_event.dwThreadId,
 733                     "UNLOAD_DLL_DEBUG_EVENT"));
 734       break;            /* FIXME: don't know what to do here */
 735
 736     case EXCEPTION_DEBUG_EVENT:
 737       DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
 738                     (unsigned) current_event.dwProcessId,
 739                     (unsigned) current_event.dwThreadId,
 740                     "EXCEPTION_DEBUG_EVENT"));
 741       if (handle_exception (ourstatus)) /* sets continue_status */
 742         {
 743           *retval = current_event.dwThreadId;
 744           goto out;
 745         }
 746       break;
 747
 748     case OUTPUT_DEBUG_STRING_EVENT:
 749       DEBUG_EVENTS (("gdb: kernel event for pid=%d tid=%d code=%s)\n",
 750                     (unsigned) current_event.dwProcessId,
 751                     (unsigned) current_event.dwThreadId,
 752                     "OUTPUT_DEBUG_STRING_EVENT"));
 753       if (handle_output_debug_string (ourstatus))
 754         {
 755           *retval = main_thread_id;
 756           goto out;
 757         }
 758       break;
 759     default:
 760       printf_unfiltered ("gdb: kernel event for pid=%d tid=%d\n",
 761                          current_event.dwProcessId,
 762                          current_event.dwThreadId);
 763       printf_unfiltered ("                 unknown event code %d\n",
 764                          current_event.dwDebugEventCode);
 765       break;
 766     }
 767
 768   breakout = 0;
 769   CHECK (child_continue (-1));
 770   continue_status = 0;
 771
 772 out:
 773   return breakout;
 774 }
 775
 776
 777 /* Wait for interesting events to occur in the target process. */
 778 static int
 779 child_wait (int pid, struct target_waitstatus *ourstatus)
 780 {
 781   DWORD event_code;
 782   int retval;
 783
 784   /* We loop when we get a non-standard exception rather than return
 785      with a SPURIOUS because resume can try and step or modify things,
 786      which needs a current_thread->h.  But some of these exceptions mark
 787      the birth or death of threads, which mean that the current thread
 788      isn't necessarily what you think it is. */
 789
 790   while (1)
 791     {
 792       if (continue_status != 0)
 793         CHECK (child_continue (-1));
 794       if (get_child_debug_event (pid, ourstatus, &event_code, &retval))
 795         return retval;
 796       else
 797         {
 798           int detach = 0;
 799
 800           if (ui_loop_hook != NULL)
 801             detach = ui_loop_hook (0);
 802
 803           if (detach)
 804             child_kill_inferior ();
 805         }
 806     }
 807 }
 808
 809 /* Attach to process PID, then initialize for debugging it.  */
 810
 811 static void
 812 child_attach (args, from_tty)
 813      char *args;
 814      int from_tty;
 815 {
 816   BOOL ok;
 817
 818   if (!args)
 819     error_no_arg ("process-id to attach");
 820
 821   current_event.dwProcessId = strtoul (args, 0, 0);
 822
 823   ok = DebugActiveProcess (current_event.dwProcessId);
 824
 825   if (!ok)
 826     error ("Can't attach to process.");
 827
 828   exception_count = 0;
 829   event_count = 0;
 830
 831   if (from_tty)
 832     {
 833       char *exec_file = (char *) get_exec_file (0);
 834
 835       if (exec_file)
 836         printf_unfiltered ("Attaching to program `%s', %s\n", exec_file,
 837                            target_pid_to_str (current_event.dwProcessId));
 838       else
 839         printf_unfiltered ("Attaching to %s\n",
 840                            target_pid_to_str (current_event.dwProcessId));
 841
 842       gdb_flush (gdb_stdout);
 843     }
 844
 845   push_target (&child_ops);
 846 }
 847
 848 static void
 849 child_detach (args, from_tty)
 850      char *args;
 851      int from_tty;
 852 {
 853   if (from_tty)
 854     {
 855       char *exec_file = get_exec_file (0);
 856       if (exec_file == 0)
 857         exec_file = "";
 858       printf_unfiltered ("Detaching from program: %s %s\n", exec_file,
 859                          target_pid_to_str (inferior_pid));
 860       gdb_flush (gdb_stdout);
 861     }
 862   inferior_pid = 0;
 863   unpush_target (&child_ops);
 864 }
 865
 866 /* Print status information about what we're accessing.  */
 867
 868 static void
 869 child_files_info (ignore)
 870      struct target_ops *ignore;
 871 {
 872   printf_unfiltered ("\tUsing the running image of %s %s.\n",
 873       attach_flag ? "attached" : "child", target_pid_to_str (inferior_pid));
 874 }
 875
 876 /* ARGSUSED */
 877 static void
 878 child_open (arg, from_tty)
 879      char *arg;
 880      int from_tty;
 881 {
 882   error ("Use the \"run\" command to start a Unix child process.");
 883 }
 884
 885 /* Start an inferior win32 child process and sets inferior_pid to its pid.
