loader/signal.c

   1 /*
   2  * Wine signal handling
   3  *
   4  * Copyright 1995 Alexandre Julliard
   5  */
   6
   7 #include "config.h"
   8
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <signal.h>
  12 #include <string.h>
  13 #include <errno.h>
  14 #include <time.h>
  15 #include <setjmp.h>
  16
  17 #include <sys/time.h>
  18 #include <sys/timeb.h>
  19 #include <sys/types.h>
  20 #include <sys/wait.h>
  21
  22 #ifdef HAVE_SYS_PARAM_H
  23 # include <sys/param.h>
  24 #endif
  25 #ifdef HAVE_SYSCALL_H
  26 # include <syscall.h>
  27 #else
  28 # ifdef HAVE_SYS_SYSCALL_H
  29 #  include <sys/syscall.h>
  30 # endif
  31 #endif
  32
  33 #include "winsock.h"
  34 #include "global.h"
  35 #include "options.h"
  36 #include "debugger.h"
  37 #include "miscemu.h"
  38 #include "dosexe.h"
  39 #include "thread.h"
  40 #include "debug.h"
  41
  42 void (*fnWINE_Debugger)(int,SIGCONTEXT*) = NULL;
  43 void (*ctx_debug_call)(int sig,CONTEXT*ctx)=NULL;
  44 BOOL (*fnINSTR_EmulateInstruction)(SIGCONTEXT*ctx)=NULL;
  45
  46 #ifdef __i386__
  47
  48 /* i386 specific faults */
  49 static const char * const SIGNAL_traps[] =
  50 {
  51     "Division by zero exception",      /* 0 */
  52     "Debug exception",                 /* 1 */
  53     "NMI interrupt",                   /* 2 */
  54     "Breakpoint exception",            /* 3 */
  55     "Overflow exception",              /* 4 */
  56     "Bound range exception",           /* 5 */
  57     "Invalid opcode exception",        /* 6 */
  58     "Device not available exception",  /* 7 */
  59     "Double fault exception",          /* 8 */
  60     "Coprocessor segment overrun",     /* 9 */
  61     "Invalid TSS exception",           /* 10 */
  62     "Segment not present exception",   /* 11 */
  63     "Stack fault",                     /* 12 */
  64     "General protection fault",        /* 13 */
  65     "Page fault",                      /* 14 */
  66     "Unknown exception",               /* 15 */
  67     "Floating point exception",        /* 16 */
  68     "Alignment check exception",       /* 17 */
  69     "Machine check exception"          /* 18 */
  70 };
  71 #define NB_TRAPS  (sizeof(SIGNAL_traps) / sizeof(SIGNAL_traps[0]))
  72 #endif
  73
  74 /* Linux sigaction function */
  75
  76 #if defined(linux) && defined(__i386__)
  77 /* This is the sigaction structure from the Linux 2.1.20 kernel.  */
  78 #undef sa_handler
  79 struct kernel_sigaction
  80 {
  81     void (*sa_handler)();
  82     unsigned long sa_mask;
  83     unsigned long sa_flags;
  84     void (*sa_restorer)();
  85 };
  86
  87 /* Similar to the sigaction function in libc, except it leaves alone the
  88    restorer field, which is used to specify the signal stack address */
  89 static __inline__ int wine_sigaction( int sig, struct kernel_sigaction *new,
  90                                       struct kernel_sigaction *old )
  91 {
  92 #ifdef __PIC__
  93     __asm__ __volatile__( "pushl %%ebx\n\t"
  94                           "movl %2,%%ebx\n\t"
  95                           "int $0x80\n\t"
  96                           "popl %%ebx"
  97                           : "=a" (sig)
  98                           : "0" (SYS_sigaction),
  99                             "r" (sig),
 100                             "c" (new),
 101                             "d" (old) );
 102 #else
 103     __asm__ __volatile__( "int $0x80"
 104                           : "=a" (sig)
 105                           : "0" (SYS_sigaction),
 106                             "b" (sig),
 107                             "c" (new),
 108                             "d" (old) );
