scheduler/sysdeps.c

   1 /*
   2  * System-dependent scheduler support
   3  *
   4  * Copyright 1998 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <signal.h>
  25 #include <stdio.h>
  26 #ifdef HAVE_UNISTD_H
  27 # include <unistd.h>
  28 #endif
  29 #ifdef HAVE_SYS_TIME_H
  30 # include <sys/time.h>
  31 #endif
  32 #ifdef HAVE_SYS_SYSCALL_H
  33 # include <sys/syscall.h>
  34 #endif
  35 #ifdef HAVE_SYS_LWP_H
  36 # include <sys/lwp.h>
  37 #endif
  38 #ifdef HAVE_UCONTEXT_H
  39 # include <ucontext.h>
  40 #endif
  41 #ifdef HAVE_SYS_MMAN_H
  42 #include <sys/mman.h>
  43 #endif
  44 #ifdef HAVE_SCHED_H
  45 #include <sched.h>
  46 #endif
  47
  48 #ifdef HAVE_NPTL
  49 #include <pthread.h>
  50 #endif
  51
  52 #include "thread.h"
  53 #include "wine/server.h"
  54 #include "winbase.h"
  55 #include "wine/winbase16.h"
  56 #include "wine/exception.h"
  57 #include "wine/library.h"
  58 #include "wine/debug.h"
  59
  60 WINE_DEFAULT_DEBUG_CHANNEL(thread);
  61
  62 struct thread_cleanup_info
  63 {
  64     void *stack_base;
  65     int   stack_size;
  66     int   status;
  67 };
  68
  69 /* temporary stacks used on thread exit */
  70 #define TEMP_STACK_SIZE 1024
  71 #define NB_TEMP_STACKS  8
  72 static char temp_stacks[NB_TEMP_STACKS][TEMP_STACK_SIZE];
  73 static LONG next_temp_stack;  /* next temp stack to use */
  74
  75 /***********************************************************************
  76  *           SYSDEPS_SetCurThread
  77  *
  78  * Make 'thread' the current thread.
  79  */
  80 void SYSDEPS_SetCurThread( TEB *teb )
  81 {
  82 #if defined(__i386__)
  83     /* On the i386, the current thread is in the %fs register */
  84     LDT_ENTRY fs_entry;
  85
  86     wine_ldt_set_base( &fs_entry, teb );
  87     wine_ldt_set_limit( &fs_entry, 0xfff );
  88     wine_ldt_set_flags( &fs_entry, WINE_LDT_FLAGS_DATA|WINE_LDT_FLAGS_32BIT );
  89     wine_ldt_init_fs( teb->teb_sel, &fs_entry );
  90 #elif defined(__powerpc__)
  91     /* On PowerPC, the current TEB is in the gpr13 register */
  92     __asm__ __volatile__("mr 2, %0" : : "r" (teb));
  93 #elif defined(HAVE__LWP_CREATE)
  94     /* On non-i386 Solaris, we use the LWP private pointer */
  95     _lwp_setprivate( teb );
  96 #endif
  97 }
  98
  99
 100 /***********************************************************************
 101  *           call_on_thread_stack
 102  *
 103  * Call a function once we switched to the thread stack.
 104  */
 105 static void call_on_thread_stack( void *func )
 106 {
 107     __TRY
 108     {
 109         void (*funcptr)(void) = func;
 110         funcptr();
 111     }
 112     __EXCEPT(UnhandledExceptionFilter)
 113     {
 114         TerminateThread( GetCurrentThread(), GetExceptionCode() );
 115     }
 116     __ENDTRY
 117     SYSDEPS_ExitThread(0);  /* should never get here */
 118 }
 119
 120
 121 /***********************************************************************
 122  *           get_temp_stack
 123  *
 124  * Get a temporary stack address to run the thread exit code on.
 125  */
 126 inline static char *get_temp_stack(void)
 127 {
 128     unsigned int next = InterlockedExchangeAdd( &next_temp_stack, 1 );
 129     return temp_stacks[next % NB_TEMP_STACKS];
 130 }
 131
 132
 133 /***********************************************************************
 134  *           cleanup_thread
 135  *
 136  * Cleanup the remains of a thread. Runs on a temporary stack.
 137  */
 138 static void cleanup_thread( void *ptr )
 139 {
 140     /* copy the info structure since it is on the stack we will free */
 141     struct thread_cleanup_info info = *(struct thread_cleanup_info *)ptr;
 142     munmap( info.stack_base, info.stack_size );
 143     wine_ldt_free_fs( wine_get_fs() );
 144 #ifdef HAVE__LWP_CREATE
 145     _lwp_exit();
 146 #endif
 147     _exit( info.status );
 148 }
 149
 150
 151 /***********************************************************************
 152  *           SYSDEPS_StartThread
 153  *
 154  * Startup routine for a new thread.
