loader/signal.c

   1 #ifndef WINELIB
   2 #include <stdio.h>
   3 #include <stdlib.h>
   4 #include <signal.h>
   5 #include <string.h>
   6 #include <errno.h>
   7 #include <time.h>
   8 #include <setjmp.h>
   9
  10 #if defined(__NetBSD__) || defined(__FreeBSD__)
  11 #include <sys/syscall.h>
  12 #include <sys/param.h>
  13 #else
  14 #include <syscall.h>
  15 #endif
  16
  17 #include "wine.h"
  18 #include "dos_fs.h"
  19 #include "prototypes.h"
  20 #include "miscemu.h"
  21 #include "registers.h"
  22 #include "win.h"
  23
  24 #if !defined(BSD4_4) || defined(linux) || defined(__FreeBSD__)
  25 char * cstack[4096];
  26 #endif
  27 struct sigaction segv_act;
  28
  29 #ifdef linux
  30 extern void ___sig_restore();
  31 extern void ___masksig_restore();
  32
  33 /* Similar to the sigaction function in libc, except it leaves alone the
  34    restorer field */
  35
  36 static int
  37 wine_sigaction(int sig,struct sigaction * new, struct sigaction * old)
  38 {
  39         __asm__("int $0x80":"=a" (sig)
  40                 :"0" (SYS_sigaction),"b" (sig),"c" (new),"d" (old));
  41         if (sig>=0)
  42                 return 0;
  43         errno = -sig;
  44         return -1;
  45 }
  46 #endif
  47
  48 int do_int(int intnum, struct sigcontext_struct *context)
  49 {
  50         switch(intnum)
  51         {
  52               case 0x10: return do_int10(context);
  53
  54               case 0x11:
  55                 AX = DOS_GetEquipment();
  56                 return 1;
  57
  58               case 0x12:
  59                 AX = 640;
  60                 return 1;       /* get base mem size */
  61
  62               case 0x13: return do_int13(context);
  63               case 0x15: return do_int15(context);
  64               case 0x16: return do_int16(context);
  65               case 0x1a: return do_int1a(context);
  66               case 0x21: return do_int21(context);
  67
  68               case 0x22:
  69                 AX = 0x1234;
  70                 BX = 0x5678;
  71                 CX = 0x9abc;
  72                 DX = 0xdef0;
  73                 return 1;
  74
  75               case 0x25: return do_int25(context);
  76               case 0x26: return do_int26(context);
  77               case 0x2a: return do_int2a(context);
  78               case 0x2f: return do_int2f(context);
  79               case 0x31: return do_int31(context);
  80               case 0x5c: return do_int5c(context);
  81
  82               default:
  83                 fprintf(stderr,"int%02x: Unimplemented!\n", intnum);
  84                 break;
  85         }
  86         return 0;
  87 }
  88
  89 #ifdef linux
  90 static void win_fault(int signal, struct sigcontext_struct context_struct)
  91 {
  92     struct sigcontext_struct *context = &context_struct;
  93 #else
  94 static void win_fault(int signal, int code, struct sigcontext *context)
  95 {
  96 #endif
  97     unsigned char * instr;
  98     WORD *stack;
  99 #if !(defined (linux) || defined (__NetBSD__))
 100     int i, *dump;
 101 #endif
 102
 103         /* First take care of a few preliminaries */
 104 #ifdef linux
 105     if(signal != SIGSEGV
 106        && signal != SIGILL
 107        && signal != SIGFPE
 108 #ifdef SIGBUS
 109        && signal != SIGBUS
 110 #endif
 111        && signal != SIGTRAP)
 112     {
 113         exit(1);
 114     }
 115
 116     /* And back up over the int3 instruction. */
 117     if(signal == SIGTRAP) {
 118       EIP--;
 119       goto oops;
 120     }
 121 #endif
 122 #ifdef __NetBSD__
 123 /*         set_es(0x1f); set_ds(0x1f); */
 124     if(signal != SIGBUS && signal != SIGSEGV && signal != SIGTRAP)
 125         exit(1);
 126 #endif
 127 #ifdef __FreeBSD__
 128 /*         set_es(0x27); set_ds(0x27); */
 129     if(signal != SIGBUS && signal != SIGSEGV && signal != SIGTRAP)
 130         exit(1);
 131 #endif
 132     if (CS == WINE_CODE_SELECTOR)
 133     {
 134         fprintf(stderr,
 135                 "Segmentation fault in Wine program (%x:%lx)."