 886    EXEC_FILE is the file to run.
 887    ALLARGS is a string containing the arguments to the program.
 888    ENV is the environment vector to pass.  Errors reported with error().  */
 889
 890 static void
 891 child_create_inferior (exec_file, allargs, env)
 892      char *exec_file;
 893      char *allargs;
 894      char **env;
 895 {
 896   char real_path[MAXPATHLEN];
 897   char *winenv;
 898   char *temp;
 899   int envlen;
 900   int i;
 901   STARTUPINFO si;
 902   PROCESS_INFORMATION pi;
 903   struct target_waitstatus dummy;
 904   BOOL ret;
 905   DWORD flags;
 906   char *args;
 907   DWORD event_code;
 908
 909   if (!exec_file)
 910     {
 911       error ("No executable specified, use `target exec'.\n");
 912     }
 913
 914   memset (&si, 0, sizeof (si));
 915   si.cb = sizeof (si);
 916
 917   cygwin32_conv_to_win32_path (exec_file, real_path);
 918
 919   flags = DEBUG_ONLY_THIS_PROCESS;
 920
 921   if (new_group)
 922     flags |= CREATE_NEW_PROCESS_GROUP;
 923
 924   if (new_console)
 925     flags |= CREATE_NEW_CONSOLE;
 926
 927   args = alloca (strlen (real_path) + strlen (allargs) + 2);
 928
 929   strcpy (args, real_path);
 930
 931   strcat (args, " ");
 932   strcat (args, allargs);
 933
 934   /* Prepare the environment vars for CreateProcess.  */
 935   {
 936     /* This code use to assume all env vars were file names and would
 937        translate them all to win32 style.  That obviously doesn't work in the
 938        general case.  The current rule is that we only translate PATH.