 155  */
 156 static void SYSDEPS_StartThread( TEB *teb )
 157 {
 158     SYSDEPS_SetCurThread( teb );
 159     SIGNAL_Init();
 160     CLIENT_InitThread();
 161     __TRY
 162     {
 163         teb->startup();
 164     }
 165     __EXCEPT(UnhandledExceptionFilter)
 166     {
 167         TerminateThread( GetCurrentThread(), GetExceptionCode() );
 168     }
 169     __ENDTRY
 170     SYSDEPS_ExitThread(0);  /* should never get here */
 171 }
 172
 173
 174 /***********************************************************************
 175  *           SYSDEPS_SpawnThread
 176  *
 177  * Start running a new thread.
 178  * Return -1 on error, 0 if OK.
 179  */
 180 int SYSDEPS_SpawnThread( TEB *teb )
 181 {
 182 #ifdef HAVE_NPTL
 183     pthread_t id;
 184     pthread_attr_t attr;
 185
 186     pthread_attr_init( &attr );
 187     pthread_attr_setdetachstate( &attr, PTHREAD_CREATE_DETACHED );
 188     pthread_attr_setstack( &attr, teb->stack_base, (char *)teb->stack_top - (char *)teb->stack_base );
 189     if (pthread_create( &id, &attr, (void * (*)(void *))SYSDEPS_StartThread, teb )) return -1;
 190     return 0;
 191 #elif defined(HAVE_CLONE)
 192     if (clone( (int (*)(void *))SYSDEPS_StartThread, teb->stack_top,
 193                CLONE_VM | CLONE_FS | CLONE_FILES | SIGCHLD, teb ) < 0)
 194         return -1;
 195     return 0;
 196 #elif defined(HAVE_RFORK)
 197     void **sp = (void **)teb->stack_top;
 198     *--sp = teb;
 199     *--sp = 0;
 200     *--sp = SYSDEPS_StartThread;
 201     __asm__ __volatile__(
 202     "pushl %2;\n\t"             /* flags */
 203     "pushl $0;\n\t"             /* 0 ? */
 204     "movl %1,%%eax;\n\t"        /* SYS_rfork */
 205     ".byte 0x9a; .long 0; .word 7;\n\t" /* lcall 7:0... FreeBSD syscall */
 206     "cmpl $0, %%edx;\n\t"
 207     "je 1f;\n\t"
 208     "movl %0,%%esp;\n\t"        /* child -> new thread */
 209     "ret;\n"
 210     "1:\n\t"            /* parent -> caller thread */
 211     "addl $8,%%esp" :
 212     : "r" (sp), "g" (SYS_rfork), "g" (RFPROC | RFMEM)
 213     : "eax", "edx");
 214     return 0;
 215 #elif defined(HAVE__LWP_CREATE)
 216     ucontext_t context;
 217     _lwp_makecontext( &context, (void(*)(void *))SYSDEPS_StartThread, teb,
 218                       NULL, teb->stack_base, (char *)teb->stack_top - (char *)teb->stack_base );
 219     if ( _lwp_create( &context, 0, NULL ) )
 220         return -1;
 221     return 0;
 222 #endif
 223
 224     FIXME("CreateThread: stub\n" );
 225     return -1;
 226 }
 227
 228
 229 /***********************************************************************
 230  *           SYSDEPS_CallOnStack
 231  */
 232 void DECLSPEC_NORETURN SYSDEPS_CallOnStack( void (*func)(LPVOID), LPVOID arg );
 233 #ifdef __i386__
 234 #  ifdef __GNUC__
 235 __ASM_GLOBAL_FUNC( SYSDEPS_CallOnStack,
 236                    "movl 4(%esp),%ecx\n\t"  /* func */
 237                    "movl 8(%esp),%edx\n\t"  /* arg */
 238                    ".byte 0x64\n\tmovl 0x04,%esp\n\t"  /* teb->stack_top */
 239                    "pushl %edx\n\t"
 240                    "xorl %ebp,%ebp\n\t"
 241                    "call *%ecx\n\t"
 242                    "int $3" /* we never return here */ );
 243 #  elif defined(_MSC_VER)
 244 __declspec(naked) void SYSDEPS_CallOnStack( void (*func)(LPVOID), LPVOID arg )
 245 {
 246   __asm mov ecx, 4[esp];
 247   __asm mov edx, 8[esp];
