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 #include "thread.h"
  45 #include "wine/server.h"
  46 #include "winbase.h"
  47 #include "wine/winbase16.h"
  48 #include "wine/exception.h"
  49 #include "wine/library.h"
  50 #include "wine/debug.h"
  51
  52 WINE_DEFAULT_DEBUG_CHANNEL(thread);
  53
  54 #if defined(linux) || defined(HAVE_CLONE)
  55 # ifdef HAVE_SCHED_H
  56 #  include <sched.h>
  57 # endif
  58 # ifndef CLONE_VM
  59 #  define CLONE_VM      0x00000100
  60 #  define CLONE_FS      0x00000200
  61 #  define CLONE_FILES   0x00000400
  62 #  define CLONE_SIGHAND 0x00000800
  63 #  define CLONE_PID     0x00001000
  64 # endif  /* CLONE_VM */
  65 #endif  /* linux || HAVE_CLONE */
  66
  67 struct thread_cleanup_info
  68 {
  69     void *stack_base;
  70     int   stack_size;
  71     int   status;
  72 };
  73
  74 /* temporary stacks used on thread exit */
  75 #define TEMP_STACK_SIZE 1024
  76 #define NB_TEMP_STACKS  8
  77 static char temp_stacks[NB_TEMP_STACKS][TEMP_STACK_SIZE];
  78 static LONG next_temp_stack;  /* next temp stack to use */
  79
  80 /***********************************************************************
  81  *           SYSDEPS_SetCurThread
  82  *
  83  * Make 'thread' the current thread.
  84  */
  85 void SYSDEPS_SetCurThread( TEB *teb )
  86 {
  87 #if defined(__i386__)
  88     /* On the i386, the current thread is in the %fs register */
  89     LDT_ENTRY fs_entry;
  90
  91     wine_ldt_set_base( &fs_entry, teb );
  92     wine_ldt_set_limit( &fs_entry, 0xfff );
  93     wine_ldt_set_flags( &fs_entry, WINE_LDT_FLAGS_DATA|WINE_LDT_FLAGS_32BIT );
  94     wine_ldt_init_fs( teb->teb_sel, &fs_entry );
  95     teb->gs_sel = wine_get_gs();
  96 #elif defined(__powerpc__)
  97     /* On PowerPC, the current TEB is in the gpr13 register */
  98     __asm__ __volatile__("mr 2, %0" : : "r" (teb));
  99 #elif defined(HAVE__LWP_CREATE)
 100     /* On non-i386 Solaris, we use the LWP private pointer */
 101     _lwp_setprivate( teb );
 102 #endif
 103 }
 104
 105
 106 /***********************************************************************
 107  *           call_on_thread_stack
 108  *
 109  * Call a function once we switched to the thread stack.
 110  */
 111 static void call_on_thread_stack( void *func )
 112 {
 113     __TRY
 114     {
 115         void (*funcptr)(void) = func;
 116         funcptr();
 117     }
 118     __EXCEPT(UnhandledExceptionFilter)
 119     {
 120         TerminateThread( GetCurrentThread(), GetExceptionCode() );
 121     }
 122     __ENDTRY
 123     SYSDEPS_ExitThread(0);  /* should never get here */
 124 }
 125
 126
 127 /***********************************************************************
 128  *           get_temp_stack
 129  *
 130  * Get a temporary stack address to run the thread exit code on.
 131  */
 132 inline static char *get_temp_stack(void)
 133 {
 134     unsigned int next = InterlockedExchangeAdd( &next_temp_stack, 1 );
 135     return temp_stacks[next % NB_TEMP_STACKS];
 136 }
 137
 138
 139 /***********************************************************************
 140  *           cleanup_thread
 141  *
 142  * Cleanup the remains of a thread. Runs on a temporary stack.
 143  */
 144 static void cleanup_thread( void *ptr )
 145 {
 146     /* copy the info structure since it is on the stack we will free */
 147     struct thread_cleanup_info info = *(struct thread_cleanup_info *)ptr;
 148     munmap( info.stack_base, info.stack_size );
 149     wine_ldt_free_fs( wine_get_fs() );
 150 #ifdef HAVE__LWP_CREATE
 151     _lwp_exit();
 152 #endif
 153     _exit( info.status );
 154 }
 155
 156
 157 /***********************************************************************
 158  *           SYSDEPS_StartThread
 159  *
 160  * Startup routine for a new thread.