 939        We need to handle PATH because we're about to call CreateProcess and
 940        it uses PATH to find DLL's.  Fortunately PATH has a well-defined value
 941        in both posix and win32 environments.  cygwin.dll will change it back
 942        to posix style if necessary.  */
 943
 944     static const char *conv_path_names[] =
 945     {
 946       "PATH=",
 947       0
 948     };
 949
 950     /* CreateProcess takes the environment list as a null terminated set of
 951        strings (i.e. two nulls terminate the list).  */
 952
 953     /* Get total size for env strings.  */
 954     for (envlen = 0, i = 0; env[i] && *env[i]; i++)
 955       {
 956         int j, len;
 957
 958         for (j = 0; conv_path_names[j]; j++)
 959           {
 960             len = strlen (conv_path_names[j]);
 961             if (strncmp (conv_path_names[j], env[i], len) == 0)
 962               {
 963                 if (cygwin32_posix_path_list_p (env[i] + len))
 964                   envlen += len
 965                     + cygwin32_posix_to_win32_path_list_buf_size (env[i] + len);
 966                 else
 967                   envlen += strlen (env[i]) + 1;
 968                 break;
 969               }
 970           }
 971         if (conv_path_names[j] == NULL)
 972           envlen += strlen (env[i]) + 1;
 973       }
 974
 975     winenv = alloca (envlen + 1);
 976
 977     /* Copy env strings into new buffer.  */
 978     for (temp = winenv, i = 0; env[i] && *env[i]; i++)
 979       {
 980         int j, len;
 981
 982         for (j = 0; conv_path_names[j]; j++)
 983           {
 984             len = strlen (conv_path_names[j]);
 985             if (strncmp (conv_path_names[j], env[i], len) == 0)
 986               {
 987                 if (cygwin32_posix_path_list_p (env[i] + len))
 988                   {
 989                     memcpy (temp, env[i], len);
 990                     cygwin32_posix_to_win32_path_list (env[i] + len, temp + len);
 991                   }
 992                 else
 993                   strcpy (temp, env[i]);
 994                 break;
 995               }
 996           }
 997         if (conv_path_names[j] == NULL)
 998           strcpy (temp, env[i]);
 999
1000         temp += strlen (temp) + 1;
1001       }
1002
1003     /* Final nil string to terminate new env.  */
1004     *temp = 0;
1005   }
1006
1007   ret = CreateProcess (0,
1008                        args,    /* command line */
1009                        NULL,    /* Security */
1010                        NULL,    /* thread */
1011                        TRUE,    /* inherit handles */
1012                        flags,   /* start flags */
1013                        winenv,
1014                        NULL,    /* current directory */
1015                        &si,
1016                        &pi);
1017   if (!ret)
1018     error ("Error creating process %s, (error %d)\n", exec_file, GetLastError ());
1019
1020   exception_count = 0;
1021   event_count = 0;
1022
1023   current_process_handle = pi.hProcess;
1024   current_event.dwProcessId = pi.dwProcessId;
1025   memset (&current_event, 0, sizeof (current_event));
1026   inferior_pid = current_event.dwThreadId = pi.dwThreadId;
1027   push_target (&child_ops);
1028   child_init_thread_list ();
1029   init_wait_for_inferior ();
1030   clear_proceed_status ();
1031   target_terminal_init ();
1032   target_terminal_inferior ();
1033
1034   /* Run until process and threads are loaded */
1035   do
1036     get_child_debug_event (inferior_pid, &dummy, &event_code, &ret);
1037   while (event_code != EXCEPTION_DEBUG_EVENT);
1038
1039   SymSetOptions (SYMOPT_DEFERRED_LOADS);
1040   SymInitialize (current_process_handle, NULL, TRUE);
1041
1042   proceed ((CORE_ADDR) - 1, TARGET_SIGNAL_0, 0);
1043 }
1044
1045 static void
1046 child_mourn_inferior ()
1047 {
1048   continue_status = DBG_CONTINUE;
1049   (void) child_continue (-1);
