server/mach.c

   1 /*
   2  * Server-side debugger support using Mach primitives
   3  *
   4  * Copyright (C) 1999, 2006 Alexandre Julliard
   5  * Copyright (C) 2006 Ken Thomases for CodeWeavers
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #include "config.h"
  23 #include "wine/port.h"
  24
  25 #include <assert.h>
  26 #include <errno.h>
  27 #include <stdio.h>
  28 #include <signal.h>
  29 #include <stdarg.h>
  30 #include <sys/types.h>
  31 #include <unistd.h>
  32 #ifdef HAVE_SYS_SYSCALL_H
  33 #include <sys/syscall.h>
  34 #endif
  35
  36 #include "ntstatus.h"
  37 #define WIN32_NO_STATUS
  38 #include "winternl.h"
  39
  40 #include "file.h"
  41 #include "process.h"
  42 #include "thread.h"
  43 #include "request.h"
  44
  45 #ifdef USE_MACH
  46
  47 #include <mach/mach.h>
  48 #include <mach/mach_error.h>
  49 #include <mach/thread_act.h>
  50 #include <mach/mach_vm.h>
  51 #include <servers/bootstrap.h>
  52
  53 static mach_port_t server_mach_port;
  54
  55 void sigchld_callback(void)
  56 {
  57     assert(0);  /* should never be called on MacOS */
  58 }
  59
  60 static void mach_set_error(kern_return_t mach_error)
  61 {
  62     switch (mach_error)
  63     {
  64         case KERN_SUCCESS:              break;
  65         case KERN_INVALID_ARGUMENT:     set_error(STATUS_INVALID_PARAMETER); break;
  66         case KERN_NO_SPACE:             set_error(STATUS_NO_MEMORY); break;
  67         case KERN_PROTECTION_FAILURE:   set_error(STATUS_ACCESS_DENIED); break;
  68         case KERN_INVALID_ADDRESS:      set_error(STATUS_ACCESS_VIOLATION); break;
  69         default:                        set_error(STATUS_UNSUCCESSFUL); break;
  70     }
  71 }
  72
  73 static mach_port_t get_process_port( struct process *process )
  74 {
  75     return process->trace_data;
  76 }
  77
  78 /* initialize the process control mechanism */
  79 void init_tracing_mechanism(void)
  80 {
  81     mach_port_t bp;
  82
  83     if (task_get_bootstrap_port(mach_task_self(), &bp) != KERN_SUCCESS)
  84         fatal_error("Can't find bootstrap port\n");
  85     if (mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &server_mach_port) != KERN_SUCCESS)
  86         fatal_error("Can't allocate port\n");
  87     if  (mach_port_insert_right( mach_task_self(),
  88                                  server_mach_port,
  89                                  server_mach_port,
  90                                  MACH_MSG_TYPE_MAKE_SEND ) != KERN_SUCCESS)
  91             fatal_error("Error inserting rights\n");
  92     if (bootstrap_register(bp, server_dir, server_mach_port) != KERN_SUCCESS)
  93         fatal_error("Can't check in server_mach_port\n");
  94     mach_port_deallocate(mach_task_self(), bp);
  95 }
  96
  97 /* initialize the per-process tracing mechanism */
  98 void init_process_tracing( struct process *process )
  99 {
 100     int pid, ret;
 101     struct
 102     {
 103         mach_msg_header_t           header;
 104         mach_msg_body_t             body;
 105         mach_msg_port_descriptor_t  task_port;
 106         mach_msg_trailer_t          trailer; /* only present on receive */
 107     } msg;
 108
 109     for (;;)
 110     {
 111         ret = mach_msg( &msg.header, MACH_RCV_MSG|MACH_RCV_TIMEOUT, 0, sizeof(msg),
 112                         server_mach_port, 0, 0 );
 113         if (ret)
 114         {
 115             if (ret != MACH_RCV_TIMED_OUT && debug_level)
 116                 fprintf( stderr, "warning: mach port receive failed with %x\n", ret );
 117             return;
 118         }
 119
 120         /* if anything in the message is invalid, ignore it */
 121         if (msg.header.msgh_size != offsetof(typeof(msg), trailer)) continue;
