217 lines
4.6 KiB
C
217 lines
4.6 KiB
C
#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <syscall.h>
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#include <signal.h>
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#include <errno.h>
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#include <linux/sched.h>
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#include <asm/system.h>
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extern void ___sig_restore();
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extern void ___masksig_restore();
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/* Similar to the sigaction function in libc, except it leaves alone the
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restorer field */
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static int
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wine_sigaction(int sig,struct sigaction * new, struct sigaction * old)
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{
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__asm__("int $0x80":"=a" (sig)
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:"0" (SYS_sigaction),"b" (sig),"c" (new),"d" (old));
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if (sig>=0)
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return 0;
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errno = -sig;
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return -1;
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}
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char * cstack[4096];
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struct sigaction segv_act;
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struct sigcontext_struct {
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unsigned short gs, __gsh;
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unsigned short fs, __fsh;
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unsigned short es, __esh;
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unsigned short ds, __dsh;
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unsigned long edi;
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unsigned long esi;
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unsigned long ebp;
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unsigned long esp;
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unsigned long ebx;
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unsigned long edx;
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unsigned long ecx;
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unsigned long eax;
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unsigned long trapno;
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unsigned long err;
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unsigned long eip;
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unsigned short cs, __csh;
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unsigned long eflags;
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unsigned long esp_at_signal;
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unsigned short ss, __ssh;
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unsigned long i387;
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unsigned long oldmask;
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unsigned long cr2;
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};
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static void
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GetTimeDate(int time_flag, struct sigcontext_struct * context)
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{
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struct tm *now;
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time_t ltime;
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ltime = time(NULL);
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now = localtime(<ime);
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if (time_flag)
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{
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context->ecx = (now->tm_hour << 8) | now->tm_min;
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context->edx = now->tm_sec << 8;
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}
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else
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{
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context->ecx = now->tm_year + 1900;
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context->edx = ((now->tm_mon + 1) << 8) | now->tm_mday;
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context->eax &= 0xff00;
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context->eax |= now->tm_wday;
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}
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}
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/* We handle all int21 calls here. There is some duplicate code from
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misc/dos.c that I am unsure how to deal with, since the locations
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that we store the registers are all different */
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static int
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do_int21(struct sigcontext_struct * context){
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fprintf(stderr,"Doing int21 %x ", (context->eax >> 8) & 0xff);
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switch((context->eax >> 8) & 0xff){
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case 0x30:
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context->eax = 0x0303; /* Hey folks, this is DOS V3.3! */
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context->ebx = 0;
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context->ecx = 0;
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break;
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/* Ignore any attempt to set a segment vector */
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case 0x25:
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return 1;
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case 0x35: /* Return a NULL segment selector - this will bomb
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if anyone ever tries to use it */
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context->es = 0;
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context->ebx = 0;
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break;
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case 0x2a:
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GetTimeDate(0, context);
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/* Function does not return */
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case 0x2c:
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GetTimeDate(1, context);
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/* Function does not return */
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case 0x4c:
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exit(context->eax & 0xff);
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default:
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fprintf(stderr,"Unable to handle int 0x21 %x\n", context->eax);
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return 1;
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};
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return 1;
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}
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static int
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do_int1A(struct sigcontext_struct * context){
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time_t ltime;
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int ticks;
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switch((context->eax >> 8) & 0xff){
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case 0:
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ltime = time(NULL);
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ticks = (int) (ltime * HZ);
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context->ecx = ticks >> 16;
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context->edx = ticks & 0x0000FFFF;
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context->eax = 0; /* No midnight rollover */
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break;
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default:
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fprintf(stderr,"Unable to handle int 0x1A %x\n", context->eax);
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return 1;
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};
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return 1;
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}
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static void win_segfault(int signal, struct sigcontext_struct context){
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unsigned char * instr;
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unsigned char intno;
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unsigned int * dump;
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int i;
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/* First take care of a few preliminaries */
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if(signal != SIGSEGV) exit(1);
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if((context.cs & 7) != 7){
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fprintf(stderr,
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"Segmentation fault in Wine program (%x:%x)."
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" Please debug\n",
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context.cs, context.eip);
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goto oops;
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};
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/* Now take a look at the actual instruction where the program
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bombed */
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instr = (char *) ((context.cs << 16) | (context.eip & 0xffff));
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if(*instr != 0xcd) {
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fprintf(stderr,
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"Unexpected Windows program segfault"
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" - opcode = %x\n", *instr);
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#if 0
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return;
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#else
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goto oops;
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#endif
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};
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instr++;
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intno = *instr;
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switch(intno){
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case 0x21:
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if(!do_int21(&context)) goto oops;
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break;
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case 0x1A:
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if(!do_int1A(&context)) goto oops;
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break;
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default:
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fprintf(stderr,"Unexpected Windows interrupt %x\n", intno);
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goto oops;
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};
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/* OK, done handling the interrupt */
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context.eip += 2; /* Bypass the int instruction */
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return;
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oops:
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fprintf(stderr,"In win_segfault %x:%x\n", context.cs, context.eip);
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fprintf(stderr,"Stack: %x:%x\n", context.ss, context.esp_at_signal);
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dump = (int*) &context;
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for(i=0; i<22; i++)
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{
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fprintf(stderr," %8.8x", *dump++);
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if ((i % 8) == 7)
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fprintf(stderr,"\n");
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}
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fprintf(stderr,"\n");
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exit(1);
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}
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int
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init_wine_signals(){
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segv_act.sa_handler = (__sighandler_t) win_segfault;
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/* Point to the top of the stack, minus 4 just in case, and make
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it aligned */
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segv_act.sa_restorer =
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(void (*)()) (((unsigned int)(cstack + sizeof(cstack) - 4)) & ~3);
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wine_sigaction(SIGSEGV, &segv_act, NULL);
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}
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