1050   unpush_target (&child_ops);
1051   generic_mourn_inferior ();
1052 }
1053
1054 /* Send a SIGINT to the process group.  This acts just like the user typed a
1055    ^C on the controlling terminal. */
1056
1057 static void
1058 child_stop ()
1059 {
1060   DEBUG_EVENTS (("gdb: GenerateConsoleCtrlEvent (CTRLC_EVENT, 0)\n"));
1061   CHECK (GenerateConsoleCtrlEvent (CTRL_C_EVENT, current_event.dwProcessId));
1062   registers_changed ();         /* refresh register state */
1063 }
1064
1065 int
1066 child_xfer_memory (CORE_ADDR memaddr, char *our, int len,
1067                    int write, struct target_ops *target)
1068 {
1069   DWORD done;
1070   if (write)
1071     {
1072       DEBUG_MEM (("gdb: write target memory, %d bytes at 0x%08x\n",
1073                   len, memaddr));
1074       WriteProcessMemory (current_process_handle, (LPVOID) memaddr, our,
1075                           len, &done);
1076       FlushInstructionCache (current_process_handle, (LPCVOID) memaddr, len);
1077     }
1078   else
1079     {
1080       DEBUG_MEM (("gdb: read target memory, %d bytes at 0x%08x\n",
1081                   len, memaddr));
1082       ReadProcessMemory (current_process_handle, (LPCVOID) memaddr, our, len,
1083                          &done);
1084     }
1085   return done;
1086 }
1087
1088 void
1089 child_kill_inferior (void)
1090 {
1091   CHECK (TerminateProcess (current_process_handle, 0));
1092
1093   for (;;)
1094     {
1095       continue_status = DBG_CONTINUE;
1096       if (!child_continue (-1))
1097         break;
1098       if (!WaitForDebugEvent (&current_event, INFINITE))
1099         break;
1100       if (current_event.dwDebugEventCode == EXIT_PROCESS_DEBUG_EVENT)
1101         break;
1102     }
1103
1104   CHECK (CloseHandle (current_process_handle));
1105
1106   /* this may fail in an attached process so don't check. */
1107   (void) CloseHandle (current_thread->h);
1108   target_mourn_inferior ();     /* or just child_mourn_inferior? */
1109 }
1110
1111 void
1112 child_resume (int pid, int step, enum target_signal sig)
1113 {
1114   int i;
1115   thread_info *th;
1116
1117   DEBUG_EXEC (("gdb: child_resume (pid=%d, step=%d, sig=%d);\n",
1118                pid, step, sig));
1119
1120   /* Get context for currently selected thread */
1121   th = thread_rec (current_event.dwThreadId, FALSE);
1122   if (step)
1123     {
1124 #ifdef i386
1125       /* Single step by setting t bit */
1126       child_fetch_inferior_registers (PS_REGNUM);
1127       th->context.EFlags |= FLAG_TRACE_BIT;
1128 #endif
1129     }
1130
1131   if (th->context.ContextFlags)
1132     {
1133       CHECK (SetThreadContext (th->h, &th->context));
1134       th->context.ContextFlags = 0;
1135     }
1136
1137   /* Allow continuing with the same signal that interrupted us.
1138      Otherwise complain. */
1139
1140   child_continue (pid);
1141 }
1142
1143 static void
1144 child_prepare_to_store ()
1145 {
1146   /* Do nothing, since we can store individual regs */
1147 }
1148
1149 static int
1150 child_can_run ()
1151 {
1152   return 1;
1153 }
1154
1155 static void
1156 child_close ()
1157 {
1158   DEBUG_EVENTS (("gdb: child_close, inferior_pid=%d\n", inferior_pid));
1159 }
1160
1161 struct target_ops child_ops;
1162
1163 static void
1164 init_child_ops (void)
1165 {
1166   child_ops.to_shortname = "child";
1167   child_ops.to_longname = "Win32 child process";
1168   child_ops.to_doc = "Win32 child process (started by the \"run\" command).";
1169   child_ops.to_open = child_open;
1170   child_ops.to_close = child_close;
1171   child_ops.to_attach = child_attach;
1172   child_ops.to_detach = child_detach;
1173   child_ops.to_resume = child_resume;
1174   child_ops.to_wait = child_wait;
1175   child_ops.to_fetch_registers = child_fetch_inferior_registers;
1176   child_ops.to_store_registers = child_store_inferior_registers;
1177   child_ops.to_prepare_to_store = child_prepare_to_store;