 248   __asm mov fs:[0x04], esp;
 249   __asm push edx;
 250   __asm xor ebp, ebp;
 251   __asm call [ecx];
 252   __asm int 3;
 253 }
 254 #  endif /* defined(__GNUC__) || defined(_MSC_VER) */
 255 #elif defined(__sparc__) && defined(__GNUC__)
 256 __ASM_GLOBAL_FUNC( SYSDEPS_CallOnStack,
 257                    "mov %o0, %l0\n\t" /* store first argument */
 258                    "call " __ASM_NAME("NtCurrentTeb") ", 0\n\t"
 259                    "mov %o1, %l1\n\t" /* delay slot: store second argument */
 260                    "ld [%o0+4], %sp\n\t" /* teb->stack_top */
 261                    "call %l0, 0\n\t" /* call func */
 262                    "mov %l1, %o0\n\t" /* delay slot:  arg for func */
 263                    "ta 0x01\n\t"); /* breakpoint - we never get here */
 264 #else /* !sparc, !i386 */
 265 void SYSDEPS_CallOnStack( void (*func)(LPVOID), LPVOID arg )
 266 {
 267     func( arg );
 268     while(1); /* avoid warning */
 269 }
 270 #endif /* !defined(__i386__) && !defined(__sparc__) */
 271
 272
 273 /***********************************************************************
 274  *           SYSDEPS_SwitchToThreadStack
 275  */
 276 void SYSDEPS_SwitchToThreadStack( void (*func)(void) )
 277 {
 278     SYSDEPS_CallOnStack( call_on_thread_stack, func );
 279 }
 280
 281
 282 /***********************************************************************
 283  *           SYSDEPS_ExitThread
 284  *
 285  * Exit a running thread; must not return.
 286  */
 287 void SYSDEPS_ExitThread( int status )
 288 {
 289     TEB *teb = NtCurrentTeb();
 290     struct thread_cleanup_info info;
 291     MEMORY_BASIC_INFORMATION meminfo;
 292
 293     wine_ldt_free_entries( teb->stack_sel, 1 );
 294     VirtualQuery( teb->stack_top, &meminfo, sizeof(meminfo) );
 295     info.stack_base = meminfo.AllocationBase;
 296     info.stack_size = meminfo.RegionSize + ((char *)teb->stack_top - (char *)meminfo.AllocationBase);
 297     info.status     = status;
 298
 299     SIGNAL_Block();
 300
 301 #ifdef HAVE_NPTL
 302     SYSDEPS_AbortThread( status );
 303 #else
 304     SIGNAL_Reset();
 305     VirtualFree( teb->stack_base, 0, MEM_RELEASE | MEM_SYSTEM );
 306     close( teb->wait_fd[0] );
 307     close( teb->wait_fd[1] );
 308     close( teb->reply_fd );
 309     close( teb->request_fd );
 310     teb->stack_low = get_temp_stack();
 311     teb->stack_top = (char *) teb->stack_low + TEMP_STACK_SIZE;
 312     SYSDEPS_CallOnStack( cleanup_thread, &info );
 313 #endif
 314 }
 315
 316
 317 /***********************************************************************
 318  *           SYSDEPS_AbortThread
 319  *
 320  * Same as SYSDEPS_ExitThread, but must not do anything that requires a server call.
 321  */
 322 void SYSDEPS_AbortThread( int status )
 323 {
 324     SIGNAL_Block();
 325     close( NtCurrentTeb()->wait_fd[0] );
 326     close( NtCurrentTeb()->wait_fd[1] );
 327     close( NtCurrentTeb()->reply_fd );
 328     close( NtCurrentTeb()->request_fd );
 329 #ifdef HAVE_NPTL
 330     pthread_exit( (void *)status );
 331 #endif
 332     SIGNAL_Reset();
 333 #ifdef HAVE__LWP_CREATE
 334     _lwp_exit();
 335 #endif
 336     for (;;)  /* avoid warning */
 337         _exit( status );
 338 }
 339
 340 /***********************************************************************
 341  *           SYSDEPS_GetUnixTid
 342  *
 343  * Get the Unix tid of the current thread.