 109 #endif  /* __PIC__ */
 110     if (sig>=0)
 111         return 0;
 112     errno = -sig;
 113     return -1;
 114 }
 115 #endif /* linux && __i386__ */
 116
 117 /* Signal stack */
 118
 119 static char SIGNAL_Stack[16384];
 120 static sigset_t async_signal_set;
 121
 122 /**********************************************************************
 123  *              SIGNAL_child
 124  *
 125  * wait4 terminated child processes
 126  */
 127 static HANDLER_DEF(SIGNAL_child)
 128 {
 129     HANDLER_INIT();
 130 #ifdef HAVE_WAIT4
 131     wait4( 0, NULL, WNOHANG, NULL);
 132 #elif defined (HAVE_WAITPID)
 133     /* I am sort-of guessing that this is the same as the wait4 call.  */
 134     waitpid (0, NULL, WNOHANG);
 135 #else
 136     wait(NULL);
 137 #endif
 138 }
 139
 140
 141 /**********************************************************************
 142  *              SIGNAL_SetHandler
 143  */
 144 void SIGNAL_SetHandler( int sig, void (*func)(), int flags )
 145 {
 146     int ret;
 147
 148 #if defined(linux) && defined(__i386__)
 149
 150     struct kernel_sigaction sig_act;
 151     sig_act.sa_handler = func;
 152     sig_act.sa_flags   = SA_RESTART | (flags) ? SA_NOMASK : 0;
 153     sig_act.sa_mask    = 0;
 154     /* Point to the top of the stack, minus 4 just in case, and make
 155        it aligned  */
 156     sig_act.sa_restorer =
 157         (void (*)())((int)(SIGNAL_Stack + sizeof(SIGNAL_Stack) - 4) & ~3);
 158     ret = wine_sigaction( sig, &sig_act, NULL );
 159
 160 #else  /* linux && __i386__ */
 161
 162     struct sigaction sig_act;
 163     sig_act.sa_handler = func;
 164     sigemptyset( &sig_act.sa_mask );
 165
 166 # if defined(__NetBSD__) || defined(__FreeBSD__) || defined(__OpenBSD__)
 167     sig_act.sa_flags = SA_ONSTACK;
 168 # elif defined (__svr4__) || defined(_SCO_DS)
 169     sig_act.sa_flags = SA_SIGINFO | SA_ONSTACK | SA_RESTART;
 170 # elif defined(__EMX__)
 171     sig_act.sa_flags = 0; /* FIXME: EMX has only SA_ACK and SA_SYSV */
 172 # else
 173     sig_act.sa_flags = 0;
 174 # endif
 175     ret = sigaction( sig, &sig_act, NULL );
 176
 177 #endif  /* linux && __i386__ */
 178
 179     if (ret < 0)
 180     {
 181         perror( "sigaction" );
 182         exit(1);
 183     }
 184 }
 185
 186 extern void stop_wait(int a);
 187 extern void WINSOCK_sigio(int a);
 188 extern void ASYNC_sigio(int a);
 189
 190
 191 /**********************************************************************
 192  *              SIGNAL_MaskAsyncEvents
 193  */
 194 void SIGNAL_MaskAsyncEvents( BOOL flag )
 195 {
 196   sigprocmask( (flag) ? SIG_BLOCK : SIG_UNBLOCK , &async_signal_set, NULL);
 197 }
 198
 199 extern void SIGNAL_SetHandler( int sig, void (*func)(), int flags );
 200
 201 /**********************************************************************
 202  *              SIGNAL_break
 203  *
 204  * Handle Ctrl-C and such
 205  */
 206 static HANDLER_DEF(SIGNAL_break)
 207 {
 208     HANDLER_INIT();
 209     if (Options.debug && fnWINE_Debugger)
 210         fnWINE_Debugger( signal, HANDLER_CONTEXT );  /* Enter our debugger */
 211     else exit(0);
 212 }
 213
 214
 215 /**********************************************************************
 216  *              SIGNAL_trap
 217  *
 218  * SIGTRAP handler.
 219  */
 220 static HANDLER_DEF(SIGNAL_trap)
 221 {
 222     HANDLER_INIT();
 223     if (fnWINE_Debugger)
 224         fnWINE_Debugger( signal, HANDLER_CONTEXT );  /* Enter our debugger */
 225 }
 226
 227
 228 /**********************************************************************
 229  *              SIGNAL_fault
 230  *
 231  * Segfault handler.