 136                 "  Please debug\n", CS, EIP );
 137         goto oops;
 138     }
 139
 140     /*  Now take a look at the actual instruction where the program
 141         bombed */
 142     instr = (unsigned char *) PTR_SEG_OFF_TO_LIN( CS, EIP );
 143
 144     switch(*instr)
 145     {
 146       case 0xcd: /* int <XX> */
 147             instr++;
 148             if (!do_int(*instr, context)) {
 149                 fprintf(stderr,"Unexpected Windows interrupt %x\n", *instr);
 150                 goto oops;
 151             }
 152             EIP += 2;  /* Bypass the int instruction */
 153             break;
 154
 155       case 0xcf: /* iret */
 156             stack = (WORD *)PTR_SEG_OFF_TO_LIN( SS, SP );
 157             EIP = *stack++;
 158             CS  = *stack++;
 159             EFL = *stack;
 160             SP += 6;  /* Pop the return address and flags */
 161             break;
 162
 163       case 0xe4: /* inb al,XX */
 164             inportb_abs(context);
 165             EIP += 2;
 166             break;
 167
 168       case 0xe5: /* in ax,XX */
 169             inport_abs(context);
 170             EIP += 2;
 171             break;
 172
 173       case 0xe6: /* outb XX,al */
 174             outportb_abs(context);
 175             EIP += 2;
 176             break;
 177
 178       case 0xe7: /* out XX,ax */
 179             outport_abs(context);
 180             EIP += 2;
 181             break;
 182
 183       case 0xec: /* inb al,dx */
 184             inportb(context);
 185             EIP++;
 186             break;
 187
 188       case 0xed: /* in ax,dx */
 189             inport(context);
 190             EIP++;
 191             break;
 192
 193       case 0xee: /* outb dx,al */
 194             outportb(context);
 195             EIP++;
 196             break;
 197
 198       case 0xef: /* out dx,ax */
 199             outport(context);
 200             EIP++;
 201             break;
 202
 203       case 0xfa: /* cli, ignored */
 204             EIP++;
 205             break;
 206
 207       case 0xfb: /* sti, ignored */
 208             EIP++;
 209             break;
 210
 211       default:
 212                 fprintf(stderr, "Unexpected Windows program segfault"
 213                         " - opcode = %x\n", *instr);
 214                 goto oops;
 215     }
 216
 217     /* OK, done handling the interrupt */
 218
 219     return;
 220
 221   oops:
 222     XUngrabPointer(display, CurrentTime);
 223     XUngrabServer(display);
 224     XFlush(display);
 225     fprintf(stderr,"In win_fault %x:%lx\n", CS, EIP );
 226 #if defined(linux) || defined(__NetBSD__) || defined(__FreeBSD__)
 227     wine_debug(signal, (int *)context);  /* Enter our debugger */
 228 #else
 229     fprintf(stderr,"Stack: %x:%x\n", SS, ESP );
 230     dump = (int*) context;
 231     for(i=0; i<22; i++)
 232     {
 233         fprintf(stderr," %8.8x", *dump++);
 234         if ((i % 8) == 7)
 235             fprintf(stderr,"\n");
 236     }
 237     fprintf(stderr,"\n");
 238     exit(1);
 239 #endif
 240 }
 241
 242 void init_wine_signals(void)
 243 {
 244 #ifdef linux
 245         segv_act.sa_handler = (__sighandler_t) win_fault;
 246         /* Point to the top of the stack, minus 4 just in case, and make
 247            it aligned  */
 248         segv_act.sa_restorer =
 249                 (void (*)()) (((unsigned int)(cstack) + sizeof(cstack) - 4) & ~3);
 250         wine_sigaction(SIGSEGV, &segv_act, NULL);
 251         wine_sigaction(SIGILL, &segv_act, NULL);
 252         wine_sigaction(SIGFPE, &segv_act, NULL);
 253 #ifdef SIGBUS
 254         wine_sigaction(SIGBUS, &segv_act, NULL);
 255 #endif
 256         wine_sigaction(SIGTRAP, &segv_act, NULL); /* For breakpoints */
 257 #endif
 258 #if defined(__NetBSD__) || defined(__FreeBSD__)
 259         sigset_t sig_mask;
 260         struct sigaltstack ss;
 261
 262 #if !defined (__FreeBSD__)
 263         if ((ss.ss_base = malloc(MINSIGSTKSZ)) == NULL) {
 264 #else
 265         if ((ss.ss_sp = malloc(MINSIGSTKSZ)) == NULL) {
 266 #endif
 267                 fprintf(stderr, "Unable to allocate signal stack (%d bytes)\n",
 268                         MINSIGSTKSZ);
 269                 exit(1);
 270         }
 271         ss.ss_size = MINSIGSTKSZ;
 272         ss.ss_flags = 0;
 273         if (sigaltstack(&ss, NULL) < 0) {
 274                 perror("sigstack");
 275                 exit(1);
 276         }
 277         sigemptyset(&sig_mask);
 278         segv_act.sa_handler = (void (*)) win_fault;
 279         segv_act.sa_flags = SA_ONSTACK;
 280         segv_act.sa_mask = sig_mask;
 281         if (sigaction(SIGBUS, &segv_act, NULL) < 0) {
 282                 perror("sigaction: SIGBUS");
 283                 exit(1);
 284         }
 285         segv_act.sa_handler = (void (*)) win_fault;
 286         segv_act.sa_flags = SA_ONSTACK;
 287         segv_act.sa_mask = sig_mask;
 288         if (sigaction(SIGSEGV, &segv_act, NULL) < 0) {
 289                 perror("sigaction: SIGSEGV");
 290                 exit(1);
 291         }
 292         segv_act.sa_handler = (void (*)) win_fault; /* For breakpoints */
 293         segv_act.sa_flags = SA_ONSTACK;
 294         segv_act.sa_mask = sig_mask;
 295         if (sigaction(SIGTRAP, &segv_act, NULL) < 0) {
 296                 perror("sigaction: SIGTRAP");
 297                 exit(1);
 298         }
 299 #endif
 300 }
 301
 302 #endif /* ifndef WINELIB */