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