 122         if (msg.body.msgh_descriptor_count != 1) continue;
 123         if (msg.task_port.type != MACH_MSG_PORT_DESCRIPTOR) continue;
 124         if (msg.task_port.disposition != MACH_MSG_TYPE_PORT_SEND) continue;
 125         if (msg.task_port.name == MACH_PORT_NULL) continue;
 126         if (msg.task_port.name == MACH_PORT_DEAD) continue;
 127
 128         if (!pid_for_task( msg.task_port.name, &pid ))
 129         {
 130             struct thread *thread = get_thread_from_pid( pid );
 131
 132             if (thread && !thread->process->trace_data)
 133                 thread->process->trace_data = msg.task_port.name;
 134             else
 135                 mach_port_deallocate( mach_task_self(), msg.task_port.name );
 136         }
 137     }
 138 }
 139
 140 /* terminate the per-process tracing mechanism */
 141 void finish_process_tracing( struct process *process )
 142 {
 143     if (process->trace_data)
 144     {
 145         mach_port_deallocate( mach_task_self(), process->trace_data );
 146         process->trace_data = 0;
 147     }
 148 }
 149
 150 /* initialize registers in new thread if necessary */
 151 void init_thread_context( struct thread *thread )
 152 {
 153 }
 154
 155 /* retrieve the thread x86 registers */
 156 void get_thread_context( struct thread *thread, context_t *context, unsigned int flags )
 157 {
 158 #if defined(__i386__) || defined(__x86_64__)
 159     x86_debug_state_t state;
 160     mach_msg_type_number_t count = sizeof(state) / sizeof(int);
 161     mach_msg_type_name_t type;
 162     mach_port_t port, process_port = get_process_port( thread->process );
 163
 164     /* all other regs are handled on the client side */
 165     assert( flags == SERVER_CTX_DEBUG_REGISTERS );
 166
 167     if (thread->unix_pid == -1 || !process_port ||
 168         mach_port_extract_right( process_port, thread->unix_tid,
 169                                  MACH_MSG_TYPE_COPY_SEND, &port, &type ))
 170     {
 171         set_error( STATUS_ACCESS_DENIED );
 172         return;
 173     }
 174
 175     if (!thread_get_state( port, x86_DEBUG_STATE, (thread_state_t)&state, &count ))
 176     {
 177 #ifdef __x86_64__
 178         assert( state.dsh.flavor == x86_DEBUG_STATE32 ||
 179                 state.dsh.flavor == x86_DEBUG_STATE64 );
 180 #else
 181         assert( state.dsh.flavor == x86_DEBUG_STATE32 );
 182 #endif
 183
 184 #ifdef __x86_64__
 185         if (state.dsh.flavor == x86_DEBUG_STATE64)
 186         {
 187             context->debug.x86_64_regs.dr0 = state.uds.ds64.__dr0;
 188             context->debug.x86_64_regs.dr1 = state.uds.ds64.__dr1;
 189             context->debug.x86_64_regs.dr2 = state.uds.ds64.__dr2;
 190             context->debug.x86_64_regs.dr3 = state.uds.ds64.__dr3;
 191             context->debug.x86_64_regs.dr6 = state.uds.ds64.__dr6;
 192             context->debug.x86_64_regs.dr7 = state.uds.ds64.__dr7;
 193         }
 194         else
 195 #endif
 196         {
 197 /* work around silly renaming of struct members in OS X 10.5 */
 198 #if __DARWIN_UNIX03 && defined(_STRUCT_X86_DEBUG_STATE32)
 199             context->debug.i386_regs.dr0 = state.uds.ds32.__dr0;
 200             context->debug.i386_regs.dr1 = state.uds.ds32.__dr1;
 201             context->debug.i386_regs.dr2 = state.uds.ds32.__dr2;
 202             context->debug.i386_regs.dr3 = state.uds.ds32.__dr3;
 203             context->debug.i386_regs.dr6 = state.uds.ds32.__dr6;
 204             context->debug.i386_regs.dr7 = state.uds.ds32.__dr7;
 205 #else
 206             context->debug.i386_regs.dr0 = state.uds.ds32.dr0;
 207             context->debug.i386_regs.dr1 = state.uds.ds32.dr1;
 208             context->debug.i386_regs.dr2 = state.uds.ds32.dr2;