 344  */
 345 int SYSDEPS_GetUnixTid(void)
 346 {
 347 #ifdef HAVE__LWP_SELF
 348     return _lwp_self();
 349 #elif defined(__linux__) && defined(__i386__)
 350     int ret;
 351     __asm__("int $0x80" : "=a" (ret) : "0" (224) /* SYS_gettid */);
 352     if (ret < 0) ret = -1;
 353     return ret;
 354 #else
 355     return -1;
 356 #endif
 357 }
 358
 359
 360 #ifndef HAVE_NPTL
 361
 362 /* default errno before threading is initialized */
 363 static int *default_errno_location(void)
 364 {
 365     static int static_errno;
 366     return &static_errno;
 367 }
 368
 369 /* default h_errno before threading is initialized */
 370 static int *default_h_errno_location(void)
 371 {
 372     static int static_h_errno;
 373     return &static_h_errno;
 374 }
 375
 376 /* errno once threading is working */
 377 static int *thread_errno_location(void)
 378 {
 379     return &NtCurrentTeb()->thread_errno;
 380 }
 381
 382 /* h_errno once threading is working */
 383 static int *thread_h_errno_location(void)
 384 {
 385     return &NtCurrentTeb()->thread_h_errno;
 386 }
 387
 388 static int* (*errno_location_ptr)(void) = default_errno_location;
 389 static int* (*h_errno_location_ptr)(void) = default_h_errno_location;
 390
 391 /***********************************************************************
 392  *           __errno_location/__error/__errno/___errno/__thr_errno
 393  *
 394  * Get the per-thread errno location.
 395  */
 396 int *__errno_location(void) { return errno_location_ptr(); }  /* Linux */
 397 int *__error(void)          { return errno_location_ptr(); }  /* FreeBSD */
 398 int *__errno(void)          { return errno_location_ptr(); }  /* NetBSD */
 399 int *___errno(void)         { return errno_location_ptr(); }  /* Solaris */
 400 int *__thr_errno(void)      { return errno_location_ptr(); }  /* UnixWare */
 401
 402 /***********************************************************************
 403  *           __h_errno_location
 404  *
 405  * Get the per-thread h_errno location.
 406  */
 407 int *__h_errno_location(void)
 408 {
 409     return h_errno_location_ptr();
 410 }
 411
 412 #endif  /* HAVE_NPTL */
 413
 414
 415 #if defined(__linux__) && defined(__i386__)
 416 static inline void writejump( const char *symbol, void *dest )
 417 {
 418     unsigned char *addr = wine_dlsym( RTLD_NEXT, symbol, NULL, 0 );
 419
 420     if (!addr) return;
 421
 422     /* write a relative jump at the function address */
 423     mprotect((void*)((unsigned int)addr & ~(getpagesize()-1)), 5, PROT_READ|PROT_EXEC|PROT_WRITE);
 424     addr[0] = 0xe9;
 425     *(int *)(addr+1) = (unsigned char *)dest - (addr + 5);
 426     mprotect((void*)((unsigned int)addr & ~(getpagesize()-1)), 5, PROT_READ|PROT_EXEC);
 427 }
 428 #endif
 429
 430 /***********************************************************************
 431  *           SYSDEPS_InitErrno
 432  *
 433  * Initialize errno handling.
 434  */
 435 void SYSDEPS_InitErrno(void)
 436 {
 437 #ifndef HAVE_NPTL
 438     errno_location_ptr = thread_errno_location;
 439     h_errno_location_ptr = thread_h_errno_location;
 440
 441 # if defined(__linux__) && defined(__i386__)
 442     writejump( "__errno_location", thread_errno_location );
 443     writejump( "__h_errno_location", thread_h_errno_location );
 444 # endif
 445 #endif  /* HAVE_NPTL */
 446 }
 447
 448
 449 /**********************************************************************
 450  *           NtCurrentTeb   (NTDLL.@)
 451  *
 452  * This will crash and burn if called before threading is initialized
 453  */
 454 #if defined(__i386__) && defined(__GNUC__)
 455 __ASM_GLOBAL_FUNC( NtCurrentTeb, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" );
 456 #elif defined(__i386__) && defined(_MSC_VER)
 457 /* Nothing needs to be done. MS C "magically" exports the inline version from winnt.h */
 458 #elif defined(HAVE__LWP_CREATE)
 459 /***********************************************************************
 460  *              NtCurrentTeb (NTDLL.@)
 461  */
 462 struct _TEB * WINAPI NtCurrentTeb(void)
 463 {
 464     extern void *_lwp_getprivate(void);
 465     return (struct _TEB *)_lwp_getprivate();
 466 }
 467 #elif defined(__powerpc__)
 468 __ASM_GLOBAL_FUNC( NtCurrentTeb, "\n\tmr 3,2\n\tblr" );
 469 #else
 470 # error NtCurrentTeb not defined for this architecture
 471 #endif  /* __i386__ */