1178   child_ops.to_xfer_memory = child_xfer_memory;
1179   child_ops.to_files_info = child_files_info;
1180   child_ops.to_insert_breakpoint = memory_insert_breakpoint;
1181   child_ops.to_remove_breakpoint = memory_remove_breakpoint;
1182   child_ops.to_terminal_init = terminal_init_inferior;
1183   child_ops.to_terminal_inferior = terminal_inferior;
1184   child_ops.to_terminal_ours_for_output = terminal_ours_for_output;
1185   child_ops.to_terminal_ours = terminal_ours;
1186   child_ops.to_terminal_info = child_terminal_info;
1187   child_ops.to_kill = child_kill_inferior;
1188   child_ops.to_load = 0;
1189   child_ops.to_lookup_symbol = 0;
1190   child_ops.to_create_inferior = child_create_inferior;
1191   child_ops.to_mourn_inferior = child_mourn_inferior;
1192   child_ops.to_can_run = child_can_run;
1193   child_ops.to_notice_signals = 0;
1194   child_ops.to_thread_alive = win32_child_thread_alive;
1195   child_ops.to_pid_to_str = cygwin_pid_to_str;
1196   child_ops.to_stop = child_stop;
1197   child_ops.to_stratum = process_stratum;
1198   child_ops.DONT_USE = 0;
1199   child_ops.to_has_all_memory = 1;
1200   child_ops.to_has_memory = 1;
1201   child_ops.to_has_stack = 1;
1202   child_ops.to_has_registers = 1;
1203   child_ops.to_has_execution = 1;
1204   child_ops.to_sections = 0;
1205   child_ops.to_sections_end = 0;
1206   child_ops.to_magic = OPS_MAGIC;
1207 }
1208
1209 void
1210 _initialize_inftarg ()
1211 {
1212   struct cmd_list_element *c;
1213   init_child_ops ();
1214
1215   add_show_from_set
1216     (add_set_cmd ("new-console", class_support, var_boolean,
1217                   (char *) &new_console,
1218                   "Set creation of new console when creating child process.",
1219                   &setlist),
1220      &showlist);
1221
1222   add_show_from_set
1223     (add_set_cmd ("new-group", class_support, var_boolean,
1224                   (char *) &new_group,
1225                   "Set creation of new group when creating child process.",
1226                   &setlist),
1227      &showlist);
1228
1229   add_show_from_set
1230     (add_set_cmd ("debugexec", class_support, var_boolean,
1231                   (char *) &debug_exec,
1232                   "Set whether to display execution in child process.",
1233                   &setlist),
1234      &showlist);
1235
1236   add_show_from_set
1237     (add_set_cmd ("debugevents", class_support, var_boolean,
1238                   (char *) &debug_events,
1239                   "Set whether to display kernel events in child process.",
1240                   &setlist),
1241      &showlist);
1242
1243   add_show_from_set
1244     (add_set_cmd ("debugmemory", class_support, var_boolean,
1245                   (char *) &debug_memory,
1246                   "Set whether to display memory accesses in child process.",
1247                   &setlist),
1248      &showlist);
1249
1250   add_show_from_set
1251     (add_set_cmd ("debugexceptions", class_support, var_boolean,
1252                   (char *) &debug_exceptions,
1253                "Set whether to display kernel exceptions in child process.",
1254                   &setlist),
1255      &showlist);
1256
1257   add_target (&child_ops);
1258 }
1259
1260 /* Determine if the thread referenced by "pid" is alive
1261    by "polling" it.  If WaitForSingleObject returns WAIT_OBJECT_0
1262    it means that the pid has died.  Otherwise it is assumed to be alive. */
1263 static int
1264 win32_child_thread_alive (int pid)
1265 {
1266   return WaitForSingleObject (thread_rec (pid, FALSE)->h, 0) == WAIT_OBJECT_0 ?
1267     FALSE : TRUE;
1268 }
1269
1270 /* Convert pid to printable format. */
1271 char *
1272 cygwin_pid_to_str (int pid)
1273 {
1274   static char buf[80];
1275   if (pid == current_event.dwProcessId)
1276     sprintf (buf, "process %d", pid);
1277   else
1278     sprintf (buf, "thread %d.0x%x", current_event.dwProcessId, pid);
1279   return buf;
1280 }