 209             context->debug.i386_regs.dr3 = state.uds.ds32.dr3;
 210             context->debug.i386_regs.dr6 = state.uds.ds32.dr6;
 211             context->debug.i386_regs.dr7 = state.uds.ds32.dr7;
 212 #endif
 213         }
 214         context->flags |= SERVER_CTX_DEBUG_REGISTERS;
 215     }
 216     mach_port_deallocate( mach_task_self(), port );
 217 #endif
 218 }
 219
 220 /* set the thread x86 registers */
 221 void set_thread_context( struct thread *thread, const context_t *context, unsigned int flags )
 222 {
 223 #if defined(__i386__) || defined(__x86_64__)
 224     x86_debug_state_t state;
 225     mach_msg_type_number_t count = sizeof(state) / sizeof(int);
 226     mach_msg_type_name_t type;
 227     mach_port_t port, process_port = get_process_port( thread->process );
 228     unsigned int dr7;
 229
 230     /* all other regs are handled on the client side */
 231     assert( flags == SERVER_CTX_DEBUG_REGISTERS );
 232
 233     if (thread->unix_pid == -1 || !process_port ||
 234         mach_port_extract_right( process_port, thread->unix_tid,
 235                                  MACH_MSG_TYPE_COPY_SEND, &port, &type ))
 236     {
 237         set_error( STATUS_ACCESS_DENIED );
 238         return;
 239     }
 240
 241
 242 #ifdef __x86_64__
 243     if (thread->process->cpu == CPU_x86_64)
 244     {
 245         /* Mac OS doesn't allow setting the global breakpoint flags */
 246         dr7 = (context->debug.x86_64_regs.dr7 & ~0xaa) | ((context->debug.x86_64_regs.dr7 & 0xaa) >> 1);
 247
 248         state.dsh.flavor = x86_DEBUG_STATE64;
 249         state.dsh.count = sizeof(state.uds.ds64) / sizeof(int);
 250         state.uds.ds64.__dr0 = context->debug.x86_64_regs.dr0;
 251         state.uds.ds64.__dr1 = context->debug.x86_64_regs.dr1;
 252         state.uds.ds64.__dr2 = context->debug.x86_64_regs.dr2;
 253         state.uds.ds64.__dr3 = context->debug.x86_64_regs.dr3;
 254         state.uds.ds64.__dr4 = 0;
 255         state.uds.ds64.__dr5 = 0;
 256         state.uds.ds64.__dr6 = context->debug.x86_64_regs.dr6;
 257         state.uds.ds64.__dr7 = dr7;
 258     }
 259     else
 260 #endif
 261     {
 262         dr7 = (context->debug.i386_regs.dr7 & ~0xaa) | ((context->debug.i386_regs.dr7 & 0xaa) >> 1);
 263
 264         state.dsh.flavor = x86_DEBUG_STATE32;
 265         state.dsh.count = sizeof(state.uds.ds32) / sizeof(int);
 266 #if __DARWIN_UNIX03 && defined(_STRUCT_X86_DEBUG_STATE32)
 267         state.uds.ds32.__dr0 = context->debug.i386_regs.dr0;
 268         state.uds.ds32.__dr1 = context->debug.i386_regs.dr1;
 269         state.uds.ds32.__dr2 = context->debug.i386_regs.dr2;
 270         state.uds.ds32.__dr3 = context->debug.i386_regs.dr3;
 271         state.uds.ds32.__dr4 = 0;
 272         state.uds.ds32.__dr5 = 0;
 273         state.uds.ds32.__dr6 = context->debug.i386_regs.dr6;
 274         state.uds.ds32.__dr7 = dr7;
 275 #else
 276         state.uds.ds32.dr0 = context->debug.i386_regs.dr0;
 277         state.uds.ds32.dr1 = context->debug.i386_regs.dr1;
 278         state.uds.ds32.dr2 = context->debug.i386_regs.dr2;
 279         state.uds.ds32.dr3 = context->debug.i386_regs.dr3;
 280         state.uds.ds32.dr4 = 0;
 281         state.uds.ds32.dr5 = 0;
 282         state.uds.ds32.dr6 = context->debug.i386_regs.dr6;
 283         state.uds.ds32.dr7 = dr7;
 284 #endif
 285     }
 286     thread_set_state( port, x86_DEBUG_STATE, (thread_state_t)&state, count );
 287     mach_port_deallocate( mach_task_self(), port );
 288 #endif
 289 }
 290
 291 int send_thread_signal( struct thread *thread, int sig )
 292 {
 293     int ret = -1;
 294     mach_port_t process_port = get_process_port( thread->process );
 295
 296     if (thread->unix_pid != -1 && process_port)