 161  */
 162 static void SYSDEPS_StartThread( TEB *teb )
 163 {
 164     SYSDEPS_SetCurThread( teb );
 165     CLIENT_InitThread();
 166     SIGNAL_Init();
 167     __TRY
 168     {
 169         teb->startup();
 170     }
 171     __EXCEPT(UnhandledExceptionFilter)
 172     {
 173         TerminateThread( GetCurrentThread(), GetExceptionCode() );
 174     }
 175     __ENDTRY
 176     SYSDEPS_ExitThread(0);  /* should never get here */
 177 }
 178
 179
 180 /***********************************************************************
 181  *           SYSDEPS_SpawnThread
 182  *
 183  * Start running a new thread.
 184  * Return -1 on error, 0 if OK.
 185  */
 186 int SYSDEPS_SpawnThread( TEB *teb )
 187 {
 188 #ifdef ERRNO_LOCATION
 189
 190 #if defined(linux) || defined(HAVE_CLONE)
 191     const int flags = CLONE_VM | CLONE_FS | CLONE_FILES | SIGCHLD;
 192     if (clone( (int (*)(void *))SYSDEPS_StartThread, teb->stack_top, flags, teb ) < 0)
 193         return -1;
 194     if (!(flags & CLONE_FILES)) close( teb->request_fd );  /* close the child socket in the parent */
 195     return 0;
 196 #endif
 197
 198 #ifdef HAVE_RFORK
 199     const int flags = RFPROC | RFMEM; /*|RFFDG*/
 200     void **sp = (void **)teb->stack_top;
 201     *--sp = teb;
 202     *--sp = 0;
 203     *--sp = SYSDEPS_StartThread;
 204     __asm__ __volatile__(
 205     "pushl %2;\n\t"             /* flags */
 206     "pushl $0;\n\t"             /* 0 ? */
 207     "movl %1,%%eax;\n\t"        /* SYS_rfork */
 208     ".byte 0x9a; .long 0; .word 7;\n\t" /* lcall 7:0... FreeBSD syscall */
 209     "cmpl $0, %%edx;\n\t"
 210     "je 1f;\n\t"
 211     "movl %0,%%esp;\n\t"        /* child -> new thread */
 212     "ret;\n"
 213     "1:\n\t"            /* parent -> caller thread */
 214     "addl $8,%%esp" :
 215     : "r" (sp), "g" (SYS_rfork), "g" (flags)
 216     : "eax", "edx");
 217     if (flags & RFFDG) close( teb->request_fd );  /* close the child socket in the parent */
 218     return 0;
 219 #endif
 220
 221 #ifdef HAVE__LWP_CREATE
 222     ucontext_t context;
 223     _lwp_makecontext( &context, (void(*)(void *))SYSDEPS_StartThread, teb,
 224                       NULL, teb->stack_base, (char *)teb->stack_top - (char *)teb->stack_base );
 225     if ( _lwp_create( &context, 0, NULL ) )
 226         return -1;
 227     return 0;
 228 #endif
 229
 230 #endif /* ERRNO_LOCATION */
 231
 232     FIXME("CreateThread: stub\n" );
 233     return 0;
 234 }
 235
 236
 237 /***********************************************************************
 238  *           SYSDEPS_CallOnStack
 239  */
 240 void DECLSPEC_NORETURN SYSDEPS_CallOnStack( void (*func)(LPVOID), LPVOID arg );
 241 #ifdef __i386__
 242 #  ifdef __GNUC__
 243 __ASM_GLOBAL_FUNC( SYSDEPS_CallOnStack,
 244                    "movl 4(%esp),%ecx\n\t"  /* func */
 245                    "movl 8(%esp),%edx\n\t"  /* arg */
 246                    ".byte 0x64\n\tmovl 0x04,%esp\n\t"  /* teb->stack_top */
 247                    "pushl %edx\n\t"
 248                    "xorl %ebp,%ebp\n\t"
 249                    "call *%ecx\n\t"
 250                    "int $3" /* we never return here */ );
 251 #  elif defined(_MSC_VER)
 252 __declspec(naked) void SYSDEPS_CallOnStack( void (*func)(LPVOID), LPVOID arg )
 253 {
 254   __asm mov ecx, 4[esp];
 255   __asm mov edx, 8[esp];
 256   __asm mov fs:[0x04], esp;
 257   __asm push edx;
 258   __asm xor ebp, ebp;
 259   __asm call [ecx];
 260   __asm int 3;
 261 }
 262 #  endif /* defined(__GNUC__) || defined(_MSC_VER) */
 263 #elif defined(__sparc__) && defined(__GNUC__)
 264 __ASM_GLOBAL_FUNC( SYSDEPS_CallOnStack,
 265                    "mov %o0, %l0\n\t" /* store first argument */