 232  */
 233 static HANDLER_DEF(SIGNAL_fault)
 234 {
 235     const char *fault = "Segmentation fault";
 236     HANDLER_INIT();
 237
 238 #ifdef __i386__
 239
 240 #if defined(TRAP_sig) && defined(CR2_sig)
 241     if (TRAP_sig(HANDLER_CONTEXT) == 0x0e
 242         && VIRTUAL_HandleFault( (LPVOID)CR2_sig(HANDLER_CONTEXT) ))
 243         return;
 244 #endif
 245
 246     if (fnINSTR_EmulateInstruction &&
 247         fnINSTR_EmulateInstruction( HANDLER_CONTEXT )
 248     )
 249         return;
 250
 251 #ifdef TRAP_sig
 252     if (TRAP_sig( HANDLER_CONTEXT ) < NB_TRAPS)
 253         fault = SIGNAL_traps[TRAP_sig( HANDLER_CONTEXT )];
 254 #endif
 255     if (IS_SELECTOR_SYSTEM(CS_sig(HANDLER_CONTEXT)))
 256     {
 257         MSG("%s in 32-bit code (0x%08lx).\n", fault, EIP_sig(HANDLER_CONTEXT));
 258     }
 259     else
 260     {
 261         MSG("%s in 16-bit code (%04x:%04lx).\n", fault,
 262             (WORD)CS_sig(HANDLER_CONTEXT), EIP_sig(HANDLER_CONTEXT) );
 263     }
 264 #ifdef CR2_sig
 265     MSG("Fault address is 0x%08lx\n",CR2_sig(HANDLER_CONTEXT));
 266 #endif
 267 #endif
 268
 269     if (fnWINE_Debugger)
 270         fnWINE_Debugger( signal, HANDLER_CONTEXT );
 271 }
 272
 273
 274 /**********************************************************************
 275  *              SIGNAL_InitHandlers
 276  */
 277 void SIGNAL_InitHandlers(void)
 278 {
 279     SIGNAL_SetHandler( SIGINT,  (void (*)())SIGNAL_break, 1);
 280     SIGNAL_SetHandler( SIGSEGV, (void (*)())SIGNAL_fault, 1);
 281     SIGNAL_SetHandler( SIGILL,  (void (*)())SIGNAL_fault, 1);
 282     SIGNAL_SetHandler( SIGFPE,  (void (*)())SIGNAL_fault, 1);
 283     SIGNAL_SetHandler( SIGTRAP, (void (*)())SIGNAL_trap,  1); /* debugger */
 284     SIGNAL_SetHandler( SIGHUP,  (void (*)())SIGNAL_trap,  1); /* forced break*/
 285 #ifdef SIGBUS
 286     SIGNAL_SetHandler( SIGBUS,  (void (*)())SIGNAL_fault, 1);
 287 #endif
 288     return;
 289 }
 290
 291 /**********************************************************************
 292  *              SIGNAL_Init
 293  */
 294 BOOL SIGNAL_Init(void)
 295 {
 296 #ifdef HAVE_WORKING_SIGALTSTACK
 297     struct sigaltstack ss;
 298     ss.ss_sp    = SIGNAL_Stack;
 299     ss.ss_size  = sizeof(SIGNAL_Stack);
 300     ss.ss_flags = 0;
 301     if (sigaltstack(&ss, NULL) < 0)
 302     {
 303         perror("sigstack");
 304         return FALSE;
 305     }
 306 #endif  /* HAVE_SIGALTSTACK */
 307
 308     sigemptyset(&async_signal_set);
 309
 310     SIGNAL_SetHandler( SIGCHLD, (void (*)())SIGNAL_child, 1);
 311 #ifdef CONFIG_IPC
 312     sigaddset(&async_signal_set, SIGUSR2);
 313     SIGNAL_SetHandler( SIGUSR2, (void (*)())stop_wait, 1);      /* For IPC */
 314 #endif
 315 #ifdef SIGIO
 316     sigaddset(&async_signal_set, SIGIO);
 317 /*    SIGNAL_SetHandler( SIGIO,   (void (*)())WINSOCK_sigio, 0);  */
 318     SIGNAL_SetHandler( SIGIO,   (void (*)())ASYNC_sigio, 0);
 319 #endif
 320     sigaddset(&async_signal_set, SIGALRM);
 321
 322     /* ignore SIGPIPE so that WINSOCK can get a EPIPE error instead  */
 323     signal (SIGPIPE, SIG_IGN);
 324     SIGNAL_InitHandlers();
 325     return TRUE;
 326 }