 297     {
 298         mach_msg_type_name_t type;
 299         mach_port_t port;
 300
 301         if (!mach_port_extract_right( process_port, thread->unix_tid,
 302                                       MACH_MSG_TYPE_COPY_SEND, &port, &type ))
 303         {
 304             ret = syscall( SYS___pthread_kill, port, sig );
 305             mach_port_deallocate( mach_task_self(), port );
 306         }
 307         else errno = ESRCH;
 308
 309         if (ret == -1 && errno == ESRCH) /* thread got killed */
 310         {
 311             thread->unix_pid = -1;
 312             thread->unix_tid = -1;
 313         }
 314     }
 315     if (debug_level && ret != -1)
 316         fprintf( stderr, "%04x: *sent signal* signal=%d\n", thread->id, sig );
 317     return (ret != -1);
 318 }
 319
 320 /* read data from a process memory space */
 321 int read_process_memory( struct process *process, client_ptr_t ptr, data_size_t size, char *dest )
 322 {
 323     kern_return_t ret;
 324     mach_msg_type_number_t bytes_read;
 325     mach_vm_offset_t offset;
 326     vm_offset_t data;
 327     mach_vm_address_t aligned_address;
 328     mach_vm_size_t aligned_size;
 329     unsigned int page_size = get_page_size();
 330     mach_port_t process_port = get_process_port( process );
 331
 332     if (!process_port)
 333     {
 334         set_error( STATUS_ACCESS_DENIED );
 335         return 0;
 336     }
 337     if ((mach_vm_address_t)ptr != ptr)
 338     {
 339         set_error( STATUS_ACCESS_DENIED );
 340         return 0;
 341     }
 342
 343     if ((ret = task_suspend( process_port )) != KERN_SUCCESS)
 344     {
 345         mach_set_error( ret );
 346         return 0;
 347     }
 348
 349     offset = ptr % page_size;
 350     aligned_address = (mach_vm_address_t)(ptr - offset);
 351     aligned_size = (size + offset + page_size - 1) / page_size * page_size;
 352
 353     ret = mach_vm_read( process_port, aligned_address, aligned_size, &data, &bytes_read );
 354     if (ret != KERN_SUCCESS) mach_set_error( ret );
 355     else
 356     {
 357         memcpy( dest, (char *)data + offset, size );
 358         mach_vm_deallocate( mach_task_self(), data, bytes_read );
 359     }
 360     task_resume( process_port );
 361     return (ret == KERN_SUCCESS);
 362 }
 363
 364 /* write data to a process memory space */
 365 int write_process_memory( struct process *process, client_ptr_t ptr, data_size_t size, const char *src )
 366 {
 367     kern_return_t ret;
 368     mach_vm_address_t aligned_address, region_address;
 369     mach_vm_size_t aligned_size, region_size;
 370     mach_msg_type_number_t info_size, bytes_read;
 371     mach_vm_offset_t offset;
 372     vm_offset_t task_mem = 0;
 373     struct vm_region_basic_info_64 info;
 374     mach_port_t dummy;
 375     unsigned int page_size = get_page_size();
 376     mach_port_t process_port = get_process_port( process );
 377
 378     if (!process_port)
 379     {
 380         set_error( STATUS_ACCESS_DENIED );
 381         return 0;
 382     }
 383     if ((mach_vm_address_t)ptr != ptr)
 384     {
 385         set_error( STATUS_ACCESS_DENIED );
 386         return 0;
 387     }
 388
 389     offset = ptr % page_size;
 390     aligned_address = (mach_vm_address_t)(ptr - offset);
 391     aligned_size = (size + offset + page_size - 1) / page_size * page_size;
 392
 393     if ((ret = task_suspend( process_port )) != KERN_SUCCESS)
 394     {
 395         mach_set_error( ret );
 396         return 0;
 397     }
 398
 399     ret = mach_vm_read( process_port, aligned_address, aligned_size, &task_mem, &bytes_read );
 400     if (ret != KERN_SUCCESS)
 401     {
 402         mach_set_error( ret );
 403         goto failed;
 404     }