 266                    "call " __ASM_NAME("NtCurrentTeb") ", 0\n\t"
 267                    "mov %o1, %l1\n\t" /* delay slot: store second argument */
 268                    "ld [%o0+4], %sp\n\t" /* teb->stack_top */
 269                    "call %l0, 0\n\t" /* call func */
 270                    "mov %l1, %o0\n\t" /* delay slot:  arg for func */
 271                    "ta 0x01\n\t"); /* breakpoint - we never get here */
 272 #else /* !sparc, !i386 */
 273 void SYSDEPS_CallOnStack( void (*func)(LPVOID), LPVOID arg )
 274 {
 275     func( arg );
 276     while(1); /* avoid warning */
 277 }
 278 #endif /* !defined(__i386__) && !defined(__sparc__) */
 279
 280
 281 /***********************************************************************
 282  *           SYSDEPS_SwitchToThreadStack
 283  */
 284 void SYSDEPS_SwitchToThreadStack( void (*func)(void) )
 285 {
 286     SYSDEPS_CallOnStack( call_on_thread_stack, func );
 287 }
 288
 289
 290 /***********************************************************************
 291  *           SYSDEPS_ExitThread
 292  *
 293  * Exit a running thread; must not return.
 294  */
 295 void SYSDEPS_ExitThread( int status )
 296 {
 297     TEB *teb = NtCurrentTeb();
 298     struct thread_cleanup_info info;
 299     MEMORY_BASIC_INFORMATION meminfo;
 300
 301     wine_ldt_free_entries( teb->stack_sel, 1 );
 302     VirtualQuery( teb->stack_top, &meminfo, sizeof(meminfo) );
 303     info.stack_base = meminfo.AllocationBase;
 304     info.stack_size = meminfo.RegionSize + ((char *)teb->stack_top - (char *)meminfo.AllocationBase);
 305     info.status     = status;
 306
 307     SIGNAL_Reset();
 308
 309     VirtualFree( teb->stack_base, 0, MEM_RELEASE | MEM_SYSTEM );
 310     close( teb->wait_fd[0] );
 311     close( teb->wait_fd[1] );
 312     close( teb->reply_fd );
 313     close( teb->request_fd );
 314     teb->stack_low = get_temp_stack();
 315     teb->stack_top = (char *) teb->stack_low + TEMP_STACK_SIZE;
 316     SYSDEPS_CallOnStack( cleanup_thread, &info );
 317 }
 318
 319
 320 /***********************************************************************
 321  *           SYSDEPS_AbortThread
 322  *
 323  * Same as SYSDEPS_ExitThread, but must not do anything that requires a server call.
 324  */
 325 void SYSDEPS_AbortThread( int status )
 326 {
 327     SIGNAL_Reset();
 328     close( NtCurrentTeb()->wait_fd[0] );
 329     close( NtCurrentTeb()->wait_fd[1] );
 330     close( NtCurrentTeb()->reply_fd );
 331     close( NtCurrentTeb()->request_fd );
 332 #ifdef HAVE__LWP_CREATE
 333     _lwp_exit();
 334 #endif
 335     for (;;)  /* avoid warning */
 336         _exit( status );
 337 }
 338
 339
 340 /**********************************************************************
 341  *           NtCurrentTeb   (NTDLL.@)
 342  *
 343  * This will crash and burn if called before threading is initialized
 344  */
 345 #if defined(__i386__) && defined(__GNUC__)
 346 __ASM_GLOBAL_FUNC( NtCurrentTeb, ".byte 0x64\n\tmovl 0x18,%eax\n\tret" );
 347 #elif defined(__i386__) && defined(_MSC_VER)
 348 /* Nothing needs to be done. MS C "magically" exports the inline version from winnt.h */
 349 #elif defined(HAVE__LWP_CREATE)
 350 /***********************************************************************
 351  *              NtCurrentTeb (NTDLL.@)
 352  */
 353 struct _TEB * WINAPI NtCurrentTeb(void)
 354 {
 355     extern void *_lwp_getprivate(void);
 356     return (struct _TEB *)_lwp_getprivate();
 357 }
 358 #elif defined(__powerpc__)
 359 __ASM_GLOBAL_FUNC( NtCurrentTeb, "\n\tmr 3,2\n\tblr" );
 360 #else
 361 # error NtCurrentTeb not defined for this architecture
 362 #endif  /* __i386__ */