 405     region_address = aligned_address;
 406     info_size = sizeof(info);
 407     ret = mach_vm_region( process_port, &region_address, &region_size, VM_REGION_BASIC_INFO_64,
 408                      (vm_region_info_t)&info, &info_size, &dummy );
 409     if (ret != KERN_SUCCESS)
 410     {
 411         mach_set_error( ret );
 412         goto failed;
 413     }
 414     if (region_address > aligned_address ||
 415         region_address + region_size < aligned_address + aligned_size)
 416     {
 417         /* FIXME: should support multiple regions */
 418         set_error( ERROR_ACCESS_DENIED );
 419         goto failed;
 420     }
 421     ret = mach_vm_protect( process_port, aligned_address, aligned_size, 0, VM_PROT_READ | VM_PROT_WRITE );
 422     if (ret != KERN_SUCCESS)
 423     {
 424         mach_set_error( ret );
 425         goto failed;
 426     }
 427
 428     /* FIXME: there's an optimization that can be made: check first and last */
 429     /* pages for writability; read first and last pages; write interior */
 430     /* pages to task without ever reading&modifying them; if that succeeds, */
 431     /* modify first and last pages and write them. */
 432
 433     memcpy( (char*)task_mem + offset, src, size );
 434
 435     ret = mach_vm_write( process_port, aligned_address, task_mem, bytes_read );
 436     if (ret != KERN_SUCCESS) mach_set_error( ret );
 437     else
 438     {
 439         mach_vm_deallocate( mach_task_self(), task_mem, bytes_read );
 440         /* restore protection */
 441         mach_vm_protect( process_port, aligned_address, aligned_size, 0, info.protection );
 442         task_resume( process_port );
 443         return 1;
 444     }
 445
 446 failed:
 447     if (task_mem) mach_vm_deallocate( mach_task_self(), task_mem, bytes_read );
 448     task_resume( process_port );
 449     return 0;
 450 }
 451
 452 /* retrieve an LDT selector entry */
 453 void get_selector_entry( struct thread *thread, int entry, unsigned int *base,
 454                          unsigned int *limit, unsigned char *flags )
 455 {
 456     const unsigned int total_size = (2 * sizeof(int) + 1) * 8192;
 457     struct process *process = thread->process;
 458     unsigned int page_size = get_page_size();
 459     vm_offset_t data;
 460     kern_return_t ret;
 461     mach_msg_type_number_t bytes_read;
 462     mach_port_t process_port = get_process_port( thread->process );
 463
 464     if (!process->ldt_copy || !process_port)
 465     {
 466         set_error( STATUS_ACCESS_DENIED );
 467         return;
 468     }
 469     if (entry >= 8192)
 470     {
 471         set_error( STATUS_INVALID_PARAMETER );  /* FIXME */
 472         return;
 473     }
 474
 475     if ((ret = task_suspend( process_port )) == KERN_SUCCESS)
 476     {
 477         mach_vm_offset_t offset = process->ldt_copy % page_size;
 478         mach_vm_address_t aligned_address = (mach_vm_address_t)(process->ldt_copy - offset);
 479         mach_vm_size_t aligned_size = (total_size + offset + page_size - 1) / page_size * page_size;
 480
 481         ret = mach_vm_read( process_port, aligned_address, aligned_size, &data, &bytes_read );
 482         if (ret != KERN_SUCCESS) mach_set_error( ret );
 483         else
 484         {
 485             const int *ldt = (const int *)((char *)data + offset);
 486             memcpy( base, ldt + entry, sizeof(int) );
 487             memcpy( limit, ldt + entry + 8192, sizeof(int) );
 488             memcpy( flags, (char *)(ldt + 2 * 8192) + entry, 1 );
 489             mach_vm_deallocate( mach_task_self(), data, bytes_read );
 490         }
 491         task_resume( process_port );
 492     }
 493     else mach_set_error( ret );
 494 }
 495
 496 #endif  /* USE_MACH */